CN107620746B - Control system and control method for instant lifting of back dragging force of horizontal directional drilling machine - Google Patents
Control system and control method for instant lifting of back dragging force of horizontal directional drilling machine Download PDFInfo
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- CN107620746B CN107620746B CN201711017172.XA CN201711017172A CN107620746B CN 107620746 B CN107620746 B CN 107620746B CN 201711017172 A CN201711017172 A CN 201711017172A CN 107620746 B CN107620746 B CN 107620746B
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- 238000005553 drilling Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000003921 oil Substances 0.000 claims description 188
- 239000010720 hydraulic oil Substances 0.000 claims description 24
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 abstract description 7
- 230000006978 adaptation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
Abstract
The invention relates to a horizontal directional drilling machine dragging force instant lifting control system which comprises a hydraulic pump, a hydraulic motor, an electromagnetic valve, a first overflow valve and a multi-way valve, wherein a second overflow valve is integrated on the multi-way valve, the hydraulic pump is communicated with an oil port of the hydraulic motor through an oil port of the multi-way valve, the hydraulic pump is communicated with an oil tank through the electromagnetic valve and the second overflow valve, and the hydraulic pump is communicated with the first overflow valve through the electromagnetic valve and is communicated with the oil tank. According to the horizontal directional drilling machine back-dragging force instant lifting control system and the control method, the pressure set value of the second overflow valve is larger than the pressure set value of the first overflow valve, and the electromagnet on the electromagnetic valve is controlled to be powered on or not powered on so as to control the oil outlet of the hydraulic pump to be communicated or not communicated with the oil inlet of the first overflow valve, so that the maximum working pressure of the back-dragging hydraulic system is lifted, the requirement of instant lifting of the horizontal directional drilling machine back-dragging force is met, the lifting is accurate and quick, the structure is simple, the cost is low, the construction safety is guaranteed, and the performance of a machine is fully exerted.
Description
Technical Field
The invention relates to the field of a horizontal directional drilling machine back-dragging force system, in particular to a horizontal directional drilling machine back-dragging force instant lifting control system and a horizontal directional drilling machine back-dragging force instant lifting control method.
Background
In the construction process of the horizontal directional drilling machine back-dragging pipeline, a hydraulic pump drives a motor to rotate, a drill rod and a pipeline are dragged through a speed reducer and a gear rack, the static friction resistance of the pipeline is high, the starting efficiency of the hydraulic motor is low, the back-dragging force required for the back-dragging pipeline from static to dragging is maximum, in order to ensure the construction safety, in the actual construction process, the horizontal directional drilling machine with larger specification is often adopted for construction, and the performance of the machine cannot be fully utilized.
In the prior art, in order to raise the back dragging force of the horizontal directional drilling machine, a mode of adding a group of hydraulic motors and speed reducers is generally adopted and is isolated from a push-pull mechanism and a back dragging hydraulic system through a clutch and a stop valve, when the horizontal directional drilling machine is required to provide larger back dragging force, the clutch is required to be operated to be closed and the stop valve is required to be opened, and the mode is complex in structure, high in cost and inconvenient to operate, and the problem of motor suction damage caused by misoperation often occurs.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a horizontal directional drilling machine back-dragging force instant lifting control system and a control method, which can realize accurate and rapid lifting of the horizontal directional drilling machine back-dragging force.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the hydraulic pump is communicated with the first overflow valve through the electromagnetic valve and the second overflow valve respectively and then is communicated with the oil tank through the electromagnetic valve, the first overflow valve and the second overflow valve are connected in parallel, and the pressure set value of the second overflow valve is larger than that of the first overflow valve.
Further, an oil port A and an oil port B are arranged on the multi-way valve, and the oil port A and the oil port B of the multi-way valve are respectively communicated with the oil port A and the oil port B arranged on the hydraulic motor.
Further, the multi-way valve is provided with a P oil port, and the P oil port of the multi-way valve is communicated with an oil outlet of the hydraulic pump.
Further, an oil port A, an oil port B, an oil port P and an oil port T are arranged on the electromagnetic valve, the oil port A of the electromagnetic valve is communicated with an oil inlet of the first overflow valve, the oil port T of the electromagnetic valve and an oil outlet of the first overflow valve are respectively communicated with the oil tank, and the oil port B of the electromagnetic valve is blocked by a plug.
Further, an oil inlet of the P oil port of the electromagnetic valve and an oil inlet of the second overflow valve are respectively communicated with an oil outlet of the hydraulic pump, and the oil outlet of the second overflow valve is communicated with the oil tank.
Further, an electromagnet for controlling the hydraulic pump to be communicated with the first overflow valve is arranged on the electromagnetic valve, and the power supply or the power failure of the electromagnet is controlled by the pressure required by the back hauling hydraulic system.
Further, when the back dragging force of the back dragging hydraulic system is increased instantaneously, the electromagnet is powered, the P oil port of the electromagnetic valve is communicated with the B oil port and is not communicated with the A oil port, the B oil port of the electromagnetic valve is blocked, the oil outlet of the hydraulic pump is not communicated with the oil inlet of the first overflow valve, when the working pressure of the back dragging hydraulic system does not reach the pressure set value of the second overflow valve, the valve core of the second overflow valve is closed, the hydraulic oil output by the oil outlet of the hydraulic pump flows into the oil inlet of the second overflow valve and cannot flow back to the oil tank through the oil outlet of the second overflow valve, the hydraulic oil output by the oil outlet of the hydraulic pump also flows into the hydraulic motor through the P oil port of the multiway valve and then flows into the hydraulic motor to drive the push-pull speed reducer to work, when the working pressure of the back dragging hydraulic system rises and reaches the pressure set value of the second overflow valve, the hydraulic oil output by the hydraulic oil pump enters the second overflow valve through the oil inlet of the second overflow valve and flows into the oil tank through the oil outlet of the second overflow valve, and the maximum working pressure of the back dragging hydraulic system cannot be increased continuously, and the working pressure of the back dragging hydraulic system is determined by the pressure set value of the second overflow valve.
Further, when the hydraulic system of the back hauling is in normal operation, the electromagnet cannot be electrified, the P oil port of the electromagnetic valve is communicated with the A oil port, the A oil port of the electromagnetic valve is communicated with the oil inlet of the first overflow valve, the B oil port of the electromagnetic valve is plugged, when the working pressure of the hydraulic system of the back hauling is lower than the pressure set value of the first overflow valve, the valve core of the first overflow valve is closed, hydraulic oil output by the oil outlet of the hydraulic pump flows into the oil inlet of the first overflow valve through the P oil port and the A oil port of the electromagnetic valve and cannot flow back to the oil tank, hydraulic oil output by the oil outlet of the hydraulic pump flows into the multi-way valve through the P oil port of the multi-way valve and then flows into the hydraulic motor through the A oil port and the B oil port of the multi-way valve, when the working pressure of the hydraulic system of the back hauling is increased to reach the pressure set value of the first overflow valve, the valve core of the first overflow valve is started, the hydraulic oil output by the hydraulic oil of the hydraulic pump flows into the first overflow valve through the P oil port of the electromagnetic valve and then flows back to the oil tank through the oil tank of the oil outlet of the first overflow valve, and the maximum working pressure of the hydraulic system cannot be continuously increased at this moment, and the maximum working pressure of the hydraulic system is determined by the pressure set value of the first overflow valve at this moment.
Compared with the prior art, the invention has the following advantages:
the invention discloses a horizontal directional drilling machine back-dragging force instant lifting control system and a control method, wherein the system comprises a hydraulic pump connected with an engine or a transfer case, a hydraulic motor connected with a push-pull speed reducer, an electromagnetic valve, a first overflow valve and a multi-way valve, wherein a second overflow valve is integrally arranged on the multi-way valve, the first overflow valve and the second overflow valve are connected in parallel, an oil port A and an oil port B of the multi-way valve are respectively communicated with the oil port A and the oil port B arranged on the hydraulic motor, an oil port P of the electromagnetic valve, an oil port P of the multi-way valve and an oil inlet of the second overflow valve are communicated with the hydraulic pump, an oil port T of the electromagnetic valve, an oil outlet of the first overflow valve and an oil outlet of the second overflow valve are communicated with an oil tank, an oil port A of the electromagnetic valve is communicated with an oil inlet of the first overflow valve, an oil port B of the electromagnetic valve is plugged, and power obtaining of an electromagnet on the electromagnetic valve is controlled by the pressure required by a back-dragging hydraulic system. According to the instant lifting control system and the control method for the back-pulling force of the horizontal directional drilling machine, the first overflow valve and the second overflow valve are connected in parallel, the pressure set value of the second overflow valve is larger than the pressure set value of the first overflow valve, the electromagnet on the electromagnetic valve is controlled to be electrified or not electrified so as to control the oil outlet of the hydraulic pump to be communicated or not communicated with the oil inlet of the first overflow valve, and the maximum working pressure of the back-pulling hydraulic system is further lifted according to the pressure set values of the first overflow valve and the second overflow valve, so that the instant lifting requirement for the back-pulling force of the horizontal directional drilling machine is met, the lifting is accurate and quick, the structure is simple, the cost is low, the construction safety is guaranteed, the performance of the machine is fully exerted, and the application prospect is wide.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
1, a hydraulic pump; 2. an electromagnetic valve; 3. a first overflow valve; 4. a multiway valve; 5. a second overflow valve; 6. a hydraulic motor.
Detailed Description
The invention will be further described with reference to specific examples.
As shown in figure 1, the instant lifting control system for the back-pulling force of the horizontal directional drilling machine comprises a hydraulic pump 1, an electromagnetic valve 2, a first overflow valve 3, a multi-way valve 4, a second overflow valve 5 and a hydraulic motor 6 connected with a push-pull speed reducer, wherein the hydraulic pump 1, the electromagnetic valve 2, the first overflow valve 3, the multi-way valve 4, the second overflow valve 5 and the hydraulic motor 6 are connected with an engine or a transfer case, the second overflow valve 5 is integrated on the multi-way valve 4, an A oil port of the electromagnetic valve 2 is communicated with an oil inlet of the first overflow valve 3, an P oil port of the electromagnetic valve 2, an P oil port of the multi-way valve 4 and an oil inlet of the second overflow valve 5 are communicated with the hydraulic pump 1 through joints and are connected with an oil outlet of the hydraulic pump 1 in parallel, an oil port B of the electromagnetic valve 2 adopts a joint matched with an oil port B to seal, oil leakage is avoided, an oil port T of the electromagnetic valve 2, an oil outlet of the first overflow valve 3 and an oil outlet of the second overflow valve 5 are respectively communicated with the oil tank through pipelines, an oil port A oil port of the multi-way valve 4 and an oil port B oil port of the hydraulic motor 6 are respectively connected with an oil port A and an oil port of the second overflow valve 5 in parallel, a pressure set value of the second overflow valve 5 is larger than the pressure set value of the first overflow valve 3, the hydraulic pump 1 is driven by the hydraulic pump or the hydraulic motor 1 through the transfer case 4 to drive the hydraulic motor 1.
The electromagnetic valve 2 is provided with an electromagnet for controlling the hydraulic pump 1 and the first overflow valve 3 to be opened and closed, the electromagnet of the electromagnetic valve 2 has two states of power obtaining and power non-obtaining and is controlled by the pressure required by the back-dragging hydraulic system, the power non-obtaining and power obtaining of the electromagnet respectively control the communication and the non-communication between the hydraulic pump 1 and the first overflow valve 3, the maximum working pressure of the back-dragging hydraulic system is lifted according to the pressure set values of the first overflow valve 3 and the second overflow valve 5, the requirement of instant lifting of the back-dragging force of the horizontal directional drilling machine is met, and the lifting is accurate and quick, not only the construction safety is ensured, but also the performance of the machine is fully exerted.
The control method of the horizontal directional drilling machine dragging force instant lifting control system comprises the following steps:
when the back-hauling hydraulic system works normally, the electromagnet of the electromagnetic valve 2 is not electrified, the P oil port of the electromagnetic valve 2 is communicated with the A oil port, the A oil port of the electromagnetic valve 2 is communicated with the oil inlet of the first overflow valve 3, the oil outlet of the hydraulic pump 1 is communicated with the oil inlet of the first overflow valve 3 through the oil port of the electromagnetic valve 2, the T oil port of the electromagnetic valve 2, the oil outlet of the first overflow valve 3 and the oil outlet of the second overflow valve 5 are communicated with the oil tank through pipelines respectively, the A oil port and the B oil port of the multi-way valve 4 are communicated with the A oil port and the B oil port of the hydraulic motor 6 respectively, the pressure set value of the second overflow valve 5 is larger than the pressure set value of the first overflow valve 3, when the working pressure of the back-hauling hydraulic system does not reach the pressure set value of the first overflow valve 3, the valve core of the first overflow valve 3 is closed, the hydraulic oil output through the oil outlet of the hydraulic pump 1 flows to the electromagnetic valve 2 through the P oil port and the A oil port of the electromagnetic valve 2 and flows into the oil inlet of the first overflow valve 3 through the A oil port of the electromagnetic valve 2, the first overflow valve 3 flows back to the oil tank through the oil inlet of the first overflow valve 4, the output oil outlet of the hydraulic oil of the hydraulic pump 1 flows back to the oil tank through the first overflow valve 4 enters the first overflow valve 4 to the first overflow valve 4A 6, the hydraulic valve 4 enters the pressure set-up valve 4 through the first overflow valve 5, and the pressure set-up valve 4 is driven by the pressure set-up valve 4B, when the working pressure of the hydraulic oil enters the hydraulic valve 4 is driven by the back-hauling hydraulic valve 4 is opened, when the working pressure is up through the pressure set pressure of the hydraulic valve 4 is reached, the hydraulic oil output by the oil outlet of the hydraulic pump 1 enters the first overflow valve 3 through the P oil port and the A oil port of the electromagnetic valve 2 and then flows back to the oil tank through the oil outlet of the first overflow valve 3, at the moment, the working pressure of the back-hauling hydraulic system cannot be continuously increased, and the maximum working pressure of the back-hauling hydraulic system is determined by the pressure set value of the first overflow valve 3;
when the working pressure required by the back-hauling hydraulic system is increased instantaneously, the electromagnet of the electromagnetic valve 2 is electrified, the P oil port and the B oil port of the electromagnetic valve 2 are communicated and not communicated with the A oil port, the B oil port of the electromagnetic valve 2 is blocked, the oil outlet of the hydraulic pump 1 cannot be communicated with the oil inlet of the first overflow valve 3 through the electromagnetic valve 2, the oil outlet of the hydraulic pump 1 is communicated with the P oil port of the multi-way valve 4 and the oil inlet of the second overflow valve 5, when the working pressure of the back-hauling hydraulic system does not reach the pressure set value of the second overflow valve 5, the valve core of the second overflow valve 5 is closed, the hydraulic oil output by the oil outlet of the hydraulic pump 1 flows into the multi-way valve 4 through the P oil port of the multi-way valve 4, the hydraulic oil input into the hydraulic motor 6 through the A oil port and the B oil port of the multi-way valve, and then drives the push-pull speed reducer to work, the hydraulic oil output by the oil outlet of the hydraulic pump 1 also flows into the second overflow valve 5 through the oil inlet of the second overflow valve 5, and the valve core of the second overflow valve 5 is blocked, the hydraulic oil cannot flow back to the oil tank of the second overflow valve 5 through the oil outlet of the second overflow valve 5, when the working pressure of the back-hauling hydraulic system does not reach the pressure set value of the second overflow valve 5, the working pressure of the back-hauling hydraulic system is increased, the working pressure of the hydraulic oil output by the second overflow valve 5 through the second overflow valve 5, and the working pressure set value of the hydraulic oil tank is continuously the working pressure is increased through the second overflow valve 5, and the working pressure of the back-pressure set value of the second overflow valve 5.
When the back-dragging hydraulic system works normally, the valve core of the first overflow valve 3 is closed, the electromagnet of the electromagnetic valve 2 is not electrified, the maximum working pressure of the back-dragging hydraulic system is determined by the pressure set value of the first overflow valve 3, the pressure set value of the first overflow valve 3 is a normal set value, and the maximum back-dragging force is a normal set value; when the required working pressure of the back-dragging hydraulic system is instantly lifted, the electromagnet of the electromagnetic valve 2 is powered, the oil outlet of the hydraulic pump 1 cannot be communicated with the first overflow valve 3 through the electromagnetic valve 2, the oil outlet of the hydraulic pump 1 is only communicated with the multi-way valve 4 and the second overflow valve 5, the maximum working pressure of the back-dragging hydraulic system is determined by the pressure set value of the second overflow valve 5, and the maximum working pressure of the back-dragging hydraulic system is instantly lifted due to the fact that the pressure set value of the second overflow valve 5 is larger than the pressure set value of the first overflow valve 3, and the back-dragging force of the horizontal directional drilling machine is instantly lifted.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (7)
1. The hydraulic pump (1) is communicated with an oil tank through the electromagnetic valve (2) and the second overflow valve (5) respectively, the hydraulic pump (1) is communicated with the first overflow valve (3) through the electromagnetic valve (2) and is communicated with the oil tank again, the first overflow valve (3) is connected with the second overflow valve (5) in parallel, and the pressure set value of the second overflow valve (5) is larger than that of the first overflow valve (3);
an oil port A, an oil port B, an oil port P and an oil port T are arranged on the electromagnetic valve (2), the oil port A of the electromagnetic valve (2) is communicated with an oil inlet of the first overflow valve (3), the oil port T of the electromagnetic valve (2) and an oil outlet of the first overflow valve (3) are respectively communicated with an oil tank, and the oil port B of the electromagnetic valve (2) is blocked by a plug; the electromagnetic valve (2) is provided with an electromagnet for controlling the hydraulic pump (1) and the first overflow valve (3) to be opened and closed.
2. The horizontal directional drilling machine dragging force instant lifting control system according to claim 1 is characterized in that an oil port A and an oil port B are arranged on the multi-way valve (4), and the oil port A and the oil port B of the multi-way valve (4) are respectively communicated with the oil port A and the oil port B arranged on the hydraulic motor (6).
3. The horizontal directional drilling machine dragging force instant lifting control system according to claim 1 is characterized in that a P oil port is arranged on the multi-way valve (4), and the P oil port of the multi-way valve (4) is communicated with an oil outlet of the hydraulic pump (1).
4. The horizontal directional drilling machine dragging force instant lifting control system according to claim 1 is characterized in that a P oil port of the electromagnetic valve (2) and an oil inlet of the second overflow valve (5) are respectively communicated with an oil outlet of the hydraulic pump (1), and the oil outlet of the second overflow valve (5) is communicated with an oil tank.
5. The horizontal directional drilling machine back hauling force instant lifting control system according to claim 1, wherein the power supply or the power non-supply of the electromagnet is controlled by the pressure required by a back hauling hydraulic system.
6. The control method of the horizontal directional drilling machine back-dragging force instant lifting control system is characterized in that when the back-dragging force of the back-dragging hydraulic system is instantly lifted, the electromagnet is electrified, the P oil port of the electromagnetic valve (2) is communicated with the B oil port and is not communicated with the A oil port, the B oil port of the electromagnetic valve (2) is blocked, the oil outlet of the hydraulic pump (1) is not communicated with the oil inlet of the first overflow valve (3), when the working pressure of the back-dragging hydraulic system does not reach the pressure set value of the second overflow valve (5), the valve core of the second overflow valve (5) is closed, hydraulic oil output by the oil outlet of the hydraulic pump (1) flows into the oil tank through the oil inlet of the second overflow valve (5) and cannot flow back to the oil tank through the oil outlet of the second overflow valve (5), the hydraulic oil output by the oil outlet of the hydraulic pump (1) also flows into the multi-way valve (4) through the P oil port of the multi-way valve (4) and then enters the hydraulic motor (6) and drives the push-pull speed reducer, when the working pressure of the back-dragging hydraulic system is lifted to the pressure set value of the second overflow valve (5), the working pressure of the second overflow valve (5) is not reached, the hydraulic oil output of the second overflow valve (5) continues to flow into the second overflow valve (5) through the oil inlet of the second overflow valve (5), the maximum operating pressure of the back-hauling hydraulic system is determined by the pressure set point of the second overflow valve (5).
7. The control method of the horizontal directional drilling machine back-dragging force instant lifting control system is characterized in that when the back-dragging hydraulic system is in normal operation, the electromagnet cannot be electrified, the P port of the electromagnetic valve (2) is communicated with the A port, the A port of the electromagnetic valve (2) is communicated with the oil inlet of the first overflow valve (3), the B port of the electromagnetic valve (2) is blocked, when the working pressure of the back-dragging hydraulic system is lower than the pressure set value of the first overflow valve (3), the valve core of the first overflow valve (3) is closed, hydraulic oil output by the oil outlet of the hydraulic pump (1) flows into the oil inlet of the first overflow valve (3) through the P port and the A port of the electromagnetic valve (2) and cannot flow back to the oil tank, hydraulic oil output by the oil outlet of the hydraulic pump (1) flows into the multi-way valve (4) through the A port and the B port of the multi-way valve (4) and then flows into the hydraulic motor (6) through the A port and the B port of the multi-way valve (4), the push-pull speed reducer is driven by the hydraulic motor (6), when the working pressure of the back-dragging hydraulic system is higher than the pressure set value of the first overflow valve (3), the hydraulic oil output by the first overflow valve (3) reaches the first overflow valve (3) through the first overflow port (3) and then flows back through the first overflow valve (3) through the oil inlet of the first overflow valve (3), at this time, the working pressure of the back-hauling hydraulic system cannot be continuously increased, and the maximum working pressure of the back-hauling hydraulic system is determined by the pressure set value of the first overflow valve (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711017172.XA CN107620746B (en) | 2017-10-26 | 2017-10-26 | Control system and control method for instant lifting of back dragging force of horizontal directional drilling machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711017172.XA CN107620746B (en) | 2017-10-26 | 2017-10-26 | Control system and control method for instant lifting of back dragging force of horizontal directional drilling machine |
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| CN107620746A CN107620746A (en) | 2018-01-23 |
| CN107620746B true CN107620746B (en) | 2024-03-08 |
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| CN201711017172.XA Active CN107620746B (en) | 2017-10-26 | 2017-10-26 | Control system and control method for instant lifting of back dragging force of horizontal directional drilling machine |
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| CN111536092B (en) * | 2020-04-03 | 2022-08-09 | 湖南双达机电有限责任公司 | Hydraulic system, method for adjusting hydraulic system, and engineering vehicle |
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| JPH11293712A (en) * | 1998-04-14 | 1999-10-26 | Hitachi Constr Mach Co Ltd | Hydraulic controller |
| KR20040049087A (en) * | 2002-12-03 | 2004-06-11 | 대우종합기계 주식회사 | Steering system for changing relief pressure in forklift truck |
| JP2009185520A (en) * | 2008-02-06 | 2009-08-20 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Front wheel driving force augmenting device of self-propelled paving machine |
| CN101725589A (en) * | 2009-11-11 | 2010-06-09 | 北京市三一重机有限公司 | Hydraulic system and rotary drilling rig comprising same |
| CN106168113A (en) * | 2016-08-30 | 2016-11-30 | 江苏谷登工程机械装备有限公司 | A kind of propulsive mechanism reinforcement control system of horizontal directional drilling machine |
| CN207421009U (en) * | 2017-10-26 | 2018-05-29 | 徐州徐工基础工程机械有限公司 | A kind of horizontal directional drilling machine pull-back force transient rise control system |
-
2017
- 2017-10-26 CN CN201711017172.XA patent/CN107620746B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11293712A (en) * | 1998-04-14 | 1999-10-26 | Hitachi Constr Mach Co Ltd | Hydraulic controller |
| KR20040049087A (en) * | 2002-12-03 | 2004-06-11 | 대우종합기계 주식회사 | Steering system for changing relief pressure in forklift truck |
| JP2009185520A (en) * | 2008-02-06 | 2009-08-20 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | Front wheel driving force augmenting device of self-propelled paving machine |
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