A heating structure of a fiber composite pipe forming apparatus

Abstract

The application provides a heating structure of a fiber composite pipe forming equipment, and belongs to the auxiliary technical field of composite pipe production. The heating structure of the fiber composite pipe forming equipment can improve the forming quality of the fiber composite pipe forming equipment.

Description

TECHNICAL FIELD

[0001] The application belongs to the auxiliary technical field of composite pipe production and relates to a heating structure of a fiber composite pipe forming equipment. BACKGROUND

[0002] The composite pipe is usually made by winding fibers on a composite felt, and such a composite pipe can meet the requirements of high strength and high toughness. However, the fibers are adhered to the composite felt by adhesive, which results in poor adhesion between the fibers and the composite felt. Therefore, the existing composite pipe is formed by injection molding of fibers and PE molten plastic to make the performance of the composite pipe better.

[0003] For example, a heat preservation mechanism of a fiber composite pipe forming equipment is disclosed in Chinese Patent Document (Application No. 202111507937.4), the front end of the outer mold sleeve is inserted with an outer pipe, and one end of the outer pipe extends into the outer mold sleeve, an annular cavity is formed between the outer pipe and the outer mold sleeve for the fiber to pass through, and a core pipe is arranged in the outer pipe and connected with an extruder. The heat preservation mechanism comprises an inner heating sleeve sleeved on the core pipe and a plurality of outer heating sleeves sleeved on the outer mold sleeve, and the plurality of outer heating sleeves are arranged axially along the outer mold sleeve. Although the heat preservation mechanism of the fiber composite pipe forming equipment can realize injection molding of fibers and PE molten plastic, it has the following disadvantages: the inner heating sleeve on the core pipe can only warm the core pipe, and cannot warm the fibers on the outer pipe, so that the temperature difference between the fibers and the PE molten plastic entering the forming cavity through the annular cavity is large, which results in poor adhesion quality of the fibers and the PE molten plastic, and further results in poor forming quality of the existing composite pipe. SUMMARY

[0004] The purpose of the present application is to solve the above-mentioned problems existing in the prior art, and a heating structure of a fiber composite pipe forming equipment is proposed. The technical problem solved by the present application is how to solve the problem of poor forming quality of the existing fiber composite pipe.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A heating structure of a fiber composite pipe forming equipment, comprising an outer pipe and a core pipe arranged in the outer pipe, characterized in that a heat conducting body in the shape of a straight cylinder and made of heat conducting material is sleeved between the outer pipe and the core pipe, and the heat conducting body is in surface contact with the outer pipe and the core pipe respectively, a plurality of heating elements for heating are arranged on the heat conducting body, a plurality of insertion slots extending along the length direction of the heat conducting body are formed on the outer circumferential surface of the heat conducting body, the insertion slots are distributed in the circumferential direction of the heat conducting body, and a temperature adjusting piece made of heat conducting material is detachably inserted into the insertion slots and in contact with the heat conducting body and the outer pipe respectively.

[0007] In use, the heat conduction area between the heat conductor and the outer tube can be adjusted by increasing or decreasing the number of temperature-regulating components in the slots on the heat conductor, according to the required heating temperature of the outer tube. Increasing the number of temperature-regulating components increases the heat conduction area between the heat conductor and the outer tube, resulting in more heat being conducted from the heating element on the heat conductor to the outer tube in the same amount of time, thus raising the heating temperature of the outer tube. Conversely, decreasing the number of temperature-regulating components decreases the heat conduction area between the heat conductor and the outer tube, resulting in less heat being conducted from the heating element on the heat conductor to the outer tube in the same amount of time, thus lowering the heating temperature of the outer tube. Meanwhile, regardless of whether the number of temperature-regulating components in the slots increases or decreases, the heat conduction area between the heat conductor and the core tube remains constant. This allows for differences in the amount of heat conducted by the heating element to the core tube and the outer tube through the same heat conductor, enabling differentiated heat delivery in the heating structure of the fiber composite tube molding equipment. This allows the core tube temperature to be maintained at 180-250 degrees Celsius, and the outer tube temperature at 120-180 degrees Celsius, in order to heat the continuous fibers woven onto the surface of the outer tube. At the same time, it keeps the thermoplastic plastic inside the core tube in a fluid state, improving the bonding quality between the fibers and the molten PE plastic, thereby improving the molding quality of the fiber composite tube molding equipment.

[0008] In the heating structure of the aforementioned fiber composite tube forming equipment, the slot has an arc-shaped cross-section, and at least one end of the slot axially penetrates the heat conductor to form an opening for inserting a temperature-regulating component. The arc-shaped cross-section of the slot minimizes the area of ​​the heat conductor near the core tube that is removed due to the slot, thus meeting and maintaining the higher temperature required by the core tube. The fact that at least one end of the slot penetrates the heat conductor to form an opening for inserting a temperature-regulating component facilitates its insertion and removal.

[0009] In the heating structure of the aforementioned fiber composite tube forming equipment, the temperature regulating element is elongated and has an arc-shaped surface that fits against the inner wall of the outer tube. The inner circumferential surface of the heat conductor fits against the outer wall of the core tube, and the temperature regulating element fits against the groove wall of the slot. This structure makes it more effective to adjust the heat conduction area between the heat conductor and the outer tube by increasing or decreasing the number of temperature regulating elements.

[0010] In the heating structure of the fiber composite tube forming equipment described above, the heating element is a heating tube arranged along the length of the heat conductor, and several heating tubes are evenly distributed circumferentially along the heat conductor. This structure allows the heat from the heating element to be conducted more evenly to the inner and outer circumferential surfaces of the heat conductor, thereby making the heat obtained by the core tube and the outer tube surface more uniform, and thus improving the forming quality of the fiber composite tube forming equipment.

[0011] In the heating structure of the aforementioned fiber composite tube forming equipment, several slots are evenly distributed along the circumference of the heat conductor, and a heating tube is provided between two adjacent slots. This structure makes the heat distribution on the outer tube surface more uniform after adding or removing temperature regulating components, avoiding a situation where one side is hotter than the other, thereby improving the forming quality of the fiber composite tube forming equipment.

[0012] In the heating structure of the aforementioned fiber composite tube forming equipment, the heat conductor is further provided with a wire groove for wiring. The wire groove and several slots are evenly distributed along the circumference of the heat conductor. A portion of the heating tubes are located between two slots, and another portion of the heating tubes are located between the wire groove and the slot. The heating element can continuously generate heat after being energized. The wire groove can be used for wiring the heating element's connecting wire harness. During use, the wire groove cannot be fitted with a temperature regulating component. If a separate wire groove is not provided, one of the slots needs to be reserved as a wire groove. This reserved wire groove cannot be fitted with a temperature regulating component. The above structure also makes the heat obtained by the core tube and the outer tube surface more uniform, thereby improving the forming quality of the fiber composite tube forming equipment.

[0013] In the heating structure of the aforementioned fiber composite tube forming equipment, the inner circumferential surface of the heat conductor is the inner heat-conducting surface, and the outer circumferential surface of the heat conductor is the outer heat-conducting surface. The distance between the heating element and the inner heat-conducting surface of the heat conductor is smaller than the distance between the heating element and the outer heat-conducting surface of the heat conductor. This structure allows the heating element to be positioned closer to the inner circumferential surface of the heat conductor, thereby enabling the heat from the heating element to be conducted to the inner circumferential surface of the heat conductor more quickly, thus meeting and maintaining the higher temperature required by the core tube.

[0014] In the heating structure of the aforementioned fiber composite tube forming equipment, the distance between the heating element and the heat-conducting surface inside the heat conductor is less than the distance between the slot and the heat-conducting surface inside the heat conductor. This structure avoids the slot's placement affecting the heating element's ability to conduct heat to the core tube through the heat conductor, thus meeting and maintaining the higher temperature required by the core tube.

[0015] In the heating structure of the aforementioned fiber composite tube forming equipment, both the heat conductor and the temperature regulating component are cast aluminum parts. Cast aluminum parts not only have excellent thermal conductivity, but also, under the same load conditions, are lighter than structures made of cast iron or cast steel.

[0016] Compared with existing technologies, the heating structure of this fiber composite tube forming equipment has the following advantages: the heating structure of this fiber composite tube forming equipment can adjust the heat conduction area between the heat conductor and the outer tube by increasing or decreasing the number of temperature regulating elements on the heat conductor. This allows the amount of heat conducted from the heating element on the heat conductor to the outer tube in the same amount of time to be increased or decreased accordingly. At the same time, it also allows for differences in the amount of heat conducted from the heating element to the core tube and the outer tube through the same heat conductor, thereby achieving differentiated heat delivery to the core tube and the outer tube. This is to heat the continuous fibers woven on the surface of the outer tube, improve the bonding quality between the fibers and the molten PE plastic, and thus improve the forming quality of the fiber composite tube forming equipment. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of the heating structure of the fiber composite tube forming equipment in use, viewed from the front.

[0018] Fig. 2 This is a cross-sectional view of the heating structure of the fiber composite tube forming equipment during use.

[0019] Fig. 3 This is a side view of the heating structure of the fiber composite tube forming equipment, showing a temperature regulating element installed in the slot section.

[0020] In the diagram, 1 is the heat conductor; 11 is the inner heat-conducting surface; 12 is the outer heat-conducting surface; 2 is the heating element; 3 is the slot; 4 is the temperature regulating component; 5 is the wire groove; 6 is the core tube; and 7 is the outer tube. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] Example 1

[0023] A heating structure for a fiber composite tube forming device, referring to Figs. 1-3The system includes an outer tube 7 and a core tube 6 inserted inside the outer tube 7. A cylindrical heat conductor 1 made of thermally conductive material is fitted between the outer tube 7 and the core tube 6, and the heat conductor 1 is in contact with both the outer tube 7 and the core tube 6. Several heating elements 2 are provided on the heat conductor 1. Several slots 3 extending along the length of the heat conductor 1 are formed on its outer circumferential surface, and these slots 3 are distributed circumferentially along the heat conductor 1. A temperature regulating element 4 made of thermally conductive material is detachably inserted into each slot 3, and the temperature regulating element 4 is in contact with both the heat conductor 1 and the outer tube 7. In this embodiment, it is preferable that both the heat conductor 1 and the temperature regulating element 4 are cast aluminum. Cast aluminum not only has good thermal conductivity, but also, under the same load conditions, the structure is lighter than that of cast iron or cast steel. Furthermore, the cross-section of the slot 3 is arc-shaped, and at least one end of the slot 3 penetrates the heat conductor 1 axially to form an opening for the insertion of the temperature regulating element 4. This design minimizes the area removed from the heat conductor 1 near the core tube 6 due to the slot 3, thus ensuring the core tube 6 maintains its required high temperature. At least one end of the slot penetrates the heat conductor, forming an opening for the insertion or removal of the temperature-regulating component. The temperature-regulating component 4 is elongated and has an arc-shaped surface that conforms to the inner wall of the outer tube 7. The inner circumferential surface of the heat conductor 1 conforms to the outer wall of the core tube 6, and the temperature-regulating component 4 conforms to the wall of the slot 3. This design makes adjusting the heat conduction area between the heat conductor 1 and the outer tube 7 more effective by increasing or decreasing the number of temperature-regulating components 4.

[0024] The heating structure of this fiber composite tube molding equipment can adjust the heat conduction area between the heat conductor 1 and the outer tube 7 by increasing or decreasing the number of temperature regulating elements 4 on the heat conductor 1. This allows the amount of heat conducted from the heating element 2 on the heat conductor 1 to the outer tube 7 within the same time frame to increase or decrease accordingly. It also allows for differences in the amount of heat conducted from the heating element 2 to the core tube 6 and the outer tube 7 through the same heat conductor 1, thereby achieving differentiated heat delivery to the core tube and the outer tube. This heats the continuous fibers woven onto the surface of the outer tube, improves the bonding quality between the fibers and the molten PE plastic, and ultimately improves the molding quality of the fiber composite tube molding equipment.

[0025] Reference Fig. 2 and Fig. 3Furthermore, the heat conductor 1 is also provided with a wire groove 5 for wiring. The wire groove 5 and several slots 3 are evenly distributed around the circumference of the heat conductor 1. Some of the heating tubes are located between two slots 3, and other heating tubes are located between the wire groove 5 and the slot 3. The heat conductor 1 is also provided with a wire groove 5 for wiring. The wire groove 5 and several slots 3 are evenly distributed around the circumference. The heating tubes are located between two slots 3 or between the wire groove 5 and the slot 3. The above structure allows the heat of the heating element 2 to be conducted more evenly to the inner and outer circumferential surfaces of the heat conductor 1, thereby making the heat obtained by the core tube 6 and the outer tube 7 more uniform, and thus improving the molding quality of the fiber composite tube molding equipment. The inner circumferential surface of the heat conductor 1 is the inner heat-conducting surface 11, and the outer circumferential surface of the heat conductor 1 is the outer heat-conducting surface 12. The distance between the heating element 2 and the inner heat-conducting surface 11 of the heat conductor 1 is less than the distance between the heating element 2 and the outer heat-conducting surface 12 of the heat conductor 1. The above structure allows the heating element 2 to be positioned closer to the inner circumferential surface of the heat conductor 1, thereby enabling the heat from the heating element 2 to be conducted to the inner circumferential surface of the heat conductor 1 more quickly, thus meeting and maintaining the higher temperature required by the core tube 6. The distance between the heating element 2 and the inner heat-conducting surface 11 of the heat conductor 1 is smaller than the distance between the slot 3 and the inner heat-conducting surface 11 of the heat conductor 1. This structure avoids the slot 3's placement affecting the heat conduction from the heating element 2 to the core tube 6 through the heat conductor 1, thus meeting and maintaining the higher temperature required by the core tube 6.

[0026] Example 2

[0027] This embodiment is basically the same in structure and principle as Embodiment 1. The difference is that several slots 3 are evenly distributed along the circumference of the heat conductor 1, and a heating tube is provided between two adjacent slots 3. The heat conductor 1 does not have a wire groove 5 for wiring, but one of the slots 3 is used as the wire groove 5. No temperature regulating component 4 is inserted in this slot 3.

[0028] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A heating structure for a fiber composite tube forming device, comprising an outer tube (7) and a core tube (6) inserted within the outer tube (7), characterized in that, A cylindrical heat conductor (1) made of thermally conductive material is fitted between the outer tube (7) and the core tube (6), and the heat conductor (1) is in contact with the outer tube (7) and the core tube (6) respectively. A number of heating elements (2) for heating are provided on the heat conductor (1). A number of slots (3) extending along its length are opened on the outer circumferential surface of the heat conductor (1). The slots (3) are distributed along the circumference of the heat conductor (1). A temperature regulating element (4) made of thermally conductive material is detachably inserted into the slot (3), and the temperature regulating element (4) is in contact with the heat conductor (1) and the outer tube (7) respectively.

2. The heating structure of the fiber composite tube forming equipment according to claim 1, characterized in that, The slot (3) has an arc-shaped cross-section, and at least one end of the slot (3) passes through the heat conductor (1) along the axial direction to form an opening for the insertion of the temperature regulating element (4).

3. The heating structure of the fiber composite tube forming equipment according to claim 1, characterized in that, The temperature regulating component (4) is long and has an arc surface that fits against the inner wall of the outer tube (7). The inner circumferential surface of the heat conductor (1) fits against the outer wall of the core tube (6). The temperature regulating component (4) fits against the groove wall of the slot (3).

4. The heating structure of a fiber composite tube forming device according to any one of claims 1-3, characterized in that, The heating element (2) is a heating tube arranged along the length of the heat conductor (1), and several heating tubes are evenly distributed along the circumference of the heat conductor (1).

5. The heating structure of the fiber composite tube forming equipment according to claim 4, characterized in that, Several slots (3) are evenly distributed along the circumference of the heat conductor (1), and a heating tube is provided between two adjacent slots (3).

6. The heating structure of the fiber composite tube forming equipment according to claim 4, characterized in that, The heat conductor (1) is also provided with a wire groove (5) for wiring. The wire groove (5) and several slots (3) are evenly distributed along the circumference of the heat conductor (1). A portion of the heating tubes are located between two slots (3), and another portion of the heating tubes are located between the wire groove (5) and the slots (3).

7. The heating structure of a fiber composite tube forming device according to any one of claims 1-3, characterized in that, The inner circumferential surface of the heat conductor (1) is the inner heat-conducting surface (11), and the outer circumferential surface of the heat conductor (1) is the outer heat-conducting surface (12). The distance between the heating element (2) and the inner heat-conducting surface (11) of the heat conductor (1) is less than the distance between the heating element (2) and the outer heat-conducting surface (12) of the heat conductor (1).

8. The heating structure of a fiber composite tube forming device according to claim 7, characterized in that, The distance between the heating element (2) and the inner heat-conducting surface (11) of the heat conductor (1) is less than the distance between the slot (3) and the inner heat-conducting surface (11) of the heat conductor (1).

9. The heating structure of a fiber composite tube forming device according to any one of claims 1-3, characterized in that, Both the heat conductor (1) and the temperature regulating component (4) are cast aluminum parts.

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