JP5127867B2 - Fixing rebar processing device and method of using the same - Google Patents

Description

  The present invention relates to a fixing rebar processing device and a method of using the same, and more specifically, a processing device for fixing the fixing member in a state in which the tip portion of the rebar is inserted into a fixing member having a through hole, and The present invention relates to a method of using a processing apparatus.

  Fixing reinforcing bars are reinforcing bars processed to prevent the reinforcing bars embedded in the concrete from being pulled out in the longitudinal direction when a concrete structure is constructed. This anchoring reinforcing bar used to maintain the strength in the pulling direction by bending the reinforcing bar itself, but recently, for example, it takes time to fold the reinforcing bar at the construction site. In the vicinity, a fixing member (sometimes called a fixing metal) is fixed.

  This type of prior art is roughly divided into two types of configurations. The first is a configuration in which a fixing portion is provided by processing the tip of the reinforcing bar (see Patent Document 1), and the second is fixing at the tip of the reinforcing bar. The configuration is such that the member is mounted (see claims 2 to 4).

  In the above-described configuration for processing the tip of a reinforcing bar, the tip of the reinforcing bar used for fixing is heated and compressed in the axial direction, whereby the reinforcing bar of the heated portion expands in the circumferential direction, and this protrudes around the reinforcing bar. Thus, the same effect as that of the fixing member is obtained. As a method for processing such a fixing reinforcing bar, two fixing reinforcing bars are simultaneously completed by attaching and compressing the tips of two reinforcing bars for fixing (Patent Document 1). ).

  On the other hand, a configuration in which a fixing member is attached to the tip of a reinforcing bar is a configuration in which a male screw part is welded to the tip of the reinforcing bar and a fixing plate (fixing member) is clamped by a nut that is screwed into the male screw part (Patent Document 2). ), And the like (Patent Document 3) that allow the nut itself to function as a fixing plate (fixing member).

JP 2000-265618 A Japanese Patent Application Laid-Open No. 2001-122012 JP 2001-159214 A JP 2006-194069 A

  However, since the technique disclosed in the above cited document 1 is to process the reinforcing bar itself to form the fixing member, the reinforcing bar main body and the fixing member are integrated, and both materials are made of the same material. However, in order to obtain sufficient resistance against the pulling force acting in the axial direction of the reinforcing bar, the tip of the reinforcing bar must be greatly expanded in the circumferential direction. A powerful compressive force was required for proper processing. For this purpose, a large hydraulic unit is required, and a vise for firmly holding the reinforcing bar is necessary.

  On the other hand, since the techniques disclosed in the cited documents 2 and 3 are to weld the male screw portion so as to extend to the tip of the reinforcing bar, the portion to which the fixing member is attached (the male screw portion) is different from the reinforcing bar main body. It became a material, and it was not without fear of strength due to the degree of welding.

  In view of this, there has been proposed a fixing reinforcing bar in which the fixing member is arranged in a hook shape near the reinforcing bar tip and the fixing member is integrally fixed to the reinforcing bar by expanding the vicinity of the reinforcing bar tip (Patent Document 4). According to this technique, the fixing member is firmly fixed by the bulging portion of the reinforcing bar, the fixing member is maintained in a fixed state by the connection state with the reinforcing bar, and a resistance force against the pulling out of the reinforcing bar in the axial direction is obtained by the fixing member. Therefore, it is expected to be a suitable fixing reinforcing bar.

  By the way, in order to manufacture the fixing reinforcing bar, it is necessary to expand the vicinity of the reinforcing bar in a state where the fixing member is attached to the reinforcing bar. It is necessary to perform compression processing near the tip of the reinforcing bar, and adjusting the heating and compression to a suitable state and securing the fixing member stably at a predetermined position stabilizes the quality. An apparatus for performing such processing has been desired.

  The present invention has been made in view of the above-mentioned points. The object of the present invention is to provide an apparatus that can suitably adjust heating and compression and stably secure the position of the fixing member. The use is to stabilize the quality of the reinforcing bars.

  Accordingly, the present invention relating to a fixing rebar processing device is a fixing rebar processing device in which a fixing member is disposed in a hook shape at or near the end of a rebar, and the fixing rebar is fixed at a predetermined position on a base. A fixing member holding means for holding the member, a compression means arranged separately on both sides around the fixing member holding means, and a heating means for heating a predetermined range of the tip portion of the reinforcing bar, wherein the compression means A first slider capable of placing the reinforcing bar with the tip of the reinforcing bar to be processed facing the fixing member holding means and being able to advance and retreat in the axial direction of the reinforcing bar, and from the front of the reinforcing bar toward the tip of the reinforcing bar. A second slider capable of moving forward and backward, a reinforcing bar holding portion provided on the first slider, and a compression head provided on the tip of the second slider. The heating means includes a high frequency power supply unit, High frequency power supply An apparatus for processing a reinforcing steel bar, comprising: a work coil that generates a magnetic field by a high-frequency current supplied from a robot; and a lifting and lowering unit that is installed above a base and lifts and lowers the work coil. To do.

  According to the above configuration, the fixing member is held at a predetermined position by the fixing member holding means provided on the base, and the first slider constituting the compressing means arranged separately on both sides around the fixing member. As the second slider advances and retracts toward the fixing member, the positional relationship between the fixing member and the expanded portion of the reinforcing bar is stabilized. In particular, the first slider is provided with a reinforcing bar holding part, and by moving back and forth while holding the reinforcing bar to be processed, the tip of the reinforcing bar can be inserted into the fixing member. It is also possible to project the thickness. The heating means can heat the rebar tip by a high-frequency magnetic field generated by the work coil, and the work coil moves up and down to move to the position of the rebar tip during heating, and can be separated from the rebar tip after heating. it can.

  In the invention, the reinforcing bar holding portion is configured such that a vise base fixed to the first slider and arranged separately on both sides of the position where the reinforcing bar should be held, and an opposite end of the vise base are fixed. A sliding restricting portion that is inclined so as to gradually expand toward the member holding means; a clamp portion that can slide along the sliding restricting portion; and a drive means that slides the clamp portion. Can be.

  According to the said structure, a clamp part slides along the sliding control part of the vise base part divided | segmented and arrange | positioned on both sides, respectively, and the space | interval of the clamp parts of both sides will become wide and narrow. Therefore, if the interval between the clamp portions is reduced, the reinforcing bar to be processed can be held, and if it is extended, the holding of the reinforcing bar can be released. Further, the inclination direction of the sliding restricting portion is configured such that the opposing end edge of the sliding restricting portion widens the fixing member holding means side and gradually approaches in a direction away from the fixing member holding means. For this reason, when the clamp part moves toward the fixing member holding unit, the clamping state is loosened, and when it moves away from the fixing member holding unit, the clamping state is advanced. Therefore, when the first slider moves forward (moves in the direction of the second slider) while holding the reinforcing bar by the clamp part (holding the reinforcing bar by the whole device) and compressing the tip of the reinforcing bar, the reaction force received by the clamping part is the first The slider moves backward and forward in the advancing / retreating direction, and the clamp part acts in a direction to reduce the interval along the sliding restriction part. That is, when the reinforcing bar is compressed, the state of holding the reinforcing bar is maintained.

  Furthermore, as a structure of the clamp part in the said invention, it has a surface which opposes on both sides of the position which should hold | maintain the said reinforcing bar, and this opposing surface shall be maintained in parallel.

  According to such a structure, a clamp part will clamp a reinforcing bar by an opposing surface, and can make the clamping state of a reinforcing bar strong. In addition, since the opposing surfaces are maintained in parallel, the change in the interval between the opposing surfaces due to the movement of the clamp portion is widened and narrowed in the same state of the entire opposing surfaces.

  In each of the above inventions, the first slider and the second slider are first and second sliders driven by individual servo motors, respectively, and further control the amount of movement of the first and second sliders. It can be set as the structure provided with the control apparatus.

  According to the above configuration, when the sliders arranged separately on both sides with the fixing member as the center are pressed against each other to compress the tip of the reinforcing bar, the compression amount can be individually adjusted. By such individual adjustment of the compression amount, the compression amount of the portion protruding from the fixing member can be made different from the compression amount in the other portion, and an expansion state corresponding to the compression amount can be obtained. It becomes possible.

  The present invention according to the method of using the processing apparatus is a method of using the fixing bar processing apparatus as described above, wherein the fixing member is held by the fixing member holding means, and the reinforcing bar is held by the reinforcing bar holding part of the first slider. The first slider is pushed, the rebar is inserted into the fixing member, the work coil is moved up and down and stopped at a predetermined position, and the rebar is further pushed, and the tip of the rebar is moved to the work coil. After inserting into the work coil, supplying a high-frequency current to the work coil to heat the tip of the rebar, retreating the rebar until the work is removed from the work coil, and then lifting the work coil to separate it from the rebar tip, The gist of the present invention is a method of using a fixing bar processing apparatus, wherein two sliders are driven and the tip of the reinforcing bar is compressed by a compression head.

  According to the method of use as described above, the length of the reinforcing bar tip protruding from the fixing member can be easily adjusted by moving the reinforcing bar with respect to the fixing member held at a predetermined position. The position of the work coil can be moved to allow the rebar tip to enter, and the rebar tip protruding from the fixing member can be further inserted into the work coil. In addition, after heating the reinforcing bar tip, the reinforcing bar can be removed from the work coil by retracting the reinforcing bar, and the relative positional relationship of the reinforcing bar tip with respect to the fixing reinforcing bar can be adjusted. Then, by raising and lowering the work coil, the second slider can be advanced and retracted, and the rebar tip can be pressed by the compression head arranged at the tip of the second slider.

  Further, the present invention according to the method of using the processing apparatus has a configuration in which the first slider and the second slider are driven by individual servo motors, and further includes a control device for controlling the movement amount of the first and second sliders. A method of using the processing apparatus, wherein the fixing member is held by the fixing member holding means, and the tip surface of the compression head is made to coincide with the tip position of the reinforcing bar installed on the basis of one surface of the fixing member, The reinforcing bar is held by the reinforcing bar holding part of the first slider, the first slider is driven to insert the reinforcing bar into the fixing member, and the tip of the reinforcing bar is stopped at a position where it abuts against the tip surface of the compression head. After inputting the stop position as a reference position to the control device, the compression head is moved backward, the work coil is moved up and down, and then the first slider is moved a predetermined distance. Protruding and inserting the tip of the rebar into the work coil, supplying high-frequency current to the work coil to heat the tip of the rebar, and retracting the rebar until it is removed from the work coil. The gist of the method is to use the fixing bar processing apparatus, wherein the bar is moved up and down to be separated from the reinforcing bar tip, the second slider is propelled by a predetermined distance, and the reinforcing bar tip is compressed by the compression head.

  According to the method of use as described above, in addition to the case of the invention according to the method of use described above, the movement amounts of the first slider and the second slider by the servo motor can be controlled. In particular, the first slider holds the reinforcing bar, and the reinforcing bar moves forward and backward as the slider moves forward and backward.The tip position of the reinforcing bar varies depending on when the reinforcing bar is installed, and also when the clamp is clamped. Set a reference point for the amount of movement of the first slider in the forward / backward direction, based on the position where the tip of the reinforcing bar comes into contact with the compression head that stops at a predetermined position. Can do. These set values and slider movement amounts are controlled by the control device. Note that the set value and the movement amount can be changed by changing the input value of the control device.

  According to the present invention relating to the fixing bar processing apparatus, the tip of the reinforcing bar can be heated by the high-frequency magnetic field generated by the work coil, and the tip can be compressed by the slider from both sides around the fixing member. Can be suitably adjusted. The fixing member is held by holding means provided on the base, and the fixing member can be fixed by adjusting the amount of advancement and retraction of the sliders on both sides thereof, so that the position of the fixing member can be secured stably. It will be possible. Further, the compression state can be stabilized by driving the slider by the servo motor and controlling the movement amount by the control device.

  Further, according to the present invention relating to the method of using the processing apparatus, the position of the reinforcing bar tip, the lifting / lowering position of the work coil, and the compression based on the position of the fixing bar held by the fixing member holding means provided on the base The position of the head can be appropriately moved and stopped along the processing procedure, and the quality stability by the processing apparatus can be realized. In particular, when the movement amount is controlled while the slider is driven by a servo motor, the movement of each part is controlled. Therefore, the fixing reinforcing bar processed by such a method of use has the position of the fixing member and the reinforcing bar. The expanded state is almost the same, and the quality can be stabilized.

It is a front view which shows the outline of embodiment of a processing apparatus. FIG. 6 is an explanatory diagram illustrating details of a fixing member holding unit. It is a top view which shows the detail of a 1st slider. It is explanatory drawing which shows the detail of a reinforcement holding | maintenance part. It is a front view which shows the detail of a 2nd slider. It is explanatory drawing which shows the detail of a heating means. It is explanatory drawing which shows the outline of the reinforcing steel for fixing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, an embodiment of the invention relating to a fixing rebar processing apparatus will be described. FIG. 1 is a schematic diagram showing the entirety of the present embodiment. As shown in this figure, the present embodiment includes a fixing member holding means 1 positioned substantially at the center of the apparatus A, compression means 2 and 3 arranged separately on both sides around the fixing member holding means, and an apparatus. It is the structure provided with the heating means 4 arrange | positioned above A. FIG.

  In the fixing member holding means 1, a holding portion 12 that can hold the fixing member in a fixed manner is detachably provided on an upper portion of the main body portion 11 fixed to the base B. Although details of the holding portion 12 will be described later, a different one can be attached to the main body portion 11 depending on the type of fixing member fixed to the reinforcing bar or the diameter or type of the reinforcing bar.

  The compression means 2 of one of the compression means 2 and 3 (hereinafter referred to as a reinforcing bar moving side) advances and retreats while holding the reinforcing bar, and the compression means 3 of the other side (hereinafter referred to as a tip pressing side) has a tip of the reinforcing bar. It advances and retreats like pressing.

  The compression means 2 on the reinforcing bar moving side includes a first slider 21 that slides on the base, and a reinforcing bar holding part 5 is further provided above the first slider 21. The compression means 3 on the tip pressing side includes a second slider 31 that slides from the inside of the base so that it can protrude and retract, and a compression head 32 is provided at the tip of the second slider 31. Both the slide of the first slider 21 and the slide of the second slider 31 are provided such that the rotation shaft rotated by the motors 23 and 33 is driven in the forward and backward direction by a ball screw. The rotating shafts are arranged parallel to each other in the axial direction, but the first slider 21 is provided at a position lower than the position where the reinforcing bar is installed, whereas the second slider 31 is made to coincide with the axis of the reinforcing bar. Yes.

  The heating means 4 includes a high-frequency current transformer 41 disposed above the base B and a work coil 42 connected to the high-frequency current transformer 41. The high-frequency current transformer 41 is installed on a frame body 43, and the frame body 43 is supported by the upper frame UF of the base B and is provided so as to be moved up and down by a hydraulic cylinder 44. The work coil 42 is formed in a substantially cylindrical shape and is connected to the high-frequency current transformer 41 via the arm 45 so that the cylindrical axis is maintained parallel to the axis of the reinforcing bar. The high frequency current supplied to the high frequency current transformer 41 is generated by a high frequency power supply unit (high frequency oscillator) HFU installed in the vicinity of the base.

  Next, details of each part will be described. FIG. 2 shows details of the fixing member holding means 1. As shown in this figure, the holding portion 12 has a gap corresponding to the thickness of the fixing member. In order to secure this gap, contact surface portions 13 and 14 that contact both surface sides of the fixing member are provided. The contact surface of one of the contact surface portions 13 and 14 (for example, the contact surface portion on the side away from the compression head 32) 13 can be used as a reference surface. In this case, the other contact surface portion 14 is used. The position of the contact surface can be changed according to the thickness of the fixing member. In addition, positioning members 15 and 16 for determining the positions of the left and right sides and the lower end of the fixing member are provided on one abutting surface portion 13 in order to make the position of the center hole of the fixing member coincide with the axis of the reinforcing bar.

  Since the holding part 12 having such a configuration can be attached to and detached from the main body part 11, the two abutting conditions are set on condition that the position of the contact surface of the one contact surface part 13 serving as the reference surface is constant. By exchanging the contact surface portions 13 and 14, the fixing member of each dimension can be held. That is, one abutting surface portion 13 has a reference surface for positioning the fixing member and the positioning members 15 and 16, and therefore, by exchanging the abutting surface portion 13, the center hole of the fixing member to be retained Since the other contact surface portion 14 affects the gap from the reference surface, the fixing member having a different thickness can be reliably held by exchanging it.

  As shown in FIG. 3, the first slider 21 is composed of a planar member having an appropriate area in the upper part of the base B. It is supported by rails L1 and L2 arranged separately in the width direction of the base B, and the movement direction is regulated. The motor 33 is provided so that it can be moved forward and backward by a drive unit 24 that can be driven forward and backward while being decelerated by the speed reducer 22. Therefore, the first slider 21 of the planar member is configured so as to advance and retreat along the rails L1 and L2 of the base B as a whole.

  Details of the structure of the reinforcing bar holding portion 5 provided in the first slider 21 are shown in FIG. As shown in this figure, a pair of vise bases 51 and 52 separated on both sides of a reinforcing bar to be held are fixedly provided on the first slider 21. Opposite ends 53 and 54 are formed in the vice bases 51 and 52 in an oblique shape, the end portions 53 and 54 are symmetrically inclined, and the gap between the opposing portions is a fixing member holding means. It gradually expands toward 1. The end portions 53 and 54 are formed of a plane having a predetermined area.

  A pair of clamp portions 61 and 62 are engaged with the vise base portions 51 and 52. Part of the clamp portions 61 and 62 are provided with slidable contact surfaces 63 and 64 which are in slidable contact with the planes of the end portions 53 and 54 of the vise base portions 51 and 52, and the slidable contact surfaces 63 of the clamp portions 61 and 62. , 64 slides on the planes of the end portions 53, 54 of the vise bases 51, 52, the sliding advances and retreats along the inclination of the end portions 53, 54. As a result, a pair of clamp portions The interval between 61 and 62 can be expanded or reduced. In addition, concave grooves 55 and 56 parallel to the inclination are formed in the vicinity of the end portions 53 and 54 of the vise base portions 51 and 52, and similarly long projections 65 and 66 are formed in the clamp portions 61 and 62. The protrusions 65 and 66 are provided and engaged with the concave grooves 55 and 56, so that the sliding is restricted.

  Furthermore, rebar abutting portions 67 and 68 that abut against the reinforcing bars are provided at the edges where the pair of clamp portions 61 and 62 are opposed to each other, and when the clamps 61 and 62 reduce the gap as described above, the reinforcing bars The reinforcing bars are clamped by the contact portions 67 and 68. Therefore, the reinforcing bar abutting portions 67 and 68 are parallel to the axis of the state where the reinforcing bars are to be held in a state where the pair of clamp portions 61 and 62 are engaged with the vise bases 51 and 52. Yes.

  Specifically, the reinforcing bar abutting portions 67 and 68 are formed in a long and substantially planar shape, and the longitudinal direction of the substantially planar portion coincides with the axis of the reinforcing bar to be held. That is, the reinforcing bar abutting portions 67 and 68 abut the reinforcing bars from both sides so that the reinforcing bars are sandwiched along the longitudinal direction of the substantially planar portion. More specifically, the reinforcing bar abutting portions 67 and 68 have a V-shaped cross section (short-direction cross section), and two bar-like reinforcing bars are formed on each surface like a V block. It can come into contact with the shaped part. Further, by sandwiching the reinforcing bars from both sides by the reinforcing bar abutting portions 67 and 68 having a V-shaped cross section, even if the types and diameters of the reinforcing bars to be held are different, the axis is at the same position. Further, the substantially planar portion can be configured to form fine irregularities on the surface, and the reinforcing bars can be securely sandwiched by having such irregularities.

  The reinforcing bar holding part 5 is provided with an advancing / retreating member 7 independent of the advancing / retreating of the first slider 21, and drives the sliding of the clamp parts 61, 62. A hydraulic cylinder can be used as the advance / retreat member 7. Then, the advancing / retreating member 7 is operated to move the clamp portions 61, 62 forward (moving toward the fixing member side), whereby the reinforcing bar contact portions 67, 68 of the clamp portions 61, 62 expand the gap, and the reinforcing bars It is possible to have a gap larger than the wall thickness. Conversely, the gap between the reinforcing bar abutting portions 67 and 68 can be reduced by retracting the clamp portions 61 and 62 (moving away from the fixing member). In the vicinity of the hydraulic cylinder 7 of the reinforcing bar holding part 5, a reinforcing bar receiving part 57 for supporting the weight of the reinforcing bar to be held is provided. The reinforcing bar receiving part 57 supports a part of the reinforcing bar on its axis when sandwiched between the clamp parts 61 and 62. While maintaining the center line of a reinforcing bar horizontal, it has the effect which prevents a reinforcing bar from contacting the hydraulic cylinder 57 grade | etc.,.

  Since it is such a structure, when hold | maintaining a reinforcing bar, the clamp parts 61 and 62 are advanced beforehand, a gap | interval is expanded to such an extent that a reinforcing bar can be arrange | positioned in the middle of the reinforcing bar contact parts 67 and 68, and a reinforcing bar. After the bar is placed, the clamps 61 and 62 are retracted so that the reinforcing bars can be clamped with the axis thereof directed in a predetermined direction. Further, according to the configuration of the reinforcing bar holding portion 5, when the reinforcing bar tip is compressed, that is, in a state where the reinforcing bar tip is protruded from the fixing member, the reaction force is generated when the compression head 32 is pressed against the reinforcing bar tip. Although acting on the reinforcing bar holding portion 5, this reaction force acts in a direction in which the clamp portions 61 and 62 are retracted. At this time, since the clamp portions 61 and 62 are sufficiently retracted to sandwich the reinforcing bars, when the clamp portions 61 and 62 are retracted, the reaction force acts so as to sandwich the reinforcing bars more firmly. It becomes. Therefore, the position of the reinforcing bars does not easily change due to the reaction force of the compression force during the compression process.

  As shown in FIG. 5, the second slider 31 has a configuration in which the rotational force of the motor 33 is decelerated by a speed reducer 34 and then converted into a linear movement by a ball screw. The ball screw is provided substantially at the center of the main body 30, and the second slider 31 is provided so as to be continuous with the surrounding peripheral portion. The main body 30 is formed in a substantially cylindrical shape, and the second slider 31 is formed in a columnar shape so that the second slider 31 can be projected and retracted from the opening at the tip 30 a of the main body 30.

  A substantially cylindrical compression head 32 is attached to the tip of the second slider, and the center line of the compression head 32 is an extension of the center line of the second slider. In addition, on the extension line of the center line of the second slider, the respective positions are located so that the center of the center hole in the state where the fixing member is held and the axis of the reinforcing bar held by the reinforcing bar holding part 5 exist. It has been adjusted. That is, as described above, the second slider 31 can only advance and retreat by the driving force of the motor 33, and only reciprocates along a certain center line, and does not move in the height direction or the width direction. It is. Accordingly, the positions (positions in the height direction and the width direction) where the fixing member and the reinforcing bars are held are adjusted based on the center line of the second slider 31.

  That is, when the diameters of the reinforcing bars are different, the clamp parts 61 and 62 of the reinforcing bar support part 5 have the reinforcing bar abutting parts 67 and 68 having a V-shaped cross section as described above, so that the axis of the reinforcing bar is constant. Therefore, adjustment of the height and the like is not necessary for the compression of the reinforcing bar tips by the compression means 2 and 3. If the diameter of the reinforcing bar is different, the type of fixing member to be attached to the reinforcing bar is different (at least the diameter of the central hole is different). Therefore, as described above, the contact surface portions 13 and 14 (in particular, the positioning member 15). , 16 is exchanged so that the center position of the central hole of the fixing member needs to match the axis of the reinforcing bar.

  As shown in FIG. 6, the work coil 42 of the heating means 4 is disposed outside the frame body 43 on which the high-frequency current transformer 41 is mounted and below the frame body 43. That is, the work coil 42 is configured integrally with the high-frequency AC device 41 with an arm (arm electrode) 45 interposed, and the arrangement state of the work coil 42 is determined by the length and angle of the arm 45. However, the position of the work coil 42 depends on the position of the high-frequency alternator 41, and the high-frequency alternator 41 depends on the position of the frame 43 on which the work coil 42 is mounted.

  Since the work coil 42 has a spiral (normal) coil shape, the work coil 42 is roughly cylindrical, and is heated by applying a high-frequency magnetic field to the metal material inserted therein. Therefore, the (cylindrical) axis of the work coil 42 is maintained parallel to the axis of the reinforcing bar. Then, by raising and lowering the work coil 42, its (cylindrical) axis can be moved on the extension of the axis of the reinforcing bar. Therefore, by moving the reinforcing bar in the axial direction, the tip of the reinforcing bar can be inserted into the (cylindrical) inside of the work coil 42.

  The work coil 42 is moved up and down by moving the frame 43 up and down. The frame body 43 is raised and lowered by the cylinder 44 provided in the upper frame UF as described above. The upper frame UF is provided with restricting portions 46 and 47 that partially penetrate the frame body 43, and by sliding along the restricting portions 46 and 47, the position when moving up and down is restricted. It is like that. By raising and lowering the work coil 42, the work coil 42 can be lowered to the height of the reinforcing bar only when the tip of the reinforcing bar is heated, and the tip compression process of the reinforcing bar is made possible by raising after the heating. That is, in order to compress the tip of the reinforcing bar, the compression head 32 of the second slider 31 is pressed from the tip side of the reinforcing bar, but the operation of the compression head 32 at that time is not hindered. It is.

  The lower and lower stoppers 48 and 49 are provided in the restricting portions 46 and 47 for restricting the raising / lowering position of the frame body 42 so that the position of the work coil 42 when lowered is constant. Further, the frame body 43 is disposed above the second slider 31. When the frame body 43 is lowered to a position where it does not come into contact with the second slider 31, the work coil 42 stops at the position of the axis of the reinforcing bar. Has been adjusted.

  According to the processing apparatus of the present embodiment, the reinforcing bars are clamped by the clamp parts 61 and 62 of the reinforcing bar holding part 5 and are maintained horizontally together with the reinforcing bar receiving part 57, and the fixing member holds the fixing member. The twelve positioning members 15 and 16 align the center hole with the axis. The first slider 21 can move forward and backward while holding the reinforcing bar, and the second slider 31 can move forward and backward while matching the center of the compression head 32 at the tip with the axis of the reinforcing bar. Further, when the work coil 42 is lowered, a rebar can be inserted, and when the work coil 42 is raised after heating, the work coil 42 can be separated from the second slider 31.

  Accordingly, the procedure when using the processing apparatus of the above embodiment is as follows. First, the fixing member and the reinforcing bar are held by the fixing member holding means 1 and the reinforcing bar holding part 5, respectively, and the first slider 21 is moved forward (moved toward the fixing member), whereby the reinforcing bar is moved into the center hole of the fixing member. To be inserted. Next, after lowering the work coil 42, the rebar is advanced further to place the tip of the rebar inside the work coil 42. Then, a high frequency current is supplied to the work coil 42 to heat the rebar tip.

  After sufficient heating by supplying current for an appropriate time, the reinforcing bar is once retracted and the reinforcing bar is pulled out from the work coil 42. Note that the backward movement at this time adjusts the backward distance so that the position of the tip of the reinforcing bar becomes a desired position with respect to the fixing member. After the tip of the reinforcing bar is detached from the work coil 42, the work coil 42 is raised. Subsequently, the second slider 31 is moved forward (moved toward the rebar tip) and brought into contact with the heated rebar tip. Subsequently, both the first slider 21 and the second slider 31 are advanced to compress the reinforcing bar tips from both sides at the same time, thereby forming expansion portions on both sides of the fixing member. Finally, the first slider 21 and the second slider 31 are moved backward to release the holding of the first slider 21 by the reinforcing bar holding portion 5.

  According to such a use procedure, the reinforcing bars are processed by the apparatus except that the reinforcing bars are placed on the apparatus and the reinforcing bars are taken out after the processing. The timing and amount of movement of the first slider 21 and the second slider 31 forward and backward (collectively referred to as advance and retract) and the work coil 42 descending and ascending (collectively referred to as elevation) can be performed by human action. These can be automated by being controlled by a numerical control system or the like.

  That is, the motors 23 and 33 that drive the first slider 21 and the second slider 31 in the forward / backward direction are servo motors, and Pulse Width Modulation (hereinafter referred to as PWM) control is performed according to a command from a control device (arithmetic unit). Then, the direction of current is changed to reverse the direction of rotation of the motor, and the amount of movement of the sliders 2 and 3 is adjusted by adjusting the number of rotations of the motor. The position of the tip of both sliders 2 and 3 (that is, the tip of the reinforcing bar held by the first slider 21 and the tip of the compression head 32 by the second slider 31) is quantified by the number of rotations of the motor. Therefore, the control device calculates the amount of compression and adjusts the rotation speed of the servo motors 23 and 33.

  Since the tip of the first slider 21 (the tip of the reinforcing bar) differs depending on the state of the reinforcing bar to be held, the tip position of the reinforcing bar is sensed and determined. For this sensing, in addition to using a means for detecting by an optical sensor, with the tip of the compression head 32 previously stopped at a predetermined position, the tip of the reinforcing bar is brought into contact with the position of the tip of the reinforcing bar at that time. A means based on can be used. The control device also controls the drive timing of the drive device of each part, and controls the procedure from the initial stage to the completion of machining.

  In the case of such an apparatus, the usage method is as follows. That is, the fixing member is held by the fixing member holding means, and the processing is started from the state where the reinforcing bars to be processed are mounted on the first slider 21. First, the control device moves the compression head 32 at the end of compression. The position of the compression head 32 is set to a predetermined position from the contact surface portion 13 that holds the fixing member. Next, the cylinder 7 of the reinforcing bar holding part 5 is driven, and clamping of the reinforcing bars by the clamp parts 61 and 62 is started. When the reinforcing bar is pinched, the servo motor 23 of the second slider 2 is started and the slider 2 is advanced. As the slider 2 advances, the reinforcing bar moves toward the fixing member, and further, the leading end portion protrudes toward the second slider 31 through the center hole of the fixing member. A compression head 32 is present in front of the reinforcing bar, and the movement of the first slider 21 is stopped in a state where the tip of the reinforcing bar is in contact with the compression head 32. In this state, the position of the reinforcing bar (the initial value of the first slider 21) is determined, and the amount of movement of the reinforcing bar in the advancing / retreating direction is controlled based on this position.

  Next, the second slider 31 is moved backward to separate the compression head 32 from the tip of the reinforcing bar, thereby providing a space near the tip of the reinforcing bar. Here, the cylinder 44 of the upper frame UF that supports the heating means 4 is started, the frame 43 is lowered, the work coil 42 is lowered, and the work coil 42 is stopped in a state of being arranged in front of the tip of the reinforcing bar. . Following this, the first slider 21 is started and moved forward, and the tip portion of the reinforcing bar is placed inside the work coil 42. The amount of movement in this advance is a controlled distance, and the range of the reinforcing bar to be heated is determined by the advance. In this state, a high frequency current is supplied to the work coil 42 for a predetermined time, and the tip portion of the reinforcing bar is heated to a desired temperature.

  When this heating is completed, the first slider 21 is retracted and stopped in a state where the heated portion at the tip of the reinforcing bar is inserted into the center hole of the fixing member. The amount of backward movement is the optimum position calculated from the initial value. The optimum position varies depending on the type or diameter of the reinforcing bar, and the position where the high strength can be exhibited by repeating the experiment is set as the control value.

  Subsequently, the work coil 42 is raised together with the frame body 43, a space is provided in front of the tip of the reinforcing bar, and the compression head 32 is moved there. The compression head 32 is advanced by the servo motor 33 of the second slider 31 and further advances after contacting the tip of the reinforcing bar to compress the tip of the reinforcing bar. The amount of compression at this time (the amount of movement that moves forward from the state of contact with the tip of the reinforcing bar) is adjusted by the servo motor 32 of the second slider 31. Then, the compression is terminated when the compression amount reaches a predetermined amount. If the cylinder 7 of the reinforcing bar holding part 5 is operated again to release the holding of the reinforcing bars, the reinforcing bars can be taken out from the apparatus, and the processing is finished.

  During compression, there may be a case where only the compression head 32 is moved, but there is also a case where the second slider 2 is slightly advanced. This is because, since the position of the fixing member is fixed, the position of the fixing member and the reinforcing bar is adjusted, and at the same time, an expansion portion is formed on the reinforcing bar main body side. The timing and amount of movement of the first slider 21 are controlled based on the position information of the compression head 32.

  As described above, when processing the same type of fixing rebar by controlling each drive system by the control device, the heating state is constant and the compression state is performed in the same manner. The quality of the finished product can be stabilized.

  The embodiments of the apparatus and method of use according to the present invention are as described above, but various modes can be taken without departing from the spirit of the present invention. For example, the work coil 42 constituting the heating unit 4 is configured to move the frame body 43 up and down from the upper frame UF of the base B and move to the tip of the reinforcing bar, but the frame body 43 is moved from a lower position of the base B. It can also be configured to move up and down. At this time, when the work coil 42 moves up, the work coil 42 moves to the position of the reinforcing bar and moves down to operate so as to escape from the tip of the reinforcing bar.

  In addition, the clamp portions 61 and 62 shown in FIG. 4 have the reinforcing bar abutting portions 67 and 68 cut out in a V shape, but the portions adjacent to the upper and lower sides thereof are formed in parallel and the parallel surfaces are formed. The structure which clamps a reinforcing bar with a surface may be sufficient. If the reinforcing bar can be clamped in a portion corresponding to a predetermined length in the longitudinal direction, the reinforcing bar is disposed at a predetermined position.

DESCRIPTION OF SYMBOLS 1 Fixing member holding means 2, 3 Compression means 4 Heating means 5 Rebar holding means 7 Advance / Retreat member (hydraulic cylinder)
DESCRIPTION OF SYMBOLS 11 Main part of fixing member holding means 12 Holding parts 13 and 14 of fixing member holding means Contact surface parts 15 and 16 Positioning member 21 First slider 22 Decelerators 23 and 33 Motor (servo motor)
30 Second slider main body 30a Main body tip 31 Second slider 32 Compression head 41 High frequency alternator 42 Work coil 43 Frame 44 Hydraulic cylinder 45 Arms 46, 47 Restricting parts 48, 49 Lowering stoppers 51, 51 Vise base 53 , 54 Opposite ends 55 of the vise base 55, concave groove 57 of the vise base 57 Reinforcing bar receivers 61, 62 Clamping parts 63, 64 Sliding contact surfaces 65, 66 Clamping protrusions 67, 68 Reinforcing bar contact part A Processing equipment B Base C Reinforcing bar D Fixing member HFU High frequency power supply unit (high frequency oscillator)
L1, L2 Rail UF Upper frame

Claims (6)

A fixing rebar processing device in which a fixing member is disposed in a hook shape at or near the tip of a rebar,
A fixing member holding means fixedly held at a predetermined position of the base, and holding the fixing member; compression means arranged separately on both sides around the fixing member holding means; and a predetermined end portion of the reinforcing bar Heating means for heating the range,
The fixing member holding means has a gap corresponding to the thickness of the fixing member, and has a contact surface portion that contacts the both surfaces of the fixing member while making the position of the center hole of the fixing member coincide with the axis of the reinforcing bar. Prepared,
The compression means includes a first slider that can place the reinforcing bar with the tip of the reinforcing bar to be processed facing the fixing member holding means, and that can advance and retreat in the axial direction of the reinforcing bar, and the front of the reinforcing bar from the front in the tip direction. A second slider capable of moving forward and backward toward the tip of the reinforcing bar, a reinforcing bar holding portion provided on the first slider, and a compression head provided on the tip of the second slider,
The reinforcing bar holding part of the compression means is fixed to the first slider and is arranged separately on both sides of the position where the reinforcing bar should be held, and the opposite end of the vice base holds the fixing member. A sliding restricting portion that inclines so as to gradually expand toward the side of the means, a clamp portion that can slide along the sliding restricting portion, and a long length provided on the opposing end face of the clamp portion. Reinforcing bar abutting portion having a V-shaped cross section and driving for driving the clamp portion so as to advance and retreat toward the fixing member held by the fixing member holding means while being independent of the first slider on the first slider. And when the clamp part is retracted by the driving means, the opposing surface of the clamp part approaches and the reinforcing bar abutting part sandwiches the reinforcing bar,
The heating means includes a high-frequency power supply unit, a work coil that generates a magnetic field by a high-frequency current supplied from the high-frequency power supply unit, and an elevating means that is installed above a base and raises and lowers the work coil .
The first slider moves forward so that the reinforcing bar is inserted through the center hole of the fixing member held by the fixing member holding means and the inside of the work coil. . The second slider is formed in a columnar shape and can be moved back and forth along the columnar center line, and is held by the center hole of the fixing member held by the fixing member holding means and the reinforcing bar holding portion. 2. The fixing rebar processing device according to claim 1 , wherein the position of the axis of the rebar is adjusted so that the center line of the second slider is disposed on a reference extension line. . The raising and lowering means of the heating means includes a frame body supported by the upper frame of the base and a cylinder for raising and lowering the frame body, and the upper frame includes a restricting portion that partially penetrates the frame body; A lowering stopper provided in the restricting portion, and a high-frequency current transformer is mounted on the frame body, and the work coil is formed in a spiral shape with the arm electrode interposed therebetween. It is configured integrally with a high-frequency current transformer, and is arranged outside and below the frame body. The frame body descends along the restriction portion of the upper frame and reaches a predetermined position by the lowering stopper. when lowered, the processing device of the fixing reinforcement according to claim 1 or 2 the work coil is characterized in that it is adjusted to stop at the position of the axis of the reinforcing bar. The first slider and the second slider are first and second sliders driven by individual servo motors, respectively, and further include a control device for controlling the movement amount of the first and second sliders. The fixing rebar processing apparatus according to any one of claims 1 to 3, wherein the fixing rebar processing apparatus is provided. 5. A method of using the fixing bar processing apparatus according to claim 1, wherein the fixing member is held by a fixing member holding means, the reinforcing bar is held by a reinforcing bar holding part of the first slider, and One slider is pushed to insert the rebar into the fixing member, the work coil is moved up and down and stopped at a predetermined position, and then the rebar is further pushed to insert the tip of the rebar into the work coil. The high frequency current is supplied to the work coil to heat the tip of the rebar, and the rebar is retracted until it is released from the work coil, and then the work coil is lifted and separated from the rebar tip to propel the second slider. A method for using a processing apparatus for fixing steel bars, wherein the tip of the steel bars is compressed by a compression head. 5. A method of using the fixing rebar processing device according to claim 4, wherein the fixing member is held by the fixing member holding means, and the compression head is positioned at the tip position of the reinforcing bar installed with reference to one surface of the fixing member. The front end surface of the reinforcing bar is made to coincide with each other, the reinforcing bar is held by the reinforcing bar holding part of the first slider, the first slider is propelled to insert the reinforcing bar into the fixing member, and the front end of the reinforcing bar is inserted into the compression head. After stopping at the position where it abuts the tip surface and inputting this stop position as a reference position to the control device, the compression head is retracted, the work coil is moved up and down, and then the first slider is propelled by a predetermined distance. The tip of the reinforcing bar is inserted into the work coil, a high-frequency current is supplied to the work coil to heat the tip of the reinforcing bar, and the reinforcing bar is detached from the work coil. Use of a fixing rebar processing device, wherein the work coil is moved up and down to be separated from the rebar tip, the second slider is pushed a predetermined distance, and the rebar tip is compressed by the compression head Method.

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