CN209041214U - Cylinder - Google Patents

Abstract

The utility model proposes a kind of cylinders, including cylinder body, Strok mechanism and drive shaft, cylinder body includes ontology, first end cover and second end cover, ontology offers the first accommodating chamber and the second accommodating chamber, first accommodating chamber is located at close to one end of first end cover, the diameter of first accommodating chamber is less than the second accommodating chamber, ontology is additionally provided with the first venthole, second venthole and third venthole, first venthole connects the first accommodating chamber close to one end of first end cover, second venthole connects the one end of the first accommodating chamber far from first end cover, third venthole connects the one end of the second accommodating chamber far from first end cover, Strok mechanism includes first piston and second piston, second piston includes the second main part, second convex extension part and the second limiting section, second main part is set in the second accommodating chamber, first piston is sheathed on the second limiting section, drive shaft is fixed on On first piston and pass through first end cover.The air cylinder structure of the utility model is simple, stroke is more.

Description

Cylinder

Technical field

The utility model relates to a kind of cylinder more particularly to a kind of multirow stroke cylinders.

Background technique

Existing multirow stroke cylinder generallys use multiple cylinder body sockets, and cylinder body is pushed to be stretched out one by one to reach multiple-pass Effect.However this air cylinder structure is complex, each cylinder body must connect external gas circuit, and need to guarantee air-tightness.Stroke Its structure of more cylinders is about complicated, leads to that its volume is big, manufacturing cost is high, and is easily damaged.

Utility model content

In view of this, it is necessary to provide a kind of cylinders of the simple multiple-pass of structure to solve the above problems.

A kind of cylinder, including cylinder body, Strok mechanism and drive shaft, the cylinder body include ontology and are covered on the ontology two respectively The first end cover and second end cover at end, the ontology at least offer the first accommodating chamber and the second accommodating chamber being connected, this first Accommodating chamber is located at close to one end of the first end cover, and the diameter of first accommodating chamber is less than second accommodating chamber, and the ontology is also extremely Be equipped with the first venthole, the second venthole and third venthole less, first venthole connect first accommodating chamber close to this One end of one end cap, second venthole connect the one end of first accommodating chamber far from the first end cover, which connects Connect the one end of second accommodating chamber far from the first end cover, the trip mechanism includes at least first piston and second piston, this Two pistons include being sequentially connected and the second main part, the second convex extension part and the second limiting section that diameter is sequentially reduced, this is second main Body portion is actively set in second accommodating chamber and supports the cavity wall of the second accommodating chamber, second convex extension part and second limiting section It can extend into first accommodating chamber, which is actively sheathed on second limiting section, which fixes In on the first piston and its other end pass through the first end cover.

Further, which is additionally provided with third accommodating chamber, the third accommodating chamber be connected to second accommodating chamber far from this One end of one accommodating chamber, the diameter of the third accommodating chamber are greater than second accommodating chamber, which is additionally provided with the 4th venthole, this Four ventholes connect the one end of the third accommodating chamber far from second accommodating chamber, and the trip mechanism further includes third piston, this Three pistons include third main part and third convex extension part, which is actively set in the third accommodating chamber, this Three convex extension parts can extend into second accommodating chamber.

Further, which is additionally provided with the 4th accommodating chamber, the 4th accommodating chamber be connected to the third accommodating chamber far from this One end of one accommodating chamber, the diameter of the 4th accommodating chamber are greater than the third accommodating chamber, which is additionally provided with the 5th venthole, this Five ventholes connect the 4th one end of accommodating chamber far from second accommodating chamber, and the trip mechanism further includes the 4th piston, this Four pistons include the 4th main part and the 4th convex extension part, and the 4th main part is actively set in the 4th accommodating chamber, this Three convex extension parts can extend into the third accommodating chamber.

Further, which further includes that the third set on the third convex extension part away from the third main part one end limits Position portion, the 4th piston further include the 4th limiting section for deviating from the 4th main part one end set on the 4th convex extension part, this second Piston is actively sheathed on the third limiting section, which is actively sheathed on the 4th limiting section.

Further, the gag lever post that one end of the second end cover towards the 4th main part is equipped with, the activity of the 4th piston Ground is sheathed on the gag lever post.

Further, the cross section of second limiting section, the third limiting section, the 4th limiting section and the gag lever post is in D Type.

Further, which is equipped with along its axially extending limit hole, which, which is equipped with, fixes Bar, the fixed link pass through the limit hole.

Further, the trip mechanism further includes elastic component and baffle, which is actively sheathed on second limiting section It goes up and is located between the first piston and second convex extension part, which flexibly supports the second piston and the gear respectively Plate.

Further, which connects a fixed link, and the fixed link is also cross the limit hole.

First piston is actively sheathed on the second limiting section by the cylinder of the utility model, by driving first piston with Second piston is moved to different location and realizes multiple strokes so that drive shaft is extend out to different location.The cylinder of the utility model/ Structure is simple, and stroke is more.

Detailed description of the invention

Fig. 1 is the stereoscopic schematic diagram of the cylinder of the utility model embodiment one.

Fig. 2 is the decomposition diagram of cylinder shown in Fig. 1.

Fig. 3 is cross-sectional view of the cylinder shown in Fig. 1 along III-III line.

Fig. 4 is the cross-sectional view under another state of cylinder shown in Fig. 3.

Fig. 5 is the cross-sectional view under another state of cylinder shown in Fig. 3.

Fig. 6 is the cross-sectional view under another state of cylinder shown in Fig. 3.

Fig. 7 is the cross-sectional view under another state of cylinder shown in Fig. 3.

Fig. 8 is the cross-sectional view under another state of cylinder shown in Fig. 3.

Fig. 9 is the cross-sectional view under another state of cylinder shown in Fig. 3.

Figure 10 is the cross-sectional view under another state of cylinder shown in Fig. 3.

Figure 11 is the decomposition diagram of the cylinder of the utility model embodiment two.

Figure 12 is the cross-sectional view of the cylinder of the utility model embodiment two.

Figure 13 is the cross-sectional view under another state of cylinder shown in Figure 12.

Figure 14 is the cross-sectional view under another state of cylinder shown in Figure 12.

Figure 15 is the cross-sectional view under another state of cylinder shown in Figure 12.

Figure 16 is the cross-sectional view under another state of cylinder shown in Figure 12.

Figure 17 is the cross-sectional view under another state of cylinder shown in Figure 12.

Figure 18 is the cross-sectional view under another state of cylinder shown in Figure 12.

Figure 19 is the cross-sectional view under another state of cylinder shown in Figure 12.

Figure 20 is the cross-sectional view under another state of cylinder shown in Figure 12.

Main element symbol description

The following detailed description will be further explained with reference to the above drawings the utility model.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model It clearly and completely describes, it is clear that described embodiment is only the utility model a part of the embodiment, rather than whole realities Apply example.Based on the embodiments of the present invention, those of ordinary skill in the art institute without making creative work The all other embodiment obtained, fall within the protection scope of the utility model.

It should be noted that it can be directly to separately when an element is considered as " connection " another element One element may be simultaneously present the element being centrally located.When an element is considered as " setting exists " another element, It, which can be, is set up directly on another element or may be simultaneously present the element being centrally located.

Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein includes Any and all combinations of one or more related listed items.

It please refers to Fig.1 to Fig.3, the utility model embodiment one provides a kind of cylinder 100.Cylinder 100 includes cylinder body 10, lives It is set to the Strok mechanism 20 in cylinder body 10 and the drive shaft 30 on Strok mechanism 20 dynamicly.

Cylinder body 10 includes ontology 11 and the first end cover 12 and second end cover 13 for being covered on 11 both ends of ontology respectively.Ontology Run through in 11 and offers the first accommodating chamber 112, the second accommodating chamber 114, third accommodating chamber 116 and the 4th coaxial and be sequentially communicated Accommodating chamber 118.First accommodating chamber 112 is located at close to one end of first end cover 12.First accommodating chamber 112, the second accommodating chamber 114, The diameter of third accommodating chamber 116 and the 4th accommodating chamber 118 successively becomes larger.The first venthole 1112, second is additionally provided on ontology 11 Venthole 1114, third venthole 1116, the 4th venthole 1118 and the 5th venthole 1119.First venthole 1112, second Venthole 1114, third venthole 1116 and the 4th venthole 1118 respectively with the first accommodating chamber 112, the second accommodating chamber 114 Three accommodating chambers 116 and the 4th accommodating chamber 118 are connected to close to one end of first end cover 13；5th venthole 1119 and the 4th accommodating chamber 118 are connected to close to one end of second end cover 13.

Strok mechanism 20 includes first piston 212, second piston 214, third piston 216 and the 4th piston 218.First Piston 212, second piston 214, third piston 216 and the 4th piston 218 are actively set to the first accommodating chamber 112, second respectively In accommodating chamber 114, third accommodating chamber 116 and the 4th accommodating chamber 118.

30 one end of drive shaft is set on first piston 212, and the other end passes through first end cover 12.

The structure of second piston 214, third piston 216 and the 4th piston 218 is roughly the same.Second piston 214 include according to The second main part 2141, the second convex extension part 2143 and the second limiting section 2145 of secondary connection.Second main part 2141, second is convex The diameter of extending portion 2143 and the second limiting section 2145 is sequentially reduced.Second main part 2141 is actively set to the second accommodating chamber 114 In and support the cavity wall of the second accommodating chamber 114 and separate the second accommodating chamber 114.Second convex extension part 2143 and the second limiting section 2145 It can extend into the first accommodating chamber 112.The sum of second main part 2141 and the axial length of the second convex extension part 2143 are received with second The axial length of cavity 114 is identical.

Third piston 216 includes third main part 2161, third convex extension part 2163 and third limiting section 2165.Third main body Portion 2161 is actively set in third accommodating chamber 116.The sum of the axial length of third main part 2161 and third convex extension part 2163 It is identical as the axial length of third accommodating chamber 116.

4th piston 218 includes the 4th main part 2181, the 4th convex extension part 2183 and the 4th limiting section 2185.4th main body Portion 2181 is actively set in the 4th accommodating chamber 118.The sum of the axial length of 4th main part 2181 and the 4th convex extension part 2183 It is identical as the axial length of third accommodating chamber 118.

First piston 212 is actively sheathed on the second limiting section 2145.Second piston 214 is actively sheathed on third On limiting section 2165, third piston 216 is actively sheathed on the 4th limiting section 2185.Second end cover 13 is towards the 4th main part 2181 one end is equipped with gag lever post 131.4th piston 218 is actively sheathed on gag lever post 131.Second limiting section 2145, The cross section of three limiting sections 2165, the 4th limiting section 2185 and gag lever post 131 is substantially in D type, keeps second end cover 13, first living It is rotation stop connection between plug 212, second piston 214, third piston 216 and the 4th piston 218, to limit output shaft 30 Rotation.It is appreciated that in other embodiments, if you do not need to limitation output shaft 30 rotates, third limiting section the 2165, the 4th Limiting section 2185 and gag lever post 131 can be omitted.

Second limiting section 2145 is equipped with along its axially extending limit hole 2147.It is fixed on first piston 212 Bar 2121, fixed link 2121 are arranged in limit hole 2147 simultaneously to limit shifting of the first piston 212 with respect to the second limiting section 2145 Dynamic distance.It is appreciated that in other embodiments, fixed link 2121 can be omitted with limit hole 2147, be otherwise attached to First piston 212 and the second limiting section 2145, for example, in the end of the second limiting section 2145 setting stop part with backstop first Piston 212 etc..

Referring to Fig. 3, defining first piston 212 can be relative to the movement of the second limiting section 2145 for convenient for subsequent descriptions Maximum distance, the i.e. axial length of limit hole 2147 are first stroke A.The maximum distance that second piston 214 can move axially For second stroke B.The maximum distance that third piston 216 can move axially is third trip C.4th piston 218 is mobile most Big distance is fourth stroke D.

Due to the first accommodating chamber 112, the second accommodating chamber 114, third accommodating chamber 116 and the 4th accommodating chamber 118 diameter according to Secondary to become larger, the thrust for the gas that first piston 212, second piston 214, third piston 216 and the 4th piston 218 are subject to is also successively Become larger.Therefore work as the first venthole 1112 and be passed through gas, while third venthole 1116, the 4th venthole 1118 or the 5th are logical When one of stomata 1119 is also passed into gas, third venthole 1116, the 4th venthole 1118 or the 5th venthole 1119 are logical The thrust that the gas entered applies is larger.For example, the 5th is logical when the 5th venthole 1119 and the first venthole 1112 are ventilated simultaneously The 4th piston 218 of gas-powered that stomata 1119 is passed through is mobile to 12 direction of first end cover, the gas that the first venthole 1112 is passed through Body drives first piston 212 mobile to 13 direction of second end cover, pushes second piston 214 mobile after first piston 212 is mobile, the Two pistons 214 push third piston 216 mobile, and third piston 216 supports the 4th piston 218 and applies to it to second end cover 216 The mobile power in direction.The gas that 5th venthole 1119 is passed through is greater than third piston 216 to the 4th to the thrust of the 4th piston 218 The thrust that piston 218 applies, is held in the 4th main part 2181 in the cavity wall of third accommodating chamber 116.

The case where first venthole 1112 is passed through gas with third venthole 1116 or the 4th venthole 1118 simultaneously and this Similar, details are not described herein again.

Referring to Fig. 3, gas push first piston 212 is to 13 direction of second end cover after the ventilation of the first venthole 1112 Mobile, first piston 212 successively pushes second piston 214, third piston 216 and the 4th piston 218 to 13 direction of second end cover Movement is until the 4th piston 218 is held in second end cover 13, and output shaft 30 is retracted mode at this time.

Referring to Fig. 4, when the first venthole 1112 and the 5th venthole 1119 are ventilated simultaneously, the 4th piston 218 is to the One end cap, 12 direction is mobile, what first piston 212, second piston 214 and third piston 216 were passed through in the first venthole 1112 Mobile towards 13 direction of second end cover under gas push, 30 outreach of output shaft is fourth stroke D at this time.

Referring to Fig. 5, when the first venthole 1112 and the 4th venthole 1118 are ventilated simultaneously, third piston 216 is to the One end cap, 12 direction is mobile, first piston 212 and second piston 214 court under the gas push that the first venthole 1112 is passed through 13 direction of second end cover is mobile, and 30 outreach of output shaft is third trip C at this time.

Referring to Fig. 6, when the first venthole 1112 and third venthole 11186 are ventilated simultaneously, second piston 216 is to the One end cap, 12 direction is mobile, and first piston 212 is mobile to 13 direction of second end cover, and 30 outreach of output shaft is the second row at this time Journey B.

Referring to Fig. 7, gas push second piston 214 is to 13 direction of second end cover when the ventilation of the second venthole 1114 It is mobile, and it is mobile to 12 direction of first end cover to push first piston 212 simultaneously, and the thrust that second piston 214 is subject to is larger, makes Second piston 214 is located at close to one end of second end cover 13, and 30 outreach of output shaft is first stroke A at this time.

Referring to Fig. 8, the 5th venthole 1119 is logical when the second venthole 1114 and the 5th venthole 1119 are ventilated simultaneously The 4th piston 218 of gas push entered is mobile to 12 direction of first end cover；The gas push first that second venthole 1114 is passed through Piston 212 is mobile to 12 direction of first end cover, and pushes second piston 214 and third piston 216 to 13 side of second end cover simultaneously To movement, the distance that output shaft 30 stretches out at this time is the sum of first stroke A and fourth stroke D.

Referring to Fig. 9, the 4th venthole 1118 is logical when the 4th venthole 1118 and the second venthole 1114 are ventilated simultaneously The gas push third piston 216 entered is mobile to 12 direction of first end cover；The gas push first that second venthole 1114 is passed through Piston 212 is mobile to 12 direction of first end cover, and pushes second piston 214 mobile to 13 direction of second end cover simultaneously, defeated at this time The distance that shaft 30 stretches out is the sum of first stroke A and third trip C.

Referring to Fig. 10, when the second venthole 1114 and third venthole 1116 are ventilated simultaneously, third venthole 1116 The gas push second piston 214 being passed through is mobile to 12 direction of first end cover；The gas push that second venthole 1114 is passed through One piston 212 is mobile to 12 direction of first end cover, the distance that output shaft 30 stretches out at this time be first stroke A and second stroke B it With.

It is appreciated that in other embodiments, the first accommodating chamber 112, the second accommodating chamber 114, the is at least arranged in cylinder body 10 One venthole 1112, the second venthole 1114 and third venthole 1116；Strok mechanism 20 includes at least first piston 212 and the Two pistons 214.

Figure 11 and Figure 12 is please referred to, the utility model embodiment two proposes a kind of cylinder 400.The structure and gas of cylinder 400 The structure of cylinder 100 is roughly the same comprising cylinder body 410, Strok mechanism 420 and drive shaft 430.Cylinder body 410 include ontology 411 and First end cover 412 and second end cover 413.The first accommodating chamber 4112, the second accommodating chamber 4114, third is equipped in ontology 411 to receive Cavity 4116 and the 4th accommodating chamber 4118.It is logical that the first venthole 4121, the second venthole 4142, third are additionally provided on ontology 411 Stomata 4163, the 4th venthole 4184 and the 5th venthole 4195.Strok mechanism 420 includes first piston 4212, second piston 4214, third piston 4216, the 4th piston 4218.Second piston 4214 includes the second main part 4141, the second convex extension part 4143 And second limiting section 4145.Third piston 4216 includes third main part 4161, third convex extension part 4163 and third limiting section 4165.4th piston 4218 includes the 4th main part 4181, the 4th convex extension part 4183 and the 4th limiting section 4185.

The difference of the cylinder 100 of the cylinder 400 and embodiment one of embodiment two is the stroke of the cylinder 400 of embodiment two Mechanism 420 includes elastic component 4219 and baffle 4191.

Second limiting section 4145 of second piston 4214 is again provided with along its axially extending limit hole 4147.Baffle 4191 It is actively sheathed on the second limiting section 4145.Baffle 4191 connects a fixed link 4181, and fixed link 4181 is also cross limit Hole 4147.4219 both ends of elastic component flexibly support second piston 4214 and baffle 4191 respectively.Baffle 4191 is by elastic component 4219 It supports, positioned at limit hole 4147 close to one end of first end cover 412.It is appreciated that in other embodiments, limit hole 4147 and Fixed link 4181 can be omitted, and be otherwise attached to baffle 4191 and the second limiting section 4145.

First piston 4212 is actively sheathed in second piston 4214, and is supported by baffle 4191.First piston 4212 It can be separated with baffle 4191.

Figure 12 is please referred to, is the convenient for subsequent descriptions, to define the maximum distance that first piston 4212 can move axially The maximum distance that one stroke E, second piston 4214 can move axially is second stroke F, third piston 4216 can be moved axially The maximum distance that dynamic maximum distance is third trip G, the 4th piston 4218 can move axially is fourth stroke H, limit hole 4167 axial length is fifth stroke I.

Figure 12 is please referred to, when the ventilation of the first venthole 4121, gas push first piston 4212 is to second end cover 413 Direction is mobile.First piston 4212 pushes 4191 compression elastic piece 4219 of baffle and successively pushes second piston 4214, third living Plug 4216 and the 4th piston 4218 are mobile towards 4123 direction of second end cover, and output shaft 30 is retracted mode at this time.

Please refer to Figure 13, when the 5th venthole 4195 and the first venthole 4121 are ventilated simultaneously, the 4th piston 4218 to 412 direction of first end cover is mobile, and first piston 4212, second piston 4214 and third piston 4216 are towards 413 side of second end cover To movement, 30 outreach of output shaft is fourth stroke H at this time.

Please refer to Figure 14, when the first venthole 4121 and the 4th venthole 4184 are ventilated simultaneously, third piston 4214 to 412 direction of first end cover is mobile, and first piston 4212 and second piston 4214 are pushed away in the gas that the first venthole 4121 is passed through Mobile towards 413 direction of second end cover under dynamic, 30 outreach of output shaft is third trip G at this time.

Please refer to Figure 15, when the first venthole 4121 and third venthole 4163 are ventilated simultaneously, second piston 4214 to 412 direction of first end cover is mobile, and first piston 4212 is mobile towards 413 direction of second end cover, and 30 outreach of output shaft is at this time Second stroke F.

Please refer to Figure 16, when the first venthole 4121 and the second venthole 4142 are ventilated simultaneously, second piston 4214 to 413 direction of second end cover is mobile, and the first venthole 4121 that first piston 4212 receives is passed through the thrust and the second ventilation of gas The thrust that hole 4142 is passed through gas is identical and contrary, therefore first piston 4212 is located at limit in the case where elastic component 4219 supports Hole 4167 is towards one end of first end cover 412, at this point, 30 outreach of output shaft is fifth stroke I.

Figure 17 is please referred to, when the first venthole 4121, the second venthole 4142 and the 5th venthole 4195 are ventilated simultaneously, 4th piston 4218 is located at close to one end of first end cover 412, and second piston 4214 is located at close to one end of second end cover 413, First piston 4212 is located at limit hole 4167 towards one end of first end cover 412, at this point, 30 outreach of output shaft is the 5th The sum of stroke I and fourth stroke H.

Figure 18 is please referred to, when the first venthole 4121, the second venthole 4142 and the 4th venthole 4184 are ventilated simultaneously, Third piston 4216 is located at close to one end of first end cover 412, and second piston 4214 is located at close to one end of second end cover 413, First piston 4212 is located at limit hole 4167 towards one end of first end cover 412, at this point, 30 outreach of output shaft is the 5th The sum of stroke I and third trip G.

Figure 19 is please referred to, when third venthole 4163 is ventilated, second piston 4214 is located at one close to first end cover 412 End, first piston 4212 are located at limit hole 4167 towards one end of first end cover 412, at this point, 30 outreach of output shaft is the The sum of five stroke I and second stroke F.

Figure 20 is please referred to, when the ventilation of the second venthole 4142, gas push first piston 4212 is held in first end cover 412, at this point, 30 outreach of output shaft is first stroke E.

First piston 212/4212 is actively sheathed on the second limiting section 2145/ by the cylinder 100/400 of the utility model On 4145, different location is moved to by drive shaft 30/ by driving first piston 212/4212 and second piston 214/4214 430, which extend out to different location, realizes multiple strokes.100/400 structure of cylinder of the utility model is simple, and stroke is more.

In addition, those skilled in the art can also do other variations within the spirit of the present invention, certainly, these are according to this reality The variation made of novel spirit should all be included in the utility model range claimed.

Claims (9)

1. a kind of cylinder, including cylinder body, Strok mechanism and drive shaft, which includes ontology and is covered on the ontology both ends respectively First end cover and second end cover, it is characterised in that: the ontology at least offer the first accommodating chamber being connected and second receiving Chamber, first accommodating chamber are located at close to one end of the first end cover, and the diameter of first accommodating chamber is less than second accommodating chamber, should For ontology also at least provided with the first venthole, the second venthole and third venthole, which connects first accommodating chamber Close to one end of the first end cover, which connects the one end of first accommodating chamber far from the first end cover, the third Venthole connects the one end of second accommodating chamber far from the first end cover, and the trip mechanism includes at least first piston and second and lives Plug, the second piston include being sequentially connected and the second main part, the second convex extension part and the second limiting section that diameter is sequentially reduced, should Second main part is actively set in second accommodating chamber and supports the cavity wall of the second accommodating chamber, second convex extension part and this second Limiting section can extend into first accommodating chamber, which is actively sheathed on second limiting section, the drive shaft one End is fixed on the first piston and its other end passes through the first end cover.

2. cylinder as described in claim 1, it is characterised in that: the ontology is additionally provided with third accommodating chamber, which connects Leading to the one end of second accommodating chamber far from first accommodating chamber, the diameter of the third accommodating chamber is greater than second accommodating chamber, this Body is additionally provided with the 4th venthole, and the 4th venthole connects the one end of the third accommodating chamber far from second accommodating chamber, the trip Mechanism further includes third piston, which includes third main part and third convex extension part, and the third main part is actively In the third accommodating chamber, which can extend into second accommodating chamber.

3. cylinder as claimed in claim 2, it is characterised in that: the ontology is additionally provided with the 4th accommodating chamber, and the 4th accommodating chamber connects Leading to the one end of the third accommodating chamber far from first accommodating chamber, the diameter of the 4th accommodating chamber is greater than the third accommodating chamber, this Body is additionally provided with the 5th venthole, and the 5th venthole connects the 4th one end of accommodating chamber far from second accommodating chamber, the trip Mechanism further includes the 4th piston, and the 4th piston includes the 4th main part and the 4th convex extension part, and the 4th main part is actively In the 4th accommodating chamber, which can extend into the third accommodating chamber.

4. cylinder as claimed in claim 3, it is characterised in that: the third piston further includes deviating to be somebody's turn to do set on the third convex extension part The third limiting section of third main part one end, the 4th piston further include being set to the 4th convex extension part away from the 4th main part one 4th limiting section at end, which is actively sheathed on the third limiting section, the third piston be actively sheathed on this Four limiting sections.

5. cylinder as claimed in claim 4, it is characterised in that: what one end of the second end cover towards the 4th main part was equipped with Gag lever post, the 4th piston are actively sheathed on the gag lever post.

6. cylinder as claimed in claim 5, it is characterised in that: second limiting section, the third limiting section, the 4th limiting section And the cross section of the gag lever post is in D type.

7. cylinder as described in claim 1, it is characterised in that: second limiting section is equipped with along its axially extending limit Hole, the first piston are equipped with fixed link, which passes through the limit hole.

8. cylinder as claimed in claim 7, it is characterised in that: the trip mechanism further includes elastic component and baffle, and the baffle is living It is sheathed on second limiting section and between the first piston and second convex extension part dynamicly, elastic component both ends bullet respectively Property supports the second piston and the baffle.

9. cylinder as claimed in claim 8, it is characterised in that: the baffle connects a fixed link, and the fixed link is also cross this Limit hole.