CN210803086U

CN210803086U - Impact-resistant puncture tester for safety helmet

Info

Publication number: CN210803086U
Application number: CN201921174410.2U
Authority: CN
Inventors: 陈波; 宗建; 宋子健; 郭迎九
Original assignee: Beijing Zhongxinyun Engineering Quality Inspection Co ltd
Current assignee: Beijing Zhongxinyun Engineering Quality Inspection Co ltd
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-06-19
Anticipated expiration: 2029-07-24

Abstract

The utility model discloses a safety helmet impact-resistant puncture tester, which relates to the technical field of safety helmet testers, and the technical scheme is characterized in that the safety helmet impact-resistant puncture tester comprises a base, a mounting rack, an electromagnet, a head die and a steel cone, wherein a protective device is arranged on the base, and the protective device comprises a mesh enclosure, a storage opening, a mesh door and a fixing mechanism; the fixing mechanism comprises a first fixing block, a connecting block, a second fixing block, a sliding groove, two first inserting blocks and a slot, wherein the sliding groove is formed in one side, close to the connecting block, of the second fixing block, the two first inserting blocks are connected in the sliding groove in a mutually close or far sliding mode, and the slot is formed in one side, close to the second fixing block, of the connecting block and used for inserting the first inserting blocks; a reset assembly used for enabling the two first insertion blocks to reset is arranged between the two first insertion blocks, and a driving assembly used for driving the two first insertion blocks to move relatively is arranged on the second fixing block. The utility model discloses a set up protector, can reduce head die piece and steel awl and cause the possibility of injury to the experimenter.

Description

Impact-resistant puncture tester for safety helmet

Technical Field

The utility model relates to a safety helmet tester technical field, more specifically the saying so, it relates to a safety helmet shock-resistant puncture tester.

Background

In the prior art, a safety helmet tester is usually adopted to test a safety helmet, the safety helmet tester is provided with an electromagnet, the electromagnet is used for adsorbing a puncture cone or an impact hammer, and when the electromagnet is powered off, the puncture cone or the impact hammer falls down and impacts the safety helmet below the puncture cone or the impact hammer.

In the prior art, reference can be made to a Chinese utility model patent with an authorization publication number of CN204128768U, which discloses a safety helmet testing device for electric power, comprising a mounting frame, a round pile welded on the side wall of the top of the mounting frame, an electromagnet and a base, wherein the bottom of the mounting frame is welded on the base, and the bottom surface of the base is provided with four rollers; the electromagnet is fixed on the round pile and faces downwards, and is used for adsorbing an auxiliary heavy object when the round pile is electrified; the base is provided with a sensor, a head die used for placing a safety helmet to be tested is fixed above the sensor, the head die is positioned under the electromagnet, and the auxiliary heavy object adsorbed on the electromagnet is an iron hammer or a steel cone used for testing. The utility model has the advantages of simple structure is compact, low in production cost, and the testing process is fairly convenient, is difficult to remove, can guarantee steady placing, is convenient for test.

However, the base is not provided with a protection device, and in the experiment process, the head die fragments and the steel cone may cause injury to experimenters.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a helmet impact resistance puncture tester, it can reduce head die piece and steel awl and cause the possibility of injury to the experimenter through setting up protector.

In order to achieve the above purpose, the utility model provides a following technical scheme: a safety helmet impact-resistant puncture tester comprises a base, a mounting frame, an electromagnet, a head die and a steel cone, wherein a protective device is arranged on the base and comprises a mesh enclosure detachably connected to the top of the base, an object placing opening formed in one side of the mesh enclosure, a mesh door hinged to the object placing opening and a fixing mechanism arranged on one side of the mesh enclosure and used for fixing one side, far away from a hinged point, of the mesh door; the fixing mechanism comprises a first fixing block fixedly connected to the outer wall of one side, far away from the hinge point, of the mesh door, a connecting block connected to the fixing block in a sliding manner along the length direction of the base, a second fixing block fixedly connected to one side, close to the connecting block, of the mesh cover, a sliding groove formed in one side, close to the connecting block, of the second fixing block, two first insert blocks connected into the sliding groove in a mutually close or far away sliding manner, and an inserting groove formed in one side, close to the second fixing block, of the connecting block and used for inserting the first; two be provided with between the first inserted block and be used for making the reset assembly that two first inserted blocks reset, be provided with on the second fixed block and be used for driving two first inserted blocks and do relative motion's drive assembly.

By adopting the technical scheme, in the process of performing an experiment on the head die, the net door is closed firstly, then the two first inserting blocks are made to approach each other through the driving assembly, and then the connecting block is moved towards the direction of approaching the first inserting blocks, so that the first inserting blocks are inserted into the slots; after the first insertion blocks are inserted into the slots, the first insertion blocks are loosened through the driving assembly, and at the moment, under the action of the reset assembly, the two first insertion blocks move away from each other, so that the two first insertion blocks are respectively abutted against the inner walls of the two sides of the slots, and the net door can be fixed; after the net door is fixed, the steel cone and the head die can be sealed, so that the possibility of injury to experimenters caused by head die fragments and the steel cone can be reduced.

The utility model discloses further set up to: the reset assembly comprises a plurality of springs arranged between two first inserting blocks; two ends of each spring are fixedly connected to the opposite inner sides of the two first insertion blocks respectively.

By adopting the technical scheme, when the two first inserting blocks are driven to move oppositely, the spring is in a compressed state; when two first inserted blocks are loosened, the two first inserted blocks are driven by the spring to move back to back, so that the connecting block is convenient to fix.

The utility model discloses further set up to: the driving assembly comprises a through hole which is formed in one side, far away from the mesh enclosure, of the second fixing block and communicated with the sliding groove, and two push blocks which are connected to two ends of the through hole in a sliding mode respectively; the two push blocks are respectively and fixedly connected to one side, away from the mesh enclosure, of the two first insertion blocks in a perpendicular mode.

Through adopting above-mentioned technical scheme, when needs make first inserted block and slot separation, promote two first inserted blocks through two ejector pads and move in opposite directions, then through to the direction removal connecting block of keeping away from the second fixed block alright make slot and first inserted block separation, easy operation, convenience like this.

The utility model discloses further set up to: one side rigid coupling that the connecting block is close to first fixed block has the dovetail block, the dovetail that supplies the dovetail block to slide along the length direction of base is seted up to one side that first fixed block is close to the connecting block.

Through adopting above-mentioned technical scheme, the dovetail has the guide effect to the forked tail piece to can reduce the connecting block and take place the possibility of deviating in the length direction of following the base in the process of sliding.

The utility model discloses further set up to: and a plurality of groups of connecting mechanisms for fixing the mesh enclosure are arranged on the base.

Through adopting above-mentioned technical scheme, under the long-time striking of steel awl or head die piece, the screen panel can probably take place to damage, through setting up fixed establishment, is convenient for carry out the dismouting to the screen panel, therefore is convenient for change the screen panel.

The utility model discloses further set up to: each group of connecting mechanisms comprises a mounting hole formed in the top of the base, a connecting pipe arranged in the mounting hole, a circular ring fixedly connected to the inner wall of the connecting pipe and a plurality of spring steel sheets which are sequentially and fixedly connected to the inner circumferential surface of the circular ring along the circumferential direction of the circular ring and are obliquely arranged towards the axial lead direction of the connecting pipe; the bottom of the mesh enclosure is fixedly connected with a second inserting block, and the second inserting block is inserted into the inner cavity of the connecting pipe; and a pushing assembly used for pushing the spring steel sheet to move towards the inner wall of the connecting pipe is arranged in the connecting pipe.

By adopting the technical scheme, when the mesh enclosure needs to be fixed, the pushing assembly is used for abutting against the spring steel sheet, the spring steel sheet is in a compressed state at the moment, then one end of the second insertion block is inserted into the connecting pipe, then the pushing assembly is loosened, the pushing assembly is reset under the action of the spring steel sheet, and after the pushing assembly is reset, the spring steel sheet abuts against the second insertion block at the moment, so that the second insertion block can be fixed; when the mesh enclosure needs to be detached, the spring steel sheet is pressed through the pushing assembly, and finally the second inserting block is pulled out; to sum up, through setting up coupling mechanism, be convenient for carry out the dismouting to the screen panel.

The utility model discloses further set up to: the pushing assembly comprises a pressing ring, a transition pipe communicated with one end of the pressing ring close to the connecting pipe and a pushing pipe communicated with one end of the transition pipe far away from the pressing ring; the pressing ring is arranged to protrude out of the top of the connecting pipe; the pushing pipe slides in the connecting pipe along the axial direction of the connecting pipe, the pushing pipe is in a round table shape, and the section area of the pushing pipe is sequentially increased from one end close to the transition pipe to one end far away from the transition pipe.

Through adopting above-mentioned technical scheme, the manual push press ring removes, and press ring removes and drives the removal of ejector sleeve pipe, is convenient for support the pressure to the spring steel sheet like this.

The utility model discloses further set up to: the inner wall of the top end of the connecting pipe is fixedly connected with a limiting ring, and the inner side wall of the limiting ring is abutted against the outer side wall of the transition pipe.

Through adopting above-mentioned technical scheme, through setting up the spacing ring, be convenient for carry on spacingly to pushing away pipe and pressing ring, therefore can reduce and promote the subassembly and take place the possibility of losing.

To sum up, the utility model discloses compare and have following beneficial effect in prior art:

1. in the process of carrying out an experiment on the head die, firstly closing the net door, then enabling the two first inserting blocks to be close to each other through the driving assembly, and then moving the connecting block to the direction close to the first inserting blocks so as to enable the first inserting blocks to be inserted into the inserting grooves; after the first insertion blocks are inserted into the slots, the first insertion blocks are loosened through the driving assembly, and at the moment, under the action of the reset assembly, the two first insertion blocks move away from each other, so that the two first insertion blocks are respectively abutted against the inner walls of the two sides of the slots, and the net door can be fixed; when the net door is fixed, the steel cone and the head die can be sealed, so that the possibility of injury to experimenters caused by head die fragments and the steel cone can be reduced;

2. when the first inserting block and the inserting groove are required to be separated, the two pushing blocks push the two first inserting blocks to move oppositely, and then the connecting block is moved in the direction far away from the second fixing block, so that the inserting groove and the first inserting block can be separated, and the operation is simple and convenient;

3. when the mesh enclosure needs to be fixed, the pushing assembly is used for abutting against the spring steel sheet, the spring steel sheet is in a compressed state at the moment, then one end of the second inserting block is inserted into the connecting pipe, then the pushing assembly is loosened, the pushing assembly is reset under the action of the spring steel sheet, and after the pushing assembly is reset, the spring steel sheet abuts against the second inserting block at the moment, so that the second inserting block can be fixed; when the mesh enclosure needs to be detached, the spring steel sheet is pressed through the pushing assembly, and finally the second inserting block is pulled out; to sum up, through setting up coupling mechanism, be convenient for carry out the dismouting to the screen panel.

Drawings

FIG. 1 is a schematic view of the overall structure of the embodiment;

FIG. 2 is a schematic view showing the structure of the fixing mechanism in the embodiment;

FIG. 3 is a partial cross-sectional view of a dovetail slot highlighted in an embodiment;

FIG. 4 is an exploded view of the embodiment highlighting a second insert;

FIG. 5 is a partial cross-sectional view of the embodiment with the spring steel plate highlighted.

In the figure: 1. a base; 11. a mounting frame; 12. an electromagnet; 13. a head die; 14. a steel cone; 2. a guard; 21. a mesh enclosure; 22. an object placing opening; 23. a net door; 3. a fixing mechanism; 31. a first fixed block; 311. a dovetail groove; 32. connecting blocks; 321. a dovetail block; 33. a second fixed block; 34. a chute; 35. a first insert block; 36. a slot; 4. a drive assembly; 41. a through hole; 42. a push block; 5. a reset assembly; 51. a spring; 6. a connecting mechanism; 61. mounting holes; 62. a connecting pipe; 63. a circular ring; 64. a spring steel sheet; 65. a second insert block; 7. a pushing assembly; 71. pressing a ring; 72. a transition duct; 73. pushing the pipe; 74. a limit ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Example (b): an impact-resistant puncture tester for a safety helmet is shown in figure 1 and comprises a base 1, a mounting frame 11 fixedly connected to the top of the base 1, an electromagnet 12 mounted on the inner side of the top of the mounting frame 11, a head die 13 mounted on the top of the base 1, and a steel cone 15 capable of being attracted with the electromagnet 12, wherein a protection device 2 is mounted on the base 1.

As shown in fig. 2 and 3, the protection device 2 includes a mesh enclosure 21 detachably connected to the top of the base 1, an object placing opening 22 opened on one side of the mesh enclosure 21, a mesh door 23 hinged to the object placing opening 22, and a fixing mechanism 3 installed on one side of the mesh enclosure 21 for fixing one side of the mesh door 23 away from the hinged point thereof; the fixing mechanism 3 comprises a first fixing block 31 fixedly connected to the outer wall of one side of the mesh door 23 far away from the hinge point, a connecting block 32 connected to the fixing block in a sliding manner along the length direction of the base 1, a second fixing block 33 fixedly connected to one side of the mesh cover 21 close to the connecting block 32, a sliding chute 34 arranged on one side of the second fixing block 33 close to the connecting block 32, two first inserting blocks 35 connected to the sliding chute 34 in a sliding manner along the vertical direction close to each other or far away from each other, and an inserting groove 36 arranged on one side of the connecting block 32 close to the second fixing block 33 and used for inserting the first inserting; one side of the connecting block 32, which is close to the first fixing block 31, is fixedly connected with a dovetail block 321, and one side of the first fixing block 31, which is close to the connecting block 32, is provided with a dovetail groove 311 for the dovetail block 321 to slide along the length direction of the base 1; a reset component 5 for resetting the two first insertion blocks 35 is arranged between the two first insertion blocks 35, and a driving component 4 for driving the two first insertion blocks 35 to move relatively is arranged on the second fixing block 33. In the experiment process of the head die 14, the net door 23 is closed, then the two first inserting blocks 35 are close to each other through the driving assembly 4, and then the connecting block 32 is moved towards the direction close to the first inserting blocks 35, so that the first inserting blocks 35 are inserted into the inserting grooves 36; after the first inserting blocks 35 are inserted into the slots 36, the driving assembly 4 releases the first inserting blocks 35, and at this time, under the action of the resetting assembly 5, the two first inserting blocks 35 move away from each other, so that the two first inserting blocks 35 are respectively abutted against the inner walls of the two sides of the slots 36, and the net door 23 can be fixed; after the net door 23 is fixed, the steel cone 15 and the head die 14 can be sealed, so that the possibility of injury to laboratory personnel caused by fragments of the head die 14 and the steel cone 15 can be reduced.

The driving assembly 4 comprises a through hole 41 which is arranged on one side of the second fixing block 33 far away from the mesh enclosure 21 and communicated with the chute 34, and two push blocks 42 which are respectively connected to two ends of the through hole 41 in a sliding manner; the two pushing blocks 42 are respectively and vertically fixed on one side of the two first inserting blocks 35 away from the mesh enclosure 21. When the first inserting block 35 needs to be separated from the inserting groove 36, the two pushing blocks 42 push the two first inserting blocks 35 to move towards each other, and then the connecting block 32 is moved towards the direction far away from the second fixing block 33, so that the inserting groove 36 can be separated from the first inserting blocks 35, and the operation is simple and convenient.

The return assembly 5 comprises a plurality of springs 51 arranged between two first inserts 35; both ends of each spring 51 are respectively fixed to the opposite inner sides of the two first insertion blocks 35. When the two first inserting blocks 35 are driven to move towards each other, the spring 51 is in a compressed state; when the two first insertion blocks 35 are released, the spring 51 drives the two first insertion blocks 35 to move back and forth, so that the connecting block 32 is fixed.

As shown in fig. 4 and 5, a plurality of sets of connecting mechanisms 6 for fixing the mesh enclosure 21 are mounted on the base 1, each set of connecting mechanism 6 includes a mounting hole 61 formed in the top of the base 1, a connecting pipe 62 disposed in the mounting hole 61, a ring 63 fixedly connected to the inner wall of the connecting pipe 62, and a plurality of spring steel sheets 64 sequentially fixedly connected to the inner circumferential surface of the ring 63 along the circumferential direction of the ring 63 and inclined toward the axial lead direction of the connecting pipe 62; the bottom of the mesh enclosure 21 is fixedly connected with a second inserting block 65, and the second inserting block 65 is inserted into the inner cavity of the connecting pipe 62; the connecting pipe 62 is provided with a pushing assembly 7 for pushing the spring steel sheet 64 to move close to the inner wall of the connecting pipe 62. When the mesh enclosure 21 needs to be fixed, the spring steel sheet 64 is pressed through the pushing assembly 7, the spring steel sheet 64 is in a compressed state at the moment, then one end of the second insertion block 65 is inserted into the connecting pipe 62, then the pushing assembly 7 is loosened, the pushing assembly 7 is reset under the action of the spring steel sheet 64, and after the pushing assembly 7 is reset, the spring steel sheet 64 presses the second insertion block 65 at the moment, so that the second insertion block 65 can be fixed; when the mesh enclosure 21 needs to be detached, the spring steel sheet 64 is pressed by the pushing assembly 7, and finally the second inserting block 65 is pulled out; in summary, the connecting mechanism 6 is provided to facilitate the detachment and installation of the mesh enclosure 21.

The pushing assembly 7 comprises a pressing ring 71, a transition pipe 72 communicated with one end of the pressing ring 71 close to the connecting pipe 62, and a pushing pipe 73 communicated with one end of the transition pipe 72 far away from the pressing ring 71; the pressing ring 71 is arranged by protruding the top of the connecting pipe 62; the pushing tube 73 slides in the connecting tube 62 along the axial direction of the connecting tube 62, the shape of the pushing tube 73 is truncated cone-shaped, and the cross-sectional area of the pushing tube 73 increases gradually from one end close to the transition tube 72 to one end far from the transition tube 72; the pressing ring 71 is pushed manually to move, and the pressing ring 71 moves to drive the pushing pipe 73 to move, so that the spring steel sheet 64 is pressed conveniently. A limiting ring 74 is fixedly connected to the inner wall of the top end of the connecting pipe 62, and the inner side wall of the limiting ring 74 abuts against the outer side wall of the transition pipe 72; the limiting ring 74 is provided to facilitate limiting of the pushing tube 73 and the pressing ring 71, so that the possibility of losing the pushing assembly 7 can be reduced.

The working principle of the impact-resistant puncture tester for the safety helmet is as follows:

in the experiment process of the head die 14, the net door 23 is closed, the two first inserting blocks 35 are pushed to move oppositely through the two pushing blocks 42, the connecting block 32 is moved towards the direction close to the first inserting blocks 35, so that the first inserting blocks 35 are inserted into the inserting grooves 36, the two first inserting blocks 35 move oppositely to compress the spring 51, and the spring 51 is in a compressed state; after the first inserting block 35 is inserted into the slot 36, the first inserting block 35 is released, and at this time, under the action of the spring 51, the two first inserting blocks 35 move away from each other, so that the two first inserting blocks 35 are respectively abutted against the inner walls of the two sides of the slot 36, and the mesh door 23 can be fixed; after the net door 23 is fixed, the steel cone 15 and the head die 14 can be sealed, so that the possibility of injury to laboratory personnel caused by fragments of the head die 14 and the steel cone 15 can be reduced.

When the mesh enclosure 21 needs to be fixed, the pressing ring 71 is manually pushed to move, the pressing ring 71 moves to drive the pushing pipe 73 to move, the pushing pipe 73 moves to abut against the spring steel sheet 64, the spring steel sheet 64 is in a compressed state at the moment, then one end of the second insertion block 65 is inserted into the connecting pipe 62, then the pushing assembly 7 is loosened, the pushing assembly 7 resets under the action of the spring steel sheet 64, after the pushing assembly 7 resets, the spring steel sheet 64 abuts against the second insertion block 65 at the moment, therefore, the second insertion block 65 can be fixed, and further, the mesh enclosure 21 can be fixed.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a helmet shock-resistant puncture tester, includes base (1), mounting bracket (11), electro-magnet (12), head die (13) and steel awl (14), its characterized in that: the protective device (2) is mounted on the base (1), and the protective device (2) comprises a mesh enclosure (21) detachably connected to the top of the base (1), an object placing opening (22) formed in one side of the mesh enclosure (21), a mesh door (23) hinged to the object placing opening (22), and a fixing mechanism (3) mounted on one side of the mesh enclosure (21) and used for fixing one side, away from a hinged point, of the mesh door (23); the fixing mechanism (3) comprises a first fixing block (31) fixedly connected to the outer wall of one side, far away from a hinge point, of the mesh door (23), a connecting block (32) connected to the fixing block in a sliding mode along the length direction of the base (1), a second fixing block (33) fixedly connected to one side, close to the connecting block (32), of the mesh cover (21), a sliding groove (34) formed in one side, close to the connecting block (32), of the second fixing block (33), two first inserting blocks (35) connected into the sliding groove (34) in a sliding mode and close to or far away from each other, and an inserting groove (36) formed in one side, close to the second fixing block (33), of the connecting block (32) and used for inserting the first inserting; two be provided with between first inserted block (35) and be used for making two reset components (5) of first inserted block (35) reset, be provided with on second fixed block (33) and be used for driving two drive assembly (4) that first inserted block (35) do relative motion.

2. The impact penetration tester for safety helmets according to claim 1, wherein: the return assembly (5) comprises a plurality of springs (51) arranged between two first inserts (35); two ends of each spring (51) are fixedly connected to the opposite inner sides of the two first inserting blocks (35) respectively.

3. The impact penetration tester for safety helmets according to claim 2, wherein: the driving assembly (4) comprises a through hole (41) which is arranged on one side of the second fixing block (33) far away from the mesh enclosure (21) and communicated with the sliding groove (34), and two push blocks (42) which are connected to two ends of the through hole (41) in a sliding mode respectively; the two push blocks (42) are respectively and vertically fixedly connected to one sides of the two first inserting blocks (35) far away from the net cover (21).

4. The impact penetration tester for safety helmets according to claim 1, wherein: one side rigid coupling that connecting block (32) are close to first fixed block (31) has dovetail block (321), dovetail (311) that confession dovetail block (321) slided along the length direction of base (1) are seted up to one side that first fixed block (31) are close to connecting block (32).

5. The impact penetration tester for safety helmets according to claim 1, wherein: the base (1) is provided with a plurality of groups of connecting mechanisms (6) for fixing the mesh enclosure (21).

6. The impact penetration tester of safety caps of claim 5, wherein: each group of connecting mechanisms (6) comprises a mounting hole (61) formed in the top of the base (1), a connecting pipe (62) arranged in the mounting hole (61), a circular ring (63) fixedly connected to the inner wall of the connecting pipe (62), and a plurality of spring steel sheets (64) which are sequentially fixedly connected to the inner circumferential surface of the circular ring (63) along the circumferential direction of the circular ring (63) and are obliquely arranged towards the axial lead direction of the connecting pipe (62); the bottom of the mesh enclosure (21) is fixedly connected with a second inserting block (65), and the second inserting block (65) is inserted into the inner cavity of the connecting pipe (62); and a pushing assembly (7) for pushing the spring steel sheet (64) to move towards the inner wall of the connecting pipe (62) is arranged in the connecting pipe (62).

7. The impact penetration tester of safety caps of claim 6, wherein: the pushing assembly (7) comprises a pressing ring (71), a transition pipe (72) communicated with one end, close to the connecting pipe (62), of the pressing ring (71), and a pushing pipe (73) communicated with one end, far away from the pressing ring (71), of the transition pipe (72); the pressing ring (71) is arranged by protruding the top of the connecting pipe (62); the pushing pipe (73) slides in the connecting pipe (62) along the axial direction of the connecting pipe (62), the pushing pipe (73) is in a circular truncated cone shape, and the cross-sectional area of the pushing pipe (73) is gradually increased from one end close to the transition pipe (72) to one end far away from the transition pipe (72).

8. The impact penetration tester of safety caps of claim 7, wherein: the inner wall of the top end of the connecting pipe (62) is fixedly connected with a limiting ring (74), and the inner side wall of the limiting ring (74) is abutted to the outer side wall of the transition pipe (72).