CN2908135Y - Four-column type stretching expansion hydraulic press - Google Patents

Four-column type stretching expansion hydraulic press Download PDF

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Publication number
CN2908135Y
CN2908135Y CN 200520145178 CN200520145178U CN2908135Y CN 2908135 Y CN2908135 Y CN 2908135Y CN 200520145178 CN200520145178 CN 200520145178 CN 200520145178 U CN200520145178 U CN 200520145178U CN 2908135 Y CN2908135 Y CN 2908135Y
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CN
China
Prior art keywords
valve
bulging
electro
control
hydraulic press
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Application number
CN 200520145178
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Chinese (zh)
Inventor
陈锐球
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陈锐球
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Priority to CN 200520145178 priority Critical patent/CN2908135Y/en
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Publication of CN2908135Y publication Critical patent/CN2908135Y/en

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Abstract

The utility model discloses a four-column drawing expansion hydraulic press, and the key points are in that the hydraulic press is provided with a control device shifting between the drawing and expansion electrics, the control device consists of a PLC (Programmable Logic Control) for the drawing and expansion electric control and a change-over switch for the drawing and expansion program switching, and when the switch is used for performing the switching, the control is accurate and reliable, the system runs steadily, and the adjustment is convenient. With the structure, the four-column drawing expansion hydraulic press which not only can accomplish the drawing process and but also obtain the expansion process.

Description

Four-column type stretching bulging hydraulic press
Technical field
The utility model relates to a kind of four-column type stretching bulging hydraulic press, and this machine both can be finished drawing process, can finish bulging process again, is a kind of four-column hydraulic press of finishing two kinds of completely different technologies in single device.
Background technology
Utilize stretching die that the punching course that plate blank or open hollow blank strike out container-like part is called stretching.Stretching is one of main Sheet Metal Forming Technology, uses very extensively, all is to use the drawing process moulding as some cover parts, coverings etc. of the hardware in the daily life, casing of domestic electrical equipment inner bag, automobile and motorcycle.The four-column type hydraulic drawing press is present most widely used stretcher, it constitutes shown in Figure 1A and Figure 1B, mainly comprises vat 38, quick cylinder 36, upper beam 67, central sill 68, underbeam 69, operating desk 70, flanging cylinder 33, fuel tank 24, hydraulic system 66, motor oil pump 71, electric control system 73, column 72.Bulging is to produce the protruding distortion of drum on the local location that makes in the middle of metal blank or the blank, thereby obtains a kind of manufacturing process of the part that its surface area increases; Or utilize the pressure hollow parts that diameter is little (generally rolling curved being welded), tubing, sheet material by plate, be expanded to a kind of forming method of the bigger bent bus part of diameter from inside to outside.Erose non-rotary body part is also used the expanding method moulding sometimes.The extensive use in aircraft, instrument, instrument, product for civilian use manufacturing industry such as (for example vacuum cup, vacuum flask, coffee pots etc.) of bulging spare.Bulging is divided into firm mould bulging and soft mode bulging (medium comprises liquid, gas, rubber and polyurethane etc.).Four-column type bulging hydraulic press is present most widely used bulging equipment, it constitutes shown in Fig. 2 A and Fig. 2 B, mainly comprises vat 38, quick cylinder 36, upper beam 67, central sill 68, underbeam 69, operating desk 70, water tank 23, fuel tank 24, pressurized cylinder 12, hydraulic pressure system 611, motor oil pump 71, workbench backing plate 64, water fender 65, column 72, hydraulic system 66, electric control system 73.
Because stretching and bulging process process difference are very big, make so the generally all manufactured factory of stretching and bulging equipment is independent respectively, if will make equipment use producer not only to need stretching but also need bulging equipment like this, must buy these two kinds of equipment, equipment uses the manufacturer production cost to increase like this, and the factory building utilization rate also reduces at double simultaneously.
The utility model content
Must be separate in order to overcome stretching and bulging equipment, cause equipment to use the deficiency of aspects such as manufacturer production cost height, the utility model provides a kind of four-column type stretching bulging hydraulic press, this kind equipment utilizes wherein general character of stretcher and bulging equipment dexterously, on stretching and bulging machine basis, unite two into one, designed and developed a kind of novel device: four-column type stretching bulging hydraulic press.This equipment both can utilize stretching die and can finish stretch forming process with stretching run; Also can utilize bulging die and can finish expansion shape forming technology, reach the dual-use purpose with the bulging program.
To achieve these goals, the technical solution adopted in the utility model is: this four-column type stretching bulging hydraulic press has the control device that stretches, bulging switches between electric, this control device includes and is used to stretch, the Programmable Logic Controller PLC of bulging electrical control, be used to stretch, change-over switch that the bulging program is switched.
In addition, this control device more includes operating desk, is used to stretch, the travel switch of bulging work conversion, relay, reversal valve, and electromagnet; This relay is divided into the time relay and pressure switch, and this reversal valve is divided into solenoid directional control valve and electro-hydraulic reversing valve; And this solenoid directional control valve and electro-hydraulic reversing valve are provided with the control bit that is used to control oil circuit, and this control bit is divided into position, a left side, meta, right position.
The beneficial effect that reaches by the technical solution of the utility model is: can obtain a kind ofly both can finishing drawing process, can finish the novel four-column type stretching bulging hydraulic press of bulging process again.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Description of drawings
Figure 1A is existing four-column type hydraulic drawing press complete machine structure front view;
Figure 1B is existing four-column type hydraulic drawing press complete machine structure left view;
Fig. 2 A is existing four-column type bulging hydraulic press complete machine structure front view;
Fig. 2 B is existing four-column type bulging hydraulic press complete machine structure left view;
Fig. 3 A is the complete machine structure front view of the utility model four-column type stretching bulging hydraulic press;
Fig. 3 B is the complete machine structure left view of the utility model four-column type stretching bulging hydraulic press;
Fig. 4 is the hydraulic schematic diagram of the utility model four-column type stretching bulging hydraulic press.
The specific embodiment
In order to achieve the above object, the utility model embodiment is achieved by the following technical solutions.
Its structure is shown in Fig. 3 A and Fig. 3 B, the utility model four-column type stretching bulging hydraulic press comprises vat 38, quick cylinder 36, put the beams in place 67, central sill 68, underbeam 69, operating desk 70, flanging cylinder 33, fuel tank 24, pressurized cylinder 12, hydraulic system 66, hydraulic pressure system 611, motor oil pump 71, workbench backing plate 64, water fender 65, column 72, and, it focuses on, this four-column type stretching bulging hydraulic press has stretching, the control device that switches between bulging is electric, this control device includes and is used for stretching, the Programmable Logic Controller PLC of bulging electrical control, be used for stretching, the change-over switch that the bulging program is switched, utilize this switch to change, precise control is reliable, system is stable, and is easy to adjust.
In addition, this control device more includes operating desk 70, is used to stretch, the travel switch of bulging work conversion, relay, reversal valve, and electromagnet; This relay is divided into the time relay and pressure switch, and this reversal valve is divided into solenoid directional control valve and electro-hydraulic reversing valve; And this solenoid directional control valve and electro-hydraulic reversing valve are provided with the control bit that is used to control oil circuit, and this control bit is divided into position, a left side, meta, right position.
Its concrete operation principle as shown in Figure 4, the utility model four-column type stretching bulging hydraulic press has two pumps, Variable plunger pump 1 is connected with overflow valve 3, and sets up its maximum working pressures by this overflow valve 3, and with remote pressure regulating valve 5 implementation Long-distance Control.High-pressure gear pump 20 is high-pressure low-flow constant displacement pumps, is connected with overflow valve 21, is used for the moisturizing exhaust, and its pressure is set up by overflow valve 21.During startup, press start button, electromagnet all is in power failure state, big motor 27 starts Variable plunger pump 1 work that is attached thereto that drives, the oil of Variable plunger pump 1 output flows back to fuel tank 24, starting under no load through check valve 9, overflow valve 3 and electro-hydraulic reversing valve 48, electro-hydraulic reversing valve 28, electro-hydraulic reversing valve 8 metas, cooler 7.
When the utility model four-column type stretching bulging hydraulic press carries out semi-automatic stretching work, operate by the change-over switch of being located on the operating desk 70, and utilize electric control system to start stretching run, begin to carry out semi-automatic stretching work.System realizes that the operation principle of semi-automatic stretching working cycles and step are as follows:
1. vat is descending fast: press change-over switch, electromagnet YA1, electromagnet YA8 get electric, and solenoid directional control valve 6 and electro-hydraulic reversing valve 48 change to right position, and control oil opens hydraulic control one-way valve 39 through electro-hydraulic reversing valve 48 right positions.This moment, the fluid mobility status was:
In-line: oil suction oil filter 2 → Variable plunger pump 1 → check valve 9 → electro-hydraulic reversing valve 48 right positions → quick cylinder 36 epicoeles.
Oil return line: quick cylinder 36 cavity of resorptions → hydraulic control one-way valve 39 → balanced valve 40 → electro-hydraulic reversing valve 48 right position → electro-hydraulic reversing valve 28 metas → electro-hydraulic reversing valve 8 metas → cooler 7 → fuel tanks 24.
When work, it is descending rapidly that vat 38 drives central sill 68, though Variable plunger pump 1 is in the maximum stream flow state, can not satisfy its needs, thereby vat 38 epicoeles formation negative pressure, and the fluid of topping up case 41 enters vat 38 epicoeles through prefill valve 42.
2. vat changes pattern at a slow speed, pressurization: after vat 38 drive central sills 68 come downwards to certain position shake-up travel switch 50, electromagnet YA11 gets electric, and at this moment the pressure oil that comes out of Variable plunger pump 1 is divided into two-way, cylinder 36 epicoeles of a route Variable plunger pump 1 → electro-hydraulic reversing valve 48 right positions → fast; Another route Variable plunger pump 1 → electro-hydraulic reversing valve 48 right position → electro-hydraulic reversing valve 46 left side position → check valve 45 → vat 38 epicoeles.Like this, vat 38 upper cavity pressures raise, and prefill valve 42 cuts out, the slack-off pattern of vat 38 downstream rates.After vat 38 drove central sill 68 patterns, resistance increased sharply, and vat 38 upper cavity pressures further improve, when vat 38 upper cavity pressures are increased to a certain value, and Variable plunger pump 1 beginning variable, output flow reduces, thereby vat 38 speed further reduce.
Meanwhile, after vat 38 drove central sills 68 patterns, because the piston of flanging cylinder 33 has risen to certain position in the beginning of working cycles, the cavity of resorption of flanging cylinder 33 can form certain pressure, can drive central sills 68 with vat 38 again and press down and descend.At this moment, electro-hydraulic reversing valve 28 is in meta, and the piston of flanging cylinder 33 was descending thereupon when vat 38 drive central sills 68 pressed down, and flanging cylinder 33 cavity of resorption fluid flow back to fuel tank 24 through overflow valve 29, make the cavity of resorption of flanging cylinder 33 keep required pressure-pad-force.Regulate remote pressure regulating valve 30 and can change unsteady pressure-pad-force.Flanging cylinder 33 epicoeles then through check valve 32 from fuel tank 24 repairings.
3. pressure release, vat backhaul material returned cylinder ejects, the time-delay of flanging cylinder is up: when vat 38 upper cavity pressures reach predetermined value, pressure switch 44 sends signal, make electromagnet YA8, electromagnet YA1, electromagnet YA11 dead electricity, electromagnet YA7, electromagnet YA2, electromagnet YA12, electromagnet YA10, electromagnet YA14 gets, electro-hydraulic reversing valve 48, solenoid directional control valve 6 changes to position, a left side, electro-hydraulic reversing valve 46 changes to meta, solenoid directional control valve 35, solenoid directional control valve 54 changes to right position, prefill valve 42 is opened, vat 38 low pressure backhaul material returned cylinders 37 eject after the vat 38 epicoele pressure releases, and maximum pressure is set up by remote pressure regulating valve 5; Make time relay time-delay send signal simultaneously, electromagnet YA5 gets electric, and electro-hydraulic reversing valve 28 changes to position, a left side, and flanging cylinder 33 is up.Overflow valve 53 is quick cylinder 36 cavity of resorption safety valves.This moment, the fluid mobility status was:
Quick cylinder 36 cavity of resorption in-lines: oil suction oil filter 2 → Variable plunger pump 1 → check valve 9 → electro-hydraulic reversing valve 48 left side position → balanced valve 40 → hydraulic control one-way valves 39 → quick cylinder 36 cavity of resorptions.
Vat 38 epicoele oil return lines: vat 38 epicoeles → prefill valve 42 → topping up case 41.
Flanging cylinder 33 cavity of resorption in-lines: quick cylinder 36 epicoeles → electro-hydraulic reversing valve 48 left side position → electro-hydraulic reversing valves 28 left side position → flanging cylinders 33 cavity of resorptions.
Flanging cylinder 33 epicoele oil return lines: flanging cylinder 33 epicoeles → electro-hydraulic reversing valve 28 left side position → electro-hydraulic reversing valve 8 metas → cooler 7 → fuel tanks 24.
Material returned cylinder 37 epicoele in-lines: oil suction oil filter 2 → Variable plunger pump 1 → check valve 9 → solenoid directional control valve 35 right position → material returned cylinder 37 epicoeles.
Material returned cylinder 37 cavity of resorption oil return lines: material returned cylinder 37 cavity of resorptions → solenoid directional control valve 35 right position → fuel tanks 24.
4. material returned cylinder ejects to put in place and stops, and the vat backhaul puts in place and stops: when vat 38 drive central sills 68 go upward to shake-up travel switch 51, and electromagnet YA10 dead electricity, solenoid directional control valve 35 changes to meta, and material returned cylinder 37 ejects to put in place and stops.When vat 38 drive central sills 68 go upward to shake-up travel switch 49, electromagnet YA7, electromagnet YA14 dead electricity, solenoid directional control valve 54 changes to the normality position, and electro-hydraulic reversing valve 48 changes to meta, and vat 38 backhauls put in place and stop.This moment, the fluid mobility status was:
Flanging cylinder 33 cavity of resorption in-lines: oil suction oil filter 2 → Variable plunger pump 1 → check valve 9 → electro-hydraulic reversing valve 48 metas → electro-hydraulic reversing valve 28 left side position → flanging cylinders 33 cavity of resorptions.
Flanging cylinder 33 epicoele oil return lines: flanging cylinder 33 epicoeles → electro-hydraulic reversing valve 28 left side position → electro-hydraulic reversing valve 8 metas → cooler 7 → fuel tanks 24.
5. up the putting in place of flanging cylinder stopped: when flanging cylinder 33 goes upward to shake-up travel switch 34, and electromagnet YA5, electromagnet YA2 dead electricity, electro-hydraulic reversing valve 28 changes to meta, and flanging cylinder 33 up putting in place are stopped.This moment, the fluid mobility status was:
Oil suction oil filter 2 → Variable plunger pump 1 → overflow valve 3 → cooler 7 → fuel tank 24.Variable plunger pump 1 unloading.
When the utility model four-column type stretching bulging hydraulic press carries out the work of semi-automatic bulging, operate by the change-over switch of being located on the operating desk 70, and utilize electric control system to start the bulging program, begin to carry out semi-automatic bulging work.System realizes that the operation principle of semi-automatic bulging working cycles and step are as follows:
1. vat is descending fast: press change-over switch, electromagnet YA1, electromagnet YA8 get electric, and solenoid directional control valve 6 and electro-hydraulic reversing valve 48 change to right position, and control oil opens hydraulic control one-way valve 39 through electro-hydraulic reversing valve 48 right positions.This moment, the fluid mobility status was:
In-line: oil suction oil filter 2 → Variable plunger pump 1 → check valve 9 → electro-hydraulic reversing valve 48 right positions → quick cylinder 36 epicoeles.
Oil return line: quick cylinder 36 cavity of resorptions → hydraulic control one-way valve 39 → balanced valve 40 → electro-hydraulic reversing valve 48 right position → electro-hydraulic reversing valve 28 metas → electro-hydraulic reversing valve 8 metas → cooler 7 → fuel tanks 24.
It is descending rapidly that vat 38 drives central sill 68, though Variable plunger pump 1 is in the maximum stream flow state, can not satisfy its needs, thereby vat 38 epicoeles formation negative pressure, and the fluid of topping up case 41 enters vat 38 epicoeles through prefill valve 42.
2. vat changes at a slow speed pattern, pressurize locked mode, pressurized cylinder and ejects one section after vat 38 drives central sills 68 and comes downwards to certain position and touch travel switch 50, electromagnet YA11 gets, at this moment the pressure oil that comes out of Variable plunger pump 1 is divided into two-way, cylinder 36 epicoeles of a route Variable plunger pump 1 → electro-hydraulic reversing valve 48 right positions → fast; Another route Variable plunger pump 1 → electro-hydraulic reversing valve 48 right position → electro-hydraulic reversing valve 46 left side position → check valve 45 → vat 38 epicoeles.Like this, vat 38 upper cavity pressures raise, and prefill valve 42 cuts out, the slack-off pattern of vat 38 downstream rates.
After vat 38 drives central sill 68 patterns, resistance increases sharply, vat 38 upper cavity pressures further improve, when vat 38 upper cavity pressures reach predetermined value, pressure switch 44 sends signal, make electromagnet YA8, electromagnet YA11 dead electricity, electro-hydraulic reversing valve 48, electro-hydraulic reversing valve 46 change to meta, the sealing of vat 38 epicoeles, the spool conical surface of check valve 45, Solenoid ball valve 47 and prefill valve 42 has guaranteed vat 38 epicoele good sealing property, make vat 38 epicoele pressurizes, mould pins with being stabilized, the time relay adjustment that the dwell time is controlled by pressure switch 44; It is electric that electromagnet YA4 is got, and electro-hydraulic reversing valve 8 changes to right position, and pressurized cylinder 12 ejects.This moment, the fluid mobility status was:
Pressurized cylinder 12 left chamber in-lines: oil suction oil filter 2 → Variable plunger pump 1 → check valve 9 → electro-hydraulic reversing valve 48 metas → electro-hydraulic reversing valve 8 right position → pressurized cylinders 12 left chambeies.
Pressurized cylinder 12 right chamber oil return lines: pressurized cylinder 12 right chamber → electro-hydraulic reversing valve 8 right position → cooler 7 → fuel tanks 24.
3. water charging system moisturizing, exhaust: after the collision block of pressurized cylinder 12 drives walks to certain position shake-up travel switch 14, electromagnet YA4, electromagnet YA1 dead electricity, electro-hydraulic reversing valve 8 changes to meta, Variable plunger pump 1 unloading.Small machine 26 starts, gear pump 20 work, and emulsion is through oil suction oil filter 22 → gear pump 20 → high pressure check valve 16 → to pressurized cylinder 12 water cavities and mold cavity 25 in the water tank 23.Electromagnet YA13 gets electric, and emulsion discharges mold cavity 25 gases through oil suction oil filter 22 → gear pump 20 → open air bleeding valve 15 to the right position of solenoid directional control valve 17.
4. moisturizing is to pressing, pressurized cylinder supercharging: when pressurized cylinder 12 water cavity pressure reach predetermined value, pressure switch 18 sends signal, make electromagnet YA13 dead electricity, electromagnet YA4, YA1 get electric, and solenoid directional control valve 17 changes to the normality position, electro-hydraulic reversing valve 8, solenoid directional control valve 6 change to position, a left side, motor 26 stops, and high-pressure gear pump 20 quits work, and pressurized cylinder 12 ejects supercharging.This moment, the fluid mobility status was:
Pressurized cylinder 12 left chamber in-lines: oil suction oil filter 2 → Variable plunger pump 1 → check valve 9 → electro-hydraulic reversing valve 48 metas → electro-hydraulic reversing valve 8 right position → pressurized cylinders 12 left chambeies.
Pressurized cylinder 12 right chamber oil return lines: pressurized cylinder 12 right chamber → electro-hydraulic reversing valve 8 right position → cooler 7 → fuel tanks 24.
5. pressurized cylinder is pressurized to and pushes back journey, vat time-delay pressure release backhaul: when pressurized cylinder 12 left cavity pressures reach predetermined value, pressure switch 10 sends signal, make electromagnet YA1, electromagnet YA4 dead electricity, electromagnet YA2, electromagnet YA3 get, solenoid directional control valve 6, electro-hydraulic reversing valve 8 change to position, a left side, pressurized cylinder 12 backhauls.The time relay picks up counting simultaneously.This moment, the fluid mobility status was:
Pressurized cylinder 12 right chamber in-lines: oil suction oil filter 2 → Variable plunger pump 1 → check valve 9 → electro-hydraulic reversing valve 48 metas → electro-hydraulic reversing valve 8 right position → pressurized cylinders 12 right chambeies.
Pressurized cylinder 12 left chamber oil return lines: pressurized cylinder 12 left chamber → electro-hydraulic reversing valve 8 left side position → cooler 7 → fuel tanks 24.
Time relay timing finishes to send signal, and it is electric that electromagnet YA12 is got earlier, vat 38 pressure releases; It is electric that electromagnet YA7, electromagnet YA14 are got, and electro-hydraulic reversing valve 48 changes to position, a left side, and solenoid directional control valve 54 changes to right position, and prefill valve 42 is opened, vat 38 low pressure backhauls after the vat 38 epicoele pressure releases.Maximum pressure is set up by remote pressure regulating valve 5.Overflow valve 53 is quick cylinder 36 cavity of resorption safety valves.This moment, the fluid mobility status was:
Quick cylinder 36 cavity of resorption in-lines: oil suction oil filter 2 → Variable plunger pump 1 → check valve 9 → electro-hydraulic reversing valve 48 left side position → balanced valve 40 → hydraulic control one-way valves 39 → quick cylinder 36 cavity of resorptions.
Vat 38 epicoele oil return lines: vat 38 epicoeles → prefill valve 42 → topping up case 41.
Pressurized cylinder 12 right chamber in-lines: quick cylinder 36 epicoeles → electro-hydraulic reversing valve 48 left side position → electro-hydraulic reversing valve 28 metas → position → pressurized cylinders 12 right chambeies, electro-hydraulic reversing valve 8 left side.
Pressurized cylinder 12 left chamber oil return lines: pressurized cylinder 12 left chamber → electro-hydraulic reversing valve 8 left side position → cooler 7 → fuel tanks 24.
6. the pressurized cylinder backhaul puts in place, the vat backhaul puts in place and stop: after collision block that pressurized cylinder 12 drives walks to certain position and touches travel switch 13, and electromagnet YA3 dead electricity, electro-hydraulic reversing valve 8 changes to meta, and pressurized cylinder 12 backhauls put in place and stop.When vat 38 drive central sills 68 go upward to shake-up travel switch 49, electromagnet YA7, electromagnet YA14 dead electricity, solenoid directional control valve 54 changes to the normality position, and electro-hydraulic reversing valve 48 changes to meta, and vat 38 backhauls put in place and stop.This moment, the fluid mobility status was:
Oil suction oil filter 2 → Variable plunger pump 1 → overflow valve 3 → cooler 7 → fuel tank 24.Variable plunger pump 1 unloading.
By above-mentioned principle, and utilize the structure of the utility model four-column type stretching bulging hydraulic press,, can stretch on demand or the bulging operation, reach the purpose of dual-use by control device.
In sum, the utility model from application target, on the usefulness, viewpoint such as progressive and novelty sets forth, the practical improvement that it has, function enhancement and practical important document that novel Patent Law is emphasized have been met, shown in the implementation and accompanying drawing that the utility model is above, be one of the utility model preferred embodiment, be not to limit to the utility model with this, be with, such as with approximate, identical person such as structure of the present utility model, device, feature, all should belong to of the present utility model founding within purpose and the claim.

Claims (7)

1, a kind of four-column type stretching bulging hydraulic press is characterized in that:
This hydraulic press has the control device that stretches, bulging switches between electric, this control device includes and is used to stretch, the Programmable Logic Controller PLC of bulging electrical control, be used to stretch, change-over switch that the bulging program is switched.
2, four-column type stretching bulging hydraulic press as claimed in claim 1 is characterized in that: this control device more includes operating desk, be used to stretch, the travel switch of bulging work conversion, relay, reversal valve, and electromagnet.
3, four-column type stretching bulging hydraulic press as claimed in claim 2, it is characterized in that: this relay is the time relay and pressure switch.
4, four-column type stretching bulging hydraulic press as claimed in claim 2, it is characterized in that: this reversal valve is solenoid directional control valve and electro-hydraulic reversing valve.
5, four-column type stretching bulging hydraulic press as claimed in claim 4, it is characterized in that: this solenoid directional control valve and this electro-hydraulic reversing valve are provided with the control bit that is used to control oil circuit.
6, four-column type stretching bulging hydraulic press as claimed in claim 5 is characterized in that: the control bit of this solenoid directional control valve is position, a left side, meta, right position.
7, four-column type stretching bulging hydraulic press as claimed in claim 5 is characterized in that: the control bit of this electro-hydraulic reversing valve is position, a left side, meta, right position.
CN 200520145178 2005-12-21 2005-12-21 Four-column type stretching expansion hydraulic press CN2908135Y (en)

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Application Number Priority Date Filing Date Title
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101927578A (en) * 2010-08-24 2010-12-29 东莞市得力仕机械科技有限公司 Servo electrohydraulic composite pressure method and press machine thereof
CN102039691A (en) * 2010-12-28 2011-05-04 平顶山市通运矿山机械厂 PLC control system for pulverized coal hydraulic forming machine
CN105034443A (en) * 2015-08-14 2015-11-11 中山市八达机器制造有限公司 Pressure maintaining and pressure unloading stabilization ultralow speed oil press
CN105216360A (en) * 2015-10-19 2016-01-06 上海理工大学 Miniature double action hydraulic press and manufacturing process
CN106799419A (en) * 2017-01-18 2017-06-06 浙江倪氏徽章有限公司 A kind of full-automatic pressing equipment
CN108312606A (en) * 2018-02-06 2018-07-24 江苏铭格锻压设备有限公司 A kind of four-column hydraulic press
CN108327351A (en) * 2018-02-06 2018-07-27 江苏铭格锻压设备有限公司 A kind of boost fluid press

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101927578A (en) * 2010-08-24 2010-12-29 东莞市得力仕机械科技有限公司 Servo electrohydraulic composite pressure method and press machine thereof
CN102039691A (en) * 2010-12-28 2011-05-04 平顶山市通运矿山机械厂 PLC control system for pulverized coal hydraulic forming machine
CN105034443A (en) * 2015-08-14 2015-11-11 中山市八达机器制造有限公司 Pressure maintaining and pressure unloading stabilization ultralow speed oil press
CN105216360A (en) * 2015-10-19 2016-01-06 上海理工大学 Miniature double action hydraulic press and manufacturing process
CN106799419A (en) * 2017-01-18 2017-06-06 浙江倪氏徽章有限公司 A kind of full-automatic pressing equipment
CN108312606A (en) * 2018-02-06 2018-07-24 江苏铭格锻压设备有限公司 A kind of four-column hydraulic press
CN108327351A (en) * 2018-02-06 2018-07-27 江苏铭格锻压设备有限公司 A kind of boost fluid press

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