An experimental device for shunt accuracy calibration test

Abstract

The present invention discloses an experimental device for calibrating and testing the accuracy of a shunt, which includes: a device body, a driving component and an automated detection component. The device body is provided with a containing chamber, and the automated detection component is contained in the containing chamber. The automated detection component includes: a fixed pedestal, a supporting rotating frame, a fixture disk assembly, an intermittent connection test assembly and a shielding cover. The fixture disk assembly includes: an upper plate, a lower plate and a plurality of intermediate holders. There is a gap between the upper plate and the lower plate, and the two cooperate to form a plurality of fixture slots. The plurality of fixture slots are distributed in a circular array with the rotating shaft of the supporting rotating frame as the center. The plurality of intermediate holders are respectively arranged in the plurality of fixture slots, and the intermediate holders are used to clamp and electrically connect the shunt. The intermittent connection test assembly is electrically connected or separated from the intermediate holder. The experimental device can conveniently and quickly perform calibration tests on a plurality of shunts, reduce the probability of errors while reducing labor costs, thereby improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of testing devices, and in particular to an experimental device for shunt accuracy calibration testing. Background Art

[0002] The shunt is the main sensor for current measurement. Its function is to convert the current signal into a voltage signal within a certain range based on Ohm's law. During the use of the shunt, due to the material characteristics, the current passing through the shunt will cause it to heat up and then cause the resistance value to change. However, in the past, the effect of temperature change on resistance was often ignored, and the resistance value of the shunt was set to a fixed value by default, which resulted in a decrease in the measurement accuracy of the shunt during use.

[0003] The prior art discloses a flow divider 10 with a temperature detection function, the structure of which is as follows: Figure 1 As shown, it includes: electrodes 11, a resistor 12 and a PCB board 13 with an NTC temperature sensor, wherein the electrodes 11 are arranged on both sides of the resistor 12, and the PCB board 13 with the NTC temperature sensor is arranged above the resistor 12. In order to improve the measurement accuracy, the shunt 10 is pre-calibrated for the resistance values ​​at different temperatures, and the temperature of the shunt is collected in real time during use, so as to compensate for its resistance value in combination with stability.

[0004] The existing calibration method is as follows: by testing the resistance of the shunt at different temperatures and the resistance of the NTC on the shunt, based on these data, the corresponding relationship between the temperature and resistance of the product is inferred. Generally, this corresponding relationship is presented in the form of a parabola (temperature compensation curve). In the subsequent use process, this corresponding relationship can be used to obtain the resistance of the shunt at the temperature, thereby improving the accuracy of the shunt to a certain extent.

[0005] The variables of the existing calibration test method include ambient temperature and current intensity. During the test, the test can be divided into several test groups according to different ambient temperatures, and the data of the shunt 10 under different current intensities are measured in each test group. Finally, the obtained data is processed, calculated, and fitted to generate calibration parameters.

[0006] However, the existing calibration test does not have a suitable experimental device, and usually uses manual operation to test the shunts one by one. This one-by-one testing method is not only time-consuming and labor-intensive, but also easily causes changes in ambient temperature due to frequent manual operation, thereby affecting the data results; or human errors may cause inaccurate data statistics.

[0007] To this end, how to design an experimental device for shunt accuracy calibration testing so that it can conveniently and quickly calibrate and test multiple shunts, accurately collect test data under different ambient temperatures and different current intensities, reduce labor costs while reducing the probability of error, thereby improving work efficiency, is a technical problem that technicians in this field need to solve. Summary of the invention

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an experimental device for shunt accuracy calibration testing, so that it can conveniently and quickly calibrate and test multiple shunts, accurately collect test data under different ambient temperatures and different current intensities, reduce labor costs and reduce the probability of error, thereby improving work efficiency.

[0009] The objective of the present invention is achieved through the following technical solutions:

[0010] An experimental device for shunt accuracy calibration test, comprising: a device body, a driving component and an automatic detection component, wherein the device body is provided with a receiving chamber, and the automatic detection component is received in the receiving chamber;

[0011] The automated detection component comprises: a fixed pedestal, a support rotating frame, a fixture disk assembly, an intermittent connection test assembly and a shielding cover, wherein the fixed pedestal is mounted on the device housing, the support rotating frame is rotatably mounted on the fixed pedestal, the fixture disk assembly is mounted on the support rotating frame, the intermittent connection test assembly is mounted on the fixed pedestal, the shielding cover is liftably mounted above the fixture disk assembly, and the driving component is drivingly connected to the shielding cover;

[0012] The fixture plate assembly includes: an upper plate, a lower plate and a plurality of intermediate clamping seats, there is a gap between the upper plate and the lower plate, and the two cooperate to form a plurality of fixture slots, the plurality of fixture slots are distributed in a circular array with the rotating shaft of the supporting rotating frame as the center, and the plurality of intermediate clamping seats are respectively arranged in the plurality of fixture slots, and the intermediate clamping seats are used to clamp and electrically connect the shunt;

[0013] The intermittent connection test assembly is electrically connected to or separated from the intermediate card holder;

[0014] When the shielding cover is close to the fixture plate assembly, the shielding cover will cover the opening of the fixture slot, and the shielding cover is drivingly connected to the upper plate of the fixture plate assembly.

[0015] In one embodiment, the intermediate card seat is provided with: a sampling connector, a power transmission connector and a conductive end, the sampling connector is used to connect with the shunt, the power transmission connector faces the intermittent connection test assembly, and the conductive end is used to contact with the electrode of the shunt;

[0016] The intermittent connection test assembly includes: a pillar, a telescopic cylinder and a power transmission socket, the telescopic cylinder is installed on the pillar, the power transmission socket is arranged on the piston rod of the telescopic cylinder, and the telescopic cylinder drives the power transmission socket to plug in or out of the power transmission connector.

[0017] In one embodiment, the number of the telescopic cylinders and the power transmission sockets are three, the three telescopic cylinders are evenly distributed in a ring with the rotating shaft of the supporting rotating frame as the center, the three power transmission sockets correspond to the three telescopic cylinders respectively, and the three power transmission sockets provide currents of different sizes respectively.

[0018] In one of the embodiments, the device compartment body is provided with: a compartment door, a refrigeration pipeline and a heating tube, the compartment door covers the accommodating chamber, and the refrigeration pipeline and the heating tube are accommodated in the accommodating chamber.

[0019] In one of the embodiments, a temperature sensing probe is provided in the accommodating chamber.

[0020] In one embodiment, the driving component includes a motor and a lifting module, the motor is installed on the device housing through the lifting module, the motor is provided with an output shaft, and the output shaft is passed through the accommodating chamber; the shielding cover is installed on the output shaft, the motor drives the shielding cover to rotate through the output shaft, and the lifting module drives the motor and the shielding cover to perform lifting movements.

[0021] In one embodiment, a paddle is provided on the shielding cover, and when the shielding cover is close to the fixture plate assembly, the paddle will be inserted into the internal gap of the upper plate.

[0022] In one embodiment, the shielding cover is a hollow structure.

[0023] In one of the embodiments, at the opening of the fixture groove, the upper plate and the lower plate are both provided with a bell-mouth structure.

[0024] In summary, the experimental device for shunt accuracy calibration test of the present invention can conveniently and quickly perform calibration tests on multiple shunts, accurately collect test data under different ambient temperatures and different current intensities, reduce labor costs and reduce the probability of errors, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore 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.

[0026] Figure 1 It is a structural schematic diagram of the diverter involved in the present invention;

[0027] Figure 2 It is a structural schematic diagram of an experimental device for shunt accuracy calibration test of the present invention;

[0028] Figure 3 for Figure 2 An exploded schematic diagram of an experimental setup for shunt accuracy calibration testing is shown;

[0029] Figure 4 for Figure 2 A schematic diagram of the structural decomposition of the automated detection components shown;

[0030] Figure 5 for Figure 2 A top view of the automated inspection component shown;

[0031] Figure 6 It is a schematic diagram of the local structure of the fixture plate assembly;

[0032] Figure 7 It is a schematic diagram of the matching relationship between the diverter and the middle holder;

[0033] Figure 8 for Figure 2 A schematic diagram of the structure of the driving component shown;

[0034] Fig. 9 The present invention is an operational flow chart of the calibration test method. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] The present invention provides an experimental device 20 for shunt accuracy calibration test, aiming to realize convenient and quick calibration test of multiple shunts 10, reduce labor costs and reduce the probability of error, thereby improving work efficiency.

[0039] It should be noted in advance that the structure of the existing diverter 10 is as follows Figure 1 As shown, it includes: electrodes 11, resistor 12 and PCB board 13. The electrodes 11 are arranged on both sides of the resistor 12, the PCB board 13 is arranged above the resistor 12, and the PCB board 13 is provided with an NTC temperature sensor 14 and a sampling output terminal 15. During use, the current passes through the electrodes 11 and the resistor 12, the external test instrument is connected to the sampling output terminal 15, the NTC temperature sensor 14 monitors the surface temperature of the resistor 12 in real time, and feeds back the information to the external test instrument through the changing resistance value. In this way, the external instrument can compensate the voltage monitoring result of the shunt 10 according to the surface temperature information of the resistor 12, combined with the pre-calibrated temperature compensation curve, so as to obtain more accurate data.

[0040] The experimental device 20 for shunt accuracy calibration test of the present invention is as follows: Figure 2 and Figure 3 As shown, it includes: a device housing 100 , a driving component 200 and an automatic detection component 300 . The device housing 100 is provided with a receiving chamber 110 , and the automatic detection component 300 is received in the receiving chamber 110 .

[0041] like Figure 4 As shown, the automated testing component 300 includes: a fixed base 310, a support rotating frame 320, a fixture plate assembly 330, an intermittent connection test assembly 340 and a shielding cover 350 (such as Figure 3As shown in FIG. 1 , the fixed pedestal 310 is mounted on the device housing 100, and the support rotating frame 320 is rotatably mounted on the fixed pedestal 310. The fixture plate assembly 330 is mounted on the support rotating frame 320, the intermittent connection test assembly 340 is mounted on the fixed pedestal 310, the shielding cover 350 is liftably mounted above the fixture plate assembly 330, and the driving component 200 is drivingly connected to the shielding cover 350.

[0042] like Figure 4 As shown, the fixture plate assembly 330 includes: an upper plate 331, a lower plate 332 and a plurality of intermediate holders 333. There is a gap between the upper plate 331 and the lower plate 332, and the two cooperate to form a plurality of fixture slots 301 (such as Figure 5 and Figure 6 As shown, a plurality of fixture slots 301 are distributed in a circular array around the rotating shaft of the support rotating frame 320 (as shown in FIG. Figure 5 As shown in the figure), a plurality of intermediate clamping seats 333 are respectively arranged in a plurality of fixture slots 301, and the intermediate clamping seats 333 are used to clamp and electrically connect the diverter 10.

[0043] The intermittent connection test assembly 340 is electrically connected or disconnected from the intermediate card seat 333. When the shielding cover 350 is close to the fixture plate assembly 330, the shielding cover 350 will cover the opening of the fixture slot 301, and the shielding cover 350 is drivingly connected to the upper plate 331 of the fixture plate assembly 330.

[0044] In this embodiment, if Figure 7 As shown, the middle card holder 333 is provided with: a sampling connector 3331, a power transmission connector 3332 and a conductive end 3333, the sampling connector 3331 is used to connect to the sampling output end 15 of the shunt 10, the power transmission connector 3332 faces the intermittent connection test component 340, and the conductive end 3333 is used to contact the electrode 11 of the shunt 10.

[0045] like Figure 4 As shown, the intermittent connection test assembly 340 includes: a support 341, a telescopic cylinder 342 and a power transmission socket 343. The telescopic cylinder 342 is installed on the support 341, and the power transmission socket 343 is arranged on the piston rod of the telescopic cylinder 342. The telescopic cylinder 342 drives the power transmission socket 343 to plug in or disconnect from the power transmission connector 3332.

[0046] Preferably, Figure 4 As shown, the number of telescopic cylinders 342 and power transmission sockets 343 are three. The three telescopic cylinders 342 are evenly distributed in a ring with the rotating shaft supporting the rotating frame 320 as the center. The three power transmission sockets 343 correspond to the three telescopic cylinders 342 respectively, and the three power transmission sockets 343 provide currents of different sizes respectively.

[0047] In this embodiment, if Figure 3 As shown, the device chamber body 100 is provided with: a chamber door (not shown), a refrigeration pipeline 120 and a heating tube 130. The chamber door covers the accommodating chamber 110, and the refrigeration pipeline 120 and the heating tube 130 are both accommodated in the accommodating chamber 110. During operation, the refrigeration pipeline 120 is connected to an external refrigeration device, and the heating tube 130 is connected to an external power supply. Both work selectively as needed, so as to maintain the ambient temperature in the accommodating chamber 110 within the range required by the experiment. Preferably, a temperature sensing probe (not shown) is provided in the accommodating chamber 110. The temperature sensing probe is used to feedback the ambient temperature in the accommodating chamber 110, and then decide whether to enable the external refrigeration device and the heating tube 130.

[0048] In this embodiment, if Figure 8 As shown, the driving component 200 includes a motor 210 and a lifting module 220. The motor 210 is installed on the device chamber 100 through the lifting module 220. The motor 210 is provided with an output shaft 230, and the output shaft 230 is passed through the accommodating chamber 110. The shielding cover 350 is installed on the output shaft 230. The motor 210 drives the shielding cover 350 to rotate through the output shaft 230, and the lifting module 220 drives the motor and the shielding cover 350 to perform lifting motion.

[0049] Preferably, the shielding cover 350 is provided with a paddle (not shown), and when the shielding cover 350 is close to the fixture plate assembly 330, the paddle will be inserted into the internal gap of the upper plate 331. In this way, the rotating shielding cover 350 can drive the fixture plate assembly 330 and the supporting rotating frame 320 to rotate together through the paddle.

[0050] Preferably, the shielding cover 350 is a hollow structure (such as Figure 8 ). The shielding cover 350 of this structure can promote the flow of surrounding air during the rotation process, so that the ambient temperature around the fixture plate assembly 330 is evenly distributed.

[0051] The following is an explanation of the calibration method involved in the present invention:

[0052] The operation process of the calibration test is as follows: Fig. 9As shown. First, connect the shunt 10, including connecting the electrode 11 to the DC power supply and the sampling output terminal 15 to the external test instrument; after the connection is completed, set the ambient temperature. This test method requires a total of 5 different ambient temperatures, namely -40°C, -25°C, 0°C, 80°C, and 125°C. An ambient temperature needs to be set for each calibration test. After the ambient temperature reaches the specified value, the shunt 10 can be calibrated and tested in turn. During the calibration test, the current uses three different sets of values, namely 10A current, 100A current, and rated current (the rated current value of the shunt 10 when it is officially used after leaving the factory). After completing the current test, set the next temperature to be tested until the shunt is tested under all temperature conditions (that is, the same shunt 10 needs to be tested under each ambient temperature and connected to 3 currents). Finally, the obtained data is processed, calculated, and fitted to generate calibration parameters. The calibration test can obtain the corresponding relationship between the resistance value of the shunt 10 and its surface temperature. Generally speaking, this corresponding relationship is presented in the form of a parabola, and the expression is as follows:

[0053] R=A×T 2 +B×T+C,

[0054] R—resistance of shunt 10;

[0055] T—Surface temperature of the shunt 10 (can be obtained by converting the resistance value of the NTC temperature sensor 14)

[0056] A, B, and C are calibration parameters.

[0057] Next, in combination with the above structure and calibration test method, the working principle of the experimental device 20 for shunt accuracy calibration test of the present invention is explained. Figure 3 , Figure 4 and Figure 7 :

[0058] Before the test, the shielding cover 350 is away from the fixture tray assembly 330, and the fixture slot 301 is in an exposed state. The staff puts multiple diverters 10 into multiple fixture slots 301 respectively, and connects the diverters 10 to the middle card seat 333 (the sampling output end 15 of the diverter 10 is plugged into the sampling connector 3331). The power transmission socket 343 is electrically connected to the external test instrument. It is worth noting that the power transmission connector 3332 and the power transmission socket 343 are not only used to transmit sampling information, but also play a power supply role. Specifically, the power transmission connector 3332 and the power transmission socket 343 are both built-in with positive and negative power supply lines (not shown in the figure), and the positive and negative power supply lines of the power transmission connector 3332 are respectively connected to the conductive ends 3333 on both sides; after power is turned on, the two electrodes 11 of the diverter 10 will contact the conductive ends 3333 on both sides, so that conduction can be achieved;

[0059] At the beginning of the test, the staff needs to set the ambient temperature in the receiving chamber 110, and then the refrigeration pipe 120 or the heating pipe 130 changes the ambient temperature to the set value. For example, if it is set to 0°C, the external refrigeration equipment and the refrigeration pipe 120 will start working to maintain the ambient temperature in the receiving chamber 110 at about 0°C;

[0060] Then the test officially starts, and the driving component 200 prompts the shielding cover 350 to approach the fixture disk assembly 330. The shielding cover 350 will block the opening of the fixture slot 301, so that the diverter 10 in the fixture slot 301 cannot be separated. Next, the automated detection component 300 starts to be used. Taking one of the automated detection components 300 as an example, the piston rod of its telescopic cylinder 342 is extended, so that the power transmission socket 343 is plugged into the power transmission connector 3332 of the corresponding intermediate card seat 333. At this time, the intermediate card seat 333 provides current to the diverter 10 and collects data. After the data collection is completed, the piston rod of the telescopic cylinder 342 retracts, and the power transmission socket 343 is separated from the power transmission connector 3332. Then, the shielding cover 350 rotates an angle with the fixture disk assembly 330, so that the next intermediate card seat 333 is aligned with the automated detection component 300. The telescopic cylinder 342 is extended again to repeat the above process, and data can be collected for the next diverter 10.

[0061] It is worth noting that during the test, multiple automated detection components 300 can be carried out synchronously without interfering with each other. Moreover, the three automated detection components 300 of this embodiment correspond to different test currents, for example: the first power transmission socket 343 provides 10A current, the second power transmission socket 343 provides 100A current, and the third power transmission socket 343 provides rated current. In this way, under the same ambient temperature, the three automated detection components 300 simultaneously collect data on the three shunts 10, and the supplied currents are not the same. As the fixture disk assembly 330 rotates, the multiple shunts 10 thereon will pass through the three automated detection components 300 in turn, thereby completing the test of the three currents. After the fixture disk assembly 330 rotates one circle, the staff will reset the ambient temperature and then repeat the above test process until the tests of 5 ambient temperatures are completed. Only then is the calibration test completed;

[0062] After the calibration test is completed, the driving component 200 forces the shielding cover 350 to move away from the fixture tray assembly 330 , and the staff can then take out the multiple diverters 10 that have completed the test from the fixture tray assembly 330 .

[0063] It should be emphasized that compared with the traditional manual test operation method, the experimental device 20 of the present invention has the following advantages:

[0064] First, multiple diverters 10 can be accommodated at one time, and the same ambient temperature can be provided for these diverters 10. As the fixture plate assembly 330 rotates, these diverters 10 will cooperate with the same automatic detection component 300 in turn, thereby completing the data collection of all diverters 10, so that there is no need for personnel to operate one by one, reducing labor costs and the probability of errors;

[0065] Secondly, multiple automated detection components 300 can be operated synchronously and provide different currents to each other. In this way, under the same ambient temperature, the fixture plate assembly 330 only needs to rotate once to make all the shunts 10 pass through multiple automated detection components 300, thereby greatly improving the test efficiency and shortening the test time; this also reduces the time the device maintains the ambient temperature and achieves energy saving.

[0066] In other embodiments, at the opening of the fixture slot 301, the upper plate 331 and the lower plate 332 are both provided with a bell-mouth structure 302 (such as Figure 6 The bell mouth structure 302 can provide guidance when plugging the diverter 10, so that the diverter 10 is easier to be connected with the middle card seat 333.

[0067] In summary, the experimental device 20 for shunt accuracy calibration test of the present invention can conveniently and quickly perform calibration tests on multiple shunts 10, thereby reducing labor costs and the probability of errors, thereby improving work efficiency.

[0068] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An experimental device for shunt accuracy calibration test, characterized in that: include: A device housing, a driving component and an automated detection component, wherein the device housing is provided with a receiving chamber, and the automated detection component is received in the receiving chamber; The automated detection component comprises: a fixed pedestal, a support rotating frame, a fixture disk assembly, an intermittent connection test assembly and a shielding cover, wherein the fixed pedestal is mounted on the device housing, the support rotating frame is rotatably mounted on the fixed pedestal, the fixture disk assembly is mounted on the support rotating frame, the intermittent connection test assembly is mounted on the fixed pedestal, the shielding cover is liftably mounted above the fixture disk assembly, and the driving component is drivingly connected to the shielding cover; The fixture plate assembly includes: an upper plate, a lower plate and a plurality of intermediate clamping seats, there is a gap between the upper plate and the lower plate, and the two cooperate to form a plurality of fixture slots, the plurality of fixture slots are distributed in a circular array with the rotating shaft of the supporting rotating frame as the center, and the plurality of intermediate clamping seats are respectively arranged in the plurality of fixture slots, and the intermediate clamping seats are used to clamp and electrically connect the shunt; The intermittent connection test assembly is electrically connected to or separated from the intermediate card holder; When the shielding cover is close to the fixture plate assembly, the shielding cover will cover the opening of the fixture slot, and the shielding cover is drivingly connected to the upper plate of the fixture plate assembly.

2. The experimental device for shunt accuracy calibration test according to claim 1, characterized in that: The intermediate card holder is provided with: a sampling joint, a power transmission joint and a conductive end, the sampling joint is used to connect with the shunt, the power transmission joint faces the intermittent connection test assembly, and the conductive end is used to contact with the electrode of the shunt; The intermittent connection test assembly includes: a pillar, a telescopic cylinder and a power transmission socket, the telescopic cylinder is installed on the pillar, the power transmission socket is arranged on the piston rod of the telescopic cylinder, and the telescopic cylinder drives the power transmission socket to plug in or out of the power transmission connector.

3. The experimental device for shunt accuracy calibration test according to claim 2, characterized in that: The number of the telescopic cylinders and the power transmission sockets are both three. The three telescopic cylinders are evenly distributed in a ring with the rotating shaft of the supporting rotating frame as the center. The three power transmission sockets correspond to the three telescopic cylinders respectively, and the three power transmission sockets provide currents of different sizes respectively.

4. The experimental device for shunt accuracy calibration test according to claim 1, characterized in that: The device warehouse body is provided with a warehouse door, a refrigeration pipeline and a heating pipe. The warehouse door covers the accommodating chamber, and the refrigeration pipeline and the heating pipe are accommodated in the accommodating chamber.

5. The experimental device for shunt accuracy calibration test according to claim 4, characterized in that: A temperature sensing probe is arranged in the accommodating chamber.

6. The experimental device for shunt accuracy calibration test according to claim 1, characterized in that: The driving component includes a motor and a lifting module. The motor is installed on the device housing through the lifting module. The motor is provided with an output shaft, and the output shaft is passed through the accommodating chamber. The shielding cover is installed on the output shaft. The motor drives the shielding cover to rotate through the output shaft, and the lifting module drives the motor and the shielding cover to perform lifting movements.

7. The experimental device for shunt accuracy calibration test according to claim 6, characterized in that: The shielding cover is provided with a paddle, and when the shielding cover is close to the fixture plate assembly, the paddle will be inserted into the internal gap of the upper plate.

8. The experimental device for shunt accuracy calibration test according to claim 1, characterized in that: The shielding cover is a hollow structure.

9. The experimental device for shunt accuracy calibration test according to claim 1, characterized in that: At the opening of the fixture groove, the upper plate and the lower plate are both provided with a bell-mouth structure.

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