阅读说明：本技术 一种用于生产壁厚均匀的厚壁管材的模具 (Mould for producing thick-wall pipe with uniform wall thickness ) 是由 邓添华 郭伟 谭建志 于 2020-06-28 设计创作，主要内容包括：本发明涉及管材生产设备领域,更具体地,涉及一种用于生产壁厚均匀的厚壁管材的模具,包括模座、与模座连接的螺旋体和外模体、与螺旋体连接的收缩芯、与收缩芯连接的模芯和设置于模芯外部的口模,螺旋体和收缩芯与外模体之间形成流道,口模和模芯之间形成挤出通道,流道连通至挤出通道,模座上装有驱动模芯转动的驱动机构。通过模芯旋转使得挤出通道内的熔体内壁部分产生环向运动力,通过这样的反向作用力达到破坏熔体下垂而造成熔体堆积的形成条件,进而避免在生产厚壁管材中因为熔体下垂造成的管材上端薄下端厚的问题,提升厚壁管材的良品率和提高产品质量。(The invention relates to the field of pipe production equipment, in particular to a die for producing thick-wall pipes with uniform wall thickness. Make the fuse-element inner wall part in extruding the passageway through the mold core rotation and produce the hoop motion power, reach through such reverse acting force and destroy the fuse-element and hang down and cause the accumulational formation condition of fuse-element, and then avoid in the thick-walled tubular product of production because the thick problem of the thin lower extreme in tubular product upper end that the fuse-element droops to cause, promote the yields of thick-walled tubular product and improve product quality.)

1. The die for producing the thick-wall pipes with uniform wall thickness comprises a die holder (1), a spiral body (2) and an outer die body (3) which are connected with the die holder (1), a contraction core (4) which is connected with the spiral body (2), a die core (5) which is connected with the contraction core (4), a mouth die (6) which is arranged outside the die core (5) and a mouth die holder (7) which is used for fixing the mouth die (6), wherein a flow channel (8) is formed between the spiral body (2) and the contraction core (4) and between the outer die body (3) and the mouth die holder (7), an extrusion channel (9) is formed between the mouth die (6) and the die core (5), and the flow channel (8) is communicated to the extrusion channel (9), and is characterized in that a driving mechanism which drives the die core (5) to rotate is arranged on the die holder (1).

2. Mould according to claim 1, characterized in that said driving means comprise a driving shaft (10) connected to said mould core (5) and a power source assembly driving said driving shaft (10) in rotation, said power source assembly being mounted on said mould base (1).

3. Mould for producing thick-walled tubes of uniform wall thickness according to claim 2, characterized in that the power source assembly comprises a mounting plate (11) mounted on the mould base (1) and an electric motor (12) mounted on the mounting plate (11).

4. A mould for producing thick-walled tubing of uniform wall thickness according to claim 3, characterized in that the mould core (5) and the shrink core (4) are connected by bearings, and the drive shaft (10) and the mounting plate (11) are connected by bearings.

5. A mould for producing thick-walled tubes of uniform wall thickness according to claim 1, characterized in that the core (5) is provided with an extension (13) protruding from the end face of the die (6).

6. A mould for producing thick-walled tubes of uniform wall thickness according to claim 5, characterized in that the end of the extension (13) is at a distance of three to six percent of the internal diameter of the die (6) from the end face of the die (6).

7. The die for producing thick-walled pipes with a uniform wall thickness as claimed in any one of claims 1 to 6, further comprising an auxiliary material feeding portion (14) connected to the extrusion channel (9) and a supplementary material feeding machine (15) connected to the auxiliary material feeding portion (14).

8. A mould for producing thick-walled tubes of uniform wall thickness according to claim 7, characterized in that the opposite sides of the die (6) are provided with a first pressure sensor (16) and a second pressure sensor (17), respectively, for measuring the pressure in the extrusion channel (9).

9. Mould for producing thick-walled tubular products with a uniform wall thickness according to claim 8, characterized in that the first pressure sensor (16) and the second pressure sensor (17) are located on the side of the auxiliary material delivery portion (14) close to the spiral body (2).

10. Mould for producing thick-walled tubing of uniform wall thickness according to claim 7, characterized in that the shrink core (4) is provided with protrusions (401), the cross section of the protrusions (401) being trapezoidal.

Technical Field

The invention relates to the field of pipe production equipment, in particular to a mold for producing a thick-wall pipe with uniform wall thickness.

Background

The conventional pipe production mold generally comprises a spiral body connected with a mold base, an outer mold body arranged outside the spiral body, a mold core and a neck mold arranged outside the mold core. The melt enters the spiral body, flows along the spiral groove of the spiral body, enters a channel between the neck mold and the mold core, and finally flows out of the channel for molding. Patent document for instance "CN 201721019735.4" discloses a novel cavity wall winding pipe forming die in PE, including linkage segment, the base of being connected with the linkage segment, the spirochaeta of being connected with the base, the spirochaeta outside is equipped with outer die body, still includes the shrink core, and shrink core and outer die body form the passageway, and the shrink core is connected with the mold core, and the mold core outside is equipped with the bush.

When adopting above-mentioned mould production big specification thick-walled pipe, the fuse-element is more and pile up certain thickness, consequently when the fuse-element is followed mould extrusion moulding, the fuse-element all has the problem that takes place the fuse-element and hang down because of the dead weight, leads to the fuse-element can pile up the lower extreme of mould, arouses the problem that the thin lower extreme of tubular product upper end is thick, adjusts very difficultly, produces a large amount of waste products.

Disclosure of Invention

The invention aims to solve the problem that the upper end of a thick-wall pipe is thin and the lower end of the thick-wall pipe is thick during extrusion molding in the prior art, and provides a mold for producing the thick-wall pipe with uniform wall thickness.

In order to solve the technical problems, the invention adopts the technical scheme that: a mold for producing thick-wall pipes with uniform wall thickness comprises a mold base, a spiral body and an outer mold body which are connected with the mold base, a shrinkage core connected with the spiral body, a mold core connected with the shrinkage core and a finish mold arranged outside the mold core, wherein a flow channel is formed between the spiral body, the shrinkage core and the outer mold body, an extrusion channel is formed between the finish mold and the mold core, the flow channel is communicated to the extrusion channel, and a driving mechanism for driving the mold core to rotate is arranged on the mold base.

The melt enters the outer die body and the spiral body from the feeding port for primary shunting, the spiral body divides the melt into a plurality of strands from one material flow, the strands move axially along the flow channel, and finally the melt passes through an extrusion channel formed by the neck ring and the die core and is formed in the extrusion channel. The mold core is driven by the driving mechanism to rotate, when the melt runs to the extrusion channel, the mold core continuously rotates in the inner hole of the base tube of the melt to generate continuous circumferential annular force, the continuous circumferential annular force can cause the inner wall part of the melt to generate annular motion force, and the forming condition that the melt is prevented from sagging and the melt is accumulated is achieved through the balance of the reverse acting force and the self gravity of the melt.

Preferably, the driving mechanism comprises a transmission shaft connected with the mold core and a power source component for driving the transmission shaft to rotate, and the power source component is installed on the mold base. The power source assembly comprises an installation plate installed on the die holder and a motor installed on the installation plate. The transmission shaft is driven to rotate by the motor, so that the mold core rotates. The motor is installed on the mounting panel, and not direct mount on the die holder, slows down the vibration that the die holder received, also reduces the repacking on the die holder, keeps the stability of die holder.

Preferably, the mold core is connected with the shrinkage core through a bearing, and the transmission shaft is connected with the mounting plate through a bearing. The bearing can make the rotation between mold core and the shrink core more smooth and easy, can ensure the position stability of transmission shaft moreover. The bearing is installed and can reduce the processing repacking to the mould on the mounting panel, and mounting panel convenient to detach changes, and the die holder is not convenient for often dismantle the change.

Preferably, the mold core is provided with an extension part protruding out of the end face of the die. The melt droops are generally generated only when the melt departs from an extrusion channel between the neck mold and the mold core and is suddenly converged, so that the mold core breaks through the design that the end surfaces of the neck mold and the mold core in the traditional design are smooth, the mold core is provided with an extension part protruding out of the end surface of the neck mold, the circumferential annular force of a melt inner hole generated by the rotation of the mold core can be supported after the melt departs from the extrusion channel through the extension part, and the condition that the melt departs from the extrusion channel and then linearly descends is improved.

Preferably, the distance between the end of the extension part and the end face of the neck ring die is three to six percent of the inner diameter of the neck ring die. The phenomenon that the film stripping of the pipe is influenced by overlong extension parts is avoided, and the phenomenon that the extension parts are too short and cannot generate a supporting effect is also avoided.

Preferably, the auxiliary material feeding device further comprises an auxiliary material feeding part communicated to the extrusion channel and an auxiliary material feeding machine connected with the auxiliary material feeding part. When the melt is extruded out of the channel, the melt flows to the lower end of the extrusion channel due to the self-weight tension of the melt, so that the problem that the upper end of the pipe is thinner in wall thickness and the lower end of the pipe is thicker is also caused. When the auxiliary material feeding device is used, the auxiliary material feeding part and the feeding auxiliary machine are located at the upper end, the melt is extruded from the auxiliary material feeding part through the feeding auxiliary machine and enters the extrusion channel, feeding of the position with the thinner wall thickness is completed, and wall thickness deviation caused by melt sagging is compensated. After breaking down the conditions of melt sag, the extrusion channel was fed in order to further ensure that no problems of uneven wall thickness occurred in the extrusion channel.

Preferably, two opposite sides of the die are respectively provided with a first pressure sensor and a second pressure sensor for measuring the pressure of the extrusion channel. When using the mould, first pressure sensor is located the upper end, and second pressure sensor is located the lower extreme, and the fuse-element droops to cause and extrudes the discharge pressure of passageway and unbalance, and when first pressure sensor was less than the pressure that second pressure sensor detected through the pressure that extrudes the passageway that detects the upper end, the explanation has taken place the problem that the fuse-element droops, and supplementary feed auxiliary engine starts to carry out the supplementary material. When the two pressure sensors detect that the pressures are consistent, the supplementary feeding auxiliary machine is automatically controlled to stop supplementary feeding.

Preferably, the first pressure sensor and the second pressure sensor are located on one side of the auxiliary material feeding part close to the spiral body. When the melt is extruded out of the channel, the melt passes through the first pressure sensor and the second pressure sensor, and after pressure imbalance is detected, the supplementary material auxiliary machine can supplement the melt to the extrusion channel in time. And if the first pressure sensor and the second pressure sensor are positioned at the rear end of the auxiliary material feeding part, the pressure imbalance is detected, and the position with the pressure imbalance cannot be supplemented with materials in time.

Preferably, the shrinkage core is provided with a convex part, and the cross section of the convex part is trapezoidal. The bellying of shrink core makes the runner through the process of grow again by big back that diminishes, makes the runner produce different pressure to the fuse-element, through this kind of pressure variation, realizes the closely knit effect of fuse-element compression. Finally, the melt is thinned from thick to thin and the excircle is reduced from big to small through an extrusion channel consisting of a neck mold and a mold core, the stretching size is determined, and the wall thickness is controlled.

Compared with the prior art, the invention has the beneficial effects that: make the fuse-element inner wall part in extruding the passageway through the mold core rotation and produce the hoop motion power, reach through such reverse acting force and destroy the fuse-element and lead to the fact the accumulational formation condition of fuse-element because of the dead weight is flagging, and then avoid in the thick-walled tubular product of production because the thick problem of the thin lower extreme in tubular product upper end that the fuse-element flagging caused, promote the yields of thick-walled tubular product and improve product quality.

Drawings

FIG. 1 is a schematic structural view of a mold for producing thick-walled pipes having a uniform wall thickness according to the present invention;

fig. 2 is a partially enlarged view of a position a of fig. 1.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings: