CN217384127U - Hob calibration equipment - Google Patents

Abstract

The application discloses hobbing cutter calibration equipment includes: the support comprises a first support for supporting the hob to be calibrated and a second support connected with the first support, the second support comprises two side plates which are oppositely arranged along a first direction and a back plate which is arranged between the two side plates, the back plate is movably connected with the side plates, and the back plate is movably arranged along a second direction relative to the side plates; the calibration platform is arranged on the support and comprises a sensor assembly used for calibrating the hob, the sensor assembly is connected to the back plate, and the sensor assembly is movably arranged relative to the back plate along a first direction. By adopting the hob calibration equipment provided by the application, the problem that hobs of various types and sizes cannot be conveniently calibrated in real time in the existing hob calibration equipment is at least solved.

Description

Hob calibration equipment

Technical Field

The application belongs to the technical field of equipment detection in the industry of full-face hard rock tunnel boring machines, and particularly relates to a calibration device applicable to a field hob.

Background

A Tunnel Boring Machine (TBM) is a large construction equipment for Tunnel construction. The disc cutter is used as a tool for crushing rocks of the tunnel boring machine and is a consumable product with the largest use amount in the use process of the tunnel boring machine. When the cutter is worn to a certain degree, the cutter needs to be replaced immediately, or the abrasion of other cutters is aggravated, and a vicious circle is formed.

The principle of hob abrasion loss detection is based on the fact that magnetic sensors convert magnetic line density changes caused by hob abrasion into voltage signals, and the abrasion loss values are obtained through calculation through processing of the voltage signals by a single chip microcomputer and an upper computer. Therefore, knowing the voltage value reflected by the sensor for each millimeter of wear of the hob in advance is a key step for measuring the wear.

However, in the hob calibration equipment in the prior art, the relative position relationship between the hob and the sensor is fixed, so that calibration can be performed only for hobs of a certain size. In a construction site, various hob types exist, so that the hob calibration equipment in the prior art cannot conveniently calibrate hobs of various types and sizes in real time.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hobbing cutter calibration equipment that application scope is wide, is convenient for carry out the demarcation to the hobbing cutter of different sizes and model on the scene.

In one aspect, an embodiment of the present application provides a hob calibration apparatus, including:

the support comprises a first support for supporting the hob to be calibrated and a second support connected with the first support, the second support comprises two side plates which are oppositely arranged along a first direction and a back plate which is arranged between the two side plates, the back plate is movably connected with the side plates, and the back plate is movably arranged along a second direction relative to the side plates;

the calibration platform is arranged on the support and comprises a sensor assembly used for calibrating the hob, the sensor assembly is connected to the back plate, and the sensor assembly is movably arranged relative to the back plate along the first direction.

According to an aspect of the embodiment of the application, the side plates are provided with first strip-shaped holes formed by extending along the second direction, and two ends of the back plate in the first direction are respectively connected to the first strip-shaped holes of the two side plates.

According to an aspect of the embodiment of the application, the calibration platform comprises a base movably connected with the back plate and a position adjusting component arranged on the base, the base is movably arranged relative to the back plate along a first direction, the sensor component is arranged on the position adjusting component, and under the driving of the position adjusting component, the sensor component is movably arranged relative to the base along a third direction.

According to an aspect of the embodiment of the present application, the back plate includes a second bar-shaped hole extending along the first direction, and the base is disposed on the back plate through the second bar-shaped hole.

According to an aspect of the embodiments of the present application, the base includes a base plate, a top plate and a bottom plate located at two ends of the base plate in the third direction and connected to the base plate, the base plate is movably connected to the back plate, the base plate is movably disposed relative to the back plate along the first direction, and the position adjusting assembly is disposed on the top plate and the bottom plate.

According to one aspect of the embodiment of the application, the position adjusting assembly comprises a screw rod connected to the top plate and the bottom plate, a controller arranged on one side of the top plate and/or the bottom plate, which is far away from the screw rod, and connected to the screw rod, and a movable block positioned between the top plate and the bottom plate and connected with the screw rod;

the movable block is movably arranged along the third direction under the driving of the screw rod, and the sensor assembly is arranged on the movable block.

According to an aspect of the embodiment of the present application, the position adjustment assembly further includes a grating ruler fixedly connected to the base, and the grating ruler is used for detecting a displacement amount of the movable block in the third direction.

According to an aspect of the embodiment of the application, the sensor assembly comprises a connecting plate and a plurality of sensors arranged on the connecting plate, the connecting plate comprises a first plate body and a second plate body which are intersected, and an included angle between the first plate body and the second plate body is 90-150 degrees in a plane defined by the second direction and the third direction.

According to an aspect of the embodiment of the application, the sensor comprises a wear loss sensor and a rotating speed sensor, the hob calibration equipment further comprises a speed measuring device, and the speed measuring device is used for being connected to a hub of the hob to be calibrated and is right opposite to the rotating speed sensor.

According to an aspect of the embodiment of the application, the first bracket comprises a supporting part for supporting the hob to be calibrated, and the shape of the supporting part is matched with the shape of the cutter shaft of the hob to be calibrated.

The hob calibration equipment provided by the embodiment of the application at least has the following beneficial effects:

according to the embodiment of the application, the hob and the calibration platform are respectively supported through the first support and the second support, in the second support, after the back plate is supported through the two side plates, the sensor assembly is connected to the back plate, the back plate moves in the second direction defined by the two side plates, the sensor assembly is limited to be movably arranged relative to the back plate along the first direction, namely the sensor assembly can be movably arranged between the two side plates along the first direction and the second direction, the hob calibration equipment can be fixed behind the hob, and the position of the sensor assembly is adjusted along the first direction and the second direction, so that the sensor is suitable for calibration of hobs of different sizes and types. Therefore, in the working site of the tunnel boring machine, the position of the sensor assembly can be adjusted according to the type, size, cutting edge shape and cutting edge thickness of the hob, so that the sensor assembly is arranged right opposite to the cutting edge of the hob, the aim of calibrating different hobs on the site is finally achieved, and the applicability and reliability of the hob calibrating equipment are improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic perspective view of an angle of a hob calibrating device provided in an embodiment of the present application;

FIG. 2 is a schematic perspective view of another angle of the hob calibrating apparatus provided in the embodiment of the present application;

fig. 3 is a schematic perspective structural diagram of a partial structure of a hob calibration device provided in an embodiment of the present application.

In the drawings: a hob calibration device 100;

a support 10; a first bracket 11; a first frame 111; a second frame 112; a second bracket 12; side plates 121; a first strip aperture 1211; a back plate 122; a second strip-shaped hole 1221;

a calibration platform 20; a sensor assembly 21; a connecting plate 211; the first plate 2111; the second plate 2112; a sensor 212; a wear amount sensor 2121; a rotational speed sensor 2122; a base 22; a substrate 221; a top plate 222; a bottom plate 223; a position adjusting assembly 23; a lead screw 231; a controller 232; a movable block 233; a grating scale 234;

a speed measuring device 30;

a first direction 1; a second direction 2; a third direction 3; the hob 200.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the embodiments of the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.

In the description of the present application, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of describing the embodiments of the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the embodiments of the present application, unless otherwise explicitly limited, terms such as setting, installing, connecting and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the terms in the present application in combination with the specific contents of the technical solutions.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The embodiments will be described in detail below with reference to the accompanying drawings.

The disc cutter is used as a rock crushing tool of the tunnel boring machine, and before the tunnel boring machine is used for construction of tunnel engineering construction, abrasion loss calibration needs to be carried out on each cutter, so that voltage values reflected by abrasion loss of each millimeter of different types of cutters on the sensor can be known in advance. However, since the shape and thickness of the cutting edge of each hob are different and the influence on the sensor in the same magnetic field is also different, it is necessary to be able to perform calibration on each hob in the field.

The prior art typically uses a moving sensor to the distance of the hob edge to simulate the wear process. However, in the hob calibration equipment in the prior art, the position of the sensor cannot be adjusted according to different tools, and the hob abrasion loss detection device cannot conveniently calibrate hobs of various types and sizes in real time on a construction site with various hob types.

Please refer to fig. 1 to fig. 3, wherein fig. 1 is a schematic perspective view of an angle of the hob calibrating apparatus provided in the embodiment of the present application; FIG. 2 is a schematic perspective view of another angle of the hob calibrating apparatus provided in the embodiment of the present application; fig. 3 is a schematic perspective structural diagram of a partial structure of a hob calibration device provided in an embodiment of the present application.

The embodiment of the present application provides a hobbing cutter calibration equipment 100, include: the support 10 comprises a first support 11 for mounting the hob 200 to be calibrated and a second support 12 connected with the first support 11, wherein the second support 12 comprises two side plates 121 arranged oppositely along a first direction 1 and a back plate 122 arranged between the two side plates 121, the back plate 122 is movably connected with the side plates 121, and the back plate 122 is movably arranged opposite to the side plates 121 along a second direction 2; the calibration platform 20 is disposed on the support 10, the calibration platform 20 includes a sensor assembly 21 for calibrating the hob 200, the sensor assembly 21 is connected to the back plate 122, and the sensor assembly 21 is movably disposed along the first direction 1 relative to the back plate 122.

In this way, the sensor assembly 21 is connected to the back plate 122, and the sensor assembly 21 is movably disposed along the first direction 1 relative to the back plate 122, and meanwhile, the back plate 122 is movably disposed along the second direction 2 relative to the side plate 121. After the hob 200 to be calibrated is mounted on the first support 11, errors between the cutting edges of the hob 200 to be calibrated and the sensor assembly 21 in the first direction 1 and the second direction 2 of different models and sizes can be adjusted by using the movement of the sensor assembly 21 relative to the back plate 122 in the first direction 1 and the movement of the back plate 122 in the second direction 2, and finally the cutting edges of the hob 200 to be calibrated and the sensor assembly 21 are opposite to each other, so that the calibration of the hob 200 on the construction site is realized.

In the embodiment of the present application, the hob calibration apparatus 100 includes a support 10, and the support 10 includes a first support 11 for mounting the hob 200 to be calibrated and a second support 12 connected to the first support 11.

The first bracket 11 may be a hob bracket, and the first bracket 11 may include a first bracket 111 for supporting the hob 200 to be calibrated and positioning the hob 200 to be calibrated, and a second bracket 112 for connecting the first bracket 111 and the second bracket 12.

When the hob 200 to be calibrated is installed in the first frame 111, it is necessary to maintain the stability of the hob 200 to be calibrated, that is, to prevent the hob 200 to be calibrated from generating position changes such as rotation and offset after being installed, so as to ensure the accuracy of calibration. For this purpose, the first support 11 may be provided with a support (not numbered) for supporting the hob 200 to be calibrated, the shape of the support being adapted to the shape of the arbor of the hob 200 to be calibrated. By the arrangement, the first support 11 is convenient for supporting the hob 200 to be calibrated, and the stability and reliability of the hob calibration equipment 100 are improved.

For example, when the cross section of the cutter shaft of the hob 200 to be calibrated is rectangular, the support part may be arranged to be rectangular.

Meanwhile, in order to avoid the contact between the cutting edge of the hob 200 and the ground or the hob calibration device 100 in the calibration process and the damage of the cutting edge and the hob calibration device 100 in the calibration process, the first frame body 111 can be arranged to comprise two plate bodies arranged at relative intervals, the two plate bodies are respectively provided with a supporting part, the two plate bodies are used for supporting the cutter shaft of the hob 200, the cutting edge of the hob is suspended, and the collision of the cutting edge is avoided.

The second frame 112 is a connecting member and is used to connect the first frame 111 and the second frame 12. Detachable connection modes such as screw connection, bolt connection and stud connection can be adopted between the second frame body 112 and the first frame body 111 and between the second frame body 112 and the second support 12. Meanwhile, the second frame body 112 and the first frame body 111, and the second frame body 112 and the second support 12 may be integrally formed, which are all within the protection scope of the present application.

In this embodiment, the cross section of the plane defined by the first frame 111 and the second frame 112 in the first direction and the third direction is a curved ruler, so as to facilitate the installation and the removal of the hob 200 to be calibrated.

In the embodiment of the present application, the second bracket 12 includes two side plates 121 disposed oppositely along the first direction 1, and a back plate 122 disposed between the two side plates 121.

The second support 12 is a calibration platform 20 support for mounting and supporting the calibration platform 20. The side plate 121 is used to connect with the second frame 112, and the back plate 122 is used to mount and support the calibration platform 20.

The first direction 1 may be an axial direction of a cutter shaft of the hob 200; or the direction may be perpendicular to the axis of the arbor of the hob 200 and parallel to any tangent of the cutting edge. I.e. the first direction 1 may be based on the left-right and front-back directions in fig. 2.

In the embodiment of the present application, the hob calibration apparatus 100 further includes a calibration platform 20, where the calibration platform 20 is disposed on the support 10.

The calibration platform 20 is an element for actually calibrating the hob 200. Specifically, the calibration platform 20 includes a sensor assembly 21 for calibrating the hob 200, the sensor assembly 21 is connected to the back plate 122, and the sensor assembly 21 is movably disposed along the first direction 1 relative to the back plate 122.

The sensor assembly 21 may be used to detect the wear amount of the cutting edge of the hob 200, and specifically, the wear degree of the cutting edge of the hob 200 may be determined by the characteristics of different voltage values reflected by the sensor assembly 21 when the wear degrees of the cutting edge are different.

The sensor assembly 21 and the back plate 122 can slide by arranging a sliding groove or a sliding rail. Under the condition that the sensor assembly 21 and the back plate 122 can slide by arranging a sliding chute and a sliding rail, the sensor assembly 21 and the back plate 122 can be positioned by arranging a spring buckle on the side surface of the sliding chute, that is, when the sensor assembly 21 moves to a proper position along the first direction 1, the sensor assembly 21 is positioned by the spring buckle.

In the present embodiment, the first direction 1 is the left-right direction in fig. 2, and the second direction 2 is the front-back direction in fig. 2.

Specifically, in the embodiments of the present application, the side plates 121 are provided with first strip-shaped holes 1211 formed extending along the second direction 2, and two ends of the back plate 122 in the first direction 1 are respectively connected to the first strip-shaped holes 1211 of the two side plates 121.

After the relative positions of the back plate 122 and the side plate 121 are adjusted, the back plate 122 can be positioned by positioning elements such as positioning pins, positioning mandrels or centering clamping devices, and the like, so that the positioning structure is convenient and firm, and is suitable for environments with much dust and mud on construction sites.

In some embodiments of the present application, the calibration platform 20 may further include a base 22 movably connected to the back plate 122 and a position adjustment assembly 23 disposed on the base 22. The base 22 is movably disposed along the first direction 1 relative to the back plate 122, the sensor assembly 21 is disposed on the position adjusting assembly 23, and the sensor assembly 21 is movably disposed along the third direction 3 relative to the base 22 under the driving of the position adjusting assembly 23.

Based on this, the sensor assembly 21 is arranged to be movable in the third direction 3 under the driving of the position adjusting assembly 23, so that the hob calibration equipment 100 can adjust the position of the sensor assembly 21 in the third direction 3, and the calibration accuracy and reliability are further ensured.

The third direction 3 is a direction perpendicular to the axis of the shaft of the hob 200 and perpendicular to a tangent line at any point of the cutting edge. That is, the third direction 3 is the up-down direction based on fig. 2.

In the embodiments of the present application, it may be further provided that the back plate 122 includes a second strip-shaped hole 1221 extending along the first direction 1, and the base 22 is disposed on the back plate 122 through the second strip-shaped hole 1221.

Similarly, through setting up second bar hole 1221, utilize second bar hole 1221 as the track that base 22 removed, after the position control of base 22 finishes, equally can utilize positioning element such as locating pin, positioning core axle or centering clamping device to fix a position, and is convenient and firm, with the environment looks adaptation of job site.

In some embodiments of the present application, it may be provided that the base 22 includes a base plate 221, a top plate 222 and a bottom plate 223 located at both ends of the base plate 221 in the third direction 3 and connected to the base plate 221. Wherein, the substrate 221 is movably connected to the back plate 122, the substrate 221 is movably disposed along the first direction 1 relative to the back plate 122, and the position adjustment assembly 23 is disposed on the top plate 222 and the bottom plate 223.

In some embodiments of the present application, the position adjustment assembly 23 may include a lead screw 231 connected to the top plate 222 and the bottom plate 223, a controller 232 connected to the lead screw 231 and disposed on a side of the top plate 222 and/or the bottom plate 223 facing away from the lead screw 231, and a movable block 233 located between the top plate 222 and the bottom plate 223 and connected to the lead screw 231. Wherein, the movable block 233 is movably disposed along the third direction 3 under the driving of the lead screw 231, and the sensor assembly 21 is disposed on the movable block 233.

In this embodiment, the controller 232 may be disposed on a side of the top plate 222 away from the bottom plate 223. Meanwhile, in order to increase the structural strength of the base 22, the base 221, the top plate 222, and the bottom plate 223 may be integrally formed.

In the embodiments of the present application, the controller 232 may directly use a manual rocker, and the controller 232 and the lead screw 231 are fixedly connected. Of course, in order to improve the reliability of the position adjusting assembly 23, in other embodiments of the present application, a detachable connection between the controller 232 and the lead screw may be provided, so as to facilitate replacement and maintenance of the lead screw 231 or the controller 232.

In some embodiments of the present application, the position adjustment assembly 23 further includes a linear scale 234 fixedly connected to the base 22, and the linear scale 234 is configured to detect a displacement amount of the movable block 233 in the third direction 3.

In some embodiments of the present application, the sensor assembly 21 includes a connecting plate 211 and a plurality of sensors 212 disposed on the connecting plate 211, the connecting plate 211 includes a first plate 2111 and a second plate 2112 intersecting with each other, and the first plate 2111 and the second plate 2112 are angled 90 ° to 150 ° in a plane defined by the second direction 2 and the third direction 3 to accommodate different types and sizes of hobs.

It should be noted that, in the embodiments of the present application, the first plate 2111 is detachably connected to the base 22, and the plurality of sensors 212 are disposed at an end of the second plate 2112 away from the first plate 2111. Meanwhile, the number of the connecting plates 211 can be set to be multiple, and the included angle degree between the first plate body 2111 and the second plate body 2112 in different connecting plates 211 is set to be different. Like this, when demarcating the hobbing cutter 200 of different model sizes, can be through changing different connecting plate 211 to guarantee that the sensing direction of sensor 212 is perpendicular with hobbing cutter 200 cutting edge tangential direction, further promote the test accuracy of sensor 212.

In some embodiments of the present application, the sensor 212 includes a wear sensor 2121 and a rotational speed sensor 2122, and the hob calibration apparatus 100 further includes a speed measuring device 30, where the speed measuring device 30 is configured to be connected to a hub of the hob 200 to be calibrated and directly face the rotational speed sensor 2122.

In the embodiments of the present application, after the hob 200 to be calibrated is mounted on the first support 11, and the position of the sensor assembly 21 in the third direction 3 is regulated and controlled by the movement of the base 22 in the first direction 1, the movement of the back plate 122 in the second direction 2, and the position regulating assembly 23, the speed measuring device 30 is placed on the hub of the hob 200 to be calibrated, so that the cutting edge of the hob 200 is disposed opposite to the wear sensor 2121, and the speed measuring device 30 is disposed opposite to the rotational speed sensor 2122. Meanwhile, in order to simulate the rotation of the hob 200 during operation, the speed measuring device 30 needs to move back and forth along the periphery of the hub of the hob 200 to be calibrated, and in the process, a calibrating person can judge whether the rotation speed sensor 2122 is available or not by observing the reaction of the rotation speed sensor 2122 and judge whether the sensitivity level of the rotation speed sensor 2122 reaches the standard or not.

For example, the speed measuring device 30 may be attached to the hub of the hob 200 to be calibrated in a mounting manner, so that the speed measuring device 30 can reciprocate relative to the hub of the hob 200 to be calibrated. Meanwhile, the installation and the movement of the speed measuring device 30 can be completed manually by a person or by an external machine, and both are within the protection scope of the application.

The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the embodiments of the present application, and these modifications or substitutions should be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A hobbing cutter calibration equipment which characterized in that includes:

the support comprises a first support for supporting the hob to be calibrated and a second support connected with the first support, the second support comprises two side plates which are oppositely arranged along a first direction and a back plate which is arranged between the two side plates, the back plate is movably connected with the side plates, and the back plate is movably arranged along a second direction relative to the side plates;

the calibration platform is arranged on the support and comprises a sensor assembly used for calibrating the hob, the sensor assembly is connected to the back plate, and the sensor assembly is movably arranged relative to the back plate along the first direction.

2. The hob calibration equipment according to claim 1, wherein the side plates are provided with first strip-shaped holes formed by extending along the second direction, and two ends of the back plate in the first direction are respectively connected to the first strip-shaped holes of the two side plates.

3. The hob calibration apparatus according to claim 1, wherein the calibration platform further includes a base movably connected to the back plate, and a position adjustment assembly disposed on the base, the base is movably disposed relative to the back plate along the first direction, the sensor assembly is disposed on the position adjustment assembly, and the sensor assembly is movably disposed relative to the base along a third direction under the driving of the position adjustment assembly.

4. The hob calibration apparatus of claim 3, wherein the back plate includes a second bar-shaped hole extending along the first direction, the base being disposed on the back plate through the second bar-shaped hole.

5. The hob calibration apparatus according to claim 3, wherein the base includes a base plate, a top plate and a bottom plate located at two ends of the base plate in the third direction and connected to the base plate, the base plate is movably connected to the back plate, the base plate is movably disposed relative to the back plate along the first direction, and the position adjustment assembly is disposed on the top plate and the bottom plate.

6. The hob calibration apparatus according to claim 5, wherein the position adjustment assembly includes a screw rod connected to the top plate and the bottom plate, a controller disposed on a side of the top plate and/or the bottom plate facing away from the screw rod and connected to the screw rod, and a movable block located between the top plate and the bottom plate and connected to the screw rod;

the movable block is under the drive of lead screw along the third direction is portable to be set up, sensor assembly set up in the movable block.

7. The hob calibration apparatus according to claim 6, wherein the position adjustment assembly further includes a grating ruler fixedly connected to the base, and the grating ruler is configured to detect a displacement amount of the movable block in the third direction.

8. The hob calibration apparatus of claim 3, wherein the sensor assembly includes a connecting plate and a plurality of sensors disposed on the connecting plate, the connecting plate includes a first plate and a second plate intersecting with each other, and an included angle between the first plate and the second plate is 90 ° to 150 ° in a plane defined by the second direction and the third direction.

9. The hob calibration equipment according to claim 6, wherein the sensor includes a wear sensor and a rotation speed sensor, and the hob calibration equipment further includes a speed measuring device, the speed measuring device is used for being connected to a hub of the hob to be calibrated and facing the rotation speed sensor.

10. The hob calibration apparatus according to claim 1, wherein the first bracket includes a support portion for supporting the hob to be calibrated, and the shape of the support portion is adapted to the shape of an arbor of the hob to be calibrated.

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