WO2020103452A1 - Electromagnetic induction heating device for surfacing and preheating rotor surface of internal mixer - Google Patents

Abstract

An electromagnetic induction heating device for surfacing and preheating a rotor surface of an internal mixer, comprising a rotor to be welded (1). A plurality of electromagnetic induction heating devices (3) are installed at an inner part of the rotor to be welded by means of support legs (2), and the electromagnetic induction heating devices are distributed annularly at equal intervals at the inner part the rotor to be welded. Two ends of an electromagnetic induction heating device are respectively mounted with a left claw disk (5) and a right claw disk (6) by means of claws (4), and a protective pipeline (7) is axially arranged in the middle of the right claw disk. The electromagnetic induction heating device has a fast heating speed, high efficiency, an extremely low metal burning rate, and a low heating cost, and employs closed-loop control. The induction heating may perform real-time and accurate automatic control according to a current state of a workpiece being heated.

Description

[Name of invention formulated by ISA according to Rule 37.2] An electromagnetic induction heating device for surfacing preheating of the surface of the mixer rotor Technical field

The invention relates to the field of internal mixer, in particular to an electromagnetic induction heating device for surfacing welding preheating on the surface of internal mixer rotor.

Background technique

The rotor is one of the main working parts of the mixer. During the working process, the friction between the rotor and the rubber is serious, so it has high requirements on the wear resistance of the rotor. In order to improve the life of the rotor, a certain thickness of wear-resistant layer should be welded on the edge and edge of the rotor, and then machined. At the same time, in order to improve the bonding strength of the wear-resistant layer and the substrate and reduce surface cracks, a layer of transition layer must be welded between the substrate and the wear-resistant layer. The surfacing welding process on the rotor surface requires preheating of the rotor before surfacing, heating in the welding process, and overall heat treatment after welding.

Electromagnetic induction heating comes from the electromagnetic induction phenomenon discovered by Faraday. First, the alternating current generated by the induction heating power source generates an alternating magnetic field through an inductor (ie, a coil), and a magnetically conductive object is placed therein to cut the alternating magnetic field lines, thereby generating an alternating current (ie, eddy current) inside the object. Due to the resistance of the conductor, the resistance heat (Joule heat) generated when the eddy current flows through the conductor. For ferromagnetic workpieces, there is also a hysteresis thermal effect, which will also increase the temperature of the workpiece. Therefore, electromagnetic induction heating is a heating method that converts electrical energy into magnetic energy, magnetic energy into electrical energy, and electrical energy into thermal energy, thereby heating the heated workpiece. At present, the rotor of the internal mixer is heated by a heating furnace during surfacing welding.This heating method has the following defects:

(1) The heating and surfacing process cannot be performed simultaneously;

(2) The rotor is always cooling during surfacing, and the quality of the surfacing is uneven;

(3) A huge heating furnace is required, and the heating process is slow;

(4) Low heating efficiency.

Summary of the invention

In order to overcome the shortcomings of the existing technical solutions, the present invention provides an electromagnetic induction heating device for surfacing welding preheating on the rotor surface of an internal mixer, which can effectively solve the problems raised by the background technology.

The technical solutions adopted by the present invention to solve its technical problems are:

An electromagnetic induction heating device for surfacing preheating of the rotor surface of an internal mixer includes a rotor to be welded, an electromagnetic induction heating device is installed inside the rotor to be welded through legs, and the electromagnetic induction heating devices are distributed in a ring at equal intervals Inside the welding rotor, the two ends of the electromagnetic induction heating device are respectively installed with a left claw disk and a right claw disk through clamping claws, and a protection pipe is arranged axially in the middle of the right claw disk.

Further, the electromagnetic induction heating device is connected to a hydroelectric slip ring provided in a protection pipe, the electromagnetic induction device includes a heat exchange shell, a plurality of electromagnetic rod bodies are arranged inside the heat exchange shell, and the electromagnetic rod bodies A heat transfer prism is arranged on the heat transfer fin, and the heat transfer prism is attached to the inner surface of the heat exchange shell, and the electromagnetic rod body and the heat transfer prism are arranged with equidistant rotation holes at the joints, and the electromagnetic rod The body is wound with a copper wire through a rotation hole, and a core rod is arranged in the middle of the electromagnetic rod body.

Further, the clamping claws are installed on the left and right claw disks through bolt sleeves, a quadrangular screw rod is sleeved in the middle of the spiral sleeve, and a rigid spring is sleeved on the rod body of the bottom four-corner screw rod of the bolt sleeve, and The jaws extend into the inner end surfaces of the left and right claw disks are provided with screw teeth, the left and right claw disks are embedded with a dial ring, and the protruding portion of the dial ring is provided with an inward ring tooth , And the dial ring spirally engages the screw teeth.

Further, two heat exchange jackets are wound on the heat transfer fins, and the fluid flow inside the two heat exchange jackets is opposite, and a vacuum layer is provided between the heat exchange jackets and the heat transfer fins .

Further, an oil pressure fixing device is provided on the left and right claw plates, the oil pressure fixing device includes an annular oil passage and a torsion hole provided on the side wall of the left and right claw plates, the torsion force A piston rod is arranged in the hole, and a plurality of pressure groove holes are arranged on the annular oil path, and a pressure rod is arranged in the pressure groove hole.

Further, the tops of the heat exchange jackets wound on several heat transfer cold plates are connected together to form an outlet pipe and an inlet pipe, and two inlet pipes and an outlet pipe are provided on the same heat exchange shell, and the hydroelectric slip ring The waterway pipeline and circuit pipeline in the are connected to the water inlet pipe and the copper wire respectively.

Further, a heat insulation felt pad is provided on one side of the left and right claw discs relative to the rotor to be welded.

Further, the number of the heat exchange shells is at least two, and a temperature sensor is provided between adjacent heat exchange shells, the temperature sensor includes a contact temperature sensor and a measurement that are attached to the inner wall of the rotor to be welded Infrared sensor for internal space temperature.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The heating speed is fast and the efficiency is high. The efficiency of induction heating is 60% higher than that of flame and 45% higher than that of resistance heating. The heating speed should be 2-3 times that of resistance heating, and the metal burning rate is extremely low.

(2) The heating cost is low. Due to the high efficiency and speed, it has a high cost advantage under long-term use in large quantities.

(3) It is easy to realize automatic control. It adopts closed-loop control. Induction heating can perform real-time accurate automatic control according to the current state of the heated workpiece, which fully meets the requirements of the heating process.

(4) Environmentally friendly, induction heating does not generate any exhaust gas and smoke, radiation leakage is small, noise is low, the working environment and the working conditions of the operator can be improved.

(5) The operation is simple, safe and reliable. The inverter induction heating power supply presets a variety of operation modes. It is simple to open and close, save energy and time, eliminate open flames, and improve safety.

(6) The heating process has high adaptability, which can be used for both overall heating and local heating. After replacing the inductor, the power supply can match a variety of heating processes.

BRIEF DESCRIPTION

1 is a schematic diagram of the overall structure of the present invention;

2 is a schematic diagram of the cross-sectional structure of the electromagnetic induction heating device of the present invention;

3 is a schematic diagram of the structure of the electromagnetic rod body of the present invention;

4 is a schematic diagram of the enlarged structure of the annular oil circuit of the present invention;

5 is a schematic view of the right claw disc structure of the present invention;

6 is a schematic view of the bolt sleeve structure of the present invention.

Numbers in the figure:

1- Rotor to be welded; 2- Leg; 3- Electromagnetic induction heating device; 4- Claw; 5- Left claw disk; 6- Right claw disk; 7- Protection pipeline; 8- Hydroelectric slip ring; 9- Bolt sleeve; 10-square screw rod; 11- rigid spring; 12- dial ring; 13- inward ring teeth; 14- heat exchange jacket; 15- vacuum layer; 16- hydraulic fixing device; 17- heat insulation felt pad; 18- Temperature Sensor;

301-heat exchange shell; 302-electromagnetic rod body; 303-heat transfer prism; 304-rotation hole; 305-copper wire; 306-core rod;

1601-circular oil passage; 1602-torque hole; 1603-pressure slot; 1604-plug.

detailed description

The technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

As shown in FIGS. 1 to 6, the present invention provides an electromagnetic induction heating device for surfacing preheating of the rotor surface of an internal mixer, which includes a rotor 1 to be welded, and a number of electromagnetic induction heaters are installed inside the rotor 1 to be welded via legs 2 Device 3, and the electromagnetic induction heating device 3 is distributed in the rotor 1 to be welded in a ring shape at equal intervals. The two ends of the electromagnetic induction heating device 3 are respectively installed with a left claw disk 5 and a right claw disk 6 through the claws 4, the middle of the right claw disk 6 Axial protection pipe 7 is provided.

The working principle of the present invention is: when working, the electromagnetic induction heating device is first installed in the rotor to be welded through the feet, and then the rotor to be welded equipped with the electromagnetic induction heating device is hoisted to the rotor processing positioner of the mixer, from left to right The claw is fixed to the rotor to be processed in the center; then the heating power is turned on, and the rotor to be welded is electromagnetically heated by the electromagnetic induction heating device;

When the outer surface of the rotor reaches the required temperature, the heating power is switched to a constant temperature mode to maintain the temperature of the rotor to be welded. At this time, the positioner starts to rotate, and the welding robot starts the surfacing operation of the mixer rotor;

Finally, after the surfacing of the rotor of the internal mixer is completed, the rotor that has completed the surfacing is hoisted and unloaded into the furnace for heat treatment, and the next rotor to be processed is replaced for heating and welding.

The electromagnetic induction heating device 3 in the present invention is connected to the hydroelectric slip ring 8 provided in the protection pipe 7. The electromagnetic induction device 3 includes a heat exchange shell 301, and a number of electromagnetic rod bodies 302 are arranged inside the heat exchange shell 301. 302 is provided with a heat transfer prism 303, and the heat transfer prism 303 is attached to the inner surface of the heat exchange housing 301, and the connecting holes of the electromagnetic rod body 302 and the heat transfer prism 303 are arranged at equal intervals with the rotation holes 304, electromagnetic The rod body 302 is wound with a copper wire 305 through the rotation hole 304, and a core rod 306 is provided in the middle of the electromagnetic rod body 305;

The electromagnetic induction heating device 3 connects the circuit and the water circuit through the hydroelectric slip ring 8. During operation, an induced magnetic field is generated when the copper wire 305 is energized, and an induced current is generated in the core rod 306 at the same frequency but in the opposite direction of the copper wire 305. Through the winding of the rotation hole 304, the core rod 306 can quickly generate heat. At the same time, because the material of the core rod 306 and the electromagnetic rod body 302 are different, the form of the core rod 306 wrapped by the electromagnetic rod body 302 makes the interior of the core rod 306 in More magnetic effects are obtained per unit time, so that the core rod 306 generates heat rapidly. During the heat generation, heat is transferred to the heat transfer fins 303, and the heat transfer cold plates 303 are in contact with the surface of the heat exchange shell 301. Therefore, the heat exchange shell 301 can quickly conduct the heat energy of the core rod 306, thereby accelerating the preheating process of the rotor 1 to be welded, and solving the problems of slow heat transfer speed and long heating time of the traditional electromagnetic rod heating.

The claw 4 in the present invention is mounted on the left claw disk 5 and the right claw disk 6 through the bolt sleeve 9, the middle of the spiral sleeve 9 is provided with a four-corner screw rod 10, and the bottom of the four-angle screw rod 10 on the bottom of the bolt sleeve 9 is provided with a rigid Spring 11, and the claw 4 extends into the inner end surface of the left claw disk 5 and the right claw disk 6 is provided with screw teeth, the left claw disk 5 and the right claw disk 6 are embedded with a dial ring 12, the protruding portion of the dial ring 12 The inward ring teeth 13 are provided, and the dial ring 12 spirally engages the teeth.

It is further explained that the bottom body of the four-corner screw rod 10 at the bottom of the rigid spring 11 of the present invention is provided with a bottom washer, and the bottom washer is movably installed on the claw 4 by a bracket, so that the four-corner screw rod 10 and the spiral sleeve 9 Form a fixed adjustment assembly with the rigid spring 11;

During the installation of the rotor to be welded, the electromagnetic induction heating device 3 can be installed on the left claw disc 5 through the claw 4 first, and then the rotor 1 to be welded can be sleeved, and the position of the rotor 2 can be further fixed by the foot 2 When the right claw plate 6 is connected, the hydroelectric slip ring 8 and the electromagnetic induction heating device 3 are electrically connected. The connection method may be a plug-in type or an electrical connector connection. At the same time, the hydroelectric slip ring 8 is provided in the protection pipe 7, Moreover, the protective pipe 7 is located in the right claw disc 6 to avoid excessive close contact with the electromagnetic induction heating device 3 and ensure the safety of the connection.

The claw 4 in the present invention is installed and fixed on the left claw disk 5 and the right claw disk 6 by the four-corner screw rod 10, and after the electromagnetic induction heating device 3 is fixed with the left claw disk 5, the repeated disassembly can be avoided When the magnetic induction device 3 and the right claw plate 6 are fixed, the fixed position of the claw 4 can be further adjusted by rotating the four-angle screw rod 10, and the centripetal adjustment method simultaneously changes the annular diameter of several electromagnetic induction heating devices 3 , So that it can adapt to different inner diameters of the rotor 1 to be welded with the same specification, and when the next rotor 1 to be welded is installed, only the four-corner screw rod 10 needs to be turned to realize the quick release of the right claw disc 5 and the claw 4, improving The efficiency of surfacing.

Two heat exchange jackets 14 are wound around the heat transfer fins 303, and the fluid flow inside the two heat exchange jackets 14 is opposite, and a vacuum layer 15 is provided between the heat exchange jacket 14 and the heat transfer ribs 303.

The left claw disc 5 and the right claw disc 6 are provided with a hydraulic fixing device 16, which includes an annular oil passage 1601 and a torsion hole 1602 provided on the side wall of the left claw disc 5 and the right claw disc 6, a torsion hole A piston rod 1603 is provided in 1602, a plurality of pressure grooves 1603 are provided in the annular oil passage 1601, and a plunger 1604 is provided in the pressure groove 1603.

In the present invention, the installation and locking of the claw 4 and the left claw disk 5 and the right claw disk 6 are performed by the oil pressure fixing device 16, and the oil pressure in the annular oil passage 1601 is changed by turning the piston rod 1603 in the torque hole 1602 so that The jack 1504 on the side wall of the welding rotor 1 is ejected from the pressure slot 1603, thereby completing the locking of the rotor 1 to be welded;

It is further explained that the fluid used in the annular oil passage 1601 of the present invention is a high-temperature resistant liquid such as methyl silicon liquid, which has a high boiling point.

The tops of the heat exchange jackets 14 wound on several heat transfer cold plates 303 are connected together to form an outlet pipe and an inlet pipe. Two inlet pipes and an outlet pipe are provided on the same heat exchange housing 301, and the hydroelectric slip ring 8 The waterway pipe and circuit pipeline in the are connected to the water inlet pipe and the copper wire 305 respectively.

The left claw disk 5 and the right claw disk 6 are provided with heat insulation felt pads 17 on one side of the rotor 1 to be welded.

The number of heat exchange shells 301 is at least two, and a temperature sensor 18 is provided between adjacent heat exchange shells 301. The temperature sensor 18 includes a contact temperature sensor attached to the inner wall of the rotor to be welded and measures the temperature of the internal space Infrared sensor.

A contact temperature sensor performs real-time temperature detection on the contact surface of the rotor to be welded, and an infrared sensor monitors the temperature inside the electromagnetic induction heating device, so that the rotor 1 to be welded is controlled in real time.

It is further explained that the electromagnetic induction heating device in the present invention can also be installed on the left claw disk 5 and the right claw disk 6 using traditional electromagnetic induction heating rods, and is installed through the feet 2, which can also realize the electromagnetic of the rotor 1 to be welded heating.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present invention is defined by the appended claims rather than the above description, and is therefore intended to fall within the claims All changes within the meaning and scope of the equivalent requirements are included in the present invention. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims (8)

1. An electromagnetic induction heating device for surfacing preheating of the surface of an internal mixer rotor includes a rotor (1) to be welded, characterized in that an electromagnetic induction heating device ( 3), and the electromagnetic induction heating device (3) is distributed in a ring shape at equal intervals inside the rotor (1) to be welded, and both ends of the electromagnetic induction heating device (3) are respectively installed with left claw discs through the claws (4) (5) and the right claw disc (6), and a protection pipe (7) is arranged axially in the middle of the right claw disc (6).
2. An electromagnetic induction heating device for surfacing welding preheating on the surface of an internal mixer rotor according to claim 1, characterized in that the electromagnetic induction heating device (3) is connected to a hydroelectric slip ring arranged in a protective pipe (7) (8), the electromagnetic induction device (3) includes a heat exchange housing (301), a plurality of electromagnetic bar bodies (302) are arranged inside the heat exchange housing (301), and the electromagnetic bar body (302) A heat transfer prism (303) is provided, and the heat transfer prism (303) is attached to the inner surface of the heat exchange shell (301), the electromagnetic rod body (302) and the heat transfer prism (303) Rotation holes (304) are arranged at equal intervals at the connection, the electromagnetic rod body (302) is wound with copper wire (305) through the rotation holes (304), and a core rod is arranged in the middle of the electromagnetic rod body (305) (306).
3. The electromagnetic induction heating device for surfacing preheating of the surface of the mixer rotor according to claim 1, characterized in that the clamping claw (4) is installed on the left claw disc (5) through a bolt sleeve (9) and On the right claw disc (6), a quadrangular screw rod (10) is set in the middle of the spiral sleeve (9), and a rigid spring (11) is sheathed on the rod body of the bottom square screw rod (10) of the bolt sleeve (9) , And the claw (4) extends into the inner end surface of the left claw disk (5) and the right claw disk (6) is provided with screw teeth, the left claw disk (5) and the right claw disk (6) are embedded A dial ring (12) is installed, the protruding portion of the dial ring (12) is provided with an inward ring tooth (13), and the dial ring (12) spirally engages the screw tooth.
4. An electromagnetic induction heating device for surfacing welding preheating on the surface of an internal mixer rotor according to claim 2, characterized in that the heat transfer prism (303) is wound with two heat exchange jackets (14), In addition, the fluid flow inside the heat exchange jacket (14) is reversed in two turns, and a vacuum layer (15) is provided between the heat exchange jacket (14) and the heat transfer fin (303).
5. The electromagnetic induction heating device for surfacing welding preheating of the rotor surface of an internal mixer according to claim 1, characterized in that: the left claw disc (5) and the right claw disc (6) are provided with hydraulic fixing devices (16), the oil pressure fixing device (16) includes an annular oil passage (1601) and a torsion hole (1602) provided on the side wall of the left claw disk (5) and the right claw disk (6), the torsion hole A piston rod (1603) is provided in (1602), and a plurality of pressure grooves (1603) are provided on the annular oil passage (1601), and an ejector rod (1604) is provided in the pressure grooves (1603) .
6. The electromagnetic induction heating device for surfacing welding preheating on the rotor surface of an internal mixer according to claim 2, characterized in that: the top ends of the heat exchange jackets (14) wound on several heat transfer cold plates (303) are connected They form an outlet pipe and an inlet pipe together. Two inlet pipes and outlet pipes are provided on the same heat exchange housing (301). The water pipe and circuit pipeline in the hydroelectric slip ring (8) are connected to the inlet pipe and Copper wire (305).
7. An electromagnetic induction heating device for surfacing welding preheating on the surface of an internal mixer rotor according to claim 1, characterized in that the left claw disk (5) and the right claw disk (6) are relative to the rotor (1) to be welded ) Is provided with a heat insulation felt pad (17) on one side.
8. The electromagnetic induction heating device for surfacing preheating of the surface of the mixer rotor according to claim 2, wherein the number of the heat exchange shells (301) is at least two, and the adjacent heat exchange shells A temperature sensor (18) is provided between the bodies (301). The temperature sensor (18) includes a contact temperature sensor attached to the inner wall of the rotor to be welded and an infrared sensor that measures the temperature of the internal space.

Images