Steel wire mesh reinforced polypropylene composite pipe for coal mine

Abstract

The utility model relates to the technical field of coal mining, in particular to a steel wire mesh reinforced polypropylene composite pipe for a coal mine, which comprises pipe bodies, an outer clamp and an inner core, wherein the outer clamp and the inner core are used for connecting ports of any two pipe bodies; the pipe body comprises a polypropylene outer layer, a hot melt adhesive layer, a winding steel wire mesh layer, a hot melt adhesive layer and a polypropylene inner layer which are sequentially arranged from outside to inside. When the steel wire mesh reinforced polypropylene composite pipe for the coal mine is applied in practical application, compared with a composite pipe made of a polyethylene material, the composite pipe made of the polypropylene material not only has the advantages of flame retardance and static electricity resistance, but also has the advantage of good straightness; and the outer clamp and the inner core are matched for use and are used for fastening and sealing connection of the ports of the two pipe bodies, so that effective fastening and sealing of the to-be-connected pipe bodies can be achieved, repeated use of the outer clamp and the inner core can be achieved, and the inner diameters of the pipe bodies cannot be affected.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine exploitation, in particular to a steel wire mesh reinforced polypropylene composite pipe for coal mines. Background Art

[0002] At present, the matrix of the steel wire mesh skeleton composite pipe for coal mines is mostly made of polyethylene. When connecting the ports of two composite pipes made of polyethylene, the connection is usually carried out by means of a clamped collar, a clamped flange, an electrofusion flange or a socket flange. When using such methods for tight sealing connection, the ports of the composite pipes usually need to be sealed. One specific method is to use a sealing ring for sealing, and the other is to turn the edge of the pipe so that the pipe end face does not contact the medium, so as to prevent the flowing medium in the composite pipe from corroding the steel wire of the composite pipe through the connection end face, resulting in the pressure-bearing failure of the composite pipe. At the same time, based on the clamped collar and the clamped flange with auxiliary iron sheets to connect the ports of two composite pipes, after clamping and fastening, the size of the iron sheet will shrink, resulting in non-reusability. In addition, in actual application, in order to ensure the tight sealing effect, excessive extrusion is usually carried out, thereby reducing the inner diameter of the pipe body of the composite pipe; for the connection methods of electrofusion flange or socket flange, since both the electrofusion flange and the socket flange are made of PE material, they are usually melted together with the composite pipe during connection and cannot be removed without damaging their structures, resulting in non-reusability.

[0003] Therefore, there is an urgent need for a steel wire mesh reinforced polypropylene composite pipe for coal mines to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problems that the existing composite pipes made of polyethylene for coal mines have poor straightness, need to be sealed before connecting the ports with connectors, and the connectors cannot be reused, and also affect the flow inner diameter of the composite pipes, and provide a steel wire mesh reinforced polypropylene composite pipe for coal mines.

[0005] The technical solution of the utility model is as follows:

[0006] A steel wire mesh reinforced polypropylene composite pipe for coal mines, comprising a pipe body, an outer clamp and an inner core for connecting the ports of any two said pipe bodies. The pipe body comprises a polypropylene outer layer, a hot melt adhesive layer, a wound steel wire mesh layer, a hot melt adhesive layer and a polypropylene inner layer which are arranged in sequence from outside to inside.

[0007] Preferably, the outer clamp comprises two semi-circular collars and bolts for connecting the two semi-circular collars. The inner surface of the semi-circular collar in contact with the polypropylene outer layer of the pipe body is provided with an inner card slot with an M-shaped cross section.

[0008] Preferably, the inner core is circular, and an outer surface of the circular inner core that contacts the polypropylene inner layer of the pipe body is provided with an outer card slot that matches the structure of the inner card slot and is used to snap-connect the ports of the two pipe bodies into an M-shaped cross-section.

[0009] Preferably, the outer surface of the inner core that contacts the polypropylene inner layer of the pipe body is further provided with a sealing groove, and a sealing ring is arranged in the sealing groove.

[0010] Preferably, the sealing ring is a rubber sealing ring.

[0011] Preferably, a flaring die is further included, which is used to flare the ports of the pipe body.

[0012] Preferably, both ends of the semi-circular clamp are provided with ear plates, and threaded holes for bolt connection are provided on the ear plates.

[0013] Preferably, the inner surface of the inner core is a smooth surface.

[0014] Preferably, the inner diameter of the inner core is the same as the inner diameter of the pipe body.

[0015] Preferably, both the outer clamp and the inner core are made of stainless steel or cast iron.

[0016] According to the above technical solution, based on this wire mesh reinforced polypropylene composite pipe for coal mines, during actual application, by designing a composite pipe made of polypropylene material, compared with a composite pipe made of polyethylene material, it not only has the advantages of flame retardancy and antistatic property, but also has the advantage of good straightness, thereby reducing the use length during pipe laying; and by using the outer clamp and the inner core in cooperation to tightly seal and connect the ports of the two pipe bodies, it can not only effectively tightly seal the pipe bodies to be connected, but also enable the repeated use of the outer clamp and the inner core and will not affect the inner diameter of the pipe body, nor is it necessary to seal the pipe ports. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic cross-sectional structure diagram of a wire mesh reinforced polypropylene composite pipe for coal mines;

[0018] Figure 2 is a schematic cross-sectional structure diagram of the pipe body of the wire mesh reinforced polypropylene composite pipe for coal mines when magnified based on point A;

[0019] Figure 3 is a schematic structure diagram of the outer clamp of the wire mesh reinforced polypropylene composite pipe for coal mines;

[0020] Figure 4 is Figure 3 a schematic cross-sectional structure diagram when the two semi-circular clamps of the shown outer clamp are assembled;

[0021] Figure 5 It is a schematic structural view of the inner core of a steel wire mesh reinforced polypropylene composite pipe for coal mines;

[0022] Figure 6 It is a schematic cross-sectional structural view of the inner core;

[0023] Figure 7 It is a schematic cross-sectional structural view of the pipe body after flaring by a flaring die and the flaring die.

[0024] Explanation of reference numerals

[0025] 1. Pipe body; 2. Outer clamp; 21. Semi-circular clamp; 211. Inner clamping groove; 22. Bolt; 3. Inner core; 31. Outer clamping groove; 32. Sealing groove; 4. Sealing ring; 5. Polypropylene outer layer; 6. Hot melt adhesive layer; 7. Wound steel wire mesh layer; 8. Polypropylene inner layer; 9. Flaring die. Specific embodiments

[0026] The following details the specific embodiments of the embodiments of the present invention. It should be understood that the specific embodiments described herein are only for explaining and illustrating the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0027] The present invention provides a steel wire mesh reinforced polypropylene composite pipe for coal mines, as Figure 1-7 shown, the steel wire mesh reinforced polypropylene composite pipe for coal mines includes a pipe body 1, an outer clamp 2 and an inner core 3 for connecting the ports of any two of the pipe bodies 1. The pipe body 1 includes a polypropylene outer layer 5, a hot melt adhesive layer 6, a wound steel wire mesh layer 7, a hot melt adhesive layer 6 and a polypropylene inner layer 8 arranged in sequence from outside to inside.

[0028] According to the above technical solution, based on the steel wire mesh reinforced polypropylene composite pipe for coal mines, in actual application, by designing a composite pipe made of polypropylene material, compared with a composite pipe made of polyethylene material, it not only has the advantages of flame retardancy and antistatic property, but also has the advantage of good straightness, thereby reducing the use length during pipe laying; and by using the outer clamp and the inner core in cooperation to tightly seal and connect the ports of the two pipe bodies, not only can the effective tight sealing of the pipe bodies to be connected be realized, but also the repeated use of the outer clamp and the inner core can be realized and the inner diameter of the pipe body will not be affected, and there is no need to seal the pipe body ports.

[0029] In the steel wire mesh reinforced polypropylene composite pipe of the present invention, preferably, as Figure 3-4 shown, the outer clamp 2 includes two semi-circular clamps 21 and a bolt 22 for connecting the two semi-circular clamps 21. The inner surface of the semi-circular clamp 21 in contact with the polypropylene outer layer 5 of the pipe body 1 is provided with an inner clamping groove 211 with an M-shaped cross-section.

[0030] As Figure 5-6 shown, the inner core 3 is circular, and an outer groove 31 that matches the structure of the inner groove 211 is provided on the outer surface of the circular inner core 3 that contacts the polypropylene inner layer 8 of the pipe body 1, for clamping the ports of the two pipe bodies 1 into an M-shaped cross-section.

[0031] In practical applications, by designing the two semi-circular clamps 21 based on bolt fixation, while achieving the tight connection of the ports of the two pipe bodies 1, the reuse of the outer clamp 2 can be realized based on detachable installation. Further, by providing an inner groove 211 with an M-shaped cross-section on the inner surface of the semi-circular clamp 21 that contacts the polypropylene outer layer 5 of the pipe body 1, and an outer groove 31 that matches the structure of the inner groove 211 on the outer surface of the circular inner core 3 that contacts the polypropylene inner layer 8 of the pipe body 1, not only can the tight connection of the ports of the two pipe bodies 1 be further realized, but also the flowing medium in the pipe body 1 can be made not to contact the end face of the pipe body 1 based on the inner core 3, and thus there is no longer a need to seal the ports of the pipe body 1; further, based on the matching of the inner groove 211 on the semi-circular clamp 21 of the outer clamp 2 and the outer groove 31 on the inner core 3, when the two semi-circular clamps 21 are fixed by the bolts 22, the inner core 3 can support to avoid the reduction of the flow inner diameter of the pipe body 1 caused by excessive extrusion; further, based on the clamping of the ports of the pipe body 1 by the inner groove 211 and the outer groove 31, the axial pull-out resistance of the pipe body can also be improved.

[0032] Among them, in order to improve the structural strength of the inner core 3 and be able to clamp the pipe body 1 into an M shape under the action of the bolts 22, in a preferred embodiment, both the outer clamp 2 and the inner core 3 are made of stainless steel or cast iron. And in order to realize the detachable connection between the two semi-circular clamps 21 and the bolts 22, in a specific embodiment, ear plates are provided at both ends of the semi-circular clamp 21, and threaded holes for connecting the bolts 22 are provided on the ear plates.

[0033] In the wire mesh reinforced polypropylene composite pipe for coal mines of the present utility model, as Figure 1 and 6 shown, in order to further improve the sealing performance when the outer clamp 2 and the inner core 3 tightly connect the ports of the two pipe bodies 1 and avoid the contact between the end face of the pipe body 1 and the medium in the pipe body 1, preferably, a sealing groove 32 is further provided on the outer surface of the inner core 3 that contacts the polypropylene inner layer 8 of the pipe body 1. Preferably, two are provided as shown in Figure 1 shown, and a sealing ring 4 is provided in the sealing groove 32. Specifically, the sealing ring 4 is a rubber sealing ring.

[0034] In the steel wire mesh-reinforced polypropylene composite pipe for coal mines of the present utility model, in order to further improve the convenience when connecting the ports of the two pipe bodies 1 based on the outer clamp 2 and the inner core 3, preferably, it further includes a flaring die 9 for flaring the ports of the pipe bodies 1. Specifically, the flaring end of the flaring die 9 is inserted into the port of the pipe body 1 with a length twice the length of the hypotenuse cross-section of the card slot of the inner card slot 211, and the port of the pipe body 1 is centered and flared into the shape as Figure 7 shown. Then, when connecting, first install the inner core 3 inside the connecting ports of the two pipe bodies 1, and then squeeze the pipe bodies 1 by tightening the bolts 22 to achieve the sealed and fastened connection of the ports of the two pipe bodies 1.

[0035] In the steel wire mesh-reinforced polypropylene composite pipe for coal mines of the present utility model, preferably, the inner surface of the inner core 3 is a smooth surface, and the inner diameter of the inner core 3 is the same as the inner diameter of the pipe body 1, so as to avoid the influence of the setting of the inner core 3 on the medium flow inside the pipe body 1.

[0036] The present utility model will be described in detail below through embodiments, but the protection scope of the present utility model is not limited thereto.

[0037] Embodiment 1

[0038] Implemented using the steel wire mesh-reinforced polypropylene composite pipe for coal mines as Figure 1-7 shown. Specifically, the steel wire mesh-reinforced polypropylene composite pipe for coal mines includes a pipe body 1, an outer clamp 2 and an inner core 3 for connecting the ports of any two pipe bodies 1. The pipe body 1 includes a polypropylene outer layer 5, a hot melt adhesive layer 6, a wound steel wire mesh layer 7, a hot melt adhesive layer 6 and a polypropylene inner layer 8 arranged in sequence from outside to inside;

[0039] The outer clamp 2 includes two semi-circular clamps 21 and a bolt 22 for connecting the two semi-circular clamps 21. The inner surface of the semi-circular clamp 21 in contact with the polypropylene outer layer 5 of the pipe body 1 is provided with an inner card slot 211 with an M-shaped cross-section; the inner core 3 is circular, and the outer surface of the circular inner core 3 in contact with the polypropylene inner layer 8 of the pipe body 1 is provided with an outer card slot 31 that matches the structure of the inner card slot 211 for clamping the ports of the two pipe bodies 1 into an M-shaped cross-section; both ends of the semi-circular clamp 21 are provided with ear plates, and threaded holes for connecting the bolts 22 are opened on the ear plates; the inner surface of the inner core 3 is a smooth surface; the inner diameter of the inner core 3 is the same as the inner diameter of the pipe body 1; both the outer clamp 2 and the inner core 3 are made of cast iron.

[0040] In actual application, as Figure 1As shown in the figure, first, a flaring tool is used to expand the port cross-section of the two pipe bodies 1 to be connected into an inverted V shape. Then, the inner core 3 is installed inside the ports of the two pipe bodies 1 to be connected. Next, the two semi-circular clamps 21 are correspondingly installed outside the ports of the two pipe bodies 1 to complete the relative setting of the inner card slots 211 and the outer card slots 31. Finally, the bolts 22 are tightened to realize the connection of the ports of the two pipe bodies to be connected.

[0041] After testing, for the steel wire mesh reinforced polypropylene composite pipe for coal mines described in the present utility model, compared with the existing technical solutions, by using a pipe body made of polypropylene material, the straightness of the pipe body is improved, thereby reducing the use length during laying. And by isolating the pipe body end face from the medium inside the pipe body based on the inner core, it is no longer necessary to seal the pipe body port. Moreover, based on the supporting effect of the inner core, it is possible to avoid reducing the flow inner diameter of the pipe body during fastening. And based on the matching and detachable setting of the outer clamp and the inner core, the fastening and sealing components can also be reused.

[0042] Embodiment 2

[0043] Implemented with reference to Embodiment 1, the difference is that a sealing groove 32 is also provided on the outer surface of the inner core 3 in contact with the polypropylene inner layer 8 of the pipe body 1, and a sealing ring 4 is arranged in the sealing groove 32; the sealing ring 4 is a rubber sealing ring.

[0044] After testing, for the steel wire mesh reinforced polypropylene composite pipe for coal mines described in the present utility model, compared with the solution in Embodiment 1, the sealing performance when connecting the ports of the two pipe bodies can be further improved.

[0045] Embodiment 3

[0046] Implemented with reference to Embodiment 2, the difference is that it further includes a flaring die 9 for flaring the ports of the pipe body 1.

[0047] After testing, for the steel wire mesh reinforced polypropylene composite pipe for coal mines described in the present utility model, compared with the solution in Embodiment 2, the efficiency of sealing and connecting the ports of the two pipe bodies can be further improved.

[0048] The steel wire mesh reinforced polypropylene composite pipe for coal mines provided by the present utility model, by designing a composite pipe made of polypropylene material, compared with a composite pipe made of polyethylene material, not only has the advantages of flame retardancy and antistatic property, but also has good straightness, thereby reducing the use length of the pipe during laying. And by using an outer clamp and an inner core in combination to fasten and seal the ports of the two pipe bodies, not only can the effective fastening and sealing of the pipe bodies to be connected be realized, but also the reuse of the outer clamp and the inner core can be achieved without affecting the inner diameter of the pipe body, and there is no need to seal the pipe body port.

[0049] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited thereto. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solutions of the present utility model. To avoid unnecessary repetition, the present utility model will not separately describe various possible combinations. However, these simple modifications and combinations should also be regarded as the content disclosed by the present utility model and all fall within the protection scope of the present utility model.

Claims

1. A wire mesh reinforced polypropylene composite pipe for coal mines, characterized in that, The steel wire mesh reinforced polypropylene composite pipe for coal mines includes a pipe body (1), an outer clamp (2) and an inner core (3) for connecting the ports of any two said pipe bodies (1). The pipe body (1) includes a polypropylene outer layer (5), a hot melt adhesive layer (6), a wound steel wire mesh layer (7), a hot melt adhesive layer (6) and a polypropylene inner layer (8) which are arranged in sequence from outside to inside.

2. The wire mesh reinforced polypropylene composite pipe for coal mines according to claim 1, characterized in that, The outer clamp (2) includes two semi-circular clamps (21) and bolts (22) for connecting the two semi-circular clamps (21). The inner surface of the semi-circular clamp (21) in contact with the polypropylene outer layer (5) of the pipe body (1) is provided with an inner clamping groove (211) with an M-shaped cross-section.

3. The wire mesh reinforced polypropylene composite pipe for coal mines according to claim 2, wherein The inner core (3) is circular. The outer surface of the circular inner core (3) in contact with the polypropylene inner layer (8) of the pipe body (1) is provided with an outer clamping groove (31) which is matched with the structure of the inner clamping groove (211) for clamping the ports of the two pipe bodies (1) into an M-shaped cross-section.

4. The wire mesh reinforced polypropylene composite pipe for coal mines according to claim 3, characterized in that, The outer surface of the inner core (3) in contact with the polypropylene inner layer (8) of the pipe body (1) is also provided with a sealing groove (32), and a sealing ring (4) is arranged in the sealing groove (32).

5. The wire mesh reinforced polypropylene composite pipe for coal mines according to claim 4, wherein The sealing ring (4) is a rubber sealing ring.

6. The wire mesh reinforced polypropylene composite pipe for coal mines according to claim 3, characterized in that It also includes a flaring die (9) for flaring the port of the pipe body (1).

7. The wire mesh reinforced polypropylene composite pipe for coal mines according to claim 2, characterized in that, Both ends of the semi-circular clamp (21) are provided with ear plates, and threaded holes for connecting the bolts (22) are opened on the ear plates.

8. The wire mesh reinforced polypropylene composite pipe for coal mines according to claim 3, wherein, The inner surface of the inner core (3) is a smooth surface.

9. The wire mesh reinforced polypropylene composite pipe for coal mines according to claim 3 or 8, characterized in that, The inner diameter of the inner core (3) is the same as the inner diameter of the pipe body (1).

10. The wire mesh reinforced polypropylene composite pipe for coal mines according to claim 1, characterized in that, The outer clamp (2) and the inner core (3) are both made of stainless steel or cast iron.

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