Pluggable air pressure measurement and control device and measurement and control method

Abstract

The invention discloses a plug-in type air pressure measurement and control device and a measurement and control method, and belongs to the technical field of mechanical measurement. The problem that an air pressure measurement and control module in an existing air pressure controller cannot be detached is solved. The plug-in type air pressure measurement and control device comprises a shell, a supporting seat, a measurement and control circuit board, a mounting connecting piece and a mounting groove, the measurement and control circuit board is fixed to the bottom face of the installation cavity, the installation connecting piece is arranged on the outer wall of the shell and matched with the installation groove, and the installation groove is formed in the air pressure controller box. When the air pressure regulation and control range needs to be changed, under the condition that the whole air pressure controller does not need to be replaced, an operator selects the plug-in type air pressure measurement and control device of the target air pressure range according to needs and installs the plug-in type air pressure measurement and control device in the box body, and operation is simple and rapid.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical metrology, and in particular to a plug-in type air pressure measurement and control device and a measurement and control method. Background Art

[0002] The air pressure controller is a machine that adjusts and controls air pressure, which includes a box and an air pressure measurement and control module. The box is used to carry the air pressure measurement and control module, and the air pressure measurement and control module is used to measure and control air pressure. The air pressure measurement and control module in the existing air pressure controller is integrated with the box, that is, the air pressure measurement and control module cannot be removed from the box. Summary of the invention

[0003] In view of the above analysis, the present invention aims to provide a plug-in air pressure measurement and control device and a measurement and control method to solve the problem that the air pressure measurement and control module in the existing air pressure controller cannot be disassembled.

[0004] The purpose of the present invention is mainly achieved through the following technical solutions:

[0005] On the one hand, the present invention provides a plug-in type air pressure measurement and control device, a housing, a support seat, a measurement and control circuit board, a mounting connector and a mounting slot;

[0006] The housing and the support seat are connected to form a mounting cavity;

[0007] The measurement and control circuit board is fixed on the bottom surface of the shell;

[0008] The mounting connector is arranged on the outer wall of the shell and matches the mounting groove, and the mounting groove is arranged on the box body of the air pressure controller.

[0009] Furthermore, it also includes a sensor and a reference sensor, and a gas cavity is set in the support base; the sensor and the reference sensor are set in the installation cavity and fixedly connected to the support base; the test end of the sensor and the test end of the reference sensor are set in the gas cavity.

[0010] Further, the support seat includes two ears, and the ears protrude from the shell.

[0011] Furthermore, a first connecting member and a second connecting member are provided on the supporting ear.

[0012] On the other hand, the present invention provides a measurement and control method, which uses the above-mentioned plug-in type air pressure measurement and control device to measure and control the air pressure of the measured object, comprising:

[0013] S1, establishing a communication connection between the plug-in air pressure measurement and control device and the air pressure controller;

[0014] S2, establishing an air path between the plug-in air pressure measurement and control device and the measured object;

[0015] S3, obtaining a rate of change of the air pressure in the air circuit during the regulation process based on the target air pressure to which the tested object is regulated, the air pressure in the air circuit before the air pressure regulation, and the regulation time;

[0016] S4, by adjusting the air intake and exhaust volumes, the real-time air pressure in the air circuit changes with the air pressure change rate in the air circuit until the real-time air pressure in the air circuit is equal to the target pressure, thereby completing the air pressure regulation of the test piece.

[0017] Furthermore, before S1, it also includes:

[0018] S0, determine the target air pressure to which the measured object is adjusted, and select the plug-in air pressure measurement and control device corresponding to the air pressure range that meets the target air pressure.

[0019] Furthermore, the plug-in air pressure measurement and control device includes a measurement and control circuit board; the air pressure controller box includes a main control circuit board;

[0020] The communication connection in S1 is specifically: the measurement and control circuit board is communicated with the main control circuit board.

[0021] Further, the gas circuit includes a gas source, a second pipeline, a third pipeline, a fourth pipeline, a gas pressure output interface, an exhaust interface, an air intake interface and a gas cavity, and the gas cavity is provided with a gas pressure output interface, an exhaust interface and an air intake interface;

[0022] S2 is specifically: the air pressure output interface is connected to the inside of the tested object through the second pipeline, the exhaust interface is connected to the air source through the third pipeline, and the air intake interface is connected to the air source through the fourth pipeline.

[0023] Furthermore, in S3, the air pressure in the air path is measured by a silicon resonant sensor before air pressure regulation.

[0024] Furthermore, in S3, the real-time air pressure in the air path is measured by a piezoresistive sensor.

[0025] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0026] 1. A plug-in air pressure measurement and control device of the present invention includes a shell, a support seat, a measurement and control circuit board, a mounting connector and a mounting slot; the shell and the support seat are connected to form a mounting cavity; the measurement and control circuit board is fixed to the bottom surface of the shell, and the mounting connector is arranged on the outer wall of the shell and matches the mounting slot, and the mounting slot is arranged on the box of the air pressure controller. Because the mounting connector and the mounting slot are arranged, the detachable connection between the plug-in air pressure measurement and control device and the box of the gas pressure controller is realized. Because the plug-in air pressure measurement and control device and the gas pressure controller box are detachably connected and each plug-in air pressure measurement and control device has a unique range, when the air pressure control range needs to be changed, the operator selects the plug-in air pressure measurement and control device of the target air pressure range as needed and installs it in the box, which is simple and quick to operate.

[0027] 2. A plug-in air pressure measuring and control device of the present invention is small in size and light in weight. When replacing a plug-in air pressure measuring and control device of one range to a plug-in air pressure measuring and control device of another range, it is only necessary to dismantle the plug-in air pressure measuring and control device installed in the air pressure controller box, and then install the plug-in air pressure measuring and control device of the required range. It is only necessary to move the small and light plug-in air pressure measuring and control device without moving the box, which makes replacement simple, saves time and effort, and improves work efficiency.

[0028] 3. This application only needs to be equipped with a box that matches the plug-in air pressure measurement and control device and a plug-in air pressure measurement and control device of the required range to achieve air pressure regulation. Since there is no need to purchase an air pressure controller as a whole machine, the equipment purchase funds are directly reduced.

[0029] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0031] Figure 1 It is a structural schematic diagram of a plug-in type air pressure measurement and control device;

[0032] Figure 2 for Figure 1 Schematic diagram of the structure of the support seat shaft side in the plug-in type air pressure measurement and control device Figure 1 ;

[0033] Figure 3 for Figure 1 Schematic diagram of the structure of the support seat shaft side in the plug-in type air pressure measurement and control device Figure 2 ;

[0034] Figure 4 A schematic diagram of the structure of a gas pressure controller for installing a plug-in gas pressure measurement and control device;

[0035] Reference numerals:

[0036] 1-housing, 2-measurement and control circuit board, 3-support seat, 4-sensor, 5-reference sensor, 6-solenoid valve group, 8-electrical interface, 9-gas chamber, 10-plug-in air pressure measurement and control device, 101-installation connector;

[0037] 12- first side, 13- second side, 14- third side;

[0038] 31- ear, 311- first connecting piece, 312- second connecting piece;

[0039] 32-support block;

[0040] 61-reference solenoid valve, 62-air pressure output solenoid valve, 63-exhaust solenoid valve, 64-intake solenoid valve;

[0041] 71-reference interface, 72-air pressure output interface, 73-exhaust interface, 74-air intake interface;

[0042] 20-gas pressure controller housing, 201-main control circuit board, 202-installation slot, 205-rear panel, 206-socket. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0044] Example 1

[0045] This embodiment provides a plug-in type air pressure measurement and control device, such as Figures 1 to 4 As shown, it includes a shell 1, a measurement and control circuit board 2, a support seat 3, a mounting connector 101 and a mounting groove 202. The shell 1 and the support seat 3 are connected to form a mounting cavity; the measurement and control circuit board 2 is fixed to the bottom surface of the shell 1, the mounting connector 101 is arranged on the outer wall of the shell 1 and matches the mounting groove 202, the mounting groove 202 is arranged on the air pressure controller box 20, and each plug-in air pressure measurement and control device 10 has a unique range.

[0046] In one aspect of this embodiment, the plug-in air pressure measurement and control device 10 is detachably connected to the gas pressure controller housing 20 by matching the mounting connector 101 with the mounting groove 202 .

[0047] On the other hand, in this embodiment, since each plug-in air pressure measuring and control device 10 has a unique range, a gas pressure controller box 20 is equipped with multiple plug-in air pressure measuring and control devices 10, and the ranges of any two plug-in air pressure measuring and control devices 10 are different. Therefore, during the air pressure regulation process, the operator selects the plug-in air pressure measuring and control device 10 of the required range as needed and installs it in the gas pressure controller box 20. This allows the operator to complete multi-range air pressure regulation by replacing plug-in air pressure measuring and control devices 10 of different ranges without replacing the entire gas pressure controller. The operation is simple and quick, thereby improving work efficiency.

[0048] Furthermore, it also includes a sensor 4 and a reference sensor 5, and a gas cavity 9 is set in the support base 3; the sensor 4 and the reference sensor 5 are set in the installation cavity and fixedly connected to the support base 3; the test end of the sensor 4 and the test end of the reference sensor 5 are set in the gas cavity 9.

[0049] It should be noted that:

[0050] About sensor 4: sensor 4 is connected to the measurement and control circuit board 2 through the RS485 interface, such as Figure 2 As shown, the measuring end of the sensor 4 is arranged in the gas cavity 9. The high-precision sensor 4 measures the air pressure inside the gas cavity 9 based on the instruction of the measurement and control circuit board 2, and feeds back the measured air pressure value to the measurement and control circuit board 2. The sensor 4 is preferably a silicon resonant pressure sensor, which ensures that the accuracy of the air pressure measurement and control device can reach 0.01 level, and realizes high-precision collection and output.

[0051] About reference sensor 5: Reference sensor 5 is connected to measurement and control circuit board 2 via RS485 interface. Figure 2 As shown, the measuring end of the reference sensor 5 is arranged in the gas cavity 9. The reference sensor 5 measures the real-time air pressure inside the gas cavity 9, and feeds back the measured real-time air pressure value to the measurement and control circuit board 2. The reference sensor 5 is preferably a piezoresistive sensor, and its response time can reach 1ms level, which improves the control speed of the air pressure measurement and control device and realizes the rapid acquisition of the air pressure value.

[0052] Furthermore, if Figure 2 and Figure 3 As shown, the housing 1 is a box structure with a side opening; the support seat 3 is connected to the side opening of the box structure to form a mounting cavity, and the support seat 3 includes a support ear 31 and a support block 32, and the support ear 31 is fixedly connected to the support block 32. The support ear 31 is used to connect the housing 1 and the gas pressure controller box 20.

[0053] It should be noted that: Figure 3 As shown, the ear 31 is provided with a first connection member 311 and a second connection member 312. The first connection member 311 is detachably connected to the side opening on the housing 1, specifically: the first connection member 311 is respectively connected to the sides of the first side 12 and the second side 13. The second connection member 312 is detachably connected to the box body 20, specifically: the second connection member 312 is connected to the socket 206 on the box body of the air pressure controller.

[0054] It should also be noted that: the sensor 4, the reference sensor 5 and the electromagnetic valve group 6 are arranged on the side of the support block 32 facing the installation cavity. The interface group is arranged on the side of the support block 32 opposite to the installation cavity. The gas cavity 9 is arranged inside the support block 32.

[0055] Furthermore, if Figure 1As shown, the plug-in air pressure measurement and control device 10 also includes a solenoid valve group 6, an interface and a gas chamber 9; the solenoid valve group 6 is arranged in the installation chamber, fixedly connected to the support seat 3, and is in communication connection with the measurement and control circuit board 2; the gas chamber 9 is arranged in the support seat 3, and is in communication with the interface arranged on the support seat 3. The interface includes a reference interface, an air pressure output interface, an exhaust interface and an air intake interface. The support seat 3 is used to support and fix the sensor 4, the reference sensor 5, the solenoid valve group 6 and the interface on the one hand, and on the other hand, provides a mounting surface for each interface in communication with the gas chamber 9.

[0056] Furthermore, if Figure 2 As shown, the solenoid valve group 6 includes two height solenoid valves and two low-speed solenoid valves, specifically: the two height solenoid valves are a reference solenoid valve 61 and an air pressure output solenoid valve 62; the two low-speed solenoid valves are an exhaust solenoid valve 63 and an intake solenoid valve 64. Each solenoid valve in the solenoid valve group 6 is used to control the ventilation volume of each interface. It should be noted that the measurement and control circuit board 2 is connected to the solenoid valve group 6 to control the opening and closing of each solenoid valve in the solenoid valve group 6.

[0057] It should be noted that the precise air pressure control technology based on the high-speed solenoid valve realizes stable air pressure output. Specifically, the high-speed solenoid valve has two extreme working modes of open and closed. When the high-speed switch solenoid valve receives a pulse signal, the high-speed switch solenoid valve completes a fast switch action. Pressure control is achieved by adjusting the ratio of the high-speed solenoid valve on and off within a cycle. Since the carrier signal period of the high-speed switch solenoid valve is very small, the average flow rate can be used to represent the output flow rate within a cycle. After the pulse width regulation is fully refined, the average opening change of the valve between adjacent drawing cycles is very small, which can be regarded as continuous control, thereby achieving fine-tuning and micro-control of the air path.

[0058] Furthermore, if Figure 2 and Figure 3 As shown, the interface includes a reference interface 71, an air pressure output interface 72, an exhaust interface 73 and an air intake interface 74. The solenoid valve group 6 includes a reference solenoid valve 61, an air pressure output solenoid valve 62, an exhaust solenoid valve 63 and an air intake solenoid valve 64. Each interface is arranged on the gas cavity 9 and communicated with the gas cavity 9. One end of each interface is connected to a solenoid valve, and the other end is opened on the support block 32 for connecting the test piece.

[0059] More specifically:

[0060] The reference interface 71 is in communication with the gas chamber 9 and is provided with a reference solenoid valve 61. The reference sensor 5 is used to collect the real-time gas pressure value inside the measured object at high speed.

[0061] The air pressure output solenoid valve 62 is provided at the air pressure output interface 72, and the air pressure output interface 72 is connected to the inside of the measured object through the second pipeline. The air pressure output solenoid valve 62 controls the air flow of the air pressure output interface 72, and outputs the gas in the gas cavity 9 to the inside of the measured object through the second pipeline, so that the air pressure inside the measured object is equal to the target air pressure set by the operator.

[0062] An exhaust solenoid valve 63 is provided at the exhaust interface 73, and the exhaust interface 73 is connected to the air pump or standard gas through the third pipeline. The exhaust solenoid valve 63 controls the exhaust volume of the exhaust interface 73, and the gas in the gas cavity 9 is discharged to the air pump or standard gas through the third pipeline.

[0063] An air inlet solenoid valve 64 is provided at the air inlet interface 74, and the air inlet interface 74 is connected to the air pump or standard gas through the fourth pipeline. The air inlet solenoid valve 64 controls the air intake of the air inlet interface 74, and the gas in the air pump or standard gas is input into the gas chamber 9 through the fourth pipeline.

[0064] Furthermore, if Figure 1 As shown, the plug-in gas pressure measurement and control device 10 also includes an electrical connector 8. Through the electrical connector 8, the measurement and control circuit board 2 of the plug-in gas pressure measurement and control device installed in the gas pressure controller is connected to the main control circuit board 201 installed in the gas pressure controller box 20 to communicate.

[0065] Furthermore, if Figure 1 As shown, the housing 1 is a box structure with an open side, which is used to carry various components in the plug-in air pressure measurement and control device 10.

[0066] The housing 1 is a box structure with a side opening, which includes a bottom surface, a first side surface 12, a second side surface 13, a third side surface 14 and a top surface; the bottoms of the first side surface 12, the second side surface 13 and the third side surface 14 are all connected to the bottom surface, and the tops of the first side surface 12, the second side surface 13 and the third side surface 14 are all connected to the top surface 15; the first side surface 12 and the second side surface 13 are arranged opposite to each other, and the third side surface 14 is connected between the first side surface 12 and the second side surface 13. Among them, a measurement and control circuit board 2 is arranged on the bottom surface. The first side surface 12 and the second side surface 13 are both provided with heat dissipation ports for discharging the heat inside the plug-in air pressure measurement and control device.

[0067] Example 2

[0068] This embodiment is a method for measuring and controlling air pressure of a device under test according to the plug-in air pressure measuring and controlling device of Embodiment 1, comprising:

[0069] S201, determining the target air pressure to which the tested object is adjusted, and selecting a plug-in air pressure measurement and control device corresponding to the air pressure range that meets the target air pressure;

[0070] S202, establishing a communication connection between the plug-in air pressure measurement and control device and the air pressure controller;

[0071] S203, establishing a connection between the device under test and the gas pressure controller, including:

[0072] An air circuit is established between the tested object and the gas pressure controller, and the air circuit includes: an air pump or standard gas, a second pipeline, a third pipeline, a fourth pipeline, a reference interface 71, an air pressure output interface 72, an exhaust interface 73, an air intake interface 74 and a gas chamber 9; specifically, a reference interface 71, an air pressure output interface 72, an exhaust interface 73 and an air intake interface 74 are arranged on the gas chamber 9; the air pressure output interface 72 is connected to the inside of the tested object through the second pipeline, the exhaust interface 73 is connected to the air pump or standard gas through the third pipeline, and the air intake interface 74 is connected to the air pump or standard gas through the fourth pipeline. The air circuit design ensures that the inside of the tested object and the inside of the gas chamber are in a mutually ventilated state;

[0073] S204, the main control circuit board sends an instruction to adjust the measured object to the target air pressure to the measurement and control circuit board;

[0074] S205, the measurement and control circuit board controls and receives the air pressure in the air path before air pressure regulation measured by the silicon resonant sensor 4;

[0075] S206, based on the air pressure in the air circuit before air pressure regulation, the target air pressure and the regulation time, the corresponding pressure change rate is obtained, and then the plug-in air pressure measurement and control device controls the solenoid valve group as an actuator to intake and exhaust air until the real-time air pressure in the air circuit is the same as the target air pressure. Specifically: based on the air pressure in the air circuit before air pressure regulation, the target air pressure and the regulation time, the change rate of the real-time air pressure in the air circuit during the regulation process is obtained, and the pressure difference between the air pressure in the air circuit before air pressure regulation and the target air pressure is converted into a corresponding PWM (Pulse Width Modulation) signal through FPGA (Field Programmable Gate Array) and output to the solenoid valve group. The solenoid valve group acts as an actuator to adjust the intake and exhaust volume, so that the real-time pressure in the air circuit changes with the change rate, wherein the control regulation includes the first regulation situation and the second regulation situation.

[0076] The first adjustment situation is: when the detected air pressure is less than the target set pressure, the output control solenoid valve group increases the intake air to increase the predetermined air pressure by reducing the control according to the real-time value of the piezoresistive sensor and the corresponding pressure change rate.

[0077] The second adjustment situation is: when the detected air pressure is greater than the target set pressure, the output control solenoid valve group increases the control according to the real-time value of the piezoresistive sensor and the corresponding pressure change rate to reduce the intake air to a predetermined pressure reduction signal.

[0078] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A plug-in air pressure measurement and control device, characterized in that: It includes a housing, a support seat, a measurement and control circuit board, a mounting connector and a mounting slot; The housing and the support seat are connected to form a mounting cavity; The measurement and control circuit board is fixed to the bottom surface of the housing; The mounting connector is arranged on the outer wall of the shell and matches the mounting groove, and the mounting groove is arranged on the box body of the air pressure controller.

2. The device according to claim 1, characterized in that: Also included are a sensor and a reference sensor, wherein a gas cavity is provided in the support seat; The sensor and the reference sensor are arranged in the installation cavity and fixedly connected to the support seat; The test end of the sensor and the test end of the reference sensor are arranged in the gas cavity.

3. The device according to claim 1, characterized in that: The support base includes two ears, and the ears protrude from the shell.

4. The device according to claim 3, characterized in that: The support ear is provided with a first connecting piece and a second connecting piece.

5. A method for measuring and controlling air pressure, characterized in that: The plug-in type air pressure measurement and control device according to any one of claims 1 to 4 is used to measure and control the air pressure of the tested object, comprising: S1, establishing a communication connection between the plug-in air pressure measurement and control device and the air pressure controller; S2, establishing an air path between the plug-in air pressure measurement and control device and the measured object; S3, obtaining a rate of change of the air pressure in the air circuit during the regulation process based on the target air pressure to which the tested object is regulated, the air pressure in the air circuit before the air pressure regulation, and the regulation time; S4, by adjusting the air intake and exhaust volumes, the real-time air pressure in the air circuit changes with the air pressure change rate in the air circuit until the real-time air pressure in the air circuit is equal to the target pressure, thereby completing the air pressure regulation of the test piece.

6. The method according to claim 5, characterized in that: The S1 also includes: S0, determining the target air pressure to which the measured object is adjusted, and selecting a plug-in air pressure measurement and control device corresponding to an air pressure range that meets the target air pressure.

7. The method according to claim 5, characterized in that: The plug-in air pressure measurement and control device includes a measurement and control circuit board; the box of the air pressure controller includes a main control circuit board; In S1, the communication connection specifically includes: the measurement and control circuit board is communicatively connected with the main control circuit board.

8. The method according to claim 5, characterized in that: The gas circuit includes a gas source, a second pipeline, a third pipeline, a fourth pipeline, a gas pressure output interface, an exhaust interface, an air intake interface and a gas cavity, and the gas cavity is provided with the gas pressure output interface, the exhaust interface and the air intake interface; Specifically, S2 is as follows: the air pressure output interface is connected to the interior of the tested object through the second pipeline, the exhaust interface is connected to the air source through the third pipeline, and the air intake interface is connected to the air source through the fourth pipeline.

9. The method according to claim 5, characterized in that: In S3, the air pressure in the air path is measured by a silicon resonant sensor before the air pressure regulation.

10. The method according to claim 5, characterized in that: In S4, the real-time air pressure in the air path is measured by a piezoresistive sensor.

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