CN2626646Y - Cylinder pushing hydraulic screw press - Google Patents
Cylinder pushing hydraulic screw press Download PDFInfo
- Publication number
- CN2626646Y CN2626646Y CN 03255501 CN03255501U CN2626646Y CN 2626646 Y CN2626646 Y CN 2626646Y CN 03255501 CN03255501 CN 03255501 CN 03255501 U CN03255501 U CN 03255501U CN 2626646 Y CN2626646 Y CN 2626646Y
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Abstract
The utility model relates to a cylinder pushing type hydraulic screw press. A machine frame is provided with a threaded rod of which the upper end is provided with a flywheel, the lower end is provided with a slide block and an upper die, and the slide block can slide up and down on the machine frame so as to press forge pieces. At least two hydraulic operation cylinder bodies are fixed at both sides of the machine frame, and cylinder rods are fixedly connected with the slide block. Conical through holes are arranged at the central parts of the upper end covers of the hydraulic operation cylinder bodies. Corresponding conical cushioning bodies are arranged at the front ends of the cylinder rods. Key ways are arranged simultaneously at both the bottom of a cap nut and the upper part of a cap nut base in a fixing device of the threaded rod and the slide block, and are fixedly connected by flat keys. An auxiliary valve core of a servo valve connecting with a handle in the hydraulic system is connected with a valve core of a tribit cross joint slide valve through a mechanical connecting rod. The utility model has the advantages of simple structure, reliable performance, sensitive operation, etc., effectively prevents the slide block from colliding the top, greatly improves the work efficiency of the press with ensured safety, enhances the screwing force and the radial direction bearing capability of the threaded rod and the cap nut, and betters the susceptiveness of a hydraulic control system.
Description
Technical field
The utility model relates to a kind of forging machinery and equipment, particularly the cylinder pushing type hydraulic screw press.
Background technology
Traditional nothing is decided the journey forging equipment and mainly is divided into double plate friction press and hydraulic screw press two big classes such as oil motor formula, clutch type.The former noise is big, fault rate is high, and nominal pressure is confined to below the 2500T.Though the latter does not have the former many drawbacks, its complex structure, manufacturing cost height, and this machine equipment price costliness.
The cylinder pushing type hydraulic screw press is to utilize the thrust of hydraulic cylinder and drive work done by the gravity of flywheel, screw rod, slide block and motion parts that patrix constitutes, and realizes the compacting forging.This hydraulic screw press is compared with the hydraulic screw press of types such as sub-screw formula, oil motor formula; simple in structure; make easily; cost is low, and is easy to maintenance, but traditional hydraulic screw press brake and overload protection arrangement fault rate height; poor reliability; the sensitivity of hydraulic control system is poor, and limitation is big, is not suitable for the large-tonnage hydraulic screw press.Such as fly press of the prior art, its screw rod is to be connected with nut thread by screw rod with the structure of slide block, makes a call on screw rod and nut that a straight pin is fixing to be become flexible preventing again.This nut anti-looseness structure, owing to straight pin is difficult to bear from the bigger radial load of forcing press in working order, so and very easily produce the gap between screw rod and the nut, to such an extent as to cause nut loosening,, directly influence the operating efficiency of forcing press until damage.Brake apparatus in traditional for another example metal forming machinerys such as double disk friction screw press mostly adopts the mechanical type braking, and the brake apparatus of this structure reliability in actual use is relatively poor, the fault rate height, brake band often ruptures, and wearing piece is aging, often causes brake fade.
Summary of the invention
Technical problem to be solved in the utility model is to overcome existing defective in the above-mentioned prior art, provides a kind of structure simpler, the reliability height, and the hydraulic control system sensitivity is good, practical novel cylinder pushing type hydraulic screw press.
The utility model has adopted following technical proposal to solve its technical problem: a kind of cylinder pushing type hydraulic screw press, comprise frame, be equipped with rotating screw rod on this frame, the upper end of this screw rod is fixedly equipped with flywheel, the lower end of screw rod is fixedly equipped with slide block and patrix, this slide block can be done upper and lower slip along the groove on the frame, realizes suppressing forging with this.It is characterized in that: be equipped with two hydraulic cylinder bodies at least and be fixed on the both sides of frame, this cylinder piston bar is fixedlyed connected with the slide block on the frame; Hydraulic cylinder body upper end cover central part has cone-shaped hole, and the piston rod front end is corresponding conical buffer body; When piston rod moved up and down, its conical buffer body and upper end cover cone-shaped hole were the shape that is slidingly connected; Nut bottom in screw rod and slide block fixture is equipped with keyway, and nut seat top also is equipped with keyway, and nut is fixedlyed connected by flat key with nut seat keyway between the two; The servo valve of a connection handle in the hydraulic system, its auxiliary valve core is connected by the spool of mechanical linkage with the 3-position 4-way guiding valve.
The utlity model has following tangible technique effect:
1, the utility model has been removed the rub double plate of examining forcing press of original double plate and is rubbed and examine disc mechanism, in the both sides of frame or be equipped with the working hydraulic pressure working cylinder all around as power resources, thrust that can the hydraulic control working cylinder drives the partly work done of weight-driven of moving component, realize the compacting forging, have simple in structure, dependable performance is controlled advantages such as sensitivity; Working cylinder has played the effect of balance slide block again simultaneously, so also removed two compensating cylinders in the conventional helical forcing press in the utility model.
2, replace mechanical brake device with hydraulic damping device, the cone-shaped hole of buffer body and working cylinder upper end cover forms a throttling annular distance, cushion by this throttling annular distance, reach braking effect, prevented the top of hitting of slide block effectively, improve the operating efficiency of forcing press greatly, guaranteed its security.
3, improve nut anti-looseness structure in screw rod and the slide block coupling arrangement, improved the screwing force of screw rod and nut, can improve the radially ability to bear of nut greatly.
4, be pilot valve control heavy caliber guiding valve with the servo valve, improve the sensitivity of hydraulic control system, and setting have the high-capacity accumulator of the accumulator of hydraulic cushion function for no piston in the hydraulic control system.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is the utility model structure side view;
Fig. 3 is another example structure schematic diagram of the utility model;
Fig. 4 is the utility model hydraulic housing structure cutaway view;
Fig. 5 is the structure cutaway view Amplified image of the utility model screw rod and slide block fixture;
Fig. 6 is the utility model hydraulic system structure schematic diagram.
Each sequence number is expressed as respectively in the accompanying drawing:
1 frame, 2 screw rods, 3 flywheels, 4 slide blocks, 5 hydraulic cylinder bodies, 5.1 epicoele, 5.2 cavity of resorption, 6 bolts, 7 piston rods, 7.1 piston, 8 nuts, 9 upper end covers, 10 cone-shaped holes, 11 conical buffer bodies, 12 nuts, 13 nut seats, 14 flat keys, 15 bolts, 16 bearings, 17 control cranks, 18 servo valves, 18.1 main valve plug, 18.2 auxiliary valve core, 19 mechanical linkages, 20 3-position 4-way guiding valves, 20.1 spool, 21 check valves, 22 oil pumps, 23 fuel tanks, 24 accumulators, 25 hydraulic control one-way valves, 26 check valves, 27 check valves, 29 electromagnetic relief valves, 30 oil transfer pumps, the oily oil feed pump of 31 controls, 32 check valves, 33 electromagnetic relief valves, 34 two-position three way solenoid directional control valves, 35 oil level controllers, 36 feedback devices, A 3-position 4-way guiding valve delivery outlet, B 3-position 4-way guiding valve delivery outlet, P 3-position 4-way guiding valve input port, T 3-position 4-way guiding valve oil return opening.
The specific embodiment
Come the utility model is further described below in conjunction with accompanying drawing and embodiment.
See figures.1.and.2, the utility model comprises frame 1, is equipped with rotatable screw rod 2 on this frame 1, the upper end of this screw rod 2 is fixedly equipped with flywheel 3, the lower end of screw rod 2 is fixedly equipped with slide block 4 and patrix, and this slide block 4 can be done upper and lower slip along the groove on the frame 1, realizes suppressing forging with this.
The utility model is equipped with two hydraulic cylinder bodies 5 at least, and is symmetrically fixed on by bolt 6 on the both sides of frame, and this cylinder piston bar 7 is fixedlyed connected by nut 8 with the slide block 4 on the frame 1.
With reference to Fig. 3, have among this embodiment four hydraulic cylinder bodies 5 by bolt 6 be symmetrically fixed on frame 1 around on, piston rod 7 is fixedlyed connected by nut 8 respectively with slide block 4.
With reference to Fig. 4, the utility model hydraulic cylinder body 5 upper ends are by the fixedly connected upper end cover 9 of screw thread.These upper end cover 9 central parts have cone-shaped hole 10, and connect conduit under fluid pressure,
Piston rod 7 upper ends connect and upper end cover central part cone-shaped hole 10 corresponding conical buffer bodies 11 by screw, and promptly hydraulic cylinder body 5 upper end cover cone-shaped holes 10 are identical with the tapering and the taper direction of the conical buffer body 11 of piston rod.
The bottom of working cylinder 5 has the turnover oilhole, and connects conduit under fluid pressure.During the upper and lower motion of piston rod 7, its conical buffer body 11 is the shape that is slidingly connected with upper end cover cone-shaped hole 10.
The tapering of cone-shaped hole 10, conical buffer body 11 is 2～5 degree, and active length is 60～120mm.Cone-shaped hole 10 is 5 degree with the tapering of conical buffer body 11 in the present embodiment, and active length is 120mm.
During the utility model work, piston rod 7 moves up and down, because both are cone shape cone-shaped hole 10 and conical buffer body 11, hydraulic system drives piston rod 7 motions, and in constantly sliding, both contact can be more and more tightr, and form a throttling annular distance, cushion by this throttling annular distance, reach braking effect, prevented the top of hitting of slide block 4 effectively.The utility model has improved the operating efficiency of forcing press greatly, has guaranteed its security.
With reference to Fig. 5, nut 12 bottoms of the utility model in screw rod 2 and slide block 4 fixtures are equipped with keyway, and nut seat 13 tops also are equipped with keyway, and nut 12 is fixedlyed connected by flat key 14 with nut seat 13 keyway between the two.
The lead angle of screw rod 2 described in the utility model is 15 ° ± 1 °, and its spiro rod length is 3375 millimeters on the forcing press of 1600 tons of nominals, and screw diameter is 500 millimeters, and nut length is 1030 millimeters, and the nut diameter is 690 millimeters; Its spiro rod length is 3475 millimeters on the forcing press of 2000 tons of nominals, and screw diameter is 550 millimeters, and nut length is 1110 millimeters, and the nut diameter is 790 millimeters; Its spiro rod length is 3980 millimeters on the forcing press of 3000 tons of nominals, and screw diameter is 650 millimeters, and nut length is 1300 millimeters, and the nut diameter is 940 millimeters; Its spiro rod length is 4450 millimeters on the forcing press of 4000 tons of nominals, and screw diameter is 750 millimeters, and nut length is 1600 millimeters, and the nut diameter is 750 millimeters.
With reference to Fig. 6, the servo valve 18 of a connection control crank 17 in the hydraulic system described in the utility model, its auxiliary valve core 18.2 is connected with the spool 20.1 of 3-position 4-way guiding valve 20 by mechanical linkage 19.
This 3-position 4-way guiding valve 20 delivery outlet A, B are connected with the upper and lower chamber 5.1,5.2 of hydraulic cylinder body 5 by conduit under fluid pressure respectively, its corresponding input port P of delivery outlet A that connects cylinder body cavity of resorption 5.2 hydraulic tubes is connected with oil pump 22 by conduit under fluid pressure, check valve 21, and its corresponding oil return inlet T of delivery outlet B that connects cylinder body epicoele 5.1 hydraulic tubes is connected with fuel tank 23 by conduit under fluid pressure.
One accumulator 24 is connected with cylinder body cavity of resorption 5.2 hydraulic tubes by hydraulic control one-way valve 25 and check valve 26, and is connected with cylinder body epicoele hydraulic tube by check valve 27, and in addition, check valve 21 output channels that it also is connected with oil pump 22 are connected.
Below sketch operation principle of the present utility model:
When control crank 17 mediated, the slide block 4 of hydraulic screw press was in halted state.At this moment, oil pump 22 is given accumulator 24 oilings, when the oil level pressure in the accumulator 24 reaches setting value, and electromagnetic relief valve 29 off-loads, oil pump 22 carries out idle loop.Oil transfer pump 30 aims at oil pump 22 fuel feeding, and purpose is to make oil pump 22 oil suctions abundant, and the efficient height reduces noise, improves oil pump life.
When control crank 17 is in when upper, the main valve plug 18.1 of servo valve 18 moves to left, and the oil in a chamber flows into the c chamber by the inner passage of auxiliary valve core 18.2 at this moment, flows back to fuel tank, auxiliary valve core 18.2 moves to left under the pressure oil effect from the oily oil feed pump 31 of control, move to left thereby drive 3-position 4-way guiding valve 20 spools 20.1, open this valve A mouth, enter the cavity of resorption of the piston 7.1 in the hydraulic cylinder body 5 from the pressure oil of accumulator 24, pressure oil promotes piston stroking upward, drive slide block 4, screw rod 2, flywheel 3 is up.
Need stop slide block when up, can be with 17 times centre positions of control crank, close 3-position 4-way guiding valve 20, the pressure oil that enter the cavity of resorption of the piston 7.1 in the hydraulic cylinder body 5 this moment is cut off, because the inertia of motion parts makes the cavity of resorption of the piston 7.1 in the hydraulic cylinder body 5 produce suction, inhale opening one-way valve 32, with the suction carrying out of the oil in the fuel tank 23 repairing, the hydraulic oil of the epicoele of the piston 7.1 in the hydraulic cylinder body 5 can back down check valve 27, enter accumulator 24 through hydraulic control one-way valve 25, cushion by accumulator 24, absorb the kinetic energy of motion parts.
When control crank 17 is in upper/lower positions, the main valve plug 18.1 of servo valve 18 moves to right, from pressure oil the inner passage through auxiliary valve core 18.2 and main valve plug 18.1 between of controlling oily oil feed pump 31 enter a chamber in the b chamber this moment, at a, under the pressure acting in conjunction in b chamber, auxiliary valve core 18.2 move to right (active force in a chamber is greater than the active force in b chamber), thereby driving 3-position 4-way guiding valve 20 spools moves to right, open this valve B mouth, enter the epicoele of the piston 7.1 in the hydraulic cylinder body 5 from the pressure oil of accumulator 24, pressure oil promotes piston 7.1 descending drive slide blocks 4, screw rod 2, flywheel 3 is descending, and flywheel 3 constantly rotates in descending process and stores the required kinetic energy of compacting forging.Flywheel is in descending process, reduce the energy of slide block compacting forging if desired, control crank 17 can be pulled to the centre and be closed 3-position 4-way guiding valve 12, the cut-out pressure oil sources, stop to supply pressure oil to the epicoele of the piston in the hydraulic pressure working cylinder 54, this moment, the inertia of motion parts made the epicoele of the piston 4 in the hydraulic cylinder body 5 produce suction, inhale opening one-way valve 10, oil in the fuel tank 27 sucks and carries out repairing, the hydraulic oil of the cavity of resorption of the piston 4 in the hydraulic cylinder body 5 can back down check valve 13, enter accumulator 18 through hydraulic control one-way valve 16, cushion by accumulator 18, absorb the kinetic energy of motion parts, thereby reduce the energy of slide block compacting forging, reach the purpose of regulating energy.
Oil pump 31 is oil feed pumps that the hydraulic system of control oil is provided for servo valve 18.The effect of electromagnetic relief valve 31 is to ensure oil hydraulic system off-load when oil pump 31 starts, and oil pump enters No Load Start, regulates the pressure of oil hydraulic system simultaneously.The effect of two-position three way solenoid directional control valve 34 is to ensure that under stopped status hydraulic control one-way valve 25 reliably closes, and makes the pressure oil leakage loss not in the accumulator 24, ensures that under open state hydraulic control one-way valve 25 opens, for oil hydraulic system provides pressure oil.The effect of electromagnetic relief valve 29 is to ensure oil hydraulic system off-load when main oil pump 22 starts, oil pump 22 No Load Starts, and regulating system pressure is pressed and off-load on the control system.
The upward pressure of electromagnetic relief valve 29 and off-load come sender to realize control automatically by oil level controllers 20.When the oil level in the accumulator 24 when set going up the position, by the signalling component sender of oil level controllers 35, electromagnetic relief valve 29 off-loads, system enters idle loop; When the oil level in the accumulator 24 when setting upper/lower positions, by the signalling component sender of oil level controllers 35, press on the electromagnetic relief valve 29, system gives accumulator 24 for pressure oils.
The effect of feedback device 36 is when reducing slide block 4 and being up to extreme position, caused impact when motion parts stops suddenly.By feedback device 36, before slide block 4 rises to extreme position, run into feedback device 36, move control crank 17 to centre position by push and pull system, close 3-position 4-way guiding valve 20 by servo valve 18, make oil piping system supply pressure oil no longer for the cavity of resorption of the piston 7.1 in the hydraulic pressure working cylinder 5, eliminate the rising power of slide block 4 parts, prevent to hit the top.
Claims (11)
1, a kind of cylinder pushing type hydraulic screw press, comprise frame, be equipped with rotating screw rod on this frame, the upper end of this screw rod is fixedly equipped with flywheel, the lower end of screw rod is fixedly equipped with slide block and patrix, and this slide block can be done upper and lower slip along the groove on the frame, realizes suppressing forging with this, it is characterized in that: be equipped with two hydraulic cylinder bodies at least and be fixed on the both sides of frame, this cylinder piston bar is fixedlyed connected with the slide block on the frame; Hydraulic cylinder body upper end cover central part has cone-shaped hole, and the piston rod front end is corresponding conical buffer body; When piston rod moved up and down, its conical buffer body and upper end cover cone-shaped hole were the shape that is slidingly connected; Nut bottom in screw rod and slide block fixture is equipped with keyway, and nut seat top also is equipped with keyway, and nut is fixedlyed connected by flat key with nut seat keyway between the two; The servo valve of a connection handle in the hydraulic system, its auxiliary valve core is connected by the spool of mechanical linkage with the 3-position 4-way guiding valve.
2, a kind of cylinder pushing type hydraulic screw press according to claim 1 is characterized in that: two hydraulic cylinder bodies are symmetrically fixed on by bolt on the both sides of frame, and piston rod is fixedlyed connected by nut with slide block.
3, a kind of cylinder pushing type hydraulic screw press according to claim 1 is characterized in that: have four hydraulic cylinder bodies by bolt be symmetrically fixed on frame around on, piston rod is fixedlyed connected by nut with slide block.
4, a kind of cylinder pushing type hydraulic screw press according to claim 1 is characterized in that: hydraulic cylinder body upper end cover cone-shaped hole is identical with the tapering and the taper direction of the conical buffer body of piston rod.
5, a kind of cylinder pushing type hydraulic screw press according to claim 1 is characterized in that: hydraulic cylinder piston bar front end connects conical buffer body by screw.
6, a kind of cylinder pushing type hydraulic screw press according to claim 1 is characterized in that: hydraulic cylinder body front end is by the fixedly connected upper end cover of screw thread.
7, according to claim 1 or 4 described a kind of cylinder pushing type hydraulic screw presses, it is characterized in that: the tapering of cone-shaped hole, conical buffer body is 2～5 degree, and active length is 60～120mm.
8, a kind of cylinder pushing type hydraulic screw press according to claim 1 is characterized in that: nut and nut seat outer rim in screw rod and the slide block fixture are bolted to connection.
9, according to claim 1 or 8 described a kind of cylinder pushing type hydraulic screw presses, it is characterized in that: the lead angle of described screw rod is 15 ° ± 1 °, its spiro rod length is 3375 millimeters on the forcing press of 1600 tons of nominals, screw diameter is 500 millimeters, nut length is 1030 millimeters, and the nut diameter is 690 millimeters; Its spiro rod length is 3475 millimeters on the forcing press of 2000 tons of nominals, screw diameter is 550 millimeters, nut length is 1110 millimeters, the nut diameter is 790 millimeters: its spiro rod length is 3980 millimeters on the forcing press of 3000 tons of nominals, screw diameter is 650 millimeters, nut length is 1300 millimeters, and the nut diameter is 940 millimeters; Its spiro rod length is 4450 millimeters on the forcing press of 4000 tons of nominals, and screw diameter is 750 millimeters, and nut length is 1600 millimeters, and the nut diameter is 750 millimeters.
10, a kind of cylinder pushing type hydraulic screw press according to claim 1, it is characterized in that: 3-position 4-way guiding valve delivery outlet is connected with the upper and lower chamber of hydraulic cylinder body by conduit under fluid pressure respectively in the hydraulic system, its corresponding input port of delivery outlet that connects cylinder body cavity of resorption hydraulic tube is connected with oil pump by conduit under fluid pressure, check valve, and its corresponding oil return opening of delivery outlet that connects cylinder body epicoele hydraulic tube is connected with fuel tank by conduit under fluid pressure.
11, a kind of cylinder pushing type hydraulic screw press according to claim 1, it is characterized in that: an accumulator is connected with cylinder body cavity of resorption hydraulic tube by hydraulic control one-way valve and check valve, and be connected with cylinder body epicoele hydraulic tube by another check valve, the check valve output channel that also is connected with oil pump is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03255501 CN2626646Y (en) | 2003-07-10 | 2003-07-10 | Cylinder pushing hydraulic screw press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03255501 CN2626646Y (en) | 2003-07-10 | 2003-07-10 | Cylinder pushing hydraulic screw press |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2626646Y true CN2626646Y (en) | 2004-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03255501 Expired - Lifetime CN2626646Y (en) | 2003-07-10 | 2003-07-10 | Cylinder pushing hydraulic screw press |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2626646Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012171338A1 (en) * | 2011-06-14 | 2012-12-20 | 成都快典科技有限公司 | Forging apparatus |
| CN102922764A (en) * | 2012-11-23 | 2013-02-13 | 上海运良锻压机床有限公司 | Push cylinder type hydraulic screw press |
| CN105149494A (en) * | 2015-09-02 | 2015-12-16 | 武汉新威奇科技有限公司 | Electric screw press and downward ejection device |
| CN106311949A (en) * | 2016-10-28 | 2017-01-11 | 青岛格林特环保设备有限公司 | Electric screw oil hydraulic press adopting composite oil cylinders for maintaining pressure |
| CN109909419A (en) * | 2019-04-11 | 2019-06-21 | 无锡市前洲西塘锻压有限公司 | A kind of ellipse head forging equipment |
| CN112427595A (en) * | 2020-11-13 | 2021-03-02 | 江苏新泰隆管件有限公司 | Automatic screw press convenient to maintain |
-
2003
- 2003-07-10 CN CN 03255501 patent/CN2626646Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012171338A1 (en) * | 2011-06-14 | 2012-12-20 | 成都快典科技有限公司 | Forging apparatus |
| CN102922764A (en) * | 2012-11-23 | 2013-02-13 | 上海运良锻压机床有限公司 | Push cylinder type hydraulic screw press |
| CN102922764B (en) * | 2012-11-23 | 2015-01-07 | 上海运良锻压机床有限公司 | Push cylinder type hydraulic screw press |
| CN105149494A (en) * | 2015-09-02 | 2015-12-16 | 武汉新威奇科技有限公司 | Electric screw press and downward ejection device |
| CN106311949A (en) * | 2016-10-28 | 2017-01-11 | 青岛格林特环保设备有限公司 | Electric screw oil hydraulic press adopting composite oil cylinders for maintaining pressure |
| CN106311949B (en) * | 2016-10-28 | 2018-01-09 | 青岛格林特环保设备有限公司 | Composite oil cylinder protective voltage type electric screw hydraulic press |
| CN109909419A (en) * | 2019-04-11 | 2019-06-21 | 无锡市前洲西塘锻压有限公司 | A kind of ellipse head forging equipment |
| CN109909419B (en) * | 2019-04-11 | 2020-07-17 | 无锡市前洲西塘锻压有限公司 | Forging and pressing equipment for oval end socket |
| CN112427595A (en) * | 2020-11-13 | 2021-03-02 | 江苏新泰隆管件有限公司 | Automatic screw press convenient to maintain |
| CN112427595B (en) * | 2020-11-13 | 2022-08-16 | 江苏新泰隆管件有限公司 | Automatic screw press convenient to maintain |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130710 Granted publication date: 20040721 |