High-precision non-contact displacement measuring device and measuring method

Abstract

The invention discloses a high-precision non-contact displacement measuring device and method, and belongs to the technical field of displacement measuring devices.The high-precision non-contact displacement measuring device comprises a measuring machine body, a base is arranged at the bottom end in the measuring machine body, an upper fixing frame is arranged at the upper end in the measuring machine body, and buffering and damping assemblies are symmetrically arranged in the base; a universal arm is arranged at the upper end of the buffering and damping assembly, an adjusting and mounting assembly is arranged on the surface of the universal arm, a non-contact displacement sensor is arranged at one end of the adjusting and mounting assembly, and a positioning meshing assembly is arranged in the middle of the upper end of the base; according to the invention, the non-contact displacement sensor can be conveniently installed by arranging the adjusting installation assembly, the use stability of the equipment is improved, the use quality is ensured, the installation steps are simple and convenient, manpower resources are saved, the use effect of the equipment is good, the height adjustment of the non-contact displacement sensor is accurate and stable, and the measurement error is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of displacement measuring devices, and in particular relates to a high-precision non-contact displacement measuring device and a measuring method. Background Art

[0002] Displacement measuring instruments are mechanical measuring instruments that measure the linear displacement or angular displacement of a rigid body during translation or rotation. They are used to measure mechanical displacement, geometric parameters (size, surface shape, etc.) of mechanical parts, and to continuously measure the geometric dimensions of steel plates, paper, rubber, etc. during processing. Displacement measuring instruments consist of displacement sensors, measuring circuits, and indicators. Displacement sensors can be divided into two categories according to the type of output signal: analog displacement sensors and digital displacement sensors.

[0003] Chinese patent application No. 201821592744.7 discloses a non-contact separated continuous displacement measuring device for a universal material testing machine, including an existing universal material testing machine, a universal arm, a special clamp and a non-contact displacement sensor. The universal material testing machine clamps the two ends of the specimen by a clamp, and the special clamp is clamped at the upper and lower displacement observation points of the specimen to provide a signal reflection surface. The non-contact displacement sensor is symmetrically arranged between the upper and lower signal reflection surfaces of the specimen. The non-contact displacement sensor is fixed on the universal arm, and the universal arm is fixed on a wall or the ground outside the universal material testing machine. Advantages of this application: The principle of this testing machine is simple and clear, no special accessories or equipment are required, the cost is low, the versatility is strong, it is durable, there are no consumables, the measurement data is complete and reliable, and the accuracy is high; it is easy to operate and easy to control, and can be tested and measured continuously, the detection efficiency is greatly improved, and it is convenient for existing equipment to be directly modified and upgraded.

[0004] The above-mentioned published patents exist when in use:

[0005] 1. It is inconvenient to disassemble and replace the non-contact displacement sensor, which affects the convenience of equipment use and reduces measurement efficiency. In addition, the positioning of the non-contact displacement sensor is not accurate during use, which affects the measurement effect.

[0006] 2. It is inconvenient to install the test piece during use, which affects the efficiency of the equipment. The test piece will shake, affecting the measurement quality. It is inconvenient to measure the tensile force during the deformation of the test piece, and the equipment is not suitable for use.

[0007] 3. During the measurement process, the sensor will be disturbed by vibration, which will affect the measurement accuracy, cause data errors, waste human resources, and increase the cost of measurement. Summary of the invention

[0008] In order to solve the problems raised in the above background technology, the present invention provides a high-precision non-contact displacement measuring device, which has the characteristics of stable use of the sensor, firm and convenient installation of the test piece and high working stability of the equipment.

[0009] The invention also provides a high-precision non-contact displacement measuring device and a measuring method.

[0010] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-precision non-contact displacement measuring device, comprising a measuring body, a base is arranged at the inner bottom end of the measuring body, an upper fixing frame is arranged at the inner upper end of the measuring body, a buffer shock absorbing assembly is symmetrically arranged inside the base, a universal arm is arranged at the upper end of the buffer shock absorbing assembly, an adjustment mounting assembly is arranged on the surface of the universal arm, a non-contact displacement sensor is arranged at one end of the adjustment mounting assembly, and a positioning bite assembly is arranged in the middle of the upper end of the base.

[0011] Further in the present invention; the adjustment and installation assembly includes an adjustment device, a mounting rod, an abutment plate, an intermediate plate, a connecting sleeve, a limit spring and a telescopic rod, wherein the surface of the universal arm is provided with an adjustment device, a mounting rod is provided on one side of the adjustment device, an intermediate plate is provided inside the mounting rod, the surface of the intermediate plate is symmetrically provided with telescopic rods, a limit spring is sleeved on the surface of the telescopic rod, an abutment plate is provided at one end of the telescopic rod, and a connecting sleeve is provided on one side of the non-contact displacement sensor corresponding to the abutment plate.

[0012] In the present invention, a limiting slot is further provided inside the abutting plate, and a protruding block is provided inside the connecting sleeve corresponding to the limiting slot.

[0013] Further in the present invention; the adjustment device includes a movable sleeve, a fastening bolt and a positioning hole, wherein the positioning holes are evenly spaced inside the universal arm, the movable sleeve is provided on the surface of the universal arm, and the fastening bolt is penetrated inside the movable sleeve.

[0014] Further in the present invention; the positioning bite assembly includes a tension spring, a tension sensor, a guide sleeve, a movable block and a bite device, wherein a guide sleeve is provided at the upper end of the base, a tension sensor is provided at the inner bottom end of the guide sleeve, a tension spring is provided at the upper end of the tension sensor, a movable block is provided at the upper end of the tension spring, and a bite device is provided at the upper end of the movable block.

[0015] In the present invention, further, a display screen is arranged on one side surface of the guide sleeve, and scale lines are arranged on the surface of the movable block.

[0016] Further in the present invention; the bite device includes a bite plate, a positioning groove and a bidirectional screw, wherein a bidirectional screw is arranged inside the upper end of the movable block, a bite plate is symmetrically arranged on the surface of the bidirectional screw, and positioning grooves are arranged on both sides of the upper end of the movable block.

[0017] Furthermore, in the present invention, the surface on one side opposite to the bite plate is provided with bite teeth, and a limiting slide groove is provided inside the movable block corresponding to the bite plate.

[0018] Further in the present invention; the buffer shock absorbing assembly includes a support seat, a positioning seat, a damping sleeve and a buffer spring, wherein the buffer springs are symmetrically arranged inside the base, damping sleeves are arranged on both sides of the buffer spring, a positioning seat is arranged at one end of the damping sleeve, and a support seat is arranged inside the positioning seat.

[0019] Further in the present invention; a measurement method of a high-precision non-contact displacement measuring device comprises the following steps:

[0020] Step 1: Place the test piece inside the positioning groove for preliminary positioning, then rotate the bidirectional screw to drive the two sets of bite plates to approach each other, and at the same time, the bite teeth can clamp the two sides of the test piece to ensure that the test piece is installed stably, and fix its upper end through the upper fixing frame;

[0021] Step 2: Insert the support base at the bottom of the universal arm into the positioning base for installation, and adjust the use height of the movable sleeve. Loosen the fastening bolts so that it no longer limits the movable sleeve. At the same time, slide the movable sleeve up and down along the universal arm to position it. After determining the use height, tighten the fastening bolts to re-fix it.

[0022] Step 3: Align the connecting sleeve on one side of the non-contact displacement sensor with the mounting rod, then press the abutment plate so that the limit spring is compressed and the abutment plate is retracted into the inside of the mounting rod, then the connecting sleeve is sleeved on the surface of the mounting rod and the abutment plate is loosened, and then the connecting sleeve is rotated to make the raised block inside it correspond to the limit slot inside the abutment plate. At this time, the limit spring is reset so that the abutment plate abuts against the inside of the connecting sleeve to limit it, thereby ensuring the convenience and stability of the installation of the non-contact displacement sensor;

[0023] Step 4: Use two sets of non-contact displacement sensors to measure and compare the data of the installed test piece. At the same time, a buffer spring is provided to buffer the support seat, and the elastic potential energy generated is processed by the damping sleeve to improve the shock absorption effect when the non-contact displacement sensor is used, and the measurement accuracy is further improved. In further measurement, the movable block can be pulled to stretch the tension spring at its bottom, and the tension sensor is subjected to force to measure the tension. Then, the deformation displacement of the test piece at this time is measured by the non-contact displacement sensor, and the tension value can be read through the display screen to improve the applicability of the equipment.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention can conveniently install the non-contact displacement sensor by setting an adjustable installation component, thereby improving the stability of equipment use and ensuring the quality of use. The installation steps are simple and convenient, saving human resources, and the equipment has a good use effect. The height adjustment of the non-contact displacement sensor is accurate and stable, reducing measurement errors.

[0026] 2. The present invention can stably install and fix the test piece by setting a positioning snap-in assembly to prevent it from loosening, thereby ensuring the quality of equipment use. It can also perform snap-in installation on test pieces of different specifications to improve the installation strength and ensure the stability of equipment operation.

[0027] 3. The present invention provides a buffer shock-absorbing component to reduce the vibration of the non-contact displacement sensor when it is in use, thereby preventing vibration from affecting the measurement, reducing measurement errors, improving data accuracy, and ensuring the use effect of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the adjustment and installation assembly of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the regulating device of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the positioning and snapping assembly of the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the bite device of the present invention;

[0033] Figure 6 It is a schematic diagram of the structure of the buffer shock absorbing component of the present invention.

[0034] In the figure: 1. Measuring body; 2. Universal arm; 3. Adjusting and installing assembly; 31. Adjusting device; 311. Movable sleeve; 312. Fastening bolt; 313. Positioning hole; 32. Mounting rod; 33. Abutment plate; 34. Intermediate plate; 35. Connecting sleeve; 36. Limit spring; 37. Telescopic rod; 4. Non-contact displacement sensor; 5. Buffering and shock absorbing assembly; 51. Support seat; 52. Positioning card seat; 53. Damping sleeve; 54. Buffer spring; 6. Base; 7. Positioning and engaging assembly; 71. Display screen; 72. Tension spring; 73. Tension sensor; 74. Guide sleeve; 75. Movable block; 76. Engaging device; 761. Engaging teeth; 762. Engaging plate; 763. Positioning groove; 764. Bidirectional screw; 8. Upper fixing frame. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] See also Figure 1-6 The present invention provides the following technical solutions: a high-precision non-contact displacement measuring device, comprising a measuring body 1, a base 6 is arranged at the inner bottom end of the measuring body 1, an upper fixing frame 8 is arranged at the inner upper end of the measuring body 1, a buffer shock absorbing component 5 is symmetrically arranged inside the base 6, a universal arm 2 is arranged at the upper end of the buffer shock absorbing component 5, an adjustment installation component 3 is arranged on the surface of the universal arm 2, a non-contact displacement sensor 4 is arranged at one end of the adjustment installation component 3, and a positioning bite component 7 is arranged in the middle of the upper end of the base 6.

[0038] Specifically, the adjustment and mounting assembly 3 includes an adjustment device 31, a mounting rod 32, an abutment plate 33, an intermediate plate 34, a connecting sleeve 35, a limit spring 36 and a telescopic rod 37, wherein the adjustment device 31 is provided on the surface of the universal arm 2, a mounting rod 32 is provided on one side of the adjustment device 31, an intermediate plate 34 is provided inside the mounting rod 32, telescopic rods 37 are symmetrically provided on the surface of the intermediate plate 34, a limit spring 36 is sleeved on the surface of the telescopic rod 37, an abutment plate 33 is provided at one end of the telescopic rod 37, and a connecting sleeve 35 is provided on one side of the non-contact displacement sensor 4 corresponding to the abutment plate 33.

[0039] By adopting the above technical solution, the connecting sleeve 35 on one side of the non-contact displacement sensor 4 is matched with the mounting rod 32, and then the abutment plate 33 is pressed so that the limit spring 36 is compressed to retract the abutment plate 33 into the interior of the mounting rod 32, and then the connecting sleeve 35 is sleeved on the surface of the mounting rod 32 and the abutment plate 33 is loosened, and then the connecting sleeve 35 is rotated to make the raised block inside it correspond to the limit slot inside the abutment plate 33, at this time, the limit spring 36 is reset so that the abutment plate 33 abuts against the inside of the connecting sleeve 35 to limit it, thereby ensuring the convenience and stability of the installation of the non-contact displacement sensor 4.

[0040] Specifically, a limiting slot is provided inside the abutting plate 33 , and a protruding block is provided inside the connecting sleeve 35 corresponding to the limiting slot.

[0041] By adopting the above technical solution, the stability and firmness of the installation of the connecting sleeve 35 are improved, and the use quality of the equipment is guaranteed.

[0042] Specifically, the adjustment device 31 includes a movable sleeve 311, a fastening bolt 312 and a positioning hole 313, wherein the positioning holes 313 are evenly spaced inside the universal arm 2, the movable sleeve 311 is provided on the surface of the universal arm 2, and the fastening bolt 312 is penetrated inside the movable sleeve 311.

[0043] By adopting the above technical solution, the support base 51 at the bottom end of the universal arm 2 is inserted into the positioning base 52 for installation, and the use height of the movable sleeve 311 is adjusted, the fastening bolts 312 are loosened so that it no longer limits the movable sleeve 311, and the movable sleeve 311 is slid up and down along the universal arm 2 to position it, and after the use height is determined, the fastening bolts 312 are tightened to re-fix it.

[0044] When using this embodiment: insert the support seat 51 at the bottom end of the universal arm 2 into the positioning seat 52 for installation, adjust the use height of the movable sleeve 311, loosen the fastening bolts 312 so that it no longer limits the movable sleeve 311, and slide the movable sleeve 311 up and down along the universal arm 2 to position it, and tighten the fastening bolts 312 to re-fix it after determining the use height;

[0045] The connecting sleeve 35 on one side of the non-contact displacement sensor 4 is aligned with the mounting rod 32, and then the abutment plate 33 is pressed so that the limit spring 36 is compressed to retract the abutment plate 33 into the interior of the mounting rod 32. The connecting sleeve 35 is then sleeved on the surface of the mounting rod 32 and the abutment plate 33 is loosened. The connecting sleeve 35 is then rotated to make the raised block inside it correspond to the limit slot inside the abutment plate 33. At this time, the limit spring 36 is reset so that the abutment plate 33 abuts against the inside of the connecting sleeve 35 to limit it, thereby ensuring the convenience and stability of the installation of the non-contact displacement sensor 4.

[0046] Example 2

[0047] The present embodiment is different from the embodiment 1 in that: specifically, the positioning bite assembly 7 includes a tension spring 72, a tension sensor 73, a guide sleeve 74, a movable block 75 and a bite device 76, wherein a guide sleeve 74 is provided at the upper end of the base 6, a tension sensor 73 is provided at the inner bottom end of the guide sleeve 74, a tension spring 72 is provided at the upper end of the tension sensor 73, a movable block 75 is provided at the upper end of the tension spring 72, and a bite device 76 is provided at the upper end of the movable block 75.

[0048] By adopting the above technical solution, during further measurement, the movable block 75 can be pulled to stretch the tension spring 72 at its bottom, and at the same time, the tension sensor 73 is subjected to force to measure the tension, and then the deformation displacement of the test piece at this time is measured by the non-contact displacement sensor 4, and the tension value can be read out through the display screen 71, thereby improving the applicability of the equipment.

[0049] Specifically, a display screen 71 is provided on one side surface of the guide sleeve 74 , and scale lines are provided on the surface of the movable block 75 .

[0050] By adopting the above technical solution, the value of the tension sensor 73 can be read in real time, and the displacement of the movable block 75 can be manually read.

[0051] Specifically, the bite device 76 includes a bite plate 762, a positioning groove 763 and a bidirectional screw 764, wherein a bidirectional screw 764 is arranged inside the upper end of the movable block 75, the bite plate 762 is symmetrically arranged on the surface of the bidirectional screw 764, and positioning grooves 763 are arranged on both sides of the upper end of the movable block 75.

[0052] By adopting the above technical solution, the test piece is placed inside the positioning groove 763 for preliminary positioning, and then the bidirectional screw 764 is rotated to drive the two sets of bite plates 762 to approach each other. At the same time, the bite teeth 761 can clamp the two sides of the test piece to ensure that the test piece is installed stably, and its upper end is fixed by the upper fixing frame 8.

[0053] Specifically, a bite tooth 761 is provided on a surface of one side opposite to the bite plate 762 , and a limit sliding groove is provided inside the movable block 75 corresponding to the bite plate 762 .

[0054] By adopting the above technical solution, the bite strength of the bite plate 762 on the test piece is improved, the stability of the installation is guaranteed, and the use quality of the equipment is improved.

[0055] When this embodiment is used: the test piece is placed in the positioning groove 763 for preliminary positioning, and then the two-way screw rod 764 is rotated to drive the two sets of bite plates 762 to approach each other, and at the same time, the bite teeth 761 can clamp the two sides of the test piece to ensure that the test piece is installed stably, and the upper end of the test piece is fixed by the upper fixing frame 8;

[0056] During further measurement, the movable block 75 can be pulled to stretch the tension spring 72 at its bottom, and at the same time, the tension sensor 73 is subjected to force to measure the tension, and then the deformation displacement of the test piece is measured by the non-contact displacement sensor 4, and the tension value can be read out through the display screen 71, thereby improving the applicability of the equipment.

[0057] Example 3

[0058] The difference between this embodiment and Embodiment 1 and Embodiment 2 is that: specifically, the buffer shock absorbing assembly 5 includes a support seat 51, a positioning seat 52, a damping sleeve 53 and a buffer spring 54, wherein the buffer springs 54 are symmetrically arranged inside the base 6, the damping sleeves 53 are arranged on both sides of the buffer spring 54, the positioning seat 52 is arranged at one end of the damping sleeve 53, and the support seat 51 is arranged inside the positioning seat 52.

[0059] When this embodiment is in use, a buffer spring 54 is provided to buffer the support seat 51, and the generated elastic potential energy is processed by the damping sleeve 53, so as to improve the shock absorption effect of the non-contact displacement sensor 4 when in use and further improve the measurement accuracy.

[0060] The tension sensor 73 in the present invention is an existing disclosed technology, and the selected model is SQ-5312.

[0061] The structures and use principles of the measuring body 1, the universal arm 2 and the non-contact displacement sensor 4 in the present invention have been disclosed in the non-contact separation continuous displacement measuring device for a universal material testing machine disclosed in Chinese patent application No. 201821592744.7.

[0062] Working principle and use process of the present invention: When the present invention is used, the test piece is placed inside the positioning groove 763 for preliminary positioning, and then the two-way screw rod 764 is rotated to drive the two sets of bite plates 762 to approach each other, and at the same time, the bite teeth 761 can clamp the two sides of the test piece to ensure that the test piece is installed stably, and the upper end of the test piece is fixed by the upper fixing frame 8;

[0063] Insert the support base 51 at the bottom of the universal arm 2 into the positioning base 52 for installation, and adjust the use height of the movable sleeve 311, loosen the fastening bolts 312 so that it no longer limits the movable sleeve 311, and slide the movable sleeve 311 up and down along the universal arm 2 to position it, and tighten the fastening bolts 312 to re-fix it after determining the use height;

[0064] The connecting sleeve 35 on one side of the non-contact displacement sensor 4 is aligned with the mounting rod 32, and then the abutment plate 33 is pressed so that the limiting spring 36 is compressed to receive the abutment plate 33 into the interior of the mounting rod 32, and then the connecting sleeve 35 is sleeved on the surface of the mounting rod 32 and the abutment plate 33 is loosened, and then the connecting sleeve 35 is rotated to make the raised block inside the connecting sleeve correspond to the limiting slot inside the abutment plate 33, at this time, the limiting spring 36 is reset so that the abutment plate 33 abuts against the interior of the connecting sleeve 35 to limit it, thereby ensuring the convenience and stability of the installation of the non-contact displacement sensor 4;

[0065] Two groups of non-contact displacement sensors 4 are used to measure and compare the data of the installed test piece. At the same time, a buffer spring 54 is provided to buffer the support seat 51, and the elastic potential energy generated is processed by the damping sleeve 53 to improve the shock absorption effect of the non-contact displacement sensor 4 when in use, and further improve the measurement accuracy. During further measurement, the movable block 75 can be pulled to stretch the tension spring 72 at its bottom, and at the same time, the tension sensor 73 is subjected to force to measure the tension. Then, the deformation displacement of the test piece at this time is measured by the non-contact displacement sensor 4, and the tension value can be read through the display screen 71, thereby improving the applicability of the equipment.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision non-contact displacement measuring device, comprising a measuring body (1), wherein a base (6) is provided at the bottom end of the measuring body (1), and an upper fixing frame (8) is provided at the upper end of the measuring body (1), wherein: A buffer shock absorbing assembly (5) is symmetrically arranged inside the base (6); a universal arm (2) is arranged at the upper end of the buffer shock absorbing assembly (5); an adjustment mounting assembly (3) is arranged on the surface of the universal arm (2); a non-contact displacement sensor (4) is arranged at one end of the adjustment mounting assembly (3); and a positioning engaging assembly (7) is arranged in the middle of the upper end of the base (6).

2. A high-precision non-contact displacement measuring device according to claim 1, characterized in that: The adjustment and installation assembly (3) comprises an adjustment device (31), a mounting rod (32), an abutment plate (33), an intermediate plate (34), a connection sleeve (35), a limit spring (36) and a telescopic rod (37), wherein the adjustment device (31) is arranged on the surface of the universal arm (2), a mounting rod (32) is arranged on one side of the adjustment device (31), an intermediate plate (34) is arranged inside the mounting rod (32), telescopic rods (37) are symmetrically arranged on the surface of the intermediate plate (34), a limit spring (36) is sleeved on the surface of the telescopic rod (37), an abutment plate (33) is arranged on one end of the telescopic rod (37), and a connection sleeve (35) is arranged on one side of the non-contact displacement sensor (4) corresponding to the abutment plate (33).

3. A high-precision non-contact displacement measuring device according to claim 2, characterized in that: A limiting slot is provided inside the abutting plate (33), and a protruding block is provided inside the connecting sleeve (35) corresponding to the limiting slot.

4. A high-precision non-contact displacement measuring device according to claim 2, characterized in that: The adjustment device (31) comprises a movable sleeve (311), a fastening bolt (312) and a positioning hole (313), wherein the positioning holes (313) are evenly spaced inside the universal arm (2), the movable sleeve (311) is provided on the surface of the universal arm (2), and the fastening bolt (312) is penetrated inside the movable sleeve (311).

5. The high-precision non-contact displacement measuring device according to claim 1, characterized in that: The positioning and engaging assembly (7) comprises a tension spring (72), a tension sensor (73), a guide sleeve (74), a movable block (75) and an engaging device (76), wherein the upper end of the base (6) is provided with a guide sleeve (74), the inner bottom end of the guide sleeve (74) is provided with a tension sensor (73), the upper end of the tension sensor (73) is provided with a tension spring (72), the upper end of the tension spring (72) is provided with a movable block (75), and the upper end of the movable block (75) is provided with an engaging device (76).

6. A high-precision non-contact displacement measuring device according to claim 5, characterized in that: A display screen (71) is provided on one side surface of the guide sleeve (74), and scale lines are provided on the surface of the movable block (75).

7. A high-precision non-contact displacement measuring device according to claim 5, characterized in that: The bite device (76) comprises a bite plate (762), a positioning groove (763) and a bidirectional screw rod (764), wherein a bidirectional screw rod (764) is arranged inside the upper end of the movable block (75), a bite plate (762) is symmetrically arranged on the surface of the bidirectional screw rod (764), and positioning grooves (763) are arranged on both sides of the upper end of the movable block (75).

8. A high-precision non-contact displacement measuring device according to claim 7, characterized in that: The surface of one side opposite to the bite plate (762) is provided with bite teeth (761), and the interior of the movable block (75) is provided with a limit sliding groove corresponding to the bite plate (762).

9. The high-precision non-contact displacement measuring device according to claim 1, characterized in that: The buffer shock absorbing component (5) comprises a support seat (51), a positioning seat (52), a damping sleeve (53) and a buffer spring (54), wherein the buffer spring (54) is symmetrically arranged inside the base (6), the damping sleeve (53) is arranged on both sides of the buffer spring (54), the positioning seat (52) is arranged at one end of the damping sleeve (53), and the support seat (51) is arranged inside the positioning seat (52).

10. A measurement method of a high-precision non-contact displacement measuring device according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: Place the test piece in the positioning groove (763) for preliminary positioning, then rotate the bidirectional screw (764) to drive the two sets of bite plates (762) to move closer to each other, and at the same time, the bite teeth (761) can clamp the two sides of the test piece to ensure that the test piece is installed stably, and fix its upper end through the upper fixing frame (8); Step 2: Insert the support seat (51) at the bottom end of the universal arm (2) into the positioning seat (52) for installation, and adjust the use height of the movable sleeve (311), loosen the fastening bolts (312) so that it no longer limits the movable sleeve (311), and slide the movable sleeve (311) up and down along the universal arm (2) to position it, and tighten the fastening bolts (312) to re-fix it after determining the use height; Step 3: Align the connecting sleeve (35) on one side of the non-contact displacement sensor (4) with the mounting rod (32), then press the abutment plate (33) so that the limit spring (36) is compressed and the abutment plate (33) is received inside the mounting rod (32), then the connecting sleeve (35) is sleeved on the surface of the mounting rod (32) and the abutment plate (33) is loosened, and then the connecting sleeve (35) is rotated so that the raised block inside the connecting sleeve corresponds to the limit slot inside the abutment plate (33), at which time the limit spring (36) is reset so that the abutment plate (33) abuts against the inside of the connecting sleeve (35) to limit it, thereby ensuring the convenience and stability of the installation of the non-contact displacement sensor (4); Step 4: The installed test piece is measured and data is compared by using two groups of non-contact displacement sensors (4). At the same time, a buffer spring (54) is provided to buffer the support seat (51), and the generated elastic potential energy is processed by the damping sleeve (53), so as to improve the shock absorption effect of the non-contact displacement sensor (4) when in use, and further improve the measurement accuracy. When further measuring, the movable block (75) can be pulled to stretch the tension spring (72) at its bottom, and at the same time, the tension sensor (73) is subjected to force to measure the tension. Then, the deformation displacement of the test piece at this time is measured by the non-contact displacement sensor (4), and the tension value can be read out through the display screen (71), so as to improve the applicability of the device.

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