Inhaul cable anchor ring heating dismounting control method and system

Abstract

The invention discloses an inhaul cable anchor ring heating dismantling control method and system, and the method comprises the steps: firstly, obtaining the specification parameter, the physical property parameter and the initial temperature of a to-be-dismantled anchor ring, and the heating power and the target temperature of an electromagnetic coil; then, according to the specification parameters, the physical property parameters, the initial temperature, the heating power and the target temperature, the heating time needed for heating the anchor ring to be detached to the target temperature is predicted through a heating time model; afterwards, whether the predicted heating time is reasonable or not is judged, and when the predicted heating time is unreasonable, the initially set heating power is adjusted, and the heating time is predicted again until the predicted heating time is reasonable. And finally, the electromagnetic coil is controlled to heat the anchor ring to be disassembled according to reasonable heating time and heating power, the friction force generated when the anchor ring is screwed out is reduced, and therefore the rusted anchor ring can be disassembled efficiently and losslessly. And electromagnetic induction is adopted, so that energy concentration and accurate temperature control can be realized, diffusion of a heat affected zone is avoided, and the heat influence on a surrounding structure is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge parts, and in particular to a cable anchor ring heating and removal control method and system. Background Art

[0002] During the removal of cables from cable-stayed, suspension, and mid-through arch bridges, the cable anchor rings are prone to rust due to long-term exposure to moisture, salt spray, and other environments. Rust and excess filler at the contact area between the anchor ring and the anchor cup increase the bond between the anchor ring and the cable body or anchor end, or the anchor cup swells and deforms, making it difficult to remove the anchor ring by tightening it. Furthermore, the confined space surrounding the cable anchor head precludes the use of large equipment. Traditional removal methods typically include flame cutting the anchor ring, mechanically crushing the anchor ring, and stress-cutting the cable body before threading it through the cable guide toward the anchor head. However, rust causes the anchor ring to bond tightly to the cable body, making removal inefficient using methods such as high-temperature flames, mechanical crushing, and stress-cutting, which can easily damage the cable body and beam. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention proposes a cable anchor ring heating removal control method and system. This method rationally controls the electromagnetic coil to locally heat the anchor ring, utilizing the thermal expansion effect to weaken the rusted interface, allowing for efficient and non-destructive removal of the rusted anchor ring. The specific technical solution is as follows: In a first aspect, a method for controlling the heating and removal of a cable anchor ring is provided. In a first possible implementation of the first aspect, the method includes: Obtain the specifications, physical properties and initial temperature of the anchor ring to be removed, and set the heating power and target temperature of the electromagnetic coil; Predicting the heating time of the electromagnetic coil by a heating time model established based on a heat balance equation according to the specification parameters, physical property parameters, initial temperature, heating power and target temperature; determining whether the heating time is reasonable, and in response to the heating time being unreasonable, adjusting the heating power of the electromagnetic coil and recalculating the heating time until the heating time is reasonable; The electromagnetic coil is controlled to heat the anchor ring to be removed according to the adjusted heating power and heating time.

[0004] In combination with the first implementable manner of the first aspect, in a second implementable manner of the first aspect, the heat balance equation is: ; The heating time model established based on the heat balance equation is: ; in, is the heating power, is the anchor ring density, is the volume of the anchor ring, is the specific heat capacity of the anchor ring, is the atmospheric heat dissipation power, is the heat conduction power of the thread, is the comprehensive convection heat transfer coefficient of the anchor ring, The exposed surface area of the anchor ring is Heating temperature for the anchor ring, is the initial temperature, is the thermal conductivity of the anchor ring, is the thread contact cross-sectional area, is the effective heat conduction length of the thread, is the target temperature.

[0005] In combination with the second implementable manner of the first aspect, in a third implementable manner of the first aspect, the comprehensive convection heat transfer coefficient is determined based on the natural convection heat transfer coefficient and the anchor ring surface reflectivity. The specific calculation formula is as follows: ; ; in, is the reflectivity of the anchor ring surface, is the natural convection heat transfer coefficient, is the Stefan-Boltzmann constant.

[0006] In combination with the first implementable manner of the first aspect, in a fourth implementable manner of the first aspect, the thread contact cross-sectional area between the anchor cup and the anchor ring to be removed is calculated according to specification parameters of the anchor.

[0007] In combination with any one of the first to fourth possible implementations of the first aspect, in a fifth possible implementation of the first aspect, controlling the electromagnetic coil to heat the anchor ring to be removed includes: Calculating the real-time temperature of the anchor ring to be removed in real time based on the initial temperature, physical parameters, specification parameters, heating power and heating time of the anchor ring to be removed; The radial elongation of the anchor ring to be removed is calculated in real time according to the real-time temperature and the linear expansion coefficient of the anchor ring.

[0008] In a second aspect, a cable anchor ring heating removal control system is provided. In a first possible implementation of the second aspect, the control system includes: A data acquisition module is configured to obtain specification parameters, physical properties and initial temperature of the anchor ring to be removed, and set the heating power and target temperature of the electromagnetic coil; a time prediction module configured to predict the heating time of the electromagnetic coil according to the specification parameters, physical property parameters, initial temperature, heating power and target temperature by using a heating time model established based on a heat balance equation; a parameter adjustment module configured to determine whether the heating time is reasonable, and in response to the heating time being unreasonable, adjust the heating power of the electromagnetic coil and recalculate the heating time until the heating time is reasonable; The heating control module is configured to control the electromagnetic coil to heat the anchor ring to be removed according to the adjusted heating power and heating time.

[0009] In combination with the first implementable manner of the second aspect, in a second implementable manner of the second aspect, the data acquisition module includes: The contact area unit is configured to calculate the thread contact cross-sectional area between the anchor cup and the anchor ring to be removed according to the specification parameters of the anchor.

[0010] In combination with the first or second implementation manner of the second aspect, in a third implementation manner of the second aspect, the heating control module includes: a temperature calculation unit configured to calculate the real-time temperature of the anchor ring to be removed according to the initial temperature, physical parameters, specification parameters, heating power and heating time of the anchor ring to be removed; The deformation calculation unit is configured to calculate the radial elongation of the anchor ring to be removed in real time according to the real-time temperature and the linear expansion coefficient of the anchor ring.

[0011] Beneficial Effects: The cable anchor ring heating removal control method and system of the present invention can predict the heating time required for the electromagnetic coil to heat the anchor ring to be removed to a set target temperature based on the specification parameters and physical properties of the anchor ring to be removed, combined with the initial temperature of the environment in which the anchor ring is located, through a heating time model constructed based on a heat balance equation. If the heating time cannot meet the anchor ring removal requirements, the heating power of the electromagnetic coil can be adjusted to meet the removal requirements. Finally, the electromagnetic coil can be precisely controlled to heat the anchor ring to be removed according to the heating time and heating power that meet the removal requirements, causing the anchor ring to be removed to expand due to heat, increasing the gap between the anchor ring and the anchor cup, and melting the sticky materials in the thread gap between the anchor ring and the anchor cup, reducing the friction when the anchor ring is unscrewed, so as to remove the rusted anchor ring efficiently and non-destructively. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0013] Figure 1 A flow chart of a cable anchor ring heating removal control method provided by one embodiment of the present invention; Figure 2 This is a system block diagram of a cable anchor ring heating and removal control system provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0014] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0015] like Figure 1 The flowchart of the cable anchor ring heating removal control method shown in FIG. 1 includes: Step 1: Obtain the specification parameters, physical properties and initial temperature of the anchor ring to be removed, and set the heating power and target temperature of the electromagnetic coil; Step 2: predicting the heating time of the electromagnetic coil according to the specification parameters, physical property parameters, initial temperature, heating power and target temperature through a heating time model established based on a heat balance equation; Step 3: determining whether the heating time is reasonable; in response to the heating time being unreasonable, adjusting the heating power of the electromagnetic coil and recalculating the heating time until the heating time is reasonable; Step 4: Control the electromagnetic coil to heat the anchor ring to be removed according to the adjusted heating power and heating time.

[0016] Specifically, the specifications and physical properties of the anchor ring to be removed can be obtained from relevant documentation. The initial temperature of the anchor ring's location can be measured using temperature detection equipment, and the electromagnetic coil's heating power and target temperature can be manually set. Then, based on the specifications, physical properties, initial temperature, heating power, and target temperature, a heating time model based on a heat balance equation can be used to calculate the heating time required for the electromagnetic coil to heat the anchor ring to the target temperature at the currently set heating power.

[0017] The calculated heating time can then be compared with a set reasonable time range. If the calculated heating time exceeds or falls below the reasonable time range, the initially set heating power can be increased or decreased. If the calculated heating time exceeds the maximum reasonable time, the heating power can be increased to shorten the heating time, and the heating time can be recalculated based on the adjusted heating power. This process is repeated until the calculated heating time matches the reasonable time range.

[0018] Finally, the electromagnetic coil can be wrapped around the anchor ring to be removed. The electromagnetic coil is then precisely controlled to heat the anchor ring according to a reasonable heating time and power. This causes the anchor ring to expand due to heat, increasing the gap between the anchor ring and the anchor cup. This also melts the sticky material in the thread gap between the anchor ring and the anchor cup, reducing friction when the anchor ring is unscrewed. When the electromagnetic coil has heated the anchor ring for the predicted heating time, the anchor ring can be clamped and rotated using a fixture, effectively and non-destructively removing the rusted anchor ring. Furthermore, the use of electromagnetic induction non-contact heating allows for concentrated energy and precise temperature control, preventing the spread of the heat-affected zone and potentially reducing thermal impact on surrounding structures.

[0019] In this embodiment, optionally, according to the law of conservation of energy, the heating power of the electromagnetic coil is equal to the sum of the stored energy and the dissipated heat of the anchor ring to be removed, where the dissipated heat includes the heat dissipation power of the atmosphere and the heat conduction power of the thread. The heat balance equation thus constructed is: ; The heating time model established based on the heat balance equation is: ; in, is the heating power, is the anchor ring density, is the volume of the anchor ring, is the specific heat capacity of the anchor ring, is the atmospheric heat dissipation power, is the heat conduction power of the thread, is the comprehensive convection heat transfer coefficient of the anchor ring, The exposed surface area of the anchor ring is Heating temperature for the anchor ring, is the initial temperature, is the thermal conductivity of the anchor ring, is the thread contact cross-sectional area, is the effective heat conduction length of the thread, , is the target temperature.

[0020] In this embodiment, optionally, the thread contact cross-sectional area between the anchor cup and the anchor ring to be removed is calculated based on the specification parameters of the anchor.

[0021] Specifically, the thread contact cross-sectional area refers to the thread contact cross-sectional area between the anchor cup and the anchor ring to be removed, and needs to be determined based on the actual situation on site. Specifically, the number of meshing turns between the anchor cup and the anchor ring to be removed can be determined based on the specifications of the anchor ring to be removed. Then, the thread contact cross-sectional area can be calculated based on the number of meshing turns and the specifications. The specific calculation formula is as follows: ; in, is the number of engagement circles between the anchor cup and the anchor ring to be removed, is the nominal diameter of the thread of the anchor ring, is the pitch of the anchor ring, is the tooth angle of the anchor ring, is the helix angle of the anchor ring, which can be calculated using the following formula: .

[0022] In this embodiment, optionally, controlling the electromagnetic coil to heat the anchor ring to be removed includes: Calculating the real-time temperature of the anchor ring to be removed in real time based on the initial temperature, physical parameters, specification parameters, heating power and heating time of the anchor ring to be removed; The radial elongation of the anchor ring to be removed is calculated in real time according to the real-time temperature and the linear expansion coefficient of the anchor ring.

[0023] Specifically, during the process of heating the anchor ring to be removed by the electromagnetic coil, the initial temperature of the anchor ring to be removed can also be monitored in real time by a temperature detection device. The real-time temperature of the anchor ring to be removed is calculated based on the initial temperature, physical properties, specification parameters, heating power, and heating time of the anchor ring to be removed, and the change of the heating temperature of the anchor ring to be removed over time is determined. The specific calculation formula is as follows: ; in, is the time constant, and the specific calculation formula is as follows: .

[0024] The calculated real-time temperature, combined with the linear expansion coefficient of the anchor ring to be removed, can be used to calculate the real-time radial elongation of the anchor ring to be removed. The radial elongation can be used to determine whether the gap between the anchor ring to be removed and the anchor cup is sufficient to loosen the anchor ring. If not, the electromagnetic coil can continue to heat the anchor ring to be removed. If sufficient, heating can be stopped before the heating time is reached. The specific formula for calculating radial elongation is as follows: ; in, is the linear expansion coefficient of the anchor ring, is the initial radius of the anchor ring.

[0025] In this embodiment, optionally, the comprehensive convection heat transfer coefficient can be determined according to the natural convection heat transfer coefficient and the anchor ring surface reflectivity. The specific calculation formula is as follows: ; ; in, is the reflectivity of the anchor ring surface, is the natural convection heat transfer coefficient, is the Stefan-Boltzmann constant.

[0026] like Figure 2 The system block diagram of the cable anchor ring heating removal control system shown in the figure includes: A data acquisition module is configured to obtain specification parameters, physical properties and initial temperature of the anchor ring to be removed, and set the heating power and target temperature of the electromagnetic coil; a time prediction module configured to predict the heating time of the electromagnetic coil according to the specification parameters, physical property parameters, initial temperature, heating power and target temperature by using a heating time model established based on a heat balance equation; a parameter adjustment module configured to determine whether the heating time is reasonable, and in response to the heating time being unreasonable, adjust the heating power of the electromagnetic coil and recalculate the heating time until the heating time is reasonable; The heating control module is configured to control the electromagnetic coil to heat the anchor ring to be removed according to the adjusted heating power and heating time.

[0027] Specifically, the control system includes a data acquisition module, a time prediction module, a parameter adjustment module, and a heating control module. The data acquisition module retrieves the specifications and physical properties of the anchor ring to be removed from relevant documentation, uses temperature detection equipment to detect the initial temperature of the anchor ring's location, and manually sets the electromagnetic coil's heating power and target temperature. The time prediction module uses the specifications, physical properties, initial temperature, heating power, and target temperature, and a heating time model based on thermal equilibrium equations to calculate the heating time required for the electromagnetic coil to heat the anchor ring to the target temperature at the currently set heating power.

[0028] The parameter adjustment module can compare the calculated heating time with a set reasonable time range. If the calculated heating time exceeds or falls below the reasonable time range, the module can increase or decrease the initially set heating power and recalculate the heating time based on the adjusted heating power. This process is repeated until the calculated heating time matches the reasonable time range.

[0029] The heating control module controls the electromagnetic coil to heat the anchor ring to be removed according to the appropriate heating time and power. This causes the anchor ring to expand due to heat, increasing the gap between the anchor ring and the anchor cup. This also melts the sticky material in the thread gap between the anchor ring and the anchor cup, reducing friction when the anchor ring is unscrewed, allowing for efficient and non-destructive removal of rusted anchor rings. Furthermore, the use of electromagnetic induction non-contact heating allows for concentrated energy and precise temperature control, preventing the spread of the heat-affected zone and potentially minimizing thermal impact on surrounding structures.

[0030] In this embodiment, optionally, the data acquisition module includes: a contact area unit configured to calculate the thread contact cross-sectional area according to the number of meshing turns and specification parameters.

[0031] Specifically, the data acquisition module includes a contact area unit, which can calculate the thread contact cross-sectional area based on the number of meshing circles and specification parameters of the anchor ring to be removed and the anchor cup, and the specific calculation formula is as above.

[0032] In this embodiment, optionally, the heating control module includes: a temperature calculation unit configured to calculate the real-time temperature of the anchor ring to be removed according to the initial temperature, physical parameters, specification parameters, heating power and heating time of the anchor ring to be removed; The deformation calculation unit is configured to calculate the radial elongation of the anchor ring to be removed in real time according to the real-time temperature and the linear expansion coefficient of the anchor ring.

[0033] Specifically, the heating control module includes a temperature calculation unit and a deformation calculation unit. The temperature calculation unit calculates the real-time temperature of the anchor ring to be removed based on its initial temperature, physical properties, specifications, heating power, and heating duration, and determines how the heating temperature of the anchor ring changes over time. The deformation calculation unit uses the calculated real-time temperature, combined with the linear expansion coefficient of the anchor ring, to calculate the real-time radial elongation of the anchor ring.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A cable anchor ring heating removal control method, characterized in that: include: Obtain the specifications, physical properties and initial temperature of the anchor ring to be removed, and set the heating power and target temperature of the electromagnetic coil; Predicting the heating time of the electromagnetic coil using a heating time model established based on a heat balance equation according to the specification parameters, physical property parameters, initial temperature, heating power, and target temperature; determining whether the heating time is reasonable, and in response to the heating time being unreasonable, adjusting the heating power of the electromagnetic coil and recalculating the heating time until the heating time is reasonable; The electromagnetic coil is controlled to heat the anchor ring to be removed according to the adjusted heating power and heating time.

2. The cable anchor ring heating removal control method according to claim 1, characterized in that: The heat balance equation is: ； The heating time model established based on the heat balance equation is: ； in, is the heating power, is the anchor ring density, is the volume of the anchor ring, is the specific heat capacity of the anchor ring, is the atmospheric heat dissipation power, is the heat conduction power of the thread, is the comprehensive convection heat transfer coefficient of the anchor ring, The exposed surface area of the anchor ring is Heating temperature for the anchor ring, is the initial temperature, is the thermal conductivity of the anchor ring, is the thread contact cross-sectional area, is the effective heat conduction length of the thread, is the target temperature.

3. The cable anchor ring heating removal control method according to claim 2, characterized in that: The comprehensive convection heat transfer coefficient is determined according to the natural convection heat transfer coefficient and the anchor ring surface reflectivity. The specific calculation formula is as follows: ； ； in, is the reflectivity of the anchor ring surface, is the natural convection heat transfer coefficient, is the Stefan-Boltzmann constant.

4. The cable anchor ring heating removal control method according to claim 1, characterized in that: Calculate the thread contact cross-sectional area between the anchor cup and the anchor ring to be removed based on the specifications of the anchor.

5. The cable anchor ring heating removal control method according to any one of claims 1 to 4, characterized in that: Controlling the electromagnetic coil to heat the anchor ring to be removed includes: Calculating the real-time temperature of the anchor ring to be removed in real time based on the initial temperature, physical parameters, specification parameters, heating power and heating time of the anchor ring to be removed; The radial elongation of the anchor ring to be removed is calculated in real time according to the real-time temperature and the linear expansion coefficient of the anchor ring.

6. A cable anchor ring heating removal control system, characterized in that: include: A data acquisition module is configured to obtain specification parameters, physical properties and initial temperature of the anchor ring to be removed, and set the heating power and target temperature of the electromagnetic coil; a time prediction module configured to predict the heating time of the electromagnetic coil according to the specification parameters, physical property parameters, initial temperature, heating power and target temperature by using a heating time model established based on a heat balance equation; a parameter adjustment module configured to determine whether the heating time is reasonable, and in response to the heating time being unreasonable, adjust the heating power of the electromagnetic coil and recalculate the heating time until the heating time is reasonable; The heating control module is configured to control the electromagnetic coil to heat the anchor ring to be removed according to the adjusted heating power and heating time.

7. The cable anchor ring heating removal control system according to claim 6, characterized in that: The data acquisition module includes: The contact area unit is configured to calculate the thread contact cross-sectional area between the anchor cup and the anchor ring to be removed according to the specification parameters of the anchor.

8. The cable anchor ring heating removal control system according to claim 6 or 7, characterized in that: The heating control module includes: a temperature calculation unit configured to calculate the real-time temperature of the anchor ring to be removed according to the initial temperature, physical parameters, specification parameters, heating power and heating time of the anchor ring to be removed; The deformation calculation unit is configured to calculate the radial elongation of the anchor ring to be removed in real time according to the real-time temperature and the linear expansion coefficient of the anchor ring.

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