Reversing servo valve and hydraulic control system

Abstract

The utility model discloses a reversing servo valve and a hydraulic control system, the reversing servo valve comprises a valve body, a containing cavity is arranged in the valve body, the side wall of the valve body is provided with a first working port, an oil inlet, a second working port and an oil return port, and the first working port, the oil inlet, the second working port and the oil return port are all communicated with the containing cavity; the valve core is linearly and movably arranged in the accommodating cavity, and the valve core is provided with a connecting end; the driving mechanism comprises a rotary driving device and an eccentric wheel; the eccentric wheel is movably matched with the connecting end of the valve core; the rotation driving device drives the eccentric wheel to rotate to drive the valve element to move in the containing cavity. When the valve element is at the first position, the first working opening communicates with the oil inlet, and the second working opening communicates with the oil return opening. And at the second position, the second working port communicates with the oil inlet, and the first working port communicates with the oil return port. The eccentric wheel structure drives the valve element to reciprocate, so that the reliability of the reversing valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of servo valves, in particular to a reversing servo valve and a hydraulic control system. Background Art

[0002] The existing reversing valves are mainly electromagnetic reversing valves, which are usually composed of a valve body, a valve core, an electromagnet, etc. When the electromagnet is energized, the magnetic field generated acts on the valve core, attracting the valve core to one side of the electromagnet, thereby closing the original passage and opening a new passage to change the flow direction of the fluid. When the electromagnet is powered off, the valve core returns to its original position, the original passage is restored, and the fluid flow direction returns to its initial state. However, the electromagnet in the electromagnetic reversing valve may be interfered by external factors such as electromagnetic interference and voltage fluctuations, affecting the normal operation of the reversing valve. In addition, the existing electromagnetic reversing valve has high requirements for oil cleanliness. When the cleanliness of the hydraulic oil deteriorates, the valve core may get stuck and not work. In addition, the electromagnetic reversing valve has a slow response speed and cannot adapt to high-speed motion systems. Summary of the invention

[0003] The utility model aims to provide a reversing servo valve to solve the problems raised by the background technology.

[0004] To achieve the purpose of the invention, the utility model provides a reversing servo valve, comprising:

[0005] A valve body, wherein a receiving cavity is arranged in the valve body, and a first working port, an oil inlet, a second working port and an oil return port are arranged on a side wall of the valve body, wherein the first working port, the oil inlet, the second working port and the oil return port are all connected to the receiving cavity;

[0006] A valve core is linearly movable and arranged in the accommodating cavity, and the valve core has a connecting end;

[0007] The driving mechanism comprises a rotary driving device and an eccentric wheel; the eccentric wheel is movably matched with the connecting end of the valve core; the rotary driving device drives the eccentric wheel to rotate so as to drive the valve core to move in the accommodating chamber;

[0008] The valve core has at least a first position and a second position in the accommodating chamber. In the first position, the first working port is connected to the oil inlet, and the second working port is connected to the oil return port; in the second position, the second working port is connected to the oil inlet, and the first working port is connected to the oil return port.

[0009] As a preferred solution, a slot is provided on one side of the valve body; the eccentric wheel is accommodated in the slot.

[0010] As a preferred solution, a strip hole is provided at the connecting end of the valve core, the length direction of the strip hole is perpendicular to the moving direction of the valve core, and the eccentric wheel is movably matched with the strip hole;

[0011] The eccentric wheel comprises a connecting portion and a movable portion, wherein the connecting portion is connected to the rotary drive device, the movable portion is eccentrically arranged at one side of the connecting portion, and the movable portion is slidably matched with the strip-shaped hole.

[0012] As a preferred solution, the rotation drive device includes a servo motor; the servo motor includes a body and an output shaft, the body is arranged on one side of the valve body, and the output shaft is fixed to the connecting part of the eccentric wheel.

[0013] As a preferred solution, it also includes a motor fixing seat, which is installed on one side of the valve body and covers the body of the servo motor.

[0014] As a preferred solution, the first working port, the oil inlet port, the second working port and the oil return port are arranged in sequence along the length direction of the valve core.

[0015] The utility model also provides a hydraulic control system, comprising the above-mentioned reversing servo valve and a hydraulic actuator; the hydraulic actuator is connected to the reversing servo valve.

[0016] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0017] The reversing servo valve provided by the utility model drives the valve core to move linearly in the valve body through the eccentric wheel structure, and does not need to set the electromagnet structure, which can solve the problem that the reversing valve in the prior art may be disturbed by external factors such as electromagnetic interference and voltage fluctuation, and the cleanliness of the hydraulic oil is poor, which affects the normal operation of the reversing valve. The structure has high reliability and can reduce the impact force caused by the reversing of the valve core. In addition, the flow of the first working port and the second working port can be adjusted by controlling the rotation angle of the eccentric wheel, which is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the servo reversing valve when the valve core is in the first position in the embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the servo reversing valve when the valve core is in the second position in the embodiment of the utility model;

[0021] Figure 3 It is a three-dimensional diagram of the valve core in the embodiment of the utility model;

[0022] Description of Figure Numbers:

[0023] 1. Valve body; 11. Accommodating chamber; 12. Oil return channel; 2. Valve core; 21. Strip hole; 22. First flow groove; 23. Second flow groove; 24. Third flow groove; 3. Rotary drive device; 31. Servo motor; 311. Output shaft; 4. Eccentric wheel; 41. Connecting part; 42. Moving part; A. First working port; P. Oil inlet; B. Second working port; T. Oil return port. DETAILED DESCRIPTION

[0024] In order to facilitate a better understanding of the purpose, structure, features and efficacy of the utility model, the utility model is further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that the features shown in the figures are not necessarily drawn to scale. In addition, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Based on the described embodiments of the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0025] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "front", "back" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In addition, in the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0026] See also Figure 1-2The utility model provides a reversing servo valve, including a valve body 1, a valve core 2, and a driving mechanism. A housing chamber 11 is arranged in the valve body 1 for accommodating the valve core 2. The side wall of the valve body 1 is provided with a first working port A, an oil inlet port P, a second working port B and an oil return port T, and the first working port A, the oil inlet port P, the second working port B and the oil return port T are all connected to the housing chamber 11. The valve core 2 can be linearly movably arranged in the housing chamber 11, and the valve core 2 has a connecting end for connecting to the driving mechanism. The driving mechanism includes a rotary driving device 3 and an eccentric wheel 4; the eccentric wheel 4 is connected to the rotary driving device and the eccentric wheel 4 is movably matched with the connecting end of the valve core 2; the rotary driving device drives the eccentric wheel 4 to rotate to drive the valve core 2 to reciprocate in the housing chamber 11. The valve core 2 has at least a first position and a second position in the accommodating chamber 11. In the first position, the first working port A is connected to the oil inlet P, and the second working port B is connected to the oil return port; in the second position, the second working port B is connected to the oil inlet P, and the first working port A is connected to the oil return port. The eccentric wheel 4 drives the valve core 2 to move back and forth, which can solve the problem in the prior art that the electromagnet may be interfered by external factors such as electromagnetic interference and voltage fluctuations, affecting the normal operation of the reversing valve. In addition, the flow of the first working port and the second working port B can be adjusted by controlling the rotation angle of the eccentric wheel 4, which is more convenient to use. Under the control of the driving mechanism, the valve core 2 can also be slightly offset in the accommodating chamber 11. To adjust the flow of the first working port A or the second working port B.

[0027] See also Figure 1-Figure 3 In one embodiment, a slot is provided on one side of the valve body 1; the eccentric wheel 4 is received in the slot. A strip hole 21 is provided at the connecting end of the valve core 2, the length direction of the strip hole 21 is perpendicular to the moving direction of the valve core 2, and the eccentric wheel 4 is movably matched with the strip hole 21.

[0028] Furthermore, the eccentric wheel 4 includes a connecting portion 41 and a movable portion 42. The connecting portion 41 is connected to the rotation drive device 3. The movable portion 42 is eccentrically arranged on one side of the connecting portion 41. The movable portion 42 is slidably matched with the strip hole 21. In this embodiment, the movable portion 42 is arranged in a cylindrical shape to reduce the friction with the inner wall of the strip hole 21. In other embodiments, the movable portion 42 can also be arranged in a spherical shape or other shapes. When the rotation drive device 3 drives the eccentric wheel 4 to rotate, the movable portion 42 moves back and forth along the strip hole 21. Figure 3 The valve core 2 is provided with a first flow groove 22, a second flow groove 23 and a third flow groove 24 in sequence along its length direction. Figure 1When the movable portion 42 of the eccentric wheel 4 rotates to a position far from the movable chamber, the valve core 2 is in the first position, the oil inlet P, the first flow groove 22 and the first working port A are connected, and the oil return port, the second flow groove 23 and the second working port B are connected; Figure 2 As shown, when the movable portion 42 of the eccentric wheel 4 rotates relatively close to the movable chamber, the valve core 2 is in the second position. At this time, the oil inlet P is disconnected from the first working port A and communicated with the second working port B through the second flow groove. At the same time, the oil return port is disconnected from the second working port B and communicated with the first working port A through the oil return channel 12 and the first flow groove 22, thereby realizing the switching of the oil path direction.

[0029] See also Figure 1-Figure 3 In one embodiment, the rotation drive device 3 includes a servo motor 31; the servo motor 31 includes a body and an output shaft 311, the body is arranged on one side of the valve body 1, and the output shaft 311 is fixed to the connecting portion 41 of the eccentric wheel 4. The movable portion 42 deviates from the output shaft 311. The servo motor 31 is provided with a high-precision encoder, and the rotation angle can be controlled by the high-precision encoder to accurately control the reversing and the flow of the first working port A and the second working port B.

[0030] See also Figure 1-2 In one embodiment, the first working port A, the oil inlet port P, the second working port B and the oil return port are sequentially arranged along the length direction of the valve core 2. In other embodiments, the order in which the oil inlet port P, the second working port B and the oil return port are arranged can be adaptively adjusted.

[0031] The utility model discloses a hydraulic control system, comprising the above-mentioned reversing servo valve and a hydraulic actuator; the hydraulic actuator is connected to the reversing servo valve, and the activity direction of the hydraulic actuator can be switched through the reversing servo valve. The hydraulic actuator can be a hydraulic cylinder, a jack, a hydraulic motor or the like.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A reversing servo valve, characterized in that: include: A valve body, wherein a receiving cavity is arranged in the valve body, and a first working port, an oil inlet, a second working port and an oil return port are arranged on a side wall of the valve body, wherein the first working port, the oil inlet, the second working port and the oil return port are all connected to the receiving cavity; A valve core is linearly movable and arranged in the accommodating cavity, and the valve core has a connecting end; The driving mechanism comprises a rotary driving device and an eccentric wheel; the eccentric wheel is movably matched with the connecting end of the valve core; the rotary driving device drives the eccentric wheel to rotate so as to drive the valve core to move in the accommodating chamber; The valve core has at least a first position and a second position in the accommodating chamber. In the first position, the first working port is connected to the oil inlet, and the second working port is connected to the oil return port; in the second position, the second working port is connected to the oil inlet, and the first working port is connected to the oil return port.

2. A reversing servo valve according to claim 1, characterized in that: A strip hole is provided at the connecting end of the valve core, the length direction of the strip hole is perpendicular to the moving direction of the valve core, and the eccentric wheel is movably matched with the strip hole; The eccentric wheel comprises a connecting portion and a movable portion, wherein the connecting portion is connected to the rotary drive device, the movable portion is eccentrically arranged at one side of the connecting portion, and the movable portion is slidably matched with the strip-shaped hole.

3. A reversing servo valve according to claim 2, characterized in that: The rotary drive device comprises a servo motor; the servo motor comprises a body and an output shaft, the body is arranged on one side of the valve body, and the output shaft is fixed to the connecting part of the eccentric wheel.

4. A reversing servo valve according to claim 1, characterized in that: The first working port, the oil inlet port, the second working port and the oil return port are sequentially arranged along the length direction of the valve core.

5. A hydraulic control system, characterized in that: It comprises the reversing servo valve and the hydraulic actuator as described in any one of claims 1 to 4; the hydraulic actuator is connected to the reversing servo valve.

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