Composite flange

Abstract

The application provides a composite flange, which belongs to the technical field of flanges and comprises a metal flange plate, a plurality of groups of positioning sleeves and a plastic cladding layer. The metal flange plate is provided with a plurality of connecting holes at intervals in the circumferential direction. The plurality of groups of positioning sleeves correspond to the connecting holes one by one. Each group of positioning sleeves is in plug-in cooperation with the corresponding connecting hole, and the length of each group of positioning sleeves in the connecting hole is the same as the depth of the connecting hole. The outer side of each group of positioning sleeves is connected with a first positioning ring, and the first positioning ring is in contact with the end of the metal flange plate. The two ends of the metal flange plate are provided with first positioning rings, and the first positioning rings at the two ends of the metal flange plate are respectively used for being in contact with the two ends of the injection cavity of the injection mold. The plastic cladding layer is cladded on the outer side of the metal flange plate. The end surface of the plastic cladding layer is coplanar with the end surface of the first positioning ring. The application can improve the consistency of the thickness of the plastic and reduce the exposure of the metal flange plate.

Description

Technical Field

[0001] This application belongs to the field of flange technology, specifically relating to a composite flange. Background Technology

[0002] Flanges are key components for pipeline connections. Existing flange technologies include steel flanges and injection-molded flanges. Steel flanges have good mechanical strength and are therefore widely used; however, steel flanges have poor corrosion resistance. When used in corrosive media environments, steel flanges are easily corroded, affecting the stability and safety of the pipeline system. Injection-molded flanges have poor mechanical strength and are prone to deformation and cracking when subjected to large pressures or impacts, failing to meet the high strength requirements of industrial pipeline connections.

[0003] In the prior art, in order to improve the corrosion resistance of steel flanges, powder coating or rotational molding is applied to the surface of the steel flange. However, powder coating or rotational molding methods are prone to uneven thickness of the plastic coating at both ends of the steel flange. Utility Model Content

[0004] This application provides a composite flange, which aims to solve the problem that the processing methods in the prior art are prone to produce uneven plastic coating thickness at both ends of the steel flange.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A composite flange is provided, comprising: A metal flange with several connection holes spaced around its circumference; Several sets of positioning sleeves correspond one-to-one with the connecting holes; each set of positioning sleeves is inserted into the corresponding connecting hole, and the length of each set of positioning sleeves inside the connecting hole is the same as the depth of the connecting hole; a first positioning ring is connected to the outer side of each set of positioning sleeves, and the first positioning ring contacts the end of the metal flange; both ends of the metal flange have first positioning rings, and the first positioning rings at both ends of the metal flange are respectively used to contact the two ends of the injection cavity of the injection mold. A plastic sheathing layer covers the outside of the metal flange; the end face of the plastic sheathing layer is coplanar with the end face of the first positioning ring.

[0006] In one possible implementation, each set of positioning sleeves is a positioning sleeve, the first positioning ring is fixed to one end of the positioning sleeve, the other end of the positioning sleeve is a plug-in end, and the length between the first positioning ring and the plug-in end is the same as the depth of the connecting hole. The metal flange has a first end and a second end at its two ends, respectively. A portion of the positioning sleeve is inserted into the first end of the metal flange, and the other portion of the positioning sleeve is inserted into the second end of the metal flange.

[0007] In one possible implementation, each set of positioning sleeves consists of two positioning sleeves, with the first positioning ring fixed to one end of the positioning sleeve and the other end of the positioning sleeve being a plug-in end. In each group, the two positioning sleeves are located on both sides of the metal flange, and the two positioning sleeves in each group are inserted into the same connecting hole; the first positioning rings of the two positioning sleeves are in contact with both ends of the metal flange.

[0008] In one possible implementation, the distance between the first positioning ring of the positioning sleeve and the insertion end is the insertion depth, and the insertion depths of the two positioning sleeves in the same group are the same or different. When the two positioning sleeves are inserted into place, the insertion ends of the two positioning sleeves are in contact with each other.

[0009] In one possible implementation, the insertion end of one of the positioning sleeves in the same group has a stepped surface, and the outer peripheral wall of the stepped surface has an external thread; the insertion end of the other positioning sleeve in the same group has a stepped hole, and the inner peripheral wall of the stepped hole has an internal thread; wherein the two positioning sleeves in the same group are threadedly engaged.

[0010] In one possible implementation, a second positioning ring is connected to the outer side of the first positioning ring, and the outer diameter of the second positioning ring is smaller than the outer diameter of the first positioning ring.

[0011] In one possible implementation, the second positioning ring is integrally formed with the first positioning ring, or the second positioning ring is spliced ​​with the first positioning ring.

[0012] In one possible implementation, when the second positioning ring and the first positioning ring are spliced ​​together, the second positioning ring and the first positioning ring are plugged in or threaded together.

[0013] In one possible implementation, both the end face and the outer peripheral wall of the plastic coating layer have textures.

[0014] In one possible implementation, the end face of the plastic coating layer has at least one marked location.

[0015] This application provides a composite flange. Compared with the prior art, during the production process, each set of positioning sleeves is inserted into the corresponding connection hole, and the first positioning ring contacts the end face of the metal flange. The metal flange is placed in the injection mold, and the positioning sleeves are inserted into the insertion pins in the injection mold. After the injection mold is closed, the first positioning rings at both ends of the metal flange contact the two ends of the injection cavity, respectively. At this time, the end face and outer peripheral wall of the metal flange do not contact the injection cavity. After injection molding, a plastic coating layer is formed on the outside of the metal flange, and the thickness of the plastic coating layer is relatively uniform, which can avoid the situation where the metal flange is partially exposed due to incomplete coating. Through the above-mentioned settings of this application, the consistency of the plastic thickness at both ends of the metal flange can be improved, and the situation where the metal flange is exposed can be reduced. Attached Figure Description

[0016] Figure 1 A schematic diagram of a composite flange provided for an embodiment of this application; Figure 2 A cross-sectional view of a composite flange provided in an embodiment of this application; Figure 3 for Figure 2 Enlarged diagram of section A in the middle; Figure 4 A schematic diagram of the metal flange portion of a composite flange provided in an embodiment of this application; Figure 5 A front view of the metal flange portion of a composite flange provided in an embodiment of this application; Figure 6 A schematic diagram of the insert portion of a composite flange provided in an embodiment of this application; Figure 7 A schematic diagram illustrating the threaded engagement between the second locating ring and the locating sleeve of a composite flange, as provided in an embodiment of this application. Figure 8 A schematic diagram showing the contact between the insertion ends of two positioning sleeves of a composite flange provided in an embodiment of this application; Figure 9 This is a schematic diagram of the threaded fit between two positioning sleeves of a composite flange provided in an embodiment of this application.

[0017] Explanation of reference numerals in the attached drawings: 1. Metal flange; 11. Connection hole; 2. Positioning sleeve; 21. First positioning ring; 22. Second positioning ring; 23. Insert block; 3. Plastic covering layer. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0019] Please refer to the following: Figures 1 to 9 The present application will now describe a composite flange. The composite flange includes a metal flange 1, several sets of positioning sleeves 2, and a plastic covering layer 3. The metal flange 1 has several connecting holes 11 spaced apart circumferentially. The several sets of positioning sleeves 2 correspond one-to-one with the connecting holes 11. Each set of positioning sleeves 2 is inserted into the corresponding connecting hole 11, and the length of each set of positioning sleeves 2 inside the connecting hole 11 is the same as the depth of the connecting hole 11. A first positioning ring 21 is connected to the outer side of each set of positioning sleeves 2, and the first positioning ring 21 contacts the end of the metal flange 1. Both ends of the metal flange 1 have first positioning rings 21, which are used to contact the two ends of the injection cavity of the injection mold, respectively. The plastic covering layer 3 covers the outer side of the metal flange 1. The end face of the plastic covering layer 3 is coplanar with the end face of the first positioning ring 21. The end face and outer peripheral wall of the plastic covering layer 3 are textured. The end face of the plastic covering layer 3 has at least one marking position, and a marking can be set at the marking position according to actual needs.

[0020] This application provides a composite flange. Compared with the prior art, during the production process of the composite flange, each set of positioning sleeves 2 is inserted and matched with the corresponding connecting hole 11, and the first positioning ring 21 contacts the end face of the metal flange 1. The metal flange 1 is placed in the injection mold, and the positioning sleeves 2 are inserted and matched with the inserts in the injection mold, which can support and limit the position of the metal flange 1. After the injection mold is closed, the first positioning rings 21 at both ends of the metal flange 1 contact the two ends of the injection cavity, respectively. At this time, the end face and outer peripheral wall of the metal flange 1 do not contact the injection cavity. After injection molding, a plastic coating layer 3 is formed on the outside of the metal flange 1, and the thickness of the plastic coating layer 3 is relatively uniform, which can avoid the situation where the coating is not in place and part of the metal flange 1 is exposed. Through the above-mentioned settings of this application, the consistency of the plastic thickness at both ends of the metal flange can be improved, and the situation where the metal flange 1 is exposed can be reduced.

[0021] In some embodiments, such as Figures 1 to 9As shown, each set of positioning sleeves 2 is a positioning sleeve 2, with a first positioning ring 21 fixed at one end of the positioning sleeve 2 and the other end of the positioning sleeve 2 being an insertion end. The length between the first positioning ring 21 and the insertion end is the same as the depth of the connecting hole 11. The two ends of the metal flange 1 are the first end and the second end, respectively. A portion of the positioning sleeve 2 is inserted into the first end of the metal flange 1, and the other portion of the positioning sleeve 2 is inserted into the second end of the metal flange 1.

[0022] In this embodiment, each set of positioning sleeves 2 is one. The length of the insertion end of the positioning sleeve 2 is the same as the depth of the connecting hole 11. Therefore, after the positioning sleeve 2 is inserted and fitted into the connecting hole 11, the insertion end of the positioning sleeve 2 and the connecting hole 11 are coplanar at the other end of the metal flange 1. The insertion end of the positioning sleeve 2 can protect the connecting hole 11 of the metal flange 1. After injection molding, the plastic covering layer 3 can wrap around the metal flange 1. The through hole of the positioning sleeve 2 serves as a connection channel for bolts to pass through.

[0023] Since the length of the insertion end of the positioning sleeve 2 is the same as the depth of the connecting hole 11, all sets of positioning sleeves 2 cannot be inserted from one side of the metal flange 1, otherwise the other side of the metal flange 1 cannot be positioned.

[0024] Several sets of positioning sleeves 2 are divided into two parts, one part is inserted from the first end of the metal flange 1, and the other part is inserted from the second end of the metal flange 1. With the above arrangement, both ends of the metal flange 1 have a first positioning ring 21. After the mold is closed, the first positioning rings 21 at both ends of the metal flange 1 can play a positioning role.

[0025] In some embodiments, such as Figures 1 to 9 As shown, a second positioning ring 22 is connected to the outer side of the first positioning ring 21. The outer diameter of the second positioning ring 22 is smaller than the outer diameter of the first positioning ring 21; the inner diameter of the second positioning ring 22 is equal to the inner diameter of the positioning sleeve 2.

[0026] It should be noted that by setting a second positioning ring 22 on the outside of the first positioning ring 21, and the inner diameter of the second positioning ring 22 being equal to the inner diameter of the positioning sleeve 2, the diameter of the connection channel on the composite flange remains consistent after injection molding. The outer diameter of the second positioning ring 22 is smaller than the outer diameter of the first positioning ring 21, so the position between the first positioning ring 21 and the second positioning ring 22 will be covered by the plastic covering layer 3, and the first positioning ring 21 will be completely located within the plastic covering layer 3, thereby enhancing the connection between the positioning sleeve 2 and the covering layer.

[0027] The connection between the second positioning ring 22 and the first positioning ring 21 can be integrally formed or spliced. When the second positioning ring 22 and the first positioning ring 21 are spliced, the second positioning ring 22 and the first positioning ring 21 are connected by insertion or thread.

[0028] Specifically, when the second positioning ring 22 is inserted into the first positioning ring 21, the first positioning ring 21 is provided with an insertion hole, and the second positioning ring 22 is provided with an insertion block 23, which protrudes out of the outer side of the second positioning ring 22. After injection molding, the insertion block 23 is covered in the plastic covering layer 3, which can improve the connection between the second positioning ring 22 and the plastic covering layer 3.

[0029] Specifically, when the first positioning ring 21 and the second positioning ring 22 are threaded together, the first positioning ring 21 has a threaded hole and the second positioning ring 22 has an external thread. The second positioning ring 22 is fixed to the first positioning ring 21 by the thread.

[0030] In addition, the inner diameter of the second positioning ring 22 can also be larger than the inner diameter of the positioning sleeve 2. After injection molding is completed, a countersunk hole is formed between the second positioning ring 22 and the first positioning ring 21.

[0031] In some embodiments, such as Figures 1 to 9 As shown, each set of positioning sleeves 2 consists of two positioning sleeves 2, with a first positioning ring 21 fixed at one end of the positioning sleeve 2 and the other end of the positioning sleeve 2 being an insertion end; wherein, the two positioning sleeves 2 of each set are located on both sides of the metal flange 1, and the two positioning sleeves 2 of each set are inserted into the same connection hole 11; the first positioning rings 21 of the two positioning sleeves 2 are in contact with both ends of the metal flange 1 respectively.

[0032] In this embodiment, each set of positioning sleeves 2 consists of two sleeves. A first positioning ring 21 is fixedly provided on the outer side of each positioning sleeve 2, and the inner side of each positioning sleeve 2 is inserted into the same connecting hole 11. After the two positioning sleeves 2 are inserted into place, they can protect the connecting hole 11. During the insertion process, the two positioning sleeves 2 are inserted from both ends of the connecting hole 11, so that both ends of the metal flange 1 have the first positioning ring 21. After the metal flange 1 is placed on the mold, it is convenient to limit the end of the metal flange 1.

[0033] In some embodiments, such as Figures 1 to 9 As shown, the distance between the first positioning ring 21 of the positioning sleeve 2 and the insertion end is the insertion depth. The insertion depths of the two positioning sleeves 2 in the same group are the same or different. When the two positioning sleeves 2 are inserted into place, the insertion ends of the two positioning sleeves 2 are in contact with each other.

[0034] It should be noted that the outer peripheral wall of the positioning sleeve 2 contacts the inner peripheral wall of the connecting hole 11, and the insertion ends of the two positioning sleeves 2 contact each other after they are inserted into place; the insertion ends of the two positioning sleeves 2 in the same group can be the same or different, as long as the insertion ends of the two positioning sleeves 2 in the same group can contact each other; preferably, the insertion ends of the two positioning sleeves 2 in the same group are the same length, which is convenient for mass production.

[0035] In some embodiments, such as Figures 1 to 9 As shown, the insertion end of one of the positioning sleeves 2 in the same group has a stepped surface, and the outer peripheral wall of the stepped surface has an external thread; the insertion end of the other positioning sleeve 2 in the same group has a stepped hole, and the inner peripheral wall of the stepped hole has an internal thread; wherein, the two positioning sleeves 2 in the same group are threadedly engaged.

[0036] In this embodiment, the two positioning sleeves 2 are fixed by a threaded connection. After the two positioning sleeves 2 are inserted into the connecting hole 11, the two positioning sleeves 2 rotate relative to each other and can be connected together by the thread.

[0037] Taking the second positioning ring 22 set on the positioning sleeve 2 as an example, after the metal flange 1 is placed in the mold, the second positioning ring 22 at both ends of the metal flange 1 can contact the two ends of the injection cavity respectively, thereby playing a limiting role.

[0038] It should be noted that the positioning sleeve 2, the first positioning ring 21 and the second positioning ring 22 in this application are all made of corrosion-resistant materials, such as polypropylene, but are not limited to polypropylene and may also be other corrosion-resistant materials; the plastic coating layer 3 in this application takes polypropylene as an example, but is not limited to polypropylene and may also be other corrosion-resistant plastics.

[0039] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A composite flange, characterized in that, include: A metal flange with several connection holes spaced around its circumference; Several sets of positioning sleeves correspond one-to-one with the connecting holes; each set of positioning sleeves is inserted into the corresponding connecting hole, and the length of each set of positioning sleeves inside the connecting hole is the same as the depth of the connecting hole; a first positioning ring is connected to the outer side of each set of positioning sleeves, and the first positioning ring contacts the end of the metal flange; both ends of the metal flange have first positioning rings, and the first positioning rings at both ends of the metal flange are respectively used to contact the two ends of the injection cavity of the injection mold. A plastic sheathing layer covers the outside of the metal flange; the end face of the plastic sheathing layer is coplanar with the end face of the first positioning ring.

2. The composite flange as described in claim 1, characterized in that, Each set of positioning sleeves is a positioning sleeve, the first positioning ring is fixed at one end of the positioning sleeve, and the other end of the positioning sleeve is a plug-in end. The length between the first positioning ring and the plug-in end is the same as the depth of the connecting hole. The metal flange has a first end and a second end at its two ends, respectively. A portion of the positioning sleeve is inserted into the first end of the metal flange, and the other portion of the positioning sleeve is inserted into the second end of the metal flange.

3. A composite flange as described in claim 1, characterized in that, Each set of positioning sleeves consists of two positioning sleeves, with the first positioning ring fixed at one end of the positioning sleeve and the other end of the positioning sleeve being a plug-in end; In each group, the two positioning sleeves are located on both sides of the metal flange, and the two positioning sleeves in each group are inserted into the same connecting hole; the first positioning rings of the two positioning sleeves are in contact with both ends of the metal flange.

4. A composite flange as described in claim 3, characterized in that, The distance between the first positioning ring of the positioning sleeve and the insertion end is the insertion depth. The insertion depths of the two positioning sleeves in the same group may be the same or different. When the two positioning sleeves are inserted into place, the insertion ends of the two positioning sleeves are in contact with each other.

5. A composite flange as described in claim 3, characterized in that, One of the positioning sleeves in the same group has a stepped surface at its insertion end, and the outer peripheral wall of the stepped surface has an external thread; the other positioning sleeve in the same group has a stepped hole at its insertion end, and the inner peripheral wall of the stepped hole has an internal thread; wherein, the two positioning sleeves in the same group are threadedly engaged.

6. A composite flange as described in claim 1, characterized in that, A second positioning ring is connected to the outside of the first positioning ring, and the outer diameter of the second positioning ring is smaller than the outer diameter of the first positioning ring.

7. A composite flange as described in claim 6, characterized in that, The second positioning ring is integrally formed with the first positioning ring, or the second positioning ring is spliced ​​with the first positioning ring.

8. A composite flange as described in claim 7, characterized in that, When the second positioning ring and the first positioning ring are spliced ​​together, the second positioning ring and the first positioning ring are plugged in or threaded together.

9. A composite flange as described in claim 1, characterized in that, The end face and outer peripheral wall of the plastic coating layer are textured.

10. A composite flange as described in claim 1, characterized in that, The end face of the plastic coating layer has at least one marked position.

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