Shunt test equipment

Abstract

The utility model relates to the technical field of detection, and particularly discloses shunt test equipment, which comprises a current source, a voltage acquisition device, a detection device and an upper computer, the detection device has an open state and a closed state, an installation position and two connection parts are arranged in the detection device, and the two connection parts are connected with the current source in series; when the detection device is in a closed state, the two connecting parts respectively abut against the two detection ends of the shunt to be detected; the voltage acquisition device is used for being electrically connected to two ends of the shunt to be tested so as to acquire a real-time calibration voltage value of the shunt to be tested; the upper computer is in communication connection with the current source and the voltage acquisition device so as to acquire the calibration current of the current source and the real-time calibration voltage value of the voltage acquisition device and calibrate the resistance value of the shunt to be tested. The shunt test equipment provided by the technical scheme of the utility model is good in protection performance and high in detection precision.

Description

TECHNICAL FIELD

[0001] The utility model relates to test device technical field, especially relates to a shunt testing equipment. BACKGROUND

[0002] The shunt is a kind of current sensor, its structure is simple, does not have any magnetic component, is not susceptible to interference, can realize higher precision, is widely used therefore.The resistance of shunt directly influences the voltage of output terminal, to realize the accurate measurement of current, the resistance of shunt is required accurately.

[0003] In the related art, the resistance of shunt is calibrated after being made to ensure product quality, but the existing detection equipment is generally provided with opening, and the protection is not enough, which affects detection accuracy. UTILITY MODEL CONTENT

[0004] The utility model discloses a shunt testing equipment, to solve the problem that shunt testing equipment is not enough protection.

[0005] To achieve the above-mentioned purpose, the shunt testing equipment provided by the utility model comprises:

[0006] Current source, for being connected in series with the shunt to be measured;

[0007] Detection device, the detection device has opening state and closed state, the detection device is equipped with installation site and two connecting parts in the inside, the installation site is used to install the shunt to be measured, two the connecting parts are connected in series with the current source;The detection device is in closed state, and two The connecting parts abut two detection ends of the shunt to be measured respectively;In the opening state, two The connecting parts are disconnected with two detection ends of the shunt to be measured;And

[0008] Voltage acquisition device, the voltage acquisition device is used to be electrically connected to two ends of the shunt to be measured, to collect the real-time calibration voltage value of the shunt to be measured;And

[0009] Host computer, the host computer is connected with current source and voltage acquisition device communication, to obtain the calibration current of current source and the real-time calibration voltage value of voltage acquisition device, and the resistance of the shunt to be measured is calibrated.

[0010] In the scheme, the current source inputs calibration current to the shunt to be measured through connecting part, and the voltage acquisition device can collect the real-time calibration voltage value of the shunt to be measured under the calibration current, and the host computer processes the above-mentioned data, and the calibration resistance of the shunt to be measured can be calculated according to Ohm's law.And when the detection device is set to closed state, only then connecting part and the shunt to be measured are communicated to detect, so, can reduce the probability of being interfered by outside, thereby improving protection, and improving detection accuracy.

[0011] In an embodiment of the utility model, the detection device includes base and the cover body of rotation connection in base, the cover body relative base rotation to have the open state and the closed state, the closed state the cover body with base enclose and form the detection cavity, the installation site is located in base, two the connecting part interval is located in the cover body.

[0012] The connecting part and the to-be-measured shunt can be connected and disconnected conveniently through the rotation opening mode.

[0013] In an embodiment of the utility model, the surface of the cover body facing the base is provided with a mounting bracket, and the two connecting parts are spaced apart from the surface of the mounting bracket facing the base.

[0014] The detection device further includes two cables, one end of each cable penetrates into the base and is electrically connected with the current source, and the other end is located on the side of the mounting bracket away from the base and is electrically connected with each connecting part through the mounting bracket.

[0015] Here, the mounting bracket can hide the cables on the side of the connecting part away from the base, reducing the influence on the connection of the connecting part and the to-be-measured shunt.

[0016] In an embodiment of the utility model, the detection device further includes a driving member, the fixed end of the driving member is connected to one of the base and the cover body, and the driving end is connected to the other one of the base and the cover body, and the driving member drives the cover body and the base to be in the open state or the closed state.

[0017] The controller and the driving member realize the automatic opening and closing of the cover body, which can improve the detection efficiency and accuracy.

[0018] In an embodiment of the utility model, the driving member is provided with two, the fixed ends of the two driving members are respectively connected to the opposite sides of the base, and the driving ends of the two driving members are respectively connected to the two sides of the cover body.

[0019] And / or, the driving member is a pneumatic cylinder or an electric cylinder.

[0020] The provision of two driving members can improve the stability of the opening or closing process of the cover body.

[0021] The pneumatic cylinder or the electric cylinder has simple structure and good driving stability.

[0022] In an embodiment of the utility model, the detection device further includes a controller, the controller is located in the base and is electrically connected with the driving member, and the controller controls the driving member to drive the cover body and the base to be in the open state or the closed state.

[0023] The controller is in communication connection with the host computer, and the controller is used for sending a starting detection signal to the host computer, and the host computer controls the current source to input a calibration current to the to-be-tested shunt.

[0024] Through the communication connection of the controller and the host computer, the personnel operation can be further reduced, and full automation from the cover closing to the detection completion is realized.

[0025] In an embodiment of the utility model, the outer circumferential surface of base is equipped with two interval arrangement control keys, two control keys with controller electric connection for triggering drive piece.

[0026] The setting of two control keys can prevent accidental touch.

[0027] In an embodiment of the utility model, the mounting position is a mounting groove, the base is provided with an avoiding groove on one side wall of the mounting groove, and a connector is arranged in the avoiding groove.

[0028] The connector is electrically connected with the voltage acquisition device, and the plug of the connector is arranged towards the mounting groove and is used for being inserted into the interface of the to-be-tested shunt.

[0029] The connector not only plays an electrical connection role but also can position the to-be-tested shunt in the direction perpendicular to the base, and the groove wall of the mounting groove can position the to-be-tested shunt in the circumferential direction, so that the to-be-tested shunt has good installation stability.

[0030] In an embodiment of the utility model, the surface of the cover towards the mounting position is at least partially transparent.

[0031] The transparent structure facilitates monitoring the detection condition in the detection device and facilitates timely adjustment.

[0032] In an embodiment of the utility model, both the connecting parts are copper blocks.

[0033] The cross section of the copper block is larger relative to the needle structure, so that the contact area with the to-be-tested shunt is increased, the impedance is reduced, and the detection precision is improved.

[0034] In an embodiment of the utility model, the host computer is further used for controlling the current source to input calibration currents with at least two different values to the to-be-tested shunt, the calibration current is greater than the calibration current, and the host computer acquires and processes the calibration current of the current source and the real-time calibration voltage value of the voltage acquisition device to calibrate the resistance precision of the to-be-tested shunt.

[0035] After the shunt testing equipment calibrates the resistance value of the to-be-tested shunt, the current detection precision of the to-be-tested shunt under a larger current value can be detected, and the quality of the to-be-tested shunt is further improved. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of an embodiment of the shunt test equipment of this utility model;

[0038] Figure 2 for Figure 1 The exploded view of the testing device in the shunt test equipment shown.

[0039] Explanation of icon numbers:

[0040] 100. Shunt test equipment; 10. Current source; 20. Detection device; 21. Base; 211. Mounting position; 212. Clearance groove; 22. Cover; 23. Connecting part; 24. Mounting bracket; 25. Cable; 26. Drive component; 27. Connector; 271. Plug; 28. Cooling fan; 30. Voltage acquisition device.

[0041] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0044] In the utility model, unless another definite provision and limitation, the terms "connect", "fix" and the like should be understood broadly, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through intermediate medium, can be the communication inside two elements or the interaction of two elements, unless another definite limitation. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0045] In addition, the description of "first", "second" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel schemes, for example, "A and / or B", which includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0046] The current sensor is a detection device that can sense the information of the measured current and convert the sensed information into an electrical signal or other required form of information output according to certain rules to meet the requirements of information transmission, processing, storage, display, recording and control.

[0047] One kind of current sensor is shunt type, which is simple in structure, does not have any magnetic component, is not easy to be disturbed, and can realize higher precision, so it is widely used. In the shunt type current sensor, the shunt is a key component, and the essence of the shunt is a first high-precision resistor. The current flows from the input end of the shunt, and when it passes through the shunt, the voltage between the input and output terminals is measured, and the detected voltage can be converted back to represent the current according to Ohm's law. The resistance of the shunt directly affects the voltage of the output terminal, in order to realize accurate measurement of current, the resistance of the shunt is required to be accurate.

[0048] In the related art, the resistance of the shunt is generally calibrated manually using a test pen, which is low in efficiency and inaccurate in detection accuracy. Some also set up a special detection table for automatic connection detection through a probe, but most detection equipment is open, which is not good for protection, affecting the detection accuracy.

[0049] Based on the above background, the utility model provides a shunt testing equipment, through setting detection device as having open state and closed state, open state, connecting portion and the shunt under test are disconnected, can place and replace the shunt under test, in closed state again intercommunication connecting portion and the shunt under test, thereby realizing the resistance calibration of the shunt under test through current source, voltage acquisition device and host computer, effectively improve the protection in detection process, avoid interference, improve detection precision.

[0050] The shunt testing equipment described in the utility model embodiment can be used for detecting newly made shunts, and can also be used for detecting shunts used for a period of time. Of course, the shunt testing equipment of the utility model embodiment can also be applied to the detection of other current sensors.

[0051] Please refer to Figure 1 And Figure 2 In an embodiment of the utility model, the shunt testing equipment 100 includes a current source 10, a detection device 20, a voltage acquisition device 30 and a host computer, and the current source 10 is used to be connected in series with a shunt under test;

[0052] The detection device 20 has an open state and a closed state, and is internally provided with a mounting position 211 and two connecting portions 23; the mounting position 211 is used to mount the shunt under test, and the two connecting portions 23 are connected in series with the current source 10; when the detection device 20 is in the closed state, the two connecting portions 23 abut against two detection ends of the shunt under test respectively; when the detection device 20 is in the open state, the two connecting portions 23 are disconnected from the two detection ends of the shunt under test.

[0053] The voltage acquisition device 30 is used to be electrically connected to two ends of the shunt under test to acquire real-time calibration voltage values of the shunt under test; the host computer is in communication connection with the current source 10 and the voltage acquisition device 30 to acquire calibration current of the current source 10 and real-time calibration voltage values of the voltage acquisition device 30, and calibrate resistance values of the shunt under test.

[0054] In this embodiment, the shunt testing device 100 refers to a device that can at least calibrate the resistance value of the shunt. Other performance tests of the shunt can also be performed as needed, such as current accuracy testing. The current source 10 is a circuit element or device that can provide a constant output current. It is commonly used as a current signal source in measurements, instruments, electronic devices, or other applications. Here, the current source 10 can be an adjustable current source 10, a high-precision current source 10, or a standard current source 10, etc. without limitation, and can be set as needed. The range can also be selected as needed to test multiple models of current sensors with different ranges. The current source 10 is used in series with the shunt to be tested, and at least a calibration current can be input to the shunt to be tested.

[0055] The detection device 20 is a device for providing a fixed position for the detection of the shunt to be tested. It has an open state and a closed state, which means that the detection device 20 has a cavity formed inside, and the cavity can be opened to have an opening in the open state by moving part of the structure, and the opening can be closed by moving part of the structure. Here, the opening of the cavity is the only opening for placing the product to be tested or replacing the product to be tested, or the only opening for any operation in the detection process. Of course, when the detection device 20 is in the closed state, the cavity formed by the detection device 20 can not be completely sealed and can have a hole communicating with the outside, for example, the detection device 20 has a heat dissipation hole, etc., but the hole cannot realize any operation action. An example is that the detection device 20 is a box structure, another example is that the detection device 20 is a frame structure, or any other device that has an internal space and can open and close the internal space. The movable part and the fixed part of the detection device 20 can be a rotating fit, or a translational fit, including horizontal translation or vertical translation, without limitation.

[0056] The detection device 20 is provided with two connecting portions 23, which are respectively connected in series with the current source 10, that is, one connecting portion 23 is connected to the positive electrode of the current source 10, and the other connecting portion 23 is connected to the negative electrode of the current source 10, so that when the two connecting portions 23 are in contact with the two detection ends of the shunt to be detected, the electrical conduction can be realized, so that the current source 10, the connecting portion 23, the shunt to be detected, the other connecting portion 23, and the current source 10 form a complete series circuit. The connecting portion 23 is an end conductive structure connected by a cable 25, and the material thereof can be a conductive metal, such as copper, silver, etc. The connecting portion 23 can be in abutting relationship with the shunt to be detected, so as to realize electrical conduction. For example, the connecting portion 23 can be needle-shaped, plate-shaped, block-shaped, etc. The connecting portion 23 can also be in plug-in relationship with the shunt to be detected, so as to realize electrical conduction. For example, the connecting portion 23 can be a socket, a plug, etc., which can be inserted into the jack of the shunt to be detected. The mounting position 211 can be a groove structure, a clamp structure, or a mechanical hand, etc., which is not limited here.

[0057] When the detection device 20 is in the closed state, the two connecting portions 23 are in contact with the shunt to be detected to realize electrical conduction. When the detection device 20 is in the open state, the two connecting portions 23 are separated from the shunt to be detected, so as to break the circuit. The open state here can not be limited by the opening angle or the opening distance, that is, it can have multiple open states, as long as the separation of the connecting portion 23 and the shunt to be detected can be realized.

[0058] In this example, the voltage acquisition device 30 is a digital multimeter, which is a multi-purpose electronic measuring instrument for measuring voltage, current and resistance, and also has other functions. Optionally, the digital multimeter is a seven-and-a-half digit digital multimeter, which has high resolution and high detection accuracy. The structure of the digital multimeter is a standard structure, which is not described here. The specific range can be selected according to the detection needs. In other examples, the voltage acquisition device 30 can also be a voltmeter. The voltage acquisition device 30 is used to be electrically connected to the two ends of the shunt to be detected, that is, the current input end and the current output end of the shunt to be detected in the series circuit, so as to acquire the real-time calibration voltage value of the shunt to be detected.

[0059] The to-be-tested shunt is installed on the detection device 20, and is electrically connected with the current source 10 and the voltage acquisition device 30 through the detection device 20. Therefore, in an example, the current source 10 and the voltage acquisition device 30 are independently arranged, the detection device 20 is provided with a structure (not shown in the figure) electrically connected with the connecting portion 23 on the periphery thereof, and is provided with a structure (not shown in the figure) electrically connected with the voltage acquisition device 30, and is electrically connected with the independent current source 10 and / or voltage acquisition device 30 through a cable 25, a flat cable or a plug 271 socket and the like. In this way, the current source 10 and the voltage acquisition device 30 can be more flexible and cost-saving. Alternatively, in another example, the current source 10 and the voltage acquisition device 30 can also be integrated in the detection device 20, and are electrically connected through an integrated circuit board. This arrangement can make the overall device more compact, and does not need to be assembled and connected, thereby further improving the detection efficiency.

[0060] The host computer is a computer that can directly issue control commands, and is usually used for monitoring and controlling the slave computer. Here, the host computer can send a signal for acquiring data to the current source 10 and the voltage acquisition device 30, and obtain the calibration current value and the real-time calibration voltage value, so as to process the data and calculate the calibration resistance value of the to-be-tested shunt. The host computer can be more intuitive in observing data and automatically processing detection results, thereby improving the calibration efficiency.

[0061] In this scheme, the current source 10 inputs the calibration current to the to-be-tested shunt through the connecting portion 23, the voltage acquisition device 30 can acquire the real-time calibration voltage value of the to-be-tested shunt under the calibration current in real time, and the host computer processes the above data and calculates the calibration resistance value of the to-be-tested shunt according to Ohm's law. The detection device 20 is set to the closed state before the connecting portion 23 and the to-be-tested shunt are turned on for detection. In this way, the probability of being disturbed by the outside world can be reduced, thereby improving the protection and the detection precision.

[0062] Please continue to refer to Figure 1 In an embodiment of the utility model, the detection device 20 includes base 21 and the cover 22 of rotation connection in base 21, the cover 22 relative to base 21 rotation to have the opening state and the closed state, and the cover 22 and base 21 are enclosed to form detection cavity when the closed state, the installation site 211 is arranged in base 21, and the connecting portion 23 is spaced apart and arranged in the cover 22.

[0063] In the embodiment, the detection device 20 comprises a base 21 and a cover 22, which are rotationally connected on the same side, so as to be in a closed state when the other opposite sides abut, and a detection cavity is enclosed, in which the connecting part 23 is in contact with the shunt to be detected arranged on the base 21. One of the base 21 and the cover 22 can be a plate body, and the other is a cavity structure with an opening, and the detection cavity is enclosed by covering the cavity structure with the opening by the plate body. Alternatively, both the base 21 and the cover 22 are cavity structures with openings, and the opening edges of the two cavity structures are abutted to enclose the detection cavity, which is not limited here. The materials of the cover 22 and the base 21 are not limited, and both can be metal, plastic or other materials.

[0064] For example, both the base 21 and the cover 22 are cavity structures with openings, and the rotational connection can be a shaft hole cooperation or a hinge connection, which is not limited here. The other two opposite sides of the base 21 and the cover 22 can have detachable connection structures, so that the abutment of the connecting part 23 and the shunt to be detected is more stable; or it can be only an abutment relationship, and only the gravity of the cover 22 and the connecting part 23 realizes the pressing of the shunt to be detected, which is not limited here.

[0065] For example, the base 21 is a hollow structure, and part of the components can be placed inside, such as various lines and connectors 27, so as to ensure that the surface of the base 21 is not interfered, and the overall structure is more stable. In other examples, the base 21 can also be provided as a solid structure. The rotation of the cover 22 and the base 21 to open and close can be manually operated or automatically controlled, which is not limited here.

[0066] In this scheme, the abutment and disconnection of the connecting part 23 and the shunt to be detected can be conveniently realized by the rotation opening mode, without damaging the shunt to be detected due to friction, and space can also be saved. The mounting position 211 is arranged on the surface of the base 21 facing the cover 22, so as to be beneficial to the installation stability of the shunt to be detected and improve the detection accuracy.

[0067] Please refer to Figure 2 In an embodiment of the utility model, the surface of the cover 22 facing the base 21 is provided with a mounting rack 24, and the two connecting parts 23 are arranged on the surface of the mounting rack 24 facing the base 21.

[0068] The detection device 20 further comprises two cables 25, one end of each cable 25 penetrates into the base 21 and is electrically connected with the current source 10, and the other end is arranged on the side of the mounting rack 24 away from the base 21 and is electrically connected with each connecting part 23 through the mounting rack 24.

[0069] In the technical solution, the mounting rack 24 is connected to the inner side of the cover 22, i.e. the surface facing the base 21. The connection mode can be fixed connection, such as adhesion, or detachable connection, such as threaded connection or clamping, which is not limited herein. The material of the mounting rack 24 can be selected from non-conductive plastic or glass, so as to reduce the electric conduction effect on the cable 25 and the connecting part 23. The mounting rack 24 includes two support plates and a mounting plate connecting the two support plates. The support plates are connected to the cover 22, so that the mounting plate and the cover 22 form a mounting space therebetween. The two connecting parts 23 are arranged at the surface of the mounting rack 24 facing the base 21, i.e. on the mounting plate. One end of each cable 25 penetrates into the base 21 and is electrically connected to the current source 10 through the connector 27 or the circuit board inside the base 21. The other end of each cable 25 is located in the mounting space and is electrically connected to the connecting part 23, such as welding, terminal insertion or threaded compression, which is not limited herein. Optionally, the position where the cable 25 penetrates into the base 21 is close to the side where the cover 22 and the base 21 are rotatably connected, so that during the rotation of the cover 22, the cable 25 will not be pressed between the connecting part 23 and the to-be-tested shunt, further reducing the interference effect.

[0070] Here, the mounting rack 24 can hide the cable 25 on the side away from the base 21, reducing the influence on the connection between the connecting part 23 and the to-be-tested shunt.

[0071] Please refer to Figure 1 In an embodiment of the utility model, the detection device 20 further includes a driving member 26. The fixed end of the driving member 26 is connected to one of the base 21 and the cover 22, and the driving end is connected to the other one of the base 21 and the cover 22. The driving member 26 drives the cover 22 and the base 21 to be in the open state or the closed state.

[0072] In the technical solution, the driving member 26 is a device capable of providing driving force for relative rotation of the cover 22 and the base 21, for example, the driving member 26 can be a motor, a pneumatic cylinder or other devices. The fixed end of the driving member 26 refers to the housing of the driving member 26 and the components arranged therein for generating driving force, and the driving end refers to the driving shaft movable relative to the fixed end, for example, a motor shaft or a piston push rod. The fixed end of the driving member 26 is connected to one of the base 21 and the cover 22, and the driving end is connected to the other one of the base 21 and the cover 22, that is, the fixed end of the driving member 26 is connected to the base 21, and the driving end is connected to the cover 22; or the driving end of the driving member 26 is connected to the base 21, and the fixed end is connected to the cover 22, so that one of the base 21 and the cover 22 can be rotated to achieve the open state or the closed state. In other examples, when the driving member 26 is a motor, the cover 22 can also be connected to the motor shaft from the direction of the rotation axis to drive the cover 22 to rotate and open. The driving member 26 can be directly controlled by the upper computer to realize the operation of the driving member 26, or a separate control structure can be provided to control it, which is not limited here.

[0073] The scheme realizes automatic opening and closing of the cover 22 by the driving member 26, reduces manual operation, and improves detection efficiency and accuracy.

[0074] Please continue to refer to Figure 1 In an embodiment of the utility model, the driving member 26 is provided with two, and the fixed ends of the two driving members 26 are respectively connected to the opposite sides of the base 21, and the driving ends of the two driving members 26 are respectively connected to the two sides of the cover 22.

[0075] And / or, the driving member 26 is a pneumatic cylinder or an electric cylinder.

[0076] In the technical solution, the driving member 26 is provided with two, and the fixed ends of the two driving members 26 are respectively connected to the opposite sides of the base 21, that is, the mounting position 211 is arranged at the middle part of the base 21, and the two driving members 26 are respectively arranged at the two ends of the base 21 along the rotation axis of the cover 22 and close to the side of the cover 22 connected in rotation. The driving ends are connected to the two sides of the cover 22, that is, the two sides opposite to the connection positions of the fixed ends, that is, the two ends along the rotation axis of the cover 22 and away from the side of the cover 22 connected in rotation.

[0077] In the scheme, the arrangement of the two driving members 26 can provide more stable driving force and improve the stability and smoothness of the opening or closing process of the cover 22. At the same time, the position arrangement of the driving member 26 can make it more convenient to replace the shunt to be tested in the open state.

[0078] The driving member 26 is a cylinder, which is a device for converting gas pressure energy into linear motion, mainly composed of a cylinder body, a piston, a piston rod and a sealing element, etc.

[0079] In another example, the driving member 26 is an electric cylinder, which is a modular product integrating a servo motor and a lead screw, and realizes linear motion by rotating the lead screw driven by the motor. The electric cylinder has the characteristics of high precision and high efficiency, and can realize accurate speed, position and torque control.

[0080] In an embodiment of the utility model, the detection device 20 further includes a controller, which is arranged in the base 21 and electrically connected with the driving member 26, and the controller controls the driving member 26 to drive the cover body 22 and the base 21 to be in an open state or a closed state.

[0081] The controller is in communication connection with the upper computer, and the controller is used to send a starting detection signal to the upper computer, and the upper computer controls the current source 10 to input a calibration current to the shunt to be detected.

[0082] In the embodiment, the controller is a master device for controlling the starting, speed regulation, braking and reversing of the driving structure by changing the wiring of the main circuit or control circuit and changing the resistance value in the circuit according to a predetermined sequence. The controller can be a central processing unit (CPU), a microcontroller (MPU) or a combination logic controller, and the specific presentation form can be a circuit board or an electric control box, etc. Since the structure of the control member is a component capable of realizing electric control known to those skilled in the art, it will not be described in detail.

[0083] The controller is arranged in the base 21, that is, the base 21 has an accommodating space inside, and the controller can be installed in the accommodating space. Of course, a control switch is arranged at the detection device 20 and can be linked with the controller to start the driving member 26. The control switch can be a button, a knob or a touch control, etc. without limitation. The controller is in communication connection with the upper computer, and after the controller controls the driving member 26 to close the cover body 22, realizes the electrical conduction between the connecting part 23 and the shunt to be detected, the controller can send a starting detection signal to the upper computer, and the upper computer can control the current source 10 to input a calibration current to the shunt to be detected, so as to calibrate the resistance value of the shunt to be detected.

[0084] The control of the driving member 26 is arranged at the detection device 20 in the scheme, which can more intuitively detect whether to start or not, and is convenient for control. And through the communication connection between the controller and the upper computer, the personnel operation can be further reduced to realize the full automation from the cover body 22 covering to the completion of detection.

[0085] In an embodiment of the utility model, the outer circumferential surface of base 21 is equipped with two interval arrangement control keys (not shown in drawing), two control keys are electrically connected with controller, be used for triggering drive piece 26.

[0086] In the embodiment, the control keys are buttons, and the control member is provided with two. The control keys are arranged on the outer circumferential surface of the base 21, which means that the control keys are directly arranged on the outer side of the base 21, or a control panel is connected to the side of the base 21, and the control member is arranged on the control panel. Optionally, a circuit board is arranged in the base 21, and the controller is arranged on the circuit board. Pressing the control keys can trigger the control instruction of the controller to the drive piece 26, thereby controlling the start of the drive piece 26. Both control keys are start keys, and both hands need to be operated simultaneously to start.

[0087] In the scheme, the arrangement of the two control keys can prevent accidental touch.

[0088] Please combine Figure 1 and Figure 2 In an embodiment of the utility model, the mounting position 211 is a mounting groove, the base 21 is provided with an avoiding groove 212 on one side wall of the mounting groove, and the connector 27 is arranged in the avoiding groove 212.

[0089] The connector 27 is electrically connected with the voltage acquisition device 30, and the plug 271 of the connector 27 is arranged towards the mounting groove and is used for being inserted into the interface of the to-be-tested shunt.

[0090] In the embodiment, the mounting position 211 is a mounting groove, which means that a groove is formed on the surface of the base 21 to form the mounting position 211. The opening shape of the mounting groove matches the shape of the to-be-tested shunt, and the opening size of the mounting groove is adapted to the outer circumferential size of the to-be-tested shunt, so that the to-be-tested shunt can be directly placed in the mounting groove to achieve fixed limitation.

[0091] The avoiding groove 212 is communicated with the mounting groove, and the connector 27 is arranged in the avoiding groove 212, so that the cover body 22 does not affect the butt joint of the connecting part 23 and the to-be-tested shunt when the cover body 22 is rotated and closed. The connector 27 is electrically communicated with the voltage acquisition device 30 through a cable 25, a wire, or an interface in the base 21. The plug 271 of the connector 27 is arranged towards the mounting groove, so that the to-be-tested shunt is electrically connected with the connector 27 when the to-be-tested shunt is installed in the mounting groove. The plug 271 can be a profiled plug 271, and the to-be-tested shunt can be further fixed and limited.

[0092] In the scheme, the connector 27 not only plays an electrical connection role, but also plays a role in positioning the to-be-tested shunt in the direction perpendicular to the base 21, and the groove wall of the mounting groove positions the to-be-tested shunt in the circumferential direction, so that the to-be-tested shunt is installed stably and the detection precision is improved.

[0093] In an embodiment of the utility model, the surface of the cover 22 towards the installation position 211 is at least partially transparent.

[0094] In this embodiment, the cover 22 has a cover body and a surrounding plate arranged on the periphery of the cover body, and the surface of the cover 22 towards the installation position 211 refers to the cover body. At least part of the cover body is transparent, which means that the cover body can be entirely transparent, for example, the cover body is made of glass or transparent resin material. The cover body can also only set the position corresponding to the connecting part 23 as a transparent structure; or set the position corresponding to the connecting part 23 and the driving part 26 as a transparent structure.

[0095] In this scheme, the transparent structure facilitates monitoring of the detection situation in the detection device 20 and facilitates timely adjustment.

[0096] In an embodiment of the utility model, both connecting parts 23 are copper blocks.

[0097] In this embodiment, the copper block refers to a block structure made of copper, which has a certain cross-sectional area. Optionally, the cross section of the copper block has consistency in the thickness direction, and the cross-sectional shape is oval. The size of the copper block can be set according to the size of the shunt to be measured, and on the basis of increasing the contact area, it is not greater than the surface area of the shunt to be measured.

[0098] In this scheme, the cross section of the copper block is larger relative to the needle structure, thereby increasing the contact area with the shunt to be measured, reducing the impedance, and improving the detection accuracy.

[0099] Please refer to Figure 1 In addition, the detection device 20 is also provided with a cooling fan 28, which is installed on the cover 22 and located on one side of the connecting part 23. When the input current is large, the connecting part 23 can be cooled, effectively preventing heat concentration. Optionally, when the cover 22 and the base 21 are both cavity structures with openings, the side surface of the cover 22 and the side surface of the base 21 can be provided with cooling holes to improve the cooling effect of the detection device 20.

[0100] A handle is also provided on the side of the cover 22 away from the rotating connection position, which can provide a hand holding force, so that the cover 22 can be opened manually, which can be used in the case of checking failure or emergency shutdown, facilitating the opening of the cover 22.

[0101] In an embodiment of the utility model, the upper computer still controls the current source 10 to input at least two different value calibration currents to the to-be-tested shunt, the calibration current is greater than the calibration current, the upper computer obtains and processes the calibration current of current source 10 and the real-time calibration voltage value of voltage acquisition device 30 to calibrate the resistance precision of to-be-tested shunt.

[0102] In the embodiment, after the resistance calibration of the to-be-tested shunt is completed, the calibration resistance of the to-be-tested shunt is saved in the upper computer. The upper computer also detects the precision of the to-be-tested shunt under at least two different calibration currents. For example, the upper computer controls the current source 10 to input the first calibration current and the second calibration current to the to-be-tested shunt, and correspondingly obtains the first calibration voltage value and the second calibration voltage value. The upper computer obtains the first actual current value and the second actual current value according to the first calibration voltage value and the second calibration voltage value and the calibration resistance, respectively. By comparing the first actual current value with the first calibration current and comparing the second actual current value with the second calibration current, the detection precision range of the to-be-tested shunt can be determined. If the error is within the allowable range, it indicates that the calibration resistance of the to-be-tested shunt is relatively accurate. If the error is large, it indicates that the calibration resistance is not accurate enough, and needs to be recalibrated or set as unqualified.

[0103] The shunt testing device 100 can also detect the current detection precision of the to-be-tested shunt under a larger current value after the resistance calibration, and the detection standard is higher by using at least two different value calibration currents, which further improves the resistance precision of the to-be-tested shunt.

[0104] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made under the utility model concept of the utility model, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A shunt testing device, characterized by, The shunt testing device comprises: a current source for being connected in series with the shunt to be tested; a detection device having an open state and a closed state, the detection device being internally provided with a mounting position for mounting the shunt to be tested and two connection portions connected in series with the current source, the two connection portions abutting against two detection ends of the shunt to be tested in the closed state of the detection device, and the two connection portions being disconnected from the two detection ends of the shunt to be tested in the open state of the detection device; a voltage collection device for being electrically connected to both ends of the shunt to be tested to collect real-time calibration voltage values of the shunt to be tested; and a host computer in communication connection with the current source and the voltage collection device to obtain calibration current of the current source and real-time calibration voltage values of the voltage collection device, and to calibrate resistance value of the shunt to be tested.

2. The shunt testing device of claim 1, wherein, The detection device comprises a base and a cover rotatably connected to the base, the cover being rotatable relative to the base to have the open state and the closed state, the cover and the base enclosing a detection cavity in the closed state, the mounting position being arranged on the base, and the two connection portions being arranged on the cover in a spaced manner.

3. The shunt testing device of claim 2, wherein, A surface of the cover facing the base is provided with a mounting rack, and the two connection portions are arranged on a surface of the mounting rack facing the base in a spaced manner. The detection device further comprises two cables, one end of each cable penetrating into the base and being electrically connected to the current source, and the other end being arranged on a side of the mounting rack away from the base and being electrically connected to each connection portion through the mounting rack.

4. The shunt testing device of claim 2, wherein, The detection device further comprises a driving member, a fixed end of the driving member being connected to one of the base and the cover, and a driving end of the driving member being connected to the other one of the base and the cover, the driving member driving the cover and the base to be in the open state or the closed state.

5. The shunt testing device of claim 4, wherein, The driving member is provided in two, the fixed ends of the two driving members being respectively connected to opposite sides of the base, and the driving ends of the two driving members being respectively connected to two sides of the cover. The driving member is a pneumatic cylinder or an electric cylinder.

6. The shunt testing device of claim 4, wherein, The detection device further comprises a controller arranged in the base and being electrically connected to the driving member, the controller controlling the driving member to drive the cover and the base to be in the open state or the closed state. The controller is in communication connection with the host computer, the controller being configured to send a start detection signal to the host computer, and the host computer controlling the current source to input calibration current to the shunt to be tested.

7. The shunt testing device of claim 6, wherein, The base is provided with two control keys arranged in a spaced manner on an outer circumferential surface thereof, the two control keys being electrically connected to the controller and being configured to trigger the driving member.

8. The shunt testing device of claim 2, wherein, The mounting position is a mounting groove, the base is provided with an avoiding groove on a side wall of the mounting groove, and the avoiding groove is provided with a connector. The connector is electrically connected to the voltage collection device, a plug of the connector is arranged towards the mounting groove, and the plug is configured to be inserted into an interface of the shunt to be tested.

9. The shunt testing device of any one of claims 2 to 8, wherein, A surface of the cover facing the mounting position is at least partially transparent.

10. The shunt testing device of any one of claims 1 to 8, wherein, The two connection portions are copper blocks.

11. The shunt testing device of any one of claims 1 to 8, wherein, The host computer controls the current source to input at least two different calibration currents to the shunt to be tested, the calibration currents being greater than the standard current, and the host computer acquires and processes the calibration currents of the current source and the real-time calibration voltage values of the voltage acquisition device to calibrate the resistance precision of the shunt to be tested.

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