CN2472028Y - Self tightened sealer with pull-bar - Google Patents

Abstract

The utility model relates to a drawbar self-tightening sealing device, which is the special equipment for the production of hot-pressing visco-plastic composite seamless steel pipe. The utility model is characterized in comprising a plug, a sealing ring, a centering ring, a drawbar, an air inlet and a check valve. The sealing ring is sleeved on the plug; one end of the drawbar is inserted into the plug and the other end is inserted into the air inlet; the drawbar is matched with the plug, and the center hole of the air inlet through the centering ring which is arranged on the drawbar; the sealing ring is arranged on the inner side of the air inlet of the drawbar, and the outer end of the air inlet is connected with the check valve. The pressure-filled self-tightening sealing between the seamless steel pipe and the plastic pipe can be enabled, and the joint working procedure for the two pipe walls can be completed, which is the preparation for the hot-pressing and composite working procedure. The utility model also has the advantages of simple structure, safe and reliable operation and low manufacturing cost.

Description

Pull bar self-energized seal device

The utility model relates to a kind of steel-plastic composite pipe sealed composite device, the sealed composite device of a kind of composite seam-less steel pipe with thermocompressed plastic of definitely saying so.

It generally all is Coating Steel Pipe and common seamless steel pipe inner lining plastic tube that steel is in the market moulded pipe, and this tube material and tube wall is thick, and its manufacturing process essence is under mechanical force, and outer diameter of steel pipes dwindles the generation steel and moulds interference fit and reach composite goal.But because plastic tube can be elongated in the pultrusion process, the creep properties of plastics can grow with time or the effect of temperature variation factor, make steel mould the interference combination force and fade away, thereby steel being moulded produce between pipe slides, in addition loosening.Simultaneously, this class steel-plastic composite pipe appearance poor, Heavy Weight, environmental-protecting performance is unreliable, and cost is also higher.At the problems referred to above, our company develops good, in light weight, the withstand voltage height of successfully a kind of outward appearance, good new product of environment protect one composite seam-less steel pipe with thermocompressed plastic of fire prevention buried character energy through walls.Its key technology difficult problem is the whole self-tightening sealing technology between seamless steel pipe wall and plastic tube wall.

The purpose of this utility model is: a kind of nucleus equipment one pull bar self-energized seal device of producing composite seam-less steel pipe with thermocompressed plastic, solving whole self-tightening sealing technical barrier between seamless steel pipe and plastic tube wall is provided.

The purpose of this utility model realizes by implementing following technical proposals: pull bar self-energized seal device, it is characterized in that: constitute by plug, seal ring, centering ring, pull bar, air inlet head and safety check, seal ring is installed on the plug, the one end dress of pull bar is inserted on the plug, the other end dress is inserted in the air inlet head, pull bar connects the inboard suit seal ring of the air inlet head of pull bar, an air inlet outer termination loaded check valve by suit centering ring realization and plug, an air inlet center thereon.Safety check is contained in the endoceliac plug screw of valve by valve body, and needle and seal ring that tension spring, cover are inserted in this spring constitute; Its additional technical feature is: the self-sealing ring that seal ring adopts flexible rubber to make.By the requirement of composite seam-less steel pipe with thermocompressed plastic pressurising compound working procedure, appearance before entering the thermocompressed plastic compound working procedure, must be filled with gas inner layer plastic tube after the inner layer plastic tube of coating adhesive has been inserted in outer seamless steel pipe.Owing between plastic tube and steel pipe certain fit up gap is arranged before pressurized gas, after the pressurized gas, it is big that the inner plastic bore becomes, in the case, after breaking away from the pressurising system, must make intraductal atmospheric pressure keep constant, after inner layer plastic tube is subjected to compression swelling to be close on the seamless steel pipe wall, can changes automatic compound production line over to and carry out heat pressure adhesive.This pressurising makes steel pipe and moulds the manufacturing process that tube wall is fitted, and is finished by the utility model.Specific operation are: with a left side, right two centering rings are sleeved on the two ends of pull bar, pull bar one end suit upper sealing ring is again loaded onto plug then, make the pull bar termination by thread cartridge in the tapped hole in plug center portion, the pull bar dress that then will have plug seal ring and centering ring inserts in the plastic tube, make plug contact fastening with the plastic tube termination, plastic tube appearance coated with adhesive, to have plug, the plastic tube of pull bar is packed in the seamless steel pipe, steel tube head and plug fasten, to be set with the air inlet head of seal ring again, dress inserts the other end that steel is moulded pipe, the pull bar termination is inserted in the center hole of air inlet head by the screw thread dress, and air inlet head and steel are moulded pipe end and are fastened, the safety check that will have seal ring at last is by being threaded onto in a fit of anger, mould in the pipe work that pull bar self-energized seal device is installed at steel and promptly accuse and finish,, get ready for the pressurising compound working procedure carries out.

Advantage of the present utility model is: good seal performance, steel is moulded the air inlet head of pipe by the pull bar self-tightening sealing device, realizes self-tightening sealing charge into pressurized gas in plastic tube after, can keep constant voltage effectively, guarantee that plastic tube expands and the steel pipe inwall is close to, eliminate the fit up gap between two pipes.Seal ring in the utility model safety check is made by flexible rubber, has good coating performance, after air inlet head and the disengaging of pressurising device, under the tension force acting in conjunction of gas pressure and spring, the needle returning position acts on seal ring and forms self-tightening sealing in valve.And the seal ring that is contained between plug and plastic tube also adopts flexible rubber to make, because sealing ring base diameter approximates the internal diameter of compound preceding plastic tube, and the more compound back of lip limit Outside diameter plastic tube internal diameter becomes big back magnitude of interference in addition, therefore after inflation is pressed in the pipe, seal ring lip limit is affixed on inner tube wall automatically, realizes self-tightening sealing.Plain cushion commonly used, " O " type ring, the hardware sealing configuration does not all reach the conditional request of pressurising compound working procedure.This device also has simple in structure, advantage such as safe and reliable, low cost of manufacture.

The utility model has following accompanying drawing: Fig. 1 to look longitudinal section and fundamental diagram for the utility model master; Fig. 2 is the flexible lips self-sealing ring vertical profile schematic representation in the device; Mark among the figure: 1 is plug, and 2 is the flexible lips self-sealing ring, and 3 is centering ring, 4 is pull bar, and 5 for treating compound sticking plastic steel pipe, and 6 are the air inlet head, 7 is packing ring, and 8 is plug screw, and 9 is spring, 10 is needle, and 11 is check valve body, and 12 is seal ring, 3 is suction port, 14 is the bottom of self-sealing ring 2, and 15 is the big end in lip limit of self-sealing ring 2, the 16 branch line pores for air inlet 6.

The utility model is described in further detail below in conjunction with accompanying drawing:

The utility model is by plug 1, seal ring 2, centering ring 3, pull bar 4, air inlet 6 and safety check are formed, wherein seal ring 2 is sleeved on the plug 1, the one end dress of pull bar 4 is inserted on the plug 1, the other end dress is inserted in the air inlet 6, pull bar 4 is realized itself and plug 1 by suit centering ring 3 thereon, the center hole centering of air inlet 6, air inlet 6 an inboard suit seal ring that connect pull bar 4, air inlet 6 an outer termination loaded check valve, and safety check is by valve body 11, be contained in the plug screw 8 in valve body 11 inner chambers, tension spring 9, needle 10 and seal ring 12 that cover is inserted in the spring 9 are formed.Pressurized gas enter this device by suction port 13, push safety check needle 10 open, enter safety check from the annular space of 10 of valve body 11 and needles, center hole by plug screw 8 enters air inlet 6 again, again through the branch line pore 16 of air inlet 6, enter steel and mould in the pipe, pressing in inner layer plastic tube is imposed makes it to expand is close to the steel pipe inwall.Because the seal action of seal ring 12 and plug seal ring 2, guaranteed that gas does not leak in the pipe, fill in the pipe with behind the pressurized gas, (end is the plug 1 that has seal ring to the black box at pipe two ends, the other end is the air inlet 6 of band seal ring) possible to the outer slippage of pipe that be subjected to that gas pressure produces, overcome by the pull bar that screw thread joins together with sealed at both ends assembly.Pull bar thickness and thread size are looked the axial tensile force of intraductal atmospheric pressure generation and are calculated definite by intensity.Centering ring in this device guarantees in when assembling device, and the tapped hole of plug and air inlet head can be easily and the pull bar center.Leaving the gap at plug and tube end, is to consider in the recombination process, and when outer layer pipe was subjected to the high temperature rapid heating, the thermal stretching amount of steel pipe was greater than the elongation of pull bar, and unlikely steel pipe and the pull bar of causing produces constraint mutually on axial length.

Claims (2)

1, a kind of pull bar self-energized seal device, it is characterized in that: this device is by plug (1), seal ring (2), centering ring (3), pull bar (4), air inlet head (6) and safety check are formed, seal ring (2) is sleeved on the plug (1), the one end dress of pull bar (4) is inserted on the plug (1), the other end dress is inserted in the air inlet head (6), pull bar (4) is realized itself and plug (1) by suit centering ring (3) thereon, air inlet head (6) center hole centering, connect the inboard suit seal ring of air inlet head (6) of pull bar (4), air inlet head (6) outer termination is equipped with by valve body (11), be contained in the plug screw (8) in valve body (11) inner chamber, tension spring (9), cover is inserted in the safety check that needle (10) in the spring (9) and seal ring (12) are formed.

2, according to the described pull bar self-energized seal of claim 1 device, it is characterized in that: the seal ring in the device (2) has the bowl type lip limit self-sealing ring of opening for the bottom.

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