CN108167854A

CN108167854A - Automate extrusion equipment

Info

Publication number: CN108167854A
Application number: CN201810028262.7A
Authority: CN
Inventors: 艾国华
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-08-20
Filing date: 2016-08-20
Publication date: 2018-06-15
Also published as: CN108162474A; CN106239967A; CN106239967B

Abstract

Extrusion equipment is automated, including squeezing rack, PLC control devices, feeding mechanism and pressing mechanism；It is characterized in that：The pressing mechanism includes the extruded tube communicated with the feeding mechanism, the extrusion piston that clearance fit is plugged in the extruded tube, is fixed on the pressure ram of described extrusion piston one end and the extrusion oil cylinder for the extrusion piston to be driven to be moved back and forth in the extruded tube, and the extruded tube includes straight pipe and extruded segment；The extruded segment includes four pressing ribs, has opened gap between two neighboring pressing rib, secure component is equipped with outside the extruded segment.Its squeezing effect of the invention is good, and working efficiency is high, low noise.

Description

Automate extrusion equipment

Technical field

The present invention relates to machine-building engineering device technique fields, more particularly to a kind of to use sawdust, bamboo scraps, stalk etc. as original Material manufactures the automation extrusion equipment of environment-protection boiler bio-fuel.

Background technology

Go deep into the today in each corner of society in energy conservation and environmental protection, how to control the discharge of pollutant is always whole society's concern The problem of, and the existing boiler used in the factory, much all using coal as fuel, generated in the tail gas of burning a large amount of Pollutant including sulfide, for this purpose, many factories all use biomass fuel boiler instead now, application No. is 201210436902.0, the applying date be 2012-11-05 Chinese invention patent disclose a kind of biomass boiler, the bottom of including Disk, a upper boiler, two lower boilers and a controller, two lower boiler head and the tail arrange and pass through pipeline and are connected. The Novel structure of the present invention, causes furnace wall accumulation of heat less, in this way, when mounted, you can it avoids building thick furnace wall, meanwhile, It saves or refractory material can not had to setting less.Cost is reduced, installation cost is reduced, reduces installation complexity.

The biomass fuel that biological boiler operation just has is the biology by the use of reproducible bio-fuel as fuel Fuel is made of sawdust and/or bamboo scraps and/or stalk etc., turns waste into wealth and environmental pollution is small, will be upper when manufacture After stating ingredient mixing, it is put into extruder and carries out extrusion forming, existing extrusion equipment squeezing effect is not good enough, and efficiency is inadequate It is high.

Invention content

The object of the present invention is to provide a kind of automation extruding manufactured using bamboo wood chip as the environment friendly biological fuel of raw material to set Standby, squeezing effect is good, and working efficiency is high, low noise.

The present invention above-mentioned technical purpose technical scheme is that：Extrusion equipment is automated, including Squeeze rack, PLC control devices, feeding mechanism and pressing mechanism；It is characterized in that：The pressing mechanism include and it is described into Extrusion piston that the extruded tube that communicates of material mechanism, clearance fit are plugged in the extruded tube is fixed on the extrusion piston one The pressure ram at end and the extrusion oil cylinder for the extrusion piston to be driven to be moved back and forth in the extruded tube, the extruded tube Including straight pipe and extruded segment；The extruded segment includes four pressing ribs, has opened gap between two neighboring pressing rib, Secure component is equipped with outside the extruded segment.

As the preferred technical solution of the present invention, each pressing rib includes multiple points of gussets, the secure component packet Rectangular shaped rim, the extrusion screw being threaded in rectangular shaped rim and the total pushing plate connected with the pressing rib are included, always Pushing plate and it is two outermost described in gusset is divided to be welded and fixed；It is also threadedly coupled in the rectangular shaped rim and is used for adjusting described point Gusset divides adjusting screw and silencer mechanism, described that adjusting screw end is divided to be equipped with rotatable crushing block.

As the preferred technical solution of the present invention, the silencer mechanism include being fixed on cylinder body in the rectangular shaped rim, Piston rod and the piston cavity of the piston cavity, clearance fit being located in the cylinder body in piston cavity communicate Oil inlet, for controlling in the piston cavity overflow valve of oil liquid pressure and for monitoring fluid in the piston cavity The pressure sensor of pressure.

It is described that gusset is divided to be equipped with sliding cavity as the preferred technical solution of the present invention, sliding block is equipped in sliding cavity, it is described Sliding block is equipped with rack, described that gusset is divided to be equipped with rotary screw, rotary screw and is fixedly connected with rack meshed gears, institute The other end opposite with the sliding cavity on point gusset is stated equipped with sliding block socket.

As the preferred technical solution of the present invention, four extensions are laid on the pressure ram and are squeezed soon, further include use In the rotating mechanism for driving the extrusion piston rotation.

As the preferred technical solution of the present invention, the rotating mechanism includes the short straight-tooth being located on the extrusion piston Wheel and the long spur gear of the short spur gear engagement, the servo motor and rotation-preventing mechanism that drive the long spur gear rotation.

As the preferred technical solution of the present invention, the rotation-preventing mechanism is stretched including expansion plate with what the expansion plate connected It contracting cylinder, the elastic ball being located on the expansion plate end and is located on the expansion plate end two and is located at the elastic ball The long spur gear surface fitting block of both sides.

As the preferred technical solution of the present invention, the extrusion piston end is equipped with connecting hole and the connecting hole communicates Connecting cavity and the lateral openings that are communicated with the connecting hole and connecting cavity, be fixed on the piston rod of the extrusion oil cylinder Connection ring in the connecting cavity, the connection ring and the connecting cavity form punching between the side of the connecting hole Hit chamber.

As the preferred technical solution of the present invention, the feeding mechanism includes the charging material with inlet port and outlet port Cam that bucket, mounting bracket, first reducing motors are fixedly connected with the first reducing motors output shaft is located at the mounting bracket On rotary driving part and moved up and down by the actuated by cams on the mounting bracket and driven by the rotation Dynamic portion drives the logical material portion of rotation.

Logical material is carried out to feed hopper using logical material portion, by first reducing motors band moving cam, realizes the upper of logical material portion Material is led in lower movement, logical material portion is driven to carry out rotating logical material by rotary driving part.

As the preferred technical solution of the present invention, the logical material portion includes the rotary shaft being located on the mounting bracket, is located at Axial cavity in the rotary shaft, the splined hole being located in the axial cavity and splined hole cooperation splined shaft, be fixed on Lower material-passing rod on the splined shaft, is located at the axial cavity bottom surface and the flower at the upper ejector pin being fixed on the splined shaft Dynamic clamping head and quiet clamping head between key axis and the driven wheel being fixed in the rotary shaft.

As the preferred technical solution of the present invention, the rotary driving part includes second reducing motors and for driving State the driving wheel of driven wheel rotation.

As the preferred technical solution of the present invention, the dynamic clamping head and quiet clamping head is spring.

As the preferred technical solution of the present invention, the driven wheel and the driving wheel are all gears.

As the preferred technical solution of the present invention, the lower material-passing rod lower end is equipped with multiple lower hang plates and positioned at described Multiple upper hang plates above lower hang plate.

As the preferred technical solution of the present invention, the lower hang plate for lower end connect with the lower material-passing rod and upwards together When outwardly extending hang plate, and the lower hang plate and the lower material-passing rod are into 8-10 ° of angle；The upper hang plate is upper end It is connected with the lower material-passing rod and downward while outwardly extending hang plate, and the upper hang plate and the lower material-passing rod are into 8- 10 ° of angles.

As the preferred technical solution of the present invention, the lower hang plate and the lower material-passing rod are hinged, the upper hang plate It is hinged with the lower material-passing rod, and support spring is equipped between the lower hang plate upper end and the lower material-passing rod；The updip Tension spring is equipped between inclined plate lower end and the lower material-passing rod.

As the preferred technical solution of the present invention, the lower material-passing rod bottom surface is equipped with rolling steel balls.

As the preferred technical solution of the present invention, the lower material-passing rod is equipped with annulus, and the annulus lower surface is equipped with circle Cone has eccentricity between the annulus and the lower material-passing rod.

As the preferred technical solution of the present invention, the lower material-passing rod is equipped with annulus, and the annulus passes through oscillating bearing It is connected with the lower material-passing rod.

As the preferred technical solution of the present invention, the lower hang plate upper end is downward and curves inwardly to form bending plate, The lower material-passing rod lower end is fixed with stirring pipe, and the stirring pipe lower end is equipped with cone-shaped inner hole, branch is equipped in the cone-shaped inner hole Platform is held round, is fixed with the connecting rod being plugged in the stirring pipe on the support round platform, suit resets bullet in the connecting rod Spring, the stirring pipe lower end are evenly distributed with multiple open slots, expansion gusset are formed between two neighboring open slot.

Preferably, the straight pipe is equipped with striking mechanism.

Preferably, the striking mechanism include rotation bent axle, drive it is described rotation bent axle rotation bent axle servo motor, With the bent axle hinged movable rod, the sliding plunger being hinged on the movable rod lower end, for installing the slip The guide cylinder of piston, the lantern ring being located on the straight pipe, the percussion piston being located on the lantern ring and for being struck to described Hit the resetting spring that piston is resetted.

Preferably, the lantern ring is sleeved on the straight pipe, the lantern ring is equipped with driven gear and the rotation The driving gear of gear engagement and the rotation servo motor for driving the driving gear rotation, are located on the rotation lantern ring It is six to tap piston, and the diameter for tapping piston becomes larger clockwise.

In conclusion the invention has the advantages that：

Its squeezing effect is good, and working efficiency is high, and low noise ensure that the normal work of extruder.

Description of the drawings

Fig. 1 is the structure diagram of the embodiment of the present invention 1；

Fig. 2 is secure component structure chart in the present invention；

Fig. 3 is long spur gear and short spur gear mesh schematic representation in the present invention；

Fig. 4 is feeding mechanism structure chart of the present invention；

Fig. 5 is the dimensional structure diagram for leading to material portion in Fig. 4；

Fig. 6 is the structure diagram of the embodiment of the present invention 2；

Fig. 7 is the structure diagram of the embodiment of the present invention 3；

Fig. 8 is the structure diagram of the embodiment of the present invention 4；

Fig. 9 is driven gear and driving gear engagement figure in Fig. 8；

Figure 10 is silencer mechanism structure chart；

Figure 11 is divides sliding cavity and sliding shoe position assumption diagram on gusset.

Specific embodiment

Below in conjunction with attached drawing, the invention will be further described.

Embodiment 1：As shown in Fig. 1,2,3,10,11, automate extrusion equipment, including squeeze rack 3, PLC control devices, Feeding mechanism 1 and pressing mechanism 2；The pressing mechanism 2 includes the extruded tube 201 communicated with the feeding mechanism 1, gap is matched Close be plugged in the extruded tube 201 extrusion piston 202, be fixed on described 202 one end of extrusion piston pressure ram 203 and For the extrusion oil cylinder 204 that the extrusion piston 202 is driven to be moved back and forth in the extruded tube 201, the extruded tube 201 wraps Include straight pipe 201a and extruded segment 201b；It further includes to sense the extrusion piston home position sensing of extrusion piston position, squeeze Piston end point sensor（It is not drawn into figure）, PLC control devices and extrusion piston home position sensing, extrusion piston end point sensor Connection, when reaching home when extrusion piston is being squeezed, extrusion piston end point sensor sends out signal, PLC Control device causes extrusion oil cylinder stopping to act, and retracts, and when extrusion piston reaches original position, extrusion piston senses in situ Device signals to PLC control devices so that extrusion oil cylinder stopping acts；Extrusion oil cylinder be fixed on squeeze rack on, extruded tube and Feeding mechanism communicates, and the pressing material come in from feeding mechanism, which enters in extruded tube, to be extruded, and line is by straight pipe subsequently into crowded Press section.

Further, the extruded segment 201b is included between four pressing ribs 201d, two neighboring pressing rib 201d There is opened gap, the width of pressing rib 201d is equipped with tight with being become larger far from straight pipe outside the extruded segment 201b Gu component 205, four pressing ribs are fastened together by secure component 205, form extruded segment.Each pressing rib 201d packets Multiple points of gussets are included, quantity is 5-10, and the secure component 205 includes rectangular shaped rim 205a, is threaded in rectangular shaped rim Extrusion screw 205b on 205a and the total pushing plate 205c connected with the pressing rib 201d, total pushing plate 205c and most Gusset is divided to be welded and fixed described in two of outside；It is also threadedly coupled to be used for adjusting on the rectangular shaped rim 205a and described divides gusset Point adjusting screw 205e and silencer mechanism 205f, it is described that adjusting screw 205e ends is divided to be equipped with rotatable crushing block 205g. The silencer mechanism 205f includes the cylinder body 205f1 being fixed on the rectangular shaped rim 205a, is located in the cylinder body 205f1 Piston cavity 205f2, clearance fit are mounted on piston rod 205f3 and the piston cavity 205f2 in piston cavity 205f2 The oil inlet 205f4 that communicates, for controlling in the piston cavity 205f2 overflow valve 205f5 of oil liquid pressure and for supervising Control the pressure sensor 205f6 of oil liquid pressure in the piston cavity 205f2；The presence of silencer mechanism can offset extruding muscle The noise of formation is impacted between plate and crushing block 205g, because the contact between crushing block and pressing rib is rigid, when crowded When compression bar extruding is completed to retract, the mixture in extruded segment is become inwardly to receive by extruded outside swelling state Contracting although this shrinks less, still makes to form noise between score gusset and crushing block, and silencer mechanism can just solve Certainly this problem when pressure ram is squeezed, divides the power that gusset expands outwardly to act on piston rod 205f3, piston Bar 205f3 is generated movement so that oil liquid pressure increases in piston cavity 205f2, so that overflow valve 205f5 overflows by impact Flow pressure, when pressure ram is retracted, pass through the inside oilings of oil inlet 205f4 so that pressure restore, by pressure sensor into Row monitoring, while cause piston rod movement and gusset is divided to contact, it prepares for noise reduction next time.

Described point of gusset is equipped with sliding cavity 201d1, and sliding block 201d2 is equipped in sliding cavity, and the sliding block is equipped with rack 201d3, it is described that gusset is divided to be equipped with rotary screw 201d4, it rotary screw and is fixedly connected with rack meshed gears 201d5, The other end opposite with the sliding cavity is equipped with sliding block socket 201d6 on described point of gusset.It is laid on the pressure ram 203 Four extensions squeeze fast 206, further include the rotating mechanism 4 for the extrusion piston 202 to be driven to rotate；Two neighboring extension is squeezed Press fast 206 angles in 90 °；In order to improve squeezing effect, the rotating mechanism 4 includes being located at short on the extrusion piston 202 Spur gear 401 and the long spur gear 402 of the short spur gear 401 engagement, the servo electricity for driving the long rotation of spur gear 402 Machine 403 and rotation-preventing mechanism 404；The angle that servo motor drives the extrusion piston to rotate every time is less than 90 °, wherein, preferably It it is 30 ° or 45 °, the length of long spur gear is 3-5 times of short spur gear length.The rotation-preventing mechanism 404 include expansion plate 404a, It the telescopic cylinder 404b that is connected with the expansion plate 404a, the elastic ball 404c being located on the expansion plate 404a ends and sets Two long spur gear surface fitting block 404d for being located at the elastic ball 404c both sides on the expansion plate 404a ends；It is described 202 end of extrusion piston is equipped with the connecting cavity 6 that communicates of connecting hole 5 and the connecting hole 5 and and the connecting hole and connection The lateral openings that chamber communicates are fixed with the connection ring 7 in the connecting cavity, side on the piston rod of the extrusion oil cylinder 204 Formation to opening enters connecting cavity convenient for connection ring, and the connection ring 7 and the connecting cavity 6 are close to the side of the connecting hole Impact chamber 8 is formed between face, that is to say, that between the connecting cavity bottom surface of connecting hole and connection ring, there is gap, this Gap is formed impact chamber, impacts the structure of chamber, extrusion piston is enabled to smoothly to retract.

See attached drawing 4,5, the feeding mechanism include the feed hopper 101 with inlet port and outlet port, mounting bracket 102, Cam 104 that first reducing motors 103 are fixedly connected with 103 output shaft of first reducing motors is located at the mounting bracket It rotary driving part 106 on 102 and is moved up and down simultaneously by the cam 104 driving on the mounting bracket 102 The logical material portion 105 of rotation is driven by the rotary driving part 106；The logical material portion 105 includes being located on the mounting bracket 102 Rotary shaft 10501, the axial cavity 10502 being located in the rotary shaft 10501, the splined hole being located in the axial cavity 10502 10503 and the splined shaft 10505 coordinated of the splined hole 10504, the lower material-passing rod that is fixed on the splined shaft 10505 10506th, the upper ejector pin 10507 that is fixed on the splined shaft 10505 is located at 10502 bottom surface of axial cavity and the spline Dynamic clamping head and quiet clamping head 10508 between axis 10505 and the driven wheel 10509 being fixed in the rotary shaft 10501；In work When, first reducing motors 103 rotate, and then are rotated with moving cam 104, and upper ejector pin 10507 is impacted by cam 105, So that splined shaft does vertically movable in splined hole, logical material is carried out using lower material-passing rod, meanwhile, rotary driving part drives rotary shaft Rotation, because of the connection mode of splined shaft and splined hole, rotary shaft can drive lower material-passing rod to be rotated, in this way, lower logical material Bar is when logical material is carried out, it will be able to and logical material is carried out in a manner of vertically movable and rotate simultaneously, leads to and expects that effect is good, it is described Rotary driving part 106 includes second reducing motors and the driving wheel for the driven wheel 10509 to be driven to rotate；The elasticity Return unit 10508 is spring；The driven wheel and the driving wheel are all gears, intermeshing.

10506 lower end of lower material-passing rod is equipped with multiple lower hang plates 108 and above the lower hang plate 108 Multiple upper hang plates 107；The lower hang plate 108 connects and for lower end and the lower material-passing rod 10506 upwards simultaneously to extension The hang plate stretched, and the lower hang plate 108 and the lower material-passing rod 10506 are into 8-10 ° of angle, generally 9 °；The updip Inclined plate 107 is upper end and the lower material-passing rod 10506 connects and downward while outwardly extending hang plate, and the upper hang plate 107 and the lower material-passing rod 10506 into 8-10 ° of angle, generally 9 °.

The lower hang plate 108 and the lower material-passing rod 10506 are hinged, the upper hang plate 107 and the lower material-passing rod 10506 is hinged, and support spring is equipped between 108 upper end of lower hang plate and the lower material-passing rod 10506, and support spring is Lower hang plate extend outwardly extension；Tension spring is equipped between 107 lower end of upper hang plate and the lower material-passing rod 10506, Tension spring causes hang plate inwardly to shrink.10506 bottom surface of lower material-passing rod is equipped with rolling steel balls 111.The lower material-passing rod 10506 are equipped with annulus 112, and annulus is mounted on by oscillating bearing on lower material-passing rod；112 lower surface of annulus is equipped with circular cone Body 113 has eccentricity between the annulus 112 and the lower material-passing rod 10506.

Embodiment 2 is shown in attached drawing 6, and the place different with embodiment 1 is in the present embodiment, the lower material-passing rod 10506 lower ends are not provided with rolling steel balls 111, and are provided with stirring pipe 115, and 115 lower end of stirring pipe is equipped in taper Hole is equipped with support round platform 116 in the cone-shaped inner hole, and support round platform can move in bellmouth, on the support round platform 116 The connecting rod 117 being plugged in the stirring pipe 115 is fixed with, resetting spring 118 is set in the connecting rod 117, it is described to stir It mixes 115 lower end of pipe and is evenly distributed with multiple open slots 119, expansion gusset 120, opening well width 1- are formed between two neighboring open slot 2mm；Further, 108 upper end of lower hang plate is downward and curves inwardly to form bending plate（It is not shown in figure）.

Embodiment 3 is shown in attached drawing 7, and the place different with embodiment 1 is in the present embodiment, in order to improve logical material effect Fruit；Impact bar 109 is equipped between the lower material-passing rod 10506 and stirring pipe 115, lower material-passing rod 10506 is plugged on impact bar 109 In, impact bar is equipped with and lower material-passing rod 10506 coordinates spliced eye and diameter are more than the limit hole of the spliced eye, impact bar Lower end is stretched into limit hole and is fixed with stop nut or limited block, and multiple axial grooves are equipped in lower 10506 outer circumference surface of material-passing rod 110, the spacer pin 114 stretched into circumferential groove is fixed on the impact bar, there is impact space a between spacer pin and axial groove.

Embodiment 4 is shown in attached drawing 8,9；It is compared with embodiment 1, the straight pipe 201a is equipped with striking mechanism 9, described to strike Mechanism 9 is hit to include rotation bent axle 901, drive the bent axle servo motor 902 of rotation bent axle 901 rotation and bent axle hinge The movable rod 903 that connects, the sliding plunger 904 being hinged on 903 lower end of movable rod, for installing the sliding plunger 904 guide cylinder 905, the lantern ring 906 being located on the straight pipe 201a, the percussion piston 907 being located on the lantern ring 906 with And the resetting spring 908 for being resetted to the percussion piston 907, rotation crankshaft installed are watched on crankshaft base by bent axle It takes the drive of motor 902 to be rotated, and then sliding plunger is driven to carry out slip lifting in guide cylinder, realize to tapping piston It taps, and then realizes the percussion to straight pipe；Further, the lantern ring 906 is sleeved on the straight pipe 201a, the set Ring 906 is equipped with driving gear 910 and the drive driving gear that driven gear 909 and the rotation gear 909 engage The rotation servo motor of 910 rotations, the percussion piston 907 being located on the rotation lantern ring 906 is six, and tap piston 907 Diameter become larger clockwise, generally, the multiple with 1.1 becomes larger；Servo motor is rotated to drive actively Gear rotates, and then drives driven gear so that lantern ring rotates on straight pipe, realizes percussion pistons different every time to straight tube Section taps.

Claims

1. extrusion equipment is automated, including squeezing rack（3）, PLC control devices, feeding mechanism（1）And pressing mechanism（2）； It is characterized in that：The pressing mechanism（2）Including with the feeding mechanism（1）The extruded tube communicated（201）, clearance fit grafting In the extruded tube（201）Interior extrusion piston（202）, be fixed on the extrusion piston（202）The pressure ram of one end（203）With And for driving the extrusion piston（202）In the extruded tube（201）The extrusion oil cylinder of interior reciprocating movement（204）, it is described to squeeze Pressure pipe（201）Including straight pipe（201a）And extruded segment（201b）；The extruded segment（201b）Including four pressing ribs （201d）, two neighboring pressing rib（201d）Between have opened gap, the extruded segment（201b）Outside is equipped with secure component （205）.

2. automation extrusion equipment according to claim 1, it is characterised in that：Each pressing rib（201d）Including more It is a to divide gusset, the secure component（205）Including rectangular shaped rim（205a）, be threaded in rectangular shaped rim（205a）On extruding Screw（205b）And with the pressing rib（201d）Total pushing plate of connection（205c）, total pushing plate（205c）And outermost Two described in gusset is divided to be welded and fixed；The rectangular shaped rim（205a）On be also threadedly coupled and be used for adjusting point for dividing gusset Adjusting screw（205e）And silencer mechanism（205f）, it is described to divide adjusting screw（205e）End is equipped with rotatable crushing block （205g）.

3. automation extrusion equipment according to claim 2, it is characterised in that：The silencer mechanism（205f）Including fixation In the rectangular shaped rim（205a）On cylinder body（205f1）, be located at the cylinder body（205f1）In piston cavity（205f2）, Gap is fitted to piston cavity（205f2）In piston rod（205f3）And the piston cavity（205f2）The oil inlet communicated Mouthful（205f4）, for controlling the piston cavity（205f2）The overflow valve of middle oil liquid pressure（205f5）And for monitoring State piston cavity（205f2）The pressure sensor of middle oil liquid pressure（205f6）.

4. automation extrusion equipment according to claim 4, it is characterised in that：Described point of gusset is equipped with sliding cavity, sliding It is equipped with sliding block in dynamic chamber, the sliding block is equipped with rack, described that gusset is divided to be equipped with rotary screw, rotary screw and is nibbled with rack The gear of conjunction is fixedly connected, described that the other end opposite with the sliding cavity on gusset is divided to be equipped with sliding block socket.

5. automation extrusion equipment according to claim 4, it is characterised in that：The pressure ram（203）On be laid with Four extensions squeeze fast（206）, further include to drive the extrusion piston（202）The rotating mechanism of rotation（4）.

6. automation extrusion equipment according to claim 5, it is characterised in that：The rotating mechanism（4）Including being located at State extrusion piston（202）On short spur gear（401）And the short spur gear（401）The long spur gear of engagement（402）, drive The long spur gear（402）The servo motor of rotation（403）And rotation-preventing mechanism（404）.

7. automation extrusion equipment according to claim 6, it is characterised in that：The rotation-preventing mechanism（404）Including flexible Plate（404a）And the expansion plate（404a）The telescopic cylinder of connection（404b）, be located at the expansion plate（404a）On end Elastic ball（404c）And it is located at the expansion plate（404a）Two are located at the elastic ball on end（404c）The length of both sides is straight Gear teeth face is bonded block（404d）.