Floating type driving assembly and piling car

Abstract

The invention relates to the technical field of piling cars, and particularly discloses a floating type driving assembly which adopts a composite limiting design, compared with the prior art, longitudinal elastic limiting and circumferential rotation limiting are integrated on one limiting structure, the composite limiting design is adopted, the structure of the floating type driving assembly can be greatly simplified, and the service life of the floating type driving assembly is prolonged. According to the floating type driving assembly, the number of independent limiting components is reduced, the material cost and the machining and production cost can be reduced, and the floating type driving assembly can be maintained and replaced more easily and conveniently by reducing the number of the independent components.

Description

Technical Field

[0001] The present invention relates to the technical field of stacking trucks, and in particular to a floating drive assembly and a stacking truck. Background Art

[0002] Stacker refers to various wheeled transporters that are used for loading, unloading, stacking, stacking and short-distance transportation of palletized goods. It is also called a stacker or pallet stacker. The International Organization for Standardization ISO / TC110 calls it an industrial vehicle. Stacker is suitable for operations in narrow passages and limited spaces due to its simple structure, flexible control, good micro-motion and high explosion-proof safety performance. It has become an ideal equipment for loading and unloading pallets in logistics warehousing and workshops. The performance of a stacker depends largely on the coordinated work of its various components, among which the floating drive assembly is a key component. The floating drive assembly is connected to the undercarriage of the stacker and is equipped with drive wheels. It is responsible for controlling the longitudinal floating of the drive wheels to adapt to different road conditions and load conditions, thereby ensuring the stability and controllability of the vehicle.

[0003] The floating drive assembly of an existing stacker usually includes a mounting plate and a support shaft. The mounting plate is connected to the stacker's wheelbase. One end of the support shaft is connected to the drive wheel, and the other end is elastically connected to the mounting plate through a compression spring or other structure. However, the existing floating drive assembly has the following problems during application: while ensuring the longitudinal floating and steering performance of the drive wheel, in order to balance the structural stability, the floating drive assembly of the stacker usually sets a plurality of limit structures at the connection between the mounting plate and the support shaft, such as a longitudinal limit structure that limits the longitudinal floating range of the support shaft, a steering limit structure that limits the rotation range of the support shaft... These limit structures usually have their own division of labor and are independent of each other, which makes the floating drive assembly structure complicated, the production cost high, and the installation and disassembly process more cumbersome. Summary of the invention

[0004] One of the purposes of the present invention is to provide a floating drive assembly which adopts a comprehensive limit design to integrate the longitudinal limit and the steering limit of the shaft head, thereby reducing the structural complexity and production cost.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: A floating drive assembly comprises: a tube shaft, one end of which is connected to a driving wheel mounting seat, and the other end of which is formed with a floating shaft section; a bracket, which is formed with a floating channel for accommodating the floating shaft section; the floating channel extends longitudinally, and a first guide tube and a second guide tube arranged at a higher position relative to the first guide tube are arranged at intervals in its extension path; the floating shaft section is sleeved with a compression spring and is slidably passed through the first guide tube and the second guide tube; a limiting plate is arranged on the floating shaft section and extends radially outward with the floating shaft section as the center; a supporting surface is formed on one end of the limiting plate close to the second guide body, which is used to support the compression spring so that the compression spring axially abuts against the second guide tube to perform longitudinal elastic limiting on the tube shaft; the side wall of the limiting plate is provided with a stop block, which is used to circumferentially abut against the bracket to perform circumferential limiting on the tube shaft.

[0006] Furthermore, the limiting plate includes a plurality of limiting monomers; the plurality of limiting monomers are connected to each other by fasteners and assembled to form the supporting surface and the connecting groove for radially enclosing and clamping the floating shaft segment, and the stopper is arranged on the limiting monomer.

[0007] Furthermore, the floating shaft section is radially recessed to form two groups of shoulders spaced apart from each other, and the two groups of shoulders abut against the limit plate in opposite directions along the length direction of the floating shaft section.

[0008] Furthermore, the stopper is detachably connected to the limiting unit.

[0009] Furthermore, one end of the stopper penetrates the limiting monomer and the floating shaft segment, and is threadedly connected to the limiting monomer and the floating shaft segment.

[0010] Furthermore, the bracket has a rigid support surface; the rigid support surface is located on the swinging path of the block, allowing the block to adapt, fit and extend longitudinally; and also includes a protective cover, which is connected to the bracket by snapping or bonding, and completely or partially covers the rigid support surface, forming a buffer layer on the rigid support surface for buffering protection.

[0011] Furthermore, the protective cover is made of inelastic material.

[0012] Furthermore, a thrust ball bearing is slidably positioned at one end of the second guide tube close to the compression spring; the thrust ball bearing axially abuts against the compression spring and is used for the floating shaft segment to slidably pass through; a locking tube is threadedly connected to the inner wall of one end of the guide tube away from the indentation, the locking tube can allow the floating shaft segment to pass through, and is used to axially abut against the thrust ball bearing to lock the compression spring.

[0013] Furthermore, the second guide tube is threadedly screwed with a limit screw, and the locking tube is provided with at least one limit hole for the limit screw to be threadedly connected.

[0014] Another object of the present application is to provide a stacker, which comprises a chassis and the floating drive assembly as described above, wherein a bracket of the floating drive assembly is detachably connected to the chassis.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: Integrating the longitudinal elastic limit and the circumferential rotation limit into one limit structure (i.e., a composite limit structure) is conducive to simplifying the structure, reducing the number of independent limit components, and reducing material costs and processing and production costs. In addition, by reducing the number of independent components, maintenance and replacement of the floating drive assembly can be made easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the floating drive assembly provided in this embodiment is schematically shown in FIG. Figure 1 ; Figure 2 A schematic structural diagram of a composite limiting structure in a floating drive assembly provided in this embodiment; Figure 3 The structure of the floating drive assembly provided in this embodiment is schematically shown in FIG. Figure 2 ; Figure 4 A schematic diagram of the structure of the bracket in the floating drive assembly provided in this embodiment when the protective cover is not connected; Figure 5 A schematic diagram of the structure of the bracket in the floating drive assembly provided in this embodiment when the protective cover is connected; Figure 6 A partial schematic diagram of the bracket in the floating drive assembly provided in this embodiment when the protective cover is not connected; In the figure: Figure markings: 1. tube shaft; 11. floating shaft section; 12. compression spring; 13. shoulder; 2. bracket; 21. floating channel; 22. first guide tube; 23. second guide tube; 24. rigid support surface; 25. protective cover; 26. thrust ball bearing; 27. locking tube; 28. limit screw; 29. ​​limit hole; 3. driving wheel mounting seat; 4. composite limit structure; 41. limit plate; 42. support surface; 43. block; 44. limit unit; 45. connecting groove; 46. connecting part. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0018] The directional terms in the description of the present invention are only based on the drawings, used to simplify the description, and do not limit the actual orientation of the device or component. The terms "first" and "second" are used for description only and do not indicate importance or quantity. The term "plurality" refers to at least two. The terms "installed", "connected", etc. should be understood in a broad sense, including fixed, detachable, mechanical, electrical or communication connection, directly or indirectly connected, unless otherwise expressly specified. Those skilled in the art can understand the specific meaning of these terms in the present invention.

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings: Embodiment 1 refer to Figure 1 to Figure 6 A floating drive assembly, which is the same as the floating drive assembly used in the existing stacker, includes a pipe shaft 1 and a bracket 2. The pipe shaft 1 is used to connect the operating rod of the stacker. One end of the pipe shaft 1 is connected to a drive wheel mounting seat 3, and the drive wheel mounting seat 3 is used to connect the drive wheel assembly. The other end of the pipe shaft 1 away from the drive wheel mounting seat 3 is formed with a floating shaft section 11 for floating connection with the bracket 2. The floating channel 21 extends longitudinally, and a first guide tube 22 and a second guide tube 23 are arranged at intervals on the longitudinal extension path, wherein the second guide tube 23 is arranged at a high position relative to the first guide tube 22. A compression spring 12 is sleeved on the floating shaft section 11, and the floating shaft section 11 can be slidably penetrated in the first guide tube 22 and the second guide tube 23 (that is, the floating shaft section 11 can slide axially and rotate axially relative to the first guide tube 22 and the second guide tube 23). In addition, the above-mentioned floating drive assembly also includes a limiting structure, which is used to perform longitudinal elastic limiting and circumferential rotation limiting on the pipe shaft 1 during the operation of the floating drive assembly.

[0020] Different from the existing floating drive assembly design that adopts multiple groups of limiting structures to divide the limiting work, the improvement of the present application lies in: adopting an integrated composite limiting design, that is, the floating drive assembly includes a composite limiting structure 4, which is arranged on the floating shaft section 11, and can independently realize the longitudinal elastic limiting and circumferential rotation limiting of the pipe shaft 1 when the floating drive assembly is mounted on a stacker.

[0021] The composite limiting structure 4 includes a limiting plate 41, which is arranged on the floating shaft section 11 and extends radially outward with the floating shaft section 11 as the center. A support surface 42 for supporting the compression spring 12 is formed at one end of the limiting plate 41 close to the second guide body, and a stopper 43 for abutting against the bracket 2 is arranged on the side wall of the limiting plate 41. When working, the compression spring 12 can be supported by the support surface 42 on the limiting plate 41, so that the compression spring 12 abuts against the bottom end of the second guide tube 23 along the axial direction of the floating shaft section 11, thereby elastically limiting the pipe shaft 1 in the longitudinal direction, thereby ensuring the stability of the vehicle. In addition, when the stacker truck performs over-steering, the stopper 43 on the limiting plate 41 can rotate with the floating shaft section 11 and then abut against the bracket 2 in the circumferential direction, thereby limiting the pipe shaft 1 in the circumferential direction.

[0022] Through the above technical solution, the longitudinal elastic limit and the circumferential rotation limit are integrated into one limit structure (i.e., the composite limit structure 4), which greatly simplifies the structure of the floating drive assembly, reduces the number of independent limit components, and helps to reduce material costs and processing production costs. In addition, by reducing the number of independent components, the maintenance and replacement of the floating drive assembly can be made easier.

[0023] To facilitate maintenance and replacement, the limit plate 41 is detachably connected to the floating shaft segment 11. Specifically, in the present embodiment, the limit plate 41 includes a plurality of limit units 44 (in the accompanying drawings, the limit units 44 are specifically two groups), and the plurality of limit units 44 are connected to each other by fasteners (such as bolts, nuts, pins, etc.), and assembled to form a support surface 42, a connecting groove 45 for radially enclosing and clamping the floating shaft segment 11, and a stop block 43 is arranged on the limit unit 44.

[0024] The above technical scheme has the following beneficial effects: 1. On the basis that the limiting disk 41 can be detachably connected to the floating shaft segment 11, a plurality of limiting units 44 are connected to each other by fasteners to form a single limiting disk 41, which can improve the overall structural strength and stability of the limiting disk 41; 2. A connecting groove 45 is formed by splicing a plurality of limiting units, and the limiting disk 41 is radially enclosed and clamped on the floating shaft segment 11 through the connecting groove 45, which can ensure a tight fit between the limiting disk 41 and the floating shaft segment 11.

[0025] In order to enhance the supporting performance of the limit plate 41 on the compression spring 12, in this embodiment, the floating shaft section 11 is radially recessed to form two groups of shoulders 13 spaced apart from each other, and the two groups of shoulders 13 respectively abut the limit plate 41 in the length direction of the floating shaft section 11. By forming two groups of shoulders 13 on the floating shaft section 11, the shoulders 13 abut the limit plate 41 in the opposite direction, thereby effectively preventing the limit plate 41 from axially sliding under the elastic pressure of the compression spring 12, enhancing the stability of the limit plate 41, and making the floating drive assembly more stable when bearing loads and performing steering operations, reducing the risk of failure caused by loose or slipping components, and ensuring the working reliability and safety of the floating drive assembly.

[0026] The shoulder 13 can be formed on the floating shaft segment 11 by simple machining (such as turning or milling) or casting process without additional complicated process.

[0027] Furthermore, considering that the stacker needs to turn frequently during operation, the block 43 frequently abuts the bracket 2 circumferentially and is easily worn and damaged. In the present embodiment, the block 43 is designed to be detachably connected to the limiting unit 44. When the block 43 frequently abuts the bracket 2 and is worn and scrapped, the block 43 can be removed from the limiting unit 44 and replaced separately, without the need to disassemble the entire limiting plate 41, thereby facilitating replacement and maintenance and reducing maintenance costs.

[0028] On the basis of the above-mentioned design of "the stopper 43 is detachably connected to the limiting monomer 44", the specific connection method of the stopper 43 detachably connected to the limiting monomer 44 is optimized and limited. Specifically, in this embodiment, a connection portion 46 is formed by extending from one end of the stopper 43, and the connection portion 46 passes through the limiting monomer 44 and the floating shaft segment 11, and is threadedly connected to the limiting monomer 44 and the floating shaft segment 11. In this way, while the stopper 43 is threadably connected to the limiting monomer 44 through the connection portion 46, the limiting monomer 44 and the floating shaft segment 11 can be further connected in an integrated manner through the connection portion 46, thereby enhancing the tightness of the connection between the limiting disk 41 and the floating shaft segment 11, avoiding radial or axial shaking or displacement of the limiting disk 41 relative to the floating shaft segment 11 during operation, and achieving greater stability.

[0029] In order to reduce the wear of the block 43 itself and the damage to the bracket 2 caused by the circumferential abutment of the block 43, in this embodiment, the structure and connection method of the bracket 2 abutting the block 43 are optimized and limited, specifically as follows: the bracket 2 has a rigid support surface 24 for the block 43 to abut circumferentially and provide circumferential limiting support for the tube axis 1. The rigid support surface 24 is formed in the floating channel 21 and is located on the swinging path of the block 43, ensuring that the block 43 can stably and accurately contact the bracket 2 when swinging. In addition, the rigid support surface 24 fits and extends longitudinally with the block 43, so that when the block 43 follows the longitudinal sliding process of the tube axis 1, that is, when the block 43 dynamically and circumferentially abuts against the bracket 2 longitudinally, the best contact effect and limiting accuracy between the two can be ensured. In addition, the floating drive assembly also includes a protective cover 25, which is connected to the bracket 2 by snapping or bonding, and completely or partially covers the rigid support surface 24, forming a buffer layer for buffering protection on the rigid support surface 24. The buffer layer formed by the protective cover 25 can provide effective buffering when the block 43 contacts the bracket 2, thereby reducing wear and noise.

[0030] On the basis of the above-mentioned design of the protective sleeve 25, in order to make the circumferential limit of the tube axis 1 produced by the "block 43 abutting the bracket 2" more crisp, the steering accuracy is improved. In this embodiment, the material of the protective sleeve 25 is preferably limited, and the protective sleeve 25 is made of an inelastic material. An inelastic material refers to a material that is not easy to deform after being subjected to force, can maintain the original shape and size stability, has high strength, high rigidity and good wear resistance, and can provide stable support and limiting effects when the block 43 contacts the bracket 2. The choice of inelastic materials is diverse. For example, high-density polyethylene (HDPE), polypropylene (PP), nylon (PA) and other polymer materials can be used. These polymer materials can be made into inelastic materials with good wear resistance and corrosion resistance through special treatments such as extrusion and cooling, stretching and orientation, cross-linking treatment, and chemical modification (such as adding fillers, blending modification, using chemical cross-linking agents, etc.).

[0031] The reason why the protective cover 25 is limited to be made of inelastic material is that if the protective cover 25 is made of a material with good elasticity such as rubber or silicone, although it can provide good buffering protection for the rigid support surface 24 (i.e., the bracket 2) and reduce wear and noise, the elastic material will undergo elastic deformation after being subjected to force, which will cause errors in the original circumferential limit angle of the tube axis 1. Although these errors may seem insignificant individually, they will still affect the steering accuracy of the stacker, especially in high-precision steering application scenarios such as unmanned stackers. Steering accuracy is a key factor in ensuring accurate driving and positioning of the vehicle. Since unmanned stackers usually need to automatically navigate and avoid obstacles in narrow spaces, the accuracy requirements of their steering systems are extremely high. Small steering accuracy errors will continue to accumulate during the multiple steering processes of the unmanned stacker, eventually causing the vehicle to deviate from the predetermined driving trajectory, affecting the accuracy and efficiency of the stacking operation.

[0032] In addition to the above structure, in the present embodiment, a thrust ball bearing 26 is slidably positioned at one end of the second guide tube 23 close to the compression spring 12. The thrust ball bearing 26 axially abuts against the compression spring 12 and is used for the floating shaft segment 11 to slidably pass through. The main function of the thrust ball bearing 26 is to bear the axial load, that is, it allows the floating shaft segment 11 to have a certain range of movement in the axial direction, and at the same time can resist the friction generated by such movement. In addition, a locking tube 27 is screwed on the inner wall of the end of the second guide tube 23 away from the indentation. The locking tube 27 can be passed through by the floating shaft segment 11 and is used to axially abut against the thrust ball bearing 26 to lock the compression spring 12. When working, the stacker passes through a steep road surface. When the driving wheel mounting seat 3 transmits the longitudinal supporting force to the tubular shaft 1 and the floating shaft segment 11, the floating shaft segment 11 will slide in the thrust ball bearing 26 under the force, so that the relative distance between the limit plate 41 and the thrust ball bearing 26 changes, causing the compression spring 12 to be squeezed or stretched. The elastic action of the compression spring 12 allows the floating shaft segment 11 to move freely within a certain range, thereby absorbing and buffering the longitudinal supporting force transmitted from the driving wheel mounting seat 3 to the tubular shaft 1. By rotating the locking tube 27 circumferentially, the relative position of the locking tube 27 in the second guide tube 23 is adjusted, the preload force between the thrust ball bearing 26 and the compression spring 12 is changed, and the stiffness and stability of the entire device are adjusted. Specifically, for example, when the locking tube 27 is rotated to move the locking tube 27 toward the compression spring 12 on the second guide tube 23, the bottom of the locking tube 27 can axially abut the thrust ball bearing 26, so that the thrust ball bearing 26 slides toward the compression spring 12, and then squeezes the compression spring 12, thereby enhancing the preload force between the thrust ball bearing 26 and the compression spring 12. Otherwise, it will not be repeated.

[0033] The second guide tube 23 is threadedly connected with a limit screw 28, and the locking tube 27 is provided with at least one limit hole 29 for threading the limit screw 28. During operation, during the installation and adjustment process, the locking tube 27 can be first screwed into the second guide tube 23 until the desired position is reached, and then the limit screw 28 is screwed into the limit hole 29 on the locking tube 27, and the position of the locking tube 27 is fixed by rotation. By adjusting the screwing depth and position of the limit screw 28, the moving range of the locking tube 27 can be accurately controlled, thereby achieving stable support and limitation of components such as the floating shaft section 11 and the thrust ball bearing 26.

[0034] It should be noted that the application scope of the floating drive assembly mentioned in this embodiment is not limited to stacker trucks, but can also be applied to other industrial vehicles in the field of logistics and warehousing, such as transport trucks, reach trucks, tractors, etc. Embodiment 2 A stacker comprises a chassis and a floating drive assembly as shown in the first embodiment, wherein a bracket 2 of the floating drive assembly is connected to the chassis of the stacker.

[0035] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are all included in the patent scope of the present invention.

Claims

1. A floating drive assembly, characterized in that: include: A tubular shaft (1), one end of which is connected to a driving wheel mounting seat (3) and the other end of which is formed with a floating shaft section (11); A support (2) is formed with a floating channel (21) for accommodating the floating shaft section (11); The floating channel (21) extends longitudinally, and a first guide tube (22) and a second guide tube (23) arranged at a higher position relative to the first guide tube (22) are arranged at intervals in the extension path; The floating shaft section (11) is sleeved with a compression spring (12) and is slidably arranged in the first guide tube (22) and the second guide tube (23); A limiting plate (41) is arranged on the floating shaft section (11) and extends radially outward with the floating shaft section (11) as the center; a supporting surface (42) is formed at one end of the limiting plate (41) close to the second guide body, which is used to support the compression spring (12) so that the compression spring (12) axially abuts against the second guide tube (23) to perform longitudinal elastic limiting on the tube axis (1); a stop block (43) is provided on the side wall of the limiting plate (41) to circumferentially abut against the bracket (2) to perform circumferential limiting on the tube axis (1).

2. The floating drive assembly according to claim 1, characterized in that: The limiting plate (41) includes a plurality of limiting monomers (44); the plurality of limiting monomers (44) are connected to each other by fasteners and assembled to form the supporting surface (42) and the connecting groove (45) for radially enclosing and clamping the floating shaft section (11); the stopper (43) is arranged on the limiting monomer (44).

3. The floating drive assembly according to claim 2, characterized in that: The floating shaft section (11) is radially recessed to form two groups of mutually spaced and aligned retaining shoulders (13), and the two groups of retaining shoulders (13) respectively abut against the limiting plate (41) in opposite directions along the length direction of the floating shaft section (11).

4. The floating drive assembly according to claim 2, characterized in that: The stopper (43) is detachably connected to the position limiting unit (44).

5. The floating drive assembly according to claim 4, characterized in that: One end of the stopper (43) passes through the position-limiting monomer (44) and the floating shaft section (11), and is threadedly connected to the position-limiting monomer (44) and the floating shaft section (11).

6. The floating drive assembly according to claim 1, characterized in that: The support (2) has a rigid support surface (24); the rigid support surface (24) is located on the swing path of the stopper (43) and can be adapted to fit and extend longitudinally by the stopper (43); and further comprises a protective cover (25), the protective cover (25) being connected to the support (2) by means of snap connection or bonding, and completely or partially covering the rigid support surface (24), thereby forming a buffer layer for buffering protection on the rigid support surface (24).

7. The floating drive assembly according to claim 6, characterized in that: The protective cover (25) is made of inelastic material.

8. The floating drive assembly according to claim 1, characterized in that: A thrust ball bearing (26) is slidably positioned at one end of the second guide tube (23) close to the compression spring (12); the thrust ball bearing (26) axially abuts against the compression spring (12) and is used for the floating shaft section (11) to slidably pass through; a locking tube (27) is threadedly connected to the inner wall of one end of the second guide tube (23) away from the indentation, and the locking tube (27) can allow the floating shaft section (11) to pass through and is used to axially abut against the thrust ball bearing (26) to lock the compression spring (12).

9. The floating drive assembly according to claim 8, characterized in that: The second guide tube (23) is threadedly connected to a limit screw (28), and the locking tube (27) is provided with at least one limit hole (29) for threaded connection of the limit screw (28).

10. A stacker, characterized in that: It comprises a wheel base and a floating drive assembly as claimed in any one of claims 1 to 9, wherein a bracket (2) of the floating drive assembly is detachably connected to the wheel base.

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