Brake drum heating device and heating process

Abstract

The application discloses a brake drum heating device, which comprises at least one heating station and two or more groups of moving workpiece conveying devices. The heating station is provided with a heating coil, and the moving workpiece conveying device is provided with a brake drum positioning mechanism, which can alternately and cyclically move the workpiece to the heating station for heating. The specific structure can be a three-station heating device, which further comprises a feeding station and a preheating station. The preheating station is provided with a preheating coil, and the feeding station, the preheating station and the heating station are fixed stations. The moving workpiece conveying device is divided into three groups, which respectively move and alternately circulate the feeding station, the preheating station and the heating station, and alternately and cyclically convey the workpiece to the preheating station and the heating station. The heating process comprises the following steps: feeding, descending and rotating, ascending and preheating, descending and rotating, ascending and heating, and taking the workpiece, so as to complete the heating. The three groups of workpiece conveying devices alternately complete the above process, realize the assembly line operation, and improve the production efficiency.

Description

Technical Field

[0001] This invention relates to a workpiece heating device, particularly a heating device used in the preparation and repair of metal brake drums, and also to the heating process of such a heating device. Background Technology

[0002] In the manufacturing and repair of metal brake drums, it is necessary to heat the brake drum or the shell of a semi-finished brake drum. Currently, the commonly used heating device is medium-frequency electromagnetic heating. The workpiece to be heated is placed inside a medium-frequency induction coil. After being energized, the heating function is achieved through eddy currents generated by electromagnetic induction.

[0003] For example, in the manufacturing process of bimetallic brake drums, the steel brake drum shell needs to be heated to over 700 degrees Celsius, even reaching 1200 degrees Celsius, to facilitate the centrifugal casting of the gray cast iron friction layer inside the steel shell. Heating the brake drum shell is a crucial and essential process in bimetallic brake drum manufacturing. The steel brake drum shell is placed inside a medium-frequency induction coil and heated through electromagnetic induction. However, current brake drum shell heating is still done on a standalone basis, resulting in low production efficiency. To improve efficiency, some manufacturers employ assembly line operations, using multiple sets of electromagnetic induction heating devices for cyclical heating. This method requires multiple heating systems and multiple independent heating control devices, each still needing independent control during cyclic heating. Different workpieces need to be heated in different heating devices, leading to inconsistent heating effects and temperature differences that affect the casting quality of the brake drum. This heating system, requiring multiple control devices and multiple heating units, suffers from complex structure and high operating and maintenance costs.

[0004] Existing technologies also include equipment that combines heating devices with centrifugal casting production lines for brake drums, such as... Figure 7 As shown, a single heating device is installed on a multi-station centrifugal casting machine to heat the outer shell of each brake drum entering the production line. The electromagnetic heating coil shown in the figure needs to reciprocate to fit the brake drum outer shell on the centrifuge into the heating coil. A multi-station centrifugal casting machine using this heating device requires at least one loading station, one heating station, and one casting station; otherwise, production line operation cannot be achieved. The heating device occupies a certain number of stations, resulting in slow production line operation and difficulty in improving production efficiency. Furthermore, because the heating station is singular and only performs heating without preheating, uneven heating may occur with wavy or differently thick outer shells, leading to uneven temperature rise in different parts of the brake drum outer shell and consequently affecting casting quality.

[0005] For the reasons mentioned above, the inventors have invented a brake drum heating device and developed a brake drum heating process for this device, which can not only realize assembly line brake drum heating, but also ensure uniform heating effect and high production efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a brake drum heating device that can achieve rapid and uniform heating of the brake drum or the brake drum shell.

[0007] Another object of the present invention is to provide a heating process for the above-described heating device.

[0008] The brake drum heating device of the present invention includes at least one heating station and two or more sets of workpiece conveying devices; the heating station is provided with a heating coil, the workpiece conveying device is provided with a workpiece positioning mechanism, and the two or more sets of workpiece conveying devices can alternately and cyclically convey the workpiece to the heating coil of the heating station.

[0009] The brake drum heating device described above further includes a loading station and a preheating station, wherein a preheating coil is provided at the preheating station; the loading station, preheating station, and heating station are fixedly arranged; the workpiece conveying device consists of three sets, which are movable and alternately cyclically corresponding to the loading station, preheating station, and heating station, and alternately cyclically convey the workpiece to the preheating coil of the preheating station and the heating coil of the heating station.

[0010] In the aforementioned brake drum heating device, the feeding station, preheating station, and heating station are arranged on a fixed disk in the same plane, concentrically, with equal diameters and equal arcs; the workpiece conveying device is arranged on a rotating disk in the same plane, concentrically, with equal diameters and equal arcs; the fixed disk and the rotating disk are arranged horizontally parallel to each other with their upper and lower axes coaxially, and the rotating disk is equipped with a rotating device and a lifting device.

[0011] In the aforementioned brake drum heating device, the rotating disc achieves alternating vertical alignment of the workpiece conveying device with the loading station, preheating station, and heating station through rotation; the rotating disc also achieves alternating positioning of the workpiece conveying device at the loading station, preheating station, and heating station through a lifting device. The rotating disc is equipped with a rotating device, and the workpiece conveying device is equipped with a lifting device.

[0012] In the aforementioned brake drum heating device, the rotating disc achieves alternating vertical alignment of the workpiece conveying device with the loading station, preheating station, and heating station through rotation; the workpiece conveying device achieves alternating positioning of the workpiece conveying device at the loading station, preheating station, and heating station through a lifting device.

[0013] In the aforementioned brake drum heating device, the workpiece conveying device is equipped with a rotation device, which drives the workpiece to rotate during preheating or heating.

[0014] The brake drum heating process of the brake drum heating device of the present invention includes the following steps:

[0015] Step 1: Loading: When the rotary table is in a horizontal high position, fix the workpiece on the workpiece conveying device at the loading station;

[0016] The second step is to lower and rotate the rotating disk: the rotating disk is lowered to a low horizontal position and rotated 120 degrees until the workpiece conveying device is below the preheating station;

[0017] The third step is preheating: the rotating disk rises to a high horizontal position, and the workpiece is placed in the preheating coil of the preheating station for preheating.

[0018] Step 4: Lowering and Rotating: The rotary table is lowered to a low horizontal position and rotated 120 degrees until the workpiece conveying device corresponds to the area below the heating station;

[0019] Step 5: Heating up: The rotating disc rises to a high horizontal position, and the workpiece is placed in the heating station heating device for heating;

[0020] Step 6: Remove the workpiece to complete the heating process; the rotary table continues to rotate to enter the next process.

[0021] In the heating process described above, when the workpiece conveying device preheats and heats the workpiece at the preheating station and the heating station, its subsequent workpiece conveying devices are located at the loading station and the preheating station, respectively, to load and preheat the workpiece. Its preceding workpiece conveying devices are located at the heating station and the loading station, respectively, to heat and load the workpiece. When the workpiece is preheated in the preheating coil and heated in the heating coil, the rotation device of the workpiece conveying device drives the workpiece to rotate.

[0022] The brake drum heating process of the brake drum heating device of the present invention includes the following steps:

[0023] Step 1: Loading: When the workpiece conveying device is at a high horizontal position in the loading station, fix the workpiece on the workpiece conveying device;

[0024] The second step is descent and rotation: The workpiece conveying device descends to a low horizontal position, and the rotary table rotates 120 degrees to the position below the preheating station corresponding to the workpiece conveying device.

[0025] The third step is to rise and preheat: When the workpiece conveying device rotates to the preheating station, it rises to a horizontal high position, and the workpiece is preheated in the preheating coil.

[0026] The fourth step is descent and rotation: The workpiece conveying device descends to a low horizontal position, and the rotary table rotates 120 degrees to the position below the heating station corresponding to the workpiece conveying device;

[0027] Fifth step: Heating upon lifting: When the workpiece conveying device rotates to the heating station, it rises to a horizontal high position, and the workpiece is heated inside the heating coil;

[0028] Step 6: Remove the workpiece to complete the heating process; the rotary table continues to rotate to enter the next process.

[0029] In the heating process described above, when the workpiece conveying device preheats and heats the workpiece at the preheating station and the heating station, its subsequent workpiece conveying devices are located at the loading station and the preheating station, respectively, to load and preheat the workpiece. Its preceding workpiece conveying devices are located at the heating station and the loading station, respectively, to heat and load the workpiece. When the workpiece is preheated in the preheating coil and heated in the heating coil, the rotation device of the workpiece conveying device drives the workpiece to rotate.

[0030] The brake drum heating device of this invention can achieve preheating and heating using only a single set of preheating coils and heating coils. Therefore, provided the heating device operates stably and the workpiece itself is uniform, a completely uniform heating effect can be achieved, effectively ensuring a uniform heating temperature of the brake drum shell. Furthermore, since the heating coils and preheating coils can be fixedly installed, the problems of complex heating device structures and high maintenance costs are avoided. The separately installed brake drum heating device separates the heating device from the centrifugal casting machine, preventing the heating device from occupying a workstation on the centrifugal casting machine and improving casting efficiency.

[0031] The heating device of the present invention, combined with the heating process of the present invention, can fully realize mechanized assembly line production and improve production efficiency. Attached Figure Description

[0032] Figure 1 This is a side view of the brake drum heating device according to Embodiment 1 of the present invention;

[0033] Figure 2 This is a top view schematic diagram of the brake drum heating device according to Embodiment 1 of the present invention;

[0034] Figure 3 This is a three-dimensional structural diagram of the brake drum heating device in the horizontal high position according to Embodiment 1 of the present invention;

[0035] Figure 4 This is a three-dimensional structural diagram of the brake drum heating device in the horizontal low position according to Embodiment 1 of the present invention;

[0036] Figure 5 This is a schematic cross-sectional view of the brake drum in the preheated state according to Embodiment 1 of the present invention;

[0037] Figure 6 This is a schematic cross-sectional view of the brake drum in the heating state according to Embodiment 1 of the present invention;

[0038] Figure 7 This is a schematic diagram of a heating device on a centrifugal casting machine in the prior art;

[0039] Figure 8 This is a flow chart of the heating process of the heating device in Embodiment 1 of the present invention.

[0040] In the diagram: 1 is the fixed plate; 11 is the loading station; 12 is the preheating station; 13 is the heating station; 121 is the preheating coil; 122 is the preheating coil frame; 131 is the heating coil; 132 is the heating coil frame.

[0041] 2 is a rotary disk; 21, 22, and 23 are workpiece conveying devices; 221 is a rotation device; 25 is a lifting device; 26 is a rotating device; 27 is a fixed support; 28 is a rotating shaft;

[0042] 31, 32, and 33 are brake drum outer shell parts; 321 is the thicker part. Detailed Implementation

[0043] The brake drum heating device and heating process of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The accompanying drawings and embodiments are only used to explain the technical solutions and are not intended to limit the scope of protection.

[0044] Example 1:

[0045] like Figure 1 , Figure 2 As shown, this embodiment uses a three-position brake drum heating device for illustration. The three-position brake drum heating device of this embodiment includes a fixed part and a rotating part, with the fixed part and the rotating part arranged coaxially.

[0046] The fixed part includes a horizontally positioned fixed plate 1, on which three fixed stations are set: a feeding station 11, a preheating station 12, and a heating station 13. The three fixed stations are arranged in a ring with the same radius and equal arc around the center of the fixed plate 1, and the arc between the three stations is 120 degrees.

[0047] The loading station 11 requires no special structure; it is simply an opening in the fixed plate 1, sized to allow the workpiece brake drum to pass through. The preheating station 12 also has the same opening as the loading station 11, and a preheating coil 121 is installed at this opening. The preheating coil 121 is fixed to a preheating coil frame 122, which is also equipped with a power supply device to ensure the preheating coil 121 is fixedly mounted on the preheating station 12 and to provide preheating power to the preheating coil 121. Figure 5 As shown, the preheating coil 121 is only installed in areas requiring preheating, such as parts of the brake drum housing workpiece 32 that require higher temperatures during casting or areas with greater thickness. In the figure, 321 represents a thicker part of the brake drum housing during casting. These areas may heat up more slowly, affecting the heating rate. Since only partial preheating is performed, the number of turns in the preheating coil 121 can be fewer, and the power can be lower. The purpose of preheating is to ensure a relatively uniform heating rate and temperature across all parts after heating, or to ensure that thicker parts have higher temperatures.

[0048] Heating station 13 also has the same opening as loading station 11, and a heating coil 131 is installed there. Since the purpose of the heating station is to provide comprehensive heating and temperature rise, such as… Figure 6 As shown, heating coils 131 are distributed throughout the cylinder portion of the brake drum housing workpiece 33 for rapid heating of the workpiece. The heating coils 131 are fixedly mounted on a heating coil frame 132, which in turn is fixedly mounted on a mounting plate 1. Power is supplied to the heating coils 131 via a unified power supply device. These heating coils 131 have a high heating power and a large number of turns.

[0049] The reason for setting up a preheating station and a preheating coil is to avoid the wave temperature difference generated by the wavy structure of the brake drum shell when using a single heating device to heat the brake drum shell, or the thickness temperature difference caused by the different thicknesses of the casting layer and the brake drum shell.

[0050] This structure allows the heating coil and preheating coil to be fixed separately, eliminating the need for the heating coil to move with the brake drum conveyor line, thus avoiding complex wiring structures.

[0051] In this embodiment, the rotating part of the heating device includes a rotating disk 2, which is positioned below the fixed disk 1 and is horizontally parallel to it. The axis of the rotating disk 2 coincides with the axis of the fixed disk 1. A rotating shaft 28 is provided on the axis of the rotating disk 2 to achieve horizontal rotation of the disk itself; this horizontal rotation is referred to as revolution. Corresponding to the fixed disk 1, the rotating disk 2 has three sets of workpiece conveying devices 21, 22, and 23 arranged in a ring with the same radius and equal arc, centered on the axis. The arc between the three sets of workpiece conveying devices is 120 degrees. Through the rotation of the rotating disk 2, the three sets of workpiece conveying devices can be positioned below the fixed disk 1, and are respectively cyclically perpendicularly aligned with the loading station 11, the preheating station 12, and the heating station 13.

[0052] like Figure 1 , Figure 2 As shown, three sets of workpiece conveying devices are arranged on the rotary disk 2. Each workpiece conveying device is also equipped with a horizontal rotation device, such as the horizontal rotation device 221 of the workpiece conveying device 22 in this embodiment. The structures of the other workpiece conveying devices are exactly the same as those of the workpiece conveying device 22. This structure allows the workpiece conveying device itself to rotate horizontally around its own rotation axis; this rotation is called self-rotation.

[0053] The rotating disk 2 is equipped with a rotating shaft 28, around which it can rotate. A rotating device 26 is also provided. The rotating shaft 28 is mounted on a fixed bracket 27, which serves as the support structure for the rotating part in this embodiment. The rotating disk 2 is also equipped with a lifting device 25, which drives the rotating disk 2 to perform reciprocating motion, enabling the rotating disk 2 to rise and fall, and changing the vertical distance between the rotating disk 2 and the fixed disk 1, thus allowing the rotating disk 2 to switch between a high horizontal position and a low horizontal position.

[0054] like Figure 4 As shown, when the rotary table 2 is in a horizontal high position, the three sets of workpiece conveying devices 21, 22, and 23 can be positioned at the loading station 11, the preheating station 12, and the heating station 13, respectively. At this time, the workpiece conveying device 21 at the loading station 11 receives the brake drum shell workpiece 31 to be heated, which is transferred by the robot arm, and positions it on the workpiece conveying device 21. The workpiece conveying device 22 at the preheating station 12 places the positioned brake drum shell workpiece 32 into the preheating coil 121 for preheating. The workpiece conveying device 23 at the heating station 13 places the positioned brake drum shell workpiece 33 into the heating coil 131 for heating. However, the above is only a specific state in one work cycle. Since the rotary table 2 rotates, the relationship between the workpiece conveying devices and the fixed stations is dynamically alternating and changing cyclically.

[0055] like Figure 3 As shown, when the rotating disk 2 is in a low horizontal position, the workpiece conveying device moves downward with the rotating disk 2 and thus disengages from the fixed position on the fixed disk 1. At this time, after rotating the rotating disk 2 to 120 degrees, the correspondence between the workpiece conveying device and the fixed position is changed, and the rotating disk 2 is raised again. This can realize the cyclical alternation between the workpiece conveying device and the fixed position, and realize assembly line operation.

[0056] Since each workpiece conveying device is equipped with a rotating device, the workpiece conveying device can rotate on its own. The rotation of the workpiece conveying device can enable the workpiece of the brake drum shell to rotate within the preheating station 12 and the heating station 13, making the preheating and heating more uniform.

[0057] The heating process of the device in this embodiment 1 is as follows. The process is described as one cycle, with the heating of one brake drum shell as the starting point.

[0058] First, the initial state is that the rotating disk 2 is in a horizontal low position, such as... Figure 3 As shown in the diagram, the preheated brake drum shell workpiece 32 and the heated brake drum shell workpiece 33 are fixedly placed on the two sets of workpiece conveying devices 22 and 23 on the rotary table 2, respectively. The workpiece conveying device 21 corresponding to the loading station 11 is in an idle state.

[0059] After the device is turned on, the first step begins. The lifting device 25 of the rotating disk 2 operates first, raising the rotating disk 2 to a horizontal high position. The three sets of workpiece conveying devices 21, 22, and 23 are respectively located at the loading station 11, preheating station 12, and heating station 13 on the fixed disk. Figure 4 The state shown.

[0060] The second step involves the robotic arm transporting the brake drum housing workpiece 31 with its opening facing upwards to the loading station 11, where it is placed on the workpiece conveying device 21 positioned at the loading station 11. This is assumed to be device 21, but it actually changes alternately. Simultaneously, workpiece conveying devices 22 and 23 are located at the preheating station 12 and heating station 13, respectively. Workpiece conveying device 22 feeds the preheated brake drum housing workpiece 32 into the preheating coil 121 for preheating, while workpiece conveying device 23 feeds the heated brake drum housing workpiece 33 into the heating coil 131 for heating. After heating is complete, an unloading operation is performed, and workpiece conveying device 23 becomes idle.

[0061] The third step involves the operation of the rotating disc lifting device 25, which lowers the rotating disc 2 to a low horizontal position. Returning to... Figure 3 The state shown.

[0062] The fourth step involves the operation of the rotating disk rotation device 26, which rotates the rotating disk 2 by 120 degrees, changing the correspondence between the workpiece conveying device and the fixed station. At this time, the workpiece conveying device 21, which holds the brake drum outer shell workpiece 31, moves to the vertical position corresponding to the preheating station 12. Meanwhile, the other workpiece conveying devices 22 and 23 are respectively vertically corresponding to the heating station 13 and the loading station 11 of the fixed disk 1, with the workpiece conveying device 23 in an idle state.

[0063] The fifth step involves the lifting device 25 of the rotating disk 2 operating again, raising the rotating disk 2 to a horizontal high position. At this time, the workpiece conveying device 21, which holds the brake drum outer shell workpiece 31, is located at the preheating station 12, the workpiece conveying device 22 is located at the heating station 13, and the workpiece conveying device 23 is idle at the loading station 11. The brake drum outer shell workpiece 31 is now a preheated workpiece undergoing preheating, while the previously preheated brake drum outer shell workpiece 32 becomes a heated workpiece undergoing heating. The workpiece conveying device 23 is now located at the corresponding position in the loading station 11, and a robotic arm then places subsequent brake drum outer shell workpieces onto this workpiece conveying device 23.

[0064] The sixth step is to activate the rotation device 221 of the workpiece conveying device 21 to enable it to rotate, and simultaneously connect the medium frequency power supply to the preheating coil 121 to preheat the brake drum shell workpiece 31 located inside it. Simultaneously, the robot arm must transport the brake drum shell workpiece to the loading station 11 again and place it on the workpiece conveying device 23 for positioning, completing the second loading.

[0065] The seventh step is for the rotating disk lifting device 25 to operate again, lowering the rotating disk 2 back to the horizontal low position.

[0066] The eighth step involves rotating the rotary table another 120 degrees, changing the correspondence between the workpiece conveying device and the fixed station. The workpiece conveying device 21, along with the brake drum housing workpiece 31, rotates to the vertically corresponding position of the heating station 13. At this time, the conveying device 23, which holds the brake drum housing workpiece, is located vertically corresponding to the preheating station 12, while the conveying device 22, which does not hold the brake drum housing workpiece, is located vertically corresponding to the loading station 11.

[0067] The ninth step involves the rotary table 2 rising again to a high horizontal position. At this time, the workpiece conveying device 21 and the brake drum shell workpiece 31 are located within the heating coil 131 of the heating station 13, and are heated by electricity. Simultaneously, the workpiece conveying device 21 rotates to achieve uniform heating. The brake drum shell workpiece 33 of the workpiece conveying device 23 is located within the preheating coil 121 of the preheating station 12 for preheating, and rotates at the same time. The workpiece conveying device 22 is located in the loading station 11 and simultaneously receives the third workpiece brake drum conveyed by the robot arm.

[0068] The tenth step involves heating the workpiece conveying device 21 and the brake drum housing workpiece 31 to a predetermined temperature, stopping their rotation, and then using a robotic arm to remove the heated workpiece brake drum, completing a full heating process. Next, the rotating disk 2 descends again to begin the next cycle.

[0069] The above process involves three lifts and three drops and three rotations of the rotary disc 2, completing the three steps of positioning, preheating, and heating of the three brake drum shells. This enables rotary cyclic operation, which can improve production efficiency per unit time. At the same time, since the heating devices of the preheating station 12 and the heating station 13 are fixed, setting the working parameters is relatively simple. Each workpiece is preheated at the same preheating station and heated at the same heating station, achieving uniform heating effect under the premise that the workpieces are consistent.

[0070] The rotating device 221 of the workpiece conveying device does not rotate during workpiece loading and unloading, ensuring the stable operation of the robot.

[0071] Example 2:

[0072] The structure of this embodiment is basically the same as that of Embodiment 1, except that the rotating disk 2 itself no longer has a lifting device 25, and the rotating disk 2 itself does not perform lifting or lowering actions. Instead, a lifting device is installed on the workpiece conveying device, so that each group of workpiece conveying devices can achieve independent lifting and lowering actions. The rotation of the rotating disk and the independent lifting and lowering of the workpiece conveying devices realize the function of cyclic positioning of the workpiece conveying devices, and realize the above-mentioned process.

[0073] Example 3:

[0074] The above embodiment can also be simplified to a structure with only two fixed stations and two sets of workpiece conveying devices. The preheating station 12 is no longer provided on the fixed platen 1; only the loading station 11 and the heating station 13 are provided. After loading is completed at the loading station 11, the descending rotary platen 2 rotates to the heating station 13, then rises directly into the heating station 13 for heating. This constitutes a two-station heating device. During operation, only two lifting and rotating maneuvers are needed to achieve the purpose of alternating heating in a continuous flow operation. The two-station heating device in this embodiment heats directly from the loading temperature, which may take longer, but it may be more suitable for workpieces made of certain materials, such as brake drum shells without a corrugated structure and of the same thickness.

[0075] Example 4:

[0076] This embodiment can be further simplified based on embodiment 3, while still achieving the basic functions of the present invention. For example, instead of a dedicated fixed plate 1, only a heating station with a heating coil 131 is provided. Since the loading station 11 does not require any other special structure and does not need to be set up separately, the workpiece brake drum can be directly transported to the workpiece conveying device by a robotic arm. This can be achieved by alternately feeding the workpieces into the heating station 13 after the two sets of workpiece conveying devices have placed them.

[0077] Example 5:

[0078] This embodiment can be further simplified based on embodiment 3, setting up two fixed workstations and two sets of workpiece conveying devices. Instead of a dedicated loading station, the loading and preheating stations are integrated into one station, where loading and preheating are performed. The other station performs heating and unloading operations.

[0079] The heating device of the present invention can also be made into a four-station, five-station or even six-station structure. Of course, each additional station can also add a heating step. The smaller the heating step, the more beneficial it may be to the heating effect of the brake drum. However, since the number of stations increases, more operating steps are required. For example, with six stations, the rotating disc needs to be raised and lowered six times to complete one cycle, and one cycle will heat six workpieces.

[0080] In summary, the structure of the present invention should not be limited to the above embodiments. Any improvements made by those skilled in the art based on the present invention without departing from the basic idea of ​​the present invention should fall within the protection scope of the present invention.

Claims

1. A brake drum heating device, which is a three-position brake drum induction heating device, characterized in that: The system includes a fixed disk with a heating station, a preheating station, and a loading station arranged concentrically, with equal diameters and equal arcs, and a rotating disk with three sets of workpiece conveying devices arranged concentrically, with equal diameters and equal arcs, all with an arc of 120 degrees between them. The heating station is equipped with a heating coil, and the preheating station is equipped with a preheating coil. The heating coil has a large number of turns and high power, distributed throughout the entire body of the brake drum shell, while the preheating coil has fewer turns and lower power, and is only installed in the thicker parts of the brake drum shell. The workpiece conveying devices are equipped with workpiece positioning mechanisms. The three sets of workpiece conveying devices can move alternately and cyclically to correspond to the loading station, preheating station, and heating station, alternately and cyclically conveying workpieces to the heating coils in the heating station and the preheating coils in the preheating station. The workpiece conveying devices are equipped with a rotation device, which drives the workpiece to rotate during preheating or heating. The fixed disk and the rotating disk are arranged horizontally and parallel to each other with coaxial axes, and the rotating disk is equipped with a rotation device and a lifting device.

2. The brake drum heating device according to claim 1, characterized in that: The rotating disk rotates to achieve alternating vertical alignment of the workpiece conveying device with the loading station, preheating station, and heating station; the rotating disk uses a lifting device to achieve alternating positioning of the workpiece conveying device at the loading station, preheating station, and heating station.

3. A brake drum heating device, which is a three-position brake drum induction heating device, characterized in that: The system includes a fixed disk with a heating station, a preheating station, and a loading station arranged concentrically, with equal diameters and equal arcs, and a rotating disk with three sets of workpiece conveying devices arranged concentrically, with equal diameters and equal arcs, all with an arc of 120 degrees between them. The heating station is equipped with a heating coil, and the preheating station is equipped with a preheating coil. The heating coil has a large number of turns and high power, distributed throughout the entire body of the brake drum shell, while the preheating coil has fewer turns and lower power, only located in the thicker parts of the brake drum shell. The workpiece conveying devices are equipped with workpiece positioning mechanisms. The three sets of workpiece conveying devices can move alternately and cyclically to correspond to the loading station, preheating station, and heating station, alternately and cyclically conveying workpieces to the heating coils in the heating station and the preheating coils in the preheating station. The workpiece conveying devices are equipped with a rotation device, which drives the workpiece to rotate during preheating or heating. The fixed disk and the rotating disk are arranged horizontally and coaxially, with the rotating disk equipped with a rotation device, and the workpiece conveying devices are equipped with a lifting device.

4. The brake drum heating device according to claim 3, characterized in that: The rotating disk rotates to allow the workpiece conveying device to alternately and cyclically correspond to the loading station, preheating station, and heating station; the workpiece conveying device uses a lifting device to alternately and cyclically position itself at the loading station, preheating station, and heating station.

5. A brake drum heating process for a brake drum heating device as described in claim 1 or 2, characterized in that: Includes the following processes: Step 1: Loading: When the rotary table is in a horizontal high position, fix the workpiece on the workpiece transfer device at the loading station; The second step is to lower and rotate the rotating disk: the rotating disk is lowered to a horizontal low position and then rotated 120 degrees; The third step is to raise the preheating position: the rotating disk is raised to a high horizontal position, and the workpiece is placed in the preheating coil of the preheating station for preheating. Step 4: Lowering and Rotating: The rotating disk is lowered to a horizontal low position and then rotated 120 degrees; Step 5: Heating up: The rotating disc rises to a high horizontal position, and the workpiece is placed in the heating station heating device for heating; Step 6: Remove the workpiece to complete the heating process; the rotary table continues to rotate to enter the next process.

6. The heating process according to claim 5, characterized in that: When the workpiece conveying device preheats and heats the workpiece at the preheating station and heating station, its subsequent workpiece conveying devices are located at the loading station and preheating station, respectively, to load and preheat the workpiece. Its preceding workpiece conveying devices are located at the heating station and loading station, respectively, to heat and load the workpiece. When the workpiece is preheated in the preheating coil and heated in the heating coil, the rotation device of the workpiece conveying device drives the workpiece to rotate.

7. A brake drum heating process for a brake drum heating device as described in claim 3 or 4, characterized in that... Includes the following processes: Step 1: Loading: When the workpiece conveying device is at a high horizontal position in the loading station, fix the workpiece on the workpiece conveying device; The second step is descent and rotation: The workpiece conveying device descends to a low horizontal position, and the rotary table rotates 120 degrees; The third step is to rise and preheat: When the workpiece conveying device rotates to the preheating station, it rises to a horizontal high position, and the workpiece is preheated in the preheating coil. The fourth step is descent and rotation: The workpiece conveying device descends to a low horizontal position, and the rotary table rotates 120 degrees; Fifth step: Heating upon lifting: When the workpiece conveying device rotates to the heating station, it rises to a high horizontal position, and the workpiece is preheated inside the heating coil; Step 6: Remove the workpiece to complete the heating process; the rotary table continues to rotate to enter the next process.

8. The heating process according to claim 7, characterized in that: When the workpiece conveying device preheats and heats the workpiece at the preheating station and heating station, its subsequent workpiece conveying devices are located at the loading station and preheating station, respectively, to load and preheat the workpiece. Its preceding workpiece conveying devices are located at the heating station and loading station, respectively, to heat and load the workpiece. When the workpiece is preheated in the preheating coil and heated in the heating coil, the rotation device of the workpiece conveying device drives the workpiece to rotate.

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