A core pulling and anti-retraction mechanism for the front mold oil cylinder of an injection mold

Abstract

The utility model discloses a front mold oil cylinder core pulling anti-retraction mechanism for an injection mold, comprising a front mold, a shovel base guide seat, a shovel base, an oil cylinder and a core pulling, the oil cylinder and the shovel base guide seat are fixedly arranged on the front outer wall surface of the front mold, the core pulling is located inside the front mold, the rear end of the core pulling has a product molding structure located inside the front mold, the front end of the core pulling is provided with a guide plug-in block, the shovel base has a U-shaped groove second matched with the guide plug-in block, the guide plug-in block is slidably embedded in the U-shaped groove second of the shovel base, the shovel base is slidably installed in the U-shaped groove one of the shovel base guide seat through a sliding guide component one, the left end of the shovel base is fixedly connected to the end of a piston rod extending to the right side of the oil cylinder, an anti-retraction block is protruding and fixedly arranged on the front side surface of the guide plug-in block, a groove matched with the anti-retraction block is arranged on the inner side surface of the bottom wall located on the front side of the U-shaped groove two, when the injection mold is in a mold closing state, the anti-retraction block is embedded and abutted against the inside of the groove, and a sliding guide component two for unlocking the anti-retraction block and the groove is arranged between the guide plug-in block and the U-shaped groove two. Effectively prevent the core pulling from retreating.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a front mold oil cylinder core pulling and anti-retraction mechanism for an injection mold. Background Art

[0002] With the rapid development of the automobile industry, the types of plastic parts used in automobiles are also expanding, and the structures of plastic parts are becoming more and more complex. Because some of the product structures have functional effects, this structure cannot eliminate undercuts by adjusting the product's demoulding angle. In particular, when the injection mold is molding products with undercut structures such as through holes and grooves, a core pulling mechanism is required. Due to the complexity of the product and the limited space inside the mold, the mechanical core pulling structure is often not possible. At this time, a cylinder core pulling mechanism is usually used. In actual applications, facing the large injection pressure in the mold cavity, the core pulling in the cylinder core pulling mechanism often retreats to varying degrees, resulting in defects such as flash, breakage, and severe clamping on the surface of the injection molded product. At present, most of the existing front mold cylinder core pulling anti-retraction mechanisms have more parts, a more complex installation structure, a higher preparation cost, and are not convenient for later maintenance. To this end, the utility model proposes a front mold cylinder core pulling anti-retraction mechanism for an injection mold, in order to solve the above technical problems. Summary of the invention

[0003] The purpose of the utility model is to overcome the defects existing in the prior art and provide an injection mold front mold oil cylinder core pulling anti-retraction mechanism, when the injection mold is in a mold closing state, the anti-retraction block is embedded in the groove on the shovel base and is in a locked state, and the injection pressure from the inside of the mold cavity felt by the core pulling can be effectively transmitted to the shovel base and the shovel base guide seat through the anti-retraction block, which is equivalent to forming a 90° straight surface with the shovel base after the core pulling is self-locked to resist the retreat pressure generated by the injection molding of the product, and finally disperse the injection pressure on the front mold, thereby effectively preventing the core pulling from retreating; the overall structural design is simple, compact, easy to disassemble and assemble, stable and reliable, and the preparation and implementation feasibility is high, and the practicability is strong.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is to design a front mold oil cylinder core pulling anti-retraction mechanism for an injection mold, comprising a front mold, a shovel base guide seat, a shovel base, an oil cylinder and a core pulling, wherein the oil cylinder and the shovel base guide seat are fixedly arranged on the front outer wall surface of the front mold, the core pulling is located inside the front mold, the rear end of the core pulling has a product molding structure located inside the front mold, the front end of the core pulling has a guide plug-in block, the shovel base has a U-shaped groove II matched with the guide plug-in block, the guide plug-in block is slidably embedded in the U-shaped groove II of the shovel base, and the The shovel base is slidably installed in the U-shaped groove of the shovel base guide seat through a sliding guide component. The left end of the shovel base is fixedly connected to the end of the piston rod extending to the right side of the oil cylinder. An anti-retraction block is protrudingly provided on the front side surface of the guide plug-in block. A groove matching the anti-retraction block is provided on the inner side surface of the bottom wall located on the front side of the U-shaped groove. When the injection mold is in a mold closing state, the anti-retraction block is embedded and abutted against the inside of the groove. A sliding guide component 2 for unlocking the anti-retraction block and the groove is provided between the guide plug-in block and the U-shaped groove.

[0005] The utility model discloses an injection mold front mold oil cylinder core pulling anti-retraction mechanism. When the injection mold is in a mold closing state, the anti-retraction stop block is embedded in the groove on the shovel base and is in a locked state. The injection pressure from the inside of the mold cavity felt by the core pulling can be effectively transmitted to the shovel base and the shovel base guide seat through the anti-retraction stop block, which is equivalent to forming a 90° straight surface with the shovel base after the core pulling is self-locked to resist the retreat pressure generated by product injection molding, and finally disperses the injection pressure on the front mold, thereby effectively preventing the core pulling from retreating. The overall structural design is simple, compact, easy to disassemble and assemble, stable and reliable, and the preparation and implementation feasibility is high and the practicability is strong.

[0006] The preferred technical solution is that the rear side surface of the shovel base is set as an inclined surface 1 that gradually extends to the rear side from right to left, the front side surface of the core pulling has an inclined surface 2 that fits the inclined surface 1, the guide plug-in block is protrudingly arranged at the horizontal midline position of the inclined surface 2, and the upper and lower inner wall surfaces of the U-shaped groove 2 are correspondingly provided with guide blocks 2 that gradually extend to the rear side from right to left, the guide blocks 2 located on the upper and lower inner wall surfaces of the U-shaped groove 2 divide the bottom space of the U-shaped groove 2 into limiting guide grooves, and the upper and lower outer wall surfaces of the guide plug-in block are correspondingly provided with guide grooves 4 that match the guide blocks 2, and the guide grooves 4 located on the upper and lower outer wall surfaces of the guide plug-in block divide the front side ends of the guide plug-in block into limiting guide blocks that match the limiting guide grooves, and the guide When the plug-in block is slidably embedded in the U-shaped groove 2, the limit guide block is slidably embedded in the limit guide groove, and the guide block 2 is slidably embedded in the guide groove 4. The guide block 2, the limit guide groove, the guide groove 4 and the limit guide block constitute the sliding guide assembly 2, and the thickness dimension of the limit guide block along the front-to-back direction is less than the width dimension of the limit guide groove along the front-to-back direction; when the anti-retraction block is embedded and abutted against the inside of the groove, a cavity 1 is formed between the rear side surface of the limit guide block and the corresponding front side surface of the guide block 2; after the anti-retraction block slides out of the groove and is unlocked, a cavity 2 is formed between the front side surface of the limit guide block and the front bottom surface of the limit guide groove, and the width dimensions of the cavity 1 and the cavity 2 along the front-to-back direction are both greater than the length dimension of the anti-retraction block extending out of the front side surface of the guide plug-in block. The second inclined surface on the front side of the core pulling is well adapted to the first inclined surface on the rear side of the shovel base, ensuring the stability of the two when sliding relative to each other; the second sliding guide assembly composed of the second guide block, the limiting guide groove, the fourth guide groove and the limiting guide block has a reasonable structural design, so that the anti-retraction block in the locked state can be smoothly slid out of the groove to unlock and exit, thereby ensuring that the anti-retraction mechanism of the core pulling of the front mold cylinder of the injection mold of the utility model can be smoothly prepared and implemented.

[0007] A further preferred technical solution is that a block mounting groove is provided at the right end of the front side of the guide plug-in block, the anti-retraction block is an L-shaped structure, the anti-retraction block has a support arm 1 and a support arm 2, the support arm 1 has a mounting hole, the support arm 1 is fixedly connected to the threaded blind hole at the bottom of the block mounting groove by a screw that penetrates the inside of the mounting hole, the two ends of the support arm extend to the outside of the front side of the guide plug-in block and form a clamping joint that matches the groove, and when the injection mold is in a mold-closing state, the clamping joint of the anti-retraction block is embedded and abutted against the inside of the groove. The block structure is cleverly and reasonably designed, and the fixed installation method at the bottom of the block mounting groove is simple, ensuring that the injection mold front mold oil cylinder core-pulling anti-retraction mechanism of the utility model can be smoothly assembled and processed.

[0008] A further preferred technical solution is that the upper and lower inner wall surfaces of the U-shaped groove 1 are correspondingly provided with guide blocks 1, and the upper and lower outer wall surfaces of the shovel base are correspondingly provided with guide grooves 2 adapted to the guide blocks 1. When the shovel base is slidably embedded in the shovel base guide seat, the guide block 1 on the shovel base guide seat is slidably embedded in the corresponding guide groove 2 on the shovel base, and the guide block 1 and the guide groove 2 constitute the sliding guide assembly 1. The sliding guide assembly 1 has a reasonable structural design, which ensures the smoothness of the shovel base when sliding in the shovel base guide seat.

[0009] A further preferred technical solution is that a guide groove along the horizontal direction is provided on the bottom wall located on the front side of the shovel base guide seat, and further includes a support plate, a mold opening induction switch, a mold closing induction switch and an L-shaped trigger block. The support plate is fixedly arranged on the outer side of the bottom wall located on the front side of the shovel base guide seat, the mold opening induction switch is fixedly arranged on the left end of the front side of the support plate, and the mold closing induction switch is fixedly arranged on the right end of the front side of the support plate. The horizontal arm of the L-shaped trigger block movably passes through the guide groove on the shovel base guide seat and is fixedly arranged on the shovel base. The vertical arm of the L-shaped trigger block is correspondingly located outside the front side of the support plate. The mold opening induction switch, the mold closing induction switch, the L-shaped trigger block and the shovel base sliding position cooperate precisely to achieve precise control of the mold opening and closing states of the injection mold.

[0010] A further preferred technical solution is that the left end of the shovel base is provided with a U-shaped groove three which is connected with the left end of the U-shaped groove two and opens to the left, and the upper and lower inner wall surfaces of the U-shaped groove three are correspondingly provided with guide blocks three along the front-to-back direction, and the right end of the piston rod is fixed with a cylinder connecting block, and the upper and lower side surfaces of the cylinder connecting block are correspondingly provided with guide grooves three which are compatible with the guide block three, the cylinder connecting block is embedded in the U-shaped groove three of the shovel base, and the guide block three is embedded in the corresponding guide groove three.

[0011] A further preferred technical solution is that a wear-resistant sheet is fixed on the outer peripheral side of the core-pulling device, which improves the wear resistance of the core-pulling device and helps to extend the service life of the injection mold.

[0012] A further preferred technical solution is that the outer peripheral side of the core pulling block is provided with an embedding groove, the wear-resistant sheet is embedded in the embedding groove on the outer peripheral side of the core pulling block, and is fixedly connected to the threaded blind hole at the bottom of the embedding groove by screws passing through the wear-resistant sheet. The wear-resistant sheet is a vulnerable part, and the fixing and installation method of the wear-resistant sheet on the core pulling block is simple, which is convenient for later maintenance and replacement.

[0013] A further preferred technical solution also includes a cylinder fixing block, which is fixedly mounted on the front outer wall of the front mold by a bolt assembly, and the cylinder is fixedly mounted on the cylinder fixing block by a bolt assembly. The fixing and mounting method of the cylinder on the front mold is simple, and the cylinder is externally mounted on the front mold, which is convenient for later maintenance.

[0014] The advantages and beneficial effects of the utility model are:

[0015] 1. The utility model provides an anti-retraction mechanism for the core pulling of the front mold oil cylinder of the injection mold. When the injection mold is in the mold closing state, the anti-retraction block is embedded in the groove on the shovel base and is in a locked state. The injection pressure from the inside of the mold cavity felt by the core pulling can be effectively transmitted to the shovel base and the shovel base guide seat through the anti-retraction block, which is equivalent to forming a 90° straight surface with the shovel base after the core pulling is self-locked to resist the retreat pressure generated by the injection molding of the product, and finally disperse the injection pressure on the front mold, thereby effectively preventing the core pulling from retreating; the overall structural design is simple, compact, easy to disassemble and assemble, stable and reliable, and the preparation and implementation feasibility is high and the practicability is strong.

[0016] 2. The second inclined surface on the front side of the core pulling and the first inclined surface on the rear side of the shovel base have good adaptability, ensuring the stability of the two when sliding relative to each other; the second guide block, the limiting guide groove, the fourth guide groove and the limiting guide block constitute the second sliding guide assembly structure, so that the anti-retraction block in the locked state can be smoothly slid out of the groove to unlock and exit, thereby ensuring that the anti-retraction mechanism of the core pulling of the front mold cylinder of the injection mold of the utility model can be smoothly prepared and implemented.

[0017] 3. The mold opening sensor switch, mold closing sensor switch, L-shaped trigger block and shovel base sliding position work together precisely to achieve precise control of the injection mold opening and closing status. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram of the use state of a core-pulling and anti-retraction mechanism of a front mold oil cylinder of an injection mold of the utility model;

[0019] Figure 2 It is a three-dimensional diagram of a core-pulling and anti-retraction mechanism of a front mold oil cylinder of an injection mold of the utility model;

[0020] Figure 3 This is a three-dimensional diagram of a core-pulling anti-retraction mechanism of a front mold oil cylinder of an injection mold of the utility model (the shovel base guide seat is hidden);

[0021] Figure 4 This is a disassembled diagram of a core-pulling and anti-retraction mechanism of a front mold oil cylinder of an injection mold of the utility model;

[0022] Figure 5 It is a three-dimensional structural diagram of core pulling;

[0023] Figure 6This is the assembly relationship diagram of the shovel base and the oil cylinder;

[0024] Figure 7 It is a cross-sectional view of the assembly relationship between the shovel base, the oil cylinder and the core puller;

[0025] Figure 8 yes Figure 7 A partial enlarged view of the H in the middle;

[0026] Fig. 9 This is the matching relationship diagram between the core puller and the shovel base in the mold closing state;

[0027] Fig.10 It is a partial cross-sectional view after the anti-retraction block on the core pulling is separated from the groove on the shovel base;

[0028] Fig.11 This is a diagram of the matching relationship between the core pulling and the shovel base after the anti-retraction block on the core pulling is separated from the groove on the shovel base.

[0029] In the figure: 1, front mold; 2, shovel base guide seat; 3, shovel base; 4, oil cylinder; 5, core pulling; 6, anti-retraction block; 7, support plate; 8, mold opening sensor switch; 9, mold closing sensor switch; 10, L-shaped trigger block; 2-1, U-shaped groove 1; 2-2, guide block 1; 2-3, guide groove 1; 3-1, U-shaped groove 2; 3-2, guide groove 2; 3-3, guide block 2; 3-4, limit guide groove; 3-4a, groove; 3-5, U-shaped groove 3; 3-5a, Guide block three; 4-1, piston rod; 4-2, cylinder connecting block; 4-2a, guide groove three; 4-3, cylinder fixing block; 5-1, guide plug-in block; 5-2, guide groove four; 5-3, limit guide block; 5-4, block mounting groove; 5-5, product molding structure; 5-6, wear-resistant sheet; 6-1, support arm one; 6-2, support arm two; 6-2a, clamping joint; 6-3, screw; A, cavity one; B, cavity two; C, inclined plane one; D, inclined plane two. DETAILED DESCRIPTION

[0030] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0031] Example

[0032] like Figures 1 to 6As shown, the utility model is a front mold oil cylinder core pulling anti-retraction mechanism for an injection mold, comprising a front mold 1, a shovel base guide seat 2, a shovel base 3, an oil cylinder 4 and a core pulling 5, wherein the oil cylinder 4 and the shovel base guide seat 2 are fixedly arranged on the front outer wall surface of the front mold 1, the core pulling 5 is located inside the front mold 1, the rear end of the core pulling 5 has a product molding structure 5-5 located inside the front mold 1, the front end of the core pulling 5 has a guide plug-in block 5-1, the shovel base 3 has a U-shaped groove 3-1 adapted to the guide plug-in block 5-1, the guide plug-in block 5-1 is slidably embedded in the U-shaped groove 3-1 of the shovel base 3, and the shovel base 3 is slidably inserted into the U-shaped groove 3-1 of the shovel base 3. A movable guide component is slidably installed inside the U-shaped groove 2-1 of the shovel base guide seat 2. The left end of the shovel base 3 is fixedly connected to the end of the piston rod 4-1 extending to the right side of the cylinder 4. An anti-retraction block 6 is protruding and fixed on the front side surface of the guide plug-in block 5-1. A groove 3-4a matching the anti-retraction block 6 is provided on the inner side surface of the bottom wall located on the front side of the U-shaped groove 3-1. When the injection mold is in the mold closing state, the anti-retraction block 6 is embedded and abutted against the inside of the groove 3-4a. A sliding guide component 2 for unlocking the anti-retraction block 6 and the groove 3-4a is provided between the guide plug-in block 5-1 and the U-shaped groove 3-1.

[0033] Preferably, the rear side surface of the shovel base 3 is set as a slope C that gradually extends from right to left to the rear side, the front side surface of the core pulling 5 has a slope D that fits the slope C, the guide plug-in block 5-1 is protruded at the horizontal midline position of the slope D, and the upper and lower inner wall surfaces of the U-shaped groove 2 3-1 are correspondingly provided with guide blocks 2 3-3 that gradually extend from right to left to the rear side. The guide blocks 2 3-3 located on the upper and lower inner wall surfaces of the U-shaped groove 2 3-1 divide the bottom space of the U-shaped groove 2 3-1 into limiting guide grooves 3-4, and the upper and lower outer wall surfaces of the guide plug-in block 5-1 are correspondingly provided with guide grooves 4 5-2 that match the guide blocks 2 3-3. The guide grooves 4 5-2 located on the upper and lower outer wall surfaces of the guide plug-in block 5-1 divide the front side end of the guide plug-in block 5-1 into limiting guide blocks 5-3 that match the limiting guide grooves 3-4. The guide plug-in block 5-1 is slidably embedded in When installed in the U-shaped groove 2 3-1, the limiting guide block 5-3 is slidably embedded in the limiting guide groove 3-4, and the guide block 2 3-3 is slidably embedded in the guide groove 4 5-2. The guide block 2 3-3, the limiting guide groove 3-4, the guide groove 4 5-2 and the limiting guide block 5-3 constitute the sliding guide assembly 2, and the thickness dimension of the limiting guide block 5-3 along the front-to-back direction is less than the width dimension of the limiting guide groove 3-4 along the front-to-back direction; When the anti-retraction block 6 is embedded and abutted against the inside of the groove 3-4a, a cavity A is formed between the rear side surface of the limiting guide block 5-3 and the corresponding front side surface of the guide block 2 3-3; after the anti-retraction block 6 slides out from the inside of the groove 3-4a and is unlocked, a cavity 2 B is formed between the front side surface of the limiting guide block 5-3 and the front bottom surface of the limiting guide groove 3-4, and the width dimensions of cavity 1 A and cavity 2 B along the front-to-back direction are both greater than the length dimension of the anti-retraction block 6 extending out of the front side surface of the guide plug-in block 5-1.

[0034] Further preferably, a block mounting groove 5-4 is provided at the right end of the front side surface of the guide plug-in block 5-1, and the anti-retraction block 6 is an L-shaped structure. The anti-retraction block 6 has a support arm 1 6-1 and a support arm 2 6-2. The support arm 1 6-1 has a mounting hole. The support arm 1 6-1 is fixedly connected to the threaded blind hole at the bottom of the block mounting groove 5-4 by a screw 6-3 passing through the inside of the mounting hole. The end of the support arm 2 6-2 extends to the outside of the front side surface of the guide plug-in block 5-1 and forms a clamping joint 6-2a that is compatible with the groove 3-4a. When the injection mold is in the mold closing state, the clamping joint 6-2a of the anti-retraction block 6 is embedded and abutted against the inside of the groove 3-4a.

[0035] Further preferably, guide blocks 2-2 are correspondingly provided on the upper and lower inner wall surfaces of the U-shaped groove 2-1, and guide grooves 3-2 matched with the guide blocks 2-2 are correspondingly provided on the upper and lower outer wall surfaces of the shovel base 3. When the shovel base 3 is slidably embedded in the shovel base guide seat 2, the guide block 2-2 on the shovel base guide seat 2 is slidably embedded in the corresponding guide groove 3-2 on the shovel base 3. The guide block 2-2 and the guide groove 3-2 constitute the sliding guide component 1.

[0036] Further preferably, a guide groove 2-3 along the horizontal direction is provided on the bottom wall located on the front side of the shovel base guide seat 2, and also includes a support plate 7, a mold opening sensor switch 8, a mold closing sensor switch 9 and an L-shaped trigger block 10. The support plate 7 is fixedly arranged on the outer surface of the bottom wall on the front side of the shovel base guide seat 2, the mold opening sensor switch 8 is fixedly arranged on the left end of the front side surface of the support plate 7, and the mold closing sensor switch 9 is fixedly arranged on the right end of the front side surface of the support plate 7. The horizontal support arm of the L-shaped trigger block 10 movably passes through the guide groove 2-3 on the shovel base guide seat 2 and is fixedly arranged on the shovel base 3. The vertical support arm of the L-shaped trigger block 10 is correspondingly located on the outside of the front side surface of the support plate 7.

[0037] Further preferably, the left end of the shovel base 3 is provided with a U-shaped groove three 3-5 which is connected with the left end of the U-shaped groove two 3-1 and opens to the left, and the upper and lower inner wall surfaces of the U-shaped groove three 3-5 are correspondingly provided with guide blocks three 3-5a along the front-to-back direction, and the right end of the piston rod 4-1 is fixed with a cylinder connecting block 4-2, and the upper and lower side surfaces of the cylinder connecting block 4-2 are correspondingly provided with guide grooves three 4-2a matched with the guide blocks three 3-5a, and the cylinder connecting block 4-2 is embedded in the U-shaped groove three 3-5 of the shovel base 3, and the guide block three 3-5a is embedded in the corresponding guide groove three 4-2a.

[0038] Further preferably, wear-resistant sheets 5 - 6 are fixedly provided on the outer peripheral side of the core pulling 5 .

[0039] Further preferably, an embedding groove is provided on the outer peripheral side of the core pulling 5, and the wear-resistant sheet 5-6 is embedded in the embedding groove on the outer peripheral side of the core pulling 5, and is fixedly connected to the threaded blind hole at the bottom of the embedding groove by screws 6-3 passing through the wear-resistant sheet 5-6.

[0040] Further preferably, it also includes a cylinder fixing block 4-3, which is fixedly mounted on the front outer wall surface of the front mold 1 by a bolt assembly, and the cylinder 4 is fixedly mounted on the cylinder fixing block 4-3 by a bolt assembly.

[0041] The working principle of the front mold oil cylinder core pulling and anti-retraction mechanism of the injection mold of the utility model is as follows:

[0042] like Figure 1 , 7 As shown in , 8 and 9, when the injection mold is in the mold closing state, the vertical arm of the L-shaped trigger block 10 is in contact with the mold closing induction switch 9, the piston rod 4-1 of the oil cylinder 4 is in an extended state, and the shovel base 3 is located at the rightmost end of the stroke trajectory. At this time, the clamping joint 6-2a on the anti-retraction block 6 is embedded and abutted against the inside of the groove 3-4a of the shovel base 3, and the clamping joint 6-2a and the groove 3-4a are in a locked state. A cavity A is formed between the rear side surface of the limiting guide block 5-3 and the front side surface of the corresponding guide block 2 3-3. The injection pressure from the inside of the mold cavity on the core pull 5 is dispersed on the shovel base 3 and the shovel base guide seat 2 through the anti-retraction block 6, thereby effectively preventing the core pull 5 from retreating; Figures 10-11 As shown, when the product needs to be demoulded, first the piston rod 4-1 of the oil cylinder 4 begins to contract and drives the shovel base 3 to gradually move to the left. Under the guidance of the sliding guide component 2, the clamping joint 6-2a on the anti-retraction block 6 gradually slides out of the groove 3-4a of the shovel base 3 and unlocks. At this time, a cavity 2 B is formed between the front side surface of the limiting guide block 5-3 and the front bottom surface of the limiting guide groove 3-4. The piston rod 4-1 continues to contract until the vertical arm of the L-shaped trigger block 10 abuts against the mold opening sensing switch 8, and the injection mold starts to start the subsequent mold opening operation.

[0043] The utility model discloses an injection mold front mold oil cylinder core pulling anti-retraction mechanism. When the injection mold is in a mold closing state, the anti-retraction stop block is embedded in the groove on the shovel base and is in a locked state. The injection pressure from the inside of the mold cavity felt by the core pulling can be effectively transmitted to the shovel base and the shovel base guide seat through the anti-retraction stop block, which is equivalent to forming a 90° straight surface with the shovel base after the core pulling is self-locked to resist the retreat pressure generated by product injection molding, and finally disperses the injection pressure on the front mold, thereby effectively preventing the core pulling from retreating. The overall structural design is simple, compact, easy to disassemble and assemble, stable and reliable, and the preparation and implementation feasibility is high and the practicability is strong.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An injection mold front mold oil cylinder core pulling anti-retraction mechanism, characterized in that: The invention comprises a front mold (1), a shovel base guide seat (2), a shovel base (3), an oil cylinder (4) and a core puller (5), wherein the oil cylinder (4) and the shovel base guide seat (2) are fixedly arranged on the front outer wall surface of the front mold (1), the core puller (5) is located inside the front mold (1), the rear end of the core puller (5) has a product forming structure (5-5) located inside the front mold (1), the front end of the core puller (5) has a guide plug-in block (5-1), the shovel base (3) has a U-shaped groove (3-1) matched with the guide plug-in block (5-1), the guide plug-in block (5-1) is slidably embedded in the U-shaped groove (3-1) of the shovel base (3), and the shovel base (3) is slidably connected to the U-shaped groove (3-1) of the shovel base (3), and the shovel base (3) is slidably connected to the U-shaped groove (3-1) of the shovel base (3). The shovel base (3) is movably mounted inside the U-shaped groove (2-1) of the shovel base guide seat (2); the left end of the shovel base (3) is fixedly connected to the end of the piston rod (4-1) extending to the right of the oil cylinder (4); an anti-retraction block (6) is protruding and fixed on the front side surface of the guide plug-in block (5-1); a groove (3-4a) matched with the anti-retraction block (6) is provided on the inner side surface of the bottom wall located on the front side of the U-shaped groove (3-1); when the injection mold is in a mold closing state, the anti-retraction block (6) is embedded and abutted against the inside of the groove (3-4a); and a sliding guide component (2) for unlocking the anti-retraction block (6) and the groove (3-4a) is provided between the guide plug-in block (5-1) and the U-shaped groove (3-1).

2. The injection mold front mold oil cylinder core pulling anti-retraction mechanism according to claim 1, characterized in that: The rear side surface of the shovel base (3) is provided with a sloped surface (C) gradually extending from right to left to the rear side, the front side surface of the core puller (5) has a sloped surface (D) that fits the sloped surface (C), the guide plug-in block (5-1) is protrudingly arranged at the horizontal midline position of the sloped surface (D), and the upper and lower inner wall surfaces of the U-shaped groove (3-1) are provided with guide blocks (3-3) gradually extending from right to left to the rear side, and the guide blocks (3-3) located on the upper and lower inner wall surfaces of the U-shaped groove (3-1) are provided with guide blocks (3-3) on the upper and lower inner wall surfaces of the U-shaped groove (3-1). ) divides the bottom space of the U-shaped groove 2 (3-1) into a limiting guide groove (3-4), and the upper and lower outer wall surfaces of the guide plug-in block (5-1) are correspondingly provided with a guide groove 4 (5-2) adapted to the guide block 2 (3-3), and the guide groove 4 (5-2) located on the upper and lower outer wall surfaces of the guide plug-in block (5-1) divides the front side end of the guide plug-in block (5-1) into a limiting guide block (5-3) adapted to the limiting guide groove (3-4), and the guide plug-in block (5-1) is slidably embedded in the When the U-shaped groove (3-1) is inside, the limiting guide block (5-3) is slidably embedded in the limiting guide groove (3-4), and the guide block (3-3) is slidably embedded in the guide groove (5-2). The guide block (3-3), the limiting guide groove (3-4), the guide groove (5-2) and the limiting guide block (5-3) constitute the sliding guide assembly (2), and the thickness dimension of the limiting guide block (5-3) along the front-to-back direction is less than the width dimension of the limiting guide groove (3-4) along the front-to-back direction; the anti-retraction block (6 ) is embedded and abutted against the inside of the groove (3-4a), a cavity one (A) is formed between the rear side surface of the limiting guide block (5-3) and the front side surface of the corresponding guide block two (3-3); after the anti-retraction block (6) slides out of the groove (3-4a) and is unlocked, a cavity two (B) is formed between the front side surface of the limiting guide block (5-3) and the front bottom surface of the limiting guide groove (3-4), and the width dimensions of cavity one (A) and cavity two (B) along the front-to-back direction are both greater than the length dimension of the anti-retraction block (6) extending out of the front side surface of the guide plug-in block (5-1).

3. The injection mold front mold oil cylinder core pulling anti-retraction mechanism according to claim 2, characterized in that: A block mounting groove (5-4) is provided at the right end of the front side of the guide plug-in block (5-1); the anti-retraction block (6) is an L-shaped structure; the anti-retraction block (6) comprises a support arm 1 (6-1) and a support arm 2 (6-2); the support arm 1 (6-1) comprises a mounting hole; the support arm 1 (6-1) is fixedly connected to the threaded blind hole at the bottom of the block mounting groove (5-4) by screwing a screw (6-3) inserted into the mounting hole; the end of the support arm 2 (6-2) extends to the outside of the front side of the guide plug-in block (5-1) and forms a clamping joint (6-2a) matched with the groove (3-4a); when the injection mold is in a mold closing state, the clamping joint (6-2a) of the anti-retraction block (6) is embedded and abutted against the inside of the groove (3-4a).

4. The injection mold front mold oil cylinder core pulling anti-retraction mechanism according to claim 3, characterized in that: The U-shaped groove 1 (2-1) is provided with guide blocks 1 (2-2) on the upper and lower inner wall surfaces, and the shovel base (3) is provided with guide grooves 2 (3-2) matching the guide blocks 1 (2-2) on the upper and lower outer wall surfaces. When the shovel base (3) is slidably mounted inside the shovel base guide seat (2), the guide blocks 1 (2-2) on the shovel base guide seat (2) are slidably mounted inside the corresponding guide grooves 2 (3-2) on the shovel base (3). The guide blocks 1 (2-2) and the guide grooves 2 (3-2) constitute the sliding guide assembly 1.

5. The injection mold front mold oil cylinder core pulling anti-retraction mechanism according to claim 4, characterized in that: A guide groove (2-3) along the horizontal direction is provided on the bottom wall located on the front side of the shovel base guide seat (2), and also includes a support plate (7), a mold opening induction switch (8), a mold closing induction switch (9) and an L-shaped trigger block (10). The support plate (7) is fixedly arranged on the outer side of the bottom wall on the front side of the shovel base guide seat (2), the mold opening induction switch (8) is fixedly arranged on the left end of the front side of the support plate (7), and the mold closing induction switch (9) is fixedly arranged on the right end of the front side of the support plate (7), the horizontal support arm of the L-shaped trigger block (10) movably passes through the guide groove (2-3) on the shovel base guide seat (2) and is fixedly arranged on the shovel base (3), and the vertical support arm of the L-shaped trigger block (10) is correspondingly located on the outside of the front side of the support plate (7).

6. The injection mold front mold oil cylinder core pulling anti-retraction mechanism according to claim 5, characterized in that: The left end of the shovel base (3) is provided with a U-shaped groove three (3-5) which penetrates the left end of the U-shaped groove two (3-1) and opens to the left. The upper and lower inner wall surfaces of the U-shaped groove three (3-5) are provided with guide blocks three (3-5a) along the front-back direction. The right end of the piston rod (4-1) is fixed with a cylinder connecting block (4-2). The upper and lower side surfaces of the cylinder connecting block (4-2) are provided with guide grooves three (4-2a) matched with the guide blocks three (3-5a). The cylinder connecting block (4-2) is embedded in the U-shaped groove three (3-5) of the shovel base (3), and the guide block three (3-5a) is embedded in the corresponding guide groove three (4-2a).

7. The injection mold front mold oil cylinder core pulling anti-retraction mechanism according to claim 6, characterized in that: A wear-resistant sheet (5-6) is fixedly arranged on the outer peripheral side of the core pulling (5).

8. The injection mold front mold oil cylinder core pulling anti-retraction mechanism according to claim 7, characterized in that: The outer peripheral side of the core pulling (5) is provided with an embedding groove, and the wear-resistant sheet (5-6) is embedded in the embedding groove on the outer peripheral side of the core pulling (5) and is fixedly connected to the threaded blind hole at the bottom of the embedding groove by screws (6-3) passing through the wear-resistant sheet (5-6).

9. The injection mold front mold oil cylinder core pulling anti-retraction mechanism according to claim 8, characterized in that: It also comprises an oil cylinder fixing block (4-3), wherein the oil cylinder fixing block (4-3) is fixedly mounted on the front outer wall surface of the front mold (1) by means of a bolt assembly, and the oil cylinder (4) is fixedly mounted on the oil cylinder fixing block (4-3) by means of a bolt assembly.

Images