CN102218672B - Hydraulic control device for numerical control hydraulic lathe - Google Patents
Hydraulic control device for numerical control hydraulic lathe Download PDFInfo
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- CN102218672B CN102218672B CN 201110150664 CN201110150664A CN102218672B CN 102218672 B CN102218672 B CN 102218672B CN 201110150664 CN201110150664 CN 201110150664 CN 201110150664 A CN201110150664 A CN 201110150664A CN 102218672 B CN102218672 B CN 102218672B
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Abstract
The invention provides a hydraulic control device for a numerical control hydraulic lathe, comprising an oil basin, a knife frame Z-direction movement control oil cylinder YG1, a knife frame reversing solenoid valve KA2, a returned solenoid valve KA3, a guiding slow-returning solenoid valve KA4 and a working feed solenoid valve KA5, wherein an oil outlet of an oil pump YB is communicated with an oil inlet of the knife frame reversing solenoid valve KA2; a return opening of the knife frame reversing solenoid valve KA2 is communicated with the oil basin; a first reversing oil opening of the knife frame reversing solenoid valve KA2 is communicated with a port of the working feed solenoid valve KA5; the other port of the working feed solenoid valve KA5 is respectively communicated with an oil opening at one end of the knife frame Z-direction movement control oil cylinder YG1 and a port of the guiding slow-returning solenoid valve KA4; the second reversing oil opening of the knife frame reversing solenoid valve KA2 is communicated with a port of the returned solenoid valve KA3; and the other port of the returned solenoid valve KA3 is respectively communicated with the oil opening at the other end of the knife frame Z-direction movement control oil cylinder YG1 and the other port of the guiding slow-returning solenoid valve KA4. The device disclosed by the invention has the advantages of high control precision and large hydraulic force.
Description
Technical field
The present invention relates to a kind of lathe control device, specifically, relate to a kind of hydraulic control device for numerical control hydraulic lathe.
Background technology
The control of conventional hydraulic oil cylinder, with bidirectional electromagnetic valve control commutation, when hydraulic pressure led to the oil-feed of A mouth, the piston rod of liquid-driving oil cylinder stretched out movement usually, and piston rod other end liquid gushes from the B mouth and is fed back into oil sump; When the hydraulic-driven worker entered, the bidirectional electromagnetic valve outage was closed, and the hydraulic pressure fuel feeding stops, at this moment, larger pressure reduction will appear in piston in hydraulic cylinder two ends liquid, if when hydraulic oil passes through B mouth pushing piston bar retraction initial point, because of B large to pressure, will be to A to bounce-back, because liquid belongs to software power, the piston rod of hydraulic jack is in pressure reduction motion repeatedly, the bounce-back of hydraulic pressure accumulative total, the piston rod of hydraulic cylinder when the worker advances, just is difficult to reach effective precision control with regard to cumulative errors.
At the hydraulic jack control field, because rebounding, hydraulic pressure causes the deficiency of oil cylinder control accuracy, so that the application of hydraulic jack is subject to very large restriction, also so that the advantage of hydraulic jack can't fully obtain performance; Based on this, for overcoming the deficiencies in the prior art, people are seeking a kind of desirable technical scheme always.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of hydraulic control device for numerical control hydraulic lathe ingenious, simple in structure, practical, that control accuracy is high, hydraulic pressure strength is large that designs is provided.
The technical solution adopted in the present invention is as follows: a kind of hydraulic control device for numerical control hydraulic lathe, it comprises oil sump, oil pump YB, Oil pump electrical machinery DJ, knife rest Z-direction motion control oil cylinder YG1, knife rest reversing solenoid valve KA2, return magnetic valve KA3, guiding moves back slowly magnetic valve KA4 and the worker advances magnetic valve KA5, wherein, described Oil pump electrical machinery DJ drives described oil pump YB, the oil-in of described oil pump YB is communicated with described oil sump, the oil-out of described oil pump YB is communicated with the oil-in of described knife rest reversing solenoid valve KA2, the oil return opening of described knife rest reversing solenoid valve KA2 is communicated with described oil sump, the first commutation hydraulic fluid port of described knife rest reversing solenoid valve KA2 is communicated with described worker and advances magnetic valve KA5 one port, described worker advances an end hydraulic fluid port and the described guiding that magnetic valve KA5 another port is communicated with respectively described knife rest Z-direction motion control oil cylinder YG1 and moves back slowly magnetic valve KA4 one port, the second commutation hydraulic fluid port of described knife rest reversing solenoid valve KA2 is communicated with described magnetic valve KA3 one port of returning, and describedly returns other end hydraulic fluid port and the described guiding that magnetic valve KA3 another port is communicated with respectively described knife rest Z-direction motion control oil cylinder YG1 and moves back slowly magnetic valve KA4 another port.
Based on above-mentioned, it also comprises accelerates magnetic valve KA6, and the first commutation hydraulic fluid port of described knife rest reversing solenoid valve KA2 is communicated with described quickening magnetic valve KA6 one port, and described quickening magnetic valve KA6 another port is communicated with described guiding and moves back slowly magnetic valve KA4 one port.
Based on above-mentioned, it also comprises master control electromagnetic relief valve KA1, the oil-out of described oil pump YB is communicated with the oil-in of described master control electromagnetic relief valve KA1, the oil-out of described master control electromagnetic relief valve KA1 is communicated with the oil-in of described knife rest reversing solenoid valve KA2, the oil return opening of described knife rest reversing solenoid valve KA2 is communicated with the oil return import of described master control electromagnetic relief valve KA1, and the oil return outlet of described master control electromagnetic relief valve KA1 is communicated with described oil sump.
Based on above-mentioned, it also comprises knife rest rotation control oil cylinder YG2 and knife rest rotation reversing solenoid valve KA7, the oil-out of described master control electromagnetic relief valve KA1 is communicated with the oil-in of described knife rest rotation reversing solenoid valve KA7, the oil return opening of described knife rest rotation reversing solenoid valve KA7 is communicated with the oil return import of described master control electromagnetic relief valve KA1, and two commutation hydraulic fluid ports of described knife rest rotation reversing solenoid valve KA7 are communicated with respectively two hydraulic fluid ports of described knife rest rotation control oil cylinder YG2.
Based on above-mentioned, it also comprises top control oil cylinder YG3 and top reversing solenoid valve KA8, the oil-out of described master control electromagnetic relief valve KA1 is communicated with the oil-in of described top reversing solenoid valve KA8, the oil return opening of described top reversing solenoid valve KA8 is communicated with the oil return import of described master control electromagnetic relief valve KA1, and two commutation hydraulic fluid ports of described top reversing solenoid valve KA8 are communicated with respectively two hydraulic fluid ports of described top control oil cylinder YG3.
Based on above-mentioned, it also comprises hydraulic manifold block, be provided with oil circuit on the described hydraulic manifold block, described knife rest reversing solenoid valve KA2, the described magnetic valve KA3, described guiding of returning move back slowly magnetic valve KA4 and described worker and advance magnetic valve KA5 and be installed in respectively on the described hydraulic manifold block and with the corresponding port of described oil circuit and be communicated with.
Based on above-mentioned, it also comprises hydraulic manifold block, be provided with oil circuit on the described hydraulic manifold block, described knife rest reversing solenoid valve KA2, the described magnetic valve KA3, described guiding of returning move back slowly magnetic valve KA4, described worker and advance magnetic valve KA5 and described quickening magnetic valve KA6 and be installed in respectively on the hydraulic manifold block and with the corresponding port of described oil circuit and be communicated with.
Based on above-mentioned, it also comprises hydraulic manifold block, be provided with oil circuit on the described hydraulic manifold block, described master control electromagnetic relief valve KA1, described knife rest reversing solenoid valve KA2, the described magnetic valve KA3, described guiding of returning move back slowly magnetic valve KA4, described worker and advance magnetic valve KA5, described quickening magnetic valve KA6, described knife rest rotation reversing solenoid valve KA7 and described top reversing solenoid valve KA8 and be installed in respectively on the described hydraulic manifold block and with the corresponding port of described oil circuit and be communicated with.
The present invention adopts knife rest reversing solenoid valve KA2, worker to advance magnetic valve KA5, returns magnetic valve KA3 and accelerates magnetic valve KA6, can make the telescopic shaft of knife rest Z-direction motion control oil cylinder YG1 have that F.F., worker are advanced, moved back slowly, the function of rewind down; The present invention adopts guiding to move back slowly magnetic valve KA4, making hydraulic oil reach software refluxes, balance the hydraulic pressure difference at piston in hydraulic cylinder two ends, and then efficiently solve hydraulic pressure bounce-back problem in the hydraulic control, so that the control of knife rest Z-direction motion control oil cylinder YG1 is more accurate, and reach the equal control accuracy of servomotor and ball-screw, simultaneously, have again the outstanding advantages that hydraulic pressure strength is beneficial to greatly workpiece processing.
Description of drawings
Fig. 1 is syndeton schematic diagram of the present invention.
The specific embodiment
For further instruction characteristics of the present invention, the existing specific embodiment that provides by reference to the accompanying drawings:
As shown in Figure 1, a kind of hydraulic control device for numerical control hydraulic lathe, it comprises oil sump, oil pump YB, Oil pump electrical machinery DJ, knife rest Z-direction motion control oil cylinder YG1, knife rest rotation control oil cylinder YG2, top control oil cylinder YG3, master control electromagnetic relief valve KA1, knife rest reversing solenoid valve KA2, the worker advances magnetic valve KA5, return magnetic valve KA3, accelerate magnetic valve KA6, guiding is moved back magnetic valve KA4 slowly, knife rest rotation reversing solenoid valve KA7 and top reversing solenoid valve KA8, wherein, described Oil pump electrical machinery DJ drives described oil pump YB, the oil-in of described oil pump YB is communicated with described oil sump, the oil-out of described oil pump YB is communicated with the oil-in of described master control electromagnetic relief valve KA1, the oil-out of described master control electromagnetic relief valve KA1 is communicated with the oil-in of described knife rest reversing solenoid valve KA2, the oil return opening of described knife rest reversing solenoid valve KA2 is communicated with the oil return import of described master control electromagnetic relief valve KA1, the oil return outlet of described master control electromagnetic relief valve KA1 is communicated with described oil sump, the first commutation hydraulic fluid port of described knife rest reversing solenoid valve KA2 is communicated with respectively described worker and advances magnetic valve KA5 and described quickening magnetic valve KA6 one port, described worker advances magnetic valve KA5 and described quickening magnetic valve KA6 another port is connected, described worker advances an end hydraulic fluid port and the described guiding that magnetic valve KA5 another port is communicated with respectively described knife rest Z-direction motion control oil cylinder YG1 and moves back slowly magnetic valve KA4 one port, the second commutation hydraulic fluid port of described knife rest reversing solenoid valve KA2 is communicated with described magnetic valve KA3 one port of returning, and describedly returns other end hydraulic fluid port and the described guiding that magnetic valve KA3 another port is communicated with respectively described knife rest Z-direction motion control oil cylinder YG1 and moves back slowly magnetic valve KA4 another port; The worker advances magnetic valve KA5, returns magnetic valve KA3, accelerates the overfall that magnetic valve KA6, guiding move back magnetic valve KA4 slowly and is communicated with respectively described oil sump, and according to actual needs, four all can select the magnetic valve of adjustable speed.
During work, start Oil pump electrical machinery DJ and make it to drive oil pump YB, then oil pump YB is to master control electromagnetic relief valve KA1 fuel feeding; If need knife rest to advance, should make master control electromagnetic relief valve KA1, knife rest reversing solenoid valve KA2, the worker advances magnetic valve KA5 and must conduct, then oil pump YB is successively to master control electromagnetic relief valve KA1, knife rest reversing solenoid valve KA2, the worker advances magnetic valve KA5, the end hydraulic fluid port fuel feeding of knife rest Z-direction motion control oil cylinder YG1, the other end hydraulic fluid port of knife rest Z-direction motion control oil cylinder YG1 is successively by returning magnetic valve KA3, knife rest reversing solenoid valve KA2 oil return, the telescopic shaft worker of knife rest Z-direction motion control oil cylinder YG1 is advanced, further, if quickening magnetic valve KA6 must be conducted, then knife rest reversing solenoid valve KA2 also to accelerating magnetic valve KA6 fuel feeding, can make the telescopic shaft F.F. of knife rest Z-direction motion control oil cylinder YG1 simultaneously;
Usually, it is electric that quickening magnetic valve KA6 is got, so that knife rest is fast-forward to predefined position, and then quickening magnetic valve KA6 dead electricity disconnected, and the knife rest worker advanced, in order to workpiece is carried out machining;
When machining reaches predeterminated position, knife rest need commutate, at this moment, need make first guiding move back slowly magnetic valve KA4 must conduct, so that the hydraulic oil of knife rest Z-direction motion control oil cylinder YG1 one end returns the oil circuit stroke, in conjunction with advancing the fuel feeding of magnetic valve KA5 from the worker, make it a part and enter the knife rest Z-direction motion control oil cylinder YG1 other end, another part successively by return magnetic valve KA3, knife rest reversing solenoid valve KA2 returns oil sump; This mode had both realized naturally moving back slowly of knife rest Z-direction motion control oil cylinder YG1, the balanced again hydraulic pressure difference at knife rest Z-direction motion control oil cylinder YG1 two ends, effectively control the hydraulic pressure bounce-back, reduced the hydraulic pressure accumulated error, reached the high accuracy control of cutter setting frame Z-direction motion control oil cylinder YG1;
Then, if needing knife rest accelerates to retreat, should make guiding move back slowly magnetic valve KA4 dead electricity disconnects, make and return magnetic valve KA3 and must conduct, and make knife rest reversing solenoid valve KA2 commutation, then oil pump YB is successively to master control electromagnetic relief valve KA1, knife rest reversing solenoid valve KA2, return magnetic valve KA3, the other end hydraulic fluid port fuel feeding of knife rest Z-direction motion control oil cylinder YG1, the end hydraulic fluid port of knife rest Z-direction motion control oil cylinder YG1 advances magnetic valve KA5 by the worker successively, knife rest reversing solenoid valve KA2 oil return, the telescopic shaft of knife rest Z-direction motion control oil cylinder YG1 is moved back slowly, further, if quickening magnetic valve KA6 must be conducted, namely simultaneously by accelerating magnetic valve KA6 oil return, can make the telescopic shaft rewind down of knife rest Z-direction motion control oil cylinder YG1.
Based on above-mentioned, the oil-out of described master control electromagnetic relief valve KA1 is communicated with the oil-in of described knife rest rotation reversing solenoid valve KA7, the oil return opening of described knife rest rotation reversing solenoid valve KA7 is communicated with the oil return import of described master control electromagnetic relief valve KA1, and two commutation hydraulic fluid ports of described knife rest rotation reversing solenoid valve KA7 are communicated with respectively two hydraulic fluid ports of described knife rest rotation control oil cylinder YG2; By knife rest rotation reversing solenoid valve KA7, can control direction of rotation and the anglec of rotation of the rotating shaft of knife rest rotation control oil cylinder YG2, and then can control flexibly the mutual conversion of lathe saddle station.
Based on above-mentioned, the oil-out of described master control electromagnetic relief valve KA1 is communicated with the oil-in of described top reversing solenoid valve KA8, the oil return opening of described top reversing solenoid valve KA8 is communicated with the oil return import of described master control electromagnetic relief valve KA1, and two commutation hydraulic fluid ports of described top reversing solenoid valve KA8 are communicated with respectively two hydraulic fluid ports of described top control oil cylinder YG3; By top reversing solenoid valve KA8, can control the direction of motion of the telescopic shaft of top control oil cylinder YG3, and then reach the purpose of control lathe centre.
Based on above-mentioned, described worker enters magnetic valve KA5 another port and by valve K1 Pressure gauge B1 is installed; One of them commutation hydraulic fluid port of described knife rest rotation reversing solenoid valve KA7 is equipped with Pressure gauge B2 by valve K2; One of them commutation hydraulic fluid port of described top reversing solenoid valve KA8 is equipped with Pressure gauge B3 by valve K3; Three Pressure gauges detect respectively the pressure of three oil cylinders, in order to observe, judge.
Based on above-mentioned, this hydraulic control device for numerical control hydraulic lathe also comprises hydraulic manifold block, be provided with oil circuit on the described hydraulic manifold block, described master control electromagnetic relief valve KA1, described knife rest reversing solenoid valve KA2, describedly return that magnetic valve KA3, described guiding move back magnetic valve KA4 slowly, described worker advances magnetic valve KA5, described quickening magnetic valve KA6, described knife rest rotation reversing solenoid valve KA7, described top reversing solenoid valve KA8 and three groups of valve (K1, K2, K3) be installed in respectively on the described hydraulic manifold block and with the corresponding port of described oil circuit and be communicated with; Described hydraulic manifold block is that the forging material is made; Adopt hydraulic manifold block, the one, the anti-oil pressure capacity of oil circuit in it is strong, can make hydraulic control device be applicable to widely technical field, the 2nd, the oil circuit in the hydraulic manifold block, compare the oil circuit that pipeline connects and composes, greatly shortened the oil circuit stroke of hydraulic control device, make hydraulic oil can't form large bounce-back space, be beneficial to and reduce or weaken pressure reduction, and then be beneficial to the control of hydraulic pressure precision.
Of particular note: 1, the present invention not only is applicable to lathe, also be applicable to other any technical field for hydraulic control, its difference only is the difference of hydraulic cylinder purposes, type, the difference of hydraulic manifold block shape, material, and the difference of magnetic valve, reversing solenoid valve etc.; 2, in the present invention, Z-direction and X-direction, relative lathe refers to respectively horizontal and vertically, and workpiece to be machined refers to respectively vertical and horizontal relatively.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (8)
1. hydraulic control device for numerical control hydraulic lathe, it is characterized in that: it comprises oil sump, oil pump YB, Oil pump electrical machinery DJ, knife rest Z-direction motion control oil cylinder YG1, knife rest reversing solenoid valve KA2, return magnetic valve KA3, guiding moves back slowly magnetic valve KA4 and the worker advances magnetic valve KA5, wherein, described Oil pump electrical machinery DJ drives described oil pump YB, the oil-in of described oil pump YB is communicated with described oil sump, the oil-out of described oil pump YB is communicated with the oil-in of described knife rest reversing solenoid valve KA2, the oil return opening of described knife rest reversing solenoid valve KA2 is communicated with described oil sump, the first commutation hydraulic fluid port of described knife rest reversing solenoid valve KA2 is communicated with described worker and advances magnetic valve KA5 one port, described worker advances an end hydraulic fluid port and the described guiding that magnetic valve KA5 another port is communicated with respectively described knife rest Z-direction motion control oil cylinder YG1 and moves back slowly magnetic valve KA4 one port, the second commutation hydraulic fluid port of described knife rest reversing solenoid valve KA2 is communicated with described magnetic valve KA3 one port of returning, and describedly returns other end hydraulic fluid port and the described guiding that magnetic valve KA3 another port is communicated with respectively described knife rest Z-direction motion control oil cylinder YG1 and moves back slowly magnetic valve KA4 another port.
2. hydraulic control device for numerical control hydraulic lathe according to claim 1, it is characterized in that: it also comprises accelerates magnetic valve KA6, the first commutation hydraulic fluid port of described knife rest reversing solenoid valve KA2 is communicated with described quickening magnetic valve KA6 one port, and described quickening magnetic valve KA6 another port is communicated with described guiding and moves back slowly magnetic valve KA4 one port.
3. hydraulic control device for numerical control hydraulic lathe according to claim 2, it is characterized in that: it also comprises master control electromagnetic relief valve KA1, the oil-out of described oil pump YB is communicated with the oil-in of described master control electromagnetic relief valve KA1, the oil-out of described master control electromagnetic relief valve KA1 is communicated with the oil-in of described knife rest reversing solenoid valve KA2, the oil return opening of described knife rest reversing solenoid valve KA2 is communicated with the oil return import of described master control electromagnetic relief valve KA1, and the oil return outlet of described master control electromagnetic relief valve KA1 is communicated with described oil sump.
4. hydraulic control device for numerical control hydraulic lathe according to claim 3, it is characterized in that: it also comprises knife rest rotation control oil cylinder YG2 and knife rest rotation reversing solenoid valve KA7, the oil-out of described master control electromagnetic relief valve KA1 is communicated with the oil-in of described knife rest rotation reversing solenoid valve KA7, the oil return opening of described knife rest rotation reversing solenoid valve KA7 is communicated with the oil return import of described master control electromagnetic relief valve KA1, and two commutation hydraulic fluid ports of described knife rest rotation reversing solenoid valve KA7 are communicated with respectively two hydraulic fluid ports of described knife rest rotation control oil cylinder YG2.
5. hydraulic control device for numerical control hydraulic lathe according to claim 4, it is characterized in that: it also comprises top control oil cylinder YG3 and top reversing solenoid valve KA8, the oil-out of described master control electromagnetic relief valve KA1 is communicated with the oil-in of described top reversing solenoid valve KA8, the oil return opening of described top reversing solenoid valve KA8 is communicated with the oil return import of described master control electromagnetic relief valve KA1, and two commutation hydraulic fluid ports of described top reversing solenoid valve KA8 are communicated with respectively two hydraulic fluid ports of described top control oil cylinder YG3.
6. hydraulic control device for numerical control hydraulic lathe according to claim 1, it is characterized in that: it also comprises hydraulic manifold block, be provided with oil circuit on the described hydraulic manifold block, described knife rest reversing solenoid valve KA2, the described magnetic valve KA3, described guiding of returning move back slowly magnetic valve KA4 and described worker and advance magnetic valve KA5 and be installed in respectively on the described hydraulic manifold block and with the corresponding port of described oil circuit and be communicated with.
7. hydraulic control device for numerical control hydraulic lathe according to claim 2, it is characterized in that: it also comprises hydraulic manifold block, be provided with oil circuit on the described hydraulic manifold block, described knife rest reversing solenoid valve KA2, the described magnetic valve KA3, described guiding of returning move back slowly magnetic valve KA4, described worker and advance magnetic valve KA5 and described quickening magnetic valve KA6 and be installed in respectively on the hydraulic manifold block and with the corresponding port of described oil circuit and be communicated with.
8. hydraulic control device for numerical control hydraulic lathe according to claim 5, it is characterized in that: it also comprises hydraulic manifold block, be provided with oil circuit on the described hydraulic manifold block, described master control electromagnetic relief valve KA1, described knife rest reversing solenoid valve KA2, the described magnetic valve KA3, described guiding of returning move back slowly magnetic valve KA4, described worker and advance magnetic valve KA5, described quickening magnetic valve KA6, described knife rest rotation reversing solenoid valve KA7 and described top reversing solenoid valve KA8 and be installed in respectively on the described hydraulic manifold block and with the corresponding port of described oil circuit and be communicated with.
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| CN 201110150664 CN102218672B (en) | 2011-06-07 | 2011-06-07 | Hydraulic control device for numerical control hydraulic lathe |
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| CN 201110150664 CN102218672B (en) | 2011-06-07 | 2011-06-07 | Hydraulic control device for numerical control hydraulic lathe |
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| CN102218672B true CN102218672B (en) | 2013-02-27 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2083084U (en) * | 1991-02-04 | 1991-08-21 | 朴贤蜂 | Hydraulic machine tool for bearing machining |
| JP2008002505A (en) * | 2006-06-20 | 2008-01-10 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Energy saving device for construction machine |
| CN202106235U (en) * | 2011-06-07 | 2012-01-11 | 齐凤尚 | Hydraulic control device of numerical control hydraulic lathe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10278090A (en) * | 1997-04-02 | 1998-10-20 | Japan Steel Works Ltd:The | Method for controlling injection |
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- 2011-06-07 CN CN 201110150664 patent/CN102218672B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2083084U (en) * | 1991-02-04 | 1991-08-21 | 朴贤蜂 | Hydraulic machine tool for bearing machining |
| JP2008002505A (en) * | 2006-06-20 | 2008-01-10 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Energy saving device for construction machine |
| CN202106235U (en) * | 2011-06-07 | 2012-01-11 | 齐凤尚 | Hydraulic control device of numerical control hydraulic lathe |
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