KR101593234B1 - Reverse Rotation system of Fan for Construction equipment - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fan reverse rotation system for a heavy construction equipment in which a cooling fan used in a heavy construction equipment is automatically reversely rotated, but leakage of hydraulic fluid due to peak pressure does not occur during reverse rotation.

More specifically, the present invention relates to a hydraulic pump, A shock absorber including an accumulator when the heavy construction equipment is in operation; A cooling fan for cooling the hydraulic fluid flowing inside the heavy construction equipment; A branch flow path formed to allow the hydraulic fluid to flow into the cooling fan; A first valve that is provided on the branch flow path and is opened when the construction heavy equipment is in operation and is opened when the construction heavy equipment is turned off; A second valve provided in the cooling fan, the fan being opened to rotate in a forward direction when the heavy construction equipment is in operation and opened to rotate the fan in a reverse direction when the start is off; Wherein the first valve is opened to allow the hydraulic fluid to flow to the second valve and the cooling fan to rotate in accordance with the flow of the hydraulic fluid flowing into the second valve when the start of the heavy construction equipment is off, To a fan reverse rotation system of a heavy construction equipment.

Cooling fan, Cooling fan, Fan motor, Reverse rotation, Shock absorber, LIS, Solenoid valve

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan rotation system for a heavy construction equipment,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fan reverse rotation system for a heavy construction equipment in which a cooling fan used in a heavy construction equipment is automatically reversely rotated, but leakage of hydraulic fluid due to peak pressure does not occur during reverse rotation.

FIG. 1 is a graph showing an increase in peak pressure and a leakage in the case where the equipment is started in a cooling fan provided in a conventional construction heavy equipment to convert the fan to the forward rotation and the reverse rotation, And a shock absorbing device.

Referring to FIG. 2, in order to reverse the cooling fan, conventionally, after the construction heavy equipment switch is kept in the ON state, the reverse rotation switch of the cooling fan is turned on before the equipment is started, In order to rotate the cooling fan forward again, the equipment had to be turned off, the cooling fan's reverse rotation switch turned off, and the equipment started again.

Therefore, in the related art, the operation procedure for reversing the cooling fan is complicated, and there is a disadvantage that it takes time and is troublesome because the operator must manually perform the reverse rotation. In addition, there has been a problem that fuel is wasted because the operation of starting the equipment and turning off the start-up is repeated for the reverse rotation of the cooling fan. Such inconveniences and disadvantages have caused a problem that a worker does not perform a reverse rotation process of the cooling fan, and foreign matter or the like is adhered to cause a failure of the cooling fan or to remove foreign matter.

To solve this problem, a device has been recently developed in which the cooling fan automatically operates for a certain period of time after the equipment is started.

For equipment where the cooling fan is automatically activated for a period of time after the machine starts up,

First, as shown in the graph shown in FIG. 1, when the driver accelerates when the cooling fan automatically rotates for a certain period of time after starting the apparatus, peak pressure is generated in the motor of the cooling fan, There is a problem that occurs.

Second, when the equipment is started without using the equipment for a long time, foreign substances such as dust are fixed even if the cooling fan rotates for a certain period of time. Therefore, there is a disadvantage that the cleaning effect of removing foreign substances by the rotation of the cooling fan can not be obtained have.

Therefore, even if the cooling fan is rotated forward after the cooling fan is rotated in the reverse rotation system used in construction heavy equipment, no load is applied to the motor of the cooling fan, leakage of the operating oil does not occur, foreign substances are fixed to the equipment, And it is required to develop a fan reverse rotation system that can prevent the phenomenon that foreign matter is not removed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a fan for a heavy construction equipment capable of easily cleaning equipment using reverse rotation of a cooling fan provided in a heavy construction equipment, The object of the present invention is to provide a rotating system.

A cooling fan (30) rotatably driven to cool an inside of a heavy construction equipment; An operating oil pump 10 for providing a hydraulic pressure for rotating and driving the cooling fan 30; And reverse rotation driving means for driving the cooling fan (30) in the construction heavy equipment in a reverse direction; Wherein the cooling fan (30) is rotated in a forward direction to cool the interior of the heavy construction equipment when the heavy construction equipment is in operation, and supplies the hydraulic pressure from the hydraulic pump (10) when the heavy equipment is turned off, And the reverse rotation driving means is driven to rotate in the reverse direction.

The present invention is characterized in that the reverse rotation drive means includes an accumulator (21) charged with hydraulic oil supplied from the hydraulic pump (10) when the construction heavy equipment is in operation; A branch passage (40) branched from a path through which the hydraulic oil flows from the hydraulic pump (10) to the accumulator (21), and is formed such that hydraulic oil flows into the cooling fan (30); A first valve (41) provided on the branch passage (40), which is opened when the construction heavy equipment is in operation and is opened when the construction heavy equipment is turned off; And a second valve (31) provided in the cooling fan (30) and opened to allow the fan to rotate in the forward direction when the heavy construction equipment is running and to turn the fan in the reverse direction when the start of the heavy construction equipment is turned off; And a control unit.

The present invention further includes a shock absorber (20) for absorbing, by hydraulic pressure, vibration generated by the pitch movement caused by the operation of the working tool of the construction heavy equipment, wherein the accumulator (21) And the hydraulic oil supplied from the hydraulic pump 10 is charged when the construction heavy equipment is in operation.

The present invention is characterized in that the hydraulic oil filled in the accumulator 21 is opened by the first valve 41 and flows to the second valve 31 through the branch passage 40 to be supplied to the accumulator 21, The flow of the hydraulic fluid flowing into the second valve 31 is stopped and the reverse rotation of the cooling fan 30 is terminated.

The fan reverse rotation system for a heavy construction equipment according to the present invention comprises:

First, when the equipment is turned off after using the heavy construction equipment, the flow path of the solenoid valve is changed so that the hydraulic oil accumulated in the shock absorber flows into the cooling fan, so that the cooling fan is automatically rotated. Therefore, There is a convenient advantage that no rotation is required.

Secondly, since the cooling fan is automatically rotated reversely after the starting of the heavy construction equipment, the peak pressure of the cooling fan is not formed because an external load such as acceleration is not provided, and the leakage phenomenon of the operating oil does not occur.

Third, since the reverse rotation process of the cooling fan is performed after turning off the engine after using the heavy construction equipment, the foreign matter adhered to the equipment is not fixed, so that the foreign matter such as dust adhered to the equipment can be easily cleaned.

Generally, construction equipment is also called civil engineering machine, and its kind is very diverse including excavator, wheel loader, forklift and skid loader. Although most of the equipment currently used in construction equipment can be considered as unmanned equipment, it is a type in which the worker carries on the process directly, and this kind of attraction equipment has the merit that the operator can recognize the progress of the work and the variable condition and respond quickly have.

As an example of construction heavy equipment, excavator is a civil engineering machine used for mining earth or rock, including residential land development project, road and sewage construction, river remodeling and construction work, tunnel and subway construction work, soil erosion work, It is equipment that performs various tasks such as loading work. Such an excavator has a lower traveling body driven by a track or wheel, an upper swinging body including a cabin which is swingably connected to an upper end of the lower traveling body so that a driver can ride the vehicle, Work equipment such as a boom, an arm, a bucket, etc., which are rotatably coupled in the direction of the vehicle.

In such construction heavy equipment, work equipment is often operated by a hydraulic cylinder in order to obtain a large torque. Work equipment is operated by hydraulic oil flowing in each hydraulic cylinder, and hydraulic equipment . Therefore, the operating oil can be utilized in a wide range, and a cooling fan can be formed to reduce the load on the radiator to cool it. However, due to the nature of heavy construction equipments, the surrounding environment where equipment is used is used in dusty and other foreign environment such as foundation construction work for civil engineering. Therefore, foreign matters or the like may be adhered to the equipment by the forward rotation of the cooling fan, and they may be stuck or agitated over time.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings to solve the above-mentioned problems. FIG. 3 is a hydraulic circuit diagram showing a main portion of a fan reverse rotation system according to the present invention, and FIG. 4 is a hydraulic circuit diagram of a construction heavy equipment having a fan reverse rotation system according to the present invention.

Referring to FIGS. 3 and 4, the fan reverse rotation system provided in the heavy construction equipment is provided with power for rotating the fan when the equipment is turned off. The reverse rotation system according to an embodiment of the present invention for reverse rotation of the fan includes a cooling fan 30, an operating oil pump 10 serving as driving means for rotating the cooling fan 30 in an opposite direction, an accumulator 21, A first valve 41 provided on the branch flow path 40 and a second valve 31 provided on the cooling fan 30, do.

The hydraulic pump 10 is a main pump that stores hydraulic oil flowing inside the heavy construction equipment.

Referring to FIGS. 3 and 4, the shock absorber 20 is provided to absorb vibrations generated by the pitch movement due to the operation of the work equipment of heavy construction equipment by hydraulic pressure. In the case of a wheel loader, for example, the shock absorber 20 may be configured such that vibrations and noise caused by the load of the bucket are transmitted to the driver and the engine room on the cabin when the bucket is loaded with the load Which is transmitted to each of the devices to give an uncomfortable feeling to the driver and to cause damage or breakdown of the equipment. Such an apparatus is called a LIS (Load Isolating System) and is connected to an accumulator for shock absorption in a hydraulic cylinder that operates a boom, and supplies operating fluid to reduce the amount of impact caused by pitch movement of the equipment. If this is provided, the working efficiency per unit time increases and the dynamic stability is satisfied, which is advantageous in the case of high-speed driving of the equipment. The shock absorber includes various means capable of absorbing impacts by hydraulic pressure as well as an LIS (Load Isolating System) which is one embodiment described above. The shock absorber 20 according to the present invention is not only used for preventing vibration and flow from work tools such as a bucket and a boom but also for preventing the fan motor It is also used to offset the shock energy due to the hydraulic pressure that can be received. This will be described later. The shock absorber (20) includes the accumulator (21). The accumulator 21 is an accumulator provided in the LIS system as described above. The accumulator (21) can be filled with the hydraulic fluid supplied from the hydraulic pump (10) when the heavy equipment is under construction.

Referring to FIGS. 3 and 4, the cooling fan 30 may be provided to cool the hydraulic fluid flowing in the heavy construction equipment. The cooling fan 30 may be for cooling a radiator for preventing overheating of the hydraulic fluid flowing in the heavy construction equipment as described above. The cooling fan 30 may include the second valve 31. The second valve 31 is formed to open and close the flow passage through which the hydraulic fluid flows in the cooling fan 30. The second valve 31 opens the flow path of the hydraulic oil so that the cooling fan 30 rotates in the forward direction when the heavy construction equipment is in operation. In addition, the second valve 31 forms a flow path of the hydraulic oil so that the flow direction of the hydraulic oil is opposite to that of the cooling fan 30 when the starting of the heavy construction equipment is off. 3 and 4, the second valve 31 preferably forms a respective flow path so as to form a flow path in the forward direction and the cross direction. The second valve 31 is preferably a solenoid valve. The solenoid is made by winding the wire tightly and uniformly in a cylindrical shape and is used as an energy conversion device and an electromagnet. When a current is applied to the solenoid, the magnetic field becomes almost zero outside the cylinder and a uniform magnetic field is formed inside. The magnitude of the internal magnetic field is proportional to the magnitude of the current and proportional to the number of turns per unit length. The solenoid valve is designed to open and close the valve depending on the magnetic field generated by the solenoid.

3 and 4, it is preferable that the branch passage 40 is branched from the passage of the hydraulic oil flowing from the hydraulic pump 10 to the accumulator 21. The branch flow path 40 is formed integrally with the flow path through which the operating fluid flows into the cooling fan 30 so that the operating fluid flows into the cooling fan 30. [ The first valve (41) may be provided on the branch passage (40). The first valve 41 may be opened when the heavy construction equipment is in operation and may be opened when the heavy construction equipment is switched off. The first valve (41) is closed when the construction heavy equipment is in operation, and blocks the hydraulic fluid from flowing to the branch flow path (40). When the start-up of the heavy construction equipment is turned off, the first valve (41) is opened to allow hydraulic oil to flow to the branch passage (40). Accordingly, when the start-up of the equipment is turned off, the hydraulic oil accumulated in the accumulator 21 provided in the shock absorber 20 flows through the branch passage 40. The operating fluid flowing through the branch flow path 40 flows into the cooling fan 30 and passes through the second valve 31 provided in the cooling fan 30. The second valve 31 opens the flow path of the hydraulic oil so that the cooling fan 30 rotates reversely when the start of the heavy construction equipment is turned off so that the flow of the hydraulic fluid from the accumulator 21 to the cooling fan 30 So that the operating oil rotates the cooling fan 30 in the reverse direction. The first valve 41 is preferably a solenoid valve, like the second valve 31. When all of the hydraulic fluid filled in the accumulator 21 flows to the second valve 31 through the branch passage 40 and the hydraulic fluid filled in the accumulator 21 is exhausted, The flow of the hydraulic fluid flowing into the cooling fan 30 is stopped and the reverse rotation of the cooling fan 30 is terminated.

In the above description, the shock absorber 20 provides the power for the reverse rotation of the cooling fan 30 as an example, so the present invention is not limited thereto. That is, the shock absorber 20 is an example of a power providing means for reversing the cooling fan 30 after turning off the start of the heavy construction equipment. In addition, after the start of the heavy construction equipment is turned off, The present invention can be implemented in various forms within a range capable of driving reverse rotation. For example, if the accumulator 21 is not necessarily installed in the shock absorber 20 but is provided so as to pressurize the hydraulic oil when driving the equipment for reverse rotation of the cooling fan 30, Of course, achieve the object of the present invention. The shock absorber 20 is adopted and described in the present embodiment in consideration of the fact that the shock absorber 20 can be utilized without installing an additional accumulator among various driving sources.

The technical idea should not be construed as being limited to the above-described embodiment of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, such modifications and changes are within the scope of protection of the present invention as long as it is obvious to those skilled in the art.

FIG. 1 is a graph showing an increase in peak pressure and an occurrence of leakage when the equipment is started in a cooling fan provided in a conventional construction heavy equipment and the fan is rotated forwardly and then reversely rotated.

2 is a hydraulic circuit diagram including a conventional cooling fan of a construction heavy equipment and a shock absorber.

3 is a hydraulic circuit diagram showing a main part of a fan reverse rotation system according to the present invention.

4 is a hydraulic circuit diagram of a heavy construction equipment having a fan reverse rotation system according to the present invention.

Description of the Related Art

10: hydraulic oil pump 20: shock absorber

21: Accumulator 30: Cooling fan

31: second valve 40:

41: first valve

Claims (4)

A cooling fan 30 rotatably driven to cool the interior of the heavy construction equipment; An operating oil pump 10 for providing a hydraulic pressure for rotating and driving the cooling fan 30; And And reverse rotation driving means for driving the cooling fan (30) of the heavy construction equipment in the reverse direction, The cooling fan (30) When the heavy construction equipment is in operation, it is rotationally driven in a forward direction to cool the interior of the heavy construction equipment, Wherein when the start-up of the heavy construction equipment is off, hydraulic pressure is supplied from the hydraulic pump (10), and the reverse rotation driving means is driven to rotate in the reverse direction. The method according to claim 1, Wherein the reverse rotation drive means includes: An accumulator (21) filled with hydraulic fluid supplied from the hydraulic pump (10) when the heavy construction equipment is in operation; A branch oil channel 40 branched from a path through which hydraulic fluid flows from the hydraulic pump 10 to the accumulator 21 and is supplied with hydraulic oil to the cooling fan 30; A first valve (41) provided on the branch passage (40), which is opened when the construction heavy equipment is in operation and is opened when the construction heavy equipment is turned off; And A second valve (31) provided in the cooling fan (30) and opened to allow the fan to rotate in a forward direction when the heavy construction equipment is running and to turn the fan in the reverse direction when the start of the heavy construction equipment is turned off; And a fan for rotating the fan. 3. The method of claim 2, And a shock absorbing device (20) for absorbing, by hydraulic pressure, vibration generated by the pitch movement by the operation of the working tool of the construction heavy equipment, The accumulator (21) is installed in the shock absorber (20) so as to store the hydraulic oil for absorbing the vibration, and the hydraulic oil supplied from the hydraulic pump (10) is charged when the construction heavy equipment is in operation A fan of a heavy construction equipment heavy equipment. 4. The method according to claim 2 or 3, The first valve 41 is opened and the hydraulic fluid filled in the accumulator 21 flows to the second valve 31 through the branch passage 40 and the hydraulic oil filled in the accumulator 21 is exhausted Accordingly, the flow of the hydraulic fluid flowing into the second valve (31) is stopped and the reverse rotation of the cooling fan (30) is terminated.

Images