Sealing assembly for bridge breaking oil cylinder of garbage incinerator

Abstract

The utility model discloses a sealing assembly for a bridge breaking oil cylinder of a garbage incinerator, and relates to the technical field of garbage incineration. The sealing assembly for the bridge breaking oil cylinder of the garbage incinerator comprises an upper sealing box and a lower sealing box, a hole is formed in the upper sealing box, and a hole is formed in the lower sealing box; the sealing connection assembly is arranged in the upper sealing box and the lower sealing box, the sealing connection assembly comprises an upper sealing plate bottom plate, a first asbestos rubber plate, an upper cover plate, ceramic fiber filler, a lower cover plate, a second asbestos rubber plate and a lower sealing plate bottom plate, and the problem that an existing device cannot well adapt to telescopic movement of an oil cylinder is solved through multiple structural improvement designs; an existing device cannot well adapt to rotation movement of an oil cylinder along a fixed shaft. The problems that an existing device is prone to being damaged, inconvenient to disassemble and replace and prone to being damaged are solved, product operation stability is improved, the service life is prolonged, and using, maintaining and replacing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste incineration, and particularly relates to a sealing assembly for a bridge-breaking oil cylinder of a waste incinerator. Background Art

[0002] In the grate furnace equipment of the waste incineration industry, the grate furnace equipment in the waste incineration industry has the characteristics of large load, complex movement and harsh working environment. When the bridge-breaking device oil cylinder works, there is both telescopic movement and rotational movement along the fixed axis. When the bridge-breaking device oil cylinder works, the position where the oil cylinder is located will be connected to the furnace chamber, and a large amount of high-temperature flue gas in the furnace chamber will leak here, so sealing is required. The use of this bridge-breaking oil cylinder sealing device can enable the oil cylinder sealing device to adapt to the telescopic movement of the oil cylinder, and at the same time can adapt to the rotational movement of the oil cylinder along the fixed axis, which is convenient for disassembly. The existing device has the following deficiencies:

[0003] 1. The existing device cannot well adapt to the telescopic movement of the oil cylinder;

[0004] 2. The existing device cannot well adapt to the rotational movement of the oil cylinder along the fixed axis;

[0005] 3. The existing device is easy to be damaged and is not convenient for disassembly and replacement. Content of the Utility Model

[0006] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and provide a sealing assembly for a bridge-breaking oil cylinder of a waste incinerator, which can solve the problems that the existing device cannot well adapt to the telescopic movement of the oil cylinder, the existing device cannot well adapt to the rotational movement of the oil cylinder along the fixed axis, and the existing device is easy to be damaged and is not convenient for disassembly and replacement.

[0007] To achieve the above purpose, the utility model provides the following technical scheme: A sealing assembly for a bridge-breaking oil cylinder of a waste incinerator, comprising an upper sealing box and a lower sealing box, with holes opened on the upper sealing box and holes opened on the lower sealing box;

[0008] A sealing connection assembly is arranged inside the upper sealing box and the lower sealing box. The sealing connection assembly includes an upper sealing plate bottom plate, an asbestos rubber plate I, an upper cover plate, a ceramic fiber filler, a lower cover plate, an asbestos rubber plate II and a lower sealing plate bottom plate. The surface of the asbestos rubber plate I is closely attached to the hole on the upper sealing box, and the surface of the asbestos rubber plate II is closely attached to the hole on the lower sealing box;

[0009] The surface is threadedly connected with a plurality of bolts I, and the surfaces of the plurality of bolts I are all threadedly connected with the surface of the asbestos rubber plate I, and the surfaces of the plurality of bolts I are all threadedly connected with the surface of the upper cover plate.

[0010] Preferably, flat washers I are sleeved on the surfaces of the plurality of bolts I, the plurality of flat washers I are all in contact with the upper cover plate, nuts I are threadedly connected to the surfaces of the plurality of bolts I, spring washers I are sleeved on the surfaces of the plurality of bolts I, the plurality of spring washers I are respectively in contact with the corresponding nuts I, and the plurality of spring washers I are all in contact with the bottom plate of the upper sealing plate.

[0011] Preferably, the same plurality of bolts I are threadedly connected to the surface of the lower cover plate, the surfaces of the plurality of bolts I are all threadedly connected to the surface of the asbestos rubber sheet II, and the surfaces of the plurality of bolts I are all threadedly connected to the surface of the bottom plate of the lower sealing plate.

[0012] Preferably, flat washers I are sleeved on the surfaces of the plurality of same bolts I, the plurality of flat washers I are all in contact with the lower cover plate, nuts I are threadedly connected to the surfaces of the plurality of same bolts I, spring washers I are sleeved on the surfaces of the plurality of bolts I, the plurality of spring washers I are respectively in contact with the corresponding nuts I, and the plurality of spring washers I are all in contact with the bottom plate of the lower sealing plate.

[0013] Preferably, the ceramic fiber filler is arranged inside the upper sealing box and the lower sealing box, the upper pressing plate is in contact with the surface of the ceramic fiber filler, and the lower pressing plate is in contact with the surface of the ceramic fiber filler.

[0014] Preferably, a plurality of bolts II are threadedly connected to the surface of the upper pressing plate, the surfaces of the plurality of bolts II are all threadedly connected to the inside of the ceramic fiber filler, and the surfaces of the plurality of bolts II are all threadedly connected to the surface of the upper sealing box.

[0015] Preferably, flat washers II are sleeved on the surfaces of the plurality of bolts II, the plurality of flat washers II are all in contact with the upper sealing box, nuts II are threadedly connected to the surfaces of the plurality of bolts II, spring washers II are sleeved on the surfaces of the plurality of bolts II, the plurality of spring washers II are respectively in contact with the corresponding nuts II, and the plurality of spring washers II are all in contact with the upper pressing plate.

[0016] Preferably, the same plurality of bolts II are threadedly connected to the surface of the lower pressing plate, the surfaces of the plurality of bolts II are all threadedly connected to the surface of the ceramic fiber filler, and the surfaces of the plurality of bolts II are all threadedly connected to the surface of the lower sealing box.

[0017] Preferably, flat washers II are sleeved on the surfaces of the plurality of same bolts II, the plurality of flat washers II are all in contact with the lower sealing box, nuts II are threadedly connected to the surfaces of the plurality of same bolts II, spring washers II are sleeved on the surfaces of the plurality of bolts II, the plurality of spring washers II are respectively in contact with the corresponding nuts II, and the plurality of spring washers II are all in contact with the lower pressing plate.

[0018] Preferably, a plurality of bolts three are threadedly connected to the surface of the upper sealing box, the surfaces of the plurality of bolts three are all threadedly connected to the inside of the lower sealing box, flat washers three are sleeved on the surfaces of the plurality of bolts three, the surfaces of the plurality of flat washers three are all in contact with the surface of the lower sealing box, nuts three are threadedly connected to the surfaces of the plurality of bolts three, spring washers three are sleeved on the surfaces of the plurality of bolts three, the surfaces of the plurality of spring washers three are respectively in contact with the surfaces of the corresponding nuts three, and the surfaces of the plurality of spring washers three are all in contact with the surface of the upper sealing box.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] (1) For the sealing assembly of the bridge-breaking oil cylinder of the waste incinerator, through various structural improvement designs, the problems that the current device cannot well adapt to the telescopic movement of the oil cylinder, the current device cannot well adapt to the rotational movement of the oil cylinder along the fixed axis, the current device is prone to damage, inconvenient to disassemble and replace, and easy to be damaged are solved, the operation stability and service life of the product are improved, and the use and maintenance replacement costs are also reduced.

[0021] (2) For the sealing assembly of the bridge-breaking oil cylinder of the waste incinerator, by adopting the connection method of bolt one, bolt two and bolt three, when the sealing assembly is not in use, only bolt one, bolt two and bolt three need to be disassembled, which is more convenient to use. Description of the Drawings

[0022] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0023] Figure 1 It is the main view schematic diagram of the structure of the present utility model;

[0024] Figure 2 It is the right view schematic diagram of the structure of the present utility model;

[0025] Figure 3 For the present utility model Figure 1 The enlarged schematic diagram at A in;

[0026] Figure 4 For the present utility model Figure 1 The enlarged schematic diagram at B in;

[0027] Figure 5 For the present utility model Figure 1 The enlarged schematic diagram at C in.

[0028] Reference Numerals: 1, bottom plate of upper sealing plate; 2, asbestos rubber sheet I; 3, upper cover plate; 4, upper sealing box; 5, upper pressing plate; 61, flat washer I; 62, flat washer II; 63, flat washer III; 71, nut I; 72, nut II; 73, nut III; 81, spring washer I; 82, spring washer II; 83, spring washer III; 91, bolt I; 92, bolt II; 93, bolt III; 10, lower sealing box; 11, lower pressing plate; 12, lower cover plate; 13, asbestos rubber sheet II; 14, bottom plate of lower sealing plate; 15, ceramic fiber filler. Detailed Implementation Manner

[0029] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0030] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the present invention.

[0031] In the description of the present invention, greater than, less than, exceeding, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0033] Please refer to Figures 1-5 , the present invention provides a technical solution: a sealing assembly for a bridge-breaking oil cylinder of a waste incinerator, including an upper sealing box 4 and a lower sealing box 10. The upper sealing box 4 is provided with a hole, and the lower sealing box 10 is provided with a hole;

[0034] The sealed connection assembly is arranged inside the upper sealed box 4 and the lower sealed box 10. The sealed connection assembly includes an upper sealing plate bottom plate 1, a first asbestos rubber plate 2, an upper cover plate 3, a ceramic fiber filler 15, a lower cover plate 12, a second asbestos rubber plate 13, and a lower sealing plate bottom plate 14. The surface of the first asbestos rubber plate 2 fits tightly with the holes on the upper sealed box 4, and the surface of the second asbestos rubber plate 13 fits tightly with the holes on the lower sealed box 10;

[0035] A plurality of first bolts 91 are threadedly connected to the surface of 1, and the surfaces of the plurality of first bolts 91 are all threadedly connected to the surface of the first asbestos rubber plate 2, and the surfaces of the plurality of first bolts 91 are all threadedly connected to the surface of the upper cover plate 3.

[0036] Plain washers 61 are sleeved on the surfaces of the plurality of first bolts 91, and the plurality of plain washers 61 are all in contact with the upper cover plate 3. Nuts 71 are threadedly connected to the surfaces of the plurality of first bolts 91, spring washers 81 are sleeved on the surfaces of the plurality of first bolts 91, the plurality of spring washers 81 are respectively in contact with the corresponding nuts 71, and the plurality of spring washers 81 are all in contact with the upper sealing plate bottom plate 1.

[0037] A plurality of the same first bolts 91 are threadedly connected to the surface of the lower cover plate 12, the surfaces of the plurality of first bolts 91 are all threadedly connected to the surface of the second asbestos rubber plate 13, and the surfaces of the plurality of first bolts 91 are all threadedly connected to the surface of the lower sealing plate bottom plate 14.

[0038] Plain washers 61 are sleeved on the surfaces of the plurality of same first bolts 91, the plurality of plain washers 61 are all in contact with the lower cover plate 12, nuts 71 are threadedly connected to the surfaces of the same plurality of first bolts 91, spring washers 81 are sleeved on the surfaces of the plurality of first bolts 91, the plurality of spring washers 81 are respectively in contact with the corresponding nuts 71, and the plurality of spring washers 81 are all in contact with the lower sealing plate bottom plate 14.

[0039] The ceramic fiber filler 15 is arranged inside the upper sealed box 4 and the lower sealed box 10. An upper pressing plate 5 is in contact with the surface of the ceramic fiber filler 15, and a lower pressing plate 11 is in contact with the surface of the ceramic fiber filler 15.

[0040] A plurality of second bolts 92 are threadedly connected to the surface of the upper pressing plate 5, the surfaces of the plurality of second bolts 92 are all threadedly connected to the inside of the ceramic fiber filler 15, and the surfaces of the plurality of second bolts 92 are all threadedly connected to the surface of the upper sealed box 4.

[0041] Plain washers 62 are sleeved on the surfaces of the plurality of second bolts 92, the plurality of plain washers 62 are all in contact with the upper sealed box 4. Nuts 72 are threadedly connected to the surfaces of the plurality of second bolts 92, spring washers 82 are sleeved on the surfaces of the plurality of second bolts 92, the plurality of spring washers 82 are respectively in contact with the corresponding nuts 72, and the plurality of spring washers 82 are all in contact with the upper pressing plate 5.

[0042] A plurality of identical bolts II (92) are threadedly connected to the surface of the lower pressing plate (11). The surfaces of the plurality of bolts II (92) are all threadedly connected to the surface of the ceramic fiber filler (15), and the surfaces of the plurality of bolts II (92) are all threadedly connected to the surface of the lower sealing box (10).

[0043] Plain washers II (62) are sleeved on the surfaces of the plurality of identical bolts II (92). The plurality of plain washers II (62) are all in contact with the lower sealing box (10). Nuts II (72) are threadedly connected to the surfaces of the plurality of bolts II (92). Spring washers II (82) are sleeved on the surfaces of the plurality of bolts II (92). The plurality of spring washers II (82) are respectively in contact with the corresponding nuts II (72), and the plurality of spring washers II (82) are all in contact with the lower pressing plate (11).

[0044] A plurality of bolts III (93) are threadedly connected to the surface of the upper sealing box (4). The surfaces of the plurality of bolts III (93) are all threadedly connected to the interior of the lower sealing box (10). Plain washers III (63) are sleeved on the surfaces of the plurality of bolts III (93). The surfaces of the plurality of plain washers III (63) are all in contact with the surface of the lower sealing box (10). Nuts III (73) are threadedly connected to the surfaces of the plurality of bolts III (93). Spring washers III (83) are sleeved on the surfaces of the plurality of bolts III (93). The surfaces of the plurality of spring washers III (83) are respectively in contact with the surfaces of the corresponding nuts III (73), and the surfaces of the plurality of spring washers III (83) are all in contact with the surface of the upper sealing box (4).

[0045] When the sealing assembly needs to be used, first, the upper sealing box (4) and the lower sealing box (10) are respectively sleeved into the oil cylinder mounting seat from above and below, so that the back circular holes are sleeved on the oil cylinder piston rod, and are fixed with plain washers III (63), nuts III (73), spring washers III (83) and bolts III (93).

[0046] Secondly, the upper sealing plate bottom plate (1), the asbestos rubber plate I (2) and the upper cover plate (3) are assembled with plain washers I (61), nuts I (71), spring washers I (81) and bolts I (91), and the upper sealing plate bottom plate is welded to the external oil cylinder bracket.

[0047] Thirdly, the lower cover plate (12), the asbestos rubber plate II (13) and the lower sealing plate bottom plate (14) are assembled with plain washers I (61), nuts I (71), spring washers I (81) and bolts I (91), and the lower sealing plate bottom plate is welded to the external oil cylinder bracket.

[0048] Subsequently, the ceramic fiber filler (15) is filled into the interiors of the upper sealing box (4) and the lower sealing box (10).

[0049] Finally, the upper pressing plate (5) and the lower pressing plate (11) are used to press the ceramic fiber filler (15), and are fixed with plain washers II (62), nuts II (72), spring washers II (82) and bolts II (92).

[0050] Through various structural improvements, the problems that the current device cannot well adapt to the telescopic movement of the oil cylinder, the current device cannot well adapt to the rotational movement of the oil cylinder along the fixed axis, and the current device is prone to damage, inconvenient to disassemble and replace, and easy to be damaged are solved, the operation stability and service life of the product are improved, and the use and maintenance and replacement costs are also reduced.

[0051] By adopting the connection method of bolt one - 91, bolt two - 92 and bolt three - 93, when the sealing component is not used, it only needs to disassemble bolt one - 91, bolt two - 92 and bolt three - 93, which is more convenient to use.

[0052] It should be noted that:

[0053] The material of the bottom plate 1 of the upper sealing plate is Q235 - B, with good strength and playing a fixing role;

[0054] The material of the asbestos rubber sheet one - 2 is asbestos rubber sheet, placed between the bottom plate 1 of the upper sealing plate and the upper cover plate 3, playing a sealing role;

[0055] The material of the upper cover plate 3 is Q235 - B, with good strength and convenient for disassembly;

[0056] The upper sealing box 4 is made of Q235 - B, a welded part with good strength. It is originally integrated with the lower sealing box 10. For the convenience of installation and disassembly, it is divided into upper and lower parts, and the upper and lower parts are arc surfaces. The function is that when the oil cylinder makes a rotational movement, the distance from the arc surface to the center of the circle remains unchanged, which is convenient for sealing. Circular holes are opened on the left and right sides and sleeved on the circular mounting seat of the oil cylinder, and it can rotate along the center of the oil cylinder seat following the oil cylinder. Circular holes are opened on the back, and the piston rod of the oil cylinder can pass through;

[0057] The upper pressing plate 5 is made of Q235 - B, pressing the ceramic fiber filler 15;

[0058] The lower sealing box 10 is a lower sealing box, a welded part with good strength. The lower sealing box 10 presses the ceramic fiber filler 15;

[0059] The material of the lower cover plate 12 is Q235 - B, with good strength and convenient for disassembly;

[0060] The asbestos rubber sheet two - 13 is placed between the lower cover plate 12 and the bottom plate 14 of the lower sealing plate, playing a sealing role;

[0061] The material of the bottom plate 14 of the lower sealing plate is Q235 - B, with good strength and playing a fixing role;

[0062] The ceramic fiber filler 15 plays a sealing role.

[0063] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the gist of the present utility model within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A sealing assembly for a bridge-breaking oil cylinder of a waste incinerator, characterized in that, Comprising: An upper sealing box (4) and a lower sealing box (10), the upper sealing box (4) is provided with holes, and the lower sealing box (10) is provided with holes; A sealing connection assembly is arranged inside the upper sealing box (4) and the lower sealing box (10). The sealing connection assembly includes an upper sealing plate bottom plate (1), an asbestos rubber plate one (2), an upper cover plate (3), a ceramic fiber filler (15), a lower cover plate (12), an asbestos rubber plate two (13) and a lower sealing plate bottom plate (14). The surface of the asbestos rubber plate one (2) is in close fit with the holes on the upper sealing box (4), and the surface of the asbestos rubber plate two (13) is in close fit with the holes on the lower sealing box (10); A plurality of bolts one (91) are threadedly connected to the surface of (1), the surfaces of the plurality of bolts one (91) are all threadedly connected to the surface of the asbestos rubber plate one (2), and the surfaces of the plurality of bolts one (91) are all threadedly connected to the surface of the upper cover plate (3).

2. The sealing assembly for the bridge-breaking oil cylinder of a waste incinerator according to claim 1, characterized in that: Flat washers one (61) are sleeved on the surfaces of the plurality of bolts one (91), the plurality of flat washers one (61) are all in contact with the upper cover plate (3), nuts one (71) are threadedly connected to the surfaces of the plurality of bolts one (91), spring washers one (81) are sleeved on the surfaces of the plurality of bolts one (91), the plurality of spring washers one (81) are respectively in contact with the corresponding nuts one (71), and the plurality of spring washers one (81) are all in contact with the upper sealing plate bottom plate (1).

3. The sealing assembly for the bridge-breaking oil cylinder of a waste incinerator according to claim 1, characterized in that: A plurality of the same bolts one (91) are threadedly connected to the surface of the lower cover plate (12), the surfaces of the plurality of bolts one (91) are all threadedly connected to the surface of the asbestos rubber plate two (13), and the surfaces of the plurality of bolts one (91) are all threadedly connected to the surface of the lower sealing plate bottom plate (14).

4. A sealing assembly for a bridge-breaking oil cylinder of a waste incinerator according to claim 1, characterized in that: Flat washers one (61) are sleeved on the surfaces of the plurality of the same bolts one (91), the plurality of flat washers one (61) are all in contact with the lower cover plate (12), nuts one (71) are threadedly connected to the surfaces of the plurality of the same bolts one (91), spring washers one (81) are sleeved on the surfaces of the plurality of bolts one (91), the plurality of spring washers one (81) are respectively in contact with the corresponding nuts one (71), and the plurality of spring washers one (81) are all in contact with the lower sealing plate bottom plate (14).

5. The sealing assembly for the bridge-breaking oil cylinder of a waste incinerator according to claim 1, characterized in that: The ceramic fiber filler (15) is arranged inside the upper sealing box (4) and the lower sealing box (10), an upper pressing plate (5) is in contact with the surface of the ceramic fiber filler (15), and a lower pressing plate (11) is in contact with the surface of the ceramic fiber filler (15).

6. A sealing assembly for a bridge-breaking oil cylinder of a waste incinerator according to claim 5, characterized in that: A plurality of bolts two (92) are threadedly connected to the surface of the upper pressing plate (5), the surfaces of the plurality of bolts two (92) are all threadedly connected to the inside of the ceramic fiber filler (15), and the surfaces of the plurality of bolts two (92) are all threadedly connected to the surface of the upper sealing box (4).

7. A sealing assembly for a bridge-breaking oil cylinder of a waste incinerator according to claim 6, characterized in that: Flat washers II (62) are sleeved on the surfaces of multiple bolts II (92). Multiple flat washers II (62) are all in contact with the upper sealing box (4). Nuts II (72) are threadedly connected to the surfaces of multiple bolts II (92). Spring washers II (82) are sleeved on the surfaces of multiple bolts II (92). Multiple spring washers II (82) are respectively in contact with the corresponding nuts II (72). Multiple spring washers II (82) are all in contact with the upper pressing plate (5).

8. A sealing assembly for a bridge-breaking oil cylinder of a waste incinerator according to claim 5, characterized in that: Multiple bolts II (92) of the same kind are threadedly connected to the surface of the lower pressing plate (11). The surfaces of multiple bolts II (92) are all threadedly connected to the surface of the ceramic fiber filler (15). The surfaces of multiple bolts II (92) are all threadedly connected to the surface of the lower sealing box (10).

9. The sealing assembly for the bridge-breaking oil cylinder of a waste incinerator according to claim 8, characterized in that: Flat washers II (62) are sleeved on the surfaces of multiple identical bolts II (92). Multiple flat washers II (62) are all in contact with the lower sealing box (10). Nuts II (72) are threadedly connected to the surfaces of multiple identical bolts II (92). Spring washers II (82) are sleeved on the surfaces of multiple bolts II (92). Multiple spring washers II (82) are respectively in contact with the corresponding nuts II (72). Multiple spring washers II (82) are all in contact with the lower pressing plate (11).

10. A sealing assembly for a bridge-breaking oil cylinder of a waste incinerator according to claim 1, characterized in that: Multiple bolts III (93) are threadedly connected to the surface of the upper sealing box (4). The surfaces of multiple bolts III (93) are all threadedly connected to the inside of the lower sealing box (10). Flat washers III (63) are sleeved on the surfaces of multiple bolts III (93). The surfaces of multiple flat washers III (63) are all in contact with the surface of the lower sealing box (10). Nuts III (73) are threadedly connected to the surfaces of multiple bolts III (93). Spring washers III (83) are sleeved on the surfaces of multiple bolts III (93). The surfaces of multiple spring washers III (83) are respectively in contact with the surfaces of the corresponding nuts III (73). The surfaces of multiple spring washers III (83) are all in contact with the surface of the upper sealing box (4).

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