Sand cleaning device for sand mold casting of brake disc

Abstract

The utility model belongs to the technical field of brake disc casting, and relates to a brake disc sand mold casting sand cleaning device which comprises a U-shaped workbench, a mounting box is vertically arranged at the top in the workbench in a sliding mode, a driving assembly is arranged on the workbench and drives the mounting box to vertically move up and down, a cleaning disc is rotatably arranged below the mounting box, and the cleaning disc is arranged on the workbench. An air outlet assembly is arranged in the mounting box, a flow dividing pipe is rotationally arranged on one side of the mounting box and connected with the air outlet assembly, a plurality of air spraying heads are fixedly connected to the flow dividing pipe at intervals, a transmission assembly is arranged on the workbench, and when the mounting box drives the flow dividing pipe to move up and down, the transmission assembly drives the flow dividing pipe to rotate. A placing disc is horizontally and rotatably arranged at the bottom in the mounting box, and the cleaning disc corresponds to the placing disc up and down. The brake disc sand removing device has the advantages that when the cleaning disc rotates to remove sand on the brake disc, the air spraying head can blow away the sand on the brake disc, and the sand removing condition can be checked in time.

Description

TECHNICAL FIELD

[0001] The utility model belongs to brake disc casting technical field relates to a kind of brake disc sand mould casting sand cleaning device. BACKGROUND

[0002] Brake disc is generally casted with cast iron, and the common method in brake disc casting is sand casting. Sand casting refers to a casting method for producing castings in a sand mold. Since the castings cool and solidify, sand often remains on the surface and inside of the castings. Therefore, sand cleaning is needed after brake disc casting.

[0003] A brake disc sand mould casting sand cleaning device is disclosed in Chinese Patent CN219519723U, which includes a base, a placement disc arranged at the top center of the base, a moving plate arranged at the top of the placement disc, a drive assembly installed at the top of the moving plate, a cleaning disc connected to the output end of the drive assembly through a shaft sleeve penetrating the moving plate, lifting assemblies connecting the bottom sides of the moving plate to the top of the base, a conical column connected to the top center of the placement disc, and a plurality of support members arranged in a ring array on one side of the conical column along the circumferential direction of the placement disc.

[0004] The sand cleaning device cleans the brake disc by rotating the cleaning disc. However, during the cleaning process, some of the removed sand accumulates on the top of the brake disc, making it inconvenient to check the cleaning status in a timely manner.

[0005] To solve the above problems, the utility model provides a brake disc sand mould casting sand cleaning device. UTILITY MODEL CONTENTS

[0006] To solve the problems in the background art, the utility model provides a brake disc sand mould casting sand cleaning device.

[0007] To achieve the above purpose, the utility model adopts the following technical scheme: a U-shaped workbench, a mounting box vertically slidingly arranged at the top of the workbench, a drive assembly arranged on the workbench, the drive assembly driving the mounting box to vertically move up and down, a cleaning disc rotationally arranged below the mounting box, a third motor fixedly installed inside the mounting box, the third motor driving the cleaning disc to rotate, and an air outlet assembly arranged inside the mounting box.

[0008] A shunt pipe is rotationally arranged on one side of the mounting box, the shunt pipe is connected to the air outlet assembly, a plurality of air jet heads are fixedly connected to the shunt pipe at intervals, a transmission assembly is arranged on the workbench, and the transmission assembly drives the shunt pipe to rotate when the mounting box drives the shunt pipe to move up and down.

[0009] A placement disc is horizontally rotationally arranged at the bottom of the mounting box, and the cleaning disc corresponds to the placement disc up and down.

[0010] Further, the workbench is composed of a bottom plate and two side plates, the two side plates are fixedly connected to two ends of the bottom plate respectively, and the mounting box is arranged between the two side plates of the workbench.

[0011] Further, the driving assembly comprises a second motor, the second motor is fixedly connected to one side of one of the side plates of the workbench, and the output end of the second motor is fixedly connected with a lead screw, and the lead screw is vertically arranged;

[0012] The middle part of each of the two side plates of the workbench is provided with a sliding groove, the sliding groove is parallel to the lead screw, the mounting box is fixedly connected with a connecting block on each side, the end of each of the two connecting blocks is slidingly connected in the corresponding sliding groove, and the end of each of the two connecting blocks away from each other is fixedly connected with a sliding block, and one of the sliding blocks is threadedly sleeved on the lead screw.

[0013] Further, the top of the bottom plate of the workbench is fixedly connected with a first motor, the placing disc is fixedly connected to the top end of the output shaft of the first motor, and the top of the placing disc is provided with a brake disc.

[0014] Further, one side of the mounting box is fixedly connected with a connecting plate, the connecting plate is arranged in an inclined manner, the end of the connecting plate is fixedly connected with a mounting cylinder, the shunt pipe is rotatably connected to the inside of the mounting cylinder, and a groove matched with the air jet head is formed in the mounting cylinder.

[0015] Further, the transmission assembly comprises a rack, and the rack is fixedly connected to one side of one of the side plates of the workbench.

[0016] One end of the shunt pipe is fixedly connected with a rotating shaft, the rotating shaft rotatably penetrates the end face of the mounting cylinder, and the end of the rotating shaft is fixedly connected with an incomplete gear, and the incomplete gear is engaged with the rack.

[0017] Further, the output shaft of the third motor rotatably penetrates the bottom surface of the mounting box, and the cleaning disc is fixedly connected to the bottom end of the output shaft of the third motor.

[0018] Further, the air outlet assembly comprises an air tank, the air tank is fixedly connected to the top of the mounting box in the mounting box, the top of the mounting box is fixedly penetrated with an air inlet pipe and an air outlet pipe, one end of each of the air inlet pipe and the air outlet pipe extends into the inside of the air tank, each of the air inlet pipe and the air outlet pipe is provided with a one-way valve, and the other end of the air outlet pipe is connected with the end of the shunt pipe through a rotary joint.

[0019] The inside of the air tank is sealingly and slidingly connected with a piston plate, the bottom of the piston plate is fixedly connected with a piston rod, the piston rod slidingly penetrates the bottom surface of the air tank, and there is a gap between the piston rod and the bottom surface of the air tank.

[0020] The inside of the mounting box is provided with a lifting assembly, and the lifting assembly drives the piston rod to vertically move up and down.

[0021] Further, the lifting assembly comprises a reciprocating screw rod, the reciprocating screw rod is vertically arranged, the top end of the reciprocating screw rod is rotationally connected to the bottom surface of the air tank, the bottom end of the reciprocating screw rod is rotationally connected to the bottom surface of the inner cavity of the mounting box, the bottom end of the piston rod is connected with the reciprocating screw rod through a nut, and the nut and the reciprocating screw rod are connected with each other by taking a steel ball as a rolling body.

[0022] The output shaft of the third motor is fixedly sleeved with a first gear, and the outer surface of the bottom of the reciprocating screw rod is fixedly sleeved with a second gear, and the second gear is engaged with the first gear.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] 1. The sand cleaning device for brake disc sand casting is provided with a shunt pipe, the shunt pipe is rotationally arranged on the mounting box, when the mounting box drives the cleaning disc to move downwards to clean the brake disc, the shunt pipe will also move downwards, and in the moving process, the shunt pipe will blow air to the top of the brake disc through the air jet head, and part of the sand will be blown away, and when the incomplete gear moves to be engaged with the rack, the rack will drive the incomplete gear and the shunt pipe to rotate, so that the air blowing area of the air jet head is increased, and after the cleaning disc moves to the top of the brake disc, the air jet head always blows air to the top of the brake disc, so that the sand can be blown away in the sand cleaning process, and the sand cleaning condition can be checked in time.

[0025] 2. The sand cleaning device for brake disc sand casting is provided with an air tank, when the third motor drives the cleaning disc to rotate to clean the brake disc, the output shaft of the third motor will drive the second gear to rotate through the first gear, so that the reciprocating screw rod rotates, and the piston plate is driven to move up and down in the air tank through the piston rod, so that the shunt pipe is blown, and a fan is not needed to blow air, so that the production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a three-dimensional structure schematic view of the first visual angle of the utility model;

[0027] Figure 2 It is a three-dimensional structure schematic view of the second visual angle of the utility model;

[0028] Figure 3 It is a structure schematic view of a placing disc in the utility model;

[0029] Figure 4 It is a structure schematic view of a mounting box in the utility model;

[0030] Figure 5 It is a structure schematic view of a shunt pipe in the utility model.

[0031] In the diagram: 1. Workbench; 101. Slide; 2. First motor; 3. Placement tray; 301. Positioning block; 302. Limiting rod; 4. Brake disc; 5. Cleaning tray; 6. Mounting box; 7. Guide rod; 8. Connecting block; 9. Slider; 10. Inlet pipe; 11. Outlet pipe; 12. Support block; 13. Lead screw; 14. Connecting plate; 15. Mounting cylinder; 16. Incomplete gear; 17. Second motor; 18. Rack; 19. Air box; 20. Piston rod; 21. Reciprocating lead screw; 22. Diverter pipe; 23. Jet nozzle; 24. Third motor; 25. First gear; 26. Second gear; 27. Piston plate. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] like Figures 1-5 As shown, the technical solution adopted by this utility model is as follows: a sand cleaning device for brake disc sand casting, including a U-shaped workbench 1, and an installation box 6 is vertically slidably arranged on the top of the workbench 1.

[0034] The workbench 1 consists of a base plate and two side plates, which are fixedly connected to the two ends of the base plate. The combined shape of the two side plates and the base plate is U-shaped. The mounting box 6 is located between the two side plates of the workbench 1.

[0035] A drive component is installed on the workbench 1, which drives the mounting box 6 to move vertically up and down.

[0036] The drive assembly includes a second motor 17, which is fixedly connected to one side of one of the side plates of the worktable 1. A lead screw 13 is fixedly connected to the output end of the second motor 17, and the lead screw 13 is vertically arranged. The second motor 17 drives the lead screw 13 to rotate.

[0037] The two side plates of the workbench 1 each have a sliding groove 101 in the middle, which is parallel to the lead screw 13. Connecting blocks 8 are fixedly connected to both sides of the mounting box 6, and the ends of the two connecting blocks 8 are slidably connected within the corresponding sliding grooves 101. The sliding grooves 101 limit the movement of the connecting blocks 8, thus positioning the vertical movement of the mounting box 6.

[0038] Each of the two connecting blocks 8 has a slider 9 fixedly connected to one of its far ends, with one slider 9 threaded onto the lead screw 13. When the lead screw 13 rotates, it drives the corresponding slider 9 to move up or down, thereby moving the connecting block 8 and the mounting box 6.

[0039] One side of the side plate provided with the lead screw 13 is fixedly provided with one guide rod 7, and one side of the other side plate is fixedly provided with two guide rods 7. Both ends of each guide rod 7 are fixedly connected with a support block 12, and the support block 12 is fixedly connected to one side of the corresponding side plate.

[0040] The guide rod 7 is parallel to the lead screw 13, and the sliding block 9 is slidingly sleeved on the corresponding guide rod 7. The guide rod 7 repositions the sliding block 9, thereby increasing the stability of the mounting box 6.

[0041] The mounting box 6 is rotatably provided below the cleaning disc 5, and the third motor 24 is fixedly installed in the mounting box 6. The third motor 24 drives the cleaning disc 5 to rotate.

[0042] The output shaft of the third motor 24 penetrates downward through the bottom surface of the mounting box 6, and the cleaning disc 5 is fixedly connected to the bottom end of the output shaft of the third motor 24. The bottom of the cleaning disc 5 is uniformly provided with a plurality of bristles, so as to clean sand through the cleaning disc 5.

[0043] The mounting box 6 is provided with an air outlet assembly.

[0044] The mounting box 6 is rotatably provided with a shunt pipe 22 on one side, and the shunt pipe 22 is connected with the air outlet assembly. The shunt pipe 22 is ventilated through the air outlet assembly. A plurality of air jet heads 23 are fixedly connected on the shunt pipe 22 at intervals. The gas in the shunt pipe 22 is sprayed out through the air jet heads 23.

[0045] The mounting box 6 is fixedly connected with a connecting plate 14 on one side, and the connecting plate 14 is obliquely arranged. The end of the connecting plate 14 is fixedly connected with a mounting cylinder 15, and the shunt pipe 22 is rotatably connected in the mounting cylinder 15. The shunt pipe 22 is positioned through the mounting cylinder 15. The mounting cylinder 15 is provided with a groove matched with the air jet head 23, and the air jet head 23 penetrates through the groove.

[0046] The air outlet assembly comprises an air tank 19, which is fixedly connected to the top of the mounting box 6. The air inlet pipe 10 and the air outlet pipe 11 are fixedly penetrated through the top of the mounting box 6, and one end of each of the air inlet pipe 10 and the air outlet pipe 11 extends into the inside of the air tank 19. The inside of the air tank 19 is ventilated through the air inlet pipe 10. The gas in the air tank 19 is introduced into the shunt pipe 22 through the air outlet pipe 11.

[0047] The other end of the air outlet pipe 11 is connected with the end of the shunt pipe 22 through a rotary joint. The rotary joint is a pipe connecting device, and the connected pipes can rotate relative to each other. The shunt pipe 22 is rotated through the rotary joint.

[0048] The air inlet pipe 10 and the air outlet pipe 11 are both provided with a one-way valve. The one-way valve allows the air inlet pipe 10 to only exhaust into the air tank 19, and the one-way valve allows the air outlet pipe 11 to only exhaust into the shunt pipe 22.

[0049] The inside of the air tank 19 is sealingly connected with a piston plate 27, the bottom of the piston plate 27 is fixedly connected with a piston rod 20, the piston rod 20 slidingly penetrates the bottom surface of the air tank 19. There is a gap between the piston rod 20 and the bottom surface of the air tank 19. So that the outside air can communicate with the cavity at the bottom of the piston plate 27 through the gap.

[0050] The inside of the installation box 6 is provided with a lifting assembly, the lifting assembly drives the piston rod 20 to move vertically up and down. The piston rod 20 will drive the piston plate 27 to move in the inside of the air tank 19.

[0051] The lifting assembly includes a reciprocating screw rod 21, which is vertically arranged. The top end of the reciprocating screw rod 21 is rotatably connected to the bottom surface of the air tank 19, and the bottom end of the reciprocating screw rod 21 is rotatably connected to the bottom surface of the inner cavity of the installation box 6. The bottom end of the piston rod 20 is connected with the reciprocating screw rod 21 through a nut, and the reciprocating screw rod 21 and the nut are connected with a steel ball as a rolling body. The reciprocating screw rod 21, the nut and the steel ball form a ball screw pair, and when the reciprocating screw rod 21 rotates, it will drive the piston rod 20 to move up and down.

[0052] A first gear 25 is fixedly sleeved on the output shaft of the third motor 24, and a second gear 26 is fixedly sleeved on the outer surface of the bottom of the reciprocating screw rod 21, and the second gear 26 is engaged with the first gear 25. The output shaft of the third motor 24 drives the first gear 25 to rotate, and the first gear 25 drives the second gear 26 to rotate, so that the reciprocating screw rod 21 rotates.

[0053] The workbench 1 is provided with a transmission assembly, and when the installation box 6 drives the shunt pipe 22 to move up and down, the transmission assembly drives the shunt pipe 22 to rotate.

[0054] The transmission assembly includes a rack 18, which is fixedly connected to one side of one side plate of the workbench 1.

[0055] One end of the shunt pipe 22 is fixedly connected with a rotating shaft, and the rotating shaft rotates through the end surface of the mounting cylinder 15. The end of the rotating shaft is fixedly connected with an incomplete gear 16, and the incomplete gear 16 is engaged with the rack 18. When the installation box 6 drives the shunt pipe 22 and the incomplete gear 16 to move, when the incomplete gear 16 moves to the rack 18, the rack 18 will drive the incomplete gear 16 to rotate.

[0056] There is a frictional damping between the inner wall of the mounting cylinder 15 and the outer surface of the shunt pipe 22. So that only the transmission assembly can drive the shunt pipe 22 to rotate, and after the incomplete gear 16 leaves the rack 18, the shunt pipe 22 no longer rotates.

[0057] The bottom of the installation box 6 is horizontally rotatably provided with a placing disc 3, and the cleaning disc 5 corresponds to the placing disc 3 up and down.

[0058] The top of the bottom plate of the workbench 1 is fixedly connected with a first motor 2, and a placing disc 3 is fixedly connected to the top end of the output shaft of the first motor 2. The first motor 2 drives the placing disc 3 to rotate. The top of the placing disc 3 is provided with a brake disc 4. In order to clean the sand on the brake disc 4, a cleaning disc 5 is arranged.

[0059] The middle of the top surface of the placing disc 3 is fixedly connected with a positioning block 301, and the top of the placing disc 3 is fixedly connected with a plurality of limiting rods 302. The plurality of limiting rods 302 are distributed in a circumferential array about the positioning block 301. The brake disc 4 is sleeved on the positioning block 301 and the plurality of limiting rods 302, and the brake disc 4 is positioned on the placing disc 3.

[0060] Working principle:

[0061] In use, the brake disc 4 to be desanded is sleeved on the positioning block 301 and the plurality of limiting rods 302, and the brake disc 4 is positioned on the top of the placing disc 3. At this time, the brake disc 4 corresponds to the cleaning disc 5 up and down.

[0062] Start the second motor 17 and the third motor 24.

[0063] The output shaft of the second motor 17 rotates in the positive direction, driving the lead screw 13 to rotate. The lead screw 13 drives the corresponding sliding block 9 to move downward, and the sliding block 9 slides on the corresponding guide rod 7, driving the connecting block 8 to slide downward in the corresponding sliding groove 101. The mounting box 6 moves downward between the two side plates of the workbench 1. The mounting box 6 drives the cleaning disc 5, the mounting cylinder 15, and the air jet head 23 to move downward.

[0064] The output shaft of the third motor 24 drives the first gear 25 and the cleaning disc 5 to rotate, the first gear 25 drives the second gear 26 to rotate, and the reciprocating lead screw 21 rotates. When the reciprocating lead screw 21 rotates, it drives the piston rod 20 to move up and down, and the piston plate 27 moves up and down in the air tank 19.

[0065] When the piston plate 27 moves upward, the gas in the air tank 19 located on the top of the piston plate 27 is discharged into the shunt pipe 22 through the air outlet pipe 11. Then it is sprayed out through the air jet head 23, and the air jet head 23 blows the gas towards the brake disc 4. The sand on the brake disc 4 is blown away, and the brake disc 4 is preliminarily cleaned.

[0066] When the piston plate 27 moves downward, external gas enters the air tank 19 through the air inlet pipe 10. Then, through the up-and-down movement of the piston plate 27, the air jet head 23 intermittently blows air.

[0067] When the incomplete gear 16 moves downward to engage with the rack 18, the rack 18 drives the incomplete gear 16 to rotate. The shunt pipe 22 rotates in the mounting cylinder 15, and the air jet head 23 gradually tends to be horizontal. Since the air outlet pipe 11 is connected with the shunt pipe 22 through a rotary joint, the rotation of the shunt pipe 22 does not affect the gas delivery.

[0068] When the cleaning disc 5 rotates to the top of the brake disc 4, the air jet head 23 sprays air to the top surface of the brake disc 4. At this time, the rotation of the cleaning disc 5 can clean the sand on the brake disc 4, and the air jet head 23 can blow away the cleaned sand.

[0069] Start the first motor 2, and the output shaft of the first motor 2 drives the placement disc 3 to rotate, so that the brake disc 4 rotates. This can make the sand cleaning effect better.

[0070] After the sand cleaning is completed, the output shaft of the second motor 17 reverses, the lead screw 13 drives the mounting box 6 to move upward. This can make the cleaning disc 5 move away from the brake disc 4, so that the brake disc 4 can be taken out.

[0071] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A sand cleaning device for sand casting brake discs, characterized in that The utility model provides a cleaning device for the workbench, including the workbench (1) of U shape, the top vertical sliding of inside workbench (1) is provided with installation box (6), be provided with drive assembly on workbench (1), drive assembly drives installation box (6) vertical up and down movement, the lower rotation of installation box (6) is provided with cleaning disc (5), the inside fixed mounting of installation box (6) is provided with third motor (24), third motor (24) drives cleaning disc (5) rotation, the inside of installation box (6) is provided with air outlet assembly, One side of installation box (6) is rotatably provided with a shunt pipe (22), the shunt pipe (22) is connected with the air outlet assembly, a plurality of air injection heads (23) are fixedly connected on the shunt pipe (22) at intervals, the workbench (1) is provided with a transmission assembly, when the installation box (6) drives the shunt pipe (22) to move up and down, the transmission assembly drives the shunt pipe (22) to rotate. The bottom of the installation box (6) is horizontally rotatably provided with a placement disc (3), and the cleaning disc (5) corresponds to the placement disc (3) up and down.

2. A sand cleaning device for sand casting brake discs according to claim 1, characterised in that: The workbench (1) is composed of a bottom plate and two side plates, the two side plates are respectively fixedly connected to the two ends of the bottom plate, and the installation box (6) is arranged between the two side plates of the workbench (1).

3. A sand cleaning device for sand casting brake discs according to claim 2, characterised in that: The drive assembly comprises a second motor (17) fixedly connected to one side of one of the side plates of the workbench (1), an output end of the second motor (17) is fixedly connected with a lead screw (13), and the lead screw (13) is vertically arranged. The middle part of each of the two side plates of the workbench (1) is provided with a sliding groove (101), the sliding groove (101) is parallel to the lead screw (13), both sides of the installation box (6) are fixedly connected with connecting blocks (8), the end parts of the two connecting blocks (8) are slidably connected in the corresponding sliding grooves (101), and the ends of the two connecting blocks (8) away from each other are fixedly connected with sliding blocks (9), one of the sliding blocks (9) is threadedly sleeved on the lead screw (13).

4. A sand cleaning device for sand casting brake discs according to claim 2, characterised in that: The top of the bottom plate of the workbench (1) is fixedly connected with a first motor (2), the placement disc (3) is fixedly connected to the top end of the output shaft of the first motor (2), and the top of the placement disc (3) is provided with a brake disc (4).

5. A sand cleaning device for sand casting brake discs according to claim 2, characterised in that: One side of the installation box (6) is fixedly connected with a connecting plate (14), the connecting plate (14) is arranged obliquely, an end part of the connecting plate (14) is fixedly connected with a mounting cylinder (15), the shunt pipe (22) is rotatably connected in the mounting cylinder (15), and a groove matched with the air injection head (23) is formed in the mounting cylinder (15).

6. A sand cleaning device for sand casting brake discs according to claim 5, characterised in that: The transmission assembly comprises a rack (18) fixedly connected to one side of one of the side plates of the workbench (1). One end of the shunt pipe (22) is fixedly connected with a rotating shaft, the rotating shaft penetrates through the end face of the mounting cylinder (15) and is rotatable, an end part of the rotating shaft is fixedly connected with an incomplete gear (16), and the incomplete gear (16) is engaged with the rack (18).

7. A sand cleaning device for sand casting brake discs according to claim 1, characterised in that: The output shaft of the third motor (24) downwardly penetrates through the bottom surface of the installation box (6), and the cleaning disc (5) is fixedly connected to the bottom end of the output shaft of the third motor (24).

8. A sand cleaning device for sand casting brake discs according to claim 7, characterised in that: The air outlet assembly comprises an air tank (19) fixedly connected to the top of the mounting box (6), the top of the mounting box (6) is fixedly penetrated by an air inlet pipe (10) and an air outlet pipe (11), one end of the air inlet pipe (10) and the air outlet pipe (11) extends into the air tank (19), a one-way valve is arranged on the air inlet pipe (10) and the air outlet pipe (11), and the other end of the air outlet pipe (11) is connected with the end of the shunt pipe (22) through a rotary joint; The inside of the air tank (19) is sealingly and slidably connected with a piston plate (27), the bottom of the piston plate (27) is fixedly connected with a piston rod (20), the piston rod (20) slidably penetrates the bottom surface of the air tank (19), and a gap is formed between the piston rod (20) and the bottom surface of the air tank (19); The inside of the mounting box (6) is provided with a lifting assembly, the lifting assembly drives the piston rod (20) to vertically move up and down.

9. A sand cleaning device for sand casting brake discs according to claim 8, characterised in that: The lifting assembly comprises a reciprocating screw (21), the reciprocating screw (21) is vertically arranged, the top end of the reciprocating screw (21) is rotationally connected to the bottom surface of the air tank (19), the bottom end of the reciprocating screw (21) is rotationally connected to the bottom surface of the inner cavity of the mounting box (6), the bottom end of the piston rod (20) is connected with the reciprocating screw (21) through a nut, and the nut and the reciprocating screw (21) are connected with a steel ball as a rolling body; A first gear (25) is fixedly sleeved on the output shaft of the third motor (24), and a second gear (26) is fixedly sleeved on the outer surface of the bottom of the reciprocating screw (21), and the second gear (26) is engaged with the first gear (25).

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