Outdoor connecting terminal for cold-shrink cable

Abstract

The invention discloses a cold shrink cable outdoor connection terminal, and relates to the technical field of cable outdoor connection terminals. Comprising a cable body, a fixing cylinder is fixedly connected to the cable body, a conduit is arranged on the fixing cylinder, a cable core wire in the cable body penetrates through the interior of the fixing cylinder, and one end, extending out of the conduit, of the cable core wire is connected with a terminal body; a fixing mechanism is arranged on the guide pipe; a monitoring clamping mechanism is arranged at the top of the fixing mechanism, a mounting frame is arranged at the top of the central area of the fixing cylinder, and the mounting frame is fixedly connected with the top end of the terminal body; a protection mechanism is arranged on the mounting frame and located on the outer side of the terminal body, a magnetic attraction part is arranged at the top of the fixing cylinder, and a maintenance mechanism is attracted and fixed to the magnetic attraction part. According to the invention, the terminal main body can be effectively protected and maintained, the terminal main body is covered and shielded in severe weather, regular maintenance is effectively carried out, manual inspection and maintenance operations are saved, the service life of the connection terminal is prolonged, and the reliability of the connection terminal is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cable outdoor connection terminals, and in particular to a cold shrink cable outdoor connection terminal. Background Art

[0002] The cold shrink cable outdoor connection terminal is a terminal device for power cables, which is widely used in low-voltage, medium-voltage and high-voltage power systems, especially in outdoor environments, for cable joints and terminal processing. It adopts cold shrink technology, has the characteristics of simplicity, safety and reliability, and is widely used in power distribution, wind power, substations, underground cable laying and other fields; Unlike traditional heat shrink technology, the cold shrink cable terminal does not need to be heated, but is installed by mechanical shrinkage. When used, by putting the cold shrink material on the cable joint and applying a certain mechanical tension, the material will automatically shrink and fit tightly to the cable surface; The advantage of cold shrink technology is that the construction is simpler and faster, and no fire source is required, avoiding safety hazards during installation. The current connection terminal is not perfect in protection and maintenance measures. In bad weather, the connection terminal is exposed to the outside for a long time, the surface is easily corroded and damaged, and the service life is shortened. Based on this, the present invention proposes a cable outdoor connection terminal, which can effectively protect and maintain the terminal body, cover and shield the terminal body in bad weather, and effectively perform regular maintenance, saving manual inspection and maintenance operations, thereby improving the service life and reliability of the connection terminal. Summary of the invention

[0003] In response to the above technical problems, the present invention can effectively protect and maintain the terminal body, cover and shield the terminal body in bad weather, and effectively perform regular maintenance, saving manual inspection and maintenance operations, thereby improving the service life and reliability of the connection terminal.

[0004] The use scheme of the present invention is: a cold shrink cable outdoor connection terminal, including a cable body, a fixing cylinder fixedly connected to the cable body, a conduit arranged on the fixing cylinder, the cable core wire inside the cable body passes through the inside of the fixing cylinder and is fixed inside the conduit, and one end of the cable core wire extending out of the conduit is connected to the terminal body; a fixing mechanism is arranged on the conduit for fixing the cable core wire; a clamping mechanism is arranged at the bottom of the fixing cylinder for fixing the fixing cylinder to the cable body; a monitoring clamping mechanism is arranged on the top of the fixing mechanism, the monitoring clamping mechanism is located between the bottom end of the terminal body and the fixing mechanism, and is used to monitor the stability between the cable core wire and the terminal body ; A guide rod and a screw rod are arranged in the central area of ​​the fixed cylinder, and a mounting frame is arranged on the top of the guide rod and the screw rod, and the mounting frame is fixedly connected to the top of the terminal body; a protective mechanism is arranged on the mounting frame and located outside the terminal body, and the protective mechanism includes a mounting cylinder arranged on the mounting frame, and a folding protective layer is connected to the inside of the mounting cylinder, and a protective ring is attached to the bottom end of the folding protective layer, and the folding state of the folding protective layer is changed to shield and protect the terminal body; a magnetic suction part is arranged on the top of the fixed cylinder, and a maintenance mechanism is adsorbed and fixed on the magnetic suction part, and a control mechanism is slidably arranged on the guide rod and the screw rod; the control mechanism is used to control the movement of the protective mechanism and the maintenance mechanism.

[0005] Furthermore, the clamping mechanism includes a clamping plate slidably arranged at the bottom of the fixed cylinder, a sliding rod and a screw rod are arranged on the clamping plate, and an adjusting nut is rotatably arranged at the bottom of the fixed cylinder, and the adjusting nut and the screw rod form a spiral pair.

[0006] Furthermore, the fixing mechanism includes a fixing box arranged on the catheter, the bottom end of the fixing box is threadedly connected with an adjusting push ring, a push frame is telescopically arranged inside the fixing box, a spring 1 is connected between the push frame and the fixing box; the push frame is pushed by the adjusting push ring; a push wheel is arranged on the push frame, and a fixing seat is radially slidably arranged on the catheter, an inclined portion is arranged on the fixing seat, a spring 2 is connected between the fixing seat and the catheter, and the inclined portion is pushed by the push wheel to make the fixing seat move radially; the monitoring clamping mechanism is arranged on the top of the fixing box.

[0007] Furthermore, the monitoring clamping mechanism includes a pushing electric cylinder arranged on a fixed box, a fixing ring is arranged on the telescopic rod of the pushing electric cylinder, the fixing ring is fixed to the bottom end of the terminal body, an output sensor is arranged between the bottom end of the terminal body and the fixed box, and the output sensor is used to output and feedback the telescopic displacement signal of the terminal body.

[0008] Furthermore, a motor 1 is arranged on the mounting frame, and the motor 1 is used to drive a screw rod, and the screw rod is used to drive a control mechanism.

[0009] Furthermore, the control mechanism includes a control slide movably arranged on the guide rod and the screw rod, and the control slide and the screw rod form a spiral pair; a control electric cylinder is arranged on the circumference of the control slide, and a magnetic attraction part and a push rod are arranged on the telescopic rod of the control electric cylinder, and the magnetic attraction part is used to magnetically fix the protection mechanism and the maintenance mechanism.

[0010] Furthermore, the protective mechanism includes a monitoring camera arranged on the inner side of the protective ring, which is used to monitor the damage of the outer side of the terminal body; a matching magnetic attraction part 2 is arranged on the circumference of the protective ring, the magnetic attraction part extends to the inner side of the matching magnetic attraction part 2 and cooperates with the matching magnetic attraction part 2, and is magnetically fixed by the magnetic attraction part; a buckle plate is telescopically arranged on the matching magnetic attraction part 2, and a buckle groove is opened on the mounting frame, and the buckle plate is buckled with the buckle groove to fix the protective ring; a buckle spring is connected between the buckle plate and the protective ring, and the buckle plate is pushed by a push rod to release the buckle state with the buckle groove.

[0011] Furthermore, the maintenance mechanism includes a maintenance slide, which is adsorbed and fixed by a magnetic attraction portion on the top of the fixed cylinder, and the maintenance slide is slidably installed on the guide rod. A maintenance ring is provided on the maintenance slide, and the maintenance ring is located on the outside of the conduit and the terminal body. An air flow pump is provided on the maintenance ring, and air flow holes are arranged on the inner side of the maintenance ring to clean and maintain the surface of the terminal body. A matching magnetic attraction portion 1 is provided on the maintenance ring, and the magnetic attraction portion extends to the inner side of the matching magnetic attraction portion 1 and matches with the matching magnetic attraction portion 1, and is magnetically fixed by the magnetic attraction portion.

[0012] Compared with the prior art, the present invention has the following advantages: (1) The fixing ring is fixed at the bottom of the terminal body. In daily use, the fixing ring is controlled to move by pushing the electric cylinder, that is, a preset load is applied. If the fixing ring is displaced, the output sensor can output a displacement signal of the terminal body to feedback the tightness of the terminal body and the cable core wire, that is, the terminal body and the cable core wire can be detected; (2) In various complex and severe weather conditions, the terminal body can be shielded and protected by a protective mechanism. For example, in windy and sandy weather or strong ultraviolet weather, the terminal body can be covered to play a protective role, that is, to prevent it from being damaged in severe weather. The surface is damaged, shortening the service life; (3) On the inner side of the protective ring, the surface condition of the terminal body can be monitored by a monitoring camera for timely maintenance; (4) For sand and dust impurities remaining on the surface of the terminal body, the magnetic suction part can be controlled by controlling the electric cylinder to move. The magnetic suction part extends to the inner side of the matching magnetic suction part and cooperates with the matching magnetic suction part, and is magnetically fixed by the magnetic suction part, and then drives the maintenance slide to move. The maintenance ring moves along the outer side of the terminal body, and the airflow is transmitted by the airflow pump. The airflow is released from the inner side of the maintenance ring to maintain and clean the surface of the terminal body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 It is a schematic diagram of the cable core wire installation structure of the present invention.

[0015] Figure 3 This is a schematic diagram of the structure of the monitoring clamping mechanism of the present invention.

[0016] Figure 4 It is a schematic diagram of the cross-sectional structure of the fixed box of the present invention.

[0017] Figure 5 It is a schematic diagram of the internal installation structure of the fixed box of the present invention.

[0018] Figure 6 It is a schematic diagram of the installation structure of the fixing seat of the present invention.

[0019] Figure 7 It is a schematic diagram of the installation structure of the fixed cylinder of the present invention.

[0020] Figure 8 This is a schematic diagram of the control mechanism installation structure of the present invention.

[0021] Fig. 9 It is a schematic diagram of the installation structure of the protection mechanism of the present invention.

[0022] Fig.10 It is a schematic diagram of the partial structure of the protection mechanism of the present invention.

[0023] 1-cable body; 101-cable core wire; 2-fixing cylinder; 3-clamping plate; 4-slide rod; 5-adjusting nut; 6-screw rod; 7-conduit; 8-terminal body; 9-fixing box; 10-fixing ring; 11-pushing electric cylinder; 12-output sensor; 13-adjusting push ring; 14-push frame; 15-spring one; 16-fixing seat; 17-spring two; 18-oblique part; 19-push wheel; 20-guide rod; 21-screw rod; 22-maintenance ring; 23-air flow pump; 24-maintenance slide; 25-matching magnetic suction part one; 26-motor one; 27-mounting frame; 28-mounting cylinder; 30-control slide; 31-control electric cylinder; 32-push rod; 33-magnetic suction part; 34-folding protective layer; 35-protection ring; 3501-matching magnetic suction part two; 36-buckle plate; 37-buckle spring; 38-monitoring camera. DETAILED DESCRIPTION

[0024] Example: Figures 1 to 10As shown, a fixing cylinder 2 is fixedly connected to the cable body 1, a conduit 7 is arranged on the fixing cylinder 2, a cable core 101 inside the cable body 1 passes through the inside of the fixing cylinder 2 and is fixed inside the conduit 7, and one end of the cable core 101 extending out of the conduit 7 is connected to the terminal body 8; a fixing mechanism is arranged on the conduit 7 for fixing the cable core 101; a clamping mechanism is arranged at the bottom of the fixing cylinder 2 for fixing the fixing cylinder 2 to the cable body 1; the clamping mechanism includes a clamping plate 3 slidably arranged at the bottom of the fixing cylinder 2, a sliding rod 4 and a screw 6 are arranged on the clamping plate 3, and an adjusting nut 5 is rotatably arranged at the bottom of the fixing cylinder 2, and the adjusting nut 5 and the screw 6 form a spiral pair.

[0025] A monitoring clamping mechanism is arranged on the top of the fixing mechanism, and the monitoring clamping mechanism is located between the bottom end of the terminal body 8 and the fixing mechanism, and is used to monitor the stability between the cable core wire 101 and the terminal body 8; the fixing mechanism includes a fixing box 9 arranged on the conduit 7, and the bottom end of the fixing box 9 is threadedly connected with an adjusting push ring 13, and a push frame 14 is telescopically arranged inside the fixing box 9, and a spring 15 is connected between the push frame 14 and the fixing box 9; the push frame 14 is pushed by the adjusting push ring 13; a push wheel 19 is arranged on the push frame 14, and a fixing seat 16 is radially slidably arranged on the conduit 7, The fixed seat 16 is provided with an inclined portion 18, a spring 17 is connected between the fixed seat 16 and the conduit 7, and the inclined portion 18 is pushed by a push wheel 19 to make the fixed seat 16 move radially; the monitoring clamping mechanism is arranged on the top of the fixed box 9; the monitoring clamping mechanism includes a pushing electric cylinder 11 arranged on the fixed box 9, and a fixing ring 10 is arranged on the telescopic rod of the pushing electric cylinder 11, and the fixing ring 10 is fixed to the bottom end of the terminal body 8, and an output sensor 12 is arranged between the bottom end of the terminal body 8 and the fixed box 9, and the output sensor 12 is used to output feedback of the telescopic displacement signal of the terminal body 8.

[0026] A guide rod 20 and a screw rod 21 are arranged in the central area of ​​the fixed cylinder 2, and a mounting frame 27 is arranged on the top of the guide rod 20 and the screw rod 21, and the mounting frame 27 is fixedly connected to the top of the terminal body 8; a protective mechanism is arranged on the mounting frame 27 and located on the outside of the terminal body 8, and the protective mechanism includes a mounting cylinder 28 arranged on the mounting frame 27, and a folding protective layer 34 is connected to the inside of the mounting cylinder 28, and a protective ring 35 is attached to the bottom end of the folding protective layer 34, and the folding state of the folding protective layer 34 is changed to shield and protect the terminal body 8; a magnetic attraction part is arranged on the top of the fixed cylinder 2, and a maintenance mechanism is adsorbed and fixed on the magnetic attraction part, and a control mechanism is slidably arranged on the guide rod 20 and the screw rod 21; the control mechanism is used to control the movement of the protective mechanism and the maintenance mechanism; a motor 26 is arranged on the mounting frame 27, and the motor 26 is used to drive the screw rod 21, and the screw rod 21 is used to drive the control mechanism.

[0027] The control mechanism includes a control slide 30 movably arranged on the guide rod 20 and the screw rod 21, and the control slide 30 and the screw rod 21 form a spiral pair; a control electric cylinder 31 is arranged on the circumference of the control slide 30, and a magnetic attraction part 33 and a push rod 32 are arranged on the telescopic rod of the control electric cylinder 31, and the magnetic attraction part 33 is used for magnetically fixing the protection mechanism and the maintenance mechanism.

[0028] The protection mechanism includes a monitoring camera 38 arranged on the inner side of the protection ring 35, which is used to monitor the damage of the outer side of the terminal body 8; a matching magnetic attraction part 3501 is arranged on the circumference of the protection ring 35, and the magnetic attraction part 33 extends to the inner side of the matching magnetic attraction part 3501 and cooperates with the matching magnetic attraction part 3501, and is magnetically fixed by the magnetic attraction part 33; a buckle plate 36 is telescopically arranged on the matching magnetic attraction part 3501, and a buckle groove is opened on the mounting frame 27, and the buckle plate 36 is buckled with the buckle groove to fix the protection ring 35; a buckle spring 37 is connected between the buckle plate 36 and the protection ring 35, and the buckle plate 36 is pushed by the push rod 32 to release the buckle state with the buckle groove.

[0029] The maintenance mechanism includes a maintenance slide 24, which is fixed by adsorption through the magnetic part on the top of the fixed cylinder 2. The maintenance slide 24 is slidably installed on the guide rod 20. A maintenance ring 22 is arranged on the maintenance slide 24. The maintenance ring 22 is located outside the conduit 7 and the terminal body 8. An airflow pump 23 is arranged on the maintenance ring 22, and airflow holes are arranged on the inner side of the maintenance ring 22 to clean and maintain the surface of the terminal body 8. A matching magnetic part 25 is arranged on the maintenance ring 22. The magnetic part 33 extends to the inner side of the matching magnetic part 25 and cooperates with the matching magnetic part 25, and is fixed by magnetic attraction through the magnetic part 33.

[0030] The operating principle is as follows: the fixing tube 2 is fixed on the cable body 1. Specifically, by adjusting the adjusting nut 5, the clamping plate 3 is moved, and then the clamping plate 3 clamps and fixes the cable body 1 to achieve fixation. The cable core wire 101 passes through the inside of the fixing tube 2 and penetrates the inside of the conduit 7, extends to the top of the conduit 7 and is connected to the terminal body 8. By rotating the adjusting push ring 13, the adjusting push ring 13 moves to push the push frame 14, that is, the push wheel 19 pushes the inclined portion 18, and then the fixing seat 16 moves and fixes the cable core wire 101, that is, the cable core wire 101 is fixed on the conduit 7.

[0031] The fixing ring 10 is fixed at the bottom end of the terminal body 8. In daily use, the movement of the fixing ring 10 is controlled by pushing the electric cylinder 11, that is, a preset load is applied. If the fixing ring 10 is displaced, the output sensor 12 can output a displacement signal of the feedback terminal body 8, that is, the tightness detection of the terminal body 8 and the cable core wire 101 is realized.

[0032] In various complex and severe weather conditions, the terminal body 8 can be shielded and protected by a protective mechanism. For example, in windy and sandy weather or strong ultraviolet weather, the terminal body 8 can be covered to play a protective role, that is, to prevent its surface from being damaged and shortening its service life in severe weather. Specifically, the electric cylinder 31 is controlled to control the movement of the magnetic suction part 33, and the magnetic suction part 33 extends to the inner side of the matching magnetic suction part 3501 and cooperates with the matching magnetic suction part 3501, and is magnetically fixed by the magnetic suction part 33, and the buckle plate 36 is pushed by the push rod 32 to release the magnetic suction part 33. In addition to the engagement state with the engagement groove; through the operation of the motor 26, the screw rod 21 rotates, so that the control slide 30 drives the protective ring 35 to move, and the protective ring 35 moves along the outside of the terminal body 8, and the maintenance slide 24 changes the folding state and is sleeved on the outside of the terminal body 8 to play a protective role. The operator can add a coating to the surface of the folding protective layer 34 according to needs, that is, anti-strong ultraviolet rays, anti-strong light and other materials; at the same time, on the inner side of the protective ring 35, the surface condition of the terminal body 8 can be monitored by the monitoring camera 38 to facilitate timely maintenance.

[0033] For the sand, dust and other impurities remaining on the surface of the terminal body 8, the magnetic suction part 33 can be controlled to move by controlling the electric cylinder 31. The magnetic suction part 33 extends to the inner side of the matching magnetic suction part 25 and cooperates with the matching magnetic suction part 25, and is magnetically fixed by the magnetic suction part 33, and then drives the maintenance slide 24 to move. The maintenance ring 22 moves along the outer side of the terminal body 8, and the airflow is transmitted by the airflow pump 23. The airflow is released from the inner side of the maintenance ring 22 to maintain and clean the surface of the terminal body 8.

Claims

1. A cold shrink cable outdoor connection terminal, comprising a cable body (1), a fixing tube (2) fixedly connected to the cable body (1), a guide tube (7) arranged on the fixing tube (2), a cable core wire (101) inside the cable body (1) passing through the inside of the fixing tube (2) and fixed inside the guide tube (7), and an end of the cable core wire (101) extending out of the guide tube (7) is connected to a terminal body (8); the characteristics are: A fixing mechanism is arranged on the conduit (7) for fixing the cable core wire (101); a clamping mechanism is arranged at the bottom of the fixing tube (2) for fixing the fixing tube (2) and the cable body (1); a monitoring clamping mechanism is arranged at the top of the fixing mechanism, the monitoring clamping mechanism is located between the bottom end of the terminal body (8) and the fixing mechanism, and is used to monitor the stability between the cable core wire (101) and the terminal body (8); a guide rod (20) and a screw rod (21) are arranged in the central area of ​​the fixing tube (2), a mounting frame (27) is arranged at the top of the guide rod (20) and the screw rod (21), and the mounting frame (27) is fixedly connected to the top of the terminal body (8). The invention relates to a device for protecting the terminal body (8) by providing a protective mechanism on the mounting frame (27) and located outside the terminal body (8), wherein the protective mechanism comprises a mounting tube (28) arranged on the mounting frame (27), wherein a folding protective layer (34) is connected to the inside of the mounting tube (28), and a protective ring (35) is attached to the bottom end of the folding protective layer (34), and the folding state of the folding protective layer (34) is changed to shield and protect the terminal body (8); a magnetic attraction portion is arranged on the top of the fixing tube (2), and a maintenance mechanism is fixedly attached to the magnetic attraction portion, and a control mechanism is slidably arranged on the guide rod (20) and the screw rod (21); and the control mechanism is used to control the movement of the protective mechanism and the maintenance mechanism.

2. The cold shrink cable outdoor connection terminal according to claim 1, characterized in that: The clamping mechanism comprises a clamping plate (3) slidably arranged at the bottom of the fixed cylinder (2), a sliding rod (4) and a screw rod (6) being arranged on the clamping plate (3), and an adjusting nut (5) rotatably arranged at the bottom of the fixed cylinder (2), the adjusting nut (5) and the screw rod (6) forming a spiral pair.

3. The cold shrink cable outdoor connection terminal according to claim 1, characterized in that: The fixing mechanism comprises a fixing box (9) arranged on the conduit (7), the bottom end of the fixing box (9) is connected with an adjusting push ring (13) by thread, a push frame (14) is telescopically arranged inside the fixing box (9), a spring (15) is connected between the push frame (14) and the fixing box (9); the push frame (14) is pushed by the adjusting push ring (13); a push wheel (19) is arranged on the push frame (14), and a fixing seat (16) is radially slidably arranged on the conduit (7), an inclined portion (18) is arranged on the fixing seat (16), a spring (17) is connected between the fixing seat (16) and the conduit (7), and the inclined portion (18) is pushed by the push wheel (19) so that the fixing seat (16) moves radially; and a monitoring clamping mechanism is arranged on the top of the fixing box (9).

4. The cold shrink cable outdoor connection terminal according to claim 3, characterized in that: The monitoring clamping mechanism comprises a pushing electric cylinder (11) arranged on a fixing box (9), a fixing ring (10) is arranged on a telescopic rod of the pushing electric cylinder (11), the fixing ring (10) is fixed to the bottom end of the terminal body (8), an output sensor (12) is arranged between the bottom end of the terminal body (8) and the fixing box (9), and the output sensor (12) is used to output a telescopic displacement signal of the terminal body (8) for feedback.

5. The cold shrink cable outdoor connection terminal according to claim 1, characterized in that: The mounting frame (27) is provided with a motor 1 (26), the motor 1 (26) is used to drive the screw rod (21), and the screw rod (21) is used to drive the control mechanism.

6. A cold shrink cable outdoor connection terminal according to claim 5, characterized in that: The control mechanism comprises a control slide (30) movably arranged on a guide rod (20) and a screw rod (21), and the control slide (30) and the screw rod (21) form a spiral pair; a control electric cylinder (31) is arranged on the circumference of the control slide (30), and a magnetic attraction part (33) and a push rod (32) are arranged on the telescopic rod of the control electric cylinder (31), and the magnetic attraction part (33) is used for magnetically attracting and fixing the protection mechanism and the maintenance mechanism.

7. The cold shrink cable outdoor connection terminal according to claim 6, characterized in that: The protection mechanism comprises a monitoring camera (38) arranged on the inner side of the protection ring (35) for monitoring the damage of the outer side of the terminal body (8); a matching magnetic attraction part (3501) is arranged on the circumference of the protection ring (35), the magnetic attraction part (33) extends to the inner side of the matching magnetic attraction part (3501) and matches with the matching magnetic attraction part (3501), and is magnetically fixed by the magnetic attraction part (33); a buckle plate (36) is telescopically arranged on the matching magnetic attraction part (3501), a buckle groove is opened on the mounting frame (27), and the buckle plate (36) is buckled with the buckle groove to fix the protection ring (35); a buckle spring (37) is connected between the buckle plate (36) and the protection ring (35), and the buckle plate (36) is pushed by the push rod (32) to release the buckle state with the buckle groove.

8. The cold shrink cable outdoor connection terminal according to claim 6, characterized in that: The maintenance mechanism comprises a maintenance slide (24), the maintenance slide (24) is fixed by adsorption through a magnetic attraction portion at the top of a fixing cylinder (2), the maintenance slide (24) is slidably mounted on a guide rod (20), a maintenance ring (22) is arranged on the maintenance slide (24), the maintenance ring (22) is located outside the conduit (7) and the terminal body (8), an air flow pump (23) is arranged on the maintenance ring (22), and air flow holes are arranged inside the maintenance ring (22) to perform cleaning and maintenance on the surface of the terminal body (8), a matching magnetic attraction portion (25) is arranged on the maintenance ring (22), the magnetic attraction portion (33) extends to the inside of the matching magnetic attraction portion (25) and matches with the matching magnetic attraction portion (25), and is fixed by magnetic attraction through the magnetic attraction portion (33).

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