CN216410932U

CN216410932U - Alternating bending test and vibration test sharing device

Info

Publication number: CN216410932U
Application number: CN202122946658.XU
Authority: CN
Inventors: 黄展友
Original assignee: Guangzhou Paynes Pipeline Co ltd
Current assignee: Guangzhou Paynes Pipeline Co ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-04-29
Anticipated expiration: 2031-11-26

Abstract

The utility model belongs to the field of pipe connector tests, and particularly relates to a device for sharing an alternating bending test and a vibration test, which comprises a base, a fixing plate, a driving assembly and a fixing assembly, wherein the fixing plate is arranged on the base; a fixed plate is fixedly connected to the base; a pair of guide posts is symmetrically arranged on the lateral surface of the fixed plate; the guide post is arranged on the fixing plate; be equipped with the connecting plate on the guide pillar, through setting up the base, the guide pillar, the connecting plate, first pipe clamp frame, drive assembly and fixed subassembly, rely on fixed subassembly to fix the pipeline, drive assembly drives the connecting plate and carries out periodic reciprocating motion, thereby make pipeline damping vibration, when using, rely on the eccentric shaft sleeve of accommodate motor rotational speed and change difference, with this carry out alternation bending test and vibration test respectively, through the aforesaid setting, with this integrate two kinds of test devices into one, thereby reduce the input of test equipment, and reduce the occupation to the place, make things convenient for staff's use.

Description

Alternating bending test and vibration test sharing device

Technical Field

The utility model relates to the field of pipe connector tests, in particular to a device for an alternating bending test and a vibration test.

Background

A pipe joint is a component for connecting pipes, and is used for connecting a plurality of pipes.

In the prior art, after the pipe connector is produced, workers can test the pipe connector, so that the performance of the pipe connector is tested, and alternating bending tests and vibration tests can be performed on the pipe connector by using special devices respectively during the tests, but the existing device is large in size, so that a lot of space is occupied, and the pipe connector is inconvenient for the workers to use; therefore, a device for both the alternating bending test and the vibration test is proposed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

To remedy the deficiencies of the prior art, at least one of the technical problems set forth in the background is addressed.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model relates to a shared device for an alternating bending test and a vibration test, which comprises a base, a fixed plate, a driving assembly and a fixed assembly, wherein the fixed plate is arranged on the base; a fixed plate is fixedly connected to the base; a pair of guide posts is symmetrically arranged on the lateral surface of the fixed plate; the guide post is arranged on the fixing plate; the guide post is provided with a connecting plate; a through hole is formed in the position, corresponding to the guide pillar, of the connecting plate; the guide post penetrates through the through hole; a first pipe clamping frame is fixedly connected to the side face of the connecting plate; the driving assembly is arranged on one side of the connecting plate, which is far away from the first pipe clamping frame; the fixed component is arranged on the base, and the two test devices are integrated into one through the arrangement, so that the investment of test equipment is reduced, and the occupied area is reduced.

Preferably, the drive assembly comprises a motor; the motor is fixedly connected to the fixing plate and arranged on one side, away from the first pipe clamping frame, of the connecting plate; an eccentric shaft sleeve is arranged at the output end of the motor; the surface of the eccentric shaft sleeve is fixedly connected with a first connecting rod; the end part of the first connecting rod is provided with a thread groove; a second connecting rod is connected in the thread groove through threads; the end part of the second connecting rod is arranged on one side, far away from the first pipe clamping frame, of the connecting plate through the trunnion and the lug seat, so that the connecting plate is driven to move.

Preferably, the fixing assembly comprises a stinger; a supporting plate is fixedly connected to one side of the base, which is far away from the fixed plate; a pair of second pipe clamping frames are symmetrically and fixedly connected to two sides of the supporting plate; one side rigid coupling that the base is close to the fixed plate has a set of pipe-supporting rack to this fixes the pipeline that is surveyed.

Preferably, a linear bearing is arranged in the through hole; the linear bearing is detachably and fixedly connected with the connecting plate through a fastener; the linear bearing is sleeved on the guide post, and friction force of the connecting plate during sliding can be reduced by arranging the linear bearing, so that the service life is prolonged.

Preferably, a lubricating component is arranged on the side wall of the fixed plate; the lubricating assembly comprises an oil box and an oil guide unit; the pair of oil boxes is fixedly connected to the fixing plate; a pair of push rods is symmetrically and fixedly connected to the two sides of the connecting plate; a piston rod is fixedly connected to one side of the push rod, which is far away from the motor; a piston cylinder is arranged at the end part of the piston rod; the piston rod is connected in the piston cylinder in a sliding manner; the rodless cavity of the piston cylinder is communicated with the oil box through an air pipe; the piston cylinder is fixedly connected with the fixing plate; the oil guide unit is arranged on the linear bearing, so that the friction force is further reduced, and the noise during working is reduced.

Preferably, the oil guide unit includes a first hose; a group of oil guide grooves are formed in the linear bearing; the oil guide groove is provided with an annular groove; the oil guide grooves are communicated with each other through the annular groove; the oil guide groove is communicated with the oil box through the first hose, so that the interior of the linear bearing can be lubricated.

Preferably, a pair of collecting rings is symmetrically and fixedly connected to two sides of the linear bearing; a collecting groove is formed in the collecting ring; the collecting tank and the oil box are communicated with each other through a second hose; one-way valves are mounted at the end parts of the first hose and the second hose, so that lubricating oil is recycled.

Preferably, a chute is formed in the collecting ring; a fixing ring is connected in the sliding groove in a sliding manner; the inner side wall of the fixing ring is fixedly connected with a cotton sleeve; the side of the sliding groove is connected with a cover plate through threads, and the surface of the guide pillar can be wiped through a cotton sleeve, so that lubricating oil on the surface of the guide pillar is reduced, and the lubricating oil is prevented from dropping on the workbench.

Preferably, the cotton sleeve is sleeved with an annular air bag; the annular air bag is arranged inside the collecting ring; the annular air bag is communicated with the rodless cavity of the piston cylinder through the third hose, so that the cleaning effect of the cotton sleeve on the guide pillar can be improved.

Preferably, the surface of the annular air bag is fixedly connected with an elastic rod; the top end of the elastic rod is fixedly connected with the side wall of the collecting groove, so that the annular air bag can be fixed and supported.

The utility model has the advantages that:

1. according to the utility model, the base, the guide pillar, the connecting plate, the first pipe clamping frame, the driving assembly and the fixing assembly are arranged, the pipeline is fixed by the fixing assembly, the driving assembly drives the connecting plate to do periodic reciprocating motion, so that the pipeline is damped and vibrated, when the device is used, the alternating bending test and the vibration test are respectively carried out by adjusting the rotating speed of the motor and replacing different eccentric shaft sleeves, and through the arrangement, the two test devices are integrated into one, so that the investment of test equipment is reduced, the occupation of a field is reduced, and the use of workers is facilitated.

2. According to the utility model, the piston cylinder, the piston rod, the oil box, the air pipe and the first hose are arranged and matched by means of the parts, so that lubricating oil is injected into the linear bearing, the interior of the linear bearing is lubricated, the friction force is reduced, and the noise during working is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

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

FIG. 2 is a schematic view of a fixing plate according to the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic view of a fixed ring structure of the present invention;

in the figure: 11. a base; 12. a fixing plate; 13. a connecting plate; 14. a guide post; 15. a first pipe clamp; 21. an eccentric shaft sleeve; 22. a first link; 23. a second link; 24. an ear mount; 31. a support plate; 32. A second pipe clamp; 33. a stinger; 41. a linear bearing; 51. a piston rod; 52. a piston cylinder; 53. an oil box; 54. an oil guide groove; 55. an annular groove; 61. a collection ring; 62. a second hose; 71. a fixing ring; 72. a cover plate; 73. cotton sleeves; 81. an annular air bag; 82. a third hose; 9. an elastic rod.

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.

Specific examples are given below.

Referring to fig. 1-4, a device for testing alternating bending and vibration includes a base 11, a fixing plate 12, a driving assembly and a fixing assembly; a fixed plate 12 is fixedly connected to the base 11; a pair of guide posts 14 are symmetrically arranged on the side surface of the fixed plate 12; the guide posts 14 are mounted on the fixed plate 12; the guide post 14 is provided with a connecting plate 13; a through hole is formed in the position, corresponding to the guide post 14, of the connecting plate 13; the guide post 14 penetrates through the through hole; a first pipe clamping frame 15 is fixedly connected to the side surface of the connecting plate 13; the driving assembly is arranged on one side of the connecting plate 13 far away from the first pipe clamping frame 15; the fixing component is arranged on the base 11; the drive assembly comprises a motor; the motor is fixedly connected to the fixing plate 12 and is arranged on one side, away from the first pipe clamping frame 15, of the connecting plate 13; an eccentric shaft sleeve 21 is arranged at the output end of the motor; the surface of the eccentric shaft sleeve 21 is fixedly connected with a first connecting rod 22; the end of the first connecting rod 22 is provided with a thread groove; a second connecting rod 23 is connected in the thread groove through threads; the end part of the second connecting rod 23 is arranged on one side of the connecting plate 13 far away from the first pipe clamping frame 15 through a trunnion and an ear seat 24; the securing assembly comprises a stinger 33; a supporting plate 31 is fixedly connected to one side of the base 11 far away from the fixing plate 12; a pair of second pipe clamping frames 32 are symmetrically and fixedly connected to two sides of the supporting plate 31; a group of stingers 33 are fixedly connected to one side of the base 11 close to the fixed plate 12; a linear bearing 41 is arranged in the through hole; the linear bearing 41 is detachably and fixedly connected with the connecting plate 13 through a fastener; the linear bearing 41 is sleeved on the guide post 14; in the using process, the pipeline and the pipe connector are assembled, a straight pipeline and a bent pipeline can be assembled according to different pipe connectors, two ends of the straight pipeline are fixed through a second pipe clamping frame 32, a first pipe clamping frame 15 and a second pipe clamping frame 32 are clamping mechanisms for fixing the pipeline, the bent L-shaped or U-shaped pipeline is fixed through a pipe supporting frame 33, the first pipe clamping frame 15 is connected with a pipeline test part and then electrified, the motor is an electromagnetic speed regulating motor, the rotating speed of the motor is adjusted according to test requirements, then the motor drives an eccentric shaft sleeve 21 to rotate, then a first connecting rod 22 and a second connecting rod 23 drive a connecting plate 13 to carry out periodic test reciprocating motion, so that the pipeline connection part vibrates, meanwhile, the connecting plate 13 and a linear bearing 41 slide on a guide post 14, when a worker can replace the eccentric shaft sleeve 21 with different eccentric values according to requirements, corresponding to the test amplitude, the end of the second connecting rod 23 is hinged on the connecting plate 13 through the trunnion and the ear seat 24, by arranging the linear bearing 41, the friction force of the connecting plate 13 during sliding can be reduced, the service life is prolonged, the pipe deflects +/-10 mm in the middle connecting range in an alternating bending test, the test is carried out by 10 ten thousand load changes under the conditions that 15Hz lasts for 20s, the pause is 2min, the alternating bending lasts for 13 hours, the test is carried out, a vibration test is carried out, a corresponding eccentric shaft sleeve 21 is selected, the eccentric value of the eccentric shaft sleeve 21 corresponds to the test amplitude, the vibration lasts for 84 minutes, the vibration test is carried out, through the arrangement, the two test devices are integrated into one, thereby reduce test equipment's input to reduce area, the staff can install more equipment in the place, and volume staff activity space is bigger, makes things convenient for staff's use.

As an embodiment of the present invention, a lubricating assembly is disposed on the side wall of the fixing plate 12; the lubricating assembly comprises an oil box 53 and an oil guide unit; the pair of oil boxes 53 are fixedly connected to the fixed plate 12; a pair of push rods is symmetrically and fixedly connected to two sides of the connecting plate 13; a piston rod 51 is fixedly connected to one side of the push rod away from the motor; a piston cylinder 52 is arranged at the end part of the piston rod 51; the piston rod 51 is connected in the piston cylinder 52 in a sliding manner; the rodless cavity of the piston cylinder 52 is communicated with the oil box 53 through an air pipe; the piston cylinder 52 is fixedly connected with the fixing plate 12; the oil guide unit is arranged on the linear bearing 41; the oil guide unit comprises a first hose; a group of oil guide grooves 54 are formed in the linear bearing 41; the oil guide groove 54 is provided with an annular groove 55; a set of said oil-guiding grooves 54 are mutually communicated through an annular groove 55; the oil guide groove 54 is communicated with the oil box 53 through a first hose; when connecting plate 13 slided, its connecting plate 13 can drive piston rod 51 and slide, later piston rod 51 removes and to impress the gas in the piston cylinder 52 in the oil box 53, then the inside lubricating oil of oil box 53 can enter into through first hose and lead in the oil groove 54, inject lubricating oil in the oil box 53 earlier before the use, communicate a plurality of oil grooves 54 of leading through ring channel 55, with this can be to the inside lubrication of linear bearing 41, thereby further reduce frictional force, reduce the noise of during operation.

As an embodiment of the present invention, a pair of collecting rings 61 are symmetrically fixed to both sides of the linear bearing 41; a collecting groove is formed in the collecting ring 61; the collecting tank is communicated with the oil box 53 through a second hose 62; one-way valves are mounted at the end parts of the first hose and the second hose 62; when the piston rod 51 is reversely reset in an arc shape, gas in the oil box 53 is pumped back to the piston cylinder 52, then negative pressure is generated, so that lubricating oil in the collecting ring 61 is sucked through the second hose 62, after the lubricating oil is sprayed, the lubricating oil can flow out from two ends of the linear bearing 41, the lubricating oil is recovered, a check valve user enables liquid in the first hose and the second hose 62 to flow in a single direction, the first hose can only flow out the lubricating oil, and the second hose 62 can only suck the lubricating oil.

As an embodiment of the present invention, a chute is formed in the collecting ring 61; a fixing ring 71 is connected in the sliding groove in a sliding manner; the inner side wall of the fixing ring 71 is fixedly connected with a cotton sleeve 73; the side surface of the chute is connected with a cover plate 72 through threads; when using, can clean the surface of guide pillar 14 through cotton cover 73 to reduce the lubricating oil on the guide pillar 14 surface, drip on the workstation with this reduction lubricating oil, when the installation, fill in solid fixed ring 71 in the spout, later fix solid fixed ring 71 through apron 72, with this installation to cotton cover 73 of completion, the clamp is passed through at the both ends of guide pillar 14 and is installed on fixed plate 12, through the aforesaid setting, with this can be convenient for staff's later stage to change and install cotton cover 73.

As an embodiment of the present invention, the cotton cover 73 is sleeved with an annular air bag 81; the annular air bag 81 is arranged inside the collecting ring 61; the annular air bag 81 is communicated with the rodless cavity of the piston cylinder 52 through a third hose 82; the surface of the annular air bag 81 is fixedly connected with an elastic rod 9; the top end of the elastic rod 9 is fixedly connected with the side wall of the collecting tank; when the cleaning device is used for a long time, more lubricating oil is sucked into the cotton sleeve 73, so that the cleaning effect of the surface of the guide post 14 is reduced, when the piston rod 51 moves into the piston cylinder 52, gas in the piston cylinder 52 enters the annular air bag 81 through the third hose 82, the annular air bag 81 is collided, then the cotton sleeve 73 is squeezed, the lubricating oil in the cotton sleeve 73 is squeezed out, the cleaning effect of the cotton sleeve 73 on the guide post 14 can be improved, and the annular air bag 81 can be fixed and supported by arranging the elastic rod 9.

The working principle is that in the using process, a pipeline and a pipe connector are assembled, the pipeline can be assembled into a straight pipeline and a bent pipeline according to different pipe connectors, two ends of the straight pipeline are fixed through a second pipe clamping frame 32, a first pipe clamping frame 15 and a second pipe clamping frame 32 are clamping mechanisms of the existing fixed pipeline, the bent L-shaped or U-shaped pipeline is fixed through a pipe supporting frame 33, the first pipe clamping frame 15 is connected with a pipeline test part and then is electrified, a motor is an electromagnetic speed regulating motor, the rotating speed of the motor is adjusted according to test requirements, then the motor drives an eccentric shaft sleeve 21 to rotate, then a first connecting rod 22 and a second connecting rod 23 drive a connecting plate 13 to do periodic reciprocating motion, so that the pipeline connection part vibrates, meanwhile, the connecting plate 13 and a linear bearing 41 slide on a guide post 14, and during testing, a worker can replace the eccentric shaft sleeve 21 with different eccentric values according to requirements, the end part of the second connecting rod 23 is hinged on the connecting plate 13 through the trunnion and the lug seat 24, the friction force when the connecting plate 13 slides can be reduced through arranging the linear bearing 41, the service life is prolonged, the alternating bending test is carried out, the pipe deflects +/-10 mm in the middle connecting range, the pipe lasts 20s at 15Hz, the time is stopped for 2min, the alternating bending is full of 13 hours, the test is carried out by 10 ten thousand load changes, the vibration test is carried out, the corresponding eccentric shaft sleeve 21 is selected, the eccentric value of the eccentric shaft sleeve 21 corresponds to the test amplitude, the vibration test is carried out for 84 minutes, the vibration test is carried out, through the arrangement, the two test devices are integrated into one, the input of test equipment is reduced, the floor area is reduced, when the connecting plate 13 slides, the connecting plate 13 drives the piston rod 51 to slide, then the piston rod 51 moves, and the gas in the piston cylinder 52 is pressed into the oil box 53, then the lubricating oil in the oil box 53 enters the oil guide grooves 54 through the first hose, before use, the lubricating oil is injected into the oil box 53, the oil guide grooves 54 are communicated through the annular groove 55, so that the interior of the linear bearing 41 can be lubricated, the friction force is further reduced, and the noise during operation is reduced, when the piston rod 51 is reset in the arc direction, the air in the oil box 53 is pumped back to the piston cylinder 52, then negative pressure is generated, so that the lubricating oil in the collecting ring 61 is sucked through the second hose 62, after the lubricating oil is sprayed, the lubricating oil flows out from the two ends of the linear bearing 41, so that the lubricating oil is recovered, a check valve user enables the liquid in the first hose and the second hose 62 to flow in a single direction, so that the first hose can only flow out the lubricating oil, the second hose 62 can only suck the lubricating oil, the surface of the guide post 14 can be wiped through the cotton sleeve 73, so that the lubricating oil on the surface of the guide post 14 is reduced, so as to reduce the lubricating oil from dropping on the worktable, when in installation, the fixing ring 71 is plugged into the chute, then the fixing ring 71 is fixed by the cover plate 72, thus completing the installation of the cotton cover 73, the two ends of the guide post 14 are installed on the fixed plate 12 through the clamp, through the arrangement, the cotton sleeve 73 can be conveniently replaced and installed by the staff in the later period, in long-term use, more lubricant is sucked into the cotton sleeve 73, so that the cleaning effect of the surface of the guide post 14 is reduced, when the piston rod 51 moves into the piston cylinder 52, the gas in the piston cylinder 52 enters the annular air bag 81 through the third hose 82, the annular air bag 81 is collided, then the cotton cover 73 is squeezed to extrude out the lubricating oil in the cotton cover 73, so that the cleaning effect of the cotton cover 73 on the guide post 14 can be improved, and the annular air bag 81 can be fixed and supported by arranging the elastic rod 9.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed.

Claims

1. The utility model provides an alternating bending test and vibration test sharing device which characterized in that: comprises a base (11), a fixing plate (12), a driving component and a fixing component; a fixed plate (12) is fixedly connected to the base (11); a pair of guide posts (14) are symmetrically arranged on the side surface of the fixed plate (12); the guide post (14) is arranged on the fixing plate (12); a connecting plate (13) is arranged on the guide post (14); a through hole is formed in the position, corresponding to the guide post (14), of the connecting plate (13); the guide post (14) penetrates through the through hole; a first pipe clamping frame (15) is fixedly connected to the side surface of the connecting plate (13); the driving assembly is arranged on one side, far away from the first pipe clamping frame (15), of the connecting plate (13); the fixing component is arranged on the base (11).

2. The apparatus of claim 1, wherein: the drive assembly comprises a motor; the motor is fixedly connected to the fixing plate (12) and arranged on one side, away from the first pipe clamping frame (15), of the connecting plate (13); an eccentric shaft sleeve (21) is mounted at the output end of the motor; a first connecting rod (22) is fixedly connected to the surface of the eccentric shaft sleeve (21); a thread groove is formed in the end part of the first connecting rod (22); a second connecting rod (23) is connected in the thread groove through threads; the end part of the second connecting rod (23) is arranged on one side of the connecting plate (13) far away from the first pipe clamping frame (15) through a trunnion and an ear seat (24).

3. The apparatus for testing alternating bending and vibration according to claim 2, wherein: the securing assembly comprises a stinger (33); a supporting plate (31) is fixedly connected to one side of the base (11) far away from the fixing plate (12); a pair of second pipe clamping frames (32) are symmetrically and fixedly connected to two sides of the supporting plate (31); one side of the base (11) close to the fixing plate (12) is fixedly connected with a group of stingers (33).

4. The apparatus of claim 3, wherein: a linear bearing (41) is arranged in the through hole; the linear bearing (41) is detachably and fixedly connected with the connecting plate (13) through a fastener; the linear bearing (41) is sleeved on the guide post (14).

5. The device for testing alternating bending and vibration according to claim 4, wherein: a lubricating component is arranged on the side wall of the fixed plate (12); the lubricating component comprises an oil box (53) and an oil guide unit; the pair of oil boxes (53) are fixedly connected to the fixing plate (12); a pair of push rods is symmetrically and fixedly connected to the two sides of the connecting plate (13); a piston rod (51) is fixedly connected to one side of the push rod, which is far away from the motor; a piston cylinder (52) is arranged at the end part of the piston rod (51); the piston rod (51) is connected in the piston cylinder (52) in a sliding manner; the rodless cavity of the piston cylinder (52) is communicated with the oil box (53) through an air pipe; the piston cylinder (52) is fixedly connected with the fixing plate (12); the oil guide unit is arranged on the linear bearing (41).

6. The device for testing alternating bending and vibration according to claim 5, wherein: the oil guide unit comprises a first hose; a group of oil guide grooves (54) are formed in the linear bearing (41); an annular groove (55) is formed in the oil guide groove (54); a group of the oil guide grooves (54) are communicated with each other through an annular groove (55); the oil guide groove (54) is communicated with the oil box (53) through a first hose.

7. The apparatus of claim 6, wherein: a pair of collecting rings (61) are symmetrically and fixedly connected to two sides of the linear bearing (41); a collecting groove is formed in the collecting ring (61); the collecting tank is communicated with the oil box (53) through a second hose (62); one-way valves are mounted at the ends of the first hose and the second hose (62).

8. The apparatus of claim 7, wherein: a chute is formed in the collecting ring (61); a fixed ring (71) is connected in the sliding groove in a sliding manner; the inner side wall of the fixing ring (71) is fixedly connected with a cotton sleeve (73); the side surface of the sliding chute is connected with a cover plate (72) through threads.

9. The apparatus of claim 8, wherein: the cotton sleeve (73) is sleeved with an annular air bag (81); the annular air bag (81) is arranged inside the collecting ring (61); the annular air bag (81) is communicated with the rodless cavity of the piston cylinder (52) through a third hose (82).

10. The apparatus of claim 9, wherein: the surface of the annular air bag (81) is fixedly connected with an elastic rod (9); the top end of the elastic rod (9) is fixedly connected with the side wall of the collecting tank.