CN206886589U - A kind of oil-pressure jack - Google Patents

Abstract

The utility model provides a kind of oil-pressure jack, and it includes：Fuel tank；Cylinder component；Jack body, the drainback passage of the oil inlet with first outlet and second outlet, the oil discharge passage of UNICOM's cylinder component and first outlet, UNICOM's oil discharge passage and second outlet is offered on jack body；Oil pump component, it is arranged on jack body and including pump core；Foot-driven lever, it is hinged on jack body and is connected with pump core, manually or pin steps on foot-driven lever and can drive pump core displacement, and drives oil pump component that the oil in fuel tank is imported into oil inlet using atmospheric pressure principle；Switch valve, it is integrally disposed in jack body and is adapted to drainback passage, switch valve is used to open and close drainback passage, when drainback passage is closed, oil discharge passage disconnects with second outlet and turned on first outlet, when drainback passage is opened, oil discharge passage disconnects with first outlet and turned on second outlet.This oil-pressure jack has the advantages of compact in design, good stability.

Description

A kind of oil-pressure jack

Technical field

The utility model belongs to field of mechanical technique, is related to a kind of oil-pressure jack, particularly a kind of manual/foot-operated oil Pressure type jack.

Background technology

In the prior art, the platform class vehicle such as manual platform truck, manual pallet truck is extensively using there is a jack structure, and mesh It is preceding also to have oil-pressure jack structure, but its structure setting is simple, also needs to be provided with for aiding in control flat outside jack Platform raising and the switching device declined, cause whole vehicle stability to reduce, space-consuming is larger, also increases production cost.

In summary, it is necessary to design a kind of compact in design, the oil-pressure jack of good stability.

The content of the invention

The purpose of this utility model is above mentioned problem be present for existing technology, it is proposed that a kind of compact in design, stably The good oil-pressure jack of property.

The purpose of this utility model can be realized by following technical proposal：A kind of oil-pressure jack, including：

Fuel tank；

Cylinder component, for completing raising or declining operation；

Jack body, the oil inlet with first outlet and second outlet, UNICOM's oil are offered on jack body The drainback passage of cylinder component and the oil discharge passage of first outlet, UNICOM's oil discharge passage and second outlet；

Oil pump component, it is arranged on jack body and including pump core；

Foot-driven lever, it is hinged on jack body and is connected with pump core, manually or pin steps on foot-driven lever and can drive pump Core displacement, and drive oil pump component that the oil in fuel tank is imported into oil inlet using atmospheric pressure principle；

Switch valve, it is integrally disposed in jack body and is adapted to drainback passage, the switch valve is used to open and close Drainback passage is closed, when the drainback passage is closed, oil discharge passage disconnects and turned on first outlet, the oil return with second outlet When passage is opened, oil discharge passage disconnects with first outlet and turned on second outlet.

As further improvement of the utility model, oil discharge passage and first outlet joint are provided with delivery valve, institute When stating oil discharge passage oil return, the fluid of backflow promotes delivery valve and it is blocked above-mentioned joint, now oil discharge passage and first Outlet disconnects.

Further improved as of the present utility model, the delivery valve includes being connected to jack sheet by fuel-displaced stage clip Fuel-displaced steel ball on body, during the oil discharge passage oil return, the fluid of backflow promotes fuel-displaced steel ball simultaneously to block oil discharge passage and first The joint of outlet, now oil discharge passage and first outlet disconnection.

As further improvement of the utility model, the switch valve includes being inserted in jack body and set in hollow The cover for switch put, axially it is movably installed in the middle part of cover for switch and part and stretches out the external switch valve core of jack sheet, connection Switch knob in the one end of switch valve core away from jack body, torsion is provided between switch knob and jack body Spring, is provided with the switching channels for UNICOM's drainback passage and second outlet in the middle part of cover for switch, and manipulation of switches spanner can drive Switch valve core displacement is simultaneously turned on and off switching channels.

Further improved as of the present utility model, the joint of switching channels and drainback passage is provided with switch steel Ball, manipulation of switches spanner can drive switch valve core axial displacement, now switch valve core stretch into cover for switch one end end can will Switch steel ball is pressed on above-mentioned joint or disengaged with switch steel ball.

As further improvement of the utility model, the 3rd outlet is additionally provided with oil inlet, on jack body also Offer the oil inlet passage being connected with first outlet, overload protection passage, the connector being connected with the 3rd outlet, the connector Respectively with oil inlet passage, oil discharge passage, overload protection passage UNICOM, the joint of connector and oil inlet passage is provided with oil-feed Valve, the delivery valve are arranged on the joint of connector and oil discharge passage, are provided with jack body and lead to overload protection The safety valve and the safety valve of road adaptation are one-way relief valves, and the safety valve is used to open and close overload protection passage, institute Inlet valve and delivery valve are opened when stating oil inlet passage oil-feed, now safety valve closes overload protection passage, the 3rd outlet and connection Mouthful disconnecting, during overload, fluid flow back and closes delivery valve, and now the fluid of oil inlet passage passes through connector and pushes safety valve open, Overload protection passage is opened, and fluid flows back to fuel tank via overload protection passage, the 3rd outlet.

As further improvement of the utility model, the second outlet, the 3rd outlet divide row first outlet both sides and two Person is located at oil inlet medium position, and the first outlet is arranged at oil inlet upper position, and the oil inlet passage is vertically arranged, institute State oil discharge passage to be horizontally disposed with, the overload protection passage is vertically arranged, and the connector is located at below first outlet.

Further improved as of the present utility model, the inlet valve includes being connected to jack sheet by oil-feed stage clip Oil-feed steel ball on body, the oil-feed steel ball are blocked in oil inlet passage and the joint of connector by the elastic force of oil-feed stage clip, During the oil inlet passage oil-feed, fluid pushes oil-feed steel ball and UNICOM's oil inlet passage and connector open.

Further improved as of the present utility model, the safety valve includes overload steel ball, for that will overload steel ball pressure Tightly in overload protection passage and the hold-down mechanism of connector joint, the hold-down mechanism includes the overload to connect with overload steel ball Stage clip, during overload, the fluid of oil inlet passage by connector and pushes overload steel ball open, and overload protection passage is opened.

As another improvement of the present utility model, detachably it is provided with jack body for connecting oil discharge passage With the oil connection of cylinder component, the oil connection part is stretched into oil discharge passage and connected with fuel-displaced stage clip.

Based on above-mentioned technical proposal, the utility model embodiment can at least produce following technique effect：

1st, integral structure layout is compact, and switch valve is directly integrated in inside jack, eliminates additional switching device The raising of control platform and decline, it can so ensure the stability of vehicle well, also save cost to a certain extent； Foot-driven lever, oil pump component, jack body, cylinder component etc. are fitted close, and can be reliably completed the lifting work of platform vehicle Make, and using oil pump, jack, the three-section split formula vehicle hydraulic system of oil cylinder, compared to other platform vehicle hydraulic pressure systems System, is more beneficial for maintenance conditions, while jack small volume and less weight, suitable for portable platform series vehicle.

2nd, overall oil-pressure jack reliable operation and stably, foot-driven lever is stepped on by pin, allows the oil in fuel tank due to air Pressure principle begins to flow into jack from oil inlet, and now switch valve closes drainback passage, and oil discharge passage and second outlet disconnect, So fluid can only enter oil discharge passage from first outlet and eventually enter into cylinder component, and then complete the raising operation of platform； After switch valve is opened, drainback passage is opened, and oil discharge passage and second outlet conducting, cylinder component is in weight and fluid itself weight Start the fluid that flows back under power, now oil discharge passage and first outlet disconnect, and the oil of backflow can only lead to from oil discharge passage by oil return Road, second outlet are back to oil inlet, and finally flow back to the decline operation that fuel tank completes platform.

Brief description of the drawings

Specific embodiment of the present utility model is described in further detail below in conjunction with the accompanying drawings, wherein：

Fig. 1 is the structural representation of the preferred embodiment of the utility model one.

Fig. 2 is the structural representation at another visual angles of Fig. 1.

In figure, 10, jack body；11st, oil inlet；111st, first outlet；112nd, second outlet；113rd, the 3rd outlet； 12nd, oil discharge passage；13rd, drainback passage；14th, oil inlet passage；15th, overload protection passage；16th, connector；161st, unloading port；20、 Oil pump component；21st, pump core；30th, foot-driven lever；40th, switch valve；41st, cover for switch；411st, switching channels；42nd, switch valve core；43、 Switch knob；44th, torsion spring；45th, steel ball is switched；46th, holding screw；50th, delivery valve；51st, fuel-displaced stage clip；52nd, fuel-displaced steel ball； 60th, inlet valve；61st, oil-feed stage clip；62nd, oil-feed steel ball；70th, safety valve；71st, steel ball is overloaded；72nd, stage clip is overloaded；73rd, sheath； 74th, adjusting screw；75th, sealing ring；80th, oil drain valve；90th, oil connection.

Embodiment

It is specific embodiment of the utility model and with reference to accompanying drawing below, the technical solution of the utility model is made further Description, but the utility model is not limited to these embodiments.

Technical scheme provided by the utility model is illustrated in more detail with reference to Fig. 1 to Fig. 2.

As depicted in figs. 1 and 2, this oil-pressure jack includes：

Fuel tank (not shown), store the oil of flow-like；

Cylinder component (not shown), for completing the platform raising of vehicle or declining operation；

Jack body 10, as main support carrier, offered on jack body 10 with first outlet 111 Oil discharge passage 12, the UNICOM's oil discharge passage 12 of oil inlet 11, UNICOM's cylinder component and first outlet 111 with second outlet 112 With the drainback passage 13 of second outlet 112, the entrance of oil inlet 11 is connected with fuel tank；

Oil pump component 20, the pump core 21 for being arranged on jack body 10 and being set including activity；

Foot-driven lever 30, be preferably connected by hinge on jack body 10 and with pump core 21, manually or Pin, which steps on foot-driven lever 30, can drive the displacement of pump core 21, and drive oil pump component 20 to import the oil in fuel tank using atmospheric pressure principle Oil inlet 11；

Switch valve 40, it is integrally disposed in jack body 10 and is adapted to drainback passage 13, the switch valve 40 is used for Drainback passage 13 is opened and closed, when the drainback passage 13 is closed, oil discharge passage 12 disconnects with second outlet 112 and with first The conducting of outlet 111, when the drainback passage 13 is opened, oil discharge passage 12 disconnects with first outlet 111 and led with second outlet 112 It is logical；I.e. switch valve 40, which can open drainback passage 13, turns on oil discharge passage 12 and second outlet 112, now the He of oil discharge passage 12 First outlet 111 disconnects, and switch valve 40 can also close drainback passage 13, and now oil discharge passage 12 and first outlet 111 turn on, Oil discharge passage 12 and second outlet 112 disconnect.

The utility model protects a kind of oil-pressure jack, can be that hand oil-pressure formula jack/foot-operated hydraulic type is very heavy Top, preferably foot-operated oil-pressure jack, its small volume and less weight, suitable for portable platform series vehicle.

In the utility model, fuel tank and cylinder component may belong to platform vehicle other local parts, can also A part as oil-pressure jack of the present utility model.

Above-mentioned oil pump component 20 further preferably includes the hydraulic oil pump housing, such oil pump component 20, foot-driven lever 30 and fuel tank composition The power unit of the utility model hydraulic system, above-mentioned foot-driven lever 30 are connected directly between on jack by bearing pin, with oil pump group The pump core 21 of part 20 directly contacts, by constantly trample or manually operated foot-driven lever 30 caused by mechanical energy be converted into fluid Pressure energy enters directly into jack from fuel tank, and wherein oil pump component 20 is preferably threaded on jack body 10, can be square Just demolition and maintenance.

This oil-pressure jack integral structure layout is compact, and switch valve 40 is directly integrated in inside jack, eliminated Additional switching device carrys out raising and the decline of control platform, can so ensure the stability of vehicle well, also in certain journey Cost has been saved on degree；Foot-driven lever 30, oil pump component 20, jack body 10, cylinder component etc. are fitted close, can be reliably The lifting work of platform vehicle is completed, and the utility model is using oil pump, jack, the three-section split formula vehicle hydraulic pressure of oil cylinder System, compared to other platform automobile hydraulic systems, maintenance conditions, while jack small volume and less weight are more beneficial for, suitable for light Just platform series vehicle.

This oil-pressure jack reliable operation, stably, the raising of its control platform and to decline principle as follows：Pin is stepped on by pin Treadle 30, the oil allowed in fuel tank is because atmospheric pressure principle from oil inlet 11 begins to flow into jack, and now switch valve 40 is closed Drainback passage 13, oil discharge passage 12 and second outlet 112 disconnect, so fluid can only enter oil discharge passage from first outlet 111 12 and cylinder component is eventually entered into, and then complete the raising operation of platform；After switch valve 40 is opened, drainback passage 13 is opened, Oil discharge passage 12 and second outlet 112 turn on, and cylinder component starts the fluid that flows back under weight and fluid self gravitation, now goes out Oily passage 12 and first outlet 111 disconnect, and the oil of backflow can only pass through drainback passage 13, second outlet 112 from oil discharge passage 12 Oil inlet 11 is back to, and finally flows back to the decline operation that fuel tank completes platform.

It is worth mentioning that：When the utility model jack is applied into platform vehicle, the decline of the vehicle platform is logical Cross open switch valve 40 and coordinate platform, weight, fluid own wt and realize, i.e., fluid obtains oil return under gravity Power, rather than by toward fluid is drawn back to operate in fuel tank, smart structural design, ensure that the stability of the course of work.

Further, make it that overall work is relatively reliable, the reliability of guarantee oil return work (i.e. platform declines operation), Oil discharge passage 12 and the joint of first outlet 111 are provided with delivery valve 50, during 12 oil return of oil discharge passage, the fluid of backflow Promote delivery valve 50 and it is blocked above-mentioned joint, now oil discharge passage 12 disconnects with first outlet 111, and the fluid of backflow is only Oil inlet 11 can be back to by second outlet 112 by return flow line and the fuel tank that finally flows back, delivery valve 50 act on similar unidirectional Valve；During 12 oil-feed of oil discharge passage, the fluid that first outlet 111 flows out pushes delivery valve 50 open and enters oil cylinder group by oil discharge passage 12 Part, the now closing of switch valve 40 drainback passage 13, disconnects oil discharge passage 12 and second outlet 112.

As a kind of preferred or optional embodiment, delivery valve 50 includes being connected to jack body by fuel-displaced stage clip 51 Fuel-displaced steel ball 52 on 10, during 12 oil return of oil discharge passage, the fluid of backflow promotes fuel-displaced steel ball 52 simultaneously to block oil discharge passage 12 disconnect with the joint of first outlet 111, now oil discharge passage 12 with first outlet 111；During oil-feed, first outlet 111 flows The fluid gone out pushes fuel-displaced steel ball 52 open and enters cylinder component by oil discharge passage 12, and now above-mentioned joint is opened；It is such The structure setting of structure delivery valve 50 is reasonable, compact, ensures the reliability of work.

Further, to ensure the compactedness of the reliability of the work of switch valve 40 and overall jack structure layout, especially It is the structural compactness that switch valve 40 is integrated in jack body 10, preferably switch valve 40 includes being inserted in jack body 10 Cover for switch 41 that is interior and being in hollow setting, axially it is movably installed in the middle part of cover for switch 41 and part stretching jack body 10 Outer switch valve core 42, the switch knob 43 for being connected to the one end of switch valve core 42 away from jack body 10, in switch knob Torsion spring 44 is provided between 43 and jack body 10, is provided with the middle part of cover for switch 41 and is used for UNICOM's drainback passage 13 and second The switching channels 411 of outlet 112, manipulation of switches spanner 43 can drive the displacement of switch valve core 42 and be turned on and off switching channels 411。

In raising operation, manipulation of switches spanner 43 rotates and drives the straight-line displacement of switch valve core 42 to cause switching channels 411 close, and now drainback passage 13 and second outlet 112 disconnect, i.e. oil discharge passage 12 and second outlet 112 disconnects, switch valve 40 are closed, fluid enters cylinder component completion platform by fuel tank by first outlet 111, oil discharge passage 12 Rise；When declining operation, switching channels 411 are opened so that oil discharge passage 12, drainback passage 13, second outlet 112 turn on, this When oil return fluid promote delivery valve 50 to disconnect oil discharge passage 12 and first outlet 111 (closure first outlet 111), fluid stream It is recycled to fuel tank in through oil discharge passage 12, drainback passage 13, switching channels 411, second outlet 112 and by oil inlet 11, is completed The decline of platform.

The setting of above-mentioned torsion spring 44 then can be very good controlling switch rotational steps, can complete the switch of switch valve 40 Amount, so reliably, control fluid return flow exactly, i.e. control platform declines displacement, it is ensured that platform declines process Stationarity, avoids dramatic decrease or collision phenomenon that rapid drawdown is brought.

Further, the joint of switching channels 411 and drainback passage 13 is provided with switch steel ball 45, manipulation of switches Spanner 43 can drive the axial displacement of switch valve core 42, and now switch valve core 42 stretches into one end end of cover for switch 41 and will can switched Steel ball 45 is pressed on above-mentioned joint or disengaged with switch steel ball 45.

When lifting operation, switch valve core 42 is pressed on above-mentioned joint by steel ball 45 is switched, and now switching channels 411 are pass Closed state, disconnect drainback passage 13 and second outlet 112；When declining operation, switch valve core 42 disengages with switch steel ball 45, Now switch steel ball 45 is active, and drainback passage 13, switching channels 411, second outlet 112 turn on, the fluid of backflow Fuel-displaced steel ball 52 (delivery valve 50) is promoted to close first outlet 111, fluid intelligence is by oil discharge passage 12, drainback passage 13, switch Passage 411, second outlet 112 are back to fuel tank through oil inlet 11 again.

To ensure the reliability and stability of overall jack structure layout, preferably cover for switch 41 passes through holding screw 46 It is further spacing on jack body 10, and the holding screw 46 at this is vertical with cover for switch 41；Torsion spring 44 passes through interior six Angle screw is fixed on valve element, and the soket head cap screw at this is located at the outside of jack body 10.

To ensure the reliability and stability of jack work, overcome overload condition, be preferably additionally provided with oil inlet 11 3rd outlet 113, oil inlet passage 14 and the 3rd outlet being connected with first outlet 111 are further opened with jack body 10 113 connected overload protection passages 15, connector 16, the connector 16 respectively with oil inlet passage 14, oil discharge passage 12, overload The UNICOM of passage 15 is protected, the joint of connector 16 and oil inlet passage 14 is provided with inlet valve 60, the delivery valve 50 is set In connector 16 and the joint of oil discharge passage 12, the peace being adapted to overload protection passage 15 is provided with jack body 10 Full valve 70 and the safety valve 70 are one-way relief valves 70, and the safety valve 70 is used to open and close overload protection passage 15, institute Inlet valve 60 and delivery valve 50 are opened when stating 14 oil-feed of oil inlet passage, now the closing overload protection of safety valve 70 passage 15, the 3rd Outlet 113 and connector 16 disconnect, and during overload, fluid flow back and closes delivery valve 50, now the fluid process of oil inlet passage 14 Connector 16 simultaneously pushes safety valve 70 open, and overload protection passage 15 is opened, and fluid exports 113 via overload protection passage the 15, the 3rd Flow back to fuel tank.

Above-mentioned safety valve 70 and integrated form are arranged on jack body 10, are reduced external structure setting, be ensure that The stability of overall jack work, during work (during raising), fluid flows into from oil inlet 11, by first outlet 111, oil-feed Passage 14 simultaneously pushes up the fuel-displaced steel ball 52 for outputing fuel tap 50, and fluid flows into oil discharge passage 12 and enters cylinder component；Weight on platform When thing overloads, fluid can be flowed back after flowing into oil cylinder, and the fuel-displaced steel ball of delivery valve 50 is promoted after fluid fills full oil discharge passage 12 The corresponding joint of 52 closure, the now no longer oil-feed of oil discharge passage 12, the fluid that oil inlet passage 14 flows out can only lead to from overload protection Road 15 enters, and pushes safety valve 70 open by corresponding joint and opens overload protection passage 15, fluid by overload protection passage 15, 3rd outlet 113, oil inlet 11 flow back to fuel tank, and overload protection is carried out to vehicle.

Preferably, to ensure that fluid is fuel-displaced, oil return is smooth, blocking phenomenon is avoided, ensures operating efficiency and reliability, the Two outlets the 112, the 3rd export 113 points of both sides of row first outlet 111 and the two is located at the medium position of oil inlet 11, and described first goes out Mouth 111 is arranged at the upper position of oil inlet 11, and the oil inlet passage 14 is vertically arranged, and the oil discharge passage 12 is horizontally disposed, institute State overload protection passage 15 to be vertically arranged, the connector 16 is located at the lower section of first outlet 111；Vertical overload protection passage 15 More conducively normal hoisting operation when, fluid will not pass back into overload protection passage 15, and just safety valve 70 is driven on top during overload.

Further, the upper position of connector 16 is provided with unloading port 161 and corresponding oil drain valve 80, i.e., very heavy Top/bottom part leaves unloading port 161, and the oil drain valve 80 that need to only unclamp bottom (is preferably threaded on jack body 10, unclamped When need to only turn on oil drain valve 80), internal oil can be allowed to flow out, facilitate whole jack internal cleaning.

To ensure the reliability of oil inlet passage 14 and the docking of connector 16, ensure check valve effect, inlet valve 60 includes logical Cross the oil-feed steel ball 62 that oil-feed stage clip 61 is connected on jack body 10, the bullet that the oil-feed steel ball 62 passes through oil-feed stage clip 61 Power is blocked in oil inlet passage 14 and the joint of connector 16,14 oil-feed of oil inlet passage, and fluid pushes oil-feed steel ball 62 open And UNICOM's oil inlet passage 14 and connector 16, the elastic force F1 (maximum flexibility restoring force) of oil-feed stage clip 61 are more than the bullet of fuel-displaced spring Power F2, due to F1 ＞ F2, during raising, fluid enters oil discharge passage 12 by oil inlet passage 14 and flows into cylinder component.

To ensure the reasonability of overcurrent protection structure setting, ensure overload protection reliable operation, preferred security valve 70 includes Overload steel ball 71, the hold-down mechanism for overload steel ball 71 to be pressed in overload protection passage 15 and the joint of connector 16, institute State hold-down mechanism include with the overload stage clip 72 that connects of overload steel ball 71, during overload, the fluid of oil inlet passage 14 passes through connector 16 and push overload steel ball 71 open, overload protection passage 15 opens.

In the present case, preferably overload steel ball 71 is located in overload protection passage 15, and oil-feed steel ball 62 is located in connector 16, Fuel-displaced steel ball 52 is located in oil discharge passage 12, and switch steel ball 45 is located in switching channels 411.

The sheath 73 for being installed on the outside of jack body 10 that further, above-mentioned hold-down mechanism also includes setting gradually, The adjusting screw 74 in sheath 73 and being inserted on jack body 10 is placed in, overload stage clip 72 is connected to adjusting screw 74 and mistake Between load steel ball 71.

Further, to ensure the tight fit between overall jack compact in design and each structure, one is formed Closely, compact jack structure, above-mentioned one end of torsion spring 44 are fixed in switch valve core 42 by soket head cap screw, other end top Lean against on the sheath 73 of safety valve 70.

Sealing ring 75 is provided between the outer wall of adjusting screw 74 and jack body 10, for avoid sealing ring 75 by comprising In the stroke of the screw thread of adjusting screw 74, sealing ring 75 is caused to cause sealing ring 75 to damage with thread contact, safety valve 70 exists Sealing effectiveness repeatedly is influenceed after regulation, 70 pressurizes of safety valve are caused, so as to trigger danger；This case is made further Improve, regulation screw position is moved down, avoids contacting with sealing ring 75, i.e., the sealing ring 75 in this case is arranged at adjusting screw 74 Screw position above.

It is preferred that hydraulic oil is conveyed to oil cylinder by this jack by oil pipe completes raising process, cylinder component is holding for this case Row unit, specifically, being detachably provided with the oil pipe for connecting oil discharge passage 12 and cylinder component on jack body 10 Joint 90, the part of oil connection 90 are stretched into oil discharge passage 12 and connected with fuel-displaced stage clip 51.

In summary, this oil-pressure jack is a kind of small volume and less weight type jack, is integrated with switch valve 40, safety valve 70th, the important component such as oil drain valve 80, though the small the five internal organs of sparrow are various, other applied mechanical constructional devices are eliminated.

It is as follows that fluid flows into process：Manually control or pin step on foot-driven lever 30, allow the oil in fuel tank due to atmospheric pressure Strong principle begins to flow into jack from oil inlet 11, and there are three holes (i.e. three outlets of oil inlet 11) porch, due to second Export 112 switch valve cores 42 not open, overload steel ball 71 corresponding to the 3rd outlet 113 withstands (similar check valve), institute by stage clip Oil inlet passage 14 can only be entered from first outlet 111 with fluid；As oily steel ball 62 is driven on the increasing top of oil liquid pressure into, due to Above-mentioned F1 ＞ F2, so fluid flows into oil discharge passage 12 and enters the raising that oil cylinder completes platform.

Fluid reflux course is as follows：After switch valve core 42 is opened, due to starting back under weight and fluid self gravitation Flow, fuel-displaced steel ball 52 withstands (similar check valve) by stage clip at oil discharge passage 12, so can only be from drainback passage 13, switching channels 411st, second outlet 112 flows back to the decline process that fuel tank completes platform.

Overload condition is as follows：Fluid is flowed into from oil inlet 11, and oil discharge passage 12 is flowed into by oil inlet passage 14, but due to weight Thing overloads, and fluid flows back after flowing into oil cylinder, is just no longer flow into, can only lead to from overload protection after fluid fills full oil discharge passage 12 Road 15 flows back to fuel tank by safety valve 70 and carries out overload protection to vehicle.

Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute Category those skilled in the art can make various modifications or supplement to described specific embodiment or using similar Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.

Claims (10)

1. a kind of oil-pressure jack, including：

Fuel tank；

Cylinder component, for completing raising or declining operation；

It is characterized in that：

Jack body, the oil inlet with first outlet and second outlet, UNICOM's oil cylinder group are offered on jack body The drainback passage of part and the oil discharge passage of first outlet, UNICOM's oil discharge passage and second outlet；

Oil pump component, it is arranged on jack body and including pump core；

Foot-driven lever, it is hinged on jack body and is connected with pump core, manually or pin steps on foot-driven lever and can drive pump core position Move, and drive oil pump component that the oil in fuel tank is imported into oil inlet using atmospheric pressure principle；

Switch valve, it is integrally disposed in jack body and is adapted to drainback passage, the switch valve is used to open and close back Oily passage, when the drainback passage is closed, oil discharge passage disconnects and turned on first outlet, the drainback passage with second outlet During unlatching, oil discharge passage disconnects with first outlet and turned on second outlet.

A kind of 2. oil-pressure jack according to claim 1, it is characterised in that：Docked in oil discharge passage with first outlet Place is provided with delivery valve, and during the oil discharge passage oil return, the fluid of backflow promotes delivery valve its is blocked above-mentioned joint, this When oil discharge passage and first outlet disconnect.

A kind of 3. oil-pressure jack according to claim 2, it is characterised in that：The delivery valve is included by going out oil pressure Spring is connected to the fuel-displaced steel ball on jack body, and during the oil discharge passage oil return, the fluid of backflow promotes fuel-displaced steel ball simultaneously to seal The joint of stifled oil discharge passage and first outlet, now oil discharge passage and first outlet disconnection.

A kind of 4. oil-pressure jack according to claim 1, it is characterised in that：The switch valve is very heavy including being inserted in In the body of top and it is movably installed in the cover for switch of hollow setting, axial direction in the middle part of cover for switch and jack body is stretched out in part Outer switch valve core, the switch knob for being connected to the one end of switch valve core away from jack body, in switch knob and jack Torsion spring is provided between body, the switching channels for UNICOM's drainback passage and second outlet, behaviour are provided with the middle part of cover for switch Control switch knob can drive switch valve core displacement and be turned on and off switching channels.

A kind of 5. oil-pressure jack according to claim 4, it is characterised in that：In switching channels and pair of drainback passage The place of connecing is provided with switch steel ball, and manipulation of switches spanner can drive switch valve core axial displacement, and now it is outer to stretch into switch for switch valve core Switch steel ball can be pressed on above-mentioned joint or be disengaged with switch steel ball by one end end of set.

A kind of 6. oil-pressure jack according to claim 2, it is characterised in that：The 3rd is additionally provided with oil inlet to go out Mouth, the oil inlet passage for being further opened with being connected with first outlet on jack body, the overload protection being connected with the 3rd outlet lead to Road, connector, the connector with oil inlet passage, oil discharge passage, overload protection passage UNICOM, lead in connector and oil-feed respectively The joint in road is provided with inlet valve, and the delivery valve is arranged on the joint of connector and oil discharge passage, in jack body On to be provided with the safety valve of overload protection path adaptation and the safety valve be one-way relief valves, the safety valve be used to open and Overload protection passage is closed, inlet valve and delivery valve are opened during the oil inlet passage oil-feed, now safety valve closes overload protection Passage, the 3rd outlet and connector disconnect, and during overload, fluid flow back and closes delivery valve, now the fluid process of oil inlet passage Connector simultaneously pushes safety valve open, and overload protection passage is opened, and fluid flows back to fuel tank via overload protection passage, the 3rd outlet.

A kind of 7. oil-pressure jack according to claim 6, it is characterised in that：The second outlet, the 3rd outlet point Row first outlet both sides and the two be located at oil inlet medium position, the first outlet is arranged at oil inlet upper position, described Oil inlet passage is vertically arranged, and the oil discharge passage is horizontally disposed with, and the overload protection passage is vertically arranged, and the connector is located at Below first outlet.

A kind of 8. oil-pressure jack according to claim 6, it is characterised in that：The inlet valve is included by entering oil pressure Spring is connected to the oil-feed steel ball on jack body, the oil-feed steel ball by the elastic force closure of oil-feed stage clip in oil inlet passage and The joint of connector, during the oil inlet passage oil-feed, fluid pushes oil-feed steel ball and UNICOM's oil inlet passage and connector open.

A kind of 9. oil-pressure jack according to claim 6, it is characterised in that：The safety valve include overload steel ball, For overload steel ball to be pressed in the hold-down mechanism of overload protection passage and connector joint, the hold-down mechanism includes and mistake Carry the overload stage clip that connects of steel ball, during overload, the fluid of oil inlet passage by connector and pushes overload steel ball open, and overload protection leads to Open in road.

A kind of 10. oil-pressure jack according to any one of claim 1 to 9, it is characterised in that：On jack body The detachable oil connection being provided with for connecting oil discharge passage and cylinder component, oil discharge passage is stretched into the oil connection part It is interior and connect with fuel-displaced stage clip.