Sulfur dioxide gasifier, generator, sand core hardening device for sand core hardening

Abstract

The utility model relates to a kind of for sulfur dioxide gasifier, generator, sand core hardening device, specifically to sand core hardening field, to solve the defect that the gas blowing pressure and time deficiency possibly caused by steel bottle gas supply possibly lead to sand core hardening insufficient, and excessive pressure or time is too long possibly cause sand core surface overburning or waste gas, the sulfur dioxide gasifier for sand core hardening includes: the heating band and heating pipe are configured in the sulfur dioxide gasifier;Temperature sensor and pressure sensor are configured on the surface of the sulfur dioxide gasifier.The sulfur dioxide gasifier provided by the utility model, by adopting the sulfur dioxide gasifier of the heating band and heating pipe configuration, the constant pressure constant temperature gas supply of sulfur dioxide gas used in sand core hardening is realized, is conducive to guarantee the operation stability of sand core hardening, guarantee the sand core product obtained has good use performance.

Description

Technical Field

[0001] This utility model relates to the field of sand core hardening, specifically to a sulfur dioxide generator and a sand core hardening device for sand core hardening. Background Technology

[0002] The sulfur dioxide blowing hardening cold core box method involves first filling a core box with raw sand mixed with binder and catalyst (organic peroxide), and then blowing sulfur dioxide gas at a certain pressure and flow rate into the core box through an air blowing device. The gas diffuses in the sand core, causing the binder to undergo a curing reaction, thereby hardening the sand core. Therefore, the sulfur dioxide process requires control of the blowing pressure and flow rate of sulfur dioxide.

[0003] Currently, gas cylinders are typically used as the gas source for supply, but direct gas supply has the following drawbacks:

[0004] 1. Gas supply from gas cylinders may result in insufficient blowing pressure and time, which may lead to inadequate hardening of the sand core. On the other hand, excessive pressure or time may cause over-burning of the sand core surface or waste of gas.

[0005] 2. If the pressure inside the sulfur dioxide storage tank is too high, it will liquefy, posing a risk of corrosion and tank rupture.

[0006] 3. Sulfur dioxide storage tanks cannot effectively insulate against heat, and liquid sulfur dioxide may be present inside the tank.

[0007] Based on the above-mentioned defects, this utility model proposes a sulfur dioxide gasifier, generator, and sand core hardening device for sand core hardening, in order to solve the defects that insufficient blowing pressure and time may lead to insufficient sand core hardening due to gas cylinder supply, while excessive pressure or time may cause over-burning of the sand core surface or waste of gas. Utility Model Content

[0008] In view of the problems existing in the prior art, the purpose of this utility model is to provide a sulfur dioxide gasifier, generator and sand core hardening device for sand core hardening, so as to solve the defects that insufficient blowing pressure and time may lead to insufficient sand core hardening due to gas cylinder supply, while excessive pressure or time may cause over-burning of sand core surface or waste of gas.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] In a first aspect, this utility model provides a sulfur dioxide gasifier for sand core hardening, the sulfur dioxide gasifier for sand core hardening comprising:

[0011] The sulfur dioxide vaporizer is equipped with a heat tracing cable and a heating pipe.

[0012] Temperature and pressure sensors are mounted on the surface of the sulfur dioxide gasifier.

[0013] The sulfur dioxide gasifier provided by this utility model, by adopting a sulfur dioxide gasifier equipped with a heat tracing cable and a heating pipe, achieves constant pressure and temperature gas supply for sulfur dioxide gas used in sand core hardening, which helps to ensure the operational stability of sand core hardening and ensures that the obtained sand core products have good performance.

[0014] As a preferred technical solution of this utility model, the sulfur dioxide gasifier is equipped with a heat insulation layer, a pressure relief valve, a pressure gauge and a thermometer;

[0015] The bottom of the sulfur dioxide vaporizer is provided with a sulfur dioxide inlet.

[0016] The sulfur dioxide gasifier is provided with a sulfur dioxide outlet at the top.

[0017] As a preferred technical solution of this utility model, at least three heating tubes are arranged perpendicular to the axial direction of the sulfur dioxide gasifier.

[0018] As a preferred technical solution of this utility model, the heat tracing cable is spirally arranged along the axial direction of the sulfur dioxide gasifier;

[0019] The spacing between adjacent heat tracing cables is 6-7% of the height of the sulfur dioxide vaporizer.

[0020] As a preferred technical solution of this utility model, the heat tracing cable, heating tube, temperature sensor and pressure sensor are connected to the control center.

[0021] Secondly, this utility model provides a sulfur dioxide generator for sand core hardening, the sulfur dioxide generator comprising: a cabinet, a heater disposed in the cabinet, and a sulfur dioxide gasifier for sand core hardening as described in the first aspect.

[0022] The heater is connected to the sulfur dioxide gasifier used for hardening sand cores.

[0023] As a preferred technical solution of this utility model, the cabinet is provided with an exhaust gas interface connected to the sulfur dioxide gasifier used for sand core hardening.

[0024] The outlet of the sulfur dioxide gasifier used for sand core hardening is connected to the exhaust gas interface;

[0025] The cabinet is equipped with a sulfur dioxide gas inlet.

[0026] The sulfur dioxide gas inlet is connected to the inlet of the sulfur dioxide gasifier used for sand core hardening.

[0027] As a preferred technical solution of this utility model, the cabinet is equipped with an electrical control area and a gas valve area;

[0028] The valve area is equipped with a compressed gas inlet.

[0029] The compressed gas inlet is connected to the sulfur dioxide gasifier used for sand core hardening via a gas valve area.

[0030] Thirdly, this utility model provides a sand core hardening device, which includes: a sulfur dioxide generator for sand core hardening as described in the second aspect.

[0031] As a preferred technical solution of this utility model, the sand core hardening device further includes: a core-making machine;

[0032] The core box of the core-making machine is connected to the sulfur dioxide generator used for core hardening.

[0033] Compared with existing technical solutions, this utility model has the following beneficial effects:

[0034] (1) The sulfur dioxide gasifier provided by this utility model can realize the storage and pressure control of gas SO2. At the same time, the heating and heat preservation of the pressure vessel are achieved by using a heat tracing cable and a heating pipe to solve the problem of quantitative SO2 blowing under the set pressure conditions. Furthermore, the heating of SO2 is further stabilized by configuring a heater.

[0035] (2) The sulfur dioxide generator provided by this utility model can be intelligently controlled through an independent control center and can be adapted to SO2 core making machines of different specifications. Attached Figure Description

[0036] Figure 1 This is an internal schematic diagram of the sulfur dioxide gasifier in a sulfur dioxide generator for sand core hardening provided by an embodiment of the present invention;

[0037] Figure 2 This is an isometric view of the sulfur dioxide gasifier in a sulfur dioxide generator for sand core hardening provided by an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of a sulfur dioxide generator for hardening sand cores provided in an embodiment of the present invention;

[0039] In the diagram: 100-sulfur dioxide vaporizer, 110-heating tube, 120-heating tape, 130-temperature sensor, 140-pressure sensor, 150-insulation layer, 160-pressure relief valve, 170-pressure gauge, 180-thermometer.

[0040] 210-Cabinet, 220-Heater, 230-Exhaust gas inlet, 240-Sulfur dioxide gas inlet, 250-Electrical control area, 260-Gas valve area, 261-Compressed gas inlet.

[0041] The present invention will now be described in further detail. However, the examples described below are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be determined by the claims. Detailed Implementation

[0042] To better illustrate this utility model and facilitate understanding of its technical solution, typical but non-limiting embodiments of this utility model are as follows:

[0043] Currently, sulfur dioxide is supplied from gas cylinders during sand core blowing hardening. However, pressure fluctuations during this process hinder efficient hardening. Therefore, this invention provides a sulfur dioxide vaporizer for sand core hardening. This addresses the shortcomings of cylinder-supply, which can lead to insufficient hardening due to insufficient blowing pressure and time, while excessive pressure or time can cause overheating of the sand core surface or waste of gas. Specifically:

[0044] I. This embodiment provides a sulfur dioxide gasifier for sand core hardening, such as... Figure 1 He Ru Figure 2 As shown, the sulfur dioxide gasifier for sand core hardening includes:

[0045] The sulfur dioxide vaporizer 100 is equipped with a heat tracing cable 120 and a heating tube 110.

[0046] Temperature sensor 130 and pressure sensor 140 are configured on the surface of the sulfur dioxide vaporizer 100.

[0047] In this utility model, the sulfur dioxide gasifier 100 can be selected as a gas bag, gas tank, or other equipment with gas storage function.

[0048] The sulfur dioxide gasifier 100 is equipped with a heat insulation layer 150.

[0049] In this invention, the insulation layer is prepared using commonly used insulation materials in the field. Specifically, commercially available products or materials prepared according to existing technologies can be selected, such as polyurethane foam, EPS, XPS, phenolic foam, etc., or inorganic materials such as ceramic fiber blanket, aluminum silicate felt, alumina, silicon carbide fiber, aerogel felt, glass wool, rock wool, expanded perlite, etc.

[0050] The sulfur dioxide vaporizer 100 is equipped with a pressure relief valve 160.

[0051] The sulfur dioxide vaporizer 100 is equipped with a pressure gauge 170 and a thermometer 180.

[0052] The sulfur dioxide vaporizer 100 is provided with a sulfur dioxide inlet at its bottom.

[0053] The sulfur dioxide gasifier 100 is provided with a sulfur dioxide outlet at its top.

[0054] Among them, at least three heating tubes 110 are arranged perpendicular to the axial direction of the sulfur dioxide gasifier 100. For example, there may be three, four, five, six, seven or eight, but it is not limited to the listed values. Other unlisted values ​​within this range also meet the requirements.

[0055] In this invention, the heating tubes 110 are arranged at equal intervals along the axial direction of the sulfur dioxide gasifier 100.

[0056] The heat tracing cable 120 is spirally arranged along the axial direction of the sulfur dioxide vaporizer 100.

[0057] The spacing between adjacent heat tracing cables 120 is 6-7% of the height of the sulfur dioxide vaporizer 100, for example, it can be 6%, 6.1%, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8%, 6.9% or 7%, but is not limited to the listed values. Other unlisted values ​​within this range are also acceptable.

[0058] The heat tracing cable 120, heating tube 110, temperature sensor 130 and pressure sensor 140 are connected to the control center.

[0059] In this utility model, the sulfur dioxide vaporizer 100, heater, and control center can be integrated and assembled in a cabinet, dividing different functional areas. It features independent electrical control, gas control, and air heating functions, with clear functional zoning. This meets CE certification requirements. The independent electrical control approach, combined with the overall functional design, allows for flexible layout and adaptability to different models, as detailed below:

[0060] II. This embodiment provides a sulfur dioxide generator for sand core hardening, such as... Figure 3 As shown, the sulfur dioxide generator includes: a cabinet 210, a sulfur dioxide gasifier and a heater 220 for hardening sand cores, which are disposed in the cabinet.

[0061] The heater 220 is connected to the sulfur dioxide gasifier used for hardening sand cores.

[0062] The cabinet 210 is provided with an exhaust gas interface 230 that is connected to the sulfur dioxide gasifier used for sand core hardening.

[0063] The outlet of the sulfur dioxide gasifier used for sand core hardening is connected to the exhaust gas interface 230.

[0064] The cabinet 210 is equipped with a sulfur dioxide gas inlet 240.

[0065] The sulfur dioxide gas inlet 240 is connected to the inlet of the sulfur dioxide gasifier used for sand core hardening.

[0066] The cabinet 210 is equipped with an electrical control area 250 and an air valve area 260.

[0067] The valve area 260 is equipped with a compressed gas inlet end 261.

[0068] The compressed gas inlet 261 is connected to the sulfur dioxide gasifier used for sand core hardening via the gas valve area 260.

[0069] The sulfur dioxide generator can be equipped with a cleaning circuit and a leak detection function to avoid leaks caused by pipeline disconnection during manual replacement, and can also be connected to a gas cylinder.

[0070] III. This utility model provides a sand core hardening device, which includes: a sulfur dioxide generator for sand core hardening.

[0071] The core hardening device further includes: a core-making machine;

[0072] The core box of the core-making machine is connected to the sulfur dioxide generator used for core hardening.

[0073] IV. To illustrate the effect that the sulfur dioxide generator for sand core hardening provided by this utility model can achieve when performing sand core blowing hardening, the following example is used for illustrative purposes:

[0074] Example 1

[0075] This embodiment provides a sulfur dioxide generator for sand core hardening, the sulfur dioxide generator for sand core hardening comprising:

[0076] Cabinet 210, and sulfur dioxide gasifier and heater 220 for sand core hardening are installed inside the cabinet;

[0077] The heater 220 is connected to the sulfur dioxide gasifier used for hardening sand cores;

[0078] The cabinet 210 is provided with an exhaust gas interface 230 connected to the sulfur dioxide gasifier used for sand core hardening.

[0079] The outlet of the sulfur dioxide gasifier used for sand core hardening is connected to the exhaust gas interface 230.

[0080] The cabinet 210 is equipped with a sulfur dioxide gas inlet 240;

[0081] The sulfur dioxide gas inlet 240 is connected to the inlet of the sulfur dioxide gasifier used for sand core hardening.

[0082] The cabinet 210 is equipped with an electrical control area 250 and a gas valve area 260.

[0083] The valve area 260 is equipped with a compressed gas inlet end 261;

[0084] The compressed gas inlet 261 is connected to the sulfur dioxide gasifier used for sand core hardening through the gas valve area 260.

[0085] The sulfur dioxide gasifier for hardening sand cores includes: a heating cable 120 and a heating tube 110 disposed inside the sulfur dioxide gasifier 100.

[0086] A temperature sensor 130 and a pressure sensor 140 are disposed on the surface of the sulfur dioxide vaporizer 100;

[0087] The sulfur dioxide vaporizer 100 is equipped with an insulation layer 150, a pressure relief valve 160, a pressure gauge 170, and a thermometer 180.

[0088] The sulfur dioxide vaporizer 100 is provided with a sulfur dioxide inlet at the bottom and a sulfur dioxide outlet at the top.

[0089] The heating tubes 110 are arranged at equal intervals perpendicular to the axial direction of the sulfur dioxide gasifier 100;

[0090] The heat tracing cable 120 is spirally arranged along the axial direction of the sulfur dioxide vaporizer 100, and the spacing between adjacent heat tracing cables 120 is 6.5% of the height of the sulfur dioxide vaporizer 100;

[0091] The heat tracing cable 120, heating tube 110, temperature sensor 130, and pressure sensor 140 are connected to the control center.

[0092] Example 2

[0093] This embodiment provides a sulfur dioxide generator for sand core hardening, the sulfur dioxide generator for sand core hardening comprising:

[0094] Cabinet 210, and sulfur dioxide gasifier and heater 220 for sand core hardening are installed inside the cabinet;

[0095] The heater 220 is connected to the sulfur dioxide gasifier used for hardening sand cores;

[0096] The cabinet 210 is provided with an exhaust gas interface 230 connected to the sulfur dioxide gasifier used for sand core hardening.

[0097] The outlet of the sulfur dioxide gasifier used for sand core hardening is connected to the exhaust gas interface 230.

[0098] The cabinet 210 is equipped with a sulfur dioxide gas inlet 240;

[0099] The sulfur dioxide gas inlet 240 is connected to the inlet of the sulfur dioxide gasifier used for sand core hardening.

[0100] The cabinet 210 is equipped with an electrical control area 250 and a gas valve area 260.

[0101] The valve area 260 is equipped with a compressed gas inlet end 261;

[0102] The compressed gas inlet 261 is connected to the sulfur dioxide gasifier used for sand core hardening through the gas valve area 260.

[0103] The sulfur dioxide gasifier for hardening sand cores includes: a heating cable 120 and a heating tube 110 disposed inside the sulfur dioxide gasifier 100.

[0104] A temperature sensor 130 and a pressure sensor 140 are disposed on the surface of the sulfur dioxide vaporizer 100;

[0105] The sulfur dioxide vaporizer 100 is equipped with an insulation layer 150, a pressure relief valve 160, a pressure gauge 170, and a thermometer 180.

[0106] The sulfur dioxide vaporizer 100 is provided with a sulfur dioxide inlet at the bottom and a sulfur dioxide outlet at the top.

[0107] Four heating tubes 110 are arranged at equal intervals perpendicular to the axial direction of the sulfur dioxide gasifier 100;

[0108] The heat tracing cable 120 is spirally arranged along the axial direction of the sulfur dioxide vaporizer 100, and the spacing between adjacent heat tracing cables 120 is 6% of the height of the sulfur dioxide vaporizer 100;

[0109] The heat tracing cable 120, heating tube 110, temperature sensor 130, and pressure sensor 140 are connected to the control center.

[0110] Example 3

[0111] This embodiment provides a sulfur dioxide generator for sand core hardening, the sulfur dioxide generator for sand core hardening comprising:

[0112] Cabinet 210, and sulfur dioxide gasifier and heater 220 for sand core hardening are installed inside the cabinet;

[0113] The heater 220 is connected to the sulfur dioxide gasifier used for hardening sand cores;

[0114] The cabinet 210 is provided with an exhaust gas interface 230 connected to the sulfur dioxide gasifier used for sand core hardening.

[0115] The outlet of the sulfur dioxide gasifier used for sand core hardening is connected to the exhaust gas interface 230.

[0116] The cabinet 210 is equipped with a sulfur dioxide gas inlet 240;

[0117] The sulfur dioxide gas inlet 240 is connected to the inlet of the sulfur dioxide gasifier used for sand core hardening.

[0118] The cabinet 210 is equipped with an electrical control area 250 and a gas valve area 260.

[0119] The valve area 260 is equipped with a compressed gas inlet end 261;

[0120] The compressed gas inlet 261 is connected to the sulfur dioxide gasifier used for sand core hardening through the gas valve area 260.

[0121] The sulfur dioxide gasifier for hardening sand cores includes: a heating cable 120 and a heating tube 110 disposed inside the sulfur dioxide gasifier 100.

[0122] A temperature sensor 130 and a pressure sensor 140 are disposed on the surface of the sulfur dioxide vaporizer 100;

[0123] The sulfur dioxide vaporizer 100 is equipped with an insulation layer 150, a pressure relief valve 160, a pressure gauge 170, and a thermometer 180.

[0124] The sulfur dioxide vaporizer 100 is provided with a sulfur dioxide inlet at the bottom and a sulfur dioxide outlet at the top.

[0125] Five heating tubes 110 are arranged at equal intervals perpendicular to the axial direction of the sulfur dioxide gasifier 100;

[0126] The heat tracing cable 120 is spirally arranged along the axial direction of the sulfur dioxide vaporizer 100, and the spacing between adjacent heat tracing cables 120 is 7% of the height of the sulfur dioxide vaporizer 100;

[0127] The heat tracing cable 120, heating tube 110, temperature sensor 130, and pressure sensor 140 are connected to the control center.

[0128] Example 4

[0129] This embodiment provides a sulfur dioxide generator for sand core hardening, the sulfur dioxide generator for sand core hardening comprising:

[0130] Cabinet 210, and sulfur dioxide gasifier and heater 220 for sand core hardening are installed inside the cabinet;

[0131] The heater 220 is connected to the sulfur dioxide gasifier used for hardening sand cores;

[0132] The cabinet 210 is provided with an exhaust gas interface 230 connected to the sulfur dioxide gasifier used for sand core hardening.

[0133] The outlet of the sulfur dioxide gasifier used for sand core hardening is connected to the exhaust gas interface 230.

[0134] The cabinet 210 is equipped with a sulfur dioxide gas inlet 240;

[0135] The sulfur dioxide gas inlet 240 is connected to the inlet of the sulfur dioxide gasifier used for sand core hardening.

[0136] The cabinet 210 is equipped with an electrical control area 250 and a gas valve area 260.

[0137] The valve area 260 is equipped with a compressed gas inlet end 261;

[0138] The compressed gas inlet 261 is connected to the sulfur dioxide gasifier used for sand core hardening through the gas valve area 260.

[0139] The sulfur dioxide gasifier for hardening sand cores includes: a heating cable 120 and a heating tube 110 disposed inside the sulfur dioxide gasifier 100.

[0140] A temperature sensor 130 and a pressure sensor 140 are disposed on the surface of the sulfur dioxide vaporizer 100;

[0141] The sulfur dioxide vaporizer 100 is equipped with an insulation layer 150, a pressure relief valve 160, a pressure gauge 170, and a thermometer 180.

[0142] The sulfur dioxide vaporizer 100 is provided with a sulfur dioxide inlet at the bottom and a sulfur dioxide outlet at the top.

[0143] The heating tubes 110 are arranged at equal intervals perpendicular to the axial direction of the sulfur dioxide gasifier 100;

[0144] The heat tracing cable 120 is spirally arranged along the axial direction of the sulfur dioxide vaporizer 100, and the spacing between adjacent heat tracing cables 120 is 6.8% of the height of the sulfur dioxide vaporizer 100;

[0145] The heat tracing cable 120, heating tube 110, temperature sensor 130, and pressure sensor 140 are connected to the control center.

[0146] The sulfur dioxide generator of the above embodiment is connected to the core box of the core-making machine and supplies sulfur dioxide. During the process, a gasifier such as a gas bag is used to store and control the pressure of gas SO2. At the same time, a heating cable and a heating pipe are used to heat and keep the pressure vessel warm. This enables the quantitative blowing of SO2 under the set pressure conditions.

[0147] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0148] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0149] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A sulfur dioxide gasifier for hardening sand cores, characterized in that, The sulfur dioxide gasifier used for sand core hardening includes: The sulfur dioxide vaporizer is equipped with a heat tracing cable and a heating pipe. Temperature and pressure sensors are configured on the surface of the sulfur dioxide vaporizer. At least three heating tubes are arranged perpendicular to the axial direction of the sulfur dioxide gasifier. The sulfur dioxide gasifier is a gas chamber.

2. The sulfur dioxide gasifier for sand core hardening as described in claim 1, characterized in that, The sulfur dioxide vaporizer is equipped with an insulation layer, a pressure relief valve, a pressure gauge, and a thermometer. The bottom of the sulfur dioxide vaporizer is provided with a sulfur dioxide inlet. The sulfur dioxide gasifier is provided with a sulfur dioxide outlet at the top.

3. The sulfur dioxide gasifier for sand core hardening as described in claim 1, characterized in that, The heat tracing cable is spirally arranged along the axial direction of the sulfur dioxide gasifier; The spacing between adjacent heat tracing cables is 6-7% of the height of the sulfur dioxide vaporizer.

4. The sulfur dioxide gasifier for sand core hardening as described in claim 1, characterized in that, The heat tracing cable, heating pipe, temperature sensor, and pressure sensor are connected to the control center.

5. A sulfur dioxide generator for hardening sand cores, characterized in that, The sulfur dioxide generator includes: a cabinet, a heater disposed within the cabinet, and a sulfur dioxide gasifier for hardening sand cores as described in any one of claims 1-4; The heater is connected to the sulfur dioxide gasifier used for hardening sand cores.

6. The sulfur dioxide generator for sand core hardening as described in claim 5, characterized in that, The cabinet is equipped with an exhaust gas interface that is connected to the sulfur dioxide gasifier used for sand core hardening. The outlet of the sulfur dioxide gasifier used for sand core hardening is connected to the exhaust gas interface; The cabinet is equipped with a sulfur dioxide gas inlet. The sulfur dioxide gas inlet is connected to the inlet of the sulfur dioxide gasifier used for sand core hardening.

7. The sulfur dioxide generator for sand core hardening as described in claim 5, characterized in that, The cabinet is equipped with an electrical control area and a gas valve area; The valve area is equipped with a compressed gas inlet. The compressed gas inlet is connected to the sulfur dioxide gasifier used for sand core hardening via a gas valve area.

8. A sand core hardening device, characterized in that, The sand core hardening device includes: a sulfur dioxide generator for sand core hardening as described in any one of claims 5-7.

9. The sand core hardening device as described in claim 8, characterized in that, The sand core hardening device also includes: a core-making machine; The core box of the core-making machine is connected to the sulfur dioxide generator used for core hardening.

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