CN104141485B - Actuation motor set of electronic lock - Google Patents

Abstract

The invention relates to an actuation motor set of an electronic lock. The actuation motor set comprises a fixed seat, a motor, a worm and a spring, wherein the fixed seat is provided with an accommodating chamber; the motor is connected with the fixed seat and is provided with a rotating shaft; the worm is connected to the rotating shaft, a tooth arranged on the worm is not completely extended to a boosting end and a reset end at two ends of the worm; and a sleeved part of the spring is bent to the worm to form a horizontal hook shape to be hooked on the tooth in a sleeving manner, the part, located outside the sleeved part, of the spring is a pushing and propping part, and the inner diameter of the pushing and propping part is larger than the outer diameter of the tooth. The spring can be spirally pushed by the tooth with the rotation of the worm and then moves forward and backward in the axial direction of the worm, when the spring moves to the boosting end of the worm, idling is formed due to absence of sleeved pushing of the tooth, and when the spring reversely moves to the reset end, the idling is also formed due to absence of sleeved pushing of the tooth, so that the overshoot phenomenon during driving of the actuation motor is prevented.

Description

The start groups of motors of electronic lock

Technical field

The present invention with regard to a kind of start groups of motors, especially with respect to a kind of start groups of motors being arranged in electronic lock.

Background technology

Common mechanical formula lockset, is the configuration by locking bolt in its core, reaches what its exclusive key could be opened Antitheft purpose.However, this kind of lockset is often cracked using special machine instrument by intentionally personage.Therefore, it is further to strengthen The unlocking difficulty of lockset, prior art have the invention wound that electronic induction identification mechanism is combined with traditional mechanical formula lockset Make, by mechanical type and the dual locking of electronic type, reach optimal anti-theft feature.

As shown in figure 1, which includes a core 20, core 20 is connected with a clutch to electronic lock structure of the prior art Device 30, a cam 40, a start groups of motors 50 and a knob heart 60.Aforementioned components are installed in a housing 70, then by knob One end of the heart 60 is connected with knob 80.When core 20 is inserted using correct key 10, which can smoothly pass through spoon ditch and push away Which is made backward to front clutch part 31, at the same time, key 10 by electronics contact induction, by stored by chip on key 10 Password or data are sent to electronic lock control system and are recognized, if comparison result is correct, electronic lock will start start motor Group 50 so as to drive and start to elapse related component, and then rear clutch part 33 is elapsed forward, make connecing for the rear clutch part 33 Close groove 331 to engage with front clutch part 31, now cam 40 can be made to interlock pivot through conducting piece 32 by the torsion of key 10 Then open lockset.

Start groups of motors 50, its function are to make lockset into unlocking condition is treated, if start groups of motors 50 breaks down, i.e., Just mechanically all it is consistent with identification electronically, still lockset cannot be opened, therefore, electronics of the start groups of motors 50 in electronic lock Play the part of a considerable role in making mechanism.Be therefore, start groups of motors 50 make flowing mode and rate of breakdown number, Using effect and the life-span of electronic lock are affected profoundly.It is not provided with fitting during the revolution of start groups of motors of the prior art When position-limit mechanism, therefore when motor drive the component being connected reach or after move when, the component is overshooted and is pushed to which On the one hand its component, make motor often because overshoot affects its service life, on the other hand other components is pushed and is made Into the displacement or loose contact of intraware, make the probability that electronic lock breaks down at a relatively high.Although there is many existing skills later Art improvement start groups of motors is provided with limit induction device and limiting card supports mechanism, but these components are complex, therefore in processing procedure On also become relatively complicated, and because utilizing more component and electronic building brick so that cost is relative to be improved, and reduces product Competitiveness.

The content of the invention

For the component precise displacement for driving start motor, it is to avoid start motor output power overshoot of the prior art Phenomenon, and then make motor have longer service life, the probability that electronic lock breaks down is reduced, while component processing procedure is reduced, with The purpose of manufacturing cost is reduced, the present invention will provide a kind of motor drive component for being totally different from prior art, utilize The spacing drive member simplified, makees flowing mode by driving of the spring with worm screw, is easily achievable aforesaid purpose.

The start groups of motors of electronic lock of the present invention, including：One fixed seat, the fixed seat are provided with a room；One motor, the horse Up to connecting with the fixed seat, and it is provided with a rotating shaft；One worm screw, the worm screw are arranged in the rotating shaft, the teeth set by the worm screw Distribution does not extend to a propulsion end and a reset terminal at the worm screw two ends completely；And a spring, a socket part of the spring Horizontal hook is bent into the worm screw and is hooked and is placed in the teeth, part of the spring outside the socket part is a pushing and pressing part, and this pushes away External diameter of the internal diameter of support more than the teeth, wherein, the spring can be because the worm screw rotates with the teeth auger in this Worm shaft is moved forward and backward upwards, forms sky because elapsing without the teeth phase fit when which is moved to the propulsion end of the worm screw Turn, and also idle running is formed because elapsing without the teeth phase fit when which is moved backward to the reset terminal.Wherein, the pushing and pressing part is entered One step abuts clutch part after having, and the rear clutch part is provided with an at least sliding groove, and is sheathed in the room, then sets in the room There is a corresponding at least raised line, being allowed to can the sliding in the room.

By the collocation of worm screw of the present invention and spring, when start revolution, worm screw is also in company with rotation, its tooth during rotation Simultaneously spirally mode rotates tooth, and rotation then can will hook the spring that is placed on thread clutch part direction backward simultaneously with socket part Push, and then the rear clutch part for abutting against gradually is elapsed outward.However, when spring socket part is passed pushing away to no teeth During inlet side, because without teeth rotary impetus, spring will not continue to push against forward, and which also can be persistently revolved by teeth because of socket part Turn to support without shrinking back, therefore the situation for overshooting can be avoided to occur at propulsion end spring retainer.Same principle, works as horse Up to it is related invert worm screw when, teeth then can by the socket part of spring toward motor direction draw move, when spring, its belled position is moved to During reset terminal, similarly because there is no teeth, lose drawing and move driving force, form idle running, and no longer elapse toward motor direction, while Because teeth are persistently rotated against without shrinking back, reach the purpose of spring retainer.

It is event, by the present invention, power drive can be reached with spacing purpose with the component most simplified, it is to avoid motor drives Dynamic overshoot phenomenon, and because spring is moved forward and backward with its axis direction on worm screw, on group sets and do not need additional member with Accommodation space, therefore device volume can be also reduced, therefore the purpose simplified processing procedure and reduce manufacturing cost can be reached simultaneously, make product It is more competitive.

Additionally, for, when rear clutch part is coupled with cam, it is more accurate to position, while increasing which rotates torsion, the present invention The start groups of motors of electronic lock provides a kind of rear clutch part structure of novelty simultaneously, and the rear clutch part includes：One pedestal, the pedestal Two perforation and two limiting sections are provided with, between two limiting section, a cushion space is formed with；Two positioning sliding blocks, connect between two positioning sliding block After being connected to an elastic partss, it is located in the cushion space, two positioning sliding block can be in the cushion space with the elastic partss Buffering inside contract and close to each other or be located remotely from each other because of the ejection of elastic force, respectively the positioning sliding block is on outer peripheral face and is formed respectively There is a location division；One second exntension tubs, second exntension tubs are connected to the pushing and pressing part；And a clutch block, the clutch block connects In second exntension tubs relative to the pushing and pressing part the other end, a clutch block projection at least clamping pole, the clamping pole is in this Pushing and pressing part can stretch out the corresponding perforation after pushing against second exntension tubs；Wherein, the cam be provided with two can be with the slide block The locating slot that location division is coupled, and at least one can be with the draw-in groove of the clamping pole phase clip.

The two is mutually pushed away by two positioning sliding blocks set by clutch part afterwards, the elastic force by the elastic partss under original state From making to couple respectively and be resisted against in the locating slot.When pedestal is rotated, after two positioning sliding blocks are by the pushing and withstanding of locating slot, because having The spring damping of elastic partss, two positioning sliding blocks gradually can be inside contracted and close to each other, and then depart from the coupling with locating slot, therefore The rotation of pedestal can't the rotation with moving cam.But work as starter motor, after making the pushing and pressing part displacement of spring, the second exntension tubs are also Can be moved toward pedestal direction by pushing and pressing, by the now clamping pole connected by the second exntension tubs, stretch out the perforation set by pedestal, And the further draw-in groove phase clip with cam, under this state, rotating pedestal can the rotation with moving cam and opening door lock.

Embodiments of the present invention are further illustrated below in conjunction with accompanying drawing, following cited embodiments are to illustrate this Invention, be not limited to the scope of the present invention, it is any to be familiar with those skilled in the art, without departing from the present invention spirit and In the range of, when a little change and retouching, therefore protection scope of the present invention can be done as the guarantor that be defined depending on appended claims Shield scope is defined.

Description of the drawings

Fig. 1 is the decomposing schematic representation of electronic lock of the prior art.

Schematic diagrams of the Fig. 2 for the embodiment of the present invention.

Exploded perspective views of the Fig. 3 for the embodiment of the present invention.

Part combination diagrams of the Fig. 4 for the embodiment of the present invention.

Schematic side views of the Fig. 5 for the part combination of the embodiment of the present invention.

Cross-sectional schematics of the Fig. 6 for the embodiment of the present invention.

Illustrative views of the Fig. 7 for the embodiment of the present invention.

Fig. 8 is the decomposing schematic representation of another embodiment of clutch part after the present invention.

Fig. 9 is the combination diagram of another embodiment of clutch part after the present invention.

Figure 10 is the schematic side view of another embodiment of clutch part after the present invention.

Figure 11 is the illustrative view of another embodiment of clutch part after the present invention.

Wherein, description of reference numerals is as follows：

10 key, 20 core

Clutch part before 30 clutches 31

311 junction piece, 32 conducting piece

331 engaging groove of clutch part after 33

40 cam, 50 start groups of motors

The 60 knob heart, 70 housing

80 knob, 90 start groups of motors

91 fixed seat, 911 room

912 raised line, 92 motor

921 rotating shaft, 93 worm screw

931 teeth 932 advance end

933 reset terminal, 94 spring

941 socket part, 942 pushing and pressing part

Clutch part after 943 fixed parts 95

951 first exntension tubs, 952 sliding groove

953 snap-latch piece, 96 circuit group

971 second exntension tubs of clutch part after 97

9711 sliding groove, 9712 fixing hole

972 clutch block, 9721 clamping pole

9722 fixed part, 973 pedestal

9731 limiting section, 9732 slip hole

9733 9734 cushion spaces of perforation

974 positioning sliding block, 9741 location division

9742 guiding 975 elastic partss of projection

98 cam, 981 locating slot

982 draw-in grooves

Specific embodiment

Please also refer to the schematic appearance that Fig. 2 to Fig. 5, Fig. 2 and Fig. 3 are the embodiment of the present invention to illustrate with stereo decomposing Figure, the schematic diagram that Fig. 4 is then combined for embodiment of the present invention part with Fig. 5.The start groups of motors of the electronic lock of the embodiment of the present invention 90, which connects clutch part 95 after being butted on by a spring 94.Clutch part 95 is socketed in fixed seat 91 afterwards, and can be in set by which Sliding in room 911.When spring 94 is elapsed by worm screw 93, rear clutch part 95 is made by the sliding outward of room 911 by related, and energy Engage with front clutch part 31 (refer to Fig. 1 signals), reach the purpose of its unlocking.

Please continue to refer to Fig. 3 to Fig. 5, in the present embodiment, the start groups of motors 90 of electronic lock, including：One fixed seat 91, One motor 92, a worm screw 93 and a spring 94.

Fixed seat 91, which can be the integrally formed of the present embodiment, or more lower or alternate manner phase group set, its configuration is not It is provided with any restriction.Fixed seat 91 is provided with a room 911, to be installed with motor 92, worm screw 93 and spring 94 in this example Deng component, and the first exntension tubs 951 of rear clutch part 95 are made to obtain in wherein sliding.The outer rim configuration of the first exntension tubs 951 and appearance 911 configuration of room is corresponding, enables sliding wherein, and its shape is also not provided with any restriction.To make to tie up during the first 951 sliding of exntension tubs Its direction is held, 951 outer rim of the first exntension tubs can be provided with an at least sliding groove 952, and corresponding raised line is arranged in room 911 912.Slipping mechanism of the clutch part 95 in room 911, is not provided with any restriction afterwards, and which also can be mutual with sliding groove by raised line Change setting, or the structure that corresponding socket is formed using non-cylindrical any external form.First exntension tubs 951 are equipped with an engaging Piece 953, the configuration of the snap-latch piece 953 are not provided with any restriction, can according to needed for front clutch part or corresponding configuration in addition Arrange.

Motor 92, its axle in the rotating shaft 921 connect a worm screw 93.Worm screw 93 can directly be arranged in rotating shaft 921 such as the present embodiment On, a link slot (not shown) also can be first opened up at axle center, and after connecing in link slot and setting a connection piece (not shown) Axle is connected in rotating shaft 921 again.Between worm screw 93 and motor 92, a bearing (not shown), mat can be further installed in rotating shaft 921 When the reverse pushing to worm screw 93 is produced with the clutch part 95 after spring 94 is pushed against, can lower anti-via the buffering of bearing The rotary resistance that thrust is produced to worm screw 93, makes the rotation of worm screw 93 more smoothly steady, and then increases the use longevity of worm screw 93 Life.Worm screw 93 is provided with teeth 931, but teeth 931 are not extended to advance end 932 and reset terminal 933.

Spring 94, its two ends are respectively socket part 941 and pushing and pressing part 942.Socket part 941 is in the present embodiment to worm screw 93 It is bent into horizontal hook and hooks and be placed in the teeth 931.Socket part 941 bend after position can between the external diameter of the teeth 931 with it is interior Between footpath, socket part 941 is abutted against in teeth 931, then when 931 helical rotation of teeth, can spiral drive hook set set Socket part 941, makes spring 94 also move forward with helical rotation.The length that socket part 941 is bent in the present embodiment accompanying drawing close to The interior electrical path length of spring 94, but this is not limited only to, which can adjust its length according to the external diameter of worm screw 93.During adjustment, may be selected There is the length of maximum contact area when hooking set, or must can hook and entangle teeth 931 compared with its length or short length, but its shortest length One.Additionally, socket part 941 bending angle can perpendicular to rotating shaft 921, or correspond to 931 helix of teeth and in vertical 921 side of rotating shaft is upwardly formed and lead angle identical angle.

On the other hand, the diameter identical spring body in the present embodiment of pushing and pressing part 942, but this is not limited only to, which is also The helical structure that can be become larger to pushing and pressing part 942 from 941 end of socket part for a diameter, or other configurations, as long as its internal diameter is big In the external diameter of teeth 931, but its external diameter still should be less than the size that the first exntension tubs 951 can be installed with.Spring 94 can be the right side Rotation is left-handed, is not provided with limiting.The end of pushing and pressing part 942 directly can be connected with the first exntension tubs 951, also can further in End is bent to form a fixed part 943 to axle center, uses and is fastened in the first exntension tubs 951.The configuration of fixed part 943 is simultaneously Any restriction is not provided with, can be linear or arc, circle.

Group sets the present embodiment when inventing, and first 93 axle of worm screw is connected to after motor 92, is socketed spring 94 on the worm screw 93, and in After on spring 94, lid connects rear clutch part 95, it is installed in the room 911 of fixed seat 91.Motor 92 is electrically connected with a circuit group 96, Be used to sensing after startup power supply and control its rotation.

Fig. 6 and Fig. 7, Fig. 6 be refer to the illustrative view that Fig. 7 is the embodiment of the present invention.When motor 92 not yet starts, The socket part 941 of spring 94 is hooked by the teeth 931 of the reset terminal 933 for being placed on worm screw 93, then the first exntension tubs of clutch part 95 951, when the not actuated driving worm screw 93 of motor is with spring 94, are still located in the room 911 of fixed seat 91.

After motor 92 starts to start, worm screw 93 starts to rotate, the also helical rotation therewith of teeth 931.Now, hook and be placed on tooth Socket part 941 by tooth 931 i.e. by the thrust produced by 931 helical rotation of teeth, along gradually the pushing away toward worm screw 93 of teeth 931 932 direction of inlet side is moved, and the first exntension tubs 951 of the i.e. whole clutch part 95 backward of whole spring 94 are pushed against, and make rear clutch part 95 Moved by 911 China and foreign countries of room.When socket part 941 gradually moves closer to propulsion end 932, rear clutch part 95 is gradually by pushing and pressing to calmly Position, now, although spring 94 still persistently pushes the of short duration time, obtains by by its spring damping, it is to avoid excessively push against.Work as socket Portion 941 is moved to when advancing end 932 as teeth 931 are not provided with this, it is impossible to draw shifting socket part 941 again so that spring 94 Idle running is formed, does not have the output of forward thrust amount again.Additionally, though spring 94 can produce reverse elastic force because of clutch part 95 after pushing and pressing, But the spiral pushing and pressing that socket part 941 still can receive teeth 931 lasting, without moving toward reset terminal 933, make to reach rear clutch part 95 spacing purposes.

Therefore, can be according to required driving force, the length of 95 necessary displacement of clutch part after cooperation arranges corresponding teeth 931 distribution development lengths, or the length of adjustment spring 94, you can reach the purpose of accurate limiting.Implement by the aforementioned present invention Example makees mechanism, not only may achieve accurate limiting purpose, and because the driving force for not having excess is exported, therefore also do not have overshoot Phenomenon occurs.Meanwhile, because resistance is not received when motor is persistently rotated, therefore can also solve originally therefore shorten its service life Problem.

On the other hand, when rear clutch part 95 resets, motor 92 starts to rotate backward.Now, it is former to receive what teeth 931 were pushed against Spring socket part 941, just rotates along 931 reverse acting spiral of teeth and elapses, and move toward reset terminal 933, mobile spring 94 simultaneously By fixed part 943 by rear clutch part 95 from the first exntension tubs 951 toward pulling back, after making, from rear component 95, gradually sliding enters room In 911, and depart from front clutch part or cam (not shown).When socket part 941 is moved close to reset terminal 933, equally Also because there is no the auger of teeth 931, it is impossible to further elapse, and form idle running.

As the spring 94 of the present invention is moved forward and backward with its axis direction on worm screw 93, on group sets and need not additionally Component and accommodation space, therefore diminution device volume is also can reach, and reduce the purpose of component cost.

Please also refer to Fig. 8 and after Fig. 9, Fig. 8 are the present invention with Fig. 9 the decomposition of another embodiment of clutch part with combine signal Figure.After the present invention in another embodiment of clutch part, rear clutch part 97 can be coupled with a cam 98.Cam 98 is provided with two locating slots 981 and two draw-in grooves 982.Clutch part 97 then includes afterwards：One second exntension tubs 971, a clutch block 972, a pedestal 973, two are fixed Position slide block 974 and an elastic partss 975.After two positioning sliding blocks 974 are connected with elastic partss 975, it is located in pedestal 973, And the clutch block 972 is connected with second exntension tubs 971.

Second exntension tubs 971, its outer rim configuration are corresponding with 911 configuration of room, enable sliding wherein, and its shape does not set yet There is any restriction.To make its direction is maintained during the second 971 sliding of exntension tubs, 971 outer rim of the second exntension tubs can be provided with an at least cunning Dynamic groove 9711, and corresponding raised line 912 (refer to Fig. 3) is set in room 911.Aforementioned slipping mechanism, is not provided with appointing What restriction, raised line also can be exchanged with sliding groove and be arranged by which, or form corresponding socket using non-cylindrical any external form Structure.Second exntension tubs 971 are provided with two fixing holes 9712 in the end that spring pushing and pressing part 942 pushes against, to clutch block 972 Set fixed part 9722 is connected.

Clutch block 972, is convexly equipped with two clamping poles 9721, but the number of clamping pole 9721 in the present embodiment, is not provided with Special to limit, which can be provided only with one, or be provided with three or four, and its set location is preferred so that circumference is symmetrical.

Pedestal 973, is provided with two perforation 9733 and two limiting sections 9731 in the present embodiment.It is formed between two limiting sections 9731 One cushion space 9734, and two perforation 9733 is then located at the left and right sides of cushion space 9734.The clamping pole of clutch block 972 9721 can stretch out its corresponding perforation 9733 after spring pushing and pressing part 942 pushes against.Therefore, number and shape set by perforation 9733 Shape is not provided with special restriction, can according to set clamping pole 9721 relative set；But bore a hole position Ying Huan set by 9733 Rush outside space 9734.

Two positioning sliding blocks 974, one elastic partss 975 of middle connection.Elastic partss 975 are a spring in the present embodiment, Which can also be other resilient components of tool.Positioning sliding block 974 is located in the buffering of pedestal 973 after connecting with elastic partss 975 In space 9734, and can be close to each other because the buffering of the elastic partss 975 is inside contracted or it be located remotely from each other because of the ejection of elastic force.Respectively Positioning sliding block 974 can be respectively equipped with a guiding projection 9742, and correspondence is installed in the slip hole 9732 on pedestal 973, and is obtained Wherein sliding.Each positioning sliding block 974 is on outer peripheral face and is respectively formed with a location division 9741, and which can be with 981 phase coupling of locating slot Close.Location division 9741 in the present embodiment forms a roof-shaped structure by two planes are adjacent, therefore the locating slot 981 is in phase Correspondence recess shape.Location division 9741 can be in also arc-shaped (not shown), and the locating slot 981 is then recessed in corresponding circular arc Mouth-shaped.

Figure 10 and Figure 11, Figure 10 be please also refer to the start signal that Figure 11 is another embodiment of clutch part after the present invention Figure.(Fig. 9 is please compareed simultaneously) under original state, two positioning sliding blocks 974 set by rear clutch part 97, by elastic partss 975 Elastic force the two is mutually pushed away, make to couple respectively and be resisted against in locating slot 981.When pedestal 973 is rotated, two positioning sliding blocks After 974 by the pushing and withstanding of locating slot 981, because the spring damping of flexible component 975, two positioning sliding block 974 can be with pedestal 973 Rotation is gradually inside contracted and close to each other, and then departs from the coupling with locating slot 981, therefore the rotation of pedestal 973 can't drive The rotation of cam 98.But work as starter motor 92, after making 942 displacement of pushing and pressing part of spring, the second exntension tubs 971 can also be pushed against past 973 direction of pedestal is moved, and now the clamping pole 9721 of 971 connected clutch block 972 of the second exntension tubs can gradually stretch out seat Perforation 9733 set by body 973, to after positioning, and the further 982 phase clip of draw-in groove with cam 98.Therefore, under this state, Rotating pedestal 973 can be by the torsion of clamping pole 9721, the rotation with moving cam 98 and opening door lock.

Claims (3)

1. the start groups of motors of a kind of electronic lock, it is characterised in that include：

One fixed seat, the fixed seat are provided with a room；

One motor, the motor are connected with the fixed seat, and are provided with a rotating shaft；

One worm screw, the worm screw are arranged in the rotating shaft, and distribution does not extend to the worm screw two ends to the teeth set by the worm screw completely Propulsion end and a reset terminal；

One spring, a socket part of the spring are bent into horizontal hook to the worm screw and hook and be placed in the teeth, and the spring is in the set Part outside socket part is a pushing and pressing part, the external diameter of the internal diameter of the pushing and pressing part more than the teeth, wherein, the spring can turn because of the worm screw Move and moved forward and backward in the worm shaft upwards with the teeth auger, when which is moved to the propulsion end of the worm screw because of nothing The teeth phase fit is elapsed and forms idle running, and when which is moved backward to the reset terminal also because without teeth phase fit passage Form idle running；And

The pushing and pressing part further abutted one after clutch part, the rear clutch part is sheathed in the room, and can be slided in the room Move；

The rear clutch part further may couple to a cam, the rear clutch part, including：

One pedestal, the pedestal are provided with two perforation and two limiting sections, are formed with a cushion space between two limiting section；

Two positioning sliding blocks, after being connected with an elastic partss, are located in the cushion space between two positioning sliding block, and two positioning is slided Block can be close to each other so that the buffering of the elastic partss is inside contracted in the cushion space or be located remotely from each other because of the ejection of elastic force, respectively The positioning sliding block is on outer peripheral face and is respectively formed with a location division；

One second exntension tubs, second exntension tubs are connected to the pushing and pressing part；And

One clutch block, the clutch block are connected to the other end of second exntension tubs relative to the pushing and pressing part, and the clutch block projection is extremely A rare clamping pole, the clamping pole can stretch out the corresponding perforation after the pushing and pressing part pushes against second exntension tubs；

Wherein, the cam is provided with two locating slots that can be coupled with the slide block location division, and at least one can be with the clamping pole The draw-in groove of phase clip.

2. the start groups of motors of electronic lock as claimed in claim 1, it is characterised in that the location division is by the adjacent shape of two planes Into a roof-shaped structure, and the locating slot is in corresponding recess shape.

3. the start groups of motors of electronic lock as claimed in claim 1, it is characterised in that the location division is in arc-shaped, and this is fixed Position groove is in corresponding circular arc recess shape.