Deck t-beam heating pre-arching method

Abstract

The present application relates to the technical field of shipbuilding, in particular to a deck T-beam heating pre-arching method, which comprises the following steps: S1, placing a deck on a horizontal plane, with the T-beam of the deck facing upwards; S2, setting position points to be heated on the T-beam; S3, heating the position points to a set temperature using an electromagnetic heating device; S4, stopping heating and naturally cooling each position point, so that the deck is in a pre-arched state; S5, measuring the height difference between the middle position of the deck and the two ends of the deck; S6, determining whether the height difference is within a pre-arching range value, and if so, it is determined that the pre-arching operation is completed. The present application can effectively pre-arch the deck while ensuring operation efficiency and improving pre-arching effect.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a method for heating and pre-cambering a deck T-beam. Background Technology

[0002] Currently, roll-on / roll-off (Ro-Ro) ships are very popular internationally, especially PCTC (Polycarbonate Carrier) type ships. PCTC ships are primarily built using thin-plate materials. During construction, the deck consists of thin plates and T-beams connecting and supporting these plates. When the deck is in the sectional manufacturing stage, to prevent deformation such as a concave center after the deck flips, a water-fire pre-arching process is required on the T-beams. However, this water-fire pre-arching process is based on traditional leveling operations, resulting in extremely low efficiency. Furthermore, the uneven shrinkage of the steel plates after heating causes material damage, and the pre-arching process relies entirely on the experience of the processing personnel, leading to uncontrollable pre-arching results.

[0003] Therefore, a heated pre-cambering method for deck T-beams is needed to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a method for heating and pre-cambering deck T-beams, which can effectively pre-camber the deck while ensuring operational efficiency and improving the pre-cambering effect.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The method for heating and pre-cambering deck T-beams includes the following steps:

[0007] S1. Place the deck on a horizontal surface with the T-beams of the deck facing upwards;

[0008] S2. Set the position point to be heated on the T-beam;

[0009] S3. Use an electromagnetic heating device to heat the location point to a set temperature;

[0010] S4. Stop heating and allow each of the aforementioned locations to cool naturally, so that the deck is in a pre-arched state;

[0011] S5. Measure the height difference between the middle position of the deck and the two ends of the deck;

[0012] S6. Determine whether the height difference is within the pre-arch range. If so, the pre-arch operation is considered complete.

[0013] Furthermore, in step S2, the middle area of ​​the deck is defined along the extension direction of the T-beam, and the position point to be heated is set on the T-beam located in the middle area.

[0014] Furthermore, in step S2, a mark is set at the location point.

[0015] Furthermore, in step S3, the position points on different T-beams located on the same horizontal line are heated simultaneously.

[0016] Furthermore, in step S3, all of the said location points are heated simultaneously.

[0017] Furthermore, a temperature detector is installed on the T-beam to detect the heating temperature.

[0018] Furthermore, in step S3, the area heated by the electromagnetic heating device on the panel of the T-beam is rectangular, and the area heated on the web of the T-beam is inverted triangular, with the heating area of ​​the web directly opposite the heating area of ​​the panel.

[0019] Furthermore, the apex angle of the inverted triangular heating area on the web is set according to the thickness of the web.

[0020] Furthermore, in step S5, the height difference is measured using a string measurement method.

[0021] Furthermore, the electromagnetic heating device is equipped with a current regulator and a control switch.

[0022] The beneficial effects of this invention are:

[0023] This invention provides a method for heating and pre-arching a deck T-beam. The deck is placed on a horizontal surface, and a heating point is set. An electromagnetic heating device heats the point to a predetermined temperature. After the heated point cools naturally, the deck is in a pre-arched state. The height difference between the middle and both ends of the deck is measured. If the height difference is within the pre-arching range, the pre-arching operation is considered complete. By using electromagnetic heating, alternating currents (eddy currents) are generated in the metal parts. These eddy currents cause the charge carriers in the T-beam to move at high speed and randomly. The friction and collision between the charge carriers and atoms generate heat energy, resulting in instantaneous heating. This improves heating efficiency, achieves penetrating heating, and results in more uniform steel plate shrinkage. This method effectively pre-archs the deck while ensuring operational efficiency and improving the pre-arching effect. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0025] Figure 1This is a schematic diagram of the heating position points of a deck T-beam heating and pre-arching method according to the present invention;

[0026] Figure 2 This is a schematic diagram of the heating of the T-beam in the pre-arching heating method for a deck T-beam of the present invention.

[0027] In the picture:

[0028] 1. Deck; 2. T-beam; 21. Location point; 3. Electromagnetic heating device. Detailed Implementation

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings, not all of them.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] During ship construction, the deck consists of thin plates and T-beams that connect and support these plates. When the deck is in the sectional manufacturing stage, to prevent deformation such as a concave center after the deck overturns, a water-fire pre-arching process is required on the T-beams. However, this water-fire pre-arching process is based on traditional leveling operations, resulting in extremely low efficiency. Furthermore, the uneven shrinkage of the steel plates after heating causes material damage, and the pre-arching process relies entirely on the experience of the processing personnel, leading to uncontrollable pre-arching results.

[0033] In order to effectively pre-camber the deck while ensuring operational efficiency and improving the pre-camber effect, such as Figures 1-2As shown, this invention provides a method for heating and pre-cambering a deck T-beam. The method for heating and pre-cambering a deck T-beam includes the following steps:

[0034] S1. Place deck 1 on a horizontal surface with T-beam 2 of deck 1 facing upwards;

[0035] S2. Set the position point 21 to be heated on T-beam 2;

[0036] S3. Use electromagnetic heating device 3 to heat position point 21 to the set temperature;

[0037] S4. Stop heating and allow each location point 21 to cool naturally, so that the deck 1 is in a pre-arched state;

[0038] S5. Measure the height difference between the middle position of deck 1 and the two ends of deck 1;

[0039] S6. Determine whether the height difference is within the pre-arch range. If so, the pre-arch operation is considered complete.

[0040] By using electromagnetic heating, alternating current (eddy current) is generated in the metal part. The eddy current causes the charge carriers of T-beam 2 to move at high speed and randomly. The charge carriers and atoms generate heat energy through friction and collision, thus producing an instantaneous heating effect, thereby improving heating efficiency and realizing penetrating heating. The steel plate shrinks more evenly, which can effectively pre-arch the deck 1 while ensuring work efficiency and improving the pre-arching effect.

[0041] Further, in step S2, the middle region of the deck 1 is defined along the extension direction of the T-beam 2, and a heating point 21 is set on the T-beam 2 located in the middle region. Because heating the deck 1 causes the middle of the deck 1 to be concave and the two ends to be raised, defining the middle region and determining the heating point 21 ensures that the T-beam 2 in the middle region shrinks and deforms after heating, while the T-beams 2 at the two ends of the deck 1 remain unchanged. This results in a concave shape in the middle region. After the deck 1 is flipped, the concave middle region forms an arch, slowly returning to a flat state under the action of gravity, meeting the requirements for subsequent use.

[0042] Furthermore, in step S2, a mark is set at location point 21. Specifically, water-based paint can be used to mark location point 21, so that during subsequent heating, the construction personnel can quickly locate the construction area, thereby enabling rapid heating of the location point 21 to be heated and avoiding any omissions. In other embodiments, other marking methods can also be used, and no further restrictions are imposed here.

[0043] Furthermore, in step S3, the position points 21 on different T-beams 2 located on the same horizontal line are heated simultaneously. When the deck 1 is in a large segment, using multiple electromagnetic heating devices 3 to heat all position points 21 would be costly. Therefore, by heating the position points 21 on the same horizontal line simultaneously, the deformation of the T-beams 2 at that horizontal line is made uniform, thereby controlling the deformation of the deck 1. During the heating process using this method, after heating the position points 21 on one horizontal line, all position points 21 on the next horizontal line are quickly heated to avoid uneven shrinkage due to excessively long time intervals.

[0044] Furthermore, in step S3, all position points 21 are heated simultaneously. When dealing with smaller deck 1 sections, heating all position points 21 simultaneously ensures consistent heating, thereby ensuring consistent steel plate shrinkage.

[0045] Furthermore, a temperature detector is installed on the T-beam 2 to monitor the heating temperature. By installing the temperature detector, the temperature at the heating point 21 can be monitored in real time, ensuring that the heating temperature meets the set value. In this embodiment, the T-beam 2 is heated to 700 degrees Celsius. In other embodiments, the heating temperature can be set according to actual needs, and no further restrictions are imposed here.

[0046] Furthermore, in step S3, the area heated by the electromagnetic heating device 3 on the panel of the T-beam 2 is rectangular, and the area heated on the web of the T-beam 2 is inverted triangular, with the heating area of ​​the web directly opposite the heating area of ​​the panel. This method sets the shape of the heating point 21, and by designing the heating area in a wedge-like shape, it facilitates the contraction and deformation of the T-beam 2.

[0047] Furthermore, the apex angle of the inverted triangular heating area on the web is set according to the thickness of the web. Since the inverted triangular heating area affects the deformation of the web, setting the included angle of the inverted triangle based on the thickness of the web ensures that the web deformation meets the requirements.

[0048] Furthermore, in step S5, the height difference is measured using a string line measurement method. By stringing a string on deck 1, the height difference of the deformation in the middle area can be quickly determined, and the accuracy of the measured data can be guaranteed.

[0049] Furthermore, the electromagnetic heating device 3 is equipped with a current regulator and a control switch. The current regulator allows adjustment of the current as needed, thereby regulating the heating time. The control switch allows the device to be turned on when heating point 21 is required and turned off after heating is complete, facilitating the use of the electromagnetic heating device 3.

[0050] The advantages of this invention are:

[0051] 1. Achieve programmed temperature control. The heating time curve is determined based on equipment performance, and the temperature can be set according to different plate thicknesses, eliminating reliance on manual skills.

[0052] 2. Higher heating efficiency. Heating time is determined by the thickness of the steel plate; for example, a setting of 4 seconds allows the steel plate to reach a temperature of 700℃ for heat penetration, thus improving construction efficiency.

[0053] 3. Achieves penetrating heating, resulting in more uniform shrinkage of the steel plate.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for heating and pre-cambering deck T-beams, characterized in that, Includes the following steps: S1. Place the deck (1) on a horizontal surface with the T-beam (2) of the deck (1) facing upwards; S2. Set the position point (21) to be heated on the T-beam (2); delineate the middle area of ​​the deck (1) along the extension direction of the T-beam (2), and set the position point (21) to be heated on the T-beam (2) located in the middle area; S3. The electromagnetic heating device (3) is used to heat the position point (21) to a set temperature. The area heated by the electromagnetic heating device (3) on the panel of the T beam (2) is rectangular, and the area heated by the electromagnetic heating device (3) on the web of the T beam (2) is inverted triangular. The heating area of ​​the web is directly opposite the heating area of ​​the panel. The apex angle of the inverted triangular heating area on the web is set according to the thickness of the web. S4. Stop heating and allow each of the aforementioned locations (21) to cool naturally, so that the deck (1) is in a pre-arched state; S5. Measure the height difference between the middle position of the deck (1) and the two ends of the deck (1); S6. Determine whether the height difference is within the pre-arch range. If so, the pre-arch operation is considered complete.

2. The method for heating and pre-cambering deck T-beams according to claim 1, characterized in that, In step S2, a mark is set at the location point (21).

3. The method for heating and pre-cambering deck T-beams according to claim 1, characterized in that, In step S3, the position points (21) on different T beams (2) located on the same horizontal line are heated simultaneously.

4. The method for heating and pre-cambering deck T-beams according to claim 1, characterized in that, In step S3, all the location points (21) are heated simultaneously.

5. The method for heating and pre-cambering deck T-beams according to claim 1, characterized in that, A temperature detector is installed on the T-beam (2) to detect the heating temperature.

6. The method for heating and pre-cambering deck T-beams according to claim 1, characterized in that, In step S5, the height difference is measured using a string measurement method.

7. The method for heating and pre-cambering deck T-beams according to claim 1, characterized in that, The electromagnetic heating device (3) is equipped with a current regulator and a control switch.

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