CN205715005U - Hydraulic system and include the equipment of this hydraulic system - Google Patents
Hydraulic system and include the equipment of this hydraulic system Download PDFInfo
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- CN205715005U CN205715005U CN201620257830.7U CN201620257830U CN205715005U CN 205715005 U CN205715005 U CN 205715005U CN 201620257830 U CN201620257830 U CN 201620257830U CN 205715005 U CN205715005 U CN 205715005U
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Abstract
Disclose a kind of hydraulic system (21), including: hydraulic cylinder (22), it is suitable to receive extraneous pressure and include the first chamber and the second chamber kept apart by piston；And the main control valve (23) of the first chamber hydraulic connecting with hydraulic cylinder, it is configured to the duty being suitable to control hydraulic cylinder；Wherein, described hydraulic system also includes the high-voltage power supply being suitable to export of a relatively high operating pressure and is suitable to export the low pressure source of relatively low operating pressure, described high-voltage power supply is hydraulically connected to main control valve and is suitable to make hydraulic cylinder works when carrying extraneous pressure by main control valve, described low pressure source is hydraulically connected to main control valve and hydraulic cylinder and is suitable to control the duty of hydraulic cylinder self when without extraneous pressure effect, and described high-voltage power supply is kept apart by hydraulic isolation device with described low pressure source.Also disclose a kind of equipment including this hydraulic system.This hydraulic system not only has low cost, but also has high efficiency.
Description
Technical field
This utility model relates to a kind of hydraulic system and a kind of equipment including this hydraulic system.
Background technology
At present, in industrial product forming process, press is widely used, being desired shape by squeezing action by Workpiece shaping.Press generally includes mold and lower mold.In operation, it is common that mold moves towards lower mold, in order to by extruded for desired shape for the workpiece to be processed that is placed in lower mold under the common effect of upper and lower mould.
In order to make that press is reliable, stable, correctly work, it is typically provided with the hydraulic system supporting lower mold.Therefore, press generally includes punching unit and hydraulic system.On the one hand this hydraulic system can ensure that press produces desired extruding force, and the feature of the most available hydraulic system makes press work in an advantageous manner, such as, can alleviate impact shock.
Fig. 1 show of the prior art a kind of typical and punching unit with the use of the hydraulic diagram of hydraulic system 1.This hydraulic system 1 specifically includes that hydraulic cylinder 2, main control valve 3, pump unit the 4, first accumulator the 5, second accumulator the 6, the 3rd accumulator 7, air relief valve 8, fuel tank 9, isolating valve 10 and check valve 12, and the connected mode between these parts is as shown in Figure 1.
The work process of hydraulic system 1 is generally as follows:
1) original state: the piston rod 11 of hydraulic cylinder 2 is maintained at Desired Height.
2) passive exercise state: punching unit extruded during, punching unit makes mold move downward, with extruding be positioned at piston rod 11 top end lower mold on workpiece to be processed.Now, the piston rod 11 of hydraulic cylinder 2 can move down passively, and the hydraulic medium in chamber below piston is passed through main control valve 3 by piston press, thus controls the pressure between mold and lower mold.
3) pressure hold state: when extruded operation reaches desired state, near punching unit generally also needs to upper and lower mould and workpiece to be held in a predetermined position with a certain pressure.This pressure keeps operation to control to realize from the hydraulic medium of pump unit 4 and/or the second accumulator 6 to the flow behavior of fuel tank 9 by main control valve 3.
4) actively high speed return state: after punching unit completes extruded operation, pump unit 4 and/or the second accumulator 6 make piston rod 11 return at Desired Height, in order to ready for extruded process next time.
Between original state and passive exercise state, the hydraulic medium through air relief valve 8 decompression can also be made as required to flow to the chamber above piston a segment distance so that piston rod 11 is retracted in advance and be follow-up extruded ready.
In order to ensure pump unit 4 can individually, timesharing to the upper and lower chamber feed hydraulic medium of piston, need to arrange isolating valve 10.
As seen from the above description, in active high speed return state, needing the hydraulic flow that provided by pump unit 4 and volume apparently higher than the hydraulic flow needed for pressure hold state and volume, but required pressure is significantly less than the pressure needed for pressure hold state.But, in this hydraulic system, hydraulic cylinder is driven by single pump unit 4, and this needs pump unit 4 to have high flow and high pressure fan-out capability simultaneously.Specifically, the maximum pressure that pump unit 4 should provide is determined by maximum pressure required in pressure hold state, and the maximum stream flow that should provide is determined by maximum stream flow required in active high speed return state.This can make hydraulic system must have large scale and the pump of high rated pressure and Accumulator arrangements.At pressure hold state, pump unit needs to provide high pressure, but needs again by reducing discharge capacity or speed with low discharge work simultaneously.In high speed return state, pump unit is with full displacement operation, and to provide high flow, but pressure needs again the setting by regulation pump unit 4 or air relief valve 8 to reduce.
In other words, in traditional hydraulic system, although high pressure and high flow are timesharing demands, but pump unit but must simultaneously meet the two demand.This can make hydraulic system have high cost (not only pump unit, and all relevant fluid pressure lines, valve etc. all should meet the requirement of high pressure and high flow capacity), but also hydraulic system can be made to have low efficiency.
Therefore, in the urgent need to improving current hydraulic system, so that whole hydraulic system has low cost, work highly efficient and energy-conservation simultaneously.
Utility model content
The purpose of this utility model is to provide a kind of has high energy utilization efficiency and the hydraulic system of low cost and a kind of corresponding equipment.
According to first aspect of the present utility model, it is provided that a kind of hydraulic system, including: hydraulic cylinder, it is suitable to receive extraneous pressure and include the first chamber and the second chamber kept apart by piston；And the main control valve of the first chamber hydraulic connecting with described hydraulic cylinder, described main control valve is configured to the duty being suitable to control hydraulic cylinder；It is characterized in that: described hydraulic system also includes the high-voltage power supply being suitable to export of a relatively high operating pressure and is suitable to export the low pressure source of relatively low operating pressure, wherein, described high-voltage power supply is hydraulically connected to main control valve and is suitable to make hydraulic cylinder works when carrying extraneous pressure by main control valve, described low pressure source is hydraulically connected to main control valve and hydraulic cylinder and is suitable to control the duty of hydraulic cylinder self when without extraneous pressure effect, and described high-voltage power supply is kept apart by hydraulic isolation device with described low pressure source.
According to an optional embodiment, described high-voltage power supply includes the first pump unit and at least one high-voltage power supply accumulator；And/or described low pressure source includes the second pump unit and at least one low pressure source accumulator.
According to an optional embodiment, the metered flow of described first pump unit is less than the metered flow of described second pump unit.
According to an optional embodiment, described first pump unit and the second pump unit share a driving motor；And/or described main control valve is proportioning valve.
According to an optional embodiment, described hydraulic isolation device includes multiple isolating valve, the plurality of isolating valve to be configured to be suitable to by control corresponding fluid pressure line switching on and off the hydraulic isolation realized between described high-voltage power supply and low pressure source；And/or described at least one low pressure source accumulator includes the first low pressure source accumulator and the second low pressure source accumulator.
According to an optional embodiment, the plurality of isolating valve includes the first isolating valve, the second isolating valve, the 3rd isolating valve and the 4th isolating valve, wherein, described first pump unit is hydraulically connected to described high-voltage power supply accumulator and the second isolating valve by the first isolating valve, described second isolating valve is hydraulically connected to described main control valve, and the second pump unit is hydraulically connected to main control valve by the 3rd isolating valve and is hydraulically connected to the second chamber of hydraulic cylinder by the 4th isolating valve；And/or described first low pressure source accumulator hydraulic connecting is between the second pump unit and the 3rd isolating valve and between the second pump unit and the 4th isolating valve, the second low pressure source accumulator hydraulic connecting is between the 4th isolating valve and the second chamber of hydraulic cylinder.
According to an optional embodiment, described first isolating valve, the second isolating valve, the 3rd isolating valve and the 4th isolating valve select from check valve, guiding valve, cartridge valve, logical valve；And/or described hydraulic cylinder includes that piston rod, described piston rod are suitable to receive extraneous pressure；And/or described hydraulic system includes multiple hydraulic cylinder groups of being suitable to independently operate, the plurality of hydraulic cylinder group is connected in parallel to described high-voltage power supply and low pressure source, wherein, each hydraulic cylinder group at least includes a described hydraulic cylinder, described main control valve, described second isolating valve, at least one high-voltage power supply accumulator described and described second low pressure source accumulator.
According to an optional embodiment, described hydraulic system applies to the hydraulic system of press, wherein, described hydraulic cylinder is suitable to receive the extruded active force of the punching unit of press, described high-voltage power supply is suitable to make hydraulic cylinder works when keeping described extruded active force during extruded, and described low pressure source is suitable to control the duty of hydraulic cylinder self when acting on hydraulic cylinder without extruded active force.
According to second aspect of the present utility model, it is provided that a kind of equipment operationally producing extruding action, it is characterised in that described equipment is equipped with described hydraulic system, and described hydraulic system is suitable to control the execution of described extruding action.
According to an optional embodiment, described equipment is press, described press includes punching unit, described punching unit have the lower mold being arranged on described hydraulic cylinder and with described lower mold with the use of mold, described mold is suitable to move downward with the extruded workpiece to be processed being positioned in described lower mold.
By arranging the low pressure source and high-voltage power supply that can be isolated from each other, low pressure source or high-voltage power supply can be made as required to perform corresponding function, such that it is able to more advantageously separately design low pressure source and high-voltage power supply, this not only saves cost, but also improves efficiency.
Accompanying drawing explanation
Below, by being more fully described this utility model referring to accompanying drawing, of the present utility model principle, feature and advantage be may be better understood.Accompanying drawing includes:
Fig. 1 show of the prior art a kind of typical and punching unit with the use of the hydraulic diagram of hydraulic system.
Fig. 2 show according to an exemplary embodiment of the present utility model with punching unit with the use of the hydraulic diagram of hydraulic system.
Fig. 3 shows the hydraulic diagram of the passive exercise state of the hydraulic system shown in Fig. 2.
Fig. 4 shows the hydraulic diagram of the pressure hold state of the hydraulic system shown in Fig. 2.
Fig. 5 shows the hydraulic diagram of the active high speed return state of the hydraulic system shown in Fig. 2.
Fig. 6 shows the hydraulic diagram of the active retracted mode in advance of the hydraulic system shown in Fig. 2.
Detailed description of the invention
Below, embodiments more of the present utility model will be more fully described referring to accompanying drawing, in order to be more fully understood that basic thought of the present utility model.
Fig. 2 show according to an exemplary embodiment of the present utility model with punching unit with the use of the hydraulic diagram of hydraulic system 21.
As in figure 2 it is shown, this hydraulic system 21 specifically includes that hydraulic cylinder 22, main control valve the 23, first pump unit the 24, second pump unit 25, multiple isolating valve, multiple accumulator, fuel tank 26 and check valve 28.First pump unit 24 and the second pump unit 25 are the pump unit worked alone.The plurality of isolating valve is preferably specially or includes first isolating valve the 30, second isolating valve the 31, the 3rd isolating valve the 32, the 4th isolating valve 33.The plurality of accumulator is preferably specially or includes first accumulator the 40, second accumulator the 41, the 3rd accumulator 42.
Described main control valve 23 is preferably proportioning valve.
Compared with traditional hydraulic system, this utility model have employed two independent pump units, and wherein, the first pump unit 24 has of a relatively high specified output pressure, and the second pump unit 25 has relatively low specified output pressure.Here, it is pointed out that the output pressure of the first pump unit 24 and the second pump unit 25 be relative to each other for, i.e. first pump unit 24 output operating pressure more than second pump unit 25 output operating pressure.First pump unit 24 and the second pump unit 25 specifically use great operating pressure depending on real needs.
First isolating valve the 30, second isolating valve the 31, the 3rd isolating valve 32 and the 4th isolating valve 33 control switching on and off of the corresponding fluid pressure line of logic control according to predetermined, with the isolation realized between high pressure and low pressure with guarantee that hydraulic system works in the correct way.
As in figure 2 it is shown, the first accumulator 40 and the first pump unit 24 constitute high-voltage power supply, the second accumulator 41 and the second pump unit 25 constitute low pressure source.First pump unit 24 is mainly used in providing high output pressure, such that it is able to have relatively small discharge capacity.Second pump unit 25 is mainly used in providing of a relatively high discharge capacity, such that it is able to have low output pressure.Therefore, all parts relevant to high-voltage power supply can mainly select according to pressure demand, less demanding to flow, and all parts relevant to low pressure source can be mainly according to traffic requirement selection, less demanding to output pressure.
According to a preferred exemplary embodiment, the first pump unit 24 and the second pump unit 25 can share a motor, this is because they are time-sharing operations.
As shown in Figure 2, first pump unit 24 is hydraulically connected to the second isolating valve 31 by the first isolating valve 30, second isolating valve 31 is hydraulically connected to again the first port 43 of main control valve 23, and the first accumulator 40 is hydraulically connected to the fluid pressure line between the first isolating valve 30 and the second isolating valve 31.And, the second pump unit 25 is hydraulically connected to the first port 43 of main control valve 23 by the 3rd isolating valve 32, simultaneously it is also preferred that the second pump unit 25 is hydraulically connected to the upper chamber 44 of hydraulic cylinder 22 the most in parallel by the 4th isolating valve 33.
Preferably, the second accumulator 41 and the fluid pressure line hydraulic connecting between the second pump unit 25 and the three, the 4th isolating valves 32,33.3rd accumulator 42 and the fluid pressure line hydraulic connecting between upper chamber 44 and the 4th isolating valve 33 of hydraulic cylinder 22.
As traditional hydraulic system, the lower chambers 45 of hydraulic cylinder 22 is connected with the second port 46 of main control valve 23, and the 3rd port 47 of main control valve 23 leads to fuel tank 26.
First isolating valve 30 can be with preferably unidirectional valve, in order to only allow the first pump unit 24 outwards to export high-pressure fluid medium.Second isolating valve 31 is for controlling when the first accumulator 40 supplies high-pressure fluid medium to main control valve 23.
3rd isolating valve 32 is for controlling when the second pump unit 25 and/or the second accumulator 41 supply low-pressure fluid medium to main control valve 23.4th isolating valve 33 is for controlling when the second accumulator 41 and/or the second pump unit 25 supply low-pressure fluid medium to the upper chamber 44 of hydraulic cylinder 22.
Below, will be described in the work process of this hydraulic system 21.
In original state, the piston rod 27 of hydraulic cylinder 22 is maintained at Desired Height.Then, in order to perform the extruded passive exercise state being operated into shown in Fig. 3.In the passive exercise state shown in Fig. 3, piston rod 27 moves down due to mold extruding lower mold, and the hydraulic medium in the lower chambers 45 of hydraulic cylinder 22 can be flowed to fuel tank 26, by piston press as shown in the arrow 48 and 49 in Fig. 3 by after main control valve 23.By the control action of main control valve 23, the size of extruding force, extrusion speed and extruding acceleration etc. can be controlled.Now, the second isolating valve 31 and the 3rd isolating valve 32 are closed.Due to the expansion of volume of the upper chamber 44 of hydraulic cylinder 22, hydraulic medium can reflux to the upper chamber 44 of hydraulic cylinder 22 as shown in arrow 50 and 51 from the second accumulator 41 and/or the 3rd accumulator 42.
When extruded operation reaches desired state, hydraulic system 21 enters into the pressure hold state shown in Fig. 4.As shown in Figure 4, first isolating valve 30 and the second isolating valve 31 are opened, by the first pump unit 24 and/or the first accumulator 40 to main control valve 23 conveying high-pressure fluid media (medium), as shown in the arrow 52 and 53 in Fig. 4, main control valve 23 transforms to another duty relative to the duty shown in Fig. 3 simultaneously, to realize pressure holding operation.Now, the 3rd isolating valve 32 cuts out, to keep apart high-voltage power supply and low pressure source.
At pressure hold state, the 4th isolating valve 33 is preferably made to open, in order to allow hydraulic medium to flow between the second accumulator 41 and the upper chamber 44 of hydraulic cylinder 22 due to pressure oscillation, as shown in the arrow 54 in Fig. 4 under pressure hold state.Certainly, hydraulic medium also can flow between the 3rd accumulator 42 and the upper chamber 44 of hydraulic cylinder 22, as shown in arrow 55.If the 4th isolating valve 33 cuts out, hydraulic medium only can flow between the 3rd accumulator 42 and the upper chamber 44 of hydraulic cylinder 22 as shown in arrow 55ly.Now, pressure hold state as shown in arrow 56 can also be produced between lower chambers 45 and the main control valve 23 of hydraulic cylinder 22.
After punching unit completes extruded operation, hydraulic system 21 enters into actively high speed return state.Generally, when punching unit completes extruded operation and is lifted away from, piston rod 27 needs to move up return, now enters into the active high speed return state shown in Fig. 5.In the active high speed return state shown in Fig. 5, the second isolating valve 31 cuts out, to keep apart high-voltage power supply and low pressure source.Simultaneously, 3rd isolating valve 32 is opened, to allow the second pump unit 25 and/or the second accumulator 41 to carry low pressure, the fluid media (medium) of big flow to main control valve 23, now main control valve 23 is switched to the lower chambers 45 allowing fluid media (medium) to flow to hydraulic cylinder 22, thus rapidly piston rod 27 is moved at Desired Height, as shown in the arrow 57-61 in Fig. 5.4th isolating valve 33 is preferably opened, so that can be flowed to the second accumulator 41 by the fluid media (medium) squeezed out from the upper chamber 44 of hydraulic cylinder 22, as shown in the arrow 62-63 in Fig. 5.
Between original state and passive exercise state, low-pressure fluid medium can also be made as required to flow to the upper chamber 44 of hydraulic cylinder 22 through the 4th isolating valve 33, a segment distance so that piston rod 27 is retracted in advance and be follow-up extruded ready, the flow direction of hydraulic medium and the direction of motion of piston rod 27 are as shown in the arrow 63-68 in Fig. 6.The step for can immediately active high speed return operate after carry out.In order to perform this pre-retraction operation, 3rd isolating valve 32 cuts out, 4th isolating valve 33 is opened, hydraulic medium is transported to the upper chamber 44 of hydraulic cylinder 22 by the second pump unit 25 and/or the second accumulator 41 through the 4th isolating valve 33, so that piston rod 27 moves down a segment distance and is follow-up extruded ready.Now, the second isolating valve 31 cuts out, to keep apart high-voltage power supply and high-voltage power supply.
Mode of operation shown in Fig. 5 and Fig. 6 is high-speed piston bar actively and moves operation, difference is that shown in Fig. 5 be piston rod upwards returning movement, and shown in Fig. 6 be the downward pre-retraction movement of piston rod, but they are performed corresponding operating by low pressure source as power source.
Obviously, in the case of first isolating valve the 30, second isolating valve the 31, the 3rd isolating valve the 32, the 4th isolating valve 33 is correctly isolated, the pressurized operation of each accumulator can be carried out the most at any time.Such as, in passive exercise state, the first pump unit 24 can start, and to pressurize the first accumulator 40, the second accumulator 41 can be pressurizeed in the case of the 4th isolating valve 33 cuts out by the second pump unit 25.In other duties, in principle, when high-voltage power supply performs operation, the accumulator of low pressure source pressurized operation can be performed, when low pressure source performs operation, the accumulator of high-voltage power supply pressurized operation can be performed.
In addition to check valve, each isolating valve can need to be realized by guiding valve, cartridge valve, logical valve or other valves being capable of being correctly isolated function according to the function of self.
As shown in figures 2-6, multiple parts that left-hand broken line frame is contained constitute hydraulic cylinder group.Hydraulic system 21 can include multiple such hydraulic cylinder group, and each hydraulic cylinder group can be operating independently.For the sake of clarity, hydraulic cylinder group in right side illustrates the most by dashed box.
Basic thought of the present utility model is, by arranging the low pressure source and high-voltage power supply that can be isolated from each other, low pressure source or high-voltage power supply can be made as required to perform corresponding function, such that it is able to more advantageously separately design low pressure source and high-voltage power supply, this not only saves cost, but also improves efficiency.
For a person skilled in the art, hydraulic system of the present utility model also can be used together with other devices needing this system, is not limited solely to punching unit.
And, for a person skilled in the art, other advantages of the present utility model and alternative embodiment are apparent from.Therefore, this utility model is not limited to shown and described detail, representative configurations and exemplary embodiment for its wider range of meaning.On the contrary, those skilled in the art can carry out various amendment and replacement in the case of without departing from essence spirit of the present utility model and scope.
Claims (10)
1. a hydraulic system (21), including:
Hydraulic cylinder (22), it is suitable to receive extraneous pressure and include the first chamber and the second chamber kept apart by piston；And
With the main control valve (23) of the first chamber hydraulic connecting of described hydraulic cylinder (22), described main control valve (23) is configured to the duty being suitable to control hydraulic cylinder (22)；
It is characterized in that:
Described hydraulic system (21) also includes the high-voltage power supply being suitable to export of a relatively high operating pressure and is suitable to export the low pressure source of relatively low operating pressure, wherein, described high-voltage power supply is hydraulically connected to main control valve (23) and is suitable to make hydraulic cylinder (22) be operated under the state that can carry extraneous pressure by main control valve (23), described low pressure source is hydraulically connected to main control valve (23) and hydraulic cylinder (22) and is suitable to control the duty of hydraulic cylinder (22) self when without extraneous pressure effect, described high-voltage power supply is kept apart by hydraulic isolation device with described low pressure source.
2. hydraulic system (21) as claimed in claim 1, it is characterised in that:
Described high-voltage power supply includes the first pump unit (24) and at least one high-voltage power supply accumulator；And/or
Described low pressure source includes the second pump unit (25) and at least one low pressure source accumulator.
3. hydraulic system (21) as claimed in claim 2, it is characterised in that:
The metered flow of described first pump unit (24) is less than the metered flow of described second pump unit (25).
4. hydraulic system (21) as claimed in claim 2 or claim 3, it is characterised in that:
Described first pump unit (24) and the second pump unit (25) share a driving motor；And/or
Described main control valve (23) is proportioning valve.
5. hydraulic system (21) as claimed in claim 2 or claim 3, it is characterised in that:
Described hydraulic isolation device includes multiple isolating valve, the plurality of isolating valve to be configured to be suitable to by control corresponding fluid pressure line switching on and off the hydraulic isolation realized between described high-voltage power supply and low pressure source；And/or
At least one low pressure source accumulator described includes the first low pressure source accumulator and the second low pressure source accumulator.
6. hydraulic system (21) as claimed in claim 5, it is characterised in that:
The plurality of isolating valve includes the first isolating valve (30), second isolating valve (31), 3rd isolating valve (32) and the 4th isolating valve (33), wherein, described first pump unit (24) is hydraulically connected to described high-voltage power supply accumulator and the second isolating valve (31) by the first isolating valve (30), described second isolating valve (31) is hydraulically connected to described main control valve (23), second pump unit (25) is hydraulically connected to main control valve (23) by the 3rd isolating valve (32) and is hydraulically connected to the second chamber of hydraulic cylinder (22) by the 4th isolating valve (33)；And/or
Described first low pressure source accumulator hydraulic connecting is between the second pump unit (25) and the 3rd isolating valve (32) and between the second pump unit (25) and the 4th isolating valve (33), and the second low pressure source accumulator hydraulic connecting is between the 4th isolating valve (33) and the second chamber of hydraulic cylinder (22).
7. hydraulic system (21) as claimed in claim 6, it is characterised in that:
Described first isolating valve (30), the second isolating valve (31), the 3rd isolating valve (32) and the 4th isolating valve (33) select from check valve, guiding valve, cartridge valve, logical valve；And/or
Described hydraulic cylinder (22) includes that piston rod (27), described piston rod (27) are suitable to receive extraneous pressure；And/or
Described hydraulic system includes the multiple hydraulic cylinder groups being suitable to independently operate, the plurality of hydraulic cylinder group is connected in parallel to described high-voltage power supply and low pressure source, wherein, each hydraulic cylinder group at least includes a described hydraulic cylinder (22), described main control valve (23), described second isolating valve (31), at least one high-voltage power supply accumulator described and described second low pressure source accumulator.
8. the hydraulic system (21) as described in arbitrary in claim 1-3,6-7, it is characterised in that:
Described hydraulic system applies to the hydraulic system of press, wherein, described hydraulic cylinder (22) is suitable to receive the extruded active force of the punching unit of press, described high-voltage power supply is suitable to make hydraulic cylinder (22) be operated in the described extruded active force of holding during extruded, described low pressure source is suitable to control the duty of hydraulic cylinder (22) self when acting on hydraulic cylinder (22) without extruded active force.
9. the equipment operationally producing extruding action, it is characterised in that described equipment is equipped with arbitrary described hydraulic system just like in claim 1-8, and described hydraulic system is suitable to control the execution of described extruding action.
10. equipment as claimed in claim 9, it is characterised in that
Described equipment is press, described press includes punching unit, described punching unit have the lower mold being arranged on described hydraulic cylinder (22) and with described lower mold with the use of mold, described mold is suitable to move downward with the extruded workpiece to be processed being positioned in described lower mold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620257830.7U CN205715005U (en) | 2016-03-30 | 2016-03-30 | Hydraulic system and include the equipment of this hydraulic system |
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| CN201620257830.7U CN205715005U (en) | 2016-03-30 | 2016-03-30 | Hydraulic system and include the equipment of this hydraulic system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734972A (en) * | 2017-01-09 | 2017-05-31 | 叶伟强 | A kind of hydraulic system being applied in hydraulic pressure automatic moulding machine |
| CN109139582A (en) * | 2018-09-20 | 2019-01-04 | 南京工业职业技术学院 | A kind of fitness equipment based on hydraulic system |
| CN109441913A (en) * | 2018-10-18 | 2019-03-08 | 中联重科股份有限公司 | Suspension valve, suspension system and engineering vehicle |
-
2016
- 2016-03-30 CN CN201620257830.7U patent/CN205715005U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734972A (en) * | 2017-01-09 | 2017-05-31 | 叶伟强 | A kind of hydraulic system being applied in hydraulic pressure automatic moulding machine |
| CN109139582A (en) * | 2018-09-20 | 2019-01-04 | 南京工业职业技术学院 | A kind of fitness equipment based on hydraulic system |
| CN109441913A (en) * | 2018-10-18 | 2019-03-08 | 中联重科股份有限公司 | Suspension valve, suspension system and engineering vehicle |
| CN109441913B (en) * | 2018-10-18 | 2020-01-31 | 中联重科股份有限公司 | Suspension valve, suspension system and engineering vehicle |
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