CN110732642A - Hot Air Dry Dewaxing System - Google Patents

Abstract

The invention relates to a hot air dry dewaxing system, comprising: a mould shell fixing table, a dewaxing treatment room, a roasting furnace, a fan and a wax collecting pool, the mould shell fixing table is used for placing mould shells, and the roasting furnace is arranged in the dewaxing treatment room On the side, 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 mold shell fixing table can be rotated into the dewaxing treatment chamber through the pulley. mouth, the fluid wax enters the wax pool through the wax discharge channel. In the hot air dry dewaxing system of the present invention, the roasting furnace fan sends the hot air to the conveying pipe, and the heat is transferred to the mold shell by the radiating pipe. This method shortens the roasting furnace roasting time, and obtains the result by melting at high temperature. The fluid wax passed through the three-layer 140-mesh filter screen 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

Hot Air Dry Dewaxing System

technical field

The invention belongs to the technical field of precision casting, in particular to a hot air dry method dewaxing system.

Background technique

There are two traditional dewaxing methods, one is hot water dewaxing and the other is autoclave dewaxing. The process of hot water dewaxing is as follows: 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 put into the dewaxing tank, and the When all the shell wax is melted, the dewaxing is completed. The disadvantages are: 1. The protruding casting products are easy to cause sand holes, which reduces the strength of the mold shell, which affects the surface quality of the casting and the high temperature resistance of the mold shell; 2. The dewaxing process needs to add hydrochloric acid, polluting the environment; 3. Hot water Dewaxing will produce waste water, which needs to be discharged and treated, which increases the cost of the factory; 4. The operating environment is poor, the high temperature environment is easy to burn, and the safety is poor. The process of autoclave dewaxing is as follows: put the completed mold shell into the autoclave, and wait until the mold shell wax is completely melted, that is, the dewaxing is completed. Silica sol is generally used in this way. The disadvantages are: 1. The mold shell is easily damaged due to the high pressure of the autoclave; 2. The silica sol is easy to melt back; 3. The high-pressure steam requires high-temperature auxiliary equipment, such as a steam generator, etc. Due to the high temperature, it is easy for workers to Injury, workshop temperature is too high.

Therefore, the purpose of the present invention is to obtain a hot air dry dewaxing system by changing the structure of the processing equipment, so as to replace the dewaxing method in the prior art.

SUMMARY OF THE INVENTION

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

The technical scheme 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 room, a roasting furnace, a fan and a wax collecting pool,

The formwork fixing table includes a formwork holder for placing the formwork, a first wax storage tray for collecting fluid wax, and a moving table, and the formwork holder is placed on the first wax storage tray, The first wax storage tray is placed on the mobile platform, and a plurality of pulleys are installed below the mobile platform.

The roasting furnace is arranged beside the dewaxing treatment chamber, the air inlet of the fan communicates with the roasting furnace, and the air outlet of the fan communicates with the dewaxing treatment chamber,

The dewaxing treatment chamber includes a chamber body, a transfer pipe, a plurality of heat dissipation pipes, an exhaust port, a wax discharge port and a plurality of rails, and the transfer pipe and the plurality of heat dissipation pipes are arranged on the inner wall of the chamber body, so the One end of the transmission 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, and the heat dissipation ports face the central area of the chamber body. The port is located at the top of the chamber body and communicated with the outside world, the wax discharge port is located at the bottom of one side wall of the chamber body, and the plurality of tracks are arranged on the bottom inner surface of the chamber body, so The plurality of rails cooperate with the pulleys, and the mold shell fixing platform can be rotated into the chamber body through the pulleys,

The wax collection tank 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 collection tank, and the fluid wax enters the wax discharge port from the wax discharge port through the wax discharge channel. in the wax pool.

As a preferred embodiment of the present invention, the mold case fixing frame has a rectangular fixing frame, a plurality of fixing bars and a plurality of fixing feet, the bottoms of the fixing feet stand on the first wax storage tray, and the The tops of the fixing feet are connected to the rectangular fixing frame, the plurality of fixing bars are arranged in parallel on the rectangular fixing frame, and two ends of the plurality of fixing bars are respectively connected to the rectangular fixing frame.

As a preferred embodiment of the present invention, the bottom of the first wax storage tray is provided with a fluid wax outlet. After the mold shell fixing table is pushed into the dewaxing treatment chamber, the fluid wax outlet is located at the bottom of the first wax storage tray. directly above the wax outlet.

As a preferred embodiment of the present invention, the mold case fixing table further includes a second wax storage tray, and after the mold case fixing table is pushed out of the dewaxing processing chamber, the fluid wax outlet is located in the second wax storage tray. directly above the wax tray.

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.

As a preferred embodiment of the present invention, the chamber body has three side walls, a top wall and a side door, and the plurality of heat dissipation pipes are respectively located on the three side walls and a top wall of the chamber body, The heat pipes on the three side walls communicate with each other.

As a preferred embodiment of the present invention, the wax collecting tank has a first filter sub-pool, a second filter sub-pool and a third filter sub-pool, the first filter sub-pool, the second filter sub-pool and the third filter sub-pool The filter sub-pools are arranged in sequence, a first partition plate is arranged between the first filter sub-pool and the second filter sub-pool, a first filter screen is embedded on the first partition plate, and the second filter sub-pool is A second partition is arranged between the pool and the third filter sub-pool, a second filter screen is embedded on the second partition, a filter basket is arranged in the first filter sub-pool, and the filter basket is The basket wall is composed of a third filter screen, one end of the wax discharge channel is located above the filter basket, and the fluid wax passes through the first filter sub-pool, the second filter sub-pool and the third filter sub-pool sequentially from the wax discharge channel. The filter sub-pool, the third filter sub-pool leads to the wax mold workshop through a pipeline.

As a preferred embodiment of the present invention, the pipeline is provided with a pump body for extracting fluid wax.

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.

As a preferred embodiment of the present invention, the hot air dry dewaxing system further includes a control device, the control device controls the opening and closing of the side door of the chamber body; a motor for the rotation of the pulley, the motor is electrically connected with 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 connected with the control device The device is electrically connected, and when the pump body is activated, the fluid wax is sent into the wax mold workshop from the wax collection tank.

The beneficial effects of the present invention are:

1. The hot air dry dewaxing system consists of four parts: the mold shell fixing table, the dewaxing treatment chamber, the burning chamber, and the wax collecting tank. The structure is simple and the equipment manufacturing cost is low;

2. After the fluid wax is filtered, it can be recycled and used, which reduces energy consumption;

3. In the process of dewaxing, there is no need to add hydrochloric acid for treatment, so it is pollution-free and protects the environment;

5. Since the casting products after dewaxing are not in contact with water vapor, they do not need to be dried again, which saves the cost.

Description of drawings

Fig. 1 is the structural schematic diagram of the mold shell fixing table, the dewaxing treatment chamber and the roasting furnace of the hot air dry dewaxing system according to the present invention;

Fig. 2 is the structural representation of the dewaxing treatment chamber, the roasting furnace and the wax collecting pool of the hot air dry dewaxing system according to the present invention;

FIG. 3 is a schematic structural diagram of the dewaxing treatment chamber of the hot air dry dewaxing system according to the present invention.

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

Detailed ways

The present invention will be further described below with reference to specific embodiments, but the scope of the present invention is not limited to these embodiments.

Example 1

Please refer to FIGS. 1-3. FIG. 1 is a schematic structural diagram of the mold shell fixing table, the dewaxing treatment chamber and the roasting furnace of the hot air drying dewaxing system according to the present invention; FIG. 2 is the hot air drying method according to the present invention. Schematic diagram of the structure of the dewaxing treatment chamber, the roasting furnace and the wax collecting tank of the method dewaxing system; FIG. 3 is a schematic diagram of the structure of the dewaxing treatment chamber of the hot air dry dewaxing system according to the present invention. As shown in Figure 1-3, the hot air dry dewaxing system includes: a mold shell fixing table 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 described in detail.

The mold case fixing table 1 is divided into a mold case fixing frame 11 , a first wax storage tray 12 and a moving table 13 according to its structure from top to bottom. The function of the mold case fixing frame 11 is to place the mold case (not shown). On the wax storage tray 12 , the first wax storage tray 12 is used to collect fluid wax. When the wax on the mold shell is melted, it drips into the first wax storage tray 12 . A fluid wax outlet 121, 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 wax tray 12 is placed on the moving table 13 . In order to realize the moving function, a plurality of pulleys 14 are installed under the moving table 13 , so that the mold case fixing table 1 can enter or exit the chamber body 21 through the rotation of the pulleys 14 .

In one embodiment, the mold case 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 , and the plurality of fixing bars 112 are arranged in parallel in the rectangular fixing frame 111 . The two ends of the 112 are respectively connected with the rectangular fixing frame 111 to form a plane fence structure. A plurality of mould shells are arranged between the adjacent fixing bars in sequence. The frame 111 is vertical and connected, and the bottom stands on the first wax storage tray 12 .

When the mold shell fixing table 1 is pushed out of the chamber body 21, the wax on the mold shell must have completely melted away, but there may still be part of it in the first wax storage tray 12. In order to avoid a small amount of fluid wax from The fluid wax outlet 121 of the first wax storage tray 12 flows to the ground, which is not conducive to recycling. There is also a second wax storage tray 15 beside the mold shell fixing table 1. When the mold shell fixing table 1 pushes out of the dewaxing treatment chamber 2 Afterwards, the fluid wax outlet 121 is located just above the second wax storage tray 15 .

The roasting furnace 3 is arranged near the dewaxing treatment chamber 2, and the optimal setting position is to fit the dewaxing treatment chamber 2. The roasting furnace 3 and the dewaxing treatment chamber 2 are connected through a pipeline, and a fan is arranged on this 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, and the heat obtained by the roasting furnace 3 is sent to the dewaxing treatment chamber 2 through the fan and the pipeline , used to increase the temperature of the dewaxing treatment chamber 2 to achieve the purpose of melting the wax on the mold shell.

The dewaxing treatment chamber 2 is divided into four parts according to functions. The first part is the chamber body 21 used to provide accommodation space for the mold case fixing table 1; The third part is a transfer pipe 22, a plurality of heat dissipation pipes 23 and an exhaust port 24 for transferring heat; the fourth part is a wax discharge port 25 for discharging fluid wax; the transfer pipe 22 and a plurality of heat dissipation pipes 23 are It is arranged on the inner wall of the chamber body 21, and the conveying pipe 22 is attached to the side wall of the side close to the roasting furnace 3. One end of the conveying pipe 22 is connected to the air outlet of the fan, and is used to send 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 other heat dissipation pipes 23 can be connected end to end with this heat dissipation pipe 23, or can be directly connected with the transmission pipe 22 to obtain heat transmission. Multiple heat dissipation pipes 23 are respectively located on the three side walls and one top wall of the chamber body 21, and each radiating pipe 23 is provided with a plurality of radiating ports 27. When the case fixing table 1 is placed in the chamber body 21 , the plurality of heat dissipation ports 27 are all facing the mold case. 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 decreases and is discharged from the exhaust port 24 at the top of the chamber body 21 to the outside atmosphere. Low temperature, without too much heat loss, little impact on the outside temperature or environment, and no other bad components in the hot air, no pollution to the environment. The wax discharge port 25 is located at the bottom of one side wall of the chamber body 21. After the mold shell fixing table 1 is pushed into the dewaxing treatment chamber 2, the fluid wax outlet 121 is located directly above the wax discharge port 25. The fluid wax discharged from 121 is discharged to the outside through the wax discharge port 25 . A plurality of rails 26 are arranged on the inner floor of the chamber body 21 to facilitate mutual cooperation with the pulleys 14 of the mold case fixing table 1 and play a limiting role after the mold case fixing table 1 enters the chamber body 21 to avoid contact with touch or damage the heat pipe 23 of the side wall.

The wax collection tank 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 collection tank 4. The fluid wax enters the wax collection tank 4 from the wax discharge port 25 through the wax discharge channel 28. . The wax collecting pool 4 is divided into three filtering sub-pools, therefore, it 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 43 The filter sub-pool 42 and the third filter sub-pool 43 are arranged in sequence, and the fluid wax passes through the first filter sub-pool 41, the second filter sub-pool 42 and the third filter sub-pool 43 in turn, and is used between the adjacent two filter sub-pools. The closed clapboard is separated, and a filter screen is arranged at the bottom of the clapboard to pass through the two adjacent filter sub-pools. Therefore, a first partition is provided between the first filter sub-pool 41 and the second filter sub-pool 42 Plate 44, a first filter screen (not shown) is embedded on the first partition plate 44, a second partition plate 45 is arranged between the second filter sub-pool 42 and the third filter sub-pool 43, and the second partition plate 45 A second filter screen (not shown) is embedded on the top, and a filter basket 46 is arranged in the first filter sub-pool 41. The basket wall of the filter basket 46 is composed of a third filter screen (not shown). The filter basket 46 can be directly Take out from the first filter sub-pool 41, one end of the wax discharge channel 28 is located above the filter basket 46, and the fluid wax from the wax discharge channel 28 passes through the first filter sub-pool 41, the second filter sub-pool 42 and the third filter in sequence. The sub-pool 43 and the third filtering sub-pool 43 lead to the wax mold workshop (not shown) through the pipeline, and a pump body 47 for extracting the fluid wax is arranged on the pipeline, so that the fluid can be quickly recovered from the wax collecting pool 4 wax. 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.

In order to make the above hot air dry dewaxing system more convenient and mechanized, it also includes a control device (not shown), the control device 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 rotation of the driving pulley 14 The motor (not shown), when the motor starts, the mold shell fixing table 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 starts, the fluid wax The self-collecting wax pool 4 is sent into the wax mold workshop.

The working principle of the hot air dry dewaxing system will be introduced in the following: First, place the mold shell fixing table 1 on the furnace table and install it upside down, and fix it with angle iron, open the side door of the chamber body 21 through the control device, and open the motor through the control device. The mold case fixing table 1 is pushed into the chamber body 21, the side door of the chamber body 21 is closed by the control device, the temperature of the roasting furnace 3 is set to 240°C, and then ignited; about 8 minutes later, the mold case on the mold case fixing table 1 begins to start. Flowing fluid wax; after about 15-20 minutes, set the setting temperature to 150°C, and after about 3 hours, set the temperature to 100°C, when no fluid wax flows out of the wax discharge port 25, the heating can be stopped. The mold case is sent out from the dewaxing treatment chamber 2 . The fluid wax flowing into the wax collecting tank 4 is sent to the wax mold workshop by the pump body 47 after being filtered by the three filter sub-pools for reuse.

To sum up, in the hot air dry dewaxing system according to the present invention, the roaster fan sends the hot air to the conveying pipe, and the heat is transferred to the mold shell by the radiator pipe, which shortens the roasting time of the roaster. , from the original 8-10 hours to the current 4-5 hours, the fluid wax obtained by melting at high temperature passes through the three-layer 140-mesh filter screen, and can be reused in the wax mold workshop again, reducing energy consumption and satisfying Environmental protection requirements, saving raw materials and reducing raw material costs.

Taking the above ideal embodiments according to the present invention as inspiration, and through the above description, relevant personnel can make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the contents in the specification, and the technical scope must be determined according to the scope of the claims.

Claims (10)

1. A hot air dry dewaxing system, comprising: a mould shell fixing platform, a dewaxing treatment chamber, a roasting furnace, a fan and a wax collecting tank,

the formwork fixing table comprises a formwork fixing frame for placing a formwork, an th wax storage disc for collecting fluid wax and a mobile station, the formwork fixing frame is placed on the th wax storage disc, the th wax storage disc is placed on the mobile station, a plurality of pulleys are arranged below the mobile station,

the roasting furnace is arranged beside the dewaxing treatment chamber, the air inlet of the fan is communicated with the roasting furnace, the air outlet of the fan is communicated with the dewaxing treatment chamber,

the dewaxing treatment chamber comprises a chamber body, a conveying pipeline, a plurality of radiating pipes, an air outlet, a wax discharge port and a plurality of tracks, wherein the conveying pipeline and the plurality of radiating pipes are arranged on the inner wall of the chamber body, the end of the conveying pipeline is connected with the air outlet of the fan, the other end of the conveying pipeline is communicated with the radiating pipes, each radiating pipe is provided with a plurality of radiating ports, the radiating ports face to the central area of the chamber body, the air outlet is positioned at the top of the chamber body and is communicated with the outside, the wax discharge port is positioned at the bottom of the side wall of the chamber body, the tracks are arranged on the inner surface of the bottom of the chamber body, the tracks are matched with the pulleys, and the formwork fixing table can enter the chamber body through the rotation of the pulleys,

the wax collecting pool is positioned below the horizontal ground surface, the end of the wax discharge channel is connected with the wax discharge port, the end is positioned above the wax collecting pool, and fluid wax enters the wax collecting pool from the wax discharge port through the wax discharge channel.

2. The hot-air dry dewaxing system of claim 1, wherein the formwork holder has a rectangular fixing frame, a plurality of fixing strips and a plurality of fixing feet, the bottoms of the fixing feet stand on the th wax storage disc, the tops of the fixing feet are connected with the rectangular fixing frame, the fixing strips are arranged in the rectangular fixing frame in parallel, and two ends of the fixing strips are respectively connected with the rectangular fixing frame.

3. The hot air dry dewaxing system of claim 1, wherein:

fluid wax outlets are formed in the bottom of the wax storage disc, and when the formwork fixing table is pushed into the dewaxing processing chamber, the fluid wax outlets are located right above the wax discharge port.

4. The hot air dry dewaxing system of claim 3, wherein: the mould shell fixing station also comprises a second wax storage disc, and when the mould shell fixing station is pushed out of the dewaxing treatment chamber, the fluid wax outlet is positioned right above the second wax storage disc.

5. The hot-air dry dewaxing system of claim 3, wherein the pan on the th wax storage pan is inclined toward the outlet of the fluid wax.

6. The hot air dry dewaxing system of claim 1, wherein the chamber body has three side walls, top walls and sides , the plurality of heat pipes are respectively located on the three side walls and top walls of the chamber body, and the heat pipes located on the three side walls are communicated with each other.

7. The hot-air dry dewaxing system of claim 1, wherein the wax collecting tank comprises th, second and third filtering sub-tanks, the th, second and third filtering sub-tanks are arranged in sequence, a th partition plate is arranged between the th and second filtering sub-tanks, a th filter screen is embedded in the th partition plate, a second partition plate is arranged between the second and third filtering sub-tanks, a second filter screen is embedded in the second partition plate, a filter basket is arranged in the th filtering sub-tank, the basket wall of the filter basket consists of a third filter screen, the end of the wax discharge channel is located above the filter basket, fluid wax passes through the th, second and third filtering sub-tanks from the wax discharge channel in sequence, and the third filtering sub-tank is led to the wax pattern workshop through a pipeline.

8. The hot air dry dewaxing system of claim 7, wherein: and a pump body for pumping the fluid wax is arranged on the pipeline.

9. The hot air dry dewaxing system of claim 7, wherein the apertures of the th filter screen, the second filter screen and the third filter screen are all 140 meshes.

10. The hot air dry dewaxing system of claim 7, further comprising a control device controlling the opening and closing of the side of the chamber body, wherein the moving table is provided with a motor for driving the pulley to rotate, the motor is electrically connected with the control device, the formwork fixing table moves into or out of the dewaxing treatment chamber when the motor is started, and the pump body is electrically connected with the control device, and the fluid wax is fed into the wax formwork workshop from the wax collecting pool when the pump body is started.

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