Pneumatic measuring device for small gap of cambered surface of pendulum bob valve assembly and use method of pneumatic measuring device

Abstract

The invention discloses a pneumatic measuring device for a small gap of a cambered surface of a pendulum valve assembly and a using method. An air pressure stabilizer is connected with a testing connector and a working connector through hoses; the micro-motion measuring rack is provided with a gauge block and a process nozzle; the working joint is arranged on the measuring seat; the process nozzle and a narrow groove of a valve in the pendulum valve assembly are the same in size and shape; the process nozzle is matched with the test connector, and the test connector and the working connector are the same in size and shape; the air pressure stabilizer is connected with a digital pressure sensor; an elastic piece is sleeved outside the mandrel rod, one end of the elastic piece is connected with the mandrel rod, and the other end of the elastic piece is connected with the bottom of the top plate of the base. According to the invention, by utilizing the characteristic that a gas path can be formed by a cambered surface narrow groove and a structure of a measured object part and adopting a non-contact pneumatic measurement technology, high-precision digital display measurement of a gap between two cambered surfaces is realized, the measurement error can be reduced, and the product quality can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pneumatic measurement of arc surface micro-gap, and in particular relates to a pneumatic measurement device for arc surface micro-gap of a pendulum valve assembly and a use method thereof. Background Art

[0002] The pendulum valve assembly assembly technology requires that under the action of a certain force, the pendulum and the valve should maintain a clearance of (0.01 to 0.015) mm throughout the entire swing range. The size of the gap between the two arc surfaces directly affects the flexibility of the pendulum movement and the stability of the oil pressure in the working cavity. Due to structural limitations, the pendulum valve assembly cannot use the light gap method to measure the gap. At the assembly site, 0.01 mm and 0.015 mm feeler gauges are used to measure the tiny gaps on the arc surfaces. The feeler gauges are too thin and easily deformed during measurement. The measurement accuracy is not high and is greatly affected by human factors. Quantitative measurement cannot be achieved to obtain the actual value of the gap. In addition, the feeler gauge measurement is a contact measurement that is easy to wear, which will cause the sharp edges of the windows on the two arc surfaces to wear and produce burrs, which will bring quality risks.

[0003] The patent publication number is CN114290180A, and the name is a patent application for a method for grinding arc surfaces of a pendulum assembly and a nozzle valve and a grinding device thereof, which includes a grinding tooling, a pendulum bracket, a pendulum assembly and a nozzle valve. The pendulum assembly and the pendulum bracket are connected and rotated by a pin at the tail end. The pendulum assembly is provided with a convex arc surface. The nozzle valve passes through the inner hole at the front end of the pendulum bracket. Two screws connect the nozzle valve to the pendulum bracket. The nozzle valve is provided with a concave arc surface. An elastic gasket is installed between the nozzle valve and the pendulum bracket for adjusting the gap between the convex and concave arc surfaces; the grinding tooling includes a base plate and a tooling base. The tooling base is equipped with a spring seat, a spring, and an adjustment pin to form a feeding mechanism to provide thrust for the nozzle valve, so that the convex and concave arc surfaces fit together, and abrasive paste is applied to achieve grinding of the convex and concave arc surfaces, remove the high points of the grinding arc surface, correct the center height difference of the inner and outer arc surfaces, ensure that the gap of the arc surface is uniform within the working range, and the arc surface swings without jamming when opening and closing. This patent application can solve the problem of gap swing jamming of the pendulum valve assembly, but it cannot perform non-destructive and accurate measurement of the tiny gap on the arc surface of the pendulum valve assembly. Summary of the invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a pneumatic measuring device for the tiny gap on the arc surface of a pendulum valve assembly and a method for using it. By utilizing the characteristics that the narrow groove on the arc surface of the measured object part and the structure itself can form an air path, non-contact pneumatic measurement technology is adopted to achieve high-precision digital display measurement of the gap between the two arc surfaces. The device is stable, reliable, easy to use, and can significantly reduce measurement errors, thereby improving product quality and increasing production efficiency.

[0005] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a pneumatic measuring device for arc surface micro-gap of a pendulum valve assembly, comprising: An electrical box, the electrical box comprising an air pressure stabilizer, the air pressure stabilizer being respectively connected to a test joint and a working joint through a hose; A micro-motion measuring stand, wherein the micro-motion measuring stand is provided with a gauge block and a process nozzle; A measuring seat, on which the working joint is arranged; Among them, the process nozzle is the same size and shape as the narrow groove of the valve in the pendulum valve assembly; the process nozzle matches the test joint, and the test joint and the working joint are the same size and shape; the air pressure stabilizer is connected to a digital pressure sensor, and the digital pressure sensor is electrically connected to a CPU processor; the measuring seat includes a base, the base includes a middle support member, the top of the middle support member is provided with a top plate, a positioning plate is installed on the middle support member of the base, a mounting column is provided on the positioning plate, an air outlet hole penetrating the positioning plate is opened on the positioning plate, and the air outlet hole is connected to the working joint; a core rod is movably installed on the top plate of the base, and an elastic member is provided on the outer sleeve of the core rod, one end of the elastic member is connected to the core rod, and the other end is connected to the bottom of the top plate of the base.

[0006] Optionally, the air pressure stabilizer is connected to an air source via a hose.

[0007] Optionally, the elastic member is a spring.

[0008] Optionally, a top plate through hole is opened on the top plate of the base, the core rod is installed in the top plate through hole of the base, a sleeve is arranged on the outer sleeve of the core rod, the sleeve is arranged on the top of the top plate of the base, a rotating pin is arranged on the top of the core rod, and a slot matching the rotating pin is arranged on the top of the sleeve.

[0009] Optionally, a washer is provided between the elastic member and the bottom of the top plate, and the washer is sleeved on the core rod.

[0010] Optionally, a mounting through hole is provided on the middle support member of the base, the working joint is installed in the mounting through hole, and an air outlet hole connected to the mounting through hole is provided on the positioning plate.

[0011] Optionally, the positioning plate is mounted on a middle support member of the base via fasteners.

[0012] In a second aspect, the present invention provides a method for using the pneumatic measuring device for arc surface micro-gap of a pendulum valve assembly, comprising the following steps: S1: Place the process nozzle with the test joint installed on the corresponding mounting hole of the micro-motion measuring stand, and continuously change the gap between the gauge block and the process nozzle by moving the gauge block of the micro-motion measuring stand, and read the value through the electric box. After multiple measurements, establish a database of the relationship between the gap and pressure value between the gauge block and the process nozzle; S2: Install the pendulum on the mounting column, keeping the core rod out of contact with the pendulum; S3: Swing the pendulum and read the gap between the pendulum and the valve through the electric box; S4: applying pressure to the mandrel through the elastic member so that the end of the mandrel is connected to the connecting shaft of the pendulum; S5: Repeat step S3 to perform measurement.

[0013] Optionally, when reading the size of the gap between the pendulum and the valve through an electric box, take the reading when the value of the electric box stabilizes.

[0014] Optionally, in step S1, the distance the gauge block moves each time the micro-motion measuring stand measures is 0.0002 mm.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The pneumatic measuring device for the arc surface micro-gap of a pendulum valve assembly of the present invention utilizes the characteristics that the arc surface narrow groove of the measured object part and the assembly structure itself can form an air path, adopts non-contact pneumatic measurement technology, and realizes high-precision digital display measurement of the gap between two arc surfaces. It is stable and reliable, easy to use, and can significantly reduce measurement errors, thereby improving product quality and increasing production efficiency.

[0016] The present invention utilizes the structural characteristics and working characteristics of the measured part, proposes to use the valve of the product part as the process nozzle, and install it on the universal micro-motion measuring stand to form a nozzle baffle with the gauge block. Using the principle of fluid mechanics, under certain conditions, the plane gap is equivalent to the arc surface gap, and the gap value of the nozzle baffle can be determined by rotating the differential head of the micro-motion measuring stand.

[0017] The pneumatic measuring device of the present invention comprises a measuring seat, an electric box and a micro-motion measuring stand. The measured piece is reliably positioned, the force is accurately applied, the operation is convenient, the display is intuitive, the reading is accurate, and the high-precision digital measurement of the gap is realized. At the same time, the network can be used for data set and statistical analysis, and the data can be stored to realize paperless measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 It is a side view of the measuring seat of the present invention; Figure 2 It is a front view of the measuring seat of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the AA section; Figure 4 This is a functional schematic diagram of the electric box of the present invention; Figure 5 It is a schematic diagram of the connection between the process nozzle and the joint of the present invention.

[0019] Among them, 1. base; 2. positioning plate; 3. core rod; 4. bushing; 5. gasket; 6. elastic part; 7. mounting column; 8. first nut; 9. stud; 10. cylindrical pin; 11. screw; 12. rotating pin; 13. second nut; 14. test joint; 15. working joint; 16. process nozzle; 20. electrical box; 201. air filter; 202. air source valve; 203. air regulator; 204. throttle valve; 205. digital pressure sensor; 206. CPU processor; 207. display; 30. air source. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in 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 described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0021] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0022] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, the singular forms of "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0024] The present invention is described in detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 5 As shown, a pneumatic measuring device for arc surface micro-gap of a pendulum valve assembly of the present invention comprises: An electrical box 20, the electrical box 20 comprising an air pressure stabilizer 203, the air pressure stabilizer 203 being respectively connected to a test connector 14 and a working connector 15 via a hose; A micro-motion measuring stand, on which a gauge block and a process nozzle 16 are provided; A measuring seat, on which the working joint 15 is arranged; Among them, the process nozzle 16 is the same size and shape as the narrow groove of the valve in the pendulum valve assembly; the process nozzle 16 matches the test joint 14, and the test joint 14 and the working joint 15 are the same size and shape; the air stabilizer 203 is connected to a digital pressure sensor 205, and the digital pressure sensor 205 is electrically connected to a CPU processor 206; the measuring seat includes a base 1, the base 1 includes a middle support member, and a top plate is arranged on the top of the middle support member, a positioning plate 2 is installed on the middle support member of the base 1, and a mounting column 7 is arranged on the positioning plate 2, and an air outlet hole penetrating the positioning plate 2 is opened on the positioning plate 2, and the air outlet hole is connected to the working joint 15; a core rod 3 is movably installed on the top plate of the base 1, and an elastic member 6 is arranged on the outer shell of the core rod 3, one end of the elastic member 6 is connected to the core rod, and the other end is connected to the bottom of the top plate of the base 1.

[0026] The pneumatic measuring device for the arc surface micro-gap of a pendulum valve assembly of the present invention comprises the following steps when in use: S1: placing the process nozzle 16 with the test joint 14 installed on the corresponding installation hole of the micro-motion measurement stand, continuously changing the gap between the gauge block and the process nozzle 16 by moving the gauge block of the micro-motion measurement stand, and reading the value through the electric box 20, and establishing a database of the relationship between the gap and pressure value between the gauge block and the process nozzle 16 through multiple measurements; S2: Install the pendulum on the mounting column 7, keeping the core rod 3 not in contact with the pendulum; S3: Swing the pendulum and read the gap between the pendulum and the valve through the electric box 20; S4: applying pressure to the core rod 3 through the elastic member 6, so that the end of the core rod 3 is connected to the connecting shaft of the pendulum; S5: Repeat step S3 to perform measurement.

[0027] The pneumatic measuring device for the arc surface micro-gap of a pendulum valve assembly of the present invention utilizes the characteristics that the arc surface narrow groove of the measured object part and the assembly structure itself can form an air path, and adopts non-contact pneumatic measurement technology to achieve high-precision digital display measurement of the gap between the two arc surfaces. It is stable and reliable, easy to use, and significantly reduces measurement errors, thereby improving product quality and production efficiency. The present invention utilizes the structural characteristics of the measured part and its working characteristics, and proposes to use the product part valve as a process nozzle 16, which is installed on a universal micro-motion measurement stand to form a nozzle baffle with a gauge block. Using the principles of fluid mechanics, under certain conditions, the plane gap is equivalent to the arc surface gap, and the gap value of the nozzle baffle can be determined by rotating the differential head reading of the micro-motion measurement stand.

[0028] The present invention uses a pneumatic measuring device to perform measurement, and the measured piece is reliably positioned, the force is accurately applied, the operation is convenient, the display is intuitive, the reading is accurate, and high-precision digital measurement of the gap can be achieved.

[0029] At the same time, the present invention uses test data to establish a database of the gap and pressure between the gauge block and the process nozzle 16, so as to retrieve corresponding values, and can network data sets and statistical analysis, store data, and realize paperless measurement.

[0030] Example 1 like Figures 1 to 5 As shown, a pneumatic measuring device for arc surface micro-gap of a pendulum valve assembly of the present invention comprises an electric box 20, a micro-motion measuring stand and a measuring seat.

[0031] like Figure 4 As shown, the electric box 20 includes an air pressure stabilizer 203, a digital pressure sensor 205, a CPU processor 206 and a display 207. The air pressure stabilizer 203 is connected to the air source 30 through an air intake hose, and the air intake hose is provided with an air filter 201 and an air source valve 202. The air pressure stabilizer 203 is respectively connected to a test hose and a working hose through an outlet hose, the test hose is connected to a test connector 14, and the working hose is connected to a working connector 15. The air pressure stabilizer 203 can ensure the output of stable air pressure.

[0032] The outlet hose is provided with a throttle valve 204 and a digital pressure sensor 205, the digital pressure sensor 205 is electrically connected to a CPU processor 206, and the CPU processor 206 is electrically connected to a display 207. The digital pressure sensor 205 can convert a pressure signal into a digital signal, the CPU processor 206 can record the digital signal and perform calculations, and display the calculation results through the display 207. Specifically, the display 207 is a touch screen.

[0033] Specifically, the digital pressure sensor 205 is a silicon cup chip type digital pressure sensor.

[0034] like Figure 4 and Figure 5 As shown, the test connector 14 is connected to a process nozzle 16 matching therewith.

[0035] Specifically, the micro-motion measurement stand has a gauge block and a mounting hole, and the mounting hole of the micro-motion measurement stand is used to install the process nozzle 16. The process nozzle 16 has the same size and shape as the narrow slot of the valve, and the test joint 14 has the same size and shape as the working joint 15. The gauge block of the micro-motion measurement stand can serve as a baffle for the process nozzle 16.

[0036] Specifically, the process nozzle 16 is a square nozzle.

[0037] Optionally, the model of the micro-motion measurement bench is a BCT-5C precision micro-motion measurement bench.

[0038] The gap between the gauge block and the process nozzle 16 can be determined by rotating the micrometer head of the micro-measurement stand.

[0039] The measuring seat comprises: a base 1 , a positioning plate 2 , a core rod 3 , a bushing 4 and a rotating pin 12 .

[0040] The base 1 is in an I-shape, and includes a middle support member, and a top plate and a bottom plate are respectively provided at both ends of the middle support member. A top plate through hole is provided on the top plate of the base 1, and the core rod 3 is installed in the top plate through hole of the base 1. The bushing 4 is sleeved outside the core rod 3, and the bushing 4 is provided on the top of the top plate of the base 1. A slot is provided on the top of the bushing 4, and the rotating pin 12 passes through the top of the core rod 3. The rotating pin 12 can be stuck in the slot of the bushing 4.

[0041] An elastic member 6 is sleeved on the outer side of one end of the core rod 3 away from the rotating pin 12, and a step is provided on the upper part of the core rod 3. Specifically, the elastic member 6 is a spring. A washer 5 is sleeved on the outer side of the core rod 3, one end of the elastic member 6 is fixedly connected to the step of the core rod 3, and the other end is connected to the washer 5. The end of the core rod 3 away from the rotating pin 12 matches the rotating axis of the pendulum.

[0042] The positioning plate 2 is connected to the middle support of the base 1 through a fastener. An air outlet is provided on the positioning plate 2, and an installation through hole is provided on the middle support of the base 1 for installing the working joint 15, and the installation through hole is connected to the air outlet.

[0043] Specifically, the fastener comprises a stud 9, a cylindrical pin 10 and a screw 11. One end of the stud 9 is provided with a first nut 8, and the other end of the stud 9 is provided with a second nut 13.

[0044] The positioning plate 2 is provided with a mounting post 7, the end of which is provided with a nut, and the mounting post 7 is used to mount the pendulum assembly. The positioning plate 2 is provided with a positioning hole, which matches the positioning shaft of the pendulum assembly.

[0045] Example 2 This embodiment is a pneumatic measuring device for arc surface micro-gap of pendulum valve assembly based on embodiment 1. In this embodiment, the model of the micro-motion measuring stand is BCT-5C precision micro-motion measuring stand. In this embodiment, the display 207 is a touch screen.

[0046] The pneumatic measuring device for the arc surface micro-gap of a pendulum valve assembly of the present invention comprises the following steps when in use: Open the gas source 30 and the gas source valve 202, connect the gas source 30 and the test joint 14 through a hose, install the process nozzle 16 on the test joint 14, and place the process nozzle 16 on the corresponding mounting hole of the micro-motion measurement stand. By moving the gauge block of the micro-motion measurement stand, the gap between the gauge block and the process nozzle 16 is continuously changed. Every time the feed is 0.0002 mm, the gap value is read through the display 207 on the electrical box 20. Through multiple measurements, a database of the relationship between the gap and pressure value between the gauge block and the process nozzle 16 is established.

[0047] Specifically, the gap between the gauge block and the process nozzle 16 can be determined by rotating the reading of the micro-motion measuring stand differential head. The pressure signal can be converted into a digital signal by the digital pressure sensor 205 of the electric box 20. The digital signal can be recorded by the CPU processor 206.

[0048] After establishing a database of the relationship between the gap and the pressure value between the gauge block and the process nozzle 16, the air source 30 and the working joint 15 are connected through a hose, and the pendulum assembly is installed on the positioning plate 2 so that the core rod 3 does not contact the pendulum.

[0049] The pendulum is swung, and the size of the gap between the pendulum and the valve is read through the display 207 of the electric box 20.

[0050] The elastic member 6 applies pressure to the mandrel 3, so that the end of the mandrel 3 is connected to the connecting shaft of the pendulum. The pendulum is swung, and the gap size between the pendulum and the valve in the force-applied state is read through the display 207 of the electric box 20.

[0051] The present invention can retrieve corresponding values ​​by establishing a database between the gap and pressure between the gauge block and the process nozzle 16. According to the actual value of the arc surface gap obtained by pneumatic measurement, the law of gap size and performance test qualification is established, which can improve the hydraulic performance test debugging efficiency of the pendulum valve assembly and find the best performance curve.

[0052] Unless otherwise specified, the device elements involved in the above embodiments are all conventional device elements, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A pneumatic measuring device for arc surface micro-gap of pendulum valve assembly, characterized in that: include: An electrical box (20), the electrical box (20) comprising an air pressure stabilizer (203), the air pressure stabilizer (203) being respectively connected to a test connector (14) and a working connector (15) via a hose; A micro-motion measuring stand, wherein the micro-motion measuring stand has a gauge block and a process nozzle (16); A measuring seat, the working joint (15) being arranged on the measuring seat; The process nozzle (16) is of the same size and shape as the narrow slot of the valve in the pendulum valve assembly; the process nozzle (16) matches the test joint (14), and the test joint (14) and the working joint (15) are of the same size and shape; the air regulator (203) is connected to a digital pressure sensor (205), and the digital pressure sensor (205) is electrically connected to a CPU processor (206); the test seat comprises a base (1), the base (1) comprises a middle support member, and the A top plate is arranged at the top end of the middle support member, a positioning plate (2) is installed on the middle support member of the base (1), a mounting column (7) is arranged on the positioning plate (2), an air outlet hole penetrating the positioning plate (2) is opened on the positioning plate (2), and the air outlet hole is connected to the working joint (15); a core rod (3) is movably installed on the top plate of the base (1), and an elastic member (6) is arranged on the outer sleeve of the core rod (3), one end of the elastic member (6) is connected to the core rod, and the other end is connected to the bottom of the top plate of the base (1).

2. A pneumatic measuring device for arc surface micro-gap of a pendulum valve assembly according to claim 1, characterized in that: The air pressure stabilizer (203) is connected to an air source (30) via a hose.

3. The pneumatic measuring device for arc surface micro-gap of pendulum valve assembly according to claim 1, characterized in that: The elastic member (6) is a spring.

4. The pneumatic measuring device for arc surface micro-gap of pendulum valve assembly according to claim 1, characterized in that: A top plate through hole is provided on the top plate of the base (1), the core rod (3) is installed in the top plate through hole of the base (1), a sleeve (4) is provided on the outer sleeve of the core rod (3), the sleeve (4) is arranged on the top of the top plate of the base (1), a rotating pin (12) is provided on the top of the core rod (3), and a slot matching the rotating pin (12) is provided on the top of the sleeve (4).

5. The pneumatic measuring device for arc surface micro-gap of pendulum valve assembly according to claim 1, characterized in that: A washer (5) is provided between the elastic member (6) and the bottom of the top plate, and the washer (5) is sleeved on the core rod (3).

6. The pneumatic measuring device for arc surface micro-gap of pendulum valve assembly according to claim 1, characterized in that: A mounting through hole is provided on the middle support member of the base (1), the working joint (15) is installed in the mounting through hole, and an air outlet hole connected to the mounting through hole is provided on the positioning plate (2).

7. The pneumatic measuring device for arc surface micro-gap of pendulum valve assembly according to claim 1, characterized in that: The positioning plate (2) is mounted on the middle support member of the base (1) via fasteners.

8. The method for using the pneumatic measuring device for arc surface micro-gap of a pendulum valve assembly according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: placing a process nozzle (16) equipped with a test joint (14) on a corresponding mounting hole of a micro-motion measuring stand, continuously changing the gap between the gauge block and the process nozzle (16) by moving a gauge block of the micro-motion measuring stand, and reading a value through an electric box (20), and establishing a database of the relationship between the gap and pressure value between the gauge block and the process nozzle (16) through multiple measurements; S2: Mount the pendulum on the mounting column (7) and keep the core rod (3) from contacting the pendulum; S3: Swing the pendulum and read the gap between the pendulum and the valve through the electric box (20); S4: applying pressure to the core rod (3) through the elastic member (6) so that the end of the core rod (3) is connected to the connecting shaft of the pendulum; S5: Repeat step S3 to perform measurement.

9. The method for using the pneumatic measuring device for arc surface micro-gap of a pendulum valve assembly according to claim 8, characterized in that: When reading the gap between the pendulum and the valve through the electric box (20), the reading is performed when the value of the electric box (20) is stable.

10. The method for using the pneumatic measuring device for arc surface micro-gap of a pendulum valve assembly according to claim 8, characterized in that: In step S1, the distance of the moving gauge block is 0.0002 mm each time the micro-motion measuring stand is measured.

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