Sand cleaning machine for sand box

Abstract

The invention provides a sand box sand cleaning machine, and belongs to the technical field of sand mold casting, the sand box sand cleaning machine comprises a moving platform, a sand cleaning assembly and an overturning conveyor, the moving platform comprises a portal frame and a supporting trolley slidably arranged on the top of the portal frame, a hydraulic cylinder is fixedly connected to the supporting trolley, and the lower end of a push rod of the hydraulic cylinder penetrates through the supporting trolley; a push rod is arranged on the portal frame, a buffer seat is fixedly mounted at the end of the push rod, a U-shaped frame is fixedly arranged at the lower end of the buffer seat, a driving mechanism is arranged in the U-shaped frame, and the turnover conveyor is arranged below the portal frame. The sand cleaning assembly comprises a sleeve, an impact rod and a rotating disc, the sleeve is rotationally arranged on a horizontal plate body of the U-shaped frame, the impact rod is arranged on the inner wall of the sleeve and extends to the outer portion of the sleeve, and a plurality of stamping knives are fixedly arranged at the lower end of the impact rod in a spiral shape; the sand box cleaning machine can solve the problems that when an existing sand box cleaning machine is used for cleaning sand in a through hole of a sand box mold base, the sand cleaning efficiency is low, and sand cleaning is not thorough enough.

Description

Technical Field

[0001] This application relates to the technical field of sand casting, and particularly relates to a sand box cleaning machine. Background Art

[0002] In the sand casting process, the sand box is an indispensable and important tool. After the casting process is completed, the castings are taken out of the sand box, and usually the sand box is placed on a flipping conveying device for sand cleaning. However, a large amount of molding sand often remains on the inner wall of the sand box and related structures (especially the through-hole area of the mold base). This molding sand adheres tightly to the sand box, forming a stubborn sand shell. The existence of the residual sand shell will bring many adverse effects to subsequent casting work. During the casting process of the casting, if the sand box is not thoroughly cleaned, the residual molding sand may be mixed into the new sand mold, affecting the uniformity and strength of the sand mold, and then causing defects such as sand holes and air holes in the casting, seriously reducing the quality of the casting, increasing the defective rate, and raising the production cost. After the sand cleaning is completed, the sand box needs to be flipped through the flipping platform of the flipping conveying device so that the sand grains cleaned inside fall out through the through-holes at the bottom of the sand box to complete the complete sand cleaning process of the sand box.

[0003] Referring to the Chinese invention patent document with the publication number CN105855522B, the publication date of October 27, 2017, and the name of sand box cleaning machine, it includes a "冂"-shaped mounting frame. A driving rod and a guiding column are inserted on the cross beam of the mounting frame. The lower ends of the driving rod and the guiding column are both fixed to the first slide rail. A first slider is sleeved on the first slide rail. A turntable is installed on the bottom surface of the first slider. A second slide rail is fixed to the lower end of the turntable. A second slider is sleeved on the second slide rail. A mounting seat is fixed to the bottom of the second slider. The middle part of the bottom surface of the mounting seat extends downward to form a mounting rod. An "L"-shaped sand flushing head with an open bottom is hinged to the lower end of the mounting rod. The corner of the sand flushing head is hinged to the mounting rod. An impact cylinder is also installed on the mounting seat. The piston rod of the impact cylinder is directly above the horizontal arm of the sand flushing head.

[0004] Referring to the above technical solution, by using the impact cylinder to repeatedly impact the horizontal arm of the sand flushing head, the vertical arm of the sand flushing head knocks off the sand shell in the sand box, making the sand shell cleaning more efficient and labor-saving. In the actual use process, the direct impact sand cleaning method using the "L"-shaped sand flushing head has a weak cleaning effect on the molding sand. This is because after the sand box undergoes the casting process, the adhesion between the molding sand and the inner wall of the sand box and related structures is relatively strong. The contact area between the lower end of the sand flushing head and the molding sand is large, resulting in a small pressure during impact. Moreover, in order to avoid rigid interference between the sand flushing head and the inner wall of the through-hole of the sand box mold base, the diameter of the sand flushing head must be smaller than the aperture of the sand box mold base. During the sand cleaning process, a certain amount of molding sand will inevitably remain on the inner wall of the hole, and the sand flushing head cannot directly contact these positions on the inner wall of the hole, resulting in an unsatisfactory sand cleaning effect on the inner wall of the through-hole of the mold base. Summary of the Invention

[0005] In view of this, this application provides a sand box cleaning machine, which aims to solve the problems of low cleaning efficiency and incomplete cleaning when cleaning the inside of the through hole of the sand box mold seat by existing sand box cleaning machines.

[0006] To solve the above-mentioned technical problems, this application provides a sand box cleaning machine, including a mobile platform, a sand cleaning component and a tilting conveyor. The mobile platform includes a gantry frame and a support trolley slidably disposed on the top of the gantry frame. A hydraulic cylinder is fixedly connected to the support trolley. The lower end of the push rod of the hydraulic cylinder passes through the support trolley, and a buffer seat is fixedly installed at the end of the push rod. A U-shaped frame is fixedly disposed at the lower end of the buffer seat. A drive mechanism is disposed inside the U-shaped frame. The tilting conveyor is disposed below the gantry frame.

[0007] The sand-cleaning assembly includes a sleeve, an impact rod, and a turntable. The sleeve is rotatably mounted on a horizontal plate of a U-shaped frame. The impact rod is mounted on the inner wall of the sleeve and extends to the outside of the sleeve. Multiple punches are fixedly mounted on the lower end of the impact rod in a spiral shape. The driving mechanism drives the impact rod to drive the punches to reciprocate and vibrate, so as to impact and clean the through holes of the mold seat. The turntable is fixedly installed at the lower end of the sleeve. The turntable is uniformly provided with L-shaped scrapers that can slide elastically. The driving mechanism drives the L-shaped scrapers to rotate through the sleeve and the turntable to adapt to the cleaning operation of the inner wall of the through hole of the mold seat.

[0008] By adopting the above technical solution, the drive mechanism drives the impact rod to reciprocate along the inner wall of the sleeve. The spirally distributed punches at the lower end of the impact rod move synchronously with the impact rod. During the reciprocating vibration, the punches contact the molding sand in the through hole of the mold seat and generate an impact. Since the punches are spirally distributed at the lower end of the impact rod, it can ensure the uniformity of molding sand cleaning and avoid the problem of insufficient pressure caused by multiple punches contacting the molding sand at the same time. Moreover, the drive mechanism drives the sleeve to rotate, and the sleeve drives the turntable at the lower end to rotate. The L-shaped scraper around the turntable rotates with the turntable. At the same time, the L-shaped scraper can slide according to the distance from the inner wall of the through hole under the action of its own elastic structure. During the rotation, it contacts the molding sand on the inner wall of the through hole, which can thoroughly clean the molding sand remaining on the inner wall of the mold seat through hole, avoid the problem of incomplete cleaning of the inner wall molding sand, and improve the overall cleanliness of the sand box cleaning.

[0009] Optionally, the turntable has accommodating cavities evenly distributed around its interior circumference. A slider is slidably connected to the inner wall of the accommodating cavity. A sleeve is fixedly installed at the end of the slider away from the turntable axis. A T-shaped pin is slidably connected inside the sleeve. The T-shaped pin passes through the corresponding insertion holes evenly distributed around the turntable and extends to the outside. An L-shaped scraper is fixedly connected to the end of the T-shaped pin away from the turntable axis. A spring is provided between the inner wall of the sleeve and the end face of the T-shaped pin. A clearance groove is provided inside the slider. A sliding column is vertically slidably connected to the turntable. The sliding column passes through the clearance groove and extends to the lower part of the turntable. A convex shaft is fixedly connected to the sliding column. An inclined guide groove is provided on the side wall of the clearance groove. The convex shaft is slidably connected to the inner wall of the adjacent guide groove.

[0010] By adopting the above technical solution, when the sliding column slides vertically along the turntable under external force, the cam shaft slides in the guide groove. The cam shaft pushes the slider to slide along the inner wall of the turntable cavity in a direction away from or close to the turntable axis. When the slider moves, it drives the sleeve to move synchronously. The T-shaped pin in the sleeve moves with the sleeve under the thrust of the spring, thereby driving the L-shaped scraper to move. At the same time, when the L-shaped scraper is subjected to the force of the inner wall of the through hole, the T-shaped pin slides in the sleeve. Through the cooperation of the sliding column, cam shaft and guide groove, the radial movement of the L-shaped scraper driven by the slider is realized, which can adapt to the cleaning needs of the inner wall of the through hole of mold seat of different diameters. The setting of the spring can buffer the force between the L-shaped scraper and the inner wall of the through hole, avoid damage to the L-shaped scraper due to rigid contact with the inner wall of the through hole, and ensure that the L-shaped scraper is always in contact with the inner wall of the through hole, thus improving the cleaning effect of the inner wall.

[0011] Optionally, it also includes a dust cover, which is fitted onto the outer circumferential surface of the sleeve, and a connecting ring is provided on the lower surface of the top plate of the dust cover, the lower surface of the connecting ring being fixedly connected to the top end of the sliding column.

[0012] By adopting the above technical solutions, the dust cover can prevent sand particles and dust generated during the sand cleaning process from spreading to the surrounding environment and reduce dust pollution. At the same time, the linkage design between the dust cover and the sliding column makes the movement trigger of the L-shaped scraper more convenient, eliminating the need for an additional drive mechanism to control the extension of the L-shaped scraper, thus simplifying the equipment structure and operation process.

[0013] Optionally, a fixing block is provided on the outer arc surface of the upper end of the sleeve, a first planar bearing is provided on the upper surface of the dust cover, a second spring is provided between the first planar bearing and the fixing block, and the sleeve passes through the middle of the first planar bearing.

[0014] By adopting the above technical solution, the elasticity of spring two can realize the automatic reset of the dust cover without manual operation, thus improving the convenience of equipment use; the setting of plane bearing one reduces the friction between the dust cover and spring two, avoids excessive torsion of spring two, and extends the service life of the equipment.

[0015] Optionally, the sidewall of the punch is provided with uniformly vertical through slots.

[0016] By adopting the above technical solution, the design of the through groove improves the crushing efficiency of the punch on the molding sand, making the molding sand easier to crush into small pieces; at the same time, it increases the contact area between the punch and the molding sand, improves the impact effect of the punch, reduces the number of punch impacts, and reduces the energy consumption of the equipment.

[0017] Optionally, both lower surfaces of the punch are inclined surfaces that slope upwards outwards, and wedge-shaped punch teeth are provided on the inclined surfaces of the punch.

[0018] By adopting the above technical solutions, the inclined surface design facilitates the cutting of the punch into the molding sand, reduces the resistance during the impact of the punch, and reduces the load on the drive mechanism; the wedge-shaped punch teeth enhance the punch's ability to crush the molding sand, especially for stubbornly attached sand shells, which can be quickly cut and crushed; the crushed molding sand slides down the inclined surface, avoiding sand particles from remaining and affecting subsequent impact operations, and ensuring that the punch continues to work efficiently.

[0019] Optionally, the impact rod has a sand suction channel inside, the lower end of which is connected to sand suction holes evenly distributed around the bottom of the impact rod, and the upper end of which is connected to an external negative pressure dust removal device through a flexible conduit.

[0020] By adopting the above technical solution, during the process of crushing molding sand with the punch, the external negative pressure dust removal device is activated to generate negative pressure. The negative pressure is transmitted to the sand suction channel inside the impact rod through the flexible conduit. A negative pressure environment is formed in the sand suction channel, which draws the sand particles that fall around the bottom of the impact rod after being crushed by the punch into the sand suction channel through the sand suction holes. Subsequently, the sand particles are transported along the sand suction channel and the flexible conduit to the negative pressure dust removal device for collection, which prevents the sand particles from accumulating in the mold seat through hole and affecting the crushing operation of the punch. This ensures that the punch is always in contact with fresh molding sand, thereby improving crushing efficiency. At the same time, the collection of sand particles by the negative pressure dust removal device reduces the diffusion of sand particles and dust in the working environment, improves the quality of the working environment, and reduces the impact of dust on the health of operators.

[0021] Optionally, the drive mechanism includes a motor, a connecting rod, and a piston cylinder. The motor is fixedly mounted on a U-shaped frame, and a connecting disc is fixedly connected to the output shaft of the motor. A pin is fixedly provided on the outer edge of the connecting disc. The upper end of the connecting rod is rotatably connected to the outer circumferential surface of the pin. The piston cylinder is fixedly mounted in the middle of the U-shaped frame, and a piston is slidably connected inside the piston cylinder. The top end of the piston is rotatably connected to the lower end of the connecting rod through a connecting shaft. The top end of the impact rod passes through the bottom plate of the piston cylinder and abuts against the bottom surface of the piston. A support ring is fixedly provided on the outer arc surface of the upper end of the impact rod. A second planar bearing is provided on the upper surface of the sleeve, and a third spring is provided between the second planar bearing and the support ring.

[0022] By adopting the above technical solution, the impact rod is driven to reciprocate through the cooperation of the motor, connecting rod and piston; the spring provides power for the reset of the impact rod, ensuring that the impact rod can reciprocate stably and continuously, thus ensuring the impact effect of the punch on the molding sand.

[0023] Optionally, the drive mechanism further includes a first bevel gear, a second bevel gear, a synchronous pulley, and a synchronous belt. The first bevel gear is fixedly mounted on the outer arc surface of the top end of the sleeve, and the second bevel gear is rotatably mounted on the vertical plate of the U-shaped frame. The first bevel gear and the second bevel gear are meshed together. There are two synchronous pulleys, which are respectively fixedly mounted on the outer arc surface of the motor's output shaft and the outer arc surface of the rotating shaft of the second bevel gear. The two synchronous pulleys are connected by a synchronous belt.

[0024] By adopting the above technical solution, the transmission cooperation of synchronous pulley, synchronous belt and bevel gear ensures the stable transmission of motor output power, so that the bushing can rotate at a uniform speed.

[0025] Optionally, the buffer seat is circumferentially and uniformly fixedly equipped with guide rods, and the guide rods are slidably connected to corresponding sliding holes inside the support trolley.

[0026] By adopting the above technical solution, the guide rod ensures the stability and accuracy of the buffer seat's up-and-down movement.

[0027] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects: 1. The punch is fixed in a spiral shape at the lower end of the impact rod, avoiding multiple punches from contacting the molding sand simultaneously. This reduces the contact area of ​​a single impact, thereby increasing the impact pressure. Furthermore, the punch sidewalls are evenly grooved, which increases the contact area with the molding sand and generates shear force to quickly break up the dense sand shell. In addition, the lower surfaces at both ends of the punch are designed as inclined surfaces with an upward slope on the outside, and wedge-shaped punch teeth are provided on the inclined surfaces. The inclined surfaces facilitate the punch cutting into the molding sand to reduce impact resistance, and the wedge-shaped punch teeth can cut through stubborn sand shells. At the same time, the broken sand particles slide down along the inclined surfaces, avoiding retention and affecting subsequent impacts. This enhances the ability to break up the molding sand in the through holes of the mold seat, reduces the number of punch impacts, and lowers equipment energy consumption.

[0028] 2. The motor output shaft drives the first bevel gear to rotate via a synchronous pulley and synchronous belt. The first bevel gear meshes with the second bevel gear on the sleeve, thereby driving the sleeve, turntable, and circumferential L-shaped scraper to rotate synchronously, achieving circumferential cleaning of the inner wall of the through hole. The turntable has a receiving cavity, slider, and sliding column structure. When the second spring pushes the dust cover down, the dust cover first contacts the mold seat. When the sleeve continues to move down, the dust cover moves upward relative to the sleeve, thereby driving the sliding column to move upward synchronously through the connecting ring. The sliding column moves through the connecting ring, and the convex shaft on the sliding column slides in the slider guide groove, pushing the slider to move radially, thereby adjusting the extension length of the L-shaped scraper to adapt to through holes of different diameters. The first spring between the sleeve and the T-pin can buffer the force between the L-shaped scraper and the inner wall of the through hole, avoiding rigid contact damage, while ensuring that the scraper always fits the inner wall, achieving thorough cleaning of the inner wall of the through hole and improving the overall cleanliness of the sand box.

[0029] 3. A sand suction channel is opened inside the impact rod. The lower end of the sand suction channel is connected to the sand suction holes evenly distributed around the bottom of the impact rod, and the upper end is connected to an external negative pressure dust removal device through a flexible conduit. During the crushing of molding sand by the impact rod, the negative pressure dust removal device is activated to generate negative pressure, which draws the crushed sand particles around the bottom of the impact rod into the sand suction channel through the sand suction holes, and then transports them to the negative pressure device for collection through the flexible conduit. This not only avoids sand accumulation affecting the crushing efficiency of the impact rod, but also guides airflow through negative pressure, reducing the diffusion of sand particles and dust in the working environment, improving the operating environment, and reducing the impact of dust on the health of operators. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of a sand box cleaning machine according to this application; Figure 2 This is a front view structural diagram of the mobile platform, sand-cleaning assembly, and drive mechanism of this application; Figure 3 This is a schematic diagram of the punch in this application; Figure 4 This is a cross-sectional planar structural diagram of the sand-cleaning assembly and drive mechanism of this application; Figure 5 For this application Figure 4 A magnified schematic diagram of the structure of a portion of region A in the middle; Figure 6 For this application Figure 4 A magnified schematic diagram of the local structure of region B in the middle area; Figure 7 This is a cross-sectional view of the turntable in this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Mobile platform; 101. Gantry frame; 102. Support trolley; 2. Tilting conveyor; 3. Sand cleaning assembly; 31. Sleeve; 32. Impact rod; 321. Sand suction channel; 322. Sand suction hole; 33. Turntable; 4. Drive mechanism; 41. Motor; 42. Connecting plate; 43. Connecting rod; 44. Piston cylinder; 45. Piston; 46. Bevel gear one; 47. Bevel gear two; 48. Synchronous pulley; 49. Synchronous belt; 5. Hydraulic cylinder; 6. Buffer seat; 61. Upper seat plate; 62. Lower seat plate; 63. Limiting rod; 64. Spring four; 7. U-shaped frame; 8. Punch; 81. Through groove; 82. Wedge-shaped punch; 9. L-shaped scraper; 10. Receiving cavity; 11. Slider; 12. Sleeve; 13. T-pin; 14. Spring 1; 15. Clearance groove; 16. Sliding column; 161. Convex shaft; 17. Dust cover; 18. Guide groove; 19. Connecting ring; 20. Fixing block; 21. Planar bearing 1; 22. Spring 2; 23. Pin shaft; 24. Spring 3; 25. Support ring; 26. Planar bearing 2; 27. Sand box; 28. Guide rod; 29. ​​Flexible guide tube; 30. Mold base; 301. Through hole. Detailed Implementation

[0032] The following will be described in conjunction with embodiments of this application. Figures 1-7 The technical solutions of the embodiments of this application are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this application are within the scope of protection of this application.

[0033] Reference Figure 1 This embodiment provides a sand box cleaning machine, including a mobile platform 1, a sand cleaning component 3 and a tilting conveyor 2 (the tilting conveyor 2 is a device that can drive the sand box 27 to move linearly and tilt, and its working principle is existing technology, which will not be described in detail here). The mobile platform 1 is used to drive the drive mechanism 4 and the sand cleaning component 3 to move, so that the sand cleaning component 3 can be vertically aligned with the different through holes 301 of the mold base 30.

[0034] Reference Figure 1 and Figure 2The mobile platform 1 includes a gantry frame 101 and a support trolley 102 slidably mounted on top of the gantry frame 101 (the support trolley 102 is equipped with a drive motor that can control the rotation of its rollers). A hydraulic cylinder 5 is fixedly connected to the support trolley 102. The lower end of the push rod of the hydraulic cylinder 5 passes through the support trolley 102, and a buffer seat 6 is fixedly mounted on the end of the push rod. A U-shaped frame 7 is fixedly mounted on the lower end of the buffer seat 6. The buffer seat 6 consists of an upper seat plate 61, a lower seat plate 62, a limiting rod 63, and four springs 64. The upper seat plate 61 is fixedly connected to the bottom end of the push rod of the hydraulic cylinder 5. The limiting rods 63 are evenly distributed circumferentially on the upper surface of the lower seat plate 62. The limiting rods 63 pass through corresponding limiting holes inside the upper seat plate 61, and each has two locking nuts threaded at its top. A four spring 64 is sleeved in the middle of each limiting rod 63. The two ends of the spring 64 abut against the lower surface of the upper seat plate 61 and the upper surface of the lower seat plate 62, respectively. The spring 64, which are evenly distributed in the circumference, can reduce the recoil force on the hydraulic cylinder 5 and play a protective role. The upper seat plate 61 is fixedly connected to the lower end of the push rod of the hydraulic cylinder 5. The U-shaped frame 7 is fixedly connected to the lower surface of the lower seat plate 62. The drive mechanism 4 is set inside the U-shaped frame 7. The sand cleaning component 3 is set at the lower end of the U-shaped frame 7 and is installed in cooperation with the drive mechanism 4. The tilting conveyor 2 is set below the gantry frame 101. The upper surface of the upper seat plate 61 is evenly fixedly installed with guide rods 28 in the circumference. The guide rods 28 are slidably connected to the corresponding sliding holes inside the support trolley 102. The guide rods 28 are used to guide and buffer the buffer seat 6 to prevent the push rod of the hydraulic cylinder 5 from deviating or jamming when moving up and down.

[0035] The sand box 27 is conveyed to the tilting conveyor 2 by an external conveying device. The drive motor of the support trolley 102 is controlled to work. The support trolley 102 slides on the top slide rail of the gantry frame 101. The support trolley 102 drives the hydraulic cylinder 5, buffer seat 6, U-shaped frame 7 and sand cleaning component 3 to move, so that the sand cleaning component 3 is vertically aligned with the through hole 301 on the mold seat 30 of the sand box 27.

[0036] Reference Figure 2 and Figure 4 The sand-cleaning assembly 3 includes a sleeve 31, an impact rod 32, and a turntable 33. The sleeve 31 is rotatably mounted on the horizontal plate of the U-shaped frame 7. The impact rod 32 is slidably mounted on the inner wall of the sleeve 31 and extends to the outside of the sleeve 31. The lower end of the impact rod 32 is helically fixed with multiple punches 8 (see reference). Figure 3The drive mechanism 4 drives the impact rod 32 to drive the punch 8 to reciprocate and vibrate, thereby impacting and cleaning the through hole 301 of the mold base 30. The spiral distribution of the punch 8 means that only part of the punch 8 contacts the molding sand during reciprocating impact, reducing the contact area of ​​the molding sand in a single impact. Under the condition that the output pressure of the drive mechanism 4 remains unchanged, the contact pressure between the punch 8 and the molding sand is significantly increased, making it easier to break the stubborn sand shell that is tightly attached to the inner wall of the through hole 301. At the same time, the spiral distribution of the punch 8 can cover different circumferential positions within the through hole 301. During the reciprocating impact of the punch 8, it can gradually break the molding sand in various areas within the through hole 301, avoiding the incomplete cleaning of molding sand in some areas due to the concentrated distribution of the punch 8. The side wall of the punch 8 is uniformly vertically provided with through grooves 81. The lower surfaces of both ends of the punch 8 are inclined surfaces that slope upwards on the outer side (the side away from the axis of the impact rod 32). Wedge-shaped punch teeth 82 are provided on the inclined surfaces of the punch 8. The drive mechanism 4 includes a motor 41, a connecting rod 43 and a piston cylinder 44 (see reference). Figure 5 The motor 41 is fixedly mounted on the U-shaped frame 7. A connecting plate 42 is fixedly connected to the output shaft of the motor 41. A pin 23 is fixedly installed on the outer edge of the connecting plate 42. The upper end of the connecting rod 43 is rotatably connected to the outer circumferential surface of the pin 23. The piston cylinder 44 is fixedly mounted in the middle of the U-shaped frame 7. A piston 45 is slidably connected inside the piston cylinder 44. The top end of the piston 45 is rotatably connected to the lower end of the connecting rod 43 through the connecting shaft. The top end of the impact rod 32 passes through the bottom plate of the piston cylinder 44 and abuts against the bottom surface of the piston 45. A support ring 25 is fixedly installed on the outer arc surface of the upper end of the impact rod 32. A second plane bearing 26 is installed on the upper surface of the sleeve 31. A third spring 24 is installed between the second plane bearing 26 and the support ring 25. The third spring 24 is sleeved on the outside of the impact rod 32. The second plane bearing 26 can reduce the friction between the third spring 24 and the sleeve 31, ensuring the smoothness of the impact rod 32 when it moves up and down.

[0037] In use, the output shaft of motor 41 drives the connecting plate 42 to rotate. The connecting plate 42 drives the upper end of the connecting rod 43 to rotate back and forth through the pin 23. The lower end of the connecting rod 43 drives the piston 45 to slide back and forth inside the piston cylinder 44 and hit the top of the impact rod 32. When the impact rod 32 moves downward, the spring 34 is compressed. When the piston 45 separates from the top of the impact rod 32, the impact rod 32 returns to its original position under the elastic force of the spring 34. This cycle repeats, causing the impact rod 32 to move back and forth. The impact rod 32 drives the punch 8 to impact downwards back and forth, crushing the molding sand in the through hole 301. Since the side wall of the punch 8 is uniformly vertically grooved with through grooves 81, the contact area with the molding sand can be increased during the impact process, and shearing force can be formed to quickly crush the tightly attached sand shell and improve the crushing efficiency. Moreover, the lower surfaces of both ends of the punch 8 are inclined surfaces with the outer side sloping upwards, and wedge-shaped punch teeth 82 are provided on the inclined surfaces of the punch 8. The wedge-shaped punch 82 helps to enhance the pressure during impact, quickly breaking through the stubborn sand shell. The crushed sand particles flow downward along the slope, preventing sand particles from being stuck in the punch groove formed in the molding sand by the punch 8 and affecting the next crushing operation of the punch 8.

[0038] Reference Figure 4 , Figure 5 and Figure 6 The impact rod 32 has a sand suction channel 321 inside, and the lower end of the sand suction channel 321 is connected to the sand suction holes 322 that are evenly distributed around the bottom of the impact rod 32 (see reference). Figure 3 The upper end of the sand suction channel 321 is connected to an external negative pressure dust removal device through a flexible conduit 29. The flexible conduit 29 can adapt to the up-and-down reciprocating movement of the impact rod 32 to avoid damage.

[0039] During the crushing of molding sand by the punch 8, the external negative pressure dust removal device works, causing the sand particles accumulated at the bottom of the molding sand punch groove (referring to the through groove 81 formed on the molding sand during the reciprocating impact of the punch 8 on the molding sand in the through hole 301 of the mold seat 30, which is adapted to the impact trajectory and shape of the punch 8) to be discharged to the outside through the sand suction hole 322 and the sand suction channel 321. This avoids excessive accumulation of sand particles that may affect the crushing operation of the punch 8. Moreover, the external clean airflow will flow along the punch groove to the sand suction hole 322, forming a directional airflow barrier, which effectively prevents the dust generated by crushing from escaping to the working environment outside the through hole 301. This not only avoids the accumulation of sand particles affecting the crushing efficiency of the punch 8, but also significantly improves the working environment of the operators.

[0040] Reference Figure 4 and Figure 5The drive mechanism 4 also includes a first bevel gear 46, a second bevel gear 47, a synchronous pulley 48, and a synchronous belt 49. The second bevel gear 47 is rotatably mounted on the vertical plate of the U-shaped frame 7. The first bevel gear 46 is fixedly mounted on the outer arc surface of the top end of the sleeve 31. The first bevel gear 46 and the second bevel gear 47 are meshed together. There are two synchronous pulleys 48, which are respectively fixedly mounted on the outer arc surface of the output shaft of the motor 41 and the outer arc surface of the rotating shaft of the second bevel gear 47. The two synchronous pulleys 48 are connected by the synchronous belt 49.

[0041] During the rotation of the output shaft of motor 41, the meshing transmission of synchronous pulley 48 and synchronous belt 49 drives bevel gear 47 to rotate. Bevel gear 47 meshes with bevel gear 46, driving bevel gear 46 and sleeve 31 to rotate (when sleeve 31 rotates, impact rod 32 only reciprocates along the inner wall of sleeve 31 and does not rotate with sleeve 31). Sleeve 31 drives L-shaped scraper 9 to rotate through turntable 33 to clean the molding sand remaining on the inner wall of through hole 301.

[0042] Reference Figure 4 and Figure 6 A turntable 33 is fixedly mounted at the lower end of a sleeve 31. L-shaped scrapers 9, which can slide elastically, are evenly arranged around the circumference of the turntable 33. A drive mechanism 4 drives the L-shaped scrapers 9 to rotate via the sleeve 31 and the turntable 33 to accommodate the cleaning operation of the inner wall of the through hole 301 in the mold base 30. A receiving cavity 10 is evenly opened around the circumference of the turntable 33. A slider 11 is slidably connected to the inner wall of the receiving cavity 10. A sleeve 12 is fixedly mounted at the end of the slider 11 away from the axis of the turntable 33. A T-shaped pin 13 is slidably connected inside the sleeve 12. The rod of the T-shaped pin 13 passes through the evenly corresponding insertion holes around the circumference of the turntable 33 and extends to the outside. The T-shaped pin 13 is away from the axis of the turntable 33. An L-shaped scraper 9 is fixedly connected to the end of the line. The horizontal part of the L-shaped scraper 9 is slidably connected to the lower end of the turntable 33 to ensure the stability of the L-shaped scraper 9 during movement and to prevent tilting. A spring 14 is provided between the side of the sleeve 12 near the axis of the turntable 33 and the T-shaped pin 13. One end of the spring 14 abuts against the side of the sleeve 12 near the axis of the turntable 33, and the other end of the spring 14 abuts against the end face of the T-shaped pin 13. A clearance groove 15 is vertically opened inside the slider 11. A sliding column 16 is vertically slidably connected to the turntable 33. The sliding column 16 passes through the clearance groove 15 and extends to the lower part of the turntable 33. A convex shaft 161 is fixedly connected to the sliding column 16 (see reference). Figure 7The side wall of the clearance groove 15 is provided with a guide groove 18. The end of the guide groove 18 near the axis of the turntable 33 is inclined upward. The convex shaft 161 is slidably connected to the inner wall of the adjacent guide groove 18 (the inclination angle of the guide groove 18 can be designed according to the required extension length of the L-shaped scraper 9 to ensure that the moving distance of the slider 11 meets the diameter requirements of the through hole 301). The outer peripheral surface of the sleeve 31 is fitted with a dust cover 17. The lower surface of the top plate of the dust cover 17 is provided with a connecting ring 19. The lower surface of the connecting ring 19 is fixedly connected to the top of the sliding column 16. The upper outer arc surface of the sleeve 31 is provided with a fixing block 20. The upper surface of the dust cover 17 is provided with a plane bearing 21. A spring 22 is provided between the plane bearing 21 and the fixing block 20. The sleeve 31 passes through the middle of the plane bearing 21.

[0043] After the punch 8 breaks the molding sand inside the through hole 301 of the mold base 30, a small amount of molding sand will remain on the inner wall of the through hole 301. The punch 8 cannot reach this area due to the limitation of its vertical movement trajectory. At this time, the push rod of the hydraulic cylinder 5 continues to push downward until the lower surface of the dust cover 17 abuts against the upper surface of the mold base 30. At this time, the dust cover 17 slides upward relative to the sleeve 31, and the second spring 22 is compressed. The dust cover 17 drives the sliding column 16 to move vertically relative to the slider 11 through the connecting ring 19. During the vertical movement of the sliding column 16 relative to the slider 11, the slider 11 slides in the guide groove 18 through the convex shaft 161, causing the slider 11 to slide away from the axis of the turntable 33. The slider 11 drives the L-shaped scraper 9 to move closer to the axis of the turntable 33 through the first spring 14 and the T-shaped pin 13 in sequence. As the inner wall of the through hole 301 moves, the turntable 33 drives the L-shaped scraper 9 to rotate. The horizontal plate of the L-shaped scraper 9 cleans the molding sand below, and the vertical plate of the L-shaped scraper 9 cleans the molding sand on the inner wall of the through hole 301. Moreover, due to the setting of spring 14, when the sleeve 31 and the through hole 301 of the mold seat 30 are not concentric, when the L-shaped scraper 9 moves towards the inner wall of the through hole 301 and contacts the inner wall, it will compress spring 14 under the thrust of the inner wall of the through hole 301 to avoid rigid interference between the L-shaped scraper 9 and the inner wall of the through hole 301. After the molding sand inside the through hole 301 is cleaned, the push rod of the hydraulic cylinder 5 retracts, driving the sleeve 31 and the impact rod 32 to move upward. At this time, the dust cover 17 is reset under the elastic force of spring 22.

[0044] The implementation principle of a sand box cleaning machine according to an embodiment of this application is as follows: First, the sand box 27 is conveyed to the tilting conveyor 2 via an external conveying device. At this time, the drive motor of the support trolley 102 is started, and the support trolley 102 slides on the slide rail at the top of the gantry frame 101. The support trolley 102 simultaneously drives the hydraulic cylinder 5, the buffer seat 6, the U-shaped frame 7, and the drive mechanism 4 to move synchronously with the sand cleaning component 3 until the sand cleaning component 3 is vertically aligned with the through hole 301 of the mold seat 30 on the sand box 27. During this process, the guide rods 28 are slidably connected to the corresponding sliding holes inside the support trolley 102, providing stable guidance for the movement of the buffer seat 6 and subsequent components.

[0045] When the sand-cleaning component 3 is vertically aligned with the through hole 301, the motor 41 is started. The output shaft of the motor 41 drives the connecting plate 42 to rotate synchronously. The pin 23 moves in a circular motion with the connecting plate 42, and the pin 23 drives the upper end of the connecting rod 43 to rotate cyclically. The lower end of the connecting rod 43 drives the piston 45 to slide up and down inside the piston cylinder 44 through the connecting shaft. When the piston 45 slides down, it hits the top of the impact rod 32, causing the impact rod 32 to move downward. At this time, the spring 34 is compressed. When the piston 45 slides upward and separates from the top of the impact rod 32, the impact rod 32 returns to its original position under the elastic force of the spring 34. This cycle is repeated to achieve the reciprocating up and down movement of the impact rod 32. The punch 8 moves in a reciprocating impact motion synchronously with the impact rod 32 to crush and clean the molding sand in the through hole 301 of the mold seat 30. The crushed sand particles slide down the inclined surface to avoid being stuck in the groove formed by the impact of the punch 8 and affecting subsequent crushing operations.

[0046] While the molding sand is being crushed inside the through holes 301 of the punch 8, the external negative pressure dust removal device is activated. The negative pressure generated by the operation of the negative pressure dust removal device will draw the sand particles accumulated at the bottom of the molding sand punching groove into the sand suction channel 321 through the sand suction hole 322, and then discharge them to the outside through the flexible conduit 29. This not only prevents the excessive accumulation of sand particles from affecting the crushing operation of the punch 8, but also allows external airflow to enter the sand suction hole 322 and the sand suction channel 321, avoiding dust from escaping and polluting the surrounding environment.

[0047] When the output shaft of motor 41 rotates, the synchronous pulley 48 fixedly installed on its outer arc surface drives another synchronous pulley 48 to rotate synchronously through the synchronous belt 49, thereby causing bevel gear 46 to rotate. Bevel gear 47, which meshes with bevel gear 46, rotates accordingly. Bevel gear 46 is fixedly installed on the outer arc surface of the top end of sleeve 31. Therefore, sleeve 31 starts to rotate under the drive of bevel gear 47, preparing for subsequent sand cleaning of the inner wall of through hole 301.

[0048] After the punch 8 completes the crushing of the molding sand inside the through hole 301, a small amount of molding sand will still remain on the inner wall of the through hole 301. At this time, the push rod of the hydraulic cylinder 5 continues to push downward, causing the buffer seat 6, U-shaped frame 7, drive mechanism 4 and sand cleaning assembly 3 to move downward as a whole until the punch 8 enters the through hole 301 of the mold base 30. At the same time, the lower surface of the dust cover 17 abuts against the upper surface of the mold base 30. As the push rod of the hydraulic cylinder 5 continues to push, the dust cover 17 slides upward relative to the sleeve 31. The spring 22 between the plane bearing 21 set on the upper surface of the dust cover 17 and the fixing block 20 fixed on the outer arc surface of the upper end of the sleeve 31 is compressed. The connecting ring 19 moves upward synchronously with the dust cover 17, and the sliding column 16 moves vertically relative to the turntable 33. The sliding column 16 passes through the vertically opened clearance groove 15 inside the slider 11. When the sliding column 16 moves vertically relative to the slider 11, the convex shaft 161 slides in the guide groove 18, which drives the slider 11 to slide away from the axis of the turntable 33. The inner wall of the receiving cavity 10 of the slider 11 slides, the sleeve 12 moves synchronously with the slider 11, the T-pin 13 moves under the drive of the sleeve 12, and the L-shaped scraper 9 moves with the T-pin 13 towards the inner wall of the through hole 301. The horizontal part of the L-shaped scraper 9 is slidably connected to the lower end of the turntable 33 to ensure stability during the movement and avoid tilting. At the same time, the sleeve 31, which has already started to rotate, drives the turntable 33 to rotate synchronously. The turntable 33 then drives the L-shaped scraper 9 to rotate. The horizontal plate of the L-shaped scraper 9 cleans the molding sand corresponding to the bottom of the through hole 301, and the vertical plate of the L-shaped scraper 9 cleans the molding sand remaining on the inner wall of the through hole 301. Since a spring 14 is provided between the side of the sleeve 12 near the axis of the turntable 33 and the T-pin 13, when the sleeve 31 and the through hole 301 of the mold seat 30 are not concentric, the side of the L-shaped scraper 9 near the inner wall of the through hole 301 will compress the spring 14 under the thrust of the inner wall of the through hole 301, so as to avoid interference between the L-shaped scraper 9 and the inner wall of the through hole 301 and ensure that the sand cleaning operation of the inner wall is carried out smoothly.

[0049] After the molding sand inside and on the inner wall of the through hole 301 has been cleaned, the push rod of the hydraulic cylinder 5 is retracted, causing the buffer seat 6, U-shaped frame 7, drive mechanism 4 and sand cleaning assembly 3 to move upward as a whole. The dust cover 17 gradually returns to its original position under its own weight and the elastic force of spring 22. The sliding column 16 moves downward with the dust cover 17, and the convex shaft 161 slides in the opposite direction in the guide groove 18, causing the slider 11 to slide towards the side closer to the axis of the turntable 33. The L-shaped scraper 9 then returns to its original position. Then the tilting conveyor 2 is started, which drives the sand box 27 to rotate 180 degrees, so that the sand particles cleaned out of the sand box 27 are poured out through the through hole 301 of the mold seat 30, thus completing the sand cleaning process of the sand box 27.

[0050] Furthermore, in the description of this application, the terms "installation", "connection", "linking", and "setting" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

Claims

1. A sand box sand cleaning machine, comprising a moving platform (1), a sand cleaning assembly (3) and a turnover conveyor (2), the moving platform (1) comprises a gantry (101) and a support trolley (102) slidingly arranged on the top of the gantry (101), a hydraulic cylinder (5) is fixedly connected to the support trolley (102), the lower end of the push rod of the hydraulic cylinder (5) penetrates the support trolley (102), and the end of the push rod is fixedly installed with a buffer seat (6), the lower end of the buffer seat (6) is fixedly provided with a U-shaped frame (7), the inside of the U-shaped frame (7) is provided with a driving mechanism (4), and the turnover conveyor (2) is arranged below the gantry (101), characterized in that: the sand cleaning assembly (3) comprises a sleeve (31), an impact rod (32) and a rotating disc (33), the sleeve (31) is rotationally arranged on the horizontal plate body of the U-shaped frame (7), the impact rod (32) is arranged on the inner wall of the sleeve (31) and extends to the outside of the sleeve (31), the lower end of the impact rod (32) is fixedly provided with a plurality of impact knives (8) in a spiral shape, and the driving mechanism (4) drives the impact rod (32) to drive the impact knives (8) to reciprocatingly vibrate, so as to impact and clean the through hole (301) of the mold base (30); the rotating disc (33) is fixedly arranged at the lower end of the sleeve (31), and the circumferential direction of the rotating disc (33) is uniformly provided with elastically slidable L-shaped scrapers (9), and the driving mechanism (4) drives the L-shaped scrapers (9) to rotate through the sleeve (31) and the rotating disc (33), so as to adapt to the cleaning operation of the inner wall of the through hole (301) of the mold base (30).

2. A sand box sand cleaner according to claim 1, characterized in that: The inside of the rotating disc (33) is uniformly provided with an accommodating cavity (10) in the circumferential direction, a sliding block (11) is slidably connected to the inner wall of the accommodating cavity (10), one end of the sliding block (11) away from the axis of the rotating disc (33) is fixedly provided with a sleeve (12), a T-shaped pin (13) is slidably connected in the sleeve (12), the T-shaped pin (13) penetrates the insertion holes correspondingly arranged in the circumferential direction of the rotating disc (33) and extends to the outside, the end of the T-shaped pin (13) away from the axis of the rotating disc (33) is fixedly connected with the L-shaped scraper (9), a spring one (14) is arranged between the inner wall of the sleeve (12) and the end face of the T-shaped pin (13), an avoiding slot (15) is arranged in the sliding block (11), a sliding column (16) is vertically and slidably connected to the rotating disc (33), the sliding column (16) penetrates the avoiding slot (15) and extends to the lower part of the rotating disc (33), a convex shaft (161) is fixedly connected to the sliding column (16), and an inclined guide slot (18) is arranged in the side wall of the avoiding slot (15), and the convex shaft (161) is slidably connected with the inner wall of the adjacent guide slot (18).

3. A sand box sand cleaner according to claim 2, characterized in that: Further comprising a dust cover (17), the dust cover (17) is sleeved on the outer circumferential surface of the sleeve (31), the top plate lower surface of the dust cover (17) is provided with a connecting ring (19), and the lower surface of the connecting ring (19) is fixedly connected with the top end of the sliding column (16).

4. A sand box sand cleaner according to claim 3, characterized in that: The upper end outer arc surface of the sleeve pipe (31) is provided with a fixed block (20), the upper surface of the dust cover (17) is provided with a plane bearing one (21), a spring two (22) is arranged between the plane bearing one (21) and the fixed block (20), and the sleeve pipe (31) passes through the middle part of the plane bearing one (21).

5. A sand box sand cleaner according to claim 1, characterized in that: Uniform vertical through grooves (81) are formed in the side walls of the punch (8).

6. A sand box sand cleaner according to claim 1, characterized in that: The lower surfaces of the two ends of the punch (8) are both outwardly inclined inclined surfaces, and wedge-shaped punch teeth (82) are arranged on the inclined surfaces of the punch (8).

7. A sand box sand cleaner according to any one of claims 1-6, characterized in that: The inside of the impact rod (32) is provided with a sand suction channel (321), the lower end of the sand suction channel (321) is connected with the sand suction holes (322) uniformly arranged on the bottom of the impact rod (32) in the circumferential direction, and the upper end of the sand suction channel (321) is connected to an external negative pressure dust removal device through a flexible conduit (29).

8. A sand box sand cleaner according to claim 7, characterized in that: The driving mechanism (4) comprises a motor (41), a connecting rod (43) and a piston cylinder (44), the motor (41) is fixedly installed on the U-shaped frame (7), a connecting disc (42) is fixedly connected to the output shaft of the motor (41), a pin shaft (23) is fixedly arranged on the outer edge of the connecting disc (42), the upper end of the connecting rod (43) is rotatably connected with the outer circumferential surface of the pin shaft (23), the piston cylinder (44) is fixedly installed on the middle part of the U-shaped frame (7), a piston (45) is slidably connected in the piston cylinder (44), the top end of the piston (45) is rotatably connected with the lower end of the connecting rod (43) through a connecting shaft, the top end of the impact rod (32) penetrates through the bottom plate of the piston cylinder (44) and abuts against the bottom surface of the piston (45), a support ring (25) is fixedly arranged on the outer arc surface of the upper end of the impact rod (32), a plane bearing two (26) is arranged on the upper surface of the sleeve pipe (31), and a spring three (24) is arranged between the plane bearing two (26) and the support ring (25).

9. A sand box sand cleaner according to claim 8, characterized in that: The driving mechanism (4) further comprises a bevel gear one (46), a bevel gear two (47), a synchronous wheel (48) and a synchronous belt (49), the bevel gear one (46) is fixedly arranged on the top end outer arc surface of the sleeve pipe (31), the bevel gear two (47) is rotatably arranged on the vertical plate body of the U-shaped frame (7), the bevel gear one (46) and the bevel gear two (47) are meshingly connected, the synchronous wheel (48) has two and is fixedly installed on the outer arc surfaces of the output shaft of the motor (41) and the rotating shaft of the bevel gear two (47) respectively, and the two synchronous wheels (48) are drivingly connected through the synchronous belt (49).

10. A sand box sand cleaner according to claim 1, characterized in that: The buffer seat (6) is fixedly installed with guide rods (28) in the circumferential direction, and the guide rods (28) are slidably connected with the slide holes arranged in the interiors of the support trolleys (102) respectively.

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