CN113932687B

CN113932687B - Drilling detection device

Info

Publication number: CN113932687B
Application number: CN202110998022.1A
Authority: CN
Inventors: 张海; 汪莉
Original assignee: Anhui Tiansipu Super Precision Mould Co ltd
Current assignee: Anhui Tiansipu Super Precision Mould Co ltd
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2024-05-28
Anticipated expiration: 2041-08-27
Also published as: CN113932687A

Abstract

The invention discloses a drilling detection device, in particular to the field of automobile part detection, which comprises a pressing plate, wherein an inserting column used for being inserted into a part drill hole is fixedly connected to the pressing plate, a through hole communicated with the inserting column is formed in the joint of the pressing plate and the pressing plate, a scale carving mechanism convenient for a user to watch is arranged on the pressing plate, a displacement mechanism used for measuring the drilling depth is connected to the pressing plate, the displacement mechanism is sleeved on the outer side of the inserting column, a rotating mechanism is arranged on the pressing plate, a limiting mechanism used for limiting the displacement mechanism is connected to the rotating mechanism, and an electromagnetic assembly used for driving the part is arranged in the inserting column. According to the invention, the diameter and depth of the drilled hole can be obtained by a worker through simple operation, so that the work of the worker is further facilitated, the work efficiency of the worker is indirectly improved, the operation steps of the worker are simplified, and the method has high practicability.

Description

Drilling detection device

Technical Field

The invention relates to the technical field of automobile part detection devices, in particular to a drilling detection device.

Background

The drilling is an operation of processing holes on a solid material by using a drill bit, wherein the starting part of the drilling is called an orifice, the side part of the drilling is called a hole wall, the bottom of the drilling is called a hole bottom, the diameter D of the drilling is called an aperture for short, the diameter of the orifice is called a hole bottom diameter, the distance H from the orifice to the hole bottom is called a drilling depth, which is called a hole depth for short, in practice, a certain section of the drilling is called a hole section in practice, in the practical production condition, the measurement of the drilling on an automobile part is a part of the detection of the automobile part, the existing detection method mostly uses a three-coordinate detector to detect the drilling on the automobile part, but the existing detection method needs a worker to place the automobile part on a workbench, then uses other parts to limit the automobile part, and then the worker continuously adjusts the position of a detection head of the three-coordinate detector, so that the automobile part can be detected, but the detection method is complicated and cannot adapt to the detection of a large number of times, thereby the work load of the detection worker is increased, and the work efficiency of the detection worker is indirectly lowered.

We therefore propose a borehole inspection apparatus to solve the above problems.

Disclosure of Invention

In order to overcome the defects in the prior art, the embodiment of the invention provides the drilling detection device, and the diameter and the depth of a drilling hole can be obtained through simple operation of a worker, so that the work of the worker is further facilitated, the work efficiency of the worker is indirectly improved, the operation steps of the worker are simplified, and the device has higher practicability, so that the problems in the background art are solved.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a drilling detection device, includes the press board, fixedly connected with is arranged in inserting the spliced pole in the spare part drilling on the press board, the spliced pole is equipped with the through-hole that is linked together with the junction of press board, be equipped with the metric mechanism that is convenient for the user to watch on the press board, be connected with the displacement mechanism that is used for measuring drilling degree of depth on the press board, displacement mechanism cup joints in the outside of spliced pole, be equipped with slewing mechanism on the press board, be connected with the stop gear who is used for spacing displacement mechanism on the slewing mechanism, be equipped with the electromagnetic component who is used for driving spare part in the spliced pole, electromagnetic component is connected with outside controller, be equipped with the measuring mechanism that can pass the spliced pole lateral wall in the spliced pole, measuring mechanism's one end extends to in the through-hole and is in metric mechanism's below.

Optionally, the volume mechanism of carving includes the installation cover of fixed connection on the press board, the installation cover is in the top of through-hole, threaded connection has transparent scale lid on the installation cover, fixedly connected with is convenient for the handle that the user held on the press board.

Optionally, be equipped with the internal thread on the inside wall of installation cover, be equipped with on the transparent scale cover with installation cover internal thread assorted external screw thread, transparent scale cover's material is the ya keli material, transparent scale cover's surface laminating has the scale size, the handle is the vertical state with the scale size on the transparent scale cover.

Optionally, the displacement mechanism includes the shrink spring of fixed connection on the push plate, the one end fixedly connected with of shrink spring cup joints the removal ring on the inserted bar, the last swing joint of removal ring has the contact cylinder of cup joint on the inserted bar, fixedly connected with spacing post on the removal ring, be equipped with the screw thread groove in the removal ring, fixedly connected with and remove on the contact cylinder screw thread section of thick bamboo of ring screw thread groove assorted screw thread section of thick bamboo, screw thread section of thick bamboo and the screw thread groove threaded connection on the removal ring.

Optionally, the slewing mechanism is including setting up the breach on pressing the board, fixedly connected with two bearings on the inside wall of breach, two be equipped with the bull stick between the bearing, the both ends of bull stick are connected with two bearings rotation respectively, fixedly connected with blocks the pole on the pressing the board.

Optionally, stop gear is including cup jointing the rotary drum on the bull stick, fixedly connected with spacing frame on the rotary drum is equipped with on the spacing frame with spacing post assorted rectangle opening, be equipped with a plurality of spacing holes on the lateral wall of spacing frame, one of them spacing hole internal thread is connected with spacing screw.

Optionally, one end of the spacing post extends to the rectangle opening on the spacing frame, be equipped with the screw thread in the spacing hole, and spacing screw and spacing hole threaded connection, the one end of spacing screw contacts with the lateral wall of spacing post, the shape of blocking the pole is the form of bending, and blocks the one end of pole and contacts with the lateral wall of spacing frame.

Optionally, the electromagnetic assembly comprises a first electromagnetic plate, an isolation plate and a second electromagnetic plate, wherein the first electromagnetic plate and the second electromagnetic plate are respectively positioned at two sides of the isolation plate, and the electromagnetic assembly is positioned at the middle position of the inner bottom of the inserted column.

Optionally, the measuring mechanism includes two measuring rods that set up in the inserted bar, two the one end of measuring rod passes the lateral wall of inserted bar and extends to its outside, two the equal fixedly connected with measuring head of one end of measuring rod, and two measuring heads are in the lateral wall inner chamber of inserted bar respectively, two the equal fixedly connected with marking rod of one end of measuring rod, and two marking rods are in the through-hole respectively, two the measuring is done respectively with inserted bar sliding connection, two equal fixedly connected with magnet on the measuring rod, two measuring rods are in one side of first electromagnetic plate and second electromagnetic plate respectively.

Optionally, two gag levers are fixedly connected to the inside wall of the plunger, two slide grooves are formed in the two gag levers, a slide block is slidably connected to the slide grooves, the slide block is fixedly connected to the side wall of the measuring rod, and the measuring rod is slidably connected to the two gag levers.

The invention has the technical effects and advantages that:

In this device, the staff can directly insert the spliced pole in the drilling of car spare part, then start electromagnetic assembly through the controller, just so can make first electromagnetic plate and second electromagnetic plate produce magnetic force, simultaneously under the assistance of magnet, can make the measuring stick remove thereupon, just so can make the measuring head contact with the lateral wall of drilling, further just can make the marking pole remove, simultaneously the staff just can obtain the interval between two marking poles under the assistance of transparent scale cover, just so can make the interval of drilling obtain, simultaneously when the spliced pole inserts in the drilling of spare part, the contact cylinder removes thereupon, simultaneously the staff can rotate spacing frame, so make spacing post insert in spacing frame, simultaneously rotatory spacing screw, just so can make spacing post obtain spacing, thereby just can make the position of mobile ring obtain spacing, because also have the scale size on the spliced pole, thereby just can make things convenient for the staff to know the degree of depth of drilling, in this device, staff just can obtain the diameter and the degree of depth of drilling, further convenient for the staff's diameter and degree of depth, the staff has improved the practicality that has further has improved the staff's of the indirect work, the step has been more convenient, the staff.

In this device, the staff can be according to actual conditions to rotatory transparent scale lid, under the assistance of installation cover, just can make transparent scale lid follow installation cover separate out, further make things convenient for the staff to change transparent scale cover, the staff can be according to the condition of actual spare part simultaneously, thereby change the contact section of thick bamboo of different contact surfaces, the staff only needs rotatory contact section of thick bamboo, just so can make contact section of thick bamboo dismantle from removing the ring, thereby can make the device adapt to different automobile spare part, further the practicality of device has been improved.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic diagram of a connection structure of an electromagnetic assembly according to the present invention.

Fig. 3 is a schematic side view of the present invention.

Fig. 4 is a schematic side view of the present invention.

Fig. 5 is a schematic top view of the present invention.

Fig. 6 is a partially exploded view of the present invention.

Fig. 7 is a schematic diagram of a side view connection structure of fig. 6.

Fig. 8 is a schematic diagram of a connection structure of a rotation mechanism, a limit mechanism and a measurement mechanism in the present invention.

Fig. 9 is a schematic bottom view of fig. 8.

FIG. 10 is a schematic view of the internal connection structure of the plug according to the present invention;

FIG. 11 is a schematic diagram of a connection structure of the measuring mechanism according to the present invention.

Description of the reference numerals

1. Pressing plate 2 and inserting column

3. Electromagnetic assembly 31, first electromagnetic plate

32. Isolation plate 33, second electromagnetic plate

4. Handle 5, mounting sleeve

6. Transparent scale cover 7, through hole

8. Contraction spring 9, moving ring

10. Contact cylinder 11 and limit column

12. Screw barrel 13, notch

14. Bearing 15, rotating rod

16. Rotary drum 17 and limiting frame

18. Limiting hole 19 and limiting screw

20. Measuring rod 21 and measuring head

22. Marking rod 23 and limiting rod

24. Chute 25 and slide block

26. Magnet 27, blocking rod

Detailed Description

The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

Referring to fig. 1-11, a borehole detection device includes a pressing plate 1, wherein, the material of the pressing plate 1 is plastic, the weight of the whole device is reduced, the whole device is lighter, thereby being convenient for a worker to carry the whole device, a plug post 2 for being inserted into a part borehole is fixedly connected to the pressing plate 1, wherein, the material of the plug post 2 is alloy material which is not affected by magnetic force, and the plug post 2 is limited to some through holes and cannot adapt to all the through holes during measurement, thus the whole device is used in a proper scene, a through hole 7 which is communicated is arranged at the joint of the plug post 2 and the pressing plate 1, wherein, the plug hole 7 can be communicated with the pressing plate 1 and the plug post 2, thereby enabling one end of a marking rod 22 to extend to the lower part of a transparent scale cover 6, and further facilitating the use of the device by the worker.

The utility model provides a be equipped with the volume mechanism of carving that makes things convenient for user to watch on the push plate 1, it includes the installation cover 5 of fixed connection on push plate 1 to carve volume mechanism, installation cover 5 is in the top of through-hole 7, wherein threaded connection has transparent scale lid 6 on the installation cover 5, fixedly connected with makes things convenient for the handle 4 that user held on the push plate 1, be equipped with the internal thread on the inside wall of installation cover 5, be equipped with the external screw thread with installation cover 5 internal thread assorted on the transparent scale lid 6, transparent scale lid 6's material is the acrylic material, transparent scale lid 6's surface laminating has the volume size of carving, wherein it is particularly noted that, inlay in the transparent scale lid 6 has the magnifying glass, thereby make things convenient for the staff to observe the position of marking pole 22, the volume size of carving on handle 4 and the transparent scale lid 6 is the vertical state, wherein cup joint rubber sleeve on the handle 4, thereby make things convenient for the staff to hold whole device, further make things convenient for the user to use this device, and the horizontal position of handle 4 does not influence the viewing of marking pole 22, thereby make things convenient for user to use this device.

In actual operation, the staff can rotate transparent scale lid 6 according to actual conditions, under the assistance of installation cover 5 and transparent scale lid 6, the staff can dismantle transparent scale lid 6 from installation cover 5, thereby make things convenient for the staff to change transparent scale lid 6, wherein the staff can observe the position of marking pole 22 according to transparent scale lid 6, and it is especially noted that the magnifying glass in the transparent scale lid 6 can more make things convenient for the staff to watch the position of marking pole 22, the staff can be made things convenient for the staff to know the position between marking pole 22 to the while volume sticker, thereby make things convenient for the staff to know the diameter of drilling, further make things convenient for the staff's work, the indirect work efficiency that has improved the staff.

The device comprises a pressing plate 1, a pressing plate 2, a moving ring 9, a displacement mechanism used for measuring drilling depth, and a limiting column 11, wherein the pressing plate 1 is fixedly connected with the pressing plate 1, the shrinking spring 8 can drive the moving ring 9 to move on the inserting column 2, the shrinking spring 8 can enable the moving ring 9 to reset, one end of the shrinking spring 8 is fixedly connected with the moving ring 9 sleeved on the inserting column 2, the moving ring 9 is movably connected with a contact cylinder 10 sleeved on the inserting column 2, the contact cylinder 10 can be replaced with contact cylinders with different end faces in actual use conditions, further devices can be used for measuring different drilling holes, the practicability of the device is indirectly improved, the limiting column 11 is fixedly connected to the moving ring 9, a thread groove is formed in the moving ring 9, a thread cylinder 12 matched with the thread groove on the moving ring 9 is fixedly connected to the contact cylinder 10, the thread cylinder 12 is in threaded connection with the thread groove on the moving ring 9, and the displacement mechanism is sleeved on the outer side of the inserting column 2.

In the actual operation process, when the staff inserts the inserted post 2 into the drilling, under the blocking of spare part, just can make contact tube 10 upwards remove, and it is noted again simultaneously, be equipped with the ration sticker on the inserted post 2, thereby make things convenient for the staff to know contact tube 10 travel distance, further just can know the degree of depth of drilling, wherein the staff can rotate contact tube 10 according to actual conditions, just so can make screw thread section of thick bamboo 12 and remove ring 9 phase separation, further make things convenient for the staff to change contact tube 10, just so can make contact tube 10 adapt to different spare part, thereby improve the practicality of device.

The pressing plate 1 is provided with a rotating mechanism, the rotating mechanism comprises a notch 13 arranged on the pressing plate 1, wherein the notch 13 is a rectangular opening, so that the bearing 14 is conveniently arranged in the notch 13, two bearings 14 are fixedly connected to the inner side wall of the notch 13, a rotating rod 15 is arranged between the two bearings 14, the rotating rod 15 rotates in the bearing 14, the rotating rod 15 needs manual rotation of workers, otherwise, the rotating rod 15 cannot rotate, the workers can conveniently store the limiting frame 17, the blocking rod 27 is bent, one end of the blocking rod 27 is contacted with the side wall of the limiting frame 17, the limiting frame 17 can be limited when the blocking rod 27 is contacted with the limiting frame 17, the two ends of the rotating rod 15 are respectively connected with the two bearings 14 in a rotating mode, the limiting mechanism is fixedly connected to the pressing plate 1 and comprises a limiting mechanism used for limiting the displacement mechanism, the rotating cylinder 16 is fixedly connected to the limiting frame 17, the limiting frame 17 is further conveniently provided with the limiting frame 11, the limiting screw is further conveniently arranged on the limiting frame 17, the limiting screw is conveniently connected to the limiting screw 11, the limiting screw is conveniently arranged in the limiting frame 17, the limiting screw is connected to the limiting screw 11, the limiting screw is connected to one end of the limiting frame 19, and the limiting screw is conveniently arranged in the limiting screw is in the limiting screw hole 19, and the limiting screw is connected to the limiting screw 18, and the limiting screw is connected to the limiting screw 11 in the limiting screw hole 19, and the limiting screw is connected to the limiting screw 11 through the limiting screw 11.

In the actual operation process, when the worker finishes measuring the depth of the drilling hole again, the worker can directly rotate the limiting frame 17, under the assistance of the rotary drum 16 and the rotary rod 15, the limiting frame 17 can be positioned on one side of the limiting column 11, so that one end of the limiting column 11 can be extended into the limiting frame 17, then the worker can rotate the limiting screw 19, the limiting screw 19 can be contacted with the limiting column 11 under the assistance of the limiting hole 18, and meanwhile, the blocking rod 27 can limit the limiting frame 17, so that the worker can conveniently limit the limiting column 11, when the limiting column 11 is limited, the movement of the contact cylinder 10 can be avoided, and therefore the worker can know the depth of the drilling hole according to the position of the contact cylinder 10, and the working efficiency of the worker is facilitated.

The electromagnetic assembly 3 for driving the parts is arranged in the inserting column 2, the electromagnetic assembly 3 is composed of a first electromagnetic plate 31, an isolation plate 32 and a second electromagnetic plate 33, wherein the isolation plate 32 is made of an anti-magnetic plate, so that the influence generated between the first electromagnetic plate 31 and the second electromagnetic plate 33 can be isolated, the first electromagnetic plate 31 and the second electromagnetic plate 33 are respectively positioned at two sides of the isolation plate 32, the electromagnetic assembly 3 is positioned at the middle position of the inner bottom of the inserting column 2, when the two magnets 26 are positioned at one side of the first electromagnetic plate 31 and one side of the second electromagnetic plate 33, the first electromagnetic plate 31 and the second electromagnetic plate 33 can be moved when the first electromagnetic plate 31 and the second electromagnetic plate 33 are started by an external controller, and the measuring rod 20 can be further moved, and the electromagnetic assembly 3 is connected with the external controller.

The measuring mechanism which can penetrate through the side wall of the inserting column 2 is arranged in the inserting column 2, the measuring mechanism comprises two measuring rods 20 which are arranged in the inserting column 2, wherein the measuring rods 20 are bent, the measuring rods 20 can further contact with the side wall of a drilled hole, so that the measuring rods 20 can be moved, the diameter of the drilled hole can be measured, one ends of the two measuring rods 20 penetrate through the side wall of the inserting column 2 and extend to the outer side of the inserting column, one ends of the two measuring rods 20 are fixedly connected with measuring heads 21, the two measuring heads 21 are respectively arranged in the inner cavities of the side wall of the inserting column 2, the measuring heads 21 and the measuring rods 20 are integrally formed, so that workers can conveniently know the positions of the measuring rods 21, one ends of the two measuring rods 21 are fixedly connected with marking rods 22, and two marking rods 22 are respectively arranged in the through holes 7, wherein the color of the marking rods 22 is red, so that a user can conveniently observe the positions of the marking rods 22, the diameter of a drilling hole is further conveniently known by the worker, two measuring shafts 20 are respectively and slidably connected with the inserting columns 2, two limiting rods 23 are fixedly connected to the inner side walls of the inserting columns 2, sliding grooves 24 are respectively arranged on the two limiting rods 23, sliding blocks 25 are respectively and slidably connected to the two sliding grooves 24, the two sliding blocks 25 are respectively and fixedly connected with the side walls of the measuring rods 20, the two measuring rods 20 are respectively and slidably connected with the two limiting rods 23, magnets 26 are respectively and fixedly connected to the two measuring rods 20, one ends of the measuring mechanisms extend into the through holes and are positioned below the scale carving mechanisms.

In the actual operation process, a worker can directly insert the inserting column 2 into the inserting hole, then the worker can start the electromagnetic assembly 3 through an external controller, so that the first electromagnetic plate 31 and the second electromagnetic plate 33 can work, the magnet 26 can be moved, the two measuring rods 20 can be further moved, the measuring head 21 can be further contacted with the side wall of the drilled hole, when the measuring rods 20 are moved, the marking rods 22 can be moved along with the measuring rods, the worker can conveniently know the positions of the marking rods 22 with the aid of the transparent dial 6, the sliding blocks 25 can be moved in the sliding grooves 24 when the measuring rods 20 are moved, the measuring rods 20 can be moved along with the electromagnetic assembly, the worker can conveniently know the diameters of the drilled holes according to the positions of the two marking rods 22, the worker can conveniently work, and the work efficiency of the worker is indirectly improved.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention. In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims

1. Drilling detection device, its characterized in that: the automatic drilling device comprises a pressing plate (1), wherein an inserting column (2) used for being inserted into a part drill hole is fixedly connected to the pressing plate (1), a through hole (7) communicated with the connecting part of the inserting column (2) and the pressing plate (1) is formed in the pressing plate (1), a measuring mechanism convenient for a user to watch is arranged on the pressing plate (1), a displacement mechanism used for measuring the depth of the drill hole is connected to the pressing plate (1), the displacement mechanism is sleeved on the outer side of the inserting column (2), a rotating mechanism is arranged on the pressing plate (1), a limiting mechanism used for limiting the displacement mechanism is connected to the rotating mechanism, an electromagnetic assembly (3) used for driving the part is arranged in the inserting column (2), a measuring mechanism capable of penetrating through the side wall of the inserting column (2) is arranged in the inserting column (2), and one end of the measuring mechanism extends into the through hole and is located below the measuring mechanism;

The displacement mechanism comprises a contraction spring (8) fixedly connected to the pressing plate (1), one end of the contraction spring (8) is fixedly connected with a movable ring (9) sleeved on the inserting column (2), a contact cylinder (10) sleeved on the inserting column (2) is movably connected to the movable ring (9), a limit column (11) is fixedly connected to the movable ring (9), a thread groove is formed in the movable ring (9), a thread cylinder (12) matched with the thread groove on the movable ring (9) is fixedly connected to the contact cylinder (10), and the thread cylinder (12) is in threaded connection with the thread groove on the movable ring (9).

2. A borehole inspection apparatus according to claim 1, wherein: the measuring mechanism comprises a mounting sleeve (5) fixedly connected to the pressing plate (1), the mounting sleeve (5) is located above the through hole (7), a transparent scale cover (6) is connected to the mounting sleeve (5) in a threaded mode, and a handle (4) convenient to hold by a user is fixedly connected to the pressing plate (1).

3. A borehole inspection apparatus according to claim 2, wherein: the utility model discloses a transparent scale cover, including installation cover (5), transparent scale cover (6), be equipped with the internal thread on the inside wall of installation cover (5), be equipped with on transparent scale cover (6) with installation cover (5) internal thread assorted external screw thread, the material of transparent scale cover (6) is the ya keli material, the laminating of surface of transparent scale cover (6) has the scale size, scale size on handle (4) and the transparent scale cover (6) is the vertical state.

4. A borehole inspection apparatus according to claim 1, wherein: the rotating mechanism comprises a notch (13) arranged on the pressing plate (1), two bearings (14) are fixedly connected to the inner side wall of the notch (13), a rotating rod (15) is arranged between the two bearings (14), two ends of the rotating rod (15) are respectively connected with the two bearings (14) in a rotating mode, and a blocking rod (27) is fixedly connected to the pressing plate (1).

5. The borehole inspection apparatus as set forth in claim 4 wherein: the limiting mechanism comprises a rotary drum (16) sleeved on a rotary rod (15), a limiting frame (17) is fixedly connected to the rotary drum (16), a rectangular opening matched with the limiting column (11) is formed in the limiting frame (17), a plurality of limiting holes (18) are formed in the side wall of the limiting frame (17), and one of the limiting holes (18) is internally threaded and is connected with a limiting screw (19).

6. The borehole inspection apparatus as set forth in claim 5 wherein: one end of the limiting column (11) extends into a rectangular opening on the limiting frame (17), threads are arranged in the limiting hole (18), a limiting screw (19) is in threaded connection with the limiting hole (18), one end of the limiting screw (19) is in contact with the side wall of the limiting column (11), the blocking rod (27) is in a bent shape, and one end of the blocking rod (27) is in contact with the side wall of the limiting frame (17).

7. A borehole inspection apparatus according to claim 1, wherein: the electromagnetic assembly (3) consists of a first electromagnetic plate (31), an isolation plate (32) and a second electromagnetic plate (33), wherein the first electromagnetic plate (31) and the second electromagnetic plate (33) are respectively positioned on two sides of the isolation plate (32), and the electromagnetic assembly (3) is positioned in the middle position of the inner bottom of the inserted column (2).

8. A borehole inspection apparatus according to claim 1, wherein: the measuring mechanism comprises two measuring rods (20) arranged in an inserting column (2), one ends of the two measuring rods (20) penetrate through the side wall of the inserting column (2) and extend to the outer side of the inserting column, one ends of the two measuring rods (20) are fixedly connected with measuring heads (21), the two measuring heads (21) are respectively located in the inner cavities of the side walls of the inserting column (2), one ends of the two measuring rods (21) are fixedly connected with marking rods (22), the two marking rods (22) are respectively located in through holes (7), the two measuring rods (20) are respectively connected with the inserting column (2) in a sliding mode, magnets (26) are fixedly connected to the two measuring rods (20), and the two measuring rods (20) are respectively located on one sides of a first electromagnetic plate (31) and a second electromagnetic plate (33).

9. The borehole inspection apparatus as set forth in claim 8 wherein: two gag levers (23) are fixedly connected to the inside wall of the inserted column (2), two sliding grooves (24) are formed in the two gag levers (23), sliding blocks (25) are slidably connected in the two sliding grooves (24), the two sliding blocks (25) are fixedly connected with the side wall of the measuring rod (20) respectively, and the two measuring rods (20) are slidably connected with the two gag levers (23) respectively.