A calligraphy copying practice auxiliary device

Abstract

The utility model discloses a calligraphy imitating practice auxiliary device belongs to calligraphy practice device field, including base, and base front end is provided with operation cavity, and the operation cavity is slidably installed with the matching electronic display component, and the base upper end is provided with the display window that is linked together with operation cavity, and the base upper end still fixedly installed with the pair of symmetrical distribution's guide rail no.

Description

Technical Field

[0001] This utility model relates to the field of calligraphy practice devices, and more specifically, to an auxiliary device for calligraphy copying practice. Background Technology

[0002] Calligraphy, as a traditional art treasure of the Chinese nation, is not only an important carrier of cultural inheritance but also an effective way to cultivate personal focus and aesthetic ability. In the process of learning calligraphy, copying is the core method for mastering brushstrokes and structure. Through repeated imitation of classic works, learners can gradually grasp the essence of calligraphy. However, traditional calligraphy copying practice methods have many limitations and are difficult to meet the needs of modern learners.

[0003] Traditional calligraphy copying mainly relies on paper copybooks and Xuan paper. Learners need to place the Xuan paper over the copybook for tracing or copy the characters on the Xuan paper while referring to the copybook. This method has obvious shortcomings: First, paper copybooks are difficult to preserve, and long-term handling can easily lead to paper wear and blurring of the characters, affecting the copying effect; second, when tracing over Xuan paper, it is difficult to ensure the fit between the copybook and the Xuan paper, which can easily cause shifting and lead to deviations in stroke copying; third, when copying, learners need to frequently switch their gaze between the copybook and the Xuan paper, which can easily distract them and make it difficult to accurately grasp the proportional relationships of the character structure.

[0004] With the development of electronic technology, some electronic tracing devices have emerged, but existing devices still have design flaws. Some devices separate the display screen from the writing board, requiring learners to frequently shift their gaze between the two, which also leads to a problem of distraction. Other devices, while using a transparent writing board to cover the display screen, lack a precise positioning structure, making it easy for the writing board to misalign with the screen display area when moved, affecting the accuracy of tracing. In addition, the writing board of existing devices mostly relies on manual wiping for cleaning, which is incomplete and easily scratches the surface, reducing its reusability. At the same time, the lack of a user-friendly support structure can easily lead to arm fatigue during prolonged writing, affecting the practice experience.

[0005] For beginners, accurately aligning the model text with the writing area and easily comparing the results of their imitations are key to improving learning efficiency. For advanced learners, it is necessary to frequently change to different fonts and styles of models for comparative practice. Traditional methods and existing devices cannot simultaneously meet these needs, resulting in a high barrier to entry for calligraphy learning and slow progress.

[0006] Therefore, a calligraphy copying practice aid device is proposed to address the above problems. Utility Model Content

[0007] 1. Technical problems to be solved

[0008] In view of the problems existing in the prior art, the purpose of this utility model is to provide a calligraphy copying practice auxiliary device, which can enable users to copy calligraphy through electronic display and provide multiple copying methods to improve the quality of copying.

[0009] 2. Technical Solution

[0010] To solve the above problems, the present invention adopts the following technical solution.

[0011] A calligraphy copying practice aid includes a base, an operating cavity at the front end of the base, a matching electronic display component slidably mounted in the operating cavity, a display window communicating with the operating cavity at the upper end of the base, a pair of symmetrically distributed guide rails II fixedly mounted at the upper end of the base, matching guide shoes II slidably mounted on the guide rails II, and a copying component fixedly mounted between the pair of guide shoes II.

[0012] Furthermore, the electronic display component includes a mounting base, an outer protective plate fixedly mounted on the front end of the mounting base, a mounting groove opened at the upper end of the mounting base, a matching electronic display screen mounted in the mounting groove, and guide rails fixedly mounted on both the left and right sides of the operating cavity. Matching guide shoes are slidably mounted on the guide rails and are fixedly connected to the mounting base. The outer protective plate can be moved by the mounting base, facilitating the installation and operation of the electronic display screen. The guide rails and guide shoes are used to improve the movement accuracy of the mounting base and ensure that the electronic display screen can be precisely aligned with the display window.

[0013] Furthermore, a magnetic handle is fixedly installed on the outer end of the outer protective plate, and a magnetic block corresponding to the magnetic handle is embedded in the front end of the base. The magnetic attraction between the magnetic handle and the magnetic block can achieve the overall installation and positioning of the electronic display component.

[0014] Furthermore, the copying component includes a movable plate on which multiple linearly distributed transparent copying boards are embedded. These transparent copying boards are matched with the electronic display screen. A synchronization plate is fixedly installed between the movable plate and the guide shoe. The calligraphy displayed on the electronic display screen below can be viewed through the multiple transparent copying boards. Then, precise copying practice can be performed directly on the transparent copying boards. The position of the transparent copying boards can be moved to achieve both copying different calligraphic styles and comparing the copying of the same calligraphic style.

[0015] Furthermore, the upper end of the movable plate is provided with multiple sets of T-shaped grooves symmetrically distributed about the transparent tracing plate. Matching T-shaped sliders are slidably installed in the T-shaped grooves, and a wiping strip is fixedly installed between a pair of T-shaped sliders. By sliding the wiping strip, the writing on the surface of the transparent tracing plate can be wiped, thereby achieving reuse.

[0016] Furthermore, the wiping strip includes a fixing plate, and a sponge strip is detachably installed on the lower end of the fixing plate through an adhesive layer. The sponge strip is used to wipe the writing to ensure the cleanliness of the transparent tracing board surface, and can be easily replaced when the cleaning function deteriorates.

[0017] Furthermore, the synchronization plate includes a plate body, the lower end of which has a telescopic groove. A retaining ball is movably installed at the opening of the telescopic groove. A compression spring is fixedly installed between the retaining ball and the top wall of the telescopic groove. The upper surface of the base has two sets of hemispherical slots, the same number as the synchronization plate, and the hemispherical slots match the retaining balls. The cooperation between the retaining balls and the hemispherical slots can accurately position the transparent tracing plate, aligning it with the electronic display screen to ensure the tracing effect. At the same time, when adjusting the position of the moving plate, external force is applied to compress the spring, allowing the retaining ball to enter the telescopic groove for avoidance.

[0018] Furthermore, extension plates are fixedly installed on both the left and right ends of the base, and silicone pads are fixedly installed on the upper end of the extension plates. The extension plates can raise the arm height, making it convenient for users to practice calligraphy in a comfortable posture, and the silicone pads provide flexible protection.

[0019] 3. Beneficial effects

[0020] Compared with existing technologies, the advantages of this utility model are:

[0021] (1) This solution significantly improves the accuracy and convenience of copying through precise positioning structure and display design. In traditional copying, the calligraphy template and writing area are easily misaligned, affecting the learning effect. However, this device ensures precise alignment between the electronic display screen and the display window through the cooperation of guide rail one and guide shoe one; the locking ball of the synchronization plate and the hemispherical slot of the base cooperate to make the transparent copying board accurately correspond to the calligraphy model on the screen, avoiding stroke copying errors caused by positional deviation. At the same time, the electronic display screen can display high-definition calligraphy works, supports zoom and rotation operations, making it convenient for learners to observe details. The design of multiple transparent copying boards also allows for comparison of different copying versions, significantly improving the pertinence and efficiency of practice.

[0022] (2) The rapid cleaning and reuse of the writing area in this solution reduces practice costs while maintaining ease of operation. Traditional paper tracing consumes a large amount of Xuan paper and is difficult to reuse. Existing electronic devices also have many inconveniences in their cleaning methods. In contrast, the transparent tracing board of this device uses tempered glass with a stain-resistant coating and a sliding wiping strip. Simply push the T-shaped slider to quickly wipe away ink stains. The cleaning is thorough and the operation is simple. The sponge strip is attached with Velcro and can be easily replaced after wear, ensuring a long-term cleaning effect. This significantly reduces paper consumption, conforms to the concept of environmental protection, and avoids the trouble of frequently changing writing media. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the disassembled structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the electronic display component of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the wiping strip of this utility model;

[0027] Figure 5 This is a cross-sectional view of the synchronization plate of this utility model.

[0028] Explanation of the labels in the diagram:

[0029] 1. Base; 2. Electronic display assembly; 21. Mounting base; 22. Outer protective plate; 23. Electronic display screen; 24. Guide rail one; 25. Guide shoe one; 26. Magnetic handle; 3. Magnetic block; 4. Tracing assembly; 41. Moving plate; 42. Transparent tracing plate; 43. Synchronization plate; 431. Plate body; 432. Clamping ball; 433. Compression spring; 44. T-shaped slide; 45. Wiping strip; 451. Fixing plate; 452. Adhesive layer; 453. Sponge strip; 46. T-shaped slider; 5. Guide rail two; 6. Guide shoe two; 7. Hemispherical slot; 8. Extension plate; 9. Silicone pad; 10. Display window. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Example 1:

[0034] Please see Figure 1 - Figure 4 A calligraphy copying practice auxiliary device includes a base 1, an operating cavity at the front end of the base 1, a matching electronic display component 2 slidably installed in the operating cavity, a display window 10 connected to the operating cavity at the upper end of the base 1, a pair of symmetrically distributed guide rails 5 fixedly installed at the upper end of the base 1, matching guide shoes 6 slidably installed on the guide rails 5, and a copying component 4 fixedly installed between the pair of guide shoes 6.

[0035] The base 1, serving as the overall support structure, is made of high-density fiberboard through precision cutting. This material is hard and stable, effectively supporting the weight of the electronic display component 2 and the copy component 4. Its surface is coated with environmentally friendly varnish, forming a smooth and wear-resistant protective layer that prevents scratches during daily use and facilitates cleaning. The operating cavity at the front of the base 1 is precisely matched to the size of the electronic display component 2, providing it with stable sliding space.

[0036] The electronic display assembly 2 includes a mounting base 21, with an outer protective plate 22 fixedly mounted on the front end of the mounting base 21. A mounting groove is provided on the upper end of the mounting base 21, and a matching electronic display screen 23 is installed in the mounting groove. Guide rails 24 are fixedly mounted on both sides of the operating cavity, and matching guide shoes 25 are slidably mounted on the guide rails 24. The guide shoes 25 are fixedly connected to the mounting base 21. The outer protective plate 22 can be moved by the mounting base 21, which facilitates the installation and operation of the electronic display screen 23. The guide rails 24 and guide shoes 25 are used to improve the movement accuracy of the mounting base 21 and ensure that the electronic display screen 23 can be accurately aligned with the display window 10.

[0037] A magnetic handle 26 is fixedly installed on the outer end of the outer protective plate 22, and a magnetic block 3 corresponding to the magnetic handle 26 is embedded in the front end of the base 1. The magnetic attraction between the magnetic handle 26 and the magnetic block 3 can realize the overall installation and positioning of the electronic display component 2.

[0038] The mounting base 21 is injection molded from ABS engineering plastic, featuring lightweight and high strength. It stably supports the electronic display screen 23 while reducing inertial resistance during sliding. The outer protective plate 22 is made of transparent acrylic sheet, 3mm thick, providing excellent impact resistance and protecting the electronic display screen 23 within the mounting base 21 from external impact damage without interfering with user operation. The inner wall of the mounting groove at the upper end of the mounting base 21 is lined with cushioning foam to reduce vibration during movement and prevent screen damage. The electronic display screen 23 uses a 10.1-inch high-definition IPS touchscreen with a resolution of 1920×1080, offering high color fidelity and accurately displaying the ink density and line thickness of calligraphy works. The touchscreen design allows users to easily switch between works or adjust the display ratio through clicks and swipes.

[0039] It should be noted that the electronic display screen 23 has a built-in embedded processor and 16GB of storage space, capable of storing thousands of calligraphy works, including various fonts such as regular script, running script, and cursive script. The processor connects to the screen via a touch chip, allowing users to switch, zoom, and rotate works via touch operation. For power supply, the device uses a dual-mode power supply of lithium battery and external power. The electronic display component 2 has a battery compartment on the back, housing a 3000mAh lithium-ion battery that supports 5V / 2A fast charging, providing up to 6 hours of continuous use on a full charge, meeting the needs of outdoor practice. Additionally, the device is equipped with a DC power interface, allowing direct power supply via an external power adapter, suitable for long-term indoor use.

[0040] The copying component 4 includes a movable plate 41, on which multiple linearly distributed transparent copying plates 42 are embedded and installed. The transparent copying plates 42 are matched with the electronic display screen 23. A synchronization plate 43 is fixedly installed between the movable plate 41 and the guide shoe 6. The calligraphy displayed on the electronic display screen 23 below can be viewed through the multiple transparent copying plates 42. Then, precise copying practice can be performed directly on the transparent copying plates 42. The position of the transparent copying plates 42 can be moved to realize the copying of different calligraphy and can also be used for copying and comparing the same calligraphy.

[0041] The movable board 41 is made of aluminum alloy, making it easy for users to move while providing stable support for the transparent tracing board 42. The transparent tracing board 42 is made of ultra-clear tempered glass with a light transmittance of over 92%. The glass surface undergoes a special anti-glare treatment to reduce ambient light reflection, ensuring users can clearly see the calligraphy model on the electronic display screen 23 below. Simultaneously, the glass surface is covered with a nano-anti-fouling coating, making ink stains easy to wipe away after writing and resistant to scratches over long-term use. Multiple transparent tracing boards 42 are linearly distributed, meeting users' needs for simultaneously comparing different fonts or different ways of writing the same font, enhancing the targeted nature of tracing practice.

[0042] The upper end of the movable plate 41 is also provided with multiple sets of T-shaped grooves 44 symmetrically distributed with respect to the transparent tracing plate 42. Matching T-shaped sliders 46 are slidably installed in the T-shaped grooves 44. A wiping strip 45 is fixedly installed between a pair of T-shaped sliders 46. Through the sliding operation of the wiping strip 45, the writing on the surface of the transparent tracing plate 42 can be wiped, thereby realizing reuse.

[0043] The wiping strip 45 includes a fixing plate 451. A sponge strip 453 is detachably installed on the lower end of the fixing plate 451 via an adhesive layer 452. The sponge strip 453 is used to wipe the writing to ensure the cleanliness of the surface of the transparent tracing board 42. It can be easily replaced when the cleaning function deteriorates.

[0044] The inner wall of the T-shaped groove 44 is precision polished to ensure smooth sliding of the T-shaped slider 46. The T-shaped slider 46 is made of ABS engineering plastic and is integrally molded with the fixing plate 451 of the wiping strip 45. The fixing plate 451 is made of rigid plastic to ensure the stability of the force applied during wiping. The adhesive layer 452 adopts a Velcro design, with the hook side fixed to the lower end of the fixing plate 451 and the rough side sewn to the upper end of the sponge strip 453, which facilitates the removal and replacement of the sponge strip 453. The sponge strip 453 is made of high-density hydrophilic sponge, which is soft and has good water absorption. It can thoroughly wipe the ink stains on the surface of the transparent tracing board 42 without scratching the glass surface, ensuring clarity when reused.

[0045] The base 1 has extension plates 8 fixedly installed on both the left and right ends. A silicone pad 9 is fixedly installed on the upper end of the extension plate 8. The extension plate 8 can raise the arm height, making it convenient for users to practice calligraphy in a comfortable posture. The silicone pad 9 provides flexible protection.

[0046] The extension tray 8 is made of solid wood with a smooth surface and is coated with environmentally friendly wood wax oil. It has a warm texture and is resistant to sweat stains. The height of the extension tray 8 is flush with the upper surface of the movable board 41, which can support the user's forearm and avoid arm fatigue caused by writing in the air. The silicone pad 9 fixed at the upper end of the extension tray 8 is made of food-grade silicone with a thickness of 5mm. It is soft and non-slip, which can increase the comfort of the arm in contact with the tray and prevent the arm from sliding during writing, thus affecting the stability of copying.

[0047] Example 2:

[0048] Please see Figure 5The synchronization plate 43 includes a plate body 431. A telescopic groove is provided at the lower end of the plate body 431. A retaining ball 432 is movably installed at the opening of the telescopic groove. A compression spring 433 is fixedly installed between the retaining ball 432 and the top wall of the telescopic groove. Two sets of hemispherical slots 7, the same number as the synchronization plate 43, are provided on the upper surface of the base 1. The hemispherical slots 7 match the retaining balls 432. The cooperation between the retaining balls 432 and the hemispherical slots 7 can accurately position the transparent tracing plate 42 so that it can be aligned with the electronic display screen 23 to ensure the tracing effect. At the same time, when adjusting the position of the moving plate 41, external force is applied to squeeze the compression spring 433 so that the retaining ball 432 can enter the telescopic groove for avoidance.

[0049] The body 431 of the synchronization plate 43 is made of aluminum alloy, the same material as the moving plate 41, which avoids structural deformation caused by different coefficients of thermal expansion and contraction. The retaining ball 432 in the telescopic groove is made of wear-resistant nylon with a smooth surface, and the compression spring 433 is made of stainless steel with precisely calculated elasticity. It can push the retaining ball 432 to fit tightly into the hemispherical slot 7 to achieve the positioning of the moving plate 41, and when the user pushes the moving plate 41, the retaining ball 432 can be retracted into the telescopic groove by external force, ensuring smooth adjustment. The hemispherical slots 7 on the upper surface of the base 1 are arranged in a linear array, and the spacing between adjacent slots is the same as the width of the transparent tracing plate 42, ensuring that each transparent tracing plate 42 can be accurately aligned with the display area of ​​the electronic display screen 23, improving the accuracy of tracing.

[0050] Working principle:

[0051] In use, the user first uses the magnetic handle 26 on the outer protective plate 22 to overcome the attraction of the magnetic block 3 and pull the electronic display component 2 out of the operating cavity of the base 1. At this time, the mounting base 21 slides smoothly with the cooperation of the guide shoe 25 and the guide rail 24, revealing the electronic display screen 23 in the mounting slot. The user touches the electronic display screen 23 to select the model to be copied from the built-in calligraphy work library, adjusts the work to a suitable display size and angle, and then pushes the electronic display component 2 back into the operating cavity until the magnetic handle 26 and the magnetic block 3 are attracted and fixed. At this time, the electronic display screen 23 is precisely aligned with the display window 10 at the top of the base 1, and the calligraphy work on the screen can be clearly presented through the display window.

[0052] Next, the user adjusts the position of the tracing component 4 according to their practice needs. When the moving plate 41 is pushed, the guide shoe 6 slides along the guide rail 5, and the synchronization plate 43 moves with the moving plate 41. The retaining ball 432 at the lower end of the synchronization plate 43 contacts the upper surface of the base 1 under the elastic force of the compression spring 433. When it moves to the preset position, the retaining ball 432 engages with the corresponding hemispherical slot 7, making a slight "click" sound, indicating that the transparent tracing plate 42 has been aligned with the artwork area on the electronic display screen 23. If the tracing position needs to be changed, the moving plate 41 is pushed again. The external force causes the retaining ball 432 to compress the spring 433 and retract into the telescopic groove, disengaging from the hemispherical slot 7, until it slides to the next slot position and re-engages, achieving precise positioning of multiple transparent tracing plates 42.

[0053] The user places their forearm on the silicone pad 9 of the extension tray 8, holds a special erasable writing pen, and copies the calligraphy model shown in the display window 10 below onto the transparent tracing board 42. The high light transmittance of the ultra-white tempered glass ensures that the user can clearly observe the stroke trends and structural layout of the model, while the anti-glare treatment avoids interference from ambient light, improving the accuracy of copying. After completing a practice session on the transparent tracing board 42, the user can push the T-shaped slider 46 along the T-shaped groove 44, causing the sponge strip 453 of the wiping strip 45 to move across the surface of the transparent tracing board 42. The sponge strip 453 absorbs the ink and wipes it away, restoring the transparent tracing board 42 to its clean state, allowing for reuse. If the cleaning effect of the sponge strip 453 decreases, it can be easily peeled off and replaced with a new sponge strip using the Velcro adhesive layer 452.

[0054] To compare different tracing effects, you can write different versions of the same character on multiple transparent tracing boards 42, and then move the moving board 41 to align it with the display window 10 in sequence to visually compare the differences and improve practice efficiency. After use, turn off the electronic display screen 23. If it is battery powered, store the device in a dry place; if it is connected to an external power source, simply unplug the power adapter.

[0055] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A calligraphy copying practice aid device, comprising a base (1), characterized in that: The base (1) has an operating cavity at its front end, and a matching electronic display component (2) is slidably installed in the operating cavity. The upper end of the base (1) has a display window (10) connected to the operating cavity. A pair of symmetrically distributed guide rails (5) are also fixedly installed on the upper end of the base (1). Matching guide shoes (6) are slidably installed on the guide rails (5). A copying component (4) is fixedly installed between the pair of guide shoes (6).

2. The calligraphy copying practice auxiliary device according to claim 1, characterized in that: The electronic display component (2) includes a mounting base (21), an outer protective plate (22) is fixedly installed at the front end of the mounting base (21), a mounting groove is opened at the upper end of the mounting base (21), a matching electronic display screen (23) is installed in the mounting groove, and guide rails (24) are fixedly installed on both the left and right sides of the operating cavity, and matching guide shoes (25) are slidably installed on the guide rails (24), and the guide shoes (25) are fixedly connected to the mounting base (21).

3. The calligraphy copying practice auxiliary device according to claim 2, characterized in that: A magnetic handle (26) is fixedly installed on the outer end of the outer protective plate (22), and a magnetic block (3) corresponding to the magnetic handle (26) is embedded in the front end of the base (1).

4. The calligraphy copying practice auxiliary device according to claim 3, characterized in that: The copying component (4) includes a movable plate (41), on which multiple linearly distributed transparent copying plates (42) are inlaid and installed, and the transparent copying plates (42) are matched with the electronic display screen (23). A synchronization plate (43) is fixedly installed between the movable plate (41) and the guide shoe (6).

5. The calligraphy copying practice auxiliary device according to claim 4, characterized in that: The upper end of the movable plate (41) is also provided with multiple sets of T-shaped grooves (44) symmetrically distributed about the transparent copying plate (42). Matching T-shaped sliders (46) are slidably installed in the T-shaped grooves (44), and a wiping strip (45) is fixedly installed between a pair of T-shaped sliders (46).

6. The calligraphy copying practice auxiliary device according to claim 5, characterized in that: The wiping strip (45) includes a fixing plate (451), and a sponge strip (453) is detachably installed on the lower end of the fixing plate (451) through an adhesive layer (452).

7. The calligraphy copying practice auxiliary device according to claim 5, characterized in that: The synchronization plate (43) includes a plate body (431), the lower end of the plate body (431) is provided with a telescopic groove, a retaining ball (432) is movably installed at the opening of the telescopic groove, a compression spring (433) is fixedly installed between the retaining ball (432) and the top wall of the telescopic groove, and two sets of hemispherical retaining grooves (7) with the same number as the synchronization plate (43) are provided on the upper surface of the base (1), and the hemispherical retaining grooves (7) match the retaining balls (432).

8. The calligraphy copying practice auxiliary device according to claim 1, characterized in that: The base (1) is fixedly installed with extension plates (8) at both ends, and a silicone pad (9) is fixedly installed on the upper end of the extension plates (8).

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