JPS585255Y2 - Ladder tip approach distance control device for ladder vehicles with digital display device - Google Patents

Description

[Detailed description of the invention] This invention provides a digital display of the approach status of a fire-fighting ladder vehicle to a building at the tip of the ladder from moment to moment, and also indicates that the approach of the tip of the ladder to the building is close to the permissible limit. This invention relates to a ladder tip approach distance control device for a ladder vehicle equipped with a digital display device that issues an alarm and automatically stops the operation of the ladder when a permissible limit is reached.

In a telescopic ladder vehicle, work safety cannot be ensured unless the degree of extension and undulation of the ladder and the load applied thereto are within permissible limits, which is extremely dangerous.

However, in conventional ladder cars, the degree of extension of the ladder. Currently, there is no mechanism for measuring and displaying the degree of undulation and the load applied thereto, and it is left up to the intuition of the working tool.

It has been found that a structure as shown in FIG. 1 is extremely effective as a means of solving the defects existing in ladder vehicles.

In FIG. 1, a swing mechanism 3° support member 4. For example, a three-stage telescoping ladder 21 is installed via the loading platform 5.
．． Load 22.23.

The lower end of the cylinder 7 is located at a predetermined position at the rear end of the vehicle 1, and the rod 71 of the cylinder 7 has one end connected to the support member 4.
The opposing lower ends are pin-coupled to a predetermined position of the pin-coupled loading platform 5, and the ladder body is raised and lowered by advancing and retreating the rod 71 of the cylinder 7.

A cylinder 8 is installed on the loading platform 5, and a pulley 16 is installed at the tip of a rod 81 of the cylinder 8.

Pulleys 161 are also installed at the front and rear ends of the bottom of each ladder 21, 22, and 23.
- 166 are attached, and a wire 9, one end of which is fixed to the pulley 16, is hung between the pulleys 161-166.

The turning mechanism 3 is mounted so as to be able to turn left and right about a fulcrum 31 with respect to the traveling direction of the automobile 1.

The above configuration is that of a known ladder vehicle, but in the above means, the undulation degree detector 12 is mounted at a predetermined position on the mounting member 4.
will be established.

The undulation detector 12 is constructed as shown in FIG.

The undulation detector 12 and a pulley 25 are pivotally connected to a shaft 26, and a chino 28 is hung between the pulleys 25 and 24.

The pulley 24 and the undulating rotating shaft 6 are pivotally connected to a shaft 27.

Note that 29 is a bearing.

The rotation angle of the rotating shaft 6 due to the ups and downs of the ladder body 2 is expressed as the axis 27. Pulley 24. Chen 28. The undulation degree detector 12 is connected via the pulley 25.
The degree of undulation is detected by telling the

Reference numeral 13 denotes a ladder extension degree detector fixed to a pulley provided on the lower ladder 21, and the pulley is connected to a cylinder 8 for extending the ladder body.
advancement of the rod 81.

Since the ladder body 2 rotates in a predetermined direction by retracting and unwinding the cheno 9, the number of revolutions of the pulley changes the ladder body 2.
Detects expansion and contraction dust.

Reference numeral 14 indicates mounting: - A load detector consisting of, for example, a hydraulic cylinder is provided on the frame 5, and is configured so that the load of the ladder body 2 is received at the tip of the rod of the hydraulic cylinder, and the load is detected in the form of hydraulic pressure. This is what I did.

With this configuration, the undulation degree detector 12 can always accurately detect the degree of undulation of the ladder body, the ladder extension degree detector 13 can accurately detect the degree of extension of the ladder, and the load detector 14 can always accurately detect the load applied to the ladder. be.

However, even with this configuration, operating the cylinders 7 and 8 to position the tip of the ladder at a desired position relative to the side of the building being burned, for example, must be done in a short period of time, especially at night, in the case of an emergency. is difficult.

If the tip of the ladder collides with the side of a building or is placed in an unacceptable area, there is a risk of not only causing a serious accident, but also seriously interfering with firefighting operations.

This invention detects when the distance between the tip of the telescoping ladder and the building reaches a predetermined distance and issues an alarm, and automatically stops the ladder when the approach distance reaches the permissible limit. By providing such an arrangement, it is intended to eliminate the difficulties present in telescoping ladder vehicles as described above.

The present invention will be explained according to the embodiment shown in FIGS. 3 and 4.

First, the principle of the present invention will be explained with reference to FIG.

1 is a ladder car, and A is the 1st car mounted on ladder car 1.
In the ladder body illustrated in the figure, B indicates a building.

An ultrasonic transmitter and a receiver are provided at the tip of the ladder body A, and after the ultrasonic waves emitted from the ultrasonic transmitter hit the opposing surface of the building, they are reflected and received by the receiver.

In that case, L is the distance between the tip of ladder body A and the opposing surface of building B, ■ is the speed of the ultrasonic wave, and t is the time from when the ultrasonic wave is transmitted from the transmitter until it is received by the receiver. Letting time be 2L=v, t,'', L=+v, where t is time and a voltage converter converts it into voltage.

This makes it possible to automatically detect the ever-changing distance between the tip of the ladder and the facing surface of the building, and when it detects that the distance is close to the permissible limit, an alarm is issued and It is possible to automatically stop the operation of the ladder when

A specific embodiment of the present invention based on such a principle will be described with reference to FIG.

The present invention includes a detection unit that detects the ever-changing distance between the tip of the ladder and the facing surface of the building, and a digital display of the detection results by the detection unit, so that the distance described above is close to the permissible limit. It consists of a display section I equipped with an emergency stop mechanism that issues an alarm at certain times and automatically stops the operation of the ladder when a permissible limit is reached.

The detection part is located at the tip of the ladder, i.e. at 166 in Figure 1.
The display section (3) is housed in the ladder vehicle 1, for example, at the position indicated by the dotted line.

The detection section was constructed as follows.

For example, an oscillator 101 that oscillates at intervals of about 100 mm/sec is connected to a timing pulse generator 102. It is connected to a transmitter 109 via a pulse modulator 103.

On the other hand, the output side of the timing pulse generator 102 is connected to the input side of the amplification detector 104 and the time/voltage converter 105, respectively, and the output side of the pulse modulator 103 is connected to the input side of the amplification detector 104 and the time/voltage converter 105, respectively.
049 hours, ' is transmitted to the scanner 106 via the pressure transducer 105.
Connect to the input side of the

The input side of the scanner 106 is connected to the power supply 111, and the output side is an analog-to-digital converter 107 for converting an analog signal into a digital signal. It is connected to the digital display section 112 of the display section I via the amplifier 108.

(2) On the other hand, the output side of the receiver 110 is connected to the amplification detector 104.

The transmitter 109 and the receiver 110 are rotatably attached to the support member, and are always maintained in a vertical position due to gravity, regardless of the degree of undulation of the ladder body. always remain parallel.

Even if there are some unevenness on the opposite side of the building, the transmitter 1
At least a portion of the ultrasonic beam transmitted from the ultrasonic beam 09 is set to be reflected by the opposing surface and received by the receiver 110.

The display section ■ has an amplifier 113 . 'J tray 14 series circuit and amplifier 115,
It consists of series circuits of relays 116 connected in parallel.

The relay 114 is set to be activated by its output when the digital display section indicates a certain distance close to the permissible limit, and the relay 116 is set to be activated by the output when the digital display section displays a certain distance close to the permissible limit. ing.

In such a configuration, the ladder body A is extended and raised while the oscillator 101 is in operation.

The oscillator 101 oscillates at an interval of about lQQmm/sec, and the oscillation wave is given to the timing pulse generator 102, and via the timing pulse generator 102, the pulse modulator 103. It is given to the amplification detector 104 and the time/voltage converter 105 as a start signal.

In the pulse modulator 103, the timing pulse generator 102
The oscillation waves that are continuously input from the transmitter 109 are modulated into pulses and transmitted from the transmitter 109 .

The transmitted pulsed ultrasonic waves are reflected by the opposing surface of the building B and received by the receiver 110.

On the other hand, the output of the pulse modulator 103 is amplified by the amplification detector 104 and then inputted to the voltage converter 105 for a known time, and the elapsed time due to the voltage is counted using the input time as a starting point.

The ultrasonic waves emitted from the transmitter 109 are reflected by the opposing surface of the building B, received by the receiver 110, amplified by the amplification detector 104, and then input to the time/voltage converter 105.

The voltage converter 105 counts the elapsed time from the above-mentioned starting point in the form of a voltage level using a known method, but the counting is stopped when a reflected wave is input.

The voltage level is determined by a known analog-to-digital converter 107 according to the timing set by the scanner 106.
After being converted into a digital signal, the amplifier 108
The signal is amplified and digitally displayed on the digital display section 112.

Since the oscillator 101 outputs oscillation waves at intervals of 100 mm/sec, if the display unit on the digital display section 112 is set to 0.1 m, the distance between the tip of the ladder body A and the opposing surface of the building is in the above unit. If the change is more than 0.1
The digital display changes in time units of seconds.

The output of the digital display section 112 is given to relays 114 and 116 via amplifiers 113 and 115, and if the digital display section 112 displays a display close to the permissible limit, the output causes the relay 114 to operate, as shown in the figure. When an alarm or the like is sounded and a number corresponding to the permissible limit is displayed, the output activates the relay 116, inputs it to the known hydraulic control circuit of the cylinder 7 or 8 of the ladder body, or both, and activates the cylinder 7 or 8. Or stop the operation of both.

As described above, according to the present invention, the problems that exist in this type of ladder truck as described above can be easily solved.

[Brief explanation of drawings]

Figure 1 is a front view showing an improved example of a ladder car;
2 is an enlarged cross-sectional view taken along the line AA' in FIG. 1, FIG. 3 is a front view for explaining the principle of the present invention, and FIG. 4 is a circuit diagram showing an embodiment of the present invention. 1... Ladder car, B... Building, D
...Detection section, ■...Display section, 105.
...Time, voltage converter, 107...Analog, digital converter, 1-09...Transmitter,
110...Receiver, 112...Digital display section, 114°116...Relay

Claims (1)

[Scope of utility model registration request] Consisting of a detection section and a display section, the detection section is attached to the tip of the ladder, and includes a transmitter that transmits ultrasonic waves, and a receiver that receives the ultrasonic waves transmitted from the transmitter after reflecting them on the opposite surface of the building. , Time to detect the time required from the time when the ultrasonic wave is transmitted from the transmitter to the time when it is received by the receiver in the form of a voltage level, a voltage converter, and an analog/digital device that converts the detected voltage level into a digital signal. The display section is equipped with a digital display section that displays digital signals transmitted from the analog and digital converters of the detection section, and a relay that is connected in parallel to the output side of the digital display section, and one of the relays is connected in parallel to the output side of the digital display section. One relay is activated to issue an alarm when the display on the digital display is within a certain set of values close to the allowable limits, and the other relay is activated to issue an alarm when the values are within the allowable limits. A ladder tip approach distance control device for a ladder vehicle, comprising a digital display device configured to stop the ladder.