Pull type touring car anti-swing device

Abstract

The utility model relates to the technical field of pull type motor homes, in particular to a pull type motor home anti-swing device which is characterized in that an anti-swing main part comprises a main shell, a cover plate used for sealing the main shell and a transmission mechanism arranged in an inner cavity of the main shell; the transmission mechanism comprises a circuit board provided with a tilt angle sensor, a motor electrically connected with the circuit board, a traction rod piece with the outer end connected with a braking pull wire of the motor home and moving along an inner cavity of the main shell in a sleeving mode, and a linkage piece formed by meshing of multiple stages of duplicate gears and used for converting rotation of the motor into sleeving of the traction rod piece. The connecting frame is used for fixing a shell structure composed of the main shell and the cover plate to a motor home underframe. The problems that a travel trailer anti-swing device is short in service life and difficult to intelligently and reliably achieve the anti-swing function are well solved.

Description

Technical Field

[0001] The utility model relates to the technical field of trailer-type caravans, in particular to an anti-sway device for trailer-type caravans. Background Art

[0002] As a "mobile home", RVs allow people to arrange their trips as they please and stop and go as they please. In the fast-paced life, more and more people like to travel and camp by towing RVs, away from the hustle and bustle of the city, and reconnect with nature.

[0003] Trailer RVs do not have their own driving force, and some existing trailer RVs have mechanical or electromagnetic brakes. In order to ensure stability and safety during driving, it is very important to equip the trailer RV with an anti-sway device.

[0004] At present, the mainstream anti-sway device for trailer RVs in the industry is a connector type, and its working principle is: using the small internal friction plate to rub the connecting ball head. Although the structure is relatively simple, the disadvantage is that it only relies on the small friction plate for braking, and its anti-sway strength is not good. It cannot effectively and intelligently cope with harsh working conditions. In addition, the friction plate of this device always rubs against the ball head, and its service life is short. In view of these problems of current products, it is urgent to propose an anti-sway device for trailer RVs. Utility Model Content

[0005] The utility model aims to provide an anti-sway device for a trailer-type caravan, which is used to solve the problems in the prior art that the anti-sway device for a trailer-type caravan has a short service life and is difficult to realize the anti-sway function intelligently and reliably.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a trailer-type RV anti-sway device, the anti-sway main component includes a main shell, a cover plate for closing the main shell and a transmission mechanism arranged in the inner cavity of the main shell, the transmission mechanism includes a circuit board with an inclination sensor, a motor electrically connected to the circuit board, a pulling rod whose outer end is connected to the brake cable of the RV and moves along the inner cavity of the main shell, and a linkage component composed of multi-stage gear meshing and used to convert the rotation of the motor into the movement of the pulling rod, and the connecting frame is used to fix the shell structure composed of the main shell and the cover plate to the RV chassis.

[0007] Preferably, the main shell includes a box body and a cylinder body integrally formed on the bottom surface of the box body and used to fit the motor, one side wall of the box body is provided with an axial hole slidably sleeved with the outer end of the pulling rod, and semicircular grooves are respectively provided on both sides of the inner cavity of the box body opposite to the axial hole, and the bottoms on both sides in the middle of the pulling rod are respectively slidably mounted in the corresponding semicircular grooves, and the upper sides of the semicircular grooves are respectively fixed with guide frames slidably engaged with the tops on both sides in the middle of the pulling rod using screws.

[0008] Preferably, the linkage part includes a double gear one, a double gear two, a double gear three and a double gear four that are meshed in sequence, the power output shaft of the motor is fixedly sleeved with a driving gear that meshes with the double gear one, and a rack that meshes with the double gear four is provided in the middle position of the pulling rod.

[0009] Preferably, the pulling rod also includes a pull rod and a guide rod respectively fixedly connected to the outer end and inner end of the rack, and the pull rod and the guide rod are respectively slidably mounted in the cylindrical cavity composed of the semicircular groove and the guide frame, the pull rod is slidably sleeved with the shaft hole, and the outer end of the pull rod is connected to the brake cable of the RV.

[0010] Preferably, the inner end of the guide rod is sleeved with a detection frame, the detection frame is provided with a column cavity corresponding to the end surface of the circuit board, a magnetic column is sleeved in the column cavity, and an induction sensor for detecting the moving position of the magnetic column is provided on the circuit board.

[0011] Preferably, a buffer pad and a gasket are mounted on the inner end of the guide rod near the detection frame, and the gasket is located on both sides of the buffer pad.

[0012] Preferably, the holes in the circuit board are provided with copper sleeves that are rotatably sleeved with the bottom of the center shafts of the double gears one, two, three and four, the bottom surface of the cover plate is provided with an axis cavity one corresponding to the position of the center shaft of the double gear four, the bottom surface of the cover plate is provided with an axis cavity two corresponding to the positions of the double gears one, two and three, the axis cavity one is provided with a bearing that is rotatably sleeved with the top of the center shaft of the double gear four, the axis cavity two is provided with an oil-free bushing that is rotatably sleeved with the top of the center shaft of the double gear one, two and three, a bracket is fixed with screws on the bottom surface of the inner cavity of the box body corresponding to the position of the cylinder, a through hole is provided in the middle part of the bracket corresponding to the position of the driving gear, the top surface of the bracket is provided with an axis cavity three corresponding to the position of the double gear one, and the axis cavity three is provided with an oil-free sleeve that is rotatably sleeved with the bottom end of the double gear one.

[0013] Preferably, a USB interface and a waterproof connector are provided on the bottom surface of the box body, and an oil seal is installed between the shaft hole and the pull rod.

[0014] Preferably, the connecting frame includes a groove-shaped part, a bolt that matches the RV frame and a locking nut that is threadedly mounted on the outer end of the bolt. A sleeve hole that matches the bolt is provided at the center of the side plate of the groove-shaped part. The outer ends of the middle parts of the upper and lower plates of the groove-shaped part are respectively provided with card slots, and the shell structure composed of the main shell and the cover plate is fixedly mounted in the card slots.

[0015] Preferably, it also includes a brake cable plate, which is slidably mounted in the inner cavity of the groove-shaped part, and the two ends of the brake cable plate are respectively connected to the brake cables of the wheels on both sides of the RV, and the middle part of the brake cable plate is provided with a second sleeve hole that matches the outer end of the pulling rod.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model relates to an anti-sway device for a trailer-type RV, which monitors the sway angle of the RV in real time through an inclination sensor arranged on a circuit board. When the sway angle is too large, the motor and the linkage part drive the pulling rod to move in time, and the pulling rod pulls the brake cable at the wheel of the RV to brake the RV, so as to slow down the swaying RV, thereby ensuring driving safety and making the anti-sway function of the device intelligent and flexible.

[0018] 2. The utility model relates to an anti-sway device for a trailer-type RV, in which a motor drives a pulling rod to move through a linkage, and the linkage is composed of a multi-stage gear meshing. The multi-stage gears reduce speed and increase torque to further ensure the reliability of the anti-sway function. When the RV runs smoothly, the pulling rod can be reset in time, so that the braking structure does not need to be in working condition all the time, and the device has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the exploded structure of the anti-sway main component of the utility model;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the cover plate of the utility model;

[0022] Figure 4 This is a schematic diagram of the exploded structure of the main housing of the utility model;

[0023] Figure 5 It is a schematic diagram of the exploded structure of the transmission mechanism of the utility model;

[0024] Figure 6 This is a schematic diagram of the exploded structure of the detection frame of the utility model;

[0025] Figure 7 This is a schematic diagram of the exploded structure of the bracket of the utility model;

[0026] Figure 8 This is a schematic diagram of the exploded structure of the connecting frame of the utility model;

[0027] Fig. 9 It is a three-dimensional structural schematic diagram of the brake cable plate of the utility model.

[0028] In the figure: 1-anti-sway main part; 1.1-cover plate; 1.1.1-shaft cavity 1; 1.1.2-shaft cavity 2; 1.1.3-bearing; 1.1.4-oil-free bushing;

[0029] 1.2-main housing; 1.2.1-box body; 1.2.1.1-shaft hole; 1.2.1.2-semicircular slot; 1.2.2-cylinder body; 1.2.3-oil seal; 1.2.4-waterproof connector; 1.2.5-USB interface;

[0030] 1.3-transmission mechanism; 1.3.1-circuit board; 1.3.2-double gear one; 1.3.3-double gear two; 1.3.4-double gear three; 1.3.5-double gear four; 1.3.6-pull rod; 1.3.6.1-rack; 1.3.6.2-pull rod; 1.3.6.3-guide rod; 1.3.7-motor; 1.3.7.1-driving gear; 1.3.8-bracket; 1.3.8.1-perforation; 1.3.8.2-shaft cavity three; 1.3.8.3-oil-free shaft sleeve; 1.3.9-guide frame; 1.3.10-gasket; 1.3.11-buffer pad; 1.3.12-detection frame; 1.3.12.1-column cavity; 1.3.13-copper sleeve; 1.3.14-magnetic column;

[0031] 1.4- Sealing strip;

[0032] 2-connecting frame; 2.1-groove-shaped part; 2.1.1-hole 1; 2.1.2-slot; 2.2-bolt; 2.3-locking nut;

[0033] 3-brake cable plate; 3.1-hole two. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] See also Figure 1-9 The utility model provides a technical solution, a trailer caravan anti-sway device, the anti-sway main component 1 includes a main shell 1.2, a cover plate 1.1 for closing the main shell 1.2 and a transmission mechanism 1.3 arranged in the inner cavity of the main shell 1.2.

[0036] The main housing 1.2 includes a box body 1.2.1 and a cylinder 1.2.2 integrally formed on the bottom surface of the box body 1.2.1. A shaft hole 1.2.1.1 is provided on one side wall of the box body 1.2.1. Semicircular slots 1.2.1.2 are provided on both sides of the inner cavity of the box body 1.2.1 at positions corresponding to the shaft hole 1.2.1.1. A USB interface 1.2.5 and a waterproof connector 1.2.4 are provided on the bottom surface of the box body 1.2.1. The USB interface 1.2.5 is dustproof and waterproof, which can prevent components from being damaged in a harsh working environment such as the bottom of a motorhome. The USB interface 1.2.5 can be connected to an external device to optimize and upgrade the internal system, and the waterproof connector 1.2.4 is used to set the power supply cable.

[0037] The outer edge of the cover plate 1.1 is sutured and connected to the opening of the box body 1.2.1 by screws. A shaft cavity 1.1.1 is provided in the middle of the bottom surface of the cover plate 1.2, and multiple shaft cavities 1.1.2 are provided at the periphery of the shaft cavity 1.1.1. A bearing 1.1.3 is set in the shaft cavity 1.1.1, and an oil-free bushing 1.1.4 is set in the shaft cavity 1.1.2.

[0038] The cover plate 1.1 and the main shell 1.2 can be made of iron, aluminum or other composite materials.

[0039] The transmission mechanism 1.3 includes a circuit board 1.3.1 provided with an inclination sensor, a motor 1.3.7 electrically connected to the circuit board 1.3.1, a pulling rod 1.3.6 whose outer end is connected to the brake cable of the RV and moves along the inner cavity of the main shell 1.2, and a linkage composed of multi-stage double gear meshing and used to convert the rotation of the motor 1.3.7 into the movement of the pulling rod 1.3.6.

[0040] Among them, the linkage parts include the double gear 1 1.3.2, double gear 2 1.3.3, double gear 3 1.3.4 and double gear 4 1.3.5 meshed in sequence, the power output shaft of the motor 1.3.7 set in the cylinder 1.2.2 is fixed with a driving gear 1.3.7.1 meshed with the double gear 1 1.3.2, and the middle position of the pulling rod 1.3.6 is provided with a rack 1.3.6.1 meshed with the double gear 4 1.3.5. The double gear 1 1.3.2 and the double gear 2 1.3.3 are made of POM; the double gear 3 1.3.4 is a 45# steel gear pressed with POM material; the double gear 4 1.3.5 and the rack 1.3.6.1 are made of 45# steel. In addition, the transmission form of the linkage parts and the rack 1.3.6.1 can also be replaced by other transmission forms, such as worm gears, ball screws, etc.

[0041] A copper sleeve 1.3.13 is installed in the hole of the circuit board 1.3.1, which is matched with the bottom rotating sleeve of the central shaft of the double gear 1 1.3.2, the double gear 2 1.3.3, the double gear 3 1.3.4 and the double gear 4 1.3.5. The top of the central shaft of the double gear 4 1.3.5 is rotated and installed in the bearing 1.1.3, and the top of the central shaft of the double gear 1 1.3.2, the double gear 2 1.3.3 and the double gear 3 1.3.4 is rotated and installed in the oil-free bushing 1.1.4 respectively.

[0042] A bracket 1.3.8 is fixed with screws at the bottom surface of the inner cavity of the box body 1.2.1 corresponding to the position of the cylinder body 1.2.2, a through hole 1.3.8.1 is provided in the middle of the bracket 1.3.8 corresponding to the position of the driving gear 1.3.7.1, and an axis cavity three 1.3.8.2 is provided on the top surface of the bracket 1.3.8 corresponding to the position of the duplex gear one 1.3.2, and an oil-free shaft sleeve 1.3.8.3 is installed in the axis cavity three 1.3.8.2 and matches the bottom end rotation sleeve of the duplex gear one 1.3.2.

[0043] The upper side of the semicircular slot 1.2.1.2 is fixed with screws to guide frames 1.3.9 that are slidably engaged with the tops of the middle two sides of the pulling rod 1.3.6. The pulling rod 1.3.6 also includes a pull rod 1.3.6.2 and a guide rod 1.3.6.3 that are fixedly connected to the outer end and the inner end of the rack 1.3.6.1, respectively. The pull rod 1.3.6.2 and the guide rod 1.3.6.3 are respectively slidably mounted in the cylindrical cavity formed by the semicircular slot 1.2.1.2 and the guide frame 1.3.9, and the pull rod 1.3.6.2 is slidably engaged with the shaft hole 1.2.1.1. An oil seal 1.2.3 is mounted between the shaft hole 1.2.1.1 and the pull rod 1.3.6.2.

[0044] The connecting frame 2 includes a groove part 2.1, a bolt 2.2 that is sleeved and matched with the RV chassis, and a locking nut 2.3 that is threadedly sleeved on the outer end of the bolt 2.2. A sleeve hole 2.1.1 that is sleeved and matched with the bolt 2.2 is provided at the center of the side plate of the groove part 2.1. The outer ends of the middle of the upper and lower plates of the groove part 2.1 are respectively provided with card slots 2.1.2. The shell structure composed of the main shell 1.2 and the cover plate 1.1 is fixedly mounted in the card slot 2.1.2.

[0045] The brake cable plate 3 is slidably mounted in the inner cavity of the grooved part 2.1. The two ends of the brake cable plate 3 are respectively connected to the brake cables of the wheels on both sides of the RV. The middle part of the brake cable plate 3 is provided with a sleeve hole 2 3.1 which is sleeved and matched with the outer end of the pulling rod 1.3.6.

[0046] The inner end of the guide rod 1.3.6.3 is sleeved with a detection frame 1.3.12, and the detection frame 1.3.12 is provided with a column cavity 1.3.12.1 corresponding to the end surface of the circuit board 1.3.1, and a magnetic column 1.3.14 is sleeved in the column cavity 1.3.12.1. The circuit board 1.3.1 is provided with an induction sensor for detecting the moving position of the magnetic column 1.3.14. The inner end of the guide rod 1.3.6.3 near the detection frame 1.3.12 is sleeved with a buffer pad 1.3.11 and a gasket 1.3.10, and the gasket 1.3.10 is located on both sides of the buffer pad 1.3.11.

[0047] In summary, the inclination sensor provided on the circuit board 1.3.1 is used to monitor the swing angle of the RV chassis in real time. When the swing angle reaches the set working value, the control module on the circuit board 1.3.1 starts the motor 1.3.7, and the motor 1.3.7 sequentially meshes and drives the double gear 1 1.3.2, double gear 2 1.3.3, double gear 3 1.3.4 and double gear 4 1.3.5 through the driving gear 1.3.7.1. The double gear 4 1.3.5 drives the pulling rod 1.3.6 to move as a whole through the rack 1.3.6.1, wherein the pulling rod 1.3.6.2 pulls the brake cables of the wheels on both sides of the RV through the brake cable plate 3, so that the RV brakes and decelerates to ensure the driving safety of the RV.

[0048] When the RV tends to run smoothly, the motor 1.3.7 reverses to reset the pulling rod 1.3.6. The buffer pad 1.3.11 can play a buffering role when the pulling rod 1.3.6 moves horizontally. The inductive sensor on the circuit board 1.3.1 detects the magnetic column 1.3.14 to determine the moving stroke of the pulling rod 1.3.6, so as to accurately control the opening, closing and forward and reverse rotation of the motor 1.3.7.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A trailer RV anti-sway device, characterized in that: include: An anti-sway main component (1), the anti-sway main component (1) comprising a main shell (1.2), a cover plate (1.1) for closing the main shell (1.2), and a transmission mechanism (1.3) arranged in the inner cavity of the main shell (1.2), the transmission mechanism (1.3) comprising a circuit board (1.3.1) provided with an inclination sensor, a motor (1.3.7) electrically connected to the circuit board (1.3.1), a pulling rod (1.3.6) whose outer end is connected to a brake cable of a motorhome and moves along the inner cavity of the main shell (1.2), and a linkage component composed of multi-stage meshing gears and used for converting the rotation of the motor (1.3.7) into the movement of the pulling rod (1.3.6); A connecting frame (2), the connecting frame (2) being used to fix the shell structure composed of the main shell (1.2) and the cover plate (1.1) on the motorhome chassis.

2. The anti-sway device for a trailer caravan according to claim 1, characterized in that: The main housing (1.2) comprises a box body (1.2.1) and a cylinder (1.2.2) integrally formed on the bottom surface of the box body (1.2.1) and used to fit the motor (1.3.7); a side wall of the box body (1.2.1) is provided with an axial hole (1.2.1.1) slidably sleeved with the outer end of the pulling rod (1.3.6); semicircular grooves (1.2.1.2) are respectively provided at positions on both sides of the inner cavity of the box body (1.2.1) corresponding to the axial hole (1.2.1.1); the bottoms on both sides of the middle of the pulling rod (1.3.6) are respectively slidably mounted in the corresponding semicircular grooves (1.2.1.2); and the upper sides of the semicircular grooves (1.2.1.2) are respectively fixed with guide frames (1.3.9) slidably sleeved with the tops on both sides of the middle of the pulling rod (1.3.6) by screws.

3. The anti-sway device for a trailer caravan according to claim 2, characterized in that: The linkage member comprises a double gear one (1.3.2), a double gear two (1.3.3), a double gear three (1.3.4) and a double gear four (1.3.5) which are meshed in sequence; the power output shaft of the motor (1.3.7) is fixedly sleeved with a driving gear (1.3.7.1) which is meshed with the double gear one (1.3.2); and a rack (1.3.6.1) which is meshed with the double gear four (1.3.5) is provided at a middle position of the pulling rod (1.3.6).

4. The anti-sway device for a trailer caravan according to claim 3, characterized in that: The pulling rod (1.3.6) also includes a pull rod (1.3.6.2) and a guide rod (1.3.6.3) which are respectively fixedly connected to the outer end and the inner end of the rack (1.3.6.1); the pull rod (1.3.6.2) and the guide rod (1.3.6.3) are respectively slidably mounted in a cylindrical cavity formed by the semicircular groove (1.2.1.2) and the guide frame (1.3.9); the pull rod (1.3.6.2) is slidably mounted on the shaft hole (1.2.1.1); and the outer end of the pull rod (1.3.6.2) is connected to the brake cable of the RV.

5. The anti-sway device for a trailer caravan according to claim 4, characterized in that: The inner end of the guide rod (1.3.6.3) is sleeved with a detection frame (1.3.12); the detection frame (1.3.12) is provided with a column cavity (1.3.12.1) corresponding to the end surface of the circuit board (1.3.1); a magnetic column (1.3.14) is sleeved in the column cavity (1.3.12.1); and an induction sensor for detecting the moving position of the magnetic column (1.3.14) is provided on the circuit board (1.3.1).

6. The anti-sway device for a trailer caravan according to claim 5, characterized in that: A buffer pad (1.3.11) and a gasket (1.3.10) are mounted on the inner end of the guide rod (1.3.6.3) near the detection frame (1.3.12), and the gasket (1.3.10) is located on both sides of the buffer pad (1.3.11).

7. The anti-sway device for a trailer caravan according to claim 3, characterized in that: A copper sleeve (1.3.13) is mounted in the hole of the circuit board (1.3.1) and is rotatably sleeved and matched with the bottom of the central shafts of the double gear one (1.3.2), the double gear two (1.3.3), the double gear three (1.3.4) and the double gear four (1.3.5). The bottom surface of the cover plate (1.1) is provided with an axis cavity one ( 1.1.1), the bottom surface of the cover plate (1.1) is provided with shaft cavities (1.1.2) at positions corresponding to the duplex gear one (1.3.2), the duplex gear two (1.3.3), and the duplex gear three (1.3.4), respectively, and the shaft cavity (1.1.1) is provided with a bearing (1.1.2) which is rotatably sleeved and matched with the top end of the central shaft of the duplex gear four (1.3.5). 1.1.3), the shaft cavity two (1.1.2) is respectively provided with oil-free bushings (1.1.4) which are rotatably sleeved and matched with the top ends of the central shafts of the duplex gear one (1.3.2), the duplex gear two (1.3.3) and the duplex gear three (1.3.4), a bracket (1.3.8) is fixed by screws on the bottom surface of the inner cavity of the box body (1.2.1) at a position corresponding to the cylinder body (1.2.2), a through hole (1.3.8.1) is provided in the middle part of the bracket (1.3.8) at a position corresponding to the driving gear (1.3.7.1), the top surface of the bracket (1.3.8) is provided with a shaft cavity three (1.3.8.2) at a position corresponding to the duplex gear one (1.3.2), and the shaft cavity three (1.3.8.2) is provided with an oil-free shaft sleeve (1.3.8.3) which is rotatably sleeved and matched with the bottom end of the duplex gear one (1.3.2).

8. The anti-sway device for a trailer caravan according to claim 4, characterized in that: The bottom surface of the box body (1.2.1) is provided with a USB interface (1.2.5) and a waterproof connector (1.2.4), and an oil seal (1.2.3) is sleeved between the shaft hole (1.2.1.1) and the pull rod (1.3.6.2).

9. The anti-sway device for a trailer caravan according to claim 1, characterized in that: The connecting frame (2) comprises a grooved part (2.1), a bolt (2.2) sleeved and matched with the motorhome chassis, and a locking nut (2.3) threadedly sleeved on the outer end of the bolt (2.2); a sleeve hole (2.1.1) sleeved and matched with the bolt (2.2) is provided at the center of a side plate of the grooved part (2.1); the outer ends of the middle parts of the upper and lower plates of the grooved part (2.1) are respectively provided with clamping grooves (2.1.2); and the housing structure composed of the main housing (1.2) and the cover plate (1.1) is fixedly clamped in the clamping grooves (2.1.2).

10. The anti-sway device for a trailer caravan according to claim 9, characterized in that: It also includes a brake cable plate (3), which is slidably mounted in the inner cavity of the groove-shaped member (2.1), and the two ends of the brake cable plate (3) are respectively connected to the brake cables of the wheels on both sides of the motorhome, and the middle part of the brake cable plate (3) is provided with a second sleeve hole (3.1) that is sleeved and matched with the outer end of the pulling rod (1.3.6).

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