CN102815633B - Control device for hydraulic winch and engineering machine - Google Patents
Control device for hydraulic winch and engineering machine Download PDFInfo
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- CN102815633B CN102815633B CN201210322270.5A CN201210322270A CN102815633B CN 102815633 B CN102815633 B CN 102815633B CN 201210322270 A CN201210322270 A CN 201210322270A CN 102815633 B CN102815633 B CN 102815633B
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Abstract
The invention provides a control device for a hydraulic winch and an engineering machine. The control device comprises a motor, a back pressure valve and a flow regulation valve, wherein the motor is connected with the hydraulic winch, and comprises a loading cavity and a descending cavity; and the loading cavity is connected with the back pressure valve, the flow regulation valve and an oil tank sequentially. According to the control device, the flow regulation valve is used for regulating the flow of hydraulic oil discharged from the loading cavity of the motor, so that the control on a descending speed is realized, the speed of slow descending is controlled stably, and the control is more stable and reliable.
Description
Technical field
The present invention relates to Hydraulic Field, more specifically, relate to a kind of control setup and construction machinery and equipment of hydraulic wireline winch.
Background technology
Vertical earthwork evacuation construction (such as creep into downwards from earth's surface, driving etc.) needs the speed of creeping into/tunneling, creep into/and the pressure at headwork device (i.e. load) end over the ground controlled.When creeping into/and headwork device is when being suspended in midair by hydraulic wireline winch, and the Stress control at the speed of creeping into/tunneling, creep into/headwork device end over the ground can be achieved by the towing tension of putting on rope speed (i.e. descending speed) and rope of hydraulic control winch.
Fig. 1 shows the hydraulic schematic diagram of the control setup of a kind of hydraulic wireline winch of the prior art.As shown in Figure 1, the reel of hydraulic wireline winch 40 is connected with motor 10 by reductor 110, and motor 10 comprises load cavity 11 and decline chamber 12, and motor 10 is connected with pressure oil-source 140 with change-over valve 130 by load balance valve 120 successively.Wherein, load balance valve 120 comprises valve 121.
When needs load hoists, the valve 121 of load balance valve 120 is positioned at left station, and now, the pressure oil that change-over valve 130 makes pressure oil-source 140 export is through the load cavity of the check valve inflow motor 10 of the left station of valve 121, thus the function that realization hoists.When needs load declines, the valve 121 of load balance valve 120 is positioned at right working position, and now, the pressure oil that change-over valve 130 makes pressure oil-source 140 export enters the decline chamber 12 of motor 10, and meanwhile, the valve 121 of load balance valve 120 is operated in right working position.Now, valve 121 is in throttle, and the high pressure oil from load cavity 11 is discharged.If the excessive velocities declined so that the traffic demand of motor 10 have exceeded the delivery quality in decline chamber 12, so decline chamber 12 is empty by suction, so the valve 121 of load balance valve 120 becomes left station from right working position under the action of the spring, to reduce the release rate of the high pressure oil of load cavity 11, thus realize mating and the force balance of load of descending speed and supply flow rate.That is, the rope of putting at a slow speed of hydraulic wireline winch of the prior art is supplied to the hydraulic fluid flow rate realization of motor by reduction.
Because the velocity magnitude of putting rope is that hydraulic fluid flow rate by adjusting supply motor realizes, the hydraulic fluid flow rate itself being only supplied to motor is stablized guarantee and is put stablizing of rope speed.But generally realized with coordinating of valve by oil pump the control of hydraulic fluid flow rate in prior art, the stability of its flow is not high.The HM Hydraulic Motor of hydraulic wireline winch of the prior art and reductor are for realizing fast lifting, decline and designing, and when for putting at a slow speed rope, the rotating speed of motor is extremely slow, and rotating speed is difficult to stability contorting.Especially, put the stable of rope speed also to be realized by the local closed loop controlled reset of load balance valve.When putting at a slow speed rope, the performance extreme difference of local closed loop controlled reset, easily produces and control shake, thus the stability of rope speed is put in impact.
Further ,/size adjustment the function of the power of contacting to earth of headwork device and to prevent the rope on hydraulic wireline winch from crossing playing function be realized by the warp of hydraulic wireline winch is crept into.Adopt the operation mode of the initiatively fuel feeding to decline chamber owing to putting rope, therefore, HM Hydraulic Motor by forward transfer be switched to warp time, need complicated electric, hydraulic structure to realize.
Summary of the invention
The present invention aims to provide a kind of control setup and rig of hydraulic wireline winch, to solve in prior art the problem of putting at a slow speed rope hourly velocity instability.
For solving the problems of the technologies described above, according to a first aspect of the invention, provide a kind of control setup of hydraulic wireline winch, control setup comprises motor, back pressure valve and flow control valve; Motor is connected with hydraulic wireline winch, and motor comprises load cavity and decline chamber; Load cavity is connected with back pressure valve, flow control valve and fuel tank successively.
Further, control setup also comprises the first repairing portion, and the first repairing portion comprises pressure source and check valve, and pressure source is connected with load cavity by check valve.
Further, pressure source is oil pump or energy storage.
Further, the first repairing portion also comprises the first by pass valve for setting oil compensation pressure.
Further, control setup also comprises the empty feed circuit of anti-suction be connected with decline chamber, and the empty feed circuit of anti-suction comprises the second by pass valve for setting the empty oil compensation pressure of anti-suction.
Further, control setup also comprises controller, is connected with back pressure valve and flow control valve, for the aperture of the back pressure and flow control valve that control back pressure valve.
Further, control setup also comprises the drg for hydraulic control winch, control setup also comprises the brake releasing unit for control brake, brake releasing unit comprises reducing valve and the first change-over valve, load cavity is connected with drg with the first change-over valve by reducing valve successively, control setup also comprises the pressure detecting element of the pressure for detecting load cavity, pressure detecting element is connected with controller, the commutation of Stress control first change-over valve that controller detects according to pressure detecting element.
Further, brake releasing unit also comprises the second change-over valve, and reducing valve is connected with the first change-over valve by the second change-over valve.
Further, flow control valve is flow regulating valve, flow valve or load balance valve.
Further, back pressure valve is by pass valve or sequence valve.
Further, back pressure valve is that internal control leaks by pass valve or to leak sequence valve for internal control.
According to a second aspect of the invention, provide a kind of construction machinery and equipment, comprise hydraulic wireline winch, drilling tool and the control setup for hydraulic control winch, drilling tool is connected with hydraulic wireline winch, and this control setup is above-mentioned control setup.
Further, the motor of control setup is connected with hydraulic wireline winch by reductor, reductor is dual input reductor, and one end of dual input reductor is connected with the motor of control setup, and the other end is connected with pressure oil-source by another motor, load balance valve, change-over valve successively.
Further, construction machinery and equipment is rig or slotter.
The flow of the hydraulic oil that the load cavity that the control setup in the present invention carrys out governor motor by its flow control valve is discharged, thus achieve the control to descending speed, make the speed of descending at slow speed obtain stable control, more stable, reliable in control.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 diagrammatically illustrates the hydraulic schematic diagram of the control setup of a kind of hydraulic wireline winch of the prior art;
Fig. 2 diagrammatically illustrates the hydraulic schematic diagram of the control setup in an embodiment in the present invention; And
Fig. 3 diagrammatically illustrates the hydraulic schematic diagram of the control setup in another embodiment in the present invention.
Reference numeral in figure: 10, motor; 10, motor '; 11, load cavity; 11 ', load cavity; 12, decline chamber; 12 ', decline chamber; 20, back pressure valve; 30, flow control valve; 40, hydraulic wireline winch; 50, fuel tank; 60, the first repairing portion; 61, pressure source; 62, check valve; 63, the first by pass valve; 70, the empty feed circuit of anti-suction; 71, the second by pass valve; 80, controller; 90, drg; 101, reducing valve; 102, the first change-over valve; 103, pressure detecting element; 104, the second change-over valve; 110, reductor; 120, load balance valve; 121, valve; 130, change-over valve; 140, pressure oil-source.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
As a first aspect of the present invention, provide a kind of control setup of hydraulic wireline winch.As shown in Figures 2 and 3, this control setup comprises motor 10, back pressure valve 20 and flow control valve 30; Motor 10 is connected with hydraulic wireline winch 40, and motor 10 comprises load cavity 11 and decline chamber 12; Load cavity 11 is connected with back pressure valve 20, flow control valve 30 and fuel tank 50 successively.Preferably, motor 10 is connected with the reel of hydraulic wireline winch 40 by reductor 110, therefore, is needing the occasion of descending at slow speed, uses the reductor that reduction ratio is larger, more easily realizes descending at slow speed.
Motor 10 drives the spool turns of hydraulic wireline winch 40, thus load equipments such as () such as drilling tools is promoted or decline.Especially, realize putting rope at a slow speed by the speeds control of the reel to hydraulic wireline winch 40, when putting at a slow speed rope, there is stable speed with control load, and control the towing tension size to load accordingly, with the size of the power of contacting to earth of control load.
Incorporated by reference to Fig. 2 and Fig. 3, because back pressure valve 20 and flow control valve 30 are connected in series with the load cavity 11 of motor 10, the hydraulic oil flowed out by load cavity 11 flows through back pressure valve 20 and flow control valve 30 successively, and then flows back to fuel tank 50.During this period, the decline potential energy that discharges of load is also converted into heat energy by back pressure valve 20 and flow control valve 30 simultaneously.
Wherein, back pressure valve 20 can be used for setting towing tension size suffered when load declines (for equipments such as drilling tools, the control of the power of contacting to earth to equipment can be realized), preferably, back pressure valve 20 is by pass valve or sequence valve, further, back pressure valve 20 to leak by pass valve or to leak sequence valve for internal control for internal control.Adopt the back pressure valve of these forms, the pressure oil flowed out by load cavity 11 can be made almost unhindered through back pressure valve, prevent back pressure valve from producing interference to the flow control valve 30 in its downstream.Like this, creep into/size adjustment of the power of contacting to earth of headwork device just can be realized by back pressure valve 20, do not need to resemble to be realized by the warp of hydraulic wireline winch in the prior art, do not need complicated electric, hydraulic structure.
Namely flow control valve 30, for setting the speed of the oil extraction of the load cavity 11 of motor 10, also sets the descending speed of load, and preferably, flow control valve 30 is flow regulating valve, flow valve or load balance valve.
Like this, only have when the pressure of the load cavity 11 of motor 10 reaches the setting value of back pressure valve 20, the pressure oil of load cavity 11 just allows to flow to flow control valve 30 through back pressure valve 20.When pressure oil flows through flow control valve 30, flow is larger, resistance is larger, thus the maximum falling speed of load is limited.Preferably, flow control valve 30 can be proportional directional valve, obtains controlling more accurately to make the descending speed of load.
Visible, because back pressure valve 20 and flow control valve 30 are in series arranged successively, first ensure that the pressure of the load cavity of motor 10, namely ensure that the towing tension acted on rope.Due to the key parameter that towing tension is the squareness ensureing to creep into/tunnel, the cutter protected on equipment, transmission gearbox; therefore; to effective control of towing tension, the squareness of creeping into/tunneling can be improved, the cutter on prolongation equipment and the service life of transmission gearbox.
The flow of the hydraulic oil that the load cavity 11 that the control setup in the present invention carrys out governor motor 10 by its flow control valve 30 is discharged, thus the control achieved descending speed, the speed of descending at slow speed is made to obtain stable control, more stable, reliable in control.
In order to prevent internal leakage, control setup also comprises the first repairing portion 60 of repairing portion 60, first and comprises pressure source 61 and check valve 62, and pressure source 61 is connected with load cavity 11 by check valve 62.Like this, when there occurs internal leakage, by pressure source 61 through check valve 62 to load cavity 11 replenisher force feed.Preferably, pressure source 61 is oil pump or energy storage, and certainly, pressure source 61 also can be the pressure source of other form.
Especially, the first repairing portion 60 also comprises the first by pass valve 63 for setting oil compensation pressure, and preferably, the first by pass valve 63 is vent relief valves.Check valve 62 can prevent the pressure oil of load cavity 11 from being leaked by the first by pass valve 63.Preferably, the setting pressure of the first by pass valve 63 is equal with the setting pressure of back pressure valve 20 or close.Owing to have employed the first by pass valve 63, when adopting oil pump etc. as pressure source 61, can prevent from filling into too high pressure oil in load cavity 11.When adopting energy storage as pressure source 61, use first by pass valve 63 can not be needed.
In order to prevent the decline chamber 12 of motor 10 from inhaling sky, control setup also comprises the empty feed circuit 70 of the anti-suction be connected with decline chamber 12, and such as, the empty feed circuit of anti-suction 70 can be connected with any pressure oil-source.Preferably, the empty feed circuit of anti-suction 70 comprises the second by pass valve 71 for setting the empty oil compensation pressure of anti-suction, to prevent the hydraulic oil filling into hypertonia.
Please refer to Fig. 2 and Fig. 3, preferably, control setup also comprises controller 80, is connected with back pressure valve 20 and flow control valve 30, for the aperture of the back pressure and flow control valve 30 that control back pressure valve 20.The pressure set points of back pressure valve 20 can be set and adjust by controller 80, to realize the adjustment to towing tension; Simultaneously can also the aperture of adjust flux control cock 30, to realize the adjustment to descending speed.Preferably, back pressure valve is now electricity liquid ratio relief valve or electric-hydraulic proportion sequence valve, further, can be that internal control leaks the electricity liquid ratio relief valve of formula or electric-hydraulic proportion sequence valve.Preferably, flow control valve 30 can be electro-hydraulic proportional flow valve.Such as, operating personal can regulate the size of back pressure and the speed of decline according to the situation on stratum, such as, need larger back pressure when stratum is softer, can be set by the aperture of input media (such as knob etc.) to the pressure set points of back pressure valve 20 and flow control valve 30.Then, controller 80 obtains the related setting value of operating personal, and is detected in real time back pressure by the size of pressure detecting element 103 simultaneously.Like this, the aperture of pressure feedback value to the pressure set points of back pressure valve 20 and flow control valve 30 just detected by pressure detecting element 103 sets and adjusts, with the value making back pressure reach predetermined.That is, the pressure feedback value of pressure detecting element 103 is utilized can to realize the closed loop control of towing tension (i.e. back pressure).In addition, the pressure feedback value of pressure detecting element 103 also can be utilized to carry out trouble diagnosing.Such as, when there is booster fault, pressure detecting element 103 can't detect pressure all the time, in any case and regulate back pressure valve 20 and flow control valve 30, also can not set up pressure, now can judge booster fault occurs.When the spool of back pressure valve 20 blocks, detect that pressure raises by pressure detecting element 103, in any case but regulate back pressure valve 20, pressure can not be made to reduce, now can judge back pressure valve 20 et out of order.
In one embodiment, as shown in Figures 2 and 3, control setup also comprises the drg 90 for hydraulic control winch 40, control setup also comprises the brake releasing unit for control brake 90, brake releasing unit comprises reducing valve 101 and the first change-over valve 102, load cavity 11 is connected with drg 90 with the first change-over valve 102 by reducing valve 101 successively, control setup also comprises the pressure detecting element 103 of the pressure for detecting load cavity 11, pressure detecting element 103 is connected with controller 80, the commutation of Stress control first change-over valve 102 that controller 80 detects according to pressure detecting element 103.Like this, pressure detecting element 103 can be utilized to detect the pressure of load cavity 11, as long as after the pressure of load cavity 11 reaches predetermined value, controller 80 just can control the first change-over valve 102 and commutate (such as, first change-over valve 102 is positioned at right working position), allowing reel to start to rotate in order to being used for controlling brake releasing unit from the pressure oil of load cavity 11, preventing from, when non-build-up pressure, just starting reel.
Preferably, brake releasing unit also comprises the second change-over valve 104, and reducing valve 101 is connected with the first change-over valve 102 by the second change-over valve 104.Second change-over valve 104 commutates under the pressure oil effect exported by reducing valve 101, serves the effect of time delay.Like this, when load cavity 11 build-up pressure, can again through the time delay of the second change-over valve 104, thus further ensure brake releasing unit at correct opportunity (namely completely build-up pressure) permission spool turns, improve the reliability of system.
In the embodiment shown in fig. 3, reductor 110 can adopt the reductor of dual input.This reductor has two kinds of reduction ratios and two motor incoming ends, and one of them motor incoming end may be used for fast lifting and decline, and another motor incoming end can be used for hoisting at a slow speed and declining.Especially, at one time, only allow to use one of them motor, must reliable braking by the drg of the one end of motor used.Due to the function that whole control setup possesses at a slow speed and declines fast simultaneously, therefore, speed that can be different according to different operating mode choice for uses, both improve work efficiency, in turn ensure that stability during microinching.
As shown in Figure 3, the reel of hydraulic wireline winch 40 is connected with two motors 10 and 10 ' by the reductor 110 of dual input.Compared with Fig. 2, Fig. 3 adds the part on the right side of hydraulic wireline winch 40, to realize the function declined fast.Motor 10 ' comprises load cavity 11 ' and decline chamber 12 ', and motor 10 ' is connected with pressure oil-source 140 with change-over valve 130 by load balance valve 120 successively.Wherein, load balance valve 120 comprises valve 121.
When needs load hoists, the valve 121 of load balance valve 120 is positioned at left station, and now, the pressure oil that change-over valve 130 makes pressure oil-source 140 export is through the load cavity 11 ' of the check valve inflow motor 10 of the left station of valve 121, thus the function that realization hoists.When needs load declines, the valve 121 of load balance valve 120 is positioned at right working position, and now, the pressure oil that change-over valve 130 makes pressure oil-source 140 export enters the decline chamber 12 ' of motor 10 ', and meanwhile, the valve 121 of load balance valve 120 is operated in right working position.Now, valve 121 is in throttle, and the high pressure oil from load cavity 11 ' is discharged.If the excessive velocities declined so that the traffic demand of motor 10 ' have exceeded the delivery quality in decline chamber, so sky is inhaled in decline chamber, so the valve 121 of load balance valve 120 becomes left station from right working position under the action of the spring, to reduce the release rate of the high pressure oil of load cavity, thus realize mating and the force balance of load of descending speed and supply flow rate.
As a second aspect of the present invention, provide a kind of construction machinery and equipment, comprise hydraulic wireline winch, drilling tool and the control setup for hydraulic control winch, drilling tool is connected with hydraulic wireline winch, and this control setup is above-mentioned control setup.Preferably, this project machinery can be rig or slotter etc.
Preferably, the motor 10 of control setup is connected with hydraulic wireline winch by reductor 110, and reductor 110 is single input reductors, to realize the function of descending at slow speed.
The motor 10 of control setup is connected with hydraulic wireline winch by reductor 110, reductor 110 is dual input reductors, one end of dual input reductor is connected with the motor 10 of control setup, and the other end is connected with pressure oil-source 140 by another motor 10 ', load balance valve 120, change-over valve 130 successively.Like this, just can realize function that is quick and descending at slow speed simultaneously.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a control setup for hydraulic wireline winch, is characterized in that, described control setup comprises motor (10), back pressure valve (20) and flow control valve (30); Described motor (10) is connected with described hydraulic wireline winch (40), and described motor (10) comprises load cavity (11) and decline chamber (12); Described load cavity (11) is connected with described back pressure valve (20), described flow control valve (30) and fuel tank (50) successively, described back pressure valve (20) is for setting towing tension size suffered when load declines, and described flow control valve (30) is for setting the speed of the oil extraction of described load cavity (11).
2. control setup according to claim 1, it is characterized in that, described control setup also comprises the first repairing portion (60), described first repairing portion (60) comprises pressure source (61) and check valve (62), and described pressure source (61) is connected with described load cavity (11) by described check valve (62).
3. control setup according to claim 2, is characterized in that, described pressure source (61) is oil pump or energy storage.
4. control setup according to claim 2, is characterized in that, described first repairing portion (60) also comprises the first by pass valve (63) for setting oil compensation pressure.
5. control setup according to any one of claim 1 to 4, it is characterized in that, described control setup also comprises the empty feed circuit of anti-suction (70) be connected with described decline chamber (12), and the empty feed circuit of described anti-suction (70) comprises the second by pass valve (71) for setting the empty oil compensation pressure of anti-suction.
6. control setup according to any one of claim 1 to 4, it is characterized in that, described control setup also comprises controller (80), be connected with described back pressure valve (20) and described flow control valve (30), for the aperture of the back pressure and described flow control valve (30) that control described back pressure valve (20).
7. control setup according to claim 6, it is characterized in that, described control setup also comprises the drg (90) for controlling described hydraulic wireline winch (40), described control setup also comprises the brake releasing unit for controlling described drg (90), described brake releasing unit comprises reducing valve (101) and the first change-over valve (102), described load cavity (11) is connected with described drg (90) with described first change-over valve (102) by described reducing valve (101) successively, described control setup also comprises the pressure detecting element (103) of the pressure for detecting described load cavity (11), described pressure detecting element (103) is connected with described controller (80), the commutation of the first change-over valve (102) described in the Stress control that described controller (80) detects according to described pressure detecting element (103).
8. control setup according to claim 7, it is characterized in that, described brake releasing unit also comprises the second change-over valve (104), and described reducing valve (101) is connected with described first change-over valve (102) by described second change-over valve (104).
9. control setup according to any one of claim 1 to 4, is characterized in that, described flow control valve (30) is flow regulating valve, flow valve or load balance valve.
10. control setup according to any one of claim 1 to 4, is characterized in that, described back pressure valve (20) is by pass valve or sequence valve.
11. control setups according to any one of claim 1 to 4, is characterized in that, described back pressure valve (20) to leak by pass valve or to leak sequence valve for internal control for internal control.
12. 1 kinds of construction machinery and equipments, comprise hydraulic wireline winch, drilling tool and the control setup for controlling described hydraulic wireline winch, described drilling tool is connected with described hydraulic wireline winch, it is characterized in that, described control setup is the control setup according to any one of claim 1 to 11.
13. construction machinery and equipments according to claim 12, it is characterized in that, the motor (10) of described control setup is connected with described hydraulic wireline winch by reductor (110), described reductor (110) is dual input reductor, one end of described dual input reductor is connected with the motor (10) of described control setup, and the other end is connected with pressure oil-source (140) by another motor (10 '), load balance valve (120), change-over valve (130) successively.
14. construction machinery and equipments according to claim 12, is characterized in that, described construction machinery and equipment is rig or slotter.
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| CN201210322270.5A CN102815633B (en) | 2012-09-03 | 2012-09-03 | Control device for hydraulic winch and engineering machine |
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| CN201210322270.5A CN102815633B (en) | 2012-09-03 | 2012-09-03 | Control device for hydraulic winch and engineering machine |
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| CN102815633A CN102815633A (en) | 2012-12-12 |
| CN102815633B true CN102815633B (en) | 2015-04-22 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103466482B (en) * | 2013-09-22 | 2016-02-24 | 徐州重型机械有限公司 | A kind of hoist and hoisting hydraulic system thereof |
| CN103527536B (en) * | 2013-10-22 | 2016-08-17 | 中联重科股份有限公司 | Hydraulic motor governing system and speed regulating method, crane gear |
| CN103613030B (en) * | 2013-11-26 | 2016-08-24 | 中联重科股份有限公司 | Repairing control method, device, system and the crane of hoisting mechanism hydraulic system |
| CN104391516B (en) * | 2014-10-17 | 2017-06-20 | 华中科技大学 | The method for control speed and system of the underwater moving body of hydraulic wireline winch flexible drawing |
| CN105443475B (en) * | 2015-12-30 | 2017-10-27 | 中国铁建重工集团有限公司 | Load pressure Self Adaptive Control hydraulic system, control method and pre-cut scouring machine |
| CN109231051B (en) * | 2018-09-29 | 2020-06-05 | 武汉船用机械有限责任公司 | Safety self-locking and remote emergency hydraulic system for high-position winch and operation method of safety self-locking and remote emergency hydraulic system |
| CN111924739B (en) * | 2020-07-03 | 2022-05-27 | 中国船舶重工集团公司第七0四研究所 | Multifunctional lifting winch for recovery operation of manned submersible |
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| FR2237504A5 (en) * | 1973-06-29 | 1975-02-07 | Inst Francais Du Petrole | Control system for drill column drive - uses two hydraulic motors and pumps with common valve |
| US6012707A (en) * | 1995-05-19 | 2000-01-11 | Tamrock Oy | Arrangement for controlling tension in a winch cable connected to rock drilling equipment |
| CN2509165Y (en) * | 2001-11-19 | 2002-09-04 | 辛文阁 | Hydraulic lifting mechanism |
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| CN102815633A (en) | 2012-12-12 |
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