Iron mold sand-coated casting demolding device and method thereof

Abstract

The invention relates to the technical field of casting demolding, in particular to an iron mold sand-coated casting demolding device and method. Comprising a moving frame, a moving frame is arranged at the bottom of the moving frame, a mold is arranged below the moving frame, a protection assembly is arranged below a clamping assembly, and an automatic demolding assembly is arranged on the surface of the protection assembly and used for demolding a casting attached to the interior of the mold. A piston rod at the end of a second air cylinder is controlled to drive a moving plate to move in the vertical direction, when the top of an inserting rod moves to the bottom of a mold, the output end of a servo motor drives a second lead screw to rotate, a moving block arranged on the surface of the second lead screw moves in the horizontal direction, and the moving block pushes the bottom of the inserting rod in the moving process; and the inserting rods move in the vertical direction, and the moving blocks drive the inserting rods to sequentially insert coated sand on the inner edge of the mold in the moving process, so that the mold is prevented from being frequently knocked for demolding, and the service life of the mold is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of casting demoulding, in particular to a casting demoulding device and method for a sand-coated iron mold. Background Art

[0002] In the process of casting production, the iron mold sand coating process is widely used. This process has the advantages of high casting size accuracy, good surface quality, high production efficiency, etc. When the iron mold sand coating casting is demoulded, it is usually necessary to manually knock the mold (102). This traditional demoulding method has the following shortcomings:

[0003] Firstly, the manual knocking of the mold is inefficient. Workers need to spend a lot of time and energy on the knocking operation. Moreover, it is difficult to ensure the consistency of the strength and position of each knock, which leads to different demolding times and seriously affects production efficiency. Secondly, manual knocking of the mold is likely to cause damage to the casting and the mold. Since the knocking force is difficult to accurately control, excessive knocking force may cause defects such as cracks and deformation in the casting, reducing the quality of the casting. At the same time, frequent knocking will also cause wear on the mold and shorten the service life of the mold.

[0004] Therefore, a casting demoulding device and method for sand-coated iron mold are proposed. Summary of the invention

[0005] The object of the present invention is to provide a device and method for demoulding a casting with sand coated on an iron mold, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, one of the objects of the present invention is to provide a demolding device for a casting covered with sand in an iron mold, comprising a movable frame, a movable frame is provided at the bottom of the movable frame, a mold is provided below the movable frame, a first cylinder is provided at the bottom of the movable frame, a frame plate is provided at the piston rod at the end of the first cylinder, limit rods are provided at the four corners of the movable frame and the frame plate, a clamping assembly is provided at the bottom of the frame plate, the clamping assembly is used to clamp and fix the mold, a protective assembly is provided below the clamping assembly, the protective assembly protects the casting inside the mold that is clamped and lifted to a high altitude, and prevents the casting from falling to the ground, bumping and deforming during the lifting process, and an automatic demolding assembly is provided on the surface of the protective assembly, and the automatic demolding assembly is used to demold the casting attached to the inside of the mold.

[0007] As a further improvement of the present technical solution, the clamping assembly includes a rotating motor provided on the surface of a frame plate, the output end of the rotating motor passes through the frame plate and a main gear is provided at the end, sub-gears are provided on both sides of the main gear, the sub-gears mesh and rotate on both sides of the main gear, a first screw rod is provided at the end of the sub-gear, a movable clamping plate is provided on the surface of the first screw rod, and when the first screw rod rotates, it drives the movable clamping plate to move relative to each other.

[0008] As a further improvement of the present technical solution, the protection component includes a first gear rod arranged on both sides of the frame plate, a second gear rod is slidably provided on both sides of the inner wall of the movable frame, a rotating gear is provided between the first gear rod and the second gear rod, a support plate is provided under the second gear rod, a groove block is provided at the end of the support plate, a wire winding groove is provided at the top of the groove block, and a pull rope is provided between the second gear rod and the groove block.

[0009] As a further improvement of the technical solution, column tubes are provided on both sides of the bottom of the movable frame, a push rod is slidably provided on the inner wall of the column tube, the push rod is fixed to the end of the support plate, and an elastic member is provided between the column tube and the push rod.

[0010] As a further improvement of the technical solution, fixed pulleys are provided on both sides of the movable frame, and the pull rope is attached to the bottom of the fixed pulley and is parallel to the push rod.

[0011] As a further improvement of the present technical solution, the automatic demoulding assembly includes a second cylinder provided at the bottom of the support plate, a movable plate provided at the end of the piston rod at the end of the second cylinder, a servo motor provided on the outer wall of the movable plate, a second screw rod provided at the output end of the servo motor, and a movable plate provided on the surface of the second screw rod.

[0012] As a further improvement of the present technical solution, a fixed groove block is provided above the movable plate, and an insertion rod is slidably provided in the fixed groove block. The top of the insertion rod is cone-shaped, and a tooth cone is provided near the top of the insertion rod. The tooth cone forms an angle of 30° with the vertical direction. A reset spring is provided between the insertion rod and the fixed groove block to push the insertion rod to move up in the vertical direction. The insertion rod is made of iron, and is reset by the force of the reset spring in the absence of external force.

[0013] As a further improvement of the technical solution, the moving block is wedge-shaped, a limiting groove is provided on the top of the moving block, an iron core is arranged in the limiting groove, a coil is wound around the iron core, and when the coil is energized, the iron core attracts the bottom of the insertion rod.

[0014] The second object of the present invention is to provide a transformer coil shaping method, comprising the iron mold sand-covered casting demoulding device as described in any one of the above, comprising the following steps:

[0015] S1. Control the first cylinder to drive the frame plate to move downward in the vertical direction, control the clamping assembly to clamp and fix the top of the mold, and control the piston rod at the end of the first cylinder to move in the vertical direction, thereby driving the frame plate to move in the vertical direction, and quickly clamping and lifting the mold;

[0016] S2. When the clamping assembly is driven to move vertically by the frame plate, the protection assembly moves relatively, and the casting inside the mold is supported during the relative movement to prevent the casting from falling off and colliding on the ground, thereby protecting the casting;

[0017] S3. The sand-coated casting inside the raised mold is quickly demolded by an automatic demoulding component, thereby increasing the service life of the mold.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the demoulding device for castings covered with sand in the iron mold, the piston rod at the end of the second cylinder is controlled to drive the moving plate to move in the vertical direction. When the top of the insertion rod moves to the bottom of the mold, the output end of the servo motor drives the second screw to rotate, so that the moving block provided on the surface of the second screw moves in the horizontal direction. The moving block pushes the bottom of the insertion rod during the movement, so that the insertion rod moves in the vertical direction. When the moving block moves away from the insertion rod, the insertion rod is reset by the force of the reset spring. During the movement, the moving block drives the insertion rod to insert the sand on the inner edge of the mold in sequence. During the insertion process, the sand scatters until the sand loosens and falls off from the inside of the mold to the surface of the support plate, thereby avoiding frequent knocking and demoulding of the mold and improving the service life of the mold.

[0020] 2. In the demoulding device for the casting covered with sand in the iron mold, when the iron core moves to the end of the second screw rod, the output shaft at the end of the servo motor is controlled to rotate in the opposite direction, and the coil on the surface of the iron core is energized. A magnetic field is generated above the iron core to adsorb the insertion rod during the return movement to prevent the insertion rod from being stuck inside the mold during the insertion of the sand. The insertion rod is driven by the magnetic field of the iron core to drive the tooth cone on the top to pull the sand covering nearby to fall. After the iron core completes the reciprocating motion process, the second cylinder is controlled to drive the moving plate to move in the vertical direction, so that the iron core repeatedly moves to drive the insertion rod to demould the sand-covered casting inside the mold, thereby improving the demoulding efficiency.

[0021] 3. In the demoulding device for castings covered with sand in the iron mold, when the mold is clamped by the moving clamp, the moving clamp drives the mold to move upward in the vertical direction. At this time, the first gear rod and the second gear rod on both sides of the moving clamp are in opposite directions of movement. During the downward movement of the second gear rod, the pulling force of the pull rope on the end of the support plate gradually decreases. At this time, the push rod at the end of the support plate moves relative to the push force of the elastic part. During the relative movement of the support plate, the casting inside the mold is supported to prevent the casting from falling off and colliding on the ground and causing deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the mobile frame of the present invention;

[0024] Figure 3 It is a cross-sectional view of the movable frame of the present invention;

[0025] Figure 4For the present invention Figure 3 Schematic diagram of point A;

[0026] Figure 5 It is a schematic diagram of the structure of the protection component of the present invention;

[0027] Figure 6 For the present invention Figure 5 Schematic diagram of point B;

[0028] Figure 7 It is a schematic diagram of the structure of the protection component of the present invention;

[0029] Figure 8 It is a schematic diagram of the structure of the automatic demoulding component of the present invention.

[0030] The meaning of each number in the figure is:

[0031] 100, mobile rack; 101, mobile frame; 102, mold;

[0032] 200, first cylinder; 201, frame plate; 202, limit rod;

[0033] 300, clamping assembly; 301, rotating motor; 302, main gear; 303, secondary gear; 304, first screw rod; 305, moving clamping plate;

[0034] 400, protection assembly; 401, first gear rod; 402, rotating gear; 403, second gear rod; 404, column; 405, push rod; 406, elastic member; 407, support plate; 408, fixed pulley; 409, winding groove;

[0035] 500, automatic demoulding assembly; 501, second cylinder; 502, moving plate; 503, servo motor; 504, second screw rod; 505, moving block; 506, iron core; 507, insert rod; 508, return spring. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1 As shown, one of the purposes of the present invention is to provide a casting demoulding device for iron mold covered with sand, referring to Figure 1-Figure 8As shown, it includes a moving frame 100, a moving frame 101 is provided at the bottom of the moving frame 100, a mold 102 is provided below the moving frame 101, a first cylinder 200 is provided at the bottom of the moving frame 101, a frame plate 201 is provided at the end piston rod of the first cylinder 200, and limiting rods 202 are provided at the four corners of the moving frame 101 and the frame plate 201. A clamping assembly 300 is provided at the bottom of the frame plate 201, and the clamping assembly 300 is used to clamp and fix the mold 102. A protection assembly 400 is provided below the clamping assembly 300, and the protection assembly 400 protects the casting inside the mold 102 that is clamped and lifted to a high altitude to prevent the casting from falling to the ground and bumping and deforming during the lifting process. An automatic demolding assembly 500 is provided on the surface of the protection assembly 400, and the automatic demolding assembly 500 is used to demold the casting attached to the inside of the mold 102.

[0038] In order to facilitate the rapid lifting of the mold 102 and demoulding of the casting inside the mold 102, so that the casting inside the mold 102 falls off, the clamping assembly 300 includes a rotating motor 301 arranged on the surface of the frame plate 201, the output end of the rotating motor 301 passes through the frame plate 201 and is provided with a main gear 302 at the end, and sub-gears 303 are provided on both sides of the main gear 302. The sub-gears 303 mesh and rotate on both sides of the main gear 302. A first screw rod 304 is provided at the end of the sub-gear 303, and a movable clamping plate 305 is provided on the surface of the first screw rod 304. When the first screw rod 304 rotates, it drives the movable clamping plate 305. 5 relative movement, by controlling the output end of the rotating motor 301 to rotate, the rotating motor 301 drives the main gear 302 to rotate, and the sub-gears 303 provided on both sides of the main gear 302 mesh and rotate, and the sub-gears 303 drive the first screw rod 304 to rotate during the rotation process, and the moving clamping plate 305 provided on the surface of the first screw rod 304 moves relatively to clamp and fix the top of the mold 102, and the piston rod at the end of the first cylinder 200 is controlled to move in the vertical direction, thereby driving the frame plate 201 to move in the vertical direction, so as to facilitate the rapid clamping and lifting of the mold 102 and demoulding of the casting inside it.

[0039] In the process of demoulding the casting, when the casting material is aluminum, its hardness is relatively soft. When the casting falls from a high altitude after demoulding, its edge is easy to hit the ground, causing deformation of the casting, affecting its subsequent processing and use. Therefore, the protection component 400 includes a first gear rod 401 arranged on both sides of the frame plate 201, a second gear rod 403 is slidably arranged on both sides of the inner wall of the moving frame 101, a rotating gear 402 is arranged between the first gear rod 401 and the second gear rod 403, a support plate 407 is arranged under the second gear rod 403, a groove block is arranged at the end of the support plate 407, a winding groove 409 is arranged on the top of the groove block, and a There is a pull rope, and cylinders 404 are provided on both sides of the bottom of the moving frame 101. A push rod 405 is slidably provided on the inner wall of the cylinder 404. The push rod 405 is fixed to the end of the support plate 407. An elastic member 406 is provided between the cylinder 404 and the push rod 405. When the first cylinder 200 drives the frame plate 201 to move downward in the vertical direction, the frame plate 201 drives the first gear rod 401 to move downward. When the first gear rod 401 moves, it drives the rotating gear 402 to rotate, so that the second gear rod 403 moves in the opposite direction to the movement of the first gear rod 401, that is, when the first gear rod 401 moves downward in the vertical direction, the second gear rod 403 moves upward in the vertical direction, and the second gear rod 403 moves upward in the vertical direction. 03 During the movement, the pull rope is pulled, and the pull rope pulls the groove block at the end of the support plate 407, so that the support plate 407 moves to both sides in the horizontal direction. The support plates 407 are used to form an opening, which is convenient for the mobile clamping plate 305 to clamp and fix both sides of the mold 102. When the clamping is completed, the mobile clamping plate 305 drives the mold 102 to move upward in the vertical direction. At this time, the first gear rod 401 and the second gear rod 403 on both sides of the mobile clamping plate 305 are in opposite movement directions. When the second gear rod 403 moves downward, the pull rope tension on the end of the support plate 407 gradually decreases. At this time, the push rod 405 at the end of the support plate 407 is pushed by the elastic member 406. The force is in relative motion, and the support plate 407 supports the casting inside the mold 102 during the relative motion to prevent the casting from falling off and hitting the ground and causing deformation, thereby protecting the casting and increasing its service life. Moreover, considering the different sizes of the mold 102, in order to enable the support plate 407 to adapt to the mold 102 to support the demoulding casting inside it, a groove block is provided at the end of the support plate 407, and a wire winding groove 409 is provided on the top of the groove block. By pulling the pull rope close to one end of the support plate 407 so that it passes through the wire winding groove 409 and is wound around the surface of the groove block, the extension length of the support plate 407 is adjusted to improve the practicability of the device.

[0040] In order to improve the stretching efficiency and avoid uneven force on the rope during the stretching process, which affects the service life of the rope, fixed pulleys 408 are provided on both sides of the movable frame 101. The rope fits the bottom of the fixed pulley 408 and is parallel to the push rod 405. The rope fits the bottom of the fixed pulley 408 during the movement. The fixed pulley 408 is used to adjust the tension of the rope at the moving end of the support plate 407 so that it is always in a horizontal plane, thereby improving the service life of the rope.

[0041] In order to improve the demoulding efficiency during the demoulding process, the automatic demoulding component 500 includes a second cylinder 501 at the bottom of the support plate 407, a movable plate 502 at the end of the piston rod at the end of the second cylinder 501, a servo motor 503 at the outer wall of the movable plate 502, a second screw rod 504 at the output end of the servo motor 503, a movable block 505 on the surface of the second screw rod 504, a fixed groove block is provided above the movable plate 502, a plug rod 507 is slidably provided in the fixed groove block, the top of the plug rod 507 is cone-shaped, and a tooth cone is provided near the top of the plug rod 507, the tooth cone is at an angle of 30° with the vertical direction, and the plug rod 507 A return spring 508 is provided between the fixed slot block to push the insertion rod 507 to move up in the vertical direction. The insertion rod 507 is made of iron. In the absence of external force, the insertion rod 507 is reset by the return spring 508. The moving block 505 is wedge-shaped. A limiting groove is provided on the top of the moving block 505. An iron core 506 is provided in the limiting groove. The iron core 506 is wound with a coil. When the coil is energized, the iron core 506 attracts the bottom of the insertion rod 507. During the demoulding process, the piston rod at the end of the second cylinder 501 is controlled to drive the moving plate 502 to move in the vertical direction. When the top of the insertion rod 507 moves to the bottom of the mold 102, the servo The output end of the motor 503 drives the second screw rod 504 to rotate, so that the moving block 505 provided on the surface of the second screw rod 504 moves in the horizontal direction. The moving block 505 pushes the bottom of the insertion rod 507 during the movement, so that the insertion rod 507 moves in the vertical direction. The moving block 505 drives the insertion rod 507 to insert the sand covering the inner edge of the mold 102 in sequence during the movement, and the sand covering is scattered during the insertion process. When the iron core 506 moves to the end of the second screw rod 504, the output shaft at the end of the servo motor 503 is controlled to rotate in the opposite direction, and the coil on the surface of the iron core 506 is energized. During the return movement, the insertion rod 507 above the iron core 506 is adsorbed. During the adsorption and movement of the insertion rod 507, the tooth cone on the top of the insertion rod 507 pulls the nearby covered sand to fall. After the iron core 506 completes the reciprocating motion process, the second cylinder 501 is controlled to drive the movable plate 502 to move in the vertical direction, so that the iron core 506 repeatedly moves to drive the insertion rod 507 to demold the sand-covered casting inside the mold 102 until the covered sand loosens and falls off from the inside of the mold 102 to the surface of the support plate 407, thereby avoiding frequent knocking and demolding of the mold 102. During the rapid demolding process, the service life of the mold 102 is increased.

[0042] When in use, the first cylinder 200 is controlled to drive the frame 201 to move downward in the vertical direction, and the output end of the rotating motor 301 is controlled to rotate. The rotating motor 301 drives the main gear 302 to rotate, and the sub-gears 303 provided on both sides of the main gear 302 mesh and rotate. During the rotation process, the sub-gear 303 drives the first screw rod 304 to rotate, and the moving clamping plate 305 provided on the surface of the first screw rod 304 moves relatively to clamp and fix the top of the mold 102. The piston rod at the end of the first cylinder 200 is controlled to move in the vertical direction, thereby driving the frame 201 to move in the vertical direction, and the mold 102 can be quickly moved. 02 Clamping and lifting. When the clamping is completed, the movable clamping plate 305 drives the mold 102 to move upward in the vertical direction. At this time, the first gear rod 401 and the second gear rod 403 on both sides of the movable clamping plate 305 are in opposite movement directions. During the downward movement of the second gear rod 403, the pulling force of the pull rope on the end of the support plate 407 is gradually reduced. At this time, the push rod 405 at the end of the support plate 407 is pushed by the elastic member 406 and moves relatively. During the relative movement of the support plate 407, the casting inside the mold 102 is supported to prevent the casting from falling off and colliding on the ground to cause deformation, thereby protecting the casting;

[0043] By controlling the piston rod at the end of the second cylinder 501 to drive the moving plate 502 to move in the vertical direction, when the top of the insertion rod 507 moves to the bottom of the mold 102, the output end of the servo motor 503 drives the second screw rod 504 to rotate, so that the moving block 505 provided on the surface of the second screw rod 504 moves in the horizontal direction. The moving block 505 pushes the bottom of the insertion rod 507 during the movement, so that the insertion rod 507 moves in the vertical direction. During the movement, the moving block 505 drives the insertion rod 507 to insert the sand coating on the inner edge of the mold 102 in sequence, and the sand coating is scattered during the insertion process. When the iron core 506 moves to the end of the second screw rod 504, the output shaft at the end of the servo motor 503 is controlled to rotate in the opposite direction, and The coil on the surface of the iron core 506 is energized, so the insertion rod 507 above the iron core 506 is adsorbed during the return movement of the iron core 506. During the adsorption and movement of the insertion rod 507, the tooth cone on the top of the insertion rod 507 pulls the nearby covered sand to fall off. After the iron core 506 completes the reciprocating motion process, the second cylinder 501 is controlled to drive the moving plate 502 to move in the vertical direction, so that the iron core 506 repeatedly moves to drive the insertion rod 507 to demold the sand-covered casting inside the mold 102 until the covered sand loosens and falls off from the inside of the mold 102 to the surface of the support plate 407, thereby avoiding frequent knocking and demolding of the mold 102. During the rapid demolding process, the service life of the mold 102 is increased.

[0044] The second object of the present invention is to provide a transformer coil shaping method, comprising any one of the above-mentioned iron mold sand-covered casting demoulding devices, comprising the following steps:

[0045] S1. Control the first cylinder 200 to drive the frame plate 201 to move downward in the vertical direction, control the clamping assembly 300 to clamp and fix the top of the mold 102, and control the piston rod at the end of the first cylinder 200 to move in the vertical direction, thereby driving the frame plate 201 to move in the vertical direction, and quickly clamping and lifting the mold 102;

[0046] S2. When the clamping assembly 300 is driven to move upward in the vertical direction by the frame plate 201, the protection assembly 400 moves relatively, and during the relative movement, the casting inside the mold 102 is supported to prevent the casting from falling off and hitting the ground to cause deformation, thereby protecting the casting;

[0047] S3. The sand-coated casting inside the raised mold 102 is quickly demolded by the automatic demolding assembly 500, thereby increasing the service life of the mold 102.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A casting demoulding device with sand-coated iron mold, characterized in that: The invention comprises a movable frame (100), wherein a movable frame (101) is provided at the bottom of the movable frame (100), a mold (102) is provided below the movable frame (101), a first cylinder (200) is provided at the bottom of the movable frame (101), a frame plate (201) is provided at the end of a piston rod of the first cylinder (200), limiting rods (202) are provided at the four corners of the movable frame (101) and the frame plate (201), a clamping assembly (300) is provided at the bottom of the frame plate (201), and the clamping assembly (300) is provided at the bottom of the frame plate (201). The component (300) is used to clamp and fix the mold (102). A protection component (400) is provided below the clamping component (300). The protection component (400) protects the internal casting of the mold (102) that is clamped and lifted to a high altitude, so as to prevent the casting from falling to the ground and being deformed due to collision during the lifting process. An automatic demoulding component (500) is provided on the surface of the protection component (400). The automatic demoulding component (500) is used to demould the casting attached to the inside of the mold (102).

2. The demoulding device for castings covered with sand in an iron mold according to claim 1, characterized in that: The clamping assembly (300) comprises a rotating motor (301) arranged on the surface of a frame plate (201); the output end of the rotating motor (301) passes through the frame plate (201) and is provided with a main gear (302) at the end; sub-gears (303) are provided on both sides of the main gear (302); the sub-gears (303) mesh and rotate on both sides of the main gear (302); a first screw rod (304) is provided at the end of the sub-gear (303); a movable clamping plate (305) is provided on the surface of the first screw rod (304); when the first screw rod (304) rotates, the movable clamping plate (305) is driven to move relative to the first screw rod (304).

3. The demoulding device for castings covered with sand in an iron mold according to claim 2, characterized in that: The protection assembly (400) comprises a first gear rod (401) arranged on both sides of the frame plate (201), a second gear rod (403) is slidably arranged on both sides of the inner wall of the movable frame (101), a rotating gear (402) is arranged between the first gear rod (401) and the second gear rod (403), a support plate (407) is arranged below the second gear rod (403), a groove block is arranged at the end of the support plate (407), a wire winding groove (409) is arranged at the top of the groove block, and a pull rope is arranged between the second gear rod (403) and the groove block.

4. The casting demoulding device of the iron mold covered with sand according to claim 1 is characterized in that: The movable frame (101) is provided with a column tube (404) on both sides of the bottom, and a push rod (405) is slidably provided on the inner wall of the column tube (404). The push rod (405) is fixed at the end of the support plate (407), and an elastic member (406) is provided between the column tube (404) and the push rod (405).

5. The demoulding device for castings covered with sand in an iron mold according to claim 4, characterized in that: Fixed pulleys (408) are provided on both sides of the moving frame (101), and the pull rope is attached to the bottom of the fixed pulley (408) and is parallel to the push rod (405).

6. The demoulding device for castings covered with sand in an iron mold according to claim 1, characterized in that: The automatic demoulding component (500) comprises a second cylinder (501) provided at the bottom of a support plate (407), a movable plate (502) provided at the end of a piston rod at the end of the second cylinder (501), a servo motor (503) provided on the outer wall of the movable plate (502), a second screw rod (504) provided at the output end of the servo motor (503), and a movable block (505) provided on the surface of the second screw rod (504).

7. The demoulding device for castings covered with sand in an iron mold according to claim 6, characterized in that: A fixed groove block is provided above the movable plate (502), and an insertion rod (507) is slidably provided in the fixed groove block. The top of the insertion rod (507) is cone-shaped, and a tooth cone is provided near the top of the insertion rod (507). The tooth cone forms an angle of 30° with the vertical direction. A reset spring (508) is provided between the insertion rod (507) and the fixed groove block to push the insertion rod (507) to move up in the vertical direction. The insertion rod (507) is made of iron. When there is no external force, the insertion rod (507) is reset by the force of the reset spring (508).

8. The demoulding device for castings covered with sand in an iron mold according to claim 7, characterized in that: The moving block (505) is wedge-shaped, and a limiting groove is provided on the top of the moving block (505). An iron core (506) is arranged in the limiting groove. A coil is wound around the iron core (506). When the coil is energized, the iron core (506) attracts the bottom of the insertion rod (507).

9. A method for demoulding a casting coated with sand in an iron mold, comprising the demoulding device for a casting coated with sand in an iron mold according to any one of claims 1 to 8, characterized in that: The steps include: S1. Controlling the first cylinder (200) to drive the frame plate (201) to move downward in the vertical direction, controlling the clamping assembly (300) to clamp and fix the top of the mold (102), and controlling the piston rod at the end of the first cylinder (200) to move in the vertical direction, thereby driving the frame plate (201) to move in the vertical direction, and quickly clamping and lifting the mold (102); S2, when the clamping assembly (300) is driven to move upward in the vertical direction by the frame plate (201), the protection assembly (400) moves relatively, and during the relative movement, the casting inside the mold (102) is supported to prevent the casting from falling off and hitting the ground to cause deformation, thereby protecting the casting; S3. The sand-coated casting inside the raised mold (102) is quickly demoulded by an automatic demoulding assembly (500), thereby increasing the service life of the mold (102).

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