Hydraulic valve group of full-hydraulic steering gear

Abstract

The utility model provides a hydraulic valve group of a full hydraulic steering gear, which belongs to the technical field of hydraulic valve groups, and comprises a valve body, a valve sleeve and a valve core, one side of the valve body is provided with four oil ports, namely an oil port T, an oil port P, an oil port A and an oil port EF, the other side of the valve body is provided with an oil port B, and the oil port T and the oil port P are used for being communicated with a hydraulic pump station. The oil port A and the oil port B are used for being communicated with a steering oil cylinder of the electric forklift, and the oil port EF is used for being communicated with a multi-way valve of an inserting arm lifting oil cylinder, so that the steering oil cylinder of the electric forklift is controlled to provide the pressure of residual hydraulic oil to the inserting arm lifting oil cylinder during working. The hydraulic valve group of the full-hydraulic steering gear has the technical effects that a group of power units 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 realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydraulic valve group technical field, more specifically, relate to a kind of full hydraulic steering gear hydraulic valve group. BACKGROUND

[0002] Electric fork truck, low-speed machine, engineering vehicle etc. are often used to realize the direction control and pressure control of machine operation by hydraulic valve group, especially on traditional electric fork truck, hydraulic valve mainly controls steering and arm lifting, steering is controlled by steering cylinder, arm lifting is controlled by arm lifting cylinder, steering cannot be carried out while lifting arm, arm lifting operation cannot be carried out while steering, the traditional method to solve this technical problem is to connect two hydraulic valves in parallel, which are used to control steering and arm lifting operation respectively. However, two hydraulic valves occupy a large space, and the hydraulic oil from the oil outlet still has pressure, which cannot meet the energy-saving requirements of electric fork truck.

[0003] Therefore, it is necessary to design a hydraulic valve group that can reduce space occupation and control steering and arm lifting, to realize secondary recycling of hydraulic oil while controlling steering, to control arm lifting operation, and to achieve energy-saving effect. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of full hydraulic steering gear hydraulic valve group, to solve the technical problem that steering operation and arm lifting operation of electric fork truck are controlled by two groups of hydraulic valves respectively, and the hydraulic oil from the oil outlet still has pressure, which is not easy to realize energy saving.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a kind of full hydraulic steering gear hydraulic valve group, comprising:

[0006] Valve body, one side is provided with four oil ports, respectively T oil port, P oil port, A oil port and EF oil port, the other side is provided with B oil port, four oil ports and B oil port are all communicated to the inside of valve body, wherein T oil port and P oil port are used to connect hydraulic pump station, A oil port and B oil port are used to connect steering cylinder of electric fork truck, to control steering operation of electric fork truck, EF oil port is used to connect multi-way valve of arm lifting cylinder, to make the pressure of output hydraulic oil be used to drive arm lifting cylinder of electric fork truck to act;

[0007] Valve sleeve, inside of valve body, oil circuit is formed, has the freedom degree of movement in the inside of valve body, the valve sleeve is close to its one end and is uniformly distributed with multiple oil outlets along its circumference;

[0008] Valve core, cooperate and connect valve sleeve, oil circuit is formed in the inside, for controlling the on-off of oil port and B oil port, to change the flow path of hydraulic oil;

[0009] The valve body inner wall is formed with an oil groove for the flow of hydraulic oil, and is connected with the valve sleeve and the valve core, and the valve body interior is formed with a series oil path for controlling the on-off of the oil port and the B oil port to change the flow path of the hydraulic oil, thereby providing the residual hydraulic energy to the multi-way valve for controlling the arm lifting cylinder when the electric forklift steering cylinder works.

[0010] In a possible implementation, the valve core is uniformly distributed with multiple groups of oil grooves along the circumference near one end thereof, and the oil grooves are communicated to the interior of the valve core to change the moving direction of the hydraulic oil.

[0011] In a possible implementation, the number of the multiple groups of oil outlets on the valve sleeve is three and is equally spaced, and the hydraulic oil passing through the valve core flows out through the oil outlets to be returned to the oil tank for the action of the arm lifting cylinder.

[0012] The hydraulic valve group of the full hydraulic steering device has the advantages that, compared with the prior art, the hydraulic valve group of the full hydraulic steering device includes a valve body, a valve sleeve and a valve core, one side of the valve body is provided with four oil ports, namely a T oil port, a P oil port, an A oil port and an EF oil port, and the other side is provided with a B oil port, the four oil ports and the B oil port are all communicated to the interior of the valve body, the T oil port and the P oil port are used to communicate the hydraulic pump station, the A oil port and the B oil port are used to communicate the steering cylinder of the electric forklift to control the steering operation of the electric forklift, the EF oil port is used to communicate the multi-way valve of the arm lifting cylinder to make the pressure of the output hydraulic oil drive the arm lifting cylinder of the electric forklift to act, the valve body inner wall is formed with a groove for the flow of hydraulic oil, the valve sleeve is arranged in the interior of the valve body and is formed with an oil path and has the freedom of movement in the interior of the valve body, the valve sleeve is uniformly distributed with multiple groups of oil outlets along the circumference near one end thereof, the valve core is connected with the valve sleeve and is formed with an oil path in the interior for controlling the on-off of the oil port and the B oil port to change the flow path of the hydraulic oil, the valve core is controlled to move to control the on-off of the oil port and the B oil port, thereby providing the pressure of the residual hydraulic oil to the arm lifting cylinder when the steering cylinder of the electric forklift works, the technical problem that the steering operation and the arm lifting operation of the electric forklift are respectively controlled by two groups of hydraulic valves and the hydraulic oil from the oil outlet still has pressure and is not easy to realize energy saving is solved, one group of hydraulic valves can be used for the steering and arm lifting operation of the electric forklift, the hydraulic oil can be used twice, and the technical effect of energy saving is realized. BRIEF DESCRIPTION OF DRAWINGS

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A cross-sectional view of the valve body structure of a hydraulic valve group for a fully hydraulic steering gear, provided for an embodiment of this utility model;

[0015] Figure 2 A side view of the valve body of a hydraulic valve group for a fully hydraulic steering gear, provided for an embodiment of this utility model;

[0016] Figure 3 A side view of the valve body of a hydraulic valve group for a fully hydraulic steering gear, provided as an embodiment of this utility model;

[0017] Figure 4 for Figure 6 Schematic diagram of the structure at point BB in the diagram;

[0018] Figure 5 for Figure 2 The unfolded diagram at point AA in the diagram;

[0019] Figure 6 A side view of the valve body of a hydraulic valve group for a fully hydraulic steering gear, provided as an embodiment of this utility model;

[0020] Figure 7 for Figure 5 Schematic diagram of the structure at point C;

[0021] Figure 8 for Figure 4 Enlarged view of the structure at point I in the image;

[0022] Figure 9 for Figure 3 A schematic diagram of the K-axis structure in the diagram;

[0023] Figure 10 for Figure 3 A schematic diagram of the P-direction structure in the diagram;

[0024] Figure 11 for Figure 6 Schematic diagram of the structure at DD in the diagram;

[0025] Figure 12 for Figure 6 Schematic diagram of the structure at FF in the diagram;

[0026] Figure 13 for Figure 1 Enlarged view of point G in the image;

[0027] Figure 14 A cross-sectional view of the valve sleeve structure of a hydraulic valve group for a fully hydraulic steering gear, provided for an embodiment of this utility model;

[0028] Figure 15 A cross-sectional view of the valve core structure of a hydraulic valve group for a fully hydraulic steering gear, provided for an embodiment of this utility model;

[0029] Figure 16 A valve core structure diagram of a hydraulic valve group for a fully hydraulic steering gear provided for an embodiment of this utility model;

[0030] Figure 17 A hydraulic oil overall path diagram of a hydraulic valve group for a fully hydraulic steering gear provided for an embodiment of this utility model;

[0031] Figure 18 A hydraulic oil path diagram of a fully hydraulic steering gear hydraulic valve group when the steering cylinder is not working and the boom lifting cylinder is working (the bold line in the diagram indicates the working state).

[0032] Figure 19 The hydraulic oil path diagram of a fully hydraulic steering gear hydraulic valve group when the steering cylinder is working and the boom lifting cylinder is not working is provided for the embodiment of this utility model (the bold line in the figure indicates the working state).

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Valve body; 2. Valve sleeve; 3. Valve core; 4. Oil port; 5. B oil port; 6. Oil trough; 7. Auxiliary oil trough; 8. Oil outlet; 9. Oil tank; 10. Gear pump; 11. Steering cylinder; 12. Multi-way valve. Detailed Implementation

[0035] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0036] Please refer to the following: Figures 1 to 16This invention provides a hydraulic valve assembly for a fully hydraulic steering gear. The hydraulic valve assembly includes a valve body 1, a valve sleeve 2, and a valve core 3. The valve body 1 has four ports 4 on one side: T port, P port, A port, and EF port. The other side has a B port 5. All four ports 4 and the B port 5 are connected to the interior of the valve body 1. The T port and P port are connected to a hydraulic pump station. The A port and B port 5 are connected to the steering cylinder of an electric forklift to control the steering operation of the electric forklift. The EF port is connected to a multi-way valve of the boom lift cylinder so that the pressure of the output hydraulic oil is used to drive the boom lift cylinder of the electric forklift. The valve sleeve 2 is located inside the valve body 1. The valve body 1 has an internal oil passage and a degree of freedom of movement within it. The valve sleeve 2 has multiple sets of oil outlets evenly distributed circumferentially near one end. The valve core 3 is connected to the valve sleeve 2 and has an internal oil passage for controlling the opening and closing of the oil port 4 and the B port 5 to change the flow path of the hydraulic oil. The inner wall of the valve body 1 has an oil groove 6 for hydraulic oil flow, which is connected to the valve sleeve 2 and the valve core 3. The valve body 1 has a series oil passage for controlling the opening and closing of the oil port and the B port to change the flow path of the hydraulic oil, thereby controlling the remaining hydraulic energy supplied to the multi-way valve for controlling the boom lifting cylinder when the electric forklift's steering cylinder is working.

[0037] This utility model provides a hydraulic valve assembly for a fully hydraulic steering gear. The existing valve body 1 has four "oil ports"—T port, P port, A port, and B port—which can be defined as four "traditional oil ports." Compared to the prior art, this utility model places the "B port" of the "traditional oil ports" on the other side of the valve body 1, i.e., B port 5 in this utility model. A new EF port is added, positioned at the location of the original "B port" of the "traditional oil ports," thus forming the valve body 1 structure as described in this utility model. The oil circuits connecting the T port, P port, A port, and B port 5 are connected to the oil circuits of the steering cylinder of an electric forklift, similar to those in the prior art. The oil circuit connecting the EF port controls the multi-way valve of the boom lifting cylinder.

[0038] This invention enables both steering and boom lifting operations using a single hydraulic valve assembly, achieving secondary utilization of hydraulic oil pressure. It solves the technical problem that steering and boom lifting operations in electric forklifts are controlled by two separate hydraulic valve assemblies, resulting in hydraulic oil still having pressure at the outlet and hindering energy conservation. The invention utilizes a single hydraulic valve assembly for both steering and boom lifting operations in electric forklifts, allowing for secondary use of the hydraulic oil and achieving energy savings.

[0039] In some embodiments, please refer to Figures 1 to 16The valve core 3 has multiple sets of auxiliary oil grooves 7 evenly distributed along its circumference near one end. The auxiliary oil grooves 7 are connected to the interior of the valve core 3 to change the direction of hydraulic oil movement.

[0040] In some embodiments, please refer to Figures 1 to 16 The valve sleeve 2 has three sets of oil outlets 8 arranged at equal intervals. The hydraulic oil through the valve core 3 flows out through the oil outlets 8 to return oil, which is used for the operation of the boom lifting cylinder.

[0041] Please refer to the following: Figures 17 to 19 The figure shows the working principle diagram of the hydraulic oil flow path inside the hydraulic valve group of this utility model. Figure 17 This is a hydraulic oil path diagram for an electric forklift when both the steering cylinder and the boom lifting cylinder are working. Figure 18 This is a hydraulic oil path diagram showing the hydraulic oil path when the steering cylinder is not in operation and the boom lifting cylinder is in operation. Figure 19 This is a hydraulic oil path diagram when the steering cylinder is working and the boom lifting cylinder is not working.

[0042] The hydraulic valve group of the fully hydraulic steering gear of this utility model is applied to electric forklifts. Based on the existing technology, by improving the valve body 1, valve sleeve 2 and valve core 3, the oil circuit of the hydraulic oil is changed, which can realize the steering and boom lifting operation of the electric forklift through a set of hydraulic valve groups, realize the secondary utilization of hydraulic oil, and achieve the effect of energy saving.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic valve assembly for a fully hydraulic steering gear, characterized in that, include: The valve body has four oil ports on one side, namely T port, P port, A port and EF port, and B port on the other side. All four oil ports and B port are connected to the interior of the valve body. The T port and P port are used to connect to the hydraulic pump station. The A port and B port are used to connect to the steering cylinder of the electric forklift to control the steering operation of the electric forklift. The EF port is used to connect to the multi-way valve of the boom lift cylinder so that the pressure of the output hydraulic oil is used to drive the boom lift cylinder of the electric forklift. A valve sleeve is located inside the valve body and has an oil passage inside. It has a degree of freedom to move inside the valve body. Multiple sets of oil outlets are evenly distributed along its circumference near one end of the valve sleeve. The valve core, which is connected to the valve sleeve, has an internal oil passage for controlling the opening and closing of the oil port and the B oil port to change the flow path of the hydraulic oil. The valve body has an oil groove on its inner wall for hydraulic oil flow, which is connected to the valve sleeve and the valve core. The valve body has a series oil circuit inside, which is used to control the opening and closing of the oil port and the B oil port to change the flow path of the hydraulic oil. This controls the electric forklift's steering cylinder to supply the remaining hydraulic energy to the multi-way valve used to control the boom lifting cylinder when it is working.

2. The hydraulic valve assembly of a fully hydraulic steering system as described in claim 1, characterized in that, The valve core has multiple sets of oil grooves evenly distributed along its circumference near one end. The oil grooves are connected to the interior of the valve core to change the direction of hydraulic oil movement.

3. The hydraulic valve assembly of a fully hydraulic steering system as described in claim 1, characterized in that, The valve sleeve has three sets of oil outlets arranged at equal intervals. The hydraulic oil passing through the valve core flows out through the oil outlets for return oil to be used for the operation of the boom lifting cylinder.

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