CN214951044U - Diameter measuring device for slewing bearing - Google Patents

Abstract

The utility model provides a slewing bearing diameter measurement device belongs to industrial measurement technical field, include: the first end of the measuring rod is provided with a butting part; the vertical rod is rotatably arranged at the second end of the measuring rod; the measuring structures are arranged on the vertical rods and are provided with a plurality of measuring structures; and the locking mechanism is arranged between the measuring rod and the vertical rod and is suitable for fixing the relative position between the measuring rod and the vertical rod. The utility model provides a pair of slewing bearing diameter measuring device, when needing to measure different diameters, only need to rotate the pole setting so that different measurement structure cooperatees with butt portion respectively to use locking mechanical system to fix, can switch measuring device, consequently utilize the device can measure the diameter of unidimensional not, can be with diameter or the raceway diameter that is used for measuring the slewing bearing's of different models inner circle and outer lane, measurement of efficiency is high.

Description

Diameter measuring device for slewing bearing

Technical Field

The utility model relates to an industrial measurement technical field, concretely relates to slewing bearing diameter measurement device.

Background

The slewing bearing is composed of an inner ring, an outer ring, a rolling body and the like, is a large bearing capable of bearing comprehensive loads, and can simultaneously bear larger axial and radial loads and overturning moments. The slewing bearing is widely applied in the actual industry, is called as a joint of a machine, and is an important transmission part which is necessary for a machine which needs to do relative slewing motion between two objects and simultaneously needs to bear axial force, radial force and overturning moment. With the rapid development of the mechanical industry, the slewing bearing is widely applied to the industries of ship equipment, engineering machinery, light industry machinery, metallurgical machinery, medical machinery, industrial machinery and the like.

The slewing bearing has higher requirements on the central diameters of the inner ring and the outer ring, and the processing difficulty is higher. After the processing is finished, the detection of the central diameters of the inner ring and the outer ring of the slewing bearing raceway also becomes a difficult problem. Currently, many bearing factories use portable length measuring devices for measurement, and each slewing bearing with different specifications is equipped with one length measuring device. However, because the slewing bearing with various specifications exists in the processing field, after the diameter of one slewing bearing is measured, another length measuring device needs to be replaced, and the length measuring device belongs to a precision measuring tool and cannot be randomly placed, so that the measuring device needs to go to a placing place to take another measuring device, and the measuring efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model is to overcome the defect that slewing bearing inner circle and outer lane diameter or raceway diameter measurement inefficiency among the prior art.

In order to solve the technical problem, the utility model provides a slewing bearing diameter measuring device, include:

the first end of the measuring rod is provided with a butting part;

the vertical rod is rotatably arranged at the second end of the measuring rod;

the measuring structures are arranged on the vertical rods and are provided with a plurality of measuring structures;

and the locking mechanism is arranged between the measuring rod and the vertical rod and is used for fixing the relative position between the measuring rod and the vertical rod.

The locking mechanism includes:

the clamping groove is arranged on the measuring rod;

the clamping block is movably arranged on the vertical rod and is provided with a locking position embedded into the clamping groove and an unlocking position separated from the clamping groove;

and the driving structure is arranged on the vertical rod and used for driving the clamping block to move between a locking position and an unlocking position.

The upper surface of pole setting is provided with and holds the concave part, be provided with the mounting hole on holding the diapire of concave part, drive structure is including the sleeve and the drive post of nested setting of each other, the sleeve with the drive post sets up hold in the concave part, the sleeve with be provided with the screw drive structure between the drive post, the fixture block wears to establish in the mounting hole, and the upper end of fixture block with the drive post is connected.

The screw driving structure comprises an external thread section and a driving block, and the driving block is embedded into the external thread section.

The telescopic upper end is provided with the chimb, the chimb with the up end butt of pole setting.

And a rotation stopping surface is arranged between the clamping block and the clamping groove, and a rotation stopping surface is also arranged between the clamping block and the mounting hole.

The measuring rod further comprises a limiting structure, and the limiting structure is used for limiting the rotating range between the measuring rod and the vertical rod.

The limiting structure comprises an arc-shaped sliding groove and a sliding block, one of the arc-shaped sliding groove and the sliding block is arranged on the measuring rod, the other of the arc-shaped sliding groove and the sliding block is arranged on the vertical rod, and the sliding block is embedded into the arc-shaped sliding groove.

The measuring structure is two, two the measuring structure sets up relatively, the arc spout includes two relative half slots that set up, the slider is two, two the slider imbeds respectively to two in the half slot.

The side wall of the upright stanchion is provided with a plurality of rotating arms, the measuring structures are arranged on the rotating arms in a one-to-one correspondence manner, and the length of the rotating arms is different.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a pair of slewing bearing diameter measuring device sets up butt portion on the first end of measuring stick, holds rotatable setting pole setting in the second of measuring stick, is provided with a plurality of measurement structures in the pole setting, still is equipped with locking mechanical system, utilizes locking mechanical system to fix the relative position between measuring stick and the pole setting. When different diameters need to be measured, the vertical rod only needs to be rotated to enable different measuring structures to be matched with the abutting connection part respectively, and the locking mechanism is used for fixing, so that the measuring device can be switched, the device can be used for measuring the diameters of different sizes, the diameters of the inner ring and the outer ring of the slewing bearing of different models or the diameters of the roller paths, and the measuring efficiency is high.

2. The utility model provides a pair of slewing bearing diameter measurement device utilizes drive structure drive fixture block activity to insert and locates in the draw-in groove, when fixture block and draw-in groove cooperation joint, can be with the rigidity of measuring the structure, breaks away from the back mutually when fixture block and draw-in groove, can rotate the pole setting, and the convenience is to the regulation of measuring the structure.

3. The utility model provides a pair of slewing bearing diameter measuring device sets up the drive structure into nested sleeve and drive post each other to set up the screw drive structure between sleeve and drive post, consequently, can drive the fixture block under the effect of screw thread, the drive mode is simple, and the fixture block is more convenient at the transformation of latched position and unblock position.

4. The utility model provides a pair of slewing bearing diameter measurement device sets up the drive block, sets up the external screw thread section at the outer wall of drive post through setting up at telescopic inner wall to realize reciprocating of drive post when rotating the sleeve, and drive the fixture block activity and insert and locate in the draw-in groove.

5. The utility model provides a pair of slewing bearing diameter measurement device through set up the chimb in telescopic upper end, the application of force in the sleeve of being convenient for to rotate the sleeve.

6. The utility model provides a pair of slewing bearing diameter measuring device through set up between fixture block and draw-in groove and fixture block and mounting hole between and only change the face, can restrict the fixture block and remove at will in the mounting hole, guarantees that fixture block and draw-in groove correspond the setting to, when the fixture block corresponds the joint with the draw-in groove, guarantee to measure the stability that the structure is in latched position.

7. The utility model provides a pair of slewing bearing diameter measurement device rotates to predetermined position after with when measuring structure through setting up limit structure, restricts the rotation of pole setting, is convenient for adjust measuring structure's position.

8. The utility model provides a pair of slewing bearing diameter measurement device through setting up the arc spout, restricts the slider in arc spout internal rotation to utilize the arc spout to restrict the rotation range of pole setting.

9. The utility model provides a pair of slewing bearing diameter measurement device sets up the measurement structure into two, correspondingly, and the arc spout sets up to two half slots to set up two sliders and imbed two half slots respectively, two measurement structure set up relatively, can carry out 180 rotations, measure with the diameter to two differences, measuring device simple structure, the operation of being convenient for.

10. The utility model provides a pair of slewing bearing diameter measuring device realizes through the rocking arm that sets up different length that has different distances between measurement structure and the pole setting, when the measurement structure of difference cooperates with butt portion, can measure the diameter of different length.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a front sectional view of a slewing bearing diameter measuring device according to an embodiment of the present invention;

fig. 2 is a front sectional view of a locking mechanism according to an embodiment of the present invention;

FIG. 3 is an enlarged view taken at A in FIG. 2;

fig. 4 is a schematic structural view of a vertical rod according to an embodiment of the present invention;

FIG. 5 is a bottom view of FIG. 4;

figure 6 is a perspective view of a groove provided by an embodiment of the present invention;

fig. 7 is a schematic view of a use state of the slewing bearing measuring device according to an embodiment of the present invention when measuring the outer raceway of the slewing bearing.

Description of reference numerals:

1. a measuring rod; 11. an abutting portion; 12. a second support bar; 13. an arc-shaped chute; 14. sealing the cover; 2. erecting a rod; 21. a measurement structure; 211. a ball head; 212. a measuring meter; 213. a connecting rod; 22. a slider; 23. a rotating arm; 231. a first support bar; 24. an annular flange; 3. a locking mechanism; 31. an accommodation recess; 32. a sleeve; 321. a drive block; 322. a convex edge; 33. a drive column; 331. an external threaded section; 34. a clamping block; 35. a clamping groove.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do 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 present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

An embodiment of the slewing bearing diameter measuring device shown in fig. 1 to 6 is used for measuring the diameter of a raceway of an outer ring of a slewing bearing, and comprises: measuring stick 1, pole 2, measuring structure 21 and locking mechanical system 3. Be provided with butt portion 11 on the first end of measuring stick 1, pole setting 2 is rotatable to be set up on the second end of measuring stick 1, and measurement structure 21 is provided with a plurality ofly, and sets up along the circumference interval of pole setting 2, and the distance that a plurality of measurement structure 21's outer end to pole setting 2 is different. The locking mechanism 3 is arranged between the measuring rod 1 and the vertical rod 2 and used for fixing the relative position between the measuring rod 1 and the vertical rod 2.

Through rotating pole setting 2 so that different measurement structure 21 cooperate with butt portion 11 respectively to use locking mechanical system 3 to fix, consequently utilize the device can measure the raceway diameter of different sizes, can be used for measuring the raceway diameter of the slewing bearing's of different models outer lane, measurement efficiency is high.

As shown in fig. 1, a plurality of rotating arms 23 extend from the side wall of the upright 2, the length of the plurality of rotating arms 23 is different, and the plurality of measuring structures 21 are correspondingly arranged on the plurality of rotating arms 23. By providing swivel arms 23 of different lengths, different distances between the measuring structure 21 and the upright 2 are achieved, and diameters of different lengths can be measured when different measuring structures 21 are fitted to the abutment 11.

In the present embodiment, as shown in fig. 1, two measuring structures 21 are provided, and the two measuring structures 21 are oppositely arranged by two rotating arms 23 arranged at 180 °.

In the present embodiment, as shown in fig. 1, the measuring structure 21 includes a ball 211, a measuring gauge 212, and a connecting rod 213 connecting the ball 211 and the measuring gauge 212. The outer end of the rotating arm 23 extends upward to form a first supporting rod 231, a through hole allowing the connecting rod 213 to be slidably inserted is formed in the first supporting rod 231, and a fastening member is further disposed on the first supporting rod 231, when the position of the ball 211 is adjusted, the connecting rod 213 is fixed by the fastening member, and the fastening member may be a bolt.

In the present embodiment, the measuring gauge 212 may be a dial gauge or a dial gauge.

In this embodiment, as shown in fig. 1, a first end of the measuring rod 1 extends upward to form a second supporting rod 12, the abutting portion 11 is also of a ball head structure, and is slidably inserted into a through hole formed in the second supporting rod 12 through a rod, and after the adjustment is completed, the position of the abutting portion 11 is fixed by a fastener.

By arranging the measuring structure 21 and the abutting part 11 to be structures with adjustable positions, the measuring range can be adjusted, and more measuring requirements can be met.

As shown in fig. 1 to 3, the locking mechanism 3 includes a slot 35 opened on the measuring rod 1, a latch 34 movably engaged with the slot 35, and a driving structure for driving the latch 34 to be engaged with or separated from the slot 35. Utilize drive structure drive fixture block 34 activity to insert and locate in draw-in groove 35, when fixture block 34 and draw-in groove 35 cooperation joint, can be with the rigidity of measuring structure 21, break away from the back mutually as fixture block 34 and draw-in groove 35, can rotate pole setting 2, the convenient regulation to measuring structure 21.

As shown in fig. 2, the upright 2 has a concave accommodating portion 31 formed at a middle portion thereof, and a mounting hole is formed at a bottom portion of the concave accommodating portion 31. The driving structure comprises a sleeve 32 which is rotatably arranged in the accommodating concave part 31 and a driving column 33 which is movably arranged in the sleeve 32, and a screw driving structure is arranged between the sleeve 32 and the driving column 33. Specifically, as shown in fig. 3, the inner wall of the sleeve 32 protrudes outward to form a plurality of driving blocks 321, the driving blocks 321 may be spaced apart from one another, the outer wall of the driving column 33 is provided with an external thread section 331, and the driving blocks 321 are inserted into the external thread section 331.

Of course, the screw driving structure may also be composed of an internal thread section provided on the inner wall of the sleeve 32 and an external thread section provided on the outer wall of the driving post 33, i.e., the sleeve 32 and the driving post 33 are threadedly connected by the internal thread section and the external thread section. When the sleeve 32 is rotated, the drive post 33 can move up and down under the influence of the screw thread.

The driving structure is provided with the sleeve 32 and the driving column 33 which are nested with each other, and the screw driving structure is arranged between the sleeve 32 and the driving column 33, so that the up-and-down movement of the driving column 33 can be realized when the sleeve 32 is rotated, the driving mode is simple, and the conversion of the fixture block 34 at the locking position and the unlocking position is more convenient.

In this embodiment, as shown in fig. 2, the latch 34 is a square structure, and correspondingly, the latching slot 35 is a square slot, and the mounting hole is also a square hole, so that rotation-stopping surfaces are disposed between the latch 34 and the latching slot 35, and between the latch 34 and the mounting hole, which can limit the rotation of the latch 34 in the mounting hole, so that when the sleeve 32 rotates, the driving column 33 can only move up and down. Meanwhile, the rotation stopping surface between the clamping block 34 and the clamping groove 35 prevents the vertical rod 2 from rotating relative to the measuring rod 1 when the clamping block 34 is embedded into the clamping groove 35. The fixture block 34 is ensured to be correspondingly arranged with the fixture groove 35, and when the fixture block 34 is correspondingly clamped with the fixture groove 35, the stability of the measuring structure 21 in the locking position is ensured.

In this embodiment, as shown in fig. 2, a connecting block is disposed at the upper end of the latch 34, and the connecting block is clamped in the bottom of the driving post 33 to fixedly connect the driving post 33 and the latch 34.

In this embodiment, as shown in fig. 2, the upper end of the sleeve 32 is formed with a flange 322 extending outwardly to facilitate the application of force to the sleeve 32 for rotating the sleeve 32. At the same time, the collar 322 also limits downward movement of the sleeve 32 within the receiving recess.

In the present embodiment, a bearing is disposed between the sleeve 32 and the accommodating recess, an inner wall of the accommodating recess is connected to an outer ring of the bearing, and an outer wall of the sleeve 32 is connected to an inner ring of the bearing, so that the sleeve 32 is limited inside the accommodating recess while the sleeve 32 is ensured to rotate in the accommodating recess, and the sleeve 32 is prevented from moving in the vertical direction.

As shown in fig. 1 and 2, a groove is formed in the second end of the measuring rod 1, the lower end of the vertical rod 2 is rotatably disposed in the groove, an annular flange 24 is formed by outward protrusion of the outer wall of the vertical rod 2, a sealing cover 14 is disposed in the groove opening of the groove, and the lower surface of the sealing cover 14 is slidably abutted to the upper surface of the annular flange 24. The vertical rod 2 is fixed by restricting the vertical displacement of the vertical rod 2 by the cover 14 and the annular flange 24.

As shown in fig. 4 to 6, a limiting structure is further disposed between the measuring rod 1 and the vertical rod 2 for limiting the rotation range of the vertical rod 2 along the measuring rod 1. The limiting structure comprises an arc-shaped sliding groove 13 and a sliding block 22 which are arranged in a matched mode, and the sliding block 22 is embedded into the arc-shaped sliding groove 13. By arranging the arc-shaped sliding chute 13, the sliding block 22 is limited in the arc-shaped sliding chute 13 to rotate, so that the rotation range of the opposite rod 2 is limited by the arc-shaped sliding chute 13.

In this embodiment, as shown in fig. 4 and 5, the sliding block 22 is disposed on the bottom surface of the vertical rod 2, and is provided with a pair of opposite surfaces, and correspondingly, as shown in fig. 6, the arc-shaped sliding grooves 13 are two semicircular grooves formed at the bottom of the groove, and the ends of the two semicircular grooves are not communicated, so that the end surfaces of the semicircular grooves form a limiting surface, and when the vertical rod 2 rotates to abut against the sliding block 22 and the limiting surface, the vertical rod 2 cannot rotate continuously relative to the measuring rod 1.

Measuring structure 21 sets up to two, correspondingly, arc spout 13 sets up to two semi-circular slots to set up two sliders 22 and imbed two semi-circular slots respectively, two measuring structure 21 set up relatively, can carry out 180 rotations, measure with the diameter to two differences, measuring device simple structure, the operation of being convenient for, simultaneously, the setting up of two semi-circular slots makes the pole setting more steady for the rotation of measuring stick.

Of course, when the measuring structure 21 is provided in plural, the arc chutes 13 may be provided corresponding to the number of the measuring structures 21 and the included angle between the adjacent measuring structures 21.

When the diameter measuring device of the slewing bearing of the embodiment is used, firstly, the two measuring structures 21 are adjusted according to the diameters of the outer ring raceways of the slewing bearings of two different models, and the measuring structures 21 are fixed after the adjustment is finished; when using, rotate the measurement structure 21 of one of them adaptation to be 180 with butt portion 11, rotate sleeve 32 to push drive post 33 downstream under the effect of screw thread, make fixture block 34 joint in draw-in groove 35, with this measurement structure 21's rigidity, then, butt portion 11 and this measurement structure 21 respectively with the diameter looks butt that awaits measuring, and rotate measuring device, observe the numerical value change of gauge 212, can obtain the offset of the diameter that awaits measuring, can obtain the concrete numerical value of the outer lane raceway diameter that surveys. When needing to examine another outer lane raceway diameter, the reverse rotation sleeve 32 can make fixture block 34 and draw-in groove 35 break away from the joint, then rotates pole setting 2 for another measurement structure 21 is 180 settings with butt portion 11, repeats above-mentioned step again and can measure after fixing pole setting 2.

In summary, the diameter measuring device of the slewing bearing provided by the embodiment is used for rotating the vertical rod to enable different measuring structures to be respectively matched with the abutting part and fixing the different measuring structures by using the locking mechanism, so that the diameter measuring device can be used for measuring the diameters of different sizes, namely the diameters or raceway diameters of the inner ring and the outer ring of the slewing bearing with different models, and the measuring efficiency is high.

As an alternative embodiment, the slewing bearing diameter measuring device may be used to measure the inner ring raceway diameter of the slewing bearing, and when measuring the inner ring raceway diameter of the slewing bearing, the orientation of the ball 211 of the measuring structure 21 and the ball structure of the abutment 11 shown in fig. 1 may be horizontally rotated by 180 °.

As an alternative embodiment, the slewing bearing diameter measuring device may also be used for measuring the diameters of the outer ring and the inner ring of the slewing bearing, and for the convenience of measurement, the ball 211 of the measuring structure 21 and the ball structure of the abutting portion 11 may be replaced by a rod-shaped structure abutting against the outer ring or the inner ring.

As an alternative embodiment, the length of the swivel arm 23 can be the same, and the distance from the ball 211 to the upright 2 can be adjusted by adjusting the length of the ball 211 protruding.

As an alternative embodiment, the slide 22 can be arranged on the bottom of the groove, and the arc-shaped sliding groove 13 can be opened on the bottom surface of the upright.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. A slewing bearing diameter measuring device, comprising:

the measuring device comprises a measuring rod (1), wherein a first end of the measuring rod (1) is provided with a butting part (11);

the vertical rod (2) is rotatably arranged at the second end of the measuring rod (1);

the measuring structures (21) are arranged on the vertical rods (2) and are provided with a plurality of measuring structures;

the locking mechanism (3) is arranged between the measuring rod (1) and the vertical rod (2), and the locking mechanism (3) is used for fixing the relative position between the measuring rod (1) and the vertical rod (2).

2. The slewing bearing diameter measuring device according to claim 1, wherein the locking mechanism (3) comprises:

the clamping groove (35) is arranged on the measuring rod (1);

the clamping block (34) is movably arranged on the vertical rod (2), and the clamping block (34) is provided with a locking position embedded into the clamping groove (35) and an unlocking position separated from the clamping groove (35);

the driving structure is arranged on the vertical rod (2) and used for driving the clamping block (34) to move between a locking position and an unlocking position.

3. The slewing bearing diameter measuring device according to claim 2, wherein the upper surface of the upright rod (2) is provided with a receiving recess (31), the bottom wall of the receiving recess (31) is provided with a mounting hole, the driving structure comprises a sleeve (32) and a driving column (33) which are nested with each other, the sleeve (32) and the driving column (33) are arranged in the receiving recess (31), a spiral driving structure is arranged between the sleeve (32) and the driving column (33), the clamping block (34) is arranged in the mounting hole in a penetrating manner, and the upper end of the clamping block (34) is connected with the driving column (33).

4. The slewing bearing diameter measuring device of claim 3, wherein the helical drive structure comprises an external threaded section (331) and a drive block (321), the drive block (321) being embedded within the external threaded section (331).

5. Slewing bearing diameter measuring device according to claim 3, characterised in that the upper end of the sleeve (32) is provided with a collar (322), which collar (322) abuts the upper end face of the upright (2).

6. The slewing bearing diameter measuring device according to claim 3, wherein a rotation stop surface is arranged between the clamping block (34) and the clamping groove (35), and a rotation stop surface is also arranged between the clamping block (34) and the mounting hole.

7. Slewing bearing diameter measuring device according to any of claims 1-6, characterized in that it further comprises a limiting structure for limiting the range of rotation between the measuring rod (1) and the upright (2).

8. The slewing bearing diameter measuring device according to claim 7, wherein the limiting structure comprises an arc-shaped sliding groove (13) and a sliding block (22), one of the arc-shaped sliding groove (13) and the sliding block (22) is arranged on the measuring rod (1), the other of the arc-shaped sliding groove (13) and the sliding block (22) is arranged on the vertical rod (2), and the sliding block (22) is embedded into the arc-shaped sliding groove (13).

9. The slewing bearing diameter measuring device according to claim 8, wherein the number of the measuring structures (21) is two, the two measuring structures (21) are oppositely arranged, the arc-shaped sliding groove (13) comprises two oppositely arranged semicircular grooves, the number of the sliding blocks (22) is two, and the two sliding blocks (22) are respectively embedded into the two semicircular grooves.

10. A slewing bearing diameter measuring device according to any one of claims 1-6, characterized in that a plurality of swivel arms (23) are arranged on the side wall of the upright (2), a plurality of measuring structures (21) are arranged on the swivel arms (23) in a one-to-one correspondence, and the length of the swivel arms (23) is different.

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