Building outer wall water seepage testing device for construction engineering management

Abstract

The application relates to the technical field of building outer wall water seepage testing, and discloses a building outer wall water seepage testing device for building engineering management, which comprises a base, a lifting platform, a water tank, a water pump, a water pipe and a spray head. The top of the base is provided with air cylinders on both sides, the output shafts of the air cylinders are fixedly connected with the lifting platform, the top of the lifting platform is connected with box bodies on both sides, and strip-shaped holes are vertically arranged on the box bodies. Vertical grooves are vertically arranged on the inner walls of the box bodies, and movable blocks are slidably connected in the vertical grooves. A rotating shaft is rotatably connected to the movable blocks, the spray head is sleeved on the rotating shaft, and the spray head can vertically move and rotate in the strip-shaped holes. The water tank and the water pump are fixedly connected to the movable blocks, the two ends of the water pump are respectively communicated with the water tank and the water pipe, and the water pipe is communicated with the spray head. The device further comprises a driving mechanism for driving the movable blocks to vertically reciprocate and an adjusting mechanism for driving the spray head to reciprocate and rotate along with the vertical movement of the movable blocks. The scheme mainly solves the problem that the spray head of the existing building outer wall water seepage testing device cannot be automatically adjusted.

Description

Technical Field

[0001] This invention relates to the field of building exterior wall seepage testing technology, specifically to a building exterior wall seepage testing device for building engineering management. Background Technology

[0002] From an architectural perspective, the building's enclosing structure that forms the boundary between the interior and exterior is called the exterior wall. Its functions include: bearing a certain load, protecting against wind and rain, providing thermal insulation, preventing noise, and ensuring fire safety. Water seepage testing is an important part of building exterior wall inspection. It is usually done by simulating rain to spray the exterior wall. However, traditional spraying devices have a limited spray range and require constant adjustment of the device's position, making the operation very cumbersome.

[0003] To address the aforementioned issues, Chinese Patent Publication No. CN214951993U discloses a building exterior wall seepage testing device for supervision purposes. The device includes a base with a water tank on it. The water tank contains an inlet pipe and an electric telescopic column. A water pump is located inside the water tank. A fixed seat is mounted on the electric telescopic column, and a rotating rod is located inside the fixed seat. A nozzle is mounted on the rotating rod. The base has casters at its four corners for movement and spray direction adjustment. This patent, through the placement of the nozzles, enhances the spraying effect during simulated spraying tests.

[0004] In actual use, the aforementioned patent primarily involves spraying the exterior walls with nozzles. Although the nozzles can be rotated and their angle adjusted via a rotating rod, the rotation of the rod is not self-rotating but requires external force, such as manual adjustment, which leads to cumbersome operation. Furthermore, while the nozzles can move vertically under the action of the electric telescopic column to adjust their spray height, they can only spray at different heights in the same location, resulting in a limited spray range, which in turn prolongs the spraying time and reduces work efficiency. Summary of the Invention

[0005] The present invention aims to provide a building exterior wall seepage testing device for building engineering management, so as to solve the problem that the nozzle of the existing exterior wall seepage testing device cannot automatically adjust the angle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a building exterior wall seepage testing device for construction engineering management, comprising a base, a lifting platform, a water tank, a water pump, a water pipe, and a nozzle. Cylinders are provided on both sides of the top of the base, and the output shafts of the cylinders are fixedly connected to the lifting platform. A housing is connected to both sides of the top of the lifting platform, and a vertically oriented slot is provided on the housing. A vertical groove is provided on the inner wall of the housing, and a movable block is slidably connected within the vertical groove. A rotating shaft is rotatably connected to the movable block, and the nozzle is sleeved on the rotating shaft, allowing the nozzle to move and rotate vertically within the slot. The water tank and water pump are both fixedly connected to the movable block, with both ends of the water pump connected to the water tank and the water pipe, respectively. The end of the water pipe furthest from the water pump is connected to the nozzle. The device also includes a drive mechanism for driving the movable block to reciprocate vertically and an adjustment mechanism for driving the nozzle to reciprocate vertically as the movable block moves vertically.

[0007] The principles and advantages of this scheme are: 1. This solution uses a drive mechanism to move a movable block back and forth within a vertical groove. During this vertical movement, the movable block, through an adjustment mechanism, drives the nozzle to rotate in both directions. A water pump introduces clean water from the tank into the nozzle via a water pipe. The clean water is then applied to the exterior wall through the nozzle to test for water seepage. Compared to existing technologies, this solution allows the nozzle to automatically adjust its angle, thereby automatically adjusting the spray angle and expanding the spray area. This means that a larger area of ​​the exterior wall can be sprayed in a shorter time, improving spray efficiency and thus enhancing testing efficiency.

[0008] 2. During the vertical movement of the movable block in this solution, the movable block will also drive the nozzle to move vertically within the strip hole through the rotating shaft, thereby increasing the spraying area of ​​the nozzle in the vertical direction. This means that more areas of the exterior wall can be sprayed in a short time, improving spraying efficiency and thus improving testing efficiency.

[0009] 3. This solution adjusts the height of the lifting platform according to usage needs, thereby adjusting the height of the nozzles. The specific adjustment method is as follows: start the cylinder, the output shaft of the cylinder drives the lifting platform to move vertically, the lifting platform drives the nozzles to move vertically, and when it reaches the designated position, close the cylinder to fix the lifting platform at the designated height for testing on the exterior wall.

[0010] Furthermore, the drive mechanism includes a round shaft, a linkage shaft, and a drive unit for driving the round shaft to rotate. A first cam is coaxially connected to the round shaft, and the first cam abuts against the top of the movable block. A second cam is coaxially connected to the linkage shaft, and the second cam abuts against the bottom of the movable block. The protruding part of the second cam faces in the opposite direction to the protruding part of the first cam. It also includes a linkage unit that drives the linkage shaft to rotate as the round shaft rotates.

[0011] With the above configuration, the drive unit drives the circular shaft to rotate, and the circular shaft drives the first cam to rotate. During the rotation of the circular shaft, the circular shaft drives the linkage shaft to rotate through the linkage unit, and the linkage shaft drives the second cam to rotate. Since the first cam abuts against the top of the movable block and the second cam abuts against the bottom of the movable block, and the convex part of the second cam faces in the opposite direction to the convex part of the first cam, the first cam and the second cam act on the movable block simultaneously, enabling vertical reciprocating motion along the path of the vertical groove.

[0012] Furthermore, the linkage includes a drive sprocket, a driven sprocket, and a chain. The drive sprocket is coaxially connected to the round shaft, the driven sprocket is coaxially connected to the linkage shaft, and the chain is sleeved between the drive sprocket and the driven sprocket.

[0013] With the above configuration, during the rotation of the circular shaft, the circular shaft drives the drive sprocket to rotate, the drive sprocket drives the driven sprocket to rotate via a chain, the driven sprocket drives the linkage shaft to rotate, and the linkage shaft drives the second cam to rotate.

[0014] Furthermore, the adjustment mechanism includes a first gear coaxially connected to the rotating shaft, a first adjustment part and a second adjustment part respectively located on the inner walls of both sides of the housing, with the first gear located between the first adjustment part and the second adjustment part; the first adjustment part includes a plurality of first racks fixedly connected at equal intervals to the inner wall of the housing, and the second adjustment part includes a plurality of second racks fixedly connected at equal intervals to the inner wall of the housing, with the plurality of first racks and the plurality of second racks being staggered on the inner walls of both sides of the housing along the vertical direction of the housing; both the first racks and the second racks are located on the movement trajectory of the first gear.

[0015] With the above configuration, during the vertical movement of the movable block, the vertical block drives the nozzle to move vertically within the strip hole; during the vertical movement of the movable block, the movable block drives the rotating shaft to move vertically, and the rotating shaft drives the first gear to move vertically, so that the first gear intermittently meshes with the first rack and the second rack. Since several first racks and several second racks are staggered on the inner walls of both sides of the box along the vertical direction of the box, the first gear can rotate back and forth, and the first gear drives the nozzle to rotate back and forth within the strip hole through the rotating shaft.

[0016] Furthermore, the movable block is provided with a side block, which is located below the rotating shaft; the side block is provided with an inclined plate that passes through the strip hole, and the inclined plate can move vertically within the strip hole, with the height of the end of the inclined plate near the side block being greater than the height of the free end of the inclined plate.

[0017] With the above setup, during the spraying process, most of the water will directly act on the exterior wall, while a small portion will fall down onto the inclined plate. Guided by the inclined plate, the water will act on the exterior wall, thereby increasing the water seepage area of ​​the exterior wall and improving the testing efficiency.

[0018] Furthermore, both sides of the inclined plate are provided with baffles that pass through the strip holes, and the baffles can move vertically within the strip holes.

[0019] With the above setup, water falling onto the inclined plate may splash. The baffle can prevent water from splashing, thus allowing more water to be guided onto the exterior wall by the inclined plate, thereby improving the utilization rate of water.

[0020] Furthermore, a drive shaft and a driven shaft are rotatably connected on the baffle. The drive shaft is located inside the housing, and the driven shaft is located outside the housing. A belt is sleeved between the drive shaft and the driven shaft. A second gear is coaxially connected on the drive shaft, and both the first rack and the second rack are located on the movement trajectory of the second gear. Several blades are circumferentially provided on the driven shaft.

[0021] With the above setup, during the vertical movement of the movable block, the movable block drives the baffle to move vertically within the slotted hole via the side block. During this movement, the second gear intermittently meshes with the first and second racks, causing the second gear to rotate. The second gear drives the drive shaft to rotate, and the drive shaft drives the driven shaft to rotate via a belt. The driven shaft then drives the blades to rotate. As the water falls downwards onto the inclined plate, some of the water impacts the outer wall under the action of the blades, thus providing impact force to the water and enhancing the water seepage effect on the outer wall, which is beneficial for testing the water seepage of the outer wall.

[0022] Furthermore, the top two sides of the lifting platform are provided with guide grooves, and the housing is slidably connected to the guide grooves; the lifting platform is provided with a chamber, which is connected to the guide groove; a bidirectional screw is rotatably connected to the lifting platform, the bidirectional screw passes through the chamber, and the two housings are respectively threaded to the two ends of the bidirectional screw; it also includes a power unit for driving the bidirectional screw to rotate.

[0023] With the above settings, the horizontal position of the housing can be adjusted according to the needs of use, thereby adjusting the horizontal spray position of the nozzles. Specifically, the adjustment direction is as follows: the power unit drives the bidirectional screw to rotate, causing the two housings to move closer or further apart, which in turn causes the two nozzles to move closer or further apart, thereby adjusting the nozzles to the specified horizontal position for testing of the exterior wall. Attached Figure Description

[0024] Figure 1 This is a front view of an embodiment of a building exterior wall seepage testing device for building engineering management according to the present invention; Figure 2 for Figure 1 A sectional view from the front view direction; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 3 Enlarged view at point B in the middle; Figure 5 for Figure 4 Top view of the inclined plate. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: base 10, lifting platform 11, water tank 12, water pump 13, water pipe 14, nozzle 15, cylinder 16, housing 20, strip hole 21, vertical groove 22, movable block 23, rotating shaft 24, round shaft 30, linkage shaft 31, first cam 32, second cam 33, first motor 34, driving sprocket 35, driven sprocket 36, chain 37, first gear 40, first rack 41, second rack 42, side block 50, inclined plate 51, baffle 52, driving shaft 53, driven shaft 54, second gear 55, belt 56, blade 57, guide groove 60, chamber 61, bidirectional screw 62, and second motor 63.

[0026] Example The basics are as follows: Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 4 Appendix Figure 5 As shown: A building exterior wall seepage testing device for building engineering management includes a base 10, a lifting platform 11, a water tank 12, a water pump 13, a water pipe 14 and a nozzle 15. Cylinders 16 are fixedly connected to both sides of the top of the base 10, and the output shaft of the cylinders 16 is fixedly connected to the lifting platform 11.

[0027] The top of the lifting platform 11 is connected to two boxes 20 on both sides. A vertically oriented slot 21 is formed on the side wall of the box 20. A vertical groove 22 is formed on the inner wall of the box 20, and a movable block 23 is slidably connected within the groove 22. A rotating shaft 24 is rotatably connected to the side wall of the movable block 23. A nozzle 15 is fitted onto the rotating shaft 24, allowing the nozzle 15 to move and rotate vertically within the slot 21. The water tank 12 is a commercially available type, and sufficient clean water is introduced into it. Both the water tank 12 and the water pump 13 are fixedly connected to the movable block 23. The two ends of the water pump 13 are connected to the water tank 12 and the water pipe 14, respectively. The end of the water pipe 14 furthest from the water pump 13 is connected to the nozzle 15. The water pipe 14 is a flexible hose with sufficient length. It also includes a drive mechanism for driving the movable block 23 to reciprocate vertically. The drive mechanism includes a round shaft 30, a linkage shaft 31, and a drive unit for driving the round shaft 30 to rotate. The round shaft 30 is located above the linkage shaft 31. A first cam 32 is coaxially connected to the round shaft 30 and abuts against the top of the movable block 23. A second cam 33 is coaxially connected to the linkage shaft 31 and abuts against the bottom of the movable block 23. The convex part of the second cam 33 faces the opposite direction to the convex part of the first cam 32. That is, when the convex direction of the second cam 33 is upward, the convex direction of the first cam 32 is downward. The drive unit is a first motor 34, which is a servo motor. The first motor 34 is fixed to the inner wall of the housing 20, and the output shaft of the first motor 34 is coaxially connected to the round shaft 30. It also includes a linkage part that drives the linkage shaft 31 to rotate as the round shaft 30 rotates. The linkage part includes a driving sprocket 35, a driven sprocket 36 and a chain 37. The driving sprocket 35 is coaxially connected to the round shaft 30, the driven sprocket 36 is coaxially connected to the linkage shaft 31, and the chain 37 is sleeved between the driving sprocket 35 and the driven sprocket 36.

[0028] It also includes an adjustment mechanism that drives the nozzle 15 to reciprocate as the movable block 23 moves vertically. The adjustment mechanism includes a first gear 40 coaxially connected to the rotating shaft 24, a first adjustment part and a second adjustment part located on the inner walls of both sides of the housing 20 respectively. The rotating shaft 24, the first gear 40 and the water pipe 14 are all located between the first adjustment part and the second adjustment part along the vertical direction of the housing 20. The first adjustment part includes a plurality of first racks 41 fixed at equal distances to the inner wall of the housing 20. The second adjustment part includes a plurality of second racks 42 fixed at equal distances to the inner wall of the housing 20. The plurality of first racks 41 and the plurality of second racks 42 are staggered on the inner walls of both sides of the housing 20 along the vertical direction of the housing 20. The first racks 41 and the second racks 42 are both located on the movement trajectory of the first gear 40. The first gear 40 can mesh with the first racks 41 and the second racks 42.

[0029] A side block 50 is fixedly connected to the side wall of the movable block 23. The side block 50 is located below the rotating shaft 24 and is positioned between the first rack 41 and the second rack 42 along the vertical direction of the housing 20. An inclined plate 51 passing through the strip hole 21 is fixedly connected to the side block 50. The inclined plate 51 can move vertically within the strip hole 21. The height of the end of the inclined plate 51 near the side block 50 is greater than the height of the free end of the inclined plate 51. Baffles 52 passing through the strip hole 21 are fixedly connected to both sides of the inclined plate 51. The baffles 52 can move vertically within the strip hole 21.

[0030] A drive shaft 53 and a driven shaft 54 ​​are rotatably connected to the baffle 52. The drive shaft 53 is located inside the housing 20, and the driven shaft 54 ​​is located outside the housing 20. A belt 56 is sleeved between the drive shaft 53 and the driven shaft 54. A second gear 55 is coaxially connected to the drive shaft 53. The drive shaft 53 and the second gear 55 are both located between the first rack 41 and the second rack 42 along the vertical direction of the housing 20. The first rack 41 and the second rack 42 are both located on the movement trajectory of the second gear 55. The second gear 55 can mesh with the first rack 41 and the second rack 42. Several blades 57 are circumferentially fixed to the driven shaft 54.

[0031] The top of the lifting platform 11 has guide grooves 60 on both sides, and the housing 20 is slidably connected to the guide grooves 60. The lifting platform 11 has a chamber 61, which communicates with the guide grooves 60. A bidirectional screw 62 is rotatably connected to the lifting platform 11, and the bidirectional screw 62 passes through the chamber 61. The two housings 20 are threaded to the two ends of the bidirectional screw 62, and the housings 20 are slidably connected to the chamber 61. The lifting platform 11 also includes a power unit for driving the bidirectional screw 62 to rotate. The power unit is a second motor 63, which is a servo motor. The second motor 63 is fixed to the lifting platform 11, and the output shaft of the second motor 63 is coaxially connected to the bidirectional screw 62.

[0032] The specific implementation process is as follows: In use, move the base 10 to the location of the exterior wall to be tested; adjust the height of the lifting platform 11 according to the needs of use, and then adjust the height of the nozzle 15. The specific adjustment method is as follows: start the cylinder 16, the output shaft of the cylinder 16 drives the lifting platform 11 to move vertically, the lifting platform 11 drives the nozzle 15 to move vertically, and when it reaches the designated position, close the cylinder 16 to fix the lifting platform 11 at the designated height for testing the exterior wall.

[0033] The first motor 34 is started, and the output shaft of the first motor 34 drives the round shaft 30 to rotate. The round shaft 30 drives the first cam 32 to rotate. During the rotation of the round shaft 30, the round shaft 30 drives the drive sprocket 35 to rotate. The drive sprocket 35 drives the driven sprocket 36 to rotate through the chain 37. The driven sprocket 36 drives the linkage shaft 31 to rotate. The linkage shaft 31 drives the second cam 33 to rotate. Since the first cam 32 abuts against the top of the movable block 23 and the second cam 33 abuts against the bottom of the movable block 23, and the convex part of the second cam 33 faces the opposite direction to the convex part of the first cam 32, the first cam 32 and the second cam 33 act on the movable block 23 at the same time, which enables vertical reciprocating motion along the path of the vertical groove 22.

[0034] During the vertical movement of the movable block 23, the vertical block drives the nozzle 15 to move vertically within the strip hole 21; during the vertical movement of the movable block 23, the movable block 23 drives the rotating shaft 24 to move vertically, and the rotating shaft 24 drives the first gear 40 to move vertically, so that the first gear 40 intermittently meshes with the first rack 41 and the second rack 42. Since several first racks 41 and several second racks 42 are staggered on the inner walls of both sides of the housing 20 along the vertical direction of the housing 20, the first gear 40 can rotate back and forth. The first gear 40 drives the nozzle 15 to rotate back and forth within the strip hole 21 through the rotating shaft 24.

[0035] Start the water pump 13, and the water pump 13 will pump the clean water in the water tank 12 into the water pipe 14. The clean water will then be sprayed onto the exterior wall through the nozzle 15 via the water pipe 14. Since the nozzle 15 can move vertically and rotate back and forth within the strip hole 21, the spraying area is expanded, which means that more areas of the exterior wall can be sprayed in a short time, thus improving the spraying efficiency and thus improving the testing efficiency.

[0036] During the spraying process, most of the water will directly act on the exterior wall, while a small portion will fall downwards onto the inclined plate 51. Guided by the inclined plate 51, the water will act on the exterior wall, thereby increasing the water seepage area and improving testing efficiency. Furthermore, water falling onto the inclined plate 51 may splash, but the baffle 52 can prevent water splashing, allowing more water to act on the exterior wall under the guidance of the inclined plate 51, thus improving water utilization.

[0037] During the vertical movement of the movable block 23, the movable block 23 drives the baffle 52 to move vertically within the strip hole 21 via the side block 50. During this movement, the second gear 55 intermittently meshes with the first rack 41 and the second rack 42, causing the second gear 55 to rotate. The second gear 55 drives the drive shaft 53 to rotate, and the drive shaft 53 drives the driven shaft 54 ​​to rotate via the belt 56. The driven shaft 54 ​​drives the blade 57 to rotate. As the water falls downwards onto the inclined plate 51, some of the water impacts the outer wall under the action of the blade 57, thus providing impact force to the water and enhancing the water seepage effect on the outer wall, which is beneficial for testing the water seepage of the outer wall.

[0038] Depending on the usage requirements, the position of the housing 20 in the horizontal direction can also be adjusted, thereby adjusting the spray position of the nozzle 15 in the horizontal direction. Specifically, the adjustment direction is as follows: start the second motor 63, the output shaft of the second motor 63 drives the bidirectional screw 62 to rotate, so that the two housings 20 move closer or further away, thereby driving the two nozzles 15 to move closer or further away. When the designated position is reached, turn off the second motor 63, so that the bidirectional screw 62 stops moving, and the housing 20 stops moving, so that the nozzle 15 is fixed in the designated horizontal position for testing the exterior wall.

[0039] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A building exterior wall seepage testing device for construction engineering management, comprising a base, a lifting platform, a water tank, a water pump, water pipes, and nozzles, wherein cylinders are provided on both sides of the top of the base, and the output shafts of the cylinders are fixedly connected to the lifting platform, characterized in that: The top of the lifting platform is connected to two boxes, each with a vertically oriented slot. A vertical groove is formed on the inner wall of the box, within which a movable block is slidably connected. A rotating shaft is rotatably connected to the movable block, and a nozzle is fitted onto the rotating shaft, allowing the nozzle to move and rotate vertically within the slot. A water tank and a water pump are fixedly connected to the movable block. The two ends of the water pump are connected to the water tank and a water pipe, respectively, with the end of the water pipe furthest from the water pump connected to the nozzle. The platform also includes a drive mechanism for driving the movable block's vertical reciprocating motion and an adjustment mechanism that drives the nozzle to reciprocate as the movable block moves vertically. The adjustment mechanism includes a first gear coaxially connected to the rotating shaft, a first adjustment part located on each side of the inner wall of the box, and a second adjustment part. The first gear is located between the first and second adjustment parts. The first adjustment part includes several first racks equidistantly fixed to the inner wall of the box, and the second adjustment part includes... Several second racks are fixedly connected at equal intervals to the inner wall of the housing. Several first racks and several second racks are staggered on the inner walls of both sides of the housing along the vertical direction of the housing. The first racks and second racks are both located on the movement trajectory of the first gear. A side block is provided on the movable block, and the side block is located below the rotating shaft. An inclined plate passing through a strip hole is provided on the side block. The inclined plate can move vertically in the strip hole. The height of the end of the inclined plate near the side block is greater than the height of the free end of the inclined plate. Baffles passing through the strip hole are provided on both sides of the inclined plate. The baffles can move vertically in the strip hole. A drive shaft and a driven shaft are rotatably connected to the baffles. The drive shaft is located inside the housing, and the driven shaft is located outside the housing. A belt is sleeved between the drive shaft and the driven shaft. A second gear is coaxially connected to the drive shaft. The first rack and second rack are both located on the movement trajectory of the second gear. Several blades are provided circumferentially on the driven shaft.

2. The building exterior wall seepage testing device for construction project management according to claim 1, characterized in that: The drive mechanism includes a round shaft, a linkage shaft, and a drive unit for driving the round shaft to rotate. A first cam is coaxially connected to the round shaft, and the first cam abuts against the top of the movable block. A second cam is coaxially connected to the linkage shaft, and the second cam abuts against the bottom of the movable block. The protruding part of the second cam faces in the opposite direction to the protruding part of the first cam. The mechanism also includes a linkage unit that drives the linkage shaft to rotate as the round shaft rotates.

3. The building exterior wall seepage testing device for construction project management according to claim 2, characterized in that: The linkage includes a drive sprocket, a driven sprocket, and a chain. The drive sprocket is coaxially connected to the round shaft, the driven sprocket is coaxially connected to the linkage shaft, and the chain is sleeved between the drive sprocket and the driven sprocket.

4. The building exterior wall seepage testing device for construction project management according to claim 3, characterized in that: The top of the lifting platform is provided with guide grooves on both sides, and the housing is slidably connected to the guide grooves; the lifting platform is provided with a chamber, which is connected to the guide groove; a bidirectional screw is rotatably connected to the lifting platform, the bidirectional screw passes through the chamber, and the two housings are respectively threaded to the two ends of the bidirectional screw; it also includes a power unit for driving the bidirectional screw to rotate.

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