JP2020197104A - Induction heating and welding device - Google Patents

Abstract

To provide an induction heating and welding device allowing simple and proper pressing work by using an incorporated pressing pad.SOLUTION: An induction heating and welding device 2 has a heating coil 6 induction-heating a welding object, a power supply part 61 supplying current to the heating coil 6, a housing 20 housing the heating coil 6 and the power supply part 61, a pressing pad 5 attached to a lower end 23 of the housing 20 and having an abutment face abutting on the welding object, a press-operation tool 3 operated to be displaced from a first position to a second position, and a pressing spring 30 pressing the pressing pad 5 to the welding object by a spring force defined by the displacement of the press-operation tool 3.SELECTED DRAWING: Figure 2

Description

The present invention relates to an induction heating and welding device that welds a welding target by inducing and heating the welding target and pressing the welding target.

In waterproofing work for construction work or civil engineering work, for example, waterproofing work for flat roofs, etc., a conductive fixing member having a heat-welding layer on the surface is fixed to the surface of the skeleton, and the fixing member is fixed from the surface side of the tarpaulin stretched on the skeleton. There is known a construction method in which the waterproof sheet is fixed on the skeleton by inducing heating and pressing the waterproof sheet against the fixing member. In this construction, the objects to be welded are a tarpaulin and a fixing member.

For example, in Patent Document 1, an electromagnetic heating coil unit having a base having a holding surface facing a welding object and a heating coil, a feeding unit for supplying an electric current to the electromagnetic heating coil unit, and a base are mounted on the base. An induction heating welding device including a pressing pad is disclosed. In the adhesive fixing construction of the waterproof sheet using this induction heating welding device, the waterproof sheet is subjected to induction heating by an electromagnetic heating coil unit while maintaining the posture in which the pressing pad is in contact with the portion above the fixing member of the waterproof sheet. And the fixing member are welded together. The waterproof sheet and the fixing member are welded by pressing the pressing pad against the fixing member in the same posture for a while after the induction heating is completed.

Japanese Unexamined Patent Publication No. 2016-110824

In the pressing operation against the welding object using the pressing pad of the induction heating welding device as disclosed in Patent Document 1, the pressing pressure is an important factor for determining the welding state of the welding object. For example, if the object to be welded is a sheet material and a fixing member, if the pressing pressure is too small, there arises a problem that the object to be welded is insufficiently welded.
In view of such circumstances, an object of the present invention is to provide an induction heating and welding device in which a pressing operation can be easily and appropriately performed by using a built-in pressing pad.

The induction heating welding apparatus according to the present invention induces and heats the object to be welded and presses the object to be welded to weld the object to be welded. This induction heating welding device includes a heating coil that induces and heats the object to be welded, a feeding portion that supplies an electric current to the heating coil, a housing that houses the heating coil and the feeding portion, and a lower end portion of the housing. With a pressing pad having a contact surface that comes into contact with the welding object, a pressing operating tool that is displaced from the first position to the second position, and a spring force defined by the displacement of the pressing operating tool. It includes a pressing spring that presses the pressing pad against the welding object.

According to this configuration, when the operator displaces the pressing operation tool from the first position to the second position during induction heating of the object to be welded by the heating coil, after induction heating, or both, the displacement causes the pressing operation tool. The pressing pad is pressed against the object to be welded by the specified spring force. By understanding the relationship between the displacement of the pressing operation tool and the spring force, the operator can easily press the welding object with an appropriate force or more via the spring and the pressing pad.

If a gap is created between the object to be welded and the contact surface of the pressing pad, the distance between the heating coil and the object to be welded (non-heated dielectric) becomes long, and heating becomes insufficient. Therefore, it is preferable that the induction heating is started when the pressing operation tool is displaced and the pressing pad presses the welding object with a sufficient pressing force. For this reason. In one of the preferred embodiments of the present invention, a heating switch that is turned on by the displacement of the pressing operation tool is provided, and the heating switch outputs a start signal that starts power supply to the heating coil by the ON operation. To do.

When the pressing pad presses the object to be welded, it is preferable that the pressing pressure due to the operation displacement of the pressing operating tool is generated on the contact surface of the pressing pad as uniformly as possible. Further, it is preferable that induction heating is started when the contact state between the contact surface and the object to be welded becomes good due to the generation of a pressing pressure equal to or higher than a predetermined value. In order to realize this, in one of the preferred embodiments of the present invention, the pressing operation tool is slidably mounted on the upper end portion of the housing along the vertical line of the contact surface, and the heating switch. Is attached to the housing so that it can be switched from OFF to ON by contact with the pressing operation tool during the sliding of the pressing operation tool.

In one of the preferred embodiments of the present invention, the pressing operation tool includes a slide rod penetrating a top wall forming an upper end portion of the housing, a pressing cap provided at the upper end of the slide rod, and the slide. A switch operating body provided at the lower end of the slide rod is provided so that the heating switch is turned on according to the slide displacement of the rod, and the pressing spring is arranged between the pressing cap and the top wall. ing. In this configuration, the top wall of the housing is used as a guide member for the displacement operation of the pressing operation tool, and stable pressing operation is possible. In addition, since the pressing cap manually operated by the operator is placed in a free space above the housing, operability is good, a stable posture is ensured, and the contact surface of the pressing pad is used as the welding target. Can be pressed. Further, since the heating switch and the pressing spring are arranged in the housing covered by the top wall, it is possible to prevent a malfunction due to unexpected contact or dust.

When the object to be welded is composed of a fixing member to be heated and a sheet material covering the fixing member, it is difficult to visually recognize the fixing member from above the sheet material. If the heating coil deviates from the proper position with respect to the member to be heated, proper induction heating becomes impossible. Therefore, it is preferable to detect the position of the member to be heated by using the sensor coil. It is necessary to arrange the detection coil at a position where the detection accuracy of the detection coil is not easily lowered by the heating coil. However, as the detection coil is arranged farther from the heating coil, the size of the induction heating welding device becomes larger, which hinders the compactification of the induction heating welding device. Therefore, in one of the preferred embodiments of the present invention, a misalignment detection coil for detecting a misalignment between the welding object and the heating coil is arranged between the pressing pad and the heating coil. There is. In this configuration, since the detection coil is arranged at a position closer to the welding target than the heating coil, the influence of the heating coil on the detection of the welding target by the detection coil is small.

If the detection coil itself is misaligned, the accuracy of position detection with respect to the object to be welded decreases, so the detection coil must be held accurately and stably. Therefore, in one of the preferred embodiments of the present invention, the detection coil is fitted in a recess formed on the lower surface of the resin plate, and the resin plate is placed between the heating coil and the pressing pad. It is attached to the lower end of the housing so as to be located. In this configuration, the movement of the detection coil is regulated by the wall surface forming the recess of the resin plate, so that the detection coil can be held in a predetermined posture. At that time, when the resin plate is mounted so that the lower surface of the resin plate is in contact with the upper surface of the pressing pad, the detection coil is surrounded by the wall surface forming the recess and the upper surface of the pressing pad. It is held stable.

It is a perspective view which shows the heat welding management apparatus, the induction heating welding apparatus, the waterproof sheet, and the fixing member. It is a vertical cross-sectional view of an induction heating welding apparatus. It is a vertical cross-sectional view of the induction heating welding device in the skirt unit region, the right side of the center line is a vertical cross-sectional view cut at the surface passing through the resistance spring, and the left side of the central axis is cut at the surface passing through the locking pin. It is a vertical sectional view. It is a top view of the resin plate. It is a top view which shows the positional relationship of a resin plate, a heating coil, a misalignment detection coil, and ferrite. It is a top view of the skirt unit. It is a side view of a skirt unit. It is a functional block diagram which shows the control function provided in the heat welding management apparatus and the induction heating welding apparatus.

In the present specification, "upper, upper, heaven" or "lower, lower, bottom" is a positional relationship in the vertical axis direction (vertical direction) of the main body of the apparatus, and is the height from the welding object. Shows the relationship.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an induction heating welding device 2 that welds an object to be welded by inducing and heating the object to be welded and pressing the object to be welded. In the induction heating welding device 2 according to this embodiment, the functional unit that manages the heating welding work is separately configured as the heating welding management device 1, and the heating welding management device 1 and the induction heating welding device 2 are the power lines. It is connected by a connection cable CA including a control line. Of course, the function of the heat welding management device 1 may be incorporated into the induction heating welding device 2 so that the heating welding operation can be performed by the induction heating welding device 2 alone.

The heat welding management device 1 includes a power supply unit 11, a GNSS unit 12, a data logger unit 13, an environmental temperature detection unit 14, an operation panel 15, a display panel 16, and the like. The power supply unit 11 receives commercial power or private power generation as an input, and outputs AC power required for induction heating to the induction heating and welding device 2. The GNSS unit 12 calculates the position coordinates of the heat welding location using a satellite positioning system. Since the position coordinates calculated by this are the positions of the antenna (not shown), only the antenna may be provided in the heat welding management device 1. The data logger unit 13 includes the position coordinates of each heat welding place and the data of the heat welding work performed there (work environment temperature, work date and time, heating intensity, heating time, position of the induction heating welding device 2 and the welding object). Record the deviation, the temperature of the object to be welded, etc.). The environmental temperature detection unit 14 detects the working environment temperature. Various operation buttons, operation switches, and various notification lamps are arranged on the operation panel 15. The display panel 16 is a liquid crystal display for visually informing information to the operator.

FIG. 1 shows a state in which the induction heating welding device 2 welds a waterproof sheet SH to a fixing member FX fixed to a concrete waterproof base on a rooftop or the like by an anchor or the like. In this embodiment, the objects to be welded are the fixing member FX and the portion of the waterproof sheet SH that covers the fixing member FX. The fixing member FX here is a circular conductor, and is made of, for example, a steel plate. On the upper surface of the fixing member FX, a planar hot melt adhesive layer made of a thermoplastic synthetic resin such as a polyester resin is formed as a heat welding layer for the waterproof sheet SH. The fixing member FX is arranged on the slab main body at a large number of fixing points at predetermined intervals in the vertical and horizontal directions. The operator welds the waterproof sheet SH to the fixing member FX by inducing heating the fixing member FX while pressing the upper surface of the fixing member FX with the waterproof sheet SH sandwiched by using the induction heating welding device 2.

As shown in FIG. 2, the induction heating welding device 2 includes a heating coil 6 that induces and heats the fixing member FX, a feeding unit 61 that supplies the current sent from the power supply unit 11 to the heating coil 6, and the heating coil 6. A housing 20 for accommodating the power supply unit 61 and the power feeding unit 61 is provided.

The housing 20 has a cylindrical body portion 21 having a central axis CL, an upper end portion 22 connected to the upper end of the body portion 21, and a lower end portion 23 connected to the lower end of the body portion 21. A second connector box 19b to which the connection cable CA is connected is formed on the side wall of the body portion 21. The upper end portion 22 is a top wall that closes the upper portion of the housing 20. An upper accommodating chamber 22a is formed on the lower surface side of the upper end portion 22, and an annular protrusion 22b is formed on the upper surface side of the upper end portion 22. The lower end 23 is a bottom wall that closes the lower part of the housing 20. A lower accommodating chamber 23a is formed on the upper surface side of the lower end portion 23, and a circular bottom recess 23b is formed on the lower surface side of the lower end portion 23. A rotary handle 24 is provided on the peripheral wall of the upper end portion 22.

As shown in FIG. 3, the heating coil 6 is a coil wound thinly and flatly around the central axis CL, and is housed in the bottom recess 23b of the lower end portion 23. The heating coil 6 is held in the bottom recess 23b in a state of being sandwiched between the thin resin plate 64 mounted on the end surface 23c of the lower end portion 23 and the ferrite 65. The resin plate 64 is mounted so as to be flush with the end face 23c, and the pressing pad 5 made of silicon rubber is mounted on that face. That is, the lower surface of the pressing pad 5 is also the lower surface of the induction heating and welding device 2, and is a contact surface 50 that can be contacted with the waterproof sheet SH located on the fixing member FX. A heating coil 6 is arranged on the pressing pad 5 with a resin plate 64 sandwiched therein, and a ferrite 65 is arranged on the pressing pad 5.

As shown in FIG. 4, the resin plate 64 is a disk on which four circular recesses 640 distributed at an inscribed angle of 90 degrees are formed. A circular misalignment detection coil 63 that functions as a misalignment sensor is arranged in each circular recess 640. A wiring groove 641 connected to each circular recess 640 is formed for the detection signal wiring of the misalignment detection coil 63.

The pressing force during heating is transmitted to the heating coil 6 via the lower surface of the lower end portion 23 and the ferrite 65, and is further transmitted to the resin plate 64 and the misalignment detection coil 63.

The inner diameter of the circular recess 640 is set to be slightly larger than the outer diameter of the misalignment detection coil 63. This facilitates the work of mounting the detection coil 63 in the circular recess 640. Further, when a pressing force acts on the detection coil 63, the detection coil 63 is allowed to spread slightly outward, and the spread beyond a predetermined value is restricted. As a result, the detection coil 63 during the induction heating welding operation is held in an appropriate posture. Further, the depth of the circular recess 640 is set to be smaller than or substantially the same as the thickness of the misalignment detection coil 63. As a result, when the pressing force is applied to the detection coil 63, the detection coil 63 is restricted from being deformed in the acting direction of the pressing force, and the pressing force is evenly applied to the entire surface of the detection coil 63. This also contributes to keeping the detection coil 63 in an appropriate posture during the induction heating welding operation.

As shown in FIG. 5, the ferrite 65 has a rectangular shape in a plan view, and is arranged so as to extend in the radial direction of the misalignment detection coil 63 above each misalignment detection coil 63 with the heating coil 6 interposed therebetween. Has been done.

As shown in FIG. 2, a power feeding unit 61 and a misalignment calculating unit 62 are housed inside the body portion 21 of the housing 20. The power feeding unit 61 supplies the AC power transmitted through the connection cable CA and the second connector box 19b to the heating coil 6 at a predetermined timing. The misalignment calculation unit 62 uses the detection signals from the four misalignment detection coils 63 to determine whether the central axis CL of the induction heating welding device 2 coincides with the center of the fixing member FX, that is, fixing the heating coil 6. The degree of deviation with respect to the member FX is calculated. The determination result by the misalignment calculation unit 62 is displayed on the display panel 16 provided on the upper surface of the second connector box 19b. In this embodiment, the display panel 16 includes a notification lamp for notifying the misalignment. The misalignment notification lamp is lit so as to guide the heating coil 6 directly above the fixing member FX. If the heating coil 6 is misaligned with respect to the fixing member FX, an error lamp indicating the misalignment direction lights up, and if the heating coil 6 is not misaligned with respect to the fixing member FX, an OK lamp is lit. Lighting control may be used such that is lit.

As shown in FIG. 2, a pressing operation tool 3 is attached to the upper end portion 22 of the housing 20. The operator can use the pressing operation tool 3 to apply a strong pressing force to the pressing pad 5 in contact with the waterproof sheet SH on the fixing member FX.

The pressing operation tool 3 includes a pressing cap 31, a slide rod 32, and a switch operating body 33. The slide rod 32 penetrates the top wall forming the upper end portion 22 coaxially with the central axis CL. The pressing cap 31 is provided at the upper end of the slide rod 32. The upper surface of the pressing cap 31 is curved in an arch shape so that it can be easily operated by the palm of the operator. An annular hole 31a is formed on the lower surface of the pressing cap 31 to allow the annular projection 22b of the upper end portion 22 to move forward and backward. As a result, when the pressing cap 31 is slide-displaced from the first position, which is the upper position, to the second position, which is the lower position, while being guided by the annular protrusion 22b and the annular hole 31a, the slide rod 32 also interlocks. And slide down. The switch operating body 33 is provided at the lower end of the slide rod 32 inside the upper accommodation chamber 22a. The switch operating body 33 is a disk whose lower peripheral edge is chamfered.

A pressing spring 30 is arranged between the lower surface of the pressing cap 31 and the top wall forming the upper end portion 22. In FIG. 2, the pressing spring 30 is arranged so as to surround the slide rod 32, but instead, the pressing spring 30 is arranged in the annular hole 31a so that the spring pressure acts near the outer circumference of the pressing cap 31. You may. The pressing spring 30 is set to urge the upward displacement (displacement to the first position) of the pressing cap 31. Conversely, the pressing spring 30 is set to oppose the downward displacement (displacement to the second position) of the pressing cap 31. With this configuration, when the operator displaces the pressing cap 31 downward and holds the pressing cap 31 at a predetermined displacement position, the compressed pressing spring 30 has a spring force defined according to the spring displacement. Press the pressing pad 5 against the waterproof sheet SH with. As a result, the waterproof sheet SH comes into close contact with the fixing member FX. The pressing cap 31 is naturally held at a position (first position) where the stopper 32a provided on the slide rod 32 abuts on the upper end portion 22 by the urging force of the pressing spring 30.

Inside the upper accommodation chamber 22a, a heating switch 34 including a micro switch that is turned ON / OFF is further provided. The heating switch 34 is connected to the power feeding unit 61. Due to the slide displacement of the pressing cap 31 from the first position to the second position, the switch operating body 33 also descends, and in the middle of the slide displacement, it comes into contact with the lever of the heating switch 34, and the heating switch 34 is turned on. Since the ON signal of the heating switch 34 becomes the start signal of the power supply by the power supply unit 61, the power supply unit 61 that has received the ON signal causes a predetermined alternating current to flow through the heating coil 6. As a result, the induction heating of the fixing member FX by the heating coil 6 is started.

The induction heating and welding device 2 includes a non-contact temperature sensor 7 (for example, an infrared method) that detects the surface temperature of the waterproof sheet SH, and a temperature measurement that calculates the surface temperature based on the detection signal of the temperature sensor 7. A circuit 70 is provided. The temperature sensor 7 and the temperature measurement circuit 70 need to be arranged at a position as far as possible from the heating coil 6 so as not to receive signal interference due to the excitation of the heating coil 6 as much as possible. Therefore, the infrared passage path formed between the temperature sensor 7 and the waterproof sheet SH becomes long. In order to secure this infrared passage, a first through hole 23d (see FIG. 2) is provided in the lower end portion 23 of the housing 20, a second through hole 642 (see FIG. 4) is provided in the resin plate 64, and a pressing pad is provided. No. 5 is provided with a third through hole 51 (see FIG. 2). Further, as shown in FIG. 5, the heating coil 6 is divided into an inner coil portion and an outer coil portion, and the winding of the outermost circumference of the inner coil portion and the winding of the innermost circumference of the outer coil portion are formed. Due to the widening of the interval, a gap SP is formed between the inner coil portion and the outer coil portion. With this structure, the infrared passage of the temperature sensor 7 is created by the first through hole 23d, the gap SP, the second through hole 642, and the third through hole 51 (see the alternate long and short dash arrow in FIG. 2). The surface temperature data measured by the temperature measuring circuit 70 is sent to the power feeding unit 61 and the data logger unit 13 of the heat welding management device 1.

As shown in FIG. 3, a skirt unit 8 is provided at the lower end 23 of the housing 20. The inner peripheral shape of the skirt unit 8 substantially matches the outer peripheral dimensions of the fixing member FX including the waterproof sheet SH. When the tip of the skirt unit 8 is fitted to the fixing member FX covered with the waterproof sheet SH, the contact surface 50 of the pressing pad 5 is appropriately positioned above the fixing member FX. In this embodiment, the outer contours of the contact surface 50 and the fixing member FX are circles of substantially the same size.

The skirt unit 8 has a skirt body 81. The skirt body 81 is a cylindrical body mounted on the outer peripheral surface of the lower end portion 23 so as to be slidable along a vertical straight line (corresponding to the central axis CL) passing through the center of the contact surface 50. The inner diameter of the skirt body 81 is a length obtained by adding a length of 2 to 3 times the thickness of the waterproof sheet SH to the outer diameter of the fixing member FX. The skirt body 81, the pressing pad 5, and the heating coil 6 are coaxially arranged with respect to the central axis CL. As a result, when the tip of the skirt body 81 is fitted to the fixing member FX with the waterproof sheet SH interposed therebetween, the center of the fixing member FX, the center of the skirt body 81, and the center of the pressing pad 5 and the heating coil 6 are substantially aligned. Match. The posture of the induction heating welding device 2 at this time is an appropriate position for induction heating of the fixing member FX.

As shown in FIG. 3, when the skirt unit 8 is further pressed downward in a state where the heating coil 6 and the fixing member FX are aligned with each other, the skirt body 81 moves along the central axis CL. (Indicated by the dotted line in FIG. 3), the contact surface 50 of the pressing pad 5 is in close contact with the surface of the waterproof sheet SH. In the sliding stroke ST of the skirt body 81, the position where the lower end of the skirt body 81 protrudes from the contact surface 50 by a predetermined length (several mm to a dozen mm) and the lower end of the skirt body 81 substantially coincide with the contact surface 50. It is the length between the position. If the skirt body 81 slides upward with a light force, the skirt body 81 cannot be aligned by being shallowly fitted to the fixing member FX, so that resistance is applied to the upward sliding of the skirt body 81 with respect to the lower end portion 23. A means of resistance to give is needed. In this embodiment, the resistance means is composed of a resistance spring 80 arranged between the lower end 23 and the skirt body 81. More specifically, the resistance spring 80 is an elongated coil spring. A pneumatic spring or a fluid pressure spring may be used as the resistance means.

As shown in FIGS. 3 and 6, one end of the resistance spring 80 is inserted into a vertical hole 82 that functions as a spring receiving portion formed in the skirt body 81, and one end of the resistance spring 80 is a lower end portion 23. It is in contact with the lower surface of the flange portion 23e formed on the peripheral wall of the above. As a result, spring resistance acts against the upward sliding of the skirt body 81.

As a result of experiments, it has been found that a spring force of 1 N / square cm or more is suitable as the spring force.

As shown in FIGS. 3, 6, and 7, the skirt body 81 is formed with a J-shaped pin guide groove 84 that is open at the upper end of the skirt body 81. Further, the locking pin 83 is screwed into the peripheral wall of the lower end portion 23 in the radial direction. The width of the pin guide groove 84 is a width into which the locking pin 83 can be inserted. In FIG. 3, the vertical cross section cut on the surface passing through the resistance spring 80 is shown on the right side of the central axis CL, and the vertical cross section cut on the surface passing through the locking pin 83 is shown on the left side of the central axis CL. It is shown. The pin guide groove 84 is connected to a first groove 841 that opens at the upper end of the skirt body 81 and extends in the axial direction, a second groove 842 that is connected to the first groove 841 and extends in the circumferential direction, and a second groove 842. It is composed of a third groove 843 extending in the axial direction. The head of the locking pin 83 enters through the opening of the first groove 841. The skirt body 81 slides upward by the guidance of the locking pin 83 and the first groove 841. Further, the skirt body 81 is rotated so that the locking pin 83 moves from the lower end of the first groove 841 to the second groove 842. When the locking pin 83 enters the third groove 843, the skirt body 81 is urged downward by the resistance spring 80, but when the locking pin 83 contacts the upper end of the third groove 843, the skirt The downward sliding of the body 81 is restricted. That is, the locking pin 83 and the upper end of the third groove 843 function as a locking tool that limits the protruding length when the skirt body 81 projects downward from the pressing pad 5 to a predetermined value.

The spring force of the resistance spring 80 is the resistance force when the skirt body 81 is slid upward. The spring force of the pressing spring 30 is a pressing force generated by the operation of the pressing cap 31. Therefore, if the spring force of the resistance spring 80 is larger than the spring force of the pressing spring 30, the skirt body 81 exerts the pressing force set by the pressing spring 30 when the pressing pad 5 and the heating coil 6 are aligned. The waterproof sheet SH will be pressed with a force that exceeds it. This leads to deformation of the tarpaulin SH. Therefore, the spring force of the resistance spring 80 in the central axis CL direction is set to be weaker than the spring force of the pressing spring 30 in the central axis CL direction.

As shown in FIG. 8, the heat welding management device 1 is provided with a first control unit 10a that controls the heat welding process on the heat welding management device 1 side. The first control unit 10a is connected to the power supply unit 11, the GNSS unit 12, the data logger unit 13, the environmental temperature detection unit 14, the operation panel 15, and the display panel 16 described above.

The induction heating welding device 2 is provided with a second control unit 10b that controls the heating welding process on the induction heating welding device 2 side. The second control unit 10b is connected to the power feeding unit 61, the heating switch 34, the misalignment calculation unit 62, the misalignment display panel 66, and the temperature measurement circuit 70 described above.

Power for induction heating is sent from the heat welding management device 1 to the induction heating welding device 2, and induction heating data and various signals are sent from the induction heating welding device 2 to the heat welding management device 1. For such input / output of electric power, data, and signals, the heating and welding management device 1 is provided with a first connector box 19a, and the induction heating and welding device 2 is provided with a second connector box 19b. The first connector box 19a is connected to the first control unit 10a and the power supply unit 11, and the second connector box 19b is connected to the second control unit 10b and the power supply unit 61. The first connector box 19a and the second connector box 19b are connected by a connection cable CA.

Induction heating for the fixed member FX is performed by supplying the electric power generated by the power supply unit 11 to the heating coil 6 by the power feeding unit 61. The power supply unit 11 converts the AC power of the commercial power source into the induction heating power based on the control command from the first control unit 10a. The power specification for induction heating is calculated based on the thickness of the tarpaulin SH and the environmental temperature detected by the environmental temperature detection unit 14 input through the operation panel 15.

The induction heating power is sent to the power feeding unit 61 via the first connector box 19a, the connection cable CA, and the second connector box 19b. The power feeding unit 61 supplies the induction heating power to the heating coil 6 in response to the ON operation of the heating switch 34. The stop timing of the induction heating, that is, the power supply stop timing to the heating coil 6 is determined by the preset heating time, and the power supply stop timing is determined by the surface temperature of the waterproof sheet SH measured by the temperature measurement circuit 70. It may be adjusted.

When the determination of the power supply stop timing is entrusted to the operator, the timing at which the heating switch 34 is switched from ON to OFF is used. The heating switch 34 is released by the operator releasing the force on the pressing cap 31, returning the pressing cap 31 to the first position, sliding displacement, and releasing the contact between the switch operating body 33 and the lever of the heating switch 34. It switches from ON to OFF.

The second control unit 10b sends data such as supply time data of induction heating power, data indicating the state of the heating switch 34, and measurement result data of the temperature measurement circuit 70 to the data logger unit 13. The first control unit 10a sends the positioning data from the GNSS unit 12, the environmental temperature data by the environmental temperature detection unit 14, the specification data of the induction heating power generated by the power supply unit 11, and the like to the data logger unit 13. The data logger unit 13 records the received data in a memory in a predetermined format for each induction heating point. The second control unit 10b can generate various error data (for example, coil error, coil abnormally high temperature, voltage error, sensor failure, seat abnormally high temperature, etc.), and these error data are transmitted to the first control unit 10a. It is sent and displayed on the display panel 16 as appropriate. Further, the error data is also sent to the data logger unit 13 and stored together with the positioning data.

[Another Embodiment]
(1) In the above-described embodiment, the device for inducing heat welding of the object to be welded is divided into a heat welding management device 1 and an induction heat welding device 2. Instead of this, the heat welding management device 1 may be incorporated in the induction heating welding device 2. Further, at least one functional part of the induction heating welding device 2 in the above-described embodiment may be transferred to the heating welding management device 1, and conversely, at least one functional part of the heat welding management device 1 may be transferred to the induction heating welding device 1. You may move to 2.

(2) In the above-described embodiment, the objects to be welded are the fixing member FX and the waterproof sheet SH welded to the fixing member FX, but other than the induction heating body other than the fixing member FX and the sheet material. It may be combined with an object to be welded.

(3) In the above-described embodiment, the induction heating is started by turning on the heating switch 34 by pushing down the pressing cap 31. Instead of this, ON / OFF of the heating switch 34 may be used for confirming the pressing pressure on the pressing pad 5, and the induction heating may be started by another operating tool.

(4) Each functional unit shown in FIG. 8 is divided for convenience for the purpose of explanation, and any plurality of functional units may be integrated or each functional unit may be further divided.

(5) In the above-described embodiment, the fixing member FX is fixed to a waterproof base made of concrete. In the fixing member FX, in addition to the concrete slab, the precast concrete base may be fixed to a waterproof base made of another material such as metal. Further, the waterproof base on which the fixing member FX is fixed may be a vertical surface such as a vertical wall or an inclined surface in addition to the horizontal surface.

(6) The fixing member FX may have a shape other than a circle, for example, a rectangle or a square. The material of the fixing member FX may be other than the steel plate.

(7) The temperature sensor 7 is not a non-contact type sensor, but may be a contact type sensor, for example, a bimetal sensor or a thermistor sensor.

(8) In the above-described embodiment, the embodiment in which the object to be welded by the induction heating welding device is the fixing member FX and the waterproof sheet is exemplified, but the object to be welded may be another object.

The present invention can be applied to an induction heating and welding apparatus that welds a welding target by inducing and heating the welding target and pressing the welding target.

2: Induction heating welding device 20: Housing 3: Pressing operation tool 30: Pressing spring 31: Pressing cap 32: Slide rod 33: Switch operating body 34: Heating switch 5: Pressing pad 50: Contact surface 6: Heating coil 61: Power supply Part 62: Positional deviation calculation unit 63: Positional deviation detection coil 64: Resin plate 7: Temperature sensor 70: Temperature measurement circuit 8: Skirt unit 80: Resistance spring 81: Skirt body 82: Spring receiving part CL: Central axis FX: Fixed Member SH: Waterproof sheet

Claims (7)

An induction heating welding device that welds the welding target by inducing and heating the welding target and pressing the welding target.
A heating coil that induces and heats the object to be welded,
A power supply unit that supplies an electric current to the heating coil,
A housing for accommodating the heating coil and the power feeding unit,
A pressing pad mounted on the lower end of the housing and having a contact surface in contact with the welding object,
A pressing operation tool that is displaced from the first position to the second position,
A pressing spring that presses the pressing pad against the welding object with a spring force defined by the displacement of the pressing operating tool, and
Induction heating welding device equipped with. The induction heating welding device according to claim 1, wherein a heating switch that is turned on by the displacement of the pressing operation tool is provided, and the heating switch outputs a start signal for starting power supply to the heating coil by the ON operation. The pressing operation tool is slidably mounted on the upper end portion of the housing along the vertical line of the contact surface, and the heating switch comes into contact with the pressing operation tool during the sliding of the pressing operation tool. The induction heating welding device according to claim 2, which is attached to the housing so as to be switched from OFF to ON. The pressing operation tool turns on the slide rod penetrating the top wall forming the upper end portion of the housing, the pressing cap provided on the upper end of the slide rod, and the heating switch according to the slide displacement of the slide rod. A switch operating body provided at the lower end of the slide rod for operation is provided.
The induction heating welding device according to claim 2 or 3, wherein the pressing spring is arranged between the pressing cap and the top wall. The induction according to any one of claims 1 to 4, wherein a misalignment detection coil for detecting a misalignment between the welding object and the heating coil is arranged between the pressing pad and the heating coil. Heat welding device. The misalignment detection coil is fitted in a recess formed on the lower surface of the resin plate, and the resin plate is mounted on the lower end of the housing so as to be located between the heating coil and the pressing pad. The induction heating welding apparatus according to claim 5. The induction heating welding device according to claim 6, wherein the lower surface of the resin plate is in contact with the upper surface of the pressing pad.

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