Chassis structure of a pallet truck

Abstract

The utility model discloses a bottom plate structure of pallet carrier, including bottom plate body and protection box, the top end symmetrical of bottom plate body is provided with protection box, the inside of protection box all is provided with first electric push rod, the output all of first electric push rod installs first push arm, the bottom all of first push arm swing installation has linkage block, the one end all of linkage block is away from first push arm and is provided with linkage arm, and linkage arm and linkage block swing joint, the lateral wall all of first electric push rod is provided with support arm, the one end all of linkage arm is close to support arm and is provided with hinged axle, and linkage arm is through hinged axle with support arm swing joint, the one end all of linkage arm is away from support arm and swing installation has support wheel. The utility model not only has realized to the carrier to provide additional support point position to make the carrier travel more stable, has facilitated to the tray of different models to carry simultaneously to lift, and has improved the efficiency of tray carrying.

Description

Technical Field

[0001] This utility model relates to the technical field of pallet handling equipment, specifically to a chassis structure for a pallet handling vehicle. Background Technology

[0002] Pallet trucks are small, lightweight logistics devices powered by a hydraulic system. They move goods horizontally by inserting fork into the pallet forks and can be divided into manual and electric types. Manual types rely on human power to drive the hydraulic system and are suitable for short-distance, light-load operations; electric types are powered by batteries and equipped with an AC motor and intelligent control system, making them suitable for long-distance, heavy-load transport. Pallet trucks typically have a five-point support structure, with two sets of load-bearing wheels on the load-bearing end and two sets of auxiliary wheels and one drive wheel on the drive end. The chassis structure usually adopts a structure where the drive wheel is fixed and the auxiliary wheels are floating. Traditional floating auxiliary wheel structures generally use mechanical springs or polyurethane elastomers. To ensure the stability of the entire vehicle during operation, the stiffness of the elastomer must be large enough to guarantee the stability of the entire vehicle. However, in the pallet trucks mentioned above, excessive elasticity of the floating auxiliary wheel structure can easily lead to a reduction in the wheel load of the drive wheel. Especially when the pallet truck is empty or has a small load, if it encounters uneven ground, the auxiliary wheels will contact the ground while the drive wheel cannot, causing the drive wheel to slip. To make the pallet truck travel more smoothly and further improve pallet handling efficiency, a chassis structure for the pallet truck is proposed.

[0003] For example, the chassis structure of a pallet handling vehicle disclosed in the authorization announcement number CN222780468U includes a frame, a drive assembly mounted on the frame, a drive wheel mounted on the bottom of the drive assembly; multiple damping shafts are symmetrically arranged on both sides of the drive assembly, the upper end of the damping shaft is rotatably connected to the frame, the lower end of the damping shaft is rotatably connected to the auxiliary wheel bracket, the other end of the auxiliary wheel bracket is rotatably connected to the frame, and the bottom surface of the auxiliary wheel bracket is connected to the auxiliary wheel; While achieving the aforementioned chassis structure of the pallet truck, it solves the technical problems of excessive elasticity in the auxiliary wheel floating structure causing drive wheel slippage, and the damping shaft and elastomer being easily compressed rapidly when the pallet truck tilts to one side, leading to a risk of tipping over. The floating structure provides excellent support to the damping shaft at the moment of compression, preventing the vehicle from tilting rapidly to one side and improving the stability of the entire vehicle during high-speed turns and on uneven roads. However, this does not solve the problem that the existing chassis structure is not conducive to providing additional support points for the pallet truck to make the truck move more smoothly, nor is it conducive to simultaneously lifting and moving pallets of different models, thus affecting the efficiency of pallet handling. Utility Model Content

[0004] The purpose of this utility model is to provide a chassis structure for a pallet truck, so as to solve the problem mentioned in the background art that the chassis structure is not convenient for providing additional support points for the truck to make the truck travel more smoothly, and is not conducive to simultaneously lifting and transporting pallets of different models, thus affecting the efficiency of pallet handling.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a chassis structure for a pallet transport vehicle, comprising a chassis body and a protective box. The protective box is symmetrically arranged at the top of the chassis body. Each protective box contains a first electric push rod. The output end of each first electric push rod is equipped with a first push arm. The bottom end of each first push arm is movably equipped with a linkage block. The end of each linkage block away from the first push arm is equipped with a linkage arm, and the linkage arm is movably connected to the linkage block. The side wall of each first electric push rod is equipped with a support arm. The end of each linkage arm near the support arm is equipped with a hinge shaft, and the linkage arm is movably connected to the support arm through the hinge shaft.

[0006] Preferably, the end of the linkage arm away from the support arm is movably equipped with a support wheel, and a second electric push rod is provided on the surface of the chassis body on one side of a set of protective boxes, and a second push arm is installed at the output end of the second electric push rod.

[0007] Preferably, a movable frame is installed at the end of the second push arm away from the second electric push rod, and the movable frame is slidably connected to the chassis body.

[0008] Preferably, the movable frame has an integrated frame inside, and a bidirectional lead screw is movably installed inside the integrated frame.

[0009] Preferably, the surface of the bidirectional lead screw is fitted with two sets of threaded sleeves, and the threaded sleeves are threadedly connected to the bidirectional lead screw, and each threaded sleeve is provided with an installation arm on its side wall.

[0010] Preferably, a servo motor is provided on the side wall of the integrated frame, and the output end of the servo motor is connected to a bidirectional lead screw.

[0011] Preferably, each of the mounting arms has a limiting groove on its surface, a limiting block inside each limiting groove, and a bearing arm on the side wall of each limiting block, and the limiting block is slidably connected to the limiting groove.

[0012] Preferably, each of the mounting arms has a pin on its side wall, and the pin extends through the mounting arm into the interior of the limiting block, and each of the bearing arms has a telescopic arm slidably mounted inside.

[0013] Preferably, each of the side walls of the bearing arm is provided with a locking pin, and the locking pin extends through the bearing arm to the surface of the telescopic arm, and the locking pin is threadedly connected to the bearing arm.

[0014] Preferably, a PLC controller is provided on the surface of the chassis body on one side of the mobile frame, and the output terminal of the PLC controller is electrically connected to the input terminals of the first electric push rod, the second electric push rod, and the servo motor.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the chassis structure not only provides additional support points for the pallet truck, making the pallet truck drive more smoothly and facilitating the simultaneous lifting and transport of pallets of different models, but also improves the efficiency of pallet handling.

[0016] (1) The first electric push rod drives the first push arm to move downward. The first push arm drives the linkage arm to rotate around the hinge axis through the linkage block. The linkage arm drives the support wheel to rotate, so that the support wheel rotates out of the protective box and contacts the ground. The support wheel cooperates with the existing auxiliary wheel to provide support for the chassis body, so that the transport vehicle can move more stably. The second electric push rod drives the second push arm to move. The second push arm drives the moving frame to move. The moving frame drives the integrated frame, the load-bearing arm and the telescopic arm to move to the front end of the chassis body. Then, the locking pin is loosened to disengage the telescopic arm from the load-bearing arm. The telescopic arm is pulled out to move the telescopic arm further away from the load-bearing arm. The length of the support arm is extended by separating it from the support arm, and then the locking pin is tightened to re-fix the telescopic arm and the support arm. The servo motor drives the bidirectional lead screw to rotate, which in turn drives the threaded sleeve to move towards or away from each other. The threaded sleeve drives the mounting arms to move closer or further apart, and the mounting arms can also drive the support arm and telescopic arm to move closer or further apart. This allows for the placement of small pallets of different sizes, thereby improving the handling efficiency. The above design provides additional support points for the pallet truck, making the truck move more smoothly. It can simultaneously lift and move pallets of different models, improving the efficiency of pallet handling.

[0017] (2) When maintenance is required on the load-bearing arm and telescopic arm, simply pull out the pin to separate the limit block from the mounting arm, move the load-bearing arm, and let the load-bearing arm drive the limit block to slide in the limit groove to pull the limit block out of the limit groove. Then the load-bearing arm and telescopic arm can be removed from the surface of the mounting arm for maintenance. After maintenance, they can be reinstalled. The above design allows for quick disassembly and maintenance of the load-bearing arm and telescopic arm, improving the convenience of disassembly and assembly. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a frontal cross-sectional view of the present invention. Figure 3 This is a three-dimensional perspective structural diagram of the movable frame of this utility model; Figure 4This is a three-dimensional perspective structural diagram of the support arm of this utility model; Figure 5 This is a bottom view cross-sectional structural diagram of the movable frame of this utility model.

[0019] In the diagram: 1. Chassis body; 2. PLC controller; 3. Protective box; 4. Moving frame; 5. Bearing arm; 6. First electric push rod; 7. First push arm; 8. Linkage block; 9. Support wheel; 10. Linkage arm; 11. Hinge shaft; 12. Support arm; 13. Second electric push rod; 14. Second push arm; 15. Integrated frame; 16. Mounting arm; 17. Pin; 18. Limiting groove; 19. Limiting block; 20. Threaded sleeve; 21. Locking pin; 22. Telescopic arm; 23. Bidirectional lead screw; 24. Servo motor. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] Example 1 Please see Figure 1-5This utility model provides an embodiment of a pallet truck chassis structure, including a chassis body 1 and a protective box 3. The protective boxes 3 are symmetrically arranged at the top of the chassis body 1. Each protective box 3 contains a first electric push rod 6. A first push arm 7 is mounted on the output end of each first electric push rod 6. A linkage block 8 is movably mounted on the bottom end of each first push arm 7. A linkage arm 10 is provided at the end of each linkage block 8 away from the first push arm 7, and the linkage arm 10 is movably connected to the linkage block 8. Supports are provided on the side walls of each first electric push rod 6. Arm 12 and linkage arm 10 are both provided with hinge shafts 11 at the end near the support arm 12, and linkage arm 10 is movably connected to support arm 12 through hinge shaft 11. Support wheels 9 are movably installed at the end of linkage arm 10 away from support arm 12. A second electric push rod 13 is provided on the surface of chassis body 1 on one side of a set of protective boxes 3. A second push arm 14 is installed at the output end of the second electric push rod 13. A movable frame 4 is installed at the end of the second push arm 14 away from the second electric push rod 13, and the movable frame 4 is slidably connected to chassis body 1. In this utility model, the PLC controller 2 is a Siemens S7-200, which is a mature existing technology. Therefore, its internal structure, working principle, and connection and control method with the electrical components in this application will not be described in detail. During use, if a heavy pallet is being carried, the first electric push rod 6 can be opened to make the transport vehicle move more smoothly. The first electric push rod 6 drives the first push arm 7 to move downward. The first push arm 7 drives the linkage arm 10 to rotate around the hinge shaft 11 through the linkage block 8. The linkage arm 10 drives the support wheel 9 to rotate. The movement causes the support wheel 9 to rotate out of the protective box 3 and contact the ground, allowing the support wheel 9 to cooperate with the existing auxiliary wheels to provide support for the chassis body 1, making the transport vehicle more stable. When the fork arm on the transport vehicle lifts the pallet, there will be space between the fork arm and the chassis body 1. To utilize this space, the second electric push rod 13 can be opened, which drives the second push arm 14 to move. The second push arm 14 drives the moving frame 4 to move, and the moving frame 4 drives the integrated frame 15, the load-bearing arm 5, and the telescopic arm 22 to the ground. At the front end of the tray body 1, loosen the locking pin 21 to disengage the telescopic arm 22 from the support arm 5. Pull the telescopic arm 22 away from the support arm 5 to extend the length of the support arm 5. Then tighten the locking pin 21 to reconnect the telescopic arm 22 to the support arm 5. Place the small pallet on the telescopic arm 22 and the support arm 5 to make full use of the space, allowing more pallets to be moved at once. If the small pallets are of different sizes, the servo motor 24 can be turned on, driving the bidirectional lead screw 23 to rotate. With the threaded connection between the lead screw 23 and the threaded sleeve 20, the double-acting lead screw 23 drives the threaded sleeve 20 to move towards or away from each other, and the threaded sleeve 20 drives the mounting arms 16 to move closer or further away from each other. At the same time, the mounting arms 16 can drive the bearing arms 5 and the telescopic arms 22 to move closer or further away from each other, so as to adapt and place small pallets of different sizes, thereby improving their handling efficiency. The above design can provide additional support points for the pallet truck, making the pallet truck travel more smoothly. It can lift and transport different types of pallets at the same time, improving the efficiency of pallet handling. The movable frame 4 has an integrated frame 15 inside, and a bidirectional lead screw 23 is movably installed inside the integrated frame 15. Two sets of threaded sleeves 20 are fitted on the surface of the bidirectional lead screw 23, and the threaded sleeves 20 are threadedly connected to the bidirectional lead screw 23. The side wall of each threaded sleeve 20 is provided with an mounting arm 16. The side wall of the integrated frame 15 is provided with a servo motor 24, and the output end of the servo motor 24 is connected to the bidirectional lead screw 23. The surface of the mounting arm 16 is provided with a limiting groove 18, the inside of the limiting groove 18 is provided with a limiting block 19, and the side wall of the limiting block 19 is provided with a bearing arm 5, and the limiting block 19 is slidably connected to the limiting groove 18. Each mounting arm 16 has a pin 17 on its side wall, and the pin 17 extends through the mounting arm 16 into the interior of the limiting block 19. Furthermore, each bearing arm 5 has a telescopic arm 22 that is slidably installed inside it. Locking pins 21 are provided on the side walls of the support arm 5, and the locking pins 21 extend through the support arm 5 to the surface of the telescopic arm 22. The locking pins 21 are threadedly connected to the support arm 5. A PLC controller 2 is provided on the surface of the chassis body 1 on one side of the moving frame 4, and the output end of the PLC controller 2 is electrically connected to the input end of the first electric push rod 6, the second electric push rod 13, and the servo motor 24. When maintenance is required on the load-bearing arm 5 and the telescopic arm 22, simply pull out the pin 17 to separate the limiting block 19 from the mounting arm 16, move the load-bearing arm 5, and let the load-bearing arm 5 drive the limiting block 19 to slide in the limiting groove 18 to pull the limiting block 19 out of the limiting groove 18. The load-bearing arm 5 and the telescopic arm 22 can then be removed from the surface of the mounting arm 16 for maintenance. After maintenance is completed, they can be reinstalled. The above design allows for quick disassembly and maintenance of the load-bearing arm and the telescopic arm, improving the convenience of disassembly and assembly.

[0024] Work steps The first electric push rod 6 drives the first push arm 7 to move downwards. The first push arm 7, through the linkage block 8, drives the linkage arm 10 to rotate around the hinge shaft 11. The linkage arm 10 drives the support wheel 9 to rotate, causing the support wheel 9 to rotate out of the protective box 3 and contact the ground. This allows the support wheel 9 to cooperate with the existing auxiliary wheels to provide support for the chassis body 1, making the transport vehicle more stable. When the forks on the transport vehicle lift the pallet, there will be space between the forks and the chassis body 1. To utilize this space, the second electric push rod... 13 drives the second push arm 14 to move, which in turn drives the moving frame 4 to move. The moving frame 4 then drives the integrated frame 15, the load-bearing arm 5, and the telescopic arm 22 to the front end of the chassis body 1. Afterwards, the locking pin 21 is loosened to disengage the telescopic arm 22 from the load-bearing arm 5. The telescopic arm 22 is then pulled out to move it away from the load-bearing arm 5, thus extending the length of the load-bearing arm 5. The locking pin 21 is then tightened to reconnect the telescopic arm 22 to the load-bearing arm 5. Finally, a small tray is placed on the telescopic arm 22 and the load-bearing arm 5. This allows for full utilization of the space, enabling the handling of more pallets at once. If the small pallets are of different sizes, the servo motor 24 drives the bidirectional lead screw 23 to rotate, which in turn moves the threaded sleeve 20 towards or opposite directions. The threaded sleeve 20 then moves the mounting arms 16 closer together or further apart. Simultaneously, the mounting arms 16 move the load-bearing arm 5 and the telescopic arm 22 closer together or further apart, thus adapting to different sizes of small pallets and allowing for the simultaneous handling of different pallet models, thereby improving handling efficiency. To improve transport efficiency, when maintenance is required on the load-bearing arm 5 and the telescopic arm 22, simply pull out the pin 17 to separate the limiting block 19 from the mounting arm 16, move the load-bearing arm 5, and let the load-bearing arm 5 drive the limiting block 19 to slide in the limiting groove 18 to pull the limiting block 19 out of the limiting groove 18. This will allow the load-bearing arm 5 and the telescopic arm 22 to be removed from the surface of the mounting arm 16 for maintenance. After maintenance, they can be reinstalled. The above is the complete usage of the chassis structure of the pallet truck.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A chassis structure for a pallet truck, comprising a chassis body and a protective casing, characterized in that: The top of the chassis body is symmetrically provided with protective boxes. Each protective box contains a first electric push rod. The output end of each first electric push rod is equipped with a first push arm. The bottom end of each first push arm is movably equipped with a linkage block. The end of each linkage block away from the first push arm is provided with a linkage arm, and the linkage arm is movably connected to the linkage block. The side wall of each first electric push rod is provided with a support arm. The end of each linkage arm near the support arm is provided with a hinge shaft, and the linkage arm is movably connected to the support arm through the hinge shaft.

2. The chassis structure of a pallet transporter according to claim 1, characterized in that: Each of the linked arms has a support wheel movably mounted on the end away from the support arm, and a second electric push rod is provided on the surface of the chassis body on one side of a set of protective boxes, with a second push arm installed at the output end of the second electric push rod.

3. The chassis structure of a pallet transporter according to claim 2, characterized in that: A movable frame is installed at the end of the second push arm away from the second electric push rod, and the movable frame is slidably connected to the chassis body.

4. The chassis structure of a pallet transporter according to claim 3, characterized in that: The movable frame has an integrated frame inside, and a bidirectional lead screw is movably installed inside the integrated frame.

5. The chassis structure of a pallet transporter according to claim 4, characterized in that: The surface of the bidirectional lead screw is fitted with two sets of threaded sleeves, and the threaded sleeves are threadedly connected to the bidirectional lead screw. Each threaded sleeve has an installation arm on its side wall.

6. The chassis structure of a pallet transporter according to claim 4, characterized in that: A servo motor is installed on the side wall of the integrated frame, and the output end of the servo motor is connected to a bidirectional lead screw.

7. The chassis structure of a pallet transporter according to claim 5, characterized in that: The surface of each mounting arm is provided with a limiting groove, the inside of each limiting groove is provided with a limiting block, and the side wall of each limiting block is provided with a bearing arm, and the limiting block is slidably connected to the limiting groove.

8. The chassis structure of a pallet transporter according to claim 5, characterized in that: Each mounting arm has a pin on its side wall, and the pin extends through the mounting arm into the interior of the limiting block. Furthermore, each bearing arm has a telescopic arm that is slidably installed inside it.

9. The chassis structure of a pallet transporter according to claim 7, characterized in that: Locking pins are provided on the side walls of the bearing arm, and the locking pins extend through the bearing arm to the surface of the telescopic arm, and the locking pins are threadedly connected to the bearing arm.

10. The chassis structure of a pallet transporter according to claim 4, characterized in that: A PLC controller is installed on the surface of the chassis body on one side of the mobile frame, and the output terminal of the PLC controller is electrically connected to the input terminals of the first electric push rod, the second electric push rod, and the servo motor.

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