High-temperature rotary heating furnace

Abstract

The high-temperature rotary heating furnace comprises a rack and a furnace body, the furnace body comprises a furnace shell, a hearth and a feeding and discharging furnace door, the furnace shell is arranged on the rack, the hearth is arranged in the furnace shell, the feeding and discharging furnace door is arranged at one end of the furnace shell and connected with a door opening and closing mechanism, and a heating assembly is arranged at the top of the furnace shell. The rack is further provided with a rotary table assembly and a rotation driving mechanism for driving the rotary table assembly to rotate, the rotary table assembly penetrates through the furnace shell and is located in the hearth, and a sealing mechanism is arranged between the rotary table assembly and the hearth. The device has the advantage that the heating uniformity and the reaction effect of all parts of the workpiece are improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal heat treatment, and in particular to a high-temperature rotary heating furnace. Background Art

[0002] In modern industry, high-temperature alloys such as stainless steel and titanium alloy are widely used for their superior corrosion resistance, high temperature resistance and mechanical properties. The material has good plasticity and weldability and is suitable for a variety of complex manufacturing processes. It is usually used to manufacture equipment parts that withstand high temperature, high pressure and corrosive environments, such as aviation components, high-temperature furnaces and chemical equipment. In the hot forging and warm forging processes, the high-temperature alloy blank must first be heated, the purpose of which is to improve the plasticity of the metal, reduce deformation resistance, make it easy to flow and form, and obtain a good post-forging structure. Therefore, pre-forging heating is an important part of the entire forging process, which has a direct impact on improving forging productivity, ensuring forging quality, and saving energy consumption.

[0003] The performance (such as the speed of heating and cooling, the ability to maintain the required temperature, the working conditions of workers) and service life of the heating furnace not only affect the realization of the heating process and the quality of the product, but also affect the production cost of the enterprise. Therefore, there are strict technical requirements for the use of heating furnaces: 1. During heat treatment, the temperature difference allowed on the cross section of the metal workpiece is relatively small, and the heating is required to be uniform or the temperature distribution meets the requirements: 2. When performing metal heat treatment, it is necessary to ensure that the metal has minimal decarbonization and oxidation.

[0004] The heat treatment furnaces currently on the market are heated by electric heating tubes or gas. Heat treatment furnaces with this structure have the disadvantage that the temperature in the area close to the heating element is high, and the temperature in the area far away from the heating element is low. In order to make the temperature in the furnace uniform, fans are often used to make the air flow in the furnace to achieve the purpose of uniform temperature. However, the use temperature of the fan is limited, and the 1250℃ heating requirement for high-temperature alloys cannot be met, and the pre-forging heating requirement in a neutral atmosphere cannot be met. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high-temperature rotary heating furnace which can improve the heating uniformity and reaction effect of various parts of a workpiece.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A high-temperature rotary heating furnace comprises a frame and a furnace body, wherein the furnace body comprises a furnace shell, a furnace chamber and a furnace inlet and outlet door, wherein the furnace shell is arranged on the frame, the furnace chamber is arranged in the furnace shell, the furnace inlet and outlet door is arranged at one end of the furnace shell and is connected with an opening and closing door mechanism, a heating assembly is arranged on the top of the furnace shell, a turntable assembly and a rotary drive mechanism for driving the turntable assembly to rotate are also arranged on the frame, the turntable assembly passes through the furnace shell and is located in the furnace chamber, and a sealing mechanism is arranged between the turntable assembly and the furnace chamber.

[0008] As a further improvement of the above technical solution:

[0009] The turntable assembly includes a firing tray, a mounting seat, a heat-insulating layer and a turntable. The turntable is connected to a rotary drive mechanism. The heat-insulating layer is arranged on the turntable. The firing tray is mounted on the heat-insulating layer through the mounting seat.

[0010] The mounting seat includes a chuck and a clamping tube, the chuck is embedded in the insulation layer, the chuck is provided with a clamping slot, the clamping tube is arranged in the middle of the clamping slot, the bottom of the supporting plate is provided with a clamping block, the middle is provided with a positioning hole, the clamping block is clamped in the clamping slot, and the positioning hole is sleeved outside the clamping tube.

[0011] A plurality of support columns are arranged at the bottom of the support plate, and the plurality of support columns are arranged at intervals along the circumference of the support plate. The support columns are supported in the heat-insulating layer, and a cushion block is arranged at the bottom.

[0012] The support plate is provided with a plurality of charging areas, and the plurality of charging areas are arranged at intervals along the circumference of the support plate, and the charging areas are provided with anti-slip patterns and air holes.

[0013] A maintenance furnace door is provided at the other end of the furnace shell, a feed channel is provided at one end of the furnace chamber, and a maintenance channel is provided at the other end, the feed channel is located between the inlet and outlet furnace door and the firing tray, the inner side of the furnace chamber is provided with a spliced ​​arc surface and a square surface, the arc surface is arranged close to the feed channel, the firing tray is docked with the feed channel through the arc surface, a material blocking flange with the same height as the feed channel is provided on the surrounding side of the firing tray, the square surface is arranged close to the maintenance channel, an anti-stuck material structure is also provided between the furnace chamber and the firing tray, the anti-stuck material structure includes a square material receiving groove and a transition inclined surface, the square material receiving groove is located on the inner side of the square surface, the height of the square material receiving groove is lower than the firing tray, and the width is greater than the feed channel, the feed channel and the square material receiving groove are respectively located on the opposite sides of the firing tray, and the transition inclined surface is located between the furnace chamber, the firing tray and the square material receiving groove.

[0014] The sealing mechanism includes an annular oil seal chamber, a cooling water tank, a fixed oil seal knife and a rotating oil seal knife. The annular oil seal chamber is arranged in the cooling water tank. The fixed oil seal knife and the rotating oil seal knife are both located in the annular oil seal chamber. The fixed oil seal knife is arranged at the bottom of the furnace shell, and the rotating oil seal knife is arranged at the bottom of the turntable assembly. The bottom of the cooling water tank is connected with a water inlet and a drain port, and the top is connected with a water outlet. The cooling water tank is also provided with a water level gauge, and the annular oil seal chamber is provided with a refueling port and an oil level gauge.

[0015] A temperature measuring component is provided on the top of the furnace shell, and the temperature measuring component includes a temperature control thermocouple and a calibration thermocouple. The temperature control thermocouple is parallel to the calibration thermocouple and both are arranged vertically. The temperature control thermocouple is electrically connected to the control module, and the control module is electrically connected to the heating component.

[0016] The frame is provided with a photoelectric sensor, the bottom of the turntable assembly is provided with a reflective plate, the reflective plate is provided with a zero mark, and the photoelectric sensor faces the reflective plate.

[0017] A material storage platform is arranged outside the inlet and outlet furnace door, and a detection mechanism is arranged on the furnace shell, and the detection mechanism is used to detect the moving state of the inlet and outlet furnace door and the material storage state of the material storage platform.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] The high-temperature rotary heating furnace disclosed in the present invention has a high-temperature rotary heating furnace. The turntable assembly rotates, which drives the material to rotate, thereby improving the uniformity of heating of the material and fully contacting the material with process gas and inert gas, improving temperature uniformity, reducing material oxidation, and improving the yield. At the same time, the rotation of the turntable assembly can also promote the circulation of gas in the furnace, so that the gas temperature distribution in various places in the furnace is uniform, thereby further improving the uniformity of heating of various parts of the workpiece. A sealing mechanism is provided between the turntable assembly and the furnace chamber, which can ensure the sealing of the furnace and the reaction effect.

[0020] Furthermore, in the high-temperature rotary heating furnace disclosed in the present invention, the firing plate can carry multiple materials to improve the reaction efficiency, and a loading area is provided to simply position multiple materials to prevent multiple materials from colliding with each other when the firing plate rotates. At the same time, the surface of the loading area is provided with an anti-slip pattern to prevent the material from moving or even sliding from the loading area, and the air holes can facilitate heat conduction.

[0021] Furthermore, the high-temperature rotary heating furnace disclosed in the present invention has an inner side of a furnace chamber that is round in front and square in rear, with an arc surface on the front side and a square surface on the rear side. The firing tray cooperates with the feed channel through the arc surface to reduce the gap between the firing tray and the feed channel, facilitate docking and avoid material jamming, and the material blocking flange on the side of the firing tray can block the heating residues from falling into the gap between the firing tray and the furnace chamber; a square material receiving trough is provided on the inner side of the square surface, and the height of the square material receiving trough is lower than that of the firing tray, and is a sunken type; and a transition slope is provided between the furnace chamber, the firing tray and the square material receiving trough. If the material accidentally slides off the firing tray during rotation, it will fall from the transition slope to the square material receiving trough due to its own gravity and centrifugal force, and can finally be taken out by opening the maintenance furnace door, which can avoid material jamming and affecting the rotation of the firing tray and the heating of the material.

[0022] Furthermore, in the high-temperature rotary heating furnace disclosed in the present invention, a fixed oil sealing knife is arranged at the bottom of the furnace shell and is stationary, and a rotating oil sealing knife is arranged at the bottom of the turntable assembly and rotates with the turntable assembly. The fixed oil sealing knife and the rotating oil sealing knife are inserted into the sealing oil in the annular oil sealing cavity to dynamically seal the gap between the furnace shell and the turntable assembly. The annular oil sealing cavity is provided with an oil level gauge, and the sealing oil is replenished through the refueling port when refueling is needed; the annular oil sealing cavity is a cooling water tank, and cooling water is introduced into the interior to directly cool the oil. The cooling water tank is also equipped with a water level gauge to detect the liquid level of the cooling water tank.

[0023] Furthermore, in the high-temperature rotary heating furnace disclosed in the present invention, the temperature-controlling thermocouple detects the temperature inside the furnace and sends it to the control module. The control module controls the heating power of the heating component, thereby achieving the purpose of adjusting the heating temperature inside the furnace. The temperature-controlling thermocouple is parallel to the calibration thermocouple and both are arranged vertically, so that the temperature-controlling thermocouple can be calibrated through the calibration thermocouple after deviation occurs in the temperature-controlling thermocouple after being used for a period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view cross-sectional structural schematic diagram of the high-temperature rotary heating furnace of the present invention.

[0025] Figure 2 It is a side view cross-sectional structural schematic diagram of the high-temperature rotary heating furnace of the present invention.

[0026] Figure 3 It is a structural schematic diagram of the sintering tray in the present invention.

[0027] Figure 4 It is a structural schematic diagram of the anti-stuck material structure in the present invention.

[0028] Figure 5 It is a structural schematic diagram of the sealing mechanism in the present invention.

[0029] Figure 6 It is a structural schematic diagram of the rotary drive mechanism in the present invention.

[0030] The reference numerals in the figure indicate: 1, frame; 12, support foot cup; 13, caster; 2, furnace body; 21, furnace shell; 22, furnace chamber; 221, feed channel; 222, inspection channel; 223, curved surface; 224, square surface; 23, inlet and outlet furnace door; 24, heating component; 25, inspection furnace door; 26, storage table; 27, detection mechanism; 28, induced draft hood; 3, turntable assembly; 31, firing tray; 311, clamping block; 312, positioning hole; 313, support column; 314, cushion block; 315, charging area; 316, anti-slip pattern; 317, air hole; 318, material blocking flange; 32, mounting seat; 321, chuck; 322, clamping pipe; 323, card slot; 33, insulation layer; 34, turntable; 4, rotary drive mechanism; 41, support frame; 42, hollow turntable; 43, planetary reducer; 44, servo motor; 45, cooling fan; 5, sealing mechanism; 51, annular oil seal chamber; 511, refueling port; 512, oil level gauge; 52, cooling water tank; 521, water inlet; 522, drain outlet; 523, water outlet; 524, water level gauge; 53, fixed oil seal knife; 54, rotary oil seal knife; 6, anti-stuck material structure; 61, square material receiving trough; 62, transition slope; 7, temperature measuring component; 71, temperature control thermocouple; 72, calibration thermocouple; 8, door opening and closing mechanism; 9, foot pedal. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Figures 1 to 6 An embodiment of a high-temperature rotary heating furnace of the present invention is shown. The high-temperature rotary heating furnace of this embodiment includes a frame 1 and a furnace body 2. The furnace body 2 includes a furnace shell 21, a furnace chamber 22 and an inlet and outlet furnace door 23. The furnace shell 21 is arranged on the frame 1, and the furnace chamber 22 is arranged in the furnace shell 21. The inlet and outlet furnace door 23 is arranged at one end of the furnace shell 21 and is connected to an opening and closing door mechanism 8. A heating component 24 is provided on the top of the furnace shell 21. A turntable component 3 and a rotating drive mechanism 4 for driving the turntable component 3 to rotate are also provided on the frame 1. The turntable component 3 passes through the furnace shell 21 and is located in the furnace chamber 22. A sealing mechanism 5 is provided between the turntable component 3 and the furnace chamber 22.

[0036] The heating process of the high-temperature rotary heating furnace is as follows: the opening and closing door mechanism 8 drives the inlet and outlet furnace door 23 to open, the material is placed on the turntable assembly 3, the inlet and outlet furnace door 23 is closed, the process gas and inert gas are introduced, the heating assembly 24 starts heating, and at the same time the rotary drive mechanism 4 drives the turntable assembly 3 to rotate.

[0037] In the high-temperature rotary heating furnace, the turntable assembly 3 rotates, driving the material to rotate, thereby improving the uniformity of heating of the material, and fully contacting the process gas and the inert gas, improving the temperature uniformity, reducing material oxidation, and improving the yield. At the same time, the rotation of the turntable assembly 3 can also promote the gas circulation in the furnace, so that the gas temperature distribution in various places in the furnace is uniform, thereby further improving the heating uniformity of various parts of the workpiece, and a sealing mechanism 5 is provided between the turntable assembly 3 and the furnace 22 to ensure the sealing of the furnace and the reaction effect.

[0038] Preferably, the furnace shell 21 is a box body welded by carbon steel profiles and steel plates, the frame 1 is a frame-type steel structure, and there is a lifting lug on the top for overall lifting and transfer, the furnace 22 is built with DJM-30 mullite bricks, and the outer insulation material adopts 1500 zirconium-containing ceramic fiber modules, which are formed by folding and extruding a fiber blanket and anchored to the side wall of the furnace shell 21; the top of the furnace shell 21 uses reaction-sintered silicon carbide square beams as supporting beams, and a corundum mullite cover plate is laid on the beam to support the top insulation layer and reflect heat radiation at the same time to improve the heating efficiency; the furnace top insulation material adopts an integrated insulation top, which is composed of 1500 zirconium-containing ceramic fiber modules, anchored on the furnace top cover flange, and can be lifted and uncovered at the same time as the top cover, which is simple to maintain.

[0039] Preferably, the inlet and outlet furnace door 23 is located on the front of the furnace shell 21 for personnel to load and unload materials, and can be opened and closed manually and automatically. The shell is made of SUS304 stainless steel, and the furnace door insulation material is made of zirconium-containing 1500 fiber products, and high-quality ceramic fiber cotton is pasted around it; the furnace door frame is DJM-30 mullite brick, equipped with spare bricks, and the furnace door size can be flexibly adjusted. High-quality ceramic fiber cotton is also pasted around the furnace door frame; the opening and closing door mechanism 8 is a cylinder, and the cylinder controls the up and down lifting and opening and closing, and the descending speed is ≥70mm / s. There are stainless steel slide rails on both sides of the furnace door to guide and limit the lifting of the furnace door. The track at the furnace door is bent inward, and in the furnace When the door is closed, positive pressure can be generated on the furnace door frame to ensure that the fiber cotton fits tightly and the furnace door is sealed; a manual lever is provided on the side to manually open the door when there is no compressed air or power is off, and a foot pedal 9 is provided to control the opening and closing, which is linked with the turntable assembly 3 and can be adjusted by a time relay. The specific linkage is: step on the foot pedal 9 to open the door, the furnace door opens automatically, and after the personnel puts the workpiece into the turntable assembly 3 in the furnace with a clamp, step on the foot pedal 9 to close the door, and the furnace door closes automatically. There is an emergency stop lever above the foot pedal 9 switch, which can stop the equipment with one click in case of emergency; the opening and closing action is not related to the power supply of the heating assembly 24, and does not affect the heating power supply.

[0040] Preferably, the heating assembly 24 includes ED type high-quality silicon carbon rods, 12 in number, 6 in front and 6 in the back connected as a group as a heating temperature zone. The silicon carbon rods are evenly distributed in height, the external wiring is located in the carbon steel heating box, and the outer cover plate is sealed. The heating box uses stainless steel electrodes and aluminum braided belts to connect the silicon carbon rods for power supply, and is covered with short porcelain tubes and ceramic insulating plugs. It uses a three-phase star connection method, and the power supply is balanced and has high stability.

[0041] Preferably, the inlet and outlet furnace door 23 is provided with an induced draft hood 28 made of SUS304 stainless steel. When the furnace door is opened, the induced draft hood 28 can collect and lead the hot air to the top to reduce the risk of hot air overflowing and scalding personnel. The bottom of the frame 1 is provided with rubber shock-absorbing support foot cups 12 and casters 13 to reduce the vibration and impact of the furnace body 2 and ensure stable operation of the equipment; the casters 13 use heavy-duty iron core polyurethane rollers, which can flexibly adjust the site position and orientation of the furnace body 2 according to the process layout and are suitable for different factory buildings; a ladder is installed on the back of the furnace shell 21, which can allow personnel to go up and down the furnace top for maintenance.

[0042] Furthermore, in this embodiment, the turntable assembly 3 includes a firing tray 31, a mounting seat 32, a thermal insulation layer 33 and a turntable 34, the turntable 34 is connected to the rotary drive mechanism 4, the thermal insulation layer 33 is arranged on the turntable 34, and the firing tray 31 is installed on the thermal insulation layer 33 through the mounting seat 32. The rotary drive mechanism 4 drives the turntable 34 to rotate, thereby driving the thermal insulation layer 33, the mounting seat 32 and the firing tray 31 to rotate, and the thermal insulation layer 33 is arranged under the firing tray 31, which can keep the temperature in the furnace warm and ensure the reaction effect, and also play a certain heat insulation role to avoid damage to the rotary drive mechanism 4. Preferably, the thermal insulation layer 33 is made of 1500 zirconium-containing ceramic fiber products, which are formed by multiple disc-shaped modules nested with each other.

[0043] Furthermore, in this embodiment, the mounting seat 32 includes a chuck 321 and a clamping tube 322, the chuck 321 is embedded in the thermal insulation layer 33, the chuck 321 is provided with a clamping groove 323, the clamping tube 322 is arranged in the middle of the clamping groove 323, the bottom of the firing tray 31 is provided with a clamping block 311, the middle is provided with a positioning hole 312, the clamping block 311 is clamped in the clamping groove 323, and the positioning hole 312 is sleeved outside the clamping tube 322. The chuck 321 and the clamping groove 323 are used to fix the firing tray 31 on the mounting seat 32. Preferably, the chuck 321 and the clamping tube 322 are also made of reaction-sintered silicon carbide material, and the clamping tube 322 is installed vertically, and the top is higher than the positioning hole 312 to block the workpiece from falling into the positioning hole 312.

[0044] Furthermore, in this embodiment, a plurality of support columns 313 are provided at the bottom of the setter tray 31, and the plurality of support columns 313 are arranged at intervals along the circumference of the setter tray 31. The support columns 313 are supported in the insulation layer 33, and a cushion block 314 is provided at the bottom. The support columns 313 evenly support the circumference of the setter tray 31 to prevent the setter tray 31 from swinging up and down due to pressure concentration. The cushion block 314 at the bottom of the support column 313 increases the contact area with the insulation layer 33 to prevent the insulation layer from being damaged due to pressure concentration. Preferably, the support column 313 is made of a hollow ball.

[0045] Furthermore, if Figure 3 As shown, in this embodiment, the setter 31 is provided with a plurality of charging areas 315, and the plurality of charging areas 315 are arranged at intervals along the circumference of the setter 31, and the charging areas 315 are provided with anti-skid patterns 316 and air holes 317. The setter 31 can carry multiple materials to improve the reaction efficiency. The charging areas 315 are provided to simply position multiple materials to prevent multiple materials from colliding with each other when the setter 31 rotates. At the same time, the surface of the charging area 315 is provided with an anti-skid pattern 316 to prevent the material from moving or even slipping from the charging area 315, and the air holes 317 are conducive to heat conduction. Preferably, the setter 31 is made of reaction-sintered silicon carbide, which has good high temperature resistance.

[0046] Furthermore, if Figure 4As shown, in this embodiment, a maintenance furnace door 25 is provided at the other end of the furnace shell 21, a feed channel 221 is provided at one end of the furnace 22, and a maintenance channel 222 is provided at the other end. The feed channel 221 is located between the inlet and outlet furnace door 23 and the firing tray 31. The inner side of the furnace 22 is provided with a spliced ​​arc surface 223 and a square surface 224. The arc surface 223 is arranged close to the feed channel 221. The firing tray 31 cooperates with the feed channel 221 through the arc surface 223. The surrounding side of the firing tray 31 is provided with a material blocking flange 31 having the same height as the feed channel 221. 8. The square surface 224 is arranged close to the inspection channel 222. An anti-stuck material structure 6 is also arranged between the furnace 22 and the firing tray 31. The anti-stuck material structure 6 includes a square material receiving groove 61 and a transition slope 62. The square material receiving groove 61 is located on the inner side of the square surface 224. The height of the square material receiving groove 61 is lower than the firing tray 31, and the width is greater than the feeding channel 221. The feeding channel 221 and the square material receiving groove 61 are respectively located on the opposite sides of the firing tray 31, and the transition slope 62 is located between the furnace 22, the firing tray 31 and the square material receiving groove 61. The inner side of the furnace 22 is in the shape of a front circle and a rear square, with a front side of an arc surface 223 and a rear side of a square surface 224. The sintering tray 31 is docked with the feed channel 221 through the arc surface 223, which is convenient for reducing the gap between the sintering tray 31 and the feed channel 221, facilitating docking and avoiding material jamming. The material blocking flange 318 on the side of the sintering tray 31 can block the heating residue from falling into the gap between the sintering tray 31 and the furnace 22; a square receiving groove is provided on the inner side of the square surface 224 61, the height of the square material receiving trough 61 is lower than the firing tray 31, and it is a sunken type. A transition slope 62 is provided between the furnace chamber 22, the firing tray 31 and the square material receiving trough 61. If the material accidentally slides off the firing tray 31 during rotation, it will fall from the transition slope 62 to the square material receiving trough 61 due to its own gravity and centrifugal force, and finally it can be taken out by opening the maintenance furnace door 25, which can avoid material jamming and affecting the rotation of the firing tray 31 and the heating of the material.

[0047] Preferably, servo motor current monitoring is added to timely monitor abnormal conditions of the firing tray 31; the maintenance furnace door 25 is in a normally closed state and is located at the rear of the furnace shell 21. The outer shell is made of carbon steel, and the door frame is a hollow structure with a joint for passing cooling water to cool the sealing surface and the sealing strip. The sealing method is to use a foamed silicone rubber sealing strip, and the sealing strip is compressed and sealed by a tightening hand wheel on the outer ring of the furnace door; the insulation material of the maintenance furnace door 25 is divided into two parts, one is a 1400 type customized polycrystalline mullite fiber module fixed on the furnace door shell, and the other is an inner movable insulation plug brick made of 1500 zirconium-containing fiber products. This structure can improve the insulation performance while reducing the corrosion of the furnace door fixed insulation material to increase the service life of the furnace door.

[0048] Furthermore, if Figure 5As shown, in this embodiment, the sealing mechanism 5 includes an annular oil seal chamber 51, a cooling water tank 52, a fixed oil seal knife 53 and a rotating oil seal knife 54. The annular oil seal chamber 51 is arranged in the cooling water tank 52, the fixed oil seal knife 53 and the rotating oil seal knife 54 are both located in the annular oil seal chamber 51, the fixed oil seal knife 53 is arranged at the bottom of the furnace shell 21, and the rotating oil seal knife 54 is arranged at the bottom of the turntable assembly 3. The cooling water tank 52 is connected to a water inlet 521 and a drain port 522 at the bottom, and is connected to a water outlet 523 at the top. A water level gauge 524 is also provided on the cooling water tank 52, and a refueling port 511 and an oil level gauge 512 are provided on the annular oil seal chamber 51. The fixed oil seal knife 53 is arranged at the bottom of the furnace shell 21 and is stationary. The rotating oil seal knife 54 is arranged at the bottom of the turntable assembly 3 and rotates with the turntable assembly 3. The fixed oil seal knife 53 and the rotating oil seal knife 54 are inserted into the sealing oil of the annular oil seal cavity 51 to dynamically seal the gap between the furnace shell 21 and the turntable assembly 3. The annular oil seal cavity 51 is provided with an oil level gauge 512. When refueling is needed, the sealing oil is replenished through the refueling port 511. The annular oil seal cavity 51 is a cooling water tank 52. Cooling water is passed into the interior to directly cool the oil. The cooling water tank 52 is also equipped with a water level gauge 524 to detect the liquid level of the cooling water tank 52. Preferably, the cooling water tank 52 is made of SUS304 stainless steel; the sealing oil is a high temperature resistant and low volatile lubricating oil; the rotating oil seal knife 54 is detachably connected to the turntable assembly 3, which is convenient for disassembly and replacement; the fixed oil seal knife 53 and the rotating oil seal knife 54 are both arc-shaped plates.

[0049] Further, in this embodiment, a temperature measuring component 7 is provided on the top of the furnace shell 21, and the temperature measuring component 7 includes a temperature control thermocouple 71 and a calibration thermocouple 72. The temperature control thermocouple 71 is parallel to the calibration thermocouple 72 and both are arranged vertically. The temperature control thermocouple 71 is electrically connected to the control module, and the control module is electrically connected to the heating component 24. The temperature control thermocouple 71 detects the temperature in the furnace and sends it to the control module. The control module controls the heating power of the heating component 24, so as to achieve the purpose of adjusting the heating temperature in the furnace. The temperature control thermocouple 71 is parallel to the calibration thermocouple 72 and both are arranged vertically, so that the temperature control thermocouple 71 can be calibrated by the calibration thermocouple 72 after the temperature control thermocouple 71 has been used for a period of time and has a deviation. Preferably, the temperature-controlling thermocouple 71 and the calibration thermocouple 72 are both platinum-rhodium S-graded thermocouples with Class I accuracy, covered with corundum protective sleeves, fixed to the furnace top cover flange, and vertically arranged in the middle of the furnace shell 21. The two temperature-controlling thermocouples 71 control the temperature in the furnace, and the one calibration thermocouple 72 performs over-temperature alarm and records sampling; the thermocouple position is set to be greater than 300mm away from the furnace door, and the thermocouple is fixed by a compression sleeve structure of a nut to tighten the sealing ring and keep the cold end greater than 500mm away from the furnace shell 21 to reduce the influence of the furnace temperature on the wiring terminal. At the same time, the upper and lower distances of the thermocouple are adjustable; an independent over-temperature alarm is used for control to monitor the temperature of the kiln cavity. The temperature adopts a dot-type hybrid paper recorder, which can display digitally, alarm and print at multiple points at the same time, has better compatibility, simple internal data communication, and low error rate. It is particularly suitable for the continuous working state of this rotary heating furnace, and the temperature curve of the heated workpiece can be traced and saved as process data evidence.

[0050] Further preferably, it also includes a temperature controller and a power regulator. The closed-loop control system of the temperature control system is composed of a heating component 24, a temperature measuring component 7, a temperature controller and a power regulator, and continuous PID adjustment is performed. The heating element is a silicon carbon rod, and a transformer is used to isolate the heating element. There are 2 groups of isolation transformers with isolation covers placed in the lower part of the furnace shell 21 and connected to the frame 1 as a whole. The capacity of a single unit is selected to be 50kVA, and the efficiency is ≥95% to ensure the quality of the power grid. The secondary floating ground is connected to the heating element; the temperature controller uses a full-scale input digital indication temperature control regulator, and the control power regulator (hereinafter referred to as SCR) implements PID "switch position" adjustment. The temperature controller is installed in a temperature control cabinet with a cabinet air conditioner to ensure its normal working temperature; SCR uses a three-phase thyristor power regulator, an integrated structural module, and a built-in adjustment switch. The regulator uses a constant current mode to adjust the power of the heating element and PID regulation.

[0051] Furthermore, in this embodiment, a photoelectric sensor is provided on the frame 1, a reflector is provided at the bottom of the turntable assembly 3, a zero position mark is provided on the reflector, and the photoelectric sensor faces the reflector. The zero position of the turntable assembly 3 can be limited and calibrated, which is convenient for identifying and controlling the rotation angle of the turntable assembly 3. It should be noted that the photoelectric sensor and the reflector are not shown.

[0052] Furthermore, in this embodiment, a material storage platform 26 is provided outside the inlet and outlet furnace door 23, and a detection mechanism 27 is provided on the furnace shell 21, and the detection mechanism 27 is used to detect the movement state of the inlet and outlet furnace door 23 and the storage state of the material storage platform 26. The material storage platform 26 can temporarily place materials and at the same time play an isolating and protective role for the dangerous area of ​​the furnace door.

[0053] Preferably, if Figure 6 As shown, the rotary drive mechanism 4 includes a support frame 41, a hollow rotating table 42, a planetary reducer 43 and a servo motor 44. The hollow rotating table 42, the planetary reducer 43 and the servo motor 44 are connected in sequence to form a main body. There are mounting holes on the table top of the hollow rotating table 42, and the turntable 34 can be fixed by bolt connection. The turntable 34 and the hollow rotating table 42 are connected by a rigid coupling sleeve. There are reinforcing ribs around the sleeve to increase the structural strength of the turntable 34 and prevent the turntable 34 from swinging when the loading is uneven.

[0054] Preferably, the hollow turntable 42 is a heavy-duty hollow turntable with a reduction ratio of 1:24 and a maximum load of 1200kgf. It adopts a roller transmission structure, and the driving cam and the needle bearing are pre-loaded to achieve gapless rolling transmission without sliding friction, and the gapless characteristic is continuously maintained. The forward and reverse motion repetition accuracy is high, and it has high rigidity and heavy-load characteristics. The other end of the input shaft of the hollow turntable 42 is equipped with an extended handwheel, which can be manually rotated when the power is off. The servo motor 44 uses a 3.5kW rated power and a rated speed of 2000r / min servo. The AC motor is equipped with an angle encoder to display the rotation angle and output the indexing signal, ensuring that the turntable 34 rotates smoothly and stops reliably; the hollow turntable 42 and the inlet and outlet furnace door 23 are provided with a linkage function and a zero return function, and the hollow turntable 42 can be set to rotate with stepless speed regulation or intermittent indexing rotation; a separate cooling fan 45 is installed on the side of the servo motor 44 to directly dissipate the heat of the motor to ensure the normal working temperature of the motor; the bottom of the support frame 41 can be adjusted in height, which is convenient for disassembly and debugging, and positioning plates are provided around the support frame 41 for fixed limit.

[0055] Preferably, the high-temperature rotary heating furnace also includes a monitoring system. The detection system is composed of a touch screen and a programmable controller (hereinafter referred to as PLC). The touch screen interface is divided into the display and storage of operating status, operating data, system parameters, and alarm information to realize human-computer dialogue. It can complete the display of sintering curves (including temperature curves of each temperature zone at the same time and temperature curves of the same temperature zone at different times), the collection, monitoring, storage and recording of process data. It is equipped with a USB interface to output the saved data. It has a DCS communication interface to transmit temperature data. The operating data can display the operating status of the heating system, etc., including displaying the material level setting, the current number of material positions, the rotating table speed, and the servo motor speed. The status of the servo motor, alarm information, temperature and other information are displayed. The parameter modification interface can modify parameters such as the speed and temperature settings of each temperature zone. Data transmission can introduce control system information into the central control room, and a monitoring access port is reserved; the touch screen will automatically save information such as temperature, inverter frequency, turntable position, etc. at a fixed time, and can be queried; the control cabinet is equipped with standard automation integration options, providing standard automation interfaces, including robot action signal interfaces, which can be connected to external loading and unloading robots to realize automatic control of loading, heating, and unloading, and integrate into the process chain; all electrical control systems are installed in the electrical box of furnace body 2 and can operate with furnace body 2 as a whole.

[0056] Preferably, the high-temperature rotary heating furnace also has protection and alarm functions, including furnace temperature abnormal protection, thermocouple abnormal alarm, turntable abnormal alarm, leakage protection, over-voltage and under-voltage protection, electrical appliance overheat protection, mechanical component protection, cooling water abnormal alarm and anti-jamming protection. The furnace temperature abnormal protection is that when the furnace temperature detected by the temperature measuring point exceeds the set maximum temperature, the heating will stop automatically. When the deviation is too large, an alarm will be prompted. When the thermocouple is abnormal, an alarm will be prompted and the cause code will be displayed. When the turntable fails, an alarm will be prompted and an alarm will be sounded. If leakage occurs or the voltage suddenly changes, the power supply can be intelligently and automatically cut off quickly in case of overvoltage, overvoltage and undervoltage. The electrical appliance overheat protection function is specifically that the transformer electrical box is equipped with temperature detection and fan heat dissipation, and the temperature controller electrical box is equipped with cabinet air conditioning cooling. When overheating, the cooling temperature can be automatically adjusted for protection. Protective mesh covers are installed all around the bottom of the frame 1 to protect the moving parts area. The annular oil seal cavity 51 and the cooling water tank 52 are respectively provided with an oil level gauge 512 and a water level gauge 524, with a water level alarm function.

[0057] Preferably, when it is necessary to perform pre-forging heat treatment on multiple batches of workpieces, first set the process status on the touch screen, including temperature curve, process gas flow rate, rotation speed, etc. If the material is fed in a hot state, it will be started directly after the setting is completed. When the rotary heating furnace is heated to the target temperature, select the material level to be used on the touch screen, step on the foot switch 9, and the firing tray 31 automatically rotates the loading area 315 to the direction of the inlet and outlet furnace door 23. Use a high-temperature resistant clamp to clamp the workpieces and place them in the loading area 315 in sequence. When the batch of workpieces is placed, the next batch of workpieces needs to be placed. After selecting the new material level on the touch screen for confirmation, the firing tray 31 rotates to the new loading area 315, and continues to discharge the material. Repeat the above operations until all workpieces are placed in the corresponding loading area 315, step on the foot switch 9. The door pedal is lowered, the furnace door is closed, and the workpiece is subjected to a heat treatment process in the furnace while being heated while rotating with the loading area 315. When the heating is completed, if the material is to be discharged in a hot state, the loading area 315 to be discharged is set on the touch screen. After confirmation, when the door opening switch is stepped on, the firing plate 31 rotates to the position of the loading area 315 facing the front door, and the furnace door is opened at the same time. The personnel use the clamp to take the workpiece out of the furnace in turn, and the workpiece can be sent to the next forging process, etc. At the same time, the empty material position can also be used for the next batch of workpieces for heating treatment. The above operations can complete the continuous pre-forging heating treatment process for multiple batches of workpieces. The equipment has reserved automation and signal interfaces, which can realize the signal transmission and control of the automatic line master control and the rotary heating furnace, and realize the robot to replace manual labor to complete the loading and unloading operations, thereby greatly improving production efficiency.

[0058] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A high temperature rotary heating furnace, characterized in that: The invention comprises a frame (1) and a furnace body (2), wherein the furnace body (2) comprises a furnace shell (21), a furnace chamber (22) and a furnace inlet and outlet door (23), wherein the furnace shell (21) is arranged on the frame (1), the furnace chamber (22) is arranged in the furnace shell (21), the furnace inlet and outlet door (23) is arranged at one end of the furnace shell (21) and is connected to an opening and closing door mechanism (8), a heating component (24) is arranged on the top of the furnace shell (21), a turntable component (3) and a rotation driving mechanism (4) for driving the turntable component (3) to rotate are also arranged on the frame (1), the turntable component (3) passes through the furnace shell (21) and is located in the furnace chamber (22), and a sealing mechanism (5) is arranged between the turntable component (3) and the furnace chamber (22).

2. The high temperature rotary heating furnace according to claim 1, characterized in that: The turntable assembly (3) comprises a firing tray (31), a mounting seat (32), a heat-insulating layer (33) and a turntable (34); the turntable (34) is connected to a rotary drive mechanism (4); the heat-insulating layer (33) is arranged on the turntable (34); and the firing tray (31) is mounted on the heat-insulating layer (33) via the mounting seat (32).

3. The high temperature rotary heating furnace according to claim 2, characterized in that: The mounting seat (32) comprises a clamping disc (321) and a clamping tube (322); the clamping disc (321) is embedded in the thermal insulation layer (33); the clamping disc (321) is provided with a clamping groove (323); the clamping tube (322) is arranged in the middle of the clamping groove (323); a clamping block (311) is provided at the bottom of the firing tray (31) and a positioning hole (312) is provided in the middle; the clamping block (311) is clamped in the clamping groove (323); and the positioning hole (312) is sleeved outside the clamping tube (322).

4. The high temperature rotary heating furnace according to claim 3, characterized in that: A plurality of support columns (313) are provided at the bottom of the support plate (31), and the plurality of support columns (313) are arranged at intervals along the circumference of the support plate (31). The support columns (313) are supported in the thermal insulation layer (33), and a cushion block (314) is provided at the bottom.

5. The high temperature rotary heating furnace according to claim 2, characterized in that: The firing tray (31) is provided with a plurality of charging areas (315), the plurality of charging areas (315) are arranged at intervals along the circumference of the firing tray (31), and the charging areas (315) are provided with anti-slip patterns (316) and air holes (317).

6. The high temperature rotary heating furnace according to claim 5, characterized in that: The other end of the furnace shell (21) is provided with an inspection furnace door (25); one end of the furnace chamber (22) is provided with a feed channel (221), and the other end is provided with an inspection channel (222); the feed channel (221) is located between the feed and discharge furnace door (23) and the firing tray (31); the inner side of the furnace chamber (22) is provided with a spliced ​​arc surface (223) and a square surface (224); the arc surface (223) is arranged close to the feed channel (221); the firing tray (31) is docked with the feed channel (221) through the arc surface (223); a material blocking flange (318) having the same height as the feed channel (221) is provided on the circumference of the firing tray (31); the square surface (224) is provided on the inner side of the furnace chamber (22); The surface (224) is arranged close to the maintenance passage (222), and an anti-stuck material structure (6) is also arranged between the furnace (22) and the firing tray (31), and the anti-stuck material structure (6) comprises a square material receiving groove (61) and a transition slope (62), the square material receiving groove (61) is located on the inner side of the square surface (224), the height of the square material receiving groove (61) is lower than the firing tray (31), and the width is greater than the feeding channel (221), the feeding channel (221) and the square material receiving groove (61) are respectively located on opposite sides of the firing tray (31), and the transition slope (62) is located between the furnace (22), the firing tray (31) and the square material receiving groove (61).

7. The high temperature rotary heating furnace according to any one of claims 1 to 6, characterized in that: The sealing mechanism (5) comprises an annular oil seal chamber (51), a cooling water tank (52), a fixed oil seal knife (53) and a rotating oil seal knife (54); the annular oil seal chamber (51) is arranged in the cooling water tank (52); the fixed oil seal knife (53) and the rotating oil seal knife (54) are both located in the annular oil seal chamber (51); the fixed oil seal knife (53) is arranged at the bottom of the furnace shell (21); the rotating oil seal knife (54) is arranged at the bottom of the turntable assembly (3); the cooling water tank (52) is connected to a water inlet (521) and a water outlet (522) at the bottom, and is connected to a water outlet (523) at the top; a water level gauge (524) is also provided on the cooling water tank (52); and an oil filling port (511) and an oil level gauge (512) are provided on the annular oil seal chamber (51).

8. The high temperature rotary heating furnace according to any one of claims 1 to 6, characterized in that: A temperature measuring component (7) is provided on the top of the furnace shell (21), and the temperature measuring component (7) comprises a temperature control thermocouple (71) and a calibration thermocouple (72). The temperature control thermocouple (71) and the calibration thermocouple (72) are parallel and arranged vertically. The temperature control thermocouple (71) is electrically connected to a control module, and the control module is electrically connected to a heating component (24).

9. The high temperature rotary heating furnace according to any one of claims 1 to 6, characterized in that: The frame (1) is provided with a photoelectric sensor, the bottom of the turntable assembly (3) is provided with a reflective plate, a zero position mark is provided on the reflective plate, and the photoelectric sensor faces the reflective plate.

10. The high temperature rotary heating furnace according to any one of claims 1 to 6, characterized in that: A material storage platform (26) is provided outside the inlet and outlet furnace door (23), and a detection mechanism (27) is provided on the furnace shell (21). The detection mechanism (27) is used to detect the movement state of the inlet and outlet furnace door (23) and the material storage state of the material storage platform (26).

Images