CN112067429A - Active telescopic exhaust pipe of steel pipe hydrostatic testing machine - Google Patents

Abstract

The invention relates to an active telescopic exhaust pipe of a steel pipe hydraulic testing machine. The exhaust pipe is installed at the exhaust end of the hydraulic testing machine, and is driven up and down by hydraulic pressure. The central axis in the telescopic sleeve can guide the air. By supplying pressure in the sleeve with the inner ring cavity, the telescopic sleeve can be extended in multiple sections to achieve elevated exhaust, and the hydraulic active telescopic air guide can overcome the problem of The disadvantages of floating and lifting are difficult to control. The air guide tube is not affected by the water level, the hydraulic lifting balance is good, and the air guide pipe is not affected by the floating. Good, high efficiency, small size advantages.

Description

An active telescopic exhaust pipe of a steel pipe hydraulic testing machine

technical field

The invention relates to a steel pipe hydraulic testing machine, in particular to an active telescopic exhaust pipe of the steel pipe hydraulic testing machine.

Background technique

The hydraulic testing machine is a device used for pressure testing of steel pipes, spiral welded pipes, cast pipes, etc. The purpose is to test the quality of steel pipes, so as to determine whether the steel pipes meet relevant standards and meet user needs. Various types of steel pipe manufacturers.

When testing the steel pipe, the hydraulic testing machine requires both ends to be closed, and low-pressure water is filled into the steel pipe through the water filling valve, and then the high-pressure test is carried out. In this process, since there is air in the pipe, an exhaust channel is required to discharge the air in the pipe. Since the specific gravity of air is smaller than that of water, the air is gathered inside the steel pipe, and with the filling of water, the gas is gathered inside the steel pipe. At this time, an exhaust pipe is required to guide the air out from the top. Depending on the diameter of the tested steel pipe, the required length of the exhaust pipe is also different, and the length of the exhaust pipe needs to be replaced during the process of changing the steel pipe specification. However, in the process of the automatic hydraulic press test, the exhaust pipe cannot be manually replaced or adjusted, which will greatly reduce the test efficiency. In the patent ZL2019 2 2067540.2, the floating ball structure is adopted, and the length of the exhaust pipe can be adjusted by automatic expansion and contraction according to the water level. In this scheme, due to space constraints, the size of the buoyancy cannot be increased indefinitely, so the stroke of the telescopic sleeve is limited to a certain extent. limits. Can not meet the use of more specifications.

SUMMARY OF THE INVENTION

In order to solve the problem of controllability of the exhaust pipe of the steel pipe hydraulic test machine, the invention invents an active expansion and contraction exhaust pipe of the steel pipe hydraulic test machine.

The present invention adopts following technical scheme:

An active telescopic exhaust pipe of a steel pipe hydraulic testing machine, comprising a left frame and a right frame which are horizontally connected to each other, a water filling valve and an exhaust valve are arranged outside the left frame body, an end seat is arranged inside the left frame body, and the end seat is arranged Multi-section telescopic telescopic sleeve, the multi-section telescopic telescopic sleeve is driven and stretched by hydraulic pressure, the telescopic sleeve includes a primary cylinder, an intermediate-stage sleeve, and a final-stage sleeve. The primary cylinder sleeve has the smallest diameter and is set to connect The feet are fixed on the orifice on the end seat, and the intermediate-stage sleeve includes an intermediate-stage outer cylinder and an intermediate-stage inner cylinder. The inner ring wall of the intermediate stage outer cylinder and the outer ring wall of the intermediate stage inner cylinder at the entrance are respectively provided with a limit table and a sealing groove. The outer cylinder of the final stage and the inner cylinder of the final stage are coaxially sleeved together. The outer cylinder of the final stage and the inner cylinder of the final stage are sleeved together to form a final-stage ring-cylinder cavity with a closed upper end. The lower-end opening of the final-stage ring-cylinder cavity is adapted to accommodate the intermediate-stage sleeve body Enter, the inner ring wall of the outer cylinder of the final stage and the outer ring wall of the inner cylinder of the final stage at the entrance of the final stage ring cylinder cavity are respectively provided with a limit table and a sealing groove, each sealing groove is respectively provided with a seal, and the primary cylinder is provided with The wall channel for external pressure input, the upper end of the wall channel is connected to the intermediate ring cylinder cavity, the upper end of the intermediate stage sleeve is provided with an oil channel connecting the final stage ring cylinder cavity and the intermediate ring cylinder cavity, and the upper end of the final stage inner cylinder is provided with an air guide through hole to the inner ring .

The primary cylinder that enters the intermediate ring cylinder cavity is provided with a boss. When the primary cylinder extends axially from the intermediate ring cylinder cavity, it is adapted to the limit table set at the entrance of the intermediate ring cylinder cavity, and enters the final ring cylinder cavity. The middle-stage sleeve is provided with a boss, and when the middle-stage sleeve is extended in the axial displacement of the final-stage ring-cylinder cavity, it is adapted to limit the position with the limit platform set at the entrance of the final-stage ring-cylinder cavity.

The lower end of the wall channel is connected to a hose, and the end seat is provided with a pressure input port to connect the hose.

A pull-rope sensor is also arranged at the connection foot of the primary cylinder, and the pull-rope end of the pull-rope sensor is fixed to the outer body of the final-stage sleeve.

The intermediate stage sleeve is an intermediate stage cylinder or an intermediate stage cylinder of multi-stage ring sleeves.

The outer cylinder of the intermediate stage and the inner cylinder of the intermediate stage are assembled by screws; the outer cylinder of the final stage and the inner cylinder of the final stage are assembled by screws, and the grooves and seals are arranged at the joints of the sleeves.

The sealing grooves respectively set on the inner ring wall of the intermediate stage outer cylinder and the outer ring wall body of the intermediate stage inner cylinder are the adjacent upper and lower sealing grooves, and the lip is set inward near the upper sealing groove in the intermediate ring cylinder cavity. The first outer ring is forward sealed, the first inner ring is forward sealed, the lower sealing groove is provided with the first outer ring reverse seal and the first inner ring reverse seal with the lip outward; the inner ring wall of the last stage outer cylinder The sealing grooves respectively set on the outer ring wall of the inner cylinder of the final stage and the outer ring body of the final stage are two adjacent sealing grooves. The forward seal and the second inner ring are positively sealed, and the lower sealing groove is provided with the lip outwards for the second outer ring for reverse sealing and the second inner ring for reverse sealing.

The upper end of the inner cylinder of the final stage is also vulcanized with a rubber jacking pipe, the rubber jacking pipe and the air guiding through hole are coaxially closed and communicated, and the top end of the rubber jacking pipe is an arc shape with a gap.

Compared with the prior art, the present invention can obtain the following technical effects: the hydraulically controlled active telescopic air guide overcomes the disadvantage that floating and lifting are difficult to control, the air guide cylinder is not affected by the water level, the hydraulic lifting balance is good, and the air guide pipe is not affected by floating Its offset can be simply installed and added with a displacement sensor to monitor the lifting.

The invention realizes the active expansion and contraction of the hydraulic press, strong controllability, good safety, high efficiency, improved position sensing capability and small volume.

Description of drawings

Fig. 1 is the device structure installation diagram of the present invention;

2 is a schematic diagram of the retracted state of the telescopic sleeve 3 of the present invention;

3 is a schematic diagram of the raised state of the telescopic sleeve 3 of the present invention;

Fig. 4 is an enlarged view of A-A of Fig. 2 of the present invention.

Among them, 1-left frame, 2-end seat, 3-extension sleeve, 4-tested steel pipe, 5-right frame, 6-primary cylinder, 7-intermediate outer cylinder, 8-intermediate inner cylinder, 9- Last stage outer cylinder, 10-last stage inner cylinder, 11-wall hole, 12-hose, 13-first outer ring reverse seal, 14-first inner ring reverse seal, 15-first inner ring forward Seal, 16- the first outer ring positive seal, 17- intermediate ring cylinder cavity, 18- oil passage, 19- final ring cylinder cavity, 20- screw one, 21-O-ring, 22- screw two, 23- Rope sensor, 24-rope fixing point, 25-exhaust valve, 26-fill valve, 27-rubber top pipe, 28-vent hole, 29-second outer ring reverse seal, 30-second inner ring Reverse seal, 31-forward seal of the second inner ring, 32-forward seal of the second outer ring.

Detailed ways

As shown in Figures 1-4, the technical solution adopted in the present invention is to provide an active telescopic exhaust pipe of a steel pipe hydrostatic testing machine, and the active telescopic exhaust pipe is installed at the exhaust end of the left frame 1 of the hydrostatic testing machine ; Its structure is a telescopic sleeve 3 through which the central axis passes through, which is a segmented structure, and the central axis can guide air. The diameter of one section is larger than that of one section, the diameter of the sleeve of the primary cylinder 6 is the smallest and the connecting feet are set. 7. The intermediate-stage inner cylinder 8 is coaxially sleeved, the upper end of the intermediate-stage outer cylinder 7 is provided with an inner ring platform, the inner ring platform is provided with a positioning stop, and the upper end of the intermediate-level inner cylinder 8 is provided with a positioning platform, which is connected with the intermediate-level outer cylinder 7 The positioning stop is adapted, and a screw 20 is provided at the positioning table to connect and fix the intermediate stage outer cylinder 7 and the intermediate stage inner cylinder 8, thereby forming an intermediate ring cylinder cavity 17 with a closed upper end, and the lower end opening of the intermediate ring cylinder cavity 17 is adapted to accommodate the primary cylinder. 6 body enters, the intermediate stage outer cylinder 7 inner ring wall body and the intermediate stage inner cylinder 8 outer ring wall body at the entrance of the intermediate ring cylinder cavity 17 are respectively provided with a limit table and two adjacent upper and lower sealing grooves, close to the intermediate ring The upper sealing groove in the cylinder cavity 17 is provided with the first outer ring positive seal 16 and the first inner ring positive seal 15 with the lips facing inward, to close the intermediate ring cylinder cavity 17 and prevent its pressure from leaking out, and the lower sealing groove Set the first outer ring reverse seal 13 and the first inner ring reverse seal 14 with the lips outward to prevent external water pressure from leaking into the intermediate ring cylinder cavity 17, and the primary cylinder 6 entering the intermediate ring cylinder cavity 17 is provided with a boss , when the primary cylinder 6 is extended in the axial displacement of the intermediate ring cylinder cavity 17, it is adapted to the limit station set at the entrance to prevent the primary cylinder 6 from slipping from the intermediate ring cylinder cavity 17, and the primary cylinder 6 is in the intermediate ring cylinder cavity. 17 When the axial displacement is retracted, the inner ring platform limit is set on the upper end of the outer cylinder 7 of the intermediate stage.

The last stage sleeve is composed of the last stage outer cylinder 9 and the last stage inner cylinder 10 coaxially sleeved. The upper end of the last stage outer cylinder 9 is provided with an inner ring platform, the inner ring platform is provided with a positioning stopper and a sealing groove, and the upper end of the last stage inner cylinder 10 is provided. The outer ring is provided with a positioning table, which is matched with the positioning stop of the final-stage outer cylinder 9. The positioning table is provided with a screw two 22 to connect and fix the final-stage outer cylinder 9 and the final-stage inner cylinder 10, thereby forming a final-stage ring cylinder cavity with a closed upper end. 19. An O-ring 21 is set in the sealing groove to prevent the pressure of the final-stage ring cylinder cavity 19 from leaking out. The lower end opening of the final-stage ring cylinder cavity 19 is adapted to accommodate the entry of the intermediate-stage sleeve body. The inner ring wall body of the outer cylinder 9 and the outer ring wall body of the final stage inner cylinder 10 are respectively provided with a limit table and two adjacent upper and lower sealing grooves, and the upper sealing groove in the final ring cylinder cavity 19 is close to the upper sealing groove. The inner second outer ring forward seal 32, the second inner ring forward seal 31, close the last stage ring cylinder cavity 19 and prevent its pressure from leaking out, the lower sealing groove is set with the lip outward of the second outer ring reverse direction The seal 29 and the second inner ring reverse seal 30 to prevent external water pressure from leaking into the final-stage ring cylinder cavity 19, and the intermediate-stage sleeve entering the final-stage ring cylinder cavity 19 is provided with a boss, and the intermediate-stage sleeve is in the final-stage ring cylinder cavity 19. When the cylinder cavity 19 is axially displaced and extended, it is adapted to the limit table set at the entrance to prevent the intermediate stage sleeve from slipping off from the final stage ring cylinder cavity 19. When the displacement is retracted, the upper end of the outer cylinder 9 of the final stage is set to the limit of the inner ring platform, the upper end of the inner cylinder 10 of the final stage is provided with an air guide through hole to the inner ring, and the upper end of the inner cylinder 10 of the final stage is also vulcanized and provided with a rubber top tube 27. The top pipe 27 is in closed communication with the gas-guiding through hole coaxially, and the top of the rubber top pipe 27 is arc-shaped with a notch, which is beneficial for the steel pipe 4 to be tested to discharge more gas at the top.

The inner ring platform facing the upper end of the intermediate-stage outer cylinder 7 is provided with an oil passage 18 communicating with the final-stage ring cylinder cavity 19 and the intermediate ring cylinder cavity 17 .

As shown in Figure 3-4, the primary cylinder 6 is provided with a wall channel 11 for external pressure input. The upper end of the wall channel 11 is connected to the intermediate ring cylinder cavity 17, the lower end is connected to the hose 12, and the end seat 2 is provided with a pressure input port and is connected to the hose 12. When the pressure is input, the pressure medium enters the intermediate ring cylinder cavity 17 and the final ring cylinder cavity 19, and the air-conducting telescopic sleeve 3 rises. The beneficial effect of the sleeve installation method of the fine-level sleeve is to increase the upper load weight, which is conducive to the realization of stable and rapid descent and reset.

The telescopic sleeve 3 in the form of a segmented structure is based on the intermediate-level sleeve structure, and a single intermediate-level sleeve can be adapted to be composed of a plurality of intermediate-level sleeves with different specifications and diameters that are nested with each other, so as to meet the guide of different heights. Gas condition requirements.

As shown in Fig. 3-4, a cable sensor 23 is also provided at the connecting foot of the primary cylinder 6, and the cable end is fixed to the cable fixing point 24 outside the final sleeve to realize precise control and measurement of displacement.

The above-mentioned telescopic sleeve 3 for exhaust, its segment structure has shown and described the technical points of the present invention, and those of ordinary skill in the art can understand it without departing from the principle and spirit of the present invention. Various changes, modifications, replacements and modifications can be made to these embodiments. For example, the hierarchical structure in the embodiment is three-level, and an intermediate-level sleeve is further added to become the fourth-level, and so on. By adding a plurality of intermediate-level sleeves The change of the multi-level structure can be realized, and the purpose is to realize the telescopic exhaust through the multi-level structure, and the specific structure will not be repeated here.

The way it works is:

As shown in Figure 1-2, the active telescopic exhaust pipe is installed at the exhaust end of the left frame 1 of the hydraulic testing machine, and the right frame 5 is equipped with a clamping mechanism for the steel pipe 4 to be tested. Fill the tested steel pipe 4 with low-pressure water. During this process, the water filling valve 26 is opened, the low-pressure water is poured into the tested steel pipe 4, the exhaust valve 25 is opened, and the air inside the tested steel pipe 4 flows from the inner passage of the telescopic sleeve 3. It enters into the end seat 2 and is discharged from the exhaust valve 25 through the vent hole 28 .

As shown in Figure 2-4, when the water is injected and exhausted, the telescopic sleeve 3 performs the lifting action, the pressure input port set on the end seat 2 inputs the pressure, and the pressure medium enters the intermediate ring cylinder cavity 17 and the final stage through the hose 12 and the wall hole 11. In the ring cylinder cavity 19, the pressure is established, the telescopic sleeve 3 that can guide the gas rises, and the rubber top pipe 27 is pressed against the top of the inner cavity of the steel pipe 4 to be tested, which is more conducive to the purification of gas. When the pressure input port is released or negative pressure, The telescopic sleeve 3 descends by its own weight; at the same time, when the tested steel pipe 4 is filled with water pressure, the pressurization in the pipe can also promote the descending of the telescopic sleeve 3, thereby quickly releasing the inner pressure of the intermediate ring cylinder cavity 17 and the final ring cylinder cavity 19. The telescopic sleeve 3 allows water to enter. The medium filled in the intermediate ring cylinder cavity 17 and the final stage ring cylinder cavity 19 of the telescopic sleeve 3 can be oil or water, preferably oil, when the medium is oil, the first outer ring reverse seal 13, the first inner ring The ring reverse seal 14 prevents the water pressure or air pressure in the inner cavity of the steel pipe 4 to be tested from entering the intermediate ring cylinder cavity 17, resulting in leakage and pressure loss or pollution; the second outer ring reverse seal 29 and the second inner ring reverse seal 30 prevent The water pressure or air pressure in the inner cavity of the test tube 4 enters the final ring cylinder cavity 19, resulting in leakage and pressure loss or pollution; The oil/water enters the tested steel pipe 4, causing leakage; the second inner ring positive seal 31 and the second outer ring positive seal 32 prevent the oil/water in the final ring cylinder cavity 19 from entering the tested steel pipe 4, resulting in leakage.

While the steel pipe 4 to be tested is being pressed, the telescopic sleeve 3 can expand and contract by supplying high/low pressure.

When the telescopic sleeve 3 rises/descends, the pulling rope end of the pulling rope sensor 23 rises and falls, so as to realize the detection of the raised position of the telescopic sleeve 3 .

Claims (8)

1. The utility model provides a steel pipe hydrostatic testing machine initiative blast pipe that stretches out and draws back, includes left frame (1) and right frame (5) of horizontal interconnect, and left frame (1) external side sets up water filling valve (26) and discharge valve (25), and end seat (2) that left frame (1) internal side set up can the flexible telescope tube of multisection (3), its characterized in that of setting on end seat (2): the multi-section telescopic sleeve (3) is driven to stretch by hydraulic pressure, the telescopic sleeve (3) comprises a primary barrel (6), a middle-stage sleeve and a final-stage sleeve, the primary barrel (6) is smallest in sleeve diameter and is provided with a connecting ground foot to be fixed on an upper orifice of an end seat (2), the middle-stage sleeve comprises a middle-stage outer barrel (7) and a middle-stage inner barrel (8), the middle-stage outer barrel (7) and the middle-stage inner barrel (8) are coaxially sleeved to form a middle ring barrel cavity (17) with a sealed upper end, a limiting table and a sealing groove are respectively arranged on an inner ring wall body of the middle-stage outer barrel (7) and an outer ring wall body of the middle-stage inner barrel (8) at an inlet of the middle ring barrel cavity (17), an opening at the lower end of the middle ring barrel cavity (17) is matched to accommodate the primary barrel to enter, and the final-stage, last stage urceolus (9), last stage inner tube (10) cup joint and constitute upper end confined last stage ring barrel chamber (19), last stage ring barrel chamber (19) lower extreme opening adaptation holds intermediate stage sleeve body and gets into, last stage outer tube (9) inner ring wall body and last stage inner tube (10) outer ring wall body of last stage ring barrel chamber (19) entrance set up spacing platform and sealed slot respectively, each sealed slot sets up sealed respectively, elementary barrel is provided with outer pressure input's wall pore canal (11), wall pore canal (11) upper end intercommunication intermediate stage ring barrel chamber (17), intermediate stage cover upper end is to setting up oil duct (18) of communicating last stage ring barrel chamber (19) and intermediate stage ring barrel chamber (17), last stage inner tube (10) upper end sets up the air guide through-hole to the inner circle.

2. The active telescopic exhaust pipe of the steel pipe hydrostatic testing machine according to claim 1, characterized in that: the primary cylinder (6) entering the intermediate ring cylinder cavity (17) is provided with a boss, the primary cylinder (6) is matched and limited with a limiting table arranged at an inlet of the intermediate ring cylinder cavity (17) when the intermediate ring cylinder cavity (17) axially displaces and extends out, the intermediate-stage sleeve entering the final stage ring cylinder cavity (19) is provided with a boss, and the intermediate-stage sleeve is matched and limited with a limiting table arranged at an inlet of the final stage ring cylinder cavity (19) when the final stage ring cylinder cavity (19) axially displaces and extends out.

3. The active telescopic exhaust pipe of the steel pipe hydrostatic testing machine according to claim 1, characterized in that: the lower end of the wall pore canal (11) is connected with a hose (12), and the end seat (2) is provided with a pressure input port which is connected with the hose (12).

4. The active telescopic exhaust pipe of the steel pipe hydrostatic testing machine according to claim 1, characterized in that: and a pull rope sensor (23) is further arranged at the connecting foot of the primary cylinder (6), and the pull rope end of the pull rope sensor (23) is fixed outside the final-stage sleeve body.

5. The active telescopic exhaust pipe of the steel pipe hydrostatic testing machine according to claim 1, characterized in that: the middle-stage sleeve is a middle-stage sleeve or a middle-stage sleeve of a multi-stage ring sleeve.

6. The active telescopic exhaust pipe of the steel pipe hydrostatic testing machine according to claim 1, characterized in that: the middle-stage outer cylinder (7) and the middle-stage inner cylinder (8) are sleeved and fixed by screws; the final-stage outer cylinder (9) and the final-stage inner cylinder (10) are sleeved and fixed by screws, and grooves and seals are arranged at the sleeved connection positions.

7. The active telescopic exhaust pipe of the steel pipe hydrostatic testing machine according to claim 1, characterized in that: the sealing grooves respectively arranged on the inner ring wall body of the middle-stage outer cylinder (7) and the outer ring wall body of the middle-stage inner cylinder (8) are an upper sealing groove and a lower sealing groove which are adjacent, a first outer ring forward seal (16) and a first inner ring forward seal (15) with inward lips are arranged close to the upper sealing groove in the middle ring cylinder cavity (17), and a first outer ring reverse seal (13) and a first inner ring reverse seal (14) with outward lips are arranged in the lower sealing groove; the sealing grooves respectively formed in the inner ring wall body of the final-stage outer cylinder (9) and the outer ring wall body of the final-stage inner cylinder (10) are two adjacent upper and lower sealing grooves, the upper sealing groove in the final-stage ring cylinder cavity (19) is provided with a lip opening inward second outer ring forward seal (32) and a second inner ring forward seal (31), and the lower sealing groove is provided with a lip opening outward second outer ring reverse seal (29) and a second inner ring reverse seal (30).

8. The active telescopic exhaust pipe of the steel pipe hydrostatic testing machine according to claim 1, characterized in that: the upper end of the last-stage inner cylinder (10) is further vulcanized and provided with a rubber top pipe (27), the rubber top pipe (27) is coaxially and hermetically communicated with the air guide through hole, and the top end of the rubber top pipe (27) is in a circular arc shape with a notch.

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