Pallet fork applied to narrow space

Abstract

The utility model discloses a pallet fork which comprises a group of upper fork assemblies, a group of middle fork assemblies and a group of lower fork assemblies, the upper fork assemblies are arranged above the middle fork assemblies and connected with the middle fork assemblies, the middle fork assemblies are arranged above the lower fork assemblies and connected with the lower fork assemblies, and the lower fork assemblies are connected through universal shafts. And the driving assembly is arranged between the lower fork assemblies and is connected with the lower fork assemblies. The pallet fork applied to the narrow and small space is simple in structure, reasonable in design, small in occupied space, capable of stably stretching out and drawing back to achieve taking and placing of goods, high in positioning accuracy and convenient and fast to fork and take the goods.

Description

Technical Field

[0001] The utility model belongs to the field of telescopic fork manufacturing, in particular to a cargo fork used in a narrow space. Background Art

[0002] Telescopic forks are generally used for stacking goods on pallets or boxes, and the telescopic forks pick up goods from the bottom of the pallets or boxes. However, with the diversification of the application fields of telescopic forks, some special picking scenarios with relatively small fork entry space have also emerged. For example, when picking up battery boxes in the new energy industry, or paper rolls and steel coils, the space from the side of the goods to the side of the shelf is narrow, and it is not convenient to fork the goods, which requires high telescopic forks. In view of such application scenarios, the utility model provides a fork for use in narrow spaces, which saves space while ensuring good mechanical properties. Utility Model Content

[0003] Purpose of the utility model: In order to overcome the above shortcomings, the purpose of the utility model is to provide a fork for use in a narrow space, which has a simple structure, reasonable design, small space occupancy, can be smoothly extended and retracted to achieve the picking and placing of goods, has high positioning accuracy, and is convenient and quick to fork the goods.

[0004] Technical solution: In order to achieve the above purpose, the utility model provides a fork for use in a narrow space, comprising:

[0005] The fork comprises an upper fork assembly, a middle fork assembly and a lower fork assembly, wherein the upper fork assembly is arranged above the middle fork assembly and connected to the middle fork assembly, the middle fork assembly is arranged above the lower fork assembly and connected to the lower fork assembly, and the lower fork assemblies are connected via a universal shaft;

[0006] The driving assembly is arranged between the lower fork assemblies and connected with the lower fork assemblies. The utility model has a simple structure, a reasonable design, and a small space occupation. It can be stably extended and retracted to realize the taking and placing of goods, has high positioning accuracy, and is convenient and fast to fork the goods.

[0007] The upper fork assembly includes an upper fork, a group of upper fork rollers, and a group of upper fork guide blocks. The upper fork is arranged in a T-shape, the upper fork rollers are arranged at intervals on both sides of the upper fork and connected to the upper fork, and the upper fork guide blocks are arranged between the upper fork rollers and connected to the upper fork. The upper fork can stably and reliably pick up goods, greatly reducing space occupation and improving the applicability of the fork.

[0008] Furthermore, the middle fork assembly includes a middle fork, a gear group, and a middle fork rack. The gear group is arranged at intervals on both sides of the middle fork and is connected to the middle fork. The middle fork rack is arranged on the lower side of the middle fork and is connected to the middle fork. Upper fork roller tracks are arranged on both sides of the middle fork, and lower fork roller tracks are arranged on both sides.

[0009] Furthermore, the lower fork assembly includes a group of lower forks, a transmission gear, a group of lower fork rollers, and a group of lower fork guide blocks. The lower forks are arranged relatively, the transmission gear is arranged inside the lower fork and connected to the fixed plate below the lower fork, the lower fork rollers are arranged inside the lower fork at a relative interval and are located above the transmission gear, the lower fork guide blocks are arranged between the lower fork rollers and connected to the lower fork, the middle fork assembly is arranged between the two lower forks, and the transmission gear is meshed with the middle fork rack. The upper fork assembly, the middle fork assembly and the lower fork assembly are freely retractable, and can stably fork and pick up goods, thereby improving the accuracy of picking and placing goods and improving the efficiency of picking and placing goods.

[0010] Preferably, the driving assembly includes a motor, a torque limiter, a gear shaft, a sprocket and a universal shaft. The motor is arranged between the lower fork assemblies and is installed on the lower fork on one side through a motor fixing seat. The universal shaft is arranged on the lower fork away from the motor. The torque limiter is arranged at the output end of the motor, the gear shaft is arranged at the end of the universal shaft close to the motor, and the sprocket is arranged on the outside of the gear shaft and is connected to the driving sprocket on the torque limiter through a chain.

[0011] In addition, it also includes a tensioner, which includes a tensioning seat, a tensioning head, a screw, a sleeve, a compression spring and a fixed block. The tensioning seat is arranged on the lower fork assembly, and the tensioning head is arranged on the tensioning seat and connected to the fixed seat on the tensioning seat through a screw, and a sleeve is provided on the screw at the outside of the fixed seat, and a compression spring is provided in the sleeve. The fixed block is installed on the upper fork assembly, and the fixed block is connected to the tensioning head and the plate chain.

[0012] Furthermore, the middle fork assembly also includes a roller sprocket assembly and a roller chain, the roller sprocket assembly is arranged on the middle fork, and the roller chain is wrapped around the middle fork and the roller sprocket assembly and meshed with the lower fork rack.

[0013] Preferably, the upper fork assembly further comprises at least one upper fork rack, the upper fork rack being arranged at the lower side of the upper fork and connected to the upper fork, and the upper fork rack being meshed with the roller chain;

[0014] The lower fork assembly also includes a lower fork rack, which is arranged on one side of the transmission gear and connected to the lower fork.

[0015] Further preferably, the upper fork rack and the lower fork rack can be short racks or full racks.

[0016] In addition, the roller sprocket assembly includes a group of first screws, pins, bearings, roller sprockets and fixed plates. The first screws are arranged relatively to each other, one end is connected by a pin, and the other end is provided with a fixed plate; the roller sprocket is connected to the pin through a bearing, and the fixed plate is connected to the end of the middle fork.

[0017] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0018] 1. The cargo fork provided by the utility model for use in a narrow space has a simple structure, a reasonable design, and a small space occupation. It can be stably extended and retracted to realize the picking and placing of cargoes, has a high positioning accuracy, and is convenient and quick to pick up cargoes.

[0019] 2. The fork provided by the utility model is used in a narrow space. The upper fork can pick up goods stably and reliably, greatly reducing the space occupied and improving the applicability of the fork. The upper fork assembly, the middle fork assembly and the lower fork assembly can be freely extended and retracted, and can stably pick up goods, thereby improving the accuracy of picking up and placing goods and improving the efficiency of picking up and placing.

[0020] 3. The fork provided by the utility model for use in narrow spaces has a stable fit between the middle fork and the upper fork, high structural strength, convenient installation, and quick and labor-saving fork picking. The matching structure of the rack and pinion ensures the stability of the fork movement and improves the efficiency of forking goods. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the fork used in a narrow space according to the utility model;

[0022] Figure 2 This is a schematic diagram of an upper fork assembly of a fork used in a narrow space according to the utility model;

[0023] Figure 3 It is a schematic diagram of the middle fork assembly in the utility model;

[0024] Figure 4 It is a structural schematic diagram of the lower fork assembly of the utility model;

[0025] Figure 5 It is a schematic diagram of the driving component in the utility model;

[0026] Figure 6 It is a structural schematic diagram of the tensioner in the utility model;

[0027] Figure 7 It is a schematic diagram of a further improved fork used in a narrow space in the utility model;

[0028] Figure 8 It is a structural schematic diagram of a further improved upper fork assembly in the utility model;

[0029] Fig. 9 It is a structural schematic diagram of the roller sprocket assembly in the utility model;

[0030] Fig.10 It is a structural schematic diagram of a further improved lower fork assembly in the utility model;

[0031] Fig.11This is a schematic diagram of the structure of a fork that uses a full rack and is used in a narrow space in the utility model;

[0032] Fig.12 It is a structural schematic diagram of a further improved upper fork assembly in the utility model;

[0033] In the figure: upper fork assembly 1, middle fork assembly 2, lower fork assembly 3, universal shaft 4, drive assembly 5, upper fork 11, upper fork roller 12, upper fork guide block 13, middle fork 21, a group of gear sets 22, middle fork rack 23, upper fork roller track 24, lower fork roller track 25, lower fork 31, transmission gear 32, lower fork roller 33, lower fork guide block 34, motor 51, torque limiter 52, gear shaft 53, sprocket 54, universal shaft 55, leaf chain 57, tensioner 6, tensioning seat 61, tensioning head 62, screw 63, sleeve 64, compression spring 65, fixing block 66. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] like Figures 1 to 6 A fork for use in a narrow space includes:

[0037] The fork comprises an upper fork assembly 1, a middle fork assembly 2 and a lower fork assembly 3. The upper fork assembly 1 is arranged above the middle fork assembly 2 and connected to the middle fork assembly 2. The middle fork assembly 2 is arranged above the lower fork assembly 3 and connected to the lower fork assembly 3. The lower fork assemblies 3 are connected via a universal shaft 4.

[0038] The driving assembly 5 is disposed between the lower fork assemblies 3 and connected to the lower fork assemblies 3 .

[0039] like Figure 2 The upper fork assembly 1 shown includes an upper fork 11, a group of upper fork rollers 12, and a group of upper fork guide blocks 13. The upper fork 11 is arranged in a T shape, the upper fork rollers 12 are arranged at intervals on both sides of the upper fork 11, and are connected to the upper fork 11, and the upper fork guide blocks 13 are arranged between the upper fork rollers 12 and are connected to the upper fork 11.

[0040] like Figure 3 The middle fork assembly 2 shown includes a middle fork 21, a gear set 22, and a middle fork rack 23. The gear set 22 is arranged at intervals on both sides of the middle fork 21 and is connected to the middle fork 21. The middle fork rack 23 is arranged on the lower side of the middle fork 21 and is connected to the middle fork 21. Upper fork roller tracks 24 are arranged on both sides of the middle fork 21, and lower fork roller tracks 25 are arranged on both sides.

[0041] like Figure 4The lower fork assembly 3 shown includes a group of lower forks 31, a transmission gear 32, a group of lower fork rollers 33, and a group of lower fork guide blocks 34. The lower forks 31 are relatively arranged, and the transmission gear 32 is arranged on the inner side of the lower fork 31 and is connected to the fixed plate below the lower fork 31. The lower fork rollers 33 are relatively spaced and arranged on the inner side of the lower fork 31 and are located above the transmission gear 32. The lower fork guide blocks 34 are arranged between the lower fork rollers 33 and are connected to the lower fork 31. The middle fork assembly 2 is arranged between the two lower forks 31, and the transmission gear 32 is meshed with the middle fork rack 23.

[0042] like Figure 5 The drive assembly 5 shown includes a motor 51, a torque limiter 52, a gear shaft 53, a sprocket 54 and a universal shaft 55. The motor 51 is arranged between the lower fork assemblies 3 and is installed on the lower fork 31 on one side through a motor fixing seat. The universal shaft 55 is arranged on the lower fork 31 away from the motor 51. The torque limiter 52 is arranged at the output end of the motor 51. The gear shaft 53 is arranged at one end of the universal shaft 50 close to the motor 51. The sprocket 54 is arranged on the outside of the gear shaft 53 and is connected to the active sprocket on the torque limiter 52 through a chain.

[0043] Example 2

[0044] The structure of a fork used in a narrow space described in this embodiment is the same as that of embodiment 1. In addition, this embodiment also includes a tensioner 6, which includes a tensioning seat 61, a tensioning head 62, a screw 63, a sleeve 64, a compression spring 65 and a fixing block 66. Figure 6 The tensioning seat 61 shown is arranged on the lower fork assembly 3, the tensioning head 62 is arranged on the tensioning seat 61, and is connected to the fixed seat on the tensioning seat 61 through a screw 63, and a sleeve 64 is provided on the screw 63 on the outside of the fixed seat, and a compression spring 65 is provided in the sleeve 64, the fixed block 66 is installed on the upper fork assembly 1, and the fixed block 66 is connected to the tensioning head 62 and the plate chain 57.

[0045] The working principle of a fork used in a narrow space described in this embodiment is as follows: the motor 51 is started in the forward direction, and the motor 51 drives the torque limiter 52 to rotate. The torque limiter 52 is connected to the sprocket 54 through a chain transmission, so when the torque limiter 52 rotates, the sprocket 54 will be driven to rotate together, and when the sprocket 54 rotates, the gear shaft 53 will be driven to rotate together. Since the lower fork assemblies 3 are connected through the universal shaft 4, the two forks can be operated synchronously;

[0046] Since the gear shaft 53 is meshed with the transmission gear 32, the rotation of the gear shaft 53 will drive the transmission gear 32 to rotate together, and the gear of the transmission gear 32 is meshed with the rack 23, so the middle fork assembly 2 extends;

[0047] Since the tensioner 6 is partially installed on the lower fork assembly 3 and partially installed on the upper fork assembly 1, and these two parts are connected to the leaf chain 57, when the middle fork assembly 2 is extended, the upper fork assembly 1 and the leaf chain 57 are similar to the principle of a movable pulley, so the upper fork assembly 1 is also extended in the same direction at twice the speed. In addition, since the upper fork roller 12 and the upper fork guide block 13 are in the upper fork roller track 24, and the lower fork roller 33 and the lower fork guide block 34 are in the lower fork roller track 25, the degrees of freedom in the vertical direction and the left and right directions are constrained, so that the upper fork assembly 1 and the middle fork assembly 2 can smoothly extend to pick up or put down goods and return to the center.

[0048] Example 3

[0049] The fork used in a narrow space as shown in the figure described in this embodiment includes:

[0050] The fork comprises an upper fork assembly 1, a middle fork assembly 2 and a lower fork assembly 3. The upper fork assembly 1 is arranged above the middle fork assembly 2 and connected to the middle fork assembly 2. The middle fork assembly 2 is arranged above the lower fork assembly 3 and connected to the lower fork assembly 3. The lower fork assemblies 3 are connected via a universal shaft 4.

[0051] The driving assembly 5 is disposed between the lower fork assemblies 3 and connected to the lower fork assemblies 3 .

[0052] The upper fork assembly 1 includes an upper fork 11, a group of upper fork rollers 12, and a group of upper fork guide blocks 13. The upper fork 11 is arranged in a T shape, the upper fork rollers 12 are arranged at intervals on both sides of the upper fork 11 and are connected to the upper fork 11, and the upper fork guide blocks 13 are arranged between the upper fork rollers 12 and are connected to the upper fork 11.

[0053] The middle fork assembly 2 includes a middle fork 21, a gear set 22, and a middle fork rack 23. The gear set 22 is arranged at intervals on both sides of the middle fork 21 and connected to the middle fork 21. The middle fork rack 23 is arranged on the lower side of the middle fork 21 and connected to the middle fork 21. The middle fork 21 has upper fork roller tracks 24 on both sides, and lower fork roller tracks 25 on both sides. The middle fork assembly 2 also includes a roller sprocket assembly 26 and a roller chain 27. The roller sprocket assembly 26 is arranged on the middle fork 21. The roller chain 27 surrounds the middle fork 21 and the roller sprocket assembly 26 and meshes with the lower fork rack 35.

[0054] like Fig. 9 The roller sprocket assembly 26 shown includes a group of first screw rods 261, pin shafts 262, bearings 263, roller sprockets 264 and fixing plates 265. The first screw rods 261 are arranged relatively to each other, one end of which is connected by the pin shaft 262, and the other end is provided with a fixing plate 265; the roller sprocket 264 is connected to the pin shaft 262 by the bearing 263, and the fixing plate 265 is connected to the end of the middle fork 21.

[0055] The lower fork assembly 3 includes a group of lower forks 31, a transmission gear 32, a group of lower fork rollers 33, and a group of lower fork guide blocks 34. The lower forks 31 are relatively arranged, and the transmission gear 32 is arranged on the inner side of the lower fork 31 and connected to the fixed plate below the lower fork 31. The lower fork rollers 33 are relatively spaced and arranged on the inner side of the lower fork 31 and are located above the transmission gear 32. The lower fork guide blocks 34 are arranged between the lower fork rollers 33 and are connected to the lower fork 31. The middle fork assembly 2 is arranged between the two lower forks 31, and the transmission gear 32 is meshed with the middle fork rack 23.

[0056] The driving assembly 5 includes a motor 51, a torque limiter 52, a gear shaft 53, a sprocket 54 and a universal shaft 55. The motor 51 is arranged between the lower fork assemblies 3 and is installed on the lower fork 31 on one side through a motor fixing seat. The universal shaft 55 is arranged on the lower fork 31 away from the side of the motor 51. The torque limiter 52 is arranged at the output end of the motor 51. The gear shaft 53 is arranged at one end of the universal shaft 50 close to the motor 51. The sprocket 54 is arranged on the outside of the gear shaft 53 and is connected to the active sprocket on the torque limiter 52 through a chain.

[0057] The upper fork assembly 1 further includes at least one upper fork rack 14, the upper fork rack 14 is disposed at the lower side of the upper fork 11 and connected to the upper fork 11, and the upper fork rack 14 is meshed with a roller chain 27;

[0058] The lower fork assembly 3 further includes a lower fork rack 35 , which is disposed on one side of the transmission gear 32 and connected to the lower fork 31 .

[0059] It should be noted that the upper fork rack 14 and the lower fork rack 35 described in this embodiment can be short racks such as Figure 8 shown.

[0060] The working principle of a fork used in a narrow space described in this embodiment is as follows:

[0061] The motor 51 is started in the forward direction, and the motor 51 drives the torque limiter 52 to rotate. The torque limiter 52 is connected to the sprocket 54 through a chain transmission, so when the torque limiter 52 rotates, the sprocket 54 is driven to rotate together, and when the sprocket 54 rotates, the gear shaft 53 is driven to rotate together. Since the lower fork assemblies 3 are connected through the universal shaft 4, the two forks can be operated synchronously;

[0062] Since the gear shaft 53 is meshed with the transmission gear 32, the rotation of the gear shaft 53 will drive the transmission gear 32 to rotate together, and the gear of the transmission gear 32 is meshed with the rack 23, so the middle fork assembly 2 extends;

[0063] Since the roller chain 27 is wrapped around the middle fork 21 and the roller sprocket assembly 26, there is no constraint in the circumferential direction, and it is meshed with the lower fork rack 35 (short rack) in the lower fork assembly 3, when the middle fork assembly 2 is extended, the roller chain 27 rolls relative to the middle fork 21 at the same linear speed as the middle fork 21. Since the upper fork rack 14 (short rack) in the upper fork assembly 2 is also meshed with the roller chain 27, the upper fork assembly 1 is also extended at the same linear speed as the roller chain 27 relative to the middle fork 21. Since the upper fork roller 12 and the upper fork guide block 13 are in the upper fork roller track 25, and the lower fork roller 33 and the lower fork guide block 34 are in the lower fork roller track 26, the degrees of freedom in the vertical direction and the left-right direction are constrained, so that the upper fork assembly 10 and the middle fork assembly 20 can smoothly extend to pick up or put down goods and return to the center.

[0064] Example 4

[0065] In this embodiment, Figures 1 to 6 A fork for use in a narrow space includes:

[0066] The fork comprises an upper fork assembly 1, a middle fork assembly 2 and a lower fork assembly 3. The upper fork assembly 1 is arranged above the middle fork assembly 2 and connected to the middle fork assembly 2. The middle fork assembly 2 is arranged above the lower fork assembly 3 and connected to the lower fork assembly 3. The lower fork assemblies 3 are connected via a universal shaft 4.

[0067] The driving assembly 5 is disposed between the lower fork assemblies 3 and connected to the lower fork assemblies 3 .

[0068] like Figure 2 The upper fork assembly 1 shown includes an upper fork 11, a group of upper fork rollers 12, and a group of upper fork guide blocks 13. The upper fork 11 is arranged in a T shape, the upper fork rollers 12 are arranged at intervals on both sides of the upper fork 11, and are connected to the upper fork 11, and the upper fork guide blocks 13 are arranged between the upper fork rollers 12 and are connected to the upper fork 11.

[0069] like Figure 3 The middle fork assembly 2 shown includes a middle fork 21, a gear set 22, and a middle fork rack 23. The gear set 22 is arranged at intervals on both sides of the middle fork 21 and is connected to the middle fork 21. The middle fork rack 23 is arranged on the lower side of the middle fork 21 and is connected to the middle fork 21. Upper fork roller tracks 24 are arranged on both sides of the middle fork 21, and lower fork roller tracks 25 are arranged on both sides.

[0070] like Figure 4The lower fork assembly 3 shown includes a group of lower forks 31, a transmission gear 32, a group of lower fork rollers 33, and a group of lower fork guide blocks 34. The lower forks 31 are relatively arranged, and the transmission gear 32 is arranged on the inner side of the lower fork 31 and is connected to the fixed plate below the lower fork 31. The lower fork rollers 33 are relatively spaced and arranged on the inner side of the lower fork 31 and are located above the transmission gear 32. The lower fork guide blocks 34 are arranged between the lower fork rollers 33 and are connected to the lower fork 31. The middle fork assembly 2 is arranged between the two lower forks 31, and the transmission gear 32 is meshed with the middle fork rack 23.

[0071] The upper fork assembly 1 further includes at least one upper fork rack 14, the upper fork rack 14 is disposed at the lower side of the upper fork 11 and connected to the upper fork 11, and the upper fork rack 14 is meshed with a roller chain 27;

[0072] The lower fork assembly 3 further includes a lower fork rack 35 , which is disposed on one side of the transmission gear 32 and connected to the lower fork 31 .

[0073] It should be noted that if Fig.12 In the embodiment shown, the upper fork rack 14 and the lower fork rack 35 are full racks.

[0074] like Figure 5 The drive assembly 5 shown includes a motor 51, a torque limiter 52, a gear shaft 53, a sprocket 54 and a universal shaft 55. The motor 51 is arranged between the lower fork assemblies 3 and is installed on the lower fork 31 on one side through a motor fixing seat. The universal shaft 55 is arranged on the lower fork 31 away from the motor 51. The torque limiter 52 is arranged at the output end of the motor 51. The gear shaft 53 is arranged at one end of the universal shaft 50 close to the motor 51. The sprocket 54 is arranged on the outside of the gear shaft 53 and is connected to the active sprocket on the torque limiter 52 through a chain.

[0075] The upper part of the middle fork 21 is concave, the lower part of the upper fork 11 is located in the middle fork 21, and is connected with the gear set 22 through the rack 14, and the upper fork roller 12 and the upper fork guide block 13 are located in the middle fork 21. The middle fork and the upper fork are stably matched, the structure is strong, the installation is convenient, and the fork is quick and labor-saving.

[0076] The lower portion of the middle fork 21 is located inside the lower fork 31 , and the upper portion of the lower fork 31 is concavely arranged and connected to the middle fork 21 via a lower fork roller 33 .

[0077] The gear set 22 cooperates with the lower fork rack 35, and the middle fork rack 23 cooperates with the transmission gear 32. The matching structure of the rack and gear ensures the stability of the fork movement and improves the efficiency of forking the goods.

[0078] The universal shaft 4 is disposed between the lower forks 31 and connected to the lower forks 31 via a fixing plate. The transmission gear 32 is connected in cooperation with the gear on the gear shaft 53 .

[0079] The working principle of a fork used in a narrow space described in this embodiment is as follows:

[0080] The motor 51 is started in the forward direction, and the motor 51 drives the torque limiter 52 to rotate. The torque limiter 52 is connected to the sprocket 54 through a chain transmission, so when the torque limiter 52 rotates, the sprocket 54 is driven to rotate together, and when the sprocket 54 rotates, the gear shaft 53 is driven to rotate together. Since the lower fork assemblies 3 are connected through the universal shaft 4, the two forks can be operated synchronously;

[0081] Since the gear shaft 53 is meshed with the transmission gear 32, the rotation of the gear shaft 53 will drive the transmission gear 32 to rotate together, and the gear of the transmission gear 32 is meshed with the rack 23, so the middle fork assembly 2 extends;

[0082] Since the gear set 22 in the middle fork assembly 2 is meshed with the rack 35 in the lower fork assembly 3, when the middle fork assembly 2 is extended, the gear set 22 rotates accordingly; the gear set 22 is meshed with the upper fork rack 14 in the upper fork assembly 1, so the upper fork assembly 1 is also extended accordingly.

[0083] Because the upper fork roller 12 and the upper fork guide block 13 are in the upper fork roller track 24, and the lower fork roller 33 and the lower fork guide block 34 are in the lower fork roller track 25, the degrees of freedom in the vertical direction and the left and right directions are constrained, thereby realizing the functions of the upper fork assembly 1 and the middle fork assembly 2 being able to smoothly extend to pick up or put down goods and return to the center.

[0084] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A fork used in a narrow space, characterized in that: include: A cargo fork comprises a set of upper fork assemblies (1), a set of middle fork assemblies (2), and a set of lower fork assemblies (3); the upper fork assemblies (1) are arranged above the middle fork assemblies (2) and connected to the middle fork assemblies (2); the middle fork assemblies (2) are arranged above the lower fork assemblies (3) and connected to the lower fork assemblies (3); the lower fork assemblies (3) are connected via a universal shaft (4); A driving assembly (5), wherein the driving assembly (5) is arranged between the lower fork assemblies (3) and connected to the lower fork assemblies (3).

2. The fork for use in a narrow space according to claim 1, characterized in that: The upper fork assembly (1) comprises an upper fork (11), a group of upper fork rollers (12), and a group of upper fork guide blocks (13). The upper fork (11) is arranged in a T-shape, the upper fork rollers (12) are arranged at intervals on both sides of the upper fork (11) and are connected to the upper fork (11), and the upper fork guide blocks (13) are arranged between the upper fork rollers (12) and are connected to the upper fork (11).

3. The fork for use in a narrow space according to claim 2, characterized in that: The middle fork assembly (2) comprises a middle fork (21), a group of gear sets (22), and a middle fork rack (23); the gear sets (22) are arranged at intervals on both sides of the middle fork (21) and are connected to the middle fork (21); the middle fork rack (23) is arranged on the lower side of the middle fork (21) and is connected to the middle fork (21); upper fork roller tracks (24) are arranged on both sides of the middle fork (21), and lower fork roller tracks (25) are arranged on both sides.

4. The fork for use in a narrow space according to claim 3, characterized in that: The lower fork assembly (3) comprises a group of lower forks (31), a transmission gear (32), a group of lower fork rollers (33), and a group of lower fork guide blocks (34). The lower forks (31) are arranged opposite to each other. The transmission gear (32) is arranged on the inner side of the lower fork (31) and is connected to a fixed plate below the lower fork (31). The lower fork rollers (33) are arranged on the inner side of the lower fork (31) at a relative interval and are located above the transmission gear (32). The lower fork guide blocks (34) are arranged between the lower fork rollers (33) and are connected to the lower fork (31). The middle fork assembly (2) is arranged between the two lower forks (31), and the transmission gear (32) is meshed with the middle fork rack (23).

5. The fork for use in a narrow space according to claim 4, characterized in that: The driving assembly (5) comprises a motor (51), a torque limiter (52), a gear shaft (53) and a sprocket (54); the motor (51) is arranged between the lower fork assemblies (3) and is mounted on the lower fork (31) on one side through a motor fixing seat; the universal shaft (4) is arranged on the lower fork (31) on a side away from the motor (51); the torque limiter (52) is arranged at the output end of the motor (51); the gear shaft (53) is arranged at one end of the universal shaft (4) close to the motor (51); the sprocket (54) is arranged on the outer side of the gear shaft (53) and is connected to the driving sprocket on the torque limiter (52) through a chain.

6. The fork for use in a narrow space according to claim 5, characterized in that: The invention also comprises a tensioner (6), wherein the tensioner (6) comprises a tensioning seat (61), a tensioning head (62), a screw (63), a sleeve (64), a compression spring (65) and a fixing block (66); the tensioning seat (61) is arranged on the lower fork assembly (3); the tensioning head (62) is arranged on the tensioning seat (61) and is connected to a fixing seat on the tensioning seat (61) through a screw (63); a sleeve (64) is arranged on the outer side of the fixing seat on the screw (63); a compression spring (65) is arranged in the sleeve (64); the fixing block (66) is installed on the upper fork assembly (1); and the fixing block (66) is connected to the tensioning head (62) and the plate chain (55).

7. The fork for use in a narrow space according to claim 4, characterized in that: The middle fork assembly (2) further comprises a roller sprocket assembly (26) and a roller chain (27), wherein the roller sprocket assembly (26) is arranged on the middle fork (21), and the roller chain (27) surrounds the middle fork (21) and the roller sprocket assembly (26) and meshes with the lower fork rack (35).

8. The fork for use in a narrow space according to claim 7, characterized in that: The upper fork assembly (1) further comprises at least one upper fork rack (14), wherein the upper fork rack (14) is arranged at the lower side of the upper fork (11) and connected to the upper fork (11), and the upper fork rack (14) is meshed with a roller chain (27); The lower fork assembly (3) further comprises a lower fork rack (35), wherein the lower fork rack (35) is arranged on one side of the transmission gear (32) and is connected to the lower fork (31).

9. The fork for use in a narrow space according to claim 8, characterized in that: The upper fork rack (14) and the lower fork rack (35) can be short racks or full racks.

10. The fork for use in a narrow space according to claim 7, characterized in that: The roller sprocket assembly (26) comprises a group of first screw rods (261), a pin shaft (262), a bearing (263), a roller sprocket (264) and a fixing plate (265); the first screw rods (261) are arranged opposite to each other, one end of which is connected via the pin shaft (262), and the other end of which is provided with a fixing plate (265); the roller sprocket (264) is connected to the pin shaft (262) via the bearing (263), and the fixing plate (265) is connected to the end of the middle fork (21).

Images