CN201980932U

CN201980932U - Oil pressure hoisting jack with secure release valve

Info

Publication number: CN201980932U
Application number: CN2011200622942U
Authority: CN
Inventors: 陈有源; 徐俊阳
Original assignee: CHANGSHU OUQU KNITTING MACHINERY Co Ltd
Current assignee: CHANGSHU OUQU KNITTING MACHINERY Co Ltd
Priority date: 2011-03-11
Filing date: 2011-03-11
Publication date: 2011-09-21
Anticipated expiration: 2021-03-11

Abstract

The utility model discloses an oil pressure hoisting jack with a secure release valve. An automatic valve device intersecting with a high-pressure oil discharging channel is arranged inside a high-pressure oil releasing return channel, a high pressure flow guide oil channel arranged inside an oil cylinder base is communicated with an oil cylinder work oil chamber of the hoisting jack and a lower cavity of a big piston, a cavity extending section of a valve piston cavity intersecting with the high pressure oil discharging channel is arranged above a valve piston, a match cavity contains a compression spring, the valve piston and the valve piston cavity form a small shifting pair, the big piston and the match cavity form a big shifting pair, wherein the small shifting pair and the big shifting pair are respectively provided with a small sealing member and a big sealing member, and a locating screw with a sealing member is arranged below the big piston and connected with the oil cylinder base through a thread pair. The oil pressure hoisting jack with the secure release valve has the advantages that automatic control of the size of an oil return outlet at the position of the valve piston cavity is realized by adopting the fact that flow and pressure are guided from the oil cylinder work oil cavity, thereby enabling a loaded piston rod to be stable, slow, safe and reliable during the reset and release process.

Description

The pressure oil lift of tool safety-type Dump valve

Technical field

The utility model relates to a kind of safety-type pressure oil lift, be that a kind of jacking is set in the process of loaded article specifically, oil hydraulic system can automatically open and close and discharge through-flow mouthful of oil circuit, and carries the pressure oil lift with safety-type Dump valve that can guarantee automatically regulating oil return reduction of speed in the oil return decline at band.

Background technology

Be widely used in the pressure oil lift of every field, its constructional feature is the principle that the utilization hydraulic efficiency pressure system is amplified top lift, reaches the purpose of the weight that hoists effortlessly.Thus, also make the operating oil pressure in the internal oil passages system of such Jack very high, each power element that is configured on the hydraulic circuit very failure-free quality and intensity guarantee have been required, the technical background that this case relates to is an example with the Jack hydraulic unit, only be provided with one on the oil return release oil circuit of its conventional confguration and have the release valve rod of sealing member and the steel ball that there is an oil circuit interruption-forming valve that is communicated with oil cylinder working oil chamber in the system on the head top thereof, connect with screw thread pair between valve rod and the oil cylinder seat and discharge, this screw thread pair is all to adopt common fine thread again, its pitch is little, though positive factor slowly arranged to what realize uninstall process, but the fine thread intensity under the structure space restriction is low, the difficulty of processing height, the oil cylinder seat negative thread that closes with release valve rod external thread rotary is in Casting Parts inside, the latency of its defect in material is quite a few, can small probability ground the oil cylinder high pressure oil occurs and will discharge valve rod and hit and cause the operator's incident of damaging, and, under to the carrying of Jack piston rod part, carry out in the step-down operation, general operation person is difficult to accomplish unclamp lentamente oil return steel ball valve, very likely makes high pressure oil because of crossing described oil return steel ball valve fast---and loaded article shakes to fall to causing Jack inefficacy and harm operator personal safety with anxious the falling of piston rod.

Summary of the invention

The purpose of this utility model is the deficiency at above-mentioned correlation technique scheme, design such scheme: the user of pressure oil lift need not possess skilled operating skill, can be when the oil return that the Jack bringing onto load is descended discharges, more optionally unclamp the oil return valve, oil hydraulic system just can automatically be regulated in advance through-flow mouthful of size built in the safety-type Dump valve valve place of intersecting with oil return circuit with the oil pressure in its oil cylinder working oil chamber, the descending speed of Jack piston rod under the control load pressure strictly, to overcome the defective of prior art, improve and also to guarantee the operability that pressure oil lift steadily descends, and eliminate effectively that tradition discharges valve rod because the prominent valve rod that causes of becoming homeless of screw thread pair intensity hits the personal phenomenon of injury.

Above-mentioned purpose of the present utility model is achieved through the following technical solutions: a kind of pressure oil lift of tool safety-type Dump valve, comprise oil cylinder seat, 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 loop at high pressure oil, be provided with the automatic valve device that intersects with the fuel-displaced oil circuit of high pressure, the high-pressure induct oil circuit of offering in the oil cylinder seat is communicated with the oil cylinder working oil chamber of Jack and the big piston lower impressions of automatic valve device, its valve bucket top is the die cavity extension of the valve bucket die cavity that intersects with the fuel-displaced oil circuit of high pressure, cooperate the die cavity content to receive compression spring at big piston, valve bucket and valve bucket die cavity form little moving sets, big piston forms big moving sets with cooperating die cavity, and respectively little moving sets is provided with little sealing member and big sealing member with big moving sets, be provided with the fixing screw of sealing member below big piston, fixing screw connects oil cylinder seat with screw thread pair.

The beneficial effect that the utility model compared with prior art has is: at the inner automatic valve device that intersects with the fuel-displaced oil circuit of high pressure that is provided with of pressure oil lift, take to realize the size of the through-flow mouth of oil return the autocontrol valve piston die cavity, thereby make in the piston rod process of operator under discharging load steadily slow, safe and reliable from oil cylinder working oil chamber drainage impulse.

Description of drawings

The description of drawings of embodiment:

Figure 1 shows that the block diagram of the utility model embodiment;

Fig. 2 is the front view of the utility model embodiment;

Fig. 3 is relative Fig. 2 " A-A " cutaway view;

Fig. 4 is that relative Fig. 2 has amplified " B-B " part sectional view;

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

1 oil cylinder seat, 2 pump housing parts, 3 pump cores, 4 press hand unit, 5 interlock bearing pins, 6 fulcrum pin axles, 7 outer casing parts, 8 cylinder parts, 9 top cap members, 10 piston rod parts, 11 oil suction lines, 12 press oil circuit, and 13 press oily check valve steel ball, 14 oil sucting one-way valve steel balls, 15 discharge valve rod, 16 pump chambers, 17 oil cylinder working oil chambers, 18 shoe cream rooms, 19 automatic valve devices, 20 high-pressure induct oil circuits, 21 big piston lower impressions, 22 valve buckets, the fuel-displaced oil circuit of 23 high pressure, 24 valve bucket die cavities, 25 die cavity extensions, 26 big pistons, 27 cooperate die cavity, 28 compression springs, 29 little moving sets, 30 big moving sets, 31 little sealing members, 32 big sealing members, 33 fixing screws, 34 sealing members, 35 fuel-return valve steel balls, 36 screw thread pairs, 37 oil return circuits.

The specific embodiment

The utility model 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, embodiment of the present utility model sets up the automatic valve device to the oil return circuit system and a kind of new construction scheme of forming on conventional hydraulic Jack basis, mainly contain its whole composition: respectively with separately screw thread pair connection, with top cap member 9 piston rod part 10, outer casing part 7 are connected firmly on oil cylinder seat 1 between cylinder part 8, pump housing parts 2 and the oil cylinder seat 1; With interlock bearing pin 5 pump core 3 is rotated and connects with pressing hand unit 4, and pump core 3 is inserted pump housing parts 2, form pump chamber 16, will press hand unit 4 with oil cylinder seat 1 enforcement rotation connection with fulcrum pin axle 6; Form shoe cream room 18 in the outer casing part 7; In oil cylinder seat 1, be provided with basic oil suction line 11, oil sucting one-way valve steel ball 14, and be provided with pressure oil circuit 12 and press oily check valve steel ball 13; The high-pressure induct oil circuit of offering in oil cylinder seat 1 20 is communicated with the oil cylinder working oil chamber 17 of Jack and the big piston lower impressions 21 of automatic valve device 19, its valve bucket 22 tops are die cavity extensions 25 of the valve bucket die cavity 24 that intersects with the fuel-displaced oil circuit of high pressure 23, holding compression spring 28 in the die cavity 27 with cooperating of big piston 26, valve bucket 22 forms little moving sets 29 with valve bucket die cavity 24, big piston 26 forms big moving sets 30 with cooperating die cavity 27, and respectively little moving sets 29 is provided with little sealing member 31 and big sealing member 32 with big moving sets 30, be provided with the fixing screw 33 of sealing member 34 below big piston 26, fixing screw 33 connects oil cylinder seat 1 with screw thread pair under it.

The utility model embodiment uses like this: at first screw release valve rod 15 at screw thread pair 36 places---close fuel-return valve steel ball 35, make to press to carry on the hand unit 4 and rotate around fulcrum pin axle 6, make pump core 3 to top offset by interlock bearing pin 5, at this moment, hydraulic oil in the shoe cream room 18 is just through oil suction line 11, oil sucting one-way valve steel ball 14 enters pump chamber 16, after moving to the appropriate location on pump core 3, press down and press hand unit 4, sucked that hydraulic oil in the pump chamber 16 just boosts and approach is pressed oil circuit 12 under the pressure of pump core 3, press oily check valve steel ball 13 to be pressed into oil cylinder working oil chamber 17, pump core 3 so pumps, the high pressure oil of increment just can be constantly extrapolated piston rod part 10 gradually in the oil cylinder working oil chamber 17, thereby promoting loaded article moves, when this load was the maximum setting load of this pressure oil lift, the oil pressure in the oil cylinder working oil chamber 17 reached maxim; Fuel-displaced oil circuit 23 of high pressure and high-pressure induct oil circuit 20 just are passed to the big piston lower impressions 21 of automatic valve device 19 and the upper end surface of valve bucket 22 to the oil pressure in the oil cylinder working oil chamber 17 in time, ignore each moving sets friction drag this moment, and the radius of setting big piston 26 is that the radius of R, valve bucket 22 is that r, the spring force of compression spring 28 in its characteristic line operating range are: F _{Elastic force}, operating oil pressure pressure is p, the downward oil pressure thrust that valve bucket 22 is suffered: P _Valve=П r ²P, the oil pressure thrust that makes progress that big piston 22 is suffered: P _Piston=П R ²P, this moment valve bucket 22 just under the effect of differential force, do differential displacement to its die cavity extension 25, make it and the fuel-displaced oil circuit 23 of high pressure between through-flow mouth reduce until closure substantially, its stress balance formula is: F _{Elastic force}+ П r ²P-П R ²P=0; That is: F _{Elastic force}=П R ²P-П r ²P;

F _{Elastic force}=П (R ²-r ²) p

In the following formula: П (R ²-r ²) be constant term, П is a circular constant, p is an independent variable, F _{Elastic force}Be the function of p, p is big more, F _{Elastic force}Just big more, make the F of compression spring at its characteristic line operation interval _{Elastic force}Become big, the amount of being compressed of this compression spring 28 will be increased, valve bucket 22 reaches the purpose that reduces through-flow mouthful of size just to top offset at this moment.Therefore, oil pressure pressure in the oil cylinder working oil chamber 17 is high more, the load value that just shows 10 jackings of piston rod part is just big more, this because automatic valve device 19 with oil pressure pressure p as the reason that turns down the through-flow mouth in valve bucket 22 tops, and release valve rod 15 pressurizeds are reduced, removed the potential danger that release valve rod 15 is hit by high pressure from, simultaneously, made the process of artificial release high pressure oil become safer steady, reliable.Described releasing operation process is: the operator will discharge valve rod 15 and unscrew, fuel-return valve steel ball 35 just leaves its valve seat, the fuel-displaced oil circuit 23 of high pressure that is communicated with oil cylinder working oil chamber 17 will flow through the oil return circuit 37 that high pressure oil enters straight-through shoe cream room 18 with valve bucket 22 at through-flow mouthful of place of the combination at valve bucket die cavity 24 places, oil pressure at described valve bucket die cavity 24 places is high more, be that load pressure is high more, the passage section that its combination is through-flow mouthful is just more little, high pressure oil mass by this valve port in unit time is just more little, piston rod part 10 is taken the speed that the load of its jacking resets in cylinder part 8 just more little, restorative displacement has so also just obtained effective control naturally, and its safety performance that steadily descends has indicated that the pressure oil lift past does not cause the Jack damage loaded article that descends rapidly because of there being at a slow speed release function, facility and the critical defect that endangers operator's person will well be contained.

Claims

1. the pressure oil lift of a tool safety-type Dump valve, comprise oil cylinder seat, 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 loop at high pressure oil, be provided with the automatic valve device that intersects with the fuel-displaced oil circuit of high pressure, the high-pressure induct oil circuit of offering in the oil cylinder seat (1) (20) is communicated with the oil cylinder working oil chamber (17) of Jack and the big piston lower impressions (21) of automatic valve device (19), its valve bucket (22) top is the die cavity extension (25) of the valve bucket die cavity (24) that intersects with the fuel-displaced oil circuit of high pressure (23), in cooperating die cavity (27), big piston (26) holds compression spring (28), valve bucket (22) forms little moving sets (29) with valve bucket die cavity (24), and big piston (26) forms big moving sets (30) with cooperating die cavity (27).

2. the pressure oil lift of tool safety-type Dump valve according to claim 1, its feature also is: respectively little moving sets (29) and big moving sets (30) are provided with little sealing member (31) and big sealing member (32).

3. the pressure oil lift of tool safety-type Dump valve according to claim 1, its feature also is: be provided with the fixing screw (33) of sealing member (34) in big piston (26) below, fixing screw (33) connects oil cylinder seat (1) with screw thread pair.