Environment-friendly plastic-lined anticorrosive tank

Abstract

The utility model discloses an environmental protection plastic -lined anticorrosive tank relates to plastic -lined anticorrosive tank technical field, the utility model discloses a tank body still includes feed pipe, ring cover, sealing cover, sealing assembly, drive part and fixed component, and feed pipe fixed mounting is at one end of tank body, and the one end of feed pipe is provided with the mounting groove, and ring cover fixed mounting is at the one end of feed pipe away from tank body, the inner wall of feed pipe, and the position of being close to the pipe orifice is provided with a plurality of rectangular slots along the circumference equidistance, and sealing cover sets up at one side of ring cover, and the bottom of sealing cover is provided with a plurality of positioning hole along the circumference equidistance, and the one side of sealing cover is provided with the threaded hole, and sealing assembly sets up in the inside of feed pipe, and fixed component sets up at the one side of sealing cover close to feed pipe, can block the leakage of medium from the gap between feed pipe and fixed component through setting sealing assembly, realizes the sealing of feed pipe inside, prevents medium seepage, and ensures the sealing property and security when tank body stores medium.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic-lined anti-corrosion tanks, specifically to an environmentally friendly plastic-lined anti-corrosion tank. Background Technology

[0002] In the industrial production sector, corrosion-resistant tanks, as key equipment for storing corrosive, volatile, and other special media, are widely used in industries such as chemical, pharmaceutical, and environmental treatment. As industries continue to raise their requirements for production safety, media storage stability, and environmental compliance, the sealing performance of the inlet of corrosion-resistant tanks has become a core element in ensuring that media does not leak, avoiding resource waste and environmental risks, and directly affecting the overall operating efficiency and production safety of the equipment. Consequently, the industry's demand for the durability and reliability of the inlet sealing structure is also constantly increasing.

[0003] Existing corrosion-resistant tanks have sealing rings installed between the inlet and the cover. Because the cover is opened and closed via threads, it requires multiple turns, causing the sealing ring to rotate and rub against the inner wall of the inlet. This significantly reduces the lifespan of the sealing ring. After prolonged use, severely worn sealing rings cannot tightly seal the gap between the inlet and the cover, leading to media leakage. This not only necessitates frequent replacement of the sealing rings to maintain a tight seal, increasing equipment maintenance costs and downtime, but also risks the leakage corroding surrounding equipment, polluting the environment, and even posing safety hazards. Ultimately, this fails to meet the long-term, stable sealing requirements of industrial production for corrosion-resistant tanks. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides an environmentally friendly plastic-lined corrosion-resistant tank, which has the advantages of a sealing structure without rotational friction, stable and durable sealing effect, and long service life, thereby solving the problem of sealing ring failure and media leakage caused by rotational friction wear of traditional corrosion-resistant tanks.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: an environmentally friendly plastic-lined anti-corrosion tank, including a tank body, a feed pipe, an annular cover, a sealing cover, a sealing assembly, a driving unit, and a fixing assembly. The feed pipe is fixedly installed at one end of the tank body, and an installation groove is provided at one end of the feed pipe. The annular cover is fixedly installed at the end of the feed pipe away from the tank body. Several rectangular grooves are equidistantly provided along the circumference of the inner wall of the feed pipe near the pipe opening. The sealing cover is located on one side of the annular cover, and several positioning holes are equidistantly provided along the circumference of the bottom of the sealing cover. A threaded hole is provided on one side of the sealing cover. The sealing assembly is located inside the feed pipe. The driving unit is located inside the installation groove. The fixing assembly is located on the side of the sealing cover near the feed pipe. The sealing assembly and the fixing assembly are used in conjunction.

[0006] As a preferred technical solution of this utility model, the sealing assembly includes a U-shaped mounting ring, which is fixedly installed on the inner wall of the feed pipe near the tank body. The inner wall of the U-shaped mounting ring is provided with a plurality of mounting holes at equal intervals along the circumference, and the top of the U-shaped mounting ring is set with an inclined surface.

[0007] As a preferred technical solution of this utility model, the sealing assembly further includes an annular airbag, which is fixedly installed inside the U-shaped mounting ring. A vent pipe is fixedly installed on the side of the annular airbag near the mounting hole, and the other end of the vent pipe passes through the mounting hole and the feed pipe and is connected to the mounting groove.

[0008] As a preferred technical solution of this utility model, the driving part includes an annular piston, which is movably installed inside the mounting groove. Several push rods are fixedly installed on the side of the annular piston near the annular cover, and the other end of the push rods passes through the annular cover and is movably sleeved inside the positioning hole.

[0009] As a preferred technical solution of this utility model, the driving part further includes a plurality of springs, which are fixedly installed at equal intervals along the circumference on the side of the annular piston near the push rod. The other end of the spring is fixedly installed on one side of the annular cover, and the spring is movably sleeved on the outside of the push rod.

[0010] As a preferred technical solution of this utility model, the fixing component includes a convex rod, which is fixedly installed on the side of the sealing cover near the feed pipe. A sealing groove is provided on the outer side of the end of the convex rod away from the sealing cover, and the sealing groove is used in conjunction with the annular airbag.

[0011] As a preferred technical solution of this utility model, the fixing component further includes a movable groove, which is opened at one end of the convex rod near the sealing cover. The movable groove is connected to a threaded hole, and a pressing rod is threadedly connected inside the threaded hole. One end of the pressing rod is movably sleeved inside the movable groove, wherein the end of the pressing rod movably sleeved inside the movable groove is tapered.

[0012] As a preferred technical solution of this utility model, the fixing component further includes a plurality of sliding holes, which are equidistantly opened on the outside of the convex rod along the circumference. The position of the sliding holes corresponds to the position of the rectangular groove. The sliding holes are connected to the movable groove. A fixing rod is movably installed inside the sliding hole, and the other end of the fixing rod is movably sleeved inside the rectangular groove.

[0013] The beneficial effects of this utility model are as follows: This invention installs an annular airbag inside a U-shaped mounting ring, which is connected to the mounting groove of the feed pipe via a vent pipe. The annular piston of the drive unit can move flexibly within the mounting groove. When the annular piston moves closer to the vent pipe, it can compress the gas in the mounting groove. The gas enters the annular airbag through the vent pipe, causing the annular airbag to inflate and expand until it is tightly fitted with the sealing groove of the fixed component, thereby blocking the medium leakage channel and solving the problem that traditional sealing structures are prone to sealing failure due to wear or pressure changes.

[0014] The convex rod is fixed on the side of the sealing cap near the feed tube. The sealing groove on its outer side corresponds to the annular airbag, providing a close sealing contact surface after the annular airbag is inflated and expanded, making the seal tighter. The movable groove inside the convex rod is connected to the threaded hole. When the extrusion rod in the threaded hole is rotated, its conical end will push the fixed rod in the movable groove, so that the fixed rod extends along the sliding hole and is embedded in the rectangular groove of the feed tube, thereby firmly fixing the sealing cap and the feed tube. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an environmentally friendly plastic-lined anti-corrosion tank according to this utility model; Figure 2 This is a schematic diagram of the feed pipe structure of this utility model; Figure 3 This is a schematic diagram of the overall cross-sectional structure of the feed pipe and sealing cap of this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the feed pipe of this utility model; Figure 5 This is a schematic diagram of the annular airbag structure of this utility model; Figure 6 This is a schematic diagram of the drive component structure of this utility model; Figure 7 This is a schematic diagram of the sealing cap structure of this utility model; Figure 8 This is a schematic diagram of the cross-sectional structure of the convex rod of this utility model; Figure 9 This is a schematic diagram of the fixing rod structure of this utility model.

[0016] Reference numerals: 1. Tank body; 2. Feed pipe; 3. Mounting groove; 4. Annular cover; 5. Sealing cover; 6. Rectangular groove; 7. U-shaped mounting ring; 8. Mounting hole; 9. Vent pipe; 10. Annular air bladder; 11. Annular piston; 12. Push rod; 13. Spring; 14. Positioning hole; 15. Convex rod; 16. Sealing groove; 17. Threaded hole; 18. Movable groove; 19. Sliding hole; 20. Extrusion rod; 21. Fixed rod. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention may exceed the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but they still fall within the protection scope of this application.

[0018] Figures 1-9 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figure 1 -Appendix Figure 9 The present invention will be further described below.

[0019] An environmentally friendly plastic-lined corrosion-resistant tank includes a tank body 1, a feed pipe 2, an annular cover 4, a sealing cover 5, a sealing assembly, a driving unit, and a fixing assembly. The feed pipe 2 is fixedly installed at one end of the tank body 1, and an installation groove 3 is provided at one end of the feed pipe 2. The annular cover 4 is fixedly installed at the end of the feed pipe 2 away from the tank body 1. A plurality of rectangular grooves 6 are provided at equal intervals along the circumference on the inner wall of the feed pipe 2 near the pipe opening. The sealing cover 5 is located on one side of the annular cover 4. A plurality of positioning holes 14 are provided at equal intervals along the circumference on the bottom of the sealing cover 5. A threaded hole 17 is provided on one side of the sealing cover 5. The sealing assembly is located inside the feed pipe 2. The driving unit is located inside the installation groove 3. The fixing assembly is located on the side of the sealing cover 5 near the feed pipe 2.

[0020] In this implementation scheme, the tank body 1 is set as the core load-bearing component of the environmentally friendly plastic-lined anti-corrosion tank, serving as the main container for storing various media. Its plastic-lined structure can directly contact the media to be stored, providing basic anti-corrosion protection. Simultaneously, it provides a fixed installation base for the feed pipe 2, one end of which is fixedly installed on the tank body 1, serving as the dedicated channel for the media to enter the tank body 1. It also provides a fixed installation position for the annular cover 4. An internal mounting groove 3 accommodates the drive unit. A rectangular groove 6 on the inner wall near the pipe opening engages with the fixing rod 21 in the fixing assembly, securing the sealing cover 5 to the feed pipe 2. The annular cover 4 is fixedly installed at the end of the feed pipe 2 furthest from the tank body 1, protecting the drive unit inside the mounting groove 3. The sealing cover 5 can close the opening of the feed pipe 2 through the fixing assembly. Positioning holes 14 are equidistantly located at the bottom of the sealing cover 5 along the circumference, corresponding to the drive unit. The push rod 12 is fitted together. When the sealing cover 5 is installed, the push rod 12 is inserted into the positioning hole 14. At the same time, pressure is applied to the push rod 12 through the positioning hole 14, triggering the drive unit to move. The threaded hole 17 is opened on one side of the sealing cover 5 and cooperates with the extrusion rod 20 of the fixing component to provide a threaded mounting base for the extrusion rod 20. The sealing component can block the leakage of the medium from the gap between the feed pipe 2 and the fixing component, realize the internal sealing of the feed pipe 2, prevent the medium from leaking, and ensure the sealing performance and safety of the tank 1 when storing the medium. The drive unit is set inside the mounting groove 3. It pushes the sealing component to realize the sealing action through the movement of its own components. The fixing component cooperates with the rectangular groove 6 of the feed pipe 2 to fix the sealing cover 5 and the feed pipe 2, prevent the sealing cover 5 from shifting under the action of medium pressure, and at the same time provide a close sealing contact surface for the sealing component to ensure that the sealing component can effectively achieve sealing.

[0021] Specifically, the sealing assembly includes a U-shaped mounting ring 7, which is fixedly installed on the inner wall of the feed pipe 2 near the end of the tank 1. The inner wall of the U-shaped mounting ring 7 is provided with a plurality of mounting holes 8 at equal intervals along the circumference, and the top of the U-shaped mounting ring 7 is set with an inclined surface. The sealing assembly also includes an annular airbag 10, which is fixedly installed inside the U-shaped mounting ring 7. A vent pipe 9 is fixedly installed on the side of the annular airbag 10 near the mounting hole 8. The other end of the vent pipe 9 passes through the mounting hole 8 and the feed pipe 2 and is connected to the mounting groove 3.

[0022] In this embodiment, by fixing the U-shaped mounting ring 7 to the inner wall of the feed pipe 2 near the tank 1, a stable mounting carrier is provided for the annular airbag 10, ensuring that the annular airbag 10 is fixed in position inside the feed pipe 2 and preventing displacement of the annular airbag 10 due to medium flow or equipment vibration. Several mounting holes 8 opened on the inner wall provide a through channel for the vent pipe 9, allowing the vent pipe 9 to smoothly connect the annular airbag 10 and the mounting groove 3, ensuring a smooth gas transmission path. The top is set with a slope, which can reduce the flow resistance of the medium when it enters the tank 1 from the feed pipe 2. To prevent the medium from accumulating in the feed pipe 2, the annular airbag 10 is connected to the mounting groove 3 through the vent pipe 9. When the gas in the mounting groove 3 is squeezed by the annular piston 11 of the drive unit, the gas enters the annular airbag 10 through the vent pipe 9, causing the annular airbag 10 to inflate and expand, and then tightly fit with the sealing groove 16 of the convex rod 15 of the fixing component, blocking the leakage of the medium from the gap between the feed pipe 2 and the convex rod 15. When the seal is released, the gas in the annular airbag 10 flows back to the mounting groove 3 through the vent pipe 9, and the annular airbag 10 contracts, without affecting the opening of the sealing cover 5.

[0023] Specifically, the drive unit includes an annular piston 11, which is movably installed inside the mounting groove 3. Several push rods 12 are fixedly installed on the side of the annular piston 11 near the annular cover 4. The other end of the push rod 12 passes through the annular cover 4 and is movably sleeved inside the positioning hole 14. The drive unit also includes several springs 13, which are fixedly installed at equal intervals along the circumference on one side of the annular piston 11 near the push rod 12. The other end of the spring 13 is fixedly installed on one side of the annular cover 4, and the spring 13 is movably sleeved on the outside of the push rod 12.

[0024] In this embodiment, the annular piston 11 is movably installed inside the mounting groove 3. When the sealing cover 5 presses the push rod 12 through the positioning hole 14, the push rod 12 pushes the annular piston 11 towards the vent pipe 9, stretching the spring 13 and thus compressing the gas in the mounting groove 3. This allows the gas to enter the annular airbag 10 through the vent pipe 9, providing power for the inflation and expansion of the annular airbag 10. When the sealing cover 5 is opened and the push rod 12 is no longer compressed, the annular piston 11 moves away from the vent pipe 9 under the contraction force of the spring 13, releasing the gas from the annular airbag 10. The body is withdrawn from the mounting groove 3, allowing the annular airbag 10 to deflate. One end of the push rod 12 is fixedly installed on the side of the annular piston 11 near the annular cover 4, and the other end passes through the annular cover 4 and is movably fitted in the positioning hole 14, playing a dual role of force transmission and positioning. On the one hand, the annular cover 4 provides a through channel for the push rod 12, ensuring that the push rod 12 can pass smoothly through and connect to the positioning hole 14. On the other hand, it provides a fixed support point for the spring 13, so that the spring 13 can stably connect the annular piston 11 and the annular cover 4, ensuring that the spring 13 is stable in position during the stretching or contraction process and does not shift.

[0025] Specifically, the fixing component includes a convex rod 15, which is fixedly installed on the side of the sealing cover 5 near the feed pipe 2. A sealing groove 16 is provided on the outer side of the end of the convex rod 15 away from the sealing cover 5. The sealing groove 16 is used in conjunction with the annular airbag 10. The fixing assembly also includes a movable groove 18, which is opened at one end of the convex rod 15 near the sealing cover 5. The movable groove 18 is connected to the threaded hole 17. The threaded hole 17 is threadedly connected to a pressing rod 20. One end of the pressing rod 20 is movably sleeved inside the movable groove 18, wherein the end of the pressing rod 20 movably sleeved inside the movable groove 18 is tapered. The fixing component also includes several sliding holes 19, which are equidistantly opened on the outside of the convex rod 15 along the circumference. The position of the sliding holes 19 corresponds to the position of the rectangular groove 6. The sliding holes 19 are connected to the movable groove 18. A fixing rod 21 is movably installed inside the sliding hole 19, and the other end of the fixing rod 21 is movably sleeved inside the rectangular groove 6.

[0026] In this embodiment, the fixing rod 21 is movably installed inside the sliding hole 19, with one end near the extrusion rod 20 being inclined and the other end movably fitted inside the rectangular groove 6 being trapezoidal. When the extrusion rod 20 is screwed into the movable groove 18 along the threaded hole 17, its tapered end applies an axial thrust to the inclined surface of the fixing rod 21. Because the inclined surface structure can efficiently convert the axial thrust into a radial force that pushes the fixing rod 21 to move outward from the sliding hole 19, the fixing rod 21 can quickly extend out of the sliding hole 19 and embed into the rectangular groove 6, thus fixing the convex rod 15 to the feed pipe 2. When the extrusion rod 20 rotates in the opposite direction to release the extrusion on the fixing rod 21, and the sealing cover 5 and the convex rod 15 need to be pulled out, the fixing rod... The inclined side of the trapezoidal end 21 will contact the edge of the rectangular groove 6. Under the action of the pull-out force, the rectangular groove 6 will squeeze the trapezoidal end, forcing the fixing rod 21 to retract into the sliding hole 19. This prevents the fixing rod 21 from getting stuck in the rectangular groove 6, which would make it difficult to remove the sealing cover 5 and the convex rod 15. The extrusion rod 20 is threaded in the threaded hole 17. One end is tapered and is movably sleeved in the movable groove 18. By rotating the extrusion rod 20, it can be moved axially along the threaded hole 17. The tapered end can accurately act on the inclined surface of the fixing rod 21. By utilizing the structural cooperation between the tapered and the inclined surface, the fixing rod 21 is efficiently pushed out of the sliding hole 19. The other end of the extrusion rod 20 is fixedly installed with a knob for easy operation by the staff.

[0027] In summary: When using this utility model, first manually pick up the sealing cover 5, align the positioning hole 14 at the bottom of the sealing cover 5 with the end of the drive unit push rod 12, and simultaneously allow the convex rod 15 of the fixing component to slowly extend into the feed pipe 2 until the sealing cover 5 is tightly against the annular cover 4. Then, manually rotate the extrusion rod 20 in the threaded hole 17 on one side of the sealing cover 5, so that the extrusion rod 20 moves along the threaded hole 17 into the movable groove 18 of the convex rod 15. Its conical end will apply an axial thrust to the inclined surface of the fixing rod 21, and this thrust is converted into a radial force to push. The fixing rod 21 extends along the sliding hole 19 until its trapezoidal end is embedded in the rectangular groove 6 of the feed pipe 2, thus fixing the sealing cover 5 to the feed pipe 2. During the process of fitting the positioning hole 14 and pressing the sealing cover 5, the positioning hole 14 applies pressure to the top rod 12, pushing the annular piston 11 to move closer to the vent pipe 9 in the mounting groove 3. At this time, the spring 13 is stretched, and the gas in the mounting groove 3 is squeezed and enters the annular air bladder 10 of the sealing assembly through the vent pipe 9. The annular air bladder 10 is inflated inside the U-shaped mounting ring 7. The feed pipe 2 and the convex rod 15 are then tightly fitted together to achieve a seal between the feed pipe 2 and the convex rod 15, preventing leakage of the medium inside the tank 1. When it is necessary to open the sealing cover 5 to add medium or for maintenance, first manually rotate the knob of the extrusion rod 20 in the opposite direction to allow the conical end of the extrusion rod 20 to exit the movable groove 18, releasing the pressure on the fixed rod 21. Then manually pull the sealing cover 5 outward, and the convex rod 15 moves together with the sealing cover 5. The trapezoidal end of the fixed rod 21 contacts the edge of the rectangular groove 6. Under the action of the pulling force, the rectangular groove 6 aligns with the trapezoidal end of the convex rod 15. The end is squeezed, forcing the fixed rod 21 to retract into the sliding hole 19. At the same time, the sealing cover 5 drives the positioning hole 14 to disengage from the top rod 12. The top rod 12 is no longer under force, and the stretched spring 13 contracts, pulling the annular piston 11 to move away from the vent pipe 9, drawing the gas in the annular airbag 10 back into the mounting groove 3. After the annular airbag 10 contracts, it no longer fits the sealing groove 16. The sealing cover 5 can be fully opened by manually pulling it. After that, the medium can be added into the tank 1 through the feed pipe 2. After use, the above sealing steps can be repeated.

[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. An environmentally friendly plastic-lined corrosion-resistant tank, comprising a tank body (1), characterized in that, It also includes a feed pipe (2), an annular cover (4), a sealing cover (5), a sealing assembly, a driving part, and a fixing assembly. The feed pipe (2) is fixedly installed at one end of the tank body (1). An installation groove (3) is provided at one end of the feed pipe (2). The annular cover (4) is fixedly installed at the end of the feed pipe (2) away from the tank body (1). A number of rectangular grooves (6) are provided at equal intervals along the circumference on the inner wall of the feed pipe (2) near the pipe opening. The sealing cover (5) is located on one side of the annular cover (4). A number of positioning holes (14) are provided at equal intervals along the circumference at the bottom of the sealing cover (5). A threaded hole (17) is provided on one side of the sealing cover (5). The sealing assembly is located inside the feed pipe (2). The driving part is located inside the installation groove (3). The fixing assembly is located on the side of the sealing cover (5) near the feed pipe (2). The sealing assembly and the fixing assembly are used together.

2. The environmentally friendly plastic-lined corrosion-resistant tank according to claim 1, characterized in that, The sealing assembly includes a U-shaped mounting ring (7), which is fixedly installed on the inner wall of the feed pipe (2) near the tank (1). The inner wall of the U-shaped mounting ring (7) is provided with a plurality of mounting holes (8) at equal intervals along the circumference, and the top of the U-shaped mounting ring (7) is set with an inclined surface.

3. The environmentally friendly plastic-lined corrosion-resistant tank according to claim 2, characterized in that, The sealing assembly also includes an annular airbag (10), which is fixedly installed inside the U-shaped mounting ring (7). A vent pipe (9) is fixedly installed on the side of the annular airbag (10) near the mounting hole (8). The other end of the vent pipe (9) passes through the mounting hole (8) and the feed pipe (2) and is connected to the mounting groove (3).

4. The environmentally friendly plastic-lined corrosion-resistant tank according to claim 3, characterized in that, The drive unit includes an annular piston (11), which is movably installed inside the mounting groove (3). Several push rods (12) are fixedly installed on the side of the annular piston (11) near the annular cover (4). The other end of the push rod (12) passes through the annular cover (4) and is movably sleeved inside the positioning hole (14).

5. The environmentally friendly plastic-lined corrosion-resistant tank according to claim 4, characterized in that, The drive unit also includes several springs (13), which are fixedly installed at equal intervals along the circumference on one side of the annular piston (11) near the push rod (12). The other end of the spring (13) is fixedly installed on one side of the annular cover (4), and the spring (13) is movably sleeved on the outside of the push rod (12).

6. The environmentally friendly plastic-lined corrosion-resistant tank according to claim 1, characterized in that, The fixing component includes a convex rod (15), which is fixedly installed on the side of the sealing cover (5) near the feed pipe (2). A sealing groove (16) is provided on the outer side of the end of the convex rod (15) away from the sealing cover (5). The sealing groove (16) is used in conjunction with the annular airbag (10).

7. The environmentally friendly plastic-lined corrosion-resistant tank according to claim 6, characterized in that, The fixing component also includes a movable groove (18), which is opened at one end of the convex rod (15) near the sealing cover (5). The movable groove (18) is connected to a threaded hole (17), and a pressing rod (20) is threaded inside the threaded hole (17). One end of the pressing rod (20) is movably sleeved inside the movable groove (18), wherein the end of the pressing rod (20) movably sleeved inside the movable groove (18) is tapered.

8. An environmentally friendly plastic-lined corrosion-resistant tank according to claim 7, characterized in that, The fixing component also includes a plurality of sliding holes (19), which are equidistantly opened on the outside of the convex rod (15) along the circumference. The position of the sliding holes (19) corresponds to the position of the rectangular groove (6). The sliding holes (19) are connected to the movable groove (18). A fixing rod (21) is movably installed inside the sliding hole (19), and the other end of the fixing rod (21) is movably sleeved inside the rectangular groove (6).

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