Forklift portal oil way system

Abstract

The utility model provides a forklift portal oil way system, and relates to the technical field of oil way systems. The forklift portal oil way system comprises a frame body, a pallet fork structure, a first lifting oil cylinder assembly, a second lifting oil cylinder assembly and a first oil way. The frame body comprises an outer door frame, a middle door frame and an inner door frame, the pallet fork structure is connected with the inner door frame in a sliding mode, the inner door frame is arranged in the middle door frame in a sliding mode, and the middle door frame is arranged in the outer door frame in a sliding mode; the first lifting oil cylinder assembly is used for enabling the pallet fork structure to slide along the inner portal frame, and the second lifting oil cylinder assembly is used for enabling the inner portal frame to slide along the middle portal frame and enabling the middle portal frame to slide along the outer portal frame; the multiple second lifting oil cylinder assemblies are sequentially connected in series through the first oil way and then connected with the first lifting oil cylinder assembly in series, and the first oil way is used for providing hydraulic oil for the first lifting oil cylinder assembly and the second lifting oil cylinder assemblies. The situation that sight is blocked by an oil way can be improved.

Description

Technical Field

[0001] This application relates to the technical field of oil circuit systems, and in particular to a forklift mast oil circuit system. Background Art

[0002] The forklift mast is an important component for the forklift to achieve the lifting function. There is one oil cylinder on each side of the standard mast. On the basis of the standard mast, an additional lifting oil cylinder is added in the middle of the forklift secondary mast, enabling the forklift to reach a higher free lifting height, which is suitable for working in some low spaces.

[0003] In order to enable the middle lifting oil cylinder to work properly, corresponding pipelines need to be added to supply hydraulic oil. The existing oil circuit design usually adopts the method of dispersing the oil supply from the middle oil cylinder to the oil cylinders on both sides. This situation will cause the oil circuit layout to block the line of sight and affect the driver's vision. Utility Model Content

[0004] In order to improve the situation of the oil circuit blocking the line of sight, this application provides a forklift mast oil circuit system.

[0005] This application provides a forklift mast oil circuit system, adopting the following technical solution:

[0006] A forklift mast oil circuit system includes a frame body, a fork structure, a first lifting oil cylinder assembly, a second lifting oil cylinder assembly, and a first oil circuit; the frame body includes an outer mast, a middle mast, and an inner mast. The fork structure is slidably connected to the inner mast. The inner mast is slidably arranged within the middle mast, and the middle mast is slidably arranged within the outer mast;

[0007] The first lifting oil cylinder assembly is used to make the fork structure slide along the inner mast, and the second lifting oil cylinder assembly is used to make the inner mast slide along the middle mast and make the middle mast slide along the outer mast;

[0008] There are multiple second lifting oil cylinder assemblies. The first oil circuit sequentially connects multiple second lifting oil cylinder assemblies in series and then connects with the first lifting oil cylinder assembly in series. The first oil circuit is used to supply hydraulic oil to the first lifting oil cylinder assembly and the second lifting oil cylinder assemblies.

[0009] By adopting the above technical solution, when the hydraulic oil enters the second lifting oil cylinder assembly and the first lifting oil cylinder assembly from the first oil circuit, the first lifting oil cylinder assembly makes the fork structure slide along the inner mast, and the second lifting oil cylinder assembly makes the inner mast slide along the middle mast and makes the middle mast slide along the outer mast, thereby further lifting the fork structure. The first oil circuit of this application sequentially connects multiple second lifting oil cylinder assemblies in series and then connects with the first lifting oil cylinder assembly in series, which can reduce the oil circuit layout of the first oil circuit at the first lifting oil cylinder assembly, thereby reducing the blockage of the line of sight.

[0010] Optionally, the first lifting oil cylinder assembly includes:

[0011] An intermediate oil cylinder, the cylinder body of which is arranged on the inner gantry;

[0012] A first sprocket, which is rotatably connected to the piston rod of the intermediate oil cylinder;

[0013] A first chain, which bypasses the first sprocket, one end of the first chain is connected to the cylinder body of the intermediate oil cylinder, and the other end of the first chain is connected to the fork structure.

[0014] By adopting the above technical solution, the piston rod of the intermediate oil cylinder can drive the first sprocket to move, and the first sprocket makes the first chain pull the fork structure to move, so as to lift the goods.

[0015] Optionally, the second lifting oil cylinder assembly includes:

[0016] A side oil cylinder, the cylinder body of which is connected to the outer gantry, and the piston rod of which is connected to the middle gantry;

[0017] A second sprocket, which is rotatably connected to the middle gantry;

[0018] A second chain, which bypasses the second sprocket, one end of the second chain is connected to the outer gantry, and the other end of the second chain is connected to the inner gantry.

[0019] By adopting the above technical solution, the piston rod of the side oil cylinder can drive the middle gantry to move, the middle gantry drives the second sprocket to move, and the second sprocket makes the second chain pull the inner gantry to move, so as to further lift the fork structure.

[0020] Optionally, the first oil circuit includes an inlet oil pipe, a connecting oil pipe and a delivery oil pipe; there are two side oil cylinders, and the two side oil cylinders are respectively a left side oil cylinder and a right side oil cylinder;

[0021] The inlet oil pipe is communicated with the bottom end of the left side oil cylinder, the connecting oil pipe is respectively communicated with the top of the left side oil cylinder and the top of the right side oil cylinder, one end of the delivery oil pipe is communicated with the bottom of the right side oil cylinder, and the other end of the delivery oil pipe is communicated with the bottom end of the intermediate oil cylinder.

[0022] By adopting the above technical solution, the hydraulic oil enters the inlet oil pipe, then sequentially enters the left side oil cylinder, the connecting oil pipe, the right side oil cylinder and the delivery oil pipe, and finally enters the intermediate oil cylinder, so as to realize the sequential connection of the left side oil cylinder, the right side oil cylinder and the intermediate oil cylinder.

[0023] Optionally, the inner diameter and thickness of the left road cylinder are greater than the inner diameter and thickness of the right road cylinder, and the inner diameter and thickness of the right road cylinder are greater than the inner diameter and thickness of the middle cylinder.

[0024] By adopting the above technical solution, the left road cylinder, the right road cylinder and the middle cylinder are connected in series in sequence, and the inner diameters and thicknesses of the left road cylinder, the right road cylinder and the middle cylinder are reduced in sequence, which can ensure durability.

[0025] Optionally, the fork structure includes a supporting frame body, a connecting frame and a fork; the supporting frame body is slidably connected to the inner door frame, and the connecting frame is connected to the supporting frame body; the fork is slidably connected to the connecting frame, and a plurality of forks are provided; a fork adjustment assembly is provided on the connecting frame, and the fork adjustment assembly is used to make the fork slide along the connecting frame.

[0026] By adopting the above technical solution, the fork adjustment assembly can make the fork slide along the connecting frame, so that the distance between the forks can be adjusted to adapt to the size of the goods, so as to facilitate forking the goods.

[0027] Optionally, the fork adjustment assembly includes a driving source, an annular transmission member, a toggle block and a driving wheel; the driving wheel is rotatably connected to the connecting frame, two driving wheels are provided, and the annular transmission member is sleeved on the two driving wheels; the driving source is connected to the connecting frame, and the driving source is used to drive the driving wheel to rotate; the toggle block is connected to the annular transmission member, and the toggle block is used to abut against the fork and drive the fork to slide.

[0028] By adopting the above technical solution, the driving source can drive the driving wheel to rotate, the driving wheel causes the annular transmission member to move, and the annular transmission member drives the shifting block to abut against the fork, so that the shifting block drives the fork to slide.

[0029] Optionally, a second oil circuit is also included, and the second oil circuit is used to provide hydraulic oil to the fork adjustment assembly.

[0030] By adopting the above technical solution, the second oil circuit provides hydraulic oil to the fork adjusting assembly, so that the fork adjusting assembly can adjust the position of the fork.

[0031] Optionally, the middle mast is provided with a roller group, the output end of the first lifting cylinder assembly is rotatably connected to a pulley, and the second oil circuit is wound around the roller group and the pulley; a limiting pipe clamp is provided on the fork structure, the second oil circuit passes through the limiting pipe clamp, and the limiting pipe clamp is used to limit the second oil circuit.

[0032] By adopting the above technical solution, the output end of the first lifting oil cylinder assembly is the piston rod of the intermediate oil cylinder. The second oil circuit bypasses the roller group and the pulley and then passes through the limit pipe clamp, and finally communicates with the drive source, so that the second oil circuit is reasonably arranged.

[0033] Optionally, the limit pipe clamp includes:

[0034] A support plate, which is connected to the support frame body;

[0035] A limit rod, both ends of which are connected to the support plate, and a limit channel is formed between the limit rod and the support plate;

[0036] An abutting plate, which is located in the limit channel, is slidably connected to the limit rod, and the second oil circuit passes through between the abutting plate and the limit rod;

[0037] An abutting bolt, which passes through the support plate and abuts against the abutting plate, and is threadedly connected to the support plate.

[0038] By adopting the above technical solution, when the abutting bolt is screwed, the abutting bolt makes the abutting plate abut against the second oil circuit, so that the abutting plate and the limit rod clamp the second oil circuit to fix the position of the second oil circuit.

[0039] In summary, the present application includes at least one of the following beneficial effects:

[0040] 1. The first lifting oil cylinder assembly enables the fork structure to slide along the inner gantry, and the second lifting oil cylinder assembly enables the inner gantry to slide along the middle gantry and the middle gantry to slide along the outer gantry, thereby further lifting the fork structure;

[0041] 2. The hydraulic oil enters the inlet pipe, then sequentially enters the left-side oil cylinder, the connecting oil pipe, the right-side oil cylinder and the conveying oil pipe, and finally enters the intermediate oil cylinder, thereby realizing the sequential connection of the left-side oil cylinder, the right-side oil cylinder and the intermediate oil cylinder, so that the layout of the oil circuit at the intermediate oil cylinder can reduce the obstruction of the line of sight;

[0042] 3. The second oil circuit supplies hydraulic oil to the fork adjustment assembly, which can enable the fork adjustment assembly to adjust the distance between adjacent forks, so as to adapt to the size of the goods and facilitate lifting the goods. Brief Description of the Drawings

[0043] Figure 1 is the overall structural schematic diagram of the forklift gantry oil circuit system according to the embodiment of the present application;

[0044] Figure 2 is the partial structural schematic diagram of the outer gantry, middle gantry and inner gantry according to the embodiment of the present application;

[0045] Figure 3 It is a schematic diagram of the overall structure of the forklift mast oil circuit system without the second oil circuit in the embodiment of the present application;

[0046] Figure 4 It is a partial structural schematic diagram of the first lifting cylinder assembly of the embodiment of the present application;

[0047] Figure 5 It is a schematic diagram of the exploded structure of the fork adjustment assembly of the embodiment of the present application;

[0048] Figure 6 It is a structural schematic diagram of the roller assembly of an embodiment of the present application;

[0049] Figure 7 It is a schematic diagram of the structure of the limiting pipe clamp according to an embodiment of the present application.

[0050] Explanation of reference numerals: 1, frame; 11, outer door frame; 111, outer door channel steel; 112, outer door frame crossbeam; 12, middle door frame; 121, middle door channel steel; 122, middle door frame crossbeam; 13, inner door frame; 131, observation area; 14, first roller; 15, roller assembly; 151, second roller; 152, third roller; 16, pulley; 2, fork structure; 21, support frame; 22, connecting frame; 23, fork; 3, first lifting cylinder assembly; 31, intermediate cylinder; 32, first chain; 3 3. First sprocket; 4. Second lifting cylinder assembly; 41. Side cylinder; 411. Left cylinder; 412. Right cylinder; 42. Second chain; 43. Second sprocket; 5. Fork adjustment assembly; 51. Driving source; 52. Annular transmission member; 53. Toggle block; 54. Driving wheel; 6. First oil circuit; 61. Oil inlet pipe; 62. Connecting oil pipe; 63. Oil delivery pipe; 7. Second oil circuit; 8. Limiting pipe clamp; 81. Support plate; 82. Limiting rod; 83. Abutment plate; 84. Abutment bolt. DETAILED DESCRIPTION

[0051] The following is combined with Figure 1-7 This application is described in further detail.

[0052] An embodiment of the present application provides a forklift mast oil circuit system.

[0053] refer to Figure 1 and Figure 2, the forklift mast oil circuit system includes a mast 1, which consists of an outer mast 11, a middle mast 12, and an inner mast 13. The outer mast 11 includes an outer mast channel steel 111 and an outer mast cross beam 112. The middle mast 12 includes a middle mast channel steel 121 and a middle mast cross beam 122. The outer mast channel steel 111 is fixedly connected to the forklift body, and the outer mast cross beam 112 is fixedly connected to the outer mast channel steel 111. The middle mast channel steel 121 is located inside the outer mast channel steel 111 and is slidably connected to the outer mast channel steel 111. The middle mast cross beam 122 is fixedly connected to the middle mast 12. The inner mast 13 is located inside the middle mast channel steel 121 and is slidably connected to the middle mast channel steel 121. An observation area 131 is formed in the middle of the inner mast 13 to facilitate the driver to observe the operation situation.

[0054] Reference Figure 3 , a fork structure 2 is provided on the inner mast 13. The fork structure 2 includes a support frame body 21, a connecting frame 22, and forks 23. The support frame body 21 is slidably connected to the inner mast 13, and the connecting frame 22 is fixedly connected to the support frame body 21. The connecting frame 22 is horizontally arranged. There are two forks 23, and both forks 23 are slidably connected to the connecting frame 22, and the forks 23 can slide along the length direction of the connecting frame 22.

[0055] Reference Figure 3 and Figure 4 , a first lifting oil cylinder assembly 3 is provided on the inner mast 13. The first lifting oil cylinder assembly 3 includes an intermediate oil cylinder 31, a first chain 32, and a first sprocket 33. The intermediate oil cylinder 31 is specifically a plunger cylinder. The cylinder body of the intermediate oil cylinder 31 is fixedly connected to the bottom end of the inner mast 13, and the first sprocket 33 is rotatably connected to the piston rod of the intermediate oil cylinder 31. One end of the first chain 32 is fixedly connected to the cylinder body of the intermediate oil cylinder 31, and the other end of the first chain 32 is fixedly connected to the support frame body 21. The middle part of the first chain 32 is wound around the first sprocket 33. When the intermediate oil cylinder 31 is started, the piston rod of the intermediate oil cylinder 31 can lift the first sprocket 33, and the first sprocket 33 pulls up the support frame body 21 through the first chain 32, thereby lifting the fork structure 2.

[0056] Reference Figure 1 and Figure 2 , a second lifting oil cylinder assembly 4 is provided on the outer mast 11. The second lifting oil cylinder assembly 4 includes a side oil cylinder 41, a second chain 42, and a second sprocket 43. There are two sets of the second lifting oil cylinder assembly 4, so there are two side oil cylinders 41. The two side oil cylinders 41 are respectively located on both sides of the outer mast channel steel 111, and the two side oil cylinders 41 are respectively a left side oil cylinder 411 and a right side oil cylinder 412. The cylinder bodies of the left side oil cylinder 411 and the right side oil cylinder 412 are both fixedly connected to the outer mast channel steel 111, and the piston rods of the left side oil cylinder 411 and the right side oil cylinder 412 are both fixedly connected to the middle mast cross beam 122, so that the side oil cylinder 41 can lift the middle mast 12.

[0057] Reference Figure 1 and Figure 2 As shown in Figure 1 and Figure 2 , the second sprocket 43 is rotatably connected to the middle gantry crossbeam 122. One end of the second chain 42 is fixedly connected to the outer gantry crossbeam 112, and the other end of the second chain 42 is fixedly connected to the inner gantry 13. The middle part of the second chain 42 is wound around the second sprocket 43. When the side hydraulic cylinder 41 lifts the middle gantry 12, the middle gantry 12 drives the second sprocket 43 to move upward. The second sprocket 43 pulls the second chain 42 upward to drive the inner gantry 13, so as to lift the inner gantry 13. The inner gantry 13 drives the fork structure 2 to move upward, further lifting the fork structure 2.

[0058] Reference Figure 2 and Figure 3 As shown in Figure 2 and Figure 3 , the forklift gantry oil circuit system further includes a first oil circuit 6. The first oil circuit 6 includes an oil inlet pipe 61, a connecting oil pipe 62, and a delivery oil pipe 63. The oil inlet pipe 61 is communicated with the bottom end of the cylinder body of the left side hydraulic cylinder 411. The connecting oil pipe 62 is respectively communicated with the top end of the piston rod of the left side hydraulic cylinder 411 and the top end of the piston rod of the right side hydraulic cylinder 412. One end of the delivery oil pipe 63 is communicated with the bottom end of the cylinder body of the right side hydraulic cylinder 412. A first roller 14 is rotatably connected to the middle gantry crossbeam 122. The middle part of the delivery oil pipe 63 is wound around the first roller 14. The other end of the delivery oil pipe 63 is communicated with the bottom end of the cylinder body of the intermediate hydraulic cylinder 31. Thus, the left side hydraulic cylinder 411, the right side hydraulic cylinder 412, and the intermediate hydraulic cylinder 31 are connected in series in sequence, which can reduce the visual field occlusion of the observation area 131 by the oil circuit layout. The inner diameter and thickness of the left side hydraulic cylinder 411 are greater than those of the right side hydraulic cylinder 412, and the inner diameter and thickness of the right side hydraulic cylinder 412 are greater than those of the intermediate hydraulic cylinder 31, which can ensure durability.

[0059] Reference Figure 1 and Figure 5 As shown in Figure 1 and Figure 5 , a fork adjusting assembly 5 is provided on the connecting frame 22. The fork adjusting assembly 5 includes a driving source 51, an annular transmission member 52, and a driving wheel 54. In this embodiment, the driving wheel 54 is specifically a sprocket, the annular transmission member 52 is specifically a transmission chain, and the driving source 51 is specifically a hydraulic motor. The driving wheel 54 is rotatably connected to the connecting frame 22. There are two driving wheels 54. The annular transmission member 52 is sleeved on the two driving wheels 54. The body of the driving source 51 is fixedly connected to the connecting frame 22, and the output end of the driving source 51 is fixedly connected to the driving wheel 54.

[0060] Reference Figure 1 and Figure 5, two toggle blocks 53 are fixedly connected to the annular transmission member 52, the two toggle blocks 53 correspond to the two forks 23, and the two toggle blocks 53 are located between the two forks 23. When the driving source 51 is started, the driving source 51 drives the driving wheel 54 to rotate, the driving wheel 54 moves the annular transmission member 52, the annular transmission member 52 drives the toggle blocks 53 to move, the toggle blocks 53 can abut against the forks 23, the toggle blocks 53 push the forks 23 to slide along the connecting frame 22, and the spacing between the two forks 23 can be adjusted to adapt to the size of the goods. In other implementations of this embodiment, the driving wheel 54 can also be a pulley, the annular transmission member 52 can also be a transmission belt, the transmission belt is sleeved on the pulley, the toggle blocks 53 are connected to the transmission belt, and when the pulley rotates, the transmission belt can also move, thereby driving the toggle blocks 53 to move.

[0061] refer to Figure 2 and Figure 6 The middle mast cross beam 122 is provided with a roller group 15, the roller group 15 includes a second roller 151 and a third roller 152, and the second roller 151 and the third roller 152 are both rotatably connected to the middle mast cross beam 122. The forklift mast oil circuit system also includes a second oil circuit 7, and the second oil circuit 7 is provided with a plurality of parts, a part of the second oil circuit 7 is wound around the second roller 151, and another part is wound around the third roller 152.

[0062] refer to Figure 2 and Figure 4 The support frame 21 is provided with a limit pipe clamp 8, the piston rod of the intermediate oil cylinder 31 is rotatably connected to the pulley 16, the second oil circuit 7 bypasses the pulley 16 after bypassing the roller group 15, and then the second oil circuit 7 passes through the limit pipe clamp 8, and finally the second oil circuit 7 is connected with the driving source 51, thereby providing hydraulic oil to the driving source 51.

[0063] refer to Figure 4 and Figure 7 The limiting pipe clamp 8 includes a support plate 81, a limiting rod 82, an abutment plate 83 and an abutment bolt 84. The support plate 81 is fixedly connected to the support frame 21, the limiting rod 82 is bent, both ends of the limiting rod 82 are fixedly connected to the support plate 81, and a limiting channel is formed between the limiting rod 82 and the support plate 81. The abutment plate 83 is located in the limiting channel, the abutment plate 83 is slidably connected to the limiting rod 82, and the second oil circuit 7 passes between the abutment plate 83 and the limiting rod 82. The abutment bolt 84 passes through the support plate 81 and abuts against the abutment plate 83, and the abutment bolt 84 is threadedly connected to the support plate 81. When the abutment bolt 84 is screwed, the abutment bolt 84 can push the abutment plate 83 to move, so that the abutment plate 83 and the limiting rod 82 clamp the second oil circuit 7.

[0064] The implementation principle of a forklift mast oil circuit system in the embodiment of the present application is as follows: the first oil circuit 6 provides hydraulic oil to the middle oil cylinder 31 and the side oil cylinder 41 respectively, the middle oil cylinder 31 lifts the fork structure 2 through the first chain 32 and the first sprocket 33, and the side oil cylinder 41 lifts the middle mast 12 and the inner mast 13 through the second chain 42 and the second sprocket 43, thereby further lifting the fork structure 2. The first oil circuit 6 connects the left side oil cylinder 411, the right side oil cylinder 412 and the middle oil cylinder 31 in series in sequence, which can reduce the layout of the oil circuit in the observation area 131, thereby reducing the obstruction of the line of sight of the observation area 131. The second oil circuit 7 provides hydraulic oil to the driving source 51, the driving source 51 drives the annular transmission member 52 to move, the annular transmission member 52 drives the toggle block 53 to move, and the toggle block 53 drives the fork 23 to slide on the connecting frame 22, thereby adjusting the distance between the two forks 23 to adapt to goods of different sizes.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A forklift mast oil system, characterized in that: The invention comprises a frame (1), a fork structure (2), a first lifting cylinder assembly (3), a second lifting cylinder assembly (4) and a first oil circuit (6); the frame (1) comprises an outer mast (11), a middle mast (12) and an inner mast (13); the fork structure (2) is slidably connected to the inner mast (13); the inner mast (13) is slidably arranged in the middle mast (12); and the middle mast (12) is slidably arranged in the outer mast (11); The first lifting cylinder assembly (3) is used to make the fork structure (2) slide along the inner mast (13), and the second lifting cylinder assembly (4) is used to make the inner mast (13) slide along the middle mast (12) and to make the middle mast (12) slide along the outer mast (11); The second lifting cylinder assembly (4) is provided in plurality, and the first oil circuit (6) sequentially connects the plurality of the second lifting cylinder assemblies (4) in series and then connects them in series with the first lifting cylinder assembly (3). The first oil circuit (6) is used to supply hydraulic oil to the first lifting cylinder assembly (3) and the second lifting cylinder assembly (4).

2. A forklift mast oil system according to claim 1, characterized in that: The first lifting cylinder assembly (3) comprises: An intermediate oil cylinder (31), the cylinder body of the intermediate oil cylinder (31) being arranged on the inner mast (13); a first sprocket (33), the first sprocket (33) being rotatably connected to the piston rod of the intermediate oil cylinder (31); A first chain (32), the first chain (32) passing around the first sprocket (33), one end of the first chain (32) being connected to the cylinder body of the intermediate oil cylinder (31), and the other end of the first chain (32) being connected to the fork structure (2).

3. A forklift mast oil system according to claim 2, characterized in that: The second lifting cylinder assembly (4) comprises: A side oil cylinder (41), wherein the cylinder body of the side oil cylinder (41) is connected to the outer mast (11), and the piston rod of the side oil cylinder (41) is connected to the middle mast (12); A second sprocket (43), the second sprocket (43) being rotatably connected to the middle door frame (12); A second chain (42), the second chain (42) passing around the second sprocket (43), one end of the second chain (42) being connected to the outer door frame (11), and the other end of the second chain (42) being connected to the inner door frame (13).

4. A forklift mast oil system according to claim 3, characterized in that: The first oil circuit (6) comprises an oil inlet pipe (61), a connecting oil pipe (62) and an oil delivery pipe (63); two side oil cylinders (41) are provided, and the two side oil cylinders (41) are respectively a left side oil cylinder (411) and a right side oil cylinder (412); The oil inlet pipe (61) is connected to the bottom end of the left road oil cylinder (411), the connecting oil pipe (62) is connected to the top of the left road oil cylinder (411) and the top of the right road oil cylinder (412) respectively, one end of the oil delivery pipe (63) is connected to the bottom of the right road oil cylinder (412), and the other end of the oil delivery pipe (63) is connected to the bottom end of the middle oil cylinder (31); a first roller (14) is rotatably connected to the middle door frame (12), and the middle part of the oil delivery pipe (63) is wound around the first roller (14).

5. A forklift mast oil system according to claim 4, characterized in that: The inner diameter and thickness of the left-side oil cylinder (411) are greater than the inner diameter and thickness of the right-side oil cylinder (412), and the inner diameter and thickness of the right-side oil cylinder (412) are greater than the inner diameter and thickness of the middle oil cylinder (31).

6. The forklift mast oil system according to claim 1, characterized in that: The fork structure (2) comprises a support frame body (21), a connecting frame (22) and a fork (23); the support frame body (21) is slidably connected to the inner door frame (13), and the connecting frame (22) is connected to the support frame body (21); the fork (23) is slidably connected to the connecting frame (22), and a plurality of forks (23) are provided; a fork adjustment assembly (5) is provided on the connecting frame (22), and the fork adjustment assembly (5) is used to make the fork (23) slide along the connecting frame (22).

7. The forklift mast oil system according to claim 6, characterized in that: The fork adjustment assembly (5) comprises a driving source (51), an annular transmission member (52), a toggle block (53) and a driving wheel (54); the driving wheel (54) is rotatably connected to the connecting frame (22); two driving wheels (54) are provided, and the annular transmission member (52) is sleeved on the two driving wheels (54); the driving source (51) is connected to the connecting frame (22); the driving source (51) is used to drive the driving wheel (54) to rotate; the toggle block (53) is connected to the annular transmission member (52); the toggle block (53) is used to abut against the fork (23) and drive the fork (23) to slide.

8. The forklift mast oil system according to claim 6, characterized in that: It also includes a second oil circuit (7), wherein the second oil circuit (7) is used to supply hydraulic oil to the fork adjustment assembly (5).

9. The forklift mast oil system according to claim 8, characterized in that: The middle mast (12) is provided with a roller group (15); the output end of the first lifting cylinder assembly (3) is rotatably connected to a pulley (16); the second oil circuit (7) is arranged around the roller group (15) and the pulley (16); a limit pipe clamp (8) is provided on the fork structure (2); the second oil circuit (7) passes through the limit pipe clamp (8); and the limit pipe clamp (8) is used to limit the position of the second oil circuit (7).

10. The forklift mast oil system according to claim 9, characterized in that: The position limiting pipe clamp (8) comprises: A support plate (81), the support plate (81) being connected to the support frame (21); a limiting rod (82), wherein both ends of the limiting rod (82) are connected to the support plate (81), and a limiting channel is formed between the limiting rod (82) and the support plate (81); an abutment plate (83), the abutment plate (83) being located in the limiting passage, the abutment plate (83) being slidably connected to the limiting rod (82), and the second oil passage (7) passing between the abutment plate (83) and the limiting rod (82); An abutment bolt (84), wherein the abutment bolt (84) passes through the support plate (81) and abuts against the abutment plate (83), and the abutment bolt (84) is threadedly connected to the support plate (81).

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