Integrated structure of hydraulic servo valve and double-level servo hydraulic cylinder

Abstract

The present invention provides an integrated structure of a hydraulic servo valve and a double-level servo hydraulic cylinder, belonging to the technical field of double-level actuators, which includes a cylinder barrel, a first piston, a second piston, a servo valve and a control system. The two ends of the cylinder barrel are respectively provided with a first piston chamber and a second piston chamber, and a spool chamber is provided in the middle. The spool chamber is communicated with the first piston chamber through a first spool hole, and the spool chamber is communicated with the second piston chamber through a second spool hole; the first piston is movably arranged in the first piston chamber, and the second piston is movably arranged in the second piston chamber; the electromagnetic oil circuit system of the servo valve is electrically connected to the control system, and the electromagnetic oil circuit system can control the movement of the spool. The middle part of the spool has a blocking part, and the spool is movably arranged in the spool chamber of the cylinder barrel, and the blocking part can block the first spool hole or the second spool hole. The present invention can accurately control the servo valve hydraulic cylinder with bidirectional movement through a set of servo valves, with a compact structure, reduced ineffective load and extended high-frequency fatigue life.

Description

Technical Field

[0001] The invention belongs to the technical field of double-level actuators, and particularly relates to an integrated structure of a hydraulic servo valve and a double-level servo hydraulic cylinder. Background Art

[0002] In order to study the characteristics of deep soil underground, it is necessary to conduct tests on soil characteristics. During the test process, high-frequency varying force conditions will occur, and at the same time, centrifugal accelerations of dozens of g will also occur. It is necessary to load the test piece through a double-level actuator to truly simulate its force conditions.

[0003] Due to the complexity of the structure of the centrifuge vibration table, traditional actuators may not have installation space due to their structure and size, so there will be higher requirements for the compactness of the actuator structure size.

[0004] In summary, higher requirements are put forward for the performance of the loading actuator such as structural compactness and high-frequency fatigue life. Therefore, it is of great significance to develop an integrated structure of a hydraulic servo valve and a double-level servo hydraulic cylinder. Summary of the Invention

[0005] In view of this, the present invention aims to propose an integrated structure of a hydraulic servo valve and a double-level servo hydraulic cylinder to alleviate the above technical problems.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows:

[0007] The present invention provides an integrated structure of a hydraulic servo valve and a double-level servo hydraulic cylinder, including a cylinder barrel, a first piston, a second piston, a servo valve, and a control system.

[0008] Wherein, first piston chambers and second piston chambers extending along the length direction of the cylinder barrel are respectively arranged at both ends of the cylinder barrel, a spool chamber extending in the vertical direction is arranged in the middle of the cylinder barrel, a first spool hole and a second spool hole are opened in the spool chamber, the spool chamber is communicated with the first piston chamber through the first spool hole, and the spool chamber is communicated with the second piston chamber through the second spool hole; the first piston is movably arranged in the first piston chamber, and the second piston is movably arranged in the second piston chamber; the servo valve includes an electromagnetic oil circuit system and a spool, the electromagnetic oil circuit system is electrically connected with the control system, the electromagnetic oil circuit system can control the movement of the spool, a blocking part is arranged in the middle of the spool, the spool is movably arranged in the spool chamber of the cylinder barrel, and the blocking part of the spool can block the first spool hole or the second spool hole of the spool chamber.

[0009] Among various alternative embodiments of the above embodiments, preferably, the integrated one-piece structure further includes a displacement sensor and a connecting member, and the displacement sensor is electrically connected to the control system; the displacement sensor is disposed in the first piston cavity, and a displacement end of the displacement sensor is connected to the first piston through the connecting member; alternatively, the displacement sensor is disposed in the second piston cavity, and a displacement end of the displacement sensor is connected to the second piston through the connecting member.

[0010] More preferably, the connecting member is a U-shaped member, a displacement end of the displacement sensor is fixedly connected to a middle portion of the U-shaped member, and two ends of the U-shaped member are fixedly connected to an inner-facing end of the first piston or the second piston through bolts.

[0011] Among various alternative embodiments of the above embodiments, preferably, a sensor electrical socket is provided at a top of the cylinder barrel, and the displacement sensor is electrically connected to the control system through the sensor electrical socket.

[0012] Preferably, the servo valve further includes a spool sleeve, the spool sleeve is sleeved on the spool, and the spool sleeve is fixed in the spool cavity. The spool sleeve is respectively provided with a first avoidance hole and a second avoidance hole at positions of the first spool hole and the second spool hole.

[0013] Among various alternative embodiments of the above embodiments, preferably, the servo valve further includes an upper end cover and a lower end cover, the upper end cover is disposed at a top of the spool cavity, and the lower end cover is disposed at a bottom of the spool cavity.

[0014] Compared with the prior art, a hydraulic servo valve and a dual-level servo hydraulic cylinder integrated one-piece structure provided by the present invention have the following advantages:

[0015] 1. The present invention can accurately control a servo valve hydraulic cylinder with bidirectional movement through a set of servo valves, has a compact structure, reduces ineffective load, and prolongs high-frequency fatigue life;

[0016] 2. The present invention realizes precise closed-loop control of high-frequency piston movement through electrical connection of the servo valve and an internal displacement sensor with the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 is a top view of the hydraulic servo valve and the dual-level servo hydraulic cylinder integrated one-piece structure of the present invention;

[0019] Figure 2 It is a top view sectional view of the integrated structure of the hydraulic servo valve and the double-level servo hydraulic cylinder described in the present invention;

[0020] Figure 3 It is a front view sectional view of the integrated structure of the hydraulic servo valve and the double-level servo hydraulic cylinder described in the present invention.

[0021] Description of the reference numerals:

[0022] 1 - cylinder barrel; 2 - first piston; 3 - second piston; 4 - servo valve; 401 - electromagnetic oil circuit system; 402 - valve core; 403 - valve core sleeve; 404 - upper end cover; 405 - lower end cover; 406 - first valve core hole; 407 - second valve core hole; 408 - blocking portion; 5 - displacement sensor; 6 - connecting member; 7 - sensor electrical socket. Specific embodiments

[0023] The following will give a detailed description of the embodiments of the present invention. These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0024] The following will detail the present invention in conjunction with embodiments.

[0025] The present invention provides an integrated structure of a hydraulic servo valve 4 and a double-level servo hydraulic cylinder. Referring to Figures 1 to 3 , it includes a cylinder barrel 1, a first piston 2, a second piston 3, a servo valve 4 and a control system.

[0026] Among them, a first piston chamber and a second piston chamber extending along the length direction of the cylinder barrel 1 are respectively provided at both ends of the cylinder barrel 1. A valve core chamber extending in the vertical direction is provided in the middle of the cylinder barrel 1. The valve core chamber is provided with a first valve core hole 406 and a second valve core hole 407. The valve core chamber is communicated with the first piston chamber through the first valve core hole 406, and the valve core chamber is communicated with the second piston chamber through the second valve core hole 407. The first piston 2 is movably arranged in the first piston chamber, and the second piston 3 is movably arranged in the second piston chamber. The servo valve 4 includes an electromagnetic oil circuit system 401 and a valve core 402. The electromagnetic oil circuit system 401 is electrically connected to the control system. The electromagnetic oil circuit system 401 can control the movement of the valve core 402. A blocking portion 408 is provided in the middle of the valve core 402. The valve core 402 is movably arranged in the valve core chamber of the cylinder barrel 1, and the blocking portion 408 of the valve core 402 can block the first valve core hole 406 or the second valve core hole 407 of the valve core chamber.

[0027] Specifically and preferably, as Figure 2As shown, grooves are formed at the inner-facing ends of the first piston 2 and the second piston 3.

[0028] In various alternative embodiments of the above-described embodiment, preferably, the integrated one-piece structure further includes a displacement sensor 5 and a connecting member 6. The displacement sensor 5 is electrically connected to the control system. The displacement sensor 5 is disposed in the first piston cavity, and the displacement end of the displacement sensor 5 is connected to the first piston 2 through the connecting member 6. Alternatively, the displacement sensor 5 is disposed in the second piston cavity, and the displacement end of the displacement sensor 5 is connected to the second piston 3 through the connecting member 6.

[0029] Preferably, as Figure 2 shown, the displacement sensor 5 is disposed in the first piston cavity, and the displacement end of the displacement sensor 5 is connected to the first piston 2 through the connecting member 6.

[0030] Further preferably, referring to Figure 2 , the connecting member 6 is a U-shaped member. The displacement end of the displacement sensor 5 is fixedly connected to the middle of the U-shaped member. The two ends of the U-shaped member are fixedly connected to the inner-facing end of the first piston 2 or the second piston 3 through bolts.

[0031] In various alternative embodiments of the above-described embodiment, preferably, referring to Figure 1 and Figure 3 , a sensor electrical socket 7 is provided at the top of the cylinder barrel 1. The displacement sensor 5 is electrically connected to the control system through the sensor electrical socket 7.

[0032] Preferably, as Figure 2 and 3 shown, with emphasis on referring to Figure 3 , the servo valve 4 further includes a valve core sleeve 403. The valve core sleeve 403 is sleeved on the valve core 402, and the valve core sleeve 403 is fixed in the valve core cavity. The valve core sleeve 403 is respectively provided with a first avoidance hole and a second avoidance hole at the positions of the first valve core hole 406 and the second valve core hole 407.

[0033] In various alternative embodiments of the above-described embodiment, preferably, as Figure 3 shown, the servo valve 4 further includes an upper end cover 404 and a lower end cover 405. The upper end cover 404 is disposed at the top of the valve core cavity, and the lower end cover 405 is disposed at the bottom of the valve core cavity.

[0034] In use, the operation of the electromagnetic oil circuit system 401 of the servo valve 4 is controlled by a control system. Specifically, both the control system and the electromagnetic oil circuit system 401 of the servo valve are prior arts and will not be elaborated herein; the spool 402 can move up and down in the spool cavity under the control of the electromagnetic oil circuit system 401. When the spool 402 moves downward to block the second spool hole 407 with the blocking portion 408, all the hydraulic oil flows into the first piston chamber from the first spool hole 406, thereby pushing the first piston 2 to move outward; similarly, when the spool 402 moves upward to block the first spool hole 406 with the blocking portion 408, all the hydraulic oil flows into the second piston chamber from the second spool hole 407, thereby pushing the second piston 3 to move outward. Since the first piston 2 is connected to the displacement sensor 5, the movement displacement and speed of the piston can be detected and then fed back to the control system to accurately regulate the servo valve 4.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An integrated structure of a hydraulic servo valve and a double-level servo hydraulic cylinder, characterized in that: It includes a cylinder barrel, a first piston, a second piston, a servo valve and a control system; it further includes a displacement sensor and a connecting piece, and the displacement sensor is electrically connected to the control system; Both ends of the cylinder barrel are respectively provided with a first piston chamber and a second piston chamber extending along the length direction of the cylinder barrel, the middle part of the cylinder barrel is provided with a spool chamber extending along the vertical direction, the spool chamber is provided with a first spool hole and a second spool hole, the spool chamber is communicated with the first piston chamber through the first spool hole, and the spool chamber is communicated with the second piston chamber through the second spool hole; The first piston is movably arranged in the first piston chamber, and the second piston is movably arranged in the second piston chamber; The servo valve includes an electromagnetic oil circuit system and a spool, the electromagnetic oil circuit system is electrically connected to the control system, the electromagnetic oil circuit system can control the movement of the spool, the middle part of the spool has a blocking part, the spool is movably arranged in the spool chamber of the cylinder barrel, and the blocking part of the spool can block the first spool hole or the second spool hole of the spool chamber; The servo valve further includes a spool sleeve, the spool sleeve is sleeved on the spool, and the spool sleeve is fixed in the spool chamber, and the spool sleeve is respectively provided with a first avoidance hole and a second avoidance hole at the positions of the first spool hole and the second spool hole.

2. The integrated structure of the hydraulic servo valve and the double-level servo hydraulic cylinder according to claim 1, characterized in that: The displacement sensor is arranged in the first piston chamber, and the displacement end of the displacement sensor is connected to the first piston through the connecting piece; Or, the displacement sensor is arranged in the second piston chamber, and the displacement end of the displacement sensor is connected to the second piston through the connecting piece.

3. The integrated structure of a hydraulic servo valve and a dual-level servo hydraulic cylinder according to claim 2, wherein: The connecting piece is a U-shaped piece, the displacement end of the displacement sensor is fixedly connected to the middle part of the U-shaped piece, and both ends of the U-shaped piece are fixedly connected to the inner-facing end of the first piston or the second piston through bolts.

4. The integrated structure of a hydraulic servo valve and a dual-level servo hydraulic cylinder according to claim 2, characterized in that: The top of the cylinder barrel is provided with a sensor electrical socket, and the displacement sensor is electrically connected to the control system through the sensor electrical socket.

5. The integrated structure of a hydraulic servo valve and a dual-level servo hydraulic cylinder according to claim 1, characterized in that: The servo valve further includes an upper end cover and a lower end cover, the upper end cover is arranged at the top of the spool chamber, and the lower end cover is arranged at the bottom of the spool chamber.

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