DE2433946A1 - Device for joining and separating large plastic pipes - applies tension to clamps to reduce pipe diameters - Google Patents

Abstract

The device consists of two pairs of half clamps. Each pair is joined by hinge (21) with an eccentric hinge pin fitted with a lever. Rotating the lever provides a coarse adjustment of the clamping force. The ends of the clamp opposite to the hinge are secured to each other by claws from one end of the clamp gripping a ledge on the mating end. This grip is provided with a fine clamping adjustment by a double threaded turnbuckle which is rotated by the fork end of the piston rod of the hydraulic jack (7). Further travel of the jack (7) pulls the tube (29) inside the tube (27).

Description

Device for connecting or disconnecting from one another at the ends inserted hollow bodies by means of pressure The invention relates to a device for Connect or

Loosening of hollow bodies inserted one into the other at the ends by means of pressure, preferably from plastic pipes provided with an adhesive at the ends.

Pipes of a certain size can no longer be interlocked by hand and connect with each other by pressing.

For this purpose, tension chains have been used so far, as they are, for. B. at Pipe wrenches are used as a caterpillar track to pull the two together connecting pipes attached. The tension is applied manually or using a lever set. The chains are then also via a lever transmission drawn towards each other. However, this known method is very time-consuming, so that there is a risk that with an adhesive connection the adhesive that is used with plastic pipes yes, the pipe surface dissolves directly, was already partially hardened, so that with unfavorable Under certain circumstances, the two pipes could no longer be completely connected to one another. With the known device, prints of any size cannot be made will.

The invention avoids these disadvantages. It is based on the task a device for connecting or disconnecting those plugged into one another at the ends To propose hollow bodies by means of pressure, which is characterized by a high working speed with a good quality of the connection.

To solve this problem, the invention is characterized in that that two halves of the strap each hinge with one another Tensioning straps are provided which are variable over lengths distributed over the circumference elements are connected to each other approximately coaxially, that each of the two halves of the strap over Snap locks can be connected to one another, and that at least one of the tightening straps a coarse tension lock and a fine tension lock, which when shortened of the elements is attracted.

For connecting two such hollow bodies, in particular pipes, therefore only need the two tensioning straps with the two hollow bodies to be connected that the two straps around the two hollow bodies, preferably the two pipes are laid around in the area of the common junction. By engaging the snap locks, both tensioning straps are closed. Subsequently, at least one of the tensioning straps is roughly tensioned thereby, i. H.

contracted in the radial direction that the coarse tension lock is attracted. Immediately afterwards, the variable-length elements can be moved in are, whereby then in the axial direction of the tensioning straps and thus also of the two Pipes, the required connection pressure is applied. To do this a slip To avoid the tensioning straps on the outer wall of the tubes is still according to the invention provided that when pulling in the variable-length elements at the same time Fine tension lock is tightened on at least one of the straps, whereby the Holding force of this strap on the outer wall of the pipe is increased accordingly.

The indication of the fine tension lock with the actuation of the longitudinally variable Elements enables a high working speed to a large extent, by which the disadvantages of the known device described above are avoided will.

With the device according to the invention do not necessarily have to round tubes are connected to each other. Rather, the pipes can also be different be profiled, in which case the straps are to be profiled accordingly. this happens because on the inside of the tightening straps profiled accordingly Profile pieces are attached.

To release the device after the connection has been established, an the top of both straps handle be provided with the respective Snap lock are connected and solve this when lifting the device. This also further increases the operating speed, so that the device can be quickly applied to the next connection after a connection has been established can.

The Crob tension lock and the Fsin tension lock only need to be provided to one of the tightening straps because the other tightening strap is on one Can create a collar with an expanded circumference of the hollow body or pipe in question, because it is assumed that both hollow bodies or tubes with their ends into one another be plugged so that the outer Hollow body or the outer tube there has a step-like enlarged diameter.

So that the pressure exerted on the hollow body in question during clamping acts evenly, and also to an adaptation to a certain extent on hollow bodies To achieve different diameters, it is preferred if on the inside at least one of the tensioning straps are attached to the studs distributed over the circumference can.

It is preferred if the variable-length elements are double-acting Piston-cylinder assemblies are formed. These elements can then be added to simple Way can be extended or withdrawn by the arrangement accordingly with hydraulic pressure is applied. This hydraulic pressure is preferably on one of the Tensioning straps supplied by the self-attached motor, making the device very mobile can be used. The motor is, for example, an electric motor that has a cable is supplied by a suitable voltage source. He provides the necessary hydraulic pressure.

Regarding the connection of the variable-length elements with the It is preferred if a lever is pivotable on the piston rod is attached, whose the other end rotatably with a threaded rod is connected, at the ends of which two are firmly connected to the two halves of the strap Nuts run with opposing threads.

When looking at the piston rod, the lever is turned around pivoted certain Ulinkelbstrag, causing the two halves of the strap to each other be pulled because the nuts and thus the two ends of the threaded rod have an opposing thread (right-hand or left-hand thread). In appropriate The fine tension lock is released when the piston rod is extended.

With regard to the coarse tension lock, it is preferred if this is formed by at least one crankshaft-ready cell on which an actuating lever attacks. This is also a particularly simple solution in terms of design.

To release the connection, a rod can be connected to a tension band which is supported with a nose on a projection of one of the hollow bodies. With this additional rod, the device described can otherwise remain unchanged can also be used to loosen such connections.

The invention is explained in more detail below with the aid of exemplary embodiments explains which other important features result.

1 shows a device according to the invention in perspective prior to placing on two plastic pipes to be connected to one another, FIG. 2 shows the device according to FIG. 1 with additional rod for releasing, the device being connected to two plastic pipes is applied; Fig. 3 shows a detail of the device, namely the snap lock with Bowden pulls that lead to the handles; Fig. 4 shows a further detail of the Device, namely the coarse tension lock; Fig. 5 shows a third detail, namely the fine tension lock; Fig. 6 shows a cross section through a tensioning strap with gas ten profile pieces for processing non-circular profiled pipes.

In Figures 1 and 2, a device is shown, which consists of two Straps 1 and 2 are made. Both tightening straps each consist of tightening strap halves 3 and 4, or 5 and 6. The two straps 1 and 2 are hydraulic cylinders 7 and 8 connected to one another, preferably at opposite points attack the circumference of the two straps.

Both hydraulic cylinders are connected by oil pressure lines 9 and 10 a hydraulic pump 11 is connected to a drive motor (electric motor) 12. the The piston rod 13 of the two hydraulic cylinders can move in the direction of the double arrow 14 are moved so that the piston-cylinder arrangement depending on the action of the cylinder can be extended or retracted with hydraulic fluid. The hydraulic cylinders are double acting.

Handles 15 and 16 are attached to the straps 1 and 2, with which the entire device is carried.

FIG. 2 shows how the device is placed over two tubes 26, 29. The tube 26 is widened in a known manner at its end to be connected. the Extension bears item number 27. This forms a shoulder 28.

The snap lock 17 is shown in Figures 1 and 3 in detail. It has locking hooks 18 which are attached to the free end of the tension band half 3, and a guide tongue 19 between the locking hooks 18. FIG. 3 shows that the locking hooks 18 are drawn together by a spring 50 so that they are behind a shoulder 51 grab, which is provided on the other clamping wall half 4.

When carrying or lifting the device by the handles 15 and 16 the two locking hooks -18 in the in Figure 3 position shown pulled outwardly against the force of spring 50 so that they release the lock. This takes place via Bowden cables 52 and 53, which are connected to the handles 15, 16.

The coarse tension lock 21 is shown in FIGS. It has two levers 22 and 23, each with an eccentric shaft 54, 55 in a rotationally fixed manner are connected. Bearings 56 of a connecting plate 57 are seated on the eccentric shafts.

In the position shown in Fig. 4, the coarse tension lock is tensioned, d. H. the two halves of the strap 3 and 4 are related to each other. In this situation both levers 22 and 23 point outwards. Will both levers be opposite this location pivoted inward by about 1800, so that they both on the connecting plate 57 about to be applied, the coarse tension lock is released.

Figure 5 shows the fine tension lock in detail. It can be seen from this that the piston rod 13 engages a pivotable lever 59 via a fork 58, which sits non-rotatably on a threaded rod, which is indicated at item 60. on The threaded rod runs two nuts 61 and 62. One of the nuts has a right-hand thread and the other a left-hand thread.

The threaded rod 60 has corresponding threaded ends. Both Nuts are welded to the ends of the tension band halves 3 and 4, respectively. By pivoting of the lever 59, the two tension band halves 3 and 4 are thus moved towards one another or moved away from each other, depending on the pivoting direction of the lever 59 about pivot axis 60.

As a result, the fine tension lock is released in the manner described, or tightened. Depending on the pitch of the threaded rod 60 and the nuts 61 and 62 used thread can be the displacement of the ends of the Clamping band halves 3 and 4 are adapted to the respective conditions, d. H. greater or made smaller.

Figure 2 shows how the device for use when releasing the two tubes 26 and 29 is provided with an additional rod 36 which is attached to the Clamping band half 3 is firmly connected. The rod 36 has a radially in FIG. 2 inwardly pointing nose 37, which therefore rests against the end face of the sleeve 27. To solve the connection, the piston-cylinder assemblies are pressurized, whereby the tensioning strap 1 is moved in the direction of arrow 38. over the nose 37 is thereby a pressure exerted on both tubes 26 and 29, which tries to release them. Simultaneously The fine tension lock 35 was tightened.

It can be seen that with the device according to the invention as desired profiled bodies can be connected and disconnected can that are not necessarily hollow. They don't even need to be pipes. The straps 1 and 2 must be shaped according to the profile of the body.

Figure 1 shows attached to the inside of the tensioning strap 1 Studs 20, which apply the pressure evenly to the corresponding body, preferably Apply a hollow body, preferably a plastic pipe. The connection of the plastic body preferably takes place via an adhesive, possibly dissolving adhesive underneath Application of pressure.

6 shows a cross section through one of the tensioning straps.

From this it can be seen that with the inside of the clamping band halves 3, 4 profile pieces 63, 64, 65, 66 are screwed. with this arrangement pipes connected or released, the profile of which corresponds to that profile of the profile piece 63 corresponds to 66. In the illustrated Ausführungsbeispicl these are tubes with a square profile.

The profile pieces also have cushions 67 on their inside for absorbing pressure. It is particularly advantageous if the profile pieces are still at the points 68 Support on the tension band halves 3 and 4.

The profile pieces are easily exchangeable so that they can be used as required can be.

Claims

Claims (7)

P a t e n t a n s p r ü c h e Device for connecting or disconnecting of hollow bodies plugged into one another at the ends by means of pressure, preferably of plastic pipes provided with an adhesive at the ends, d u r c h g e k e n n n z e i c h -n e t that two out of two hinge-like with each other connected clamping band halves t3, 4, 5, 6) existing clamping bands (1, 2) are provided are, which are distributed over the circumference variable-length elements (7, 8) with each other are connected approximately coaxially so that both halves of the strap are snap fasteners (17) can be connected to one another, and that at least one of the tensioning straps has a Coarse tension lock (21) and a fine tension lock t35), which when shortened of elements C7, 8) is attracted. 2. Apparatus according to claim 1, d a d u r c h g e k e n nz e i c h n e t that handles (15, 16) are provided on the upper side of both tensioning straps (1, 2) which are connected to the respective snap lock (17) and these at Loosen the lifting of the device. 3. Apparatus according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that at least one of the tensioning straps (1, 2) on the inside the circumference distributed studs (20) can be attached. 4. Apparatus according to claim 1 to 3, d a d u r c h g e k e n n z e i c h n e t that the variable-length elements (7, 8) as double-acting Piston-cylinder arrangements are formed. 5. Apparatus according to claim 4, d a d u r c h g e k e n nz e i c h n e t that a lever (59) is pivotably attached to the piston rod (13), whose the other end is rotatably connected to a threaded rod (60), on the ends two nuts (61, 62) firmly connected to the two clamping band halves (1, 2) counter-rotating threads. 6. Device according to claims 1 to 5, d a d u r c h g s k e n n z e i c h n e t that the coarse tension lock (21) by at least one crankshaft-like Shaft (54, 55) is formed, on which an actuating lever (22, 23) engages. 7. Device according to claims 1 to 6, d a d u r c h g e k e n n z e i c h n e t that a rod (36) with a tightening strap can be used to loosen a connection (1, 2) is connected, di8 with a nose (37) on a projection one of the hollow bodies (26, 29) is supported. 8, .Device according to claims 1 to 7, d a d u r c h g e k 8 n n z e i c h n e t that profile pieces are attached to the inside of the tensioning straps (1, 2) are.