Lossless capacitance electrical testing mechanism

Abstract

The invention relates to a lossless capacitor electrical testing mechanism which comprises a clamping device, an electrical testing device and a driving device. The clamping device is used for fixing a capacitor to be tested; the electrical testing device is used for testing the electrical performance of the capacitor to be tested; the electrical testing device comprises a first probe and a second probe which are arranged oppositely and can move relatively. When the driving device drives the electrical testing device to move close to the clamping device, the first probe and the second probe are in contact with electrodes at the two 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; according to the lossless capacitor electrical testing mechanism, the contact force between the clamp and the capacitor and the contact force between the probe and the capacitor can be reduced, the problem that indentations are easily generated due to the fact that the probe and the suction nozzle have large pressing force on the capacitor in a traditional testing mechanism is solved, and testing damage to the to-be-tested capacitor is reduced or even completely avoided.

Description

Technical Field

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

[0002] Chip capacitors are usually packaged using surface mount technology (SMT), such as multilayer ceramic capacitors (MLCC) and single-layer ceramic capacitors (SLC), which helps to achieve miniaturization and high-density installation. Chip capacitors usually have smaller capacitance values, higher operating voltages, 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. In addition, chip capacitors usually have better temperature characteristics, and the capacitance value changes less with temperature, which is crucial to maintaining the stability of circuit performance. Chip capacitors are widely used in electronic devices such as portable devices, smart phones, and computers.

[0003] In the fields of semiconductor packaging testing or chip-level testing, a conductive nozzle and a copper probe are usually used to test the electrical performance of a capacitor: a conductive nozzle is used to suck from the upper surface of the capacitor, and the lower surface of the capacitor is pressed onto the copper probe. The conductive ring fixed on the nozzle contacts the conductive voltage arm to form a current loop. The conductive voltage arm is connected to the test line, and the copper probe is directly connected to the test line, so as to perform the test. However, in the above test method, when the capacitor is pressed against the probe on the probe base by the nozzle, the pressing force of the probe and the nozzle on the capacitor is relatively large, which is easy to produce indentations and damage the capacitor, causing test damage to the capacitor. Summary of the invention

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

[0005] A lossless capacitor electrical measurement mechanism comprises a clamping device, an electrical measurement device and a driving device; the clamping device is used to fix the capacitor to be measured; the electrical measurement device is used to test the electrical performance of the capacitor to be measured; the electrical measurement device comprises a first probe and a second probe which are arranged relatively and can move relatively; when the driving device drives the electrical measurement device to move close to the clamping device, the first probe and the second probe contact electrodes at both ends of the capacitor to be measured; when the driving device drives the electrical measurement device to move away from the clamping device, the first probe and the second probe leave the capacitor to be measured.

[0006] Compared with the conventional device that uses a conductive suction nozzle and a copper probe to fix a capacitor and test its 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 onto the probe on the probe base for testing, thereby solving the problem in the conventional testing invention that the probe and the suction nozzle have a large pressing force on the capacitor and are prone to produce 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 rapid action 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 mounting seat is connected to the electric measuring cam via a first electric measuring cam follower arranged on the first probe mounting seat, and the second probe mounting seat is connected to the electric measuring cam via a second electric measuring cam follower arranged on the second probe mounting seat. The present invention accurately converts rotary motion into linear or angular motion by respectively arranging an electric measuring cam follower between the electric measuring cam and the first probe mounting seat and the second probe mounting seat. It can flexibly adapt to different operation requirements according to the shape and motion parameters of the electric measuring cam, can realize a variety of motion forms, is conducive to realizing micro-motion, meets the requirements of higher motion accuracy, has a simple structure and stable operation, and has 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 the 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 movable 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 side of the clamping device; the front and rear cam followers are fixedly connected to the vertical plate seat and abut against the groove surface 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 setting the front and rear cams and the 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 small friction coefficient, large load bearing, 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, and the front and rear drive motors are axially connected to the front and rear cams through the coupling and the spline in turn; the spline is connected to the electric measuring cam through the transmission assembly. The present invention uses splines and transmission assemblies to connect the front and rear drive motors and the electric measuring cam, so that the vertical plate seat and the electric measuring device on the vertical plate seat can be axially moved, and torque can be accurately transmitted to the electric measuring cam, which has high reliability; the coupling is not only used to connect the front and rear drive motors and the spline, but also can compensate for the offset between the motor shaft and the spline during the test process, has the function of overload protection, 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 electric 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 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 be connected to the clamping cam respectively. The clamping device of the present invention is similar to the testing device, and the clamping cam is arranged to drive the first clamp mounting seat and the second clamp mounting seat to move relative to each other, 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 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. Similarly, the present invention flexibly adapts to the operation requirements of the clamp mounting seat and the clamp by respectively providing a clamping cam follower between the clamping cam and the first clamp mounting seat and the second clamp mounting seat, thereby realizing a variety of micro movements, meeting the requirements of high movement accuracy, and having high reliability.

[0014] Furthermore, the clamping device further comprises a clamping force adjustment screw connecting the first clamp and the second clamp, the head of the clamping force adjustment screw is arranged on the first clamp, and the tail of the clamping force adjustment screw is spirally connected to the second clamp, and the clamping force adjustment screw is rotated to move the second clamp relative to the second clamp mounting seat so as to be closer to or farther from the first clamp. The present invention can adjust the clamping force of the first clamp and the second clamp by arranging a clamping force adjustment screw connected to the first clamp and the second clamp, thereby preventing the clamping force of the clamp on the capacitor to be tested from being too large, thereby causing test damage to the capacitor.

[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 measurement 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 It is a structural schematic diagram of the clamping device of the lossless capacitance electric measuring mechanism of the present invention;

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

[0022] 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. It should be clear in the present application that the embodiments described are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the embodiments of the present 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 the present 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 of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0024] When the following description refers to the 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 only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0025] In the description of this application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to 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 measurement mechanism comprises a quick-change base 1 mounted on a device, a driving device 2, a clamping device 3 and an electrical measurement 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 measurement device 4 is used to test the electrical properties of the capacitor 5 to be measured; the driving device 2 drives the electrical measurement device 4 to move close 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 provided 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 driving device 2 further comprises a vertical plate seat 23 disposed between the machine body 221 and the clamping device 3 and movable relative to the clamping device 3, the vertical plate seat 23 comprising a bottom plate 231 disposed on the front and rear slide rails 211 and capable of sliding along the front and rear slide rails 211 and a vertical plate 232 vertically fixed to the upper surface of the bottom plate 231; the electric measuring device 4 is disposed at one end of the top of the vertical plate 232 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 so that the electric measuring device 4 approaches or moves away from the clamping device 3. The motor shaft 222 is provided with a front and rear cam 24 coaxially fixedly connected with the motor shaft 222, the front and rear cam 24 being a cylindrical cam with a curved groove on the side surface; the driving device 2 further comprises a front and rear cam follower 25 abutting against the groove surface of the front and rear cam 24 and capable of moving along the groove; the front and rear cam follower 25 is fixedly connected to the bottom plate 231. When the front and rear drive motor 22 is started, it drives the front and rear cams 24 to rotate, and the front and rear cam followers 25 move along the curved grooves of the front and rear cams 24, so that the bottom plate 231 fixedly connected to the front and rear cam followers 25 slides along the front and rear slide rails 211, and the vertical plate seat 23 and the electric measuring device 4 disposed on the top of the vertical plate 232 approach or move away from the clamping device 3. In actual production, technicians can design the length, outer diameter, geometric shape of the curved grooves of the front and rear cams 24, and select the appropriate output angle and speed of the front and rear drive motor 22 to coordinately control the moving direction, moving distance, moving speed, reciprocating frequency, etc. of the vertical plate seat 23 and the electric measuring device 4.

[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 arranged 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 arranged 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 arranged on the first clamp mounting seat 33; the first clamp mounting seat 32 and the second clamp mounting seat 33 are connected by 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 to be close to 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. In addition, 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 arranged on the first clamp 321, and the tail of the clamping force adjustment screw 36 is screwed to the second clamp 331. By rotating the clamping force adjustment screw 36, the second clamp 331 moves relative to the second clamp mounting seat 33 so as to be close to or away from the first clamp 321, thereby changing the distance between the second clamp 331 and the first clamp 321. The clamping device 3 also includes a clamping motor 37 fixed on 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 clamp and fix the side surface of the capacitor to be tested; 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 tested. In actual production, technicians can coordinately control the relative moving distance, moving direction, moving 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, a first probe 421 installed on the first probe mounting seat 42, a second probe mounting seat 43 and a second probe 431 installed on the second probe mounting seat 43, the first probe mounting seat 42 is installed above the second probe mounting seat 43 and can move relatively, the first probe 421 and the second probe 431 are arranged oppositely; an electric measuring cam 44 fixed to the vertical plate 232 is arranged 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 provided on the second probe mounting seat 43, and the first probe 421 and the second probe 431 are arranged oppositely; 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 A first electric measuring cam follower 422 of a probe mounting seat 42 is connected to the electric measuring cam 44, and the second probe mounting seat 43 is connected to the electric measuring cam 44 through a second electric measuring 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 measuring elastic connecting member 45 in a stretched state, and the electric measuring elastic connecting member 45 is preferably a spring; the electric measuring elastic connecting member 45 pulls the first probe mounting seat 42 and the second probe mounting seat 43 toward the electric measuring cam 44 and makes the first electric measuring cam follower 422 and the second electric measuring cam follower 432 abut against the side surface of the electric measuring 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 meshingly connected 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 to 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 to 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 driving 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 are close to 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 driving 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-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and the present invention is also intended to include these modifications and modifications.

Claims

1. A lossless capacitance electric measuring mechanism, characterized in that: The invention 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 performance of the capacitor to be tested; the electric measuring device comprises a first probe and a second probe which are arranged relatively and can move relatively; when the driving device drives the electric 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 tested; 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 electric measuring mechanism according to claim 1, characterized in that: 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, the first probe mounting seat and the second probe mounting seat are connected by an electrical measuring elastic connecting member in a stretched state, and the electrical measuring elastic connecting member pulls the first probe mounting seat and the second probe mounting seat to connect to the electrical measuring cam respectively.

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

4. The lossless capacitance electric measuring mechanism according to claim 1, characterized in that: 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 movable relative to the clamping device is provided between the body and the clamping device, and the electrical 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.

5. The lossless capacitance electric measuring mechanism according to claim 4, characterized in that: The driving device also includes a coupling, a spline and a transmission assembly sleeved on the motor shaft. The front and rear driving motors are axially connected to the front and rear cams through the coupling and the spline in sequence; the spline is connected to the electric measuring cam through the transmission assembly.

6. The lossless capacitance electric measuring mechanism according to claim 5, 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 transmission connected.

7. The lossless capacitance electric measuring 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.

8. The lossless capacitance electric measuring mechanism according to claim 7, characterized in that: The first clamp mounting seat is connected to the clamping cam via a first clamping cam follower arranged on the first clamp mounting seat, and the second clamp mounting seat is connected to the clamping cam via a second clamping cam follower arranged on the second clamp mounting seat.

9. The lossless capacitance electric measuring mechanism according to claim 7, 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 seat so as to move closer to or away from the first clamp.

10. The lossless capacitance electric measuring mechanism according to claim 5, 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 vertically fixed to the upper surface of the base plate; the first probe mounting seat, the second probe mounting seat, the electric measurement cam, and the transmission assembly are all arranged on the vertical plate.

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