CN201428662Y - Pressurizing oil cylinder - Google Patents
Pressurizing oil cylinder Download PDFInfo
- Publication number
- CN201428662Y CN201428662Y CN 200920047516 CN200920047516U CN201428662Y CN 201428662 Y CN201428662 Y CN 201428662Y CN 200920047516 CN200920047516 CN 200920047516 CN 200920047516 U CN200920047516 U CN 200920047516U CN 201428662 Y CN201428662 Y CN 201428662Y
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- oil
- oil circuit
- piston
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Abstract
The utility model discloses a pressurizing oil cylinder which comprises a cylinder body, a piston, a piston rod, a piston rod end connecting piece and an end cover. A pressurizing piston is arranged in the piston rod, an opening hole is arranged on the piston, one end of the pressurizing piston can be penetrated out from the opening hole of the piston and stretched into a first cavity of the cylinder body, the pressurizing piston is provided with a through hole, the through hole is communicated with a fourth cavity of an inner cavity of the piston rod, a first oil path and a second oil path are arranged at the end part of the cylinder body, one end of the first oil path and one end of the second oil path are respectively led to a hydraulic integration block, and an oil conduit is arrangedat the outlet position of the other end of the first oil path; the stretching end of the oil conduit penetrates through the opening hole of the piston, enters the through hole of the pressurizing piston and is communicated with the fourth cavity of the inner cavity of the piston rod; the periphery of the oil conduit and the through hole of the pressurizing piston at least keep a segment of matching in sealing and sliding manners, the other end of the second oil path is led to the first cavity of the inner cavity of the cylinder body, and a second cavity of the inner cavity of the cylinder bodyis communicated with the hydraulic integration block by a third oil path. The pressurizing oil cylinder has the characteristics of simple structure, convenient manufacturing and adjustable clamping force.
Description
Technical field
The utility model relates to the apparatus for fastening of steel rail flash welding machine, particularly a kind of hydraulic booster oil cylinder.
Background technique
The seamless process of rail track has been eliminated the seam of rail, has also eliminated the impact and the vibrations of wheel and joint gap in the train driving, has prolonged the working life of wheel track parts, has reduced maintenance expenses.Domestic existing weldering rail equipment because clamping force is not enough, can only weld the long rail string below 100 meters at present, can not satisfy welding 500 meters or longer long rail string and the needs that lock weldering.Chinese patent application number is that 98106266.0 flash welding rail welder application documents discloses a kind of reinforcement pressurizing cylinder, though its can reinforcement, its control valve is contained on the link of tailpiece of the piston rod, complex structure, is difficult to make and maintenance; Because its oil cylinder is provided with special targeting part, feasible complex structure more, size and weight are big, make difficulty, and there is the risk of leakage of oil in targeting part.In addition, it can not control the output clamping force, is not easy to constructing operation.
Summary of the invention
The purpose of this utility model is to provide a kind of clamping force that can improve pressurizing cylinder and simple and reasonable for structure, is convenient to control the pressurizing cylinder of output clamping force.
In order to achieve the above object, the technical solution of the utility model is: a kind of pressurizing cylinder, comprise cylinder body, piston, piston rod, rod end coupling and end cap, the inner chamber of cylinder body is separated into first chamber and second chamber by piston, charged piston is housed in the piston rod, piston rod cavity is pressurized piston and is separated into the 3rd chamber and the 4th chamber, second chamber is communicated with by oil circuit with the 3rd chamber, has perforate on the piston, charged piston one end can pass and put in first chamber of cylinder body from the perforate of piston, charged piston has through hole, through hole is communicated with the 4th chamber of piston rod cavity, the end of cylinder body has first oil circuit and second oil circuit, and be connected with hydraulic manifold block, one end of first oil circuit and an end of second oil circuit are all towards hydraulic manifold block, solenoid directional control valve is housed on the hydraulic manifold block, guide's reduction valve and Pilot operated check valve, oil guide pipe is equipped with in the outlet port of the other end of first oil circuit, the projecting end of oil guide pipe passes the perforate of piston and enters in the through hole of charged piston and is communicated with the 4th chamber of piston rod cavity, the periphery of oil guide pipe and the through hole of charged piston keep one section sealed sliding movingly at least, the second oil circuit the other end leads to first chamber of inner chamber of cylinder block, and second chamber of inner chamber of cylinder block is communicated with hydraulic manifold block by the 3rd oil circuit.
One end of described first oil circuit connects an end of the one-way valve on the hydraulic manifold block, guide's reduction valve in parallel on the one-way valve, the other end of one-way valve connects the oil revolving end of solenoid directional control valve, the oil inlet end of solenoid directional control valve connects one-way valve, and the pressure side of unloading of guide's reduction valve is communicated with the oil revolving end of solenoid directional control valve; One end of second oil circuit is communicated with the Pilot operated check valve on the hydraulic manifold block, and solenoid directional control valve is connected with the control oil channel of Pilot operated check valve; The 3rd oil circuit is communicated with the fuel tank loop of hydraulic manifold block.
One end of perhaps described first oil circuit connects an end of the one-way valve on the hydraulic manifold block, guide's reduction valve in parallel on the one-way valve, and the other end of one-way valve connects the oil revolving end of solenoid directional control valve, and the pressure side of unloading of guide's reduction valve is communicated with the oil revolving end of solenoid directional control valve; One end of second oil circuit is communicated with the Pilot operated check valve on the hydraulic manifold block, and solenoid directional control valve is connected with the control oil channel of Pilot operated check valve; The 3rd oil circuit is communicated with the fuel tank loop of hydraulic manifold block.
One end of perhaps described first oil circuit connects the solenoid directional control valve on the hydraulic manifold block, and solenoid directional control valve connects two oil circuits, an oil-feed oil circuit be connected in series guide's reduction valve and one-way valve, and a fuel-displaced oil circuit connects the fuel tank loop; Second oil circuit is communicated with the Pilot operated check valve on the hydraulic manifold block, and the control oil channel of Pilot operated check valve is connected with the 3rd oil circuit; The 3rd oil circuit is communicated with the fuel tank loop of hydraulic manifold block.
One end of perhaps described first oil circuit connects the solenoid directional control valve on the hydraulic manifold block, and solenoid directional control valve connects two oil circuits, oil-feed oil circuit guide's reduction valve that is connected in series, and a fuel-displaced oil circuit connects the fuel tank loop; Second oil circuit is communicated with the Pilot operated check valve on the hydraulic manifold block, and the control oil channel of Pilot operated check valve is connected with the 3rd oil circuit; The 3rd oil circuit is communicated with the fuel tank loop of hydraulic manifold block.
For charged piston being moved steadily and sealing reliably, also is fixed with interior cover near piston end in the described piston rod, the one section periphery of the piston rod part of charged piston and the endoporus sealed sliding of interior cover are movingly.
For the ease of manufacturing, and reduce cost of production, the tube portion welding of the end of described cylinder body and cylinder body is fixing, and piston rod and rod end coupling welding are fixed.
After adopting said structure,, solenoid directional control valve, guide's reduction valve and Pilot operated check valve are housed on the hydraulic manifold block because the end of cylinder body is connected with hydraulic manifold block, therefore control valve lay concentrated, simple in structure, the circuit design compactness, size is little, connects to change conveniently, is convenient to make and maintenance; Again because oil guide pipe is equipped with in the outlet port of the other end of first oil circuit, the projecting end of oil guide pipe passes the perforate of piston and enters in the through hole of charged piston and is communicated with the 4th chamber of piston rod cavity, the periphery of oil guide pipe and the through hole of charged piston keep one section sealed sliding movingly at least, therefore having cancelled application number is the special targeting part of pressurizing cylinder in 98106266.0 documents, and the subsidiary effect that oil cylinder stroke direction guiding is arranged of oil guide pipe of the present utility model, oil guide pipe is located at cylinder interior, do not take the length space of oil cylinder, so the utility model structure is simpler, compact, be convenient to make, eliminated the risk of leakage of oil; Also owing on the hydraulic manifold block solenoid directional control valve, guide's reduction valve and Pilot operated check valve are housed, therefore can realize Electromagnetic Control, make and clamp the reinforcement process automation, simultaneously by regulating the output oil pressure of guide's reduction valve, the input oil pressure of the inner chamber of control pressurizing cylinder, the control boost pressure reaches the purpose of exporting adjustable clamping force, be convenient to constructing operation, can guarantee that clamping force is not subjected to the influence and the needs that adapt to the different rail length of clamping of jaw wearing and tearing.The utility model can adapt to the needs of the rail that picks up all lengths, weight, especially can press from both sides 500 meters or longer rail, simultaneously can reduce the negative effect that too high supercharging causes, as: hydraulic fluid leak increases under the high pressure, and oil cylinder such as reduces working life at problem.
Description of drawings
The embodiment who provides below in conjunction with accompanying drawing is described in further detail the utility model.
Fig. 1 is the structural representation of a kind of pressurizing cylinder of the present utility model;
Fig. 2 is the plan view of Fig. 1;
Fig. 3 is the clamped condition figure of Fig. 2;
Fig. 4 is the reinforcement phase diagram of Fig. 2;
Fig. 5 is first embodiment's of the present utility model hydraulic pressure linking route figure;
Fig. 6 is second embodiment's of the present utility model hydraulic pressure linking route figure;
Fig. 7 is the 3rd embodiment's of the present utility model hydraulic pressure linking route figure;
Fig. 8 is the 4th embodiment's of the present utility model hydraulic pressure linking route figure.
Embodiment
As Fig. 1,2,3, shown in 5, be first embodiment of the present utility model, a kind of pressurizing cylinder, comprise cylinder body 1, piston 2, piston rod 3, rod end coupling 3-1 and end cap 7, the inner chamber of cylinder body 1 is separated into the first chamber α and the second chamber β by piston 2, charged piston 5 is housed in the piston rod 3, piston rod 3 inner chambers are pressurized piston 5 and are separated into the 3rd chamber γ and the 4th chamber δ, the second chamber β is communicated with by oil circuit 1c with the 3rd chamber γ, has perforate 2-1 on the piston 2, charged piston 5 one ends can pass and put in the first chamber α of cylinder body 1 from the perforate 2-1 of piston 2, charged piston 5 has through hole 5-2, through hole 5-2 is communicated with the 4th chamber δ of piston rod 3 inner chambers, the end 1-1 of cylinder body 1 has the first oil circuit 1a and the second oil circuit 1b, and be connected with hydraulic manifold block 8, the end of the end of the first oil circuit 1a and the second oil circuit 1b is all towards hydraulic manifold block 8, solenoid directional control valve 11 is housed on the hydraulic manifold block 8, guide's reduction valve 10 and Pilot operated check valve 13, oil guide pipe 6 is equipped with in the outlet port of the other end of the first oil circuit 1a, the projecting end of oil guide pipe 6 passes the perforate 2-1 of piston 2 and enters among the through hole 5-2 of charged piston 5 and is communicated with the 4th chamber δ of piston rod 3 inner chambers, the through hole 5-2 of the periphery of oil guide pipe 6 and charged piston 5 keeps one section sealed sliding movingly at least, the second oil circuit 1b the other end leads to the first chamber α of cylinder body 1 inner chamber, and the second chamber β of cylinder body 1 inner chamber is communicated with hydraulic manifold block 8 by the 3rd oil circuit 1d.
Shown in Fig. 1,5, the end of the described first oil circuit 1a connects an end of the one-way valve 9 on the hydraulic manifold block 8, guide's reduction valve 10 in parallel on the one-way valve 9, the other end of one-way valve 9 connects the oil revolving end of solenoid directional control valve 11, the oil inlet end of solenoid directional control valve 11 connects one-way valve 12, and the pressure side of unloading of guide's reduction valve 10 is communicated with the oil revolving end of solenoid directional control valve 11; The end of the second oil circuit 1b is communicated with the Pilot operated check valve 13 on the hydraulic manifold block 8, and solenoid directional control valve 11 is connected with the control oil channel of Pilot operated check valve 13; The 3rd oil circuit 1d is communicated with the fuel tank loop of hydraulic manifold block 8.
Shown in Fig. 1,3,4, for charged piston is moved steadily and sealing reliable, cover 4 in also being fixed with near piston 2 ends in the described piston rod 3, the one section periphery of the piston rod part 5-3 of charged piston 5 and the endoporus 4-1 sealed sliding of interior cover 4 are movingly.
As shown in Figure 1, 2, for the ease of manufacturing, and reduce cost of production, the 1-2 of the tube portion welding of the end 1-1 of described cylinder body 1 and cylinder body 1 is fixing, and piston rod 3 welds fixing with rod end coupling 3-1.
As shown in Figure 6, be second embodiment's of the present utility model hydraulic pressure linking route figure.The end of the described first oil circuit 1a connects an end of the one-way valve 9 on the hydraulic manifold block 8, guide's reduction valve 10 in parallel on the one-way valve 9, the other end of one-way valve 9 connects the oil revolving end of solenoid directional control valve 11, and the pressure side of unloading of guide's reduction valve 10 is communicated with the oil revolving end of solenoid directional control valve 11; The end of the second oil circuit 1b is communicated with the Pilot operated check valve 13 on the hydraulic manifold block 8, and solenoid directional control valve 11 is connected with the control oil channel of Pilot operated check valve 13; The 3rd oil circuit 1d is communicated with the fuel tank loop of hydraulic manifold block 8.This embodiment compares with first embodiment shown in Figure 5, and difference is that one-way valve 12 moves to outside the hydraulic manifold block 8, is placed on the oil outlet end of the external oil hydraulic pump of the utility model 17, and all the other are identical with first embodiment.
As shown in Figure 7, be the 3rd embodiment's of the present utility model hydraulic pressure linking route figure.The end of the described first oil circuit 1a connects the solenoid directional control valve 11 on the hydraulic manifold block 8, and solenoid directional control valve 11 connects two oil circuits, and be connected in series guide's reduction valve 10 and 12, one fuel-displaced oil circuits of one-way valve of oil-feed oil circuit connect the fuel tank loop; The second oil circuit 1b is communicated with the Pilot operated check valve 13 on the hydraulic manifold block 8, and the control oil channel of Pilot operated check valve 13 is connected with the 3rd oil circuit 1d; The 3rd oil circuit 1d is communicated with the fuel tank loop of hydraulic manifold block 8.Compare with first embodiment, difference is to have removed one-way valve 9 on hydraulic manifold block 8, has changed the connection of the control oil channel of the connection of solenoid directional control valve 11 and Pilot operated check valve 13.
As shown in Figure 8, be the 4th embodiment's of the present utility model hydraulic pressure linking route figure.The end of the described first oil circuit 1a connects the solenoid directional control valve 11 on the hydraulic manifold block 8, and solenoid directional control valve 11 connects two oil circuits, and oil-feed oil circuit 10, one fuel-displaced oil circuits of guide's reduction valve that are connected in series connect the fuel tank loop; The second oil circuit 1b is communicated with the Pilot operated check valve 13 on the hydraulic manifold block 8, and the control oil channel of Pilot operated check valve 13 is connected with the 3rd oil circuit 1d; The 3rd oil circuit 1d is communicated with the fuel tank loop of hydraulic manifold block 8.This embodiment compares with the 3rd embodiment shown in Figure 7, and difference is that one-way valve 12 moves to outside the hydraulic manifold block 8, is placed on the oil outlet end of the external oil hydraulic pump of the utility model 17, and all the other are identical with the 3rd embodiment.
During the utility model work, connect oil hydraulic pump 17, fuel tank 15 and control panel earlier.
Shown in Fig. 1,3,5, with first embodiment of the utility model is example, process from the open configuration to the clamped condition: the clamping button of control panel is got to the clamping position, pressure oil from oil hydraulic pump 17 is opened Pilot operated check valve 13 by the oil circuit of hydraulic manifold block 8 inside, simultaneously, pressure oil enters the first chamber α by Pilot operated check valve 13 through the second oil circuit 1b, promotes piston 2 and piston rod 3 to the motion of end cap 7 directions, and the hydraulic oil of the second chamber β is through the 3rd oil circuit 1d oil sump tank 15; Charged piston 5 also begins to move to the termination of piston rod 3 simultaneously, the second chamber β hydraulic oil flows into the 3rd chamber γ through oil circuit 1c, and the 4th chamber δ hydraulic oil enters hydraulic manifold block 8 through oil guide pipe 6, the first oil circuit 1a, through solenoid directional control valve 11, the oil return circuit of the first oil circuit 1a flows back to fuel tank 15.
Shown in Fig. 3,4,5, the process from the clamped condition to the pressurized state: press control panel supercharging button, solenoid directional control valve 11 actions, the control oil channel of Pilot operated check valve 13 does not have pressure oil, and Pilot operated check valve 13 is closed, and the second oil circuit 1b closes.Pressure oil enters the 4th chamber δ through one-way valve 12, guide's reduction valve 10, solenoid directional control valve 11, the first oil circuit 1a and oil guide pipe 6; The second chamber β and the 3rd chamber γ connect fuel tank 15, and pressure is zero; Charged piston 5 is to the motion of the end of cylinder body 1 1-1 direction, and the first chamber α oil pressure increases.Pressure raising ratio be charged piston 5 large end faces long-pending with oil guide pipe 6 oil duct areas difference and the ratio of the difference of charged piston 5 small end areas and oil guide pipe 6 external diameters.
Shown in Fig. 4,5,1, the process from the pressurized state to the open configuration: control panel is clamped button get to and open the position, solenoid directional control valve 11 dead electricity, action.The 3rd oil circuit advances pressure oil, Pilot operated check valve 13 is opened, pressure oil advances the second chamber β through the 3rd oil circuit 1d, promotes piston 2 and piston rod 3 to the motion of the end of cylinder body 1 1-1 direction, simultaneously, the second chamber β hydraulic oil enters the 3rd chamber γ through oil circuit 1c, promote charged piston 5 to the motion of the termination of piston rod 3 direction, the 4th chamber δ fluid enters hydraulic manifold block 8 through the oil guide pipe 6 and the first oil circuit 1a, through solenoid directional control valve 11, the oil return circuit of the first oil circuit 1a flows back to fuel tank 15.
Claims (7)
1, a kind of pressurizing cylinder, comprise cylinder body (1), piston (2), piston rod (3), rod end coupling (3-1) and end cap (7), the inner chamber of cylinder body (1) is separated into first chamber (α) and second chamber (β) by piston (2), charged piston (5) is housed in the piston rod (3), piston rod (3) inner chamber is pressurized piston (5) and is separated into the 3rd chamber (γ) and the 4th chamber (δ), second chamber (β) is communicated with by oil circuit (1c) with the 3rd chamber (γ), it is characterized in that:
Have perforate (2-1) on a, the piston (2), charged piston (5) one ends can pass and put in first chamber (α) of cylinder body (1) from the perforate (2-1) of piston (2),
B, charged piston (5) have through hole (5-2), and through hole (5-2) is communicated with the 4th chamber (δ) of piston rod (3) inner chamber,
The end (1-1) of c, cylinder body (1) has first oil circuit (1a) and second oil circuit (1b), and is connected with hydraulic manifold block (8),
One end of one end of d, first oil circuit (1a) and second oil circuit (1b) is all towards hydraulic manifold block (8),
Solenoid directional control valve (11), guide's reduction valve (10) and Pilot operated check valve (13) are housed on e, the hydraulic manifold block (8),
Oil guide pipe (6) is equipped with in the outlet port of the other end of f, first oil circuit (1a), the projecting end of oil guide pipe (6) passes the perforate (2-1) of piston (2) and enters in the through hole (5-2) of charged piston (5) and is communicated with the 4th chamber (δ) of piston rod (3) inner chamber, the through hole (5-2) of the periphery of oil guide pipe (6) and charged piston (5) keeps one section sealed sliding movingly at least
G, second oil circuit (1b) the other end lead to first chamber (α) of cylinder body (1) inner chamber,
Second chamber (β) of h, cylinder body (1) inner chamber is communicated with hydraulic manifold block (8) by the 3rd oil circuit (1d).
2, pressurizing cylinder according to claim 1, it is characterized in that: an end of described first oil circuit (1a) connects an end of the one-way valve (9) on the hydraulic manifold block (8), one-way valve (9) is gone up guide's reduction valve in parallel (10), the other end of one-way valve (9) connects the oil revolving end of solenoid directional control valve (11), the oil inlet end of solenoid directional control valve (11) connects one-way valve (12), and the pressure side of unloading of guide's reduction valve (10) is communicated with the oil revolving end of solenoid directional control valve (11); One end of second oil circuit (1b) is communicated with the Pilot operated check valve (13) on the hydraulic manifold block (8), and solenoid directional control valve (11) is connected with the control oil channel of Pilot operated check valve (13); The 3rd oil circuit (1d) is communicated with the fuel tank loop of hydraulic manifold block (8).
3, pressurizing cylinder according to claim 1, it is characterized in that: an end of described first oil circuit (1a) connects an end of the one-way valve (9) on the hydraulic manifold block (8), one-way valve (9) is gone up guide's reduction valve in parallel (10), the other end of one-way valve (9) connects the oil revolving end of solenoid directional control valve (11), and the pressure side of unloading of guide's reduction valve (10) is communicated with the oil revolving end of solenoid directional control valve (11); One end of second oil circuit (1b) is communicated with the Pilot operated check valve (13) on the hydraulic manifold block (8), and solenoid directional control valve (11) is connected with the control oil channel of Pilot operated check valve (13); The 3rd oil circuit (1d) is communicated with the fuel tank loop of hydraulic manifold block (8).
4, pressurizing cylinder according to claim 1, it is characterized in that: an end of described first oil circuit (1a) connects the solenoid directional control valve (11) on the hydraulic manifold block (8), solenoid directional control valve (11) connects two oil circuits, an oil-feed oil circuit be connected in series guide's reduction valve (10) and one-way valve (12), a fuel-displaced oil circuit connects the fuel tank loop; Second oil circuit (1b) is communicated with the Pilot operated check valve (13) on the hydraulic manifold block (8), and the control oil channel of Pilot operated check valve (13) is connected with the 3rd oil circuit (1d); The 3rd oil circuit (1d) is communicated with the fuel tank loop of hydraulic manifold block (8).
5, pressurizing cylinder according to claim 1, it is characterized in that: an end of described first oil circuit (1a) connects the solenoid directional control valve (11) on the hydraulic manifold block (8), solenoid directional control valve (11) connects two oil circuits, oil-feed oil circuit guide's reduction valve (10) that is connected in series, a fuel-displaced oil circuit connects the fuel tank loop; Second oil circuit (1b) is communicated with the Pilot operated check valve (13) on the hydraulic manifold block (8), and the control oil channel of Pilot operated check valve (13) is connected with the 3rd oil circuit (1d); The 3rd oil circuit (1d) is communicated with the fuel tank loop of hydraulic manifold block (8).
6, pressurizing cylinder according to claim 1, it is characterized in that: also be fixed with interior cover (4) near piston (2) end in the described piston rod (3), the one section periphery of the piston rod part (5-3) of charged piston (5) and endoporus (4-1) sealed sliding of interior cover (4) are movingly.
7, pressurizing cylinder according to claim 1 is characterized in that: the end (1-1) of described cylinder body (1) is welded with the tube portion (1-2) of cylinder body (1) and is fixed, and piston rod (3) is fixing with rod end coupling (3-1) welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920047516 CN201428662Y (en) | 2009-06-30 | 2009-06-30 | Pressurizing oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920047516 CN201428662Y (en) | 2009-06-30 | 2009-06-30 | Pressurizing oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201428662Y true CN201428662Y (en) | 2010-03-24 |
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ID=42032399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920047516 Expired - Lifetime CN201428662Y (en) | 2009-06-30 | 2009-06-30 | Pressurizing oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201428662Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629591B (en) * | 2009-06-30 | 2012-06-06 | 常州市瑞泰工程机械有限公司 | Pressurizing cylinder |
| CN102661297A (en) * | 2012-05-30 | 2012-09-12 | 江苏扬力数控机床有限公司 | Hydraulic system of numerical control turrent punch press and working method of hydraulic system |
-
2009
- 2009-06-30 CN CN 200920047516 patent/CN201428662Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629591B (en) * | 2009-06-30 | 2012-06-06 | 常州市瑞泰工程机械有限公司 | Pressurizing cylinder |
| CN102661297A (en) * | 2012-05-30 | 2012-09-12 | 江苏扬力数控机床有限公司 | Hydraulic system of numerical control turrent punch press and working method of hydraulic system |
| CN102661297B (en) * | 2012-05-30 | 2014-08-13 | 江苏扬力数控机床有限公司 | Hydraulic system of numerical control turrent punch press and working method of hydraulic system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100324 Effective date of abandoning: 20090630 |