JP7091415B2 - Drilling equipment for lightweight cellular concrete panels - Google Patents

Description

The present invention relates to a drilling device for lightweight cellular concrete panels.

In a lightweight cellular concrete (ALC) panel widely used as a precast type building material, various embedded metal fittings are embedded in the panel in advance (see Patent Document 1). In the construction site where the ALC panel is used, drilling is frequently performed to expose the opening (nut portion) of the embedded metal to the surface of the panel.

However, the position of the embedded metal in the ALC panel in the depth direction is not always according to the design value, and usually there is some variation. Therefore, when the position of the embedded metal in the depth direction is shallower than the design value, there is a risk that the cutting blade of the drilling device collides with the embedded metal and both the embedded metal and the drilling device are damaged. On the other hand, when the position of the embedded metal in the depth direction is deeper than the design value, there may be a problem that the opening of the embedded metal is insufficiently exposed.

The position error from the design value due to the variation in the depth position of the embedded metal in the ALC panel is not predictable in advance, and therefore, the position in the depth direction should be accurately detected by drilling. Is almost impossible at present with known techniques. Therefore, in the above-mentioned drilling process for the ALC panel, in order to avoid damage to the drilling equipment itself due to the collision between the cutting blade of the drilling device and the metal fitting, the safety width before the cutting blade reaches the embedded metal fitting. The processing method to stop the drilling with a minute left was exclusively selected.

As a technique intended to prevent the cutting blade of the drilling device from colliding with the embedded hardware in this way, the machining load during drilling is monitored, and the machining load is compared with the overload determination value of the tool. A drilling method for determining an abnormality is known (Patent Document 2). However, even with this method, it is difficult to reliably stop the operation before the cutting blade of the drilling device actually contacts the tip of the embedded metal. Further, since it is necessary to perform the drilling process of the ALC panel not only in the factory where the panel is manufactured but also in the individual construction site, in that case, an expensive punching device equipped with the above control mechanism is used. In many cases, it was not possible, and it was required to be able to perform the same operation control with a simpler and cheaper device.

In addition, by creating a cavity in advance at the tip of the embedded hardware to be embedded in the ALC panel, it is detected that the cutting blade of the drilling device has reached the cavity due to the reduction in the machining load during drilling. As a result, a drilling method has also been proposed in which the cutting blade of the drilling device stops its operation before it actually comes into contact with the tip of the embedded metal (Patent Document 3). However, since this method is a process that requires special processing in which the above-mentioned "cavities" are formed in advance at the manufacturing stage of the ALC panel, a general-purpose ALC panel that has not been specially processed is required. It is not a technology that can be applied to all.

Japanese Unexamined Patent Publication No. 2000-248636 Japanese Unexamined Patent Publication No. 1-10909 Japanese Unexamined Patent Publication No. 2009-168768

According to the present invention, in the drilling process for exposing the opening of the embedded metal embedded in the ALC panel to the panel surface, the depth is appropriate regardless of the variation in the position of the embedded metal in the depth direction. It is a drilling device that can stop drilling and prevent damage to embedded hardware and the device itself due to overcutting, and is used not only in factories that manufacture panels but also by using ALC panels. It is an object of the present invention to provide a drilling device having a simple structure that can be easily introduced into a construction site.

The present inventors design a power transmission unit that transmits a shaft rotational force from a power source motor to a drilling tool by a belt drive method so that idling occurs when a torque load exceeding a predetermined value is applied. As a result, we came up with the idea that the above problems could be solved, and completed the present invention. Specifically, the present invention provides the following.

(1) A drilling device for a lightweight bubble concrete panel, the drilling tool having a cutting blade at the tip of a rotating shaft, a power source motor that exerts a driving force for rotating the rotating shaft, and the driving force. The power transmission unit includes a power transmission unit that transmits to the drilling tool, and the power transmission unit comprises a belt drive type power transmission mechanism that rotates the rotation shaft by a drive belt, and the drive belt is the rotation. A drilling device that is suspended so that when the torque load received from the shaft exceeds a predetermined value, idling due to slipping occurs, so that the transmission of a part or all of the driving force is cut off.

According to the drilling device (1), in the drilling process for exposing the opening of the embedded metal embedded in the ALC panel to the panel surface, regardless of the variation in the position of the embedded metal in the depth direction. , The drilling can be stopped at an appropriate depth to prevent damage to the equipment due to overcutting. Further, since the structure does not require complicated electronic control or the like, it is possible to obtain a drilling device having a simple structure that can be easily introduced into a construction site using an ALC panel.

(2) Further, a clutch or a torque limiter is provided as a power transmission cutoff mechanism that automatically cuts off the transmission of a part or all of the driving force when the torque load exceeds a predetermined value in (1). The drilling device described.

According to the drilling device of (2), damage to the embedded metal due to overcutting in the depth direction can be minimized during the operation of the drilling device of (1).

(3) The rotating shaft is held by a rotating shaft holding portion that fixes the horizontal position of the rotating shaft.
The drilling device according to (1) or (2), wherein the rotating shaft holding portion is configured so as not to apply a resistance load to the vertical vertical movement of the rotating shaft.

According to the drilling device (3), for some reason, the cutting blade is placed in the embedded metal piece 20 before the shaft rotation of the rotating shaft is stopped by the above-mentioned control mechanism provided in the drilling device of (1) or (2). Even when they come into contact with each other, damage to the cutting blade and the like can be minimized by stopping further progress of the cutting blade and the rotary shaft vertically downward.

(4) The drilling device according to any one of (1) to (3), comprising a position sensor that detects a vertical upward positional displacement of the rotating shaft.

According to the drilling device (4), as an emergency response when an abnormal movement of the rotating shaft is detected, the operation of the power source motor 2 is stopped to overcut in the depth direction during the operation of the drilling device. Damage to the embedded hardware due to the above can be more reliably minimized.

(5) A method for drilling a lightweight cellular concrete panel, wherein the surface of the lightweight cellular concrete panel is drilled using the drilling device according to any one of (1) to (4).

According to the method of drilling a lightweight cellular concrete panel according to (5), the drilling operation of the lightweight cellular concrete panel performed in each construction site can be performed by an apparatus that is simple and inexpensive and easy to introduce.

According to the present invention, in the drilling process for exposing the opening of the embedded metal embedded in the ALC panel to the panel surface, an appropriate depth is applied regardless of the variation in the position of the embedded metal in the depth direction. It is a drilling device that can stop drilling and prevent damage to the embedded hardware and the device itself due to overcutting, and is not only used in factories that manufacture panels, but also by using ALC panels. It is possible to provide a drilling device having a simple structure that can be easily introduced into a construction site to be carried out.

It is a front view of the drilling apparatus for the lightweight cellular concrete panel of this invention. It is a side view of the drilling apparatus for the lightweight cellular concrete panel of this invention. It is a perspective view which shows an example of the embedded metal fittings embedded in the lightweight cellular concrete panel which is the object of processing of the drilling apparatus for the lightweight cellular concrete panel of this invention. It is a schematic diagram which shows the embodiment of the drilling method of the lightweight cellular concrete panel of this invention.

Hereinafter, preferred embodiments of the "drilling device for lightweight aerated concrete panels" of the present invention and the "drilling method for lightweight aerated concrete panels" performed using the same will be described. However, the present invention is not limited to the following embodiments.

<Punching device for lightweight cellular concrete panels>
The perforation device 10 shown in FIGS. 1 and 2 is an example of a preferred embodiment of the perforation device for a lightweight cellular concrete (ALC) panel of the present invention (hereinafter, also simply referred to as “perforation device”). As shown in each of the above figures, the drilling device 10 is a drilling device including at least a drilling tool 1, a power source motor 2, and a power transmission unit 3. It is preferable that each of the above components is integrated by being joined to a substrate portion 4 including a mounting substrate 41, a leg portion 44, etc. as an overall configuration.

[Punching tool]
As shown in FIGS. 1 and 2, the drilling tool 1 is a cutting tool including a rotating shaft 11 and a cutting blade 12 joined to the tip of one of the rotating shafts 11. The drilling tool 1 drills the ALC panel by pressing the cutting blade 12 against the surface of the ALC panel with a predetermined force while rotating the rotating shaft 11.

Further, in the drilling device 10, the rotary shaft 11 of the drilling tool 1 is held by the rotary shaft holding portions 42 and 43 as shown in FIGS. 1 and 2. Then, these rotating shaft holding portions 42, 43 fix the horizontal position of the rotating shaft 11, but do not give a resistance load to the vertical vertical movement of the rotating shaft 11, that is, the rotating shaft 11 Is preferably in a holding mode that does not constrain the movement in the vertical direction. With such a holding mode, only the weight of the drilling tool 1 is applied to the traveling direction (vertically downward) of the cutting blade 12 during the drilling operation. By adopting such a holding mode close to free drop, for example, even when the cutting blade 12 comes into contact with the embedded metal fitting 20 before the shaft rotation of the rotating shaft 11 is stopped, the cutting blade 12 and the rotating shaft 11 are held. Further downward travel can be stopped and damage to the embedded hardware and cutting blades can be minimized.

[Power source motor]
As the power source motor 2, a known electric motor can be used without particular limitation as long as it can generate a driving force for rotating the rotating shaft 11.

[Power transmission unit]
The power transmission unit 3 is a belt drive type power transmission mechanism that transmits the driving force generated by the power source motor 2 to the drilling tool 1. As shown in FIG. 1, the power transmission unit 3 is composed of drive rollers 31 and 32 and a drive belt 33. The above-mentioned driving force generated by the power source motor 2 is transmitted from the drive shaft 21 of the power source motor 2 to the rotating shaft 11 of the drilling tool 1 via the drive roller 31, the drive belt 33, and the drive roller 32. Be transmitted.

When the torque load received by the drive belt 33 from the rotating shaft exceeds a predetermined value in the process of drilling work, the power transmission unit 3 constituting the drilling device 10 means that the embedded hardware 20 and the cutting blade 12 have a torque load equal to or higher than a predetermined value. When the tip comes into contact, the transmission of part or all of the driving force is cut off by idling due to slipping at the interface where the driving belt 33 and the rotating shaft 11 of the drilling tool 1 are in contact with each other. The drive belt 33 is hung.

In order to prevent the belt drive type power transmission mechanism from idling due to slipping of the drive belt 33 with respect to a torque load of a predetermined value or more, for example, the drive belt 33 may be made of an elastic rubber material or the like. By appropriately setting the tension generated by the tension of the rubber material when hanging between the drive rollers 31 and 32, the torque load that causes idling is adjusted to an arbitrary predetermined value. can do. Alternatively, by appropriately setting the frictional force between the belt and the driving rollers 31 and 32, the torque load at which the above-mentioned idling occurs can be adjusted to an arbitrary predetermined value.

Further, in the power transmission unit 3, in addition to the adjustment that the power transmission mechanism of the belt drive system is idle due to the slip of the drive belt 33, a torque load of a predetermined value or more is further applied to the rotating shaft 11 of the drilling tool 1. In some cases, it is more preferable to provide a power transmission cutoff mechanism (not shown) that automatically cuts off the transmission of a part or all of the driving force. The power transmission cutoff mechanism is specifically a clutch or a torque limiter, which is a known mechanical mechanism that cuts off the transmission of the driving force when the above torque load exceeds a predetermined value. Can be done. The above-mentioned "predetermined value" relating to the torque load on which these power transmission cutoff mechanisms are operated is about the same as the above-mentioned torque value in which the belt drive type power transmission mechanism idles due to the slip of the drive belt 33. It is preferable to set it as. As a result, the safety device of the drilling device 10 becomes redundant, and the safety during operation can be further enhanced.

Further, the above-mentioned power transmission cutoff mechanism can incorporate the function as a mechanism for electrically controlling the power source motor 2, but in order to have a simpler configuration, the power transmission is performed as a mechanical control mechanism. It is preferable that the unit 3 is installed. As a result, when the power of the motor constituting the power transmission unit 3 is relatively small, it is possible to prevent the motor from being damaged because it cannot withstand the cutting resistance and the pushing force in the vertical direction.

[Other mechanisms]
The drilling device 10 may further be provided with a position sensor (not shown) that senses the vertical upward displacement of the rotary shaft 11 of the drilling tool 1. The position sensor is a drilling device, for example, by stopping the operation of the power source motor 2 as an emergency response when the fluctuation amount or the fluctuation speed of the position of the top of the rotating shaft 11 exceeds a predetermined threshold value. The safety of the operation of 10 can be further enhanced.

<Drilling method for lightweight cellular concrete panels>
In the method for drilling a lightweight cellular concrete panel of the present invention, for example, as shown in FIG. 4, the surface of the ALC panel is drilled in accordance with the position of the opening of the embedded metal piece 20 embedded inside the ALC panel 30. How to do it. This method of drilling a lightweight cellular concrete panel can be performed in a preferred embodiment by using the drilling device (drilling device 10) of the present invention described in detail above.

<Embedded hardware>
As shown in FIG. 3, the embedded metal fitting 20 preferably has a cap 203 attached around the opening of the main body 201 of the embedded metal fitting to prevent the inflow of slurry during panel manufacturing. .. The main body 201 of the embedded metal may be a metal that is used by exposing the opening (nut portion) to the panel surface in a state of being embedded in the inside of the ALC panel 30 or the like in advance, and is disclosed in the above-mentioned Patent Document 1. Various other known embedded metal fittings, including the embedded metal fittings, are subject to the drilling process by the apparatus and method of the present invention without any particular limitation. The cap 203 is preferably made of a resin that can be easily perforated, but by forming the cap portion with a so-called rubber magnet such as an anisotropic rubber magnet, a magnetic sensor can be used to determine the horizontal position of the embedded metal. You can also make it easier to search.

<Lightweight cellular concrete panel (ALC panel)>
The ALC panel 30 is obtained by injecting a material slurry in a state where the embedded metal fitting 20 is fixed to the reinforcing bar 301 arranged in the panel, foaming and hardening the material, and further, after a lapse of a desired time. It can be obtained by taking out the semi-plastic body from the mold, cutting it to a desired thickness with a piano wire or the like, charging it in an autoclave, and steam curing it at high temperature and high pressure.

1 Drilling tool 11 Rotating shaft 111 Rotating shaft top 12 Cutting blade 10 Drilling device 2 Power source motor 21 Drive shaft 3 Power transmission unit 31, 32 Drive roller 33 Drive belt 4 Board unit 41 Mounting substrate 42, 43 Rotating shaft holding unit 44 Legs 20 Embedded hardware 201 Embedded hardware body 202 Magnetic generator 30 Lightweight aerated concrete panel (ALC panel)
301 Rebar

Claims (6)

A drilling device for lightweight cellular concrete panels that performs drilling to expose the openings of embedded hardware embedded in lightweight cellular concrete panels to the panel surface .
A drilling tool with a cutting blade at the tip of the rotating shaft,
A power source motor that produces a driving force that rotates the rotating shaft,
A power transmission unit that transmits the driving force to the drilling tool,
Equipped with
The power transmission unit includes a belt drive type power transmission mechanism that rotates the rotation shaft by a drive belt.
When the torque load received from the rotating shaft exceeds a predetermined value, the driving belt is one of the driving forces due to idling due to slipping at the interface where the driving belt and the rotating shaft are in contact with each other. Suspended so that the transmission of part or all is cut off,
Drilling device. The drive belt is made of a stretchable rubber material.
The drilling device according to claim 1. A clutch or a torque limiter is further provided as a power transmission cutoff mechanism that automatically cuts off the transmission of a part or all of the driving force when the torque load becomes a predetermined value or more.
The drilling device according to claim 1 or 2 . The rotating shaft is held by a rotating shaft holding portion that fixes the horizontal position of the rotating shaft.
The rotary shaft holding portion is configured so as not to give a resistance load to the vertical vertical movement of the rotary shaft.
The drilling device according to any one of claims 1 to 3 . A position sensor for detecting the vertical upward displacement of the rotating shaft is provided.
The drilling device according to any one of claims 1 to 4 . Drilling into the surface of a lightweight cellular concrete panel using the drilling device according to any one of claims 1 to 5 .
How to drill lightweight aerated concrete panels.

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