JP2000272849A - Operation control method of transport elevator - Google Patents

Abstract

(57) [Summary] [Purpose] A transport elevator that lifts and lowers heavy objects such as transport trolleys that run on rails on the ground and underground used at construction sites such as tunnels. When dropping a carrier truck onto a basement rail from a transporter, the wire rope tension can be safely and reliably removed, the eccentricity of the load can be monitored, and acceleration and deceleration can be monitored. Provided is an operation control method capable of controlling acceleration / deceleration of a hoist so as to eliminate vibration. In the operation control method of a transport elevator that lifts and lowers a transport trolley traveling on rails, a load cell detects a rope tension of a hoist that suspends a transporter of the elevator on which a rail is disposed, and the loader detects the rope tension. When the rope tension becomes equal to or less than a predetermined set value after being stored in the cradle, a stop signal is sent to the hoist to stop the hoist.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the operation of a transport elevator that lifts and lowers a transport truck traveling on rails, and more particularly to the weight of a transport truck traveling on rails used mainly at construction sites and the like. The present invention relates to an operation control method of a transport elevator for lifting and lowering an object.

[0002]

2. Description of the Related Art In large cities, land use is becoming more sophisticated, and underground tunnels for urban traffic and underground rainwater are being actively constructed. It is usual to excavate a transport pit from the surface of the ground and excavate a tunnel laterally from the bottom. At that time, a transport lifting device was installed in the transport pit to transport materials such as an excavator for excavating the underground tunnel and concrete segments for supporting the inner wall of the tunnel to the underground, and to carry the excavated soil to the surface. Use to do.

[0003] In this underground tunnel excavating transport lifting device, it is necessary to raise and lower a transport vehicle traveling on rails above and below the ground to transport tunnel construction materials and excavated soil. Therefore, when lowering the transporter in the transport elevator that lifts and lowers the transport trolley, deposits it in the receiving stand, makes it land, and lowers the transport trolley from the transporter,
If the tension of the wire rope is not released, there is a danger that the transporter will jump due to the extra tension of the wire rope. Therefore, it is necessary to stop the hoist by releasing the tension of the wire rope. For this reason, in the prior art, when the carrier is kept in the cradle, the hoist is moved for a set time by a timer from a command that the landing confirmation limit switch is turned on to release the rope tension, and then stopped.

In such a method, the hoist is stopped by a timer or a limit switch after the carrier is stored in the cradle. Therefore, even if the elastic coefficient of the wire rope increases due to aging, the timer is stopped. As a result, the rope will become too loose when the hoist is stopped over years of use. Therefore, troubles such as rocking of the rope and occurrence of turbulence in the case of a multilayer winding occur, which adversely affects the life of the rope. Further, in the case of the pier type, the position fluctuates due to landing errors and rope elongation, and there is a drawback that finally the carrying carts are prevented from moving in and out.

[0005]

Therefore, in a transport elevator for lifting a heavy object such as a transport trolley running on rails above and below the ground used in a construction site such as a tunnel, the carrier is lowered and received. When dropping the transport trolley from the transporter onto the underground rails, drop the transport rope onto the basement rail without being affected by the aging of the wire rope elastic modulus. There is a demand for an operation control method that can be safely and reliably removed.

The present invention has been made in view of the above circumstances, and has been made in consideration of the above circumstances, and is used for transporting a heavy object such as a transport truck traveling on rails above and below ground used in a construction site such as a tunnel. In the elevator, when the carrier is lowered, deposited in the cradle and landed, and when the transport trolley is lowered from the carrier onto the underground rail, the tension of the wire rope can be safely and securely removed, and the eccentricity of the load It is an object of the present invention to provide an operation control method capable of monitoring a state and controlling acceleration and deceleration of a hoist so as to eliminate vibration during acceleration and deceleration.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method of controlling the operation of a transport elevator for lifting a transport trolley running on a rail, comprising the steps of: After the rope tension of the suspended hoist is detected by a load cell (load cell) and the transporter deposits it in the cradle, the hoist stops when the rope tension falls below a predetermined set value. It is characterized by sending a signal to stop the hoist. The predetermined set value is a value equal to or less than the weight of the transporter, or a value determined by a ratio with respect to the weight of the transporter based on a predicted time until the stop after the stop signal.

[0008] Further, in the operation control method of a transport elevator for raising and lowering a transport carriage traveling on a rail, the load cell detects the rope tension of a hoist that suspends a transporter of the elevator on which the rail is disposed,
It is characterized in that the load acting on the guide roller is also detected by a load cell provided on the guide roller of the transporter to monitor the eccentric state of the load.

Further, in a method of controlling the operation of a transport elevator for raising and lowering a transport trolley traveling on a rail, the rope tension of a hoist that suspends a transporter of the elevator on which the rail is arranged particularly when the lift distance is long. Is detected by a load cell, and a control signal is sent to the hoist to control the acceleration / deceleration of the hoist so that vibration during acceleration / deceleration of the hoist is removed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described. A heavy load such as a transport truck traveling on rails laid on the ground and underground mainly used in construction sites of underground tunnels and the like. In the transport elevator that lifts and lowers, the rope tension of the hoist that suspends the lift of the lift on which the rails are placed is detected by the load cell attached to the loader, and after the loader is deposited on the cradle, the rope tension is reduced. A stop signal is sent to the hoist when the value is equal to or less than a predetermined set value, that is, a value equal to or less than the carrier's own weight, or after the stop signal, when the value becomes a value determined by a ratio to the carrier's own weight by a predicted time until the stop. Send and stop the hoist.

Therefore, when the hoisting machine is stopped, the transporter is lowered, deposited in the receiving stand and landed, and when the transporter is lowered from the transporter to the underground rail, the tension of the wire rope is automatically and safely reduced. In addition, since the wire can be reliably pulled out, it is possible to completely prevent a risk that the transporter will jump due to the extra tension of the wire rope.

In addition, the load cell detects the rope tension of the hoist that suspends the carrier of the elevator on which the rails are arranged, and simultaneously detects the load acting on the guide roller by the load cell provided on the guide roller of the carrier. It can also monitor the eccentric state of the cargo.

Furthermore, particularly when the lifting distance is long, the load cell detects the rope tension of the hoist which suspends the conveyor of the hoist on which the rails are arranged, and the vibration during acceleration / deceleration of the hoist is removed. Since the control signal is sent to the hoist to control the acceleration / deceleration of the hoist, it is possible to safely lift and lower the transporter on which a heavy object such as a material is placed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for controlling the operation of a transport elevator according to the present invention will be described with reference to the drawings. FIG. 1 is a flowchart of the present embodiment, and FIG. 2 is an explanatory diagram of the present embodiment. Referring to FIG. 1, a case where the rope tension is detected and the hoist is stopped will be described. A bogie carrying materials and the like is loaded on a carrier on the ground floor, and the hoist is operated for hoist operation. When the carry-down operation is continued with the carrier lowered and left in the cradle, the rope is loosened with the carrier held in the cradle, and a stop command is issued when the rope tension falls below the carrier's own weight. . At that time, the hoist stops, and even if the bogie is unloaded by a battery car, the rope does not jump because the rope tension is already less than the weight of the transporter. After that, the trolley is transported from the transporter to the underground rail by a battery vehicle and transported to the work site.

FIG. 2 is an explanatory view of the hoisting device of the present embodiment. The hoisting drum 1 of the hoisting device winds or winds a rope 5 via a pair of pulleys 3 attached to a carrier 2 and a pair of ceiling pulleys 4. Return and move the carrier 2 up and down. Pin-type load cells 6 are provided on the axis of the pulley 3 attached to the transporter 2 to detect the tension of each rope 5.

FIG. 3 is a flowchart showing another embodiment of the present invention, in which the load acting on the guide roller is also detected by a load cell provided on the guide roller of the carrier, and the eccentric state of the load is monitored. To monitor the eccentric state of the load, load a truck carrying materials etc. on the carrier on the ground floor, operate the hoist to unwind, detect the rope tension and detect the roller load while the carrier descends. At the same time to calculate the load Af and the eccentricity Bm of the center of gravity.
The load Atf and the eccentricity Bm of the center of gravity are compared with a capacity table showing the relationship between the load and the distance from the center in FIG. 4, and if the load falls within the curve, the lift of the transporter is OK. Therefore, the eccentric state of the load can be constantly monitored. As a result, when this value is NO, the transfer of the load is performed.

FIG. 5 shows the relationship between the change in the speed of the hoist that suspends the lifting device and the change in the rope tension, particularly when the lifting distance is long, which is another embodiment. (A) is a speed change diagram of the hoist, and (b) is a graph showing a change in the rope tension during acceleration / deceleration obtained by detecting the rope tension by the load cell. In FIG. 5B, X is a portion where the rope tension changes due to the carrier vibration during acceleration, and Y is a portion where the rope tension changes due to the carrier vibration during deceleration. Therefore, from this graph, a control signal is sent to the hoist so as to cancel the change (vibration) of the rope tension during acceleration / deceleration of the hoist, and the hoist is controlled to stably raise and lower the transporter.

[0018]

According to the present invention described above, a carrier of a transport elevator for lifting a heavy object such as a transport trolley running on rails on the ground and underground used in a construction site such as a tunnel is suspended. After detecting the rope tension of the hoist being lowered by the load cell and depositing the carrier in the receiving stand, when the rope tension falls below a predetermined set value, a stop signal is sent to the hoist to wind the hoist. Since the machine is stopped, the tension of the wire rope can be automatically and safely removed when the transport trolley is lowered from the carrier onto the underground rails. Danger can be completely prevented. In addition, there is also an effect that the wire rope used can be used for a long time because it is not affected by the secular change of the elastic modulus of the wire rope as in the related art.

In addition, the load cell detects the rope tension of the hoist that suspends the carrier of the elevator on which the rails are arranged, and also detects the load acting on the guide roller by the load cell provided on the guide roller of the carrier. Therefore, since the eccentric state of the cargo being lifted and lowered can be constantly monitored, it is possible to more safely lift and lower the transporter on which heavy objects such as materials are placed.

Furthermore, particularly when the lifting distance is long, the load cell detects the rope tension of the hoist which suspends the transporter of the hoist on which the rails are arranged, and the vibration during acceleration / deceleration of the hoist is removed. Since the control signal is sent to the hoist to control the acceleration and deceleration of the hoist, the vibration of the transporter during the acceleration and deceleration of the hoist is completely eliminated, so that the lifting and lowering of the transporter on which heavy materials such as materials are placed can be performed more safely. Is possible.

[Brief description of the drawings]

FIG. 1 is a flowchart of the present embodiment.

FIG. 2 is an explanatory diagram of the present embodiment.

FIG. 3 is a flowchart of another embodiment.

FIG. 4 is a capability table showing a relationship between a loaded load and a distance from a center.

5A and 5B are diagrams illustrating a relationship between a speed change and a change in rope tension according to another embodiment. FIG. 5A is a diagram illustrating a speed change of a hoist, and FIG. 5B is a diagram illustrating a change in rope tension during acceleration / deceleration. It is a graph shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hoisting drum 2 Carrier 3 Carrier pulley 4 Ceiling pulley 5 Rope 6 Load cell

Claims (3)

[Claims] 1. A method for controlling the operation of a transport elevator that lifts and lowers a transport trolley traveling on a rail, wherein a load cell detects a rope tension of a hoist that suspends a transporter of the elevator on which a rail is disposed. The operation control of the transport elevator, wherein the hoist is stopped by sending a stop signal to the hoist when the rope tension becomes equal to or less than a predetermined set value after the carrier is deposited in the cradle. Method. 2. A method for controlling the operation of a transport elevator that raises and lowers a transport trolley traveling on rails, wherein the load cell detects a rope tension of a hoist that suspends a transporter of the elevator on which rails are disposed, An operation control method for a transport elevator, characterized in that a load acting on a guide roller is also detected by a load cell provided on a guide roller of a transporter to monitor an eccentric state of the load. 3. An operation control method of a transport elevator for lifting a transport truck traveling on a rail, particularly in a case where a lifting distance is long, a rope tension of a hoist suspending a transporter of the elevator on which a rail is arranged. Controlling the acceleration and deceleration of the hoist by sending a control signal to the hoist so as to remove vibration during acceleration and deceleration of the hoist by detecting the acceleration by the load cell. .