MOFs adsorption type high-energy-efficiency device and method for extracting water from air

Abstract

The invention belongs to the technical field of water intaking, and relates to a MOFs adsorption type high-energy-efficiency air water intaking device and method.The MOFs adsorption type high-energy-efficiency air water intaking device comprises a base, a working cavity is fixedly connected to the middle of the base, a pipeline is fixedly connected to the middle of the working cavity, a protection box is fixedly connected to the end of the working cavity, a filtering cavity is formed in the end of the pipeline, and a supporting assembly is arranged at the bottom of the filtering cavity; a replacement assembly is arranged in the middle of the pipeline, the pipeline is placed on a plane through the base, then the filtering cavity filters air entering the working cavity, when the interior of the filtering cavity is blocked by dust and other impurities in the air, a signal can be transmitted to the supporting assembly, and then the supporting assembly can move away from the supporting effect on the filtering cavity; according to the water taking device, the filter cavity can fall into the protection box, then the filter cavity is replaced through the replacement assembly, the situation that dust and other impurities in the air enter the working cavity to affect the work of the working cavity can be reduced in the water taking process, and the work of the working cavity can be protected.

Description

Technical Field

[0001] The present invention belongs to the technical field of water extraction, and relates to a MOFs adsorption type high-energy-efficiency air water extraction device and method. Background Art

[0002] Water is an indispensable substance in the human body, accounting for a large proportion of human body weight and is a basic element that constitutes cells, tissues and organs. However, about 1 billion people around the world live in arid areas where the moisture content in the atmosphere is low.

[0003] In areas with low moisture content, water extraction devices can be used to adsorb water vapor in the atmosphere. This can then be combined with low-grade heat sources such as solar energy to achieve sustainable water production in a dry environment, providing a new way to solve water resource problems.

[0004] When the water intake device is in use, the outside air is relatively dry, and the content of impurities such as dust in the air is high. When the outside air is introduced into the water intake device, the internal filter will work for a long time and cause internal blockage. If it is not resolved in time, it will cause irreversible damage to the operation of the water intake device. Summary of the invention

[0005] The technical problem to be solved by the present invention is: when the water intake device is used, the outside air is relatively dry, and the content of impurities such as dust in the air is relatively high. When the outside air is introduced into the water intake device, the internal filter will work for a long time and cause internal blockage. If it is not solved in time, it will cause irreversible damage to the operation of the water intake device.

[0006] The present invention describes a MOFs adsorption-type high-energy-efficiency air water extraction device and method, which includes a base, a working chamber fixedly connected to the middle of the base, a pipe fixedly connected to the middle of the working chamber, a protection box fixedly connected to the end of the working chamber, a filter chamber provided at the end of the pipe, a support assembly provided at the bottom of the filter chamber, a replacement assembly provided in the middle of the pipe, and a filter plate rotatably connected to the inside of the filter chamber.

[0007] The support assembly includes an arc pad, a support rod, a round pad, a support rod, a hidden groove, a first spring, and an electric push rod. The middle part of the protection box is slidably connected to the support rod, the end of the support rod is slidably connected to the round pad, the middle part of the round pad is provided with a hidden groove, the middle part of the hidden groove is fixedly connected to the first spring, the middle part of the protection box is fixedly connected to the electric push rod, and the end of the electric push rod is fixedly connected to the support rod.

[0008] The replacement assembly includes a support block, a support slide rod, an arc-shaped connecting plate, a limiting groove, and a spare filter chamber. A support block is fixedly connected to the middle of the pipeline, a support slide rod is fixedly connected to the middle of the support block, an arc-shaped connecting plate is fixedly connected to the middle of the filter chamber, a limiting groove is fixedly connected to the middle of the arc-shaped connecting plate, the support slide rod is slidably connected to the limiting groove, and a spare filter chamber is fixedly connected to the middle of the arc-shaped connecting plate.

[0009] The end of the spare filter cavity is fixedly connected to a limiting plate, the middle of the pipeline is provided with an adhesion limiting groove, the middle of the protection box is fixedly connected to a hinge, and the middle of the hinge is hinged with a cover plate.

[0010] A slide groove is opened in the middle of the filter cavity, a plurality of groups of second springs are fixedly connected in the middle of the slide groove, a slide plate is fixedly connected to the end of the second spring, a wind shield plate is fixedly connected in the middle of the slide plate, a cleaning assembly is arranged at the bottom of the slide plate, a power assembly is arranged in the middle of the filter cavity, and a limit position assembly is arranged under the slide plate.

[0011] The cleaning assembly includes a connecting piece, a circular hoop, and a cleaning piece. The bottom of the slide is fixedly connected to the connecting piece, the middle of the filter plate is slidably connected to the circular hoop, the connecting piece is slidably connected to the circular hoop, the middle of the circular hoop is fixedly connected to multiple groups of cleaning pieces, and the cleaning piece is slidably connected to the filter plate.

[0012] The power assembly includes a motor cavity, an electric motor, a half gear, a gear ring, and a striking rod. The motor cavity is fixedly connected to the middle of the filter cavity, the electric motor is fixedly connected to the middle of the motor cavity, the half gear is fixedly connected to the output end of the motor, the gear ring is slidably connected to the middle of the filter cavity, the gear ring and the half gear are meshed with each other, the end of the gear ring is fixedly connected to the striking rod, and the striking rod is slidably connected to the wind shield.

[0013] The limiting assembly includes a fixing block, an elastic sheet, a pull rope, and a stop ball. The fixing block is hinged at the bottom of the connecting sheet, an elastic sheet is fixedly connected to the middle of the fixing block, the other end of the elastic sheet is fixedly connected to the connecting sheet, a pull rope is fixedly connected to the middle of the elastic sheet, the pull rope is slidably connected to the slide, and a stop ball is fixedly connected to the end of the pull rope.

[0014] A retaining ring is fixedly connected to the end of the filter cavity, and the retaining ring is fixedly connected to the filter plate. A circular ring is fixedly connected to the end of the filter cavity outside the retaining ring, and a clamping assembly is arranged in the middle of the circular ring.

[0015] The clamping assembly includes an insert, a pull rod, a pressure plate, and a third spring. The insert is slidably connected to the middle of the circular ring, and the end of the insert is slidably connected to the retaining ring. The insert is fixedly connected to the middle of the insert, and the end of the pull rod is hinged to a pressure plate. The middle of the pressure plate is fixedly connected to the third spring, and the end of the third spring is fixedly connected to the retaining ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: when water is needed, the base can be placed on a plane, and then the filter chamber can filter the air entering the working chamber; when the filter chamber is blocked by dust and other impurities in the air, a signal can be transmitted to the support assembly, and then the support assembly can remove the support for the filter chamber, so that the filter chamber can fall into the protective box, and then the filter chamber can be replaced by replacing the assembly, so that during the water extraction process, the dust and other impurities in the air can be reduced from entering the working chamber to affect its work, thereby protecting the work of the working chamber.

[0017] When the filter chamber is used for work, the outside wind can blow the wind shield, and then the slide plate can slide inside the slide groove, thereby driving the cleaning component to slide in the middle of the filter plate, and then the slide plate can be returned to its original position through the action of the second spring. When there is a lot of dust stuck in the middle of the filter plate, the wind shield plate can be pushed by the power component, thereby improving the cleaning efficiency of the dust stuck on the surface of the filter plate. The limit component can connect the cleaning component and the slide plate to reduce the occurrence of detachment during the cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a partial cross-sectional view of the present invention.

[0020] Figure 3 It is an enlarged schematic diagram of the filter cavity in the present invention.

[0021] Figure 4 It is a structural schematic diagram of the filter plate in the present invention.

[0022] Figure 5 The present invention Figure 3 Enlarged view of point A.

[0023] In the figure: 1, base; 2, working chamber; 3, pipeline; 4, protection box; 5, filter chamber; 6, arc pad; 7, support rod; 8, round pad; 9, support rod; 10, dark groove; 11, first spring; 12, electric push rod; 13, support block; 14, support slide rod; 15, arc connecting plate; 16, limit groove; 17, spare filter chamber; 18, limit groove; 19, limit plate; 20, hinge; 21, cover plate; 22, slide groove ; 23. Second spring; 24. Slide plate; 25. Wind shield; 26. Connecting plate; 27. Hoop; 28. Cleaning plate; 29. ​​Filter plate; 30. Retaining block; 31. Elastic sheet; 32. Pull rope; 33. Block ball; 34. Motor cavity; 35. Motor; 36. Half gear; 37. Gear ring; 38. Hit rod; 39. Ring; 40. Insert; 41. Pull rod; 42. Pressure plate; 43. Third spring; 44. Retaining ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] Example 1

[0028] like Figure 1-2 As shown, it includes a base 1, a working chamber 2 is fixedly connected to the middle of the base 1, a pipe 3 is fixedly connected to the middle of the working chamber 2, a protection box 4 is fixedly connected to the end of the working chamber 2, a filter chamber 5 is arranged at the end of the pipe 3, a support assembly is arranged at the bottom of the filter chamber 5, a replacement assembly is arranged in the middle of the pipe 3, and a filter plate 29 is rotatably connected inside the filter chamber 5.

[0029] When it is necessary to take water, the base 1 can be placed on a flat surface, and then the filter chamber 5 can filter the air entering the working chamber 2. When the filter chamber 5 is blocked by dust and other impurities in the air, a signal can be transmitted to the support component, and then the support component can remove the support effect on the filter chamber 5, so that the filter chamber 5 can fall into the protective box 4, and then the filter chamber 5 can be replaced by replacing the component, so that during the water taking process, the dust and other impurities in the air can be reduced from entering the working chamber 2 and affecting its work, and the work of the working chamber 2 can be protected.

[0030] The supporting assembly includes an arc pad 6, a supporting rod 7, a circular pad 8, a supporting rod 9, a hidden groove 10, a first spring 11, and an electric push rod 12. The middle part of the protection box 4 is slidably connected to the supporting rod 9, and the end of the support rod 9 is slidably connected to the circular pad 8. A hidden groove 10 is opened in the middle of the circular pad 8, and the middle part of the hidden groove 10 is fixedly connected to the first spring 11. The middle part of the protection box 4 is fixedly connected to the electric push rod 12, and the end of the electric push rod 12 is fixedly connected to the support rod 9.

[0031] When the filter chamber 5 is blocked by dust and other impurities in the air, a signal can be transmitted to the electric push rod 12, and then the electric push rod 12 will shrink, and then pull the support rod 9 to slide in the middle of the protection box 4. At this time, the round pad 8 will lose the supporting effect of the support rod 9 and then fall down, and then the filter chamber 5 in the middle of the arc pad 6 will follow and fall down. Before the round pad 8 contacts the bottom of the protection box 4, the first spring 11 inside the dark groove 10 can contact the bottom of the protection box 4 first, and then the filter chamber 5 in the middle of the arc pad 6 can be buffered. At this time, when the filter chamber 5 is blocked, the filter chamber 5 can be more conveniently removed from the end of the pipe 3, thereby reducing the situation where the normal operation of the working chamber 2 is affected by incomplete filtration, and the working chamber 2 can be protected.

[0032] The replacement assembly includes a support block 13, a support slide rod 14, an arc-shaped connecting plate 15, a limiting groove 16, and a spare filter chamber 17. The support block 13 is fixedly connected to the middle of the pipe 3, the support slide rod 14 is fixedly connected to the middle of the support block 13, the arc-shaped connecting plate 15 is fixedly connected to the middle of the filter chamber 5, the limiting groove 16 is fixedly connected to the middle of the arc-shaped connecting plate 15, the support slide rod 14 is slidably connected to the limiting groove 16, and the spare filter chamber 17 is fixedly connected to the middle of the arc-shaped connecting plate 15.

[0033] When the filter chamber 5 needs to be replaced, the support block 13 can support the support slide rod 14, so that the end of the support slide rod 14 can slide inside the limit groove 16, and then the arc-shaped connecting plate 15 can be limited and supported, and then the spare filter chamber 17 can be placed at the end of the pipe 3 to replace the filter chamber 5 to work, and then when the filter chamber 5 is blocked by dust and other impurities in the air, the spare filter chamber 17 can be used to replace the filter chamber 5 more quickly, so as to protect the working chamber 2 when it is working.

[0034] A limit plate 19 is fixedly connected to the end of the spare filter chamber 17 , an adhesive limit groove 18 is provided in the middle of the pipe 3 , a hinge 20 is fixedly connected to the middle of the protection box 4 , and a cover plate 21 is hingedly connected to the middle of the hinge 20 .

[0035] When the spare filter chamber 17 is used to replace the filter chamber 5, the limiting plate 19 can be dropped into the adhesion limiting groove 18, thereby limiting the position of the spare filter chamber 17 and reducing the movement of the spare filter chamber 17 at the end of the pipe 3. Then, the cover plate 21 can be rotated by the hinge 20, so that the filter chamber 5 can be taken out from the middle of the protective box 4, and then the dust inside the filter chamber 5 can be cleaned.

[0036] Example 2

[0037] like Figure 3-4 As shown, a slide groove 22 is opened in the middle of the filter chamber 5, a plurality of groups of second springs 23 are fixedly connected in the middle of the slide groove 22, a slide plate 24 is fixedly connected to the end of the second spring 23, a wind shield plate 25 is fixedly connected in the middle of the slide plate 24, a cleaning assembly is arranged at the bottom of the slide plate 24, a power assembly is arranged in the middle of the filter chamber 5, and a limit assembly is arranged below the slide plate 24.

[0038] When the filter chamber 5 is in use, the outside wind can blow the wind shield 25, and then the slide plate 24 can slide inside the slide groove 22, thereby driving the cleaning component to slide in the middle of the filter plate 29, and then the slide plate 24 can be returned to its original position through the action of the second spring 23. When there is a lot of dust stuck in the middle of the filter plate 29, the wind shield 25 can be pushed by the power component, thereby improving the cleaning efficiency of the dust stuck on the surface of the filter plate 29. The limiting component can connect the cleaning component and the slide plate 24 to reduce the occurrence of detachment during the cleaning process.

[0039] The cleaning assembly includes a connecting piece 26, a circular hoop 27, and a cleaning piece 28. The connecting piece 26 is fixedly connected to the bottom of the slide plate 24, and the circular hoop 27 is slidably connected to the middle of the filter plate 29. The connecting piece 26 is slidably connected to the circular hoop 27. Multiple groups of cleaning pieces 28 are fixedly connected to the middle of the circular hoop 27. The cleaning pieces 28 are slidably connected to the filter plate 29.

[0040] When the wind shield plate 25 moves in the middle of the filter chamber 5, it can drive the circular hoop 27 to slide inside the filter chamber 5, and then through the limiting component, the cleaning sheet 28 can reciprocate on the surface of the filter plate 29, and then the cleaning sheet 28 can be used to clean the dust and other impurities adhered to the surface of the filter plate 29, thereby improving the efficiency of atmospheric filtration.

[0041] The power assembly includes a motor cavity 34, an electric motor 35, a half gear 36, a gear ring 37, and a striking rod 38. The motor cavity 34 is fixedly connected to the middle of the filter cavity 5, the electric motor 35 is fixedly connected to the middle of the motor cavity 34, the half gear 36 is fixedly connected to the output end of the motor 35, the gear ring 37 is slidably connected to the middle of the filter cavity 5, the gear ring 37 and the half gear 36 are meshed with each other, the end of the gear ring 37 is fixedly connected to the striking rod 38, and the striking rod 38 is slidably connected to the wind shield 25.

[0042] When a lot of dust and other impurities are adhered and accumulated on the surface of the filter plate 29, the wind shield 25 can be put into operation, thereby driving the half gear 36 to rotate inside the circular hoop 27. Through the action of the half gear 36, the circular hoop 27 can reciprocate in the middle of the filter chamber 5, and then the wind shield 25 can be pushed by the striking rod 38. At this time, the cleaning efficiency of the dust adhered to the surface of the filter plate 29 can be improved.

[0043] The limiting assembly includes a fixing block 30, an elastic sheet 31, a pull rope 32, and a blocking ball 33. The fixing block 30 is hinged at the bottom of the connecting sheet 26, the elastic sheet 31 is fixedly connected to the middle of the fixing block 30, the other end of the elastic sheet 31 is fixedly connected to the connecting sheet 26, the pull rope 32 is fixedly connected to the middle of the elastic sheet 31, the pull rope 32 is slidably connected to the slide plate 24, and the blocking ball 33 is fixedly connected to the end of the pull rope 32.

[0044] When the connecting piece 26 is used to drive the round hoop 27 to move, the retaining block 30 can be used to fix the round hoop 27, and the elastic action of the elastic piece 31 can improve the fixing effect of the retaining block 30 on the round hoop 27, and reduce the occurrence of the round hoop 27 falling off from the middle of the retaining block 30. When the filter plate 29 needs to be inspected, the blocking ball 33 can be pulled, and then the round hoop 27 can be taken out from the middle of the retaining block 30 through the action of the pull rope 32.

[0045] Example 3

[0046] like Figure 3 to Figure 5 As shown, a retaining ring 44 is fixedly connected to the end of the filter cavity 5, and the retaining ring 44 is fixedly connected to the filter plate 29. A circular ring 39 is fixedly connected to the end of the filter cavity 5 outside the retaining ring 44, and a clamping assembly is arranged in the middle of the circular ring 39.

[0047] When the filter plate 29 inside the filter cavity 5 is stuck with a lot of dust and cannot work, the filter plate 29 can be taken out from the filter cavity 5 by the snap-fit ​​assembly. After the filter plate 29 is cleaned, the snap-fit ​​assembly can be used again to fix the filter plate 29.

[0048] The clamping assembly includes an insert 40, a pull rod 41, a pressure plate 42, and a third spring 43. The insert 40 is slidably connected to the middle of the ring 39, and the end of the insert 40 is slidably connected to the retaining ring 44. The pull rod 41 is fixedly connected to the middle of the insert 40, and the pressure plate 42 is hinged to the end of the pull rod 41. The third spring 43 is fixedly connected to the middle of the pressure plate 42, and the end of the third spring 43 is fixedly connected to the retaining ring 44.

[0049] When the filter plate 29 needs to be removed from the middle of the filter chamber 5, the pressing plate 42 can be pressed, and then the insertion piece 40 can slide inside the circular ring 39 through the transmission action of the pull rod 41, and then the insertion piece 40 is moved out from the middle of the retaining ring 44, and then the filter plate 29 can be taken out from the filter chamber 5. When the filter plate 29 is placed inside the filter chamber 5, the pressing plate 42 can be squeezed by the third spring 43, and the retaining ring 44 and the circular ring 39 can be fixed by the insertion piece 40.

[0050] The description of the direction and relative position relationship of the structure in the present invention, such as the description of front, back, left, right, up, and down, does not constitute a limitation of the present invention, but is only for the convenience of description.

Claims

1. A MOFs adsorption type high energy efficiency air water extraction device and method, characterized in that: The invention comprises a base (1), a working chamber (2) is fixedly connected to the middle of the base (1), a pipe (3) is fixedly connected to the middle of the working chamber (2), a protection box (4) is fixedly connected to the end of the working chamber (2), a filter chamber (5) is arranged at the end of the pipe (3), a support assembly is arranged at the bottom of the filter chamber (5), a replacement assembly is arranged in the middle of the pipe (3), and a filter plate (29) is rotatably connected to the inside of the filter chamber (5).

2. A MOFs adsorption type high energy efficiency air water extraction device and method according to claim 1, characterized in that: The support assembly comprises an arc pad (6), a support rod (7), a circular pad (8), a support rod (9), a dark groove (10), a first spring (11), and an electric push rod (12); the middle of the protection box (4) is slidably connected to the support rod (9); the end of the support rod (9) is slidably connected to the circular pad (8); the middle of the circular pad (8) is provided with a dark groove (10); the middle of the dark groove (10) is fixedly connected to the first spring (11); the middle of the protection box (4) is fixedly connected to the electric push rod (12); the end of the electric push rod (12) is fixedly connected to the support rod (9).

3. A MOFs adsorption type high energy efficiency air water extraction device and method according to claim 2, characterized in that: The replacement assembly comprises a support block (13), a support slide bar (14), an arc-shaped connecting plate (15), a limiting groove (16), and a spare filter chamber (17); the support block (13) is fixedly connected to the middle of the pipeline (3); the support slide bar (14) is fixedly connected to the middle of the support block (13); the arc-shaped connecting plate (15) is fixedly connected to the middle of the filter chamber (5); the limiting groove (16) is fixedly connected to the middle of the arc-shaped connecting plate (15); the support slide bar (14) is slidably connected to the limiting groove (16); and the spare filter chamber (17) is fixedly connected to the middle of the arc-shaped connecting plate (15).

4. A MOFs adsorption type high energy efficiency air water extraction device and method according to claim 3, characterized in that: The end of the spare filter chamber (17) is fixedly connected to a limit plate (19), the middle of the pipe (3) is provided with an adhesive limit groove (18), the middle of the protection box (4) is fixedly connected to a hinge (20), and the middle of the hinge (20) is hinged with a cover plate (21).

5. A MOFs adsorption type high energy efficiency air water extraction device and method according to claim 1, characterized in that: A slide groove (22) is provided in the middle of the filter cavity (5), a plurality of groups of second springs (23) are fixedly connected in the middle of the slide groove (22), a slide plate (24) is fixedly connected to the end of the second spring (23), a wind shield (25) is fixedly connected in the middle of the slide plate (24), a cleaning component is provided at the bottom of the slide plate (24), a power component is provided in the middle of the filter cavity (5), and a limit position component is provided below the slide plate (24).

6. A MOFs adsorption type high energy efficiency air water extraction device and method according to claim 5, characterized in that: The cleaning assembly comprises a connecting piece (26), a circular hoop (27), and a cleaning piece (28); the bottom of the slide plate (24) is fixedly connected with the connecting piece (26); the middle of the filter plate (29) is slidably connected with the circular hoop (27); the connecting piece (26) and the circular hoop (27) are slidably connected; the middle of the circular hoop (27) is fixedly connected with a plurality of groups of cleaning pieces (28); the cleaning pieces (28) and the filter plate (29) are slidably connected.

7. A MOFs adsorption type high energy efficiency air water extraction device and method according to claim 5, characterized in that: The power assembly comprises a motor cavity (34), an electric motor (35), a half gear (36), a gear ring (37), and a striking rod (38); the motor cavity (34) is fixedly connected to the middle of the filter cavity (5); the electric motor (35) is fixedly connected to the middle of the motor cavity (34); the output end of the electric motor (35) is fixedly connected to the half gear (36); the middle of the filter cavity (5) is slidably connected to the gear ring (37); the gear ring (37) and the half gear (36) are meshed with each other; the end of the gear ring (37) is fixedly connected to the striking rod (38); the striking rod (38) is slidably connected to the windshield (25).

8. A MOFs adsorption type high energy efficiency air water extraction device and method according to claim 6, characterized in that: The limiting assembly comprises a fixing block (30), an elastic sheet (31), a pull rope (32), and a blocking ball (33); the fixing block (30) is hinged at the bottom of the connecting sheet (26); the middle of the fixing block (30) is fixedly connected to the elastic sheet (31); the other end of the elastic sheet (31) is fixedly connected to the connecting sheet (26); the middle of the elastic sheet (31) is fixedly connected to the pull rope (32); the pull rope (32) is slidably connected to the slide plate (24); and the end of the pull rope (32) is fixedly connected to the blocking ball (33).

9. A MOFs adsorption type high energy efficiency air water extraction device and method according to claim 1, characterized in that: A retaining ring (44) is fixedly connected to the end of the filter cavity (5), and the retaining ring (44) is fixedly connected to the filter plate (29). A circular ring (39) is fixedly connected to the end of the filter cavity (5) outside the retaining ring (44), and a clamping assembly is arranged in the middle of the circular ring (39).

10. A MOFs adsorption type high energy efficiency air water extraction device and method according to claim 9, characterized in that: The clamping assembly includes an insert (40), a pull rod (41), a pressure plate (42), and a third spring (43); the insert (40) is slidably connected to the middle of the circular ring (39); the end of the insert (40) is slidably connected to a retaining ring (44); the middle of the insert (40) is fixedly connected to a pull rod (41); the end of the pull rod (41) is hingedly connected to a pressure plate (42); the middle of the pressure plate (42) is fixedly connected to a third spring (43); and the end of the third spring (43) is fixedly connected to the retaining ring (44).

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