RU2712605C1 - Machine for continuous production of corrugated pipe - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention relates to machines for continuous production of corrugated pipe. Machine (1) for continuous production of corrugated pipe includes a plurality of molding assemblies (S), each having a surface and a cavity open on said surface, as well as a first annular track and a second annular track located side by side, to move said molding assemblies (S) along a closed path. Each of said tracks comprises connecting part, along which surfaces of first track forming units contact with surfaces of second track forming units so that corresponding cavities form full matrix for part of corrugated pipe, and determining a connecting plane comprising said connected surfaces, a curved front portion located in front of the connecting portion, and a mating guiding means adapted to direct the molding modules along the track. Response guide means comprises a plate having a lower side, an upper side and a predetermined thickness, wherein on the upper side the first continuous slot is made, and on the lower side – the second slot, with which the molding units (S) are engaged with possibility of sliding.

EFFECT: simplified design of machine for continuous production of corrugated pipe.

4 cl, 12 dwg

Description

The invention relates to the field of machines for the continuous production of corrugated pipes from plastic.

Such machines are equipped with two groups of shapes moving in a closed circuit along two adjacent ring tracks. Each mold contains an open cavity that forms half of the matrix to form part of the corrugated pipe. In the area between the two tracks, along a predetermined part, the shapes of the first group are placed opposite the shapes of the second group so that the cavities of the first and second shapes mate and form a complete matrix.

The plastic is injected into the matrix, and it is distributed along the walls of the matrix, forming part of the corrugated pipe.

At the end of the connecting part, two forms are separated and the indicated part of the molded pipe is released. Continuous movement of the molds one after the other along the connecting part enables the molding of the individual parts of the corrugated pipe arranged successively one after another, which together form the whole corrugated pipe.

At the end of the connecting part, the forms that are disconnected from each other are moved to the corresponding return section of the ring track, along which they again move to the beginning of the connecting part.

There are many different options for the implementation of machines for the continuous production of corrugated pipes. A traditional solution is disclosed, for example, in patent document DE 3810915 C1.

They are very complex machines in which, in addition to the means necessary for guiding and moving groups of molds, it is necessary to provide means for creating a vacuum in the matrix, means for cooling the molds, means for lubricating the molds and other means.

Therefore, it is clear that the companies involved in the design and implementation of such machines are making significant efforts to simplify them.

The objective of the invention is to meet the needs of the industry and at the same time create a machine of less complex design.

The problem is solved by means of a machine for the production of a continuous corrugated pipe according to paragraph 1 of the formula. The dependent claims characterize additional embodiments of the invention.

The features and advantages of the machine according to the invention will become clearer from the following description by non-limiting example with reference to the drawings.

In FIG. 1 shows a diagram of a machine for the continuous production of corrugated pipes according to an embodiment of the invention;

in FIG. 2 is a diagram of the machine shown in FIG. 1;

in FIG. 3, 4 and 5 are diagrams of the front of the machine according to an embodiment of the invention, in successive steps of moving the molding units;

in FIG. 6 is a mold support of a molding unit according to an embodiment;

in FIG. 7 is a molding assembly comprising a mold support shown in FIG. 6;

in FIG. 8 is a diagram of the front of the machine showing the guide grooves defining the path of the molding units;

in FIG. 9 is a diagram of the front of the machine;

in FIG. 10 - front part of the machine shown in FIG. 9 is a cross-sectional view along the X-X plane of FIG. 9;

in FIG. 11 shows drive means of a machine according to a preferred embodiment, a perspective view;

in FIG. 12 illustrates drive means of a machine according to a preferred embodiment.

According to the invention, the machine 1 for the continuous production of corrugated plastic pipes is connected to an extruder 2 for extruding plastic (FIGS. 1 and 2).

Machine 1 includes a first ring track 4 and a second ring track 6 located side by side. In the middle between the indicated tracks 4, 6, the connecting plane Pa is defined.

Forming nodes S are moved along these tracks, which according to an embodiment consist of a mold support S 'and a mold S' 'attached to the corresponding support S' and containing an open cavity defining half the matrix of the corrugated pipe part to be made.

According to another possible embodiment, the molding unit is an integral part with a cavity inside.

Along each track 4, 6 there passes a rectilinear connecting part 8 located parallel to the connecting plane Pa, on which the shapes S ″ of the two tracks are connected, forming a complete matrix I corresponding to the cross section of the corrugated pipe. In the direction of movement of the forms, a curved rear part 10, a return part 12, generally straight, and a curved front part 14 are sequentially arranged.

The machine 1 also includes a front kinematic device 20 located, respectively, next to the front part 14, and a rear kinematic device 22, located, respectively, next to the rear part 10, which can engage with the molding units S and move them along the respective tracks 4, 6.

Preferably, the front kinematic device 20 comprises at least one input gear 30, the dimensions and position of which allow engagement with the molding units S at the output of the return part 12 moving to the front part 14 (Fig. 3).

In addition, preferably, the front kinematic device 20 includes at least one output gear 32, the dimensions and position of which enable it to engage with the molding units S entering the connecting part 8 at the moment when they disengage from the input gear wheel 30.

According to a preferred embodiment, the input gear 30 is a drive gear, i.e. driven directly from the geared motor, the output gear 32 is kinematically connected to the input wheel 30 and rotated from it.

The front kinematic device 20, for example, may include a gear gear 34 engaged with the input gear 30 and the output gear 32 to transmit torque from the input gear 30 to the output gear 32.

During normal operation of the machine, several forming units Si are prepared to move to the front part 14 (see Fig. 3).

These Si molding units are moved by the molding units following them; for example, the first molding unit Si1 is pushed by the second molding unit Si2, which, in turn, is pushed by the third molding unit Si3.

As a result of pushing, the first molding unit Si is engaged with the input gear 30 of the front kinematic device 20; the specified input gear 30 engages with the incoming forming unit Si1 and moves it along the front part 14, separating from the next forming unit Si2, to the exit from the front part 14, towards the connecting part 8 of the track 4 (Fig. 4) .

At the exit from the front part 14, several molding units Su are ready to follow the connecting part 8 (Fig. 5).

At the moment when the first molding unit Su1 disengages from the input gear 30, it engages with the output gear 32 to be shifted towards the connecting part 8.

At the moment when the first outgoing forming unit Su1 is disengaged from the input gear 30 and engages with the output gear 32, said first forming unit Su1 is still separated from the connecting plane Pa; in other words, between the surface Ac of the molding unit Su1, on which the cavity C is open, and the connecting plane Pa, there is a gap G.

Then, the first exit molding unit Su1 is moved by the output gear 32 and guided so that a lateral movement such that the gap G between the indicated surface Ac and the connecting plane Pa disappears, and the surface Ac is located on the specified connecting plane Pa.

When pushed through the connecting part, the molding units Su push each other; for example, the second exit forming unit Su2 pushes the third exit forming unit Su3. All pushing action as a whole is provided by the output gear 32.

According to a preferred embodiment (FIGS. 6 and 7), the mold support S ′ includes a housing 100, generally made in the form of a solid steel part with a recess 102 extending through the longitudinal direction.

The housing 100 also includes a support wall 104 defining a recess 102 in the transverse direction on one side and intended to attach to it a form S ″; in addition, the housing 100 includes a lower wall 106 and an upper wall 108 extending from the supporting wall 104 and forming the lower and upper boundaries of the specified recess 102.

On the side opposite to the supporting wall 104, the walls 106,108 contain teeth 110, 112 for engaging with the kinematic devices 20, 22 of the machine 1.

In addition, preferably, the housing 100 comprises guiding means for engaging with the molding unit S with reciprocal guiding means of the machine 1 to guide the molding units S along tracks 4, 6.

For example, these guide means may include an upper finger 114 protruding from the upper wall 108 into the inward recess 102, and a lower finger 116 protruding from the lower wall 106 into the inward recess 102.

Preferably, said fingers 114, 116 are non-driven, which is done to facilitate sliding along said guides.

In addition, preferably, said fingers are offset relative to each other in the longitudinal direction; in other words, the axis of the first finger is offset relative to the axis of the second finger in the longitudinal direction, which is done to ensure the stability of the molding unit during movement.

According to another possible embodiment (not shown), the molding unit S, made in the form of an integral part, may have guide means in the form of guide walls adapted to come into contact with the reciprocal guiding means of the machine.

As already mentioned, the machine 1 comprises a response guide means adapted to come into contact with the guide means of the molding unit S.

Said response guide means is a base plate 200 extending between the front and rear of the machine (see FIG. 8).

The plate 200, having a lower side, an upper side and a predetermined thickness, comprises a first continuous groove 202 (shown by a solid line in Fig. 8) made, for example, on the upper side, which serves as a guide for the first finger 114 of the molding unit S, and the second a continuous groove 204 (shown by the dotted lines in FIGS. 8, 9 and 10), for example, made on the lower side, which serves as a guide for the second finger 116 of the molding unit S.

Thus, these grooves 202, 204 are located with each other in the vertical direction.

At the exit of the curved front portion 14, between positions in which the first outgoing molding unit Su1 is disengaged from the input gear 30 and engages with the output gear 32, one of these grooves 202, 204, for example, the first groove 202, has two parts, namely, the first input part 202a deflecting into the track 4, 6, and the second part 202b located behind it, deflecting outward from the track 4, 6.

The successive exit portions 202a and 202b function as a cam device, moving the first exit molding unit Su1 laterally so that the gap G between the surface Ac and the connecting plane Pa disappears and the surface Ac is located on the connecting plane Pa.

According to a preferred embodiment, the front kinematic device 20 comprises a pair of coaxial output gears, in particular, a lower output gear 32a mounted below the plate 200 and an upper output gear 32b mounted above the plate 200; in addition, preferably, the front kinematic device 20 comprises a pair of coaxial gears, in particular a lower gear gear 34a mounted below the plate 200 and an upper gear gear 34b mounted above the plate 200 (see FIG. 11).

According to a preferred embodiment, the rear kinematic device 22 is structurally and functionally identical to the front kinematic device 20.

In addition, the machine 1 contains a drive means suitable for driving these kinematic devices 20, 22.

For example, said drive means may be a single electric motor 300 mounted, for example, on the earth's surface T, in an intermediate position, preferably in the center, between the respective plates 200 of the first track 4 and the second track 6.

The drive means of each track 4, 6 also contains a first shaft 302 connected to an electric motor, usually horizontal, i.e. the axis of which runs parallel to the earth’s surface T, the return device 304, and the second shaft 306, usually vertical, i.e. whose axis is perpendicular to the earth's surface T.

The return device 304 receives torque from the first horizontal shaft 302 and transfers it to the second vertical shaft 306.

The second shaft 306 is operatively connected to the input gear 30 and drives it.

Thanks to the presence of one electric motor, which drives the input kinematic devices 20 of both tracks, excellent synchronization of the motion of the molding units S is ensured, which is important for optimal alignment on the connecting plane Pa.

In addition, the drive means comprises transmission means for transmitting movement from the front kinematic device 20 to the rear kinematic device 22 (or, alternatively, vice versa).

The specified transmission means can be performed, for example, in the form of a circuit 320, which engages with the front device 20, which operates as a power take-off device, and with the rear device 22, for driving the latter (see Fig. 12).

Preferably, said transmission means makes it possible to synchronize the movement of the front devices with the movement of the rear devices.

Furthermore, preferably, the circuit also carries an integral part of the mold cooling circuit.

The advantage of the machine according to the invention is that it eliminates the disadvantages of the prior art, as it is simple in design, especially in the part that allows you to direct the forming nodes.

In particular, it is preferable, in addition, the response guide means prevents a collision between the forming units exiting from the front of two adjacent tracks.

It will be clear to a person skilled in the art that to meet the additional needs of the machine described above, changes and modifications may be made, and all these changes and modifications are covered by the scope of rights defined by the claims.

Claims (12)

1. Machine (1) for the continuous production of corrugated pipes, including: - a plurality of molding units (S), each of which has a surface (Ac) and a cavity (C) open on said surface (Ac); - the first ring track (4) and the second ring track (6), located side by side, to move the specified molding units (S) in a closed loop, each of these tracks (4, 6) contains: i) the connecting part (8) along which the surfaces (Ac) of the molding units of the first track (4) are in contact with the surfaces (Ac) of the forming units of the second track (6) so that the corresponding cavities (C) form the complete matrix (I) for the part a corrugated pipe, and a connecting plane (Pa) is defined containing said joined surfaces (Ac); ii) a curved front part (14) located in front of the connecting part (8); - response guiding means adapted to guide the molding units along the track (4, 6), containing: i) a plate (200) having a lower side, an upper side and a predetermined thickness, the first continuous annular groove (202) being made on the upper side and the second groove on the lower side, with which the forming units (S) engage slip. 2. Machine (1) according to claim 1, in which between the end of the front part and the beginning of the connecting part, the predefined molding unit (S) has a corresponding surface (Ac) located at a distance from the connecting plane (Pa); wherein said response guide means is a cam device (202a, 202b) cooperating with said predetermined molding unit (S) to move it so that said surface (Ac) is located on the connecting plane (Pa). 3. The machine according to 1, in which the guiding means of the molding unit (S) comprises a first finger (114) made with the possibility of sliding in the first groove (202), and a second finger (116) made with the possibility of sliding in the second groove (204) . 4. The machine according to claim 3, in which these fingers (114, 116) are offset in the longitudinal direction.

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