CN113682630A

CN113682630A - Biological safety cabinet convenient to access

Info

Publication number: CN113682630A
Application number: CN202110979270.1A
Authority: CN
Inventors: 王燚; 宋晓艺; 蒋雪梅
Original assignee: Wuxi Zenzer Accurate Medical Laboratories Co ltd
Current assignee: Wuxi Zenzer Accurate Medical Laboratories Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2021-11-23

Abstract

The invention relates to a biosafety cabinet convenient for storing and taking, which comprises a shell, wherein a sealing device is arranged in the shell, an angle adjusting device is arranged in the sealing device, a circulating disinfection device is arranged at the top of the shell, a closing device is arranged at one end, close to the shell, of the sealing device, a clamping device is arranged in the closing device, and a suction device is arranged at the top of the closing device, so that the biosafety cabinet convenient for storing and taking has the following beneficial effects that: the first electric push rod is used for driving the movable plate to rotate, so that the angle of the movable plate is changed, and the articles behind can be conveniently and quickly taken; the inner shell is provided with a supporting block, so that the supporting position of the fixed plate can be changed conveniently, and the sealing performance of the device is improved by adhering a sealing ring on the movable door; the spring presses the second clamping block to enable the second clamping block to move and limit the position of the stored article; the output rod is driven to move by the hydraulic rod, and the clamping block is driven to move by opening the motor, so that articles can be taken and used conveniently; through using the air pump extraction closed incasement portion air to enter into adsorbing a section of thick bamboo, prevent that inside noxious substance from flowing out.

Description

Biological safety cabinet convenient to access

Technical Field

The invention relates to the technical field of biological preservation equipment, in particular to a biological safety cabinet convenient to store and take.

Background

The biological safety cabinet is a biological safety preservation device, and through using the sealed cabinet body, objects such as biological sample, culture dish, storage bottle can be stored, prevent that the poisonous and harmful substance that contains from spreading in biology or the chemicals, lead to danger, influence user of service's physical and mental health development.

Present biological safety cabinet is unfavorable for taking out of inside object, lead to article collision each other when taking easily, lead to damaging, the circulation disinfection structure that lacks in the current device, breed poisonous and harmful substance or bacterium virus diffusion in the device easily, influence the safety of device, when leading to opening the safety cabinet, meet with danger, need open the safety cabinet door in the current equipment after, just can take out article, lead to poisonous and harmful substance to flow easily, be difficult to guarantee the security, lack clamping device in the device, need handheld article, take out it, it is dangerous.

Disclosure of Invention

The invention provides a biosafety cabinet convenient to store and take, which solves the problems that the existing biosafety cabinet is not beneficial to taking out objects inside, and objects are easy to collide with each other and damage is caused when the existing biosafety cabinet is used.

To solve the problems set forth in the background art described above.

In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a biosafety cabinet convenient to access, includes the shell, the inside sealing device that is equipped with of shell, the inside angle adjusting device that is equipped with of sealing device, the shell top is equipped with circulation degassing unit, sealing device is close to shell one end and is equipped with the closing device, the inside clamping device that is equipped with of closing device, the closing device top is equipped with the getter device, sealing device includes the inner shell, the inside fixedly connected with inner shell of shell, shell one end articulates there is the dodge gate, angle adjusting device includes the fixed plate, the fixed plate top is rotated and is connected with the fly leaf, the fly leaf bottom is equipped with an electric putter, closing device includes the closure case.

In further embodiment, the inner shell is close to shell one end and has been seted up the seal groove, the chamber of ventilating has been seted up between inner shell and the shell, the adhesion has the sealing washer on the dodge gate, sealing washer size of dimensions suits with seal groove size of dimensions, the inside even fixedly connected with supporting shoe of inner shell, the supporting shoe top-supporting has the fixed plate, is provided with the supporting shoe through the inner shell, is convenient for change the support position of fixed plate for highly can adapting to different storage article height between the fixed plate, the use of the device of being convenient for has the sealing washer through the adhesion on the dodge gate, increases the leakproofness of device, prevents to reveal.

In a further embodiment, the spout has been seted up at the fly leaf top, the inside fixedly connected with slide bar of spout, slide bar both ends sliding connection has first fixture block and second fixture block respectively, first fixture block one end fixedly connected with spring is kept away from to the second fixture block, the spring housing is on the slide bar, the arc wall has all been seted up to the one end that first fixture block and second fixture block are close to each other, just the inside adhesion of arc wall has the foam-rubber cushion, extrudees the second fixture block through the spring for the second fixture block removes, restricts the position of storing object, prevents that the fly leaf from rotating, leads to the storing object to empty, leads to dangerous, has the foam-rubber cushion through the adhesion, prevents to press from bad storing object.

In a further embodiment, the circulating disinfection device comprises a disinfection box, one end of the outer wall of the disinfection box is fixedly connected with a fan, the air inlet of the fan sequentially penetrates through the tops of an outer shell and an inner shell, one end of the inner cavity of the disinfection box, which is close to an air outlet of the fan, is fixedly connected with three baffles, the inner cavity of the disinfection box is in threaded connection with an ultraviolet lamp between the two baffles, one end of the inner cavity of the disinfection box, which is far away from the fan, is fixedly connected with two layers of filter screens, the bottom of each filter screen is fixedly connected with a fan, one end of the outer wall of the disinfection box, which is close to the fan, penetrates through the top of the outer shell, is fixedly connected to the bottom of the inner shell, air is extracted by the fan to enter the disinfection box, the direction of the air flowing is changed by the baffles, the air can conveniently pass through the ultraviolet lamp to disinfect the air, and the air is driven by the fan to flow through the filter screens, the gas is convenient to filter.

In a further embodiment, the closed box is fixedly connected to the movable door, an opening is formed in the closed box close to one end of the inner shell, a second electric push rod is fixedly connected to the top of the closed box, the second electric push rod is fixedly connected to the movable door, a telescopic rod is fixedly connected to the output end of the second electric push rod, a sealing plate is fixedly connected to one end of the telescopic rod, the sealing plate is far away from one end of the telescopic rod and is slidably connected to the inside of the closed box, two sealing covers are connected to one end of the closed box, which is far away from the outer shell, through threads, the second electric push rod drives the sealing plate to open, and articles can be taken conveniently by opening the sealing covers.

In a further embodiment, clamping device includes the hydraulic stem, the hydraulic stem is in closed incasement portion, hydraulic stem output end fixedly connected with delivery rod, hydraulic stem one end fixedly connected with fixed slide rail is kept away from to the delivery rod, fixed slide rail outer wall one end fixedly connected with motor, the motor output end passes fixed slide rail one end threaded connection and has two-way threaded rod, the motor has two grip blocks through two-way threaded rod threaded connection, and two grip blocks are symmetrical each other at two-way threaded rod, drive the delivery rod through the hydraulic stem and remove, open the motor and drive the grip block and remove, and the centre gripping of being convenient for is at article both ends, is convenient for take article.

In a further embodiment, the getter device is including the case of breathing in, case fixed connection breathes in is on the dodge gate, the incasement portion fixedly connected with air pump breathes in, air pump one end fixedly connected with intake pipe, intake pipe one end fixedly connected with discharge pipe is kept away from to the air pump, threaded connection has an adsorption cylinder on the discharge pipe, intake pipe and the equal fixed connection of discharge pipe are on closed box, through using the air pump extraction closed incasement portion air to enter into the adsorption cylinder, prevent that inside noxious material from flowing out.

In a further embodiment, the fixed plate quantity is three, three the even joint of fixed plate is inside the inner shell, the fly leaf is kept away from inner shell inner wall one end and is articulated on the fixed plate, the fly leaf is close to inner shell inner wall one end bottom contact and has the output of first electric putter, and is articulated through fly leaf and fixed plate, the rotation of the fly leaf of being convenient for.

The invention has the following beneficial effects:

1. according to the invention, the first electric push rod is used for driving the movable plate to rotate, so that the angle of the movable plate is changed, articles on the movable plate can rotate, the articles behind the movable plate can be conveniently and rapidly taken, and the possibility of mutual collision is reduced.

2. Be provided with the supporting shoe through the inner shell, be convenient for change the support position of fixed plate for highly can adapt to different storage article height between the fixed plate, the use of the device of being convenient for has the sealing washer through the adhesion on the dodge gate, increases the leakproofness of device, prevents to reveal.

3. Through spring extrusion second fixture block for the second fixture block removes, and restriction storage object's position prevents that the fly leaf from rotating, leads to storage object to empty, leads to danger, has the foam-rubber cushion through the adhesion, prevents to press from both sides bad storage object.

4. The hydraulic rod drives the output rod to move, the motor is started to drive the clamping blocks to move, and the clamping is convenient to clamp at two ends of an article, so that the article can be taken conveniently.

5. Through using the air pump extraction closed incasement portion air to enter into adsorbing a section of thick bamboo, prevent that inside noxious substance from flowing out.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

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

FIG. 2 is a schematic front view of the angle adjustment apparatus of the present invention;

FIG. 3 is an enlarged view of the structure at A of the present invention;

FIG. 4 is a schematic front sectional view of the circulation sterilization apparatus of the present invention;

FIG. 5 is a schematic front cross-sectional view of a closure device of the present invention;

fig. 6 is a front sectional structural view of the air sucking device of the present invention.

In the figure: 1. a housing; 2. a sealing device; 21. an inner shell; 22. a sealing groove; 23. a movable door; 24. a seal ring; 25. a support block; 3. an angle adjusting device; 31. a fixing plate; 32. a movable plate; 33. a chute; 34. a slide bar; 35. a first clamping block; 36. a second fixture block; 37. a spring; 38. a first electric push rod; 4. a circulating sterilizing device; 41. a sterilizing box; 42. a fan; 43. a baffle plate; 44. an ultraviolet lamp; 45. a filter screen; 46. a fan; 47. removing the pipeline; 5. a closure device; 51. closing the box; 52. an opening; 53. a second electric push rod; 54. a telescopic rod; 55. a sealing plate; 56. a sealing cover; 6. a clamping device; 61. a hydraulic lever; 62. an output rod; 63. fixing the slide rail; 64. a motor; 65. a clamping block; 7. a suction device; 71. an air suction box; 72. an air pump; 73. an air inlet pipe; 74. an adsorption cylinder; 75. and (4) discharging the water.

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.

Example 1

Referring to fig. 1-3, the invention relates to a biosafety cabinet convenient for storing and taking and a process technology, comprising an outer shell 1, a sealing device 2 is arranged in the outer shell 1, the sealing performance of the device is improved through the sealing device 2, leakage is prevented, an angle adjusting device 3 is arranged in the sealing device 2, the angle of an article is convenient to change, a circulating disinfection device 4 is arranged at the top of the outer shell 1, the disinfection of the internal air is convenient, a closing device 5 is arranged at one end of the sealing device 2 close to the outer shell 1, the article is convenient to take and use and is prevented from leaking, a clamping device 6 is arranged in the closing device 5, the article can be conveniently and quickly taken out through the clamping device 6, the direct contact of hands is prevented, an air suction device 7 is arranged at the top of the closing device 5, air is absorbed through the air suction device 7, harmful substances in air are prevented from directly leaking, the sealing device 2 comprises an inner shell 21, the inner shell 21 is fixedly connected to the inside of the outer shell 1, the movable door 23 is hinged to one end of the outer shell 1, the closing device 5 comprises a closing box 51, the angle adjusting device 3 comprises a fixing plate 31, the movable plate 32 is rotatably connected to the top of the fixing plate 31, and a first electric push rod 38 is arranged at the bottom of the movable plate 32.

The inside article of biological safety cabinet can't be taken among the current device, owing to sheltered from by other article, has influenced the sight, and people are because be difficult to see article clearly when taking, so take out more troublesome, can't confirm required article when not, if use the device that changes the article angle, can make things convenient for people to observe and take required article to article.

In order to help people take out articles, in the embodiment, the first electric push rod 38 is used to drive the movable plate 32 to rotate, so that the angle of the movable plate 32 can be changed conveniently, the position of the articles can be observed clearly, and people can take out the articles in the inner shell 21 conveniently.

Seal groove 22 has been seted up to inner shell 21 periphery, and the adhesion has sealing washer 24 on the dodge gate 23, and through the rotation of dodge gate 23 for sealing washer 24 and the mutual joint of seal groove 22 increase the sealing performance of device, the inside even fixedly connected with supporting shoe 25 of inner shell 21.

In this embodiment, the angle of the movable plate 32 is changed, which easily causes the article to be toppled over and damaged, the three fixed plates 31 are supported at the top of the support block 25, one end of the movable plate 32, which is far away from the inner wall of the inner shell 21, is hinged to the fixed plate 31, the bottom of one end of the movable plate 32, which is near to the inner wall of the inner shell 21, contacts with the output end of the first electric push rod 38, the top of the movable plate 32 is provided with the chute 33, the chute 33 is internally and fixedly connected with the slide rod 34, one end of the slide rod 34, which is far away from the first fixture block 35, is sleeved with the spring 37, one end of the spring 37 is fixedly connected with the second fixture block 36, the ends, which are near to each other, of the first fixture block 35 and the second fixture block 36 are both provided with arc-shaped grooves, and the sponge pads are adhered to the inside of the arc-shaped grooves, the spring 37 extrudes the second fixture block 36, so that the second fixture block 36 moves along the slide rod 34, which is convenient for the first fixture block 35 and the second fixture block 36 to extrude the article mutually, prevent the article from loosening and avoid the problem of toppling over the article.

Example 2

Please refer to fig. 4, in order to increase the sterilization effect, the circulating sterilization device 4 includes a fan 42, an air inlet at one end of the fan 42 is fixedly connected inside the inner shell 21, the gas inside the inner shell 21 is convenient to be extracted and enters the inside of the sterilization box 41, an air outlet of the fan 42 is connected inside the sterilization box 41 through a pipeline, two baffles 43 are fixedly connected at the bottom of the inner cavity of the sterilization box 41, an ultraviolet lamp 44 is fixedly connected between the two baffles 43 at the top of the inner cavity of the sterilization box 41, the direction of the gas is changed through the baffles 43, and the gas is convenient to be sterilized.

In this embodiment, in order to fully disinfect the air, increase the flow velocity of air, 41 inner chamber one end fixedly connected with two-layer filter 45 of disinfect box, filter 45 bottom fixedly connected with fan 46 of bottom, pipeline 47 is got rid of to 41 outer wall bottom one end fixedly connected with of disinfect box, it passes 1 top one end fixed connection of shell in the inner shell 21 bottom to get rid of pipeline 47, increase filterable effect through using two-layer filter 45, get rid of pipeline 47 through the use and let in the air to the inner shell 21 bottom, the clean air extrusion gas of being convenient for enters into disinfect box 41 inside and disinfects.

Example 3

Please refer to fig. 5 and 6, when taking articles conveniently, reduce the leakage of toxic and harmful substances, the harm is generated, the closed box 51 is fixedly connected to the movable door 23, the inside of the closed box 51 is far away from one end of the movable door 23 and is provided with an opening 52, the closed box 51 is close to one end of the opening 52 and is slidably connected with a sealing plate 55, a telescopic rod 54 is fixedly connected to the top of the sealing plate 55, the top of the telescopic rod 54 is fixedly connected with a second electric push rod 53 output end, the outer wall of the closed box 51 is in threaded connection with two sealing covers 56, the two sealing covers 56 are symmetrical to each other, the hand can be inserted into the protective glove by opening the sealing cover 56, the work inside of the closed box 51 is convenient, the sealing cover 56 is driven to move by opening the second electric push rod 53, and articles are convenient to take.

In this embodiment, in order to further reduce the leakage of toxic and harmful substances, the air suction device 7 is used, the air suction device 7 includes an air suction box 71, the air suction box 71 is fixedly connected to the movable door 23, an air pump 72 is fixedly connected to the inside of the air suction box 71, one end of the air pump 72 is fixedly connected to an air inlet pipe 73 and an exhaust pipe 75, an adsorption cylinder 74 is screwed in the middle of the exhaust pipe 75, the air inlet pipe 73 and the exhaust pipe 75 are both fixedly connected to the closed box 51, the closed box 51 is filled with the entering objects, the closed sealing cover 56 is used to seal the closed box 51, and the air is pumped to be input into the closed box 51 after being sterilized, so as to prevent the leakage.

Example 4

Referring to fig. 5, in order to clamp a part of toxic and harmful substances and reduce direct contact, the clamping device 6 includes a fixed slide rail 63, one end of the fixed slide rail 63 is fixedly connected with an output rod 62, the output rod 62 is fixedly connected to the output end of the hydraulic rod 61, one end of the output rod 62 is fixedly connected with the fixed slide rail 63, the fixed slide rail 63 is rotatably connected with a bidirectional threaded rod, the output end of a motor 64 passes through the fixed slide rail 63 and is fixedly connected with the bidirectional threaded rod, two clamping blocks 65 are symmetrically and threadedly connected to the bidirectional threaded rod, the length of the device can be changed by using the hydraulic rod 61, the two clamping blocks 65 are driven by using the motor 64 to simultaneously move towards two ends or the middle, the distance between the two clamping blocks is changed, and the device can conveniently clamp the objects.

Specifically, when the invention is used, firstly, the fixing plate 31 is placed at the top of the supporting block 25, the heights of different articles are adjusted, the articles are placed and clamped between the first clamping block 35 and the second clamping block 36, the second clamping block 36 is pressed by the spring 37, the second clamping block 36 moves along the sliding rod 34, the second clamping block 36 is matched with the first clamping block 35 conveniently, the articles are prevented from being clamped by the sponge cushion adhered to the first clamping block 35 and the second clamping block 36, then the movable door 23 is closed, the sealing ring 24 adhered to one end of the movable door 23 can be clamped in the sealing groove 22 on the inner shell 21, the sealing performance of the movable door 23 is increased, the internal leakage of the device is prevented, and dangers are caused, then the fan 42 in the circulating disinfection device 4 is opened, the fan 42 drives air to enter the disinfection box 41, the moving direction of the air is changed by the baffle 43, after the ultraviolet lamp 44 on the baffle 43 is sterilized and disinfected, the fan 46 is turned on to draw air, the air is filtered by the filter screen 45 and returns to the inside of the inner shell 21 to keep the inside air clean, then the first electric push rod 38 is turned on to drive the movable plate 32 to rotate, the angle of the movable plate 32 is changed, articles can be observed conveniently, and the articles can be taken and used conveniently;

the second electric push rod 53 is opened to drive the telescopic rod 54 to move, so that the sealing plate 55 is opened; use hydraulic stem 61, make output rod 62 stretch out, make grip block 65 be in article both ends, open motor 64 this moment, drive grip block 65 and remove, be convenient for the centre gripping article, enter into inside closed box 51, close closing plate 55 this moment, open the inside air pump 72 of getter device 7, drive the air and enter into in adsorbing a section of thick bamboo 74 through intake pipe 73, disinfect the back and carry the air and get back to inside closed box 51 through discharge pipe 75, open sealed lid 56 at last, can study and observe article.

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 biosafety cabinet convenient to store and take is characterized by comprising an outer shell (1), wherein a sealing device (2) is arranged inside the outer shell (1), an angle adjusting device (3) is arranged inside the sealing device (2), a circulating disinfection device (4) is arranged at the top of the outer shell (1), a closing device (5) is arranged at one end, close to the outer shell (1), of the sealing device (2), a clamping device (6) is arranged inside the closing device (5), an air suction device (7) is arranged at the top of the closing device (5), the sealing device (2) comprises an inner shell (21), the inner shell (21) is fixedly connected inside the outer shell (1), a movable door (23) is hinged to one end of the outer shell (1), the angle adjusting device (3) comprises a fixing plate (31), and a movable plate (32) is rotatably connected to the top of the fixing plate (31), the bottom of the movable plate (32) is provided with a first electric push rod (38), and the closing device (5) comprises a closing box (51).

2. The biosafety cabinet convenient to access according to claim 1, wherein a sealing groove (22) is formed in one end, close to the outer shell (1), of the inner shell (21), a ventilation cavity is formed between the inner shell (21) and the outer shell (1), a sealing ring (24) is adhered to the movable door (23), the size of the sealing ring (24) is matched with that of the sealing groove (22), supporting blocks (25) are uniformly and fixedly connected inside the inner shell (21), and a fixing plate (31) is supported at the top of each supporting block (25).

3. The biosafety cabinet convenient to access according to claim 1, wherein a sliding groove (33) is formed in the top of the movable plate (32), a sliding rod (34) is fixedly connected inside the sliding groove (33), a first clamping block (35) and a second clamping block (36) are respectively slidably connected to two ends of the sliding rod (34), a spring (37) is fixedly connected to one end, away from the first clamping block (35), of the second clamping block (36), the spring (37) is sleeved on the sliding rod (34), arc-shaped grooves are formed in ends, close to each other, of the first clamping block (35) and the second clamping block (36), and a sponge pad is adhered inside the arc-shaped grooves.

4. The biosafety cabinet convenient to access according to claim 1, wherein the circulating disinfection device (4) comprises a disinfection box (41), one end of the outer wall of the disinfection box (41) is fixedly connected with a fan (42), the air inlet of the fan (42) sequentially penetrates through the tops of the outer shell (1) and the inner shell (21), one end of the inner cavity of the disinfection box (41), which is close to the air outlet of the fan (42), is fixedly connected with three baffles (43), the inner cavity of the disinfection box (41) is in threaded connection with an ultraviolet lamp (44) between the two baffles (43), one end of the inner cavity of the disinfection box (41), which is far away from the fan (42), is fixedly connected with two layers of filter screens (45), the bottom of each filter screen (45) is fixedly connected with a fan (46), one end of the bottom of the outer wall of the disinfection box (41), which is close to the fan (46), is fixedly connected with an exhaust pipeline (47), the discharge pipeline (47) penetrates through one end of the top of the outer shell (1) and is fixedly connected to the bottom of the inner shell (21).

5. The biosafety cabinet convenient to access according to claim 1, wherein the closing box (51) is fixedly connected to the movable door (23), an opening (52) is formed in one end, close to the inner shell (21), of the inside of the closing box (51), a second electric push rod (53) is fixedly connected to the top of the closing box (51), the second electric push rod (53) is fixedly connected to the movable door (23), an expansion rod (54) is fixedly connected to an output end of the second electric push rod (53), a sealing plate (55) is fixedly connected to one end, far away from the second electric push rod (53), of the expansion rod (54) of the sealing plate (55) is slidably connected to the inside of the closing box (51), and two sealing covers (56) are in threaded connection with one end, far away from the outer shell (1), of the closing box (51).

6. The biosafety cabinet convenient to access according to claim 1, wherein the clamping device (6) comprises a hydraulic rod (61), the hydraulic rod (61) is located inside the closed box (51), an output rod (62) is fixedly connected to an output end of the hydraulic rod (61), a fixed slide rail (63) is fixedly connected to one end, away from the hydraulic rod (61), of the output rod (62), a motor (64) is fixedly connected to one end of the outer wall of the fixed slide rail (63), a bidirectional threaded rod is connected to an output end of the motor (64) through one end of the fixed slide rail (63), the motor (64) is connected with two clamping blocks (65) through the bidirectional threaded rod in a threaded manner, and the two clamping blocks (65) are symmetrical to each other on the bidirectional threaded rod.

7. The biosafety cabinet convenient to access according to claim 1, wherein the air suction device (7) comprises an air suction box (71), the air suction box (71) is fixedly connected to the movable door (23), an air pump (72) is fixedly connected to the inside of the air suction box (71), one end of the air pump (72) is fixedly connected with an air inlet pipe (73), one end, far away from the air inlet pipe (73), of the air pump (72) is fixedly connected with a discharge pipe (75), an adsorption barrel (74) is connected to the discharge pipe (75) in a threaded manner, and the air inlet pipe (73) and the discharge pipe (75) are both fixedly connected to the closed box (51).

8. The biosafety cabinet convenient to access according to claim 1, wherein the number of the fixed plates (31) is three, the three fixed plates (31) are uniformly clamped inside the inner shell (21), one end of the movable plate (32) far away from the inner wall of the inner shell (21) is hinged on the fixed plate (31), and the bottom of one end of the movable plate (32) close to the inner wall of the inner shell (21) is contacted with the output end of the first electric push rod (38).