JP2016215323A - Scraper for pipe material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scraper for a pipe material which can enhance workability of a scraping work for the pipe material.SOLUTION: A scraper for a pipe material comprises: a cylindrical holding part 2 which holds a pipe material RP inserted thereinto; a first blade 2A which is rotationally driven integrally to the holding part 2 in the state that first blade contacts an outer peripheral surface of the pipe material RP held by the holding part 2, thereby cutting the outer peripheral surface; and a second blade 2B which is rotationally driven integrally to the holding part 2 in the state that first blade contacts an end surface of the pipe material RP held by the holding part 2, thereby cutting the end surface. The holding part 2 has an observation window 21E for observing the end surface of the pipe material RP held by the holding part 2 from an exterior of the holding part 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe scraper.

The pipe scraper is an apparatus used for cutting the outer peripheral surface and the axial end face of pipes connected to each other.
Pipe materials that require scraping work are resin pipes such as polyethylene pipes, which have higher corrosion resistance than cast iron pipes, and are used to join this type of pipe material while removing the altered layer on the outer surface. This is a tube material that is subjected to surface finishing for closely attaching an electrofusion saddle.
Removal of the deteriorated layer existing on the outer peripheral surface of the pipe material is performed using an outer peripheral surface scraper that moves the cutting tool on the outer peripheral surface in the axial direction by moving a bite-shaped cutting tool that cuts the outer peripheral surface in the same manner as a lathe. It is known (for example, Patent Document 1).

  On the other hand, the pipe material is prepared by cutting to a predetermined length before the electrofusion. For cutting the pipe, manual scissors (referred to as PE scissors), which are considered to be more convenient than conventional wheel cutters, can be operated by the same operation as normal scissors.

  In addition to the outer peripheral surface scraping operation for the outer peripheral surface, the pipe material used for electrofusion may be subjected to an end surface scraping operation for finishing an axial end surface cut with manual scissors into a surface perpendicular to the axial direction. It is known to use an end face scraper that cuts the end face perpendicular to the axis of the pipe material during the end face scraping operation (for example, Patent Document 2).

The outer peripheral surface scraping operation and the end surface scraping operation are often performed as necessary, and are performed as separate operations.
Therefore, when it is necessary to prepare separate scrapers according to the work content, the number of tools increases, and labor is required for transportation. There is a problem that work time required for replacement is increased, and workability is poor due to time-consuming work. In addition, when performing end face scraping work, the amount of cutting may increase carelessly if there is no way to check whether the end face has been finished in a state orthogonal to the axial direction when cutting the end face in the axial direction. There is a problem that workability is poor in that the work time becomes long.

JP 2007-268628 A JP 2014-87864 A

  An object of the present invention is to provide a pipe scraper that improves the workability of a pipe scraping operation.

  In order to achieve this object, the present invention provides a cylindrical holding part for holding a tubular material inserted therein, and an integral part of the holding part in contact with the outer peripheral surface of the tubular material held by the holding part. A first blade that cuts the outer peripheral surface by being driven to rotate, and the end surface is cut by being driven to rotate integrally with the holding portion while being in contact with the end surface of the tube material held by the holding portion. And the holding portion is in a tube scraper having an observation window for observing the end face of the tube held by the holding portion from the outside of the holding portion.

  According to the present invention, it is possible to continuously cut different surfaces by the first and second blades provided in the holding portion and to check the cutting state of the end surface by external observation. It is not necessary to replace the surface and the amount of cutting of the end face can be optimized, so that the workability during the scraping operation can be improved.

It is an appearance perspective view showing the whole composition of the scraper for pipes concerning the form for carrying out the present invention. It is the perspective view shown from the direction shown with a code | symbol (2) in FIG. It is a fragmentary sectional view which shows the structure of the 1st holding | maintenance part which supports the 1st blade used for the scraper for pipe materials shown in FIG. It is the fragmentary sectional view shown from the direction shown with a code (4) in FIG. It is a perspective view for demonstrating the structure of the 1st blade with which the 1st holding | maintenance part shown in FIG. 3 was equipped. It is a block diagram for demonstrating the control mechanism used for the scraper for pipe materials shown in FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, a tube scraper 1 according to an embodiment of the present invention includes a holding unit 2 that holds a resin tube (indicated by reference numeral RP in FIG. 2) such as a polyethylene tube, and a tube material. A first blade 2A (see FIG. 3) and a second blade 2B for cutting the outer peripheral surface and the end surface of the RP, respectively, are provided.

  The holding portion 2 is formed in a cylindrical shape to hold the resin pipe RP inserted therein, and a first blade for supporting the first blade 2A and the second blade 2B having different cutting target portions, respectively. The holding part 20 and the second holding part 21 are provided along the axial direction X. Since the pipe material RP is attached to the holding part 2 so that the axial direction which is the longitudinal direction is parallel to the axial direction X of the holding part 2, the axial direction of the pipe material RP may be referred to as the axial direction X in the following description. is there.

The first holding unit 20 and the second holding unit 21 are not only provided separately in the axial direction X of the holding unit 2 but also in the axial direction X in which the holding units 20 and 21 face each other. It is good also as providing the connection part 22 (refer FIG. 1, FIG. 2) in the edge part of this, and mutually separable through the screw part formed in the inside.
For example, when it is assumed that only the outer peripheral surface of the pipe material RP is cut at the beginning, the end portion cutting finish of the pipe material RP needs to be continuously performed. This is a convenient configuration for enabling both operations to be performed continuously by simply connecting the second holding portion 21.

Since the 1st holding | maintenance part 20 and the 2nd holding | maintenance part 21 differ in the cutting object location with respect to the pipe material RP, the structure also differs.
As shown in FIG. 3, the first holding unit 20 includes a guide roller 3, a feed roller 4, and a first roller arranged at equal positions in the circumferential direction with respect to the center P of the cross section orthogonal to the axial direction X. And a blade 23 having one blade 2A. A straight line passing through the center P of the cross section and parallel to the axial direction X is the rotation center of the first holding unit 20 and the rotation center of the second holding unit 21, and the rotation center of the holding unit 2. It has become. The center P of the first holding unit 20 is the same as the center of the second holding unit 21.

The guide roller 3 and the feed roller 4 are arranged at positions corresponding to the third and fourth quadrants partitioned by the coordinate axes intersecting at the center P on the paper surface of FIG. The blade 23 is pressed against the pipe material RP, and is arranged to face the upper peripheral surface of the pipe material RP. The positions of the guide roller 3, the feed roller 4, and the blade 23 with respect to the pipe material RP change as the holding unit 2 rotates as will be described later.
As shown in FIG. 4A, the guide roller 3 is a roller that is rotatable with a rotation shaft that is parallel to the axial direction X. As shown in FIG. 4B, the feed roller 4 is formed with a screw having an axial direction inclined by an angle θ as shown in FIG.
The guide roller 3 and the feed roller 4 are positioned so as to be pressed against the lower peripheral surface side of the tube material RP, and the tube material RP is pressed against the blade 23 by pressing. Note that FIG. 4 shows a case where the connecting portion 22 shown in FIGS. 1 and 2 is not provided, and the entire holding portion 2 is integrally formed. For this reason, a portion corresponding to the connecting portion is shown. The reference numeral 22 'signifies that the configuration differs from that shown in FIGS.

The guide roller 3 and the feed roller 4 are members that roll according to the rotation of the first holding unit 20 by the frictional force generated between the first holding unit 20 and the pipe material RP when the first holding unit 20 rotates around the pipe material RP. is there.
The feed roller 4 moves the pipe material RP in the axial direction of the pipe material RP by using the feed amount in the axial direction of the pipe material RP obtained by the inclination in the axial direction in addition to the lead angle of the screw when rotating itself. It is a member that can be fed. In this case, the feed amount (γ) per rotation of the feed roller 4 is expressed as follows: γ = πD · sin θ using the inclination angle θ of the axis and the outer diameter D of the screw as shown in FIG. It is the quantity calculated | required by.

As shown in FIG. 3, the blade 23 is integrated with a free end of a leaf spring 24 supported in a cantilever shape on one of a pair of support brackets 2 </ b> C provided in the first holding unit 20. ing.
As shown in FIG. 5, a part of the blade 23 is provided with a first blade 2A formed in a canna shape. The first blade 2A is attached to the first holding portion 20 so as to contact the outer peripheral surface of the pipe material RP in a state where the blade edge is parallel to the axial direction X of the pipe material RP held by the holding portion 2. Has been.
The blade 23 is given a habit of being in contact with the pipe material RP by the urging of the leaf spring 24, so that the outer peripheral surface of the pipe material RP can be cut by the first blade 2A.

The blade 23 is separated from the insertion path of the pipe material RP when the pipe material RP is inserted and removed. The operation lever 25 shown in FIG. 3 is used for the operation of separating the blade 23 from the insertion portion of the pipe material RP.
The operation lever 25 is supported by a swing support shaft 25A composed of a cam supported by the holding portion 2, and includes an operation portion 25B and a locking portion 25C positioned with the swing support shaft 25A interposed therebetween.

The swing support shaft 25A is displaced to a position at which the blade 23 is brought into contact with the pipe material RP and a position at which it is released according to the operation portion 25B being swung in the directions indicated by the cutting side and the release side in FIG. The cam profile to be set is set.
Therefore, when the operation portion 25B is swung to the release side, the blade 23 is separated from the outer peripheral surface of the pipe material RP against the bias of the leaf spring 24, and accordingly, the cutting of the pipe material RP by the first blade 2A is performed. It becomes impossible. The locking portion 25C is used as a portion for positioning the operation portion 25B on the release side by hitting the other end of the support bracket 2C when the operation portion 25B is swung to the release side.
When the operation portion 25B is swung to the cutting side, the blade 23 comes into contact with the outer peripheral surface of the pipe material RP by the urging of the plate spring 24, and the pipe material RP can be cut by the first blade 2A.

  The outer peripheral surface scraping operation, which is the outer peripheral surface cutting of the pipe material RP, rotates the first blade 2 </ b> A in the circumferential direction of the pipe material RP by rotationally driving the first holding unit 20 that is a part of the holding unit 2. Although it becomes possible, an external drive source such as a motor is used to rotate the first holding unit 20. As shown in FIG. 2, the drive shaft M <b> 1 of the motor is mounted on a second holding unit 21 that forms another part of the holding unit 2, so that the rotation of the motor is used as the holding unit 2 and the second holding unit 21. Is transmitted to the first holding unit 20 integrated with the first holding unit 20. Therefore, the outer peripheral surface of the pipe material RP can be cut by rotating in the circumferential direction of the pipe material RP integrally with the holding portion 2 in a state where the first blade 2A of the first holding portion 20 is in contact with the outer peripheral surface of the pipe material RP. . In the present embodiment, an external drive source is used as a configuration for rotating the first and second blades 2A, 2B integrally with the holding unit 2, but the present invention is not limited to this, and the second holding unit 21 is preliminarily provided. It is also possible to use a configuration in which a motor serving as a drive source and a drive shaft M1 are mounted. It is also possible to use a configuration in which only the motor drive shaft M1 is mounted on the second holding unit 21 in advance, and a motor chuck is externally loaded on the drive shaft M1 and rotated.

When the operation part 25B of the operation lever 25 is swung to the cutting side shown in FIG. 3 and the first holding part 20 is driven to rotate, the guide roller 3 and the feed roller 4 roll around the tube material RP.
The guide roller 3 holds the pipe material RP by its own rotation, while the feed roller 4 performs the feeding operation of the entire holding unit 2 in the axial direction X using the lead angle of the screw and the inclination of the axis. The outer peripheral surface of the pipe material RP can be cut by the rotation and feed of the first blade 2A with respect to the pipe material RP. The configuration of the first holding unit 20 is described in the specification of Utility Model Registration No. 2532166 which is the prior application of the present applicant.

As shown in FIG. 1, the second holding unit 21 provided in the holding unit 2 together with the first holding unit 20 has an end surface on the side opposite to the side facing the first holding unit 20 in the axial direction X. The formed recess 21A in which the motor shaft M1 can be mounted, the finger-holding portion 21B provided at an equally divided position in the circumferential direction of the outer peripheral surface of the second holding portion 21, and the inside as shown in FIG. The formed locking surface 21C and a flat portion 21D provided at a position closer to the recess 21A than the finger-hanging portion 21B are provided.
The finger hook portion 21 </ b> B is configured by a convex portion formed along the axial direction X on the outer peripheral surface of the second holding portion 21. The finger-hanging part 21B is used as a rotation operation part when the second holding part 21 is connected to the first holding part 20 through the screw part of the connecting part 22 described above, for example.

  As shown in FIG. 4, the inside of the second holding portion 21 is a hollow portion for inserting the pipe material RP, similarly to the first holding portion 20, and a locking surface is provided at the end portion in the axial direction X. 21C is formed and the axial direction edge part of the pipe material RP can be abutted.

The flat portion 21D is formed closer to the concave portion 21A than the finger hanging portion 21B, that is, closer to the center P of the cross section perpendicular to the axial direction X, and is used as a location where the second blade 2B is attached.
The flat portion 21D is a surface for setting the cutting edge of the second blade 2B in a direction orthogonal to the cutting edge of the first blade 2A, and the cutting edge of the second blade 2B is held by the holding unit 2. It is positioned so as to face the locking surface 21 </ b> C so as to contact the end surface of the pipe material RP.
In addition to the flat portion 21D for attaching the second blade 2B, the second holding portion 21 performs chamfering work on the end surface of the pipe material RP cut by the second blade 2B, as shown in FIG. A flat portion 21D ′ for attaching the chamfering blade 2B1 for performing is provided. The flat portion 21D ′ has an angle for obliquely chamfering and chamfering the edge existing on the outer peripheral edge of the end surface of the pipe material RP cut by the second blade 2B, and when the chamfering operation is performed, the chamfering blade 2B1 is mounted.

  The end face scraping operation, which is end face cutting of the pipe material RP, rotates the second holding part 21 integrally with the holding part 2 in a state where the second blade 2B held by the holding part 2 is in contact with the end face of the pipe material RP. This is done by driving.

As shown in FIG. 1, a part of the holding part 2, specifically, the second holding part 21 is an observation window 21 </ b> E for observing the cutting state of the end face of the pipe material RP from the outside of the second holding part 21. Are provided at a plurality of locations along the circumferential direction.
Each of the plurality of observation windows 21E has a slit 21E1 having a longitudinal direction parallel to the axial direction X, as shown in FIG. The position of the end of the pipe material RP held by the second holding part 21 through the slit 21E1 and the cutting edge of the second blade 2B is observed from the outside.

  For example, as shown in FIG. 2, the observation window 21 </ b> E is in a state of cutting the end surface of the pipe material RP when performing an end surface scraping operation in which the end surface of the pipe material RP is inclined and cut into a state perpendicular to the axial direction. Is used to stop the rotational drive of the second blade 2B when the end surface of the pipe material RP becomes perpendicular to the axial direction X. Therefore, if the rotational driving control of the second blade 2B is performed while observing the cutting state from the observation window 21E, the cutting amount is not increased carelessly, and the workability is prevented or suppressed from being lowered.

  As a configuration for confirming that the inclined end surface is cut and becomes perpendicular to the axial direction X, the end surface of the tube material RP is the axis of the tube material RP held by the second holding portion 21 of the holding portion 2. As shown in FIGS. 1 and 2, the second holding unit 21 is provided with a line 21E2 as a mark for displaying a position to be occupied in the slit 21E1 of the observation window 21E in the direction X. The line 21E2 is drawn to a region excluding the observation window 21E on the outer peripheral surface of the second holding portion 21 so as to correspond to the position of the locking surface 21C where the cutting edge of the second blade 2B is located. When the second holding portion 21 rotates, the line 21E2 leaves an afterimage due to the rotation even if the observation window 21E is missing, so that the continuous state of the line 21E2 and the end surface of the pipe material RP is matched. Judgment can be easily made.

In order to confirm the cutting state of the end face of the pipe material RP, it is also possible to use a configuration that uses chips of the pipe material RP cut and discharged by the second blade 2B.
Specifically, as shown in FIGS. 1 and 2, the flat portion 21 </ b> D, which is the attachment position of the second blade 2 </ b> B, is located near the location where the blade edge of the second blade 2 </ b> B faces the pipe material RP, A discharge portion 21F configured with an opening through which chips of the pipe material RP are discharged is provided.

  With the discharge unit 21F, it is possible to determine the cutting finish of the end surface of the pipe material RP based on the size of the chips of the pipe material RP discharged from the cutting edge of the second blade 2B. Specifically, as shown in FIG. 2, when cutting the pipe material RP whose end face is inclined with respect to the axial direction X, the end face inclined with respect to the axial direction X is accompanied by the rotation of the second holding portion 21. Then, the chips of the pipe material RP are intermittently discharged, and the chips of the pipe material RP are continuously discharged along with the rotation of the second holding portion 21 when the end surface becomes perpendicular to the axial direction X. Switch. The discharge part 21F is provided at a position where the chips are discharged in a concentrated manner, so that the state change of the above-described pipe material RP is reliably observed.

  Confirmation of the cutting finish state for the end face of the pipe material RP is not limited to observation by visual observation of the end face of the pipe material RP or observation of the discharge state of chips of the pipe material RP. For example, it is possible to use a change in pressure acting on the second blade 2B. Specifically, as shown in FIG. 6, the tube scraper 1 has a second shape when the end surface inclined with respect to the axial direction X of the tube material RP is cut and when it is cut at right angles to the axial direction X. A detection sensor 101 that detects that the pressure conditions acting on the blade 2B are different, and a control unit 100 that determines whether or not cutting of the end face of the pipe material RP has been completed based on the detection result of the detection sensor 101 are provided. Also good.

The detection sensor 101 is a pressure sensor capable of detecting the pressure received from the pipe material RP acting on the second blade 2B. The detection sensor 101 is an element capable of pressure-electric conversion, such as a piezo element, and is disposed in contact with a surface opposite to the surface facing the pipe material RP in the second blade 2B. .
When the pressure sensor 101 is brought into contact with the surface opposite to the surface facing the tube material RP, the collision reaction force from the tube material RP acting during cutting, that is, the reaction force from the cutting surface acts on the second blade 2B. Is detected directly.

In the control unit 100, the detection sensor 101 is connected to the input side, and the alarm unit 102 is connected to the output side.
When cutting the inclined end surface of the pipe material RP, the number of end surfaces that collide with the second blade 2B is cut more than the end surface perpendicular to the axial direction X, as in the case of the discharge portion 21F. In many cases, the collision time becomes longer as the end surface approaches a right angle to the axial direction X due to the progress of cutting.
Therefore, when the number of collisions of the end face with the second blade 2B per unit time is equal to or greater than a predetermined number, the control unit 100 determines that the inclined end face is being cut, and the predetermined number of times or less. If the number of collisions cannot be obtained continuously, it is determined that the cutting has been finished at a right angle to the axial direction X.
As shown in FIG. 6A, the alarm unit 102 includes a display unit 102A that displays the completion of cutting when cutting is completed. The display unit 102A displays that the control unit 100 has determined that the cutting of the end face of the pipe material RP by the second blade 2B has been completed by, for example, lighting display of characters such as “cutting is completed”.
Therefore, the operator rotates the holding unit 2 by judging whether or not the cutting finish to be an end surface perpendicular to the axial direction X is completed based on the visual observation of the alarm unit 102 without looking into the observation window 21E. If the driving state of the motor used in the control part is managed and the motor is stopped when it is completed, unnecessary cutting is not necessary.

FIG. 6B shows a configuration in which the control unit 100 stops the driving unit M including a motor used to rotationally drive the holding unit 2 when the cutting is completed.
In the figure, the alarm unit 102 connected to the control unit 100 includes a drive control unit 102B that controls on / off of the drive unit M using radio for the drive unit M.
As in the case described above, the control unit 100 determines the end of cutting of the end face of the pipe material RP based on the number of collisions per unit time received by the second blade 2B detected by the detection sensor 101. When the control unit 100 determines that the cutting of the end face of the pipe material RP by the second blade 2B is completed, the control unit 100 outputs a drive signal to the drive control unit 102B of the alarm unit 102, and the drive control unit 102B A signal for turning off the power switch is output.
Since the driving unit M is automatically stopped when the cutting is completed, the operator does not need to observe that the cutting of the end face of the pipe material RP is completed, and not only the unnecessary cutting is required. Further, since it is not necessary to make a mistake in the stop operation of the drive unit M, it is not necessary to perform unnecessary cutting.

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to this specific embodiment, Unless it is specifically limited by the above-mentioned description, this invention described in the claim is described. Various modifications and changes are possible within the scope of the gist of the invention. For example, it is possible to target not only the number of collisions that act on the pressure sensor but also the difference in pressure that acts directly when determining the completion of cutting using the pressure sensor. The difference in pressure in this case is based on the fact that the continuous pressure received when the end face is perpendicular to the axial direction and the intermittent pressure received before this appear as a difference in rubbing resistance against the second blade. doing.
The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

DESCRIPTION OF SYMBOLS 1 Scraper for pipe materials 2 Holding | maintenance part 2A 1st blade 2B 2nd blade 20 1st holding | maintenance part 21 2nd holding | maintenance part 21D Flat surface to which the 2nd blade is attached 21E Observation window 21E1 Slit 21E2 Mark 21F Discharge part 100 Control Part 101 Detection sensor 102A Display part M Drive part RP Pipe material X Axial direction

Claims (9)

A cylindrical holding part for holding the pipe material inserted therein;
A first blade that cuts the outer peripheral surface by being rotationally driven integrally with the holding portion in a state of being in contact with the outer peripheral surface of the pipe material held by the holding portion;
A second blade that cuts the end face by being driven to rotate integrally with the holding part in a state of being in contact with the end face of the pipe material held by the holding part,
The said holding part is a scraper for pipe materials which has an observation window for observing the said end surface of the pipe material currently hold | maintained at this holding part from the exterior of this holding part.   The holding portion contacts the outer peripheral surface of the pipe material held by the holding portion in a state where the cutting edge of the first blade is parallel to the axial direction of the pipe material held by the holding portion. The pipe member in which the first blade is attached so as to be in contact, and the blade edge of the second blade is held by the holding portion in a state where the blade edge of the second blade is orthogonal to the blade edge of the first blade The pipe scraper according to claim 1, wherein the second blade is attached so as to abut against the end face of the pipe scraper.   The said holding | maintenance part has the 1st holding | maintenance part to which the said 1st blade is attached, and the 2nd holding part to which the said 2nd blade is attached so that it can isolate | separate mutually. The scraper for pipes according to 2.   The tube scraper according to any one of claims 1 to 3, wherein the observation window is a plurality of slits provided along a circumferential direction of the holding portion.   The said holding | maintenance part has a mark which displays the position which the said end surface of this pipe material should occupy in the axial direction of the pipe material currently hold | maintained at this holding | maintenance part, It is any one of Claim 1 thru | or 4 characterized by the above-mentioned. Tube material scraper.   6. The tube scraper according to claim 1, wherein the holding unit includes a discharge unit through which pipe chips from the second blade are discharged. 7. A detection sensor capable of detecting a pressure acting on the second blade;
7. A control unit for determining whether or not cutting of the end face by the second blade is completed based on a change in the pressure detected by the detection sensor. The scraper for pipe materials as described in any one.   The pipe scraper according to claim 7, further comprising a display unit configured to display that the control unit determines that the cutting of the end face by the second blade has been completed.   The holding unit can be mounted with a driving unit that rotationally drives the holding unit with respect to the pipe material held by the holding unit, and the control unit has completed cutting of the end surface by the second blade. The tube scraper according to claim 7 or 8, wherein when the determination is made, the drive of the drive unit is stopped.

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