CN102658320A - Hydraulic cylinder of numerical-control turret punch press - Google Patents
Hydraulic cylinder of numerical-control turret punch press Download PDFInfo
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- CN102658320A CN102658320A CN201210173711XA CN201210173711A CN102658320A CN 102658320 A CN102658320 A CN 102658320A CN 201210173711X A CN201210173711X A CN 201210173711XA CN 201210173711 A CN201210173711 A CN 201210173711A CN 102658320 A CN102658320 A CN 102658320A
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Abstract
The invention discloses a hydraulic cylinder of a numerical-control turret punch press and relates to a driving hydraulic cylinder for a pressing head of a high-speed numerical-control turret punch press. The hydraulic cylinder of the numerical-control turret punch press is simpler in structure and lower in energy consumption and can replace an imported like product on the premise that requirements on three working processes and high-frequency operation are met. The hydraulic cylinder comprises a cylinder body and a piston with multiple shoulders, the cylinder body consists of a feeding oil port, a fast forward oil port, a fast backward oil port, an oil return port and a boss arranged in the middle of the inner wall of the cylinder body, the piston consists of a piston body and a driving rod arranged at the lower end of the piston body, an upper shoulder is disposed on the outer edge of the top end surface of the piston body, and a lower shoulder is arranged on the outer edge of the bottom end surface of the piston body. A four-cavity structure is creatively provided in terms of the structure of the cylinder, and requirements on actions of three working processes can be met. In addition, overseas technical barriers in the field of high-speed numerical-control plate processing equipment are broken through, the current situation of overseas monopolization is also broken, and a national technical gap is filled.
Description
Technical field
The present invention relates to a kind of hydraulic cylinder of high-speed numeric control press machine, particularly relate to a kind of high-speed numeric control rotating tower punch staking punch and drive hydraulic cylinder.
Background technology
Along with the progress in epoch, development of science and technology, the raising of productivity, common mechanical type numerical control rotating tower punch is because drawing velocity is slow, noise is big etc. shortcoming, have gradually by the fluid pressure type NC turret punch machine replacement trend.Because the restriction of technical conditions and industrial level, domestic numerical control rotating tower punch hydraulic system is difficult to meet design requirement, and manufacturer is mostly from certain famous hydraulic pressure company import NC turret punch machine hydraulic system of Germany.
The drift of high-speed numeric control rotating tower punch is moving as follows: F.F. (sky advances, no-load), worker advance (the contact plate is to cutting off plate), rewind down (sky moves back); Under the situation that satisfies these three workflows, also very strict to rate request, maximum operating frequency reaches 1000-1200 time/minute.
For satisfying above job requirement, the hydraulic system of this famous hydraulic pressure company adopts the high and low pressure duplex pump as power source, in two generation products, has increased accumulator as the energy reserves device.It is big that system has a flow, the characteristics that drawing velocity is fast.Adopting high pressure valve, low pressure valve to carry out high-low pressure in the system advances to control to F.F., worker.
Concrete operation principle is following:
1), oil cylinder stops: the high-low pressure duplex pump is the accumulator topping up through low pressure valve, is full of the back off-load;
2), oil cylinder F.F.: accumulator and high-low pressure duplex pump provide low pressure oil for the oil cylinder F.F. simultaneously;
3), the oil cylinder worker advances: when mould touched plate, oil cylinder transferred the worker to from F.F. automatically and advances, and high-pressure pump advances to provide hydraulic oil for the oil cylinder worker, and low-lift pump is the accumulator topping up.
4), oil cylinder rewind down: accumulator and high-low pressure duplex pump provide low pressure oil for the oil cylinder rewind down simultaneously.
The problem that exists is:
1), purchase cost is high; At present, this product of the said firm is in monopoly position in the world, and price is controlled by it, makes purchase cost expensive, finally causes the complete machine cost to increase;
2), oil circuit is complicated, fault rate is high; Owing to adopt duplex pump, three of accumulators " power source ", the oil circuit of these three " power sources " need make whole oil circuit complicated especially through some Hydraulic Elements and master cylinder formation work loop, and fault rate is high;
3), oil return shakes greatly needs installation buffer; Owing to adopt high-capacity pump is arranged, make that the oil return flow is big, when backhaul, produce bigger vibration easily;
4), flow is big, needs to adopt big latus rectum valve; High-pressure pump output high-pressure low-flow hydraulic oil, low-lift pump output low pressure and mass flow hydraulic oil needs the heavy caliber fluid pressure line could satisfy the demand of oil circuit; And the fluid pressure line bore is when big, the corresponding apparatus cost, take up room also high;
5), energy rate is low; Adopted two pumps, made that the energy consumption of overall operation is big, the efficiency conversion ratio is low.
Summary of the invention
The present invention is directed to above problem, provide a kind of under the prerequisite that satisfies three workflows, high-frequency operation requirement, structure is simple more, energy consumption is lower, and the hydraulic cylinder of the NC turret punch machine of ability substituting import one product.
Technical scheme of the present invention: said hydraulic jack comprises the piston of cylinder body and many shoulders;
Said cylinder body comprises worker's oil-in, fast oil-in, rewind down hydraulic fluid port, oil return opening and is located at a circle boss at said inboard wall of cylinder block middle part;
Said piston comprises piston body and the drive rod that is located at said piston body lower end, and the top end face outer rim of said piston body is provided with a circle, and upward convex shoulder, bottom face outer rim are provided with circle convex shoulder down.
Said going up constitutes worker's oil suction chamber between convex shoulder end face and the said cylinder body inner top surface, said worker's oil suction chamber connects said worker's oil-in;
Constitute the rewind down oil pocket between the bottom surface of said upward convex shoulder and the said boss upper surface, said rewind down oil pocket connects said rewind down hydraulic fluid port;
Constitute fast oil suction chamber between the end face of said convex shoulder down and the said boss lower surface, said fast oil suction chamber connects said fast oil-in;
Constitute oil back chamber between the bottom surface of said convex shoulder down and the said cylinder body inner bottom surface, said oil back chamber connects said oil return opening;
The work area sum of said rewind down oil pocket and oil back chamber is greater than the work area of said worker's oil suction chamber;
The work area sum of said fast oil suction chamber and worker's oil suction chamber is greater than the work area of said oil back chamber.
The upper end of said piston body is fixedly connected with the piston rod that the worker advances the work area adjustment, and said cylinder body upper end is provided with mesopore, and said piston rod and said mesopore flexibly connect through the oil circuit seal.
Said cylinder body has upper end cover and bottom end cover, and said upper end cover and bottom end cover are provided with the taper platform that protrudes in end face respectively towards the end face pars intermedia of inner chamber of cylinder block.
The one circle boss at said inboard wall of cylinder block middle part is divided into epicoele and cavity of resorption with said cylinder body; The internal diameter of said boss is less than the internal diameter of epicoele and cavity of resorption;
The last convex shoulder of said piston body cooperates with said epicoele liquid sealing, the following convex shoulder of said piston body cooperates with said cavity of resorption liquid sealing, said upward convex shoulder encloses the boss liquid sealing with the piston body part and said between the following convex shoulder and cooperates.
The last convex shoulder of said piston body is equipped with chamfering with the outward flange of the upper and lower end face of following convex shoulder.
The present invention has proposed to have adopted four cavity configurations originally aspect cylinder structure, deft design, and quick and graceful in the movements, step is reasonable, can satisfy the action demand of three workflows.Around this Promethean cylinder structure, can cooperate with special hydraulic circuit, this hydraulic circuit only needs an oil pump and a spot of Hydraulic Elements; Since only need an oil pump, therefore more energy-conservation with respect to foreign technology; And when adopting single pump as power source, flow is little, and the oil return vibrations are little, need not to select for use big latus rectum valve, also greatly reduce the cost of equipment.Because Hydraulic Elements are few, make that oil circuit of the present invention is simple, fault rate is low, and fault is got rid of simple.The present invention is simple in structure, cost is low, and the operating rate of the realization of present technique is high, is easy to production domesticization; The external control original paper of this hydraulic system only needs a 3-position 4-way solenoid directional control valve in addition; Simply (other element passes through setup parameter each other in control when making the whole system operation; Realize the interlock cross complaint), motion is smooth more, and system is stable more, reliable.At last, the present invention has broken through external technology barriers, has broken the present situation of external monopolization in high-speed numeric control sheet machining apparatus field, has filled up domestic technological gap.
Description of drawings
Fig. 1 is the structural representation of oil cylinder of the present invention,
Fig. 2 is the structural representation of cylinder body of the present invention,
Fig. 3 is the structural representation of the another kind of form of cylinder body of the present invention,
Fig. 4 is a structure of piston sketch map of the present invention,
Fig. 5 is the sketch map of F.F. action of the present invention,
Fig. 6 is the sketch map of F.F. action of the present invention,
Fig. 7 is the sketch map of rewind down action of the present invention,
Fig. 8 is the practical implementation structural representation of oil cylinder of the present invention,
Fig. 9 is the schematic diagram that hydraulic cylinder of the present invention and special hydraulic circuit are used state;
1 is cylinder body among the figure, the 10th, and boss, the 11st, worker's oil suction chamber, the 110th, worker's oil-in, the 12nd, fast oil suction chamber; The 120th, fast oil-in, the 13rd, oil back chamber, the 130th, oil return opening, the 14th, fast oil suction chamber, the 140th, rewind down hydraulic fluid port; The 15th, drive rod hole, the 16th, piston rod hole, the 18th, upper end cover, the 180th, upper end cover boss; The 181st, epicoele groove, the 19th, bottom end cover, the 190th, bottom end cover boss, the 191st, cavity of resorption groove;
The 2nd, piston, the 20th, piston body, the 201st, drive rod, the 202nd, piston body, the 21st, following convex shoulder, the 211st, the F.F. working face, the 212nd, the oil return working face, the 22nd, last convex shoulder, the 221st, the worker advances working face, and the 222nd, the F.F. working face,
The 31st, overflow valve, the 32nd, two-position three way hydraulicdirectional control valve, the 33rd, 3-position 4-way solenoid directional control valve, the 34th, motor, the 35th, hydraulic pump, the 36th, check valve one, 37th, inserted valve, the 38th, check valve two, 39th, oil return strainer valve, the 40th, fuel tank.
The specific embodiment
Patent of the present invention comprises attacking head driving oil cylinder and hydraulic drive circuit shown in Fig. 1-8, said attacking head driving oil cylinder comprises the piston 2 of cylinder body shoulder more than 1
Said cylinder body 1 comprises worker's oil-in 110, fast oil-in 120, rewind down hydraulic fluid port 140, oil return opening 130 and is located at a circle boss 10 at said cylinder body 1 inwall middle part;
Said piston 2 comprises piston body 20 and the drive rod 201 that is located at said piston body 20 lower ends, and the top end face outer rim of said piston body 20 is provided with a circle, and upward convex shoulder 22, bottom face outer rim are provided with circle convex shoulder 21 down; Form described many shoulders piston body structure.
Need the special hydraulic drive circuit of explanation the present invention to comprise fuel tank 40, hydraulic pump 35,3-position 4-way solenoid directional control valve 33, two-position three way pilot operated directional control valve 32, check valve 1, check valve 2 38, inserted valve 37 and overflow valve 31; Said 3-position 4-way solenoid directional control valve 33 has A1, B1, P1, T1 mouth and coil Y01, coil Y02; Said two-position three way pilot operated directional control valve 32 has A2, T2, P2 mouth and control end X2; Said inserted valve 37 has A3, B3 mouth and control end X3;
The P1 mouth of said 3-position 4-way solenoid directional control valve 33 is connected hydraulic pump 35 respectively with the P2 of two-position three way pilot operated directional control valve 32; The A1 mouth of said 3-position 4-way solenoid directional control valve 33 connects said rewind down hydraulic fluid port 140; The B1 mouth connects fast oil-in 120; The B1 mouth also connects the control port X2 of said two-position three way pilot operated directional control valve 32 through the control oil circuit, the T1 mouth connects the oil-in of said check valve 2 38, the A3 mouth and the said oil return opening 130 of inserted valve 37; The A2 mouth of said two-position three way pilot operated directional control valve 32 connects the B3 mouth of said worker's oil-in 110 and said inserted valve 37 through said check valve 1; The X3 mouth of said inserted valve 37 connects the A2 mouth of said two-position three way pilot operated directional control valve 32 through the control oil circuit; Said overflow valve 31 is parallel-connection structure with said two-position three way pilot operated directional control valve 32, and the oil-out of said overflow valve 31 (the T mouth of overflow valve 31 among Fig. 1) connects the T2 and the fuel tank 40 of said two-position three way pilot operated directional control valve 32;
The oil-out of said check valve 2 38 connects fuel tank 40.
Oil cylinder of the present invention has formed four working chambers through the piston of cylinder body and many shoulders structure:
Said going up constitutes worker's oil suction chamber 11 between convex shoulder 22 end faces and said cylinder body 1 inner top surface, said worker's oil suction chamber 11 connects said worker's oil-in 110; Constitute rewind down oil pocket 14 between the bottom surface of said upward convex shoulder 22 and said boss 10 upper surfaces, said rewind down oil pocket 14 connects said rewind down hydraulic fluid port 140; Constitute fast oil suction chamber 12 between the end face of said convex shoulder 21 down and said boss 10 lower surfaces, said fast oil suction chamber connects said fast oil-in 120; Constitute oil back chamber 13 between the bottom surface of said convex shoulder 21 down and the inner bottom surface of said cylinder body 1, said oil back chamber 13 connects said oil return opening 130; The work area sum of said rewind down oil pocket 14 and oil back chamber 13 is greater than the work area of said worker's oil suction chamber 11; The work area sum of said fast oil suction chamber 12 and worker's oil suction chamber 11 is greater than the work area of said oil back chamber 13.
For realizing the structure in above-mentioned four chambeies, when concrete the making, a circle boss 10 at said cylinder body 1 inwall middle part is divided into epicoele and cavity of resorption with said cylinder body 1; The internal diameter of said boss 10 is less than the internal diameter of epicoele and cavity of resorption;
The last convex shoulder 22 of said piston body 20 cooperates with said epicoele liquid sealing, the following convex shoulder 21 of said piston body 20 cooperates with said cavity of resorption liquid sealing, said upward convex shoulder 22 encloses boss 10 liquid sealings with the piston body part (this part external diameter is less than the external diameter of last convex shoulder 22 with following convex shoulder 21) and said between the following convex shoulder 21 and cooperates.
Consider from guiding and adjustment operating pressure; The upper end of said piston body 20 is fixedly connected with the piston rod 202 that the worker advances the work area adjustment; Said cylinder body 1 upper end is provided with mesopore (being piston rod hole 16), and said piston rod 202 flexibly connects through the oil circuit seal with said mesopore.Certainly, mesopore also can not established in cylinder body 1 upper end, and is as shown in Figure 4.
From consideration easy to process, that set piston stroke and working chamber oil mass; Said cylinder body 1 has upper end cover 18 and bottom end cover 19, and said upper end cover 18 is provided with the taper platform (being upper end cover boss 180, bottom end cover boss 190) that protrudes in end face with bottom end cover 19 respectively towards the end face pars intermedia of cylinder body 1 inner chamber.Be provided with after two boss; After piston and cylinder body 1 assembling; Can form cavity of resorption groove 191 and epicoele groove 181 (hypotenuse, piston end surface and inboard wall of cylinder block by boss constitute); Make the worker's oil-in 110 be opened on the inboard wall of cylinder block have the oil-feed space with oil return opening 130, in other words, can reduce cylinder body volume, reduce with oil mass, increase stroke.
The last convex shoulder of said piston body is equipped with chamfering with the outward flange of the upper and lower end face of following convex shoulder.Be from optimization equally, promptly guarantee under the situation of limes superiors position and limit inferior position stroke, leave enough into and out of oily space to fast oil suction chamber 12 and rewind down oil pocket 14 oil-feed spaces; In other words, can reduce piston volume, reduce with oil mass, increase stroke.
Said hydraulic drive circuit also comprises return filter 39; Said return filter 39 is serially connected between check valve 2 38 and the fuel tank 40.
In when trial-production, oil cylinder of the present invention is as shown in Figure 8, and cylinder part has adopted cylinder body 1, the bottom end cover 19 of tubular, the package assembly of upper end cover 18; Piston portion adopts piston body 20, drive rod 201, convex shoulder 21 constitutes an overall structure, the structure that is connected with piston rod 202 down; So that process, keep in repair.
The operation principle that of the present invention and special hydraulic circuit cooperates is as shown in Figure 9:
This hydraulic system is driven as unique power source by hydraulic pump 35, and realizes that through the flow direction that various hydraulic pressure components and parts are controlled the hydraulic oil in four chambeies F.F., the worker of oil cylinder advance and these three workflows of rewind down; And control the switching-over of two-position three way pilot operated directional control valve 32 through the pressure oil of described fast oil suction chamber 12, realize that oil cylinder changed a job into by F.F. automatically; Combination through inserted valve 37 and check valve 2 38 realizes the complementation of worker's oil suction chamber 11 and oil back chamber 13 hydraulic oil when F.F. and rewind down.
1), initial station; Three-dimensional four-way electromagnetic reversing valve 33 mediate the position (must not); Hydraulic pump 35 outlet hydraulic oil flow into the T1 mouth through solenoid directional control valve P1 mouth; Flow back to fuel tank through check valve 2 38 and return filter 39 again, realize that oil cylinder stops, off-load, energy savings (piston is in initial station).
2), the oil cylinder F.F., the coil Y02 of three-dimensional four-way electromagnetic reversing valve 33 gets electric, hydraulic oil flows into the B1 mouth through solenoid directional control valve P1 mouth, gets into the fast oil suction chamber 12 of oil cylinder, realizes the oil cylinder F.F.; When inserted valve 37 control end X3 did not have pressure oil, its A3 mouth and B3 mouth were in on-state.The hydraulic oil of oil cylinder rewind down oil pocket 14 flows into the T1 mouth through the A1 mouth of three-dimensional four-way electromagnetic reversing valve 33, and the A3 mouth through inserted valve 37 flows into the B3 mouth again, gets into worker's oil suction chamber 11; The hydraulic oil of oil back chamber 13 flows into the B3 mouth through the A3 mouth of inserted valve 37, gets into worker's oil suction chamber 11; After the hydraulic oil of oil cylinder rewind down oil pocket 14 and oil back chamber 13 was full of oil cylinder worker oil suction chamber 11, unnecessary hydraulic oil flowed back to fuel tank 40 through check valve 2 38 and return filter 39.
3), the oil cylinder worker advances; The coil Y02 of three-dimensional four-way electromagnetic reversing valve 33 keeps; When mould touches plate; Drive rod 201 produces load immediately; The pressure of the fast oil suction chamber 12 of oil cylinder raises, and when pressure reaches the operating pressure of two-position three way hydraulicdirectional control valve (as: 250bar), promotes 32 switching-overs of two-position three way pilot operated directional control valve; Hydraulic oil breaks off inserted valve A3, B3 mouth through the control end X3 of two-position three way pilot operated directional control valve 32 entering inserted valves 37, gets into worker's oil suction chambers 11 through check valve 1 simultaneously.At this moment hydraulic oil pressurizes to fast oil suction chamber 12 and common oil suction chamber 11 simultaneously, and the realization oil cylinder is changed a job into by F.F. automatically; The hydraulic oil of oil cylinder rewind down oil pocket 14 flows into the T1 mouth through the A1 mouth of 3-position 4-way solenoid directional control valve 33, flows back to fuel tank 40 through check valve 2 38 and return filter 39 again; The hydraulic oil of oil cylinder oil back chamber 13 flows back to fuel tank 40 through check valve 2 38 and return filter 39; When mould during towards the threading material, drive rod 201 unloadings, fast oil suction chamber 12 pressure of oil cylinder reduce, and the valve core reset of two-position three way pilot operated directional control valve 32, oil cylinder revert to the F.F. state automatically.
4), the oil cylinder rewind down, the coil Y01 of two-position three way pilot operated directional control valve 32 gets electric, the P1 mouth of hydraulic oil through two-position three way pilot operated directional control valve 32 flows into the A1 mouth, gets into oil cylinder rewind down oil pocket 14, realizes the oil cylinder rewind down; The hydraulic oil of the fast oil suction chamber 12 of oil cylinder flows into the T1 mouth through the B1 mouth of three-dimensional four-way electromagnetic reversing valve 33, gets into oil cylinder oil back chamber 13; The hydraulic oil of oil cylinder worker oil suction chamber 11 flows into the A3 mouth through the B3 mouth of inserted valve 37, gets into oil cylinder oil back chamber 13; After the hydraulic oil of the fast oil suction chamber 12 of oil cylinder and worker's oil suction chamber 11 was full of oil cylinder oil back chamber 13, unnecessary hydraulic oil flowed back to fuel tank 40 through check valve 2 38 and return filter 39.Accomplish an operation cycle.
Through overtesting, the performance parameter of the present invention and the hydraulic system of Germany certain brand and model is to such as table 1;
Table 1:
| ? | The present invention | The hydraulic system of certain brand and model of Germany |
| Maximum stamping press (kN) | 320 | 330 |
| Fast forward speed (mm/s) | 255 | 220 |
| Work speed (mm/s) | 44 | 24 |
| Rewind down speed (mm/s) | 255 | 320 |
| Hydraulic pump flow (L/min) | 30 (single pumps) | 19 (high-pressure pump)+48 (low-lift pump) |
| Power of motor (kW) | 11 | 11 |
Visible by last table, the motor of employing equal-wattage, the present invention is when satisfying three actions, and operational factor reaches the service requirement of imported hydraulic system basically.With respect to this imported hydraulic system, simple in structure, more energy-conservation.
Claims (6)
1. the hydraulic cylinder of a NC turret punch machine is characterized in that, said hydraulic jack comprises the piston of cylinder body and many shoulders;
Said cylinder body comprises worker's oil-in, fast oil-in, rewind down hydraulic fluid port, oil return opening and is located at a circle boss at said inboard wall of cylinder block middle part;
Said piston comprises piston body and the drive rod that is located at said piston body lower end, and the top end face outer rim of said piston body is provided with a circle, and upward convex shoulder, bottom face outer rim are provided with circle convex shoulder down.
2. the hydraulic cylinder of a kind of NC turret punch machine according to claim 1 is characterized in that, said going up constitutes worker's oil suction chamber between convex shoulder end face and the said cylinder body inner top surface, and said worker's oil suction chamber connects said worker's oil-in;
Constitute the rewind down oil pocket between the bottom surface of said upward convex shoulder and the said boss upper surface, said rewind down oil pocket connects said rewind down hydraulic fluid port;
Constitute fast oil suction chamber between the end face of said convex shoulder down and the said boss lower surface, said fast oil suction chamber connects said fast oil-in;
Constitute oil back chamber between the bottom surface of said convex shoulder down and the said cylinder body inner bottom surface, said oil back chamber connects said oil return opening;
The work area sum of said rewind down oil pocket and oil back chamber is greater than the work area of said worker's oil suction chamber;
The work area sum of said fast oil suction chamber and worker's oil suction chamber is greater than the work area of said oil back chamber.
3. the hydraulic cylinder of a kind of NC turret punch machine according to claim 1; It is characterized in that; The upper end of said piston body is fixedly connected with the piston rod that the worker advances the work area adjustment, and said cylinder body upper end is provided with mesopore, and said piston rod and said mesopore flexibly connect through the oil circuit seal.
4. the hydraulic cylinder of a kind of NC turret punch machine according to claim 1 is characterized in that, said cylinder body has upper end cover and bottom end cover, and said upper end cover and bottom end cover are provided with the taper platform that protrudes in end face respectively towards the end face pars intermedia of inner chamber of cylinder block.
5. the hydraulic cylinder of a kind of NC turret punch machine according to claim 1 is characterized in that, a circle boss at said inboard wall of cylinder block middle part is divided into epicoele and cavity of resorption with said cylinder body; The internal diameter of said boss is less than the internal diameter of epicoele and cavity of resorption;
The last convex shoulder of said piston body cooperates with said epicoele liquid sealing, the following convex shoulder of said piston body cooperates with said cavity of resorption liquid sealing, said upward convex shoulder encloses the boss liquid sealing with the piston body part and said between the following convex shoulder and cooperates.
6. the hydraulic cylinder of a kind of NC turret punch machine according to claim 1 is characterized in that, the last convex shoulder of said piston body is equipped with chamfering with the outward flange of the upper and lower end face of following convex shoulder.
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| CN201210173711.XA CN102658320B (en) | 2012-05-30 | 2012-05-30 | Hydraulic cylinder of numerical-control turret punch press |
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| CN201210173711.XA CN102658320B (en) | 2012-05-30 | 2012-05-30 | Hydraulic cylinder of numerical-control turret punch press |
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Cited By (6)
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| CN103233940A (en) * | 2013-05-06 | 2013-08-07 | 赵明 | Buffer hydraulic cylinder for forklift |
| CN105987041A (en) * | 2015-01-27 | 2016-10-05 | 杨双来 | Novel double-acting single piston type hydraulic cylinder |
| CN106734488A (en) * | 2016-12-27 | 2017-05-31 | 重庆维庆液压机械有限公司 | For the hydraulic jack of punching press |
| CN111623003A (en) * | 2020-06-12 | 2020-09-04 | 香河凯华齿轮有限公司 | Pressure system for forging gears |
| CN111894940A (en) * | 2020-08-05 | 2020-11-06 | 合力（天津）能源科技股份有限公司 | Mechanical oil cylinder structure capable of automatically reciprocating |
| CN112855672A (en) * | 2021-02-08 | 2021-05-28 | 中国铁建重工集团股份有限公司 | Hot oil flushing and replacing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103233940A (en) * | 2013-05-06 | 2013-08-07 | 赵明 | Buffer hydraulic cylinder for forklift |
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| CN112855672A (en) * | 2021-02-08 | 2021-05-28 | 中国铁建重工集团股份有限公司 | Hot oil flushing and replacing system |
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|---|---|
| CN102658320B (en) | 2014-04-09 |
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Effective date of registration: 20230410 Address after: No. 108 Weiyang Road, Economic Development Zone, Yangzhou City, Jiangsu Province, 225009 Patentee after: Yangzhou Jiucheng Real Estate Co.,Ltd. Address before: No. 499 Yangzi Jiangnan Road, Yangzhou City, Jiangsu Province, 225127 Patentee before: Jiangsu Yangli CNC Machine Tools Co.,Ltd. |
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Denomination of invention: A hydraulic cylinder for a CNC turret punch press Effective date of registration: 20230911 Granted publication date: 20140409 Pledgee: Bank of China Limited Yangzhou Development Zone Branch Pledgor: Yangzhou Jiucheng Real Estate Co.,Ltd. Registration number: Y2023320000453 |
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Correction item: Pledgee Correct: Bank of China Limited Yangzhou Development Zone Branch False: Bank of China Limited Yangzhou Development Zone Branch Number: 39-02 Volume: 39 |
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