Granular activated carbon recycling device

Abstract

The utility model belongs to the technical field of granular activated carbon recycling, and particularly relates to a granular activated carbon recycling device which comprises a reaction kettle and a kettle cover, the kettle cover is fixedly connected to the upper end of the reaction kettle, and a feeding pipe is fixedly connected to the middle position in the kettle cover. According to the granular activated carbon recycling device, when the granular activated carbon is activated and recycled, firstly, the granular activated carbon is poured into the reaction kettle from the feeding pipe, then the reaction kettle and the ultrasonic vibrator are started, and the granular activated carbon in the reaction kettle and the ultrasonic vibrator is heated, so that impurities at the outer end of the granular activated carbon fall off; meanwhile, an output shaft of a first motor is started to rotate to drive an elliptical plate to rotate, a first screen is pushed to slide up and down along the outer side of a limiting rod, and granular activated carbon at the upper end of the first screen is driven to shake; meanwhile, impurities falling from the outer end of the granular activated carbon continuously fall onto the first screen from gaps of the granular activated carbon and then are screened to the bottom end in the reaction kettle.

Description

Technical Field

[0001] The utility model relates to the technical field of granular activated carbon recovery, and specifically relates to a device for recycling and utilization of granular activated carbon. Background Technique

[0002] During the adsorption process of activated carbon, when its adsorption capacity is saturated, it will be replaced with new activated carbon. The replaced activated carbon is generally processed and recycled, and some activated carbon can be reactivated by high temperature during processing.

[0003] The internal structure of the existing activated carbon activation and recovery device is extremely complex and troublesome to manufacture.

[0004] For example, a device for recycling and utilization of granular activated carbon disclosed in Chinese Patent CN216172383U has a heating function compared with the existing recycling device. When the device is started, the granular activated carbon is put into the heating chamber and heated at a high temperature through the heating wire inside the heating chamber to make the impurities attached to the granular activated carbon fall off by high-temperature deoxidation; compared with the existing recycling device, this recycling device has an ultrasonic vibration function. When the granular activated carbon enters the reaction kettle, the impurities on the granular activated carbon are shaken off through ultrasonic vibration, and then the impurities are filtered through a filter screen to achieve an efficient cleaning effect; compared with the existing recycling device, this recycling device has a drying function. When the granular activated carbon undergoes a series of heating, ultrasonic vibration and cleaning, finally, it is dried by a fan and a heating plate, and the structure is simple and easy to operate.

[0005] However, the granular activated carbon accumulated in the reaction kettle cannot move, so when external impurities fall, they will fall on the outer surface of the granular activated carbon and cannot fall through the filter screen into the impurity placement cavity at the lower end.

[0006] Therefore, we urgently need to provide a device for recycling and utilization of granular activated carbon that can shake the granular activated carbon. Content of the Utility Model

[0007] The purpose of the utility model is to provide a device for recycling and utilization of granular activated carbon to solve the problem that the granular activated carbon accumulated in the reaction kettle cannot move, so when external impurities fall, they will fall on the outer surface of the granular activated carbon and cannot fall through the filter screen into the impurity placement cavity at the lower end as mentioned in the above background technique.

[0008] To achieve the above object, the utility model provides the following technical solution: A device for recycling granular activated carbon, comprising a reaction kettle and a kettle cover. The kettle cover is fixedly connected to the upper end of the reaction kettle. In the middle position inside the kettle cover, a feed pipe is fixedly connected. On the outer side of the lower end of the reaction kettle, a support rod is fixedly connected. In the middle position of the lower end of the reaction kettle, a discharge pipe is fixedly connected. A recycling mechanism is connected between the inner and outer ends of the reaction kettle. The recycling mechanism includes a recycling unit and a material receiving unit. The recycling unit is arranged at the inner and outer ends of the reaction kettle, and the material receiving unit is arranged at the right end of the reaction kettle.

[0009] The recycling unit includes a water tank, a water pump, a water inlet pipe, a limiting rod, a first screen, an ultrasonic vibrator, a first motor, an elliptical plate, a connecting pipe, a cleaning cylinder, a liquid outlet pipe, a filter screen, a blanking pipe, a cleaning box, a second screen, a connecting frame, a second motor, a fan blade, a heating wire and a sealing plate. The water tank is arranged on the left side of the reaction kettle. The water pump is fixedly connected to the right end of the water tank. The water inlet pipe is fixedly connected to the right end of the water pump. The limiting rod is vertically fixedly connected to the inner left and right ends of the reaction kettle. The first screen is connected to the outer ends of the limiting rod. The ultrasonic vibrator is fixedly connected to the inside of the reaction kettle. The first motor is fixedly connected to the middle positions of the outer left and right ends of the reaction kettle. The elliptical plate is fixedly connected to the output shaft end of the first motor. The connecting pipe is fixedly connected to the middle position of the inner right end of the reaction kettle. The cleaning cylinder is fixedly connected to the end of the connecting pipe away from the reaction kettle. The liquid outlet pipe is fixedly connected to the right end of the cleaning cylinder. The filter screen is fixedly connected to the inner right end of the cleaning cylinder. The blanking pipe is fixedly connected to the middle position of the lower end inside the cleaning cylinder. The cleaning box is fixedly connected to the lower end of the blanking pipe. The second screen is fixedly connected to the inner left and right ends of the cleaning box. The connecting frame is fixedly connected to the middle position on the right side of the cleaning box. The second motors are fixedly connected to the right side of the connecting frame at equal intervals. The fan blade is fixedly connected to the left end of the output shaft of the second motor. The heating wire is connected to the right end of the cleaning box. The sealing plate is connected to the front end of the cleaning box. Valves are arranged inside the discharge pipe, the connecting pipe and the blanking pipe.

[0010] Further improvement lies in that the right end of the water inlet pipe is fixedly connected to the middle position of the inner left end of the reaction kettle. Limiting holes are provided at the left and right ends inside the first screen. The outer side of the limiting rod is slidably connected to the inner side of the limiting hole. The outer edge of the first screen is slidably connected to the inner side of the reaction kettle. Thus, when the first screen moves, it can only slide along the outer side of the limiting rod, thereby playing a role in limiting the movement of the first screen.

[0011] Further improvement lies in that the outer side of the elliptical plate abuts against the left and right ends of the lower side of the first sieve mesh. Thus, when starting the first motor and its output shaft rotates to drive the elliptical plate to rotate, it will push the first sieve mesh to slide up and down along the outer side of the limiting rod, so that the granular activated carbon at the upper end of the first sieve mesh vibrates, and the impurities falling off from the outer end of the granular activated carbon will continuously fall through the gaps of the granular activated carbon onto the first sieve mesh and then be sifted down to the inner bottom end of the reaction kettle, so that the impurities can be smoothly sifted down.

[0012] Further improvement lies in that the material receiving unit includes a lower connecting plate, a connecting block, a threaded rod and a rotating handle. The lower connecting plate is fixedly connected to the middle position on the right side of the sealing plate. The connecting block is fixedly connected to the middle position at the front end on the right side of the cleaning box. The threaded rod is connected to the middle position inside the connecting block. The rotating handle is fixedly connected to the upper end of the threaded rod.

[0013] Further improvement lies in that a first threaded hole is opened at the middle position inside the connecting block, a second threaded hole is opened at the middle position at the rear end inside the lower connecting plate, the outer side of the threaded rod is threadedly connected to the inner sides of the first threaded hole and the second threaded hole, and the front end on the left side of the cleaning box is hinged to the left side of the sealing plate. Thus, after rotating the sealing plate to the front side of the cleaning box and moving the rear part of the lower connecting plate to the lower side of the connecting block, and then threadedly connecting the threaded rod to the first threaded hole and the second threaded hole, the lower connecting plate can be fixed to the lower side of the connecting block, so that the sealing plate is fixed to the front side of the cleaning box.

[0014] Further improvement lies in that through grooves are opened at the middle positions at the left and right ends inside the cleaning box, and the heating wire is fixed to the inner side of the through groove at the right end inside the cleaning box. Thus, when starting the second motor and the heating wire, the output shaft of the second motor rotates to drive the fan blade to rotate and blow air to the left, and the air flow forms hot air after passing through the heating wire and enters the cleaning box. After passing through the granular activated carbon between the second sieve meshes and then blowing out from the through groove at the left end of the cleaning box, the granular activated carbon between the second sieve meshes can be dried.

[0015] Further improvement lies in that a rubber pad is fixedly connected to the rear side of the sealing plate. Thus, after fixing the sealing plate to the front side of the cleaning box, by contacting the front side of the second sieve mesh through the rubber pad on the rear side of the sealing plate, it can prevent the granular activated carbon in the second sieve mesh from leaking out from the contact position between the second sieve mesh and the sealing plate.

[0016] In summary, the present application discloses a device for recycling granular activated carbon.

[0017] In this technical solution, when impurities fall off the outer surface of the granular activated carbon in the reaction kettle, the first motor is started, and the rotation of its output shaft drives the elliptical plate to rotate, which will push the first screen to slide up and down along the outside of the limiting rod. As a result, the granular activated carbon at the upper end of the first screen shakes, so that the impurities falling off from the outer end of the granular activated carbon will continuously fall through the gaps of the granular activated carbon onto the first screen and then be sifted down to the inner bottom of the reaction kettle, thus enabling the impurities to be smoothly sifted down.

[0018] Furthermore, when the second motor and the heating wire are started, the rotation of the output shaft of the second motor drives the fan blade to rotate and blow air to the left. The air flow passes through the heating wire to form hot air into the cleaning box. After passing through the granular activated carbon between the second screens, it is blown out from the through groove at the left end of the cleaning box, so as to dry the granular activated carbon between the second screens. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the main structure of the present utility model;

[0020] Figure 2 is a schematic diagram of the internal structure of the reaction kettle of the present utility model;

[0021] Figure 3 is a schematic diagram of the internal structure of the cleaning cylinder of the present utility model;

[0022] Figure 4 is a schematic diagram of the structure at the right end of the cleaning box of the present utility model;

[0023] Figure 5 is a schematic diagram of the structure at the left end of the cleaning box of the present utility model;

[0024] Figure 6 is Figure 1 the enlarged view of part A of

[0025] In the figure: 1, reaction kettle; 2, kettle cover; 3, feed pipe; 4, support rod; 5, discharge pipe; 601, water tank; 602, water pump; 603, water inlet pipe; 604, limiting rod; 605, first screen; 606, ultrasonic vibrator; 607, first motor; 608, elliptical plate; 609, connecting pipe; 610, cleaning cylinder; 611, liquid outlet pipe; 612, filter screen; 613, blanking pipe; 614, cleaning box; 615, second screen; 616, connecting frame; 617, second motor; 618, fan blade; 619, heating wire; 620, sealing plate; 701, lower connecting plate; 702, connecting block; 703, threaded rod; 704, rotating handle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figures 1-6 , the present invention provides a technical solution:

[0028] Embodiment 1:

[0029] A device for recycling granular activated carbon includes a reaction kettle 1 and a kettle cover 2. The kettle cover 2 is fixedly connected to the upper end of the reaction kettle 1. A feed pipe 3 is fixedly connected to the middle position inside the kettle cover 2. A support rod 4 is fixedly connected to the outer side of the lower end of the reaction kettle 1. A discharge pipe 5 is fixedly connected to the middle position of the lower end of the reaction kettle 1. A recycling mechanism is connected to both the inner and outer ends of the reaction kettle 1. The recycling mechanism includes a recycling unit and a material collecting unit. The recycling unit is arranged at both the inner and outer ends of the reaction kettle 1, and the material collecting unit is arranged at the right end of the reaction kettle 1.

[0030] The recycling unit includes a water tank 601, a water pump 602, a water inlet pipe 603, a limiting rod 604, a first screen 605, an ultrasonic vibrator 606, a first motor 607, an elliptical plate 608, a connecting pipe 609, a cleaning cylinder 610, a liquid outlet pipe 611, a filter screen 612, a blanking pipe 613, a cleaning box 614, a second screen 615, a connecting frame 616, a second motor 617, a fan blade 618, a heating wire 619, and a sealing plate 620. The water tank 601 is arranged on the left side of the reaction kettle 1. The water pump 602 is fixedly connected to the right end of the water tank 601. The water inlet pipe 603 is fixedly connected to the right end of the water pump 602. The limiting rod 604 is vertically fixedly connected to both the left and right ends inside the reaction kettle 1. The first screen 605 is connected to the outer ends of the limiting rod 604. The ultrasonic vibrator 606 is fixedly connected to the inside of the reaction kettle 1. The right end of the water inlet pipe 603 is fixedly connected to the middle position of the left end inside the reaction kettle 1. Limiting holes are provided at both the left and right ends inside the first screen 605. The outer side of the limiting rod 604 is slidably connected to the inner side of the limiting holes. The outer edge of the first screen 605 is slidably connected to the inside of the reaction kettle 1. Thus, when the first screen 605 moves, it can only slide along the outer side of the limiting rod 604, thereby playing a role in limiting the movement of the first screen 605.

[0031] The first motor 607 is fixedly connected to the middle positions of the left and right ends on the outside of the reaction kettle 1. The elliptical plate 608 is fixedly connected to the output shaft end of the first motor 607. The outside of the elliptical plate 608 abuts against the left and right ends of the lower side of the first screen 605. Thus, when the first motor 607 is started and its output shaft rotates to drive the elliptical plate 608 to rotate, it will push the first screen 605 to slide up and down along the outside of the limiting rod 604, so that the granular activated carbon at the upper end of the first screen 605 shakes. As a result, the impurities falling off from the outer end of the granular activated carbon will continuously fall through the gaps of the granular activated carbon onto the first screen 605 and then be sifted down to the inner bottom end of the reaction kettle 1, so that the impurities can be smoothly sifted down.

[0032] The connecting pipe 609 is fixedly connected to the middle position of the right end inside the reaction kettle 1. The cleaning cylinder 610 is fixedly connected to the end of the connecting pipe 609 away from the reaction kettle 1. The liquid outlet pipe 611 is fixedly connected to the right end of the cleaning cylinder 610. The filter screen 612 is fixedly connected to the right end inside the cleaning cylinder 610. The feeding pipe 613 is fixedly connected to the middle position of the lower end inside the cleaning cylinder 610. The cleaning box 614 is fixedly connected to the lower end of the feeding pipe 613. The second screen 615 is fixedly connected to the left and right ends inside the cleaning box 614. The connecting frame 616 is fixedly connected to the middle position on the right side of the cleaning box 614. The second motors 617 are fixedly connected to the right side of the connecting frame 616 at equal distances. The fan blades 618 are fixedly connected to the left end of the output shaft of the second motors 617. The heating wire 619 is connected to the right end of the cleaning box 614. The sealing plate 620 is connected to the front end of the cleaning box 614. Valves are provided inside the discharge pipe 5, the connecting pipe 609, and the feeding pipe 613.

[0033] Through grooves are provided at the middle positions of the left and right ends inside the cleaning box 614, and the heating wire 619 is fixed to the inside of the through groove at the right end inside the cleaning box 614. Thus, when the second motor 617 and the heating wire 619 are started, the output shaft of the second motor 617 rotates to drive the fan blades 618 to rotate and blow air to the left. The air flow passes through the heating wire 619 to form hot air into the cleaning box 614, passes between the granular activated carbon between the second screens 615, and then blows out from the through groove at the left end of the cleaning box 614, so as to dry the granular activated carbon between the second screens 615.

[0034] Example two:

[0035] On the basis of Embodiment 1: The material receiving unit includes a lower connecting plate 701, a connecting block 702, a threaded rod 703, and a rotating handle 704. The lower connecting plate 701 is fixedly connected to the middle position on the right side of the sealing plate 620. The connecting block 702 is fixedly connected to the middle position at the front end on the right side of the cleaning tank 614. The threaded rod 703 is connected to the middle position inside the connecting block 702, and the rotating handle 704 is fixedly connected to the upper end of the threaded rod 703. A first threaded hole is provided at the middle position inside the connecting block 702, and a second threaded hole is provided at the middle position at the rear end inside the lower connecting plate 701. The outer side of the threaded rod 703 is threadedly connected to the inner sides of the first threaded hole and the second threaded hole. The front end on the left side of the cleaning tank 614 is hinged to the left side of the sealing plate 620. Thus, after rotating the sealing plate 620 to the front side of the cleaning tank 614 and moving the rear part of the lower connecting plate 701 to the lower side of the connecting block 702, and then threadedly connecting the threaded rod 703 to the first threaded hole and the second threaded hole, the lower connecting plate 701 can be fixed to the lower side of the connecting block 702, so that the sealing plate 620 is fixed to the front side of the cleaning tank 614.

[0036] Embodiment 3:

[0037] On the basis of Embodiment 1: A rubber pad is fixedly connected to the rear side of the sealing plate 620. Thus, after fixing the sealing plate 620 to the front side of the cleaning tank 614, by contacting the front side of the second screen 615 with the rubber pad on the rear side of the sealing plate 620, it can prevent the granular activated carbon in the second screen 615 from leaking out from the contact position between the second screen 615 and the sealing plate 620.

[0038] Working principle: When activating and recycling granular activated carbon, first pour the granular activated carbon into the reaction kettle 1 from the feed pipe 3, then start the reaction kettle 1 and the ultrasonic vibrator 606 to heat the granular activated carbon therein, so that the impurities at its outer end fall off. At the same time, start the first motor 607, the rotation of its output shaft drives the elliptical plate 608 to rotate, pushing the first screen 605 to slide up and down along the outside of the limit rod 604, driving the granular activated carbon at the upper end of the first screen 605 to shake. At the same time, the impurities falling off from the outer end of the granular activated carbon continuously fall through the gaps of the granular activated carbon onto the first screen 605 and are then screened down to the inner bottom end of the reaction kettle 1. After the filtration is completed, first open the valve in the discharge pipe 5, and the impurities at the inner bottom end of the reaction kettle 1 are discharged from the discharge pipe 5. After the discharge is completed, close the valve inside the discharge pipe 5. Then open the valve in the connecting pipe 609 and start the water pump 602 to pump the cleaning water in the water tank 601 into the water inlet pipe 603 and then into the interior of the reaction kettle 1. The granular activated carbon above the first screen 605 is flushed into the connecting pipe 609 and then into the cleaning cylinder 610, and then is continuously washed by the cleaning water entering the cleaning cylinder 610. At the same time, the sewage flows out from the liquid outlet pipe 611 at the right end after passing through the filter screen 612. After the granular activated carbon is cleaned, open the valve in the blanking pipe 613, and the granular activated carbon in the cleaning cylinder 610 falls into the interior of the cleaning box 614. Then start the second motor 617 and the heating wire 619. The rotation of the output shaft of the second motor 617 drives the fan blade 618 to rotate and blow air to the left. The air flow passes through the heating wire 619 to form hot air into the cleaning box 614, passes between the granular activated carbon between the second screens 615 and then blows out from the through groove at the left end of the cleaning box 614 to dry the granular activated carbon between the second screens 615. After the granular activated carbon between the second screens 615 is dried, rotate the rotary handle 704 to drive the threaded rod 703 to rotate and move upward at the same time until the threaded rod 703 moves out of the second threaded hole, then rotate the sealing plate 620 away from the cleaning box 614, and then recycle the granular activated carbon that has been activated in the second screen 615.

[0039] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

Claims

1. A granular activated carbon recycling device, comprising a reactor (1) and a reactor cover (2), wherein the reactor cover (2) is fixedly connected to the upper end of the reactor (1), characterized in that: A feed pipe (3) is fixedly connected to the middle position of the inner part of the kettle cover (2); a support rod (4) is fixedly connected to the outer side of the lower end of the reactor (1); a discharge pipe (5) is fixedly connected to the middle position of the lower end of the reactor (1); and a recovery mechanism is connected to the inner and outer ends of the reactor (1), the recovery mechanism comprising a recovery unit and a material receiving unit, the recovery unit is arranged at the inner and outer ends of the reactor (1), and the material receiving unit is arranged at the right end of the reactor (1); The recovery unit comprises a water tank (601), a water pump (602), a water inlet pipe (603), a stop rod (604), a first screen (605), an ultrasonic vibrator (606), a first motor (607), an elliptical plate (608), a connecting pipe (609), a cleaning cylinder (610), a liquid outlet pipe (611), a filter (612), a feed pipe (613), a cleaning tank (614), a second screen (615), a connecting frame (616), a second motor (617), a fan blade (618), a heating wire (619) and a sealing plate (620). The water tank (601) is provided with On the left side of the reactor (1), the water pump (602) is fixedly connected to the right end of the water tank (601), the water inlet pipe (603) is fixedly connected to the right end of the water pump (602), the limit rod (604) is vertically fixedly connected to the left and right ends of the inner side of the reactor (1), the first screen (605) is connected to the outer end of the limit rod (604), the ultrasonic vibrator (606) is fixedly connected to the inside of the reactor (1), the first motor (607) is fixedly connected to the middle position of the left and right ends of the outer side of the reactor (1), and the elliptical plate (608) is fixedly connected to the first motor. The output shaft end of the machine (607) is fixedly connected to the middle position of the right end inside the reaction kettle (1), the cleaning cylinder (610) is fixedly connected to the end of the connecting pipe (609) away from the reaction kettle (1), the liquid outlet pipe (611) is fixedly connected to the right end of the cleaning cylinder (610), the filter screen (612) is fixedly connected to the inner right end of the cleaning cylinder (610), the feed pipe (613) is fixedly connected to the middle position of the lower end inside the cleaning cylinder (610), the cleaning box (614) is fixedly connected to the lower end of the feed pipe (613), and the second screen screen (611) is fixedly connected to the right end of the cleaning cylinder (610). 15) is fixedly connected to the left and right ends of the inner side of the cleaning box (614), the connecting frame (616) is fixedly connected to the middle position of the right side of the cleaning box (614), the second motor (617) is fixedly connected to the right side of the connecting frame (616) at an equal distance, the fan blade (618) is fixedly connected to the left end of the output shaft of the second motor (617), the heating wire (619) is connected to the right end of the cleaning box (614), the sealing plate (620) is connected to the front end of the cleaning box (614), and valves are arranged inside the discharge pipe (5), the connecting pipe (609) and the discharge pipe (613).

2. The granular activated carbon recycling device according to claim 1, characterized in that: The right end of the water inlet pipe (603) is fixedly connected to the middle position of the left end inside the reactor (1), and limiting holes are provided at the left and right ends inside the first screen (605). The outer side of the limiting rod (604) is slidably connected to the inner side of the limiting hole, and the outer edge of the first screen (605) is slidably connected to the inner side of the reactor (1).

3. The granular activated carbon recycling device according to claim 1, characterized in that: The outer side of the elliptical plate (608) abuts against the left and right ends of the lower side of the first screen (605).

4. The granular activated carbon recycling device according to claim 1, characterized in that: The material receiving unit comprises a lower connecting plate (701), a connecting block (702), a threaded rod (703) and a rotating handle (704); the lower connecting plate (701) is fixedly connected to the middle position of the right side of the sealing plate (620); the connecting block (702) is fixedly connected to the middle position of the right front end of the cleaning box (614); the threaded rod (703) is connected to the inner middle position of the connecting block (702); and the rotating handle (704) is fixedly connected to the upper end of the threaded rod (703).

5. The granular activated carbon recycling device according to claim 4, characterized in that: A first threaded hole is provided in the middle of the connecting block (702), a second threaded hole is provided in the middle of the rear end of the lower connecting plate (701), the outer side of the threaded rod (703) is threadedly connected to the first threaded hole and the inner side of the second threaded hole, and the left front end of the cleaning box (614) is hinged to the left side of the sealing plate (620).

6. The granular activated carbon recycling device according to claim 1, characterized in that: A through slot is provided in the middle of the left and right ends of the cleaning box (614), and the heating wire (619) is fixed to the inner side of the through slot at the right end of the cleaning box (614).

7. The granular activated carbon recycling device according to claim 1, characterized in that: A rubber pad is fixedly connected to the rear side of the sealing plate (620).

Images