Forklift Attachment Motion Control System

Abstract

This utility model relates to the field of forklift technology and discloses a forklift attachment motion control system. The T1 port of the side shift control valve is connected to the hydraulic oil tank; the A1 port of the side shift control valve is connected to the rodless chamber of the left fork cylinder; the B1 port of the side shift control valve is connected to the rodless chamber of the right fork cylinder; the P2 port of the pitch control valve is connected to the check valve; the T2 port of the pitch control valve is connected to the hydraulic oil tank; the A2 port of the pitch control valve is connected to the P3 port of the motion selection solenoid valve; the B2 port of the pitch control valve is connected to the rod chambers of both the left and right fork cylinders; the A3 port of the motion selection solenoid valve is connected to the rodless chamber of the left fork cylinder; and the B3 port of the pitch control valve is connected to the rodless chamber of the right fork cylinder. This utility model enables flexible control of the forklift, allowing forklift movements to be performed flexibly.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, and in particular to a forklift attachment motion control system. Background Technology

[0002] In actual forklift use, the working conditions are numerous and complex. The forklift's actions need to be flexible and adaptable to meet the needs of various working conditions. If the existing hydraulic system for forklift attachments is to achieve both double fork opening and closing and single fork distance adjustment at the same time, the pipeline layout is complex and cannot flexibly adapt to load changes. Therefore, there is an urgent need for a forklift attachment action control system that is simple to install and can adapt to complex working conditions. For this purpose, a forklift attachment action control system was designed. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art. Therefore, one objective of this utility model is to propose a forklift attachment motion control system, which enables flexible control of the forklift, allowing forklift movements to be performed flexibly.

[0004] The forklift attachment motion control system proposed in this utility model includes a hydraulic oil tank, a filter, a hydraulic pump, a check valve, a side shift control valve, a distance control valve, a motion selection solenoid valve, a right fork cylinder, a left fork cylinder, a controller, and an overflow valve.

[0005] The side-shift control valve has four ports: A1, B1, T1, and P1; the distance control valve has four ports: A2, B2, T2, and P2; the action selection solenoid valve has three ports: A3, B3, and P3; the side-shift control valve has a right-position solenoid U2 and a left-position solenoid U1; the distance control valve has a right-position solenoid V2 and a left-position solenoid V1; and the action selection solenoid valve has a right-position solenoid W2 and a left-position solenoid W1.

[0006] The control valve is used to adjust the distance between the right fork cylinder and the left fork cylinder. The controller collects the displacement signals of the left fork cylinder and the right fork cylinder.

[0007] The T1 port of the lateral shift control valve is connected to the hydraulic oil tank; the A1 port of the lateral shift control valve is connected to the rodless chamber of the left fork cylinder; the B1 port of the lateral shift control valve is connected to the rodless chamber of the right fork cylinder; the P2 port of the pitch control valve is connected to the check valve; the T2 port of the pitch control valve is connected to the hydraulic oil tank; the A2 port of the pitch control valve is connected to the P3 port of the action selection solenoid valve; the B2 port of the pitch control valve is connected to the rod chambers of both the left and right fork cylinders; the A3 port of the action selection solenoid valve is connected to the rodless chamber of the left fork cylinder; and the B3 port of the pitch control valve is connected to the rodless chamber of the right fork cylinder.

[0008] Preferably, the solenoid valve includes a valve core, a valve sleeve, an electromagnet, and a return spring, and the flow control of the two outlets of the solenoid valve is achieved by controlling the current of the electromagnets at both ends.

[0009] Preferably, one end of the hydraulic pump is connected to the hydraulic oil tank, and the other end is connected to the check valve, and the P1 port of the side shift control valve is connected to the check valve.

[0010] Preferably, the oil suction filter is fixed to the oil inlet of the hydraulic pump.

[0011] Preferably, the overflow valve is connected and fixed to the oil inlet circuit of the hydraulic pump.

[0012] Preferably, the action selection solenoid valve is a two-position three-way positive open valve.

[0013] Preferably, the left fork cylinder is equipped with a displacement sensor.

[0014] Preferably, the right fork cylinder is equipped with a displacement sensor.

[0015] The beneficial effects of this utility model are: it integrates the double fork opening and closing and single fork distance adjustment of the forklift into a set of hydraulic circuits, which simplifies the pipeline layout and allows the fork movements to adapt to load changes, thereby realizing flexible control of the forklift and enabling the forklift to move flexibly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the forklift attachment motion control system proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the action selection solenoid valve structure of the forklift attachment action control system proposed in this utility model.

[0018] Figure 3 This is a schematic diagram showing the non-energized position of the solenoid valve for the action selection of the forklift attachment action control system proposed in this utility model.

[0019] In the diagram: 1. Hydraulic oil tank; 2. Filter; 3. Hydraulic pump; 4. Check valve; 5. Side shift control valve; 6. Adjustment control valve; 7. Action selection solenoid valve; 7-1. Electromagnet; 7-2. Return spring; 7-3. Valve core; 7-4. Valve sleeve; 8. Right fork cylinder; 9. Left fork cylinder; 10. Controller; 11. Relief valve. Detailed Implementation

[0020] Reference Figure 1-3The forklift attachment motion control system includes a hydraulic oil tank 1, a filter 2, a hydraulic pump 3, a check valve 4, a side shift control valve 5, a distance control valve 6, an action selection solenoid valve 7, a right fork cylinder 8, a left fork cylinder 9, a controller 10, and an overflow valve 11.

[0021] The side-shift control valve 5 has four ports: A1, B1, T1, and P1; the pitch control valve 6 has four ports: A2, B2, T2, and P2; and the actuation selection solenoid valve 7 has three ports: A3, B3, and P3. The side-shift control valve 5 contains a right-position solenoid U2 and a left-position solenoid U1; the pitch control valve 6 contains a right-position solenoid V2 and a left-position solenoid V1; and the actuation selection solenoid valve 7 contains a right-position solenoid W2 and a left-position solenoid W1. (Reference) Figure 1 ;

[0022] The control valve 6 controls the right fork cylinder 8 and the left fork cylinder 9 to perform offset adjustment actions, and the controller 10 collects the displacement signals of the left fork cylinder 9 and the right fork cylinder 8.

[0023] The controller 10 can collect the displacement signals of the left fork cylinder 9 and the right fork cylinder 8, and then adjust the current of the electromagnets 7-1 at both ends of the action selection solenoid valve 7 to adjust the valve opening between the valve core 7-3 and the valve sleeve 7-4 of the action selection solenoid valve 7, thereby controlling the flow rate into the left fork cylinder 9 and the right fork cylinder 8 when performing the double fork opening and closing action, so as to realize the synchronous control of the left fork cylinder 9 and the right fork cylinder 8. When the electromagnets 7-1 at both ends are not energized, the valve core 7-3 returns to the neutral position under the action of the return spring 7-2.

[0024] The T1 port of the side shift control valve 5 is connected to the hydraulic oil tank 1. The A1 port of the side shift control valve 5 is connected to the rodless chamber of the left fork cylinder 9. The B1 port of the side shift control valve 5 is connected to the rodless chamber of the right fork cylinder 8. The P2 port of the pitch control valve 6 is connected to the check valve 4. The T2 port of the pitch control valve 6 is connected to the hydraulic oil tank 1. The A2 port of the pitch control valve 6 is connected to the P3 port of the action selection solenoid valve 7. The B2 port of the pitch control valve 6 is connected to the rod chambers of the left fork cylinder 9 and the right fork cylinder 8. The A3 port of the action selection solenoid valve 7 is connected to the rodless chamber of the left fork cylinder 9. The B3 port of the pitch control valve 6 is connected to the rodless chamber of the right fork cylinder 8.

[0025] The action selection solenoid valve 7 includes a valve core 7-3, a valve sleeve 7-4, an electromagnet 7-1, and a return spring 7-2. The flow control of the two outlets of the action selection solenoid valve 7 is achieved by controlling the current of the electromagnets 7-1 at both ends.

[0026] One end of the hydraulic pump 3 is connected to the hydraulic oil tank 1, and the other end is connected to the check valve 4. The P1 port of the side shift control valve 5 is connected to the check valve 4.

[0027] The suction filter 2 is fixed at the oil inlet of the hydraulic pump 3.

[0028] The overflow valve 11 is connected and fixed to the oil inlet circuit of the hydraulic pump 3.

[0029] The solenoid valve 7 is a two-position three-way positive open valve.

[0030] The left fork cylinder 9 is equipped with a displacement sensor, and the right fork cylinder 8 is equipped with a displacement sensor.

[0031] When this device is in use, hydraulic oil enters the hydraulic pump 3 from the hydraulic oil tank 1 through the filter 2, and then the hydraulic pump 3 supplies oil to the working circuit through the check valve 4. When the side shift control valve 5 and the pitch control valve 6 are both in the neutral position and do not operate, the oil flows back to the hydraulic oil tank 1 through the overflow valve 11.

[0032] When the left position U1 of the side shift control valve 5 is energized, the W1 of the action selection control valve 7 is also energized. The P1 port of the side shift control valve 5 is connected to the A1 port of the side shift control valve 5, and the T1 port of the side shift control valve 5 is connected to the B1 port of the side shift control valve 5. The oil enters the side shift control valve 5 from the outlet of the check valve 4, and enters the rodless chamber of the left fork cylinder 9 through the A1 port of the side shift control valve 5. The left fork cylinder 9 is connected to the rod chamber of the right fork cylinder 8 and is also connected to the B2 port of the pitch control valve 6. The oil in the rodless chamber of the right fork cylinder 8 flows back to the hydraulic oil tank 1 through the side shift control valve 5, and the forks move to the right.

[0033] When the right position U2 of the side shift control valve 5 is energized, the W2 of the action selection control valve 7 is also energized. The P1 port of the side shift control valve 5 is connected to the B1 port of the side shift control valve 5, and the T1 port of the side shift control valve 5 is connected to the A1 port of the side shift control valve 5. The oil enters the side shift control valve 5 from the outlet of the check valve 4, and enters the rodless chamber of the right fork cylinder 8 through the A1 port of the side shift control valve 5. The left fork cylinder 9 is connected to the rod chamber of the right fork cylinder 8 and is also connected to the B2 port of the pitch control valve 6. The oil in the rodless chamber of the left fork cylinder 9 flows back to the hydraulic oil tank 1 through the side shift control valve 5, and the forks move to the left.

[0034] When the left position V1 of the pitch control valve 6 is energized, port P2 of the pitch control valve 6 is connected to port A2, and port T2 of the pitch control valve 6 is connected to port B2. Oil enters the pitch control valve 6 from the outlet of check valve 4, and then enters port P3 of the actuation selection solenoid valve 7 via port A2. Figure 3 As shown, when the action selection solenoid valve 7 is not energized, the action selection solenoid valve 7 is in the neutral position, the valve core 7-3 is in the middle position, and the P3 of the action selection solenoid valve 7 is connected to the A3 and B3 of the action selection solenoid valve 7. The oil can enter the rodless chamber of the left fork cylinder 9 and the right fork cylinder 8 from the P3 of the action selection solenoid valve 7 respectively. At the same time, the oil of the left fork cylinder 9 and the right fork cylinder 8 returns to the hydraulic oil tank 1 through the B2 port of the pitch control valve 6, so as to realize the double fork merging action of the forks.

[0035] When the right-hand V2 of the pitch control valve 6 is energized, the P2 port of the pitch control valve 6 is connected to the B2 port, and the T2 port is connected to the A2 port. Oil enters the pitch control valve 6 from the outlet of the check valve 4, and then enters the rod-side chambers of the left fork cylinder 9 and the right fork cylinder 8 via the B2 port. Figure 3 As shown, when the action selection solenoid valve 7 is not energized, the action selection solenoid valve 7 is in the neutral position, the valve core 7-3 is in the middle position, and the P3 of the action selection solenoid valve 7 is connected to the A3 and B3 of the action selection solenoid valve 7. The oil in the rodless chamber of the left fork cylinder 9 and the right fork cylinder 8 can enter the action selection solenoid valve 7 from the A3 and B3 of the action selection solenoid valve 7 respectively, and return to the hydraulic oil tank 1 through the A2 port of the pitch control valve 6, so as to realize the double fork opening action of the forks.

[0036] When the left position V1 of the pitch control valve 6 is energized, the P2 port of the pitch control valve 6 is connected to the A2 port of the pitch control valve 6, and the T2 port of the pitch control valve 6 is connected to the B2 port of the pitch control valve 6. The oil enters the pitch control valve 6 from the outlet of the check valve 4, and enters the P3 port of the action selection solenoid valve 7 through the A2 port of the pitch control valve 6. When the W1 of the action selection solenoid valve 7 is energized, the action selection solenoid valve 7 is in the left position, the valve core 7-3 moves to the right, and the P3 port of the action selection solenoid valve 7 is connected to the A3 port of the action selection solenoid valve 7. The oil can enter the rodless chamber of the left fork cylinder 9 from the P3 port of the action selection solenoid valve 7. At the same time, the oil in the rod chamber of the left fork cylinder 9 returns to the hydraulic oil tank 1 through the B2 port of the pitch control valve 6, so that the fork can move to the right independently.

[0037] In this implementation scheme, the left position V2 of the pitch control valve 6 is energized, the P2 port of the pitch control valve 6 is connected to the B2 port of the pitch control valve 6, and the T2 port of the pitch control valve 6 is connected to the A2 port of the pitch control valve 6. The oil enters the pitch control valve 6 from the outlet of the check valve 4, and enters the rod chamber of the left fork cylinder 9 through the B2 port of the pitch control valve 6. When the W1 of the action selection solenoid valve 7 is energized, the action selection solenoid valve 7 is in the left position, the valve core 7-3 moves to the right, and the P3 of the action selection solenoid valve 7 is connected to the A3 of the action selection solenoid valve 7. The oil in the rodless chamber of the left fork cylinder 9 can enter the action selection solenoid valve 7 from the A3 port of the action selection solenoid valve 7, and return to the hydraulic oil tank 1 through the A2 port of the pitch control valve 6, so as to realize that the fork can move the left fork independently to the left.

[0038] When the left position V1 of the pitch control valve 6 is energized, the P2 port of the pitch control valve 6 is connected to the A2 port of the pitch control valve 6, and the T2 port of the pitch control valve 6 is connected to the B2 port of the pitch control valve 6. The oil enters the pitch control valve 6 from the outlet of the check valve 4, and enters the P3 port of the action selection solenoid valve 7 through the A2 port of the pitch control valve 6. When the W2 of the action selection solenoid valve 7 is energized, the action selection solenoid valve 7 is in the right position, the valve core 7-3 moves to the left, and the P3 port of the action selection solenoid valve 7 is connected to the B3 port of the action selection solenoid valve 7. The oil can enter the rodless chamber of the right fork cylinder 8 from the P3 port of the action selection solenoid valve 7. At the same time, the oil in the rod chamber of the right fork cylinder 8 returns to the hydraulic oil tank 1 through the B2 port of the pitch control valve 6, so that the fork can move to the left independently on the right fork.

[0039] When the left-side V2 of the pitch control valve 6 is energized, the P2 port of the pitch control valve 6 is connected to the B2 port of the pitch control valve 6, and the T2 port of the pitch control valve 6 is connected to the A2 port of the pitch control valve 6. The oil enters the pitch control valve 6 from the outlet of the check valve 4, and enters the rod chamber of the right fork cylinder 8 through the B2 port of the pitch control valve 6. When the W2 of the action selection solenoid valve 7 is energized, the action selection solenoid valve 7 is in the right position, and the valve core 7-3 moves to the left. The P3 of the action selection solenoid valve 7 is connected to the B3 of the action selection solenoid valve 7. The oil in the rodless chamber of the right fork cylinder 8 can enter the action selection solenoid valve 7 from the A3 port of the action selection solenoid valve 7, and return to the hydraulic oil tank 1 through the A2 port of the pitch control valve 6, so that the fork can move to the right independently.

Claims

1. A forklift attachment motion control system, characterized in that: Includes hydraulic oil tank, filter, hydraulic pump, check valve, side shift control valve, pitch control valve, action selection solenoid valve, right fork cylinder, left fork cylinder, controller, and relief valve; The side-shift control valve has four ports: A1, B1, T1, and P1; the distance control valve has four ports: A2, B2, T2, and P2; the action selection solenoid valve has three ports: A3, B3, and P3; the side-shift control valve has a right-position solenoid U2 and a left-position solenoid U1; the distance control valve has a right-position solenoid V2 and a left-position solenoid V1; and the action selection solenoid valve has a right-position solenoid W2 and a left-position solenoid W1. The control valve is used to adjust the distance between the right fork cylinder and the left fork cylinder. The controller collects the displacement signals of the left fork cylinder and the right fork cylinder. The T1 port of the lateral shift control valve is connected to the hydraulic oil tank; the A1 port of the lateral shift control valve is connected to the rodless chamber of the left fork cylinder; the B1 port of the lateral shift control valve is connected to the rodless chamber of the right fork cylinder; the P2 port of the pitch control valve is connected to the check valve; the T2 port of the pitch control valve is connected to the hydraulic oil tank; the A2 port of the pitch control valve is connected to the P3 port of the action selection solenoid valve; the B2 port of the pitch control valve is connected to the rod chambers of both the left and right fork cylinders; the A3 port of the action selection solenoid valve is connected to the rodless chamber of the left fork cylinder; and the B3 port of the pitch control valve is connected to the rodless chamber of the right fork cylinder.

2. The forklift implement action control system of claim 1, wherein: The solenoid valve includes a valve core, a valve sleeve, an electromagnet, and a return spring. Controlling the current of the electromagnets at both ends enables flow control of the two outlets of the solenoid valve.

3. The forklift implement action control system of claim 1, wherein: One end of the hydraulic pump is connected to the hydraulic oil tank, and the other end is connected to the check valve. The P1 port of the side shift control valve is connected to the check valve.

4. The forklift implement action control system of claim 1, wherein: The suction filter is fixed to the oil inlet of the hydraulic pump.

5. The forklift implement action control system of claim 1, wherein: The overflow valve is connected and fixed to the oil inlet circuit of the hydraulic pump.

6. The forklift implement action control system of claim 1, wherein: The solenoid valve for selecting the action is a two-position three-way positive open valve.

7. The forklift implement action control system of claim 1, wherein: The left fork cylinder is equipped with a displacement sensor.

8. The forklift attachment motion control system according to claim 1, characterized in that: The right fork cylinder is equipped with a displacement sensor.

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