CN2464704Y

CN2464704Y - Double-speed hydraulic jack

Info

Publication number: CN2464704Y
Application number: CN 01217506
Authority: CN
Inventors: 尹建国; 沈民
Original assignee: JIANGSU TONGRUN ELECTROMECHANIAL GROUP CO Ltd
Current assignee: JIANGSU TONGRUN ELECTROMECHANIAL GROUP CO Ltd
Priority date: 2001-02-21
Filing date: 2001-02-21
Publication date: 2001-12-12
Anticipated expiration: 2011-02-21

Abstract

The utility model discloses a hydraulic jack which can lift at high speed on the occasion of zero load and can lift steadily on the occasion of load. The hydraulic jack comprises a combined high-low-pressure pump structure. The hydraulic jack is also provided with a low-pressure quick pump oil circuit, a high-pressure slow pump oil circuit and a releasing circuit to control the lifting operation of a piston rod assembly of an oil cylinder and realize automatic change of the lifting speed. The utility model has the characteristics of simple structure, good manufacturability, stable using performance and high work efficiency.

Description

The dual-speed hydraulic jack

The utility model relates to a kind of hydraulic jack, and is especially a kind of when jack does not touch load, can make the zooming dual-speed hydraulic jack of its piston rod.

Existing hydraulic jack mostly adopts single pump core manual pump to handle working barrel wicking oil and presses oily process to operating cylinder, no matter from load how far jacking header, can only provide pressure oil to operating cylinder with the pressure oil mass that is equal to oil absorption, so jack piston rod is having load and is all hoisting with same speed when non-loaded, cause lose time, effect is low." top, the manual vertical hydraulic of Chinese patent ZL93220041.9 double speed thousand Rooms " discloses the technical scheme of setting up piston pair on original jack big piston bar basis: its jack at first is pressed into the pressure oil of pump core suction the inner cylinder tube of big piston bar during in zero load through a check valve, make the big piston bar utilize less pressure oil to produce fast offset, and the automatic repairing of unidirectional Fill valve by the oil cylinder outer cylinder, to guarantee after jack top and load, simultaneously pressure oil being pressed into outer cylinder through hydraulic control one-way valve, cause the lifting velocity of big piston bar slow by transferring to soon by the pump core.Yet, because this hydraulic jack inner cylinder tube is arranged on the operating cylinder inside that is difficult for assembling and setting, caused the jack structure complexity, defectives such as manufacturability is not good enough, in-use performance instability.

The purpose of this utility model is that a kind of simple in structure, assembly process process good, in-use performance is stable quick jack will be provided, and makes it when zero load, and fast rise transfers to during load at a slow speed automatically with lifting weight reposefully.

The purpose of this utility model is achieved in that a kind of fast hydraulic pressure thousand Rooms tops, by base 26, oil cylinder 29, piston component 27, piston rod 8, overcoat 30, overcoat corner sealing 28, top cap assembly 7, the pump housing 22, pump core 21, press hand connecting rod 46, press hand 10, Dump valve assembly 2 etc. forms.Described base 26 is provided with pump assembly, the fast pump oil piping system of low pressure, the slow pump oil piping system of high pressure, discharges oil piping system.

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is further described.

Fig. 1 is a front view of the present utility model.

Fig. 2 is the utility model front view " E-E " section-drawing.

Fig. 3 is a birds-eye view of the present utility model.

Fig. 4 is Fig. 1's " A-A " cutaway view.

Fig. 5 is Fig. 1's " C-C " cutaway view.

Fig. 6 is Fig. 1's " B-B " cutaway view.

Fig. 7 is Fig. 3's " D-D " revolved sectional view.

Pump assembly of the present utility model is made up of packing seal 47, the pump housing 22,

seal ring

24 and 20, sealing member 23, pump core 21, pump core print 13, sealing member 18, pump housing cover 17.The blind hole of its pump core epimere step cylindrical 14 and pump core print 13 realizes radially leaving the mechanical attachment of appropriate gap.The pump housing 22 is connected with base 26 by screw thread pair, packing seal 47.The step cylindrical of the pump housing 22 at seal ring 24 places cooperates with base 26 associated orifices and seals, and the hole cooperates and forms to move and seals within the pump housing 22 top cylindricals 52 and sealing member 20 and the pump housing cover 17.The oil circuit 44,45 that the pump housing 22 axially is provided with is communicated with low pressure oil pump chamber 19 and annular Oil Guide chamber 34 respectively.The cylindrical that pump core print 13 is positioned at sealing member 18 places and the pump housing overlap 17 endoporus and cooperate and seal.Pump core print 13 overlaps 17 in step surface 16 place's axial location with the pump housing, and overlaps 15 places, 17 upper ends at the pump housing and close up fixing.Pump core print 13 tops of pump assembly are penetrated with the pin shaft hole of pressing hand 10 by bearing pin 12, pin 11 and the pin shaft hole of itself and axial restraint realizes that rotation connects.Press hand 10 and rotate and connects with pressing hand connecting rod 46, press hand connecting rod 46 and connect with fixed orifice rotation on the base 26 by coupling spindle assembly 5 by adapter shaft assembly 1.Oil cylinder 29 and base 26 are with thread connection, and end face has a packing seal 48 under the oil cylinder 29.

The composition of the fast pump oil piping system of low pressure of the present utility model is: the check valve of oil circuit 32 through steel ball 36, compression spring 37 are arranged of straight-through shoe cream room 31 insert fast pump oil suction line 33, annular Oil Guide chamber 34, oil circuit 44,45, until low pressure oil pump chamber 19, and insert high pressure oil pump chambers 25 through check valve steel ball 35.When jack is unloaded, belong to low pressure oil together by pump chamber 25 oil that extrudes and the oil that extrudes from pump chamber 19, can cause piston rod 8 fast rise simultaneously to oil cylinder working oil chamber 49 high capacity fuel feeding; The oil that low pressure oil pump chamber 19 extrudes is through oil circuit 44,45, annular Oil Guide chamber 34, oil circuit 41, oil circuit 50 and high capacity in line check valve steel ball 40, enter oil cylinder working oil chamber 49, if jack top and a certain amount of load of tool, then because the raising of oil pressure and when being passed to oil circuit 50 in the oil cylinder working oil chamber 49, hydraulic control fuel-return valve 39 self-openings, just can only hydraulic control fuel-return valve 39 through opened through oil circuit 38 time go into shoe cream room 31 from the pressure oil of described low pressure oil pump chamber 19 this moment.

The composition of the slow pump oil piping system of high pressure of the present utility model is: the oil circuit 32 of straight-through shoe cream room 31 is through containing the check valve of steel ball 36 and compression spring 37, and through check valve steel ball 35 access high pressure oil pump chambers 25, when the jack load, pump chamber 25 is through oil circuit 42, check valve steel ball 43, be pressed into high pressure oil to oil cylinder working oil chamber 49, realize piston rod 8 lifting load reposefully at a slow speed.

The composition of release circuit system of the present utility model is: the oil circuit 4 that links to each other with oil cylinder working oil chamber 49, lead to stepped hole 51 places that connect shoe cream room 31 at it, Dump valve assembly 2 with base 26 thread connection is set, one end head and Dump valve steel ball 6 screw, unscrew by screw thread pair, finish the closed and unlatching of steel ball 6, realize the pressurize and the unloading of oil cylinder working oil chamber 49 are drained the oil at oil circuit 4 aperture valve seats.

The utility model is to come work like this: when jack is in underloading or light condition, lift handle 9, at this moment the pump core print 13 and pump housing cover 17, associating pump core 21 is upward movement together, pump chamber 19 produces vacuum with pump chamber 25, by atmospheric effect, the hydraulic oil of shoe cream room 31 is through oil circuit 32, check valve steel ball 36 back shuntings: pass check valve steel ball 35, suck high pressure pump chamber 25 and pass oil circuit 33, annular Oil Guide chamber 34, pump housing oil circuit 44,45 suck low pressure pump chamber 19, then, depress handle 9, at this moment the pump core print 13 and pump housing cover 17, associating pump core 21 moves downward synchronously, and the hydraulic oil in pump chamber 19 and the pump chamber 25 will enter oil cylinder working oil chamber 49 through oil circuit separately: the hydraulic oil in the pump chamber 19 is through oil circuit 44,45, annular Oil Guide chamber 34, oil circuit 41 and oil circuit 50, check valve steel ball 40 is pressed into oil cylinder working oil chamber 49; Hydraulic oil in the high pressure pump chamber 25 enters oil cylinder working oil chamber 49 through oil circuit 42, check valve steel ball 43, described two strands of fluid import oil cylinder simultaneously, impel piston rod 8 quick travel, when jack piston rod 8 tops and load or oil pressure surpass force value by 39 preset of hydraulic control fuel-return valve, above-mentioned hydraulic oil from low pressure pump chamber 19 is with regard to the unable check valve steel ball 40 that backs down, and can only be back to shoe cream room 31 by the hydraulic control fuel-return valve 39 through having opened, and no longer enter oil cylinder working oil chamber 49.At this moment, the hydraulic oil from high pressure pump chamber 25 then continues to be pressed into the high pressure oil that makes piston rod 8 lifting loads to oil cylinder working oil chamber 49 through oil circuit 42, check valve 43.

When the jack end-of-job, slowly unscrew Dump valve assembly 2, then steel ball 6 leaves the valve line seat on the oil circuit 4, and the high pressure oil in the oil cylinder working oil chamber 49 will flow into and shoe cream room 31 straight-though release oil circuits 3 through stepped hole 51 lentamente.

The utility model is owing to adopted compound type dual-pressure pump cavity configuration, and oil suction simultaneously, pressure oil also are equipped with hydraulic control fuel-return valve 39 preset oil pressure values, the auto-closing of valve 39 when realizing zero load or underloading; When reaching certain load, valve 39 self-openings and the pressure oil trend of conversion low pressure pump chamber, thus make jack underloading when unloaded (or) fast rise, slow lifting weight reposefully during heavy duty (or load).

Claims

1. dual-speed hydraulic jack, by base, oil cylinder, piston rod, package assembly, top cap spare, pump housing pump chipware, press the hand connecting rod, Dump valve is formed, oil cylinder and base, the pump housing and base, top cap and oil cylinder are thread connection.It is characterized in that: the step cylindrical that the pump housing (22) is located at seal ring (24) cooperates with base (26) associated orifices and seals, the pump housing (22) top cylindrical (52) and sealing member (20) cooperate with hole within the pump housing cover (17) and form motion sealing, the pump housing (22) axially is provided with oil circuit (44), (45) be communicated with low pressure pump chamber (19) and annular Oil Guide chamber (34) respectively, pump core print (13) is positioned at cylindrical that sealing member (18) locates and cooperates with the endoporus of pump housing cover (17) and seal, pump core print (13) is located axial location with pump housing cover (17) at step surface (16), and makes pump housing cover (17) upper end (15) locate to close up fixing; Base (26) is provided with the fast pump oil piping system of low pressure, one end of oil circuit (32) links to each other with shoe cream room (31), the check valve of its other end through containing steel ball (36), compression spring (37) is communicated with oil circuit (33), annular Oil Guide chamber (34), and passes to low pressure oil pump chamber (19) through oil circuit (44), (45); Base (26) is provided with the slow pump oil piping system of high pressure, the oil circuit (32) of straight-through shoe cream room (31) inserts high pressure oil pump chamber (25) through check valve (36,37), check valve (35), during the jacking load, what its pump chamber (25) was pressed into to oil cylinder working oil chamber (49) is high pressure oil; When zero load, what its pump chamber (25) extruded is low pressure oil, and the high capacity fuel feeding that it incorporates the fast pump oil circuit of low pressure into orders about piston rod (8) quick travel.

2. dual-speed hydraulic jack according to claim 1 is characterized in that: an end of the fast pump oil circuit of low pressure (50) is provided with hydraulic control fuel-return valve assembly (39).

3. dual-speed hydraulic jack according to claim 1, its feature also is: pump core (21) upper step (14) and pump core print (13) realize radially leaving the connection of appropriate gap with the conventional mechanical connecting mode.