Automatic piston type pressure gauge system and calibration method thereof

Abstract

The invention relates to a piston type pressure gauge, in particular to an automatic piston type pressure gauge system and a calibration method thereof. The weight increasing and decreasing device comprises a piston cylinder provided with a pressure input connector, a piston rod is slidably mounted in the piston cylinder, and a chassis is arranged at the end of the piston rod. The middle part of the upper surface of the chassis is provided with T-shaped weights which are sleeved from inside to outside in sequence; the small end of any T-shaped weight is sleeved with a tray, the lower surface of the tray is provided with a plurality of air cylinders which are evenly distributed in the circumferential direction, and output shafts of the air cylinders are connected with the lower surface of the tray. The output end of the air compressor is connected with a plurality of electromagnetic valves with the same number as the air cylinders, and the electromagnetic valves are connected with the air cylinders. The air compressor and the plurality of electromagnetic valves are connected with the control unit; a pressure sensor is arranged on the side portion of the piston cylinder and connected with the control unit. Compared with the traditional extensive operation of manually adding weights in batches, the device can realize the fine adjustment of pressure, accurately match various complex target pressure settings, and minimize the pressure application error.

Description

Technical Field

[0001] The present invention relates to a piston pressure gauge, and more particularly to an automatic piston pressure gauge system and a calibration method thereof. Background Art

[0002] A piston pressure gauge is a measuring instrument for pressure measurement based on the principle of hydrostatic equilibrium. It has stable performance and good reproducibility. It is mainly used as a pressure measurement standard for the transfer of quantity values, and can also be used in factory and mine metrology departments for the detection of pressure gauges and pressure transmitters. A piston pressure gauge generally consists of a piston system, special weights, and a calibrator mainframe.

[0003] Traditional piston pressure gauges require manual batch addition of weights and cannot achieve fine adjustment of pressure. Summary of the Invention

[0004] The object of the present invention is to solve the technical problem that traditional piston pressure gauges require manual batch addition of weights and cannot achieve fine adjustment of pressure, and to provide an automatic piston pressure gauge system and a calibration method thereof.

[0005] To solve the above technical problems, the technical solution provided by the present invention is as follows:

[0006] An automatic piston pressure gauge system includes a weight adding and subtracting device, an air compressor, and a control unit with a human-machine interface;

[0007] The weight adding and subtracting device includes a piston cylinder provided with a pressure input interface. A piston rod is slidably installed in the piston cylinder, and a chassis is provided at the end of the piston rod.

[0008] In the middle of the upper surface of the chassis, T-shaped weights are sleeved in sequence from inside to outside; a tray is sleeved on the small end of any T-shaped weight, and a plurality of cylinders evenly distributed in a circumference are provided on the lower surface of the tray. A base is sleeved outside the piston cylinder.

[0009] The cylinder block of the cylinder is connected to the base, and the output shaft of the cylinder is connected to the lower surface of the tray;

[0010] The output end of the air compressor is connected with a plurality of electromagnetic valves having the same number as the cylinders, and the working holes of the electromagnetic valves are connected with the cylinders; the air compressor and the plurality of electromagnetic valves are both connected to the control unit;

[0011] A pressure sensor for detecting the internal pressure of the piston cylinder is provided on the side of the piston cylinder, and the pressure sensor is connected to the control unit.

[0012] Further, the weights of the T-shaped weights increase in sequence from inside to outside;

[0013] Moreover, the weight of the T-shaped weight located at the center of the outer layer is 2 to the power of N-1 times the weight of the T-shaped weight located at the center, where N is the layer number where the T-shaped weight in the outer layer is located.

[0014] Furthermore, the stroke of the output shaft of the cylinder is 5 mm.

[0015] A calibration method for an automatic piston pressure gauge system includes the following steps:

[0016] S1. Set the pressure measurement unit and the pressure measurement range through the human-machine interface of the control unit in combination with the usage requirements.

[0017] S2. Select a pressure generating system. At the same time, connect the pressure output interface of the pressure generating system to the pressure input interface through a connecting pipeline.

[0018] S3. Connect the pressure generating system to the control unit and set the target pressure value through the human-machine interface of the control unit.

[0019] The control unit controls the pressure generating system to generate the corresponding pressure medium according to the target pressure value, and the pressure medium enters the piston cylinder through the connecting pipeline.

[0020] S4. At the same time, the control unit obtains the combination scheme of the T-shaped weights according to the target pressure value.

[0021] At the same time, the control unit controls the solenoid valves corresponding to the T-shaped weights recorded in the loading combination scheme to actuate and apply pressure to the chassis.

[0022] S5. The actual pressure in the piston cylinder is detected by the pressure sensor and uploaded to the control unit; and the control unit compares the actual pressure with the target pressure value.

[0023] If the error between the actual pressure and the target pressure value does not meet the standard, step S4 is executed again.

[0024] If the error between the actual pressure and the target pressure value meets the standard, the calibration of the automatic piston pressure gauge system is completed.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. For the automatic piston pressure gauge system and its calibration method provided by the present invention, since each weight can achieve precise movement, compared with the rough operation of adding weights manually in batches in the traditional way, this device can achieve fine adjustment of pressure. After obtaining the combination scheme of the T-shaped weights according to the target pressure value, the control unit controls the solenoid valves corresponding to the T-shaped weights recorded in the loading combination scheme to actuate simultaneously, which helps to accurately match various complex target pressure values, minimize the application error of the target pressure, and meet the requirements of high-precision metrological calibration.

[0027] 2. The automatic piston pressure gauge system and its calibration method provided by the present invention allow the device to quickly respond to different instructions. There is no need to move multiple weights one by one as in manual operation to obtain the appropriate pressure. Whether it is an increasing, decreasing or jump-type pressure change requirement, the weight adjustment can be completed in a short time, greatly improving the test efficiency.

[0028] 3. The automatic piston pressure gauge system and its calibration method provided by the present invention have high mechanical cylinder driving stability. As long as the air source is stable, the weight actions under the same instruction each time are extremely consistent, effectively avoiding the non-repeatability caused by differences in physical strength and techniques during manual operation, ensuring that each pressure test result has high repeatability, and enhancing the credibility of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural view of an embodiment of the present invention Figure 1 ;

[0030] Figure 2 is a schematic structural view of an embodiment of the present invention Figure 2 ;

[0031] Figure 3 is a schematic cross-sectional structural view of an embodiment of the present invention;

[0032] Figure 4 is a structural block diagram of an embodiment of the present invention.

[0033] Description of reference numerals: 1 - piston cylinder, 2 - piston rod, 3 - chassis, 4 - T-shaped weight, 5 - tray, 6 - cylinder, 7 - base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] As Figures 1 to 4 shown, an automatic piston pressure gauge system includes a weight adding and subtracting device, an air compressor, and a control unit with a human-machine interface;

[0036] The weight adding and subtracting device includes a piston cylinder 1 provided with a pressure input interface. A piston rod 2 is slidably installed in the piston cylinder 1, and a chassis 3 is provided at the end of the piston rod 2;

[0037] In the middle of the upper surface of the chassis 3, there are T-shaped weights 4 sleeved successively from inside to outside; the weights of the T-shaped weights 4 increase successively from inside to outside; and the weight of the T-shaped weight 4 at the center of the outer layer is 2 to the power of N-1 times the weight of the T-shaped weight 4 at the center, where N is the layer number where the T-shaped weight 4 in the outer layer is located.

[0038] On the small end of any T-shaped weight 4, there is a tray 5 sleeved. On the lower surface of the tray 5, there are a plurality of cylinders 6 evenly distributed in a circle. Outside the piston cylinder 1, there is a base 7 sleeved.

[0039] The cylinder body of the cylinder 6 is connected to the base 7, and the output shaft of the cylinder 6 is connected to the lower surface of the tray 5; the stroke of the output shaft of the cylinder 6 is 5 mm.

[0040] The output end of the air compressor is connected with a plurality of solenoid valves with the same number as the cylinders 6. The working holes of the solenoid valves are connected with the cylinders 6; the air compressor and the plurality of solenoid valves are both connected to the control unit.

[0041] On the side of the piston cylinder 1, there is a pressure sensor for detecting the internal pressure of the piston cylinder 1, and the pressure sensor is connected to the control unit.

[0042] In this embodiment, the control unit is used to receive the target pressure value set through the human-machine interface, obtain the combination scheme of the T-shaped weights according to the target pressure value, control the pressure generating system to generate the corresponding pressure medium according to the target pressure value; and can also receive the actual pressure detected by the pressure sensor and compare the actual pressure with the target pressure value.

[0043] The calibration method of the automatic piston type pressure gauge system provided by the present invention is as follows:

[0044] 1) Set the measurement unit of pressure and the pressure measurement range through the human-machine interface of the control unit in combination with the usage requirements.

[0045] The measurement unit can be MPa, kPa, bar, etc.

[0046] The pressure measurement range can be set according to the estimated value of the measured pressure. If the pressure value of the measured pressure is between 0-1 MPa, then the pressure measurement range is set to 0-1 MPa.

[0047] 2) Select the pressure generating system. At the same time, connect the pressure output interface of the pressure generating system to the pressure input interface through a connecting pipeline.

[0048] The pressure generating system is an intelligent pressure generating system, which can generate the pressure medium with the corresponding pressure according to the target pressure value.

[0049] 3) Connect the pressure generating system to the control unit and set the target pressure value through the human-machine interface of the control unit.

[0050] The control unit controls the pressure generating system to generate the corresponding pressure medium according to the target pressure value, and the pressure medium enters the piston cylinder 1 through the connecting pipeline;

[0051] 4) At the same time, the control unit obtains the combination plan of the T-shaped weights 4 according to the target pressure value;

[0052] At the same time, the control unit controls the solenoid valve corresponding to the T-shaped weight 4 recorded in the loading combination plan to act, so that the air compressor provides air source for the cylinder, the output shaft of the cylinder drives the tray to move downward, places the T-shaped weight on the chassis, and the T-shaped weight recorded in the combination plan exerts pressure on the chassis 3;

[0053] 5) The actual pressure in the piston cylinder 1 is detected by the pressure sensor and uploaded to the control unit; and the control unit compares the actual pressure with the target pressure value;

[0054] If the error between the actual pressure and the target pressure value does not meet the standard, step 4) is executed again;

[0055] If the error between the actual pressure and the target pressure value meets the standard, the calibration of the automatic piston pressure gauge system is completed.

[0056] When the pressure measurement range is 0-1 MPa, the configuration plan of the T-shaped weights is shown in Table 1.

[0057] Table 1: Configuration plan of T-shaped weights when the measurement range is 0-1 MPa

[0058]

[0059] If the pressure measurement range is set to 1-60 MPa, the configuration plan of the T-shaped weights is shown in Table 2.

[0060] Table 2: Configuration plan of T-shaped weights when the measurement range is 1-60 MPa

[0061]

[0062] If the pressure measurement range is set to 5-250 MPa, the configuration plan of the T-shaped weights is shown in Table 3.

[0063] Table 3: Configuration plan of T-shaped weights when the measurement range is 5-250 MPa

[0064]

[0065]

[0066] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described.

Claims

1. An automatic piston-type pressure gauge system, characterized in that: It includes an addition and subtraction code device, an air compressor, and a control unit with a human-machine interface; The addition and subtraction code device includes a piston cylinder (1) provided with a pressure input interface. A piston rod (2) is slidably installed in the piston cylinder (1), and a chassis (3) is provided at the end of the piston rod (2); In the middle of the upper surface of the chassis (3), T-shaped weights (4) are sleeved in sequence from inside to outside; A tray (5) is sleeved on the small end of any T-shaped weight (4). A plurality of cylinders (6) evenly distributed in a circle are provided on the lower surface of the tray (5). A base (7) is sleeved outside the piston cylinder (1); The cylinder body of the cylinder (6) is connected to the base (7), and the output shaft of the cylinder (6) is connected to the lower surface of the tray (5); The output end of the air compressor is connected with a plurality of solenoid valves with the same number as the cylinders (6). The working holes of the solenoid valves are connected to the cylinders (6); The air compressor and the plurality of solenoid valves are both connected to the control unit; A pressure sensor for detecting the internal pressure of the piston cylinder (1) is provided on the side of the piston cylinder (1), and the pressure sensor is connected to the control unit.

2. The automatic piston pressure gauge weight addition and subtraction device according to claim 1, characterized in that: The weights of the T-shaped weights (4) increase in sequence from inside to outside; And the weight of the T-shaped weight (4) at the center of the outer layer is 2 to the power of N-1 times the weight of the T-shaped weight (4) at the center, where N is the layer number where the outer T-shaped weight (4) is located.

3. The piston type pressure gauge automatic weight adding and subtracting device according to claim 1, characterized in that: The stroke of the output shaft of the cylinder (6) is 5 mm.

4. A calibration method for an automatic piston pressure gauge system, characterized in that, It includes the following steps: S1. Set the pressure measurement unit and the pressure measurement range through the human-machine interface of the control unit in combination with the usage requirements; S2. Select a pressure generating system. At the same time, connect the pressure output interface of the pressure generating system to the pressure input interface through a connecting pipeline; S3. Connect the pressure generating system to the control unit, and set the target pressure value through the human-machine interface of the control unit; The control unit controls the pressure generating system to generate corresponding pressure medium according to the target pressure value. The pressure medium enters the piston cylinder (1) through the connecting pipeline; S4. At the same time, the control unit obtains the combination scheme of the T-shaped weights (4) according to the target pressure value; At the same time, the control unit controls the solenoid valves corresponding to the T-shaped weights (4) recorded in the loading combination scheme to act, and applies pressure to the chassis (3); S5. The actual pressure in the piston cylinder (1) is detected by the pressure sensor and uploaded to the control unit; And the control unit compares the actual pressure with the target pressure value; If the error between the actual pressure and the target pressure value does not meet the standard, step S4 is executed again; If the error between the actual pressure and the target pressure value meets the standard, the calibration of the automatic piston pressure gauge system is completed.

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