Device for detecting bonding defects of composite material

Abstract

The invention discloses a composite material bonding defect detection device, and relates to the technical field of bonding defect detection.The composite material bonding defect detection device comprises a base, a movable sliding table is installed at the top end of the base, a movable base is installed on the outer wall of the movable sliding table, and a mounting frame is fixedly connected to the outer wall of the movable base; the outer wall of the mounting frame is slidably connected with a movable rod, a probe, an ultrasonic detector, an adjusting mechanism and a mounting mechanism. By arranging an adjusting mechanism, a movable rod is pushed to slide in a movable groove until the bottom end of a rotating plate is in contact with a material, at the moment, a probe is in contact with the material, after completion, a rotating rod is rotated to be separated from the material, the rotating rod rotates to drive a toothed plate to move, and the toothed plate moves into a groove to be clamped with a clamping block; the position of the movable rod is fixed, so that the position of the probe is fixed, and the situation that the pressure between the probe and a material is too large due to the fact that the height of the probe shifts during detection is conveniently prevented.

Description

Technical Field

[0001] The invention relates to the technical field of bonding defect detection, in particular to a device for detecting bonding defects of composite materials. Background Art

[0002] The so-called composite material is a general term for materials that use various methods to combine materials with different physical and chemical properties into one, make up for the shortcomings of various materials, and obtain superior performance. Composite materials have countless types due to different types and combinations of materials. Generally speaking, there are substances that are compounded in physical and chemical aspects, such as: fiberglass, plastics with inorganic fillers, filled plastics with inorganic and organic combinations, combinations of plastics and metals, etc. In recent years, the use of multi-layer structural panels with foam plastics as core materials and metal plates as surface plates has rapidly expanded in construction, transport aircraft, and refrigeration equipment. The core materials are mostly made of foamed bodies such as polystyrene, polyurethane, polyvinyl chloride or phenolic resin. Among them, polystyrene foam is the most widely used. Polystyrene foam has good thermal insulation, water resistance, and water vapor permeability resistance. It has high strength at low density and is low in price. Aluminum alloy plates are ideal panel materials for multi-layer structural panels.

[0003] After bonding the composite materials, the materials need to be inspected for bonding defects. During the inspection, an ultrasonic detection probe is usually used for inspection. When using the probe, a protective film needs to be attached to the contact between the probe and the material to prevent the probe from being damaged due to friction between the probe and the material. At the same time, during the inspection, the pressure between the probe and the material needs to be maintained to avoid an increase in the pressure between the probe and the material, which may cause damage to the probe. However, manual movement of the probe is prone to changes in force, resulting in greater pressure between the probe and the material, affecting the use of the probe. In order to maintain the pressure between the probe and the material during inspection, a device for composite material bonding defect detection is provided. Summary of the invention

[0004] The purpose of the present invention is to provide a device for detecting bonding defects of composite materials in order to achieve the purpose of maintaining the pressure between the probe and the material during detection.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a device for detecting bonding defects of composite materials, comprising a base, a movable slide is installed at the top of the base, and a movable movable seat is installed on the outer wall of the movable slide, the outer wall of the movable seat is fixedly connected with a mounting frame, the outer wall of the mounting frame is slidably connected with a movable rod, and a probe is installed at the bottom end of the movable rod, the top of the base is located on one side of the movable slide and an ultrasonic detector is arranged, the probe and the ultrasonic detector are connected by a connecting line, the position of the movable rod is positioned by an adjusting mechanism, and the probe is installed by the mounting mechanism, the adjusting mechanism includes a movable groove, the movable groove is opened on the outer wall of the mounting frame, the inner wall of the movable groove is opened with a groove, the inner wall of the groove is fixedly connected with a block, the outer wall of the movable rod is slidably connected with a fixed seat, one end of the fixed seat is rotatably connected with a rotating rod, and the bottom end of the rotating rod is rotatably connected with a rotating plate.

[0006] As a further solution of the present invention: the adjusting mechanism also includes a toothed plate, which is slidably connected to the interior of the movable rod and extends to the outer wall of the movable rod, the bottom end of the toothed plate is fixedly connected to a connecting frame, the interior of the movable rod is rotatably connected to a first threaded rod extending to the interior of the connecting frame, one end of the first threaded rod is fixedly connected to a first bevel gear, the top end of the rotating rod is fixedly connected to a mounting shaft, the mounting shaft is rotatably connected to the interior of the fixed seat, the outer wall of the mounting shaft is fixedly connected to a second bevel gear, and the first bevel gear is in contact with the second bevel gear.

[0007] As a further solution of the present invention: the mounting mechanism includes a mounting groove, the mounting groove is opened at the bottom end of the movable rod, the inner wall of the mounting groove is slidably connected with a clamping block, the outer wall of the movable rod is rotatably connected with a rotating block, one end of the rotating block is fixedly connected with a second threaded rod running through the clamping block, the inside of the movable rod is slidably connected with a displacement block, a first spring is connected between the displacement block and the movable rod, and the bottom end of the displacement block is fixedly connected with a positioning rod extending to the inner cavity of the mounting groove.

[0008] As a further solution of the present invention: the mounting mechanism also includes a pushing block, the pushing block is fixedly connected to the outer wall of the connecting frame and contacts the displacement block, the top of the rotating plate is fixedly connected to a rotating column, the rotating column is rotatably connected to the inner wall of the rotating rod, the top of the rotating column is rotatably connected to a rotating disk, a second spring is connected between the top of the rotating disk and the rotating rod, the outer wall of the rotating column is fixedly connected to a protrusion, the inner wall of the rotating rod is provided with a vertical groove, and one end of the vertical groove is provided with an annular groove.

[0009] As a further solution of the present invention: the outer wall of the movable rod is in contact with the inner wall of the movable groove.

[0010] As a further solution of the present invention: the first bevel gear is meshed with the second bevel gear, and a first threaded hole is formed on the outer wall of the connecting frame, and the first threaded hole matches the first threaded rod.

[0011] As a further solution of the present invention: the outer wall of the tooth plate is in contact with the inner wall of the groove, and a clamping groove is provided on the outer wall of the tooth plate, and the clamping groove is clamped with the clamping block.

[0012] As a further solution of the present invention: the outer wall of the clamping block is fitted with the inner wall of the mounting groove, and a second threaded hole is formed on the outer wall of the clamping block, and the second threaded hole matches the second threaded rod.

[0013] As a further solution of the present invention: a slope is provided on one side of the displacement block, and one end of the push block contacts the slope.

[0014] As a further solution of the present invention: the outer wall of the rotating column fits with the inner wall of the rotating rod, and the outer wall of the protrusion fits with the inner walls of the vertical groove and the annular groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By setting the adjustment mechanism, the movable rod is pushed to slide in the movable groove until the bottom end of the rotating plate contacts the material. At this time, the probe contacts the material. After completion, the rotating rod is rotated to separate from the material. The rotating rod rotates to drive the tooth plate to move. The tooth plate moves into the groove and engages with the card block, thereby fixing the position of the movable rod and the position of the probe, which is convenient for preventing the probe from being highly offset during detection, causing excessive pressure between the probe and the material;

[0017] 2. By setting the installation mechanism, the rotating rod is rotated to a vertical state. At this time, the positioning rod moves out of the installation slot and separates from one end of the clamping block, canceling the fixation of the clamping block, and the rotating plate is rotated to the bottom of the installation slot. The probe is placed into the inner cavity of the installation slot and the bottom end contacts the rotating plate. The rotating block is rotated to drive the clamping block to move and fix the probe to the bottom end of the movable rod. Then, the rotating plate is rotated to reset, and the positioning rod is inserted into the clamping block to fix the clamping block, which is convenient for fixing and installing the probe and preventing the probe from loosening during use. At the same time, it is ensured that after the rotating plate is reset, the bottom end of the rotating plate is flush with the bottom end of the probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the installation of the movable rod of the present invention;

[0020] Figure 3 is a cross-sectional view of the mounting frame of the present invention;

[0021] Figure 4 is a cross-sectional view of the movable rod of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the rotating rod of the present invention;

[0023] Figure 6 It is a schematic diagram of the installation of the clamp block of the present invention;

[0024] Figure 7 is a cross-sectional view of a rotating rod of the present invention;

[0025] Figure 8 It is a structural schematic diagram of the annular groove of the present invention.

[0026] In the figure: 1, base; 2, movable slide; 3, movable seat; 4, mounting frame; 5, movable rod; 6, probe; 7, adjustment mechanism; 701, movable groove; 702, groove; 703, clamping block; 704, fixed seat; 705, rotating rod; 706, rotating plate; 707, tooth plate; 708, connecting frame; 709, first threaded rod; 710, first bevel gear; 711, second bevel gear; 712, mounting shaft; 8, mounting mechanism; 801, mounting groove; 802, clamping block; 803, second threaded rod; 804, rotating block; 805, displacement block; 806, first spring; 807, positioning rod; 808, pushing block; 809, rotating disk; 810, second spring; 811, protrusion; 812, vertical groove; 813, annular groove; 814, rotating column; 9, ultrasonic detector; 10, connecting line. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0029] See also Figures 1 to 8 In an embodiment of the present invention, a device for detecting bonding defects of a composite material includes a base 1, a movable slide 2 is installed on the top of the base 1, a movable seat 3 is installed on the outer wall of the movable slide 2, a mounting frame 4 is fixedly connected to the outer wall of the movable seat 3, a movable rod 5 is slidably connected to the outer wall of the mounting frame 4, a probe 6 is installed on the bottom end of the movable rod 5, an ultrasonic detector 9 is arranged on the top of the base 1 on one side of the movable slide 2, the probe 6 and the ultrasonic detector 9 are connected by a connecting line 10, the position of the movable rod 5 is positioned by an adjusting mechanism 7, the probe 6 is installed by an installation mechanism 8, the adjusting mechanism 7 includes a movable groove 701, the movable groove 701 is opened on the outer wall of the mounting frame 4, a groove 702 is opened on the inner wall of the movable groove 701, and a block 703 is fixedly connected to the inner wall of the groove 702 The outer wall of the movable rod 5 is slidably connected to a fixed seat 704, one end of the fixed seat 704 is rotatably connected to a rotating rod 705, and the bottom end of the rotating rod 705 is rotatably connected to a rotating plate 706. The adjusting mechanism 7 also includes a toothed plate 707, the toothed plate 707 is slidably connected to the interior of the movable rod 5 and extends to the outer wall of the movable rod 5, the bottom end of the toothed plate 707 is fixedly connected to a connecting frame 708, the interior of the movable rod 5 is rotatably connected to a first threaded rod 709 extending to the interior of the connecting frame 708, one end of the first threaded rod 709 is fixedly connected to a first bevel gear 710, the top of the rotating rod 705 is fixedly connected to a mounting shaft 712, the mounting shaft 712 is rotatably connected to the interior of the fixed seat 704, the outer wall of the mounting shaft 712 is fixedly connected to a second bevel gear 711, and the first bevel gear 710 is in contact with the second bevel gear 711.

[0030] In this embodiment: the material is placed on the top of the base 1, and when the position of the probe 6 is adjusted, the rotating rod 705 is in a vertical state, and the bottom end of the probe 6 is kept flush with the bottom end of the rotating plate 706. At this time, the toothed plate 707 is not in contact with the block 703, and then the movable rod 5 is pushed to slide in the movable groove 701 until the bottom end of the rotating plate 706 contacts the material. At this time, the probe 6 contacts the material. After completion, the rotating rod 705 is rotated to separate from the material, and the rotating rod 705 rotates to drive the installation shaft 712 to rotate, and the installation shaft 712 rotates to drive the second bevel gear 7 11 rotates, the second bevel gear 711 rotates to drive the first bevel gear 710 to rotate, the first bevel gear 710 rotates to drive the first threaded rod 709 to rotate, the first threaded rod 709 rotates to drive the connecting frame 708 to move, the displacement of the connecting frame 708 drives the toothed plate 707 to move, the toothed plate 707 moves into the groove 702 and engages with the block 703, thereby fixing the position of the movable rod 5, thereby fixing the position of the probe 6, preventing the probe 6 from being highly offset during detection, causing excessive pressure between the probe 6 and the material.

[0031] Please refer to Figures 4 to 8 The mounting mechanism 8 includes a mounting groove 801, which is opened at the bottom end of the movable rod 5. The inner wall of the mounting groove 801 is slidably connected with a clamping block 802. The outer wall of the movable rod 5 is rotatably connected with a rotating block 804. One end of the rotating block 804 is fixedly connected with a second threaded rod 803 that runs through the clamping block 802. The inside of the movable rod 5 is slidably connected with a displacement block 805. A first spring 806 is connected between the displacement block 805 and the movable rod 5. The bottom end of the displacement block 805 is fixedly connected with a positioning rod 807 that extends to the inner cavity of the mounting groove 801. The mounting mechanism 8 also includes There is a pushing block 808, which is fixedly connected to the outer wall of the connecting frame 708 and contacts with the displacement block 805. The top of the rotating plate 706 is fixedly connected to a rotating column 814, and the rotating column 814 is rotatably connected to the inner wall of the rotating rod 705. The top of the rotating column 814 is rotatably connected to a rotating disk 809. A second spring 810 is connected between the top of the rotating disk 809 and the rotating rod 705. The outer wall of the rotating column 814 is fixedly connected to a protrusion 811. The inner wall of the rotating rod 705 is provided with a vertical groove 812, and one end of the vertical groove 812 is provided with an annular groove 813.

[0032] In this embodiment: when installing the probe 6, the rotating rod 705 is rotated to a vertical state. At this time, the displacement of the connecting frame 708 drives the pushing block 808 to move, and the displacement of the pushing block 808 drives the displacement block 805 to move, causing the first spring 806 to be squeezed. The displacement of the displacement block 805 drives the positioning rod 807 to move, and the positioning rod 807 moves out of the installation groove 801 and separates from one end of the clamping block 802, canceling the fixation of the first clamping block 802, and then pushes the rotating plate 706 downward, and the displacement of the rotating plate 706 drives the rotating column 814 to move, and the displacement of the rotating column 814 drives the protrusion 811 to move along the vertical groove 812 to the inner cavity of the annular groove 813, and the rotating column 814 moves through the rotating disk 809 to stretch the second spring 810, and then the rotating plate 706 is rotated to rotate the rotating plate 706. The second threaded rod 803 is rotated to drive the clamping block 802 to slide in the mounting groove 801, and the clamping block 802 is displaced to fix the probe 6 at the bottom end of the movable rod 5, and then the rotating plate 706 is rotated to reset. At the same time, after the position of the movable rod 5 is adjusted, the rotating rod 705 is rotated to drive the connecting frame 708 to move away from the displacement block 805, and the displacement block 805 is displaced by the elastic force of the first spring 806. The displacement of the displacement block 805 drives the positioning rod 807 to be inserted into the clamping block 802 and fixed to the other end of the clamping block 802, thereby fixing the clamping block 802, thereby preventing the probe 6 from loosening during use.

[0033] It is worth noting that the height of the vertical groove 812 is the same as the thickness of the rotating plate 706, so as to ensure that after the rotating plate 706 is reset, the bottom end of the rotating plate 706 remains flush with the bottom end of the probe 6.

[0034] Please refer to Figures 1 to 5 , the outer wall of the movable rod 5 is in contact with the inner wall of the movable groove 701.

[0035] In this embodiment, the movable rod 5 is pushed to slide in the movable groove 701 , and the movable rod 5 moves to drive the probe 6 to move and contact the material.

[0036] Please refer to Figures 1 to 5 The first bevel gear 710 is meshed with the second bevel gear 711 , and a first threaded hole is formed on the outer wall of the connecting frame 708 , and the first threaded hole matches the first threaded rod 709 .

[0037] In this embodiment: the rotating rod 705 is rotated to separate from the material, the rotating rod 705 rotates to drive the installation shaft 712 to rotate, the installation shaft 712 rotates to drive the second bevel gear 711 to rotate, the second bevel gear 711 rotates to drive the first bevel gear 710 to rotate, the first bevel gear 710 rotates to drive the first threaded rod 709 to rotate, and the first threaded rod 709 rotates to drive the connecting frame 708 to move.

[0038] Please refer to Figures 1 to 5 The outer wall of the tooth plate 707 fits with the inner wall of the groove 702 , and a slot is provided on the outer wall of the tooth plate 707 , which fits with the block 703 .

[0039] In this embodiment, the first threaded rod 709 rotates to drive the connecting frame 708 to move, and the displacement of the connecting frame 708 drives the tooth plate 707 to move, and the tooth plate 707 moves into the groove 702 and engages with the block 703, thereby fixing the position of the movable rod 5.

[0040] Please refer to Figures 4 to 8 The outer wall of the clamp block 802 fits with the inner wall of the mounting groove 801 , and a second threaded hole is formed on the outer wall of the clamp block 802 , which matches with the second threaded rod 803 .

[0041] In this embodiment: the probe 6 is placed into the inner cavity of the installation groove 801 and the bottom end is in contact with the rotating plate 706, the rotating block 804 drives the second threaded rod 803 to rotate, the second threaded rod 803 rotates to drive the clamping block 802 to slide in the installation groove 801, and the clamping block 802 moves to fix the probe 6 at the bottom end of the movable rod 5.

[0042] Please refer to Figures 4 to 8 A slope is provided on one side of the displacement block 805, and one end of the push block 808 contacts the slope.

[0043] In this embodiment: the displacement of the connecting frame 708 drives the pushing block 808 to move, the displacement of the pushing block 808 drives the displacement block 805 to move, causing compression on the first spring 806, and the displacement of the displacement block 805 drives the positioning rod 807 to move.

[0044] Please refer to Figures 4 to 8 The outer wall of the rotating column 814 fits with the inner wall of the rotating rod 705 , and the outer wall of the protrusion 811 fits with the inner walls of the vertical groove 812 and the annular groove 813 .

[0045] In this embodiment: the rotating plate 706 is pushed downward, and the displacement of the rotating plate 706 drives the rotating column 814 to move, and the displacement of the rotating column 814 drives the protrusion 811 to move along the vertical groove 812 to the inner cavity of the annular groove 813, and the rotating column 814 moves through the rotating disk 809 to stretch the second spring 810, and then the rotating plate 706 is rotated, and the protrusion 811 slides in the annular groove 813.

[0046] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for detecting bonding defects of composite materials, characterized in that: include: A base (1), wherein a movable slide (2) is installed at the top of the base (1), a movable seat (3) is installed on the outer wall of the movable slide (2), the outer wall of the movable seat (3) is fixedly connected to a mounting frame (4), the outer wall of the mounting frame (4) is slidably connected to a movable rod (5), a probe (6) is installed at the bottom end of the movable rod (5), an ultrasonic detector (9) is provided at the top of the base (1) on one side of the movable slide (2), and the probe (6) and the ultrasonic detector (9) are connected via a connecting line (10); The position of the movable rod (5) is positioned by an adjusting mechanism (7), and the probe (6) is installed by an installation mechanism (8). The adjusting mechanism (7) includes a movable groove (701), and the movable groove (701) is provided on the outer wall of the installation frame (4). The inner wall of the movable groove (701) is provided with a groove (702), and the inner wall of the groove (702) is fixedly connected with a block (703). The outer wall of the movable rod (5) is slidably connected with a fixed seat (704), and one end of the fixed seat (704) is rotatably connected with a rotating rod (705), and the bottom end of the rotating rod (705) is rotatably connected with a rotating plate (706).

2. A composite material bonding defect detection device according to claim 1, characterized in that: The adjusting mechanism (7) further comprises a tooth plate (707), wherein the tooth plate (707) is slidably connected to the interior of the movable rod (5) and extends to the outer wall of the movable rod (5); the bottom end of the tooth plate (707) is fixedly connected to a connecting frame (708); the interior of the movable rod (5) is rotatably connected to a first threaded rod (709) extending to the interior of the connecting frame (708); one end of the first threaded rod (709) is fixedly connected to a first bevel gear (710); the top end of the rotating rod (705) is fixedly connected to a mounting shaft (712); the mounting shaft (712) is rotatably connected to the interior of the fixed seat (704); the outer wall of the mounting shaft (712) is fixedly connected to a second bevel gear (711); the first bevel gear (710) is in contact with the second bevel gear (711).

3. The device for detecting bonding defects of composite materials according to claim 2, characterized in that: The mounting mechanism (8) comprises a mounting groove (801), wherein the mounting groove (801) is opened at the bottom end of the movable rod (5), the inner wall of the mounting groove (801) is slidably connected with a clamping block (802), the outer wall of the movable rod (5) is rotatably connected with a rotating block (804), one end of the rotating block (804) is fixedly connected with a second threaded rod (803) passing through the clamping block (802), the interior of the movable rod (5) is slidably connected with a displacement block (805), a first spring (806) is connected between the displacement block (805) and the movable rod (5), and the bottom end of the displacement block (805) is fixedly connected with a positioning rod (807) extending into the inner cavity of the mounting groove (801).

4. The device for detecting bonding defects of composite materials according to claim 3, characterized in that: The mounting mechanism (8) further comprises a pushing block (808), wherein the pushing block (808) is fixedly connected to the outer wall of the connecting frame (708) and contacts the displacement block (805); the top end of the rotating plate (706) is fixedly connected to a rotating column (814), wherein the rotating column (814) is rotatably connected to the inner wall of the rotating rod (705); the top end of the rotating column (814) is rotatably connected to a rotating disk (809), a second spring (810) is connected between the top end of the rotating disk (809) and the rotating rod (705); the outer wall of the rotating column (814) is fixedly connected to a protrusion (811); the inner wall of the rotating rod (705) is provided with a vertical groove (812), and one end of the vertical groove (812) is provided with an annular groove (813).

5. The device for detecting bonding defects of composite materials according to claim 2, characterized in that: The outer wall of the movable rod (5) fits the inner wall of the movable groove (701).

6. The device for detecting bonding defects of composite materials according to claim 2, characterized in that: The first bevel gear (710) is meshed with the second bevel gear (711), and a first threaded hole is formed on the outer wall of the connecting frame (708), and the first threaded hole matches the first threaded rod (709).

7. The device for detecting bonding defects of composite materials according to claim 2, characterized in that: The outer wall of the tooth plate (707) is in contact with the inner wall of the groove (702), and a clamping groove is provided on the outer wall of the tooth plate (707), and the clamping groove is clamped with the clamping block (703).

8. The device for detecting bonding defects of composite materials according to claim 4, characterized in that: The outer wall of the clamping block (802) fits with the inner wall of the mounting groove (801), and a second threaded hole is formed on the outer wall of the clamping block (802), and the second threaded hole matches the second threaded rod (803).

9. The device for detecting bonding defects of composite materials according to claim 4, characterized in that: A slope is provided on one side of the displacement block (805), and one end of the push block (808) is in contact with the slope.

10. The device for detecting bonding defects of composite materials according to claim 4, characterized in that: The outer wall of the rotating column (814) fits with the inner wall of the rotating rod (705), and the outer wall of the protrusion (811) fits with the inner walls of the vertical groove (812) and the annular groove (813).

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