Refractory brick grinding surface curvature detection device

Abstract

The utility model relates to a device for detecting the curvature of the ground surface of a refractory brick, and relates to the technical field of detection equipment, and in particular to a device for detecting the curvature of the ground surface of a refractory brick. The box body of the utility model is fixedly mounted on the upper part of the bottom plate by bolts; the front and rear ends of the box body are respectively fixedly mounted with a front cover and a rear cover by bolts; the rack shaft is respectively installed in the box body through the front cover, the spring, the spring retaining ring and the rear cover, and is locked and installed by a locking nut, and the rack shaft can move forward and backward inside the box body; the upper cover plate is fixedly mounted on the upper end of the box body by bolts; the gear transmission structure is installed on the upper cover plate, one end of which is meshed with the rack shaft, and the other end is connected to the extended shaft of the encoder fixedly mounted on the upper cover plate, so as to transmit the movement of the rack shaft to the encoder; the probe structure is installed on the front end of the rack shaft by bolts, and is used to connect with the surface of the refractory brick after grinding.

Description

Technical Field

[0001] The utility model discloses a device for detecting the curvature of a grinding surface of a refractory brick, and relates to the technical field of detection equipment, in particular to a device for detecting the curvature of a grinding surface of a refractory brick. Background Art

[0002] For refractory brick products with high dimensional tolerance requirements, special shapes, and strict assembly requirements, it is necessary to grind the surface to meet the dimensional tolerance requirements. The product after grinding will have dimensional requirements for the curvature of the processed surface, which requires measuring the processed surface after grinding to detect whether it meets the dimensional tolerance requirements. At present, a special laser plane measuring instrument is generally used for detection after grinding. Because the special laser plane measuring instrument has high requirements for the use environment, a special inspection room needs to be set up, which adds extra time for transportation. The product needs to be moved to a special inspection station and equipped with relevant inspection personnel. The procurement cost of the laser plane measuring instrument is high, which leads to increased production costs. At the same time, it is easy to bump during transportation, causing the corners of the refractory bricks to fall off, resulting in waste.

[0003] In view of the problems existing in the above-mentioned prior art, it is very necessary to study and design a new type of refractory brick grinding surface curvature detection device to overcome the problems existing in the prior art. Summary of the invention

[0004] According to the above-mentioned prior art, the dedicated laser measuring instrument is set in a dedicated testing room, and the product needs to be moved to the testing station for testing by professionals. In addition, the laser plane measuring instrument has high procurement costs, and the product is prone to bumping during transportation, resulting in the product falling off and becoming waste. Therefore, a refractory brick grinding surface curvature detection device is provided. The utility model mainly uses a mechanical detection device that can be transported to the production site to perform on-site testing of the product, thereby preventing the refractory brick from falling off and becoming waste due to bumping, and also reduces the procurement cost of the detection device.

[0005] The technical means adopted by the utility model are as follows:

[0006] A device for detecting the curvature of a grinding surface of a refractory brick comprises: a bottom plate, a rear end cover of a rack shaft, a spring retaining ring, a spring, a locking nut, a front end cover, a box body, a gear transmission structure and a probe structure;

[0007] Further, the box body is fixed to the upper part of the bottom plate by bolts;

[0008] Furthermore, the front and rear ends of the box body are respectively fixed with a front cover and a rear cover by bolts;

[0009] Furthermore, the rack shaft is respectively installed in the box body through the front cover, the spring, the spring retaining ring and the rear cover, and is locked and installed by the locking nut, and the rack shaft can move forward and backward inside the box body;

[0010] Furthermore, an upper cover plate is fixedly mounted on the upper end of the box body by bolts;

[0011] Further, a gear transmission structure is mounted on the upper cover plate, one end of which is meshed with the rack shaft, and the other end is connected to an extended shaft of an encoder fixedly mounted on the upper cover plate, so as to transmit the movement of the rack shaft to the encoder;

[0012] Furthermore, the probe structure is mounted on the front end of the rack shaft through bolts and is used to connect with the ground surface of the refractory brick.

[0013] Further, the gear transmission structure includes: an encoder pinion, a large gear, a gear shaft, a bearing seat, a bearing, a support sleeve, a locking nut and a dust cover;

[0014] Further, the bearing seat is fixed to the upper cover plate by bolts;

[0015] Furthermore, the gear shaft sleeve is installed inside the bearing seat after the bearing and the support sleeve are installed, the locking nut at the upper end is fastened and locked on the bearing seat, and the lower end is meshed with the rack shaft;

[0016] Further, the large gear is fixedly mounted on the gear shaft;

[0017] Further, the encoder pinion is fixedly mounted on the extended shaft of the encoder and meshes with the large gear;

[0018] Furthermore, a dust cover is mounted on the top of the bearing seat.

[0019] Furthermore, the probe structure includes: a probe frame, a probe wheel and a probe shaft

[0020] Further, the probe frame is mounted on the front end of the rack shaft by bolts;

[0021] Further, the probe wheel is mounted on the probe shaft and is mounted on the front end of the probe frame through the probe shaft;

[0022] Furthermore, the wheel side wall of the probe wheel protrudes out of the front end edge of the side head frame, so as to be in stable contact with the ground surface of the refractory brick.

[0023] Furthermore, a box adjustment block is fixedly mounted on the upper end surface of the bottom plate;

[0024] Furthermore, a box adjusting screw is screwed onto the box adjusting block through a threaded hole;

[0025] Furthermore, the front end of the box adjusting screw contacts the rear side wall of the box, and the front and rear position of the box is adjusted by rotating and twisting the box adjusting screw forward / backward.

[0026] Furthermore, a lateral adjustment block is fixedly mounted on the side wall of the box;

[0027] Furthermore, a lateral adjustment screw is screwed onto the lateral adjustment block through a threaded hole;

[0028] Furthermore, the front end of the lateral adjustment screw is in conflict with the side end surface of the upper cover plate, and the lateral position of the upper cover plate is adjusted by rotating and twisting the lateral adjustment screw forward / backward.

[0029] Furthermore, a bearing seat adjustment block is mounted on the upper end surface of the upper cover plate;

[0030] Furthermore, a bearing seat adjusting screw is screwed onto the bearing seat adjusting block through a threaded hole;

[0031] Furthermore, the front end of the bearing seat adjustment screw contacts the front side wall of the bearing seat, and the front and rear position of the bearing seat is adjusted by rotating and twisting the bearing seat adjustment screw forward / backward.

[0032] Furthermore, a threaded hole is provided on the side wall of the box body, and a side tightening rod is mounted on the threaded hole;

[0033] Further, the center line of the side tension rod and the center line of the rack shaft are kept in a horizontal state;

[0034] Furthermore, the top end of the side clamping rod is in vertical contact with the rack shaft, and the rack shaft is angularly positioned by rotating and twisting the side clamping rod forward / backward.

[0035] Furthermore, sealing rings are installed in the grooves on the sides of the front cover and the rear cover opposite to the box body, which play a dust-proof sealing role for the inside of the device.

[0036] The working principle of the utility model is:

[0037] The spring 7 relies on the elastic force and the adjustment of the locking nut 15 at the rear of the rack shaft 4 to ensure that the outer cylindrical surface of the probe wheel 23 is in stable contact with the surface of the refractory brick after grinding. When the refractory brick moves, the probe wheel 23 will move forward and backward accordingly following the bending of the surface after grinding. Since the probe wheel 23 is connected to the rack shaft 4, it drives the rack shaft 4 to move forward and backward. The rack part of the rack shaft 4 is meshed with the gear at the front end of the gear shaft 11 to transform the forward and backward movement of the rack shaft 4 into the rotation of the gear shaft 11. Since the large gear 10 is connected to the gear shaft 11, the large gear 10 can rotate accordingly with the forward and backward movement of the rack shaft 4; the large gear 10 is meshed with the encoder pinion 8, and the encoder pinion 8 is fixed to the extended shaft end of the encoder 9, so the encoder 9 extends and rotates; the encoder 9 will send a corresponding pulse signal and transmit the signal to the PLC of the brick grinding machine, and judge whether the curvature of the ground surface of the refractory brick meets the tolerance requirement according to the pulse signal.

[0038] The working process of the utility model is:

[0039] Before use, adjust the bearing seat adjustment screw and the lateral adjustment screw to eliminate the clearance between the rack shaft and the gear shaft, the encoder pinion and the large gear, and ensure transmission accuracy. The bottom plate can be fixed on the fixed bed at the brick outlet of the brick grinder. The encoder is connected to the PLC of the brick grinder with a cable to transmit pulse signals to the PLC; according to the dimensional tolerance requirements of the product to be measured, adjust the box adjustment screw on the device and the locking nut at the rear of the rack shaft to ensure that the outer cylindrical surface of the probe wheel contacts the ground surface of the refractory brick when the brick grinder moves to the brick outlet with the ground refractory brick. When the brick grinder has finished grinding the surface of the refractory brick, the slide of the brick grinder will move the ground refractory brick to the brick outlet, and the outer cylindrical surface of the probe wheel will be in stable contact with the ground surface of the refractory brick. When the refractory brick moves, the probe wheel will move back and forth accordingly following the bending of the ground surface. Since the probe wheel is connected to the rack shaft, it drives the rack shaft to move back and forth. The rack part of the rack shaft meshes with the gear at the front end of the gear shaft to transform the forward and backward movement of the rack shaft into the rotation of the gear shaft. Since the large gear is connected to the gear shaft, the large gear can rotate accordingly with the forward and backward movement of the rack shaft; the large gear meshes with the encoder pinion gear, and the encoder pinion is fixed to the encoder extended shaft end, so the encoder extended shaft rotates; the encoder will send out a corresponding pulse signal and transmit the signal to the PLC of the brick grinder. According to the pulse signal, it is judged whether the curvature of the ground surface of the refractory brick meets the tolerance requirements. When the tolerance requirement is met, the material can be unloaded. If the requirement is not met, the grinding machine slide can move the refractory bricks back to the grinding station to continue grinding until the curvature of the ground surface of the refractory bricks meets the tolerance requirement.

[0040] Compared with the prior art, the utility model has the following advantages:

[0041] 1. The device for detecting the curvature of the grinding surface of refractory bricks provided by the utility model has a simple structure, high precision, and is provided with a sealing structure, which can adapt to a relatively harsh working environment. Compared with the laser plane measuring instrument, the manufacturing and use costs are low;

[0042] 2. The device for detecting the curvature of the grinding surface of refractory bricks provided by the utility model has a small size and can be flexibly arranged at the brick outlet of the brick grinder. It cooperates with the brick grinder to directly measure the curvature of the grinding surface after grinding, thereby reducing the transportation time, improving production efficiency, avoiding bumps and scratches, and reducing the scrap rate. At the same time, there is no need to equip special inspection personnel, saving human resources.

[0043] In summary, the technical solution of the utility model solves the problems in the prior art that the dedicated laser measuring instrument is set in a dedicated inspection room, the product needs to be moved to the inspection station for inspection by professionals, the laser plane measuring instrument has high procurement costs, and the product is prone to bumps during transportation, resulting in the product falling off and becoming waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the utility model 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, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0045] Figure 1 It is a schematic diagram of the structure of the utility model;

[0046] Figure 2 for Figure 1 AA view;

[0047] Figure 3 It is a top view of the utility model.

[0048] In the figure: 1, base plate 2, box adjustment block 3, box adjustment screw 4, rack shaft 5, rear end cover 6, spring retaining ring 7, spring 8, encoder pinion 9, encoder 10, large gear 11, gear shaft 12, bearing seat 13, bearing 14, support sleeve 15, locking nut 16, dust cover 17, bearing seat adjustment block 18, bearing seat adjustment screw 19, upper cover 20, front end cover 21, sealing ring 22, probe frame 23, probe wheel 24, probe shaft 25, side tightening rod 26, lateral adjustment block 27, lateral adjustment screw 28, box. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the utility model. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0053] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present utility model: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0056] like Figure 1As shown, the utility model provides a device for detecting the curvature of the grinding surface of a refractory brick, comprising: a bottom plate 1, a rear end cover 5 of a rack shaft 4, a spring retainer 6, a spring 7, a locking nut 15, a front end cover 20, a box body 28, a gear transmission structure and a probe structure; the box body 28 is fixedly mounted on the upper part of the bottom plate 1 by bolts; the front end cover 20 and the rear end cover 5 are fixedly mounted on the front and rear ends of the box body 28 by bolts; the rack shaft 4 passes through the front end cover 20, the spring 7, the spring retainer 6 and the rear end cover 5 respectively. The rack shaft 4 is in the box body 28 and is locked and installed by the locking nut 15. The rack shaft 4 can move back and forth inside the box body 28. The upper end of the box body 28 is fixed with an upper cover plate 19 by bolts. The gear transmission structure is installed on the upper cover plate 19, one end of which is meshed with the rack shaft 4, and the other end is connected to the extended shaft of the encoder 9 fixed on the upper cover plate 19, so as to transmit the movement of the rack shaft 4 to the encoder 9. The probe structure is installed on the front end of the rack shaft 4 by bolts, and is used to connect with the surface of the refractory brick after grinding.

[0057] like Figure 1 As shown, the gear transmission structure includes: an encoder pinion 8, a large gear 10, a gear shaft 11, a bearing seat 12, a bearing 13, a support sleeve 14, a locking nut 15 and a dust cover 16; the bearing seat 12 is fixed to the upper cover plate 19 by bolts; the gear shaft 11 is installed inside the bearing seat 12 after being fitted with the bearing 13 and the support sleeve 14, and the locking nut 15 at its upper end is fastened and locked on the bearing seat 12, and the lower end is meshed with the rack shaft 4; the large gear 10 is fixedly mounted on the gear shaft 11; the encoder pinion 8 is fixedly mounted on the protruding shaft of the encoder 9 and meshed with the large gear 10; the top of the bearing seat 12 is equipped with a dust cover 16.

[0058] like Figure 1 As shown, the probe structure includes: a probe frame 22, a probe wheel 23 and a probe shaft 24; the probe frame 22 is mounted on the front end of the rack shaft 4 by bolts; the probe wheel 23 is sleeved on the probe shaft 24 and is mounted on the front end of the probe frame 22 through the probe shaft 24; the wheel side wall of the probe wheel 23 protrudes from the front end edge of the side head frame 22, which is used for stable contact with the surface of the refractory brick after grinding.

[0059] like Figure 1 As shown, a box adjustment block 2 is fixedly mounted on the upper end surface of the bottom plate 1; a box adjustment screw 3 is screwed onto the box adjustment block 2 through a threaded hole; the front end of the box adjustment screw 3 is in contact with the rear side wall of the box 28, and the front and rear positions of the box 28 are adjusted by rotating and twisting the box adjustment screw 3 forward / backward.

[0060] like Figure 2As shown, a lateral adjustment block 26 is fixedly mounted on the side wall of the box body 28; a lateral adjustment screw 27 is screwed onto the lateral adjustment block 26 through a threaded hole; the front end of the lateral adjustment screw 27 abuts against the side end surface of the upper cover 19, and the lateral position of the upper cover 19 is adjusted by rotating and twisting the lateral adjustment screw 27 forward / backward.

[0061] like Figure 1 As shown, a bearing seat adjustment block 17 is assembled on the upper end surface of the upper cover plate 19; a bearing seat adjustment screw 18 is screwed onto the bearing seat adjustment block 17 through a threaded hole; the front end of the bearing seat adjustment screw 18 is in conflict with the front side wall of the bearing seat 12, and the front and rear position of the bearing seat 12 is adjusted by rotating and twisting the bearing seat adjustment screw 18 forward / backward.

[0062] like Figure 2 As shown, a threaded hole is opened on the side wall of the box body 28, and a side clamping rod 25 is installed on the threaded hole; the center line of the side clamping rod 25 is kept in a horizontal state with the center line of the rack shaft 4; the top end of the side clamping rod 25 is vertically in contact with the rack shaft 4, and the rack shaft 4 is angularly positioned by rotating and twisting the side clamping rod 25 forward / backward.

[0063] like Figure 1 As shown, sealing rings 21 are installed in the grooves on the sides of the front cover 20 and the rear cover 5 opposite to the box body 28 to provide dustproof sealing for the interior of the device.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field 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 with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A device for detecting curvature of a grinding surface of a refractory brick, characterized in that: The device for detecting the curvature of the ground surface of a refractory brick comprises: a base plate (1), a rack shaft (4), a rear end cover (5), a spring retaining ring (6), a spring (7), a locking nut (15), a front end cover (20), a housing (28), a gear transmission structure and a probe structure; The box body (28) is fixed to the upper part of the bottom plate (1) by means of bolts; The front and rear ends of the box body (28) are respectively fixed with a front cover (20) and a rear cover (5) by bolts; The rack shaft (4) passes through the front cover (20), the spring (7), the spring retaining ring (6) and the rear cover (5) and is installed in the box body (28). The rack shaft (4) is locked and installed by a locking nut (15). The rack shaft (4) can move forward and backward inside the box body (28); The upper end of the box body (28) is fixed with an upper cover plate (19) by means of bolts; The gear transmission structure is mounted on the upper cover plate (19), one end of which is meshed with the rack shaft (4), and the other end of which is connected to the extended shaft of the encoder (9) fixedly mounted on the upper cover plate (19), so as to transmit the movement of the rack shaft (4) to the encoder (9); The probe structure is mounted on the front end of the rack shaft (4) by means of bolts and is used to contact the ground surface of the refractory brick.

2. The device for detecting curvature of a grinding surface of a refractory brick according to claim 1, characterized in that: The gear transmission structure comprises: an encoder pinion (8), a large gear (10), a gear shaft (11), a bearing seat (12), a bearing (13), a support sleeve (14), a locking nut (15) and a dust cover (16); The bearing seat (12) is fixed to the upper cover plate (19) by means of bolts; The gear shaft (11) is mounted on a bearing (13) and a support sleeve (14) and then installed inside the bearing seat (12). The locking nut (15) at the upper end is fastened and locked on the bearing seat (12), and the lower end is meshed with the rack shaft (4). The large gear (10) is fixedly mounted on the gear shaft (11); The encoder pinion (8) is fixedly mounted on the protruding shaft of the encoder (9) and meshes with the large gear (10); The top of the bearing seat (12) is equipped with a dust cover (16).

3. The device for detecting curvature of a grinding surface of a refractory brick according to claim 1, characterized in that: The probe structure comprises: a probe frame (22), a probe wheel (23) and a probe shaft (24). The probe frame (22) is mounted on the front end of the rack shaft (4) by means of bolts; The probe wheel (23) is sleeved on the probe shaft (24) and is mounted on the front end of the probe frame (22) through the probe shaft (24); The wheel side wall of the measuring head wheel (23) protrudes from the front end edge of the side head frame (22) and is used to stably contact the surface of the refractory brick after grinding.

4. The device for detecting curvature of a grinding surface of a refractory brick according to claim 1, characterized in that: A box adjustment block (2) is fixedly mounted on the upper end surface of the bottom plate (1); The box adjustment block (2) is screwed with a box adjustment screw (3) through a threaded hole; The front end of the box adjustment screw (3) contacts the rear side wall of the box (28), and the front and rear position of the box (28) is adjusted by rotating and twisting the box adjustment screw (3) to move forward / backward.

5. The device for detecting curvature of a grinding surface of a refractory brick according to claim 1, characterized in that: A lateral adjustment block (26) is fixedly mounted on the side wall of the box body (28); The lateral adjustment block (26) is screwed with a lateral adjustment screw (27) through a threaded hole; The front end of the lateral adjustment screw (27) contacts the side end surface of the upper cover plate (19), and the lateral position of the upper cover plate (19) is adjusted by rotating and twisting the lateral adjustment screw (27) to move forward / backward.

6. The device for detecting curvature of a grinding surface of a refractory brick according to claim 1, characterized in that: A bearing seat adjustment block (17) is mounted on the upper end surface of the upper cover plate (19); The bearing seat adjustment block (17) is screwed with a bearing seat adjustment screw (18) through a threaded hole; The front end of the bearing seat adjustment screw (18) contacts the front side wall of the bearing seat (12), and the front and rear positions of the bearing seat (12) are adjusted by rotating and twisting the bearing seat adjustment screw (18) forward / backward.

7. The device for detecting curvature of a grinding surface of a refractory brick according to claim 1, characterized in that: A threaded hole is provided on the side wall of the box body (28), and a side tightening rod (25) is mounted on the threaded hole; The center line of the side tightening rod (25) and the center line of the rack shaft (4) are kept in a horizontal state; The top end of the side tightening rod (25) is in vertical contact with the rack shaft (4), and the rack shaft (4) is angularly positioned by rotating and twisting the side tightening rod (25) to move forward / backward.

8. The device for detecting curvature of a grinding surface of a refractory brick according to claim 1, characterized in that: The grooves of the front cover (20) and the rear cover (5) on the sides opposite to the box body (28) are equipped with sealing rings (21), which play a role in dustproof sealing for the inside of the device.

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