CN104261300A - Hydraulic jack - Google Patents
Hydraulic jack Download PDFInfo
- Publication number
- CN104261300A CN104261300A CN201410395166.8A CN201410395166A CN104261300A CN 104261300 A CN104261300 A CN 104261300A CN 201410395166 A CN201410395166 A CN 201410395166A CN 104261300 A CN104261300 A CN 104261300A
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- China
- Prior art keywords
- oil
- hydraulic jack
- pipeline
- valve
- inlet line
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- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/42—Constructional features with self-contained pumps, e.g. actuated by hand
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A hydraulic jack in the prior art is low in control precision of an ejection height, and is not suitable for such occasions as aircrafts and ships having high requirement on control precision of the ejection height. The invention provides a hydraulic jack provided with a servo valve, which can realize precise control of the ejection height of the hydraulic jack. The hydraulic jack comprises an ejection device and an oil tank, wherein the ejection device consists of a cylinder provided with an inner cavity, a piston capable of vertically moving along a rodless cavity of the cylinder, and a piston rod connected to the piston; the bottom of the rodless cavity of the cylinder is communicated with an oil pipe; the oil pipe is communicated with the oil tank through an oil sucking pipeline 1 and an oil return pipeline; an oil pump, the servo valve and a stop valve are arranged on the oil sucking pipeline 1 from the oil tank to the oil pipe in sequence; and a one-way valve 1 is additionally arranged on the oil sucking pipeline 1 between the servo valve and the oil tank.
Description
Technical field
The present invention relates to technical field of jacks, be related specifically to a kind of hydraulic jack.
Background technology
Jack is that one rigid top lifts part as equipment, the light little weight-lifting equipment of jacking weight in stroke by top bracket or bottom claw.Jack is mainly used in the department such as factories and miness, communications and transportation as Mechanical Help and other work such as lifting, support.Jack can be divided into mechanical jack and hydraulic jack two kinds according to principle.Mechanical jack, also known as lifting screw, is by manpower by screw pair transmission, and screw rod or ut socket lift part as top.Lifting screw supports weight by screw thread self-locking effect, simple structure, but driving efficiency is low, and return is slow.Hydraulic jack, also known as oil jack, is that a kind of plunger or hydraulic actuating cylinder of adopting lifts the jack of part as rigid top.Hydraulic jack is generally made up of main portions such as grease chamber, oil pump, shoe cream room, piston, crank, fuel taps, during work, as long as back and forth pull crank, make hand oil pump constantly to force feed in oil cylinder, due to constantly increasing of oil pressure in oil cylinder, just force the weight upward movement together above piston and piston rod.Open fuel-return valve, in-oil cylinder high pressure oil just flows back to shoe cream room, then weight and piston also just together with fall.
Along with the progress of technology, prior art has occurred that some driven by motor oil pumps replace the hydraulic jack of hand oil pump driving, reduce further labour intensity when using jack, and by the velocity of rotation of calculating motor and the jack-up height of time controling jack, the semi-automation tentatively achieving jack controls.
But even so, the hydraulic jack Applicable scope of prior art is still limited, the less demanding occasion of control accuracy that some such as automobiles change the jack-up height such as tire only can be applied in.The technical field such as aircraft, boats and ships usually need multiple hydraulic jack with the use of, and the jack-up requirement for height of multiple hydraulic jack is consistent, and jack-up height control accuracy requires high, and the hydraulic jack of prior art generally can not meet this demand.
Summary of the invention
In order to the control accuracy overcoming the jack-up height that prior art hydraulic jack exists is low, the jack-up height control accuracy such as inapplicable aircraft, boats and ships require high occasion.The invention provides a kind of hydraulic jack with servovalve, the precise hard_drawn tuhes of hydraulic jack jack-up height can be realized.
Servovalve mainly refers to electrohydraulic servo valve, and it is after accepting electric simulation signal, correspondingly can export flow and the pressure of modulation, to realize the precise hard_drawn tuhes of delivery rate.It is electro-hydraulic converting element, also can be power amplification element, and low power faint electrical input signal can be converted to high-performance hydraulic energy (flow and pressure) and export by it.In electrohydraulic servo system, electric part and hydraulic part couple together by it, and the conversion and the hydraulic pressure that realize electric liquid signal amplify.
Change-over valve is by means of the relative motion between guiding valve and valve body, makes each oil circuit be connected with valve body realize the connection of hydraulic oil stream, cut-out and commutation.When the guiding valve that the Median Function of change-over valve refers in change-over valve is in midway location or initial position, the connection form of each hydraulic fluid port in valve, embodies the Control function of change-over valve.Adopt multi-form guiding valve directly can affect the working condition of power element.
H type Median Function change-over valve is when meta, and each hydraulic fluid port standard-sized sheet, system does not have oil pressure.Functional Characteristics: 1, oil inlet P, oil return inlet T are all communicated with actuator port B, A, makes working machine form quick condition, can move under external force, can be used for hand mechanism.2, Hydraulic Pump can off-load.3, impact is had from stopping to startup.Because the fluid of oil back chamber flows back to fuel tank when operating mechanism stops, fluid is not had to play buffer action.Hydraulic fluid port intercommunication during braking, therefore brake comparatively that O type is steady.4, for single pole two-way cylinder, due to piston both sides effective active area not etc., thus can not ensure that piston is in halted state completely with the guiding valve of this function.
M type Median Function change-over valve is when meta, and actuator port B, A close, and oil inlet P, oil return inlet T are directly connected.Functional Characteristics: 1, because actuator port B, A close, operating mechanism can keep static.2, Hydraulic Pump can off-load.3, the mechanism with manual setter can not be used for.4, more steady from stopping to starting.5, during braking, motional inertia causes hydraulic efficiency impact larger.6, can be used for oil pump off-load and in the hydraulic circuit of hydraulic locking cylinder.
A kind of hydraulic jack of the present invention comprises jacking system and fuel tank, jacking system by be provided with internal cavity cylinder body, can form along the piston of cylinder body rodless cavity up-and-down movement and the piston rod be connected on piston, be communicated with oil pipe bottom cylinder body rodless cavity, oil pipe is communicated with fuel tank with oil return line respectively by inlet line one;
Inlet line one from fuel tank to oil pipe is disposed with oil pump, servovalve and shutoff valve, and the inlet line one between servovalve and fuel tank is also provided with check valve one, and this hydraulic jack also comprises the motor that oil pump can be driven to operate.
Further, the cylinder side wall at the range place of piston offers oil cylinder B mouth, oil cylinder B mouth is communicated with oil return line, servovalve respectively by oil return line one, oil return line two;
Inlet line one between servovalve and oil pump is also provided with H type Median Function change-over valve, the oil outlet T of H type Median Function change-over valve is communicated with oil return line by pipeline one, the oil outlet T of H type Median Function change-over valve is communicated with the return opening of servovalve by pipeline two, pipeline two is provided with check valve three;
This hydraulic jack also comprises M type Median Function change-over valve, oil outlet T, the oil inlet P of M type Median Function change-over valve are communicated with oil outlet T, the actuator port A of H type Median Function change-over valve respectively, and actuator port B, A of M type Median Function change-over valve are communicated with oil return line two, shutoff valve respectively by pipeline four, pipeline five.
Further, between oil pipe and fuel tank, be also provided with inlet line two, inlet line two be provided with manual pump and check valve two.
Further, check valve one is arranged on the inlet line one between oil pump and H type Median Function change-over valve, and the inlet line one between check valve one and H type Median Function change-over valve is also connected with pressure sensor; Inlet line one between check valve one and H type Median Function change-over valve is communicated with oil return line by pipeline six, and pipeline six is provided with by pass valve.
Further, the bottom of oil return line, inlet line one and inlet line two is respectively arranged with return filter, oil absorption filter one, oil absorption filter two near the part of fuel tank.
Further, inlet line one is all communicated with fuel tank by pipeline seven with inlet line two, pipeline seven is provided with oil absorption filter and replaces oil absorption filter one and oil absorption filter two, return filter is arranged at fuel tank outside, and oil absorption filter is arranged on fuel tank internal.Preferred further, be also provided with air filter device in fuel tank.
Further, oil pipe is connected with compression indicator.
Further, on the inlet line two of check valve two between manual pump and oil pipe, the inlet line two between check valve two and pipeline is also provided with hydraulic control one-way valve.
Further, the piston of jacking system is connected with displacement sensing apparatus.
Further, this hydraulic jack also comprises the PLC controlling servovalve and motor.
Compared with prior art, beneficial effect of the present invention is as follows:
First, hydraulic jack of the present invention can realize the precise hard_drawn tuhes of the flow of the oil to the conveying of cylinder body rodless cavity by servovalve, and then realizes the precise hard_drawn tuhes to jacking system piston rod jack-up height.
Secondly, the invention provides one and stablize perfect jack hydraulic system, pressure sensor and by pass valve cooperatively interact, when the pressure of overpressure sensor settings, by pass valve can be opened automatically, hydraulic oil directly can flow back to oil return line from pipeline six, with the pressure release of completion system, avoids hypertonia to cause the damage of Hydraulic Elements and pipeline.
3rd, the electric-controlled hydraulic jack existed for prior art cannot use when hydraulic efficiency pressure system breaks down, and even using breaks down suddenly during hydraulic jack causes the weight supported sharply to fall to causing the problems such as accident generation; The present invention devises an independently manual control hydraulic oil circuit outside hydraulic efficiency pressure system, and when electronically controlled hydraulic system breaks down, the hydraulic circuit enabling Non-follow control effectively can solve foregoing problems.
4th, hydraulic efficiency pressure system generally has higher requirements to the quality of hydraulic oil.But, even the hydraulic oil of higher quality, among oil pipe after continuous circular flow, with the impact of local higher temperature higher pressure and the wearing and tearing of whole kinematic pair, constantly can accumulate various iron filings and other impurity.The impurity of continuous accumulation can cause increasing impact to hydraulic efficiency pressure system, even affects the normal operation of hydraulic efficiency pressure system.In order to solve foregoing problems, the present invention has added oil absorption filter and return filter to carry out contaminant filter to the hydraulic oil entering and leave hydraulic efficiency pressure system, effectively reduces the impurity accumulated in hydraulic oil to the impact of hydraulic efficiency pressure system.Meanwhile, return filter is arranged on fuel tank outside, makes unpicking and washing of return filter more easy.Meanwhile, in fuel tank, the independent air filter device arranged also plays a good role to the removal of hydraulic pressure well cuts in fuel tank.
5th, in order to directly perceived further and intelligentizedly to control hydraulic efficiency pressure system, inventive piston or piston rod can connect displacement pickup is set to monitor the jack-up height of jacking system at any time.Further, can also be completed by additional PLC Based Intelligent Control is carried out to the operation of servovalve and motor.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of a hydraulic jack of the present invention embodiment;
In accompanying drawing 1: 1 is fuel tank, 2 is air filter device, 3 is oil absorption filter, 4 is return filter, 5 is oil return line, 6 is by pass valve, 7 is flow regulating valve, 8 is oil pipe, 9 is cylinder body rodless cavity, 10 is cylinder body, 11 is piston rod, 12 is compression indicator, 13 is hydraulic control one-way valve, 14 is inlet line two, 15 is M type Median Function change-over valve, 16 is H type Median Function change-over valve, 17 is check valve two, 18 is manual pump, 19 is oil pump, 20 is check valve one, 21 is pressure measuring tie-in, 22 is pressure sensor, 23 is inlet line one, 24 is servovalve, 25 is shutoff valve, 26 is pipeline one, 27 is pipeline two, 28 is pipeline three, 29 is pipeline four, 30 is pipeline five, 31 is oil return line two, 32 is oil return line one, 33 is motor.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is further elaborated.
As shown in Figure 1, the present embodiment hydraulic jack comprises:
Jacking system and fuel tank 1, jacking system by be provided with internal cavity cylinder body 10, can form along the piston of cylinder body rodless cavity 9 up-and-down movement and the piston rod 11 be connected on piston.
Be communicated with oil pipe 8 bottom cylinder body rodless cavity 9, fuel tank 1 is communicated with pipeline seven, pipeline seven is provided with oil absorption filter 3 and switching ball one.
Pipeline seven is communicated with oil pipe 8 respectively by inlet line 1, inlet line 2 14; Fuel tank 1 is also communicated with oil pipe 8 by oil return line 5.
Be disposed with oil pump 19, check valve 1, H type Median Function change-over valve 16, servovalve 24 and shutoff valve 25 from pipeline seven to the inlet line 1 of oil pipe 8, oil pump 19 is connected with the motor 33 having driven running; Hand oil pump, check valve 2 17, hydraulic control one-way valve 13 is disposed with from pipeline seven to the inlet line 2 14 of oil pipe 8; Return filter 4, flow regulating valve 7 and switching ball two is disposed with from fuel tank 1 to the oil return line 5 of oil pipe 8.
Cylinder body 10 sidewall at the range place of piston offers oil cylinder B mouth, oil cylinder B mouth is communicated with servovalve 24, oil return line 5 between flow regulating valve 7 and oil pipe 8 respectively by oil return line 2 31, oil return line 1, and this oil return line 1 is provided with switching ball three.
This hydraulic jack also comprises M type Median Function change-over valve 15, oil outlet T, the oil inlet P of M type Median Function change-over valve 15 are communicated with oil outlet T, the actuator port A of H type Median Function change-over valve 16 respectively, and actuator port B, A of M type Median Function change-over valve 15 are communicated with oil return line 2 31, shutoff valve 25 respectively by pipeline 4 29, pipeline 5 30.
The oil outlet T of H type Median Function change-over valve 16 is communicated with " oil return line 5 between flow regulating valve 7 and oil pipe 8 " by pipeline 1, the oil outlet T of H type Median Function change-over valve 16 is communicated with the return opening of servovalve 24 by pipeline 2 27, pipeline 2 27 is provided with check valve three.
Further, the piston of jacking system is connected with displacement sensing apparatus; Oil pipe 8 is connected with compression indicator 12; Air filter device is also provided with in fuel tank.
Preferably, this hydraulic jack also comprises the PLC controlling servovalve 24 and motor 33.
Done detailed elaboration by a preferred embodiment to the present invention above, it will be clear that cited embodiment is not to be understood that becomes limiting the scope of the invention.The content that protection scope of the present invention should limit with claims is as the criterion, and specification sheets and accompanying drawing thereof can be used for explaining claims.
Claims (10)
1. a hydraulic jack, it is characterized in that, comprise jacking system and fuel tank (1), described jacking system by be provided with internal cavity cylinder body (10), can form along the piston of cylinder body rodless cavity (9) up-and-down movement and the piston rod (11) be connected on piston, cylinder body rodless cavity (9) bottom is communicated with oil pipe (8), and described oil pipe (8) is communicated with fuel tank (1) with oil return line (5) respectively by inlet line one (23);
Oil pump (19), servovalve (24) and shutoff valve (25) is disposed with from fuel tank (1) to the inlet line one (23) of oil pipe (8), inlet line one (23) between servovalve (24) and fuel tank (1) is also provided with check valve one (20), and this hydraulic jack also comprises the motor (33) that oil pump (19) can be driven to operate.
2. a kind of hydraulic jack according to claim 1, is characterized in that,
Cylinder body (10) sidewall at the range place of described piston offers oil cylinder B mouth, and described oil cylinder B mouth is communicated with oil return line (5), servovalve (24) respectively by oil return line one (32), oil return line two (31);
Inlet line one (23) between described servovalve (24) and oil pump (19) is also provided with H type Median Function change-over valve (16), the oil outlet T of H type Median Function change-over valve (16) is communicated with oil return line (5) by pipeline one (26), the oil outlet T of H type Median Function change-over valve (16) is communicated with the return opening of servovalve (24) by pipeline two (27), and described pipeline two (27) is provided with check valve three;
This hydraulic jack also comprises M type Median Function change-over valve (15), oil outlet T, the oil inlet P of described M type Median Function change-over valve (15) are communicated with oil outlet T, the actuator port A of H type Median Function change-over valve (16) respectively, and actuator port B, A of M type Median Function change-over valve (15) are communicated with oil return line two (31), shutoff valve (25) respectively by pipeline four (29), pipeline five (30).
3. a kind of hydraulic jack according to claim 2, it is characterized in that, also be provided with inlet line two (14) between described oil pipe (8) and fuel tank (1), inlet line two (14) be provided with manual pump (18) and check valve two (17).
4. a kind of hydraulic jack according to Claims 2 or 3, it is characterized in that, described check valve one (20) is arranged on the inlet line one (23) between oil pump (19) and H type Median Function change-over valve (16), and the inlet line one (23) between check valve one (20) and H type Median Function change-over valve (16) is also connected with pressure sensor (22); Inlet line one (23) between check valve one (20) and H type Median Function change-over valve (16) is communicated with oil return line (5) by pipeline six, described pipeline six is provided with by pass valve (6).
5. a kind of hydraulic jack according to the arbitrary claim of Claims 1 to 4, it is characterized in that, the bottom of described oil return line (5), inlet line one (23) and inlet line two (14) is respectively arranged with return filter (4), oil absorption filter one, oil absorption filter two near the part of fuel tank.
6. a kind of hydraulic jack according to claim 5, it is characterized in that, inlet line one (23) and inlet line two (14) all pass through pipeline seven and are communicated with fuel tank (1), pipeline seven is provided with oil absorption filter (3) and replaces oil absorption filter one and oil absorption filter two, return filter (4) is arranged at fuel tank (1) outside, and it is inner that oil absorption filter (3) is arranged on fuel tank (1).
7. a kind of hydraulic jack according to claim 6, is characterized in that, described oil pipe (8) is connected with compression indicator (12).
8. a kind of hydraulic jack according to claim 7, it is characterized in that, described check valve two (17) is positioned on the inlet line two (14) between manual pump (18) and oil pipe (8), and the inlet line two (14) between check valve two (17) and pipeline (8) is also provided with hydraulic control one-way valve (13).
9. a kind of hydraulic jack according to claim 8, is characterized in that, the piston of described jacking system is connected with displacement sensing apparatus.
10. a kind of hydraulic jack according to claim 9, is characterized in that, this hydraulic jack also comprises the PLC controlling servovalve (24) and motor (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410395166.8A CN104261300B (en) | 2014-08-12 | A kind of hydraulic jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410395166.8A CN104261300B (en) | 2014-08-12 | A kind of hydraulic jack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104261300A true CN104261300A (en) | 2015-01-07 |
| CN104261300B CN104261300B (en) | 2017-01-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109305634A (en) * | 2017-07-28 | 2019-02-05 | 方根法 | Hydraulic rotating jack |
| CN114455499A (en) * | 2022-01-26 | 2022-05-10 | 浙江工业大学 | Electrohydraulic jack without external oil source |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050132876A1 (en) * | 2003-12-23 | 2005-06-23 | Giat Industries | Position control device for a hydraulic actuator and interface plate for a servovalve implementing such a device |
| CN102328888A (en) * | 2011-09-15 | 2012-01-25 | 莱芜钢铁集团有限公司 | Hydraulic servo synchronous lifting device and control method thereof |
| CN202853917U (en) * | 2012-10-19 | 2013-04-03 | 浙江大成电气有限公司 | High-precision hydraulic jack calibrating device |
| CN103244497A (en) * | 2013-05-13 | 2013-08-14 | 深圳市瑞格尔仪器有限公司 | Ultrahigh pressure hydraulic servo valve core, servo valve, one-way loading system and two-way loading system |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050132876A1 (en) * | 2003-12-23 | 2005-06-23 | Giat Industries | Position control device for a hydraulic actuator and interface plate for a servovalve implementing such a device |
| CN102328888A (en) * | 2011-09-15 | 2012-01-25 | 莱芜钢铁集团有限公司 | Hydraulic servo synchronous lifting device and control method thereof |
| CN202853917U (en) * | 2012-10-19 | 2013-04-03 | 浙江大成电气有限公司 | High-precision hydraulic jack calibrating device |
| CN103244497A (en) * | 2013-05-13 | 2013-08-14 | 深圳市瑞格尔仪器有限公司 | Ultrahigh pressure hydraulic servo valve core, servo valve, one-way loading system and two-way loading system |
Non-Patent Citations (1)
| Title |
|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109305634A (en) * | 2017-07-28 | 2019-02-05 | 方根法 | Hydraulic rotating jack |
| CN109305634B (en) * | 2017-07-28 | 2021-11-02 | 方根法 | Hydraulic rotary jack |
| CN114455499A (en) * | 2022-01-26 | 2022-05-10 | 浙江工业大学 | Electrohydraulic jack without external oil source |
| CN114455499B (en) * | 2022-01-26 | 2024-01-16 | 浙江工业大学 | Electrohydraulic jack without external oil source |
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Address after: High tech Industrial Park No. 11 High-tech Zone Gaopeng road in Chengdu city of Sichuan province 610041 2 5 storey A2, No. B1 Applicant after: Sichuan Wanguan Hydraulic Technology Co., Ltd. Address before: High tech Industrial Park No. 11 High-tech Zone Gaopeng road in Chengdu city of Sichuan province 610041 2 5 storey A2, No. B1 Applicant before: Sichuan Wanguan Electromechanical Technology Co., Ltd. |
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Address after: High tech Zone Chengdu city Sichuan province 610041 Gaopeng Road No. 3 building first floor second No. A1 Patentee after: Sichuan Wanguan Hydraulic Technology Co., Ltd. Address before: High tech Industrial Park No. 11 High-tech Zone Gaopeng road in Chengdu city of Sichuan province 610041 2 5 storey A2, No. B1 Patentee before: Sichuan Wanguan Hydraulic Technology Co., Ltd. |
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Effective date of registration: 20210302 Address after: No.228, South 4th Road, Chengdu Economic and Technological Development Zone (Longquanyi District), Chengdu, Sichuan 610000 Patentee after: SICHUAN KUNCHENGRUN TECHNOLOGY Co.,Ltd. Address before: No. second, No. first, 3 Gaoxin East Road, Chengdu hi tech Zone, No. A1 Patentee before: SICHUAN WANGUAN HYDRAULIC TECHNOLOGY Co.,Ltd. |