Method for molding spiral equal-wall-thickness hollow screw pump stator rubber bushing

Abstract

The invention belongs to the technical field of rubber machining, and relates to a method for molding a spiral equal-wall-thickness hollow screw pump stator rubber bushing. The method comprises the following steps of: firstly mounting a screw pump stator, a mandrel and a runner device to a molding device, and placing the screw pump stator, the mandrel and the runner device in a pre-heater to control temperature and pre-heat for 30 minutes; arranging a cold feed extruder, wherein the temperature of a feed section is 50 DEG C, the temperature of an extrusion section is 75 DEG C, the temperature of a machine head section is 85 DEG C and the temperature of a screw is 80 DEG C; drawing and locking an opening mould, a mould tool and the runner device, and starting the molding device to carry out extrusion at 95 DEG C, in 20rpm and under the machine head pressure of 40Mpa; carrying out processes of exhausting, overflowing, pressure-maintaining and vulcanizing to keep compactness of a rubber material; and carrying out an overflow process on a forward material of the rubber material to ensure homogeneity of full length quality, and carrying out vulcanization molding according to preset parameters of a vulcanization process. The method for molding the spiral equal-wall-thickness hollow screw pump stator rubber bushing, disclosed by the invention, has the advantages of being reliable in principle, simple in process, reasonable in production condition, effective for control process, good in product quality and environment for friendliness.

Description

Technical field: [0001] The invention belongs to the technical field of rubber processing, and relates to a novel method for forming a rubber bushing of a hollow screw pump stator with a spiral constant wall thickness, in particular to a hollow tubular, constant wall thickness, super The forming method of long, large and special-shaped rubber products. Background technique: [0002] At present, the pump inspection period of the PCP is still relatively short. The thickness of the stator rubber of the conventional PCP is uneven, and the expansion of the rubber is different in different places when the pump is running underground. The friction force of the stator and the rotor is larger where the expansion is large, resulting in friction. Large heat and large expansion. This vicious cycle not only reduces the mechanical efficiency, but also has a great impact on the pump efficiency and single-stage pressure bearing of the downhole pump, which increases the speed of rubber fatig...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the traditional non-spiral equal-wall-thickness screw pump stator internal rubber lining molding method is to use a press for pressure injection operation, put the heat-cured rubber into the pressure injection cylinder, and use oil pressure in a short time. Internal high pressure is forced to inject pressure into the cavity of the stator. The injection time should not be too long. Too long will easily cause the viscosity of the rubber to increase. The huge pressure of this method will easily cause deformation and bursting of the screw pump stator with equal wall thickness. The plasticizing effect of the material cannot be guaranteed, and the product life and product quality cannot be guaranteed; some of them use the reciprocating screw injection molding device to inject the screw plasticized plastic material according to the maximum reciprocating injection volume, and repeat several cycles Only then can the workpiece be filled, and repeated pauses and connections of the rubber material will easily cause problems such as uneven quality

[0005] Patent No. CN200410024397.4 applied by Qingdao University of Science and Technology discloses a one-step injection molding vulcanization equipment and method for ordinary screw pump stator rubber bushings. The spiral tube wall of the hollow screw pump stator with equal wall thickness is thin (6-8mm) and cannot withstand high pressure

In addition, the thickness of the rubber bushing with equal wall thickness is very thin (less than 10mm) and long (greater than 7m), and it cannot be formed by high-pressure injection method, and it is difficult to complete the injection of rubber bushing with equal wall thickness.

Images