DE2933924A1 - PIPE PRODUCTION DEVICE AND METHOD - Google Patents

Description

Pipe making apparatus and method

The invention relates to the manufacture of pipes made of concrete or other cementitious material, in particular the manufacture of pipes using the generally known as that Roller suspension method known method. The basic roller suspension method is in US Pat Australian patent 118 079. This process creates a tubular shape with open ends on one or suspended from a plurality of horizontal suspension rollers that extend lengthways through the mold, and the mold is rotated by driving the suspension roller, or at least by driving one of the suspension rollers when there are two or more such rollers. A cementitious material, e.g. concrete, is inserted into the rotating mold so that it spreads evenly around the mold by centrifugal force

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is, and is compacted by the suspension roller or rollers.

The shapes of those described in Australian Patent 118 079 for performing the roll suspension process Devices have proven very successful and devices of this type are still in service *. Later Australian patent specification 430 389 discloses a modified type of roll suspension device, which is particularly suitable for the mass production of pipes and in which the pipe shapes are treated individually is greatly reduced.

The invention sees certain changes from the original Roll suspension method and the associated device before, which makes it possible to finish the process improve the inside of the pipe and reduce sagging in the pipe wall. The modifications of the present Invention may be used in combination with certain other improvements that are the subject of US Pat Patent application "Method and device for the production of pipes" by the same applicant with the same priority and with the same filing date.

The present invention proposes an apparatus for manufacturing of tubes in front, which have a tubular shape for the tube, one or more elongated, generally horizontal running mold suspension rollers running lengthways extend within the tubular shape and carry it from the inside, a drive device for rotating the drive on the suspension roller or the -rolls held shape, whereby a pipe by introducing a cementitious material into the rotating Mold can be formed to form a pipe wall that is compacted by the support roller or rollers, as well as a form-lifting device which can be actuated in such a way that it moves the pipe form relative to the form-holder

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roller or rollers lifts when the mold rotates and that there is a circumferential speed difference between the Support roller or rollers and the pipe wall generated while the support roller is in contact with the rotating Pipe wall remains, thereby grinding or polishing the inner surface of the pipe wall.

The mold lift assembly may include two sets of mold lift wheels adapted to engage the exterior of the mold are determined approximately in the region of the two opposite ends of the mold, as well as a wheel lifting device, the such it can be actuated that it lifts these wheels or rollers and thereby the mold.

The invention also proposes a method for producing a tube in which a tubular shape for the Pipe is supported by a suspension roller or rollers which run longitudinally within the mold in which the mold thus held rotates, in which a cementitious material is poured into the mold thus held and rotated to be formed a pipe wall compacted by the suspension roller or rollers is introduced into the mold, and in which the rotating pipe form is raised relative to the support roller or rollers in order to compact the pipe wall end, and at which a circumferential speed difference is generated between the support roller or rollers and the pipe wall while the suspension roller is still in contact with the pipe wall, thereby grinding or polishing the inner surface of the pipe wall.

The invention thus has a roller suspension method and an apparatus for making pipes from concrete or other cementitious materials. A tubular Form with open ends for the pipe is suspended from a horizontal suspension roller passed through the Shape runs, and the shape is made by driving the

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hanging roller set in rotation. Cementitious material is fed into the rotating mold so that it is spread evenly around the mold and is compacted by the suspension roller. After compacting the pipe wall
Lower sets of wheels are raised to raise the shape and allow it to be reduced with
Speed rotates. Subsequent decrease of the
Compaction pressure and a circumferential speed difference between the support roller and the rotating pipe wall causes the support roller to grind or polish the inner surface of the pipe wall, thereby reducing sagging or pressure marks in the pipe wall,
when the shape comes to a standstill.

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Further features, details and advantages of the invention emerge from the following description of a preferred one Embodiment and based on the drawing. Here show:

1 shows a side view of a roller suspension device designed according to the invention;

Fig. 2 is a vertical cross-section along line 2-2 in Fig. 1, the device just building and compacting a pipe wall within a mold;

FIG. 3 shows a cross section corresponding to FIG. 2, the device in is a position in which pipe making is finished;

The apparatus shown includes a main machine frame 11 which has a horizontal mold suspension roller 12 for Bracket of a tubular, made of steel tubular shape 13 carries. At one end of the machine, that as that is referred to rear end, the roller 12 is mounted in a bearing 14 and with one of a not shown Electric motor driven drive shaft 15 connected. At the other, front end of the machine is the roller 12

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stored in a bearing 16 which is mounted in a swing gate that can be pivoted outward to open the front of the machine when pipe forming to be inserted and / or removed.

The tubular shape 13 includes the usual cylindrical main portion 17 and an enlarged cylindrical end portion 18, within which the pipe socket end is formed shall be. The two ends of the mold 13 have inner races which are intended to run on the suspension roller 12, while the wall of the pipe is being built.

The illustrated roll suspension device, as far as it has been described so far, is of conventional construction. In contrast to the usual equipment, however, the apparatus shown is with two sets of top compression wheels 19 and two sets of lower mold lift wheels 21, and also the mold 13 is on theirs The ends are provided with outer races 23 on which these wheels 19 and 21 are intended to engage. The races 23 can Be steel rings which are welded to the tubular shape in such a way that they protrude outward in the radial direction and revolve around the ends of the mold 13.

The upper compression wheels 19 are in two pairs, one front and a rear pair, the arrangement being made such that the races 23 engage on opposite ends of the mold, and the wheels of each pair are on opposite sides a central vertical plane through the axis of the mold holding roller 12. The wheels 19 of each pair are mounted on axles 26 carried at the outer ends of a pair of double-plate levers 27, the inner ones Ends are pivotally connected with the aid of pins 28 to a component 25 which is attached to the main machine frame 11 and a hydraulic cylinder 29 houses.

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The piston rod 31 of the hydraulic cylinder 29 is provided with a transverse arm 32, at the ends of which the upper ends a pair of push rods 33 are pivotably articulated by means of pins 34. The lower ends of the push rods 33 are hinged to the middle sections of the levers 27 with the aid of pins 35. The hydraulic cylinder can be operated to move the push rods 33 up and down, causing the levers 27 to their inner Pin connections are pivoted with the component 25 and thereby raise and lower the wheels 19. The hydraulic cylinders 2 9 for the two sets of wheels are hydraulically connected so that both sets of rollers or wheels can be raised and lowered together.

The upper wheels 19 at the front end of the device have circumferential grooves 36 which run on the corresponding outer race 23 of the mold 13 and thereby the Define the shape 13 in the axial direction of the support roller 12. Have the upper wheels 19 on the rear of the device smooth cylindrical edges 37.

The lower wheels 21 for lifting the mold 13 are also arranged in two pairs, with one pair at each end of the mold. Each pair of the lift wheels 21 is open attached to a pair of parallelogram links consisting of the lever rods 41, 42 and 43.

The upper lever rods 41 of these links are on the Machine frame 11 pivotally mounted by means of pins 44 and mounting arms 45, and carry their outer ends Shafts 46 for the lift wheels 21. Each lever bar 42 includes a pair of spaced plates that are pivotable with the corresponding wheel shaft 46 on the opposite sides of the wheel 21 are connected. The other end of the lever rod 42 carries a pivot pin 47, whereby it is connected to the corresponding lever rod 43, which is also is formed from double panels. The lower lever bars 43

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the parallelogram links are rigid with a pair connected by shafts 48 which each extend along each side of the device and to the machine frame 11 with With the help of the ends of the shafts 48 bearing mounting sockets 49 are attached. These waves 48 can by an actuating mechanism 51 can be rotated in the opposite direction, whereby the parallelogram connections can be moved to raise or lower the wheels 21.

The operating mechanism 51 includes a pair of lever arms 52 that extend outwardly from the shafts 48 and are connected by a connection 53 formed by two parallel plates 53A. The connection 53 can through Actuation of a hydraulic cylinder unit 55 are moved, which is arranged between the plates 53 A. The cylinder of the unit 55 is connected to a fixed abutment 60 via a pin 56, and the piston rod is connected to the Connection 53 is connected in an articulated manner via an adjustable screw thread connection 57. The extension of the cylinder unit 55 causes the shafts to rotate in opposite directions in directions that connect the parallelogram upwards To raise the wheels 21, pivot them into the position shown in FIG. 3, while the shortening of the unit 55 causes opposite rotations of the shafts 48 to lower the wheels 21 in the position shown in Fig.2.

As shown in Figure 3 are the parallelogram connections attached to the machine frame such that when the wheels 21 for engagement with the races 23 and 24 of the Form 13 are raised, the lever rods 41 and 43 are substantially horizontal and the wheels 21 therefore can be moved substantially vertically from the suspension roller 12 to raise the mold. The lifting rollers resp. Wheels 21 on the front of the device have circumferential grooves 58 which are on the front race 23 of the mold

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run and thereby maintain the position of the mold in the axial direction of the holding roller 12.

When operating the illustrated apparatus, the mold is initially supported on the roller 12, both the upper Compression wheels 19 as well as the lower lifting wheels 21 are in the retracted position, i.e. with the upper wheels raised and the lift wheels lowered. The suspension roller 12 is then driven by an electric drive motor to set the mold in rotation, and the upper compression wheels 19 are lowered by operating the corresponding hydraulic cylinder 2 9 forced to press the mold 13 firmly against the support roller. Concrete does not get into the form with the help of one Introduced conveyor belt shown, which penetrates into the form and traverses this in the longitudinal direction, so that Concrete is discharged along the length of the form. The concrete is evenly distributed around the mold, around a pipe wall which is compacted by the suspension roller 12. As the upper wheels 19 push the mold down, much larger compaction forces are generated than in a conventional roller suspension device in which the compression forces only due to the weight of the mold and of their content. In addition, the upper wheels 19 serve to keep the shape in a stable Hold position during filling and compression.

When a compacted pipe wall is formed within the pipe shape, the upper wheels 19 are retracted. and the lower wheels 21 are also raised to slowly form the tube shape opposite the suspension roller 12 to raise. As the mold is slowly raised, it passes through a position where the suspension roller 12 is a maintains slight contact with the pipe wall. In this Stage, the suspension roller does not noticeably compact the pipe wall and can no longer drive the pipe shape,

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the rotation of which therefore slows down and finally comes to rest. As soon as the rotation of the shape slows down, there is a circumferential speed difference between the Suspension roller 12 and the pipe wall in that the suspension roller 12 continues at a relatively high speed rotates and the pipe wall gradually slows down and finally stops. The rotating suspension roller 12 therefore performs a grinding or finishing action on the inner surface of the pipe, so that the The need for subsequent smoothing processing is eliminated or reduced, as is currently the case. carried out on pipes which are manufactured using the roller suspension process. The shape is so long from the lifting wheels raised until the pipe is removed from the suspension roller, see Fig. 3.

The illustrated device enables many significant improvements over conventional roll suspension devices. First of all, it is possible to seal a completely solid and dense concrete with less cement than before reach. This is caused not only by the increased compression achieved, but also by the fact that The compaction time can be reduced to pulverization of the aggregate in the concrete. In addition, more matching conditions can be created reproduce.

The upper wheels also greatly reduce a lateral Swinging and vertical jumping of the mold during filling and compacting. With conventional Roller suspension devices swing the mold violently during filling and jump in the vertical direction, if aggregate between the suspension roller and the inner races is held in place. These movements of the Shape considerably limit the size of the concrete conveyor that can be inserted into the mold, and hence the rate at which the mold can be filled.

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In the device according to the invention, the shape is in held in a fixed position and can be filled much faster. The operating noise level can be affected by the Preventing the mold from bursting can also be greatly reduced. The compression and lifting wheels can with Steel-rimmed rubber inserts or sleeves contain to reduce operating noise and vibration to absorb.

The running of the grooved wheels on the front race of the mold sets the longitudinal position of the mold the suspension roller and thus ensures a much better fixation than with conventional devices, in which one must provide stop rings arranged on the suspension roller. Own the outer races also an enlarged contact surface and therefore a longer service life than conventional stop rings

As already mentioned, the presence of the mold lifting wheels enables that the inner surface of the pipe is mechanically smooth-finished by the suspension roller before the The shape is removed from the machine, thereby eliminating ^ the need for subsequent hand smoothing. Raising the mold in this manner also avoids the problem of pipe wall sagging, as is sometimes the case with conventional devices due to the tendency of the concrete to adhere firmly to the suspension roller, when the pipe-filled mold comes to a standstill while it is still fully supported by the suspension roller will. The lower wheels can also be used to reduce the initial load on the main drive motor to reduce the fact that the mold can initially be carried on the lift wheels when the suspension roll begins to rotate, and that the lift wheels are then lowered to place the mold on the suspension roller.

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The illustrated embodiment was only given as an example described and can be provided with considerable changes. For example, a device can be provided for the To put mold lifting wheels in rotation so that they actively shape the mold at a lower peripheral speed than that Drive the speed of the suspension roller to extend the smoothing period. When the lower rollers or Wheels are driven, the main suspension roller could be braked and reversed in its direction of rotation to achieve better smoothing or grinding. A low speed drive device for the lower wheels would also make it easier to position the mold with the mold seam at the bottom before the mold is removed from the machine to prevent the pipe wall from sagging due to the air pressure acting through the molded seam to prevent.

Instead of reducing the force on the compaction wheels before lifting the mold, the device can for lifting the lifting wheels also be such that it is able to counteract the continued action of the upper To lift compaction wheels. In this case, the shape of the upper cadres could be active during the smoothing period are driven. The mold could of course also be driven by the top wheels during filling and compacting instead of being driven by the main support roller.

Although in the illustrated embodiment only the front Sets of the upper and lower wheels are grooved to ensure the axial fixation of the shape, could of course, the rear sets of wheels can additionally or alternatively be provided with grooves or flanges. The fitting of the tube can be at either end during manufacture. It is also not necessary that the front The suspension roller bearing is supported by a swing gate, as other devices could be used,

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to provide a releasable connection for loading and unloading the Form to be provided. For example, it is also known to provide horizontal arms carrying part-annular bearings that are inserted in Can be brought into contact with the suspension roller.

According to a further embodiment, the main suspension roller be movable in the longitudinal direction so that the molds are loaded into the machine from the side can, in the manner described in Australian Patent 430,389. It should be noted that the invention in no way extends to limited the details of the illustrated embodiment is, but that many changes fall within the scope of the claims.

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Claims (6)

Expectations (1.J device for the production of pipes with a tubular Mold for the pipe, at least one elongated, generally horizontal mold suspension roller, which runs in the longitudinal direction inside the tubular shape and carries it from the inside, and a drive device for the rotary drive of the mold held on the suspension roller or rollers, whereby a pipe passes through Introducing a cementitious material into the rotating mold to build up a pipe wall that is supported by the support roller is compacted, is formed, characterized by a mold lifting device for lifting the rotating mold (13) opposite the holding roller (12) and causing a circumferential speed difference 030011/0703 Postal check account Stuttgart CBLZ 600 100 703 429 3O-7OB Dresdner Benk Stuttgart CBLZ SOO800OO3 Account 9011341 A 18 106/7 -2 - rence between the support roller (12) and the pipe wall, while the support roller (12) in contact with the rotating Pipe wall remains, thereby grinding or polishing the inner surface of the pipe wall. 2.Vorrichtung according to claim 1, characterized in that the lifting device two for engagement with the exterior of the mold (13) approximately in the region of the two opposite one another Ends of the mold (13) certain sets of mold lifting wheels (21) as well as a wheel lifting device which can be actuated in such a way that it lifts the wheels (21) and thereby the shape (13) raises. 3.Vorrichtung according to claim 2, characterized in that the mold (13) radially outwardly projecting circumferential outer races (23) in the region of their opposite ends for engaging the two sets of mold lift wheels (21) with at least one wheel at least one of the wheel sets (21) a circumferential groove (58) or a circumferential flange for running on the corresponding race (23) the shape (13). 4. A method for producing a pipe, in which a tubular Form for the tube of at least one suspension roller is held, which extends in the longitudinal direction in the mold, in which the shape thus held rotated and a cementitious material is introduced into the mold thus held and rotating to build up a pipe wall, which is compacted by the suspension roller, in the mold characterized in that the rotating mold (13) is raised relative to the suspension roller (12) or rollers, around the Compression of the pipe wall to end, and that a circumferential speed difference is generated between the suspension roller (12) and the pipe wall, while the suspension roller (12) is still in contact with the pipe wall, thereby grinding or polishing the inner surface of the pipe wall. 03 0011/0703 A 18 106/7 - 3 - 5. The method according to claim 4, characterized in that the tubular shape (13) during the compression of the pipe wall is rotated by driving the support roller (12) is, and that the rotating tubular mold (13) is raised with the help of wheels (21) on which the mold (13) rotates at a reduced speed. 6. The method according to claim 5, characterized in that the mold (13) of the wheels (21) is raised so that it is freely supported by the support roller (12) or rollers and rotates at a reduced speed can until it comes to a standstill. 030011/0703