CN114985676B - Molding sand weight monitoring and liquid material correcting system and method for continuous sand mixer - Google Patents
Molding sand weight monitoring and liquid material correcting system and method for continuous sand mixer Download PDFInfo
- Publication number
- CN114985676B CN114985676B CN202210601736.9A CN202210601736A CN114985676B CN 114985676 B CN114985676 B CN 114985676B CN 202210601736 A CN202210601736 A CN 202210601736A CN 114985676 B CN114985676 B CN 114985676B
- Authority
- CN
- China
- Prior art keywords
- sand
- liquid
- weight
- liquid material
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
- B22C5/0472—Parts; Accessories; Controlling; Feeding; Discharging; Proportioning
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to the technical field of sand mixer correction, and discloses a system and a method for monitoring the weight of molding sand and correcting liquid materials of a continuous sand mixer, wherein the system comprises a sand mixer, a sand bin, a liquid material box and a controller; the liquid material box is connected with a sand mixer pipeline, a liquid material pump and a flowmeter are arranged on the connecting pipeline, and the liquid material pump is electrically connected with a frequency converter; the bottom of the sand bin is provided with a control valve; a weight sensor is arranged in the sand mixer; the weight sensor is used for detecting the weight of the molding sand and generating a weight signal, and then sending the weight signal to the controller; the flowmeter is used for detecting the flow of the liquid material and generating a flow signal, and then sending the flow signal to the controller; the controller calculates and compares according to the weight signal and the liquid flow signal and controls the frequency of the frequency converter to adjust the liquid pump. According to the scheme, the optimal proportion of molding sand and liquid materials in the sand mold is achieved through correction, the strength and uniformity of the sand mold are effectively improved, meanwhile, the waste of the molding sand and the liquid materials can be avoided, the molding time cost and the material cost are saved, and the production efficiency is remarkably improved.
Description
Technical Field
The invention relates to the technical field of sand mixer correction, in particular to a system and a method for monitoring the weight of molding sand and correcting liquid materials of a continuous sand mixer.
Background
Along with continuous iteration and upgrading of the technology level, production equipment gradually tends to develop in the directions of light weight, complexity and high reinforcement. Because the sand casting has air permeability, the resistance of the melt in the filling process is effectively reduced, and casting defects such as insufficient casting, air holes, cold shut and the like are avoided, so that the method is an important casting method for preparing high-performance complex components. In the sand casting process, the sand preparation is vital, and a continuous sand mixer is usually used for preparing the sand at present, however, the conventional continuous sand mixer often causes the actual adding proportion of the liquid material and the sand to be inconsistent with the theoretical adding proportion due to factors such as climate, environmental temperature, liquid material quality, sand quality and the like. The mismatching of the liquid material addition amount and the weight of the molding sand can cause too high or too low compactness of the molding sand and larger strength performance difference of different positions of the sand mold, so that the problems of poor air permeability of the sand mold, insufficient strength of the sand mold, easy collapse of the sand mold, easy frame scattering and the like are caused, and the quality of the sand mold and the casting production are seriously influenced. Therefore, the improvement of the precise proportion of the weight of the sand to the addition amount of the liquid in the molding process is an important method for ensuring the quality of the sand mold. However, at present, the technical problem of inconsistent hardness of different positions of the sand mold is conventionally solved by adopting modes of uniform mixing in advance, and the like, so that the molding time is prolonged, the mixture is easy to solidify due to overlong mixing time, the fluidity is reduced, the molding plasticity and the molding quality are reduced, and the production efficiency is seriously reduced. There is currently no research on a correction system and method for the addition amount of molding sand and liquid. Therefore, the system and the method for realizing the weight monitoring and the liquid material correction of the sand of the continuous sand mixer can make up the function deficiency of the continuous sand mixer in the market, and have important significance for preparing high-quality sand moulds and castings.
Disclosure of Invention
The invention aims to provide a system and a method for monitoring the weight of molding sand and correcting liquid materials of a continuous sand mixer, which are used for solving the technical problem that the strength of different positions of a sand mold is inconsistent in the continuous sand mixing process due to the fact that the actual adding proportion of the molding sand and the liquid materials is different from a theoretical value in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme: a molding sand weight monitoring and liquid material correcting system of a continuous sand mixer comprises a sand mixer, a sand bin, a liquid material box and a controller;
the liquid material box is connected with a sand mixer pipeline, a liquid material pump and a flowmeter are arranged on the connecting pipeline, and the liquid material pump is used for adjusting the liquid material amount entering the sand mixer; the flowmeter is used for detecting a liquid flow signal; the liquid pump is electrically connected with a frequency converter;
the bottom of the sand bin is provided with a control valve which is used for adjusting the quantity of molding sand entering the sand mixer, and a weight sensor is arranged in the sand mixer;
the control valve, the weight sensor, the flowmeter and the frequency converter are all electrically connected with the controller;
the weight sensor is used for detecting the weight of the molding sand entering the sand mixer and generating a weight signal, and then sending the weight signal to the controller;
the flowmeter is used for detecting the flow of liquid materials in the liquid outlet device and generating a flow signal, and then sending the flow signal to the controller;
the controller calculates the liquid cooking theory addition according to the weight signal, compares the theoretical addition with the liquid flow signal and controls the frequency of the frequency converter to adjust the liquid pump.
The principle of the scheme is as follows:
according to the technical scheme, the weight sensor monitors the weight signal of molding sand entering the sand mixer in real time, the weight signal of molding sand is transmitted to the controller, then the controller calculates the required theoretical liquid amount according to the received weight signal of molding sand and the mass ratio of molding sand liquid, then the theoretical liquid amount is compared with the actual liquid amount detected by the flowmeter, and the frequency of the frequency converter is controlled according to the specific comparison result, so that the conveying flow of the liquid pump is regulated, and the correction of the liquid addition amount is realized.
The advantage of this scheme is:
1. compared with the prior sand mixer which is fed according to a theoretical input value, the scheme monitors the quantity of the entered molding sand in real time, and corrects the quantity of liquid materials entering the sand mixer according to the quantity of the molding sand which is changed in real time, so that the quantity of the molding sand entering the sand mixer and the quantity of the liquid materials are infinitely approximate to the theoretical ratio, the uniformity of the liquid materials of the molding sand is realized, the uniformity of the prepared sand mold is improved, and the quality of the sand mold is improved. The applicant experiment proves that the corrected sand mould has more uniform quality, the strength deviation of different positions of the sand mould is +/-0.2 MPa, and the strength deviation is obviously lower than the uncorrected sand mould strength deviation +/-0.64 MPa, so that the sand mould quality is improved.
2. Compared with the existing sand mixer, the feeding is uncorrected, the method has the advantages that the addition of the liquid material is corrected, so that the accuracy of the addition of the molding sand and the liquid material is obviously improved, and the phenomenon that the molding sand is insufficient in strength and even the sand collapses and fails in molding in the molding process due to the fact that the mixed molding sand and liquid material are far from the theoretical ratio because the addition is not corrected in the prior art is avoided. In addition, this scheme makes molding sand and liquid material reach the optimal ratio in the sand mould through the correction, effectively promotes sand mould intensity and homogeneity, can also avoid simultaneously the waste of molding sand and liquid material, practices thrift figurative time cost and material cost, is showing and is promoting production efficiency.
3. Compared with the prior sand mixer for preparing sand molds by using different types of sand, the method adopts the molding sand with uniform quality and liquid material to form the mixture and uses the mixture for molding, and the obtained sand molds have uniform quality and high molding speed, so that the production efficiency of the sand molds is remarkably improved.
Preferably, the sand mixer comprises a large arm and a small arm which are connected in a rotating way, wherein the large arm and the small arm are communicated with each other, a conveying belt is arranged in the large arm, and a driving device of the conveying belt is electrically connected with the controller; the weight sensor is located below the conveying belt, and the feeding end of the conveying belt is located right below the outlet of the control valve. By adopting the scheme, the feeding of the molding sand and the real-time monitoring of the molding sand addition are conveniently realized, so that the liquid material addition is corrected in real time according to the molding sand addition.
Preferably, a spiral propeller is arranged in the small arm, and a driving part of the spiral propeller is electrically connected with the controller; the small arm is further provided with a plurality of liquid material adding holes, the liquid material box is connected with the liquid material adding holes in a one-to-one pipeline manner, and each connecting pipeline is provided with a liquid material pump and a flowmeter. By adopting the scheme, the feeding of various liquid materials is convenient, and the feeding amount of each liquid material is independently corrected.
Preferably, a spraying device is arranged in the liquid material adding hole. By adopting the scheme, the liquid material is in mist diffusion, so that the liquid material and the molding sand are convenient to fully mix, and the uniformity of the mixture is improved.
Preferably, a temperature sensor is further arranged in the large arm, and the temperature sensor is electrically connected with the controller; the temperature sensor is used for detecting the temperature of the molding sand entering the sand mixer and generating a temperature signal, and then transmitting the temperature signal to the controller; the controller calculates the liquid cooking theory addition according to the temperature signal and the weight signal and controls the frequency of the frequency converter so as to adjust the liquid pump. In long-term production, the applicant finds that the weight, temperature and liquid addition amount of the molding sand jointly affect the quality of the sand mold, so that the liquid addition amount calculated by comprehensively considering the weight signal and the temperature signal of the sand mold is easier to mold and obtain the high-quality sand mold. By adopting the scheme, various factors influencing the quality of the sand mould are conveniently and comprehensively considered, so that the quality and uniformity of the sand mould are improved.
Preferably, the controller is further electrically connected with a display screen, and the display screen is used for displaying the addition amount of the sand mold and the liquid material and fault display. By adopting the scheme, operators can monitor the modeling process and possible faults thereof conveniently.
A molding sand weight monitoring and liquid material correcting method for a continuous sand mixer comprises the following steps:
s1: starting, wherein the controller controls the continuous sand mixer, the control valve and the liquid pump to start;
s2: a signal detection, wherein a weight sensor detects the weight of the molding sand and generates a weight signal, and then the weight signal is transmitted to a controller; the temperature sensor detects the temperature of the molding sand and generates a temperature signal, which is then sent to the controller; the flowmeter detects the flow of the liquid material and generates a flow signal, and then sends the flow signal to the controller;
s3: the controller calculates and compares the received signals, and controls the frequency of the frequency converter according to the comparison result to correct the flow of the liquid pump so as to realize the correction of the liquid addition;
s4: molding, wherein the screw propeller of the small arm mixes molding sand and liquid material entering the small arm, and the mixture is used for sand filling molding.
The principle and the advantages of the scheme are as follows:
1. compared with the direct raw material adding without correction in the prior art, the method has the advantages that the raw material adding amount is corrected, so that the adding proportion of the raw materials is infinitely close to the theoretical adding proportion, the accurate control of raw material adding is realized, the uniformity of modeling quality is ensured, and the production efficiency is improved.
2. Compared with the prior art, the small arm completes mixing of molding sand and liquid materials through spiral propulsion, so that mixing time is saved, and molding efficiency is improved; simultaneously, the mode of this scheme screw propulsion mixes effectively avoids appearing the phenomenon that the molding quality is poor because of the mixture plasticity after alone mixing reduces in the prior art, has promoted molding quality.
Preferably, in S1, the method further includes inputting the required addition proportions of molding sand and liquid materials of different sand molds into the controller for coding before starting the sand mixer, and selecting the corresponding addition proportions of molding sand and liquid materials according to the sand molds when starting the continuous sand mixer. By adopting the scheme, molding is conveniently carried out according to the addition proportion of molding sand and liquid materials required by different sand molds, input and operation time during molding are saved by coding in advance, meanwhile, operation steps are conveniently saved by defining in advance in a coding mode, the equipment is suitable for any operator, and the application range of the equipment is increased.
Preferably, the liquid material comprises a curing agent and resin, wherein the mass ratio of the molding sand to the resin is 1:0.8-1.2%, and the mass ratio of the curing agent to the resin is 0.3-0.5:1. By adopting the scheme, the sand mold with higher strength is convenient to prepare, so that the quality of the sand mold is improved, and the service life of the sand mold is prolonged.
Preferably, in S3, the system further includes an alarm program and a compensation correction program, where the alarm program is used to start the compensation correction program when the adjustment of the liquid addition amount by the liquid pump fails, and the compensation correction program includes a controller that calculates the theoretical addition amount of molding sand according to the flow signal fed back by the flowmeter and controls the opening of the control valve.
In the actual production process, the actual addition proportion of molding sand and liquid materials cannot be consistent with the theoretical addition proportion due to the fact that the liquid materials are not corrected by the liquid material correction program due to equipment aging, poor sealing performance and the like. By adopting the scheme, the bidirectional correction of raw material addition can be realized, the continuous sand mixer is convenient for continuously correcting the raw material addition amount, continuous production is realized, and the production efficiency and the equipment service life are improved. Especially when the liquid material correction fails, the scheme can still correct the addition amount of the molding sand through the compensation correction program, so that the waste of the molding sand is avoided.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a system in embodiment 1 of the present invention.
Fig. 2 is a schematic flow chart of the calibration method in embodiment 1 of the present invention.
FIG. 3 is a schematic diagram of sand mold and sampling points in example 1 of the present invention.
Fig. 4 is a schematic diagram of a correction flow chart of the compensation correction procedure in embodiment 10 of the present invention.
Detailed Description
The following is a further detailed description of the embodiments:
reference numerals in the drawings of the specification include: the sand silo 1, the control valve 11, the liquid material box 2, the liquid material pump 21, the flowmeter 22, the sand mixer 3, the big arm 31, the weight sensor 311, the temperature sensor 312, the first motor 313, the small arm 32, the liquid material adding hole 321, the second motor 322 and the sand box 4.
Example 1
This embodiment is basically as shown in fig. 1: a molding sand weight monitoring and liquid material correcting system of a continuous sand mixer comprises a sand mixer 3, a sand bin 1, a liquid material box 2 and a controller;
the bottom of the sand bin 1 is provided with a control valve 11, the control valve 11 is electrically connected with a controller, and the control valve 11 is used for adjusting the quantity of the molding sand entering the sand mixer 3;
the sand mixer 3 comprises a large arm 31 and a small arm 32 which are rotationally connected, wherein the large arm 31 is communicated with the small arm 32, a conveying belt is stretched in the large arm 31, the feeding end of the conveying belt is positioned right below the outlet of the control valve 11, and the outlet end of the conveying belt is positioned right above the small arm 32; a driving roller and a driven roller are respectively fixed inside the two ends of the conveying belt, and a fixing plate is fixed between the driving roller and the driven roller; the driving roller is positioned at the outlet end, is provided with a driving device and is fixedly connected with the power output end of the driving device, and the driving device is electrically connected with the controller, and in the embodiment, the driving device is specifically a first motor 313; a weight sensor 311 is arranged below the conveyor belt, the weight sensor 311 is electrically connected with the controller, the weight sensor 311 is used for detecting the weight of molding sand entering the conveyor belt and generating a weight signal, and then the weight signal is sent to the controller, and the weight sensor 311 is fixed on the fixed plate in the embodiment; a temperature sensor 312 is fixedly connected to the inside of the large arm 31 above the conveyor belt, the temperature sensor 312 is electrically connected to the controller, and the temperature sensor 312 is used to detect the temperature of the molding sand entering the large arm 31 and generate a temperature signal, which is then sent to the controller.
The small arm 32 is internally provided with a spiral propeller, a driving part of the spiral propeller is electrically connected with the controller, and the driving part is a second motor 322 in the embodiment; the small arm 32 is also provided with a plurality of liquid material adding holes 321, in this embodiment, three liquid material adding holes 321 are specifically arranged on the small arm 32 in an axial direction at equal intervals; each liquid material adding hole 321 is connected with the liquid material box 2 of each liquid material in a one-to-one pipeline manner, each connecting pipeline is provided with a liquid material pump 21 and a flowmeter 22, each liquid material pump 21 is electrically connected with a frequency converter, and all the frequency converters and the flowmeter 22 are electrically connected with the controller; the flowmeter 22 is used for detecting a liquid flow signal of the liquid flow refrigerator in the liquid outlet device and then sending the signal to the controller; the controller calculates the theoretical addition amount of the liquid material according to the received weight signal and temperature signal, compares the theoretical addition amount with the liquid material flow signal and controls the frequency of the frequency converter to adjust the liquid material pump 21.
The spraying device is installed in each liquid material adding hole 321, and the spraying device is specifically a nozzle, so that liquid materials can be conveniently diffused into the small arms 32 in a mist mode, and are mixed with molding sand in the small arms 32, and the mist liquid materials are convenient for the full mixing of the liquid materials and the molding sand, so that the uniformity of the mixture is improved. The sand box 4 is placed right below the discharging end of the small arm 32, so that the mixture conveyed in the small arm 32 can be molded conveniently.
The controller is also electrically connected with a display screen, in this embodiment, the controller is specifically a PLC controller (not shown in the figure), and the display screen is used for displaying the adding amounts of the sand mold and the liquid material and fault display (the PLC controller, the weight sensor 311, the temperature sensor 312, the control valve 11, the display screen, the liquid meter and the frequency converter are in the prior art, and the model can be selected according to the actual needs).
The scheme also provides a method for monitoring the weight of the 3 molding sand of the continuous sand mixer and correcting the liquid material, which is completed by the system for monitoring the weight of the 3 molding sand of the continuous sand mixer and correcting the liquid material, and adopts a flow chart shown in figure 2, and comprises the following steps:
s1: inputting information, namely inputting the addition ratio of molding sand and liquid materials required by different sand molds into a PLC controller, wherein the mass ratio of the molding sand to the resin is 1:0.8-1.2%, and the mass ratio of the curing agent to the resin is 0.3-0.5:1;
the casting outline size adopted in the embodiment is 811mm multiplied by 570mm multiplied by 466mm, the liquid material comprises two curing agents and resin, and the mass ratio of molding sand to resin is 1:1%; the mass ratio of the curing agent to the resin is 0.5:1, and the mass ratio of the two curing agents is 1:1; therefore, the mass ratio of the molding sand, the curing agent 1, the curing agent 2 and the resin is that the molding sand is that the curing agent 1 is that the curing agent 2 is that the resin=1:0.25% is that the curing agent 2 is that the resin is 0.25% is 1%.
S2: and starting, wherein the PLC controls the continuous sand mixer 3, the control valve 11 and the liquid pump 21 to start, and when the continuous sand mixer 3 is started, the corresponding molding sand and liquid adding proportion is selected according to the sand mold.
S2: a signal detection, wherein the weight sensor 311 detects the weight of the molding sand and generates a weight signal, which is then transmitted to the PLC controller; the temperature sensor 312 detects the temperature of the molding sand and generates a temperature signal, which is then transmitted to the PLC controller; the flow meter 22 detects the flow rate of the liquid material and generates a flow rate signal, which is then sent to the PLC controller;
in the long-term production time of the applicant, the weight, the temperature and the liquid material addition amount of the molding sand are found to have important influence on the molding quality, so that the liquid material addition amount calculated by comprehensively considering the weight signal and the temperature signal of the sand mold is easier to mold and obtain the high-quality sand mold.
Wherein the sand weight sensor 311 monitors the weight of the sand on the conveyor in real time and transmits a sand weight signal to the PLC controller;
the temperature sensor 312 detects the temperature of the molding sand entering the large arm 31 in real time and generates a temperature signal, which is then sent to the PLC controller;
as the resin is conveyed past the resin flow meter 22, the flow meter 22 detects its actual flow and generates a flow signal, which is then sent to the PLC controller;
as the curing agent is conveyed through the curing agent flow meter 22, the flow meter 22 detects its actual flow and generates a flow signal, which is then sent to the PLC controller;
s3: correcting, namely, the PLC calculates and compares according to the received signals, and controls the frequency of the frequency converter according to the comparison result so as to correct the flow of the liquid material pump 21, thereby realizing correction of the liquid material addition amount;
the PLC calculates theoretical addition amount of the liquid materials according to the real-time molding sand weight signal and the set molding sand liquid material addition proportion, compares the theoretical addition amount with a resin flow signal and a curing agent flow signal to obtain correction signals of the resin and the curing agent, and acts on the frequency converter to change the frequency converter hertz, so that the correction of the addition amount of the resin and the curing agent is realized;
the PLC continuously calculates the weight monitoring of the molding sand and the correction of the liquid material through the weight signal of the molding sand, the temperature signal, the resin flow signal and the curing agent flow signal, so that the real-time adding amount of the liquid material reaches a theoretical set value; the calculation formulas of the theoretical addition amount of the curing agent and the theoretical addition amount of the resin are specifically as follows:
theoretical resin addition: actual sand weight = 0.5%:1→theoretical resin addition amount=0.5% by weight of actual molding sand
Theoretical curing agent addition: theoretical resin addition=0.5:1→theoretical hardener addition=0.5 theoretical resin addition
S4: the auger of the arm 32 mixes the molding sand and the liquid material that enter the arm 32, and uses the mixture for sand-filling molding.
Molding sand enters from the inlet end of the small arm 32, liquid enters from the liquid adding hole 321 on the side wall of the small arm 32, the liquid is sprayed into the small arm 32 by a nozzle and is mixed with the molding sand which is spirally pushed in the small arm 32, and the atomized liquid is convenient for the full mixing of the liquid and the molding sand, so that the uniformity of the mixture is improved.
Filling the mixture into the sand box 4 from the discharge end of the small arm 32 to finish sand filling molding; and taking out the sand mould after the sand mould is hardened.
In order to verify the accuracy and effectiveness of the sand weight monitoring and liquid material correcting method, the 9-point method is adopted to sample different parts of the sand mold (the sampling points are shown in fig. 3 in detail), the strength of the sand mold with 9 sampling points is tested, the strength of the sand mold prepared by the sand weight monitoring and liquid material correcting method is found by comparing the strength of 9 samples, the strength of each part of the sand mold is basically consistent, the deviation of the strength of the sand mold is within +/-0.2 MPa, and the consistency of the strength of the sand mold is obviously improved, so that the quality of the sand mold is improved.
Examples 2-9 were molded using the system and method of example 1, with the difference that different molding sand liquid addition ratios were used for molding; comparative examples 1 to 9 show that the modeling was performed without starting the correction program; the addition ratios of the molding sand and the liquid materials in examples 1 to 9 and comparative examples 1 to 9 and the differences in the strength deviations of the molded sand mold after molding are shown in Table 1.
TABLE 1 ratio of addition of Molding sand to liquid Material in examples 1 to 9 and comparative examples 1 to 9 and strength deviation of the molded Sand mold
| Examples | Mass ratio of molding sand to liquid material | Mass ratio of resin to curing agent in liquid material | Sand mould strength deviation/MPa |
| Example 1 | 1:1％ | 1:0.5 | ±0.20 |
| Example 2 | 1:1％ | 1:0.3 | ±0.16 |
| Example 3 | 1:0.8％ | 1:0.5 | ±0.18 |
| Example 4 | 1:0.8％ | 1:0.3 | ±0.12 |
| Example 5 | 1:1.2％ | 1:0.5 | ±0.15 |
| Example 6 | 1:1.2％ | 1:0.3 | ±0.12 |
| Example 7 | 1:1％ | 1:0.4 | ±0.18 |
| Example 8 | 1:0.8％ | 1:0.4 | ±0.16 |
| Example 9 | 1:1.2％ | 1:0.4 | ±0.14 |
| Comparative example 1 | 1:1％ | 1:0.5 | ±0.42 |
| Comparative example 2 | 1:1％ | 1:0.3 | ±0.35 |
| Comparative example 3 | 1:0.8％ | 1:0.5 | ±0.53 |
| Comparative example 4 | 1:0.8％ | 1:0.3 | ±0.40 |
| Comparative example 5 | 1:1.2％ | 1:0.5 | ±0.64 |
| Comparative example 6 | 1:1.2％ | 1:0.3 | ±0.45 |
| Comparative example7 | 1:1％ | 1:0.4 | ±0.38 |
| Comparative example 8 | 1:0.8％ | 1:0.4 | ±0.50 |
| Comparative example 9 | 1:1.2％ | 1:0.4 | ±0.53 |
Experimental data show that the molding is carried out by adopting different molding sand liquid material adding ratios, and the molding can be successfully carried out within the range of the molding sand liquid material adding ratios. However, the strength deviation of the sand mold obtained by the correction procedure (example 1-example 9) at different positions is obviously smaller than that of the sand mold obtained by the correction procedure (comparative example 1-comparative example 9) at different positions, and the correction system and the correction method used by the scheme are fully proved to be capable of obviously improving the uniformity of the sand mold, thereby improving the quality of the sand mold.
According to the scheme, the entering molding sand amount is monitored in real time, the liquid material amount entering the sand mixer 3 is corrected according to the molding sand amount which is changed in real time, so that the molding sand amount and the liquid material amount entering the sand mixer 3 approach to the theoretical ratio infinitely, the uniformity of the molding sand liquid material ratio is realized, the uniformity of the prepared sand mold is improved, and the quality of the sand mold is improved.
Meanwhile, the method and the device have the advantages that the addition amount of the liquid material is corrected, so that the accuracy of the addition amount of the molding sand and the liquid material is remarkably improved, and the phenomenon that the molding failure caused by insufficient strength of the sand mold and even sand collapse in the molding process due to the fact that the mixed molding sand and liquid material are far from the theoretical ratio because the addition amount is not corrected in the prior art is avoided. In addition, this scheme makes molding sand and liquid material reach the optimal ratio in the sand mould through the correction, effectively promotes sand mould intensity and homogeneity, can also avoid simultaneously the waste of molding sand and liquid material, practices thrift figurative time cost and material cost, is showing and is promoting production efficiency.
Example 10
In order to further improve the continuity and accuracy of the correction, the present embodiment is different from embodiment 1 in that, using the flowchart shown in fig. 4, the controller includes an alarm program for starting the compensation correction program when the control of the liquid pump 21 fails to adjust the liquid addition amount, and a compensation correction program including the controller calculating the theoretical addition amount of molding sand according to the flow rate signal fed back from the flow meter 22 and controlling the opening of the control valve 11; the calculation formula of the theoretical addition amount of the molding sand is specifically as follows:
taking the actual addition amount (actual flow) of the resin as a calculation reference:
theoretical sand addition: actual resin addition amount=1: 0.5% → theoretical addition of sand = actual resin addition/0.5%;
theoretical curing agent addition: actual resin addition = 0.5:1→theoretical hardener addition = 0.5 actual resin addition;
or, taking the actual adding amount (actual flow) of the curing agent as a calculation reference:
theoretical resin addition: actual curing agent addition = 1:0.5→theoretical resin addition = actual curing agent addition/0.5;
theoretical sand addition: theoretical resin addition = 1:0.5% → theoretical addition of sand = actual resin addition/0.5%; .
In the embodiment, the bidirectional correction of raw material addition can be realized, the continuous sand mixer 3 can be convenient for continuously correcting the raw material addition amount, continuous production is realized, and the production efficiency and the service life of equipment are improved. The method comprises the following steps: when equipment ages and causes liquid material correction failure, the scheme starts an alarm program and transmits an alarm signal to the PLC controller, and when the PLC controller receives the alarm signal, a compensation correction program is started, and at the moment, the PLC controller calculates the theoretical addition amount of the molding sand according to a flow signal fed back by the flowmeter 22, compares the theoretical addition amount of the molding sand with the actual addition amount of the molding sand detected by the weight sensor 311, and controls the opening degree of the control valve 11 according to a comparison result so as to correct the addition amount of the molding sand, thereby avoiding the waste of the molding sand. Compared with the prior art that the equipment aging alarm interrupts the sand mould being molded and stops production, the scheme can realize continuous production through the compensation correction program; after the sand mould being molded is finished, equipment is stopped for maintenance, so that continuous production is facilitated.
The foregoing is merely exemplary of the present invention, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present invention, and these should also be regarded as the protection scope of the present invention, which does not affect the effect of the implementation of the present invention and the practical applicability of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (9)
1. A molding sand weight monitoring and liquid material correcting system of a continuous sand mixer is characterized in that: comprises a sand mixer, a sand bin, a liquid material box and a controller; the liquid material box is connected with a sand mixer pipeline, a liquid material pump and a flowmeter are arranged on the connecting pipeline, and the liquid material pump is used for adjusting the liquid material amount entering the sand mixer; the flowmeter is used for detecting a liquid flow signal; the liquid pump is electrically connected with a frequency converter; the bottom of the sand bin is provided with a control valve which is used for adjusting the quantity of molding sand entering the sand mixer, and a weight sensor is arranged in the sand mixer; the control valve, the weight sensor, the flowmeter and the frequency converter are all electrically connected with the controller;
the weight sensor is used for detecting the weight of the molding sand entering the sand mixer and generating a weight signal, and then sending the weight signal to the controller; the flowmeter is used for detecting the flow of liquid materials in the liquid outlet device and generating a flow signal, and then sending the flow signal to the controller; the controller calculates the liquid cooking theory addition according to the weight signal, compares the theoretical addition with the liquid flow signal and controls the frequency of the frequency converter to adjust the liquid pump;
the system also comprises an alarm program and a compensation correction program, wherein the alarm program is used for starting the compensation correction program when the liquid pump fails to adjust the liquid addition amount, and the compensation correction program comprises a controller for calculating the theoretical addition amount of the molding sand according to a flow signal fed back by the flowmeter and controlling the opening of the control valve.
2. The sand weight monitoring and fluid correction system for a continuous sand mixer according to claim 1, wherein: the sand mixer comprises a large arm and a small arm which are connected in a rotating way, wherein the large arm is communicated with the small arm, a conveying belt is arranged in the large arm, and a driving device of the conveying belt is electrically connected with a controller; the weight sensor is located below the conveying belt, and the feeding end of the conveying belt is located right below the outlet of the control valve.
3. A sand weight monitoring and fluid correction system for a continuous mixer according to claim 2, characterized in that: a spiral propeller is arranged in the small arm, and a driving part of the spiral propeller is electrically connected with a controller; the small arm is further provided with a plurality of liquid material adding holes, the liquid material box is connected with the liquid material adding holes in a one-to-one pipeline manner, and each connecting pipeline is provided with a liquid material pump and a flowmeter.
4. A sand weight monitoring and fluid correction system for a continuous mixer according to claim 3, characterized in that: and a spraying device is arranged in the liquid material adding hole.
5. The sand weight monitoring and fluid material correcting system for a continuous sand mixer according to claim 4, wherein: a temperature sensor is further arranged in the large arm and is electrically connected with the controller; the temperature sensor is used for detecting a temperature signal of the molding sand entering the sand mixer and transmitting the temperature signal to the controller; the controller calculates the liquid cooking theory addition according to the temperature signal and the weight signal and controls the frequency of the frequency converter so as to adjust the liquid pump.
6. The sand weight monitoring and fluid correction system for a continuous mixer according to claim 5, wherein: the controller is also electrically connected with a display screen, and the display screen is used for displaying the addition amount of the sand mold and the liquid material and fault display.
7. A method for monitoring and correcting the weight of molding sand of a continuous sand mixer, which is accomplished by a system for monitoring and correcting the weight of molding sand of a continuous sand mixer, according to any one of claims 1 to 6, wherein: the method comprises the following steps:
s1: starting, wherein the controller controls the continuous sand mixer, the control valve and the liquid pump to start;
s2: a signal detection, wherein a weight sensor detects the weight of the molding sand and generates a weight signal, and then the weight signal is transmitted to a controller; the temperature sensor detects the temperature of the molding sand and generates a temperature signal, which is then sent to the controller; the flowmeter detects the flow of the liquid material and generates a flow signal, and then sends the flow signal to the controller;
s3: the controller calculates and compares the received signals, and controls the frequency of the frequency converter according to the comparison result to correct the flow of the liquid pump so as to realize the correction of the liquid addition;
s4: molding, wherein the screw propeller of the small arm mixes molding sand and liquid material entering the small arm, and the mixture is used for sand filling molding.
8. The method for monitoring and correcting the weight of molding sand and liquid materials of a continuous sand mixer according to claim 7, wherein the method comprises the following steps: in S1, the method further comprises inputting the required molding sand and liquid material adding proportion of different sand molds into a controller for coding before starting the sand mixer, and selecting the corresponding molding sand and liquid material adding proportion according to the sand molds when starting the continuous sand mixer.
9. The method for monitoring the weight of molding sand and correcting the liquid material of a continuous sand mixer according to claim 8, wherein the method comprises the following steps: the liquid material comprises a curing agent and resin, wherein the mass ratio of the molding sand to the resin is 1:0.8-1.2%, and the mass ratio of the curing agent to the resin is 0.3-0.5:1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311035214.8A CN117139555A (en) | 2022-05-30 | 2022-05-30 | Molding method of sand mold |
| CN202210601736.9A CN114985676B (en) | 2022-05-30 | 2022-05-30 | Molding sand weight monitoring and liquid material correcting system and method for continuous sand mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210601736.9A CN114985676B (en) | 2022-05-30 | 2022-05-30 | Molding sand weight monitoring and liquid material correcting system and method for continuous sand mixer |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311035214.8A Division CN117139555A (en) | 2022-05-30 | 2022-05-30 | Molding method of sand mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114985676A CN114985676A (en) | 2022-09-02 |
| CN114985676B true CN114985676B (en) | 2023-08-08 |
Family
ID=83031975
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311035214.8A Pending CN117139555A (en) | 2022-05-30 | 2022-05-30 | Molding method of sand mold |
| CN202210601736.9A Active CN114985676B (en) | 2022-05-30 | 2022-05-30 | Molding sand weight monitoring and liquid material correcting system and method for continuous sand mixer |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311035214.8A Pending CN117139555A (en) | 2022-05-30 | 2022-05-30 | Molding method of sand mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN117139555A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116212750A (en) * | 2023-05-06 | 2023-06-06 | 河北环恒科技有限公司 | Automatic control system and method for batch dripping for polycarboxylate superplasticizer mother liquor production |
| CN117300057A (en) * | 2023-11-28 | 2023-12-29 | 康硕(山西)智能制造有限公司 | Equipment for filling sand box during precision casting |
| CN118080776B (en) * | 2024-04-17 | 2024-07-05 | 潍坊晟林铸造机械有限公司 | Double auxiliary material adding type metering rechecking sand mixer |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE896819A (en) * | 1982-05-24 | 1983-09-16 | Standard Oil Co | SYSTEM FOR REGULATING MELTED FLUIDITY IN A CONTINUOUS LINE. |
| JPH07124687A (en) * | 1993-10-29 | 1995-05-16 | Taiyo Setsubi Kk | Device for monitoring charging amount of additive and alarming in continuous kneading machine |
| JP2001150092A (en) * | 1999-11-24 | 2001-06-05 | Aisin Takaoka Ltd | Ajusting method and device for kneading molding sand |
| JP2005125338A (en) * | 2003-10-21 | 2005-05-19 | Sintokogio Ltd | Device of managing continuous kneading machine |
| DE102007027298A1 (en) * | 2007-06-11 | 2008-12-18 | Maschinenfabrik Gustav Eirich Gmbh & Co. Kg | Process for the treatment of foundry sand |
| CN201470819U (en) * | 2009-08-05 | 2010-05-19 | 柏晓光 | Intelligent sand mixer |
| CN102000765A (en) * | 2010-11-22 | 2011-04-06 | 漯河市大华铸造机械有限责任公司 | Liquid material addition synchronous display system for resin sand continuous sand mill |
| CN202224590U (en) * | 2011-08-30 | 2012-05-23 | 杭州联源重工机械有限公司 | Foundry resin sand flow proportioning control instrument |
| CN203578672U (en) * | 2013-09-24 | 2014-05-07 | 常州市卓信机电设备制造有限公司 | Liquid material control device for sand mixer in furan resin molding process |
| CN204148444U (en) * | 2014-10-09 | 2015-02-11 | 四川法拉特不锈钢铸造有限公司 | Puddle mixer liquid material transport control system |
| CN106311971A (en) * | 2015-06-30 | 2017-01-11 | 共享装备有限公司 | Liquid material control system of sand mixer |
| CN206122624U (en) * | 2016-09-27 | 2017-04-26 | 苏州欣苏诚铸造机械有限公司 | Be used for figurative liquid of mulling material intelligence control system |
| CN107999696A (en) * | 2018-01-18 | 2018-05-08 | 长泰县恒鑫机械铸造有限公司 | A kind of intelligent resin sand continuous sand mixing device and control method |
| CN110193585A (en) * | 2019-04-25 | 2019-09-03 | 青岛双星智能铸造装备有限公司 | A kind of stepless adjustable control system of sand mixer mulling and its control method |
| CN111842809A (en) * | 2020-08-13 | 2020-10-30 | 无锡锡南铸造机械股份有限公司 | Intelligent sand mixer system |
| CN212350348U (en) * | 2020-05-29 | 2021-01-15 | 重庆林洲机械制造有限公司 | Full-automatic casting equipment |
| CN212551593U (en) * | 2020-05-20 | 2021-02-19 | 共赢装备制造有限公司 | Movable intelligent sand mixer |
| TWM614282U (en) * | 2021-02-02 | 2021-07-11 | 呈聯金屬股份有限公司 | Sand mixer control system |
-
2022
- 2022-05-30 CN CN202311035214.8A patent/CN117139555A/en active Pending
- 2022-05-30 CN CN202210601736.9A patent/CN114985676B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE896819A (en) * | 1982-05-24 | 1983-09-16 | Standard Oil Co | SYSTEM FOR REGULATING MELTED FLUIDITY IN A CONTINUOUS LINE. |
| JPH07124687A (en) * | 1993-10-29 | 1995-05-16 | Taiyo Setsubi Kk | Device for monitoring charging amount of additive and alarming in continuous kneading machine |
| JP2001150092A (en) * | 1999-11-24 | 2001-06-05 | Aisin Takaoka Ltd | Ajusting method and device for kneading molding sand |
| JP2005125338A (en) * | 2003-10-21 | 2005-05-19 | Sintokogio Ltd | Device of managing continuous kneading machine |
| DE102007027298A1 (en) * | 2007-06-11 | 2008-12-18 | Maschinenfabrik Gustav Eirich Gmbh & Co. Kg | Process for the treatment of foundry sand |
| CN201470819U (en) * | 2009-08-05 | 2010-05-19 | 柏晓光 | Intelligent sand mixer |
| CN102000765A (en) * | 2010-11-22 | 2011-04-06 | 漯河市大华铸造机械有限责任公司 | Liquid material addition synchronous display system for resin sand continuous sand mill |
| CN202224590U (en) * | 2011-08-30 | 2012-05-23 | 杭州联源重工机械有限公司 | Foundry resin sand flow proportioning control instrument |
| CN203578672U (en) * | 2013-09-24 | 2014-05-07 | 常州市卓信机电设备制造有限公司 | Liquid material control device for sand mixer in furan resin molding process |
| CN204148444U (en) * | 2014-10-09 | 2015-02-11 | 四川法拉特不锈钢铸造有限公司 | Puddle mixer liquid material transport control system |
| CN106311971A (en) * | 2015-06-30 | 2017-01-11 | 共享装备有限公司 | Liquid material control system of sand mixer |
| CN206122624U (en) * | 2016-09-27 | 2017-04-26 | 苏州欣苏诚铸造机械有限公司 | Be used for figurative liquid of mulling material intelligence control system |
| CN107999696A (en) * | 2018-01-18 | 2018-05-08 | 长泰县恒鑫机械铸造有限公司 | A kind of intelligent resin sand continuous sand mixing device and control method |
| CN110193585A (en) * | 2019-04-25 | 2019-09-03 | 青岛双星智能铸造装备有限公司 | A kind of stepless adjustable control system of sand mixer mulling and its control method |
| CN212551593U (en) * | 2020-05-20 | 2021-02-19 | 共赢装备制造有限公司 | Movable intelligent sand mixer |
| CN212350348U (en) * | 2020-05-29 | 2021-01-15 | 重庆林洲机械制造有限公司 | Full-automatic casting equipment |
| CN111842809A (en) * | 2020-08-13 | 2020-10-30 | 无锡锡南铸造机械股份有限公司 | Intelligent sand mixer system |
| TWM614282U (en) * | 2021-02-02 | 2021-07-11 | 呈聯金屬股份有限公司 | Sand mixer control system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117139555A (en) | 2023-12-01 |
| CN114985676A (en) | 2022-09-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114985676B (en) | Molding sand weight monitoring and liquid material correcting system and method for continuous sand mixer | |
| KR20210149022A (en) | How to Calibrate Liquid Flow Meters | |
| CN102174791A (en) | Cold recycling plant mixing equipment of asphalts | |
| CN214977525U (en) | Online automatic sand mixing device of sand mould 3D printer | |
| CN109352821B (en) | Concrete batching, stirring and conveying system and control method thereof | |
| CN209917799U (en) | Many liquid of many functional types add system | |
| CN202031007U (en) | Plantmix equipment for asphalt cold regeneration | |
| CN110539401A (en) | Method for preparing foamed light soil for railway roadbed | |
| CN109130060B (en) | Control system of latex foaming machine of intelligence high accuracy ratio | |
| CN205052660U (en) | Automatic flour -mixing machine of weighing of adding water | |
| CN209901125U (en) | A constant speed liquid feeding stirred tank for coating production | |
| CN112495716A (en) | Control system of high-proportion non-intermittent dispensing feeding equipment | |
| CN110560335A (en) | Online mixing and feeding system | |
| CN210561592U (en) | Asphalt metering and spraying discharging device | |
| CN214716401U (en) | Material ration compounding device for building | |
| CN116637552A (en) | Full-automatic integrated proportioning system suitable for powdered medicament | |
| CN212102697U (en) | Modified asphalt apparatus for producing | |
| CN112030669B (en) | Continuous asphalt mixture plant-mixing hot recycling combined equipment | |
| CN112248437B (en) | Silicone rubber liquid 3D printing feeding and extruding device and 3D printing equipment | |
| CN212399993U (en) | SMC sheet molding compound on-line mixing and feeding system | |
| CN108312355B (en) | Auxiliary system for brick and tile production line and application method thereof | |
| CN203523793U (en) | One-key automatic calibration device of mixed pipe tobacco perfuming flow meter | |
| CN207059049U (en) | A kind of polyurethane polyol automatic gauge mixing arrangement | |
| CN210368525U (en) | Pitch metering supply system | |
| CN113510856A (en) | Mobile micro mortar station batching method and system thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |