CN2637792Y - Synchronous multi stage plunger oil cylinder containing speed limit cut-off valve - Google Patents
Synchronous multi stage plunger oil cylinder containing speed limit cut-off valve Download PDFInfo
- Publication number
- CN2637792Y CN2637792Y CN 03255389 CN03255389U CN2637792Y CN 2637792 Y CN2637792 Y CN 2637792Y CN 03255389 CN03255389 CN 03255389 CN 03255389 U CN03255389 U CN 03255389U CN 2637792 Y CN2637792 Y CN 2637792Y
- Authority
- CN
- China
- Prior art keywords
- plunger
- oil
- valve
- cylinder
- big
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Actuator (AREA)
Abstract
The synchronous multi stage plunger oil cylinder containing a speed limit cut-off valve of the utility model comprises a cylinder body, a big plunger piston and a small plunger piston. The base of the big plunger piston is provided with a one-way valve, and the through hole at the side wall end of the one-way valve is connected with an oil recess A and an oil recess B. The base of the cylinder body is provided with a speed limit cut-off valve, and the synchronous multi stage plunger oil cylinder is positioned on the machine frame by the connecting mode of ball pivot. The base of the big plunger piston is provided with a one-way valve and a side end through hole, which makes the big and small plunger pistons interlocked mutually. The big and small plunger pistons are simultaneously extended to keep the lifting speed of the flat truck constant. The base of the cylinder body is provided with the speed limit cut-off valve, which guarantees the reset speed of the plunger piston in the safe range. The speed limit cut-off valve can lock the gliding of the flat truck to prevent damage and satisfy the requirements of safety especially when the input oil conduit of the oil cylinder bursts. The synchronous multi stage plunger oil cylinder is connected with the machine frame by the mode of ball pivot, which can improve the stress status of the oil cylinder and prolong the service life. The utility model can also be applied to hydraulic ladders and hydraulic elevators.
Description
(1) technical field:
The present invention relates to a kind of synchronous multistage plunger cylinder that contains the speed limit stop valve, belong to the engineering element or the parts class of common engineering class.
(2) background technique:
In the prior art, the lifting of mechanical parking equipment sweep is adopted the multistage plunger cylinder mostly with plunger cylinder, is made up of cylinder body, big plunger, small plunger, is installed on the frame with the form of pivot pin; Hydraulic oil enters from the base of cylinder body, the plunger outward motion, and sweep gets a promotion, and when resetting, makes the plunger reversing motion by external force.The shortcoming of this structure is: when sweep promoted, hydraulic oil entered plunger cylinder from the base of cylinder body, and big plunger, small plunger stretch out successively, and the lifting speed of wooden handcart is not constant; When sweep descended, the rate of descent of sweep was also different when the load of bearing when sweep was different or unloaded, and unmanageable situation happens occasionally, and particularly during the input oil pipe explosion of oil cylinder, sweep will glide rapidly and work the mischief; In addition, plunger cylinder adopts the form of pivot pin to be installed on the frame, and additional bending moment bears in regular meeting, and the cylinder force situation worsens, easy oil leakage, and the life-span falls sharply.
(3) summary of the invention:
Purpose of the present invention is to guarantee that large and small plunger is overhanging synchronously when a kind of oil cylinder oil-feed is provided at the prior art deficiency; When oil cylinder resets, the adjustment that can be correct and the flow in stable hydraulic loop, with the plunger return speed limit in safety range, particularly when the input oil pipe explosion of oil cylinder, can lock the sweep downslide rapidly prevents to work the mischief, and can improve the force-bearing situation of oil cylinder, prolong the synchronous multistage plunger cylinder that contains the speed limit stop valve in its life-span.
Purpose of the present invention, realize by following measure: the synchronous multistage plunger cylinder that contains the speed limit stop valve is made up of cylinder body, big plunger, small plunger, it is characterized in that: on the big plunger base one-way valve is installed, its sidewall end has through hole, and through hole is communicated with the oil pocket A of cylinder wall and the formation of huge pillar plug and the oil pocket B of big plunger and small plunger formation; The speed limit stop valve of being made up of plug screw, valve body, spool, spring has been installed in the cylinder body base of plunger cylinder, have oil outlet on the valve body, have throttle orifice on the spool, spool is by spring compression leftmost side in valve body, by the pressure of spool both sides liquid and the elastic force of spring, the relative position of oil outlet on throttle orifice and the valve body on the change spool; It is protruding spherical or recessed spherical that the head of small plunger is, and forms a pair of ball pivot with frame and be connected, and it is recessed spherical or protruding spherical that the base of cylinder body is, and forms another ball pivot with frame and be connected.
Plunger in also having between big plunger, small plunger is equipped with one-way valve on the middle plunger base, and its sidewall end has through hole, and through hole is communicated with the oil pocket A1 of big plunger and the formation of center pillar plug and the oil pocket B1 of middle plunger and small plunger formation.
Compared with prior art, on the base of big plunger, one-way valve is installed, side has through hole to be communicated with the oil pocket A of cylinder wall and the formation of huge pillar plug and the oil pocket B of big plunger and small plunger formation, greatly, the mutual interlock of small plunger, stretch out synchronously and keep the lifting speed of wooden handcart constant, in oil-feed place of cylinder body base the speed limit stop valve has been installed, utilize the pressure of spool both sides liquid and the elastic force of spring, the relative position of oil outlet on throttle orifice and the valve body on the change spool, adjust and limit the flow of oil hydraulic circuit, guarantee that plunger return speed is in safety range, particularly when the input oil pipe explosion of oil cylinder, can lock the sweep downslide rapidly and prevent to work the mischief, satisfy the requirement on the safety in utilization; The plunger cylinder two ends are connected with frame in the mode of ball pivot, make oil cylinder become the two-force member of pure pressurized, improve the force-bearing situation of oil cylinder, prolong its life-span.This model utility also can be applicable in hydraulic pressure ladder and the lift.
(4) description of drawings:
Fig. 1 is the preferred embodiment schematic representation that the utility model proposes.
Fig. 2 is the schematic representation of balance stop valve when being in the equilibrium position.
Fig. 3 is three grades of synchronous plunger cylinder embodiment schematic representation that the utility model proposes.
(5) embodiment:
Below in conjunction with accompanying drawing embodiment is elaborated:
In the preferred embodiments of the present invention shown in Figure 1, synchronous multistage plunger cylinder is made up of cylinder body (1), big plunger (2), small plunger (3), on big plunger (2) base one-way valve (4) is installed, its sidewall end has through hole (5), one-way valve (4) has cut off the direct connection between cylinder body (1) and the small plunger (3), form oil-feed oil pocket C, through hole (5) is communicated with the oil pocket A of cylinder body (1) wall and plunger (2) formation greatly and the oil pocket B of big plunger (2) and small plunger (3) formation; In cylinder body (1) base of plunger cylinder, the speed limit stop valve of being made up of plug screw (6), valve body (7), spool (8), spring (9) (10) has been installed, have oil outlet (11) on the valve body (7), have throttle orifice (12) on the spool (8), spool (8) is pressed on the interior leftmost side of valve body (7) by spring (9).It is oil-filled in A, B chamber when the effect of one-way valve (4) is the assembling oil cylinder.Synchronously during the plunger cylinder proper functioning, when the lifting of need sweep makes the oil cylinder oil-feed, stream oil enters speed limit stop valve (10) through transport pipe, be positioned at the high order end of valve body (8) because of spool (8), throttle orifice (12) standard-sized sheet of spool (9), the oil outlet (11) of stream oil on throttle orifice (12) and valve body (7) enters in the oil-feed oil pocket C, it is overhanging that then oil pressure promotes big plunger (2), meanwhile, overhanging because of big plunger (2), cause the fluid in the oil pocket A to flow to oil pocket B, drive small plunger (3) and be synchronized with the movement, thereby the lifting speed that guarantees sweep keeps constant.When sweep zero load or load resetted, the decline of small plunger (3) made oil pocket B backflow oil pocket A, drove big plunger (2) and descended synchronously, and the oil of oil-feed oil pocket C begins to reflux, and establishing and acting on spool (8) left side is that the pressure of oil pocket C liquid oil is P in the oil cylinder
1, act on spool (8) right side by the pressure behind the throttle orifice, also be that the pressure in the plunger cylinder transport pipe is P
2, the sectional area of spool (8) is a, when then spool was in the weighing apparatus position, the stress balance at its two ends had: P
1* a=P
2* a+R, when an end pressure as P
1During increase, spool moves right, and last throttle orifice (12) of regulating spool (8) and valve body (7) are gone up the relative position of oil outlet (11), and the oily passage of stream is diminished, and limits the flow that it passes through, thus the movement velocity of control oil cylinder.Particularly when the explosion of plunger cylinder transport pipe, P
2Sharply dropped to 0 o'clock, because P
1Effect, spool moves right rapidly, closes throttle orifice (12), pins the in-oil cylinder oil of multistage plunger, sweep is locked on the original position like this.In addition because the head (13) of the small plunger (3) of synchronous multistage plunger cylinder is protruding spherical, mode with ball pivot is installed on the frame, and the base (14) of cylinder body (1) is recessed spherical, also the mode with ball pivot is installed on the frame, plunger cylinder becomes the pure two-force member that is stressed synchronously, no additional bending moment has improved stressing conditions.
Fig. 3 has provided three grades of synchronous multistage plunger cylinder embodiment schematic representation, middle plunger (14) is positioned between big plunger (2), the small plunger (3), on middle plunger (15) base one-way valve (16) is installed, its sidewall end has through hole (17), and through hole (17) is communicated with the oil pocket A1 of big plunger and the formation of center pillar plug and the oil pocket B1 of middle plunger and small plunger formation.One-way valve (4), (16) make sweep be full of fluid in oil pocket A, A1, B, the B1 before lifting.When sweep promotes, be full of stream oil in the oil cylinder oil pocket C, it is overhanging to promote big plunger (2), the stream oil of oil pocket A flows into oil pocket B1 by through hole (5), plunger in the promotion (15) is overhanging, and the stream oil of oil pocket A1 flows into oil pocket B by through hole (17), and it is overhanging to promote small plunger (3), plunger, middle plunger, small plunger promote synchronously like this, greatly.Vice versa.
Claims (2)
1. synchronous multistage plunger cylinder that contains the speed limit stop valve, it is made up of cylinder body (1), big plunger (2), small plunger (3), it is characterized in that: on big plunger (2) base one-way valve (4) is installed, its sidewall end has through hole (5), and through hole (5) is communicated with the oil pocket A of cylinder body (1) wall and plunger (2) formation greatly and the oil pocket B of big plunger (2) and small plunger (3) formation; In cylinder body (1) base of plunger cylinder, the speed limit stop valve of being made up of plug screw (6), valve body (7), spool (8), spring (9) (10) has been installed, have oil outlet (11) on the valve body (7), have throttle orifice (12) on the spool (8), spool (8) is pressed on the leftmost side in the valve body by spring (9), by the pressure of spool (8) both sides liquid and the elastic force of spring (9), change the relative position that last throttle orifice (12) of spool (8) and valve body (7) are gone up oil outlet (11); It is protruding spherical or recessed spherical that the head (13) of small plunger (3) is, and forms a pair of ball pivot with frame and be connected, and it is recessed spherical or protruding spherical that the base of cylinder body (14) is, and forms another ball pivot with frame and be connected.
2. the synchronous multistage plunger cylinder that contains the speed limit stop valve according to claim 1, it is characterized in that described between big plunger (2), small plunger (3), also have in plunger (15), on middle plunger (15) base one-way valve (16) is installed, its sidewall end has through hole (17), and through hole (16) is communicated with big plunger (2) and the oil pocket A1 of middle plunger (15) formation and the oil pocket B1 of middle plunger (15) and small plunger (3) formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03255389 CN2637792Y (en) | 2003-07-08 | 2003-07-08 | Synchronous multi stage plunger oil cylinder containing speed limit cut-off valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03255389 CN2637792Y (en) | 2003-07-08 | 2003-07-08 | Synchronous multi stage plunger oil cylinder containing speed limit cut-off valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2637792Y true CN2637792Y (en) | 2004-09-01 |
Family
ID=34294921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03255389 Expired - Lifetime CN2637792Y (en) | 2003-07-08 | 2003-07-08 | Synchronous multi stage plunger oil cylinder containing speed limit cut-off valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2637792Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278219B (en) * | 2013-04-28 | 2015-07-01 | 南京航空航天大学 | Double-range low-friction metering cylinder used for calibrating flow meter |
| CN109140000A (en) * | 2018-09-30 | 2019-01-04 | 嘉善海力达工具有限公司 | A kind of twin-stage speed limiting mechanism |
-
2003
- 2003-07-08 CN CN 03255389 patent/CN2637792Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278219B (en) * | 2013-04-28 | 2015-07-01 | 南京航空航天大学 | Double-range low-friction metering cylinder used for calibrating flow meter |
| CN109140000A (en) * | 2018-09-30 | 2019-01-04 | 嘉善海力达工具有限公司 | A kind of twin-stage speed limiting mechanism |
| CN109140000B (en) * | 2018-09-30 | 2023-09-01 | 嘉善海力达工具有限公司 | Two-stage speed limiting mechanism |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105626258B (en) | Hydraulic drive type variable-compression-ratio piston link assembly | |
| CN105952705B (en) | Balanced valve | |
| CN106195370A (en) | Cartridge balanced valve | |
| CN201653131U (en) | Hydraulic lifting system for walking beam of large-sized walking beam furnace | |
| CN101392809A (en) | Active hydraulic damper and hydraulic actuator | |
| CN204704176U (en) | A kind of piston elevator mechanism and hydraulic control device thereof | |
| CN104477798A (en) | Main arm variable amplitude control system of crane and crane | |
| CN104879334B (en) | Piston elevating mechanism and its hydraulic control device | |
| CN106321534B (en) | Marine floating type well drilling traveling block hook heave compensator | |
| CN2885800Y (en) | Hydraulic elevator | |
| CN110447393A (en) | Agricultural harvesting machinery ceding of Taiwan shape imitation hydraulic control system with pressure compensation | |
| CN2637792Y (en) | Synchronous multi stage plunger oil cylinder containing speed limit cut-off valve | |
| CN204096970U (en) | A kind of luffing range of cantilever support hydraulic efficiency pressure system of hoisting crane and hoisting crane | |
| US6129525A (en) | Speed control for fluid powered diaphragm pumps | |
| CN110985459A (en) | Hydraulic control system of load-sensitive pump | |
| EP1241356A3 (en) | Drive circuit for fluid motor | |
| CN111396390B (en) | Balance valve group suitable for stability control of overhead working truck | |
| CN210290316U (en) | One-way constant speed valve and speed-stabilizing hydraulic oil cylinder with same | |
| CN201106595Y (en) | Adjustable dual-speed slow-opening slow-closing oil cylinder | |
| CN108087347A (en) | A kind of single-acting automatic reciprocating type booster | |
| CN106122144B (en) | The pilot-actuated valve to operate steadily | |
| CN201874908U (en) | Special valve for air-conditioner of engineering machinery | |
| CN209325112U (en) | A kind of unidirectional speed regulation screw-in cartridge valve | |
| CN2622451Y (en) | Single handle operated lifting/lowering, steering hydraulic integrated valve | |
| CN201547311U (en) | Flushing valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Designer after: Li Zirong Designer before: Li Xiaorong |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: DESIGNER; FROM: LI XIAORONG TO: LI ZIRONG |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130708 Granted publication date: 20040901 |