JPH04135504U - Malfunction prevention device when starting a garbage collection vehicle - Google Patents

Abstract

(57) [Summary] [Purpose] To carry out garbage loading work safely. [Structure] In a garbage collection vehicle that extracts power from a vehicle engine using a power extraction device, uses the power to drive a pressure oil generating device, and uses the generated pressure oil to operate a hydraulic work device to load garbage, the above When the power take-off device is connected, the power switch closes the contact, and once the a terminal is energized, the loading operation is performed, and when the b terminal is de-energized, the loading operation is stopped. a loading control mechanism, a loading operation start switch connected to the a contact of the loading control mechanism, a loading operation stop switch connected to the b contact of the loading control mechanism, and the power switch. Even if the contact of the loading operation start switch is set to "close", the current to the a contact of the loading control mechanism is cut off unless a predetermined period of time has elapsed since the contact of the loading control mechanism became "closed". It is equipped with a control means, and even if the power take-off device is turned on when the loading operation start switch is pressed by mistake, the time control means cuts off the power to the a contact of the loading control mechanism and the loading operation is stopped. A feature of the invention is that the locking operation is not performed.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention enables garbage to be loaded by mistake regardless of the worker's will when the garbage collection vehicle starts loading garbage. Regarding a malfunction prevention device when starting a garbage collection vehicle, which prevents the garbage collection vehicle from starting up. It is.

0002

[Conventional technology]

Generally, garbage collection work using garbage trucks moves to a designated garbage collection location and then stops. After stopping, loading work is carried out, and then moving to the next collection site. stop After repeating the above-mentioned movement and loading work between the collection locations, when the garbage is fully loaded, the dust is removed. The garbage is moved to a designated location such as a garbage treatment plant and is disposed of.

0003 By the way, the above garbage collection vehicle is equipped with a power extraction device to extract the power from the vehicle engine. (hereinafter referred to as P.T.O.) is set up, and when moving between collection locations, P. T. Drive with O turned off and start loading after stopping at the collection location. When doing so, P. T. Connect O to take out the power from the vehicle engine, and By driving a pressure oil generating device, such as a hydraulic pump, with force, this hydraulic pump Operates hydraulic work equipment such as hydraulic cylinders and hydraulic motors using the pressure oil generated in and carry out the garbage loading work.

0004 FIG. 2 is a circuit diagram of an electric control device that controls the above-mentioned hydraulic system, and 1 is a power source, e.g. With the power switch connected to the vehicle's battery 2, the P. T. Installed in O switching device and P. T. When O is set to "contact", the contact becomes "closed". 3 controls the loading operation. In the loading control mechanism, the a terminal is the start input terminal, and once this terminal is energized, the loading operation starts. The b terminal is a loading stop terminal, and once the power to this terminal is cut off, loading will start. stop moving. 4 is provided between the power switch 1 and the a terminal of the loading control mechanism 3. This is the loading operation start switch (hereinafter referred to as the start switch for short). A normally open pushbutton switch is used in which the contacts are "closed" when the button is pressed. 5 is electric A loading operation stop switch provided between the source switch 1 and the b contact of the loading control mechanism 3. This is a switch (hereinafter referred to as a stop switch for short), and when the button is pressed, the contacts are activated. A normally closed pushbutton switch that is "open" is used.

[0005] In the above electric circuit, when starting loading work, P. T. Change O to “tang” Then, the contact of the power switch 1 becomes "closed". In this way, the contacts of power switch 1 is in the "closed" state, and the worker tries to start the loading operation by pressing the start switch 4. When pressed, the contact point of this starting switch 4 becomes "closed", and the loading control mechanism 3 The loading operation is performed by energizing the a terminal of. Next, the loading operation is performed like this. The worker presses the stop switch 5 in an attempt to stop the loading operation. When operated, the contact of the stop switch 5 becomes "open" and the b terminal of the loading control mechanism 3 is opened. Power is cut off and the loading operation stops.

[0006]

[Problem that the idea aims to solve]

When starting loading work on the above garbage collection vehicle, P. T. "Touch" O By pressing the start switch 4 in the state that the loading control mechanism 3 is Loading operation is performed by energizing the terminal. However, the activation switch 4 is triggered by some kind of trigger. While being pressed by mistake due to the rubber, the P. T. If O is changed to “tangential” , the a terminal of the loading control mechanism 3 is energized and the loading operation is performed regardless of the worker's will. However, there was a problem that the garbage loading work was extremely dangerous.

[0007] This invention was proposed in view of the above-mentioned conventional problems, and its purpose is to The goal is to carry out work safely.

[0008]

[Means to solve the problem]

In order to achieve the above object, the present invention converts the power of the vehicle engine into P. T. Take out with O The power is used to drive the pressure oil generating equipment, and the generated pressure oil operates the hydraulic work equipment. In the garbage collection vehicle that also carries out garbage loading work, the above P. T. Make O “tangent” and the power switch whose contact is "closed", and once the power is energized to the a terminal, the loading operation is performed. There is a loading control mechanism that stops the loading operation once the power to the b terminal is cut off, and A loading operation start switch connected to the a contact of the loading control mechanism, and the loading control mechanism. Loading operation stop switch connected to the b contact of the mechanism and the contact of the above power switch The loading operation start switch cannot be connected until a predetermined period of time has elapsed since the When the power supply to the A contact of the loading control mechanism is cut off even if the contact is set to "closed". To provide a device for preventing malfunction at the time of startup of a garbage collection vehicle, which is equipped with a time control means.

[0009]

[Effect]

When the start switch is pressed by mistake, P. T. Even if O is set to “tangential”, the time Since the control means cuts off the power to the A contact of the loading control mechanism, the loading operation cannot be performed. is not performed.

0010

【Example】

Hereinafter, one implementation of the malfunction prevention device at the time of startup of a garbage collection vehicle according to the present invention is shown in Fig. 1. Let's explain based on an example. However, the same parts as in Fig. 2 are given the same reference numerals, and duplicates are omitted. Explanation of matters related to this will be omitted.

[0011] In Figure 1, 6 is a timer connected to the power switch 1, which turns on the power for a predetermined time. It has a normally closed timer contact 6a that opens when the timer contacts 6a open. It is connected to the starting switch 4. 7 is a relay connected to contact 6a of timer 6. The normally open relay contact 7a is closed when energized, and the reverse is energized. and normally closed relay contacts 7b and 7c that are "open", and the relay contact 7a is connected to the tie. The relay contact 7b is connected to the starting switch 4 and the loading control. A relay contact 7c is provided between the a contact of the control mechanism 3 and the stop switch 5. and the b contact of the loading control mechanism 3.

0012 In the above configuration, when starting loading work, P. T. When O is set to “tangential” , the contact of the power switch 1 becomes "closed" and the timer 6 is energized. And then When the timer 6 is energized for a predetermined period of time, the timer contact 6a becomes “open” and reset. The current to the relay 7 is cut off. In this way, P. T. Set O to “tang” After a predetermined period of time has elapsed, the worker tries to start the loading operation and presses the start switch. When the switch 4 is pressed, the contact of the start switch 4 becomes "closed", and the loading control machine is activated. The a terminal of the structure 3 is energized and the loading operation is performed. Next, the loading operation is performed like this. When the worker is trying to stop the loading operation, he presses the stop switch 5. When pressed, the contact point of this stop switch 5 becomes "open", and the loading control mechanism 3 The power supply to the b terminal is cut off and the loading operation stops.

[0013] On the other hand, the start switch 4 is accidentally pressed due to some trouble. When the contact of P. T. When O is connected, power switch 1 is closed. As a result, the a contact of the loading control mechanism 3 is energized, but immediately after that, the timer contact 6a Since the relay 7 is energized through the -Contacts 7b and 7c become "open", thereby preventing communication to contact a of the loading control mechanism 3. The power is cut off instantly and no loading operation takes place. At this time, timer 6 is also energized. Even if the timer contact 6a becomes “open” after a predetermined period of time has elapsed, the relay 7 will not reset. Since it is self-held by the relay contact 7a, the energization to the a contact of the loading control mechanism 3 is is shut off and no loading operation takes place.

[0014] Also, P. T. Before the predetermined time of timer 6 elapses after O is set to "close" Even if the start switch 4 is pressed to close the contact, the timer contact 6a Since the relay 7 is energized, the loading operation is not performed.

[0015] As explained above, in this invention, P. T. A predetermined amount of time has passed since O was set to “closed” If this is not done, the loading operation will not be performed even if the starting switch 4 is pressed.

[0016] In addition, in the above embodiment, in order to make the explanation easier to understand, timers and relays are used. Although it is controlled using a time control means, it is not possible to use a program such as a microcomputer. It is also possible to use a time control means using a gram control method.

[0017]

[Effect of the idea]

According to the present invention, P. Y. It will start if the predetermined time has not passed after O is set to "connected". Even if the start switch is operated, the loading operation does not start, so the start switch is not working properly. P. is under pressure due to trouble. T. Loading operation does not work even if O is set to “closed”. It is possible to prevent the work from being carried out regardless of the will of the contractor, and to carry out the garbage loading work safely. I can do it.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram for controlling a hydraulic system of a garbage collection vehicle to explain a device for preventing malfunction at startup of a garbage collection vehicle according to the present invention;

FIG. 2 is an electric circuit diagram for controlling a hydraulic system of a conventional garbage collection vehicle.

[Explanation of symbols]

1 Power switch 2 Power supply 3 Loading control mechanism 4 Loading operation start switch 5 Loading operation stop switch 6 Timer 6a Timer contact 7 Relay 7a Relay contact 7b Relay contact 7c Relay contact

Claims (1)

[Scope of utility model registration request] Claim 1: In a garbage collection vehicle that extracts power from a vehicle engine using a power extraction device, uses the power to drive a pressure oil generating device, and uses the generated pressure oil to operate a hydraulic work device to load garbage. , a power switch whose contact becomes "closed" when the power take-off device is "connected", and a loading operation is performed when the a terminal is energized, and a loading operation is performed when the energization to the b terminal is cut off. a loading control mechanism for stopping the loading operation; a loading operation start switch connected to the a contact of the loading control mechanism; a loading operation stop switch connected to the b contact of the loading control mechanism; If a predetermined period of time has not elapsed since the contact of the power switch was turned "closed", even if the contact of the loading operation start switch is "closed", the power to the a contact of the loading control mechanism is cut off. A device for preventing malfunction at the time of starting a garbage collection vehicle, characterized in that the device is equipped with a time control means.