CN110216441B - Natural gas pipe fitting assembly and detection equipment - Google Patents
Natural gas pipe fitting assembly and detection equipment Download PDFInfo
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- CN110216441B CN110216441B CN201910496624.XA CN201910496624A CN110216441B CN 110216441 B CN110216441 B CN 110216441B CN 201910496624 A CN201910496624 A CN 201910496624A CN 110216441 B CN110216441 B CN 110216441B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
- B23P19/022—Extracting or inserting relatively long parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
- B23P19/027—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same using hydraulic or pneumatic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses natural gas pipe fitting assembling and detecting equipment, which relates to the technical field of pipe fitting processing equipment and at least comprises a bottom plate, a positioning base arranged on the bottom plate and a lifting pressure head positioned above the positioning base, wherein the positioning base comprises a pipe fitting positioning seat and a guide upright post, a guide upright post positioning hole is formed in the top of the pipe fitting positioning seat, and the lower end of the guide upright post is clamped in the guide upright post positioning hole. The invention provides an assembling and detecting device which can ensure the coaxiality of a natural gas pipe fitting in butt joint and detect the air tightness of the pipe fitting, aiming at solving the problems that the coaxiality of steel-plastic conversion pipe fittings in the butt joint process is difficult to ensure and the defects exist in the existing air tightness detection.
Description
Technical Field
The invention relates to the technical field of pipe fitting machining equipment, in particular to natural gas pipe fitting assembling and detecting equipment.
Background
The natural gas pipe fitting mainly refers to a steel-plastic conversion pipe fitting which is composed of a steel pipe section and a plastic pipe section and is formed by punching and splicing through punching equipment generally. However, during the insertion process, if the coaxiality between the steel pipe section and the plastic pipe section is greatly deviated, the joint of the steel pipe section and the plastic pipe section is easy to leak. If the steel-plastic conversion pipe fitting is used for a gas pipe network, great potential safety hazards can be caused. Therefore, before leaving the factory, the steel-plastic conversion pipe fitting needs to be subjected to strict air tightness test, and whether leakage exists at the joint between the steel pipe section and the plastic pipe section is mainly detected. The conventional detection method comprises the steps of sealing two ends of a steel-plastic conversion pipe fitting by using a sealing gasket in an extrusion manner, filling high-pressure gas into a cavity of the pipe fitting, putting the whole pipe fitting into water, observing bubbles, and judging whether the pipe fitting leaks. This detection method has the following two disadvantages: firstly, two ends of the steel-plastic conversion pipe fitting are extruded, so that the sealing performance of a butt joint can be influenced, and the detection misjudgment is caused; and secondly, the steel pipe section is immersed in water, so that the steel pipe section is easily rusted and corroded.
Disclosure of Invention
The invention provides an assembling and detecting device which can ensure the coaxiality of a natural gas pipe fitting in butt joint and detect the air tightness of the pipe fitting, aiming at solving the problems that the coaxiality of steel-plastic conversion pipe fittings in the butt joint process is difficult to ensure and the defects exist in the existing air tightness detection.
In order to achieve the purpose, the invention adopts the following technical scheme: the natural gas pipe fitting assembling and detecting equipment at least comprises a bottom plate, a positioning base arranged on the bottom plate and a lifting pressure head positioned above the positioning base, wherein the positioning base comprises a pipe fitting positioning seat and a guide upright post, a guide upright post positioning hole is formed in the top of the pipe fitting positioning seat, and the lower end of the guide upright post is clamped in the guide upright post positioning hole;
the guide upright column is sequentially divided into an upper section column, a middle section column and a lower section column from top to bottom, a sliding shaft is fixed at the bottom of the upper section column, the middle section column and the lower section column are both tubular, the middle section column and the lower section column are both sleeved on the sliding shaft and are both in sliding sealing fit with the sliding shaft, a moving gap is reserved between the upper section column and the middle section column, and a moving gap is reserved between the middle section column and the lower section column; an annular inclined plane is arranged at the outer edge of the upper section column close to the side of the middle section column, an annular inclined plane is also arranged at the outer edge of the middle section column close to the side of the upper section column, the annular inclined planes of the upper section column and the middle section column form an upper sealing ring positioning groove, and an upper sealing ring is arranged in the upper sealing ring positioning groove; an annular inclined plane is arranged at the outer edge of the middle section column close to the lower section column side, an annular inclined plane is also arranged at the outer edge of the lower section column close to the middle section column side, the annular inclined planes of the annular inclined plane and the annular inclined plane form a lower sealing ring positioning groove, and a lower sealing ring is arranged in the lower sealing ring positioning groove;
the lower opening of the inner hole of the lower section column is sealed by a sealing plate, and the inner hole of the lower section column between the lower end of the sliding shaft and the sealing plate forms a pressure maintaining cavity; the middle section column is provided with a test hole penetrating through the inner wall and the outer wall, a test channel is arranged in the sliding shaft, one end of the test channel is communicated with the test hole in the middle section column, and the other end of the test channel is communicated with the pressure maintaining cavity;
a first inflation hole penetrating through the inner wall and the outer wall is transversely formed in the pipe fitting positioning seat, a second inflation hole penetrating through the inner wall and the outer wall is transversely formed in the lower section column, and the first inflation hole and the second inflation hole correspond to each other and are communicated with each other;
an inflation retaining mechanism is arranged in the sliding shaft and at least comprises a communicating piston hole, a communicating piston, a retaining piston hole and a retaining piston, the communicating piston hole and the retaining piston hole are radially arranged in the sliding shaft, the central axes of the communicating piston hole and the retaining piston hole are collinear, the communicating piston is arranged in the communicating piston hole and is in sliding sealing fit with the communicating piston hole, and the retaining piston is arranged in the retaining piston hole and is in sliding sealing fit with the retaining piston hole;
one end of the communicating piston hole is provided with a third inflation hole communicated to the outer wall of the sliding shaft, the other end of the communicating piston hole is communicated with the backstop piston hole, and the third inflation hole can be communicated with a second inflation hole on the lower section column when the sliding shaft moves downwards to the limit position; a push rod is arranged on one side of the communicating piston, which faces the stopping piston, one end of the push rod is fixed with the communicating piston, the other end of the push rod can be in abutting contact with the stopping piston, and a first spring for returning the communicating piston is sleeved on the push rod;
one end of the stopping piston hole, facing the communicating piston hole, is communicated with the test channel, the other end of the stopping piston hole is provided with a sliding rod hole communicated to the outer wall of the sliding shaft, one side of the stopping piston, facing the sliding rod hole, is provided with a stopping bolt, one end of the stopping bolt is fixed with the stopping piston, the other end of the stopping bolt is slidably arranged in the sliding rod hole, the inner wall of the lower section column is provided with a bolt hole capable of being inserted into the stopping bolt, and the stopping bolt is sleeved with a second spring for returning to the stopping piston;
an air inlet channel is arranged in the sliding shaft, one end of the air inlet channel is communicated with the inner wall of the communicating piston hole, and the other end of the air inlet channel is communicated with the pressure maintaining cavity; when the communicating piston is located at the limit position of one end of the communicating piston hole provided with the third inflation hole, the communicating piston cuts off the opening of the air inlet channel located on the inner wall of the communicating piston hole; when the communicating piston moves to the limit position in the direction of the stopping piston, the air inlet channel is communicated with the third air charging hole.
Preferably, the bottom plate is provided with an inflating mechanism, the inflating mechanism at least comprises an inflating cylinder, a pressurizing piston and a pressure maintaining piston, the inflating cylinder is erected on the bottom plate, the pressurizing piston and the pressure maintaining piston are slidably arranged in the inflating cylinder, the pressurizing piston is positioned above the pressure maintaining piston, a piston rod is vertically fixed on the top surface of the pressurizing piston, and the lower side of the pressure maintaining piston is provided with a third spring for returning the pressure maintaining piston; an air pressure balance hole is formed in the side wall of the inflator barrel below the pressure maintaining piston, an air outlet hole is formed in the side wall of the inflator barrel between the pressurizing piston and the pressure maintaining piston, and an outer opening of the air outlet hole is communicated with the first inflation hole through an air pipe.
Preferably, the outer wall of the lower section column is embedded with first sealing rings in the circumferential direction, the first sealing rings are distributed on the upper side and the lower side of the opening on the outer side of the second inflation hole, and the first sealing rings are in sliding sealing fit with the inner wall of the positioning hole of the guide upright column.
Preferably, the outer wall of the sliding shaft is embedded with second sealing rings in the circumferential direction, the second sealing rings are distributed on the upper side and the lower side of the opening on the outer side of the third inflation hole, and the second sealing rings are in sliding sealing fit with the inner wall of the lower section column.
Preferably, the outer wall circumference of sliding shaft inlays and is equipped with the third sealing washer, the third sealing washer distributes and communicates open-ended upper and lower both sides and third sealing washer and middle section post inner wall sliding seal cooperation at test passageway and test hole.
Therefore, the invention has the following beneficial effects: 1. the guide upright columns are arranged, so that the coaxiality of the steel pipe section and the plastic pipe section in the inserting process is ensured, and the air tightness of the steel-plastic conversion pipe fitting after assembly is ensured; 2. the inner wall of the pipe fitting is sealed by adopting the inward extending type sealing and extruding, so that the pipe fitting cannot be stressed axially, and the accuracy of air tightness detection is guaranteed; 3. be provided with and aerify stopping mechanism and linkage nature between the structure is strong, accomplishes the shutoff after sealed, just can carry out stopping, aerify the operation, and for automatic triggering, degree of automation is high.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is an enlarged view at a in fig. 1.
Fig. 3 is an enlarged view at b in fig. 1.
Fig. 4 is an enlarged view at c in fig. 3.
Fig. 5 is an enlarged view at d in fig. 1.
Fig. 6 is a schematic structural view of a steel pipe section and a plastic pipe section before assembly.
Fig. 7 is a schematic view of the assembled steel and plastic pipe sections.
Fig. 8 is a schematic structural diagram of the present invention before assembly and detection.
Fig. 9 is an enlarged view at e in fig. 8.
FIG. 10 is a schematic view of the structure of a steel pipe section and a plastic pipe section just assembled according to the present invention.
Fig. 11 is an enlarged view at f in fig. 10.
Fig. 12 is an enlarged view at g in fig. 10.
FIG. 13 is a schematic view of the inflation mechanism of the present invention inflating into the inflation retaining mechanism.
Fig. 14 is an enlarged view at h in fig. 13.
FIG. 15 is an enlarged view of the structure of the inflation retaining mechanism after the air pressure in the pressure maintaining cavity is stabilized.
1: a base plate; 2: positioning a base; 3: lifting the pressure head; 4: a pipe fitting positioning seat; 401: a guide upright post positioning hole; 402: a first inflation port; 5: a guide upright post; 501: an upper section of column; 502: a middle section column; 503: a lower section column; 504: a sliding shaft; 505: an upper seal ring positioning groove; 506: an upper sealing ring; 507: a lower seal ring positioning groove; 508: a lower seal ring; 509: closing the plate; 510: a pressure maintaining cavity; 511: a test well; 512: a test channel; 513: a second inflation port; 514: a first seal ring; 515: a second seal ring; 516: a third seal ring; 6: an inflation retaining mechanism; 601: a communicating piston bore; 602: a communicating piston; 603: a backstop piston bore; 604: a backstopping piston; 605: a top rod; 606: a first spring; 607: a backstop bolt; 608: a second spring; 609: a third inflation port; 610: an air intake passage; 611: a slide bar hole; 612: a pin hole; 7: an inflation mechanism; 701: an inflatable cylinder; 702: a pressurizing piston; 703: a pressure maintaining piston; 704: a piston rod; 705: a third spring; 706: an air pressure balancing hole; 707: an air outlet; 8: an air tube; 9: a steel-plastic conversion pipe fitting; 901: a plastic pipe section; 902: a steel pipe section.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 15, the natural gas pipe fitting assembling and detecting apparatus according to this embodiment at least includes a bottom plate 1, a positioning base 2 disposed on the bottom plate 1, and a lifting ram 3 located above the positioning base 2, the positioning base 2 includes a pipe fitting positioning seat 4 and a guide upright post 5, a guide upright post positioning hole 401 is disposed at the top of the pipe fitting positioning seat 4, the lower end of the guide upright post 5 is clamped in the guide upright post positioning hole 401, and the guide upright post 5 and the guide upright post positioning hole 401 are detachably assembled.
The guide upright post 5 is sequentially divided into an upper section post 501, a middle section post 502 and a lower section post 503 from top to bottom, the bottom of the upper section post 501 is fixed with a sliding shaft 504, the middle section post 502 and the lower section post 503 are both tubular, the middle section post 502 and the lower section post 503 are both sleeved on the sliding shaft 504 and are both in sliding sealing fit with the sliding shaft 504, a moving gap is reserved between the upper section post 501 and the middle section post 502, and a moving gap is reserved between the middle section post 502 and the lower section post 503; an annular inclined plane is arranged at the outer edge of the upper section column 501 close to the middle section column 502, an annular inclined plane is also arranged at the outer edge of the middle section column 502 close to the upper section column 501, the annular inclined planes of the upper section column and the middle section column form an upper sealing ring positioning groove 505, an upper sealing ring 506 is arranged in the upper sealing ring positioning groove 505, and the upper sealing ring 506 is an O-shaped sealing ring; an annular inclined surface is arranged at the outer edge of the middle section column 502 close to the lower section column 503, an annular inclined surface is also arranged at the outer edge of the lower section column 503 close to the middle section column 502, the annular inclined surfaces of the two form a lower sealing ring positioning groove 507, a lower sealing ring 508 is arranged in the lower sealing ring positioning groove 507, and the lower sealing ring 508 is an O-shaped sealing ring.
The lower opening of the inner hole of the lower column 503 is sealed by a sealing plate 509, and the inner hole of the lower column 503 between the lower end of the sliding shaft 504 and the sealing plate 509 forms a pressure maintaining cavity 510; the middle section column 502 is provided with a test hole 511 penetrating through the inner wall and the outer wall, the sliding shaft 504 is internally provided with a test channel 512, one end of the test channel 512 is communicated with the test hole 511 on the middle section column 502, and the other end is communicated with the pressure maintaining cavity 510.
A first inflation hole 402 penetrating through the inner wall and the outer wall is transversely formed in the pipe fitting positioning seat 4, a second inflation hole 513 penetrating through the inner wall and the outer wall is transversely formed in the lower section column 503, and the first inflation hole 402 corresponds to and is communicated with the second inflation hole 513.
Be equipped with an inflation stopping mechanism 6 in the sliding shaft 504, it includes intercommunication piston hole 601, intercommunication piston 602, stopping piston hole 603 and stopping piston 604 at least to inflate stopping mechanism 6, intercommunication piston hole 601 and stopping piston hole 603 are all radially located in sliding shaft 504 and the central axis collineation between them, intercommunication piston 602 locate in the intercommunication piston hole 601 and with intercommunication piston hole 601 sliding seal cooperation, stopping piston 604 locate in the stopping piston hole 603 and with stopping piston hole 603 sliding seal cooperation.
One end of the communicating piston hole 601 is provided with a third inflation hole 609 communicated to the outer wall of the sliding shaft 504, the other end of the communicating piston hole is communicated with the backstop piston hole 603, and the third inflation hole 609 can be communicated with a second inflation hole 513 on the lower section column 503 when the sliding shaft 504 moves downwards to the extreme position; a top rod 605 is arranged on one side of the communicating piston 602 facing the stopping piston 604, one end of the top rod 605 is fixed with the communicating piston 602, the other end of the top rod can be contacted with the stopping piston 604, and a first spring 606 for restoring the communicating piston 602 is sleeved on the top rod 605.
One end of the check piston hole 603 facing the communication piston hole 601 is communicated with the test channel 512, the other end of the check piston hole is provided with a sliding rod hole 611 communicated with the outer wall of the sliding shaft 504, one side of the check piston 604 facing the sliding rod hole 611 is provided with a check bolt 607, one end of the check bolt 607 is fixed with the check piston 604, the other end of the check bolt 607 is slidably arranged in the sliding rod hole 611, the inner wall of the lower column 503 is provided with a bolt hole 612 capable of being inserted into the check bolt 607, and the check bolt 607 is sleeved with a second spring 608 for restoring the check piston 604.
An air inlet channel 610 is arranged in the sliding shaft 504, one end of the air inlet channel 610 is communicated with the inner wall of the communicating piston hole 601, and the other end of the air inlet channel 610 is communicated with the pressure maintaining cavity 510; when the communication piston 602 is located at the extreme position of the end of the communication piston hole 601 where the third inflation hole 609 is provided, the communication piston 602 cuts off the opening of the intake passage 610 located at the inner wall of the communication piston hole 601; when the communication piston 602 moves to the limit position toward the check piston 604, the intake passage 610 communicates with the third charging hole 609.
The bottom plate 1 is provided with an inflating mechanism 7, the inflating mechanism 7 at least comprises an inflating cylinder 701, a pressurizing piston 702 and a pressure maintaining piston 703, the inflating cylinder 701 is erected on the bottom plate 1, the pressurizing piston 702 and the pressure maintaining piston 703 are both slidably arranged in the inflating cylinder 701, the pressurizing piston 702 is positioned above the pressure maintaining piston 703, the top surface of the pressurizing piston 702 is vertically fixed with a piston rod 704, and the lower side of the pressure maintaining piston 703 is provided with a third spring 705 for returning the pressure maintaining piston 703; an air pressure balance hole 706 is formed in the side wall of the inflation cylinder 701 below the pressure maintaining piston 703, an air outlet 707 is formed in the side wall of the inflation cylinder 701 between the pressurizing piston 702 and the pressure maintaining piston 703, and an outer opening of the air outlet 707 is communicated with the first inflation hole 402 through an air pipe 8.
The outer wall of the lower column 503 is embedded with a first sealing ring 514 in the circumferential direction, the first sealing ring 514 is distributed on the upper and lower sides of the opening on the outer side of the second inflating hole 513, and the first sealing ring 514 is in sliding sealing fit with the inner wall of the guide column positioning hole 401.
And a second sealing ring 515 is embedded in the outer wall of the sliding shaft 504 in the circumferential direction, the second sealing ring 515 is distributed on the upper side and the lower side of the opening on the outer side of the third inflating hole 609, and the second sealing ring 515 is in sliding sealing fit with the inner wall of the lower section column 503.
The outer wall of the sliding shaft 504 is embedded with a third sealing ring 516 in the circumferential direction, the third sealing ring 516 is distributed on the upper and lower sides of the opening for communicating the testing channel 512 with the testing hole 511, and the third sealing ring 516 is in sliding sealing fit with the inner wall of the middle column 502.
In the initial state, the second inflation hole 513 and the third inflation hole 609 are staggered up and down, and are disconnected. In the inflation retaining mechanism 6, the communicating piston 602 is acted by a first spring 606 and is positioned at the limit position of one end of the communicating piston hole 601 provided with a third inflation hole 609, an opening of an air inlet channel 610 positioned on the inner wall of the communicating piston hole 601 is cut off, the retaining piston 604 is acted by a second spring 608, one end of the retaining piston is abutted against the ejector rod 605, and a retaining bolt 607 is positioned in a sliding rod hole 611 and does not extend out, as shown in fig. 4.
When the steel-plastic conversion pipe fitting 9 is assembled, the steel pipe section 902 and the plastic pipe section 901 are sequentially sleeved on the guide upright post 5 for positioning, the lower end of the plastic pipe section 901 is in top contact with the upper end of the steel pipe section 902, the lower end of the steel pipe section 902 is in top contact with the top surface of the pipe fitting positioning seat 4, as shown in fig. 8 and 9, and meanwhile, the top end of the plastic pipe section 901 is higher than the top end of the upper section column 501.
After the steel pipe section 902 and the plastic pipe section 901 are positioned, the lifting pressure head 3 starts to move downwards, and meanwhile, the plastic pipe section 901 and the piston rod 704 are pressed downwards. The plastic pipe section 901 moves downwards, and the lower opening of the plastic pipe section 901 is gradually clamped on the outer wall of the upper end of the steel pipe section 902. In the inflation mechanism 7, the pressurizing piston 702 moves down with the piston rod 704, and compresses air between the pressurizing piston 702 and the pressure-holding piston 703 to generate high pressure, and when the thrust generated by the high pressure on the pressure-holding piston 703 is larger than the thrust generated by the third spring 705 on the pressure-holding piston 703, the pressure-holding piston 703 also starts moving down to compress the third spring 705.
When the plastic pipe section 901 moves downwards to be flush with the top end of the upper section column 501, the lifting pressure head 3 simultaneously moves the lower section column 501 downwards, the upper section column 501 moves downwards to be close to the middle section column 502, the upper sealing ring positioning groove 505 becomes small, the upper sealing ring 506 in the upper sealing ring positioning groove 505 is pressed, the upper sealing ring 506 is pressed and expanded, and the plastic pipe section 901 is attached to the inner wall of the plastic pipe section to realize sealing. After the upper section column 501 and the middle section column 502 are abutted, the upper section column 501 pushes the middle section column 502 to move downwards together, the middle section column 502 is close to the lower section column 503, the lower sealing ring positioning groove 507 becomes small, the lower sealing ring 508 in the lower sealing ring positioning groove 507 is pressed, the lower sealing ring 508 is pressed and expanded, and the inner wall of the steel pipe section 902 is attached to realize sealing. Meanwhile, during the downward movement of the upper column 501, the sliding shaft 504 moves downward with the upper column 501.
When the plastic pipe section 901 moves downwards to the position where the assembly with the steel pipe section 902 is completed, the lifting pressure head 3 stops moving downwards, at the moment, the upper sealing ring 506 seals the inner wall of the plastic pipe section 901, and the lower sealing ring 508 seals the inner wall of the steel pipe section 902; the third inflation hole 609 on the sliding shaft 504 moves downward to a position corresponding to the second inflation hole 513 and is communicated with the second inflation hole, high-pressure gas between the pressurizing piston 702 and the pressure maintaining piston 703 starts to enter the communicating piston hole 601 through the air outlet 707, the air pipe 8, the first inflation hole 402, the second inflation hole 513 and the third inflation hole 609 in sequence, and high-pressure gas between the pressurizing piston 702 and the pressure maintaining piston 703 can be replenished by pushing the pressure maintaining piston 703 upwards through the third spring 705.
One end of the communicating piston 602 is acted by the high-pressure gas in the third gas charging hole 609 to start to move towards the direction of the check piston 604, meanwhile, the push rod 605 drives the check piston 604 and the check bolt 607 to move towards the direction of the bolt hole 612 together, and one end of the check bolt 607 extends into the bolt hole 612, so that the check effect of the sliding shaft 504 is realized, as shown in fig. 13 and 14, and the sealing stability of the upper and lower sealing rings is ensured. And after the communicating piston 602 moves towards the plug hole 612, the air inlet passage 610 is communicated with the third air charging hole 609, high-pressure gas in the third air charging hole 609 can enter the pressure maintaining cavity 510 through the air inlet passage 610 to be used as a test gas source, the pressure maintaining cavity 510 is communicated with the test hole 511 through the test passage 512, namely, the pressure maintaining cavity 510 is communicated with an inner cavity of the steel-plastic switching pipe fitting 9 positioned between the upper sealing ring and the lower sealing ring, and the joint of the plastic pipe section 901 and the steel pipe section 902 is positioned in the section.
When the air pressure in the pressure holding cavity 510 is stabilized, the air pressure in the pressure holding cavity 510 is the same as the air pressure between the pressurizing piston 702 and the pressure holding piston 703, at this time, the air pressure received at the two ends of the communicating piston 602 is the same, and one end of the communicating piston is acted by the first spring 606, and then the communicating piston is retreated to the limit position of the end, in which the third inflation hole 609 is arranged, of the communicating piston hole 601, the air inlet channel 610 and the third inflation hole 609 are cut off, at this time, the pressure holding cavity 510 is in a pressure holding state, that is, the state of the butt joint of the pressure holding detection plastic pipe segment 901.
Since the end of the check piston hole 603 facing the communicating piston hole 601 is communicated with the test channel 512, the check piston 604 will not move backward under the action of the high pressure gas, and still be in the locked and check state of the sliding shaft 504 by pushing the check pin 607, as shown in fig. 15.
At this moment, the lifting pressure head 3 can rise to return to the initial position, and an operator can detach the guide upright post 5 together with the steel-plastic conversion pipe fitting 9 from the pipe fitting positioning seat 4, and stands for a period of time, and determines whether leakage exists at the butt joint of the plastic pipe section 901 and the steel pipe section 902 by monitoring whether the gas in the pressure maintaining cavity 510 is reduced.
The guide upright columns 5 can be arranged in a plurality of ways, and one guide upright column can be replaced by one guide upright column to be arranged on the pipe fitting positioning seat 4 for assembling and detecting the next pipe fitting when one guide upright column is used for standing and detecting the air tightness of the steel-plastic conversion pipe fitting 9.
Claims (5)
1. The utility model provides a natural gas pipe fitting assembly, check out test set, includes bottom plate (1) at least, locates location base (2) on bottom plate (1) to and be located lift pressure head (3) of location base (2) top, its characterized in that: the positioning base (2) comprises a pipe fitting positioning seat (4) and a guide upright post (5), a guide upright post positioning hole (401) is formed in the top of the pipe fitting positioning seat (4), and the lower end of the guide upright post (5) is clamped in the guide upright post positioning hole (401);
the guide upright post (5) is sequentially divided into an upper section post (501), a middle section post (502) and a lower section post (503) from top to bottom, a sliding shaft (504) is fixed at the bottom of the upper section post (501), the middle section post (502) and the lower section post (503) are both in a tubular shape, the middle section post (502) and the lower section post (503) are both sleeved on the sliding shaft (504) and are both in sliding sealing fit with the sliding shaft (504), a moving gap is reserved between the upper section post (501) and the middle section post (502), and a moving gap is reserved between the middle section post (502) and the lower section post (503); an annular inclined plane is arranged at the outer edge of the upper section column (501) close to the middle section column (502), an annular inclined plane is also arranged at the outer edge of the middle section column (502) close to the upper section column (501), the annular inclined planes of the upper section column and the middle section column form an upper sealing ring positioning groove (505), and an upper sealing ring (506) is arranged in the upper sealing ring positioning groove (505); an annular inclined plane is arranged at the outer edge of the side, close to the lower section column (503), of the middle section column (502), an annular inclined plane is also arranged at the outer edge of the side, close to the middle section column (502), of the lower section column (503), the annular inclined planes of the annular inclined plane and the lower section column form a lower sealing ring positioning groove (507), and a lower sealing ring (508) is arranged in the lower sealing ring positioning groove (507);
the lower opening of the inner hole of the lower section column (503) is sealed by a sealing plate (509), and the inner hole of the lower section column (503) between the lower end of the sliding shaft (504) and the sealing plate (509) forms a pressure maintaining cavity (510); a testing hole (511) penetrating through the inner wall and the outer wall is formed in the middle section column (502), a testing channel (512) is arranged in the sliding shaft (504), one end of the testing channel (512) is communicated with the testing hole (511) in the middle section column (502), and the other end of the testing channel is communicated with the pressure maintaining cavity (510);
a first inflation hole (402) penetrating through the inner wall and the outer wall is transversely formed in the pipe fitting positioning seat (4), a second inflation hole (513) penetrating through the inner wall and the outer wall is transversely formed in the lower section column (503), and the first inflation hole (402) corresponds to and is communicated with the second inflation hole (513);
an inflation retaining mechanism (6) is arranged in the sliding shaft (504), the inflation retaining mechanism (6) at least comprises a communicating piston hole (601), a communicating piston (602), a retaining piston hole (603) and a retaining piston (604), the communicating piston hole (601) and the retaining piston hole (603) are radially arranged in the sliding shaft (504), the central axes of the communicating piston hole and the retaining piston hole are collinear, the communicating piston (602) is arranged in the communicating piston hole (601) and is in sliding sealing fit with the communicating piston hole (601), and the retaining piston (604) is arranged in the retaining piston hole (603) and is in sliding sealing fit with the retaining piston hole (603);
one end of the communicating piston hole (601) is provided with a third inflating hole (609) communicated to the outer wall of the sliding shaft (504), the other end of the communicating piston hole is communicated with the backstop piston hole (603), and the third inflating hole (609) can be communicated with a second inflating hole (513) on the lower section column (503) when the sliding shaft (504) moves downwards to the extreme position; a push rod (605) is arranged on one side of the communicating piston (602) facing the stopping piston (604), one end of the push rod (605) is fixed with the communicating piston (602), the other end of the push rod can be in contact with the stopping piston (604), and a first spring (606) for restoring the communicating piston (602) is sleeved on the push rod (605);
one end, facing the communicating piston hole (601), of the backstop piston hole (603) is communicated with the test channel (512), the other end of the backstop piston hole is provided with a sliding rod hole (611) communicated with the outer wall of the sliding shaft (504), one side, facing the sliding rod hole (611), of the backstop piston (604) is provided with a backstop bolt (607), one end of the backstop bolt (607) is fixed with the backstop piston (604), the other end of the backstop bolt is slidably arranged in the sliding rod hole (611), the inner wall of the lower-section column (503) is provided with a bolt hole (612) capable of being inserted into the backstop bolt (607), and the backstop bolt (607) is sleeved with a second spring (608) for returning the backstop piston (604);
an air inlet channel (610) is arranged in the sliding shaft (504), one end of the air inlet channel (610) is communicated with the inner wall of the communicating piston hole (601), and the other end of the air inlet channel (610) is communicated with the pressure maintaining cavity (510); when the communicating piston (602) is located at the limit position of one end of the communicating piston hole (601) provided with the third inflation hole (609), the communicating piston (602) cuts off the opening of the air inlet channel (610) located on the inner wall of the communicating piston hole (601); when the communication piston (602) moves to the limit position towards the direction of the anti-backing piston (604), the air inlet passage (610) is communicated with the third air charging hole (609).
2. The natural gas pipe fitting assembling and detecting device according to claim 1, wherein: the bottom plate (1) is provided with an inflating mechanism (7), the inflating mechanism (7) at least comprises an inflating cylinder (701), a pressurizing piston (702) and a pressure maintaining piston (703), the inflating cylinder (701) is erected on the bottom plate (1), the pressurizing piston (702) and the pressure maintaining piston (703) are both slidably arranged in the inflating cylinder (701), the pressurizing piston (702) is positioned above the pressure maintaining piston (703), the top surface of the pressurizing piston (702) is vertically fixed with a piston rod (704), and the lower side of the pressure maintaining piston (703) is provided with a third spring (705) for restoring the pressure maintaining piston (703); an air pressure balance hole (706) is formed in the side wall of the inflating cylinder body (701) located below the pressure maintaining piston (703), an air outlet hole (707) is formed in the side wall of the inflating cylinder body (701) located between the pressurizing piston (702) and the pressure maintaining piston (703), and an opening in the outer side of the air outlet hole (707) is communicated with the first inflating hole (402) through an air pipe (8).
3. The natural gas pipe fitting assembling and detecting device according to claim 1, wherein: the outer wall circumference of lower section post (503) inlays and is equipped with first sealing washer (514), first sealing washer (514) distribute in second aerify hole (513) outside open-ended upper and lower both sides and first sealing washer (514) and guide stand locating hole (401) inner wall sliding seal cooperation.
4. The natural gas pipe fitting assembling and detecting device according to claim 1, wherein: and a second sealing ring (515) is embedded in the circumferential direction of the outer wall of the sliding shaft (504), the second sealing ring (515) is distributed on the upper side and the lower side of an outer opening of the third inflating hole (609), and the second sealing ring (515) is in sliding sealing fit with the inner wall of the lower section column (503).
5. The natural gas pipe fitting assembling and detecting device according to claim 1, wherein: the outer wall circumference of slip axle (504) inlays and is equipped with third sealing washer (516), third sealing washer (516) distribute in test passageway (512) and test hole (511) intercommunication open-ended upper and lower both sides and third sealing washer (516) and middle section post (502) inner wall sliding seal cooperation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910496624.XA CN110216441B (en) | 2019-06-10 | 2019-06-10 | Natural gas pipe fitting assembly and detection equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910496624.XA CN110216441B (en) | 2019-06-10 | 2019-06-10 | Natural gas pipe fitting assembly and detection equipment |
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| CN110216441A CN110216441A (en) | 2019-09-10 |
| CN110216441B true CN110216441B (en) | 2020-07-24 |
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| US7716964B2 (en) * | 2007-01-08 | 2010-05-18 | Kulite Semiconductor Products, Inc. | Leak detector for a pressurized cylinder |
| EP2527812A1 (en) * | 2010-01-22 | 2012-11-28 | Nittan Valve Co., Ltd. | Method of testing air-tightness of hermetically sealed lash adjuster |
| CN105203276A (en) * | 2015-10-15 | 2015-12-30 | 宁波新合博园林机械有限公司 | Pipe fitting airtightness testing machine |
| CN108844696B (en) * | 2018-07-09 | 2020-05-15 | 平湖市超凯科技有限公司 | Natural gas pipe fitting check out test set |
| CN109469830B (en) * | 2018-11-29 | 2020-02-18 | 无锡华润燃气有限公司 | Quick detection device of natural gas line |
| CN109374222B (en) * | 2018-12-12 | 2021-01-26 | 济南亨利元汽车零配件有限公司 | Air tightness detection device and method for automobile parts |
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Effective date of registration: 20200702 Address after: 211100 China Resources Gas Nanjing Jiangning R & D Center (Jiangning Development Zone), No. 8, Yougu Road, Jiangning District, Nanjing, Jiangsu Province Applicant after: CHINA RESOURCES (NANJING) MUNICIPAL DESIGN Co.,Ltd. Address before: 310003 Room 202, Unit 5, 8 Yanzhi New Village, Xiacheng District, Hangzhou City, Zhejiang Province Applicant before: Zhao Guifeng |
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