Nylon split type EPS conveying roller

Abstract

The invention relates to the technical field of conveying rollers, in particular to a nylon split type EPS conveying roller which comprises a square shaft roller core, a nylon roller assembly is installed on the square shaft roller core, the nylon roller assembly comprises nylon roller faces, a plurality of nylon roller faces are fixedly installed on the nylon roller faces through bolts, a protection assembly is installed on the square shaft roller core, and the protection assembly is fixedly installed on the square shaft roller core. The protection assembly comprises movable frames movably installed at the two ends of the square shaft roller core, and one side of each movable frame is rotationally connected with a connecting frame. The plasma liquid absorbs heat of the bolt, reduces the temperature and reduces the risks of oxidation and thermal expansion, so that thread seizure of the bolt is prevented, the service life of the bolt is prolonged, and thread seizure caused by thread surface oxidation or thermal expansion possibly due to the fact that the bolt is in a high-temperature environment for a long time in a plate processing production line running at a high speed is prevented.

Description

Technical Field

[0001] This invention relates to the field of conveyor roller technology, specifically a nylon split EPS conveyor roller. Background Technology

[0002] The nylon split EPS conveyor roller is particularly suitable for improving conveyor roller systems in high temperature, high humidity, and highly corrosive working environments. It can be widely used in sheet metal processing production lines in industries such as steel and non-ferrous metals.

[0003] Currently, during the process of conveying materials through nylon split EPS conveyor rollers in the sheet processing production line, the bolts connecting the nylon roller surface and the square shaft roller core are in a high-temperature environment for a long time. The bolts are easily affected by high temperatures, which can lead to oxidation of the thread surface or thermal expansion, and thus easily cause the threads to seize up, seriously affecting the normal operation of the production line. Summary of the Invention

[0004] The purpose of this invention is to provide a nylon split EPS conveying roller. The movable frame transmits the plasma to the inside of the connecting frame through the convex ring. When the plasma is conveyed to each set of rubber pipes through the connecting frame, the plasma absorbs the heat of the bolts and reduces the temperature, thereby reducing the risk of oxidation and thermal expansion. This prevents the bolt threads from seizing, extends the service life of the bolts, and prevents the bolts from being in a high-temperature environment for a long time in a high-speed sheet metal processing production line, which may lead to oxidation or thermal expansion of the thread surface and cause the threads to seize.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a nylon split-type EPS conveying roller, comprising a square shaft roller core, on which a nylon roller assembly is mounted, the nylon roller assembly comprising a nylon roller surface, and multiple sets of nylon roller surfaces are fixedly mounted on the nylon roller surface by bolts; a protective assembly is mounted on the square shaft roller core, the protective assembly comprising movable frames movably mounted at both ends of the square shaft roller core, each of the two sets of movable frames being rotatably connected to a connecting frame on one side, and multiple sets of rubber pipes connecting the two sets of connecting frames; the multiple sets of rubber pipes are installed between each set of nylon roller surfaces and the square shaft roller core, wherein four sets of rubber pipes are connected to multiple sets of inflatable sealing rings on one side, and one set of movable frames is connected to a nozzle on one side.

[0006] Preferably, the square shaft roller core is provided with multiple sets of screw holes, and each set of nylon roller surfaces is fixedly connected to the square shaft roller core by bolts and screw holes. The square shaft roller core is made of alloy steel.

[0007] Preferably, both sets of movable frames are provided with a first groove inside, and both sets of connecting frames are provided with a convex ring on one side that slides inside the first groove, and the convex ring communicates with the inside of the movable frame.

[0008] Preferably, one side of another set of movable frames is connected to a liquid inlet pipe, and one end of the liquid inlet pipe is connected to a plasma liquid sprayer. Each set of movable frames is made of modified MC nylon material.

[0009] Preferably, one side of one of the movable frames is connected to a first pipe, the first pipe is equipped with a pressure valve, and one end of the first pipe is fixedly connected to one side of the nozzle.

[0010] Preferably, each group of rubber pipes is disposed on one side of the bolt, each group of rubber pipes is made of elastic material, and each group of rubber pipes is elastic.

[0011] Preferably, one side of each of the four sets of rubber pipes is connected to a second pipe, and one end of the second pipe is connected to an inflatable sealing ring.

[0012] Preferably, a second groove is provided at the connection between every two sets of nylon roller surfaces, and the inflatable sealing ring of each set is disposed inside the second groove of each set.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. In this invention, when the operator starts the plasma sprayer at one end of the inlet pipe, the plasma sprayer transmits the plasma into the movable frame through the inlet pipe. The movable frame transmits the plasma to the connecting frame through the convex ring. When the plasma is delivered to each set of rubber pipes through the connecting frame, the plasma absorbs the heat of the bolt and reduces the temperature, thereby reducing the risk of oxidation and thermal expansion. This prevents the bolt threads from seizing, extends the bolt service life, and prevents the bolt from being in a high-temperature environment for a long time in a high-speed sheet metal processing production line, which may lead to oxidation or thermal expansion of the thread surface and cause the threads to seize.

[0015] 2. In this invention, plasma liquid is continuously transported into the rubber pipe by another set of movable frames. The pressure inside the rubber pipe and one of the movable frames gradually increases. When the pressure valve detects that the pressure inside the rubber pipe and the first pipe is too high, the pressure valve automatically opens, allowing the plasma liquid inside the pressure valve and the movable frame to be transported to the nozzle through the first pipe. The nozzle sprays the plasma liquid onto the surface of multiple sets of nylon rollers. The plasma forms an alumina ceramic layer on the nylon roller surface, improving the performance of the nylon roller surface and extending its lifespan.

[0016] 3. In this invention, when the internal pressure of the rubber pipe and one of the movable frames decreases, the pressure valve detects the decrease in internal pressure and closes. The movable frame stops transmitting plasma liquid to the nozzle through the first pipe, and the nozzle stops spraying onto the nylon roller surface. Due to the closure of the pressure valve and the continuous transmission of plasma liquid into the rubber pipe by the other movable frame, plasma liquid continuously accumulates inside the section of the rubber pipe with increased elasticity. The plasma liquid causes this section of the rubber pipe to expand and adhere to the aging nylon roller surface, providing temporary emergency support for the aging nylon roller surface. This prevents the nylon roller surface from aging due to prolonged use, which could lead to loosening of the connection with the square shaft roller core, increased radial runout between the nylon roller surface and the square shaft roller core, and easy deviation or slippage during sheet conveying. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0019] Figure 3 This is one of the cross-sectional views of the protective component structure of the present invention;

[0020] Figure 4 This is a second cross-sectional view of the protective component structure of the present invention;

[0021] Figure 5 This is a third cross-sectional view of the protective component structure of the present invention;

[0022] Figure 6 This is a schematic diagram showing the connection between the nylon roller surface and the inflatable sealing ring structure of the present invention;

[0023] Figure 7 This is a schematic diagram of the connection between the rubber pipe and the inflatable sealing ring structure of the present invention;

[0024] Figure 8 For the present invention Figure 7 Enlarged view of the structure at point A in the image.

[0025] In the diagram: 1. Square shaft roller core; 2. Nylon roller assembly; 201. Nylon roller surface; 202. Screw hole; 203. Bolt; 3. Protective assembly; 301. Movable frame; 302. Connecting frame; 303. Raised ring; 304. Rubber pipe; 305. First pipe; 306. Pressure valve; 307. Nozzle; 308. Liquid inlet pipe; 309. Second pipe; 310. Inflatable sealing ring. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] See Figures 1 to 2 As shown, the present invention provides a nylon split EPS conveyor roller, including a square shaft roller core 1, a nylon roller assembly 2 mounted on the square shaft roller core 1, the nylon roller assembly 2 including a nylon roller surface 201, and multiple sets of nylon roller surfaces 201 fixedly mounted on the nylon roller surface 201 by bolts 203;

[0028] Each set of nylon roller surfaces 201 is connected to the screw holes 202 by bolts 203, and each set of nylon roller surfaces 201 is fixedly installed on the square shaft roller core 1. When one set of nylon roller surfaces 201 has a problem, the staff can quickly replace the problematic nylon roller surface 201 by tightening the bolts 203 with a wrench that is compatible with the bolts 203. The modular and decomposable structure design of the nylon roller surfaces 201 enables quick replacement, reduces maintenance costs and improves production efficiency.

[0029] See Figures 3 to 7 As shown, a protective component 3 is installed on the square shaft roller core 1. The protective component 3 includes movable frames 301 that are movably installed at both ends of the square shaft roller core 1. Each of the two movable frames 301 is rotatably connected to a connecting frame 302 on one side. Multiple sets of rubber pipes 304 are connected between the two sets of connecting frames 302. The multiple sets of rubber pipes 304 are installed between each nylon roller surface 201 and the square shaft roller core 1. Each of the four sets of rubber pipes 304 is connected to multiple sets of inflatable sealing rings 310 on one side. One set of movable frames 301 is connected to a nozzle 307 on one side.

[0030] Since the convex rings 303 on one side of both sets of connecting frames 302 slide on the first groove inside the two sets of movable frames 301, and the convex rings 303 are connected to the inside of the movable frames 301, the movable frames 301 do not affect the rotation of the square shaft roller core 1 when it rotates. In the sheet metal processing production line of the steel, non-ferrous metals and other industries, when the square shaft roller core 1 is started to transfer the sheet metal, the operator starts the plasma sprayer at one end of the liquid inlet pipe 308. The plasma sprayer transfers the plasma into the movable frame 301 through the liquid inlet pipe 308. The plasma is transferred to the inside of the connecting frame 302 through the convex ring 303. When the plasma is delivered to each set of rubber pipes 304 through the connecting frame 302, since each set of rubber pipes 304 is located on one side of the bolt 203, the plasma absorbs the heat of the bolt 203 and reduces the temperature, thereby reducing the risk of oxidation and thermal expansion. This prevents the threads of the bolt 203 from seizing, extends the service life of the bolt 203, and prevents the bolt 203 from being in a high-temperature environment for a long time in the high-speed plate processing production line, which may cause oxidation or thermal expansion of the thread surface and cause the threads to seize.

[0031] Initially, when the internal pressure of the rubber pipe 304 and one set of movable frames 301 is normal, the pressure valve 306 is initially closed. When the other set of movable frames 301 continuously transmits plasma liquid into the rubber pipe 304, the internal pressure of the rubber pipe 304 and one set of movable frames 301 gradually increases. Due to the restriction of the nylon roller surface 201 and the square shaft roller core 1, the elastic coefficient of the pressure valve 306 itself will decrease. Therefore, when the pressure valve 306 detects that the internal pressure of the rubber pipe 304 and the first pipe 305 is too high, the pressure valve 306 automatically opens, allowing the plasma liquid inside the pressure valve 306 and the movable frame 301 to be transmitted to the nozzle 307 through the first pipe 305. The nozzle 307 sprays the plasma liquid onto the surface of multiple sets of nylon roller surfaces 201. The plasma forms an alumina ceramic layer on the nylon roller surface 201, improving the performance of the nylon roller surface 201 and extending its lifespan.

[0032] When one set of nylon roller surfaces 201 undergoes prolonged use, aging occurs. The connection between the aged set of nylon roller surfaces 201 and the square shaft roller core 1 becomes loose, and the connection distance increases. This reduces the restraining force between the aged set of nylon roller surfaces 201 and the square shaft roller core 1 on this section of the rubber pipe 304, increasing the elastic coefficient of the rubber pipe 304. Consequently, the internal pressure between the rubber pipe 304 and one set of movable frames 301 decreases. Upon detecting this decrease in internal pressure, the pressure valve 306 closes, preventing the movable frame 301 from transmitting power to the nozzle 307 via the first pipe 305. When the plasma spray nozzle 307 stops spraying onto the nylon roller surface 201, the pressure valve 306 closes and another set of movable frames 301 continuously transmits plasma into the rubber pipe 304. As a result, plasma continuously accumulates inside the section of the rubber pipe 304 with increased elasticity. The plasma causes this section of the rubber pipe 304 to expand and adhere to the aging nylon roller surface 201. This provides temporary emergency support for the aging nylon roller surface 201 to prevent it from aging due to prolonged use, which could lead to loosening of the connection with the square shaft roller core 1, increased radial runout between the nylon roller surface 201 and the square shaft roller core 1, and easy deviation or slippage during sheet conveying.

[0033] When no aging occurs, each pair of nylon roller surfaces 201 are tightly fitted together. Each pair of nylon roller surfaces 201 will compress the inflatable sealing ring 310 between the second grooves. The rubber pipe 304 will not transmit plasma liquid to the inflatable sealing ring 310 through the second pipe 309, causing the inflatable sealing ring 310 to expand. When the aging pair of nylon roller surfaces 201 loosens its connection to the square shaft roller core 1, it will also loosen its connection to one of its adjacent pairs of nylon roller surfaces 201. When the pressure on the inflatable sealing ring 310 between the second grooves decreases or disappears, the rubber pipe 304 will transmit plasma liquid to the movable frame 301 through the second pipe 309, causing the movable frame 301 to expand and fill the connection between the aging set of nylon roller surfaces 201 and one of the adjacent sets of nylon roller surfaces 201. This effectively prevents the sealing failure caused by the aging and loosening of the nylon roller surfaces 201, and prevents impurities from the transmitted sheet material from falling to the connection between the nylon roller surfaces 201 and the square shaft roller core 1, which would cause increased vibration of the nylon roller surfaces 201 and the square shaft roller core 1 and safety hazards.

[0034] In an optional embodiment, the square shaft roller core 1 is provided with multiple sets of screw holes 202, and each set of nylon roller surface 201 is fixedly connected to the square shaft roller core 1 by bolts 203 and screw holes 202. The square shaft roller core 1 is made of alloy steel.

[0035] It should be noted that each set of nylon roller surfaces 201 is fixed to the square shaft roller core 1 by bolts 203 and screw holes 202. If a certain set malfunctions, the staff can use an adapter wrench to quickly loosen the bolts 203 and remove the faulty nylon roller surface 201, so as to quickly replace the roller surface and reduce maintenance costs.

[0036] In an optional embodiment, each of the two sets of movable frames 301 has a first groove inside, and each of the two sets of connecting frames 302 has a convex ring 303 on one side that slides inside the first groove, and the convex ring 303 communicates with the inside of the movable frame 301.

[0037] It should be noted that, since the convex rings 303 on one side of the two sets of connecting frames 302 slide on the first groove inside the two sets of movable frames 301, and the convex rings 303 are connected to the inside of the movable frames 301, the movable frames 301 will not affect the rotation of the square shaft roller core 1 when the square shaft roller core 1 rotates.

[0038] In an optional embodiment, another set of movable frames 301 is connected to a liquid inlet pipe 308 on one side, and a plasma sprayer is connected to one end of the liquid inlet pipe 308. Each set of movable frames 301 is made of modified MC nylon material.

[0039] It should be noted that when the staff starts the plasma sprayer at one end of the inlet pipe 308, the plasma sprayer transmits the plasma into the movable frame 301 through the inlet pipe 308.

[0040] In an optional embodiment, one side of a set of movable frames 301 is connected to a first pipe 305, and a pressure valve 306 is provided on the first pipe 305. One end of the first pipe 305 is fixedly connected to one side of the nozzle 307.

[0041] It should be noted that the pressure valve 306 closes when the internal pressure of the rubber pipe 304 and the movable frame 301 is normal, and automatically opens when the pressure is too high, so that the plasma liquid is transmitted to the nozzle 307 through the first pipe 305 for spraying, thereby improving the performance of the nylon roller surface 201. When the nylon roller surface 201 ages and loosens, causing the pressure to decrease, the pressure valve 306 closes to prevent the plasma liquid from being sprayed, and causes the plasma liquid to accumulate and push the rubber pipe 304 to expand and support the aged roller surface, while preventing impurities from falling and causing vibration and safety hazards.

[0042] In an optional embodiment, each set of rubber pipes 304 is disposed on one side of the bolt 203, each set of rubber pipes 304 is made of elastic material, and each set of rubber pipes 304 is elastic.

[0043] It should be noted that since each set of rubber pipes 304 is located on one side of the bolt 203, the plasma absorbs the heat of the bolt 203 and lowers the temperature, reducing the risk of oxidation and thermal expansion.

[0044] In an optional embodiment, one side of the four sets of rubber pipes 304 is connected to a second pipe 309, and one end of the second pipe 309 is connected to an inflatable sealing ring 310.

[0045] It should be noted that the rubber pipe 304 will transmit plasma liquid to the movable frame 301 through the second pipe 309, causing the movable frame 301 to expand and fill the connection between a set of nylon roller surfaces 201 that has aged and one of the adjacent sets of nylon roller surfaces 201.

[0046] In an optional embodiment, a second groove is provided at the connection between every two sets of nylon roller surfaces 201, and an inflatable sealing ring 310 is disposed inside each set of the second groove.

[0047] It should be noted that the second groove is used to install the inflatable sealing ring 310. Under normal circumstances, the nylon roller surface 201 tightly fits and squeezes the sealing ring to achieve a seal. When aging and loosening cause the squeezing force to decrease or disappear, the rubber pipe 304 transmits plasma liquid to the inflatable sealing ring 310 through the second pipe 309 to make it expand and fill the connection between the aged roller surface and the adjacent roller surface, preventing safety hazards such as seal failure, impurities falling and increased vibration.

[0048] Working principle: Each set of nylon roller surfaces 201 is connected to the screw hole 202 by bolts 203, and each set of nylon roller surfaces 201 is fixedly installed on the square shaft roller core 1. When one set of nylon roller surfaces 201 has a problem, the staff can quickly replace the problematic nylon roller surface 201 by tightening the bolt 203 with a wrench that is compatible with the bolt 203.

[0049] When the square shaft roller core 1 rotates, the movable frame 301 will not affect the rotation of the square shaft roller core 1. In the plate processing production line of the steel, non-ferrous metals and other industries, when the square shaft roller core 1 is started to transfer the plate, the operator starts the plasma sprayer at one end of the liquid inlet pipe 308. The plasma sprayer transfers the plasma into the movable frame 301 through the liquid inlet pipe 308. The movable frame 301 transfers the plasma into the connecting frame 302 through the convex ring 303. When the plasma is transported to each set of rubber pipes 304 through the connecting frame 302, the plasma absorbs the heat of the bolt 203 and reduces the temperature, reducing the risk of oxidation and thermal expansion.

[0050] Initially, when the internal pressure of the rubber pipe 304 and one of the movable frames 301 is normal, the pressure valve 306 is initially closed. When the other movable frame 301 continuously transmits plasma liquid into the rubber pipe 304, the internal pressure of the rubber pipe 304 and one of the movable frames 301 gradually increases. Due to the restriction of the nylon roller surface 201 and the square shaft roller core 1, the elastic coefficient of the pressure valve 306 itself will decrease. Therefore, when the pressure valve 306 detects that the internal pressure of the rubber pipe 304 and the first pipe 305 is too high, the pressure valve 306 automatically opens, allowing the plasma liquid inside the pressure valve 306 and the movable frame 301 to be transmitted to the nozzle 307 through the first pipe 305. The nozzle 307 sprays the plasma liquid onto the surface of multiple sets of nylon roller surfaces 201.

[0051] When one set of nylon roller surfaces 201 undergoes prolonged use, aging occurs. The connection between the aged set of nylon roller surfaces 201 and the square shaft roller core 1 becomes loose, and the connection distance increases. This reduces the restraining force between the aged set of nylon roller surfaces 201 and the square shaft roller core 1 on this section of the rubber pipe 304, increasing the elastic coefficient of the rubber pipe 304. Consequently, the internal pressure between the rubber pipe 304 and one set of movable frames 301 decreases. At this point, the pressure valve 306 detects this decrease in internal pressure between the rubber pipe 304 and the movable frame 301. When the pressure valve 306 is closed, the movable frame 301 no longer transmits plasma liquid to the nozzle 307 through the first pipe 305. The nozzle 307 stops spraying onto the nylon roller surface 201. As the pressure valve 306 is closed and another set of movable frames 301 continuously transmits plasma liquid into the rubber pipe 304, plasma liquid continuously accumulates inside the section of the rubber pipe 304 with increased elasticity. The plasma liquid causes this section of the rubber pipe 304 to expand and adhere to a set of nylon roller surfaces 201 that have aged, providing temporary emergency support for the set of nylon roller surfaces 201 that have aged.

[0052] When no aging occurs, each pair of nylon roller surfaces 201 are tightly fitted together. Each pair of nylon roller surfaces 201 will compress the inflatable sealing ring 310 between the second grooves. The rubber pipe 304 will not transmit plasma liquid to the inflatable sealing ring 310 through the second pipe 309 to cause the inflatable sealing ring 310 to expand. When the connection between the aging nylon roller surface 201 and the square shaft roller core 1 becomes loose, the aging nylon roller surface 201 will also become loose with one of the adjacent nylon roller surfaces 201. The pressure of each pair of nylon roller surfaces 201 on the inflatable sealing ring 310 between the second grooves will decrease or disappear. At this time, the rubber pipe 304 will transmit plasma liquid to the movable frame 301 through the second pipe 309 to cause the movable frame 301 to expand and fill the connection between the aging nylon roller surface 201 and one of the adjacent nylon roller surfaces 201.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nylon split-type EPS conveyor roller, comprising a square shaft roller core (1), characterized in that, A nylon roller assembly (2) is installed on the square shaft roller core (1). The nylon roller assembly (2) includes a nylon roller surface (201). Multiple sets of nylon roller surfaces (201) are fixedly installed on the nylon roller surface (201) by bolts (203). A protective assembly (3) is installed on the square shaft roller core (1). The protective assembly (3) includes movable frames (301) that are movably installed at both ends of the square shaft roller core (1). A connecting frame (302) is rotatably connected to one side of each of the two sets of movable frames (301). Multiple sets of rubber pipes (304) are connected between the two sets of connecting frames (302). Multiple sets of rubber pipes (304) are installed between each set of nylon roller surface (201) and the square shaft roller core (1). Multiple sets of air-filled sealing rings (310) are connected to one side of each of the four sets of rubber pipes (304). A nozzle (307) is connected to one side of one set of movable frames (301).

2. The nylon split-type EPS conveyor roller according to claim 1, characterized in that, The square shaft roller core (1) is provided with multiple sets of screw holes (202). Each set of nylon roller surfaces (201) is fixedly connected to the square shaft roller core (1) by bolts (203) and screw holes (202). The square shaft roller core (1) is made of alloy steel.

3. The nylon split-type EPS conveyor roller according to claim 1, characterized in that, Both sets of movable frames (301) are provided with a first groove inside, and both sets of connecting frames (302) are provided with a convex ring (303) on one side that slides inside the first groove. The convex ring (303) is connected to the inside of the movable frame (301).

4. A nylon split-type EPS conveyor roller according to claim 1, characterized in that, Another set of movable frames (301) is connected to a liquid inlet pipe (308) on one side, and a plasma sprayer is connected to one end of the liquid inlet pipe (308). Each set of movable frames (301) is made of modified MC nylon material.

5. A nylon split-type EPS conveyor roller according to claim 1, characterized in that, One side of one of the movable frames (301) is connected to a first pipe (305), and a pressure valve (306) is provided on the first pipe (305). One end of the first pipe (305) is fixedly connected to one side of the nozzle (307).

6. A nylon split-type EPS conveyor roller according to claim 5, characterized in that, Each set of rubber pipes (304) is located on one side of the bolt (203), each set of rubber pipes (304) is made of elastic material, and each set of rubber pipes (304) is elastic.

7. A nylon split-type EPS conveyor roller according to claim 1, characterized in that, One side of the four sets of rubber pipes (304) is connected to a second pipe (309), and one end of the second pipe (309) is connected to an inflatable sealing ring (310).

8. A nylon split-type EPS conveyor roller according to claim 1, characterized in that, A second groove is provided at the connection between every two sets of the nylon roller surfaces (201), and the inflatable sealing ring (310) of each set is provided inside the second groove of each set.

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