Steel-plastic composite positioning pin and large-diameter steel-plastic composite electric smelting sleeve pipe fitting

Abstract

The utility model discloses a steel-plastic composite positioning pin and a large-caliber steel-plastic composite electric melting sleeve pipe fitting, and relates to the field of pipe fitting manufacturing, the steel-plastic composite positioning pin comprises a positioning pin body, the positioning pin body comprises an inner core fixing piece and an outer surface plastic layer and is connected to a steel framework through threads, and the inner core fixing piece is made of metal materials; the outer surface plastic layer is made of the same material as a product, the locating pin is annularly arranged on the middle plane of the steel-plastic electric smelting sleeve pipe fitting and matched with a production mold, so that the freedom degree of a framework in the pipe fitting in all directions is restrained, and the locating problem of the embedded steel framework in the manufacturing process of the large-diameter steel-plastic composite electric smelting sleeve pipe fitting is effectively solved; the production efficiency and quality of pipe fittings are improved; and meanwhile, the protruding positioning pin on the central surface of the pipe provides a convenient and rapid balance hoisting point for subsequent installation and hoisting, and the position height of the pipe and the position height of the central line of the steel-plastic composite pipe to be connected can be ensured to be consistent, so that the installation efficiency is improved, and the connection quality of the whole pipeline is improved.

Description

Technical Field

[0001] The utility model relates to the field of pipe fitting manufacturing, in particular to a steel-plastic composite positioning pin and a large-diameter steel-plastic composite electric fusion sleeve pipe fitting. Background Art

[0002] Steel-plastic composite pipe fittings are a type of pipe fittings that are made by combining steel and plastic. They have the high strength of steel and the corrosion resistance of plastic and are widely used in gas, water, oil and other transportation systems. The production process of steel-plastic composite pipe fittings is generally to embed the steel skeleton into the plastic sleeve, and then use the injection molding machine to inject the molten plastic into the mold so that it is tightly combined with the steel skeleton to form a steel-plastic composite pipe fitting.

[0003] When producing steel-plastic composite pipe fittings, the steel skeleton needs to be accurately positioned to ensure that its position in the mold does not shift, thereby ensuring the quality and performance of the pipe fittings. At present, the traditional way of producing large-diameter steel-plastic composite pipe fittings in this industry is to position the steel skeleton by pressing multiple rows of plastic positioning pins into the punching holes on the outer circumference of the embedded steel skeleton, or to position the steel skeleton by adding convex blocks to the ports of the dynamic and static mold cavities and tightly positioning the embedded steel skeleton when the dynamic and static mold cavities are closed, or to position the steel skeleton by using plastic positioning pins on the parting surface.

[0004] However, these traditional positioning methods all have certain defects. For example, the method of using plastic positioning pins will increase the workload of employees for each piece due to the large number of positioning pins required, and the plastic positioning pins will soften and deform before the injection process of the pipe fitting is completed when subjected to a large injection pressure, which will eventually lead to the failure of the positioning of the embedded steel frame in the mold cavity; the method of adding bumps will inevitably leave corresponding grooves on the outer surface of the product, which need to be sealed after the pipe fitting is demolded, but because the large-diameter pipe fittings produced are large in both external dimensions and single unit weight, it is difficult to seal the grooves in the later stage, and it may also cause leakage accidents of the pipe fittings due to failure in sealing during the sealing process. Utility Model Content

[0005] The utility model aims to provide a steel-plastic composite positioning pin and a large-diameter steel-plastic composite electric fusion sleeve pipe fitting, which can effectively solve the positioning problem of the embedded steel skeleton in the manufacturing process of the large-diameter steel-plastic composite pipe fitting and improve the production efficiency and quality of the pipe fitting.

[0006] The above-mentioned optimized structure of the utility model is realized by the following technical scheme: a steel-plastic composite positioning pin, comprising a positioning pin body, the positioning pin body comprising an inner core fixing piece, which is detachably connected to a steel frame, and the inner core fixing piece is made of metal;

[0007] The positioning sleeve is compounded on the inner core fixing piece to realize the positioning of the steel frame in the production mold. The positioning sleeve is made of plastic material, and one end of the inner core fixing piece protrudes from the positioning sleeve.

[0008] In some embodiments, the inner core fixing member includes an assembly portion, which protrudes from the positioning sleeve and is detachably connected to the steel frame;

[0009] The supporting part is coaxially arranged on the assembling part.

[0010] In some embodiments, the positioning sleeve includes a positioning portion, which is sleeved on the support portion and can be plugged and matched with the positioning cavity of the production mold;

[0011] The bonding portion is sleeved at the connection between the assembling portion and the supporting portion.

[0012] In some embodiments, the inner core fixing member further includes a connecting portion coaxially disposed between the assembly portion and the supporting portion, and the connecting portion is embedded in the bonding portion.

[0013] In some embodiments, the assembly portion, the support portion, and the connecting portion are all cylinders, and the radius of the connecting portion is smaller than the radius of the assembly portion and the support portion.

[0014] In some embodiments, the positioning pin body further includes a hanging hole penetrating through the positioning pin body on a side away from the inner core fixing member.

[0015] In some embodiments, the inner core fixing member includes a screw rod that can be threadedly engaged with the steel frame and is disposed on a side of the inner core fixing member away from the positioning sleeve.

[0016] In some embodiments, the positioning sleeve further includes at least two annular grooves disposed on the bonding portion, and outer diameters of the plurality of annular grooves gradually increase in a direction from the inner core fixing member to the positioning sleeve.

[0017] A large-caliber steel-plastic composite electric fusion sleeve pipe fitting comprises a pipe fitting body, on which at least three positioning pin bodies are arranged, and a plurality of positioning pin bodies are arranged in a ring shape on the outer surface of the pipe fitting body.

[0018] In some embodiments, the pipe body includes a sleeve, the steel skeleton is embedded in the sleeve, the steel skeleton is detachably connected to a plurality of the positioning pin bodies, and the plurality of the positioning pin bodies are integrally injection molded with the sleeve.

[0019] In summary, the utility model has the following beneficial effects:

[0020] The utility model adopts a composite structure of metal and plastic, which can effectively resist the injection force exerted on the embedded steel frame during the production process of the pipe fittings, thereby ensuring the accurate positioning of the embedded steel frame, avoiding the phenomenon of displacement or deformation in the mold cavity, and improving the quality and performance of the pipe fittings; at the same time, it can reduce the number of required positioning pins, and through the connection method of screws and nuts, it can achieve a detachable connection with the steel frame, which facilitates the installation of the steel frame, improves production efficiency, and reduces the labor intensity of workers.

[0021] The utility model provides an annular groove structure at the end of the positioning pin, which increases the contact area with the pipe fitting after integral injection molding with the pipe fitting, thereby enhancing the bonding strength between the steel-plastic composite positioning pin and the pipe fitting, avoiding separation of the positioning pin and the pipe fitting, and improving the sealing and safety of the pipe fitting; and a lifting hole structure is provided on the positioning pin, which can realize convenient lifting of the pipe fitting, reduce the labor intensity of workers, and improve the efficiency of transportation and installation of the pipe fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a large-diameter steel-plastic composite electric fusion sleeve pipe fitting of the utility model;

[0023] Figure 2 It is a side view of the large-diameter steel-plastic composite electric fusion sleeve pipe fitting of the utility model;

[0024] Figure 3 It is a cross-sectional view of the utility model along the AA line;

[0025] Figure 4 It is an enlarged view of point B of the present utility model.

[0026] In the figure: 1. inner core fixing part; 11. assembly part; 12. support part; 13. connection part; 2. positioning sleeve; 21. positioning part; 22. bonding part; 23. annular groove; 3. lifting hole; 4. positioning pin body; 5. steel frame; 6. pipe body; 7. sleeve. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] refer to Figure 1-4A steel-plastic composite locating pin includes a locating pin body 4, the locating pin body 4 includes an inner core fixing part 1, which can be detachably connected to a steel skeleton 5, and the inner core fixing part 1 can be made of metal material, such as stainless steel, aluminum alloy, etc.; a locating sleeve 2 is compounded on the inner core fixing part 1, and the locating sleeve 2 can be made of plastic material, such as polyethylene, polypropylene, etc., and one end of the inner core fixing part 1 protrudes from the locating sleeve 2; the rear end structure of the locating sleeve 2 is consistent with the structure of the inner core fixing part 1 covered, and the outer diameter of the locating sleeve 2 is matched with the outer diameter size of the locating circular hole on the dynamic and static mold cavity parting surface of the large-diameter steel-plastic composite pipe fitting mold produced, thereby realizing the positioning of the steel skeleton 5 in the production mold; the inner core fixing part 1 and the locating sleeve 2 are compounded into a whole, thereby improving the overall strength of the locating pin body 4, so that the locating pin body 4 can effectively resist the injection force received during the production process of the pipe fitting, avoid the displacement of the locating pin body 4, thereby affecting the positioning effect of the large-diameter steel-plastic composite electric fusion sleeve pipe fitting, and ensuring the quality and performance of the pipe fitting.

[0029] The inner core fixing member 1 includes an assembly part 11 and a support part 12. The assembly part 11 protrudes from the positioning sleeve 2. The assembly part 11 can be cylindrical, and its outer surface is provided with threads to form a screw, which can be screwed with the nut on the outer surface of the steel skeleton 5 to achieve a detachable connection with the steel skeleton 5; at the same time, it is convenient to adjust the installation height of the positioning pin body 4 on the steel skeleton 5, thereby improving the positioning accuracy of the steel skeleton 5 in the production mold, and then improving the production quality of the pipe fittings. The support part 12 is coaxially arranged on the assembly part 11. The support part 12 can be cylindrical, and its radius can be greater than the radius of the assembly part 11, and is used to support the positioning sleeve 2.

[0030] The positioning sleeve 2 includes a positioning portion 21 and a bonding portion 22. The positioning portion 21 is sleeved on the supporting portion 12. The positioning portion 21 can be cylindrical, and its outer diameter matches the outer diameter of the positioning circular hole on the dynamic and static mold cavity parting surface of the large-diameter steel-plastic composite pipe fitting mold produced, and can be plugged and matched with the positioning cavity of the production mold to realize the positioning of the steel skeleton 5 in the mold; the bonding portion 22 is sleeved at the connection between the assembly portion 11 and the supporting portion 12. The bonding portion 22 can be cylindrical, and its outer diameter is greater than the outer diameters of the assembly portion 11 and the supporting portion 12, which is used to enhance the bonding strength between the positioning sleeve 2 and the inner core fixing member 1; the positioning sleeve 2 also includes at least two annular grooves 23, which are arranged on the bonding portion 22, and the outer diameters of the multiple annular grooves 23 gradually increase from the inner core fixing member 1 to the positioning sleeve 2, which is used to realize the integral injection molding of the positioning sleeve 2 and the pipe fitting, increase the contact area between the bonding portion 22 and the pipe fitting, and thus enhance the bonding strength between the positioning sleeve 2 and the pipe fitting.

[0031] The inner core fixing part 1 is made of metal and is connected to the steel frame 5 with threads; the positioning sleeve 2 can be a plastic layer on the outer surface, and the positioning sleeve 2 is made of the same material as the product. The positioning pin body 4 is arranged in a ring on the middle plane of the steel-plastic electric fusion sleeve pipe fitting, and matched with the production mold so that the freedom of the steel frame 5 in all directions in the pipe fitting is constrained, thereby achieving accurate positioning of the steel frame 5 in the production mold.

[0032] The inner core fixing part 1 also includes a connecting portion 13, which is coaxially arranged between the assembly part 11 and the support part 12, and the connecting portion 13 is embedded in the bonding part 22. The connecting portion 13 can be cylindrical, and the radius of the connecting portion 13 is smaller than the radius of the assembly part 11 and the support part 12, which can increase the contact area between the inner core fixing part 1 and the positioning sleeve 2, thereby enhancing the bonding strength between the inner core fixing part 1 and the positioning sleeve 2.

[0033] The positioning pin body 4 also includes a hoisting hole 3, which passes through the positioning pin body 4 and is arranged on a side away from the inner core fixing member 1, which can facilitate the hoisting of pipe fittings, reduce the labor intensity of workers, and improve the efficiency of transportation and installation of pipe fittings.

[0034] A large-diameter steel-plastic composite electric fusion sleeve pipe fitting includes a pipe fitting body 6, the pipe fitting body 6 includes a sleeve 7, a steel frame 5 is embedded in the sleeve 7, at least three positioning pin bodies 4 are detachably connected to the steel frame 5, and multiple positioning pin bodies 4 are ring-shaped and arranged on the outer surface of the steel frame 5; multiple positioning pin bodies 4 and the sleeve 7 are integrally injection-molded, which can achieve precise positioning of the pipe fitting during the injection molding process, and at the same time facilitate the subsequent lifting and improve the efficiency of transportation and installation.

[0035] The locating pin body 4 protruding on the center surface of the pipe body 6 provides a convenient and fast balanced lifting point for subsequent installation and lifting, which can ensure that the position of the pipe fitting and the center line of the steel-plastic composite pipe to be connected are highly consistent, which not only improves the installation efficiency, but also improves the connection quality of the entire pipeline.

[0036] The specific working principle is as follows:

[0037] First, screw the screw on the inner core fixing part 1 of the steel-plastic composite locating pin into the embedded steel frame 5 in the large-diameter pipe fitting to connect the steel-plastic composite locating pin to the steel frame 5. Three steel-plastic composite locating pins can be used, which are arranged in a ring shape at equal intervals on the steel frame 5. Of course, more or fewer steel-plastic composite locating pins can be used as needed, as long as stable positioning of the steel frame 5 can be achieved.

[0038] Then, the steel-plastic composite locating pin is placed together with the embedded steel frame 5 of the pipe fitting into the cavity of the pipe fitting mold, and the rear end cylindrical part of the locating sleeve 2 of the steel-plastic composite locating pin is placed into the corresponding locating semi-circular hole on the parting surface of the pipe fitting mold cavity, so that the last annular groove end face of the locating sleeve 2 fits with the locating surface on the pipe fitting mold, thereby realizing the positioning of the steel-plastic composite locating pin and the production mold.

[0039] Next, the pipe fitting mold is inserted and molded together so that the positioning semicircular holes on the dynamic and static mold cavity parting surfaces are clamped together with the rear cylinder on the steel-plastic composite positioning pin, so that the embedded steel skeleton 5 is accurately suspended in the correct position in the mold cavity after the mold is closed, thereby realizing the positioning of the steel skeleton 5 in the mold.

[0040] Finally, the dynamic and static mold cavities and the pipe mold core are heated and then produced according to the injection molding process. After the pipe is cooled under pressure, the mold is opened and ejected, and then the pipe is lifted out of the injection molding machine using the lifting hole 3 of the steel-plastic composite positioning pin retained on the outer surface of the pipe. At this point, the production of a large-diameter steel-plastic composite pipe is completed.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel-plastic composite positioning pin, characterized in that: It comprises a positioning pin body (4), wherein the positioning pin body (4) comprises an inner core fixing part (1), which is detachably connected to a steel frame (5), and the inner core fixing part (1) is made of metal; The positioning sleeve (2) is compounded on the inner core fixing part (1) to realize the positioning of the steel frame (5) in the production mold. The positioning sleeve (2) is made of plastic material, and one end of the inner core fixing part (1) protrudes from the positioning sleeve (2).

2. The steel-plastic composite positioning pin according to claim 1, characterized in that: The inner core fixing member (1) comprises an assembly portion (11) which protrudes from the positioning sleeve (2) and is detachably connected to the steel frame; The supporting portion (12) is coaxially arranged on the assembling portion (11).

3. The steel-plastic composite positioning pin according to claim 2, characterized in that: The positioning sleeve (2) comprises a positioning portion (21), which is sleeved on the support portion (12) and can be plugged into and matched with the positioning cavity of the production mold; The bonding portion (22) is sleeved at the connection between the assembly portion (11) and the support portion (12).

4. The steel-plastic composite positioning pin according to claim 3, characterized in that: The inner core fixing member (1) further comprises a connecting portion (13) coaxially arranged between the assembly portion (11) and the support portion (12), and the connecting portion (13) is embedded in the bonding portion (22).

5. The steel-plastic composite positioning pin according to claim 4, characterized in that: The assembly portion (11), the support portion (12) and the connection portion (13) are all cylinders, and the radius of the connection portion (13) is smaller than the radius of the assembly portion (11) and the support portion (12).

6. The steel-plastic composite positioning pin according to claim 1, characterized in that: The positioning pin body (4) further comprises a hanging hole (3) which passes through the positioning pin body (4) and is away from the inner core fixing member (1).

7. The steel-plastic composite positioning pin according to claim 1, characterized in that: The inner core fixing member (1) comprises a screw rod which can be threadedly engaged with the steel frame and is arranged on a side of the inner core fixing member (1) away from the positioning sleeve (2).

8. The steel-plastic composite positioning pin according to claim 3, characterized in that: The positioning sleeve (2) further comprises at least two annular grooves (23) arranged on the bonding portion (22).

9. A large-diameter steel-plastic composite electric fusion sleeve pipe fitting, using a steel-plastic composite positioning pin as claimed in any one of claims 1 to 8, characterized in that: It comprises a pipe body (6), on which at least three positioning pin bodies (4) are arranged, and the plurality of positioning pin bodies (4) are arranged in a ring shape on the outer surface of the pipe body (6).

10. A large-diameter steel-plastic composite electric fusion sleeve pipe fitting according to claim 9, characterized in that: The pipe fitting body (6) comprises a sleeve (7), the sleeve (7) having the steel frame (5) embedded therein, the steel frame (5) being detachably connected to a plurality of the positioning pin bodies (4), and the plurality of the positioning pin bodies (4) and the sleeve (7) being integrally injection-molded.

Images