A non-destructive capacitance electrical measurement mechanism

Abstract

The present invention relates to a lossless capacitor electrical testing mechanism, comprising: a clamping device, an electrical testing device, and a driving device; the clamping device is used to fix a capacitor to be tested; the electrical testing device is used to test the electrical properties of the capacitor to be tested; the electrical testing device comprises a first probe and a second probe which are arranged relatively and can move relative to each other; when the driving device drives the electrical testing device to move toward the clamping device, the first probe and the second probe contact electrodes at both ends of the capacitor to be tested; when the driving device drives the electrical testing device to move away from the clamping device, the first probe and the second probe leave the capacitor to be tested. The lossless capacitor electrical testing mechanism of the present invention can reduce the magnitude of the contact force between the clamp and the probe and the capacitor, thereby solving the problem in traditional testing inventions that the probe and the nozzle have a large pressing force on the capacitor and are prone to indentation, thereby reducing or even completely avoiding test damage to the capacitor to be tested.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, in particular to a lossless capacitance electrical measuring mechanism. Background Art

[0002] Chip capacitors typically utilize surface mount technology (SMT) packaging, such as multilayer ceramic capacitors (MLCCs) and single-layer ceramic capacitors (SLCs), which facilitate miniaturization and high-density mounting. Chip capacitors typically have smaller capacitance, higher operating voltage, and lower equivalent series resistance (ESR) and equivalent series inductance (ESL). They perform better in high-frequency applications and are suitable for decoupling and filtering in high-speed digital circuits. Furthermore, chip capacitors typically exhibit good temperature characteristics, with capacitance values varying slightly with temperature, which is crucial for maintaining stable circuit performance. Chip capacitors are widely used in electronic devices such as portable devices, smartphones, and computers.

[0003] In fields such as semiconductor packaging testing or chip-level testing, a conductive nozzle and copper probe are commonly used to test the electrical properties of capacitors. The nozzle is used to pick up the capacitor from its top surface and press its bottom surface against the copper probe. The nozzle's fixed conductive ring contacts the conductive voltage arm, forming a current loop. The conductive voltage arm is connected to the test lead, and the copper probe is directly connected to the test lead, allowing testing to proceed. However, in this testing method, when the nozzle presses the capacitor against the probe on the probe base, the pressure applied by the probe and nozzle is high, which can easily cause indentations and damage to the capacitor, resulting in test damage. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a lossless capacitor electrical testing mechanism that can reduce the contact force between the fixture and the probe and the capacitor, thereby reducing or even completely avoiding test damage to the capacitor to be tested during the electrical testing process.

[0005] A lossless capacitor electrical testing mechanism includes a clamping device, an electrical testing device, and a driving device; the clamping device is used to fix the capacitor to be tested; the electrical testing device is used to test the electrical properties of the capacitor to be tested; the electrical testing device includes a first probe and a second probe that are relatively arranged and movable; when the driving device drives the electrical testing device toward the clamping device, the first probe and the second probe contact electrodes at both ends of the capacitor to be tested; when the driving device drives the electrical testing device away from the clamping device, the first probe and the second probe leave the capacitor to be tested.

[0006] Compared with traditional devices that use conductive suction nozzles and copper probes to fix capacitors and test their electrical properties, the lossless capacitor electrical testing mechanism of the present invention uses a clamping device to fix the capacitor to be tested, and then uses an electrical testing device including a first probe and a second probe to test the electrical properties of the capacitor to be tested. There is no need to use a suction nozzle to press the capacitor against the probe on the probe base for testing, thereby solving the problem in traditional testing inventions that the probe and suction nozzle have a large pressing force on the capacitor and are prone to causing indentations, and will not cause test damage to the capacitor to be tested.

[0007] Furthermore, the electrical measuring device includes a first probe mounting seat and the first probe mounted on the first probe mounting seat, a second probe mounting seat and the second probe mounted on the second probe mounting seat, and an electrical measuring cam arranged between the first probe mounting seat and the second probe mounting seat; the first probe mounting seat and the second probe mounting seat can move relative to each other, and the first probe mounting seat and the second probe mounting seat are connected by an electrical measuring elastic connector in a stretched state, and the electrical measuring elastic connector pulls the first probe mounting seat and the second probe mounting seat to connect to the electrical measuring cam respectively. The present invention drives the first probe on the first probe mounting seat and the second probe on the second probe mounting seat to contact or leave the electrodes at both ends of the capacitor to be measured by setting an electrical measuring cam. The electrical measuring cam and the first probe mounting seat and the second probe mounting seat of the present invention have a relatively simple structure, can accurately control high-speed movement, are suitable for fast actions in electrical performance testing, have a small footprint, are suitable for confined spaces, have a low failure rate, are relatively easy to maintain and replace, help reduce maintenance costs, and are suitable for a wider range of working environments.

[0008] Furthermore, the first probe mount is connected to the electric cam via a first electric cam follower provided on the first probe mount, and the second probe mount is connected to the electric cam via a second electric cam follower provided on the second probe mount. The present invention precisely converts rotational motion into linear or angular motion by providing an electric cam follower between the electric cam and the first and second probe mounts, respectively. This allows for flexible adaptation to different operational requirements based on the shape and motion parameters of the electric cam, enabling multiple motion forms, facilitating micro-motion, and meeting high motion precision requirements. The present invention has a simple structure, stable operation, and high reliability.

[0009] Furthermore, the driving device includes a vertical plate seat, front and rear driving motors, front and rear cams, and front and rear cam followers; the driving motor includes a body and a motor shaft; the motor shaft is connected to the clamping device; the motor shaft is provided with front and rear cams having curved grooves on one side surface, and the front and rear cams are coaxially fixedly connected to the motor shaft; the vertical plate seat that can move relative to the clamping device is provided between the body and the clamping device, and the electric measuring device is fixed to the top of the vertical plate seat facing the clamping device; the front and rear cam followers are fixedly connected to the vertical plate seat and abut against the groove surfaces of the front and rear cams. The present invention controls the vertical plate seat and the electric measuring device on the vertical plate seat to approach or move away from the clamping device by providing front and rear cams and front and rear cam followers. The present invention can accurately realize the complex reciprocating motion of the electric measuring device through a driving device with a simple structure, and has the characteristics of low friction coefficient, large load bearing capacity, good rotation performance and easy installation.

[0010] Furthermore, the drive device also includes a coupling, a spline, and a transmission assembly sleeved on the motor shaft. The front and rear drive motors are axially connected to the front and rear cams via the coupling and the spline in turn; the spline is connected to the electric measuring cam via the transmission assembly. The present invention connects the front and rear drive motors and the electric measuring cam using splines and a transmission assembly, thereby achieving axial movement of the vertical plate seat and the electric measuring device on the vertical plate seat while accurately transmitting torque to the electric measuring cam, thereby having high reliability. The coupling is not only used to connect the front and rear drive motors and the spline, but also to compensate for the offset between the motor shaft and the spline during the test process, and has an overload protection function, reduces wear, and improves transmission efficiency. The drive device has a simple structure, saves space, is easy to assemble and disassemble, and is convenient for maintenance and replacement.

[0011] Furthermore, the spline includes a spline shaft sleeved on the motor shaft and a spline sleeve sleeved on the surface of the spline shaft and meshingly connected with the spline shaft; the transmission assembly includes a first synchronous wheel sleeved on the outer surface of the spline sleeve and a second synchronous wheel fixedly connected to the electrical measuring cam, and the first synchronous wheel and the second synchronous wheel are transmission-connected.

[0012] Furthermore, the clamping device includes a first clamp mounting seat and a first clamp mounted on the first clamp mounting seat, a second clamp mounting seat and a second clamp mounted on the second clamp mounting seat, an electric measuring cam arranged between the first clamp mounting seat and the second clamp mounting seat, and a clamping motor axially fixedly connected to the electric measuring cam; the first clamp mounting seat and the second clamp mounting seat can move relative to each other, and the first clamp and the second clamp are arranged relative to each other; the first clamp mounting seat and the second clamp mounting seat are connected by a clamping elastic connector in a stretched state, and the clamping elastic connector pulls the first clamp mounting seat and the second clamp mounting seat to connect to the clamping cam respectively. The clamping device of the present invention is similar to the test device, and the clamping cam is set to drive the relative movement of the first clamp mounting seat and the second clamp mounting seat, thereby accurately and quickly controlling the first clamp and the second clamp to clamp and release the capacitor to be tested.

[0013] Furthermore, the first clamp mount is connected to the clamping cam via a first clamping cam follower provided on the first clamp mount, and the second clamp mount is connected to the clamping cam via a second clamping cam follower provided on the second clamp mount. Similarly, by providing a clamping cam follower between the clamping cam and the first clamp mount and the second clamp mount, respectively, the present invention flexibly adapts to the operational requirements of the clamp mount and the clamp, achieving a variety of micro-movements, meeting the requirements of high motion precision, and achieving high reliability.

[0014] Furthermore, the clamping device further includes a clamping force adjustment screw connecting the first clamp and the second clamp. The head of the clamping force adjustment screw is disposed on the first clamp, and the tail of the clamping force adjustment screw is screwed to the second clamp. Rotating the clamping force adjustment screw causes the second clamp to move relative to the second clamp mounting base, thereby moving closer to or further away from the first clamp. The present invention provides a clamping force adjustment screw connected to the first clamp and the second clamp to adjust the clamping force of the first clamp and the second clamp, thereby preventing the clamps from applying excessive clamping force to the capacitor under test, thereby causing damage to the capacitor during testing.

[0015] Furthermore, the driving device also includes a test base plate, the front and rear driving motors are fixed to one end of the upper surface of the test base plate, and the clamping base is fixed to the other end of the upper surface of the test base plate; the upper surface of the test base plate between the front and rear driving motors and the clamping base is provided with front and rear slide rails guiding the clamping base; the vertical plate seat includes a base plate that can slide along the front and rear slide rails and a vertical plate vertically fixed to the upper surface of the base plate; the first probe mounting seat, the second probe mounting seat, the electric measuring cam, and the transmission assembly are all arranged on the vertical plate.

[0016] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a right side view of the lossless capacitance electric measuring mechanism of the present invention;

[0018] Figure 2 It is a left side view of the lossless capacitance electric measuring mechanism of the present invention;

[0019] Figure 3 for Figure 2 A is an enlarged schematic diagram;

[0020] Figure 4 Schematic diagram of the structure of the clamping device of the lossless capacitance electrical measurement mechanism of the present invention;

[0021] Figure 5 It is a structural schematic diagram of the electrical measuring device of the lossless capacitance electrical measuring mechanism of the present invention. DETAILED DESCRIPTION

[0022] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of this application. It should be made clear in this application that the embodiments described are only some embodiments of the embodiments of this application, not all embodiments. Based on the embodiments in the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the embodiments of this application.

[0023] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application. The singular forms "a," "the," and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0024] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0025] In the description of this application, it should be understood that the terms "first," "second," "third," etc. are used only to distinguish similar objects, and are not necessarily used to describe a specific order or precedence, nor should they be understood to indicate or imply relative importance. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] It should be understood that the embodiments of the present application are not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the embodiments of the present application is limited only by the appended claims.

[0029] See also Figures 1-2 A lossless capacitor electrical measuring mechanism includes a quick-change base 1 mounted on a device, a driving device 2, a clamping device 3 and an electrical measuring device 4; the driving device 2 and the clamping device 3 are fixedly arranged on the upper surface of the quick-change base 1; the clamping device 3 is used to fix the capacitor 5 to be measured; the electrical measuring device 4 is used to test the electrical properties of the capacitor 5 to be measured; the driving device 2 drives the electrical measuring device 4 to move closer to or away from the clamping device 3.

[0030] The driving device 2 includes a test base plate 21 installed on the quick-change base 1, and a front and rear driving motor 22 fixed to the left end of the upper surface of the test base plate 21; the clamping device 3 is fixed to the right end of the upper surface of the test base plate 21; the driving motor 22 includes a body 221 and a motor shaft 222; the motor shaft 222 is connected to the clamping device 3; the upper surface of the test base plate 21 between the front and rear driving motors 22 and the clamping device 3 is equipped with front and rear slide rails 211 guiding the clamping device 3, and the front and rear guide rails 211 are parallel to the motor shaft 222. The drive device 2 also includes a vertical plate seat 23 disposed between the body 221 and the clamping device 3 and movable relative to the clamping device 3. The vertical plate seat 23 includes a base plate 231 disposed on the front and rear slide rails 211 and slidable along the front and rear slide rails 211, and a vertical plate 232 vertically fixed to the upper surface of the base plate 231. The electrical measuring device 4 is disposed on the top of the vertical plate 232 at one end facing the clamping device 3. The vertical plate seat 23 moves relative to the clamping device 3 along the front and rear slide rails 211, causing the electrical measuring device 4 to move closer to or further away from the clamping device 3. The motor shaft 222 is provided with a front and rear cam 24 coaxially fixedly connected to the motor shaft 222. The front and rear cam 24 is a cylindrical cam having a curved groove on its side surface. The drive device 2 also includes a front and rear cam follower 25 that abuts the groove surface of the front and rear cam 24 and is movable along the groove. The front and rear cam follower 25 is fixedly connected to the base plate 231. When the front-to-back drive motor 22 is activated, it drives the front-to-back cams 24 to rotate, causing the front-to-back cam followers 25 to move along the curved grooves of the front-to-back cams 24, causing the base plate 231 fixedly connected to the front-to-back cam followers 25 to slide along the front-to-back slide rails 211, causing the vertical plate seat 23 and the electrical measuring device 4 disposed on the top of the vertical plate 232 to move closer to or further away from the clamping device 3. In actual production, technicians can coordinately control the movement direction, movement distance, movement speed, reciprocating frequency, etc. of the vertical plate seat 23 and the electrical measuring device 4 by designing the length, outer diameter, and geometric shape of the curved grooves of the front-to-back cams 24, and selecting an appropriate output angle and rotation speed of the front-to-back drive motor 22.

[0031] See also Figure 4The clamping device 3 includes the clamping base 31 fixed to the right end of the test base plate 21, and the motor shaft 222 of the front and rear drive motor 22 passes through the vertical plate 232 and is fixedly connected to the clamping base 31; the clamping device 3 also includes a first clamp mounting seat 32 arranged on the top of the clamping base 31 and a first clamp 321, a second clamp mounting seat 33 and a second clamp 331 installed on the second clamp mounting seat 33, the first clamp mounting seat 32 and the second clamp mounting seat 33 are arranged relative to each other and can move relative to each other, the first clamp 321 and the second clamp 331 are arranged relative to each other and can move relative to each other; a clamping cam 34 fixed to the clamping base 31 is provided between the first clamp mounting seat 32 and the second clamp mounting seat 33, The clamping cam 34 is a disc-type cam; the first clamp mounting seat 32 is connected to the clamping cam 34 through a first clamping cam follower 322 provided on the first clamp mounting seat 32, and the second clamp mounting seat 33 is connected to the clamping cam 34 through a second clamping cam follower 332 provided on the first clamp mounting seat 33; the first clamp mounting seat 32 and the second clamp mounting seat 33 are connected through a clamping elastic connecting member 35 in a stretched state, and the clamping elastic connecting member 35 is preferably a spring; the clamping elastic connecting member 35 pulls the first clamp mounting seat 32 and the second clamp mounting seat 33 toward the clamping cam 34 for connection and makes the first clamping cam follower 322 and the second clamping cam follower 332 abut against the side surface of the clamping cam 34. Furthermore, the first clamp 321 and the second clamp 331 are connected by a clamping force adjustment screw 36. The head of the clamping force adjustment screw 36 is disposed on the first clamp 321, and the tail thereof is screwedly connected to the second clamp 331. Rotating the clamping force adjustment screw 36 causes the second clamp 331 to move relative to the second clamp mounting base 33, thereby moving closer to or further away from the first clamp 321, thereby changing the distance between the second clamp 331 and the first clamp 321. The clamping device 3 further includes a clamping motor 37 fixed to the clamping base 31 and coaxially connected to the clamping cam 34.When the clamping motor 37 drives the clamping cam 34 to rotate, when the first clamp 321 and the second clamp 331 are connected to the arc surface with a smaller radius of the clamping cam 34, the distance between the first clamp mounting seat 32 and the second clamp mounting seat 33 is reduced, and the first clamp 321 and the second clamp 331 are relatively close to clamping and fixing the side surface of the capacitor to be measured; when the first clamp 321 and the second clamp 331 are connected to the arc surface with a larger radius of the clamping cam 34, the distance between the first clamp mounting seat 32 and the second clamp mounting seat 33 increases, and the first clamp 321 and the second clamp 331 are relatively far away from releasing the capacitor to be measured. In actual production, technicians can coordinately control the relative movement distance, movement direction, movement speed, reciprocating frequency, etc. between the first clamp 321 and the second clamp 331 by designing the geometric shapes such as the arc surface and base circle size of the clamping cam 34 and selecting the output angle and speed of the clamping motor 37.

[0032] See also Figure 5 The electric measuring device 4 includes a first probe mounting seat 42 arranged on the top of the vertical plate 232 facing the side of the clamping device 3 and a first probe 421 mounted on the first probe mounting seat 42, a second probe mounting seat 43 and a second probe 431 mounted on the second probe mounting seat 43, the first probe mounting seat 42 is mounted above the second probe mounting seat 43 and can move relative to each other, the first probe 421 and the second probe 431 are arranged opposite to each other; an electric measuring cam 44 fixed to the vertical plate 232 is provided between the first probe mounting seat 42 and the second probe mounting seat 43, and the electric measuring cam 44 is a disc-shaped cam; the first probe mounting seat 42 is provided with a first probe 421 and a second probe 431 are installed on the second probe mounting seat 43, ... arranged opposite to each other; an electric measuring cam 44 fixed to the vertical plate 232 is provided between the first probe mounting seat 42 and the second probe mounting seat 43, and the electric measuring cam 44 is a disc-shaped cam; the first probe mounting seat 42 is provided with a The first electric cam follower 422 of a probe mounting seat 42 is connected to the electric cam 44, and the second probe mounting seat 43 is connected to the electric cam 44 through a second electric cam follower 432 arranged on the second probe mounting seat 43; the first probe mounting seat 42 and the second probe mounting seat 43 are connected through an electric elastic connecting member 45 in a stretched state, and the electric elastic connecting member 45 is preferably a spring; the electric elastic connecting member 45 pulls the first probe mounting seat 42 and the second probe mounting seat 43 toward the electric cam 44 and makes the first electric cam follower 422 and the second electric cam follower 432 abut against the side surface of the electric cam 44.

[0033] See also Figure 3The driving device 2 also includes a coupling 26 and a spline (not shown) sleeved on the motor shaft 222; the spline includes a spline shaft sleeved on the motor shaft 222 and a spline sleeve sleeved on the surface of the spline shaft and meshing with the spline shaft; the front and rear driving motors 22 are axially connected to the front and rear cams 24 in turn through the coupling 26 and the spline shaft. The spline is connected to the electric measuring cam 44 through a transmission assembly 28; specifically, the transmission assembly 28 includes a first synchronous wheel 281 sleeved on the outer surface of the spline sleeve and fixed to the vertical plate 232, and a second synchronous wheel 282 fixed on one end of the vertical plate 232 on the same side as the first synchronous wheel 281 and axially fixedly connected to the electric measuring cam 44, and the first synchronous wheel 281 and the second synchronous wheel 282 are connected and driven by a belt; in other embodiments, the electric measuring device 4 also includes an idler wheel 283 for changing the transmission direction of the first synchronous wheel 281 and the second synchronous wheel 282, and the idler wheel 283 is fixed on one end of the vertical plate 232 on the same side as the first synchronous wheel 281, and is connected and driven by the first synchronous wheel 281 and the second synchronous wheel 282 through a belt.

[0034] When the front and rear drive motor 22 drives the front and rear cams 24 to rotate, so that the vertical plate seat 23 and the first probe mounting seat 42 and the first probe 421, the second probe mounting seat 43 and the second probe 431 arranged on the top of the vertical plate 232 approach the clamping device 3, the spline transmits the torque of the front and rear cams 24, and controls the rotation of the electrical measuring cam 44 through the transmission assembly 28, so that the first probe mounting seat 42 and the first electrical measuring cam follower 422, the second probe mounting seat 43 and the second electrical measuring cam follower 432 simultaneously change from abutting against the arc surface with a larger radius of the electrical measuring cam 44 to abutting against the arc surface with a smaller radius of the electrical measuring cam 44, the distance between the first probe mounting seat 42 and the second probe mounting seat 43 becomes smaller, the first probe 421 and the second probe 431 approach each other, and lightly touch the electrodes on the upper and lower surfaces of the capacitor to be tested fixed by the first fixture 321 and the second fixture 331, thereby realizing the electrical performance test of the capacitor to be tested. On the contrary, when the front and rear drive motor 22 drives the first probe mounting seat 42 and the first probe 421, the second probe mounting seat 43 and the second probe 431 away from the clamping device 3, the first probe mounting seat 42 and the first electrical measuring cam follower 422, the second probe mounting seat 43 and the second electrical measuring cam follower 432 simultaneously change from abutting against the arc surface with a smaller radius of the electrical measuring cam 44 to abutting against the arc surface with a larger radius of the electrical measuring cam 44, and the first probe 421 and the second probe 431 leave the upper and lower surfaces of the capacitor to be tested, thereby completing the electrical performance test of one of the capacitors to be tested.

[0035] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. A lossless capacitance electrical measurement mechanism, characterized in that: The electric measuring device comprises a clamping device, an electric measuring device and a driving device; the clamping device is used to fix the capacitor to be tested; the electric measuring device is used to test the electrical properties of the capacitor to be tested; the electric measuring device comprises a first probe mounting seat and the first probe mounted on the first probe mounting seat, a second probe mounting seat and the second probe mounted on the second probe mounting seat, an electric measuring cam arranged between the first probe mounting seat and the second probe mounting seat; the first probe and the second probe are relatively arranged and can move relatively; the first probe mounting seat and the second probe mounting seat can move relative to each other, the first probe mounting seat and the second probe mounting seat are connected by an electric measuring elastic connecting member in a stretched state, the electric measuring elastic connecting member pulls the first probe mounting seat and the second probe mounting seat to connect to the electric measuring cam respectively; the driving device comprises a vertical plate seat, front and rear drive motors, front and rear cams and front and rear cam followers; the front and rear drive motors The cam is connected to the clamping device; the motor shaft is provided with front and rear cams having a curved groove on one side surface, and the front and rear cams are coaxially fixedly connected to the motor shaft; a vertical plate seat that can move relative to the clamping device is provided between the machine body and the clamping device, and the electrical measuring device is fixed to the top of the vertical plate seat on the side facing the clamping device; the front and rear cam followers are fixedly connected to the vertical plate seat and abut against the groove surfaces of the front and rear cams; the driving device also includes a spline and a transmission assembly sleeved on the motor shaft, the spline is connected to the electrical measuring cam through the transmission assembly; when the driving device drives the electrical measuring device to move close to the clamping device, the first probe and the second probe contact the electrodes at both ends of the capacitor to be measured; when the driving device drives the electrical measuring device to move away from the clamping device, the first probe and the second probe leave the capacitor to be measured.

2. The lossless capacitance measuring mechanism according to claim 1, characterized in that: The first probe mounting seat is connected to the electric cam via a first electric cam follower provided on the first probe mounting seat, and the second probe mounting seat is connected to the electric cam via a second electric cam follower provided on the second probe mounting seat.

3. The lossless capacitance measuring mechanism according to claim 1, characterized in that: The driving device further comprises a coupling sleeved on the motor shaft, and the front and rear driving motors are axially connected to the front and rear cams in sequence through the coupling and the spline.

4. The lossless capacitance electrical measurement mechanism according to claim 3, characterized in that: The spline includes a spline shaft sleeved on the motor shaft and a spline sleeve sleeved on the surface of the spline shaft and meshingly connected with the spline shaft; the transmission assembly includes a first synchronous wheel sleeved on the outer surface of the spline sleeve and a second synchronous wheel fixedly connected to the electric measuring cam, and the first synchronous wheel and the second synchronous wheel are in transmission connection.

5. The lossless capacitance electrical measurement mechanism according to claim 1, characterized in that: The clamping device includes a first clamp mounting seat and a first clamp mounted on the first clamp mounting seat, a second clamp mounting seat and a second clamp mounted on the second clamp mounting seat, an electric measuring cam arranged between the first clamp mounting seat and the second clamp mounting seat, and a clamping motor axially fixedly connected to the electric measuring cam; the first clamp mounting seat and the second clamp mounting seat can move relative to each other, and the first clamp and the second clamp are arranged opposite to each other; the first clamp mounting seat and the second clamp mounting seat are connected by a clamping elastic connecting member in a stretched state, and the clamping elastic connecting member pulls the first clamp mounting seat and the second clamp mounting seat to connect with the clamping cam respectively.

6. The lossless capacitance electrical measurement mechanism according to claim 5, characterized in that: The first clamp mounting seat is connected to the clamping cam via a first clamping cam follower provided on the first clamp mounting seat, and the second clamp mounting seat is connected to the clamping cam via a second clamping cam follower provided on the second clamp mounting seat.

7. The lossless capacitance electrical measurement mechanism according to claim 5, characterized in that: The clamping device also includes a clamping force adjustment screw connecting the first clamp and the second clamp. The head of the clamping force adjustment screw is set on the first clamp, and the tail of the clamping force adjustment screw is spirally connected to the second clamp. Rotating the clamping force adjustment screw causes the second clamp to move relative to the second clamp mounting base so as to move closer to or away from the first clamp.

8. The lossless capacitance electrical measurement mechanism according to claim 3, characterized in that: The driving device also includes a test base plate, the front and rear driving motors are fixed to one end of the upper surface of the test base plate, and the clamping device is fixed to the other end of the upper surface of the test base plate; the upper surface of the test base plate between the front and rear driving motors and the clamping device is provided with front and rear slide rails guiding the clamping base; the vertical plate seat includes a base plate that can slide along the front and rear slide rails and a vertical plate fixed vertically to the upper surface of the base plate; the first probe mounting seat, the second probe mounting seat, the electric measuring cam, and the transmission assembly are all arranged on the vertical plate.

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