Goods shelf vehicle with middle wheel for braking and positioning

Abstract

The utility model discloses a goods shelf vehicle with a middle wheel for braking and positioning. The goods shelf vehicle comprises a cart base, moving wheels; the at least one brake wheel is assembled in the middle of the bottom plate; the movable braking mechanism is used for stopping the side surface or the wheel surface of the braking wheel in an abutting manner; and a steering brake mechanism. Compared with a common goods shelf vehicle, the moving wheels are matched with the brake wheels arranged in the middle, so that the goods shelf vehicle steers more flexibly, the operation of pushing the goods shelf vehicle to move in multiple directions is more labor-saving, unstable and out-of-control states such as goods shelf drifting caused by the conditions such as braking of the goods shelf vehicle when the goods shelf vehicle carries objects, particularly heavy objects can be avoided, the controllability of the goods shelf vehicle is improved, and the service life of the goods shelf vehicle is prolonged. And the switching between the braking state and the moving state is convenient. The design is matched with the design of various hub braking mechanisms, the design of action areas and the combination of directional and universal moving switching mechanisms, so that the goods shelf vehicle has high adaptability to transportation of different types of goods. And the state switching mechanisms of the multiple brake wheels are uniformly designed, so that the state switching efficiency and stability of the goods shelf vehicle are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shelf vehicles, in particular to a shelf vehicle with intermediate wheel brake positioning. Background Art

[0002] Rack trucks generally need to ensure a large carrying capacity, and this usage requirement also brings many disadvantages. For example, when transporting objects, especially heavy objects, there may be unstable and out-of-control states such as the rack skidding due to the rack truck braking; the moving wheels are mostly set at the corners of the rack truck. Because the bottom plate of the rack truck is under excessive pressure, the movement resistance of the bottom moving wheels is large, and the rack truck is slow to turn and difficult to move; the moving wheels are difficult to quickly switch between directional, universal, braking, and moving states, making the rack truck inconvenient to operate; the switching mechanism design is single, which also makes it poorly adaptable to the transportation needs of different types of goods, and the switching mechanism is generally designed one-to-one with the moving wheels, resulting in low state switching efficiency and stability. Utility Model Content

[0003] The utility model aims to solve the problem of unstable and out-of-control conditions such as tail swinging of the shelf caused by braking of the shelf trolley when carrying objects, especially heavy objects. The moving wheels are mostly arranged at the corners of the shelf trolley. Because the compressive load on the bottom plate of the shelf trolley is too large, the movement resistance of the bottom moving wheels is large, the shelf trolley is sluggish in steering and difficult to move. It is difficult for the moving wheels to quickly switch between directional, universal, braking and moving states, which makes the shelf trolley inconvenient to operate. The switching mechanism is designed in a single way, which also makes it poorly adaptable to the transportation needs of different types of goods. In addition, the switching mechanism is generally designed in a one-to-one correspondence with the moving wheels, which makes the state switching efficiency and stability low. A shelf trolley with intermediate wheel brake positioning is provided.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solution: a shelf vehicle with intermediate wheel brake positioning, comprising:

[0005] A cart base, wherein an activity cavity is provided through the inside thereof, and a bottom plate is provided at the bottom of the activity cavity;

[0006] Moving wheels, which are mounted at the corners of the bottom plate;

[0007] At least one brake wheel, which is mounted on the middle part of the bottom plate, and comprises a hub frame rotatably connected to the brake wheel, and a mounting seat rotatably connected to the hub frame through a bearing seat, wherein the mounting seat is mounted on the bottom plate;

[0008] A mobile brake mechanism, which is arranged in the movable chamber, comprises a plurality of first locking members and a first linkage mechanism associated with at least two of the first locking members, wherein the first locking member comprises a first linkage rod movably arranged on the brake wheel and a brake member connected to the first linkage rod, wherein the brake member abuts against the side surface or wheel surface of the brake wheel to stop the brake wheel;

[0009] The steering brake mechanism is arranged in the movable cavity, and includes a plurality of second locking members and a second linkage mechanism associated with at least two of the second locking members. A steering lock disk is arranged on the brake wheel, and a card slot corresponding to the card block of the second locking member is arranged on the steering lock disk.

[0010] As a further description of the above technical solution:

[0011] The first linkage rod is slidably arranged in the guide seat, the guide seat is embedded and assembled in the wheel hub frame, the bearing seat and the mounting seat, and the positioning nut on the first linkage rod is used to connect and limit the brake member.

[0012] As a further description of the above technical solution:

[0013] The middle part of the brake component is connected to the wheel hub frame through a first hinge shaft, and a second hinge shaft is also arranged on the wheel hub frame. The second hinge shaft limits the limiting ear at the end of the brake component, and a reset torsion spring is also arranged between the second hinge shaft and the brake component. A clamping plate extends from the side of the brake component, and the clamping plate is clamped on the toothed structure on the side of the brake wheel.

[0014] As a further description of the above technical solution:

[0015] The toothed structure is arranged along the circumference of the brake wheel and extends outwardly toward the axial direction thereof, or is arranged along the circumference of the inner wall of the concave structure on the side of the brake wheel and extends toward the axis thereof.

[0016] As a further description of the above technical solution:

[0017] The middle part of the brake component is connected to the wheel hub frame through a fourth hinge seat, the first linkage rod is located at one side of the fourth hinge seat, and a brake pad is extended downward from the bottom of the brake component.

[0018] As a further description of the above technical solution:

[0019] The first linkage mechanism includes a second lever rotatably connected to the base plate through a second hinge seat and a first lever associated with the first locking member and the second lever, the first lever being rotatably connected to the base plate through a first hinge seat, a side plate extending from the end of the first lever, the first linkage rod passing through the side plate, a limit seat being arranged on the top of the first linkage rod, a first return spring being arranged between the limit seat and the side plate, a plurality of first guide columns being arranged on both sides of the first lever, a connecting plate being arranged at the end of the second lever, an adjusting column extending from the connecting plate, and the adjusting column being slidably connected to the first waist-shaped hole of the first lever.

[0020] As a further description of the above technical solution:

[0021] The bottom plate is also rotatably connected with a third lever via a third hinge seat, and the third lever abuts against the end of the second lever.

[0022] As a further description of the above technical solution:

[0023] The second waist-shaped hole on the second locking piece is slidably connected to the end of the second linkage mechanism, the bottom of the second locking piece is inserted into the movable hole of the bottom plate, a spring seat extends from the movable hole, the second locking piece is hinged on the spring seat, and a tension spring is arranged between the top of the second locking piece and the spring seat.

[0024] As a further description of the above technical solution:

[0025] The annular segment-shaped steering lock disk is arranged outside the bearing seat, a stopper is arranged at the end of the steering lock disk, the angle formed by the axes of the two stoppers is 90° or 180°, and the slot is located between the two stoppers.

[0026] As a further description of the above technical solution:

[0027] The second linkage mechanism includes a fourth lever whose end is rotatably connected to the base plate through a fifth hinge seat and a second linkage rod connected to the fourth lever through a third guide column. A second guide column and a second return spring are arranged between the base plate and the fourth lever. A limit plate is arranged on the outer side of the third guide column of the second linkage rod. The second linkage rod is slidably arranged on the guide plate of the base plate. The second linkage rod is connected to the second locking piece.

[0028] In summary, due to the adoption of the above technical solution, the utility model has the following advantages compared with the prior art:

[0029] Beneficial effects:

[0030] The rack cart uses the mobile wheels in conjunction with the brake wheels set in the middle to make its steering more flexible and its multi-directional movement operation more labor-saving. It can also avoid unstable and out-of-control conditions such as the shelf swinging due to the brakes of the rack cart when carrying objects, especially heavy objects, thereby improving the controllability of the rack cart and the convenience of switching between the brake and mobile states. The above design is combined with a combination of multiple wheel hub brake mechanisms and action area designs as well as directional and universal mobile switching mechanisms, making the rack cart highly adaptable to the transportation of different types of goods. The state switching mechanisms of multiple brake wheels are uniformly designed to improve the efficiency and stability of the state switching of the rack cart. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 The front view of a shelf truck with intermediate wheel brake positioning.

[0033] Figure 2 A schematic diagram of an embodiment of the assembly structure of the brake wheel and the bottom plate of a shelf vehicle with a middle wheel brake positioning Figure 1 .

[0034] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0035] Figure 4 A schematic diagram of an embodiment of the assembly structure of the brake wheel and the bottom plate of a shelf vehicle with a middle wheel brake positioning Figure 2 .

[0036] Figure 5 The invention is an exploded view of a certain embodiment of the assembly structure of the brake wheel, the first locking member and the second locking member in a shelf vehicle with intermediate wheel brake positioning.

[0037] Figure 6 The exploded view of another embodiment of the assembly structure of the brake wheel and the first locking member in a shelf vehicle with intermediate wheel brake positioning.

[0038] Figure 7 The exploded view of another embodiment of the assembly structure of the brake wheel and the second locking member in a shelf vehicle with intermediate wheel brake positioning.

[0039] Figure 8 The present invention is a structural schematic diagram of another embodiment of the assembly structure of the brake wheel and the bottom plate of a shelf vehicle with intermediate wheel brake positioning.

[0040] Legend:

[0041] 1. Cart base; 11. Activity cavity; 12. Bottom plate; 121. First hinge seat; 122. First guide post; 123. Second hinge seat; 124. Activity hole; 125. Spring seat; 126. Guide plate; 127. Fifth hinge seat; 128. Second guide post; 129. Third hinge seat; 2. Moving wheel; 3. Brake wheel; 30. Tooth structure; 31. Hub frame; 311. First hinge shaft; 312. Second hinge shaft; 32. Bearing seat; 33. Mounting seat; 34. Guide seat; 35. Steering lock plate; 351. Block; 352. Slot; 4. Moving brake mechanism; 41. First locking member; 411. Brake member; 4111. Limiting member Ear; 4112, return torsion spring; 4113, fourth articulated seat; 4114, brake pad; 412, card plate; 413, first linkage rod; 414, positioning nut; 415, limit seat; 416, first return spring; 42, first lever; 421, side plate; 422, first waist-shaped hole; 43, second lever; 431, connecting plate; 432, adjusting column; 44, third lever; 5, steering brake mechanism; 51, second locking piece; 511, card block; 512, second waist-shaped hole; 513, tension spring; 52, second linkage rod; 521, limit plate; 53, fourth lever; 531, third guide column; 532, second return spring; 6, stand. DETAILED DESCRIPTION

[0042] 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 of 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.

[0043] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0044] Embodiment 1:

[0045] See also Figure 1-8 The utility model provides a technical solution: a shelf vehicle with intermediate wheel brake positioning, comprising:

[0046] The cart base 1 has an activity cavity 11 extending therethrough, and a bottom plate 12 is disposed at the bottom of the activity cavity 11. In this embodiment, a stand 6 is detachably mounted on the cart base 1, and a crossbeam for placing a carrier is disposed on the stand 6, and the carrier can be used to place objects.

[0047] Moving wheels 2, which are mounted at the corners of the bottom plate 12;

[0048] At least one brake wheel 3, which is mounted in the middle of the bottom plate 12, and includes a hub frame 31 rotatably connected to the brake wheel 3, and a mounting seat 33 rotatably connected to the hub frame 31 through a bearing seat 32, and the mounting seat 33 is mounted on the bottom plate 12;

[0049] A mobile brake mechanism 4, which is arranged in the movable chamber 11, comprises a plurality of first locking members 41 and a first linkage mechanism associated with at least two of the first locking members 41, wherein the first locking member 41 comprises a first linkage rod 413 movably arranged on the brake wheel 3 and a brake member 411 connected to the first linkage rod 413, wherein the brake member 411 abuts against the side surface or wheel surface of the brake wheel 3 to stop the brake wheel 3;

[0050] The steering brake mechanism 5 is arranged in the active cavity 11, and includes a plurality of second locking members 51 and a second linkage mechanism associated with at least two of the second locking members 51. A steering lock disk 35 is arranged on the brake wheel 3, and a card slot 352 corresponding to the card block 511 of the second locking member 51 is arranged on the steering lock disk 35.

[0051] The rack cart uses the mobile wheels in conjunction with the brake wheels set in the middle to make its steering more flexible and its multi-directional movement operation more labor-saving. It can also avoid unstable and out-of-control conditions such as the shelf swinging due to the brakes of the rack cart when carrying objects, especially heavy objects, thereby improving the controllability of the rack cart and the convenience of switching between the brake and mobile states. The above design is combined with a combination of multiple wheel hub brakes and directional and universal mobile switching mechanisms, making the rack cart highly adaptable to the transportation of different types of goods. The state switching mechanisms of multiple brake wheels are uniformly designed to improve the efficiency and stability of the state switching of the rack cart.

[0052] Among them, the connection structure between the first linkage rod 413 and the brake wheel 3 is specifically as follows: the first linkage rod 413 is slidably inserted into the guide seat 34, and the guide seat 34 is embedded and assembled in the wheel hub frame 31, the bearing seat 32 and the mounting seat 33. The positioning nut 414 on the first linkage rod 413 connects and limits the brake component 411, thereby improving the structural stability of the brake wheel 3 and ensuring the switching of stable operation, directional, universal and brake states.

[0053] In order to ensure efficient and stable linkage of braking and moving switching operations of multiple braking wheels 3, the specific structure of the first linkage mechanism is as follows: the first linkage mechanism includes a second lever 43 rotatably connected to the base plate 12 through a second hinge seat 123 and a first lever 42 associated with the first locking piece 41 and the second lever 43, the first lever 42 is rotatably connected to the base plate 12 through the first hinge seat 121, a side plate 421 extends from the end of the first lever 42, the first linkage rod 413 is penetrated by the side plate 421, a limit seat 415 is arranged on the top of the first linkage rod 413, a first return spring 416 is arranged between the limit seat 415 and the side plate 421, a plurality of first guide columns 122 are arranged on both sides of the first lever 42 of the base plate 12, a connecting plate 431 is arranged at the end of the second lever 43, an adjusting column 432 extends from the connecting plate 431, and the adjusting column 432 is slidably connected to the first waist-shaped hole 422 of the first lever 42. The second lever 43 should extend out of the bottom plate 12, such as by opening a through hole at the top of the active cavity 11, so that the second lever 43 can extend therefrom, so as to operate the first linkage mechanism and make it stable and fully linked.

[0054] Among them, the assembly structure of the second locking member 51, the second linkage mechanism and the base plate 12 is specifically as follows: the second waist-shaped hole 512 on the second locking member 51 is slidably connected to the end of the second linkage mechanism, the bottom of the second locking member 51 is inserted into the movable hole 124 of the base plate 12, and a spring seat 125 extends from the movable hole 124. The second locking member 51 is hinged on the spring seat 125, and a tension spring 513 is arranged between the top of the second locking member 51 and the spring seat 125. Through the above design, interference-free linkage during operation and self-resetting of the structure after operation are achieved, thereby improving the convenience of operation of the linkage mechanism.

[0055] The second linkage mechanism includes a fourth lever 53 whose end is rotatably connected to the base plate 12 via a fifth hinge seat 127 and a second linkage rod 52 connected to the fourth lever 53 via a third guide column 531, a second guide column 128 and a second return spring 532 are arranged between the base plate 12 and the fourth lever 53, a limit plate 521 is arranged on the outer side of the third guide column 531 of the second linkage rod 52, the second linkage rod 52 is slidably arranged on the guide plate 126 of the base plate 12, and the second linkage rod 52 is connected to the second locking member 51.

[0056] See also Figure 2When the above structure brakes the shelf truck, the second lever 43 is pulled up or pressed down to move away from one end of the first lever 42, so that the first lever 42 rotates synchronously, and its inner end slides adaptively along the first waist-shaped hole 422, and the outer end of the first lever 42 moves up or down to pull up or down the first linkage rod 413 accordingly, so that the brake member 411 contacts the wheel surface or side surface of the brake wheel 3 to brake, thereby achieving synchronous braking of multiple brake wheels 3 and improving the braking efficiency of the shelf truck.

[0057] See also Figure 4 When performing steering lock and directional movement, adjust the direction of the brake wheel 3 so that the slot 352 is opposite to the block 511, pull the fourth lever 53, so that the second linkage rod 52 moves up synchronously, and the second locking member 51 rotates, and the block 511 is connected to the slot 352, so that the shelf vehicle with multiple brake wheels linked can be switched from the universal to the directional movement state, and the operation is quick.

[0058] Embodiment 2:

[0059] See also Figure 2 , 4 5. On the basis of the above-mentioned embodiment 1, preferably, the middle part of the brake member 411 is connected to the hub frame 31 through the first hinge shaft 311, and the hub frame 31 is also provided with a second hinge shaft 312, and the second hinge shaft 312 limits the limiting ear 4111 at the end of the brake member 411, and a reset torsion spring 4112 is also provided between the second hinge shaft 312 and the brake member 411, and a clamping plate 412 extends from the side of the brake member 411, and the clamping plate 412 is clamped on the toothed structure 30 on the side of the brake wheel 3.

[0060] The toothed structure 30 is arranged circumferentially along the brake wheel 3 and extends outwardly toward the axial direction thereof, or is arranged circumferentially along the inner wall of the concave structure on the side of the brake wheel 3 and extends toward the axis thereof.

[0061] The above structure realizes the circumferential locking of the brake wheel by the rotating clamping plate 412 and the toothed structure 30 arranged in the form of inner teeth or outer teeth on the side of the brake wheel. When the brake member 411 is linked to rotate toward or away from the brake wheel 3, the clamping plate 412 is clamped on the inner teeth or outer teeth of the toothed structure 30 at the corresponding position, realizing structural locking and stopping the rack truck.

[0062] Embodiment three:

[0063] See also Figure 6 On the basis of the above-mentioned embodiment 1, preferably, the middle part of the brake member 411 is connected to the wheel hub frame 31 through a fourth hinge seat 4113, the first linkage rod 413 is located on one side of the fourth hinge seat 4113, and a brake pad 4114 extends downward from the bottom of the brake member 411.

[0064] The above design stops the brake wheel 3 by the contact between the rotating clamping plate 412 and the wheel surface of the brake wheel 3. Specifically, when the brake member 411 is linked to one side and rotates toward the brake wheel 3, the brake pad 4114 contacts the wheel surface of the brake wheel 3 to achieve friction stop.

[0065] Embodiment 4:

[0066] See also Figure 1 , 3 On the basis of the above embodiment 1, preferably, the bottom plate 12 is further rotatably connected with a third lever 44 via a third hinge seat 129, and the third lever 44 abuts against the end of the second lever 43. The above structure can improve the convenience of operation of the first linkage mechanism and ensure sufficient cargo carrying capacity of the shelf vehicle, so that the cargo will not interfere with the first linkage mechanism.

[0067] Embodiment five:

[0068] See also Figure 1-8 On the basis of the above-mentioned embodiment 1, preferably, the annular segment-shaped steering lock disk 35 is arranged outside the bearing seat 32, and a stopper 351 is arranged at the end of the steering lock disk 35. The angle formed by the axes of the two stoppers 351 is 90° or 180°, and the slot 352 is located between the two stoppers 351. The above-mentioned design enables the shelf truck to stably move along one axis direction when the brake wheel is in the directional state, and the shelf truck can be limited by the stopper 351 in the universal state, and can move stably in one direction or two directions along the other axis direction, thereby making the operation of the shelf truck more convenient, labor-saving, stable and controllable. In addition, the steering lock disk 35 is formed as a whole by one-time stamping, which is convenient for mass production.

[0069] In summary, due to the adoption of the above technical solution, the intermediate wheel brake positioning rack vehicle of this embodiment has the following beneficial effects compared with the prior art:

[0070] The rack cart uses the mobile wheels in conjunction with the brake wheels set in the middle to make its steering more flexible and its multi-directional movement operation more labor-saving. It can also avoid unstable and out-of-control conditions such as the shelf swinging due to the brakes of the rack cart when carrying objects, especially heavy objects, thereby improving the controllability of the rack cart and the convenience of switching between the brake and mobile states. The above design is combined with a combination of multiple wheel hub brake mechanisms and action area designs as well as directional and universal mobile switching mechanisms, making the rack cart highly adaptable to the transportation of different types of goods. The state switching mechanisms of multiple brake wheels are uniformly designed to improve the efficiency and stability of the state switching of the rack cart.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A shelf vehicle with intermediate wheel brake positioning, characterized in that: include: A cart base, an activity cavity is provided inside the base, and a bottom plate is provided at the bottom of the activity cavity; Moving wheels, which are mounted at the corners of the bottom plate; At least one brake wheel, which is mounted on the middle part of the bottom plate, and comprises a hub frame rotatably connected to the brake wheel, and a mounting seat rotatably connected to the hub frame through a bearing seat, wherein the mounting seat is mounted on the bottom plate; A mobile brake mechanism is arranged in the movable chamber, comprising a plurality of first locking members and a first linkage mechanism associated with at least two of the first locking members, wherein the first locking member comprises a first linkage rod movably arranged on the brake wheel and a brake member connected to the first linkage rod, wherein the brake member abuts against the side surface or wheel surface of the brake wheel to stop the brake wheel: The steering brake mechanism is arranged in the movable cavity, and includes a plurality of second locking members and a second linkage mechanism associated with at least two of the second locking members. A steering lock disk is arranged on the brake wheel, and a card slot corresponding to the card block of the second locking member is arranged on the steering lock disk.

2. A shelf vehicle with intermediate wheel brake positioning according to claim 1, characterized in that: The first linkage rod is slidably arranged in the guide seat, the guide seat is embedded and assembled in the wheel hub frame, the bearing seat and the mounting seat, and the positioning nut on the first linkage rod is used to connect and limit the brake member.

3. The intermediate wheel brake positioning rack vehicle according to claim 1, characterized in that: The middle part of the brake component is connected to the wheel hub frame through a first hinge shaft, and a second hinge shaft is also arranged on the wheel hub frame. The second hinge shaft limits the limiting ear at the end of the brake component, and a reset torsion spring is also arranged between the second hinge shaft and the brake component. A clamping plate extends from the side of the brake component, and the clamping plate is clamped on the toothed structure on the side of the brake wheel.

4. A shelf vehicle with intermediate wheel brake positioning according to claim 3, characterized in that: The toothed structure is arranged along the circumference of the brake wheel and extends outwardly toward the axial direction thereof, or is arranged along the circumference of the inner wall of the concave structure on the side of the brake wheel and extends toward the axis thereof.

5. The intermediate wheel brake positioning rack vehicle according to claim 1, characterized in that: The middle part of the brake component is connected to the hub frame through a fourth hinge seat, the first linkage rod is located at one side of the fourth hinge seat, and a brake pad is extended downward from the bottom of the brake component.

6. The intermediate wheel brake positioning rack vehicle according to claim 1, characterized in that: The first linkage mechanism includes a second lever rotatably connected to the base plate through a second hinge seat and a first lever associated with the first locking member and the second lever, the first lever being rotatably connected to the base plate through a first hinge seat, a side plate extending from the end of the first lever, the first linkage rod passing through the side plate, a limit seat being arranged on the top of the first linkage rod, a first return spring being arranged between the limit seat and the side plate, a plurality of first guide columns being arranged on both sides of the first lever, a connecting plate being arranged at the end of the second lever, an adjusting column extending from the connecting plate, and the adjusting column being slidably connected to the first waist-shaped hole of the first lever.

7. A shelf vehicle with intermediate wheel brake positioning according to claim 6, characterized in that: The bottom plate is also rotatably connected with a third lever via a third hinge seat, and the third lever abuts against the end of the second lever.

8. The intermediate wheel brake positioning rack vehicle according to claim 1, characterized in that: The second waist-shaped hole on the second locking piece is slidably connected to the end of the second linkage mechanism, the bottom of the second locking piece is inserted into the movable hole of the bottom plate, a spring seat extends from the movable hole, the second locking piece is hinged on the spring seat, and a tension spring is arranged between the top of the second locking piece and the spring seat.

9. The intermediate wheel brake positioning rack vehicle according to claim 1, characterized in that: The annular segment-shaped steering lock disk is arranged outside the bearing seat, a stopper is arranged at the end of the steering lock disk, the angle formed by the axes of the two stoppers is 90° or 180°, and the slot is located between the two stoppers.

10. The intermediate wheel brake positioning shelf vehicle according to claim 1, characterized in that: The second linkage mechanism includes a fourth lever whose end is rotatably connected to the base plate through a fifth hinge seat and a second linkage rod connected to the fourth lever through a third guide column. A second guide column and a second return spring are arranged between the base plate and the fourth lever. A limit plate is arranged on the outer side of the third guide column of the second linkage rod. The second linkage rod is slidably arranged on the guide plate of the base plate. The second linkage rod is connected to the second locking piece.

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