JPS605967A - Positioning of hydraulic jack by optical sensor - 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 The present invention relates to a method for stopping the expansion and contraction of a hydraulic jack in traveling construction methods and the like.

For example, the steel truss/traveling construction method is applied to construct the steel roof of a large space such as two gymnasiums.
As shown in FIG. 1, for a rail 1 for traveling or towing a towed object.

Reaction holes at predetermined intervals 2. ... has been drilled,
The jack is "retracted" by engaging the opening/closing lock pawl 4a of the locking device 4 provided at the tip of the cylinder 3a of the hydraulic jack 3, and the towed object connected to the other end of the jack 3. 5 is towed in a predetermined stroke in an inchworm-like manner.

Conventionally, when the cylinder 3a is extended or retracted, the locking pawl 4a reaches the position of the reaction force hole 2, and human visual inspection is required to stop the locking pawl 4a.

A signal was sent to the control room to stop cylinder 3a.

However, this was extremely inefficient and was one of the factors that hindered labor-saving efforts.

The present invention was made in view of the above circumstances, and its gist is to open and close the frame of a locking device provided at the tip of a jack cylinder that engages with a reaction hole drilled in a rail. The amplifier inside the optical sensor is determined by whether or not the reflection point of the optical sensor, which is made up of a light emitting part and a light receiving part, are oriented toward the side wall surface of the rail installed in the locking pawl of the formula, with respect to the reaction hole. The stopping position is determined based on the difference in increase or decrease of

This will be explained in detail below based on the drawings.

FIG. 2 shows a schematic diagram of a jack positioning device embodying the present invention, in which optical sensors 6 are installed at two locations on the front and back of a frame 8 of the locking device. The optical sensor 6 is composed of a light emitting part a and a light receiving part as shown in FIG. The light receiving section receives light.

Note that the reflecting object 7 is a side wall surface of the rail 1 or an inner web wall surface.

Turn on when reflected light is received, turn off when no reflected light is received.
Then, the ON and OFF states are determined by the front and rear two sensors, and when both sensors are in the OFF state, the jack 3 is stopped by setting the solenoid of the hydraulic jack 3 to neutral.

Note that the OFF state is as shown in FIG.

Since the distance of one reflection is determined by the increase or decrease of the amplifier inside the optical sensor 6, when it comes to the position of the reaction force hole 2 of the rail 1, the distance 1ii1t to the third reflection object 7 increases, and the light reaches the light receiving part. It is in a state where it no longer receives light.

On the other hand, FIG. 3 shows the ON state of light reception. The reaction hole 2 is as shown in FIG.

The locking holes are symmetrical, so the optical sensor
The accuracy of positioning can be further improved by installing 2 pieces of 6 on the left and 2 on the right.

As described above, according to the method of the present invention, one mouth and four claws are used.
It is possible to automatically detect that a matches the position of the reaction force hole 2, and use that signal to stop the jack 3.1 For example, as shown in FIG.
．． By doing as shown in the flowchart shown in regard to 2, automation and labor saving will be achieved, and in practice, various effects as listed below will be achieved.

(1) Compared to human instructions, there is no time lag, so positioning can be done in a short time.

(2) No more positioning corrections.

(3) What conventionally required 2 to 4 people can be done unattended.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a traveling construction method as an example that requires the suspension of a hydraulic jack, Fig. 2 is a schematic diagram of a device implementing the present invention, Figs. 3 and 4 are explanatory diagrams of the position detection principle of the present invention, FIG. 5 is a detailed explanatory diagram of the present invention, and FIG. 6 is a flow chart diagram of the method of the present invention. DESCRIPTION OF SYMBOLS 1...Rail, 2...Reaction hole, 3...Hydraulic jack, 4a...Lock pawl, 5...Towed object, 6...
... Optical sensor, 7... Reflective object, 8... Frame of locking device, a... Light emitting section, b... Light receiving section - Of course! Buoy (Continued from page 1 0 Inventor: Junji Matsunaga Inside Takenaka Corporation Osaka Main Office, 4-27 Honmachi, Higashi-ku, Osaka City)

Claims (1)

[Claims] A light-emitting part oriented toward the side wall surface of the rail, which is installed in an opening/closing lock pawl in the frame of a locking device provided at the tip of a jack cylinder that engages with a reaction hole drilled in the rail; Hydraulic pressure using an optical sensor, characterized in that the stopping position is determined by the difference in increase or decrease of the amplifier inside the optical sensor due to the coincidence or mismatch of the reflection point of the optical sensor constituted by a light receiving part with the reaction hole. How to position the jack.