JPH0142004Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Industrial application field> The present invention relates to a hanging measuring device.

<Prior Art> It is known that during tunnel excavation, changes in the cross-sectional shape of the tunnel are monitored to prevent accidents from collapsing.

In reality, various scales are used to check whether there are any changes in the height of the tunnel, etc.

<Problems to be Solved by the Present Invention> The conventional measurement techniques described above have the following problems.

(b) For large-diameter tunnels, each time a measurement is made, a worker must measure the height of the tunnel by riding on a movable scaffold or the bucket of an excavator.

Therefore, there is a risk of a fall accident for the worker, and measurement work requires a great deal of effort.

(b) Because moving scaffolding and various construction machines used for measurements block passages within the tunnel, underground traffic is likely to be obstructed.

<Purpose of the present invention> The present invention was developed in order to solve the above-mentioned problems.It is possible to ensure the safety of workers, has excellent operability, and can perform measurements without adversely affecting underground traffic. The purpose is to provide a hanging measuring device.

<Configuration of the present invention> An embodiment of the present invention will be described below with reference to the drawings.

(a) Main body Figure 1 shows a hanging measuring device 10 according to the present invention.
An example (hereinafter referred to as "measuring device 10") is shown.

Reference numeral 20 denotes a small main body, which has a plug 21 at the bottom for obtaining power from the outside, and a push button type limit switch 22 and a scale stopper 23 at the top.

The limit switch 22 is connected to a motor 40 which will be described later.
The scale stopper 23 is a manual stopper with a structure that can hold the wound scale 30 so that it does not come off inadvertently.

(b) Scale The main body 20 accommodates a scale 30 that can be wound up and unwound freely.

One end of the scale 30 is wound around a tape drum 31, and the other end of the scale 30 passes through the upper part of the main body 20 and is exposed to the outside, and a joint fitting 32 serving as a hanging means is connected to the terminal end thereof.

(c) The drive unit 40 is a motor that applies winding force to the tape drum 31 via an intermediate gear or the like.

In the present invention, a storage battery is not included as a power source for driving the motor 40 in order to reduce the weight of the measuring device 10.

Instead, the power transmission cord 24 extends from the ground.
A cylindrical outlet 25 is attached to the end of the main body 20, and this is inserted into the plug 21 on the main body 20 side to utilize the ground power source.

The motor 40 is driven and stopped by switching the limit switch 22.

34 is a main shaft that supports the tape drum 31, and a gear wheel 33 is fixed on the same axis.

(d) Release device A claw 51 with one end fixed to a claw shaft 50 is swingably arranged near the gear wheel 33.

The pawl 51 and the gear wheel 33 constitute a ratchet mechanism capable of regulating the rewinding of the scale 30.

This ratchet mechanism can be switched remotely using the following structure.

An example of this switching structure will be described with reference to FIGS. 2 and 3. Reference numeral 52 denotes a release lever, which is fixed to a claw shaft 50 on which the claw 51 is fixed.

A storage chamber 60 and a built-in switch 70 are provided on both sides of the release lever 52.

The storage chamber 60 accommodates therein a bullet 61 that extends in a direction crossing the release lever 52, and a spring 62 that contacts the side surface of the bullet 61 and biases it downward.

Reference numeral 63 denotes a spring stretched between the storage chamber 60 and the release lever 52, and the contractile force of the spring 63 always acts in the direction of retracting the bullet 61 via the release lever 52.

The bullet 61 can be ejected and retracted by a horizontal solenoid 64 arranged so that the tail end side of the bullet 61 can be pushed rightward in the drawing, and a vertical solenoid 65 arranged so that the side surface of the bullet 61 can be pushed upward. It is composed of

The horizontal and vertical solenoids 64 and 65 have a structure in which a rod at the center instantaneously pops out in one direction when energized.

Then, the horizontal solenoid 64 moves the bullet 61 to the second position.
When the release lever 52 is moved from the state shown in the figure to the right side of the drawing as shown in FIG. 3, the release lever 52 swings clockwise.

As a result, the pawl 51 shown in FIG. 1, which is integral with the release lever 52, comes off the gear wheel 33 and releases the ratchet mechanism.

At this time, as shown in FIG. 3, the pushed out bullet 61 receives the downward force of the spring 62 and is forcibly dropped into the recess formed at the lower part of the storage chamber 60, and is released from the storage chamber 60. It will remain stuck out.

Further, when the vertical solenoid 65 is activated, it pushes back the bullet 61 in the state shown in FIG. 3 upwardly against the spring force of the spring 62.

As a result, the release lever 52, which has lost its support member, receives the contraction force of the spring 63 and swings counterclockwise to its original position as shown in FIG. 2 while retracting the bullet 61.

When the release lever 52 swings counterclockwise, the pawl 51 shown in FIG. 1 engages the gear wheel 33 to form a ratchet mechanism.

In order to reduce the weight of the measuring device 10, the horizontal solenoid 64 is powered by a built-in battery, and the vertical solenoid 65 uses an external power source in the same way as the motor 40.

(E) Motor circuit switching means The motor 40 not only functions when winding up the scale 30, but also has a braking function to suppress the descending speed of the measuring device 10.

In order to provide the motor 40 with a braking function, a braking circuit incorporating a resistor is formed separately from the motor drive circuit, and both circuits are switched by a built-in switch 70 disposed on one side of the release lever 52.

The braking circuit is switched when the release lever 52 swings clockwise, that is, when the ratchet mechanism is released.

By switching to the braking circuit, it is possible to generate a resistance force when the motor 40 rotates in reverse, thereby preventing the measuring device 10 from falling suddenly.

(F) Receiving Circuit The main body 20 is equipped with a receiving section 80 for remotely controlling the rewinding of the scale 30.

This receiving section 80 is electrically connected to the horizontal solenoid 64.

Inside the tunnel, various types of light and noise are being generated due to the construction work.

Therefore, in order to prevent malfunctions due to the influence of such sound and light, it is preferable to use a known sensor that operates by receiving light emitted multiple times from a transmitter (not shown) in the receiving section 80.

(G) Automatic winding stop mechanism The automatic winding stop mechanism is a mechanism that automatically stops winding when a certain amount of scale 30 has been wound.

An example of an automatic winding stop mechanism will be explained based on FIG. 4.

A stopper arm 3 is installed near the end of the scale 30.
5, the stopper arm 35 forcibly pushes down the limit switch 22 at the top of the main body 20 as the scale 30 is wound up.

Then, the power supply circuit of the motor 40 is cut off,
Winding of the scale 30 automatically stops.

<Effect> Next, how to use the measuring device will be explained.

(B) Setting up the measuring device As shown in Figure 1, attach the joint fitting 36 to the tunnel ceiling where measurement is to be performed in advance.

Next, the joint fitting 3 at the end of the scale 30
2 to the joint fitting 36 on the tunnel ceiling to hang the measuring device 10.

At this time, the ratchet mechanism within the measuring device 10 is engaged and prevents the measuring device 10 from descending.

(b) Descending A descending signal is sent from the ground to the measuring device 10 suspended from the tunnel ceiling.

Then, the receiving section 80 of the measuring device 10 receives this signal, and based on this received signal, the horizontal solenoid 64 is activated to eject the bullet 61 as shown in FIG. is released.

When the ratchet mechanism is released, the measuring device 10 descends under its own weight.

At the same time the ratchet mechanism is released, a built-in switch 70 of FIG. 3 switches to the braking circuit.

Therefore, the measuring device 10 slowly descends at a constant speed while letting out the scale 30.

(c) Measurement When the measuring device 10 descends to near the floor of the tunnel while letting out the scale 30, the measuring device 1
0 by hand and operate the scale stopper 23 to restrain the scale 30 from being extended.

Then, the length from the tunnel ceiling to the measuring device 10 is read on the measuring device 10 side.

Furthermore, a short distance from the tunnel floor to the measuring device 10 is measured using a known fixture, and the previous measured value from the tunnel ceiling to the measuring device 10 is added to obtain the tunnel cross-sectional diameter.

Note that the ratchet mechanism remains released during the measurement work.

(d) Ascent After completing the measurement work, insert the outlet 25 of the power transmission cord 24 extending from the ground into the plug 21 of the measuring device 10.

Then, when the limit switch 22 on the top of the measuring device 10 is manually pressed, the energizing circuit of the motor 10 is connected and winding of the scale 30 is started.

The measuring device 10 receives power from the motor 40 from the ground and continues to ascend while winding up the scale 30.

(E) Standby When the winding of the scale 30 approaches the end, the stopper arm 35 pushes down the limit switch 22 as shown in FIG.

As a result, the energizing circuit of the motor 40 is cut off and winding of the scale 30 is stopped.

At the same time, the ratchet mechanism is engaged by actuation of the vertical solenoid 65 shown in FIG. 2 to prevent the measuring device 10 from descending.

After the measuring device 10 is placed on standby at a predetermined position, the power transmission cord 24 is pulled from the ground and the outlet 25 is unplugged from the plug 21.

If you want to measure the cross-sectional diameter of the tunnel at the same measurement point at a later date, measure as described above.

<Effects of the present invention> Since the present invention is as explained above, the following effects can be obtained.

(b) Measuring equipment can be remotely controlled from the ground.

Therefore, measurement work can be performed safely and easily even in large-diameter tunnels.

(b) The power source for driving the motor built into the measuring device is
It can be obtained from the ground by connecting a lightweight power transmission cord.

Therefore, the weight of the measuring device can be reduced to the extent that a storage battery for driving the motor is not built into the measuring device, and the motor can also have a small capacity due to the weight reduction of the measuring device.

(c) Since it is a hanging type, the measuring device can be lowered only when taking measurements, and when measurements are not needed, it can be hoisted up to the ceiling of the tunnel and left on standby.

Therefore, it does not interfere with the passage of construction machinery or other work.

(d) The measuring device automatically stops winding when the scale winding amount reaches a certain level.

Therefore, breakage of the scale and falling of the measuring device due to excessive winding of the scale can be prevented.

[Brief explanation of the drawing]

Figure 1: Overall view of the device according to the present invention, Figure 2:
Explanatory diagram of the arrangement of horizontal and vertical solenoids, Figure 3: Explanatory diagram when the bullet is flying out, Figure 4
Figure: An explanatory diagram of the installation state of the stopper arm. 20: Main body, 30: Scale, 40: Motor,
50: Claw shaft, 61: Bullet, 64: Horizontal solenoid, 65: Vertical solenoid.

Claims (1)

[Scope of claim for utility model registration] A scale with a fixing fitting on one end, a tape drum inside the main body that stores the other end of the scale so that it can be wound up and taken back, and a power supply that is powered by a power transmission cord extending from the ground. a gear wheel that transmits the rotation of the motor to the tape drum; a receiver that receives standby and lowering signals from the transmitter; A hanging measuring device equipped with a release device that releases the brake and a stop device that automatically stops scale winding.