A fork truck assembly lifting cylinder anti-collision device and method

Abstract

The application relates to a lifting oil cylinder anti-collision device and method for forklift assembly, the anti-collision device comprises a main counterweight plate (1), mounting seats (101) and connecting seats (102) symmetrically arranged at two ends of the main counterweight plate (1), and a plurality of additional counterweight plates (2) detachably mounted on the main counterweight plate (1); the mounting seat (101) is rotationally provided with a roller (3); the connecting seat (102) is connected with a free end of a chain (4); the total weight of the main counterweight plate (1) and the additional counterweight plates (2) is greater than or equal to the total weight of the chain (4); the anti-collision device comprises a mounting roller, a hoisting counterweight plate, a connecting chain, a mounting additional counterweight plate and an assembly sliding frame. The application can effectively solve the problem of the collision of the chain on the lifting oil cylinder piston rod in the forklift sliding frame assembly process, ensure the assembly quality of the lifting oil cylinder, reduce the investment of human resources and reduce the labor intensity.

Description

Technical Field

[0001] This invention relates to the field of forklift manufacturing and assembly technology, specifically to a collision prevention device and method for a lifting cylinder used in forklift assembly. Background Technology

[0002] Counterbalance forklifts, or simply forklifts, are industrial handling vehicles. They are wheeled handling vehicles used for loading, unloading, stacking, and short-distance transport of palletized goods. They are widely used in ports, railway stations, airports, freight yards, factory workshops, warehouses, distribution centers, and delivery centers. They can also enter ship holds, truck beds, and containers for loading, unloading, and handling of palletized goods. They are indispensable equipment in pallet and container transportation.

[0003] Counterbalance forklifts primarily rely on the extension and retraction of lifting cylinders to raise and lower the inner mast, which in turn uses a chain to drive the sliding frame and forks. For details on assembling the sliding frame on a counterbalance forklift, please refer to... Figure 1 The process involves using a lifting cylinder to raise the inner mast to its top, then hoisting the sliding frame to its assembly position, and finally lowering the inner mast to complete the connection between the sliding frame and the inner mast. During the sliding frame assembly, one end of the chain is connected to the top of the outer mast, while the other end is in a free state. The slack chain can collide with the piston rod of the lifting cylinder during its swinging motion, increasing internal leakage in the hydraulic cylinder and directly affecting the working efficiency and safety of the counterbalance forklift. Therefore, assembling the sliding frame requires multiple operators to work together, manually pulling the chain to prevent it from hitting the piston rod of the lifting cylinder. This presents challenges due to operational difficulties, high labor intensity, and high labor costs.

[0004] Existing technologies mainly focus on protecting the lifting cylinder during forklift operation, but cannot solve the problem of chain oscillation causing impact to the lifting cylinder during forklift assembly. Therefore, there is an urgent need for a device and method to prevent the chain from hitting the lifting cylinder piston rod during forklift steer assembly, in order to protect the lifting cylinder and improve assembly efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a forklift assembly lifting cylinder anti-collision device and method to prevent the chain from hitting the piston rod of the lifting cylinder during the sliding assembly process, thereby protecting the lifting cylinder and improving the working efficiency and safety reliability of the forklift; it eliminates the need for manual chain pulling, is simple and convenient to operate, reduces assembly costs, and improves assembly quality and efficiency.

[0006] The objective of this invention is achieved as follows: A forklift assembly lifting cylinder anti-collision device includes a main counterweight plate, mounting seats and connecting seats symmetrically arranged at both ends of the main counterweight plate, and several additional counterweight plates detachably mounted on the main counterweight plate; the mounting seats are equipped with isolation devices to prevent the main counterweight plate from directly contacting the forklift mast; the connecting seats are connected to the free end of the chain; the total weight of the main counterweight plate and the additional counterweight plates is greater than or equal to the total weight of the chain.

[0007] Furthermore, the number of additional counterweight plates is proportional to the total weight of the chain.

[0008] Furthermore, both the main counterweight plate and the auxiliary counterweight plate are provided with a center hole, and the main counterweight plate and the auxiliary counterweight plate are connected together using standard parts and center holes.

[0009] Furthermore, both the main counterweight plate and the auxiliary counterweight plate are equipped with lifting seats to facilitate lifting and handling.

[0010] Furthermore, the connecting seat includes multiple chain mounting holes arranged side by side. With different gantry widths, the spacing between the two chains is different. The connecting chain is installed by selecting the chain mounting hole corresponding to the chain spacing position.

[0011] Furthermore, the mounting base includes multiple mounting ears arranged side by side, and for different gantry widths, an isolation device is installed between two mounting ears at the corresponding gantry width position.

[0012] Furthermore, the isolation device is a polyurethane roller or a sliding plate.

[0013] A method for preventing collisions with a lifting cylinder used in forklift assembly, the method being based on any of the aforementioned anti-collision devices for lifting cylinders used in forklift assembly, comprising the following steps: Step 1: Install the isolation device: Based on the width of the forklift mast, install the isolation device onto the appropriate mounting bracket; Step 2: Lifting the counterweight plate: Use the lifting base to lift the main counterweight plate to the height of the free end of the chain; Step 3: Connect the chains: Based on the spacing between the two chains, select a suitable connector to connect the free ends of the chains; Step 4: Install additional counterweight plates: Determine the number of additional counterweight plates based on the total weight of the chain, and install the additional counterweight plates one by one onto the main counterweight plate; Step 5: Assemble the sliding frame: Start the forklift lifting cylinder to raise the inner mast to the assembly height, hoist the sliding frame to the assembly position, lower the inner mast, and remove the anti-collision device after the assembly is completed.

[0014] Furthermore, step 4, installing the additional counterweight plate, is completed before the hoisting and installation of the counterweight plate in step 2.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention uses a counterweight plate suspended at the free end of the chain to replace manual tightening of the chain, ensuring that the chain remains taut throughout the assembly of the sliding frame. This solves the problem of slack chains bumping against the piston rod of the lifting cylinder during the assembly of the sliding frame of a counterbalance forklift, ensuring the assembly quality of the lifting cylinder, reducing the input of human resources, lowering labor intensity, and improving assembly efficiency. This invention employs a counterweight system consisting of a main counterweight plate and additional counterweight plates. The number of additional counterweight plates can be selected according to different chain weights, making it flexible in application, adaptable, and easy to assemble and disassemble. The present invention employs an isolation device between the main counterweight plate and the gantry to prevent the main counterweight plate from bumping or scratching the gantry during the assembly and lifting process, and further improves the stability of the main counterweight plate and the chain during the lifting process. This invention allows for the selection of corresponding isolation device mounting bases and chain mounting holes based on the different mast widths and chain spacings of various forklift models. It offers good versatility, simple and convenient installation and disassembly, and high efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly structure of the sliding frame of a counterbalance forklift.

[0017] Figure 2 This is a schematic diagram of the assembly structure of an anti-collision device for lifting cylinders used in forklift assembly according to the present invention.

[0018] Figure 3 This is a schematic diagram of the main counterweight plate structure of a lifting cylinder anti-collision device for forklift assembly according to the present invention.

[0019] Figure 4 This is a schematic diagram of the additional counterweight plate structure of the anti-collision device for lifting cylinders used in forklift assembly according to the present invention.

[0020] in: Main counterweight plate 1, auxiliary counterweight plate 2, isolation device 3, chain 4; Mounting base 101, connecting base 102, lifting base 103, center hole 104. Detailed Implementation

[0021] See Figures 2-4This invention relates to an anti-collision device for lifting cylinders used in forklift assembly, comprising a main counterweight plate 1, mounting seats 101 and connecting seats 102 symmetrically arranged at both ends of the main counterweight plate 1, and a plurality of additional counterweight plates 2 detachably mounted on the main counterweight plate 1; both the main counterweight plate 1 and the additional counterweight plates 2 are provided with a center hole 104, and the main counterweight plate 1 and the additional counterweight plates 2 are connected together using standard parts and the center hole 104; in addition, both the main counterweight plate 1 and the additional counterweight plates 2 are provided with a lifting seat 103 for easy lifting and handling; An isolation device 3 is installed on the mounting base 101 to prevent the main counterweight plate 1 from directly contacting the forklift mast during lifting and lowering. The isolation device 3 is a polyurethane roller or a sliding plate. In the attached drawings of this embodiment, a polyurethane roller is used. It slides on the mast to isolate the main counterweight plate 1 from the forklift mast, making the lifting and lowering process of the main counterweight plate 1 more stable and reducing shaking. At the same time, it protects the mast paint from being bumped or scratched by the counterweight plate. Furthermore, to accommodate different mast widths of different counterbalance forklifts, the mounting base 101 includes multiple mounting ears arranged side by side and at equal intervals. For different mast widths, polyurethane rollers are installed between two mounting ears at the corresponding mast width position to improve the versatility of the invention. The connecting seat 102 includes multiple chain mounting holes arranged side by side. The spacing between the two chains 4 is different under different mast widths of different models of forklifts. Select the chain mounting hole corresponding to the spacing of the chain 4 to install and connect the free end of the chain 4. Use standard parts to connect the free end of the chain 4 to the chain mounting hole. The total weight of the main counterweight plate 1 and the auxiliary counterweight plate 2 must be greater than or equal to the total weight of the chain 4 to ensure the tension effect of the counterweight on the chain, so that the chain remains taut during the lifting cylinder's ascent, preventing the chain 4 from swinging freely and hitting the lifting cylinder piston rod during the mast's lifting process. When assembling different models of forklifts, to further facilitate the determination of the number of auxiliary counterweight plates 2, the number of auxiliary counterweight plates 2 can be determined according to the different total weights of the chain 4, in a way that is directly proportional to the two. The specific proportional coefficient can be determined by calculation or experience, ensuring that the total weight of the main counterweight plate 1 and the auxiliary counterweight plate 2 is greater than or equal to the total weight of the chain 4.

[0022] On the other hand, the present invention relates to a method for preventing collisions with a lifting cylinder used in forklift assembly, which is based on the anti-collision device for a lifting cylinder used in forklift assembly described in the above embodiments, and includes the following steps: Step 1: Install the isolation device: Based on the width of the forklift mast, use standard parts to install the polyurethane rollers of the isolation device 3 onto the appropriate mounting ears of the mounting base 101. Ensure that the polyurethane rollers are in contact with the mast during use, protect the mast paint, and provide more stable support for the main counterweight plate 1 to prevent it from shaking during lifting and lowering, and further stabilize the chain 4. Step 2: Lifting the counterweight plate: Use the lifting base 103 to lift the main counterweight plate 1 to the height of the free end of the chain 4, in preparation for connecting the chain 4; Step 3: Connect the chains: Based on the spacing between the two chains 4, select the appropriate chain mounting hole on the connector 102, and use standard parts to connect and fix the free end of the chain 4 to the chain mounting hole; Step 4: Install the additional counterweight plates: Determine the number of additional counterweight plates 2 based on the total weight of chain 4, and use standard parts to install the additional counterweight plates 2 one by one onto the main counterweight plate 1 through the center hole 104; the number of additional counterweight plates 2 can be selected by calculation or experience to ensure that the total weight of the main counterweight plate 1 and the additional counterweight plate 2 is greater than or equal to the total weight of the chain, thereby ensuring that the chain remains taut during the lifting cylinder's ascent; this step can also be completed before installing the counterweight plates in Step 2; Step 5: Assemble the sliding frame: Start the forklift lifting cylinder to raise the inner mast to the assembly height, hoist the sliding frame to the assembly position, lower the inner mast, and remove the anti-collision device after assembly. Thanks to the counterweight plate that tightens the chain 4, replacing manual tightening, the chain 4 remains taut during mast lifting and lowering, preventing it from swinging freely and hitting the lifting cylinder piston rod, ensuring the assembly quality of the lifting cylinder, reducing the input of human resources, and reducing labor intensity.

[0023] Additionally, it should be noted that the above-described specific implementation is merely an optimized solution of this patent, and any modifications or improvements made by those skilled in the art based on the above concept are within the scope of protection of this patent.

Claims

1. A method for preventing collisions with a lifting cylinder used in forklift assembly, characterized in that: This is based on a forklift assembly lifting cylinder anti-collision device, which includes a main counterweight plate (1), mounting seats (101) and connecting seats (102) symmetrically arranged at both ends of the main counterweight plate (1), and several additional counterweight plates (2) detachably installed on the main counterweight plate (1); the mounting seats (101) are equipped with isolation devices (3) to prevent the main counterweight plate (1) from directly contacting the forklift mast; the connecting seats (102) are connected to the free end of the chain (4); the total weight of the main counterweight plate (1) and the additional counterweight plates (2) is greater than or equal to the total weight of the chain (4); the main counterweight plate (1) and the additional counterweight plates (2) are both equipped with lifting seats (103) for easy lifting and handling; The anti-collision method includes the following steps: Step 1: Install the isolation device: Based on the width of the forklift mast, install the isolation device (3) onto the appropriate mounting base (101); Step 2: Lifting the counterweight plate: Using the lifting base (103), lift the main counterweight plate (1) to the height of the free end of the chain (4); Step 3: Connect the chains: Based on the distance between the two chains (4), select a suitable connector (102) to connect the free end of the chain (4); Step 4: Install additional counterweight plates: Determine the number of additional counterweight plates (2) based on the total weight of the chain (4), and install the additional counterweight plates (2) one by one onto the main counterweight plate (1); Step 5: Assemble the sliding frame: Start the forklift lifting cylinder to raise the inner mast to the assembly height, hoist the sliding frame to the assembly position, lower the inner mast, and remove the anti-collision device after the assembly is completed.

2. The method for preventing collisions with lifting cylinders used in forklift assembly according to claim 1, characterized in that: The number of additional counterweight plates (2) is proportional to the total weight of the chain (4).

3. The method for preventing collisions with lifting cylinders used in forklift assembly according to claim 1, characterized in that: Both the main counterweight plate (1) and the auxiliary counterweight plate (2) are provided with a center hole (104), and the main counterweight plate (1) and the auxiliary counterweight plate (2) are connected together by standard parts and the center hole (104).

4. The method for preventing collisions with lifting cylinders used in forklift assembly according to claim 1, characterized in that: The connecting seat (102) includes multiple chain mounting holes arranged side by side. The spacing between the two chains (4) is different under different gantry widths. The connecting chain (4) is installed by selecting the chain mounting hole at the corresponding chain (4) spacing position.

5. The method for preventing collisions with lifting cylinders used in forklift assembly according to claim 1, characterized in that: The mounting base (101) includes multiple mounting ears arranged side by side. For different gantry widths, an isolation device (3) is installed between two mounting ears at the corresponding gantry width position.

6. The method for preventing collisions with lifting cylinders used in forklift assembly according to claim 1, characterized in that: The isolation device (3) is a polyurethane roller or a sliding plate.

7. The method for preventing collisions with lifting cylinders used in forklift assembly according to claim 1, characterized in that: Step 4, installing the additional counterweight plate, is completed before the lifting and installation of the counterweight plate in step 2.

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