Metering steel tape calibrating device

Abstract

The invention discloses a metering steel tape calibrating device which comprises a vertical frame, a calibrating table is welded to the top of the vertical frame, a steel tape placing frame is fixedly installed at the right end of the calibrating table, a first fixed pulley is arranged at the left end of the calibrating table, and a winding assembly is arranged on the lower side of the first fixed pulley. Two CCD cameras are arranged at the top of the verification table, and scale marking pieces are arranged on the left side and the right side of each CCD camera. The winding wheel is driven by the motor to rotate, so that the steel tape is continuously wound on the surface of the winding wheel, the steel tape passes below the two CCD cameras, the two CCD cameras shoot the steel tape at the same time, and whether the scale of the steel tape is standard or not is detected by judging whether the reading difference of two light cross points on the steel tape and the distance between the two CCD cameras have a difference value or not. The long steel tape can continuously pass through the bottoms of the two CCD cameras, and the two CCD cameras shoot for multiple times for sampling verification, so that the purpose of conveniently and continuously verifying the long steel tape is achieved, the verification efficiency is high, and the verification result is accurate.

Description

Technical Field

[0001] This invention relates to the field of steel tape measure calibration technology, specifically a calibration device for measuring steel tape measures. Background Technology

[0002] After the steel tape measure is manufactured, its scale needs to be calibrated to determine if it conforms to the standard. In the actual calibration process, the steel tape measure is pulled out and compared section by section with a standard scale. The presence of discrepancies between the two scales indicates whether the steel tape measure's scale is accurate.

[0003] Chinese patent application date: March 22, 2024, publication number: CN117928331B, discloses a measuring steel tape measure calibration device. Its key technical features include: a testing platform with a steel tape measure body placed on its surface; a tape measure strip housed inside the steel tape measure body; a positioning mechanism on the testing platform surface that cooperates with the steel tape measure body, including a clamping component and a telescopic component; and a protective mechanism on the testing platform surface that cooperates with the tape measure strip, including a compression column, a support component, and a pressing component. By setting the support component and the pressing component to cooperate, the position of the compression column can be automatically adjusted while the tape measure strip extends and retracts within the steel tape measure body, thereby compressing and protecting the tape measure strip, effectively improving the stability of the tape measure strip during testing.

[0004] In this technical solution, if a long steel tape measure (such as 10 meters) is to be calibrated, a testing platform of the corresponding length needs to be set up, which occupies a lot of space. Alternatively, the steel tape measure can be calibrated in sections, which is quite troublesome. Therefore, further improvements are needed. Summary of the Invention

[0005] The purpose of this invention is to provide a calibration device for steel measuring tapes to solve the problems mentioned in the background art.

[0006] This invention provides the following technical solution: a calibration device for a steel measuring tape, comprising a frame, a calibration platform welded to the top of the frame, a steel measuring tape mounting bracket fixedly installed at the right end of the calibration platform, a fixed pulley at the left end of the calibration platform, and a winding assembly below the fixed pulley; steel measuring tape support members are provided through the top of both ends of the calibration platform, two CCD cameras are provided on the top of the calibration platform, scale markers are provided on the left and right sides of the CCD cameras, and a cursor movement drive is provided between the two scale markers.

[0007] Furthermore, the steel tape measure mounting frame has four horizontal columns rotatably connected in a matrix on its surface, through which the steel tape measure passes. The winding assembly includes a second fixed pulley rotatably connected to the upright frame, the second fixed pulley being located to the lower right of the first fixed pulley, a third fixed pulley being located to the lower right of the second fixed pulley, and a winding wheel being located to the right of the third fixed pulley. A motor is fixedly installed at the center of the rear side of the winding wheel. The steel tape measure passes around the left side of the first fixed pulley and then passes over the top of the second fixed pulley and the bottom of the third fixed pulley, finally winding up onto the winding wheel. A movable pulley is provided between the first and second fixed pulleys, through which the steel tape measure passes. A weight is hung at the bottom of the movable pulley.

[0008] Furthermore, a roller frame is slidably connected to the front side of the upright frame, and a spring is fixedly installed between the bottom of the roller frame and the upright frame. A clamping wheel is rotatably connected to the top of the roller frame. The clamping wheel is located on the lower left side of the fixed pulley three. The roller frame moves closer to the fixed pulley three through the elasticity of the spring one. The fixed pulley three and the clamping wheel are clamped on both sides of the steel tape measure.

[0009] Furthermore, a turntable is coaxially fixed to the rear end of the three fixed pulleys. The surface of the turntable is arrayed with grooves. A guide rod is fixedly installed on the inner wall of the groove. An L-shaped locking block is slidably connected in the groove. The L-shaped locking block is slidably connected to the guide rod. A spring is fixedly installed between the L-shaped locking block and the inner wall of the groove. The spring is used to drive the L-shaped locking block to slide into the groove. A collar is sleeved on the outer side of the turntable. The collar is fixedly installed on the rear side of the stand. Limit blocks are arrayed on the inner wall of the collar.

[0010] Furthermore, the top of both ends of the calibration platform is provided with mounting grooves; the steel tape measure support includes guide rods two, and two guide rods two are fixedly installed at the bottom of both ends of the calibration platform. A sliding frame is slidably connected to the two guide rods two, and the sliding frame passes through the mounting groove. A support wheel is rotatably connected to the top of the sliding frame. A pressure plate is fixedly installed at the top of both ends of the calibration platform, and the pressure plate is located directly above the support wheel. Side rails are fixedly installed on the front and rear sides of the side rails. An inclined support arm is fixedly installed at the bottom of the sliding frame, and a sliding column one is fixedly installed on the front side of the bottom end of the inclined support arm. Two U-shaped plates are slidably connected to the surface of the upright frame. An inclined groove and a straight groove are provided through the front side of the U-shaped plates. The top of the inclined groove communicates with the straight groove. The sliding column one is slidably connected in the inclined groove and the straight groove. A rack plate is fixedly installed on the opposite side of the two U-shaped plates, and a gear meshes between the two rack plates.

[0011] Furthermore, a guide rail and a standard scale are fixedly installed on the top of the calibration table. The guide rail and the standard scale are parallel to each other, and the guide rail is located behind the standard scale. An L-shaped slide block is slidably connected to the guide rail. The CCD camera is fixedly installed on the L-shaped slide block. An indicator needle is fixedly installed on the front side of the L-shaped slide block. The indicator needle is in contact with the surface of the standard scale. An L-shaped lug is fixedly installed on the rear side of the L-shaped slide block. A bolt is threadedly connected to the rear side of the L-shaped lug. The bolt is in contact with the rear side of the calibration table.

[0012] Furthermore, the scale marking component includes a hydraulic cylinder fixedly installed on the rear side of the L-shaped slide block, a fixed cover fixedly installed on the back of the hydraulic cylinder, and both ends of the hydraulic cylinder and the fixed cover are interconnected; both ends of the hydraulic cylinder are slidably connected to sliding pistons, a spring is fixedly installed between the two sliding pistons, an inclined seat is fixedly installed at the end of the sliding piston located outside the hydraulic cylinder, a reflector is fixedly installed on the top of the inclined seat, and a linear laser light is provided on the front side of the inclined seat; both ends of the hydraulic cylinder are fixedly installed with limit plates, and the inclined seat is slidably connected to the limit plates.

[0013] Furthermore, a holding basket is fixedly installed on the front side of the tilting seat, and a square sleeve is fixedly installed on the rear side of the tilting seat. The holding basket and the square sleeve are interconnected. The linear laser light is placed inside the holding basket. A push plate is slidably connected inside the holding basket. The push plate is attached to the rear side of the linear laser light. Four sliding rods are fixedly installed in a matrix on the rear side of the push plate. The sliding rods are slidably connected to the tilting seat. A T-shaped sliding plate is slidably connected inside the square sleeve. A spring is fixedly installed between the T-shaped sliding plate and the push plate. A sliding post is fixedly installed at the bottom rear end of the T-shaped sliding plate. A guide groove is opened through the surface of the limiting cross plate. The sliding post is slidably connected in the guide groove.

[0014] Furthermore, the cursor movement drive includes a hydraulic oil tank fixedly installed on the rear side of the stand. Two connecting pipes are connected to the top front end of the hydraulic oil tank, and the two connecting pipes are respectively connected to two fixed covers. A piston plate is slidably connected inside the hydraulic oil tank, and a threaded rod is rotatably connected to the center of the rear side of the piston plate. The threaded rod is threadedly connected to the center of the rear side of the hydraulic oil tank.

[0015] Furthermore, a square-mouth sleeve is fixedly installed at the front end of the threaded rod, and the square-mouth sleeve is rotatably connected to the piston plate. A rotating shaft is fixedly installed at the rear end of the gear, and a square insert is fixedly installed at the rear end of the rotating shaft. The square insert has a rectangular cross-section and is slidably connected inside the square-mouth sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This measuring steel tape measure calibration device uses a motor to drive the winding wheel to rotate, causing the steel tape measure to continuously wind around the surface of the winding wheel. The steel tape measure passes under two CCD cameras, and the two CCD cameras simultaneously photograph the steel tape measure. By judging whether there is a difference between the readings on the steel tape measure at the intersection of two light rays and the distance between the two CCD cameras, the standard of the scale of the steel tape measure is verified. A long steel tape measure can be continuously passed under the two CCD cameras, and the two CCD cameras take multiple pictures for sampling and verification, thereby achieving the purpose of facilitating continuous verification of long steel tape measures, with high verification efficiency and accurate verification results. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the winding assembly of the present invention; Figure 3 This is a three-dimensional structural diagram of the turntable in the winding assembly of the present invention; Figure 4 This is a three-dimensional structural diagram of the steel tape measure support component of the present invention; Figure 5 This is a three-dimensional exploded view of the steel tape measure support component of the present invention; Figure 6 This is a three-dimensional structural diagram of the scale marking component of the present invention; Figure 7 This is a three-dimensional structural diagram of the scale marking component from the rear view of the present invention; Figure 8 This is a three-dimensional cross-sectional view of the scale marking component of the present invention; Figure 9 This is a three-dimensional structural diagram of the cursor movement driver of the present invention.

[0018] In the diagram: 100, upright frame; 200, calibration table; 300, steel tape measure mounting bracket; 400, fixed pulley 1; 500, winding assembly; 600, steel tape measure support; 700, CCD camera; 800, scale marking component; 900, cursor movement drive component; 201. Guide rail; 202. Standard scale; 203. Mounting slot; 301. Horizontal column; 501. Fixed pulley two; 502. Fixed pulley three; 503. Winding wheel; 504. Motor; 505. Movable pulley; 506. Weight; 507. Roller frame; 508. Spring one; 509. Clamping wheel; 510. Turntable; 511. Slide groove; 512. Guide rod one; 513. L-shaped locking block; 514. Spring two; 515. Collar; 516. Limiting block; 601. Guide rod 2; 602. Sliding frame; 603. Support wheel; 604. Pressure plate; 605. Side stop bar; 606. Inclined support arm; 607. Sliding column 1; 608. U-shaped plate; 609. Inclined groove; 610. Straight groove; 611. Rack plate; 612. Gear; 6081. Horizontal groove; 6082. Positioning boss; 701, L-shaped slide; 702, indicator needle; 703, L-shaped lug; 704, bolt; 801, hydraulic cylinder; 802, fixing cover; 803, sliding piston; 804, spring three; 805, tilting seat; 806, reflector; 807, linear laser light; 808, limit plate; 8051. Holding basket; 8052. Square sleeve; 8053. Push plate; 8054. Sliding rod; 8055. T-shaped sliding plate; 8056. Spring four; 8057. Sliding column two; 8081. Guide groove; 901. Hydraulic oil tank; 902. Connecting pipe; 903. Piston plate; 904. Threaded rod; 905. Square sleeve; 906. Rotating shaft; 907. Square insert. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 The present invention provides a technical solution: a measuring steel tape measure calibration device, comprising a frame 100, a calibration platform 200 welded to the top of the frame 100, a steel tape measure mounting bracket 300 fixedly installed on the right end of the calibration platform 200, a fixed pulley 400 provided on the left end of the calibration platform 200, and a winding assembly 500 provided below the fixed pulley 400; steel tape measure support members 600 are provided through the top of both ends of the calibration platform 200, two CCD cameras 700 are provided on the top of the calibration platform 200, scale markers 800 are provided on the left and right sides of the CCD cameras 700, and a cursor movement drive member 900 is provided between the two scale markers 800.

[0021] Please see Figures 1-2The steel tape measure mounting bracket 300 has four horizontal columns 301 connected in a matrix on its surface. The steel tape measure passes through the columns 301. The mounting bracket 300 limits the movement of the steel tape measure's housing. After the steel tape measure is pulled out of the housing, it passes over the top of the fixed pulley 400 and winds onto the surface of the winding assembly 500. The winding assembly 500 winds the steel tape measure, allowing it to pass under two CCD cameras 700. By pre-setting the distance between the two CCD cameras 700, for example, 1 meter, the difference in the scale readings of the steel tape measure captured simultaneously by the two CCD cameras 700 is compared with the distance between the two CCD cameras 700. If they are not equal, the steel tape measure has an error; otherwise, it has no error. The winding assembly 500 continuously winds the steel tape measure, allowing it to continuously pass under the two CCD cameras 700, thus enabling the calibration of long-distance steel tape measures.

[0022] Please see Figures 2-3 The winding assembly 500 includes a second fixed pulley 501 rotatably connected to the upright 100. The second fixed pulley 501 is located to the lower right of the first fixed pulley 400. A third fixed pulley 502 is located to the lower right of the second fixed pulley 501. A winding wheel 503 is located to the right of the third fixed pulley 502. A motor 504 is fixedly installed at the center of the rear side of the winding wheel 503. The steel tape measure passes over the left side of the first fixed pulley 400 and over the top of the second fixed pulley 501 and the bottom of the third fixed pulley 502, finally winding up onto the winding wheel 503. Specifically, the end of the steel tape measure can be fixed to the surface of the winding wheel 503 using tape or the like. A movable pulley 505 is located between the first fixed pulley 400 and the second fixed pulley 501. The steel tape measure passes over the bottom of the movable pulley 505, and a weight 506 is hung at the bottom of the movable pulley 505. Therefore, the steel tape measure between fixed pulley 400 and fixed pulley 501 will be subjected to the downward pulling force of movable pulley 505 and weight 506, thus the steel tape measure between fixed pulley 400 and horizontal column 301 will be subjected to a stable pulling force. When the winding wheel 503 winds up the steel tape measure, the steel tape measure between fixed pulley 400 and horizontal column 301 will remain taut.

[0023] A roller frame 507 is slidably connected to the front side of the upright frame 100. A spring 508 is fixedly installed between the bottom of the roller frame 507 and the upright frame 100. A clamping wheel 509 is rotatably connected to the top of the roller frame 507. The clamping wheel 509 is located to the lower left of the fixed pulley 502. The roller frame 507 moves closer to the fixed pulley 502 through the elasticity of the spring 508. The fixed pulley 502 and the clamping wheel 509 clamp the steel tape measure on both sides. When the end of the steel tape measure is not securely fixed on the winding wheel 503, the fixed pulley 502 and the clamping wheel 509 prevent the steel tape measure from detaching from between them. In practice, the roller frame 507 can be pushed downwards to increase the distance between the clamping wheel 509 and the fixed pulley 3 502. After placing the steel tape measure between the fixed pulley 3 502 and the clamping wheel 509, the roller frame 507 can be released. Under the elastic action of the spring 1 508, the steel tape measure can be clamped by the fixed pulley 3 502 and the clamping wheel 509.

[0024] A turntable 510 is coaxially fixed to the rear end of a fixed pulley 3 502. The surface of the turntable 510 has an array of grooves 511. In this embodiment, there are two grooves 511, and they are arranged radially along the turntable 510. A guide rod 512 is fixedly installed on the inner wall of the groove 511, and the guide rod 512 is arranged radially along the turntable 510. An L-shaped locking block 513 is slidably connected inside the groove 511, and the L-shaped locking block 513 is slidably connected to the guide rod 512. A spring 514 is fixedly installed between the L-shaped locking block 513 and the inner wall of the groove 511, and the spring 514 drives the L-shaped locking block 513 to slide into the groove 511. A collar 515 is sleeved on the outer side of the turntable 510, and the collar 515 is fixedly installed on the rear side of the support frame 100. Limiting blocks 516 are fixedly arranged in an array on the inner wall of the collar 515. When the steel tape measure disengages from the take-up wheel 503, it causes the fixed pulley 3 502 to rotate rapidly. The L-shaped locking block 513 is thrown outward under the action of centrifugal force and locks into the inner side of the limiting block 516, inhibiting the rotation of the fixed pulley 3 502 and the turntable 510, increasing the friction between the fixed pulley 3 502 and the steel tape measure, and further inhibiting the steel tape measure from disengaging from the fixed pulley 3 502 and the clamping wheel 509.

[0025] Please see Figures 4-5The calibration platform 200 has mounting slots 203 extending through its top at both ends, with the two mounting slots 203 located on either side of the two CCD cameras 700. The steel tape measure support 600 includes guide rods 601. Two guide rods 601 are fixedly installed at the bottom of both ends of the calibration platform 200. Sliding frames 602 are slidably connected to the two guide rods 601, passing through the mounting slots 203. Support wheels 603 are rotatably connected to the top of the sliding frames 602. Pressure plates 604 are fixedly installed at the top of both ends of the calibration platform 200, located directly above the support wheels 603 and above the fixed pulleys 400. When the sliding frames 602 move upwards, they push the steel tape measure between the fixed pulleys 400 and the crossbar 301 upwards, thus placing the steel tape measure between the two pressure plates 604 horizontally below the two CCD cameras 700.

[0026] Side stops 605 are fixedly installed on both the front and rear sides, thereby limiting the steel tape measure from the front and rear sides and preventing it from moving. An inclined support arm 606 is fixedly installed at the bottom of the sliding frame 602, and a sliding column 607 is fixedly installed on the front side of the bottom end of the inclined support arm 606. Two U-shaped plates 608 are slidably connected to the surface of the upright frame 100. Specifically, two transverse grooves 6081 are formed through the rear side of the U-shaped plates 608, and two positioning bosses 6082 are fixedly installed on the surface of the upright frame 100. The U-shaped plates 608 are slidably connected to the positioning bosses 6082 through the transverse grooves 6081.

[0027] An inclined groove 609 and a straight groove 610 are provided through the front side of the U-shaped plate 608. The top of the inclined groove 609 communicates with the straight groove 610. The sliding column 607 is slidably connected in the inclined groove 609 and the straight groove 610. A rack plate 611 is fixedly installed on the opposite side of each of the two U-shaped plates 608, and a gear 612 meshes between the two rack plates 611. By rotating the gear 612, the two rack plates 611 are driven to move in opposite directions, so that the U-shaped plate 608 is located on the inner wall of the inclined groove 609 and squeezes the sliding column 607, which drives the inclined support arm 606, the sliding frame 602 and the support wheel 603 to move upward. When the sliding column 607 slides into the straight groove 610, the support wheel 603 remains at the current height, so that the steel tape measure is in a state of being clamped by the pressure plate 604 and the support wheel 603.

[0028] Please see Figures 6-7A guide rail 201 and a standard scale 202 are fixedly mounted on the top of the calibration table 200. The guide rail 201 and the standard scale 202 are parallel to each other, with the guide rail 201 located behind the standard scale 202. In this embodiment, the scale of the standard scale 202 is 1m. An L-shaped slide block 701 is slidably connected to the guide rail 201. A CCD camera 700 is fixedly mounted on the L-shaped slide block 701. An indicator needle 702 is fixedly mounted on the front side of the L-shaped slide block 701, and the indicator needle 702 is in contact with the surface of the standard scale 202. An L-shaped lug 703 is fixedly mounted on the rear side of the L-shaped slide block 701, and a bolt 704 is threadedly connected to the rear side of the L-shaped lug 703, with the bolt 704 in contact with the rear side of the calibration table 200. Thus, by indicating the scale at both ends of the standard scale 202 with the indicator needle 702, the distance between the two CCD cameras 700 is controlled to be 1m. Tighten bolt 704 again to press the front end of bolt 704 against the rear side of calibration table 200 to position L-shaped slide 701 and CCD camera 700.

[0029] Please see Figures 6-7 The scale marker 800 includes a hydraulic cylinder 801 fixedly mounted on the rear side of an L-shaped slide block 701. A fixed cover 802 is fixedly mounted on the back of the hydraulic cylinder 801, and both ends of the hydraulic cylinder 801 and the fixed cover 802 are interconnected. Sliding pistons 803 are slidably connected to both ends of the hydraulic cylinder 801, and a spring 804 is fixedly mounted between the two sliding pistons 803. The two sliding pistons 803 divide the hydraulic cylinder 801 into three cavities. The fixed cover 802 communicates with the cavity at the end of the hydraulic cylinder 801, and the spring 804 is located in the middle cavity of the hydraulic cylinder 801. Hydraulic oil is introduced into the fixed cover 802 by the cursor movement drive 900, increasing the amount of hydraulic oil in the cavity at the end of the hydraulic cylinder 801. This causes the two sliding pistons 803 to move towards each other, compressing the spring 804. Similarly, the cursor movement drive 900 draws hydraulic oil from inside the fixed cover 802, and the elasticity of the spring 804 causes the two sliding pistons 803 to move away from each other.

[0030] A tilting seat 805 is fixedly mounted on one end of the sliding piston 803 outside the hydraulic cylinder 801. The tilting seat 805 is tilted, and the CCD camera 700 is located in the middle between the two tilting seats 805. A reflector 806 is fixedly mounted on the top of the tilting seat 805, and the reflector 806 is tilted downwards. A linear laser light 807 is provided on the front side of the tilting seat 805. Limiting plates 808 are fixedly mounted on both ends of the hydraulic cylinder 801, and the tilting seat 805 is slidably connected to the limiting plates 808. The limiting plates 808 guide the tilting seat 805 to prevent it from rotating around the axis of the sliding piston 803. The linear laser light 807 illuminates the reflector 806 with a linear beam of light. After being reflected by the reflector 806, the light is reflected onto the top of the calibration table 200, and the linear beams reflected by the two reflectors 806 intersect each other, with the intersection point located below the CCD camera 700. As the two tilting mounts 805 move towards or away from each other, the intersection point of the light rays moves along the front-back direction, causing the intersection point to move onto the surface of the steel tape measure. Thus, when the CCD camera 700 takes a picture of the scale on the steel tape measure, the position of the intersection point on the scale can indicate the scale value captured by the two CCD cameras 700.

[0031] Please see Figures 7-8 A holding basket 8051 is fixedly installed on the front side of the tilting seat 805, and a square sleeve 8052 is fixedly installed on the rear side of the tilting seat 805. The holding basket 8051 and the square sleeve 8052 are connected to each other, and a linear laser light 807 is placed inside the holding basket 8051.

[0032] A push plate 8053 is slidably connected inside the holding basket 8051. The push plate 8053 is attached to the rear side of the linear laser light 807. Four slide rods 8054 are fixedly installed in a matrix on the rear side of the push plate 8053. The slide rods 8054 are slidably connected to the tilting seat 805. A T-shaped slide plate 8055 is slidably connected inside the square sleeve 8052. A spring 8056 is fixedly installed between the T-shaped slide plate 8055 and the push plate 8053. A slide post 8057 is fixedly installed at the bottom rear end of the T-shaped slide plate 8055. A guide groove 8081 is opened through the surface of the limiting horizontal plate 808. The slide post 8057 is slidably connected inside the guide groove 8081. As the two tilting seats 805 move towards each other, causing the light beam intersection point to move from front to back onto the surface of the steel measuring tape, the sliding column 8057 slides along the guide groove 8081, thereby causing the T-shaped sliding plate 8055 to move forward relative to the square sleeve 8052. The spring 8056 is compressed, causing the push plate 8053 to press against the rear side of the linear laser light 807, keeping the linear laser light 807 firmly against the inner front wall of the basket 8051. This ensures that the two linear laser lights 807 remain in the same position within the basket 8051, keeping the light beam intersection point directly below the CCD camera 700.

[0033] Please see Figures 7-8 The cursor movement drive component 900 includes a hydraulic oil tank 901 fixedly installed on the rear side of the support frame 100. Two connecting pipes 902 are connected to the top front end of the hydraulic oil tank 901, and each connecting pipe 902 is connected to one of two fixed covers 802. A piston plate 903 is slidably connected inside the hydraulic oil tank 901. A threaded rod 904 is rotatably connected to the center rear side of the piston plate 903, and the threaded rod 904 is threadedly connected to the center rear side of the hydraulic oil tank 901. A square-mouth sleeve 905 is fixedly installed at the front end of the threaded rod 904, and the square-mouth sleeve 905 is rotatably connected to the piston plate 903. A rotating shaft 906 is fixedly installed at the rear end of the gear 612, and a square insert 907 is fixedly installed at the rear end of the rotating shaft 906. The square insert 907 has a rectangular cross-section and is slidably connected inside the square-mouth sleeve 905. By turning the threaded rod 904, the piston plate 903 is moved forward inside the hydraulic oil tank 901, allowing the hydraulic oil inside the tank to pass through the connecting pipe 902 and enter the fixed cover 802. As the threaded rod 904 rotates, the square sleeve 905 drives the square insert 907, the rotating shaft 906, and the gear 612 to rotate synchronously, thereby causing the support wheel 603 to lift the steel tape measure upwards.

[0034] Working principle: The steel tape measure housing is placed into the steel tape measure mounting bracket 300, and the steel tape measure is pulled out from the housing. After the steel tape measure passes over the top of the fixed pulley 1 400, the bottom of the movable pulley 505, the top of the fixed pulley 2 501, and the bottom of the fixed pulley 3 502, the end of the steel tape measure is fixed to the surface of the take-up wheel 503. By turning the threaded rod 904, the piston plate 903 is driven to move forward along the hydraulic oil tank 901. The hydraulic oil inside the hydraulic oil tank 901 enters the fixed cover 802 through the connecting pipe 902. At the same time, through the cooperation of the square sleeve 905 and the square insert 907, the gear 612 is driven to rotate, thereby driving the two rack plates 611 to move in opposite directions. The U-shaped plate 608 is located on the inner wall of the inclined groove 609 and squeezes the sliding column 607, driving the inclined support arm 606 and the sliding frame 602 to move upward. The support wheel 603 lifts the steel tape measure upward. Finally, the pressure plate 604 and the pressure plate 604 cooperate to clamp the steel tape measure. After the sliding column 607 slides into the straight groove 610, the support wheel 603 and the pressure plate 604 maintain the clamping state of the steel tape measure. Since the two ends of the fixed cover 802 are connected to the two ends of the hydraulic cylinder 801, as the hydraulic oil inside the fixed cover 802 increases, the hydraulic oil in the cavities at both ends of the hydraulic cylinder 801 also increases, causing the two sliding pistons 803 to move towards each other, the spring 804 to be compressed, and the two tilting seats 805 to move closer to each other. The "I"-shaped light illuminating the reflector 806 by the line laser lamp 807 is reflected by the reflector 806 and then illuminates the surface of the calibration table 200. As the two tilting seats 805 move closer to each other, the intersection of the reflected light from the two reflectors 806 moves to the surface of the steel tape measure. During this process, the second sliding column 8057 slides along the guide groove 8081, causing the T-shaped sliding plate 8055 to move forward, the fourth spring 8056 is compressed, and the push plate 8053 presses against the back of the straight laser light 807, keeping the straight laser light 807 in contact with the front side wall of the basket 8051. The motor 504 drives the take-up wheel 503 to rotate, causing the steel tape measure to continuously wind around the surface of the take-up wheel 503. The steel tape measure passes under the two CCD cameras 700, and the two CCD cameras 700 simultaneously take pictures of the steel tape measure. By judging whether there is a difference between the readings on the steel tape measure at the intersection of the two light rays and the distance between the two CCD cameras 700, the standard of the scale of the steel tape measure is verified.

Claims

1. A calibration device for a steel measuring tape, comprising a stand (100), characterized in that: The top of the stand (100) is welded with a calibration table (200), a steel tape measure holder (300) is fixedly installed on the right end of the calibration table (200), a fixed pulley (400) is provided on the left end of the calibration table (200), and a winding assembly (500) is provided on the lower side of the fixed pulley (400). The top of both ends of the calibration table (200) is provided with steel tape measure support members (600), and two CCD cameras (700) are provided on the top of the calibration table (200). Scale markers (800) are provided on the left and right sides of the CCD cameras (700), and a cursor movement drive member (900) is provided between the two scale markers (800).

2. The calibration device for a steel measuring tape according to claim 1, characterized in that: The steel tape measure mounting bracket (300) has four horizontal columns (301) connected in a matrix on its surface, and the steel tape measure passes through the horizontal columns (301); The winding assembly (500) includes a second fixed pulley (501) rotatably connected to the upright (100). The second fixed pulley (501) is located on the lower right side of the first fixed pulley (400). A third fixed pulley (502) is provided on the lower right side of the second fixed pulley (501). A winding wheel (503) is provided on the right side of the third fixed pulley (502). A motor (504) is fixedly installed at the center of the rear side of the winding wheel (503). The steel tape measure passes around the left side of fixed pulley one (400) and passes over the top of fixed pulley two (501) and the bottom of fixed pulley three (502), and finally is wound up on the winding wheel (503); A movable pulley (505) is provided between the fixed pulley one (400) and the fixed pulley two (501). A steel tape measure passes around the bottom of the movable pulley (505), and a weight (506) is hung at the bottom of the movable pulley (505).

3. The calibration device for a steel measuring tape according to claim 2, characterized in that: A roller frame (507) is slidably connected to the front side of the upright frame (100). A spring (508) is fixedly installed between the bottom of the roller frame (507) and the upright frame (100). A clamping wheel (509) is rotatably connected to the top of the roller frame (507). The clamping wheel (509) is located on the lower left side of the fixed pulley (502). The roller frame (507) moves closer to the fixed pulley (502) by the elasticity of the spring (508). The fixed pulley (502) and the clamping wheel (509) are clamped on both sides of the steel tape measure.

4. The calibration device for a steel measuring tape according to claim 2, characterized in that: The rear end of the fixed pulley three (502) is coaxially fixed with a turntable (510). The surface of the turntable (510) is arrayed with sliding grooves (511). A guide rod one (512) is fixedly installed on the inner wall of the sliding groove (511). An L-shaped block (513) is slidably connected in the sliding groove (511). The L-shaped block (513) is slidably connected to the guide rod one (512). A spring two (514) is fixedly installed between the L-shaped block (513) and the inner wall of the sliding groove (511). The spring two (514) is used to drive the L-shaped block (513) to slide into the sliding groove (511). A collar (515) is fitted on the outside of the turntable (510). The collar (515) is fixedly installed on the rear side of the stand (100). Limiting blocks (516) are fixed in an array on the inner wall of the collar (515).

5. The calibration device for a steel measuring tape according to claim 1, characterized in that: The top of both ends of the calibration table (200) are provided with mounting slots (203); The steel tape measure support (600) includes guide rod two (601). Two guide rod two (601) are fixedly installed at the bottom of both ends of the calibration table (200). A sliding frame (602) is slidably connected to the two guide rod two (601). The sliding frame (602) passes through the mounting groove (203). A support wheel (603) is rotatably connected to the top of the sliding frame (602). A pressure plate (604) is fixedly installed at the top of both ends of the calibration table (200). The pressure plate (604) is located directly above the support wheel (603). Side bars (605) are fixedly installed on the front and rear sides of the side bars (605). An inclined support arm (606) is fixedly installed at the bottom of the sliding frame (602), and a sliding column (607) is fixedly installed at the front side of the bottom end of the inclined support arm (606). The support frame (100) has two U-shaped plates (608) slidably connected to its surface. The front side of the U-shaped plate (608) is provided with an inclined groove (609) and a straight groove (610). The top of the inclined groove (609) is connected to the straight groove (610). The sliding column (607) is slidably connected in the inclined groove (609) and the straight groove (610). A rack plate (611) is fixedly installed on each of the two U-shaped plates (608) on opposite sides, and a gear (612) meshes between the two rack plates (611).

6. The calibration device for a steel measuring tape according to claim 1, characterized in that: The top of the calibration table (200) is fixedly equipped with a guide rail (201) and a standard scale (202). The guide rail (201) and the standard scale (202) are parallel to each other, and the guide rail (201) is located behind the standard scale (202). An L-shaped slide block (701) is slidably connected to the guide rail (201). The CCD camera (700) is fixedly mounted on the L-shaped slide block (701). An indicator needle (702) is fixedly mounted on the front side of the L-shaped slide block (701). The indicator needle (702) is attached to the surface of the standard scale (202). An L-shaped lug (703) is fixedly mounted on the rear side of the L-shaped slide block (701). A bolt (704) is threadedly connected to the rear side of the L-shaped lug (703). The bolt (704) is attached to the rear side of the calibration table (200).

7. The calibration device for a steel measuring tape according to claim 1, characterized in that: The scale marking component (800) includes a hydraulic cylinder (801) fixedly installed on the rear side of the L-shaped slide (701), and a fixing cover (802) is fixedly installed on the back of the hydraulic cylinder (801). Both ends of the hydraulic cylinder (801) and the fixing cover (802) are connected to each other. Both ends of the hydraulic cylinder (801) are slidably connected to sliding pistons (803). A spring (804) is fixedly installed between the two sliding pistons (803). An inclined seat (805) is fixedly installed at one end of the sliding piston (803) outside the hydraulic cylinder (801). A reflector (806) is fixedly installed on the top of the inclined seat (805). A line-shaped laser light (807) is provided on the front side of the inclined seat (805). Both ends of the hydraulic cylinder (801) are fixedly installed with limiting plates (808), and the tilting seat (805) is slidably connected to the limiting plates (808).

8. The calibration device for a steel measuring tape according to claim 7, characterized in that: A holding basket (8051) is fixedly installed on the front side of the tilting seat (805), and a square sleeve (8052) is fixedly installed on the rear side of the tilting seat (805). The holding basket (8051) and the square sleeve (8052) are connected to each other, and the linear laser light (807) is placed inside the holding basket (8051). A push plate (8053) is slidably connected inside the holding basket (8051). The push plate (8053) is attached to the rear side of the linear laser light (807). Four sliding rods (8054) are fixedly installed in a matrix on the rear side of the push plate (8053). The sliding rods (8054) are slidably connected to the tilting seat (805). A T-shaped sliding plate (8055) is slidably connected through the square sleeve (8052), and a spring (8056) is fixedly installed between the T-shaped sliding plate (8055) and the push plate (8053). The T-shaped sliding plate (8055) has a sliding post 2 (8057) fixedly installed at the bottom of its rear end. The limiting horizontal plate (808) has a guide groove (8081) through it. The sliding post 2 (8057) is slidably connected in the guide groove (8081).

9. A calibration device for a steel measuring tape according to claim 1, characterized in that: The cursor movement drive (900) includes a hydraulic oil tank (901) fixedly installed on the rear side of the stand (100). The top front end of the hydraulic oil tank (901) is connected to two connecting pipes (902), which are respectively connected to two fixed covers (802). A piston plate (903) is slidably connected inside the hydraulic oil tank (901). A threaded rod (904) is rotatably connected at the center of the rear side of the piston plate (903). The threaded rod (904) is threadedly connected at the center of the rear side of the hydraulic oil tank (901).

10. A calibration device for a steel measuring tape according to claim 9, characterized in that: A square sleeve (905) is fixedly installed at the front end of the threaded rod (904). The square sleeve (905) is rotatably connected to the piston plate (903). A rotating shaft (906) is fixedly installed at the rear end of the gear (612). A square insert (907) is fixedly installed at the rear end of the rotating shaft (906). The square insert (907) has a rectangular cross-section and is slidably connected inside the square sleeve (905).

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