CN219161259U - Calibrating tool - Google Patents

Abstract

The utility model relates to the technical field of handling equipment, in particular to a calibration tool. The device comprises a clamping mechanism, an adjusting structure and a calibrating structure, wherein the clamping structure is detachably arranged on a coil stock supporting block; the adjusting structure comprises a position bearing, a positioning shaft and an adjusting assembly, wherein the first end of the positioning shaft penetrates through the adjusting assembly to be connected with the position bearing, and the adjusting assembly can adjust the position of the positioning shaft along the first direction and the second direction so that the position bearing is attached to the working surface of the coil stock supporting block; the calibration structure comprises a calibration plate and a marker, the calibration plate is fixedly connected with the second end of the positioning shaft, and the marker is arranged below the calibration plate. Through the position of adjustable sign of adjusting structure relative AGV dolly, can realize the accurate location of sign under the prerequisite of guaranteeing the laminating of the working face of position bearing and coil stock supporting shoe like this. The portable calibration device is simple in structure, convenient to carry, simple in calibration process, free of use in a specific environment and free of influence on production efficiency.

Description

Calibrating tool

Technical Field

The utility model relates to the technical field of handling equipment, in particular to a calibration tool.

Background

With the rapid development of logistics automation and production automation, the AGVs (Automated Guided Vehicle, automated guided vehicles) are also more widely used. The coil handling AGV is specially designed for coil handling and is mainly applied to lithium battery foil coil handling or optical film coil handling scenes; because the requirement of the butt joint precision is often higher (within +/-1 mm), but the parking precision of the AGV cannot meet the requirement, the terminal guiding device is required to be installed on the AGV, the marker is installed on the butt joint equipment, and after the AGV parks, the required butt joint precision is realized by correcting the relative position of the terminal guiding device and the marker. For example, a two-dimensional code camera is installed on an AGV, a two-dimensional code is installed on a docking device, and the relative position error is read and corrected by shooting the two-dimensional code; installing a photoelectric detector (PSD) on the AGV, installing a laser emitter on the docking equipment, irradiating laser on the PSD, and correcting the PSD after the PSD can give out relative position errors; and installing a 3D vision camera on the AGV, installing a special-shaped marker on the docking equipment, and correcting the position error read by the 3D camera.

In order to maintain the consistency of multiple AGVs, the relative positions of the end guide devices and the coil stock need to be calibrated no matter what type of end guide devices are used, so that the multiple AGVs can be successfully docked when the multiple AGVs are docked with multiple docking devices. The current mode of guaranteeing the relative position of the tail end guiding device and the coil stock mainly comprises two modes, namely, firstly, calibrating the tail end guiding device, and then, pinning when the tail end guiding device is installed, wherein the mode is based on the premise that the relative position of a pin hole and a bracket for bearing the coil stock is accurate enough, but on one hand, certain manufacturing errors exist in the position of the pin hole, on the other hand, the installation errors of the tail end guiding device also comprise angle errors, and the mode cannot eliminate the errors and cannot achieve ideal precision; the other is to use a docking device as a reference, dock each AGV with this docking device, mark the end guide device on each AGV at the same time, then dock with other docking devices with the AGV that marks, set up the position of the marker to guarantee the uniformity, this kind of mode can reach the required precision, but the shortcoming lies in that the process is too loaded down with trivial details, the implementation time is longer, and after changing the end guide, need with docking device recalibration, this needs to make docking device stop producing, has produced the influence to production efficiency.

Therefore, a calibration tool is needed to solve the above technical problems.

Disclosure of Invention

The utility model aims to provide a calibration tool which has the advantages of portability, accurate calibration, simple calibration process, no need of a specific environment and no influence on production efficiency.

To achieve the purpose, the utility model adopts the following technical scheme:

calibration frock, detachably sets up on coil stock supporting shoe for the calibration of AGV terminal guide device includes:

the clamping structure is detachably arranged on the coil stock supporting block;

the adjusting structure comprises a position bearing, a positioning shaft and an adjusting assembly, wherein the first end of the positioning shaft penetrates through the adjusting assembly to be connected with the position bearing, and the adjusting assembly can adjust the position of the positioning shaft along a first direction and a second direction so that the position bearing is attached to the working surface of the coil stock supporting block;

the calibration structure comprises a calibration plate and a marker, wherein the calibration plate is fixedly connected with the second end of the positioning shaft, the marker is arranged below the calibration plate, and the marker is used for calibrating whether the position of the AGV tail end guide device is offset or not;

the first direction is perpendicular to the second direction.

As a preferred technical scheme of above-mentioned demarcation frock, adjusting part includes base plate, first direction movable plate and second direction movable plate, the base plate with clamping structure can dismantle and be connected, the base plate with first direction movable plate is followed first direction sliding connection, first direction movable plate with second direction movable plate sliding connection, first direction movable plate can for the second direction movable plate is followed the second direction and is removed, the second direction movable plate with locating shaft fixed connection, be provided with rectangular hole on the first direction movable plate, the length direction in rectangular hole is followed the second direction extends, the locating shaft stretches out rectangular hole.

As a preferable technical scheme of the calibration tool, a first sliding rail and a first sliding block which are in sliding fit along a first direction are arranged between the base plate and the first direction moving plate, the first sliding rail is fixedly arranged on the side wall of the first direction moving plate, which faces the base plate, and the first sliding block is fixedly connected with the base plate.

As a preferable technical scheme of the calibration tool, a second sliding block and a second sliding rail which are in sliding fit along a second direction are arranged between the first direction moving plate and the second direction moving plate, the second sliding rail is fixedly arranged on the side wall of the second direction moving plate, which faces the first direction moving plate, and the second sliding block is fixedly connected with the first direction moving plate.

As an optimized technical scheme of the calibrating tool, the long strip holes are embedded with support bearings, and the support bearings are sleeved on the positioning shaft.

As an optimized technical scheme of the calibration tool, the adjusting assembly further comprises a supporting shaft, a first end of the supporting shaft is fixedly connected with the second direction moving plate, and a second end of the supporting shaft is fixedly connected with the calibration plate.

As an optimized technical scheme of the calibrating tool, the supporting shaft and the positioning shaft are fixedly connected with the calibrating plate through the pressing plate and the screws.

As a preferred technical scheme of the calibration tool, the clamping structure comprises a claw, a limit screw and a rotary locking handle, the rotary locking handle comprises a threaded column and a screwing part, a first end of the threaded column is fixedly connected with the screwing part, a second end of the threaded column penetrates through the base plate to be in threaded connection with the claw, and a first end of the limit screw penetrates through the claw to be in threaded connection with the base plate.

As an optimized technical scheme of the calibration tool, the clamping structure further comprises a spring, the spring is sleeved on the threaded column, the first end of the spring is abutted to the base plate, and the second end of the spring is abutted to the clamping jaw.

As a preferable technical scheme of the calibrating tool, the calibrating tool further comprises a handle, wherein the handle is fixedly arranged on the substrate.

The utility model has the beneficial effects that:

the calibrating tool comprises a clamping mechanism, an adjusting structure and a calibrating structure, wherein the clamping structure is detachably arranged on the coil stock supporting block, so that the clamping structure can adapt to the calibrating requirements of different AGV trolleys; the adjusting structure comprises a position bearing, a positioning shaft and an adjusting assembly, wherein the first end of the positioning shaft penetrates through the adjusting assembly to be connected with the position bearing, and the adjusting assembly can adjust the position of the positioning shaft along the first direction and the second direction so that the position bearing is attached to the working surface of the coil stock supporting block; the calibration structure comprises a calibration plate and a marker, the calibration plate is fixedly connected with the second end of the positioning shaft, the marker is arranged below the calibration plate, and the marker is used for calibrating whether the position of the AGV tail end guiding device deviates. The position bearing is used for positioning the calibration object, the position of the marker relative to the AGV trolley is adjustable through the adjusting structure, and the position bearing and the adjusting structure are matched with each other, so that the accurate positioning of the marker can be realized on the premise that the position bearing is attached to the working face of the coil stock supporting block. Compared with the prior art, the portable calibration device is simple in structure, convenient to carry, simple in calibration process, free of use in a specific environment and free of influence on production efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic diagram of a calibration fixture provided by an embodiment of the utility model mounted on an AGV;

fig. 2 is a schematic structural view of a coil stock supporting block according to an embodiment of the present utility model;

FIG. 3 is a schematic structural diagram of a first view angle of a calibration tool according to an embodiment of the present utility model;

FIG. 4 is a schematic structural diagram of a second view angle of the calibration tool according to the embodiment of the present utility model;

FIG. 5 is a top view of a calibration fixture provided by an embodiment of the present utility model;

FIG. 6 is a side view of a calibration fixture provided by an embodiment of the present utility model;

FIG. 7 is a cross-sectional view at A-A in FIG. 6;

fig. 8 is a cross-sectional view at B-B in fig. 6.

In the figure:

1. a clamping structure; 11. a claw; 12. a limit screw; 13. rotating the locking handle; 131. a threaded column; 132. a screwing part; 14. a spring; 2. an adjustment structure; 21. a position bearing; 22. positioning a shaft; 23. a substrate; 231. a third reference surface; 232. a fourth reference surface; 24. a first direction moving plate; 241. a slit hole; 25. a second direction moving plate; 26. a first slide rail; 27. a first slider; 28. a second slider; 29. a second slide rail; 210. a support bearing; 211. a support shaft; 3. calibrating a structure; 31. a calibration plate; 32. a marker; 4. a handle; 5. a fixed plate; 6. a pressing plate;

10. AGV trolley; 101. a coil stock supporting block; 1011. a working surface; 1012. a first reference surface; 1013. a second reference surface; 102. AGV end guide device.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1 and 2, a coil supporting block 101 is provided on an AGV car 10 in the prior art, and an AGV end guide device 102 is mounted on the coil supporting block 101; the coil stock supporting block 101 has a working face 1011 for supporting the coil stock; in addition, the coil stock supporting block 101 is provided with a first reference surface 1012 and a second reference surface 1013 perpendicular to each other.

The utility model provides a calibration tool which can be detachably arranged on a coil stock supporting block 101, and is used for calibrating an AGV end guide device 102 so as to ensure that an AGV trolley 10 can accurately reach a position. The calibration tool has the advantages of portability, accurate calibration, simple calibration process, no need of a specific environment and no influence on production efficiency.

As shown in fig. 3 and 4, the calibration fixture comprises a clamping mechanism, an adjusting structure 2 and a calibration structure 3, wherein the clamping structure 1, the clamping structure 1 is detachably arranged on a coil stock supporting block 101, so that the clamping structure 1 can adapt to the calibration requirements of different AGV trolleys 10; the adjusting structure 2 comprises a position bearing 21, a positioning shaft 22 and an adjusting component, wherein the first end of the positioning shaft 22 passes through the adjusting component to be connected with the position bearing 21, and the adjusting component can adjust the position of the positioning shaft 22 along the first direction and the second direction so as to enable the position bearing 21 to be attached to the working surface 1011 of the coil stock supporting block 101; the calibration structure 3 includes a calibration plate 31 and a marker 32, the calibration plate 31 is fixedly connected with the second end of the positioning shaft 22, the marker 32 is disposed below the calibration plate 31, and the marker 32 is used for calibrating whether the position of the AGV end guiding device 102 is offset. The position bearing 21 is used for accurate positioning of the markers 32. The position of the marker 32 relative to the AGV trolley 10 can be adjusted through the adjusting structure 2, so that the marker 32 can be accurately positioned on the premise of ensuring that the position bearing 21 is attached to the working surface 1011 of the coil stock supporting block 101. The portable calibration device is simple in structure, convenient to carry, simple in calibration process, free of use in a specific environment and free of influence on production efficiency.

The first direction is perpendicular to the second direction, and it is understood that one of the first direction and the second direction is a horizontal direction, and the other is a vertical direction.

It should be noted that, in this embodiment, the marker 32 is not specifically limited, and the specific structure of the marker 32 is matched with the AGV end guiding device 102, for example, if the AGV end guiding device 102 is a photo detector, the marker 32 is a laser emitter, and after the laser irradiates the photo detector, a relative position error can be given, and then correction is performed to ensure that the photo detector is at a correct position. Of course, in other embodiments the marker 32 may also be a two-dimensional code or bar code and the AGV end guide 102 may be a code scanner or a code scanner.

In some embodiments, the adjustment assembly comprises a base plate 23, a first direction plate 24 and a second direction plate 25, the base plate 23 being detachably connected to the clamping structure 1. The base plate 23 is slidably connected with the first direction moving plate 24, the base plate 23 can move along a first direction relative to the first direction moving plate 24, the first direction moving plate 24 is slidably connected with the second direction moving plate 25, the first direction moving plate 24 can move along a second direction relative to the second direction moving plate 25, and therefore the base plate 23 can move along the second direction along with the first direction moving plate 24, and the base plate 23 can move in the first direction and the second direction under the combined action of the first direction moving plate 24 and the second direction moving plate 25.

The second direction moving plate 25 is fixedly connected with the positioning shaft 22, the first direction moving plate 24 is provided with a long strip hole 241, the length direction of the long strip hole 241 extends along the second direction, the second direction is the horizontal direction, and the positioning shaft 22 extends out of the long strip hole 241. The elongated hole 241 is provided to ensure movement of the substrate 23 in the second direction. The arrangement of the adjusting component can ensure that the position bearing 21 is attached to the working surface 1011 of the coil stock supporting block 101, so that the substrate 23 can be accurately positioned.

As illustrated in fig. 6 to 8, a first slide rail 26 and a first slider 27 that are slidably engaged along the first direction are disposed between the base plate 23 and the first direction moving plate 24, the first slide rail 26 is fixedly disposed on a side wall of the base plate 23 facing the first direction moving plate 24, and the first slider 27 is fixedly connected to the base plate 23. A second sliding block 28 and a second sliding rail 29 which are in sliding fit along the second direction are arranged between the first direction moving plate 24 and the second direction moving plate 25, the second sliding rail 29 is fixedly arranged on the side wall of the first direction moving plate 24 facing the second direction moving plate 25, and the second sliding block 28 is fixedly connected with the first direction moving plate 24. The connection mode of the sliding rail and the sliding block can enable the whole structure of the adjusting assembly to be simple, the sliding rail and the sliding block structure of the sliding rail to be easy to obtain, and sliding connection among the base plate 23, the first direction moving plate 24 and the second direction moving plate 25 is easy to realize.

The elongated hole 241 is embedded with a support bearing 210, and the support bearing 210 is sleeved on the positioning shaft 22. The support bearing 210 can avoid the contact between the positioning shaft 22 and the hole wall of the elongated hole 241, so that the positioning shaft 22 can rotate more smoothly. The elongated hole 241 provides additional vertical supporting force while limiting the movement range of the supporting bearing 210, enhances rigidity, and ensures accuracy.

The substrate 23 has a third reference surface 231 and a fourth reference surface 232 perpendicular to each other, wherein the first reference surface 1012 can be bonded to the third reference surface 231, and the second reference surface 1013 can be bonded to the fourth reference surface 232.

Further, in some embodiments, with continued reference to fig. 7, the adjustment assembly further includes a support shaft 211, a first end of the support shaft 211 is fixedly connected to the second direction moving plate 25, and a second end of the support shaft 211 is fixedly connected to the calibration plate 31. The supporting shaft 211 can play a role in supporting the second direction moving plate 25, so that the positioning shaft 22 is prevented from being deformed under the action of gravity of the base plate 23, the first direction moving plate 24 and the second direction moving plate 25, the positioning accuracy of the marker 32 is further ensured, and the service life of the positioning shaft 22 can be prolonged.

The supporting shaft 211 and the positioning shaft 22 are fixedly connected with the calibration plate 31 through the pressing plate 6 and screws. The clamp plate 6 can realize spacing to the head of screw, and then receives the extrusion of screw, prevents that the screw from extrudeing calibration board 31 and causing calibration board 31 to warp.

The support shaft 211 and the positioning shaft 22 are respectively provided with a fixed disc 5, and the fixed disc 5 is fixedly connected with the second direction moving plate 25 through screws, so that the purpose of fixedly connecting the support shaft 211 and the positioning shaft 22 with the second direction moving plate 25 is achieved.

In some embodiments, as shown in fig. 8, through holes and threaded holes are formed in the base plate 23 and the claw 11, the clamping structure 1 includes the claw 11, a limit screw 12 and a rotation locking handle 13, the rotation locking handle 13 includes a threaded column 131 and a screwing part 132, a first end of the threaded column 131 is fixedly connected with the screwing part 132, a second end of the threaded column 131 passes through the through hole of the base plate 23 and then enters into the threaded hole of the claw 11 to be in threaded connection with the claw 11, and a first end of the limit screw 12 passes through the through hole of the claw 11 and then enters into the threaded hole of the base plate 23 to be in threaded connection with the base plate 23. The position of the clamping jaw 11 is adjusted by rotating the locking handle 13 and the limit screw 12, so that the clamping jaw 11 can loosen or clamp the coil stock supporting block 101.

In order to prevent the claws 11 from scratching the coil stock supporting block 101, chamfers are arranged at the corners of the claws 11.

In some embodiments, the clamping structure 1 further includes a spring 14, the spring 14 is sleeved on the threaded post 131, a first end of the spring 14 abuts against the base plate 23, and a second end of the spring 14 abuts against the claw 11. The spring 14 is always in a compressed state, and after the claw 11 releases the coil stock supporting block 10, the spring 14 can push the claw 11, so that the claw 11 is opened, and the coil stock supporting block 10 is conveniently located between the claw 11 and the base plate 23 in the next use.

In some embodiments, to facilitate the overall handling of the calibration fixture, the calibration fixture further includes a handle 4, where the handle 4 is fixedly disposed on the base plate 23. The handle 4 can be conveniently held by hand, so that operators can carry the whole calibration tool conveniently.

Referring to fig. 1 and 5, the installation process of the calibration fixture on the coil stock supporting block 101 is as follows:

when the calibration is carried out, the lifting handle 4 is rotated, the clamping jaw 11 is loosened, the lifting handle 4 places the calibration fixture on the coil stock supporting block 101, the coil stock supporting block 101 is positioned between the clamping jaw 11 and the substrate 23, the third reference surface 231 is attached to the first reference surface 1012, the rotary locking handle 13 is screwed, the clamping jaw 11 clamps the coil stock supporting block 101, and the second reference surface 1013 is attached to the fourth reference surface 232; the calibration plate 31 is moved to make the position bearing 21 and the working surface 1011 be attached; the marker 32 and the coil stock supporting block 101 have accurate relative positions (theoretical positions) at the moment; the position values of the X and Y values can be read by the AGV end guide 102, and calibration can be completed by adjusting the position of the AGV end guide 102 or modifying the position by software to zero the X and Y values.

Furthermore, the foregoing description of the preferred embodiments and the principles of the utility model is provided herein. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. Calibration frock, detachably sets up on coil stock supporting shoe (101) for the demarcation of AGV terminal guide device (102), its characterized in that includes:

the clamping structure (1) is detachably arranged on the coil stock supporting block (101);

the adjusting structure (2) comprises a position bearing (21), a positioning shaft (22) and an adjusting assembly, wherein the first end of the positioning shaft (22) penetrates through the adjusting assembly to be connected with the position bearing (21), and the adjusting assembly can adjust the position of the positioning shaft (22) along a first direction and a second direction so that the position bearing (21) is attached to a working surface (1011) of the coil stock supporting block (101);

the calibration structure (3) comprises a calibration plate (31) and a marker (32), wherein the calibration plate (31) is fixedly connected with the second end of the positioning shaft (22), the marker (32) is arranged below the calibration plate (31), and the marker (32) is used for calibrating whether the position of the AGV tail end guide device (102) is offset or not;

the first direction is perpendicular to the second direction.

2. The calibration fixture according to claim 1, wherein the adjusting assembly comprises a base plate (23), a first direction moving plate (24) and a second direction moving plate (25), the base plate (23) is detachably connected with the clamping structure (1), the base plate (23) is slidably connected with the first direction moving plate (24) along a first direction, the first direction moving plate (24) is slidably connected with the second direction moving plate (25), the first direction moving plate (24) can move relative to the second direction moving plate (25) along a second direction, the second direction moving plate (25) is fixedly connected with the positioning shaft (22), a long hole (241) is formed in the first direction moving plate (24), the length direction of the long hole (241) extends along the second direction, and the positioning shaft (22) extends out of the long hole (241).

3. The calibration fixture according to claim 2, characterized in that a first sliding rail (26) and a first sliding block (27) which are in sliding fit along a first direction are arranged between the base plate (23) and the first direction moving plate (24), the first sliding rail (26) is fixedly arranged on the side wall of the first direction moving plate (24) facing the base plate (23), and the first sliding block (27) is fixedly connected with the base plate (23).

4. The calibration fixture according to claim 2, characterized in that a second sliding block (28) and a second sliding rail (29) which are in sliding fit along a second direction are arranged between the first direction moving plate (24) and the second direction moving plate (25), the second sliding rail (29) is fixedly arranged on the side wall of the second direction moving plate (25) facing the first direction moving plate (24), and the second sliding block (28) is fixedly connected with the first direction moving plate (24).

5. The calibration fixture according to claim 2, wherein the elongated hole (241) is embedded with a support bearing (210), and the support bearing (210) is sleeved on the positioning shaft (22).

6. The calibration fixture according to claim 2, wherein the adjusting assembly further comprises a support shaft (211), a first end of the support shaft (211) is fixedly connected with the second direction moving plate (25), and a second end of the support shaft (211) is fixedly connected with the calibration plate (31).

7. The calibration fixture according to claim 6, characterized in that the support shaft (211) and the positioning shaft (22) are fixedly connected with the calibration plate (31) through a pressing plate (6) and screws.

8. Calibration fixture according to claim 2, characterized in that the clamping structure (1) comprises a claw (11), a limit screw (12) and a rotation locking handle (13), the rotation locking handle (13) comprises a threaded column (131) and a screwing part (132), a first end of the threaded column (131) is fixedly connected with the screwing part (132), a second end of the threaded column (131) penetrates through the base plate (23) to be in threaded connection with the claw (11), and a first end of the limit screw (12) penetrates through the claw (11) to be in threaded connection with the base plate (23).

9. The calibration fixture according to claim 8, wherein the clamping structure (1) further comprises a spring (14), the spring (14) is sleeved on the threaded column (131), a first end of the spring (14) is abutted to the base plate (23), and a second end of the spring (14) is abutted to the claw (11).

10. Calibration fixture according to any one of claims 2-9, further comprising a handle (4), said handle (4) being fixedly arranged on said base plate (23).

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