Corrugated carton printing ink wear resistance detection instrument

Abstract

The utility model relates to the technical field of ink printing, in particular to a corrugated case ink wear resistance detection instrument. The utility model provides a corrugated case ink wear resistance detection instrument which comprises a base, the top surface of the base is connected with the bottom surface of a top plate through a telescopic rod, and the bottom surface of the top plate is provided with a blocking frame; the friction assembly comprises a friction block and a motor, the friction block is connected with a rotating shaft of the motor, and the motor is arranged on the top plate; the clamping assembly comprises a clamping frame and a sliding plate, the clamping frame is detachably fixed to the top face of the sliding plate, the sliding plate is arranged on the top face of the base, and the top face of the sliding plate is used for containing a paperboard of a corrugated carton; and the ash removal assembly is arranged on the blocking frame, and the ash removal assembly is used for removing chippings and dust. The problems that in the wear resistance test, a large amount of chippings and dust generated by friction affect the accuracy of the test result and the service life of the test device are solved.

Description

An instrument for testing the abrasion resistance of inks in corrugated cardboard boxes Technical Field

[0001] This utility model relates to the field of ink printing technology, and in particular to an instrument for testing the abrasion resistance of inks used in corrugated cardboard boxes. Background Technology

[0002] Ink is the substance used to form graphic information during the printing process. Therefore, ink plays an important role in the printing process, directly determining the tone, color, and clarity of the image on the printed material.

[0003] However, for example, during the transportation and handling of corrugated cardboard boxes, the ink on the surface of the corrugated cardboard boxes will be subjected to friction and scratches, causing the ink pigments to fall off. Therefore, after the ink processing of corrugated cardboard boxes, the adhesion ability of the ink on the corrugated cardboard boxes is usually tested by an abrasion resistance testing device.

[0004] Currently, existing ink abrasion resistance testing devices test the adhesion of ink on corrugated cardboard boxes by friction. During the friction process, a large amount of debris and dust are generated, which affects the accuracy of the test results and the service life of the testing device.

[0005] Therefore, how to provide a test instrument for the abrasion resistance of corrugated cardboard inks, and how to reduce the impact of the large amount of debris and dust generated during the abrasion test on the accuracy of the test results and the service life of the test device, is a technical problem that urgently needs to be solved. Summary of the Invention

[0006] This invention provides an instrument for testing the abrasion resistance of inks in corrugated cardboard boxes, which solves the problem that the large amount of debris and dust generated by friction during abrasion resistance testing affects the accuracy of test results and the service life of the testing device.

[0007] This utility model provides a system comprising: a base, the top surface of which is connected to the bottom surface of a top plate via a telescopic rod, and a blocking frame provided on the bottom surface of the top plate;

[0008] A friction assembly, comprising a friction block and a motor, wherein the friction block is connected to the rotating shaft of the motor, and the motor is mounted on the top plate;

[0009] A clamping assembly, comprising a clamping frame and a sliding plate, wherein the clamping frame is detachably fixed to the top surface of the sliding plate, the sliding plate is disposed on the top surface of the base, and the top surface of the sliding plate is used to place the cardboard of the corrugated carton;

[0010] A dust removal component is disposed on the blocking frame and is used to clean debris and dust.

[0011] In one possible implementation, the friction assembly further includes a reciprocating lead screw and a first bushing, the reciprocating lead screw being connected to the rotating shaft of the motor, the first bushing being disposed on the reciprocating lead screw, and the first bushing being connected to the friction block.

[0012] In one possible implementation, the friction assembly further includes a rotating rod that passes through a first through slot on the top plate, one end of which is rotatably disposed on the bottom surface of the first bushing, and the other end of which is fixedly connected to the top surface of the friction block.

[0013] In one possible implementation, the friction assembly further includes a second bushing. The reciprocating screw is provided with a first reciprocating thread and a second reciprocating thread. The first bushing is disposed on the first reciprocating thread, and the second bushing is disposed on the second reciprocating thread. The bottom of the second bushing is connected to the connecting frame via a connecting bracket. The connecting bracket passes through a second through slot on the top plate. A toothed plate is disposed inside the connecting frame. A gear is disposed on the rotating rod, and the gear meshes with the toothed plate.

[0014] In one possible implementation, the toothed plate includes a first side tooth and a second side tooth. The first side tooth is disposed on the inner sidewall of the connecting frame in the length direction and is located close to the sidewall of the connecting frame in the width direction. The first side tooth and the second side tooth are centrally symmetrical about the geometric center point of the connecting frame.

[0015] In one possible implementation, the clamping assembly further includes a telescopic cylinder, the telescopic end of which is connected to the sliding plate via a connecting rod. The telescopic cylinder is disposed on the bottom surface of the base, and the sliding plate slides on the base.

[0016] In one possible implementation, the base is provided with a third through groove, and the connecting rod passes through the third through groove to connect with the telescopic end of the telescopic cylinder.

[0017] In one possible implementation, the dust removal assembly further includes a blower and an exhaust fan, the blower being disposed on the bottom surface of the top plate, the blower being disposed on the outer side wall of the barrier frame, and the blower being connected to the barrier frame via a telescopic tube.

[0018] In one possible implementation, a storage box is provided below the exhaust fan, and the storage box contains a storage bag and a filter.

[0019] In one possible implementation, a sealing strip is provided at the position where the blocking frame contacts the top surface of the base, and a groove is provided on the top surface of the base at the position corresponding to the sealing strip, and a sealing groove is provided in the groove.

[0020] The beneficial effects of this invention are as follows: First, the telescopic rod raises the top plate, placing the corrugated cardboard box onto the sliding plate, where the clamping frame presses the cardboard down. Then, the telescopic rod lowers, and the blocking frame locks the sliding plate in place. Finally, the motor is activated, the friction blocks rub against the cardboard, and the dust removal component cleans away the debris and dust generated during friction. This solves the problem of excessive debris and dust generated during friction affecting the accuracy of test results and the lifespan of the testing device. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 is a cross-sectional front view of a corrugated cardboard box ink abrasion resistance testing instrument according to this utility model;

[0023] Figure 2 is a cross-sectional side view of a corrugated cardboard box ink abrasion resistance testing instrument of this utility model;

[0024] Figure 3 is a top view of the gear and toothed plate engagement of a corrugated cardboard box ink abrasion resistance testing instrument according to this utility model.

[0025] Figure 4 is a cross-sectional side view of the base and sliding plate of the corrugated cardboard box ink abrasion resistance testing instrument according to this utility model.

[0026] Figure 5 is a perspective view of the base of the instrument for testing the abrasion resistance of corrugated cardboard box ink according to this utility model;

[0027] Figure 6 is a perspective view of the top plate of the corrugated cardboard box ink abrasion resistance testing instrument of this utility model;

[0028] Figure 7 is a cross-sectional front view of a storage box for a corrugated cardboard box ink abrasion resistance testing instrument according to this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Base; 2. Telescopic rod; 3. Top plate; 4. Blocking frame; 5. Friction assembly; 501. Friction block; 502. Motor; 503. Reciprocating screw; 504. First bushing; 505. Rotating rod; 506. Second bushing; 6. Clamping assembly; 601. Clamping frame; 602. Sliding plate; 603. Telescopic cylinder; 7. Dust removal assembly; 701. Blower; 702. Exhaust fan; 8. First reciprocating thread; 9. 10. Second reciprocating thread; 11. Connecting frame; 12. Tooth plate; 13. First side tooth; 14. Second side tooth; 15. Gear; 16. Second through groove; 17. Connecting bracket; 18. Telescopic tube; 19. Storage box; 20. Storage bag; 21. Filter screen; 22. Sealing strip; 23. Sealing groove; 24. Groove; 25. Slider; 26. Slide; 27. Connecting rod; 28. Third through groove; 29. ​​First through groove. Detailed Implementation

[0031] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Referring to Figures 1 and 2, this utility model provides a technical solution: a corrugated cardboard box ink abrasion resistance testing instrument, comprising: a base 1, the top surface of the base 1 being connected to the bottom surface of a top plate 3 via a telescopic rod 2, a blocking frame 4 being provided on the bottom surface of the top plate 3, a friction assembly 5, the friction assembly 5 including a friction block 501 and a motor 502, the friction block 501 being connected to the rotating shaft of the motor 502, the motor 502 being disposed on the top plate 3, a clamping assembly 6, the clamping assembly 6 including a clamping frame 601 and a sliding plate 602, the clamping frame 601 being detachably fixed on the top surface of the sliding plate 602, the sliding plate 602 being disposed on the top surface of the base 1, the top surface of the sliding plate 602 being used to place the cardboard of the corrugated cardboard box, and a dust removal assembly 7, the dust removal assembly 7 being disposed on the blocking frame 4, the dust removal assembly 7 being used to clean debris and dust.

[0035] The telescopic rods 2 are multiple, preferably four, to make the lifting and lowering of the top plate 3 more stable. Friction paper is detachably mounted on the friction block 501; the type of friction paper can be selected as needed, and this application does not limit this selection. The blocking frame 4 is used to block debris and dust generated by the friction between the friction paper and the cardboard on the corrugated box. Two clamping frames 601 are provided, each fixed to the top surface of the sliding plate 602 by quick-release screws, for securing the cardboard on the corrugated box.

[0036] Specifically, first, the telescopic end of the control telescopic rod 2 extends, causing the top plate 3 to move upwards under force. The operator places the inked cardboard from the corrugated carton onto the sliding plate 602, tightens the quick-release screws, and locks the clamping frame 601 onto the sliding plate 602. Then, the telescopic end of the control telescopic rod 2 retracts, causing the top plate 3 to move downwards under force. Simultaneously, the blocking frame 4 moves downwards and covers the sliding plate 602. Finally, the motor 502 is started, and the friction block 501 rubs the cardboard. The dust removal component 7 cleans the debris and dust generated by the friction. By cleaning the large amount of debris and dust generated by the friction, the friction area is kept clean, improving the accuracy of the test results and protecting the testing device.

[0037] In some embodiments, the friction assembly 5 further includes a reciprocating screw 503 and a first bushing 504. The reciprocating screw 503 is connected to the rotating shaft of the motor 502, and the first bushing 504 is disposed on the reciprocating screw 503 and connected to the friction block 501. The first bushing 504 reciprocates linearly along the length of the reciprocating screw 503 as the reciprocating screw 503 rotates. This causes the friction block 501 to reciprocate linearly within the accommodating space enclosed by the blocking frame 4.

[0038] Furthermore, the friction assembly 5 also includes a rotating rod 505, which passes through the first through slot 26 on the top plate 3. One end of the rotating rod 505 is rotatably mounted on the bottom surface of the first bushing 504, and the other end of the rotating rod 505 is fixedly connected to the top surface of the friction block 501. The movement of the first bushing 504 causes the rotating rod 505 to move, thereby causing the friction block 501 to move.

[0039] Referring to Figures 3 and 6, in some embodiments, the friction assembly 5 further includes a second bushing 506. The reciprocating screw 503 is provided with a first reciprocating thread 8 and a second reciprocating thread 9. The first bushing 504 is provided on the first reciprocating thread 8, and the second bushing 506 is provided on the second reciprocating thread 9. The bottom of the second bushing 506 is connected to the connecting frame 10 through a connecting bracket 14. The connecting bracket 14 passes through the second through slot 13 on the top plate 3. A toothed plate 11 is provided inside the connecting frame 10. A gear 12 is provided on the rotating rod 505, and the gear 12 meshes with the toothed plate 11.

[0040] The first reciprocating thread 8 and the second reciprocating thread 9 are spaced apart to prevent collision between the first bushing 504 and the second bushing 506, which could damage the equipment. It should be noted that the reciprocating screw 503 and its matching bushings are technologies well-known to those skilled in the art; therefore, the specific structures of the reciprocating screw 503, the first bushing 504, and the second bushing 506 will not be described in detail here. Preferably, the length of the first reciprocating thread 8 is greater than that of the second reciprocating thread 9 to increase the working range of the friction block 501.

[0041] Specifically, the rotating shaft of motor 502 rotates, and the first bushing 504 reciprocates in the area of ​​the first reciprocating thread 8 on the reciprocating screw 503, driving the rotating rod 505 to move, thereby driving the friction block 501 to move. The second bushing 506 reciprocates in the area of ​​the second reciprocating thread 9 on the reciprocating screw 503, driving the connecting frame 14 to move, thereby driving the connecting frame 10 to move. The toothed plate 11 inside the connecting frame 10 drives the gear 12 on the rotating rod 505 to rotate, and the rotating rod 505 rotates synchronously, driving the friction block 501 to rotate. The friction block 501 rotates in linear reciprocating motion, which increases the diversity of the friction mode of the friction paper on the friction block 501, so that the result after friction is closer to the actual use situation, and further increases the stability and accuracy of the abrasion resistance side view of the ink paperboard.

[0042] In some embodiments, the toothed plate 11 includes a first side tooth 1101 and a second side tooth 1102. The first side tooth 1101 is disposed on the inner sidewall of the connecting frame 10 in the length direction and is located close to the sidewall of the connecting frame 10 in the width direction. The first side tooth 1101 and the second side tooth 1102 are centrally symmetrical about the geometric center point of the connecting frame 10.

[0043] As the first bushing 504 and the second bushing 506 move closer or further apart, the first side tooth 1101 and the second side tooth 1102 will respectively engage with the gear 12, causing the rotation direction of the gear 12 to change. Simultaneously, the rotation direction of the rotating rod 505 will also change, further enhancing the diversity of friction modes of the friction paper on the friction block 501.

[0044] Referring to Figures 4 and 5, in some embodiments, the clamping assembly 6 further includes a telescopic cylinder 603. The telescopic end of the telescopic cylinder 603 is connected to the sliding plate 602 via a connecting rod 24. The telescopic cylinder 603 is disposed on the bottom surface of the base 1, and the sliding plate 602 slides on the base 1. Furthermore, the base 1 is provided with a third through groove 25, through which the connecting rod 24 passes and connects to the telescopic end of the telescopic cylinder 603.

[0045] The bottom of the sliding plate 602 is provided with sliders 22, preferably in two sets of two. The top surface of the base 1 is provided with two grooves 23 corresponding to the two sets of sliders 22. The extension or retraction of the telescopic cylinder 603 causes the connecting rod 24 to slide within the third through groove 25, thereby causing the sliding plate 602 to slide on the top surface of the base 1. The sliders 22 and the grooves 23 make the sliding of the sliding plate 602 on the top surface of the base 1 more stable.

[0046] In some embodiments, the dust removal assembly 7 further includes a blower 701 and an exhaust fan 702. The blower 701 is disposed on the bottom surface of the top plate 3 and on the outer side wall of the baffle frame 4. The blower 701 is connected to the baffle frame 4 via a telescopic tube 15. The blower 701 draws in outside air and discharges it into the accommodating space within the baffle frame 4, dispersing debris and dust within it. The exhaust fan 702 draws in debris and dust along with the air in the accommodating space and discharges it, forming an air duct.

[0047] Referring to Figure 7, in some embodiments, a storage box 16 is provided below the exhaust fan 702, and a storage bag 17 and a filter screen 18 are provided inside the storage box 16. The storage bag 17 and the filter screen 18 are detachable, which increases the filtration capacity of the storage box 16 and makes cleaning the storage box 16 more convenient.

[0048] In some embodiments, a sealing strip 19 is provided at the position where the blocking frame 4 contacts the top surface of the base 1, and a groove 21 is provided on the top surface of the base 1 at the position corresponding to the sealing strip 19, and a sealing groove 20 is provided in the groove 21.

[0049] The combination of sealing strip 19 and sealing groove 20 increases the sealing between base 1 and blocking frame 4 when they come into contact, preventing debris and dust from splashing when friction block 501 rubs the cardboard.

[0050] Work process

[0051] First, the telescopic end of the control telescopic rod 2 extends, the top plate 3 moves upward under force, and the worker places the cardboard with ink on the corrugated cardboard box onto the sliding plate 602, tightens the quick-release screws, and locks the clamping frame 601 onto the sliding plate 602.

[0052] Then, the telescopic end of the control telescopic rod 2 retracts, the top plate 3 moves downward under force, the blocking frame 4 moves downward synchronously, and covers the sliding plate 602.

[0053] Next, the motor 502 and the telescopic cylinder 603 are started. The rotating shaft of the motor 502 rotates, driving the reciprocating screw 503 to rotate. The first bushing 504 moves in the area of ​​the first reciprocating thread 8, driving the rotating rod 505 to slide in the first through groove 26, thereby driving the friction block 501 with friction paper to rub on the paperboard with ink. The second bushing 506 moves in the area of ​​the second reciprocating thread 9, driving the connecting frame 14 to slide in the second through groove 13, thereby driving the connecting frame 10 to move. The first side tooth 1101 and the second side tooth 1102 are respectively hinged to the gear 12. The gear 12 rotates, driving the rotating rod 505 and the friction block 501 with friction paper to rotate.

[0054] Synchronously, the telescopic cylinder 603 extends and retracts periodically, causing the connecting rod 24 to slide within the third through groove 25, thereby causing the sliding plate 602 to slide on the top surface of the base 1, changing the contact position between the paperboard with ink and the friction block 501 with friction paper.

[0055] Finally, the blower 701 draws in outside air, discharges the air into the containment space inside the baffle frame 4, and blows away the debris and dust inside the baffle frame 4. The exhaust fan 702 draws in the debris and dust along with the air in the containment space and discharges them. After passing through the storage box 16, the debris in the air is filtered by the filter screen 18, the dust is collected by the storage bag 17, and the air is discharged from the through hole at the bottom of the storage box 16.

[0056] In the above embodiments, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "method," "specific method," or "some methods," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or method is included in at least one embodiment or method of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or method. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or methods. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or methods described in this specification, as well as the features of different embodiments or methods.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An instrument for testing the abrasion resistance of inks on corrugated cardboard boxes, characterized in that, include: The base, the top surface of which is connected to the bottom surface of the top plate via a telescopic rod, and the bottom surface of the top plate is provided with a blocking frame; A friction assembly, comprising a friction block and a motor, wherein the friction block is connected to the rotating shaft of the motor, and the motor is mounted on the top plate; a clamping assembly, comprising a clamping frame and a sliding plate, wherein the clamping frame is detachably fixed to the top surface of the sliding plate, and the sliding plate is mounted on the top surface of the base, the top surface of the sliding plate being used to place the cardboard of the corrugated carton; and a dust removal assembly, mounted on the blocking frame, for cleaning debris and dust.

2. The instrument for testing the abrasion resistance of corrugated cardboard box inks according to claim 1, characterized in that, The friction assembly further includes a reciprocating lead screw and a first bushing. The reciprocating lead screw is connected to the rotating shaft of the motor, and the first bushing is disposed on the reciprocating lead screw and connected to the friction block.

3. The instrument for testing the abrasion resistance of corrugated cardboard box inks according to claim 2, characterized in that, The friction assembly also includes a rotating rod that passes through a first through slot on the top plate. One end of the rotating rod is rotatably disposed on the bottom surface of the first bushing, and the other end of the rotating rod is fixedly connected to the top surface of the friction block.

4. The instrument for testing the abrasion resistance of corrugated cardboard box ink according to claim 3, characterized in that, The friction assembly further includes a second bushing. The reciprocating screw is provided with a first reciprocating thread and a second reciprocating thread. The first bushing is disposed on the first reciprocating thread, and the second bushing is disposed on the second reciprocating thread. The bottom of the second bushing is connected to the connecting frame through a connecting bracket. The connecting bracket passes through the second through slot on the top plate. A toothed plate is disposed inside the connecting frame. A gear is disposed on the rotating rod, and the gear meshes with the toothed plate.

5. The instrument for testing the abrasion resistance of corrugated cardboard box ink according to claim 4, characterized in that, The toothed plate includes a first side tooth and a second side tooth. The first side tooth is disposed on the inner side wall of the connecting frame in the length direction and is located close to the side wall of the connecting frame in the width direction. The first side tooth and the second side tooth are centrally symmetrical about the geometric center point of the connecting frame.

6. The instrument for testing the abrasion resistance of corrugated cardboard box ink according to claim 5, characterized in that, The clamping assembly also includes a telescopic cylinder, the telescopic end of which is connected to the sliding plate via a connecting rod. The telescopic cylinder is disposed on the bottom surface of the base, and the sliding plate slides on the base.

7. The instrument for testing the abrasion resistance of corrugated cardboard box inks according to claim 6, characterized in that, The base is provided with a third through groove, and the connecting rod passes through the third through groove to connect with the telescopic end of the telescopic cylinder.

8. The instrument for testing the abrasion resistance of corrugated cardboard box ink according to claim 7, characterized in that, The dust removal assembly also includes a blower and an exhaust fan. The blower is located on the bottom surface of the top plate and on the outer wall of the barrier frame. The blower is connected to the barrier frame via a telescopic tube.

9. The instrument for testing the abrasion resistance of corrugated cardboard box inks according to claim 8, characterized in that, A storage box is provided below the exhaust fan, and the storage box contains a storage bag and a filter.

10. The instrument for testing the abrasion resistance of corrugated cardboard box ink according to claim 9, characterized in that, A sealing strip is provided at the position where the blocking frame contacts the top surface of the base, and a groove is provided on the top surface of the base at the position corresponding to the sealing strip, and a sealing groove is provided in the groove.

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