SU1215609A3 - Moulding device for manufacturing front coupling from plastic pipe - Google Patents

Abstract

PURPOSE:To form a fancet excellent in the inside shape and dimensional accuracy, by slidably fitting the segments of a split cylindrical metal mold whose diameter is reduced by displacing moving members back, on the tapered surfaces of the finger parts of the moving members. CONSTITUTION:A hydraulic cylinder 11 is driven to displace a flange 9 on the rear end of the second moving member 5b back to an end plate 61 on a sleeve 6. The second metal mold segment 12b falls toward the axis of a support bar 1 due to the backward displacement of the second moving member 5b. When the fall has ended, the projection m of the second metal mold segment 12b is located inside the diameter of a fancet W shown by a dotted line. A piston rod 8 is thereafter retracted by a hydraulic cylinder so that the finger part 52b of the second moving member 5b and the finger part 52a of the first moving member 5a are simultaneously displaced back.

Description

2. The device according to claim 1, from l. This is due to the fact that one group of segments is installed with the possibility of radial and axial movement relative to the guide rod,

and another group of segments with their front ends connected to the direction of the rod.

3, The device according to PPP 1 and 2, on the basis of the fact that the support relates to the processing of plastics, namely, a device for making an end coupling of a plastic pipe, and can be used, in particular, dp joints of polyvinyl chloride pipes.

FIG. 1 shows a forming device. At the moment of withdrawal from the coupling with segments of one group removed from the last, a longitudinal section; in fig. 2 - forming heart, axonometric; FIG. 3 shows the device shown in FIG. one,

lengthwise cut; in fig. A - section A-A in FIG. 3} in FIG. 5 - section bb on fig.Z; Fig. 6 is a diagram of the arrangement of the segments during the drawing inward of the segments of one group, the diagram; Fig. 7 shows a longitudinal section of the device with segments of both groups pulled out of the coupling; Fig. 8 is an example of an embodiment of the device.

The forming device comprises a form 1, a core including a guide rod 2, on the front end I of which the base 3 is fixed. On the base 3 a head 4 is fixed, which is fastened to it with bolts 5. The rear end 6 of the head 4 protrudes beyond the front end of the base 3. On the periphery of the rod 2 is arranged with movable relative to it alternating between separate segments 7 and 8, forming an annular outer surface of the core, with segments 7 and 8 having an annular protrusion 9 for forming an annular groove in the coupling. The outer surface of each segment of both groups has a length

The elements are made in the form of fingers movably connected to the supporting surfaces of the segments, the palids of each group of segments being associated with individual drives of their movement along the guide rod, the angle of inclination of the tapered surfaces of the fingers being selected based on the condition of the self-braking of the fingers on the guide rod.

Sh

(five

20

25

thirty

35

40

12

at least two portions a, inclined in the outward direction relative to the longitudinal axis of the rod 2, and a portion b arranged between them. On the front end surface of the segments 7 and 8 there is a recess 10 that engages with the end face 6 of the head 4. The front end of each segment 7 is connected to the base 3 of the stem 2 so that it slides freely in the radial direction. Each segment 7 (Fig. 2) is made tapering towards the rear end, while each individual segment 8 is formed extending towards the rear end. Segments 7 and 8 are installed with the possibility of contacting side surfaces and have conical bearing surfaces with which they rest on supporting elements which are formed in the form of two movement groups of alternating fingers II and 12. The fingers 11 are located around the ring 13 at the same angle each other. relative to a friend. In this case, applied three fingers 11, located at an angle of 120 ° relative to each other. Each of the fingers II has a bevel toward the front end, forming a surface 14. On this surface there is a directional guide 15, having a profile in the form of a dovetail (Fig. 4 and 5). Each finger P has a recess 16 at the back end. The fingers 12 are also set at the same angle to each other around the ring 17. The number and bevel angle of the fingers 12. are chosen in the same way as the fingers of P. Each finger 12 is also.

3

It also has a bevel, forming a surface 18 with a guide 19, also having a profile in the shape of a swallow; вост East. Each finger P (as shown in Figs. 4 and 5 in cross sections has a rectangular shape, and its lower surface has a dy of guar 20, corresponding to the circumference of the rod 12, on which each finger 11 rests.

Each finger 12 is a cross section of a polygon, which runs bevels 21 on both lower sides, which are touched on the lower sides of the finger 11. In addition, fingers 12 have an arc 22 on the bottom surface. Rings 13 and 17 with fingers fixed on them are free to move along the guide rod 2. The guide lines 15 and 19 form slots made on the shape of the grooves made on the conical bearing surfaces of the segments 7 and 8, the guides 15 interacting with the slots of the segments 7, and the guides 19 - with the slots of the segments 8 Ring 17 Pull into the recess I6 of the fingers 11, A sleeve 23 is mounted on the rod 2, connected to the ring 13 of the fingers 11 by means of bolts 24 and has a face plate 25 with a through hole 26 through which the guide rod 2 passes. The plate 27 of the hydraulic cylinder is screwed into the plate 25 (not shown). A flange 28 is mounted in the sleeve, which is bolted to the ring 5 by 7 fingers 12. The hydraulic cylinder 30 is fixed to the plate 25 and the pusher 31 is connected to the flange 28.,

In the example of the device (Fig. 8), the finger 12 is attached directly to the ring 32, and the pusher 33 attached to the finger 11 passes through the ring 32, while the flange 34 is attached to the other end of the pusher 33. The flange 34 can slide along the guide rod 2 The ring 32 connected to the pusher 35 of the hydraulic cylinder is pulled out by the pusher to move the fingers to first remove the segments 8, and then the ring 32 abuts the flange 34 to move the fingers 11 (the second to remove the segments 7).

In the device, segments 7 and 8 have a certain ratio of angles 9-f

09

and Qj (Fig. 4), under which segments 7 and 8 alternate, with an angle of 9, (fig. 3) of the upper surface 14 or 18 of the fingers 11 or 12. This ratio is

determined by ensuring that the segments 8 are evenly removed and the segments 7 move in the direction of the axis of the guide rod 2, i.e. to reduce the radius of the heart

After synchronous removal of the first segments of one group and then the segments of the second group, the main relationship is established between angle 0, relative to the change in width of individual segments 7 and 8 of the core, angle 8 2, under which the individual segments 7 and 8 of the first and second groups are alternately installed, and Sj top surfaces

fingers 11 and 12. This ratio is becoming clear from FIG. 6, in which the dotted lines indicate the condition in which the individual segments 8 of the core of the second group

temporarily removed only on the LV, and the interim and A is formed between the individual segments 8 and 7 of the second and first groups of core segments by removing the individual segments 8 of the second core group ,. , u6

Direction less radius

the segments 7 of the first group are limited by the angle b and the interval L &

regarding this direction

equal to l a 51 p wg. Respectively,

40

y6

tgGi ib

ein 9,

Since segments 7 and 8 of both groups are synchronously removed, as indicated earlier, segments 7 of the first group also move only to i 8 after removing segments 8 of the second group, which causes retracting to li (Separate segments 8 of the second group and moving to a decrease in the radius per liter of segments 7 of the first group can be a high-ratio

8C

The state of equilibrium between the reduction of the radius of the individual elements of the core of the first group and retracting. separate elements of the core of the second group can be inflated as

 ,, and, cfleflOBatenbHo, you can write the equation:

t eilsinSi 9

It is desirable to comply with this ratio in the implementation of the proposed structure.

This ratio is obtained taking into account the fact that the bevel angles of the upper surfaces of the fingers of the first and second groups are the same and equal to Sj.

However, both bevel angles may be different, and in this case, an expression corresponding to the above can be obtained, based on the description of the operation of the device.

The device works as follows.

The end part of the coupling is heated and crimped from the head by 4 individual core elements or crimped by pushing it in the space formed between the core and the outer mold 1, which is installed over the core segments and the head 4, the specified space being equal to or greater than the wall thickness of the pipe to get the specified wall thickness of the coupling.

A vinyl chloride pipe having a diameter of 150 mm and a thickness of 8.9 mm was used to manufacture the coupling. The angles 0,, 92 and vz in the core are equal to 3-11; 60 and 4-12 respectively. The space between the core and the shape was 10.5 mm.

Despite the high pressure to which the core elements were subjected, the individual segments 7 of the first group were not removed, since they were connected to the base 3, to move only in the direction of decreasing radius. Since these elements "g segments 7 are connected to the beveled surfaces 14 of the fingers 11 of the first group of core elements, the individual core elements - segments 7 serve to press the fingers 11 on the guide rod 2 through a vertical component force caused depending on the bevel angle bz beveled surface 14.

On the other hand, segments 8 of the core of the second group are excellent

from segments 7 of the first group, are not connected to the base 3, but only concern the rear end part of the ring 13 connected with segments 7 of the first group. However, these elements are crimped on the rod 2 by means of a vertical force caused by 3 dependencies on the segments 7 according to the pressure on the end portion of the plastic pipe, and therefore it can be stabilized better than in the case where the fixing of the segments 7 depends only on the pusher 27.

Accordingly, the segments 8 of the second group can be fixedly installed without being removed when pressure is applied to the front part of the plastic pipe.

The installation of segments 8 of the second group relates to the installation of core elements, which keeps the segments 8 with beveled surfaces 14 of the fingers 12, as well as

installation of mobile elements ser-. the gage - segments 8, the rear ends of which are held by the ring 13. Consequently, the pushers 23 and 31 can be limited to

functions of fastening and stabilization of segments 8 of the second core group. In the proposed device, the pressure of the end part of the plastic pipe can be efficient.

used to install segments 7 with fingers 11 of the first group and will not hold individual elements of the core of the second group at a pushing pressure so that these elements can be fixed, as are elements of the first group

In this way, the individual core elements can be prevented from sliding against each other, which ensures the fabrication

couplings with high dimensional accuracy. After the clutch is compressed

removing the core from it by moving the core elements at the beginning of the second group using the pushrod 31 of the hydraulic cylinder 30. The core elements of the second group are removed using the pushrod 27 connected to the flange 25 of the sleeve 23, as shown in FIG. . Since the fingers of the second group of core are removed, the segments 8 of the second group can go down to the axis of the guide rod 2, as shown in Fig. 6. In the stage.

when the above lowering is completed, the protrusion 9 of the segments 8 of the second group comes out of the sleeve shown by the dotted line in FIG. 1. After this operation, the pusher 27 is removed by the hydraulic cylinder and the fingers 12 and 11 of the second and first groups of core elements are synchronously removed as shown in FIG. 7 The projections 9 of the segments 7 also come out of the coupling. The core is freely removed from the sleeve. Then the cycle repeats.

thirty

R

Gg 2A29Ya 1b

and.

 6

27

 ,

R

% g.

l

1b

15

12

Jv

Fig.8

VNIIPI Order 914/62 Circulation 640 Subscription Branch 1ShP Patent, Propulsion Uzhgorod, Projecto st., 4

Claims (3)

1. FORMING DEVICE FOR MANUFACTURING AN END CLUTCH FROM A PLASTIC TUBE, containing a core made in the form of alternating separate segments of two groups forming an annular surface, which are arranged to interact with the side surfaces between each other and having conical supporting surfaces, the outer surfaces of the segments being made with an annular protrusion the design of the annular grooves on the coupling, the guide rod, the alternating supporting movable relative to it located on its periphery two types of elements with conical external surfaces contacting with the possibility of longitudinal movement with the supporting surfaces of the segments for radial movement, and a shape covering the core, characterized in that, <in order to improve the quality of the manufactured coupling by providing a thickening of the pipe wall during its radial expansion, the outer surface of each segment of both groups has in the longitudinal direction at least two sections inclined in one direction <in the direction outward from the longitudinal axis of the heart nick and formed with diameters increasing towards the front end segment and disposed therebetween portion inclined inwardly relative to the longitudinal axis of the core. w a π »SU (s) 1215609> 2. The device according to claim 1, characterized in that one group of segments is installed with the possibility of radial and axial movement relative to the guide rod, and the other group of segments with front ends connected to the guide rod. 3, The device according to paragraphs. 1 and 2, characterized in that the supporting elements are made in the form of fingers movably connected to the supporting surfaces of the segments, the fingers of each group of segments being connected to separate drives for their movement along the guide rod, while the angle of inclination of the conical surfaces of the fingers is selected from the condition for self-braking fingers on the guide rod.