Pressure testing machine

Abstract

The invention discloses a pressure testing machine, and relates to the technical field of pipe pressure testing, a semicircular pipe is arranged on a table top of a pressure testing rack, the outer pipe wall of the semicircular pipe faces upwards, two straight edges of the semicircular pipe are in sealed connection with the table top, and the outer peripheral surface of the semicircular pipe has a curvature which is in sealed fit with arc-shaped sealing strips at two end parts of a half Hough joint body to be subjected to pressure testing; the table board close to the exteriors of the two straight edges of the semicircular pipe is a supporting plane which is in sealing fit with the straight sealing strips on the two straight edge sides of the Hough joint half body to be subjected to pressure test, a strip pressing plate which moves up and down is arranged above the supporting plane, and an orifice penetrating through the pipe wall of the semicircular pipe is connected with a pressure water source on the pipe cavity side; and the half joint can be conveniently subjected to a pressure resistance test.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe fitting pressure testing, and specifically to a pressure testing machine. Background Art

[0002] A split coupling is a key device for repairing or connecting pipe branches, and is widely used in fields such as municipal water supply, petrochemical industry, and gas transmission. It wraps the pipe interface through a split structure and uses bolts and sealing rubber rings to achieve rapid repair, with advantages such as no need to cut off water supply, no need for welding, and convenient construction. In order to avoid pipe bursting caused by the low structural strength of the split coupling and to prevent safety accidents or economic losses, the split coupling needs to undergo strict pressure testing.

[0003] In the existing pressure testing equipment, generally only various pipe fittings are targeted. For example, the technical solution disclosed in the document with the title "Engineering Water Supply and Drainage Pipe Fitting Pressure Testing Machine" (document number CN217211396U) first fixes both ends of the pipe body through the semi-circular pipes in the fixing parts, and then conducts a pressure resistance test on the pipe; due to the characteristics of the shape of the split coupling itself, the fixing parts in the above document cannot fix the semi-body of the split coupling, and at the same time, it is also impossible to conduct a pressure resistance test on the semi-body of the split coupling.

[0004] The document with the title "An Underground Pipeline Pressure Testing and Detection Device" (document number CN220568331U) also discloses a technical solution for pipeline pressure testing. A base device is arranged at the bottom of the device shell, and a splash-proof device is arranged at the bottom end of the perfusion pipe. The waterproof rubber membrane expands outward under the extrusion of gas and presses against the gap between the bottom of the underground pipeline and the contact surface, effectively improving the airtightness of the device. And the outer ring sleeve moves downward and is sleeved on the outer diameter of the underground pipeline to prevent water splashes from splashing out of the underground pipeline during water injection; however, the solution described in this document can still only be applied to the pressure testing of a tubular specimen as a whole, and it is impossible to conduct a pressure resistance test on the semi-body of the split coupling. Summary of the Invention

[0005] The purpose of the present invention is to provide a pressure testing machine that is convenient for conducting a pressure resistance test on a split coupling.

[0006] The present invention can be realized through the following technical solutions: A pressure testing machine, on the table surface of the pressure testing bench frame, there is a semi-circular pipe, the outer pipe wall of the semi-circular pipe faces upward and the two straight edges are sealingly connected to the table surface. The outer peripheral surface of the semi-circular pipe has a curvature that is sealingly fitted with the arc-shaped sealing strips at both ends of the semi-body of the split coupling to be pressure tested. The table surface near the two straight edges of the semi-circular pipe is a supporting plane that is sealingly fitted with the straight sealing strips on both straight edge sides of the semi-body of the split coupling to be pressure tested. Above the supporting plane, there is a pressure strip plate that moves up and down. The area between the supporting plane and the pressure strip plate forms a constraint area for pressing and fixing the connecting flange edges on both straight edge sides of the semi-body of the split coupling to be pressure tested. The orifice of the through pipe wall of the semi-circular pipe is used to connect to a pressure water source on the pipe cavity side.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] By applying a downward pressure on the connecting flange edge through the strapping plate, a sealed cavity is formed between the semi-circular pipe, the supporting plane and the half body of the huff joint to be pressure-tested. By injecting a certain volume and pressure of liquid into this sealed cavity through the orifice with a pressure water source, the pressure resistance performance test of the half body of the huff joint to be pressure-tested is finally realized, which has the advantages of simple operation steps, stable test process and accurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 、 2 Figure 3 is a schematic structural diagram of a huff joint in the prior art;

[0010] Figure 4 、 5 Figure is a schematic structural diagram of the whole of the present invention;

[0011] Figure 6 、 7 Figure is a schematic structural diagram above the tabletop of the pressure test bench in the present invention;

[0012] Figure 8 、 9 Figure is a schematic structural diagram below the tabletop of the pressure test bench in the present invention;

[0013] Figure 10 is Figure 9 a sectional view taken along line C-C in;

[0014] Figure 11 is Figure 9 a sectional view taken along line D-D in;

[0015] Figure 12 is Figure 9 a sectional view taken along line E-E in;

[0016] Figure 13 is Figure 8 a partially enlarged view at B in;

[0017] Figure 14 Figure is a schematic structural diagram of the bottom of the semi-circular pipe in the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0018] To better illustrate the present invention, a brief description of the basic composition of the huff joint is given first: Refer to Figures 1-3As shown in the figure, the clamp coupling is composed of two half clamp couplings A. Grooves are provided at both ends A1 of the half clamp coupling A to accommodate the arc-shaped sealing strip A11. Grooves are also provided on both straight sides of the half clamp coupling A to accommodate the straight sealing strip A21. Connecting flange edges A4 are provided on both straight sides of the half clamp coupling A. The two half clamp couplings A are bolted together at the flange edges A4 to form a whole. A communicating pipe can also be provided in the middle of the half clamp coupling A and a flange A3 can be provided at the pipe orifice end of the communicating pipe, so as to form a multi-way clamp coupling.

[0019] Please refer to Figures 1-14 As shown in the figure, a testing press is provided. A semi-circular pipe 20 is provided on the tabletop 11 of the test bench frame 10. The outer pipe wall of the semi-circular pipe 20 faces upward and its two straight sides are sealingly connected to the tabletop 11. The outer peripheral surface of the semi-circular pipe 20 has a curvature that is sealingly fitted with the arc-shaped sealing strip A11 at both ends A1 of the half clamp coupling A to be tested. The tabletop 11 near the two straight sides of the semi-circular pipe 20 is a supporting plane 111 that is sealingly fitted with the straight sealing strip A21 on both straight sides of the half clamp coupling A to be tested. A pressing strip plate 40 that moves up and down is provided above the supporting plane 111. The area between the supporting plane 111 and the pressing strip plate 40 forms a constraint area for pressing and fixing the connecting flange edges A4 on both straight sides of the half clamp coupling A to be tested. The orifice 22 of the through pipe wall of the semi-circular pipe 20 is used to connect to a pressure water source on the pipe cavity side.

[0020] The semi-circular pipe 20 is detachably connected to the tabletop 11. The two straight sides of the semi-circular pipe 20 are in close contact with the tabletop 11, playing a role in supporting the half clamp coupling A to be tested. When the half clamp coupling A to be tested is pressed against the outer pipe wall of the semi-circular pipe 20, the two arc-shaped sealing strips A11 seal the gap between the half clamp coupling A to be tested and the semi-circular pipe 20. The two straight sealing strips A21 seal the gap between the half clamp coupling A to be tested and the supporting plane 111. When the pressing strip plate 40 applies a downward pressure to the connecting flange edge A4, the straight sealing strip A21 is closely attached to the supporting plane 111, and at the same time, the arc-shaped sealing strip A111 is pressed against the outer pipe wall of the semi-circular pipe 20. Furthermore, a sealed cavity is formed between the semi-circular pipe 20, the supporting plane 111 and the half clamp coupling A to be tested. A certain volume and pressure of liquid are injected into the sealed cavity through the orifice 22 by the pressure water source, and then after maintaining the pressure for a period of time, the integrity and pressure resistance performance of the half clamp coupling A of the half clamp coupling A to be tested are tested.

[0021] Further, in order to adapt to the pressure test of the three-way or four-way half coupling, a sealing plate 30 that moves vertically and horizontally is provided above the tabletop 11 of the pressure test bench 10. The vertical displacement driving mechanism drives the sealing plate 30 to approach or move away from the connecting pipe flange A3 in the middle of the half coupling A to be pressure tested. An annular sealing ring 31 is provided on the side of the plate surface of the sealing plate 30 that fits with the connecting pipe flange A3 in the middle of the half coupling A to be pressure tested. When a connecting pipe flange A3 is provided in the middle of the half coupling A to be pressure tested, the connecting pipe flange A3 also needs to be sealed. Specifically, the vertical displacement driving mechanism drives the sealing plate 30 to move downward until it presses against the connecting pipe flange A3, and then the annular sealing ring 31 is used to seal the gap between the connecting pipe flange A3 and the sealing plate 30.

[0022] Two pressing strip plates 40 are symmetrically arranged on the outer sides of the two straight edges of the semi-circular pipe 20. The plate surfaces of the two pressing strip plates 40 are located in the plumb plane and their lower plate edges are parallel to the supporting plane 111. The pressing strip plates 40 are connected to the lateral displacement driving mechanism and the lateral displacement driving mechanism drives the pressing strip plates 40 to move in a manner that the plate surfaces approach or move away from each other; the lower plate edges of the pressing strip plates 40 are parallel to the supporting plane 111, so that the pressing strip plates 40 can uniformly apply pressure to the connecting flange edge A4, ensuring the stability of the half coupling A to be pressure tested during the pressure test; the lateral displacement driving mechanism drives the two pressing strip plates 40 to move away from each other, so that there is enough distance between the two pressing strip plates 40, which is convenient for placing the half coupling A to be pressure tested on the semi-circular pipe 20 with the outer pipe wall facing up or removing the half coupling A to be pressure tested from the semi-circular pipe 20. In addition, different sizes of semi-circular pipes 20 can be replaced to adapt to the half coupling A with unqualified test specifications.

[0023] A guiding hole 12 that penetrates vertically is provided on the tabletop 11 of the pressure test bench 10. The guiding hole 12 is a strip-shaped hole and the major axis direction thereof is perpendicular to the straight edge of the semi-circular pipe 20. A vertical piston rod 51 of a vertically arranged hydraulic cylinder 50 is vertically inserted into the guiding hole 12. The rod end of the vertical piston rod 51 is connected to the pressing strip plate 40 through a connecting block 52. When the vertical piston rod 51 moves up and down, it drives the pressing strip plate 40 to move up and down. The lateral displacement driving mechanism located below the tabletop 11 is connected to the vertically arranged hydraulic cylinder 50 and drives the vertically arranged hydraulic cylinder 50 to move horizontally, driving the pressing strip plate 40 to move in a manner that the plate surfaces approach or move away from each other; when the piston rod 51 moves along the major axis direction of the guiding hole 12, it drives the two pressing strip plates 40 to approach or move away from each other; the vertically arranged hydraulic cylinder 50 drives the piston rod 51 downward so that the pressing strip plate 40 presses against the connecting flange edge A4.

[0024] Below the tabletop 11, two guide rails 54 are provided at the position of each guide hole 12. The two guide rails 54 are symmetrically distributed outside the two major axis sides of the guide hole 12, and the length directions of the two guide rails 54 are parallel to the major axis direction of the guide hole 12. The two guide rails 54 form a clamping groove 541 with the notch facing each other. There is a circumferentially arranged annular convex ring 55 on the cylinder wall of the vertically arranged hydraulic cylinder 50. The annular convex ring 55 is embedded in the clamping groove 541 and a sliding fit is formed between the two; the two guide rails 54 jointly form the guidance for the lateral displacement of a vertically arranged hydraulic cylinder 50. The annular convex ring 55 at the top of the vertically arranged hydraulic cylinder 50 is just clamped in the clamping groove 541. On the one hand, the clamping groove 541 forms the guidance for the linear displacement of the vertically arranged hydraulic cylinder 50, and on the other hand, it also limits the position of the vertically arranged hydraulic cylinder 50 in the plumb direction, that is, the cylinder body of the vertically arranged hydraulic cylinder 50 will not generate displacement in the plumb direction, thereby ensuring the stability of the vertically arranged hydraulic cylinder 50 during operation; the annular convex ring 55 can utilize the cylinder head end cover of the hydraulic cylinder 50 itself or can be separately provided on the peripheral wall of the cylinder body.

[0025] On the tabletop 11 on each side where the pressing strip plate 40 is located, two guide holes 12 are respectively provided, and the two vertically arranged hydraulic cylinders 50 below the two guide holes 12 are connected to the connecting rod 53. The lateral displacement driving mechanism includes two groups of horizontally arranged hydraulic cylinders 70 installed below the tabletop 11. The piston rod ends of each group of horizontally arranged hydraulic cylinders 70 are respectively connected to the corresponding connecting rod 53. The two groups of horizontally arranged hydraulic cylinders 70 drive the corresponding connecting rods 53 to make displacements with the rod surface approaching or moving away; in this embodiment, each group of horizontally arranged hydraulic cylinders 70 respectively includes two hydraulic cylinders, and the piston rod extending directions of these two hydraulic cylinders are the same. By setting multiple hydraulic cylinders, it is ensured that a sufficiently large and symmetrical force is applied to the connecting rod 53 to enable the vertically arranged piston cylinder 50 to generate stable displacement.

[0026] Connecting holes 41 are formed on the plate surface of the pressing strip plate 40. The connecting block 52 is inserted through the connecting holes 41 and the bottom surface of the connecting block 52 is pressed against the bottom of the connecting holes 41. The connecting block 52 and the pressing strip plate 40 are fixed by bolts radially arranged in the connecting holes 41; the connection between the pressing strip plate 40 and the connecting block 52 is a detachable connection, which is convenient for replacing pressing strip plates 40 of different specifications.

[0027] An exhaust hole 21 penetrating the pipe wall is further provided on the semi-circular pipe 20. One end of the exhaust hole 21 located inside the pipe cavity is connected to an exhaust pipe 23, and a solenoid valve is provided at the other end of the exhaust pipe 23; a water injection pipe 24 is connected to the side of the orifice 22 inside the cavity of the semi-circular pipe 20, and the other end of the water injection pipe 24 is connected to a pressure water source; by providing the exhaust hole 21 on the semi-circular pipe 20, the gas is discharged before the liquid fills the sealed cavity, so as to avoid the influence of the gas on the test of the maximum liquid pressure that the test pressure-resistant half-coupling A can withstand; specifically, the pressure water source injects water into the sealed cavity through the water injection pipe 24, and at the same time, the residual air in the sealed cavity is discharged through the exhaust hole 21 and the exhaust pipe 23. Since a solenoid valve is connected to the exhaust pipe 23, when water flows out of the exhaust pipe 23, it means that all the air in the sealed cavity has been discharged. At this time, the solenoid valve is closed, and then the press connected to the pressure water source starts to increase the pressure. After reaching the required pressure, it is kept stable for a period of time, and then the solenoid valve is opened to relieve the pressure, thus completing the pressure test of the half-coupling A.

[0028] A support frame 60 is provided at the top of the pressure test bench 10. The vertical displacement driving mechanism includes a third hydraulic cylinder 61 provided at the top of the support frame 60 and arranged vertically. The sealing plate 30 is connected to the end of the piston rod of the third hydraulic cylinder 61; the third hydraulic cylinder 61 drives the sealing plate 30 to displace downward and realizes the pressing against the connecting pipe flange A3, thereby realizing the sealing of the connecting pipe in the middle of the half-coupling A. This solution is applicable to the pressure resistance test of a three-way half-coupling or a four-way half-coupling.

Claims

1. A pressure testing machine, characterized in that: A semicircular tube (20) is arranged on the table (11) of the pressure test stand (10), the outer tube wall of the semicircular tube (20) faces upward and the two straight sides are sealedly connected to the table (11), the outer peripheral surface of the semicircular tube (20) is a curvature that forms a sealing fit with the arc-shaped sealing strips (A11) at the two ends (A1) of the half section half body (A) to be pressure tested, and the table (11) adjacent to the outside of the two straight sides of the semicircular tube (20) is a curvature that forms a sealing fit with the two ends (A1) of the half section half body (A) to be pressure tested. The straight sealing strip (A21) on the straight side forms a sealed supporting plane (111), a stripping plate (40) that moves up and down is arranged above the supporting plane (111), and the area between the supporting plane (111) and the stripping plate (40) forms a restraining area for pressing and fixing the flange edges (A4) connecting the two straight sides of the half-body (A) to be pressure tested, and the orifice (22) penetrating the tube wall of the semicircular tube (20) is used to connect to a pressure water source on the tube cavity side.

2. The pressure testing machine according to claim 1, characterized in that: A sealing plate (30) which is displaceable up and down and in a horizontal state is also arranged above the table surface (11) of the pressure test stand (10); a vertical displacement driving mechanism drives the sealing plate (30) to approach or move away from a flange plate (A3) of a connecting pipe in the middle of the half section (A) to be pressure tested; and an annular sealing ring (31) is arranged on the plate surface side where the sealing plate (30) is in contact with the flange plate (A3) of the connecting pipe in the middle of the half section (A) to be pressure tested.

3. The pressure testing machine according to claim 1 or 2, characterized in that: The two pressure strip plates (40) are symmetrically arranged outside the two straight edges of the semicircular tube (20), the plate surfaces of the two pressure strip plates (40) are located on the plumb plane and the lower plate edges thereof are parallel to the supporting plane (111), the pressure strip plates (40) are connected to the lateral displacement driving mechanism and the lateral displacement driving mechanism drives the pressure strip plates (40) to move the plate surfaces closer or farther.

4. The pressure testing machine according to claim 3, characterized in that: A guide hole (12) is provided on the table (11) of the pressure test stand (10) and is passed through in the up-down direction. The guide hole (12) is a strip-shaped hole and its long diameter direction is perpendicular to the straight side of the semicircular tube (20). A vertical piston rod (51) of a vertical hydraulic cylinder (50) is vertically inserted in the guide hole (12). The rod end of the vertical piston rod (51) is connected to the pressure strip plate (40) through a connecting block (52). When the vertical piston rod (51) is raised or lowered, the pressure strip plate (40) is driven to move up and down. A lateral displacement driving mechanism located below the table (11) is connected to the vertical hydraulic cylinder (50) and drives the vertical hydraulic cylinder (50) to move laterally, thereby driving the pressure strip plate (40) to move closer to or farther from the plate surface.

5. The pressure testing machine according to claim 4, characterized in that: Two guide rails (54) are arranged below the table (11) at the position of each guide hole (12). The two guide rails (54) are symmetrically distributed outside the two long diameter sides of the guide hole (12), and the length directions of the two guide rails (54) are parallel to the long diameter direction of the guide hole (12). The two guide rails (54) form a clamping groove (541) with notches arranged opposite to each other. A circumferentially arranged annular convex ring (55) is provided on the cylinder wall of the vertical hydraulic cylinder (50), and the annular convex ring (55) is embedded in the clamping groove (541) and a sliding fit is formed between the two.

6. The pressure testing machine according to claim 5, characterized in that: Two guide holes (12) are respectively arranged on the table surface (11) on the side where each pressure strip plate (40) is located, and two vertical hydraulic cylinders (50) below the two guide holes (12) are connected to the connecting rod (53). The lateral displacement driving mechanism includes two groups of horizontal hydraulic cylinders (70) installed below the table surface (11), and the piston rod ends of each group of horizontal hydraulic cylinders (70) are respectively connected to the corresponding connecting rod (53). The two groups of horizontal hydraulic cylinders (70) respectively drive the corresponding connecting rod (53) to move toward or away from the rod surface.

7. The pressure testing machine according to claim 4, characterized in that: A connecting hole (41) is provided on the plate surface of the pressure strip plate (40), a connecting block (52) is inserted into the connecting hole (41) and the bottom surface of the connecting block (52) is pressed against the bottom of the connecting hole (41), and the connecting block (52) and the pressure strip plate (40) are fixed by bolts arranged radially in the connecting hole (41).

8. The pressure testing machine according to claim 1 or 2, characterized in that: The semicircular tube (20) is also provided with an exhaust hole (21) penetrating the tube wall; one end of the exhaust hole (21) located in the tube cavity is connected to an exhaust pipe (23); the other end of the exhaust pipe (23) is provided with a solenoid valve.

9. The pressure testing machine according to claim 8, characterized in that: A water injection pipe (24) is connected to the side of the orifice (22) in the lumen of the semicircular tube (20), and the other end of the water injection pipe (24) is connected to a pressure water source.

10. The pressure testing machine according to claim 2, characterized in that: A support frame (60) is arranged on the top of the pressure test stand (10); the vertical displacement drive mechanism comprises a third hydraulic cylinder (61) arranged on the top of the support frame (60) and in a vertical state; and the sealing plate (30) is connected to the end of the piston rod of the third hydraulic cylinder (61).

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