Electromagnetic induction automobile gear shifting mechanism

Abstract

The utility model provides an electromagnetic induction automobile gear shifting mechanism, which relates to the technical field of automobile gear shifting and comprises a supporting seat, a gear shifting shell, a gear lever sleeve, a gear lever and a PCB (printed circuit board), the gear shifting shell is fixedly connected to the top of the supporting base. A movable cavity is formed in the gear shifting shell, and a linear gear shifting hole communicating with the movable cavity is formed in the top of the gear shifting shell; a tooth-shaped gear shifting groove is formed in the inner wall of the bottom of the gear shifting shell. The stop lever sleeve is rotationally connected to the gear shifting shell. The gear shifting rod is arranged in the gear rod sleeve in a penetrating mode. The lower portion of the gear shifting rod abuts against the tooth-shaped gear shifting groove through an elastic reset assembly. A rotating shaft is arranged on the stop lever sleeve; mounting grooves are formed in the outer ends of the rotating shafts; a magnetic block is arranged in the mounting groove; a rotating shaft matching through hole is formed in the gear shifting shell; the rotating shaft is inserted into the rotating shaft matching through hole; and the PCB is arranged on the gear shifting shell. The gear shifting mechanism has the advantages that through electromagnetic induction between the rotating position of the magnetic block and the PCB, the gear shifting rod shifts gears accurately, and gear shifting fluency and accuracy are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile shifting, in particular to an electromagnetic induction automobile shifting mechanism. Background Art

[0002] When the speed and gear of a car are not coordinated, the gear needs to be shifted, or when the car is parked or not started, the gear needs to be engaged. Therefore, the gear shifting mechanism is one of the mechanisms that must be used when the car is driving.

[0003] Existing automobile shift mechanisms all use mechanical shift structures, and the complex internal assembly parts can easily cause shift jams, unsmooth shifting or large shifting forces, and loud shifting noises, affecting the overall driving experience. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing shifting mechanism is prone to causing shifting jams, unsmooth switching and shifting noise. In order to overcome the defects of the above prior art, the utility model provides a method of changing the current shifter connected to the gearbox via a cable to provide a shifting signal to the gearbox through a magnet induction Hall to shift gears, installing the magnetic block on the gear lever cover and rotating synchronously with the gear lever cover, through the electromagnetic induction between the rotating position of the magnetic block and the PCB circuit board, so that the shift lever can shift accurately, improve the smoothness and accuracy of the shifting, and reduce the shifting noise.

[0005] For the purpose of this utility model, the following technical solutions are adopted:

[0006] An electromagnetic induction automobile shift mechanism comprises a support seat, a shift housing, a shift rod sleeve, a shift rod and a PCB circuit board; the shift housing is fixedly connected to the top of the support seat; an active cavity for the shift rod shifting activity is arranged in the shift housing, and a linear shift hole communicating with the active cavity is arranged on the top of the shift housing; a tooth-shaped shift groove is arranged on the bottom inner wall of the shift housing; the shift rod sleeve is connected to the shift housing in a forward and backward direction and is located in the active cavity; the shift rod is inserted into the shift rod sleeve, and the upper part of the shift rod passes through the linear shift hole; The lower part of the shift lever is pressed against the tooth-shaped shift groove through an elastic reset component; a horizontally protruding rotating shaft is arranged on one side outer wall of the shift lever sleeve in the left and right directions; a mounting groove is arranged on the outer end of the rotating shaft; a magnetic block is arranged in the mounting groove; a rotating shaft matching through hole is arranged on one side of the rotating shaft on the shift housing; the rotating shaft is inserted in the rotating shaft matching through hole, and the magnetic block is connected to the outside world; the PCB circuit board is arranged on the outer wall of the shift housing on one side of the rotating shaft, and different electrical signals are transmitted through the electromagnetic induction of the rotation of the magnetic block and the PCB circuit board. By changing the current shifter connected to the gearbox for shifting by a cable to providing a shift signal to the gearbox for shifting by a magnet induction Hall, the magnetic block is installed on the shift lever sleeve and rotates synchronously with the shift lever sleeve, and the electromagnetic induction between the position of the magnetic block rotation and the PCB circuit board is used to make the shift lever shift accurately, improve the smoothness and accuracy of the shift, and reduce the shift noise.

[0007] Preferably, a circular groove is provided on the outer wall of the shift lever sleeve at the outer circle of the rotating shaft; a circular tube is provided at the matching through hole of the rotating shaft, which is horizontally protruding and rotatably matched with the circular groove. The rotational match between the circular groove and the circular tube further facilitates the flexible and stable rotation of the shift lever, thereby improving the smoothness of the rotation.

[0008] Preferably, a rotational matching groove is provided on the side of the shift lever sleeve opposite to the rotating shaft; and a rotation column is provided on the inner wall of the shift housing opposite to the rotating shaft to rotationally match the rotational matching groove. The rotational matching between the rotational matching groove and the rotation column further facilitates the flexible and stable rotation of the shift lever, thereby improving the smoothness of the rotation.

[0009] Preferably, the shift housing includes a left housing, a right housing, a shift top plate and a shift bottom plate; the left housing and the right housing are fixedly connected to the left and right sides of the top of the support seat, and the left housing and the right housing are fixedly connected; the neutral position between the left housing and the right housing forms the active cavity; a neutral position connected to the active cavity is provided between the top of the left housing and the top of the right housing; the shift top plate is fixedly connected between the top of the left housing and the top of the right housing, and the linear shift hole is connected to the neutral position; the shift bottom plate is fixedly connected between the bottom of the left housing and the bottom of the right housing; the tooth-shaped shift groove is provided on the top surface of the shift bottom plate, and the tooth-shaped shift groove is provided corresponding to the upper and lower positions of the linear shift hole. By dividing the shift housing into four parts, it is convenient for disassembly and assembly as well as production, and it is also convenient for fixing to improve the stability and connectivity of the overall structure.

[0010] Preferably, at least one horizontally protruding plug is provided on both the left and right sides of the shift bottom plate; the inner walls of the left and right shells are provided with plug holes that match the plug, and the left and right shells are fixed together by a number of screws. The plug and the plug match to facilitate the assembly and disassembly of the shift bottom plate, and the screws further improve the connection stability and connection firmness.

[0011] Preferably, the shift lever comprises an outer rod, an inner rod and a shift spring; a lifting hole is provided at the center of the outer rod; the inner rod is connected to the lifting hole of the outer rod for lifting and movement, and the lower end of the inner rod passes through the outer rod; a spring cavity coaxial with the lifting hole is provided on the inner peripheral wall of the outer rod; and the aperture of the spring cavity is larger than the aperture of the lifting hole; a step is provided at the lower part of the inner rod; the shift spring is sleeved on the inner rod and located in the spring cavity; the lower end of the shift spring abuts on the step, and the upper end of the shift spring abuts on the top inner wall of the spring cavity. Through the action of the shift spring, the outer rod and the inner rod can be lifted to realize flexible lifting and lowering during use, prevent the shifting process from being relatively stiff, and improve the shifting feel and the shifting smoothness.

[0012] Preferably, the elastic reset assembly includes a connecting sleeve, a slide rod and a reset spring; the connecting sleeve is fixedly connected to the lower end of the inner rod, and the two side walls of the connecting sleeve are provided with lifting slide grooves; the top two sides of the slide rod are provided with sliders that slide with the lifting slide grooves, and the slide rod is connected to the connecting sleeve for lifting; the bottom of the slide rod is provided with a shift head, and a spring ring groove is provided between the shift head and the slide rod; the reset spring sleeve is provided on the slide rod, and the upper end of the reset spring is against the bottom surface of the connecting sleeve, and the lower end of the reset spring is against the bottom of the spring ring groove. The reset spring on the elastic reset assembly can realize the elastic lifting and retraction of the shift head, thereby preventing the shift head from being in flexible contact with the toothed shift groove, further ensuring that the shift head can move back and forth at the toothed shift groove, and improving the smoothness and feel of movement.

[0013] Preferably, a cable is further included; one end of the cable is hinged to the lower end of the blocking rod sleeve, the support seat is provided with a cable clamping hole, a cable limiting sleeve is fixedly clamped at the cable clamping hole; the other end of the cable passes through the cable limiting sleeve and can move back and forth in the cable limiting sleeve. The cable limiting sleeve is used to conveniently limit the cable, ensuring that the cable will not interfere with other parts when moving.

[0014] To sum up, the advantage of the utility model is that the magnetic block is installed on the gear lever cover and rotates synchronously with the gear lever cover. Through the electromagnetic induction between the rotating position of the magnetic block and the PCB circuit board, the gear lever can shift gears accurately, improving the smoothness and accuracy of the gear shifting, while reducing the gear shifting noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a schematic diagram of the structure of the electromagnetic induction automobile shifting mechanism.

[0016] Figure 2 This is the first exploded view of the electromagnetic induction automobile shifting mechanism of the utility model.

[0017] Figure 3 This is the first exploded view of the electromagnetic induction automobile shifting mechanism of the utility model.

[0018] Figure 4 It is a cross-sectional view of the electromagnetic induction automobile shifting mechanism of the utility model.

[0019] Figure 5 It is an exploded view of the elastic reset component in the utility model.

[0020] Description of reference numerals:

[0021] 1. Support seat; 2. Shift housing; 20. Active cavity; 201. Left housing; 202. Right housing; 203. Shift top plate; 204. Shift bottom plate; 205. Insertion column; 206. Insertion hole; 207. Screw; 21. Linear shift hole; 22. Toothed shift groove; 23. Rotating shaft matching through hole; 24. Round tube; 25. Rotating column; 3. Shift rod sleeve; 30. Rotating shaft; 301. Mounting groove; 31. Round groove; 32 , rotating matching groove; 4, shift lever; 41, outer rod; 411, lifting hole; 412, spring cavity; 42, inner rod; 421, step; 43, shift spring; 5, PCB circuit board; 6, elastic reset assembly; 61, connecting sleeve; 611, lifting slide groove; 62, slide rod; 621, slider; 63, reset spring; 64, shift head; 65, spring ring groove; 7, cable; 71, cable limit sleeve; 8, magnetic block. DETAILED DESCRIPTION

[0022] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0023] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0024] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 5 As shown, an electromagnetic induction automobile shift mechanism comprises a support seat 1, a shift housing 2, a shift rod cover 3, a shift rod 4 and a PCB circuit board 5; the shift housing 2 is fixedly connected to the top of the support seat 1; an active cavity 20 for the shift rod 4 to shift is provided in the shift housing 2, and a linear shift hole 21 connected to the active cavity 20 is provided on the top of the shift housing 2; a toothed shift groove 22 is provided on the bottom inner wall of the shift housing 2; the shift rod cover 3 is connected to the shift housing 2 in a forward and backward direction and is located in the active cavity 20; the shift rod 4 is inserted into the shift rod cover 3, and the upper part of the shift rod 4 is inserted into the gear shift hole 21; the gear shift hole 21 is connected to ... Through the straight shift hole 21; the lower part of the shift lever 4 is against the toothed shift groove 22 through the elastic reset component 6; a horizontally protruding rotating shaft 30 is provided on the right outer wall of the shift lever sleeve 3; a mounting groove 301 is provided at the outer end of the rotating shaft 30; a magnetic block 8 is provided in the mounting groove 301; a rotating shaft matching through hole 23 is provided on the right side of the shift housing 2; the rotating shaft 30 is inserted in the rotating shaft matching through hole 23, and the magnetic block 8 is connected with the outside; the PCB circuit board 5 is arranged on the outer wall on the right side of the shift housing 2, and different electrical signals are transmitted through the rotation of the magnetic block 8 and the electromagnetic induction cooperation with the PCB circuit board 5.

[0027] like Figures 1 to 3 As shown, a circular groove 31 is provided on the outer wall of the shift rod sleeve 3 at the outer ring of the rotating shaft 30; a circular tube 24 is provided at the rotating shaft matching through hole 23, which is horizontally protruding and rotatably matched with the circular groove 31. The rotational match between the circular groove 31 and the circular tube 24 further facilitates the flexible and stable rotation of the shift rod 4, and improves the smoothness of the rotation. A rotational match groove 32 is provided on the side of the shift rod sleeve 3 opposite to the rotating shaft 30; a rotating column 25 is provided on the inner wall on the left side of the shift housing 2, which rotatably matches with the rotational match groove 32. The rotational match between the rotational match groove 32 and the rotating column 25 further facilitates the flexible and stable rotation of the shift rod 4, and improves the smoothness of the rotation.

[0028] like Figures 1 to 3 As shown, the shift housing 2 includes a left shell 201, a right shell 202, a shift top plate 203 and a shift bottom plate 204; the left shell 201 and the right shell 202 are fixedly connected to the left and right sides of the top of the support seat 1, and the left shell 201 and the right shell 202 are fixedly connected; the neutral position between the left shell 201 and the right shell 202 forms an active cavity 20; an neutral position connected to the active cavity 20 is provided between the top of the left shell 201 and the top of the right shell 202; the shift top plate 203 is fixedly connected between the top of the left shell 201 and the top of the right shell 202, and the linear shift hole 21 is connected to the neutral position; the shift bottom plate 204 is fixedly connected between the bottom of the left shell 201 and the bottom of the right shell 202; the toothed shift groove 22 is provided on the top surface of the shift bottom plate 204, and the toothed shift groove 22 is provided corresponding to the upper and lower positions of the linear shift hole 21, and the PCB circuit board 5 is provided on the outer side wall of the right shell 202. By dividing the shift housing 2 into four parts, it is convenient for disassembly, assembly and production, and it is also convenient for fixing to improve the stability and connectivity of the overall structure. At least one horizontally protruding plug 205 is provided on the left and right sides of the shift bottom plate 204; the inner walls of the left shell 201 and the right shell 202 are provided with a plug hole 206 that matches the plug 205, and the left shell 201 and the right shell 202 are fixed together by a number of screws 207. Through the matching of the plug 205 and the plug hole 206, the shift bottom plate 204 can be easily assembled and fixed, improving the convenience of disassembly and assembly, and the connection stability and connection firmness are further improved by the screws 207.

[0029] like Figures 4 to 5As shown, the shift lever 4 includes an outer rod 41, an inner rod 42 and a shift spring 43; the outer rod 41 is provided with a lifting hole 411 through the center; the inner rod 42 is connected to the lifting hole 411 of the outer rod 41 for lifting and movement, and the lower end of the inner rod 42 passes through the outer rod 41; the inner peripheral wall of the outer rod 41 is provided with a spring cavity 412 coaxial with the lifting hole 411; and the aperture of the spring cavity 412 is larger than the aperture of the lifting hole 411; the lower part of the inner rod 42 is provided with a step 421; the shift spring 43 is sleeved on the inner rod 42 and located in the spring cavity 412; the lower end of the shift spring 43 abuts on the step 421, and the upper end of the shift spring 43 abuts on the top inner wall of the spring cavity 412. Through the action of the outer rod 41 and the inner rod 42, the shift lever 4 can be lifted to achieve flexible lifting during use, prevent the shifting process from being relatively stiff, and improve the shifting feel and the shifting smoothness.

[0030] like Figures 4 to 5 As shown, the elastic reset component 6 includes a connecting sleeve 61, a slide rod 62 and a reset spring 63; the connecting sleeve 61 is fixedly connected to the lower end of the inner rod 42, and the two side walls of the connecting sleeve 61 are provided with lifting slide grooves 611; sliding blocks 621 slidably matched with the lifting slide grooves 611 are provided on both sides of the top of the slide rod 62, and the slide rod 62 is lifted and connected to the connecting sleeve 61; a shift head 64 is provided at the bottom of the slide rod 62, and a spring ring groove 65 is provided between the shift head 64 and the slide rod 62; the reset spring 63 is sleeved on the slide rod 62, and the upper end of the reset spring 63 is against the bottom surface of the connecting sleeve 61, and the lower end of the reset spring 63 is against the bottom of the spring ring groove 65. The return spring 63 on the elastic return assembly 6 can realize the elastic extension and retraction of the shift head 64, thereby preventing the flexible contact between the shift head 64 and the toothed shift groove 22, further ensuring that the shift head 64 can move back and forth in the toothed shift groove 22, thereby improving the smoothness and feel of movement.

[0031] like Figures 1 to 3 As shown, the mechanism also includes a cable 7; one end of the cable 7 is hinged to the lower end of the blocking rod sleeve 3, the support seat 1 is provided with a cable clamping hole, and a cable limiting sleeve 71 is fixedly clamped at the cable clamping hole; the other end of the cable 7 passes through the cable limiting sleeve 71 and can move back and forth in the cable limiting sleeve 71. The cable limiting sleeve 71 is used to conveniently limit the cable 7, ensuring that the cable 7 will not interfere with other parts when moving.

[0032] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0033] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0034] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An electromagnetic induction automobile shift mechanism, characterized in that: The invention comprises a support seat (1), a shift housing (2), a shift rod sleeve (3), a shift rod (4) and a PCB circuit board (5); the shift housing (2) is fixedly connected to the top of the support seat (1); an active cavity (20) for the shift rod (4) to shift is arranged in the shift housing (2), and a linear shift hole (21) communicating with the active cavity (20) is arranged on the top of the shift housing (2); a tooth-shaped shift groove (22) is arranged on the inner wall of the bottom of the shift housing (2); the shift rod sleeve (3) is connected to the shift housing (2) in a forward and backward direction and is located in the active cavity (20); the shift rod (4) is inserted into the shift rod sleeve (3), and the upper part of the shift rod (4) passes through the linear shift hole (21); the shift rod (4) The lower part of the gear shift housing (2) is pressed against the toothed gear shift groove (22) through an elastic reset component (6); a horizontally protruding rotating shaft (30) is arranged on the outer wall of one side of the gear lever sleeve (3) in the left and right directions; a mounting groove (301) is arranged at the outer end of the rotating shaft (30); a magnetic block (8) is arranged in the mounting groove (301); a rotating shaft matching through hole (23) is arranged on the gear shift housing (2) on one side of the rotating shaft (30); the rotating shaft (30) is inserted into the rotating shaft matching through hole (23), and the magnetic block (8) is connected to the outside; the PCB circuit board (5) is arranged on the outer wall of the gear shift housing (2) on one side of the rotating shaft (30), and the magnetic block (8) rotates to cooperate with the PCB circuit board (5) in electromagnetic induction to transmit different electrical signals.

2. The electromagnetic induction automobile shift mechanism according to claim 1, characterized in that: A circular groove (31) is provided on the outer wall of the stop rod sleeve (3) at the outer ring of the rotating shaft (30); a circular tube (24) which protrudes horizontally and rotates with the circular groove (31) is provided at the rotating shaft matching through hole (23).

3. The electromagnetic induction automobile shift mechanism according to claim 2, characterized in that: A rotational matching groove (32) is provided on the shift rod sleeve (3) on the side opposite to the rotating shaft (30); and a rotation column (25) rotationally matching with the rotational matching groove (32) is provided on the inner wall of the shift housing (2) on the side opposite to the rotating shaft (30).

4. The electromagnetic induction automobile shift mechanism according to claim 1, characterized in that: The shift housing (2) comprises a left housing (201), a right housing (202), a shift top plate (203) and a shift bottom plate (204); the left housing (201) and the right housing (202) are fixedly connected to the left and right sides of the top of the support seat (1), and the left housing (201) and the right housing (202) are fixedly connected; the gap between the left housing (201) and the right housing (202) forms the active cavity (20); a space between the top of the left housing (201) and the top of the right housing (202) is provided to be in contact with the active cavity (20). The gear shift top plate (203) is fixedly connected between the top of the left housing (201) and the top of the right housing (202), and the linear gear shift hole (21) is connected to the neutral gear; the gear shift bottom plate (204) is fixedly connected between the bottom of the left housing (201) and the bottom of the right housing (202); the toothed gear shift groove (22) is arranged on the top surface of the gear shift bottom plate (204), and the toothed gear shift groove (22) and the linear gear shift hole (21) are arranged in a corresponding upper and lower position.

5. The electromagnetic induction automobile shift mechanism according to claim 4, characterized in that: At least one horizontally protruding plug post (205) is provided on both the left and right sides of the shift base plate (204); a plug hole (206) matching the plug post (205) is provided on the inner walls of the left shell (201) and the right shell (202), and the left shell (201) and the right shell (202) are fixedly connected together by a plurality of screws (207).

6. The electromagnetic induction automobile shift mechanism according to claim 1, characterized in that: The shift rod (4) comprises an outer rod (41), an inner rod (42) and a shift spring (43); a lifting hole (411) is provided at the center of the outer rod (41); the inner rod (42) is connected to the lifting hole (411) of the outer rod (41) for lifting and movement, and the lower end of the inner rod (42) passes through the outer rod (41); a spring cavity (412) coaxial with the lifting hole (411) is provided on the inner peripheral wall of the outer rod (41); and the aperture of the spring cavity (412) is larger than the aperture of the lifting hole (411); a step (421) is provided at the lower part of the inner rod (42); the shift spring (43) is sleeved on the inner rod (42) and located in the spring cavity (412); the lower end of the shift spring (43) abuts against the step (421), and the upper end of the shift spring (43) abuts against the top inner wall of the spring cavity (412).

7. The electromagnetic induction automobile shift mechanism according to claim 6, characterized in that: The elastic reset assembly (6) comprises a connecting sleeve (61), a sliding rod (62) and a reset spring (63); the connecting sleeve (61) is fixedly connected to the lower end of the inner rod (42), and the two side walls of the connecting sleeve (61) are provided with lifting and lowering grooves (611); sliding blocks (621) slidably matched with the lifting and lowering grooves (611) are provided on both sides of the top of the sliding rod (62), and the sliding rod (62) is connected to the connecting sleeve (61) in a lifting manner; a shift head (64) is provided at the bottom of the sliding rod (62), and a spring ring groove (65) is provided between the shift head (64) and the sliding rod (62); the reset spring (63) is sleeved on the sliding rod (62), and the upper end of the reset spring (63) abuts against the bottom surface of the connecting sleeve (61), and the lower end of the reset spring (63) abuts against the bottom of the spring ring groove (65).

8. The electromagnetic induction automobile shift mechanism according to claim 1, characterized in that: It also includes a cable (7); one end of the cable (7) is hinged to the lower end of the blocking rod sleeve (3); the support seat (1) is provided with a cable clamping hole extending therethrough; a cable limiting sleeve (71) is fixedly clamped at the cable clamping hole; the other end of the cable (7) passes through the cable limiting sleeve (71) and can move back and forth in the cable limiting sleeve (71).

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