Composite water filtering capillary and water filtering device

Abstract

The application discloses a novel composite water filtering capillary and a water filtering device, and belongs to the technical field of water filtering devices.The water filtering device comprises a machine body, a water storage tank and a water accumulation cavity are reserved in the machine body, a plurality of parallel drainage ditches are arranged between the water accumulation cavity and the water storage tank, and an opening is reserved on the water storage tank.The application solves the problem that the existing water filtering device needs to directly exert a great pressure on a filtering net in order to improve water passing efficiency, so that the equipment structure needs to have great strength, resulting in high manufacturing cost, and high impurities on the filtering net are difficult to clean, so that the filtering net needs to be directly removed, resulting in suspension of water filtering work, reduction of benefits and high maintenance cost.In the application, the shape of the water filtering pipe is increased, impurities are more trapped, the movement direction of the water to be filtered is constantly changed, and the water to be filtered and the inner wall of the water filtering pipe have more impact.

Description

Technical Field

[0001] This invention belongs to the technical field of water filtration devices, specifically relating to a composite water filtration capillary and a water filtration device. Background Technology

[0002] The water filtration device is a water purification equipment used in natural water purification plants. It can be combined with equipment such as coagulation sedimentation tanks and sand filters. This type of equipment is generally large in scale.

[0003] Existing water filtration devices mostly use filter screens for filtration. This filtration method requires the filter screen to directly intercept the water flow path and trap impurities in the water to clean it. In order to improve the water flow efficiency, this method requires applying huge pressure directly to the filter screen, which requires the equipment structure to have great strength, resulting in high manufacturing costs. Furthermore, the high level of impurities on the filter screen is difficult to clean, requiring the direct removal of the filter screen, which leads to the suspension of water filtration, resulting in reduced revenue and high maintenance costs. Therefore, a composite water filter capillary tube and water filtration device are proposed. Summary of the Invention

[0004] This invention provides a composite water filter capillary and a water filtration device, which aims to solve the problems of existing water filtration devices that mostly use filter screens for filtration. This filtration method requires the filter screen to directly intercept the water liquid channel and trap impurities in the water to clean the water. In order to improve the water liquid throughput efficiency, this method requires a huge pressure to be applied directly to the filter screen, which requires the equipment structure to have great strength, resulting in high manufacturing costs. Furthermore, the high level of impurities on the filter screen is difficult to clean, requiring the direct removal of the filter screen, which leads to the suspension of water filtration, resulting in reduced revenue and high maintenance costs.

[0005] The present invention provides a composite water filter capillary and water filter device, including a body, characterized in that the body has a water tank and a water collection chamber reserved inside, a plurality of parallel drainage ditches are provided between the water collection chamber and the water tank, the water tank has an opening reserved, and the opening of the water tank is movably covered by a cover plate.

[0006] Several limiting posts are installed on the inner side of the water tank. Several filter pipes are also arranged on the water tank. Each filter pipe weaves in a wave shape between the limiting posts located on the same horizontal line. Each end of the filter pipe is connected to a water tank through a water inlet pipe. Each end of the water tank is provided with a branch pipe. An electric cylinder is connected between the branch pipe and the machine body. The fixed end of the electric cylinder is fixedly connected to the machine body, and the movable end of the electric cylinder is fixedly connected to the branch pipe. An adjustment component is connected to the limiting post. The bottom of the water accumulation chamber is funnel-shaped, and a drain pipe is provided in the middle of the bottom of the funnel. A cavity is opened on the inner side of the water tank. The cavity is connected to the branch pipe and the water inlet pipe. Each branch pipe on the water tank is connected to a water pipe.

[0007] Furthermore, a water-blocking plate is slidably connected to the top of the water-accumulating cavity, and a matching groove is formed on the water-blocking plate. The matching groove is parallel to the drainage ditch, and the width of the matching groove is greater than that of the drainage ditch.

[0008] By adopting the above scheme, the drainage ditch and the connecting ditch correspond to each other, allowing water to flow smoothly through the drainage ditch and the connecting ditch in sequence, so that it can reach the inside of the water accumulation chamber from the inside of the drainage ditch.

[0009] Furthermore, the water-blocking plate has several connecting grooves on the side facing the drainage ditch, and a blocking block is provided in the connecting groove. The blocking block is made of rubber. The mating groove and the connecting groove are distributed alternately, and the blocking block and the drainage ditch are movably connected.

[0010] By adopting the above scheme, the water-blocking plate and the drainage ditch move relative to each other, so that the blocking block on the water-blocking plate corresponds to the drainage ditch, thereby blocking the drainage ditch and preventing water from entering the water accumulation chamber through the drainage ditch via the water tank.

[0011] Furthermore, a mating groove is provided in the middle of the cover plate, and several grooves are provided on the edge portions on both sides of the cover plate, the grooves being mated with the water filter pipe.

[0012] By adopting the above solution, the groove on the cover plate matches the machine body and can be used to lock the water filter pipe.

[0013] Furthermore, a side bracket is provided on each side of the machine body. The side bracket is L-shaped, and the water inlet pipe passes through the side bracket.

[0014] By adopting the above solution, the side bracket and the water inlet pipe can be used together to help straighten the filter pipe.

[0015] Furthermore, the bottom of the water tank is provided with several limiting blocks, and the bottom of the side bracket is provided with several limiting rods. The limiting rods and limiting blocks correspond one-to-one, and the limiting rods and limiting blocks can be movably inserted into each other.

[0016] By adopting the above scheme, the combined use of the limiting block and the limiting rod can make the movement of the water tank more stable.

[0017] Furthermore, a limiting groove is recessed on the outer side of the limiting post, and the limiting groove is movably connected to the outer side of the filter pipe.

[0018] By adopting the above scheme, the limiting groove enhances the limiting column's function of restricting the water filter pipe.

[0019] Furthermore, the adjustment assembly includes a first connecting arm, a second connecting arm, a hinge plate, and a limiting post. A sliding cavity is provided on the inner side of the body, and a sliding plate is slidably connected to the inner side of the sliding cavity. The top end of the sliding plate is fixedly connected to the bottom end of the limiting post. A hinge plate is provided on the limiting post, and the second connecting arm is rotatably connected to the hinge plate. The top end of the second connecting arm is rotatably connected to the first connecting arm, and the top end of the first connecting arm is fixedly connected to the cover plate.

[0020] By adopting the above scheme, when the cover plate rises, it can carry the first connecting arm upwards. The first connecting arm pulls the second connecting arm to swing. The bottom end of the second connecting arm moves with the limiting post, causing the limiting groove on the limiting post to separate from the filter pipe. Finally, the obstruction of the limiting post to the filter pipe is removed. The water tank pulls both ends of the filter pipe to move to both sides of the machine body through the water inlet pipe, making the filter pipe straight. This greatly reduces the obstruction of the filter pipe to the internal fluid, so that high-pressure water can be used to flush the inner wall of the filter pipe, allowing the trapped impurities to be flushed out smoothly.

[0021] Furthermore, a control rod is provided at the top of the side bracket, and a connecting plate is provided at each end of the cover plate. An inclined track is provided on the connecting plate, and a sliding column is provided at the top of the control rod, which extends into the inclined track for sliding connection.

[0022] By adopting the above scheme, when the movable end of the electric cylinder extends, the electric cylinder can move the water tank away from the machine body through the branch pipe. The water tank can move the sliding column through the control rod. The sliding column presses against the inner wall of the inclined plate, causing the connecting plate to rise with the cover plate.

[0023] Furthermore, the filter pipe is a composite filter capillary tube, comprising a corrugated pipe, filter holes, a filter cloth sleeve, a binding layer, and clamping rings. The filter holes have a plurality of filter holes. The filter cloth sleeve is fitted onto the outside of the corrugated pipe. The binding layer is woven from polyester yarn and the clamping rings are fitted onto the outside of the binding layer. The clamping rings are made of rubber.

[0024] By adopting the above scheme, water to be filtered is introduced into one end of the water pipe. The shape of the filter pipe increases the obstruction to the water to be filtered, trapping more impurities. At the same time, the direction of movement of the water to be filtered must be constantly changed, thus interacting more with the inner wall of the filter pipe. The water to be filtered in the filter pipe overflows through the filter holes and is filtered as it passes through the filter cloth sleeve to the outside of the filter pipe. The filtered water enters the water tank, flows along the limiting column to the inner bottom wall of the water tank, and then enters the water accumulation chamber through the drainage ditch.

[0025] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects:

[0026] In this invention, the shape of the filter tube increases the obstruction to the water to be filtered, trapping more impurities. At the same time, the direction of movement of the water to be filtered is constantly changed, causing more impact between the water to be filtered and the inner wall of the filter tube. Through the composite filter capillary, the water to be filtered overflows through the filter holes and is filtered as it passes through the filter cloth sleeve to the outside of the filter tube. This process does not require a high water pressure to be supplied to the filter tube. Because the shape of the filter tube has many bends, making it very long, the filter tube can have a large relative surface area for filtration, thus allowing the water to have more time to be filtered as it travels through the filter tube. The relative surface area refers to the ratio of surface area to volume.

[0027] In this invention, by adjusting the use of the components, when the movable end of the electric cylinder extends, the electric cylinder can move the water tank away from the machine body via the branch pipe. The water tank can move the sliding column via the control rod. The sliding column presses against the inner wall of the inclined plate, causing the connecting plate to rise with the cover plate. The cover plate moves the first connecting arm upwards, and the first connecting arm pulls the second connecting arm to swing. The bottom end of the second connecting arm moves with the limiting post, causing the limiting groove on the limiting post to separate from the filter pipe. Finally, the obstruction of the limiting post to the filter pipe is removed. The water tank pulls both ends of the filter pipe to move to both sides of the machine body via the water inlet pipe, straightening the filter pipe. This greatly reduces the obstruction of the filter pipe to the internal fluid. Then, high-pressure water is introduced into the filter pipe. The high-pressure water passes through the inner cavity of the filter pipe, allowing impurities inside the filter pipe to be smoothly flushed out, and the inner wall of the filter pipe is rinsed, thereby restoring the filter pipe's filtering capacity. This achieves the ability to quickly clean the filter pipe, thereby reducing the cost of use and maintenance.

[0028] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 This is a top view of the structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the front structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the linkage component structure of the present invention;

[0033] Figure 4 For the present invention Figure 1 A partially enlarged structural diagram of part A in the diagram;

[0034] Figure 5 This is a schematic diagram of the composition and structure of the water filter pipe of the present invention. Figure 1 ;

[0035] Figure 6 This is a schematic diagram of the composition and structure of the water filter pipe of the present invention. Figure 2 ;

[0036] Figure 7 This is a bottom view of the cover plate of the present invention.

[0037] Reference numerals: Body—1, Water tank—2, Water pipe—3, Filter pipe—4, Corrugated pipe—41, Filter hole—42, Filter cloth cover—43, Restraint layer—44, Hoop ring—45, Branch pipe—5, Water tank—6, Limiting block—7, Control rod—8, Water inlet pipe—9, Side support—10, Water blocking plate—11, Drainage ditch—12, Filter pipe—4, Limiting post—14, Electric cylinder—15, Limiting rod—16, Matching groove—17, Connecting groove—18, Blocking block—19, Cover plate—20, Connecting arm one—21, Connecting arm two—22, Hinge plate—23, Sliding plate—24, Limiting groove—25, Drain pipe—26, Water accumulation chamber—27, Linking plate—28, Inclined track—29, Sliding post—30. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] like Figure 1-7 As shown, the present invention proposes a composite water-filtering capillary and water-filtering device, including a body 1. The body 1 is characterized in that a water-holding tank 2 and a water-collecting cavity 27 are reserved inside the body 1. A plurality of parallel drainage ditches 12 are provided between the water-collecting cavity 27 and the water-holding tank 2. An opening is reserved on the water-holding tank 2. The opening of the water-holding tank 2 is movably covered by a cover plate 20.

[0040] Several limiting posts 14 are installed on the inner side of the water tank 2. Several filter pipes 4 are also arranged on the water tank 2. Each filter pipe 4 is wavy and shuttles between the limiting posts 14 located on the same horizontal line. Both ends of the filter pipe 4 are connected to a water tank 6 through a water inlet pipe 9. Both ends of the water tank 6 are provided with a branch pipe 5. An electric cylinder 15 is connected between the branch pipe 5 and the machine body 1. The fixed end of the electric cylinder 15 is fixedly connected to the machine body 1, and the movable end of the electric cylinder 15 is fixedly connected to the branch pipe 5. An adjustment component is connected to the limiting post 14. The bottom of the water accumulation cavity 27 is funnel-shaped. A drain pipe 26 is provided in the middle of the bottom of the funnel. A cavity is opened on the inner side of the water tank 6. The cavity is connected to the branch pipe 5 and the water inlet pipe 9. Each branch pipe 5 on the water tank 6 is connected to a water pipe 3.

[0041] A water-blocking plate 11 is slidably connected to the top of the water-collecting cavity 27. A matching groove 17 is provided on the water-blocking plate 11. The matching groove 17 is parallel to the drainage ditch 12. The width of the matching groove 17 is greater than that of the drainage ditch 12. The drainage ditch 12 and the matching groove 17 correspond to each other, so that the water can smoothly pass through the drainage ditch 12 and the matching groove 17 in sequence, and thus reach the inner side of the water-collecting cavity 27 from the inner side of the drainage ditch 12.

[0042] The water-blocking plate 11 has several connecting grooves 18 on the side facing the drainage ditch 12. A blocking block 19 is provided in the connecting groove 18. The blocking block 19 is made of rubber. The mating groove 17 and the connecting groove 18 are alternately distributed. The blocking block 19 and the drainage ditch 12 are movably connected. When the water-blocking plate 11 and the drainage ditch 12 move relative to each other, the blocking block 19 on the water-blocking plate 11 corresponds to the drainage ditch 12, thus blocking the drainage ditch 12. This prevents water from entering the water accumulation chamber 27 through the drainage ditch 12 via the water holding tank 2.

[0043] The cover plate 20 has a mating groove in the middle and several grooves on the edges of both sides of the cover plate 20. The grooves mate with the water filter pipe 4 and the grooves on the cover plate 20 mate with the body 1, which can be used to lock the water filter pipe 4.

[0044] A side bracket 10 is provided on each side of the body 1. The side bracket 10 is L-shaped. The water inlet pipe 9 passes through the side bracket 10. The side bracket 10 and the water inlet pipe 9 cooperate to help straighten the water filter pipe 4.

[0045] The bottom of the water tank 6 is provided with several limiting blocks 7, and the bottom of the side bracket 10 is provided with several limiting rods 16. The limiting rods 16 and the limiting blocks 7 correspond one-to-one. The limiting rods 16 and the limiting blocks 7 can be movably inserted. The cooperation between the limiting blocks 7 and the limiting rods 16 can make the movement of the water tank 6 more stable.

[0046] A limiting groove 25 is recessed on the outer side of the limiting post 14. The limiting groove 25 is movably connected to the outer side of the water filter pipe 4. The limiting groove 25 enhances the limiting function of the limiting post 14 on the water filter pipe 4.

[0047] The adjustment assembly includes a first connecting arm 21, a second connecting arm 22, a hinge plate 23, and a limiting post 14. A sliding cavity is formed on the inner side of the body 1. A sliding plate 24 is slidably connected to the inner side of the sliding cavity. The top end of the sliding plate 24 is fixedly connected to the bottom end of the limiting post 14. A hinge plate 23 is provided on the limiting post 14. The second connecting arm 22 is rotatably connected to the hinge plate 23. The top end of the second connecting arm 22 is rotatably connected to the first connecting arm 21. The top end of the first connecting arm 21 is fixedly connected to the cover plate 20. When the cover plate 20 rises… The connecting arm 21 can be moved upwards, and the connecting arm 21 pulls the connecting arm 22 to swing. The bottom end of the connecting arm 22 moves with the limiting post 14, so that the limiting groove 25 on the limiting post 14 separates from the filter pipe 4. Finally, the obstruction of the limiting post 14 to the filter pipe 4 is removed. The water tank 6 pulls the two ends of the filter pipe 4 to both sides of the machine body 1 through the water inlet pipe 9, so that the filter pipe 4 is straightened. This greatly reduces the obstruction of the filter pipe 4 to the internal fluid, so that high-pressure water can be used to flush the inner wall of the filter pipe 4, so that the trapped impurities can be flushed out smoothly.

[0048] A control rod 8 is provided at the top of the side support 10, and a connecting plate 28 is provided at each end of the cover plate 20. An inclined rail 29 is provided on the connecting plate 28. A sliding column 30 is provided at the top of the control rod 8. The sliding column 30 extends into the inclined rail 29 and is slidably connected. When the movable end of the electric cylinder 15 extends, the electric cylinder 15 can move the water tank 6 away from the machine body 1 through the branch pipe 5. The water tank 6 can move through the control rod 8 and the sliding column 30. The sliding column 30 presses against the inner wall of the inclined rail 29, causing the connecting plate 28 to rise with the cover plate 20.

[0049] The filter pipe 4 is a composite capillary filter pipe, comprising a corrugated pipe 41, filter holes 42, a filter cloth sleeve 43, a binding layer 44, and clamping rings 45. The filter holes 42 have multiple filter holes. The filter cloth sleeve 43 is fitted onto the outside of the corrugated pipe 41, and the binding layer 44, made of polyester yarn, is fitted onto the outside of the filter cloth sleeve 43. Several clamping rings 45, made of rubber, are fitted onto the outside of the binding layer 44. One end of the filter tube 3 is fed with water to be filtered. The shape of the filter tube 4 increases the obstruction to the water to be filtered, trapping more impurities. At the same time, the direction of movement of the water to be filtered must be constantly changed, so that it interacts more with the inner wall of the filter tube 4. The water to be filtered in the filter tube 4 overflows through the filter hole 42 and is filtered as it passes through the filter cloth sleeve 43 to the outside of the filter tube 4. The filtered water enters the water tank 2, flows along the limiting post 14 to the inner bottom wall of the water tank 2, and then enters the water accumulation chamber 27 through the drainage ditch 12.

[0050] The specific implementation method is as follows: water to be filtered is input into one end of the water pipe 3. The shape of the filter pipe 4 increases the obstruction to the water to be filtered, trapping more impurities. At the same time, the direction of movement of the water to be filtered must be constantly changed, so that the water to be filtered and the inner wall of the filter pipe 4 have more impact. The water to be filtered in the filter pipe 4 overflows through the filter hole 42 and is filtered as it reaches the outside of the filter pipe 4 through the filter cloth sleeve 43. The filtered water enters the water tank 2, flows along the limiting post 14 to the inner bottom wall of the water tank 2, and then enters the water accumulation chamber 27 through the drainage ditch 12.

[0051] When the movable end of the electric cylinder 15 extends, the electric cylinder 15 can move the water tank 6 away from the machine body 1 via the branch pipe 5. The water tank 6 can move the sliding column 30 via the control rod 8. The sliding column 30 presses against the inner wall of the inclined rail 29, causing the connecting plate 28 to rise along with the cover plate 20. The cover plate 20 moves the connecting arm 1 21 upwards. The connecting arm 1 21 pulls the connecting arm 22 to swing. The bottom end of the connecting arm 22 moves the limiting column 14, causing the limiting groove 2 on the limiting column 14 to move. 5. Separate from the filter pipe 4, and finally remove the obstruction of the filter pipe 4 by the limiting post 14. The water tank 6 pulls the two ends of the filter pipe 4 to the sides of the machine body 1 through the water inlet pipe 9, so that the filter pipe 4 is straightened, thereby greatly reducing the obstruction of the filter pipe 4 to the internal fluid. Then, high-pressure water is introduced into the filter pipe 4. The high-pressure water passes through the inner cavity of the filter pipe 4, so that the impurities in the filter pipe 4 are smoothly flushed out, and the inner wall of the filter pipe 4 is rinsed, thereby restoring the cleaning ability of the filter pipe 4.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A water filtering device comprising a body (1), characterized in that, The body (1) has a water tank (2) and a water accumulation chamber (27) inside. Several parallel drainage ditches (12) are provided between the water accumulation chamber (27) and the water tank (2). The water tank (2) has an opening, and the opening of the water tank (2) can be covered by a cover plate (20). Several limiting posts (14) are installed on the inner side of the water tank (2). Several filter pipes (4) are also arranged on the water tank (2). Each filter pipe (4) shuttles in a wave shape between the limiting posts (14) located on the same horizontal line. The two ends of the filter pipe (4) are connected to a water tank (6) through a water inlet pipe (9). A branch pipe (5) is provided at both ends of the water tank (6). An electric cylinder (15) is connected between the branch pipe (5) and the machine body (1). The fixed end of the electric cylinder (15) is fixedly connected to the machine body (1), and the movable end of the electric cylinder (15) is fixedly connected to the branch pipe (5). An adjustment component is connected to the limiting post (14). The limiting post (14) has a limiting groove (25) recessed on its outer side, and the limiting groove (25) is movably connected to the outer side of the filter pipe (4). The adjustment assembly includes a connecting arm 1 (21), a connecting arm 2 (22), a hinge plate (23), and a limiting post (14). A sliding cavity is provided on the inner side of the body (1). A sliding plate (24) is slidably connected to the inner side of the sliding cavity. The top end of the sliding plate (24) is fixedly connected to the bottom end of the limiting post (14). A hinge plate (23) is provided on the limiting post (14). The connecting arm 2 (22) is rotatably connected to the hinge plate (23). The top end of the connecting arm 2 (22) is rotatably connected to the connecting arm 1 (21). The top end of the connecting arm 1 (21) is fixedly connected to the cover plate (20). A control rod (8) is provided at the top of the side support (10), and a connecting plate (28) is provided at each end of the cover plate (20). An inclined rail (29) is provided on the connecting plate (28), and a sliding column (30) is provided at the top of the control rod (8). The sliding column (30) extends into the inclined rail (29) for sliding connection. The filter pipe (4) is a composite filter capillary tube. The filter pipe (4) includes a corrugated pipe (41), filter holes (42), filter cloth sleeve (43), binding layer (44) and clamping ring (45). The filter holes (42) are provided with a plurality of filter holes (42). The corrugated pipe (41) is fitted with a filter cloth sleeve (43) on the outside. The filter cloth sleeve (43) is fitted with a binding layer (44) on the outside. The binding layer (44) is made of polyester yarn. The binding layer (44) is fitted with a plurality of clamping rings (45) on the outside. The clamping rings (45) are made of rubber.

2. The water filter device of claim 1, wherein: A water-blocking plate (11) is slidably connected to the top of the water-accumulating cavity (27). A matching groove (17) is provided on the water-blocking plate (11). The matching groove (17) is parallel to the drainage ditch (12). The width of the matching groove (17) is greater than that of the drainage ditch (12).

3. The water filter device of claim 2, wherein: The water-blocking plate (11) has several connecting grooves (18) on the side facing the drainage ditch (12). A block (19) is provided in the connecting groove (18). The block (19) is made of rubber. The mating groove (17) and the connecting groove (18) are alternately distributed. The block (19) and the drainage ditch (12) are movably connected.

4. The water filter device of claim 1, wherein: The cover plate (20) has several grooves on its two sides, which are matched with the filter pipe (4).

5. The water filtration device according to claim 1, characterized in that: The body (1) is provided with a side bracket (10) on each side. The side bracket (10) is L-shaped and the water pipe (9) passes through the side bracket (10).

6. The water filter device of claim 5, wherein: The bottom of the water tank (6) is provided with several limiting blocks (7), and the bottom of the side bracket (10) is provided with several limiting rods (16). The limiting rods (16) and the limiting blocks (7) correspond one to one, and the limiting rods (16) and the limiting blocks (7) can be movably inserted.

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