Resin sand preheating mechanism

Abstract

The utility model relates to the technical field of heating equipment, and particularly discloses a resin sand preheating mechanism which comprises a box body, an auger, a heating device, an insulating layer, a temperature sensor and the like. A cavity used for containing resin sand is arranged in the box body, the box body further comprises a feeding channel and a discharging channel, the packing auger comprises a rotating shaft and a spiral blade circumferentially arranged on the rotating shaft, the heating device comprises an electric heating plate, the electric heating plate comprises an electric heating component, and the electric heating component is connected with the packing auger. And the electric heating plate covers the outer part of the box body, extends from the feeding channel to the discharging channel, and is used for heating the space in the cavity. According to the resin sand preheating mechanism provided by the utility model, the resin sand can be preheated, and the temperature stability of the resin sand for a resin sand mold is ensured, so that the resin sand mold with stable quality can be provided on the premise of proper amount of resin and curing agent, and the stability of the whole technological process is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of heating equipment, in particular to a resin sand preheating mechanism. Background Art

[0002] Resin sand mold is the most widely used sand mold forming technology in the foundry industry. Resin sand mold has the advantages of high precision, strong plasticity, self-hardening at room temperature without baking, and good disintegration.

[0003] The quality of resin sand molds plays a critical role in the production of fused-cast refractory materials. However, the preparation of resin sand molds is also sensitive to the molding temperature. Temperature fluctuations can lead to various process uncertainties. Especially in the cold winter, when the sand stored at room temperature is too cold, it can easily cause fluctuations in the quality of the resin sand molds, leading to instability in the entire process. Utility Model Content

[0004] The technical problem solved by the utility model is: how to ensure the quality stability of the resin sand mold process.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A resin sand preheating mechanism, comprising:

[0007] A box body, wherein the box body includes a cavity for accommodating resin sand, the cavity includes a first end and a second end, and the box body further includes a feed channel and a discharge channel, the feed channel is connected to the cavity and is adjacent to the first end of the cavity, and the discharge channel is connected to the cavity and is adjacent to the second end of the cavity;

[0008] An auger, the auger comprising a rotating shaft and spiral blades circumferentially arranged on the rotating shaft, the auger being located in the cavity, and an extending direction of the rotating shaft being matched with an extending direction of the cavity;

[0009] A heating device, comprising an electric heating plate, the electric heating plate including an electric heating component, the electric heating plate being coated on the outside of the box and extending from the feed channel to the discharge channel, the electric heating plate being used to heat the space inside the cavity;

[0010] an insulating layer, the insulating layer being located between the box and the electric heating plate;

[0011] A temperature sensor is used to collect temperature data in the discharge channel.

[0012] In one embodiment of the present invention, a thermal fluid channel is further provided. The thermal fluid channel is located in the side wall of the box body and is used for the circulation of thermal fluid.

[0013] In one solution of the present invention, the cavity is a cylindrical structure.

[0014] In one embodiment of the present invention, the resin sand preheating mechanism further includes a feeding device, which is fixedly connected to the box body and communicates with the feeding channel.

[0015] In one embodiment of the present invention, the resin sand preheating mechanism further includes a discharge device, which is fixedly connected to the box body and communicates with the discharge channel.

[0016] In one embodiment of the present invention: the resin sand preheating mechanism also includes a first insulation layer coated on the outside of the box body, and the resin sand preheating mechanism also includes a second insulation layer coated on the outside of the discharge channel, and the first insulation layer is located between the insulating layer and the box body.

[0017] In one embodiment of the present invention, the discharge channel further includes a flow control device.

[0018] In one solution of the present invention, the number of the flow control devices is more than two, and the flow control devices are arranged in sequence along the extension direction of the discharge channel.

[0019] In one embodiment of the present invention, a controller is further included, the temperature sensor is communicatively connected to the controller, and the controller is used to control the power of the electric heating plate.

[0020] In one embodiment of the present invention, a backflushing pipe is further included, and the backflushing pipe is connected to one end of the cavity close to the feed channel.

[0021] Beneficial effects of the utility model:

[0022] It can realize preheating of resin sand for resin sand molds, ensure the temperature stability of resin sand for resin sand molds, thereby being able to provide resin sand molds of stable quality under the premise of appropriate amounts of resin and curing agent, and avoid fluctuations in the quality of resin sand molds caused by excessively low temperature of resin sand stored at room temperature in winter and fluctuations in the corresponding addition ratio of resin and curing agent, thereby ultimately ensuring the stability of the entire process.

[0023] An electric heating device fully wrapped around the outside of the box is used as a heating device to preheat the resin sand. No additional pipeline structure is required. The modified equipment has a simple structure, strong operability, and is easy to maintain later.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 It is a structural diagram of the present utility model.

[0027] The reference numerals in the figure are: 1. box body; 2. feed channel; 3. discharge channel; 4. auger; 5. heating device. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0031] Resin sand generally refers to a type of gravel, such as quartz sand, that can be mixed with resin to create resin sand molds. In the casting process, it is crucial to ensure consistent quality using resin sand, while maintaining the appropriate dosage of resin and curing agent. Generally speaking, the optimal operating temperature for quartz sand combined with resin is 12-25°C. Within this temperature range, the bonding between quartz sand and resin accelerates with increasing temperature. Therefore, in practice, the resin ratio is appropriately reduced and the curing agent type is adjusted as the temperature rises.

[0032] In low ambient temperatures (for example, in winter when the room temperature is below 10°C), the temperature of the resin sand stored at room temperature is relatively low, and it is usually necessary to increase the amount of resin and curing agent added to ensure the moldability of the resin sand mold. However, fluctuations in the resin addition ratio can cause unstable resin sand mold quality. For example, an excessive resin ratio will result in lower resin sand mold strength. Fluctuations in the resin addition ratio can also cause surface defects in the cast refractory material. An excessive curing agent addition ratio will increase costs and affect the internal and external quality of the product in the subsequent casting process. Therefore, in order to ensure the stability of the resin sand mold, the temperature of the resin sand during the molding process can be maintained to ensure the stability of the process parameters and the quality of the product.

[0033] See also Figure 1 The present invention provides a resin sand preheating mechanism, comprising: a box 1, an auger 4, a heating device 5, an insulating layer, and a temperature sensor. The box 1 includes a cavity for accommodating resin sand, the cavity including a first end and a second end. The box 1 includes a feed channel 2 for feeding and a discharge channel 3 for discharging. The feed channel 2 is connected to the cavity and is adjacent to the first end of the cavity, and the discharge channel 3 is connected to the cavity and is adjacent to the second end of the cavity. The resin sand preheating mechanism can improve the quality of the resin sand mold. The resin sand preheating mechanism can be introduced between the sand bin and the sand mixer. The resin sand in the sand bin can enter the cavity from the feed channel and be transported by the auger 4. The resin sand can flow from the feed channel to the discharge channel. During this period, the resin sand can be preheated by an electric heating plate. After the resin sand flows out of the discharge channel, it can enter the sand mixer for subsequent processes. The temperature of the preheated resin sand is stable, thereby ensuring the stability of the subsequent process. The above-mentioned resin sand preheating mechanism can preheat the resin sand used for the resin sand mold, ensure the temperature stability of the sand used for the resin sand mold, and thus provide a resin sand mold of stable quality under the premise of appropriate amounts of resin and curing agent, and solve the fluctuation of the quality of the resin sand mold caused by the low temperature of the sand stored at room temperature in winter and the fluctuation of the corresponding resin and curing agent addition ratio, and ultimately ensure the stability of the entire process.

[0034] See also Figure 1 In one embodiment of the present invention, the auger 4 includes a rotating shaft and spiral blades circumferentially disposed on the rotating shaft. The auger 4 is located within the cavity, and the extending direction of the rotating shaft matches the extending direction of the cavity. For example, the extending direction of the auger 4 can be substantially consistent with the extending direction of the cavity. As shown in the exemplary figure, the cavity extends horizontally, and the rotating shaft of the auger 4 also extends horizontally. After entering the cavity through the feed channel 2, the material can be transported by the auger 4 to the position of the discharge channel 3.

[0035] See also Figure 1 In one embodiment of the present invention, the rotating shaft can be rotatably arranged in the box body 1, one end of which can extend to the outside of the box body 1 and be connected to the output shaft of the power source through a coupling. The power source can be an electric motor, which drives the rotating shaft to rotate. The rotation of the rotating shaft can drive the spiral blades to rotate together, thereby transporting the material from the first end of the cavity to the second end.

[0036] See also Figure 1 In one embodiment of the present invention, the heating device 5 includes an electric heating plate, which includes an electric heating component. The electric heating plate is coated on the outside of the box body 1 and extends from the feed channel 2 to the discharge channel 3. The electric heating plate is used to heat the space inside the cavity. The heating device 5 itself can generate a heating temperature of 150-300°C. The electric heating plate extends from the feed channel 2 to the discharge channel 3. The extended coverage range usually corresponds to the size of the cavity, so that the electric heating plate can fully coat the outside of the cavity and better heat the space inside the cavity. The use of an electric heating plate that is fully coated on the outside of the box body 1 as a heating device has high heating efficiency, a more controllable heating rate, and no need to set up a pipeline structure, etc., making the device structure relatively simple, easy to maintain, and convenient for modifying existing equipment.

[0037] In one embodiment of the present invention, the device further includes a thermal fluid channel (not shown). This channel can be located within the sidewalls of the housing 1 to allow for the circulation of a thermal fluid (e.g., oil or water) for heat exchange. The end of the thermal fluid channel can extend to the outer wall of the housing 1, allowing for communication via a pipe with a heating chamber, where the thermal fluid can be heated. In actual use, the thermal fluid can be heated in a separate heating chamber to a temperature suitable for preheating the sand (e.g., 150-200°C). The heated thermal fluid can then circulate within the sidewalls of the housing 1 through the thermal fluid channel, transferring heat to the housing 1 through heat exchange, and then transferring the heat to the sand via the housing 1. This embodiment combines electric heating with indirect heating using a thermal fluid to provide a more flexible and efficient sand preheating method. Electric heating can serve as the primary heating method, while indirect heating using a thermal fluid can serve as a backup or auxiliary heating mechanism. When heating resin sand, electric heating can be used for initial preheating. If the desired temperature cannot be reached or maintained using electric heating alone, the indirect heating system can be activated to provide additional heat.

[0038] See also Figure 1In one embodiment of the present invention, the electric heating plate can be made of a thin metal plate (for example, an aluminum plate, a stainless steel plate, etc.), the thickness of which can be about 20 mm, and the interior of the electric heating plate can be evenly filled with electric heating alloy wires as electric heating components. The electric heating plate can be divided into multiple groups when laid out. As an example, it can be divided into 3 groups; the length of each group can be set to about 700 mm, and evenly divided into 7 parts, each part is about 100 mm. A certain spacing can be set between the groups, and the spacing can be set to 10 mm. Generally speaking, the design of multiple groups of electric heating plates can facilitate the installation, modification and maintenance of the heating device, and the appropriate spacing between the electric heating plates will not significantly affect the heating and insulation effects.

[0039] See also Figure 1 In one embodiment of the present invention, the insulating layer (not shown) is located between the housing 1 and the heating plate, and its coverage area is generally not less than that of the heating plate. Providing an insulating layer between the housing 1 and the heating plate can serve as a barrier, preventing leakage from the heating plate due to special reasons and reducing safety hazards. The insulating layer can be made of a mica soft board or other insulating material, and the thickness of the insulating layer can be set to approximately 3 mm.

[0040] See also Figure 1 In one embodiment of the present invention, the temperature sensor (not shown in the figure) can be provided in the discharge channel 3 to collect temperature data in the discharge channel 3. This facilitates temperature monitoring and adjustment of the working efficiency of the heating device 5. The temperature sensor can be communicatively connected to the controller so that the collected temperature data can be transmitted to the controller, and the controller can be used to control the power of the electric heating plate according to the preset temperature value and the real-time temperature data collected by the temperature sensor. By providing a temperature sensor and a controller, the working efficiency of the heating device 5 can be automatically controlled to ensure the stability of the heating temperature of the resin sand. For example, the discharge temperature of the resin sand can be maintained in an optimal range of about 14-16°C.

[0041] See also Figure 1 In one embodiment of the present invention, the cavity can be shaped as a columnar structure. Preferably, the cavity can be a cylindrical structure, the size of which is generally compatible with the size of the auger 4. This facilitates the transportation of materials within the cavity and avoids residual accumulation of materials. Accordingly, the housing 1 can be configured as a cylindrical structure, so that the wall thickness of the housing 1 is uniform, thereby enabling better heating.

[0042] See also Figure 1In one embodiment of the present invention, the resin sand preheating mechanism further includes a feeding device, which can be fixedly connected to the housing 1 and communicate with the feed channel 2. The feeding device can be a feed hopper, etc. The feed hopper can be connected to a silo to facilitate feeding. A flow control device can be provided in the feed channel 2 to control the feed rate according to usage. The flow control device can be a control valve, such as a gate valve.

[0043] See also Figure 1 In one embodiment of the present invention, the resin sand preheating mechanism further includes a discharge device, which can be fixedly connected to the housing 1 and communicate with the discharge channel 3. The discharge device can be a discharge cylinder, etc. The end of the discharge cylinder away from the housing 1 can be communicated with a resin sand mixer to transport the preheated resin sand to the mixer for subsequent processing.

[0044] See also Figure 1 In one embodiment of the present invention, the discharge channel 3 further includes a flow control device. The number of the flow control devices can be more than two, and the flow control devices can be arranged in sequence according to the extension direction of the discharge channel 3. If the discharge channel 3 can be set in the up and down directions, the flow control devices can be distributed in sequence along the up and down directions. The flow control device can use a control valve, such as a gate valve. Setting more than two control valves can ensure the stability and reliability of the opening and closing of the discharge channel 3. A buffer space can also be formed between the upper and lower control valves to deal with some situations. For example, when the temperature is too high, the control valve can be closed to cool down naturally for a period of time, and then the resin sand can be transported to the sand mixer.

[0045] See also Figure 1 In one embodiment of the present invention, the outside of the box body 1 and the discharge channel 3 are coated with an insulation layer (not shown in the figure). The insulation layer can be made of ceramic fiber blanket or the like, and the thickness of the insulation layer can be set to about 20 mm. The insulation layer plays a role of thermal insulation and heat insulation, thereby reducing the heat loss in the inner cavity of the box body 1 and the discharge channel 3, and ensuring the temperature stability. The insulation layer may include a first insulation layer coated on the outside of the box body and a second insulation layer coated on the outside of the discharge channel. The first insulation layer may be arranged between the electric heating plate and the box body 1. More specifically, the first insulation layer may be located on the inner side of the insulating layer and in contact with the box body 1. The second insulation layer may be located outside the discharge channel 3. The insulation layer usually needs to fully cover the box body 1 and / or the discharge channel 3 to better achieve the insulation effect.

[0046] See also Figure 1In one embodiment of the present invention, the device further includes a backflush pipe (not shown), which is connected to one end of the cavity near the feed channel. The outlet of the backflush pipe can be directed toward the bottom of the cavity. The backflush pipe can be provided to allow high-pressure water or high-pressure airflow to be introduced into the cavity, thereby cleaning the interior of the cavity when necessary.

[0047] The above describes an embodiment of the present invention in detail. However, the above description is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A resin sand preheating mechanism, characterized in that: include: A box body, wherein the box body includes a cavity for accommodating resin sand, the cavity includes a first end and a second end, and the box body further includes a feed channel and a discharge channel, the feed channel is connected to the cavity and is adjacent to the first end of the cavity, and the discharge channel is connected to the cavity and is adjacent to the second end of the cavity; An auger, the auger comprising a rotating shaft and spiral blades circumferentially arranged on the rotating shaft, the auger being located in the cavity, and an extending direction of the rotating shaft being matched with an extending direction of the cavity; A heating device, comprising an electric heating plate, the electric heating plate including an electric heating component, the electric heating plate being coated on the outside of the box and extending from the feed channel to the discharge channel, the electric heating plate being used to heat the space inside the cavity; an insulating layer, the insulating layer being located between the box and the electric heating plate; A temperature sensor is used to collect temperature data in the discharge channel.

2. A resin sand preheating mechanism according to claim 1, characterized in that: It also includes a thermal fluid channel, which is located in the side wall of the box and is used for the circulation of thermal fluid.

3. A resin sand preheating mechanism according to claim 1, characterized in that: The cavity is a cylindrical structure.

4. A resin sand preheating mechanism according to claim 1, characterized in that: The resin sand preheating mechanism also includes a feeding device, which is fixedly connected to the box body and communicates with a feeding channel.

5. The resin sand preheating mechanism according to claim 1, characterized in that: The resin sand preheating mechanism also includes a discharging device, which is fixedly connected to the box body and communicates with the discharging channel.

6. A resin sand preheating mechanism according to claim 1, characterized in that: The resin sand preheating mechanism also includes a first insulation layer coated on the outside of the box body, and the resin sand preheating mechanism also includes a second insulation layer coated on the outside of the discharge channel. The first insulation layer is located between the insulating layer and the box body.

7. The resin sand preheating mechanism according to claim 1, characterized in that: The discharge channel also includes a flow control device.

8. A resin sand preheating mechanism according to claim 7, characterized in that: The number of the flow control devices is more than two, and the flow control devices are arranged in sequence according to the extension direction of the discharge channel.

9. The resin sand preheating mechanism according to claim 1, characterized in that: It also includes a controller, the temperature sensor is communicatively connected to the controller, and the controller is used to control the power of the electric heating plate.

10. The resin sand preheating mechanism according to claim 1, characterized in that: It also includes a backflushing pipe, which is connected to one end of the cavity close to the feed channel.

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