CN107662314A - A kind of full-automatic demoulding mould of Plastic Parts with Inner Thread - Google Patents

Abstract

The invention discloses a fully automatic demoulding mold for plastic parts with internal threads, which comprises a fixed mold cavity plate and a movable mold cavity plate. The lower end of the plate is connected to the backing plate, and the movable seat plate is set under the backing plate; the sprue sleeve is set on the top of the fixed seat plate, the main flow channel is set on the parting surface, the main flow channel is connected to the product cavity, and the product cavity is provided with a threaded core The threaded core runs through the movable model cavity plate and extends into the backing plate. A hydraulic motor is provided in the movable seat plate. The lower end of the threaded core is connected with the hydraulic motor through a transmission mechanism, and the hydraulic motor drives the threaded core to rotate. In the invention, the hydraulic motor is placed between the backing plate and the fixed plate of the movable mold, which saves mold space and has low requirements on the tonnage of the injection molding machine. The driving gear is used to drive multiple driven gears for demoulding, and the cavity can be fully designed according to the template space. The anti-rotation mechanism is used to ensure that the plastic parts are automatically unscrewed, and the spring is used to push the material head out, which is convenient for adjustment and maintenance.

Description

A fully automatic demoulding mold for internal thread plastic parts

technical field

The invention relates to the field of injection molding, in particular to a fully automatic demoulding mold for plastic parts with internal threads.

Background technique

Mold is an important technological foundation of the manufacturing industry. With the accelerated pace of my country's mold and international standards, and the increasingly intensified market competition, people have put forward higher requirements for the quality, production efficiency and service life of mold injection molding products. In particular, the internal thread spin-off mold is in urgent need of further development and perfection. As an important connection method, threaded connection is widely used in mold injection molding products. The length of core-entry and core-pulling time for internal thread spin-off mold directly affects the production efficiency of the mold.

Patent Publication No. CN104149292A discloses an injection mold structure for rapid demoulding of threaded plastic parts, which mainly includes a fixed template, a movable template, a backing plate and a set of unscrewing mechanisms. The rotation of the main gear drives the driven gear to rotate, and the externally threaded cylinder connected to the driven gear is unscrewed to realize the rapid demoulding of the plastic part. A pre-compressed spring is provided between the moving template and the backing plate, one end of the sleeve sleeve is attached to the ejector plate, and the other end abuts against the injection-molded product for ejecting the product. However, the layout of the hydraulic motor in this invention is unreasonable, and the space of the mold cannot be fully utilized. At the same time, the push rod and the push plate are used to eject the plastic part, and the ejection mechanism is not direct enough.

Utility Model Authorized Notice No. CN202826286U discloses an automatic demoulding mechanism for internal threads of injection molds. The automatic demoulding mechanism for internal threads of injection molds includes an upper template and a lower template. Install a backing plate on the formwork, install a bearing fixing plate on the backing plate, install a stripper plate on the bearing fixing plate, connect a fixed core on the backing plate, set a rotating core outside the fixed core, install a large sprocket and a pad outside the rotating core The outer side of the bearing fixing plate is provided with an oil motor installation seat, the oil motor is installed on the oil motor installation seat, and a small sprocket is installed on the rotating shaft of the oil motor. The small sprocket and the large sprocket are driven by a chain. the spring. The driving device of the utility model is also provided separately from the mould, which results in a larger overall volume of the mould, lower equipment manufacturing cost and comprehensive utilization rate.

The common rack and pinion thread stripping mechanism is prone to impact on the rack and pinion during the working process, and is limited by the template, the number of cavities cannot be too many, and bevel gear processing is more difficult. Existing screw thread automatic demoulding technology mostly uses ejector pins, push blocks or push plates to push out plastic parts, and pulls out material heads with pull hooks. The mold structure is complex and the space cannot be fully utilized.

Contents of the invention

The purpose of the invention is to design a fully automatic demoulding mold for plastic parts with internal threads.

In order to achieve the purpose of the above invention, the technical solution of the present invention is: a fully automatic demoulding mold for internal threaded plastic parts, including a fixed mold cavity plate and a movable mold cavity plate, the fixed mold cavity plate is arranged above the movable mold cavity plate, and the fixed mold cavity plate There is a parting surface for plastic parts between the cavity plate and the cavity plate of the movable model. The upper surface of the cavity plate of the fixed model is provided with a seat plate. The lower end surface of the cavity plate of the movable model is connected to a backing plate. Seat plate, the fixed seat plate is fixedly connected with the fixed model cavity plate, and the movable model cavity plate, backing plate, and movable seat plate are fixedly connected in sequence;

The top of the seat plate is provided with a sprue sleeve, and the sprue sleeve penetrates downward to the parting surface of the lower end surface of the cavity plate of the fixed mold. , the main flow channel is connected with at least one product cavity, and a threaded core is provided in the product cavity; the threaded core penetrates the movable model cavity plate and extends into the backing plate, and a hydraulic motor is arranged in the movable seat plate, and the threaded core The lower end is connected to the hydraulic motor through the transmission mechanism, and the hydraulic motor drives the threaded core to rotate;

The bottom of the sprue sleeve is provided with an elastic pushing device; the movable mold cavity plate is provided with a hole core extending into the product cavity, and the hole core is arranged on one side of the threaded core; A guide hole is provided, and a guide pin is provided on the moving model cavity plate, and the guide pin cooperates with the guide hole to realize the positioning of the fixed model cavity plate and the moving model cavity plate.

The lower end surface of the moving model cavity plate is provided with a stepped hole, and the stepped surface of the stepped hole is provided with a hole core installation hole, and the hole core is installed in the hole core installation hole, and a centripetal hole is installed in the step hole. The hole core is fixed and blocked by the radial bearing; the upper surface of the backing plate is provided with a transmission chamber, and the bottom of the transmission chamber is provided with a centripetal thrust bearing, and the centripetal thrust bearing is coaxially arranged with the centripetal bearing. The threaded core is installed through a radial bearing and a radial thrust bearing, the transmission mechanism is located in a transmission cavity, and the transmission cavity is sealed by a cover plate.

The hydraulic motor is arranged vertically, the power output shaft is vertically upward, the upper end of the power output shaft is equipped with a driving gear, and the bottom end of the threaded core is equipped with a driven gear, and the driving gear and the driven gear are meshed for transmission.

There are four product cavities, which are distributed along the circumferential direction and respectively communicated with the main channel. Each product cavity is respectively provided with a threaded core. The driving gear meshes with four driven gears at the same time, and the driving gear drives the four driven gears. The driven gears rotate synchronously.

The movable seat plate includes a bottom plate, which supports the hydraulic motor, and a support portion is arranged on the bottom plate, and the support portion is evenly distributed around the hydraulic motor, and the top end of the support portion is connected to the lower end surface of the backing plate, and the bottom plate, the connecting portion , The backing plate is fixedly connected by long bolts.

The beneficial effects of the present invention are:

1. Placing the hydraulic motor between the backing plate and the fixed plate of the movable mold saves mold space, reduces costs, and has low requirements for the tonnage of the injection molding machine, which has great advantages.

2. The driving gear is used to drive multiple driven gears for demoulding, and the cavity can be fully designed according to the template space.

3. A hydraulic motor is placed at the position of the original push rod and pull hook, and the anti-rotation mechanism is used to ensure the automatic rotation of the plastic part, and the spring is used to push the material head out, which is convenient for adjustment and maintenance.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of a top-view cross-sectional structure of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, a fully automatic demoulding mold for internally threaded plastic parts includes a fixed mold cavity plate 1 and a movable mold cavity plate 2, the fixed mold cavity plate 1 is arranged above the movable mold cavity plate 2, and the fixed mold cavity plate A parting surface 3 of the plastic part is provided between the plate 1 and the movable model cavity plate 2, the upper end surface of the fixed model cavity plate 1 is provided with a seat plate 4, and the lower end surface of the movable model cavity plate 2 is connected to a backing plate 5, A movable seat plate 6 is arranged below the backing plate 5, the fixed seat plate 4 is fixedly connected with the fixed model cavity plate 1, and the movable model cavity plate 2, the backing plate 5, and the movable seat plate 6 are fixedly connected in sequence.

The top of the seat plate 4 is provided with a sprue sleeve 7, and the sprue sleeve 7 penetrates downward to the parting surface 3 of the lower end surface of the cavity plate 1 of the fixed mold. The parting surface 3 is provided with a main channel 8, and the main channel 8 and the The main runner 9 of the sprue sleeve 7 is connected, and the main runner 8 is connected with four product cavities 10, and each product cavity 10 is respectively provided with a threaded core 11; the end of the threaded core 11 penetrates the movable model cavity plate 2 and extends to the backing plate 5. The bottom of the sprue bushing 7 is provided with an elastic pushing device 27 for ejecting the material head.

In order to improve production efficiency and equipment utilization, the general mold adopts the form of one mold with multiple cavities, and the present invention adopts the common one mold with four cavities, but in terms of the design idea of the present invention, the present invention can completely realize one mold with one cavity Or a multi-cavity injection molding requirement.

Described moving model cavity plate 2 is provided with the hole core 18 that stretches into product cavity 10, and hole core 18 is arranged on thread core 11 side, and the lower end surface of moving model cavity plate 2 is provided with step hole 19, and step hole 19 A hole core installation hole 20 is provided on the stepped surface of the hole type core, and the hole type core 18 is installed in the hole type core installation hole 20 . A radial bearing 21 is installed in the stepped hole 19 , and the hole core 18 is fixedly blocked by the radial bearing 20 . Utilize the circumferential binding force of the hole core 18 on the product as a product stop rotation device during demoulding.

The upper end surface of the backing plate 5 is provided with a transmission chamber 22, the bottom of the transmission chamber 22 is provided with a centripetal thrust bearing 23, the centripetal thrust bearing 23 is coaxially arranged with the centripetal bearing 21, and the threaded core 11 passes through the centripetal thrust bearing 23. Bearing 21 and centripetal thrust bearing 23 are installed, and centripetal bearing 21 is used for bearing the radial force of threaded core 11, avoids threaded core 11 and moving model cavity plate direct friction, and centripetal thrust bearing 23, in addition to being able to bear radial force In addition to the force, it can also withstand the axial thrust of the threaded core 11 during the injection molding process. The transmission mechanism is located in the transmission cavity 22 , and the transmission cavity 22 is sealed by a cover plate 24 .

The fixed model cavity plate 1 is provided with a guide hole 25, and the movable model cavity plate 2 is provided with a guide pin 26, and the guide pin 26 cooperates with the guide hole 25 to realize the fixed model cavity plate 1 and the movable model cavity plate 2 positioning.

A hydraulic motor 12 is arranged inside the movable seat plate 6 . The movable seat plate 6 includes a base plate 15, which supports the hydraulic motor 12, and a support portion 16 is also provided on the base plate 15, and the support portion 16 is evenly distributed around the hydraulic motor 12, and the top end of the support portion 16 is connected to the backing plate 5. On the lower end face, the bottom plate, connecting portion, and backing plate are fixedly connected by long bolts. The hydraulic motor 12 is vertically arranged on the base plate 15, the power output shaft 13 is vertically upward, and the upper end of the power output shaft 13 is equipped with a driving gear 14. The bottom end of the threaded core 11 is equipped with a driven gear 17, the driving gear 14 is meshed with the driven gear 17 for transmission, the driving gear 14 is meshed with four driven gears 17 at the same time, and the driving gear 14 drives the four driven gears 17 rotate synchronously, and the hydraulic motor 12 drives the threaded core 11 to rotate.

The demoulding of this invention adopts hydraulic motor 12 as demoulding driving force, and hydraulic motor 12 drives driving gear 14, and driving gear 14 drives driven gear 17, and driven gear 17 drives threaded core 11 to rotate, at the end of hole core 18 Automatic demoulding of internal threaded plastic parts is realized under the action of rotation. The hydraulic motor 12 can be directly controlled by the injection molding machine module to realize hydraulic speed regulation, so as to realize the control of the unscrewing speed of demoulding.

The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Claims (5)

1. A fully automatic demoulding mold for internal threaded plastic parts is characterized in that it comprises a fixed model cavity plate and a moving model cavity plate, the fixed model cavity plate is arranged above the moving model cavity plate, and the fixed model cavity plate and the moving model cavity plate There is a parting surface for plastic parts between them, the upper surface of the fixed model cavity plate is provided with a fixed seat plate, the lower end surface of the movable model cavity plate is connected to a backing plate, and a movable seat plate is provided under the backing plate, and the fixed seat plate The plate is fixedly connected to the fixed model cavity plate, and the movable model cavity plate, backing plate, and movable seat plate are fixedly connected in sequence; The top of the seat plate is provided with a sprue sleeve, and the sprue sleeve penetrates downward to the parting surface of the lower end surface of the cavity plate of the fixed mold. , the main flow channel is connected with at least one product cavity, and a threaded core is provided in the product cavity; the threaded core penetrates the movable model cavity plate and extends into the backing plate, and a hydraulic motor is arranged in the movable seat plate, and the threaded core The lower end is connected to the hydraulic motor through the transmission mechanism, and the hydraulic motor drives the threaded core to rotate; The bottom of the sprue sleeve is provided with an elastic pushing device; the movable mold cavity plate is provided with a hole core extending into the product cavity, and the hole core is arranged on one side of the threaded core; A guide hole is provided, and a guide pin is provided on the moving model cavity plate, and the guide pin cooperates with the guide hole to realize the positioning of the fixed model cavity plate and the moving model cavity plate. 2. The fully automatic demoulding mold for internally threaded plastic parts according to claim 1, characterized in that, the lower end surface of the movable mold cavity plate is provided with a stepped hole, and the stepped surface of the stepped hole is provided with a hole core mounting hole, The hole core is installed in the hole core installation hole, a radial bearing is installed in the stepped hole, and the hole core is fixed and blocked by the radial bearing; the upper surface of the backing plate is provided with a transmission cavity, and the bottom of the transmission cavity A centripetal thrust bearing is provided, and the centripetal thrust bearing is arranged coaxially with the centripetal bearing, the threaded core is installed through the centripetal bearing and the centripetal thrust bearing, the transmission mechanism is located in the transmission cavity, and the transmission cavity Sealed through the cover plate. 3. The fully automatic demoulding mold for internally threaded plastic parts according to claim 1, wherein the hydraulic motor is vertically arranged, the power output shaft is vertically upward, and a driving gear is installed at the upper end of the power output shaft, so that A driven gear is installed at the bottom end of the threaded core, and the driving gear is engaged with the driven gear for transmission. 4. The fully automatic demoulding mold for internal threaded plastic parts according to any one of claims 1-3, characterized in that there are four product cavities distributed along the circumference and communicated with the main channel respectively, each product cavity A threaded core is respectively arranged in the cavity, and the driving gear meshes with four driven gears at the same time, and the driving gear drives the four driven gears to rotate synchronously. 5. The fully automatic demoulding mold for internally threaded plastic parts according to claim 1, wherein the movable seat plate includes a base plate, which supports the hydraulic motor, and a support portion is arranged on the base plate, and the support portions are evenly distributed Around the hydraulic motor, the top end of the supporting part is connected to the lower end surface of the backing plate, and the bottom plate, the connecting part and the backing plate are fixedly connected by long bolts.