Wastewater treatment equipment for industrial production

Abstract

The invention relates to the technical field of wastewater treatment, and discloses wastewater treatment equipment for industrial production, which comprises a conveying device positioned at the top of a sewage pool, in the path of the first quarter circle where the scum scraping plate moves upwards, the free end of the scum scraping plate is kept inclined downwards all the time, sewage and scum on the surface of the scum scraping plate are preliminarily and automatically drained, the scum is more concentrated and is easy to treat, and when the scum scraping plate moves upwards to the second quarter circle, the rotating rod rotates, and the scum scraping plate moves upwards to the second quarter circle. The connecting plate and the scum scraping plate form an included angle of 90 degrees, so that the free end of the scum scraping plate is still kept inclined downwards all the time, residual sewage and scum on the scum scraping plate are prevented from dripping onto the conveying device and refluxing into a sewage pool from the conveying device for the second time, and the water quality purification effect is improved; the cleaning plate is driven to move to scrape scum on the surface of the scum scraping plate, so that the water quality purification effect is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to wastewater treatment equipment for industrial production. Background Art

[0002] The suspended impurities in the flotation tank sewage float to the surface after treatment and form waste residues. When accumulated to a certain extent, they need to be removed to achieve the purpose of sewage purification. The scraper satisfies the function of removing the residues. After the sewage enters the flotation tank, it first passes through the reaction zone, where small suspended particles are aggregated into large particles through the dosing, and then enters the contact zone with dissolved air water. The fine bubbles in the dissolved air water adhere to the surface of the suspended particles, forming floccules with a specific gravity less than that of water, and then enters the separation zone, where it floats to the surface and forms waste residues.

[0003] The scraper is located above the isolation area. Through the U-shaped reciprocating motion, the waste residue is regularly scraped into the slag discharge tank for discharge to achieve the effect of sewage purification. The existing air flotation scraper has the following problems during use: Air flotation scraper generally uses a scraper plate to scrape off the scum layer. The scraper plate is usually an integral plate. The scraper plate is driven by a conveying device to move to the scum discharge trough position, so that the free end of the scraper plate is tilted downward, and the sewage and scum on the scraper plate are automatically drained. However, in the actual operation process, a lot of scum will still remain on the surface of the scraper plate, which will enter the sewage pool for the second time, reducing the water purification effect.

[0004] Therefore, it is necessary to provide an industrial wastewater treatment equipment to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide an industrial wastewater treatment device to solve the defects of the prior art mentioned in the above background technology, that is, a lot of scum will still remain on the surface of the scraper plate, which will enter the sewage pool for the second time and reduce the water purification effect.

[0006] Based on the above ideas, the present invention provides the following technical solutions: it includes a conveying device located at the top of the sewage pool, wherein a plurality of connecting plates are installed on the conveying device at equal intervals, and a rotating rod is arranged inside the connecting plate on a side away from the conveying device, and both ends of the rotating rod extend to the outside of the connecting plate, and a scraping plate is fixedly connected to the outside of the rotating rod, and by rotating the rotating rod, the connecting plate and the scraping plate form an angle of 180 degrees or 90 degrees; a cleaning plate is sleeved on the outside of the scraping plate, and the inner side wall of the cleaning plate contacts the outer wall of the scraping plate, and the cross-sectional shape of the cleaning plate is set to be a U-shape, and by rotating the rotating rod, the angle between the connecting plate and the scraping plate is switched from 180 degrees to 90 degrees, and the cleaning plate moves in a direction away from the connecting plate to scrape off the scum on the surface of the scraping plate; the angle between the connecting plate and the scraping plate is switched from 90 degrees to 180 degrees, and the cleaning plate moves in a direction close to the connecting plate to reset.

[0007] As a further solution of the present invention: a transmission assembly and a linkage assembly are arranged on the outer side of the rotating rod, and the linkage assembly is arranged on the side of the transmission assembly close to the connecting plate; the transmission assembly includes two gears and two racks, the two gears are fixedly connected to the outer sides of the two ends of the rotating rod, and the two racks are symmetrically fixedly installed on the surface of the sewage pool, and the gears are meshed and connected with the racks; the connecting plate and the rotating rod are connected by a torsion spring.

[0008] As a further solution of the present invention: the linkage assembly includes two discs, and the two discs are respectively fixedly connected to the outer sides of the two ends of the rotating rod. The discs are provided with sliding grooves, and a sliding rod is slidably connected in the sliding grooves, and the other end of the sliding rod is fixed to the cleaning plate.

[0009] As a further solution of the present invention: a clamping assembly is arranged inside the rotating rod, and the clamping assembly includes a push rod, which is slidably connected to the inside of the rotating rod, and grooves are provided inside the rotating rod and the connecting plate, and the two grooves are connected to form a clamping groove, and a clamping block is clamped in the clamping groove, and the clamping block is connected to the inner wall of the rotating rod by a spring; the cross-sectional shape of the clamping block is set to be L-shaped, and the ends of the clamping block and the push rod that are close to each other are set to be arc surfaces, and the other end of the push rod is also set to be an arc surface; an extrusion block is fixedly connected to one side of one of the racks, and one end of the extrusion block is set to be an arc surface.

[0010] As a further solution of the present invention: the connecting plate and the rotating rod are connected or separated by horizontally moving the push rod toward the clamping block.

[0011] As a further solution of the present invention: an airbag is embedded in one end of the scraper plate away from the connecting plate, a first pipe is installed inside the scraper plate, the first pipe is made of stainless steel, and a gas safety valve is installed on the outside of the first pipe; one end of the first pipe is connected to a gas cylinder, the other end of the first pipe is connected to the airbag, and the gas cylinder is fixedly connected to the scraper plate; a piston is sealed and slidably provided inside the gas cylinder, and one end of the piston is fixed to the cleaning plate.

[0012] As a further solution of the present invention, by opening the gas safety valve, the compressed gas is instantly filled into the airbag, the airbag expands instantly, and the scum on the surface of the airbag and the side wall of the cleaning plate is removed.

[0013] As a further solution of the present invention: a second pipe is installed inside the scraper plate, two ends of the second pipe are respectively connected to the air cylinder and the air bag, and a one-way control valve is installed outside the second pipe.

[0014] Compared with the prior art, the beneficial effect of the present invention is that in the path of the first quarter circle of the scraper plate moving upward, the angle between the connecting plate and the scraper plate is always maintained at 180 degrees. At this time, the free end of the scraper plate is always kept tilted downward, so that the sewage and scum on the surface of the scraper plate can be initially and automatically drained, so that the scum is more concentrated and easy to handle. When the scraper plate moves up to the second quarter circle, the rotating rod is driven to rotate through the setting of the transmission component, so that the connecting plate and the scraper plate form an angle of 90 degrees, so that the free end of the scraper plate is still always kept tilted downward, so as to avoid residual sewage and scum on the scraper plate from dripping onto the conveying device, and then flowing back from the conveying device to the sewage pool for a second time, thereby improving the water purification effect. Through the cooperation of the transmission component and the linkage component, the cleaning plate in the shape of a U is driven to move, and the scum on the surface of the scraper plate is scraped off, thereby further improving the water purification effect.

[0015] Compared with the prior art, the beneficial effect of the present invention is that, through the cooperation of the transmission assembly and the clamping assembly, the push rod is moved horizontally, the connecting plate and the rotating rod are connected or separated, and the stability of the scraper plate in scraping scum inside the sewage pool is improved.

[0016] Compared with the prior art, the beneficial effect of the present invention is that, through the arrangement of the gas safety valve and the first pipeline, the compressed gas instantly fills the airbag, the airbag instantly expands, and the scum on the surface of the airbag and the surface of the cleaning plate is completely removed. At the same time, the free end of the scraper plate is far away from the sewage pool, and the scum will not be ejected into the sewage pool, which not only prevents the scum from sticking to the surface of the scraper plate again when the cleaning plate is reset, but also can clean the scum on the surface of the end of the scraper plate that contacts the sewage pool, thereby further improving the scum cleaning effect and improving the water purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a main structural schematic diagram of the present invention; Figure 2 It is a side structural schematic diagram of the present invention; Figure 3 It is a structural schematic diagram of the scraper plate of the present invention; Figure 4 It is a schematic diagram of the structure of the cleaning plate of the present invention; Figure 5 It is a schematic diagram of the structure of the connecting plate of the present invention; Figure 6 It is a schematic diagram of the structure of the clamping assembly of the present invention; Figure 7 The present invention Figure 2 A magnified view of the structure of part A; Figure 8 It is a schematic diagram of the structure of the gas cylinder of the present invention; Fig. 9 It is a schematic diagram of the first pipeline structure of the present invention.

[0019] In the figure: 1. conveying device; 2. connecting plate; 3. scraper plate; 4. cleaning plate; 5. transmission assembly; 501. gear; 502. rack; 503. torsion spring; 6. linkage assembly; 601. disc; 602. slide groove; 603. slide rod; 7. clamping assembly; 701. push rod; 702. extrusion block; 703. clamping block; 704. spring; 8. air cylinder; 801. piston; 802. first pipeline; 803. second pipeline; 9. air bag; 10. rotating rod. DETAILED DESCRIPTION

[0020] Embodiment 1, as Figures 1 to 4 As shown, an industrial wastewater treatment equipment includes a conveying device 1 located at the top of a sewage pool, and a plurality of connecting plates 2 are installed on the conveying device 1 at equal intervals. The conveying device 1 includes a driving motor, a transmission roller, a sprocket, and a chain. The sprocket is driven to rotate by the driving motor, and a plurality of connecting plates 2 are fixedly installed on the surface of the chain. The plurality of connecting plates 2 are driven to follow the movement of the chain through the cooperation of the sprocket and the chain. A rotating rod 10 is arranged inside the connecting plate 2 on the side away from the conveying device 1, and both ends of the rotating rod 10 extend to the outside of the connecting plate 2, and a scraping plate 3 is fixedly connected to the outside of the rotating rod 10; a cleaning plate 4 is sleeved on the outside of the scraping plate 3, and the inner wall of the cleaning plate 4 is in contact with the outer wall of the scraping plate 3, and the cross-sectional shape of the cleaning plate 4 is set to be a U-shape.

[0021] When the slag scraper 3 is moved upward, the slag scraper 3 is moved upward, and the slag scraper 3 moves ... downward, and the slag scraper 3 moves downward, and the slag scraper 3 moves downward, and the slag scraper 3 moves downward, and the slag scraper 3 moves downward, and the slag scraper 3 moves downward, and the slag scraper 3 moves upward, and the slag scraper 3 moves downward, and the slag scraper 3 moves downward, and the slag scraper 3 moves upward, and the slag scraper 3 moves downward, and the slag scraper 3 moves upward, and the slag scraper 3 moves downward, and the slag scraper 3 moves upward, and the slag scraper 3 moves downward, and the slag scraper 3 moves upward, and the slag scraper 3 moves upward, and the slag scraper 3 moves downward, and the slag scraper 3 moves upward, and the slag scraper 3 moves upward, and the slag scraper 3 moves upward, and the slag scraper 3 moves upward, and the slag scraper 3 moves upward, and the slag scraper 3 moves upward, and the slag scraper 3 moves upward, and the slag scraper 3 moves upward, and the slag scraper 3 moves upward, and the slag scrap The scraper plate 3 moves to the second quarter circle, and the connecting plate 2 and the scraper plate 3 form an angle of 90 degrees by rotating the rotating rod 10, so that the free end of the scraper plate 3 is still always tilted downward to prevent the residual sewage and scum on the scraper plate 3 from dripping onto the conveying device 1 and then flowing back to the sewage pool from the conveying device 1. During the process of the angle between the connecting plate 2 and the scraper plate 3 switching from 180 degrees to 90 degrees, the cleaning plate 4 moves in the direction away from the connecting plate 2 to scrape off the scum on the surface of the scraper plate 3, and just collects the scum into the scum collecting tank. The scum on the surface of the scraper plate 3 should be cleaned in the second quarter circle. After the scum on the surface of the scraper plate 3 is cleaned, the connecting plate 2 and the scraper plate 3 form an angle of 180 degrees to reset, and the angle between the connecting plate 2 and the scraper plate 3 switches from 90 degrees to 180 degrees, and the cleaning plate 4 moves in the direction close to the connecting plate 2 to reset.

[0022] like Figures 5 to 7 As shown, as the specific structure in this embodiment, a transmission component 5 and a linkage component 6 are arranged on the outer side of the rotating rod 10, and the linkage component 6 is arranged on the side of the transmission component 5 close to the connecting plate 2; the transmission component 5 includes two gears 501 and two racks 502, the two gears 501 are fixedly connected to the outer sides of the two ends of the rotating rod 10, and the two racks 502 are symmetrically fixedly installed on the surface of the sewage pool, and the gears 501 are meshed and connected with the racks 502; the connecting plate 2 and the rotating rod 10 are connected by a torsion spring 503.

[0023] In this embodiment, the rotating rod 10 is driven to rotate by the transmission assembly 5. When the scraper plate 3 moves upward in a circular motion along the transmission roller as the center after scraping the scum in the sewage pool, the rotating rod 10 moves together with the scraper plate 3. At this time, since a rack 502 with an arc-shaped cross-section is arranged on the circumference of the upper end of the sewage pool with the transmission roller as the center, and the position of the rack 502 is located on the circumference of the second quarter circle, when the gear 501 moves in a circular motion along the transmission roller as the center, the gear 501 rotates under the meshing force of the rack 502, and the rotation of the gear 501 drives the rotating rod 10 to overcome the force of the torsion spring 503 and rotate. Figure 3 , Figure 4 As shown, the angle between the connecting plate 2 and the scraping plate 3 is changed from 180 degrees to 90 degrees, and when the connecting plate 2 and the scraping plate 3 are switched; When the gear 501 is disengaged from the rack 502, the gear 501 is reset under the action of the torsion spring 503, and the reset of the gear 501 drives the rotating rod 10 to reset, and the reset of the rotating rod 10 drives the scraper plate 3 to reset, so that the angle between the connecting plate 2 and the scraper plate 3 changes from 90 degrees to 180 degrees.

[0024] like Figure 4 As shown, as the specific structure in this embodiment, the linkage assembly 6 includes two disks 601, and the two disks 601 are respectively fixedly connected to the outer sides of the two ends of the rotating rod 10, and a sliding groove 602 is opened on the disk 601. A sliding rod 603 is slidably connected in the sliding groove 602, and the other end of the sliding rod 603 is fixed to the cleaning plate 4.

[0025] In this embodiment, the rotation of the rotating rod 10 drives the linkage assembly 6 to rotate at the same time. The rotation of the linkage assembly 6 drives one end of the sliding rod 603 to slide along the inside of the slide groove 602. The sliding of the sliding rod 603 drives the cleaning plate 4 to slide along the surface of the scraper plate 3 to clean the scum on the surface of the scraper plate 3. When the rotating rod 10 is reversed and reset, the cleaning plate 4 is reset.

[0026] Furthermore, if Figure 6 to Figure 7 As shown, a clamping assembly 7 is provided inside the rotating rod 10, and the clamping assembly 7 includes a push rod 701, which is slidably connected to the inside of the rotating rod 10. Grooves are provided inside the rotating rod 10 and the connecting plate 2, and the two grooves are connected to form a clamping groove, in which a clamping block 703 is clamped, and the clamping block 703 is connected to the inner wall of the rotating rod 10 through a spring 704; the cross-sectional shape of the clamping block 703 is set to be L-shaped, and the ends of the clamping block 703 and the push rod 701 that are close to each other are both set to an arc surface, and the other end of the push rod 701 is also set to an arc surface; one side of one of the racks 502 is fixedly connected to an extrusion block 702, and one end of the extrusion block 702 is set to a arc surface. At this time, the number of torsion springs 503 is set to two, which are respectively set inside the two ends of the connecting plate 2.

[0027] In this embodiment, in order to improve the stability of the scraper plate 3 under the chain to scrape the scum, a squeezing block 702 with an arc surface is installed on one side of the rack 502. When the rotating rod 10 moves to the circumference of the circle with the transmission roller as the center, the push rod 701 inside the rotating rod 10 is squeezed by the squeezing block 702 and moves toward the direction of the clamping block 703, so that the clamping block 703 overcomes the force of the spring 704 under the squeezing of the push rod 701 and moves toward a position away from the clamping groove, so that the connecting plate 2 and the rotating rod 10 are separated, which means that the connecting plate 2 is separated from the scraper plate 3. When the connecting plate 2 is separated from the rotating rod 10, the gear 501 is meshed with the rack 502, so that the angle between the connecting plate 2 and the scraper plate 3 is switched from 180 degrees to 90 degrees, and the scum on the surface of the scraper plate 3 is cleaned; After the scum cleaning is completed, the rotating rod 10 is reset under the force of the torsion spring 503. At the same time, the block 703 is again inserted into the slot under the force of the spring 704, so that the connecting plate 2 and the rotating rod 10 are connected, which means that the connecting plate 2 and the scraper plate 3 are fixed, thereby improving the stability of the scraper plate 3 in scraping the scum inside the sewage pool.

[0028] Embodiment 2, as Figures 8 to 9 As shown, an air bag 9 is embedded in one end of the scraper plate 3 away from the connecting plate 2, a first pipe 802 is installed inside the scraper plate 3, the first pipe 802 is made of stainless steel, and a gas safety valve is installed on the outside of the first pipe 802; one end of the first pipe 802 is connected to the air cylinder 8, and the other end of the first pipe 802 is connected to the air bag 9, and the air cylinder 8 is fixedly connected to the scraper plate 3; a piston 801 is sealed and slidably inside the air cylinder 8, and one end of the piston 801 is fixed to the cleaning plate 4.

[0029] In this embodiment, when the angle between the connecting plate 2 and the scraper plate 3 is switched from 180 degrees to 90 degrees, and the cleaning plate 4 moves along the surface of the scraper plate 3, the movement of the cleaning plate 4 drives the piston 801 to move, compressing the gas inside the first pipeline 802. The gas safety valve is in a normally closed state under normal circumstances. At this time, the valve disc or valve core is pressed tightly against the valve seat under the action of the spring force or other loading mechanism to form a seal to prevent the medium from flowing out. When the gas pressure in the first pipeline 802 exceeds the set value of the gas safety valve, the force of the gas on the valve disc increases. When this force exceeds the force of the loading mechanism on the valve disc, the space between the valve disc and the valve seat The seal is broken, the valve disc leaves the valve seat, the gas safety valve opens, and the position of the cleaning plate 4 is exactly level with the end of the scraper plate 3. The gas safety valve opens, causing the compressed gas to instantly fill the airbag 9, and the airbag 9 expands instantly, and the scum remaining on the surface of the cleaning plate 4 when the surface of the airbag 9 and the cleaning plate 4 scrapes the scum on the surface of the scraper plate 3 is completely removed. At the same time, the free end of the scraper plate 3 is far away from the sewage pool, and the scum will not be ejected into the sewage pool, which not only prevents the scum from sticking to the surface of the scraper plate 3 again when the cleaning plate 4 is reset, but also can clean the scum on the surface of the end of the scraper plate 3 that contacts the sewage pool, thereby further improving the scum cleaning effect.

[0030] Furthermore, a second pipe 803 is installed inside the scraper plate 3, and both ends of the second pipe 803 are respectively connected to the air cylinder 8 and the air bag 9. A one-way control valve is installed outside the second pipe 803, and the one-way air intake valve only allows the gas inside the air bag 9 to be sucked into the air cylinder 8.

[0031] In this embodiment, when the cleaning plate 4 is reset, the cleaning plate 4 drives the piston 801 to move, and the movement of the piston 801 sucks the gas inside the airbag 9 into the air cylinder 8 through the second pipe 803, so that the airbag 9 is reset and embedded in the end of the scraping plate 3 away from the connecting plate 2; Before the cleaning plate 4 is reset, the gas safety valve is automatically closed after the pressure is released.

[0032] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An industrial wastewater treatment equipment, characterized in that: The invention comprises a conveying device (1) located at the top of a sewage pool, wherein a plurality of connecting plates (2) are installed on the conveying device (1) at equal intervals, wherein a rotating rod (10) is arranged inside the connecting plate (2) on a side away from the conveying device (1), wherein both ends of the rotating rod (10) extend to the outside of the connecting plate (2), and a scraping plate (3) is fixedly connected to the outside of the rotating rod (10), and by rotating the rotating rod (10), the connecting plate (2) and the scraping plate (3) form an angle of 180 degrees or an angle of 90 degrees; A cleaning plate (4) is sleeved on the outer side of the scraping plate (3), and the inner side wall of the cleaning plate (4) contacts the outer wall of the scraping plate (3). The cross-sectional shape of the cleaning plate (4) is set to be a U-shaped shape. By rotating the rotating rod (10), the angle between the connecting plate (2) and the scraping plate (3) is switched from 180 degrees to 90 degrees. The cleaning plate (4) moves in a direction away from the connecting plate (2) to scrape off the scum on the surface of the scraping plate (3). The angle between the connecting plate (2) and the scraping plate (3) is switched from 90 degrees to 180 degrees, and the cleaning plate (4) is moved toward the connecting plate (2) to reset.

2. The industrial wastewater treatment equipment according to claim 1, characterized in that: A transmission assembly (5) and a linkage assembly (6) are arranged on the outer side of the rotating rod (10); the linkage assembly (6) is arranged on a side of the transmission assembly (5) close to the connecting plate (2); The transmission assembly (5) comprises two gears (501) and two racks (502), the two gears (501) being fixedly connected to the outer sides of both ends of the rotating rod (10), the two racks (502) being symmetrically fixedly installed on the surface of the sewage pool, and the gears (501) being meshingly connected with the racks (502); The connecting plate (2) is connected to the rotating rod (10) via a torsion spring (503).

3. The industrial wastewater treatment equipment according to claim 2 is characterized in that: The linkage assembly (6) comprises two discs (601), the two discs (601) being fixedly connected to the outer sides of both ends of the rotating rod (10), respectively, the discs (601) being provided with a sliding groove (602), a sliding rod (603) being slidably connected in the sliding groove (602), and the other end of the sliding rod (603) being fixed to the cleaning plate (4).

4. The industrial wastewater treatment equipment according to claim 3 is characterized in that: A clamping assembly (7) is provided inside the rotating rod (10), the clamping assembly (7) comprising a push rod (701), the push rod (701) being slidably connected to the inside of the rotating rod (10), the inside of the rotating rod (10) and the connecting plate (2) both being provided with grooves, the two grooves being connected to form a clamping groove, a clamping block (703) being clamped in the clamping groove, the clamping block (703) being connected to the inner wall of the rotating rod (10) via a spring (704); The cross-sectional shape of the clamping block (703) is set to be L-shaped, the ends of the clamping block (703) and the push rod (701) that are close to each other are both set to be arc surfaces, and the other end of the push rod (701) is also set to be an arc surface; One side of one of the racks (502) is fixedly connected to an extrusion block (702), and one end of the extrusion block (702) is arranged as a curved surface.

5. The industrial wastewater treatment equipment according to claim 4 is characterized in that: The push rod (701) is moved horizontally toward the clamping block (703) to connect or separate the connecting plate (2) and the rotating rod (10).

6. The industrial wastewater treatment equipment according to claim 1, characterized in that: An air bag (9) is embedded in one end of the scraper plate (3) away from the connecting plate (2); a first pipe (802) is installed inside the scraper plate (3); the first pipe (802) is made of stainless steel; and a gas safety valve is installed outside the first pipe (802); One end of the first pipe (802) is connected to an air cylinder (8), and the other end of the first pipe (802) is connected to an air bag (9); the air cylinder (8) is fixedly connected to the scraper plate (3); A piston (801) is sealingly slidably disposed inside the gas cylinder (8), and one end of the piston (801) is fixed to the cleaning plate (4).

7. The industrial wastewater treatment equipment according to claim 6 is characterized by: By opening the gas safety valve, compressed gas is instantly filled into the airbag (9), the airbag (9) expands instantly, and the scum on the surface of the airbag (9) and the side wall of the cleaning plate (4) is removed.

8. The industrial wastewater treatment equipment according to claim 7, characterized in that: A second pipe (803) is installed inside the scraper plate (3), two ends of the second pipe (803) are respectively connected to the air cylinder (8) and the air bag (9), and a one-way control valve is installed outside the second pipe (803).

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