Calibration device for contaminated hydraulic wrench and test method thereof

Abstract

The invention discloses a calibration device for a contaminated hydraulic wrench and a test method thereof. The calibration device for the contaminated hydraulic wrench comprises a test bench, an automatic control pump, a hydraulic shield pump, a data acquisition mechanism and a control system. According to the calibration device of the contaminated hydraulic wrench and the test method of the calibration device, through the arrangement of the automatic control pump, the adjustable and settable functions are achieved, automatic pressing is achieved, and the function of full-automatic calibration of the contaminated hydraulic wrench is achieved. And the hydraulic shield pump is used for physically isolating an oil path between the automatic control pump and the contaminated hydraulic wrench, so that the clean hydraulic oil is prevented from being in contact with the contaminated oil, and meanwhile, pressure supply is realized. The control system can set a pressure value required by calibration of the contaminated hydraulic wrench, the data acquisition mechanism acquires operation data parameters during calibration of the contaminated hydraulic wrench, and the control system can process the operation data parameters, so that full-automatic calibration of the contaminated hydraulic wrench is realized, and the calibration accuracy of the contaminated hydraulic wrench is improved. The calibration problem of the contaminated hydraulic wrench can be solved.

Description

Technical Field

[0001] The invention relates to the field of wrench detection, and in particular to a calibration device for a contaminated hydraulic wrench and a testing method thereof. Background Art

[0002] Hydraulic wrenches are used to install and remove bolts and nuts. They are lightweight, easy to carry, and simple to operate. They are widely used in various maintenance areas of nuclear power plants. Hydraulic wrenches are available in two types: square drive and hollow. They are used in conjunction with hydraulic pumps to achieve the purpose of tightening / removing bolts. Due to the special environment of the control area of ​​a nuclear power plant, some hydraulic wrenches have been contaminated by radioactive substances and cannot be removed from the control area, making it impossible to complete the traceability of the measurement value. At present, there is a lack of a calibration device that can simultaneously meet the calibration requirements of contaminated hydraulic wrenches and avoid contamination of personnel and equipment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a calibration device for a contaminated hydraulic wrench and a testing method thereof.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a calibration device for a contaminated hydraulic wrench, which includes a test bench, an automatic control pump, a hydraulic shielded pump, a data acquisition mechanism and a control system;

[0005] The test bench is used to install the contaminated hydraulic wrench;

[0006] The automatic control pump is connected to the hydraulic shielded pump through a first oil pipe and is used to control the input pressure of the contaminated hydraulic wrench;

[0007] The hydraulic shielded pump is connected to the contaminated hydraulic wrench through a second oil pipe and is used to isolate the contaminated hydraulic wrench and the automatic control pump;

[0008] The data acquisition mechanism is used to collect the operating data parameters of the contaminated hydraulic wrench during calibration;

[0009] The control system is communicatively connected with the automatic control pump, the hydraulic shielding pump and the data acquisition mechanism.

[0010] In some embodiments, the calibration device for the contaminated hydraulic wrench further includes a first control valve and a second control valve, wherein the first control valve is connected to the first oil pipe, and the second control valve is connected to the second oil pipe.

[0011] In some embodiments, the data acquisition mechanism includes a first pressure sensor and a second pressure sensor, the first pressure sensor is connected to the first control valve, and the second pressure sensor is connected to the second control valve.

[0012] In some embodiments, the data acquisition mechanism further includes a torque sensor mounted on the test bench.

[0013] In some embodiments, the control system includes a parameter setting module, a data processing module, and a display;

[0014] The parameter setting module is used to input calibration parameter information of the contaminated hydraulic wrench;

[0015] The data processing module is in communication with the data acquisition mechanism and is used to process the operating data parameters collected by the data acquisition mechanism;

[0016] The display is communicatively connected with the parameter setting module and the data processing module.

[0017] In this embodiment, a method for testing a contaminated hydraulic wrench is also constructed, which is based on the calibration device for the contaminated hydraulic wrench, and comprises the steps of:

[0018] S1: Install the contaminated hydraulic wrench on the test bench, physically isolate the contaminated hydraulic wrench from the torque sensor, connect the automatic control pump and the hydraulic shielding pump through the first oil pipe, and connect the contaminated hydraulic wrench and the hydraulic shielding pump through the second oil pipe;

[0019] S2: Open the parameter setting module, input the calibration parameter information of the contaminated hydraulic wrench, and set a plurality of target pressure calibration points, so that the contaminated hydraulic wrench maintains pressure for a preset time at each target pressure calibration point;

[0020] S3: After the pressure is stabilized, the operating data parameters of the contaminated hydraulic wrench are collected multiple times using a data collection mechanism;

[0021] S4: Processing and analyzing the operating data parameters using a data processing module to obtain a test curve regarding the target pressure calibration point and the operating data parameters, and calculating the relative error of the indication using the collected operating data parameters.

[0022] In some embodiments, the calibration parameter information includes system safety pressure, pressure holding accuracy, and response speed.

[0023] In some embodiments, the preset time is 5 to 10 seconds.

[0024] In some embodiments, step S3 includes:

[0025] S31: using the first pressure sensor to collect the pressure value of the pump station outlet of the automatic control pump;

[0026] S32: using the second pressure sensor to collect the canned pump outlet pressure value of the hydraulic canned pump;

[0027] S33: Using a torque sensor to collect and obtain the torque value of the contaminated hydraulic wrench.

[0028] In some embodiments, in step S4, the actual torque value measured corresponding to the target pressure check point is A, the nominal torque value corresponding to the target pressure check point is B, and the relative error of the indication is C, then C=(BA) / A*100%.

[0029] The implementation of the present invention has the following beneficial effects: the calibration device and the test method of the contaminated hydraulic wrench have adjustable and settable functions through the setting of the automatic control pump, realize automatic pressure, and realize the function of fully automatic calibration of the contaminated hydraulic wrench. And the hydraulic shielded pump is used to physically isolate the oil circuit between the automatic control pump and the contaminated hydraulic wrench to avoid contact between clean hydraulic oil and contaminated oil, and realize pressure supply at the same time. And the pressure value required for the calibration of the contaminated hydraulic wrench can be set by the control system, and the operating data parameters of the contaminated hydraulic wrench during calibration can be collected by the data acquisition mechanism. The control system can also process the operating data parameters, thereby realizing fully automatic calibration of the contaminated hydraulic wrench, which can solve the calibration problem of the contaminated hydraulic wrench, and ensure that personnel and equipment are not contaminated while completing the traceability of the contaminated hydraulic wrench value, so as to realize the traceability of the value of special measuring instruments in nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0031] Figure 1 Schematic diagram of the overall composition of a calibration device for a contaminated hydraulic wrench in some embodiments of the present invention. DETAILED DESCRIPTION

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0033] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0034] See also Figure 1 , is a calibration device for a contaminated hydraulic wrench in some embodiments of the present invention, which can not only ensure the traceability of the effective value of the contaminated hydraulic wrench, but also prevent personnel and standard instruments from being contaminated by radioactive substances. It includes a test bench 1, an automatic control pump 2, a hydraulic shielding pump 3, a data acquisition mechanism 4 and a control system 5. The test bench 1 is used to install the contaminated hydraulic wrench 6; the automatic control pump 2 is connected to the hydraulic shielding pump 3 through a first oil pipe 71, and is used to control the input pressure of the contaminated hydraulic wrench 6; the hydraulic shielding pump 3 is connected to the contaminated hydraulic wrench 6 through a second oil pipe 72, and is used to isolate the contaminated hydraulic wrench 6 and the automatic control pump 2; the data acquisition mechanism 4 is used to collect operating data parameters of the contaminated hydraulic wrench 6 during calibration; the control system 5 is communicatively connected to the automatic control pump 2, the hydraulic shielding pump 3 and the data acquisition mechanism 4.

[0035] Specifically, the test bench 1 is connected with universal wheels, so that the test bench 1 can be easily moved. The test bench 1 is provided with an adapter to facilitate the connection of the dirty hydraulic wrench 6, and is also provided with a reaction force arm support block, which has a strong anti-lateral force device and can withstand the reaction force of several tons of the dirty hydraulic wrench 6 without deforming the bench body. The size and strength of the test bench 1 can meet the calibration requirements of various types of dirty hydraulic wrenches 6.

[0036] The automatic control pump 2 can realize automatic pressure regulation, automatic bolt tightening, and return the tightening result to the control system 5. The automatic control pump 2 is composed of a motor, a plunger pump, a control valve, an oil tank, a cooler, an oil temperature and oil pressure sensor, an electric proportional pressure regulating valve, a remote control, etc. The automatic control pump 2 is also equipped with a proportional overflow safety valve, which can set the system safety pressure, and the safety pressure range is 1-70MPa. The automatic control pump 2 has the characteristics of high pressure, large flow, small volume, light weight, simple structure, and easy operation.

[0037] Furthermore, the hydraulic shielded pump 3 is arranged between the contaminated hydraulic wrench 6 and the automatic control pump 2, and can isolate the potential contaminated hydraulic oil in the contaminated hydraulic wrench 6 joint from the automatic control pump 2, and serve as a safety barrier to prevent the oil in the automatic control pump 2 from being contaminated. Its installation method is flange connection, which has a convenient disassembly function. After the hydraulic shielded pump 3 is disassembled, the automatic control pump 2 can still operate independently. The hydraulic shielded pump 3 is used to shield the first oil pipe 71 supplied by the automatic control pump 2 and the second oil pipe 72 of the contaminated hydraulic wrench 6, and the pressure supply can be guaranteed, so as to prevent the contaminated hydraulic oil from entering the automatic control pump 2 and causing contamination of the standard device.

[0038] The calibration device of the contaminated hydraulic wrench also includes a first control valve 81 and a second control valve 82, the first control valve 81 is connected to the first oil pipe 71, and the second control valve 82 is connected to the second oil pipe 72, and both the first control valve 81 and the second control valve 82 can be three-way valves. The data acquisition mechanism 4 includes a first pressure sensor 41 and a second pressure sensor 42, the first pressure sensor 41 is connected to the first control valve 81, and the second pressure sensor 42 is connected to the second control valve 82. The first pressure sensor 41 can collect the pump station outlet pressure value of the automatic control pump 2, and the second pressure sensor 42 can collect the shielded pump outlet pressure value of the hydraulic shielded pump 3. The pump station outlet pressure value and the shielded pump outlet pressure value should be consistent under normal circumstances. If there is an error between the pump station outlet pressure value and the shielded pump outlet pressure value, the hydraulic shielded pump 3 or the automatic control pump 2 needs to be adjusted.

[0039] The data acquisition mechanism 4 further includes a torque sensor 43 installed on the test bench 1 , and the torque sensor 43 can acquire the torque value of the contaminated hydraulic wrench 6 .

[0040] The control system 5 includes a parameter setting module, a data processing module and a display. The parameter setting module is used to input the calibration parameter information of the contaminated hydraulic wrench 6. The data processing module is communicated with the data acquisition mechanism 4 and is used to process the operating data parameters collected by the data acquisition mechanism 4. The display is communicated with the parameter setting module and the data processing module. The display can be used to display information of the parameter setting module and the data processing module, such as the pump station outlet pressure value, the shielded pump outlet pressure value, the torque value of the contaminated hydraulic wrench 6, and the pressure-torque comparison curve.

[0041] In this embodiment, a method for testing a contaminated hydraulic wrench 6 is also constructed, which is based on the calibration device for the contaminated hydraulic wrench, and comprises the following steps:

[0042] S1: Install the contaminated hydraulic wrench 6 on the test bench 1, and physically isolate the contaminated hydraulic wrench 6 from the torque sensor 43, connect the automatic control pump 2 and the hydraulic shielded pump 3 through the first oil pipe 71, and connect the contaminated hydraulic wrench 6 and the hydraulic shielded pump 3 through the second oil pipe 72;

[0043] S2: Open the parameter setting module, input the calibration parameter information of the contaminated hydraulic wrench 6, and set a plurality of target pressure calibration points, so that the contaminated hydraulic wrench 6 maintains the pressure for a preset time at each target pressure calibration point;

[0044] S3: After the pressure is maintained stable, the data acquisition mechanism 4 is used to collect the operating data parameters of the contaminated hydraulic wrench 6 for multiple times;

[0045] S4: Processing and analyzing the operating data parameters using a data processing module to obtain a test curve regarding the target pressure calibration point and the operating data parameters, and calculating the relative error of the indication using the collected operating data parameters.

[0046] In step S1, the contaminated hydraulic wrench 6 can be installed on the test bench 1, and the contaminated hydraulic wrench 6 is physically isolated from the torque sensor 43, the automatic control pump 2 and the hydraulic shielding pump 3 are connected through the first oil pipe 71, and the contaminated hydraulic wrench 6 and the hydraulic shielding pump 3 are connected through the second oil pipe 72. The sensors are powered and the data lines are connected. After the installation is completed, the test can be carried out. The pressure supply can be controlled by the automatic control pump 2, and the pressure is transmitted to the contaminated hydraulic wrench 6 through the 1:1 boost of the hydraulic shielding pump 3.

[0047] Among them, the calibration parameter information includes system safety pressure, pressure holding accuracy, and reaction speed, which can be set according to the calibration requirements of the contaminated hydraulic wrench 6. In addition, the parameter setting module can also be used to edit the name and model of the wrench being tested, and memorize and save it, so that the set test points can be automatically retrieved when calibrating the same model hydraulic wrench.

[0048] Further, in step S2, the preset time is 5 to 10 seconds. Specifically, the parameter setting module can be used to set multiple target pressure check points, automatically increase the pressure in stages, starting from 2000Psi, divided into 10 points, such as 2000Psi, 3000Psi, 4000Psi until 10000Psi, and maintain the pressure at each target pressure check point for 5 to 10 seconds. When the pressure is maintained for 5 seconds and is stable, the pressure and torque data are automatically collected 5 times (m 1 ;m 2 ;m 3 ;m 4 ;m 5 ), the average value of the data collected 5 times is taken as the torque value M corresponding to the pressure point. Repeat the same operation 3 times, and according to the measurement results of the 3 torque values ​​(M 1 , M 2 , M 3 ), calculate the average value M s , and then take the maximum value M among the three times max Subtract the minimum value M min , and then divided by the mean value M s It is the repeatability of indication R. R=(M max -M min ) / M s *100%. In addition, the parameter setting module also has the function of unit switching, such as Psi, bar, MPa, Nm and lbf.ft.

[0049] Step S3 includes: S31: using the first pressure sensor 41 to collect the pump station outlet pressure value of the automatic control pump 2; S32: using the second pressure sensor 42 to collect the shielded pump outlet pressure value of the hydraulic shielded pump 3; S33: using the torque sensor 43 to collect the torque of the contaminated hydraulic wrench 6. The above collected data can be displayed on the display, and the control system 5 can calculate the relative error of the indication value according to the collected operation data parameters.

[0050] In step S4, the actual torque value measured corresponding to the target pressure check point is A, the nominal torque value corresponding to the target pressure check point is B, and the relative error of the indication is C, then C = (BA) / A * 100%. The nominal torque value corresponding to the target pressure check point is the nominal value of the factory technical indicators of the contaminated hydraulic wrench 6. In a specific embodiment, if the corresponding torque nominal value is 2000Nm when the pressure check point is 2000psi, and the actual torque value measured by the torque sensor 43 is 2100Nm, then the relative error of the indication is (2000-2100) / 2100 * 100% = -4.7%.

[0051] It can be understood that the calibration device and test method of the contaminated hydraulic wrench have adjustable and settable functions through the setting of the automatic control pump 2, realize automatic pressure, and realize the function of fully automatic calibration of the contaminated hydraulic wrench 6. The hydraulic shielded pump 3 is used to physically isolate the oil circuit between the automatic control pump 2 and the contaminated hydraulic wrench 6 to avoid contact between clean hydraulic oil and contaminated oil, and at the same time realize pressure supply. The control system 5 can set the pressure value required for the calibration of the contaminated hydraulic wrench 6, and the data acquisition mechanism 4 can also collect the operating data parameters of the contaminated hydraulic wrench 6 during calibration. The control system 5 can also process the operating data parameters, thereby realizing the fully automatic calibration of the contaminated hydraulic wrench 6, which can solve the calibration problem of the contaminated hydraulic wrench 6, and ensure that personnel and equipment are not contaminated while completing the traceability of the contaminated hydraulic wrench 6, so as to realize the traceability of the special measuring instruments of the nuclear power plant.

[0052] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A calibration device for a contaminated hydraulic wrench, characterized in that: It comprises a test bench (1), an automatic control pump (2), a hydraulic canned pump (3), a data acquisition mechanism (4) and a control system (5); The test bench (1) is used to install a contaminated hydraulic wrench (6); The automatic control pump (2) is connected to the hydraulic shielded pump (3) via a first oil pipe (71) and is used to control the input pressure of the contaminated hydraulic wrench (6); The hydraulic shielded pump (3) is connected to the contaminated hydraulic wrench (6) through a second oil pipe (72) and is used to isolate the contaminated hydraulic wrench (6) and the automatic control pump (2); The data acquisition mechanism (4) is used to collect operating data parameters of the contaminated hydraulic wrench (6) during calibration; The control system (5) is communicatively connected with the automatic control pump (2), the hydraulic shielded pump (3) and the data acquisition mechanism (4).

2. The calibration device for a contaminated hydraulic wrench according to claim 1, characterized in that: The contaminated hydraulic wrench calibration device further comprises a first control valve (81) and a second control valve (82), wherein the first control valve (81) is connected to the first oil pipe (71), and the second control valve (82) is connected to the second oil pipe (72).

3. The calibration device for a contaminated hydraulic wrench according to claim 2, characterized in that: The data acquisition mechanism (4) comprises a first pressure sensor (41) and a second pressure sensor (42), wherein the first pressure sensor (41) is connected to the first control valve (81), and the second pressure sensor (42) is connected to the second control valve (82).

4. The calibration device for a contaminated hydraulic wrench according to claim 1, characterized in that: The data acquisition mechanism (4) also includes a torque sensor (43) installed on the test bench (1).

5. The calibration device for a contaminated hydraulic wrench according to claim 1, characterized in that: The control system (5) comprises a parameter setting module, a data processing module and a display; The parameter setting module is used to input calibration parameter information of the contaminated hydraulic wrench (6); The data processing module is in communication connection with the data acquisition mechanism (4) and is used to process the operating data parameters collected by the data acquisition mechanism (4); The display is communicatively connected with the parameter setting module and the data processing module.

6. A method for testing a contaminated hydraulic wrench, based on the contaminated hydraulic wrench calibration device according to any one of claims 1 to 5, characterized in that: Includes steps: S1: Install the contaminated hydraulic wrench (6) on the test bench (1), physically isolate the contaminated hydraulic wrench (6) from the torque sensor (43), connect the automatic control pump (2) and the hydraulic shielded pump (3) through the first oil pipe (71), and connect the contaminated hydraulic wrench (6) and the hydraulic shielded pump (3) through the second oil pipe (72); S2: opening a parameter setting module, inputting calibration parameter information of the contaminated hydraulic wrench (6), and setting a plurality of target pressure calibration points, so that the contaminated hydraulic wrench (6) maintains pressure for a preset time at each target pressure calibration point; S3: After the pressure is maintained stable, the operating data parameters of the contaminated hydraulic wrench (6) are collected multiple times using the data collection mechanism (4); S4: Processing and analyzing the operating data parameters using a data processing module to obtain a test curve regarding the target pressure calibration point and the operating data parameters, and calculating the relative error of the indication using the collected operating data parameters.

7. The method for testing a contaminated hydraulic wrench according to claim 6, characterized in that: The calibration parameter information includes system safety pressure, pressure maintaining accuracy, and response speed.

8. The method for testing a contaminated hydraulic wrench according to claim 6, characterized in that: The preset time is 5 to 10 seconds.

9. The method for testing a contaminated hydraulic wrench according to claim 6, characterized in that: Step S3 includes: S31: using a first pressure sensor (41) to collect and obtain a pump station outlet pressure value of an automatic control pump (2); S32: using a second pressure sensor (42) to collect and obtain a canned pump outlet pressure value of the hydraulic canned pump (3); S33: Using the torque sensor (43) to collect and obtain the torque value of the contaminated hydraulic wrench (6).

10. The method for testing a contaminated hydraulic wrench according to claim 6, characterized in that: In step S4, the actual torque value measured corresponding to the target pressure check point is A, the nominal torque value corresponding to the target pressure check point is B, and the relative error of the indication is C, then C=(BA) / A*100%.

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