CN209851502U - Tooth-twisting core-withdrawing mechanism and die - Google Patents

Abstract

The application relates to the technical field of injection molding, in particular to a tooth-twisting core-withdrawing mechanism and a mold, which comprise a rack, a gear, a central shaft, a guide sleeve, a first insert and a first insert pin; the central shaft is of a hollow structure, the gear is coaxially arranged on the central shaft and is meshed with the rack, and one end of the gear shaft is provided with a thread; the central shaft is coaxially connected with the guide sleeve; the first insert is arranged in the central shaft, and an exhaust channel is arranged on the first insert; the first insert pin is arranged in the first insert, an exhaust groove is axially formed in the first insert pin, and the exhaust groove is communicated with the exhaust channel. The die comprises a die box and a plurality of the tooth twisting and core withdrawing mechanisms; and a plurality of twisting tooth core-withdrawing mechanisms are arranged on the die box. The rack is directly meshed with the gear, so that the transmission abrasion of the gear is reduced; the central shaft is coaxially connected with the guide sleeve, so that the central shaft can be guided and withdrawn conveniently, and the abrasion of the central shaft is reduced; the exhaust channel is communicated with the exhaust groove, so that air in the mold is exhausted, and the rubber body in the cavity is molded.

Description

Tooth-twisting core-withdrawing mechanism and die

Technical Field

The application relates to the technical field of injection molding, in particular to a tooth twisting and core retreating mechanism and a mold.

Background

In the prior art, core withdrawing mechanisms formed by injection molding are mutually transmitted by a plurality of gears, the gears are difficult to avoid abrasion after long-term production, accumulated gaps of the gears are increased, and the heights of the screw teeth of the products are inconsistent; the copper tooth socket is arranged at the core withdrawing position, sometimes the tooth is not withdrawn to the position or the product is not taken out, so that the copper tooth socket is often crushed, the time for repairing the mold each time is long, and the cost is higher; the mold insert of the mold has more movements and is easy to rub and damage.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a tooth-twisting core-withdrawing mechanism and a die, wherein a rack is directly meshed with a gear, so that gear transmission abrasion is reduced; the central shaft is coaxially connected with the guide sleeve, so that the central shaft can be guided and withdrawn conveniently, and the abrasion of the central shaft is reduced; the exhaust channel is arranged on the first insert, the exhaust groove is axially arranged on the first insert, and the exhaust groove is communicated with the exhaust channel to exhaust air in the mold so as to form the colloid in the cavity.

In a first aspect, an embodiment of the application provides a tooth-twisting core-withdrawing mechanism, which comprises a rack, a gear, a central shaft, a guide sleeve, a first insert and a first insert pin;

the central shaft is of a hollow structure, the gear is coaxially arranged on the central shaft and meshed with the rack, and one end of the central shaft is provided with a thread;

the central shaft is coaxially connected with the guide sleeve;

the first insert is arranged in the central shaft, and an exhaust channel is arranged on the first insert;

the first insert pin is arranged in the first insert, an exhaust groove is formed in the first insert pin in the axial direction, and the exhaust groove is communicated with the exhaust channel.

With reference to the first aspect, an embodiment of the present application provides a first possible implementation manner of the first aspect, where: the connecting surface between the central shaft and the guide sleeve is a conical surface.

With reference to the first aspect, an embodiment of the present application provides a second possible implementation manner of the first aspect, where: the guide sleeve comprises a first guide sleeve and a second guide sleeve;

the first guide sleeve and the second guide sleeve are coaxially arranged, and the lower end face of the first guide sleeve is connected with the upper end face of the second guide sleeve.

With reference to the second possible implementation manner of the first aspect, an embodiment of the present application provides a third possible implementation manner of the first aspect, where: the second insert, the ejector rod and the second insert pin are further included;

the second insert is mounted in the second guide sleeve;

the ejector rod is arranged in the second insert;

the second insert pin is installed in the ejector rod.

With reference to the first aspect, an embodiment of the present application provides a fourth possible implementation manner of the first aspect, where: a plurality of bearings are arranged along the axial direction of the central shaft.

With reference to the first aspect, an embodiment of the present application provides a fifth possible implementation manner of the first aspect, where: one end of the rack, which is far away from the central shaft, is connected with a driving piece.

With reference to the fifth possible implementation manner of the first aspect, an embodiment of the present application provides a sixth possible implementation manner of the first aspect, where: the driving piece is an oil cylinder, an air cylinder or a motor.

With reference to the first aspect, an embodiment of the present application provides a seventh possible implementation manner of the first aspect, where: the exhaust groove is a ring groove.

With reference to the seventh possible implementation manner of the first aspect, an embodiment of the present application provides an eighth possible implementation manner of the first aspect, where: the exhaust channel comprises an exhaust hole and a guide groove;

the ring groove is communicated with the exhaust hole;

the guide groove is arranged along the axial direction of the first insert, and the axial direction of the exhaust hole is vertical to the axial direction of the first insert;

one end of the guide groove is communicated with the exhaust hole, and the other end of the guide groove is communicated with the outside.

In a second aspect, embodiments of the present application provide a mold comprising a mold box and a plurality of the tooth-twisting and core-withdrawing mechanisms as described in any one of the above;

and the plurality of tooth twisting and core withdrawing mechanisms are arranged on the mould box.

According to the tooth twisting and core withdrawing mechanism and the die, the rack is directly meshed with the gear, so that gear transmission abrasion is reduced; the central shaft is coaxially connected with the guide sleeve, so that the central shaft can be guided and withdrawn conveniently, and the abrasion of the central shaft is reduced; the exhaust channel is arranged on the first insert, the exhaust groove is axially arranged on the first insert, and the exhaust groove is communicated with the exhaust channel to exhaust air in the mold so as to form the colloid in the cavity.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a mold provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a tooth-twisting core-withdrawing mechanism provided in an embodiment of the present application;

FIG. 3 is a cross-sectional view of a mold provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a central shaft of a tooth-twisting core-withdrawing mechanism provided in an embodiment of the present application;

fig. 5 is a schematic assembly diagram of a first insert and a first insert pin of a tooth-twisting core-stripping mechanism provided in an embodiment of the present application.

Reference numerals:

101: a rack; 102: a gear; 103: a central shaft; 104: a thread; 105: a first insert; 106: a first insert pin; 107: a second insert pin; 108: a top rod; 109: a second insert; 110: a deep groove ball bearing; 201: a first guide sleeve; 202: a second guide sleeve; 301: a mold box; 401: a drive member; 501: a ring groove; 502: an exhaust hole; 503: and a guide groove.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

As shown in fig. 1-5, the present application provides a tooth-twisting and core-withdrawing mechanism, in which a rack 101 is directly engaged with a gear 102, so as to reduce transmission wear of the gear 102; the central shaft 103 is coaxially connected with the guide sleeve, so that the central shaft 103 can be conveniently withdrawn in a guiding way, the accuracy of movement is ensured, and the abrasion of the central shaft 103 is reduced; the first insert 105 is provided with an exhaust channel, the first insert pin 106 is provided with an exhaust groove in the axial direction, and the exhaust groove is communicated with the exhaust channel to exhaust air in the mold, so that the glue in the mold cavity is molded.

Specifically, in the present embodiment, as shown in fig. 2, the tooth-twisting core-loosening mechanism includes a rack 101, a gear 102, a central shaft 103, a guide bush, a first insert 105, and a first insert pin 106. The central shaft 103 is a hollow structure, the gear 102 is coaxially arranged on the central shaft 103, and here, the gear 102 and the central shaft 103 are integrally made into a gear shaft, so that the connection strength between the gear 102 and the central shaft 103 is ensured, and further, the gear 102 drives the central shaft 103 to rotate.

Specifically, in the present embodiment, as shown in fig. 3 to 4, the gear 102 is engaged with the rack 101, and the rack 101 is driven to move linearly to drive the gear 102 to rotate, so as to drive the central shaft 103 to rotate, wherein one end of the central shaft 103 is provided with a thread 104. After the injection molding product is cooled and molded, the injection molding product has enough strength and rigidity, the threads 104 of the central shaft 103 are matched with the molding threads on the product, when the central shaft 103 rotates, axial thrust is generated between the molding threads on the product and the threads 104 of the central shaft 103, and the central shaft 103 is withdrawn, so that the purpose of twisting and withdrawing the core is achieved.

Specifically, in the present embodiment, as shown in fig. 2, the center shaft 103 is coaxially connected with the guide sleeve. When the center shaft 103 withdraws from, cause wearing and tearing very easily, the life of center shaft 103 has been reduced, and because frictional resistance leads to withdrawing the core difficulty, in this embodiment, at the outer coaxial arrangement guide pin bushing of center shaft 103, the inner wall precision of guide pin bushing is high, and the roughness is little, greatly reduced the wearing and tearing of center shaft 103 when withdrawing the core, reduce the slip frictional force of center shaft 103 and guide pin bushing, and the fitting surface sets to the conical surface, effectively reduced friction angle and frictional force, guarantee to withdraw the smooth of core.

Specifically, in the present embodiment, as shown in fig. 2 and 5, the first insert 105 is disposed in the hollow structure of the central shaft 103, and is used for injection molding of a product, and is connected in a shaft-hole fitting manner, and the first insert 105 is provided with an exhaust passage for guiding compressed air inside the cavity to be exhausted out of the cavity during molding, so as to mold a glue in the cavity. The first insert pin 106 is disposed in the first insert 105 and coupled thereto by a shaft hole fitting manner, and an exhaust groove is formed in the axial direction of the first insert pin 106 to ensure that air in the cavity can be stably and uniformly exhausted. The exhaust groove is communicated with the exhaust channel, and air in the cavity is exhausted out of the mold through the exhaust groove and the exhaust channel.

In this embodiment, as shown in fig. 2, the connecting surface between the central shaft 103 and the guide sleeve is a tapered surface, which replaces the copper facing of the prior art, and avoids the problem that the copper facing is crushed frequently due to the tooth failing to move back to the position or the product failing to be taken out. This embodiment has effectively reduced the friction angle, and the normal pressure that the perpendicular to was connected the face reduces, therefore the frictional force between center pin 103 and the guide pin bushing reduces, guarantees the smoothness of moving back the core, and reduces the wearing and tearing of center pin 103, has effectively improved the life of center pin 103, reduce cost.

In this embodiment, as shown in fig. 2, the guide sleeve is used in cooperation with the central shaft 103 and the second insert 109 to play a guiding role, and the fit clearance is generally small and within 0.05mm, and generally, the guide sleeve is generally used in a mold or some machines to ensure the accuracy of movement.

Specifically, in this embodiment, the guide sleeve includes a first guide sleeve 201 and a second guide sleeve 202, the first guide sleeve 201 and the second guide sleeve 202 are coaxially disposed, a lower end of the first guide sleeve 201 is a groove surface, an upper end surface of the second guide sleeve 202 is a boss surface, and the groove surface of the first guide sleeve 201 and the boss surface of the second guide sleeve 202 are in high-precision fit, so that the sealing performance of the glue position of the product and the stability of the core removal are ensured.

Specifically, in this embodiment, the second guide sleeve 202 is used for product injection molding, and is a hollow structure, and the inside of the hollow structure is designed to be the product shape profile, so that the guide is realized and the product molding is performed at the same time.

In this embodiment, as shown in fig. 2, the tooth-twisting and core-withdrawing mechanism further includes a second insert 109, a top rod 108 and a second insert 107, the second insert 109 is installed in the second guide sleeve 202, and is used for injection molding of a product, and is also used for fixing and guiding the top rod 108, the top rod 108 is installed in the second insert 109, and after the mold is opened, the product is ejected from the rear mold through the top rod 108, thereby completing the injection molding. The second insert 107 is mounted in a top bar 108, the second insert 107 is used for injection molding of a product, and the top bar 108 is used for fixing and guiding the second insert 107.

In the present embodiment, as shown in fig. 2, a plurality of bearings are provided along the axial direction of the center shaft 103. The bearing is an important part in the modern mechanical equipment. Its main function is to support the mechanical rotator, reduce the friction coefficient in its motion process and ensure its rotation precision. The bearing mainly comprises a sliding bearing, a joint bearing and a rolling bearing, wherein the rolling bearing comprises a deep groove ball bearing 110, an angular contact ball bearing, a self-aligning ball bearing, a thrust ball bearing, a two-way thrust angular contact ball bearing, a thrust roller bearing, a needle roller bearing, an outer spherical ball bearing, a self-aligning roller bearing, a flange bearing with a seat bearing, a combined bearing linear bearing and the like.

Here, the deep groove ball bearing 110 provided on the center shaft 103 is a rolling bearing which is most widely used, and is an original single-row radial ball bearing. The deep groove ball bearing 110 can bear radial load of the central shaft 103, and can also bear radial load and axial load simultaneously. When it is subjected to only radial loads, the contact angle is zero. When the deep groove ball bearing 110 has a large radial play, the deep groove ball bearing has the performance of an angular contact bearing, can bear a large axial load, and has a small friction coefficient and a high limit rotation speed of the deep groove ball bearing 110.

The deep groove ball bearing 110 is the most commonly used rolling bearing. It has simple structure and convenient use. The bearing mainly bears the radial load of the central shaft 103, but when the radial play of the bearing is increased, the bearing has certain performance of an angular contact ball bearing and can bear the combined radial and axial load. When the rotating speed is high and the thrust ball bearing is not suitable to be adopted, the thrust ball bearing can be used for bearing pure axial load. Compared with other types of bearings with the same specification and size as the deep groove ball bearing 110, the bearing has the advantages of small friction coefficient and high limit rotating speed. However, since the center shaft 103 is designed to be lightweight and is not suitable for receiving a heavy load due to its impact resistance, the deep groove ball bearing 110 is preferably used.

When the deep groove ball bearing 110 is mounted on the center shaft 103, axial displacement in both directions of the center shaft 103 or the housing can be restricted within the axial play range of the bearing, and thus axial positioning can be performed in both directions. In addition, the bearing has certain aligning capability, and can still work normally when the bearing is inclined by 2 'to 10' relative to the shell hole, but has certain influence on the service life of the bearing.

In this embodiment, as shown in fig. 3, the top ends of a plurality of racks 101 are fixed on the sliding block through bolts, two ends of the sliding block are installed on the sliding rail of the supporting frame, the bottom end of the supporting frame is fixed on the mold box 301, an end cover is installed on the top end of the supporting frame, one end of the rack 101, which is far away from the central shaft 103, is connected with a driving part 401, the driving part 401 is fixed on the end cover and is connected with the sliding block, the supporting frame and the end cover are used for supporting the driving part 401, the driving part 401 can drive the sliding block to move linearly, thereby driving the rack 101 to move linearly, the gear. It should be noted that the supporting frame has a sufficient height, and the rack 101 has a sufficient length to ensure that the mold opening stroke is sufficient for the central shaft 103 to retreat to the designated position.

In this embodiment, as shown in fig. 3, the driving member 401 is an oil cylinder, which is one of hydraulic cylinders, and is a hydraulic actuator capable of converting hydraulic energy into mechanical energy to drive the slider and the rack 101 to reciprocate linearly. It has simple structure and reliable operation. When the reciprocating motion is realized by using the device, a speed reducing device can be omitted, no transmission gap exists, the motion is stable, and the stability of the withdrawing of the twisted teeth is effectively ensured. The output force of the hydraulic cylinder is in direct proportion to the effective area of the piston and the pressure difference between the two sides of the effective area; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder cover, a piston and a piston rod, a sealing device, a buffering device and an exhaust device. It should be noted that, in the present embodiment, it is not limited to only one driving manner of the oil cylinder, but also the motor may drive the gear 102 to perform chain transmission, or adopt a pulley block lifting manner, etc., as long as the stability of the linear motion of the rack 101 is ensured.

In this embodiment, as shown in fig. 5, the exhaust groove is an annular groove 501, and air can be guided into the annular groove 501 from the annular direction, so as to ensure uniformity, stability and comprehensiveness of exhaust, thereby preventing the first insert pin 106 from moving due to air flow, affecting the quality of injection molding, avoiding abrasion of the first insert pin 106, and improving the service life of the first insert pin 106. The ring-opening groove 501 is formed in the first insert pin 106, so that the first insert pin 106 can be reduced in weight and facilitated in core removal. It should be noted that the number of the annular grooves 501 may be plural, and the number may be designed according to the specific exhaust requirement, as long as the exhaust effect is achieved.

In this embodiment, as shown in fig. 5, the exhaust passage includes an exhaust hole 502 and a guide groove 503. The ring groove 501 on the first insert pin 106 is communicated with an exhaust hole 502, the guide groove 503 is arranged along the axial direction of the first insert 105, the axial direction of the exhaust hole 502 is vertical to the axial direction of the first insert 105, one end of the guide groove 503 is communicated with the exhaust hole 502, the other end of the guide groove 503 is communicated with the outside, the exhaust hole 502 and the guide groove 503 on the first insert 105 are communicated through the exhaust groove, and air in a mold is exhausted so as to form a glue body in the mold cavity. It should be noted that the exhaust route is not limited to the above-described manner, and may be any other exhaust route as long as the air in the cavity can be exhausted out of the mold box 301.

This application still provides a mould, as shown in fig. 1, it includes mould case 301 and a plurality of as above the hank tooth mechanism of loosing core, a plurality of hank teeth mechanism of loosing core is installed on mould case 301, realize a plurality of products of moulding plastics simultaneously, every mould in mould production second mould 35 seconds 16 caves fastest, 8 caves promote more than 1 times before efficiency is relative, the pole is criticized the cutting edge of a knife or a sword and also can be improved simultaneously, the mould durable degree also can corresponding improvement, and the efficiency of improving production is improved, the uniformity of product has been guaranteed.

The tooth-twisting core-withdrawing mechanism comprises a rack 101, a gear 102, a central shaft 103, a guide sleeve, a first insert 105 and a first insert pin 106; the central shaft 103 is a hollow structure, the gear 102 is coaxially arranged on the central shaft 103 and meshed with the rack 101, and one end of the gear 102 shaft is provided with a thread 104; the central shaft 103 is coaxially connected with the guide sleeve; the first insert 105 is arranged in the central shaft 103, and the first insert 105 is provided with an exhaust channel; the first insert pin 106 is disposed in the first insert 105, and the first insert pin 106 is provided with an exhaust groove in the axial direction, the exhaust groove communicating with the exhaust passage. The die comprises a die box 301 and a plurality of the tooth twisting and core withdrawing mechanisms; a plurality of tooth-twisting core-ejecting mechanisms are mounted on the die box 301. The rack 101 is directly meshed with the gear 102, so that the transmission wear of the gear 102 is reduced; the central shaft 103 is coaxially connected with the guide sleeve, so that the central shaft 103 can be conveniently guided and withdrawn, and the abrasion of the central shaft 103 is reduced; the exhaust channel is communicated with the exhaust groove, so that air in the mold is exhausted, and the rubber body in the cavity is molded.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Moreover, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims (10)

1. A tooth-twisting core-withdrawing mechanism is characterized by comprising: the device comprises a rack, a gear, a central shaft, a guide sleeve, a first insert and a first insert pin;

the central shaft is of a hollow structure, the gear is coaxially arranged on the central shaft and meshed with the rack, and one end of the central shaft is provided with a thread;

the central shaft is coaxially connected with the guide sleeve;

the first insert is arranged in the central shaft, and an exhaust channel is arranged on the first insert;

the first insert pin is arranged in the first insert, an exhaust groove is formed in the first insert pin in the axial direction, and the exhaust groove is communicated with the exhaust channel.

2. The threading tooth core-withdrawing mechanism according to claim 1, wherein a connection surface between said central shaft and said guide sleeve is a tapered surface.

3. The threading die core-stripping mechanism according to claim 1, wherein said guide sleeve comprises a first guide sleeve and a second guide sleeve;

the first guide sleeve and the second guide sleeve are coaxially arranged, and the lower end face of the first guide sleeve is connected with the upper end face of the second guide sleeve.

4. The tooth-twisting core-withdrawing mechanism according to claim 3, further comprising a second insert, a top bar and a second insert pin;

the second insert is mounted in the second guide sleeve;

the ejector rod is arranged in the second insert;

the second insert pin is installed in the ejector rod.

5. A threading core-retracting mechanism according to claim 1, wherein a plurality of bearings are provided in the axial direction of said central shaft.

6. The tooth reaming and core removing mechanism according to claim 1, wherein one end of the rack far away from the central shaft is connected with a driving piece.

7. The threading and core-withdrawing mechanism of claim 6, wherein the driving member is an oil cylinder, an air cylinder or a motor.

8. The threading core-stripping mechanism according to claim 1, wherein said venting groove is an annular groove.

9. The threading core-withdrawing mechanism according to claim 8, wherein said air-discharging passage comprises an air-discharging hole and a guide groove;

the ring groove is communicated with the exhaust hole;

the guide groove is arranged along the axial direction of the first insert, and the axial direction of the exhaust hole is vertical to the axial direction of the first insert;

one end of the guide groove is communicated with the exhaust hole, and the other end of the guide groove is communicated with the outside.

10. A mould comprising a mould box and a plurality of the tooth-reaming mechanism according to any one of claims 1 to 9;

and the plurality of tooth twisting and core withdrawing mechanisms are arranged on the mould box.