Metering steel tape calibrating device

Abstract

The invention relates to the technical field of metering and calibrating devices, in particular to a metering steel tape calibrating device. The flexible rule comprises frame bodies, a movable rail is arranged between the frame bodies, a movable trolley is arranged on the side wall of the movable rail, the movable trolley moves on the side wall of the movable rail in the horizontal direction, and a fixing assembly is arranged at the bottom of a flexible rule body. The rack drives the double-end gear rod to rotate in an engaged mode, the double-end gear rod drives the bevel gear to rotate when rotating, so that the rotating frame rotates on the inner wall of the supporting frame, the pressing rollers arranged at the bottom of the rotating frame are far away from the surface of the base plate when the rotating frame rotates, and the gaps between the pressing rollers and the base plate are enlarged; the rotating frame is reset under the acting force of the torsional spring, so that the roll core on the surface of the base plate is pressed and limited by the pressing roller, and the verification effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of measurement and calibration devices, and in particular to a measurement steel tape calibration device. Background Art

[0002] Steel tape measures are commonly used measuring tools in industrial and mining enterprises and institutions. During the production process of steel tape measures, there will be errors in the engraving of the scale, and the larger the measuring range of the steel tape measure, the greater the error. Therefore, the accuracy of the steel tape measure needs to be calibrated before leaving the factory.

[0003] There are many existing technologies for verification devices, such as:

[0004] Chinese patent publication number CN220818771U discloses a reading device for steel tape measurement, calibration and measurement, including a base and a reading device slidably mounted on the base, a rotating roller movably mounted on the base, the rotating roller and the reading device cooperate with each other, the rotating roller and the reading device are connected and fixed by a flexible buffer device, and the rotating roller is adaptively adjusted by the flexible buffer device. The patent performs metrological calibration on the workpiece on the base through the reading device, and the reading device drives the rotating roller to contact the workpiece to achieve limited flattening of the workpiece to prevent the workpiece from being dislocated or protruding during the metrological calibration, thereby affecting the accuracy of the metrological calibration. At the same time, the rotating roller is adaptively adjusted by the flexible buffer device to improve the safety performance of use.

[0005] However, there are still some problems in actual use:

[0006] 1. At present, the traditional calibration device cannot effectively limit the position of the winding core in the stretched state when in use. During the winding core stretching process, due to the lack of limiting measures, the winding core is prone to position shift. This position shift will have a great impact on the accuracy of the calibration, because the length measurement of the steel tape measure needs to be carried out in a stable and accurate state. Once the position of the winding core shifts, the stretching state of the steel tape measure will change, which will lead to deviations in the measurement results and reduce the reliability and accuracy of the calibration;

[0007] 2. When the core calibration is completed and the automatic winding operation is performed, the core is often prone to bending and getting stuck. In this case, the operator is required to adjust it, which undoubtedly greatly reduces the winding efficiency. On the one hand, the intervention of the operator increases the complexity and time cost of the operation. On the other hand, frequent adjustments may also cause a certain degree of damage to the steel tape measure, affecting its service life and measurement accuracy.

[0008] In view of this, we propose a steel tape measure calibration device for measurement. Summary of the invention

[0009] The object of the present invention is to provide a measuring steel tape calibration device to solve the problems raised in the above-mentioned background technology.

[0010] To achieve the above-mentioned object, the present invention aims to provide a calibration device for a steel tape measure for measurement, comprising a frame, wherein a movable rail is arranged between the frames, the movable rail is symmetrically arranged, and a corresponding scale line is arranged on the surface of the movable rail. A movable vehicle is arranged on the side wall of the movable rail, and the movable vehicle moves horizontally on the side wall of the movable rail. A connecting plate is arranged between the movable vehicles, and a latch is arranged on the surface of the connecting plate. The latch is used to limit the limiting hole at the end of the tape measure body. A pad is arranged on the surface of the movable rail, and a through groove is opened on the surface of the pad. A tape measure body is arranged on one side of the frame, and a fixing component is arranged at the bottom of the tape measure body, and the fixing component is used to fix and limit the tape measure body. A support frame is arranged on the surface of the pad, and a limiting component is arranged inside the support frame. During the calibration process of the tape measure body, the winding core stretched by the tape measure body is limited by the limiting component, so that the winding core moves in contact with the surface of the pad, and an adjusting component is arranged below the latch, and the adjusting component is used to adjust the height of the latch, and at the same time, the latch and the limiting hole at the end of the tape measure body are reinforced during the movement.

[0011] As a further improvement of the present technical solution, the fixing assembly includes a motor arranged below the tape measure body, a main gear is provided at the output end of the motor, sub-gears are provided on both sides of the main gear, a screw rod is provided at the end of the sub-gear, a splint is provided on the surface of the screw rod, and the screw rod drives the splint to move relative to each other when it rotates.

[0012] As a further improvement of the technical solution, gaps are provided between the pads provided on the surface of the movable rail, the width of the gaps is smaller than the width of the core of the tape measure body, and the core moves on the surface of the pads when subjected to the tension of the tongue.

[0013] As a further improvement of the technical solution, a rack is provided on the top of the mobile vehicle, and the rack passes through the through slot and moves on the surface of the pad, and a limiting component is provided on one side of the pad.

[0014] As a further improvement of the present technical solution, the limiting assembly includes a rotating frame arranged inside the support frame, the side wall of the rotating frame is provided with a support rod, the support rod rotates inside the support frame, a pressure roller is provided at the bottom of the rotating frame, and a rubber pad is provided at the bottom of the pressure roller, and the rubber pad is in contact with the surface of the pad.

[0015] As a further improvement of the technical solution, a torsion spring is provided between the support frame and the support rod, and the rotating frame rotates inside the support frame. In a natural state, the rotating frame is perpendicular to the horizontal plane due to the force of the torsion spring.

[0016] As a further improvement of the present technical solution, a bevel gear is provided on the surface of the support rod, and a double-headed gear rod is provided under the bevel gear. When the mobile vehicle drives the connecting plate to move, the rack provided on the top of the mobile vehicle drives the double-headed gear rod to engage and rotate, so that the bevel gear provided above the double-headed gear rod rotates, and the rotation of the bevel gear drives the rotating frame to rotate, so that the core of the tape measure body moves to under the pressure roller, and when the rack is away from the double-headed gear rod, the rotating frame is reset by the force of the torsion spring, and the top of the core is squeezed and limited by the pressure roller.

[0017] As a further improvement of the present technical solution, the adjustment assembly includes a support plate arranged below the tongue, guide rods are arranged between the two sides of the support plate and the connecting plate, a cylinder is arranged at the bottom of the connecting plate, the cylinder penetrates the connecting plate to push the support plate, so that the support plate drives the tongue to move in a vertical direction to fix the limit holes at the end of the tape measure body of different sizes.

[0018] As a further improvement of the technical solution, the tongue is in a "7" shape, and the width of the tongue is smaller than the width of the gap formed between the pads. The piston rod at the end of the control cylinder drives the tongue to penetrate the pad and move to the limit hole at the end of the tape measure body.

[0019] As a further improvement of the technical solution, a column tube is provided on one side of the latch tongue, a sliding column is slidably provided on the inner wall of the column tube, a telescopic spring is provided between the column tube and the sliding column, a wedge block is provided on the top of the sliding column, and when the limiting hole at the end of the tape measure body is fixed on the surface of the latch tongue, the end of the wedge block is squeezed by the force of the coil spring inside the tape measure body, so that the sliding column provided at the bottom of the wedge block slides on the inner wall of the column tube.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the measuring steel tape calibration device, the tape body is placed on the surface of the frame, and the output end of the motor is controlled to drive the main gear to rotate. When the main gear rotates, it drives the sub-gear to mesh and rotate. When the sub-gear rotates, it drives the lead screw to rotate coaxially. The clamping plates provided on the surface of the lead screw move relatively, so that the clamping plates move to the side wall of the tape body to clamp and fix it, thereby improving the stability of the tape body and thus improving the efficiency of calibration.

[0022] 2. In the measuring steel tape calibration device, the movable vehicle is controlled to drive the latch on the surface of the connecting plate to move horizontally, and the latch stretches the winding core. When the latch moves to the bottom of the support frame, the rack drives the double-headed gear rod to rotate in meshing, and the double-headed gear rod rotates to drive the bevel gear to rotate, so that the rotating frame rotates on the inner wall of the support frame. When the rotating frame rotates, the pressure roller at the bottom thereof moves away from the surface of the pad, so that the gap between the pressure roller and the pad is increased. When the latch drives the winding core away from the bottom of the current pressure roller, the rotating frame is reset by the force of the torsion spring, so that the pressure roller presses and limits the winding core on the surface of the pad, avoiding position deviation of the winding core when it moves on the surface of the pad, thereby improving the calibration effect.

[0023] 3. In the measuring steel tape calibration device, when the limit hole at the end of the tape body is limited by the latch tongue, the limit hole passes through the surface of the latch tongue and is driven to reel in the winding core by the force of the winding spring. During the reeling process, the top of the wedge block is pressed, and the wedge block is driven by the extrusion force to drive the slide column to slide on the inner wall of the column tube, and at the same time, the telescopic spring is squeezed. When the winding core is fitted and fixed on the end of the latch tongue, the external force on the wedge block disappears, and the telescopic spring applies a reverse force to the slide column, so that the wedge block provided at the end of the slide column limits the end of the tape body. The limitation of the wedge block can ensure that the latch tongue and the limit hole at the end of the tape body do not fall off, thereby realizing the rapid reeling of the winding core. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the mobile vehicle of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the fixing assembly of the present invention;

[0027] Figure 4 It is a schematic diagram of the pad structure of the present invention;

[0028] Figure 5 For the present invention Figure 4 Schematic diagram of point A;

[0029] Figure 6 It is a schematic diagram of the structure of the regulating component of the present invention;

[0030] Figure 7 It is a schematic diagram of the structure of the movable rail of the present invention;

[0031] Figure 8 It is a cross-sectional view of the adjustment component of the present invention.

[0032] The meaning of each number in the figure is:

[0033] 100, frame; 101, moving rail; 102, pad; 103, tape measure body; 104, support frame; 105, through slot;

[0034] 200, mobile vehicle; 201, connecting plate; 202, latch; 203, rack;

[0035] 300, fixing assembly; 301, motor; 302, main gear; 303, secondary gear; 304, screw rod; 305, clamping plate;

[0036] 400, limit assembly; 401, rotating frame; 402, pressure roller; 403, bevel gear; 404, double-headed gear rod; 405, torsion spring;

[0037] 500, adjustment assembly; 501, cylinder; 502, support plate; 503, guide rod; 504, column tube; 505, slide column; 506, telescopic spring; 507, wedge block. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] The purpose of this embodiment is to provide a measuring steel tape calibration device, referring to Figure 1-Figure 8As shown, it includes a frame 100, a movable rail 101 is arranged between the frames 100, the movable rail 101 is symmetrically arranged, and a corresponding scale line is arranged on the surface of the movable rail 101, a movable vehicle 200 is arranged on the side wall of the movable rail 101, and the movable vehicle 200 moves along the side wall of the movable rail 101 in a horizontal direction, a connecting plate 201 is arranged between the movable vehicles 200, and a tongue 202 is arranged on the surface of the connecting plate 201, and the tongue 202 is used to limit the limiting hole at the end of the tape measure body 103, a pad 102 is arranged on the surface of the movable rail 101, and a through groove 105 is opened on the surface of the pad 102, and a tape measure body 103 is arranged on one side of the frame 100, A fixing component 300 is provided at the bottom of the tape measure body 103, and the fixing component 300 is used to fix and limit the tape measure body 103. A support frame 104 is provided on the surface of the pad 102, and a limiting component 400 is provided inside the support frame 104. During the calibration of the tape measure body 103, the core of the tape measure body 103 is limited by the limiting component 400, so that the core moves along the surface of the pad 102. An adjusting component 500 is provided under the tongue 202, and the adjusting component 500 is used to adjust the height of the tongue 202. At the same time, the limiting hole at the end of the tongue 202 and the tape measure body 103 is reinforced during the movement.

[0041] During the calibration process of the tape measure body 103, when the tape measure body 103 is unstable, the measurement deviation needs to be recalibrated. In order to improve the calibration efficiency, the tape measure body 103 needs to be fixed. Therefore, the fixing component 300 includes a motor 301 arranged below the tape measure body 103, a main gear 302 is arranged at the output end of the motor 301, and sub gears 303 are arranged on both sides of the main gear 302. A screw rod 304 is arranged at the end of the sub gear 303, and a clamping plate 305 is arranged on the surface of the screw rod 304. The screw rod 304 rotates When the main gear 302 rotates, the sub-gear 303 is driven to mesh and rotate. When the sub-gear 303 rotates, the screw rod 304 is driven to rotate coaxially. The splint 305 provided on the surface of the screw rod 304 moves relative to each other, so that the splint 305 moves to the side wall of the tape measure body 103 to clamp and fix it, thereby improving the stability of the tape measure body 103 and thus improving the efficiency of calibration.

[0042] When the core length of the tape measure body 103 is checked, the core is thin and easily deformed. When the core is stretched and checked, the core is easily bent and deviated, which affects the accuracy of the check. Therefore, a rack 203 is provided on the top of the mobile vehicle 200, and the rack 203 passes through the through slot 105 and moves on the surface of the pad 102. A limit assembly 400 is provided on one side of the pad 102. The limit assembly 400 includes a rotating frame 401 arranged inside the support frame 104, and a support rod is provided on the side wall of the rotating frame 401. The support rod rotates inside the support frame 104, and a pressure roller 402 is provided at the bottom of the rotating frame 401. A rubber pad is provided at the bottom of the pressure roller 402, and the rubber pad is in contact with the surface of the pad 102. The movable rail 101 There is a gap between the pads 102 provided on the surface, and the width of the gap is smaller than the core width of the tape measure body 103. When the core is pulled by the tongue 202, it moves on the surface of the pad 102, and the limiting hole at the end of the tape measure body 103 is fixed by the tongue 202. When the mobile vehicle 200 drives the tongue 202 to move to stretch the core of the tape measure body 103, the core moves on the surface of the pad 102, and the top of the core is limited by the pressure roller 402, that is, when the core passes the bottom of the pressure roller 402, the rubber pad of the pressure roller 402 presses and limits the top of the core, so that the core moves stably on the surface of the pad 102, avoiding bending when the core is calibrated and measured, thereby improving the accuracy of the calibration.

[0043] Considering that the rubber pad on the surface of the pressure roller 402 fits the surface of the pad 102, when the tongue 202 drives the winding core to move under the pressure roller 402, the winding core is easily stuck on the side wall of the pressure roller 402, causing the winding core to deform in different force directions. Therefore, a torsion spring 405 is provided between the support frame 104 and the support rod, and the rotating frame 401 rotates inside the support frame 104. In the natural state, the rotating frame 401 is perpendicular to the horizontal plane due to the force of the torsion spring 405, and the surface of the support rod is provided with a bevel gear 403. A double-headed gear rod 404 is provided on the side. When the mobile vehicle 200 drives the connecting plate 201 to move, the rack 203 provided on the top of the mobile vehicle 200 drives the double-headed gear rod 404 to mesh and rotate, so that the bevel gear 403 provided on the double-headed gear rod 404 rotates. When the bevel gear 403 rotates, it drives the rotating frame 401 to rotate, so that the winding core of the tape measure body 103 moves to the bottom of the pressure roller 402. When the rack 203 moves away from the double-headed gear rod 404, the rotating frame 401 is reset by the force of the torsion spring 405, and the pressure roller 402 is pressed against the rotating frame 401. The top of the winding core is squeezed and limited. During the verification and measurement of the winding core, the tongue 202 is clamped in the limiting hole at the end of the winding core, and the moving vehicle 200 is controlled to drive the tongue 202 on the surface of the connecting plate 201 to move horizontally. The tongue 202 stretches the winding core. When the tongue 202 moves to the bottom of the support frame 104, the rack 203 drives the double-headed gear rod 404 to rotate and mesh. When the double-headed gear rod 404 rotates, it drives the bevel gear 403 to rotate, so that the rotating frame 401 rotates on the inner wall of the support frame 104, and the rotating frame 401 rotates. When the movable frame 401 rotates, the pressure roller 402 at its bottom moves away from the surface of the pad 102, so that the gap between the pressure roller 402 and the pad 102 increases. Therefore, the winding core can fit the surface of the pad 102 and pass under the pressure roller 402. When the latch 202 drives the winding core away from under the current pressure roller 402, the rotating frame 401 is reset by the force of the torsion spring 405, so that the pressure roller 402 presses and limits the winding core on the surface of the pad 102, avoiding the position deviation of the winding core when it moves on the surface of the pad 102, thereby improving the inspection effect.

[0044] Taking into account the different sizes of the tape measure bodies 103 of winding cores of different lengths, in order to facilitate fixing the limiting holes at the end of the tape measure bodies 103 through the latch tongue 202, thereby driving the winding core to stretch for calibration, the adjustment assembly 500 includes a support plate 502 arranged below the latch tongue 202, guide rods 503 are arranged between the two sides of the support plate 502 and the connecting plate 201, and a cylinder 501 is arranged at the bottom of the connecting plate 201. The cylinder 501 penetrates the connecting plate 201 to push the support plate 502, so that the support plate 502 drives the latch tongue 202 to move in the vertical direction to fix the limiting holes at the end of the tape measure bodies 103 of different sizes. The latch tongue 202 is in the shape of a "7", and the width of the latch tongue 202 is smaller than that of the pad 102. The width of the gap formed between the pads 102 is controlled by the piston rod at the end of the control cylinder 501 to drive the tongue 202 to penetrate the pad 102 and move to the limit hole at the end of the tape measure body 103. When the height of the tongue 202 needs to be adjusted, the piston rod at the end of the control cylinder 501 pushes the bottom of the support plate 502 to move, so that the tongue 202 passes through the gap formed between the pads 102. The height is adjusted, which is convenient for fixing the limit holes at the end of the tape measure body 103 of different sizes. Since the wedge block 507 is in a "7" shape, when the tongue 202 passes through the limit hole at the end of the tape measure body 103 and moves horizontally for stretching, the end of the tape measure body 103 can fit tightly against the inner wall of the tongue 202, thereby improving the stability of the stretching.

[0045] After the calibration of the tape measure body 103 is completed, in order to quickly reel in the stretched reel core, the moving vehicle 200 is controlled to drive the latch tongue 202 to move quickly in the opposite direction. The slide column 505 is easy to fall off from the limiting hole at the end of the tape measure body 103 during the movement of the latch tongue 202, causing the reel core to bend and requiring the operator to manually adjust the reel, affecting the reeling efficiency. Therefore, a column barrel 504 is provided on one side of the latch tongue 202, and a slide column 505 is slidingly provided on the inner wall of the column barrel 504. A telescopic spring 506 is provided between the column barrel 504 and the slide column 505, and a wedge block 507 is provided on the top of the slide column 505. When the limiting hole at the end of the tape measure body 103 is fixed on the surface of the latch tongue 202, the end of the wedge block 507 is squeezed by the force of the internal coil spring of the tape measure body 103, so that the slide column 505 provided at the bottom of the wedge block 507 slides on the inner wall of the column barrel 504, through the latch tongue. When the end of the tape measure body 103 is limited by the positioning hole 202, the limiting hole passes through the surface of the latch tongue 202 and is driven to reel in by the force of the coil spring. During the reeling process, the top of the wedge block 507 is pressed, and the wedge block 507 is driven by the extrusion force to drive the slide post 505 to slide on the inner wall of the cylinder 504, and at the same time, the telescopic spring 506 is squeezed. When the reel core is fitted and fixed on the end of the latch tongue 202, the external force on the wedge block 507 disappears, and the telescopic spring 506 applies a reverse force to the slide post 505, so that the wedge block 507 provided at the end of the slide post 505 limits the end of the tape measure body 103. When the calibration operation is completed, the control moving vehicle 200 drives the latch tongue 202 to move quickly in the opposite direction. The limiting of the wedge block 507 can ensure that the latch tongue 202 and the limiting hole at the end of the tape measure body 103 do not fall off, thereby realizing the rapid reeling of the reel core.

[0046] When in use, the tape measure body 103 is placed on the surface of the frame 100, and the output end of the control motor 301 drives the main gear 302 to rotate. When the main gear 302 rotates, it drives the sub-gear 303 to mesh and rotate. When the sub-gear 303 rotates, it drives the screw rod 304 to rotate coaxially. The clamping plate 305 provided on the surface of the screw rod 304 moves relatively, so that the clamping plate 305 moves to the side wall of the tape measure body 103 to clamp and fix it, thereby improving the stability of the tape measure body 103, thereby improving the efficiency of calibration, and controlling the piston rod at the end of the cylinder 501 to drive the tongue 202 to penetrate the pad 102 and move to the limit hole at the end of the tape measure body 103. When the height of the tongue 202 needs to be adjusted, the piston rod at the end of the control cylinder 501 is used to push the bottom of the support plate 502 to move, so that the tongue 202 passes through the gap formed between the pads 102. The height is adjusted, thereby facilitating the fixing of the limit holes at the end of the tape measure body 103 of different sizes.

[0047] The control moving vehicle 200 drives the latch 202 on the surface of the connecting plate 201 to move horizontally, and the latch 202 stretches the winding core. When the latch 202 moves to the bottom of the support frame 104, the rack 203 drives the double-headed gear rod 404 to engage and rotate. When the double-headed gear rod 404 rotates, it drives the bevel gear 403 to rotate, so that the rotating frame 401 rotates on the inner wall of the support frame 104. When the rotating frame 401 rotates, the pressure roller 402 provided at the bottom thereof moves away from the surface of the pad 102, so that the gap between the pressure roller 402 and the pad 102 increases. Therefore, the winding core can fit the surface of the pad 102 and pass under the pressure roller 402. When the latch 202 drives the winding core away from the current pressure roller 402, the rotating frame 401 is reset by the force of the torsion spring 405, so that the pressure roller 402 presses and limits the winding core on the surface of the pad 102, avoiding the position deviation of the winding core when it moves on the surface of the pad 102, thereby improving the inspection effect.

[0048] When the limit hole at the end of the tape measure body 103 is limited by the latch tongue 202, the limit hole passes through the surface of the latch tongue 202 and is driven to be reeled in by the force of the coil spring. During the reeling process, the top of the wedge block 507 is pressed, and the wedge block 507 is driven by the extrusion force to drive the slide post 505 to slide on the inner wall of the cylinder 504, and at the same time, the telescopic spring 506 is squeezed. When the reel core is fitted and fixed at the end of the latch tongue 202, the external force on the wedge block 507 disappears, and the telescopic spring 506 applies a reverse force to the slide post 505, so that the wedge block 507 provided at the end of the slide post 505 limits the end of the tape measure body 103. When the calibration operation is completed, the control vehicle 200 drives the latch tongue 202 to move quickly in the opposite direction. The limitation of the wedge block 507 can ensure that the latch tongue 202 and the limit hole at the end of the tape measure body 103 do not fall off, thereby realizing the rapid reeling of the reel core.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A measuring steel tape calibration device, characterized in that: The invention comprises a frame (100), wherein movable rails (101) are arranged between the frames (100), wherein the movable rails (101) are arranged symmetrically, wherein the surfaces of the movable rails (101) are provided with corresponding scale lines, wherein the side walls of the movable rails (101) are provided with movable vehicles (200), wherein the movable vehicles (200) move along the side walls of the movable rails (101) in a horizontal direction, wherein connecting plates (201) are arranged between the movable vehicles (200), wherein the surfaces of the connecting plates (201) are provided with latching tongues (202), wherein the latching tongues (202) are used to limit the end limit holes of the measuring tape body (103), wherein the surfaces of the movable rails (101) are provided with pads (102), wherein the surfaces of the pads (102) are provided with through grooves (105), wherein one side of the frame (100) is provided with a measuring tape body (103), wherein the measuring tape body (103) is provided with a latching tongue (202), wherein the latching tongue (202) is used to limit the end limit holes of the measuring tape body (103), wherein the surfaces of the movable rails (101) are provided with pads (102), wherein the surfaces of the pads (102) are provided with through grooves (105), wherein the measuring tape body (103) is provided with a latching tongue (202) on the side walls of the measuring tape body (103), wherein the latching tongue (202) is used to limit the end limit holes of the measuring tape body (103), wherein the surfaces of the measuring tape body (103) are provided with latching tongues (202 ... The measuring tape body (103) is provided with a fixing component (300) at the bottom thereof, and the fixing component (300) is used for fixing and limiting the measuring tape body (103). The surface of the pad (102) is provided with a supporting frame (104), and a limiting component (400) is provided inside the supporting frame (104). During the calibration of the measuring tape body (103), the limiting component (400) is used to limit the winding core stretched by the measuring tape body (103), so that the winding core moves in contact with the surface of the pad (102). An adjusting component (500) is provided below the latch tongue (202), and the adjusting component (500) is used for adjusting the height of the latch tongue (202), and at the same time, reinforcing the latch tongue (202) and the limiting hole at the end of the measuring tape body (103) during the movement.

2. The measuring steel tape calibration device according to claim 1, characterized in that: The fixing assembly (300) comprises a motor (301) arranged below the tape measure body (103); a main gear (302) is arranged at the output end of the motor (301); sub gears (303) are arranged on both sides of the main gear (302); a screw rod (304) is arranged at the end of the sub gear (303); a clamping plate (305) is arranged on the surface of the screw rod (304); when the screw rod (304) rotates, the clamping plate (305) is driven to move relatively.

3. The measuring steel tape calibration device according to claim 1, characterized in that: A gap is provided between the pads (102) provided on the surface of the movable rail (101), the width of the gap is smaller than the width of the core of the measuring tape body (103), and the core moves on the surface of the pads (102) when subjected to the pulling force of the latch tongue (202).

4. The measuring steel tape calibration device according to claim 1, characterized in that: A rack (203) is provided on the top of the moving vehicle (200), and the rack (203) passes through the through slot (105) and moves on the surface of the pad (102). A limiting assembly (400) is provided on one side of the pad (102).

5. The measuring steel tape calibration device according to claim 3, characterized in that: The limiting assembly (400) comprises a rotating frame (401) arranged inside the supporting frame (104); a supporting rod is arranged on the side wall of the rotating frame (401); the supporting rod rotates inside the supporting frame (104); a pressure roller (402) is arranged at the bottom of the rotating frame (401); a rubber pad is arranged at the bottom of the pressure roller (402); the rubber pad is in contact with the surface of the pad (102).

6. The measuring steel tape calibration device according to claim 5, characterized in that: A torsion spring (405) is provided between the support frame (104) and the support rod, and the rotating frame (401) rotates inside the support frame (104). In a natural state, the rotating frame (401) is perpendicular to the horizontal plane due to the force of the torsion spring (405).

7. The measuring steel tape calibration device according to claim 5, characterized in that: A bevel gear (403) is provided on the surface of the support rod, and a double-headed gear rod (404) is provided below the bevel gear (403). When the mobile vehicle (200) drives the connecting plate (201) to move, the rack (203) provided on the top of the mobile vehicle (200) drives the double-headed gear rod (404) to mesh and rotate, so that the bevel gear (403) provided above the double-headed gear rod (404) rotates. When the bevel gear (403) rotates, it drives the rotating frame (401) to rotate, so that the winding core of the tape measure body (103) moves to below the pressure roller (402). When the rack (203) is away from the double-headed gear rod (404), the rotating frame (401) is reset by the force of the torsion spring (405), and the top of the winding core is squeezed and limited by the pressure roller (402).

8. The measuring steel tape calibration device according to claim 1, characterized in that: The adjustment assembly (500) comprises a support plate (502) arranged below the latch tongue (202), guide rods (503) are arranged between the two sides of the support plate (502) and the connecting plate (201), and a cylinder (501) is arranged at the bottom of the connecting plate (201), and the cylinder (501) penetrates the connecting plate (201) to push the support plate (502), so that the support plate (502) drives the latch tongue (202) to move in a vertical direction, thereby fixing the end limit holes of the tape measure body (103) of different sizes.

9. The measuring steel tape calibration device according to claim 8, characterized in that: The latch tongue (202) is in the shape of a letter "7", and the width of the latch tongue (202) is smaller than the width of the gap formed between the backing plates (102). The piston rod at the end of the control cylinder (501) drives the latch tongue (202) to penetrate the backing plate (102) and move to the end limit hole of the tape measure body (103).

10. The measuring steel tape calibration device according to claim 9, characterized in that: A column (504) is provided on one side of the latch tongue (202), a sliding column (505) is slidably provided on the inner wall of the column (504), a telescopic spring (506) is provided between the column (504) and the sliding column (505), a wedge block (507) is provided on the top of the sliding column (505), and when the limiting hole at the end of the tape measure body (103) is fixed on the surface of the latch tongue (202), the end of the wedge block (507) is squeezed by the force of the internal coil spring of the tape measure body (103), so that the sliding column (505) provided at the bottom of the wedge block (507) slides on the inner wall of the column (504).

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