JP2019072936A - Plunge cutter - Google Patents

Abstract

To provide a plunge cutter with reduced labor and labor cost without the need for waste liquid treatment and the like.SOLUTION: The plunge cutter includes a slide pole 12 extending vertically upward from a fixed base 13, a slide block slidably mounted on the slide pole 12 and movable along the slide pole by a pinion rack mechanism, a plunge pipe 16 attached to a slide block 14, a plunge cutter body 18 fixed to the plunge pipe 16, a blade 20 axially mounted on the plunge cutter body 18 and rotationally driven by a motor incorporated in the slide block 14, and a gas blowing mechanism 22 for blowing gas against the blade 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a plunge cutter used for cutting concrete structures such as reinforced concrete and cutting of stone materials, and more particularly to a plunge cutter suitable for efficiently cutting horizontal or vertical concrete structures and the like.

  Conventionally, various cutting machines (mason cutters) are used as an apparatus for cutting a concrete structure. For example, as shown in FIG. 1 (FIG. 1 (a) is a perspective view and FIG. 1 (b) is a plan view), a cutting machine 110 including a main body 112, a rotary blade 130 and a nozzle unit 140 is disclosed There is.

JP, 2009-248343, A

  In the cutting machine 110 shown in FIG. 1, the main body 112 includes a body portion 114, a handle 116, a rotating shaft 118, a cover 120, and a power supply connection portion 122. The motor is operated to rotate the rotary blade 130 to bring the rotary blade 130 into contact with the object to be processed. Also, upon contact with the object to be processed, the cock 146b of the nozzle unit is opened, whereby the injection ports 142a and 144a of the nozzles 142 and 144 from the external supply source via the cooling water supply pipe 46 to the rotary blade 130 Cooling water is sprayed toward the end.

  As described above, the reason for using a liquid (for example, water) at the time of contact with the object to be processed is to instantly separate the chips generated at the time of cutting from the object to be processed, thereby realizing efficient cutting. It is intended to do. Generally, a cutter using such a liquid is referred to as a "wet" cutter.

  However, the use of a liquid in a wet cutting machine inevitably generates waste liquid. For example, when water is used as the liquid when cutting concrete, the waste liquid exhibits alkalinity. . Therefore, the subsequent waste liquid treatment requires time and labor costs, and there is room for improvement in this regard.

  Furthermore, in recent years, environmental problems tend to be more and more apprehended when treating wastewater, etc., and it is desirable to face the wastewater treatment with a higher technology in the above-mentioned wastewater treatment, which further increases labor and the like. There is a tendency.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a plunge cutter in which labor and labor costs are reduced without the need for waste liquid treatment and the like.

  The present inventors diligently studied a plunge cutter which requires less labor and labor cost compared to the prior art on the premise that waste liquid treatment and the like are unnecessary. As a result, waste fluid treatment and the like can be omitted by setting the fluid used for instantaneously separating the cutting waste generated at the time of cutting from the object to be processed instead of the liquid, thereby reducing labor and labor costs. I got the knowledge. The present inventors completed the invention based on the above findings. The summary is as follows.

[1] A slide pole extending vertically upward from a fixed base,
A slide block slidably mounted on the slide pole and movable along the slide pole by a pinion rack mechanism;
A plunge pipe attached to the slide block,
The plunge cutter body fixed to the plunge pipe;
A blade axially mounted on the plunge cutter body and rotationally driven by a motor incorporated in the slide block;
A plunge cutter comprising: a gas blowing mechanism for blowing a gas onto the blade.

  [2] The plunge cutter according to the above [1], wherein the gas blowing mechanism has a first nozzle whose injection port is directed to a planned contact position of the blade with the object to be processed.

  [3] The gas blowing mechanism further includes a second nozzle whose injection port is directed to a position opposite to the planned contact position of the blade with the object to be processed with respect to the axis of the blade. , The plunge cutter as described in the above [2].

  [4] The plunge cutter according to [2] or [3], wherein at least one of the first nozzle and the second nozzle is movable in the radial direction of the blade.

  [5] The nozzle directed to the contact position with the object to be processed is directed in the tangential direction at the contact point with the object to be processed and in the same direction as the rotational direction of the blade. The plunge cutter according to any one of [3].

  In the plunge cutter according to the present invention, not the liquid but the gas can be used to instantaneously separate the chips generated at the time of cutting from the object to be processed. As a result, according to the plunge cutter according to the present invention, it is possible to reduce labor and labor costs without the need for waste liquid treatment and the like.

FIG. 1 is a conventional wet cutting machine, (a) is its perspective view, and (b) is its plan view. FIG. 2 is a perspective view showing an example of the plunge cutter according to the present embodiment. FIG. 3 is a partial cross-sectional side view showing an example of use of the plunge cutter shown in FIG. FIG. 4 is a side view, partly in cross section, showing a modification of the plunge cutter shown in FIGS.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. These embodiments do not limit the present invention. Further, constituent elements of the above embodiment include those that can be easily replaced by persons skilled in the art or those that are substantially the same. Furthermore, various forms included in the above embodiments can be arbitrarily combined within the scope of the person skilled in the art.

<Basic form>
First, the basic form of the present invention will be described.
FIG. 2 is a perspective view showing an example of the plunge cutter according to the present embodiment. The plunge cutter 10 shown in the figure includes a slide pole 12, a slide block 14, a plunge pipe 16, a plunge cutter main body 18, a blade 20, and a gas spraying mechanism 22.

  As shown in FIG. 2, the slide pole 12 extends vertically upward from a fixed base 13 fixed in contact with a workpiece such as concrete. The slide pole 12 shown in the figure is a prismatic type, and a rack 12a is formed on one side surface thereof.

  The slide block 14 is configured to slide the slide pole 12 in a state of surrounding the slide pole 12. Specifically, a pinion (not shown) is formed on the slide block 14, and when the pinion is rotated in a state where the pinion engages with the rack 12 a of the slide pole 12, the slide block 14 follows the slide pole 12. Go up and down. For example, the rotation of the pinion can be performed via a transmission mechanism (not shown) provided with a noncontact electromagnetic clutch. The slide block 14 incorporates a motor for rotationally driving a blade 20 described later.

  The plunge pipe 16 is attached to the slide block 14 so as to be parallel to the slide pole 12. The plunge pipe 16 shown in the figure is a cylindrical type, and movable members 17a and 17b moving up and down on the plunge pipe 16 are attached to the vertical direction central portion and the lower portion thereof.

  The plunge cutter main body 18 is attached to the plunge pipe 16 in a fixed state.

  The blade 20 is attached to the plunge cutter body 18 by shaft attachment, and is rotationally driven by a motor (not shown) built in the slide block 14.

  The gas blowing mechanism 22 is a mechanism for supplying a gas from the outside and blowing the gas to the outer peripheral portion of the blade 20. In the example shown in FIG. 2, the gas blowing mechanism 22 is comprised from two nozzles 22a and 22b, and has injection ports Ja and Jb which respectively inject gas finally. The injection ports Ja and Jb are respectively configured as outlets penetrating the movable members 17a and 17b. Further, the injection port Ja is configured to be directed to the vertically lowermost position of the blade 20, that is, to the planned contact position of the blade 20 with the object to be processed. Further, the injection port Jb is configured to be directed to the vertically uppermost position of the blade 20, that is, to a position opposite to the planned contact position of the blade 20 with the object to be processed with respect to the axis of the blade 20. ing. In the present embodiment, of the two nozzles, the nozzle 22a is an essential component, but the nozzle 22b is an optional component.

  The movable members 17a and 17b described above are configured to freely change the vertical distance between the members 17a and 17b in accordance with the diameter of the blade 20 used. The injection ports Ja and Jb can be made to face each other at the outer peripheral portion of 20.

  In FIG. 2, the blade 20 is drawn transparent to clarify the positions of the other members 16, 17b, 18, 22a, but since it is actually made of metal, the blades of the member 16 etc. The portion overlapping with 20 is invisible.

  The plunge cutter 10 of this embodiment provided with such a component is used as follows. FIG. 3 is a partial cross-sectional side view showing an example of use of the plunge cutter shown in FIG. First, a circular hole H for guiding the plunge cutter main body 18 is formed on the side surface of the object to be processed (for example, concrete structure) W using a core drill. Next, the horizontal position of the fixed base 13 is determined so that the plunge cutter main body 18 enters the circular hole H, and the fixed base 13 is fixed on the workpiece W. As a fixing method, for example, it can be fixed to the side surface of the object to be processed W using a clasp not shown.

  Next, the motor built in the slide block 14 is activated to rotationally drive the blade 20, and the pinion which is a component of the slide block 14 is rotated to hit the blade 20 against the side surface of the object W to be cut To start. Just before the start of cutting, at least the nozzle 22a of the two nozzles 22a and 22b is supplied with a gas (for example, air) from the outside, and the gas is jetted from at least the injection port Ja. Then, the rotation of the pinion is continued and the cutting is advanced until the slide block 14 reaches the lower end of the slide pole 12.

  At the time of cutting, swarf is generated at the contact portion C with the blade 20 and the object to be processed W, and it is important to efficiently separate the swarf from the contact portion C. In the present embodiment, when the gas is injected from the injection port Ja, the chips are separated from the contact portion C instantaneously after the generation thereof.

  Finally, when the slide block 14 reaches the lower end of the slide pole 12, the pinion is reversely rotated, and the slide block 14 is moved vertically upward this time to return to the original position. During this time, it is preferable to stop the rotation of the blade 20 for safety, but the rotation may be left as it is. During this time, it is preferable to stop the injection of the gas for cost reduction, but the injection may be left as it is.

  The plunge cutter 10 having the above-described configuration can be used as described above, that is, by using gas instead of liquid as fluid, instantaneously separating cutting debris generated at the time of cutting from the object to be processed it can. As a result, according to the plunge cutter according to the present embodiment, it is possible to reduce labor and labor cost without the need for waste liquid treatment and the like.

<Additional form>
Next, additional embodiments of the present invention will be described.
FIG. 4 is a partial cross-sectional side view showing a modified example of the plunge cutter shown in FIGS. 2 and 3, and FIG. 3 is a view showing the plunge cutter from a position rotated 90 °. Among the constituent elements in FIG. 4, the same constituent elements as those shown in FIG. 3 are denoted by the same reference numerals. Further, in FIG. 4, reference numeral 14 a indicates a handle for rotating the pinion of the slide block 14.

  In the example shown in FIG. 4, unlike the example shown in FIG. 3, the blade 20 adopts a shape having a plurality of recesses cp and five openings h. With such a shape, the surface area of the blade 20 can be intentionally reduced, and the wear heat generated at the time of cutting the object to be processed can be efficiently suppressed.

  Also, in the example shown in FIG. 4, unlike the example shown in FIG. 3, in the gas blowing mechanism 22, from the upstream side, one nozzle branches into the nozzle 22a and the nozzle 22b at a position directly above the movable member 17a. In the above, the nozzle 22 a 1 and the nozzle 22 a 2 are further branched immediately above the contact portion C between the object to be processed W and the blade 20. And each nozzle 22a1, 22a2, 22b located in the most downstream part has injection port Ja1, Ja2, and Jb, respectively.

  In the plunge cutter 30 having such a configuration, the gas blowing mechanism 22 has a plurality of nozzles (considered that the branched nozzles are composed of a plurality of nozzles), and the injection ports Ja1 and Ja2 of at least one nozzle 22a1 and 22a2 are blades 20. It is pointed to the planned contact position (contact position C, C in FIG. 4) with the object W to be processed. For this reason, it is possible to instantaneously separate the chips generated at the time of cutting the workpiece W from the workpiece W, and to suppress the frictional heat generated between the blade 20 and the chips to prevent the slip of the blade 20 and Thermal deformation can be prevented. Therefore, according to the plunge cutter 30 configured as shown in FIG. 4, the workpiece W can be cut more efficiently.

  As for the nozzle 22b (including the injection port Jb) of the plunge cutter 30 shown in FIG. It is a component for reducing the temperature of the blade 20 which became. In particular, since the blade 20 that has become high temperature may be damaged by deformation, the nozzle 22b can not only achieve more efficient cutting, but also suppress deformation of the blade 20 and thus the durability of the blade 20. Can be improved.

  Next, in the example shown in FIG. 4, it is preferable that the nozzles 22 a 1, 22 a 2 and 22 b be movable in the radial direction of the blade 20. As means for making the nozzles 22a1, 22a2, 22b movable in the radial direction of the blade 20, for example, the portions of the nozzles 22a1, 22a2, 22b in the vicinity of the injection ports Ja1, Ja2, Jb can be expanded and contracted in the vertical direction And materials that can be moved in the vertical direction. Moreover, although each nozzle 22a1, 22a2, 22b may be made to connect on the upstream side as mentioned above, it can also be independently extended to the vicinity of the external supply apparatus of gas, without making it connect.

  Thus, each nozzle 22a1, 22a2, 22b. By making the blade 20 movable in the radial direction, a plurality of blades with different diameters can be appropriately attached to and detached from the plunge cutter main body 18, and a wide plunging process can be realized.

  Furthermore, in the example shown in FIG. 4, the nozzles 22 a 1 and 22 a 2 directed to the contact positions C and C with the workpiece W are tangential directions at the contact points with the workpiece W and the rotational direction of the blade 20. It is preferable to be directed in the same direction.

  Directing the nozzles 22a1 and 22a2 directed to the contact positions C and C with the workpiece W in the tangential direction at the contact point with the workpiece W and in the same direction as the rotation direction of the blade 20 Can apply a force in the same direction as the moving direction at the initial stage of generation to the swarf, so that the swarf can be more efficiently separated from the blade 20 and, consequently, the workpiece W is cut more efficiently be able to.

  As described above, according to the present invention, by using gas instead of liquid as fluid, it is possible to instantaneously separate cutting wastes generated at the time of cutting from the object to be processed. As the labor cost can be reduced. The waste liquid treatment referred to here is to treat so-called waste alkali, and the cost of 200 yen to 400 yen per liter has conventionally been incurred. Also, conventionally, not only facility cost and labor cost for processing waste liquid increase, but also time and effort are considerably increased. However, according to the present invention, these problems are completely solved, and in this sense the present invention is very promising.

10, 30 Plunge Cutter 12 Slide Pole 13 Fixed Base 14 Slide Block 14a Handle 16 Plunge Pipe 17a, 17b Movable Member 18 Plunge Cutter Body 20 Blade 22 Gas Spraying Mechanism 22a, 22b Nozzle C Contact Part H Circular Hole Ja, Ja1, Ja2, Jb Injection port W Object to be processed

Claims (5)

A slide pole extending vertically upward from the fixed base;
A slide block slidably mounted on the slide pole and movable along the slide pole by a pinion rack mechanism;
A plunge pipe attached to the slide block,
A plunge cutter body fixed to the plunge pipe;
A blade axially mounted on the plunge cutter body and rotationally driven by a motor incorporated in the slide block;
A plunge cutter comprising: a gas blowing mechanism for blowing a gas onto the blade.   The plunge cutter according to claim 1, wherein the gas spraying mechanism has a first nozzle whose injection port is directed to a planned contact position of the blade with the object to be processed.   The gas blowing mechanism further includes a second nozzle whose injection port is directed to a position opposite to the planned contact position of the blade with the object to be processed with respect to the axis of the blade. The plunge cutter according to 2.   The plunge cutter according to claim 2 or 3, wherein at least one of the first nozzle and the second nozzle is movable in the radial direction of the blade.   The nozzle directed to the contact position with the object to be processed is directed tangential to the contact point with the object to be processed and in the same direction as the rotational direction of the blade. Plunge cutter according to one item.

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