DE212022000104U1 - Reaction device for refilling inorganic core sand with water for reuse - Google Patents

Abstract

A reaction apparatus for replenishing inorganic core sand with water for reuse, comprising a reaction tank (1), a water adding device (3), a heating device and a driving device (2), the heating device being arranged at a bottom of the reaction tank (1), the Water adding device (3) which feeds water into the interior of the reaction container (1) and wherein the drive device (2) is designed to drive the reaction container (1) to rotate.

Description

technical field

The present application relates to the technical field of molding sands for casting, such as a reaction apparatus for replenishing inorganic core sand with water for reuse and a method for reuse.

background

When casting, the inorganic binder has the advantage that it is environmentally friendly and free of pollutants. However, when the inorganic core sand (mixture of inorganic binder and foundry sand) is exposed to and comes into contact with the air, a dehydration-condensation reaction occurs in the inorganic binder. As a result, the sand sticks together, the adhesion gradually spreads toward a center, and the sand solidifies and crusts, rendering the inorganic core sand ineffective.

In the prior art, a method for treating the ineffective inorganic core sand is to treat the inorganic core sand by a method such as a mechanical method, a wet method, a combination of the mechanical method and the wet method, a combination of the mechanical method and a thermal method or to recover a combination of the thermal process with the wet process.

In the prior art, a method for recovering inorganic sand and a recovered inorganic sand are disclosed. The recovery process comprises the following steps: (1) a first mechanical treatment: a used inorganic sand is crushed so that a primarily mechanically treated sand is obtained; (2) a thermal treatment: the primarily mechanically treated sand is heated so that a thermally treated sand is obtained; (3) a second mechanical treatment: the thermally treated sand is mechanically ground so as to obtain a secondary mechanically treated sand; (4) crushed impurities in the secondary mechanically processed sand are removed so that the inorganic processed sand is obtained.

A method for recovering inorganic sand is also disclosed in the prior art. The method comprises the following steps: (1) a used inorganic sand is mechanically crushed and sieved to a particle size of less than 6 mm so that a sand A is obtained; (2) the sand A is roasted in a roasting furnace and brought to a smoldering area to be continuously roasted so that a sand B is obtained; (3) the sand B is mechanically ground at 250°C to 350°C, the temperature of the sand B is lowered, the ground fine powder is exhausted by induction air, and the heat carried by the induction air is returned for boiling roasting, so that a sand C is obtained; (4) Water is added to the sand C, the water and the sand C are mixed and stirred, then the water is separated and recycled, and the sand C is dried and cooled to obtain a recovered inorganic sand.

A method for processing inorganic sand is also disclosed in the prior art. The processing method includes the following steps: (1) a used sand is lifted through a storage tank to a metering machine, and after metering, the used sand is conveyed to a crusher; (2) the sand is crushed by the crusher, and then sifted by a screening machine, and dust is removed by a dust removal system; (3) the sand with the dust removed goes into an aeration dissolving and washing tank for two stages of aeration dissolving and washing; (4) the sand is washed by air and water, and then enters an aerated sand washing tank for two stages of aeration washing, and adhesives attached to the surface of the sand are washed so that the surface of the sand is clean; (5) the washed sand in the step (4) is conveyed into a tubular separator and a bed filter for two sand-water separations; (6) the dehydrated sand is conveyed to a dryer by a conveyor, and after drying, the sand is conveyed to a finished product container for use.

Although the processing of the ineffective inorganic core sand is disclosed in the foregoing methods for recovering the inorganic sand in the prior art, in the disclosed methods and the recovered inorganic core sand, reagents on the surface of the original inorganic core sand are damaged, and before reuse, the recovered inorganic core sand may be re-coated with the inorganic binder, affecting the reuse of the inorganic core sand.

Summary

The present application provides a reaction apparatus for refilling inorganic core sand with water for reuse and a method for reuse, which can restore the performance of ineffective inorganic core sand for reuse, which avoids the waste of the binder and the additive, and which also has a long-term Storage of the inorganic core sand can perform.

In a first aspect, an embodiment of the present application provides a reaction apparatus for refilling inorganic core sand with water for reuse. The reaction device has a reaction container, a water adding device, a heating device and a driving device, wherein the heating device is arranged at the bottom of the reaction container, wherein the water adding device supplies the water into the interior of the reaction container and wherein the driving device is designed to drive the reaction container to rotate .

In a second aspect, an embodiment of the present application provides a method for reusing inorganic core sand, which is carried out by the reaction apparatus for refilling inorganic core sand with water for reuse provided in the first aspect.

Brief description of the drawings

• The 1 14 is a structural view of a reaction apparatus for replenishing inorganic core sand with water for reuse according to Embodiment 1 of the present application.
• The 2 12 is a schematic view of specific components of the reaction apparatus for replenishing inorganic core sand with water for reuse according to Embodiment 1 of the present application.
• The 3 12 is a schematic view of a sealing cap according to Embodiment 1 of the present application.
• The 4 12 is a schematic view of a worm gear according to Embodiment 1 of the present application.
• The 5 12 is a schematic view of a part of the components of a reaction device according to Embodiment 1 of the present application.

List of References

1

reaction vessel

11

sealing cover

2

drive device

2-1

engine

2-2

transmission

2-3

roller

2-4

worm drive

2-5

snail wings

3

water addition device

3-1

water pump

3-2

water supply line

3-3

atomizing device

3-4

Device for determining the water content of inorganic core sand

4

Deflection device for sand discharge

5

support device

6-1

hotplate

6-2

outer frame

7

control switch

8th

Limiting element for the reaction vessel

Detailed description

In order to demonstrate the effectiveness of a method for reuse described in the present application, the same inorganic core sand as in the present application is used as an inorganic core sand, and a method for producing the inorganic core sand is described below.

8 kg of quartz sand is put in a sand mixer, then 68 g of additives are added in the sand mixer, and finally 160 g of inorganic binder is added. The quartz sand, the additives and the inorganic binder are mixed in such a way that the inorganic core sand is formed.

Example 1

This embodiment provides a reaction apparatus for replenishing inorganic core sand with water for reuse as disclosed in FIGS 1 until 5 is shown. The reaction device for replenishing inorganic core sand with water for reuse comprises a reaction tank 1, a heater, a driving device 2 and a water adding device 3, the heating device being arranged at the bottom of the reaction tank 1, the driving device 2 being configured to rotate the reaction tank 1 to be driven to rotate, and the water adding device 3 is designed to add an appropriate amount of water to the reaction vessel 1.

The heating device comprises a heating plate 6-1 and an outer frame 6-2, the outer frame 6-2 being configured to fix the heating plate 6-1, and the heating plate 6-1 being an electromagnetic heating plate.

The heating plate 6-1 provided in this embodiment uses an electromagnetic heater and can be intelligently adjusted according to a temperature detected by a temperature sensor. Alternatively, the heating plate 6-1 can also be a resistance heater. The material selection of the heating plate is not limited in this embodiment, and a material of the heating plate can be adopted as long as the material can satisfy the condition that heat is supplied to the reaction container 1 .

The driving device 2 has a roller drive and a worm drive 2-4, the roller drive having a motor 2-1, a gear 2-2 and a roller 2-3 connected in series, and having a rubber layer on the surface of the roller 2-3 is arranged.

An object of arranging the rubber layer on the surface of the roller 2-3 in this embodiment is to increase the coefficient of friction between the reaction container 1 and the roller 2-3 so that the reaction container 1 is driven to rotate by friction.

In the roller drive provided in this embodiment, the motor 2-1 drives the gear 2-2 to rotate, and then the roller 2-3 is driven to rotate. The contact surface between the reaction vessel 1 and the roller 2-3 has a relatively high coefficient of friction. The reaction container 1 is rotated by a large frictional force so that the sand in the reaction container 1 rolls up and down and a stirring function is performed.

Like in the 4 is shown, the screw drive 2-4 has a screw blade 2-5, which is arranged in the reaction vessel 1. If the drive of the roller 2-3 is not off due to a malfunction can be guided, the screw drive 2-4 can also perform the function of stirring the inorganic core sand in the reaction vessel 1.

Like in the 3 1, a sealing lid 11 is arranged at one end of the reaction vessel 1. As shown in FIG. An object of the sealing lid 11 provided in this embodiment is to ensure that a closed environment is maintained in the reaction vessel 1 during the sand mixing process to ensure that a water absorption reaction proceeds.

The reaction container 1 also has a deflection device 4 for the sand discharge, which is arranged on a side of the reaction container 1 facing the sealing cover 11 . The sand discharge deflector 4 described in this embodiment is designed to collect the inorganic core sand after the reaction. When the sand is taken out, the sand in the reaction tank 1 slides down along the sand discharge deflector 4, thereby facilitating the taking out and saving labor.

As in the 2 and 5 As shown, the water adding device 3 comprises a water pump 3-1 and a water supply pipe 3-2 connected in series, the outlet of the water supply pipe 3-2 being arranged in the reaction tank 1, and an atomizing device 3-3 the outlet of the water supply pipe 3-2.

The reaction device further comprises a support device 5, a control switch 7 and a limiting member 8 for the reaction container. The support device 5 is designed to support the reaction container 1 . The control switch 7 is designed to control the operation of the heating device, the driving device 2 and the water adding device 3 . The restricting member 8 of the reaction cylinder is designed to prevent the reaction container 1 from shaking from side to side, thereby improving the stability of the stirring operation.

Like in the 5 1, the water adding device 3 further has a device 3-4 for detecting the water content of the inorganic core sand. In this embodiment, the amount of water to be filled in the reaction tank 1 is determined according to the water content supplied from the device 3-4 for detecting the water content of the inorganic core sand.

The water pump 3-1 in this embodiment is designed to control the time and amount of water to be added. The amount of water to be filled into the reaction container 1 is calculated using a numerical value determined by a water content detector. The calculation formula is that the amount of water to be supplied is equal to the weight of the inorganic core sand multiplied by the difference between a set water content and a determined water content. If the determined water content is not less than 1.6%, no water needs to be added. A purpose of adding water to the reaction vessel 1 is to replenish the water required for the reaction so that the water content of the reaction environment is improved.

Example 2

This embodiment provides a reaction device for replenishing inorganic core sand with water for reuse, and the reaction device differs from that in embodiment 1 only in that the water adding device is omitted from this embodiment.

Comparative example 1

This comparative example provides a reaction device for replenishing inorganic core sand with water for reuse, and the reaction device differs from that in Embodiment 1 only in that the heating device is omitted in this comparative example.

Application example 1

This application example provides a water absorption reaction of inorganic core sand provided by the reaction apparatus for replenishing water into inorganic core sand for the Reuse according to the embodiment 1 is performed. A method for reusing is described below.

An ineffective inorganic core sand is mixed with water at a solid-liquid ratio of 1000 to 10 in the reaction vessel, and then the water absorption reaction is carried out for 60 minutes at a rotation speed of 60 rpm and a temperature of 30 °C so that an inorganic core sand with restored functions is obtained.

The reuse method provided in the present application also includes post-processing. The post-processing includes sand extraction and sand collection in a sealed manner, which are carried out sequentially. The sand extraction method is to press a sand extraction button to cause the motor to rotate backwards so that a screw structure in the reaction tank causes the sand to roll out. The extracted inorganic core sand is put into a sealed bag for storage.

In one embodiment, the solid-to-liquid ratio of the inert inorganic core sand to water is 1000 to 1 to 12. The solid-to-liquid ratio may be, for example, 1000 to 1, 1000 to 2, 1000 to 3, 1000 to 4, 1000 to 5, 1000 by 6, 1000 by 7, 1000 by 8, 1000 by 9, 1000 by 10, 1000 by 11, or 1000 by 12. However, the solid-liquid ratio is not limited to the numerical values listed, and other numerical values within the numerical range that have not been listed are also applicable.

In one embodiment, the agitation speed is 60 rpm to 200 rpm. For example, the stirring speed may be 60 rpm, 80 rpm, 100 rpm, 120 rpm, 140 rpm, 160 rpm, 180 rpm or 200 rpm. However, the stirring speed is not limited to the numerical values listed, and other numerical values within the numerical range which have not been listed are also applicable.

The water absorption reaction temperature is 20°C to 70°C. For example, the water absorption reaction temperature may be 20°C, 30°C, 40°C, 50°C, 60°C, or 70°C. However, the water absorption reaction temperature is not limited to the listed numerical values, and other numerical values within the numerical range which have not been listed are also applicable.

In one embodiment, the water absorption reaction time is 10 minutes to 60 minutes. The water absorption reaction time may be, for example, 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes or 60 minutes. However, the water absorption reaction time is not limited to the numerical values listed, and other numerical values within the numerical range which have not been listed are also applicable.

In this embodiment, regarding the solid-liquid ratio of the ineffective inorganic core sand to water, a specific amount of water to be supplied is calculated according to the water content of the inorganic core sand.

Each numerical range described in the present application includes not only the point values listed above, but also any point values within the numerical range that are not listed. For reasons of space and simplicity, certain point values included in the range are not exhaustively listed in this embodiment.

The ineffective inorganic core sand described in this application example refers to an inorganic core sand which has been exposed to an environment of high temperature and low humidity for 40 minutes, where a large amount of ineffective inorganic core sand has been solidified and crusted.

A performance test is carried out on the inorganic core sand whose functions have been restored; the results are shown in Table 1.

Application example 2

This application example provides a water absorption reaction of inorganic core sand performed by the reaction apparatus for replenishing inorganic core sand with water for reuse as provided in Embodiment 2. A procedure for reuse is described below. An ineffective inorganic core sand is placed in the reaction vessel, and the water absorption reaction is carried out for 60 minutes at a rotation speed of 60 rpm and a temperature of 30°C, so that an inorganic core sand with restored functions is obtained.

The ineffective inorganic core sand described in this application example refers to an inorganic core sand that has been stored for 40 minutes in a high-temperature and low-humidity environment, with a large amount of the ineffective inorganic core sand being solidified and crusted.

The function-restored inorganic core sand is subjected to a performance test and the results are shown in Table 1.

In one embodiment, the method for recycling inorganic core sand includes the steps described below. The ineffective inorganic core sand is mixed with water at a solid-liquid ratio of 1000 to 1 to 12 in the reaction vessel, and then the water absorption reaction is carried out for 5 minutes to 60 minutes at a rotation speed of 60 rpm to 200 rpm and a temperature of 20°C to 70°C so that the inorganic core sand with the restored functions is obtained.

blank control

This application example provides an ineffective, inorganic core sand. The ineffective inorganic core sand refers to an inorganic core sand that has been stored for 40 minutes in a high-temperature and low-humidity environment with a large amount of ineffective inorganic core sand solidified and crusted. Table 1 Experimental Environment temperature: 36.4 °C; Humidity: 16.4% RH Application example 1 Application example 2 blank control Relativity of the flowability of the inorganic core sand / % 81.5 80.5 Severe crusting occurred after 30 minutes, and the thickness of the crusting was about 6 mm to 8 mm, resulting in the performance test being unable to be performed 4H Tensile Strength Relativity / % 88.2 79.0 4H flexural strength relativity / % 79.8 67.9 Degree of encrustation of the inorganic core sand incrustation disappeared incrustation disappeared

Relativity refers to the relationship between the performance under this condition and the original performance of the inorganic core sand. A higher percentage means that the performance of the inorganic core sand is better.

It can be seen from Table 1 that according to the method for reuse of the present application, the water absorption reaction can be performed on the ineffective inorganic core sand so that the inorganic core sand that has not fully solidified is restored to more than 80% of the original performance and it can still be used to craft cores.

In summary, the reaction apparatus for replenishing inorganic core sand with water for reuse provided by the present application has a simple structure, is easy to operate, and promotes industrial production and application. The reaction vessel 1 is a sealed device, and the core inorganic sand, which had incompletely solidified is placed in an airtight room and continuously stirred for a period of time after the reaction container 1 is sealed, whereby the temperature in the airtight room is improved and the reaction rate is increased. By the reuse method of the present application, the performance of the ineffective inorganic core sand can be recovered for reuse, the waste of the binder and additives is avoided, and the long-term storage of the inorganic core sand can also be realized.

Claims (6)

A reaction apparatus for replenishing inorganic core sand with water for reuse, comprising a reaction tank (1), a water adding device (3), a heating device and a driving device (2), the heating device being arranged at a bottom of the reaction tank (1), the Water adding device (3) which feeds water into the interior of the reaction container (1) and wherein the drive device (2) is designed to drive the reaction container (1) to rotate. Reaction device for refilling inorganic core sand with water for reuse according to claim 1 , wherein the heating device has a temperature sensor, a heating plate (6-1) and an outer frame (6-2), wherein the temperature sensor is designed to detect a temperature in the reaction vessel (1), and wherein the outer frame (6 -2) is designed to attach the heating plate (6-1). Reaction device for refilling inorganic core sand with water for reuse claim 1 or 2 , wherein the drive device (2) has at least one roller drive or a worm drive, wherein the roller drive has a motor (2-1), a gear (2-2) and a roller (2-3) which are connected to one another in series, wherein a rubber layer is arranged on a surface of the roller (2-3), and wherein the screw drive comprises a screw blade (2-4) arranged in the reaction vessel (1). Reaction device for refilling inorganic core sand with water for reuse according to claim 3 , wherein a sealing cover (11) is arranged at one end of the reaction container (1) and wherein the reaction container (1) also has a deflection device (4) for sand discharge, which is located on a side of the reaction container (1) facing the sealing cover (11). is arranged. Reaction apparatus for replenishing inorganic core sand with water for reuse according to any one of Claims 1 until 4 , wherein the water adding device (3) has a device (3-4) for detecting a water content of the inorganic core sand, an atomizing device (3-3) and a water pump (3-1) and a water supply pipe, which are connected to each other in series, wherein an outlet of the water supply line is arranged in the reaction vessel (1), and wherein the atomizing device (3-3) is arranged at the outlet of the water supply line. Reaction apparatus for replenishing inorganic core sand with water for reuse according to any one of Claims 1 until 5 , which further comprises a support device (5) and a control switch (6-2), wherein the support device (5) is designed to support the reaction container (1), and wherein the control switch (6-2) is designed to the To control operation of the heating device, the drive device (2) and the water addition device (3).

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