MEASURING DEVICE FOR MARKING CONTROL POINTS WITH A MAGNETIC-BASED DIGITAL

Description

[0001] This utility model relates to mechanical measuring devices that can be used in work related to determining the linear dimensions of objects and parts, taking into account radial angles for applying control points, for example, during non-destructive testing of complex cylindrical equipment. In preparation for measuring the test object at control points, drawings and technical documentation are analyzed to detail the location of the control points and transfer the marks to the test object's surface for precise positioning of the measuring equipment. Control points are applied using any markers, templates, or devices for precise positioning, taking into account distances, their scale, and the complex surface of the elements. To accurately transfer radii and arcs from the object's unfolded surface to its surface, a set of measuring equipment is used, and control points are applied to the object based on the drawing parameters.All control points must be located in coordinates corresponding to the drawing, taking into account scale factors, which is a complex and labor-intensive task: the work of determining linear dimensions and applying control points on complex spatial objects requires a combination of precision, speed and accuracy.

[0002] A device [US 6044572 A, 04.12.1997; Text: electronic / / website. - URL: https: / / worldwide.espacenet.com / patent / search / family / 025531475 / publication / US6044572A?q=US 6044572 A (accessed 02.10.2025)] for mechanically determining the geometric parameters of pipes based on the circumference of the object under study is known from the existing technology. The disadvantage of the device is the impossibility of fixing the measurement start point without additional devices, the impossibility of establishing the value of the angle between the cylinder generators and the device tape.

[0003] Accounting for distances between control points using tape measures such as [US 6044572 A, 12 / 15 / 2017; Text: electronic / / site. - URL: https: / / worldwide.espacenet.com / patent / search / family / 025531475 / publication / US6044572A?q=US6044572A (accessed 10 / 02 / 2025)], [CN207600325U⋅07 / 10 / 2018; Text: electronic / / site. - URL: https: / / worldwide.espacenet.com / patent / search / family / 025531475 / publication / US6044572A?q=US6044572A (accessed 02.10.2025)] does not allow achieving the required accuracy when transferring control points to a non-flat surface of equipment.

[0004] The task that the claimed device is aimed at solving is to increase the speed and accuracy of transferring the location of control points from the scan to the surface of the equipment.

[0005] This problem is solved by offering a device with a closed housing, a retractable measuring tape with a magnetic lock, mutually perpendicular T-levels, characterized in that the housing is rigidly fixed to a limb with radial scales with the possibility of axial rotation relative to the limb, and the limb is attached to the measured surface with magnetic feet.

[0006] The technical result provided by the given set of features is an increase in the accuracy of transferring the location of control points depicted on a diagram, development or drawing of equipment to the surface of the equipment with reference to the location of control points to the elements of the vessel or welded joints in the field at the location of the equipment without its transportation

[0007] This magnetic-based marking device is designed for measuring the linear dimensions of flat and solid surfaces of process equipment parts by direct comparison with a scale. It consists of a closed housing with T-levels and a polymer-coated steel measuring tape with a magnetic clasp, a rotating circular base (limb), and magnetic feet. The device housing is shaped like a parallelepiped, with metric markings applied to one of its perimeter edges. Mutually perpendicular bubble T-levels are attached to the top and side edges. The tape, when rolled up, is protected by the device housing and held in the folded position by a spring mechanism. The device housing is secured to the limb, allowing axial rotation without deviation from the perpendicular axis. The limb cylinder is equipped with radial scales on the side and top surfaces.The radial scales rotate in 90° increments, with the scales on the side and top surfaces offset by 45°. The lower base of the dial cylinder is equipped with four magnetic feet in the form of flat cylinders. When transferring control points from a scanned pattern, drawing, or other technical documentation to the surface of the objects being examined, after correlating the spatial angles and scaling the distances, the proposed device is installed over the initial control point, securing the device with the dial's magnetic feet so that the initial control point coincides with the center of the dial. The device's tape is marked with scales: metric and inch markings. The scales are graduated to account for the linear distance from the measurement point to the center of the dial.If the measurement start point shifts from the center of the dial, metric scales on the edges of the device body are provided for calculating the error. The measuring scale on the device body can serve as an auxiliary tool for transferring points to the object's surface. The device's position in space and relative to the object's surface is controlled using two T-levels. Rotating the device body relative to the dial sets the direction of the device's tape advancement for measuring the required distance. Once the direction for measuring the distance is set, the device's tape is advanced to the required length and fixed at this distance using the magnetic tape clamp. The magnetic clamp is a double flexible bar with magnets on the short ends, perpendicularly attached to the edge of the measuring tape.Using a magnetic clamp of this design prevents the measuring tape from slipping off the equipment surface and accounts for surface curvature. A mark is made at the resulting point with any convenient marker. The measuring device with the tape securely attaches to ferromagnetic surfaces, as a set of magnets on the legs and clamp prevents the device from shifting.

[0008] The essence of the utility model is explained by the drawings Fig. 1 - a front view of the device, Fig. 2 - a top view of the device, Fig. 3 - a rear view of the device, Fig. 4 - a bottom view of the device, Fig. 5 - a sectional view of the device, Fig. 6 - a top view of the device when the housing is rotated relative to the limb, where:

[0009] 1 - body;

[0010] 2 - T-level;

[0011] 3 - measuring tape;

[0012] 4 - magnetic latch;

[0013] 5 - limb;

[0014] 6 - magnetic feet;

[0015] 7 - measuring scale of the tape measure body;

[0016] 8 - magnets.

[0017] The device for marking with a limb on a magnetic base (hereinafter referred to as the device) consists of a closed housing (1) with T-levels (2) with a measuring tape (3) made of steel with a polymer coating with a magnetic lock (4), a round base (limb) (5) with the ability to rotate and on magnetic legs (6). The housing (1) of the device is made in the form of a parallelepiped, while markings in the metric system are applied to one of the edges along the perimeter (). Mutually perpendicular bubble T-levels (2) are fixed to the upper and side edges of the housing (1). The measuring tape (3) is protected when not in use by the housing (1) of the device and is held in the folded state by a spring mechanism. The housing (1) of the device is fixed on the limb (5) with the ability to rotate axially without deviating from the axis of the perpendicular. The cylinder of the limb (5) is provided with radial scales on the side and top surfaces.The pitch of the radial scale rotation angle is 90°, while the scales of the side and upper surfaces are shifted relative to each other by 45°. The lower base of the cylinder of the limb (5) is equipped with four magnetic feet (6) in the form of flat cylinders. When carrying out work on transferring control points from a scan, drawing or other technical documentation to the surface of the objects under study, after correlating the spatial angles and scaling the distances, the proposed device is installed above the initial control point, fixing the device above the control point using the magnetic feet (6) of the limb (5) in such a way that the initial control point coincides with the center of the limb (5). Scales are applied to the measuring tape (3) of the device: markings in the metric system and inch markings. The scales are graduated in such a way that the linear distance from the measurement point to the center of the limb (5) is taken into account.In case of displacement of the measurement start point from the center of the limb (5), measuring scales in the metric system are provided on the device body (1) for calculating the error. The measuring scale on the device body (1) can serve as an auxiliary one when transferring points to the object surface. The position of the device in space and relative to the object surface is controlled using two bubble T-levels (2). By rotating the device body (1) relative to the limb (5), the direction of extension of the measuring tape (3) of the device for counting the required distance is set. Having set the direction for counting the distance, the device tape (3) is extended to the required length and the edge of the measuring tape (3) is fixed with the magnetic clamp (4) of the measuring tape (3). The magnetic clamp (4) is a double flexible bar with magnets (8) on the short edges, permanently fixed and perpendicular to the long side of the measuring tape by an assembly operation.The magnetic clamp (4) serves as the reference point for distance measurements. Using a magnetic clamp (4) of this design prevents the measuring tape from slipping off the equipment surface and accounts for complex surface geometries. A mark is made at the resulting point using any convenient marker. The measuring device with the tape is firmly fixed to ferromagnetic surfaces, as a set of magnets on the legs and clamp prevents the device from shifting, ensuring high measurement speed and reducing errors.

Claims

A measuring device for marking control points with a limb on a magnetic base with a closed housing, a retractable measuring tape with a magnetic lock, mutually perpendicular T-levels, characterized in that the housing is rigidly fixed to the limb with radial scales with the possibility of axial rotation relative to the limb, and the limb is attached to the measured surface with magnetic feet.

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