Coreless induction furnace

Abstract

The application discloses a coreless induction furnace and belongs to the technical field of induction smelting equipment. The coreless induction furnace comprises a furnace body, a furnace cover, a hopper and a driving control assembly. The furnace body is provided with a driving motor on one side, the output end of the driving motor is connected with an installation shaft through a gear, and the top of the installation shaft is fixedly connected with a support plate. The support plate is provided with a first electric cylinder and a second electric cylinder at two ends respectively, the first electric cylinder is connected with the furnace cover, and the second electric cylinder is connected with the hopper. The bottom of the hopper is provided with an elastic locking mechanism composed of a fixing rod, a connecting block, a plug rod, a movable block and a first compression spring, so that the automatic opening and closing of a sealing plate are realized. The support plate and the installation shaft are connected through an installation plate structure provided with a ball and a universal ball, so that the rotation is stable. The coreless induction furnace realizes the automatic collaborative operation of the opening and closing of the furnace cover and the feeding of the hopper, the automatic unlocking and feeding are completed through the linkage of the hopper descending trigger mechanism, the feeding efficiency, the operation safety and the process consistency are remarkably improved, and the coreless induction furnace has the advantages of compact structure, stable operation and convenient maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coreless induction furnace, and particularly relates to a coreless induction furnace. BACKGROUND

[0002] The coreless induction furnace has become an indispensable smelting equipment in modern casting and metallurgical industry due to its high heating efficiency, uniform smelting temperature, precise composition control and small environmental pollution. The basic working principle is that the induction coil is connected to the intermediate frequency or power frequency alternating current to generate an alternating magnetic field, so that the metal charge in the furnace generates eddy current to realize electric heating conversion and complete the smelting and heat preservation process.

[0003] At present, the traditional coreless induction furnace needs to frequently add alloy elements, deoxidizers or inoculants to the molten pool to adjust the composition of the metal liquid during the actual production process, especially during the refining stage. The existing feeding mode mainly relies on fixed simple hoppers, ground mobile feeding cars or industrial robots for material conveying. However, these methods have the following obvious defects:

[0004] 1. Poor operation coordination: the feeding device and the opening and closing action of the furnace cover are independent of each other, and the furnace cover needs to be manually or by additional equipment removed before each feeding, and then closed again after feeding is completed, which is time-consuming and laborious, and affects the production rhythm.

[0005] 2. Low automation level: the opening and closing of the hopper discharge port mainly rely on manual operation or simple mechanical control, and it is difficult to realize the linkage control with the furnace positioning and the movement of the furnace cover, which increases the labor intensity and operation risk of the operators.

[0006] 3. Unreasonable structure layout: the furnace cover and the feeding device are separately arranged, which occupies a large space, and is easy to interfere in frequent moving operation, affecting the stability and safety of the equipment operation.

[0007] 4. It is difficult to guarantee the feeding precision and consistency: due to the multiple manual intervention links, the feeding time, position and quantity control are easily affected by human factors, which is not conducive to the standardization and fine control of the smelting process.

[0008] Therefore, there is an urgent need for a coreless induction furnace which can realize the automatic linkage of the opening and closing of the furnace cover and the feeding action, has compact structure and convenient operation, so as to improve the automation level, operation efficiency and process consistency of the feeding process, and meet the increasing demand of modern metallurgical industry for efficient, precise and intelligent production. SUMMARY

[0009] The purpose of the present application is to solve the problems in the prior art and provide a coreless induction furnace.

[0010] In order to achieve the above object, the technical scheme adopted by the present application is as follows: a coreless induction furnace, comprising a furnace body and a furnace cover, an opening is formed in the top of the furnace body, a drive motor is arranged on one side of the furnace body, the output end of the drive motor is connected with a support plate, the support plate is located above the furnace cover, the two ends of the support plate are respectively provided with a first electric cylinder and a second electric cylinder, the output end of the first electric cylinder is arranged on the top of the furnace cover, the output end of the second electric cylinder is connected with a hopper, a discharge port is formed in the bottom of the hopper, and an obturator plate is connected with the discharge port through an elastic locking mechanism.

[0011] Preferably, the elastic locking mechanism comprises two guide rods, the two guide rods are arranged on the two sides of the obturator plate, the surfaces of the two guide rods are slidably sleeved with a plurality of connecting blocks, one end of the plurality of connecting blocks is arranged on the side surface of the obturator plate, one end of the two guide rods is connected with a first compression spring, and one end of the two first compression springs is arranged on the surface of two connecting blocks.

[0012] Preferably, one end of the two guide rods is provided with a fixing piece, the fixing piece is in a bent shape, and the other end of the fixing piece is arranged outside the hopper.

[0013] Preferably, the surfaces of the two guide rods are movably sleeved with a movable block, a communication insertion hole is formed between the top of the movable block and the surface of the guide rod, a insertion rod is inserted between the two insertion holes, the top end of the insertion rod is provided with a connecting plate, a fixed block corresponding in position is arranged below the connecting plate, the bottom end of the fixed block is arranged above the furnace body, and the connecting plate and the hopper are connected through a pre-tightening mechanism.

[0014] Preferably, an induction coil is wound in the inner wall of the furnace body, a working furnace lining is arranged in the furnace body, coil mastic is filled between the inside of the furnace body and the outside of the working furnace lining, an upper structure prefabricated part and a lower structure prefabricated part are arranged on the top and the bottom of the furnace body respectively, a gas diffuser is arranged through the bottom of the furnace body, a sealing piece is arranged on the top of the working furnace lining, the bottom of the furnace cover is arranged on the top of the sealing piece, and the bottom end of the fixed block is arranged on the top of the upper structure prefabricated part.

[0015] Preferably, the gas inlet of the gas diffuser is connected with a gas pipe, one end of the gas pipe penetrates through the lower structure prefabricated part and is connected with an external gas source.

[0016] Preferably, the pre-tightening mechanism comprises a telescopic rod, the surfaces of the telescopic rod are sleeved with a second compression spring, and the two ends of the telescopic rod and the second compression spring are arranged on the surfaces of the connecting plate and the hopper.

[0017] Preferably, the lower part of the furnace body is provided with a base, the driving motor is installed on the top of the base, the top of the base is provided with an installation shaft through a bearing support, the top end of the installation shaft is installed on the bottom of the support plate, and the output end of the driving motor and the surface of the installation shaft are both provided with mutually meshing gears.

[0018] Preferably, the bottom of the support plate and the surface of the installation shaft are both provided with coaxially arranged installation plates, the periphery of each of the installation plates is surrounded by more than three fixing rods, one end of each of the fixing rods is installed on the side of the upper installation plate, the bottom end of each of the fixing rods is bent and extends to below the lower installation plate, and the bent bottom end of each of the fixing rods is provided with a universal ball bearing, and the arc surface of the universal ball bearing is in contact with the bottom of the lower installation plate.

[0019] Preferably, the surface of each of the installation plates is provided with a ball bearing groove, and a plurality of ball bearings are arranged between the two ball bearing grooves.

[0020] Compared with the prior art, the present application has the following significant advantages, effectively solving the key problems of poor coordination, low automation level and complicated operation in the traditional coreless induction furnace feeding process.

[0021] 1. Realize the automatic and coordinated operation of the furnace cover and the feeding device. By integrating the furnace cover and the hopper on the same support plate and driving the whole to rotate by the driving motor, the automatic switching of the furnace cover opening and closing and the feeding station is realized. No manual intervention is needed for the furnace cover during feeding, which significantly improves the continuity and production rhythm of the operation and solves the problem of process separation and poor coordination in the traditional way.

[0022] 2. Fully automatic opening and closing of the material and precise feeding. Through the cooperation of the elastic locking mechanism and the pre-tightening mechanism, when the hopper is lowered to the furnace opening, a series of actions such as automatic triggering of the insertion rod removal, sliding of the sealing plate and pouring of the material can be automatically triggered, completing the fully automatic opening and closing of the material and the feeding process. This design replaces the traditional manual or simple mechanical operation, improves the automation level and feeding accuracy of the feeding, and ensures the process consistency.

[0023] 3. Compact structure and stable operation. The support plate and the installation plate adopt a bearing structure composed of ball bearings and universal ball bearings, which not only ensures the stability and concentricity of the rotary motion, but also effectively bears the overturning moment and radial load. The overall structural layout is reasonable, which reduces the equipment occupation space, avoids motion interference, and improves the safety and reliability of the equipment operation.

[0024] 4. Improve production efficiency and operation safety. The whole feeding process is uniformly coordinated and controlled by the PLC controller, realizing the full-process automation of the furnace cover moving away, hopper positioning, lowering and opening the material, feeding, resetting and closing the furnace cover. This design greatly reduces the manual operation links, reduces the labor intensity and operation risk, and improves the production efficiency and system repeatability.

[0025] 5. Strong adaptability and easy to maintain. The hopper is made of heat-resistant stainless steel, the structure is firm, and is suitable for various alloy additives and smelting environment. The mechanism design is simple and reliable, the function modules are relatively independent, the daily inspection, maintenance and part replacement are facilitated, and good practicality and engineering applicability are obtained.

[0026] In summary, the application realizes the automation and integration operation of the feeding process of the coreless induction furnace through structural innovation and mechanism linkage design, has outstanding practical value and creativity in aspects of improving production efficiency, guaranteeing process quality and reducing labor cost, etc. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structure schematic view of the connection of the furnace cover and the furnace body of the application;

[0028] Figure 2 It is a structure schematic view of the feeding state of the furnace body of the application;

[0029] Figure 3 It is a connection structure schematic view of the mounting plate and the ball of the application;

[0030] Figure 4 It is a connection structure schematic view of the fixed rod and the universal ball of the application;

[0031] Figure 5 It is a connection structure schematic view of the second electric cylinder, the hopper and the sealing plate of the application;

[0032] Figure 6 It is a connection structure schematic view of the plug rod and the fixed rod of the application;

[0033] Figure 7 It is a connection structure schematic view of the second compression spring and the telescopic rod of the application;

[0034] Figure 8 It is an internal structure schematic view of the coreless induction furnace body of the application.

[0035] In the figure: 1, mounting shaft; 2, drive motor; 3, gear; 4, furnace cover; 5, mounting plate; 6, first electric cylinder; 7, support plate; 8, second electric cylinder; 9, hopper; 10, fixing piece; 11, fixed block; 12, furnace body; 13, base; 14, fixed rod; 15, first compression spring; 16, ball groove; 17, ball; 18, universal ball; 19, connecting rod; 20, guide rod; 21, connecting block; 22, movable block; 23, second compression spring; 24, connecting plate; 25, plug rod; 26, telescopic rod; 27, sealing piece; 28, upper structure prefabricated part; 29, coil cement; 30, lower structure prefabricated part; 31, working furnace lining; 32, gas diffuser; 33, induction coil; 34, blocking plate. DETAILED DESCRIPTION

[0036] The following description is used to disclose the present application so that those skilled in the art can implement the present application. The preferred embodiments in the following description are only as examples, and other obvious modifications can be thought of by those skilled in the art.

[0037] As Figures 1-8 shown in a coreless induction furnace, comprising a furnace body 12 and a furnace cover 4, the top of the furnace body 12 is provided with an opening, one side of the furnace body 12 is provided with a drive motor 2, the output end of the drive motor 2 is connected with a support plate 7, the support plate 7 is located above the furnace cover 4, both ends of the support plate 7 are respectively provided with a first electric cylinder 6 and a second electric cylinder 8, the output end of the first electric cylinder 6 is mounted on the top of the furnace cover 4, the output end of the second electric cylinder 8 is connected with a hopper 9, the bottom of the hopper 9 is provided with a discharge port, the discharge port is connected with a blocking plate 34 through an elastic locking mechanism.

[0038] The inside of the hopper 9 is provided with a cross-shaped connecting rod 19, the middle part of the connecting rod 19 is connected with the output end of the second electric cylinder 8, the hopper 9 is made of heat-resistant stainless steel (such as 310S stainless steel), and the volume can be designed as 20-50L according to the commonly used additive amount. The blocking plate 34 is also made of heat-resistant stainless steel.

[0039] The elastic locking mechanism comprises two guide rods 20, the two guide rods 20 are distributed on both sides of the blocking plate 34, the surfaces of the two guide rods 20 are respectively slidably sleeved with four connecting blocks 21, one end of each of the four connecting blocks 21 is mounted on the side surface of the blocking plate 34, one end of each of the two guide rods 20 is connected with a first compression spring 15, one end of each of the two first compression springs 15 is mounted on the surface of each of the two connecting blocks 21. The pre-tightening force of the first compression spring 15 always pushes the blocking plate 34 so that it can block the discharge port of the hopper 9.

[0040] The two guide rods 20 are each provided with a fixed part 10 at one end, the fixed part 10 is bent, and the other end of the fixed part 10 is installed outside the hopper 9. The fixed part 10 is used to fix the position of the guide rod 20, thereby improving the stability of the sealing plate 34 when sealing the discharge port.

[0041] The two guide rods 20 are each provided with a movable block 22 on the surface, and a through hole is formed between the top of the movable block 22 and the surface of the guide rod 20. A plug rod 25 is inserted between the two through holes, the top end of the plug rod 25 is provided with a connecting plate 24, and a fixed block 11 corresponding in position is arranged below the connecting plate 24. The bottom end of the fixed block 11 is installed above the furnace body 12, so that when the hopper 9 is lowered to the lowest feeding position by the second electric cylinder 8, the connecting plate 24 can be in contact with the fixed block 11.

[0042] The connecting plate 24 and the hopper 9 are connected by a pre-tightening mechanism. The pre-tightening mechanism includes a telescopic rod 26, and the surface of the telescopic rod 26 is provided with a second compression spring 23. The two ends of the telescopic rod 26 and the second compression spring 23 are installed on the surface of the connecting plate 24 and the hopper 9. The telescopic rod 26 is a guide optical axis, and the pre-tightening force of the second compression spring 23 presses downward on the connecting plate 24, thereby providing a force to keep the plug rod 25 in the inserted state.

[0043] The inner wall of the furnace body 12 is wound with an induction coil 33, and the inside of the furnace body 12 is provided with a working furnace lining 31. The inside of the furnace body 12 and the outside of the working furnace lining 31 are filled with coil mastic 29. The top and bottom of the furnace body 12 are respectively provided with an upper structure prefabricated part 28 and a lower structure prefabricated part 30. The bottom of the furnace body 12 is penetrated by a gas diffuser 32. The top of the working furnace lining 31 is provided with a sealing part 27, and the bottom of the furnace cover 4 is placed on the top of the sealing part 27. The bottom end of the fixed block 11 is installed on the top of the upper structure prefabricated part 28. The working furnace lining 31 is made of dry ramming quartz sand or alkaline refractory material to form a smelting cavity, and the coil mastic 29 is a refractory filler layer. The upper structure prefabricated part 28 and the lower structure prefabricated part 30 are made of heat-resistant concrete or prefabricated refractory bricks to protect the end of the furnace body 12 and form a structural support. The furnace cover 4 is a steel shell lined with refractory material, and the bottom contour matches the sealing surface of the sealing part 27. The induction coil 33 generates heat after being energized, thereby heating the raw materials in the working furnace lining 31.

[0044] The gas diffuser 32 is connected with a gas pipe, one end of the gas pipe penetrates the lower structure prefabricated part 30 and is connected with an external gas source (such as an argon cylinder or pipeline).

[0045] The bottom of the furnace body 12 is provided with a base 13, the driving motor 2 is installed on the top of the base 13, the top of the base 13 is installed with a mounting shaft 1 through a bearing support seat, the top end of the mounting shaft 1 is installed on the bottom of the support plate 7, the output end of the driving motor 2 and the surface of the mounting shaft 1 are both installed with mutually meshing gears 3, the mounting shaft 1 is made of high-strength alloy structural steel (such as 42CrMo), which has sufficient bending and torsional strength.

[0046] The bottom of the support plate 7 and the upper end of the mounting shaft 1 are both installed with coaxially arranged mounting plates 5, the four peripheries of the mounting plates 5 are all surrounded by more than three L-shaped fixing rods 14, one end of the fixing rod 14 is installed on the side of the upper mounting plate 5, the bottom end of the fixing rod 14 extends to below the lower mounting plate 5 at the bent position, the bottom end of the fixing rod 14 is installed with universal ball bearings 18, the circular arc surface of the universal ball bearings 18 is in contact with the bottom of the lower mounting plate 5. When the upper and lower mounting plates 5 are assembled, the spherical surface of the universal ball bearings 18 is just in contact with the bottom surface of the lower mounting plate 5. This design makes the overturning moment and radial force generated by the support plate 7 and its load converted into pressure on the bottom surface of the lower mounting plate 5 through the fixing rod 14, and borne by the universal ball bearings 18 with extremely low rolling friction, greatly improving the stability of the rotating action and avoiding shaking.

[0047] The opposite side surfaces of the two mounting plates 5 are both provided with ball groove 16, and a plurality of ball bearings 17 are arranged between the two ball grooves 16. The diameter of the ball bearing 17 is matched with the groove type of the ball groove 16, which plays a role of axial bearing and radial positioning, ensures the concentricity of the rotation of the two mounting plates 5, and bears most of the vertical load.

[0048] In the scheme, the driving motor 2, the first electric cylinder 6 and the second electric cylinder 8 are connected with the PLC controller through wires, and the PLC controller is connected with the external power supply through wires.

[0049] Working principle: when the furnace cover 4 is installed on the top of the sealing element 27, the material required to be put into the hopper 9, the plug rod 25 is inserted into the hole of the movable block 22 and the guide rod 20 under the action of the second compression spring 23, the position of the movable block 22 is locked. Because the movable block 22 is tightly attached to the outermost connecting block 21, the sealing plate 34 cannot slide to the left and is firmly locked in the closed position, and the first compression spring 15 is in the pre-tightening state.

[0050] As Figure 2As shown, when feeding, first control the first electric cylinder 6 to move the furnace cover 4 upward, the driving motor 2 controls the support plate 7 to rotate to make the discharge port of the hopper 9 align with the furnace port, and the second electric cylinder 8 drives the hopper 9 to descend. During the descending process, the connecting plate 24 first contacts the fixed block 11. With the hopper 9 continuing to descend, the connecting plate 24 is blocked by the fixed block 11, while the hopper 9 body continues to move downward, which makes the connecting plate 24 move upward relative to the hopper 9, compresses the second compression spring 23, and at the same time pulls out the insertion rod 25 from the insertion hole. After the lock is released, the elastic potential energy of the first compression spring 15 is released to push the blocking plate 34 and the connecting block 21 and the movable block 22 connected thereto as a whole to slide, so as to open the discharge port, and the materials pour out and fall into the working furnace lining 31, and the feeding operation is completed.

[0051] After the feeding is completed, control the second electric cylinder 8 to drive the hopper 9 to move upward, and then control the output end of the driving motor 2 to drive the support plate 7 to rotate, so as to control the position exchange between the furnace cover 4 and the hopper 9. After the furnace cover 4 moves to the upper side of the furnace body 12, the output end of the first electric cylinder 6 is controlled to extend to press the furnace cover 4 on the top of the sealing element 27, and at the same time, the output end of the second electric cylinder 8 is controlled to extend to move the hopper 9 to the lowest position. At this time, the connecting plate 24 is pushed upward by the staff, the connecting plate 24 drives the insertion rod 25 to move to the upper side of the blocking plate 34, and then the blocking plate 34 is pushed to the discharge port. At this time, the first compression spring 15 is compressed, and after the movable block 22 and the two insertion holes of the guide rod 20 are aligned, the force applied to the connecting plate 24 is removed, and the insertion rod 25 is pushed into the two insertion holes by the action force of the second compression spring 23. At this time, the position of the blocking plate 34 is fixed, and the stability of the materials stored in the hopper 9 is improved.

[0052] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A coreless induction furnace comprising a furnace body (12) and a furnace cover (4), the top of the furnace body (12) being provided with an opening, characterized in that, One side of the furnace body (12) is provided with a driving motor (2), the output end of the driving motor (2) is connected with a support plate (7), the support plate (7) is located above the furnace cover (4), both ends of the support plate (7) are respectively provided with a first electric cylinder (6) and a second electric cylinder (8), the output end of the first electric cylinder (6) is installed on the top of the furnace cover (4), the output end of the second electric cylinder (8) is connected with a hopper (9), the bottom of the hopper (9) is provided with a discharge port, the discharge port is connected with a blocking plate (34) through an elastic locking mechanism; The elastic locking mechanism comprises two guide rods (20), the two guide rods (20) are arranged on the two sides of the blocking plate (34), the surfaces of the two guide rods (20) are slidably sleeved with a plurality of connecting blocks (21), one end of each of the connecting blocks (21) is installed on the side surface of the blocking plate (34), one end of each of the two guide rods (20) is connected with a first compression spring (15), and one end of each of the two first compression springs (15) is installed on the surface of each of the two connecting blocks (21). One end of each of the two guide rods (20) is provided with a fixing piece (10), the fixing piece (10) is in a bent shape, and the other end of the fixing piece (10) is installed outside the hopper (9). The surfaces of the two guide rods (20) are movably sleeved with a movable block (22), a communication insertion hole is formed between the top of the movable block (22) and the surface of the guide rod (20), and an insertion rod (25) is inserted between the two insertion holes, the top end of the insertion rod (25) is installed with a connecting plate (24), a fixed block (11) corresponding in position is arranged below the connecting plate (24), the bottom end of the fixed block (11) is installed above the furnace body (12), and the connecting plate (24) and the hopper (9) are connected through a pre-tightening mechanism. The pre-tightening mechanism comprises a telescopic rod (26), the surfaces of the telescopic rod (26) are sleeved with second compression springs (23), and the two ends of the telescopic rod (26) and the second compression springs (23) are installed on the surfaces of the connecting plate (24) and the hopper (9).

2. A coreless induction furnace as claimed in claim 1, wherein The inner wall of the furnace body (12) is wound with an induction coil (33), the inside of the furnace body (12) is installed with a working furnace lining (31), the inside of the furnace body (12) and the outside of the working furnace lining (31) are filled with coil mastic (29), the top and bottom of the furnace body (12) are respectively provided with an upper structure prefabricated part (28) and a lower structure prefabricated part (30), the bottom of the furnace body (12) is penetrated and installed with a gas diffuser (32), the top of the working furnace lining (31) is provided with a sealing piece (27), the bottom of the furnace cover (4) is arranged on the top of the sealing piece (27), and the bottom end of the fixed block (11) is installed on the top of the upper structure prefabricated part (28).

3. A coreless induction furnace as claimed in claim 2, wherein The gas inlet of the gas diffuser (32) is connected with a gas pipe, one end of the gas pipe penetrates through the lower structure prefabricated part (30) and is connected with an external gas source.

4. A coreless induction furnace as claimed in claim 1, wherein The bottom of the furnace body (12) is provided with a base (13), the driving motor (2) is installed on the top of the base (13), the top of the base (13) is installed with a mounting shaft (1) through a bearing support seat, the top end of the mounting shaft (1) is installed on the bottom of the support plate (7), and the output end of the driving motor (2) and the surface of the mounting shaft (1) are both installed with mutually meshing gear wheels (3).

5. A coreless induction furnace as claimed in claim 4, wherein The bottom of the support plate (7) and the surface of the mounting shaft (1) are both installed with mounting plates (5) arranged in the same axis, the four peripheries of the mounting plates (5) are all surrounded by more than three fixing rods (14), one end of the fixing rod (14) is installed on the side of the upper mounting plate (5), the bottom end of the fixing rod (14) is bent and extended below the lower mounting plate (5), the bottom end of the fixing rod (14) is installed with universal ball bearings (18) at the bent position, and the arc surface of the universal ball bearings (18) is in contact with the bottom of the lower mounting plate (5).

6. A coreless induction furnace as claimed in claim 5, wherein The surface of the two mounting plates (5) is both provided with ball bearing grooves (16), and a plurality of ball bearings (17) are arranged between the two ball bearing grooves (16).

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