A high-pressure gas-driven portable impact sensor calibration device and method

Abstract

The application discloses a kind of high-pressure gas-driven portable impact sensor calibration device and method, to solve the problems that sensor cable is easily damaged, not accurate and not suitable for field experiment use. Specifically includes piston hammer impact assembly, the round barrel-shaped calibration shell being arranged below piston hammer impact assembly, the piston hammer being arranged in calibration shell and the air pump being arranged outside calibration shell;Piston hammer impact assembly is circular, its lower end edge is used to install sensor, the middle part is provided with conical target plate, the small end of conical target plate forms target surface downward, and the target surface corresponds with the upper end opening of calibration shell;Coaxial installation is carried out in the cavity of calibration shell with base plate;Base plate divides the inner cavity of calibration shell into upper cavity and lower cavity;Gas escape hole is arranged on the sidewall of upper cavity;First air hole is arranged on the sidewall of lower cavity;Second air hole is arranged in the center of base plate;Piston hammer is located in upper cavity and is seated on base plate, and its sidewall is gap fit with the inner wall of calibration shell;Air pump is communicated with first air hole.

Description

Technical Field

[0001] This invention relates to a sensor calibration device and method, specifically to a high-pressure gas-driven portable impact sensor calibration device and method. Background Technology

[0002] Impact mechanics sensors (such as accelerometers and velocity sensors) are fundamental units for acquiring parameters of impact sources, target impact environments, and target responses in scientific research experiments and engineering construction. They have wide applications and play a vital role. Because the sensitive elements of these sensors exhibit time-varying characteristics, their sensitivity parameters change over time. Therefore, to improve the accuracy of the acquired data, the sensitivity of the sensors generally needs to be recalibrated before use.

[0003] Traditional methods for calibrating this type of sensor involve using a drop hammer to impact a calibration target plate, generating high acceleration. This acceleration serves as the excitation source for both the standard sensor and the sensor to be calibrated, and they are calibrated back-to-back. Existing sensor calibration methods require mounting the sensor to be calibrated on the drop hammer, allowing it to move with the hammer. However, this method typically presents several problems:

[0004] (1) Existing impact sensor calibration devices can only calibrate a small number of sensors per impact, which is inefficient. Furthermore, the sensors and their cables need to move with the falling hammer, making them susceptible to motion interference. Moreover, the cables are at risk of being damaged.

[0005] (2) Some moving parts in the calibration device are still driven manually, which is time-consuming, laborious and not accurate enough;

[0006] (3) The impact force comes from free fall, which has poor adjustability and the maximum acceleration is limited by the height of the device;

[0007] (4) Existing impact sensor calibration devices are bulky, difficult to carry, and unsuitable for field experiments. Summary of the Invention

[0008] The purpose of this invention is to provide a high-pressure gas-driven portable impact sensor calibration device and method to solve the technical problems of sensor cables being easily damaged, inaccurate driving, poor adjustability, and unsuitability for field experiments.

[0009] To achieve the above objectives, the present invention provides a high-pressure gas-driven portable impact sensor calibration device, which is characterized by including a piston hammer impact assembly, a cylindrical calibration housing disposed below the piston hammer impact assembly, a piston hammer disposed inside the calibration housing, and an air pump disposed outside the calibration housing.

[0010] The piston hammer impact assembly is circular, and its lower edge is used to install a sensor. The sensor includes a sensor to be calibrated and a standard sensor. The central part is provided with a downwardly protruding conical target plate with the small end of the conical target plate facing downward. The end face of the small end is the target surface, which corresponds to the upper opening of the calibration housing.

[0011] A base plate is coaxially mounted inside the calibration housing cavity; the base plate divides the calibration housing cavity into an upper cavity and a lower cavity; a vent hole is provided on the side wall of the upper cavity; a first vent hole is provided on the side wall of the lower cavity; and a second vent hole is provided at the center of the base plate.

[0012] The piston hammer is located in the upper cavity and sits on the base plate, with its sidewalls fitting with the inner wall of the calibration housing.

[0013] The air pump is connected to the first vent via an air inlet connector to allow air to enter the downward cavity. The gas passes through the second vent and impacts the piston hammer, causing the piston hammer to move upward and strike the target surface of the piston hammer impact assembly, thereby achieving sensor calibration.

[0014] Furthermore, the bottom of the piston hammer has a vertical hole along its axis, a radial hole communicating with the vertical hole along its radial direction, and an annular groove with both ends communicating with the radial hole along its circumference; when the piston hammer contacts the target surface of the piston hammer impact assembly, the radial hole or the annular groove communicates with the vent hole.

[0015] Furthermore, it also includes magnets that are both in the shape of circular rings and magnet fastening plates;

[0016] The piston hammer has a two-stage stepped hole at its bottom, which includes a first large hole and a first small hole arranged coaxially from bottom to top; a first stepped surface is formed between the first large hole and the first small hole.

[0017] The magnet is installed inside the first small hole;

[0018] The magnet fastening plate is installed in the first large hole, its upper surface abuts against the first stepped surface, and is fixed to the piston hammer, thereby pressing the magnet onto the bottom of the piston hammer.

[0019] The magnet and the magnet fastening plate are both coaxial with the piston hammer, such that the center holes of both are connected to the second vent hole and the vertical hole; the lower end face of the magnet fastening plate is flush with the lower end face of the piston hammer.

[0020] The bottom or base plate of the calibration housing is made of iron.

[0021] Furthermore, the inner cavity of the calibration housing is a three-stage stepped hole, which, from bottom to top, includes a second large hole, a middle hole, and a second small hole arranged coaxially. A second stepped surface is formed between the second large hole and the middle hole, and a third stepped surface is formed between the middle hole and the second small hole. The middle hole and the second small hole constitute the upper cavity of the calibration housing, and the second large hole constitutes the lower cavity of the calibration housing.

[0022] The substrate is disposed in the second large hole, its upper surface abuts against the second stepped surface, its outer ring is fixed to the calibration housing, and its inner ring is used to house the piston hammer.

[0023] The piston hammer has a shoulder on its outer wall, so that its lower outer wall is in clearance fit with the inner wall of the middle hole and its upper outer wall is in clearance fit with the inner wall of the second small hole.

[0024] The target surface of the piston hammer impact assembly corresponds to the second small hole.

[0025] Furthermore, it also includes compression springs;

[0026] The compression spring is fitted between the central hole of the calibration housing cavity and the piston hammer, with its upper end abutting against the third step surface and its lower end abutting against the shoulder on the outer wall of the piston hammer.

[0027] Furthermore, the calibration housing includes a circular base and a cylindrical pneumatic outer shell;

[0028] The base is located at the lower end of the pneumatic housing, and its outer circle is connected to the flange of the pneumatic housing. A cylindrical protrusion is provided in the center. The outer diameter of the protrusion matches the inner diameter of the second large hole, so that the protrusion can extend into the second large hole and fit tightly against the inner wall of the second large hole. A first sealing ring is provided between the outer circle of the base and the pneumatic housing.

[0029] Multiple second sealing rings are embedded on the lower outer wall of the piston hammer.

[0030] Furthermore, a portion of the multi-turn second sealing ring is located above the radial hole, and another portion is located below the radial hole.

[0031] Furthermore, it also includes solenoid valves, time controllers, and exhaust silencers;

[0032] The solenoid valve is installed on the pipeline between the air pump and the calibration housing;

[0033] The time controller is electrically connected to the solenoid valve;

[0034] The exhaust silencer is installed inside the vent hole;

[0035] The air pump is powered by a battery.

[0036] Furthermore, the piston hammer impact assembly includes a circular upper mounting plate, a large buffer pad, an insulating ring, a small buffer pad, and a buffer pad retaining ring;

[0037] The upper mounting plate is fixed to the upper end of the calibration housing by N columns, and a calibration space is formed between the upper mounting plate and the upper end face of the calibration housing;

[0038] The large buffer pad, the conical target plate, and the insulating ring are arranged in the calibration space and are coaxially fixed to the edge of the upper mounting plate in sequence; the large buffer pad and the insulating ring are fitted onto each column through their edges; the large end of the conical target plate has a target plate edge along its circumference, and is fitted onto each column through the target plate edge.

[0039] The insulating ring is provided with multiple set bolts for mounting the sensor to be calibrated and the standard sensor;

[0040] The small buffer pad is coaxially mounted on the target surface of the conical target plate;

[0041] The buffer pad retaining ring is coaxially mounted around the upper port of the calibration housing, and its inner diameter matches the outer diameter of the small buffer pad.

[0042] Meanwhile, the present invention also provides a calibration method for a high-pressure gas-driven portable impact sensor, which employs the aforementioned high-pressure gas-driven portable impact sensor calibration device, characterized by comprising the following steps:

[0043] Step 1: Air is pumped into the lower cavity of the calibration housing. The gas enters through the first vent and passes through the second vent in the center of the substrate to impact the piston hammer located on the substrate.

[0044] Step 2: The piston hammer moves upward under the drive of the gas until its upper end passes through the upper opening of the calibration housing and collides with the target surface at the lower end of the piston hammer impact assembly, thereby impacting the sensor to be calibrated and the standard sensor installed on the edge of the piston hammer impact assembly, thus achieving sensor calibration.

[0045] Step 3: The gas located below the piston hammer is discharged through the vent hole on the side wall of the calibration housing, and the piston hammer falls back into place.

[0046] The beneficial effects of this invention are:

[0047] 1. The main structure of the calibration device of the present invention is circular and has axisymmetric characteristics. Under the impact of the piston hammer, the impact signals (acceleration, velocity, etc.) on the same ring on the outer circle of the piston hammer impact assembly are consistent, which can be used as the installation reference for the standard sensor and the sensor to be calibrated. The inner circle of the piston hammer impact assembly protrudes downward to form the target surface of the piston hammer, and the outer circle of the piston hammer impact assembly is the sensor mounting plane. The installation space is greatly increased, the number of sensors that can be calibrated at one time is increased, and the sensor calibration efficiency is improved.

[0048] 2. The present invention provides a compression spring and a magnet for the piston hammer, which makes the movement of the piston hammer smoother and also allows the piston hammer to return to its original position smoothly after impact.

[0049] 3. The present invention provides vertical and radial holes at the bottom of the piston hammer. While ensuring that the piston hammer can smoothly exhaust air after impact, it also increases the axial length of the piston hammer relative to the pneumatic housing. On the one hand, it increases the weight of the hammer itself, enabling it to return to its position smoothly. On the other hand, it also makes it easier to reduce the axial length of the pneumatic housing, thus reducing the size of the entire calibration device and making it easier to carry.

[0050] 4. The piston hammer impact assembly of the present invention is a stationary component relative to the piston hammer. Under the impact of the piston hammer, the movement amplitude of the calibration target plate is very small, the sensor cable will not generate obvious follow-up interference, and the cable will not be damaged.

[0051] 5. The piston hammer of the present invention impacts the calibration target plate by high-pressure gas, and the impact force is adjustable to meet the calibration requirements of most impact sensors. Furthermore, the sensor mounting part can be replaced as needed, thus broadening the application range of the calibration device.

[0052] 6. The main components of this invention are small in size, compact and lightweight, with no large auxiliary equipment. The air pump is battery-powered, making it easy to carry and suitable for temporary use in field tests.

[0053] 7. Existing drop hammer free-fall impacts generally require a certain height to achieve greater impact force, making the entire device occupy too much space during use, which is inconvenient for some small spaces. However, the present invention provides the impact force through an air pump, which does not require a large space and meets the needs of small space use. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a high-pressure gas-driven portable impact sensor calibration device of the present invention;

[0055] Figure 2 This is a partial structural schematic diagram of an embodiment of a high-pressure gas-driven portable impact sensor calibration device of the present invention;

[0056] Figure 3 for Figure 2 A structural decomposition diagram;

[0057] Figure 4 for Figure 2 Cross-sectional view;

[0058] Figure 5 This is an exploded view of the piston hammer impact assembly in an embodiment of the present invention.

[0059] Icon labels:

[0060] 1-Base, 2-First sealing ring, 3-Pneumatic housing, 4-Base plate, 5-Piston hammer, 6-Magnet, 7-Magnet fastening plate, 8-Second sealing ring, 9-Compression spring, 10-Inlet connector, 11-Outlet silencer, 12-Upper mounting plate, 13-Large buffer pad, 14-Conical target plate, 15-Insulating ring, 16-Small buffer pad, 17-Buffer pad retaining ring, 18-Setting bolt, 19-Solenoid valve, 20-Air pump, 21-Time controller, 22-Sensor. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] This invention provides a high-pressure gas-driven portable impact sensor calibration device, such as... Figures 1-4 As shown, it includes a piston hammer impact assembly, a cylindrical calibration housing disposed below the piston hammer impact assembly, a piston hammer 5 disposed inside the calibration housing, and an air pump 20 disposed outside the calibration housing; it also includes a ring-shaped magnet 6 and a magnet fastening plate 7, a compression spring 9, a solenoid valve 19, a time controller 21, and an exhaust silencer 11.

[0063] The piston hammer impact assembly is circular, with its lower edge used to mount a sensor 22. The sensor 22 includes a sensor to be calibrated and a standard sensor. Its central part has a downward-protruding conical target plate 14, with its smaller end facing downwards. This smaller end face is the target surface, which corresponds to the upper opening of the calibration housing. Specifically, as shown... Figure 5As shown, the piston hammer impact assembly includes a circular upper mounting plate 12, a large buffer pad 13, an insulating ring 15, a small buffer pad 16, and a buffer pad retaining ring 17. The upper mounting plate 12 is fixed to the upper end of the calibration housing by N columns, forming a calibration space between the upper mounting plate 12 and the upper end face of the calibration housing. The large buffer pad 13, the conical target plate 14, and the insulating ring 15 are sequentially arranged in the calibration space and are fixed to the edge of the upper mounting plate 12 from top to bottom. The large buffer pad 13 and the insulating ring 15 are connected by their respective... The edge is fitted onto each column; the large end of the conical target plate 14 has a target plate edge along its circumference, and the target plate edge is fitted onto each column; the large buffer pad 13 and the conical target plate 14 are fixedly connected to the upper mounting plate 12; the insulating ring 15 is provided with multiple set bolts 18 for installing the sensor to be calibrated and the standard sensor; the small buffer pad 16 is coaxially mounted on the target surface of the conical target plate 14; the buffer pad guard ring 17 is coaxially mounted around the upper port of the calibration housing, and its inner diameter matches the outer diameter of the small buffer pad 16.

[0064] The calibration housing includes a circular base 1 and a cylindrical pneumatic housing 3. The base 1 is located at the lower end of the pneumatic housing 3, and its outer circle is connected to the flange of the pneumatic housing 3. A cylindrical protrusion is provided at its center. The outer diameter of the protrusion matches the inner diameter of the second large hole, so that the protrusion can extend into the second large hole and fit tightly against the inner wall of the second large hole. A first sealing ring 2 is provided between the outer circle of the base 1 and the pneumatic housing 3. The bottom of the piston hammer 5 has a vertical hole along its axis, a radial hole communicating with the vertical hole along its radial direction, and an annular groove with both ends communicating with the radial hole along its circumference. When the piston hammer 5 contacts the target surface of the piston hammer impact assembly, the radial hole or the annular groove communicates with the vent hole to facilitate venting and return the piston hammer 5 to its position. Since the piston hammer 5 may rotate inside the pneumatic housing 3 during its movement, the radial hole and the vent hole may not be able to communicate. The annular groove avoids this problem, so that no matter how the piston hammer 5 rotates, the vertical hole and the radial hole can communicate with the vent hole through the annular groove, allowing the piston hammer 5 to return to its position smoothly.

[0065] Multiple second sealing rings 8 are embedded on the lower outer wall of the piston hammer 5. In this embodiment, three rings are provided, two of which are located above the radial hole and one is located below the radial hole. The inner cavity of the pneumatic housing 3 is a three-stage stepped hole, which includes, from bottom to top, a second large hole, a middle hole, and a second small hole arranged coaxially. A second step surface is formed between the second large hole and the middle hole, and a third step surface is formed between the middle hole and the second small hole. The middle hole and the second small hole form the upper cavity of the calibration housing. The second large hole is the calibration... The lower cavity of the housing has a vent hole on the side wall of the central hole and a first vent hole on the side wall of the second large hole. The base plate 4 is coaxially disposed in the second large hole, with its upper surface abutting against the second stepped surface. The outer ring is fixed to the calibration housing, and the inner ring is used to house the piston hammer 5. The center of the base plate 4 has a second vent hole. The outer wall of the piston hammer 5 has a shoulder, so that its lower outer wall is in clearance fit with the inner wall of the central hole, and its upper end is in clearance fit with the inner wall of the second small hole. The target surface of the piston hammer impact assembly corresponds to the second small hole. The compression spring 9 is fitted between the central hole of the calibration housing cavity and the piston hammer 5, with its upper end abutting against the third stepped surface and its lower end abutting against the shoulder on the outer wall of the piston hammer 5.

[0066] The piston hammer 5 has a two-stage stepped hole at its bottom, which includes a first large hole and a first small hole arranged coaxially from bottom to top; a first stepped surface is formed between the first large hole and the first small hole; a magnet 6 is installed in the first small hole; a magnet fastening plate 7 is installed in the first large hole, its upper surface abutting against the first stepped surface and fixed to the piston hammer 5, thereby pressing the magnet 6 onto the bottom of the piston hammer 5. The lower end face of the magnet fastening plate 7 is flush with the lower end face of the piston hammer 5; both the magnet 6 and the magnet fastening plate 7 are coaxial with the piston hammer 5, so that the center holes of both communicate with the second vent hole and the vertical hole, and the diameter of the center holes of both are the same as the diameter of the vertical hole. The base 1 or the base plate 4 is made of iron, and the magnet 6 can generate magnetic force on it, which facilitates the piston hammer 5 to return to its position.

[0067] The air pump 20 is connected to the first vent hole via the air inlet connector 10. The intermediate pipe is an airtight pipe. The solenoid valve 19 is located on the airtight pipe between the air pump 20 and the pneumatic housing 3. The air inlet connector 10 is threaded into the first vent hole. The air pump 20 is used to supply air to the downward cavity. The gas passes through the second vent hole and impacts the piston hammer 5, causing the piston hammer 5 to move upward and strike the target surface of the piston hammer impact assembly, thereby calibrating the sensor. The time controller 21 is electrically connected to the solenoid valve 19, and the solenoid valve 19 can be set and controlled through the time controller 21. The exhaust silencer 11 is installed in the vent hole. The air pump 20 is powered by a battery.

[0068] The method of using the above-mentioned high-pressure gas-driven portable impact sensor calibration device includes the following steps:

[0069] Step 1: Air is pumped into the lower cavity of the pneumatic housing 3, i.e., the second large hole, through the air pump 20. The gas enters from the first vent hole on the side wall of the lower cavity, passes through the second vent hole in the center of the substrate 4, and impacts the piston hammer 5 located on the substrate 4. At this time, since the lower end of the piston hammer 5 is in close contact with the inner wall of the hole in the pneumatic housing 3, the vertical hole and radial hole at its lower end are in a sealed state. Not only will there be no air leakage, but the stability of the piston hammer 5 moving upward will also be improved.

[0070] Step 2: The piston hammer 5 moves upward under the drive of the gas until its upper end passes through the second small hole at the upper end of the pneumatic housing 3 and collides with the lower end face of the conical target plate, i.e. the target surface, thereby impacting the sensor to be calibrated and the standard sensor installed on the edge of the piston hammer impact assembly, thus achieving sensor calibration.

[0071] Step 3: When the piston hammer 5 strikes the target surface, the radial hole of the piston hammer 5 connects with the vent hole on the side wall of the pneumatic housing 3. The high-pressure gas located below the piston hammer 5 is discharged sequentially through the central hole of the magnet 6 and the magnet fastening plate 7, the vertical hole and radial hole of the piston hammer 5, and the vent hole of the pneumatic housing 3. At the same time, the piston hammer 5 falls back into place under the elastic force of the compression spring 9, the attraction force of the magnet 6 on the base 1 or the base plate 4, and the weight of the piston hammer 5 itself, and sits on the base plate 4 again.

[0072] This invention uses high-pressure gas supplied by a solenoid-valve-controlled air pump as power to drive a sealed piston hammer at high speed. This piston hammer impacts a conical target plate, which has undergone a certain buffering process and houses a standard sensor and a sensor to be calibrated (mounted on the same ring), thus calibrating the sensor. When the piston hammer impacts the conical target plate, the high-pressure gas chamber connects to the pressure relief hole, reducing the pressure within the chamber. Under the influence of the spring force, magnetic force, and gravity, the piston hammer returns to its initial position and adheres to the base plate under magnetic force. The chamber is then isolated from the pressure relief hole by a sealing rubber ring, ensuring its airtightness. A timer controller adjusts the on / off time of the solenoid valve to regulate the gas pressure and time of the high-pressure gas entering the high-pressure chamber, thereby adjusting the range of the calibrated sensor.

[0073] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A portable impact sensor calibration device driven by high-pressure gas, characterized in that: It includes a piston hammer impact assembly, a cylindrical calibration housing located below the piston hammer impact assembly, a piston hammer (5) located inside the calibration housing, and an air pump (20) located outside the calibration housing. The piston hammer impact assembly is circular, and its lower edge is used to install a sensor (22). The sensor (22) includes a sensor to be calibrated and a standard sensor. The middle part is provided with a downwardly protruding conical target plate (14). The small end of the conical target plate (14) faces downward, and the end face of the small end is the target surface, which corresponds to the upper opening of the calibration housing. A base plate (4) is coaxially mounted inside the calibration housing cavity; the base plate (4) divides the calibration housing cavity into an upper cavity and a lower cavity; a vent hole is provided on the side wall of the upper cavity; a first vent hole is provided on the side wall of the lower cavity; and a second vent hole is provided at the center of the base plate (4). The piston hammer (5) is located in the upper cavity and sits on the base plate (4), with its sidewalls fitting with the inner wall of the calibration housing. The air pump (20) is connected to the first vent hole through the air inlet connector (10) for venting air into the downward cavity. The gas passes through the second vent hole and impacts the piston hammer (5), causing the piston hammer (5) to move upward and impact the target surface of the piston hammer impact assembly, thereby achieving sensor calibration. The piston hammer (5) has a vertical hole along its axis at its bottom, a radial hole communicating with the vertical hole along its radial direction, and an annular groove with both ends communicating with the radial hole along its circumference; when the piston hammer (5) contacts the target surface of the piston hammer impact assembly, the radial hole or the annular groove communicates with the vent hole.

2. The high-pressure gas-driven portable impact sensor calibration device according to claim 1, characterized in that: It also includes a magnet (6) that is in the shape of a circular ring and a magnet fastening plate (7); The piston hammer (5) has a two-stage stepped hole at the bottom, which includes a first large hole and a first small hole arranged coaxially from bottom to top; a first stepped surface is formed between the first large hole and the first small hole; The magnet (6) is installed in the first small hole; The magnet fastening plate (7) is installed in the first large hole, its upper surface abuts against the first step surface and is fixed to the piston hammer (5), thereby pressing the magnet (6) onto the bottom of the piston hammer (5); The magnet (6) and the magnet fastening plate (7) are both coaxial with the piston hammer (5), so that the center holes of both are connected to the second vent hole and the vertical hole; the lower end face of the magnet fastening plate (7) is flush with the lower end face of the piston hammer (5); The bottom of the calibration housing or the base plate (4) is made of iron.

3. The high-pressure gas-driven portable impact sensor calibration device according to claim 2, characterized in that: The inner cavity of the calibration housing is a three-stage stepped hole, which, from bottom to top, includes a second large hole, a middle hole, and a second small hole arranged coaxially. A second stepped surface is formed between the second large hole and the middle hole, and a third stepped surface is formed between the middle hole and the second small hole. The middle hole and the second small hole form the upper cavity of the calibration housing, and the second large hole forms the lower cavity of the calibration housing. The substrate (4) is disposed in the second large hole, its upper surface abuts against the second step surface, the outer ring is fixed to the calibration housing, and the inner ring is used to place the piston hammer (5). The piston hammer (5) has a shoulder on its outer wall, so that its lower outer wall is in clearance fit with the inner wall of the middle hole and its upper outer wall is in clearance fit with the inner wall of the second small hole. The target surface of the piston hammer impact assembly corresponds to the second small hole.

4. The high-pressure gas-driven portable impact sensor calibration device according to claim 3, characterized in that: It also includes a compression spring (9); The compression spring (9) is fitted between the central hole of the inner cavity of the calibration housing and the piston hammer (5), with its upper end abutting against the third step surface and its lower end abutting against the shoulder on the outer wall of the piston hammer (5).

5. The high-pressure gas-driven portable impact sensor calibration device according to claim 4, characterized in that: The calibration housing includes a circular base (1) and a cylindrical pneumatic housing (3). The base (1) is located at the lower end of the pneumatic housing (3), and its outer circle is connected to the flange of the pneumatic housing (3). A cylindrical protrusion is provided in the center. The outer diameter of the protrusion matches the inner diameter of the second large hole, so that the protrusion can extend into the second large hole and fit tightly against the inner wall of the second large hole. A first sealing ring (2) is provided between the outer circle of the base (1) and the pneumatic housing (3). Multiple second sealing rings (8) are embedded on the lower outer wall of the piston hammer (5).

6. The high-pressure gas-driven portable impact sensor calibration device according to claim 5, characterized in that: A portion of the multi-turn second sealing ring (8) is located above the radial hole, and another portion is located below the radial hole.

7. The high-pressure gas-driven portable impact sensor calibration device according to any one of claims 1-6, characterized in that: It also includes a solenoid valve (19), a time controller (21), and an exhaust silencer (11). The solenoid valve (19) is installed on the pipeline between the air pump (20) and the calibration housing; The time controller (21) is electrically connected to the solenoid valve (19); The exhaust silencer (11) is installed inside the vent hole; The air pump (20) is powered by a battery.

8. The high-pressure gas-driven portable impact sensor calibration device according to claim 7, characterized in that: The piston hammer impact assembly includes a circular upper mounting plate (12), a large buffer pad (13), an insulating ring (15), a small buffer pad (16), and a buffer pad retaining ring (17). The upper mounting plate (12) is fixed to the upper end of the calibration housing by N columns, and a calibration space is formed between the upper mounting plate (12) and the upper end face of the calibration housing; The large buffer pad (13), the conical target plate (14), and the insulating ring (15) are arranged in the calibration space and are coaxially fixed to the edge of the upper mounting plate (12) in sequence; the large buffer pad (13) and the insulating ring (15) are fitted onto each column through their edges; the large end of the conical target plate (14) is provided with a target plate edge along its circumference, and is fitted onto each column through the target plate edge; The insulating ring (15) is provided with a plurality of set bolts (18) for mounting the sensor to be calibrated and the standard sensor. The small buffer pad (16) is coaxially mounted on the target surface of the conical target plate (14); The buffer pad retaining ring (17) is coaxially mounted around the upper port of the calibration housing, and its inner diameter matches the outer diameter of the small buffer pad (16).

9. A calibration method for a high-pressure gas-driven portable impact sensor, employing the high-pressure gas-driven portable impact sensor calibration device according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Air is introduced into the lower cavity of the calibration housing through the air pump (20). The gas enters through the first vent hole and passes through the second vent hole in the center of the substrate (4) to impact the piston hammer (5) located on the substrate (4). Step 2: The piston hammer (5) moves upward under the drive of the gas until its upper end passes through the upper opening of the calibration housing and collides with the target surface at the lower end of the piston hammer impact assembly, thereby impacting the sensor to be calibrated and the standard sensor installed on the edge of the piston hammer impact assembly, and realizing sensor calibration. Step 3: The gas located below the piston hammer (5) is discharged through the vent hole on the side wall of the calibration housing, and the piston hammer (5) falls back into place.

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