CN208951203U

CN208951203U - A kind of plunger type buffer unit

Info

Publication number: CN208951203U
Application number: CN201821176771.6U
Authority: CN
Inventors: 肖启瑞
Original assignee: Guangdong Mechanical and Electrical College
Current assignee: Guangdong Mechanical and Electrical College
Priority date: 2018-07-24
Filing date: 2018-07-24
Publication date: 2019-06-07
Anticipated expiration: 2028-07-24

Abstract

The utility model discloses a kind of plunger type buffer unit, and cylinder interior is equipped with epicoele, inner cavity and exocoel, and exocoel and inner cavity are led to by recirculation hole, and epicoele and inner cavity are led to by upper recirculation hole；Cylinder body outer peripheral surface is equipped with upper spring seat, plunger end is cased with lower spring cup, and cylinder body outer peripheral surface is equipped with the first spring, and plunger outer peripheral surface is equipped with curved indentations notch and can open or close recirculation hole, flow media can flow between three cavitys, and outer chamber is additionally provided with snubber elastomeric medium；Rubber spring is equipped with inside epicoele, pressure valve body is equipped in the middle part of epicoele, pressure valve body is nested with slide valve, slide valve bottom is equipped with second spring, the external circumferential surface of pressure valve is cased with third spring and is butted on top surface on cylinder body, slide valve is communicated with pressure valve body by channel, and horizontal baffle is equipped with unidirectional valve opening and communicates epicoele and inner cavity, and unidirectional valve opening can be opened or closed by valve block.The utility model has many advantages, such as multi-stage, efficient buffering, and the buffering and damping effect and adaptability of relief means can be improved.

Description

A kind of plunger type buffer unit

Technical field

The utility model relates to damping of shocks technical field, in particular to a kind of plunger type buffer unit.

Background technique

In the prior art, it is usually made of tractor and trailer for the heavy vehicle of cargo transport, however due to the two Weight is all very big, inevitably results from shock and vibration in tractor and trailer engaging process, especially works as tractor Back-up speed it is very fast when, shock and vibration active force when the two is quickly engaged is particularly evident.

To reduce shock and vibration, the prior art generallys use spring buffer or hydraulic buffer, wherein spring buffer Device merely uses spring to consume impact capacity, can only play certain buffer function, but weakening effect is poor；And it generally uses Hydraulic damper usually there is fixed damped coefficient, it is entire to engage damping characteristic in cushion stroke and fix, for that can not generate The changed damping characteristic with engagement stroke, and can not artificially be adjusted, therefore can not be extensively and reliable Ground is suitable for engaging the tractor and trailer engaging process of stroke.

Utility model content

The main purpose of the utility model is the plunger type buffer unit for proposing a kind of multi-stage, efficient buffering, it is intended to improve punching Hit the buffering and damping effect and adaptability of buffer unit.

To achieve the above object, the utility model proposes a kind of plunger type buffer unit, including internal be equipped with accommodating chamber The cylinder body of body, the cylinder interior is divided by horizontal baffle and circumferential bulkhead to be set to the epicoele on top, is set to lower part Inner cavity and exocoel, the exocoel is set to the lumen outer and the recirculation hole by being set to the circumferential bulkhead leads to, Upper recirculation hole is equipped in the middle part of the horizontal baffle to lead to the epicoele and the inner cavity；The inner cavity is axially arranged with column Plug, the cylinder body outer peripheral surface are equipped with cricoid upper spring seat, and the plunger end is cased with lower spring cup, the upper spring seat and institute It states and is placed on the cylinder body outer peripheral surface equipped with the first spring between lower spring cup, the plunger outer peripheral surface is equipped with curved indentations notch [arcuate structure diameter be less than diameter of plunger] can open or close the recirculation hole, the inner cavity, the exocoel and it is described on Intracavitary portion is equipped with flow media and flows between three cavitys, and the outer chamber is additionally provided with snubber elastomeric medium；The epicoele Internal circumferential is equipped with the rubber spring for radial energy storage, and the pressure of the salable upper recirculation hole in end is axially arranged in the middle part of the epicoele Valve body, the pressure valve body middle part is nested to be equipped with the slide valve being axially movable, and the slide valve bottom is supported equipped with second spring In top surface in the cylinder interior, the slide valve outer peripheral surface and installation block set inner peripheral surface match, and the pressure valve body is equipped with cavity The installation block set can be entangled, the external circumferential surface of pressure valve is cased with third spring and is butted on top surface on the cylinder body, the slide valve Bottom and the channel for being radially provided with connection are communicated with the channel that the pressure valve body is arranged radially, and the horizontal baffle is equipped with several Unidirectional valve opening communicates the epicoele and the inner cavity, and the valve block that the unidirectional valve opening can be axially displaced opens or closes, institute Valve block is stated to be connected by valve block end cap with the upper recirculation hole.

Preferably, several compressible closed cavities enclosed and be separated from each other, the rubber bullet are equipped with inside the rubber spring The part-structure outer profile of spring longitudinal section is hexagon.

Preferably, the inside initial end angle of the rubber spring be axially arranged with groove can be with the cylinder body inner top surface and described Horizontal baffle top surface negative-pressure adsorption.

Preferably, the pressure body base is conical surface, and the pressure valve body bottom part is inserted into the upper circulation The upper recirculation hole circumferential direction is sealed in hole.

Preferably, the stiffness factor of the third spring is greater than the stiffness factor of the second spring.

Preferably, the installation block set root is equipped with annular resilient pad and can offset with the slide valve top, the pressure valve The centre bore bottom edge of body is equipped with snap ring and carries out axial limiting to the slide valve.

Preferably, end cap is cased in the middle part of the plunger, the end cap outer peripheral surface and the cylinder ends are with convex block and groove Cooperation is connected, and the first sealing ring, the end cap and the cylinder body are equipped between the end cap inner peripheral surface and the plunger outer peripheral surface The second sealing ring is equipped between mutual cooperation position.

Preferably, the thickness of the valve block gradually becomes smaller from center to side edge, and the valve block is towards the inner cavity Surface is the curved surface from middle part to sides tapered.

Preferably, graphite copper sheathing is equipped between the plunger end outer peripheral surface and lower spring cup mutual cooperation position.

Technical solutions of the utility model have the advantage that compared with the prior art

When suffering reaction, plunger is moved to cylinder interior technical solutions of the utility model first, plunger The curved indentations notch of outer peripheral surface opens recirculation hole, and hydraulic oil enters in exocoel by recirculation hole from inner cavity, passes through exocoel In snubber elastomeric medium play certain energy storage effect, at the same time plunger operation front half section stroke to impact forces rise To lesser buffer function.After plunger constantly enters to cylinder interior, plunger outer peripheral surface will circulate bore closure, and hydraulic oil increases Slide valve is pushed up afterwards and is made slide valve and the channel of pressure valve body lead to, hydraulic oil enters to epicoele by above-mentioned channel Interior, hydraulic oil compresses to realize energy storage, by the lesser channel of bore to play quickly to impact forces rubber spring Buffering effect.When plunger, which passes through the first spring for covering outside rigid body, to be resetted, rubber spring restores and to being stored in epicoele Interior hydraulic oil is expelled in inner cavity, negative pressure appearance when plunger return is effectively relieved.Therefore technical solutions of the utility model By multi-stage buffering structure, adaptability, which is delayed, can be realized to impact forces using different dampings in the different trips stage Punching, thus tractor and trailer engaging process more extensive and that be readily applied to engagement stroke.

Technical solutions of the utility model pass through rotation adjustment plunger peace by the way that curved indentations notch is arranged in plunger outer peripheral surface Holding position, so that curved indentations notch is corresponding with different drag effect power in the different trips stage to recirculation hole.

In addition, circumferential inside the rubber spring of the present embodiment be equipped with multiple compressible closed cavities, and rubber spring is vertical After the part-structure outer profile in section is hexagon, therefore hydraulic oil enters to epicoele, compress by rubber spring can be produced Raw effective energy storage effect, can be filled with inside the compressible closed cavity inside rubber spring nitrogen or other safe gas with Enhance the structural strength of rubber spring.

The end cap inner peripheral surface of technical solutions of the utility model and plunger outer peripheral surface mutual cooperation position are equipped with the first sealing ring, And it is additionally provided with the second sealing ring between end cap and cylinder body mutual cooperation, so that being realized to plunger and cylinder interior preferable Sealing effect.

In addition, the plunger end outer peripheral surface of technical solutions of the utility model and lower spring cup mutual cooperation position are equipped with graphite Copper sheathing can play good friction, lubrication effect by graphite copper sheathing to the two.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.

Fig. 1 is the schematic diagram of internal structure of the utility model plunger type buffer unit；

Fig. 2 is the partial enlarged view in Fig. 1 at A；

Fig. 3 is the partial enlarged view in Fig. 1 at B；

Fig. 4 is the outline structural diagram of the utility model plunger.

Drawing reference numeral explanation:

Label	Title	Label	Title
				1	Cylinder body	2	Plunger
11	Epicoele	21	Curved indentations notch
				12	Inner cavity	3	First spring
13	Exocoel	4	Rubber spring
				131	Clay	41	Compressible closed cavity
14	Horizontal baffle	42	Groove
				141	Unidirectional valve opening	5	Pressure valve body
142	Upper recirculation hole	51	Snap ring
				15	Circumferential bulkhead	52	Third spring
151	Recirculation hole	6	Slide valve
				16	Upper spring seat	61	Second spring
17	End cap	7	Block set is installed
				171	First sealing ring	71	Annular resilient pad
172	Second sealing ring	8	Valve block
				18	Lower spring cup	9	Valve block end cap
181	Graphite copper sheathing	10	Channel

The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.

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 Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Under every other embodiment obtained, fall within the protection scope of the utility model.

It is to be appreciated that if related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding, Afterwards ...), then directionality instruction is only used for explaining opposite between each component under a certain particular pose (as shown in the picture) Positional relationship, motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.

In addition, if relating to the description of " first ", " second " etc. in the utility model embodiment, " first ", " the Two " etc. description is used for description purposes only, and is not understood to indicate or imply its relative importance or is implicitly indicated meaning The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one A this feature.It in addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill Based on personnel can be realized, this technical side will be understood that when the combination of technical solution appearance is conflicting or cannot achieve The combination of case is not present, also not within the protection scope of the requires of the utility model.

The utility model proposes a kind of plunger type buffer units.

Referring to Figure 1 to Fig. 4, in the utility model embodiment, plunger type buffer unit includes internal equipped with accommodating chamber The cylinder body 1 of body will be divided into epicoele inside cylinder body 1 by the circumferential bulkhead 15 that horizontal baffle 14 and circumference are arranged inside cylinder body 1 11, inner cavity 12 and exocoel 13, wherein epicoele 11 is set to 1 inner top of cylinder body, and exocoel 13 is then set to 12 outside of inner cavity and passes through The realization of recirculation hole 151 for being set to circumferential bulkhead 15 is mutually led to, and upper recirculation hole 142 is equipped in the middle part of horizontal baffle 14 by epicoele 11 Lead to inner cavity 12.Plunger 2, outer peripheral surface and the 12 inner peripheral surface phase of inner cavity of plunger 2 are axially arranged in the middle part of the inner cavity 12 of the present embodiment Match, 1 outer peripheral surface circumferential direction of cylinder body is equipped with upper spring seat 16, and the lower end of plunger 2 is then cased with lower spring cup 18, and upper spring seat 16 is under The outer peripheral surface that the first spring 3 is placed on cylinder body 1 is equipped between spring base 18, at the same time, the outer peripheral surface of plunger 2 is equipped with curved indentations Notch 21, and the curved surface diameter of curved indentations notch 21 be less than plunger 2 active section diameter, recirculation hole 151 can be opened or Person closes, so that the connection or closing between inner cavity 12 and exocoel 13 can be realized, in order to realize epicoele 11 inside cylinder body 1, Pressure change between inner cavity 12 and exocoel 13 is equipped with flow media between the epicoele 11 of the present embodiment, inner cavity 12 and exocoel 13 It is flowed between three cavitys with realizing, and the flow media of the present embodiment is selected as hydraulic oil.

In the present embodiment, inside exocoel 13 be equipped with for energy storage snubber elastomeric medium, due to clay elasticity it is larger and It is a kind of between gas, the chemical fluid substance of liquid, there is good buffering effect, therefore snubber elastomeric Jie of the present embodiment Matter is selected as clay 131, so that the volume between exocoel 13 and inner cavity 12 can change in a certain range.Separately Outside, it can be realized certain volume transformation to make epicoele 11 also and energy storage effect can be played, inside the epicoele 11 of the present embodiment It is arranged circumferentially the rubber spring 4 for radial energy storage, is equipped with what several circles were separated from each other inside the rubber spring 4 of the present embodiment Compressible closed cavity 41, and the part-structure outer profile of 4 longitudinal section of rubber spring is hexagonal, therefore enters from inner cavity 12 Hydraulic oil to epicoele 11 can make rubber spring 4 that longitudinal elastic compression occur by imposing radial forces to rubber spring 4 Deformation, and after hydraulic oil is flowed from epicoele 11 to inner cavity 12, rubber spring 4 can be sprung back in time quickly to be supplied with realizing Oil.The inside initial end angle of the rubber spring 4 of the present embodiment is axially arranged with groove 42 can be with 1 inner top surface of cylinder body and horizontal baffle 14 Top surface carries out negative-pressure adsorption, and the groove 42 being arranged by 4 end angle of rubber spring makes rubber spring 4 when by radial forces, It is deformed by groove 42 to be adsorbed to 1 inner top surface of cylinder body and 14 top surface of horizontal baffle, so that rubber spring 4 is to epicoele 11 Top and bottom generate good sealing effect.In addition, in compressible closed cavity 41 inside the rubber spring 4 of the present embodiment Portion can be filled with nitrogen or other safe gas to enhance the structural strength of rubber spring 4.

The pressure valve body 5 of the salable upper recirculation hole 142 in end is axially arranged in the middle part of the epicoele 11 of the present embodiment, pressure valve body 5 The slide valve 6 for being equipped with and being axially movable is inlayed at middle part, and 6 bottom of slide valve is butted on 1 inside of cylinder body equipped with second spring 61 and pushes up Face, 6 outer peripheral surface of slide valve and cricoid 7 inner peripheral surface of installation block set cooperate, and pressure valve body 6 is equipped with cavity and entangles installation block set 7, 5 outer peripheral surface of pressure valve body is cased with third spring 52 and is butted on inside cylinder body 1 top surface, and what 6 bottom of slide valve and being radially provided with was connected to leads to Road 10 is communicated with the channel 10 that pressure valve body 5 is arranged radially.5 bottom of pressure valve body of the present embodiment is conical surface, therefore pressure valve body 5 Part-structure be inserted into recirculation hole 16 to carry out circumferential sealing to upper recirculation hole 16.In addition, the strength of third spring 52 The stiffness factor that coefficient is greater than second spring 61 is spent, so that entering to the hydraulic oil of epicoele 11 first to slide valve from inner cavity 12 Body 6 imposes upward active force, so that the channel of 6 bottom of slide valve is connected with the channel that pressure valve body 5 is arranged radially, therefore Pressure change inside inner cavity 12 is in slow linear change, and after hydraulic fluid pressure is excessive, then made by biggish pressure Pressure valve body 5 moves up, and pressure oil more in this way enters in epicoele 11, to realize the quick reduction of pressure.

In the present embodiment, in order to which the stroke to slide valve 6 control effectively, in 7 root of installation block set of the present embodiment Equipped with annular resilient pad 71 can with offset at the top of slide valve 6, and to be additionally provided with snap ring 51 right for the centre bore bottom edge of pressure valve body 5 Slide valve 6 carries out axial limiting, to limit the axial movement distance of slide valve 6.

End cap 17 is cased in the middle part of the plunger 2 of the present embodiment, and 17 outer peripheral surface of end cap and 1 end of cylinder body are with convex block and groove Cooperation is connected, and 17 inner peripheral surface of end cap and 2 outer peripheral surface mutual cooperation position of plunger are equipped with the first sealing ring 171, and end cap 17 It is additionally provided with the second sealing ring 172 between cylinder body mutual cooperation, so that preferable to realizing inside plunger 2 and cylinder body 1 Sealing effect.

The horizontal baffle 14 of the present embodiment is additionally provided with several unidirectional valve openings 141 and epicoele 11 and inner cavity 12 is interconnected, And the valve block 8 that unidirectional valve opening 141 can be axially displaced turns on or off, and valve block 8 passes through valve block end cap 9 and upper circulation Hole 142 carries out connected, and the thickness of the present embodiment valve block 8 gradually becomes smaller from center to side edge, table of the valve block 8 towards inner cavity 12 Face is the curved surface from middle part to sides tapered.9 outer periphery of valve block end cap of the present embodiment is along U-type groove is equipped with, to may make dress It carries out Quick fastening or unscrewing in U-type groove with being convenient to be inserted into using specific purpose tool in the process.When hydraulic oil is from inner cavity 12 When into epicoele 11, the hydraulic oil with certain pressure pushes valve block 8 to horizontal baffle 14, so that unidirectional valve opening 141 is closed, Hydraulic oil can only enter in epicoele 11 from the channel of slide valve 6 first, when the pressure value of hydraulic oil increases to can be by pressure valve body 5 When pushing open upwards, hydraulic oil can be entered in epicoele 11 by upper recirculation hole 142 and the circular conical surface of 5 bottom of pressure valve body.And it is hydraulic When oil enters to inner cavity 12 from epicoele 11, hydraulic oil is pushed valve block 8 open to 12 direction of inner cavity by unidirectional valve opening 141, hydraulic oil Inner cavity 12 can be rapidly introduced into.And curved surface is set by the surface of valve block 8 towards inner cavity 12, so that hydraulic oil is to valve block 8 realize preferably promotion effect.

In the present embodiment, 2 end outer peripheral surface of plunger and 18 mutual cooperation position of lower spring cup are equipped with graphite copper sheathing 181, by In the curved indentations notch 21 for being set to 2 outer peripheral surface of plunger can be realized recirculation hole 151 is closed or is partially opened or Person fully opens, and by rotary plunger 2, make plunger 2 to flow orifice 151 close or open certain area after become Change, to generate different circulation effects.Therefore lower spring cup 18 is to be socketed the pass that is connected with 2 end outer peripheral surface of plunger by the present embodiment System may make plunger 2 easily to carry out turn, be equipped with graphite copper sheathing 181 between the two mutual cooperation position, can be to the two Play good friction, lubrication effect.

Referring to Figure 1 to Fig. 4, the working principle of the plunger type buffer unit of the present embodiment are as follows:

The plunger type buffer unit of the present embodiment for tractor and trailer be connected with each other between buffering, when tractor and It is close to each other and when carrying out connected between trailer, can the plunger type buffer unit to the present embodiment generate greater impact active force, Make plunger 2 to being moved inside cylinder body 1, at the same time, the first spring 3 also will receive corresponding impact forces and generate pressure Compression deformation.When plunger 2 is right against recirculation hole 151 to the curved indentations notch 21 for carrying out mobile and 2 outer peripheral surface of plunger inside cylinder body 1 When, i.e. recirculation hole 151 not closed by 2 outer peripheral surface of plunger so that hydraulic oil from inner cavity 12 by recirculation hole 151 and Enter to exocoel 13, the clay 131 inside exocoel 13 will occur compress and generate energy storage effect, and with plunger 2 gradually into When entering to 12 inside of inner cavity, the too small and insufficient pressure inside inner cavity 12 is pushed away with pushing slide valve 6 and pressure valve body 5 to epicoele Open, hydraulic oil can not enter to epicoele 11 from inner cavity 12 at this time, plunger 2 carry out buffer function damping action power is smaller and column Plug 2 is smaller to the energy of impact forces buffering consumption in leading portion stroke.

As plunger 2 constantly enters inside cylinder body 1, the curved indentations notch 21 on 2 surface of plunger is gradually distance from recirculation hole 151, and 2 outer peripheral surface of plunger gradually closes recirculation hole 151, and after plunger 2 constantly enters 1 inside of cylinder body, in inner cavity 12 Pressure value constantly increase, since the stiffness factor of second spring 61 is smaller than the stiffness factor of third spring 52, so that liquid 10 phase of channel that pressure oil pushes slide valve 6 to move up and be arranged radially up to the channel 10 of slide valve 6 with pressure valve body 5 first Even, hydraulic oil can be entered to inside epicoele 11 by both above-mentioned channel 10 communicated.However due to slide valve 6 and pressure valve 10 cross section of channel communicated between body 5 is smaller, therefore the flow resistance of hydraulic oil is larger, and correspondence causes the buffering of plunger 2 to hinder Power is larger, makes to increase the consumption of impact forces in 2 end stroke of plunger.

When progressing into 1 inside of cylinder body with plunger 2 and reach end of travel, the hydraulic oil pressure force value in inner cavity 12 is gradually Increasing to maximum, hydraulic oil, which possesses enough active forces, to be pushed the circular cone of pressure valve body 5 to face upward inside chamber 11 to move, so that The circular conical surface of pressure valve body 5 can not realize sealing, gap of the hydraulic oil between circular conical surface and recirculation hole 151 to recirculation hole 151 And it enters to inside epicoele 11.Since orifice size is larger between 151 edge of 5 circular conical surface of pressure valve body and recirculation hole at this time, for The buffering effect of hydraulic oil belongs to medium, therefore the greater impact that generates when being connected between tractor and trailer can be effectively relieved and make Firmly, and at this time valve block 8 can completely close unidirectional valve opening 141.It, can be to rubber spring after hydraulic oil enters epicoele 11 4 generate radial compression force, and rubber spring 4 is made to generate compressive deformation and energy storage.

When the left end inside plunger 2 is located at cylinder body 1, during the first spring 3 restores, the first spring 3 Lower spring cup 18 is pushed to move down, and then lower spring cup 18 pushes plunger 2 to move down, when plunger 2 is gradually displaced outwardly, 2 outer peripheral surface of plunger still to recirculation hole 151 generate closing, therefore the hydraulic oil only inside epicoele 11 from upper recirculation hole 142 into Enter to inner cavity 12, and hydraulic oil also will push valve block 8 to the movement of 12 direction of inner cavity, so that hydraulic oil can be by unidirectional Valve opening 141 enters in inner cavity 12.When being constantly back to inner cavity 12 from epicoele 11 with hydraulic oil, rubber spring 4 is not having Restored by radial pressure to original form, contention effect power can be generated to hydraulic oil in this way, hydraulic oil is more filled Divide and promptly entered in inner cavity 12 by unidirectional valve opening 141, rapid repairing is played, so that it is larger to avoid inner cavity 12 from generating Negative pressure.After plunger 2 is constantly displaced outwardly, the curved indentations notch 21 and recirculation hole 151 on 2 surface of plunger are gradually opposite, make The channel being connected between inner cavity 12 and exocoel 13 becomes larger, 131 volume of clay being set in exocoel 13 gradually expand and The hydraulic oil of exocoel 13 can enter in inner cavity 12 by recirculation hole 151, promote the hydraulic oil in exocoel 13 to be back to interior Chamber 12 is to balance the pressure difference between two cavitys.

The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model, It is all under the design of the utility model, equivalent structure transformation made based on the specification and figures of the utility model, or Directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.

Claims

1. a kind of plunger type buffer unit, which is characterized in that including the internal cylinder body for being equipped with receiving cavity, the cylinder interior is logical It crosses horizontal baffle and circumferential bulkhead is divided into and is set to the epicoele on top, the inner cavity for being set to lower part and exocoel, the exocoel is set It is placed in the lumen outer and the recirculation hole by being set to the circumferential bulkhead leads to, upstream is equipped in the middle part of the horizontal baffle Through-hole leads to the epicoele and the inner cavity；The inner cavity is axially arranged with plunger, and the cylinder body outer peripheral surface is equipped with ring-type Upper spring seat, the plunger end is cased with lower spring cup, and the first bullet is equipped between the upper spring seat and the lower spring cup Spring is placed on the cylinder body outer peripheral surface, and the plunger outer peripheral surface is equipped with curved indentations notch and can open or close the recirculation hole, It is equipped with flow media inside the inner cavity, the exocoel and the epicoele to flow between three cavitys, the outer chamber is also Equipped with snubber elastomeric medium；The epicoele internal circumferential is equipped with the rubber spring for radial energy storage, and the epicoele middle part is axial Pressure valve body equipped with the salable upper recirculation hole in end, the pressure valve body middle part is nested to be equipped with the slide valve being axially movable, institute It states slide valve bottom and is butted on top surface in the cylinder interior, the slide valve outer peripheral surface and installation block set inner circumferential equipped with second spring Face matches, and the pressure valve body, which is equipped with cavity, can entangle the installation block set, and the external circumferential surface of pressure valve is cased with third spring and is butted on The channel phase that top surface on the cylinder body, the slide valve bottom and the channel for being radially provided with connection are arranged radially with the pressure valve body Logical, the horizontal baffle is equipped with several unidirectional valve openings and communicates the epicoele and the inner cavity, and the unidirectional valve opening can be by axis It is opened or closed to mobile valve block, the valve block is connected by valve block end cap with the upper recirculation hole.

2. plunger type buffer unit as described in claim 1, which is characterized in that be equipped with several circle phases inside the rubber spring The compressible closed cavity mutually separated, the part-structure outer profile of the rubber spring longitudinal section are hexagon.

3. plunger type buffer unit as claimed in claim 2, which is characterized in that the inside initial end angle axis of the rubber spring It can be with the cylinder body inner top surface and horizontal baffle top surface negative-pressure adsorption to groove is equipped with.

4. plunger type buffer unit as described in claim 1, which is characterized in that the pressure body base is conical surface, institute Pressure valve body bottom part is stated to be inserted into the upper recirculation hole to the upper recirculation hole circumferential direction sealing.

5. plunger type buffer unit as claimed in claim 4, which is characterized in that the stiffness factor of the third spring is greater than institute State the stiffness factor of second spring.

6. plunger type buffer unit as described in claim 1, which is characterized in that the installation block set root is equipped with annular resilient Pad can offset with the slide valve top, and the centre bore bottom edge of the pressure valve body is equipped with snap ring and carries out axis to the slide valve To limit.

7. plunger type buffer unit as described in claim 1, which is characterized in that be cased with end cap, the end in the middle part of the plunger Lid outer peripheral surface is connected with the cylinder ends with convex block and groove cooperation, between the end cap inner peripheral surface and the plunger outer peripheral surface Equipped with the first sealing ring, the second sealing ring is equipped between the end cap and cylinder body mutual cooperation position.

8. plunger type buffer unit as described in claim 1, which is characterized in that the thickness of the valve block is from center to side side Along gradually becoming smaller, the surface of the valve block towards the inner cavity is the curved surface from middle part to sides tapered.

9. plunger type buffer unit as described in claim 1, which is characterized in that the plunger end outer peripheral surface and the lower bullet Graphite copper sheathing is equipped between spring abutment mutual cooperation position.