CN207361746U - A kind of lid grasping mechanism - Google Patents

Abstract

The utility model provides a kind of lid grasping mechanism, including：Housing, piston are slidably disposed in stroke chamber；Piston is fixed on the upper end of connecting rod；Pushing tow head is round estrade, and pushing tow head is fixed on the lower end of connecting rod；The lower end of pull rod has the 3rd to stop ring, and pull rod is set in connecting rod；Fixed mechanism, fixed mechanism set, which is scheduled on the first screw thread wire casing and the 3rd, to be stopped on the pull rod between ring；Adjusting nut, adjusting nut are threaded on the first screw thread wire casing；Resetting spring, resetting spring are set on pull rod, and the upper end of resetting spring props up adjusting nut, and lower end props up fixed mechanism；Multiple calvus, multiple calvus form disk pawl tool, there is the first concave ring on the inner wall of disk pawl tool, 3rd, which stops ring, is fastened in the first concave ring, have the 4th to stop ring on the inner wall of disk pawl tool, 4th upper surface for stopping ring can be bonded with the side wall of pushing tow head, and the upper surface of disk pawl tool is bonded with the lower face of fixed mechanism.Such a lid grasping mechanism is easy to implement promptly and pretensioning effect.

Description

A kind of lid grasping mechanism

Technical field

It the utility model is related to lid grasping mechanism, and in particular to a kind of lid grasping mechanism.

Background technology

In packaging field, the filling of material for bottled body grabs bottle, it is necessary to by multiple steps, has spiral cover, has Lid is grabbed, the process for having vanning etc..During this is many, spiral cover grabs what lid substantially carried out together, and grabs and cover this The quality of the quality of action just decides spiral cover quality.

The effect grabbed lid, be typically driving mechanism driving can just realize crawl in the prior art, and the pretension captured The size of power is entirely then the size of the driving force dependent on driving mechanism, and overall process excessively relies on driving mechanism.

It is necessary to be capable of providing a kind of lid grasping mechanism with preferable pretightning force.

Utility model content

The technical problems to be solved in the utility model is：In order to solve to grab in the prior art, the pretightning force of lid is general asks Topic.The utility model provides a kind of lid grasping mechanism to solve the above problems.

Technical solution is used by the utility model solves its technical problem：A kind of lid grasping mechanism, including：

Housing, the inner hollow of the housing, the upper end of the housing is open to be used to ventilate, and is had on the inner wall of the housing There is first to stop ring and second and stop ring, the described first lower face for stopping ring has stroke between the described second only upper surface of ring Chamber；

Piston, the piston are slidably disposed in the stroke chamber；

Connecting rod, the piston are fixed on the upper end of the connecting rod；

Pushing tow head, the pushing tow head are round estrade, and the pushing tow head is fixed on the lower end of the connecting rod；

Pull rod, the pull rod are tubulose, have the 3rd to stop ring, the upper end of the pull rod on the side wall of the lower end of the pull rod Side wall get on the bus and have the first screw thread wire casing, the pull rod is set in the connecting rod, and the pull rod is located at the pushing tow head Top；

Fixed mechanism, the fixed mechanism set are scheduled on the first screw thread wire casing and the described 3rd only drawing between ring On bar；

Adjusting nut, the adjusting nut are threaded on the first screw thread wire casing；

Resetting spring, the resetting spring are set on the pull rod, and the upper end of the resetting spring props up the adjusting Nut, lower end prop up the fixed mechanism；

Multiple calvus, multiple calvus form disk pawl tool, have the first concave ring, institute on the inner wall of the disk pawl tool State the 3rd only ring be fastened in first concave ring, there is the 4th only ring, the described 4th only ring on the inner wall of disk pawl tool Upper surface can be bonded with the side wall of the pushing tow head, the upper surface and the lower face of the fixed mechanism of disk pawl tool Fitting.

Preferably, further including buffer spring, have the 5th to stop ring, the side of the fixed mechanism on the inner wall of the housing Have the 6th to stop ring on wall；

The buffer spring is set on the fixed mechanism, and the upper end of the buffer spring props up the described 5th and stops ring, Lower end props up the described 6th and stops ring.

Preferably, the fixed mechanism includes connector sleeve and connect cover,

The connector sleeve set is scheduled on the connecting rod, and the upper end of the connector sleeve has the first accommodating chamber, the reset bullet The lower end of spring props up the bottom of first accommodating chamber, has the described 6th to stop ring, institute on the side wall of the lower end of the connector sleeve State buffer spring to be set on the connector sleeve, the lower end of the connector sleeve has connection end；

The inner wall of the upper end of the connect cover is threadedly coupled with the connection end.

Preferably, the fixed mechanism further includes pushing part, the upper end of the pushing part is fixed with the connect cover to be connected Connect；

The upper end of the disk pawl tool has the first cylinder of inner hollow, and waist has the second cylinder of inner hollow Body, lower end have the 3rd cylinder of inner hollow, have first concave ring and described on the inner wall of first cylinder 4th stops ring.

Preferably, multiple tapped through holes are offered on the side wall of the pushing part, on the side wall of first cylinder With multiple waist through hole, the waist of the waist through hole is parallel with the telescopic direction of the piston, the pushing tow bolt thread It is connected in the tapped through hole, the end of the pushing tow bolt is inserted into the waist through hole.

Preferably, the housing includes

Upper casing, the upper casing inner hollow, the upper end of the upper casing has the upper end open, on the inner wall of the upper casing Stop ring with first；

Middle shell, the middle shell inner hollow, the upper end of the middle shell have described second to stop ring, and described second stops the outer of ring Wall is connected with the inner thread of the lower end of the upper casing；

Lower casing, the lower casing inner hollow, the upper end of the lower casing have the described 5th to stop ring, and the described 5th stops ring and institute The lower end for stating middle shell is fixedly connected.

Preferably, further including outer sliding sleeve and inner sliding sleeve, the outer sliding sleeve is fixedly connected with the inner wall of the middle shell, described There is card key on the side wall of connector sleeve, there is bayonet on the inner sliding sleeve, the card key is fastened in the bayonet, the interior cunning It is set on the connector sleeve.

Preferably, the upper end of the pushing tow head has only key, the lower end of the connecting rod has recess, and the only bond energy reaches It is fastened in the recess.

Preferably, the lower end of the pushing tow head has been wholely set the 4th cylinder, the outer wall energy of the 4th cylinder Enough inner rings for stopping ring with the described 4th are bonded；

The upper end of the pushing tow head has been wholely set the 5th cylinder, the outer wall of the 5th cylinder and the described first circle The inner wall fitting of cylinder, the only key are integrally disposed upon the upper end of the 5th cylinder.

Preferably, the pushing part is wholely set with the connect cover, the lower end of the piston has the second accommodating cavity.

The beneficial effects of the utility model are such a lid grasping mechanisms, first, by the setting of housing, realize fixed effect Fruit, by piston driving connecting rod and the pushing tow head of connecting rod lower end, pushing tow head acts on calvus, drives calvus to open and grabs Lid；

Then, calvus pushing tow bottle cap, jacking force are transferred to connect cover and connector sleeve successively, then drive compression to reset bullet Spring, action of reset spring drive adjusting nut to jack up, so as to drive pull rod to jack up, the 3rd of pull rod lower end stops in adjusting nut Annulus pawl piece recovers, promptly.

Brief description of the drawings

The utility model is further illustrated with reference to the accompanying drawings and examples.

Fig. 1 is a kind of structure diagram of the optimum embodiment of lid grasping mechanism of the utility model.

Fig. 2 is the structure diagram of the utility model upper casing.

Fig. 3 is the structure diagram of shell in the utility model.

Fig. 4 is the structure diagram of the utility model lower casing.

Fig. 5 is the structure diagram of the utility model piston.

Fig. 6 is the structure diagram of the utility model pushing tow head.

Fig. 7 is the structure diagram of the utility model pull rod.

Fig. 8 is the structure diagram of the utility model disk pawl tool.

Fig. 9 is the structure diagram of the optimum embodiment of the utility model fixed mechanism.

1, housing in figure, 1-1, upper casing, 1-2, middle shell, 1-3, lower casing, 1-1-1, upper end are open, and 1-1-2, first stop ring, 1-1-3, stroke chamber, the only ring of 1-2-1, second, the only ring of 1-3-1, the 5th, 2, piston, 2-1, the second accommodating cavity, 3, connecting rod, 4, Pushing tow head, 4-1, only key, 4-2, the 4th cylinder, 4-3, the 5th cylinder, 5, pull rod, the only ring of 5-1, the 3rd, 5-2, recess, 6, Fixed mechanism, 6-1, connector sleeve, 6-2, connect cover, 6-3, pushing part, 6-1-1, the 6th stop ring, 6-1-2, the first accommodating chamber, 6- 1-3, connection end, 6-1-4, card key, 6-3-1, pushing tow bolt, 7, adjusting nut, 8, resetting spring, 8-1, the first concave ring, 8- 2nd, the 4th only ring, 8-3, the first cylinder, 8-4, the second cylinder, 8-5, the 3rd cylinder, 9, calvus, 10, buffer spring, 11st, outer sliding sleeve, 12, inner sliding sleeve.

Embodiment

The embodiment of the utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning Same or similar element is represented to same or similar label eventually or there is same or like element.Below by ginseng The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and it is not intended that to the utility model Limitation.On the contrary, the embodiment of the utility model includes falling into owning in the range of the spirit and intension of attached claims Change, modification and equivalent.

In the description of the utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " axis To ", " radial direction ", the orientation of the instruction such as " circumferential direction " or position relationship be based on orientation shown in the drawings or position relationship, be only for Easy to the description present invention and simplify description, rather than instruction or imply that signified device or element there must be specific side Position, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.

In addition, term " first ", " second " etc. are only used for description purpose, and it is not intended that indicating or implying relatively important Property., it is necessary to which explanation, unless otherwise clearly defined and limited, term " connected ", " connect in the description of the utility model Connect " it should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or it is integrally connected；It can be machine Tool is connected or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary.For this area For those of ordinary skill, concrete meaning of the above-mentioned term in the utility model can be understood with concrete condition.In addition, in this reality With in new description, unless otherwise indicated, " multiple " are meant that two or more.

Any process or method described otherwise above description in flow chart or herein is construed as, and represents to include Module, fragment or the portion of the code of the executable instruction of one or more the step of being used for realization specific logical function or process Point, and the scope of the preferred embodiment of the utility model includes other realization, wherein can not press shown or discuss Order, including according to involved function by it is basic at the same time in the way of or in the opposite order, carry out perform function, this should be by this The embodiment person of ordinary skill in the field of utility model is understood.

As shown in Fig. 1 ~ 9, the utility model provides a kind of lid grasping mechanism, including：

Housing 1, the inner hollow of housing 1, the upper end opening 1-1-1 of housing 1 are used to ventilate, have on the inner wall of housing 1 First, which stops ring 1-1-2 and second, stops ring 1-2-1, and first stops the lower face of ring 1-1-2 between the second only upper surface of ring 1-2-1 With stroke chamber 1-1-3；By set first only ring 1-1-2 and second stop ring 1-2-1, the displacement of piston 2 is limited in the One only ring 1-1-2 and second stop ring 1-2-1 between.Play good limit effect.

Piston 2, piston 2 are slidably disposed in stroke chamber 1-1-3；

Connecting rod 3, piston 2 are fixed on the upper end of connecting rod 3；There is a through hole, 2 sets of piston is scheduled on connection on piston 2 On bar 3, piston 2 is coaxially fixed with connecting rod 3.

Pushing tow first 4, pushing tow first 4 are round estrade, and pushing tow first 4 is fixed on the lower end of connecting rod 3；The big disc of pushing tow first 4 is set Put and refer in upper end, big disc herein：Because round estrade has two circular bottom surfaces, a diameter is big, and a diameter is small, And be big disc referred to herein as a bottom surface being relatively large in diameter, then small disc is the less bottom surface of diameter, and big disc is set In upper end, small disc is arranged on lower end.

Pull rod 5, pull rod 5 are tubulose, have the 3rd to stop ring 5-1, the side of the upper end of pull rod 5 on the side wall of the lower end of pull rod 5 Wall, which is got on the bus, the first screw thread wire casing, and pull rod 5 is set in connecting rod 3, and connecting rod 3 can be slided up and down relative to pull rod 5, pull rod 5 are located at the top of pushing tow first 4；

Fixed mechanism 6,6 sets of fixed mechanism, which is scheduled on the first screw thread wire casing and the 3rd, to be stopped on the pull rod 5 between ring 5-1；

Adjusting nut 7, adjusting nut 7 are threaded on the first screw thread wire casing；By adjusting the position of adjusting nut 7, It can set resetting spring 8 that there is different elasticity.

Resetting spring 8, resetting spring 8 are set on pull rod 5, and the upper end of resetting spring 8 props up adjusting nut 7, and lower end is supported Firmly fixed mechanism 6；

Multiple calvus 9, multiple calvus 9 form disk pawls tool, have the first concave ring 8-1 on the inner wall of disk pawl tool, and the 3rd Only ring 5-1 is fastened in the first concave ring 8-1, has the 4th to stop ring 8-2 on the inner wall of disk pawl tool, the 4th stops the upper end of ring 8-2 Face can be bonded with the side wall of pushing tow first 4, and the 4th upper surface for stopping ring 8-2 can be bonded with the side wall of pushing tow first 4 can be fine Ensure its effect with pushing tow.The upper surface of disk pawl tool is bonded with the lower face of fixed mechanism 6.

Such a lid grasping mechanism further includes buffer spring 10, has the 5th to stop ring 1-3-1, fixed mechanism 6 on the inner wall of housing 1 Side wall on have the 6th only ring 6-1-1；

Buffer spring 10 is set on fixed mechanism 6, and the upper end of buffer spring 10 props up the 5th and stops ring 1-3-1, and lower end is supported Firmly the 6th stops ring 6-1-1.

Fixed mechanism 6 includes connector sleeve 6-1 and connect cover 6-2,

Connector sleeve 6-1 sets are scheduled on connecting rod, and the upper end of connector sleeve 6-1 has the first accommodating chamber 6-1-2, resetting spring 8 Lower end props up the bottom of the first accommodating chamber 6-1-2, has the 6th to stop ring 6-1-1, buffering elastic on the side wall of the lower end of connector sleeve 6-1 Spring 10 is set on connector sleeve 6-1, and the lower end of connector sleeve 6-1 has connection end 6-1-3；By setting the first accommodating chamber 6-1- 2, it can ensure that the compression of resetting spring 8 is not in inclined situation to a certain extent.

The inner wall of the upper end of connect cover 6-2 is threadedly coupled with connection end 6-1-3, the upper surface of disk pawl tool and connect cover The lower face fitting of 6-2.

Fixed mechanism 6 further includes pushing part 6-3, and the upper end of pushing part 6-3 is fixedly connected with connect cover 6-2；

The upper end of disk pawl tool has the first cylinder 8-3 of inner hollow, and waist has the second cylinder of inner hollow Body 8-4, lower end have the 3rd cylinder 8-5 of inner hollow, have on the inner wall of the first cylinder 8-3 the first concave ring 8-1 and 4th stops ring 8-2.

Multiple tapped through holes are offered on the side wall of pushing part 6-3, there are multiple kidney-shapeds on the side wall of the first cylinder 8-3 Through hole, the waist of waist through hole is parallel with the telescopic direction of piston 2, and pushing tow bolt 6-3-1 is threaded in tapped through hole, top In the end insertion waist through hole for pushing away bolt 6-3-1.By such a design, when calvus 9 is in opening and closure, pass through Waist through hole can play good position-limiting action, prevent the situation of displacement.

Housing 1 includes

Upper casing 1-1, upper casing 1-1 inner hollows, the upper end of upper casing 1-1 have upper end opening 1-1-1, the inner wall of upper casing 1-1 It is upper to have first to stop ring 1-1-2；

Middle shell 1-2, middle shell 1-2 inner hollows, the upper end of middle shell 1-2 have second to stop ring 1-2-1, and second stops ring 1-2-1 Outer wall be connected with the inner thread of the lower end of upper casing 1-1；

Lower casing 1-3, lower casing 1-3 inner hollows, the upper end of lower casing 1-3 have the 5th to stop ring 1-3-1, and the 5th stops ring 1-3-1 It is fixedly connected with the lower end of middle shell 1-2.

Such a lid grasping mechanism further includes outer sliding sleeve 11 and inner sliding sleeve 12, and outer sliding sleeve 11 is fixedly connected with the inner wall of middle shell 1-2, There is card key 6-1-4 on the side wall of connector sleeve 6-1, there is bayonet on inner sliding sleeve 12, card key 6-1-4 is fastened in bayonet, interior cunning Set 12 is set on connector sleeve 6-1.By setting outer sliding sleeve 11 and inner sliding sleeve 12, can be very good protection connector sleeve 6-1 with And the inner wall of middle shell 1-2.Also act certain fixed effect at the same time.

The upper end of pushing tow first 4, which has, stops key 4-1, and the lower end of connecting rod has recess 5-2, and only key 4-1 can be fastened on recess In 5-2.The only setting of key 4-1, can play certain transition guiding protective effect, while can also play for pushing tow first 4 Position-limiting action.

The lower end of pushing tow first 4 has been wholely set the 4th cylinder 4-2, and the outer wall of the 4th cylinder 4-2 can stop with the 4th The inner ring fitting of ring 8-2；Such a design, easy to play good position-limiting action.

The upper end of pushing tow first 4 has been wholely set the 5th cylinder 4-3, the outer wall and the first cylinder of the 5th cylinder 4-3 The inner wall fitting of 8-3, stops the upper end that key 4-1 is integrally disposed upon the 5th cylinder 4-3.

Pushing part 6-3 is wholely set with connect cover 6-2, and the lower end of the piston 2 has the second accommodating cavity 2-1.Set herein The second accommodating cavity 2-1 is put, is to during piston 2 is flexible, the upper end of adjusting nut 7 and pull rod 5 be accommodated, so as to subtract The stroke of small stroke cylinder.

When starting to work, first, external equipment is ventilated from upper end opening 1-1-1, promotes piston 2 in stroke chamber 1- Slided in 1-3, piston 2 drive connecting rod 3 move downward, when pushing tow first 4 side wall with the 4th stop ring 8-2 upper-end contact offset When, the 4th cylinder 4-2 is fastened in the 4th inner ring for stopping ring 8-2, continues pushing tow, and multiple calvus 9 are opened.

Then, bottle cap gos deep into calvus 9, and bottle cap and 9 phase top of calvus produce jacking force, jacking force by pushing part 6-3 successively It is delivered at connect cover 6-2 and connector sleeve 6-1, connector sleeve 6-1 extrudes buffer spring under the action of the 6th only ring 6-1-1 10, play good buffering effect.

Then, jacking force continues to be transferred to resetting spring 8, the compression of resetting spring 8 and pushing tow adjusting nut 7, adjusting nut 7 Drive pull rod 5 above carry because the lower end of pull rod 5 have the 3rd only ring 5-1, and the 3rd only ring 5-1 be fastened on the first concave ring 8-1 In, so as to drive calvus 9 to firmly grasp bottle cap.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of the term State and may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be Combined in an appropriate manner in any one or more embodiments or example.

Using the above-mentioned desirable embodiment according to the utility model as enlightenment, pass through above-mentioned description, related work people Member can carry out various changes and amendments in the range of without departing from this item utility model technological thought completely.This item is real The content being not limited to new technical scope on specification, it is necessary to which its technology is determined according to right Property scope.

Claims (10)

1. A kind of 1. lid grasping mechanism, it is characterised in that：Including：

   Housing, the inner hollow of the housing, the upper end of the housing is open to be used to ventilate, and has the on the inner wall of the housing One only ring and second only ring, described first only ring lower face to described second stop ring upper surface between there is stroke chamber；

   Piston, the piston are slidably disposed in the stroke chamber；

   Connecting rod, the piston are fixed on the upper end of the connecting rod；

   Pushing tow head, the pushing tow head are round estrade, and the pushing tow head is fixed on the lower end of the connecting rod；

   Pull rod, the pull rod are tubulose, have the 3rd to stop ring, the side of the upper end of the pull rod on the side wall of the lower end of the pull rod Wall, which is got on the bus, the first screw thread wire casing, and the pull rod is set in the connecting rod, and the pull rod is located at the top of the pushing tow head；

   Fixed mechanism, the fixed mechanism set are scheduled on the first screw thread wire casing and the described 3rd only pull rod between ring On；

   Adjusting nut, the adjusting nut are threaded on the first screw thread wire casing；

   Resetting spring, the resetting spring are set on the pull rod, and the upper end of the resetting spring props up the adjusting nut, Lower end props up the fixed mechanism；

   Multiple calvus, multiple calvus form disk pawls tool, have the first concave ring on the inner wall of the disk pawl tool, and described the Three, which stop ring, is fastened in first concave ring, has the 4th to stop ring on the inner wall of the disk pawl tool, the described 4th stops the upper of ring End face can be bonded with the side wall of the pushing tow head, the upper surface of the disk pawl tool and the lower end face paste of the fixed mechanism Close.
2. 2. lid grasping mechanism as claimed in claim 1, it is characterised in that：Buffer spring is further included, is had on the inner wall of the housing There is the 5th to stop ring, have the 6th to stop ring on the side wall of the fixed mechanism；

   The buffer spring is set on the fixed mechanism, and the upper end of the buffer spring props up the described 5th and stops ring, lower end Prop up the described 6th and stop ring.
3. 3. lid grasping mechanism as claimed in claim 2, it is characterised in that：The fixed mechanism includes connector sleeve and connect cover,

   The connector sleeve set is scheduled on the connecting rod, and the upper end of the connector sleeve has the first accommodating chamber, the resetting spring Lower end props up the bottom of first accommodating chamber, has the described 6th to stop ring on the side wall of the lower end of the connector sleeve, described slow Rush spring to be set on the connector sleeve, the lower end of the connector sleeve has connection end；

   The inner wall of the upper end of the connect cover is threadedly coupled with the connection end.
4. 4. lid grasping mechanism as claimed in claim 3, it is characterised in that：The fixed mechanism further includes pushing part, the pushing tow The upper end in portion is fixedly connected with the connect cover；

   The upper end of the disk pawl tool has the first cylinder of inner hollow, and waist has the second cylinder of inner hollow, Lower end has the 3rd cylinder of inner hollow, has first concave ring and the described 4th on the inner wall of first cylinder Only ring.
5. 5. lid grasping mechanism as claimed in claim 4, it is characterised in that：Multiple screw threads are offered on the side wall of the pushing part to lead to Hole, has multiple waist through hole on the side wall of first cylinder, and the waist of the waist through hole is flexible with the piston Direction is parallel, and the pushing tow bolt thread is connected in the tapped through hole, and the kidney-shaped is inserted into the end of the pushing tow bolt In through hole.
6. 6. lid grasping mechanism as claimed in claim 5, it is characterised in that：The housing includes

   Upper casing, the upper casing inner hollow, the upper end of the upper casing have the upper end open, have on the inner wall of the upper casing First stops ring；

   Middle shell, the middle shell inner hollow, the upper end of the middle shell have the described second only ring, described second only the outer wall of ring with The inner thread connection of the lower end of the upper casing；

   Lower casing, the lower casing inner hollow, the upper end of the lower casing have a described 5th only ring, the described 5th only ring with it is described in The lower end of shell is fixedly connected.
7. 7. lid grasping mechanism as claimed in claim 6, it is characterised in that：Further include outer sliding sleeve and inner sliding sleeve, the outer sliding sleeve with The inner wall of the middle shell is fixedly connected, and has card key on the side wall of the connector sleeve, has bayonet, the card on the inner sliding sleeve Key is fastened in the bayonet, and the inner sliding sleeve is set on the connector sleeve.
8. 8. lid grasping mechanism as claimed in claim 7, it is characterised in that：The upper end of the pushing tow head has only key, the connecting rod Lower end there is recess, the only bond energy is enough fastened in the recess.
9. 9. lid grasping mechanism as claimed in claim 8, it is characterised in that：The lower end of the pushing tow head has been wholely set the 4th cylinder Body, the outer wall of the 4th cylinder can be bonded with the inner ring of the described 4th only ring；

   The upper end of the pushing tow head has been wholely set the 5th cylinder, outer wall and first cylinder of the 5th cylinder Inner wall fitting, the only key is integrally disposed upon the upper end of the 5th cylinder.
10. 10. lid grasping mechanism as claimed in claim 9, it is characterised in that：The pushing part is wholely set with the connect cover, institute The lower end for stating piston has the second accommodating cavity.