Chassis structure of pallet truck

Abstract

The utility model discloses a chassis structure of a pallet truck, which relates to the technical field of pallet handling equipment and comprises a frame, a driving assembly is mounted on the frame, and a driving wheel is mounted at the bottom end of the driving assembly; a plurality of damping shafts are symmetrically arranged on the two sides of the driving assembly, the upper ends of the damping shafts are rotationally connected with the frame, the lower ends of the damping shafts are rotationally connected with auxiliary wheel supports, the other ends of the auxiliary wheel supports are rotationally connected with the frame, and the bottom faces of the auxiliary wheel supports are connected with auxiliary wheels. According to the chassis structure of the pallet truck, the technical problems that the elastic force of an auxiliary wheel floating structure in the pallet truck is too large, so that a driving wheel is prone to slipping, and when the pallet truck turns and rolls, a damping shaft and an elastic body are prone to being rapidly pressed and compressed, so that one side is inclined, and goods have the risk of tipping over are solved. The damping shaft plays a good supporting role at the moment when the floating structure is compressed, the vehicle is prevented from rapidly inclining towards one side, and the stability of the whole vehicle during high-speed turning and running on an uneven road surface is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pallet transport equipment, in particular to a chassis structure of a pallet transport vehicle. Background Art

[0002] A pallet truck generally has a five-point structure, with two sets of load-bearing wheels on the load-bearing end and two sets of auxiliary wheels and one driving wheel on the driving end. The chassis structure usually adopts a structure in which the driving wheels are fixed and the auxiliary wheels are floating.

[0003] The traditional auxiliary wheel floating structure generally uses a mechanical spring or a polyurethane elastomer. In order to ensure the stability of the entire vehicle during operation, the stiffness of the elastomer must be large enough to ensure the stability of the entire vehicle. However, the excessive elastic force of the auxiliary wheel floating structure in the above-mentioned pallet truck can easily lead to a reduction in the wheel load of the driving wheel, especially when the pallet truck is unloaded or lightly loaded, and encounters uneven ground, the auxiliary wheel contacts the ground, and the driving wheel cannot contact the ground, causing the driving wheel to slip. On the other hand, for the sake of comfort, the existing damping shaft is set with a small damping force in the compression stroke, and the damping shaft and the elastomer are easily compressed by rapid downward pressure, causing one side of the vehicle to tilt and the risk of the cargo tipping over. Therefore, a chassis structure of a pallet truck is proposed to solve the above-mentioned problems. Utility Model Content

[0004] The utility model aims to provide a chassis structure of a pallet truck, which solves the technical problems that the elastic force of the auxiliary wheel floating structure in the pallet truck is too large, which easily causes the driving wheel to slip, and when the pallet truck turns and tilts, the damping shaft and the elastic body are easily pressed down and compressed quickly, causing one side to tilt and the risk of overturning of the goods.

[0005] In order to achieve the above-mentioned object, the utility model provides a chassis structure of a pallet truck, comprising:

[0006] A vehicle frame, a driving assembly is mounted on the vehicle frame, and a driving wheel is mounted on the bottom end of the driving assembly;

[0007] The floating structure comprises: a damping shaft, a plurality of damping shafts are symmetrically arranged on both sides of the driving 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 one end of an auxiliary wheel bracket, the other end of the auxiliary wheel bracket is rotatably connected to the frame through a mounting block, and the bottom surface of the auxiliary wheel bracket is connected to the auxiliary wheel;

[0008] The return spring is coaxially arranged on the circumferential outer side of the damping shaft, and two ends of the return spring are respectively connected to two ends of the damping shaft.

[0009] Preferably, a plurality of assembly frames are arranged on the frame, the bottom end of the assembly frame is fixedly connected to the frame, a fixing rod is arranged on the top of the assembly frame, the fixing rod is threadedly connected to the assembly frame, the bottom end of the fixing rod is connected to a mounting seat, the mounting seat connecting member, and the lower part of the connecting member is rotatably connected to the upper end of the damping shaft through a first pin shaft.

[0010] Preferably, a mounting column is integrally provided at the upper end of the connecting member, a clamping groove is provided on the outer peripheral side of the mounting column, the clamping groove extends along the length direction of the mounting column, and the mounting seat is clamped and connected to the clamping groove via a limit pin.

[0011] Preferably, both ends of the return spring are provided with limit baffles, and the two limit baffles are respectively connected to the two ends of the return spring.

[0012] Preferably, two groups of connecting frame plates are symmetrically arranged on the top surface of the auxiliary wheel bracket, wherein one group of connecting frame plates is rotatably connected to the lower end of the mounting block via a second pin shaft, and the other group of connecting frame plates is connected to the lower end of the damping shaft via a third pin shaft.

[0013] Preferably, a rolling sleeve is sleeved on the outer peripheral side surface of the second pin shaft, and the outer peripheral side surface of the rolling sleeve is connected to the lower end of the mounting block.

[0014] Preferably, a plurality of assembly holes are provided on the bottom surface of the frame, a bearing seat is provided on the upper end surface of the auxiliary wheel bracket, the bearing seat is inserted into the assembly hole, and the outer diameter of the bearing seat is smaller than the inner diameter of the assembly hole.

[0015] Preferably, a plurality of mounting holes are arranged on the frame, a plurality of process holes are arranged on the upper end surface of the mounting block, and each of the process holes is connected to one of the mounting holes via a second bolt rod.

[0016] Preferably, a guide hole is provided on one side of one of the hanging holes, and the diameter of the guide hole is larger than the diameter of the hanging hole, and the side surface of the guide hole is connected to the side surface of the hanging hole.

[0017] Compared with the above-mentioned background technology, the chassis structure of a pallet truck provided by the utility model has a large damping force in the compression stroke of the damping shaft. When the whole vehicle tilts, the pressure on the auxiliary wheel located on the side of the tilt direction of the whole vehicle increases instantly. The floating structure is almost rigid at the moment of compression, which can play a good supporting role at the moment when the auxiliary wheel is compressed, preventing the vehicle from tilting quickly to one side and the whole vehicle from shaking left and right, improving the stability of the whole vehicle in high-speed turns and driving on uneven roads, and at the same time, the damping shaft can be slowly compressed to ensure the passability on uneven roads. The damping force of the extension stroke of the damping shaft is small. By setting a return spring with a smaller elastic coefficient to cooperate with the damping shaft, the wheel load of the driving wheel can be maximized while ensuring the restoration of the compression stroke of the damping shaft. When encountering uneven ground, the return spring is easily compressed while the damping shaft contracts. Even if the auxiliary wheel contacts the ground, it still does not affect the contact of the driving wheel with the ground, which can effectively prevent the driving wheel from slipping on uneven roads. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 A three-dimensional structural diagram of the chassis structure provided by an embodiment of the utility model;

[0020] Figure 2 A front view of a chassis structure provided by an embodiment of the utility model;

[0021] Figure 3 A cross-sectional schematic diagram of a chassis structure provided by an embodiment of the utility model;

[0022] Figure 4 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0023] Figure 5 An exploded schematic diagram of a floating structure provided by an embodiment of the utility model;

[0024] Figure 6 A three-dimensional structural diagram of the auxiliary wheel bracket and the mounting block provided in the embodiment of the utility model;

[0025] Figure 7 An exploded schematic diagram of the auxiliary wheel bracket, auxiliary wheel and mounting block provided in an embodiment of the utility model.

[0026] Specifically, 1-frame; 2-driving wheel; 3-damping shaft; 4-auxiliary wheel bracket; 5-mounting block; 6-reset spring; 7-assembly frame; 8-first pin shaft; 9-limit baffle; 10-connecting frame plate; 11-second pin shaft; 12-third pin shaft; 13-rolling bushing; 14-bearing seat; 15-assembly hole; 16-hanging hole; 17-process hole; 18-guide hole; 19-flange bolt; 20-auxiliary wheel; 21-first pin hole; 22-second pin hole; 23-fixing rod; 24-mounting seat; 25-connecting piece; 26-circlip; 27-slot; 28-limiting pin; 29-bearing; 30-shaft retaining ring; 31-fixing frame; 32-pin. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] like Figure 1 As shown, a chassis structure of a pallet truck includes: a frame 1, a floating structure and auxiliary wheels 20. A drive assembly is installed on the frame 1, wherein the drive assembly is located at the front end of the frame 1, that is, the left side in the figure, and a drive wheel 2 is installed at the bottom end of the drive assembly.

[0030] like Figure 2 and Figure 3 As shown, the floating structure includes: two damping shafts 3 symmetrically arranged on both sides of the driving assembly. By symmetrically arranging the two damping shafts 3 on both sides of the driving assembly, no matter which direction the whole vehicle tilts, it is ensured that the auxiliary wheel 20 can provide a stable auxiliary supporting force, the upper end of the damping shaft 3 is rotatably connected to the frame 1, the lower end of the damping shaft 3 is rotatably connected to one end of the auxiliary wheel bracket 4, the other end of the auxiliary wheel bracket 4 is rotatably connected to the frame 1, and the bottom surface of the mounting block 5 is connected to the auxiliary wheel 20, wherein the damping shaft 3 with a large instantaneous damping force is used to ensure that the whole vehicle is almost rigid at the moment of instantaneous tilting and downward pressure, thereby improving the anti-rollover ability of the whole vehicle.

[0031] It should be noted that during the movement of the vehicle, the driving wheel 2 is always in contact with the ground, and the auxiliary wheel 20 is also always in contact with the ground. Since the elastic force provided by the return spring 6 is relatively small, the adhesion of the driving wheel can be well guaranteed to ensure that the driving wheel 2 does not slip during driving, especially when encountering uneven ground, the driving wheel 2 can still contact the ground to provide driving force for the whole vehicle.

[0032] A return spring 6 is coaxially arranged on the circumferential outer side of the damping shaft 3, and two ends of the return spring 6 are respectively connected to the two ends of the damping shaft 3. The length direction of the return spring 6 is consistent with the axial direction of the damping shaft 3. The return spring 6 is mainly used to restore the compression stroke of the damping shaft 3, wherein the elastic force of the return spring 6 is set to be small, that is, the elastic coefficient of the return spring 6 is small, so as to improve the distribution of the wheel load of the driving wheel 2 and reduce the requirement for the weight of the whole vehicle. When encountering uneven ground, the return spring 6 is easily compressed while the damping shaft 3 contracts. Even if the auxiliary wheel 20 contacts the ground, it still does not affect the contact of the driving wheel 2 with the ground, and can effectively prevent the driving wheel 2 from slipping on uneven roads.

[0033] The working process is as follows: when the vehicle has a tendency to roll during driving, the downforce on the auxiliary wheel 20 located on the side of the vehicle's roll direction increases instantly. Since the damping force of the compression stroke of the damping shaft is large, the damping shaft 3 is almost rigid at the moment the floating structure is compressed, and can instantly provide good support, effectively preventing the vehicle from tilting rapidly to one side. The compression stroke of the damping shaft 3 is maintained for a period of time and then gradually shortened, effectively removing the impact force of the vehicle when rolling, causing the vehicle to roll slowly, thereby improving the stability of the vehicle during high-speed turns and driving on uneven roads.

[0034] like Figure 4 and Figure 5 As shown, two assembly frames 7 are arranged on the frame 1, and the bottom ends of the two assembly frames 7 are fixedly connected to the frame 1, and a fixing rod 23 is arranged on the top of the assembly frame 7, and the fixing rod 23 is threadedly connected to the assembly frame 7, and the bottom end of the fixing rod 23 is connected to the mounting seat 24, and the mounting seat 24 is connected to a connecting piece 25, and the lower part of the connecting piece 25 is rotatably connected to the upper end of the damping shaft 3 through a first pin shaft 8, and the cylindrical section at the upper end of the connecting piece 25 can be inserted into the mounting seat 24 and slide up and down. When the road surface is uneven and the adhesion between the driving wheel 2 and the ground is insufficient, the fixing rod 23 is screwed forward to increase the height of the fixing rod 23, and the fixing rod 23 drives the height of the connecting piece 25, thereby increasing the height of the auxiliary wheel 20, reducing the supporting force of the auxiliary wheel 20 on the frame 1, so that the driving wheel 2 can always contact the ground, and further avoiding the driving wheel 2 from slipping.

[0035] It should be noted that a limit pin 28 for fixing the position of the connector 25 on the mounting seat 24 is provided at the upper part of the connector 25, and a mounting column is integrally provided at the upper end of the connector 25. A slot 27 is provided on the outer peripheral side of the mounting column. The slot 27 extends along the length direction of the mounting column. The limit pin 28 can penetrate the mounting seat 24 and be inserted into the slot 27 to limit the connector 25. After the connector 25 is adjusted to a suitable position on the mounting seat 24, the connector 25 is locked on the mounting seat 24 by the limit pin 28, and the limit pin 28 is locked by a nut at the same time.

[0036] In addition, the lower part of the connecting member 25 is rotatably connected to the upper end of the damping shaft 3 through the first pin shaft 8, and the first pin shaft 8 is locked on the connecting member 25 through the retaining spring 26. Preferably, a rotating sleeve (not shown in the figure) is installed on the outer peripheral side of the first pin shaft 8, the outer peripheral side of the rotating sleeve is clamped with the connecting member, and the inner peripheral side of the rotating sleeve is sleeved and connected with the first pin shaft 8. When the damping shaft 3 rotates freely relative to the assembly frame 7, the friction between the upper end of the damping shaft 3 and the first pin shaft 8 is reduced, thereby improving the service life of the first pin shaft 8.

[0037] The assembly frame 7 is U-shaped as a whole, and the U-shaped opening faces the bottom surface of the frame 1. The damping shaft 3 is arranged between the assembly frames 7. When the damping shaft 3 is installed, it can form a certain enclosure effect for the damping shaft 3. In addition, according to the model and size of the damping shaft 3, assembly frames 7 of different sizes are selected to be suitable for the installation of the damping shaft 3.

[0038] Specifically, limit baffles 9 are provided at both ends of the return spring 6. The limit baffles 9 are arranged in a disc shape as a whole, and the two limit baffles 9 are integrally arranged at both ends of the damping shaft 3. The two limit baffles 9 are respectively connected to the two ends of the return spring 6. According to the change of the compression stroke of the damping shaft 3, the two limit baffles 9 can be synchronously driven to move closer to or away from each other.

[0039] like Figure 6 and Figure 7 As shown, two groups of connecting frame plates 10 are symmetrically arranged on the top surface of the auxiliary wheel bracket 4. Both groups of connecting frame plates 10 are integrally formed with the auxiliary wheel bracket 4. One group of connecting frame plates 10 is hingedly connected to the lower end of the mounting block 5 through the second pin shaft 11, and the other group of connecting frame plates 10 is connected to the lower end of the damping shaft 3 through the third pin shaft 12. That is, both ends of the auxiliary wheel bracket 4 can rotate freely. When the auxiliary wheel 20 is subjected to the reaction force of the ground, the damping shaft 3 and the return spring 6 shrink, and the auxiliary wheel 20 moves upward in a circular motion with the second pin shaft 11 as the axis, slowly unloading the impact force when the whole vehicle rolls, and playing a certain shock-absorbing and buffering effect. When the auxiliary wheel 20 moves up and down, the two ends of the auxiliary wheel bracket 4 are always stably supported, thereby improving the stability of the whole vehicle during travel.

[0040] A rolling sleeve 13 is sleeved on the outer side surface of the second pin shaft 11, and correspondingly, a docking hole is set at the lower end of the mounting block 5, and the outer side surface of the rolling sleeve 13 is clamped and connected to the docking hole. The setting of the rolling sleeve 13 can prevent the second pin shaft 11 from rotating directly relative to the mounting block 5, thereby avoiding damage to the second pin shaft 11 and the mounting block 5 due to excessive friction.

[0041] In addition, a limiting plate is integrally provided at the right end of the second pin shaft 11, and a first pin hole 21 is provided on one side of the limiting plate. At the same time, a second pin hole 22 is provided on the side of the connecting frame plate 10 corresponding to the second pin shaft 11. The first pin hole 21 and the second pin hole 22 are coaxially arranged, and the pin 32 simultaneously penetrates the first pin hole 21 and the second pin hole 22 to lock the second pin shaft 11. When the auxiliary wheel 20 reciprocates in a circular motion up and down with the second pin shaft 11 as the axis, the second pin shaft 11 will not directly rotate and rub against the connecting frame plate 10, thereby improving the overall life of the auxiliary wheel bracket 4.

[0042] In one embodiment of the utility model, a docking portion is provided at the lower end of the mounting block 5, and the mounting hole is penetrated in the docking portion, wherein the docking portion is clamped and connected to one set of connecting frame plates 10. The setting of the docking portion can assist in guiding and correcting the movement path of the auxiliary wheel bracket 4, avoid the phenomenon of left and right movement, and improve the stability of the auxiliary wheel 20 when providing support force.

[0043] Two assembly holes 15 are arranged on the bottom surface of the vehicle frame 1, and the two assembly holes 15 are symmetrically arranged on both sides of the driving assembly. A bearing seat 14 is arranged on the upper end surface of the auxiliary wheel bracket 4, wherein the bearing seat 14 and the auxiliary wheel bracket are a welded whole, the bearing seat 14 is connected to the fixing frame 31 through the bearing 29, and the fixing frame 31 is locked on the bearing seat 14 through the shaft retaining ring 30. When the vehicle changes direction, the auxiliary wheel 20 rotates relative to the bearing seat 14. In addition, the bottom end of the fixing frame 31 is rotatably connected to the auxiliary wheel 20 through a rotating shaft, and the bearing seat 14 is inserted and arranged in the assembly hole 15. The assembly hole 15 is mainly used for auxiliary assembly of the auxiliary wheel bracket 4, wherein the outer diameter of the bearing seat 14 is smaller than the inner diameter of the assembly hole 15, so as to ensure that the auxiliary wheel 20 reciprocates up and down in a circular motion with the second pin shaft 11 as the axis.

[0044] The frame 1 is provided with a plurality of mounting holes 16, and the upper end surface of the mounting block 5 is provided with a plurality of process holes 17, each process hole 17 corresponds to a mounting hole 16, that is, each process hole 17 is connected to a mounting hole 16 through a second bolt rod. The mounting block 5 is fixed to the bottom surface of the frame 1 through the second bolt rod, and the mounting block 5 is mainly used to assist the frame 1 to rotatably connect to the auxiliary wheel bracket 4, and stably connect the auxiliary wheel bracket 4 to the bottom surface of the frame 1.

[0045] A guide hole 18 is provided on one side of one of the mounting holes 16, and the aperture of the guide hole 18 is larger than that of the mounting hole 16. The side of the guide hole 18 is connected with the side of the mounting hole 16 to form a hole. When installing the auxiliary wheel 20 assembly, a flange bolt 19 is pre-installed in the process hole 17, and the flange bolt 19 is hung on the mounting hole 16 of the frame 1 through the guide hole 18, and then the other second bolt rods are assembled, which effectively reduces the work intensity and assembly difficulty.

[0046] The working principle of the utility model is as follows: when the whole vehicle rolls, the pressure on the auxiliary wheel 20 located on one side of the whole vehicle's roll direction increases instantly. Due to the use of the damping shaft 3 with a large instantaneous damping force, the damping shaft 3 is almost rigid at the moment when the floating structure is compressed, and can play a good supporting role. After the damping shaft 3 maintains the initial compression stroke for a short time, it slowly shrinks the compression stroke, and the reset spring 6 and the damping shaft 3 shrink synchronously. The auxiliary wheel 20 moves upward in a circular motion with the second pin shaft 11 as the axis, slowly unloading the impact force when the whole vehicle rolls, preventing the vehicle from tilting quickly to one side, and improving the stability of the whole vehicle when turning at high speed and on uneven roads. When the whole vehicle is on a flat road and driving in a straight line, the wheel load allocated to the driving wheel 2 is increased, and the driving wheel 2 serves as the main wheel load. The reset spring 6 releases the elastic potential energy, driving the damping shaft 3 to slowly return to the initial state, effectively ensuring that the whole vehicle maintains stable travel.

[0047] It should be noted that while ensuring the compression stroke of the restoring damping shaft 3, the elastic coefficient of the return spring 6 is as small as possible, so as to maximize the wheel load of the driving wheel 2, especially when encountering uneven ground, the return spring 6 is easily compressed while the damping shaft 3 contracts. Even if the auxiliary wheel 20 contacts the ground, it still does not affect the contact of the driving wheel 2 with the ground. The auxiliary wheel 20 has better floating performance, which can effectively prevent the driving wheel 2 from slipping on uneven roads, thereby ensuring the passability of the entire vehicle.

[0048] In summary, since the damping force of the compression stroke of the damping shaft 3 is large, the damping shaft 3 plays a good supporting role at the moment when the floating structure is compressed, preventing the vehicle from tilting rapidly to one side, improving the stability of the vehicle during high-speed turns and driving on uneven roads, and at the same time, the damping shaft can be slowly compressed to ensure the passability on uneven roads. In addition, the damping force of the extension stroke of the damping shaft 3 is small. By setting a reset spring 6 with a small elastic coefficient in conjunction with the damping shaft 3, while ensuring the restoration of the compression stroke of the damping shaft, the wheel load of the driving wheel 2 can be maximized, and the auxiliary wheel 20 contacts the ground without affecting the contact of the driving wheel 2 with the ground, preventing the driving wheel 2 from slipping on uneven roads.

[0049] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0050] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the utility model.

Claims

1. A chassis structure of a pallet truck, characterized in that: include: A vehicle frame, a driving assembly is mounted on the vehicle frame, and a driving wheel is mounted on the bottom end of the driving assembly; The floating structure comprises: a damping shaft, a plurality of damping shafts are symmetrically arranged on both sides of the driving 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 one end of an auxiliary wheel bracket, the other end of the auxiliary wheel bracket is rotatably connected to the frame through a mounting block, and the bottom surface of the auxiliary wheel bracket is connected to the auxiliary wheel; The return spring is coaxially arranged on the circumferential outer side of the damping shaft, and two ends of the return spring are respectively connected to two ends of the damping shaft.

2. The chassis structure of a pallet truck according to claim 1, characterized in that: A plurality of assembly frames are arranged on the frame, the bottom end of the assembly frame is fixedly connected to the frame, a fixing rod is arranged on the top of the assembly frame, the fixing rod is threadedly connected to the assembly frame, the bottom end of the fixing rod is connected to a mounting seat, the mounting seat connecting piece, and the lower part of the connecting piece is rotatably connected to the upper end of the damping shaft through a first pin shaft.

3. The chassis structure of a pallet truck according to claim 2, characterized in that: The upper end of the connecting piece is integrally provided with a mounting column, and the outer peripheral side of the mounting column is provided with a clamping groove, the clamping groove extends along the length direction of the mounting column, and the mounting seat is clamped and connected to the clamping groove through a limit pin.

4. The chassis structure of a pallet truck according to claim 1, characterized in that: Limit baffles are arranged at both ends of the return spring, and the two limit baffles are respectively connected to the two ends of the return spring.

5. A chassis structure of a pallet truck according to any one of claims 1 to 4, characterized in that: Two groups of connecting frame plates are symmetrically arranged on the top surface of the auxiliary wheel bracket, wherein one group of connecting frame plates is rotatably connected to the lower end of the mounting block through a second pin shaft, and the other group of connecting frame plates is connected to the lower end of the damping shaft through a third pin shaft.

6. The chassis structure of a pallet truck according to claim 5, characterized in that: A rolling sleeve is sleeved on the outer peripheral side surface of the second pin shaft, and the outer peripheral side surface of the rolling sleeve is connected to the lower end of the mounting block.

7. The chassis structure of a pallet truck according to claim 5, characterized in that: A plurality of assembly holes are arranged on the bottom surface of the frame, a bearing seat is arranged on the upper end surface of the auxiliary wheel bracket, the bearing seat is inserted into the assembly hole, and the outer diameter of the bearing seat is smaller than the inner diameter of the assembly hole.

8. A chassis structure of a pallet truck according to any one of claims 1 to 4, characterized in that: The frame is provided with a plurality of mounting holes, the upper end surface of the mounting block is provided with a plurality of process holes, and each of the process holes is connected to one of the mounting holes through a second bolt rod.

9. The chassis structure of a pallet truck according to claim 8, characterized in that: A guide hole is arranged on one side of one of the hanging holes, and the diameter of the guide hole is larger than the diameter of the hanging hole, and the side surface of the guide hole is connected with the side surface of the hanging hole.

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