Clamping device for calibrating eddy current displacement sensor

Abstract

The invention relates to the technical field of sensor clamping devices for calibration equipment, in particular to a clamping device for calibration of an eddy current displacement sensor, which comprises a frame, a rectangular cavity is arranged in the frame, two clamping plates are symmetrically arranged on the upper side and the lower side of the rectangular cavity, and a manual driving assembly provides power to drive a differential transmission assembly. The differential transmission assembly transmits power to the lead screw driving assembly through the lead screw transmission assembly, and the two clamping plates are driven by the lead screw driving assembly to move oppositely in the rectangular cavity. When one of the two clamping plates is blocked in movement due to displacement to the position in contact with the eddy current displacement sensor, and the other clamping plate is not in contact with the eddy current displacement sensor, the power provided by the manual driving assembly can continuously drive the other clamping plate to move to the position in contact with the eddy current displacement sensor. The invention provides a clamping device capable of clamping eddy current displacement sensors of different manufacturers, different specifications and different surface conditions.

Description

Technical Field

[0001] This invention relates to the field of sensor clamping devices for calibration equipment, and more particularly to a clamping device for calibrating an eddy current displacement sensor. Background Technology

[0002] In the power, energy, and metering industries, eddy current displacement sensors require regular calibration or measurement, according to calibration standard JJG. Standard 664-2003 outlines metrological verification procedures for eddy current displacement sensors. This involves aligning the sensor with a metal target and moving the target to perform the verification. Compared to newly manufactured eddy current displacement sensors, those regularly sent to testing centers present several challenges. Firstly, a wide variety of models exist, with numerous manufacturers offering sensors of varying diameters, lengths, and thread types. Secondly, some sensors are located in areas with intense vibrations, sometimes requiring the addition of metal blocks to enhance installation reliability, which disrupts the original axisymmetric shape. For these diverse sensors from different manufacturers, one approach is to create various threaded adapters. These adapters have uniform external threads that mate with the threaded holes on the mounting bracket, while the internal threads vary, resulting in different specifications. Different adapters are then made to match the specific eddy current displacement sensor model. Another approach is to create a rubber ring, softly encasing the sensor and then securing it with screws.

[0003] Both of the above-mentioned fixing methods have been applied. The first method can meet the application scenarios where the surface of the eddy current displacement sensor is not damaged. However, it requires the fabrication of a threaded adapter for each type of eddy current displacement sensor. When dealing with eddy current displacement sensors with new interfaces, it can easily lead to excessively long metrological verification work. Eddy current displacement sensors removed from the front line often require rapid metrological verification and reinstallation. This method is not suitable when there is no corresponding threaded adapter or when the sensor thread is damaged. The second method uses a soft covering to fix the eddy current displacement sensor, which can adapt to the fixing of eddy current displacement sensors with different types of interfaces within a certain range. However, this design has two problems: first, it is difficult to control the perpendicularity to the target surface after fixing; second, it is difficult to fix eddy current displacement sensors with protruding metal blocks on the surface. Some metrological verification units also use both eddy current displacement sensor fixing methods. However, this only solves the application and clamping problem of new threaded interfaces without corresponding threaded adapters. It still cannot solve the problem of surface damage such as metal protrusions, and it also does not solve the problem of difficulty in controlling the perpendicularity to the target surface after the rubber ring is clamped.

[0004] Therefore, it is necessary to design a device that can solve the problem of clamping standard, common eddy current displacement sensors, as well as the problem of clamping eddy current sensors with metal blocks welded to their surfaces or with damaged threaded interfaces, and the problem of clamping eddy current displacement sensors without threads, so as to achieve clamping of eddy current displacement sensors from different manufacturers, with different specifications and with different surface conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a clamping device for calibrating an eddy current displacement sensor, so as to solve the technical problems existing in the background art.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A clamping device for calibrating an eddy current displacement sensor includes a frame and clamping plates. The frame has a rectangular cavity inside, and two clamping plates are symmetrically arranged on the upper and lower sides of the rectangular cavity. A lead screw drive assembly, a lead screw transmission assembly, a differential transmission assembly, and a manual drive assembly are respectively mounted on the frame. The manual drive assembly provides power to drive the differential transmission assembly, which in turn transmits the power through the lead screw transmission assembly to the lead screw drive assembly. The lead screw drive assembly drives the two clamping plates to move towards each other within the rectangular cavity. When one of the clamping plates is obstructed from moving to a position where it contacts the eddy current displacement sensor, while the other has not yet made contact, the power provided by the manual drive assembly can continue to drive the other clamping plate to move to the position where it contacts the eddy current displacement sensor.

[0007] Furthermore, the lead screw drive assembly includes: an inner lead screw, an outer lead screw, and threaded sleeves. A slot is provided in the middle of the two clamping plates on opposite sides. Two inner lead screw holes and two outer lead screw holes are symmetrically provided at the left and right ends of each clamping plate. The two outer lead screw holes are located outside the two inner lead screw holes. Four threaded sleeves are provided, two of which are coaxially fixedly connected to the two inner lead screw holes on the upper clamping plate, and the other two are coaxially fixedly connected to the two outer lead screw holes on the lower clamping plate. The inner and outer lead screws are located on the left and right sides respectively. Two symmetrically arranged internal lead screws are respectively vertically penetrating and threadedly connected to two threaded sleeves on the upper clamping plate. The two internal lead screws also movably penetrate two internal lead screw holes on the lower clamping plate. The two external lead screws movably penetrate two external lead screw holes on the upper clamping plate. The two external lead screws also vertically penetrating and threadedly connected to two threaded sleeves on the lower clamping plate. The axial ends of the internal and external lead screws are respectively penetrating and rotatably connected to the frame. The bottom end of the internal lead screw and the top end of the external lead screw are coaxially fixedly connected to a bevel gear.

[0008] Furthermore, the threads of the two internal screws are in opposite directions, the threads of the two external screws are in opposite directions, and the threads of the internal and external screws on the same side are in opposite directions.

[0009] Furthermore, the lead screw drive assembly also includes: bearing 1, of which eight are provided; four circular holes 1 and four circular holes 2 are symmetrically opened on the left and right sides of the frame, respectively; the circular holes 1 and circular holes 2 are vertically penetrating vertically and communicating with the rectangular cavity; the axial ends of the two inner lead screws are coaxially rotatably installed in the four circular holes 1 through the four bearings, and the axial ends of the two outer lead screws are coaxially rotatably installed in the four circular holes 2 through the four bearings.

[0010] Furthermore, the lead screw drive assembly includes: a lead screw drive rod, a second bevel gear, and a third bevel gear. Two lead screw drive rods and two third bevel gears are symmetrically arranged vertically. Four second bevel gears are provided. Two strip-shaped protrusions are symmetrically arranged at the upper and lower ends of the outer wall of the frame. These strip-shaped protrusions are located in the middle between two circular holes on the same side. Two lead screw drive rods pass horizontally through and rotatably connect to the two strip-shaped protrusions. Two second bevel gears, symmetrically arranged horizontally, are sleeved and fixed on the lead screw drive rod. The two upper second bevel gears mesh with two first bevel gears at the top ends of two outer lead screws, and the two lower second bevel gears mesh with two first bevel gears at the bottom ends of two inner lead screws. A third bevel gear is coaxially sleeved and fixed on the right side of the second bevel gear located on the right side of the lead screw drive rod.

[0011] Furthermore, the lead screw drive assembly also includes: bearing two, of which four bearing two are provided; a transverse through-hole three is provided on the strip-shaped protrusion; two lead screw drive rods are respectively transversely through the two through-hole three on the two strip-shaped protrusions; and the two lead screw drive rods are respectively rotatably mounted in the two through-hole three on the two strip-shaped protrusions through the four bearing two.

[0012] Furthermore, the differential transmission assembly includes: a differential transmission rod, a fourth bevel gear, a differential rotating frame, a fifth bevel gear, a connecting shaft, a sixth bevel gear, and a seventh bevel gear. A rectangular mounting hole penetrating from front to back is provided in the middle of the right side of the frame. Two copies of each of the differential transmission rod, fourth bevel gear, fifth bevel gear, connecting shaft, and sixth bevel gear are provided. Two differential transmission rods vertically penetrate and rotatably connect to the upper and lower ends of the right side of the frame. Two fourth bevel gears are coaxially fixedly connected to the opposite ends of the two differential transmission rods. The differential rotating frame is cylindrical and has a rectangular hole penetrating from front to back. The differential rotating frame is movably mounted within the rectangular mounting hole. Two through holes are symmetrically provided at both axial ends of the differential rotating frame. Two fifth bevel gears are symmetrically fixedly installed inside the rectangular holes at the opposite ends of the two differential transmission rods. The two differential transmission rods are rotatably connected to the two through holes. Two sixth bevel gears are rotatably connected to the left and right ends of the rectangular hole via two connecting shafts. The sixth bevel gears mesh with the two fifth bevel gears. A seventh bevel gear is coaxially fixedly connected to the bottom end of the differential rotating frame.

[0013] Furthermore, the differential transmission assembly also includes: bearing three, of which four bearing three are provided, and two circular holes four are symmetrically opened at the upper and lower ends of the right side of the frame, both of which are connected to rectangular mounting holes, and the two differential transmission rods are respectively rotatably installed in the two circular holes four through the four bearing three.

[0014] Furthermore, the manual drive assembly includes: a bevel gear eight, a drive shaft, and a hand-tightening knob. The bevel gear eight meshes with a bevel gear seven. The bevel gear eight is coaxially and fixedly connected to one end of the drive shaft. The drive shaft passes laterally through and rotates through the connecting frame. The other end of the drive shaft is fixedly connected to a hand-tightening knob.

[0015] Furthermore, the manual drive assembly also includes: a bearing four, a circular hole five is provided on the lower right side of the frame, the circular hole five extends laterally into the rectangular mounting hole, and the drive shaft is rotatably mounted on the circular hole five through the bearing four.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention provides power through a manual drive component to drive a differential transmission component. The differential transmission component transmits the power to a lead screw drive component via a lead screw transmission component. The lead screw drive component then drives two clamping plates to move towards each other within a rectangular cavity. Compared to using threaded adapter holes, the clamping device of this invention can accommodate various types, threads, and diameters of eddy current displacement sensors. It also allows for flexible adjustment of the clamping centerline position, enabling the clamping of eddy current displacement sensors at any desired location. After clamping, the sensor is locked in a set position. Compared to fixing eddy current displacement sensors with rubber rings, the clamping device of this invention has superior verticality retention and better human-machine interaction, achieving faster and more reliable clamping. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a transverse longitudinal sectional view of the present invention; Figure 3 This is the front view of the present invention; Figure 4 This is a structural view of the frame in this invention; Figure 5 This is a structural view of the present invention after the frame has been removed; Figure 6 This is a structural view of the clamping plate in this invention; Figure 7 This is a structural view of the differential rotating frame and its connecting components in this invention; Figure 8 This is a structural view of the present invention when clamping a conventional eddy current displacement sensor; Figure 9 This is a structural view of the present invention when the eddy current displacement sensor with a protruding metal block on the clamping surface is being held. Figure 10 This is a structural view of the invention when it is installed on a horizontal slide.

[0018] The labels in the attached diagram are as follows: 1-Frame, 101-Rectangular cavity, 102-Strip protrusion, 103-Circular hole three, 104-Circular hole one, 105-Circular hole two, 106-Rectangular mounting hole, 107-Circular hole four, 108-Circular hole five, 2-Clamping plate, 201-Slot, 202-Internal threaded rod hole, 203-External threaded rod hole, 3-Internal threaded rod, 4-External threaded rod, 5-Bearing one, 6-Threaded sleeve, 7-Bevel gear one, 8-Threaded rod drive rod, 9-Bearing two. 10-Bevel gear two, 11-Bevel gear three, 12-Differential transmission rod, 13-Bearing three, 14-Bevel gear four, 15-Differential rotating frame, 16-Bevel gear five, 17-Connecting shaft, 18-Bevel gear six, 19-Bevel gear seven, 20-Bevel gear eight, 21-Drive shaft, 22-Bearing four, 23-Hand-tightening knob, 24-Conventional eddy current displacement sensor, 25-Eddy current displacement sensor with raised metal blocks on the surface, 26-Slider, 27-Guide rail. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] See Figures 1-10 As shown, a clamping device for calibrating an eddy current displacement sensor includes a frame 1 and clamping plates 2. The frame 1 has a rectangular cavity 101 inside, and two clamping plates 2 are symmetrically arranged on the upper and lower sides of the rectangular cavity 101. A lead screw drive assembly, a lead screw transmission assembly, a differential transmission assembly, and a manual drive assembly are respectively installed on the frame 1. The manual drive assembly provides power to drive the differential transmission assembly, which in turn transmits the power to the lead screw drive assembly via the lead screw transmission assembly. The lead screw drive assembly drives the two clamping plates 2 to move towards each other in the rectangular cavity 101. When one of the two clamping plates 2 is obstructed from moving to a position that contacts the eddy current displacement sensor, while the other has not yet made contact with the eddy current displacement sensor, the power provided by the manual drive assembly can continue to drive the other clamping plate to move to a position that contacts the eddy current displacement sensor.

[0021] The lead screw drive assembly includes an inner lead screw 3, an outer lead screw 4, and a threaded sleeve 6. Each of the two clamping plates 2 has a slot 201 in the middle of its opposite side. The slot 201 has a V-shaped cross-section and is used to constrain the eddy current displacement sensor to the center position of the clamping plate 2. In practical applications, the clamping contact surface of the clamping plate 2 is selected from materials with a lower hardness than the surface of the object to be clamped. For example, when the eddy current displacement sensor is made of steel, a low-strength aluminum alloy is selected as the contact material; when the eddy current displacement sensor is made of aluminum alloy, plastic is selected as the contact material. The contact material can be surface-mounted onto the contact surface, and the appropriate notch size can be selected according to the diameter distribution of the object to be clamped. Good control of the clamping point is achieved through the selection of the contact surface. The clamping plate 2 has two symmetrically opened inner lead screw holes 202 and two outer lead screw holes 203 at its left and right ends, respectively. The two outer lead screw holes 203 are located outside the two inner lead screw holes 202. Four threaded sleeves 6 are provided, two of which are coaxial. Two internal threaded rods 3 and two external threaded rods 4 are fixedly connected to the upper clamping plate 2 in two internal threaded rod holes 202, and two others are coaxially fixedly connected to the lower clamping plate 2 in two external threaded rod holes 203. There are two internal threaded rods 3 and two external threaded rods 4 symmetrically arranged on the left and right. The two internal threaded rods 3 are vertically inserted and threaded to the two threaded sleeves 6 on the upper clamping plate 2. The two internal threaded rods 3 also movably insert through the two internal threaded rod holes 202 on the lower clamping plate 2. The two external threaded rods 4 are movably inserted through the two external threaded rod holes 203 on the upper clamping plate 2. The two external threaded rods 4 also vertically insert through and threaded to the two threaded sleeves 6 on the lower clamping plate 2. The axial ends of the internal threaded rods 3 and the external threaded rods 4 are respectively inserted through and rotatably connected to the frame 1. The bottom end of the internal threaded rod 3 and the top end of the external threaded rod 4 are coaxially fixedly connected to a bevel gear 7. The thread directions of the two internal threaded rods 3 and the two external threaded rods 4 are opposite. The thread directions of the internal threaded rods 3 and the external threaded rods 4 on the same side are opposite.

[0022] The lead screw drive assembly also includes: bearing 1 5, of which eight bearing 1 5 are provided. Four circular holes 1 104 and four circular holes 2 105 are symmetrically opened on the left and right sides of the frame 1, respectively. The circular holes 1 104 and the circular holes 2 105 are vertically penetrating and communicating with the rectangular cavity 101. The axial ends of the two inner lead screws 3 are coaxially rotatably installed in the four circular holes 1 104 through the four bearing 1 5, and the axial ends of the two outer lead screws 4 are coaxially rotatably installed in the four circular holes 2 105 through the four bearing 1 5.

[0023] The lead screw drive assembly includes: a lead screw drive rod 8, a second bevel gear 10, and a third bevel gear 11. Two lead screw drive rods 8 and two third bevel gears 11 are symmetrically arranged vertically. Four second bevel gears 10 are provided. Two strip-shaped protrusions 102 are symmetrically arranged at the upper and lower ends of the outer wall of the frame 1. The strip-shaped protrusions 102 are located in the middle between two circular holes 104 on the same side. Two lead screw drive rods 8 pass horizontally through and rotatably connect to the two strip-shaped protrusions 102. Two second bevel gears 10 are fixedly sleeved on the lead screw drive rod 8, symmetrically arranged horizontally. The two upper second bevel gears 10 mesh with two first bevel gears 7 at the top ends of the two outer lead screws 4, and the two lower second bevel gears 10 mesh with two first bevel gears 7 at the bottom ends of the two inner lead screws 3. A third bevel gear 11 is coaxially sleeved and fixed on the right side of the second bevel gear 10 located on the right side of the lead screw drive rod 8.

[0024] The lead screw drive assembly also includes: bearing 2 9, of which four bearing 2 9 are provided. A transverse through round hole 3 103 is provided on the strip-shaped protrusion 102. Two lead screw drive rods 8 are transversely through the round holes 3 103 on the two strip-shaped protrusions 102 respectively. The two lead screw drive rods 8 are rotatably mounted in the round holes 3 103 on the two strip-shaped protrusions 102 respectively through the four bearing 2 9.

[0025] The differential transmission assembly includes: a differential transmission rod 12, a fourth bevel gear 14, a differential swivel frame 15, a fifth bevel gear 16, a connecting shaft 17, a sixth bevel gear 18, and a seventh bevel gear 19. A rectangular mounting hole 106, penetrating from front to back, is provided in the middle of the right side of the frame 1. Two differential transmission rods 12, two fourth bevel gears 14, two fifth bevel gears 16, a connecting shaft 17, and two sixth bevel gears 18 are provided. Two differential transmission rods 12 vertically penetrate and rotatably connect the upper and lower ends of the right side of the frame 1. Two fourth bevel gears 14 are coaxially fixedly connected to the opposite ends of the two differential transmission rods 12. The differential swivel frame 15 is circular. The differential rotating frame 15 is cylindrical and has a rectangular hole that runs through it from front to back. It is movably mounted in the rectangular mounting hole 106. Two through holes are symmetrically opened at both ends of the differential rotating frame 15 along its axial direction. The two differential transmission rods 12 pass through the two through holes at their opposite ends and are symmetrically fixedly installed inside the rectangular hole. The two differential transmission rods 12 are rotatably connected to the two through holes. The left and right ends of the rectangular hole are rotatably connected to two bevel gears 18 through two connecting shafts 17. The bevel gears 18 mesh with the two bevel gears 16 respectively. A bevel gear 19 is coaxially fixedly connected to the bottom end of the differential rotating frame 15.

[0026] The differential transmission assembly also includes: bearing three 13, of which four bearing three 13 are provided. Two circular holes four 107 are symmetrically opened at the upper and lower ends of the right side of the frame 1. Both circular holes four 107 are connected to the rectangular mounting holes 106. The two differential transmission rods 12 are respectively rotatably installed in the two circular holes four 107 through the four bearing three 13.

[0027] The manual drive assembly includes: bevel gear 8 20, drive shaft 21 and hand-tightening knob 23. Bevel gear 8 20 meshes with bevel gear 7 19. Bevel gear 8 20 is coaxially fixedly connected to one end of drive shaft 21. Drive shaft 21 passes laterally through and rotates through connecting frame 1. The other end of drive shaft 21 is fixedly connected to hand-tightening knob 23.

[0028] The manual drive assembly also includes: bearing 22, and a circular hole 108 is provided on the lower right side of the frame 1. The circular hole 108 extends laterally into the rectangular mounting hole 106. The drive shaft 21 is rotatably mounted on the circular hole 108 through the bearing 22.

[0029] It should be noted that in practical applications, frame 1 is also designed with an outer protective shell, which encloses the lead screw drive rod 8, bevel gear 1 7, bevel gear 2 10, bevel gear 3 11 and differential rotating frame 15, thus achieving full protection for each component.

[0030] Working principle: When it is necessary to clamp the eddy current displacement sensor, turn the hand knob 23. The hand knob 23 drives the bevel gear 19 through the bevel gear 8 20, which in turn drives the differential rotating frame 15 to rotate. At this time, there are two transmission operation modes. The first transmission operation mode: the upper clamping plate 2 and the lower clamping plate 2 are subjected to the same resistance. At this time, the differential rotating frame 15 rotates, driving the upper and lower differential transmission rods 12 to rotate simultaneously. The differential transmission rods 12 rotating in the same direction drive the lead screw transmission rods 8 installed on the upper and lower sides to rotate in opposite directions, and then transmit to the two inner lead screws 3 and the two outer lead screws 4. Since the thread directions of the two inner lead screws 3 are opposite and the thread directions of the two outer lead screws 4 are opposite, the thread directions of the inner lead screws 3 and the outer lead screws 4 on the same side are opposite, thus realizing the driving of the upper clamping plate 2 and the lower clamping plate 2 to move closer or further away from each other. The second transmission operation mode: The upper clamping plate 2 and the lower clamping plate 2 experience different motion resistances, that is, when encountering a non-axisymmetric eddy current displacement sensor (due to foreign objects or extra metal blocks on the threads), or when the clamping center position is manually changed, the upper clamping plate 2 and the lower clamping plate 2 experience different resistances. In this case, when the hand-turning knob 23 is rotated, the differential rotation frame 15 rotates. At this time, the upper or lower clamping plate 2 stops moving due to the resistance. The resistance is transmitted to the corresponding differential transmission rod 12, and one of the two differential transmission rods 12 on the side with resistance stops rotating. When the differential rotating frame 15 is rotated, the bevel gear 16 on the obstructed side stops rotating. However, as the bevel gear 18 rotates, the other bevel gear 16 can still rotate, driving the clamping plate 2, which has not stopped moving due to obstruction, to continue moving and clamp the eddy current displacement sensor. When both the upper and lower clamping plates 2 are in contact with the part to be clamped, the preload is applied to the hand-tightening knob 23, and the eddy current displacement sensor is clamped. The preload of the clamped eddy current displacement sensor is locked by the self-locking of the two inner screws 3, the two outer screws 4, and the four threaded sleeves 6.

[0031] See Figure 8 This device holds a conventional eddy current displacement sensor 24, see [link / reference]. Figure 9 The device clamps an eddy current displacement sensor 25 with a raised metal block on its clamping surface. As can be seen from the operation of the device, the device can reliably clamp an eddy current displacement sensor of any shape at any position.

[0032] In addition, this device can be installed in various scenarios, see [link / reference] Figure 10 This device can be installed on a vertical or horizontal slide (the slide includes a base, guide rail 27 and slider 26) to clamp the eddy current displacement sensor at different positions; it can also be installed on a rotating table to clamp the eddy current displacement sensor at different relative angles.

[0033] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A clamping device for calibrating an eddy current displacement sensor, characterized in that, include: The frame (1) and clamping plates (2) are provided. The frame (1) has a rectangular cavity (101) inside. Two clamping plates (2) are symmetrically arranged on the upper and lower sides of the rectangular cavity (101). The frame (1) is equipped with a screw drive assembly, a screw transmission assembly, a differential transmission assembly and a manual drive assembly. The manual drive assembly provides power to drive the differential transmission assembly. The differential transmission assembly transmits the power to the screw drive assembly through the screw transmission assembly. The screw drive assembly drives the two clamping plates (2) to move towards each other in the rectangular cavity (101). When one of the two clamping plates (2) is obstructed from moving to the position where it contacts the eddy current displacement sensor, while the other has not yet contacted the eddy current displacement sensor, the power provided by the manual drive assembly can continue to drive the other clamping plate to move to the position where it contacts the eddy current displacement sensor.

2. The clamping device for calibrating an eddy current displacement sensor according to claim 1, characterized in that: The lead screw drive assembly includes: an inner lead screw (3), an outer lead screw (4), and a threaded sleeve (6). A slot (201) is provided in the middle of each of the two clamping plates (2) facing each other. Two inner lead screw holes (202) and two outer lead screw holes (203) are symmetrically provided at the left and right ends of the clamping plates (2), respectively. The two outer lead screw holes (203) are located outside the two inner lead screw holes (202). Four threaded sleeves (6) are provided, two of which are coaxially fixedly connected to the two inner lead screw holes (202) on the upper clamping plate (2), and the other two are coaxially fixedly connected to the two outer lead screw holes (203) on the lower clamping plate (2). The inner lead screw (3) and the outer lead screw (4) are both located on the left and right sides. Two screws are arranged symmetrically on the right. The two inner screws (3) are vertically inserted and threaded to the two threaded sleeves (6) on the upper clamping plate (2). The two inner screws (3) are also movable through the two inner screw holes (202) on the lower clamping plate (2). The two outer screws (4) are movable through the two outer screw holes (203) on the upper clamping plate (2). The two outer screws (4) are also vertically inserted and threaded to the two threaded sleeves (6) on the lower clamping plate (2). The axial ends of the inner screws (3) and the outer screws (4) are respectively inserted and rotatably connected to the frame (1). The bottom end of the inner screw (3) and the top end of the outer screw (4) are coaxially fixedly connected to a bevel gear (7).

3. The clamping device for calibrating an eddy current displacement sensor according to claim 2, characterized in that: The threads of the two inner screws (3) are opposite, the threads of the two outer screws (4) are opposite, and the threads of the inner screws (3) and outer screws (4) on the same side are opposite.

4. The clamping device for calibrating an eddy current displacement sensor according to claim 2, characterized in that: The lead screw drive assembly further includes: bearing one (5), there are eight bearings one (5), and four circular holes one (104) and four circular holes two (105) are symmetrically opened on the left and right sides of the frame (1). The circular holes one (104) and circular holes two (105) are vertically penetrating and connected to the rectangular cavity (101) respectively. The axial ends of the two inner lead screws (3) are coaxially rotatably installed in the four circular holes one (104) through the four bearings one (5) respectively. The axial ends of the two outer lead screws (4) are coaxially rotatably installed in the four circular holes two (105) through the four bearings one (5) respectively.

5. The clamping device for calibrating an eddy current displacement sensor according to claim 4, characterized in that: The lead screw drive assembly includes: a lead screw drive rod (8), a second bevel gear (10), and a third bevel gear (11). There are two lead screw drive rods (8) and two bevel gears (11) arranged symmetrically on the top and bottom. There are four bevel gears (10). The outer wall of the frame (1) is symmetrically provided with two strip-shaped protrusions (102) at the top and bottom ends. The strip-shaped protrusions (102) are located in the middle between two circular holes (104) on the same side on the top and bottom. The two lead screw drive rods (8) pass through laterally and are rotatably connected. Two strip-shaped protrusions (102) are provided. Two bevel gears (10) are fixedly mounted on the screw drive rod (8) and arranged symmetrically on the left and right. The two bevel gears (10) on the upper side mesh with the two bevel gears (7) at the top end of the two outer screws (4) respectively. The two bevel gears (10) on the lower side mesh with the two bevel gears (7) at the bottom end of the two inner screws (3) respectively. A bevel gear (11) is fixedly mounted on the right side of the bevel gear (10) on the right side of the screw drive rod (8).

6. The clamping device for calibrating an eddy current displacement sensor according to claim 5, characterized in that: The lead screw drive assembly further includes: bearing two (9), four bearing two (9) are provided, and a transverse through round hole three (103) is provided on the strip-shaped protrusion (102). Two lead screw drive rods (8) are transversely through the round hole three (103) on the two strip-shaped protrusions (102) respectively. The two lead screw drive rods (8) are rotatably installed in the round hole three (103) on the two strip-shaped protrusions (102) respectively through the four bearing two (9).

7. The clamping device for calibrating an eddy current displacement sensor according to claim 5, characterized in that: The differential transmission assembly includes: a differential transmission rod (12), a fourth bevel gear (14), a differential rotating frame (15), a fifth bevel gear (16), a connecting shaft (17), a sixth bevel gear (18), and a seventh bevel gear (19). A rectangular mounting hole (106) is provided in the middle of the right side of the frame (1). Two of each of the differential transmission rod (12), the fourth bevel gear (14), the fifth bevel gear (16), the connecting shaft (17), and the sixth bevel gear (18) are provided. The two differential transmission rods (12) are vertically connected to the upper and lower ends of the right side of the frame (1) and rotate. The two fourth bevel gears (14) are coaxially fixed to the opposite ends of the two differential transmission rods (12). The differential rotating frame... (15) is cylindrical and has a rectangular hole that runs through the front and back. The differential rotating frame (15) is movably installed in the rectangular mounting hole (106). The differential rotating frame (15) has two through holes symmetrically opened at both ends of its axial direction. The two differential transmission rods (12) pass through the two through holes respectively and two bevel gears five (16) are symmetrically fixedly installed inside the rectangular hole. The two differential transmission rods (12) are rotatably connected to the two through holes. The left and right ends of the rectangular hole are rotatably connected to two bevel gears six (18) respectively through two connecting shafts (17). The bevel gears six (18) mesh with the two bevel gears five (16) respectively. The bottom end of the differential rotating frame (15) is coaxially fixedly connected to a bevel gear seven (19).

8. The clamping device for calibrating an eddy current displacement sensor according to claim 7, characterized in that: The differential transmission assembly also includes: bearing three (13), four bearing three (13) are provided, and two circular holes four (107) are symmetrically opened at the upper and lower ends of the right side of the frame (1). The two circular holes four (107) are connected to the rectangular mounting holes (106). The two differential transmission rods (12) are respectively rotatably installed in the two circular holes four (107) through the four bearing three (13).

9. A clamping device for calibrating an eddy current displacement sensor according to claim 7, characterized in that: The manual drive assembly includes: a bevel gear eight (20), a drive shaft (21), and a hand-tightening knob (23). The bevel gear eight (20) meshes with a bevel gear seven (19). The bevel gear eight (20) is coaxially fixedly connected to one end of the drive shaft (21). The drive shaft (21) passes through and rotates through the connecting frame (1). The other end of the drive shaft (21) is fixedly connected to the hand-tightening knob (23).

10. A clamping device for calibrating an eddy current displacement sensor according to claim 9, characterized in that: The manual drive assembly also includes: bearing four (22), and a circular hole five (108) is provided on the lower right side of the frame (1). The circular hole five (108) extends laterally into the rectangular mounting hole (106). The drive shaft (21) is rotatably mounted on the circular hole five (108) through the bearing four (22).

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