CN2107454U - Rapid hydraulic jack - Google Patents
Rapid hydraulic jack Download PDFInfo
- Publication number
- CN2107454U CN2107454U CN 91230365 CN91230365U CN2107454U CN 2107454 U CN2107454 U CN 2107454U CN 91230365 CN91230365 CN 91230365 CN 91230365 U CN91230365 U CN 91230365U CN 2107454 U CN2107454 U CN 2107454U
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- hydraulic jack
- load
- operating cylinder
- plunger
- utility
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Abstract
The utility model relates to a rapid hydraulic jack, which can rapidly lift when no-load and light load, and can automatically slow down the lifting speed when heavy load. A plunger pump with larger diameter and an unloading valve are added on the basis of the existing hydraulic jack, the two pumps can supply oil to the operating cylinder all together when no load and light load, when heavy load, only the small pump supplies oil to the operating cylinder with the function of the unloading valve, and thereby, the functions are achieved. The utility model has the advantages of compact structure, reliable work, and high working speed.
Description
The utility model relates to a kind of hydraulic jack, particularly a kind ofly can rise the top fast when unloaded, underloading, and can slow down automatically when heavy duty rises the hydraulic jack of top speed.
Existingly can change the hydraulic jack that rises top speed automatically, through looking into utility model ［ notification number CN2061169U ］---the hydraulic pressure automatic speed regulation jack that sees Patent Office of People's Republic of China (PRC) bulletin in 29 days Augusts nineteen ninety.This utility model is addressed " this jack has been accelerated the ascending velocity when unloaded, improves the work work efficiency, and is easy to use " in summary.But the unloaded piston that its structure adopts is to lean on the pressure of spring through fluid working piston to be risen, and causes the relative motion part more, and it is not too reliable to work, and particularly the epicoele of low pressure oil cylinder does not have inlet and outlet hole and draining hole, is difficult to make this utility model to be implemented.
Usually used hydraulic jack and since compact conformation, in light weight, lifting power be widely used in greatly hoisting capacity greatly, the instrument of the indispensability of lifting highly little occasion, especially automobile.
As everyone knows, hydraulic jack is according to the ideal liquid in the leakproof tank, and the principle of each point pressure equalization is that Bath adds the principle design manufacturing behind the pressurized.Consider the power of pressing of staff, the suitable length of handle and the factors such as size of oil pressure during design, the hydraulic jack of applied large and small tonnage in the practice, produce the plunger pump of pressure oil, its diameter of plunger all is 12 millimeters usually, and the power of pressing that staff imposes on handle generally all is no more than 20 kilograms.The increase of hydraulic jack rated tonnage is to obtain by the diameter that increases operating cylinder.Therefore, the big more hoisting speed of hydraulic jack tonnage is slow more.Facts have proved that hydraulic jack withstands on that the chance of the following work of rated tonnage is more, this just causes the power of pressing of staff to can not get fully playing, hydraulic jack simultaneously, though load-carrying ability is big, hoisting speed is too slow and no-load speed is slow too.
The utility model provides a kind of zero load, underloading can rise the top fast at the deficiency that has hydraulic jack now, and heavy duty can be slowed down automatically and be risen the hydraulic jack of top speed, to reach the raising work efficiency.
The technical solution of the utility model is achieved in that increases a larger-diameter plunger pump again on the basis of a plunger pump of former hydraulic pressure jack.By means of unloader valve, when guaranteeing zero load, underloading this two pump simultaneously to the clutch release slave cylinder fuel feeding, thereby accelerated to rise top speed.Automatically open by the unloader valve of operating cylinder internal pressure oil control during heavy duty, the fluid that the major diameter plunger pump is extruded no longer enters clutch release slave cylinder and flows back to oil sump, have only the small plunger diameter pump to the operating cylinder fuel feeding this moment, rises top speed thereby slowed down, and alleviated the power of pressing of staff.
Following the utility model provides embodiment in conjunction with the accompanying drawings.
The structural representation of accompanying drawing 1 the utility model embodiment.Accompanying drawing 2 is the A-A section of accompanying drawing 1.
With reference to accompanying drawing, the combined plunger pump 3 that the coaxial inner conductor of this underloading fast hydraulic pressure jack by former operating cylinder 1, former steering unit 2, after improving arranged and improve after 4 four parts of base form.The top lengthening of the smooth plunger of former plunger pump is strengthened, then form a stepped plunger, this ladder plunger and the pump housing constitute the compound type plunger pump that two coaxial inner conductors are arranged.These two plunger pumps separate with sealing member 8.The pressure oil duct 7 and the unloader valve 9 of drawing by operating cylinder of oil input channel 5, oil road 6 and the control unloader valve used for the major diameter plunger pump in former base, have been increased again.
During work, at first be two plunger pumps simultaneously to the operating cylinder fuel feeding, make working piston rise the top fast.If the object of jack-up is heavier, when the oil pressure in the operating cylinder reaches a certain value, also be the power of pressing of staff will surpass design value the time, the pressure at unloader valve pilot hole a place moves spool above the pressure of spring b oil duct 5,6 structures are led to.This moment, the major diameter plunger pump pushed back oil sump by the oil footpath oil duct 6 and 5 that oil duct 5 sucks.At this moment, since operating cylinder only by the small plunger diameter oil pump feed, so working piston rises the top at a slow speed.
Hydraulic jack of the present utility model can rise the top fast when zero load, underloading, automatic deceleration liter top during heavy duty, thus improved work efficiency, and simple in structure, reliable operation has practical value.
Claims (1)
- A kind of underloading fast hydraulic pressure jack, mainly form by operating cylinder 1, steering unit 2, plunger pump 3 and base 4, it is characterized in that: adopt the ladder plunger to constitute two plunger pumps of size, and big or small pump is separated and also adopted unloader valve to make leading to of big pump into and out of oil duct 5 and 6 structures by the control of the pressure oil in the operating cylinder with sealing member 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91230365 CN2107454U (en) | 1991-10-19 | 1991-10-19 | Rapid hydraulic jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91230365 CN2107454U (en) | 1991-10-19 | 1991-10-19 | Rapid hydraulic jack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2107454U true CN2107454U (en) | 1992-06-17 |
Family
ID=4935706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91230365 Granted CN2107454U (en) | 1991-10-19 | 1991-10-19 | Rapid hydraulic jack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2107454U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996022937A1 (en) * | 1995-01-28 | 1996-08-01 | Shinn Hua (China) Machinery Co., Ltd. | Control unit for hand-operated hydraulic jack |
-
1991
- 1991-10-19 CN CN 91230365 patent/CN2107454U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996022937A1 (en) * | 1995-01-28 | 1996-08-01 | Shinn Hua (China) Machinery Co., Ltd. | Control unit for hand-operated hydraulic jack |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |