CN104588625A - Gravity casting machine conducting tilting motion and tilting motion hydraulic control system of gravity casting machine. - Google Patents
Gravity casting machine conducting tilting motion and tilting motion hydraulic control system of gravity casting machine. Download PDFInfo
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- CN104588625A CN104588625A CN201410796372.XA CN201410796372A CN104588625A CN 104588625 A CN104588625 A CN 104588625A CN 201410796372 A CN201410796372 A CN 201410796372A CN 104588625 A CN104588625 A CN 104588625A
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- valve
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- gravity casting
- control system
- rotational lock
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D35/00—Equipment for conveying molten metal into beds or moulds
- B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
Abstract
The invention provides a gravity casting machine conducting tilting motion and a tilting motion hydraulic control system of the gravity casting machine. The gravity casting machine comprises a base, an opening and closing type mechanism, a vertical ejection device, a machine frame, an electrical control system and the hydraulic control system, the machine frame is of a cuboid frame structure, and the machine frame is installed on the base through a rotating shaft; the rotating shaft is provided with a ring-shaped stop groove and a gear; the hydraulic control system comprises a tilting cylinder and a rotating locking cylinder; the tilting cylinder is a gear and rack type swing oil cylinder, and the rack portion of the tilting cylinder is matched with the gear on the rotating shaft; the end of a piston rod of the rotating locking cylinder is matched with the stop groove in the rotating shaft. The machine frame can tilt by a certain angle and be locked relative to the base according to a certain rotating speed capable of being adjusted according to different process stages, and therefore the gravity casting machine conducting tilting motion and the tilting motion hydraulic control system of the gravity casting machine can solve the problems that in a casting process, molten metal filling is insufficient, mold exhaust is poor, and castings have air holes, interior quality of castings is improved, and the yield of castings is increased.
Description
Technical field
The present invention relates to the correlative technology field of metal casting machine, the Gravity casting machines of specifically a kind of action that can realize verting and driving realizes verting the hydraulic pressure control loop system of action.
Background technology
Gravitational casting refers to that molten metal pours into the process that metal mold cavity obtains foundry goods under terrestrial gravitation effect.Traditional fixed Gravity casting machines comprises base, the frame be fixedly installed on base, lathe bed (containing sound mould safety locking mechanism), open die closing mechanism, pull and push core mechanism, liftout attachment and hydraulic system and electric control unit up and down.Frame respect thereto is fixing, it is fixedly installed out die closing mechanism, the up and down part such as liftout attachment and mould mould bases.This kind of fixed Gravity casting machines, when casting intricate casting, exists that molten metal lack of fill, die venting are bad, foundry goods has the problems such as pore.
Summary of the invention
The invention provides a kind of can make frame respect thereto realize verting action Gravity casting machines and be wherein used for carrying out the hydraulic control system of drived control for action of verting.Because frame can be verted certain angle locking by respect thereto, so it can solve in casting process and have that molten metal lack of fill, die venting are bad, foundry goods has the problems such as pore, improve the yield rate of foundry goods interior quality and foundry goods.
The present invention solves the technical scheme that its technical problem takes:
There is a Gravity casting machines for action of verting, comprise base, open die closing mechanism, up and down liftout attachment, frame, electric control system and fluid power system, described in drive die closing mechanism, up and down liftout attachment and be fixed in described frame; Electric control system is connected with described fluid power system; Described frame is the frame structure of cuboid, and described frame is arranged on described base by rotating shaft; Described rotating shaft arranges the position-arresting groove of ring-type and gear is installed; Described fluid power system includes vert cylinder and rotational lock cylinder; The described cylinder that verts is the oscillating oil cylinder of pinion and-rack, described in the vert section of rack of cylinder cog with described rotating shaft and coordinate; The piston rod end of described rotational lock cylinder coordinates with the position-arresting groove in described rotating shaft.The described cylinder that verts promotes both sides piston movement by hydraulic coupling, and band carry-over bar moves left and right, and rack drives rotating shaft rotates.The manufacture of gear rack type swing oil cylinder is simple, and cost is low.
Hydraulic pump in described fluid power system is Variable plunger pump, and hydraulic medium is 46# antiwear hydraulic fluid.
Be provided with oil absorption filter at the inlet port of described hydraulic pump, the oil return line of hydraulic system is provided with return oil filter.When there is blocking in oil return filter core, machine by automatic alarm with reminding user cleaning or more renew cartridge.
At the oil-out of hydraulic pump, high-pressure filter is housed, guarantees that the hydraulic oil flowed in hydraulic system pipeline is more clean.
The oil return line of described fluid power system arranges water-cooled heat exchange unit, arranges oil temperature detecting element after described water-cooled heat exchange unit, described oil temperature detecting element is connected with described electric control system.When the temperature of hydraulic oil is higher than 55 DEG C, machine is by automatic alarm and show.
Described die closing mechanism, the up and down liftout attachment opened is fixed on the housing of described frame.
For the rotating part of described frame and base, drive the hydraulic control system of the action that realizes verting, comprise vert cylinder drive circuit and rotational lock cylinder drive circuit; The described entrance end verting cylinder drive circuit and rotational lock cylinder drive circuit is connected in parallel on main hydraulic circuit;
The described cylinder drive circuit that verts comprises magnetic valve YV9, stacked unidirectional throttle valve VS9, stacked unidirectional throttle valve VS10; Described magnetic valve YV9 is the solenoid directional control valve of two stations; The entrance end of described rotational lock cylinder drive circuit connects described magnetic valve YV9, and described magnetic valve YV9 connects the inlet and outlet of fuel channel of described rotational lock cylinder; Inlet and outlet of fuel channel between described magnetic valve YV9 and described rotational lock cylinder arranges described stacked unidirectional throttle valve VS9, stacked unidirectional throttle valve VS10 respectively, and is the connected mode of outlet throttling between two stacked unidirectional throttle valves and described rotational lock cylinder;
Described rotational lock cylinder drive circuit comprises the electromagnetic switch proportioning valve being connected with proportional amplifier, and proportional amplifier connects the encoder in electric control system; Described electromagnetic switch proportioning valve is divided into three stations, and intermediate stations is for closing station; The entrance end of the described cylinder drive circuit that verts connects makes described electromagnetic switch proportioning valve; Described electromagnetic switch proportioning valve two branch roads below arrange sequence valve respectively, and the oil circuit after two sequence valves be connected to respectively described in vert the entrance end of cylinder; Described sequence valve comprises pressure valve in parallel and check valve respectively, and corresponding pressure valve is contrary with the conducting direction of check valve.
The invention has the beneficial effects as follows: frame can respect thereto according to certain, the rotary speed that can regulate according to the different process stage, vert certain angle locking, so it can solve in casting process and have that molten metal lack of fill, die venting are bad, foundry goods has the problems such as pore, improve the yield rate of foundry goods interior quality and foundry goods.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of main frame of the present invention;
Fig. 2 is the side-looking structural representation of main frame of the present invention;
Fig. 3 is the status architecture schematic diagram that mid frame respect thereto of the present invention rotates;
Fig. 4 is the hydraulic scheme of rotation driving section of the present invention;
Fig. 5 is the overall structure figure of fluid power system of the present invention;
Fig. 6 is action flow chart of the present invention;
In figure: 1 base, 2 frames, 3 vert cylinder;
VP-pressure valve, SP-relay,
YV-magnetic valve, BY-Pressure gauge,
VS-choke valve, SQ-stroke=switch.
Detailed description of the invention
For ease of understanding technical scheme of the present invention, below in conjunction with accompanying drawing, wherein involved technology contents is described further.
As shown in Figure 1 to Figure 3, a kind of Gravity casting machines with action of verting, comprises base 1, opens die closing mechanism, up and down liftout attachment, frame 2, electric control system and fluid power system.Described die closing mechanism, the up and down liftout attachment opened is fixed in described frame 2.Electric control system is connected with described fluid power system.The frame structure of described frame 2 in cuboid, described frame 2 is arranged on described base 1 by rotating shaft; Described rotating shaft arranges the position-arresting groove of ring-type and gear is installed; Described fluid power system includes vert cylinder and rotational lock cylinder.The described cylinder 3 that verts is the oscillating oil cylinder of pinion and-rack, described in the vert section of rack of cylinder 3 cog with described rotating shaft and coordinate; The piston rod end of described rotational lock cylinder coordinates with the position-arresting groove in described rotating shaft, and piston rod is to consistent with the radial direction of rotating shaft.The described cylinder 3 that verts promotes both sides piston movement by hydraulic coupling, and band carry-over bar moves left and right, and rack drives rotating shaft rotates.When rotating shaft rotates to desired location by a certain speed, rotational lock cylinder piston rod end is stretched out in the position-arresting groove that is inserted in rotating shaft, position-arresting groove can for be arranged in rotating shaft circumferentially around mutually by two adjacent cannelures, rotational lock cylinder piston rod end now can be made to form an axially extended trapezoidal notch, and the big opening end of this trapezoidal notch is outside, rotating shaft is fixed by being embedded in the annular bead that formed between described two cannelures by this trapezoidal notch.Also can arrange half ring-like electromagnetism adhesive parts to coordinate with cannelure (i.e. position-arresting groove) in rotational lock cylinder piston rod end, certainly, cannelure (i.e. position-arresting groove) now can be single, also can arrange electromagnetic component for strengthening the suction-combining force in cannelure (i.e. position-arresting groove).The manufacture of gear rack type swing oil cylinder is simple, and cost is low.
Hydraulic pump in described fluid power system is the Variable plunger pump of Japanese YUKEN, and hydraulic medium is 46# antiwear hydraulic fluid.Fluid pressure line (flexible pipe and hard tube), pipe joint are EMB Products.Hydraulic Station is arrange separately, and layout is convenient, is easy to maintenance and repair.
Be provided with oil absorption filter at the inlet port of described hydraulic pump, the oil return line of hydraulic system is provided with return oil filter.When there is blocking in oil return filter core, machine by automatic alarm with reminding user cleaning or more renew cartridge.
At the oil-out of hydraulic pump, high-pressure filter is housed, guarantees that the hydraulic oil flowed in hydraulic system pipeline is more clean.
The oil return line of described fluid power system arranges water-cooled heat exchange unit, arranges oil temperature detecting element after described water-cooled heat exchange unit, described oil temperature detecting element is connected with described electric control system.When the temperature of hydraulic oil is higher than 55 DEG C, machine is by automatic alarm and show.
Described die closing mechanism, the up and down liftout attachment opened is fixed on the housing of described frame.
For the rotating part of described frame 2 with base 1, drive the hydraulic control system of the action that realizes verting, comprise vert cylinder drive circuit and rotational lock cylinder drive circuit; The described entrance end verting cylinder drive circuit and rotational lock cylinder drive circuit is connected in parallel on main hydraulic circuit.As shown in Figure 5, vert described in the connection separated left by main hydraulic circuit the hydraulic circuit of cylinder 3, rotational lock cylinder, in parallel point is set out plate locking cylinder respectively to the right, closing cylinder, dynamic die liftout cylinder, quiet mould follow out cylinder and cylinder-1 of loosing core for subsequent use, cylinder-2 etc. of loosing core for subsequent use hydraulic circuit.
The described cylinder drive circuit that verts comprises magnetic valve YV9, stacked unidirectional throttle valve VS9, stacked unidirectional throttle valve VS10; Described magnetic valve YV9 is the solenoid directional control valve of two stations; The entrance end of described rotational lock cylinder drive circuit connects described magnetic valve YV9, and described magnetic valve YV9 connects the inlet and outlet of fuel channel of described rotational lock cylinder; Inlet and outlet of fuel channel between described magnetic valve YV9 and described rotational lock cylinder arranges described stacked unidirectional throttle valve VS9, stacked unidirectional throttle valve VS10 respectively, and is the connected mode of outlet throttling between two stacked unidirectional throttle valves and described rotational lock cylinder.
Described rotational lock cylinder drive circuit comprises the electromagnetic switch proportioning valve being connected with proportional amplifier, and proportional amplifier connects the encoder in electric control system; Described electromagnetic switch proportioning valve is divided into three stations, and intermediate stations is for closing station; The entrance end of the described cylinder drive circuit that verts connects makes described electromagnetic switch proportioning valve; Described electromagnetic switch proportioning valve two branch roads below arrange sequence valve respectively, and the oil circuit after two sequence valves be connected to respectively described in vert the entrance end of cylinder; Described sequence valve comprises pressure valve VP4, VP5 in parallel and check valve respectively, and corresponding pressure valve VP4, VP5 are contrary with the conducting direction of check valve.
Adopting spiral swing hydranlic pressure jar and electromagnetic switch proportional valve control to vert the speed of verting of frame, making to operate steadily without impacting, easy to control, make the speed continuously adjustabe that verts.
Be illustrated in figure 6 motion flow of the present invention.
The setting of various parameter must set when shutting down, to determine to work the mischief when starting shooting.
During device power, first enter the man-machine main screen of electric control system end, then carry out the selection of each screen according to the Chinese character explanation of often to shield button below." upper page " refers to get back to page, and " nextpage " refers to get back to nextpage, and " returning " refers to back key frame, i.e. man-machine interface.
At system main screen picture, display device status switch position, running status, production counting etc.
Produce counting and can press the clearing of counting reset button at any time, total output can not reset.
Vert setting parameter: under main screen, press the setting button that verts, enter the setting screen that verts, when this picture can set crawl updip, have a down dip electromagnetic switch proportioning valve output speed, Speed Setting will press the percent value setting of the maximum output of electromagnetic switch proportioning valve, be 100 to the maximum, minimum is 0, selects the suitable speed hourly velocity that makes to vert not too big.Vert termination point at this set angle scope 0-105 degree.
Updip, have a down dip Speed Setting: tilt angled down, from 0 degree, only verts termination point to maximum.Updip angle has the maximum termination point that verts to start to stop to erecting angle 0.The speed set-point curves that verts can be divided into seven grades six sections, the integer of angle input numerical value 0-105 degree, speed input range 0-100.After setting of verting completes, can carry out having a down dip under manual mode, the motion test of updip, can run automatically until meet the requirements of the speed of verting.
Action is arranged: in default, press action arrange button, enter action setting screen, can select with or without front mould, rear mold; With or without patrix; With or without counterdie; Counterdie head part ejects or counterdie follows pushing method; Matched moulds order after lock pin or first lock pin after first matched moulds.
Actuation time sets: in default, press set of time button, entry time setting screen.
(1) setting counterdie is followed and is ejected delay time.
(2) set counterdie head part and eject delay time.
(3) the patrix delayed goring time.
(4) touch on and eject delay time.
(5) mould remaining time is set: mould remaining time, from being poured, presses cooling or both hands button starts timing, chronomere second.
Cooling controls: under main screen, press cooling control button, enter cooling control interface; Arrange cooling control mode at this picture, carry out cooling manual automated manner and select, when selecting cooling automatic, auto-programming can start cooling program automatically when running to cooling step.Cooling control interface press cooling parameter setting button, enter cooling parameter setting screen, select cooling duct with or without; To should the cooling duct time started, turn-on time; Time started starts from cooling and starts timing time to time when beginning to cool down connection, terminates turn-on time to cool, until automatically cool beginning next time to this cooling duct.Cooling testing button can be pressed at cooling picture to enter and coldly go test pictures, carry out cooling and test.
To machine energising, primer fluid press pump according to the following steps:
(1) open all pressure meter switches, now each Pressure gauge index should be " 0 ";
(2) unclamp the regulating handle of pressure valve VP1, VP3;
(3) within 1 second, carry out the operation of " primer fluid press pump " and " hydraulic pump stopping ", check whether the rotation direction of hydraulic pump meets the direction of arrow of hydraulic pump demarcation, should change electrical wiring, and then try if be not inconsistent simultaneously.After determining that hydraulic pump rotation direction is errorless, primer fluid press pump makes it operate continuously, prepare set pressure (not used time for a long time, apply hand rotary electric machine blade and lubricate pin to drive hydraulic pump to operate before energising, anti-sliding stop is bad draws bad high pressure pin);
The setting of hydraulic system pressure, as shown in Figure 4, Figure 5:
(1) the handle of the first own pressure valve VP1 of regulator solution press pump, what need not revolve is too tight, next can be slowly tight.Because system is energized, now magnetic valve YV1 obtains electric, slowly screws the handle of pressure valve VP3, makes Pressure gauge BY1 point to 10MPa; If the pressure of VP3 is lower than VP1, two knobs can cooperatively interact, make VP3 a little more than VP1, until Pressure gauge display 10Mpa, then VP1 is unclamped and slowly screw again, observe the situation of change of BY1, make it to be stabilized on 10Mpa, now high-pressure mixes up, the locking nut of locking VP1, cover upper cover.
(2) pressure is placed in locations of high pressure, continues the handle regulating pressure valve VP1 and VP3, makes Pressure gauge BY1 point to 13MPa; Regulate the handle of pressure valve VP1 again, make Pressure gauge BY1 point to 13MPa always; Slowly unscrewed by VP3, observing the situation of change of BY1, should be unclamping along with VP3 again, and the value of BY1 in decline, more slowly screws VP3 and is 13Mpa to pressure and makes it stable, and lock VP3, now safety overflow pressure is 13Mpa; Come up the knob of VP1, and when making the index of BY1 be 10MPa, by the handle locking of VP1, system high pressure pressure regulates complete, and the oil pressure relief of safety overflow valve is also set up simultaneously.
The adjustment of folding type speed:
This control valve group is positioned on the entablature of machine lathe bed.VS1 adjusts open form speed, and VS2 adjusts mould assembly speed.State of runtime machine is placed in manually (or crawl) position, that carries out this closing cylinder respectively opens mould assembling action, in folding type reciprocatory movement, observe the speed of service of closing cylinder each time, adjust VS1, VS2 respectively, be screwed into (anti-silk), then speed reduces, then speed of back-outing raises, until reach ideal value.
Eject the adjustment of speed up and down:
This control valve group is positioned on the entablature of machine lathe bed equally.The advance and retreat speed of liftout tank in VS3, VS4 adjustment, the advance and retreat speed of the lower liftout tank of VS5, VS6 adjustment.State of runtime machine is placed in manual position, carry out respectively two liftout tanks eject and reverse work in top, in reciprocatory movement, observe the speed of service of each cylinder, adjust VS3, VS4, VS5, VS6 respectively, be screwed into (positive silk), then speed reduces, then speed of back-outing raises, until reach ideal value.
The adjustment of dynamic model locking cylinder speed
VS7, VS8 are used to the turnover speed adjusting this oil cylinder, as a same reason, are screwed into (positive silk), then speed reduces, and then speed of back-outing raises, until reach ideal value.
The adjustment pulling and pushing core 1 and 2 for subsequent use
This control valve group is positioned at the top of machine lathe bed crossbeam, VS11, VS12, VS13, VS14 be used for adjusting pull and push core speed (this machine only stays valve group interface for pulling and pushing core, pull and push core mechanism, oil cylinder, signalling component user according to part need configure on mould).After loading onto oil cylinder, Principles of Regulation are the same.
The adjustment of upset locking cylinder speed
This group valve is positioned at the rear side of base support leg, VS9 and VS10 adjusts the turnover speed of this locking cylinder, as a same reason, is screwed into (positive silk), then speed reduces, and then speed of back-outing raises, until reach ideal value.
The setting of speed of verting
Updip and the speed had a down dip are jointly controlled by shown electromagnetic switch proportioning valve and rotary encoder, it is input to proportional amplifier BYV1 and BYV2 by inputting the different signals of telecommunication, and the change location of various speed is determined by encoder, namely different control variables is inputted in different angles, thus reach different speed of verting, realize speed change of verting and fill type.Under electromagnetic switch proportioning valve, superpose two groups of sequence valves, it is used to control to vert oil cylinder back pressure, to ensure the stationarity of the process of verting when exceeding center of gravity.Twist as then back pressure is large, when producing, under ensureing the prerequisite operated steadily, back pressure is the smaller the better, and such driving pressure can reduce.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Except the technical characteristic described in description, be the known technology of those skilled in the art.
Claims (7)
1. there is a Gravity casting machines for action of verting, comprise base, open die closing mechanism, up and down liftout attachment, frame, electric control system and fluid power system, described in drive die closing mechanism, up and down liftout attachment and be fixed in described frame; Electric control system is connected with described fluid power system, it is characterized in that: described frame is the frame structure of cuboid, and described frame is arranged on described base by rotating shaft; Described rotating shaft arranges the position-arresting groove of ring-type and gear is installed; Described fluid power system includes vert cylinder and rotational lock cylinder; The described cylinder that verts is the oscillating oil cylinder of pinion and-rack, described in the vert section of rack of cylinder cog with described rotating shaft and coordinate; The piston rod end of described rotational lock cylinder coordinates with the position-arresting groove in described rotating shaft.
2. the Gravity casting machines with action of verting according to claim 1, is characterized in that: the hydraulic pump in described fluid power system is Variable plunger pump, and hydraulic medium is 46# antiwear hydraulic fluid.
3. the Gravity casting machines with action of verting according to claim 1 and 2, is characterized in that: be provided with oil absorption filter at the inlet port of described hydraulic pump, the oil return line of hydraulic system is provided with return oil filter.
4. the Gravity casting machines with action of verting according to claim 3, is characterized in that: at the oil-out of hydraulic pump, high-pressure filter is housed.
5. the Gravity casting machines with action of verting according to claim 1 and 2, it is characterized in that: water-cooled heat exchange unit is set on the oil return line of described fluid power system, arrange oil temperature detecting element after described water-cooled heat exchange unit, described oil temperature detecting element is connected with described electric control system.
6. the Gravity casting machines with action of verting according to claim 1 and 2, is characterized in that: described in drive die closing mechanism, up and down liftout attachment and be fixed on the housing of described frame.
7. vert for having described in claim 1 to 6 Gravity casting machines of action, drives the hydraulic control system of its action that realizes verting, it is characterized in that:
Comprise vert cylinder drive circuit and rotational lock cylinder drive circuit; The described entrance end verting cylinder drive circuit and rotational lock cylinder drive circuit is connected in parallel on main hydraulic circuit;
The described cylinder drive circuit that verts comprises magnetic valve YV9, stacked unidirectional throttle valve VS9, stacked unidirectional throttle valve VS10; Described magnetic valve YV9 is the solenoid directional control valve of two stations; The entrance end of described rotational lock cylinder drive circuit connects described magnetic valve YV9, and described magnetic valve YV9 connects the inlet and outlet of fuel channel of described rotational lock cylinder; Inlet and outlet of fuel channel between described magnetic valve YV9 and described rotational lock cylinder arranges described stacked unidirectional throttle valve VS9, stacked unidirectional throttle valve VS10 respectively, and is the connected mode of outlet throttling between two stacked unidirectional throttle valves and described rotational lock cylinder;
Described rotational lock cylinder drive circuit comprises the electromagnetic switch proportioning valve being connected with proportional amplifier, and proportional amplifier connects the encoder in electric control system; Described electromagnetic switch proportioning valve is divided into three stations, and intermediate stations is for closing station; The entrance end of the described cylinder drive circuit that verts connects makes described electromagnetic switch proportioning valve; Described electromagnetic switch proportioning valve two branch roads below arrange sequence valve respectively, and the oil circuit after two sequence valves be connected to respectively described in vert the entrance end of cylinder; Described sequence valve comprises pressure valve in parallel and check valve respectively, and corresponding pressure valve is contrary with the conducting direction of check valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410796372.XA CN104588625B (en) | 2014-12-18 | 2014-12-18 | There is Gravity casting machines and the action hydraulic control system of verting thereof of the action of verting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410796372.XA CN104588625B (en) | 2014-12-18 | 2014-12-18 | There is Gravity casting machines and the action hydraulic control system of verting thereof of the action of verting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107160155A (en) * | 2017-07-27 | 2017-09-15 | 铜陵科达车辆装备有限责任公司 | Portable microcomputer controls rolling bearing pressing machine |
| CN109058751A (en) * | 2018-10-12 | 2018-12-21 | 西安昊池环保工程有限公司 | Wind power generating set lubricating oil refined filtration case and filtration system |
| CN109570479A (en) * | 2018-12-24 | 2019-04-05 | 常州卡斯特铝精密铸造科技有限公司 | Oil sump casting machine |
| CN113404735A (en) * | 2021-06-22 | 2021-09-17 | 中煤科工集团重庆研究院有限公司 | Load-sensitive hydraulic system for adjusting inclination angle of drilling machine and working method of load-sensitive hydraulic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113404735A (en) * | 2021-06-22 | 2021-09-17 | 中煤科工集团重庆研究院有限公司 | Load-sensitive hydraulic system for adjusting inclination angle of drilling machine and working method of load-sensitive hydraulic system |
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| CN104588625B (en) | 2016-05-18 |
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