A post-pouring belt support structure

Abstract

The application discloses a post-poured belt supporting structure and relates to the technical field of building construction. The supporting structure comprises a main supporting frame and a horizontal supporting component. The horizontal supporting component comprises an intermediate supporting beam plate and two movable supporting beam plates. When the intermediate supporting beam plate and the movable supporting beam plates are in a horizontal state, the guide rods on the intermediate supporting beam plate and the guide rods on the movable supporting beam plates can form a guide rail. The supporting structure further comprises two auxiliary supporting frames. The two auxiliary supporting frames are arranged on the main supporting frame. The top of each auxiliary supporting frame is in sliding connection with the guide rods. The main supporting frame is provided with a spreading mechanism. The spreading mechanism can drive the two auxiliary supporting frames to move along the guide rods synchronously, and the moving directions of the two auxiliary supporting frames are opposite. The supporting structure is simple in structure. The two end portions of the horizontal supporting component can rotate and fold, so that the size of the whole structure is effectively reduced, and the installation and transportation are facilitated. The main supporting frame and the two auxiliary supporting frames can cooperate with each other to stably support the post-poured belt, and the supporting structure has high practicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a post-pouring belt supporting structure. BACKGROUND

[0002] The post-pouring belt is a temporary construction joint left in the corresponding position of the foundation slab, wall or beam in the building construction to prevent harmful cracks in the cast-in-place reinforced concrete structure due to temperature and uneven shrinkage, and the structure is temporarily divided into several parts according to the design or construction specification, and the structure is connected into a whole after pouring concrete in the construction joint after the shrinkage of the components.

[0003] The post-pouring belt needs to be supported by a supporting structure after construction, and the existing supporting method is to set a support frame along the length direction of the post-pouring belt, the support frame includes a plurality of vertical rods erected on the ground and a horizontal rod fixed between adjacent vertical rods, in order to ensure the supporting effect of the post-pouring belt, the vertical rods and the horizontal rods are arranged densely, so that the structure of the support frame is complex, and the disassembly and installation are more troublesome. SUMMARY

[0004] The purpose of the present application is to provide a post-pouring belt supporting structure to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A post-pouring belt supporting structure, comprising a main support frame and a horizontal support member, the horizontal support member comprises a middle support beam plate arranged at the top end of the main support frame and two movable support beam plates arranged at both ends of the middle support beam plate, the movable support beam plates are rotationally connected to the middle support beam plate through the connecting seats at the close ends; the bottom of the middle support beam plate and the movable support beam plate is provided with a guide rod, when the middle support beam plate and the movable support beam plate are in a horizontal state, the guide rods on the middle support beam plate and the movable support beam plate can form a guide rail, and the structure further comprises two auxiliary support frames, the two auxiliary support frames are arranged on both sides of the main support frame, the top of the auxiliary support frame is slidably connected to the guide rod, the main support frame is provided with a spreading mechanism, the spreading mechanism is connected to the two auxiliary support frames, and the spreading mechanism can drive the two auxiliary support frames to move synchronously along the guide rod and the moving direction of the two auxiliary support frames is opposite.

[0007] On the basis of the above technical scheme, the present application further provides the following optional technical scheme:

[0008] In an alternative solution, the auxiliary support frame comprises a support column, a sliding sleeve assembly and a pushing part, the lower end of the support column is provided with a rolling wheel assembly in rolling contact with the ground, the sliding sleeve assembly is arranged at the top end of the support column and can be slidably connected with the guide rod, and the pushing part is arranged at the top end of the support column and is located on the side away from the main support frame.

[0009] In an alternative solution, the pushing part comprises a pushing rod frame and a pushing roller, the pushing rod frame is arranged at the side of the support column, and the pushing roller is rotatably arranged at the end of the pushing rod frame away from the support column.

[0010] In an alternative solution, the bottom of the support column is provided with a lower mounting groove, and the rolling wheel assembly is mounted inside the lower mounting groove, the top wall of the lower mounting groove is provided with an inner extension groove, and a brake cylinder is mounted inside the inner extension groove, and the lower end of the brake cylinder is provided with a side part in sliding contact with the inner wall of the lower mounting groove.

[0011] In an alternative solution, the expansion mechanism comprises a driving part and two groups of push-pull parts, the driving part is arranged on the main support frame, and the two groups of push-pull parts are arranged on the two sides of the driving part respectively, each push-pull part comprises two mutually intersecting push-pull links, the middle parts of the two push-pull links are rotatably connected through a pin column, the end parts of the push-pull links are each provided with a fulcrum seat hinged thereto, the fulcrum seat close to the auxiliary support frame is in sliding contact with the auxiliary support frame, and the fulcrum seat close to the driving part is connected with the driving part, and the driving part drives the two push-pull links to rotate around the pin column by driving the fulcrum seat to move vertically.

[0012] In an alternative solution, the driving part comprises a vertical screw rod, a sliding seat and an expansion motor, the vertical screw rod is rotatably arranged inside the main support frame, the screw directions of the two end parts of the vertical screw rod are opposite, the output end of the expansion motor is connected with one end part of the vertical screw rod, the sliding seat is arranged at the two end parts of the vertical screw rod, and the fulcrum seat on the end part of the push-pull link is connected with the sliding seat.

[0013] In an alternative solution, the intermediate support beam plate and the movable support beam plate are both in the shape of a Chinese character "zh", the side parts of the intermediate support beam plate and the movable support beam plate are each provided with a plurality of linearly arranged suction disc assemblies, the top parts of the suction disc assemblies are flush with the upper surface of the intermediate support beam plate, and when the auxiliary support frame moves towards the end part of the movable support beam plate and passes through the suction disc assembly, the auxiliary support frame can drive the upper end part of the suction disc assembly to adsorb the wall surface.

[0014] In an alternative: the side of the vice support frame is provided with a rack part, the suction disc assembly comprises a negative pressure adsorption groove and an adjusting diaphragm, the negative pressure adsorption groove port faces upwards and the negative pressure adsorption groove arc bottom is fixed on the horizontal support member through a fixed cylinder, the adjusting diaphragm is arranged inside the negative pressure adsorption groove and the edge of the adjusting diaphragm is in sealing connection with the inner wall of the negative pressure adsorption groove, the adjusting diaphragm arc bottom is provided with an adjusting rotating rod, the negative pressure adsorption groove arc bottom is provided with a sleeve that is rotationally matched therewith, the adjusting rotating rod penetrates through the sleeve and is provided with a spiral part that is screwingly matched with the horizontal support member, and the end of the adjusting rotating rod located at the lower side of the horizontal support member is provided with a gear part that can be engaged with the rack part.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1、In the initial state of the support structure in the present application, the two vice support frames are close to the main support frame, and the two movable support beam plates are in a vertical state due to their own gravity, so that the overall support structure has a small size and is convenient to transport; when the support structure is installed, the middle support beam plate is placed on the post-cast strip and the main support frame serves as a support, and the spreading mechanism spreads the two vice support frames apart; when the vice support frame moves along the guide rod and moves to the connection between the middle support beam plate and the movable support beam plate, the vice support frame that continues to move can drive the movable support beam plate to rotate around the connection with the middle support beam plate, until the movable support beam plate is rotated to a horizontal state, and the movable support beam plate starts to support the corresponding part of the post-cast strip; when the movable support beam plate is in a horizontal state, the guide rod on the top of the vice support frame and the movable support beam plate starts to slide, and the vice support frame that continues to move starts to support the corresponding movable support beam plate, so that the main support frame and the two vice support frames can cooperate with each other to stably support the post-cast strip;

[0017] 2、The present application has a simple structure, the two ends of the horizontal support member can rotate and fold, thereby effectively reducing the size of the overall structure and facilitating installation and transportation, and the main support frame and the two vice support frames can cooperate with each other to stably support the post-cast strip, and the present application has strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the support structure in an embodiment of the present application.

[0019] Figure 2 It is a schematic diagram of the structure of the vice support frame in an embodiment of the present application.

[0020] Figure 3 It is a schematic diagram of the structure of the support column bottom in an embodiment of the present application.

[0021] Figure 4 It is a schematic diagram of the structure of the suction disc assembly in an embodiment of the present application.

[0022] Reference signs annotation: main support frame 100, intermediate support beam plate 200, connecting seat 210, movable support beam plate 300, auxiliary support frame 400, support column 410, sliding sleeve 420, roller 430, rack 440, top driving rod frame 450, top driving roller 460, lower mounting groove 470, inner extension groove 471, brake cylinder 480, brake piece 490, push-pull part 500, push-pull connecting rod 510, fulcrum seat 520, pin column 530, driving part 600, vertical wire rod 610, 620, sliding seat 630, opening support motor 640, guide rod 700, suction cup assembly 800, negative pressure suction groove body 810, adjusting diaphragm 820, fixing cylinder 830, adjusting rotating rod 840, outer sleeve 850, spiral part 860, gear part 870. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples; in the drawings or description, similar or identical parts use the same reference signs, and in practical application, the shape, thickness or height of each component can be enlarged or reduced. The listed examples of the present application are only used to illustrate the present application, and are not used to limit the scope of the present application. Any obvious modification or change made to the present application does not deviate from the spirit and scope of the present application.

[0024] In one embodiment, as shown in Figure 1 A post-cast strip support structure includes a main support frame 100 and a horizontal support member, the horizontal support member includes an intermediate support beam plate 200 arranged at the top end of the main support frame 100 and two movable support beam plates 300 arranged at both ends of the intermediate support beam plate 200 respectively, the movable support beam plates 300 are rotationally connected to the intermediate support beam plate 200 through the connecting seats 210 at the close ends; the bottom of the intermediate support beam plate 200 and the movable support beam plate 300 are provided with guide rods 700, when the intermediate support beam plate 200 and the movable support beam plate 300 are in a horizontal state, the guide rods 700 on the intermediate support beam plate 200 and the guide rods 700 on the movable support beam plate 300 can form a guide rail, the post-cast strip support structure further includes two auxiliary support frames 400, the two auxiliary support frames 400 are arranged at both sides of the main support frame 100 respectively, the top of the auxiliary support frame 400 is slidingly connected to the guide rod 700, the main support frame 100 is provided with an opening support mechanism, the opening support mechanism is connected to the two auxiliary support frames 400, and the opening support mechanism can drive the two auxiliary support frames 400 to move synchronously along the guide rod 700 and the moving direction of the two auxiliary support frames 400 is opposite;

[0025] In the embodiment of the present application, in the initial state of the support structure, the two auxiliary support frames 400 are close to the main support frame 100, and the two movable support beam plates 300 are in the vertical state due to their own gravity, so that the overall support structure has a small size and is convenient for transportation; when the support structure is installed, the middle support beam plate 200 is placed on the post-cast strip, and the main support frame 100 plays a supporting role, and the opening mechanism opens the two auxiliary support frames 400 to the two sides; when the auxiliary support frame 400 moves along the guide rod 700 and moves to the connection position of the middle support beam plate 200 and the movable support beam plate 300, the auxiliary support frame 400 that continues to move can push the movable support beam plate 300 to rotate around the connection position of the middle support beam plate 200, until the movable support beam plate 300 is rotated to the horizontal state, and the movable support beam plate 300 starts to support the corresponding part of the post-cast strip; when the movable support beam plate 300 is in the horizontal state, the top of the auxiliary support frame 400 and the guide rod 700 on the movable support beam plate 300 start to slide, and the auxiliary support frame 400 that continues to move starts to support the corresponding movable support beam plate 300, so that the main support frame 100 and the two auxiliary support frames 400 can cooperate with each other to stably support the post-cast strip, and are convenient for installation, disassembly and transportation.

[0026] In one embodiment, as shown in Figure 1 and Figure 2 , the auxiliary support frame 400 includes a support column 410, a sliding sleeve 420 and a pushing part, the lower end of the support column 410 is provided with a roller 430 in rolling contact with the ground, the sliding sleeve 420 is arranged at the top end of the support column 410 and can slide with the guide rod 700, and the pushing part is arranged at the top end of the support column 410 and is located away from the main support frame 100; in the embodiment of the present application, the roller 430 rolls on the ground and plays a role in supporting the support column 410, facilitating the horizontal movement of the support column 410; before the sliding sleeve 420 and the guide rod 700 on the movable support beam plate 300 slide, the pushing part contacts the movable support beam plate 300 in the vertical state, the horizontally moving pushing part pushes the movable support beam plate 300 to rotate around the connecting seat 210, until the movable support beam plate 300 is rotated to the horizontal state, at this time, the guide rod 700 on the movable support beam plate 300 and the guide rod 700 on the middle support beam plate 200 are aligned at the end position, facilitating the movement of the sliding sleeve 420 to the guide rod 700 on the movable support beam plate 300.

[0027] In one embodiment, as shown in Figure 2As shown, the top driving part comprises a top driving rod frame 450 arranged at the side of the support column 410 and a top driving roller 460 rotatably arranged at the end of the top driving rod frame 450 away from the support column 410; in the embodiment of the present application, when the top driving part drives the movable support beam plate 300 to rotate around the connecting seat 210, the top driving rod frame 450 is in rolling contact with the movable support beam plate 300, and when the movable support beam plate 300 is in the horizontal state, the arc top of the top driving rod frame 450 is in contact with the movable support beam plate 300, thereby ensuring that the movable support beam plate 300 can be rotated to the horizontal state.

[0028] In one embodiment, as shown in Figure 2 and Figure 3 As shown, the bottom of the support column 410 is provided with a lower mounting groove 470, and the roller member 430 is mounted inside the lower mounting groove 470, the top wall of the lower mounting groove 470 is provided with an inner extension groove 471, and the inner extension groove 471 is internally provided with a brake cylinder 480, and the lower end of the brake cylinder 480 is provided with a side portion in sliding fit with the inner wall of the lower mounting groove 470; in the embodiment of the present application, the brake cylinder 480 drives the brake piece 490 to move up and down inside the lower mounting groove 470 through extension and retraction, and the brake piece 490 is close to or away from the roller member 430, when the brake piece 490 is close to the roller member 430 and in contact with the outer wall, the brake piece 490 can limit the rotation of the roller member 430, thereby avoiding the vibration of the secondary support frame 400 when supporting the movable support beam plate 300 due to the rolling contact of the roller member 430 with the ground.

[0029] In one embodiment, as shown in Figure 1 As shown, the expansion mechanism comprises a driving part 600 arranged on the main support frame 100 and two groups of push-pull parts 500 arranged on the two sides of the driving part 600, the push-pull part 500 comprises two mutually intersecting push-pull connecting rods 510, the middle portions of the two push-pull connecting rods 510 are rotatably connected through a pin column 530, the end portions of the push-pull connecting rods 510 are provided with a fulcrum seat 520 hinged thereto, the fulcrum seat 520 close to the secondary support frame 400 is in sliding fit with the secondary support frame 400, and the fulcrum seat 520 close to the driving part 600 is connected with the driving part 600, the driving part 600 drives the two push-pull connecting rods 510 to rotate around the pin column 530 by driving the fulcrum seat 520 to move vertically; in the embodiment of the present application, the two groups of push-pull parts 500 are driven by the driving part 600 to rotate the two mutually intersecting push-pull connecting rods 510 to drive the secondary support frame 400 to move away from or close to the main support frame 100.

[0030] In one embodiment, as shown in Figure 1As shown, the drive unit 600 includes a vertical lead screw 610, a slide block 630, and a spreading motor 640. The vertical lead screw 610 is rotatably mounted on the inner side of the main support frame 100. The two ends of the vertical lead screw 610 have opposite spiral directions, and the output end of the spreading motor 640 is connected to one end of the vertical lead screw 610. There are two slide blocks 630, which are correspondingly located at the two ends of the vertical lead screw 610. The fulcrum seat 520 on the end of the push-pull link 510 is connected to the slide block 630. In this embodiment of the invention, the vertical lead screw 610 can rotate under the drive of the spreading motor 640. The rotating vertical lead screw 610 drives the two slide blocks 630 on it to move closer to each other or further away from each other, so that the end of the push-pull link 510 can move along the main support frame 100. Then, the two push-pull links 510 can rotate relative to each other to realize the pulling and pushing of the auxiliary support frame 400.

[0031] In one embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, both the intermediate support beam 200 and the movable support beam 300 have a U-shaped structure. Multiple linearly arranged suction cup assemblies 800 are provided on the sides of both the intermediate support beam 200 and the movable support beam 300. The top of each suction cup assembly 800 is flush with the upper surface of the intermediate support beam 200. When the secondary support frame 400 moves towards the end of the movable support beam 300 and passes the suction cup assembly 800, the secondary support frame 400 can drive the upper end of the suction cup assembly 800 to adhere to the wall surface. In this embodiment of the invention, multiple suction cup assemblies 800 adhere to the wall surface, thereby forming multiple support points, improving the overall strength of the support. Furthermore, the adhesion of the suction cup assemblies 800 to the wall surface is automatically achieved during the process of the secondary support frame 400 moving towards the end of the movable support beam 300, facilitating operation.

[0032] In one embodiment, such as Figure 1 , Figure 2 and Figure 4As shown, the side of the auxiliary support frame 400 is provided with a rack portion 440, the suction cup assembly 800 comprises a negative pressure adsorption groove body 810 and an adjusting diaphragm 820, the negative pressure adsorption groove body 810 is upwardly provided with a port and the arc bottom of the negative pressure adsorption groove body 810 is fixed on the horizontal support member through a fixing cylinder 830, the adjusting diaphragm 820 is arranged inside the negative pressure adsorption groove body 810 and the edge of the adjusting diaphragm 820 is sealingly connected with the inner wall of the negative pressure adsorption groove body 810, the arc bottom of the adjusting diaphragm 820 is provided with an adjusting rotating rod 840, the arc bottom of the negative pressure adsorption groove body 810 is provided with an outer sleeve 850 which is rotationally matched with the negative pressure adsorption groove body 810, the adjusting rotating rod 840 passes through the outer sleeve 850 and is provided with a screw portion 860 which is screwingly matched with the horizontal support member, the end of the adjusting rotating rod 840 which is located at the lower side of the horizontal support member is provided with a gear portion 870 which can be engaged with the rack portion 440; in the embodiment of the present application, when the auxiliary support frame 400 moves towards the end of the movable support beam plate 300 and passes through the suction cup assembly 800, the rack portion 440 is just in the engaged state with the gear portion 870, the rack portion 440 drives the adjusting rotating rod 840 to rotate, the adjusting rotating rod 840 is downwardly moved through the screwing of the screw portion 860 and the horizontal support member, and then the adjusting rotating rod 840 can pull the adjusting diaphragm 820 to move to the inside of the negative pressure adsorption groove body 810, increase the space between the adjusting diaphragm 820 and the wall surface, reduce the internal pressure, so that the negative pressure adsorption groove body 810 can be adsorbed on the wall surface; when the auxiliary support frame 400 moves back, the adjusting rotating rod 840 is reversely rotated, the adjusting rotating rod 840 pushes the adjusting diaphragm 820 to move towards the port of the negative pressure adsorption groove body 810, so as to reduce the space between the adjusting diaphragm 820 and the wall surface, increase the internal pressure, and the negative pressure adsorption groove body 810 is facilitated to be separated from the wall surface.

[0033] The above embodiment provides a post-poured strip support structure, wherein in the initial state of the support structure, the two auxiliary support frames 400 are close to the main support frame 100, and the two movable support beam plates 300 are in the vertical state due to their own gravity, so that the overall support structure has a small size and is convenient for transportation; when the support structure is installed, the middle support beam plate 200 is placed on the post-poured strip and the main support frame 100 plays a supporting role, and the opening mechanism opens the two auxiliary support frames 400 to the two sides respectively; when the auxiliary support frame 400 moves along the guide rod 700 and moves to the connection position of the middle support beam plate 200 and the movable support beam plate 300, the auxiliary support frame 400 that continues to move can drive the movable support beam plate 300 to rotate around the connection position of the middle support beam plate 200, until the movable support beam plate 300 is rotated to the horizontal state, and the movable support beam plate 300 starts to support the post-poured strip corresponding to the movable support beam plate 300; when the movable support beam plate 300 is in the horizontal state, the top of the auxiliary support frame 400 and the guide rod 700 on the movable support beam plate 300 start to slide, and the auxiliary support frame 400 that continues to move starts to support the corresponding movable support beam plate 300, so that the main support frame 100 and the two auxiliary support frames 400 can cooperate with each other to stably support the post-poured strip, and are convenient for installation, disassembly and transportation.

[0034] The above merely provides a specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A post-cast strip support structure comprising a main support frame and horizontal support members, the horizontal support members comprising a middle support beam plate arranged at a top end of the main support frame and two movable support beam plates respectively arranged at both ends of the middle support beam plate, the movable support beam plates being rotationally connected to the middle support beam plate through connecting seats; characterized in that, Guide rods are provided at the bottom of both the intermediate support beam plate and the movable support beam plate. When both the intermediate support beam plate and the movable support beam plate are in a horizontal state, the guide rods on the intermediate support beam plate and the movable support beam plate can form a guide rail. It also includes two auxiliary support frames, which are respectively located on both sides of the main support frame, and the top of the auxiliary support frames is slidably connected to the guide rod; The main support frame is equipped with a spreading mechanism, which is connected to both secondary support frames. The spreading mechanism can drive the two secondary support frames to move synchronously along the guide rod, and the two secondary support frames move in opposite directions. The opening mechanism includes a drive unit and two sets of push-pull units; The drive unit is mounted on the main support frame, and the two push-pull parts are respectively located on both sides of the drive unit. The push-pull part includes two intersecting push-pull connecting rods, and the two push-pull connecting rods are rotatably connected in the middle by a pin. Each end of the push-pull linkage is provided with a pivot seat that is hinged to it. The pivot seat near the secondary support frame is slidably engaged with the secondary support frame, and the pivot seat near the drive unit is connected to the drive unit. The drive unit causes the two push-pull linkages to rotate around the pin by driving the fulcrum to move vertically.

2. The post-cast strip support structure according to claim 1, wherein, The secondary support frame includes a support column, a sliding component, and a jacking part; The lower end of the support column is provided with a roller component that rolls in contact with the ground, and the sliding sleeve is provided at the top of the support column and can slide in cooperation with the guide rod. The jacking part is located at the top of the support column and on the side away from the main support frame.

3. The post-cast strip support structure according to claim 2, wherein, The jacking part includes a jacking rod frame and a jacking roller. The jacking rod frame is located on the side of the support column, and the jacking roller is rotatably located at the end of the jacking rod frame away from the support column.

4. The post-cast strip support structure according to claim 2, wherein, The bottom of the support column is provided with a lower mounting groove and the roller is installed inside the lower mounting groove. The top wall of the lower mounting groove is provided with an inner extension groove and a brake cylinder is installed inside the inner extension groove. The lower end of the brake cylinder is provided with a brake pad that slides with the side of the lower mounting groove.

5. The post-cast strip support structure of claim 1, wherein, The drive unit includes a vertical lead screw, a slide block, and a spreading motor; The vertical lead screw is rotatably located inside the main support frame, with opposite spiral directions at both ends of the vertical lead screw and the output end of the motor connected to one end of the vertical lead screw. There are two slides, which are correspondingly located at the two ends of the vertical lead screw. The fulcrum seat on the end of the push-pull connecting rod is connected to the slide.

6. The post-cast strip support structure of claim 1, wherein, Both the intermediate support beam and the movable support beam have a Z-shaped structure. Both the intermediate support beam and the movable support beam are equipped with multiple linearly arranged suction cup assemblies on their sides. The top of the suction cup assembly is flush with the upper surface of the middle support beam. When the secondary support frame moves toward the end of the movable support beam and passes the suction cup assembly, the secondary support frame can drive the upper end of the suction cup assembly to adhere to the wall.

7. The post-cast strip support structure according to claim 6, wherein, The side portion of the auxiliary support frame is provided with a rack portion; The suction cup assembly includes a negative pressure suction groove and an adjustment diaphragm; The negative pressure adsorption tank has its port facing upwards and its arc bottom is fixed to the horizontal support member by a fixing cylinder. The adjusting diaphragm is located inside the negative pressure adsorption tank and its edge is sealed to the inner wall of the negative pressure adsorption tank. The adjusting diaphragm is provided with an adjusting rod at its arc bottom, and the negative pressure adsorption tank is provided with an outer sleeve that rotates with it at its arc bottom. The adjusting rod passes through the outer sleeve, and a screw part matched with the horizontal support member is arranged on the adjusting rod. An end of the adjusting rod located at the lower side of the horizontal support member is provided with a gear part capable of engaging with a rack part.

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