SU1068347A1 - Device for protecting threads,apparatus for taking polymeric threaded articles off thread-shaping member,and mould for making same - Google Patents

Abstract

1. A device for thread protection, including a protective casing, a threaded cap and means for fixing the casing and the cap relative to each other, characterized in that, in order to simplify the design and speed up the installation process and its protection and removal from it, the cap is designed as elastically interconnected in one of the bases by a disk or a ring of lobed threaded elements, which in the closed state form a threaded surface. 2. A device for removing polymer threaded products from a thread-forming element containing a means of removal and its drive is confused with the fact that, in order to provide removal of the product while making longitudinal cuts in it, the removal tool is made in the form of a spring-loaded spherical a conical cup with spring-loaded knives installed in the grooves (L and a support ring placed on the conic cup mounted on the ends of the knives. 3. A mold for the manufacture of polymeric threaded products containing a fixed gating plate, a die, a punch, a removal plate and a base, characterized in that the form is provided with knives and means transverse relative to the direction of opening the form to move with 4 not in the form of tongs with guide grooves, and in the matrix or the punch has longitudinal grooves in which the knives are placed.

Description

The invention relates to mechanical engineering, is intended to protect threads from clogging, exposure to corrosive media and mechanical damage, and can be used in the oil and chemical industries, construction, and other sectors of the national economy. A device for thread protection is included, which includes a protective casing, a threaded cap and means for fixing the casing and the cap relative to each other. The threads (.y cap is made of elastic plastic, for example, high-density polyethylene, and has a conical shape. At the top end of the cap there is an inner flange passing into the neck bent inward, the outer diameter of which is slightly larger than the inner diameter of the pipe to be protected. The conical housing is made of steel or an aluminum sheet and has an inner flange with a neck bent inward at the top end of the casing. The casing is fastened with a cap extruded on the casing by a stopper 1. The disadvantage of the thread protection device is difficult Its design, unreliability in operation, as it does not provide proper sealing and thread protection from contamination and damage, and installing the device on the protected thread and removing it from it takes a lot of time, Since both of them are made by rotating the device, it is also known to remove polymer threaded articles from a forming element, which includes a means of removal and its drive 2. The disadvantage of the known troystva for removably threaded polymeric products with rezbooforml guide member is that it allows not simultaneously with the removal of the article with the guide member rezbooforml perform longitudinal cuts in it, which entails an additional mechanical treatment of products. A known mold for the manufacture of polymer threads, containing thread forming inserts, shifted by pushers interacting with an ejection plate. A wedge element is placed between the thread-forming inserts, resulting in the thread being made with gaps 3. Most closely to the invention is a mold for the manufacture of polymeric products containing a fixed runner plate rigidly connected to the die, a punch, a plate for removal and a base 4 A disadvantage of the known molded molds for the manufacture of polymer threaded products is that they exclude the possibility of removing the products with simultaneous longitudinal cuts in them, for which an additional On the mechanical processing and tooling. The aim of the invention is to simplify the construction and speed up the installation process of the device for protecting the thread on the protected thread and removing it. This goal is achieved by the fact that in the device for thread protection, which includes a protective casing, a threaded cap and means for fixing the casing and a cap relative to each other, the cap is made in the form of a disk or ring of lobed threaded elements elastically interconnected in one of the bases. tightly threaded surface. At the same time, in order to ensure the removal of the product with simultaneous longitudinal cuts in it, in the device for removing polymer threaded products from the thread-forming element containing the removal tool and its drive, the removal tool is designed as a spring-loaded conical cup in the housing with installed in the grooves of spring-loaded knives and placed on the conical glass of the support ring mounted on the ends of the knives. In addition, the casting mold for the manufacture of threaded polymer products containing a fixed casting plate rigidly connected to the die, a punch, a removal plate and a base is provided with knives and means transverse relative to the direction of opening the movement forms, made in the form of tongs with guide grooves, and in the matrix or the punch there are made longitudinal grooves in which the knives are placed. FIG. 1 shows a device for protecting an internal thread; in fig. 2 - the same for external thread; in fig. 3 - threaded cap with a ring; in fig. 4 - device for removal, longitudinal section; in fig. 5 shows section A-A in FIG. four; in fig. 6 - injection mold for the manufacture of caps with internal thread; in fig. 7 is a section BB in FIG. 6; in fig. 8 is a variant of the mold (for the manufacture of caps with an external thread); in fig. 9 is a section bb of FIG. 8. The device for thread protection consists of a conical casing 1 and a threaded cap 2 installed on the protected thread 3, which can be either internal or another. The cap has an annular bead 4, fixing the cap relative to the casing and thus ensuring the fixation of the device as a whole on the protected thread. The bead may have an annular shaped groove (Fig. 2), which

copies the annular shoulder 5, which is made on the casing and is fixed in this groove.

The cap 2 (Fig. 3) is 1) in the form of an elastically interconnected in one of the bases by a ring or a disk 6 of lobed threaded elements 7, which in a closed state form a threaded surface, a copying surface of the protected thread, which can be either conical or cylindrical. Petals 7, shoulder 4 and ring 6 (or disk) are made as one piece of elastic (elastic) material, such as a thermoplastic polymer. The number of petals can be any, and the most appropriate number of them - 3-6.

When protecting a cylindrical thread, the outer surface of the petals 7 forms in a closed state a conical surface, the smaller base of which is on the side of the ring 6 (or the disk).

Petals 7 are sectors of a hollow truncated cone, one of the surfaces of which may be cylindrical. The lateral surfaces of the petals of the clutch bag mate with each other are angled relative to the radial direction, and the bevels are made in such a way that one part of the petals placed through one is internal width exceeds the outer, and the other - on the contrary, - the outer width exceeds the inner. When closing the petals and creating a crimping force, this ensures their lateral movement relative to each other and, as a result, a reduction in the transverse dimensions of the cap, which is necessary when installing it on the thread.

The device is installed on the protected thread as follows.

At first, the petal cap 2 is put on the thread 3 longitudinally until it stops. When the cap is put on the internal thread (Fig. 1), it is squeezed by threaded protrusions equal to the height of the thread. When the petals are compressed due to the bevel of their mating surfaces, a radial force arises, which bends back, those petals whose inner width exceeds the outer one, inside the cap. This provides a reduction in the lateral dimensions of the cap and its quick installation without turning. Then the casing 1 is inserted into the disk 6 into the cap up to the stop, which, with its large base, first bends the ourtic 4 and, with further movement, is fixed by it. As it moves, the casing retracts the protruding petals with its outer conical surface and ensures their wedging, which increases the tightness of the joints.

The device is mounted on the external thread in a similar way;

putting the cap on the petals is consumed by the TC, and the thread on them does not interfere with putting it on. When protecting a cylindrical thread, the taper of the outer surface of the petals 7 ensures their compression by the cover 1, which increases the tightness of the protection.

The device is removed from the thread by pressing a special tapered ring on the collar .4, which increases in diameter, after which the cover and cap are removed.

To facilitate the separation of the casing and the cap, they can be spring-loaded relative to each other, for example using an elastic gasket installed, for example, between the bottom of the casing 1 and the disc 6 of the cap. To simplify installation and removal of the device, the cover and cap can be coupled to each other by an elastic bond, such as a spring.

To increase the operational reliability of the device, the cover 1 is made;

It is made of a material, for example a metal, the thermal expansion coefficient of which is 3-10 times less than that of the material of the cap 2, made, for example, of a thermoplastic polymer. Then when operating the device

at higher than assembly temperatures, temperature wedging of the cap in the gap between the casing and the thread to be protected and increased tightness of the protection is provided. If the device will be operated at lower temperatures, then both the protective cover and the cap are made of materials, for example polymers, whose thermal expansion coefficients exceed the same coefficients of the material of the thread being protected also by 3-10 times.

A device for removing polymer threads from a thread forming element consists of a means of removal and its drive 8 for reciprocating movement. The tool eaten4a is made in the form of a spring-loaded conical glass 10 which is concentrically placed in the housing 9 with knives 12 installed in the grooves 11 and

placed on the conical cup of the support ring 13 mounted on the ends of the knives 12. Springs 14 are located between the lower ends of the knives and the bottom of the conical cup. To fix the threaded product on the support ring, 13 is provided

annular groove 15.

The device works as follows.

The thread forming element 16 with the workpiece is mounted on the support ring 13 and together with the drive 8

the reciprocating movement is lowered, with the knives 12 being inserted into the workpiece prior to contact with the thread forming element 16. Thus, longitudinal notches are made in the workpiece.

When the thread-forming element 16 reaches the bottom of the conical sleeve 10, the latter also begins to descend, overcoming the resistance of the springs, until the support ring 13 is lowered onto the casing 9. Thereafter, the workpiece due to elastic deformation is tightened by the support-forming ring 13 of the thread-forming element 16 and finally cut with knives 12, as a result of which the removal is carried out (Products with simultaneous longitudinal cuts in it).

The casting mold consists of a fixed gating plate 17, rigidly connected to the die 18, a punch 19, a removal plate 20 with pushers 21, an ejection plate 22 with a shank 23 and a base 24. The punch 19 is a mold forming element for manufacturing caps with an internal carving. In the matrix 18, longitudinal grooves 25 are made in which the knives 26 are placed. A means transverse with respect to the direction of opening the movement pattern is made in the form of tongs 27 with guide grooves in which the fingers 28 are fixed in the intermediate plate 29.

In the ejection plate 22, grooves 30 are provided for moving the gates 27.

In the embodiment of an injection mold for manufacturing caps with external thread, the knives 26 are placed in longitudinal grooves in the punch 19, the thread-forming elements being the matrix 18. An actuator 31 is provided to move the tongs 27 fixed in the intermediate plate 29 and connected with them 32. An annular groove 33 is provided to hold the workpiece on the punch.

The form works as follows.

After injection of the polymer melt and technological exposure, the mold is opened and the punch 19 is removed from the matrix 18. When the shank 23 contacts the thermoplastic-automatic support, the ejection plate 22 stops and the knives 26 further radially move the base 24 to the intermediate plate 29. wherein the knives 26 are inserted into the workpiece prior to contact with the thread forming punch 19. Parallel movement of the knives 26 is provided with guide grooves 34.

Further, due to the interaction of the ejection plate 22 with the pushers 21, the workpiece is removed from the punch 19 with a 20 removal plate

During the removal of the workpiece knives 26

0 final cut is performed

blanks and removal of the product from the mold.

In the embodiment of the mold for the manufacture of caps with an external thread, the introduction of knives into the workpiece is carried out by the drive 31 through drafts 32, which move the knives 26. Then, the mold is opened and the workpiece is removed with its simultaneous final cutting similar to that specified.

During the mold closure, the preform 0 is removed from the mold 18 on the core 19 by keeping it on the last annular groove 33.

The use of the invention will provide economy of materials in the national economy both by reducing the proposed material consumption devices and by reducing the damage to the protected thread of products, such as drill pipes.

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FIG.

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FIG. 7

FIG. eight

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Claims (3)

1. A device for protecting the thread, including a protective casing, a threaded cap and means for fixing the casing and / 54) WOULD. the cap relative to each other, characterized in that, in order to simplify the design and speed up the process of installing it on the protected thread and removal from it, the cap is made in the form of flap threaded elements elastically connected to one another by a disk or ring, forming in a closed state threaded surface. 2. A device for removing polymer threaded products from a thread-forming element, containing a means of removal and its drive ^ characterized in that, in order to ensure removal of the · product with simultaneous longitudinal cuts in it, the removal means is made in the form of a spring-loaded conical cup concentrically placed in the body with statutes- <g spring-loaded knives in grooves and a support ring mounted on a conical cup mounted on the ends of the knives. 3. Injection mold for the manufacture of polymer threaded products, containing a fixed sprue plate, die, punch, removal plate and base, characterized in that the mold is equipped with knives and means transverse to the opening direction of the displacement form, made in the form of gates with guide grooves, and in the matrix or punch, longitudinal grooves are made in which the knives are placed.