Rapid hardening device and hardening method for self-hardening sand in low-temperature season

Abstract

The invention discloses a rapid hardening device and method for self-hardening sand in a low-temperature season, and belongs to the technical field of casting, the rapid hardening device comprises a device body arranged on a sand mixer, the device body comprises a heating box and a cable, and a temperature thermocouple and an electric heating tube are fixedly arranged in the heating box; one end of the cable is connected with the electric heating tube, and the other end of the cable penetrates through the heating box to be connected with an automatic control box. The temperature display is arranged to monitor the temperature in real time, and meanwhile, the automatic control box is used for automatically adjusting the voltage and the power supply of the electric heating tube, so that the molding core-making production is not influenced by seasons and environment temperatures, stable and automatic temperature adjustment is realized, rapid hardening of self-hardening sand is realized, and the production efficiency is ensured; the device has no special requirements on modeling sites, equipment and tools, and is simple in structure and convenient and flexible to use; the mode of directly heating the molding sand is adopted, the investment cost is reduced, and uniform heating can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a self-hardening sand low-temperature seasonal rapid hardening device and hardening method. Background Art

[0002] In the foundry industry, core making is a key process step, mainly used to prepare the mold and internal structure of the casting. At present, the self-hardening sand core making method has become the most widely used technology in this field due to its high efficiency and convenience.

[0003] Although the self-hardening sand molding and core making method has many advantages, it has a significant disadvantage, that is, the hardening speed of self-hardening sand is easily affected by the ambient temperature. Especially in low temperature seasons, the hardening process of self-hardening sand slows down significantly, resulting in a significant decrease in production efficiency. This problem is particularly prominent in automated production lines, because the slow hardening speed caused by low temperatures will directly affect the normal operation of the production line.

[0004] In response to this problem, some technical solutions have been proposed to promote the hardening of self-hardening sand in low-temperature seasons. For example, the invention patent with publication number CN108188350A and patent name "Casting method for preventing deformation of large gear cores" provides a method of accelerating hardening by hot air, but this method has limitations when dealing with large sand cores and sand molds, such as the need to be equipped with large hot air equipment and the difficulty of uniform heating. The utility model patent with publication number CN209736568U and patent name "A heating device for resin sand production line" provides a method for installing heating facilities under the molding line. Although it can effectively increase the hardening speed, it has high requirements for site and equipment and lacks flexibility.

[0005] Therefore, how to provide a self-hardening sand low-temperature seasonal rapid hardening device and hardening method with simple equipment and low investment cost is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] The purpose of the present invention is to provide a device and method for rapid hardening of self-hardening sand in low-temperature seasons to solve the problems in the background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides a low-temperature seasonal rapid hardening device for self-hardening sand, including a device body arranged on a sand mixer, the device body including a heating box and a cable, a temperature measuring thermocouple and an electric heating tube are fixedly arranged inside the heating box, one end of the cable is connected to the electric heating tube, and the other end of the cable passes through the heating box and is connected to an automatic control box.

[0008] Preferably, a temperature display is provided on the outer wall of the heating box, the temperature display is connected to the temperature measuring thermocouple via a first connection line, and the temperature display is connected to the automatic control box via a second connection line.

[0009] Preferably, the sand mixer comprises a sand storage, a sand mixer arm, a sand mixer column and a sand mixer arm, the lower outlet of the sand storage is connected to the top of the heating box, and a gate is provided at the connection between the sand storage and the heating box.

[0010] Preferably, the sand mixer arm is arranged at the bottom of the heating box, and the discharge port of the heating box is arranged above the feed port of the sand mixer arm.

[0011] Preferably, a sand mixer column is fixedly arranged at the bottom of the sand mixer arm, a first motor is fixedly arranged at one end of the sand mixer arm, and a sand mixer forearm is connected to the other end of the sand mixer arm; a second motor is fixedly arranged at one end of the sand mixer forearm, and an outlet is arranged at the other end of the sand mixer forearm, and material passing channels are arranged on the sand mixer arm and the sand mixer forearm, and the discharge port of the sand mixer arm is connected to the feed port of the sand mixer forearm.

[0012] Preferably, the automatic control box is provided with a temperature controller, a PLC controller, a transformer and a contactor.

[0013] The present invention is based on a low-temperature seasonal rapid hardening device for self-hardening sand and provides a hardening method thereof, which is characterized by comprising the following steps: S1, open the gate to allow the self-hardening sand in the sand storage to flow into the heating box, and then close the gate; S2, the electric heating tube is powered on, and the electric heating tube starts to heat the self-hardening sand. When the temperature measured by the temperature display reaches the preset value, the gate, the first motor and the second motor are opened at the same time to mix the sand; S3. During sand mixing, the big arm of the sand mixer conveys the heated self-hardening sand to the small arm of the sand mixer. After the small arm of the sand mixer stirs and mixes the sand, the evenly mixed heated self-hardening sand is output from the outlet for subsequent molding and core making.

[0014] Preferably, during the self-hardening sand transportation process, the electric heating tube continuously heats the self-hardening sand. According to the sand temperature displayed on the temperature display, the automatic control box automatically adjusts the voltage and power on / off of the electric heating tube to keep the self-hardening sand in the heating box at a preset temperature.

[0015] Therefore, the present invention discloses a self-hardening sand low-temperature seasonal rapid hardening device and hardening method, which has the following beneficial effects: (1) By setting the temperature display to monitor the temperature in real time and adjusting the voltage and power supply of the heating tube through the automatic control box, the self-hardening sand can be maintained at the preset temperature, so that the molding and core making production is not affected by the season and ambient temperature, and rapid hardening is achieved to ensure production efficiency.

[0016] (2) By setting up a heating box, an automatic control box and connecting relevant control equipment, efficient and automatic temperature regulation can be achieved, and the equipment is simple and easy to use. Compared with other heating methods such as hot air hoods or heating facilities, the direct heating method of the molding sand adopted by this device has lower investment costs and can achieve uniform heating.

[0017] (3) This device has no special requirements for the molding site, equipment and tooling, and is easy and flexible to use. At the same time, by changing the preset temperature, it can be applied to various types of self-hardening resin sand, such as furan resin sand, Bonnie resin sand, etc.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 This is a partial enlarged view of the heating box of an embodiment of the present invention; Reference numerals: 1. Heating box; 2. Temperature measuring thermocouple; 3. Electric heating tube; 4. Cable; 5. Automatic control box; 6. Temperature display; 7. First connection line; 8. Second connection line; 9. Sand storage; 10. Gate; 11. Sand mixer arm; 12. Sand mixer column; 13. First motor; 14. Second motor; 15. Sand mixer arm; 16. Exit. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0022] Example like Figure 1-Figure 2As shown, a device and hardening method for accelerating the hardening speed of resin sand in low temperature seasons of the present invention include a device body arranged on a sand mixer, the device body includes a heating box 1 and a cable 4, the heating box 1 is preferably inverted cone shape, so that the molding sand can automatically descend, and a temperature measuring thermocouple 2 and an electric heating tube 3 are fixedly arranged inside the heating box 1. If the sand mixer is large and the sand flow rate is large, a larger heating box 1 and electric heating tube 3 should be designed and selected, and a larger number of electric heating tubes 3 should be installed in the heating box 1. The shape and size of the electric heating tube 3 can be customized according to the shape and size of the heating box, or existing products of a professional factory can be purchased for assembly, which can be flexibly determined.

[0023] One end of the cable 4 is connected to the electric heating tube 3. The power of the electric heating tube 3 is designed according to the size of the sand mixer and can be selected between 1 and 5KW. The other end of the cable 4 passes through the heating box 1 and is connected to the automatic control box 5, which automatically adjusts the power supply voltage of the electric heating tube 3 or automatically cuts off and supplies power.

[0024] A temperature display 6 is provided on the outer wall of the heating box 1. The temperature display 6 is connected to the temperature measuring thermocouple 2 through a first connection line 7, and can monitor the sand temperature in the heating box 1 in real time; the temperature display 6 is connected to the automatic control box 5 through a second connection line 8. The automatic control box 5 can automatically adjust the power supply and voltage of the electric heating tube 3 through the components and cables 4 in the box according to the sand temperature of the temperature display 6, so as to maintain the resin sand at a preset temperature.

[0025] Before molding and core making, the power is turned on, and the electric heating tube 3 starts to heat the molding sand. When the temperature display 6 shows that the sand temperature reaches the requirement, the sand mixer can be started to mold and make cores normally. During the molding and core making process, the molding sand flows, and the electric heating tube 3 continues to heat the molding sand. According to the actual sand temperature displayed by the temperature display 6, the control part automatically adjusts the power supply voltage of the electric heating tube 3 or automatically cuts off and supplies power to keep the molding sand temperature in the heating box 1 within a reasonable range. Using this method to mold and make cores, it can be unaffected by the ambient temperature, so that production can proceed normally as if the ambient temperature is ideal.

[0026] The sand mixer includes a sand storage 9, a sand mixer arm 11, a sand mixer column 12 and a sand mixer arm 15. The lower outlet of the sand storage 9 is connected to the top of the heating box 1. A gate 10 is provided at the connection between the sand storage 9 and the heating box 1. The gate 10 can adjust the flow rate of the resin sand from the sand storage 9 to the heating box 1 as needed. The sand mixer arm 11 is arranged at the bottom of the heating box 1, and the discharge port of the heating box 1 is arranged above the feed port of the sand mixer arm 11.

[0027] The bottom of the sand mixer arm 11 is fixedly connected to the sand mixer column 12, a first motor 13 is fixedly arranged at one end of the sand mixer arm 11, and a sand mixer arm 15 is connected to the other end of the sand mixer arm 11. The sand mixer arm 11 and the sand mixer arm 15 are both provided with a material passing channel, and the material outlet of the sand mixer arm 11 is connected to the material inlet of the sand mixer arm 15. A second motor 14 is fixedly arranged at one end of the sand mixer arm 15, and an outlet 16 is arranged at the other end of the sand mixer arm 15.

[0028] The automatic control box 5 is provided with components such as a temperature controller, a PLC controller, a transformer and a contactor, and can automatically adjust the voltage supplied to the electric heating tube 3 or the on-off of the power supply through the cable 4.

[0029] The steps for making the above device are as follows: ① Remove the sand receiving funnel above the automatic sand mixer, transform the sand storage 9 above, and leave the required space.

[0030] ② According to the size of the automatic sand mixer, design the heating box 1 and the automatic control box 5, and prepare components such as electric heating tubes, thermocouples, temperature displays, thermal sensors, temperature controllers, PLC controllers, transformers, contactors, circuit breakers and switches.

[0031] ③ Select steel plates with a thickness of 6 to 10 mm, and weld them to produce the heating box 1 and the automatic control box 5 according to the design requirements.

[0032] ④Install and debug according to the above device structure.

[0033] Based on the above device, a hardening method is provided as follows: S1, open the gate 10 to allow the self-hardening sand in the sand storage 9 to flow into the heating box 1, and then close the gate 10; S2, the electric heating tube 3 is powered on, and the electric heating tube 3 starts to heat the self-hardening sand. When the temperature of the self-hardening sand in the heating box 1 reaches a preset value, the gate 10, the first motor 13 and the second motor 14 are opened at the same time to mix the sand; S3, when mixing sand, the sand mixer arm 11 transports the heated self-hardening sand to the sand mixer arm 15, and the sand is mixed by the sand mixer arm 15, and the evenly mixed heated self-hardening sand is output from the outlet 16 for subsequent molding and core making.

[0034] During the self-hardening sand transportation process, the electric heating tube 3 will continue to heat the self-hardening sand. According to the sand temperature displayed by the temperature display 6, the automatic control box 5 will automatically adjust the voltage and power on / off of the electric heating tube 3 to keep the self-hardening sand in the heating box 1 within the preset temperature range. The molding and core making by this method will not be affected by the ambient temperature, so that the production can proceed normally as if the ambient temperature is ideal.

[0035] Therefore, the present invention relates to a low-temperature seasonal rapid hardening device and hardening method for self-hardening sand. By setting a temperature display to monitor the temperature in real time and adjusting the voltage and power supply of the heating tube through the automatic control box, the self-hardening sand can be maintained at a preset temperature, so that the molding and core making production is not affected by the season and ambient temperature, rapid hardening is achieved, and production efficiency is guaranteed.

[0036] By setting up a heating box, an automatic control box and connecting related control equipment, efficient and automatic temperature regulation can be achieved, and the equipment is simple and easy to operate. Compared with other heating methods such as hot air hoods or heating facilities, the direct heating method used by this device has lower investment costs and can achieve uniform heating.

[0037] The device has no special requirements for the molding site, equipment and tooling, and is easy and flexible to use. At the same time, it can be applied to various types of self-hardening resin sands, such as furan resin sand, Bonnie resin sand, etc., by changing the preset temperature.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A self-hardening sand low-temperature seasonal rapid hardening device, characterized by: The invention comprises a device body arranged on a sand mixer, the device body comprises a heating box and a cable, a temperature measuring thermocouple and an electric heating tube are fixedly arranged inside the heating box, one end of the cable is connected to the electric heating tube, and the other end of the cable passes through the heating box and is connected to an automatic control box.

2. The self-hardening sand low-temperature seasonal rapid hardening device according to claim 1, characterized in that: A temperature display is arranged on the outer wall of the heating box. The temperature display is connected to the temperature measuring thermocouple via a first connection line, and the temperature display is connected to the automatic control box via a second connection line.

3. The self-hardening sand low-temperature seasonal rapid hardening device according to claim 2 is characterized by: The sand mixer comprises a sand storage, a sand mixer arm, a sand mixer column and a sand mixer arm. The lower outlet of the sand storage is connected to the top of the heating box, and a gate is provided at the connection between the sand storage and the heating box.

4. The self-hardening sand low-temperature seasonal rapid hardening device according to claim 1, characterized in that: The sand mixer arm is arranged at the bottom of the heating box, and the discharge port of the heating box is arranged above the feed port of the sand mixer arm.

5. The self-hardening sand low-temperature seasonal rapid hardening device according to claim 4, characterized in that: A sand mixer column is fixedly arranged at the bottom of the sand mixer arm, a first motor is fixedly arranged at one end of the sand mixer arm, and a sand mixer arm is connected to the other end of the sand mixer arm; a second motor is fixedly arranged at one end of the sand mixer arm, and an outlet is arranged at the other end of the sand mixer arm.

6. The self-hardening sand low-temperature seasonal rapid hardening device according to claim 5, characterized in that: The automatic control box is provided with a temperature controller, a PLC controller, a transformer and a contactor.

7. A hardening method based on the self-hardening sand low-temperature seasonal rapid hardening device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, open the gate to allow the self-hardening sand in the sand storage to flow into the heating box, and then close the gate; S2, the electric heating tube is powered on, and the electric heating tube starts to heat the self-hardening sand. When the temperature measured by the temperature display reaches the preset value, the gate, the first motor and the second motor are opened at the same time to mix the sand; S3. During sand mixing, the big arm of the sand mixer conveys the heated self-hardening sand to the small arm of the sand mixer. After the small arm of the sand mixer stirs and mixes the sand, the evenly mixed heated self-hardening sand is output from the outlet for subsequent molding and core making.

8. The hardening method of the self-hardening sand low-temperature seasonal rapid hardening device according to claim 7, characterized in that: During the self-hardening sand transportation process, the electric heating tube continuously heats the self-hardening sand. According to the sand temperature displayed on the temperature display, the automatic control box will automatically adjust the voltage and power on / off of the electric heating tube to keep the self-hardening sand in the heating box at the preset temperature.

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