Telescopic probe mechanism of front bumper testing fixture

By designing height adjustment and angle adjustment components, combined with servo motors and angle sensors, precise angle and height adjustment of the front bumper inspection tool probe mechanism was achieved, solving the problem of inconvenient angle adjustment in existing technologies and improving inspection efficiency and accuracy.

CN223796009UActive Publication Date: 2026-01-13CHENGDU DOMORE AUTOMOBILE ENG CO LTD
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Patent Information

Application Number
CN202520520316.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-24
Publication Date
2026-01-13
Estimated Expiration
2035-03-24

AI Technical Summary

Technical Problem

The existing probe mechanism is not easy to adjust precisely when adjusting the angle, and it is difficult to maintain a specific angle with the front bumper surface, which reduces the detection efficiency.

Method used

A retractable probe mechanism for a front bumper inspection tool was designed, comprising a height adjustment component, an angle adjustment component, and a probe component. A servo motor drives the rotating shaft to rotate, and combined with an angle sensor and angle scale lines, the probe component can be precisely adjusted in angle. It can also adapt to different height requirements through a magnetic base and a hydraulic rod.

Benefits of technology

It enables precise angle and height adjustment of the probe assembly, improving measurement accuracy and efficiency, allowing operators to intuitively control the angle of the probe assembly, and adapting to complex-shaped front bumper surfaces.

✦ Generated by Eureka AI based on patent content.

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    Figure CN223796009U_ABST
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Abstract

The utility model discloses a telescopic probe mechanism of a front bumper testing fixture, and belongs to the technical field of front bumper testing fixtures. The telescopic probe mechanism of the front bumper testing fixture comprises a height adjusting assembly, an angle adjusting assembly and a probe assembly, the angle adjusting assembly is arranged below the height adjusting assembly, the probe assembly is arranged below the angle adjusting assembly, the height adjusting assembly is used for adjusting the height of the probe assembly, and the angle adjusting assembly is used for adjusting the angle of the probe assembly. The probe assembly is used for being matched with detection equipment to measure the front bumper, the angle adjusting assembly comprises a connecting base, a rotating shaft is rotationally connected into the connecting base, an adjusting base is installed outside the rotating shaft, a servo motor is installed on one side of the outer wall of the connecting base, and an angle sensor is installed at the output end of the servo motor. The output end of the servo motor is in transmission connection with the rotating shaft, the probe assembly comprises a first butt joint seat, and the top end of the first butt joint seat is fixedly connected with the bottom end of the adjusting seat.
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Description

Technical Field

[0001] This utility model relates to the field of front bumper inspection tool technology, specifically a retractable probe mechanism for a front bumper inspection tool. Background Technology

[0002] The front bumper is a safety device at the front of a car, its main function being to absorb and mitigate external impacts, protecting the vehicle and its occupants. It not only has a decorative function but also acts as a buffer in the event of a collision, reducing damage to the vehicle and passengers. A front bumper inspection tool is a specially designed tool used to inspect and ensure the quality of a car's front bumper. Its main functions include dimensional inspection, checking of positioning holes and bolt holes, surface quality inspection, and matching tests, ensuring that the front bumper meets the manufacturer's design requirements and can be correctly installed and used. The probe structure of the front bumper inspection tool is generally telescopic. The telescopic probe can be adjusted according to the specific contour and surface undulations of the bumper, ensuring that the probe remains perpendicular and in close contact with the bumper surface, thereby accurately measuring the dimensional and positional parameters of different parts.

[0003] Based on the above, the inventors have discovered the following problems: the current probe mechanism is not convenient for angle adjustment in actual use, and it is difficult to accurately obtain the adjusted angle. The front bumper has a complex shape, and if the probe mechanism is not convenient for angle adjustment, it is difficult to maintain a specific angle with the surface of the part being measured, which reduces the detection efficiency.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a retractable probe mechanism for a front bumper inspection tool, in order to achieve a more practical purpose. Utility Model Content

[0005] The purpose of this invention is to provide a retractable probe mechanism for a front bumper inspection tool to solve the problems mentioned in the background art.

[0006] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0007] A retractable probe mechanism for a front bumper inspection tool includes a height adjustment component, an angle adjustment component, and a probe component. The angle adjustment component is located below the height adjustment component, and the probe component is located below the angle adjustment component. The height adjustment component is used to adjust the height of the probe component, and the angle adjustment component is used to adjust the angle of the probe component. The probe component is used to cooperate with an inspection device to measure the front bumper. The angle adjustment component includes a connecting seat, a rotating shaft is rotatably connected inside the connecting seat, and an adjustment seat is installed outside the rotating shaft. A servo motor is installed on one side of the outer wall of the connecting seat, and an angle sensor is installed at the output end of the servo motor. The output end of the servo motor is connected to the rotating shaft via a transmission connection. The probe component includes a first docking seat, the top end of which is fixedly connected to the bottom end of the adjustment seat.

[0008] Furthermore, the connecting seat has a circular groove on the side away from the servo motor, and the inside of the circular groove has angle scale lines. The rotating shaft extends through the connecting seat into the circular groove at the end away from the servo motor, and a pointer is installed on the top surface of the rotating shaft at the end away from the servo motor.

[0009] The beneficial effect of adopting the above-mentioned further solution is that by setting angle scale lines and pointers, the rotation angle of the shaft can be displayed intuitively, and the adjustment angle of the probe assembly can be clearly known. This makes the angle adjustment visual, which makes it convenient for operators to accurately control the angle of the probe assembly and improves the accuracy and efficiency of measurement.

[0010] Furthermore, the first docking seat has a second docking seat at the end away from the adjusting seat. The outer wall of one end of the first docking seat is clearance-fitted with the inner wall of one end of the second docking seat. A square cylinder is installed at the bottom of the second docking seat. Sliding grooves are provided on all four sides of the inner wall of the square cylinder. A square plate is slidably connected between the four sliding grooves. A spring is connected to the top surface of the square plate. The spring is fixedly connected to the top of the inside of the square cylinder at the end away from the square plate. A round hole is provided at the bottom of the square cylinder. A probe head is slidably provided inside the round hole. The top of the probe head is fixedly connected to the bottom of the square plate.

[0011] The beneficial effect of adopting the above-mentioned further solution is that, through the combined use of the square tube, square plate, spring and probe head, the probe head has a certain range of motion and can adapt to the front bumper surface of different shapes. When the probe head contacts the front bumper for measurement, the front bumper surface is curved. When the probe head contacts the curved surface, the square plate slides in the groove and compresses the spring. The elasticity of the spring can make the probe head fit the front bumper surface better.

[0012] Furthermore, grooves are provided on both sides of the inner wall of the second docking seat, and through holes are provided on both sides of the outer wall of the first docking seat. Protrusions are slidably provided inside the two through holes. The outer wall of the protrusion is slidably engaged with the inner wall of the through hole, and one end of the protrusion extends into the interior of the groove. The outer wall of one end of the protrusion is clearance engaged with the inner wall of the groove.

[0013] Furthermore, the inner wall of the first docking seat is provided with a cavity, and a bidirectional screw is rotatably connected inside the cavity. The outer side of the bidirectional screw is threaded with a slide block at a pair of opposite threads. A smooth rod is provided on both sides of the bidirectional screw between the pair of slide blocks. The two ends of the smooth rod extend through the pair of slide blocks to the outside and are fixedly connected to the inner wall of the cavity. The outer wall of the smooth rod slides in contact with the through hole of the slide block. A connecting rod is rotatably connected to both sides of the outer side of the pair of slide blocks. A connecting block is rotatably connected to the end of the connecting rod away from the slide block. The connecting block is fixedly connected to the side of the protrusion away from the groove at the end away from the connecting rod.

[0014] The beneficial effect of adopting the above-mentioned further solution is that, by setting a bidirectional screw, when the bidirectional screw rotates, due to the action of a pair of opposite threads, the two slides will move in opposite directions under the restriction of the light rod, and the connecting rod drives the connecting block and the protrusion to move, thereby realizing the extension and retraction of the protrusion, which facilitates the control of the connection and separation of the first docking seat and the second docking seat. When the first docking seat and the second docking seat are separated, the first docking seat and the second docking seat can be disassembled, which facilitates the subsequent replacement of the worn probe head.

[0015] Furthermore, one end of the screw extends through the first mating seat, and an internal hexagonal groove is provided inside the one end of the screw, which matches an internal hexagonal wrench.

[0016] The advantage of adopting the above-mentioned further solution is that, by matching the internal hex wrench with the internal hex socket, the operator can use the internal hex wrench to turn the double-ended screw.

[0017] Furthermore, the height adjustment component includes a magnetic base, a round rod is installed at the bottom end of the magnetic base, a telescopic rod is provided inside the round rod, and a square hole is opened inside the round rod. The inner wall of the square hole slides in fit with the outer wall of the telescopic rod near the upper end. The bottom end of the telescopic rod passes through the round rod and is fixedly connected to the top end of the connecting seat. A hydraulic rod is installed at the top end inside the round rod, and the movable end of the hydraulic rod is fixedly connected to the top end of the telescopic rod.

[0018] The beneficial effects of adopting the above-mentioned further solution are that, by setting a magnetic base, the probe mechanism can be installed on the inspection equipment of the fixture, improving the convenience of installation; by setting a hydraulic rod, the height of the probe assembly can be adjusted by extending and retracting the movable end of the telescopic rod, meeting the measurement needs of front bumpers of different heights, such as measuring the depth of the threaded hole in the front bumper.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: The retractable probe mechanism of the front bumper gauge drives the rotating shaft to rotate via a servo motor, which in turn drives the adjustment seat and the probe assembly connected to the adjustment seat to rotate. This enables precise adjustment of the probe assembly angle to meet the measurement needs of different angles. At the same time, an angle sensor is installed at the output end of the servo motor. The angle sensor can monitor the rotation angle of the rotating shaft in real time, thereby determining the specific rotation angle of the probe assembly. The angle sensor, servo motor and control panel are electrically connected via wires. The angle sensor transmits the angle information to the control panel, and the control panel then controls the servo motor to shut down, achieving precise control of the measured angle. By setting angle scale lines and pointers, the rotation angle of the rotating shaft can be displayed intuitively, thus clearly indicating the adjustment angle of the probe assembly, making the angle adjustment visual. Attached Figure Description

[0020] Figure 1 A three-dimensional structural diagram of a retractable probe mechanism for a front bumper inspection tool provided by this utility model;

[0021] Figure 2 A three-dimensional structural schematic diagram of the angle adjustment component of the retractable probe mechanism for a front bumper inspection tool provided by this utility model;

[0022] Figure 3 An exploded three-dimensional structural diagram of the probe assembly of a retractable probe mechanism for a front bumper inspection tool provided by this utility model;

[0023] Figure 4 A top cross-sectional view of the first docking seat of a retractable probe mechanism for a front bumper inspection tool provided by this utility model.

[0024] Figure 5 A front cross-sectional view of the circular rod of a retractable probe mechanism for a front bumper inspection tool provided by this utility model.

[0025] In the diagram: 1. Height adjustment component; 11. Magnetic base; 12. Round rod; 13. Hydraulic rod; 14. Telescopic rod; 2. Angle adjustment component; 21. Connecting seat; 22. Rotating shaft; 23. Adjusting seat; 24. Pointer; 25. Servo motor; 3. Probe component; 31. First docking seat; 32. Second docking seat; 33. Square cylinder; 34. Slide groove; 35. Square plate; 36. Spring; 37. Probe head; 38. Groove; 39. Protrusion; 310. Bidirectional screw; 311. Slide seat; 312. Connecting rod; 313. Connecting block; 314. Smooth rod; 315. Internal hexagonal slot. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-5This utility model provides a technical solution: a retractable probe mechanism for a front bumper inspection tool, including a height adjustment component 1, an angle adjustment component 2, and a probe component 3. The angle adjustment component 2 is located below the height adjustment component 1, and the probe component 3 is located below the angle adjustment component 2. The height adjustment component 1 is used to adjust the height of the probe component 3, and the angle adjustment component 2 is used to adjust the angle of the probe component 3. The probe component 3 is used to cooperate with the inspection equipment to measure the front bumper. The angle adjustment component 2 includes a connecting seat 21, with a rotating shaft 22 rotatably connected inside the connecting seat 21. An adjustment seat 23 is installed outside the rotating shaft 22. A servo motor 25 is installed on one side of the outer wall of the connecting seat 21, and an angle sensor is installed at the output end of the servo motor 25. The output end of the servo motor 25 is connected to the rotating shaft 22 via a transmission connection. The probe component 3 includes a first docking seat 31, with the top end of the first docking seat 31 fixedly connected to the bottom end of the adjustment seat 23. A circular groove is formed on the side of the connecting seat 21 away from the servo motor 25, and an angle scale line is provided inside the circular groove. The rotating shaft 22 extends through the connecting seat 21 into the circular groove at the end away from the servo motor 25. A pointer 24 is installed on the top surface of the end of the rotating shaft 22 away from the servo motor 25. The rotating shaft 22 is driven to rotate by the servo motor 25, which in turn drives the adjusting seat 23 and the probe assembly 3 connected to the adjusting seat 23 to rotate. This enables precise adjustment of the angle of the probe assembly 3, meeting the measurement needs of different angles. At the same time, an angle sensor is installed at the output end of the servo motor 25. The angle sensor can monitor the rotation angle of the rotating shaft 22 in real time, thereby knowing the specific rotation angle of the probe assembly 3. The angle sensor, servo motor 25 and control panel are electrically connected by wires. The angle sensor transmits the angle information to the control panel, and the control panel controls the servo motor 25 to turn off, realizing precise control of the measurement angle. By setting the angle scale line and the pointer 24, the rotation angle of the rotating shaft 22 can be displayed intuitively, and the adjustment angle of the probe assembly 3 can be clearly known, making the angle adjustment visual.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-5This utility model provides a technical solution: a first docking seat 31 has a second docking seat 32 at the end away from the adjusting seat 23. The outer wall of one end of the first docking seat 31 and the inner wall of one end of the second docking seat 32 are clearance-fitted. A square cylinder 33 is installed at the bottom end of the second docking seat 32. Sliding grooves 34 are provided on all four sides of the inner wall of the square cylinder 33. A square plate 35 is slidably connected between the four sliding grooves 34. A spring 36 is connected to the top surface of the square plate 35. The spring 36 is fixedly connected to the top end of the inner wall of the square cylinder 33 at the end away from the square plate 35. A round hole is provided at the bottom end of the square cylinder 33. A probe head 37 is slidably provided inside the round hole. The top end of the probe head 37 is fixedly connected to the bottom end of the square plate 35. Grooves 38 are provided on both sides of the inner wall of the second docking seat 32. The first docking seat 31 has through holes on both sides of its outer wall. The two through holes are slidably provided with protrusions 39. The outer wall of the protrusions 39 slides with the inner wall of the through holes, and one end of the protrusions 39 extends into the interior of the groove 38. The outer wall of one end of the protrusions 39 is clearance-fitted with the inner wall of the groove 38. Through the combined use of the square cylinder 33, the square plate 35, the spring 36 and the probe head 37, the probe head 37 has a certain range of motion and can adapt to different shapes of front bumper surfaces. When the probe head 37 contacts the front bumper for measurement, the front bumper surface is curved. When the probe head 37 contacts the curved surface, the square plate 35 slides in the groove 34 and compresses the spring 36. The elasticity of the spring 36 can make the probe head 37 fit the front bumper surface better.

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1-5This utility model provides a technical solution: A cavity is formed in the inner wall of the first docking seat 31. A bidirectional screw 310 is rotatably connected inside the cavity. Slide seats 311 are threadedly connected to the outer sides of the bidirectional screw 310 at a pair of opposite threads. A smooth rod 314 is provided on both sides of the bidirectional screw 310 between the pair of slide seats 311. The two ends of the smooth rod 314 extend through the pair of slide seats 311 to the outside and are fixedly connected to the inner wall of the cavity. The outer wall of the smooth rod 314 slides in cooperation with the through hole of the slide seat 311. A connecting rod 31 is rotatably connected to both outer sides of the pair of slide seats 311. 2. A connecting block 313 is rotatably connected to the end of the connecting rod 312 away from the slide 311. The connecting block 313 is fixedly connected to the side of the protrusion 39 away from the groove 38 at the end away from the connecting rod 312. One end of the screw extends through the first mating seat 31, and an internal hexagonal groove 315 is provided inside the screw. The internal hexagonal groove 315 matches an internal hexagonal wrench. The height adjustment component 1 includes a magnetic base 11. A round rod 12 is installed at the bottom of the magnetic base 11. A telescopic rod 14 is provided inside the round rod 12, and a square hole is provided inside the round rod 12. The inner wall of the square hole is close to the outer wall of the telescopic rod 14 near the upper end. The telescopic rod 14 is slidably fitted with the wall. The bottom end of the telescopic rod 14 passes through the round rod 12, and the bottom end of the telescopic rod 14 is fixedly connected to the top end of the connecting seat 21. A hydraulic rod 13 is installed inside the top end of the round rod 12, and the movable end of the hydraulic rod 13 is fixedly connected to the top end of the telescopic rod 14. By matching the internal hex wrench and the internal hex socket 315, the operator can use the internal hex wrench to rotate the double-ended screw 310. When the double-ended screw 310 rotates, due to the action of a pair of opposite threads, the two slides 311 will move in opposite directions under the restriction of the smooth rod 314, which drives the connecting block 313 through the connecting rod 312. The probe 39 moves, thereby enabling the extension and retraction of the probe 39, which facilitates the connection and separation of the first docking seat 31 and the second docking seat 32. When the first docking seat 31 and the second docking seat 32 are separated, the first docking seat 31 and the second docking seat 32 are detachable, which facilitates the subsequent replacement of the worn probe head 37. By setting the magnetic suction seat 11, the probe mechanism can be installed on the inspection equipment of the inspection fixture, improving the ease of installation. By setting the hydraulic rod 13, the height of the probe assembly 3 is adjusted by the extension and retraction of the movable end of the telescopic rod 14, and the depth of the threaded hole in the front bumper is measured.

[0032] Specifically, the working principle of this retractable probe mechanism for front bumper inspection is as follows: During use, the angle of the probe assembly 3 is adjusted according to the different shapes and curvatures of the front bumper. The servo motor 25 drives the rotating shaft 22 to rotate, which in turn drives the adjusting seat 23 and the probe assembly 3 connected to the adjusting seat 23 to rotate. This allows for precise adjustment of the probe assembly 3's angle, meeting the measurement needs of different angles. Simultaneously, an angle sensor is installed at the output end of the servo motor 25. The angle sensor can monitor the rotation angle of the rotating shaft 22 in real time, thus determining the specific rotation angle of the probe assembly 3. The angle sensor, servo motor 25, and control panel are electrically connected via wires. The angle sensor transmits the angle information to the control panel. The control panel controls the servo motor 25 to shut down, achieving precise control of the measurement angle. By setting the angle scale and pointer 24, the rotation angle of the shaft 22 can be displayed intuitively, thus clearly indicating the adjustment angle of the probe assembly 3, making the angle adjustment visual. When the probe head 37 contacts the front bumper for measurement, the surface of the front bumper is curved. When the probe head 37 contacts the curved surface, the square plate 35 slides in the groove 34 and compresses the spring 36. The elasticity of the spring 36 allows the probe head 37 to better fit the surface of the front bumper. The height of the probe assembly 3 is adjusted by extending and retracting the movable end of the telescopic rod 14 to measure the depth inside the threaded hole of the front bumper.

Claims

1. A front bumper gauge retractable probe mechanism, characterized by, Including height adjusting assembly (1), angle adjusting assembly (2) and probe assembly (3), the angle adjusting assembly (2) is arranged below the height adjusting assembly (1), the probe assembly (3) is arranged below the angle adjusting assembly (2), the height adjusting assembly (1) is used to adjust the height of probe assembly (3), the angle adjusting assembly (2) is used to adjust the angle of probe assembly (3), and the probe assembly (3) is used to cooperate with detection equipment to measure front bumper, the angle adjusting assembly (2) includes connecting seat (21), the inside of connecting seat (21) is rotatably connected with shaft (22), the outside of shaft (22) is installed with adjusting seat (23), the outer wall of connecting seat (21) is installed with servo motor (25) on one side, the output end of servo motor (25) is installed with angle sensor, and the output end of servo motor (25) is transmission connection with shaft (22), and the probe assembly (3) includes first docking seat (31), and the top of first docking seat (31) is fixedly connected with the bottom of adjusting seat (23).

2. A front bumper testing apparatus telescoping probe mechanism according to claim 1, wherein, The connecting seat (21) is provided with a circular groove on the side away from the servo motor (25), the inside of the circular groove is provided with an angle scale line, the shaft (22) extends through the connecting seat (21) and into the circular groove at the end away from the servo motor (25), and the top surface of the end of the shaft (22) away from the servo motor (25) is provided with a pointer (24).

3. A front bumper testing apparatus telescoping probe mechanism according to claim 2, wherein, The first docking seat (31) is provided with a second docking seat (32) at the end away from the adjusting seat (23), the outer wall of one end of the first docking seat (31) is gap matched with the inner wall of one end of the second docking seat (32), the bottom of the second docking seat (32) is provided with a square cylinder (33), the inner wall of the square cylinder (33) is provided with a sliding groove (34) on each side, a square plate (35) is slidably connected between the four sliding grooves (34), the top of the square plate (35) is connected with a spring (36), the spring (36) is fixedly connected with the inside top of the square cylinder (33) at the end away from the square plate (35), the bottom of the square cylinder (33) is provided with a circular hole, the inside of the circular hole is slidably provided with a probe head (37), and the top of the probe head (37) is fixedly connected with the bottom of the square plate (35).

4. A front bumper testing apparatus telescoping probe mechanism according to claim 3, wherein, The inner wall of the second docking seat (32) is provided with a recess (38) on both sides, the outer wall of the first docking seat (31) is provided with a through hole on both sides, the inside of the two through holes is slidably provided with a protrusion (39), the outer wall of the protrusion (39) is slidably matched with the inner wall of the through hole, and the end of the protrusion (39) extends into the recess (38), and the end of the protrusion (39) is gap matched with the inner wall of the recess (38).

5. A front bumper testing apparatus telescoping probe mechanism as set forth in claim 4, wherein, The inner wall of the first docking seat (31) is provided with a cavity, the inside of the cavity is rotationally connected with a bidirectional screw rod (310), the outside of the bidirectional screw rod (310) is threadedly connected with a sliding seat (311) at a pair of opposite threads, a pair of the sliding seats (311) are provided with a light rod (314) at the two sides of the bidirectional screw rod (310), the two ends of the light rod (314) extend to the outside through a pair of the sliding seats (311) and are fixedly connected with the inner wall of the cavity, the outer wall of the light rod (314) is in sliding fit with the through hole of the sliding seat (311), a pair of the sliding seats (311) are rotationally connected with a connecting rod (312) at the two sides of the outside, the connecting rod (312) is rotationally connected with a connecting block (313) at the end away from the sliding seat (311), the connecting block (313) is fixedly connected with the convex block (39) away from the recess (38) at the end away from the connecting rod (312).

6. A front bumper testing apparatus telescoping probe mechanism according to claim 5, wherein, One end of the screw rod extends through the first docking seat (31), and a hexagonal socket (315) is formed in the inside of the end of the screw rod.

7. A front bumper testing apparatus telescoping probe mechanism according to claim 6, wherein, The height adjusting assembly (1) comprises a magnetic seat (11), a round rod (12) is installed at the bottom end of the magnetic seat (11), a telescopic rod (14) is arranged in the inside of the round rod (12), a square hole is formed in the inside of the round rod (12), the inner wall of the square hole is in sliding fit with the outer wall of the telescopic rod (14) close to the upper end, the bottom end of the telescopic rod (14) penetrates through the round rod (12), and the bottom end of the telescopic rod (14) is fixedly connected with the top end of a connecting seat (21), a hydraulic rod (13) is installed at the inside top end of the round rod (12), and the movable end of the hydraulic rod (13) is fixedly connected with the top end of the telescopic rod (14).