Pallet fork moving hydraulic system for electric forklift and electric forklift

Abstract

The utility model relates to the field of electric forklifts, and discloses a pallet fork moving hydraulic system for an electric forklift and the electric forklift. The hydraulic system comprises a first main valve, a second electromagnetic valve set, a left moving oil cylinder and a right moving oil cylinder, the first main valve is in pipeline connection with an external hydraulic oil tank, the P2 end is in pipeline connection with the A1 end, the T2 end can be in pipeline connection with the hydraulic oil tank, a rodless cavity pipeline of the left moving oil cylinder is connected with the A21 end, and a rod cavity pipeline of the left moving oil cylinder is connected with the B21 end. A rodless cavity pipeline of the right side moving oil cylinder is connected with the A22 end, and a rod cavity pipeline of the right side moving oil cylinder is connected with the B22 end. According to the hydraulic system, operation of multiple modes such as left-right movement of a single pallet fork, opening and closing of the pallet forks and the like is achieved only through one multi-way valve, cost is reduced, complexity of the hydraulic system is greatly reduced, and stability and reliability of operation of the hydraulic system are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of electric forklifts, in particular to a cargo fork moving hydraulic system for an electric forklift and an electric forklift. Background Art

[0002] Forklifts are industrial handling vehicles, which refer to various wheeled handling vehicles for loading, unloading, stacking and short-distance transportation of palletized goods. Forklifts are widely used in ports, stations, airports, cargo yards and other places, and are indispensable equipment for pallet transportation and container transportation. The movement of the forklift's fork is controlled by the hydraulic system. And the movement of the fork controls how the forklift can achieve loading and unloading. In order to respond to the national policy of clean energy, major manufacturers have launched electric forklifts one after another. At present, the hydraulic system for moving the fork of the forklift has the following problems: first, at least two multi-way valves are required for the operation of the hydraulic system; second, when the hydraulic system operates the fork to move, it can usually only choose the mode of "left and right forks move left and right at the same time + left fork moves left and right + right fork moves left and right" or "left and right forks move left and right at the same time + left and right forks open and close at the same time + single fork moves left and right"; the operation mode is single. And if you want to realize the mode of "left and right forks move left and right at the same time + left fork moves left and right + right fork moves left and right + left and right forks open and close at the same time", you need to increase the number of multi-way valves, which will make the structure of the hydraulic system complicated and increase the cost. Utility Model Content

[0003] In order to overcome the above-mentioned problems, the utility model provides a fork moving hydraulic system for an electric forklift and a forklift. The hydraulic system realizes all modes of operation of the fork by adopting only one multi-way valve, and can realize the consistent opening and closing speed of the two forks of the fork, thereby reducing the cost, greatly reducing the complexity of the hydraulic system, and ensuring the stability and reliability of the operation of the hydraulic system.

[0004] In order to achieve the above-mentioned object, the utility model provides a hydraulic system for moving a fork of an electric forklift, the hydraulic system comprising:

[0005] A first main valve, wherein a pipeline of the first main valve is connected to an external hydraulic oil tank;

[0006] A second solenoid valve group, wherein a pipeline at a P2 end of the second solenoid valve group is connected to an A1 end of the first main valve, and a pipeline at a T2 end of the second solenoid valve group is connected to the hydraulic oil tank;

[0007] A left-side movable oil cylinder, wherein the rodless cavity pipeline of the left-side movable oil cylinder is connected to the A21 end of the second solenoid valve group, and the rod cavity pipeline of the left-side movable oil cylinder is connected to the B21 end of the second solenoid valve group;

[0008] The right side movable cylinder, the rodless cavity pipeline of the right side movable cylinder is connected to the A22 end of the second solenoid valve group, and the rod cavity pipeline of the right side movable cylinder is connected to the B22 end of the second solenoid valve group.

[0009] Preferably, the hydraulic system further comprises:

[0010] A third solenoid valve, wherein the pipeline at the P3 end of the third solenoid valve is connected to the B2 end of the first main valve, the pipeline at the T3 end of the third solenoid valve is connected to the hydraulic oil tank, the pipeline at the A3 end of the third solenoid valve is connected to the pipeline between the A21 end of the second solenoid valve group and the rodless chamber of the left movable cylinder, and the pipeline at the B3 end of the third solenoid valve is connected to the pipeline between the A22 end of the second solenoid valve group and the rodless chamber of the right movable cylinder;

[0011] The fourth solenoid valve, the B4 end pipeline of the fourth solenoid valve connects the pipeline between the B21 end of the second solenoid valve group and the rod chamber of the left movable cylinder, and the A4 end pipeline of the fourth solenoid valve connects the pipeline between the B22 end of the second solenoid valve group and the rod chamber of the right movable cylinder.

[0012] Preferably, the second solenoid valve group includes:

[0013] A first throttle valve, one end of which is connected to the P2 end of the second solenoid valve group through a pipeline;

[0014] A second throttle valve, one end of the second throttle valve is connected to the P2 end of the second solenoid valve group through a pipeline.

[0015] Preferably, the second solenoid valve group further includes:

[0016] The first three-position four-way solenoid valve, the P21 end pipeline of the first three-position four-way solenoid valve is connected to the other end of the first throttle valve, the A211 end pipeline of the first three-position four-way solenoid valve is connected to the A21 end of the second solenoid valve group, the B211 end pipeline of the first three-position four-way solenoid valve is connected to the B21 end of the second solenoid valve group, and the T21 end pipeline of the first three-position four-way solenoid valve is connected to the T2 end of the second solenoid valve group.

[0017] Preferably, the second solenoid valve group further includes:

[0018] The second three-position four-way solenoid valve, the P22 end pipeline of the second three-position four-way solenoid valve is connected to the other end of the second throttle valve, the A222 end pipeline of the second three-position four-way solenoid valve is connected to the A22 end of the second solenoid valve group, the B222 end pipeline of the second three-position four-way solenoid valve is connected to the B22 end of the second solenoid valve group, and the T22 end pipeline of the second three-position four-way solenoid valve is connected to the T2 end of the second solenoid valve group.

[0019] Preferably, the hydraulic system further includes a controller, and the controller is electrically connected to the first main valve, the second solenoid valve group, the fourth solenoid valve and the third solenoid valve.

[0020] Preferably, the third solenoid valve is a three-position four-way solenoid valve;

[0021] The fourth solenoid valve is a two-position, two-way solenoid valve.

[0022] Preferably, the hydraulic system further comprises:

[0023] A left fork connected to the right moving cylinder;

[0024] The right side cargo fork is connected to the left side moving cylinder.

[0025] A second aspect of the utility model provides an electric forklift, comprising a forklift body and a hydraulic system as claimed in any one of the above claims.

[0026] Through the above technical scheme, the hydraulic system realizes all modes of operation of the fork by setting a first main valve as a multi-way valve, and sets the first main valve, the second solenoid valve group and the left and right moving cylinders to realize the left and right movement of the left and right forks and the opening and closing of the forks; and sets a throttle valve to adjust the amount of pressure oil to control the opening and closing speed of the two forks of the fork to be consistent; sets the third solenoid valve and the fourth solenoid valve to cooperate to realize the left and right movement of the fork as a whole; the hydraulic system reduces the cost, greatly reduces the complexity of the hydraulic system, and ensures the stability and reliability of the operation of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a schematic diagram of the pipeline connection of a hydraulic system for moving a fork of an electric forklift according to an embodiment of the present invention.

[0028] Description of Reference Numerals

[0029] 1. First main valve 2. Second solenoid valve group

[0030] 3. The third solenoid valve 4. The fourth solenoid valve

[0031] 5. Left side moving cylinder 6. Right side moving cylinder

[0032] 21. First throttle valve 22. Second throttle valve

[0033] 23. First three-position four-way solenoid valve 24. Second three-position four-way solenoid valve

[0034] A1, A1 end of the first main valve B1, B1 end of the first main valve

[0035] P2, P2 end of the second solenoid valve group T2, T2 end of the second solenoid valve group

[0036] A21, A21 end of the second solenoid valve group B21, B21 end of the second solenoid valve group

[0037] A22, A22 end of the second solenoid valve group B22, B22 end of the second solenoid valve group

[0038] P3, P3 end of the third solenoid valve T3, T3 end of the third solenoid valve

[0039] A3, A3 end of the third solenoid valve B3, B3 end of the third solenoid valve

[0040] A4, A3 end of the fourth solenoid valve B4, B4 end of the fourth solenoid valve

[0041] P21, the P21 terminal of the first three-position four-way solenoid valve T21, the T21 terminal of the first three-position four-way solenoid valve

[0042] A211, A211 end of the first three-position four-way solenoid valve B211, B211 end of the first three-position four-way solenoid valve

[0043] P22, the P22 end of the second three-position four-way solenoid valve T22, the T22 end of the second three-position four-way solenoid valve

[0044] A222, A222 end of the second three-position four-way solenoid valve B222, B222 end of the second three-position four-way solenoid valve DETAILED DESCRIPTION

[0045] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0046] like Figure 1 The figure shows a schematic diagram of the pipeline connection of a hydraulic system for moving a forklift for an electric forklift according to an embodiment of the utility model. Figure 1In the embodiment, the hydraulic system includes a first main valve 1, a second solenoid valve group 2, a left-side moving cylinder 5 and a right-side moving cylinder 6. Specifically, the first main valve 1 is connected to an external hydraulic oil tank by a pipeline, the P2 end of the second solenoid valve group 2 can be connected to the A1 end of the first main valve 1 by a pipeline, the T2 end of the second solenoid valve group 2 can be connected to the hydraulic oil tank by a pipeline, the rodless chamber of the left-side moving cylinder 5 can be connected to the A21 end of the second solenoid valve group 2 by a pipeline, the rod chamber of the left-side moving cylinder 5 can be connected to the B21 end of the second solenoid valve group 2 by a pipeline, the rodless chamber of the right-side moving cylinder 6 can be connected to the A22 end of the second solenoid valve group 2 by a pipeline, and the rod chamber of the right-side moving cylinder 6 can be connected to the B22 end of the second solenoid valve group 2 by a pipeline.

[0047] The above hydraulic system can realize various movement modes of the fork, such as:

[0048] The left fork moves left: the controller can control the A1 end, P2 end, and A22 end to open at the same time. At this time, the P22 end of the second three-position four-way solenoid valve 24 is connected to the A222 end, and the T22 end is connected to the B222 end. The pressure oil enters the P2 end from the A1 end, and then enters the rodless cavity of the right mobile cylinder 6 from the A22 end, pushing the piston rod to move to the left. At the same time, the pressure oil in the rod cavity of the right mobile cylinder 6 returns to the hydraulic oil tank through the B22 end and the T2 end, realizing the left movement of the left fork.

[0049] The left fork moves to the right: the controller can control the A1 end, P2 end, and B22 end to open at the same time. At this time, the P22 end of the second three-position four-way solenoid valve 24 is connected to the B222 end, and the T22 end is connected to the A222 end. The pressure oil enters the P2 end from the A1 end, and then enters the rod cavity of the right mobile cylinder 6 from the B22 end, pushing the piston rod to move to the right. At the same time, the pressure oil in the rodless cavity of the right mobile cylinder 6 returns to the hydraulic oil tank through the A22 end and the T2 end, realizing the right movement of the left fork.

[0050] The right fork moves left: the controller can control the A1 end, P2 end, and B21 end to open at the same time. At this time, the P21 end of the first three-position four-way solenoid valve 23 is connected to the B211 end, and the T21 end is connected to the A211 end. The pressure oil enters the P2 end from the A1 end, and then enters the rod cavity of the left mobile cylinder 5 from the B21 end, pushing the piston rod to move left. At the same time, the pressure oil in the rodless cavity of the left mobile cylinder 5 returns to the hydraulic oil tank through the A21 end and the T2 end, realizing the left movement of the right fork.

[0051] The right fork moves to the right: the controller can control the A1 end, P2 end, and A21 end to open at the same time. At this time, the P21 end of the first three-position four-way solenoid valve 23 is connected to the A211 end, and the T21 end is connected to the B211 end. The pressure oil enters the P2 end from the A1 end, and then enters the rodless cavity of the left mobile cylinder 5 from the A21 end, pushing the piston rod to move to the right. At the same time, the pressure oil in the rod cavity of the left mobile cylinder 5 returns to the hydraulic oil tank through the B21 end and the T2 end, realizing the right movement of the right fork.

[0052] Opening of forks on both sides: The controller can control A1, P2, B21 and B22 to open at the same time. At this time, P22 of the second three-position four-way solenoid valve 24 is connected to B222, T22 is connected to A222, P21 of the first three-position four-way solenoid valve 21 is connected to B211, T21 is connected to A211, and pressure oil enters P2 from A1, and then enters the rod chambers of the left moving cylinder 5 and the right moving cylinder 6 from B21 and B22 at the same time, pushing the two piston rods to move outward. At the same time, the pressure oil in the rodless chambers of the left moving cylinder 5 and the right moving cylinder 6 returns to the hydraulic tank through A21 and A22 respectively, realizing the opening of the forks.

[0053] The forks on both sides are brought together: the controller can control the A1 end and the P2 end, the A21 end, and the A22 end to open at the same time. At this time, the P22 end of the second three-position four-way solenoid valve 24 is connected to the A222 end, the T22 end is connected to the B222 end, the P21 end of the first three-position four-way solenoid valve 23 is connected to the A211 end, and the T21 end is connected to the B211 end. The pressure oil enters the P2 end from the A1 end, and then enters the rod chambers of the left moving cylinder 5 and the right moving cylinder 6 from the A21 end and the A22 end at the same time, pushing the two piston rods to move outward. At the same time, the pressure oil in the rodless chambers of the left moving cylinder 5 and the right moving cylinder 6 returns to the hydraulic oil tank through the B21 end and the B22 end respectively, realizing the opening of the forks.

[0054] The hydraulic system uses only one multi-way valve to realize the left and right movement of a single fork of the fork, the opening and closing of the forks in multiple modes of operation, which reduces the cost, greatly reduces the complexity of the hydraulic system, and ensures the stability and reliability of the hydraulic system operation.

[0055] exist Figure 1In order to realize the overall movement mode of the fork, in one embodiment of the utility model, the hydraulic system also includes a third solenoid valve 3 and a fourth solenoid valve 4; the P3 end pipeline of the third solenoid valve 3 is connected to the B2 end of the first main valve 1, the T3 end pipeline of the third solenoid valve 3 is connected to the hydraulic oil tank, the A3 end pipeline of the third solenoid valve 3 is connected to the pipeline between the A21 end of the second solenoid valve group 2 and the rodless cavity of the left moving cylinder 5, and the B3 end pipeline of the third solenoid valve 3 is connected to the pipeline between the A22 end of the second solenoid valve group 2 and the rodless cavity of the right moving cylinder 6; the B4 end pipeline of the fourth solenoid valve 4 is connected to the pipeline between the B21 end of the second solenoid valve group 2 and the rod cavity of the left moving cylinder 5, and the A4 end pipeline of the fourth solenoid valve 4 is connected to the pipeline between the B22 end of the second solenoid valve group 2 and the rod cavity of the right moving cylinder 6.

[0056] The above hydraulic system can realize the overall movement mode of the fork, such as:

[0057] The fork moves left as a whole: the controller can control the A1 end, P3 end, A3 end and the fourth solenoid valve 4 to open at the same time. At this time, the pressure oil enters the P3 end from the A1 end, and then enters the rodless cavity of the right mobile cylinder 6 from the A3 end, pushing the piston rod of the right mobile cylinder 6 to move left. At the same time, because the rod cavity of the left mobile cylinder 5 is connected with the rod cavity of the right mobile cylinder 6, the pressure oil in the rod cavity of the right mobile cylinder 6 enters the rod cavity of the left mobile cylinder 5 through the fourth solenoid valve 4, pushing the piston rod of the left mobile cylinder 5 to move left, and the pressure oil in the rodless cavity of the left mobile cylinder 5 returns to the hydraulic oil tank through the B3 end and the T3 end, realizing the overall left movement of the fork.

[0058] The fork moves right as a whole: the controller can control the A1 end, P3 end, B3 end and the fourth solenoid valve 4 to open at the same time. At this time, the pressure oil enters the P3 end from the A1 end, and then enters the rodless cavity of the left movable cylinder 5 from the B3 end, pushing the piston rod of the left movable cylinder 5 to move right. At the same time, because the rod cavity of the left movable cylinder 5 is connected with the rod cavity of the right movable cylinder 6, the pressure oil in the rod cavity of the left movable cylinder 5 enters the rod cavity of the right movable cylinder 6 through the fourth solenoid valve 4, pushing the piston rod of the right movable cylinder 6 to move right. The pressure oil in the rodless cavity of the right movable cylinder 6 returns to the hydraulic oil tank through the A3 end and the T3 end, realizing the overall rightward movement of the fork.

[0059] exist Figure 1 In order to adjust the opening and closing speed of the fork and ensure the opening and closing consistency of the left fork and the right fork, in one embodiment of the utility model, the second solenoid valve group 2 includes a first throttle valve 21 and a second throttle valve 22, one end of the first throttle valve 21 can be connected to the P2 end of the second solenoid valve group 2 by a pipeline, and one end of the second throttle valve 22 can be connected to the P2 end of the second solenoid valve group 2 by a pipeline.

[0060] exist Figure 1 In order to facilitate the adjustment of the movement of the right fork, in one embodiment of the utility model, the second solenoid valve group 2 also includes a first three-position four-way solenoid valve 23, the P21 end of the first three-position four-way solenoid valve 23 can be connected to the other end of the first throttle valve 21 by a pipeline, the A211 end of the first three-position four-way solenoid valve 23 is connected to the A21 end of the second solenoid valve group 2 by a pipeline, the B211 end of the first three-position four-way solenoid valve 23 can be connected to the B21 end of the second solenoid valve group 2 by a pipeline, and the T21 end of the first three-position four-way solenoid valve 23 is connected to the T2 end of the second solenoid valve group 2 by a pipeline.

[0061] exist Figure 1 In order to facilitate the adjustment of the movement of the left fork, in one embodiment of the utility model, the second solenoid valve group also includes a second three-position four-way solenoid valve 24, the P22 end of the second three-position four-way solenoid valve 24 can be connected to the other end of the second throttle valve 22 by a pipeline, the A222 end of the second three-position four-way solenoid valve 24 is connected to the A22 end of the second solenoid valve group 2 by a pipeline, the B222 end of the second three-position four-way solenoid valve 24 is connected to the B22 end of the second solenoid valve group 2 by a pipeline, and the T22 end of the second three-position four-way solenoid valve 24 can be connected to the T2 end of the second solenoid valve group 2 by a pipeline.

[0062] Taking into account the opening control of various valves in the hydraulic system, in one embodiment of the utility model, the hydraulic system also includes a controller, which is electrically connected to the first main valve 1, the second solenoid valve group 2, the fourth solenoid valve 4 and the third solenoid valve 3, so as to realize real-time adjustment of various valves and complete the fork adjustment of the corresponding mode.

[0063] In order to facilitate the overall movement and adjustment of the fork, in one embodiment of the utility model, the types of the third solenoid valve 3 and the fourth solenoid valve 4 can be various types known to those skilled in the art, the third solenoid valve 4 can be a three-position four-way solenoid valve, and the fourth solenoid valve 4 can be a two-position two-way solenoid valve.

[0064] In order to meet the control requirements of the hydraulic system on the fork, in one embodiment of the utility model, the hydraulic system includes a left fork and a right fork. Considering the installation relationship of the forks on both sides when the hydraulic system completes the fork adjustment, the left fork can be connected to the right moving cylinder 6; the right fork can be connected to the left moving cylinder 5.

[0065] Another aspect of the utility model provides an electric forklift, which comprises a forklift body and a hydraulic system as claimed in any one of the above claims.

[0066] Through the above technical scheme, the hydraulic system realizes all modes of operation of the fork by setting a first main valve as a multi-way valve, and sets the first main valve, the second solenoid valve group and the left and right moving cylinders to realize the left and right movement of the left and right forks and the opening and closing of the forks; and sets a throttle valve to adjust the amount of pressure oil to control the opening and closing speed of the two forks of the fork to be consistent; sets the third solenoid valve and the fourth solenoid valve to cooperate to realize the left and right movement of the fork as a whole; the hydraulic system reduces the cost, greatly reduces the complexity of the hydraulic system, and ensures the stability and reliability of the operation of the hydraulic system.

[0067] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0068] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A hydraulic system for moving forks for electric forklifts, characterized in that: The hydraulic system comprises: A first main valve, wherein a pipeline of the first main valve is connected to an external hydraulic oil tank; A second solenoid valve group, wherein a pipeline at a P2 end of the second solenoid valve group is connected to an A1 end of the first main valve, and a pipeline at a T2 end of the second solenoid valve group is connected to the hydraulic oil tank; A left-side movable oil cylinder, wherein the rodless cavity pipeline of the left-side movable oil cylinder is connected to the A21 end of the second solenoid valve group, and the rod cavity pipeline of the left-side movable oil cylinder is connected to the B21 end of the second solenoid valve group; The right side movable cylinder, the rodless cavity pipeline of the right side movable cylinder is connected to the A22 end of the second solenoid valve group, and the rod cavity pipeline of the right side movable cylinder is connected to the B22 end of the second solenoid valve group.

2. The hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises: A third solenoid valve, wherein the pipeline at the P3 end of the third solenoid valve is connected to the B2 end of the first main valve, the pipeline at the T3 end of the third solenoid valve is connected to the hydraulic oil tank, the pipeline at the A3 end of the third solenoid valve is connected to the pipeline between the A21 end of the second solenoid valve group and the rodless chamber of the left movable cylinder, and the pipeline at the B3 end of the third solenoid valve is connected to the pipeline between the A22 end of the second solenoid valve group and the rodless chamber of the right movable cylinder; The fourth solenoid valve, the B4 end pipeline of the fourth solenoid valve connects the pipeline between the B21 end of the second solenoid valve group and the rod chamber of the left movable cylinder, and the A4 end pipeline of the fourth solenoid valve connects the pipeline between the B22 end of the second solenoid valve group and the rod chamber of the right movable cylinder.

3. The hydraulic system according to claim 1, characterized in that: The second solenoid valve group includes: A first throttle valve, one end of which is connected to the P2 end of the second solenoid valve group through a pipeline; A second throttle valve, one end of the second throttle valve is connected to the P2 end of the second solenoid valve group through a pipeline.

4. The hydraulic system according to claim 3, characterized in that: The second solenoid valve group further includes: The first three-position four-way solenoid valve, the P21 end pipeline of the first three-position four-way solenoid valve is connected to the other end of the first throttle valve, the A211 end pipeline of the first three-position four-way solenoid valve is connected to the A21 end of the second solenoid valve group, the B211 end pipeline of the first three-position four-way solenoid valve is connected to the B21 end of the second solenoid valve group, and the T21 end pipeline of the first three-position four-way solenoid valve is connected to the T2 end of the second solenoid valve group.

5. The hydraulic system according to claim 3, characterized in that: The second solenoid valve group further includes: The second three-position four-way solenoid valve, the P22 end pipeline of the second three-position four-way solenoid valve is connected to the other end of the second throttle valve, the A222 end pipeline of the second three-position four-way solenoid valve is connected to the A22 end of the second solenoid valve group, the B222 end pipeline of the second three-position four-way solenoid valve is connected to the B22 end of the second solenoid valve group, and the T22 end pipeline of the second three-position four-way solenoid valve is connected to the T2 end of the second solenoid valve group.

6. The hydraulic system according to claim 2, characterized in that: The hydraulic system further includes a controller, which is electrically connected to the first main valve, the second solenoid valve group, the fourth solenoid valve and the third solenoid valve.

7. The hydraulic system according to claim 6, characterized in that: The third solenoid valve is a three-position four-way solenoid valve; The fourth solenoid valve is a two-position, two-way solenoid valve.

8. The hydraulic system according to claim 1, characterized in that: The hydraulic system further comprises: A left side fork connected to the right side moving cylinder; The right side cargo fork is connected to the left side moving cylinder.

9. An electric forklift, characterized in that: The electric forklift comprises a forklift body and a hydraulic system as claimed in any one of claims 1 to 8.

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