Aluminum alloy casting sand core molding machine

Abstract

The present invention relates to the technical field of molding machines, and in particular to a sand core molding machine for aluminum alloy castings, comprising a sand feeding mechanism; further comprising a manipulator mechanism, a mounting frame, a sand feeding pipe, an air pump, an air pump, a tightening machine 1, a sand box, a box cover and a screw rod, four workstations are arranged around the circumference of the manipulator mechanism, a plurality of screw rods are passed through the box cover, and the plurality of screw rods are threadedly connected with the threaded hole seats inside the sand box, a sand feeding pipe and an air pumping pipe are vertically arranged on the mounting frame, the sand feeding machine of the sand feeding mechanism is connected with the sand feeding pipe through a pipeline, the air pump is connected with the air pumping pipe through a pipeline, a plurality of tightening machines 1 are arranged on the mounting frame, and the plurality of tightening machines 1 are used to tighten the plurality of screw rods to press the box cover to the inside of the sand box, the manipulator mechanism clamps the sand box from the workstation 1, passes through the workstation 2 and the workstation 3 in turn, and turns the sand box to the upright position and then places it on the workstation 4; it exhausts air while filling quartz sand, thereby improving the quality of castings, is suitable for lost foam casting, and has good practicality.

Description

Technical Field

[0001] The invention relates to the technical field of molding machines, in particular to a sand core molding machine for aluminum alloy castings. Background Art

[0002] Lost foam casting is a solid casting method that uses dry sand without adhesive and vacuum technology to form a foam plastic mold. It combines foam models with similar size and shape to the casting into a model cluster, brushes refractory paint and dries it, buries it in dry quartz sand for vibration molding, and casts it under negative pressure to gasify the model, so that the liquid metal occupies the position of the model and forms a casting after solidification and cooling.

[0003] The molding machine is a casting equipment used to make sand molds. Its main functions are: filling sand, filling loose molding sand into the sand box; compacting the molding sand, compacting the loose molding sand in the sand box through different methods such as vibration, compaction, vibration pressure, and injection pressure, so that the sand mold has the necessary strength during transportation and casting.

[0004] The Chinese utility model with prior art publication number CN219052853U proposes a turntable four-station molding machine, which includes a frame, a hydraulic device, a pressure plate, an auxiliary sand box, a base, a reduction motor, and a turntable. A reduction motor is installed on the top of the base, and a turntable is installed on the top of the reduction motor. A first station, a second station, a third station and a top box device are installed on the top of the turntable, and a fourth station is installed on the top of the top box device. Through the arrangement of the four stations on the turntable, it can move in a circle. At different stations, the processes of injecting surface sand, adding back sand, compacting surface sand and back sand, and demolding are realized to achieve the optimization of each process. The stations are coordinated and run simultaneously. Although there are four time periods, one period of time is actually occupied, and the molding efficiency is greatly improved.

[0005] However, when the above-mentioned molding machine adds molding sand into the sand box, the sand mold is only compacted by the hydraulic device and the pressure plate, and the air in the sand box is not discharged, which easily leaves air holes in the molding sand core, causing quality defects of the aluminum alloy castings. Moreover, the existing technology is not suitable for lost foam casting, and therefore needs to be improved. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a sand core molding machine for aluminum alloy castings, which can evacuate air while filling quartz sand, thereby improving the quality of castings, is suitable for lost foam casting, and has good practicality.

[0007] The invention discloses a sand core molding machine for aluminum alloy castings, comprising a sand feeding mechanism, wherein the sand feeding mechanism is provided with a sand storage box and a sand feeding machine for conveying quartz sand, wherein the sand feeding machine conveys the quartz sand in the sand storage box to the outside; the invention also comprises a manipulator mechanism, a mounting frame, a sand feeding pipe, an air pump, an air pump pipe, a tightening machine 1, a sand box, a box cover and a screw rod, wherein the manipulator mechanism is installed on the outside of the sand feeding mechanism, and four workstations are arranged around the circumference of the manipulator mechanism, wherein the workstation 1 is used for conveying an inverted sand box, and the workstation 2 is used for supporting an inverted box cover, and a jack matching with the sand feeding pipe and the air pump pipe is arranged on the box cover, and a plurality of screw rods are penetrated on the box cover, and the plurality of screw rods are connected with the threaded holes inside the sand box The seat is threadedly connected, and the mounting frame is located on station three. The sand feeding pipe and the air extraction pipe are vertically installed on the mounting frame. The upper end of the air extraction pipe is higher than the upper end of the sand feeding pipe. The sand feeding machine of the sand feeding mechanism is connected to the sand feeding pipe through a pipeline, and the air extraction port of the air extraction machine is connected to the air extraction pipe through a pipeline. Multiple tightening machines 1 are installed on the mounting frame. The multiple tightening machines 1 are used to tighten multiple screws to press the box cover to the inside of the sand box. Station four is used to transport the sand box. The manipulator mechanism clamps the sand box from station one and then passes through station two and station three in turn, and turns the sand box over to the upright position and then places it on station four; when working, the empty sand box is placed upside down on station one, and the box cover is placed upside down at the same time. The sand box is placed on station two and the lost foam is installed on the inner end surface of the box cover. The manipulator mechanism clamps the sand box on station one and transfers it to the top of the box cover. The manipulator mechanism drives the sand box to descend and snaps it onto the box cover. The multiple screws are rotated so that the multiple screws are screwed with the multiple threaded holes inside the sand box. The manipulator mechanism transfers the sand box to station three. The manipulator mechanism drives the sand box to descend so that the sand feeding pipe and the air extraction pipe respectively pass through the jack of the box cover and extend into the interior of the sand box. The sand feeding machine in the sand feeding mechanism works to transport the quartz sand in the sand storage box to the interior of the sand box through the sand feeding pipe. At the same time, the air extractor is turned on, and the air extractor exhausts the sand box through the air extraction pipe. The air inside is extracted, and at the same time, multiple tightening machines tighten multiple screws respectively, so that the multiple screws push the box cover toward the inside of the sand box, so that the box cover presses the quartz sand inside the sand box to form a sand core, and the robot mechanism transfers the molded sand box to work station four. During the transfer process, the robot mechanism turns the sand box over and places the sand box upright on work station four. Since the air inside the sand box and the box cover is extracted, the formation of pores in the sand core is reduced, which is beneficial to improving the quality of castings and reducing quality defects of aluminum alloy castings. Since the lost foam is pre-installed on the inner end face of the box cover, it is suitable for lost foam casting and has good practicality.

[0008] Preferably, it also includes a filter plate, which is installed at the bottom of the cavity of the sand box, a bottom chamber is arranged between the filter plate and the bottom wall of the sand box, a large number of micropores are arranged on the filter plate, and a through hole matching the exhaust pipe is arranged on the filter plate; when the exhaust pipe is extended into the interior of the sand box through the jack of the box cover, the upper end of the exhaust pipe is extended into the bottom chamber between the filter plate and the bottom wall of the sand box through the through hole of the filter plate, so that the air between the sand box and the box cover is extracted through the large number of micropores of the filter plate, and the exhaust pipe is prevented from being blocked, thereby improving reliability.

[0009] Preferably, it also includes multiple blocking plates, multiple casting holes are arranged on the box cover, and the multiple blocking plates are respectively rotatably installed on the outer end surface of the box cover through a rotating shaft, and the multiple blocking plates respectively close the multiple casting holes; the multiple blocking plates close the multiple casting holes on the box cover to prevent the leakage of quartz sand inside the sand box, and after the multiple blocking plates open the casting holes on the box cover, the casting flow channel of the lost foam is opened, so that large lost foam and multiple lost foams can be cast, and the practicability is good.

[0010] Preferably, it also includes multiple pressure sensors, and pressure sensors are arranged on the side walls of multiple sand feeding pipes; when the box cover squeezes the quartz sand inside the sand box, the multiple pressure sensors detect the pressure of the quartz sand between the sand box and the box cover, and when the pressure reaches the set value, the multiple tightening machines stop tightening the multiple screws, thereby ensuring that the quartz sand is compacted to avoid the lost foam from being crushed, thereby improving the molding quality.

[0011] Preferably, it also includes a sand hopper and a lifting auger. The sand hopper is installed below the mounting frame. The sand hopper is used to receive the quartz sand leaked from the sand box. The input end of the lifting auger extends into the bottom of the sand hopper, and the output end of the lifting auger extends into the sand storage box of the sand feeding mechanism. The sand hopper receives the quartz sand leaked from the sand box, and the lifting auger is operated to lift the quartz sand recovered in the sand hopper into the sand storage box of the sand feeding mechanism for reuse, thereby improving practicality.

[0012] Preferably, it also includes a workbench, a table top, multiple positioning holes and multiple tightening machines II. The workbench is installed on the workstation II, the table top is installed on the top of the workbench, multiple positioning holes are arranged on the table top, the multiple positioning holes are matched with multiple blocking plates respectively, multiple tightening machines II are installed on the table top, and the multiple tightening machines II are matched with multiple screws respectively; the box cover is placed upside down on the table top, the lost foam is installed on the inner end face of the box cover, multiple screws are passed through the multiple box covers, and the multiple blocking plates on the outer end face of the box cover are respectively clamped in the multiple positioning holes, so as to position the box cover, and the multiple tightening machines II respectively rotate the multiple screws, so that the multiple screws are screwed with the threaded hole seats of the sand box, so as to realize the pre-installation of the lost foam, which has good practicality.

[0013] Preferably, the manipulator mechanism includes a column assembly, a beam frame and two gripper assemblies, the middle part of the beam frame is rotatably mounted on the column assembly, and the two gripper assemblies are respectively mounted on the two ends of the beam frame, the gripper assembly includes a cross plate, a motor 1, two groups of arms, two clamps and a double-headed hydraulic cylinder, the middle part of the cross plate is rotatably connected to the end of the beam frame, the motor 1 is mounted on the end of the beam frame, the output shaft of the motor 1 is transmission connected to the cross plate, the inner ends of the two groups of arms are respectively rotatably connected to the two ends of the cross plate, the outer ends of the two groups of arms are both installed with clamps, the two groups of arms are symmetrically arranged, the two clamps are symmetrically arranged, and the two piston rods of the double-headed hydraulic cylinder are respectively rotatably connected to the two groups of arms; the two piston rods of the double-headed hydraulic cylinder contract to pull the two groups of arms inward, so that the inner ends of the two arms respectively drive the two clamps to move inward to clamp the two side walls of the sand box, the beam frame rotates on the column assembly, thereby driving the sand box to transfer between the four workstations, and the motor 1 drives the cross plate to rotate 180 degrees, thereby driving the sand box to flip, the structure is simple, and the clamping is stable and reliable.

[0014] Preferably, each group of arms includes two arms, which are arranged in parallel, and the inner ends of the two arms are rotatably connected to the bracket on the outer side of the cross plate, and the outer ends of the two arms are rotatably connected to the clamping plate, and the bracket, the two arms and the clamping plate form a parallelogram; the parallelogram structure formed by the two arms and the clamping plate ensures that when the piston rod of the double-head hydraulic cylinder pulls the arm to rotate, the clamping plate remains parallel to the side wall of the sand box, thereby improving the stability of clamping the sand box.

[0015] Preferably, the column assembly includes a base plate, a slide, a sleeve, a hydraulic cylinder, a gear ring, a motor three and a gear. The slide is installed above the base plate through a vertical rod. A sliding hole is arranged in the middle of the slide. The sliding sleeve is slidably inserted in the sliding hole of the slide. One end of the hydraulic cylinder is connected to the base plate, and the other end of the hydraulic cylinder is connected to the sliding sleeve. The middle part of the beam frame is rotatably installed on the upper end of the sliding sleeve. The gear ring is concentrically movable on the outer side of the upper end of the sliding sleeve. The gear ring is installed on the lower end surface of the beam frame. The motor three is installed on the sliding sleeve. The output shaft of the motor three is concentrically installed with a gear, and the gear is meshed with the gear ring; the piston rod of the hydraulic cylinder is extended to push the sliding sleeve to rise along the sliding hole of the slide, so that the sliding sleeve pushes the beam frame to rise, and the piston rod of the hydraulic cylinder is contracted to drive the sliding sleeve to descend along the sliding hole of the slide, so that the sliding sleeve drives the beam frame to descend, thereby driving the sand box to rise and fall. The motor three drives the gear to rotate, and the gear meshes with the gear ring to drive the beam frame to rotate around the upper end of the sliding sleeve, thereby transferring the sand box from multiple workstations. The structure is simple and practical.

[0016] Preferably, it also includes a cross bar and a vibration motor, the inner end of the cross bar is elastically mounted on the sand feeding mechanism, and the vibration motor is mounted on the outer end of the cross bar, the vibration motor extends into the third station, and the vibration motor contacts the side wall of the sand box; when the sand box is transferred to the third station, the vibration motor contacts the side wall of the sand box, and the elastic force of the cross bar presses the vibration motor and the sand box tightly. In the process of conveying quartz sand into the sand box through the sand feeding pipe, the vibration motor runs the vibrating sand box, so that the quartz sand is poured more compactly and evenly in the sand box. After the quartz sand is pressed by the box cover, the vibration motor stops, and when the sand box moves to the fourth station, the sand box pushes the cross bar to rotate, and the vibration motor will not block the sand box, which has good practicality.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: since the air inside the sand box and the box cover is extracted, the formation of pores in the sand core is reduced, which is beneficial to improving the quality of castings and reducing quality defects of aluminum alloy castings; since the lost foam is pre-installed on the inner end surface of the box cover, it is suitable for lost foam casting and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a front cross-sectional structural schematic diagram of the present invention;

[0020] Figure 3 It is a structural diagram of the manipulator mechanism;

[0021] Figure 4 It is a schematic diagram of the structure of the cross plate, motor 1, arm, clamping plate and double-head hydraulic cylinder;

[0022] Figure 5 It is a structural diagram of the sand delivery mechanism, mounting frame, sand delivery pipe, air pump, air pump pipe and tightening machine;

[0023] Figure 6 It is a schematic diagram of the structure of the mounting frame, the exhaust pipe and the tightening machine;

[0024] Figure 7 It is a structural diagram of the workbench, table top, positioning holes, tightening machine 2, box cover and screws;

[0025] Figure 8 It is a partial cross-sectional schematic diagram of the structure of the sand box, box cover and screw;

[0026] Fig. 9 It is a front cross-sectional structural diagram of the sand box, box cover, screw and other structures;

[0027] Fig.10 It is a schematic diagram of the exploded structure of the sand box, box cover, screw and other structures.

[0028] Markings in the attached drawings: 1. Sand feeding mechanism; 2. Mounting frame; 3. Sand feeding pipe; 4. Vacuum pump; 5. Vacuum pipe; 6. Tightening machine 1; 7. Sand box; 8. Box cover; 9. Screw; 10. Filter plate; 11. Blocking plate; 12. Pressure sensor; 13. Sand bucket; 14. Lifting auger; 16. Workbench; 17. Table top; 18. Positioning hole; 19. Tightening machine 2; 20. Beam; 21. Cross plate; 22. Motor 1; 23. Arm; 24. Clamp; 25. Double-head hydraulic cylinder; 26. Bottom plate; 27. Slide; 28. Sleeve; 29. ​​Hydraulic cylinder; 30. Gear ring; 31. Motor 3; 32. Gear; 33. Cross bar; 34. Vibration motor. DETAILED DESCRIPTION

[0029] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Example 1

[0030] like Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 , Fig. 9 and Fig.10As shown, a sand core molding machine for aluminum alloy castings includes a sand feeding mechanism 1, wherein the sand feeding mechanism 1 is provided with a sand storage box and a sand feeding machine for conveying quartz sand, wherein the sand feeding machine conveys the quartz sand in the sand storage box to the outside; and further includes a manipulator mechanism, a mounting frame 2, a sand feeding pipe 3, an air pump 4, an air pump 5, a tightening machine 6, a sand box 7, a box cover 8 and a screw 9. The manipulator mechanism is installed on the outside of the sand feeding mechanism 1, and four stations are arranged around the circumference of the manipulator mechanism. Station one is used for conveying an inverted sand box 7, station two is used for supporting an inverted box cover 8, and the box cover 8 is provided with a socket matching the sand feeding pipe 3 and the air extraction pipe 5, and a plurality of screws 9 are passed through the box cover 8, and the plurality of screws 9 are threadedly connected with the threaded hole seats inside the sand box 7. The mounting frame 2 is located on the workstation three, and the sand feeding pipe 3 and the air extraction pipe 5 are vertically installed on the mounting frame 2. The upper end of the air extraction pipe 5 is higher than the upper end of the sand feeding pipe 3. The sand feeding machine of the sand feeding mechanism 1 is connected to the sand feeding pipe 3 through a pipeline, and the air extraction port of the air extraction machine 4 is connected to the air extraction pipe 5 through a pipeline. A plurality of tightening machines 6 are installed on the mounting frame 2, and the plurality of tightening machines 6 are used to tighten the plurality of screws 9 to The box cover 8 is pressed tightly to the inside of the sand box 7. Station four is used to transport the sand box 7. The manipulator mechanism clamps the sand box 7 from station one and passes through stations two and three in turn, flips the sand box 7 to the upright position, and then places it on station four. It also includes a filter plate 10, which is installed at the bottom of the cavity of the sand box 7. A bottom chamber is set between the filter plate 10 and the bottom wall of the sand box 7. A large number of micropores are set on the filter plate 10, and a through hole matching the exhaust pipe 5 is set on the filter plate 10. It also includes multiple pressure sensors 12, and pressure sensors are set on the side walls of multiple sand delivery pipes 3. 12; also includes a sand bucket 13 and a lifting auger 14, the sand bucket 13 is installed below the mounting frame 2, the sand bucket 13 is used to receive the quartz sand leaked from the sand box 7, the input end of the lifting auger 14 extends into the bottom of the sand bucket 13, and the output end of the lifting auger 14 extends into the sand storage box of the sand feeding mechanism 1; also includes a cross bar 33 and a vibration motor 34, the inner end of the cross bar 33 is elastically mounted on the sand feeding mechanism 1, and the vibration motor 34 is installed on the outer end of the cross bar 33, the vibration motor 34 extends into the workstation three, and the vibration motor 34 contacts the side wall of the sand box 7.

[0031] During operation, the empty sand box 7 is placed upside down on the first station, and the box cover 8 is placed upside down on the second station, and the lost mold is installed on the inner end surface of the box cover 8. The manipulator mechanism clamps the sand box 7 on the first station and transfers it to the top of the box cover 8. The manipulator mechanism drives the sand box 7 to descend and snap it onto the box cover 8, and rotates a plurality of screw rods 9 so that the plurality of screw rods 9 are screwed with a plurality of threaded holes inside the sand box 7. The manipulator mechanism transfers the sand box 7 to the third station, and the manipulator mechanism drives the sand box 7 to descend so that the sand feeding pipe 3 and the air extraction pipe 5 respectively pass through the jack of the box cover 8 and extend into the interior of the sand box 7. The air extraction pipe 5 The upper end of the filter plate 10 extends into the bottom chamber between the filter plate 10 and the bottom wall of the sand box 7 through the through hole of the filter plate 10, the vibration motor 34 contacts the side wall of the sand box 7, and the elastic force of the cross bar 33 presses the vibration motor 34 against the sand box 7. The sand conveyor in the sand conveying mechanism 1 works to convey the quartz sand in the sand storage box to the inside of the sand box 7 through the sand conveying pipe 3. At the same time, the air pump 4 is turned on, and the air pump 4 extracts the air between the sand box 7 and the box cover 8 through the air extraction pipe 5 and the large number of micropores of the filter plate 10, and prevents the air extraction pipe 5 from being blocked. At the same time, multiple tightening machines 6 tighten multiple screws 9 respectively, so that multiple screws 9 push the box cover 8 to the inside of the sand box 7. Push, multiple pressure sensors 12 detect the pressure of the quartz sand between the sand box 7 and the box cover 8. When the pressure reaches the set value, multiple tightening machines 6 stop tightening multiple screws 9, so as to avoid the lost mold from being crushed while ensuring that the quartz sand is compacted, so that the box cover 8 compacts the quartz sand inside the sand box 7 to form a sand core. In the process of conveying quartz sand to the sand box 7 through the sand feeding pipe 3, the vibration motor 34 runs the vibrating sand box 7, so that the quartz sand is poured more compactly and evenly in the sand box 7. After the quartz sand is compacted by the box cover 8, the vibration motor 34 stops, and the manipulator mechanism transfers the sand box 7 with the completed molding to the workstation 4, and the sand box 7 pushes the cross bar 33 to rotate, and the vibration motor 34 will not block the sand box 7. During the transfer process, the manipulator mechanism flips the sand box 7 and places the sand box 7 upright on the workstation 4. Since the air inside the sand box 7 and the box cover 8 is extracted, the formation of pores in the sand core is reduced, which is beneficial to improving the quality of castings and reducing quality defects of aluminum alloy castings. Since the lost foam is pre-installed on the inner end surface of the box cover 8, it is suitable for lost foam casting. The sand hopper 13 receives the quartz sand leaked from the sand box 7, and the lifting auger 14 is operated to lift the quartz sand recovered in the sand hopper 13 to the sand storage box of the sand feeding mechanism 1 for reuse. Example 2

[0032] like Figure 1 , Figure 7 and Figure 8As shown, on the basis of Example 1, it also includes a plurality of plugging plates 11, a plurality of casting holes are arranged on the box cover 8, and the plurality of plugging plates 11 are respectively rotatably installed on the outer end surface of the box cover 8 through a rotating shaft, and the plurality of plugging plates 11 respectively close the plurality of casting holes; it also includes a workbench 16, a table top 17, a plurality of positioning holes 18 and a plurality of tightening machines 19, the workbench 16 is installed on the workstation 2, the table top 17 is installed on the top of the workbench 16, a plurality of positioning holes 18 are arranged on the table top 17, the plurality of positioning holes 18 are respectively matched with the plurality of plugging plates 11, a plurality of tightening machines 19 are installed on the table top 17, and the plurality of tightening machines 19 are respectively matched with the plurality of screws 9.

[0033] A plurality of plugging plates 11 seal the plurality of casting holes on the box cover 8 to prevent leakage of quartz sand inside the sand box 7. After the casting holes on the box cover 8 are opened by the plurality of plugging plates 11, the casting flow channel of the lost foam is opened, so that large lost foam and multiple lost foams can be cast, and the practicability is good. The box cover 8 is placed upside down on the table 17, and the lost foam is installed on the inner end surface of the box cover 8. A plurality of screw rods 9 are passed through the plurality of box covers 8, and the plurality of plugging plates 11 on the outer end surface of the box cover 8 are respectively clamped in the plurality of positioning holes 18, so as to position the box cover 8. A plurality of tightening machines 19 respectively rotate the plurality of screw rods 9, so that the plurality of screw rods 9 are screwed with the threaded hole seats of the sand box 7, so as to realize the pre-installation of the lost foam, and the practicability is good. Example 3

[0034] like Figures 1 to 4As shown, on the basis of Example 1, the manipulator mechanism includes a column assembly, a beam 20 and two gripper assemblies, the middle part of the beam 20 is rotatably mounted on the column assembly, and the two gripper assemblies are respectively mounted on the two ends of the beam 20, the gripper assembly includes a cross plate 21, a motor 22, two groups of arm rods 23, two clamps 24 and a double-headed hydraulic cylinder 25, the middle part of the cross plate 21 is rotatably connected to the end of the beam 20, the motor 22 is mounted on the end of the beam 20, the output shaft of the motor 22 is transmission-connected to the cross plate 21, the inner ends of the two groups of arm rods 23 are respectively rotatably connected to the two ends of the cross plate 21, the outer ends of the two groups of arm rods 23 are both installed with clamps 24, the two groups of arm rods 23 are symmetrically arranged, the two clamps 24 are symmetrically arranged, the two piston rods of the double-headed hydraulic cylinder 25 are respectively rotatably connected to the two groups of arm rods 23; each group of arm rods 23 includes two arm rods 23, the two arm rods 23 are arranged in parallel, and the two The inner end of the arm 23 is rotatably connected to the bracket on the outer side of the cross plate 21, and the outer ends of the two arm 23 are rotatably connected to the clamping plate 24. The bracket, the two arm 23 and the clamping plate 24 form a parallelogram; the column assembly includes a base plate 26, a slide 27, a sleeve 28, a hydraulic cylinder 29, a gear ring 30, a motor 31 and a gear 32. The slide 27 is installed above the base plate 26 through a vertical rod. A sliding hole is set in the middle of the slide 27, and the sleeve 28 slides Inserted in the sliding hole of the slide 27, one end of the hydraulic cylinder 29 is connected to the base plate 26, and the other end of the hydraulic cylinder 29 is connected to the sliding sleeve 28. The middle part of the beam frame 20 is rotatably mounted on the upper end of the sliding sleeve 28, and the ring gear 30 is concentrically movably sleeved on the outer side of the upper end of the sliding sleeve 28. The ring gear 30 is installed on the lower end surface of the beam frame 20, and the motor three 31 is installed on the sliding sleeve 28. The output shaft of the motor three 31 is concentrically mounted with a gear 32, and the gear 32 is meshed with the ring gear 30.

[0035] The two piston rods of the double-headed hydraulic cylinder 25 contract to pull the two groups of arm rods 23 inward, so that the inner ends of the two arm rods 23 respectively drive the two clamping plates 24 to move inward to clamp the two side walls of the sand box 7. The parallelogram structure formed by the two arm rods 23 and the clamping plates 24 enables the clamping plates 24 to remain parallel to the side walls of the sand box 7 when the piston rod of the double-headed hydraulic cylinder 25 pulls the arm rods 23 to rotate, thereby improving the stability of clamping the sand box 7. The motor 31 drives the gear 32 to rotate, and the gear 32 engages the gear ring 30 to drive the beam frame 20 to rotate around the upper end of the sliding sleeve 28, thereby transferring the sand box 7 between the four stations. When transferring from station three to station four and from station four to station three, motor 1 22 drives the cross plate 21 to rotate 180 degrees, thereby driving the sand box 7 to flip, and the piston rod of the hydraulic cylinder 29 extends to push the sliding sleeve 28 to rise along the sliding hole of the slide table 27, so that the sliding sleeve 28 pushes the beam frame 20 to rise, thereby driving the sand box 7 to separate from the sand feeding pipe 3 and the air extraction pipe 5, and the piston rod of the hydraulic cylinder 29 contracts to drive the sliding sleeve 28 to descend along the sliding hole of the slide table 27, so that the sliding sleeve 28 drives the beam frame 20 to descend, thereby driving the sand box 7 to descend, and the sand box 7 is buckled onto the box cover 8, or the sand feeding pipe 3 and the air extraction pipe 5 are inserted into the sand box 7.

[0036] like Figures 1 to 10As shown, an aluminum alloy casting sand core molding machine of the present invention, when working, firstly, an empty sand box 7 is placed upside down on station one, and the box cover 8 is placed upside down on the table 17, and the lost mold is pre-installed on the inner end surface of the box cover 8, and the manipulator mechanism clamps the sand box 7 on the station one and transfers it to the top of the box cover 8, and the manipulator mechanism drives the sand box 7 to descend and snap it onto the box cover 8, and multiple tightening machines 19 respectively rotate multiple screws 9 so that multiple screws 9 are screwed with the threaded hole seats of the sand box 7, and then the manipulator mechanism transfers the sand box 7 to station three, and the manipulator mechanism drives the sand box 7 to descend, so that the sand feeding pipe 3 and the exhaust pipe 5 respectively pass through the jack of the box cover 8 and extend into the interior of the sand box 7, and the upper end of the exhaust pipe 5 extends into the bottom chamber between the filter plate 10 and the bottom wall of the sand box 7 through the through hole of the filter plate 10, and the vibration motor 34 contacts the side wall of the sand box 7, and then the sand feeding mechanism 1 The sand feeding machine works to convey the quartz sand in the sand storage box to the inside of the sand box 7 through the sand feeding pipe 3, and at the same time, the air exhauster 4 is turned on, and the air between the sand box 7 and the box cover 8 is extracted through the large number of micropores of the air exhaust pipe 5 and the filter plate 10, and the air in the sand box 7 is extracted. At the same time, multiple tightening machines 6 tighten multiple screws 9 respectively, so that multiple screws 9 push the box cover 8 toward the inside of the sand box 7, so that the box cover 8 presses the quartz sand inside the sand box 7 to form a sand core, and the vibration motor 34 runs the vibrating sand box 7, so that the quartz sand is poured into the sand box 7 more compactly and evenly. After the quartz sand is pressed by the box cover 8, the vibration motor 34 stops, and finally the manipulator mechanism pushes the vibration motor 34 and the cross bar 33 away from the molded sand box 7 to transfer it to the working four. During the transfer process, the manipulator mechanism flips the sand box 7 and places the sand box 7 upright on the workstation four, and the workstation four transports the upright sand box 7 to the casting workstation.

[0037] The main functions achieved by the present invention are:

[0038] 1. When adding quartz sand, the air is extracted to improve the quality of castings. It is suitable for lost foam casting and has good practicality.

[0039] 2. By setting a filter plate 10 at the bottom of the sand box 7, the suction pipe 5 is prevented from being blocked, thereby improving reliability;

[0040] 3. Avoid the lost foam from being crushed while ensuring that the quartz sand is compacted, thus improving the quality of the modeling;

[0041] 4. Ability to recycle and reuse leaked quartz sand;

[0042] 5. The sand box 7 can be vibrated to make the quartz sand more uniform and dense.

[0043] The installation method, connection method or setting method of the aluminum alloy casting sand core molding machine of the present invention are all common mechanical methods, and can be implemented as long as they can achieve their beneficial effects; the sand feeding mechanism, sand feeding pipe, vacuum pump, vacuum pipe, tightening machine one, screw, filter plate, pressure sensor, sand bucket, lifting auger, tightening machine two, motor one, double-head hydraulic cylinder, base plate, slide, sleeve, hydraulic cylinder, gear ring, motor three, gear, and vibration motor of the aluminum alloy casting sand core molding machine of the present invention are purchased on the market, and technical personnel in the industry only need to install and operate them according to the accompanying instruction manual, without the need for technical personnel in this field to pay creative labor.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sand core molding machine for aluminum alloy castings, comprising a sand feeding mechanism (1), wherein the sand feeding mechanism (1) is provided with a sand storage box and a sand feeding machine for feeding quartz sand, wherein the sand feeding machine feeds the quartz sand in the sand storage box to the outside; characterized in that: The machine also comprises a manipulator mechanism, a mounting frame (2), a sand delivery pipe (3), an air pump (4), an air pump pipe (5), a tightening machine (6), a sand box (7), a box cover (8) and a screw (9). The manipulator mechanism is mounted on the outside of the sand delivery mechanism (1). Four workstations are arranged around the circumference of the manipulator mechanism. Workstation one is used to deliver the inverted sand box (7). Workstation two is used to support the inverted box cover (8). A jack matching the sand delivery pipe (3) and the air pump pipe (5) is arranged on the box cover (8). A plurality of screws (9) are passed through the box cover (8). The plurality of screws (9) are threadedly connected to the threaded hole seats inside the sand box (7). The mounting frame (2) is located on the third workstation. A sand delivery pipe (3) and an air extraction pipe (5) are vertically mounted on the mounting frame (2), the upper end of the air extraction pipe (5) being higher than the upper end of the sand delivery pipe (3), the sand delivery machine of the sand delivery mechanism (1) being connected to the sand delivery pipe (3) through a pipeline, the air extraction port of the air extraction machine (4) being connected to the air extraction pipe (5) through a pipeline, a plurality of tightening machines (6) being mounted on the mounting frame (2), the plurality of tightening machines (6) being used to tighten a plurality of screw rods (9) to press the box cover (8) into the interior of the sand box (7), the workstation four being used to transport the sand box (7), the manipulator mechanism clamping the sand box (7) from the workstation one, passing through the workstation two and the workstation three in sequence, and flipping the sand box (7) to an upright position before placing it on the workstation four; The manipulator mechanism comprises a column assembly, a beam frame (20) and two gripper assemblies. The middle part of the beam frame (20) is rotatably mounted on the column assembly. The two gripper assemblies are respectively mounted on the two ends of the beam frame (20). The gripper assembly comprises a cross plate (21), a motor 1 (22), two groups of arm rods (23), two clamping plates (24) and a double-headed hydraulic cylinder (25). The middle part of the cross plate (21) is rotatably connected to the end of the beam frame (20). The motor 1 (22) is mounted on the end of the beam frame (20). The output shaft of the motor 1 (22) is transmission-connected to the cross plate (21). The inner ends of the two groups of arm rods (23) are respectively rotatably connected to the two ends of the cross plate (21). The outer ends of the two groups of arm rods (23) are both mounted with clamping plates (24). The two groups of arm rods (23) are symmetrically arranged. The two clamping plates (24) are symmetrically arranged. The two piston rods of the double-headed hydraulic cylinder (25) are respectively rotatably connected to the two groups of arm rods (23).

2. The aluminum alloy casting sand core molding machine according to claim 1, characterized in that: The filter plate (10) is also included. The filter plate (10) is installed at the bottom of the cavity of the sand box (7). A bottom chamber is provided between the filter plate (10) and the bottom wall of the sand box (7). A large number of micropores are provided on the filter plate (10). A through hole matching the air extraction pipe (5) is provided on the filter plate (10).

3. The aluminum alloy casting sand core molding machine according to claim 1, characterized in that: It also includes a plurality of blocking plates (11). The box cover (8) is provided with a plurality of casting holes. The plurality of blocking plates (11) are respectively rotatably mounted on the outer end surface of the box cover (8) via a rotating shaft. The plurality of blocking plates (11) respectively seal the plurality of casting holes.

4. The aluminum alloy casting sand core molding machine according to claim 1, characterized in that: It also comprises a plurality of pressure sensors (12), and the pressure sensors (12) are all arranged on the side walls of the plurality of sand delivery pipes (3).

5. The aluminum alloy casting sand core molding machine according to claim 1, characterized in that: The invention also comprises a sand hopper (13) and a lifting auger (14). The sand hopper (13) is installed below the mounting frame (2). The sand hopper (13) is used to receive quartz sand leaked from the sand box (7). The input end of the lifting auger (14) extends into the bottom of the sand hopper (13), and the output end of the lifting auger (14) extends into the sand storage box of the sand feeding mechanism (1).

6. The aluminum alloy casting sand core molding machine according to claim 3, characterized in that: It also includes a workbench (16), a table top (17), a plurality of positioning holes (18) and a plurality of tightening machines (19); the workbench (16) is mounted on the workstation (1), the table top (17) is mounted on the top of the workbench (16), a plurality of positioning holes (18) are arranged on the table top (17), the plurality of positioning holes (18) are matched with the plurality of blocking plates (11) respectively, the plurality of tightening machines (19) are mounted on the table top (17), and the plurality of tightening machines (19) are matched with the plurality of screw rods (9) respectively.

7. The aluminum alloy casting sand core molding machine according to claim 1, characterized in that: Each group of arm rods (23) comprises two arm rods (23), the two arm rods (23) are arranged in parallel, the inner ends of the two arm rods (23) are rotatably connected to the bracket on the outer side of the cross plate (21), and the outer ends of the two arm rods (23) are rotatably connected to the clamping plate (24), and the bracket, the two arm rods (23) and the clamping plate (24) form a parallelogram.

8. The aluminum alloy casting sand core molding machine according to claim 1, characterized in that: The column assembly comprises a base plate (26), a slide (27), a sleeve (28), a hydraulic cylinder (29), a gear ring (30), a motor three (31) and a gear (32). The slide (27) is mounted above the base plate (26) through a vertical rod. A sliding hole is arranged in the middle of the slide (27). The sleeve (28) is slidably inserted in the sliding hole of the slide (27). One end of the hydraulic cylinder (29) is connected to the base plate (26). The other end of the hydraulic cylinder (29) is connected to the sleeve (28). The middle of the beam frame (20) is rotatably mounted on the upper end of the sleeve (28). The gear ring (30) is coaxially movably sleeved on the outer side of the upper end of the sleeve (28). The gear ring (30) is mounted on the lower end surface of the beam frame (20). The motor three (31) is mounted on the sleeve (28). The output shaft of the motor three (31) is coaxially mounted with a gear (32). The gear (32) meshes with the gear ring (30).

9. The aluminum alloy casting sand core molding machine according to claim 1, characterized in that: It also includes a cross bar (33) and a vibration motor (34), the inner end of the cross bar (33) is elastically mounted on the sand feeding mechanism (1), the outer end of the cross bar (33) is mounted on the vibration motor (34), the vibration motor (34) extends into the third workstation, and the vibration motor (34) contacts the side wall of the sand box (7).

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