JPS6133490A - Television camera automatic elevating control system in tower crane, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] 1. Field of Industrial Application The present invention relates to an automatic elevation control system for a television camera in a tower crane or the like.

11 Conventional technology In order to improve work safety and work efficiency for tower cranes etc. that have long jibs (booms), a television camera is attached to the tip of the jib9 and the work status can be monitored on a monitor TV in the operator's cabin. We are checking and monitoring.

In this case, it is necessary to change the direction of the television camera according to the raising and lowering movement (angle change) of the jib.The current method uses a television camera whose direction can be controlled electrically, One method is to provide a control box that is electrically connected to the TV camera and manually operate the TV camera, and the other is to suspend the TV camera via a pivoting means so that it is always oriented vertically due to gravity.

However, in the former method, the operator has to operate the television camera in addition to operating the crane, which is very complicated and prevents the operator from concentrating all his attention on operating the crane. Furthermore, in the latter method, there is a problem in that the television camera shakes due to the raising and lowering motion of the jib.

111 Problems to be Solved by the Invention Kurotsuchi Therefore, the present invention electrically links the hoisting motion of the jib with the directional control of the television camera, thereby freeing the operator from the hassle of operating the camera, and improving crane operation. The aim is to improve safety and work efficiency by allowing employees to concentrate on their work only.

[Structure of the invention]

1. Means for Solving the Problems The present invention provides the ability to control the forward and reverse energization of a reversible motor for directivity control (hereinafter referred to as a camera motor) in a television camera attached to the tip of a jib (boom). Electrical switching is performed in conjunction with the ups and downs, and a detector is provided to detect the ups and downs of the jig, a timer is activated by the operation of the detector, and the camera motor is energized for a limited time through the timer. It consists of doing the following.

11 Effects Because of the above structure, the camera motor rotates appropriately in forward and reverse directions in conjunction with the raising and lowering movements of the jib, so that the television camera always faces the required predetermined direction even when the jib is raised and lowered. This allows the operator to concentrate solely on crane operation.

111 Embodiment FIG. 1 shows a tower crane l adopting the present invention,
In the figure, 11C is a mast having an elevating frame on the upper part; 12 is a rotating mount rotatably mounted on the mast; 13 is a guide support standing up on the swivel mount;
Reference numeral 14 indicates a driver's cab installed in the front part of the swivel base, 15 indicates a jib pivotally supported on the swivel base, and 16 indicates a tip of the jib from the hoisting device (not shown) of the swivel base through the upper end of the guide support. 17 is a hook suspended from the tip of the wire; 18 is a hoisting wire connected from the hoisting device 19 of the swivel base to the tip of the jib via the upper end of the guide support; 21 is a hoisting wire connected to the tip of the jib; The television camera of the television monitoring device 2 is mounted vertically downward at the tip of the television camera, and the television camera is equipped with a directional control means attached to the base 22.

FIG. 2 shows the television monitoring device 2 installed on the tower crane 1, and 21 denotes the television camera 21.
Reference numeral 22 is a base portion on which the television camera is mounted, and is provided with an electric pointing control means consisting of a reversible motor for controlling direction, that is, a television motor n. U is a monitor television connected to a television camera, and 5 is a control box attached to the monitor television and connected to a television motor, and these are installed in the operator's cab 14. CF, CR, L
S is as follows.

FIG. 3 shows an electric circuit related to the camera motor 23, which is set in the control box 5, except for the CF, CR and camera motor 23 in the figure.

In the figure, CF is a ``raise'' switch 6 that is turned on in conjunction with the raising operation of jib 5 during crane operation, CR is a ``lower'' switch that is turned ON in conjunction with the lowering operation of the jib, and LS is the above-mentioned hoisting device. This detector is connected to the hoisting drum shaft 191 of the hoisting device 19 and detects the hoisting angle and speed of the jib.As shown in FIG.
S.

is fixed and rotated, and the cam is configured to turn on the detection switch LS1 for about 1.0 seconds or more.

DF, DR, and M are the first to third relays, DFz, DI'h, Ml, which are energized when the 6-up switch CF--down switch CJ detection switch LSI is turned on, respectively.
.

M2 is the make contact of each relay DF, DR, M, M3 is the break contact of the third relay M, and T is the third
A timer that is energized when the first make contact M1 of the relay M is turned on, 'rlj:, the break contact of the timer, T
2 is a make contact of the timer, and the timer operates these contacts TI and T2 with a delay after about 0.7 seconds have elapsed each time the contacts TI and T2 are energized. HF is a manual switch for forward rotation of the camera motor, and HR is a manual switch for reverse rotation of the camera motor.

The camera motor 23 has an automatic power supply circuit and a manual power supply circuit installed in parallel, and in the automatic power supply circuit, the make contact DFI of the first relay DF and the make contact DFI of the second relay DR are connected to the forward rotation line and the reverse rotation line. The contact DRY is inserted in each, and the second make contact M2 of the third relay M and the break contact T1 of the timer T are inserted in series in the common line.In addition, in the manual power supply circuit, the forward rotation line and the reverse rotation line Manual switches HF and HR for forward and reverse rotation are used to intervene.
Moreover, a parallel circuit of the break contact M3 of the third relay M and the make contact T2 of the timer T is interposed in the common line.

With the above configuration, when operating the crane, jib 1
When the start operation in step 5 is performed, the "start" switch CF is turned on, the first relay DF is activated, and its make contact DPI is turned on.
turns on, and the normal rotation line along the camera motor is closed. Also, when the jib 15 is lowered, the "lower" switch CR is turned on, the second relay DR is activated, its make contact DRI is turned on, and the reverse rotation line of the camera motor O is closed. 0 And at the same time, the undulating device 19
is activated, the cam LSo rotates in the detector LS, the detection switch LSl is temporarily turned on (for approximately 0.7 seconds or more), the third relay M is activated, and the first and second relays are activated. Make contacts Ml and M2 are turned on, break contact M3 is turned off, and when the first make contact M1 is turned on, the timer T is activated, and when the second make contact M2 is turned on, the automatic power supply circuit for the camera motor n is closed. , camera motor n rotates forward or reverse in response to the raising and lowering operations of the jib 15. In addition, when the break contact M3 is turned OFF, the manual power circuit is opened, and the camera motor 23 cannot be operated manually. Now, the break contact T1 is turned OFF due to the timed operation of timer T.
'F l, the camera motor B stops.

At this time, as the jib 15 continues to be raised and lowered, the cam LSo of the detector LS rotates, so the detection switch LSI is turned ON L again, and at the same time, the break contact Tl and the make contact T2 of the timer T are turned on. The camera motor (A) rotates again for approximately 0.7 seconds in the same manner as above. While the jib continues to be raised and lowered in this manner, the camera motor (A) rotates for approximately 0.7 seconds. The forward and reverse rotation of the camera motor n, which repeats rotation and stop for 0 seconds, is achieved by intermittently correcting the orientation of the television camera 21 in response to the starting and lowering operations of the jib 15, as shown in FIG. As shown, the television camera 21 is always directed vertically downward even if the angle of elevation of the jib 5 changes.

Note that the reference point for the TV camera 210 is set at 4 of the jib 15.
It is best to place it at the 5th point.

By the way, as mentioned above, when the manual power supply circuit is opened by turning off the break contact M3 of the third relay M due to the turning on of the detection switch LSI, the manual switch HF,
The HR does not work, so there is no forward or reverse energization to the camera motor. However, when the TV motor n is stopped due to the timed operation of the timer T, the make contact T2 of the timer is turned ON, so the manual power supply circuit is not closed, and the manual switches HF and HR are activated immediately. Therefore, manual operation of the camera motor is possible.

Note that the screen adjustment of the television camera 21 is performed by adjusting the time limit of the timer T and manual switches HF and HR.

〔Effect of the invention〕

According to the present invention, it is possible to electrically link the raising and lowering motion of the jib and the directional control of the television camera, thereby freeing the operator from the hassle of operating the camera and allowing him to concentrate on crane operation. This can lead to higher safety and improved workability.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a side view of a tower crane, FIG. 2 is a configuration diagram of a television monitoring device, and FIG. 3 is a circuit diagram showing a control circuit related to a television motor. , FIG. 4 is an explanatory diagram of the operation, and FIG. 5 is a schematic diagram of the configuration of the detector. ■...Tower crane, 2...Television monitoring device, 21...Television camera, 22...Mounting at base,
23...Camera motor, U...Monitor TV, 5.
...Control box, CF...Page' power switch, CR...Page' power switch, LS...Detector, DF, DR, M...Relay, T...Timer,
HF, HR...manual switch Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] The reversible motor (camera motor) for directivity control of the television camera attached to the tip of the jib is switched between forward and reverse energization as the jib rises and falls, and also detects the jib's hoisting motion. An automatic elevation control system for a television camera in a tower crane or the like, characterized in that a detector is provided, a timer is activated by the operation of the detector, and the camera motor is energized for a limited time via the timer.