Automatic monitoring instrument for sand mixing process

Abstract

The invention discloses an automatic monitoring instrument for a sand mixing process. The automatic monitoring instrument comprises a single-chip microcomputer, and the single-chip microcomputer is electrically connected with a premixing box and a sand mixer; a transfer pipeline is arranged between the premixing box and the sand mixer; the premixing box is communicated with a binder tank, an additive tank and a water tank; transmission pipelines are arranged among the binder tank, the additive tank, the water tank and the premixing box; flow control structures and valves are arranged on the binder tank, the additive tank and the water tank; a hammering type sampling machine, a compaction rate detection module and a molding sand strength test module are arranged on the outer side of the sand mixer; the compaction rate detection module comprises a support, a sample cylinder is arranged on the support, an electric push rod is arranged on the support, the output end of the electric push rod extends into the sample cylinder and is provided with a force application plate, and a tension and compression sensor and a displacement sensor are arranged on the force application plate. According to the method, the effect of adjusting the amount of each component is achieved by monitoring the compaction rate and the wet compression strength of the molding sand, the instability of a molding sand finished product caused by experience adjustment is overcome, and meanwhile, the non-timeliness of manual adjustment is also avoided.

Description

Technical Field

[0001] The invention relates to the technical field of casting technology, in particular to an automatic monitoring instrument for a sand mixing process. Background Art

[0002] Sand mixing is a key step in the casting process. It directly affects the quality and production efficiency of castings. It involves evenly mixing casting sand, binder, additives, water, etc. to make it into molding sand or core sand with certain properties. Sand mixer is the main equipment to complete this process. The main process of sand mixing includes raw material preparation, dry mixing and wet mixing, molding sand configuration, etc.

[0003] The quality of molding sand depends on the precise control of each process in the sand mixing process. In actual application, due to factors such as ambient temperature, liquid quality, and the amount of additives, the actual addition ratio of each component of the sand mixer is slightly different from the preset value, or due to the influence of various external factors, the expected level is not reached, resulting in the compactness and wet compressive strength of the molding sand being affected, resulting in poor molding effect, poor air permeability, low compactness and easy collapse of the molding sand.

[0004] In the prior art, in order to monitor the occurrence of the above situation, it is necessary to stop the machine from time to time to take samples, make samples to test various indicators, and adjust the addition amount of each component accordingly by analyzing the test results. However, relying on experience and hand feeling to make adjustments will still make the finished product unstable, and manual adjustments are not timely and cannot control variables well. Summary of the invention

[0005] The present invention aims to solve the above-mentioned technical problems that adjusting the addition amount based on experience and hand feeling will make the finished product unstable and manual adjustment is not timely, and provides an automatic monitoring instrument for the sand mixing process.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: an automatic monitoring instrument for sand mixing process, comprising a single chip microcomputer, which is electrically connected with a premixing box and a sand mixer; a transfer pipeline is arranged between the premixing box and the sand mixer; a driving motor is arranged on the premixing box and the sand mixer, and the driving motor extends into the premixing box and the sand mixer respectively, and a shearing component and a mixing component are arranged therein;

[0007] The premixing box is connected with a binder tank, an additive tank, and a water tank; transmission pipelines are arranged between the binder tank, the additive tank, the water tank and the premixing box; and flow control structures and valves are arranged on the binder tank, the additive tank, and the water tank;

[0008] A hammer-type sample making machine, a compaction rate detection module, and a molding sand strength test module are arranged on the outside of the sand mixer; the compaction rate detection module includes a support, a sample tube is arranged on the support, an electric push rod is arranged on the support, the output end of the electric push rod extends into the sample tube and is provided with a force plate, and a tension and compression sensor and a displacement sensor are arranged on the force plate.

[0009] Furthermore, the shearing assembly includes a rotating shaft provided in the premixing box, at the output end of the driving motor extending into the premixing box, and a plurality of shearing blades are provided on the outside of the rotating shaft; the mixing assembly includes a rotating shaft 2 provided in the sand mixer, at the output end of the driving motor extending into the premixing box, and a plurality of stirring rods are provided on the outside of the rotating shaft 2.

[0010] Furthermore, flow monitors are provided in the transmission pipelines of the binder tank and the water tank; and a solid flow meter is provided in the transmission pipeline of the additive tank.

[0011] Furthermore, a temperature sensor is provided inside the sand mixer, and a temperature display is provided outside the sand mixer.

[0012] Furthermore, the single chip microcomputer includes a CPU module, a communication module, a control center, and a data analysis center.

[0013] Furthermore, the tension and compression sensor, displacement sensor, temperature sensor, electric push rod, molding sand strength test module, flow monitoring meter, and solid flow meter are all electrically connected to the single chip microcomputer.

[0014] The advantages of the present invention compared with the prior art are:

[0015] By monitoring the compaction rate and wet compressive strength of the molding sand and comparing them with the preset target values, the amount of each component that needs to be adjusted is calculated, and the preset values ​​of each component are readjusted to control the amount of water and related additives and binders to achieve the effect of automatic adjustment; overcome the instability of the finished molding sand caused by adjustment based on experience, and also avoid the untimely nature of manual adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the premixing box of the present invention.

[0018] Figure 3 It is a flow chart when the present invention is implemented.

[0019] As shown in the figure: 1. Single chip microcomputer, 2. Premixing box, 3. Sand mixer, 4. Driving motor, 5. Rotating shaft, 6. Shear blade, 7. Binder tank, 8. Additive tank, 9. Water tank, 10. Flow monitor, 11. Solid flow meter, 12. Temperature display, 13. Hammer type prototyping machine, 14. Compactness detection module, 15. Sand strength test module, 16. Support, 17. Sample cylinder, 18. Electric push rod, 19. Force plate, 20. Tension and compression sensor, 21. Displacement sensor. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] Embodiment 1, in combination with the attached Figure 1 , 3 A sand mixing process automatic monitoring instrument includes a single chip computer 1, which includes a CPU module, a communication module, a control center, and a data analysis center; the single chip computer 1 is electrically connected to a premixing box 2 and a sand mixer 3; a transfer pipeline is provided between the premixing box 2 and the sand mixer 3; the raw material mixture premixed by the premixing box 2 is relatively uniform and has no agglomeration after entering the sand mixer 3, which is convenient for the sand mixer 3 to further mix and stir, thereby improving the quality of the finished product.

[0022] Combined with Figure 1 , 2 The premixing box 2 and the sand mixer 3 are both provided with a driving motor 4, which extends into the premixing box 2 and the sand mixer 3 respectively and is provided with a shearing assembly and a mixing assembly; the shearing assembly includes a rotating shaft 5 provided in the premixing box 2, which is extended from the output end of the driving motor 4, and a plurality of shearing blades 6 are provided on the outer side of the rotating shaft 5. The shearing assembly can avoid direct bonding and agglomeration when mixing different solid and liquid raw materials, resulting in insufficient and uneven mixing; the mixing assembly includes a rotating shaft 2 provided on the driving motor 4 and extending into the sand mixer 3, and a plurality of stirring rods are provided on the outer side of the rotating shaft 2; in the above structure, the rotating shaft 5 is rotatably connected to the inner lower end of the premixing box 2 and the sand mixer 3.

[0023] Combined with Figure 1 The premixing tank 2 is connected to a binder tank 7, an additive tank 8, and a water tank 9; transmission pipelines are provided between the binder tank 7, the additive tank 8, the water tank 9 and the premixing tank 2, so that a number of raw materials can be transferred to the premixing tank 2; flow control structures and valves are provided on the binder tank 7, the additive tank 8, and the water tank 9, so as to facilitate observation of the flow rate and opening and closing of the transmission pipeline; flow monitoring meters 10 are provided in the transmission pipelines of the binder tank 7 and the water tank 9; a solid flow meter 11 is provided in the transmission pipeline of the additive tank 8.

[0024] Combined with Figure 1A temperature sensor is provided inside the sand mixer 3 and a temperature display 12 is provided outside the sand mixer 3, which can monitor the internal temperature of the sand mixer 3 during operation, so as to facilitate temperature control when necessary in the future.

[0025] Combined with Figure 1 , 3 A hammer-type sample making machine 13, a compaction rate detection module 14, and a molding sand strength test module 15 are arranged on the outside of the sand mixer 3; the compaction rate refers to the percentage of volume change of the wet molding sand mixture under the action of the moving compaction force, which can be achieved by the hammer-type sample making machine 13, and the molding sand strength test module is used to monitor the compressive strength of the molding sand in a wet state.

[0026] The compaction rate detection module 14 includes a support 16, a sample tube 17 is provided on the support 16, an electric push rod 18 is provided on the support 16, the output end of the electric push rod 18 extends into the sample tube 17 and is provided with a force plate 19, and the force plate 19 is provided with a tension and compression sensor 20 and a displacement sensor 21; in the automatic control system, the displacement sensor 21 can provide position feedback, and the tension and compression sensor 20 can provide force feedback. Combining these two sensors, the system can perform precise closed-loop control.

[0027] The tension and compression sensor 20 , the displacement sensor 21 , the temperature sensor, the electric push rod 18 , the molding sand strength test module 15 , the flow monitoring meter 10 , and the solid flow meter 11 are all electrically connected to the single chip computer 1 .

[0028] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. An automatic monitoring device for sand mixing process, characterized in that: The invention comprises a single chip computer (1), the single chip computer (1) is electrically connected to a premixing box (2) and a sand mixer (3); a transfer pipeline is provided between the premixing box (2) and the sand mixer (3); a drive motor (4) is provided on both the premixing box (2) and the sand mixer (3), and the drive motor (4) extends into the premixing box (2) and the sand mixer (3) respectively and is provided with a shearing component and a mixing component; The premixing box (2) is connected to a binder tank (7), an additive tank (8), and a water tank (9); transmission pipelines are provided between the binder tank (7), the additive tank (8), the water tank (9) and the premixing box (2); and flow control structures and valves are provided on the binder tank (7), the additive tank (8), and the water tank (9); The sand mixer (3) is provided with a hammer-type sample making machine (13), a compaction rate detection module (14), and a molding sand strength test module (15) on the outside; the compaction rate detection module (14) comprises a support (16), a sample tube (17) is provided on the support (16), an electric push rod (18) is provided on the support (16), an output end of the electric push rod (18) extends into the sample tube (17) and is provided with a force plate (19), and a tension and compression sensor (20) and a displacement sensor (21) are provided on the force plate (19).

2. The sand mixing process automatic monitoring device according to claim 1 is characterized in that: The shearing assembly comprises a rotating shaft (5) provided in a premixing box (2) and extending from the output end of a driving motor (4), wherein a plurality of shearing blades (6) are provided on the outer side of the rotating shaft (5); the mixing assembly comprises a rotating shaft 2 provided in a sand mixer (3) and extending from the output end of a driving motor (4), wherein a plurality of stirring rods are provided on the outer side of the rotating shaft 2.

3. The sand mixing process automatic monitoring device according to claim 1 is characterized in that: A flow rate monitor (10) is provided in the transmission pipelines of the binder tank (7) and the water tank (9); and a solid flow meter (11) is provided in the transmission pipeline of the additive tank (8).

4. The sand mixing process automatic monitoring device according to claim 1 is characterized in that: The sand mixer (3) is provided with a temperature sensor inside and a temperature display (12) outside.

5. The sand mixing process automatic monitoring device according to claim 1 is characterized in that: The single chip computer (1) comprises a CPU module, a communication module, a control center and a data analysis center.

6. The automatic monitoring device for sand mixing process according to claim 1 is characterized in that: The tension and compression sensor (20), displacement sensor (21), temperature sensor, electric push rod (18), molding sand strength test module (15), flow monitoring meter (10), and solid flow meter (11) are all electrically connected to the single chip computer (1).

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