RU2370742C1 - Hydraulic press to test pipes for tightness - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: proposed hydraulic press comprises foundation consisting of two crosspieces and two columns jointing the said crosspieces. Each of the latter is mounted on bogie running on track to reciprocate along aforesaid columns. Proposed press incorporates mandrel with sealing assembly and orifice to feed fluid into tested pipe, and mandrel with sealing assembly and orifice to discharge air from tested pipe in filling pipes with fluid. Moving crosspiece and press force transfer mechanisms are integrated. For this column ends have threaded part and nuts coupled with crosspiece. Press incorporates two worm gears with drive, coupled with aforesaid nuts via chain transmission. Thrust plain bearing supports each nut.

EFFECT: simplified design and pipe dismantling after tests.

5 dwg

Description

The invention relates to the construction of hydraulic presses that ensure leakproofness testing of pipes, and can be used in mechanical engineering to determine the tightness of large-sized pipes with diameters from 500 to 1420 mm for various purposes.

A hydraulic press for testing large diameter pipes is known, comprising a front and rear fixed beam, interconnected by columns, an intermediate cross member, a front head with a sealing assembly for supplying fluid to the test pipe, a movable cross beam, main and auxiliary cylinders, and a rear head mounted in the movable traverse with a sealing assembly and an air outlet when filling the pipe with test fluid. The intermediate cross member is rigidly connected to the front traverse by means of couplers through spacers made in the form of pipes. The press is equipped with interchangeable inserts for testing pipes of different assortments in length, each of which is made at the ends with cylindrical protrusions with sealing rings that are associated with corresponding cavities made on the front head and the sealing assembly. In addition, the intermediate cross member is equipped with pipe pullers installed on the sides of the intermediate cross member in a horizontal plane with the possibility of removal of pipes of any diameter from the sealing assembly within the range according to the characteristics of the press [1].

The well-known press is equipped with a mechanism for moving the movable beam and the transmission of force, made in the form of hydraulic cylinders. This scheme provides increased reliability and durability of the device due to the lack of abrasive nodes.

However, this device is complex in design, as it contains additional mechanisms for moving and transmitting forces.

Closest to the claimed, adopted as a prototype, is a hydraulic press for testing pipes for leaks, containing a bed made in the form of a traverse, columns connecting these traverses, one of the traverses is mounted on a trolley and is made with the possibility of reciprocating movement along the columns along a sliding landing, a moving beam moving mechanism and a force transmission mechanism made in the form of a screw with a nut, and a gearbox with a drive for moving the nut, a mandrel with a sealing assembly for and a liquid in the test tube, the mandrel with the seal assembly and the bore for venting during the filling of the test tube with liquid. In the known press, two traverses are made stationary, while one of the fixed traverse has a guide. The third traverse is made movable, moving along the columns. The movement mechanism of the movable traverse is made in the form of idling cylinders mounted on a fixed traverse having a guide. The force transmission mechanism is made in the form of an additional power screw with a nut. In addition, the press is equipped with support rollers mounted around the circumference on the end surfaces of the gearbox, with which the nut located in the gearbox housing interacts [2].

The known device is equipped with a mechanism for moving the movable yoke, made in the form of idling cylinders mounted on a fixed yoke with a guide, and a force transmission mechanism containing an additional power screw with a nut and a gearbox with a drive for moving the nut.

The pipe enters the axis of the press and the idle cylinders are clamped between the sealing mandrels. After sealing the ends, the pipe is filled with water. During filling, the nut, driven into rotation in the support rollers by the drive through the gearbox, moves along the axis of the screw along with the gearbox along the guides all the way into the fixed cross member and rigidly locks the pipe on the press. After filling, the test pressure is applied to the pipe. The force exerted during the test is received by the screw and transmitted through the nut to the press frame. After the test is completed, the nut is retracted to its original position. The pipe is removed from the press, and the cycle repeats.

Weighting the nut relative to the thrust screw allows you to reduce the friction forces during rotation of the nut, which are significant when testing large pipes, which reduces wear on the nut and screw during operation, increases their durability and reliability of the entire device.

In this press there is a third intermediate movable traverse. The pressure from the pipe is perceived by this traverse, perceived by the screw, then by the fixed traverse and transmitted to the columns.

In addition, this device has a mechanism for moving the movable beam, made in the form of idling cylinders mounted on a fixed beam with a guide, a force transmission mechanism containing an additional screw with a nut and a gear with a drive for moving the nut.

Thus, this device is quite complex in design.

In addition, the disadvantage of this device is the difficulty of dismantling the pipe. This is due to the need for forced removal of the pipe from the mandrel with a sealing assembly mounted on a fixed crosshead.

The technical problem solved by the invention is to simplify the design of the device, namely, the creation of a hydraulic press for testing pipes for leaks, which combines the functions of movement and functions of the transfer of force and there are no additional mechanisms and assemblies designed for this.

In addition, the technical task of the invention is to simplify the dismantling of the pipe after testing.

To solve the problem in a known hydraulic press for testing pipes for leaks, containing a bed made in the form of a traverse, columns connecting these traverses, one of the traverses is mounted on a trolley and is made with the possibility of reciprocating movement along the columns along a sliding fit, the movement mechanism movable traverse and the force transmission mechanism, made in the form of a screw with a nut, and a gearbox with a drive to move the nut, a mandrel with a sealing assembly for supplying fluid to the test t According to the invention, the press is equipped with a second movable traverse made with the possibility of reciprocating movement along the columns along a sliding fit, a mechanism for moving both movable traverses along the columns and a mechanism for transmitting force the press is combined, for which the ends of the columns are made with a screw part and each end of the columns is equipped with a nut associated with the traverse, while the press is equipped with two gearboxes driven to rotate nuts.

The implementation of the press with a second movable traverse installed with the possibility of reciprocating movement along the columns along a sliding fit, with a combined mechanism for moving both movable traverses along the columns and a force transfer mechanism, for which the ends of the columns are made with a screw part and each end of the columns is equipped with a nut connected with a traverse, and supplying the press with two gearboxes with a drive for rotating nuts allows you to simplify the design of the hydraulic press by combining the movement function and function uu force transmission.

As a result, the press does not have additional mechanisms and components designed for this, namely, there is no additional power screw and idle cylinders.

In addition, this embodiment of the press allows to simplify the dismantling of the pipe, since when traverses are diluted after testing, the need for forced removal of the pipe from the mandrel with the sealing assembly disappears.

The invention is illustrated by drawings, where figure 1 shows a General view of the proposed device, figure 2 shows a top view of the proposed device, figure 3 is a section along aa in figure 2, figure 4 is a section along b-b figure 2, figure 5 is a section along bb in figure 2.

The hydraulic press for testing pipes for leaks contains a frame made in the form of two traverses 1, two columns 2 connecting these traverses 1. Each traverse 1 is mounted on a trolley 3 mounted on a rail 4 and is made with the possibility of reciprocating movement along the columns 2 on a sliding landing. The press is equipped with a mandrel 5 with a sealing assembly 6 and an opening 7 for supplying fluid to the test pipe 8 and a mandrel 9 with a sealing assembly 10 and an opening 11 for discharging air when the pipe 8 is filled with test fluid. The mechanism for moving both movable traverses 1 along the columns 2 and the transmission mechanism of the force in the press are combined, for which the ends of the columns 2 are made with a screw part 12 and each end of the columns is equipped with a nut 13 connected to the traverse 1. The press is equipped with two worm gearboxes 14 with a drive 15, connected to the nuts 13 by a chain gear 16. Each nut 13 is mounted on a thrust bearing 17, which makes the nut relatively weightless against the thrust screw and reduces friction when the nut rotates. In addition, the press contains supports 18 for installing the test pipe 8 and the fixing supports 19 of the columns 2.

The work of the press is as follows.

When the nuts 13 are driven by the drives 15 through the gearboxes 14 and chain transmissions 16, the crossbars 1 mounted on the bogies 3 move along the rail 4. The pipe 8 is clamped by mandrels 5 and 9 with simultaneous centering. After clamping the pipe 8, the pipe 8 is sealed, for which pressure is supplied to the sealing units 6 and 10. After the pipe 8 is sealed, the pipe 8 is filled with water through the opening 7. The air from the pipe 8 is removed through the hole 11. After the end of the air outlet, the air outlet 11 is closed and the pressure necessary for testing is created in the pipe 8. The force exerted during the test is perceived by the mandrels 5 and 9, transmitted to the traverses 1 and through the nuts 13 it closes on the columns 2. The pipe 8 is kept under pressure for the required time.

After the test, both traverses 1 are bred, for which the nuts 13 with the help of the actuators 15 are returned to their original position. The pipe 8 is removed from the press, and the cycle repeats.

Thus, the claimed invention provides a simplification of the design by combining the displacement function and the transmission function of effort and the absence of additional mechanisms and assemblies designed for this. In addition, the invention simplifies pipe dismantling after testing.

Literary sources

1. Hydraulic press for testing large diameter pipes: RF patent No. 2281473. MKI G01N 3/10, G01M 3/08, V30V 1/32. Stated 2004.11.18. Published on 2006.08.10.

2. Hydraulic press for testing pipes for leaks: USSR author's certificate No. 596846. MKI G01M 3/08, V30V 15/06. Declared 1973.12.12. Published 1978.03.05.

Claims (1)

A hydraulic press for testing pipes for leaks, containing a bed made in the form of a traverse, columns connecting these traverses, one of the traverses is mounted on a trolley and is made with the possibility of reciprocating movement along the columns along a sliding fit, a mechanism for moving the movable traverse and a mechanism for transmitting force made in the form of a screw with a nut, and a gearbox with a drive for moving the nut, a mandrel with a sealing assembly for supplying fluid to the test pipe, a mandrel with a sealing assembly and a hole a method for discharging air when the pipe is filled with test fluid, characterized in that the press is equipped with a second movable traverse made with the possibility of reciprocating movement along the columns along a sliding fit, the mechanism for moving both movable travers along the columns and the force transfer mechanism in the press are combined, for which the ends of the columns are made with a screw part and each end of the columns is equipped with a nut associated with the traverse, while the press is equipped with two gearboxes with a drive for rotating nuts.

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