Hydraulic control system of side-shifting single-prong distance-adjusting forklift truck with self-locking function and forklift truck

Abstract

This invention discloses a hydraulic control system and forklift with self-locking function for a side-shifting single-fork adjustable forklift. The hydraulic control system includes an oil pump, a multi-way valve, a right fork adjustable cylinder, a left fork adjustable cylinder, a two-way hydraulic lock, and an oil tank. The first working port A1 of the multi-way valve is connected to the rodless chamber of the right fork adjustable cylinder; the second working port B1 of the multi-way valve is connected to the first interface of the second tee pipe; the second interface of the second tee pipe is connected to the rodless chamber of the left fork adjustable cylinder; the third interface of the second tee pipe is connected to the fourth working port C2 of the two-way hydraulic lock; the third working port A2 of the multi-way valve is connected to the first working port V1 of the two-way hydraulic lock; and the fourth working port B2 of the multi-way valve is connected to the second working port V2 of the two-way hydraulic lock. This invention solves the problem of one cylinder continuing to operate after the other has reached its stroke position during side-shifting operation by setting a two-way hydraulic lock in the attachment hydraulic circuit, thus improving the safety of side-shifting operation.

Description

Technical Field

[0001] This invention relates to the field of forklift technology, and in particular to a hydraulic control system and forklift for a side-shift single-fork adjustable forklift with self-locking function. Background Technology

[0002] Forklifts primarily use forks to lift and move materials. Forklifts are typically equipped with various attachments to expand their application range and meet the requirements of different operating environments. Side-shift adjustable forks are a commonly used attachment on forklifts. They work by using a multi-way valve to supply oil to an adjusting cylinder, which in turn moves the forks to achieve lateral movement and distance adjustment. For example... Figure 2 As shown, the first attachment reversing valve 4 reverses direction to move the forks to the left and right, while the second attachment reversing valve 10 reverses direction to adjust the distance of the left fork's adjusting cylinder. Because it's a single fork adjusting system, the actual stroke of the left and right fork adjusting cylinders cannot be guaranteed to be exactly the same (theoretically, the design stroke is the same). The main shortcomings of the existing side-shifting single-fork adjusting attachment hydraulic system are as follows:

[0003] (1) The first attachment reversing valve plate 4 reverses the operation. When the fork moves to the right, oil enters the rodless chamber of the right fork pitch cylinder 5, pushing the piston rod of the right fork pitch cylinder 5 to drive the fork to move to the right. The pressure oil output from the rod chamber of the right fork pitch cylinder 5 reaches the rod chamber of the left fork pitch cylinder 6 through the first three-way pipe 7, pushing the piston rod of the left fork pitch cylinder 6 to drive the fork to move to the right. The oil returning from the rodless chamber of the left fork pitch cylinder flows back to the oil tank through the first attachment reversing valve plate 4. If the travel of the right fork adjusting cylinder 5 is greater than that of the left fork adjusting cylinder 6, the left fork adjusting cylinder 6 will reach its destination before the right fork adjusting cylinder 5 reaches its destination. The first attachment directional valve 4 will still be in the directional operation state, causing the pressure in the rodless chamber of the right fork adjusting cylinder 5 to rise. The pressure in the rod chamber will also rise. Because the area ratio of the rodless chamber to the rod chamber of the right fork adjusting cylinder 5 is greater, the pressure in the rod chamber is greater than the pressure in the rodless chamber. When the pressure rises to the pressure set by the first overload valve replenishing valve 13, which is connected to the rod chamber pipeline of both cylinders, the first overload valve replenishing valve 13 will fully open to overflow and return oil. The right fork adjusting cylinder 5 will continue to move to the right. This poses a significant danger to the loaded side movement of the forks and presents a safety hazard.

[0004] (2) The first attachment reversing valve plate 4 reversing operation has the same problem when the forks move to the left.

[0005] (3) Although this problem can be solved by adjusting and increasing the pressure of the first overload valve replenishing valve 13, it will bring new problems. When the single fork offset action is performed, when the single fork offset stroke is in place, because the oil passage of the first overload valve replenishing valve 13 is connected to the rod chamber of the left and right fork offset cylinders, the excessive pressure will also cause the other cylinder to drive the fork to move, which also poses a safety hazard. Summary of the Invention

[0006] Based on the technical problems existing in the background technology, the present invention proposes a hydraulic control system and forklift with self-locking function for a side-shifting single-fork adjustable forklift. By setting a two-way hydraulic lock in the attachment oil circuit, the problem of the other cylinder continuing to operate after one cylinder has reached its stroke position during side-shifting operation is solved, thereby improving the safety of side-shifting operation.

[0007] The hydraulic control system for a side-shift single-fork adjustable forklift with self-locking function proposed in this invention includes an oil pump, a multi-way valve, a right fork adjustable cylinder, a left fork adjustable cylinder, a two-way hydraulic lock, and an oil tank.

[0008] The oil pump's suction port is connected to the oil, and the oil pump's outlet port is connected to the multi-way valve's inlet port P.

[0009] The bidirectional hydraulic lock includes four working ports, namely the first working port V1, the second working port V2, the third working port C1, and the fourth working port C2.

[0010] The first working port A1 of the multi-way valve is connected to the rodless chamber of the right fork offset cylinder; the second working port B1 of the multi-way valve is connected to the first interface of the second three-way pipe; the second interface of the second three-way pipe is connected to the rodless chamber of the left fork offset cylinder; the third interface of the second three-way pipe is connected to the fourth working port C2 of the bidirectional hydraulic lock; the third working port A2 of the multi-way valve is connected to the first working port V1 of the bidirectional hydraulic lock; and the fourth working port B2 of the multi-way valve is connected to the second working port V2 of the bidirectional hydraulic lock.

[0011] The third working C1 of the bidirectional hydraulic lock is connected to the first interface of the first three-way pipe, the second interface of the first three-way pipe is connected to the rod chamber of the right fork offset cylinder, and the third interface of the first three-way pipe is connected to the rod chamber of the left fork offset cylinder.

[0012] Preferably, the multi-way valve includes a first attachment reversing valve plate and a second attachment reversing valve plate. The first attachment reversing valve plate is connected to a first working oil port A1 and a second working oil port B1. The second attachment reversing valve plate is connected to a third working oil port A2 and a fourth working oil port B2. The oil inlet P of the multi-way valve is divided into two paths through an internal oil circuit. One path is connected to the inlet of a safety valve, and the outlet of the safety valve is connected to the oil. The other path is connected to the oil inlet of the first attachment reversing valve plate and the second attachment reversing valve plate.

[0013] Preferably, the third working port A2 of the second accessory reversing valve plate is connected to the inlet of the first overload valve replenishing valve through a third three-way pipe, the outlet of the first overload replenishing valve is connected to the annular return oil passage, the fourth working port B2 of the second accessory reversing valve plate is connected to the inlet of the second overload replenishing valve through a fourth three-way pipe, the outlet of the second overload replenishing valve is connected to the annular return oil passage; the annular return oil passage is connected to the return port T of the multi-way valve, and the return port T is connected to the oil tank.

[0014] Preferably, when the first and second attachment directional valve plates are in the neutral position, the oil inlet P of the multi-way valve is connected to the oil return port T of the multi-way valve through the neutral oil passage of the first and second attachment directional valve plates, and the oil return port T is connected to the oil tank.

[0015] Preferably, the first attachment reversing valve plate and the second attachment reversing valve plate are connected in parallel.

[0016] Preferably, when the first working port V1 of the bidirectional hydraulic lock is supplied with pressurized oil, the first working port V1 is connected to the third working port C1, and the fourth working port C2 is connected to the second working port V2 in reverse through the internal control oil circuit connected to the first working port V1 of the bidirectional hydraulic lock; when the second working port V2 of the bidirectional hydraulic lock is supplied with pressurized oil, the second working port V2 is connected to the fourth working port C2, and the third working port C1 is connected to the first working port V1 in reverse through the internal control oil circuit connected to the second working port V2 of the bidirectional hydraulic lock; conversely, when the third working port C1 or the fourth working port C2 of the bidirectional hydraulic lock is supplied with pressurized oil, the bidirectional hydraulic lock is reverse-cut off, the third working port C1 is not connected to the first working port V1, and the fourth working port C2 is also not connected to the second working port V2.

[0017] The forklift proposed in this invention includes the aforementioned hydraulic control system for a side-shifting single-fork adjustable forklift with self-locking function.

[0018] Beneficial technical effects of the present invention:

[0019] 1. This invention solves the problem of one cylinder continuing to operate after the other cylinder has reached its stroke position during lateral movement by setting a two-way hydraulic lock in the attachment oil circuit, thereby improving the safety of lateral movement.

[0020] 2. This invention utilizes two hydraulic cylinders and, through the conversion design of the attachment hydraulic circuit, can not only achieve the lateral movement function but also the single fork pitch adjustment function. The system has a simple structure, comprehensive functions, and is easy to operate.

[0021] 3. This invention improves the service life of attachments by installing an overload valve and a replenishing valve in the attachment's oil circuit to prevent damage to the oil cylinder caused by excessive pressure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the hydraulic control system for a side-shifting single-fork adjustable forklift with self-locking function proposed in this invention.

[0023] Figure 2 This is a schematic diagram of the hydraulic system for an existing side-shifting single-fork adjustable attachment.

[0024] In the diagram: 1-oil pump, 2-safety valve, 3-multi-way valve, 4-first attachment directional valve plate, 5-right fork adjusting cylinder, 6-left fork adjusting cylinder, 7-first tee pipe, 8-second tee pipe, 9-two-way hydraulic lock, 10-second attachment directional valve plate, 11-third tee pipe, 12-fourth tee pipe, 13-first overload replenishing valve, 14-second overload replenishing valve, 15-annular return oil passage, 16-oil tank. Detailed Implementation

[0025] The present invention will be further explained below with reference to specific embodiments.

[0026] Example 1

[0027] Reference Figure 1 The present invention proposes a hydraulic control system for a side-shift single-fork adjustable forklift with self-locking function.

[0028] The hydraulic control system for a side-shift single-fork adjustable forklift with self-locking function proposed in this invention includes an oil pump 1, a multi-way valve 3, a right fork adjustable cylinder 5, a left fork adjustable cylinder 6, a two-way hydraulic lock 9, and an oil tank 16.

[0029] The oil pump 1's suction port is connected to the oil phase 16, and the oil pump 1's outlet port is connected to the inlet P of the multi-way valve 3.

[0030] The bidirectional hydraulic lock 9 includes four working ports, namely the first working port V1, the second working port V2, the third working port C1, and the fourth working port C2.

[0031] The first working port A1 of the multi-way valve 3 is connected to the rodless chamber of the right fork pitch cylinder 5; the second working port B1 of the multi-way valve 3 is connected to the first interface of the second three-way pipe 8; the second interface of the second three-way pipe 8 is connected to the rodless chamber of the left fork pitch cylinder 6; the third interface of the second three-way pipe 8 is connected to the fourth working port C2 of the bidirectional hydraulic lock 9; the third working port A2 of the multi-way valve is connected to the first working port V1 of the bidirectional hydraulic lock 9; and the fourth working port B2 of the multi-way valve is connected to the second working port V2 of the bidirectional hydraulic lock 9.

[0032] The third working C1 of the two-way hydraulic lock 9 is connected to the first interface of the first three-way pipe 7, the second interface of the first three-way pipe 7 is connected to the rod chamber of the right fork offset cylinder 5, and the third interface of the first three-way pipe 7 is connected to the rod chamber of the left fork offset cylinder 6.

[0033] The multi-way valve 3 includes a first attachment reversing valve plate 4 and a second attachment reversing valve plate 10. The first attachment reversing valve plate 4 is connected to a first working oil port A1 and a second working oil port B1. The second attachment reversing valve plate 10 is connected to a third working oil port A2 and a fourth working oil port B2. The oil inlet P of the multi-way valve 3 is divided into two paths through the internal oil circuit. One path is connected to the inlet of the safety valve 2. The outlet of the safety valve 2 is connected to the oil tank 16 through the annular return oil passage (15) of the multi-way valve (3) and the return oil port T of the multi-way valve (3). The other path is connected to the oil inlet of the first attachment reversing valve plate 4 and the second attachment reversing valve plate 10.

[0034] The third working port A2 of the second attachment reversing valve plate 10 is connected to the inlet of the first overload replenishing valve 13 through the third three-way pipe 11. The outlet of the first overload replenishing valve 13 is connected to the annular return oil passage 15. The fourth working port B2 of the second attachment reversing valve plate 10 is connected to the inlet of the second overload replenishing valve 14 through the fourth three-way pipe 12. The outlet of the second overload replenishing valve 14 is connected to the annular return oil passage 15. The annular return oil passage 15 is connected to the return oil port T of the multi-way valve 3. The return oil port T is connected to the oil tank 16.

[0035] When the first attachment directional valve plate 4 and the second attachment directional valve plate 10 are in the neutral position, the oil inlet P of the multi-way valve 3 is connected to the oil return port T of the multi-way valve 3 through the neutral position oil passage of the first attachment directional valve plate 4 and the second attachment directional valve plate 10, and the oil return port T is connected to the oil tank 16.

[0036] The first attachment reversing valve plate 4 and the second attachment reversing valve plate 10 are connected in parallel.

[0037] When pressure oil is supplied to the first working port V1 of the bidirectional hydraulic lock 9, the first working port V1 is connected to the third working port C1. Through the internal control oil circuit connecting the bidirectional hydraulic lock 9 and the first working port V1, the fourth working port C2 is connected to the second working port V2 in reverse. When pressure oil is supplied to the second working port V2 of the bidirectional hydraulic lock 9, the second working port V2 is connected to the fourth working port C2. Through the internal control oil circuit connecting the bidirectional hydraulic lock 9 and the second working port V2, the third working port C1 is connected to the first working port V1 in reverse. Conversely, when pressure oil is supplied to either the third working port C1 or the fourth working port C2 of the bidirectional hydraulic lock 9, the bidirectional hydraulic lock 9 is reverse-cut off, and the third working port C1 is not connected to the first working port V1, nor is the fourth working port C2 connected to the second working port V2.

[0038] Working principle:

[0039] During operation, when the forks do not need to move, both the first attachment directional valve plate 4 and the second attachment directional valve plate 10 are in the neutral position; the hydraulic oil output by the oil pump 1 flows back to the hydraulic oil tank 16 through the neutral position oil passage of the multi-way valve 3.

[0040] When the forklift forks move to the side, the first attachment reversing valve 4 is in the reversing position. When the pressure oil output by the oil pump 1 is connected to the first working port A1 of the first attachment reversing valve 4 through the inlet P of the multi-way valve 3, the pressure oil output by the oil pump 1 reaches the rodless chamber of the right fork adjusting cylinder 5 through the first working port A1 of the first attachment reversing valve 4, pushing the piston rod of the right fork adjusting cylinder 5 to move the forks to the right. The pressure oil output by the rod chamber of the right fork adjusting cylinder 5 reaches the rod chamber of the left fork adjusting cylinder 6 through the three-way pipe 7, pushing the piston rod of the left fork adjusting cylinder 6 to move the forks to the right. The pressure oil output by the rodless chamber of the left fork adjusting cylinder 6 flows back to the oil tank through the three-way pipe 8 and the second working port B1 of the first attachment reversing valve 4, thus realizing the right-side movement of the forks. Similarly, when the pressure oil output by the oil pump 1 is connected to the second working port B1 of the first attachment reversing valve plate 4, the pressure oil output by the oil pump 1 passes through the second working port B1 of the first attachment reversing valve plate 4, the second interface of the three-way pipe 8, and reaches the rodless chamber of the left fork adjusting cylinder 6, pushing the piston rod of the left fork adjusting cylinder 6 to move the fork to the left. The pressure oil output from the rod chamber of the left fork adjusting cylinder 6 passes through the three-way pipe 7 to reach the rod chamber of the right fork adjusting cylinder 5, pushing the piston rod of the right fork adjusting cylinder 5 to move the fork to the left. The pressure oil output from the rodless chamber of the left fork adjusting cylinder 5 flows back to the oil tank through the first working port A1 of the first attachment reversing valve plate 4; thus realizing the leftward movement of the fork.

[0041] When the forklift forks need to adjust the fork distance, the second attachment directional valve 10 is in the reversing position. When the pressure oil output by the oil pump 1 is connected to the third working port A2 of the second attachment directional valve 10, the pressure oil output by the oil pump 1 passes through the third working port A2 of the second attachment directional valve 10, the first working port V1 of the two-way hydraulic lock 9, and the third working port C1 of the two-way hydraulic lock 9, reaching the rod chamber of the left fork adjustment cylinder 6. This pushes the piston rod of the left fork adjustment cylinder 6, causing the fork to move to the right. The rodless chamber of the left fork adjustment cylinder 6... The output pressure oil reaches the fourth working port C2 of the two-way hydraulic lock 9 through the third interface of the three-way pipe 8. Since the first working port V1 of the two-way hydraulic lock 9 is connected to pressure oil, the internal control oil circuit of the two-way hydraulic lock 9 is connected to the first working port V1. The fourth working port C2 is connected to the second working port V2 in reverse. Therefore, the pressure oil output from the rodless chamber of the left fork pitching cylinder 6 flows back to the oil tank through the fourth working port C2 of the two-way hydraulic lock 9, through the second working port V2, and the fourth working port B2 of the second attachment reversing valve plate 10. Similarly, when the pressure oil output by oil pump 1 is connected to the fourth working port B2 of the second attachment directional valve plate 10, the pressure oil output by oil pump 1 reaches the rodless chamber of the left fork adjusting cylinder 6 through the fourth working port B2 of the second attachment directional valve plate 10, the second working port V2 of the two-way hydraulic lock 9, the fourth working port C2 of the two-way hydraulic lock 9, and the second interface of the three-way pipe 8. This pushes the piston rod of the left fork adjusting cylinder 6 to move the fork to the left. The pressure oil output from the rod chamber of the left fork adjusting cylinder 6 passes through the three-way pipe. The first interface of pipe 7 reaches the third working port C1 of the bidirectional hydraulic lock 9. Since the second working port V2 of the bidirectional hydraulic lock 9 is supplied with pressurized oil, the internal control oil circuit connecting the bidirectional hydraulic lock 9 and the second working port V2, and the third working port C1 being in reverse connection with the first working port V1, allow the pressurized oil output from the rod chamber of the left fork offset cylinder 6 to flow back to the oil tank through the third working port C1 of the bidirectional hydraulic lock 9, the first working port V1, and the third working port A2 of the second attachment directional valve plate 10. This achieves single fork offset adjustment.

[0042] During the movement to the right, when the travel of the right fork adjusting cylinder 5 is greater than that of the left fork adjusting cylinder 6, the left fork adjusting cylinder 6 reaches its travel position first, while the right fork adjusting cylinder 5 has not yet reached its travel position. The first attachment directional valve plate 4 is still in the directional operation state, and the pressure in the rodless chamber of the right fork adjusting cylinder 5 increases. The pressure in the rod chamber of the right fork adjusting cylinder 5 also increases accordingly. Because the rod chamber of the right fork adjusting cylinder 5 is connected to the third working port C1 of the two-way hydraulic lock 9, the two-way hydraulic lock 9 is reverse-cut off, and C1 and V1 are not connected. Therefore, the right fork adjusting cylinder 5 remains stationary. Similarly, during the leftward movement, when the stroke of the left fork adjusting cylinder 6 is greater than that of the right fork adjusting cylinder 5, the right fork adjusting cylinder 5 reaches its position first, while the left fork adjusting cylinder 6 has not yet reached its position. The first attachment directional valve 4 is still in the directional operation state, causing the pressure in the rodless chamber of the left fork adjusting cylinder 6 to rise. The pressure in the rod-side chamber of the left fork adjusting cylinder 6 also rises accordingly. Because the rod-side chamber of the left fork adjusting cylinder 6 is connected to the third working port C1 of the two-way hydraulic lock 9, the two-way hydraulic lock 9 is reverse-locked, and C1 and V1 are not connected. Therefore, the left fork adjusting cylinder 5 remains stationary. Simultaneously, during the leftward movement, the fourth working port C2 of the two-way hydraulic lock 9, which is connected to the rodless chamber of the left fork adjusting cylinder 6, is supplied with pressurized oil. The two-way hydraulic lock 9 is reverse-locked, and C2 and V2 are not connected. This ensures the safety of the lateral movement operation.

[0043] Example 2

[0044] The forklift proposed in this invention includes the hydraulic control system for a side-shifting single-fork adjustable forklift with self-locking function as described in Embodiment 1.

Claims

1. A hydraulic control system for a side-shift single-fork adjustable forklift with self-locking function, characterized in that, Includes an oil pump (1), a multi-way valve (3), a right fork offset cylinder (5), a left fork offset cylinder (6), a two-way hydraulic lock (9), and an oil tank (16); The oil pump (1) has its suction port connected to the oil tank (16), and the oil pump (1) has its outlet port connected to the inlet P of the multi-way valve (3). The bidirectional hydraulic lock (9) includes four working ports, namely the first working port V1, the second working port V2, the third working port C1 and the fourth working port C2. The first working port A1 of the multi-way valve (3) is connected to the rodless chamber of the right fork pitch cylinder (5), the second working port B1 of the multi-way valve (3) is connected to the first interface of the second three-way pipe (8), the second interface of the second three-way pipe (8) is connected to the rodless chamber of the left fork pitch cylinder (6), the third interface of the second three-way pipe (8) is connected to the fourth working port C2 of the bidirectional hydraulic lock (9), the third working port A2 of the multi-way valve (3) is connected to the first working port V1 of the bidirectional hydraulic lock (9), and the fourth working port B2 of the multi-way valve (3) is connected to the second working port V2 of the bidirectional hydraulic lock (9). The third working C1 of the bidirectional hydraulic lock (9) is connected to the first interface of the first three-way pipe (7), the second interface of the first three-way pipe (7) is connected to the rod chamber of the right fork offset cylinder (5), and the third interface of the first three-way pipe (7) is connected to the rod chamber of the left fork offset cylinder (6). When the first working port V1 of the bidirectional hydraulic lock (9) is supplied with pressure oil, the first working port V1 is connected to the third working port C1. Through the internal control oil circuit connected to the first working port V1 via the bidirectional hydraulic lock (9), the fourth working port C2 is connected to the second working port V2 in the opposite direction. When the second working port V2 of the bidirectional hydraulic lock (9) is supplied with pressure oil, the second working port V2 is connected to the fourth working port C2. Through the internal control oil circuit connected to the second working port V2 via the bidirectional hydraulic lock (9), the third working port C1 is connected to the first working port V1 in the opposite direction. Conversely, when pressure oil is supplied to the third working port C1 or the fourth working port C2 of the two-way hydraulic lock (9), the two-way hydraulic lock (9) is reversed and cut off, the third working port C1 is not connected to the first working port V1, and the fourth working port C2 is not connected to the second working port V2.

2. The hydraulic control system for a side-shifting single-fork adjustable forklift with self-locking function according to claim 1, characterized in that, The multi-way valve (3) includes a first attachment reversing valve plate (4) and a second attachment reversing valve plate (10). The first attachment reversing valve plate (4) is connected to a first working oil port A1 and a second working oil port B1. The second attachment reversing valve plate (10) is connected to a third working oil port A2 and a fourth working oil port B2. The oil inlet P of the multi-way valve (3) is divided into two paths through the internal oil circuit. One path is connected to the inlet of the safety valve (2). The outlet of the safety valve (2) is connected to the oil tank (16) through the annular return oil passage (15) of the multi-way valve (3) and the return oil port T of the multi-way valve (3). The other path is connected to the oil inlet of the first attachment reversing valve plate (4) and the second attachment reversing valve plate (10).

3. The hydraulic control system for a side-shifting single-fork adjustable forklift with self-locking function according to claim 2, characterized in that, The third working port A2 of the second accessory reversing valve plate (10) is connected to the inlet of the first overload replenishing valve (13) through the third three-way pipe (11). The outlet of the first overload replenishing valve (13) is connected to the annular return oil passage (15). The fourth working port B2 of the second accessory reversing valve plate (10) is connected to the inlet of the second overload replenishing valve (14) through the fourth three-way pipe (12). The outlet of the second overload replenishing valve (14) is connected to the annular return oil passage (15). The annular return oil passage (15) is connected to the return oil port T of the multi-way valve (3). The return oil port T is connected to the oil tank (16).

4. The hydraulic control system for a side-shifting single-fork adjustable forklift with self-locking function according to claim 2, characterized in that, When the first attachment reversing valve plate (4) and the second attachment reversing valve plate (10) are in the neutral position, the oil inlet P of the multi-way valve (3) is connected to the oil return port T of the multi-way valve (3) through the neutral oil passage of the first attachment reversing valve plate (4) and the second attachment reversing valve plate (10), and the oil return port T is connected to the oil tank (16).

5. The hydraulic control system for a side-shifting single-fork adjustable forklift with self-locking function according to claim 2, characterized in that, The first attachment reversing valve plate (4) and the second attachment reversing valve plate (10) are connected in parallel.

6. A forklift, characterized in that, The hydraulic control system for a side-shift single-fork adjustable forklift with self-locking function as described in any one of claims 1-5 is included.

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