Glass fiber dosage control system

Abstract

The invention relates to the technical field of glass fiber processing, and discloses a glass fiber dosage control system which comprises a glass fiber dosage control module, a position tracking module, a tension adjusting module, a glue feeding amount control module, a glue content detection module, a quality detection module and a quality evaluation module. The glass fiber consumption control module is used for controlling and adjusting the movement speed of the yarn guide trolley, the rotating speed of the core mold and the tension between the third tension adjusting roller device and the glass fiber combined yarn, and the glass fiber combined yarn is evenly and quantitatively wound on the core mold; the gluing amount of the glass fiber single yarn and the glass fiber combined yarn is controlled and adjusted through a gluing amount control module; the glue content of the glass fiber single yarn and the glass fiber combined yarn is detected and displayed in real time through a glue content detection module, so that the dosage of the glue solution is matched with that of the glass fiber yarn; the quality detection module detects and displays the process quality and the product quality in the glass fiber processing process in real time; and the processing quality of the glass fiber is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of glass fiber processing, in particular to a glass fiber dosage control system. Background Art

[0002] Glass fiber is a fibrous material made from inorganic glass. Its microstructure is primarily composed of glass components and fiber arrangement. Compared to organic fibers, glass fiber offers higher temperature resistance, is non-flammable, corrosion-resistant, and possesses excellent thermal and sound insulation properties, high tensile strength, and excellent electrical insulation. It is widely used in thermal and chemical pipeline insulation. It can also be used to manufacture corrosion-resistant pipes, storage tanks, corrosion-resistant pumps and accessories, corrosion-resistant valves, gratings, ventilation systems, and sewage and wastewater treatment equipment and accessories. The fiberglass winding process involves taking continuous glass fiber or tape, impregnated with resin, or using pre-impregnated fiber, and winding it onto a mandrel in a specific pattern. The fiberglass then cures under heating or room temperature, undergoing a series of treatments to create a product of a specific shape.

[0003] However, existing processes often cannot effectively control the amount of glass fiber and adhesive, resulting in a mismatch between the amount of glass fiber and adhesive, and causing poor quality of glass fiber-wound products. Summary of the Invention

[0004] The object of the present invention is to provide a glass fiber dosage control system to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A glass fiber dosage control system includes a glass fiber dosage control module, a position tracking module, a tension adjustment module, a glue quantity control module, a glue content detection module, a quality detection module and a quality evaluation module; wherein, The glass fiber dosage control module is used to pre-set the process parameters required for winding according to the diameter and length of the core mold, the density of the yarn bundle, the stress intensity requirement, and the travel requirement of the yarn winding. By controlling and adjusting the movement speed of the wire guide trolley, the rotation speed of the core mold, and the tension between the third tension adjustment roller device and the glass fiber yarn, the glass fiber yarn is evenly and quantitatively wound on the core mold with a constant winding angle, thereby achieving regular winding; The position tracking module is used to detect and display in real time the angle between the core mold and the glass fiber yarn according to the angle sensor installed on the core mold; detect and display in real time the rotation speed of the core mold according to the photoelectric encoder installed on the core mold; detect and display in real time the movement speed of the wire guide trolley according to the photoelectric encoder installed on the wire guide trolley, and track the position of the wire guide trolley through the distance measuring sensor, and compare it with the theoretical position of the wire guide trolley to determine whether the position error of the wire guide trolley is within a set range; when the error exceeds the set value, the movement speed of the wire guide trolley and the rotation speed of the core mold are adjusted so that the position error of the wire guide trolley is controlled within the set range; The tension adjustment module is used to adjust the tension of the glass fiber single yarn during the pay-off process and the glass fiber composite yarn during the pay-off and take-up processes respectively; The glue application control module is used to control and adjust the glue application amount of the glass fiber single yarn and the glass fiber composite yarn; The glue content detection module is used to detect and display in real time the glue content of the glass fiber single yarn and the glass fiber composite yarn; The quality detection module is used to detect and display in real time the process quality and product quality during the glass fiber processing; The quality evaluation module is used to judge the process quality and product quality during the glass fiber processing process based on the detected glass fiber quality results and by comparing them with historical data.

[0006] As a further solution of the present invention: the tension adjustment module includes a total tension detection unit, a total tension control unit, a partial tension detection unit, a partial tension control unit, a winding tension detection unit and a winding tension control unit.

[0007] As a further solution of the present invention: the total tension detection unit is used to detect the tension between the second tension adjustment roller device and the glass fiber yarn, and the total tension control unit is used to control the tension between the second tension adjustment roller device and the glass fiber yarn. The partial tension detection unit is used to detect the tension between each first tension adjustment roller device and the glass fiber single yarn, and the partial tension control unit is used to control the tension between each first tension adjustment roller device and the glass fiber single yarn; The winding tension detection unit is used to detect the tension between each third tension adjustment roller device and the glass fiber composite yarn, and the winding tension control unit controls the tension between each first tension adjustment roller device and the glass fiber single yarn.

[0008] As a further solution of the present invention: the glue application amount control module includes an impregnation amount control unit and a spraying amount control unit.

[0009] As a further solution of the present invention: the impregnation amount control unit is used to control the impregnation amount of the glass fiber single yarn in the impregnation tank by controlling the pay-off speed of the glass fiber single yarn and the temperature and viscosity of the glue in the impregnation tank; The spraying amount control unit is used to control the spraying amount of the glue spraying device on the glass fiber composite yarn by controlling the rotation speed of the core mold and the spraying flow and spraying temperature of the glue spraying device.

[0010] As a further solution of the present invention: the glue content detection module includes an impregnation amount detection unit and a spray amount detection unit; wherein, The impregnation amount detection unit is used to detect and display in real time the glue content of the glass fiber single yarn after being impregnated in the glue impregnation tank. When the glue content on the glass fiber single yarn is greater than the set glue content, the spray flow rate of the glue spraying device on the glass fiber composite yarn is reduced. On the contrary, when the glue content on the glass fiber single yarn is less than the set glue content, the spray flow rate of the glue spraying device on the glass fiber composite yarn is increased. The spray amount detection unit detects and displays in real time the glue content of the glass fiber composite yarn after being sprayed by the glue spraying device, and determines whether the spray flow needs to be reduced or increased subsequently; so that the total glue amount on the glass fiber composite yarn is controlled within the set range. Since the two-handover process is adopted, the total glue can be controlled more accurately.

[0011] As a further solution of the present invention: the quality detection module is used to detect and display in real time the process quality and product quality during the glass fiber processing process; it includes a glass fiber fineness detection unit and a glass fiber winding detection unit; wherein, The glass fiber fineness detection unit is used to detect the fineness of the glass fiber yarn at different times during the winding process in real time, calculate the linear density, periodic defects and occasional defects of the glass fiber yarn at different times according to the fineness change value, and use the self-leveling device to adjust the uniformity of the glass fiber yarn to eliminate defects. When the fineness exceeds the set value, an automatic alarm is triggered to ensure the quality of the glass fiber; The glass fiber winding detection unit is used to detect whether slippage and bridging occur during the process of glass fiber composite yarn being wound on the core mold, and whether the uniformity and density of the glass fiber meet the set requirements.

[0012] As a further solution of the present invention: the method for detecting slippage and bridging phenomena in the glass fiber winding detection unit is as follows: First, the magnitude and direction of the force exerted by the glass fiber composite yarn along the curvature radius at any doffing point on the core mold surface are detected. This force is then decomposed into a force F1 perpendicular to the core mold surface and a force F2 perpendicular to the tangent direction of the doffing point. The magnitude and direction of the decomposed forces are then determined. If the force F1 perpendicular to the tangent direction of the doffing point is less than the maximum friction force at the doffing point, it is determined that no slippage has occurred; otherwise, it is determined that slippage has occurred. If the direction of the force F1 perpendicular to the core mold surface is toward the core mold surface, it is determined that no bridging phenomenon occurs; otherwise, it is determined that a bridging phenomenon occurs.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention controls and adjusts the movement speed of the wire guide trolley, the rotation speed of the core mold, and the tension between the third tension adjustment roller device and the glass fiber composite yarn through the glass fiber dosage control module, so that the glass fiber composite yarn is evenly and quantitatively wound on the core mold; controls and adjusts the gluing amount of the glass fiber single yarn and the glass fiber composite yarn through the glue application control module. Since a two-time gluing process is adopted, the total glue amount can be controlled more accurately; then, the glue content of the glass fiber single yarn and the glass fiber composite yarn is detected and displayed in real time through the glue content detection module, so that the amount of glue and the glass fiber yarn are matched; then, the quality detection module detects and displays in real time the process quality and product quality in the glass fiber processing process, thereby ensuring the processing quality of the glass fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a glass fiber dosage control system; Figure 2 It is a structural diagram of a one-time dipping system in a glass fiber dosage control system; Figure 3 This is a structural diagram of secondary glue spraying in a glass fiber dosage control system.

[0015] In the figure: 1. Single yarn reel; 2. Glass fiber single yarn; 3. First tension-adjusting roller device; 4. Glue dipping tank; 5. Second tension-adjusting roller device; 6. Glass fiber combined yarn; 7. Combined yarn reel; 8. Wire guide trolley; 9. Core mold; 10. Self-leveling device; 11. Glue spraying device; 12. Third tension-adjusting roller device; 13. Track. DETAILED DESCRIPTION

[0016] See also Figures 1 to 3 In an embodiment of the present invention, a glass fiber dosage control system includes a glass fiber dosage control module, a position tracking module, a tension adjustment module, a glue amount control module, a glue content detection module, a quality detection module and a quality evaluation module; wherein, The glass fiber dosage control module is used to pre-set the process parameters required for winding, such as the movement speed and stroke of the wire guide trolley 8, the rotation speed of the core mold 9, and the tension and winding angle between the third tension-adjusting roller device 12 and the glass fiber composite yarn 6, based on the diameter and length of the core mold 9, the density of the yarn bundle, the stress intensity requirement, and the travel requirement of the composite yarn reel 7. By controlling and adjusting the movement speed of the wire guide trolley 8, the rotation speed of the core mold 9, and the tension between the third tension-adjusting roller device 12 and the glass fiber composite yarn 6, the glass fiber composite yarn 6 is evenly and quantitatively wound around the core mold 9, with the winding angle remaining unchanged, thereby achieving regular winding; The position tracking module is used to detect and display in real time the angle between the core mold 9 and the glass fiber yarn 6 according to the angle sensor installed on the core mold 9; detect and display in real time the rotation speed of the core mold 9 according to the photoelectric encoder installed on the core mold 9; detect and display in real time the movement speed of the wire guide trolley 8 according to the photoelectric encoder installed on the wire guide trolley 8, and track the position of the wire guide trolley 8 through the distance measuring sensor, and compare it with the theoretical position of the wire guide trolley 8 to determine whether the position error of the wire guide trolley 8 is within the set range; when the error exceeds the set value, the movement speed of the wire guide trolley 8 and the rotation speed of the core mold 9 are adjusted so that the position error of the wire guide trolley 8 is controlled within the set range; The tension adjustment module is used to adjust the tension of the glass fiber single yarn 2 during the pay-off process and the glass fiber composite yarn 6 during the pay-off and take-up process, so that the tension is evenly distributed and the application position is reasonable, minimizing the damage to the glass fiber caused by the tension application process; it includes a total tension detection unit, a total tension control unit, a partial tension detection unit, a partial tension control unit, a winding tension detection unit and a winding tension control unit; wherein, After each glass fiber single yarn 2 is impregnated with glue, it is synthesized into a glass fiber composite yarn 6, and after drying, it is rolled into a composite yarn roll 7, wherein the drying process can be vacuum drying, infrared radiation drying and microwave drying; the total tension detection unit is used to detect the tension between the second tension adjustment roller device 5 and the glass fiber composite yarn 6, and the total tension control unit is used to control the tension between the second tension adjustment roller device 5 and the glass fiber composite yarn 6; the sub-tension detection unit is used to detect the tension between each first tension adjustment roller device 3 and the glass fiber single yarn 2, and the sub-tension control unit is used to control the tension between each first tension adjustment roller device 3 and the glass fiber single yarn 2; When the total tension is too large, reduce the total tension. If the total tension is adjusted to the minimum and still cannot meet the requirements, control and reduce the application of the partial tension to reduce the total tension. When the total tension is too low, the control core controls the application of increased partial tension. If the application of partial tension is adjusted to the limit value and still cannot meet the requirements, the control core controls the application of increased total tension to increase the total tension. In order to make the tension of each yarn uniform, when the tension of a certain yarn is higher than that of other yarns, the corresponding tension of the yarn is reduced, and when the tension of a certain yarn is lower than that of other yarns, the control core increases the corresponding tension of the yarn; The yarn reel 7 is placed into the wire guide trolley 8, which moves left and right along the track 13, and the core mold 9 is rotated to wind the glass fiber yarn 6 sprayed with glue on the core mold 9. The winding tension detection unit is used to detect the tension between each third tension adjustment roller device 12 and the glass fiber yarn 6, and the winding tension control unit controls the tension between each first tension adjustment roller device 3 and the glass fiber single yarn 2; The glue amount control module is used to control and adjust the glue amount of the glass fiber single yarn 2 and the glass fiber composite yarn 6, including an impregnation amount control unit and a spraying amount control unit; wherein, The impregnation amount control unit is used to control the impregnation amount of the glass fiber single yarn 2 in the impregnation tank 4 by controlling the pay-off speed of the glass fiber single yarn 2 and the temperature and viscosity of the glue in the impregnation tank 4; The spraying amount control unit is used to control the spraying amount of the glue spraying device 11 on the glass fiber composite yarn 6 by controlling the rotation speed of the core mold 9 and the spraying flow rate and spraying temperature of the glue spraying device 11; The glue content detection module is used to detect and display in real time the glue content of the glass fiber single yarn 2 and the glass fiber composite yarn 6, including an impregnation amount detection unit and a spraying amount detection unit; wherein, The impregnation amount detection unit is used to detect and display in real time the glue content of the glass fiber single yarn 2 after being impregnated in the glue impregnation tank 4. When the glue content on the glass fiber single yarn 2 is greater than the set glue content, the spray flow rate of the glue spraying device 11 to the glass fiber composite yarn 6 is reduced. Conversely, when the glue content on the glass fiber single yarn 2 is less than the set glue content, the spray flow rate of the glue spraying device 11 to the glass fiber composite yarn 6 is increased. The spraying amount detection unit detects and displays in real time the glue content of the glass fiber composite yarn 6 after being sprayed by the glue spraying device 11, and determines whether the spraying flow rate needs to be reduced or increased subsequently; so that the total glue amount on the glass fiber composite yarn 6 is controlled within the set range. Due to the two-step glue application process, the total glue amount can be controlled more accurately; The quality inspection module is used to detect and display the process quality and product quality of the glass fiber processing in real time; it includes a glass fiber fineness inspection unit and a glass fiber winding inspection unit; among which, The glass fiber fineness detection unit is used to detect the fineness of the glass fiber yarn 6 at different time periods during the winding process in real time, calculate the linear density, periodic defects and occasional defects of the glass fiber yarn 6 at different time periods based on the fineness change value, and use the self-leveling device 10 to adjust the uniformity of the glass fiber yarn 6 to eliminate defects. When the fineness exceeds the set value, an automatic alarm is sounded to ensure the quality of the glass fiber; The glass fiber winding detection unit is used to detect whether slippage and bridging occur during the winding of the glass fiber composite yarn 6 on the core mold 9, and whether the uniformity and density of the glass fiber meet the set requirements. The detection method of slippage and bridging is as follows: Detect the magnitude and direction of the force of the glass fiber composite yarn 6 along the curvature radius at any doffing point on the surface of the core mold 9, and decompose the force into a force F1 perpendicular to the surface of the core mold 9 and a force F2 perpendicular to the tangent direction of the doffing point. Then determine the magnitude and direction of the decomposed force. If the force F1 perpendicular to the tangent direction of the doffing point is less than the maximum friction force at the doffing point, it is determined that no slippage occurs; otherwise, it is determined that slippage occurs. If the direction of the force F1 perpendicular to the surface of the core mold 9 is toward the surface of the core mold 9, it is determined that no bridging phenomenon occurs; otherwise, it is determined that a bridging phenomenon occurs; The quality evaluation module is used to judge the process quality and product quality of the glass fiber processing process based on the detected glass fiber quality results and compare them with historical data.

[0017] The working principle of the present invention is as follows: Figure 2 As shown, first, the glass fiber single yarn 2 on a plurality of single yarn reels 1 is paid out according to demand, and its tension is adjusted by a first tension-adjusting roller device 3. After the tension meets the set requirements, it is immersed in a dipping tank 4 at a set speed. At the same time, the temperature and viscosity of the glue in the dipping tank 4 are controlled so that the pay-out speed of the glass fiber single yarn 2 matches the temperature and viscosity of the glue in the dipping tank 4, thereby achieving matching of the glass fiber usage and the glue application amount. After each glass fiber single yarn 2 is impregnated with the glue solution, its tension is adjusted by the second tension adjustment roller device 5, and multiple glass fiber single yarns 2 are combined into a glass fiber composite yarn 6. After drying, they are wound into a composite yarn roll 7. At the same time, the glue content of the glass fiber single yarn 2 after being impregnated in the glue tank 4 is adjusted; like Figure 3 As shown, the rolled yarn reel 7 is then placed into the wire guide trolley 8, and one end of the glass fiber yarn 6 is fixed to the core mold 9 from the yarn reel 7. Then, according to the diameter and length of the core mold 9, the density of the yarn bundle, the stress intensity requirement, and the travel requirement of the yarn reel 7, the process parameters required for winding are pre-set. By controlling and adjusting the movement speed of the wire guide trolley 8, the rotation speed of the core mold 9, and the tension between the third tension adjustment roller device 12 and the glass fiber yarn 6, the wire guide trolley 8 is moved back and forth on the track 13 to evenly and quantitatively wind the glass fiber yarn 6 on the core mold 9, thereby achieving control of the amount of glass fiber and the amount of glue used. Among them, before the glass fiber composite yarn 6 is wound on the core mold 9, the spray flow rate and spray temperature of the glue spraying device 11 are adjusted according to the glue content of the glass fiber single yarn 2 after being immersed in the glue pool 4, so that the glue content on the glass fiber composite yarn 6 meets the set requirements.

[0018] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A glass fiber dosage control system, characterized in that: It includes glass fiber dosage control module, position tracking module, tension adjustment module, glue quantity control module, glue content detection module, quality detection module and quality evaluation module; among them, The glass fiber dosage control module is used to pre-set the process parameters required for winding according to the diameter and length of the core mold (9), the density state of the yarn bundle, the stress intensity requirement, and the travel requirement of the yarn winding coil (7), and to control and adjust the movement speed of the wire guide trolley (8), the rotation speed of the core mold (9), and the tension between the third tension adjustment roller device (12) and the glass fiber yarn (6), so as to evenly and quantitatively wind the glass fiber yarn (6) on the core mold (9), and keep the winding angle unchanged, thereby achieving regular winding; The position tracking module is used to detect and display in real time the angle between the core mold (9) and the glass fiber composite yarn (6) according to the angle sensor installed on the core mold (9); detect and display in real time the rotation speed of the core mold (9) according to the photoelectric encoder installed on the core mold (9); detect and display in real time the movement speed of the wire guide trolley (8) according to the photoelectric encoder installed on the wire guide trolley (8), and track the position of the wire guide trolley (8) through the distance measuring sensor, and compare it with the theoretical position of the wire guide trolley (8) to determine whether the position error of the wire guide trolley (8) is within a set range; when the error exceeds the set value, the movement speed of the wire guide trolley (8) and the rotation speed of the core mold (9) are adjusted so that the position error of the wire guide trolley (8) is controlled within the set range; The tension adjustment module is used to adjust the tension of the glass fiber single yarn (2) during the pay-off process and the glass fiber composite yarn (6) during the pay-off and take-up processes respectively; The glue application amount control module is used to control and adjust the glue application amount of the glass fiber single yarn (2) and the glass fiber composite yarn (6); The glue content detection module is used to detect and display in real time the glue content of the glass fiber single yarn (2) and the glass fiber composite yarn (6); The quality detection module is used to detect and display in real time the process quality and product quality during the glass fiber processing; The quality evaluation module is used to judge the process quality and product quality during the glass fiber processing process based on the detected glass fiber quality results and by comparing them with historical data.

2. A glass fiber dosage control system according to claim 1, characterized in that: The tension adjustment module includes a total tension detection unit, a total tension control unit, a partial tension detection unit, a partial tension control unit, a winding tension detection unit and a winding tension control unit.

3. A glass fiber dosage control system according to claim 2, characterized in that: The total tension detection unit is used to detect the tension between the second tension adjustment roller device (5) and the glass fiber composite yarn (6), and the total tension control unit is used to control the tension between the second tension adjustment roller device (5) and the glass fiber composite yarn (6). The partial tension detection unit is used to detect the tension between each first tension adjustment roller device (3) and the glass fiber single yarn (2), and the partial tension control unit is used to control the tension between each first tension adjustment roller device (3) and the glass fiber single yarn (2); The winding tension detection unit is used to detect the tension between each third tension adjustment roller device (12) and the glass fiber composite yarn (6), and the winding tension control unit controls the tension between each first tension adjustment roller device (3) and the glass fiber single yarn (2).

4. A glass fiber dosage control system according to claim 1, characterized in that: The glue application amount control module includes an impregnation amount control unit and a spraying amount control unit.

5. A glass fiber dosage control system according to claim 4, characterized in that: The impregnation amount control unit is used to control the impregnation amount of the glass fiber single yarn (2) in the impregnation tank (4) by controlling the pay-off speed of the glass fiber single yarn (2) and the temperature and viscosity of the glue in the impregnation tank (4); The spraying amount control unit is used to control the spraying amount of the glue spraying device (11) on the glass fiber composite yarn (6) by controlling the rotation speed of the core mold (9) and the spraying flow rate and spraying temperature of the glue spraying device (11).

6. A glass fiber dosage control system according to claim 1, characterized in that: The glue content detection module includes an impregnation amount detection unit and a spray amount detection unit; wherein, The impregnation amount detection unit is used to detect and display in real time the glue content of the glass fiber single yarn (2) after being impregnated in the glue impregnation tank (4); when the glue content on the glass fiber single yarn (2) is greater than the set glue content, the spray flow rate of the glue spraying device (11) on the glass fiber composite yarn (6) is reduced; conversely, when the glue content on the glass fiber single yarn (2) is less than the set glue content, the spray flow rate of the glue spraying device (11) on the glass fiber composite yarn (6) is increased; The spraying amount detection unit detects and displays in real time the glue content of the glass fiber composite yarn (6) after being sprayed by the glue spraying device (11), and determines whether it is necessary to reduce or increase the spraying flow rate in the future; so that the total glue amount on the glass fiber composite yarn (6) is controlled within a set range. Due to the use of the two-handing process, the total glue can be controlled more accurately.

7. A glass fiber dosage control system according to claim 1, characterized in that: The quality detection module is used to detect and display the process quality and product quality of the glass fiber processing in real time; it includes a glass fiber fineness detection unit and a glass fiber winding detection unit; wherein, The glass fiber fineness detection unit is used to detect the fineness of the glass fiber composite yarn (6) at different time periods during the winding process in real time, calculate the linear density, periodic defects and occasional defects of the glass fiber composite yarn (6) at different time periods based on the fineness change value, and use the self-adjusting leveling device (10) to adjust the uniformity of the glass fiber composite yarn (6) to eliminate defects. When the fineness exceeds the set value, an automatic alarm is issued to ensure the quality of the glass fiber; The glass fiber winding detection unit is used to detect whether slippage and bridging occur during the process of the glass fiber composite yarn (6) being wound on the core mold (9), and whether the uniformity and density of the glass fiber meet the set requirements.

8. A glass fiber dosage control system according to claim 7, characterized in that: The method for detecting slippage and bridging phenomena in the glass fiber winding detection unit is as follows: First, the magnitude and direction of the force of the glass fiber composite yarn (6) along the curvature radius at any doffing point on the surface of the core mold (9) are detected, and the force is decomposed into a force F1 perpendicular to the surface of the core mold (9) and a force F2 perpendicular to the tangent direction of the doffing point, and the magnitude and direction of the decomposed force are determined, wherein, if the force F1 perpendicular to the tangent direction of the doffing point is less than the maximum friction force at the doffing point, it is determined that no slippage occurs; otherwise, it is determined that slippage occurs; If the direction of the force F1 perpendicular to the surface of the core mold (9) is toward the direction of the surface of the core mold (9), it is determined that no bridging phenomenon occurs; otherwise, it is determined that a bridging phenomenon occurs.

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