CN112977598A

CN112977598A - Automobile steering device with adjustable gear engagement degree

Info

Publication number: CN112977598A
Application number: CN202110272085.9A
Authority: CN
Inventors: 杨国斌; 张金萍
Original assignee: Guangdong Star Auto Parts Technology Co ltd
Current assignee: Guangdong Star Auto Parts Technology Co ltd
Priority date: 2021-03-12
Filing date: 2021-03-12
Publication date: 2021-06-18
Anticipated expiration: 2041-03-12
Also published as: CN112977598B

Abstract

The invention discloses an automobile steering gear with adjustable gear engagement degree, and relates to the technical field of automobile steering gears. The swinging piece comprises a swinging piece, telescopic rod pieces, an external connecting rod, swinging teeth and a sliding piece, wherein one side of the swinging piece is fixedly connected with a spring column piece, the other side of the swinging piece is fixedly connected with the external connecting rod, the bottom of the swinging piece is fixedly connected with the sliding piece, and the rear side of the swinging piece is positioned at two sides and is fixedly connected with the telescopic rod pieces. According to the automobile steering device, the telescopic rod pieces are fixedly connected to the two sides of the rear part of the swing piece, the sliding piece is connected to the bottom of the swing piece in a sliding mode, the spring column piece, the telescopic rod pieces, the external connecting rod and the sliding piece are fixedly connected with the swing piece through the external bolts, and the bottom of the sliding piece is meshed with the fixed swing teeth of the shell component through the external bolts, so that the problems that the existing automobile steering device is used for a long time, the meshing degree of the connecting plate and the steering nut is reduced, the inner parts of the automobile steering device are inclined to work, and the automobile steering device is inconvenient to disassemble and maintain.

Description

Automobile steering device with adjustable gear engagement degree

Technical Field

The invention belongs to the technical field of automobile steering gears, and particularly relates to an automobile steering gear with an adjustable gear meshing degree.

Background

The steering gear, also known as steering gear and steering gear, is the most important part in the steering system of automobile and mainly has the functions of increasing the force transmitted from the steering wheel to the steering transmission mechanism and changing the transmission direction of the force.

For the automobile steering gear capable of preventing the gear from loosening, which is proposed by the prior publication CN209115650U, the top end of the disclosed connecting plate is provided with the saw teeth, and the inner wall of the connecting plate is provided with the reinforcing plate, so that the strength of the connecting plate can be ensured, the abrasion can be reduced, and the engagement loosening between the connecting plate and the connecting plate can be prevented.

Meanwhile, the automobile steering gears on the market at present are mainly of a rack and pinion type, a worm crank pin type and a circulating ball type, and the automobile steering gears of the above types can bring better driving experience to drivers, but the automobile steering gears still have the following defects in actual use:

1. when the existing automobile steering gear is used on an automobile with poor anti-seismic effect for a long time, the situation of inclined operation is easy to occur on parts in the automobile steering gear, so that the automobile steering gear fails in use, and great danger exists;

2. aiming at the condition that roads in China are increasingly worsened, the mounting mode of the internal components of the existing automobile steering gear cannot meet the actual requirements, and once the internal components of the automobile steering gear are damaged, the situation that a user cannot conveniently detach and maintain the internal components is existed, so that the improvement is needed.

Therefore, the existing automobile steering device cannot meet the requirement in practical use, so that the improved technology is urgently needed in the market to solve the problems.

Disclosure of Invention

The invention aims to provide an automobile steering gear with adjustable gear meshing degree, wherein telescopic rod pieces are fixedly connected to the two sides of the rear part of a swing piece, a sliding piece is connected to the bottom of the swing piece in a sliding mode, a spring column piece, the telescopic rod pieces, an external connecting rod and the sliding piece are fixedly connected with the swing piece through external bolts, and the bottom of the sliding piece is meshed with a fixed swing tooth of a shell component through the external bolts on the swing piece.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to an automobile steering gear with adjustable gear engagement, which comprises a swing part, a telescopic rod piece, an external connecting rod, a swing tooth and a sliding part, wherein one side of the swing part is fixedly connected with a spring column piece, the other side of the swing part is fixedly connected with the external connecting rod, the bottom of the swing part is fixedly connected with the sliding part, the rear side of the swing part is positioned at two sides and is fixedly connected with the telescopic rod piece, the front side of the swing part is engaged with the swing tooth, the bottom of the sliding part is fixedly connected with the bottom of the inner side wall of an outer shell component, the telescopic rod piece comprises a base, a telescopic rod body and a support ring, the base is fixedly connected with the rear end of the telescopic rod body, the support ring is fixedly connected with the front end of the telescopic rod body, as the swing part and the swing tooth can generate abrasion in long-time matching work, the arrangement of the telescopic, and then guarantee goods of furniture for display rather than for use and pendulum tooth spare steady operation, the pendulum tooth includes tooth spare, connecting hole, lower tooth spare and tooth mouth, tooth spare fixed connection is in the bottom of last tooth spare down, the connecting hole runs through to be seted up on last tooth spare and tooth spare down, the tooth mouth is seted up at the front side of last tooth spare under with, the slider includes slider spare, spout, base and bedplate, slider spare sliding connection is close to both ends position in the inside of spout, the lower part of slider spare runs through the spout and fixes with the top of base, the bottom of base is fixed with the top of bedplate, the bedplate is located the bottom through the inside of external bolt fastening at the casing.

Further, the tooth mouth is with the rear portion intermeshing of goods of furniture for display rather than for use, go up and have the clearance between the bottom of tooth spare and the goods of furniture for display rather than for use, can reduce the frictional force between pendulum tooth and the goods of furniture for display rather than for use, and then realize stabilizing the cooperation work between pendulum tooth and the goods of furniture for display rather than for use.

Further, slider spare includes slider body, pulley and cylindricality pole, the equidistant rotation of pulley is connected and is located front and back both sides position at slider body's top and bottom, cylindricality pole fixed connection is located the middle part at slider body's bottom, the bottom mounting of cylindricality pole is at the top of base, has the clearance around slider body between the inside wall in lateral wall and the smooth chamber, can realize that the goods of furniture for display rather than for use can slide around the in-process of work, and then realize the goods of furniture for display rather than for use under the drive of flexible member correct and the interlock degree between the pendulum tooth.

Further, the spout includes frid, smooth chamber and slide, frid fixed connection is at the top in smooth chamber, the equal fixedly connected with slide in lower part of inside wall around the bottom of frid and the smooth chamber.

Further, the slide is mutually supported with the pulley, the frid passes through external bolt fixed connection in the bottom of goods of furniture for display rather than for use, can realize the in-process of spout and goods of furniture for display rather than for use cooperation work, and the goods of furniture for display rather than for use is along the slip direction work of spout and slider spare, and then avoids the long-time during operation of goods of furniture for display rather than for use the condition of slope work to appear.

Further, the spring column piece comprises a spring seat, an output rod and a fixing ring, the fixing ring is sleeved on the output rod and is fixedly connected to the spring seat, the fixing ring is fixed to the swing part through an external bolt, and the tail end of the spring seat is clamped inside the fixing seat.

Further, the external connecting rod comprises a ferrule and a connecting rod, the ferrule is sleeved on the connecting rod and fixed on the swing part through an external bolt, and one end of the connecting rod, which is far away from the ferrule, is connected with external equipment.

Further, shell subassembly includes fixing base, casing, clamping ring, spliced pole, fixed column and bearing, fixing base fixed connection is located one side position in the inside of casing, clamping ring fixed connection is in the inside and the fixing base relative position of casing, the bottom fixed connection of bearing is located the front side position at middle part in the bottom of casing inside wall, it is connected with the fixed column to rotate on the bearing, the top fixedly connected with spliced pole of fixed column, the inside wall diameter of clamping ring are greater than the lateral wall diameter of extension pole, and the inside wall diameter of fixing base is greater than the lateral wall diameter of spring column spare, and then can guarantee that when goods of furniture for furniture and be connected, slight displacement can take place flexible.

Furthermore, the connecting ring is sleeved on the external connecting rod, the connecting column is inserted into the connecting hole, the top end of the connecting column is connected with external equipment, and the top end of the fixing column is abutted to the bottom of the lower tooth piece.

The invention has the following beneficial effects:

1. the rear part of the swing part is fixedly connected with the telescopic rod pieces at the two sides, when the device is used, a worker fixes the output end of the telescopic rod piece on the swing part through the external bolt, then the fixed end of the telescopic rod piece is fixed with the shell component through the external bolt, and further the installation of the telescopic rod piece can be realized.

2. The bottom of the swing part is connected with the sliding part in a sliding mode, the sliding groove is fixedly connected with the swing part, the sliding block part is connected to the sliding groove in a sliding mode, the bottom of the sliding block part is fixedly connected with the base, and the base is fixedly connected with the shell component, so that the swing part can slide along the sliding block part when the automobile steering device is used, the situation that the swing part works obliquely when the swing part works for a long time is avoided, the service life of the automobile steering device can be prolonged, the working stability of the automobile steering device is improved, and the problem that the existing automobile steering device is used for a long time and the parts in the automobile steering device work obliquely is.

3. The spring column piece, the telescopic rod piece, the external connecting rod and the sliding piece are fixedly connected with the swinging piece through the external bolts, and the bottom of the sliding piece is meshed with the fixed swinging teeth of the shell component through the external bolts and the swinging teeth, so that when parts in the automobile are damaged, workers can conveniently detach and maintain the automobile steering device, the maintenance time of the automobile steering device is shortened, meanwhile, the connection stability of all parts can be improved by connecting the parts through the bolts, the condition that the parts are loosened during the driving process of the automobile is avoided, and the problems that the existing automobile steering device is inconvenient to detach and maintain for a long time and a user can not conveniently detach and maintain the automobile steering device are solved.

4. When the swing piece is used, the swing piece and the swing tooth are meshed in two sections, so that the meshing degree between the swing piece and the swing tooth can be increased, the working stability between the swing piece and the swing tooth can be improved, and the stable work of the swing piece and the swing tooth is realized.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the housing assembly of the present invention;

FIG. 3 is a diagram of the spring post, telescoping rod, extension rod, slider, and coupling of the swing tooth and swing portion of the present invention;

FIG. 4 is a schematic view of the connection structure of the spring post, the telescopic rod, the extension rod, the swing tooth and the swing member according to the present invention;

FIG. 5 is a schematic view of the structure of the sliding member of the present invention;

FIG. 6 is a schematic view of the structure of the chute of the present invention;

fig. 7 is a schematic structural view of the slider member of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a spring post; 11. a spring seat; 12. an output rod; 13. a stationary ring; 2. a decoration piece; 3. a telescopic rod member; 31. a base; 32. the telescopic rod body; 33. abutting against the ring; 4. an extension rod; 41. a ferrule; 42. a connecting rod; 5. swinging the teeth; 51. an upper tooth member; 52. connecting holes; 53. a lower tooth member; 54. a tooth mouth; 6. a housing assembly; 61. a fixed seat; 62. a housing; 63. a connecting ring; 64. connecting columns; 65. fixing a column; 66. a bearing; 7. a slider; 71. a slider member; 711. a slider body; 712. a pulley; 713. a cylindrical rod; 72. a chute; 721. a groove plate; 722. a slide chamber; 723. a slideway; 73. a base; 74. a seat board.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-7, the invention relates to an automobile steering gear with adjustable gear engagement, which comprises a swing part 2, a telescopic rod 3, an external connecting rod 4, a swing tooth 5 and a sliding part 7, wherein one side of the swing part 2 is fixedly connected with a spring column 1, the other side of the swing part 2 is fixedly connected with the external connecting rod 4, the bottom of the swing part 2 is fixedly connected with the sliding part 7, the rear side of the swing part 2 is fixedly connected with the telescopic rod 3 at two sides, the front side of the swing part 2 is engaged with the swing tooth 5, and the bottom of the sliding part 7 is fixedly connected with the bottom of the inner side wall of a shell component 6. in the automobile steering gear, when in use, the spring column 1 is arranged, so that when the swing part 2 is displaced, the swing part 2 is reset by matching with the swing tooth 5, and when the telescopic rod 3 is arranged, the swing part 2 and the swing tooth 5 are matched to work for a long, at this time, the rear portion of the swing portion 2 is fixedly connected with the telescopic rod 3, so that the telescopic rod 3 can generate certain thrust to the swing portion 2, and further the engagement degree between the swing portion 2 and the swing teeth 5 is increased, the slider 7 can be arranged, so that the swing portion 2 can be displaced along the two side directions of the slider 7 in the working process, and further the situation that the swing portion 2 is inclined after being used for a long time is avoided, the spring column 1 comprises a spring seat 11, an output rod 12 and a fixing ring 13, the fixing ring 13 is sleeved on the output rod 12, the output rod 12 is fixedly connected on the spring seat 11, the fixing ring 13 is fixed on the swing portion 2 through an external bolt, the tail end of the spring seat 11 is clamped inside the fixing seat 61, when the device is used, the external bolt penetrates through the fixing ring 13, so that the external bolt can be connected with the swing portion 2, the spring column 1 is fixed on the swing portion 2, the external, the ferrule 41 is sleeved on the connecting rod 42, the ferrule 41 is fixed on the swing part 2 through an external bolt, one end of the connecting rod 42, which is far away from the ferrule 41, is connected with external equipment, when the device is used, the ferrule 41 is sleeved on the connecting rod 42, when the external bolt penetrating through the ferrule 41 is connected with the swing part 2, the connecting rod 42 is fixed on the swing part 2, the shell assembly 6 comprises a fixed seat 61, a shell 62, a connecting ring 63, a connecting column 64, a fixed column 65 and a bearing 66, the fixed seat 61 is fixedly connected with one side part of the inside of the shell 62, the connecting ring 63 is fixedly connected with the opposite part of the inside of the shell 62 and the fixed seat 61, the connecting ring 63 is sleeved on the external connecting rod 4, the bottom of the bearing 66 is fixedly connected with the front side part of the inside wall of the shell 62, the fixed column 65 is, the top end of the fixed column 65 is abutted against the bottom of the lower tooth piece 53, the connecting column 64 is inserted in the connecting hole 52, the top end of the connecting column 64 is connected with external equipment, when the device is used, the arrangement of the fixed seat 61 can realize that the spring column element 1 is fixed on the shell component 6, meanwhile, the arrangement of the connecting ring 63 can realize that the extension rod 4 penetrates through the shell component 6 to be connected with external equipment, the top of the fixed column 65 is abutted against the swing tooth 5, can realize the drag and drop function on the swing tooth 5, further realize the stable matching work of the swing tooth 5 and the swing part 2, for the inner wall diameter of the fixed seat 61 is larger than the outer wall diameter of the spring column member 1, the inner wall diameter of the connecting ring 63 is larger than the outer wall diameter of the extension rod 4, the swing part 2 can slightly move in the working process, and the occlusion degree between the swing part 2 and the swing teeth 5 can be corrected;

wherein as shown in fig. 1-4, telescopic rod 3 includes base 31, telescopic link body 32 and support circle 33, base 31 fixed connection is in the rear end of telescopic link body 32, support circle 33 fixed connection at the front end of telescopic link body 32, the device is when using, to supporting circle 33 through external bolt fastening on goods of furniture for display rather than for use 2, base 31 passes through external bolt fastening on shell subassembly 6, can realize telescopic rod 3 fixes between shell subassembly 6 and goods of furniture for display rather than for use 2, and then can realize telescopic rod 3 to the interlock degree correction between goods of furniture for display rather than for use 2 and the pendulum tooth 5.

As shown in fig. 1-4, the swing tooth 5 includes an upper tooth 51, a connecting hole 52, a lower tooth 53 and a tooth opening 54, the lower tooth 53 is fixedly connected to the bottom of the upper tooth 51, the connecting hole 52 is formed through the upper tooth 51 and the lower tooth 53, the tooth opening 54 is formed in the front sides of the upper tooth 51 and the lower tooth 53, the tooth opening 54 is engaged with the rear portion of the swing portion 2, a gap is formed between the bottom of the upper tooth 51 and the swing portion 2, when the device is used, the arrangement of the upper tooth piece 51 and the lower tooth piece 53 can increase the meshing degree of the swing tooth 5 and the swing piece 2, meanwhile, a gap is reserved between the bottom of the upper tooth piece 51 and the swing piece 2, so that the friction force between the swing tooth 5 and the swing piece 2 can be reduced, the stable work between the swing tooth 5 and the swing part 2 is further realized, and meanwhile, the connecting column 64 can penetrate through the swing tooth 5 to be connected with external equipment through the arrangement of the connecting hole 52, and meanwhile, the swing tooth 5 is driven to rotate;

as shown in fig. 2-7, the sliding member 7 includes a sliding block member 71, a sliding slot 72, a base 73 and a seat plate 74, the sliding block member 71 is slidably connected to the inside of the sliding slot 72 near two ends, the lower portion of the sliding block member 71 penetrates through the sliding slot 72 and is fixed to the top of the base 73, the sliding block member 71 includes a sliding block body 711, a pulley 712 and a cylindrical rod 713, the pulley 712 is rotatably connected to the top and the bottom of the sliding block body 711 at front and rear sides at equal intervals, the cylindrical rod 713 is fixedly connected to the bottom of the sliding block body 711 at a middle position, the bottom end of the cylindrical rod 713 is fixed to the top of the base 73, the bottom of the base 73 is fixed to the top of the seat plate 74, the seat plate 74 is fixed to the inside of the housing 62 at a bottom position by an external bolt, the sliding slot 72 includes a slot plate 721, a sliding cavity 722 and a sliding way 723, the slot plate 721 is fixedly, frid 721 is through external bolt fixed connection in the bottom of goods of furniture for display rather than for use 2, slide 723 and pulley 712 are mutually supported, the device is when using, to running through external bolt on bedplate 74, can realize that the device fixes on shell subassembly 6, frid 721 is fixed with goods of furniture for display rather than for use 2 through external bolt simultaneously, can realize goods of furniture for display rather than for use 2 at the in-process of work, goods of furniture for display rather than for use 2 removes along the slip direction of slider piece 71 with spout 72, and then avoid goods of furniture for display rather than for use 2 at the in-process inclined sliding of long-time use, there is the clearance simultaneously between the front and back side of slider piece 71 and the front and back side of sliding cavity 722, and then can realize goods of furniture for display rather than for use 2 slight displacement from front to back at the.

One specific application of this embodiment is: firstly, the sliding part 7 is assembled by the staff, then the external bolt is penetrated on the seat plate 74, then the external bolt is fixedly connected with the bottom of the inner cavity of the shell component 6 by the staff, the external bolt penetrates through the chute 72 by the staff, then the bottom of the swing part 2 is abutted against the top of the chute plate 721 by the staff, then the external bolt is screwed in, and the swing tooth 5 is sleeved on the connecting column 64 by the staff, meanwhile, the swing tooth 5 is meshed with the swing part 2, and in the fourth step, the worker penetrates the external connecting rod 4 into the connecting ring 63, then the external connecting rod 4 is fixed with the swing part 2, meanwhile, the worker fixes the spring column part 1 on the swing part 2, to the tail end joint of spring column spare 1 on fixing base 61, the fifth step, the staff is fixed with goods of furniture for display rather than for use 2 stretching out of flexible member 3, the stiff end and the 6 fixed connection of shell subassembly of flexible member 3 can.

The above are only preferred embodiments of the present invention, and the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made to the technical solutions described in the above embodiments, and to some of the technical features thereof, are included in the scope of the present invention.

Claims

1. The utility model provides a gear interlock degree adjustable auto steering ware, includes goods of furniture for display rather than for use (2), flexible member (3), extension rod (4), pendulum tooth (5) and slider (7), its characterized in that: a spring column piece (1) is fixedly connected to one side of the swing piece (2), an external connecting rod (4) is fixedly connected to the other side of the swing piece (2), a sliding piece (7) is fixedly connected to the bottom of the swing piece (2), the rear side of the swing piece (2) is located on two sides and is fixedly connected with telescopic rod pieces (3), swing teeth (5) are meshed to the front side of the swing piece (2), and the bottom of the sliding piece (7) is fixedly connected to the bottom of the inner side wall of the shell component (6);

the telescopic rod piece (3) comprises a base (31), a telescopic rod body (32) and a supporting ring (33), the base (31) is fixedly connected to the rear end of the telescopic rod body (32), and the supporting ring (33) is fixedly connected to the front end of the telescopic rod body (32);

the swing tooth (5) comprises an upper tooth piece (51), a connecting hole (52), a lower tooth piece (53) and a tooth opening (54), the lower tooth piece (53) is fixedly connected to the bottom of the upper tooth piece (51), the connecting hole (52) penetrates through the upper tooth piece (51) and the lower tooth piece (53), and the tooth opening (54) is formed in the front side of the upper tooth piece (51) and the front side of the lower tooth piece (53);

the sliding part (7) comprises a sliding block piece (71), a sliding groove (72), a base (73) and a seat plate (74), the sliding block piece (71) is connected to the inner portion of the sliding groove (72) in a sliding mode and is close to the two end portions, the lower portion of the sliding block piece (71) penetrates through the sliding groove (72) and is fixed to the top of the base (73), the bottom of the base (73) is fixed to the top of the seat plate (74), and the seat plate (74) is fixed to the inner portion of the shell (62) through an external bolt and is located at the bottom.

2. A gear engagement adjustable steering gear according to claim 1, wherein the notch (54) is engaged with the rear of the rocker (2) and there is clearance between the bottom of the upper member (51) and the rocker (2).

3. The automobile steering gear with the adjustable gear engagement degree according to claim 1, characterized in that the sliding block member (71) comprises a sliding block body (711), pulleys (712) and a cylindrical rod (713), the pulleys (712) are rotatably connected to the top and the bottom of the sliding block body (711) at equal intervals and are positioned at the front and rear side parts, the cylindrical rod (713) is fixedly connected to the bottom of the sliding block body (711) at the middle part, and the bottom end of the cylindrical rod (713) is fixed to the top of the base (73).

4. The automobile steering gear with the adjustable gear engagement according to claim 1, characterized in that the sliding groove (72) comprises a groove plate (721), a sliding cavity (722) and a slideway (723), the groove plate (721) is fixedly connected to the top of the sliding cavity (722), and the slideway (723) is fixedly connected to the bottom of the groove plate (721) and the lower portions of the front inner side wall and the rear inner side wall of the sliding cavity (722).

5. A gear engagement adjustable steering gear according to claim 4 wherein the runner (723) is fitted with a pulley (712), and the slot plate (721) is fixedly attached to the bottom of the swing member (2) by means of external bolts.

6. The automobile steering gear with the adjustable gear engagement degree according to claim 1, characterized in that the spring column (1) comprises a spring seat (11), an output rod (12) and a fixing ring (13), the fixing ring (13) is sleeved on the output rod (12), the output rod (12) is fixedly connected to the spring seat (11), the fixing ring (13) is fixed on the swing part (2) through an external bolt, and the tail end of the spring seat (11) is clamped inside the fixing seat (61).

7. The automobile steering gear with the adjustable gear engagement degree according to claim 1, characterized in that the external connecting rod (4) comprises a ferrule (41) and a connecting rod (42), the ferrule (41) is sleeved on the connecting rod (42), the ferrule (41) is fixed on the swing part (2) through an external bolt, and one end of the connecting rod (42) facing away from the ferrule (41) is connected with an external device.

8. The automobile steering gear with the adjustable gear engagement degree according to claim 1, characterized in that the housing assembly (6) comprises a fixed seat (61), a housing (62), a connecting ring (63), a connecting column (64), a fixed column (65) and a bearing (66), wherein the fixed seat (61) is fixedly connected to the inside of the housing (62) at one side part, the connecting ring (63) is fixedly connected to the inside of the housing (62) at a position opposite to the fixed seat (61), the bottom of the bearing (66) is fixedly connected to the front side part of the inside wall of the housing (62) at the middle part, the fixed column (65) is rotatably connected to the bearing (66), and the connecting column (64) is fixedly connected to the top of the fixed column (65).

9. The automobile steering gear with the adjustable gear engagement is characterized in that the connecting ring (63) is sleeved on the external connecting rod (4), the connecting column (64) is inserted into the connecting hole (52), the top end of the connecting column (64) is connected with external equipment, and the top end of the fixing column (65) abuts against the bottom of the lower tooth piece (53).