JPH01173892A - Buried body damage preventing device for crushing equipment - Google Patents

Abstract

PURPOSE:To save electric power by connecting the tip part of the crushing equipment to one end of a thyristor whose terminals are both connected to a power source and also connecting a buried pipe side to the voltage application contact of the thyristor. CONSTITUTION:The detection part and transmission part 2 of a buried body damage preventing device connects one terminal A of the thyristor SCR electrically to the crushing tip part of the crushing equipment 1. Then when the crushing tip of the crushing equipment 1 contacts the buried pipe side 10 and a short circuit is formed between the both, so a voltage is applied across the thyristor SCR and a photocoupler illuminates to turn on common-use switches S1 and S2, thereby sending an FM signal. A normally open switch is turned on with this signal to power on a solenoid valve MG, thereby cutting off the sending of compressed air. Thus, the solenoid value is normally not in a power-on state, so the power consumption is reduced.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is aimed at crushing concrete, etc. (generally including asphalt and other pavements, and ground) around underground pipes. The present invention relates to a device for preventing damage to stored items.

(Prior art) When crushing concrete, etc. for road construction, etc., underground pipes are investigated in advance, but due to errors in drawings, etc., it is not possible to guarantee that the underground pipes will be protected from damage.

Therefore, prior to construction, one terminal of the control device should be connected to the tip of the crushing equipment, and the other terminal should be connected to the exposed part of the buried pipe or grounded to the ground nearby, so that electricity is energized between the two terminals. When the tip of the crusher R comes into contact with the buried pipe, a relay is activated to cut off the current and automatically stop the crushing equipment, or to automatically stop the supply of compressed air, which is the power source. Devices designed to shut off are disclosed in Japanese Patent Application Laid-open Nos. 61-86189, 55-101386, and 50-
No. 1505, Japanese Utility Model Application No. 56-20777, etc.

(Problems to be Solved by the Invention) However, since both devices use polarized relays, there remain drawbacks such as non-operation, reaction, and slow operation.
Since the device keeps the valve energized at all times, it is unavoidable that power is wasted.

Moreover, since all conventional devices connect the crushing equipment, control device, and compressor with wires, the vehicle carrying the control device and compressor must be parked near the crushing site, making it inconvenient to find a parking spot. There was a drawback.

The present invention aims to provide a device for preventing damage to buried objects in crushing equipment, which eliminates the drawbacks of the above-mentioned polarized relays and can also solve the drawbacks of wired relays by adopting a wireless system.

(Means for Solving the Problem) In order to achieve the above object, the present invention makes it possible to connect the tip of a crushing device to one end of a thyristor whose both ends are connected to a power source, and connect the buried pipe side to the thyristor. The solenoid valve on the power source side of the crushing equipment can be connected to the power supply via the triac, and the circuit connecting one end of the triac and the voltage application contact of the triac is connected to the voltage application contact of the triac. A buried object damage prevention device for crushing equipment is characterized in that it is configured to close in conjunction with the closing of a normally open contact that reverses when a thyristor is in an on state.

In addition, a normally open contact that reverses when it is on is connected to the above thyristor, and this contact is connected to a radio transmitter that is activated when the contact is reversed, and this is set on the crushing equipment side, and the triac is connected to the above transmitter. It is preferable to interpose a normally open contact which is reversed by reception by a radio receiver corresponding to the device and converts the triac into a conductive state, and is set on the electromagnetic valve side.

(Function) According to the above configuration, when the tip of the crushing equipment comes into contact with the buried pipe side, the two are short-circuited through the contact resistance and voltage is applied to the thyristor, which turns on and the normally open contact is turned on. Immediately, a voltage is applied to the triac, which turns on and energizes the t-magnetic valve, which operates to stop the delivery of compressed air from the power source side.

At this time, if the reversal of the thyristor and the reversal of the triac are linked by a wireless signal, the normally open contact of the thyristor is in the ON state and at the same time the wireless transmitter installed in the crushing equipment transmits a signal, which sends a signal to the solenoid valve side. Immediately after the installed receiver receives the signal, the normally open contact is closed and voltage is applied to the triac, thereby energizing it.

(Embodiment) FIG. 1 is an overall schematic diagram of the apparatus according to the present invention, in which a detection unit and transmitter unit 2 with a transmitting antenna 3 is installed in the body of a crushing device (breaker) 1, and a detector unit with a receiving antenna 5 is installed. The control section/receiving section 4 including a solenoid valve (not shown in Fig. 2) is connected to the compressor 7 via a connecting hose 6, and the solenoid valve and the crushing device 1 are connected to a compressed air delivery hose. It is connected by 8. - On the other hand, a lead wire 9 extending from the detection section/transmission section 2 is electrically connected to the underground pipe 10. This electrical contact may be grounded to the ground, but it should be made directly to an exposed pipe end such as the end of a buried pipe exposed in a manhole near the construction site or an extension to the ground.

When the buried pipe 10 is made of a non-conductive material, it can be constructed as illustrated in FIG. 3. That is, from inside the manhole, a substantially semi-cylindrical protective conductor 11 that covers the cable, etc. (2) is inserted into at least the upper space between the pipe 10 and the cable, etc. 12, which is the object to be stored. The protective conductor 11 is inserted while being electrically connected to the same length, or if there is a gap in the outer circumference of the upper surface of the tube, the protective conductor 11 is coated at least on the upper side of the tube. It is brought into contact with the end of the conductor 11.

FIG. 2 is a circuit diagram showing the main parts of the present invention in the above device.

The detection unit/transmission unit 2 is connected to a terminal A at one end of the thyristor SCR.
is electrically connected to the crushing tip of the crushing device 1, and is also connected to the earth scraper of the power source E of approximately 9 to 12 V DC and one end S1 of the normally open switch (contact) of the photocoupler CDSL, and the thyristor and other Connect the terminal K at the end to one terminal AI of the photocoupler, and connect the voltage application terminal G of the thyristor.
is connected to the buried pipe side 10 or 11, and 1 is connected to the other terminal of the photocoupler through one pole of the power source E and the reset switch RSWI, and the FM signal transmitter PC
Connect to one pole of the power supply I, and the other end of the normally open switch S2
is connected to the earth scraper of the transmitter. Preferably, the terminal A of the thyristor and the power source are connected via a normally open contact that is closed by inserting a jack on the crushing equipment side.

The control unit/receiving unit 4 connects the AC 100V power supply to the primary side of the transformer T via the fuse F, and the secondary side connects the diode Di-D4 to the capacitor Cl-C2 and the resistor R at one end.
1, then AC/DC rectification and drop the voltage to 20-odd ■.
Furthermore, a constant voltage reduced to about DC9 to 12V by the low voltage rectifier LG is passed through the reset switch RSW2 to F.
Connect to one power supply terminal of the M signal reception JaRC2, connect the other power supply terminal of the receiver and the other end of the diode, and connect the output side of the receiver RC2 to a photocoupler CDS.
At the same time, one end S3 of the normally open switch of the photocoupler is connected to one end of the AC 100V power supply through the terminal T1 of one end of the triac SSS, and the other end S4 of this normally open switch is connected to 2 with a resistor of about Ω. It is connected to the voltage application T2 terminal of the triac via R2, and the terminal T3 at the other end of the triac is connected to the other end of the AC 100V power source via the electromagnetic valve MG.

At the start of construction, the jack on the crushing equipment side is inserted into the thyristor side, the contacts are closed, and the thyristor is placed in a conductive state.

Now, when the crushing equipment 1 and the buried pipe side 2 are in the OFF state without contact, the thyristor SCR does not operate, so the normally open switch 5l-32 also remains OFF, and the transmitter RCI
On the other hand, the receiver RC2 is connected to the IT source and is always on, but since there is no FM signal, the power is not turned on, so the photocoupler CDS2 and triac SSS
is not operated, and the solenoid valve MG is maintained in a state where compressed air is sent out to operate the crushing equipment.

In this state, the crushing work can proceed, but the crushing equipment 1
When the crushed tip of the thyristor SC contacts the buried pipe side 10 or 11, the two are short-circuited through contact resistance.
A voltage is applied to the terminal G of R, the thyristor immediately becomes energized, and at the same time the photocoupler CDSL emits light and its normally open switch S1. S2 is turned on, the circuit to the transmitter RCI is closed, and an FM signal is transmitted.

This FM signal is immediately received by the receiver RC2, the photocoupler CDS2 emits light, and the normally open switches 33 and S4
turns on, and at the same time the triac SSS terminal T
By applying a voltage to 2, the triac becomes energized,
The electromagnetic valve MG is energized and closed to shut off the compressed air delivery.

In this way, during construction in which the crushing tip of the crushing device does not come into contact with the buried pipe side, only a power source of about 9 to 12 V is used to operate the thyristor. At the same time as the crushing tip of the crushing device contacts the buried open side, the solenoid valve is energized and shut off, and the operation of the crushing device is stopped. The circuit configuration using a thyristor and a trybook allows this operation to be performed stably, and there is no delay in the start-up of the operation. Note that the compressed air remaining in the delivery hose is immediately exhausted from an exhaust hole provided with a solenoid valve.

The stop state can be canceled by pressing the normally closed reset switches RSWI and R5W2 to open the circuit once.

According to the above configuration, even if the conduction state due to contact between the distal end of the crushing device and the buried pipe side was a high resistance state of around 500 to 600 Ω, short circuit detection was possible. Moreover, according to this configuration, sensitivity adjustment is not necessary.

FIG. 4 is a circuit diagram showing an example in which a wired system is used instead of the wireless system in the above example.

Explanation of the same components as in FIG. 2 is omitted, but terminal A at one end of the thyristor SCR is connected to the crushing equipment 1, and a diode on the secondary side of the transformer of the AC100V1i source,
Capacitor, low voltage rectifier and reset switch R3W2
1 is connected to the other end of the photocoupler CDSL which is connected to the other end of the thyristor, and the t source of DC 9 to 12V is taken in from the AC 100V power supply, and the photocoupler One end Sl of the normally open switch of the CDSL is connected to the voltage application terminal T2 of the triac SSS, and the other end S2 is connected to the terminal T of one end of the triac SSS.
1 and is connected to an AC power supply.

In this way, it is possible to use wired instead of wireless, but even in this case, the power to the solenoid valve is always cut off, and it is only energized when the crushing equipment comes into contact with the buried pipe side. Become. As in the previous example, this operation is stable due to the thyristor and triac and does not operate slowly.

In the above example, if the buried pipe is made of a non-conducting material, by inserting the protective conductor into the space above the storage cable, etc. in the buried pipe, the tip of the crushing device can be inserted into the buried pipe. Even if the crushing device penetrates through the cable, the operation of the crushing device will stop as soon as it comes into contact with the external protective conductor, so there will be no damage to the storage cable, etc.

(Effects of the Invention) As described above, according to the present invention, since the TH and magnetic valves are not always energized, power consumption can be reduced, and the crushing device starts up as soon as the tip of the crushing device contacts the buried pipe side. can function stably without delay and stop the operation of the crushing equipment, and moreover, these effects can be achieved with an extremely simple device. In addition, if the contact detection unit and the device control unit are connected wirelessly, there is no need for a lead wire between the two, making work more efficient and safe, and increasing the reception range. Since the area is considerably wider than the lead wire, construction vehicles equipped with control equipment etc. can be parked freely and are not affected by geographical conditions.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of the device according to the present invention, FIG. 2 is a circuit diagram of the device according to the present invention, and FIG. 3 is a schematic perspective view showing the protected state of stored objects in the case of a buried pipe made of a non-conducting material. FIG. 4 is another example circuit diagram. Sign! - - Crushing equipment, 2 - Detection unit and transmission unit, 3 - Transmission antenna, 4 - Control unit and reception unit, 5 - Receiving antenna, 7 - Compressor, 6.8 - Hose, 1° - Buried pipe,
11... Protective conductor, 12... Storage cable, etc.
S CR-thyristor, sss...triac, M
G-・Solenoid valve, RC-・Radio device Applicant: Chuo Telecommunications Construction Co., Ltd. Figure 2

Claims (2)

[Claims] (1) The tip of the crushing equipment can be connected to one end of a thyristor with both ends connected to a power source, and the buried pipe side can be connected to the voltage application contact of the thyristor, so that the power source side of the crushing equipment The solenoid valve can be connected to a power source via a triac, and a circuit connecting one end of the triac and a voltage application contact of the triac is closed in conjunction with the closing of the normally open contact, which is reversed when the thyristor is on. A buried object damage prevention device for crushing equipment having the following configuration. (2) A normally open contact that reverses when it is on is connected to the thyristor, and this contact is connected to a radio transmitter that is activated by the reversal of the contact, and this is set on the crushing equipment side, and the triac is connected to the above-mentioned Prevention of damage to buried objects in crushing equipment as described in item 1, which is set on the solenoid valve side with a normally open contact that is reversed by reception of a radio receiver corresponding to the transmitter and converts the triac to a conductive state. Device.