Adjustable car mobile phone holder

Abstract

The utility model relates to the technical field of bracket equipment attachment devices, and in particular to an adjustable car mobile phone bracket, which can be inserted into a cigarette lighter for positioning and charging a mobile phone, and can be coordinated with an adjusting suction cup for auxiliary support, so as to improve the stability of the device in supporting the mobile phone, thereby improving the working efficiency of the device and increasing practicality. The utility model comprises a mounting block and a supporting component, the supporting component is evenly mounted on the mounting block, the supporting component also comprises a sliding component, an auxiliary device, an adjusting device, a clamping mechanism and a charging device, the connecting end of the sliding component is connected to the connecting end of the mounting block, a plurality of groups of sliding grooves are arranged on the mounting block, the output end of the auxiliary device passes through the corresponding sliding grooves and is slidably connected to the mounting block, the sliding component is provided with a long groove, the adjusting device passes through the long groove and is slidably connected to the sliding component, and the clamping mechanism is evenly mounted on the adjusting device.

Description

Technical Field

[0001] The utility model relates to the technical field of bracket equipment attachment devices, in particular to an adjustable automobile mobile phone bracket. Background Art

[0002] Car phone holders play an important role in modern driving scenarios. As smartphones become an indispensable part of daily life, it is becoming more and more common to use mobile phones for navigation, answering calls or controlling music playback while driving. However, handheld operation of mobile phones greatly increases driving risks. Therefore, it is necessary to fix the mobile phone so that the driver can view the mobile phone screen within the field of vision without holding it, thereby reducing distraction and improving driving safety. The most common mobile phone support device currently available is the mobile phone holder; the mobile phone holder is a device used to support the mobile phone in daily life, and it has been widely used in the field of outdoor driving;

[0003] When using an existing mobile phone holder, first fix it on the car, try to make it level with the chest after the mobile phone is installed, and adjust the angle to place the mobile phone horizontally with the face for easy viewing; it is found in the use of existing mobile phone holders that there are various types of mobile phone holders, including suction cup type, air outlet type and magnetic type, most of which are single fixed, resulting in poor stability, thus resulting in low working efficiency of the equipment, resulting in poor practicality. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides an adjustable car mobile phone holder which can be inserted into a cigarette lighter for positioning and charging a mobile phone, and can be used in conjunction with an adjustable suction cup for auxiliary support, thereby improving the stability of the device in supporting the mobile phone, thereby improving the working efficiency of the device and increasing practicality.

[0005] The utility model discloses an adjustable automobile mobile phone holder, comprising a mounting block and a supporting assembly, wherein the supporting assembly is evenly mounted on the mounting block, the supporting assembly further comprising a sliding assembly, an auxiliary device, an adjusting device, a clamping mechanism and a charging device, wherein a connecting end of the sliding assembly is connected to a connecting end of the mounting block, a plurality of sliding grooves are arranged on the mounting block, an output end of the auxiliary device passes through corresponding sliding grooves and is slidably connected to the mounting block, a long groove is arranged on the sliding assembly, the adjusting device passes through the long groove and is slidably connected to the sliding assembly, the clamping mechanism is evenly mounted on the adjusting device, a through hole is arranged on the mounting block, and a connecting end of the charging device passes through the through hole and is fixedly fitted to the mounting block.

[0006] Preferably, the sliding assembly also includes a guide rail, a bolt, a slider, a support rod and a support arm. The connecting end of the guide rail is connected to the connecting end of the mounting block. The guide rail and the mounting block are provided with screw holes. Multiple groups of bolts pass through the corresponding screw holes and are threadedly connected to the guide rail and the mounting block. A slot is provided on the slider. The guide rail passes through the slot and is slidably connected to the slider. A capstan is provided on the slider. The connecting end of the support rod passes through the capstan and is rotatably connected to the slider. The connecting end of the support arm is connected to the connecting end of the support rod.

[0007] Preferably, the auxiliary device also includes a support plate, an adjusting knob, a rotating shaft and a rotating knob. The connecting end of the support plate passes through the slide groove and is slidably connected to the mounting block. A plurality of groups of adjusting holes are provided on the support plate. The plurality of groups of adjusting knobs pass through the corresponding adjusting holes and are threadedly connected to the support plate. An axial hole is provided on the support plate. The rotating shaft passes through the axial hole and is rotatably connected to the support plate. A through hole is provided on the rotating shaft. The support rod passes through the through hole and is slidably connected to the rotating shaft. A rotating hole is matched on the through hole. The rotating knob passes through the rotating hole and is threadedly connected to the rotating shaft.

[0008] Preferably, the adjusting device also includes an adjusting rod, a flap, a screw, a connecting plate, a spherical rod and a suction cup. The connecting end of the adjusting rod passes through the long slot and is slidably connected to the support arm. The long slot is equipped with a threaded hole. The screw passes through the threaded hole and is threadedly connected to the support arm. A groove is provided on the adjusting rod. The connecting end of the flap and the connecting end of the groove are rotatably connected. A connecting seat is provided on the flap. The connecting plate passes through the connecting seat and is rotatably connected to the flap. The connecting end of the spherical rod is connected to the connecting end of the connecting plate, and the output end of the spherical rod is rotatably connected to the connecting end of the suction cup.

[0009] Preferably, the clamping mechanism also includes a telescopic rod, a spring and an end cover, the connecting plate and the flap are penetrated with positioning holes, the telescopic rod passes through the positioning holes and is slidably connected to the connecting plate, the connecting end of the telescopic rod and the connecting end of the flap are movably clamped, the connecting ends of the multiple groups of springs are respectively fixedly mounted on the multiple groups of connecting ends of the telescopic rod, and the connecting ends of the multiple groups of end covers are respectively connected to the multiple groups of connecting ends of the telescopic rod.

[0010] Preferably, the charging device also includes a tension spring, a frame, a pull rod, a positioning plate, a wireless charger, a cigarette lighter adapter plug, an electric wire and a collecting head. The connecting end of the frame is connected to the connecting end of the support arm, the connecting end of the cigarette lighter adapter plug is connected to the connecting end of the mounting block, the input end of the electric wire passes through the through hole and is electrically connected to the output end of the cigarette lighter adapter plug, the output end of the electric wire is electrically connected to the input end of the wireless charger, the connecting end of the wireless charger is connected to the connecting end of the frame, a plurality of groups of pin holes are provided on the frame, the connecting ends of the plurality of groups of pull rods respectively pass through the corresponding pin holes and are slidably connected to the frame, the plurality of groups of tension springs are respectively fixedly mounted on the corresponding connecting ends of the pull rods, the connecting ends of the plurality of groups of positioning plates are respectively connected to the corresponding connecting ends of the pull rods, the connecting end of the collecting head is connected to the connecting end of the support arm, and the output end of the collecting head is fixedly mounted on the connecting end of the electric wire.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: in the process of supporting the mobile phone, the charging device is inserted into the hole of the cigarette lighter for positioning, and in the process of preliminary positioning the device, the auxiliary device is slid to position it, and the sliding sliding component is cooperated to make it and the auxiliary device cross-placed with a small amplitude, and it and the auxiliary device are fixed to form a triangular stable structure, during this process, the sliding adjustment device is height adjusted, and the fixing component of the flip adjustment device is cooperated to adsorb the car to fix the device, and the clamping mechanism extends out to clamp the adjustment device when the fixing component of the flip adjustment device is flipped, so that it is stored or unfolded, and the sliding charging device is adjusted to support the mobile phone, and the mobile phone is wirelessly charged in cooperation with the socket of the cigarette lighter for power supply, thereby improving the stability of the device supporting the mobile phone, thereby improving the working efficiency of the device, and thus increasing the practicality of an adjustable car mobile phone holder. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the connection structure of the mounting block and the guide rail of the utility model;

[0014] Figure 3 It is a partial enlarged structural schematic diagram of A of the utility model;

[0015] Figure 4 It is a partial enlarged structural schematic diagram of B of the utility model;

[0016] Markings in the attached drawings: 1, mounting block; 201, slide groove; 202, long groove; 203, through hole; 301, guide rail; 302, bolt; 303, slider; 304, support rod; 305, support arm; 306, screw hole; 307, slot; 308, capstan seat; 401, support plate; 402, adjustment knob; 403, rotating shaft; 404, knob; 405, adjustment hole; 406, rotating hole; 407, through hole; 408, shaft hole; 501, adjustment rod; 502, adjustment knob; 503, rotating shaft; 504, knob; 505, adjustment hole; 506, rotating hole; 507, through hole; 508, shaft hole; 501, adjustment rod; 509, adjustment knob; 501, adjustment rod; 509, adjustment knob; 501, adjustment rod; 501, adjustment knob; 502, adjustment knob; 503, rotating shaft; 504, knob; 505, adjustment hole; 506, rotating hole; 507, through hole; 508, shaft hole; 509, adjustment rod; 509, adjustment rod; 501, adjustment rod; 509, adjustment knob ...1, adjustment rod; 501, adjustment rod; 501, adjustment rod; 502, adjustment knob; 503, rotating shaft; 504, knob; 505, adjustment hole; 506, rotating hole; 507, through hole; 508, shaft hole; 509, adjustment 02, flap; 503, screw; 504, connecting plate; 505, spherical rod; 506, suction cup; 507, threaded hole; 508, groove; 509, connecting seat; 601, telescopic rod; 602, spring; 603, end cover; 604, positioning hole; 701, tension spring; 702, rack; 703, pull rod; 704, positioning plate; 705, wireless charger; 706, cigarette lighter adapter plug; 707, wire; 708, closing head; 709, pin hole. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0018] like Figures 1 to 4 As shown, an adjustable car mobile phone holder of the utility model comprises a mounting block 1 and a supporting assembly, the supporting assembly is evenly mounted on the mounting block 1, the supporting assembly also comprises a sliding assembly, an auxiliary device, an adjusting device, a clamping mechanism and a charging device, the connecting end of the sliding assembly is connected to the connecting end of the mounting block 1, a plurality of slide grooves 201 are arranged on the mounting block 1, the output end of the auxiliary device passes through the corresponding slide grooves 201 and is slidably connected to the mounting block 1, a long groove 202 is arranged on the sliding assembly, the adjusting device passes through the long groove 202 and is slidably connected to the sliding assembly, the clamping mechanism is evenly mounted on the adjusting device, a through hole 203 is arranged on the mounting block 1, the connecting end of the charging device passes through the through hole 203 and is fixedly fitted to the mounting block 1; in the process of supporting the mobile phone, The charging device is inserted into the hole of the cigarette lighter for positioning. During the preliminary positioning of the device, the auxiliary device is slid to position it. The sliding sliding component is cooperated to cross the auxiliary device with a small range. The auxiliary device is fixed to form a triangular stable structure. During this process, the sliding adjustment device is height adjusted. The fixing component of the flip adjustment device is cooperated to adsorb the car to fix the device. The clamping mechanism extends out to clamp the adjustment device when the fixing component of the flip adjustment device is flipped, so that it can be stored or unfolded. The sliding charging device is adjusted to support the mobile phone. The cigarette lighter socket is used to power the mobile phone to wirelessly charge the mobile phone, thereby improving the stability of the device's support for the mobile phone, thereby improving the work efficiency of the device and increasing practicality.

[0019] As a preferred embodiment of the above, the sliding assembly further includes a guide rail 301, a bolt 302, a slider 303, a support rod 304 and a support arm 305. The connecting end of the guide rail 301 is connected to the connecting end of the mounting block 1. The guide rail 301 and the mounting block 1 are provided with screw holes 306. Multiple groups of bolts 302 pass through the corresponding screw holes 306 and are threadedly connected to the guide rail 301 and the mounting block 1. The slider 303 is provided with a slot 307. The guide rail 301 passes through the slot 307 and is slidably connected to the slider 303. The slider 303 is provided with a capstan 308. The support The connecting end of the rod 304 passes through the capstan 308 and the slider 303 for rotational connection, and the connecting end of the support arm 305 is connected to the connecting end of the support rod 304; in the process of sliding adjustment of the device, the guide rail is fixed by rotating the bolt. In this process, the sliding slider slides along the path of the guide rail, and the slider is limited and stabilized by the guide rail. The angle is adjusted by rotating the support rod on the slider, so that the device and the car's central control are more closely fitted, which improves the convenience of human use, thereby improving the working efficiency of the equipment and increasing practicality.

[0020] As a preferred embodiment of the above embodiment, the auxiliary device also includes a support plate 401, an adjusting knob 402, a rotating shaft 403 and a rotating knob 404. The connecting end of the support plate 401 passes through the slide groove 201 and is slidably connected to the mounting block 1. A plurality of groups of adjusting holes 405 are provided on the support plate 401. The plurality of groups of adjusting knobs 402 pass through the corresponding adjusting holes 405 and are threadedly connected to the support plate 401. An axial hole 408 is provided on the support plate 401. The rotating shaft 403 passes through the axial hole 408 and is rotatably connected to the support plate 401. A through hole 407 is provided on the rotating shaft 403. The support rod 304 passes through the through hole 407 and is slidably connected to the rotating shaft 403. A matching through hole 407 is provided on the through hole 407. A rotating hole 406 is provided, and a rotating knob 404 passes through the rotating hole 406 and is threadedly connected to the rotating shaft 403; in the process of supporting the equipment, the support plate is slid to make it slide on the mounting block, and in the process of sliding, the supporting rod is driven to adjust its position through the rotating shaft connected thereto, and the supporting rod slides on the rotating shaft during the adjustment process and drives the rotating shaft to change its angle, and after adjustment, the rotating knob is turned to fix the position of the supporting rod, and the position of the supporting plate is fixed by turning the adjusting knob, so that a staggered triangular supporting structure is formed between the supporting rod and the supporting plate, which improves the supporting stability of the equipment while ensuring the fit, thereby improving the working efficiency of the equipment and increasing its practicality.

[0021] As a preferred embodiment of the above embodiment, the adjusting device also includes an adjusting rod 501, a flap 502, a screw 503, a connecting plate 504, a spherical rod 505 and a suction cup 506. The connecting end of the adjusting rod 501 passes through the long slot 202 and is slidably connected to the support arm 305. The long slot 202 is equipped with a threaded hole 507. The screw 503 passes through the threaded hole 507 and is threadedly connected to the support arm 305. The adjusting rod 501 is provided with a groove 508. The connecting end of the flap 502 is rotatably connected to the connecting end of the groove 508. The flap 502 is provided with a connecting seat 509. The connecting plate 504 passes through the connecting seat 509 and is rotatably connected to the flap 502. The spherical rod 505 is connected to the suction cup 506. The connecting end of the spherical rod 505 is connected to the connecting end of the connecting plate 504, and the output end of the spherical rod 505 is rotatably connected to the connecting end of the suction cup 506; in the process of supporting the mobile phone, the sliding adjustment rod makes it slide and retract in the support arm to adjust the height, and it is fixed by rotating the screw. In this process, the flap is flipped to make it retract from the groove, and it is stored in the groove when it is stored. When the flap is flipped, the connecting plate is flipped at the same time, so that the output end of the spherical rod and the specific connection position of the car's central control are fitted, and adsorbed by the suction cup, so as to improve the clamping stability of the equipment, thereby improving the working efficiency of the equipment and increasing its practicality.

[0022] As a preferred embodiment of the above embodiment, the clamping mechanism also includes a telescopic rod 601, a spring 602 and an end cover 603. The connecting plate 504 and the flap 502 are penetrated by a positioning hole 604. The telescopic rod 601 passes through the positioning hole 604 and is slidably connected to the connecting plate 504. The connecting end of the telescopic rod 601 and the connecting end of the flap 502 are movably clamped. The connecting ends of the multiple groups of springs 602 are respectively fixedly mounted with the multiple groups of connecting ends of the telescopic rod 601, and the connecting ends of the multiple groups of end covers 603 are respectively connected with the multiple groups of connecting ends of the telescopic rod 601. In the process of clamping the flap, in the process of storing or unfolding, as the flap is flipped, different connecting ends of the telescopic rod are matched with the positioning holes, and the telescopic rod is driven to reset by the action of the spring. The telescopic rod is usually in an inserted clamping state. When the flap needs to be flipped, it is pulled out and reset by the spring. In this process, the end cover is added to improve the convenience of pulling and the stability of the insertion and clamping of the device, thereby improving the use stability of the device, thereby improving the working efficiency of the device and increasing the practicality.

[0023] As a preferred embodiment of the above embodiment, the charging device also includes a tension spring 701, a frame 702, a pull rod 703, a positioning plate 704, a wireless charger 705, a cigarette lighter adapter plug 706, a wire 707 and a bundle head 708. The connecting end of the frame 702 is connected to the connecting end of the support arm 305, the connecting end of the cigarette lighter adapter plug 706 is connected to the connecting end of the mounting block 1, the input end of the wire 707 passes through the through hole 203 and is electrically connected to the output end of the cigarette lighter adapter plug 706, the output end of the wire 707 is electrically connected to the input end of the wireless charger 705, the connecting end of the wireless charger 705 is connected to the connecting end of the frame 702, and a plurality of groups of pin holes 709 are provided on the frame 702. The connecting ends of the plurality of groups of pull rods 703 respectively pass through the corresponding pin holes 709 and are all slidably connected to the frame 702. The plurality of groups of tension springs 701 They are respectively fixedly mounted on the connecting ends of the corresponding pull rods 703, the connecting ends of the multiple groups of positioning plates 704 are respectively connected to the connecting ends of the corresponding pull rods 703, the connecting end of the closing head 708 is connected to the connecting end of the support arm 305, and the output end of the closing head 708 is fixedly mounted on the connecting end of the wire 707; in the process of clamping the mobile phone, the pull rod is pulled to drive the positioning plate to open, and the pull rod is reset by the tension spring, and the resistance of the mobile phone is cooperated to form a reverse thrust on the positioning plate to fix it. In this process, the charging position of the mobile phone is fitted with the wireless charger on the back of the frame, and power is supplied by inserting the cigarette lighter adapter plug into the cigarette lighter socket. In the process of power supply, the wires are fixed by installing multiple groups of closing heads, so as to improve the functionality of the equipment, thereby improving the working efficiency of the equipment and increasing practicality.

[0024] The utility model discloses an adjustable car mobile phone holder, which, when working, is positioned by inserting a charging device into a hole of a cigarette lighter, and in the process of preliminary positioning of the device, a sliding auxiliary device is slid to position it, and a sliding sliding component is cooperated to cross the auxiliary device with a small range, and a triangular stable structure is formed by fixing the auxiliary device and the sliding adjustment device. In this process, the sliding adjustment device is height-adjusted, and a fixing component of the flip adjustment device is cooperated to adsorb the car to fix the device, and a clamping mechanism extends out to clamp the adjustment device when the fixing component of the flip adjustment device is flipped, so that the adjustment device is stored or unfolded, and the sliding charging device is adjusted to support the mobile phone, and the mobile phone is wirelessly charged in cooperation with the socket of the cigarette lighter for power supply.

[0025] The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

[0026] The “first”, “second” and “third” mentioned in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An adjustable car mobile phone holder, comprising a mounting block (1) and a support assembly, wherein the support assembly is evenly mounted on the mounting block (1); characterized in that: The support assembly further comprises a sliding assembly, an auxiliary device, an adjusting device, a clamping mechanism and a charging device; the connecting end of the sliding assembly is connected to the connecting end of the mounting block (1); a plurality of sliding grooves (201) are provided on the mounting block (1); the output end of the auxiliary device passes through the corresponding sliding grooves (201) and is slidably connected to the mounting block (1); a long groove (202) is provided on the sliding assembly; the adjusting device passes through the long groove (202) and is slidably connected to the sliding assembly; the clamping mechanism is evenly mounted on the adjusting device; a through hole (203) is provided on the mounting block (1); the connecting end of the charging device passes through the through hole (203) and is fixedly mounted on the mounting block (1).

2. The adjustable car mobile phone holder according to claim 1, characterized in that: The sliding assembly further comprises a guide rail (301), a bolt (302), a slider (303), a support rod (304) and a support arm (305); a connecting end of the guide rail (301) is connected to a connecting end of the mounting block (1); screw holes (306) are provided through the guide rail (301) and the mounting block (1); a plurality of groups of bolts (302) respectively pass through corresponding screw holes (306) and are threadedly connected to the guide rail (301) and the mounting block (1); a clamping groove (307) is provided on the slider (303); the guide rail (301) passes through the clamping groove (307) and is slidably connected to the slider (303); a capstan (308) is provided on the slider (303); a connecting end of the support rod (304) passes through the capstan (308) and is rotatably connected to the slider (303); and a connecting end of the support arm (305) is connected to a connecting end of the support rod (304).

3. The adjustable car mobile phone holder according to claim 2, characterized in that: The auxiliary device also includes a support plate (401), an adjusting knob (402), a rotating shaft (403) and a rotating knob (404); the connecting end of the support plate (401) passes through the slide groove (201) and is slidably connected to the mounting block (1); a plurality of groups of adjusting holes (405) are provided on the support plate (401); the plurality of groups of adjusting knobs (402) respectively pass through the corresponding adjusting holes (405) and are all threadedly connected to the support plate (401); 1) is provided with an axial hole (408), the rotating shaft (403) passes through the axial hole (408) and is rotatably connected to the support plate (401), the rotating shaft (403) is penetrated by a through hole (407), the support rod (304) passes through the through hole (407) and is slidably connected to the rotating shaft (403), the through hole (407) is matched with a rotating hole (406), and the rotating knob (404) passes through the rotating hole (406) and is threadedly connected to the rotating shaft (403).

4. The adjustable car mobile phone holder as claimed in claim 3, characterized in that: The adjusting device further comprises an adjusting rod (501), a flap (502), a screw rod (503), a connecting plate (504), a spherical rod (505) and a suction cup (506). The connecting end of the adjusting rod (501) passes through the long slot (202) and is slidably connected to the support arm (305). The long slot (202) is provided with a threaded hole (507). The screw rod (503) passes through the threaded hole (507) and is threadedly connected to the support arm (305). 01), a groove (508) is provided on the flap (502), a connecting end of the flap (502) is rotatably connected to a connecting end of the groove (508), a connecting seat (509) is provided on the flap (502), a connecting plate (504) passes through the connecting seat (509) and is rotatably connected to the flap (502), a connecting end of the spherical rod (505) is connected to a connecting end of the connecting plate (504), and an output end of the spherical rod (505) is rotatably connected to a connecting end of the suction cup (506).

5. The adjustable car mobile phone holder as claimed in claim 4, characterized in that: The clamping mechanism further comprises a telescopic rod (601), a spring (602) and an end cover (603); a positioning hole (604) is provided through the connecting plate (504) and the flap (502); the telescopic rod (601) passes through the positioning hole (604) and is slidably connected to the connecting plate (504); the connecting end of the telescopic rod (601) and the connecting end of the flap (502) are movably clamped; the connecting ends of the multiple groups of springs (602) are respectively fixedly mounted on the multiple groups of connecting ends of the telescopic rod (601); and the connecting ends of the multiple groups of end covers (603) are respectively connected to the multiple groups of connecting ends of the telescopic rod (601).

6. The adjustable car mobile phone holder according to claim 5, characterized in that: The charging device also includes a tension spring (701), a frame (702), a pull rod (703), a positioning plate (704), a wireless charger (705), a cigarette lighter adapter plug (706), a wire (707) and a tie head (708); the connection end of the frame (702) is connected to the connection end of the support arm (305); the connection end of the cigarette lighter adapter plug (706) is connected to the connection end of the mounting block (1); the input end of the wire (707) passes through the through hole (203) and is electrically connected to the output end of the cigarette lighter adapter plug (706); the output end of the wire (707) is electrically connected to the input end of the wireless charger (705); The connection end of the charger (705) is connected to the connection end of the frame (702), and a plurality of groups of pin holes (709) are provided on the frame (702). The connection ends of the plurality of groups of pull rods (703) respectively pass through the corresponding pin holes (709) and are slidably connected to the frame (702). The plurality of groups of tension springs (701) are respectively fixedly mounted on the connection ends of the corresponding pull rods (703). The connection ends of the plurality of groups of positioning plates (704) are respectively connected to the connection ends of the corresponding pull rods (703). The connection end of the closing head (708) is connected to the connection end of the support arm (305), and the output end of the closing head (708) is fixedly mounted on the connection end of the wire (707).

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