A metering drive device for a valve pair

Abstract

The present invention relates to a metering drive device for a valve pair, comprising a platform, with a servo motor and a test fixture mounted on either side of the platform. The servo motor drives a ball screw, with linear guides disposed parallel to the ball screw on either side. The linear guides are slidably connected to guide rail sliders, a horizontal slide is fixedly connected to a screw seat on the ball screw and the guide rail sliders, the horizontal slide is connected to the valve pair via a connecting assembly, the valve pair is mounted in the test fixture, and a measuring mechanism is disposed between the connecting assembly and the platform. The valve pair includes a valve and a bushing, and the test fixture is provided with a first oil chamber and a second oil chamber. The present invention drives the valve to achieve linear motion through a position control system composed of a servo motor, a ball screw, a spherical bearing, a connecting rod, an adjustment block, and the like. The axial and vertical position of the device can be adjusted by adjusting or replacing the adjustment block, thereby facilitating device installation and reducing eccentricity of the tested valve.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic system testing and relates to a metering drive device for a valve pair. Background Art

[0002] Metering valve pairs are flow control elements and are widely used in the automotive, metallurgy, medicine, engineering machinery, aerospace and other fields to accurately measure the flow of hydraulic systems.

[0003] A metering valve assembly typically consists of a valve, a bushing, and a sealing ring. The bushing features a specifically shaped orifice, tailored to the flow characteristics of the hydraulic system. When the metering valve assembly is in operation, the orifice's opening is controlled by adjusting the valve position, while maintaining a constant pressure differential between the valve's inlet and outlet. This accurately measures the flow of media passing through the valve.

[0004] At present, domestic research on the flow performance of metering valve pairs generally adopts simulation analysis and subsystem-level testing methods. In the field of aircraft engine hydraulic component testing, there is currently no component-level metering valve pair performance testing equipment. Summary of the Invention

[0005] The purpose of the present invention is to provide a metering drive device for a valve pair, which can solve the problem that there is no component-level metering valve pair performance testing device in the field of aircraft engine hydraulic component testing.

[0006] According to the technical solution provided by the present invention: a metering drive device for a valve pair, including a platform, a servo motor and a test fixture are respectively installed on the left and right sides of the platform, the servo motor drives a ball screw, and linear guide rails are parallelly provided on both sides of the ball screw, and the linear guide rails are slidingly connected to the guide rail sliders, the horizontal slide is fixedly connected to the screw seat on the ball screw and the guide rail sliders, the horizontal slide is connected to the valve pair through a connecting component, the valve pair is installed in the test fixture, and a measuring mechanism is provided between the connecting component and the platform; the valve pair includes a valve and a bushing; a first oil chamber and a second oil chamber are provided in the test fixture, the first oil chamber and the second oil chamber are connected through a main channel and a secondary channel, the main channel is connected to the oil outlet, the first oil chamber is connected to the oil inlet, the bushing is installed in the main channel, a radially through-hole is provided on the bushing, the main channel and the oil outlet are located on the inner and outer sides of the bushing, the valve is slidably installed in the bushing, and the first oil chamber and the second oil chamber are located on the left and right sides of the valve.

[0007] As a further improvement of the present invention, a ball screw is rotatably mounted on the middle portion of the platform through a bearing seat, and the output shaft of the servo motor is connected to one end of the ball screw through a coupling.

[0008] As a further improvement of the present invention, the connecting assembly includes a first connecting rod, a joint bearing, and a second connecting rod connected in sequence, one end of the first connecting rod is connected to the top of the horizontal slide; one end of the second connecting rod extends into the test fixture and is threadedly connected to the valve.

[0009] As a further improvement of the present invention, the horizontal slide is fixed to the screw seat and the guide rail slider by means of bolts.

[0010] As a further improvement of the present invention, the first connecting rod is connected to the horizontal slide through an adjustment block, and the adjustment block is provided with a long waist-shaped hole and is fixed to the horizontal slide by bolts.

[0011] As a further improvement of the present invention, one end of the bushing is against the inner wall of the test fixture, and the other end is against the pressure block, the pressure block is threadedly installed in the fixture, and a spacer is placed between the bushing and the pressure block.

[0012] As a further improvement of the present invention, the measuring mechanism includes a reading head and a grating scale arranged upper and lower. The reading head is fixed to the bottom of the second connecting rod through a clamping member. The grating scale is tightly attached to the upper part of the mounting plate along the axial position direction of the valve. The upper part of the mounting plate is located above the linear guide rail.

[0013] As a further improvement of the present invention, a limit mechanism is installed on the side of the linear guide rail, and the limit mechanism includes a limit touch plate and a limit guide rail. The limit touch plate is fixedly connected to the lower part of the horizontal slide, and the limit guide rail is located on the outside of the linear guide rail. The left limit switch and the right limit switch are slidably installed on the limit guide rail. The left limit switch and the right limit switch are located on both sides of the limit touch plate. The left limit switch and the right limit switch are provided with tightening bolts.

[0014] As a further improvement of the present invention, the reading head, the grating ruler, the left limit switch, and the right limit switch are connected to a servo controller via a measuring module, and the servo controller controls the servo motor.

[0015] As a further improvement of the present invention, the bearing seat and the ball screw are installed on the tooling frame; the linear guide rail is fixed to the tooling frame by bolts, and the limit guide rail is fixed to the side of the tooling frame; the servo motor, mounting plate, tooling frame, and test tooling are fixed to the platform by bolts.

[0016] The positive progress of this application is:

[0017] 1. The present invention drives the valve to achieve linear motion through a position control system composed of a servo motor, a ball screw, a spherical bearing, a connecting rod, an adjustment block, etc. The axial and vertical position of the device can be adjusted by adjusting or replacing the adjustment block, which facilitates the installation of the device and reduces the eccentricity of the test valve.

[0018] 2. When the valve of the present invention moves linearly, the connection between the linear drive module and the valve is designed with a joint bearing, which can withstand radial loads and axial loads at the same time, and can perform tilting motion within a certain angle range (i.e., rotational motion around the X, Y, and Z axes), reducing eccentric wear or jamming of the valve caused by eccentricity.

[0019] 3. The present invention uses a high-performance servo motor as the actuator of the valve position control system and a high-precision grating ruler as the measuring element of the valve displacement. High-precision control of the valve displacement can be achieved through closed-loop control.

[0020] 4. The design of the test cylinder of the present invention takes into account the communication of the oil chambers before and after the valve, ensuring that the pressure at both ends of the valve is consistent, and avoiding excessive hydraulic pressure applied to the connecting rod, which may cause the valve position control system to become unstable or damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of the present invention.

[0022] Figure 2 It is a top view of the present invention.

[0023] Figure 3 This is a schematic diagram of the connection of the coupling, bearing seat, ball screw, screw seat, guide rail slider, and linear guide rail of the present invention.

[0024] Figure 4 It is a cross-sectional view of the test tool of the present invention.

[0025] Figures 1-4 The test fixture includes a servo motor 1, a servo controller 2, a measuring module 3, a reading head 4, a grating ruler 5, a valve 6, a bushing 7, a mounting plate 8, a fixture frame 9, a limit guide rail 10, a left limit switch 11, a limit touch plate 12, a right limit switch 13, a platform 14, a horizontal slide 15, an adjustment block 16, a first connecting rod 17, a spherical bearing 18, a second connecting rod 19, a test fixture 20, a coupling 21, a bearing seat 22, a ball screw 23, a screw seat 24, a guide rail slider 25, a linear guide rail 26, etc. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate for the embodiments of the present invention described herein. In addition, similar terms such as "including" and "having" mean that in addition to those contents already listed in "including" and "having", other contents that have not been listed may also be "included" and "having"; for example, a process, method, system, product or device that may include a series of steps or units is not necessarily limited to those steps or units that have been clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Due to the angle of the drawing, some components may not be drawn, but their positions and connection relationships can be partially understood based on the text.

[0030] like Figure 1-Figure 3 As shown, the present invention is a metering drive device for a valve pair, comprising a platform 14, with a servo motor 1 and a test fixture 20 installed on the left and right sides of the platform 14 respectively, the servo motor 1 drives a ball screw 23, and linear guide rails 26 are provided in parallel on both sides of the ball screw 23, and a guide rail slider 25 is slidably connected on the linear guide rail 26, the horizontal slide 15 is fixedly connected to the screw seat 24 on the ball screw 23 and the guide rail slider 25, the horizontal slide 15 is connected to the valve pair through a connecting component, the valve pair is installed in the test fixture 20, and a measuring mechanism is provided between the connecting component and the platform 14.

[0031] Specifically, a ball screw 23 is rotatably mounted in the middle of the platform 14 through a bearing seat 22 , and the output shaft of the servo motor 1 is connected to one end of the ball screw 23 through a coupling 21 . The ball screw 23 converts the rotational displacement of the servo motor 1 into linear displacement.

[0032] The horizontal slide 15 is fixed by bolts, screw seats 24 and guide rail sliders 25. The ball screw 23 transmits linear displacement to the horizontal slide 15 via the screw seats 24, and the guide rail sliders 25 ensure that the horizontal slide 15 can move smoothly.

[0033] The connecting assembly includes a first connecting rod 17, a spherical bearing 18, and a second connecting rod 19, which are connected in sequence. One end of the first connecting rod 17 is connected to the top of the horizontal slide 15, and one end of the second connecting rod 19 is connected to the valve assembly. The rotational freedom of the spherical bearing 18 absorbs coaxial deviations between the first connecting rod 17 at the drive end and the second connecting rod 19 at the valve end, reducing the risk of the valve assembly getting stuck during movement.

[0034] In order to adapt to the installation and positioning requirements of valve pairs of different structural sizes, the first connecting rod 17 is connected to the horizontal slide 15 through the adjustment block 16. The adjustment block 16 is provided with a long waist-shaped hole and is fixed to the horizontal slide 15 by bolt connection, and can be adjusted along the axial direction of the valve.

[0035] The valve couple includes a valve 6 and a bushing 7. Figure 4 As shown, the test fixture 20 is provided with a first oil chamber 29 and a second oil chamber 33. The first oil chamber 29 and the second oil chamber 33 are connected through a main channel and a secondary channel. The main channel is connected to the oil outlet 27, and the first oil chamber 29 is connected to the oil inlet 28. The bushing 7 is installed in the main channel. The main channel and the oil outlet 27 are located on the inner and outer sides of the bushing 7. The valve 6 is slidably installed in the bushing 7. The first oil chamber 29 and the second oil chamber 33 are located on the left and right sides of the valve 6. One end of the second connecting rod 19 extends into the test fixture 20 and is threadedly connected to the valve 6.

[0036] A shaped hole is radially penetrated on the bushing 7. The valve 6 moves axially relative to the bushing 7 to change the area of the shaped hole of the bushing 7. The oil in the first oil chamber 29 flows into the oil outlet 27 through the shaped hole of the bushing 7. The change in the area of the shaped hole of the bushing 7 can adjust the valve flow.

[0037] One end of the bushing 7 is against the inner wall of the test fixture 20, and the other end is against the pressing block 31, which is threadedly installed in the fixture 20. In order to protect the bushing 7, a spacer 32 is placed between the bushing 7 and the pressing block 31.

[0038] The secondary channel ensures consistent pressure across the front and rear ends of valve 6, preventing excessive hydraulic pressure from being applied to second connecting rod 19, which could cause instability or damage to the metering drive mechanism of the valve assembly. The secondary channel consists of a first oil hole 30 and a second oil hole 34, which are interconnected. The first oil hole 30 communicates with the first oil chamber 29, and the second oil hole 34 communicates with the second oil chamber 33.

[0039] A sealing ring is provided between the second connecting rod 19 and the test fixture 20 to ensure that the oil does not leak.

[0040] The measuring mechanism uses a grating measuring element to measure the linear displacement of the valve. It includes a readhead 4 and a grating scale 5, which are arranged vertically. The readhead 4 is fixed to the bottom of the second connecting rod 19 by a clamp. The grating scale 5 is affixed to the upper portion of the mounting plate 8 along the axial direction of the valve. The upper portion of the mounting plate 8 is located above the linear guide 26. The grating scale 5 is a self-adhesive type.

[0041] To limit the sliding travel of the valve 6, a limit mechanism is installed on the side of the linear guide 26. The limit mechanism includes a limit touch plate 12 and a limit guide 10. The limit touch plate 12 is fixedly connected to the lower portion of the horizontal slide 15 and moves along the axial direction of the valve. The limit guide 10 is located outside the linear guide 26. The left limit switch 11 and the right limit switch 13 are slidably mounted on the limit guide 10. The left limit switch 11 and the right limit switch 13 are located on either side of the limit touch plate 12. The left limit switch 11 and the right limit switch 13 are equipped with support bolts.

[0042] The reading head 4 , the grating ruler 5 , the left limit switch 11 , and the right limit switch 13 are connected to the servo controller 2 through the measuring module 3 , and the servo controller 2 controls the servo motor 1 .

[0043] The measurement module 3 consists of an analog acquisition board and a digital acquisition board. It collects the analog signal output by the grating ruler 5 sensor and the digital signals output by the left limit switch 11 and the right limit switch 13, respectively, and inputs the collected signals into the servo controller 2. The servo controller 2 performs calculations and logical judgments based on the collected signals to control the movement of the servo motor 1.

[0044] The left and right limit switches 11, 13 are fixed to the limit rail 10 via support bolts and can be adjusted left or right along the limit rail 10 to adjust the axial displacement limit of the valve 6. When the limit contact plate 12 approaches the left or right limit switch 11, 13, the emergency stop logic of the servo controller 2 is triggered, causing the servo controller 2 to sound an alarm and stop the servo motor 1.

[0045] The reading head 4, grating ruler 5, left limit switch 11, limit touch plate 12, and right limit switch 13 are used to measure the position of the valve 6 in real time and feed the measurement results back to the servo controller 2 to achieve high-precision position closed-loop control.

[0046] To ensure that the output shaft of the servo motor 1 and the ball screw 23 are coplanar, the bearing seat 22 and ball screw 23 are mounted on the fixture frame 9. The fixture frame 9 is designed as a U-shaped structure, with the coupling 21, bearing seat 22, and ball screw 23 installed in the grooves of the fixture frame 9. The linear guide 26 is fixed to the fixture frame 9 by bolts, and the limit guide 10 is fixed to the side of the fixture frame 9.

[0047] The servo motor 1 , the mounting plate 8 , the fixture frame 9 , and the test fixture 20 are fixed on the platform 14 by bolt connection.

[0048] The high-performance servo motor 1 and servo controller 2 enable precise forward and reverse rotation control within a 1 / 360,000th of a revolution, providing a maximum driving force of 400N for valve movement. The ball screw 23, with a 5mm lead, achieves position actuation within a 0.014μm range of 5 / 360,000mm. The grating scale 5, a measuring element, achieves a measurement accuracy of 0.1μm. The motor, controller, ball screw, and measuring element all maintain an accuracy of less than 0.1μm. Through closed-loop control, high-precision control of the valve position within 1μm is guaranteed, enabling adjustable flow area of the bushing orifice from 0% to 100%.

[0049] The metering drive device of the valve pair cooperates with other equipment such as the medium environment simulation system and the measurement and control system to carry out the flow performance test of the valve pair. The valve and the bushing are combined together and installed in the test fixture. The medium environment simulation system simulates the pressure difference and temperature at both ends of the valve. The metering drive device of the valve pair drives the valve to move axially relative to the bushing, changing the bushing hole area, thereby adjusting the valve flow. The measurement and control system collects performance test data such as valve flow, pressure at both ends of the valve, temperature, and valve displacement.

[0050] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A metering drive device for a valve pair, characterized in that: The invention comprises a platform (14), a servo motor (1) and a test fixture (20) are respectively installed on the left and right sides of the platform (14), the servo motor (1) drives a ball screw (23), and linear guide rails (26) are provided on both sides of the ball screw (23) in parallel, and a guide rail slider (25) is slidably connected on the linear guide rail (26), and the horizontal slide (15) is fixedly connected to the screw seat (24) on the ball screw (23) and the guide rail slider (25), and the horizontal slide (15) is connected to the valve pair through a connecting component, and the valve pair is installed in the test fixture (20), and a measuring mechanism is provided between the connecting component and the platform (14); the valve pair includes a valve (6) and a bushing (7); a first oil chamber ( 29) and the second oil chamber (33), the first oil chamber (29) and the second oil chamber (33) are connected through a main channel and a secondary channel, the main channel is connected to the oil outlet (27), the first oil chamber (29) is connected to the oil inlet (28), the bushing (7) is installed in the main channel, the bushing (7) is provided with a radial hole, the main channel and the oil outlet (27) are located on the inside and outside of the bushing (7), the valve (6) is slidably installed in the bushing (7), the first oil chamber (29) and the second oil chamber (33) are located on the left and right sides of the valve (6); the connecting assembly includes a first connecting rod (17), a joint bearing (18), and a second connecting rod (19) connected in sequence, one end of the first connecting rod (17) is connected to the top of the horizontal slide (15); the second connecting rod (19) is connected to the first connecting rod (17) and the second connecting rod (19) One end of the rod (19) extends into the test fixture (20) and is threadedly connected to the valve (6); the horizontal slide (15) is fixed to the screw seat (24) and the guide rail slider (25) by bolts; the first connecting rod (17) is connected to the horizontal slide (15) through the adjustment block (16), and the adjustment block (16) is provided with a long waist-shaped hole and is fixed to the horizontal slide (15) by bolt connection; one end of the bushing (7) is against the inner wall of the test fixture (20), and the other end is against the pressure block (31), and the pressure block (31) is threadedly installed in the test fixture (20), and a pad (32) is placed between the bushing (7) and the pressure block (31); the measuring mechanism includes a reading head (4) and a grating scale (5) arranged above and below, and the reading head (4) is fixed by a clamping member At the bottom of the second connecting rod (19), the grating ruler (5) is pressed against the upper part of the mounting plate (8) along the axial position direction of the valve, and the upper part of the mounting plate (8) is located above the linear guide rail (26); a limit mechanism is installed on the side of the linear guide rail (26), and the limit mechanism includes a limit touch plate (12) and a limit guide rail (10), the limit touch plate (12) is fixedly connected to the lower part of the horizontal slide (15), the limit guide rail (10) is located outside the linear guide rail (26), and a left limit switch (11) and a right limit switch (13) are slidably installed on the limit guide rail (10), the left limit switch (11) and the right limit switch (13) are located on both sides of the limit touch plate (12), and a tightening bolt is provided on the left limit switch (11) and the right limit switch (13).

2. The metering drive device for a valve pair according to claim 1, wherein: The middle part of the platform (14) is rotatably mounted with a ball screw (23) through a bearing seat (22), and the output shaft of the servo motor (1) is connected to one end of the ball screw (23) through a coupling (21).

3. The metering drive device for a valve pair according to claim 1, wherein: The reading head (4), the grating ruler (5), the left limit switch (11), and the right limit switch (13) are connected to the servo controller (2) through the measuring module (3), and the servo controller (2) controls the servo motor (1).

4. The metering drive device for a valve pair according to claim 1, wherein: The bearing seat (22) and the ball screw (23) are mounted on the fixture frame (9); the linear guide rail (26) is fixed to the fixture frame (9) by bolt connection, and the limit guide rail (10) is fixed to the side of the fixture frame (9); the servo motor (1), the mounting plate (8), the fixture frame (9), and the test fixture (20) are fixed to the platform (14) by bolt connection.

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