Hot air dry dewaxing system

Abstract

The present invention relates to a hot air drying dewaxing system, comprising: a mold fixing platform, a dewaxing treatment chamber, a roasting furnace, a fan and a wax collecting pool, the mold fixing platform is used to place the mold, the roasting furnace is arranged next to the dewaxing treatment chamber, the air inlet of the fan is connected to the roasting furnace, the air outlet of the fan is connected to the dewaxing treatment chamber, the mold fixing platform can enter the dewaxing treatment chamber through a pulley rotation, the wax collecting pool is located below the horizontal ground surface, and the wax discharge port of the dewaxing treatment chamber allows the fluid wax to enter the wax collecting pool through the wax discharge channel. In the hot air drying dewaxing system described in the present invention, the roasting furnace fan sends hot air to the transmission pipeline, and the heat is transferred to the mold by the heat dissipation pipe. This method shortens the roasting time of the roasting furnace, and the fluid wax obtained by high-temperature melting passes through a three-layer 140-mesh filter screen, and can be reused in the wax mold workshop again, which reduces energy consumption, meets environmental protection requirements, saves raw materials, and reduces raw material costs.

Description

Technical Field

[0001] The invention belongs to the technical field of precision casting, and in particular relates to a hot air drying dewaxing system. Background Art

[0002] There are two traditional dewaxing methods, one is hot water dewaxing and the other is autoclave dewaxing. The process of hot water dewaxing is: in the dewaxing tank, water and hydrochloric acid are mixed with hot water in a mass ratio of 100:1, and heated to 98°C, and the mold shell to be dewaxed is placed in the dewaxing tank, and the dewaxing is completed when the mold shell wax is completely melted. Its disadvantages are: 1. The dewaxing casting product is prone to sand holes, which reduces the strength of the mold shell, affects the surface quality of the casting and the high temperature strength of the mold shell; 2. Hydrochloric acid needs to be added during the dewaxing process, which pollutes the environment; 3. Hot water dewaxing will produce wastewater, which needs to be discharged and treated, increasing the factory cost; 4. The operating environment is poor, high temperature environment is easy to burn, and the safety is poor. The process of autoclave dewaxing is: put the completed mold shell into the autoclave, and wait for the mold shell wax to melt completely, that is, the dewaxing is completed. Silica sol is generally used in this way. Its disadvantages are: 1. The mold shell is easily damaged due to the high pressure of the autoclave; 2. Silica sol is prone to remelting; 3. High-pressure steam requires high-temperature auxiliary equipment, such as steam generators, etc. Due to the high temperature, workers are easily injured and the workshop temperature is too high.

[0003] Therefore, the object of the present invention is to obtain a hot air dry dewaxing system by changing the structure of the processing equipment to replace the dewaxing method in the prior art. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the problems in the prior art such as poor quality of casting products, non-compliance with national environmental protection requirements, and high cost.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a hot air dry dewaxing system, including: a mold shell fixing table, a dewaxing treatment chamber, a roasting furnace, a fan and a wax collecting pool,

[0006] The mold fixing platform comprises a mold fixing frame for placing the mold, a first wax storage tray for collecting fluid wax, and a moving platform, wherein the mold fixing frame is placed on the first wax storage tray, the first wax storage tray is placed on the moving platform, and a plurality of pulleys are installed below the moving platform.

[0007] The roasting furnace is arranged beside the dewaxing treatment chamber, the air inlet of the fan is connected to the roasting furnace, and the air outlet of the fan is connected to the dewaxing treatment chamber.

[0008] The dewaxing treatment chamber includes a chamber body, a conveying pipe, a plurality of heat dissipation pipes, an exhaust port, a wax discharge port and a plurality of tracks, the conveying pipe and the plurality of heat dissipation pipes are arranged on the inner wall of the chamber body, one end of the conveying pipe is connected to the air outlet of the fan, and the other end is connected to the heat dissipation pipe, each heat dissipation pipe is provided with a plurality of heat dissipation ports, the heat dissipation ports face the central area of ​​the chamber body, the exhaust port is located at the top of the chamber body and is connected to the outside, the wax discharge port is located at the bottom of one side wall of the chamber body, the plurality of tracks are arranged on the bottom inner surface of the chamber body, the plurality of tracks cooperate with the pulley, and the mold shell fixing platform can enter the chamber body through the rotation of the pulley.

[0009] The wax collecting pool is located below the horizontal ground surface, one end of the wax discharge channel is connected to the wax discharge port, and the other end is located above the wax collecting pool, and fluid wax enters the wax collecting pool from the wax discharge port through the wax discharge channel.

[0010] As a preferred embodiment of the present invention, the mold shell fixing frame has a rectangular fixing frame, a plurality of fixing bars and a plurality of fixing feet, the bottom of the fixing feet stands on the first wax storage tray, the top of the fixing feet is connected to the rectangular fixing frame, the plurality of fixing bars are arranged in parallel in the rectangular fixing frame, and the two ends of the plurality of fixing bars are respectively connected to the rectangular fixing frame.

[0011] As a preferred embodiment of the present invention, a fluid wax outlet is provided at the bottom of the first wax storage tray, and when the mold shell fixing platform is pushed into the dewaxing treatment chamber, the fluid wax outlet is located directly above the wax discharge port.

[0012] As a preferred embodiment of the present invention, the mold shell fixing platform also includes a second wax storage tray. When the mold shell fixing platform is pushed out of the dewaxing treatment chamber, the fluid wax outlet is located directly above the second wax storage tray.

[0013] As a preferred embodiment of the present invention, the bottom plate on the first wax storage tray is inclined toward the direction of the fluid wax outlet.

[0014] As a preferred embodiment of the present invention, the chamber body has three side walls, a top wall and a side door, the multiple heat dissipation pipes are respectively located on the three side walls and one top wall of the chamber body, and the heat dissipation pipes located on the three side walls are interconnected.

[0015] As a preferred embodiment of the present invention, the wax collecting pool comprises a first filtering sub-pool, a second filtering sub-pool and a third filtering sub-pool, which are arranged in sequence, a first partition is provided between the first filtering sub-pool and the second filtering sub-pool, a first filter net is embedded on the first partition, a second partition is provided between the second filtering sub-pool and the third filtering sub-pool, a second filter net is embedded on the second partition, a filter basket is provided in the first filtering sub-pool, a basket wall of the filter basket is composed of a third filter net, one end of the wax discharge channel is located above the filter basket, and the fluid wax passes through the first filtering sub-pool, the second filtering sub-pool and the third filtering sub-pool in sequence from the wax discharge channel, and the third filtering sub-pool leads to the wax model workshop through a pipeline.

[0016] As a preferred embodiment of the present invention, a pump body for extracting fluid wax is provided on the pipeline.

[0017] As a preferred embodiment of the present invention, the apertures of the first filter screen, the second filter screen and the third filter screen are all 140 meshes.

[0018] As a preferred embodiment of the present invention, the hot air drying dewaxing system also includes a control device, which controls the opening and closing of the side door of the chamber body; the movable platform is provided with a motor for driving the pulley to rotate, and the motor is electrically connected to the control device. When the motor is started, the mold shell fixing platform moves into or out of the dewaxing treatment chamber; the pump body is electrically connected to the control device. When the pump body is started, the fluid wax is sent from the wax collecting pool into the wax mold workshop.

[0019] The beneficial effects of the present invention are:

[0020] 1. The hot air dry dewaxing system consists of four parts: mold shell fixing table, dewaxing treatment chamber, burning chamber, and wax collecting pool. It has a simple structure and low equipment manufacturing cost;

[0021] 2. After filtering, the fluid wax can be recycled, reducing energy consumption;

[0022] 3. During the dewaxing process, there is no need to add hydrochloric acid treatment, so there is no pollution and protects the environment;

[0023] 5. Since the dewaxed casting products are not exposed to water vapor, they do not need to be dried again, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the mold shell fixing platform, the dewaxing treatment chamber and the baking furnace of the hot air dry dewaxing system of the present invention;

[0025] Figure 2It is a schematic structural diagram of a dewaxing treatment chamber, a roasting furnace and a wax collecting pool of the hot air dry dewaxing system of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the dewaxing treatment chamber of the hot air dry dewaxing system described in the present invention.

[0027] Among them, 1 is a mold fixing table, 11 is a mold fixing frame, 111 is a rectangular fixing frame, 112 is a fixing bar, 113 is a fixing foot, 12 is a first wax storage tray, 121 is a fluid wax outlet, 13 is a moving table, 14 is a pulley, 15 is a second wax storage tray, 2 is a dewaxing treatment chamber, 21 is a chamber body, 22 is a transmission pipeline, 23 is a heat dissipation pipe, 24 is an exhaust port, 25 is a wax discharge port, 26 is a track, 27 is a heat dissipation port, 28 is a wax discharge channel, 3 is a roasting furnace, 4 is a wax collecting pool, 41 is a first filtering sub-pool, 42 is a second filtering sub-pool, 43 is a third filtering sub-pool, 44 is a first partition, 45 is a second partition, 46 is a filter basket, and 47 is a pump body. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with specific embodiments, but the scope of the present invention is not limited to these embodiments.

[0029] Example 1

[0030] See also Figure 1-3 , Figure 1 It is a structural schematic diagram of the mold shell fixing platform, the dewaxing treatment chamber and the baking furnace of the hot air dry dewaxing system of the present invention; Figure 2 It is a schematic structural diagram of a dewaxing treatment chamber, a roasting furnace and a wax collecting pool of the hot air dry dewaxing system of the present invention; Figure 3 Schematic diagram of the structure of the dewaxing treatment chamber of the hot air dry dewaxing system of the present invention. Figure 1-3 As shown, the hot air dry dewaxing system includes: a mold shell fixing platform 1, a dewaxing treatment chamber 2, a roasting furnace 3, a fan (not shown) and a wax collecting pool 4. For ease of understanding, the above five parts are now introduced in detail.

[0031] The mold fixing platform 1 is divided into: a mold fixing frame 11, a first wax storage tray 12 and a moving platform 13 according to its structure from top to bottom. The mold fixing frame 11 is used to place the mold (not shown in the figure), and the mold is placed on the mold fixing frame 11 in an inverted form and fixed and adjusted by angle irons; the mold fixing frame 11 is placed on the first wax storage tray 12, and the first wax storage tray 12 is used to collect fluid wax. When the wax on the mold melts, it drips into the first wax storage tray 12. A fluid wax outlet 121 is provided on the bottom plate of the first wax storage tray 12, and the bottom plate of the first wax storage tray 12 is inclined in the direction of the fluid wax outlet 121. When there is fluid wax in the first wax storage tray 12, the fluid wax will be discharged from the fluid wax outlet 121; the first wax storage tray 12 is placed on the moving platform 13. In order to realize the moving function, a plurality of pulleys 14 are installed below the moving platform 13, so that the mold fixing platform 1 can enter or exit the chamber body 21 through the rotation of the pulley 14.

[0032] In one embodiment, the mold shell fixing frame 11 is divided into three parts: a rectangular fixing frame 111, a plurality of fixing bars 112 and a plurality of fixing feet 113. The plurality of fixing bars 112 are arranged in parallel in the rectangular fixing frame 111. Both ends of the plurality of fixing bars 112 are respectively connected to the rectangular fixing frame 111 to form a plane fence structure. The plurality of mold shells are arranged in sequence between adjacent fixing bars. The plurality of fixing feet 113 are used to support the rectangular fixing frame 111. The plurality of fixing feet 113 are perpendicular to and connected to the rectangular fixing frame 111, and the bottom is placed on the first wax storage tray 12.

[0033] When the mold shell fixing platform 1 is pushed out of the chamber body 21, the wax on the mold shell must have been completely melted. However, some of the wax may still remain in the first wax storage tray 12. In order to prevent a small amount of fluid wax from flowing from the fluid wax outlet 121 of the first wax storage tray 12 to the ground, which is not conducive to recovery, a second wax storage tray 15 is provided next to the mold shell fixing platform 1. When the mold shell fixing platform 1 is pushed out of the dewaxing treatment chamber 2, the fluid wax outlet 121 is located directly above the second wax storage tray 15.

[0034] The roasting furnace 3 is arranged near the dewaxing treatment chamber 2, and the best setting position is to be close to the dewaxing treatment chamber 2. The roasting furnace 3 is connected to the dewaxing treatment chamber 2 by a pipeline, and a fan is provided on the connecting pipeline. The air inlet (not shown) of the fan is connected to the roasting furnace 3, and the air outlet (not shown) of the fan is connected to the dewaxing treatment chamber 2. The heat obtained by the roasting furnace 3 is sent to the dewaxing treatment chamber 2 through the fan and the pipeline, and is used to increase the temperature of the dewaxing treatment chamber 2, so as to achieve the purpose of melting the wax on the mold shell.

[0035] The dewaxing treatment chamber 2 is divided into four parts according to the functions. The first part is the chamber body 21 for providing a storage space for the mold fixing platform 1; the second part is a plurality of tracks 26 for providing a conveying function for the mold fixing platform 1; the third part is a conveying pipe 22, a plurality of heat dissipation pipes 23 and an exhaust port 24 for conveying heat; the fourth part is a wax discharge port 25 for discharging fluid wax; the conveying pipe 22 and the plurality of heat dissipation pipes 23 are both arranged on the inner wall of the chamber body 21, the conveying pipe 22 is attached to the side wall close to the roasting furnace 3, and one end of the conveying pipe 22 is connected to the air outlet of the fan. , used to transfer heat from the roasting furnace 3 to the dewaxing treatment chamber 2, the other end of the transmission pipe 22 is connected to at least one heat dissipation pipe 23, and the remaining heat dissipation pipes 23 can be connected end to end with this heat dissipation pipe 23, or can be directly connected to the transmission pipe 22 to obtain heat transfer, multiple heat dissipation pipes 23 are respectively located on the three side walls and one top wall of the chamber body 21, and multiple heat dissipation ports 27 are provided on each heat dissipation pipe 23, and the exhaust direction of the heat dissipation port 27 is toward the central area of ​​the chamber body 21. When the mold shell fixing platform 1 is placed in the chamber body 21, multiple heat dissipation ports 27 are all facing the mold shell. Under the action of hot air, the fixed wax on the surface of the mold shell becomes fluid wax, and the temperature of the hot air after heat exchange is reduced and discharged to the outside atmosphere from the exhaust port 24 located at the top of the chamber body 21. The discharged hot air is already at a relatively low temperature, without too much heat loss, and has little impact on the outside temperature or environment. In addition, there are no other undesirable components in the hot air, and there is no pollution to the environment. The wax discharge port 25 is located at the bottom of one side wall of the chamber body 21. When the mold shell fixing platform 1 is pushed into the dewaxing treatment chamber 2, the fluid wax outlet 121 is located directly above the wax discharge port 25. Therefore, the fluid wax discharged from the fluid wax outlet 121 is discharged to the outside through the wax discharge port 25. A plurality of tracks 26 are arranged on the inner floor of the chamber body 21 to facilitate the cooperation with the pulley 14 of the mold shell fixing platform 1 and to limit the mold shell fixing platform 1 after entering the chamber body 21 to avoid touching or damaging the heat dissipation pipe 23 on the side wall.

[0036] The wax collecting pool 4 is located below the horizontal ground surface. One end of the wax discharge channel 28 is connected to the wax discharge port 25, and the other end is located above the wax collecting pool 4. The fluid wax enters the wax collecting pool 4 from the wax discharge port 25 through the wax discharge channel 28. The wax collecting pool 4 is divided into three filtrations, and therefore, is divided into three filtering sub-pools, namely the first filtering sub-pool 41, the second filtering sub-pool 42 and the third filtering sub-pool 43. The first filtering sub-pool 41, the second filtering sub-pool 42 and the third filtering sub-pool 43 are arranged in sequence. The fluid wax passes through the first filtering sub-pool 41, the second filtering sub-pool 42 and the third filtering sub-pool 43 in sequence. The two adjacent filtering sub-pools are separated by a closed partition. A filter net is set at the bottom of the partition, which passes through the two adjacent filtering sub-pools. Therefore, a first partition 44 is set between the first filtering sub-pool 41 and the second filtering sub-pool 42. A first filter net (not shown) is embedded in the first partition 44. The second filtering sub-pool 42 A second partition 45 is provided between the first filter sub-tank 41 and the third filter sub-tank 43, and a second filter net (not shown) is embedded on the second partition 45. A filter basket 46 is provided in the first filter sub-tank 41, and the basket wall of the filter basket 46 is composed of a third filter net (not shown). The filter basket 46 can be directly taken out from the first filter sub-tank 41. One end of the wax discharge channel 28 is located above the filter basket 46. The fluid wax passes through the first filter sub-tank 41, the second filter sub-tank 42 and the third filter sub-tank 43 from the wax discharge channel 28 in sequence. The third filter sub-tank 43 leads to the wax model workshop (not shown) through a pipeline, and a pump body 47 for extracting fluid wax is provided on the pipeline, so that the fluid wax can be quickly recovered from the wax collection tank 4. When there are many impurities in the filter basket 46, the filter basket 46 can be directly taken out for cleaning, which is convenient and fast.

[0037] In order to make the above-mentioned hot air drying dewaxing system more convenient and mechanized, it also includes a control device (not shown in the figure), which can be used to control the opening and closing of the side door of the chamber body 21; it can also be used to control the motor (not shown in the figure) that drives the pulley 14 to rotate. When the motor is started, the mold shell fixing platform 1 moves into or out of the dewaxing treatment chamber 2; it can also be used to control the opening and closing of the pump body 47. When the pump body 47 is started, the fluid wax is sent from the wax collecting pool 4 into the wax mold workshop.

[0038] The following is an introduction to the working principle of the hot air dry dewaxing system: first, place the mold fixing platform 1 upside down on the furnace table and fix it with angle irons, open the side door of the chamber body 21 through the control device, start the motor through the control device to push the mold fixing platform 1 into the chamber body 21, close the side door of the chamber body 21 through the control device, set the temperature of the roasting furnace 3 to 240°C, and then ignite; about 8 minutes later, the mold on the mold fixing platform 1 begins to flow with fluid wax; about 15-20 minutes later, set the temperature to 150°C, and about 3 hours later, set the temperature to 100°C, and stop heating when there is no fluid wax flowing out of the wax discharge port 25, and the dewaxed mold is sent out from the dewaxing treatment chamber 2. The fluid wax flowing into the wax collecting pool 4 is filtered by three filtering sub-pools and then sent to the wax mold workshop by the pump body 47 for reuse.

[0039] To sum up, in the hot air drying dewaxing system described in the present invention, the roasting furnace fan sends hot air to the transmission pipeline, and the heat pipe transfers the heat to the mold shell. This method shortens the roasting time of the roasting furnace from the original 8-10 hours to the current 4-5 hours. The fluid wax obtained by high-temperature melting passes through a three-layer 140-mesh filter and can be reused in the wax mold workshop, which reduces energy consumption, meets environmental protection requirements, saves raw materials, and reduces raw material costs.

[0040] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. Hot air dry dewaxing system, characterized in that: include: Formwork fixing table, dewaxing treatment room, roasting furnace, fan and wax collecting pool, The mold fixing platform comprises a mold fixing frame for placing the mold, a first wax storage tray for collecting fluid wax, and a moving platform, wherein the mold fixing frame is placed on the first wax storage tray, the first wax storage tray is placed on the moving platform, and a plurality of pulleys are installed below the moving platform. The roasting furnace is arranged beside the dewaxing treatment chamber, the air inlet of the fan is connected to the roasting furnace, and the air outlet of the fan is connected to the dewaxing treatment chamber. The dewaxing treatment chamber includes a chamber body, a conveying pipe, a plurality of heat dissipation pipes, an exhaust port, a wax discharge port and a plurality of tracks, the conveying pipe and the plurality of heat dissipation pipes are arranged on the inner wall of the chamber body, one end of the conveying pipe is connected to the air outlet of the fan, and the other end is connected to the heat dissipation pipe, each heat dissipation pipe is provided with a plurality of heat dissipation ports, the heat dissipation ports face the central area of ​​the chamber body, the exhaust port is located at the top of the chamber body and is connected to the outside, the wax discharge port is located at the bottom of one side wall of the chamber body, the plurality of tracks are arranged on the bottom inner surface of the chamber body, the plurality of tracks cooperate with the pulley, and the mold shell fixing platform can enter the chamber body through the rotation of the pulley. The wax collecting pool is located below the horizontal ground surface, one end of the wax discharge channel is connected to the wax discharge port, and the other end is located above the wax collecting pool, and the fluid wax enters the wax collecting pool from the wax discharge port through the wax discharge channel. A fluid wax outlet is provided at the bottom of the first wax storage tray. When the mold shell fixing platform is pushed into the dewaxing treatment chamber, the fluid wax outlet is located directly above the wax discharge port. The mold shell fixing platform also includes a second wax storage tray. When the mold shell fixing platform is pushed out of the dewaxing treatment chamber, the fluid wax outlet is located directly above the second wax storage tray. The chamber body has three side walls, a top wall and a side door, the plurality of heat dissipation pipes are respectively located on the three side walls and a top wall of the chamber body, and the heat dissipation pipes located on the three side walls are interconnected. The wax collecting pool comprises a first filtering sub-pool, a second filtering sub-pool and a third filtering sub-pool, which are arranged in sequence, a first partition is provided between the first filtering sub-pool and the second filtering sub-pool, a first filter net is embedded on the first partition, a second partition is provided between the second filtering sub-pool and the third filtering sub-pool, a second filter net is embedded on the second partition, a filter basket is provided in the first filtering sub-pool, a basket wall of the filter basket is composed of a third filter net, one end of the wax discharge channel is located above the filter basket, and the fluid wax passes through the first filtering sub-pool, the second filtering sub-pool and the third filtering sub-pool in sequence from the wax discharge channel, and the third filtering sub-pool leads to the wax model workshop through a pipeline.

2. The hot air dry dewaxing system according to claim 1, characterized in that: The mold shell fixing frame has a rectangular fixing frame, a plurality of fixing strips and a plurality of fixing feet, the bottom of the fixing feet stands on the first wax storage tray, the top of the fixing feet is connected to the rectangular fixing frame, the plurality of fixing strips are arranged in parallel in the rectangular fixing frame, and the two ends of the plurality of fixing strips are respectively connected to the rectangular fixing frame.

3. The hot air dry dewaxing system according to claim 1, characterized in that: The bottom plate on the first wax storage tray is inclined toward the direction of the fluid wax outlet.

4. The hot air dry dewaxing system according to claim 1, characterized in that: A pump body for extracting fluid wax is arranged on the pipeline.

5. The hot air dry dewaxing system according to claim 1, characterized in that: The apertures of the first filter screen, the second filter screen and the third filter screen are all 140 meshes.

6. The hot air dry dewaxing system according to claim 4, characterized in that: The hot air dry dewaxing system also includes a control device, which controls the opening and closing of the side door of the chamber body; the movable platform is provided with a motor for driving the pulley to rotate, and the motor is electrically connected to the control device. When the motor is started, the mold shell fixing platform moves into or out of the dewaxing treatment chamber; the pump body is electrically connected to the control device. When the pump body is started, the fluid wax is sent from the wax collecting pool into the wax mold workshop.

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