Molding sand online monitoring system and method

Abstract

The present application provides a molding sand online monitoring system and method thereof, the system comprising: a sand mixer, the sand mixer is used to add raw materials and water into the sand mixer through a feeding device and a water adding device respectively and mix the raw materials and water added therein to obtain molding sand; a testing device, the testing device is used to obtain the molding sand in the sand mixer and detect the quality parameters of the molding sand to obtain the molding sand quality parameter value; a control device, the control device is used to obtain the molding sand quality parameter value and compare the molding sand quality parameter value with the molding sand quality standard value range stored therein, if the molding sand quality parameter value meets the molding sand quality standard value range, it is determined that the quality of the molding sand is qualified; otherwise, it is determined that the quality of the molding sand is unqualified, and the feeding device is controlled by the control device to add a preset mass of raw materials into the sand mixer or the water adding device is added to the sand mixer. The present application ensures the quality of the molding sand and the quality of the castings made from the molding sand, and improves the compliance rate of the finished castings.

Description

Technical Field

[0001] The present application relates to the technical field of molding sand quality monitoring, and in particular to an online molding sand monitoring system and method thereof. Background Art

[0002] Molding sand is a key material used to make sand molds in the foundry industry. Its quality directly affects the quality and production efficiency of castings. Molding sand is usually made by mixing raw sand (such as silica sand, ceramsite sand, etc.), binders (such as clay, resin, etc.) and other additives (such as coal powder, sawdust, etc.) in a certain proportion. Depending on the binder, molding sand can be divided into clay sand, water glass sand, resin sand and other types.

[0003] Molding sand plays a vital role in casting production. Its performance directly affects the quality and production efficiency of castings. Through scientific formula design, reasonable mixing process and effective regeneration technology, the quality and economic benefits of molding sand can be significantly improved. Therefore, in order to improve the quality and production efficiency of castings, this application proposes a molding sand online monitoring system and method. Summary of the invention

[0004] The present application provides a molding sand online monitoring system and method thereof, which are used to solve the technical problems described in the above background technology.

[0005] The present application provides a molding sand online monitoring system, comprising:

[0006] A sand mixer, wherein the sand mixer is used to add raw materials and water into the mixer through a feeding device and a water adding device respectively and mix the raw materials and water added therein to obtain molding sand;

[0007] A testing device, the testing device is used to obtain the molding sand in the sand mixer and detect the quality parameters of the molding sand to obtain the molding sand quality parameter values;

[0008] A control device, wherein the control device is used to obtain the molding sand quality parameter value and compare the molding sand quality parameter value with the molding sand quality standard value range stored therein. If the molding sand quality parameter value meets the molding sand quality standard value range, it is determined that the quality of the molding sand is qualified; otherwise, it is determined that the quality of the molding sand is unqualified, and the control device is used to control the feeding device to add a preset mass of raw materials into the sand mixer or the water adding device to add a preset volume of water into the sand mixer.

[0009] Optionally, the feeding device includes a storage bin and a feeding pipe;

[0010] The storage bin is arranged close to the sand mixer and is connected to one end of the feeding pipe. The feeding pipe is connected to the sand mixer at one end away from the storage bin. A powder conveying pump electrically connected to the control device is arranged on the feeding pipe.

[0011] Optionally, the water adding device includes a water source and a water adding pipe;

[0012] The water source is communicated with one end of the water adding pipe, and one end of the water adding pipe away from the water source is communicated with the sand mixer. A metering pump electrically connected to the control device is arranged on the water adding pipe.

[0013] Optionally, the testing device includes a first testing unit, a second testing unit and a third testing unit;

[0014] The first testing unit is used to detect the temperature and humidity of the molding sand;

[0015] The second testing unit is used to test the compaction rate and wet compressive strength of the molding sand;

[0016] The third testing unit is used to test the air permeability of the molding sand;

[0017] Wherein, the first test unit, the second test unit and the third test unit are all electrically connected to the control device.

[0018] Optionally, the first test unit includes a sample bucket and a temperature and humidity sensor;

[0019] The sample holding barrel is provided with a feed inlet, and a cover plate is detachably provided on the feed inlet. The temperature and humidity sensor is arranged in the sample holding barrel to detect the temperature and humidity of the molding sand entering the sample holding barrel from the sand mixer through the feed inlet.

[0020] Wherein, the temperature and humidity sensor is electrically connected to the control device.

[0021] Optionally, the second test unit includes a compactness tester body and a telescopic member;

[0022] The compactness tester body is provided with a displacement sensor, the telescopic member is provided on the compactness tester body and a pressure head for pressing down the molding sand in the first sample tube is provided at the telescopic end thereof, and a tension and compression sensor is provided on the telescopic member near the pressure head;

[0023] Wherein, the telescopic member, the displacement sensor and the tension and compression sensor are all electrically connected to the control device.

[0024] Optionally, the third testing unit includes an air permeability tester body;

[0025] A fixing assembly for fixing a second sample tube containing the molding sand is arranged in the test cavity of the air permeability tester body.

[0026] Optionally, the fixing assembly includes a fixing groove of a preset depth and two support plates;

[0027] The fixing groove is arranged on the inner bottom surface of the test cavity of the air permeability measuring instrument body, the two support plates are respectively arranged at the top of the fixing groove opposite to each other and the top threads thereof are penetrated by a fastening bolt, an arc-shaped clamping ring is arranged at one end of the fastening bolt located between the two support plates, and a protective layer is arranged on one side of the clamping ring for clamping the second sample tube.

[0028] Optionally, the sand mixer is connected to a sampling tube, a screw conveyor is arranged in the sampling tube, the bottom of the sampling tube is connected to a discharge pipe, and a diaphragm valve is arranged on the discharge pipe.

[0029] In a second aspect, the present application provides a molding sand online monitoring method, which is applied to any of the above-mentioned molding sand online monitoring systems, comprising:

[0030] Add raw materials and water into the sand mixer through a feeding device and a water adding device respectively, and then mix the raw materials and water entering the sand mixer to obtain molding sand;

[0031] The molding sand in the sand mixer is obtained by a testing device and quality parameters of the molding sand are tested to obtain a molding sand quality parameter value;

[0032] The molding sand quality parameter value is obtained through the control device and compared with the molding sand quality parameter value and the molding sand quality standard value range stored therein. If the molding sand quality parameter value meets the molding sand quality standard value range, it is determined that the quality of the molding sand is qualified; otherwise, it is determined that the quality of the molding sand is unqualified, and the control device is used to control the feeding device to add a preset mass of raw materials into the sand mixer or the water adding device to add a preset volume of water into the sand mixer.

[0033] The molding sand online monitoring system provided by the present application adds raw materials and water into a sand mixer respectively through a feeding device and a water adding device and mixes the raw materials and water added into the sand mixer to obtain molding sand, detects the quality parameters of the molding sand through a testing device to obtain the molding sand quality parameter value, obtains the molding sand quality parameter value through a control device and compares the molding sand quality parameter value with the molding sand quality standard value range stored therein, if the molding sand quality parameter value meets the molding sand quality standard value range, it is determined that the quality of the molding sand is qualified; otherwise, it is determined that the quality of the molding sand is unqualified, and controls the feeding device to add a preset mass of raw materials into the sand mixer or the water adding device to add a preset volume of water into the sand mixer through the control device, thereby realizing the adjustment of the ratio of each raw material and the amount of water used to prepare the molding sand, so that the quality parameters of the prepared molding sand meet the standards, thereby ensuring the quality of the molding sand and the quality of the castings made from the molding sand, and further improving the standard-compliant rate of the finished castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of the structure of an online monitoring system for molding sand provided in one embodiment of the present application;

[0036] Figure 2 A schematic diagram of the structure of a sand mixer provided in one embodiment of the present application;

[0037] Figure 3 A schematic diagram of the structure of a compactness tester body provided in one embodiment of the present application;

[0038] Figure 4 A schematic diagram of the structure of an air permeability measuring instrument body provided in one embodiment of the present application;

[0039] Figure 5 A schematic diagram of the structure of a fixing assembly provided in one embodiment of the present application;

[0040] Figure 6 A schematic diagram of the structure of a sample container provided in one embodiment of the present application;

[0041] Figure 7 A schematic diagram of the electrical connection between an electronic component and a control device provided in one embodiment of the present application.

[0042] In the figure: 100, sand mixer; 101, sampling tube; 102, feeding tube; 1021, diaphragm valve; 200, feeding device; 201, storage bin; 202, feeding tube; 2021, powder delivery pump; 300, water adding device; 301, water source; 302, water adding tube; 3021, metering pump; 400, testing device; 401, first testing unit; 4011, sample tube; 4012, temperature and humidity sensor; 402, second testing unit; 40 21. Compactness tester body; 4022. Telescopic member; 403. Third test unit; 4031. Air permeability tester body; 500. Control device; 600. Feed inlet; 601. Cover plate; 700. First sample tube; 800. Pressure head; 801. Displacement sensor; 802. Tension and compression sensor; 900. Fixing assembly; 901. Second sample tube; 902. Fixing groove; 903. Support plate; 9031. Fastening bolt; 904. Clamping ring. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0044] refer to Figures 1 to 7 The present application provides a molding sand online monitoring system, comprising:

[0045] The sand mixer 100 is used to add raw materials and water therein through the feeding device 200 and the water adding device 300 respectively and mix the raw materials and water added therein to obtain molding sand; wherein the molding sand is usually mixed with raw sand (such as silica sand, expanded clay sand, etc.), binder (such as clay, resin, etc.) and other additives (such as coal powder, sawdust, etc.) in a certain proportion, that is to say, the specifications and models of the sand mixer 100 can be set according to actual needs, and the present application does not make specific limitations on it.

[0046] The testing device 400 is used to obtain the molding sand in the sand mixer 100 and detect the quality parameters of the molding sand to obtain the molding sand quality parameter values; among which, the compaction rate, wet compressive strength, water content, air permeability and temperature, etc., and the molding sand quality parameter values ​​are obtained by detecting the above parameters by the testing device, and the molding sand quality parameter values ​​(compaction rate value, wet compressive strength value, water content value, air permeability value and temperature, etc.) reflect the quality of the molding sand.

[0047] The control device 500 is used to obtain the molding sand quality parameter value and compare the molding sand quality parameter value with the molding sand quality standard value range stored therein. If the molding sand quality parameter value meets the molding sand quality standard value range, the quality of the molding sand is determined to be qualified; otherwise, the quality of the molding sand is determined to be unqualified, and the control device 500 controls the feeding device 200 to add a preset mass of raw materials to the sand mixer 100 or the water adding device 300 to add a preset volume of water to the sand mixer 100. Among them, the control device 500 is integrated with electronic components such as a PLC controller and a processor, which can be set according to the actual functions to be realized, and this application will not be further described here.

[0048] The molding sand online monitoring system provided by the present application adds raw materials and water into the sand mixer 100 through the feeding device 200 and the water adding device 300 respectively, and mixes the raw materials and water added into the sand mixer 100 to obtain molding sand, detects the quality parameters of the molding sand through the testing device 400 to obtain the molding sand quality parameter value, obtains the molding sand quality parameter value through the control device 500 and compares the molding sand quality parameter value with the molding sand quality standard value range stored therein, if the molding sand quality parameter value meets the molding sand quality standard value range, it is determined that the quality of the molding sand is qualified; otherwise, it is determined that the quality of the molding sand is unqualified, and controls the feeding device 200 through the control device 500 to add a preset mass of raw materials into the sand mixer 100 or the water adding device to add a preset volume of water into the sand mixer 100, so as to adjust the ratio of each raw material and the amount of water used to prepare the molding sand, so that the quality parameters of the obtained molding sand meet the standards, thereby ensuring the quality of the molding sand and the quality of the castings made from the molding sand, and further improving the standard-compliant rate of the finished castings.

[0049] In some embodiments, reference Figure 2 The feeding device 200 in the present application includes a storage bin 201 and a feeding pipe 202; specifically, the storage bin 201 is arranged near the sand mixer 100 and is connected to one end of the feeding pipe 202, and the end of the feeding pipe 202 away from the storage bin 201 is connected to the sand mixer 100, and a powder delivery pump 2021 electrically connected to the control device 500 is arranged on the feeding pipe 202. The storage bin 201 refers to a space for storing raw sand (such as silica sand, ceramsite sand, etc.), binder (such as clay, resin, etc.) and other additives (such as coal powder, sawdust, etc.).

[0050] In the above embodiment, before preparing the molding sand, the powder delivery pump 2021 is turned on, and the raw materials stored in the storage bin 201 are delivered to the sand mixer 100 through the feeding pipe 202 in a certain proportion. When the molding sand quality parameter value detected by the testing device 400 does not meet the molding sand quality standard value range, it may be due to an inappropriate raw material ratio or too much or too little water content in the molding sand. If it is due to an inappropriate raw material ratio, the powder delivery pump 2021 electrically connected to the control device 500 is turned on through the control device 500, and the raw materials are input into the sand mixer 100 until the molding sand quality parameter value meets the standard. The powder delivery pump 2021 provides the power for delivering the raw materials, and the specifications and models of the powder delivery pump 2021 can be set according to actual needs.

[0051] In some embodiments, reference Figure 2 The water adding device 300 in the present application includes a water source 301 and a water adding pipe 302; specifically, the water source 301 is connected to one end of the water adding pipe 302, and the end of the water adding pipe 302 away from the water source 301 is connected to the sand mixer 100, and a metering pump 3021 electrically connected to the control device 500 is provided on the water adding pipe 302. When the molding sand quality parameter value detected by the testing device 400 does not meet the molding sand quality standard value range, it may be due to an inappropriate raw material ratio or too much or too little water content in the molding sand, etc. If it is due to too little water, the metering pump 3021 is turned on, and the water from the water source 301 is passed into the sand mixer 100 through the water adding pipe 302 until the molding sand quality parameter value meets the standard. The metering pump 3021 provides water delivery power, and the specifications and models of the metering pump 3021 can be set according to actual needs.

[0052] In some embodiments, reference Figure 1 The testing device 400 in the present application includes a first testing unit 401, a second testing unit 402 and a third testing unit 403; wherein the quality parameters of the molding sand are tested in sequence by the first testing unit 401, the second testing unit 402 and the third testing unit 403.

[0053] Specifically, the first test unit 401 is used to detect the temperature and humidity of the molding sand; since the quality parameters of the molding sand, such as compaction rate, wet compressive strength, air permeability, etc., are affected by temperature and humidity, and humidity can reflect the water content of the molding sand, therefore, before testing the compaction rate, wet compressive strength, air permeability and other parameters of the molding sand, the temperature and humidity of the molding sand are first tested.

[0054] The second test unit 402 is used to detect the compaction rate and wet compressive strength of the molding sand; since the compaction rate and wet compressive strength are important indicators for evaluating the performance of the molding sand. The compaction rate reflects the compactability, toughness and moisture sensitivity of the molding sand, while the wet compressive strength indicates the ability of the molding sand to resist external pressure in a saturated state. By detecting these parameters, the amount of water added to the molding sand can be adjusted to ensure that the molding sand has appropriate wet compressive strength, toughness and fluidity, thereby optimizing the production process and reducing the scrap rate. In addition, the performance of the molding sand directly affects the quality of the casting, and the present application can help technicians adjust the formula of the molding sand according to the test results by detecting the compaction rate and wet compressive strength of the molding sand, ensuring that the performance of the molding sand meets the process requirements. For example, by detecting the compaction rate, the amount of water added to the molding sand can be adjusted so that the molding sand obtains the best comprehensive performance. Therefore, through effective molding sand quality control, casting scraps caused by molding sand quality problems can be reduced, thereby reducing production costs.

[0055] The third test unit 403 is used to detect the air permeability of the molding sand; wherein, air permeability refers to the ability of the molding sand to allow gas to pass through, and this performance directly affects the final quality of the casting. Therefore, it is very important to detect the air permeability of the molding sand, the purpose is to ensure the quality and production efficiency of the casting. Specifically, if the air permeability of the molding sand is too low, these gases cannot be discharged smoothly, resulting in casting defects (for example, defects such as pores, choking and insufficient pouring). If the air permeability of the molding sand is too high, the sand mold will be too loose, which is easy to cause the defects of rough casting surface and mechanical sand adhesion. Therefore, the air permeability of the molding sand needs to be within an appropriate range to ensure the quality and production efficiency of the casting. The present application detects the air permeability of the molding sand and optimizes the production process of the molding sand in time according to the test results. Specifically, by regularly detecting the air permeability, problems in the production process can be discovered in time and adjusted to avoid casting defects caused by insufficient or excessive air permeability, thereby improving the overall quality of the casting.

[0056] The first test unit 401, the second test unit 402 and the third test unit 403 are all electrically connected to the control device 500. The first test unit 401, the second test unit 402 and the third test unit 403 transmit their own test results to the control device 500 respectively, and the control device 500 controls the feeding device 200 to timely adjust the amount of raw materials added to the sand mixer 100 and the amount of water added to the sand mixer 100 by the water adding device 300.

[0057] In some embodiments, reference Figure 6The first test unit 401 in the present application includes a sample barrel 4011 and a temperature and humidity sensor 4012; specifically, a feed port 600 is opened on the sample barrel 4011, and a cover plate 601 is detachably provided on the feed port 600, and the temperature and humidity sensor 4012 is arranged in the sample barrel 4011 for detecting the temperature and humidity of the molding sand that enters the sample barrel 4011 from the sand mixer 100 through the feed port 600; wherein, the sample barrel 4011 is used to hold the molding sand prepared from the sand mixer 100, and in order to ensure the accuracy of the temperature and humidity sensor 4012 in detecting the temperature and humidity of the molding sand, the temperature and humidity sensor 4012 can adopt a digital temperature sensor (for example: DS18B20), a TMP03 chip, an AD590 semiconductor sensor and a capacitive humidity sensor, thereby ensuring the accurate measurement and control of the humidity (moisture) and temperature of the molding sand.

[0058] Among them, the temperature and humidity sensor 4012 is electrically connected to the control device 500.

[0059] In the above embodiment, the temperature and humidity sensor 4012 detects the temperature and humidity of the molding sand contained in the sample barrel 4011, and sends the detected temperature and humidity values ​​to the control device. After receiving the temperature and humidity values ​​sent by the temperature and humidity sensor 4012, the control device 500 compares the temperature and humidity values ​​with the temperature and humidity standard values ​​stored therein, and the temperature and humidity standard values ​​stored in the control device 500 are usually a range of values ​​(for example: temperature is less than 50°C, humidity is between 2.5% and 4.0%). Specifically, when the temperature and humidity of the molding sand do not meet the standard value range, a series of adverse effects will be produced on the quality of the casting and the production process. Specifically, if the molding sand temperature is too high, its physical properties will be reduced, such as the reduction of indicators such as wet compressive strength and air permeability, thereby affecting the surface quality and internal defect control of the casting, and high-temperature molding sand is prone to defects such as sand inclusion, pores, and sticky sand in the casting, increasing the scrap rate. High-temperature molding sand will accelerate the recycling of old sand, resulting in unstable molding sand performance and increasing production difficulty. However, the high humidity of the molding sand (i.e., the high water content in the molding sand) can easily lead to defects such as pores, pinholes, and choking in the castings, affecting the appearance and mechanical properties of the castings; and the high humidity of the molding sand will reduce the wet compressive strength and air permeability of the molding sand, causing the castings to easily have problems such as sand falling and sand washing. Over-wet molding sand has poor fluidity, is difficult to demold, and can easily cause damage to the sand mold. The present application detects the temperature and humidity of the molding sand to facilitate timely control of the molding sand temperature (for example: humidification ventilation cooling, optimization of the sand processing system, template heating device, precise control of the amount of water added, dry storage, and adjustment of the sand mixer parameter lights), so that the quality of the molding sand meets the requirements, thereby improving the overall quality of the castings.

[0060] In some embodiments, reference Figure 3The second test unit 402 in the present application includes a compaction rate tester body 4021 and a telescopic member 4022; specifically, a displacement sensor 801 is arranged on the compaction rate tester body 4021, the telescopic member 4022 is arranged on the compaction rate tester body 4021 and a pressure head 800 for pressing down the molding sand in the first sample tube 700 is arranged at its telescopic end, and a tension and compression sensor 802 is arranged on the telescopic member 4022 near the pressure head 800; wherein, the telescopic member 4022 can be a cylinder, a hydraulic cylinder or an electric push rod, etc., which can be set according to actual conditions, and the present application does not make specific limitations on it. Specifically, the molding sand to be tested is placed in the first sample tube 700, and the volume of the molding sand is marked as V1, and the cross-sectional area of ​​the first sample tube is A. The pressure head 800 is driven by the telescopic member 4022 to extrude the molding sand until the value of the tension and compression sensor 802 reaches the set pressure value, and the extrusion is stopped. The value d of the displacement sensor 801 is read, and the volume of the molding sand in the first sample tube 700 after compression is: V2, and V2=V1-A×d, and the compaction rate=(V1-V2) / V1=(A×d) / V1, thereby obtaining the compaction rate of the molding sand.

[0061] The value detected by the tension and compression sensor 802 is P, and the wet compression strength = maximum pressure / compression area, wherein the maximum pressure is the peak pressure obtained from the sensor data, and the compression area is the area of ​​the contact surface between the sample and the sensor.

[0062] Among them, the telescopic member 4022 , the displacement sensor 801 and the tension and compression sensor 802 are all electrically connected to the control device 500 .

[0063] In the above embodiment, the displacement sensor 801 and the tension and compression sensor 802 transmit the values ​​detected by each of them to the control device 500. After obtaining the values, the control device 500 calculates the compaction rate and wet compressive strength and compares the calculated compaction rate and wet compressive strength with the compaction rate standard value and wet compressive strength standard value stored therein, and timely adjusts the amount of raw materials added to the sand mixer 100 by the feeding device 200 and the amount of water added to the sand mixer 100 by the water adding device 300 according to the comparison results.

[0064] In some embodiments, reference Figure 4 and Figure 5 The third test unit 403 in the present application includes a permeability tester body 4031; specifically, a fixing assembly 900 for fixing a second sample tube 901 containing molding sand is disposed in the test cavity of the permeability tester body 4031.

[0065] In the above embodiment, the setting of the fixing assembly 900 makes the second sample cylinder 901 more stable when the air permeability measuring instrument body 4031 is testing the air permeability of the molding sand in the second sample cylinder 901 .

[0066] In some embodiments, reference Figure 5 The fixing assembly 900 in the present application includes a fixing groove 902 of a preset depth and two support plates 903; specifically, the purpose of the preset depth is to improve the stability of the fixing groove 902 fixing the second sample tube 901, and the value of the preset depth can be set according to actual needs. Therefore, the present application does not make specific limitations on it.

[0067] In addition, the fixing groove 902 is provided on the inner bottom surface of the test cavity of the air permeability measuring instrument body 4031, and the two support plates 903 are respectively arranged at the top of the fixing groove 902 and connected with the fastening bolt 9031 through the thread on the top thereof, and an arc-shaped clamping ring 904 is provided at one end of the fastening bolt 9031 located between the two support plates 903, and a protective layer is provided on one side of the clamping ring 904 for clamping the second sample tube 901.

[0068] In the above embodiment, the second sample tube 901 is placed in the fixing groove 902, and the upper section of the second sample tube 901 is fixed by the clamping ring 904, and the fastening bolt 9031 is threaded through the clamping ring 904 and the clamping ring 904 clamps the second sample tube 901 by rotating the fastening bolt 9031, and the protective layer can be made of rubber material, which not only serves the purpose of fixing the second sample tube 901, but also serves the purpose of protecting the second sample tube 901. The fastening bolt 9031 is rotatably connected to the clamping ring 904 to ensure that when the fastening bolt 9031 is rotated, the clamping ring 904 approaches or moves away from the second sample tube 901 along a straight line.

[0069] In some embodiments, reference Figure 2 The sand mixer 100 in the present application is connected with a sampling tube 101, a screw conveyor is arranged in the sampling tube 101, a feeding tube 102 is connected at the bottom of the sampling tube 101, and a diaphragm valve 1021 is arranged on the feeding tube 102. The sampling tube 101 is horizontally connected to the side wall of the sand mixer 100. When the molding sand in the sand mixer 100 needs to be tested, the screw conveyor is opened, and the molding sand in the sand mixer 100 enters the sampling tube 101 through the screw conveyor. At the same time, the diaphragm valve 1021 is opened, so that the molding sand in the sampling tube 101 enters the feeding tube 102, and the molding sand in the feeding tube 102 is collected and tested. When the sampling tube 101 and the screw conveyor are not sampled, the sand mixer 100 is in a state of no leakage, and the setting of the feeding tube 102 and the diaphragm valve 1021 makes it more convenient to take the molding sand.

[0070] In a second aspect, the present application provides a molding sand online monitoring method, which is applied to any of the above molding sand online monitoring systems, comprising:

[0071] S1001. Raw materials and water are added into the sand mixer 100 through the feeding device 200 and the water adding device 300 respectively, and then the raw materials and water entering therein are mixed by the sand mixer 100 to obtain molding sand; wherein, the molding sand is usually formed by mixing raw sand (such as silica sand, expanded clay sand, etc.), binder (such as clay, resin, etc.) and other additives (such as coal powder, sawdust, etc.) in a certain proportion.

[0072] S1002. The molding sand in the sand mixer 100 is obtained by the testing device 400 and the quality parameters of the molding sand are tested to obtain the molding sand quality parameter values; wherein the molding sand quality parameter values ​​mainly include compaction rate, wet compressive strength, air permeability, water content (humidity) and temperature.

[0073] S1003. The control device 500 obtains the molding sand quality parameter value and compares the molding sand quality parameter value with the molding sand quality standard value range stored therein. If the molding sand quality parameter value meets the molding sand quality standard value range, the quality of the molding sand is determined to be qualified; otherwise, the quality of the molding sand is determined to be unqualified, and the control device 500 controls the feeding device 200 to add a preset mass of raw materials into the sand mixer 100 or the water adding device 300 to add a preset volume of water into the sand mixer 100.

[0074] The molding sand online monitoring method provided in the present application determines whether the quality of the molding sand is qualified by detecting the quality parameters of the molding sand and comparing the molding sand quality parameter values ​​with the molding sand quality standard values, and timely adjusts the proportions of various raw materials and the amount of water used to prepare the molding sand according to the judgment result, so that the quality parameters of the prepared molding sand meet the standards, thereby ensuring the quality of the molding sand and the quality of the castings made from the molding sand, and further improving the compliance rate of the finished castings.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A molding sand online monitoring system, characterized in that: include: A sand mixer (100), wherein the sand mixer (100) is used to add raw materials and water therein respectively through a material adding device (200) and a water adding device (300) and mix the raw materials and water therein to obtain molding sand; A testing device (400), the testing device (400) is used to obtain the molding sand in the sand mixer (100) and detect the quality parameters of the molding sand to obtain the molding sand quality parameter value; A control device (500), the control device (500) being used to obtain the molding sand quality parameter value and compare the molding sand quality parameter value with the molding sand quality standard value range stored therein, and if the molding sand quality parameter value meets the molding sand quality standard value range, determining that the quality of the molding sand is qualified; Otherwise, it is determined that the quality of the molding sand is unqualified, and the control device (500) controls the feeding device (200) to add a preset mass of raw materials into the sand mixer (100), or the water adding device (300) to add a preset volume of water into the sand mixer (100).

2. The molding sand online monitoring system according to claim 1, characterized in that: The feeding device (200) comprises a storage bin (201) and a feeding pipe (202); The material storage bin (201) is arranged close to the sand mixer (100) and is connected to one end of the feeding pipe (202); the end of the feeding pipe (202) away from the material storage bin (201) is connected to the sand mixer (100); and the feeding pipe (202) is provided with a powder conveying pump (2021) electrically connected to the control device (500).

3. The molding sand online monitoring system according to claim 1, characterized in that: The water adding device (300) comprises a water source (301) and a water adding pipe (302); The water source (301) is in communication with one end of the water supply pipe (302), and one end of the water supply pipe (302) away from the water source (301) is in communication with the sand mixer (100). The water supply pipe (302) is provided with a metering pump (3021) electrically connected to the control device (500).

4. The molding sand online monitoring system according to claim 1, characterized in that: The testing device (400) comprises a first testing unit (401), a second testing unit (402) and a third testing unit (403); The first testing unit (401) is used to detect the temperature and humidity of the molding sand; The second testing unit (402) is used to test the compaction rate and wet compressive strength of the molding sand; The third testing unit (403) is used to test the air permeability of the molding sand; Wherein, the first test unit (401), the second test unit (402) and the third test unit (403) are all electrically connected to the control device (500).

5. The molding sand online monitoring system according to claim 4, characterized in that: The first test unit (401) comprises a sample holding bucket (4011) and a temperature and humidity sensor (4012); The sample holding barrel (4011) is provided with a feed port (600), and a cover plate (601) is detachably provided on the feed port (600); the temperature and humidity sensor (4012) is arranged in the sample holding barrel (4011) and is used to detect the temperature and humidity of the molding sand that enters the sample holding barrel (4011) from the sand mixer (100) through the feed port (600); Wherein, the temperature and humidity sensor (4012) is electrically connected to the control device (500).

6. The molding sand online monitoring system according to claim 4, characterized in that: The second testing unit (402) comprises a compaction rate tester body (4021) and a telescopic member (4022); The compaction rate tester body (4021) is provided with a displacement sensor (801), the telescopic member (4022) is provided on the compaction rate tester body (4021) and a pressure head (800) for pressing down the molding sand in the first sample tube (700) is provided at the telescopic end thereof, and a tension and compression sensor (802) is provided on the telescopic member (4022) near the pressure head (800); Wherein, the telescopic member (4022), the displacement sensor (801) and the tension and compression sensor (802) are all electrically connected to the control device (500).

7. The molding sand online monitoring system according to claim 4, characterized in that: The third testing unit (403) comprises an air permeability tester body (4031); A fixing assembly (900) for fixing a second sample tube (901) containing the molding sand is arranged in the test chamber of the air permeability tester body (4031).

8. The molding sand online monitoring system according to claim 7, characterized in that: The fixing assembly (900) comprises a fixing groove (902) of a preset depth and two supporting plates (903); The fixing groove (902) is provided on the inner bottom surface of the test cavity of the air permeability measuring instrument body (4031), and the two support plates (903) are respectively arranged at the top of the fixing groove (902) and are connected with a fastening bolt (9031) through the thread of the top thereof, and an arc-shaped clamping ring (904) is provided at one end of the fastening bolt (9031) located between the two support plates (903), and a protective layer is provided on one side of the clamping ring (904) for clamping the second sample tube (901).

9. The molding sand online monitoring system according to any one of claims 1 to 8, characterized in that: The sand mixer (100) is connected to a sampling tube (101), a screw conveyor is arranged in the sampling tube (101), the bottom of the sampling tube (101) is connected to a discharge tube (102), and a diaphragm valve (1021) is arranged on the discharge tube (102).

10. A method for online monitoring of molding sand, characterized in that: The molding sand online monitoring system applied to any one of claims 1 to 9, comprising: Add raw materials and water into the sand mixer through a feeding device and a water adding device respectively, and then mix the raw materials and water entering the sand mixer to obtain molding sand; The molding sand in the sand mixer is obtained by a testing device and quality parameters of the molding sand are tested to obtain a molding sand quality parameter value; The molding sand quality parameter value is obtained through the control device and compared with the molding sand quality parameter value and the molding sand quality standard value range stored therein. If the molding sand quality parameter value meets the molding sand quality standard value range, it is determined that the quality of the molding sand is qualified; otherwise, it is determined that the quality of the molding sand is unqualified, and the control device is used to control the feeding device to add a preset mass of raw materials into the sand mixer or the water adding device to add a preset volume of water into the sand mixer.

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