Device for testing valve performance

Abstract

The present invention discloses a device for testing valve performance, which comprises: a first retaining body, on which a valve is detachably arranged; a cylinder group, which comprises at least a first cylinder and a second cylinder arranged on the first retaining body; a second retaining body, which is arranged opposite to the first retaining body; a driving mechanism, which is arranged on the second retaining body for driving a handle rod to rotate; wherein: the first cylinder is arranged opposite to an air inlet, and a first connecting block is arranged at the head of a piston rod of the first cylinder, and the first connecting block is driven by the first cylinder to connect with the air inlet; the second cylinder is arranged opposite to an air outlet, and a second connecting block is arranged at the head of a piston rod of the second cylinder, and the second connecting block is driven by the second cylinder to connect with the air outlet; wherein: an air passage connected to the valve is provided on both the first connecting block and the second connecting block.

Description

Technical Field

[0001] The invention relates to the technical field of testing equipment, and in particular to a device for testing valve performance. Background Art

[0002] For valves that play a key role in the entire equipment, their performance needs to be tested after assembly to detect whether the valve meets the use requirements.

[0003] For example, for a pneumatic valve used in a high-speed train, before the pneumatic valve is installed on the high-speed train, it is necessary to detect the starting angle for opening the pneumatic valve and the smoothness of gas passing through the pneumatic valve when the pneumatic valve is opened to the maximum angle.

[0004] In the prior art, the above two tests for pneumatic valves are both performed manually. Specifically, the air port of the pneumatic valve is selectively blocked or connected using an air pipe, and the handle of the pneumatic valve is manually driven and a measuring tool such as a ruler is used to obtain the rotation angle of the handle to detect the starting angle of opening of the pneumatic valve.

[0005] The above-mentioned pneumatic valve in the prior art has the following defects in the performance testing by the above-mentioned manual testing method:

[0006] 1. The operation of manually blocking or connecting the air port of the pneumatic valve is slow, resulting in low test efficiency.

[0007] 2. Manually driving the handle is time-consuming and laborious.

[0008] 3. The measurement error of the rotation angle of the handle is large, resulting in poor detection accuracy of the starting angle of the pneumatic valve opening. Summary of the invention

[0009] In view of the above technical problems existing in the prior art, an embodiment of the present invention provides a device for testing valve performance.

[0010] In order to solve the above technical problems, the technical solution adopted in the embodiments of the present invention is:

[0011] A device for testing valve performance, the valve having at least an air inlet, an air outlet, and a handle connected to a valve core of the valve, the handle driving the valve core to rotate to change the on-off state of the air inlet and the air outlet, the device for testing valve performance comprising:

[0012] a first retaining body, the valve being detachably disposed on the first retaining body;

[0013] a cylinder group, comprising at least a first cylinder and a second cylinder disposed on the first retaining body;

[0014] a second holding body, which is arranged opposite to the first holding body;

[0015] A driving mechanism, which is arranged on the second holding body to drive the handle rod to rotate; wherein:

[0016] The first cylinder is arranged opposite to the air inlet, and a first connecting block is arranged at the head of the piston rod of the first cylinder, and the first connecting block is driven by the first cylinder to connect with the air inlet;

[0017] The second cylinder is arranged opposite to the air outlet, and the head of the piston rod of the second cylinder is provided with a second connecting block, and the second connecting block is driven by the second cylinder to connect with the air outlet; wherein:

[0018] The first connecting block and the second connecting block are both provided with air passages connected to the valve.

[0019] Preferably, the driving mechanism comprises:

[0020] A turntable having a rotating arm thereon;

[0021] A connecting mechanism, used for connecting the rotating arm and the handle rod;

[0022] A transmission assembly, wherein the turntable is arranged on the transmission assembly;

[0023] The actuator drives the rotating disk to rotate through the transmission component, so that the rotating arm drives the handle rod to rotate through the connecting mechanism.

[0024] Preferably, the driving mechanism further includes an encoder for detecting the rotation angle of the turntable.

[0025] Preferably, the connecting mechanism comprises:

[0026] A sleeve, which is directly or indirectly connected to the rotating arm and is arranged perpendicular to the rotating arm, and the sleeve is provided with at least two intersecting shifting grooves;

[0027] The pin is telescopically arranged in the sleeve, and the pin is provided with a gear lever radially extending out of the sleeve. The gear lever is switched in different gear slots to extend or retract the pin, so that the pin passes through the handle rod or comes out of the handle rod.

[0028] Preferably, the connection mechanism further comprises a return spring, and the return spring is arranged in the sleeve to push the pin toward the handle rod.

[0029] Preferably, a slide rail is formed on the rotating arm, and the slide rail extends along the radial direction of the rotating disk;

[0030] A sliding block is arranged on the sliding rail, and the connecting mechanism is connected to the sliding block.

[0031] Preferably, at least two limit blocks are provided on the guide rail, and the at least two limit blocks are respectively located on both sides of the slider in the radial direction, and the two limit blocks are slid along the guide rail and locked at their positions through locking bolts thereon.

[0032] Preferably, the valve core of the valve is limited by a parallel table surface so that the handle rod can rotate relative to the valve core; the device for testing valve performance also includes a verification mechanism; the verification mechanism includes:

[0033] A fixing plate, which is formed with a hollow groove, wherein the lower edge of the hollow groove forms a contact surface for matching with one of the table tops;

[0034] A movable plate, which can move relative to the fixed plate to approach or move away from the contact surface, and a lower edge of the movable plate forms a clamping surface for matching with another table surface;

[0035] A top screw, which is threadedly connected to the fixed plate, and the head of the top screw abuts against the movable plate; wherein:

[0036] The movable plate is moved downward by screwing the top screw so that the clamping surface of the movable plate is in close contact with the table top.

[0037] Preferably, a positioning shaft is also penetrated on the first retaining body; a positioning hole is also opened at the rotation center of the rotating arm; the rotating arm realizes assembly calibration by penetrating the positioning hole once by means of the positioning shaft.

[0038] Preferably, the transmission assembly comprises a worm wheel and a worm that cooperate with each other for transmission, the actuator is a servo motor, the turntable is coaxial with the worm wheel and rotates synchronously; the actuator is used to drive the worm to rotate.

[0039] Compared with the prior art, the device for testing valve performance of the present invention has the following beneficial effects:

[0040] 1. The pneumatic valve can be quickly connected to the gas circuit by using the first cylinder and the second cylinder and the connecting block thereon, so that the preparatory work before the test can be quickly completed, thereby improving the test efficiency.

[0041] 2. The driving mechanism is used to drive the handle rod to rotate, thereby saving manpower.

[0042] 3. The encoder is used to measure the rotation angle of the turntable, and then the rotation angle of the handle can be accurately measured, so that the opening angle of the pneumatic valve can be accurately obtained.

[0043] 4. The connecting mechanism forms a sliding connection with the rotating arm through a slider and a slide rail. If there is a deviation between the axis of the valve core or the rotation center of the handle and the rotation center of the rotating arm, the connecting mechanism slides on the rotating arm to eliminate the rotation inconsistency between the handle and the rotating arm and the impedance phenomenon that may be caused by the deviation.

[0044] 5. The gear lever drives the pin shaft to extend and retract on the connecting mechanism so that the rotating arm can be selectively connected with the handle rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of the three-dimensional structure from one perspective of a device for testing valve performance provided by an embodiment of the present invention.

[0046] Figure 2 for Figure 1 An enlarged view of detail A.

[0047] Figure 3 for Figure 1 An enlarged view of detail B.

[0048] Figure 4 A schematic three-dimensional structure diagram from another perspective of a device for testing valve performance provided by an embodiment of the present invention.

[0049] Figure 5 for Figure 4 An enlarged view of a portion C.

[0050] Figure 6 Schematic diagram of the internal structure of the connecting mechanism.

[0051] In the figure:

[0052] 11-first holding body; 12-second holding body; 13-working table; 20-cylinder group; 21-first cylinder; 211-second connecting block; 212-airway; 22-second cylinder; 221-second connecting block; 222-airway; 23-sealing ring; 30-driving mechanism; 31-turntable; 32-turning arm; 321-slide rail; 322-sliding block; 323-limiting block; 324-locking bolt; 331-worm; 332-worm wheel; 34- Servo motor; 35-encoder; 40-connecting mechanism; 41-sleeve; 411-shift slot; 42-pin shaft; 43-shift handle; 44-spring; 50-verification mechanism; 51-fixed plate; 511-contact surface; 52-movable plate; 521-clamping surface; 53-thrust screw; 100-pneumatic valve; 101-air inlet; 102-air outlet; 103-exhaust port; 104-valve core; 1041-table; 1042-table; 105-handle. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0054] like Figure 1 As shown, an embodiment of the present invention discloses a device for testing valve performance, the valve is specifically a pneumatic valve 100, the pneumatic valve 100 has an air inlet 101, two air outlets 102 and an exhaust port 103, the air inlet 101 and the exhaust port 103 are arranged opposite to each other, and the two air outlets 102 are arranged opposite to each other. The pneumatic valve 100 has a handle 105, the handle 105 is connected to one end of the valve core 104 extending out of the valve body, specifically, the extended end of the valve core 104 is formed with two platforms 1041, 1042, and the handle 105 is provided with a hole matching the extended end, so that the rotation of the handle 105 can drive the valve core 104 to rotate. When the handle 105 drives the valve core 104 to rotate in one direction, the air inlet 101 switches from the cut-off state to the connected state with one of the air inlets 101. It is easy to understand that the handle 105 is bound to experience an opening angle that makes the air inlet 101 just connected with the air outlet 102 and an angle range that makes the air inlet 101 and the air outlet 102 fully connected. When the handle 105 drives the valve core 104 to rotate in the opposite direction, the air inlet 101 switches from the cut-off state to the connected state with the other air inlet 101. It is easy to understand that the handle 105 is bound to experience a starting angle that makes the air inlet 101 and the air outlet 102 just connected and an angle range that makes the air inlet 101 and the air outlet 102 fully connected. It is easy to understand that when the handle 105 is in the middle position, the air inlet 101 and the two air outlets 102 remain in the cut-off state.

[0055] It should be understood that:

[0056] The above-mentioned opening angle is relative to the middle position of the handle rod 105, that is, when the handle rod 105 is in the middle position, it can be considered to be in a 0° angle state.

[0057] like Figures 1 to 6 As shown, the device for testing valve performance provided by the present invention includes: a workbench 13, a first holding body 11, a second holding body 12, a cylinder group 20, a driving mechanism 30, and a verification mechanism 50.

[0058] The first holding body 11 and the second holding body 12 are both plate-shaped and are disposed opposite to each other on the workbench 13 .

[0059] The pneumatic valve 100 is detachably positioned on the inner side of the first holding body 11 by means of positioning pins, so that the air inlet 101 of the pneumatic valve 100 faces upward, the two air outlets 102 face left and right respectively, and the air outlet 103 faces downward.

[0060] The cylinder group 20 includes a first cylinder 21 and two second cylinders 22. The first cylinder 21 is opposite to the air inlet 101, and the head of the piston rod of the first cylinder 21 is provided with a first connecting block 211, and a sealing ring 23 is provided on the end face of the first connecting block 211 facing the air inlet 101. The first connecting block 211 also has an air passage 212, which extends from a side face of the first connecting block 211 and passes through to the end face provided with the sealing ring 23. In this way, the first connecting block 211 is driven by the first cylinder 21 to dock with the air inlet 101, and at this time, the air passage 212 is sealed and connected with the air inlet 101.

[0061] The two second cylinders 22 are respectively opposite to the two air outlets 102, and the head of the piston rod of the second cylinder 22 is provided with a second connection block 221, and a sealing ring 23 is provided on the end face of the second connection block 221 facing the air outlet 102. The second connection block 221 also has an air passage 222, which extends from one side of the second connection block 221 and passes through the end face provided with the sealing ring 23. In this way, the second connection block 221 is driven by the second cylinder 22 to dock with the air outlet 102, and at this time, the air passage 222 is sealed and connected with the air outlet 102.

[0062] The driving mechanism 30 is arranged on the second retaining body 12, and is used to drive the handle rod 105 to rotate. The driving mechanism 30 includes: a rotating disk 31, a rotating arm 32, a transmission assembly, an actuator, a connecting mechanism 40, and an encoder 40. The transmission assembly includes a matching worm wheel 332 and a worm 331, and the worm wheel 332 and the worm 331 are encapsulated in a housing. When assembled, the worm wheel 332 is coaxial with the valve core 104 of the valve. A servo motor 34 is selected as an actuator, and the servo motor 34 drives the worm 331 to rotate to rotate the worm wheel 332. The rotating disk 31 and the worm wheel 332 are coaxially arranged, and the rotating arm 32 is fixed on the rotating disk 31 and extends along the radial direction of the rotating disk 31. In this way, the worm wheel 332 drives the rotating arm 32 to rotate around the axis through the rotating disk 31. A slide rail 321 extending in the radial direction is formed on one side of the rotating arm 32 facing the handle rod 105 . A slider 322 is disposed on the slide rail 321 . The slider 322 can slide along the slide rail 321 .

[0063] The four limit blocks 323 are respectively arranged in pairs on both sides of the sliding direction of the slider 322. A locking bolt 324 is arranged on the limit block 323. When the locking bolt 324 is loosened, the limit block 323 can also move along the slide rail 321. When the locking bolt 324 is tightened, the limit block 323 is locked and fixed. In this way, the sliding range (or sliding stroke) of the slider 322 along the slide rail 321 can be limited by adjusting the distance between the two pairs of limit blocks 323.

[0064] The connection mechanism 40 is used to connect the slider 322 and the handle 105, so that the rotating arm 32 can drive the handle 105 to rotate. Specifically, the connection mechanism 40 includes: a sleeve 41, a pin 42, a return spring 44 and a gear lever 43. The tail end of the sleeve 41 is fixed on the slider 322, and the sleeve 41 and the rotating arm 32 are arranged vertically. At this time, the head of the sleeve 41 faces the handle 105, and three gear slots 411 that penetrate each other are opened on the sleeve 41. The pin 42 is telescopically arranged in the sleeve 41, and the gear lever 43 is radially connected to the pin 42 and penetrates the area where the gear slot 411 is opened. The gear lever 43 can extend or retract the pin 42 by switching between different gears. For example, when the gear lever 43 is switched to the frontmost gear slot 411, the pin shaft 42 extends to the maximum extent to pass through the pin hole on the handle rod 105. At this time, driven by the connecting mechanism 40, the handle rod 105 can rotate with the rotating arm 32. When the baffle is switched to the rearmost gear slot 411, the pin shaft 42 is completely retracted and withdrawn from the pin hole of the handle rod 105, thereby releasing the connection between the connecting mechanism 40 and the handle rod 105, and then contacting the connection transmission between the handle rod 105 and the rotating arm 32.

[0065] The encoder 40 is used to detect the rotation angle of the turntable 31 , and then detect the rotation angle of the rotating arm 32 , and finally detect the rotation angle of the handle 105 .

[0066] The verification mechanism 50 includes: a fixed plate 51, a movable plate 52 and a top screw 53. The fixed plate 51 is formed with a hollow groove, and the lower edge of the hollow groove forms a contact surface 511 for matching with one of the table surfaces 1041; the movable plate 52 can move relative to the fixed plate 51 to approach or move away from the contact surface 511, and the lower edge of the movable plate 52 forms a clamping surface 521 for matching with the other table surface 1042; the top screw 53 is threadedly connected to the fixed plate 51, and the head of the top screw 53 abuts against the movable plate 52; wherein: by screwing the top screw 53 to move the movable plate 52 downward, the clamping surface 521 of the movable plate 52 is in close contact with the table surface 1042. In the present invention, one of the purposes of the verification mechanism 50 is to adjust the table surface to a horizontal state by clamping the table surface, so that the valve core 104 and the handle rod 105 are in the middle position, providing a reference for measuring the opening angle of the pneumatic valve 100.

[0067] The following describes the performance items and testing process of the pneumatic valve 100 that can be tested by the above device:

[0068] One end of the air inlet pipeline is connected to the air source, and the other end is connected to the air passage of the first connecting block 211 on the first cylinder 21 ; one end of the air outlet pipeline is connected to the air storage tank, and the other end is connected to the air passage of the second connecting block 221 on the second cylinder 22 .

[0069] Test the opening angle of the pneumatic valve 100

[0070] Position the pneumatic valve 100 on the first retaining body 11, use a plug to block the left (right) air outlet 102, use the first cylinder 21 to connect the first connecting block 211 to the air inlet 101, and then the air inlet pipeline is connected to the air inlet 101 through the air channel 212 of the first connecting block 211; use the second cylinder 22 to connect the second connecting block 221 to the left (right) air outlet 102, and then the air outlet pipeline is connected to the left (right) air outlet 102 through the air channel 222 of the second connecting block 221.

[0071] It should be noted that a pressure sensor is provided on the air outlet pipe.

[0072] By screwing the top screw 53, the clamping surface 521 of the movable plate 52 is in close contact with the table 1042 at the end of the valve core 104. The table is adjusted to a horizontal state, and the valve core 104 and the handle rod 105 are adjusted to a neutral position. Then, the top screw 53 is screwed in the reverse direction. The movable plate 52 can be moved away from the table by the reset member provided between the movable plate 52 and the fixed plate 51, thereby releasing the restriction on the rotation of the valve core 104.

[0073] The air source is turned on so that the air inlet pipeline has a certain air pressure. The servo motor 34 is used to drive the handle rod 105 to gradually rotate in the direction of connecting the air inlet 101 with the air outlet 102 on the left side (right side). The encoder 40 records the rotation angle at the same time. When the pressure sensor detects that pressure is generated in the air outlet pipeline, the servo motor 34 stops driving the handle rod 105 to rotate. At this time, the angle recorded by the encoder is the opening angle of the pneumatic valve 100.

[0074] Smoothness of gas passing through the pneumatic valve 100

[0075] The air source is turned on, and the servo motor 34 is used to rotate the handle 105 to an angle that fully connects the air inlet 101 with the air outlet 102 on the left (right) side, and ensure that a constant air pressure is maintained in the air inlet pipeline. At this time, the gas provided by the air pressure enters the air storage tank through the air inlet pipeline, the pneumatic valve 100, and the air outlet pipeline, so that the air storage tank continues to collect gas for a preset time, and then, the flow rate of gas passing through the pneumatic valve 100 per unit time is calculated based on the amount of gas in the air storage tank, thereby determining the smoothness of the pneumatic valve 100.

[0076] Exhaust performance of pneumatic valve 100

[0077] Block the two air outlets 102 of the pneumatic valve 100, open the air source, increase the air source pressure, open the exhaust port 103, collect the gas discharged from the exhaust port 103, and verify the exhaust performance of the pneumatic valve 100 according to the gas pressure, for example, whether the gas is exhausted under the preset pressure and the exhaust volume per unit time.

[0078] Based on the above description, the advantages of the device provided by the above embodiments of the present invention are:

[0079] 1. The pneumatic valve 100 can be quickly connected to the air circuit by using the first cylinder 21 and the second cylinder 22 and the connecting blocks thereon, so that the preparatory work before the test can be quickly completed, thereby improving the test efficiency.

[0080] 2. The driving mechanism 30 is used to drive the handle rod 105 to rotate, thereby saving manpower.

[0081] 3. The encoder 40 is used to measure the rotation angle of the turntable 31 and thus the rotation angle of the handle 105 can be accurately measured, and thus the opening angle of the pneumatic valve 100 can be accurately obtained.

[0082] 4. The connecting mechanism 40 forms a sliding connection with the rotating arm 32 by means of the slider 322 and the slide rail 321. If there is a deviation between the axis of the valve core 104 or the rotation center of the handle rod 105 and the rotation center of the rotating arm 32, the connecting mechanism 40 slides on the rotating arm 32 to eliminate the rotation inconsistency between the handle rod 105 and the rotating arm 32 and the impedance phenomenon that may be caused by the deviation.

[0083] 5. The gear lever 43 on the connecting mechanism 40 drives the pin shaft 42 to extend and retract, so that the rotating arm 32 can be selectively connected to the handle rod 105.

[0084] In a preferred embodiment of the present invention, a positioning shaft is also provided on the first retaining body 11; a positioning hole is also provided at the rotation center of the rotating arm 32; and the rotating arm 32 is assembled and calibrated by once penetrating the positioning hole with the positioning shaft. In this embodiment, the positioning shaft is used to make the rotation center of the rotating arm 32 as consistent as possible with the rotation center of the valve core 104 of the pneumatic valve 100 when assembling the test device. The positioning hole penetrated by the positioning shaft has a certain relative position with the pin or hole used to position the pneumatic valve 100, so that after the pneumatic valve 100 is positioned, the rotation center of the valve core 104 is highly concentric with the positioning shaft. Therefore, when installing the rotating arm 32, the positioning shaft is penetrated through the positioning hole of the rotating arm 32, and then the rotating arm 32 is fixed, and then the positioning shaft is removed. In this way, when the pneumatic valve 100 is subsequently positioned, the rotation center of the valve core 104 of the pneumatic valve 100 is highly concentric with the rotation center of the rotating arm 32.

[0085] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A device for testing valve performance, wherein the valve has at least an air inlet, an air outlet, and a handle connected to a valve core of the valve, wherein the handle drives the valve core to change the on / off state of the air inlet and the air outlet by rotating, characterized in that: The device for testing valve performance comprises: a first retaining body, the valve being detachably disposed on the first retaining body; a cylinder group, comprising at least a first cylinder and a second cylinder disposed on the first retaining body; a second holding body, which is arranged opposite to the first holding body; A driving mechanism, which is arranged on the second holding body to drive the handle rod to rotate; wherein: The first cylinder is arranged opposite to the air inlet, and a first connecting block is arranged at the head of the piston rod of the first cylinder, and the first connecting block is driven by the first cylinder to connect with the air inlet; The second cylinder is arranged opposite to the air outlet, and the head of the piston rod of the second cylinder is provided with a second connecting block, and the second connecting block is driven by the second cylinder to connect with the air outlet; wherein: The first connection block and the second connection block are both provided with air passages connected to the valve; The driving mechanism comprises: A turntable having a rotating arm thereon; A connecting mechanism, used for connecting the rotating arm and the handle rod; A transmission assembly, wherein the turntable is arranged on the transmission assembly; An actuator, which drives the turntable to rotate via a transmission assembly, so that the rotating arm drives the handle to rotate via a connecting mechanism; The connecting mechanism comprises: A sleeve, which is directly or indirectly connected to the rotating arm and is arranged perpendicular to the rotating arm, and the sleeve is provided with at least two intersecting shifting grooves; A pin shaft is telescopically arranged in the sleeve, and the pin shaft has a gear lever radially extending out of the sleeve, and the gear lever is switched in different gear slots to extend or retract the pin shaft, so that the pin shaft passes through the handle rod or escapes from the handle rod; The valve core of the valve is limited by the parallel table surface to rotate the handle relative to the valve core; the device for testing valve performance also includes a verification mechanism; the verification mechanism includes: A fixing plate, which is formed with a hollow groove, wherein the lower edge of the hollow groove forms a contact surface for matching with one of the table tops; A movable plate, which can move relative to the fixed plate to approach or move away from the contact surface, and a lower edge of the movable plate forms a clamping surface for matching with another table surface; A top screw, which is threadedly connected to the fixed plate, and the head of the top screw abuts against the movable plate; wherein: The movable plate is moved downward by screwing the top screw so that the clamping surface of the movable plate is in close contact with the table top.

2. The device for testing valve performance according to claim 1, characterized in that: The driving mechanism further includes an encoder for detecting the rotation angle of the turntable.

3. The device for testing valve performance according to claim 1, characterized in that: The connecting mechanism also includes a return spring, which is arranged in the sleeve and is used to push the pin toward the handle rod.

4. The device for testing valve performance according to claim 1, characterized in that: A slide rail is formed on the rotating arm, and the slide rail extends along the radial direction of the rotating disk; A sliding block is arranged on the sliding rail, and the connecting mechanism is connected to the sliding block.

5. The device for testing valve performance according to claim 4, characterized in that: At least two limit blocks are arranged on the slide rail, and the at least two limit blocks are respectively located on both sides of the slider in the radial direction. The two limit blocks are slid along the slide rail and locked at their positions through locking bolts thereon.

6. The device for testing valve performance according to claim 1, characterized in that: A positioning shaft is also provided on the first holding body; a positioning hole is also provided at the rotation center of the rotating arm; the rotating arm realizes assembly calibration by once penetrating the positioning hole with the positioning shaft.

7. The device for testing valve performance according to claim 1, characterized in that: The transmission assembly comprises a worm wheel and a worm that cooperate with each other for transmission, the actuator is a servo motor, the turntable is coaxial with the worm wheel and is arranged to rotate synchronously; the actuator is used to drive the worm to rotate.

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