CN216804273U - Injection mold with rear mold core first-pulling and secondary-pulling mechanism - Google Patents

Abstract

The utility model discloses an injection mold with a rear mold core first-pulling secondary core-pulling mechanism, which comprises a front mold component, a mold core component, a rear mold component and a secondary core-pulling mechanism, wherein the secondary core-pulling mechanism comprises a driving source, an ejector plate and a transmission part, the output end of the driving source is connected with the ejector plate, and the ejector plate is driven by the driving source to be transmitted to an ejector pin to drive a product to move; the driving source is in transmission connection with the rear template or is disconnected from the rear template through the transmission part; when the core is pulled for the first time, the driving part is in transmission connection with the rear template through the transmission part, and the driving source drives the ejector pins and the rear template to move forward to drive the product and the rear template to move forward synchronously so as to separate the product from the forming column; when the core is pulled secondarily, the driving source is disconnected from the rear template through the transmission part, the driving source drives the ejector pins to move forwards to drive the product to move forwards, and the rear template is fixed, so that the product is separated from the rear template. The utility model has simple structure, reduces the production cost, ensures the demoulding quality and improves the qualification rate of products.

Description

Injection mold with rear mold core first-pulling and secondary-pulling mechanism

Technical Field

The utility model relates to the technical field of molds, in particular to an injection mold with a rear mold core first-pulling and secondary-pulling mechanism.

Background

Injection molding is a processing method used in mass production of some parts, and comprises the specific steps of injecting a material which is melted by heating into a mold cavity from high pressure, and obtaining a molded product after cooling and solidification. The injection mold is a tool used for injection molding, the tool is composed of various parts, different molds are composed of different parts, the processing of the appearance of an object is realized mainly through the change of the physical state of a molded material, and the molding processing of product components in the modern manufacturing industry almost needs to be completed by using the molds.

When some products with irregular shapes and complex shapes are injected, forming structures such as forming columns for assisting in forming undercuts or bulges can be correspondingly extended from the lateral side and the bottom of the mold, the forming columns can obstruct the demolding of the injection products, when the contact area between the forming columns and the products is too large, the condition that the injection products are not easy to eject or damage can occur if a mode of ejecting the ejector pins is directly adopted, the qualification rate of the products is influenced, correspondingly, the core pulling mechanism has a complex structure, the production cost is increased, therefore, a new injection mold needs to be developed, the structure is simple, the production cost is reduced, the demolding quality is ensured, and the qualification rate of the products is improved.

SUMMERY OF THE UTILITY MODEL

Therefore, in order to solve the above problems, the present invention provides an injection mold with a post-mold core first-pulling secondary core-pulling mechanism.

The utility model is realized by adopting the following technical scheme:

a rear mold core firstly-pulling and secondly-pulling injection mold of a core-pulling mechanism comprises a front mold component, a mold core component and a rear mold component, wherein the mold core component is arranged between the front mold component and the rear mold component and is used for forming a product; the rear die assembly comprises a rear die plate, a fixing plate and a rear die seat plate which are sequentially arranged from front to back, a forming column is fixed on the fixing plate, the front side of the forming column extends into the die core assembly, and one side facing the front die assembly is defined as a front side, and the other side facing the rear die assembly is defined as a rear side;

the rear die assembly is provided with a secondary core-pulling mechanism, the secondary core-pulling mechanism comprises a driving source, an ejector plate and a transmission part, the ejector plate is arranged between the fixed plate and the rear die base plate, the output end of the driving source is connected with the ejector plate, the ejector plate is connected with a product through an ejector pin, and the ejector pin is driven by the driving source to drive the product to move; the driving source is in transmission connection with or disconnected from the rear template through the transmission part; during primary core pulling, the driving source is in transmission connection with the rear template through the transmission part, and drives the ejector pins and the rear template to move forwards so as to drive the rear template and the product to move forwards synchronously, so that the product is separated from the forming column; when the secondary is loosed core, the driving source pass through the transmission part disconnection with the transmission of back template is connected, the driving source drive the thimble antedisplacement drives the product antedisplacement, back template is motionless to make the product with back template breaks away from.

Further, the driving connection or disconnection of the driving source and the rear mold plate is triggered and changed through the stroke of the transmission part in the process from primary core pulling to secondary core pulling.

Optionally, the driving connection or disconnection of the driving source and the rear mold plate is triggered and changed through the delay of the transmission part in the process from the primary core pulling to the secondary core pulling.

Furthermore, the transmission part comprises a movable rod and a telescopic block, the rear side of the movable rod is connected with the ejector plate, and the telescopic block is fixedly arranged on the rear template; during primary core pulling, the telescopic block abuts against the movable rod, and the transmission part is in transmission connection with the rear template; the telescopic block retracts and yields in the primary core pulling stroke; when the core is pulled for the second time, the telescopic block is not abutted to the movable rod, and the transmission part is disconnected from the transmission connection of the rear template.

Further, for realizing the flexible of flexible piece, the side of back template has been seted up and has been held the chamber, flexible piece pass through the elastic component activity set up in hold in the chamber, work as when the elastic component receives external force to contract, flexible piece embedding hold in the chamber, work as when the elastic component replies, flexible piece stretches out hold the chamber.

Furthermore, in order to ensure the retraction of the telescopic block, the transmission part is also provided with a limiting block, the limiting block is fixedly arranged on the fixed plate, the appearance of the main body of the limiting block is concave, the opening of the limiting block faces the telescopic block, and openings for the movable rod to pass through are arranged on the front side and the rear side of the limiting block; an inclined part which inclines forwards is formed in the side wall of the limiting block, and the telescopic block abuts against the inclined part when extending out of the accommodating cavity; during primary core pulling, the rear template moves forwards to drive the telescopic block to move forwards along the inclined part, and the telescopic block retracts in a yielding way under the action of the inclined part in the primary core pulling stroke until the telescopic block retracts completely; when the core is pulled for the second time, the movable rod is not abutted to the telescopic block, and the movable rod moves forwards continuously and penetrates through the front end opening of the limiting block.

Furthermore, in order to ensure the distance between the product and the forming column after the core is pulled once, the side wall of the limiting block is positioned at the rear side of the inclined part and is also provided with an abutting channel which is not enough for the telescopic block to be retracted substantially, and the telescopic block can move back and forth along the abutting channel under the action of the movable rod.

Further, for guaranteeing injection moulding product's curb plate shaping, mold core assembly still includes side shaping portion, side shaping portion fixed set up in the side of back template, side shaping portion is including driving actuating cylinder and shaping piece, the output that drives actuating cylinder is connected with the shaping piece, drives through driving actuating cylinder during moulding plastics the shaping piece is close to the shaping post is with supplementary product shaping.

After the scheme is adopted, the utility model has the following beneficial effects: the rear template and the product are driven to synchronously move by the driving source during the primary core pulling, and the acting force acts on the rear template and the product at the same time, so that the stress area is large, the product is easy to separate from the forming column, the situations that the product is difficult to separate from the forming column due to overlarge contact area and overlarge resistance between the product and the forming column are avoided, and the qualification rate of the product is improved; meanwhile, the mold is simple in structure and reduces production cost.

The utility model is described in further detail below with reference to the figures and the specific embodiments.

Drawings

FIG. 1 is a first schematic structural view of an injection molded product;

FIG. 2 is a second schematic view of another angle of the injection molded product;

FIG. 3 is a schematic perspective view of an injection mold according to a first embodiment;

FIG. 4 is a schematic perspective view of a second injection mold according to the first embodiment, in which a portion of the structure is hidden;

FIG. 5 is a cross-sectional view of the injection mold in a clamped state according to the first embodiment;

FIG. 6 is a schematic perspective view of a rear mold assembly according to a first embodiment;

FIG. 7 is a perspective view of another embodiment of a rear mold assembly according to a second embodiment;

FIG. 8 is a schematic structural diagram of a transmission part according to a first embodiment;

FIG. 9 is a schematic structural diagram of a limiting block according to the first embodiment;

FIG. 10 is an exploded view of the telescoping block and rear template according to one embodiment;

FIG. 11 is a schematic view of a first embodiment of a transmission part;

FIG. 12 is a second schematic structural view of the transmission part according to the second embodiment;

FIG. 13 is a first schematic structural view of a transmission portion according to a third embodiment;

fig. 14 is a schematic structural diagram of a transmission part in the third embodiment.

Detailed Description

To further illustrate the various embodiments, the utility model provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

Meanwhile, the directions of front, rear, left, right, and the like referred to in the present embodiment are only used as a reference for one direction, and do not represent directions in actual use.

The utility model will now be further described with reference to the accompanying drawings and detailed description.

Example 1:

referring to fig. 3 to 10, the present embodiment provides an injection mold with a rear mold core first-pulling and second-pulling mechanism, which includes a front mold component 1, a rear mold component 3 and a mold core component 2 located between the front mold component 1 and the rear mold component 3, which are sequentially arranged from front to back and can relatively move; the mold core assembly 2 comprises a front mold core 21 and a rear mold core 22, the front mold core 21 and the rear mold core 22 cover to form an injection molding cavity, and a product is formed in the injection molding cavity. The front mold assembly 1 comprises a front mold plate 11 and a front mold core plate 12, wherein a sprue gate 111 is arranged on the front mold plate 11, a plurality of injection molding runners (not shown in the figure) and a front mold core 21 are arranged on the front mold core plate 12, the injection molding runners are connected with the sprue gate 111, and molten plastics extruded by a plastic extruder flow into the injection molding runners through the sprue gate 111 and enter an injection molding cavity formed by the front mold core 21 and the rear mold core 22, and are solidified and molded after cooling. Rear die assembly 3 includes back template 31, fixed plate 32 and the back bedplate 33 that set gradually from the past backward, and on rear die core 22 located back template 31, be provided with the fashioned shaping post 23 of auxiliary product on the fixed plate 32, the front side of shaping post 23 extends to in the mold core assembly 2. Of course, in other embodiments, the specific structure of the front mold assembly 1 and the rear mold assembly 3 is not limited thereto. In this embodiment, a direction in which the injection mold is fixedly placed on the ground in a use state is taken as a description direction, a side facing the front mold assembly 1 is taken as a front side, a side facing the rear mold assembly 3 is taken as a rear side, a direction in which the front mold assembly 1 is removed from a mold or closed to the mold is defined as a first direction, the first direction is a vertical direction in the drawing, a plane perpendicular to the first direction is defined as a first plane, and the first plane is a horizontal direction in the drawing.

As shown in fig. 1 to 2, the injection molding product 10 has a complex and irregular shape, a circular through hole 101 is formed in the top of the product body 100 along a horizontal direction, the through hole 101 is communicated with the inside of the product body 100, and an inner cavity 102 is formed below the through hole 101 and corresponds to the inside of the product body 100. Correspondingly, the inner cavity 102 and the through hole 101 of the product need to be additionally provided with a molding structure to assist molding. Specifically, in the present embodiment, a rear core plate 221 is fixedly connected to the rear side of the rear mold core 22, and the rear core plate 221 is fixedly locked to the rear mold plate 31, so that the rear mold core 22 is fixedly connected to the rear mold plate 31; and adopt the shaping post 23 to assist the shaping of the inner cavity 102 of the product, the rear side of the shaping post 23 passes the back template 31 and fixedly sets up on the fixed plate 32, there is certain clearance between shaping post 23 and the back template 31, the inner cavity 102 of the product is the clearance part behind front mold core 21 lid to close to back mold core 22 and shaping post 23. The through-hole 101 at product top is by setting up in the supplementary shaping of the side shaping portion 24 of back template 31 side, side shaping portion 24 is including driving actuating cylinder 241 and shaping piece 242, it sets up on back template 31 to drive actuating cylinder 241 fixed, the output that drives actuating cylinder 241 is connected with shaping piece 242, the rear side of shaping piece 242 is corresponding with the shape of injection moulding product main part 100, the top of shaping piece 242 is the cylinder that one set up along the horizontal direction and is connected to the top of back mold core 22, it drives actuating cylinder 241 and drives shaping piece 242 and be close to the shaping of the through-hole 101 of back mold core 22 in order to realize the product. Finally, the front mold core 21, the rear mold core 22, the molding column 23 and the molding block 24 are covered to form an injection molding cavity. During injection molding, the driving cylinder 241 drives the molding block 242 to move along the horizontal direction, the rear side of the molding block 242 abuts against the rear mold core 22, the cylinder of the molding block 242 is connected with the top of the rear mold core 22, the main body female mold 211 covers the front sides of the rear mold core 22, the molding column 23 and the molding block 242 to form an injection molding cavity, molten plastic is injected into the injection molding cavity, and the product is molded after cooling and solidification.

Referring to fig. 6 to 7, the rear mold assembly 3 is provided with a secondary core pulling assembly 4 for driving the molded injection molding product to be separated from the injection molding cavity. In order to ensure the core pulling effect of the secondary core pulling mechanism 4, two identical secondary core pulling mechanisms 4 are symmetrically arranged on two sides of the horizontal plane, and a secondary core pulling mechanism is taken as an example for description. The secondary core-pulling mechanism 4 comprises a driving source 41, an ejector plate 42 and a transmission part 43; the driving source 41 is fixed on two side edges of the fixing plate 32, the ejector plate 42 is arranged between the fixing plate 32 and the rear mold base plate 33, and in a natural state, namely when the ejector plate 42 does not move, the ejector plate 42 abuts against the rear mold base plate 33, the ejector plate 42 is connected with the product 10 through a plurality of ejector pins 44, the output end of the driving source 41 is connected with the ejector plate 42, and the ejector plate 42 is driven by the driving source 41 to drive the product to move back and forth along a first direction. Of course, in other embodiments, the driving source 41 may be connected to the ejector plate 42 in an external connection manner, and the specific connection manner of the product 10 and the ejector plate 42 is not limited thereto.

In order to realize that the transmission connection or disconnection of the driving source 41 and the rear template 31 is triggered and changed through the stroke of the transmission parts 43 in the process from the primary core pulling to the secondary core pulling, the two same transmission parts 43 are symmetrically arranged at the two horizontal sides of the driving source 41, and the transmission parts 43 comprise movable rods 431 and telescopic blocks 432. Referring to fig. 10, the retractable block 432 is fixedly disposed on the side surface of the rear mold plate 31, the retractable block 432 retracts along the horizontal direction under the action of external force, specifically, the side edge of the rear mold plate 31 is provided with an accommodating cavity 311, the accommodating cavity 311 is used for completely embedding the retractable block 432, the accommodating cavity 311 is fixedly provided with the elastic member 312, the tail end of the elastic member 312 is connected with the retractable block 432, the retractable block 432 is completely embedded into the accommodating cavity 311 when the elastic member 312 contracts along the horizontal direction, the elastic member 312 does not contract, that is, the retractable block 432 completely protrudes from the accommodating cavity 311 when the elastic member 312 is in a normal state. The rear end of the movable rod 431 is fixed to the ejector plate 42, and is drivingly connected to the drive source 41, and the movable rod 431 is driven to move by the drive source 41. During the primary core pulling, the elastic piece 312 is in a normal state, the telescopic block 432 protrudes out of the accommodating cavity 311 of the rear mold plate 31, and the front section of the movable rod 431 is abutted with the telescopic block 432, so that when the driving source 41 drives the ejector plate 42 to move forward, the movable rod 431 can be driven and the rear mold plate 31 can be driven to move forward; during secondary core pulling, the elastic member 312 contracts, the telescopic block 432 is embedded into the accommodating cavity 311 of the rear mold plate 31, the movable rod 431 does not abut against the telescopic block 432, the driving source 41 is disconnected from the transmission connection with the rear mold plate 31, when the driving source 41 drives the ejector plate 42 to move forwards, the driving force is transmitted to the movable rod 431, the rear mold plate 31 cannot be driven to move forwards, and at the moment, the rear mold plate 31 does not move relatively.

Referring to fig. 8 to 9, in order to drive the telescopic block 432 to retract, the transmission portion 43 further includes a limiting block 433, the limiting block 433 is fixed on the fixing plate 32, openings for the movable rod 431 to pass through are opened at front and rear sides of the limiting block 433, a main body of the limiting block 433 is concave, the opening of the limiting block 433 faces the telescopic block 432, an inclined portion 4331 inclined forward is opened on a side wall of the limiting block 433, and the telescopic block 432 abuts against the inclined portion 4331. During the primary core pulling, the front side of the movable rod 431 is abutted against the telescopic block 432, and because the direction of the force applied by the movable rod 431 to the telescopic block 432 is vertical and is vertical to the contraction direction of the elastic piece 312, the telescopic block 432 cannot be stretched, and at this time, the movable rod 431 can be driven by the driving source 41 to drive the rear mold plate 31 to move forwards; the front movement of the rear template 31 also drives the telescopic block 432 to move forward along the inclined portion 4331, the inclined portion 4331 has an acting force in the horizontal direction on the telescopic block 432, the acting force is consistent with the contraction direction of the elastic part 312, the telescopic block 432 can recede and retract under the action of the inclined portion 4331 until the telescopic block 432 completely retracts into the accommodating cavity 311, a secondary core pulling stage is carried out, at the moment, the movable rod 431 is not abutted to the telescopic block 432, the movable rod 431 continues to move forward under the driving of the driving source 41 and can pass through the front end opening of the limiting block 433, the driving source 41 is disconnected from the transmission connection with the rear template 31, and the rear template 31 does not move. Further, in order to ensure the distance between the product and the forming post 23 during the primary core pulling, an abutting path 4332 insufficient to substantially retract the telescopic block 432 is further formed below the inclined portion 4331 on the side wall of the limiting block 433, and the abutting path 4432 is in contact with the telescopic block 432 but does not act on the telescopic block 432 so that the telescopic block 432 can move back and forth along the abutting path 4332 under the action of the movable rod 431. The length of the abutment channel 4432, the distance of the telescopic part 432 moving on the inclined part 4331 and the distance of the rear template 31 separating from the forming column 23 in the primary core pulling process; the distance that the telescopic block 432 moves forward after being completely retracted is the distance that the product finally breaks away from the rear mold plate 31 in the secondary core pulling process.

The specific working process of the injection product of the injection mold is as follows:

during injection molding, the driving cylinder 241 drives the forming block 242 to move along the horizontal direction, so that the forming block 242 abuts against the rear mold core 22, a cylinder at the top of the forming block is connected with the top of the rear mold core 22, and the front mold core 21 on the front mold core plate 12 is covered with the rear mold core 22, the forming column 23 and the forming block 242 to form an injection molding cavity; and the molten plastic flows into the injection molding runner from the pouring gate 111 and enters the injection molding cavity, and is solidified and molded after being cooled, so that the injection molding is completed.

During demolding, the front mold assembly 1 moves forwards and drives the front mold core plate 12 to move forwards simultaneously, so that an injection molding cavity formed by the front mold core 21 and the rear mold core 22 is separated, a demolding space of a product is reserved, the driving cylinder 241 drives the forming block 242 to be far away from the rear mold core 22, the forming block 242 is separated from the rear mold core 22, and further separated from the through hole 101 of the product; in the primary core pulling stage, the movable rod 431 is abutted against the telescopic block 432, the driving source 41 is transmitted to the rear template 31, the driving source 41 drives the ejector plate 42 to drive the ejector 44 and the movable rod 431 to move forward so as to synchronously move the rear template 31 and the ejector plate 42 forward, so that the product is separated from the forming column 23 by a certain distance, in the stage, the telescopic block 432 moves forward along the limiting block 433 and continuously retracts under the action of the limiting block 433 until the telescopic block 432 is completely retracted and embedded into the accommodating cavity 311, the movable rod 431 is not abutted against the telescopic block 432, the secondary core pulling stage is entered, the rear template 31 is not connected with the movable rod 431, the driving source 41 cannot transmit to the rear template 31, the driving source 41 drives the ejector plate 42 to drive the ejector 44 and the movable rod 431 to move forward continuously, at the moment, the rear template 31 does not move, only the ejector 44 transmits to the product 10, so that the product 10 moves forward relative to the rear template 31 and the forming column 23, and the final product 10 is completely separated from the forming column 23 and the rear template 31, and (5) demolding the product.

Example 2:

referring to fig. 11 to 12, similar to the transmission portion 43 in embodiment 1, the present embodiment provides another transmission portion 43, which is applied in an injection mold, and the operation principle of the transmission portion 43 is the same as that of the transmission portion 43 in embodiment 1, so that the transmission connection or disconnection between the driving source 41 and the rear mold plate 31 is triggered and changed by the stroke of the transmission portion 43 in the process from the primary core back to the secondary core back, except that the transmission portion 43 has a different structural form:

in this embodiment, the transmission portion 43 has a movable rod 431, a swing rod 432 and a push rod assembly 433, a rear section of the movable rod 431 is fixed on the ejector plate 42 and is connected with the driving source 41 in a transmission manner, the movable rod 431 is driven to move by the driving source 41, a slot 4311 is arranged at the front end of the movable rod 431, a notch 4312 is further arranged at a front section of the movable rod 431, and an inclined guide surface is arranged at the front end and the rear end of the notch 4312. The rear section of the swing rod 432 is hinged to the side surface of the rear template 31, and an abdicating space is formed in the rear template 31 and is used for the swing rod 432 to swing along the horizontal direction; a hook 4321 is arranged at the front end of the swing rod 432, the hook 4321 is fastened on the fastening groove 4311, so that the driving source 41 is in transmission connection with the rear mold plate 31, and during core pulling, the driving source 41 drives the swing rod 432 to move forward when driving the movable rod 431 to move forward, and drives the rear mold plate 31 to move forward. The push rod assembly 433 has a push rod 4331 and a sliding bracket 4332, the push rod 4331 is slidably fitted in the sliding bracket 4332, the sliding bracket 4332 is fixedly disposed (for example, fixed to the fixed plate 32) between the movable rod 431 and the swing rod 432, the rear section of the push rod 4331 always abuts against the inclined guide surface 4311 of the movable rod 431, the inclined guide surface pushes the push rod 4331 to slide in the sliding bracket 4332 along with the forward movement of the movable rod 431, so that the front section of the push rod 4331 abuts against the periphery of the swing rod 432, the swing rod 432 swings to disengage from the snap fit with the movable rod 431, and the secondary core pulling stage is performed, the driving source 41 is disconnected from the transmission connection with the rear mold plate 31, and the driving source 41 cannot drive the swing rod 432 and the rear mold plate 31 to move forward when driving the movable rod 431 to move forward.

Example 3:

referring to fig. 13 to 14, the present embodiment provides another transmission portion 43, which is applied to an injection mold, and the operation principle is that the transmission connection or disconnection between the driving source 41 and the rear mold plate 31 is triggered and changed by the delay of the transmission portion 43 in the process from the primary core back to the secondary core back, which is different from embodiments 1 and 2.

In the embodiment, the transmission part 43 is provided with a movable rod 431 and a telescopic block 432, the rear section of the movable rod 431 is fixed on the ejector plate 42 and is in transmission connection with the driving source 41, and the movable rod 431 is driven to move by the driving source 41; an electromagnet 433 is arranged on the front section surface of the movable rod 431; the expansion block 432 is a bar magnet, and the expansion block 432 is disposed in the side receiving cavity 311 of the rear mold plate 31 through a tension spring. In the primary core pulling stage, the electromagnet 433 is controlled to be electrified, the telescopic block 432 is attracted to extend out and abut against the front end face of the movable rod 431, meanwhile, the tension spring 4321 connected with the telescopic block 432 stores energy, the driving source 43 is in transmission connection with the rear template 31, and the driving source 43 drives the movable rod 431 to move forwards to drive the telescopic block 432 and the rear template 31 to move forwards; in the secondary core pulling stage, the height required by the primary core pulling is reached after a period of forward movement, the electromagnet is controlled to be powered off, the telescopic block 432 retracts and resets under the action of the elastic restoring force of the pull spring 4321, so that the movable rod 431 is not in contact with the telescopic block 432, the transmission connection between the driving source 41 and the rear template 31 is disconnected, and the driving source 41 cannot drive the swinging rod 432 and the rear template 31 to move forward when driving the movable rod 431 to move forward.

It should be noted that the secondary core-pulling mechanism of the present invention may adopt transmission parts with different structural forms and be installed in injection molds with different structural forms according to different application occasions.

By adopting the injection mold provided by the utility model, because the driving source 41 drives the rear mold plate 31 and the product 10 to move forwards relative to the forming column 23 simultaneously during the primary core pulling, the driving force of the driving source 41 acts on the rear mold plate 31 and the product 10, the whole stress area is larger, the product 10 is easily separated from the forming column 23, the stress is uniform in the process, the product 10 is not easily damaged, and the demolding effect of the product 10 is improved; meanwhile, the mold is simple in structure, and the production cost is reduced.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (8)

1. The utility model provides a secondary mechanism injection mold of loosing core is taken out earlier to back mould core which characterized in that: the die core assembly is arranged between the front die assembly and the rear die assembly and is used for forming a product; the rear die assembly comprises a rear die plate, a fixing plate and a rear die seat plate which are sequentially arranged from front to back, a forming column is fixed on the fixing plate, the front side of the forming column extends into the die core assembly, and one side facing the front die assembly is defined as a front side, and the other side facing the rear die assembly is defined as a rear side;

a secondary core-pulling mechanism is arranged on the rear die assembly and comprises a driving source, an ejector plate and a transmission part, the ejector plate is arranged between the fixed plate and the rear die base plate, the output end of the driving source is connected with the ejector plate, the ejector plate is connected with a product through an ejector pin, and the ejector pin is driven by the driving source to drive the product to move; the driving source is in transmission connection with or disconnected from the rear template through the transmission part; during primary core pulling, the driving source is in transmission connection with the rear template through the transmission part, and drives the ejector pins and the rear template to move forwards so as to drive the rear template and the product to move forwards synchronously, so that the product is separated from the forming column; when the secondary is loosed core, the driving source pass through the transmission part disconnection with the transmission of back template is connected, the driving source drive the thimble antedisplacement drives the product antedisplacement, back template is motionless to make the product with back template breaks away from.

2. The injection mold with the post-mold core first-pulling secondary core-pulling mechanism according to claim 1, characterized in that: the driving connection or disconnection of the driving source and the rear template is triggered and changed through the stroke of the transmission part in the process from primary core pulling to secondary core pulling.

3. The injection mold with the post-mold core first-pulling secondary core-pulling mechanism according to claim 1, characterized in that: the driving connection or disconnection of the driving source and the rear template is triggered and changed through the time delay of the driving part in the process from primary core pulling to secondary core pulling.

4. The injection mold with the post-mold core for the secondary core-pulling mechanism according to claim 2, wherein: the transmission part comprises a movable rod and a telescopic block, the rear side of the movable rod is connected with the ejector plate, and the telescopic block is fixedly arranged on the rear template; during primary core pulling, the telescopic block abuts against the movable rod, and the transmission part is in transmission connection with the rear template; when the secondary is loosed the core, flexible piece is at the stroke of once loosing core and is retracted and abdicate, flexible piece with the movable rod does not butt, transmission portion break off with the transmission of back template is connected.

5. The injection mold with the post-mold core for the secondary core-pulling mechanism according to claim 4, wherein: the side of back template has been seted up and has been held the chamber, flexible piece through the elastic component activity set up in hold in the chamber, when the elastic component receives external force to contract, flexible piece embedding hold in the chamber, when the elastic component replies, flexible piece stretches out hold the chamber.

6. The injection mold with the post-mold core for the secondary core-pulling mechanism according to claim 5, wherein: the transmission part is also provided with a limiting block, the limiting block is fixedly arranged on the fixed plate, the appearance of the limiting block main body is concave, the opening of the limiting block faces the telescopic block, and openings for the movable rod to pass through are formed in the front side and the rear side of the limiting block; an inclined part which inclines forwards is formed in the side wall of the limiting block, and the telescopic block abuts against the inclined part when extending out of the accommodating cavity; during primary core pulling, the rear template moves forwards to drive the telescopic block to move forwards along the inclined part, and the telescopic block retracts in a yielding way under the action of the inclined part in the primary core pulling stroke until the telescopic block retracts completely; when the core is pulled for the second time, the movable rod is not abutted to the telescopic block, and the movable rod moves forwards continuously and penetrates through the front end opening of the limiting block.

7. The injection mold with the rear mold core first-pulling secondary core-pulling mechanism according to claim 6, characterized in that: the side wall of the limiting block is positioned at the rear side of the inclined part and is also provided with an abutting channel which is not enough for the telescopic block to be retracted substantially, and the telescopic block can move back and forth along the abutting channel under the action of the movable rod.

8. The injection mold with the post-mold core first-pulling secondary core-pulling mechanism according to claim 1, characterized in that: mold core assembly still includes side shaping portion, side shaping portion fixed set up in the side of back template, side shaping portion is including driving actuating cylinder and shaping piece, the output that drives actuating cylinder is connected with the shaping piece, drives through driving actuating cylinder during moulding plastics the shaping piece is close to the shaping post is in order to assist the product shaping.

Images