Method and device for detecting tension of lifting driving steel cable of flexible gate of ship painting workshop

Abstract

The invention discloses a ship painting workshop flexible gate lifting driving steel cable tension detection method and device, and the method comprises the steps: enabling an opening angle tool to be disposed at one side of a lifting driving steel cable, and enabling a tensioner to be disposed at one side, opposite to the opening angle tool, of the lifting driving steel cable; then the tensioner is horizontally pulled towards the direction deviating from the field angle tool to pull the lifting driving steel cable to be bent, the tension of the lifting driving steel cable can be rapidly detected, and the problems that a traditional detection method is inconvenient to operate, low in precision and high in detection efficiency are effectively solved. The device solves the problems of large size, heavy weight, special and complex coating production measurement environment and many interferences in the prior art, and greatly improves the working efficiency and safety of the detection of the tension (angle) force of the flexible gate lifting drive steel cable in the painting workshop.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and particularly relates to a method and device for detecting the tension of a lifting drive cable of a flexible door in a ship painting workshop. Background Art

[0002] With the economic recovery of the shipbuilding industry, the volume of segmented objects entering and leaving the ship painting workshop has increased, and the opening and closing of the flexible door are extremely frequent. An important factor affecting the safety and efficiency of the opening and closing of the flexible door is the tension of the lifting drive cable. Uneven tension of the lifting drive cable will cause the flexible door to vibrate during lifting and lowering, and will also cause wear of the cable and the guide pulley, reducing the safety factor of the opening and closing of the flexible door.

[0003] At present, the main methods for testing the tension of the lifting drive cable of the flexible door are the spring scale force measurement method and the electronic tension meter method. The spring scale force measurement method needs to control two physical quantities, distance and tension, at the same time, which is inconvenient to operate and has low measurement accuracy; while the electronic tension meter method is large in volume and heavy in weight, and is easy to interfere with the cable, the flexible door track or equipment, and is inconvenient to operate in the complex environment of the painting site. Based on the current situation that there are many flexible doors in the painting workshop, the number of maintenance and inspection personnel is insufficient every year, and the contradiction between man and machine is prominent, the tension (angle) of the lifting drive cable is crucial for the safe and efficient operation of the flexible door. There is an urgent need for a device for detecting the tension (angle) of the lifting drive cable of the flexible door in the painting workshop, which is small in structure, easy to carry, high in precision. Summary of the Invention

[0004] In view of this, the present invention provides a method and device for detecting the tension of a lifting drive cable of a flexible door in a ship painting workshop to solve the problems existing in the above background art.

[0005] A method for detecting the tension of a lifting drive cable of a flexible door in a ship painting workshop specifically includes the following steps:

[0006] S1, install the tension detection device on one of the lifting drive cables of the flexible door in the painting workshop;

[0007] The tension detection device includes an angle-forming tooling arranged on one side of the lifting drive cable and a tensioner arranged on the opposite side of the lifting drive cable to the angle-forming tooling. The angle-forming tooling includes an upper rotating rod and a lower rotating rod. Fixed sleeves for fixing the angle-forming tooling on the lifting drive cable are fixed at the upper end of the upper rotating rod and the lower end of the lower rotating rod. The lower end of the upper rotating rod is rotatably connected to the upper end of the lower rotating rod through a rotating shaft. One end of the rotating shaft is provided with an angle detection unit for detecting the angle of the angle-forming tooling when the lifting drive cable is bent. A torsion spring is arranged on the rotating shaft. One end of the torsion spring is fixed to the upper rotating rod and the other end is fixed to the lower rotating rod. A rotating stop is arranged at the lower part of the side of the upper rotating rod facing the tensioner;

[0008] The tensiometer is hooked on the lifting drive steel cable between the upper and lower fixed sleeve rods. The tensiometer is used to detect and display the bending tension of the lifting drive steel cable, and display the opening angle of the opening angle tooling and the number of unqualified steel cables.

[0009] S2. Hold the tensiometer, input the steel cable number of the current lifting drive steel cable on the tensiometer, and then horizontally pull the tensiometer in the direction away from the opening angle tooling to pull the lifting drive steel cable. When the lifting drive steel cable bends, it forces the opening angle tooling to bend in the same direction by the same angle to form an opening angle. When the opening angle of the opening angle tooling displayed on the tensiometer reaches the set value, stop pulling the tensiometer, and the tensiometer automatically detects and stores the tension value of the lifting drive steel cable at this time.

[0010] S3. Release the pulling force on the tensiometer. Under the action of the torsion spring, the opening angle tooling resets and returns to the state where the initial upper rotating rod and the lower rotating rod form an included angle of 180°.

[0011] S4. Repeat steps S1 and S2, install the tension detection device on the lifting drive steel cables of all flexible doors in the spraying workshop in turn, measure the tension values of each lifting drive steel cable at the same opening angle in turn. After the measurement is completed, the tensiometer respectively judges whether the safety of opening and closing of each flexible door meets the requirements according to the tension values of each lifting drive cable stored in it.

[0012] Preferably, the specific steps for the tensiometer to respectively judge whether the safety of opening and closing of each flexible door meets the requirements according to the tension values of each lifting drive cable stored in it in step S4 are as follows:

[0013] The tensiometer respectively calculates the average tension value of each lifting drive cable on each flexible door, and judges whether the deviation between the average tension value and the standard value is greater than 5%. If it is greater, the safety of opening and closing of the flexible door does not meet the requirements, and the number of unqualified steel cables is displayed on its display screen.

[0014] Preferably, the upper rotating rod and the lower rotating rod have the same structure, and both include two vertically arranged rods, a first connecting piece fixed at one end of the two vertically arranged rods, and a second connecting piece connected between the two vertically arranged rods. The fixed sleeve rod is vertically connected to the first connecting piece and is in the same plane as the first connecting piece.

[0015] Preferably, the fixed sleeve rod includes a fixed connection part and a clamping sleeve part arranged at the end of the fixed connection part.

[0016] Preferably, the clamping sleeve part is an arc-shaped plate, or the clamping sleeve part is a hoop.

[0017] Preferably, the tensiometer includes a tension collector for detecting the bending tension of the lifting drive steel cable, an A / D conversion module for converting the analog signal output by the tension collector into a digital signal, a processor for processing the tension digital signal output by the A / D conversion module and the opening angle of the opening angle tool detected by the angle detection unit, a display screen, an alarm, and input keys. The signal output end of the tension collector is connected to the signal input end of the A / D conversion module. The signal output ends of the A / D conversion module and the angle detection unit are both connected to the signal input end of the processor. The signal output end of the processor is connected to the display screen and the alarm. The signal output end of the input keys is connected to the signal input end of the processor.

[0018] Preferably, in step S2, when the opening angle of the opening angle tool displayed on the tensiometer reaches the set value, stop pulling the tensiometer. The tension collector detects the bending tension of the lifting drive steel cable at this time and transmits the detected tension signal to the processor through the A / D conversion module. The processor compares the received data with the set value. If it is less than the set value, it controls the alarm to give an alarm prompt, controls the display screen to display the tension value, and stores the tension value and the corresponding cable number at the same time.

[0019] Preferably, the tension collector is a cantilever beam type sensor;

[0020] The angle detection unit is a non-contact magnetic encoder with an angle resolution < 0.1°.

[0021] Preferably, the ship painting workshop is provided with a plurality of flexible doors, and a lifting drive steel cable is provided on both sides of each flexible door.

[0022] A device for detecting the tension of a lifting drive steel cable of a flexible door in a ship painting workshop includes an opening angle tool arranged on one side of the lifting drive steel cable and a tensiometer arranged on the opposite side of the lifting drive steel cable to the opening angle tool. The opening angle tool includes an upper rotating rod and a lower rotating rod. Fixed sleeves for fixing the opening angle tool on the lifting drive steel cable are fixed at the upper end of the upper rotating rod and the lower end of the lower rotating rod. The lower end of the upper rotating rod is rotatably connected to the upper end of the lower rotating rod through a rotating shaft. An angle detection unit for detecting the opening angle of the opening angle tool when the lifting drive steel cable bends is arranged at one end of the rotating shaft. A torsion spring is arranged on the rotating shaft. One end of the torsion spring is fixed to the upper rotating rod and the other end is fixed to the lower rotating rod. A rotating stop is arranged at the lower part of the side of the upper rotating rod facing the tensiometer;

[0023] The tensiometer is hooked on the lifting drive steel cable between the upper and lower fixed sleeves. The tensiometer is used to detect the bending tension of the lifting drive steel cable and display it, and display the opening angle size of the opening angle tool and the number of unqualified steel cables.

[0024] The beneficial effects of the present invention are:

[0025] 1. The lifting drive steel cable tension detection device of the present invention has a simple structure, convenient operation, high efficiency and high precision. It can easily handle the problem of tension (angle) inspection of the lifting drive steel cable of the flexible door in the ship painting workshop. It has low requirements for the operation of the inspection workers, simple tooling equipment, high flexibility, good safety, and is convenient for on-site inspection and correction in the production. It solves the problems of inconvenient operation and low precision of the traditional detection method, the large volume and heavy weight of the equipment used, and the special, complex and interference-prone painting production measurement environment, greatly improving the work efficiency and safety of the tension (angle) detection of the lifting drive steel cable of the flexible door in the painting workshop.

[0026] 2. The present invention reduces the repeated calibration process and manpower input for the tension (angle) inspection of the lifting drive steel cable of the flexible door in the painting workshop, and improves the work efficiency of on-site steel cable tension detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic diagram of the measurement state of the lifting drive steel cable tension detection device.

[0029] Figure 2 It is a schematic diagram of the initial state of the angle-opening tooling.

[0030] Figure 3 It is a circuit principle block diagram of the tensioner.

[0031] Figure 4 It is a schematic diagram of the structure of the upper rotating rod or the lower rotating rod.

[0032] Figure 5 It is a schematic diagram of the structure of the fixed sleeve rod.

[0033] The meanings of the reference numerals in the drawings are as follows:

[0034] 1 is the angle-opening tooling, 2 is the tensioner, 3 is the upper rotating rod, 4 is the lower rotating rod, 5 is the rotating shaft, 6 is the fixed sleeve rod, 7 is the torsion spring, 8 is the angle detection unit, 9 is the rotation stop, 10 is the vertical rod, 11 is the first connecting member, 12 is the second connecting member, 13 is the fixed connection part, 14 is the clamping sleeve part, and 15 is the lifting drive steel cable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] To make the objectives, technical solutions and advantages of the present invention clearer and more explicit, the present invention will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0036] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "said" and "the" used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0037] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0038] The present invention provides a device for detecting the tension of a lifting drive steel cable of a flexible door in a ship spraying workshop, which includes an angle-forming tooling 1 arranged on one side of the lifting drive steel cable and a tensioner 2 arranged on the opposite side of the lifting drive steel cable to the angle-forming tooling 1.

[0039] The angle-forming tooling 1 is used to reflect the magnitude of the angle formed when the lifting drive steel cable bends. When the lifting drive steel cable bends, the angle-forming tooling 1 will also generate an angle with the same bending amplitude or angle in the same direction.

[0040] Specifically, the angle-forming tooling 1 includes an upper rotating rod 3 and a lower rotating rod 4. Fixed sleeves 6 for fixing the angle-forming tooling 1 on the lifting drive steel cable are respectively fixed at the upper end of the upper rotating rod 3 and the lower end of the lower rotating rod 4. The lower end of the upper rotating rod 3 is rotationally connected to the upper end of the lower rotating rod 4 through a rotating shaft 5, that is, the upper rotating rod 3 and the lower rotating rod 4 cooperate with the rotating shaft 5 to form a rotating pair.

[0041] The upper rotating rod 3 and the lower rotating rod 4 have the same structure, and both include two vertical rods 10 arranged oppositely, a first connecting member 11 fixed at one end of the two vertical rods 10, and a second connecting member 12 connected between the two vertical rods 10. A shaft hole is provided at the end of the vertical rod 10 close to the second connecting member 12. The fixed sleeve 6 is perpendicularly connected to the first connecting member 11 and is in the same plane as the first connecting member 11.

[0042] When rotating the upper rotating rod 3 and the lower rotating rod 4 during assembly, the end of the upper rotating rod 3 with a shaft hole is clamped outside the end of the lower rotating rod 4 with a shaft hole, and the shaft holes of the two are aligned. Then, a rotating shaft is passed through the shaft holes of the upper rotating rod 3 and the lower rotating rod 4. A clearance fit is formed between the rotating shaft 5 and the shaft hole of the upper rotating rod 3, and an interference fit is formed between the rotating shaft 5 and the shaft hole of the lower rotating rod 4. The upper rotating rod 3 and the lower rotating rod 4 can rotate around the rotating shaft 5. In this embodiment, the rotating shaft 5 is a rotating pin shaft.

[0043] One end of the rotating shaft 5 is provided with an angle detection unit 8 for detecting the included angle of the angle of the tensioning tool 1 when the lifting drive steel cable is bent. A torsion spring 7 is provided on the rotating shaft 5. One end of the torsion spring 7 is fixed to the upper rotating rod 3, and the other end is fixed to the lower rotating rod 4. A rotating stop 9 is provided at the lower part of the side of the upper rotating rod 3 facing the tensioner 2. The initial included angle between the upper rotating rod 3 and the lower rotating rod 4 is 180°, that is, the upper rotating rod 3 and the lower rotating rod 4 are in the same plane. When the upper rotating rod 3 and the lower rotating rod 4 are forced to rotate around the rotating shaft 5 to form a certain included angle, since both ends of the torsion spring 7 are fixed to the upper rotating rod 3 and the lower rotating rod 4 respectively, when an acute included angle as shown in Figure 1 is formed between the upper rotating rod 3 and the lower rotating rod 4, the upper rotating rod 3 and the lower rotating rod 4 will compress the torsion spring 7, and the torsion spring 7 is compressed. When the force applied to the upper rotating rod 3 and the lower rotating rod 4 disappears, under the action of the elastic force of the torsion spring 7, the upper rotating rod 3 and the lower rotating rod 4 will rotate in opposite directions, so as to return to the initial position. A rotating stop 9 is provided on the upper rotating rod 3. Therefore, during the reset rotation process, when the lower rotating rod 4 rotates in the reverse direction and contacts the rotating stop 9, the rotating stop 9 will block the further rotation of the lower rotating rod 4, playing a limiting role, so that the upper rotating rod 3 and the lower rotating rod 4 stop rotating when they return to the initial position.

[0044] The angle detection unit 8 is used to collect the rotation angle between the upper rotating rod 3 and the lower rotating rod 4. In this embodiment, the angle detection unit 8 adopts a non-contact magnetic encoder. Preferably, a high-digit non-contact magnetic encoder can be adopted, with an angle resolution <0.1°. Its rotating bipolar magnet is fixed at one end of the rotating shaft 5, and the center of its encoder chip is located on the axis of the rotating shaft 5.

[0045] A first connecting member 11 is perpendicularly connected to the fixed sleeve rods 6 of the upper rotating rod 3 and the lower rotating rod 4, and the fixed sleeve rods 6 and the first connecting member 11 are in the same plane.

[0046] The fixed sleeve rod 6 includes a fixed connection part 13 and a clamping sleeve part 14 arranged at the end of the fixed connection part 13. The fixed connection part 13 is fixedly welded to the first connecting piece 11, and the clamping part 14 is used to fix the entire angle-opening tooling 1 on the lifting drive steel cable. The clamping sleeve part 14 can be designed as an arc-shaped plate, or the clamping sleeve part 14 can be designed as a hoop. In this embodiment, the clamping sleeve part 14 is an arc-shaped plate.

[0047] The angle-opening tooling 1 is clamped on the lifting drive steel cable by two upper and lower fixed sleeve rods 6.

[0048] The tensioner 2 is hooked on the lifting drive steel cable between the two upper and lower fixed sleeve rods 6, and the tensioner 2 is located at the middle position between the two upper and lower fixed sleeve rods 6. The tensioner 2 is used to detect the bending tension of the lifting drive steel cable and display it, and display the angle size of the angle-opening tooling 1 and the number of unqualified steel cables.

[0049] The measuring range of the tension of the tensioner 2 can reach 400 N, and the measuring accuracy is ≤ 2%. It includes a tension collector, an A / D conversion module, a processor, a display screen, an alarm and an input button. The tension collector, A / D conversion module, processor, display screen, alarm and input button are arranged in the housing. One end of the housing is provided with a handle, and the other end is provided with a hook.

[0050] The tension collector is used to detect the bending tension of the lifting drive steel cable and transmit the detected tension data to the A / D conversion module. The signal output end of the tension collector is connected to the signal input end of the A / D conversion module. In this embodiment, the tension collector is a cantilever beam type sensor.

[0051] The A / D conversion module is used to convert the analog signal output by the tension collector into a digital signal and transmit the converted data to the processor. The signal output end of the A / D conversion module is connected to the signal input end of the processor. In order to improve the conversion accuracy of the A / D conversion module and simplify the circuit while amplifying the tension voltage signal, in this embodiment, a 24-bit A / D dual-channel programmable gain conversion chip with a gain of 64 or 128 is selected, and an appropriate gain can be selected according to the amplitude of different differential input signals; this conversion chip has a fast response speed and strong anti-interference ability, and an internal integrated voltage stabilizer power supply and a clock oscillator can be directly used as the excitation voltage of the cantilever beam sensor.

[0052] The processor is used to process the tension digital signal output by the A / D conversion module, judge whether the tension of the lifting drive steel cable under a certain angle state meets the requirements. If not, it can control the alarm (buzzer) to give an alarm prompt and display the tension value and the steel cable number of the lifting drive steel cable whose tension does not meet the requirements on the display screen; at the same time, it can also receive the angle of the angle-opening tooling 1 detected by the angle detection unit 8 and process the angle signal, and control the display screen to display the angle value.

[0053] The processor can also receive the signals sent by the input button, and the user can input the cable number of the lifting drive cable being detected through the input button.

[0054] The signal output end of the tension collector is connected to the signal input end of the A / D conversion module, the signal output ends of the A / D conversion module and the angle detection unit 8 are both connected to the signal input end of the processor, the signal output end of the processor is connected to the display screen and the alarm, and the signal output end of the input button is connected to the signal input end of the processor.

[0055] In this embodiment, the processor uses a 16-bit signal processor with high-speed computing activities. It is an efficient chip processor integrating the functions of a single-chip microcomputer and digital signal processing. The instruction execution speed is ≥20MIPS. This processor has multiple peripheral change notice (CN) pins and has the ability of fast interrupt processing. The input button can be connected to the change notice (CN) pin. When the input button is pressed, the level on the change notice (CN) pin changes, and the change notice (CN) pin sends an interrupt request to the processor to execute the corresponding program; and this processor can provide multiple 16-bit timers, and select to pair the 16-bit timers to form a 32-bit timing module. The 32-bit timing module is used to control the dynamic display mode of the display screen to control the display refresh frequency; this processor has multiple external interrupt sources, and each external interrupt source has multiple user-selectable priorities and I / O port multiplexing functions, which can provide rich configurations for the A / D conversion module and the buzzer.

[0056] In this embodiment, the display screen uses a 4-digit digital tube LED display module, which has 4-bit serial chip drive, 4-bit common anode connection method, occupies 3 I / O ports of the processor, has a large drive current, and can be easily formed into a dynamic display.

[0057] The present invention also provides a method for detecting the tension of the lifting drive cable of the flexible door in the ship painting workshop. This method uses the above device to detect the lifting drive cable, and specifically includes the following detection steps:

[0058] S1, Install the tension detection device on one of the lifting drive cables of the flexible door in the painting workshop;

[0059] The angle fixture 1 is fixed on one side of the lifting drive cable through its fixed sleeve rod 6, and the tensioner 2 is hooked on the opposite side of the lifting drive cable to the angle fixture 1 through its hook. The tensioner 2 is located at the middle position between the upper and lower fixed sleeve rods 6.

[0060] S2, Hold the tensioner 2, input the cable number of the current lifting drive cable on the tensioner 2, and then horizontally pull the tensioner 2 in the direction away from the angle fixture 1 to pull the lifting drive cable, asFigure 1 As shown in the figure, when the tensioner 2 is pulled horizontally to the right, the tensioner 2 bends. During the process of the lifting drive cable bending, the lifting drive cable transfers the bending pressure from the connection position between it and the angle setting tool 1 to the fixed sleeve rod 6. The upper and lower fixed sleeve rods 6 then transfer the pressure to the upper rotating rod 3 and the lower rotating rod 4, causing the tensioner 2 to bend in the same direction by the same angle, so that an angle is formed between the upper rotating rod 3 and the lower rotating rod 4.

[0061] During the rotation of the upper rotating rod 3 and the lower rotating rod 4, the angle detection unit 8 will detect the angle between the upper rotating rod 3 and the lower rotating rod 4 in real time, and transfer the angle to the processor of the tensioner 2, and then display it on the display screen in real time;

[0062] When the angle of the angle setting tool 1 shown on the tensioner 2 reaches the set value, stop pulling the tensioner 2. The tension collector detects the bending tension of the lifting drive cable at this time and transmits the detected tension signal to the processor through the A / D conversion module. The processor compares the received data with the set value. If it is less than the set value, it controls the alarm to give an alarm prompt, controls the display screen to display the tension value, and the steel cable number of the lifting drive cable being detected will also be displayed on the display screen. At the same time, the processor will also store the tension value and the corresponding steel cable number.

[0063] S3. Release the tension on the tensioner 2. Under the action of the torsion spring 7, the angle setting tool 1 resets and returns to the initial state where the upper rotating rod 3 and the lower rotating rod 4 form an angle of 180°.

[0064] S4. Repeat steps S1 and S2, install the tension detection device on the lifting drive cables of all flexible doors in the ship painting workshop in turn, measure the tension values of each lifting drive cable at the same angle in turn. After the measurement, the tensioner 2 judges whether the safety of the opening and closing of each flexible door meets the requirements according to the stored tension values of each lifting drive cable. That is, the tensioner 2 calculates the average tension value of the lifting drive cables of each flexible door according to the tension values of the lifting drive cables of each flexible door (for example, if there are two lifting drive cables on flexible door A, then according to the tension values of these two lifting drive cables detected in the above steps at the same set angle, calculate the average value, and this average value is the average tension value of the lifting drive cables of this flexible door), and judges whether the deviation between the average tension value and the standard value is greater than 5%. If it is greater, the safety of the opening and closing of this flexible door does not meet the requirements, and the unqualified steel cable number will be displayed on its display screen.

[0065] It should be noted that there are multiple flexible doors in the ship painting workshop, and there is a lifting drive cable on both sides of each flexible door.

[0066] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts belong to the scope of protection of the present invention.

Claims

1. A method for detecting the tension of a lifting drive cable of a flexible door in a ship spraying workshop, characterized in that: The specific steps include: S1, install the tension detection device on one of the lifting drive cables of the flexible door of the spraying workshop; The tension detection device comprises an angle-expanding tool (1) arranged on one side of the lifting drive steel cable, and a tensioner (2) arranged on the side of the lifting drive steel cable opposite to the angle-expanding tool (1). The angle-expanding tool (1) comprises an upper rotating rod (3) and a lower rotating rod (4). The upper end of the upper rotating rod (3) and the lower end of the lower rotating rod (4) are both fixed with a fixing sleeve rod (6) for fixing the angle-expanding tool (1) on the lifting drive steel cable. The lower end of the upper rotating rod (3) is fixed with a fixing sleeve rod (6) for fixing the angle-expanding tool (1) on the lifting drive steel cable. The upper end of the lower rotating rod (4) is rotatably connected to the upper end of the lower rotating rod (4) through a rotating shaft (5); one end of the rotating shaft (5) is provided with an angle detection unit (8) for detecting the angle of the angle tooling (1) when the lifting drive cable is bent; a torsion spring (7) is provided on the rotating shaft (5); one end of the torsion spring (7) is fixed to the upper rotating rod (3) and the other end is fixed to the lower rotating rod (4); a rotating stopper (9) is provided at the lower part of the upper rotating rod (3) on the side facing the tensioner (2); The tensioner (2) is hooked on the lifting drive steel cable between the upper and lower fixed sleeve rods (6). The tensioner (2) is used to detect the bending tension of the lifting drive steel cable and display it, and also displays the angle of the angle tooling (1) and the number of the unqualified steel cable; S2, holding the tensioner (2), inputting the cable number of the current lifting drive cable on the tensioner (2), then pulling the tensioner (1) horizontally in the direction away from the angle-opening tooling (1) to pull the lifting drive cable, and while the lifting drive cable is bent, the angle-opening tooling (1) is forced to bend in the same direction at the same angle to form an angle-opening, and when the angle-opening tooling (1) displayed on the tensioner (2) reaches the set value, stop pulling the tensioner (2), and the tensioner (2) automatically detects and stores the tension value of the lifting drive cable at this time; S3, releasing the tension on the tensioner (2), and under the action of the torsion spring (7), the angle-opening tooling (1) is reset to the initial state where the upper rotating rod (3) and the lower rotating rod (4) form an angle of 180°; S4, repeating steps S1 and S2, installing the tension detection device on the lifting drive cables of all the flexible doors of the spraying workshop in turn, and measuring the tension value of each lifting drive cable at the same angle in turn. After the measurement is completed, the tensioner (2) judges whether the safety of opening and closing each flexible door meets the requirements according to the tension value of each lifting drive cable stored in it.

2. The method for detecting the tension of the lifting drive cable of the flexible door of a ship spraying workshop according to claim 1 is characterized in that: In step S4, the specific steps of the tensioner (2) judging whether the safety of opening and closing of each flexible gate switch meets the requirements according to the tension values ​​of each lifting drive cable stored therein are: The tensioner (2) calculates the average tension of each lifting drive cable on each flexible gate, and determines whether the deviation between the average tension and the standard value is greater than 5%. If so, the safety of the flexible gate opening and closing does not meet the requirements, and the number of the unqualified steel cable is displayed on its display screen.

3. The method for detecting the tension of the lifting drive cable of the flexible door of a ship spraying workshop according to claim 1 is characterized in that: The upper rotating rod (3) and the lower rotating rod (4) have the same structure, and both comprise two vertical rods (10) arranged opposite to each other, a first connecting member (11) fixed to one end of the two vertical rods (10), and a second connecting member (12) connected between the two vertical rods (10); a fixed sleeve rod (6) is vertically connected to the first connecting member (11) and is located in the same plane as the first connecting member (11).

4. The method for detecting the tension of the lifting drive cable of the flexible door of a ship spray painting workshop according to claim 1 or 3, characterized in that: The fixed sleeve rod (6) comprises a fixed connection portion (13) and a clamping sleeve portion (14) arranged at the end of the fixed connection portion (13).

5. The method for detecting the tension of the lifting drive steel cable of the flexible door of a ship spraying workshop according to claim 4 is characterized in that: The clamping sleeve part (14) is in the shape of an arc plate, or the clamping sleeve part (14) is a clamping hoop.

6. The method for detecting the tension of the lifting drive cable of the flexible door of a ship spraying workshop according to claim 1 is characterized in that: The tensioner (2) comprises a tension collector for detecting the bending tension of the lifting drive steel cable, an A / D conversion module for converting an analog signal output by the tension collector into a digital signal, a processor for processing the tension digital signal output by the A / D conversion module and the angle of the angle tooling (1) detected by the angle detection unit (8), a display screen, an alarm, and an input button. The signal output end of the tension collector is connected to the signal input end of the A / D conversion module, the signal output end of the A / D conversion module and the signal output end of the angle detection unit (8) are both connected to the signal input end of the processor, the signal output end of the processor is both connected to the display screen and the alarm, and the signal output end of the input button is connected to the signal input end of the processor.

7. The method for detecting the tension of the lifting drive cable of the flexible door of a ship spraying workshop according to claim 6 is characterized in that: In step S2, when the tensioning angle of the tensioning tool (1) displayed on the tensioner (2) reaches the set value, the tensioner (2) is stopped from being pulled, and the tension collector detects the bending tension of the lifting drive steel cable at this time and transmits the detected tension signal to the processor through the A / D conversion module. The processor compares the received data with the set value. If it is less than the set value, the alarm is controlled to issue an alarm prompt, the display screen is controlled to display the tension value, and the tension value and the corresponding steel cable number are stored at the same time.

8. The method for detecting the tension of the lifting drive cable of the flexible door of a ship spraying workshop according to claim 5 is characterized in that: The tension collector is a cantilever beam sensor; The angle detection unit (8) is a contactless magnetic encoder, and its angle resolution is less than 0.1°.

9. The method for detecting the tension of the lifting drive cable of the flexible door of a ship spraying workshop according to claim 1 is characterized in that: The ship spraying workshop is provided with a plurality of flexible doors, and a lifting driving steel cable is provided on both sides of each flexible door.

10. A device for detecting the tension of a steel cable driving a lifting drive for a flexible door of a ship spraying workshop, characterized in that: The invention comprises an angle-expanding tool (1) arranged on one side of a lifting drive steel cable, and a tensioner (2) arranged on the side of the lifting drive steel cable opposite to the angle-expanding tool (1). The angle-expanding tool (1) comprises an upper rotating rod (3) and a lower rotating rod (4). The upper end of the upper rotating rod (3) and the lower end of the lower rotating rod (4) are both fixed with a fixing sleeve rod (6) for fixing the angle-expanding tool (1) on the lifting drive steel cable. The lower end of the upper rotating rod (3) is fixed by a rotating rod The movable shaft (5) is rotatably connected to the upper end of the lower rotating rod (4); one end of the rotating shaft (5) is provided with an angle detection unit (8) for detecting the angle of the angle tooling (1) when the lifting drive cable is bent; a torsion spring (7) is provided on the rotating shaft (5); one end of the torsion spring (7) is fixed to the upper rotating rod (3) and the other end is fixed to the lower rotating rod (4); a rotation stopper (9) is provided at the lower part of the upper rotating rod (3) facing the tensioner (2); The tensioner (2) is hooked on the lifting drive steel cable between the upper and lower fixed sleeve rods (6). The tensioner (2) is used to detect the bending tension of the lifting drive steel cable and display it, and also displays the angle of the angle tooling (1) and the number of the unqualified steel cable.

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