Tank type defoaming machine with upper door and lower door

Abstract

The invention relates to the technical field of defoaming machines, in particular to a tank type defoaming machine with an upper door and a lower door, and mainly solves the technical problem that an existing tank type defoaming machine with the upper door and the lower door is high in maintenance cost. The tank type bubble removing machine comprises a rack, a cavity shell, a cavity door, a connecting assembly and a lifting driving assembly, the connecting assembly comprises a vertical guide rail pair, a front-back guide rail pair and a front-back driving pair, the lifting driving assembly comprises a lifting driving pair, a connecting rod and a supporting guide rail pair, the two sets of lifting driving pairs support the cavity door through the connecting rod, and the supporting guide rail pair is arranged on the connecting rod. The through groove formed in the sliding block of the supporting guide rail pair is in contact fit with the bottom end of the cavity door, and even if the two lifting driving pairs are asynchronous and the connecting rod is inclined, the generated torque cannot be transmitted to the cavity door, so that a cavity door guide rail and a fastener are prevented from bearing larger extra load, and the service life of the cavity door is prolonged. Therefore, the defoaming machine does not need to be frequently debugged, overhauled and subjected to other equipment maintenance, and the equipment maintenance cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of defoaming machines, in particular to a tank-type defoaming machine with doors opened up and down. Background Art

[0002] The tank debubbling machine is a device that places the product on a multi-layer tray, then places the multi-layer tray in the tank and eliminates bubbles through high temperature and high pressure. The tank debubbling machine is equipped with a chamber door on one side or both sides, and the chamber door is mostly opened and closed by moving up and down.

[0003] The existing tank-type defoamer with upper and lower doors uses two cylinders located on the left and right sides of the chamber door, which are directly connected to the chamber door to drive the chamber door to rise and fall. This structure requires that the speed of the two cylinders is completely consistent, otherwise the chamber door will shake left and right, causing the guide rails and fasteners of the chamber door to bear a large additional load, which is easy to cause structural damage and failure. Therefore, this defoamer requires regular and frequent debugging, inspection and other equipment maintenance, and the maintenance cost is high. Summary of the invention

[0004] In order to overcome the technical defect of high maintenance cost of the existing tank-type defoaming machine with upper and lower doors, the present invention provides a tank-type defoaming machine with upper and lower doors.

[0005] The tank-type defoaming machine with upper and lower doors provided by the present invention comprises: frame; A chamber housing, which is fixed to the frame and arranged with its axis front to back; a cavity door located at an end of the cavity shell; A connecting assembly, comprising a vertical guide rail pair, a front and rear guide rail pair and a front and rear drive pair, wherein the track of the vertical guide rail pair is fixed on the frame, the slider of the vertical guide rail pair is connected to the track of the front and rear guide rail pair, the slider of the front and rear guide rail pair is connected to the cavity door, the fixed part of the front and rear drive pair is fixed on the track of the front and rear guide rail pair, and the moving part of the front and rear drive pair is connected to the slider of the front and rear guide rail pair; A lifting drive assembly comprises a lifting drive pair, a connecting rod and a supporting guide rail pair. The lifting drive pair is provided with two sets and is symmetrically distributed on both sides of the cavity door. The fixed part of the lifting drive pair is connected to the frame, and the moving parts of the two lifting drive pairs are connected through the connecting rod. The connecting rod and the moving parts of the two lifting drive pairs are hinged and the hinge axis is arranged front to back. The guiding direction of the supporting guide rail pair is parallel to the axis of the cavity shell. The track of the supporting guide rail pair is fixed on the connecting rod. The upper surface of the slider of the supporting guide rail pair is provided with a through groove arranged in the left and right directions, and the bottom end of the cavity door is placed in the through groove.

[0006] Optionally, the lifting drive pair is a telescopic cylinder.

[0007] Optionally, the piston rod of the telescopic cylinder extends below the cylinder body, the top of the cylinder body of the telescopic cylinder is movably connected to the frame through a hinge seat and the axis of the hinge seat is arranged left and right, and the bottom end of the piston rod of the telescopic cylinder is connected to the connecting rod.

[0008] Optionally, a locking assembly is further included, which includes a locking rod, which is installed on the frame and can be driven to move in the front-to-back direction, and the locking rod is used to block the lower side of the cavity door when the cavity door is in a closed state.

[0009] Optionally, the locking assembly also includes a spring-loaded single-acting cylinder, the cylinder body of which is fixed on the frame and the piston rod drives the locking rod to move forward and backward. The air chamber of the spring-loaded single-acting cylinder is provided with two air inlet channels, one of which is connected to the air source through an electromagnetic valve, and the other is connected to the defoaming chamber.

[0010] Optionally, the locking assembly also includes a locking sleeve fixed on the frame, the locking sleeve is arranged front and back, the locking rod is gap inserted in the locking sleeve, the piston rod of the spring-type single-acting cylinder extends into the locking sleeve and is connected to the locking rod, and the diameter of the locking rod is larger than the diameter of the piston rod of the spring-type single-acting cylinder.

[0011] Optionally, it also includes an exhaust component, which includes an exhaust pipe, one end of which is connected to the defoaming chamber and the other end is connected to the outside atmosphere, and a normally open solenoid valve is provided on the exhaust pipe.

[0012] Optionally, a manual ball valve is also provided on the exhaust pipe, and the manual ball valve is connected in parallel with the normally open solenoid valve.

[0013] Optionally, it also includes an air flotation component, which includes an air flotation seat, a floating column and a sensor. The air flotation seat is fixed on the top of the cavity shell and is provided with a vertically arranged air flotation plug hole. The floating column is gap inserted in the air flotation plug hole and a sealing plate with a diameter larger than the air flotation plug hole is provided at the bottom. A baffle is also fixed on the floating column, which is located above the air flotation seat and is used to prevent the floating column from falling. The sensor is used to collect a floating column in place signal when the floating column extends to the outermost side. The sensor is communicatively connected to the normally open solenoid valve to control the normally open solenoid valve to open when the sensor signal disappears.

[0014] Optionally, a sealing ring is provided on the upper surface of the sealing plate.

[0015] The technical solution provided by the present invention has the following advantages compared with the prior art: The tank-type defoamer with upper and lower doors provided by the present invention has two sets of lifting drive pairs supporting the cavity door through a connecting rod, and a supporting guide pair is provided on the connecting rod, and the connecting rod contacts and cooperates with the bottom end of the cavity door through a through groove provided on the slider of the supporting guide pair. Even if the two sets of lifting drive pairs are out of sync and cause the connecting rod to tilt, the torque generated will not be transmitted to the cavity door, thereby avoiding the cavity door guide rail and fasteners from bearing a large additional load. In this way, the defoamer does not need to be frequently debugged, repaired, and other equipment maintenance, greatly reducing the equipment maintenance cost. At the same time, the defoamer can avoid the forward and backward movement of the cavity door when it is opened or closed through the supporting guide pair, and the structural design is reasonable and feasible. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram showing the structure of a tank-type defoamer according to an embodiment of the present invention; Figure 2 A schematic diagram showing the structure of a cavity door and related components in an embodiment of the present invention; Figure 3 A schematic diagram showing the structure of a locking assembly in an embodiment of the present invention; Figure 4 A schematic diagram showing the structure of an exhaust assembly in an embodiment of the present invention; Figure 5 A schematic diagram showing the structure of an air flotation assembly in an embodiment of the present invention.

[0019] In the figure: 1. Frame; 2. Cavity shell; 3. Cavity door; 4. Connecting assembly; 41. Vertical guide pair; 42. Front and rear guide pair; 43. Front and rear drive pair; 5. Lifting drive assembly; 51. Lifting drive pair; 52. Connecting rod; 53. Supporting guide pair; 54. Articulated seat; 6. Locking assembly; 61. Locking rod; 62. Spring-loaded single-acting cylinder; 63. Locking sleeve; 7. Exhaust assembly; 71. Exhaust pipe; 72. Normally open solenoid valve; 73. Manual ball valve; 8. Air flotation assembly; 81. Air flotation seat; 82. Floating column; 83. Sensor; 84. Sealing plate; 85. Blocker; 86. Sealing ring. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0021] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Combine the following Figures 1 to 5 The specific embodiments of the present invention are described in detail.

[0024] The present embodiment provides a tank-type defoaming machine with doors opening up and down, comprising a frame 1, a chamber shell 2, a chamber door 3, a connecting component 4 and a lifting drive component 5.

[0025] The chamber housing 2 is fixed on the frame 1 and the axes are arranged front to back.

[0026] It should be noted that the chamber shell 2 may be open at one end and be provided with one chamber door 3 , or may be open at both ends and be provided with two chamber doors 3 .

[0027] The cavity door 3 is located at the end of the cavity shell 2 .

[0028] It should be noted that the chamber door 3 and the connecting assembly 4 and the lifting drive assembly 5 are arranged correspondingly, that is, each chamber door 3 is correspondingly provided with a connecting assembly 4 and a lifting drive assembly 5 .

[0029] The connection assembly 4 includes a vertical guide pair 41, a front-rear guide pair 42 and a front-rear drive pair 43. The track of the vertical guide pair 41 is fixed on the frame 1. The slider of the vertical guide pair 41 is connected to the track of the front-rear guide pair 42. The slider of the front-rear guide pair 42 is connected to the cavity door 3. The fixed part of the front-rear drive pair 43 is fixed on the track of the front-rear guide pair 42. The moving part of the front-rear drive pair 43 is connected to the slider of the front-rear guide pair 42. When in action, the front-rear drive pair 43 drives the cavity door 3 to move in the front-rear direction to be close to the cavity shell 2 or to be separated from the cavity shell 2. When the cavity door 3 moves forward and backward, it is guided and limited by the front-rear guide pair 42. After the cavity door 3 is separated from the cavity shell 2, it moves in the vertical direction. When the cavity door 3 moves vertically, it is guided and limited by the vertical guide pair 41.

[0030] It is easy to understand that the guide rail pair is a mature structure in the art, including a rail and a slider slidably connected to the rail.

[0031] Specifically, the front and rear driving pairs 43 of this embodiment are cylinders.

[0032] Among them, the lifting drive assembly 5 includes a lifting drive pair 51, a connecting rod 52 and a supporting guide pair 53. The lifting drive pair 51 is provided with two sets and is symmetrically distributed on both sides of the chamber door 3. The fixed part of the lifting drive pair 51 is connected to the frame 1, and the moving parts of the two lifting drive pairs 51 are connected through the connecting rod 52. The connecting rod 52 and the moving parts of the two lifting drive pairs 51 are all hinged and the hinge axis is arranged front and back. The guiding direction of the supporting guide pair 53 is parallel to the axis of the chamber shell 2. The track of the supporting guide pair 53 is fixed on the connecting rod 52. The upper surface of the slider of the supporting guide pair 53 is provided with a through groove arranged in the left and right directions, and the bottom end of the chamber door 3 is placed in the through groove. When in action, the two lifting drive pairs 51 drive the connecting rod 52 and the supporting guide pair 53 to rise and fall, thereby driving the chamber door 3 to rise and fall.

[0033] It is easy to understand that the cavity door 3 is always supported in the through groove under the action of gravity.

[0034] It is easy to understand that a through groove is a group of grooves with open ends at opposite ends. For example, the through grooves in the present embodiment are arranged in left and right directions, that is, both left and right ends of the through grooves are open. In this way, even if the connecting rod 52 is tilted, since the through grooves only limit the cavity door 3 in the front-to-back direction, the torque generated by the tilt of the connecting rod 52 will not be transmitted to the cavity door 3.

[0035] It should be noted that since the process of opening the cavity door 3 is to move back and forth to separate from the cavity shell 2 and then to rise and fall vertically, and the through groove limits the cavity shell 2 in the front and rear directions, the main function of the support guide pair 53 is to avoid the front and rear movement of the cavity door 3 to ensure the feasibility of the structural design.

[0036] It is easy to understand that the end of the connecting rod 52 is hinged to the moving part of the lifting drive pair 51, and its main purpose is to avoid structural failure due to the rigid connection when the connecting rod 52 tilts due to the asynchronous movement of the two lifting drive pairs 51.

[0037] Specifically, the lifting drive pair 51 of this embodiment is a telescopic cylinder.

[0038] More specifically, the piston rod of the telescopic cylinder of this embodiment extends below the cylinder body, the top of the cylinder body of the telescopic cylinder is movably connected to the frame 1 through a hinge seat 54, and the axis of the hinge seat 54 is arranged left and right, and the bottom end of the piston rod of the telescopic cylinder is connected to the connecting rod 52. The cylinder body of the telescopic cylinder is hinged to the frame 1, and gravity can be used to ensure the verticality of the cylinder body, thereby avoiding the cavity door 3 from bearing additional loads due to poor verticality of the telescopic cylinder installation.

[0039] In addition, the tank-type defoamer of this embodiment is further provided with a locking assembly 6, which includes a locking rod 61, which is mounted on the frame 1 and can be driven to move in the front-rear direction, and the locking rod 61 is used to block the lower side of the chamber door 3 when the chamber door 3 is in a closed state. The locking rod 61 locks and positions the chamber door 3 by blocking the lower side of the chamber door 3, and the installation accuracy requirement is lower than that of the conventional shaft hole matching.

[0040] Specifically, the locking assembly 6 of this embodiment also includes a spring-type single-acting cylinder 62, the cylinder body of the spring-type single-acting cylinder 62 is fixed on the frame 1 and the piston rod drives the locking rod 61 to move forward and backward. The air chamber of the spring-type single-acting cylinder 62 is provided with two air inlet channels, one of which is connected to the air source through the solenoid valve, and the other is connected to the defoaming cavity. When in action, the air source delivers high-pressure gas to the air chamber of the spring-type single-acting cylinder 62 through the solenoid valve, and at the same time, the high pressure in the defoaming cavity will also spread to the air chamber of the spring-type single-acting cylinder 62, which provides a double guarantee. Even if the solenoid valve malfunctions and stops supplying air to the air chamber, the high-pressure gas in the defoaming cavity will still be delivered to the air chamber to ensure the extension of the locking rod 61, thereby improving the safety protection capability of the defoaming machine.

[0041] More specifically, the locking assembly 6 of the present embodiment further includes a locking sleeve 63 fixed on the frame 1, the locking sleeve 63 is arranged front and back, the locking rod 61 is inserted into the locking sleeve 63, the piston rod of the spring-type single-acting cylinder 62 extends into the locking sleeve 63 and is connected to the locking rod 61, and the diameter of the locking rod 61 is larger than the diameter of the piston rod of the spring-type single-acting cylinder 62. By adding the locking sleeve 63, the locking rod 61 used to directly block the descent of the chamber door 3 and the piston rod of the spring-type single-acting cylinder 62 can be independently designed in diameter, and the diameter of the locking rod 61 is designed to be larger than the diameter of the piston rod, which can not only ensure the support capacity for the chamber door 3, but also avoid the excessive cost caused by the thick piston rod design.

[0042] In addition, the tank-type defoamer of this embodiment is further provided with an exhaust assembly 7, which includes an exhaust pipe 71, one end of which is connected to the defoaming cavity and the other end is connected to the outside atmosphere. A normally open solenoid valve 72 is provided on the exhaust pipe 71.

[0043] It is easy to understand that the normally open solenoid valve 72, that is, when the solenoid valve signal is cut off or the equipment is powered off, the normally open solenoid valve 72 automatically opens to ensure that the defoaming chamber is connected to the outside atmosphere and the pressure is consistent, effectively avoiding pressurized operation of the chamber door 3 caused by human operating errors, eliminating the safety hazards caused by pressurized operation of the chamber, thereby ensuring the personal safety of the operator.

[0044] Furthermore, a manual ball valve 73 is also provided on the exhaust pipe 71 of this embodiment, and the manual ball valve 73 is connected in parallel with the normally open electromagnetic valve 72. The manual ball valve 73 is a backup structure, mainly used for emergency pressure relief when the electromagnetic valve fails or the equipment has problems.

[0045] In addition, the tank-type defoamer of this embodiment also includes an air flotation component 8, which includes an air flotation seat 81, a floating column 82 and a sensor 83. The air flotation seat 81 is fixed on the top of the cavity shell 2 and is provided with a vertically arranged air flotation plug hole. The floating column 82 is inserted into the air flotation plug hole and a sealing plate 84 with a diameter larger than the air flotation plug hole is provided at the bottom. A baffle 85 is also fixed on the floating column 82, which is located above the air flotation seat 81 and is used to prevent the floating column 82 from falling. The sensor 83 is used to collect the floating column 82 in place signal when the floating column 82 extends to the outermost side. The sensor 83 is communicated with the normally open solenoid valve 72 to control the normally open solenoid valve 72 to open when the sensor 83 signal disappears. When in operation, the high pressure in the defoaming chamber causes the floating column 82 to extend outward until the sealing plate 84 fits the end of the air flotation plug hole. At this time, the floating column 82 is at the outermost side, and the sealing plate 84 seals the air flotation plug hole. At the same time, the sensor 83 detects the floating column 82 signal; when the signal suddenly disappears, it means that the equipment stops operating or the equipment fails, causing the air pressure in the defoaming chamber to drop. Subsequently, the operator needs to open the chamber door 3 for maintenance or subsequent operations. Therefore, in this embodiment, the sensor 83 is connected to the normally open solenoid valve 72 to synchronously open the normally open solenoid valve 72, thereby avoiding the subsequent operation of the chamber door 3 under pressure by personnel, thereby improving the safety factor. In addition, when the signal suddenly disappears, the sealing plate 84 of the floating column 82 is separated from the air flotation plug hole, and the inside and outside of the defoaming chamber are connected through the gap between the floating column 82 and the air flotation plug hole, which is also more conducive to reducing the pressure difference inside and outside the defoaming chamber.

[0046] Specifically, in this embodiment, a sealing ring 86 is provided on the upper surface of the sealing plate 84 to ensure that the sealing plate 84 can seal the air flotation plug hole when the floating column 82 is at the outermost side.

[0047] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A tank-type defoaming machine with upper and lower doors, characterized in that: include: Rack(1); A chamber shell (2) fixed on the frame (1) and arranged with its axis front to back; A cavity door (3) located at an end of the cavity shell (2); A connecting assembly (4), comprising a vertical guide rail pair (41), a front and rear guide rail pair (42) and a front and rear drive pair (43), wherein the track of the vertical guide rail pair (41) is fixed on the frame (1), the slider of the vertical guide rail pair (41) is connected to the track of the front and rear guide rail pair (42), the slider of the front and rear guide rail pair (42) is connected to the cavity door (3), the fixed part of the front and rear drive pair (43) is fixed on the track of the front and rear guide rail pair (42), and the movable part of the front and rear drive pair (43) is connected to the slider of the front and rear guide rail pair (42); A lifting drive assembly (5), comprising a lifting drive pair (51), a connecting rod (52) and a supporting guide rail pair (53); the lifting drive pair (51) is provided with two sets and is symmetrically distributed on both sides of the chamber door (3); the fixed part of the lifting drive pair (51) is connected to the frame (1); the movable parts of the two lifting drive pairs (51) are connected via the connecting rod (52); the connecting rod (52) and the movable parts of the two lifting drive pairs (51) are hinged, and the hinge axis is arranged front to back; the guiding direction of the supporting guide rail pair (53) is parallel to the axis of the chamber shell (2); the track of the supporting guide rail pair (53) is fixed on the connecting rod (52); the upper surface of the slider of the supporting guide rail pair (53) is provided with a through groove arranged in the left and right directions; the bottom end of the chamber door (3) is placed in the through groove.

2. The tank-type defoaming machine with upper and lower doors according to claim 1, characterized in that: The lifting drive pair (51) is a telescopic cylinder.

3. The tank-type defoaming machine with upper and lower doors according to claim 2, characterized in that: The piston rod of the telescopic cylinder extends below the cylinder body, the top end of the cylinder body of the telescopic cylinder is movably connected to the frame (1) via a hinge seat (54), and the axis of the hinge seat (54) is arranged left and right, and the bottom end of the piston rod of the telescopic cylinder is connected to the connecting rod (52).

4. The tank-type defoaming machine with upper and lower doors according to any one of claims 1 to 3, characterized in that: The machine also comprises a locking assembly (6), wherein the locking assembly (6) comprises a locking rod (61), wherein the locking rod (61) is mounted on the frame (1) and can be driven to move in a front-to-rear direction, and wherein the locking rod (61) is used to block the lower side of the chamber door (3) when the chamber door (3) is in a closed state.

5. The tank-type defoaming machine with upper and lower doors according to claim 4, characterized in that: The locking assembly (6) further comprises a spring-type single-acting cylinder (62), the cylinder body of the spring-type single-acting cylinder (62) being fixed on the frame (1) and the piston rod driving the locking rod (61) to move forward and backward, and the air chamber of the spring-type single-acting cylinder (62) being provided with two air inlet channels, one of which is connected to an air source via a solenoid valve and the other is connected to a defoaming chamber.

6. The tank-type defoaming machine with upper and lower doors according to claim 5, characterized in that: The locking assembly (6) further comprises a locking sleeve (63) fixed on the frame (1); the locking sleeves (63) are arranged front and rear; the locking rod (61) is inserted into the locking sleeve (63) with a gap; the piston rod of the spring-type single-acting cylinder (62) extends into the locking sleeve (63) and is connected to the locking rod (61); the diameter of the locking rod (61) is greater than the diameter of the piston rod of the spring-type single-acting cylinder (62).

7. The tank-type defoaming machine with upper and lower doors according to any one of claims 1 to 3, characterized in that: It also comprises an exhaust assembly (7), the exhaust assembly (7) comprising an exhaust pipe (71), one end of the exhaust pipe (71) being in communication with the defoaming cavity and the other end of the exhaust pipe (71) being in communication with the outside atmosphere, and a normally open electromagnetic valve (72) being provided on the exhaust pipe (71).

8. The tank-type defoaming machine with upper and lower doors according to claim 7, characterized in that: The exhaust pipe (71) is also provided with a manual ball valve (73), and the manual ball valve (73) is connected in parallel with the normally open solenoid valve (72).

9. The tank-type defoaming machine with upper and lower doors according to claim 7, characterized in that: The invention also comprises an air flotation assembly (8), wherein the air flotation assembly (8) comprises an air flotation seat (81), a floating column (82) and a sensor (83); the air flotation seat (81) is fixed on the top of the cavity shell (2) and is provided with a vertically arranged air flotation plug hole; the floating column (82) is inserted into the air flotation plug hole and is provided with a sealing plate (84) having a diameter larger than the air flotation plug hole at the bottom; a stopper (85) is also fixed on the floating column (82) and is located above the air flotation seat (81) and is used to prevent the floating column (82) from falling; the sensor (83) is used to collect a signal indicating that the floating column (82) is in place when the floating column (82) extends to the outermost side; the sensor (83) is connected to the normally open solenoid valve (72) for communication so as to control the normally open solenoid valve (72) to open when the sensor (83) signal disappears.

10. The tank-type defoaming machine with upper and lower doors according to claim 9, characterized in that: A sealing ring (86) is provided on the upper surface of the sealing plate (84).

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