Measuring and positioning tool for magnetic shielding panel

Abstract

The invention provides a magnetic shielding panel measuring and positioning tool which comprises a tool base body installed on a magnetic shielding panel section bar, and the tool base body comprises a reference seat and a measuring assembly detachably connected to the upper portion of the reference seat. An inserting part is arranged at the bottom of the reference seat, and is matched with a tongue-and-groove of the profile to form a measuring reference; the measuring assembly comprises a vertical stand column and spacing measuring pieces symmetrically arranged on the two sides of the stand column. The spacing measuring piece can slide along the height direction of the stand column, and the measuring end extends to the upper surface of the magnetic shielding panel. According to the scheme, the insertion part at the bottom of the tool base body is in small clearance fit with the rabbet of the profile to form a stable measurement reference, and precise positioning is achieved by combining the bilateral spacing measurement pieces symmetrically arranged on the vertical stand column. The height of the distance measuring piece can be longitudinally adjusted to extend to the upper surface of the panel, the influence of an installation inclination angle is eliminated through a self-adaptive structure, the operation difficulty of constructors is remarkably reduced while the precision is ensured, and the core defect that the adaptability to complex working conditions is insufficient in the prior art is overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of measurement positioning tooling, in particular to a measurement positioning tooling for a magnetic shielding panel. BACKGROUND

[0002] In the construction of magnetic shielding structures of large facilities such as large low-magnetic spaces, the installation accuracy of permalloy panels directly affects the shielding effectiveness of the magnetic field. The traditional construction adopts a positioning method of manual visual inspection combined with simple measuring tools. The system has defects: the construction personnel need to repeatedly adjust the panel position, observe the alignment of the panel edge and the reference mark with the naked eye, and measure the distance with a steel ruler or tape measure. This method relies on the experience of the constructor and is particularly inefficient in curved installation scenarios (such as reactor domes). Actual measurement data shows that the average adjustment time of a single panel exceeds 5 minutes, and the final positioning error rate is high, which is difficult to meet the installation requirements of high-precision magnetic shielding structures.

[0003] To solve the above problems, existing solutions, such as the "distance measuring device and method for power grid planning" disclosed in Chinese patent document "CN117006370A", include a distance measuring device and a mounting base installed at the bottom of the distance measuring device. It also includes a connecting table installed below the mounting base, which is symmetrically provided with two sets of clamping structures for limiting the mounting base. An angle adjustment assembly is installed below the connecting table for rotating adjustment of the distance measuring device. A height adjustment assembly is provided below the bottom plate for up and down adjustment of the distance measuring device. The height adjustment assembly is movably connected to a box, which is used to store the distance measuring device. Another improved solution uses a laser range finder, which can achieve non-contact measurement, but requires manual calculation of spatial coordinates, and the operation process is complex and cannot provide real-time feedback on position deviation.

[0004] In summary, the above-mentioned solutions have simplified the testing process and reduced the calculation of cumulative data. However, there are still many unresolved problems: first, using a traditional vernier to measure and install requires repeated reading and adjustment of the distance on both sides, which not only delays the construction progress and reduces efficiency, but also causes attention decline due to repeated operations. Second, since the panels are not all installed horizontally, there are also parts installed at an angle, and manual measurement is prone to errors when judging the contact state of the measuring piece and the panel, which may result in the measuring piece not being in contact with the panel before reading and completing the measurement and installation. Third, outdoor construction is used for magnetic shielding panel installation, and metal panels are easily affected by environmental temperature changes, causing thermal expansion and resulting in measurement reference drift, which affects construction quality. These problems have not been practically solved and are real industry pain points. SUMMARY

[0005] The first invention of the scheme is to solve the problems of measurement error and low efficiency caused by the change of inclination angle in the installation of magnetic shielding panels, and to form a fixed measurement reference by the small gap cooperation of the plug-in part at the bottom of the tool base with the profile tongue and groove, and to realize the inclination-independent direct-reading distance positioning by the means that the spacing measurement pieces symmetrically arranged on both sides of the vertical column can slide along the height and extend to the upper surface of the panel, so as to eliminate the influence of installation inclination angle and improve the installation precision and construction efficiency. The second invention of the scheme is to solve the problem of lack of non-contact high-precision positioning and real-time feedback in large magnetic shielding facilities, and to realize the displacement detection and hierarchical acousto-optic prompt of the edge of the magnetic shielding panel by the generation of double-wavelength moire fringe by the laser projection module combined with the differential signal processing of the photoelectric detector, so as to avoid the damage of the plating layer and reduce the manual error, and at the same time improve the detection efficiency and delay the work fatigue. The third invention of the scheme is to solve the problem of reference drift caused by metal thermal expansion in the diurnal temperature difference environment, and to maintain the stability of the measurement reference by the phase change compensation mechanism of the thermal expansion layer of the reference seat. The fourth invention of the scheme is to solve the problem of false judgment of contact state caused by uneven surface of the panel, and to realize the visual guidance of local contact force anomaly by the pressure sensing unit at the end of the spacing measurement piece and the partition color development system.

[0006] In order to achieve the above-mentioned purposes, the following technical solutions are adopted in the present application: A measurement and positioning tool for magnetic shielding panels, comprising a tool base installed on the profile between the magnetic shielding panels, wherein the tool base comprises a reference seat and a measurement assembly detachably connected above the reference seat; the bottom of the reference seat is provided with a plug-in part, which cooperates with the tongue and groove of the profile to form a measurement reference; the measurement assembly comprises a vertical column and spacing measurement pieces symmetrically arranged on both sides of the column; the spacing measurement pieces can slide along the height direction of the column, and the measurement end extends to the upper surface of the magnetic shielding panel.

[0007] The tool base of the scheme forms a physical reference by the small gap cooperation of the plug-in part at the bottom of the reference seat with the profile tongue and groove, eliminating the reference drift problem of traditional manual visual measurement. The double-sided spacing measurement pieces on the vertical column can slide along the height, and the measurement end extends to the upper surface of the magnetic shielding panel to realize the edge positioning, ensuring that the distance between the edge of the shielding panel and the measurement reference meets the preset standard. The symmetrical layout of the measurement pieces can adapt to different inclination angles within fifteen degrees through independent sliding, solving the interference problem of traditional vernier in concave / convex surface installation. The modular design of the reference seat and the measurement assembly allows quick disassembly and assembly, adapts to narrow space operation, and shortens the actual single board adjustment time from 5-10 minutes to 3 minutes, and improves the installation precision from ±3mm to ±1mm.

[0008] As preferred, the column is fixedly connected with the reference seat through a connecting piece; the plug-in part has a downward extending plug pin; the cross section profile of the plug pin matches the profile of the inner wall of the profile groove; the plug pin is in small gap cooperation with the profile groove.

[0009] As preferred, the spacing measuring members on both sides of the column can be independently adjusted respectively; the spacing measuring members contain measuring head assemblies matching the angle of the magnetic shielding panel.

[0010] As preferred, the measuring head assembly comprises an adaptive profiling ruler which can abut against the angle of the magnetic shielding panel and adjust the extension direction of the bottom measuring scale.

[0011] As preferred, the top of the column is integrated with a laser projection module; the laser projection module contains: a red laser emitting unit and a blue laser emitting unit arranged side by side; a diffraction grating plate fixed in front of the emitting unit; the diffraction grating plate is configured to generate a red parallel stripe group and a blue parallel stripe group with the same spacing; and make the two stripe groups form an overlapping projection area at the edge of the magnetic shielding panel at a preset position.

[0012] As preferred, a cantilever bracket is fixed on the side wall of the column; a photoelectric detector is installed at the end of the cantilever bracket; the optical axis of the photoelectric detector is perpendicular to the installation plane of the magnetic shielding panel; the lens center of the photoelectric detector is at the same height as the center of the overlapping projection area; the output end of the photoelectric detector is connected with a prompt device through a signal processing circuit.

[0013] As preferred, the measuring end of the spacing measuring member is provided with a contact detection member; a pressure sensing unit is embedded in the contact detection member; the contact surface of the pressure sensing unit can match the upper surface of the magnetic shielding panel.

[0014] As preferred, the contact detection member comprises a ring-shaped color developing groove arranged around the length direction of the spacing measuring member; a color developing tape is embedded in the ring-shaped color developing groove; the color developing tape comprises a plurality of LED units arranged along the length direction; each LED unit is connected with the partitioned output end of the pressure sensing unit through an independent lead wire; the partitioned output end of the pressure sensing unit corresponds to the position of the LED unit one by one.

[0015] As preferred, the reference seat contains a first base and a second base which can slide relative to each other; an adjusting screw is arranged along the width direction between the first base and the second base; a lock piece is arranged on the first base and the second base to fix them; a thermally sensitive expansion layer is detachably arranged on the side wall of any side of the reference seat along the width direction.

[0016] As preferred, the bottom of the reference seat is provided with a mounting hole, a fastening bolt is mounted in the mounting hole from bottom to top, the fastening bolt comprises a screw rod part connected to the mounting hole and a limiting head placed below the reference seat, the limiting head comprises at least two limiting parts extending outward along the radial direction of the limiting head, and the limiting parts can be connected with the tongue and groove hooks of the profile.

[0017] The present application has the following beneficial effects: The tool body forms a stable reference through the gap fit of the plug-in part and the profile tongue and groove, eliminates the reference drift problem of manual visual measurement, and improves the installation accuracy to ±1mm.

[0018] The double-sided distance measuring element independently slides and extends to the upper surface of the panel, automatically adapts to the inclination change of the magnetic shielding panel, and solves the interference problem of the traditional vernier when installed on a concave / convex surface.

[0019] The laser projection module combines with a photoelectric detector to realize non-contact displacement detection, amplifies the displacement signal through a Moire fringe, avoids scratching the plating layer, and significantly improves the efficiency.

[0020] The modular reference seat and the measuring assembly support quick disassembly and assembly, adapt to narrow space operation, shorten the single board adjustment time to 3 minutes, and reduce the operation difficulty of construction personnel. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a working schematic diagram of the tool body in the present application.

[0022] Figure 2 It is Figure 1 An enlarged view of position A in FIG.

[0023] Figure 3 It is a front view of the inside concave panel in the present application.

[0024] Figure 4 It is Figure 3 An enlarged view of position B in FIG.

[0025] Figure 5 It is a structural schematic diagram of the tool body in Example 2.

[0026] Figure 6 It is a structural schematic diagram of the tool body in Example 2.

[0027] Figure 7 It is a structural schematic diagram of the tool body in Example 3.

[0028] Figure 8 It is an optical path diagram of the laser projection module in the tool state in Example 3.

[0029] In the figure: 100, profile, 101, tongue and groove, 200, magnetic shielding panel, 201, inner concave panel, 1, reference seat, 11, plug-in portion, 111, pin, 12, first base, 13, second base, 14, spacing adjustment member, 15, bolt, 16, locking member, 2, measuring assembly, 21, column, 22, spacing measurement member, 221, measuring head assembly, 222, adaptive profiling ruler, 223, measuring marking, 23, contact detection member, 24, color display slot, 25, color display strip, 26, inclined spacer, 27, scale film, 3, laser projection module, 31, red laser emitting unit, 32, blue laser emitting unit, 33, diffraction grating plate, 34, red parallel stripe group, 35, blue parallel stripe group, 36, overlapping projection area, 37, cantilever bracket, 38, photodetector, 4. Tightening bolt, 41, screw portion, 42, limiting head, 421, limiting portion. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0031] Example 1 like Figure 1 、 2 As shown, in this embodiment, the tooling base is composed of a reference base 1 and a detachable measuring component 2, wherein the plug-in portion 11 at the bottom of the reference base 1 is provided with a pin 111 extending downward. The cross-sectional profile of the pin 111 strictly matches the shape of the inner wall of the profile tongue and groove 101, such as the trapezoidal cross-section of the I-beam slot, and forms a physical reference by controlling the small gap within 0.1 mm. This matching method completely eliminates the problem of reference drift caused by traditional caliper clamping. The vertical column 21 of the measuring component 2 is fixed to the top of the reference base 1 by bolts 15 to ensure that no displacement occurs during construction vibration. The spacing measuring pieces 22 symmetrically arranged on both sides of the column 21 can slide independently along the height direction of the column 21, and their measuring ends extend to the upper surface of the magnetic shielding panel 200. In this embodiment, the magnetic shielding panel 200 uses a Permalloy panel to avoid direct contact with the coating during measurement and causing damage.

[0032] The measuring head assembly 221 at the end of the distance measuring member 22 comprises an adaptive profile gauge 222 which abuts the surface of the permalloy panel through a hinged mechanism. When the inclination of the panel changes, for example in the case of a concave inner surface or a convex outer surface of the net shell, the profile gauge automatically deflects to a state parallel to the panel plane. The measuring scale 223 at the bottom synchronously adjusts the direction, so that the scale is always perpendicular to the edge of the panel. Specifically, when a thirteen-degree inclined panel is installed, the scale deflects thirteen degrees to output the true distance value, fundamentally solving the projection error problem of the horizontal vernier. This dynamic adaptive mechanism replaces the cumbersome process of replacing special accessories in the traditional way.

[0033] The reference seat 1 is composed of a first base 12 and a second base 13, and the width is steplessly adjusted through the adjustment gap adjusting member 14. In this embodiment, the adjustment gap adjusting member adopts an adjustment bolt, which can adapt to the size change of the profile 100 of twenty to fifty millimeters. The side wall is detachably installed with a heat-sensitive expansion layer, and in this embodiment, a paraffin composite material is used to realize the temperature compensation function. When the ambient temperature fluctuates during construction, the difference in the expansion coefficient between this material and the metal matrix produces deformation compensation, effectively preventing reference drift. The bottom mounting hole is loaded from bottom to top with a fastening bolt 4, which is connected to the reference seat through a screw rod part 41, and the radial limiting part 421 of the limiting head 42 is designed as an L-shaped hook structure, which can hook the profile groove 101 hook to form a bidirectional mechanical lock. This installation method significantly improves the disassembly and assembly efficiency, and is particularly suitable for the working condition that the tool needs to be placed laterally through the gap between the permalloy panels in a narrow space.

[0034] In this scheme, the small gap fit of the pin 111 eliminates the displacement gap through mechanical interference, and the fitting tolerance of minus zero point one to minus zero point two millimeters can withstand twenty times the construction vibration load, which is verified by finite element analysis, so that the reference accuracy is stabilized within plus or minus zero point zero five millimeters. The hinged mechanism of the adaptive profile gauge 222 adopts a low-friction coefficient expansion structure or an elastic structure, which has a deflection resistance of less than zero point one newton within a zero-degree to fifteen-degree inclination range, ensuring that the scale line follows the panel plane changes in real time and eliminates the error caused by the angle. The paraffin composite material of the heat-sensitive expansion layer has linear expansion characteristics in the range of minus ten degrees Celsius to fifty degrees Celsius, with a deformation amount of zero point zero five millimeters per degree Celsius, maintaining the installation accuracy within plus or minus one point five millimeters.

[0035] In addition, those skilled in the art can further extend the technical solutions, such as replacing the pin 111 with a single pin 111, a double pin 111 or a three-pin 111 base structure to match the special-shaped groove 101. This design is derived from the classification data of three types of grooves 101 in the aluminum alloy net shell acceptance test. The scale mark of the self-adaptive profiling ruler 222 can be replaced by a combination of a beveled pad 26 and a scale sticker. This scheme has been verified in the scale model test to meet the measurement requirements of zero to fifteen degrees of inclination. The angle range includes inward inclination to fifteen degrees and outward inclination to fifteen degrees. The thermal expansion layer can be replaced by a bimetallic strip compensation structure, which uses the thermal expansion difference of different metals to achieve temperature self-adaptation. The limiting portion 421 of the fastening bolt 4 can be replaced by a T-shaped bolt rotating lock, which completes the tool fixing by rotating ninety degrees. This method improves the efficiency by seventy percent in the process of placing the tool laterally.

[0036] In this embodiment, the small gap between the pin 111 and the profile groove 101 is controlled within one millimeter. When the cross-sectional profile of the pin 111 completely matches the inner wall of the I-beam slot, the microscopic deformation caused by mechanical interference forms a self-locking effect. In the construction vibration environment, this matching method eliminates the displacement gap through intermolecular forces, which directly compresses the measurement reference drift to within plus or minus zero point five millimeters, completely solving the reference instability problem caused by traditional caliper clamping.

[0037] The physical nature of the self-adaptive profiling ruler 222 is a profile reproduction mechanism. A needle foot profile gauge type ruler can be used to measure the fit of each angle magnetic shielding panel 200, or it can be composed of multiple layers of flexible silicone sheets. When it contacts the surface of the permalloy panel (such as the concave surface inside the net shell or the convex surface outside), the silicone layer deforms elastically under contact pressure, accurately reproducing the local curvature of the panel surface. The bottom measurement scale 223 is linked to the deformation layer through a linkage mechanism, for example, when the panel is at a thirteen-degree inclination, the deformation layer compression difference drives the scale to deflect thirteen degrees synchronously, ensuring that the scale direction is always perpendicular to the tangent of the panel edge. This process replaces manual visual alignment and controls the reading error to within zero point two millimeters at a ten-degree inclination.

[0038] In this embodiment, the column is provided with a scale line along the length direction to form a longitudinal measuring ruler, which is used for the construction personnel to quickly read the height of the distance measuring piece between the two sides of the column. The column includes but is not limited to single rod, double rod, electronic display screen and other forms. The single rod type column is suitable for the scheme of synchronous adjustment of the distance measuring piece between the two sides of the column, the double rod type column is suitable for the scheme of independent adjustment of the distance measuring piece between the two sides of the column, and the column installed with the electronic display screen has stronger universality and can be adapted to various distance measuring rulers to realize fast and accurate height measurement.

[0039] Further, the operator can also cancel the use of the spacing measuring element 22 in the actual work process, directly measure the horizontal distance and height of the magnetic shielding panel on both sides of the stand from the measurement reference through the construction personnel carrying the scale, so as to judge whether the installation error occurs, which makes the structure of the tooling base more simple, and this is the basic measurement scheme.

[0040] The temperature compensation function of the heat-sensitive expansion layer is based on the material phase change principle. The paraffin composite material presents linear expansion characteristics in the range of minus ten degrees Celsius to fifty degrees Celsius, and the difference in expansion coefficient with the metal matrix forms a compensation amount. When the ambient temperature rises by one degree Celsius, the heat-sensitive layer expands by zero point five millimeters, which exactly offsets the thermal extension of the metal matrix. This passive compensation does not require external energy, and in a large low-magnetic space with a day-night temperature difference of thirty degrees Celsius, the deformation amount of the reference seat 1 is successfully limited to plus or minus zero point three millimeters, maintaining the overall installation accuracy within plus or minus one millimeter.

[0041] The special working condition response capability further embodies the technical advantage. When working in a narrow space (the gap between the permalloy panels is less than or equal to 30mm), the L-shaped limiting head 42 of the fastening bolt 4 is locked with the profile 100 hook through a ninety-degree rotation, and the tooling can be placed laterally through the gap and then installed. In a large temperature difference environment, the heat-sensitive expansion layer cooperates with the adjusting screw: the adjusting screw solves the width manufacturing tolerance of the profile 100, and the heat-sensitive layer compensates for the temperature deformation, which double guarantees the stability of the reference. The surface plating protection is realized through the low pressure threshold of the contact detection element 23, and the zero point five newton trigger value ensures that no scratches are generated when the measurement end touches the surface.

[0042] Each subsystem cooperates to form a complete solution: the mechanical locking of the reference seat 1 establishes an absolute reference, the dynamic adaptation of the measurement assembly 2 eliminates the angle variable, the heat compensation mechanism resists environmental interference, and the intelligent feedback reduces human error. This integrated design enables the tooling to simultaneously meet the three core needs of high precision, high efficiency, and low threshold for magnetic shielding installation in large low-magnetic spaces.

[0043] In actual application, the construction personnel first aligns the pins 111 at the bottom of the reference seat 1 with the profile rebate 101, and forms a small gap fit between the pins 111 and the inner wall of the rebate 101 by slightly pressing down. At this time, the self-locking effect is generated by the close fitting of the cross-sectional profile of the pins 111 with the I-beam card slot, and the reference seat 1 is firmly fixed in the measurement position. Then the vertical stand 21 of the measurement assembly 2 is inserted into the top card slot of the reference seat 1, and the bolt 15 is tightened to complete the rigid connection, ensuring that the stand 21 does not shake during subsequent operations.

[0044] When adjusting the distance measuring member 22, the construction personnel slides the measuring member on both sides of the stand 21 to the predetermined height according to the spatial position of the bimetal panel. When the measuring end approaches the panel surface, the flexible silica gel layer of the self-adapting profile gauge 222 is in contact with the bimetal. For example, when installing the concave panel inside the net shell, the silica gel layer in the middle of the profile gauge is subjected to greater pressure and generates deep deformation, and the deformation in the edge area is smaller, thereby accurately reproducing the concave curvature. The bottom measuring scale 223 is automatically deflected by the connecting rod mechanism according to the deformation state, so that the scale direction is always perpendicular to the tangent of the panel edge. The construction personnel directly reads the scale value indicated by the scale, without manual calculation of projection compensation. In the embodiment, the distance measuring member 22 can also use a single ruler to directly measure the distance.

[0045] The environmental adaptability operation is embodied in two aspects: when encountering day and night temperature difference, the heat-sensitive expansion layer automatically compensates the deformation of the metal matrix to maintain the stability of the reference; and when facing different width profiles 100, the construction personnel rotates the adjusting screw to make the first base 12 and the second base 13 slide relative to each other, so as to expand or shrink the width of the reference seat 1 to match the size. After installation is completed, the L-shaped limiting head 42 of the fastening bolt 4 hooks the profile gap 101 from below, and mechanical locking is achieved by rotating one quarter of a circle. When working in a narrow space, the tool can be laterally inclined to pass through the gap between the bimetal panels, and after resetting, the limiting head 42 can still accurately hook the gap.

[0046] In a practical application of a certain project, the tool realizes full-process optimization: the reference installation time is shortened from five minutes in the traditional method to thirty seconds; relying on the LED pressure distribution prompt, the construction personnel only needs an average of three times of fine adjustment to reach the standard; the thermal compensation mechanism ensures that the cumulative reference drift is less than zero point three millimeters in thirty degrees Celsius temperature difference environment such as coastal area for seven days of continuous construction. The whole operation process does not require professional measurement knowledge.

[0047] The tool is disassembled in a reverse process: first, loosen the fastening bolt 4 to release the hooking of the limiting head 42, then remove the bolt used to connect the stand and the reference seat, then open the lock piece 16 to separate the first base 12 and the second base 13, and finally lift the reference seat 1 to make the plug 111 disengage from the profile gap 101. Modular design allows independent maintenance of each component, such as replacing the worn silica gel deformation layer or LED unit, which greatly reduces the operation and maintenance cost.

[0048] Embodiment 2 As Figure 6As shown, in this embodiment, the measuring end of the distance measuring member 22 is additionally provided with a contact detection member 23, and the internal pressure sensing unit is set to a zero point five Newton trigger threshold, and outputs a signal when the surface of the permalloy is lightly touched. The LED unit embedded in the annular color development groove 24 is partitioned to correspond to the pressure sensing area, and if the local contact force is abnormal due to unevenness of the panel surface, the corresponding position LED will immediately light up. For example, when the left side contact force exceeds the limit, the left side LED is lit, accurately guiding the construction personnel to make targeted adjustments, avoiding the positioning ambiguity defect of traditional overall alarm. The LED partitioned color development system converts the contact force distribution into thirty-six segment light signals through spatial discrete sampling of the pressure sensing unit, allowing the construction personnel to quickly identify uneven areas, and reducing the adjustment error rate by ninety percent. The operation fault tolerance of the contact detection member 23 is derived from the spatial discrete sampling design. The annular color development groove 24 is covered with a color development strip 25, and the back of the color development strip 25 is provided with thirty-six LED units respectively connected to independent pressure sensing partitions. When there is a local protrusion on the surface of the permalloy panel, such as sand and other debris, the over-limit contact pressure triggers the corresponding area LED to light up. For example, when the contact force of the third segment on the left side exceeds zero point five Newton, the LED of the segment emits red light, clearly indicating the local position that needs to be adjusted. This visual feedback mechanism reduces the construction personnel's adjustment error rate by ninety percent. In the actual measurement of a large low-magnetic space project, the average adjustment time of a single panel is shortened from fifteen minutes to three minutes.

[0049] In actual construction, the contact detection member 23 plays a role when the measuring end lightly touches the surface of the panel. When the local contact pressure exceeds zero point five Newton, the LED unit of the corresponding partition of the annular color development groove 24 lights up red light. If the permalloy panel is installed at an angle, causing abnormal pressure on the right side, the right side LED group will continuously light up, prompting the construction personnel to adjust the fastening bolt 4 on that side first. This visual guidance significantly reduces the operation threshold, and the construction team can quickly locate the problem area.

[0050] In addition, in this embodiment, as shown in Figure 3 、 4 , in the face of V-shaped installation positioning (curved surface panel outside the net shell) and inverted V-shaped installation positioning (concave surface panel 201 inside), instead of using the adaptive profiling ruler 222 mentioned in embodiment 1, a combination of inclined pad 26 and scale sticker 27 is directly used. As shown in Figure 3 、 5As shown, according to the measured working condition requirement of the inward inclination of the ten degrees of the permalloy panel, the top surface of the inclined block 26 is processed into a thirteen-degree inclined plane. The angle design ensures that the maximum expected inclination working condition can be covered, and the bottom surface of the hard aluminum alloy material block is rigidly connected with the vernier scale through screws. The scale sticker is composed of an anti-wear coating and fluorescent scale lines, and its base adhesive layer is firmly attached to the top surface of the block, and the surface scale lines are printed according to the angle compensation value. For example, for a ten-degree inclined panel, the sticker scale interval is pre-corrected according to the projection formula related to the sine triangle function, so that the scale value read by the construction personnel directly corresponds to the actual distance. This split design solves the problem of vernier scale interference when the concave and convex surfaces coexist at the net shell node, and avoids the aging risk of the silica gel layer of the self-adaptive profiling ruler 222 in extreme environments.

[0051] In actual operation, the construction personnel need to match the block type according to the site working condition. When installing the concave panel on the inside of the net shell, a thirteen-degree block is used. The four M3 screws on the back of the block are locked to the bottom surface of the vernier scale using a torque screwdriver, ensuring that the installation flatness error is less than zero point one millimeter. Then remove the release paper of the sticker, accurately paste along the top edge reference line of the block, and align the cross positioning mark at the edge of the sticker with the zero point of the vernier scale scale.

[0052] After the reference seat 1 pin 111 is inserted into the profile groove 101, the vernier scale is pushed to make the top surface of the block contact the target measurement point. For non-symmetrical panel groups with different inclination angles on both sides, the construction personnel need to install different angle blocks on the left and right sides of the tool.

[0053] This scheme shows significant advantages in complex working conditions. When the panel height and angle at the net shell node are different, the construction personnel can independently adjust the height of the left and right vernier scales and match the corresponding blocks. The measured data shows that in the extreme working condition where the panel inclination difference reaches five degrees and the height difference reaches seven millimeters, the installation error of this scheme is still controlled within plus or minus zero point five millimeters. When maintaining, only the worn sticker or locally deformed block needs to be replaced, and the comprehensive operation and maintenance cost is reduced by 60% compared with the self-adaptive profiling ruler 222.

[0054] Embodiment 3 As Figure 7 , 8As shown, the embodiment integrates an optical detection system on the basis of mechanical positioning in Example 1, and the overall structure is composed of a reference seat 1 fixed to the profile groove 101, a vertical column 21, and a laser projection module 3. The pin 111 at the bottom of the reference seat 1 is matched with the profile groove 101 to maintain a small gap within one millimeter, forming a non-movable measurement reference. The vertical column 21 is rigidly connected to the top of the reference seat 1 by bolts, and the laser projection module 3 integrated at the top of the vertical column 21 includes a red laser emitting unit 31 and a blue laser emitting unit 32 arranged side by side. The parallelism of the optical axes of the two emitting units is controlled within zero point one degree, and a diffraction grating plate 33 is fixed five millimeters in front. The surface of the plate is etched with a parallel groove array of two hundred lines per millimeter, and the groove depth is one quarter of the wavelength of light.

[0055] The diffraction grating plate 33 decomposes the red laser into a red parallel stripe group 34 with constant spacing, and the blue laser into a blue parallel stripe group 35 with the same spacing. Due to the wavelength difference between the red laser wavelength of six hundred and thirty nanometers and the blue laser wavelength of four hundred and fifty nanometers, the two stripe groups form an overlapping projection area 36 at a preset position three hundred millimeters away from the vertical column 21, which is located at the theoretical installation position of the edge of the magnetic shielding panel 200. The red and blue stripes in the overlapping area interfere to form a moire fringe pattern, and the fringe spacing is determined by the double wavelength difference and the projection geometry.

[0056] The cantilever bracket 37 extended from the side wall of the column 21 is installed with a photodetector 38 at the end, and the optical axis of the detector lens is strictly perpendicular to the installation plane of the magnetic shielding panel 200, and the center of the lens is at the same height as the center of the overlapping projection area 36. The double photosensitive element array inside the detector corresponds to the red and blue spectral response peaks respectively: the red channel sensitivity peak is six hundred and thirty nanometers, and the blue channel is four hundred and fifty nanometers. When the construction personnel moves the magnetic shielding panel 200 horizontally, the edge of the panel cuts the moire fringe in the overlapping projection area 36. If the edge deviates from the theoretical position by one millimeter, the red and blue stripes will produce relative displacement, resulting in imbalance of the light intensity of the two channels.

[0057] The differential amplification circuit of the photodetector 38 monitors the change of light intensity ratio in real time. When the edge of the panel is at the theoretical position, the red and blue stripes are completely overlapped, and the output voltage is balanced; when the edge deviates, the differential voltage exceeds the threshold value to trigger an audible alarm. The band-pass filter with a center frequency of one hundred hertz is built-in the signal processing circuit to suppress environmental light interference. The rectangular hollow steel beam structure of the cantilever bracket 37 ensures that the displacement of the detector in the vibration environment is less than five microns.

[0058] The dual-wavelength selection of the laser projection module 3 is based on the optimization of the permalloy reflection characteristics: 65% red laser reflectivity and 42% blue laser reflectivity, which enhances the contrast of the fringes. The groove direction of the diffraction grating plate 33 is parallel to the extension direction of the panel edge, so that the fringes are perpendicular to the displacement detection direction. The photodetector 38 is loaded with a narrowband filter (red passband 625-635 nm, blue passband 445-455 nm), which maintains a signal-to-noise ratio greater than 20 decibels in an environment of 100,000 lux of ambient light.

[0059] The spacing measurement member 22 on both sides of the column 21 serves as an auxiliary positioning device, and the measurement end thereof extends to the upper surface of the magnetic shielding panel 200. When the worker adjusts the position of the panel horizontally, the distance between the edge and the tool base can be directly read by observing the scale of the measurement member. For example, if the panel edge contacts the 20 mm scale line of the measurement member, it indicates that the current distance is 20 mm. The optical system works in cooperation with the mechanical measurement member: the mechanical measurement member provides a coarse adjustment reference, and the optical system realizes accurate positioning to the level of 0.1 mm.

[0060] In addition, for curved panel detection, the Moire fringes of the overlapping projection area 36 change in curvature at the curved edge. By comparing the curvature radius of the fringes with the designed curvature through a preset algorithm, the displacement reading is automatically corrected. For example, for the arc-shaped edge offset, the change rate of the curvature of the fringes and the offset amount are in a linear relationship.

[0061] In this embodiment, the optical coordinate system established by the fixed tool constitutes an absolute space reference. The laser projection module 3 generates red and blue interference fringes through the diffraction grating plate 33, and forms an overlapping projection area 36 at a distance of 300 mm from the column 21. This area serves as the theoretical installation position of the edge of the magnetic shielding panel 200. When the tool reference seat 1 is fixed to the profile tongue 101 through a small gap fit, the spatial coordinates of the projection area are locked and are not affected by construction disturbances. Its technical effect is to eliminate the reference drift of traditional mobile measurement tools and maintain the stability of the coordinate origin in large facility construction. The actual reference drift is less than 5 microns.

[0062] The spacing measurement member 22 provides a relative distance reference. The measurement end of the column 21 on both sides can independently slide to the surface of the magnetic shielding panel 200, and the scale line thereof directly indicates the millimeter-level distance between the panel edge and the tool base. When the worker moves the panel horizontally, the change in the scale value of the measurement member can be observed to obtain the actual distance. For example, if the panel edge contacts the 20 mm scale line, it indicates that the current distance is 20 mm, which is more intuitive than the optical system in reflecting the coarse adjustment position. This mechanical measurement serves as a redundant backup for the optical system and can still maintain the basic positioning function in strong light interference conditions.

[0063] The real-time feedback mechanism driven by the photodetector 38 realizes closed-loop control. When the panel edge cuts the Moiré fringe within the overlapping projection area 36, the relative displacement amount of red and blue fringes is captured by the dual photosensitive element array, and the displacement signal is converted into voltage change by the differential amplifier circuit. If the offset exceeds the zero point one millimeter threshold, the signal processing circuit drives the acousto-optic alarm to issue a prompt. Its working principle is that: voltage imbalance triggers a three-level alarm - single frequency beep when offset is one millimeter, double frequency beep plus yellow light flicker when offset is two millimeters, and red light constant plus continuous alarm when offset is three millimeters or more. This hierarchical prompt enables construction personnel to quickly determine the adjustment direction, and the actual measurement reduces the adjustment failure rate by more than 80%.

[0064] The synergistic effect of the three technical features forms a complete positioning system: the spatial reference established by the fixed tooling ensures the constancy of the coordinate system, the mechanical measuring element provides real-time distance reference, and the optical feedback system realizes precise positioning. In large industrial facility applications, this embodiment solves three major pain points: first, the small gap fit of the pin 111 eliminates reference drift, allowing cumulative installation error to be controlled within plus or minus zero point eight millimeters; second, non-contact optical detection avoids scratching the permalloy plating layer, extending the service life of the magnetic shielding panel 200; third, the acousto-optic prompt system compresses the single panel adjustment time from 5-10 minutes to within one hundred and fifty seconds, significantly improving construction efficiency.

[0065] In actual operation, the construction personnel first align the pin 111 at the bottom of the reference seat 1 with the profile groove 101, apply vertical pressure to form a small gap fit between the pin 111 and the inner wall of the groove 101, at which point the reference seat 1 is firmly locked in the measurement position. Then insert the vertical column 21 into the top slot of the reference seat 1, and tighten the bolts to complete the rigid connection. Turn on the power of the laser projection module 3 at the top of the column 21, and the red and blue laser beams are decomposed into parallel fringe groups by the diffraction grating plate 33, forming a red and blue alternating overlapping projection area 36 three hundred millimeters away from the column 21. This area is the theoretical installation position of the edge of the magnetic shielding panel 200.

[0066] When moving the magnetic shielding panel 200, the construction personnel push the panel horizontally along the width direction, causing the panel edge to gradually approach the overlapping projection area 36. At this time, coarse positioning can be performed by the spacing measuring element 22 on both sides of the column 21: slide the measuring element to make the end contact the panel surface, and observe the real-time distance value indicated by the scale mark. For example, when the panel edge contacts the twenty millimeter scale line of the measuring element, it indicates that the current edge is twenty millimeters away from the tooling base. During the coarse adjustment stage, keep the panel edge moving within the projection area, and observe the status of the photodetector 38 prompt device.

[0067] Fine adjustment phase relies on optical feedback system: when the panel edge cuts the moire fringe, photodetector 38 monitors the red-to-blue light intensity ratio in real time. If the edge deviates from the theoretical position by more than 1 mm, the differential amplification circuit output voltage is unbalanced, triggering the acousto-optic alarm to emit a single-frequency beep. The construction personnel fine-tune the panel position according to the alarm direction: rapid beep indicates left adjustment, and slow beep indicates right adjustment. When the deviation reaches 2 mm, the alarm is upgraded to a double-frequency beep accompanied by yellow light flashing; and when the deviation exceeds 3 mm, the alarm is upgraded to a constant red light and continuous alarm. This grading prompt allows the construction personnel to complete accurate positioning without understanding the optical principles.

[0068] Environmental adaptability operations include: under strong environmental light conditions, the narrow-band filter loaded by photodetector 38 automatically suppresses interference signals; when the day-night temperature difference changes, the heat-sensitive expansion layer of the reference seat 1 compensates for metal deformation through paraffin phase change; when encountering different width profiles 100, the rotary adjustment screw expands the width of the reference seat 1 to ensure constant projection distance. When installing a curved panel, the construction personnel correct the readings according to the preset curvature compensation algorithm - for example, when detecting an arc edge with a radius of 3 meters, the system automatically converts the fringe curvature into displacement.

[0069] When disassembling the tooling, first turn off the laser power, loosen the bolts 15 to separate the column 21 from the reference seat 1, and finally lift the reference seat 1 to disengage the prongs 111 from the profile tongue 101. The laser projection module and the photodetector 38 are separated through the quick-release interface for easy maintenance or replacement.

[0070] In addition, it is worth noting that when the engineering requirements change the preset standard distance between the magnetic shielding panel 200 edge and the column 21, the laser projection system achieves rapid adaptation through mechanical and electrical cooperative adjustment. The construction personnel first operate the diffraction grating plate 33 adjustment mechanism of the laser projection module 3, which is installed on a precision slide rail with axial scale. If the design distance needs to be adjusted from 300 mm to 400 mm, move the grating plate backward along the slide rail to the corresponding scale position, and then lock the fixing screw. This displacement changes the incident angle of the laser beam on the grating plate, causing the overlapping projection area 36 to shift to 400 mm, maintaining the fringe imaging quality unaffected by distance changes. The position of the photodetector 38 is adjusted synchronously. The quick-release interface at the end of the cantilever bracket 37 is designed with a dovetail slot slider, which can slide the detector along the bracket guide after unlocking. The operator uses a laser range finder to confirm that the center of the detector lens and the center of the new projection area are at the same height, then locks the slider and uses a level to calibrate the verticality of the optical axis. This step ensures that the detection field of view accurately covers the displacement detection area, avoiding parallax errors introduced by distance changes.

[0071] The distance correction knob of the signal processing circuit realizes threshold re-calibration. The knob is connected with an internal precision potentiometer, and the rotation angle of the knob is linearly related to the distance change. For example, when the distance increases by one hundred millimeters, the knob is rotated clockwise by about thirty degrees, and the change of the resistance value of the potentiometer reduces the differential voltage alarm threshold by twenty percent, compensating for the attenuation of the stripe displacement sensitivity caused by the increase of the projection distance. After adjustment, double verification is required: the sound-light alarm should be released when the standard distance block is placed at the new theoretical position; the single-frequency beep should respond normally when the zero-point-one-millimeter standard gauge triggers the offset.

[0072] For example, in a certain project construction, the installation distance of the magnetic shielding panel 200 is uniformly adjusted to three hundred and fifty millimeters. The construction team performs three-step adjustment on each piece of tooling: the grating plate is moved backward by fifty millimeters to the three hundred and fifty millimeter scale position, the detector is simultaneously moved outward by fifty millimeters, and the distance correction knob is uniformly rotated by fifteen degrees. The measured data shows that after adjustment, the positioning error of the projection area is not more than zero point three millimeters, the alarm threshold drift is less than five percent, and the single-board adjustment time remains about one hundred and ten seconds. The entire adjustment process takes an average of three minutes per unit, without the need to replace optical elements or professional instrument calibration.

[0073] The core technology of this adaptive design is to convert the distance parameter change into mechanical displacement. The slide rail displacement ΔS of the diffraction grating plate 33 and the projection distance increment ΔL satisfy ΔS equal to the product of ΔL and the tangent function of the diffraction angle θ of the grating, which ensures accurate migration of the projection area through the trigonometric relationship. The detector displacement is equal to the projection distance increment, maintaining the coincidence of the field center. The circuit threshold adjustment is based on the inverse relationship between the stripe displacement sensitivity and the distance, realizing the matching of electrical parameters with the change of optical characteristics. This modular adjustment mechanism enables the same set of tooling to adapt to different engineering standards, significantly reducing the cost of equipment modification.

Claims

1. A measuring positioning tool for magnetic shielding panels, comprising a tool base mounted on an interpanel profile, characterized in that: The tool base includes a reference seat and a measurement assembly detachably connected above the reference seat; the bottom of the reference seat is provided with a plug-in part, which cooperates with the groove of the profile to form a measurement reference; the measurement assembly includes a vertical column and a spacing measurement member symmetrically arranged on both sides of the column; the spacing measurement member can slide along the height direction of the column, and the measurement end extends to the upper surface of the magnetic shielding panel.

2. The measurement positioning fixture of claim 1, wherein: The column is fixedly connected with the reference seat through a connecting piece; the plug-in part has a downward extending plug; the cross-sectional profile of the plug matches the inner wall profile of the profile groove; the plug cooperates with the groove gap.

3. The measurement positioning fixture of claim 1, wherein: The spacing measurement members on both sides of the column can be independently adjusted; the spacing measurement member includes a measurement head assembly matching the angle of the magnetic shielding panel.

4. The measurement positioning fixture of claim 3, wherein: The measurement head assembly includes an adaptive profiling ruler, which can abut the angle of the magnetic shielding panel and adjust the extension direction of the bottom measurement scale.

5. The measurement positioning fixture of claim 1, wherein: The top of the column is integrated with a laser projection module; the laser projection module includes: Red and blue laser emission units arranged side by side; A diffraction grating plate fixed in front of the emission unit; The diffraction grating plate is configured to generate a red parallel stripe group and a blue parallel stripe group with the same spacing, and to form an overlapping projection area at the edge of the magnetic shielding panel at the preset position.

6. The measurement positioning fixture of claim 5, wherein: The side wall of the column is provided with a cantilever bracket; the cantilever bracket is mounted with a photoelectric detector at the end, the optical axis of the photoelectric detector is perpendicular to the installation plane of the magnetic shielding panel, and the lens center of the photoelectric detector is at the same height as the center of the overlapping projection area; the output end of the photoelectric detector is connected with a prompt device through a signal processing circuit.

7. The measurement positioning fixture of claim 1, wherein: The measurement end of the spacing measurement member is provided with a contact detection member; the contact detection member is embedded with a pressure sensing unit; the contact surface of the pressure sensing unit can match the upper surface of the magnetic shielding panel.

8. The measurement positioning fixture of claim 7, wherein: The contact detection member includes a color developing groove arranged around the length direction of the spacing measurement member; the color developing groove is embedded with a color developing tape; the color developing tape includes a plurality of LED units arranged along the length direction; each LED unit is connected with a partitioned output end of the pressure sensing unit through an independent lead wire; the partitioned output end of the pressure sensing unit corresponds to the position of the LED unit one by one.

9. The measurement positioning fixture of claim 2, wherein: The reference seat includes a first base and a second base that can slide relative to each other; an adjusting screw is arranged along the width direction between the first base and the second base; a lock piece is arranged on the first base and the second base; a heat-sensitive expansion layer is detachably arranged on the side wall of the reference seat on either side along the width direction.

10. The measurement positioning fixture of any one of claims 1-9, wherein: The bottom of the reference seat is provided with a mounting hole, a fastening bolt is mounted in the mounting hole from bottom to top, the fastening bolt includes a screw part connected to the mounting hole and a limiting head placed below the reference seat, the limiting head includes at least two limiting parts, the limiting parts extend outward along the radial direction of the limiting head, and the limiting parts can be connected with the groove hooks of the profile.

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