CN114985676A - 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
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- CN114985676A CN114985676A CN202210601736.9A CN202210601736A CN114985676A CN 114985676 A CN114985676 A CN 114985676A CN 202210601736 A CN202210601736 A CN 202210601736A CN 114985676 A CN114985676 A CN 114985676A
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Abstract
The invention relates to the technical field of sand mixer correction, and discloses a system and a method for monitoring the molding sand weight 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 a connecting pipeline, and the liquid material pump is electrically connected with a frequency converter; the bottom of the sand silo 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 rate of the liquid material, 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 material flow signal and controls the frequency of the frequency converter so as to adjust the liquid material pump. This scheme makes molding sand and liquid material reach best ratio in the sand mould through the correction, effectively promotes sand mould intensity and homogeneity, can also avoid the waste of molding sand and liquid material simultaneously, practices thrift figurative time cost and material cost, is showing promotion production efficiency.
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 molding sand weight and correcting liquid materials of a continuous sand mixer.
Background
With continuous iteration and upgrading of the technology level, the production equipment gradually tends to be developed in the directions of light weight, complexity and high reinforcement. The sand casting has air permeability, effectively reduces the resistance of a melt in a mold filling process, avoids casting defects such as insufficient casting, air holes, cold shut and the like, and is an important casting method for preparing high-performance complex components. In the sand casting process, the preparation of the sand mold is vital, and the sand mold is usually prepared by adopting a continuous sand mixer at present, however, the actual addition proportion of the liquid material and the molding sand is inconsistent with the theoretical addition proportion of the liquid material and the molding sand due to factors such as climate, ambient temperature, liquid material quality and molding sand quality of the conventional continuous sand mixer. And the mismatch of the addition amount of the liquid material and the weight of the molding sand can cause too high or too low compactness of the molding sand and larger difference of strength properties 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, even easy collapse and scattering of the sand mold and the like are caused, and the quality of the sand mold and the casting production are seriously influenced. Therefore, the method for improving the accurate proportion of the weight of the molding sand to the addition of the liquid material in the molding process is an important method for ensuring the quality of the sand mold. However, the prior art for solving the technical problem of inconsistent hardness at different positions of the sand mold conventionally adopts a mode of mixing uniformly in advance, which prolongs the molding time, and the too long mixing time easily causes the solidification of the mixture and the reduction of the fluidity, thereby reducing the molding plasticity and the molding quality and seriously reducing the production efficiency. At present, no research on a system and a method for correcting the addition amount of the molding sand and the liquid material exists. Therefore, the system and the method for realizing the molding sand weight monitoring and liquid material correction of the continuous sand mixer can make up for the defects of the function of the continuous sand mixer in the market, and have important significance for preparing high-quality sand molds and castings.
Disclosure of Invention
The invention aims to provide a system and a method for monitoring the molding sand weight and correcting liquid materials of a continuous sand mixer, so as to solve the technical problem that the strength of different positions of a sand mold is inconsistent in the continuous sand mixing process due to the difference between the actual adding proportion of the molding sand and the liquid materials and a theoretical value in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a continuous sand mixer molding sand weight monitoring and liquid material correcting 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 used for adjusting the amount of liquid materials entering the sand mixer; the flowmeter is used for detecting a liquid material flow signal; the liquid pump is electrically connected with a frequency converter;
the bottom of the sand bin is provided with a control valve, the control valve is used for adjusting the amount 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, generating a weight signal and then sending the weight signal to the controller;
the flowmeter is used for detecting the flow rate of liquid materials in the liquid outlet device, generating a flow signal and then sending the flow signal to the controller;
and the controller calculates the theoretical addition amount of the liquid material according to the weight signal, compares the theoretical addition amount with the liquid material flow signal and controls the frequency of the frequency converter so as to adjust the liquid material pump.
The principle of the scheme is as follows:
this scheme passes through the molding sand weight signal that weighing sensor real-time supervision got into in the roller mill to give the controller with molding sand weight signal transmission, the controller calculates the theoretical liquid material volume that needs according to the quality ratio of received molding sand weight signal and molding sand liquid material afterwards, compares the actual liquid material volume that theoretical liquid material volume and flowmeter detected afterwards, and according to the frequency of concrete contrast result control converter, with the transport flow of regulation liquid material pump, thereby realize the correction of liquid material addition.
The scheme has the advantages that:
1. carry out the feeding with current roller mill according to theoretical input value and compare, this scheme is through carrying out real time monitoring to the molding sand volume that gets into to the liquid material volume that gets into the roller mill is rectified according to the molding sand volume that changes in real time, thereby makes the molding sand volume and the liquid material volume that get into the roller mill infinitely approach to theoretical ratio, thereby realizes molding sand liquid material ratio homogeneity, promotes the uniformity of the sand mould that prepares, thereby promotes the sand mould quality. The applicant experiments prove that the quality of the sand mold corrected by the scheme is more uniform, the strength deviation of different positions of the sand mold is +/-0.2 MPa, and is obviously lower than the uncorrected strength deviation of the sand mold +/-0.64 MPa, so that the quality of the sand mold is improved.
2. Compare with current roller mill feeding uncorrected, this scheme is through proofreaying and correct the liquid material addition to show the accuracy that promotes molding sand and liquid material addition, avoid appearing because of not proofreaying and appearing molding sand after mixing and liquid material very far apart with theoretical ratio as prior art in, thereby it collapses and the phenomenon of molding failure to lead to sand mould intensity not enough to appear even in the molding process. In addition, the scheme enables the molding sand and the liquid material in the sand mold to reach the optimal ratio through correction, effectively improves the strength and the uniformity of the sand mold, can avoid the waste of the molding sand and the liquid material, saves the time cost and the material cost of molding, and obviously improves the production efficiency.
3. Compare and use different types of molding sand preparation sand mould in current roller mill, the molding sand of this scheme adoption quality homogeneous constitutes the mixture with the liquid material and is used for the molding with the mixture, and gained sand mould quality homogeneous is fast just modelled, is showing to have promoted sand mould production efficiency.
Preferably, the sand mixer comprises a large arm and a small arm which are connected in a rotating mode, 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 the controller; the weight sensor is positioned below the conveying belt, and the feeding end of the conveying belt is positioned right below the outlet of the control valve. Adopt above-mentioned scheme, be convenient for realize the reinforced of molding sand and to the real time monitoring of molding sand addition to carry out real-time correction to the liquid material addition 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 adding holes, the liquid box is connected with the liquid adding holes in a one-to-one pipeline mode, and each connecting pipeline is provided with a liquid pump and a flowmeter. By adopting the scheme, the feeding of various liquid materials is facilitated, 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 vaporific diffusion, so that the liquid material and the molding sand are conveniently and fully mixed, and the uniformity of the mixed material 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, generating a temperature signal and then transmitting the temperature signal to the controller; the controller calculates the theoretical addition of the liquid according to the temperature signal and the weight signal and controls the frequency of the frequency converter to adjust the liquid pump. In long-term production, the applicant finds that the weight and the temperature of the molding sand and the addition amount of the liquid material jointly influence the quality of the sand mold, 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 a high-quality sand mold. By adopting the scheme, various factors influencing the quality of the sand mold can be conveniently and comprehensively considered, so that the quality and the uniformity of the sand mold are improved.
Preferably, 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 displaying faults. By adopting the scheme, the modeling process and possible faults thereof can be monitored by operators conveniently.
A method for monitoring the molding sand weight and correcting liquid materials of a continuous sand mixer comprises the following steps:
s1: starting, wherein the controller controls the continuous sand mixer, the control valve and the liquid material pump to start;
s2: 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 rate of the liquid material, generates a flow signal and then sends the flow signal to the controller;
s3: correcting, namely calculating and comparing the received signals by the controller, and controlling the frequency of the frequency converter according to a comparison result to correct the flow of the liquid pump so as to realize the correction of the addition amount of the liquid;
s4: and (4) molding, namely mixing the molding sand and the liquid material entering the small arm by using the screw propeller of the small arm, and using the mixed material for filling sand and molding.
The principle and the advantages of the scheme are as follows:
1. compare with prior art uncorrected direct addition raw materials, this scheme is through proofreaying and correct the raw materials addition for the interpolation proportion of raw materials is infinitely close to theoretical interpolation proportion, thereby realizes the accurate control that the raw materials added, thereby guarantees the homogeneity of molding quality, promotes production efficiency.
2. Compared with the prior art that a mixing program is set independently, the small arm completes the mixing of the molding sand and the liquid material while being propelled by the screw, so that the mixing time is saved, and the molding efficiency is improved; simultaneously, the mode that this scheme spiral propulsion mixes effectively avoids appearing leading to the fact the phenomenon that molding quality is poor because of the mixture plasticity after mixing alone among the prior art reduces, has promoted molding quality.
Preferably, in S1, the method further includes inputting the addition ratios of the molding sand and the liquid material required by different sand molds into the controller for encoding before starting the sand mixer, and selecting the corresponding addition ratios of the molding sand and the liquid material according to the sand molds when starting the continuous sand mixer. By adopting the scheme, the molding sand and liquid material adding proportion required by different sand molds can be conveniently molded, the input and operation time during molding can be saved by encoding in advance, and meanwhile, the operation steps can be conveniently saved by defining the encoding form in advance, so that the equipment is suitable for any operator, and the application range of the equipment is enlarged.
Preferably, the liquid material comprises a curing agent and resin, 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 method further includes an alarm program and a compensation and correction program, the alarm program is used to control the liquid pump to start the compensation and correction program when the adjustment of the liquid addition amount fails, and the compensation and correction program includes a controller to calculate the theoretical addition amount of the molding sand according to the flow rate signal fed back by the flowmeter and to control the opening of the control valve.
In the actual production process, the liquid material correction procedure cannot meet the condition that the actual adding proportion of the molding sand and the liquid material is consistent with the theoretical adding proportion because of equipment aging or reduced tightness and the like. By adopting the scheme, the bidirectional correction of raw material addition can be realized, the continuous sand mixer can continuously correct the raw material addition amount conveniently, the continuous production is realized, and the production efficiency and the service life of equipment are improved. Especially when liquid material correction fails, this scheme still can be through the compensation correction procedure, proofreaies and correct the addition of molding sand to avoid the waste of molding sand.
Drawings
Fig. 1 is a schematic structural diagram of the entire system in embodiment 1 of the present invention.
Fig. 2 is a schematic flow chart of a correction method in embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of the positions of the sand mold and the sampling points in example 1 of the present invention.
Fig. 4 is a schematic diagram of a calibration flow of the compensation calibration procedure in embodiment 10 of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the sand box comprises a sand silo 1, a control valve 11, a liquid material box 2, a liquid material pump 21, a flow meter 22, a sand mixer 3, a large arm 31, a weight sensor 311, a temperature sensor 312, a first motor 313, a small arm 32, a liquid material adding hole 321, a second motor 322 and a sand box 4.
Example 1
This embodiment is substantially as shown in fig. 1: a continuous sand mixer molding sand weight monitoring and liquid material correcting system comprises a sand mixer 3, a sand bin 1, a liquid material box 2 and a controller;
the bottom of the sand silo 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 amount 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 connected in a rotating mode, the large arm 31 is communicated with the small arm 32, a conveying belt is arranged in the large arm 31 in a stretching mode, the feeding end of the conveying belt is located right below the outlet of the control valve 11, and the outlet end of the conveying belt is located right above the small arm 32; a driving roller and a driven roller are respectively fixed in 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 is specifically a first motor 313; a weight sensor 311 is arranged below the conveying belt, the weight sensor 311 is electrically connected with the controller, the weight sensor 311 is used for detecting the weight of the molding sand entering the conveying belt, generating a weight signal and then sending the weight signal to the controller, and the weight sensor 311 is fixed on the fixing 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.
A spiral propeller is arranged in the small arm 32, 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 further provided with a plurality of liquid material adding holes 321, specifically three liquid material adding holes 321 in this embodiment, and the three liquid material adding holes 321 are equidistantly arranged in the axial direction of the small arm 32; each liquid material adding hole 321 is in one-to-one pipeline connection with each liquid material tank 2 of each liquid material, each connecting pipeline is provided with a liquid material pump 21 and a flow meter 22, each liquid material pump 21 is electrically connected with one frequency converter, and all the frequency converters and the flow meters 22 are electrically connected with the controller; the flowmeter 22 is used for detecting a flow signal of the liquid material in the liquid outlet device and sending the flow signal to the controller; the controller calculates the theoretical addition amount of the liquid material according to the received weight signal and the 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.
Install atomizer in every liquid material adds hole 321, this embodiment specifically is the nozzle, and the liquid material of being convenient for is vaporific diffusion and gets into forearm 32 to mix with the molding sand in forearm 32, vaporific liquid material is convenient for the intensive mixing of liquid material and molding sand, thereby promotes the homogeneity of mixture. The sand box 4 is placed under the discharge end of the small arm 32, so that the mixture conveyed in the small arm 32 can be conveniently molded.
The controller is also electrically connected with a display screen, the controller is specifically a PLC controller (not shown in the figure) in this embodiment, and the display screen is used for displaying the addition amount and the fault display of the sand mold and the liquid material (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 actual needs).
The scheme also provides a method for monitoring the weight of the 3-type sand of the continuous sand mixer and correcting the liquid material, which is finished by relying on the 3-type sand weight monitoring and correcting system of the continuous sand mixer, adopts a flow chart shown in figure 2 and comprises the following steps:
s1: inputting the information, namely inputting the addition ratio of the molding sand to the liquid material required by different sand molds into a PLC (programmable logic 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 adopted by the embodiment has the contour dimension of 811mm multiplied by 570mm multiplied by 466mm, the liquid material comprises two curing agents and resin, and the mass ratio of the molding sand to the added resin is 1: 1%; the mass ratio of the added curing agent to the added resin is 0.5:1, and the mass ratio of the added curing agent to the added resin is 1: 1; therefore, the mass ratio of the molding sand to the curing agent 1 to the curing agent 2 to the resin is 1: 0.25: 1%.
S2: and starting, controlling the continuous sand mixer 3, the control valve 11 and the liquid material pump 21 to start by the PLC, and selecting the corresponding addition proportion of the molding sand and the liquid material according to the sand mold when the continuous sand mixer 3 is started.
S2: signal detection, the weight sensor 311 detects the weight of the molding sand and generates a weight signal, which is then sent 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 flowmeter 22 detects the flow rate of the liquid material, generates a flow signal and then sends the flow signal to the PLC;
in the long-term production time, the applicant finds that the weight, the temperature and the liquid adding amount of the molding sand have important influence on the molding quality, so that the liquid adding amount calculated by comprehensively considering the weight signal and the temperature signal of the sand mold is easier to mold and obtain a high-quality sand mold.
Wherein, the molding sand weight sensor 311 monitors the weight of the molding sand on the conveyer belt in real time and transmits a molding 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;
when the resin is conveyed through the resin flow meter 22, the flow meter 22 detects the actual flow rate thereof and generates a flow rate signal, and then sends the flow rate signal to the PLC controller;
when the curing agent is conveyed through the curing agent flow meter 22, the flow meter 22 detects the actual flow rate thereof and generates a flow signal, and then sends the flow signal to the PLC controller;
s3: correcting, wherein the PLC 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 21 so as to realize the correction of the addition amount of the liquid;
the PLC calculates the theoretical addition amount of the liquid material according to the weight signal of the real-time molding sand and the set addition proportion of the molding sand liquid material, compares the theoretical addition amount with the resin flow signal and the curing agent flow signal to obtain a correction signal of the resin and the curing agent, and the correction signal acts on the frequency converter to change the Hertz number of the frequency converter so as to realize the correction of the addition amount of the resin and the curing agent;
the PLC continuously calculates the weight monitoring of the molding sand and the correction of the liquid material through the weight signal, the temperature signal, the resin flow signal and the curing agent flow signal of the molding sand, so that the real-time addition amount of the liquid material reaches a theoretical set value; the operation formula of the theoretical addition amount of the curing agent and the theoretical addition amount of the resin is as follows:
theoretical resin addition amount: actual molding sand weight is 0.5%: 1 → theoretical resin addition 0.5%. actual sand weight
Theoretical addition amount of curing agent: theoretical resin addition amount of 0.5:1 → theoretical curing agent addition amount of 0.5 ═ theoretical resin addition amount
S4: in the molding, the auger of the arm 32 mixes the molding sand and the liquid material entering the arm 32, and the mixed material is used for sand-pack molding.
The molding sand gets into from forearm 32 entrance point, and liquid material adds the hole 321 entering from the liquid material on the forearm 32 lateral wall, and liquid material forms the spraying by the nozzle and gets into forearm 32 and mix with at forearm 32 internal screw propulsion's molding sand, and the intensive mixing of liquid material and molding sand is convenient for to vaporific liquid material to promote the homogeneity of mixture.
The mixture is filled into the sand box 4 from the discharge end of the small arm 32 to finish sand filling and molding; and taking out the sand mold after the sand mold is hardened.
In order to verify the accuracy and effectiveness of the sand weight monitoring and liquid material correcting method, different parts of a sand mold are sampled by adopting a 9-point method (the sampling points are shown in detail in figure 3), the sand mold strength of 9 sampling points is tested, the strength of 9 samples is compared, the sand mold prepared by adopting the sand weight monitoring and liquid material correcting method is found, the strength of each part is basically consistent, the deviation of the sand mold strength is within +/-0.2 MPa, the consistency of the sand mold strength is obviously improved, and the sand mold quality is improved.
Examples 2 to 9 were molded using the system and method of example 1, with the difference that different ratios of the addition of the molding sand liquid were used; comparative examples 1 to 9 show that the calibration procedure was not started for molding; the ratio of the sand and the liquid material added and the difference in the strength deviation of the sand mold after molding in examples 1 to 9 and comparative examples 1 to 9 are shown in table 1.
TABLE 1 SAND AND LIQUID MATERIAL ADDITION RATIO AND STRENGTH DIFFERENCE OF SAND MOULDS AFTER MOULDING IN EXAMPLES 1 TO 9 AND COMPARATIVE EXAMPLES 1 TO 9
| Examples | Mass ratio of molding sand to liquid material | Mass ratio of resin to curing agent in liquid material | Strength deviation/MPa of sand mold |
| 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 example 7 | 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 shows, this scheme adopts different molding sand liquid material to add the proportion and models, and it all can model successfully in molding sand liquid material interpolation proportion scope. However, the strength deviation of different positions of the sand mold obtained by the molding through the correction procedure (examples 1 to 9) is obviously smaller than that of the sand mold obtained by the molding through the uncorrected procedure (comparative examples 1 to 9), and it is fully proved that the correction system and method used in the scheme can obviously improve the uniformity of the sand mold, thereby improving the quality of the sand mold.
This scheme is through carrying out real time monitoring to the molding sand volume that gets into to the liquid material volume that gets into roller mill 3 is rectified according to the molding sand volume that changes in real time, thereby makes the molding sand volume and the liquid material volume that get into roller mill 3 infinitely approach to theoretical ratio, thereby realizes molding sand liquid material ratio homogeneity, promotes the uniformity of sand mould prepared, thereby promotes the sand mould quality.
Simultaneously, this scheme is through proofreaying and correct the liquid material addition to showing the accuracy nature that promotes molding sand and liquid material addition, avoiding appearing because of not proofreaying and appearing molding sand after mixing and liquid material and theoretical ratio far away mutually among the prior art because of proofreaying and correct the addition, thereby leading to the sand mould intensity not enough and even appear the phenomenon that the molding in-process sand mould collapses and the molding fails. In addition, this scheme makes molding sand and liquid material reach best ratio in the sand mould through the correction, effectively promotes sand mould intensity and homogeneity, can also avoid the waste of molding sand and liquid material simultaneously, practices thrift figurative time cost and material cost, is showing promotion 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, by using the flowchart shown in fig. 4, the controller includes an alarm program and a compensation correction program, the alarm program is used to control the liquid pump 21 to start the compensation correction program when the adjustment of the liquid addition amount fails, and the compensation correction program includes that the controller calculates the theoretical addition amount of the molding sand according to the flow rate signal fed back by the flow meter 22 and controls the opening of the control valve 11; the operation formula of the theoretical addition amount of the molding sand is as follows:
taking the actual addition amount (actual flow rate) of the resin as a calculation reference:
theoretical addition amount of molding sand: actual resin addition amount is 1: 0.5% → the theoretical addition amount of molding sand ═ the actual resin addition amount/0.5%;
theoretical addition amount of curing agent: actual resin addition amount ═ 0.5:1 → theoretical curing agent addition amount ═ 0.5 × actual resin addition amount;
or, taking the actual adding amount (actual flow rate) of the curing agent as a calculation standard:
theoretical resin addition amount: actual addition amount of the curing agent is 1:0.5 → theoretical addition amount of the resin is actual addition amount of the curing agent/0.5;
theoretical addition amount of molding sand: theoretical resin addition amount is 1: 0.5% → the theoretical addition amount of molding sand ═ actual resin addition amount/0.5%; .
In this embodiment, can realize the two-way correction of raw materials interpolation, the continuous roller mill 3 of being convenient for carries out continuous correction to the raw materials addition, realizes continuous production, promotes production efficiency and equipment life. The method comprises the following specific steps: when equipment is ageing and lead to liquid material to rectify and fail, this scheme is through starting alarm program and give the PLC controller with alarm signal transmission, start compensation correction program when the PLC controller receives alarm signal, the PLC controller calculates the theoretical addition of molding sand according to the flow signal that flowmeter 22 fed back this moment, compare the actual addition of molding sand that theoretical molding sand addition and weight sensor 311 detected, and the opening according to comparative result control valve 11 is with correcting the addition of molding sand, thereby avoid the waste of molding sand. Compared with the prior art that the sand mold being molded is interrupted and the production is stopped due to the aging alarm of the equipment, the scheme can realize the continuous production through the compensation correction program; after the sand mold in the process of molding is finished, the equipment is stopped for maintenance, so that the continuous production is more facilitated.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, and these should also be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The utility model provides a monitoring of continuous roller mill molding sand weight and liquid material correction system which 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 amount of liquid materials entering the sand mixer; the flowmeter is used for detecting a liquid material flow signal; the liquid pump is electrically connected with a frequency converter; the bottom of the sand bin is provided with a control valve, the control valve is used for adjusting the amount 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, generating a weight signal and then sending the weight signal to the controller; the flowmeter is used for detecting the flow rate of liquid materials in the liquid outlet device, generating a flow signal and then sending the flow signal to the controller; and the controller calculates the theoretical addition amount of the liquid material according to the weight signal, compares the theoretical addition amount with the liquid material flow signal and controls the frequency of the frequency converter so as to adjust the liquid material pump.
2. The sand weight monitoring and liquid material correcting system for a continuous sand mixer as claimed in claim 1, wherein: the sand mixer comprises a large arm and a small arm which are connected in a rotating mode, 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 positioned below the conveying belt, and the feeding end of the conveying belt is positioned right below the outlet of the control valve.
3. The sand weight monitoring and liquid material correcting system for a continuous sand mixer as claimed in claim 2, wherein: 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 adding holes, the liquid box is connected with the liquid adding holes in a one-to-one pipeline mode, and each connecting pipeline is provided with a liquid pump and a flowmeter.
4. The sand weight monitoring and liquid material correcting system for a continuous sand mixer as claimed in claim 3, wherein: and a spraying device is arranged in the liquid material adding hole.
5. The sand weight monitoring and liquid material correcting system for a continuous sand mixer as claimed in claim 4, wherein: a temperature sensor is also arranged in the big 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 theoretical addition amount of the liquid material together according to the temperature signal and the weight signal and controls the frequency of the frequency converter to adjust the liquid material pump.
6. The sand weight monitoring and liquid material correcting system for a continuous sand mixer as claimed in 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 displaying faults.
7. A method for monitoring the molding sand weight and correcting liquid materials of a continuous sand mixer is characterized by comprising the following steps: the method comprises the following steps:
s1: starting, wherein the controller controls the continuous sand mixer, the control valve and the liquid material pump to start;
s2: 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 rate of the liquid material, generates a flow signal and then sends the flow signal to the controller;
s3: correcting, namely calculating and comparing the signals by the controller according to the received signals, and controlling the frequency of the frequency converter according to a comparison result to correct the flow of the liquid material pump so as to realize the correction of the addition amount of the liquid material;
s4: and (3) molding, namely mixing the molding sand and the liquid material entering the small arm by the screw propeller of the small arm, and using the mixed material for sand filling molding.
8. The continuous sand mixer molding sand weight monitoring and liquid material correcting method according to claim 7, characterized in that: and S1, inputting the addition proportion of the molding sand and the liquid material required by different sand molds into a controller for coding before starting the sand mixer, and selecting the corresponding addition proportion of the molding sand and the liquid material according to the sand molds when starting the continuous sand mixer.
9. The continuous sand mixer molding sand weight monitoring and liquid material correcting method according to claim 8, characterized in that: the liquid material comprises a curing agent and resin, 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.
10. The continuous sand mixer molding sand weight monitoring and liquid material correcting method according to claim 9, characterized in that: and in the step S3, the method further comprises an alarm program and a compensation correction program, wherein the alarm program is used for controlling the liquid pump to start the compensation correction program when the adjustment of the addition amount of the liquid fails, and the compensation correction program comprises a controller for calculating the theoretical addition amount of the molding sand according to the flow signal fed back by the flowmeter and controlling the opening of the control valve.
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 |
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| 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 |
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| CN202311035214.8A Division CN117139555A (en) | 2022-05-30 | 2022-05-30 | Molding method of sand mold |
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| CN114985676B CN114985676B (en) | 2023-08-08 |
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| CN202311035214.8A Pending CN117139555A (en) | 2022-05-30 | 2022-05-30 | Molding method of sand mold |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN118080776A (en) * | 2024-04-17 | 2024-05-28 | 潍坊晟林铸造机械有限公司 | Double auxiliary material adding type metering rechecking sand mixer |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN114985676B (en) | 2023-08-08 |
| CN117139555A (en) | 2023-12-01 |
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