Rapid atomization foaming reaction equipment for bio-based polyurethane thermal insulation foam

Abstract

The rapid atomization foaming reaction equipment specifically comprises a base, a foaming device is fixedly connected to the bottom of the base, a circular plate is fixedly connected to the bottom of the foaming device, a sleeve is fixedly installed at the axis of the bottom of the circular plate, a center column is fixedly connected to the axis of the bottom of the sleeve, and a foaming device is fixedly connected to the center of the center column. The end, away from the sleeve, of the center column is fixedly connected with an enveloping shell. According to the quick atomizing and foaming reaction equipment for the bio-based polyurethane heat insulation foam, a thin rod is linked with a rotating block for treatment, an attaching seat plays a certain fixing effect, a wiping strip moves the outer surface of a spray head, the wiping strip gradually shifts along with the outer surface of the spray head, and compared with the prior art, the step of wiping the foam filling position is completed through the wiping strip, so that the operation is simple, and the efficiency is high. The foam filling the gap is more uniformly and neatly smeared, the situation that the foam is smeared too much or too little is not prone to occurring, and the purpose of improving the machining quality is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of atomization foaming, in particular to a rapid atomization foaming reaction device for bio-based polyurethane thermal insulation foam. Background Art

[0002] The main components of polyurethane foam are isocyanate and polyether. Under the action of some chemical substances, these raw materials are mixed using some special equipment, and then foamed on-site by spraying at a higher pressure. The resulting substance is polyurethane foam. Polyurethane foam has two types: hard foam and soft foam. Hard polyurethane foam is a newly developed category. It has the functions of heat preservation and waterproofing, and its thermal conductivity is relatively poor, but its thermal insulation ability is excellent.

[0003] In the prior art, when the polyurethane material is sprayed from an aerosol can, the foamy polyurethane material will expand rapidly, and react with the air or moisture in the contacted group to form foam, and then fill the place where foaming is required. The defect of the above-mentioned prior art is that unevenness is prone to occur during the spraying and coating process, and it is difficult to control the composition of the polyurethane material, resulting in waste of polyurethane foam. Summary of the invention

[0004] In view of the deficiencies of the prior art, the technical solution adopted by the present invention to solve the technical problems is: A rapid atomization foaming reaction device for bio-based polyurethane thermal insulation foam, specifically comprising: A base, the bottom of which is fixedly connected with a foaming device. Through the setting of the foaming device, the interior has a certain foaming function, which improves the use effect of material foaming processing, realizes the function of quickly wiping and processing materials, and reduces the waste of foaming processing materials. A circular plate is fixedly connected to the bottom of the foaming device, a sleeve is fixedly installed at the axis of the bottom of the circular plate, a center column is fixedly connected to the axis of the bottom of the sleeve, an end of the center column away from the sleeve is fixedly connected to an envelope shell, and a center shaft body is movably connected to the left side of the envelope shell; The central axis body has an extrusion block fixedly installed on the left end of the central axis body. Through the setting of the uniform device, the foam filling gap is more evenly and neatly applied, and it is not easy to apply too much or too little, so as to achieve the purpose of improving the processing quality. The right end of the central axis body is fixedly connected with a nozzle, and an atomizing device is movably installed on the left side of the bottom of the envelope shell. Through the setting of the atomizing device, the equipment has the function of automatic foaming, which can foam the gaps and other places, so as to achieve the purpose of quickly obtaining the foam processing operation. The atomizing device has a limiting block on the outside, The atomizing device comprises: The lower leveling device has a round bar fixedly connected to the middle of the top of the leveling device, a square plate fixedly connected to the top of the leveling device, a spring fixedly installed in the middle of the top of the square plate, and a stabilizing block fixedly connected to the top of the spring. Furthermore, the central axis penetrates the envelope shell and extends to the nozzle, a groove is provided at the location of the central axis inside the stabilizing block, and the extrusion block and the atomizing device are both designed in an arc shape.

[0005] Furthermore, the interior of the stabilizing block is hollow, and an envelope shell is movably connected to the outer surface of the stabilizing block, and the circular bar is connected to the spring through a square plate. The uniform device also includes a main cavity part, and a placement block is fixedly connected to the front of the main cavity part, and an arc strip is fixedly installed in the middle of the right side of the placement block, and a thin rod is fixedly connected to the side of the arc strip away from the main cavity part, and a fitting seat is slidably connected to the outer surface of the thin rod, and a limiting seat is fixedly connected to the right end of the thin rod, and a rotating block is slidably connected to the inner cavity of the limiting seat, and a wiping strip is fixedly installed on the right side of the rotating block. The rotating block deviates along the inside of the limiting seat, and the wiping strip is driven to move when the rotating block deviates, and the rotating block gradually assists in adjusting the size of the nozzle, and a groove body adapted to the diameter of the thin rod is provided inside the limiting seat, and a processing head is provided on the inner surface of the wiping strip, and the width of the wiping strip is wider than the width of the rotating block, and adhesive glue is coated between the fitting seat and the central axis body, and the thin rod passes through the interior of the fitting seat and the limiting seat, and a sliding groove corresponding to the rotating block is provided in the middle of the limiting seat.

[0006] Furthermore, the foaming device includes an outer shell, the top wall of the outer shell is movably connected to a central axis, the outer surface of the central axis is fixedly connected to a sleeve block, the outer surface of the sleeve block is fixedly connected to a toggle piece, the top of the circular plate is fixedly connected to a support plate, the support plate is symmetrically designed with reference to the central axis of the central axis, there are two sleeve blocks, and the sleeve blocks are made of metal, a groove corresponding to the central axis is opened on the top of the support plate, the toggle piece moves the adjustment plate downward through the support plate, when the adjustment plate moves downward, it is affected by the height difference and deforms, the adjustment plate swings outward, the central axes of the outer shell and the central axis are in the same straight line, the toggle pieces are evenly distributed with reference to the center line of the sleeve block, and the outer surface of the central axis is movably connected to the support plate.

[0007] The present invention provides a rapid atomization foaming reaction device for bio-based polyurethane thermal insulation foam, which has the following beneficial effects: 1. The rapid atomization foaming reaction equipment of the bio-based polyurethane insulation foam is prepared by adding the material of the polyurethane component into the foaming device in advance, and gradually bringing the atomization device and the extrusion block closer by applying force by hand. The atomization device contacts the foaming device through the central column, thereby enabling the equipment to have the basic conditions of automatic rapid atomization, which is a good condition for the foaming reaction.

[0008] 2. The rapid atomization foaming reaction equipment of the bio-based polyurethane insulation foam is displaced downward by a spring. The interior of the stabilizing block is hollow. The spring pulls the central axis to move downward through the stabilizing block. The material inside the central axis flows downward through the central column. The central axis acts on the sleeve block to move downward synchronously. A displacement difference is generated inside the sleeve block when it moves downward. The smaller the area, the greater the pressure. The pressure causes the foaming material to pass through the central column and then into the envelope shell. It is guided by the central axis and finally sprayed out through the nozzle, so that the equipment has the function of automatic foaming and can foam gaps, etc., to achieve the purpose of rapid foam processing operation.

[0009] 3. The rapid atomization foaming reaction equipment of the bio-based polyurethane insulation foam is deformed by the height difference when the adjustment plate moves downward, and the adjustment plate swings outward, and the adjustment plate gradually collides with the inner wall of the foaming device. The inner wall of the foaming device vibrates due to the impact, and the foaming device shakes due to the vibration. The foaming material adhered to the inner wall of the foaming device gradually flows downward. Compared with the existing technology, the equipment has the function of automatically improving the material utilization rate, improving the material foaming processing effect, realizing the function of quickly wiping the material, and reducing the waste of foaming processing materials.

[0010] 4. The rapid atomization foaming reaction equipment of the bio-based polyurethane insulation foam is linked to the rotating shaft through the stand. When the rotating shaft shakes, the wiping strip tilts, and the wiping strip gradually processes the inside. The wiping strip tilts and rotates to a certain extent. The wiping strip evenly stirs the material inside the equipment. Compared with the existing technology, the equipment has the effect of automatic processing, so that the equipment has the purpose of automatic processing, realizes the function of rapid and uniform stirring processing, and provides a certain foundation for the uniformity of the material.

[0011] 5. The rapid atomization foaming reaction equipment of the bio-based polyurethane insulation foam is processed by a thin rod-linked rotating block. The fitting seat has a certain fixing effect. The rotating block is offset along the inside of the limiting seat. When the rotating block is offset, the wiping strip is driven to move. The rotating block gradually assists in adjusting the size of the nozzle to prevent too much material from being sprayed at the nozzle. The wiping strip moves the outer surface of the nozzle, and the wiping strip gradually shifts accordingly. Compared with the existing technology, the step of wiping the foam filling area is then completed by the wiping strip, which improves the foam coating at the filling gap to be more uniform and neat, and is less likely to be coated too much or too little, thereby achieving the purpose of improving the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2It is a structural schematic diagram of the support plate of the present invention; Figure 3 It is a structural schematic diagram of the set block of the present invention; Figure 4 For the present invention Figure 2 A partial enlarged schematic diagram of the structure of the adjustment board at center A; Figure 5 It is a structural schematic diagram of the stand of the present invention; Figure 6 It is a schematic diagram of the structure of the circular strip of the present invention; Figure 7 It is a schematic diagram of the structure of the thin rod of the present invention; Figure 8 It is a schematic structural diagram of the wiping strip of the present invention.

[0013] In the figure: 1, base; 2, foaming device; 3, circular plate; 4, sleeve; 5, central column; 6, envelope shell; 7, atomizing device; 8, central axis; 9, extrusion block; 10, nozzle; 21, outer shell; 22, central axis; 23, sleeve block; 24, toggle member; 25, support plate; 26, adjustment plate; 27, stand; 28, rotating shaft; 29, wiping strip; 71, uniform device; 72, circular strip; 73, square plate; 74, spring; 75, stabilizing block; 711, main cavity; 712, placement block; 713, arc strip; 714, fitting seat; 715, thin rod; 716, limiting seat; 717, rotating block; 718, wiping strip. Implementation

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses. Example

[0015] See also Figure 1-Figure 5 The present invention provides a technical solution: a rapid atomization foaming reaction device for bio-based polyurethane insulation foam, specifically comprising: A base 1, a foaming device 2 is fixedly connected to the bottom of the base 1. Through the setting of the foaming device 2, a certain foaming function is enabled inside, the foaming processing effect of the material is improved, the function of quickly wiping the material is realized, and the waste of the foaming material is reduced. A circular plate 3 is fixedly connected to the bottom of the foaming device 2, a sleeve 4 is fixedly installed at the axis of the bottom of the circular plate 3, a center column 5 is fixedly connected to the axis of the bottom of the sleeve 4, an end of the center column 5 away from the sleeve 4 is fixedly connected to an envelope shell 6, and a center shaft body 8 is movably connected to the left side of the envelope shell 6; The foaming device 2 includes an outer shell 21, and the inner top wall of the outer shell 21 is movably connected to a central axis 22, a sleeve block 23 is fixedly connected to the outer surface of the central axis 22, a toggle member 24 is fixedly connected to the outer surface of the sleeve block 23, and a support plate 25 is fixedly connected to the top of the circular plate 3. The support plate 25 is symmetrically designed with the central axis of the central axis 22 as a reference. There are two sleeve blocks 23, and the sleeve blocks 23 are made of metal. A groove corresponding to the central axis 22 is opened on the top of the support plate 25. The toggle member 24 moves the adjustment plate 26 downward through the support plate 25. When the adjustment plate 26 moves downward, it is affected by the height difference and deforms. The adjustment plate 26 swings outward. The central axes of the outer shell 21 and the central axis 22 are on the same straight line. The toggle members 24 are evenly distributed with reference to the center line of the sleeve block 23, and the outer surface of the central axis 22 is movably connected to the support plate 25.

[0016] When in use, first check the installation and safety protection of the present invention, start the servo motor, add the material with polyurethane component in advance into the foaming device 2, use the force of the hand to gradually bring the atomizing device 7 and the extrusion block 9 closer together, and the atomizing device 7 contacts the foaming device 2 through the central column 5, so that the equipment has the basic conditions for automatic and rapid atomization, which is a good condition for the foaming reaction.

[0017] When rapid foaming is required, the main cavity 711 in the atomizing device 7 gradually moves toward the extrusion block 9, and the main cavity 711 drags the spring 74 to move through the circular bar 72, and the spring 74 moves downward. The interior of the stabilizing block 75 is hollow, and the spring 74 pulls the central axis 22 to move downward through the stabilizing block 75. The material inside the central axis 22 flows downward through the central column 5, and the central axis 22 acts on the sleeve block 23 to move downward synchronously. The sleeve block 23 moves downward and generates a displacement difference inside. The smaller the area, the greater the pressure, and the high and low pressure differences are generated. The pressure causes the foaming material to pass through the central column 5 and then to the envelope shell 6, and is guided by the central axis body 8, and finally sprayed out through the nozzle 10, so that the equipment has the function of automatic foaming, and has the function of foaming at gaps, etc., so as to achieve the purpose of rapid foaming processing operation.

[0018] When it is necessary to wipe and clean the inner wall of the foamed material, the central shaft 22 pushes the sleeve block 23 to move downward, the sleeve block 23 drives the toggle member 24 to operate, and the toggle member 24 toggle the adjustment plate 26 downward through the support plate 25 to operate. When the adjustment plate 26 moves downward, it is affected by the height difference and deformed, and the adjustment plate 26 swings outward, and the adjustment plate 26 gradually collides with the inner wall of the foaming device 2. The inner wall of the foaming device 2 vibrates due to the impact, and the foaming device 2 shakes due to the vibration. The foaming material adhered to the inner wall of the foaming device 2 gradually flows downward. Compared with the existing technology, the equipment has the function of automatically improving the material utilization rate, improving the material foaming processing effect, realizing the function of quickly wiping and processing materials, and reducing the waste of foaming processing materials.

[0019] When it is necessary to evenly stir the internal material, the adjustment plate 26 swings slightly due to the height difference, and the adjustment plate 26 drives the stand 27 to operate, and the stand 27 is linked to the rotating shaft 28. When the rotating shaft 28 shakes, the wiping strip 29 tilts, and the wiping strip 29 gradually processes the inside. The wiping strip 29 tilts and rotates to a certain extent, and the wiping strip 29 evenly stirs the material inside the equipment. Compared with the existing technology, the equipment has the effect of automatic processing, so that the equipment has the purpose of automatic processing, realizes the function of fast and uniform stirring, and provides a certain foundation for the uniformity of the material. Example

[0020] See also Figure 1-Figure 8 , the present invention provides a technical solution: on the basis of embodiment 1, The central axis 8 has an extrusion block 9 fixedly mounted on the left end thereof. The uniform device 71 is provided to improve the uniformity and neatness of the foam applied to the gaps, and it is not easy to apply too much or too little, so as to improve the processing quality. The right end of the central axis 8 is fixedly connected to a nozzle 10, and an atomizing device 7 is movably mounted on the left side of the bottom of the envelope shell 6. The atomizing device 7 is provided to enable the equipment to have an automatic foaming function, and has the function of foaming the gaps, etc., so as to achieve the purpose of quickly obtaining the foaming operation. The atomizing device 7 has a limiting block on the outside, The atomizing device 7 comprises: The lower leveling device 71 has a circular bar 72 fixedly connected to the middle of the top of the leveling device 71, a square plate 73 fixedly connected to the top of the leveling device 71, a spring 74 fixedly installed in the middle of the top of the square plate 73, and a stabilizing block 75 fixedly connected to the top of the spring 74. The central axis 8 penetrates the envelope shell 6 and extends to the nozzle 10. The central axis 8 is provided with a groove at the location inside the stabilizing block 75. The extrusion block 9 and the atomizing device 7 are both designed in an arc shape.

[0021] The interior of the stabilizing block 75 is hollow, and the outer surface of the stabilizing block 75 is movably connected to the envelope shell 6. The circular bar 72 is connected to the spring 74 through the square plate 73. The uniform device 71 also includes a main cavity 711. The front of the main cavity 711 is fixedly connected to a placement block 712. An arc-shaped bar 713 is fixedly installed in the middle of the right side of the placement block 712. The arc-shaped bar 713 is fixedly connected to a thin rod 715 on the side away from the main cavity 711. The outer surface of the thin rod 715 is slidably connected to a fitting seat 714. The right end of the thin rod 715 is fixedly connected to a limiting seat 716. The inner cavity of the limiting seat 716 is slidably connected to a rotating block 717. The right side of the rotating block 717 is fixed A wiping strip 718 is installed, and the rotating block 717 is offset along the inside of the limiting seat 716. When the rotating block 717 is offset, the wiping strip 718 is driven to move, and the rotating block 717 gradually assists in adjusting the size of the nozzle. A groove body adapted to the diameter of the thin rod 715 is opened inside the limiting seat 716. The inner surface of the wiping strip 718 has a processing head, and the width of the wiping strip 718 is wider than the width of the rotating block 717. Adhesive glue is coated between the fitting seat 714 and the central axis 8. The thin rod 715 passes through the interior of the fitting seat 714 and the limiting seat 716, and a sliding groove corresponding to the rotating block 717 is opened in the middle of the limiting seat 716.

[0022] When in use, first check the installation and safety protection of the present invention, start the servo motor, add the material with polyurethane component in advance into the foaming device 2, use the force of the hand to gradually bring the atomizing device 7 and the extrusion block 9 closer together, and the atomizing device 7 contacts the foaming device 2 through the central column 5, so that the equipment has the basic conditions for automatic and rapid atomization, which is a good condition for the foaming reaction.

[0023] When rapid foaming is required, the main cavity 711 in the atomizing device 7 gradually moves toward the extrusion block 9, and the main cavity 711 drags the spring 74 to move through the circular bar 72, and the spring 74 moves downward. The interior of the stabilizing block 75 is hollow, and the spring 74 pulls the central axis 22 to move downward through the stabilizing block 75. The material inside the central axis 22 flows downward through the central column 5, and the central axis 22 acts on the sleeve block 23 to move downward synchronously. The sleeve block 23 moves downward and generates a displacement difference inside. The smaller the area, the greater the pressure, and the high and low pressure differences are generated. The pressure causes the foaming material to pass through the central column 5 and then to the envelope shell 6, and is guided by the central axis body 8, and finally sprayed out through the nozzle 10, so that the equipment has the function of automatic foaming, and has the function of foaming at gaps, etc., so as to achieve the purpose of rapid foaming processing operation.

[0024] When uneven foam appears during application at the nozzle and needs to be processed, when the uniform device 71 approaches the extrusion block 9, the main cavity 711 in the uniform device 71 drives the placement block 712 to move, and the arc strip 713 is affected by the main cavity 711 and synchronously displaced, and the arc strip 713 drags the thin rod 715, and the thin rod 715 is linked to the rotating block 717 for processing, and the fitting seat 714 has a certain fixing effect, and the rotating block 717 is offset along the inside of the limiting seat 716. When the rotating block 717 is offset, it drives the wiping strip 718 to displace, and the rotating block 717 gradually assists in adjusting the size of the nozzle to prevent too much material from being sprayed at the nozzle. The wiping strip 718 displaces the outer surface of the nozzle 10, and the wiping strip 718 gradually deviates accordingly. Compared with the prior art, the step of wiping the foam filling is then completed by the wiping strip 718, which improves the uniformity and neatness of the foam application at the filling gap, and is less likely to be applied too much or too little, thereby achieving the purpose of improving the processing quality.

[0025] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A rapid atomization foaming reaction device for bio-based polyurethane insulation foam, specifically comprising: A base (1), wherein a foaming device (2) is fixedly connected to the bottom of the base (1), a circular plate (3) is fixedly connected to the bottom of the foaming device (2), a sleeve (4) is fixedly installed at the axis center of the bottom of the circular plate (3), a center column (5) is fixedly connected to the axis center of the bottom of the sleeve (4), an end of the center column (5) away from the sleeve (4) is fixedly connected to an envelope shell (6), and a center shaft (8) is movably connected to the left side of the envelope shell (6); A central axis (8), a squeezing block (9) is fixedly mounted on the left end of the central axis (8), a nozzle (10) is fixedly connected to the right end of the central axis (8), an atomizing device (7) is movably mounted on the left side of the bottom of the envelope shell (6), and the atomizing device (7) has a limiting block on the outside, characterized in that: The atomizing device (7) comprises: A lower leveling device (71) is provided, wherein a circular bar (72) is fixedly connected to the middle of the top of the leveling device (71), a square plate (73) is fixedly connected above the leveling device (71), a spring (74) is fixedly installed in the middle of the top of the square plate (73), and a stabilizing block (75) is fixedly connected to the top of the spring (74).

2. The rapid atomization foaming reaction equipment of a bio-based polyurethane thermal insulation foam according to claim 1, characterized in that: The central axis (8) passes through the envelope shell (6) and extends to the nozzle (10). A groove is provided at the location of the central axis (8) inside the stabilizing block (75). The extrusion block (9) and the atomizing device (7) are both designed in an arc shape.

3. The rapid atomization foaming reaction equipment of a bio-based polyurethane insulation foam according to claim 1, characterized in that: The interior of the stabilizing block (75) is hollow, and the outer surface of the stabilizing block (75) is movably connected to an envelope shell (6), and the circular bar (72) is connected to the spring (74) via a square plate (73).

4. The rapid atomization foaming reaction equipment of a bio-based polyurethane thermal insulation foam according to claim 1, characterized in that: The uniformizing device (71) further comprises a main cavity (711), the front face of the main cavity (711) being fixedly connected to a placement block (712), a curved strip (713) being fixedly mounted on the middle portion of the right side of the placement block (712), a thin rod (715) being fixedly mounted on a side of the curved strip (713) away from the main cavity (711), a fitting seat (714) being slidably mounted on the outer surface of the thin rod (715), a limiting seat (716) being fixedly mounted on the right end of the thin rod (715), a rotating block (717) being slidably mounted on the inner cavity of the limiting seat (716), and a wiping strip (718) being fixedly mounted on the right side of the rotating block (717).

5. The rapid atomization foaming reaction equipment of a bio-based polyurethane thermal insulation foam according to claim 4, characterized in that: A groove body matching the diameter of the thin rod (715) is provided inside the limiting seat (716); an inner surface of the wiping strip (718) has a processing head, and the width of the wiping strip (718) is wider than the width of the rotating block (717).

6. The rapid atomization foaming reaction equipment of a bio-based polyurethane thermal insulation foam according to claim 4, characterized in that: An adhesive is coated between the fitting seat (714) and the central axis (8), the thin rod (715) passes through the fitting seat (714) and the limiting seat (716), and a sliding groove corresponding to the rotating block (717) is provided in the middle of the limiting seat (716).

7. The rapid atomization foaming reaction equipment of a bio-based polyurethane thermal insulation foam according to claim 1, characterized in that: The foaming device (2) comprises an outer shell (21), the inner top wall of the outer shell (21) is movably connected to a central shaft (22), the outer surface of the central shaft (22) is fixedly connected to a sleeve block (23), the outer surface of the sleeve block (23) is fixedly connected to a toggle member (24), the top of the circular plate (3) is fixedly connected to a support plate (25), the bottom of the support plate (25) and a side away from the toggle member (24) is fixedly connected to an adjustment plate (26), the outer surface of the adjustment plate (26) is fixedly connected to a stand (27), the interior of the stand (27) is movably connected to a rotating shaft (28), and the outer surface of the rotating shaft (28) is fixedly connected to a wiping strip (29).

8. The rapid atomization foaming reaction equipment of bio-based polyurethane thermal insulation foam according to claim 7, characterized in that: The support plate (25) is symmetrically designed with the central axis of the central shaft (22) as a reference, and there are two sleeve blocks (23) in total, and the sleeve blocks (23) are made of metal.

9. The rapid atomization foaming reaction equipment of a bio-based polyurethane thermal insulation foam according to claim 7, characterized in that: The top of the support plate (25) is provided with a groove corresponding to the central shaft (22); the central axes of the outer shell (21) and the central shaft (22) are on the same straight line; the toggle members (24) are evenly distributed with reference to the central line of the sleeve block (23); and the outer surface of the central shaft (22) is movably connected to the support plate (25).

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