Core pulling device of injection mold

Abstract

The utility model discloses a core-pulling device of an injection mold. The core-pulling device comprises a core-pulling assembly, the pressing plate assembly is arranged outside at least one side of the moving direction of the core pulling assembly, and the core pulling assembly is arranged on the pressing plate assembly in a front-back moving mode; the movable part is arranged on the core pulling assembly in a manner of moving inwards and outwards; the oil cylinder connector is arranged in the core pulling assembly in a reciprocating motion mode and used for abutting against the movable part to move outwards to be locked on the pressing plate assembly in the process that the core pulling assembly is driven to move front and back, or the oil cylinder connector is separated from the movable part to enable the movable part to freely move towards the middle part to be unlocked. According to the utility model, the oil cylinder joint moves back and forth, presses the movable part to move outwards for locking, or is separated from the movable part to enable the movable part to move inwards freely for unlocking, so that the core-pulling assembly is prevented from retreating due to injection molding pressure in the injection process of a mold, and the appearance quality of injection molding products in the batch production process is improved. And moreover, the operation is simple, the cost is low, and the problem of unsmooth unlocking of the movable part can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of casting molds, and in particular relates to a core pulling device for an injection mold. Background Art

[0002] Since its introduction in the 1940s, pressure casting has been developing rapidly as a precision processing technology for metal parts close to the final shape and size. New progress has been made in die-casting equipment and its control, die-casting technology and die-casting alloys. At the same time, the market needs to mass-produce complex thin-walled and beautiful metal parts to meet the increasingly high requirements of today's automotive industry, electronic communications, household appliances, toys and other industries for die-casting parts.

[0003] In the die-casting industry, the quality of the mold has an extremely important impact on the quality of the die-casting products. Especially in the core-pulling structure, when the mold is closed and the metal liquid is filled, a huge expansion force will be generated, and the expansion force will be applied to the core-pulling slider. It is easy to push the slider due to excessive expansion force, causing the filled product structure to deform.

[0004] Chinese patent application number 201310323624.2 discloses a self-locking cylinder, comprising a locking cylinder and a clamping cylinder. The locking cylinder is located at the upper end of the clamping cylinder and is connected as a whole. Oil passages are arranged inside the locking cylinder and the clamping cylinder. A locking cylinder piston and a self-locking wedge are arranged inside the locking cylinder. The locking cylinder is provided with a locking oil inlet and a retreat oil inlet. A clamping oil inlet and a muffler are arranged at the lower part of the locking cylinder. The retreat oil inlet of the locking cylinder is connected to the retreat oil inlet of the clamping cylinder through an internal oil passage. The clamping oil inlet is connected to the clamping cylinder. The lower end of the clamping cylinder piston rod is connected to a pressure block. The pressure block clamps and releases the workpiece placed below through the up and down movement of the clamping cylinder piston rod.

[0005] This patent adopts an integrated self-locking cylinder and adds a set of cylinder actions on the basis of the original cylinder to avoid core pulling backward. The mold action of this patent is complicated and greatly increases the manufacturing cost.

[0006] In view of this, the present utility model is proposed. Utility Model Content

[0007] The purpose of the utility model is to provide a core pulling device for injection molds to solve the problems in the prior art. By moving the oil cylinder joint forward and backward, the movable part is pressed to move outward to lock, or the movable part is separated to allow the movable part to move freely inward to unlock, so as to prevent the core pulling component from retreating due to the injection pressure during the mold injection process, thereby improving the appearance quality of the injection molded product during the mass production process. In addition, the operation is simple, the cost is low, and the problem of unsmooth unlocking of the movable part can be avoided.

[0008] In order to achieve the above object, the utility model provides a core pulling device for an injection mold, comprising:

[0009] The core pulling assembly can be moved forward and backward;

[0010] A pressing plate assembly is arranged outside at least one side of the moving direction of the core pulling assembly, and the core pulling assembly can be moved forward and backward on the pressing plate assembly;

[0011] A movable part, which can be moved inside and outside and is arranged on the core pulling assembly;

[0012] The oil cylinder joint is reciprocatably arranged in the core pulling assembly, and is used to press the movable part to move outward and lock it on the pressure plate assembly during the process of driving the core pulling assembly to move forward and backward, or to disengage the movable part so that it can move freely toward the middle part and unlock it.

[0013] Furthermore, a matching guide structure is provided between the oil cylinder joint and the movable part, for guiding the oil cylinder joint to move to press against or separate from the end of the movable part.

[0014] Furthermore, the oil cylinder joint has a protruding portion on its outer periphery in the moving direction, and the guide structure is arranged between the outer peripheral edge of the protruding portion and the outer peripheral edge of the end of the movable member.

[0015] Furthermore, the guide structure includes inclined cut surfaces arranged on the outer peripheral edges of the front end and the rear end of the protruding portion, and an inclined cut surface on the outer edge of the end portion of the movable member.

[0016] Furthermore, the protrusion is arranged at the front end of the cylinder joint, and the movable part is arranged through the left and right side walls of the movable space of the cylinder joint in the core pulling assembly. When the cylinder joint moves to the front end, the protrusion presses the movable part to move outward and lock it.

[0017] Furthermore, a groove is provided on the side wall of the pressure plate assembly, and the movable member can be reversibly movable or unidirectionally reciprocatingly movable, and locked or unlocked with the groove;

[0018] A mutually matching guide structure is provided in the groove and between the other end of the movable member, and is used to guide the movable member to move toward the middle and unlock with the groove after being separated from the oil cylinder joint.

[0019] Further, the groove is arranged on the side wall of the pressing plate assembly opposite to the core pulling assembly;

[0020] The side walls at the front end and rear end of the groove respectively have a first inclined surface and a second inclined surface; the side walls at the front end and rear end of the other end of the movable part respectively have a third inclined surface and a fourth inclined surface; the third inclined surface cooperates with the first inclined surface for locking, and the fourth inclined surface cooperates with the second inclined surface to guide the movable part to escape from the groove.

[0021] Furthermore, the pressing plate assembly comprises:

[0022] A slider base, the core pulling assembly is arranged above the slider base;

[0023] A pressing plate is arranged on the slider base outside the two sides of the core pulling assembly, and the groove is arranged on the inner side wall of the pressing plate opposite to the core pulling assembly;

[0024] The movable member extends leftward and rightward and is arranged through the core pulling assembly. The inclination angle of the fourth inclined surface is smaller than the inclination angle of the third inclined surface, and smaller than the inclination angle of the second inclined surface.

[0025] Furthermore, the core pulling assembly comprises a core pulling connection block and a core pulling, and a moving channel for accommodating a movable part is provided through the core pulling connection block;

[0026] The core pulling assembly is provided with a limiting channel which radially penetrates the movable part and extends a certain length along the moving direction of the movable part; the limiting channel is fixed with a limiting column for limiting the horizontal moving range of the movable part in the moving channel.

[0027] Furthermore, the core pulling device extends forward from the core pulling connection block to the outside; a clamping portion is provided in a recessed rear end of the core pulling device, which is connected to the movable member when the movable member is locked, so as to limit the core pulling device from moving backward.

[0028] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0029] (1) In the utility model, by moving the oil cylinder joint forward and backward, the movable part is pressed to move outward and locked with the pressure plate assembly, or the movable part is disengaged so that the movable part can move freely inward to unlock, thereby preventing the core pulling assembly from retreating due to the injection pressure during the mold injection process, optimizing the core pulling position clamping line and step difference of the product, thereby improving the appearance quality of the injection molded product during mass production. In addition, the cost is low, the operation is simple, simple and reliable, and the problem of unsmooth unlocking of the movable part can be avoided.

[0030] (2) In the present invention, the design of the inclined cross-sections at the opposite ends of the cylinder joint and the movable part can not only facilitate the guidance of the cylinder joint and the movable part to abut or disengage, but also effectively avoid the failure of core pulling positioning caused by processing errors, assembly clearances, and mass production wear.

[0031] (3) In the utility model, a pressure plate is provided at the position where the movable part contacts the movable space, so as to continuously compensate for the core pulling positioning failure caused by wear according to the product conditions in the mass production process, thereby effectively improving the high-quality production life of the mold.

[0032] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0034] In the attached picture:

[0035] Figure 1 It is a schematic diagram of a core pulling device of an injection mold of the utility model;

[0036] Figure 2 This utility model Figure 1 Schematic diagram from another angle;

[0037] Figure 3 This utility model Figure 1 Schematic diagram of the cross section in the AA direction;

[0038] Figure 4 This utility model Figure 1 A schematic diagram from another angle;

[0039] Figure 5 This utility model Figure 4 Schematic diagram of the cross section in the BB direction;

[0040] Figure 6 This utility model Figure 5 A cross-sectional schematic diagram of another state;

[0041] Figure 7 This utility model Figure 6 Schematic diagram of the enlarged structure at A in the middle.

[0042] In the figure:

[0043] 1. core pulling assembly; 10. moving channel; 11. core pulling connection block; 110. activity space; 1101. first activity space; 1102. second activity space; 12. core pulling; 120. clamping part;

[0044] 2. Pressing plate assembly; 20. Groove; 200. First inclined surface; 201. Plane; 202. Second inclined surface; 21. Slider base; 22. Pressing plate;

[0045] 3. Cylinder joint; 30. Connecting shaft; 31. Protrusion;

[0046] 4. Movable part; 40. Limiting channel; 41. Limiting column; 42. Third inclined surface; 43. Fourth inclined surface; 44. Inclined section.

[0047] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0049] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] like Figures 1 to 7 As shown, the utility model provides a core pulling device for an injection mold, comprising: a core pulling assembly 1, a pressure plate assembly 2, a cylinder joint 3 and a movable part 4.

[0052] The core pulling assembly 1 can be moved forward and backward. The pressing plate assembly 2 is arranged outside at least one side of the moving direction of the core pulling assembly 1, and the core pulling assembly 1 can be moved forward and backward on the pressing plate assembly 2.

[0053] The movable part 4 is arranged on the core pulling assembly 1 so as to be movable inward and outward. The oil cylinder joint 3 is arranged in the core pulling assembly 1 so as to be reciprocatingly movable, and is used for driving the core pulling assembly 1 to move forward and backward, and the oil cylinder joint 3 presses one end of the movable part 4 so that it moves outward and is locked on the pressure plate assembly 2; or the oil cylinder joint 3 is separated from one end of the movable part 4 so that it moves freely toward the middle part and is unlocked.

[0054] In the utility model, by moving the oil cylinder joint 3 forward and backward, the movable part 4 is pressed to move outward and locked with the pressure plate assembly 2, or the movable part 4 is separated so that the movable part 4 can move freely inward to be unlocked, so as to prevent the core pulling assembly 1 from retreating due to the injection pressure during the mold injection process, optimize the core pulling position clamping line and step difference of the product, and thus improve the appearance quality of the injection molded product during the mass production process. In addition, the cost is low, the operation is simple, simple and reliable, and the problem of the movable part 4 not being unlocked smoothly can be avoided.

[0055] The core pulling assembly 1 is provided with moving channels 10 extending to both ends. The pressure plate assembly 2 is provided with a groove 20 matching the moving channel 10. The core pulling assembly 1 is slidably connected to the pressure plate assembly 2, and the cylinder joint 3 extends into and passes through the core pulling assembly 1 up and down. The cylinder joint 3 pushes the movable part 4 to move outward, moves in the moving channel 10 and is engaged in the groove 20, and is configured to limit the core pulling assembly 1 from retreating.

[0056] The movable member 4 can also be reversibly arranged in the core pulling assembly 1, such as a turning latch structure. The core pulling assembly 1 has a matching non-through moving channel 10.

[0057] like Figure 1 As shown, in this embodiment, the core pulling assembly 1 has a core pulling connection block 11 and a core pulling 12. The core pulling connection block 11 extends toward the groove 20 to set a moving channel 10. One end of the core pulling 12 is connected to the core pulling connection block 11, and the other end of the core pulling 12 is connected to the injection molded part. The movable part 4 can be slightly moved in the moving channel 10, and the movable part 4 cooperates with the groove 20 to limit the core pulling 12 from pushing the core pulling connection block 11 back.

[0058] Specifically, at least two core pulls 12 are provided, and the two core pulls 12 are connected as a whole through the core pull connection block 11. When the mold is closed, the cylinder joint 3 pushes the core pull connection block 11 to drive the two core pulls 12 to slide forward, and the movable part 4 is locked. The injection molded part is formed at one end of the core pull 12. When the injection molded part wraps the core pull 12, the core pull 12 will retreat due to the pressure formed by the injection. After the movable part 4 is unlocked, the core pull 12 and the core pull connection block 11 move backward, and the core pull 12 is out of the product undercut area to ensure product demolding.

[0059] Specifically, in order to prevent the core pulling 12 from retreating, at least two movable members 4 are arranged on the core pulling connection block 11. The movable members 4 are arranged at positions close to the left and right sides of the core pulling connection block 11 based on the central axis of the core pulling connection block 11.

[0060] The movable member 4 can slide left and right in the core-pulling connection block 11, and the movable member 4 slides out of the two side surfaces of the core-pulling connection block 11. The movable member 4 protrudes out of the core-pulling connection block 11 and is connected to the pressing plate assembly 2.

[0061] In this embodiment, the pressure plate assembly 2 has a slider base 21 and a pressure plate 22. The top of the slider base 21 has a concave portion extending downward, and the core-pulling connection block 11 is disposed in the concave portion and slidably connected to the slider base 21. At least two pressure plates 22 are provided, and the pressure plates 22 are disposed in the concave portions outside the two sides of the core-pulling connection block 11, and the pressure plates 22 are respectively recessed with grooves 20 toward the inner side of the side of the core-pulling connection block 11. The movable member 4 slides along the moving channel 10 toward the pressure plate 22 to connect to the groove 20.

[0062] Specifically, the slider base 21 is fixedly connected to the pressing plate 22 , and the core-pulling connecting block 11 can slide forward and backward in the recess. The two side surfaces of the core-pulling connecting block 11 are slidably connected to the side surfaces of the pressing plate 22 .

[0063] Specifically, the two sides where the core pulling connection block 11 is connected to the pressing plate 22 are respectively extended with protrusions, and the protrusions are embedded in the pressing plate 22. By arranging the protrusions to be embedded in the pressing plate 22, it can be ensured that the core pulling connection block 11 will not fall out of the pressing plate 22 when sliding forward and backward.

[0064] In this embodiment, a groove 20 is provided on the side wall of the pressure plate assembly 2, which may be two opposite inner side walls, or a top wall, an end portion in the moving direction, etc.

[0065] A mutually cooperating guide structure is provided in the groove 20 and between the other end of the movable member 4 , and is used to guide the movable member 4 to move toward the middle and unlock with the groove 20 after being disengaged from the cylinder joint 3 .

[0066] Preferably, the guide structure is arranged at the bottom of the groove 20 and the other end of the movable member 4 , and the guide structure cooperates with the gravity of the movable member 4 to make the movable member 4 slide toward the middle part and leave the groove 20 .

[0067] The groove 20 is recessed on the side wall of the pressing plate assembly 2 opposite to the core pulling assembly 1, and the groove 20 is opened toward the moving channel 10. The groove 20 is set through the top surface of the pressing plate 22. The rear end and / or front end of the groove 20 are inclined at a certain angle.

[0068] Specifically, the groove 20 includes a first inclined surface 200, a plane 201 and a second inclined surface 202. The first inclined surface 200 is located at the front end and the angle between the first inclined surface 200 and the plane 201 is obtuse and less than 180°. The second inclined surface 202 is located at the rear end and the angle between the first inclined surface 200 and the plane 201 is obtuse and less than 180°.

[0069] In this embodiment, the outer peripheral surface of the other end of the movable member 4 is continuously inclined at different angles. The side walls of the front end and the rear end of the other end of the movable member 4 have a third inclined surface 42 and a fourth inclined surface 43 respectively.

[0070] The third and fourth slopes 42 and 43 of the movable member 4 abut against the first and second slopes 200 and 202 of the groove 20 to prevent the core pulling assembly 1 from retreating. The fourth slope 43 also cooperates with the second slope 202 to guide the movable member 4 to escape from the groove 20 after the movable member 4 is unlocked.

[0071] The other end of the movable member 4 is connected to a plane between the third inclined plane 42 and the fourth inclined plane 43, and is located at the end surface of the other end of the movable member. The angle between the fourth inclined plane 43 and the connecting plane is an obtuse angle smaller than the angle between the third inclined plane 42 and the connecting plane. The angle between the fourth inclined plane 43 and the connecting plane is smaller than the angle between the second inclined plane 202 and the plane 201.

[0072] The angles of the first inclined surface 200 and the second inclined surface 202 can be substantially the same, so that the fourth inclined surface 43 and the second inclined surface 202 can be arranged at an angle after contacting each other, thereby guiding the movable member 4 to disengage.

[0073] In this embodiment, the core-pulling connection block 11 has an active space 110. The active space 110 is recessed from the top to the inside by a certain depth and is connected to the moving channel 10. One end of the movable member 4 extends out of the moving channel 10 to the active space 110, and the cylinder joint 3 is slidably arranged in the active space 110 to push the movable member 4 to move outward.

[0074] In this embodiment, the activity space 110 comprises: a first activity space 1101, which is arranged at the end of the core pulling connection block 11 away from the core pulling 12; and a second activity space 1102, which is connected to the first activity space 1101 and extends a certain distance forward in the same direction as the first activity space 1101. The second activity space 1102 extends a certain distance outward on both sides of the moving direction, which is greater than the width of the first activity space 1101. In the second activity space 1102, the oil cylinder joint 3 pushes the movable part 4 to slide along the moving channel 10 and protrude from the moving channel 10 plug-in groove 20.

[0075] A matching guiding structure is provided between the oil cylinder joint 3 and the movable member 4 , for guiding the oil cylinder joint 3 to move to press against or separate from one end of the movable member 4 .

[0076] The cylinder joint 3 has a protrusion 31 on the outer periphery in the moving direction, and the guide structure is arranged between the outer peripheral edge of the protrusion 31 and the outer peripheral edge of the end of the movable member 4 .

[0077] The protrusion 31 is arranged at the front end of the cylinder joint 3, and the movable part 4 is arranged through the left and right side walls of the movable space 110 of the cylinder joint 3 in the core pulling assembly 1. When the cylinder joint 3 moves to the front end, the protrusion 31 presses the movable part 4 to move outward and lock it.

[0078] In this embodiment, the oil cylinder joint 3 is set to change diameter multiple times along the sliding direction, and the oil cylinder joint 3 has: an extended connecting shaft 30, which is movably arranged in the first activity space 1101; a protrusion 31, which is extended from one end of the connecting shaft 30 to the front side, and the extension length is less than the extension length of the second activity space 1102. The protrusion 31 is movably arranged in the second activity space 1102.

[0079] The guide structure includes inclined cut surfaces 44 provided at the outer peripheral edges of the front and rear ends of the protruding portion 31 , and an inclined cut surface 44 provided at the outer edge of the end portion of the movable member 4 .

[0080] In this embodiment, the rear end of the core pull 12 has a clamping portion 120. The clamping portion 120 is recessed downward and arranged at the top of the rear end of the core pull 12 inserted into the core pull connection block 11. After the movable part 4 extends outward, it is connected to the clamping portion 120. The clamping portion 120 and the movable part 4 are configured to limit the injection molded part from pushing the core pull 12 back.

[0081] In this embodiment, the movable part 4 has a limiting channel 40 and a limiting column 41. The limiting channel 40 extends along the moving direction of the movable part 4 for a certain length, and the core-pulling connecting block 11 is provided with a limiting column 41 located in the limiting channel 40, which is used to limit the horizontal movement range of the movable part 4 in the moving channel 10.

[0082] The above scheme enables the movable part 4 to move within a preset moving range and slightly extend into the movable space 110 during the process of moving toward the middle part after being unlocked, so as to facilitate the movement of the cylinder joint 3. The guiding structure guides the inclined section 44 of the cylinder joint 3 to pass over the inclined section 44 at one end of the movable part 4, thereby realizing the pressing or separation of the protrusion 31 and one end of the movable part 4.

[0083] The limiting channel 40 passes through the movable part 4 and the core-pulling connection block 11 from top to bottom, and the limiting channel 40 extends horizontally outward to a certain length. The limiting column 41 is arranged inside the limiting channel 40 and connected to the core-pulling connection block 11 from top to bottom.

[0084] The extension length of the limiting channel 40 is greater than the diameter of the limiting column 41. Figure 5 As shown in FIG. 1 , it is a schematic diagram of the locked state of the movable member 4, and the limiting column 41 is located in the limiting channel 40 at one end close to the cylinder joint 3. Figure 6 , which is a schematic diagram of the movable member 4 being released from the locked state, the limiting column 41 is located in the end of the limiting channel 40 away from the cylinder joint 3 .

[0085] In the utility model, a pressure plate is arranged at the position where the movable part 4 abuts or contacts the movable space 110, which can continuously compensate for the core pulling positioning failure caused by wear according to the product conditions in the mass production process, and effectively improve the high-quality production life of the mold.

[0086] The utility model includes a first power unit 5 and a second power unit 6. The first power unit 5 is used to drive the oil cylinder joint 3 to move forward and backward, thereby driving the core pulling assembly 1 to move forward and backward, and the second power unit 6 is used to drive the core pulling 12 to move forward and backward. The first power unit 5 is an oil cylinder, and the second power unit 6 is an air cylinder.

[0087] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above in preferred embodiments, they are not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A core pulling device for an injection mold, characterized in that: include: The core pulling assembly (1) can be moved forward and backward; A pressure plate assembly (2) is arranged outside at least one side of the moving direction of the core pulling assembly (1), and the core pulling assembly (1) is arranged on the pressure plate assembly (2) so as to be movable forward and backward; A movable part (4) is arranged on the core pulling assembly (1) so as to be movable inward and outward; The cylinder joint (3) is reciprocatingly arranged in the core pulling assembly (1) and is used to press the movable part (4) to move outward and lock it on the pressure plate assembly (2) during the process of driving the core pulling assembly (1) to move forward and backward, or to disengage from the movable part (4) to allow it to move freely toward the middle part and unlock.

2. A core pulling device for an injection mold according to claim 1, characterized in that: The movable part (4) can be slightly movably arranged in the core pulling assembly (1), and / or a mutually matching guiding structure is provided between the cylinder joint (3) and one end of the movable part (4), for guiding the cylinder joint (3) to move to press against or separate from the end of the movable part (4).

3. A core pulling device for an injection mold according to claim 2, characterized in that: The oil cylinder joint (3) has a protruding portion (31) on the outer periphery in the moving direction, and the guide structure is arranged between the outer peripheral edge of the protruding portion (31) and the outer peripheral edge of the end of the movable member (4).

4. A core pulling device for an injection mold according to claim 3, characterized in that: The guide structure comprises inclined cut surfaces (44) arranged at the outer peripheral edges of the front and rear ends of the protruding portion (31), and an inclined cut surface (44) at the outer edge of the end portion of the movable member (4).

5. The core pulling device of an injection mold according to claim 3, characterized in that: The protrusion (31) is arranged at the front end of the cylinder joint (3), and the movable part (4) is arranged through the left and right side walls of the movable space (110) of the cylinder joint (3) in the core pulling assembly (1); when the cylinder joint (3) moves to the front end, the protrusion (31) presses the movable part (4) to move outward and lock it.

6. A core pulling device for an injection mold according to any one of claims 2 to 5, characterized in that: A groove (20) is provided on the side wall of the pressure plate assembly (2), and the movable member (4) can be reversibly movable or unidirectionally reciprocatingly movable, and can be locked or unlocked with the groove (20); A mutually matching guide structure is provided in the groove (20) and between the other end of the movable part (4), and is used to guide the movable part (4) to move toward the middle and unlock with the groove (20) after it is separated from the cylinder joint (3).

7. A core pulling device for an injection mold according to claim 6, characterized in that: The groove (20) is arranged on a side wall of the pressing plate assembly (2) opposite to the core pulling assembly (1); The front end and rear end of the groove (20) have a first inclined surface (200) and a second inclined surface (202); the front end and rear end of the other end of the movable member (4) have a third inclined surface (42) and a fourth inclined surface (43); the third inclined surface (42) cooperates with the first inclined surface (200) to lock, and the fourth inclined surface (43) and the second inclined surface (202) to lock or cooperate to guide the movable member (4) to escape from the groove (20).

8. The core pulling device of an injection mold according to claim 7, characterized in that: The pressing plate assembly (2) comprises: A slider base (21), wherein the core pulling assembly (1) is arranged above the slider base (21); A pressure plate (22) is arranged on a slider base (21) outside two sides of the core pulling assembly (1), and the groove (20) is arranged on the inner side wall of the pressure plate (22) opposite to the core pulling assembly (1); The movable part (4) extends leftward and rightward and is arranged through the core pulling assembly (1); the inclination angle of the fourth inclined surface (43) is smaller than the inclination angle of the third inclined surface (42), and smaller than the inclination angle of the second inclined surface (202).

9. A core pulling device for an injection mold according to any one of claims 2 to 5, characterized in that: The core pulling assembly (1) comprises a core pulling connection block (11) and a core pulling (12); a moving channel (10) for accommodating a movable part (4) is provided through the core pulling connection block (11); The core pulling assembly (1) is provided with a limiting channel (40) which radially penetrates the movable part (4) and extends a certain length along the moving direction of the movable part (4); a limiting column (41) is fixed to the limiting channel (40) for limiting the horizontal moving range of the movable part (4) in the moving channel (10).

10. The core pulling device of an injection mold according to claim 9, characterized in that: The core puller (12) extends forward from the core puller connection block (11) to the outside; a clamping portion (120) is provided in a recessed rear end of the core puller (12) and is connected to the movable part (4) when the movable part (4) is locked, so as to limit the core puller (12) from moving backward.

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