Three-plate mechanical core-pulling mold

Abstract

The invention relates to the technical field of plastic forming molds, in particular to a three-plate mechanical core-pulling mold which comprises a fixed mold seat plate, a fixed mold and a movable mold seat plate, an inclined guide column is arranged on the fixed mold, an ejector rod is arranged on the movable mold seat plate, the three-plate mechanical core-pulling mold further comprises a movable mold, an air bag, a telescopic column and an air storage cavity allowing the ejector rod to penetrate through are arranged on the movable mold, and the air bag and the telescopic column are both communicated with the air storage cavity. The telescopic column is obliquely arranged on the movable mold, a strip-shaped groove is formed in the ejector rod, and the strip-shaped groove is used for releasing pressure in the air storage cavity after the movable mold is moved out; the side sliding core is slidably arranged on the movable mold and used for extruding the air bag, a guide groove matched with the inclined guide column is formed in the side sliding core, and the guide groove is used for driving the side sliding core to be away from the mold core when the fixed mold and the movable mold are opened; the lifting assembly comprises a cylinder sleeve and a piston rod, the cylinder sleeve is arranged on the movable mold and communicated with the air storage cavity, the piston rod is movably arranged on the cylinder sleeve, and a supporting plate is arranged on the piston rod. The production cycle can be shortened, and the situation that the workpiece is damaged due to the too large distance during demolding and falling is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of plastic molding molds, and in particular to a three-plate mechanical core-pulling mold. Background Art

[0002] The three-plate mechanical core-pulling mold is a special mold structure, which is particularly suitable for the production of plastic products that require lateral core pulling or have complex shapes. The three-plate mechanical core-pulling mold is mainly composed of a movable mold plate, a fixed mold plate and an intermediate plate (or pad plate, movable mold middle plate). The movable mold plate is used to fix the core, the fixed mold plate is used to fix the cavity, and the intermediate plate plays a role of connection and support. This mold structure realizes lateral core pulling by mechanical means, so that plastic products with complex structures such as side holes and side concave can be produced.

[0003] During the mold operation process, the movement mode of the movable mold directly affects the demoulding efficiency and finished product quality of the product, which can be specifically divided into vertical movement (up and down movement) and horizontal movement (left and right movement).

[0004] When moving vertically, the movable mold opens and closes the mold by moving up and down. After the injection molding or pressing process, the molded material (i.e., the product) is often difficult to fall off the mold automatically. This usually requires additional steps, such as manual operation or the introduction of a robot to assist in removing the material. This not only increases the labor cost on the production line, but also significantly extends the processing cycle of a single product, thereby reducing the overall production efficiency and capacity. When moving horizontally, although it can solve the problem of automatic unloading of materials to a certain extent, the workpiece after demolding lacks an effective support and lifting mechanism, which causes the workpiece to fall freely under the action of gravity. It may be deformed, expanded, or even damaged due to impact or collision with surrounding objects. This damage is particularly serious for those workpieces with high requirements for shape accuracy and surface quality. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a three-plate mechanical core-pulling mold, which can effectively solve the problems in the prior art that the workpiece is difficult to remove during demoulding and the workpiece is easily damaged due to lack of support when being removed.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a three-plate mechanical core-pulling mold, comprising a fixed mold base plate, a fixed mold and a movable mold base plate, wherein the fixed mold is provided with an inclined guide column, and the movable mold base plate is provided with a push rod, and further comprising: A movable mold, wherein the movable mold is provided with an air bag, a telescopic column and an air storage cavity for the ejector rod to pass through, the air bag and the telescopic column are both connected to the air storage cavity, the telescopic column is obliquely arranged on the movable mold, and the ejector rod is provided with a strip groove, which is used to release the pressure in the air storage cavity after the movable mold is moved out; A side sliding core is slidably arranged on the movable mold for extruding the airbag, and a guide groove is provided on the side sliding core to cooperate with the inclined guide column, and the guide groove is used to drive the side sliding core away from the mold core when the fixed mold and the movable mold are opened; The lifting assembly comprises a cylinder sleeve arranged on the movable mold and connected with the air storage chamber, and a piston rod movably arranged on the cylinder sleeve, wherein the piston rod is provided with a supporting plate for lifting the workpiece.

[0007] Furthermore, the side sliding core is slidably mounted on the movable mold through a slider, and a push-pull plate is provided on the slider, and the push-pull plate is used to follow the movement of the side sliding core to compress and stretch the airbag.

[0008] Furthermore, a limit piece is elastically installed on the side sliding core, and the limit piece extends into the guide groove. A movable pressure block cooperating with the limit piece is slidably installed on the side sliding core, and when the limit piece moves, the movable pressure block is driven to move toward and away from the movable mold.

[0009] Furthermore, the limit piece is Y-shaped, and a protrusion for increasing friction is provided on the side of the movable pressure block close to the movable mold. When the inclined guide column extends into the guide groove, the two groups of limit pieces are squeezed away from each other. At this time, the movable pressure block retracts into the side sliding core to cancel the extrusion with the movable mold. When the inclined guide column is completely moved out of the guide groove, the two groups of movable pressure blocks approach each other. At this time, the slider extends out of the side sliding core and squeezes the movable mold to achieve the limitation of the side sliding core.

[0010] Furthermore, the telescopic column is composed of a guide sleeve and a guide rod, the guide rod is elastically mounted on the guide sleeve, and the guide sleeve is connected to the air storage chamber. When the gas in the air storage chamber increases, the guide rod is squeezed out, and after the push rod pushes the workpiece out and the strip groove moves out of the movable mold and connects to the outside world, the gas in the air storage chamber is released, thereby retracting the guide rod on the telescopic column.

[0011] Furthermore, the piston rod is provided with a piston extending into the cylinder sleeve, and the air inlet hole on the cylinder sleeve is located at the bottom, and the lowest position of the piston is higher than the air inlet hole, and the piston is pushed up when air is taken into the cylinder sleeve.

[0012] Furthermore, the support plate is arranged on the piston rod through a bracket, and the support plate is rotatably connected to the bracket. A spring is arranged between the support plate and the bracket, and the spring is used to prevent the support plate from interfering with the fixed mold when extending between the fixed mold and the movable mold.

[0013] Furthermore, the bracket is provided with two groups of rollers distributed on both sides of the support plate, and the diameter of the rollers is larger than the diameter of the rotation axis of the support plate.

[0014] Furthermore, a sealing plate for sealing the air storage cavity is provided on the movable mold, and a sealing ring is provided at one end of the ejector rod located on the sealing plate, and the sealing ring is used to keep the air storage cavity sealed when the ejector rod moves.

[0015] Beneficial Effects Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: 1. When the fixed mold and the movable mold are opened, the inclined guide column cooperates with the guide groove to guide the two sets of side sliding cores away from each other, squeeze the air bag to inflate the air storage chamber, and move the guide rod out of the telescopic column to prevent the workpiece from being quickly ejected and damaged by collision. The gas enters the cylinder sleeve to push the piston rod to move, and then drives the bracket and the support plate to move into the gap between the fixed mold and the movable mold, and lifts the demolded workpiece. As the strip groove on the ejector rod enters the mold cavity and communicates with the outside world, the air storage chamber is depressurized to achieve the retraction of the guide rod on the telescopic column and the automatic lifting of the workpiece by the support plate to prevent the workpiece from being damaged due to excessive distance when demolding. 2. When the mold is opened for maintenance and the inclined guide pin is completely separated from the guide groove, the inclined guide pin cancels the restriction on the limit part, and pushes the limit part into the guide groove when the elastic part is reset. The movable pressure block cooperates with the limit part and moves toward the movable mold, and cooperates with the protrusion at the end of the movable pressure block to increase the friction between the movable mold and the movable mold, preventing the side sliding core from being displaced and affecting the subsequent mold closing, thereby improving the mold closing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the fixed mold of the present invention; Figure 3 It is a structural schematic diagram of the movable mold of the present invention; Figure 4 It is a partial cross-sectional schematic diagram of the fixed mold of the present invention; Figure 5 It is a half-section schematic diagram of the fixed mold of the present invention; Figure 6 It is a structural schematic diagram of the lifting assembly of the present invention; Figure 7 It is a partial cross-sectional schematic diagram of the side sliding core of the present invention; Figure 8 It is a schematic structural diagram of the side sliding core of the present invention.

[0018] Figure numerals: 1. fixed mold base plate; 2. fixed mold; 21. inclined guide column; 3. movable mold; 301. air storage chamber; 31. air bag; 32. telescopic column; 4. movable mold base plate; 41. ejector rod; 411. strip groove; 5. side sliding core; 501. guide groove; 51. limit member; 52. movable pressure block; 53. slider; 54. push-pull plate; 6. lifting assembly; 61. cylinder sleeve; 62. piston rod; 63. bracket; 64. support plate; 65. roller; 66. clockwork spring. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0020] The present invention will be further described below in conjunction with the embodiments.

[0021] Example: A three-plate mechanical core-pulling mold, see attached Figure 1-8 , including a fixed die base plate 1, a fixed die 2 and a movable die base plate 4, the fixed die base plate 1 and the fixed die 2 are connected by guide pillars, and an intermediate plate is provided between the fixed die base plate 1 and the fixed die 2, and the intermediate plate is used for the slug to fall off, and its structure is the prior art, which will not be described in detail here, the fixed die 2 is provided with an inclined guide pillar 21, the inclined guide pillar 21 is provided with two groups and is distributed in an outward eight-shaped shape, and the two groups of inclined guide pillars 21 are in the same horizontal plane, the movable die base plate 4 is provided with a push rod 41 that penetrates the movable die 3, and the push rod 41 is used to push the workpiece to separate from the movable die 3 after the mold is opened, so as to make the workpiece fall off from the molding cavity, and also includes: The movable mold 3 is provided with an airbag 31, a telescopic column 32 and an air storage chamber 301 for the ejector rod 41 to pass through. The airbag 31 is provided with two groups and corresponds to the side sliding core 5, and the airbag 31 is located on the side away from the side sliding core 5. The airbag 31 is squeezed and stretched to deform when the movable mold 3 and the fixed mold 2 are opened and closed, thereby inflating the air storage chamber 301. The airbag 31 and the telescopic column 32 are both connected to the air storage chamber 301. Since the two groups of inclined guide columns 21 are distributed in an outward-facing "X" shape, and the airbag 31 is located on the side away from the side sliding core 5, when the movable mold 3 and the fixed mold 2 are opened, the two groups of inclined guide columns 21 guide the two groups of side sliding cores 5 to move away from each other and squeeze the airbag 31 at the same time. The airbag 31 is compressed and inflates the air storage chamber 301, thereby squeezing out the telescopic column 32 to prevent collision when the workpiece is demolded.

[0022] Specifically, the telescopic column 32 is composed of a guide sleeve and a guide rod. The guide rod is elastically mounted on the guide sleeve, and the guide sleeve is connected to the air storage chamber 301. The guide rod is made of soft rubber material, which can buffer the collision with the workpiece and reduce the probability of damage to the workpiece. When the airbag 31 is pressurized, the gas is introduced into the air storage chamber 301, the gas in the air storage chamber 301 increases, and the air pressure increases. Since both ends of the air storage chamber 301 are sealed, the gas can only enter the guide sleeve, thereby pushing the guide rod on the telescopic column 32 to move out. Since the telescopic column 32 is tiltedly arranged on the movable mold 3, when the telescopic column 32 is extended, the extended end will be lower than the highest end of the workpiece. When the workpiece is extruded, the workpiece will first contact the guide rod made of soft rubber on the telescopic column 32 to prevent the workpiece from suddenly popping out and colliding with the fixed mold 2, thereby protecting the workpiece and reducing damage to the workpiece. The probability of; a strip groove 411 is provided on the push rod 41, and the strip groove 411 is used to relieve the pressure in the air storage chamber 301 after moving out of the movable mold 3. In a normal state, the top of the push rod 41 is flush with the inner wall of the molding cavity in the movable mold 3. After the workpiece is molded, the push rod 41 extends into the molding cavity and pushes the workpiece out of the molding cavity. When the push rod 41 pushes the workpiece and enters the molding cavity on the movable mold 3, the strip groove 411 set on the push rod 41 moves into the molding cavity. At this time, the gas in the air storage cavity 301 enters the molding cavity to assist the demolding of the workpiece. When the workpiece is separated from the movable mold 3, the molding cavity is connected with the outside world. At this time, the gas in the air storage cavity 301 is discharged, releasing the air pressure in the air storage cavity 301, and the guide rod on the telescopic column 32 is pulled back under the resetting action of the elastic member to prevent the guide rod from pressing against the fixed mold 2 when the mold is closed.

[0023] A side sliding core 5 is slidably arranged on the movable mold 3 for extruding the airbag 31. The side sliding core 5 is provided with two groups and distributed correspondingly to the two groups of inclined guide pillars 21. The side sliding core 5 is provided with a guide groove 501 that cooperates with the inclined guide pillar 21. The guide groove 501 is used to drive the two groups of side sliding cores 5 away from the mold core when the fixed mold 2 and the movable mold 3 are opened, and the airbag 31 is squeezed and the air storage cavity 301 is inflated. When the fixed mold 2 and the movable mold 3 are closed, the two groups of side sliding cores 5 are driven close to the mold core. At this time, the airbag 31 is stretched to extract the gas in the air storage cavity 301. At this time, the ejector rod 41 has not been reset, and the gas can enter the strip groove 411 and the air storage cavity 301 from the molding cavity.

[0024] Furthermore, the side-sliding core 5 is slidably installed on the movable mold 3 through a slider 53. The slider 53 is rectangular, which is convenient for the installation of the side-sliding core 5 and the movable mold 3. The slider 53 is installed on the movable mold 3 through a limit rod. When taking out the side-sliding core 5, the limit rod is taken out first, and then the side-sliding core 5 can be directly removed from the movable mold 3. A push-pull plate 54 is provided on the slider 53, and the push-pull plate 54 is connected to one end of the airbag 31. The push-pull plate 54 is used to follow the movement of the side-sliding core 5 to compress and stretch the airbag 31, thereby realizing the inflation and exhaust of the air storage cavity 301.

[0025] Among them, two groups of limit members 51 are elastically installed on the side sliding core 5, the two groups of limit members 51 are symmetrically distributed, and one end of the limit member 51 extends into the guide groove 501. When the inclined guide column 21 extends into the guide groove 501, the two groups of limit members 51 are squeezed away from each other. A movable pressure block 52 cooperating with the limit member 51 is slidably installed on the side sliding core 5. When the limit member 51 moves, the movable pressure block 52 is driven to move toward the direction close to the movable mold 3 and toward the direction away from the movable mold 3. The movable pressure block 52 is two-section and is connected by screws. A rectangular installation groove is opened on the side sliding core 5 to facilitate the cooperation and installation of the movable pressure block 52 and the limit member 51.

[0026] In addition, the limit piece 51 is Y-shaped, and a protrusion for increasing friction is provided on the side of the movable pressure block 52 close to the movable mold 3. Due to the special shape of the limit piece 51, when the inclined guide column 21 extends into the guide groove 501, the two groups of limit pieces 51 are squeezed away from each other. At this time, the limit piece 51 drives the movable pressure block 52 to retract into the side sliding core 5, canceling the extrusion with the movable mold 3. When the inclined guide column 21 is completely moved out of the guide groove 501, the two groups of limit pieces 51 approach each other. At this time, the movable pressure block 52 extends out of the side sliding core 5, and cooperates with the protrusion on the movable pressure block 52 to squeeze the movable mold 3, thereby realizing the limitation of the side sliding core 5.

[0027] In the above technical scheme, when the fixed mold 2 and the movable mold 3 are separated, the side sliding core 5 is moved away from each other through the cooperation of the inclined guide column 21 and the guide groove 501. When the side sliding core 5 moves away from each other, the air bag 31 is squeezed to inflate and pressurize the air storage chamber 301, and then the guide rod on the telescopic column 32 is moved out, and then the push rod 41 moves to remove the workpiece. At this time, the guide rod on the telescopic column 32 prevents the workpiece from popping out and being damaged. At the same time, the strip groove 411 on the push rod 41 enters the mold cavity on the movable mold 3 to discharge the gas in the air storage chamber 301. The guide rod on the telescopic column 32 retracts under the action of the resetting of the elastic member to prevent interference with the fixed mold 2 during mold closing. On the other hand, after the inclined guide column 21 is disengaged from the guide groove 501, the limit member 51 extends into the guide groove 501 under the resetting action of the elastic member, and at this time drives the movable pressing block 52 to move toward the movable mold 3, and then cooperates with the protrusion set on the movable pressing block 52 to limit the movement of the side sliding core 5 and improve the mold closing accuracy.

[0028] The lifting assembly 6 includes a cylinder sleeve 61 arranged on the movable mold 3 and connected to the air storage chamber 301, a piston rod 62 movably arranged on the cylinder sleeve 61, and a supporting plate 64 for lifting the workpiece is provided on the piston rod 62.

[0029] Specifically, a piston extending into the cylinder sleeve 61 is provided on the piston rod 62, and the air inlet hole on the cylinder sleeve 61 is located at the bottom, and the lowest position of the piston is higher than the air inlet hole. After the gas in the air storage chamber 301 enters the cylinder sleeve 61, the gas pushes the piston rod 62 to rise, thereby driving the support plate 64 to rise to lift the demolding workpiece.

[0030] Furthermore, the support plate 64 is arranged on the piston rod 62 through the bracket 63, and the support plate 64 is rotatably connected with the bracket 63, and a clockwork spring 66 is arranged between the support plate 64 and the bracket 63. When the mold opening gap between the fixed mold 2 and the movable mold 3 is small, when the bracket 63 pushes the support plate 64 to move, after the support plate 64 is squeezed by the fixed mold 2, the support plate 64 and the bracket 63 rotate relative to each other, thereby entering between the fixed mold 2 and the movable mold 3, preventing the support plate 64 from interfering with the fixed mold 2 when extending between the fixed mold 2 and the movable mold 3. After the workpiece falls on the support plate 64, the support plate 64 falls together with the workpiece until one end of the support plate 64 is separated from the fixed mold 2. At this time, the clockwork spring 66 between the support plate 64 and the bracket 63 cannot support the weight of the workpiece, and the support plate 64 and the bracket 63 rotate relative to each other to unload the workpiece.

[0031] In addition, the bracket 63 is provided with two groups of rollers 65 distributed on both sides of the support plate 64, and the diameter of the roller 65 is larger than the diameter of the rotating shaft of the support plate 64. The rollers 65 roll between the movable mold 3 when moving, reducing friction, preventing damage to the end face of the movable mold 3 during long-term work, and protecting the movable mold 3.

[0032] It is worth noting that a sealing plate for sealing the air storage cavity 301 is provided on the movable mold 3, and a sealing ring is provided at one end of the sealing plate of the push rod 41, and the sealing ring is used to keep the air storage cavity 301 sealed when the push rod 41 moves.

[0033] Working principle: After the injection molding is completed, the fixed mold 2 and the movable mold 3 are opened. At this time, the inclined guide column 21 cooperates with the guide groove 501 to guide the two sets of side sliding cores 5 to move away from each other. The side sliding cores 5 that move away from each other squeeze the airbag 31 to inflate the air storage chamber 301. At this time, the gas is introduced into the telescopic column 32 to move the guide rod out. On the other hand, the gas enters the cylinder sleeve 61, pushing the piston rod 62 to move, thereby driving the bracket 63 and the support plate 64 to move into the gap between the fixed mold 2 and the movable mold 3 until it reaches the bottom of the workpiece, and then pushes the ejector rod 41 to push the workpiece out. The guide rod on the telescopic column 32 prevents the workpiece from being quickly ejected and damaged by collision. When the workpiece is ejected and the strip groove 411 is connected to the outside world, the gas storage tank 301 The gas is discharged, and the guide rod on the telescopic column 32 is reset and retracted when the elastic part is reset. At the same time, the air is released in the piston rod 62, and the support plate 64 lifts the workpiece down to take it out to prevent the workpiece from being damaged due to excessive distance when it is demolded and dropped. When the mold is opened for maintenance and the inclined guide column 21 is completely separated from the guide groove 501, the inclined guide column 21 cancels the restriction on the limit member 51, and pushes the limit member 51 into the guide groove 501 when the elastic part is reset. The movable pressure block 52 cooperates with the limit member 51 and moves toward the movable mold 3, and cooperates with the protrusion at the end of the movable pressure block 52 to increase the friction between the movable mold 3, thereby preventing the side sliding core 5 from being displaced and affecting the subsequent mold closing, thereby improving the mold closing accuracy.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-plate mechanical core-pulling mold, comprising a fixed mold base plate (1), a fixed mold (2) and a movable mold base plate (4), wherein the fixed mold (2) is provided with an inclined guide column (21), and the movable mold base plate (4) is provided with a push rod (41), characterized in that: Also includes: A movable mold (3), wherein the movable mold (3) is provided with an air bag (31), a telescopic column (32), and an air storage chamber (301) for a push rod (41) to pass through, the air bag (31) and the telescopic column (32) are both in communication with the air storage chamber (301), the telescopic column (32) is obliquely arranged on the movable mold (3), and the push rod (41) is provided with a strip groove (411), and the strip groove (411) is used to release pressure in the air storage chamber (301) after the movable mold (3) is removed; A side sliding core (5) is slidably arranged on the movable mold (3) for extruding the airbag (31), wherein the side sliding core (5) is provided with a guide groove (501) that cooperates with the inclined guide column (21), and the guide groove (501) is used to drive the side sliding core (5) away from the mold core when the fixed mold (2) and the movable mold (3) are opened; A lifting assembly (6), the lifting assembly (6) comprising a cylinder sleeve (61) arranged on the movable mold (3) and connected to the air storage chamber (301), a piston rod (62) movably arranged on the cylinder sleeve (61), and a support plate (64) for lifting a workpiece being provided on the piston rod (62).

2. A three-plate mechanical core-pulling mold according to claim 1, characterized in that: The side sliding core (5) is slidably mounted on the movable mold (3) via a slider (53), and a push-pull plate (54) is provided on the slider (53). The push-pull plate (54) is used to move along with the side sliding core (5) to compress and stretch the airbag (31).

3. A three-plate mechanical core-pulling mold according to claim 2, characterized in that: A limit piece (51) is elastically mounted on the side sliding core (5), and the limit piece (51) extends into the guide groove (501). A movable pressing block (52) cooperating with the limit piece (51) is slidably mounted on the side sliding core (5), and when the limit piece (51) moves, the movable pressing block (52) is driven to move toward the movable mold (3) and away from the movable mold (3).

4. A three-plate mechanical core-pulling mold according to claim 3, characterized in that: The limiting member (51) is Y-shaped, and a protrusion for increasing friction is provided on a side of the movable pressing block (52) close to the movable mold (3). When the inclined guide column (21) extends into the guide groove (501), the two groups of limiting members (51) are squeezed away from each other. At this time, the movable pressing block (52) retracts into the side sliding core (5) to cancel the squeezing with the movable mold (3). When the inclined guide column (21) is completely moved out of the guide groove (501), the two groups of movable pressing blocks (52) are close to each other. At this time, the slider (53) extends out of the side sliding core (5) and squeezes the movable mold (3), thereby realizing the limitation of the side sliding core (5).

5. A three-plate mechanical core-pulling mold according to claim 1, characterized in that: The telescopic column (32) is composed of a guide sleeve and a guide rod. The guide rod is elastically mounted on the guide sleeve, and the guide sleeve is connected to the gas storage chamber (301). When the gas in the gas storage chamber (301) increases, the guide rod is squeezed out. After the ejector rod (41) pushes out the workpiece and the strip groove (411) moves out of the movable mold (3) and connects to the outside, the gas in the gas storage chamber (301) is released, thereby retracting the guide rod on the telescopic column (32).

6. A three-plate mechanical core-pulling mold according to claim 1, characterized in that: The piston rod (62) is provided with a piston extending into the cylinder sleeve (61), and the air inlet hole on the cylinder sleeve (61) is located at the bottom, and the lowest position of the piston is higher than the air inlet hole, so that the piston is pushed up when air is taken into the cylinder sleeve (61).

7. A three-plate mechanical core-pulling mold according to claim 6, characterized in that: The support plate (64) is arranged on the piston rod (62) via a bracket (63), and the support plate (64) is rotatably connected to the bracket (63). A spring (66) is provided between the support plate (64) and the bracket (63), and the spring (66) is used to prevent the support plate (64) from interfering with the fixed mold (2) when extending between the fixed mold (2) and the movable mold (3).

8. A three-plate mechanical core-pulling mold according to claim 7, characterized in that: The bracket (63) is provided with two groups of rollers (65) distributed on both sides of the support plate (64), and the diameter of the rollers (65) is larger than the diameter of the rotating shaft of the support plate (64).

9. A three-plate mechanical core-pulling mold according to claim 1, characterized in that: The movable mold (3) is provided with a sealing plate for sealing the air storage cavity (301), and a sealing ring is provided at one end of the ejector rod (41) located on the sealing plate, the sealing ring being used to keep the air storage cavity (301) sealed when the ejector rod (41) moves.

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