Device and method for automatically measuring length of multiple chain ring groups of anchor chain

Abstract

The invention discloses a device and a method for automatically measuring the length of a plurality of chain rings of an anchor chain. The device comprises a laser probe module moving unit arranged at the upper part of the inner side of a longitudinal beam of an anchor chain tension tester and a laser probe module automatic measuring unit arranged above a plurality of chain ring groups of the anchor chain. The laser probe module moving unit comprises a stepping motor speed reducing unit, a mounting seat, a driving wheel, a driven wheel assembly and a transmission belt, and the laser probe module automatic measuring unit comprises a frame type tripod, a linear guide rail assembly, a laser probe module mounting plate and a plurality of laser probe modules. The measuring method comprises the steps of (1) vertical adjustment of the laser probe module, (2) zero position information collection of the first vertical ring of the anchor chain multi-chain-ring group, (3) position information collection of three groups of position information of the last vertical ring of the anchor chain multi-chain-ring group, and (4) completion of length measurement of the anchor chain multi-chain-ring group. According to the invention, the measurement precision and the measurement efficiency of the anchor chain multi-chain-ring group are obviously improved, and the labor intensity of length measurement of the anchor chain multi-chain-ring group is greatly reduced.

Description

Technical Field

[0001] This invention relates to a device for measuring the length of continuous links of an anchor chain on a horizontal anchor chain tensile testing machine, and particularly to a device and method for automatically measuring the length of multiple odd-numbered links of an anchor chain, belonging to the field of special length measurement technology. Background Technology

[0002] Marine anchor chains and mooring anchor chains (hereinafter collectively referred to as anchor chains) are important outfitting components related to the safety of ships and offshore oil drilling platforms, semi-submersible platforms, floating wind power platforms and other marine engineering projects. The anchor chain is raised and lowered through meshing transmission with the anchor winch and the anchor wheel. Therefore, it is necessary to measure the length of multiple links of the anchor chain to ensure that the length of multiple links of the anchor chain is within the allowable tolerance range, so as to avoid chain jumping or chain derailment accidents during the meshing transmission between the anchor chain and the anchor winch and the anchor wheel.

[0003] like Figure 1 As shown, according to the relevant provisions of the anchor chain specification, after the tensile test, the length of any group of five links in the anchor chain (hereinafter referred to as "five-link length") L5 = 5T (pitch) + 2d (chain diameter), and the manufacturing tolerance of the "five-link length" is +2.5%L5. The existing anchor chain "five-link length" is measured using a special caliper. During measurement, the fixed caliper and the movable caliper on the caliper rod are respectively placed against the outer sides of the first and last two links of the five links. Because the caliper rod is long and heavy, two people are required to lift and operate it. One person places the measuring face of the fixed caliper against the outermost side of the first link, while the other person pulls the movable caliper so that its measuring face is against the outermost side of the fifth link. After fixing the movable caliper, the two people lift out the caliper and then use a steel tape measure to measure the distance between the measuring faces of the two calipers. This distance is the length of the group of five links. This tooling and method for measuring the length of chain links in groups of five using calipers is an indirect measurement method, which has large measurement errors and is labor-intensive and cumbersome to operate. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic measuring device and method for the length of anchor chain multi-link groups that is convenient and quick to operate, has small measurement errors, and a high degree of automation.

[0005] This invention is achieved through the following technical solution:

[0006] An automatic measuring device for the length of multiple links in an anchor chain includes a laser probe module moving unit and a laser probe module automatic measuring unit. The laser probe module moving unit is located on the top of the inner side of a longitudinal beam in an anchor chain tensile testing machine, and the laser probe module automatic measuring unit is located above the multiple link group of the anchor chain in the anchor chain tensile testing machine.

[0007] The laser probe module moving unit includes a stepper motor reducer assembly, a mounting base, a drive wheel, a driven wheel assembly, and a transmission belt. One end of the horizontally positioned stepper motor reducer assembly is fixed to the outside of one side of the mounting base. The drive wheel is located inside the U-shaped mounting base and fixed to the output shaft of the stepper motor reducer assembly extending into one side of the mounting base. The bottom of the mounting base and the bottom of the driven wheel assembly are respectively fixed to the top plate of a longitudinal beam facing the anchor chain segment being measured. The bottom of the mounting base is adjacent to the clamping arm of the moving beam of the anchor chain tensile testing machine, and the bottom of the driven wheel assembly is adjacent to the clamping arm of the fixed beam of the anchor chain tensile testing machine. The drive wheel and the driven wheel are connected by a transmission belt, and both ends of the transmission belt are fixed to both sides of the connecting block via connecting seats.

[0008] The automatic measurement unit of the laser probe module includes a frame tripod, a linear guide rail assembly, a laser probe module mounting plate, and several laser probe modules. The linear guide rail assembly includes a slider and a guide rail body. The lower side of the guide rail body is supported on a guide rail body base arranged at intervals. The guide rail body base is supported on one end of a corresponding bracket. The other end of the bracket is welded and fixed to the upper part of the longitudinal beam. The slider is fastened to the upper side of the guide rail body. The lower side of the high end of the frame tripod is sequentially fixed to the upper side of the slider and the upper side of the connecting block. The laser probe module mounting plate is vertically movable and fixed to the lower end of the frame tripod. One end of the three horizontally spaced laser probe modules is fixed to the bottom of the laser probe module mounting plate through a laser probe module fixing base plate. The laser emission point of the central laser probe module is located above the longitudinal center line of the anchor chain tensile testing machine. The side laser probe modules are symmetrically arranged on both sides of the central laser probe module.

[0009] The objectives of this invention can also be further achieved through the following technical measures.

[0010] Furthermore, the passive wheel assembly includes a passive wheel mounting base, a passive wheel, a passive wheel axle, and two bushings. The passive wheel is fixed in the middle of the passive wheel axle, and both ends of the passive wheel axle are supported on the center of the passive wheel mounting base by bushings.

[0011] Furthermore, the transmission belt is a synchronous toothed belt, and both the driving pulley and the driven pulley are synchronous toothed pulleys with equal pitch circles.

[0012] Furthermore, the rated output torque of the stepper motor in the stepper motor reducer unit is 2.39 N·m.

[0013] Furthermore, the frame tripod is assembled from aluminum alloy profiles. The laser probe module mounting plate has a row of mounting holes arranged vertically on both sides. By screwing screws through the corresponding mounting holes into the bottom of the frame tripod, the laser probe module mounting plate is fixed to the bottom of the frame tripod according to the required vertical distance between the laser probe module and the anchor chain multi-link group.

[0014] Furthermore, the light source of the laser probe module is a red semiconductor laser with a wavelength of 655nm, and the bright spot range of the red semiconductor laser is Φ0.5mm.

[0015] Furthermore, the laser probe module's automatic measurement unit has an accuracy of 0.5 mm in detecting the length of the anchor chain multi-link group.

[0016] A method for measuring the length of an automatic anchor chain multi-link group using a device includes the following steps:

[0017] 1) After the anchor chain segment between a pair of moving beam clamping arms and a pair of fixed beam clamping arms of the anchor chain tensile testing machine has completed the tensile test, a tensile load of 10% is applied to the anchor chain segment to keep the anchor chain multi-link group in the anchor chain segment under tension.

[0018] 2) According to the chain diameter specifications of the multi-link group of the tested anchor chain, adjust the fixing position of the laser probe module mounting plate and the frame tripod so that the three laser probe modules are lowered and close to the multi-link group of the anchor chain respectively; then start the three laser probe modules respectively through the PLC controller so that the laser beams emitted by the three laser probe modules are perpendicular to the longitudinal axis of the vertical ring of the multi-link group of the tested anchor chain, thus completing the vertical adjustment of the laser probe modules;

[0019] 3) Start the stepper motor reducer unit. After receiving the pulse signal from the stepper motor driver, the stepper motor drives the drive wheel to rotate, which in turn drives the driven wheel to rotate synchronously through the transmission belt. This causes the connecting block to move the slider on the guide rail through the frame triangular bracket. The laser beams emitted by the three laser probe modules located on the upper side of the first vertical ring of the anchor chain multi-link group move towards the first vertical ring along the laser probe module mounting plate until the light spots of the laser beams fall on the outer convex apex of the outer arc at the longitudinal outer end of the first vertical ring. These light spots serve as the starting points for measuring the length of the anchor chain multi-link group. The laser probe modules send their respective starting point signals to the PLC controller. The PLC controller simultaneously records the number of the three sets of starting stepper motor pulse signals emitted by the stepper motor driver at this time, thus completing the zero-position information acquisition of the first vertical ring of the anchor chain multi-link group.

[0020] 4) The stepper motor continues to drive the drive wheel to rotate, which in turn drives the connecting block, slider, frame tripod, and laser probe module mounting plate to move towards the final vertical ring of the anchor chain multi-link group as set by the PLC controller. The light spots of the three laser beams pass sequentially through the outer convex apex of the outer arc at the other end of the first vertical ring, the outer convex apex at both ends of the second vertical ring, the outer convex apex at both ends of the third vertical ring, and so on, until the light spots of the laser beams from the three laser probe modules fall on the outer convex apex of the outer arc at the longitudinal outer end of the final vertical ring of the anchor chain multi-link group. The laser probe modules then transmit light to the PLC controller. Each device sends its own endpoint signal, and the PLC controller records the light spot signal at the other end of the longitudinal direction of the last vertical ring of the anchor chain multi-link group. At the same time, the stepper motor driver sends three sets of endpoint stepper motor pulse counts to the PLC controller. The PLC controller performs logical judgment on the three sets of endpoint stepper motor pulse counts and the preset range of the endpoint stepper motor pulse counts of the anchor chain multi-link group, and then sends signals to the stepper motor driver and the three sets of laser probe modules to stop the stepper motors from rotating and turn off the three sets of laser probe modules, thus completing the acquisition of three sets of position information of the last vertical ring of the anchor chain multi-link group.

[0021] 5) The PLC controller subtracts the corresponding starting stepper motor pulse signal number from the number of pulse signals of the end stepper motor for each group, obtaining the pulse signal difference of each of the three anchor chain multi-link groups. The largest pulse signal difference is the number of pulse signals for measuring the length of the anchor chain multi-link group. The PLC controller multiplies the number of pulse signals by the wavelength to obtain the length value of the anchor chain multi-link group, records and stores it in the host computer, and displays it on the host computer display screen of the anchor chain tensioning machine control console, thus completing the length measurement of the anchor chain multi-link group.

[0022] This invention employs three sets of laser probe modules, each projecting a laser beam vertically downwards, with the beam landing on the outer convex vertex of the outer arc at the longitudinal end of the first vertical ring of the anchor chain multi-link assembly. A laser probe module moving unit then moves the three sets of laser probe modules longitudinally until their laser beams land on the outer convex vertex of the outer arc at the longitudinal outer end of the last vertical ring of the anchor chain multi-link assembly. This allows the PLC controller to obtain the length of the anchor chain multi-link assembly calculated from the difference between the first and last pulse counts of the three stepper motors. The PLC controller then determines the length of the anchor chain multi-link assembly closest to the actual length. This invention, using the movement of laser beams projected by laser probe modules to measure the length of the anchor chain multi-link assembly, significantly improves the measurement accuracy and efficiency, and greatly reduces the labor intensity of anchor chain multi-link assembly length measurement.

[0023] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the automatic measuring device for the length of multiple chain links of the anchor chain according to the present invention;

[0025] Figure 2 yes Figure 1 AA section enlarged view;

[0026] Figure 3 yes Figure 1 A magnified view from direction B;

[0027] Figure 4 yes Figure 1 Enlarged view of Part I;

[0028] Figure 5 yes Figure 1 Enlarged view of Part II;

[0029] Figure 6 This is a block diagram of the signal transmission of the present invention. Detailed Implementation

[0030] The invention will be further described below with reference to the accompanying drawings and an embodiment of automatic measurement of the length of the five-link group of the anchor chain.

[0031] The anchor chain tensile testing machine used in this invention is a horizontal anchor chain tensile testing machine. The anchor chain is pulled and fed into the anchor chain tensile testing machine through the drive wheel frames at both ends of the machine, and the tensile test is carried out continuously segment by segment. Figure 1 As shown, the anchor chain segment 200 in this embodiment consists of nine links. The five-link anchor chain group 201, whose length needs to be measured, is located within the anchor chain segment 200, between a pair of movable beam clamping arms 101 at the right end and a pair of fixed beam clamping arms 102 at the left end of the anchor chain tensile testing machine 100. During the tensile test of the anchor chain segment 200, the pair of movable beam clamping arms 101 first clamp the links outside the right end of the anchor chain segment 200, and the pair of fixed beam clamping arms 102 clamp the links outside the left end of the anchor chain segment 200. Then, the piston rod of the main cylinder of the anchor chain tensile testing machine 100 is instructed to move outward, pushing the pair of movable beam clamping arms 101 towards the anchor chain segment 200. Figure 1 Move to the right in the direction indicated by the solid arrow to apply the set tensile load to the anchor chain segment 200. After the tensile load is reached, the main cylinder of the anchor chain tensile testing machine 100 is unloaded, thus completing the tensile test of the anchor chain segment 200.

[0032] like Figures 1-5 As shown, the present invention includes a laser probe module moving unit 1 and a laser probe module automatic measurement unit 2. The laser probe module moving unit 1 is located on the top of the inner side of a longitudinal beam 103 of the anchor chain tensile testing machine 100, and the laser probe module automatic measurement unit 2 is located above the five-link group 201 of the anchor chain to be measured in the anchor chain tensile testing machine 100.

[0033] The laser probe module moving unit 1 includes a stepper motor reducer assembly 11, a mounting base 12, a drive wheel 13, a driven wheel assembly 14, and a transmission belt 15. Figure 3 The left end of the horizontally positioned stepper motor reducer 11 is fixed to the outside of the right side of the mounting base 12. The drive wheel 13 is located inside the U-shaped mounting base 12 and fixed to the output shaft 1111 of the stepper motor reducer 11 extending into the right side of the mounting base 12. The bottom of the mounting base 12 is fixed to the side of the top plate 1031 of a longitudinal beam facing the five-link group 201 of the anchor chain being measured, and is adjacent to the clamping arm 101 of the moving beam of the anchor chain tensile testing machine 100. The drive wheel 13 and the driven wheel 142 are connected by a transmission belt 15, and both ends of the transmission belt 15 are fixed to both sides of the connecting block 16 through connecting seats 161.

[0034] like Figure 4 As shown, the passive wheel assembly 14 includes a passive wheel mounting base 141, a passive wheel 142, a passive wheel shaft 143, and two bushings 144. The passive wheel 142 is fixed in the middle of the passive wheel shaft 143. Both ends of the passive wheel shaft 143 are supported on the center of the passive wheel mounting base 141 by the bushings 144. The bottom of the passive wheel mounting base 141 is fixed on the side of the top plate 1031 of a longitudinal beam facing the five-link group 201 of the anchor chain being measured, and is adjacent to the clamping arm 102 of the fixed beam of the anchor chain tensile testing machine 100.

[0035] The transmission belt 15 is a synchronous toothed belt, and both the driving pulley 13 and the driven pulley 142 are synchronous toothed pulleys with equal pitch circles. The driving pulley 13 and the driven pulley 142 are connected by the transmission belt 15. In this invention, the driving pulley 13 and the driven pulley 142 of the laser probe module moving unit 1 are driven by a synchronous toothed belt, which prevents relative slippage and maintains a strict transmission ratio. This ensures that the automatic measurement unit 2 of the laser probe module can move smoothly, significantly improving the measurement accuracy of the automatic measurement unit 2 of the laser probe module.

[0036] like Figure 1 , Figure 2 and Figure 5 As shown, the automatic measurement unit 2 of the laser probe module includes a frame tripod 21, a linear guide rail assembly 22, a laser probe module mounting plate 23, and three laser probe modules 24. The transmission belt 15 passes over the active wheel 13 and the passive wheel 142 of the passive wheel assembly 14. The linear guide rail assembly 22 includes a slider 221 and a guide rail body 222. The lower side of the guide rail body 222 is supported on the left end of its respective bracket 224 by guide rail body bases 223 arranged at intervals. The right end of the bracket 224 is welded and fixed to the upper part of the longitudinal beam plate 1032.

[0037] The slider 221 is fastened to the upper side of the guide rail 222; the lower side of the high end of the frame tripod 21 is sequentially fixed to the upper side of the slider 221 and the upper side of the connecting block 16, and the laser probe module mounting plate 23 is vertically movable and fixed to the lower end of the frame tripod 31. The frame tripod 21 is assembled from aluminum alloy profiles. The laser probe module mounting plate 23 has a row of vertically spaced mounting holes 231 on both sides. By screwing the screws 25 through the corresponding mounting holes into the bottom 211 of the frame tripod, the laser probe module mounting plate 23 is fixed to the bottom of the frame tripod 211 according to the required vertical distance between the laser probe module 24 and the anchor chain five-link group 201.

[0038] Three horizontally spaced laser probe modules 24 are fixed at one end to the bottom of the laser probe module mounting plate 23 via laser probe module mounting base plates 241. The laser emission point of the central laser probe module 242 is located above the longitudinal center line of the anchor chain support track 104 of the anchor chain tensile testing machine 100. The side laser probe modules 243 are symmetrically arranged on both sides of the central laser probe module 242. Figure 1 and Figure 2 As shown, during the tensile test of the anchor chain tensile testing machine 100, the probability of the center line of the anchor chain segment 200 coinciding with the center line of the anchor chain tensile testing machine is very low. The anchor chain segment 200 is either biased to the left or right of the anchor chain support track 104, resulting in inconsistent length data measured by the three laser probe modules 24. By using the three laser probe modules 24 to measure the length data of three sets of five-link groups 201 of the anchor chain, and then inputting the data into the PLC controller for comparison, the longest five-link length data is the true length data of the five-link group 201 of the anchor chain, significantly improving the accuracy of the length measurement of the multi-link group of the anchor chain.

[0039] The stepper motor 111 of the stepper motor reducer assembly 11 has a rated output torque of 2.39 N·m. The light source of the laser probe module 24 is a red semiconductor laser with a wavelength of 655 nm, and the bright spot range of the red semiconductor laser is Φ0.5 mm.

[0040] like Figures 1-6 As shown, a method for measuring the length of an automatic anchor chain five-link group includes the following steps:

[0041] 1) The anchor chain segment 200 (i.e., between a pair of moving beam clamping arms 101 and a pair of fixed beam clamping arms 102 of the anchor chain tensile testing machine 100) Figure 1 After the anchor chain nine-link group in the anchor chain completes the tensile test, a tensile load of 10% is applied to the anchor chain segment 200 to keep the anchor chain five-link group 201 in the anchor chain segment 200 under tension.

[0042] 2) According to the chain diameter specification of the anchor chain five-link group 201, adjust the fixed position of the laser probe module mounting plate 23 and the frame tripod 21 so that the three laser probe modules 24 are lowered and close to the anchor chain five-link group 201. Then, the three laser probe modules 24 are started by the PLC controller 3 so that the laser beams emitted by the three laser probe modules 24 are perpendicular to the longitudinal axis of the vertical ring 2011 of the anchor chain five-link group 201 under test, thus completing the vertical adjustment of the laser probe module 24.

[0043] 3) Start the stepper motor reducer 11. After receiving the pulse signal from the stepper motor driver 112, the stepper motor 111 drives the drive wheel 13 to rotate. Through the transmission belt 15, the driven wheel 142 rotates synchronously, so that the connecting block 16 drives the slider 221 to move on the guide rail 222 through the frame triangular bracket 21. The laser beams emitted by the three laser probe modules 24 located on the upper side of the first vertical ring 2011 of the five-link anchor chain group 201 move towards the first vertical ring 2011 along with the laser probe module mounting plate 23 until the light spots of the laser beams fall on the outer convex apex 2012 of the outer arc at the longitudinal outer end of the first vertical ring 2011. The light spots serve as the starting points for measuring the length of the five-link anchor chain group 201. The laser probe modules 24 send their respective starting point signals to the PLC controller 3. The PLC controller 3 records the number of three sets of starting stepper motor pulse signals emitted by the stepper motor driver 112 at this time, and completes the zero-position information acquisition of the first vertical ring 2011 of the five-link anchor chain group 201.

[0044] 4) Stepper motor 111 continues to drive drive wheel 13 to rotate, which in turn drives connecting block 16, slider 221, frame tripod 21, and laser probe module mounting plate 23 to move towards the final vertical ring 2011 of the anchor chain five-link group 201 set by PLC controller 3, i.e. Figure 1In the direction indicated by the hollow arrow to the left, the light spots of the three laser beams pass sequentially through the outer convex vertex 2012 of the outer arc at the left end of the first vertical ring 2011, the outer convex vertexes at both ends of the second vertical ring 2011, and the outer convex vertex at the right end of the third vertical ring 2011, until the light spots of the laser beams from the three laser probe modules fall on the outer convex vertex 2012 of the outer arc at the longitudinal outer end of the last (third) vertical ring 2011 of the anchor chain five-link group 201. The laser probe modules 24 send their respective endpoint signals to the PLC controller 3, and the PLC controller 3 records the light spot signal at the longitudinal left end of the last vertical ring 2011 of the anchor chain multi-link group. Simultaneously, the stepper motor driver 112 sends three sets of endpoint stepper motor pulse counts to the PLC controller 3. The PLC controller 3 performs logical judgments on the three sets of endpoint stepper motor pulse counts and the preset range of the endpoint stepper motor pulse counts for the five-link anchor chain group 201. Then, it sends signals to the stepper motor driver 3 and the three sets of laser probe modules 24, causing the stepper motor 111 to stop rotating and the three sets of laser probe modules 24 to be turned off, thus completing the acquisition of the three sets of position information of the last vertical ring 2011 of the five-link anchor chain group 201.

[0045] 5) The PLC controller 3 subtracts the corresponding starting stepper motor pulse signal number from the number of end stepper motor pulse signals of each group of stepper motor drivers 112 to obtain the pulse signal difference of each of the three groups of anchor chain multi-link groups. The largest pulse signal difference is the number of pulse signals for measuring the length of the anchor chain five-link group 201. The PLC controller 3 multiplies the number of pulse signals by the wavelength to obtain the length value of the anchor chain five-link group 201, records and stores it in the host computer, and displays it on the host computer display screen 4 of the anchor chain tensioning machine control console, thereby completing the length measurement of the anchor chain five-link group 201.

[0046] Depending on the application requirements, the same method can be used to measure the length of other odd-numbered anchor chain links.

[0047] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. An automatic measuring device for the length of a multi-link assembly of an anchor chain, characterized in that, It includes a laser probe module moving unit and a laser probe module automatic measurement unit. The laser probe module moving unit is located on the top of the inner side of a longitudinal beam of the anchor chain tensile testing machine, and the laser probe module automatic measurement unit is located above the anchor chain multi-link group in the anchor chain tensile testing machine. The laser probe module moving unit includes a stepper motor reducer assembly, a mounting base, a drive wheel, a driven wheel assembly, and a transmission belt. One end of the horizontally positioned stepper motor reducer assembly is fixed to the outside of one side of the mounting base. The drive wheel is located inside the U-shaped mounting base and fixed to the output shaft of the stepper motor reducer assembly extending into one side of the mounting base. The bottom of the mounting base and the bottom of the driven wheel assembly are respectively fixed to the top plate of a longitudinal beam facing the anchor chain segment being measured. The bottom of the mounting base is adjacent to the clamping arm of the moving beam of the anchor chain tensile testing machine, and the bottom of the driven wheel assembly is adjacent to the clamping arm of the fixed beam of the anchor chain tensile testing machine. The drive wheel and the driven wheel are connected by a transmission belt, and both ends of the transmission belt are fixed to both sides of the connecting block via connecting seats. The automatic measurement unit for the laser probe module includes a frame tripod, a linear guide rail assembly, a laser probe module mounting plate, and several laser probe modules. The linear guide rail assembly includes a slider and a guide rail body. The lower side of the guide rail body is supported on a guide rail body base arranged at intervals. The guide rail body base is supported on one end of a corresponding bracket, and the other end of the bracket is welded and fixed to the upper part of the longitudinal beam. The slider is fastened to the upper side of the guide rail body. The lower side of the high end of the frame tripod is sequentially fixed to the upper side of the slider and the upper side of the connecting block. The laser probe module mounting plate is vertically movable and fixed to the lower end of the frame tripod. One end of the three horizontally spaced laser probe modules is fixed to the bottom of the laser probe module mounting plate through a laser probe module fixing base plate. The laser emission point of the central laser probe module is located above the longitudinal center line of the anchor chain tensile testing machine, and the side laser probe modules are symmetrically arranged on both sides of the central laser probe module.

2. The automatic measuring device for the length of multiple link groups of anchor chains as described in claim 1, characterized in that, The passive wheel assembly includes a passive wheel mounting base, a passive wheel, a passive wheel axle, and two bushings. The passive wheel is fixed in the middle of the passive wheel axle, and both ends of the passive wheel axle are supported on the center of the passive wheel mounting base by bushings.

3. The automatic measuring device for the length of multiple link groups of anchor chains as described in claim 1, characterized in that, The transmission belt is a synchronous toothed belt, and both the driving pulley and the driven pulley are synchronous toothed pulleys with equal pitch circles.

4. The automatic measuring device for the length of multiple link groups of anchor chains as described in claim 1, characterized in that, The rated output torque of the stepper motor in the stepper motor reducer unit is 2.39 N·m.

5. The automatic measuring device for the length of multiple link groups of anchor chains as described in claim 1, characterized in that, The frame-type tripod is assembled from aluminum alloy profiles. The laser probe module mounting plate has a row of vertically spaced mounting holes on both sides. By screwing the corresponding mounting holes into the bottom of the frame-type tripod, the laser probe module mounting plate is fixed to the bottom of the frame-type tripod according to the required vertical distance between the laser probe module and the anchor chain multi-link group.

6. The automatic measuring device for the length of multiple link groups of anchor chains as described in claim 1, characterized in that, The light source of the laser probe module is a red semiconductor laser with a wavelength of 655nm, and the bright spot range of the red semiconductor laser is Φ0.5mm.

7. The automatic measuring device for the length of multiple link groups of anchor chains as described in claim 1, characterized in that, The laser probe module's automatic measurement unit has an accuracy of 0.5 mm in detecting the length of the anchor chain multi-link group.

8. A method for measuring the length of an automatic anchor chain multi-link group as described in any one of claims 1 to 7, characterized in that, Includes the following steps: 1) After the anchor chain segment between a pair of moving beam clamping arms and a pair of fixed beam clamping arms of the anchor chain tensile testing machine has completed the tensile test, a tensile load of 10% is applied to the anchor chain segment to keep the anchor chain multi-link group in the anchor chain segment under tension. 2) According to the chain diameter specifications of the anchor chain multi-link group, adjust the fixing position of the laser probe module mounting plate and the frame tripod so that the three laser probe modules are lowered and close to the anchor chain multi-link group respectively; then start the three laser probe modules respectively through the PLC controller so that the laser beams emitted by the three laser probe modules are perpendicular to the longitudinal axis of the vertical ring of the anchor chain multi-link group under test; complete the vertical adjustment of the laser probe modules; 3) Start the stepper motor reducer unit. After receiving the pulse signal from the stepper motor driver, the stepper motor drives the drive wheel to rotate, which in turn drives the driven wheel to rotate synchronously through the transmission belt. This causes the connecting block to move the slider on the guide rail through the frame triangular bracket. The laser beams emitted by the three laser probe modules located on the upper side of the first vertical ring of the anchor chain multi-link group move towards the first vertical ring along the laser probe module mounting plate until the light spots of the laser beams fall on the outer convex apex of the outer arc at the longitudinal outer end of the first vertical ring. These light spots serve as the starting points for measuring the length of the anchor chain multi-link group. The laser probe modules send their respective starting point signals to the PLC controller. The PLC controller simultaneously records the number of the three sets of starting stepper motor pulse signals emitted by the stepper motor driver at this time, thus completing the zero-position information acquisition of the first vertical ring of the anchor chain multi-link group. 4) The stepper motor continues to drive the drive wheel to rotate, which in turn drives the connecting block, slider, frame tripod, and laser probe module mounting plate to move towards the final vertical ring of the anchor chain multi-link group as set by the PLC controller. The light spots of the three laser beams pass sequentially through the outer convex apex of the outer arc at the other end of the first vertical ring, the outer convex apex at both ends of the second vertical ring, the outer convex apex at both ends of the third vertical ring, and so on, until the light spots of the laser beams from the three laser probe modules fall on the outer convex apex of the outer arc at the longitudinal outer end of the final vertical ring of the anchor chain multi-link group. The laser probe modules then transmit light to the PLC controller. Each device sends its own endpoint signal, and the PLC controller records the light spot signal at the other end of the longitudinal direction of the last vertical ring of the anchor chain multi-link group. At the same time, the stepper motor driver sends three sets of endpoint stepper motor pulse counts to the PLC controller. The PLC controller performs logical judgment on the three sets of endpoint stepper motor pulse counts and the preset range of the endpoint stepper motor pulse counts of the anchor chain multi-link group, and then sends signals to the stepper motor driver and the three sets of laser probe modules to stop the stepper motors from rotating and turn off the three sets of laser probe modules, thus completing the acquisition of three sets of position information of the last vertical ring of the anchor chain multi-link group. 5) The PLC controller subtracts the corresponding starting stepper motor pulse signal number from the number of pulse signals of the end stepper motor for each group, obtaining the pulse signal difference of each of the three anchor chain multi-link groups. The largest pulse signal difference is the number of pulse signals for measuring the length of the anchor chain multi-link group. The PLC controller multiplies the number of pulse signals by the wavelength to obtain the length value of the anchor chain multi-link group, records and stores it in the host computer, and displays it on the host computer display screen of the anchor chain tensioning machine control panel, thus completing the length measurement of the anchor chain multi-link group.

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