A nonwoven fabric tear detection device

Abstract

The present application relates to the technical field of non-woven fabric tear detection, and particularly relates to a non-woven fabric tear detection device. The slitting assembly comprises a mounting frame arranged on the rear side of a vertical plate, two rotating shafts are arranged on the vertical plate in a spaced manner, a guide sleeve and a full gear are arranged at the two ends of each rotating shaft, the full gears on the same side are meshed with each other, and a sliding frame is slidably arranged between the guide sleeves on the same rotating shaft. Through the integrated slitting assembly for cutting sample cloth, the contact type pushing cooperation between the pushing plate and the protruding end of the sliding frame is utilized to realize the cooperative control of the cutter I and the cutter II, so that the sample cloth can be cut and cut simultaneously, the sample cloth can be directly finished on the device, no additional mold or tool is needed, the preparation process of the sample is greatly simplified, and two rodless cylinders are further arranged to implement the tearing operation of the sample cloth, so that the cutting and tearing operations can be integrated to optimize the overall preparation process of the sample.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric tear detection technology, and in particular to a nonwoven fabric tear detection device. Background Technology

[0002] Tear testing of nonwoven fabrics is a crucial step in ensuring their quality and safety. Tear strength testing assesses the nonwoven material's resistance to tearing, which is essential for determining whether a product can meet specific requirements in practical applications. Furthermore, tear testing provides a scientific basis for the production and use of nonwoven fabrics, helping manufacturers optimize production processes and improve product quality, and assisting consumers in selecting nonwoven products that suit their needs.

[0003] The tongue-shaped tear test is a commonly used method for testing the tear strength of nonwoven fabrics. When testing the tear strength of nonwoven fabrics, it is usually necessary to trim the sample into a specific shape and cut a portion, then fix it on the testing machine for tensile tear testing. During this process, operators need to additionally cut the sample fabric using a special template before testing to ensure the sample size fits the fixtures of the specific testing machine. This makes the test preparation work cumbersome and time-consuming, increasing the complexity of the process. Furthermore, separating the cutting and testing operations may result in the sample size or shape not fitting the fixture, thus affecting the accuracy of the test results.

[0004] Therefore, it is particularly necessary to propose a nonwoven fabric tear testing device that integrates cutting functions, aiming to solve the above problems, simplify the sample preparation process, improve testing efficiency and data accuracy, thereby achieving more accurate and reliable tear performance testing, and ultimately improving the overall quality control level. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, the present invention provides a nonwoven fabric tear detection device that integrates cutting function.

[0006] The technical solution is: a nonwoven fabric tear detection device, comprising:

[0007] The base platform has a display platform and a vertical plate. Two rodless cylinders are mounted on the vertical plate, and each rodless cylinder has a clamp on its slider.

[0008] A slitting assembly for cutting sample fabric includes a mounting frame located on the rear side of a vertical plate. Two rotating shafts are rotatably mounted on the vertical plate at intervals. Each end of the rotating shaft is provided with a guide sleeve and a full gear. The full gears on the same side mesh with each other. A sliding frame is slidably mounted between the guide sleeves on the same rotating shaft. A cutter is provided on the inner walls of both sides of the front end of the sliding frame. The rear ends of the sliding frames are all placed inside the mounting frame, and each rear end of the sliding frame has a protruding end.

[0009] A support frame is mounted on the upper pivot. A second cutter slides through the front of the support frame. Symmetrically arranged guide rods are mounted on the support frame, and pulling components are mounted on the guide rods to assist the movement of the second cutter.

[0010] To further explain, the fixture includes positioning frames respectively set on the sliders of the two rodless cylinders. A threaded rod is threaded through and threaded onto one side of each positioning frame. The two threaded rods are arranged opposite each other. A clamping plate is set on the end of each threaded rod that is placed inside the positioning frame.

[0011] To further explain, the pulling assembly includes a push plate that is slidably disposed between the two guide rods. The push plate is in contact with the protruding end. An elastic element is disposed between the push plate and the inner wall of the support frame. A pulley is rotatably disposed at the rear end of the support frame. A pull rope is wound around the pulley. The two ends of the pull rope are respectively connected to the cutter and the push plate.

[0012] To further explain, it also includes a limiting plate. Each guide sleeve is equipped with a limiting plate for assisting in fixing the sample fabric, and each side of the sliding frame that is close to the other is equipped with an auxiliary wheel with an arrangement layout.

[0013] To further explain, it also includes crossbars. Crossbars are provided on both sides of the front end of the sliding frame. A fitting block is provided at the end of the lower crossbar, and a bracket is provided at the end of the upper crossbar. Both ends of the bracket are slidably provided with buckles. An elastic element is provided between the buckle and the corresponding bracket, and the buckle on the same side is properly matched with the corresponding fitting block.

[0014] To further explain, it also includes sleeves. Sleeves are provided on both the left and right sides of the upright plate. An extension rod is slidably inserted into each sleeve. Velcro for bonding and fixing the sample fabric is fitted on the extension rod. A movable block that is slidably connected to the mounting frame is provided at the rear end of each extension rod.

[0015] To further explain, it also includes a horizontal frame. A horizontal frame is provided on the lower front side of the upright plate. A hinged frame in a bent shape is provided between the two ends of the horizontal frame. A support plate for supporting the sample fabric is provided at the end of the hinged frame.

[0016] To further explain, it also includes insert rods. Insert rods that slide through both sides of the hinge frame and engage with the upright plate are provided. Each insert rod is provided with a plate. An elastic element is provided between the plate and the hinge frame. Each insert rod is provided with a holding frame at its end.

[0017] The beneficial effects are as follows: 1. By integrating a cutting component specifically designed for cutting sample fabric, this invention utilizes the contact-type pushing action between the push plate and the protruding end of the sliding frame to achieve coordinated control of cutter one and cutter two, thereby enabling simultaneous cutting and tearing of the sample fabric. This allows the sample fabric to be trimmed directly on the device without relying on additional molds or tools, greatly simplifying the sample preparation process. Furthermore, the device is equipped with two rodless cylinders for tearing the sample fabric, ensuring that cutting and tearing operations can be completed in one integrated manner, thereby optimizing the overall sample preparation process, reducing unnecessary preliminary steps, and improving the consistency and accuracy of sample testing during the testing process.

[0018] 2. By setting a crossbar, the two ends of the sliding frame can be extended to form an easy-to-grip operating end, ensuring that the sliding frame is easy to operate after being closed; at the same time, the ingenious combination of the buckle and the interlocking block ensures that the crossbar can be tightly closed, enhancing the stability and grip during operation.

[0019] 3. The extension rod specially designed in this invention is equipped with Velcro, which can effectively fix the position of the sample fabric during the cutting process, thereby further improving the stability and accuracy of the cutting process.

[0020] 4. By utilizing the support plate and its hinged frame design, this invention enables the support plate to be raised and lowered, ensuring that the sample fabric is well supported during tear testing, thereby guaranteeing the integrity of the sample fabric during the testing process and improving the reliability of the test results. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the assembly structure of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of the components of the present invention, including the upright plate, display platform, and rodless cylinder.

[0023] Figure 3 This is a three-dimensional structural cross-sectional view of the positioning frame, threaded rod, and clamping plate of the present invention.

[0024] Figure 4 This is a three-dimensional structural diagram of the sliding frame, the second cutter, and the crossbar of the present invention.

[0025] Figure 5 This is a three-dimensional cross-sectional view of a portion of the slitting component of the present invention.

[0026] Figure 6 This is a three-dimensional structural diagram of the disassembled components of the present invention, including the guide sleeve, the full gear, and the sliding frame.

[0027] Figure 7 This is a schematic diagram showing the usage state of the cutting component and crossbar after they are closed according to the present invention.

[0028] Figure 8 This is a three-dimensional structural cross-sectional view of the push plate, pulley, and pull rope components of the present invention.

[0029] Figure 9 This is a three-dimensional structural diagram of the sleeve, extension rod, and moving block components of the present invention.

[0030] Figure 10 This is a three-dimensional structural diagram of the cross frame, hinge frame, and support plate components of the present invention.

[0031] In the attached diagrams: 100: Sample fabric, 1: Base platform, 10: Vertical plate, 11: Display platform, 12: Rodless cylinder, 121: Positioning frame, 122: Threaded rod, 123: Clamping plate, 2: Cutting assembly, 20: Mounting frame, 21: Rotating shaft, 22: Guide sleeve, 221: Limiting plate, 23: Full gear, 24: Sliding frame, 241: Protruding end, 25: Auxiliary wheel, 26: Cutting blade one, 3: Support Frame, 31: Cutter II, 32: Guide rod, 33: Push plate, 34: Elastic component I, 35: Pulley, 36: Pull rope, 4: Crossbar, 41: Fitting block, 42: Bracket, 43: Buckle plate, 44: Elastic component II, 5: Sleeve, 51: Extension rod, 52: Moving block, 53: Velcro, 6: Crossbar, 61: Hinge frame, 62: Support plate, 63: Insert rod, 631: Holding frame, 64: Elastic component III. Detailed Implementation

[0032] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., 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 invention 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 invention.

[0033] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The technical solutions of the present invention will now be clearly and completely described in conjunction with the accompanying drawings. It should be understood that the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Example 1: A nonwoven fabric tear detection device, such as Figures 1-8 As shown, it includes:

[0035] A base platform 1 is provided, on which a display platform 11 and a vertical plate 10 are provided. The vertical plate 10 has strip grooves on both the left and right sides of the middle part. The vertical plate 10 is located to the left of the display platform 11. The display platform 11 is used to display test data to ensure that the operator can monitor the test progress in real time. Two vertically arranged rodless cylinders 12 are fixedly installed on the vertical plate 10. The slider of the rodless cylinder 12 is equipped with a sensor module. The sensor module is electrically connected to the display platform 11. At the same time, there is a gap between the sliders of the two rodless cylinders 12. The sliders of the rodless cylinders 12 are equipped with clamps to hold and fix the sample cloth 100 to be tested. By the two rodless cylinders 12 operating in opposite directions up and down, the clamped sample cloth 100 is torn in a tongue shape to achieve the test effect.

[0036] A slitting assembly 2 for cutting sample fabric 100 includes a mounting frame 20 fixedly mounted on the rear side of a vertical plate 10. The mounting frame 20 is hollow inside. Two rotating shafts 21 are rotatably mounted on the vertical plate 10 at intervals. The two rotating shafts 21 are vertically distributed, and each end of the rotating shaft 21 is provided with a guide sleeve 22 and a gear 23. The two gears 23 on the same side mesh with each other, allowing the two rotating shafts 21 to rotate synchronously. A sliding frame 24 is slidably mounted between the two guide sleeves 22 on the same rotating shaft 21. The two sliding frames 24 are vertically opposite each other. The rear end of the sliding frame 24 slides through the strip groove of the vertical plate 10 and extends into the mounting frame 20. At the same time, the sliding frame 24 can slide along the corresponding guide sleeve 22 in the back-and-forth direction. Due to the presence of the rotating shafts 21, the sliding frame 24 has the ability to tilt and rotate. Under the meshing action of the gears 23, the two sliding frames 24 can open and close (e.g., Figure 4 and Figure 7 As shown, to ensure stability during opening and closing, the lower sliding frame 24 is wider than the upper sliding frame 24, ensuring smooth rotation when the two are unfolded and intersected; a cutter 26 is provided on the inner walls of both sides at the front end of the sliding frame 24, and the blades of the two cutters 26 at the upper and lower positions are aligned to ensure the consistency of the cutting path of the sample fabric 100, and both have a protruding end 241 at the rear end of the sliding frame 24;

[0037] The support frame 3 is fixedly mounted on the upper rotating shaft 21. The support frame 3 is located inside the mounting frame 20, and the support frame 3 and the corresponding sliding frame 24 are at the same horizontal position. A forward-extending cutter 31 is slidably passed through the front side of the support frame 3. The cutter 31 slides in the front and back direction. At the same time, the cutter 31 can rotate synchronously with the support frame 3 and pass through the gap between the sliders of the rodless cylinder 12. A guide rod 32 with a symmetrical layout is provided between the front and rear inner walls of the support frame 3. A pulling component is provided on the guide rod 32 to assist the movement of the cutter 31. The pulling component can move the cutter 31 in coordination with the movement of the sliding frame 24, so as to ensure that while the cutter 26 is cutting the excess fabric on both sides of the sample fabric 100, the cutter 31 can simultaneously cut the tear of the sample fabric 100, realizing a one-piece continuous cutting operation of the sample fabric 100, thereby simplifying the pre-test preparation work, eliminating the need for additional tools, and allowing all cutting steps to be completed in the same testing device.

[0038] like Figure 2 and Figure 3 As shown, the fixture includes positioning frames 121 respectively mounted on the sliders of the two rodless cylinders 12. The front side of the positioning frame 121 has an opening. A threaded rod 122 is threaded through and threaded onto one side of each of the two positioning frames 121. The two threaded rods 122 are arranged opposite to each other. A clamping plate 123 is provided on the end of the threaded rod 122 that is inside the positioning frame 121.

[0039] like Figure 7 and Figure 8 As shown, the pulling assembly includes a push plate 33 slidably disposed between two guide rods 32. The overall length of the push plate 33 is greater than the width of the sliding frame 24, and the push plate 33 slides back and forth. The push plate 33 contacts and engages with the protruding end 241. An elastic element 34 is disposed between the push plate 33 and the inner wall of the support frame 3. In this embodiment, the elastic element 34 is a spring, which can provide the necessary elastic force for the reset movement of the push plate 33. A pulley 35 is embedded and rotatably disposed at the rear end of the support frame 3. A pull rope 36 is wound around the pulley 35. The two ends of the pull rope 36 are respectively connected to the second cutter 31 and the push plate 33. Through the connection of the pull rope 36, when the push plate 33 is pushed, it can synchronously pull the second cutter 31 to move, thereby realizing the driving of the second cutter 31 for cutting operation.

[0040] like Figures 4-7As shown, it also includes a limiting plate 221. The guide sleeve 22 is provided with a limiting plate 221 for assisting in fixing the sample fabric 100. The setting of the limiting plate 221 can increase the contact area between the guide sleeve 22 and the sample fabric 100. Thus, when the sliding frame 24 is in the closed state, the end of the sample fabric 100 is clamped and fixed by the action of the limiting plate 221, which further ensures the stability of the cutting position of the sample fabric 100 and prevents wrinkles, bends or deformations that may occur during the cutting process. In addition, auxiliary wheels 25 are rotatably arranged on the side of the sliding frame 24 that are close to each other to assist the movement of the sliding frame 24, thereby reducing the friction of the sliding frame 24 during the movement process, ensuring smooth contact between the sliding frame 24 and the sample fabric 100, and improving the stability and smoothness of the operation.

[0041] In use, first place the device on a stable table, and then prepare the sample fabric 100 to be tested. At this time, the two sliding frames 24 are in the unfolded state, and the sliders of the rodless cylinder 12 are aligned. Then, embed the sample fabric 100 into the two positioning frames 121 and position the second cutter 31 above the sample fabric 100. Then, turn the two threaded rods 122 to drive the corresponding clamping plates 123 closer to the sample fabric 100, so that the clamping plates 123 fit with the sample fabric 100, thereby clamping and fixing the position of the sample fabric 100. Then, the operator smooths the sample fabric 100 to ensure that the whole is in a flat state.

[0042] Next, the operator grasps the sliding frames 24 on both sides and pushes them towards a closed state. During this process, the sliding frames 24 simultaneously drive the guide sleeves 22 and the rotating shaft 21 on them to rotate, and the upper and lower opposing gears 23 mesh accordingly, further stabilizing the closing operation between the sliding frames 24. When the two sliding frames 24 are fully closed, the limiting plate 221 simultaneously contacts the sample fabric 100 and forms a clamp. At the same time, the second cutter 31 passes through the gap between the sliders of the rodless cylinder 12 and contacts the sample fabric 100. Then, the operator pulls the sample fabric 100 to unfold and pulls the sliding frames 24 forward, so that it moves along the opposite direction. The guide sleeve 22 slides, and during this process, the first cutter 26 simultaneously cuts the excess fabric on both sides of the sample fabric 100, thereby retaining the clamped fabric portion as the test sample fabric 100. When the sliding frame 24 moves to a certain distance, its protruding end 241 contacts the push plate 33, and as the sliding frame 24 moves, it pushes the push plate 33 to slide forward along the guide rod 32. Under the action of the pull rope 36, the connected second cutter 31 is pulled to move, causing the second cutter 31 to move backward, thereby cutting the slit at the end of the sample fabric 100, thus achieving the synchronous operation of overall cutting and slit cutting.

[0043] Once the sample fabric 100 has been cut, the sliding frame 24 is restored to the unfolded state and pushed back to the initial position. Then, the two rodless cylinders 12 are activated to move the slider up and down relative to each other to perform tongue tear detection, thereby performing tear detection on the sample fabric 100. At the same time, the display platform 11 displays the detection data synchronously, completing the entire detection process.

[0044] Example 2: Based on Example 1, such as Figure 4 and Figure 7 As shown, it also includes a crossbar 4. Crossbars 4 are provided on both the left and right sides of the front end of the sliding frame 24. A fitting block 41 is provided at the end of the lower crossbar 4, and a bracket 42 is provided at the end of the upper crossbar 4. A buckle plate 43 is slidably provided at both ends of the bracket 42. An elastic element 44 is provided between the buckle plate 43 and the corresponding bracket 42. In this embodiment, the elastic element 44 is a compression spring to ensure that the buckles 43 on both sides are always in a gathered state, and the buckles 43 on the same side are properly engaged with the corresponding fitting block 41, so that the two crossbars 4 on opposite sides can be stably joined together, further strengthening the positional stability of the sliding frame 24 after closing. When in use, by holding the crossbar 4, a convenient gripping point is provided when moving the sliding frame 24, thereby enhancing the control capability of the sliding frame 24 and facilitating subsequent operation steps.

[0045] like Figure 9 As shown, it also includes sleeves 5. Sleeves 5 are provided on both the left and right sides of the upright plate 10. An extension rod 51 is slidably inserted into each sleeve 5. Velcro 53 for bonding and fixing the sample cloth 100 is sleeved on the extension rod 51. A movable block 52 that is slidably connected to the mounting frame 20 is provided at the rear end of each extension rod 51.

[0046] By pulling the extension rods 51 on both sides forward, they extend out of the sleeve 5. The extension rods 51 can serve as support carriers on both sides of the bottom of the sample fabric 100. Due to the presence of the Velcro 53, the position of the sample fabric 100 can be firmly glued and fixed, ensuring that it remains flat. This allows the sample fabric 100 to maintain an ideal flatness during the cutting process. This not only makes the subsequent cutting operation more stable, but also reduces the steps of manually stretching and flattening the sample fabric 100, thereby reducing the operational burden.

[0047] like Figure 1 and Figure 10 As shown, it also includes a crossbeam 6. A crossbeam 6 is fixedly installed on the lower front side of the upright plate 10. A hinged frame 61 in a bent shape is hinged between the left and right ends of the crossbeam 6. A support plate 62 for supporting the sample fabric 100 is provided at the end of the hinged frame 61 to ensure that the sample fabric 100, especially the unclamped part, can be fully supported during the testing process, avoiding collapse due to lack of support, thereby preventing uneven stress on the sample fabric 100 and ensuring the accuracy of the test results.

[0048] like Figure 1 and Figure 10 As shown, it also includes insertion rods 63. Insertion rods 63 that are slidably inserted through the left and right sides of the hinge frame 61 and engage with the upright plate 10 are provided. When the hinge frame 61 is rotated and raised, the insertion rods 63 are inserted into the upright plate 10 to fix the rotation position of the hinge frame 61. Each insertion rod 63 is provided with a plate, and an elastic element 64 is provided between the plate and the hinge frame 61. In this embodiment, the elastic element 64 is a spring. Under the elastic force of the elastic element 64, the insertion rod 63 can automatically reset and lock in a stable position. The end of each insertion rod 63 is provided with a grip frame 631 to facilitate adjustment and fixation by the operator.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A nonwoven fabric tear detection device, comprising: A base (1) is provided with a display platform (11) and a vertical plate (10). Two rodless cylinders (12) are installed on the vertical plate (10). Each rodless cylinder (12) has a clamp on its slider. Its features include: a slitting assembly (2) for cutting sample fabric (100), the slitting assembly (2) including a mounting frame (20) disposed on the rear side of the upright plate (10), two rotating shafts (21) being rotatably disposed on the upright plate (10) at intervals, each of the two ends of the rotating shaft (21) being provided with a guide sleeve (22) and a full gear (23), the full gears (23) on the same side meshing with each other, a sliding frame (24) being slidably disposed between the guide sleeves (22) on the same rotating shaft (21), a cutter (26) being disposed on the inner walls of the two sides of the front end of the sliding frame (24), the rear ends of the sliding frame (24) being placed in the mounting frame (20), and each of the rear ends of the sliding frame (24) having a protruding end (241). A support frame (3) is set on the upper rotating shaft (21). A second cutter (31) is slidably passed through the front side of the support frame (3). A guide rod (32) with a symmetrical layout is set on the support frame (3). A pulling component for assisting the second cutter (31) to move is set on the guide rod (32). The pulling assembly includes a push plate (33) slidably disposed between the two guide rods (32), the push plate (33) is in contact with the protruding end (241), an elastic element (34) is disposed between the push plate (33) and the inner wall of the support frame (3), a pulley (35) is rotatably disposed at the rear end of the support frame (3), a pull rope (36) is wound on the pulley (35), and the two ends of the pull rope (36) are respectively connected to the cutter (31) and the push plate (33).

2. The nonwoven fabric tear detection device according to claim 1, characterized in that, The fixture includes positioning frames (121) respectively set on the sliders of the two rodless cylinders (12), and a threaded rod (122) is threaded through and threaded on one side of each of the two positioning frames (121). The two threaded rods (122) are arranged opposite to each other, and a clamping plate (123) is provided on the end of each threaded rod (122) inside the positioning frame (121).

3. The nonwoven fabric tear detection device according to claim 1, characterized in that, It also includes a limiting plate (221), and each of the guide sleeves (22) is provided with a limiting plate (221) for fixing the auxiliary sample fabric (100), and each of the sliding frames (24) is provided with an auxiliary wheel (25) arranged in a rotatable pattern on the side that is close to each other.

4. The nonwoven fabric tear detection device according to claim 3, characterized in that, It also includes a crossbar (4), and both sides of the front end of the sliding frame (24) are provided with crossbars (4). The lower crossbar (4) is provided with a fitting block (41) at the end of the lower crossbar (4), and the upper crossbar (4) is provided with a bracket (42). Both ends of the bracket (42) are slidably provided with buckles (43). An elastic element (44) is provided between the buckle (43) and the corresponding bracket (42), and the buckle (43) on the same side is properly fitted with the corresponding fitting block (41).

5. The nonwoven fabric tear detection device according to claim 4, characterized in that, It also includes sleeves (5), and sleeves (5) are provided on both the left and right sides of the upright plate (10). An extension rod (51) is slidably inserted into each of the sleeves (5) on both sides. Velcro (53) for bonding and fixing the sample cloth (100) is sleeved on the extension rod (51). A movable block (52) that is slidably connected to the mounting frame (20) is provided at the rear end of the extension rod (51).

6. The nonwoven fabric tear detection device according to claim 5, characterized in that, It also includes a cross frame (6), which is provided on the lower front side of the upright plate (10). A hinge frame (61) in a bent shape is provided between the two ends of the cross frame (6), and a support plate (62) for supporting the sample fabric (100) is provided at the end of the hinge frame (61).

7. The nonwoven fabric tear detection device according to claim 6, characterized in that, It also includes insert rods (63), and insert rods (63) that are slidably inserted through both sides of the hinge frame (61) and engaged with the upright plate (10) are provided. Each insert rod (63) is provided with a plate body, and an elastic element (64) is provided between the plate body and the hinge frame (61). Each insert rod (63) is provided with a gripping frame (631) at its end.

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