Dewaxing and filtering device for precision investment casting and operation method of dewaxing and filtering device

Abstract

The invention belongs to the technical field of investment precision casting dewaxing, and particularly discloses a investment precision casting dewaxing filtering device and an operation method thereof.The investment precision casting dewaxing filtering device comprises a base, a supporting frame is fixedly connected to the top of the base, a dewaxing box is fixedly connected to the top of the supporting frame, and electric heating modules are arranged on the two sides in the dewaxing box; according to the technical scheme, through cooperative operation of core designs such as top dewaxing, precise filtering and convenient opening and closing, the comprehensive effects of thorough dewaxing, efficient wax liquid recycling and convenient equipment operation and maintenance are achieved, the dewaxing efficiency is improved, and the dewaxing efficiency is improved. The problems that in the prior art, dewaxing is not thorough, wax liquid is difficult to recycle, impurities are too many, and equipment is tedious to use and maintain are comprehensively solved, the overall process of the investment precision casting dewaxing procedure is remarkably optimized, and the stability, economical efficiency and practicability of the procedure are improved.

Description

Technical Field

[0001] This invention relates to the field of investment casting dewaxing technology, and in particular to an investment casting dewaxing and filtering device and its operation method. Background Technology

[0002] Investment casting, also known as lost-wax casting, is a precision casting process suitable for producing small parts (such as turbine engine blades) with complex shapes, high precision requirements, or those that are difficult to form by other processing methods. Its core process includes wax pressing, wax repair, tree assembly, slurry application, wax melting, pouring molten metal, and post-processing. The process involves making a wax model of the part using a wax-based material, coating the surface of the wax model with slurry to form a clay model, drying and firing it to make a ceramic model. During the firing process, the wax model completely melts and flows away, leaving only the ceramic model with the cavity. Finally, molten metal is poured in through a pre-set pouring port, and after cooling, the desired part is obtained. After the shell is completely hardened, the inner wax-based mold assembly needs to be melted away. Due to the characteristics of the mold assembly material, this process is called dewaxing, and the dewaxing effect directly affects the forming quality of the subsequent casting. Traditional dewaxing equipment has significant limitations in practical applications: on the one hand, wax residue often occurs during the dewaxing process, resulting in incomplete dewaxing of the wax mold inside the shell, requiring additional manual labor for secondary inspection and manual dewaxing, which not only increases labor costs but also reduces production efficiency; on the other hand, existing equipment lacks an efficient mechanism for collecting wax after dewaxing, resulting in a large amount of wax being lost with the waste material, causing raw material waste and further increasing production costs. To improve these problems, targeted improvement devices have emerged in related technical fields. For example, Chinese patent with publication number "CN108655343B" discloses a dewaxing machine for investment casting mold shells. This device uses a heater to achieve water boiling dewaxing through the cooperation of the outer and inner boxes, separates impurities with a filter screen, and discharges water through a drainage component. It is also equipped with a dryer and a temperature control device to ensure the dewaxing effect, which reduces manual intervention and raw material loss to a certain extent. However, the aforementioned improved device still has key technical defects: its core relies on direct drainage after dewaxing by boiling in water to separate the wax from the mold shell. However, the density of the melted wax-based material is significantly less than that of water, so the wax will naturally float on the water surface. When the drainage component is activated to discharge the water, the floating wax will fall with the water flow and re-adhere to the surface of the mold base and the mold shell to be dewaxed. During the subsequent drying process, the adhered wax will solidify and remain, resulting in incomplete dewaxing and requiring additional treatment. In essence, the device does not have a wax separation and filtration structure at the top of the liquid level designed for the floating characteristics of the wax, and cannot achieve effective separation of wax and water during the dewaxing stage. It is difficult to fundamentally solve the problem of wax residue and recycling, and the existing technology still needs further improvement. Summary of the Invention

[0003] The purpose of this invention is to provide a dewaxing and filtering device for investment casting and its operation method, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides a dewaxing and filtering device for investment casting, comprising a base, a support frame fixedly connected to the top of the base, a dewaxing chamber fixedly connected to the top of the support frame, electric heating modules on both sides of the dewaxing chamber, a steam exhaust mechanism on the top of the dewaxing chamber, a water inlet pipe fixedly installed on the upper side of one side of the dewaxing chamber, a controller fixedly installed on the upper side of the dewaxing chamber near the water inlet pipe, a pushing mechanism fixedly installed on the upper front side of the dewaxing chamber, a filtering mechanism fixedly installed on the side of the dewaxing chamber away from the water inlet pipe, and a dewaxing discharge hopper fixedly installed on the upper side of the dewaxing chamber near the filtering mechanism, with the output end of the dewaxing discharge hopper positioned above the filtering mechanism. The feeding mechanism includes a guide rail, which is fixedly installed on the upper front of the dewaxing chamber. A first motor is fixedly installed at one end of the guide rail. A lead screw is rotatably connected inside the guide rail. A slider is threadedly connected to the outer surface of the lead screw. The slider is slidably connected inside the guide rail. A scraping module is fixedly connected to the side of the slider near the inside of the dewaxing chamber. The output end of the first motor is connected to the end of the lead screw through a coupling. The bottom of the scraping module is in contact with the water surface inside the dewaxing chamber.

[0005] Furthermore, the electric heating module includes a tank, which is opened on both sides of the dewaxing chamber, and electric heating tubes are fixedly connected inside the tank in a linear arrangement at equal intervals.

[0006] Furthermore, the scraping module includes a connecting arm, which is fixedly connected to the outside of the slider. A fixing plate is fixedly connected to the bottom end of the connecting arm, a wax pusher is fixedly connected to the bottom of the fixing plate, and a liquid level sensor is fixedly connected to one end of the fixing plate.

[0007] Furthermore, the steam emission mechanism includes a circular plate, which is fixedly connected to one end of the back of the dewaxing chamber. An electric push rod is fixedly connected to the middle of the circular plate, and a connecting rod is fixedly connected to the top of the electric push rod. A cover plate is fixedly connected to the top of the connecting rod, and the cover plate covers the top of the dewaxing chamber. An exhaust assembly is fixedly installed on the top of the cover plate.

[0008] Furthermore, a temperature sensor is fixedly installed on one side of the top of the cover plate. When the electric push rod is retracted, the detection end of the temperature sensor is in contact with the water in the dewaxing chamber. The input end of the exhaust assembly passes through the cover plate and is connected to the dewaxing chamber. When the exhaust assembly is running, it can quickly draw out the steam and prevent it from being discharged through the dewaxing discharge hopper.

[0009] Furthermore, the exhaust assembly includes a steam exhaust hopper, which is fixedly connected to the top of the cover plate. A centrifugal steam induced draft fan is fixedly connected to the output end of the steam exhaust hopper. A steam exhaust pipe is fixedly installed at the output end of the centrifugal steam induced draft fan. An external steam exhaust pipe connection flange is fixedly installed at the outer end of the steam exhaust pipe.

[0010] Furthermore, the filtration mechanism includes a mounting frame, which is fixedly installed on the lower side of the dewaxing chamber. A filter box is fixedly installed on the top of the mounting frame. A filter module is movably installed inside the filter box. A drain pipe is fixedly installed on one side of the filter box. The inlet end of the drain pipe is connected to the inside of the filter box. An external drain pipe connection flange is fixedly connected to the outside of the drain pipe. An inlet flange is fixedly installed at the inlet end of the water inlet pipe. The filter box is located directly below the dewaxing discharge hopper.

[0011] Furthermore, the filter module includes a top frame and insertion holes. Support plates are fixedly connected to the four corners of the top frame, and mounting pins are fixedly connected to the bottom of the support plates. The insertion holes are opened at the four corners of the top of the filter box, and the bottom of the mounting pins is inserted into the insertion holes. Filter screens are fixedly connected to both sides inside the top frame, and discharge components are fixedly connected to the lower inner side of the filter screens.

[0012] Furthermore, the discharge assembly includes an arc-shaped filter screen, which is fixedly connected to the bottom of the filter screen. The two filter screens are arranged in an outward V-shape and open upwards. A cleaning auger is rotatably connected to the inner side of the arc-shaped filter screen. A second motor is fixedly installed on one side of the arc-shaped filter screen. The output end of the second motor is connected to the cleaning auger through a coupling. A discharge pipe is fixedly connected to the output end of the arc-shaped filter screen away from the second motor. A discharge valve is fixedly installed at the bottom output end of the discharge pipe. A disassembly and assembly reserved slot is opened on the side of the filter box near the discharge pipe. The discharge pipe moves inside the disassembly and assembly reserved slot.

[0013] A method for dewaxing and filtering in investment casting includes the following steps: Step 1: Inject a fixed amount of water into the dewaxing chamber through the water inlet pipe. Use the regulating valve at the water inlet pipe to control the water injection volume and ensure that the water level covers the dewaxing discharge hopper. During the dewaxing process, continuously replenish water through the regulating valve to maintain this water level. After the water inlet is completed, adjust the on / off state of the water inlet pipe according to the liquid level. Step 2: Place the shell to be dewaxed on the internal support structure of the dewaxing chamber, start the controller, and the controller controls the operation of the electric heating module. The electric heating tube is energized to heat the water to the preset dewaxing temperature. Step 3: During the heating process, the controller controls the operation of the steam exhaust mechanism. The electric push rod retracts, causing the cover plate to move down and cover the top of the dewaxing chamber. At the same time, the centrifugal steam blower is started, drawing steam through the steam exhaust hopper and discharging it through the steam exhaust pipe and the external steam exhaust pipe connecting flange. The temperature sensor detects the water temperature in real time and transmits the data to the controller. The controller adjusts the heating power of the electric heating tube according to the data. Step 4: After the dewaxing time reaches the preset time, the controller starts the feeding mechanism. The first motor drives the lead screw to rotate, and the slider slides along the guide rail, which drives the connecting arm, the fixed plate and the wax push plate to move, pushing the floating wax liquid to the dewaxing discharge hopper. The liquid level sensor monitors the liquid level in real time and transmits the data to the controller. The controller adjusts the water replenishment frequency and water replenishment amount through the regulating valve. Step 5: The wax liquid falls into the filter box through the dewaxing discharge hopper. The mixture first passes through the filter screen to filter impurities, and then flows to the arc-shaped filter screen. The controller controls the second motor to drive the cleaning auger to rotate, which transports the wax liquid in the arc-shaped filter screen to the discharge pipe. The discharge valve is opened to discharge the wax liquid for collection. The filtered water liquid is discharged through the drain pipe and the external drain pipe connecting flange. Step 6: After dewaxing is complete, the electric push rod extends and moves the cover plate up to open the top of the dewaxing chamber, and the dewaxed shell is removed. When the filter module needs to be cleaned or replaced, the discharge pipe is removed by disassembling the reserved slot, the top frame is lifted to disengage the mounting pin from the socket, and the filter module is removed. After cleaning or replacement, the mounting pin is inserted into the socket to reset the filter module.

[0014] Compared with the prior art, the beneficial effects of the present invention are: Firstly, in this invention, during the application of this technical solution, by setting up a pushing mechanism, a dewaxing hopper, and a water level control structure, it is possible to specifically utilize the characteristic that the density of wax is less than that of water during use. The melted and floating wax is directionally processed from the top of the water surface. The pushing mechanism drives the wax pusher plate to move smoothly, concentrating and pushing the wax on the water surface to the dewaxing hopper. At the same time, water is continuously replenished through the regulating valve to always maintain the water level above the dewaxing hopper, ensuring that the wax can be smoothly discharged from the top. This completely avoids the situation where the wax falls with the water flow caused by the traditional drainage method, thereby achieving the effect of complete separation of the wax from the mold shell and the supporting structure. This solves the problem of incomplete dewaxing caused by the wax re-adhering to the mold shell and the supporting structure in the prior art, leaving no wax residue inside and on the surface of the mold shell, providing a good foundation for subsequent casting processes. Secondly, in this invention, during the application of this technical solution, by setting up a filtration mechanism and a matching wax collection component, the wax discharged from the top can be efficiently filtered and purified during use. After the wax falls into the filtration mechanism through the dewaxing hopper, it first passes through the filter screen to intercept impurities such as shell fragments, and then passes through the arc-shaped filter screen to collect the wax and separate the water. During the collection process, the filtration effect is maintained, and the water residue is avoided from affecting the purity of the wax. At the same time, the filter module adopts a detachable design, and the filter module can be taken out as a whole for cleaning or replacement with simple operation, without complicated disassembly process. Thus, the effect of accurate filtration of wax and improved recycling rate is achieved, which solves the problems of excessive impurities, water residue and inconvenient cleaning of filter components during wax recycling in the prior art, so that the recycled wax can be directly reused. Thirdly, in this invention, during the application of this technical solution, the steam emission mechanism and convenient opening and closing structure allow for flexible control of the opening and closing states of the dewaxing chamber and the filter chamber during use. During the dewaxing process, the electric push rod drives the cover plate to tightly cover the top of the dewaxing chamber, and the steam emission mechanism quickly discharges steam, preventing steam leakage and waste caused by carrying wax liquid. After dewaxing is completed, the electric push rod can be extended to open the top of the dewaxing chamber, making it easy to quickly remove the dewaxed mold shell. The filter chamber is designed with a pre-reserved slot for easy removal of the discharge pipe and filter module, reducing the difficulty of equipment maintenance and cleaning. This achieves the effect of convenient equipment operation and efficient maintenance, solving the problems of inconvenient opening and closing of the dewaxing chamber and cumbersome cleaning of the filter chamber in the prior art, which leads to limited production efficiency, and significantly reducing the time cost of equipment operation and maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the rear view structure in this invention; Figure 3 This is a schematic diagram of the steam emission mechanism in this invention; Figure 4 This is a schematic diagram of the internal structure of the dewaxing box in this invention; Figure 5 This is a schematic diagram of the filtration mechanism in this invention; Figure 6 This is a top view of the filter mechanism in its disassembled state in this invention. Figure 7 This is a top-view structural diagram of the filter mechanism in its disassembled state in this invention; Figure 8 This is a schematic diagram of the scraping module structure in this invention.

[0016] In the diagram: 1. Base; 2. Support frame; 3. Steam exhaust mechanism; 31. Circular plate; 32. Electric push rod; 33. Connecting rod; 34. Cover plate; 35. Exhaust assembly; 351. Steam exhaust hopper; 352. Centrifugal steam draft fan; 353. Steam exhaust pipe; 36. Temperature sensor; 4. Dewaxing chamber; 5. Water inlet pipe; 6. Electric heating module; 61. Tank; 62. Electric heating tube; 7. Controller; 8. Pushing mechanism; 81. Guide rail; 82. First motor; 83. Lead screw; 84. Slider; 85. Scraper module; 851 852. Connecting arm; 853. Fixing plate; 854. Wax pusher plate; 855. Liquid level sensor; 9. Filtering mechanism; 91. Mounting frame; 92. Filter box; 93. Filter module; 931. Top frame; 932. Insertion hole; 933. Support plate; 934. Mounting pin; 935. Filter screen; 936. Discharge assembly; 9361. Arc-shaped filter screen; 9362. Cleaning auger; 9363. Second motor; 9364. Discharge pipe; 9365. Discharge valve; 9366. Disassembly and assembly reserved slot; 94. Drain pipe; 10. Dewaxing discharge hopper. Detailed Implementation

[0017] Example Please see Figures 1-8 In this embodiment of the invention, a dewaxing and filtering device for precision casting includes a base 1, a support frame 2 fixedly connected to the top of the base 1, a dewaxing chamber 4 fixedly connected to the top of the support frame 2, electric heating modules 6 on both sides inside the dewaxing chamber 4, a steam exhaust mechanism 3 on the top of the dewaxing chamber 4, a water inlet pipe 5 fixedly installed on the upper side of one side of the dewaxing chamber 4, a controller 7 fixedly installed on the upper side of the dewaxing chamber 4 near the water inlet pipe 5, a pushing mechanism 8 fixedly installed on the upper front side inside the dewaxing chamber 4, a filtering mechanism 9 fixedly installed on the side of the dewaxing chamber 4 away from the water inlet pipe 5, and a dewaxing discharge hopper 10 fixedly installed on the upper side of the dewaxing chamber 4 near the filtering mechanism 9. The output end of the dewaxing discharge hopper 10 is located above the filtering mechanism 9. The feeding mechanism 8 includes a guide rail 81, which is fixedly installed on the upper front of the dewaxing chamber 4. A first motor 82 is fixedly installed at one end of the guide rail 81. A lead screw 83 is rotatably connected inside the guide rail 81. A slider 84 is threadedly connected to the outer surface of the lead screw 83. The slider 84 is slidably connected inside the guide rail 81. A scraping module 85 is fixedly connected to the side of the slider 84 closest to the inside of the dewaxing chamber 4. The output end of the first motor 82 is connected to the end of the lead screw 83 via a coupling. During the application of this device, it is adjusted by setting... The support frame 2 on top of the base 1 provides stable support for the dewaxing chamber 4. Together with the electric heating modules 6 on both sides inside the dewaxing chamber 4, the steam exhaust mechanism 3 on top, the water inlet pipe 5 on one side and the controller 7, the internal pushing mechanism 8, the filter mechanism 9 on the other side, and the dewaxing discharge hopper 10, it allows for the following process: First, a suitable amount of water is injected into the dewaxing chamber 4 through the water inlet pipe 5. After placing the mold shell to be dewaxed into the dewaxing chamber 4, the electric heating module 6 is activated via the controller 7. The electric heating module 6 generates heat to heat the water, causing the mold shell to dewax. As the wax model inside the shell gradually melts, the melted wax, being less dense than water, floats on the surface. At this point, the controller 7 activates the pushing mechanism 8, and the first motor 82 drives the lead screw 83 to rotate. The lead screw 83 engages with the slider 84, causing the slider 84 to slide along the guide rail 81. The slider 84 drives the scraping module 85 to move synchronously. The scraping module 85 pushes the wax floating on the surface, pushing it to the dewaxing discharge hopper 10. The wax then falls through the output end of the dewaxing discharge hopper 10 into the filter mechanism 9 below for filtration. The steam generated during heating is discharged through the steam emission mechanism 3, preventing steam from accumulating inside the dewaxing chamber 4 and affecting the dewaxing effect. Throughout the process, the controller 7 coordinates the operation of all mechanisms without complex manual intervention. This ensures that the wax model melts completely and achieves directional delivery and filtration of the wax, effectively improving dewaxing efficiency, reducing wax waste, and ensuring the cleanliness of the shell after dewaxing. This provides a good foundation for subsequent casting processes and solves the problems of cumbersome operation, incomplete dewaxing, and difficulty in wax recovery in traditional dewaxing methods.

[0018] Please see Figures 1-4 and Figure 8, the electric heating module 6 includes a tank body 61 which is provided on both sides inside the dewaxing box body 4. Electric heating tubes 62 are fixedly connected in a linear arrangement at equal intervals inside the tank body 61. The scraping module 85 includes a connecting arm 851 which is fixedly connected to the outside of the slider 84. A fixed plate 852 is fixedly connected to the bottom end of the connecting arm 851. A wax liquid pushing plate 853 is fixedly connected to the bottom of the fixed plate 852. A liquid level sensor 854 is fixedly connected to one end of the fixed plate 852. During the application of this device, by setting the electric heating tubes 62 in the tank bodies 61 on both sides inside the dewaxing box body 4 and the connecting arm 851, fixed plate 852, wax liquid pushing plate 853 and liquid level sensor 854 that are supporting the material pushing mechanism 8, when in use, an appropriate amount of water can be first injected into the dewaxing box body 4 and the shell to be dewaxed can be placed in it. After starting the equipment, the electric heating tubes 62 are powered on to generate heat, uniformly heating the water to the temperature required for the wax mold to melt, ensuring that the wax mold inside the shell can be fully melted. The melted wax liquid floats on the water surface. The liquid level sensor 854 monitors the water level in real time, providing an accurate reference for the subsequent wax liquid pushing, avoiding affecting the pushing effect due to liquid level fluctuations. Subsequently, the material pushing mechanism 8 operates, driving the connecting arm 851 and the fixed plate 852 to move. The wax liquid pushing plate 853 at the bottom of the fixed plate 852 moves synchronously therewith, smoothly pushing the floating wax liquid to a specified position along the water surface, realizing the separation of the wax liquid from the shell. During the whole process, the design of the electric heating tubes 62 arranged linearly at equal intervals ensures uniform heating of the water, making the wax mold melt more thoroughly. The real-time monitoring of the liquid level sensor 854 and the directional pushing of the wax liquid pushing plate 853 ensure the high efficiency of the wax liquid separation, reducing manual intervention, avoiding the problem of incomplete dewaxing caused by wax liquid residue, improving the recycling rate of the wax liquid at the same time, reducing raw material waste, and making the dewaxing process smoother and more efficient.

[0019] Please refer to Figures 1-3The steam emission mechanism 3 includes a circular plate 31, which is fixedly connected to one end of the back of the dewaxing chamber 4. An electric push rod 32 is fixedly connected to the middle of the circular plate 31. A connecting rod 33 is fixedly connected to the top of the electric push rod 32. A cover plate 34 is fixedly connected to the top of the connecting rod 33. The cover plate 34 covers the top of the dewaxing chamber 4. An exhaust assembly 35 is fixedly installed on the top of the cover plate 34. A temperature sensor 36 is fixedly installed on one side of the top of the cover plate 34. When the electric push rod 32 is retracted, the detection end of the temperature sensor 36 is in contact with the water inside the dewaxing chamber 4. The input end of the exhaust assembly 35 passes through the cover plate 34 and is connected to the inside of the dewaxing chamber 4. The ventilation assembly 35 includes a steam exhaust hopper 351, which is fixedly connected to the top of the cover plate 34. A centrifugal steam draft fan 352 is fixedly connected to the output end of the steam exhaust hopper 351. A steam exhaust pipe 353 is fixedly installed at the output end of the centrifugal steam draft fan 352. An external steam exhaust pipe connecting flange is fixedly installed at the outer end of the steam exhaust pipe 353. During the application of this device, by setting up a circular plate 31 on the back of the dewaxing chamber 4, an electric push rod 32, a connecting rod 33, a cover plate 34, the ventilation assembly 35, and a temperature sensor 36 on the cover plate 34, it is possible to first retract the electric push rod 32 during use. The connecting rod 33 and the cover plate 34 move down, allowing the cover plate 34 to tightly cover the top of the dewaxing chamber 4. At this time, the detection end of the temperature sensor 36 comes into contact with the water liquid inside the dewaxing chamber 4, monitoring the water liquid temperature in real time and providing accurate data support for temperature control during the dewaxing process. When steam is generated inside the dewaxing chamber 4, the exhaust assembly 35 starts operating, and the centrifugal steam blower 352 starts to generate suction, drawing the steam inside the dewaxing chamber 4 through the steam exhaust hopper 351. The steam is discharged to the designated location through the steam exhaust pipe 353 and the external steam exhaust pipe connecting flange, preventing steam from accumulating inside the chamber and affecting the dewaxing environment. During the dewaxing process, the temperature sensor 36... 6. Continuous temperature data feedback allows for adjustments to the heating intensity based on actual conditions, ensuring the water solution remains at a suitable dewaxing temperature. The sealing effect of the cover plate 34, combined with the powerful suction of the centrifugal steam blower 352, prevents steam leakage that could cause a humid working environment and avoids the loss of wax carried by the steam, ensuring the stability and safety of the dewaxing process. The coordinated operation of steam emission and temperature monitoring makes the dewaxing environment easier to control, improving dewaxing efficiency and reducing wax waste and environmental impact. At the same time, the accurate monitoring of the temperature sensor 36 can also prevent incomplete dewaxing caused by excessively high or low temperatures, making the dewaxing process more reliable and efficient.

[0020] Please see Figures 3-7The filtration mechanism 9 includes a mounting frame 91, which is fixedly installed on the lower side of the dewaxing chamber 4. A filter chamber 92 is fixedly installed on the top of the mounting frame 91. A filter module 93 is movably installed inside the filter chamber 92. A drain pipe 94 is fixedly installed on one side of the filter chamber 92. The inlet end of the drain pipe 94 is connected to the inside of the filter chamber 92. An external drain pipe 94 connecting flange is fixedly connected to the outside of the drain pipe 94. An inlet flange is fixedly installed at the inlet end of the water inlet pipe 5. The filter chamber 92 is located directly below the dewaxing discharge hopper 10. The filter module 93 includes a top frame 931 and an insertion hole 932. Support plates 933 are fixedly connected to the four corners of the top frame 931. Mounting pins are fixedly connected to the bottom of each support plate 933. 934, Socket 932 is located at the four corners of the top of the filter housing 92. The bottom of the mounting pin 934 is inserted into the socket 932. Filter screens 935 are fixedly connected to both sides inside the top frame 931. A discharge assembly 936 is fixedly connected to the lower inner side of the filter screen 935. The discharge assembly 936 includes an arc-shaped filter screen 9361, which is fixedly connected to the bottom of the filter screen 935. The two filter screens 935 are arranged in an outward V-shape, opening upwards. A cleaning auger 9362 is rotatably connected to the inner side of the arc-shaped filter screen 9361. A second motor 9363 is fixedly installed on one side of the arc-shaped filter screen 9361. The output end of the second motor 9363 is connected to the cleaning auger 9362 through a coupling. The arc-shaped filter screen 9361 is located away from the first... The output end of the second motor 9363 is fixedly connected to the discharge pipe 9364. The bottom output end of the discharge pipe 9364 is fixedly installed with a discharge valve 9365. The filter box 92 has a disassembly and assembly reserved slot 9366 on the side near the discharge pipe 9364. The discharge pipe 9364 moves inside the disassembly and assembly reserved slot 9366. During the application of this device, through the setting of the mounting frame 91, filter box 92, filter module 93, drain pipe 94, water inlet flange, external drain pipe 94 connecting flange, and the filter module 93 including the top frame 931, support plate 933, mounting pin 934, insertion hole 932, filter screen 935, discharge component 936, etc., the wax liquid and a small amount of water liquid mixture discharged from the dewaxing discharge hopper 10 can fall accurately into the filter box during use. The mixture enters the filter chamber 92 directly below and first undergoes preliminary treatment through a filter screen 935, which is designed to open upwards in an outward V-shape, to intercept impurities. It then flows to an arc-shaped filter screen 9361 at the bottom, where the wax liquid is collected. At this time, the second motor 9363 starts, driving the cleaning auger 9362 inside the arc-shaped filter screen 9361 to rotate, conveying the collected wax liquid towards the discharge pipe 9364. After opening the discharge valve 9365, the wax liquid can be discharged and recycled through the discharge pipe 9364. The filtered water is discharged to a designated location through the drain pipe 94 and the external drain pipe 94 connecting flange. The inlet flange facilitates connection of the inlet pipe 5 to the external water supply line. When cleaning or replacing the filter module 93 is required...The discharge pipe 9364 can be removed using the pre-removed slot 9366 on one side of the filter housing 92. Then, the top frame 931 is pulled upwards, causing the mounting pin 934 at the bottom of the support plate 933 to disengage from the insertion hole 932 at the top of the filter housing 92. This allows the entire filter module 93 to be removed. The operation is simple and convenient. Throughout the filtration and collection process, the filter screen 935 and the arc-shaped filter screen 9361 work together to effectively separate the wax liquid from impurities and moisture. The cleaning auger 9362 ensures smooth discharge of the wax liquid. The detachable filter module 93 design facilitates maintenance, improving the purity and efficiency of wax liquid recovery, reducing raw material waste, and lowering the difficulty of equipment maintenance. This makes the wax liquid processing after dewaxing more efficient and reliable.

[0021] A method for dewaxing and filtering in investment casting includes the following steps: Step 1: Inject a fixed amount of water into the dewaxing chamber 4 through the water inlet pipe 5. Use the regulating valve at the water inlet pipe 5 to control the water injection volume and ensure that the water level covers the dewaxing discharge hopper 10. During the dewaxing process, continuously replenish water through the regulating valve to maintain this water level. After the water injection is completed, adjust the on / off state of the water inlet pipe 5 according to the liquid level. Step 2: Place the shell to be dewaxed on the internal support structure of the dewaxing chamber 4, start the controller 7, the controller 7 controls the operation of the electric heating module 6, and the electric heating tube 62 is energized to heat the water to the preset dewaxing temperature; Step 3: During the heating process, the controller 7 controls the operation of the steam emission mechanism 3. The electric push rod 32 retracts, causing the cover plate 34 to move down and cover the top of the dewaxing chamber 4. At the same time, the centrifugal steam blower 352 is started, and steam is drawn in through the steam exhaust hopper 351 and discharged through the steam exhaust pipe and the external steam exhaust pipe connecting flange. The temperature sensor 36 detects the water temperature in real time and transmits the data to the controller 7. The controller 7 adjusts the heating power of the electric heating tube 62 according to the data. Step 4: After the dewaxing time reaches the preset time, the controller 7 controls the feeding mechanism 8 to start. The first motor 82 runs and drives the lead screw 83 to rotate. The slider 84 slides along the guide rail 81, which drives the connecting arm 851, the fixing plate 852 and the wax push plate 853 to move, pushing the floating wax liquid towards the dewaxing discharge hopper 10. The liquid level sensor 854 monitors the liquid level in real time and transmits the data to the controller 7. The controller 7 adjusts the water replenishment frequency and water replenishment amount through the regulating valve. Step 5: The wax liquid falls into the filter box 92 through the dewaxing discharge hopper 10. The mixture first passes through the filter screen 935 to filter impurities, and then flows to the arc-shaped filter screen 9361. The controller 7 controls the second motor 9363 to drive the cleaning auger 9362 to rotate, conveying the wax liquid in the arc-shaped filter screen 9361 to the discharge pipe 9364. The discharge valve 9365 is opened to discharge the wax liquid for collection. The filtered water liquid is discharged through the drain pipe 94 and the external drain pipe 94 connecting flange. Step 6: After dewaxing is completed, the electric push rod 32 extends and moves the cover plate 34 upward to open the top of the dewaxing chamber 4, and the dewaxed shell is removed. When the filter module 93 needs to be cleaned or replaced, the discharge pipe 9364 is removed by disassembling the pre-reserved slot 9366, the top frame 931 is lifted to disengage the mounting pin 934 from the insertion hole 932, and the filter module 93 is removed. After cleaning or replacement, the mounting pin 934 is inserted into the insertion hole 932 to reset the filter module 93.

[0022] The working principle of this invention is as follows: When using this device, a fixed amount of water is first injected into the dewaxing chamber 4 through the water inlet pipe 5. A regulating valve is installed at the water inlet pipe 5 for liquid level replenishment and control. During the water inlet process, the water volume is controlled by the regulating valve to ensure that the water level overflows the dewaxing discharge hopper 10. Water can be continuously replenished through the regulating valve during the dewaxing process to maintain this water level, ensuring that the subsequent wax liquid can be smoothly discharged through the dewaxing discharge hopper 10. After the water inlet is completed, the on / off state of the water inlet pipe 5 is adjusted according to the liquid level using the regulating valve. The water inlet flange of the water inlet pipe 5 facilitates connection with external water supply pipelines, improving installation convenience. The mold shell to be dewaxed is placed on the supporting structure inside the dewaxing chamber 4. The controller 7 is activated, and the controller 7 sends a signal to operate the electric heating module 6. The electric heating tube 62 inside the tank 61 is energized to generate heat, heating the water liquid in the dewaxing chamber 4 until the water liquid reaches the preset dewaxing temperature. The electric heating module 6 provides stable heat to the water liquid, ensuring… The wax mold can be fully melted, solving the problem of incomplete melting of wax mold due to uneven heating in traditional dewaxing. During the heating process, the steam generated in the dewaxing chamber 4 will accumulate at the top of the chamber. The controller 7 controls the operation of the steam discharge mechanism 3. The electric push rod 32 retracts and drives the cover plate 34 to move down, so that the cover plate 34 tightly covers the top of the dewaxing chamber 4. At the same time, the centrifugal steam blower 352 starts and draws the steam in the dewaxing chamber 4 through the steam exhaust hopper 351. The steam is discharged to the designated recycling or treatment pipeline through the steam exhaust pipe and the external steam exhaust pipe connection flange, avoiding the steam from overflowing from the dewaxing discharge hopper 10 and preventing the steam from carrying wax liquid to adhere to the equipment surface and causing waste. The temperature sensor 36 detects the water temperature in the dewaxing chamber 4 in real time and transmits the detection data to the controller 7. The controller 7 adjusts the heating power of the electric heating tube 62 according to the temperature data to maintain the water temperature stable within the range required for dewaxing and ensure consistent dewaxing effect. The mold shell is continuously immersed in hot water, and the internal wax mold gradually melts. Because the density of wax is less than that of water, the melted wax floats on the surface of the water. The water level is continuously maintained by the regulating valve to keep the wax within the height range of the dewaxing discharge hopper 10, providing a basis for subsequent discharge. When the dewaxing process reaches the preset time, the controller 7 controls the pusher mechanism 8 to start. The first motor 82 runs and drives the lead screw 83 to rotate. The lead screw 83 is threadedly engaged with the slider 84, causing the slider 84 to slide along the inside of the guide rail 81. The slider 84 drives the connecting arm 851 and the fixing plate 852 to move synchronously. The wax pusher plate 853 at the bottom of the fixing plate 852 moves with the slider 84, pushing the wax floating on the water surface... The wax liquid is pushed towards the dewaxing discharge hopper 10. The pushing mechanism 8 is specially designed for the floating characteristics of the wax liquid. It pushes the wax liquid from the top of the water surface to the dewaxing discharge hopper 10, which completely avoids the problem of the wax liquid falling with the water flow and re-adhering to the mold shell and supporting structure when draining the water in traditional equipment. During the pushing process, the liquid level sensor 854 monitors the liquid level height in real time and transmits the detection data to the controller 7. The controller 7 adjusts the water replenishment frequency and water replenishment volume of the water inlet pipe 5 through the regulating valve according to the liquid level data, so as to ensure that the wax liquid push plate 853 is always in contact with the water surface, while maintaining the water level above the dewaxing discharge hopper 10, ensuring the integrity of the wax liquid pushing and the smoothness of the discharge, and improving the wax liquid recovery efficiency. The pushed wax liquid, aided by the water level, smoothly falls from the output end of the dewaxing discharge hopper 10 into the filter mechanism 9 below. The filter box 92 receives the mixture of wax liquid and a small amount of water falling from the dewaxing discharge hopper 10. After entering the filter box 92, the mixture first contacts the top frame 931 of the filter module 93 and the filter screen 935 supported by the support plate 933. The filter screen 935 filters impurities in the mixture. The filtered wax liquid and water flow to the arc-shaped filter screen 9361. The arc-shaped filter screen 9361 is mainly used to collect wax liquid and assist in its discharge. During collection, the filtration effect is maintained to prevent water from remaining at the arc-shaped filter screen 9361, achieving efficient separation of wax liquid and water. The wax liquid is easy to recycle and reuse, reducing raw material waste. The wax liquid collected inside the arc-shaped filter screen 9361 is controlled by the controller 7. The second motor 9363 drives the cleaning auger 9362 to rotate. The cleaning auger 9362 conveys the wax liquid inside the arc-shaped filter screen 9361 towards the discharge pipe 9364. The discharge valve 9365 is opened, and the wax liquid is discharged and collected through the discharge pipe 9364, realizing efficient collection of wax liquid and further reducing production costs. The separated water liquid is discharged to the designated location through the drain pipe 94 and the external drain pipe 94 connecting flange. The external drain pipe 94 connecting flange facilitates docking with the external drain pipe 94, improving ease of use. After dewaxing, the electric push rod 32 extends, causing the cover plate 34 to move upward, opening the top of the dewaxing chamber 4 to facilitate the removal of the dewaxed mold shell. When the filter module 93 needs cleaning or replacement, the discharge pipe 9364 can be removed through the pre-reserved slot 9366, and the top frame 931 can be pulled upward to allow the mounting pin 934 at the bottom of the support plate 933 to be pulled out from the insertion hole 932 at the top of the filter chamber 92. The filter module 93 can then be removed as a whole. After cleaning or replacement, the mounting pin 934 can be reinserted into the insertion hole 932 to restore the filter module 93. The detachable filter module 93 ensures long-term stable filtration performance. The device uses controller 7 to coordinate the operation of various mechanisms and, together with the regulating valve at the inlet pipe 5, precisely maintains the water level, realizing an automated process of dewaxing, wax delivery, filtration, and collection. It eliminates the need for secondary manual inspection and manual wax removal, reducing human intervention and improving production efficiency. The system solves the problems of incomplete dewaxing, difficulty in wax recovery, raw material waste, and high labor costs in the background technology by addressing multiple aspects such as heating, steam treatment, wax separation, and filtration collection.

Claims

1. A dewaxing and filtering device for investment casting, characterized in that, The device includes a base, a support frame fixedly connected to the top of the base, a dewaxing chamber fixedly connected to the top of the support frame, electric heating modules on both sides of the dewaxing chamber, a steam exhaust mechanism on the top of the dewaxing chamber, a water inlet pipe fixedly installed on the upper side of one side of the dewaxing chamber, a controller fixedly installed on the upper side of the dewaxing chamber near the water inlet pipe, a material pushing mechanism fixedly installed on the upper front side of the dewaxing chamber, a filter mechanism fixedly installed on the side of the dewaxing chamber away from the water inlet pipe, and a dewaxing discharge hopper fixedly installed on the upper side of the dewaxing chamber near the filter mechanism, with the output end of the dewaxing discharge hopper located above the filter mechanism. The feeding mechanism includes a guide rail, which is fixedly installed on the upper front of the dewaxing chamber. A first motor is fixedly installed at one end of the guide rail. A lead screw is rotatably connected inside the guide rail. A slider is threadedly connected to the outer surface of the lead screw. The slider is slidably connected inside the guide rail. A scraping module is fixedly connected to the side of the slider near the dewaxing chamber. The output end of the first motor is connected to the end of the lead screw through a coupling.

2. The investment casting dewaxing and filtering device according to claim 1, characterized in that, The electric heating module includes a tank, which is located on both sides of the dewaxing chamber. Electric heating tubes are fixedly connected inside the tank in a linear arrangement at equal intervals.

3. The investment casting dewaxing and filtering device according to claim 2, characterized in that, The scraping module includes a connecting arm, which is fixedly connected to the outside of the slider. A fixing plate is fixedly connected to the bottom end of the connecting arm, and a wax pusher plate is fixedly connected to the bottom of the fixing plate. A liquid level sensor is fixedly connected to one end of the fixing plate.

4. The investment casting dewaxing and filtering device according to claim 1, characterized in that, The steam emission mechanism includes a circular plate, which is fixedly connected to one end of the back of the dewaxing chamber. An electric push rod is fixedly connected to the middle of the circular plate. A connecting rod is fixedly connected to the top of the electric push rod. A cover plate is fixedly connected to the top of the connecting rod. The cover plate covers the top of the dewaxing chamber. An exhaust assembly is fixedly installed on the top of the cover plate.

5. The investment casting dewaxing and filtering device according to claim 4, characterized in that, A temperature sensor is fixedly installed on one side of the top of the cover plate. When the electric push rod is retracted, the detection end of the temperature sensor is in contact with the water in the dewaxing chamber. The input end of the exhaust assembly passes through the cover plate and is connected to the dewaxing chamber.

6. The investment casting dewaxing and filtering device according to claim 5, characterized in that, The exhaust assembly includes a steam exhaust hopper, which is fixedly connected to the top of the cover plate. A centrifugal steam induced draft fan is fixedly connected to the output end of the steam exhaust hopper. A steam exhaust pipe is fixedly installed at the output end of the centrifugal steam induced draft fan. An external steam exhaust pipe connection flange is fixedly installed at the outer end of the steam exhaust pipe.

7. The investment casting dewaxing and filtering device according to claim 6, characterized in that, The filtration mechanism includes a mounting frame, which is fixedly installed on the lower side of the dewaxing chamber. A filter box is fixedly installed on the top of the mounting frame. A filter module is movably installed inside the filter box. A drain pipe is fixedly installed on one side of the filter box. The inlet end of the drain pipe is connected to the inside of the filter box. An external drain pipe connection flange is fixedly connected to the outside of the drain pipe. An inlet flange is fixedly installed at the inlet end of the water inlet pipe. The filter box is located directly below the dewaxing discharge hopper.

8. The investment casting dewaxing and filtering device according to claim 7, characterized in that, The filter module includes a top frame and insertion holes. Support plates are fixedly connected to the four corners of the top frame, and mounting pins are fixedly connected to the bottom of the support plates. The insertion holes are opened at the four corners of the top of the filter box, and the bottom of the mounting pins is inserted into the insertion holes. Filter screens are fixedly connected to both sides of the top frame, and discharge components are fixedly connected to the lower inner side of the filter screens.

9. The investment casting dewaxing and filtering device according to claim 8, characterized in that, The discharge assembly includes an arc-shaped filter screen, which is fixedly connected to the bottom of the filter screen. The two filter screens are arranged in an outward V-shape and open upwards. A cleaning auger is rotatably connected to the inner side of the arc-shaped filter screen. A second motor is fixedly installed on one side of the arc-shaped filter screen. The output end of the second motor is connected to the cleaning auger through a coupling. A discharge pipe is fixedly connected to the output end of the arc-shaped filter screen away from the second motor. A discharge valve is fixedly installed at the bottom output end of the discharge pipe. A disassembly and assembly reserved slot is opened on the side of the filter box near the discharge pipe. The discharge pipe moves inside the disassembly and assembly reserved slot.

10. A method for dewaxing and filtering in investment casting, using the investment casting dewaxing and filtering device according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Inject a fixed amount of water into the dewaxing chamber through the water inlet pipe. Use the regulating valve at the water inlet pipe to control the water injection volume and ensure that the water level covers the dewaxing discharge hopper. During the dewaxing process, continuously replenish water through the regulating valve to maintain this water level. After the water inlet is completed, adjust the on / off state of the water inlet pipe according to the liquid level. Step 2: Place the shell to be dewaxed on the internal support structure of the dewaxing chamber, start the controller, and the controller controls the operation of the electric heating module. The electric heating tube is energized to heat the water to the preset dewaxing temperature. Step 3: During the heating process, the controller controls the operation of the steam exhaust mechanism. The electric push rod retracts, causing the cover plate to move down and cover the top of the dewaxing chamber. At the same time, the centrifugal steam blower is started, drawing steam through the steam exhaust hopper and discharging it through the steam exhaust pipe and the external steam exhaust pipe connecting flange. The temperature sensor detects the water temperature in real time and transmits the data to the controller. The controller adjusts the heating power of the electric heating tube according to the data. Step 4: After the dewaxing time reaches the preset time, the controller starts the feeding mechanism. The first motor drives the lead screw to rotate, and the slider slides along the guide rail, which drives the connecting arm, the fixed plate and the wax push plate to move, pushing the floating wax liquid to the dewaxing discharge hopper. The liquid level sensor monitors the liquid level in real time and transmits the data to the controller. The controller adjusts the water replenishment frequency and water replenishment amount through the regulating valve. Step 5: The wax liquid falls into the filter box through the dewaxing discharge hopper. The mixture first passes through the filter screen to filter impurities, and then flows to the arc-shaped filter screen. The controller controls the second motor to drive the cleaning auger to rotate, which transports the wax liquid in the arc-shaped filter screen to the discharge pipe. The discharge valve is opened to discharge the wax liquid for collection. The filtered water liquid is discharged through the drain pipe and the external drain pipe connecting flange. Step 6: After dewaxing is complete, the electric push rod extends and moves the cover plate up to open the top of the dewaxing chamber, and the dewaxed shell is removed. When the filter module needs to be cleaned or replaced, the discharge pipe is removed by disassembling the reserved slot, the top frame is lifted to disengage the mounting pin from the socket, and the filter module is removed. After cleaning or replacement, the mounting pin is inserted into the socket to reset the filter module.

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