CN102107830A

CN102107830A - Stepless deceleration device of hydraulic part of jack

Info

Publication number: CN102107830A
Application number: CN2009102646879A
Authority: CN
Inventors: 陈有源
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-12-25
Filing date: 2009-12-25
Publication date: 2011-06-29

Abstract

The invention discloses a stepless deceleration device of a hydraulic part of a jack. The stepless deceleration device is characterized in that in a high pressure oil release loop system, an oil-return oil circuit directly communicated with an oil storage cavity and an oil-return valve rod part forming a thread pair with a threaded hole of a base are arranged at the outer part of a check valve steel ball, so as to control the opening and the closing of an oil-return valve seat; a compression spring is arranged above the oil-return check valve steel ball; an involute movable valve core arranged in a hole-shaft clearance fit manner is arranged between the compression spring and the steel ball; a hole matched with the valve core is communicated with an oil circuit directly communicated with a working oil cavity of an oil cylinder; an oil circuit is further arranged in the axial direction of the involute movable valve core; and a ring-shaped groove and a through-hole oil circuit are arranged in the radial direction of the involute movable valve core. The stepless deceleration device has the beneficial effects that as the involute movable valve core arranged in a hole-shaft clearance fit manner and the compression spring are arranged at the inner part of a conventional check valve seat, stepless adjustment of the oil return flow rate is achieved in a real sense through manual operation, and the controllability of the descending speed of the hydraulic part of the jack, which carries a load, and the running safety of the hydraulic part are guaranteed.

Description

The stepless reduction of speed device of hydraulic unit

Technical field

The present invention relates to a kind of hydraulic unit of reusing jack, be will be under the high pressure of this loaded article in the process with M/C oil circuit Dump valve behind a kind of jacking weight specifically, jack hydraulic part that fully can modulated pressure parts piston rod decline answer speed.

Background technology

Jack hydraulic part is widely used as the major part that plays heavy equipment.From prior art and common jack hydraulic part, traditional hydraulic jack top part is many to be considered from intensity, load carrying ability, onlys demand and afford to push up, and sets aside concerns, volume does not produce permanent deformation or the like after carrying down and using, and ignores the may command to jack descending speed under the heavy duty for a long time.In general, non-this field professional and technical personnel's jack user is often when discharging hydraulic unit oil return valve rod, the speed that unscrews screw thread is difficult to control, revolve not open, be exactly one to unscrew the oil return valve rod, high pressure oil in the hydraulic efficiency pressure system promptly promptly returns into shoe cream room, causes the huge vibrations of jacking thing even makes the body of jack be subjected to major injury and lost efficacy.How to solve such puzzlement, Chinese patent ZL200420078326.8 discloses a kind of hydraulic unit that has the hydraulic slow release device, it will discharge oil circuit and be arranged to oil return valve rod front and back section, sealing respectively, concrete structure is to be provided with oil return valve rod, sealing member on the oil cylinder seat, to establish drain pan and damping hole etc. on the oil return valve rod, so that the oil return valve rod when being released, can have the descending speed of level ground control jack.The author has carried out careful research with regard to this patent scheme, find that this scheme implementation difficulty is higher, especially its structural machinability is relatively poor, tooling cost is higher, and its structure can not realize infinitely regulating oil return speed, even if this product also is weak with the accordance aspect of relevant European standard.

Summary of the invention

The objective of the invention is to deficiency at above-mentioned correlation technique scheme, propose a kind ofly in general personnel operation jack, can easily unscrew fuel-return valve, and the safe release organization plan of the real-time modulated pressure parts oil return flow of energy, to overcome the deficiencies in the prior art, product manufacture simplification, operability are improved and guarantee to use steadily and reliable.

Above-mentioned purpose of the present invention is achieved through the following technical solutions: the controlled jack hydraulic part of a kind of heavily loaded speed of fall, comprise base, pump housing parts, cylinder part, piston rod part, the top cap member, outer casing part, the oil suction line system, press oily oil piping system and high pressure oil to discharge circuit system, it is characterized by: discharge in the circuit system at high pressure oil, the outer setting of check valve steel ball has with the straight-though oil return circuit of shoe cream room and with the whorl of base hole and forms the fuel-return valve rod unit of screw thread pair, fuel-return valve rod unit right side compresses or unclamps steel ball, the folding of control oil return valve seat, return check valve steel ball right side is provided with compression spring, between this compression spring and the steel ball involute moving valve core that porose axle slack cooperates is set, and and the hole that cooperates of this spool cylindrical be communicated with the oil circuit of straight-through oil cylinder working oil chamber; At the oil circuit that is axially arranged with of involute moving valve core, it radially is provided with circular groove and through hole oil circuit again.

The beneficial effect that the present invention compared with prior art has is: because the moving valve core and the compression spring of hole axle slack cooperation are set in the unidirectional valve seat of tradition inside, with M/C realization step-less adjustment oil return flow truly, guarantee that jack carries the safety of the controlled of loaded article descending speed and operation.

Description of drawings

The description of drawings of embodiment:

Figure 1 shows that the block diagram of technical solution of the present invention;

Fig. 2 is the front view of the relative Fig. 1 of the present invention;

Fig. 3 is the present invention's " A-A " cutaway view on Fig. 2;

Fig. 4 is the present invention's " B-B " cutaway view on Fig. 2.

The parts title is as follows shown in each label of accompanying drawing:

1 base, 2 pump housing parts, 3 pump cores, 4 press hand unit, 5 bearing pin parts, 6 bearing pin parts, 7 outer casing parts, 8 cylinder parts, 9 top cap members, 10 piston rod parts, 11 oil suction lines, 12 press oil circuit, 13 steel balls, 14 steel balls, 15 fuel-return valve rod units, 16 check valve steel balls, 17 oil cylinder working oil chambers, 18 involute moving valve cores, 19 circular grooves, 20 oil circuits, 21 through hole oil circuits, 22 oil circuits, 23 oil return circuits, 24 compression springs, 25 shoe cream rooms, 26 pump housing oil pockets.

The specific embodiment

The invention will be further described below in conjunction with the accompanying drawing of embodiment, will help the understanding to this case technology contents and effect, but embodiment do not constitute the restriction to the technical program.

By each accompanying drawing as seen, embodiments of the invention are building a kind of new construction schemes that redesign forms to the oil return circuit system on traditional jack hydraulic part basis, mainly contain its whole composition: connect with screw thread pair between pump housing parts 2, cylinder part 8 and the base 1, with top cap member 9 piston rod part 10, outer casing part 7 are connected firmly on base 1; With bearing

pin parts

5,6 will press hand unit 4, pump core 3 is positioned in base 1 and the pump housing parts 2, forms shoe cream room 25 in outer casing part 7, and injects hydraulic oil; Be provided with basic oil suction line 11 and check valve steel ball 14 at base 1, and be provided with and press oil circuit 12 and check valve steel ball 13, in return oil system, be provided with oil return circuit 23 and fuel-return valve rod unit 15, check valve steel ball 16, and be provided with involute moving valve core 18 in the check valve steel ball 16 enclose inside zones that are communicated with oil return circuit 22, gap between its cylindrical and the mating holes is less, and its inner end surface engages with compression spring 24; On involute moving valve core 18, offer again circular groove 19,, through hole oil circuit 21 and oil circuit 20, oil return circuit 22 connects with oil cylinder working oil chamber 17, the oil suction line 11 that is communicated with shoe cream room 25 connects through check valve steel ball 14 and pump housing oil pocket 26, and the pressure oil oil circuit 12 that is communicated with pump housing oil pocket 26 connects through check valve steel ball 13 and oil cylinder working oil chamber 17.

The embodiment of the invention is to use like this: the valve seat of at first closing fuel-return valve steel ball 16, operation is pressed and is descended crank motion on hand, make pump core 3 when top offset, hydraulic oil is inhaled into pump housing oil pocket 26 through check valve steel ball 14 valve seats, when pump core 3 is pressed down, the valve seat of high pressure oil in the pump housing oil pocket 26 through pressing oil circuit 12, check valve steel ball 13 is pressed into oil cylinder working oil chamber 17, with this reciprocation cycle, constantly makes the outside jacking weight of piston rod part.After lifting is finished using, desire to put down the automobile or the weight of lifting, just must unscrew fuel-return valve rod unit 15 in a small amount with joystick, make check valve steel ball 16 leave its valve seat, at this moment, high pressure oil in the oil cylinder working oil chamber at first through the axis hole tolerance clearance low discharge of oil circuit 22 and involute moving valve core 18 the valve seat of the check valve steel ball 16 of flowing through enter oil return circuit 23 and shoe cream room 25, piston rod part is just with slowly recovery decline reposefully of the loaded article that is positioned at its top, when the operator confirms safety and needs to accelerate descending speed, only need to unscrew lentamente again fuel-return valve rod unit 15, check valve steel ball 16 and involute moving valve core 18 are moved to the orientation of fuel-return valve rod unit 15 under the promotion of compression spring 24 gradually, in this process, circular groove 19 is along axially displacement gradually of moving valve core 18, flow area between oil circuit 22 and the circular groove 19 is strengthened gradually, high pressure oil both flowed to oil return circuit 23 through the hole axle slack of spool 18 cylindricals this moment, there is flow area to flow to oil return circuit 23 again, so just can accelerates the descending speed of piston rod through oil circuit 20 by described circular groove 19.Only need screw a little fuel-return valve rod units 15 as the jack descending speed that will slow down reliably, make check valve steel ball 16 promote spool 18 and move inward, realize the descending speed of step-less adjustment jack infinitely to reduce flow area.

Claims

1. the stepless reduction of speed device of a hydraulic unit, comprise that high pressure oil discharges circuit system, it is characterized by: discharge in the circuit system at high pressure oil, the outer setting of check valve steel ball (16) has with the straight-though oil return circuit of shoe cream room (25) (23) and with the whorl of base hole and forms the fuel-return valve rod unit (15) of screw thread pair, fuel-return valve rod unit lower surface compresses or unclamps steel ball (16), the folding of control oil return valve seat, return check valve steel ball (16) below is provided with compression spring (24), between this compression spring and the steel ball (16) the involute moving valve core (18) that porose axle slack cooperates is set.

2. the stepless reduction of speed device of a kind of hydraulic unit according to claim 1, its feature also is: the mating holes with involute moving valve core (18) cylindrical is communicated with the oil circuit (22) of straight-through oil cylinder working oil chamber.

3. the stepless reduction of speed device of a kind of hydraulic unit according to claim 1, its feature also is: involute moving valve core (18) be axially arranged with oil circuit (20), it radially is provided with circular groove (19) and through hole oil circuit (21).