JPH019114Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application This invention is a divided induction heating coil in which the induction heating coil is divided into a plurality of parts, and the material to be heated can be taken in and out by opening and closing the divided coils. The present invention relates to a contact surface cleaning device.

B. Summary of the invention In an induction heating coil in which a material to be heated is inserted into a plurality of divided coils by opening and closing the coil, a fluid jet nozzle is arranged toward the contact surface of the divided coil, and the contact surface By spouting fluid such as water, the contact surfaces of the divided coils are cleaned and foreign objects are removed, thereby ensuring good contact between the divided coils and eliminating electrical conduction defects, which may cause heat generation on the contact surfaces. It is the one that has been eliminated.

C. PRIOR ART It is already known to continuously manufacture pipes from strips using, for example, induction heating devices with high or medium frequencies. In the heating coil used in the induction heating device, a pipe material that is being formed as a material to be heated passes through the heating coil, and at this time, an induced current flows through both end edges of the pipe material.

Further explanation will be given with reference to FIGS. 3 to 6. FIG. 3 is a plan view showing an overview of the process of continuously manufacturing pipes from strips using an induction heating device.
In the figure, 20 is a pipe material 23 is a heating coil,
31 is a forming roll, and 22 is a squeeze roll. Then, move the pipe material 2 from the left side to the right side in Figure 3.
The pipe making process progresses as the 0 moves. Pipe material 20
The flat plate portion 20a is sequentially bent into a pipe shape by a plurality of forming rolls 21, and is then heated by the heating coil 2.
At this time, a high-medium frequency current flows through both end edges of the pipe to induce induction heating, and then the abutting portions of both edges are forge-welded by squeeze rolls 22 to form a pipe. 24 is a high frequency or medium frequency power source.

By the way, in the pipe manufacturing apparatus described above,
Prior to the start of pipe-making work, there is work in which various parts are adjusted by feeding a strip without welding and bending it into a pipe shape (this is called sheet-threading work).

In the above-mentioned plate passing operation, a large number of guide rollers for pipe forming are driven to rotate, and the strip plate pulled out from the uncoiler is moved forward and passed through while being formed into a pipe shape. Since both end edges of the tip 20b of the pipe material 20 shaped into a shape have not yet been welded,
As shown in FIG. 4, both ends of the forming roll 21 and the squeeze roll 22 that are abutted against each other become open, and the diameter thereof expands, making it impossible for the roll to pass through the inside of the heating coil 23. For this reason, the heating coil 23 has a structure that can be opened and closed left and right as a split coil, and the tip 20b of the pipe material 20 is passed through the split coil with the split coil opened left and right.
Further, the pipe material 20 is passed through a squeeze roll 22, and after being pressurized by the squeeze roll 22 to close both edges of the pipe material 20 to the state shown in FIG. 3, the divided coils are closed to form an integrated heating coil 23. is necessary.

If it is necessary to form the heating coil 23 as a split coil, there is an example shown in FIG. 5 in addition to the above. That is, in FIG. 5, when performing high-medium frequency surface hardening on the constricted portion 25b of the stepped shaft 25 as the material to be heated, since large diameter portions 25a and 25c exist on both sides of the constricted portion 25b, It is necessary to divide the heating coil 23.

In the above, when the heating coil 23 is formed in sections, the structure generally shown in FIG. 6 is used. That is, the heating coil 23 is the upper coil 23a, 23
b, lower coil 23c, and upper coils 23a, 23b each have a rising portion 23.
A conductor 27, which is mutually insulated by an insulating material 26, is sandwiched between a'' and 23b'' and tightened with a bolt 30. The conductor 27 is connected to a power source, and the upper coils 23a, 23b and the lower coil 23c are energized.

Upper coils 23a, 23b and lower coil 23c
each has arm portions 23a', 23b' and 23c', and the upper and lower coils are fixed using, for example, a clamp 28 as shown in FIG. Clamp 2
8 is rotatably provided on each of the arm portions 23a' and 23b' of the upper coils 23a and 23b using a shaft pin 31, and a tightening bolt 29 is provided at the tip of the clamp 28.

Then, the lower coil 23c is placed in the state shown by the broken line in FIG.
After lowering the pipe member 20 and positioning the pipe material 20 whose tip part is expanding inside the heating coil 23, the lower coil 23c is inserted into the upper coil 23 as shown by the solid line in the figure.
Bolt 29 of clamp 28 in combination with a and 23b
Then, the arm portions 23a', 23b' and 23c' are tightened together and energized.

D Problems to be solved by the invention In the above, a relatively large current is often passed through the heating coil 23, and depending on the size of the material to be heated 20 or 25, a current of several thousand amperes or more may be passed through the heating coil 23. However, there was a risk that the contact surface 23d between the upper and lower coils would cause poor contact, leading to a major accident. That is, the heated material 20 or 2
Oxidized scale and the like are generated on the surface of the upper coils 23a and 23 due to heating, but these foreign substances are
If the clamp 28 or the like is used to tighten the contact surface 23d between the upper coil 23a and the lower coil 23c, failures such as poor conduction will occur.
When assembling and tightening the lower coil 3b and the lower coil 23c, great care must be taken to clean the contact surface 23d.

An object of the present invention is to provide a contact surface cleaning device for a split induction heating coil that can easily and reliably remove foreign matter and clean the contact surface.

E Means for Solving the Problems The present invention provides an induction heating coil in which the coil portion is divided into a plurality of parts, and a material to be heated is inserted into the inside of the divided coil by opening and closing the divided coils. This is a contact surface cleaning device for a divided induction heating coil in which a fluid jet nozzle is disposed toward the contact surface of the divided coil.

F Effect: Before closing the split coil, fluid is ejected from the jet nozzle toward the contact surface of the split coil to remove foreign matter such as oxide scale existing on the contact surface and ensure contact between the contact surfaces. be able to.

G. Embodiment The present invention will be explained below based on the embodiment shown in FIGS. 1 and 2.

FIG. 1 is a sectional view of the main parts of the present invention, and FIGS. 2A and 2B are a front view and a side view of the entire device. In each figure, reference numeral 5 denotes a pair of conductors placed with the insulating plate 4 in between.The conductors 5 are connected to the output terminal of the matching transformer 3 at the upper side, and are extended downward from there. 6 is a cooling water pipe for cooling the conductor 5 with water. The heating coil 1 has a divided configuration and consists of upper coils 1a, 1b and lower coil 1c connected via rising portions 1a'', 1b'' at the lower ends of the conductor 5. The upper coils 1a and 1b are fixedly supported by first, second, and third hollow supports 7, 8, and 9 provided in pairs, respectively, while the lower coil 1c extends inside the third hollow support 9. It is supported by an actuation rod 11 that moves up and down. The actuating rod 11 and the hollow support 9 are made of an insulating material so as not to be affected by electromagnetic force.

To explain further, the ends of the first, second, and third hollow supports 7, 8, and 9 are integrally connected, and the upper part of the first hollow support 7 is the upper part where the induction heating device is installed. Attached to structure 2. The second hollow support 8 is provided with a diameter larger than that of the first and third hollow support 7 and 9 above and below, and has a hydraulic cylinder as an example of a hydraulic cylinder for vertically moving the lower coil 1c. A pair of coils 10 are installed on both sides of the upper and lower coils. The actuating rod 11 of the piston 10a, which is moved up and down by the hydraulic cylinder 10, passes through the inside of the third hollow support 9.
It protrudes downward, and further upper coil 1
It penetrates through holes 32 and 33 formed in both arm parts 1a' and 1b' of arms a and 1b and both arm parts 1c' of lower coil 1c, respectively, and projects downward. Both arms 1
The lower ends of c' and 1c' are supported by a support 34 fitted to the actuating rod 11. 35 is a nut screwed onto the threaded portion at the tip of the actuating rod 11 to support the support member 34 from below, and 36 is a lock nut.

Note that if the lower sides of both arm parts 1c' and 11c' are only supported by the supports 34, there is a risk that the lower coil 1c will be lifted upward when the actuating rod 11 is lowered. Letter-shaped presser metal fitting 3
7 is provided, and its upper bent portion 37a presses down the upper surface portions of both arm portions 1c'. The lower bent portion 37b of the presser fitting 37 has a hole formed therein, through which the threaded end of the actuating rod 11 is inserted, and the nut 4 is inserted from below.
4 is tightened and supported. Upper coil 1a, 1
Both arm portions 1a' and 1b' of b are attached to the lower end of the third hollow support 11. 38 is a hydraulic pipe, the tip of which passes through a hole 42 formed in the second hollow support 8 and is connected to the hydraulic cylinder 10.

Therefore, by operating the hydraulic cylinder 10, the actuating rod 11 can be moved up and down, and the lower coil 1c can be moved up and down accordingly.
In FIG. 1, a solid line indicates a state in which the upper coils 1a, 1b and the lower coil 1c are closed so that current can flow therethrough, and a broken line indicates an open state.

In the above embodiment, making each of the first, second, and third pillars 7, 8, and 9 hollow, and storing each operating member therein helps to downsize the device, and
Furthermore, the second and third hollow supports 8 and 9 also serve as an electromagnetic shielding case. Therefore, equipment such as the hydraulic cylinder 10 installed inside the second and third hollow columns 8 and 9 is not affected by the electromagnetic force caused by the high-frequency current flowing through the upper and lower coils 1a, 1b, and 1c. . However, the hydraulic cylinder 10 and the actuating rod 11 for opening and closing the lower coil 1c do not necessarily have to be installed inside the hollow supports 8 and 9, but can be installed using ordinary non-hollow supports. Good too. In that case, the hydraulic cylinder 10 and the actuating rod 11 may be electromagnetically shielded by another means using a shielding member.

In the embodiment, an operating rod 45 is inserted into the first hollow support 7, and its lower end is connected to the upper end of the operating rod 11. Although not shown in the figure, if a limit switch or the like is provided above that is activated by the vertical movement of the operating rod 45, the heating coil 1 Various devices can be operated in conjunction with each other, such as automatically turning the power on and off. In the figure, 46 is a bolt that connects the upper end of the second hollow support 8 and the lower end of the first hollow support 7, and 40 is a bolt that connects the lower end of the second hollow support 8 and the upper end of the third hollow support 9.

Cooling water passage holes 13 and 15 are provided inside the upper coils 1a, 1b and lower coil 1c of the heating coil 1, respectively. Arm part 1
a′, 1b′, and 1c′ are configured to communicate at a communicating portion 14 provided on the contact surface, and each upper and lower coil 1
When a, 1b, 1c are closed, water holes 13 and 14
communicate. The cooling water passes through a pipe connected to a water source (not shown), enters the water supply hole 13 in the upper coil 1a from the water supply hole 12, passes through the communication hole 14, enters the lower coil 1c, and then continues to the opposite side. Water is drained from the communication hole through the drainage hole 16 through the water passage hole in the upper coil 1b.

Next, on the left and right outer sides of the heating coil 1, both arm parts 1a', 1b', 1 of the upper and lower coils 1a, 1b, 1c are arranged.
A fountain nozzle 18 is provided toward each contact surface 1d of c'. Reference numeral 17 indicates a water supply hole thereof, and reference numeral 41 indicates a supporting arm of the fountain nozzle 18. The supporting arm 41 is attached to, for example, the third hollow support 9. This fountain nozzle 18
When the upper and lower coils 1a, 1b, 1c are once opened and the heated materials 20, 23 are passed inside and closed again, both arm portions 1a', 1c of the upper and lower coils 1a, 1b, 1c are opened.
By jetting water toward the contact surface 1d of the contact surfaces 1b' and 1c', foreign matter such as oxide scale, which is present on the contact surface 1d, generated by heating the heated material is washed away and cleaned. Poor contact on the surface 1d can be eliminated. Note that what is sprayed onto the contact surface 1d is not limited to water; compressed air may also be used, and the contact surface 1d can also be cleaned with this.

Next, the operation of vertically opening and closing the divided heating coil 1 and the sequence of operations of spouting water from the fountain nozzle 18 will be explained.

To open the upper and lower coils 1a, 1b, and 1c when they are closed, first close the water supply valve (not shown) to stop the water supply to the water holes 13 and 15 of the heating coil 1. Next, the hydraulic cylinder 10 is activated to move the lower coil 1c downward to open the coil section. After that, the upper and lower coils 1a, 1
When closing b and 1c, first close the fountain nozzle 1.
Water is jetted from 8 toward the contact surfaces 1d of the upper and lower coils to wash away foreign matter on the contact surfaces, while operating the hydraulic cylinder 10 to move the actuating rod 11 upwards, thereby removing the upper and lower coils. 1
Close a, 1b, 1c. Then, fountain nozzle 1
The water injection from 8 is stopped, and the upper and lower coils 1a,
Cooling water is passed through the water passage holes 13 and 15 of 1b and 1c. The heating coil 1 is now in a state where it can be energized, and the material to be heated can be heated by induction with high-medium frequency current.

In this embodiment, a hydraulic cylinder 10 with an output of 3 tons is used to connect the upper and lower coils 1a, 1.
b and 1c were tightened and fixed in the closed state, and the current value when energized was approximately 7000A. the result,
The opening and closing operations of the upper and lower coils 1a, 1b, and 1c were carried out smoothly, the contact state of the contact surface 1d was good, and the current flow between them was good.

H. Effects of the invention According to the contact surface cleaning device for split induction heating coils according to the present invention, when the split coils are closed, the contact surfaces of the upper and lower coils are cleaned by jetting fluid such as water, so that The contact surface can be cleaned automatically and reliably, thereby eliminating the risk of foreign objects being caught on the contact surface, resulting in poor energization and damage to the heating coil.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of an induction heating device that implements the cleaning device of the present invention, Figures 2A and B are front and side views of the entire heating device, and Figure 3 is a continuous Fig. 4 is a plan view showing an overview of the process of manufacturing a pipe from a strip plate, Fig. 4 is a plan view showing the state when the plate is passed through, and Fig. 5 is an explanatory diagram of the state in which the stepped shaft is surface hardened using a heating coil. , Figure 6 is Figure 3A-
It is an A′ cross-sectional view. 1... Heating coil, 1a, 1b... Upper coil, 1c... Lower coil, 1d... Contact surface, 18
...Injection nozzle.

Claims (1)

[Claims for Utility Model Registration] (1) In an induction heating coil in which a coil portion is divided into a plurality of parts, and a material to be heated is inserted into the inside of the divided coil by opening and closing the divided coil, A contact surface cleaning device for a split induction heating coil, characterized in that a fluid jet nozzle is disposed toward the contact surface of the coil. (2) The contact surface cleaning device for a split induction heating coil according to claim 1, wherein the fluid jetted from the jet nozzle is water.