CN219028403U

CN219028403U - Forced safety mechanism for core pulling of mold

Info

Publication number: CN219028403U
Application number: CN202223550965.7U
Authority: CN
Inventors: 王纪学; 孙文强; 王洪波; 刘川东; 孙洪伟; 徐超; 唐文成; 孙学恒
Original assignee: Qingdao Hi Tech Moulds Co ltd
Current assignee: Qingdao Hi Tech Moulds Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-16
Anticipated expiration: 2032-12-29

Abstract

The utility model discloses a forced safety mechanism for core pulling of a mold, which comprises a fixed mold, a movable mold, a core pulling structure and a safety drag hook. The core pulling structure is arranged at the end side of the fixed die and comprises a fixed bracket, a hydraulic cylinder, a core pulling seat and a movable core pulling structure, wherein the hydraulic cylinder is arranged on the fixed bracket; the core drawing seat is accommodated in a sliding groove arranged on the fixed die, and the outer end of the core drawing seat is connected with the tail end of a piston rod of the hydraulic oil cylinder; the movable loose core is slidably arranged at the inner end of the loose core seat, and the lower end of the movable loose core passes through the fixed die and is positioned in the product forming area. The upper end of the safety drag hook is fixed at the outer end of the core drawing seat, and the tail end of the transverse rod points to the movable mould. A limiting block is fixed on the outer side wall of the movable die; and when the mold is closed, the limiting block is arranged above the transverse rod in the safety drag hook. The utility model has simple structure and reasonable design; the phenomenon of pulling a product during die opening and knocking the die during die closing caused by improper operation and core pulling failure or resetting can be effectively prevented, and the quality of the product is improved; and simultaneously, the service life of the die is prolonged.

Description

Forced safety mechanism for core pulling of mold

Technical Field

The utility model relates to the technical field of injection molds, in particular to a forced safety mechanism for core pulling of a mold.

Background

With the rapid development of the plastic industry, various tools and products used in daily production and life, such as ships, automobiles, screws, buttons and shells of various household appliances, are not closely related to plastic products. The injection mold is an important technological equipment for producing various plastic industrial products, and is also a tool for endowing plastic products with complete structures and precise dimensions. Injection molding is a processing method used in mass production of parts with complex shapes; specifically, heated and melted plastic is injected into a die cavity formed by buckling a movable die and a fixed die through an injection molding machine under high pressure, and a formed product is obtained after cooling and solidification. However, according to the processing requirement of the products, through holes exist on the surfaces of some products, so a core pulling structure is arranged in the injection mold; before the mold is opened, the core-pulling structure in the mold firstly performs core-pulling, but due to various improper operations, the mold is opened in fashion, the core-pulling operation is easy to be completed, so that the core-pulling in the product is not withdrawn, at the moment, the mold is opened easily to pull the product, the product is damaged, and the product quality and the demolding effect are affected; or in the process of die assembly, the core-pulling structure is reset, so that the die collision phenomenon is easy to occur, the die cavity is damaged, and the service life of the die is influenced.

Disclosure of Invention

The utility model aims to solve the defects existing in the prior art and provides a forced safety mechanism for core pulling of a die.

In order to solve the technical problems, the utility model adopts the following technical scheme: a forced safety mechanism for core pulling of a die comprises a fixed die, a movable die, a core pulling structure and a safety drag hook. The movable mould is positioned below the fixed mould and can be relatively buckled for injection molding; the core pulling structure is arranged at the end side of the fixed die and comprises a fixed support, a hydraulic cylinder, a core pulling seat and a movable core pulling seat, wherein the fixed support is arranged on the outer side wall of the fixed die; the longitudinal section of the safety drag hook is L-shaped, the upper end of the vertical rod of the safety drag hook is fixed at the outer end part of the core drawing seat, and the tail end of the transverse rod of the safety drag hook points to the movable die; a limiting block is fixedly arranged on the outer side wall of the movable die at a position corresponding to the safety drag hook; and when the mold is closed, the limiting block is arranged above the transverse rod in the safety drag hook.

Further, the fixing support is arranged in a U shape, and the outer end of the core drawing seat is arranged in a U-shaped cavity of the fixing support; two travel switches are arranged on the upper end surface of one support arm of the fixed support at intervals, a poking plate is fixedly arranged on the outer end of the core drawing seat and the corresponding side of the travel switch, and the poking plate is arranged between the two travel switches.

Further, the core pulling structure is provided with two core pulling structures which are respectively and fixedly arranged at two end sides of the fixed die and are arranged in a central symmetry mode.

Further, the length of the transverse rod in the safety drag hook is equal to the distance between the two travel switches, and compared with the protruding length of the outer side wall of the movable die, the limiting block is equal to the distance between the two travel switches.

Further, the two safety draw hooks are respectively fixed at the outer ends of the core drawing seats at the corresponding sides; two limiting blocks are arranged on the movable mould and correspond to the safety drag hooks.

Further, a fixing lug is arranged on one side, facing the core drawing seat, of the upper end face of the vertical rod in the safety drag hook, an installation groove matched with the fixing lug is formed in the outer end face of the core drawing seat, and the upper end of the safety drag hook is fixed in the corresponding installation groove through a countersunk bolt.

Further, a limiting block mounting groove is formed in the outer side wall of the movable die, and one end, close to the movable die, of the limiting block is embedded into the corresponding limiting block mounting groove.

Further, the T-shaped groove arranged at the inner end of the core pulling seat is obliquely arranged, and the upper end of the movable core pulling seat is fixedly provided with a T-shaped sliding block which is matched with the T-shaped groove to slide.

Compared with the prior art, the utility model has the following beneficial effects: the utility model has simple structure, reasonable design and convenient maintenance; through the arrangement of the safety drag hook, the phenomena of pulling the product during die opening and colliding the die during die closing caused by the fact that core pulling is not withdrawn or reset due to improper operation are effectively prevented, the quality of the product is improved, and the production efficiency is improved; the die cavity is effectively protected, and the service life of the die is prolonged.

Drawings

FIG. 1 is a schematic view of the structure of an injection molded product;

FIG. 2 is a schematic diagram of the overall structure of the present utility model;

FIG. 3 is an assembly relationship diagram of a fixed mold, a movable mold and a core pulling structure in the utility model;

FIG. 4 is an upper view of the stationary mold of the present utility model;

FIG. 5 is an exploded view of the movable mold and the stopper according to the present utility model;

FIG. 6 is a diagram showing the assembly relationship between the core pulling structure and the safety hook in the present utility model;

FIG. 7 is an outer end view of the mandrel holder of the present utility model;

FIG. 8 is a schematic view of the structure of the drag hook of the present utility model;

in the figure: 1. base, 2, cover half, 3, movable mould, 4, structure of loosing core, 5, insurance drag hook, 6, stopper, 7, product, 8, through-hole, 21, sliding groove, 22, loose core hole, 23, fixed slot, 31, stopper mounting groove, 41, fixed bolster, 42, hydraulic cylinder, 43, loose core seat, 44, movable loose core, 45, travel switch, 46, plectrum, 47, T type groove, 48, mounting groove, 49, plectrum mounting groove, 50, connecting portion, 51, vertical pole, 52, transverse pole, 53, fixed bump.

Detailed Description

It should be noted that, in the description of the present utility model, terms such as "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "top", "bottom", "vertical", "lateral", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, but relational terms are merely determined for convenience in describing structural relationships of the components in the present utility model, and do not particularly denote that any one of the components of the present utility model must have a specific orientation, be configured and operated in a specific orientation, and should not be construed as limiting the present utility model.

It should be further noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and include, for example, either fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings:

as shown in fig. 1, a through hole 8 is required to be formed on an injection molded product 7, a core pulling structure is often required to be additionally arranged in a mold for injection molding of the through hole 8, and due to the existence of the core pulling structure, a mold opening is easily caused to pull out a product and crush a mold cavity under the condition of improper operation, and in order to avoid the occurrence of the condition, the utility model provides a forced safety mechanism for mold core pulling, which comprises a fixed mold 2, a movable mold 3, a core pulling structure 4 and a safety drag hook 5, as shown in fig. 2 to 5. The fixed die 2 is fixedly arranged below the base 1, and the upper surface of the fixed die is provided with a sliding groove 21; and corresponding to the forming position of the through hole 8 on the product 7, the fixed die 2 is also provided with a core pulling hole 22 penetrating through the fixed die, and the upper end of the core pulling hole 22 is communicated with the sliding groove 21. Core pulling structures 4 are arranged at the left end and the right end of the fixed die 2, and the two core pulling structures 4 are arranged in a central symmetry mode; as shown in fig. 6, each core-pulling structure 4 includes a fixed bracket 41, a hydraulic cylinder 42, a core-pulling seat 43, and a movable core-pulling 44. Two fixing grooves 23 are respectively formed in the outer side walls of the left end and the right end of the fixed die 2, the cross section of the fixing bracket 41 is U-shaped, and the two end parts of the fixing bracket are arranged on the corresponding fixing grooves 23 through countersunk bolts; the hydraulic cylinder 42 is fixedly installed above the fixed bracket 41, and the expansion and contraction direction of a piston rod of the hydraulic cylinder is overlapped with the central line of the sliding groove 21; the core-pulling seat 43 is accommodated in the sliding groove 21 and can slide along the sliding groove, the outer end of the core-pulling seat 43 is positioned in the U-shaped cavity of the fixed bracket 41, a connecting part 50 as shown in fig. 7 is arranged on the core-pulling seat, and the core-pulling seat is detachably and fixedly connected with the tail end of a piston rod of the hydraulic cylinder 42 through a rod end connecting piece; a T-shaped groove 47 is arranged below the inner end of the core pulling seat 43 and is arranged at an inclined angle; the upper end of the movable core pulling piece 44 is fixedly provided with a T-shaped sliding block, and the T-shaped sliding block is slidably arranged in a T-shaped groove 47 of the core pulling seat 43 and is mutually matched; the movable core-pulling 44 is arranged in the corresponding core-pulling hole 22 on the fixed die 2, the lower end of the movable core-pulling 44 penetrates through the fixed die 2 and is positioned in a product forming area, and when the movable die 3 and the fixed die 2 are matched, the lower end of the movable core-pulling 44 is inserted into the movable die 3 to be matched with the movable die to form a through hole for forming. Two travel switches 45 arranged at intervals are fixedly arranged above one support arm of the fixed support 41; corresponding to the travel switches 45, a pulling piece mounting groove 49 is provided on the outer side wall of the core pulling seat 43, as shown in fig. 7, a pulling piece 46 is transversely fixed in the pulling piece mounting groove 49 through a bolt, and the movable end of the pulling piece 46 is located between the two travel switches 45 and can be respectively in touch control with the two travel switches 45.

The movable die 3 is arranged right below the fixed die 2 and can be buckled with the fixed die 2 relatively to finish injection molding. The outer side walls of the left end and the right end of the movable die 3 are respectively provided with a limiting block mounting groove 31, each limiting block mounting groove 31 is internally fixedly provided with a limiting block 6 through a countersunk bolt, and the limiting blocks are respectively positioned below the core pulling structure 4 on the corresponding side.

As shown in fig. 7, a mounting groove 48 is further provided on the outer side surface of the core drawing seat 43, and a safety hook 5 is correspondingly mounted. Referring to fig. 8, the longitudinal section of the safety hook 5 is L-shaped, wherein a fixing protrusion 53 adapted to the mounting groove 48 is provided at the top end of the vertical rod 51, the extending direction of the fixing protrusion is on the same side as the transverse rod 52 in the safety hook 5, and the fixing protrusion 53 is inserted into the mounting groove 48 and fixed by a countersunk bolt, so that a supporting force can be better given to prevent unhooking; the tail end of the transverse rod 52 in the safety drag hook 5 points to the movable die 3 and is consistent with the sliding direction of the core drawing seat 43; when the movable mold 3 and the fixed mold 2 are closed, the transverse rod 52 is positioned below the limiting block 6. The length of the transverse rod 52 in the safety hook 5 is equal to the interval distance between the two travel switches 45, and compared with the length of the protrusion of the outer side wall of the movable die 3, the spacing distance between the two travel switches 45 is equal to the interval distance between the two travel switches 6, so that the safety hook 5 can be separated from the spacing block 6 when being pulled out.

The specific use principle is as follows: the safety drag hook 5 is fixedly connected with the core pulling seat 43; after injection molding of the product 7 is completed, the hydraulic oil cylinder 42 in the core pulling structure 4 operates to drive the core pulling seat 43 to slide outwards, and the movable core pulling 44 is driven to slide upwards along the upper core pulling hole 22 of the fixed die 2 due to the T-shaped groove 47 at the inner end of the core pulling seat 43, the lower end of the movable core pulling 44 is pulled out from the through hole 8 of the product 7, and at the moment, the core pulling seat 43 drives the safety drag hook 5 to synchronously move outwards, and the transverse rod 52 and the limiting block 6 are gradually separated. When the transverse rod 52 in the safety drag hook 5 is completely separated from the lower part of the limiting block 6, the movable core pulling 44 is simultaneously completely pulled out of the product 7, and the movable mold 3 can be separated from the fixed mold 2 to complete mold opening so as to ensure the integrity of the product 7; as long as the lateral rod 52 is not separated from the lower part of the stopper 6, the movable mold 3 cannot be opened with the fixed mold 2. If the movable core pulling 44 is reset downwards due to improper operation before die assembly, the core pulling seat 43 synchronously drives the safety drag hook 5 to move towards the side of the fixed die, the transverse rod 52 in the safety drag hook 5 is blocked by the limiting block 6, and the movable die 3 cannot be matched with the fixed die 2, so that collision between the movable core pulling 44 and the die cavity is avoided; therefore, the movable core-pulling 44 can be reset only by performing the mold closing operation first.

The related technical features not described in the utility model can be realized by adopting or referring to the prior art.

It should be understood that the above description is not intended to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the particular embodiments disclosed, and that the utility model is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the utility model.

Claims

1. A force safety mechanism for mould loose core, its characterized in that: the movable die is positioned below the fixed die and can be relatively buckled for injection molding; the core pulling structure is arranged at the end side of the fixed die and comprises a fixed support, a hydraulic cylinder, a core pulling seat and a movable core pulling seat, wherein the fixed support is arranged on the outer side wall of the fixed die; the longitudinal section of the safety drag hook is L-shaped, the upper end of the vertical rod of the safety drag hook is fixed at the outer end part of the core drawing seat, and the tail end of the transverse rod of the safety drag hook points to the movable die; a limiting block is fixedly arranged on the outer side wall of the movable die at a position corresponding to the safety drag hook; and when the mold is closed, the limiting block is arranged above the transverse rod in the safety drag hook.

2. The positive locking mechanism for a core-pulling die as defined in claim 1, wherein: the fixing support is U-shaped, and the outer end of the core drawing seat is arranged in a U-shaped cavity of the fixing support; two travel switches are arranged on the upper end surface of one support arm of the fixed support at intervals, a poking plate is fixedly arranged on the outer end of the core drawing seat and the corresponding side of the travel switch, and the poking plate is arranged between the two travel switches.

3. The positive locking mechanism for a core-pulling die as defined in claim 1, wherein: the core pulling structure is provided with two core pulling structures which are respectively and fixedly arranged at two end sides of the fixed die and are arranged in a central symmetry mode.

4. A positive locking mechanism for a core-pulling die as defined in claim 2, wherein: the length of the transverse rod in the safety drag hook is equal to the distance between the two travel switches, and the protruding length of the limiting block compared with the outer side wall of the movable die is equal to the distance between the two travel switches.

5. A positive locking mechanism for a core-pulling die as defined in claim 3, wherein: the two safety draw hooks are respectively fixed at the outer ends of the core drawing seats at the corresponding sides; two limiting blocks are arranged on the movable mould and correspond to the safety drag hooks.

6. The positive locking mechanism for a core-pulling die as defined in claim 1, wherein: the upper end of the vertical rod in the safety drag hook is provided with a fixing lug on one side facing the core drawing seat, the outer end surface of the core drawing seat is provided with a mounting groove matched with the fixing lug, and the upper end of the safety drag hook is fixed in the corresponding mounting groove through a countersunk bolt.

7. The positive locking mechanism for a core-pulling die as defined in claim 1, wherein: a limiting block mounting groove is formed in the outer side wall of the movable die, and one end, close to the movable die, of each limiting block is embedded into the corresponding limiting block mounting groove.

8. The positive locking mechanism for a core-pulling die as defined in claim 1, wherein: the T-shaped groove arranged at the inner end of the core pulling seat is obliquely arranged, and the upper end of the movable core pulling seat is fixedly provided with a T-shaped sliding block which is matched with the T-shaped groove to slide.