JP4704943B2 - Scraper for plastic tube - Google Patents

Description

  The present invention relates to a synthetic resin pipe scraper for cutting an outer surface of a pipe end portion so as to be easily fused before fusing a synthetic resin pipe, particularly a resin pipe such as a polyethylene pipe or a polypropylene pipe, and a joint. About.

  In recent years, synthetic resin pipes such as polyethylene pipes that are resistant to corrosion and earthquake and excellent in workability are often used for pipes for water supply and drainage and gas. As a method of connecting this type of synthetic resin pipe, an electrofusion joint (EF joint) is used to melt and join the outer peripheral surface of the end of the resin pipe and the inner surface of the joint by heating and melting. Generally, contact bonding is performed.

  In the case of connecting and joining resin pipes with such an EF joint, a pre-process for removing dirt on the surface to be fused and a surface-modified layer is necessary to ensure the quality of the joint such as airtightness and strength. For this reason, the outer surface near the end of the resin pipe is thinly cut (scraped) in advance before the joining operation.

  As a tool for performing this scraping, for example, Patent Document 1 proposes a scraper having a configuration in which a scraper body is supported by the outer surface of a resin tube, and the cutting blade is rotated around the surface of the resin tube and scraped off. . In this scraper, the scraper body can be freely opened and closed, and a blade is mounted on one member side so that the blade edge faces the other. When the scraper body is rotated on the other member side, the angle of the support shaft with respect to the tube axis A worm gear that changes is attached, and automatic feeding is applied according to the inclination angle of this worm gear.

Further, Patent Document 2 discloses a scraper capable of chamfering that removes burrs on a pipe end surface simultaneously with a scrape. This scraper is also configured to support the scraper body on the outer peripheral surface of the resin tube, and to circulate while cutting the cutting blade into the tube surface to scrape the surface of the resin tube.
JP-A-6-179118 JP-A-11-351484

  Since the scraper as described above has a cutting blade inside the scraper main body, it is difficult to visually recognize the cutting surface and cutting state of the resin tube, and the length of the scraper is long enough to cut a predetermined length in the tube axis direction. There was a risk of shortage or excessive shaving, and cutting had to be performed with great care.

  If the cutting length of the resin pipe is insufficient, it will be necessary to remove the resin pipe, check the length of the shortage, set the resin pipe on the scraper body again, and then cut the shortage. . Also, if the resin pipe is cut too much beyond the cutting length, even the insertion mark on the surface of the resin pipe, which is a measure of the connection state with the joint, will be removed, and this insertion mark will be marked again. There is a problem that work is required and workability is lowered.

  Therefore, the present invention eliminates the problems of the conventional scraper, facilitates cutting the outer surface of the end portion of the resin tube without excess and deficiency, and can efficiently advance the connection workability between the resin tubes. A scraper is provided.

In order to achieve the above-described object, the present invention provides a cutting blade disposed so as to be in contact with the outer peripheral surface of a synthetic resin tube, and the cutting blade along the outer peripheral surface of the synthetic resin tube along the circumferential direction and the tube axis direction. and feeding means for running in, Bei and holding means for holding the synthetic resin tube cutting capable Ete, cut cutting machining to plastic pipe scraper der the outer peripheral surface of the connection portion of the synthetic resin pipe joint is connected The main body frame is provided with an arm extending in parallel with the pipe axis direction along the outer peripheral surface of the synthetic resin pipe, and the arm is provided with a stopper capable of contacting the cutting blade and the end face of the synthetic resin pipe. And a cutting blade retracting means for separating the cutting blade from the outer peripheral surface of the synthetic resin tube, and the stopper member is provided so as to be positionally adjustable in the tube axis direction of the synthetic resin tube. Arranged according to the cutting length in the tube axis direction When cutting for the cutting length is completed during the cutting process, the end surface of the connecting portion of the synthetic resin tube comes into contact with the stopper member, and the cutting blade retracting means separates the synthetic resin tube and the arm to separate the cutting member. is separated blade from the outer peripheral surface of the synthetic resin tube is configured to so that stop the cutting.

In the synthetic resin pipe scraper according to the above configuration , the cutting blade retracting means includes a pressing portion connected to the stopper member, and the pressing portion presses the outer peripheral surface of the synthetic resin tube in the radial direction, thereby The cutting blade of the arm may be configured to be separated from the outer peripheral surface of the synthetic resin tube .

In the synthetic resin pipe scraper according to the above configuration , the arm is provided with an urging means and is urged in a direction away from the synthetic resin pipe, and the arm is attached to the body frame of the synthetic resin pipe. A fixing pin that is fixed in parallel with the tube axis direction and a locking portion of the fixing pin are provided, and the cutting blade retracting means includes a fixing releasing portion that is connected to the stopper member, and the fixing releasing portion is connected to the locking portion. The locking pin that is locked may be moved so as to be removed from the locking portion, and the arm may be separated from the synthetic resin tube and the cutting blade may be separated from the outer peripheral surface of the synthetic resin tube .

In order to achieve the above-described object, the present invention provides a cutting blade disposed so as to abut on the outer peripheral surface of the synthetic resin tube, and the cutting blade in the circumferential direction along the outer peripheral surface of the synthetic resin tube. A scraper for a synthetic resin pipe, which includes a feeding means for traveling in the tube axis direction and a holding means for holding the synthetic resin pipe so as to be cut, and which cuts the outer peripheral surface of the connecting portion of the synthetic resin pipe to which the joint is connected. The body frame is provided with an arm extending in parallel with the tube axis direction along the outer peripheral surface of the synthetic resin tube, and the arm can be in contact with the cutting blade and the end surface of the connecting portion of the synthetic resin tube. A stopper member and a cutting blade retracting means for separating the cutting blade from the outer peripheral surface of the synthetic resin tube are provided, and the stopper member is provided so as to be position-adjustable in the tube axis direction of the synthetic resin tube. According to the cutting length in the tube axis direction When cutting for the cutting length is completed during cutting, the end surface of the connecting portion of the synthetic resin tube comes into contact with the stopper member, and the cutting blade retracting means stores the cutting blade in the arm. plastic tube is separated from the outer peripheral surface of, but it may also be configured to stop the cutting Te.

In the scraper for a synthetic resin pipe according to the above configuration, the cutting blade retracting means includes a slider, one of which is connected to the stopper member and the other of which is connected to the cutting blade. The slider may be slid in the tube axis direction by the contact, and the cutting blade may be drawn into the arm and housed in conjunction with the slide .

According to the scraper for a synthetic resin pipe according to the above configuration, the outer peripheral surface of the connecting portion of the synthetic resin pipe can be easily cut by a predetermined cutting length, and the synthetic resin pipes can be connected to each other using a joint. The connecting work can be efficiently performed .

  According to the synthetic resin tube scraper of the present invention configured as described above, the outer surface of the end portion of the resin tube can be easily cut without excess or deficiency with respect to a predetermined cutting length. It is possible to efficiently proceed the fusion splicing work between the resin pipes, and to improve workability.

  Hereinafter, the best mode for carrying out the synthetic resin pipe scraper according to the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing an example of a scraper for a synthetic resin pipe according to the present invention, partly broken.

  The scraper 1 for synthetic resin pipes cuts the outer peripheral surface of the connection part 31 of the resin pipes 3 connected using a joint.

  As schematically shown in FIG. 1, the main body frame 2 includes a holding means 21 that holds the synthetic resin tube 3 so as to be cut and a cutting blade that is disposed so as to contact the outer peripheral surface of the resin tube 3 in the holding state. 22 and a feeding means 23 for causing the cutting blade 22 to travel along the outer peripheral surface of the resin tube 3 in the circumferential direction and the tube axis direction.

  The holding means 21 includes a core portion 211 that can be expanded in accordance with the inner diameter of the resin tube 3, and the contact plate 212 provided outside the core portion 211 is an inner peripheral surface of the connecting portion 31 of the resin tube 3. And is configured to hold the resin tube 3.

  Further, the main body frame 2 is provided with a rotating shaft 231 extending coaxially with the core portion 211. The feeding means 23 is configured to automatically advance the cutting blade 22 when the rotating shaft 231 rotates. In the illustrated embodiment, a rotary operation jig such as an electric drill is connected to a connecting shaft portion 232 that is provided outside the main body frame 2 and is formed on an extension shaft of the rotating shaft 231, thereby arbitrarily connecting the rotating shaft 231. It is comprised so that it can be rotated.

  An arm 24 extends from the main body frame 2 so as to be parallel to the tube axis direction along the outer peripheral surface of the resin tube 3 in a held state. The cutting blade 22 is provided at the tip of the arm 24, and a thin cutting tool is used.

  Furthermore, a stopper member 25 that can come into contact with the end face of the connecting portion 31 of the resin tube 3 is positioned on the arm 24 of the main body frame 2 by a slit 241 provided along the tube axis direction of the resin tube 3 in the holding state. It is arranged to be possible. Further, the stopper member 25 is provided to hang from the arm 24 so as to be able to contact the end surface of the connecting portion 31 of the resin tube 3 during the cutting process.

  Further, the arm 24 of the main body frame 2 is provided with a cutting blade retracting means 26 that acts to retract the cutting blade 22 that is in contact with the outer peripheral surface of the resin tube 3 with respect to the outer peripheral surface of the resin tube 3. . The cutting blade retracting means 26 moves the cutting blade 22 in contact with the outer peripheral surface of the resin tube 3 in conjunction with the contact between the end surface of the connecting portion 31 of the resin tube 3 and the stopper member 25 during the cutting process. 3 is provided so as to be retracted with respect to the outer peripheral surface.

  Therefore, by disposing the stopper member 25 in accordance with the cutting length of the resin tube 3 in the tube axis direction, when the cutting of the resin tube 3 is completed by the set cutting length, the cutting blade 22 is self-resined. The cutting is stopped after being separated from the outer peripheral surface of the tube 3.

  Such a synthetic resin pipe scraper 1 is used at a work site for fusion splicing of resin pipes, and is preferably lightweight and robust. For this reason, as a material of the main member which comprises the main body frame 2, it is desirable to use lightweight metals, such as aluminum and duralumin. Further, the cutting blade 22 may be a bit as illustrated, or may be a spiral rotary blade, and any steel blade that can cut the outer surface of the synthetic resin pipe thinly. May be.

  In using the synthetic resin pipe scraper 1, first, an insertion mark is marked on the outer peripheral surface of the connecting portion 31 of the resin pipe 3 to be joined by a joint. If there are scratches, dents, etc. on the surface of the resin tube 3, the portion is removed and dirt on the surface is removed.

  Next, the connecting portion 31 of the resin tube 3 is set on the holding means 21 of the main body frame 2 so that the arm 24 and the tube axis direction are parallel. A core portion 211 is inserted inside the resin tube 3 and attached with an expanded diameter. Further, the position of the stopper member 25 is adjusted in the tube axis direction so that the length before the insertion mark of the resin tube 3 is the cutting length.

  Finally, a rotary operation jig such as an electric drill is connected to the connecting shaft portion 232, and cutting is started. Thereby, it is easy to cut the outer peripheral surface of the connecting portion 31 of the resin tube 3 by a predetermined cutting length, and the subsequent connecting operation of the resin tube 3 can be efficiently performed. ing.

  Next, Example 1 of the scraper for synthetic resin pipes according to the present invention will be described with reference to the drawings.

  In addition, the synthetic resin pipe scrapers 1 of the first to third embodiments described below are characterized by the cutting blade retracting means 26 of the main body frame 2, and the cutting blade 22 is retracted by the cutting blade retracting means 26. Therefore, the characteristic configuration will be described in detail, and the description of the other basic configuration will be avoided by using the same reference numerals as those in the above description.

  2 and 3 are explanatory views schematically showing Example 1 of the scraper 1 for synthetic resin pipes of the present invention.

  The arm 24 of the main body frame 2 of the synthetic resin pipe scraper 1 according to this embodiment is extended along the outer peripheral surface of the resin pipe 3 in parallel with the pipe axis direction. Means 26 are provided.

  In this embodiment, the cutting blade retracting means 26 is configured so that the cutting blade 22 is separated from the outer peripheral surface of the resin tube 3 by stopping the cutting by separating the arm 24 from the outer peripheral surface of the resin tube 3. Yes.

  The cutting blade retracting means 26 includes a pressing portion 261 connected to the stopper member 25. As shown in the drawing, a lever 262 disposed along the tube axis direction of the resin tube 3 is connected to the base end portion side of the stopper member 25 depending on the arm 24, and the other end of the lever 262 is connected. The pressing part 261 is provided in the part.

  As shown in FIG. 3, when the end surface of the connecting portion 31 of the resin tube 3 and the stopper member 25 come into contact with each other, the free end side of the stopper member 25 is pushed toward the base portion of the arm 24 and the lever 262 tilts. Thus, the pressing portion 261 presses the outer peripheral surface of the resin tube 3 in the radial direction, and the arm 24 and the resin tube 3 are separated from each other, and the cutting blade 22 is separated from the outer peripheral surface of the resin tube 3. Eggplant.

  For this reason, just by arranging the stopper member 25 according to the cutting length of the resin tube 3 in the tube axis direction, the cutting of the resin tube 3 is completed by the set cutting length, and at the same time, the cutting blade 22 is replaced with the resin tube. The cutting process can be stopped at a distance from the outer peripheral surface 3.

  Next, Example 2 of the scraper for synthetic resin pipes according to the present invention will be described with reference to the drawings. 4 and 5 are explanatory views schematically showing Example 2 of the synthetic resin pipe scraper of the present invention.

  The arm 24 of the synthetic resin pipe scraper 1 extends in parallel with the pipe axis direction along the outer peripheral surface of the resin pipe 3, and the arm 24 is provided with a cutting blade 22 and a cutting blade retracting means 26. Further, the cutting blade retracting means 26 is configured such that the cutting blade 22 is separated from the outer peripheral surface of the resin tube 3 by stopping the arm 24 by separating the arm 24 from the outer peripheral surface of the resin tube 3, and the cutting is performed. The point is the same as in the first embodiment.

In this embodiment, the arm 24 is with respect to the main frame 2, in a state where the pin 242 is engaged with the engagement portion 243, which extends in parallel with the tube axis direction along the outer peripheral surface of the tube 3 ing. That is, the arm 24 is provided with appropriate urging means, and is urged in a direction away from the resin tube 3 by the urging means. The pin 242 is locked to the locking portion 243 to fix the arm 24, so that the arm 24 and the main body frame 2 are kept orthogonal to each other.

The respect to the arm 24 that is configured, the cutting blade retraction means 26 comprises a fixed releasing portion 263 which is connected to the stopper member 25. As shown, the stopper member 25, the lever 264 to extend proximally of A over arm 24 (rightward in the drawing) is connected, the other end of the lever 264 is in proximity to the pin 242 It is arranged, and has a fixed releasing portion 263.

As a result, as shown in FIG. 5, when the end surface of the connecting portion 31 of the resin tube 3 and the stopper member 25 come into contact with each other, the free end side of the stopper member 25 is pushed toward the base portion of the arm 24, and in conjunction with this, the lever 264 moves toward the base of the arm 24. Subsequently, fixed releasing portion 263 of the lever 264 end rotates by pressing the pins 242, remove the pin 242 from the locking unit 243. As a result, the arm 24 is released. As a result, the biased arm 24 is separated from the resin tube 3, and the cutting blade 22 is separated from the outer peripheral surface of the resin tube 3.

  Therefore, by simply disposing the stopper member 25 according to the cutting length of the resin tube 3 in the tube axis direction, the cutting of the resin tube 3 is completed by the set cutting length, and at the same time, the cutting blade 22 is moved to the resin tube 3. It is the structure which can be spaced apart from the outer peripheral surface of this, and can stop cutting.

  Next, Example 3 of the scraper for synthetic resin pipes according to the present invention will be described with reference to the drawings. 6 and 7 are explanatory views schematically showing Example 3 of the scraper for a synthetic resin pipe of the present invention.

  The synthetic resin pipe scraper 1 also has an arm 24 extending on the main body frame 2 along the outer peripheral surface of the resin pipe 3 in parallel with the pipe axis direction. A cutting blade 22 and a cutting blade retracting means are provided on the arm 24. 26 is provided.

  In the present embodiment, the cutting blade retracting means 26 stores the cutting blade 22 in a state protruding from the tip of the arm 24 in the arm 24 so that the cutting blade 22 is separated from the outer peripheral surface of the resin tube 3. It is configured to stop cutting.

  The cutting blade retraction means 26 has a slider 265 arranged so that one end is connected to the stopper member 25 and the other end is connected to the cutting blade 22. The slider 265 is provided with an appropriate slide member 266 so that it can slide smoothly in conjunction with the stopper member 25. Further, the cutting blade 22 is biased in a direction away from the outer peripheral surface of the resin tube 3, and the other end of the slider 265 presses the cutting blade 22 in a direction close to the outer peripheral surface of the resin tube 3, thereby It protrudes from 24 and is configured to come into contact with the outer peripheral surface of the resin tube 3.

  As shown in FIG. 7, when the end surface of the connecting portion 31 of the resin tube 3 and the stopper member 25 come into contact with each other, the slider 265 is interlocked with the stopper member 25 being pushed in the base direction (tube axis direction) of the arm 24. Slide in the same direction. As a result, the cutting blade 22 is drawn into and stored in the arm 24 and is separated from the outer peripheral surface of the resin tube 3.

  Therefore, by simply disposing the stopper member 25 according to the cutting length of the resin tube 3 in the tube axis direction, the cutting of the resin tube 3 is completed by the set cutting length, and at the same time, the cutting blade 22 is moved to the resin tube 3. It is the structure which can be spaced apart from the outer peripheral surface of this, and can stop cutting.

  Thus, in the synthetic resin pipe scraper 1 shown in any of the embodiments, it is easy to cut the outer peripheral surface of the connecting portion 31 of the resin pipe 3 by a predetermined cutting length. The connecting operation of the resin pipe 3 can also proceed efficiently.

  INDUSTRIAL APPLICABILITY The present invention is suitably used for cutting the outer surface of a pipe end portion so as to be easily fused before a synthetic resin pipe, particularly a resin pipe such as a polyethylene pipe or a polypropylene pipe, and a joint are fused. be able to.

It is a side view which shows a partially broken example of the scraper for synthetic resin pipes concerning the present invention. It is explanatory drawing which showed typically Example 1 of the scraper for synthetic resin pipes of this invention. It is explanatory drawing which showed typically operation | movement of the cutting blade in Example 1. FIG. It is explanatory drawing which showed typically Example 2 of the scraper for synthetic resin pipes of this invention. It is explanatory drawing which showed typically operation | movement of the cutting blade in Example 2. FIG. It is explanatory drawing which showed typically Example 3 of the scraper for synthetic resin pipes of this invention. It is explanatory drawing which showed typically operation | movement of the cutting blade in Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scraper for synthetic resin pipes 2 Main body frame 21 Holding means 22 Cutting blade 23 Feeding means 231 Rotating shaft 232 Connection shaft part 24 Arm 25 Stopper member 26 Cutting blade retraction means 3 Resin pipe 31 Connection part

Claims (5)

A cutting blade disposed so as to be in contact with the outer peripheral surface of the synthetic resin tube, a feed means for causing the cutting blade to travel along the outer peripheral surface of the synthetic resin tube in the circumferential direction and the pipe axis direction, and cutting the synthetic resin tube capable Bei and holding means for holding Ete, a switching cutting machining to plastic pipe scraper the outer peripheral surface of the connection portion of the synthetic resin pipe joint is connected,
This body frame arm extending parallel to the axial direction of the tube along the outer circumferential surface of the synthetic resin tube is provided,
The arm is provided with the cutting blade, a stopper member that can come into contact with the end face of the connecting portion of the synthetic resin tube, and a cutting blade retracting means for separating the cutting blade from the outer peripheral surface of the synthetic resin tube ,
The stopper member is provided so that the position of the stopper member can be adjusted in the pipe axis direction of the synthetic resin pipe, and is arranged in accordance with the cutting length of the synthetic resin pipe in the pipe axis direction.
At the time of cutting, when cutting for the cutting length is completed, the end surface of the connecting portion of the synthetic resin tube comes into contact with the stopper member, and the cutting blade retracting means separates the synthetic resin tube and the arm to move the cutting blade. plastic tube is separated from the outer peripheral surface of the synthetic resin pipe scraper, wherein Rukoto to stop cutting. In the scraper for synthetic resin pipes according to claim 1,
The cutting blade retracting means includes a pressing portion connected to the stopper member, and the pressing portion presses the outer peripheral surface of the synthetic resin tube in the radial direction, thereby causing the cutting blade of the arm to be removed from the outer peripheral surface of the synthetic resin tube. A scraper for synthetic resin pipes characterized by being spaced apart . In the scraper for synthetic resin pipes according to claim 1,
The arm includes an urging means and is urged in a direction away from the synthetic resin pipe, and the main body frame includes a fixing pin and a fixing pin for fixing the arm in parallel with the pipe axis direction of the synthetic resin pipe. A locking part is provided,
The cutting blade retracting means includes a fixing release portion connected to the stopper member, and the fixing release portion moves so as to remove the fixing pin locked to the locking portion from the locking portion, and the arm A scraper for a synthetic resin pipe, wherein the cutting blade is spaced apart from the outer peripheral surface of the synthetic resin pipe. A cutting blade disposed so as to be in contact with the outer peripheral surface of the synthetic resin tube, a feed means for causing the cutting blade to travel along the outer peripheral surface of the synthetic resin tube in the circumferential direction and the pipe axis direction, and cutting the synthetic resin tube A synthetic resin pipe scraper for cutting the outer peripheral surface of the connecting portion of the synthetic resin pipe to which the joint is connected,
The main body frame is provided with an arm extending parallel to the tube axis direction along the outer peripheral surface of the synthetic resin tube,
The arm is provided with the cutting blade, a stopper member that can come into contact with the end face of the connecting portion of the synthetic resin tube, and a cutting blade retracting means for separating the cutting blade from the outer peripheral surface of the synthetic resin tube,
The stopper member is provided so that the position of the stopper member can be adjusted in the pipe axis direction of the synthetic resin pipe, and is arranged in accordance with the cutting length of the synthetic resin pipe in the pipe axis direction.
At the time of cutting, when cutting for the cutting length is completed, the end surface of the connecting portion of the synthetic resin tube comes into contact with the stopper member, and the cutting blade retracting means stores the cutting blade in the arm so that the synthetic resin tube A scraper for synthetic resin pipes, which is separated from the outer peripheral surface and stops cutting . In the scraper for synthetic resin pipes according to claim 4,
The cutting blade retreating means includes a slider having one connected to the stopper member and the other connected to the cutting blade, and the connecting portion end surface of the synthetic resin tube abuts on the stopper member, so that the slider moves in the tube axis direction. A synthetic resin pipe scraper, wherein the cutting blade is retracted into the arm and housed in association with the slide .

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