CN114839061A

CN114839061A - High-molecular material anti-cracking performance detection device

Info

Publication number: CN114839061A
Application number: CN202210455588.4A
Authority: CN
Inventors: 张昕睿; 王济奎; 周志昂
Original assignee: Yancheng Institute of Technology
Current assignee: Yancheng Institute of Technology
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-08-02

Abstract

The invention discloses a high polymer material crack resistance detection device, which comprises a bottom plate, wherein a fixed frame is fixed at the top of the bottom plate, the fixed frame comprises a long groove arranged on the side wall of the fixed frame, two slidable adjusting blocks are arranged in the long groove, two clamping components used for fixing a high polymer plate are arranged on the inner wall of the long groove between the two adjusting blocks in a sliding manner, the two clamping components are respectively clamped at two ends of the high polymer plate, and tension springs are connected between the two clamping components and the two adjusting blocks respectively; two can pull two extension springs tensile when regulating block moves back to each other to carry out biaxial tension to the polymer board through two centre gripping subassemblies. According to the invention, by means of controlling variables, the time that the polymer plate can bear under the action of a certain pulling force and a certain impact force, namely the service life under the environment can be detected, and the most preferable polymer plate can be selected by comparing the results.

Description

High-molecular material anti-cracking performance detection device

Technical Field

The invention relates to the technical field of high polymer material detection, in particular to a high polymer material anti-cracking performance detection device.

Background

The polymer material is also called polymer material, and is a material formed by mixing a polymer compound as a matrix and other additives, and the polymer material is widely applied to the fields of industrial manufacturing, building materials, biomedicine, aerospace and the like along with the continuous development of the polymer material.

At present, when a synthesized high polymer material is applied to different fields, the synthesized high polymer material is widely used due to superior performances such as high mechanics, low density and electrical insulation, but when the synthesized high polymer material is manufactured and used, the synthesized high polymer material can cause certain loss under the influence of various factors such as use environment, service life and external influence, so that the synthesized high polymer material needs to be maintained or replaced, and in order to maximize the use time and optimize the utilization rate of the synthesized high polymer material, the synthesized high polymer material needs to be subjected to an anti-cracking performance test to obtain the maximum service life of the synthesized high polymer material, and meanwhile, the synthesized high polymer material is convenient to prepare for maintenance or replacement in advance.

Disclosure of Invention

The invention aims to provide a device for detecting the crack resistance of a high polymer material, which can detect the time that a high polymer plate can bear under the action of certain pulling force and certain impact force, namely the service life of the high polymer plate under the environment by controlling variables, can select the most preferable high polymer plate by comparing results, and solves the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a high molecular material anti-cracking performance detection device, includes the bottom plate, the top of bottom plate is fixed with the mount, the mount is including seting up the elongated slot at its lateral wall, and installs two slidable regulating blocks, two in the elongated slot inner wall slidable mounting between the regulating block has two clamping components that are used for fixed polymer board, and two clamping components centre gripping respectively at the both ends of polymer board, two clamping components respectively with be connected with the extension spring between two regulating blocks.

Two can pull two extension springs tensile when regulating block moves back to each other to carry out biaxial tension to the polymer board through two centre gripping subassemblies.

Preferably, a vertical plate is fixed to the top of the bottom plate, a bottom-opening installation box is fixed to the outer wall, close to the fixed frame, of the vertical plate through a connecting block, a lifting plate capable of sliding up and down in a reciprocating mode is installed on the inner wall of the installation box, two installation plates are fixed to the bottom of the lifting plate, a fixed shaft capable of overturning 180 degrees is installed between the two installation plates, a vertical hole is formed in the outer wall of the fixed shaft, a vertical rod is fixed to the vertical hole, and a knocking head is fixed to one end of the vertical rod.

Preferably, be located the install bin inner wall slidable mounting of lifter plate top has the regulating plate, be connected with the spring between regulating plate and the lifter plate, the screw has been seted up at the top of install bin, and screw female connection has the second screw rod, rotate between the bottom of second screw rod and the regulating plate and be connected.

Preferably, the montant is kept away from the one end of beating the head and is rotated and install the rotating tube, the one end that the beating head was kept away from to the rotating tube is fixed with the head of beating, just distance between head of beating and the fixed axle axis is the same with the distance between head of beating and the fixed axle axis, one of them the outer wall of mounting panel is seted up porosely, and is downthehole to install rotatable installation axle, the one end that the installation axle is close to the beating head is fixed with the carousel, the outer wall of carousel is fixed with annular rack, the outer wall of rotating tube is fixed with the gear, mesh between gear and the annular rack, the hole that can supply fixed axle male is seted up at the center of carousel.

Preferably, the install bin is close to the outer wall of riser and has been seted up perpendicular groove, the outer wall of regulating plate is fixed with the L type piece of wearing out perpendicular groove, the inside of L type piece is seted up porosely, and installs rotatable pivot in the hole, the outer wall that the pivot is close to both ends all has the rotation driver plate through parallel key slidable mounting, the install bin is close to the outer wall of two rotation driver plates and has all seted up perpendicular groove, just the outer wall of lifter plate both sides all is fixed with the driving lever of wearing out outside perpendicular groove, when two the rotation driver plate is through the protruding meeting intermittent type formula contact that sets up on it and stir the driving lever and remove when rotating.

Preferably, the one end that the carousel was kept away from to the installation axle is fixed with the drive wheel, the one end that the pivot is close to the drive wheel is fixed with the action wheel, be connected through belt transmission between action wheel and the drive wheel, the adjusting part that is used for self-adaptation regulation belt tension degree is installed to the outer wall of install bin.

Preferably, two the cover is all installed to the outer wall of rotation driver plate opposite face and is changeing epaxial sleeve pipe, and two sheathed tube outer walls all rotate and install the adjustable ring, two holes have been seted up at the top of connecting block, and two downthehole equal vertical slidable mounting have the second connecting rod, two the bottom of second connecting rod rotates respectively with between the outer wall of two adjustable rings and installs first connecting rod, two the top of second connecting rod is fixed with the connection handle jointly, can make two adjustable rings do relative or back on the back of the body removal through second connecting rod and first connecting rod when pressing the connection handle downwards.

Preferably, the clamping assembly comprises Contraband-shaped frames which are slidably mounted in the elongated slot, the openings of the two Contraband-shaped frames are opposite, and clamping plates for clamping and fixing the polymer plate are mounted at the openings.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, by means of controlling variables, the time that the polymer plate can bear under the action of a certain pulling force and a certain impact force, namely the service life under the environment can be detected, and the most preferable polymer plate can be selected by comparing the results.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is an enlarged view of the portion A in FIG. 2;

FIG. 4 is a schematic perspective view of the second embodiment of the present invention;

FIG. 5 is a right side view schematic of the present invention;

FIG. 6 is a schematic cross-sectional view taken along line B-B of FIG. 5 in accordance with the present invention;

fig. 7 is a schematic structural view of the cross-sectional view taken along line C-C of fig. 5 in accordance with the present invention.

In the figure: 1. a base plate; 2. a fixed mount; 3. a vertical plate; 4. contraband form rack; 5. a splint; 6. a tension spring; 7. an adjusting block; 8. a first screw; 9. installing a box; 10. polishing head; 11. a knocking head; 12. mounting a plate; 13. a fixed shaft; 14. rotating the tube; 15. a vertical rod; 16. a second screw; 17. a polymer plate; 18. a rotating shaft; 19. rotating the drive plate; 20. a deflector rod; 21. a limiting block; 22. a turntable; 23. a driving wheel; 24. installing a shaft; 25. a driving wheel; 26. an adjustment assembly; 27. an L-shaped block; 28. a gear; 29. a lifting plate; 30. an adjusting plate; 31. a spring; 32. an annular rack; 33. an adjusting ring; 34. a first link; 35. a second link; 36. a connecting handle; 37. and (4) connecting the blocks.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment;

referring to fig. 1 to 7, the present invention provides a technical solution: the utility model provides a macromolecular material anti-cracking performance detection device, includes bottom plate 1, and the top of bottom plate 1 is fixed with mount 2, and mount 2 is including seting up the elongated slot at its lateral wall, and installs two slidable regulating blocks 7 in the elongated slot, and elongated slot inner wall slidable between two regulating blocks 7 has two centre gripping subassemblies that are used for fixed polymer board 17, and two centre gripping subassemblies centre gripping respectively at the both ends of polymer board 17, two centre gripping subassemblies respectively with be connected with extension spring 6 between two regulating blocks 7.

Two regulating blocks 7 can pull two extension springs 6 to stretch when moving back to carry out biaxial tension to polymer board 17 through two centre gripping subassemblies.

When detecting, will carry out the centre gripping through two centre gripping subassemblies to polymer board 17's both ends fixedly, then drive two regulating blocks 7 through exterior structure and slide mutually in the opposite directions, two extension springs 6 are stretched simultaneously, then extension spring 6 can carry out biaxial stretching to polymer board 17 through two centre gripping subassemblies, through making extension spring 6 elongate to the certain extent, then observe polymer board 17 to the time when drawing and splitting, so on, can draw the time that the same polymer board 17 can persist under the effort of dragging that receives different size, or the time that can persist under the effort of dragging of the same size of different polymer boards 17, then usable polymer board 17 under different scenes or usage can be preferred according to the result.

By controlling the variables, the service lives of different polymer plates 17 can be detected when the polymer plates are subjected to pulling forces of different magnitudes, and the polymer plates 17 adapted to different environments can be selected by comparing the results.

Further, the top of bottom plate 1 is fixed with riser 3, the outer wall that riser 3 is close to mount 2 is fixed with bottom open-ended install bin 9 through connecting block 37, but reciprocal gliding lifter plate 29 from top to bottom is installed to the inner wall of install bin 9, the bottom of lifter plate 29 is fixed with two mounting panels 12, but install the fixed axle 13 of 180 degrees upsets between two mounting panels 12, the outer wall of fixed axle 13 has been seted up and has been erect the hole, and erect downthehole internal fixation and have montant 15, the one end of montant 15 is fixed with strikes head 11.

It can be known from the preceding, to it further prescribes a limit to, first macromolecular plate 17 is under the effect that receives invariable pulling force, drives lifter plate 29 through external mechanism and constantly reciprocates from top to bottom, then lifter plate 29 can drive the head 11 of knocking of installing on it and constantly reciprocates to strike macromolecular plate 17, until its fracture, like this through the mode of control variable, can detect macromolecular plate 17 under the effect that receives certain pulling force and certain striking force, the time that can bear, be in the life under this environment promptly.

Similarly, the service life of different polymer plates 17 under the service condition is detected by replacing different polymer plates 17, and the most preferable polymer plate 17 can be selected by comparing the results.

Further, an adjusting plate 30 is slidably mounted on the inner wall of the installation box 9 above the lifting plate 29, a spring 31 is connected between the adjusting plate 30 and the lifting plate 29, a screw hole is formed in the top of the installation box 9, a second screw 16 is connected to the screw hole in an internal thread manner, and the bottom end of the second screw 16 is rotatably connected with the adjusting plate 30.

The handle is installed at the top end of the second screw rod 16, the second screw rod 16 is driven to rotate by rotating the handle, the adjusting plate 30 can be driven to move by the second screw rod 16 under the limiting effect of the installing box 9 on the adjusting plate 30, the lifting plate 29 can be driven to move downwards under the elastic action of the spring 31, the elastic force of the spring 31 can be added to the lifting plate 29 when the lifting plate moves downwards, the impact force of the knocking head 11 on the high polymer plate 17 is increased, the compression amount of the spring 31 is adjusted by moving the adjusting plate 30, and the effect of increasing the knocking force of the knocking head 11 is achieved.

Therefore, the content before combination can detect the time that the polymer plate 17 can bear under the action of different impact forces when being subjected to constant pulling force, namely the service life under the action of different impact forces, and in turn, the polymer plate 17 with longer service life can be preferably selected under the time needing to bear the impact forces.

Further, a rotating pipe 14 is rotatably installed at one end, away from the knocking head 11, of the vertical rod 15, a knocking head 10 is fixed at one end, away from the knocking head 11, of the rotating pipe 14, a distance between the knocking head 10 and an axis of the fixed shaft 13 is the same as that between the knocking head 11 and the axis of the fixed shaft 13, a hole is formed in the outer wall of one of the mounting plates 12, a rotatable mounting shaft 24 is installed in the hole, a turntable 22 is fixed at one end, close to the knocking head 11, of the mounting shaft 24, an annular rack 32 is fixed on the outer wall of the turntable 22, a gear 28 is fixed on the outer wall of the rotating pipe 14, the gear 28 is meshed with the annular rack 32, and a hole, into which the fixed shaft 13 can be inserted, is formed in the center of the turntable 22.

As can be seen from the foregoing, the vertical rod 15 can be driven to rotate by rotating the fixing shaft 13, as shown in fig. 6, by pulling the fixing shaft 13, the limiting block 21 on the fixing shaft 13 is separated from the slot on the mounting plate 12, the gear 28 is also separated from the annular rack 32, then the fixing shaft 13 is rotated by 180 degrees, the knocking head 11 is vertically upward, and the sanding head 10 is vertically downward, then the limiting block 21 on the fixing shaft 13 is inserted into the slot on the mounting plate 12 again to be locked, then the mounting shaft 24 is driven to rotate through an external mechanism, so as to drive the rotary table 22 to rotate, the rotating pipe 14 is driven to rotate under the meshing action of the annular rack 32 and the gear 28, and then the sanding head 10 is driven to rotate, so as to thin the surface of the polymer plate 17.

Before polishing, the polishing head 10 can be firstly attached to the surface of the polymer plate 17, then the position of the adjusting plate 30 is moved, the spring 31 is compressed, then the polishing head 10 is rotated, so that the spring 31 can be gradually reset in the polishing process of the polishing head 10, and thus, the thinning degree of the polymer plate 17 can be controlled by controlling the compression amount of the spring 31.

After the polymer plate 17 is thinned, the steps are repeated, the positions of the polishing head 10 and the knocking head 11 are changed, and then the knocking head 11 is used for knocking, so that the time borne by the polymer plate 17 after the polymer plate is subjected to constant pulling force and is abraded can be detected, namely the service life of the polymer plate is prolonged.

Then, by controlling one of the variables and the others as the fixed quantities, the service life of the polymer plate 17 in different states can be detected.

And because the head 10 and the head 11 of beating are in the state of coaxial setting, and beat the head 11 moreover when beating, the head 10 of beating also rotates, utilizes angular momentum conservation, can make the axle of head 10 of beating and the head 11 of beating can keep vertical state, is difficult to change, and then can increase and beat the head 11 and can keep a direction throughout and can not rock when beating, further can improve the accuracy that its detected.

Since the force of the knocking by the knocking head 11 is related to the compression amount of the spring 31, the distance between the axis of the fixed shaft 13 and the axis of the sanding head 10 is the same as the distance between the axis of the fixed shaft 13 and the axis of the knocking head 11, so that the compression amount of the spring 31 can be prevented from being changed after the polymer plate 17 is thinned, and the detection result is more accurate.

And a dust collection mechanism can be further installed, so that the waste materials after polishing can be conveniently recovered and collected.

Further, install bin 9 has been close to the outer wall of riser 3 and has been seted up perpendicular groove, the outer wall of regulating plate 30 is fixed with the L type piece 27 of wearing out perpendicular groove, the inside of L type piece 27 is seted up porosely, and downthehole rotatable pivot 18 of installing, the outer wall that pivot 18 is close to both ends all has rotation driver plate 19 through parallel key slidable mounting, install bin 9 is close to two outer walls that rotate driver plate 19 and has all seted up perpendicular groove, and the outer wall of lifter plate 29 both sides all is fixed with the driving lever 20 of wearing out outside perpendicular groove, can intermittent type formula contact and stir driving lever 20 and remove through the arch that sets up on it when two rotation driver plates 19 rotate.

Drive pivot 18 through accessible gear motor drive and rotate, then drive and rotate driver plate 19 and rotate, can contact and stir driving lever 20 and remove through the arch that sets up on it when rotating driver plate 19 and rotating, thereby drive lifter plate 29 rebound, spring 31 is compressed simultaneously, when the arch that rotates on driver plate 19 breaks away from driving lever 20, can drive lifter plate 29 and move down under spring 31's elastic force effect this moment, make and strike head 11 and strike polymer board 17, the compressive capacity through regulating spring 31 can reach the effect of adjusting the dynamics of striking like this.

Furthermore, a driving wheel 25 is fixed at one end of the mounting shaft 24 away from the turntable 22, a driving wheel 23 is fixed at one end of the rotating shaft 18 close to the driving wheel 25, the driving wheel 23 is in transmission connection with the driving wheel 25 through a belt, and an adjusting component 26 for adaptively adjusting the tension of the belt is mounted on the outer wall of the mounting box 9.

When the rotating shaft 18 rotates, the driving wheel 23 is driven to rotate, the driving wheel 25 is driven to rotate through belt transmission, so that the mounting shaft 24 is driven to rotate, and the tightness of the belt can be adaptively adjusted through the adjusting assembly 26 due to the fact that the compression amount of the spring 31 changes.

Further, the sleeve pipe of cover in pivot 18 is all installed to the outer wall of two rotation driver plates 19 opposite faces, and two sheathed tube outer walls all rotate and install adjustable ring 33, two holes have been seted up at connecting block 37's top, and two downthehole equal vertical slidable mounting have second connecting rod 35, the bottom of two second connecting rods 35 respectively with rotate between two adjustable ring 33's the outer wall and install first connecting rod 34, the top of two second connecting rods 35 is fixed with jointly and is connected 36, can make two adjustable ring 33 do relative or back-to-back movement through second connecting rod 35 and first connecting rod 34 when pressing connection 36 downwards.

When needing to polish, through pressing connection handle 36 downwards, can make two adjustable rings 33 do relative or back-to-back movement through second connecting rod 35 and first connecting rod 34 when connecting handle 36 to make the arch on the rotation driver plate 19 stagger the plane with driving lever 20, when pivot 18 rotates to drive installation axle 24 through the cooperation between the structure and rotate like this, can not make lifter plate 29 reciprocate, avoid having the striking effect to polymer board 17 when polishing to polishing head 10, reduced polishing head 10 to polymer board 17's influence, the accuracy of polymer board 17 testing result has been improved indirectly.

Further, the clamping assembly comprises a v-shaped 21274installed in the long groove in a sliding mode, the opening directions of the two Contraband-shaped frames 4 are opposite, and clamping plates 5 used for clamping and fixing the high polymer plates 17 are installed at the openings.

Referring to fig. 1, the polymer plate 17 is clamped and fixed by the clamping plates 5 and 21274, the inner wall of the frame 4, and the length of the clamped polymer plate 17 can be controlled to control the area of the impact surface of the polymer plate 17, so that the polymer plates 17 with different bearing areas can be detected.

Example two;

the method is the same as the first embodiment, except that the polymer plate 17 is pulled until the polymer plate is broken, so that the deformation amount of the tension spring 6 can calculate the ultimate tensile force applied when the polymer plate 17 is broken, the tensile crack resistance of the polymer plate 17 can be obtained, different polymer plates 17 are replaced, and the effect of detecting the ultimate pulling force data which can be borne by different types of polymer plates 17 is achieved.

In summary, by controlling the variables, one of the factors is a variable, and the others are quantitative, the crack resistance, i.e. the service life, of the polymer board 17 under the influence of different factors can be detected.

The standard parts used in the present embodiment may be purchased directly from the market, and the non-standard structural components described in the specification and drawings may also be obtained by processing directly according to the common general knowledge of the prior art without any doubt, and the connection manner of the respective parts is a conventional manner well-established in the prior art, and the machines, parts and equipment are of a type conventional in the prior art, so that detailed description thereof is omitted.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a high molecular material anti-cracking performance detection device, includes bottom plate (1), its characterized in that: the top of the bottom plate (1) is fixed with a fixing frame (2), the fixing frame (2) comprises a long groove arranged on the side wall of the fixing frame, two slidable adjusting blocks (7) are arranged in the long groove, two clamping assemblies used for fixing a polymer plate (17) are slidably arranged on the inner wall of the long groove between the two adjusting blocks (7), the two clamping assemblies are respectively clamped at two ends of the polymer plate (17), and tension springs (6) are respectively connected between the two clamping assemblies and the two adjusting blocks (7);

two regulating block (7) can pull two extension springs (6) and stretch when moving mutually in the opposite directions to carry out biaxial tension to polymer board (17) through two centre gripping subassemblies.

2. The device for detecting the crack resistance of the high polymer material according to claim 1, wherein: the top of bottom plate (1) is fixed with riser (3), the outer wall that riser (3) are close to mount (2) is fixed with bottom open-ended install bin (9) through connecting block (37), but reciprocal gliding lifter plate (29) from top to bottom is installed to the inner wall of install bin (9), the bottom of lifter plate (29) is fixed with two mounting panels (12), two but install fixed axle (13) of 180 degrees upsets between mounting panel (12), the outer wall of fixed axle (13) has been seted up and has been erect the hole, and erects the downthehole and be fixed with montant (15), the one end of montant (15) is fixed with strikes head (11).

3. The device for detecting the crack resistance of the high polymer material according to claim 2, wherein: be located install bin (9) inner wall slidable mounting of lifter plate (29) top has regulating plate (30), be connected with spring (31) between regulating plate (30) and lifter plate (29), the screw has been seted up at the top of install bin (9), and screw female connection has second screw rod (16), rotate between the bottom of second screw rod (16) and regulating plate (30) and be connected.

4. The device for detecting the crack resistance of the high polymer material according to claim 3, wherein: a rotating pipe (14) is rotatably arranged at one end of the vertical rod (15) far away from the knocking head (11), a grinding head (10) is fixed at one end of the rotating pipe (14) far away from the knocking head (11), and the distance between the axis of the polishing head (10) and the axis of the fixed shaft (13) is the same as the distance between the axis of the polishing head (11) and the axis of the fixed shaft (13), wherein the outer wall of one of the mounting plates (12) is provided with a hole, a rotatable mounting shaft (24) is arranged in the hole, a turntable (22) is fixed at one end of the mounting shaft (24) close to the knocking head (11), an annular rack (32) is fixed on the outer wall of the rotating disc (22), a gear (28) is fixed on the outer wall of the rotating tube (14), the gear (28) is meshed with the annular rack (32), and a hole for inserting the fixed shaft (13) is formed in the center of the rotary disc (22).

5. The device for detecting the crack resistance of the high polymer material according to claim 4, wherein: install bin (9) are close to the outer wall of riser (3) and have seted up perpendicular groove, the outer wall of regulating plate (30) is fixed with L type piece (27) of wearing out perpendicular groove, the inside of L type piece (27) is seted up porosely, and downthehole rotatable pivot (18) of installing, the outer wall that pivot (18) are close to both ends all has rotation driver plate (19) through parallel key slidable mounting, install bin (9) are close to the outer wall of two rotation driver plates (19) and have all seted up perpendicular groove, just the outer wall of lifter plate (29) both sides all is fixed with wears out perpendicular inslot outside driving lever (20), when two rotate driver plate (19) and move through protruding meeting intermittent type contact and stirring driving lever (20) that set up on it when rotating driver plate (19).

6. The device for detecting the crack resistance of the high polymer material according to claim 5, wherein: the one end of carousel (22) is kept away from in installation axle (24) is fixed with drive wheel (25), the one end that pivot (18) are close to drive wheel (25) is fixed with action wheel (23), be connected through belt drive between action wheel (23) and drive wheel (25), adjusting part (26) that are used for self-adaptation regulation belt tension degree are installed to the outer wall of install bin (9).

7. The device for detecting the crack resistance of the high polymer material according to claim 5, wherein: two the sleeve pipe of cover on pivot (18) is all installed to the outer wall of rotation driver plate (19) opposite face, and two sheathed tube outer walls all rotate and install adjustable ring (33), two holes have been seted up at the top of connecting block (37), and two downthehole equal vertical slidable mounting have second connecting rod (35), two the bottom of second connecting rod (35) rotates respectively with between the outer wall of two adjustable rings (33) and installs first connecting rod (34), two the top of second connecting rod (35) is fixed with jointly and is connected (36), can make two adjustable rings (33) do relative or carry on the back of the body and move when pressing down to connect (36) through second connecting rod (35) and first connecting rod (34).

8. The device for detecting the crack resistance of the high polymer material according to claim 1, wherein: the clamping assembly comprises Contraband-shaped frames (4) which are slidably mounted in long grooves, the opening directions of the two Contraband-shaped frames (4) are opposite, and clamping plates (5) used for clamping and fixing polymer plates (17) are mounted at the openings.