A glue injection mold for a glue injection rotor of a screw pump

Abstract

The present application relates to a kind of screw pump glue rotor injection mold of hanging glue. Mainly solve the existing glue rotor injection mold of hanging glue, processing difficulty, high cost, the quality problem of the glue rotor of hanging glue processed.It is characterized in that: the spiral main body (2) outside is equipped with fixed tooling (3) and glue injection tooling (4) respectively, glue injection tooling (4) is opened tooling glue injection hole (41), the spiral main body (2) is opened and communicated with tooling glue injection hole (41) spiral main body glue injection hole (9).The screw pump glue rotor injection mold of hanging glue is low in processing difficulty, low in cost, and can better guarantee the processing quality of glue rotor of hanging glue.

Description

Technical Field

[0001] This invention relates to the field of mechanical oil extraction technology, specifically to a glue-coating rotor injection mold for a screw pump. Background Technology

[0002] Metal stator rubber-coated rotor screw pumps offer high pump efficiency and low torque, enabling operation without moving the tubing, significantly reducing the risk of pump inspection, workload, operation time, and costs. However, the processing of rubber-coated rotors, especially the rubber-coated rotor injection mold, is very difficult. Currently, the main body of the rubber-coated rotor injection mold is made by longitudinally splitting a nearly 8-meter-long round steel bar into two equal halves. Then, a large four-axis CNC machine tool mills a spiral groove on one side of each half of the bar, matching the size and profile of half the rotor. After processing, the two halves are joined together to form an injection mold with an inner cavity the size of the rotor. Due to the long bar and small spiral groove size, achieving a perfectly formed inner cavity the size of the rotor requires very high processing precision. Furthermore, the unevenness of the material makes it easy for defects to occur during the spiral groove processing, damaging the cutting tools. The varying thickness of the injection mold in different directions makes it difficult to straighten the rotor core, easily leading to uneven rubber coating. Current glue-coated rotor injection molds are not only difficult and costly to manufacture, but also cannot guarantee the quality of the glue-coated rotors. Summary of the Invention

[0003] To overcome the shortcomings of existing glue-coated rotor injection molds, which are difficult to process, costly, and produce poor-quality glue-coated rotors, this invention provides a screw pump glue-coated rotor injection mold that is easy to process, low in cost, and can better guarantee the processing quality of the glue-coated rotor.

[0004] The technical solution of the present invention is: a screw pump glue-coating rotor injection mold, comprising a screw body, wherein a fixing fixture and an injection fixture are respectively provided on the outside of the screw body, the injection fixture has an injection hole, and the screw body has an injection hole communicating with the injection hole.

[0005] The two ends of the spiral body are connected to limit plugs, and several straightening pins are connected to the side wall of the spiral body.

[0006] The spiral body is equipped with a rotor core, and the two ends of the rotor core are in contact with the limiting screw plugs.

[0007] The glue injection fixture consists of two units. The inner walls of both units are fitted to the outer surface of the spiral body. Both units have annular glue injection grooves on their inner walls, and one of the units has a glue injection hole that communicates with the glue injection groove.

[0008] The number of fixed fixtures is two, and the distance between the two fixed fixtures is no more than 4 times the lead of the glued rotor.

[0009] The fixing fixture consists of two units, the inner walls of which are fitted to the outer surface of the spiral body.

[0010] The spiral body is composed of two monomers.

[0011] The straightening pins are in at least two sets, with at least three straightening pins in each set, and are evenly distributed along the radial direction of the spiral body.

[0012] The present invention has the following beneficial effects: Due to the above-mentioned solution, the spiral body is made of precision bright tube through extrusion or hydraulic processing, and then divided into two equal halves after forming. This results in low raw material costs, simple processing technology, low processing difficulty, and low processing costs. The spiral body has a uniform thickness. When straightening the rotor mold core, it is only necessary to control the straightening pins to be screwed in to the same length, which better ensures the uniform thickness of the rubber coating layer on the rotor and improves the service life of the rubber-coated rotor. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 This is a structural diagram of a fixed tooling;

[0015] Figure 3 This is a structural diagram of the glue injection tool, where Figure a is the upper part and Figure b is the lower part.

[0016] In the diagram, 1-limit plug, 2-screw body, 3-fixing fixture, 4-adhesive injection fixture, 5-rotor core, 6-rotating screw, 7-vent hole, 8-aligning hole, 9-screw body adhesive injection hole, 10-aligning pin, 11-fastening bolt, 41-fixture adhesive injection hole, 42-adhesive injection groove. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] Depend on Figures 1 to 3As shown, a screw pump adhesive-coated rotor injection mold includes a spiral body 2, which is formed from a precision bright tube by extrusion or hydraulic processing. The tube wall thickness is not less than 9mm. After forming, it is divided into two equal parts. The two ends of the spiral body 2 are connected by threaded limit plugs 1. Externally, a fixing fixture 3 and an injection fixture 4 are respectively provided. The injection fixture 4 has an injection hole 41, and the spiral body 2 has an injection hole 9 communicating with the injection hole 41. The injection fixture 4 consists of two parts, the inner walls of which fit with the outer surface of the spiral body 2. That is, when the two injection fixture parts are closed, their spiral groove profile is consistent with the outer surface profile of the spiral body. Both parts have an annular injection groove 42 on their inner walls, and one part has an injection hole 41 communicating with the injection groove 42. There are two fixing fixtures 3, and the distance between the two fixing fixtures 3 is not greater than four times the lead of the adhesive-coated rotor. Each fixed fixture 3 consists of two units, the inner walls of which are matched with the outer surface of the spiral body 2. That is, after the two fixed fixture units are closed, the spiral groove profile is consistent with the outer surface profile of the spiral body.

[0019] The spiral body 2 is equipped with a rotor core 5, and both ends of the rotor core 5 are in contact with the limiting plugs 1. The position of the rotor core 5 can be adjusted by rotating the limiting plugs 1. Several straightening holes 8 are opened on the side wall of the spiral body 2. There are at least two sets of straightening holes 8, and each set has at least 3 straightening holes 8, which are evenly distributed along the radial direction of the spiral body 2. A straightening pin 10 is connected to each straightening hole 8. By adjusting the length of the straightening pin 10 extending into the spiral body 2, the rotor core 5 can be straightened.

[0020] In use, first assemble the two spiral bodies 2 together and secure them with the fixing fixture 3. Place the rotor core 5 into the spiral body 2, install the limiting plugs 1 at both ends of the spiral body 2, and adjust the limiting screws on the limiting plugs 1 to limit the rotor core 5. Screw the straightening pin 10 into the straightening hole 8, adjust the screw length of the straightening pin 10, and straighten the rotor core 5 to the center. Install the glue injection fixture 4 at the glue injection hole 9 of the spiral body, connect the glue injection head of the glue injection machine to the interface of the glue injection hole 41 of the glue injection fixture, and press rubber into the mold. After the pressing is completed, remove the glue injection fixture 4, plug the glue injection hole 9 of the spiral body, replace the straightening pin 10, and send the mold into the vulcanizing furnace for vulcanization. After vulcanization, open the fixing fixture and take out the glued rotor.

Claims

1. A glue-applying mold for a screw pump rotor, comprising a screw body (2), characterized in that: The spiral body (2) is composed of two units. The spiral body (2) is provided with a fixing fixture (3) and a glue injection fixture (4) on its exterior. The glue injection fixture (4) has a glue injection hole (41) and the spiral body (2) has a glue injection hole (9) that communicates with the glue injection hole (41). The spiral body (2) is provided with a rotor core (5) inside. Several straightening pins (10) are connected to the side wall of the spiral body (2). The straightening pins (10) extend into the spiral body (2) to straighten the rotor core (5).

2. The glue-injection mold for the screw pump rotor according to claim 1, characterized in that: The spiral body (2) has two ends connected to limit plugs (1).

3. The glue-applying mold for the screw pump rotor according to claim 2, characterized in that: The rotor core (5) is in contact with the limiting plug (1) at both ends.

4. The glue-applying mold for the screw pump rotor according to claim 3, characterized in that: The glue injection fixture (4) consists of two units. The inner walls of the two units are in contact with the outer surface of the spiral body (2). The inner walls of the two units are provided with annular glue injection grooves (42), and one of the units is provided with a glue injection hole (41) that communicates with the glue injection grooves (42).

5. The glue-injection mold for the screw pump rotor according to claim 4, characterized in that: The number of fixed fixtures (3) is two, and the distance between the two fixed fixtures (3) is no more than 4 times the lead of the glued rotor.

6. The glue-applying mold for the screw pump rotor according to claim 5, characterized in that: The fixed fixture (3) is composed of two units, and the inner walls of the two units are matched with the outer surface of the spiral body (2).

7. The glue-injection mold for the screw pump rotor according to claim 6, characterized in that: The straightening pins (10) are in at least two groups, with at least three straightening pins (10) in each group, and are evenly distributed radially along the spiral body (2).

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