CN218019730U - Rotational vibration device for PTFE (Polytetrafluoroethylene) mold - Google Patents

Abstract

The utility model relates to a rotational vibration device of a PTFE mold, which comprises a mold main body, a rotating unit, a vibration exciter and a frame; the rotating unit comprises a rotating motor and a turntable, and the turntable is arranged on the rack; the die main body comprises a rigid outer die, a built-in core rod, a lower pressure head and an upper pressure head; the rigid outer die and the lower pressure head are both fixedly arranged on the turntable and are coaxial with the turntable, and the lower pressure head is positioned at the bottom of the rigid outer die; the built-in core rod is coaxially arranged inside the lower pressure head, and the bottom of the built-in core rod is connected with the rotary table through a damping cushion block; the upper pressure head is sleeved between the rigid outer mold and the built-in core rod in a sliding manner; a die cavity is formed among the rigid outer die, the built-in core rod, the upper pressure head and the lower pressure head; the vibration exciter is arranged on the built-in core rod and is positioned below the top surface of the lower pressure head. The utility model discloses a device can make the PTFE material obtain evenly filling and preliminary tap in the mould main part, and the die cavity can hold more materials, and production efficiency is high and it is even to pack.

Description

Rotational vibration device for PTFE (Polytetrafluoroethylene) mold

Technical Field

The utility model relates to a PTFE compression molding processing field, concretely relates to PTFE mould rotational vibration device.

Background

Compression molding is the most common molding process of polytetrafluoroethylene, namely polytetrafluoroethylene powder is compressed into a required shape by pressure, and the polytetrafluoroethylene can be compression molded into products such as plates, rods, sleeves, adhesive tapes, sealing rings, diaphragms and the like, and is applied to various fields such as chemical industry, machinery, buildings and the like. With the continuous improvement of the molding equipment, the molding process is continuously improved, and the PTFE molding method comprises four steps of filling, preforming, sintering and cooling. The pre-forming is to uniformly add PTFE powder into a die and press the PTFE powder into a compact pre-forming product (namely a blank) at normal temperature, wherein the uniformity of the filler plays a crucial role in the quality of a final product.

For the large-scale blank, because the mould is higher, often more than 3m, and the moulding-die utensil is generally made by carbon steel, the quality is more than 1 ton, should not remove, be located the eminence during the operation of throwing the material, consider safety factor, operating personnel can't follow the even downwards material of throwing in each position of mould, even operating personnel throws the material with the material distributing type, but still be difficult to guarantee the evenly distributed of material in the mould, and along with the continuous increase of material, the uneven degree of material distribution is bigger and bigger, when preforming suppression begins, the inequality of material will lead to the atress of material each position different, make the density of final blank distribute unevenly, even make equipment impaired. In addition, because the volume density of the PTFE powder is small, materials with the volume of 3-4 times of that of the final product need to be added in the filling process, and when a mould with insufficient height is used, secondary feeding is needed, so that the production efficiency is reduced.

In order to improve the uniformity of materials in the mold, chinese patent CN209647577U discloses a mold rotary vibration device, which comprises a rotary platform and a mold, wherein the mold is arranged on the rotary platform, four corners of the bottom end of the rotary platform are symmetrically distributed with buffer mechanisms, and vibration motors are arranged between the buffer mechanisms on the same side, and the purpose of the mold that the rotary platform is arranged is to enable molten metal to be transferred to each position in the spoke cavity of the hub under the action of rotary centrifugal force so as to ensure that the texture of castings is more uniform. However, the mold rotary vibration device is only suitable for processing and manufacturing small products, and for compression molding of PTFE, because the size and weight of the mold are huge, if the whole mold is driven to vibrate by a vibration motor, a plurality of high-power vibration motors are required to achieve the expected vibration effect, and the requirement on the strength of equipment is huge, which results in high cost; in addition, for compression molding of PTFE, the vibration of the whole rotary platform is difficult to be applied to the center of the mold, and the vibration effect is poor.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a reasonable in design, the operation is more convenient, reinforced more even, the higher large-scale PTFE molding die of production efficiency, technical scheme as follows:

a rotational vibration device for a PTFE (polytetrafluoroethylene) mold comprises a mold main body, a rotating unit, a vibration exciter and a rack; the rotating unit comprises a rotating motor and a turntable, the turntable is mounted on the rack, and the rotating motor is used for driving the turntable to rotate;

the die main body comprises a rigid outer die, a built-in core rod, a lower pressure head and an upper pressure head;

the rigid outer die and the lower pressure head are both fixedly arranged on the turntable and are coaxial with the turntable, and the lower pressure head is positioned at the bottom of the rigid outer die; the built-in core rod is coaxially arranged inside the lower pressure head, and the bottom of the built-in core rod is connected with the rotary table through a damping cushion block; the upper pressure head is sleeved between the rigid outer die and the built-in core rod in an axially slidable manner and is positioned above the lower pressure head; a die cavity is formed among the rigid outer die, the built-in core rod, the upper pressure head and the lower pressure head;

the vibration exciter is arranged on the built-in core rod and is positioned below the top surface of the lower pressure head.

Preferably, a cushion block is arranged between the rigid outer die and the rotary table, and the height of the cushion block is smaller than that of the lower pressure head.

Preferably, an annular rubber gasket is arranged between the lower pressure head and the built-in core rod, so that the damping effect is achieved; the rubber gasket is nitrile rubber.

Preferably, an inner probe is arranged on the side part of the lower pressure head; the vibration exciter is arranged in the inner probe.

The utility model has the advantages of as follows:

1) The utility model drives the mould main body to rotate through the rotating unit, and can ensure the same filling amount at each position in the mould main body and realize the uniformity of filling by controlling the rotating angle and the feeding frequency; and operating personnel can pack at fixed position, avoids setting up a plurality of charging points to improve packing efficiency, reduce staff's intensity of labour.

2) The utility model discloses optimize the homogeneity of packing simultaneously from two aspects of rotation and vibration, mutually support through the mould rotation and plug vibration, make the material obtain better distribution at horizontal plane and vertical face. The method specifically comprises the following steps: the mold rotation is focused on optimizing the wide range of uniformity of the material in all directions in the horizontal plane. The vibration of the core rod is focused on the fine optimization of the material in a small space, and compared with the vibration of the whole platform in the prior art, the vibration exciter is connected with the built-in core rod, the flow and compaction of the material are realized through the vibration of the built-in core rod in the center of the material, and the distribution uniformity and the filling amount of the material can be improved; and a plurality of vibration exciters are not needed, so that the cost is reduced.

3) The utility model discloses a built-in plug does multi-direction motion in the space when the vibration, can make the caking material break up with rigidity external mold synergism, reduces the appearance of the little fracture of goods.

Description of the drawings:

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic view of the assembly of the lower ram and the internal mandrel of the present invention;

FIG. 3 is a bottom view of the lower ram and the internal mandrel assembly of the present invention;

FIG. 4 is a schematic view of the assembly of the lower ram and the internal mandrel of the present invention;

fig. 5 is a schematic structural view of the upper pressing head of the present invention.

The device comprises a die body 1, a rotating unit 2, a vibration exciter 3, a rack 4, a rotating motor 5, a turntable 6, a rigid outer die 7, a built-in core rod 8, a lower pressing head 9, an upper pressing head 10, a damping cushion block 11, a die cavity 12, a cushion block 13 and an inner probe 14.

The specific implementation mode is as follows:

the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the present invention, unless otherwise explicitly stated or limited, the terms "connected" and "fixed" are to be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1-5, the present invention provides a technical solution: a rotational vibration device for a PTFE (polytetrafluoroethylene) mold comprises a mold main body 1, a rotating unit 2, a vibration exciter 3 and a machine frame 4.

The rotating unit 2 comprises a rotating motor 5 and a rotating disk 6, wherein the rotating disk 6 is installed on the rack 4, and the rotating motor 5 is used for driving the rotating disk 6 to rotate. Specifically, the rotating motor 5 is installed on the frame 4, and an output shaft of the rotating motor 5 is connected with the turntable 6 through a belt transmission mechanism.

The die body 1 comprises a rigid outer die 7, a built-in core rod 8, a lower pressure head 9 and an upper pressure head 10; the bottom of the rigid outer die 7 is arranged on the turntable 6 through a cushion block 13, and the height of the cushion block 13 is smaller than that of the lower pressure head 9; the built-in core rod 8 is coaxially arranged inside the lower pressure head 9, and the built-in core rod 8 is arranged on the turntable 6 through a damping cushion block 11; the lower pressure head 9 and the upper pressure head 10 are sleeved between the rigid outer mold 7 and the built-in core rod 8, and the bottom of the lower pressure head 9 is fixedly arranged on the turntable 6; an annular damping rubber is arranged between the lower pressure head 9 and the built-in core rod 8; the upper pressure head 10 can slide along the rigid outer die 7 in the axial direction; the rigid outer die 7, the built-in core rod 8, the upper pressure head 10 and the lower pressure head 9 form a containing space which is a die cavity 12 and is used for storing materials.

The vibration exciter 3 is arranged on the built-in core rod 8, and the side part of the lower pressure head 9 is provided with an inner probe 14 for preventing the vibration exciter 3 from interfering with the lower pressure head 9 when in work; the vibration exciter 3 is arranged in the inner probe 14, the vibration exciter 3 is started, vibration is conducted to the built-in core rod 8, and then the vibration effect is achieved on the materials.

The damping cushion block 11 and the annular rubber gasket are made of nitrile rubber.

The utility model discloses a mould rotational vibration device's application method:

s1, starting a rotating unit and a vibrating unit of a PTFE (Polytetrafluoroethylene) mold rotating and vibrating device, and setting a required rotating frequency according to the time for feeding each batch of the PTFE mold. For example, the time for each batch was 30s, the rotation frequency was set at times/30 s, and the single rotation angle was 90 °.

And S2, starting the vibration unit and the rotary chassis, scattering PTFE powder to be molded, and adding the scattered PTFE powder to be molded into a die cavity of the die main body in batches to uniformly fill when the rotation of the rotary chassis is finished each time.

And S3, after the filling is finished, sleeving an upper pressure head on the built-in core rod from the upper end of the rigid outer die, and performing preforming after the upper pressure head compresses PTFE powder.

Claims (5)

1. The PTFE mold rotary vibration device is characterized by comprising a mold main body (1), a rotary unit (2), a vibration exciter (3) and a rack (4);

the rotating unit (2) comprises a rotating motor (5) and a rotating disc (6), the rotating disc (6) is installed on the rack (4), and the rotating motor (5) is used for driving the rotating disc (6) to rotate;

the die body (1) comprises a rigid outer die (7), a built-in core rod (8), a lower pressure head (9) and an upper pressure head (10); the rigid outer die (7) and the lower pressure head (9) are both fixedly mounted on the turntable (6) and are coaxial with the turntable (6), and the lower pressure head (9) is positioned at the bottom of the rigid outer die (7); the built-in core rod (8) is coaxially arranged inside the lower pressure head (9), and the bottom of the built-in core rod (8) is connected with the rotary table (6) through a damping cushion block (11); the upper pressure head (10) can be axially sleeved between the rigid outer die (7) and the built-in core rod (8) in a sliding manner, and the upper pressure head (10) is positioned above the lower pressure head (9); a die cavity (12) is formed among the rigid outer die (7), the built-in core rod (8), the upper pressure head (10) and the lower pressure head (9);

the vibration exciter (3) is arranged on the built-in core rod (8) and is positioned below the top surface of the lower pressure head (9).

2. The rotational vibration device for the PTFE mold according to claim 1, wherein a cushion block (13) is arranged between the rigid outer mold (7) and the rotating disk (6), and the height of the cushion block (13) is smaller than that of the lower pressure head (9).

3. The PTFE die rotary vibration device according to claim 1, characterized in that an annular rubber gasket is provided between the lower ram (9) and the inner mandrel (8).

4. The rotational vibration device for a PTFE mold according to claim 1, wherein the cushion block (11) is made of nitrile rubber.

5. The PTFE die rotary vibration device according to claim 1, characterized in that the lower ram (9) is provided with an inner probe (14) at its side; the vibration exciter (3) is arranged in the inner probe (14).

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