Hydraulic valve group of full-hydraulic steering gear

Abstract

The invention provides a hydraulic valve bank of a full-hydraulic steering gear, which belongs to the technical field of hydraulic valve banks and comprises a valve body, a valve sleeve and a valve core, four oil ports, namely an oil port T, an oil port P, an oil port A and an oil port EF, are formed in one side of the valve body, an oil port B is formed in the other side of the valve body, the oil port T and the oil port P are used for communicating with a hydraulic pump station, and the oil port A and the oil port B are used for communicating with a steering oil cylinder of an electric forklift. The EF oil port is used for being communicated with a multi-way valve of the inserting arm lifting oil cylinder, and then the steering oil cylinder of the electric forklift is controlled to provide the pressure of the remaining hydraulic oil for the inserting arm lifting oil cylinder when working. The hydraulic valve bank of the full-hydraulic steering gear has the technical effects that one power unit can be used for steering of an electric forklift and lifting operation of an insertion arm, hydraulic oil can be reutilized, and energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic valve groups, and more specifically, relates to a hydraulic valve group of a full hydraulic steering gear. Background Art

[0002] Electric forklifts, low-speed machines, engineering vehicles, etc. often use hydraulic valve groups to achieve direction control and pressure control of machine operation. Especially in traditional electric forklifts, hydraulic valves mainly control steering and arm lifting. Steering is controlled by steering cylinders, and arm lifting is controlled by arm lifting cylinders. Steering cannot be performed while lifting the arm, and arm lifting cannot be performed while steering. The traditional way to solve this technical problem is to connect two hydraulic valves in parallel, which are used to control steering and arm lifting operations respectively. However, the two hydraulic valves take up a large space, and the hydraulic oil coming out of the oil outlet is still under pressure, which cannot meet the energy-saving requirements of electric forklifts.

[0003] Therefore, it is necessary to design a hydraulic valve group that can reduce space occupancy and control steering and arm lifting, so as to realize secondary recycling of hydraulic oil when controlling steering, so as to control the arm lifting operation and achieve energy saving effect. Summary of the invention

[0004] The purpose of the present invention is to provide a fully hydraulic steering gear hydraulic valve group, aiming to solve the technical problem that the steering operation and arm lifting operation of an electric forklift are controlled by two groups of hydraulic valves respectively, and the hydraulic oil coming out of the oil outlet is still under pressure, making it difficult to achieve energy saving.

[0005] To achieve the above object, the technical solution adopted by the present invention is to provide a hydraulic valve group of a fully hydraulic steering gear, comprising: The valve body is provided with four oil ports on one side, namely, the T oil port, the P oil port, the A oil port and the EF oil port, and the B oil port is provided on the other side. The four oil ports and the B oil port are all connected to the inside of the valve body, wherein the T oil port and the P oil port are used to connect to the hydraulic pump station, the A oil port and the B oil port are used to connect to the steering cylinder of the electric forklift to control the steering operation of the electric forklift, and the EF oil port is used to connect to the multi-way valve of the arm lifting cylinder so that the pressure of the output hydraulic oil is used to drive the arm lifting cylinder of the electric forklift to move; A valve sleeve is arranged inside the valve body, an oil path is formed inside the valve sleeve, and the valve sleeve has a degree of freedom to move inside the valve body. A plurality of groups of oil outlets are evenly distributed along the circumference of the valve sleeve near one end thereof; A valve core is connected to the valve sleeve and has an oil circuit formed inside, and is used to control the opening and closing of the oil port A and the oil port B, so as to change the flow path of the hydraulic oil; Among them, an oil groove for the flow of hydraulic oil is formed on the inner wall of the valve body, which is connected with the valve sleeve and the valve core. A series oil circuit is formed inside the valve body to control the opening and closing of the oil port and the B oil port to change the flow path of the hydraulic oil, thereby controlling the steering cylinder of the electric forklift to provide the remaining hydraulic energy to the multi-way valve used to control the arm lifting cylinder when working.

[0006] In a possible implementation, the valve core has a plurality of groups of oil grooves evenly distributed along its circumference near one end thereof, and the oil grooves are connected to the interior of the valve core to change the moving direction of the hydraulic oil.

[0007] In a possible implementation, the number of the multiple groups of oil outlets on the valve sleeve is three and they are arranged at equal intervals, and the hydraulic oil passing through the valve core flows out through the oil outlet to return oil for the arm lifting cylinder to move.

[0008] The beneficial effect of a hydraulic valve group for a full hydraulic steering gear provided by the present invention is that: compared with the prior art, the hydraulic valve group for a full hydraulic steering gear provided by the present invention includes a valve body, a valve sleeve and a valve core, four oil ports are arranged on one side of the valve body, namely, a T oil port, a P oil port, an A oil port and an EF oil port, and a B oil port is arranged on the other side, the four oil ports and the B oil port are all connected to the interior of the valve body, wherein the T oil port and the P oil port are used to connect to the hydraulic pump station, the A oil port and the B oil port are used to connect to the steering cylinder of the electric forklift to control the steering operation of the electric forklift, the EF oil port is used to connect to the multi-way valve of the arm lifting cylinder, so that the pressure of the output hydraulic oil is used to drive the arm lifting cylinder of the electric forklift to move, and a groove body for the flow of hydraulic oil is formed on the inner wall of the valve body; the valve sleeve is arranged inside the valve body, and an oil circuit is formed inside , having the freedom to move inside the valve body, the valve sleeve has multiple groups of oil outlets evenly distributed along its circumference near one end thereof; the valve core is connected to the valve sleeve in cooperation, and an oil circuit is formed inside the valve sleeve for controlling the on-off of the oil port and the B oil port to change the flow path of the hydraulic oil; wherein, by controlling the movement of the valve core to control the on-off of the oil port and the B oil port, the steering cylinder of the electric forklift is controlled to provide the pressure of the remaining hydraulic oil to the arm lifting cylinder during operation, which solves the technical problem that the steering operation and arm lifting operation of the electric forklift are respectively controlled by two groups of hydraulic valves, and the hydraulic oil coming out of the oil outlet still has pressure, making it difficult to achieve energy saving. The valve core has the function of using one group of hydraulic valves for the steering and arm lifting operations of the electric forklift, and the hydraulic oil can be reused to achieve the technical effect of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 A cross-sectional view of the valve body structure of a hydraulic valve group of a full hydraulic steering gear provided by an embodiment of the present invention; Figure 2 A side view of a valve body of a hydraulic valve group of a full hydraulic steering gear provided by an embodiment of the present invention in one direction; Figure 3 A side view of a valve body of a hydraulic valve group of a full hydraulic steering gear provided by an embodiment of the present invention from another direction; Figure 4 for Figure 6 Schematic diagram of the structure at BB in FIG. Figure 5 for Figure 2 Expanded view at AA in the figure; Figure 6 A side view of a valve body of a hydraulic valve group of a full hydraulic steering gear provided by an embodiment of the present invention from another direction; Figure 7 for Figure 5 Schematic diagram of the structure at CC in; Figure 8 for Figure 4 A magnified view of the structure at position I in FIG. Fig. 9 for Figure 3 Schematic diagram of K-direction structure; Fig.10 for Figure 3 Schematic diagram of the P-direction structure; Fig.11 for Figure 6 Schematic diagram of the structure at DD in the figure; Fig.12 for Figure 6 Schematic diagram of the structure at FF in FIG. Fig.13 for Figure 1 The enlarged view of G in the figure; Fig.14 A cross-sectional view of a valve sleeve structure of a hydraulic valve group of a full hydraulic steering gear provided by an embodiment of the present invention; Fig.15 A cross-sectional view of a valve core structure of a hydraulic valve group of a full hydraulic steering gear provided by an embodiment of the present invention; Fig.16 A valve core structure diagram of a hydraulic valve group of a full hydraulic steering gear provided by an embodiment of the present invention; Fig.17 An overall hydraulic oil path diagram of a hydraulic valve group of a full hydraulic steering gear provided by an embodiment of the present invention; Fig.18 A hydraulic oil path diagram of a hydraulic valve group of a full hydraulic steering device provided in an embodiment of the present invention when the steering cylinder is not working and the arm lifting cylinder is working (the bold line in the figure indicates working); Fig.19 A hydraulic oil path diagram of a full hydraulic steering gear hydraulic valve group when the steering cylinder is working and the arm lifting cylinder is not working provided in an embodiment of the present invention (the bold line in the figure indicates working).

[0011] Description of reference numerals: 1. Valve body; 2. Valve sleeve; 3. Valve core; 4. Oil port; 5. Oil port B; 6. Oil tank; 7. Auxiliary oil tank; 8. Oil outlet; 9. Oil tank; 10. Gear pump; 11. Steering cylinder; 12. Multi-way valve. DETAILED DESCRIPTION

[0012] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0013] Please also read Figures 1 to 16 , a hydraulic valve group for a fully hydraulic steering gear provided by the present invention is now described. The fully hydraulic steering gear hydraulic valve group comprises a valve body 1, a valve sleeve 2 and a valve core 3. Four oil ports 4 are arranged on one side of the valve body 1, namely, a T oil port, a P oil port, an A oil port and an EF oil port, and a B oil port 5 is arranged on the other side. The four oil ports 4 and the B oil port 5 are all connected to the inside of the valve body 1, wherein the T oil port and the P oil port are used to connect to the hydraulic pump station, the A oil port and the B oil port 5 are used to connect to the steering cylinder of the electric forklift to control the steering operation of the electric forklift, and the EF oil port is used to connect to the multi-way valve of the arm lifting cylinder so that the pressure of the output hydraulic oil is used to drive the arm lifting cylinder of the electric forklift to move; the valve sleeve 2 is arranged inside the valve body 1 , an oil circuit is formed inside, and it has the freedom to move inside the valve body 1. The valve sleeve 2 is close to one end thereof and has multiple groups of oil outlets evenly distributed along its circumferential direction; the valve core 3 is connected to the valve sleeve 2, and an oil circuit is formed inside, which is used to control the on-off of the oil port 4 and the B oil port 5 to change the flow path of the hydraulic oil; wherein, an oil groove 6 for the flow of hydraulic oil is formed on the inner wall of the valve body 1, which is connected with the valve sleeve 2 and the valve core 3, and a series oil circuit is formed inside the valve body 1, which is used to control the on-off of the oil port and the B oil port to change the flow path of the hydraulic oil, and then control the steering cylinder of the electric forklift to provide the remaining hydraulic energy to the multi-way valve used to control the arm lifting cylinder when working.

[0014] The present invention provides a fully hydraulic steering gear hydraulic valve group. The four "oil ports" on the existing valve body 1 are T oil port, P oil port, A oil port and B oil port, which can be defined as four "traditional oil ports". Compared with the prior art, the present invention sets the "B oil port" in the "traditional oil port" on the other side of the valve body 1, that is, the B oil port 5 in the present invention, and the newly set EF oil port is set at the position of the "B oil port" of the original "traditional oil port", that is, the valve body 1 structure in the present invention is formed. Among them, the oil circuits of the connected T oil port, P oil port, A oil port and B oil port 5 refer to the oil circuits of the steering cylinder of the electric forklift in the prior art, and the oil circuit connected to the EF oil port is used to control the oil circuit of the multi-way valve of the arm lifting cylinder.

[0015] The present invention can realize the two actions of steering and arm lifting by using a group of hydraulic valve groups, realizes the secondary utilization of hydraulic oil pressure, solves the technical problem that the steering operation and arm lifting operation of the electric forklift are controlled by two groups of hydraulic valves respectively, the hydraulic oil flowing out of the oil outlet still has pressure, and it is not easy to achieve energy saving. The present invention has the advantages that one group of hydraulic valve groups can be used for the steering and arm lifting operations of the electric forklift, the hydraulic oil can be reused, and the technical effect of energy saving is achieved.

[0016] In some embodiments, see Figures 1 to 16 The valve core 3 has a plurality of auxiliary oil grooves 7 evenly distributed along its circumference near one end thereof, and the auxiliary oil grooves 7 are connected to the interior of the valve core 3 to change the moving direction of the hydraulic oil.

[0017] In some embodiments, see Figures 1 to 16 The number of the multiple groups of oil outlets 8 on the valve sleeve 2 is three and they are arranged at equal intervals. The hydraulic oil passing through the valve core 3 flows out through the oil outlet 8 and returns to the oil for the action of the arm lifting cylinder.

[0018] Please also read Figures 17 to 19 , the figure shows the working principle diagram of the flow path of the hydraulic oil inside the hydraulic valve group of the present invention. Fig.17 This is the hydraulic oil path diagram when the steering cylinder and arm lifting cylinder of the electric forklift are both working. Fig.18 This is the hydraulic oil path diagram when the steering cylinder is not working and the arm lifting cylinder is working. Fig.19 This is the hydraulic oil path diagram when the steering cylinder is working and the arm lifting cylinder is not working.

[0019] The hydraulic valve group of the fully hydraulic steering gear of the present invention is applied to an electric forklift. On the basis of the prior art, the oil circuit of the hydraulic oil is changed by improving the valve body 1, the valve sleeve 2 and the valve core 3, so that the steering and arm lifting operations of the electric forklift can be realized through a group of hydraulic valve groups, thereby realizing the secondary utilization of the hydraulic oil and achieving the effect of energy saving.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully hydraulic steering gear hydraulic valve group, characterized in that: include: The valve body is provided with four oil ports on one side, namely, the T oil port, the P oil port, the A oil port and the EF oil port, and the B oil port is provided on the other side. The four oil ports and the B oil port are all connected to the inside of the valve body, wherein the T oil port and the P oil port are used to connect to the hydraulic pump station, the A oil port and the B oil port are used to connect to the steering cylinder of the electric forklift to control the steering operation of the electric forklift, and the EF oil port is used to connect to the multi-way valve of the arm lifting cylinder so that the pressure of the output hydraulic oil is used to drive the arm lifting cylinder of the electric forklift to move; A valve sleeve is arranged inside the valve body, an oil path is formed inside the valve sleeve, and the valve sleeve has a degree of freedom to move inside the valve body. A plurality of groups of oil outlets are evenly distributed along the circumference of the valve sleeve near one end thereof; A valve core is connected to the valve sleeve and has an oil circuit formed therein for controlling the opening and closing of the oil port A and the oil port B to change the flow path of the hydraulic oil; Among them, an oil groove for the flow of hydraulic oil is formed on the inner wall of the valve body, which is connected with the valve sleeve and the valve core. A series oil circuit is formed inside the valve body to control the opening and closing of the oil port and the B oil port to change the flow path of the hydraulic oil, thereby controlling the steering cylinder of the electric forklift to provide the remaining hydraulic energy to the multi-way valve used to control the arm lifting cylinder when working.

2. A fully hydraulic steering gear hydraulic valve group as claimed in claim 1, characterized in that: The valve core has a plurality of oil grooves evenly distributed along its circumference near one end thereof, and the oil grooves are connected to the interior of the valve core to change the moving direction of the hydraulic oil.

3. A hydraulic valve group for a fully hydraulic steering gear as claimed in claim 1, characterized in that: The number of the multiple groups of oil outlets on the valve sleeve is three and they are arranged at equal intervals. The hydraulic oil passing through the valve core flows out through the oil outlets and returns to the oil for the action of the arm lifting cylinder.

Images