Integrated static pressure slide valve piston digital hydraulic servo vibration exciter

Abstract

The invention relates to the field of servo hydraulic cylinders, and discloses an integrated static pressure slide valve piston digital hydraulic servo vibration exciter which comprises a cylinder body assembly, a piston rod, a magnetic induction coil and a magnetic bar, a cylinder barrel in the cylinder body assembly, a cylinder cover and a cylinder bottom are sealed to define a first movable cavity, sealing is guaranteed, and impurity invasion and oil leakage are prevented; a clean environment is provided for piston rod movement; the piston rod penetrates through the first movable cavity and is internally provided with second and third through movable cavities, so that hydraulic oil can smoothly circulate, and the power transmission efficiency is improved; the magnetic induction coil and the magnetostrictive displacement electronic bin are integrated and then fixed to the cylinder bottom and extend into the piston rod, the integration degree is improved, and measurement interference is avoided. The magnetic rod synchronously moves along with the piston rod, one end of the magnetic rod extends into a fourth movable cavity of the magnetic induction coil, displacement measurement accuracy is guaranteed, support is provided for high-speed and high-accuracy action and closed-loop control of the vibration exciter, and comprehensive improvement of the structure, movement and control accuracy of the vibration exciter is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of servo hydraulic cylinders, in particular to an integrated static pressure slide valve piston digital hydraulic servo exciter. BACKGROUND

[0002] Servo exciters are widely used in precision manufacturing equipment, lightweight engineering machinery and other scenes, and their performance directly affects the system precision and stability. The existing exciters have two key problems: first, an external displacement sensor is used, which requires additional installation space, has low integration, is easily disturbed by vibration and oil pollution, and has insufficient measurement accuracy; second, most of them use gap sealing, which has large internal leakage, resulting in increased pressure loss and delayed action response, making it difficult to meet high-speed requirements.

[0003] The above problems are superimposed, making the exciter large in size and heavy in weight, which cannot adapt to space-sensitive scenes and is difficult to meet the needs of high-end applications for high integration, high precision, high speed and lightweight. SUMMARY

[0004] The purpose of the present application is to provide an integrated static pressure slide valve piston digital hydraulic servo exciter, which has the characteristics of compact structure, integrated digital displacement measurement and oil cylinder, and static pressure sealed slide valve, and can realize high-speed and high-precision action execution and measurement, meeting the digital servo hydraulic requirements of various highly integrated and lightweight applications.

[0005] The present application is realized by the following technical solutions: An integrated static pressure slide valve piston digital hydraulic servo exciter, comprising: A cylinder assembly comprising a cylinder barrel, a cylinder cover and a cylinder bottom, the cylinder barrel is sealed and enclosed by the cylinder cover and the cylinder bottom at both ends to form a first movable cavity; A piston rod, the piston rod is provided in the first movable cavity, can move axially along the cylinder barrel, and the inside of the piston rod is sequentially provided with a second movable cavity and a third movable cavity along the axis; A magnetic induction coil integrated with a magnetostrictive displacement electronic chamber, fixed with the cylinder bottom and axially extended into the inside of the piston rod along the second movable cavity; A magnetic rod, which moves synchronously with the piston rod, and one end of the magnetic rod passes through the third movable cavity and extends into the fourth movable cavity in the middle of the magnetic induction coil.

[0006] In the present scheme, the first movable cavity is formed by sealing the cylinder cover and the cylinder bottom in the cylinder assembly, which can effectively guarantee the sealing performance of the hydraulic cavity, avoid the intrusion of external impurities and the leakage of internal hydraulic oil, and provide a closed and clean working environment for the stable movement of the piston rod; the piston rod is arranged in the first movable cavity and can move axially along the cylinder barrel, and the second movable cavity and the third movable cavity, which are arranged in the piston rod along the axis in sequence and are in communication with each other, can realize smooth flow of hydraulic oil in the piston rod, ensure that hydraulic energy can be efficiently converted into axial driving force of the piston rod, reduce pressure loss caused by oil retention, and improve the power transmission efficiency of the exciter.

[0007] In some other schemes, the magnetic induction coil and the magneto-displacement electronic warehouse are an integrated structure that cannot be disassembled, and the integrated structure is fixed through the center mounting position of the cylinder bottom, so that the magnetic induction coil, the magneto-displacement electronic warehouse and the cylinder bottom form an integrated assembly. The integrated assembly can completely integrate the magnetic induction coil and the magneto-displacement electronic warehouse into the space enclosed by the cylinder bottom and the piston rod, without the need for additional external installation space or independent fixing brackets for the two, which significantly reduces the number of parts and external extension structures of the exciter, effectively reduces the volume and weight of the exciter, and improves the structural integration and lightweight level.

[0008] In some other schemes, the center of the cylinder bottom is provided with a threaded mounting hole, and the integrated structure of the magnetic induction coil and the magneto-displacement electronic warehouse is sealed and fixed through the threaded mounting hole, so that the magnetic induction coil forms a sealed integration with the cylinder bottom when extending axially into the piston rod along the second movable cavity. This not only prevents external pollutants from entering the cylinder interior and affecting the magnetic induction coil, but also further simplifies the overall structure of the exciter, reduces the number of parts, and helps to improve the integration and lightweight level of the exciter, which is more suitable for servo hydraulic application scenarios with high requirements for sealing, structural compactness and measurement accuracy.

[0009] In other schemes, the outer end of the piston rod is connected with a replaceable connector through threads, which can be quickly replaced according to the connection requirements of different external loads, and the fixed end of the magnetic rod is connected with the end of the replaceable connector, so that the magnetic rod can be installed and replaced synchronously with the disassembly and assembly of the replaceable connector. This not only simplifies the assembly process of the magnetic rod and avoids the cumbersome operation of separately disassembling the traditional magnetic rod from the inside of the piston rod, but also ensures the coaxiality between the magnetic rod and the piston rod through the threaded positioning of the replaceable connector and the piston rod, thereby reducing the displacement measurement error caused by the installation offset of the magnetic rod.

[0010] In other schemes, the magnetic rod and the piston rod are coaxial integrated fixed structures, and the magnetic rod is limited and fixed by the inner wall of the third movable cavity to avoid the relative offset of the magnetic rod and the piston rod caused by assembly gap, vibration and other factors in the traditional split installation, thereby ensuring the position of the magnetic rod extending into the magnetic induction coil to be always accurate, reducing the signal deviation in the displacement measurement process, and significantly improving the precision and stability of digital displacement measurement. In addition, the magnetic rod and the piston rod form a compact integrated structure, avoiding the occupation of the internal space of the cylinder by excess components, and further helping to improve the overall integration and lightweight level of the exciter.

[0011] In other schemes, a plurality of static pressure grooves are arranged between the cylinder cover and the outer side wall of the piston rod, between the cylinder barrel and the outer side wall of the piston rod, and between the outer side wall of the magnetic induction coil and the outer side wall of the piston rod, and each static pressure groove is in communication with the first movable cavity. The static pressure grooves are filled with high-pressure oil to form a sealed oil film. Compared with the traditional gap sealing or single contact sealing, the non-contact sealing structure formed by the high-pressure oil film can greatly reduce the friction resistance between the components, reduce the wear of the components caused by friction, prolong the service life of the exciter, effectively inhibit the leakage of hydraulic oil, avoid the system pressure loss caused by leakage, and ensure the stability and response speed of the power output of the exciter, thereby meeting the demand for high-speed operation.

[0012] In other schemes, oil inlet holes A and B are respectively formed in the cylinder barrel, the oil inlet hole A is in communication with the first movable cavity, and the oil inlet hole B is in communication with the second movable cavity. The oil supply pressure and flow of the oil inlet holes A and B can be flexibly adjusted according to actual working requirements, which can adapt to the demand for the movement precision and power of the piston rod in different load scenarios, and further improve the application range and control flexibility of the exciter.

[0013] In other schemes, the cylinder head is provided with a pressure relief hole communicating with the first movable cavity, and the cylinder barrel is provided with a circulation hole communicating with the second movable cavity, and the circulation hole communicates with the pressure relief hole, and the communication between the circulation hole and the pressure relief hole forms an integrated oil return channel, without the need to separately provide a return pipeline for the two cavities, thereby simplifying the internal oil circuit structure of the exciter and reducing the leakage risk and assembly complexity caused by pipeline connection.

[0014] In other schemes, a first O-shaped sealing ring is arranged at the connection between the circulation hole and the pressure relief hole, so as to effectively block the gap that may exist when the two holes communicate, thereby avoiding leakage of hydraulic oil from the connection during the circulation and return process, and a second O-shaped sealing ring is arranged at the connection between the magnetic induction coil and the cylinder bottom, so as to avoid the entry of external dust and impurities into the cylinder body to pollute the oil or wear the moving parts.

[0015] In other schemes, the signal output end of the magnetic displacement electronic warehouse is integrated on the outer wall of the cylinder bottom to form an integrated signal interface, and the signal interface directly communicates with the internal circuit of the magnetic displacement electronic warehouse, so that the signal output structure is completely integrated into the cylinder assembly, without the need to additionally occupy installation space, thereby further simplifying the overall structure of the exciter.

[0016] Compared with the prior art, the present application has the following advantages and beneficial effects: 1. The magnetic induction coil and the magnetic displacement electronic warehouse are integrated and fixed to the cylinder bottom and extend into the inside of the piston rod, the magnetic rod is coaxially integrated and fixed with the piston rod, the signal output end is integrated on the outer wall of the cylinder bottom to form an integrated interface, and the oil inlet hole is integrally formed in the cylinder barrel and the integrated detachable connection part is arranged on the cylinder head, thereby eliminating the need for additional installation supports, adapter parts and external lines, greatly reducing the number of parts and external extension structures, reducing the overall volume and weight of the exciter, significantly improving the integration degree, and adapting to small-sized automatic equipment, vehicle-mounted hydraulic modules and other scenes sensitive to installation space, thereby solving the problem of loose structure and difficulty in lightweight of traditional products. 2. The built-in design of synchronous movement of the magnetic rod and the piston rod, integrated coil and electronic warehouse eliminates the influence of external environmental interference and assembly gap, ensures the synchronization and accuracy of displacement signal acquisition and processing, greatly improves the measurement accuracy, provides reliable data support for high-speed and high-precision action control of the exciter, and avoids the control deviation caused by signal loss and delay in the traditional measurement method. 3. The application is provided with a static pressure groove on the key matching surface of the cylinder cover and the piston rod, the cylinder barrel and the piston rod, and the magnetic induction coil and the piston rod, and a full-area non-contact sealing oil film is formed by high-pressure oil communicated with the first movable cavity, which not only greatly reduces the internal leakage and pressure loss, but also reduces the friction and wear between parts, prolongs the service life, and at the same time, the communication design of the circulating hole and the pressure relief hole and the O-shaped sealing ring at the key position are matched to realize the ordered circulation and pressure balance of the oil, avoid the action jam caused by pressure fluctuation and bubble disturbance, and significantly improve the action response speed and running stability of the exciter. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings described herein are used to provide further understanding of the embodiments of the application, constitute a part of this application, and do not constitute a limitation on the embodiments of the application. In the drawings: Figure 1 It is a structural schematic diagram of the application.

[0018] Markings in the drawings and corresponding names of parts: 1 - replaceable connector, 2 - cylinder cover, 3 - cylinder barrel, 31 - first movable cavity, 32 - circulating hole, 33 - first O-shaped sealing ring, 4 - oil inlet hole A, 5 - oil inlet hole B, 6 - pressure relief hole, 7 - piston rod, 71 - second movable cavity, 72 - third movable cavity, 8 - magnetic rod, 9 - magnetic induction coil, 91 - fourth movable cavity, 92 - second O-shaped sealing ring, 10 - cylinder bottom, 11 - magnetic displacement electronic bin, 12 - static pressure groove. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the application more clear and obvious, the application is further described in detail below in combination with examples and drawings. The illustrative embodiments of the application and their descriptions are only used to explain the application, and do not limit the application.

[0020] Example 1 This embodiment 1 provides a one-piece static pressure slide valve piston digital hydraulic servo exciter, which adopts multi-module integrated design, as shown in Figure 1 The magnetic induction coil 9 and the magnetic rod 8 are included. The cylinder assembly is the basic load bearing and hydraulic chamber structure of the exciter, including a cylinder barrel 3, a cylinder cover 2 and a cylinder bottom 10. The cylinder barrel 3 is a hollow cylindrical structure and is the core cavity for storing and transmitting hydraulic oil. The two ends of the cylinder barrel 3 are respectively sealed and enclosed with the cylinder cover 2 and the cylinder bottom 10 to form a first movable cavity 31. A piston rod 4 is arranged in the first movable cavity 31 and can move axially along the cylinder barrel 3. The inside of the piston rod 7 is sequentially provided with a second movable cavity 71 and a third movable cavity 72 which are mutually penetrated. A magnetic induction coil 9 and a magnetic displacement electronic bin 11 are integrated and fixed with the cylinder bottom 10 and axially extend into the inside of the piston rod 7 along the second movable cavity 71. A magnetic rod 8 moves synchronously with the piston rod 7. One end of the magnetic rod 8 penetrates through the third movable cavity 72 and extends into a fourth movable cavity 91 in the middle of the magnetic induction coil 9. This integrated design not only saves the additional installation space and fixing structure of the traditional external displacement sensor, but also greatly improves the overall integration of the exciter.

[0021] Specifically, as shown in Figure 1 , the inside of the cylinder barrel 3 is processed with the first movable cavity 31 for accommodating the piston rod 7 and providing guidance for the axial movement of the piston rod 7. The oil inlet hole A4 and the oil inlet hole B5 are integrally formed on the outer wall of the cylinder barrel 3. Both of them are standard interfaces and can be directly adapted to various servo valves. The oil inlet hole A4 communicates with the first movable cavity 31 and the oil inlet hole B5 communicates with the second movable cavity 71 of the piston rod 7, respectively providing different direction hydraulic power for the movement of the piston rod 7. The cylinder barrel 3 is also provided with a circulation hole 32 and the cylinder cover 2 is provided with a pressure relief hole 6. The circulation hole 32 communicates with the second movable cavity 71 and the pressure relief hole 6, and the pressure relief hole 6 communicates with the first movable cavity 31, thereby forming an oil circulation and pressure relief channel for discharging excess oil in the movable cavity 31 and balancing the chamber pressure. Therefore, the same pressure relief channel is used in this embodiment to simplify the internal oil circuit structure of the exciter.

[0022] Specifically, as shown in Figure 1 , the cylinder cover 2 is a disc-shaped structure and is fixed to one end of the cylinder barrel 3 by bolts. A through hole is formed in the center of the cylinder cover 2 for the piston rod 7 to pass through. A static pressure groove 12 is processed on the inner wall of the through hole. A standardized replaceable connector 1 is arranged at the end of the cylinder cover 2 away from the cylinder barrel 3. The connector is connected in a threaded manner and can be quickly replaced and adapted according to the type of external load without modifying the structure of the cylinder cover.

[0023] Specifically, as shown in Figure 1As shown, the cylinder bottom 10 is a disc-shaped structure, fixed to the end of the cylinder barrel 3 away from the cylinder cover 2, with a threaded mounting hole in the center for sealing and fixing the integrated digital displacement measurement module magnetic displacement electronic chamber 11, and a first O-shaped sealing ring 33 is arranged at the connection between the circulation hole 32 and the pressure relief hole 6 to prevent hydraulic oil from leaking from the connection during circulation and backflow. A second O-shaped sealing ring 92 is arranged at the connection between the magnetic induction coil 9 and the cylinder bottom 10 to prevent external dust and impurities from entering the cylinder body and polluting the oil or wearing the moving parts. The first O-shaped sealing ring 33 and the second O-shaped sealing ring 92 are both made of butyronitrile rubber, which can effectively seal the gap between the components, prevent hydraulic oil leakage and external impurities from entering, and ensure the sealing performance of the cylinder body.

[0024] In this embodiment, as shown in Figure 1 The piston rod 7 is a stepped cylindrical structure, arranged in the first movable cavity 31 of the cylinder barrel 3 and can reciprocate axially along the cylinder barrel 3. One end of the piston rod 7 extends out of the through hole of the cylinder cover 2 and is connected to an external load for outputting axial driving force. A second movable cavity 71 and a third movable cavity 72 are machined in the piston rod 7 along the axis and are in communication with each other. The second movable cavity 71 is close to the cylinder bottom 10 and is used to accommodate the magnetic induction coil 9 of the integrated digital displacement measurement module. The third movable cavity 72 is close to the cylinder cover 2 and is used to fix the magnetic rod 8. The piston outer circular wall of the piston rod 7 (i.e. the cylindrical surface matched with the inner wall of the first movable cavity 31) is machined with a static pressure groove 12, which forms a sealed oil film with the static pressure groove 12 of the cylinder cover 2 and the magnetic induction coil 9. In this embodiment, the static pressure groove 12 is a rectangular cross-section annular groove, which is machined on the inner hole wall of the cylinder cover 2, the piston outer circular wall of the piston rod 7, and the outer circular wall of the magnetic induction coil 9. Each group of static pressure grooves 12 is uniformly distributed by 3-4 in the circumferential direction. All the static pressure grooves 12 can obtain high-pressure hydraulic oil from the movable cavity, form a uniform sealed oil film between the matching surfaces, and realize non-contact sealing.

[0025] As shown in Figure 1 The magnetic rod 8 is a cylindrical structure made of permanent magnetic material, which is fixed in the third movable cavity 72 of the piston rod 7 by interference fit, forms a coaxial integrated fixed structure with the piston rod 7, has no relative displacement, and can move axially synchronously with the piston rod 7. In other embodiments, the fixed end of the magnetic rod 8 can also be connected with the end of the replaceable connector 1 to form a whole with the replaceable connector 1. The other end of the magnetic rod 8 penetrates through the third movable cavity 72 and extends into the fourth movable cavity 91 in the middle of the magnetic induction coil 9 to provide a magnetic signal source for displacement measurement by magnetic flux change, ensuring that the magnetic induction coil 9 can accurately capture the displacement change of the piston rod 7.

[0026] The magnetic induction coil 9 is a cylindrical coil structure wound by copper enameled wire, and is integrally formed with the magnetic displacement electronic bin 11 by epoxy resin pouring, and the outer cylindrical wall is processed with a static pressure groove 12 matched with the inner wall of the second movable cavity 71 of the piston rod 7. The magnetic induction coil 9 is connected to the inside of the piston rod 7 in the axial direction of the second movable cavity 71 through the threaded sealing connection of the cylinder bottom 10, and the fourth movable cavity 91 formed in the coil is used for the extension of the magnetic rod 8. During operation, the magnetic rod 8 moves with the piston rod 7, which causes the magnetic flux in the magnetic induction coil 9 to change, and the coil generates an induced electromotive force. The magnetic displacement electronic bin 11 receives the induced electromotive force signal output by the magnetic induction coil 9, and after amplification, filtering and A / D conversion, it is converted into a digital displacement signal and transmitted to the external control system, realizing the digitization of displacement measurement.

[0027] Working principle: During operation, the servo valve supplies oil to the first movable cavity 31 through the oil inlet hole A4, and discharges hydraulic oil in the second movable cavity 71 through the oil inlet hole B5. When working in the opposite direction, the direction of the oil inlet and outlet holes is changed, so that the pressure difference between the two chambers can drive the piston rod 7 to reciprocate along the cylinder barrel 3. At the same time, the high-pressure oil in the movable cavity enters each group of static pressure grooves 12 to form a sealed oil film, reducing the friction between the piston rod 7 and the cylinder cover 2, the magnetic induction coil 9 and the piston rod 7, and the piston cylinder 7 and the cylinder barrel 3. The magnetic rod 8 moves synchronously with the piston rod 7, causing the magnetic flux in the magnetic induction coil 9 to change, and the coil generates an induced electromotive force. The magnetic displacement electronic bin 11 converts the induced electromotive force signal into a digital displacement signal and transmits it to the external control system, realizing real-time monitoring of displacement. At the same time, the excess oil in the static pressure groove 12 is discharged through the pressure relief hole 6 to ensure stable operation of the exciter, and finally realizes high-speed and high-precision action execution and measurement.

[0028] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A digital hydraulic servo vibrator with an integrated hydrostatic slide valve piston, characterized in that, include: The cylinder assembly includes a cylinder barrel (3), a cylinder head (2) and a cylinder bottom (10), wherein the two ends of the cylinder barrel (3) are respectively sealed and enclosed with the cylinder head (2) and the cylinder bottom (10) to form a first movable cavity (31); The piston rod (7) passes through the first movable cavity (31) and can move along the cylinder (3) axially. The piston rod (7) has a second movable cavity (71) and a third movable cavity (72) that are interconnected along the axis. After the magnetic induction coil (9) is integrated with the magnetostrictive electronic chamber (11), it is fixed to the cylinder bottom (10) and extends into the piston rod (7) along the second active cavity (71); The magnetic rod (8) moves synchronously with the piston rod (7), and one end of the magnetic rod (8) passes through the third active cavity (72) and extends into the fourth active cavity (91) in the middle of the magnetic induction coil (9).

2. The integrated hydrostatic slide valve piston digital hydraulic servo exciter according to claim 1, characterized in that, The magnetic induction coil (9) and the magnetostrictive electronic compartment (11) are an inseparable integrated structure, and the integrated structure is fixed by the central mounting position of the cylinder bottom (10), so that the magnetic induction coil (9), the magnetostrictive electronic compartment (11) and the cylinder bottom (10) form an integrated assembly.

3. The integrated hydrostatic slide valve piston digital hydraulic servo exciter according to claim 2, characterized in that, The cylinder bottom (10) has a threaded mounting hole at its center. The integrated structure of the magnetic induction coil (9) and the magnetostrictive electronic chamber (11) is sealed and fixed through the threaded mounting hole, so that when the magnetic induction coil (9) extends into the piston rod (7) along the second active cavity (71) axially, it forms a sealed integration with the cylinder bottom (10).

4. The integrated hydrostatic slide valve piston digital hydraulic servo exciter according to claim 1, characterized in that, The outer end of the piston rod (7) is connected to a replaceable connector (1) by a thread, and the fixed end of the magnetic rod (8) is connected to the end of the replaceable connector (1).

5. The integrated hydrostatic slide valve piston digital hydraulic servo exciter according to claim 1, characterized in that, The magnetic rod (8) and the piston rod (7) are coaxially integrated fixed structures. The magnetic rod (8) is limited and fixed by the inner wall of the third movable cavity (72), so that the magnetic rod (8) and the piston rod (7) have no relative displacement and achieve synchronous axial movement.

6. The integrated hydrostatic slide valve piston digital hydraulic servo exciter according to claim 1, characterized in that, Multiple static pressure grooves (12) are provided at intervals between the cylinder head (2) and the outer wall of the piston rod (7), between the cylinder barrel (3) and the outer wall of the piston rod (7), and between the outer wall of the magnetic induction coil (9) and the outer wall of the piston rod (7). Each static pressure groove (12) is connected to the first active cavity (31). The static pressure groove (12) is filled with high-pressure oil to form a sealing oil film.

7. The integrated hydrostatic slide valve piston digital hydraulic servo exciter according to claim 6, characterized in that, The cylinder (3) is provided with an oil inlet hole A (4) and an oil inlet hole B (5). The oil inlet hole A (4) is connected to the first movable cavity (31), and the oil inlet hole B (5) is connected to the second movable cavity (71).

8. The integrated hydrostatic slide valve piston digital hydraulic servo exciter according to claim 7, characterized in that, The cylinder head (2) has a pressure relief hole (6) that connects to the first active chamber (31), and the cylinder (3) has a circulation hole (32) that connects to the second active chamber (71). The circulation hole (32) is connected to the pressure relief hole (6).

9. The integrated hydrostatic slide valve piston digital hydraulic servo exciter according to claim 8, characterized in that, A first O-ring (33) is provided at the connection between the circulation hole (32) and the pressure relief hole (6), and a second O-ring (92) is provided at the connection between the magnetic induction coil (9) and the cylinder bottom (10).

10. The integrated hydrostatic slide valve piston digital hydraulic servo exciter according to claim 1, characterized in that, The signal output terminal of the magnetostrictive electronic chamber (11) is integrated on the outer wall of the cylinder bottom (10) to form an integrated signal interface, which is directly connected to the internal circuit of the magnetostrictive electronic chamber (11).

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