Temperature drift test fixture for linear variable differential transformer displacement sensor
By designing a temperature drift test fixture, the problem of precise positioning and movement control of the housing and pull rod of the linear differential transformer displacement sensor was solved, and high-precision temperature drift testing was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU HONGMING ELECTRONICS CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-07-10
AI Technical Summary
Existing technologies lack dedicated fixtures for fixing the housing of linear differential transformer displacement sensors and controlling the movement of the pull rod, making it difficult to meet the accuracy requirements of temperature drift test results and to adjust the relative position between the pull rod and the housing.
A temperature drift test fixture was designed, including components such as a base plate, a housing base, a housing connecting device, a tie rod base, a tie rod connecting device, a vertical fixing plate, and a horizontal guide rod. The precise positioning and movement control of the housing and tie rod are achieved by adjusting the bolts to ensure concentricity.
It achieves precise positioning of the housing of the linear differential transformer displacement sensor and precise movement control of the pull rod, ensuring the accuracy of the test results and meeting the temperature drift test requirements at specified locations.
Smart Images
Figure CN224480124U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a test fixture for a linear differential transformer displacement sensor, and more particularly to a temperature drift test fixture for a linear differential transformer displacement sensor. Background Technology
[0002] Linear differential transformer displacement sensors (LVDTs) are widely used in various sectors of the national economy, including aerospace, machinery, construction, textiles, railways, coal, metallurgy, plastics, chemicals, and scientific research institutions. They are used to control and feedback linear displacement signals and to measure parameters such as elongation, vibration, object thickness, and expansion. Their basic structure includes a housing, a coil frame, a coil assembly, an iron core, and a pull rod. The coil frame is installed inside the housing, the coil assembly is installed on the coil frame, and the iron core is placed in the central through hole of the coil frame. The inner end of the pull rod is connected to the iron core, and the outer end passes through the through hole at one end of the housing and is placed outside the housing.
[0003] After the linear differential transformer displacement sensor is manufactured, its temperature drift coefficient (i.e., the temperature drift coefficient, which is a quantitative indicator characterizing the change of parameters of the linear differential transformer displacement sensor with temperature) needs to be measured.
[0004] Traditional temperature drift testing methods for linear differential transformer displacement sensors lack dedicated auxiliary fixtures for securing the sensor housing and controlling the movement of the pull rod. Temperature drift is typically tested by natural placement. When measuring a specific location, the pull rod's position is usually determined by measuring the sensor's output voltage, and adjustment is only possible by manually pulling the rod. This method cannot precisely adjust the relative position between the pull rod and the housing, nor can it adjust the concentricity between them. Therefore, it is difficult to use this method for testing temperature drift at a specific location, and the test results often fail to meet accuracy requirements. Utility Model Content
[0005] The purpose of this invention is to provide a temperature drift test fixture for a linear differential transformer displacement sensor that can position the housing and control the movement of the pull rod in order to solve the above problems.
[0006] This utility model achieves the above objectives through the following technical solutions:
[0007] A temperature drift testing fixture for a linear differential transformer displacement sensor includes a base plate, a housing base, a housing connecting device, a tie rod base, a tie rod connecting device, a vertical fixing plate, a horizontal guide rod, a first horizontal adjusting bolt, and a second horizontal adjusting bolt. The housing base and the vertical fixing plate are respectively fixedly installed on the horizontally positioned top of the base plate. The tie rod base is placed on top of the base plate and located between the housing base and the vertical fixing plate. The housing connecting device is located on the upper part of the housing base and is used to install the housing of the linear differential transformer displacement sensor. The pull rod connecting device is located on the upper part of the pull rod base and is used to install the pull rod of the linear differential transformer displacement sensor. The two ends of the transverse guide rod are respectively connected to the housing base and the vertical fixing plate, the middle section passes through the corresponding through hole on the pull rod base, and the pull rod base can move freely in the axial direction of the transverse guide rod. The screw of the first transverse adjusting bolt passes through the transverse screw hole on the vertical fixing plate and contacts one side of the pull rod base. The screw of the second transverse adjusting bolt passes through the transverse screw hole on the housing base and contacts the other side of the pull rod base.
[0008] Preferably, in order to achieve better guiding function and facilitate assembly, the temperature drift test fixture for the linear differential transformer displacement sensor further includes a transverse compression spring and a fixing nut. There are two transverse guide rods, and two transverse compression springs are respectively fitted outside the two transverse guide rods and located between the vertical fixing plate and the pull rod base. The end of the two transverse guide rods near the vertical fixing plate is provided with an external thread and is respectively connected to the fixing nut. Both fixing nuts are located on the side of the vertical fixing plate away from the pull rod base.
[0009] Preferably, to facilitate reliable clamping of the housing, the housing connecting device includes a housing clamping plate, a first vertical guide rod, a first vertical adjusting bolt, and a first horizontal fixing plate. The horizontal housing clamping plate and the first horizontal fixing plate are sequentially placed above the housing base. The lower end of the first vertical guide rod is connected to the housing base, the upper end is connected to the first horizontal fixing plate, and the middle section passes through the corresponding through hole of the housing clamping plate, allowing the housing clamping plate to move freely in the axial direction of the first vertical guide rod. The screw of the first vertical adjusting bolt passes through the screw hole on the first horizontal fixing plate from top to bottom and then contacts the upper surface of the housing clamping plate.
[0010] Preferably, in order to more reliably clamp the housing and facilitate assembly, the housing connecting device further includes a first vertical compression spring. There are two first vertical guide rods, and two first vertical compression springs are respectively fitted outside the two first vertical guide rods and located between the housing base and the housing clamping plate. The upper ends of the two first vertical guide rods are respectively provided with external threads and are respectively connected to the first nuts. The two first nuts are located above the first horizontal fixing plate, and the first vertical adjusting bolt is located between the two first vertical guide rods.
[0011] Preferably, in order to clamp the housing more stably, the upper part of the housing base located between the two first vertical guide rods and the lower part of the housing clamping plate located between the two first vertical guide rods are respectively provided with housing clamping grooves for clamping the housing.
[0012] Preferably, to facilitate reliable clamping of the pull rod, the pull rod connecting device includes a first pull rod clamping plate, a second vertical guide rod, a second vertical adjusting bolt, and a second horizontal fixing plate. The first pull rod clamping plate and the second horizontal fixing plate are sequentially placed above the pull rod base. The lower end of the second vertical guide rod is connected to the pull rod base, the upper end is connected to the second horizontal fixing plate, and the middle section passes through the corresponding through hole of the first pull rod clamping plate, allowing the first pull rod clamping plate to move freely along the axial direction of the second vertical guide rod. The screw of the second vertical adjusting bolt passes through the screw hole on the second horizontal fixing plate from top to bottom and then contacts the upper surface of the first pull rod clamping plate.
[0013] Preferably, in order to more reliably clamp the pull rod and facilitate assembly, the pull rod connecting device further includes a second vertical compression spring. There are two second vertical guide rods, and two second vertical compression springs are respectively fitted outside the two second vertical guide rods and located between the pull rod base and the first pull rod clamping plate. The upper ends of the two second vertical guide rods are respectively provided with external threads and are respectively connected to the second nuts. The two second nuts are both located above the second horizontal fixing plate, and the second vertical adjusting bolt is located between the two second vertical guide rods.
[0014] Preferably, to facilitate reliable clamping of the pull rods of linear differential transformer displacement sensors of different sizes, the pull rod connecting device further includes a second pull rod clamping plate, an adjusting rod, an adjusting rack, a bearing, and a fixing screw. The second pull rod clamping plate is located horizontally between the first pull rod clamping plate and the pull rod base. Two second vertical compression springs pass through corresponding through holes on the second pull rod clamping plate, and the second pull rod clamping plate can move freely vertically. The upper part of the pull rod base is provided with a downwardly recessed square groove located between the two second vertical guide rods, and the vertical adjusting rack is placed in the square groove. The tie rod base has a transverse adjustment rod mounting hole near the square recess, which communicates with the square recess. The transverse adjustment rod is mounted in the adjustment rod mounting hole via the bearing. The outer circumference of the adjustment rod has a protruding adjustment gear that meshes with the adjustment rack. One side wall of the square recess has a transverse screw hole, and the fixing screw is installed in the screw hole. The inner end of the fixing screw contacts one side of the adjustment rack. The upper end of the adjustment rack passes through the upper opening of the square recess and contacts the lower part of the second tie rod clamp.
[0015] Preferably, in order to clamp the pull rod more stably, the upper part of the second pull rod clamping plate located between the two second vertical guide rods and the lower part of the first pull rod clamping plate located between the two first vertical guide rods are respectively provided with pull rod clamping grooves for clamping the pull rod.
[0016] The beneficial effects of this utility model are as follows:
[0017] This invention, through the design of a base plate, a housing base, a housing connecting device, a tie rod base, a tie rod connecting device, a vertical fixing plate, a horizontal guide rod, a first horizontal adjusting bolt, and a second horizontal adjusting bolt, allows the housing of a linear differential transformer displacement sensor to be mounted on the housing base, and the tie rod of the linear differential transformer displacement sensor to be mounted on the tie rod base. By adjusting the relative positions of the first and second horizontal adjusting bolts, the tie rod base can be moved laterally. By measuring the amount of displacement, the distance the tie rod moves can be determined, facilitating precise adjustment of the relative position between the tie rod and the housing. This enables the positioning of the housing and the control of the tie rod's movement, while ensuring the concentricity between the tie rod and the housing. Therefore, it can be used to test the temperature drift at a specified location, and the test results meet the accuracy requirements. Attached Figure Description
[0018] Figure 1 This is a perspective view of the temperature drift test fixture for the linear differential transformer displacement sensor described in this utility model before assembly;
[0019] Figure 2 This is a three-dimensional view of the assembled temperature drift test fixture for the linear differential transformer displacement sensor described in this utility model.
[0020] Figure 3 This is one of the perspective views of the pull rod base of the temperature drift test fixture for the linear differential transformer displacement sensor described in this utility model;
[0021] Figure 4 This is the second perspective view of the pull rod base of the temperature drift test fixture for the linear differential transformer displacement sensor described in this utility model;
[0022] Figure 5 This is a perspective view of the adjusting rod of the temperature drift test fixture for a linear differential transformer displacement sensor described in this utility model.
[0023] Figure 6 This is a perspective view of the temperature drift test fixture for the linear differential transformer displacement sensor described in this utility model. Detailed Implementation
[0024] The present invention will be further described below with reference to the accompanying drawings:
[0025] like Figures 1-5 As shown, the temperature drift test fixture for a linear differential transformer displacement sensor of this utility model includes a base plate 3, a housing base 25, a housing connecting device, a pull rod base 24, a pull rod connecting device, a vertical fixing plate 4, a horizontal guide rod 22, a first horizontal adjusting bolt 1, and a second horizontal adjusting bolt 26. The housing base 25 and the vertical fixing plate 4 are respectively fixedly installed on the horizontal base plate 3 by screws. The pull rod base 24 is placed on the base plate 3 and located between the housing base 25 and the vertical fixing plate 4. The housing connecting device is located on the upper part of the housing base 25 and is used to install the housing of the linear differential transformer displacement sensor (see reference). Figure 6 The housing 28 in the middle), the pull rod connecting device is located on the upper part of the pull rod base 24 and is used to install the pull rod of the linear differential transformer displacement sensor (see reference). Figure 6 The housing 27), the two ends of the transverse guide rod 22 are connected to the housing base 25 and the vertical fixing plate 4 respectively, the middle section passes through the corresponding through hole 242 on the tie rod base 24 and the tie rod base 24 can move freely in the axial direction of the transverse guide rod 22, the screw of the first transverse adjusting bolt 1 passes through the transverse screw hole on the vertical fixing plate 4 and contacts one side of the tie rod base 24, and the screw of the second transverse adjusting bolt 26 passes through the transverse screw hole on the housing base 26 and contacts the other side of the tie rod base 24.
[0026] like Figures 1-5 As shown, this utility model also discloses the following more optimized specific structures:
[0027] To achieve better guidance and facilitate assembly, the temperature drift test fixture for the linear differential transformer displacement sensor also includes a transverse compression spring 6 and a fixing nut 2. There are two transverse guide rods 22, and two transverse compression springs 6 are respectively fitted outside the two transverse guide rods 22 and located between the vertical fixing plate 4 and the pull rod base 24. The ends of the two transverse guide rods 22 closest to the vertical fixing plate 4 are provided with external threads and are respectively connected to the fixing nuts 2. The two fixing nuts 2 are both located on the side of the vertical fixing plate 4 away from the pull rod base 24.
[0028] To facilitate reliable clamping of the housing, the housing connection device includes a housing clamping plate 18, a first vertical guide rod 13, a first vertical adjusting bolt 11, and a first horizontal fixing plate 12. The horizontal housing clamping plate 18 and the first horizontal fixing plate 12 are sequentially placed above the housing base 25. The lower end of the first vertical guide rod 13 is connected to the housing base 25, the upper end is connected to the first horizontal fixing plate 12, and the middle section passes through the corresponding through hole of the housing clamping plate 18, allowing the housing clamping plate 18 to move freely axially along the first vertical guide rod 13. The screw of the first vertical adjusting bolt 11 passes through the screw hole on the first horizontal fixing plate 12 from top to bottom and then contacts the upper surface of the housing clamping plate 18.
[0029] To more reliably clamp the housing and facilitate assembly, the housing connection device further includes a first vertical compression spring 20. There are two first vertical guide rods 13. The two first vertical compression springs 20 are respectively fitted outside the two first vertical guide rods 13 and located between the housing base 25 and the housing clamping plate 18. The upper ends of the two first vertical guide rods 13 are respectively provided with external threads and are respectively connected to the first nuts (not marked in the figure). The two first nuts are located above the first horizontal fixing plate 12. The first vertical adjusting bolt 11 is located between the two first vertical guide rods 13.
[0030] To more stably clamp the housing, housing clamping grooves 21 (preferably "V" shaped grooves) for clamping the housing are provided on the upper part of the housing base 25 between the two first vertical guide rods 13 and on the lower part of the housing clamping plate 18 between the two first vertical guide rods 13.
[0031] To facilitate reliable clamping of the pull rod, the pull rod connecting device includes a first pull rod clamping plate 10, a second vertical guide rod 9, a second vertical adjusting bolt 8, and a second horizontal fixing plate 7. The first pull rod clamping plate 10 and the second horizontal fixing plate 7 are sequentially placed above the pull rod base 24. The lower end of the second vertical guide rod 9 is connected to the connecting hole 241 of the pull rod base 24, the upper end is connected to the second horizontal fixing plate 7, and the middle section passes through the corresponding through hole of the first pull rod clamping plate 10. The first pull rod clamping plate 10 can move freely in the axial direction of the second vertical guide rod 9. The screw of the second vertical adjusting bolt 8 passes through the screw hole on the second horizontal fixing plate 7 from top to bottom and then contacts the upper surface of the first pull rod clamping plate 10.
[0032] To more reliably clamp the pull rod and facilitate assembly, the pull rod connecting device also includes a second vertical compression spring 15. There are two second vertical guide rods 9. The two second vertical compression springs 15 are respectively fitted outside the two second vertical guide rods 9 and located between the pull rod base 24 and the first pull rod clamping plate 10. The upper ends of the two second vertical guide rods 9 are respectively provided with external threads and are respectively connected to the second nuts (not marked in the figure). The two second nuts are located above the second horizontal fixing plate 7. The second vertical adjusting bolt 8 is located between the two second vertical guide rods 9.
[0033] To facilitate reliable clamping of the pull rods of linear differential transformer displacement sensors of different sizes, the pull rod connecting device further includes a second pull rod clamping plate 16, an adjusting rod 19, an adjusting rack 17, a bearing 23, and a fixing screw 5. The horizontal second pull rod clamping plate 16 is located between the first pull rod clamping plate 10 and the pull rod base 24. Two second vertical compression springs 15 pass through corresponding through holes on the second pull rod clamping plate 16, and the second pull rod clamping plate 16 can move freely vertically. The upper part of the pull rod base 24 is provided with a downwardly recessed square groove 243 located between the two second vertical guide rods 9. The vertical adjusting rack 17 is placed in the square groove 243. The pull rod base 24 is provided with a horizontal adjusting rod mounting hole 245 near the square groove 243. The mounting hole 245 and the square recess 243 are connected through the transverse through hole 246. The transverse adjusting rod 19 is installed in the adjusting rod mounting hole 245 through the bearing 23. The outer circumference of the adjusting rod 19 is provided with a protruding adjusting gear 191, and the adjusting gear 191 is meshed with the adjusting rack 17 through the transverse through hole 247. One side wall of the square recess 243 is provided with a transverse screw hole 244, and the fixing screw 5 is installed in the screw hole 244. The inner end of the fixing screw 5 contacts one side of the adjusting rack 17. The upper end of the adjusting rack 17 passes through the upper opening of the square recess 243 and contacts the lower part of the second pull rod clamp 16. The outer end of the adjusting rod 19 is provided with an adjusting cap with an increased outer diameter, and the end face of the adjusting cap is provided with a hexagonal groove for cooperating with a hexagonal wrench.
[0034] To more stably clamp the pull rod, the upper part of the second pull rod clamping plate 16, located between the two second vertical guide rods 9, and the lower part of the first pull rod clamping plate 10, located between the two first vertical guide rods 9, are respectively provided with pull rod clamping grooves 14 (preferably "V" shaped grooves) for clamping the pull rod.
[0035] like Figures 1-6 As shown, in application, first place the housing 28 of the linear differential transformer displacement sensor on the housing clamping groove 21 of the housing base 25, then rotate the first vertical adjusting bolt 11 to push the housing clamping plate 18 downward until the groove wall of the housing clamping groove 21 of the housing clamping plate 18 is in close contact with the housing 28. Then loosen the first vertical adjusting bolt 11 to complete the tight clamping function of the housing 28. At this time, the pull rod 27 of the linear differential transformer displacement sensor is located above the pull rod clamping groove 14 of the second pull rod clamping plate 16. If the pull rod 27 does not contact the groove wall of the pull rod clamping groove 14 (which is generally the case), then rotate the adjusting rod 19. This causes the adjusting rack 17 to move upward, pushing the second pull rod clamp 16 upward until the pull rod 27 is in close contact with the groove wall of the pull rod clamping groove 14. If the pull rod 27 is already in close contact with the groove wall of the pull rod clamping groove 14, there is no need to rotate the adjusting rod 19. Then, rotate the fixing screw 5 so that its inner end presses against the side of the adjusting rack 17 to keep it stable. Then, rotate the second vertical adjusting bolt 8 to push the first pull rod clamp 10 downward until the groove wall of the pull rod clamping groove 14 of the first pull rod clamp 10 is in close contact with the pull rod 27. Then, loosen the second vertical adjusting bolt 8 to complete the function of tightly clamping the pull rod 27.
[0036] After clamping and installation, the lateral movement of the pull rod base 24 can be achieved by rotating the first lateral adjusting bolt 1 and the second lateral adjusting bolt 26, thus adjusting the relative position between the pull rod 27 and the housing 28. After adjusting to the starting point to be measured (generally the zero point), the pull rod base 24 is clamped by rotating the first lateral adjusting bolt 1 and the second lateral adjusting bolt 26. At this time, the distance between the pull rod base 24 and the housing base 25 can be measured with calipers. When it is necessary to measure the next position point, the pull rod base 24 is moved to the next position point by rotating the first lateral adjusting bolt 1 and the second lateral adjusting bolt 26. The distance between the pull rod base 24 and the housing base 25 is measured with calipers to determine the moving distance. The pull rod base 24 is then clamped by rotating the first lateral adjusting bolt 1 and the second lateral adjusting bolt 26 again. Then, a temperature drift test is performed, and finally, the temperature drift test of the pull rod 27 and the housing 28 of the linear differential transformer displacement sensor at the specified position point is achieved.
[0037] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.
Claims
1. A temperature drift testing fixture for a linear differential transformer displacement sensor, comprising a base plate, characterized in that: It also includes a housing base, a housing connecting device, a tie rod base, a tie rod connecting device, a vertical fixing plate, a horizontal guide rod, a first horizontal adjusting bolt, and a second horizontal adjusting bolt. The housing base and the vertical fixing plate are respectively fixedly installed on the horizontal base plate. The tie rod base is placed on the base plate and located between the housing base and the vertical fixing plate. The housing connecting device is located on the upper part of the housing base and is used to install the housing of the linear differential transformer displacement sensor. The tie rod connecting device is located on the upper part of the tie rod base and is used to install the tie rod of the linear differential transformer displacement sensor. The two ends of the horizontal guide rod are respectively connected to the housing base and the vertical fixing plate, and the middle section passes through the corresponding through hole on the tie rod base, and the tie rod base can move freely in the axial direction of the horizontal guide rod. The screw of the first horizontal adjusting bolt passes through the horizontal screw hole on the vertical fixing plate and contacts one side of the tie rod base. The screw of the second horizontal adjusting bolt passes through the horizontal screw hole on the housing base and contacts the other side of the tie rod base.
2. The temperature drift testing fixture for a linear differential transformer displacement sensor according to claim 1, characterized in that: The temperature drift test fixture for the linear differential transformer displacement sensor further includes a transverse compression spring and a fixing nut. There are two transverse guide rods, and two transverse compression springs are respectively fitted outside the two transverse guide rods and located between the vertical fixing plate and the pull rod base. The end of the two transverse guide rods near the vertical fixing plate is provided with an external thread and is respectively connected to the fixing nut. Both fixing nuts are located on the side of the vertical fixing plate away from the pull rod base.
3. The temperature drift testing fixture for a linear differential transformer displacement sensor according to claim 1 or 2, characterized in that: The housing connection device includes a housing clamping plate, a first vertical guide rod, a first vertical adjusting bolt, and a first horizontal fixing plate. The horizontal housing clamping plate and the first horizontal fixing plate are sequentially placed above the housing base. The lower end of the first vertical guide rod is connected to the housing base, the upper end is connected to the first horizontal fixing plate, and the middle section passes through the corresponding through hole of the housing clamping plate. The housing clamping plate can move freely in the axial direction of the first vertical guide rod. The screw of the first vertical adjusting bolt passes through the screw hole on the first horizontal fixing plate from top to bottom and then contacts the upper surface of the housing clamping plate.
4. The temperature drift testing fixture for a linear differential transformer displacement sensor according to claim 3, characterized in that: The housing connection device further includes a first vertical compression spring. There are two first vertical guide rods. The two first vertical compression springs are respectively fitted outside the two first vertical guide rods and located between the housing base and the housing clamping plate. The upper ends of the two first vertical guide rods are respectively provided with external threads and are respectively connected to the first nuts. The two first nuts are located above the first horizontal fixing plate. The first vertical adjusting bolt is located between the two first vertical guide rods.
5. The temperature drift testing fixture for a linear differential transformer displacement sensor according to claim 4, characterized in that: The upper part of the housing base, located between the two first vertical guide rods, and the lower part of the housing clamping plate, located between the two first vertical guide rods, are respectively provided with housing clamping grooves for clamping the housing.
6. The temperature drift test fixture for a linear differential transformer displacement sensor according to claim 1 or 2, characterized in that: The tie rod connecting device includes a first tie rod clamp plate, a second vertical guide rod, a second vertical adjusting bolt, and a second horizontal fixing plate. The first tie rod clamp plate and the second horizontal fixing plate are sequentially placed above the tie rod base. The lower end of the second vertical guide rod is connected to the tie rod base, the upper end is connected to the second horizontal fixing plate, and the middle section passes through the corresponding through hole of the first tie rod clamp plate. The first tie rod clamp plate can move freely in the axial direction of the second vertical guide rod. The screw of the second vertical adjusting bolt passes through the screw hole on the second horizontal fixing plate from top to bottom and then contacts the upper surface of the first tie rod clamp plate.
7. The temperature drift testing fixture for a linear differential transformer displacement sensor according to claim 6, characterized in that: The pull rod connecting device also includes a second vertical compression spring. There are two second vertical guide rods. The two second vertical compression springs are respectively fitted outside the two second vertical guide rods and located between the pull rod base and the first pull rod clamp. The upper ends of the two second vertical guide rods are respectively provided with external threads and are respectively connected to the second nuts. The two second nuts are located above the second horizontal fixing plate. The second vertical adjusting bolt is located between the two second vertical guide rods.
8. The temperature drift test fixture for a linear differential transformer displacement sensor according to claim 7, characterized in that: The pull rod connecting device further includes a second pull rod clamp plate, an adjusting rod, an adjusting rack, a bearing, and a fixing screw. The second pull rod clamp plate, which is horizontal, is located between the first pull rod clamp plate and the pull rod base. Two second vertical compression springs pass through corresponding through holes on the second pull rod clamp plate, and the second pull rod clamp plate can move freely vertically. The top of the pull rod base is provided with a downwardly recessed square groove located between the two second vertical guide rods. The vertical adjusting rack is placed in the square groove. The position of the pull rod base near the square groove is... A transverse adjusting rod mounting hole is provided, which communicates with the square recess. The transverse adjusting rod is mounted in the adjusting rod mounting hole through the bearing. The outer circumference of the adjusting rod is provided with a protruding adjusting gear, which meshes with the adjusting rack. One side wall of the square recess is provided with a transverse screw hole, and the fixing screw is installed in the screw hole. The inner end of the fixing screw contacts one side of the adjusting rack. The upper end of the adjusting rack passes through the upper opening of the square recess and contacts the lower part of the second pull rod clamp.
9. The temperature drift testing fixture for a linear differential transformer displacement sensor according to claim 8, characterized in that: The second pull rod clamping plate is provided with a pull rod clamping groove at the position between the two second vertical guide rods on the top and the first pull rod clamping plate is provided with a position between the two first vertical guide rods on the bottom for clamping the pull rod.