Casting method of engine cylinder block casting

Abstract

The invention belongs to the technical field of casting, and particularly relates to a casting method of an engine cylinder block casting, which comprises the following steps: step 1, when a motor is started, the output end of the motor drives a threaded rod to rotate, and an internal threaded sleeve is in threaded connection with the threaded rod under the guide action of a guide rod; the internal threaded sleeve drives the detection plate to linearly move in the rotating process of the threaded rod; whether a gap is formed in the gap between the fixed mold and the movable mold or not is detected through resetting of the detection plate, and if the gap is formed in the gap between the fixed mold and the movable mold and the cavity is communicated with the external environment, the high-temperature-resistant film deforms through resetting of the detection plate to form a shape similar to an inverted cone; and the abutting plate abuts against the high-temperature-resistant film through movement of the contraction plate, the abutting plate elastically compresses the contraction spring and contracts in the contraction plate till the first contact abuts against the second contact, the buzzer makes a sound, and then a gap is generated at the gap between the fixed mold and the movable mold.

Description

Technical Field

[0001] The invention belongs to the technical field of casting, in particular to a casting method for an engine cylinder casting. Background Art

[0002] Engine block casting is one of the important components of the engine, which is usually formed by die casting.

[0003] In the prior art, during casting, the fixed mold and the movable mold are first preheated, and then a release agent is sprayed on the fixed mold and the movable mold. After drying, the fixed mold and the movable mold are closed to make them fit tightly and make the enclosed space inside them become a cavity. The cavity is then evacuated through a vacuum valve, and molten metal is injected into the cavity. After it cools and solidifies, the mold is opened, and the solidified metal solid is taken out from the fixed mold to obtain a cylinder casting.

[0004] The existing technology still has some shortcomings in actual use. During long-term casting operations, the contact interface between the fixed mold and the movable mold will cause progressive loss of mold surface material due to continuous high-frequency friction. This material loss will reduce the fit of the contact surface when the mold is closed, forming a tiny gap, which will eventually cause the gap to connect the mold cavity with the external environment. During vacuum treatment, since the air pressure always goes from low to high, external air will continue to penetrate into the cavity through the gap, destroying the vacuum environment, resulting in the problem of pores after the metal liquid in the cavity cools down due to gas mixing when the metal liquid is injected.

[0005] To this end, the present invention provides a casting method for an engine cylinder block casting. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a casting method of an engine cylinder casting according to the present invention includes pretreatment, spraying a release agent, mold closing, vacuuming, liquid injection and cooling and demolding, wherein vacuuming includes the following steps:

[0008] Step 1: After the fixed mold and the movable mold are closed, the motor is started to drive the detection plate to move linearly, and the gap between the fixed mold and the movable mold is covered during the movement;

[0009] Step 2: When the detection plate moves linearly, the motor output end will drive the shrinking plate to move so that the shrinking plate does not block the detection plate from covering the gap between the fixed mold and the movable mold;

[0010] Step 3: When the vacuum pump starts working, the motor rotates in the reverse direction. Through the operations of steps 1 and 2, the detection plate and the shrink plate are reset. When a gap is generated between the fixed mold and the movable mold, the cavity is connected to the external environment. During the process of resetting the shrink plate, contact 1 will abut against contact 2, and the buzzer will sound.

[0011] Step 4: When contact 1 and contact 2 are in contact, the electric telescopic rod 2 will extend, thereby pushing the sealing plate 1 into the shrinkage groove 2, isolating the gap between the fixed mold and the movable mold, and spraying the release agent in a mist form on one side of the inside of the cavity of the sealing plate 1 through the spray head.

[0012] Preferably, in step one, when the motor is started, its output end drives the threaded rod to rotate, and under the threaded connection between the internal threaded sleeve and the threaded rod and the guiding action of the guide rod, the internal threaded sleeve drives the detection plate to move linearly during the rotation of the threaded rod.

[0013] Preferably, since the guide rod and the telescopic cylinder are sleeved, one end of the guide rod is fixed on the inner surface of the mouth-shaped plate, so that the detection plate only moves in a straight line. Therefore, during the rotation of the threaded rod, the internal threaded sleeve will not rotate synchronously with the threaded rod, causing the detection plate to move in a straight line until the detection plate covers the gap between the fixed mold and the movable mold, and then the motor is turned off.

[0014] Preferably, in step 2, when the output end of the motor drives the threaded rod to rotate, the gear rod is driven to rotate through the transmission of the belt, so that the rack only moves linearly in the guide groove 1, thereby causing the retractable plate to move linearly through the connecting rod.

[0015] Preferably, when the two sets of connecting rods move linearly in the same direction, they will synchronously drive the shrinkage plate to move linearly, so that the shrinkage plate maintains stable linear motion while the shrinkage plate and the abutment plate on it do not block the high-temperature resistant film on the detection plate covering the gap between the fixed mold and the movable mold.

[0016] Preferably, in step three, when a gap is generated at the gap between the fixed mold and the movable mold, so that the cavity is connected to the external environment, the detection plate is reset, and the high-temperature resistant film on the detection plate partially blocks the gap, so that the inside of the cavity remains vacuum, and the remaining part is reset, so that the high-temperature resistant film is deformed to form a shape similar to an inverted cone.

[0017] Preferably, during the resetting process of the retractable plate, the retractable plate moves to make the abutting plate abut against the high temperature resistant film, so that the abutting plate elastically compresses the retractable spring and shrinks inside the retractable plate until contact one abuts contact two and the buzzer makes a sound.

[0018] Preferably, in step four, when contact one abuts contact two, the electric telescopic rod two contracts first, causing the sealing plate one to contract into the contraction groove one, and the sealing plate one pushes the guide plate to move in the same direction, so that the guide plate drives the piston rod to move and elastically compresses the return spring, filling the rectangular piston cylinder with a release agent.

[0019] Preferably, the electric telescopic rod 2 contracts and then begins to extend, so that the sealing plate 1 no longer pushes the guide plate to move, and the piston rod is reset through the elastic release of the reset spring. When the sealing plate 1 moves above the spray head, the spray head sprays the release agent in a mist form on the side of the sealing plate 1 close to the inside of the cavity.

[0020] Preferably, after spraying the release agent, the sealing plate 1 continues to move. During this process, the sealing plate 1 is inserted into the shrinkage groove 2 and pushes the sealing plate 2 to elastically compress the compression spring, thereby isolating the gap generated at the gap between the fixed mold and the movable mold.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The present invention detects whether a gap is generated in the gap between the fixed mold and the movable mold by resetting the detection plate. If a gap is generated in the gap between the fixed mold and the movable mold, causing the cavity to be connected to the external environment, the high-temperature resistant film is deformed by resetting the detection plate to form a shape similar to an inverted cone, and the abutment plate is moved to abut against the high-temperature resistant film, so that the abutment plate elastically compresses the contraction spring and contracts inside the contraction plate until contact one abuts contact two, and a buzzer sounds, thereby raising the gap generated in the gap between the fixed mold and the movable mold.

[0023] 2. The present invention contracts the electric telescopic rod 2, and the sealing plate 1 pushes the guide plate to move in the same direction, so that the guide plate drives the piston rod to move and elastically compresses the return spring, and fills the rectangular piston cylinder with a release agent. When the electric telescopic rod 2 is extended, the sealing plate 1 moves, and the release agent is sprayed in a mist form on the side of the sealing plate 1 close to the inside of the cavity through the spray head to prevent the molten metal from adhering to it after cooling and solidification, resulting in damage to the casting surface during separation, thereby ensuring the performance of the casting during demolding. After spraying the release agent, the sealing plate 1 is inserted into the shrinkage groove 2, and pushes the sealing plate 2 to elastically compress the compression spring, thereby isolating the gap generated at the gap between the fixed mold and the movable mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic elevation diagram of the overall device of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the detection component of the present invention;

[0027] Figure 3This is a schematic diagram of the positional relationship between the mouth-shaped plate and the fixed mold of the present invention;

[0028] Figure 4 This is a schematic diagram of the positional relationship between the mouth-shaped plate and the guide rod of the present invention;

[0029] Figure 5 This is a schematic diagram of the positional relationship between the guide rod and the telescopic cylinder of the present invention;

[0030] Figure 6 This is a schematic diagram of the positional relationship between the retractable plate and the buzzer of the present invention;

[0031] Figure 7 For the present invention Figure 6 A in the middle is an enlarged schematic diagram;

[0032] Figure 8 This is a schematic diagram of the positional relationship between the sealing plate 2 and the compression spring of the present invention;

[0033] Figure 9 This is a schematic diagram of the positional relationship between the workbench and the electric telescopic rod of the present invention;

[0034] Figure 10 This is a schematic diagram of the positional relationship between the second electric telescopic rod and the first sealing plate of the present invention;

[0035] Figure 11 This is a schematic diagram of the positional relationship between the movable mold and the liquid storage tank of the present invention;

[0036] Figure 12 This is a schematic diagram of the positional relationship between the rectangular piston cylinder and the infusion tube of the present invention;

[0037] Figure 13 For the present invention Figure 12 Enlarged schematic diagram of point B in the middle.

[0038] Reference numerals: 1, workbench; 11, fixed mold; 12, electric telescopic rod 1; 13, movable mold; 14, vacuum pump;

[0039] 21. Mouth-shaped plate; 22. Support frame; 23. Motor; 24. Guide rod; 25. Telescopic cylinder; 26. Detection plate; 27. Internally threaded sleeve; 28. Threaded rod; 29. Guide groove 1; 210. Gear rod; 211. Belt; 212. Rack; 213. Connecting rod; 214. Retractable plate; 215. Abutment plate; 216. Retractable spring; 217. Contact 1; 218. Contact 2; 219. Buzzer;

[0040] 31. Contraction groove 1; 32. Electric telescopic rod 2; 33. Sealing plate 1; 34. Spray head; 35. Guide groove 2; 36. Rectangular piston cylinder; 37. Piston rod; 38. Return spring; 39. Guide plate; 310. Infusion tube; 311. Liquid storage tank; 312. Liquid inlet tube; 313. Contraction groove 2; 314. Sealing plate 2; 315. Compression spring. DETAILED DESCRIPTION

[0041] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0042] Example 1

[0043] like Figures 1 to 13 As shown, a casting method of an engine cylinder casting according to an embodiment of the present invention includes pretreatment, spraying a release agent, mold closing, vacuuming, liquid injection, and cooling and demolding. The vacuuming includes the following steps:

[0044] Step 1: After the fixed mold 11 and the movable mold 13 are closed, the motor 23 is started to drive the detection plate 26 to move linearly, and the gap between the fixed mold 11 and the movable mold 13 is covered during the movement;

[0045] Step 2: When the detection plate 26 performs linear motion, the output end of the motor 23 drives the shrinking plate 214 to move so that the shrinking plate 214 does not block the detection plate 26 from covering the gap between the fixed mold 11 and the movable mold 13;

[0046] Step 3: When the vacuum pump 14 starts working, the motor 23 rotates in the reverse direction. Through the operations of steps 1 and 2, the detection plate 26 and the shrinking plate 214 are reset. When a gap is generated between the fixed mold 11 and the movable mold 13, the cavity is connected to the external environment. During the resetting process of the shrinking plate 214, the contact 1 217 will abut against the contact 2 218, and the buzzer 219 will sound.

[0047] Step 4: When contact 1 217 and contact 2 218 abut, the electric telescopic rod 2 32 will extend, thereby pushing the sealing plate 1 33 into the shrinkage groove 2 313, isolating the gap between the fixed mold 11 and the movable mold 13, and spraying the release agent in a mist form on one side of the inner cavity of the sealing plate 1 33 through the spray head 34.

[0048] Example 2

[0049] like Figures 2 to 13 As shown, compared with Example 1, another embodiment of the present invention is:

[0050] like Figures 2 to 5As shown, in step 1 of this embodiment, when the motor 23 is started, its output end drives the threaded rod 28 to rotate. Under the threaded connection between the internally threaded sleeve 27 and the threaded rod 28 and the guidance of the guide rod 24, the internally threaded sleeve 27 drives the detection plate 26 to move linearly during the rotation of the threaded rod 28;

[0051] Since the guide rod 24 and the telescopic cylinder 25 are sleeved, one end of the guide rod 24 is fixed to the inner surface of the mouth-shaped plate 21, so that the detection plate 26 only moves in a straight line. Therefore, during the rotation of the threaded rod 28, the internal threaded sleeve 27 will not rotate synchronously with the threaded rod 28, so that the detection plate 26 moves in a straight line until the detection plate 26 covers the gap between the fixed mold 11 and the movable mold 13, and then the motor 23 is turned off.

[0052] Specifically, there are four groups of detection components, each group of detection components includes a motor 23 and a detection plate 26, and each gap between the fixed mold 11 and the movable mold 13 is provided with a group of detection components;

[0053] After the fixed mold 11 and the movable mold 13 are closed, the motor 23 is started so that its output shaft drives the threaded rod 28 to rotate synchronously. Under the guidance of the guide rod 24, the internal threaded sleeve 27 drives the detection plate 26 to move linearly away from the motor 23 during the rotation of the threaded rod 28 until the high-temperature resistant film on the detection plate 26 covers the gap between the fixed mold 11 and the movable mold 13.

[0054] like Figure 3 、 Figure 4 、 Figure 6 and Figure 7 As shown, in step 2 of this embodiment, when the output end of the motor 23 drives the threaded rod 28 to rotate, the gear rod 210 is driven to rotate through the transmission of the belt 211, so that the rack 212 only moves linearly in the guide groove 1 29, thereby causing the retractable plate 214 to move linearly through the connecting rod 213;

[0055] When the two sets of connecting rods 213 move linearly in the same direction, they will synchronously drive the shrinkage plate 214 to move linearly, so that the shrinkage plate 214 maintains stable linear motion while preventing the shrinkage plate 214 and the abutment plate 215 thereon from blocking the high-temperature resistant film on the detection plate 26 covering the gap between the fixed mold 11 and the movable mold 13.

[0056] Specifically, while the detection plate 26 moves, the rotation of the threaded rod 28 drives the gear rod 210 to rotate through the transmission of the belt 211, so that the rack 212 moves, thereby driving the shrinkage plate 214 to move through the connecting rod 213, so that the shrinkage plate 214 and the abutment plate 215 thereon do not block the detection plate 26 and the high-temperature resistant film on the detection plate 26 from covering the gap between the fixed mold 11 and the movable mold 13.

[0057] like Figure 2 、 Figure 3 、 Figure 5 、 Figure 8 and Figure 9 As shown, in step three of this embodiment, when a gap is generated at the gap between the fixed mold 11 and the movable mold 13, so that the cavity is connected to the external environment, the detection plate 26 is reset, and the high-temperature resistant film on the detection plate 26 partially blocks the gap, so that the interior of the cavity remains vacuum, and the remaining part is reset, so that the high-temperature resistant film is deformed to form a shape similar to an inverted cone;

[0058] During the resetting process of the retraction plate 214, the retraction plate 214 moves to make the abutment plate 215 abut against the high temperature resistant film, so that the abutment plate 215 elastically compresses the retraction spring 216 and retracts inside the retraction plate 214 until the contact 1 217 abuts against the contact 2 218, and the buzzer 219 makes a sound.

[0059] Specifically, because air pressure always increases from low to high, when a gap appears at the joint of the mold clamping die, connecting the cavity to the outside, the outside air flows into the cavity under the action of air pressure. Because the high-temperature resistant film adheres to the joint and the film is flexible, and at the same time, the four sides of the high-temperature resistant film are fixed to the four sides of the detection plate 26, and the rest of the film adheres to the detection plate 26, the film partially enters the gap and seals it, so that the cavity remains a closed space;

[0060] The detection assembly further includes a retraction plate 214 and an abutment plate 215. The abutment plate 215 on each set of detection assemblies is initially located above the gap between the fixed mold 11 and the movable mold 13.

[0061] At this time, the driving motor 23 rotates in the opposite direction. Through the above operation, the detection plate 26 is reset. When a gap is generated at the gap between the fixed mold 11 and the movable mold 13, so that the cavity is connected to the external environment, the detection plate 26 is reset. The high-temperature resistant film on the detection plate 26 partially blocks the gap, so that the inside of the cavity remains vacuum. The remaining part is reset, so that the high-temperature resistant film is deformed to form a shape similar to an inverted cone.

[0062] During the retraction process of the retraction plate 214, the retraction plate 214 moves to make the contact plate 215 contact the high temperature resistant film, so that the contact plate 215 elastically compresses the retraction spring 216 and retracts inside the retraction plate 214 until the first contact 217 contacts the second contact 218, and the buzzer 219 sounds.

[0063] The present invention detects whether a gap is generated in the gap between the fixed mold 11 and the movable mold 13 by resetting the detection plate 26. If a gap is generated in the gap between the fixed mold 11 and the movable mold 13, so that the cavity is connected to the external environment, the high-temperature resistant film is deformed by resetting the detection plate 26 to form a shape similar to an inverted cone, and the abutment plate 215 is moved to abut against the high-temperature resistant film by the contraction plate 214, so that the abutment plate 215 elastically compresses the contraction spring 216 and contracts in the contraction plate 214 until the contact 1 217 abuts against the contact 2 218, and the buzzer 219 makes a sound, thereby generating a gap in the gap between the fixed mold 11 and the movable mold 13.

[0064] like Figures 8 to 13 As shown, in step 4 of this embodiment, when contact 1 217 abuts contact 2 218 , electric telescopic rod 2 32 contracts first, causing sealing plate 1 33 to contract into contraction groove 1 31 , and sealing plate 1 33 pushes guide plate 39 to move in the same direction, causing guide plate 39 to drive piston rod 37 to move and elastically compress return spring 38, thereby filling the rectangular piston cylinder 36 with release agent.

[0065] After the electric telescopic rod 2 32 contracts, it begins to extend, so that the sealing plate 1 33 no longer pushes the guide plate 39 to move. The return spring 38 is elastically released, causing the piston rod 37 to return to its original position. When the sealing plate 1 33 moves above the spray head 34, the spray head 34 sprays the release agent in the form of a mist on the side of the sealing plate 1 33 close to the inside of the cavity.

[0066] After spraying the release agent, the sealing plate 1 33 continues to move. During this process, the sealing plate 1 33 is inserted into the shrinkage groove 2 313 and pushes the sealing plate 2 314 to elastically compress the compression spring 315, thereby isolating the gap generated at the gap between the fixed mold 11 and the movable mold 13.

[0067] Specifically, there are four groups of sealing components, and the sealing component detection components correspond one to one. Each group of sealing components includes an electric telescopic rod 2 32, a sealing plate 1 33, a rectangular piston cylinder 36 and a sealing plate 2 314;

[0068] At the same time as the contact 1 217 and the contact 2 218 abut, the electric telescopic rod 2 32 contracts first, causing the sealing plate 1 33 to contract into the contraction groove 1 31, and the sealing plate 1 33 pushes the guide plate 39 to move in the same direction, so that the guide plate 39 drives the piston rod 37 to move and elastically compresses the return spring 38, filling the rectangular piston cylinder 36 with the release agent, and then the electric telescopic rod 2 32 extends, and the return spring 38 is elastically released to reset the piston rod 37. When the sealing plate 1 33 moves above the spray head 34, the spray head 34 sprays the release agent in the form of a mist on the side of the sealing plate 1 33 close to the inside of the cavity, preventing the molten metal from adhering to it after cooling and solidification, causing damage to the casting surface during separation, thereby ensuring the performance of the casting during demolding;

[0069] After spraying the release agent, the sealing plate 1 33 continues to move. During this process, the sealing plate 1 33 is inserted into the shrinkage groove 2 313 and pushes the sealing plate 2 314 to elastically compress the compression spring 315, thereby isolating the gap generated at the gap between the fixed mold 11 and the movable mold 13.

[0070] The present invention contracts the electric telescopic rod 2 32, and the sealing plate 1 33 pushes the guide plate 39 to move in the same direction, so that the guide plate 39 drives the piston rod 37 to move and elastically compresses the return spring 38, and fills the rectangular piston cylinder 36 with a release agent. When the electric telescopic rod 2 32 is extended, the sealing plate 1 33 moves, and the release agent is sprayed in a mist form on the side of the sealing plate 1 33 close to the inside of the cavity through the spray head 34 to prevent the metal liquid from adhering to it after cooling and solidification, resulting in damage to the casting surface during separation, thereby ensuring the performance of the casting during demolding. After spraying the release agent, the sealing plate 1 33 is inserted into the shrinkage groove 2 313, and pushes the sealing plate 2 314 to elastically compress the compression spring 315, thereby isolating the gap generated at the gap between the fixed mold 11 and the movable mold 13.

[0071] Working principle:

[0072] Before the vacuum operation, after the fixed mold 11 and the movable mold 13 are closed, the motor 23 is started so that its output shaft drives the threaded rod 28 to rotate synchronously. Under the guidance of the guide rod 24, the internally threaded sleeve 27 drives the detection plate 26 to move linearly away from the motor 23 during the rotation of the threaded rod 28 until the high-temperature resistant film on the detection plate 26 abuts the gap between the fixed mold 11 and the movable mold 13;

[0073] As the detection plate 26 moves, the rotation of the threaded rod 28 drives the gear rod 210 to rotate through the transmission of the belt 211, so that the rack 212 moves, thereby driving the shrinking plate 214 to move through the connecting rod 213, so that the shrinking plate 214 and the abutting plate 215 on it do not block the detection plate 26 and the high-temperature resistant film on the detection plate 26 from covering the gap between the fixed mold 11 and the movable mold 13;

[0074] At this time, the cavity formed after the mold is closed is evacuated by the vacuum pump 14, and then the motor 23 is driven to rotate in the opposite direction. Through the above operation, the detection plate 26 is reset. When a gap is generated at the gap between the fixed mold 11 and the movable mold 13, so that the cavity is connected to the external environment, the detection plate 26 is reset, and the high-temperature resistant film on the detection plate 26 partially blocks the gap, so that the inside of the cavity remains vacuum, and the remaining part is reset, so that the high-temperature resistant film is deformed to form a shape similar to an inverted cone;

[0075] During the retraction process of the retraction plate 214, the retraction plate 214 moves to make the contact plate 215 contact the high temperature resistant film, so that the contact plate 215 elastically compresses the retraction spring 216 and retracts inside the retraction plate 214 until the first contact 217 contacts the second contact 218, and the buzzer 219 sounds.

[0076] At the same time as the contact 1 217 and the contact 2 218 abut, the electric telescopic rod 2 32 contracts first, causing the sealing plate 1 33 to contract into the contraction groove 1 31, and the sealing plate 1 33 pushes the guide plate 39 to move in the same direction, so that the guide plate 39 drives the piston rod 37 to move and elastically compresses the return spring 38, filling the rectangular piston cylinder 36 with the release agent, and then the electric telescopic rod 2 32 extends, and the return spring 38 is elastically released to reset the piston rod 37. When the sealing plate 1 33 moves above the spray head 34, the spray head 34 sprays the release agent in the form of a mist on the side of the sealing plate 1 33 close to the inside of the cavity, preventing the molten metal from adhering to it after cooling and solidification, causing damage to the casting surface during separation, thereby ensuring the performance of the casting during demolding;

[0077] After spraying the release agent, the sealing plate 1 33 continues to move. During this process, the sealing plate 1 33 is inserted into the shrinkage groove 2 313 and pushes the sealing plate 2 314 to elastically compress the compression spring 315, thereby isolating the gap generated at the gap between the fixed mold 11 and the movable mold 13.

[0078] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A casting method for an engine cylinder casting, which requires vacuum treatment during the casting process, characterized in that: The following steps are involved: Step 1: After the fixed mold (11) and the movable mold (13) are closed, the motor (23) is started to drive the detection plate (26) to move linearly, and the gap between the fixed mold (11) and the movable mold (13) is covered during the movement; Step 2: When the detection plate (26) performs linear motion, the output end of the motor (23) drives the shrinkage plate (214) to move, so that the shrinkage plate (214) does not block the detection plate (26) from covering the gap between the fixed mold (11) and the movable mold (13); Step 3: When the vacuum pump (14) starts working, the motor (23) rotates in the reverse direction. Through the operation of step 1 and step 2, the detection plate (26) and the shrinking plate (214) are reset. When a gap is generated at the gap between the fixed mold (11) and the movable mold (13), the cavity is connected to the external environment. During the resetting process of the shrinking plate (214), the contact 1 (217) will abut against the contact 2 (218), and the buzzer (219) will sound. Step 4: When contact 1 (217) and contact 2 (218) are in contact, electric telescopic rod 2 (32) will extend, thereby pushing sealing plate 1 (33) into shrinkage groove 2 (313), isolating the gap between the fixed mold (11) and the movable mold (13), and spraying the release agent in the form of mist on one side of the cavity of sealing plate 1 (33) through the spray head (34).

2. The method for casting an engine cylinder block casting according to claim 1, characterized in that: In step 1, when the motor (23) is started, its output end drives the threaded rod (28) to rotate, and under the threaded connection between the internal threaded sleeve (27) and the threaded rod (28) and the guiding action of the guide rod (24), the internal threaded sleeve (27) drives the detection plate (26) to move linearly during the rotation of the threaded rod (28).

3. The method for casting an engine cylinder block casting according to claim 2, characterized in that: Since the guide rod (24) and the telescopic cylinder (25) are sleeved, one end of the guide rod (24) is fixed to the inner surface of the mouth-shaped plate (21), so that the detection plate (26) only moves in a straight line. Therefore, during the rotation of the threaded rod (28), the internal threaded sleeve (27) does not rotate synchronously with the threaded rod (28), so that the detection plate (26) moves in a straight line until the detection plate (26) covers the gap between the fixed mold (11) and the movable mold (13), and then the motor (23) is turned off.

4. The method for casting an engine cylinder block casting according to claim 1, characterized in that: In step 2, when the output end of the motor (23) drives the threaded rod (28) to rotate, the gear rod (210) is driven to rotate through the transmission of the belt (211), so that the rack (212) only moves linearly in the guide groove (29), thereby causing the contraction plate (214) to move linearly through the connecting rod (213).

5. The method for casting an engine cylinder block casting according to claim 4, characterized in that: When the two sets of connecting rods (213) move linearly in the same direction, they will synchronously drive the shrinkage plate (214) to move linearly, so that the shrinkage plate (214) maintains stable linear motion while the shrinkage plate (214) and the abutting plate (215) thereon do not block the high-temperature resistant film on the detection plate (26) from covering the gap between the fixed mold (11) and the movable mold (13).

6. The method for casting an engine cylinder block casting according to claim 1, characterized in that: In step three, when a gap is generated at the gap between the fixed mold (11) and the movable mold (13), so that the cavity is connected to the external environment, the detection plate (26) is reset, and the high-temperature resistant film on the detection plate (26) partially blocks the gap, so that the inside of the cavity remains vacuum, and the remaining part is reset, so that the high-temperature resistant film is deformed to form a shape similar to an inverted cone.

7. The method for casting an engine cylinder block casting according to claim 6, characterized in that: During the resetting process of the shrinking plate (214), the shrinking plate (214) moves to cause the contact plate (215) to contact the high-temperature resistant film, so that the contact plate (215) elastically compresses the shrinking spring (216) and shrinks inside the shrinking plate (214) until the first contact (217) and the second contact (218) contact each other, and the buzzer (219) emits a sound.

8. The method for casting an engine cylinder block casting according to claim 1, characterized in that: In step 4, when contact 1 (217) and contact 2 (218) are in contact, electric telescopic rod 2 (32) is first contracted, causing sealing plate 1 (33) to contract into contraction groove 1 (31), and sealing plate 1 (33) pushes guide plate (39) to move in the same direction, causing guide plate (39) to drive piston rod (37) to move and elastically compress return spring (38), thereby filling release agent into rectangular piston cylinder (36).

9. The method for casting an engine cylinder block casting according to claim 8, characterized in that: After the electric telescopic rod 2 (32) contracts, it begins to stretch, so that the sealing plate 1 (33) no longer pushes the guide plate (39) to move, and the piston rod (37) is reset by the elastic release of the return spring (38). When the sealing plate 1 (33) moves above the spray head (34), the spray head (34) sprays the release agent in the form of mist on the side of the sealing plate 1 (33) close to the inside of the cavity.

10. The method for casting an engine cylinder block casting according to claim 9, characterized in that: After the release agent is sprayed, the sealing plate 1 (33) continues to move. During this process, the sealing plate 1 (33) is inserted into the shrinkage groove 2 (313) and pushes the sealing plate 2 (314) to elastically compress the compression spring (315), thereby isolating the gap generated at the gap between the fixed mold (11) and the movable mold (13).

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