A high-efficiency filtration device for PVC resin production

Abstract

This utility model relates to the field of PVC resin filtration technology, and discloses a high-efficiency filtration device for PVC resin production. It includes a base plate, a vibration mechanism on the top of the base plate, a support leg fixedly connected to the top of the base plate, a tank slidably connected to the inner wall of the support leg, a quick-release mechanism on the top of the tank, and a filtration mechanism inside the tank. A support platform is fixedly connected to the top center of the base plate, and a motor is fixedly connected to the left side of the support platform. The output end of the motor passes through the left end of the support platform and is fixedly connected to a housing. In this utility model, the swing arm connecting the slider and the top connecting plate reciprocates through the circular motion of the slider and the limiting motion of the connecting plate, causing the tank to vibrate up and down. This effectively prevents filter pore clogging, improves the filtration effect of the filtration components, and reduces vibration loss by adjusting the amplitude to suit resins of different viscosities.

Description

Technical Field

[0001] This utility model relates to the field of PVC resin filtration technology, and in particular to a high-efficiency filtration device for PVC resin production. Background Technology

[0002] PVC resin is short for polyvinyl chloride resin. It is a thermoplastic synthetic resin with excellent comprehensive performance and wide application. By adjusting the formula and process, it can be adapted to the needs of different fields. It has a high cost performance. With the advancement of technology, environmentally friendly PVC materials are gradually replacing traditional products.

[0003] With the expansion of PVC applications in medical, food packaging, high-end building materials, and other fields, there are strict requirements for the content of resin impurities. Traditional filtration methods suffer from low filtration accuracy, easy clogging, and frequent replacement, which cannot meet the production needs of high-purity resin. Therefore, a high-efficiency filtration device for PVC resin production is needed to improve product quality.

[0004] Early PVC resin filtration devices mainly consisted of a filter tank and a fixed filter screen. The fixed filter screen, as the core filtration component, relied on static interception to achieve solid-liquid separation. However, the filter screen was easily clogged by high-viscosity resin, resulting in a sharp drop in filtration efficiency and poor production continuity. To solve these problems, existing filtration devices introduced vibrating filter screens and multi-layer filter cartridge structures. Vibration prevents filter screen clogging, and layered filtration improves accuracy, filtration efficiency, and stability. However, in actual use, the vibrating structure suffers from severe component wear due to high-frequency vibration, resulting in high maintenance costs and failing to meet user needs. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a high-efficiency filtration device for PVC resin production, which aims to improve the problem of severe component wear and high maintenance costs caused by high-frequency vibration in existing vibrating structures.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-efficiency filtration device for PVC resin production, comprising a base plate, a vibration mechanism provided on the top of the base plate, a support leg fixedly connected to the top of the base plate, a tank body slidably connected to the inner wall of the support leg, a quick-release mechanism provided on the top of the tank body, and a filtration mechanism provided inside the tank body.

[0007] A support platform is fixedly connected to the top center of the base plate. A motor is fixedly connected to the left side of the support platform. The output end of the motor passes through the left end of the support platform and is fixedly connected to a housing. A slider is slidably connected to the front end of the inner side of the housing. A swing arm is rotatably connected to the right side of the slider. A connecting plate is fixedly connected to the bottom of the tank. The top end of the swing arm is rotatably connected to the bottom of the connecting plate. An adjustment component is provided inside the housing. A buffer component is provided on the top of the support platform.

[0008] As a further description of the above technical solution:

[0009] The quick-release mechanism includes a fixed plate, the bottom of which is fixedly connected to the top of the tank. Multiple connecting posts are fixedly connected to the top of the fixed plate. Each of the connecting posts has a locking block rotatably connected to its outer wall. Each locking block has a guide groove on one side of its top. A rotating ring is rotatably connected to the inner side of the fixed plate. Multiple sliding posts are fixedly connected to the top of the rotating ring. The outer walls of the sliding posts are slidably connected to the inner sides of their respective guide grooves. A groove is provided on the front side of the outer wall of the fixed plate. A control component is provided inside the groove.

[0010] As a further description of the above technical solution:

[0011] The adjustment assembly includes a knob, the rear end of which is rotatably connected to the front side of the housing. The rear end of the knob passes through the front side of the housing and is fixedly connected to a lead screw. The rear end of the lead screw passes through the front side of the slider and is rotatably connected to the rear end of the inner side of the housing. The upper and lower sides of the inner wall of the housing are provided with sliding grooves, and the upper and lower sides of the slider are slidably connected to the inner walls of the corresponding sliding grooves.

[0012] As a further description of the above technical solution:

[0013] The buffer assembly includes multiple springs, the bottoms of which are fixedly connected to the top left and right sides of the support platform, respectively. Buffer plates are provided on the top left and right sides of the control platform, and the bottom front and rear sides of the two buffer plates are fixedly connected to the top of the corresponding springs.

[0014] As a further description of the above technical solution:

[0015] The control assembly includes a control rod, the rear end of which is fixedly connected to the front side of the outer wall of the rotating ring, the outer wall of the control rod is slidably connected to the inner wall of the groove, and a spring is fixedly connected to the right side of the outer wall of the control rod, the right end of which is fixedly connected to the right side of the inner wall of the groove.

[0016] As a further description of the above technical solution:

[0017] A heat insulation layer is fixedly connected to the bottom of the inner wall of the tank, and a heating wire is provided between the inner wall of the tank and the outer wall of the heat insulation layer.

[0018] As a further description of the above technical solution:

[0019] The filtration mechanism includes a housing, the outer wall of which is slidably connected to the inner wall of the insulation layer, a protective layer fixedly connected to the upper middle part of the inner side of the housing, a filter layer fixedly connected to the middle part of the inner side of the housing, a separation layer provided in the lower middle part of the inner side of the housing, a discharge pipe connected to the bottom right side of the inner wall of the housing, the bottom end of the discharge pipe penetrating the bottom of the inner wall of the tank, and a control valve provided in the middle of the outer wall of the discharge pipe.

[0020] As a further description of the above technical solution:

[0021] The top of the fixed plate is provided with a protective cover, and the top of the protective cover is connected to an injection pipe. Limiting grooves are opened around the inner wall of the support leg, and the outer wall of the tank is slidably connected to the inner wall of the corresponding limiting groove.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the output end of the motor drives the housing to rotate, and the housing acts as a crank. The swing arm connected between the slider and the top connecting plate will form a reciprocating motion through the circular motion of the slider and the limiting of the connecting plate, so that the tank will vibrate up and down. This can effectively prevent the filter holes from clogging and improve the filtration effect of the filter components. By adjusting the amplitude to match the resin with different viscosities, vibration loss can be reduced.

[0024] 2. In this utility model, pulling the control lever causes the rotating ring to rotate inside the fixed plate. As the rotating ring rotates, the sliding pins at the top of the rotating ring slide inside the corresponding guide grooves. The sliding pins, through the action of the guide grooves, cause the locking block to rotate circumferentially around the axis of the connecting pin. This allows the locking block to release the fixing of the outer shell from above by rotating, so that the outer shell can be removed from the inside of the tank, facilitating the cleaning and replacement of the internal filter components. Attached Figure Description

[0025] Figure 1 This is a perspective view of a high-efficiency filtration device for PVC resin production according to the present invention.

[0026] Figure 2 This is a front view of a high-efficiency filtration device for PVC resin production proposed in this utility model;

[0027] Figure 3 This is a cross-sectional view of the protective cover of a high-efficiency filtration device for PVC resin production proposed in this utility model.

[0028] Figure 4 This is an exploded view of the tank body of a high-efficiency filtration device for PVC resin production proposed in this utility model;

[0029] Figure 5 This is a schematic diagram of the support platform for a high-efficiency filtration device for PVC resin production proposed in this utility model.

[0030] Figure 6 This is a cross-sectional view of the outer casing of a high-efficiency filtration device for PVC resin production proposed in this utility model.

[0031] Legend:

[0032] 1. Base plate; 2. Support leg; 3. Tank body; 4. Vibration mechanism; 401. Support platform; 402. Motor; 403. Shell; 404. Slider; 405. Swing arm; 406. Connecting plate; 407. Adjustment component; 4071. Knob; 4072. Lead screw; 4073. Slide groove; 408. Buffer component; 4081. Spring 2; 4082. Buffer plate; 5. Quick release mechanism; 501. Fixed plate; 502. Connecting column; 503, locking block; 504, guide groove; 505, rotating ring; 506, sliding column; 507, groove; 508, control component; 5081, control rod; 5082, spring one; 6, insulation layer; 7, heating wire; 8, filtration mechanism; 801, outer shell; 802, protective layer; 803, filter layer; 804, separation layer; 805, discharge pipe; 806, control valve; 9, protective cover; 10, injection pipe; 11, limiting groove. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figure 1 , Figure 2 and Figure 5 An embodiment of this utility model is provided: a high-efficiency filtration device for PVC resin production, including a base plate 1, which serves as a load-bearing device. A vibration mechanism 4 is provided on the top of the base plate 1. A support leg 2 is fixedly connected to the top of the base plate 1. A tank 3 is slidably connected to the inner wall of the support leg 2. A quick-release mechanism 5 is provided on the top of the tank 3. A filtration mechanism 8 is provided inside the tank 3.

[0035] A support platform 401 is fixedly connected to the top center of the base plate 1. When the tank 3 does not need to be driven by the swing arm 405 to vibrate, the support platform 401 can support the tank 3. A motor 402 is fixedly connected to the left side of the support platform 401. The output end of the motor 402 passes through the left end of the support platform 401 and is fixedly connected to the housing 403. The motor 402 can drive the housing 403 to rotate. A slider 404 is slidably connected to the front end of the inner side of the housing 403. A swing arm 405 is rotatably connected to the right side of the slider 404. The housing 403 and the slider 404 act as a crank, and the circular motion is transformed into the reciprocating motion of the swing arm 405. A connecting plate 406 is fixedly connected to the bottom of the tank 3. The connecting plate 406 connects the swing arm 405 to the tank 3. The top end of the swing arm 405 is rotatably connected to the bottom of the connecting plate 406. An adjustment component 407 is provided inside the housing 403. A buffer component 408 is provided on the top of the support platform 401.

[0036] The adjustment assembly 407 includes a knob 4071. The rear end of the knob 4071 is rotatably connected to the front side of the housing 403. The rear end of the knob 4071 passes through the front side of the housing 403 and is fixedly connected to a lead screw 4072. The knob 4071 can drive the lead screw 4072 to rotate. The rear end of the lead screw 4072 passes through the front side of the slider 404 and is rotatably connected to the rear end of the inner side of the housing 403. The rotation of the lead screw 4072 causes the slider 404 to move linearly along the lead screw 4072. The upper and lower sides of the inner wall of the housing 403 are provided with sliding grooves 4073. The upper and lower sides of the slider 404 are slidably connected to the inner walls of the corresponding sliding grooves 4073. The sliding grooves 4073 can limit the slider 404.

[0037] The buffer assembly 408 includes multiple springs 4081. The bottom of the multiple springs 4081 is fixedly connected to the top left and right sides of the support platform 401. Buffer plates 4082 are provided on the top left and right sides of the control platform. The springs 4081 and buffer plates 4082 play a buffering role in the fall of the tank 3 and play a supporting role when the tank 3 does not need to vibrate. The bottom front and rear sides of the two buffer plates 4082 are fixedly connected to the top of the corresponding springs 4081.

[0038] Specifically, during the filtration process of PVC resin through the filter assembly, after starting the motor 402, the output end of the motor 402 drives the housing 403 to rotate. The slider 404 inside the housing 403 rotates accordingly. The housing 403 acts as a crank. The slider 404 is connected to the swing arm 405 of the top connecting plate 406. The swing arm 405 uses the circumferential motion of the slider 404 and the limiting motion of the connecting plate 406 to generate reciprocating motion, thereby pushing the tank 3 upward and pulling the tank 3 downward. This continuous reciprocating motion causes the tank 3 to vibrate up and down, effectively preventing the filter holes from clogging and improving the efficiency of the filtration process. For high-viscosity PVC resin, vibration helps the resin pass through the filter screen more smoothly, reducing the residue of impurities and thus improving the filtration efficiency and quality. At the same time, the buffer pad and spring 4081 play a buffering role when the tank 3 descends. By rotating the knob 4071, the lead screw 4072 is driven to rotate, causing the slider 404 to move in the limited position of the slide groove 4073 inside the housing 403, changing the distance between the slider 404 and the output end of the motor 402, thereby adjusting the reciprocating stroke of the swing arm 405 and the amplitude of the tank 3 to meet the needs of resins with different viscosities.

[0039] Reference Figure 1 , Figure 3 and Figure 4 The quick-release mechanism 5 includes a fixed plate 501, the bottom of which is fixedly connected to the top of the tank body 3. Multiple connecting posts 502 are fixedly connected to the top of the fixed plate 501, and these connecting posts 502 limit the movement of the locking blocks 503. Locking blocks 503 are rotatably connected to the top of the outer walls of each of the multiple connecting posts 502. The locking blocks 503, by rotating, can limit and fix the outer shell 801. Guide grooves 504 are provided on one side of the top of each of the multiple locking blocks 503. A rotating ring is rotatably connected to the inner side of the fixed plate 501. 505, the top of the rotating ring 505 is fixedly connected with multiple sliding columns 506. The rotation of the rotating ring 505 drives the sliding columns 506 to rotate together. The outer walls of the multiple sliding columns 506 are slidably connected to the inner side of the corresponding guide groove 504. The sliding columns 506 slide in the inner side of the guide groove 504 through the rotation of the rotating ring 505, so that the locking block 503 is pulled and rotates around the connecting column 502 as the axis. The front side of the outer wall of the fixed plate 501 is provided with a groove 507, and the inner side of the groove 507 is provided with a control component 508.

[0040] The control assembly 508 includes a control rod 5081. The rear end of the control rod 5081 is fixedly connected to the front side of the outer wall of the rotating ring 505. Pulling the control rod 5081 can cause the rotating ring 505 to rotate a certain distance inside the fixed plate 501. The outer wall of the control rod 5081 is slidably connected to the inner wall of the groove 507. A spring 5082 is fixedly connected to the right side of the outer wall of the control rod 5081. The spring 5082 can reset the control rod 5081. The right end of the spring 5082 is fixedly connected to the right side of the inner wall of the groove 507.

[0041] Specifically, PVC resin is injected into the inner side of the outer shell 801 through the injection pipe 10. It undergoes layer-by-layer filtration through the protective layer 802, filter layer 803, and separation layer 804 to ensure the purity of the PVC resin. When the filter element becomes clogged and needs replacement or cleaning, the control lever 5081 is pulled. The control lever 5081 drives the rotating ring 505 to rotate inside the fixed plate 501. As the rotating ring 505 rotates, the sliding pins 506 at the top of the rotating ring 505 slide within their respective guide grooves 504. The sliding pins 506, through the action of the guide grooves 504, allow the... The locking block 503 rotates circumferentially around the axis of the connecting column 502, thereby releasing the locking block 503 from the top by rotating it. This allows the outer shell 801 to be removed from the inside of the tank 3, facilitating the cleaning and replacement of the internal filter components. After replacement, the outer shell 801 is slid back into the tank 3, with its bottom in contact with the tank 3. The control rod 5081 is then released from above, and the spring resets the control rod 5081, causing the rotating ring 505 to rotate in the opposite direction. This allows the locking block 503 to apply a limit to the outer shell 801 from above, quickly completing the fixation.

[0042] Reference Figure 3 , Figure 4 and Figure 6 A heat insulation layer 6 is fixedly connected to the bottom of the inner wall of the tank 3. The heat insulation layer 6 can maintain the temperature. A heating wire 7 is provided between the inner wall of the tank 3 and the outer wall of the heat insulation layer 6. The heating wire 7 heats the resin and prevents it from solidifying due to cooling. The filtration mechanism 8 includes a shell 801. The outer wall of the shell 801 is slidably connected to the inner wall of the heat insulation layer 6. A protective layer 802 is fixedly connected to the upper middle part of the inner side of the shell 801. The protective layer 802 is used to withstand stress and perform coarse filtration. A filter layer 803 is fixedly connected to the outer shell 801. The filter layer 803 is used to intercept gel particles in the resin. A separation layer 804 is provided in the lower middle part of the inner side of the outer shell 801. The separation layer 804 is used for deep filtration. A discharge pipe 805 is connected to the bottom right side of the inner wall of the outer shell 801. The filtered resin is discharged through the discharge pipe 805. The bottom end of the discharge pipe 805 penetrates the bottom of the inner wall of the tank 3. A control valve 806 is provided in the middle of the outer wall of the discharge pipe 805. The control valve 806 can control the opening and closing of the discharge pipe 805.

[0043] The top of the fixed plate 501 is provided with a protective cover 9, which can prevent other impurities from falling into the filter component. The top of the protective cover 9 is connected to the injection pipe 10, through which the material is injected into the filter component. The inner wall of the support leg 2 is provided with limit grooves 11. The outer wall of the tank 3 is slidably connected to the inner wall of the corresponding limit groove 11. The limit groove 11 guides the up and down movement of the tank 3.

[0044] Specifically, the resin falls into the protective layer 802 through the injection pipe 10. The protective layer 802 withstands the impact of the falling resin and performs coarse filtration. The resin then falls and passes through the filter layer 803 and the separation layer 804 in sequence to ensure purity through layer-by-layer filtration. Finally, the filtered resin is discharged by controlling the opening and closing of the valve 806.

[0045] Working Principle: When PVC resin is filtered through the filter element, starting the motor 402 causes the output of the motor 402 to rotate the housing 403. The slider 404 inside the housing 403 rotates accordingly. The housing 403 acts as a crank. The swing arm 405 connected between the slider 404 and the top connecting plate 406 will reciprocate through the circular motion of the slider 404 and the limiting motion of the connecting plate 406, pushing the tank 3 upward and pulling the tank 3 downward. Through continuous reciprocating motion, the tank 3 forms an up-and-down vibration effect, which can effectively prevent the filter holes from clogging and improve the filtration efficiency. For PVC resin with high viscosity, vibration can help the resin pass through the filter screen better, reduce impurity residue, and improve filtration efficiency and quality. At the same time, the buffer pad and spring 4081 play a buffering role when the tank 3 falls. By rotating the knob 4071, the lead screw 4072 is rotated, so that the slider 404 moves inside the housing 403 through the limit of the slide groove 4073. The distance between the slider 404 and the output end of the motor 402 changes, which can change the reciprocating stroke of the swing arm 405 and the amplitude of the tank 3. By changing the amplitude, it can be adapted to resins with different viscosities.

[0046] PVC resin is injected into the inner side of the outer casing 801 through the injection pipe 10. It undergoes layer-by-layer filtration through the protective layer 802, filter layer 803, and separation layer 804 to ensure the purity of the PVC resin. When the filter element becomes clogged and needs replacement and cleaning, the control rod 5081 is pulled. The control rod 5081 drives the rotating ring 505 to rotate inside the fixed plate 501. As the rotating ring 505 rotates, the sliding pins 506 at the top of the rotating ring 505 slide within their respective guide grooves 504. The sliding pins 506 are secured by the guide grooves 504. Block 503 rotates circumferentially around the axis of connecting column 502, thereby releasing the fixing of the outer shell 801 from above by rotating the block 503. This allows the outer shell 801 to be removed from the inside of the tank 3, facilitating the cleaning and replacement of the internal filter components. After replacement, the outer shell 801 is slid back into the tank 3, with its bottom in contact with the tank 3. The control rod 5081 is released from above, and the spring resets the control rod 5081, causing the rotating ring 505 to rotate in the opposite direction. This allows the block 503 to apply a limiting position to the outer shell 801 from above, quickly completing the fixing.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency filtration device for PVC resin production, comprising a base plate (1), characterized in that: The bottom plate (1) is provided with a vibration mechanism (4) at the top, and a support leg (2) is fixedly connected to the top of the bottom plate (1). The inner wall of the support leg (2) is slidably connected to a tank (3). The top of the tank (3) is provided with a quick-release mechanism (5), and the inside of the tank (3) is provided with a filter mechanism (8). A support platform (401) is fixedly connected to the top center of the base plate (1). A motor (402) is fixedly connected to the left side of the support platform (401). The output end of the motor (402) passes through the left end of the support platform (401) and is fixedly connected to a housing (403). A slider (404) is slidably connected to the front end of the inner side of the housing (403). A swing arm (405) is rotatably connected to the right side of the slider (404). A connecting plate (406) is fixedly connected to the bottom of the tank (3). The top end of the swing arm (405) is rotatably connected to the bottom of the connecting plate (406). An adjustment component (407) is provided inside the housing (403). A buffer component (408) is provided on the top of the support platform (401).

2. The high-efficiency filtration device for PVC resin production according to claim 1, characterized in that: The quick-release mechanism (5) includes a fixed plate (501), the bottom of which is fixedly connected to the top of the tank (3), and a plurality of connecting columns (502) are fixedly connected to the top of the fixed plate (501). Each of the outer walls of the plurality of connecting columns (502) is rotatably connected to a locking block (503). Each of the locking blocks (503) has a guide groove (504) on one side of its top. A rotating ring (505) is rotatably connected to the inner side of the fixed plate (501). A plurality of sliding columns (506) are fixedly connected to the top of the rotating ring (505). The outer walls of the plurality of sliding columns (506) are slidably connected to the inner side of the corresponding guide groove (504). A groove (507) is provided on the front side of the outer wall of the fixed plate (501). A control component (508) is provided on the inner side of the groove (507).

3. The high-efficiency filtration device for PVC resin production according to claim 1, characterized in that: The adjustment assembly (407) includes a knob (4071), the rear end of which is rotatably connected to the front side of the housing (403). The rear end of the knob (4071) passes through the front side of the housing (403) and is fixedly connected to a lead screw (4072). The rear end of the lead screw (4072) passes through the front side of the slider (404) and is rotatably connected to the rear end of the inner side of the housing (403). The upper and lower sides of the inner wall of the housing (403) are provided with sliding grooves (4073). The upper and lower sides of the slider (404) are slidably connected to the inner walls of the corresponding sliding grooves (4073).

4. The high-efficiency filtration device for PVC resin production according to claim 1, characterized in that: The buffer assembly (408) includes multiple springs (4081), the bottoms of which are fixedly connected to the top left and right sides of the support platform (401). The top left and right sides of the support platform (401) are provided with buffer plates (4082), and the bottom front and rear sides of the two buffer plates (4082) are fixedly connected to the top of the corresponding springs (4081).

5. The high-efficiency filtration device for PVC resin production according to claim 2, characterized in that: The control assembly (508) includes a control rod (5081), the rear end of which is fixedly connected to the front side of the outer wall of the rotating ring (505), the outer wall of which is slidably connected to the inner wall of the groove (507), and a spring (5082) is fixedly connected to the right side of the outer wall of the control rod (5081), the right end of which is fixedly connected to the right side of the inner wall of the groove (507).

6. The high-efficiency filtration device for PVC resin production according to claim 1, characterized in that: The bottom of the inner wall of the tank (3) is fixedly connected to a heat insulation layer (6), and a heating wire (7) is provided between the inner wall of the tank (3) and the outer wall of the heat insulation layer (6).

7. The high-efficiency filtration device for PVC resin production according to claim 6, characterized in that: The filtration mechanism (8) includes a shell (801), the outer wall of the shell (801) is slidably connected to the inner wall of the insulation layer (6), a protective layer (802) is fixedly connected to the upper inner side of the shell (801), a filter layer (803) is fixedly connected to the middle inner side of the shell (801), a separation layer (804) is provided on the lower inner side of the shell (801), a discharge pipe (805) is connected to the bottom right side of the inner wall of the shell (801), the bottom end of the discharge pipe (805) penetrates the bottom of the inner wall of the tank (3), and a control valve (806) is provided on the middle outer wall of the discharge pipe (805).

8. A high-efficiency filtration device for PVC resin production according to claim 2, characterized in that: The top of the fixed plate (501) is provided with a protective cover (9), and the top of the protective cover (9) is connected to the injection pipe (10). The inner walls of the support leg (2) are provided with limit grooves (11) around the perimeter. The outer walls of the tank (3) are slidably connected to the inner walls of the corresponding limit grooves (11) around the perimeter.

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