RU2314923C1 - Device for welding of the plastic pipes - Google Patents

Abstract

FIELD: construction industry; natural gas industry; oil-producing industry; other industries; devices for welding of the plastic pipes.

SUBSTANCE: the invention is pertaining to the field of construction and may be used at laying-out, manufacture and repairs of the pipelines, in particular, in the technological equipment for enhancement of the functional capabilities of the devices which are used for the butt-seam welding of the plastic pipes. The device contains the cradle, the mobile and motionless carriages, on which the clamps for holding the pipes are tightened. The movable carriage contains two manual self-propelled drives. At that only one drive actuates the loading spring and is equipped with the screw, which ensures the spring compression. The other drive actuates only the lever and provides the idle motion of the movable carriage. The bracket, on which the shaft of the lever turning is fixed, is radially welded to the nut of the screw drive. On the opposite side from the first bracket there is the second bracket radially welded to the same screw drive nut. The indicated bracket has two radial grooves for provision of the possibility to fix the lever in two positions. The device also contains the feed spindle, on which the bushing is freely set. The bushing is moved by the lever through the thrust blocks and ensures the capability of the carriage passing through the loading spring. The invention ensures extension of the functional capabilities of the device, reduction of duration of the technological pause from the moment of the heater removal up to the pipes jointing.

EFFECT: the invention ensures extension of the functional capabilities of the device, reduction of duration of the technological pause.

2 cl, 3 dwg

Description

The invention relates to the field of construction and can be used in the laying, manufacturing and repair of pipelines, in particular in technological equipment to expand the functionality of devices that are used for butt welding of plastic pipes.

From (Yu.A. Novichenko, A.A. Persion, A.N. Shestopal. Handbook for the manufacture and installation of technological pipelines from polymeric materials, Kiev, 1979, p. 98) there is a known installation for resistance welding with pneumatic movement of calipers with clamps for pipes. The installation consists of a bed, movable calipers with clamps for pipes, a guide for moving the calipers, a pneumatic cylinder for controlling calipers with levers, a trimming tool and a heater.

Known installation works as follows. The pipes to be welded are fixed in the clamps of the calipers, if the ends of the pipes are not parallel, then a miter is installed between them. Using a pneumatic actuator, the ends of the pipes are pressed with a certain force to the end face. Using the miter drive, the pipe ends are milled. Then the ends of the pipes are bred with a pneumatic cylinder, the miter is removed from the installation, and a heater is installed in its place. The ends of the pipes are again reduced and pressed with a certain force to the heater, while the ends of the pipes are heated to the required depth. The heated ends of the pipes are bred, and the heater is removed from the installation, and then again, with a certain effort, the ends of the pipes are brought together and joined together with the subsequent formation of a weld bead. After holding a certain amount of time sufficient to cool the weld, the pipe welding ends.

Common features of the known and proposed devices are the following design features, namely, the compared devices include:

- bed;

- nodes for clamping pipes;

- guides for moving supports or carriages;

- leverage.

The disadvantages of the known device are:

- design features of the pneumatic actuator, namely that it requires high accuracy and purity of manufacture of mating parts;

- significant installation weight due to the presence of a pneumatic cylinder and its control system;

- the need to equip a place of work with a compressed air network or use a compressor;

- high cost of the device.

The closest (prototype) in technical essence and the achieved result is a device for welding plastic pipes, known from patent 2159183 (RU IPC ⁷ , B29C 65/02, publ. 20.11.2000). The device includes a frame (bed) on which clamps for pipes and a drive for moving another pipe are fixed. The moving pipe moving drive is made in the form of two autonomous devices. In each of the latter there are load springs and locking mechanisms of the drives.

The device operates as follows. The pipes to be welded are fixed in the clamps of the device and their ends are heated with a heater, then the heater is removed. After that, the pipe is loaded with the first drive in the direction of the joint through the corresponding spring, for example, at 60% of the pipe movement force, and the device is fixed in the cocked state. Then the second drive through its spring is loaded the pipe to the upsetting force and fix it in this position. After cooling the joint, the device is released and the finished pipe is released from the clamps.

The disadvantages of the prototype are:

- the complex design of the device, due to the presence of two approximately equivalent in functionality drives;

- the complexity (difficulty) of maintaining a technological pause (not more than 3 seconds) from the moment of separation of the pipes from the heater to their connection with the sequential operation of two drives.

The objective of the invention is to increase the range with enhanced functionality of devices for butt welding of plastic pipes, which provide a reduction in the duration of the technological pause from removing the heater to the joint of the pipes with a manual screw drive of the movable carriage.

The technical result of the invention is:

- expanding the functionality of the device;

- ensuring optimal technological parameters of welding, namely, the efforts of pressing the pipes and reducing the duration of the technological pause from removing the heater to the joint of the pipes;

- preventing the formation of a film at the joints of pipes at the time of welding;

- obtaining a better and more durable seam;

- prevention of technological difficulties associated with the joining of pipes;

- simplifying the design of the device;

- reducing the weight and cost of the device.

The elimination of these drawbacks and the achievement of the claimed technical result from the implementation of a device for welding plastic pipes, including a frame, pipe moving drives, pipe clamps, a load spring, is achieved due to the fact that the device includes a fixed carriage fixed to the frame; a movable carriage comprising two autonomous actuators made manually; pipe clamps attached to each carriage; moreover, only one drive includes a load spring and is equipped with a screw that provides compression of the load spring; the other drive includes only a lever and provides idle movement of the movable carriage, while the device comprises a bracket radially welded to the screw drive nut on which the pivot axis of the lever is fixed, and a second bracket that is radially welded to the screw drive nut on the opposite side of the first bracket, which has two radial grooves to enable the lever to be fixed in two positions, a spindle screw on which the sleeve is freely mounted, moved by the lever through the stops and providing I am able to move the carriage through the load spring. In this case, the sleeve stroke under the action of the lever is structurally chosen to be somewhat larger (for example, by 10%) of the distance between the ends of the pipes after removing the heater.

A comparative analysis of the known and claimed invention shows that the following design features are common features of the prototype and the proposed device, namely, the compared devices include a frame (bed), pipe movement drives, pipe clamps, and a load spring.

A distinctive feature of the claimed invention is that the device includes a fixed carriage mounted on a frame; a movable carriage comprising two autonomous actuators made manually; pipe clamps attached to each carriage; moreover, only one drive includes a load spring and is equipped with a screw that provides compression of the load spring; the other drive includes only a lever and provides idle movement of the movable carriage, while the device comprises a bracket radially welded to the screw drive nut on which the pivot axis of the lever is fixed, and a second bracket that is radially welded to the screw drive nut on the opposite side of the first bracket, which has two radial grooves to enable the lever to be fixed in two positions, a spindle screw on which the sleeve is freely mounted, moved by the lever through the stops and providing I am able to move the carriage through the load spring. In this case, the stroke of the sleeve under the action of the lever is structurally chosen to be somewhat larger (for example, by 10%) of the distance between the ends of the pipes after removing the heater.

The invention is illustrated by the following drawings, which depict the inventive device for welding plastic pipes. Figure 1 presents a General view; figure 2 is a view of figure 1; figure 3 is a view of B in figure 2.

The proposed device for welding plastic pipes consists of a movable 1 and fixed on a fixed frame 2 carriages with clamping half rings 3 with interchangeable inserts for pipes. Interchangeable units 4 are alternately installed between the carriages, first a trimmer with a drive, then a heater with a temperature regulator. The movable carriage 1 is mounted on two guides 5, which are rigidly fixed in the fixed carriage 2. The spindle 6 is rotated by the handle 7 through the chain gear 8. Two brackets are rigidly fixed to the nut 9 of the screw gear. In the lower (in FIG. 3) bracket 10, consisting of one plate, the axis of rotation of the lever 11 is fixed. The upper bracket 12 consists of two parallel plates, each of which has two radial grooves with the possibility of alternately entering the latch 13. The latch 13 is installed in the groove of the lever 11 and can move along its axis. The lower (in FIG. 3) part of the lever 11 consists of two parallel plates that enclose the sleeve 14 and are in contact with four stops 15 welded to the sleeve 14. The upper part of the lever 11 (in FIG. 3) is made in the form of a pipe in which (mounted) button 16, rigidly connected to the pusher 17, the button 16 and the pusher 17 are spring-loaded with a spring 18. At the second end of the sleeve 14, a ring 19 is rigidly fixed, located inside the movable carriage 1 between one of its cheeks and the load spring 20. The second end of the spring 20 abuts against the second cheek of the carriage 1.

The proposed device for welding plastic pipes works as follows. Previously, the lever 11 is installed in the left (in Fig.3) position, and a trimmer is installed on the guides 5. The pipes to be welded are fixed in the clamping half rings 3. The screw 6 is rotated by the handle 7, while the nut 9 starts to move to the right (in Fig. 1) and through the bracket 12, the clamp 13, the stops 15, the sleeve 14, the ring 19 and the spring 20 moves the carriage 1 with a pipe to the miter. Next, the end of the movable pipe pushes the miter along the guides 5 to the end of the stationary pipe. When the miter cutter stops at the end of the stationary pipe and the handle 7 continues to rotate, compression of the load spring 20 begins to the force required for milling the pipes. The pressing force is controlled on a scale fixed on the cheeks of the carriage 1, with a pointer fixed to the ring 19 (not shown). Then, the milling ends of both pipes are milled by the miter drive, then by pressing the button 16, the latch 13 is removed from pinching with the bracket 12 and the lever 11 is moved to the left (in Fig. 1) position, moving the pipe end from the miter, then the miter is removed from the installation. A heater is installed on the vacant space between the ends of the pipes. The ends of the pipes, as in the previous operation, are pressed against the heater with the required effort by turning the knob 7. After a certain exposure time sufficient to melt the ends of the pipes to the required depth, the pipes are torn off the heater using a screw drive, and the heater is removed from the installation. Then, the lever 11 is quickly transferred to the right (in Fig. 1) position, while the movable carriage 1 with the pipe quickly moves to the fixed pipe and the heated ends of the pipes are joined. The stroke of the sleeve 14 under the action of the lever 11 is structurally selected somewhat larger (for example, by 10%) the distance between the ends of the pipes after removing the heater. After joining the pipes with a lever drive with a screw drive, the load spring 20 is compressed to an upsetting force, and after the seam has cooled, the welding of the pipes ends.

Thus, the proposed device with the simplicity of design, low weight and low cost, ensures the implementation of the required technological parameters of welding, especially the pressure of the pipes and the time of the technological pause.

Claims (2)

1. A device for welding plastic pipes, including a frame, pipe moving drives, pipe clamps, a load spring, characterized in that it includes a fixed carriage fixed to the frame, a movable carriage containing two autonomous actuators made by hand, clamps for pipes are mounted on each carriage moreover, only one drive includes a load spring and is equipped with a screw that provides compression of the load spring, the other drive includes only a lever and provides idle movement of the movable carriage, while the construction comprises a bracket radially welded to the screw drive nut on which the axis of rotation of the lever is fixed, as well as a second bracket radially welded to the screw drive nut on the opposite side of the first bracket, which has two radial grooves to enable the lever to be fixed in two positions, the lead screw , on which the sleeve is freely dressed, moved by the lever through the stops and providing the possibility of moving the carriage through the load spring. 2. The device according to claim 1, characterized in that the sleeve stroke under the action of the lever is structurally chosen to slightly larger (about 10%) the distance between the ends of the pipes obtained after removing the heater.

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