A large ship hatch coaming welding anti-deformation monitoring tool and monitoring method

Abstract

The present invention discloses a large-scale ship hatch coaming welding anti-deformation monitoring tool and monitoring method, including a wire puller for monitoring the straightness of the hatch coaming top plate for welding deformation in the hatch coaming segment production stage and the final assembly welding stage, the wire puller includes a pair of supports, a pull rope arranged between the pair of supports, the pair of supports includes a fixed support and a pulley support, one end of the pull rope is directly connected to the fixed support, a section of the rope body near the pulley support position on the pull rope is supported on the pulley of the pulley support, and the other end of the pull rope is tightened by a tensioning device; it is characterized in that the wire puller is a digital wire puller, the digital wire puller includes a number of digital display infrared rangefinders hung below the pull rope in an interval arrangement, and the ranging direction of the digital display infrared rangefinder is arranged vertically downward. The present invention improves the manufacturing accuracy of the hatch coaming and improves the efficiency of the hatch coaming welding operation.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to a large ship hatch coaming welding anti-deformation monitoring tool and a monitoring method. Background Art

[0002] The hatch coaming is an intermediate structure between the main deck and the hatch cover of a ship, and is often used on container ships and bulk carriers. One of the key points in the manufacture of hatch coamings is to strictly control the overall straightness of the hatch coaming top plate. If the top plate is not straight, it will affect the watertightness between the hatch cover plate and the hatch coaming, resulting in water leakage. The assembly and welding deformation of the hatch coaming during the manufacturing process are the main factors affecting the straightness of its top plate. In order to control the straightness of the hatch coaming top plate, it is necessary to detect and control the straightness of the top plate at various stages of the hatch coaming manufacturing (including the hatch coaming segment production stage and the final assembly and welding stage).

[0003] In the prior art, the overall straightness of the hatch coaming top plate is usually detected by pulling a steel wire. Specifically, a steel wire is pulled above the plane of the hatch coaming top plate to be detected, and the distance between the steel wire and the plane of the hatch coaming top plate is detected to determine whether the overall straightness of the hatch coaming top plate meets the requirements. However, the following problems exist:

[0004] First, the distance between the steel wire and the hatch coaming top plate plane is visually measured using a common steel ruler, which has a large error and poor accuracy. If an outside diameter micrometer is used for measurement, although the measurement accuracy can be improved, the measurement efficiency will be greatly reduced.

[0005] Secondly, when the hatch coaming is large, the steel wire is pulled longer, and due to its own weight, there will be a large overhang, thereby reducing the measurement accuracy.

[0006] Third, welding workers are required to temporarily interrupt welding operations, measure the overall straightness of the hatch coaming top plate at certain intervals, and determine whether it is out of tolerance, which greatly reduces the efficiency of welding operations. Summary of the invention

[0007] In order to solve the above problems, the present invention proposes a large ship hatch coaming welding anti-deformation monitoring tool and monitoring method, aiming to improve the manufacturing accuracy of the hatch coaming and improve the efficiency of the hatch coaming welding operation. The specific technical solution is as follows:

[0008] A large ship hatch coaming welding anti-deformation monitoring tool comprises a wire puller for monitoring the straightness of the hatch coaming top plate for welding deformation during the hatch coaming segment production stage and the final assembly welding stage, the wire puller comprises a pair of supports and a pull rope arranged between the pair of supports, the pair of supports comprises a fixed support and a pulley support, one end of the pull rope is directly connected to the fixed support, a section of the pull rope at the position of the pulley support is supported on the pulley of the pulley support, and the other end of the pull rope is tightened by a tensioning device; the wire puller is a digital wire puller, and the digital wire puller comprises a number of digital display infrared ranging pens hung below the pull rope in an interval arrangement, and the ranging direction of the digital display infrared ranging pens is arranged vertically downward.

[0009] As a preferred embodiment of the tensioning device in the present invention, the tensioning device is a weight connected to the other end of the pull rope, or the tensioning device is a pull rope tensioner connected to the other end of the pull rope; wherein the other end of the pull rope tensioner is connected to the bottom plate of the pulley support, and the pull rope tensioner is a pull rope tensioner with a digital tension indicator.

[0010] Preferably, the pull rope tensioner includes a digital tension indicator connected to the other end of the pull rope, a support plate horizontally arranged on the pulley support and located below the pulley, and a through hole opened on the support plate. The lower end of the shell of the digital tension indicator passes through the through hole of the support plate and is connected to a horizontal support plate. An annular rubber air ring is arranged between the support plate and the horizontal support plate, and an air intake pipe is arranged on the annular rubber air ring. The air intake pipe is connected to a hand-pinch inflatable ball through an inflatable hose, and an inflatable one-way valve and a manual deflation valve are respectively arranged on the inflatable hose.

[0011] In the present invention, the air intake pipe is fixed by a nut after passing through the mounting hole on the horizontal support plate.

[0012] The working principle of the above-mentioned drawstring tightener is: by pressing the hand-pinch inflatable ball, the annular rubber air ring can be inflated, and the gas enters the annular rubber air ring through the inflation check valve and expands the annular rubber air ring, thereby generating a squeezing force between the support plate and the horizontal support plate, and then generating a certain tension on the drawstring; when inflating, the magnitude of the tension is observed through the digital tension indicator to make it reach the set value. When the inflation is excessive, a certain amount of gas can be released through the manual deflation valve.

[0013] The above two tensioning devices can be selected according to the needs. When the detection length is long, in order to avoid the weight being too large, a rope tightener can be preferably used.

[0014] In order to facilitate the adjustment of the horizontal position of the pull rope, a further improvement scheme is: a T-shaped slot is arranged on the fixed support in the up and down directions, a pull rope fixing block is slidably arranged in the T-shaped slot and fixed by screws, and the pull rope is connected to the pull rope fixing block; a magnet plate is fixed on the bottom plate of the pair of supports by screws.

[0015] In the present invention, the digital display infrared distance measuring pen is provided with two measurement modes, the two measurement modes are absolute measurement mode and relative measurement mode; the absolute measurement mode refers to displaying the actual value of the measurement data on the display screen of the digital display infrared distance measuring pen in real time, and the relative measurement mode refers to taking the actual value of the current measurement data as the reference value, and then clearing the measurement data on the display screen, and in subsequent measurements, what is displayed on the display screen is the relative measurement value compared with the reference value, that is, the difference between the subsequent measurement data and the reference value; the two measurement modes are switched by a switching button.

[0016] In the present invention, the measurement mode of the digital display infrared distance measuring pen when it is just turned on is set to the absolute measurement mode by default.

[0017] In the present invention, a number of damping rubber sleeves are arranged on the pull rope, the damping rubber sleeves are tightly matched with the pull rope, an annular groove is provided in the middle of the outer circle of the damping rubber sleeve, and a hook is provided on the upper end of the digital display infrared rangefinder pen, and the hook is hung in the annular groove of the damping rubber sleeve.

[0018] Preferably, the damping rubber sleeve is a rubber sleeve.

[0019] Preferably, the damping rubber sleeve can be pulled along the pull rope to facilitate position adjustment.

[0020] As a further improvement of the present invention, a steel wire parallel to the pull rope is provided between the pair of supports and at a position below the pull rope and to one side, a magnet sheet is glued to the side surface of the shell of the digital display infrared rangefinder pen, and the side surface of the shell of the digital display infrared rangefinder pen is adsorbed on the steel wire through the magnet sheet.

[0021] A large ship hatch coaming welding anti-deformation monitoring tooling of the present invention is also provided with a real-time monitoring alarm device, which includes an MCU controller, a wireless transmission receiving module connected to the MCU controller, and an alarm connected to the MCU controller. The digital display infrared ranging pen is equipped with a built-in wireless transmission sending module, and each of the digital display infrared ranging pens realizes communication connection of measurement data with the MCU controller through the wireless transmission sending module, the wireless transmission receiving module and the MCU controller.

[0022] In the present invention, the switch button is arranged on each digital display infrared distance measuring pen to realize the switching of the measuring mode.

[0023] Preferably, a master control switch button may be separately provided on the MCU controller to achieve simultaneous switching of the measurement modes of the digital display infrared rangefinders.

[0024] A monitoring method for large ship hatch coaming welding anti-deformation monitoring tooling, characterized in that it comprises the following steps:

[0025] (1) Installation of the cable puller: The cable puller is pre-fixed and installed during the hatch coaming block production stage or the final assembly and welding stage, so that the cable puller is located above the hatch coaming top plate plane. The upper and lower positions of the cable puller fixing block are adjusted so that the cable puller is parallel to the reference installation plane. A number of digital display infrared rangefinder pens are hung on the damping rubber sleeve of the cable puller in an interval arrangement, and the tension of the cable puller is set by the tensioning device;

[0026] (2) Setting of measurement mode: Before welding, each digital infrared distance measuring pen is turned on. The digital infrared distance measuring pen enters the absolute measurement mode by default. The current actual measurement value is displayed on the screen of each digital infrared distance measuring pen. Check whether the data of each measuring point is within the allowable range. If necessary, perform shaping to ensure that the data of each measuring point is qualified. Then, switch the measurement mode to the relative measurement mode by switching the button. The current actual measurement value is cleared on the screen of each digital infrared distance measuring pen. Then, the digital infrared distance measuring pen dynamically monitors the deformation of the measuring point on the plane of the hatch coaming top plate in the up and down directions and displays the deformation in real time on the screen.

[0027] (3) Monitoring of welding and deformation: During the welding process, when the welding deformation of a certain monitoring point on the hatch coaming top plate plane in the up and down direction exceeds the preset threshold, the MCU controller will issue an alarm through the real-time monitoring alarm device to remind the welding operator to take corrective measures for welding;

[0028] Among them, the welding corrective measures include using two-person symmetrical welding, adding temporary welding anti-deformation support ribs or performing welding shaping.

[0029] As a preferred solution of the present invention, the wire puller is pre-compensated for the error of the wire rope sag through the MCU controller before use, and the method of comprehensive compensation for the error of the wire rope sag is as follows: the wire puller is installed on a reference plane, and each digital infrared rangefinder pen is turned on. By adjusting the upper and lower positions of the wire rope fixing block on the fixed support, the absolute values ​​of the measured data of the two digital infrared rangefinder pens at both ends of the wire rope are made consistent, the MCU controller obtains the absolute value of the measured data of each digital infrared rangefinder pen and compares it with the absolute value of the measured data of the digital infrared rangefinder pens at both ends of the wire rope, and the difference obtained is used as the comprehensive compensation value of the wire rope sag error; during formal measurement, the MCU controller compensates the comprehensive compensation value of the wire rope sag error to the actual measured value of each digital infrared rangefinder pen.

[0030] For example, when the distance from the reference plane measured by the digital infrared rangefinders at both ends of the rope is 100mm, and the distance from the reference plane measured by a digital infrared rangefinder in the middle of the rope is 97.5mm, the comprehensive compensation value of the rope sag error of the digital infrared rangefinder in the middle of the rope is 100mm-97.5mm=2.5mm. During the formal measurement, the MCU controller adds the compensation value of 2.5mm to the value measured by the digital infrared rangefinder to obtain the actual measured value after compensation.

[0031] In order to prevent misoperation, a pinhole button for comprehensive compensation of the pull rope suspension error is provided on the MCU controller. When turning on the comprehensive compensation of the pull rope suspension error, a special knitting needle needs to be used to press the pinhole button.

[0032] The beneficial effects of the present invention are:

[0033] First, a large ship hatch enclosure welding anti-deformation monitoring tool and monitoring method of the present invention adopts a specially designed digital wire puller, which can display and monitor the actual measurement data of each measurement point in real time, and improves the measurement efficiency and accuracy compared with the conventional wire pulling method.

[0034] Secondly, in the large ship hatch coaming welding anti-deformation monitoring tool and monitoring method of the present invention, each digital display infrared distance measuring pen can be quickly and conveniently removed from the pull rope and the steel wire, so as to be conveniently stored for use.

[0035] Thirdly, the present invention provides a large ship hatch enclosure welding anti-deformation monitoring tool and monitoring method, which can realize comprehensive compensation of the overhang error of the pull rope through the MCU controller, eliminate the overhang error, and thus improve the measurement accuracy.

[0036] Fourthly, the present invention provides a large ship hatch enclosure welding anti-deformation monitoring tool and monitoring method, which can be switched to a relative measurement mode by a switch button. In the relative measurement mode, the error in the suspension amount of the pull rope and other installation errors of the wire puller will not affect the measurement accuracy, thereby achieving real-time and accurate monitoring of the welding deformation and issuing an alarm when the tolerance is exceeded, making it convenient for welding operators to take welding corrective measures in time and saving a lot of measurement time for welding operators, thereby improving the efficiency of welding operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a large ship hatch coaming welding anti-deformation monitoring tooling of the present invention;

[0038] Figure 2 yes Figure 1 A partial enlarged view of the fixed support portion;

[0039] Figure 3 yes Figure 1 A partial enlarged view of the pulley support portion;

[0040] Figure 4 Yes Figure 1 A schematic diagram of the structure after the tensioning device (heavy hammer) is changed to a tensioning device (pull rope tightener);

[0041] Figure 5 yes Figure 4 A schematic diagram of the structure of the rope tightener part involved.

[0042] In the figure: 1. hatch coaming, 2. hatch coaming top plate, 3. wire puller, 4. pull rope, 5. fixed support, 6. pulley support, 7. tensioning device, 8. digital display infrared rangefinder, 9. heavy hammer, 10. pull rope tightener, 11. digital display tension indicator, 12. T-slot, 13. pull rope fixing block, 14. screw, 15. bottom plate, 16. magnet plate, 17. damping rubber sleeve, 18. annular groove, 19. hook, 20. steel wire, 21. magnet sheet, 22. pulley, 23. supporting plate, 24. horizontal support plate, 25. annular rubber air ring, 26. air inlet pipe, 27. hand-pinch inflatable ball, 28. inflating one-way valve, 29. manual deflation valve, 30. nut. DETAILED DESCRIPTION

[0043] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0044] Embodiment 1:

[0045] like Figures 1 to 5 The figure shows an embodiment of a large ship hatch coaming welding anti-deformation monitoring tooling of the present invention, comprising a wire puller 3 for monitoring the straightness of the hatch coaming top plate 2 for welding deformation during the hatch coaming 1 segment production stage and the final assembly welding stage, the wire puller 3 comprising a pair of supports and a pull rope 4 arranged between the pair of supports, the pair of supports comprising a fixed support 5 and a pulley support 6, one end of the pull rope 4 is directly connected to the fixed support 5, a section of the rope body on the pull rope 4 close to the pulley support 6 is supported on the pulley 22 of the pulley support 6, and the other end of the pull rope 4 is tightened by a tensioning device 7; the wire puller 3 is a digital wire puller, and the digital wire puller comprises a number of digital display infrared ranging pens 8 hung below the pull rope 4 in an interval arrangement, and the ranging direction of the digital display infrared ranging pens 8 is arranged vertically downward.

[0046] As a preferred embodiment of the tensioning device in this embodiment, the tensioning device 7 is a weight 9 connected to the other end of the pull rope 4, or the tensioning device 7 is a pull rope tensioner 10 connected to the other end of the pull rope 4; wherein the other end of the pull rope tensioner 10 is connected to the bottom plate 15 of the pulley support 6, and the pull rope tensioner 10 is a pull rope tensioner 10 with a digital tension indicator 11.

[0047] Preferably, the pull rope tensioner 10 includes a digital tension indicator 11 connected to the other end of the pull rope 4, a support plate 23 horizontally arranged on the pulley support 6 and located below the pulley 22, and a through hole opened on the support plate 23. The lower end of the shell of the digital tension indicator 11 passes through the through hole of the support plate 23 and is connected to a horizontal support plate 24. An annular rubber air ring 25 is arranged between the support plate 23 and the horizontal support plate 24. An air intake pipe 26 is arranged on the annular rubber air ring 25. The air intake pipe 26 is connected to a hand-pinch inflatable ball 27 through an inflatable hose, and an inflatable one-way valve 28 and a manual deflation valve 29 are respectively arranged on the inflatable hose.

[0048] In this embodiment, the air intake pipe 26 passes through the mounting hole on the horizontal support plate 24 and is fixed by a nut 30 .

[0049] The working principle of the above-mentioned drawstring tightener 10 is as follows: by pressing the hand-pinch inflatable ball 27, the annular rubber gas ring 25 can be inflated, and the gas enters the annular rubber gas ring 25 through the inflatable one-way valve 28 and expands the annular rubber gas ring 25, thereby generating a squeezing force between the support plate 23 and the horizontal support plate 24, and then generating a certain pulling force on the drawstring 4; during inflation, the magnitude of the pulling force is observed through the digital tension indicator 11 to make it reach the set value. When the inflation is excessive, a certain amount of gas can be released through the manual deflation valve 29.

[0050] The above two tensioning devices can be selected as needed. When the detection length is long, in order to avoid the weight 9 being too large, a rope tightener 10 can be preferably used.

[0051] In order to facilitate the adjustment of the horizontal position of the pull rope 4, a further improvement scheme is: a T-slot 12 is arranged on the fixed support 5 along the up and down directions, a pull rope fixing block 13 is slidably arranged in the T-slot 12 and fixed by screws 14, and the pull rope 4 is connected to the pull rope fixing block 13; a magnet plate 16 is fixed on the bottom plate 15 of the pair of supports 5 and 6 by screws 14.

[0052] In this embodiment, the digital display infrared rangefinder pen 8 is provided with two measurement modes, which are an absolute measurement mode and a relative measurement mode; the absolute measurement mode refers to displaying the actual value of the measurement data on the display screen of the digital display infrared rangefinder pen 8 in real time, and the relative measurement mode refers to taking the actual value of the current measurement data as the reference value, and then clearing the measurement data on the display screen, and in subsequent measurements, what is displayed on the display screen is the relative measurement value compared with the reference value, that is, the difference between the subsequent measurement data and the reference value; the two measurement modes are switched by a switch button.

[0053] In this embodiment, the measurement mode of the digital display infrared distance measuring pen 8 when it is just turned on is set to the absolute measurement mode by default.

[0054] In this embodiment, a number of damping rubber sleeves 17 are arranged on the pull rope 4, and the damping rubber sleeve 17 is tightly fitted with the pull rope 4. An annular groove 18 is provided in the middle of the outer circle of the damping rubber sleeve 17, and a hook 19 is provided at the upper end of the digital display infrared rangefinder pen 8, and the hook 19 is hung in the annular groove 18 of the damping rubber sleeve 17.

[0055] Preferably, the damping rubber sleeve 17 is a rubber sleeve.

[0056] Preferably, the damping rubber sleeve 17 can be pulled along the pull rope 4 to facilitate position adjustment.

[0057] As a further improvement of this embodiment, a steel wire 20 parallel to the pull rope 4 is provided between the pair of supports 5, 6 and at a position below the pull rope 4 and to one side. A magnet sheet 21 is glued to the side surface of the shell of the digital display infrared rangefinder pen 8, and the side surface of the shell of the digital display infrared rangefinder pen 8 is adsorbed on the steel wire 20 through the magnet sheet 21.

[0058] A large ship hatch enclosure welding anti-deformation monitoring tooling of the present embodiment is also provided with a real-time monitoring and alarm device, which includes an MCU controller, a wireless transmission receiving module connected to the MCU controller, and an alarm connected to the MCU controller. The digital display infrared ranging pen has a built-in wireless transmission sending module, and each of the digital display infrared ranging pens realizes communication connection of measurement data with the MCU controller through the wireless transmission sending module, the wireless transmission receiving module and the MCU controller.

[0059] In this embodiment, the switch button is provided on each digital display infrared distance measuring pen to realize the switching of the measuring mode.

[0060] Preferably, a master control switch button may be separately provided on the MCU controller to achieve simultaneous switching of the measurement modes of the digital display infrared rangefinders.

[0061] Embodiment 5:

[0062] A monitoring method for large ship hatch coaming welding anti-deformation monitoring tooling using embodiment 1 is characterized by comprising the following steps:

[0063] (1) Installation of the cable puller: The cable puller 3 is pre-fixed and installed during the block production stage or the final assembly and welding stage of the hatch coaming 1, so that the cable puller 4 is located above the plane of the hatch coaming top plate 2, and the upper and lower positions of the cable puller fixing block 13 are adjusted so that the cable puller 4 is parallel to the reference installation plane. A number of digital display infrared distance measuring pens 8 are hung on the damping rubber sleeve 17 of the cable puller 4 in an interval arrangement, and the tensioning force of the cable puller 4 is set by the tensioning device 7;

[0064] (2) Setting of measurement mode: Before welding, each digital infrared distance measuring pen 8 is turned on. The digital infrared distance measuring pen 8 enters the absolute measurement mode by default. The current actual measurement value is displayed on the display screen of each digital infrared distance measuring pen 8. Check whether the data of each measurement point is within the allowable range. If necessary, perform shaping to ensure that the data of each measurement point is qualified. Then, switch the measurement mode to the relative measurement mode by switching the button. The display screen of each digital infrared distance measuring pen 8 will clear the current actual measurement value. Then, the digital infrared distance measuring pen 8 dynamically monitors the deformation of the measurement point on the plane of the hatch coaming top plate 2 in the up and down directions and displays the deformation amount on the display screen in real time.

[0065] (3) Monitoring of welding and deformation: During the welding process, when the welding deformation of a certain monitoring point on the hatch coaming top plate 2 plane in the up-down direction exceeds a preset threshold, the MCU controller issues an alarm through the real-time monitoring alarm device to remind the welding operator to take corrective measures for welding;

[0066] Among them, the welding corrective measures include using two-person symmetrical welding, adding temporary welding anti-deformation support ribs or performing welding shaping.

[0067] As a preferred solution of this embodiment, the wire puller 3 is pre-compensated for the error of the rope suspension amount by the MCU controller before use, and the method of comprehensive compensation for the error of the rope suspension amount is as follows: the wire puller 3 is installed on the reference plane, and each digital display infrared rangefinder 8 is turned on, and the upper and lower positions of the rope fixing block 13 on the fixed support 5 are adjusted so that the absolute values ​​of the measured data of the two digital display infrared rangefinder pens 8 at both ends of the rope are consistent, and the MCU controller obtains the absolute value of the measured data of each digital display infrared rangefinder and compares it with the absolute value of the measured data of the digital display infrared rangefinder 8 at both ends of the rope, and the difference obtained is used as the comprehensive compensation value of the rope suspension amount error; during the formal measurement, the MCU controller compensates the comprehensive compensation value of the rope suspension amount error to the actual measurement value of each digital display infrared rangefinder 8.

[0068] For example, when the distance from the reference plane measured by the digital infrared rangefinder 8 at both ends of the rope 4 is 100mm, and the distance from the reference plane measured by a digital infrared rangefinder 8 in the middle of the rope 4 is 97.5mm, the comprehensive compensation value of the rope sag error of the digital infrared rangefinder 8 in the middle of the rope 4 is 100mm-97.5mm=2.5mm. During the formal measurement, the MCU controller adds the compensation value of 2.5mm to the value measured by the digital infrared rangefinder 8 to obtain the actual measured value after compensation.

[0069] In order to prevent misoperation, a pinhole button for comprehensive compensation of the pull rope suspension error is provided on the MCU controller. When turning on the comprehensive compensation of the pull rope suspension error, a special knitting needle needs to be used to press the pinhole button.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A large ship hatch coaming welding anti-deformation monitoring tool, comprising a wire puller for monitoring the straightness of the hatch coaming top plate for welding deformation during the hatch coaming segment production stage and the final assembly welding stage, the wire puller comprising a pair of supports and a pull rope arranged between the pair of supports, the pair of supports comprising a fixed support and a pulley support, one end of the pull rope is directly connected to the fixed support, a section of the pull rope near the pulley support is supported on the pulley of the pulley support, and the other end of the pull rope is tightened by a tensioning device; characterized in that The wire puller is a digital wire puller, which includes a number of digital infrared distance measuring pens hung below the pull rope in an interval arrangement, and the distance measuring direction of the digital infrared distance measuring pens is vertically downward; The tensioning device is a heavy hammer connected to the other end of the pull rope, or the tensioning device is a pull rope tightener connected to the other end of the pull rope; wherein the other end of the pull rope tightener is connected to the bottom plate of the pulley support, and the pull rope tightener is a pull rope tightener with a digital tension indicator; the pull rope tightener includes a digital tension indicator connected to the other end of the pull rope, a support plate horizontally arranged on the pulley support and located below the pulley, and a through hole opened on the support plate, and the lower end of the shell of the digital tension indicator is connected to a horizontal support plate after passing through the through hole of the support plate, and an annular rubber air ring is arranged between the support plate and the horizontal support plate, and an air intake pipe is arranged on the annular rubber air ring, and the air intake pipe is connected to a hand-pinch inflatable ball through an inflatable hose, and an inflatable one-way valve and a manual deflation valve are respectively arranged on the inflatable hose; The digital display infrared distance measuring pen is provided with two measurement modes, which are an absolute measurement mode and a relative measurement mode; the absolute measurement mode refers to displaying the actual value of the measurement data on the display screen of the digital display infrared distance measuring pen in real time, and the relative measurement mode refers to taking the actual value of the current measurement data as the reference value, and then clearing the measurement data on the display screen, and in subsequent measurements, the relative measurement value compared with the reference value is displayed on the display screen, that is, the difference between the subsequent measurement data and the reference value; the two measurement modes are switched by a switch button; A steel wire parallel to the pull rope is provided between the pair of supports and below the pull rope to one side. A magnet sheet is glued to the side surface of the shell of the digital display infrared distance measuring pen, and the side surface of the shell of the digital display infrared distance measuring pen is adsorbed on the steel wire through the magnet sheet.

2. A large ship hatch coaming welding anti-deformation monitoring tool according to claim 1, characterized in that: The fixed support is provided with a T-shaped slot along the up-down direction, a pull rope fixing block is slidably provided in the T-shaped slot and fixed by screws, and the pull rope is connected to the pull rope fixing block; a magnet plate is fixed on the bottom plate of the pair of supports by screws.

3. A large ship hatch coaming welding anti-deformation monitoring tool according to claim 1, characterized in that: A number of damping rubber sleeves are arranged on the pull rope, and the damping rubber sleeves are tightly matched with the pull rope. An annular groove is provided in the middle of the outer circle of the damping rubber sleeve. A hook is arranged on the upper end of the digital display infrared distance measuring pen, and the hook is hung in the annular groove of the damping rubber sleeve.

4. A large ship hatch coaming welding anti-deformation monitoring tool according to claim 3, characterized in that: The damping rubber sleeve is described as a rubber sleeve.

5. The large ship hatch coaming welding anti-deformation monitoring tool according to claim 1 is characterized in that: A real-time monitoring and alarm device is also provided, which includes an MCU controller, a wireless transmission receiving module connected to the MCU controller, and an alarm connected to the MCU controller. The digital display infrared rangefinder pen has a built-in wireless transmission sending module, and each of the digital display infrared rangefinder pens realizes communication connection of measurement data with the MCU controller through the wireless transmission sending module and the wireless transmission receiving module.

6. A monitoring method using the large ship hatch coaming welding anti-deformation monitoring tool according to any one of claims 1 to 5, characterized in that: The steps include: (1) Installation of the cable puller: The cable puller is pre-fixed and installed during the hatch coaming block production stage or the final assembly and welding stage so that the cable puller is located above the hatch coaming top plate plane. The upper and lower positions of the cable puller fixing block are adjusted so that the cable puller is parallel to the reference installation plane. A number of digital display infrared rangefinder pens are hung on the damping rubber sleeve of the cable puller in an interval arrangement, and the tension of the cable puller is set by the tensioning device. (2) Setting of measurement mode: Before welding, turn on each digital infrared distance measuring pen. The digital infrared distance measuring pen enters the absolute measurement mode by default. The current actual measurement value is displayed on the display screen of each digital infrared distance measuring pen. Check whether the data of each measuring point is within the allowable range. If necessary, perform shaping to ensure that the data of each measuring point is qualified. Then, the measurement mode is switched to the relative measurement mode by switching the button, and the display screen of each digital infrared distance measuring pen will clear the current actual measurement value. Then, the digital infrared distance measuring pen will dynamically monitor the deformation of the measuring point on the hatch coaming top plate plane in the up and down directions and display the deformation in real time on the display screen; (3) Monitoring of welding and deformation: During the welding process, when the welding deformation of a certain monitoring point on the hatch coaming top plate plane in the up and down directions exceeds the preset threshold, the MCU controller will issue an alarm through the real-time monitoring alarm device to remind the welding operator to take corrective measures for welding.

7. The monitoring method of a large ship hatch coaming welding anti-deformation monitoring tool according to claim 6 is characterized in that: The wire puller is pre-compensated for the error of the wire rope sag by the MCU controller before use. The method of the comprehensive compensation for the error of the wire rope sag is as follows: the wire puller is installed on a reference plane, each digital infrared rangefinder pen is turned on, and the upper and lower positions of the wire rope fixing block on the fixed support are adjusted so that the absolute values ​​of the measured data of the two digital infrared rangefinder pens at both ends of the wire rope are consistent. The MCU controller obtains the absolute value of the measured data of each digital infrared rangefinder pen and compares it with the absolute value of the measured data of the digital infrared rangefinder pens at both ends of the wire rope, and the difference obtained is used as the comprehensive compensation value of the wire rope sag error; during formal measurement, the MCU controller compensates the comprehensive compensation value of the wire rope sag error to the actual measured value of each digital infrared rangefinder pen.

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