A pressure-sensitive adhesive aging test device

Abstract

The present invention relates to the field of pressure-sensitive adhesive testing technology, and discloses a pressure-sensitive adhesive aging test device, including an aging box, a fixed plate fixedly installed inside the aging box, a plurality of revolution shafts rotatably installed at one side of the fixed plate, a revolution frame fixedly installed on the revolution shaft, a blowing shaft rotatably installed on the revolution frame, a blowing cylinder connected to and installed at both ends of the blowing shaft, a revolution mechanism provided at one side of the fixed plate, a rotation mechanism provided at the other side of the fixed plate, a blowing mechanism also provided on the outer wall of the aging box, an outer shaft fixedly installed at both sides of the inner wall of the aging box, an inner shaft rotatably installed inside the outer shaft, a rotating frame fixedly installed at the end of the inner shaft, and a bonding mechanism further provided between the center positions of the two rotating frames. The present invention, through the mutual cooperation of the above-mentioned aging components and the blowing mechanism, enables the aging test device to perform multiple accelerated aging tests on the pressure-sensitive adhesive, has strong practicality, and further ensures the scope of application of the aging test device.

Description

Technical Field

[0001] The invention relates to the technical field of pressure-sensitive adhesive testing, in particular to a pressure-sensitive adhesive aging testing device. Background Art

[0002] Pressure-sensitive adhesives (PSAs) are adhesives with a colloidal structure that instantly bonds to any smooth surface when pressure is applied. Furthermore, if the surface is damaged, the adhesive does not contaminate the adherend. These adhesives are called pressure-sensitive adhesives because the bonding process is extremely sensitive to pressure. Pressure-sensitive adhesives are generally not used directly for bonding adherends. Instead, they are made into various materials to create pressure-sensitive adhesive products, such as tapes and labels.

[0003] Pressure-sensitive adhesive aging performance testing includes accelerated aging (hot / cold oxygen, damp heat / cold, and light aging) and natural aging tests. Accelerated aging rapidly evaluates performance changes by simulating specific environments, while natural aging involves prolonged exposure to the elements. Current technology requires that a certain amount of pressure-sensitive adhesive samples undergo accelerated aging testing before commercial use, necessitating the use of appropriate aging test chambers. However, existing aging test chambers are simple in structure and can only perform a single type of aging test. Furthermore, they cannot guarantee uniformity during the testing process for each of these aging tests. Therefore, further improvements are needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a pressure-sensitive adhesive aging test device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The cam is provided with a plurality of rotation axes which are respectively arranged on one side of the fixing plate and the rotation axes of the fixing plate, and the plurality of rotation axes are connected to each other by the plurality of rotation axes.

[0007] As an improved solution of the present invention: the bonding mechanism includes a bonding shaft rotatably installed between two rotating frames, a bonding cylinder fixedly installed on the bonding shaft, a plurality of pressure-sensitive adhesive test pieces bonded to the bonding cylinder, one end of the bonding shaft passes through the aging box and is connected to the output end of the bonding motor, and the bonding motor is installed on the outer wall of the aging box.

[0008] As an improved solution of the present invention: the aging component includes multiple connecting shafts rotatably installed between two rotating frames, one group of connecting shafts is equipped with ultraviolet lamps, another group of connecting shafts is equipped with cooling rods, and another group of connecting shafts is equipped with heating rods.

[0009] As an improved solution of the present invention: the rotating mechanism includes a connecting gear fixed at the end position of the connecting shaft, a fixed gear is engaged with the outside of the connecting gear, and the fixed gear is fixedly installed on the outer shaft. The aging box is also equipped with a rotating motor, and the output end of the rotating motor is connected to the inner shaft.

[0010] As an improved solution of the present invention: the blowing mechanism includes a blowing cavity fixedly mounted on a revolution frame, the blowing cavity and the blowing shaft are rotatably arranged, and the two are connected to each other, and blowing pipes are installed between the multiple blowing cavities, and one of the blowing cavities is also connected to an air intake pipe, and the air intake pipe is connected to a constant humidity air box installed on the outer wall of the aging box.

[0011] As an improved solution of the present invention: the revolution mechanism includes revolution gears fixed on multiple revolution shafts, revolution timing belts are meshed and installed between the revolution gears, and the revolution mechanism also includes a revolution drive assembly.

[0012] As an improved solution of the present invention: the revolution drive assembly includes a revolution worm wheel fixedly mounted on one of the ends of the revolution shaft, a revolution worm is engaged on the outer side of the revolution worm wheel, one end of the revolution worm is connected to the output end of the revolution motor, and the revolution motor is mounted on the outer wall of the aging box.

[0013] As an improved solution of the present invention: the rotation mechanism includes multiple rotation shafts on a fixed plate, on which rotation gears and rotation pulleys are coaxially fixedly installed, and rotation synchronous belts are meshed between the rotation gears. A blowing pulley fixed on the blowing shaft is installed on the outer side of each rotation pulley through a rotation belt, and the rotation mechanism also includes a rotation drive assembly.

[0014] As an improved solution of the present invention: the self-rotating drive assembly includes a self-rotating worm wheel fixed on one of the self-rotating shafts, a self-rotating worm is engaged on the outside of the self-rotating worm wheel, one end of the self-rotating worm is connected to the output end of the self-rotating motor, and the self-rotating motor is installed on the outer wall of the aging box.

[0015] As an improved solution of the present invention: the side wall of the aging box is further provided with a door groove, and a sealing door is hingedly installed on the door groove through a hinge.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Through the cooperation between the rotation mechanism and the revolution mechanism, the position of the air blower and the pressure-sensitive adhesive specimen can be continuously changed. At the same time, with the cooperation of the blowing mechanism, air with a certain humidity can be evenly blown to the specimen, further ensuring the reliability of the aging test device;

[0018] 2. Through the cooperation of the rotating mechanism and the bonding mechanism, the pressure-sensitive adhesive specimen can be continuously rotated during the test, and the aging component will also change its motion state, ultimately ensuring the uniformity of the aging test of the pressure-sensitive adhesive specimen by the aging component;

[0019] 3. Through the mutual cooperation of the above-mentioned aging components and the blowing mechanism, the aging test device can perform multiple accelerated aging (hot / cold oxygen, wet heat / cold, light aging) tests on pressure-sensitive adhesives, which is highly practical and further ensures the applicability of the aging test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall front view structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall side structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the overall top view of the structure of the present invention;

[0023] Figure 4 It is a partial cross-sectional structural schematic diagram of the present invention;

[0024] Figure 5 Schematic diagram of the structure of the revolution mechanism in the present invention;

[0025] Figure 6 Schematic diagram of the structure of the rotation mechanism of the present invention;

[0026] Figure 7 It is a structural schematic diagram of the rotating mechanism in the present invention;

[0027] Figure 8 It is a structural schematic diagram of the aging component in the present invention.

[0028] Figure: 1, aging box; 2, rotating motor; 3, sealing door; 4, door slot; 5, fixing plate; 6, bonding motor; 7, constant humidity air box; 8, rotating motor; 9, revolving motor; 10, air inlet pipe; 11, air blower; 12, air blow hole; 13, air blow shaft; 14, air blow cavity; 15, revolving shaft; 16, revolving frame; 17, revolving gear; 18, revolving timing belt; 19, revolving worm gear; 20, revolving worm; 21, air blow Tube; 22. Hinge; 23. Rotating shaft; 24. Rotating gear; 25. Rotating timing belt; 26. Rotating pulley; 27. Rotating belt; 28. Blowing pulley; 29. ​​Rotating worm; 30. Rotating worm gear; 31. Outer shaft; 32. Fixed gear; 33. Inner shaft; 34. Rotating frame; 35. Connecting shaft; 36. Connecting gear; 37. Adhesive shaft; 38. Adhesive cylinder; 39. Refrigeration rod; 40. Ultraviolet lamp; 41. Heating rod. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, 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 internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0033] Example 1

[0034] See Figures 1 to 8 In the embodiment of the present invention, a pressure-sensitive adhesive aging test device includes an aging box 1, a fixed plate 5 is fixedly installed inside the aging box 1, and the center position of the fixed plate 5 is a hollow structure design, which is convenient for the placement of the pressure-sensitive adhesive test piece in the later stage. A plurality of revolution shafts 15 are rotatably installed on one side of the fixed plate 5, and a revolution frame 16 is fixedly installed on the revolution shaft 15. A blowing shaft 13 is rotatably installed on the revolution frame 16. The interior of the blowing shaft 13 is a hollow structure design, which facilitates the effective circulation of gas inside the blowing shaft 13. The two ends of the blowing shaft 13 are connected with a blowing cylinder 11, and the blowing cylinder 11 is connected with a plurality of blowing holes 12. One side position of the fixed plate 5 is provided with a device for driving the multiple revolution frames 16 to move synchronously. The rotating mechanism can be moved, so that the distance between the blowing shaft 13 and the pressure-sensitive adhesive specimen can be changed. The other side of the fixed plate 5 is provided with a rotation mechanism for driving multiple blowing shafts 13 to move synchronously, so that the constant humidity gas derived from the blowing shaft 13 can be sprayed more evenly to the pressure-sensitive adhesive specimen. The outer wall of the aging box 1 is also provided with a blowing mechanism for introducing gas into the blowing cylinder 11. The outer shaft 31 is fixedly installed on both sides of the inner wall of the aging box 1, and the inner shaft 33 is rotatably installed inside the outer shaft 31. The end of the inner shaft 33 is fixedly installed with a rotating frame 34, and an aging component is provided between the edge positions of the two rotating frames 34. The inner wall of the aging box 1 is also provided with a rotating mechanism for driving the aging component to move.

[0035] To ensure a variety of aging tests within the aging test apparatus, the aging component includes multiple connecting shafts 35 rotatably mounted between two rotating frames 34. One set of connecting shafts 35 is mounted with an ultraviolet lamp 40, another set of connecting shafts 35 is mounted with a cooling rod 39, and another set of connecting shafts 35 is mounted with a heating rod 41. This structure ensures temperature changes during multiple aging tests and also meets the requirements of light aging tests.

[0036] In addition, in order to further ensure the quality of the aging test of the pressure-sensitive adhesive of the aging component, the aging component is set to a moving state rather than a fixed state in this embodiment. Specifically, the rotating mechanism includes a connecting gear 36 fixed to the end position of the connecting shaft 35, and the outer side of the connecting gear 36 is meshed with a fixed gear 32, and the fixed gear 32 is fixedly mounted on the outer shaft 31. The aging box 1 is also equipped with a rotating motor 2, and the output end of the rotating motor 2 is connected to the inner shaft 33. When the rotating motor 2 is started, the inner shaft 33 rotates, thereby driving the entire rotating frame 34 to rotate. After that, under the meshing setting of the fixed gear 32 and the connecting gear 36, the multiple connecting gears 36 will drive the connecting shaft 35 to rotate, and finally the aging component rotates and revolves at the same time, so that the cooling rod 39 and the heating rod 41 can evenly produce a temperature effect on the pressure-sensitive adhesive specimen, and the ultraviolet lamp 40 can also evenly illuminate the pressure-sensitive adhesive specimen.

[0037] In one case of this embodiment, the blowing mechanism includes a blowing chamber 14 fixedly mounted on a revolving frame 16, the blowing chamber 14 and the blowing shaft 13 are rotatably arranged, and the two are interconnected, and a plurality of blowing chambers 14 are connected and installed with a blowing pipe 21, and one of the blowing chambers 14 is also connected and installed with an air inlet pipe 10, and the air inlet pipe 10 is connected and installed with a constant humidity air box 7 installed on the outer wall of the aging box 1. Through the arrangement of the above structure, the interior of the constant humidity air box 7 can continuously input air with a certain humidity into the interior of the aging box 1 through the blowing shaft 13, and the movement state of the blowing shaft 13 itself is not affected. In the above structure, the air inlet pipe 10 and the blowing pipe 21 are both designed as hose structures.

[0038] In a preferred embodiment of the present invention, the revolution mechanism includes revolution gears 17 fixed on a plurality of revolution shafts 15 , revolution timing belts 18 are meshed and installed between the revolution gears 17 , and the revolution mechanism further includes a revolution drive assembly.

[0039] Among them, the revolution drive assembly includes a revolution worm gear 19 fixedly mounted on the end of one of the revolution shafts 15, a revolution worm 20 is engaged on the outer side of the revolution worm gear 19, one end of the revolution worm 20 is connected to the output end of the revolution motor 9, and the revolution motor 9 is installed on the outer wall of the aging box 1.

[0040] The working principle of the above-mentioned revolution mechanism is: starting the revolution motor 9 directly drives the revolution worm 20 to rotate, and then engages with the revolution worm wheel 19, so that the revolution shaft 15 at the corresponding position rotates, and then under the action of multiple revolution gears 17 and the revolution synchronous belt 18, the revolution shaft 15 at other positions rotates synchronously, and finally under the action of the revolution frame 16, the position between the blowing shaft 13 and the pressure-sensitive adhesive specimen can be changed, further ensuring the applicability of the aging test device.

[0041] In addition, in order to further ensure that the blowing shaft 13 can still rotate when its position changes, so as not to affect the uniformity of the blowing shaft 13 during blowing, in this embodiment, the rotation mechanism includes multiple rotation shafts 23 on the fixed plate 5, and the rotation shafts 23 are coaxially fixed with rotation gears 24 and rotation pulleys 26. The rotation gears 24 are meshed with rotation timing belts 25. The outer side of each rotation pulley 26 is installed with a blowing pulley 28 fixed on the blowing shaft 13 through a rotation belt 27. The rotation mechanism also includes a rotation drive assembly.

[0042] Among them, the self-rotation drive assembly includes a self-rotating worm wheel 30 fixed on one of the self-rotating shafts 23, a self-rotating worm 29 is engaged on the outside of the self-rotating worm wheel 30, one end of the self-rotating worm 29 is connected to the output end of the self-rotating motor 8, and the self-rotating motor 8 is installed on the outer wall of the aging box 1.

[0043] The working principle of the above-mentioned rotation mechanism is: start the rotation motor 8, so that the rotation worm 29 will drive the rotation worm wheel 30 to rotate, thereby causing the rotation shaft 23 at the corresponding position to rotate, and then with the cooperation of multiple rotation gears 24 and the rotation synchronous belt 25, the rotation shafts 23 at other positions also rotate, and then with the cooperation of multiple rotation pulleys 26, rotation belts 27 and multiple blowing pulleys 28, the multiple blowing shafts 13 at the corresponding positions rotate, thereby ensuring the uniformity of the gas blown out by the blowing tube 11.

[0044] In addition, a door slot 4 is provided on the side wall of the aging box 1, and a sealing door 3 is hingedly installed on the door slot 4 through a hinge 22. Through the arrangement of the above structure, the staff can take and put the pressure-sensitive adhesive test piece from the aging box 1.

[0045] Example 2

[0046] In order to further ensure the test quality of the entire aging test device, the present invention also provides another embodiment. The difference between this embodiment and the above embodiment is that a bonding mechanism is further provided between the center positions of the two rotating frames 34.

[0047] The bonding mechanism includes a bonding shaft 37 rotatably mounted between two rotating frames 34, a bonding cylinder 38 fixedly mounted on the bonding shaft 37, and a plurality of pressure-sensitive adhesive test pieces bonded to the bonding cylinder 38. One end of the bonding shaft 37 passes through the aging box 1 and is connected to the output end of the bonding motor 6. In terms of the specific structural setting, the end of the bonding shaft 37 away from the bonding motor 6 is rotatably mounted on the center position of the rotating frame 34, and the other end passes through the inner shaft 33 at the corresponding position and is mounted on the bonding motor 6. The bonding motor 6 is mounted on the outer wall of the aging box 1. First, a plurality of standard pressure-sensitive adhesive test pieces to be tested are pasted on the bonding cylinder 38, and then the bonding motor 6 is started. Then, with the cooperation of the bonding shaft 37, the bonding cylinder 38 is caused to rotate, thereby ensuring the quality of the pressure-sensitive adhesive test pieces during the aging test.

[0048] To summarize, the pressure-sensitive adhesive specimen is first evenly bonded to the adhesive tube 38, and then the adhesive tube 38 is rotated under the action of the bonding mechanism. Then, the corresponding parameters are set according to the requirements of the accelerated aging test, and then the aging test is performed on the pressure-sensitive adhesive specimen.

[0049] During the hot / cold oxygen aging test, the heating rod 41 is set to a desired temperature (e.g., 70°C, 85°C, 100°C), or the cooling rod 39 is set to a desired temperature (e.g., -20°C, -40°C, -70°C), while normal air (with an oxygen content of approximately 21% and normal humidity) is introduced into the constant humidity chamber 7. This state is maintained for a period of time (ranging from several days to several weeks). During or after the aging process, the pressure-sensitive adhesive is tested for changes in performance indicators such as peel strength, sustained tack, and initial tack. A significant decrease in peel strength, a shortened sustained tack, or a decrease in initial tack indicates that the pressure-sensitive adhesive has aged.

[0050] During the damp heat / cold aging test, set the heating rod 41 to a specific temperature (e.g., 40°C, 50°C, etc.) or the cooling rod 39 to a specific temperature (e.g., -20°C, -40°C, etc.). Simultaneously, introduce air of a specific humidity (e.g., 70% RH, 90% RH, etc.) into the constant humidity chamber 7. For example, age the test at 50°C, 90% RH for 14 days. Periodically remove samples and test for changes in performance after aging in the damp heat / cold environment, such as a decrease in bond strength and softening or hardening of the adhesive layer.

[0051] When conducting the light aging test, the irradiation intensity of the ultraviolet lamp 40 is set to 100mW / cm 2 , and set the aging time (such as 1000 hours, 2000 hours, etc.). Observe the appearance changes of the pressure-sensitive adhesive after light aging, such as yellowing and brittleness, and test the changes in its bonding properties.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pressure-sensitive adhesive aging test device, comprising an aging box (1), characterized in that: A fixed plate (5) is fixedly installed inside the aging box (1), and the center position of the fixed plate (5) is designed as a hollow slot structure. A plurality of revolution shafts (15) are rotatably installed at one side of the fixed plate (5), and a revolution frame (16) is fixedly installed on the revolution shaft (15). A blowing shaft (13) is rotatably installed on the revolution frame (16). The interior of the blowing shaft (13) is designed as a hollow structure. A blowing cylinder (11) is connected and installed at both ends of the blowing shaft (13). A plurality of blowing holes (12) are connected and arranged on the blowing cylinder (11). A revolution mechanism for driving the plurality of revolution frames (16) to move synchronously is arranged at one side of the fixed plate (5). A rotation mechanism for driving a plurality of blowing shafts (13) to move synchronously is provided on the other side of the plate (5), a blowing mechanism for introducing gas into the blowing cylinder (11) is also provided on the outer wall of the aging box (1), outer shafts (31) are fixedly installed on both sides of the inner wall of the aging box (1), an inner shaft (33) is rotatably installed inside the outer shaft (31), a rotating frame (34) is fixedly installed at the end of the inner shaft (33), an aging component is provided between the edge positions of the two rotating frames (34), the inner wall of the aging box (1) is also provided with a rotating mechanism for driving the aging component to move, and a bonding mechanism is also provided between the center positions of the two rotating frames (34); The bonding mechanism comprises a bonding shaft (37) rotatably mounted between two rotating frames (34), a bonding cylinder (38) fixedly mounted on the bonding shaft (37), a plurality of pressure-sensitive adhesive test pieces bonded to the bonding cylinder (38), one end of the bonding shaft (37) passing through the aging box (1) and connected to the output end of the bonding motor (6), and the bonding motor (6) is mounted on the outer wall of the aging box (1).

2. A pressure-sensitive adhesive aging test device according to claim 1, characterized in that: The aging component includes a plurality of connecting shafts (35) rotatably mounted between two rotating frames (34), wherein one group of connecting shafts (35) is mounted with an ultraviolet lamp (40), another group of connecting shafts (35) is mounted with a cooling rod (39), and another group of connecting shafts (35) is mounted with a heating rod (41).

3. A pressure-sensitive adhesive aging test device according to claim 2, characterized in that: The rotating mechanism includes a connecting gear (36) fixed at an end position of a connecting shaft (35), a fixed gear (32) meshing with the outer side of the connecting gear (36), and the fixed gear (32) is fixedly mounted on the outer shaft (31). The aging box (1) is also equipped with a rotating motor (2), and the output end of the rotating motor (2) is connected to the inner shaft (33).

4. A pressure-sensitive adhesive aging test device according to claim 3, characterized in that: The blowing mechanism includes a blowing cavity (14) fixedly mounted on a revolution frame (16), the blowing cavity (14) and the blowing shaft (13) being rotatably arranged and being in communication with each other, a plurality of blowing cavities (14) being connected and installed with blowing pipes (21), one of the blowing cavities (14) being further connected and installed with an air inlet pipe (10), and the air inlet pipe (10) being in communication with a constant humidity air box (7) mounted on an outer wall of the aging box (1).

5. A pressure-sensitive adhesive aging test device according to claim 4, characterized in that: The revolution mechanism comprises revolution gears (17) fixed on a plurality of revolution shafts (15), revolution timing belts (18) are meshed and installed between the revolution gears (17), and the revolution mechanism further comprises a revolution drive assembly.

6. A pressure sensitive adhesive aging test device according to claim 5, characterized in that: The revolution drive assembly includes a revolution worm wheel (19) fixedly mounted on the end of one of the revolution shafts (15), a revolution worm (20) meshing on the outer side of the revolution worm wheel (19), one end of the revolution worm (20) being connected to the output end of the revolution motor (9), and the revolution motor (9) being mounted on the outer wall of the aging box (1).

7. A pressure sensitive adhesive aging test device according to claim 1, characterized in that: The self-rotation mechanism comprises a plurality of self-rotation shafts (23) on a fixed plate (5), self-rotation gears (24) and self-rotation pulleys (26) being coaxially fixedly mounted on the self-rotation shafts (23), self-rotation timing belts (25) being meshed between the self-rotation gears (24), and a blowing pulley (28) fixed on the blowing shaft (13) being mounted on the outer side of each self-rotation pulley (26) via a self-rotation belt (27). The self-rotation mechanism also comprises a self-rotation drive assembly.

8. A pressure-sensitive adhesive aging test device according to claim 7, characterized in that: The self-rotating drive assembly includes a self-rotating worm wheel (30) fixed on one of the self-rotating shafts (23), a self-rotating worm (29) is meshed on the outside of the self-rotating worm wheel (30), one end of the self-rotating worm (29) is connected to the output end of the self-rotating motor (8), and the self-rotating motor (8) is installed on the outer wall of the aging box (1).

9. A pressure sensitive adhesive aging test device according to claim 1, characterized in that: The side wall of the aging box (1) is further provided with a door slot (4), and a sealing door (3) is hingedly mounted on the door slot (4) via a hinge (22).

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