JP2016210520A - Drive unit and its operation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive unit which can automatically adjust the tension of a belt of a conveyor at smaller energy consumption than a conventional drive unit, can be efficiency driven by the automatic adjustment of the tension, and can reduce a manufacture cost, and its operation method.SOLUTION: A main actuator 2a which is driven by fluid pressure comprises: a transport conveyor 6 which is driven independently from the main actuator 2a; a position holding cylinder 16 which can move a moving pulley 6b wound to an endless belt 8 of the transport conveyor 6 to a direction in which the tension of the endless belt 8 is changed, and fixes a position of the moving pulley 6b when the fluid pressure is not supplied; a main pump 12 which pushes out fluid; a control valve 3 which controls a flow of the fluid which is pushed out of the main pump 12; and a control device 14 which controls the control valve 3. The control device 14 controls the control valve 3 so as to supply the fluid to the position holding cylinder 16 when the main actuator 2a is not operated, and to supply the fluid to only the main actuator 2a when the main actuator 2a is operated.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drive device including a conveyor and an operation method thereof.

  As an example of a drive device provided with a conveyor, there is, for example, a continuous unloader. The continuous unloader is a device that continuously unloads bulk materials such as ore and coal from a ship's hold.

  Generally, the continuous unloader has a swivel frame that is installed on a quay and swivels in a horizontal plane, and a boom that is pivotably supported by the swivel frame and extends laterally toward the sea. The undulation of the boom is controlled by the expansion and contraction of a hydraulic cylinder attached thereto. A bucket elevator extending downward is attached to an end portion of the boom on the sea side, and a scraping portion for excavating loose materials is provided at a lower end portion thereof. The scraping unit includes an endless chain in which a plurality of buckets are connected, a motor that drives the endless chain, and the like. The bulk material in the hold is excavated in the bucket of the scraping section and continuously conveyed to the quay by a bucket elevator and a conveyor installed in the boom. Such a continuous unloader is disclosed in Patent Document 1, for example.

  In order for the conveyor to carry the cargo, the belt needs to have an appropriate tension. As a take-up device for managing the tension of the belt of the conveyor, for example, Patent Document 2 is disclosed. The take-up device of Patent Document 2 is a device that adjusts the belt tension by moving a roller hung on the belt with a fluid pressure cylinder in a direction to increase the belt tension.

JP-A-8-231055 Japanese Utility Model Publication No. 61-56316

  In the above-described take-up device of Patent Document 2, since the fluid pressure cylinder keeps the position of the roller while continuously adjusting the belt tension, the pump that always allows the fluid to flow into the fluid pressure cylinder during the operation of the conveyor. Must be driven. For this reason, in a conventional driving device (hereinafter, referred to as a conventional device), energy for driving the conveyor must always be consumed during driving of the conveyor. In addition, since the fluid pressure supplied to the fluid pressure cylinder must always be maintained, the conventional device has to be provided with dedicated equipment such as a pump, a fluid tank, and a fluid dedicated to the take-up device. Therefore, the conventional apparatus always requires energy for driving the take-up device in addition to the energy for driving the boom or the like, and the energy consumption is large.

  In addition, if the apparatus of Patent Document 2 is used to fix the position of the roller hung on the belt after adjusting the belt tension with the fluid pressure cylinder, the person changes the position of the roller every time the belt tension is adjusted. It will be fixed with screws. This requires a lot of manpower and labor. Therefore, there has been a demand for a mechanism that can adjust the belt tension with less energy consumption without human intervention.

On the other hand, a main pump that supplies fluid to a cylinder that raises and lowers a boom of a continuous unloader is generally driven during operation of a drive device. When the movement of the cylinder is stopped, the supply of fluid to the cylinder is stopped by the control valve while the main pump is driven. Meanwhile, the fluid discharged from the main pump flows out to the tank as it is and circulates between the main pump and the tank.
Therefore, energy consumption was wasted in the operation of the conventional apparatus.

  The present invention has been developed to solve the above-described problems. That is, an object of the present invention is to provide a driving device and a method for operating the same that can automatically adjust the belt tension of a conveyor with less energy consumption and can be driven more efficiently and reduce manufacturing costs than conventional devices. .

According to the present invention, a main actuator driven by fluid pressure;
A transport conveyor that is driven separately from the main actuator and circulates an endless belt;
When the fluid is supplied, the movable pulley hung on the endless belt can be moved in the direction in which the tension of the endless belt changes, and the position of the moving pulley is fixed when the fluid is not supplied. A cylinder,
A main pump that pushes out the fluid;
A control valve for controlling the flow of the fluid pushed out from the main pump;
A control device for controlling the control valve,
The control device controls the control valve to supply the fluid to the position holding cylinder when the main actuator is not driven and to supply only the main actuator when the main actuator is driven; Is provided.

Further, the drive device is an unloader, a reclaimer, or a stacker having a boom that extends in a horizontal direction and can be swung and undulated in a horizontal plane.
The main actuator is a fluid pressure cylinder that raises and lowers the boom.

The control valve includes a main control valve that opens and closes a flow path from the main pump to the main actuator;
A sub-control valve that opens and closes a flow path from the main pump to the position holding cylinder.

The position holding cylinder has a hollow cylindrical cylinder, and a piston having one end fitted into the hollow of the cylinder with an interference fit and the other end connected to the moving pulley,
The piston has a movable flow channel for flowing the fluid in a liquid-tight manner between an outer peripheral surface of the one end and an inner peripheral surface of the cylinder, and the fluid is interposed between the outer peripheral surface and the inner peripheral surface. Slidable along the inner peripheral surface of the cylinder at a certain time,
The sub control valve opens and closes a flow path from the main pump to the cylinder, and controls a position of the piston with respect to the cylinder; and
A second sub-control valve that opens and closes the flow path from the main pump to the movable flow path and controls the fixing and releasing of the position of the piston.

According to the present invention, a main actuator driven by fluid pressure;
A transport conveyor that is driven separately from the main actuator;
When the fluid is supplied, the moving pulley hung on the endless belt of the conveyor can move in the direction in which the tension of the endless belt changes, and the position of the moving pulley is fixed when the fluid is not supplied A position holding cylinder to
A main power pump for pushing out the fluid, and a drive device comprising:
The driving device characterized in that the fluid pushed out from the main pump is supplied to the position holding cylinder when the main actuator is not driven, and is supplied only to the main actuator when the main actuator is driven. A driving method is provided.

  According to the apparatus and method of the present invention described above, since the position of the moving pulley is fixed when no fluid is supplied, the adjustment is made without always injecting the fluid into the position holding cylinder during driving of the conveyor. The tension of the endless belt can be maintained. Therefore, the present invention does not consume energy in order to maintain the adjusted tension of the endless belt.

In the present invention, since it is not necessary to supply fluid to the position holding cylinder in order to maintain the tension of the endless belt, the main actuator driving equipment (for example, fluid , Main pump, fluid tank) can be used to drive the position holding cylinder. In other words, both the main actuator and the position holding cylinder can be driven as long as the amount of fluid is sufficient to drive the main actuator, for example.
Therefore, it is not necessary to prepare equipment for driving the position holding cylinder separately from that for the main actuator, so that the manufacturing cost of the driving device can be reduced. As a result, the power of the main pump that has been wastefully driven by the conventional apparatus can be used effectively for driving the position holding cylinder.
Therefore, the present invention can reduce energy consumption used for operation of the entire drive device.

  In the present invention, whether or not the position of the moving pulley is fixed can be adjusted by whether or not a fluid is supplied to the position holding cylinder. Therefore, by controlling the control valve with the control device, the tension of the endless belt can be automatically adjusted and the position of the moving pulley can be automatically fixed. Therefore, in the present invention, it is not necessary for a person to intervene in adjusting the tension of the endless belt, and manpower and labor required for adjustment can be reduced.

  Therefore, according to the present invention, the tension of the endless belt can be automatically maintained without adding energy consumption as compared with the conventional device, so that the drive device can be operated efficiently with less energy consumption.

It is explanatory drawing of the drive device of this invention. It is a piping diagram of the drive device of the present invention. It is explanatory drawing of the take-up apparatus which has the position holding cylinder of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.

FIG. 1 is an explanatory diagram of a driving apparatus according to the present invention.
The present invention is a drive device 1 including a main actuator 2a, a transport conveyor 6, a position holding cylinder 16, a main pump 12 for pushing out fluid, a control valve 3, and a control device 14, and an operation method thereof. Examples of such a driving device 1 include an unloader, a reclaimer, or a stacker that has a boom 24 that extends in a horizontal direction and can be swung and raised in a horizontal plane. Examples of the unloader include a continuous unloader and a belt unloader. In the present embodiment, the present invention will be described using a continuous unloader as an example.

The continuous unloader has a swivel frame that swivels in a horizontal plane, and a boom 24 that is pivotally supported by the swivel frame so as to be raised and lowered and extends in the lateral direction. A bucket elevator 26 that extends downward is attached to the tip of the boom 24, and a scraping portion 28 that excavates cargo such as loose articles is provided at the lower end thereof. The scraping unit 28 continuously excavates cargo (for example, bulk material in the hold) around the scraping unit 28 by rotating the endless chain to which a plurality of buckets are connected by a motor. The cargo in the bucket is continuously conveyed to the rear end of the boom 24 by the bucket elevator 26 and the transport conveyor 6 installed in the boom 24.
The raising and lowering of the boom 24 is controlled by the expansion and contraction of the main actuator 2a.

FIG. 2 is a piping diagram of the drive device of the present invention. FIG. 2 shows a state in which the position holding cylinder 16 is being driven.
The main actuator 2a is an actuator that is driven by the pressure of the fluid pushed out by the main pump 12 (hereinafter referred to as fluid pressure). In this embodiment, the main actuator 2a is a fluid pressure cylinder that raises and lowers the boom 24, for example. The main actuator 2a may be a hydraulic cylinder, for example, or may be another actuator.

  When the main actuator 2a is a hydraulic cylinder, fluid is injected into the inner space from pipes connected to both ends of the cylinder in the moving direction of the piston.

  A main control valve 2b is attached to a pipe connected to both ends of the cylinder of the main actuator 2a. The main control valve 2b is controlled by the control device 14, and opens and closes the flow path from the main pump 12 to the main actuator 2a. The control device 14 thereby controls the flow of the fluid pushed out of the main pump 12. For example, when the boom 24 is stopped while the drive device 1 is being driven, the main control valve 2b is controlled so that the flow path to the main actuator 2a is blocked while the main pump 12 is driven. Therefore, during driving of the driving device 1, the main pump 12 continues to be driven so that it can always respond to the driving of the main actuator 2a, regardless of whether the main actuator 2a moves or not. While the main control valve 2b is closed, the fluid flowing out from the main pump 12 is discharged to the fluid tank 30 through the relief valve 23 as it is.

In addition, it is preferable that the relief valve 23 used by this invention can be set so that fluid pressure may be adjusted in multiple steps, such as high pressure, medium pressure, low pressure, for example. For example, when the supply of fluid to both the main actuator 2a and the position holding cylinder 16 is stopped while the main pump 12 is operating, the control device 14 controls the relief valve 23 to set the fluid pressure to a low pressure. As a result, the entire amount of fluid flowing out of the main pump 12 returns to the fluid tank 30 via the relief valve 23 and circulates between the main pump 12 and the fluid tank 30.
For example, as will be described later, when the position holding cylinder 16 is driven by the fluid flowing out from the main pump 12, the fluid pressure is changed to an intermediate pressure (the fluid pressure when driving the position holding cylinder 16, that is, the necessary tension of the endless belt 8). The control device 14 controls the relief valve 23 to adjust.

The conveyor 6 is a conveyor that is driven separately from the main actuator 2a. The transport conveyor 6 is provided in, for example, the boom 24 and the bucket elevator 26, and includes a rotatable fixed pulley 6a and a movable movable pulley 6b, and an endless endless belt 8 wound around these pulleys. The conveyor 6 conveys the cargo from the scraping portion 28 to the rear end portion thereof through the bucket elevator 26 and the tip end portion of the boom 24 by rotating the endless belt 8.
The endless belt 8 is not limited to a belt but may be a wire or a driving chain.

FIG. 3 is an explanatory view of a take-up device having a position holding cylinder of the present invention.
The position holding cylinder 16 is a cylinder provided in the take-up device 10 for adjusting the tension of the endless belt 8. When the fluid is supplied, the position holding cylinder 16 can move the moving pulley 6b hung on the endless belt 8 of the conveyor 6 in the direction in which the tension of the endless belt 8 changes, and when the fluid is not supplied, the moving pulley 6b. It is a cylinder which fixes the position of.

  As shown in FIG. 3, the take-up device 10 includes a rail 10a extending in a direction in which the tension of the endless belt 8 is changed, a position holding cylinder 16, a bearing unit 10b described later, and a frame 10c assembled in a rectangle.

  The bearing unit 10 b is connected to the other end of the piston 16 b of the position holding cylinder 16. The bearing unit 10b has a rotating shaft of the movable pulley 6b that can rotate.

  The rail 10a is attached to the inside of a frame 10c assembled in a rectangular shape and fixed to the main body of the drive device 1, and the cylinder 16a of the position holding cylinder 16 is fixed to the frame 10c.

  The position holding cylinder 16 is a cylinder that is connected to the moving pulley 6b via the bearing unit 10b and moves the position of the moving pulley 6b. The position holding cylinder 16 is a hydraulic cylinder in this embodiment, but may be a cylinder using other fluid pressure.

  In this embodiment, the position holding cylinder 16 includes a hollow cylindrical cylinder 16a and a piston 16b having one end fitted into the hollow of the cylinder 16a with an interference fit. The reason why one end of the piston 16b is fixed with an interference fit is to prevent the movement of the piston 16b. The other end of the piston 16b is connected to the bearing unit 10b.

  The piston 16b has a movable flow path 22 for flowing fluid in a fluid-tight manner between the outer peripheral surface 20a at one end thereof and the inner peripheral surface 20b of the cylinder 16a. When the fluid flows into the movable flow path 22 at a predetermined pressure, a portion of the cylinder 16a that contacts the outer peripheral surface 20a of the piston 16b expands outward, and the outer peripheral surface 20a of the piston 16b and the inner peripheral surface 20b of the cylinder 16a. Fluid enters between the two. As a result, the interference fit state of the piston 16b is released, and the piston 16b can slide along the inner peripheral surface 20b in the inner space of the cylinder 16a.

  The fluid pressure flowing into the movable flow path 22 is adjusted by a relief valve 23 (see FIG. 2) provided in the fluid pressure circuit of the present invention and controlled to adjust the fluid pressure to an intermediate pressure. The relief valve 23 adjusts the fluid pressure to be lowered by returning a part of the fluid pushed out from the main pump 12 to the fluid tank 30. The control device 14 activates the relief valve 23, the fluid having the fluid pressure adjusted by the relief valve 23 flows into the movable flow path 22, and pushes the inner peripheral surface 20b of the cylinder 16a outward.

  On the other hand, when a predetermined pressure is no longer applied to the fluid in the movable flow path 22, the cylinder 16 a returns to its original shape, and the fluid is discharged from the movable flow path 22. Thereby, the cylinder 16a again fits the piston 16b with an interference fit, and the position of the piston 16b with respect to the cylinder 16a is fixed.

  That is, as shown in FIG. 3, the position holding cylinder 16 has three fluid inlets. One of the three inlets is an inlet to the movable flow path 22, and the remaining two are inlets provided at both ends of the cylinder 16a in the moving direction of the piston 16b. These inlets are connected to the main pump 12 by piping as shown in FIG.

  As shown in FIG. 2, the 1st sub control valve 18a is provided in the piping extended from the inlet provided in the both ends of the cylinder 16a. The first sub control valve 18a opens and closes the flow path from the main pump 12 to the cylinder 16a, and controls the position of the piston 16b with respect to the cylinder 16a. Specifically, for example, the control device 14 supplies the fluid to any one of the inner spaces at both ends of the cylinder 16a and causes the fluid to flow out from the other, thereby moving the piston 16b relative to the cylinder 16a. The first sub control valve 18a is controlled. For example, in the example of FIG. 2, when the main pump 12 is connected to one of both ends of the cylinder 16a, the first sub control valve 18a is configured to connect the fluid tank 30 to the other.

  Further, the first sub control valve 18a is also provided with a mechanism for stopping the supply of fluid to both the inner spaces of both ends of the cylinder 16a. In this embodiment, since the fluid pressure for driving the position holding cylinder 16 is different from the fluid pressure for driving the main actuator 2a, the cylinder 16a is used when the position holding cylinder 16 is not driven (when the position of the moving pulley 6b is fixed). The control device 14 controls the first sub-control valve 18a so as to stop the supply of fluid to both of the air in the both ends.

  The fluid adjusted to an intermediate pressure by the relief valve 23 flows into the inlets at both ends of the cylinder 16a. For example, in the example of the piping diagram shown in FIG. 2, the fluid pressure adjusted by the relief valve 23 becomes the tension of the endless belt 8 as it is. Therefore, in the present invention, one of a plurality of fluid pressures that can be set in the relief valve 23 is set in advance to the same fluid pressure (that is, intermediate pressure) as the necessary tension of the endless belt 8. Accordingly, the present invention can automatically adjust the tension of the endless belt 8 to the pressure preset by the relief valve 23 without actually measuring the tension of the endless belt 8 when the position holding cylinder 16 is driven.

  In the present invention, since the tension of the endless belt 8 can be automatically adjusted, it is not necessary for a person to intervene in adjusting the tension of the endless belt 8. Therefore, for example, when the take-up device 10 is at a high position in the drive device 1, it is not necessary for a person to climb the drive device 1 to that position in order to adjust the tension of the endless belt 8.

  A second sub control valve 18 b is provided in the pipe connected to the inlet to the movable flow path 22. The second sub-control valve 18b opens and closes the flow path from the main pump 12 to the movable flow path 22, and controls the fixing and release of the position of the piston 16b. That is, the control device 14 connects the main pump 12 and the movable flow path 22 when moving the piston 16b, and connects the fluid tank 30 and the movable flow path 22 when fixing the piston 16b. The second sub control valve 18b is controlled.

  The second sub control valve 18b is also provided with a mechanism for stopping both supply and outflow of the fluid in the movable flow path 22. After the fluid flows out of the movable flow path 22 and the position of the piston 16b with respect to the cylinder 16a is fixed, the control device 14 stops the flow of the fluid in the movable flow path 22 to the second sub control valve. It is preferable to control 18b.

  In this embodiment, since the tension of the endless belt 8 is smaller than the fluid pressure when the main actuator 2a is driven, the relief valve 23 described above is provided in the fluid pressure circuit of the present invention. When the position holding cylinder 16 is driven, the control device 14 controls the relief valve 23 so as to lower the fluid pressure to the tension of the endless belt 8.

  Accordingly, the control device 14 can automatically control the fluid supplied to the movable flow path 22 by automatically controlling the second sub control valve 18b, and can automatically control the fixing and release of the position of the piston 16b. . Therefore, the drive device 1 of the present invention can automatically adjust the tension of the endless belt 8 without any human intervention.

  Hereinafter, the first sub control valve 18a and the second sub control valve 18b are collectively referred to as the sub control valve 18. The control valve 3 is a general term for the main control valve 2 b and the sub control valve 18.

  The configuration of the position holding cylinder 16 of the present invention may be other configurations as long as the piston 16b moves when the fluid is supplied and the position of the piston 16b is fixed when the fluid supply is stopped. Good.

  The control device 14 controls the control valve 3. The control device 14 may be a personal computer, for example, or may be another control device.

  The control device 14 controls the control valve 3 so that the fluid is supplied to the position holding cylinder 16 when the main actuator 2a is not driven, and is supplied only to the main actuator 2a when the main actuator 2a is driven.

  That is, for example, in the case of this embodiment, the control device 14 shuts off both the two pipes connected to the cylinder of the main actuator 2a when the main actuator 2a is not driven (that is, when the boom 24 is not raised and lowered). The main control valve 2b is controlled. The control device 14 controls the second sub control valve 18b so as to connect the movable flow path 22 and the main power pump 12, and at the end of the cylinder 16a on the side where tension is applied to the endless belt 8. The first sub control valve 18a is controlled so that the main pump 12 is connected to the inlet of the part and the fluid tank 30 is connected to the inlet of the opposite end.

  In addition, after adjusting the tension of the endless belt 8 of the transport conveyor 6, the control device 14 controls the first sub control valve 18a so as to shut off the pipes connected to both ends of the cylinder 16a, and the movable flow path 22 is controlled. By controlling the second sub control valve 18b so as to be connected to the fluid tank 30, the position of the moving pulley 6b can be maintained.

  As a result, the drive device 1 including the main actuator 2a, the transport conveyor 6, the position holding cylinder 16, and the main pump 12 that supplies fluid to the main actuator 2a is prepared, and the main actuator 2a is not driven. The fluid pushed from the main pump 12 is supplied to the position holding cylinder 16 to adjust the tension of the endless belt 8, and when the main actuator 2a is driven, the fluid is supplied only to the main actuator 2a. The drive device 1 can be operated.

  In general, a conveyor belt used in the driving device 1 is made of a material that is difficult to stretch, such as a strong synthetic fiber, a chain, or a wire. Therefore, it is sufficient to adjust the tension of the endless belt 8 of the transport conveyor 6 once a month.

  On the other hand, during driving of the driving device 1, the main pump 12 is always operating even when the movement of the main actuator 2a is stopped. In this case, the drive device 1 blocks the inflow of fluid to the main actuator 2a by controlling the main control valve 2b while driving the main pump 12.

  The present invention uses the driving force of the main pump 12 when the main pump 12 is in operation and the main control valve 2b blocks the flow of fluid into the main actuator 2a. The operation of driving 16 is performed. For example, if the control device 14 is set in advance so as to adjust the endless belt 8 when the driving device 1 is started, the tension of the endless belt 8 is adjusted, and the endless belt 8 having the best tension is always used. The driving device 1 can be driven by the conveyor 6. Energy is not required for fixing the position of the piston 16b of the position holding cylinder 16.

Therefore, even if a pump, a fluid, and a fluid tank for driving the position holding cylinder 16 are not provided to add new energy consumption to the conventional apparatus, the energy of the endless belt 8 can be sufficiently increased with the energy already provided in the conventional apparatus. Tension can be adjusted.
Thereby, the drive device 1 can be efficiently driven with less energy consumption than the conventional device.

  In the apparatus and method of the present invention, whether or not the position of the moving pulley 6b is fixed can be adjusted by whether or not a fluid is supplied to the position holding cylinder 16, so that the control valve 3 is controlled by the control device 14. The tension of the endless belt 8 can be automatically adjusted, and the position of the moving pulley 6b can be automatically fixed. Therefore, in the apparatus and method of the present invention, since it is not necessary for a person to intervene in adjusting the tension of the endless belt 8, it is possible to reduce the labor required for the adjustment.

  According to the apparatus and method of the present invention described above, the position of the moving pulley 6b is fixed when no fluid is supplied, so that it is not necessary to always inject the fluid into the position holding cylinder 16 while the conveyor 6 is being driven. The adjusted tension of the endless belt 8 can be maintained. Therefore, the present invention does not consume energy to maintain the adjusted tension of the endless belt 8.

Further, in the present invention, since it is not necessary to supply fluid to the position holding cylinder 16 in order to maintain the tension of the endless belt 8, the time during which the main actuator 2a is not driven is used to drive the main actuator 2a. An operation can be performed in which equipment (eg, fluid, main pump 12, fluid tank 30) is used to drive the position holding cylinder 16. That is, for example, as long as there is an amount of fluid sufficient to drive the main actuator 2a, both the main actuator 2a and the position holding cylinder 16 can be driven.
Therefore, it is not necessary to prepare equipment for driving the position holding cylinder 16 separately from that for the main actuator 2a, so that the manufacturing cost of the driving device 1 can be reduced. As a result, the power of the main pump 12 that has been wastefully driven by the conventional apparatus can be effectively used to drive the position holding cylinder 16.
Therefore, the present invention can reduce energy consumption used for operation of the entire drive device.

  In the present invention, whether or not the position of the moving pulley 6b is fixed can be adjusted by whether or not a fluid is supplied to the position holding cylinder 16. Therefore, by controlling the control valve 3 with the control device 14, the tension of the endless belt 8 can be automatically adjusted and the position of the moving pulley 6b can be automatically fixed. Therefore, in the present invention, it is not necessary for a person to intervene in adjusting the tension of the endless belt 8, and manpower and labor required for the adjustment can be reduced.

  Therefore, according to the present invention, the tension of the endless belt 8 can be automatically maintained without adding energy consumption as compared with the conventional device, so that the drive device 1 can be operated efficiently with less energy consumption.

  Note that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

The drive device 1 of the present invention is not limited to the above-described unloader, and may be any other device as long as it has a transport conveyor 6 and a main actuator 2a that is driven separately.
For example, the drive device 1 of the present invention may be a reclaimer or a stacker. Even when the drive device 1 is a reclaimer or a stacker, the actuator that drives the boom of the reclaimer or the stacker is used as the main actuator 2a, and the hydraulic cylinder of the take-up device that adjusts the tension of the belt of the conveyor is used as the position holding cylinder 16. To do. The configuration of the present invention when the driving device 1 is a reclaimer or a stacker is the same as the above-described configuration when the driving device 1 is a continuous unloader.

  Further, the transport conveyor 6 of the present invention may be a conveyor that uses a drive chain as the endless belt 8.

1 drive device, 2a main actuator, 2b main control valve, 3 control valve,
6 Conveyor, 6a Fixed pulley, 6b Moving pulley, 8 Endless belt,
10 take-up device, 10a rail, 10b bearing unit, 10c frame,
12 main pumps, 14 controllers,
16 position holding cylinder, 16a cylinder, 16b piston,
18 sub-control valve, 18a first sub-control valve, 18b second sub-control valve,
20a outer peripheral surface, 20b inner peripheral surface, 22 movable flow path, 23 relief valve,
24 boom, 26 bucket elevator, 28 scraping section, 30 fluid tank

Claims (5)

A main actuator driven by the pressure of the fluid;
A transport conveyor that is driven separately from the main actuator and circulates an endless belt;
When the fluid is supplied, the movable pulley hung on the endless belt can be moved in the direction in which the tension of the endless belt changes, and the position of the moving pulley is fixed when the fluid is not supplied. A cylinder,
A main pump that pushes out the fluid;
A control valve for controlling the flow of the fluid pushed out from the main pump;
A control device for controlling the control valve,
The control device controls the control valve to supply the fluid to the position holding cylinder when the main actuator is not driven and to supply only the main actuator when the main actuator is driven; A drive device characterized by the above. The driving device is an unloader, a reclaimer, or a stacker having a boom that extends in a lateral direction and can be swung and undulated in a horizontal plane.
The drive device according to claim 1, wherein the main actuator is a fluid pressure cylinder that raises and lowers the boom. The control valve is a main control valve that opens and closes a flow path from the main pump to the main actuator;
The drive device according to claim 1, further comprising: a sub control valve that opens and closes a flow path from the main pump to the position holding cylinder. The position holding cylinder has a hollow cylindrical cylinder, and a piston having one end fitted into the hollow of the cylinder with an interference fit and the other end connected to the moving pulley,
The piston has a movable flow channel for flowing the fluid in a liquid-tight manner between an outer peripheral surface of the one end and an inner peripheral surface of the cylinder, and the fluid is interposed between the outer peripheral surface and the inner peripheral surface. Slidable along the inner peripheral surface of the cylinder at a certain time,
The sub control valve opens and closes a flow path from the main pump to the cylinder, and controls a position of the piston with respect to the cylinder; and
4. A second sub-control valve that opens and closes a flow path from the main pump to the movable flow path and controls fixing and releasing of the position of the piston. 5. Drive device. A main actuator driven by the pressure of the fluid;
A transport conveyor that is driven separately from the main actuator;
When the fluid is supplied, the moving pulley hung on the endless belt of the conveyor can be moved in the direction in which the tension of the endless belt changes, and the position of the moving pulley is fixed when the fluid is not supplied. A position holding cylinder to
A main power pump for pushing out the fluid, and a drive device comprising:
The driving device characterized in that the fluid pushed out from the main pump is supplied to the position holding cylinder when the main actuator is not driven, and is supplied only to the main actuator when the main actuator is driven. Driving method.

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