Pallet fork hydraulic distance adjusting system for forklift

Abstract

The invention relates to the technical field of forklifts, in particular to a fork hydraulic distance adjusting system for a forklift, which comprises an oil cylinder group, an inner fork and an outer fork are arranged at two ends of the oil cylinder group, and the inner fork and the outer fork are L-shaped; the oil cylinder set comprises two symmetrically-distributed outer cylinders, inner cylinders are movably inserted into inner cavities of one ends of the outer cylinders, movable columns are movably inserted into inner cavities of one ends of the inner cylinders, one ends of the inner cylinders are fixed to the first sleeve plate, and one ends of the movable columns movably penetrate through the first sleeve plate and are fixed to the first protruding blocks. The forklift has the beneficial effects that the oil cylinder set is arranged between the two pallet forks and comprises the two symmetrically-distributed outer barrels, the inner barrels are movably inserted into the inner cavities of one ends of the outer barrels, the sealing barrels are fixed to the outer sides of the other ends of the outer barrels, and the inner cavities of the sealing barrels can be communicated with the inner cavities of the outer barrels or the inner cavities of the inner barrels by rotating the adjusting rotary disc; therefore, stretching of the inner barrel or stretching of the movable column can be controlled, switching of single supporting and double supporting of the pallet fork and adjustment of the distance are achieved, and therefore the equipment cost and the failure rate are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of forklifts, in particular to a hydraulic distance adjustment system for a forklift fork. Background Art

[0002] During the can manufacturing process, forklifts are usually used for transportation and stacking. According to the actual usage scenario, the forklift's fork needs to switch between single and double forks, and the distance between the forks needs to be adjusted.

[0003] In the prior art, a Chinese utility model with publication number CN201777853U discloses a mounted single and double pallet fork for a forklift, which realizes the clamping, opening and side shifting functions of the entire device by setting a clamping cylinder and a side shifting cylinder and adding two sets of oil circuits and operating a main control valve.

[0004] However, at present, in order to switch between single and double forks and adjust the distance between forks on traditional forklifts, multiple independent oil cylinders and corresponding oil circuits are required, which increases the equipment cost and the failure rate. Therefore, the present invention proposes a hydraulic distance adjustment system for forklifts to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a hydraulic distance adjustment system for a forklift fork, so as to solve the problem in the above background technology that the number of hydraulic cylinders used for adjusting the conventional forks is large and the equipment cost is high.

[0006] To achieve the above object, the present invention provides the following technical solution: a hydraulic distance adjustment system for a forklift fork, comprising: The oil cylinder group, both ends of the oil cylinder group are provided with an inner fork and an outer fork, and the inner fork and the outer fork are both in an "L" shape, and the backs of the inner fork and the outer fork are respectively fixed with a sleeve plate 1 and a sleeve plate 2; The oil cylinder group includes two symmetrically distributed outer cylinders, one end of the outer cylinder is movably inserted into the inner cavity of an inner cylinder, one end of the inner cylinder is movably inserted into the inner cavity of a movable column, one end of the inner cylinder is fixed to a sleeve plate, one end of the movable column movably penetrates the sleeve plate and is fixed to a protrusion, a sealing cylinder is fixed to the outside of the other end of the outer cylinder, a connecting hard pipe for connecting the outer cylinder and the sealing cylinder is arranged between the two, a hydraulic hose is arranged in the inner cavity of the other end of the outer cylinder, and the two ends of the hydraulic hose are respectively connected to the inner cavity of the inner cylinder and the inner cavity of the sealing cylinder, an adjusting dial is rotatably installed in the inner cavity of the sealing cylinder, a through hole is penetrated at the surface edge of the adjusting dial, and the adjusting dial is rotated to connect the through hole to one of the connecting hard pipe and the hydraulic hose.

[0007] Preferably, the connecting hard tubes are arranged in a group of two and the end faces are fitted with an adjusting dial, a sealing gasket is bonded to the surface of the adjusting dial, one end of the hydraulic hose is fixedly inserted into the inner cavity of a connecting hard tube, and the two connecting hard tubes in a group are distributed symmetrically around the center of the adjusting dial.

[0008] Preferably, a sealing plug 1 is fixed to the other end of the inner cylinder, and the sealing plug 1 is slidably installed in the inner cavity of the outer cylinder and adapted thereto, the other end of the hydraulic hose is fixedly passed through the middle of the sealing plug 1, and a sealing plug 2 is fixed to the other end of the movable column, and the sealing plug 2 is slidably installed in the inner cavity of the inner cylinder and adapted thereto.

[0009] Preferably, a limit stop ring is fixed to the inner cavity of the outer cylinder, the middle portion of the hydraulic hose is arranged in a spiral shape, and a spring is arranged on the outer side, the hydraulic hose has the same pitch as the spring, and the corresponding positions are tied and fixed.

[0010] Preferably, a worm gear is provided between the two sealing cylinders, a shaft rod is fixedly provided through the middle of the worm gear, and two ends of the shaft rod movably penetrate the surfaces of the two sealing cylinders and are fixedly connected to the middle of the adjusting dial.

[0011] Preferably, a worm meshing with the worm wheel is disposed on the outer side of the worm wheel, and the worm wheel is driven to rotate by a driving motor, and an oil inlet pipe is fixedly connected to the outer side of the sealing cylinder, and the two oil inlet pipes are merged into one.

[0012] Preferably, guide cylinders are provided on both the upper and lower sides of the cylinder group, and the two ends of the two guide cylinders are fixedly connected by a connecting frame. Guide rods are movably inserted at both ends of the guide cylinders, and a sleeve plate 2 movably mounted on the outside of the guide rod is fixed on the back of the inner fork, and a protrusion 2 fixedly connected to the end of the guide rod is fixed on the back of the outer fork.

[0013] Preferably, a plurality of cross bars distributed at equal intervals are fixed between the two connecting frames, a guide slider is fixed to the surface of the connecting frame, a lifting frame is arranged on the outer side of the guide slider, a guide groove matching the guide slider is opened on the surface of the lifting frame, and the guide slider is slidably installed in the inner cavity of the guide groove.

[0014] Preferably, the guide slider is a vertical long strip structure, the cross-sections of the guide slider and the guide slot are both "T"-shaped, and rollers are rotatably mounted on the end and middle of the guide slider.

[0015] Preferably, the lower ends of the two lifting frames are fixedly connected via a crossbeam, a lifting chain is provided on one side of the lifting frame, a connecting seat is fixed to the side surface of the lower end of the connecting frame, and the lower end of the lifting chain is fixedly connected to the connecting seat.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an oil cylinder group between two groups of forks, the oil cylinder group includes two symmetrically distributed outer cylinders, the inner cavity of one end of the outer cylinder is movably inserted into the inner cylinder, and a sealing cylinder is fixed on the outside of the other end, the inner cavity of one end of the inner cylinder is movably inserted into the movable column, and the inner cavity of the other end of the outer cylinder is provided with a hydraulic hose, the two ends of the hydraulic hose are respectively connected to the inner cavity of the inner cylinder and the inner cavity of the sealing cylinder, the inner cavities of the sealing cylinder and the outer cylinder are connected through a connecting hard pipe, an adjusting dial is rotatably installed in the inner cavity of the sealing cylinder, and a through hole is opened on the surface of the adjusting dial, the inner cavity of the sealing cylinder can be connected to the inner cavity of the outer cylinder or the inner cavity of the inner cylinder by rotating the adjusting dial, so that the extension and retraction of the inner cylinder or the movable column can be controlled, the switching of single and double forks and the adjustment of the spacing are realized, thereby reducing equipment cost and failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the installation of the oil cylinder group structure of the present invention; Figure 4 It is a schematic cross-sectional view of the structure of the oil cylinder group of the present invention; Figure 5 It is a three-dimensional schematic diagram of the hydraulic hose structure of the present invention; Figure 6 It is a three-dimensional schematic diagram of the worm wheel and worm structure of the present invention; Figure 7 This is a schematic diagram of the connection between the worm gear and the adjusting turntable structure of the present invention; Figure 8 This is an exploded schematic diagram of the guide tube structure of the present invention; Fig. 9 It is a schematic diagram of the separation of the guide cylinder and the lifting frame structure of the present invention.

[0018] In the figure: 2, cylinder group; 21, outer cylinder; 211, limit stop ring; 212, connecting hard pipe; 22, inner cylinder; 221, sealing plug 1; 23, movable column; 231, sealing plug 2; 24, sealing cylinder; 241, adjusting dial; 2411, through hole; 2412, sealing gasket; 25, oil inlet pipe; 26, hydraulic hose; 261, spring; 27, worm gear; 271, shaft rod; 28, worm; 29, driving motor; 31, inner fork; 311, sleeve plate 1; 312, sleeve plate 2; 32, outer fork; 321, bump 1; 322, bump 2; 4, guide cylinder; 41, connecting frame; 42, guide rod; 43, cross bar; 44, guide slider; 45, roller; 46, connecting seat; 5, lifting frame; 51, guide slide; 52, lifting chain. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figures 1 to 9 , the present invention provides a technical solution: Embodiment 1, a hydraulic distance adjustment system for a forklift fork, comprises: a cylinder group 2.

[0021] An inner fork 31 and an outer fork 32 are provided at both ends of the oil cylinder group 2, and the inner fork 31 and the outer fork 32 are both in an "L" shape. Figure 2 As shown, an inner fork 31 and an outer fork 32 form a set of forks. The inner fork 31 and the outer fork 32 are separated from each other to adjust the distance between the forks. The two sets of forks can lift and transfer two pallets at the same time. When the inner fork 31 and the outer fork 32 are close to each other until they fit together, the two sets of forks can form a new fork (such as Figure 1 As shown), that is, the switching of single and double fork supports is realized; Specifically, the oil cylinder group 2 includes two symmetrically distributed outer cylinders 21, one end of the inner cavity of the outer cylinder 21 is movably connected with the inner cylinder 22, and the inner cylinder 22 and the outer cylinder 21 form an oil cylinder monomer, one end of the inner cavity of the inner cylinder 22 is movably connected with the movable column 23, and the movable column 23 and the inner cylinder 22 form another oil cylinder monomer, and the two oil cylinder monomers are mutually sleeved and matched, and the number of the overall structure is less than that of two separate oil cylinders, which can reduce the equipment cost on the one hand, and reduce the space occupied on the other hand, so that it can be installed and used in a more compact space environment; Secondly, a sleeve plate 1 311 and a sleeve plate 2 312 are fixed to the back of the inner fork 31 and the outer fork 32 respectively, one end of the inner cylinder 22 is fixed to the sleeve plate 1 311, one end of the movable column 23 movably penetrates the sleeve plate 1 311 and is fixed to the protrusion 1 321, when the movable column 23 is extended and retracted, the movable column 23 can drive the outer fork 32 to move horizontally alone, so as to adjust the distance between the inner fork 31 and the outer fork 32, when the inner cylinder 22 is extended and retracted, the movable column 23 and the inner cylinder 22 remain relatively fixed, at this time, the inner fork 31 and the outer fork 32 can move synchronously in the same direction, so when the device is installed on a forklift and the single or double fork is switched, the distance between the forks can be adjusted according to actual needs; Furthermore, a sealing cylinder 24 is fixed to the outside of the other end of the outer cylinder 21, and a connecting hard pipe 212 is provided between the outer cylinder 21 and the sealing cylinder 24 for connecting the two. A hydraulic hose 26 is provided in the inner cavity of the other end of the outer cylinder 21, and the two ends of the hydraulic hose 26 are connected to the inner cavity of the inner cylinder 22 and the inner cavity of the sealing cylinder 24, respectively. Figure 4 As shown, the hydraulic oil in the inner cavity of the sealing cylinder 24 can enter the inner cavity of the outer cylinder 21 through the connecting hard pipe 212, or enter the inner cavity of the inner cylinder 22 through the hydraulic hose 26. By controlling the opening and closing of the connecting hard pipe 212 and the hydraulic hose 26, as well as the oil pressure of the hydraulic oil, the extension and contraction of the inner cylinder 22 and the movable column 23 can be controlled. In addition, an adjusting dial 241 is rotatably installed in the inner cavity of the sealing cylinder 24. A through hole 2411 is opened through the edge of the surface of the adjusting dial 241. The adjusting dial 241 is rotated to connect the through hole 2411 to one of the connecting hard pipe 212 and the hydraulic hose 26, as shown in FIG. Figure 4 and Figure 7 As shown, when the through hole 2411 is located at the upper position of the adjusting dial 241, the through hole 2411 is connected to the inner cavity of the hard tube 212, and when the through hole 2411 is located at the lower position of the adjusting dial 241, the through hole 2411 is connected to the inner cavity of the hydraulic hose 26; The use of this device is as follows: ① Rotate the adjusting dial 241 to place the through hole 2411 at the upper part of the adjusting dial 241. At this time, the through hole 2411 is connected to the inner cavity of the outer cylinder 21 through the connecting hard tube 212. The hydraulic oil pressure in the inner cavity of the sealing cylinder 24 is controlled by the external hydraulic oil pump, so that the inner cylinder 22 can be driven to extend and retract. Since the oil pressure in the inner cavity of the inner cylinder 22 is kept stable, the movable column 23 is relatively fixed to the inner cylinder 22, and the movable column 23 moves synchronously with the inner cylinder 22, that is, at this time, the two inner forks 31 are close to or away from each other, and the relative position of the outer fork 32 and the inner fork 31 remains unchanged; ② Rotate the adjusting dial 241 to place the through hole 2411 at the lower part of the adjusting dial 241. At this time, the through hole 2411 is connected to the inner cavity of the inner cylinder 22 through the hydraulic hose 26. The hydraulic oil pressure in the inner cavity of the sealing cylinder 24 is controlled by the external hydraulic oil pump, so that the movable column 23 can be driven to extend and retract, and the inner cylinder 22 and the outer cylinder 21 remain relatively fixed, that is, at this time, the two outer forks 32 are close to or away from each other, and the position of the inner fork 31 itself remains unchanged; In summary, the above two points can ensure that the distance between the forks of the device can be adjusted when the forks are switched between the single-support and double-support states.

[0022] In order to facilitate the installation of one end of the hydraulic hose 26, the connecting hard tube 212 of the present application is provided in groups of two and the end faces are fitted with the adjusting dial 241. The surface of the adjusting dial 241 is bonded with a sealing gasket 2412 to ensure the sealing between the surface of the adjusting dial 241 and the end face of the connecting hard tube 212. When the through hole 2411 and the connecting hard tube 212 are misaligned with each other, the inner cavity of the connecting hard tube 212 and the inner cavity of the sealing cylinder 24 can be disconnected, and one end of the hydraulic hose 26 is fixedly plugged into the inner cavity of a connecting hard tube 212, such as Figure 4 As shown, although two connecting hard tubes 212 are arranged between the outer cylinder 21 and the sealing cylinder 24 for communication, since the inner cavity of the connecting hard tube 212 located on the lower side is inserted by one end of the hydraulic hose 26, the connecting hard tube 212 located on the lower side cannot be communicated with the inner cavity of the outer cylinder 21, but is communicated with the inner cavity of the inner cylinder 22 via the hydraulic hose 26. The connecting hard tubes 212 described above all refer to the connecting hard tubes 212 located on the upper side. The two connecting hard tubes 212 are arranged mainly to ensure that their end faces are sealed and fitted with the surface of the adjusting dial 241. On the other hand, it is convenient to install and fix the end of the hydraulic hose 26. In addition, a group of two connecting hard tubes 212 are centrally symmetrically distributed around the center of the adjusting dial 241. Therefore, when the adjusting dial 241 rotates, the connecting hard tubes 212 can correspond to the through holes 2411.

[0023] In order to control the extension and contraction of the inner cylinder 22 and the movable column 23, the present application also has a sealing plug 221 fixed at the other end of the inner cylinder 22, the sealing plug 221 is slidably mounted in the inner cavity of the outer cylinder 21 and adapted thereto, the other end of the hydraulic hose 26 is fixedly passed through the middle of the sealing plug 221, and the other end of the movable column 23 is fixed with a sealing plug 231, the sealing plug 231 is slidably mounted in the inner cavity of the inner cylinder 22 and adapted thereto, as shown in FIG. Figure 4 As shown, sealing plug 1 221 and sealing plug 2 231 are both made of rubber material and have good sealing effect, which can prevent hydraulic oil leakage. When the hydraulic oil pressure in the inner cavity of the other end of the outer cylinder 21 changes, sealing plug 1 221 slides in the inner cavity of the outer cylinder 21 and drives the inner cylinder 22 and the movable column 23 to move synchronously. When the oil pressure at the other end of the inner cylinder 22 changes, sealing plug 231 slides in the inner cavity of the inner cylinder 22 and drives the movable column 23 to move alone.

[0024] In order to fold and organize the hydraulic hose 26, the present application also has a limited stop ring 211 fixed in the inner cavity of the outer tube 21, the middle part of the hydraulic hose 26 is set in a spiral shape, and a spring 261 is set on the outside. The pitch of the hydraulic hose 26 and the spring 261 are consistent, and the corresponding positions are tied and fixed, such as Figure 4 and Figure 5As shown, the spiral hydraulic hose 26 can be stretched or shortened within a certain distance, so as to adapt to the movement of the sealing plug 221, and ensure that when the sealing plug 221 moves, the inner cavity of the inner cylinder 22 can always maintain communication with the inner cavity of the hydraulic hose 26, and by adding a spring 261 on the outside of the hydraulic hose 26, the elastic deformation of the spring 261 itself can be used to reset the hydraulic hose 26. When the inner cylinder 22 shrinks and drives the sealing plug 221 to approach the inner wall of the other end of the outer cylinder 21, the space volume of the inner cavity of the other end of the outer cylinder 21 gradually decreases, and the spring 261 drives the hydraulic hose 26 to shrink and fold, which on the one hand reduces the space occupied, and on the other hand avoids the hydraulic hose 26 from generating an angle in the middle part thereof, which may cause breakage or damage, or affect the normal flow of the subsequent hydraulic oil in the inner cavity of the hydraulic hose 26. In addition, the setting of the limit ring 211 can be used to control the sliding stroke of the sealing plug 221, and ensure that a certain distance is left between the sealing plug 221 and the inner wall of the other end of the outer cylinder 21 for the placement of the hydraulic hose 26.

[0025] In order to drive the two adjusting dials 241 to rotate synchronously in the same direction, the present application also has a worm gear 27 disposed between the two sealing cylinders 24, a shaft 271 is fixedly provided through the middle of the worm gear 27, and both ends of the shaft 271 are respectively movable through the surfaces of the two sealing cylinders 24 and are fixedly connected to the middle of the adjusting dial 241. Figure 4 and Figure 7 As shown, when the worm wheel 27 rotates, the two adjusting dials 241 can be driven to rotate synchronously through the shaft 271, thereby ensuring that the telescopic states of the two ends of the cylinder group 2 of the device are consistent and synchronous.

[0026] In order to drive the worm wheel 27 to rotate, the present application also has a worm 28 meshing with the worm wheel 27 disposed on the outer side of the worm wheel 27, and the worm 28 is driven to rotate by a driving motor 29. When the driving motor 29 is working, the worm 28 is driven to rotate, thereby driving the worm wheel 27 to rotate. Since the meshing transmission between the worm 28 and the worm wheel 27 is unidirectional, when the driving motor 29 stops working, the worm wheel 27 can be positioned and cannot drive the worm 28 to rotate. An oil inlet pipe 25 is fixedly connected to the outer side of the sealing cylinder 24, and the two oil inlet pipes 25 are merged into one, such as Figure 4 and Figure 6 As shown, the end of the oil inlet pipe 25 is connected to an external hydraulic oil pump known in the prior art to ensure that the oil pressures in the inner chambers of the two sealing cylinders 24 can change consistently.

[0027] In order to guide the movement of the inner fork 31 and the outer fork 32, the present application also has guide cylinders 4 arranged on both the upper and lower sides of the oil cylinder group 2, the two ends of the two guide cylinders 4 are fixedly connected by a connecting frame 41, and the two ends of the guide cylinders 4 are movably plugged with guide rods 42, and the back of the inner fork 31 is fixed with a sleeve plate 312 movably sleeved on the outside of the guide rod 42, and the back of the outer fork 32 is fixed with a protrusion 322 fixedly connected to the end of the guide rod 42, such as Figure 8 As shown, the guide rod 42 can only telescope and slide in the inner cavity at the end of the guide cylinder 4, and the sleeve plate 312 can only slide on the outside of the guide rod 42 along the length direction of the guide rod 42. In other words, the coordinated arrangement of the guide cylinder 4, the guide rod 42, and the sleeve plate 312 can guide the movement of the inner fork 31 and the outer fork 32, and at the same time, avoid bending and damage to the cylinder group 2 as a whole.

[0028] In order to lift the fork, the present application also has a plurality of cross bars 43 fixed between the two connecting frames 41 and distributed at equal intervals, which are used to improve the stability of the connection between the guide cylinder 4 and the connecting frame 41, and a guide slider 44 is fixed on the surface of the connecting frame 41, and a lifting frame 5 is arranged on the outer side of the guide slider 44, and a guide groove 51 matched with the guide slider 44 is opened on the surface of the lifting frame 5, and the guide slider 44 is slidably installed in the inner cavity of the guide groove 51, and the guide slider 44 can only slide up and down in the inner cavity of the guide groove 51 along the length direction of the lifting frame 5, thereby driving the guide cylinder 4 to move up and down, and then realizing the lifting and lowering of the inner fork 31 and the outer fork 32, that is, realizing the lifting and lowering of the fork of the present device.

[0029] In order to make the lifting and lowering of the fork smoother, the guide slider 44 of the present application is a vertical long strip structure. After the guide slider 44 cooperates with the guide slot 51, it can effectively prevent the fork of the present device from tilting in the vertical direction. The cross-sections of the guide slider 44 and the guide slot 51 are both "T"-shaped, which can prevent the guide slider 44 from detaching from the inner cavity of the guide slot 51. Rollers 45 are rotatably installed at the end and middle of the guide slider 44, which can be used to reduce the friction generated when the guide slider 44 slides in the inner cavity of the guide slot 51, thereby ensuring that the lifting and lowering process of the fork of the present device is smoother.

[0030] In order to lift and lower the guide cylinder 4, the lower ends of the two lifting frames 5 of the present application are fixedly connected by a cross beam, and the upper ends of the two lifting frames 5 are fixed by another cross beam. A lifting chain 52 is arranged on one side of the lifting frame 5, a connecting seat 46 is fixed to the side of the lower end of the connecting frame 41, the lower end of the lifting chain 52 is fixedly connected to the connecting seat 46, and a sprocket wheel matched with the lifting chain 52 is arranged on the cross beam at the upper end of the lifting frame 5. The lifting chain 52 is wound up by the rotation of the sprocket wheel, thereby realizing the lifting of the guide cylinder 4. Conversely, the lifting chain 52 can be unwound to lower the guide cylinder 4.

[0031] 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 hydraulic distance adjustment system for a forklift, characterized in that: include: An oil cylinder group (2), wherein both ends of the oil cylinder group (2) are provided with an inner fork (31) and an outer fork (32), and the inner fork (31) and the outer fork (32) are both in an "L" shape, and a first sleeve plate (311) and a second sleeve plate (312) are fixed to the backs of the inner fork (31) and the outer fork (32), respectively; The oil cylinder group (2) comprises two symmetrically distributed outer cylinders (21), one end of the inner cavity of the outer cylinder (21) is movably connected to the inner cylinder (22), one end of the inner cavity of the inner cylinder (22) is movably connected to the movable column (23), one end of the inner cylinder (22) is fixed to the sleeve plate (311), one end of the movable column (23) movably penetrates the sleeve plate (311) and is fixed to the protrusion (321), the other end of the outer cylinder (21) is fixed to the outer side of the sealing cylinder (24), and a useful A connecting hard pipe (212) is provided to connect the two, the inner cavity of the other end of the outer cylinder (21) is provided with a hydraulic hose (26), the two ends of the hydraulic hose (26) are respectively connected to the inner cavity of the inner cylinder (22) and the inner cavity of the sealing cylinder (24), an adjusting dial (241) is rotatably installed in the inner cavity of the sealing cylinder (24), a through hole (2411) is penetrated and opened at the edge of the surface of the adjusting dial (241), and the adjusting dial (241) is rotated to connect the through hole (2411) to one of the connecting hard pipe (212) and the hydraulic hose (26); A worm wheel (27) is provided between the two sealing cylinders (24), a shaft rod (271) is fixedly provided through the middle of the worm wheel (27), and two ends of the shaft rod (271) respectively movably penetrate the surfaces of the two sealing cylinders (24) and are fixedly connected to the middle of the adjusting turntable (241); A worm (28) meshing with the worm wheel (27) is disposed on the outside of the worm wheel (27), and the worm (28) is driven to rotate by a driving motor (29). An oil inlet pipe (25) is fixedly connected to the outside of the sealing cylinder (24), and the two oil inlet pipes (25) are combined into one.

2. A forklift fork hydraulic distance adjustment system according to claim 1, characterized in that: The connecting hard tubes (212) are arranged in groups of two and their end faces are in contact with the adjusting dial (241). A sealing gasket (2412) is bonded to the surface of the adjusting dial (241). One end of the hydraulic hose (26) is fixedly plugged into the inner cavity of a connecting hard tube (212). The two connecting hard tubes (212) in a group are centrally symmetrically distributed around the center of the adjusting dial (241).

3. A forklift fork hydraulic distance adjustment system according to claim 2, characterized in that: A sealing plug 1 (221) is fixed to the other end of the inner cylinder (22), and the sealing plug 1 (221) is slidably mounted in the inner cavity of the outer cylinder (21) and is compatible therewith. The other end of the hydraulic hose (26) is fixedly passed through the middle of the sealing plug 1 (221). A sealing plug 2 (231) is fixed to the other end of the movable column (23), and the sealing plug 2 (231) is slidably mounted in the inner cavity of the inner cylinder (22) and is compatible therewith.

4. A forklift fork hydraulic distance adjustment system according to claim 3, characterized in that: A limit stop ring (211) is fixed to the inner cavity of the outer cylinder (21); the middle portion of the hydraulic hose (26) is arranged in a spiral shape, and a spring (261) is arranged on the outer side; the hydraulic hose (26) and the spring (261) have the same pitch, and are fastened and fixed at corresponding positions.

5. The hydraulic distance adjustment system for a forklift according to claim 1, characterized in that: Guide cylinders (4) are provided on both upper and lower sides of the oil cylinder group (2); the two ends of the two guide cylinders (4) are fixedly connected via a connecting frame (41); guide rods (42) are movably inserted at both ends of the guide cylinders (4); a second sleeve plate (312) movably sleeved on the outside of the guide rod (42) is fixed on the back of the inner fork (31); and a second protrusion (322) fixedly connected to the end of the guide rod (42) is fixed on the back of the outer fork (32).

6. A forklift fork hydraulic distance adjustment system according to claim 5, characterized in that: A plurality of cross bars (43) are fixed between the two connecting frames (41) and are distributed at equal intervals. A guide slider (44) is fixed on the surface of the connecting frame (41). A lifting frame (5) is arranged on the outer side of the guide slider (44). A guide groove (51) matching the guide slider (44) is provided on the surface of the lifting frame (5). The guide slider (44) is slidably mounted in the inner cavity of the guide groove (51).

7. The hydraulic distance adjustment system for a forklift according to claim 6, characterized in that: The guide slider (44) is a vertical long strip structure. The cross-sections of the guide slider (44) and the guide slot (51) are both T-shaped. Rollers (45) are rotatably mounted on the end and middle of the guide slider (44).

8. The hydraulic distance adjustment system for a forklift according to claim 7, characterized in that: The lower ends of the two lifting frames (5) are fixedly connected via a crossbeam, a lifting chain (52) is provided on one side of the lifting frame (5), a connecting seat (46) is fixed on the side of the lower end of the connecting frame (41), and the lower end of the lifting chain (52) is fixedly connected to the connecting seat (46).

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