What are the main points of maintenance, adjustment and design of cantilever cranes?

 Regarding cantilever cranes, everyone may be a little unfamiliar. Cantilever Crane factory operators must strictly abide by the operating rules before they can operate the cantilever crane independently, and should follow the safety rules. Here is a brief introduction to the main points of maintenance, adjustment and design of cantilever cranes.

1. Maintenance and adjustment of cantilever crane:

1. Inspection and adjustment of metal structure In order to ensure the normal use of cantilever cranes and extend the service life of parts, components and cantilever cranes, end beam cantilever cranes must be checked and adjusted frequently.

The inspection content of the metal structure and the judgment standard The metal structure of the cantilever crane is inspected 1 to 2 times a year, focusing on the loosening and falling of connecting bolts and nuts, cracks and cracks in structural materials and welds, bridge deformation, corrosion of structural parts, etc. content.

For the inspection items and contents of the cantilever crane and trolley operating mechanism, refer to the motor operation and maintenance manual and the hoist operation and maintenance manual.

2. Maintenance of electrical equipment Regular maintenance and frequent inspections are important measures for the maintenance of electrical equipment and should be done in accordance with regulations.

When electrical equipment fails, the cause of the failure should be analyzed first, so as to accurately find out the electrical components that have failed.

2. Key points of cantilever crane design:

1. The jog performance of the cantilever crane is better, and the stable speed of the single rope is not more than 2m/min;

2. The main luffing force must be limited, and a force sensor can be installed on the luffing rope or the main luffing tension plate;

3. The super lift device with vertical oil cylinder needs to be equipped with a pressure sensor to detect whether the force on both sides of the pull plate is balanced, and display the force of the two on the display screen, the user can choose to operate the two cylinders synchronously or adjust separately;

4. Overlifting the mast needs to install an angle sensor, and use its value to calculate the amplitude of overlifting the mast;

5. If the horizontal cylinder type is capable of stepless luffing, it needs to be equipped with a length sensor, otherwise the positioning pin can be used in a certain range to ensure the range of the overlifting counterweight.

The above is a brief introduction about "Maintenance, adjustment and design of cantilever cranes?"

What are the main points of maintenance, adjustment and design of cantilever cranes?

What Are The Types Of Cranes And The Factors That Cause Instability?

 Everyone is not unfamiliar with cranes. A crane is an organization used to complete the straight lifting of materials. It is the most important and fundamental organization of any crane gantry crane. Here is a brief introduction to the types of cranes and the factors that lead to instability.

Everyone is not unfamiliar with cranes. A crane is an organization used to complete the straight lifting of materials. It is the most important and fundamental organization of any crane gantry crane. Here is a brief introduction to the types of cranes and the factors that lead to instability.

1. Types of cranes:

　　 1. Light lifting equipment

　　 Electric hoist, hand chain hoist, electric chain hoist, emblem type hoist, etc., with light and compact structure, light weight, small size, and strong versatility of parts.

　　 Bridge crane: It is the most commonly used. It is erected on the track of the fixed strut between the buildings and used in workshops, warehouses, etc. Do loading, unloading, lifting and handling work indoors or in the open air. In the factory, it is generally referred to as a driving vehicle.

　　 (1). Divided by structure: such as single-beam bridge, double-beam bridge, multi-beam bridge, double trolley bridge, multiple trolley bridge, etc.

　　 (2). According to the picking device: such as hook bridge crane, grab bridge crane, electromagnetic bridge crane, container bridge crane, etc.

　　 (3). Divided by purpose: such as general-purpose bridge cranes, metallurgical bridge cranes, explosion-proof bridge cranes and so on.

　　2. Gantry crane

　　Gantry crane is a kind of bridge crane, also called Longchuan crane. Mainly used for outdoor cargo yard, stock yard cargo, bulk cargo loading and unloading operations. Its metal structure is like a door-shaped frame. Two supporting legs are installed under the main beam to walk directly on the track on the ground. Both ends of the main beam can be provided with outhanging cantilever beams.

　　 (1). According to the structure: single main beam gantry crane, double main beam gantry crane, box or truss gantry crane

　　 (2). Divided by cantilever: single cantilever gantry crane, double cantilever, non-cantilever gantry crane, etc.

　　 (3). According to the support mode: rail-mounted gantry crane, tire-type gantry crane.

　　 (4). According to the picking device: hook gantry crane, grab gantry crane, electromagnetic gantry crane, etc.

　　 (5). According to the occasion of use: general gantry cranes, shipbuilding gantry cranes, hydropower station gantry cranes, etc.

　　 (6). According to the lifting trolley: self-propelled trolley gantry crane, traction trolley gantry crane, chain hoist gantry crane, etc.

　　3. Boom type crane

　　(1). Operating boom-type rotating cranes, including: portal cranes, floating cranes, tower cranes, automobile and tire cranes, crawler cranes, and railway cranes.

　　 (2), fixed jib cranes, including: cantilever cranes, mast cranes, and jib cranes.

Everyone is not unfamiliar with cranes. A crane is an organization used to complete the straight lifting of materials. It is the most important and fundamental organization of any crane gantry crane. Here is a brief introduction to the types of cranes and the factors that lead to instability.

2. Factors leading to instability of hoisting machinery:

1. Crane instability

Main factors: overload, unstable outriggers, mechanical failure, excessive mast pain, etc.

Solution: prohibit overloading, strict mechanical inspection, lay the outriggers and fix them with road wood and steel plate to keep the outriggers stable.

2. The instability of the hoisting system

Main factors: unsynchronized multi-machine hoisting; improper load distribution of multi-machine hoisting with different lifting capabilities; multi-action, multi-position command and harmonious error, mast system wind rope and ground anchor instability.

Solution: When multi-machine hoisting, try to choose cranes of the same model and the same or similar hoisting capabilities, and complete the synchronization of multi-machine hoisting through the main and deputy commanders; cluster jacks or winches are controlled by the computer to complete the synchronization of multiple hoisting points; Good command and operating procedures and drills, try to be consistent; wind ropes and ground anchors are set up strictly in accordance with the hoisting plan and technical calculations. After the settings are completed, check and record them.

3. Instability of hoisting equipment or components

Main factors: because of the different forces during planning and hoisting, the rigidity of the equipment or components is too small.

Solution: Choose multiple lifting points for slender, large-area equipment or components; fix or increase the cross-section of the thin parts or rods of section steel components and grid structures.

What Are The Types Of Cranes And The Factors That Cause Instability?

 Explosion-proof electric chain hoist, as a kind of electric chain hoist, actually has many advantages. Understanding its advantages can help us choose the right electric hoist.

1. The standard electric chain hoist is 40% ED to meet almost all lifting industrial applications. The electric hoist comes with automatic overload and under-load protection. The use of a limited switch can eliminate the damage caused by overload and under-load to the hoist. Safety.
2. Explosion-proof electric chain hoist button control handle, the button control is rainproof and responsive.
3. Explosion-proof electric chain hoist anti-wear load sheaves The load sheaves are made of alloy steel and have undergone professional heat treatment to resist wear and smoothly fit the chain. The new chain design guidelines provide guidance for smoothly embedding the chain into the pulley.
4. The operating handle of the electric hoist is low voltage. The operating handle voltage of the standard electric chain hoist is 24V-36V low voltage control. The low voltage can effectively protect the operator from electric shock.
5. The compact structure design of the explosion-proof electric chain hoist can reach a relatively large possible lifting height.
6. The working mode of explosion-proof electric chain hoist is divided into single-speed or double-speed hoisting, hanging hook or running trolley with manual or electric, two-way or multi-directional operation.
7. Explosion-proof electric hoist overload protection adds an overload protection device for extra safety. This is a special protection device for the operator, electric chain hoist and load.
8. Explosion-proof electric chain hoist lifting chain, nickel-hardened chain has been specially treated by MODE, which will not affect the initial chain performance. It has excellent performance and can resist rust caused by rainwater, seawater, stream water and chemical substances.

From this, we can understand the application of explosion-proof electric hoist in various aspects. It is widely used and can greatly improve work efficiency. Nowadays, electric chain hoist has been used in all aspects of our life and industry.

Advantages of Explosion-proof Electric Chain Hoist

How to prevent the electric chain hoist from malfunctioning during operation?

 As a popular light and small lifting equipment, electric chain hoist has been active in logistics, construction, mining, nuclear energy and other fields. With more and more users of electric chain hoists, many problems have been found in the use of electric chain hoists. For the normal operation of electric chain hoist, here is how to avoid failures.

For the electric chain hoist can operate normally, in addition to the requirements for the surrounding use environment, we need to check the electric chain hoist before lifting. There is such a prerequisite to ensure the normal operation of the electric chain hoist without errors. malfunction.

• Before operating the electric chain hoist, check whether the mechanical parts are damaged.
• Whether the electric hoist hoisting heavy objects is connected with other objects.
• Lifting heavy objects must not exceed the rated load of the hoist.
• The voltage needs to be stable and cannot be lower than or exceed the rated voltage.
• The greater the tonnage of the electric chain hoist, the greater the number of chain rows. The lower hook of the lifting chain must not be turned over in the chain.

Electric hoist is a widely used small lifting equipment. Safety in use is very important. Do a good job of inspection before use, precautions during use and daily maintenance work to avoid errors in the operation of the electric hoist and delay its service life. Of course, in addition to the basic work of inspection before use, the normal operation of the electric hoist can be guaranteed, as well as standard behavior in use, maintenance and storage after use.

How to prevent the electric chain hoist from malfunctioning during operation?

SINGLE GIRDER ELECTRIC HOIST CRANE| ELECTRIC HOIST CRANE – OVERHEAD CRANE OF DONGQI

 

Single Girder Electric Hoist Crane

Single girder electric hoist crane introduction

The single girder electric hoist crane is the most cost-effective electric hoist crane developed by Dongqi Crane. The single girder electric hoist crane is a light and small overhead crane, equipeed with electric hoists as the lifting mechanism. The lifting capacity of the single girder electric hoist crane is 1 ton to 32 tons and the working class is A3 and A4. The main parameter of the single girder electric hoist crane is as follow:

Single Girder Electric hoist Crane Product Type	LD
Single Girder Electric hoist Crane Lifting Capacity	1~32t
Single Girder Electric hoist Crane Span Length	7.5~28.5m
Single Girder Electric hoist Crane Working Class	A3,A4
Single Girder Electric hoist Crane Ambient Temperature	-20~40℃

Application of single girder electric hoist crane

The single girder electric hoist crane is used to lift loads in the various environment, such, as, factory, ware house, stockyard, etc. However, the electric hoist cranes are banned to be used in some dangerous environment, such as, combustible environment and explosive environment, etc.

Single girder electric hoist crane sample drawing

Advantages of single girder electric hoist crane

• The electric hoist crane is designed well and has strong rigidity.
• The electric hoist crane has good suability and strong commonality and is convenient in use.
• The steady travelling speed adjusting function is installed on the single girder electric hoist crane.
• Various types of electric hoists can be used on the overhead crane.
• Customized single girder electric hoist cranes are available.

Features of single girder electric hoist crane

On single girder of electric hoist crane

• The electric hoist crane is made by high quality I steel and high quality u-shaped slot into composition. End girder of the single girder electric hoist crane is welded with rectangular tubes or good steel.
• The girder of the electric hoist crane can be assembled and adjusted easily and rapidly.
• Compact structure of the single girder electric hoist crane is small and light.
• The single girder electric hoist crane use specially made wheels which are light and widely used.
• Smoothly moving, effectively braking, long service life,

On electric parts of electric hoist crane

• Electric hoist and overhead crane are controlled separately which enable them move together and separately.
• Flat cable or special cable power supply for electric hoist
• Galvanize slide and cable small trolley
• Smoothly moving, overall aesthetics
• Set electric taxi speed is high, ensure continuing power supply,
• Operation, hoisting, the point start special smoothly,
• Users can choose according to different needs

On safety device of electric hoist crane

• Anti-collision, sound and light alarm devices are used to ensure the safety of electric hoist crane.
• The electric hoist cane uses circuit self-check protector
• Flow phase lack protection are installed on the overhead crane.
• And various types of safety measures are installed on the single girder electric hoist crane according to regulations.

On operation devices of electric hoist crane

• Ground control and cabin control are available for the single girder electric hoist crane.
• The cable have open style and close style, can fixed on left or right of the electric hoist crane.
• The open direction include end open, side open or top open
• The cabin of the electric hoist crane has special small room and the capsule cabin.
• Ground control has handle and remote control, do not need to set up special driver
• Users can choose as you need. Customized operation control are available for the electric hoist crane.

SINGLE GIRDER ELECTRIC HOIST CRANE| ELECTRIC HOIST CRANE – OVERHEAD CRANE OF DONGQI

10 ton overhead crane for mail machine project in Ethiopia

 On 14^th September, the Ethiopia clients Mr Ashenafi visited we Dongqi Group, for checking our company strength and plan to purchase 6sets 10Tons double girder overhead crane, used in pipe-maling machine factory.

The Pipe-Making Machine Project introduction

Since 2014, Ethiopia economy has been developing rapidly, the government support lots industries establish their new workshops, so Mr Ashenafi established a new pipe-maling machine factory in Addis Ababa. Mr Ashenafi has been contacting with our sales manager Mr. Oscar Li since beginning of January,2016. To proceed the project, he come to decide the overhead crane solutions and make the deal.

Overhead crane for reference

Make the 10 Tons overhead crane solution

According to Mr Ashenafi workshop situation, crane lifting goods, working time per day, our engineer designed the 10 Tons double girder overhead crane, the span 24 meters, lift height 9 meters, 380V, 50Hz, 3P, he was very satisfied with the solution.

Pipe-making overhead crane solution

Visiting workshop process

Firstly, Mr. Ashenafi visiting spare parts workshop, Mr. Oscar introduced that all these workshop crane parts(such as hooks, wheels, pulley, drums etc.) manufactured by Dongqi Group, if so, we could control the whole production process and ensure the spare parts quality; besides, Dongqi Group could adjust worker’s working time to meet customers delivery time.

Then Mr. Ashenafi visited the girders, hoist, trolley manufacturing workshops and finished crane workshop. When Mr. Ashenafi saw one 200 Tons gantry crane is manufacturing, he felt very amazing about that, actually our maximum capacity is 800 tons.

Client visit us for overhead crane

Finished the order at the meeting room

After visited the workshops, Mr. Ashenafi talked about the Mr. Oscar of 10 Tons double girder overhead crane delivery time, package, quality test etc., Mr. Oscar answered all questions clearly, the customer was very satisfied with Dongqi Group and the solutions, at last, Mr. Ashenafi signed contract with Dongqi Group, the total amount is USD143,000.00.

Contact us to get more information on the double girder overhead crane now.

10 ton overhead crane for mail machine project in Ethiopia

10 Ton Single Girder Crane Price for Sale

 10 Ton Single Girder Crane Price is $5,000 and above.

10 Ton single girder crane price only includes the single girder crane equipment. Please also provide the single girder crane specific span, lifting height, and fill in below. 10 Ton single girder crane power cable and track, as well as the transportation and installation plan, which need you to provide the 10 Ton single girder crane use location, operation environment and run length in the following table, we will immediately give you detailed solution and price offer for free.

10 Ton Single girder crane price for sale is cheap; hoisting mechanism adopts single speed and double speed electric wire rope hoist, which is light and small overhead crane. 10 Ton single girder crane with strong rigidity, simple and practical structure, safe and reliable operation, working class A4, applicable to general strength working environment.

About 10 Ton Single Girder Crane Price for Sale

Crane manufacturers Dongqi Group mainly supply overhead cranes, gantry cranes, eot cranes, bridge cranes, electric hoists, crane parts and related industrial cranes in China.

10 Ton Single Girder Crane Price for Sale

3 Ton Single Girder Crane Price for Sale

 3 Ton Single Girder Crane Price is $3,500 and above.

3 Ton single girder crane price only includes the single girder crane equipment. Please also provide the single girder crane specific span, lifting height, and fill in below. 3 Ton single girder crane power cable and track, as well as the transportation and installation plan, which need you to provide the 3 Ton single girder crane use location, operation environment and run length in the following table, we will immediately give you detailed solution and price offer for free.

3 Ton single girder crane price for sale is cheap; hoisting mechanism adopts single speed and double speed electric wire rope hoist, which is light and small overhead crane. 3 Ton single girder crane with strong rigidity, simple and practical structure, safe and reliable operation, working class A4, applicable to general strength working environment.

About 3 Ton Single Girder Crane Price for Sale

Crane manufacturers Dongqi Group mainly supply overhead cranes, gantry cranes, eot cranes, bridge cranes, electric hoists, crane parts and related industrial cranes in China.

3 Ton Single Girder Crane Price for Sale

2 Ton Single Girder Crane Price for Sale

 2 Ton Single Girder Crane Price is $3,100 and above.

2 Ton single girder crane price only includes the single girder crane equipment. Please also provide the single girder crane specific span, lifting height, and fill in below. 2 Ton single girder crane power cable and track, as well as the transportation and installation plan, which need you to provide the 2 Ton single girder crane use location, operation environment and run length in the following table, we will immediately give you detailed solution and price offer for free.

2 Ton Single girder crane price for sale is cheap; hoisting mechanism adopts single speed and double speed electric wire rope hoist, which is light and small overhead crane. 2 Ton single girder crane with strong rigidity, simple and practical structure, safe and reliable operation, working class A4, applicable to general strength working environment.

About 2 Ton Single Girder Crane Price for Sale

Crane manufacturers Dongqi Group mainly supply overhead cranes, gantry cranes, eot cranes, bridge cranes, electric hoists, crane parts and related industrial cranes in China.

2 Ton Single Girder Crane Price for Sale

Double Girder Overhead Crane Operation Precautions

 

 Double Girder Overhead Crane introduction

Double girder overhead crane machine with hook is the most basic type of crane machine. It is widely used at machining workshop, storage, etc. The double girder overhead crane is composed of metallic structure, trolley, electrical and movement mechanism. Some special designed Double Girder Crane is used in specialized atmosphere, such as casting workshop, smelting shop, waste yard. There are special lifting tools or material for them.
The double girder overhead crane usually has two working duty: medium and heavy. If not special function and working condition, usually medium working duty is enough for ordinary work.

European style double girder overhead crane

Before Operation:

• To inspect brake, hook, rope and safety device and other parts of the double girder overhead crane, make sure all parts are in right condition and place.
• Before turning on power switch, the overhead crane operator must ensure there is no body on walking plate and rail. Once circuit interrupter is locked and there is warning board, operator should stop to start crane and ask related person to check.
• No load test: Rotate brake wheels of all mechanisms to make drum shaft or wheels spin for one circle, no block phenomena is allowed. Then turn on power, try to start the overhead crane without loading.
• Static load test: It is carried out to test the load-bearing capacity of all parts and metal structure of the double girder overhead crane;
• Dynamic load test of overhead crane: test lifting up and dropping down with rated capacity for several times. And make trolley to travel for 3-5 times, finally stop in middle of span, to check brakes, limiter, electric control and all mechanisms.
• Test and inspect all electric components.

During working:

1． When the double girder overhead crane is used at first time, it must be inspected after lifting 0.5m high, worker should check brake performance, make sure it is reliable, then start work regularly.
2. Alarm should be run with following condition:

• Lifting and dropping, crane and trolley are traveling.
• If crane run far away, being difficult to see, the alarm must ring all the time.
• When one crane travel close to another crane on same rail.
• When lifting object is near to somebody.

3． During operation, all the instruction signal must be unified regulations.
4． If power is cut off suddenly during operation, all control buttons should be set back to Zero. Before re-start crane, inspect all parts in good condition.
5． If you want to change crane / trolley traveling direction when it is traveling well, you must set back to Zero first, then start another direction.
6．If one overhead crane has two hooks, when two hooks are replaced to use, or both lifting height is close, you should operate one hook to avoid two hooks collide.
7．If one crane has two hooks, we don’t allow two hooks to lift two objects at same time. When not work, adjust lifting brake.
8． Don’t allow to stop crane by limiter on limit position. When crane is loading, we can’t adjust lifting brake.
9．Don’t lift once following ten conditions:

• Command signal is unclear or disorderly command
• Overloading
• Lifting tools is not suitable, hanging is not fastness
• On lifting object, there is person or other thing not fastened.
• Any brake can’t work
• Object is being machined
• Hanging is slanting
• Explosive objects
• Buried objects
• Object has angular, block.

10. During working, if any abnormal voice or movement, stop operation immediately, inspect crane.
After working:

• Make hook is on high position; crane and trolley stop on pointed place; controller set back to Zero. Take off protection swatch and power.
• Regular maintenance.
• Correct duty shifting.

Double girder overhead crane precautions to ensure your overhead crane operation safety and efficiency. Dongqi Double girder overhead crane lift you up!

Double Girder Overhead Crane Operation Precautions