A sand pretreatment device for sand casting processing

Abstract

The invention discloses a sand pretreatment device for molding sand casting processing, which relates to the field of casting technology, and comprises a shell, a controller is fixedly installed on the front side wall, and a distribution box is fixedly installed on the right side wall of the shell; a filtering mechanism, the filtering mechanism is arranged on the shell, and the filtering mechanism comprises: a sand inlet hopper, the sand inlet hopper is fixedly installed on the top surface of the shell. In the present invention, a detection mechanism is arranged to enable a gas pump to inject a fixed amount of gas into an air injection bin, and the fluidity of the gas and the air permeability characteristics of the molding sand are utilized to effectively detect the ventilation performance of the molding sand. By arranging the filtering mechanism, three filtrations of the molding sand are realized. This vibration filtering method can effectively remove large particles in the molding sand and improve the uniformity of the molding sand. In the filtering process, the larger particles of the molding sand filtered out in the first two times flow into the collection box through the specific sand outlet and the opening, so that the collection and treatment of unqualified molding sand is realized, which provides convenience for subsequent recycling.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a sand pretreatment device for molding sand casting processing. Background Art

[0002] In the foundry industry, molding sand is an important raw material, and its air permeability directly affects the quality of castings and the stability of the casting process. Therefore, accurate and efficient testing of the air permeability of molding sand has become an important technical requirement.

[0003] The existing molding sand permeability detection technology has many shortcomings and cannot meet the strict requirements of the modern foundry industry for molding sand quality control. First, the traditional molding sand permeability detection method usually adopts the static pressure method or the exhaust method. Although these methods can evaluate the permeability of molding sand to a certain extent, they have the disadvantages of cumbersome testing process, complicated operation, and long testing time. Especially in a large-scale and high-efficiency production environment, these traditional methods obviously cannot meet the needs of rapid and accurate testing of molding sand permeability. Secondly, the existing molding sand permeability detection equipment often has a single function and lacks automation and intelligent control. During the detection process, manual operation is usually required, which not only increases the labor intensity of the staff, but is also easily affected by human factors, resulting in unstable and inaccurate test results. In addition, the existing technology lacks an effective diversion processing mechanism for qualified and unqualified molding sand. During the detection process, the molding sand that does not meet the permeability standard is often directly eliminated or discarded, which not only causes a waste of resources, but also increases production costs.

[0004] Therefore, based on the above search and in combination with the prior art, a pretreatment device for sand used in sand casting processing is proposed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a sand pretreatment device for sand casting processing to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A pretreatment device for sand used in sand casting processing comprises a shell, a controller is fixedly installed on the front side wall, and a distribution box is fixedly installed on the right side wall of the shell; a filtering mechanism, the filtering mechanism is arranged on the shell, and the filtering mechanism comprises: a sand inlet hopper, the sand inlet hopper is fixedly installed on the top surface of the shell, a sand inlet pipe is installed inside the shell through a vibration component, a first filter screen, a second filter screen and a third filter screen are installed inside the sand inlet pipe from top to bottom in sequence, a discharge hopper is fixedly installed on the bottom surface of the sand inlet pipe, a collecting bin is fixedly installed on the bottom surface of the shell below the discharge hopper, a discharge pipe is arranged between the discharge hopper and the collecting bin, a stirring blade is rotatably connected inside the collecting bin, and the filtering mechanism also comprises a collecting component; a detection mechanism, the detection mechanism is arranged inside the shell, and is used to detect the air permeability of the filtered sand.

[0008] Preferably, the vibration assembly comprises: two support blocks, the two support blocks are respectively installed on both sides of the sand inlet pipe, slide grooves are opened on the inner walls on both sides of the shell, a support rod is fixedly installed inside the slide groove, a vibration spring is sleeved on the outer surface of the support rod, the ends of the two support blocks are slidably sleeved on the support rod, and the bottom surface is in contact with the top surface of the vibration spring, an installation box is fixedly installed on the left side wall of the shell, and a vibration motor is fixedly installed inside the installation box.

[0009] Preferably, the collecting assembly comprises: a collecting box, which is fixedly mounted on the right side wall of the sand inlet pipe, an opening is provided on the side wall of the collecting box facing the sand inlet pipe, two sand outlets are provided on the surface of the sand inlet pipe facing the collecting box, a hose is provided on the bottom surface of the collecting box, one end of the hose is connected to the interior of the collecting box, and the other end is connected to the interior of the collecting bin, an electric push rod is fixedly mounted on the right side wall of the collecting box, the output shaft of the electric push rod passes through the side wall of the collecting box and is connected to a sealing block, which can seal the end of the hose connected to the collecting box.

[0010] Preferably, the detection mechanism comprises: a diverter box, which is fixedly mounted on the bottom surface of the shell, a gas injection bin is fixedly mounted on the top surface of the diverter box, a gas pump is fixedly mounted on the top surface of the gas injection bin, an air outlet head is fixedly mounted on the bottom surface of the gas injection bin, a detection box is fixedly mounted on the bottom surface of the shell and located on the right side of the diverter box, a ventilation pipe is arranged between the gas injection bin and the detection box, one end of the ventilation pipe is connected with the air outlet head, and the other end is connected with the interior of the detection box, a movable plate is slidably mounted inside the detection box, a rectangular groove is provided on the bottom surface of the detection box, a limit rod is fixedly mounted inside the rectangular groove, a reset spring is sleeved on the outer surface of the limit rod, a rectangular block is sleeved on the outer surface of the reset spring, the rectangular block slides on the rectangular groove, the top surface of the rectangular block is connected to the bottom surface of the movable plate, a laser rangefinder is fixedly mounted on the side of the inner wall of the detection box facing the movable plate, and the detection mechanism also comprises a diverter component and a conveying component.

[0011] Preferably, the diversion assembly includes: two wedges, both wedges are fixedly installed inside the diversion box and are symmetrically arranged, a fixing seat is fixedly installed between the two wedges, the bottom surface of the gas injection bin is respectively provided with a first sand leakage hole and a second sand leakage hole, the first sand leakage hole and the second sand leakage hole are respectively located above the two wedges, a flow pipe is provided on the right side wall of the diversion box and on the side wall of the front wedge, one end of the flow pipe extends out of the outside of the shell, and the diversion assembly also includes a sealing member.

[0012] Preferably, the sealing member comprises: a sealing strip, wherein the sealing strip is arranged on the top surface of the fixed seat, the top surface of the fixed seat is located on one side of the sealing strip and is rotatably connected to a gear, a toothed belt is fixedly installed on the surface of the sealing strip facing the gear, the toothed belt is meshed with the gear, a driving motor is fixedly installed on the bottom surface of the fixed seat, the output shaft of the driving motor is connected to the bottom surface of the gear, a limiting groove is provided on the top surface of the fixed seat below the sealing strip, a sliding block is slidably connected to the inside of the limiting groove, and the top surface of the sliding block is fixedly connected to the sealing strip.

[0013] Preferably, the conveying assembly includes: a first mortar pump, which is fixedly mounted on the bottom surface of the shell, a first sand suction pipe and a first sand discharge pipe are respectively provided on both sides of the first mortar pump, one end of the first sand suction pipe is connected to the interior of the collecting bin, and the other end is connected to the interior of the first mortar pump, one end of the first sand discharge pipe is connected to the interior of the first mortar pump, and the other end is connected to the interior of the air injection bin, a connecting column is fixedly mounted on the interior of the air injection bin, one side of the connecting column is connected to a sealing plate through a torsion spring, and the conveying assembly also includes a reflux component.

[0014] Preferably, the return component includes: a second mortar pump, a second sand suction pipe and a second sand discharge pipe are respectively arranged on both sides of the second mortar pump, one end of the second sand suction pipe is connected to the interior of the diversion box and is located on the side wall of the wedge on the rear side, and the other end is connected to the interior of the second mortar pump, one end of the second sand discharge pipe is connected to the interior of the second mortar pump, and the other end is connected to the interior of the collection bin.

[0015] Further

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, a detection mechanism is provided to enable a gas pump to inject a fixed amount of gas into the gas injection bin, and the fluidity of the gas and the air permeability characteristics of the molding sand are used to effectively detect the ventilation performance of the molding sand. During the detection process, the movable plate moves under the push of the gas, and the laser rangefinder can accurately measure the displacement of the movable plate, thereby accurately evaluating the air permeability of the molding sand. In addition, the design of the reset spring enables the movable plate to quickly return to the initial position after the detection is completed, which is convenient for the next detection. This detection method is not only efficient and accurate, but also easy to operate, which greatly improves the efficiency of the molding sand quality control. By timely detecting and separating the molding sand that does not meet the air permeability standard, the stability of the casting process and the product quality are guaranteed;

[0018] 2. In the present invention, by setting a filtering mechanism and driving a vibration motor, the sand inlet pipe and the first filter screen, the second filter screen and the third filter screen inside the sand inlet pipe are vibrated, thereby realizing three filtrations of the molding sand. This vibration filtering method can effectively remove large particles in the molding sand and improve the uniformity of the molding sand. At the same time, the combined design of the support block, the slide groove, the support rod and the vibration spring ensures the stability and reliability of the sand inlet pipe during the vibration process and avoids deviation and damage. During the filtering process, the larger particles of molding sand filtered out in the first two times flow into the collection box through the specific sand outlet and opening, thereby realizing the collection and treatment of unqualified molding sand and providing convenience for subsequent recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the left structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure on the right side of the present invention;

[0021] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0022] Figure 4 It is a schematic diagram of the overall structure of the filtering mechanism of the present invention;

[0023] Figure 5 This is a schematic diagram of the explosion structure of the filtering mechanism of the present invention;

[0024] Figure 6 It is a schematic diagram of the overall structure of the detection mechanism of the present invention;

[0025] Figure 7 This is a schematic diagram of the split structure of the flow diversion box and the gas injection bin of the present invention;

[0026] Figure 8 This is a schematic diagram of the internal structure of the gas injection bin of the present invention;

[0027] Fig. 9 This is a schematic diagram of the structure of the gas injection bin of the present invention when viewed from above;

[0028] Fig.10 It is a schematic diagram of the structure of local parts of the detection mechanism of the present invention;

[0029] Fig.11 This is a schematic diagram of the disassembled structure of the sealing member of the present invention;

[0030] Fig.12 For the present invention Figure 3 Enlarged structural diagram at A in the middle.

[0031] In the figure: 1. Shell; 2. Controller; 3. Distribution box; 4. Sand inlet hopper; 5. Sand inlet pipe; 6. First filter screen; 7. Second filter screen; 8. Third filter screen; 9. Discharge hopper; 10. Discharge pipe; 11. Collection bin; 12. Stirring blade; 13. Support block; 14. Slide; 15. Support rod; 16. Vibration spring; 17. Mounting box; 18. Vibration motor; 19. Collection box; 20. Opening; 21. Sand outlet; 22. Hose; 23. Electric push rod; 24. Diverter box; 25. Gas injection bin; 26. Gas outlet; 27. Ventilation pipe; 28. Detection box; 29 , moving plate; 30, rectangular groove; 31, limiting rod; 32, reset spring; 33, rectangular block; 34, laser rangefinder; 35, wedge; 36, fixed seat; 37, sealing strip; 38, gear; 39, toothed belt; 40, driving motor; 41, limiting groove; 42, sliding block; 43, first sand leakage hole; 44, second sand leakage hole; 45, first mortar pump; 46, first sand suction pipe; 47, first sand outlet pipe; 48, connecting column; 49, sealing plate; 50, second mortar pump; 51, second sand suction pipe; 52, second sand outlet pipe; 53, circulation pipe; 54, gas pump. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In a typical implementation of this application, please refer to Figures 1 to 12 As shown, a sand pretreatment device for sand casting processing includes a housing 1, a controller 2 is fixedly installed on the front side wall, and a distribution box 3 is fixedly installed on the right side wall of the housing 1, and the distribution box 3 supplies power to various components on the device;

[0034] The filter mechanism is arranged on the housing 1 and includes:

[0035] A sand inlet hopper 4 is fixedly mounted on the top surface of the housing 1. A sand inlet pipe 5 is mounted inside the housing 1 through a vibration assembly. A first filter screen 6, a second filter screen 7 and a third filter screen 8 are sequentially mounted inside the sand inlet pipe 5 from top to bottom. A discharge hopper 9 is fixedly mounted on the bottom surface of the sand inlet pipe 5. A collecting bin 11 is fixedly mounted on the bottom surface of the housing 1 below the discharge hopper 9. A discharge pipe 10 is arranged between the discharge hopper 9 and the collecting bin 11. A stirring blade 12 is rotatably connected inside the collecting bin 11. The filtering mechanism also includes a collecting assembly.

[0036] The detection mechanism is arranged inside the housing 1 and is used to detect the air permeability of the filtered molding sand.

[0037] As a preferred implementation in this embodiment, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Fig.12 As shown, the vibration assembly includes: two support blocks 13, the two support blocks 13 are respectively installed on both sides of the sand inlet pipe 5, and the inner walls on both sides of the shell 1 are provided with slide grooves 14, and the inside of the slide grooves 14 is fixedly installed with support rods 15, and the outer surface of the support rods 15 is sleeved with vibration springs 16, the ends of the two support blocks 13 are slidably sleeved on the support rods 15, and the bottom surfaces are in contact with the top surfaces of the vibration springs 16, and a mounting box 17 is fixedly installed on the left side wall of the shell 1, and a vibration motor 18 is fixedly installed inside the mounting box 17.

[0038] As a preferred implementation in this embodiment, please refer to Figure 3 to Figure 5 As shown, the collecting assembly includes: a collecting box 19, the collecting box 19 is fixedly mounted on the right side wall of the sand inlet pipe 5, an opening 20 is provided on the side wall of the collecting box 19 facing the sand inlet pipe 5, two sand outlets 21 are provided on the surface of the sand inlet pipe 5 facing the collecting box 19, a hose 22 is provided on the bottom surface of the collecting box 19, one end of the hose 22 is connected to the inside of the collecting box 19, and the other end is connected to the inside of the collecting bin 11, an electric push rod 23 is fixedly mounted on the right side wall of the collecting box 19, the output shaft of the electric push rod 23 passes through the side wall of the collecting box 19, and is connected to a sealing block, which can seal the end of the hose 22 connected to the collecting box 19;

[0039] Through the above-mentioned features, the molding sand can be filtered three times, and the molding sand with larger size in the first two filtrations can be collected. Specifically, the staff starts the vibration motor 18 through the controller 2 to make the vibration motor 18 vibrate. At this time, the molding sand flows into the first filter screen 6 inside the sand inlet pipe 5 through the sand inlet hopper 4, and the support block 13 slides up and down in the slide groove 14 through the vibration generated by the vibration motor 18 and the deformation force of the vibration spring 16, and the support rod 15 limits the support block 13 and the vibration spring 16 to prevent them from deflecting. When the support block 13 vibrates, the sand inlet pipe 5 connected to the support block 13 will also vibrate synchronously. The molding sand on the first filter screen 6 will fall into the second filter screen 7, the third filter screen 8 and the discharge hopper 9 in turn due to the vibration of the sand inlet pipe 5, and then flow into the collection bin 11 through the discharge pipe 10 for storage. In this process, the molding sand that cannot be screened by the first filter screen 6 and the second filter screen 7 will flow into the collection box 19 through the sand outlet 21 and the opening 20 for collection.

[0040] As a preferred implementation in this embodiment, please refer to Figure 3 , Figure 6 , Figure 7 , Figure 8 and Fig.10 As shown, the detection mechanism includes: a shunt box 24, the shunt box 24 is fixedly installed on the bottom surface of the shell 1, a gas injection bin 25 is fixedly installed on the top surface of the shunt box 24, a gas pump 54 is fixedly installed on the top surface of the gas injection bin 25, a gas outlet head 26 is fixedly installed on the bottom surface of the gas injection bin 25, a detection box 28 is fixedly installed on the right side of the shunt box 24 on the bottom surface of the shell 1, a ventilation pipe 27 is arranged between the gas injection bin 25 and the detection box 28, one end of the ventilation pipe 27 is connected to the gas outlet head 26, and the other end is connected to the inside of the detection box 28. A moving plate 29 is slidably installed inside the detection box 28, a rectangular groove 30 is provided on the bottom surface of the detection box 28, a limit rod 31 is fixedly installed inside the rectangular groove 30, a return spring 32 is sleeved on the outer surface of the limit rod 31, a rectangular block 33 is sleeved on the outer surface of the return spring 32, the rectangular block 33 slides on the rectangular groove 30, the top surface of the rectangular block 33 is connected to the bottom surface of the moving plate 29, a laser rangefinder 34 is fixedly installed on the side of the inner wall of the detection box 28 facing the moving plate 29, and the detection mechanism also includes a diversion component and a conveying component;

[0041] Through the above-mentioned features, the air permeability of the mold sand after screening can be detected. Specifically, the mold sand after screening flows into the gas injection bin 25 through the conveying assembly. At this time, the staff uses the gas pump 54 through the controller 2 to work and inject a certain amount of gas into the interior of the gas injection bin 25. The gas will flow into the detection box 28 through the gas outlet head 26 and the ventilation pipe 27, and push the movable plate 29 forward. The laser rangefinder 34 on one side of the movable plate 29 will detect the air permeability of the mold sand inside the gas injection bin 25 according to the moving distance of the movable plate 29. During the movement of the movable plate 29, the rectangular block 33 connected to the movable plate 29 will also move synchronously. The rectangular block 33 will squeeze the reset spring 32 to cause it to deform. When the detection is completed, the movable plate 29 will return to its original position due to the rebound force of the reset spring 32, which is convenient for the next detection.

[0042] As a preferred implementation in this embodiment, please refer to Figure 6 , Figure 7 and Fig.11 As shown, the flow dividing assembly includes: two wedges 35, the two wedges 35 are fixedly installed inside the flow dividing box 24 and are symmetrically arranged, a fixing seat 36 is fixedly installed between the two wedges 35, a first sand leakage hole 43 and a second sand leakage hole 44 are respectively opened on the bottom surface of the gas injection bin 25, the first sand leakage hole 43 and the second sand leakage hole 44 are respectively located above the two wedges 35, a flow pipe 53 is arranged on the right side wall of the flow dividing box 24 and on the side wall of the front side wedge 35, one end of the flow pipe 53 extends out of the outside of the shell 1, and the flow dividing assembly also includes a sealing member, which includes: a sealing strip 37, the sealing strip 37 is arranged on the top surface of the fixing seat 36, the top surface of the fixing seat 36 is located at one side of the sealing strip 37 and is rotatably connected with a gear 38, a toothed belt 39 is fixedly installed on the surface of the sealing strip 37 facing the gear 38, the toothed belt 39 is meshed with the gear 38, a driving motor 40 is fixedly installed on the bottom surface of the fixing seat 36, the output shaft of the driving motor 40 is connected with the bottom surface of the gear 38, the top surface of the fixing seat 36 is located below the sealing strip 37 and is provided with a limiting groove 41, the inside of the limiting groove 41 is slidably connected with a sliding block 42, and the top surface of the sliding block 42 is fixedly connected with the sealing strip 37;

[0043] Through the above-mentioned features, it is possible to divert qualified and unqualified molding sand. Specifically, when the test is qualified, the staff starts the drive motor 40 through the controller 2 to rotate the gear 38 connected to the output shaft of the drive motor 40. When the gear 38 rotates, the toothed belt 39 connected to the inner core of the gear 38 will drive the sealing strip 37 to move, so that the sealing strip 37 moves to one side of the second sand leakage hole 44, so that the sealing strip 37 cancels the seal of the first sand leakage hole 43. At this time, the molding sand inside the gas injection bin 25 will fall onto the front wedge 35 through the first sand leakage hole 43, and then flow to the next process through the circulation pipe 53. If the test is unqualified, the staff will reverse the drive motor 40 through the controller 2 to move the sealing strip 37 to one side of the first sand leakage hole 43, so that the sealing strip 37 cancels the seal of the second sand leakage hole 44, and the unqualified molding sand will flow into the rear wedge 35 through the second sand leakage hole 44, and then return to the collection bin 11 through the reflux member for secondary processing.

[0044] As a preferred implementation in this embodiment, please refer to Figure 6 As shown, the conveying assembly includes: a first mortar pump 45, which is fixedly installed on the bottom surface of the shell 1, and a first sand suction pipe 46 and a first sand outlet pipe 47 are respectively arranged on both sides of the first mortar pump 45, one end of the first sand suction pipe 46 is connected to the interior of the collection bin 11, and the other end is connected to the interior of the first mortar pump 45, one end of the first sand outlet pipe 47 is connected to the interior of the first mortar pump 45, and the other end is connected to the interior of the gas injection bin 25, and a connecting column 48 is fixedly installed inside the gas injection bin 25, One side of the connecting column 48 is connected to a sealing plate 49 via a torsion spring. The conveying assembly further includes a reflux component, which includes: a second mortar pump 50. A second sand suction pipe 51 and a second sand outlet pipe 52 are respectively provided on both sides of the second mortar pump 50. One end of the second sand suction pipe 51 is connected to the interior of the diverter box 24 and is located on the side wall of the wedge 35 at the rear side, and the other end is connected to the interior of the second mortar pump 50. One end of the second sand outlet pipe 52 is connected to the interior of the second mortar pump 50, and the other end is connected to the interior of the collection bin 11.

[0045] Through the above-mentioned features, the screened molding sand can be transported from the collecting bin 11 to the gas injection bin 25 for testing, and the molding sand that fails the test can be returned to the collecting bin 11. Specifically, the staff turns on the first mortar pump 45 through the controller 2 to make the first mortar pump 45 work. When the first mortar pump 45 is working, the molding sand in the collecting bin 11 will flow into the gas injection bin 25 through the first sand suction pipe 46 and the first sand discharge pipe 47. Before the molding sand flows into the gas injection bin 25, the molding sand will first flush open the sealing plate 49 and then fall into the gas injection bin 25. After the molding sand in the gas injection bin 25 reaches a specified amount, the sealing plate 49 will Because the elastic force of the torsion spring is automatically closed, it prevents some air from leaking through the sealing plate 49 during detection, causing inaccurate detection data. When unqualified molding sand needs to be refluxed, the staff turns on the second mortar pump 50 through the controller 2, so that the molding sand flowing into the rear wedge 35 returns from the mold to the collection bin 11 through the second sand suction pipe 51 and the second sand discharge pipe 52. At this time, the laser rangefinder 34 transmits the data of the refluxed molding sand to the electric push rod 23, so that the electric push rod 23 opens the sealing block according to the data of the laser rangefinder 34, so that the molding sand inside the collection box 19 and the refluxed molding sand are mixed through the stirring blade 12, and then the detection is performed again;

[0046] It is worth mentioning that the distance data measured by the detection box 28 can be transmitted to the laser rangefinder 34 through serial communication, so as to realize the start control of the electric push rod. The steps are as follows: Serial communication setting: First, it is necessary to establish a serial communication connection between the laser rangefinder 34 and the electric push rod 23, which usually includes setting the communication protocol such as RS electric push rod 23 controller 2 or RS connecting column 48 sand inlet tube 5, baud rate, data bit, stop bit and check bit and other parameters. Data analysis: After the laser rangefinder 34 measures the distance, it converts the distance data into an electrical signal or a digital signal and sends it to the electric push rod 23 through the serial port. Control logic programming: In the electric push rod 23, the corresponding control logic needs to be written. For example, when the data received from the laser rangefinder 34 meets the preset start condition, such as the distance is less than a certain threshold, the controller 2 sends a start command to the electric push rod 23 to execute the operation: After the electric push rod 23 receives the start command from the controller 2, it starts to act according to the preset program, such as pushing or pulling.

[0047] It is worth mentioning that the controller 2 is mainly composed of a control circuit board, a drive circuit board, a current sensor, a voltage sensor, a temperature sensor, etc. The control circuit board is responsible for signal acquisition, rotary transformer decoding, analog-to-digital conversion and CAN communication functions, and calculates the required duty cycle to generate a sinusoidal PWM pulse width modulation signal. The drive circuit board is mainly responsible for power control and power regulation. Control signal input: The controller 2 receives signals from different sensors and control panels, and the controller 2 judges and performs logical operations on these signals to determine its operating state, and outputs control signals: The controller 2 outputs corresponding voltage, current and frequency signals to the device to be controlled based on the processed signals. Its principles and work processes are existing mature technical means, so they are no longer described in the present invention.

[0048] Working principle:

[0049] When in use, the sand inlet hopper 4 is fixed on the top surface of the housing 1, and a vibration component is installed inside, including two support blocks 13, a slide 14, a support rod 15, a vibration spring 16, a mounting box 17 and a vibration motor 18. The vibration motor 18 generates vibration, which is transmitted to the sand inlet pipe 5 through the support block 13 and the vibration spring 16, so that the molding sand is filtered step by step through the first filter screen 6, the second filter screen 7 and the third filter screen 8, and the discharge hopper 9 transports the filtered molding sand to the collection bin 11 below. At the same time, the stirring blade 12 is used to mix the molding sand to make its properties uniform. The detection mechanism is located inside the housing 1, including components such as the diverter box 24, the gas injection bin 25, the detection box 28 and the laser rangefinder 34. The screened molding sand is sent to the gas injection bin 25 through the conveying assembly, and the gas pump 54 injects a certain amount of gas, which enters the detection box 28 through the gas outlet 26 and the ventilation pipe 27. The movable plate 29 is pushed by the air permeability of the molding sand. The laser rangefinder 34 evaluates the air permeability of the molding sand according to the moving distance of the movable plate 29. The diversion assembly includes a wedge 35, a fixed seat 36, a sealing strip 37, a gear 38, a toothed belt 39, a driving motor 40 and a sliding block 42. According to the air permeability test result, the driving motor 40 controls the gear 38 to rotate, thereby moving the sealing strip 37. Qualified and unqualified molding sand are diverted. Qualified molding sand flows to the next process through the first sand leakage hole 43, and unqualified molding sand flows back to the collection bin 11 through the second sand leakage hole 44 for secondary processing. The conveying component includes a first mortar pump 45, a first sand suction pipe 46, a first sand outlet pipe 47, a second mortar pump 50, a second sand suction pipe 51 and a second sand outlet pipe 52. The first mortar pump 45 conveys the molding sand in the collection bin 11 to the air injection bin 25 for testing, and the second mortar pump 50 is responsible for returning the unqualified molding sand from the diversion box 24 to the collection bin 11.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sand pretreatment device for sand casting, characterized in that: include: A housing (1), a controller (2) being fixedly mounted on the front side wall of the housing (1), and a distribution box (3) being fixedly mounted on the right side wall of the housing (1); A filter mechanism, the filter mechanism is arranged on the housing (1), and the filter mechanism comprises: A sand inlet hopper (4), the sand inlet hopper (4) being fixedly mounted on the top surface of the shell (1); a sand inlet pipe (5) being mounted inside the shell (1) via a vibration assembly; a first filter screen (6), a second filter screen (7) and a third filter screen (8) being mounted inside the sand inlet pipe (5) in order from top to bottom; a discharge hopper (9) being fixedly mounted on the bottom surface of the sand inlet pipe (5); a collecting bin (11) being fixedly mounted on the bottom surface of the shell (1) below the discharge hopper (9); a discharge pipe (10) being arranged between the discharge hopper (9) and the collecting bin (11); a stirring blade (12) being rotatably connected inside the collecting bin (11); and the filtering mechanism further comprising a collecting assembly; A detection mechanism, the detection mechanism is arranged inside the shell (1) and is used to detect the air permeability of the filtered molding sand, the detection mechanism comprising: a diverter box (24), the diverter box (24) is fixedly mounted on the bottom surface inside the shell (1), a gas injection bin (25) is fixedly mounted on the top surface of the diverter box (24), a gas pump (54) is fixedly mounted on the top surface of the gas injection bin (25), a gas outlet head (26) is fixedly mounted on the bottom surface inside the gas injection bin (25), a detection box (28) is fixedly mounted on the bottom surface inside the shell (1) and located on the right side of the diverter box (24), a vent pipe (27) is arranged between the gas injection bin (25) and the detection box (28), one end of the vent pipe (27) is connected to the gas outlet head (26) The first end is connected to the detection box (28), and the other end is connected to the inside of the detection box (28). A movable plate (29) is slidably mounted inside the detection box (28). A rectangular groove (30) is provided on the bottom surface of the detection box (28). A limit rod (31) is fixedly mounted inside the rectangular groove (30). A return spring (32) is sleeved on the outer surface of the limit rod (31). A rectangular block (33) is sleeved on the outer surface of the return spring (32). The rectangular block (33) slides on the rectangular groove (30). The top surface of the rectangular block (33) is connected to the bottom surface of the movable plate (29). A laser rangefinder (34) is fixedly mounted on the side of the inner wall of the detection box (28) facing the movable plate (29). The detection mechanism also includes a diversion component and a conveying component. The flow splitter assembly comprises: two wedges (35), the two wedges (35) are fixedly mounted inside the flow splitter box (24) and are symmetrically arranged, a fixing seat (36) is fixedly mounted between the two wedges (35), a first sand leakage hole (43) and a second sand leakage hole (44) are respectively opened on the bottom surface of the gas injection bin (25), the first sand leakage hole (43) and the second sand leakage hole (44) are respectively located above the two wedges (35), a flow pipe (53) is arranged on the right side wall of the flow splitter box (24) and on the side wall of the front wedge (35), one end of the flow pipe (53) extends out of the shell (1), and the flow splitter assembly further comprises a sealing member; The conveying assembly comprises: a first mortar pump (45), the first mortar pump (45) being fixedly mounted on the bottom surface inside the housing (1), a first sand suction pipe (46) and a first sand discharge pipe (47) being respectively arranged on both sides of the first mortar pump (45), one end of the first sand suction pipe (46) being in communication with the interior of the collecting bin (11), and the other end being in communication with the interior of the first mortar pump (45), one end of the first sand discharge pipe (47) being in communication with the interior of the first mortar pump (45), and the other end being in communication with the interior of the gas injection bin (25), a connecting column (48) being fixedly mounted inside the gas injection bin (25), one side of the connecting column (48) being connected to a sealing plate (49) via a torsion spring, and the conveying assembly further comprises a reflux member.

2. A sand pretreatment device for sand casting according to claim 1, characterized in that: The vibration assembly includes: Two support blocks (13) are respectively installed on both sides of the sand inlet pipe (5); the inner walls on both sides of the shell (1) are provided with slide grooves (14); a support rod (15) is fixedly installed inside the slide groove (14); a vibration spring (16) is sleeved on the outer surface of the support rod (15); the ends of the two support blocks (13) are slidably sleeved on the support rod (15), and the bottom surfaces are in contact with the top surfaces of the vibration springs (16); a mounting box (17) is fixedly installed on the left side wall of the shell (1); a vibration motor (18) is fixedly installed inside the mounting box (17).

3. The sand pretreatment device for molding sand casting according to claim 1, characterized in that: The collection components include: A collecting box (19) is fixedly mounted on the right side wall of the sand inlet pipe (5); an opening (20) is provided on the side wall of the collecting box (19) facing the sand inlet pipe (5); two sand outlets (21) are provided on the surface of the sand inlet pipe (5) facing the collecting box (19); a hose (22) is provided on the bottom surface of the collecting box (19); one end of the hose (22) is communicated with the interior of the collecting box (19), and the other end is communicated with the interior of the collecting bin (11); an electric push rod (23) is fixedly mounted on the right side wall of the collecting box (19); an output shaft of the electric push rod (23) passes through the side wall of the collecting box (19) and is connected to a sealing block; the sealing block can seal the end of the hose (22) communicating with the collecting box (19).

4. The sand pretreatment device for molding sand casting according to claim 1, characterized in that: Seals include: A sealing strip (37), wherein the sealing strip (37) is arranged on the top surface of a fixed seat (36), the top surface of the fixed seat (36) is located on one side of the sealing strip (37) and is rotatably connected to a gear (38), a toothed belt (39) is fixedly installed on the surface of the sealing strip (37) facing the gear (38), the toothed belt (39) is meshed with the gear (38), a driving motor (40) is fixedly installed on the bottom surface of the fixed seat (36), the output shaft of the driving motor (40) is connected to the bottom surface of the gear (38), and a limiting groove (41) is provided on the top surface of the fixed seat (36) below the sealing strip (37), a sliding block (42) is slidably connected inside the limiting groove (41), and the top surface of the sliding block (42) is fixedly connected to the sealing strip (37).

5. The sand pretreatment device for molding sand casting according to claim 1, characterized in that: The return parts include: A second mortar pump (50), wherein a second sand suction pipe (51) and a second sand discharge pipe (52) are respectively arranged on both sides of the second mortar pump (50), wherein one end of the second sand suction pipe (51) is communicated with the interior of the diversion box (24) and is located on the side wall of the wedge (35) at the rear side, and the other end is communicated with the interior of the second mortar pump (50), and one end of the second sand discharge pipe (52) is communicated with the interior of the second mortar pump (50), and the other end is communicated with the interior of the collection bin (11).

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