Chain telescopic fork

Abstract

The utility model discloses a chain telescopic fork which comprises an upper fork assembly, a middle fork assembly, a lower fork assembly, a driving assembly and a transmission shaft assembly, the upper fork assembly covers the middle fork assembly, the middle fork assembly is installed on the lower fork assembly, the driving assembly and the transmission shaft assembly are installed on the lower fork assembly, and the driving assembly drives the lower fork assembly to move through the transmission shaft assembly. The lower fork assembly and the middle fork assembly are in transmission through a chain, and the middle fork assembly and the upper fork assembly are in transmission through a chain. The utility model adopts pure chain transmission, and is low in processing and manufacturing cost; the limiting wheel assembly and the guide wheel assembly of the lower middle fork assembly are arranged on the single side and are in the two dimensions of the vertical plane and the horizontal plane respectively, and cost is saved. Limiting in the left-right direction of the fork body is increased through the limiting wheel. Flexible transmission is achieved, running is smooth, and operation and maintenance are convenient.

Description

Technical Field

[0001] The utility model relates to a telescopic fork, in particular to a chain telescopic fork. Background Art

[0002] Telescopic forks are widely used in warehousing, papermaking, packaging, printing, tobacco, home appliances, wine and beverages, wool and cotton textiles, ports and terminals, railways, automobile manufacturing, steel smelting, chemicals and construction industries.

[0003] The conventional telescopic fork is driven by a rack and pinion in combination with a chain. This structure has a large number of gears, requires high gear precision, has poor flexibility, and is prone to jamming.

[0004] The bottom guide wheels of a conventional telescopic fork are located on the lower fork, covering the entire fork body and evenly distributed on both sides of the fork body. This structure has a large number of guide wheels and is costly.

[0005] Therefore, it is necessary to provide a new chain telescopic fork to solve the above problems. Summary of the invention

[0006] In order to solve the problem of jamming caused by a large number of gears and guide wheels in the existing telescopic fork driving method, the utility model provides a chain telescopic fork with good flexibility and not easy to jam. The chain telescopic fork has flexible transmission and smooth operation.

[0007] The utility model provides the following technical solutions:

[0008] A chain telescopic fork comprises an upper fork assembly, a middle fork assembly, a lower fork assembly, a driving assembly and a transmission shaft assembly, wherein the upper fork assembly covers the middle fork assembly, the middle fork assembly is mounted on the lower fork assembly, the driving assembly and the transmission shaft assembly are mounted on the lower fork assembly, the driving assembly drives the lower fork assembly to move via the transmission shaft assembly, the lower fork assembly and the middle fork assembly are driven by a chain, the middle fork assembly and the upper fork assembly are driven by a chain, and the chain on the middle fork assembly respectively engages with a rack group on the lower fork assembly and a rack on the upper fork assembly.

[0009] Furthermore, the upper fork assembly includes an upper fork, a rack, a limiting wheel, a guide wheel and a guide block. The rack and multiple limiting wheels are fixed on the inner top surface of the upper fork, and guide wheels and guide blocks are installed on the two inner side surfaces of the upper fork. The guide wheels on the two inner side surfaces of the upper fork slide in the track on the outer side surface of the middle fork assembly.

[0010] Furthermore, the middle fork assembly includes a middle fork, a sprocket assembly and a rack assembly. The sprocket assembly and the rack assembly are installed in the middle of the middle fork. A chain is mounted on the sprocket assembly, and the chain cooperates with the rack of the upper fork assembly. The guide wheel assembly, the guide block assembly and the limiting wheel assembly are installed at the lower part of the middle fork.

[0011] Furthermore, the lower fork assembly includes a lower fork, a rack group, a sprocket group and a chain group. The sprocket groups are installed on the two inner sides of the lower fork, and the chain group is mounted on the sprocket group. The chain group cooperates with the rack assembly of the middle fork assembly. The rack groups are installed on the top of the two side surfaces of the lower fork, and the rack group cooperates with the chain on the middle fork assembly. Slide rails are opened on the two outer sides of the lower fork, and the guide wheel assembly of the middle fork assembly slides in the slide rails.

[0012] Furthermore, the drive assembly includes a motor, a drive shaft, a driving sprocket, a driven sprocket, a tensioning wheel and a drive chain. The driving sprocket is installed on the shaft of the motor, a drive chain is sleeved between the driving sprocket and the driven sprocket, two tensioning wheels are arranged between the driving sprocket and the driven sprocket, and the drive shaft is installed between the two tensioning wheels.

[0013] Furthermore, the transmission shaft assembly includes a fixed seat, a transmission shaft and a sprocket. The transmission shaft is installed in the fixed seat, and the sprocket is installed on the transmission shaft.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the utility model has an upper fork assembly, a middle fork assembly and a lower fork assembly, the lower fork assembly and the middle fork assembly are driven by a chain, and the middle fork assembly and the upper fork assembly are driven by a chain. The utility model is a pure chain drive, and the processing and manufacturing cost is low; the limiting wheel assembly and the guide wheel assembly of the lower middle fork assembly are single-sided, respectively in the vertical plane and the horizontal plane, saving costs; the limiting wheel increases the left and right directions of the fork body; flexible transmission, smooth operation, easy operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model.

[0016] Figure 2 It is a structural schematic diagram of the upper fork assembly of the utility model.

[0017] Figure 3 It is a structural schematic diagram of the middle fork assembly of the utility model.

[0018] Figure 4 It is an enlarged schematic diagram of the middle fork assembly of the utility model.

[0019] Figure 5 It is a structural schematic diagram of the lower fork assembly of the utility model.

[0020] Figure 6 It is a structural schematic diagram of the drive assembly of the utility model.

[0021] Figure 7 It is a structural schematic diagram of the transmission shaft assembly of the utility model.

[0022] In the figure: 10, upper fork assembly, 20, middle fork assembly, 30, lower fork assembly, 40, drive assembly, 50, transmission shaft assembly;

[0023] 11. upper fork, 12. rack, 13. limiting wheel, 14. guide wheel, 15. guide block;

[0024] 21. middle fork, 22. sprocket assembly, 23. guide wheel assembly, 24. guide block assembly, 25. limit wheel assembly, 26. rack assembly, 27. chain, 28. track;

[0025] 31. lower fork, 32. rack set, 33. sprocket set, 34. chain set, 35. slide rail;

[0026] 41. motor, 42. drive shaft, 43. driving sprocket, 44. driven sprocket, 45. tensioning wheel, 46. driving chain;

[0027] 51. Fixed seat, 52. Transmission shaft, 53. Sprocket. Implementation

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-5 A chain telescopic fork of the utility model comprises an upper fork assembly 10, a middle fork assembly 20, a lower fork assembly 30, a driving assembly 40 and a transmission shaft assembly 50. The upper fork assembly 10 covers the middle fork assembly 20, the middle fork assembly 20 is installed on the lower fork assembly 30, the driving assembly 40 and the transmission shaft assembly 50 are installed on the lower fork assembly 30, the driving assembly 40 drives the lower fork assembly 30 to move through the transmission shaft assembly 50, the lower fork assembly 30 and the middle fork assembly 20 are driven by a chain, and the middle fork assembly 20 and the upper fork assembly 10 are driven by a chain.

[0030] Figure 2 As shown, the upper fork assembly 10 includes an upper fork 11, a rack 12, a limiting wheel 13, a guide wheel 14, and a guide block 15. The rack 12 and a plurality of limiting wheels 13 are fixed on the inner top surface of the upper fork 11, and the guide wheels 14 and the guide blocks 15 are installed on the two inner side surfaces of the upper fork 11. The guide wheels 14 on the two inner side surfaces of the upper fork 11 slide in the track 28 on the outer side surface of the middle fork assembly 20.

[0031] Figure 3 and Figure 4As shown, the middle fork assembly 20 includes a middle fork 21, a sprocket assembly 22 and a rack assembly 26. The sprocket assembly 22 and the rack assembly 26 are installed in the middle of the middle fork 21. A chain 27 is mounted on the sprocket assembly 22. The chain 27 cooperates with the rack 12 of the upper fork assembly. The guide wheel assembly 23, the guide block assembly 24 and the limiting wheel assembly 25 are installed at the lower part of the middle fork 21.

[0032] Figure 5 As shown, the lower fork assembly 30 includes a lower fork 31, a rack group 32, a sprocket group 33 and a chain group 34. The sprocket groups 33 are installed on the two inner side surfaces of the lower fork 31, and the chain group 34 is mounted on the sprocket group 33. The chain group 34 cooperates with the rack assembly 26 of the middle fork assembly 20. The rack groups 32 are installed on the top of the two side surfaces of the lower fork 31, and the rack group 32 cooperates with the chain 27 on the middle fork assembly 20. Slide rails 35 are opened on the two outer side surfaces of the lower fork 31, and the guide wheel assembly 23 of the middle fork assembly 20 slides in the slide rails 35.

[0033] Figure 6 As shown, the driving assembly 40 includes a motor 41, a driving shaft 42, a driving sprocket 43, a driven sprocket 44, a tensioning wheel 45 and a driving chain 46. The driving sprocket 43 is installed on the shaft of the motor 41, and the driving chain 46 is sleeved between the driving sprocket 43 and the driven sprocket 44. Two tensioning wheels 45 are arranged between the driving sprocket 43 and the driven sprocket 44, and the driving shaft 42 is installed between the two tensioning wheels 45.

[0034] Figure 7 As shown, the transmission shaft assembly 50 includes a fixing seat 51 , a transmission shaft 52 and a sprocket 53 . The transmission shaft 52 is installed in the fixing seat 51 , and the sprocket 53 is installed on the transmission shaft 52 .

[0035] After the motor 41 is started forward, the driving sprocket 43 rotates forward, the driving shaft 42 rotates, and meshes with the bevel gear in the fixed seat 51, converting the circular motion of the horizontal plane into the linear motion of the vertical plane, driving the sprocket 53 to rotate forward, the sprocket 53 meshes with the chain group 34 on the lower fork assembly 30, driving the chain group 34 to move forward, the chain group 34 meshes with the rack assembly 26 on the middle fork assembly 20, driving the middle fork assembly 20 to move forward, because the chain 27 on the middle fork assembly 20 respectively meshes with the rack group 32 on the lower fork assembly 30 and the rack 12 on the upper fork assembly 10, the chain 27 moves forward, and the rack group 32 on the lower fork assembly 30 is fixed, so the chain 27 drives the rack 12 on the upper fork assembly 10 to move forward, so the upper fork assembly 10 moves forward;

[0036] After the motor 41 is started in reverse, the active sprocket 43 rotates in the reverse direction, the drive shaft 42 rotates, and meshes with the bevel gear in the fixed seat 51, converting the circular motion in the horizontal plane into linear motion in the vertical plane, driving the sprocket 53 to rotate in the reverse direction, the sprocket 53 meshes with the chain group 34 on the lower fork assembly 30, driving the chain group 34 to move in the reverse direction, the chain group 34 meshes with the rack assembly 26 on the middle fork assembly 20, driving the middle fork assembly 20 to move in the reverse direction, because the chain 27 on the middle fork assembly 20 meshes with the rack group 32 on the lower fork assembly 30 and the rack 12 on the upper fork assembly 10 respectively, the chain 27 moves in the reverse direction, the rack group 32 on the lower fork assembly 30 is fixed, so the chain 27 drives the rack 12 on the upper fork assembly 10 to move in the reverse direction, and therefore the upper fork assembly 10 moves in the reverse direction.

[0037] The utility model converts circular motion of a horizontal plane into linear motion of a vertical plane; it has flexible transmission, smooth operation, and convenient operation and maintenance; the limiting wheel assembly 25 and the guide wheel assembly 23 of the lower middle fork assembly 20 are single-sided, in two dimensions of the vertical plane and the horizontal plane, respectively, to save costs; the structure increases the limitation of the fork body in the left and right directions through the limiting wheel; it has pure chain transmission, and the processing and manufacturing cost is low.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chain telescopic fork, characterized in that: The invention comprises an upper fork assembly (10), a middle fork assembly (20), a lower fork assembly (30), a driving assembly (40) and a transmission shaft assembly (50), wherein the upper fork assembly (10) covers the middle fork assembly (20), the middle fork assembly (20) is mounted on the lower fork assembly (30), the driving assembly (40) and the transmission shaft assembly (50) are mounted on the lower fork assembly (30), the driving assembly (40) drives the lower fork assembly (30) to move via the transmission shaft assembly (50), the lower fork assembly (30) and the middle fork assembly (20) are driven by a chain, the middle fork assembly (20) and the upper fork assembly (10) are driven by a chain, and the chain (27) on the middle fork assembly (20) is respectively engaged with a rack assembly (32) on the lower fork assembly (30) and a rack (12) on the upper fork assembly (10).

2. A chain telescopic fork according to claim 1, characterized in that: The upper fork assembly (10) comprises an upper fork (11), a rack (12), a limiting wheel (13), a guide wheel (14) and a guide block (15); the rack (12) and a plurality of limiting wheels (13) are fixed on the inner top surface of the upper fork (11); the guide wheels (14) and the guide block (15) are installed on the inner two side surfaces of the upper fork (11); the guide wheels (14) on the inner two side surfaces of the upper fork (11) slide in the track (28) on the outer side surface of the middle fork assembly (20).

3. A chain telescopic fork according to claim 1, characterized in that: The middle fork assembly (20) comprises a middle fork (21), a sprocket assembly (22) and a rack assembly (26); the sprocket assembly (22) and the rack assembly (26) are installed in the middle of the middle fork (21); a chain (27) is sleeved on the sprocket assembly (22); the chain (27) cooperates with the rack (12) of the upper fork assembly; and a guide wheel assembly (23), a guide block assembly (24) and a limit wheel assembly (25) are installed at the lower part of the middle fork (21).

4. A chain telescopic fork according to claim 1, characterized in that: The lower fork assembly (30) comprises a lower fork (31), a rack assembly (32), a sprocket assembly (33) and a chain assembly (34); the sprocket assembly (33) is installed on the two inner side surfaces of the lower fork (31); the chain assembly (34) is sleeved on the sprocket assembly (33); the chain assembly (34) cooperates with the rack assembly (26) of the middle fork assembly (20); the rack assembly (32) is installed on the top of the two side surfaces of the lower fork (31); the rack assembly (32) cooperates with the chain (27) on the middle fork assembly (20); the two outer side surfaces of the lower fork (31) are provided with slide rails (35); the guide wheel assembly (23) of the middle fork assembly (20) slides in the slide rails (35).

5. The telescopic chain fork according to claim 1, characterized in that: The driving assembly (40) comprises a motor (41), a driving shaft (42), a driving sprocket (43), a driven sprocket (44), a tensioning wheel (45) and a driving chain (46); the driving sprocket (43) is mounted on the shaft of the motor (41); a driving chain (46) is sleeved between the driving sprocket (43) and the driven sprocket (44); two tensioning wheels (45) are arranged between the driving sprocket (43) and the driven sprocket (44); and the driving shaft (42) is mounted between the two tensioning wheels (45).

6. A telescopic chain fork according to claim 1, characterized in that: The transmission shaft assembly (50) comprises a fixing seat (51), a transmission shaft (52) and a sprocket (53); the transmission shaft (52) is installed in the fixing seat (51), and the sprocket (53) is installed on the transmission shaft (52).

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