A relative flatness position gauge kit

Abstract

This utility model relates to the field of automotive parts manufacturing and testing technology, and more specifically, to a relative planar position measurement fixture kit, including a testing platform and a measuring component. The testing platform includes a guide block, a fixed reference platform, and a movable measuring platform. The guide block is connected to the fixed reference platform, and the movable measuring platform is slidably connected to the guide block. The fixed reference platform and the movable measuring platform are completely parallel to each other along the length of the guide block and are both perpendicular to the guide block. The measuring component is placed on the testing platform. This utility model enables rapid and convenient testing of the relative planar position of welded subframe workpieces.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing and testing technology, and more specifically, to a relative planar position measurement tool kit. Background Technology

[0002] The automotive subframe, as a core load-bearing and connecting component of the chassis system, is mainly composed of various welded metal parts. After welding, it undergoes processes such as electrophoretic coating and press-fitting of bushings before being delivered to the OEM for assembly of key components such as control arms, suspension systems, and powertrains. The relative positional accuracy (especially the relative planar relationship) between the corresponding mounting surfaces of different mounting points of the same control arm on the subframe has strict tolerance requirements. This positional accuracy is a key factor in ensuring the smooth and accurate assembly of the control arm and guaranteeing the subsequent driving performance and safety of the entire vehicle.

[0003] However, the subframe main structure relies on welding, and the unavoidable thermal deformation during welding is a major challenge affecting the final precision of the parts. Although welding fixtures are designed to control and constrain this deformation, the complexity of the parts structure, the rationality of the fixture design, and fluctuations in welding parameters all contribute to variations in deformation control across different production batches and even within a single batch, leading to fluctuations in the critical positional accuracy of the final product. Therefore, we need to perform precision inspection on the welded subframe workpieces to prevent defective products from being shipped out, and achieving rapid detection of critical positional defects is the core of controlling quality risks. Currently, automotive suppliers generally lack effective means for convenient and rapid detection of such relative planar positional accuracy to meet the urgent needs of the modern automotive manufacturing industry for high-efficiency and high-quality control. Utility Model Content

[0004] The purpose of this invention is to overcome the difficulty of using existing testing methods to quickly and conveniently detect the planar position of automotive subframe workpieces, and to provide a relative planar position inspection tool kit to achieve quick and convenient detection of the relative planar position of welded subframe workpieces.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A relative planar position measurement fixture kit is provided, including a testing platform and a measuring component. The testing platform includes a guide block, a fixed reference platform, and a movable measuring platform. The guide block is connected to the fixed reference platform, and the movable measuring platform is slidably connected to the guide block. The fixed reference platform and the movable measuring platform are completely parallel to the guide block in the length direction and are both perpendicular to the guide block. The measuring component is placed on the testing platform.

[0007] In the above-described process, firstly, the subframe workpiece to be inspected is securely positioned on the inspection platform, ensuring that its first test plane (serving as a reference plane) is tightly fitted and fixed to the fixed reference platform. Then, the operator smoothly slides the measuring platform along the length of the guide block, gradually bringing it closer to the workpiece's second test plane. Under the precise constraint of the guide block, the moving measuring platform remains perfectly parallel to the fixed reference platform, thus ensuring the stability and directional consistency of the measurement reference. The moving measuring platform is adjusted to be close to the second test plane, but not in direct contact with it, forming a small gap (approximately 3mm to 5mm). At this point, a selected measuring component (such as a precision feeler gauge or dial indicator) is carefully inserted into this gap. This measuring component can directly read the actual gap distance between the working surface of the moving measuring platform and the second test plane of the workpiece, or estimate the gap range between the two planes. To comprehensively evaluate the parallelism or positional deviation of the second test plane relative to the first reference plane, the operator needs to repeat the insertion of the measuring component at different edge positions of the second test plane of the workpiece (usually selecting key or representative positions). Finally, multiple gap measurement readings or estimation results obtained at different positions on the second test plane are directly compared. If all readings are the same or consistent within the allowable error range specified by the process, it indicates that the relative position of the two planes meets the requirements and the workpiece is qualified; conversely, if the readings differ beyond the allowable range, the workpiece is deemed unqualified. This method eliminates the need for complex calculations or coordinate system transformations, directly relying on measured values ​​for judgment, significantly improving inspection efficiency and operational convenience. Furthermore, the measuring platform can be slidably moved to match and adapt to different sizes of subframes or two test planes with different spacing on the same subframe, thus enabling high accuracy testing, demonstrating high versatility.

[0008] Furthermore, a locking mechanism is included, which connects the guide block and the moving measuring platform. The guide block is provided with a scale. The moving measuring platform needs to be slidably adjusted before measurement and needs to be stably fixed during measurement for accurate measurement. The function of the locking mechanism is to fix the moving measuring platform for subsequent measurement work. The guide block is provided with a scale. During testing, the second plane to be measured on the subframe workpiece is aligned with the scale on the guide block, and the first reading can be directly read. When the measuring tool is used for measurement, the reading on the measuring tool is read. The second reading is obtained by adding the reading on the measuring tool to the distance that the moving measuring platform slides on the guide block. By comparing the two readings, the relative position of the two planes can be directly determined.

[0009] Furthermore, the locking mechanism includes a first bolt, and a threaded through hole is provided on the movable measuring platform. When the locking mechanism is in the locked state, the first bolt passes through the threaded through hole and abuts against the guide block. The locking mechanism is in the form of a bolt. When locked, the first bolt is screwed into the threaded hole and presses against the guide block, thereby fixing the movable measuring platform by friction.

[0010] Furthermore, it also includes a limiting mechanism, which is installed at one end of the guide block near the mobile measuring platform; in order to prevent the mobile measuring platform from sliding out of the guide block, the limiting mechanism is set to restrict the mobile measuring platform.

[0011] Furthermore, the limiting mechanism includes a second bolt, which is threadedly connected to the guide block; the limiting mechanism also adopts the form of a bolt, using the nut at the protruding head of the bolt to block the moving measuring platform, and the second bolt can be removed for maintenance when needed, which is convenient and quick.

[0012] Furthermore, the fixed reference platform is a permanent magnet; the fixed reference platform uses magnetic attraction to fix the first test plane of the subframe workpiece.

[0013] Furthermore, the testing platform is also equipped with a storage device, on which the measuring components are placed. By setting up a storage device on the testing platform to store the testing components, the measuring components can be directly taken out from the storage device when in use. After the test is completed, the measuring components are put back into the storage device, avoiding workers from randomly placing the measuring components everywhere, which would make them difficult to find for the next measurement.

[0014] Furthermore, the measuring component includes a measuring ruler and a go / no-go gauge. The storage device includes a first storage slot and a second storage slot disposed on the fixed reference platform. The measuring ruler and the go / no-go gauge are respectively placed in the first storage slot and the second storage slot. The storage device is a slot disposed on the fixed reference platform. The measuring ruler and the go / no-go gauge are attracted by the fixed reference platform through a permanent magnet, ensuring the stable storage of the measuring component. The measuring ruler is a feeler gauge with a triangular measuring part and graduations. During measurement, the measuring part at the tip of the triangle is inserted into the gap between the second plane to be measured and the plane of the moving measuring platform. The measuring ruler is inserted until the value on the graduations is within the gap between the two planes. When the values ​​are equal, the measuring gauge cannot be inserted further, thus directly and accurately displaying the size of the gap at the edges of the two planes. The go / no-go gauge is a tool for rough measurement. Its measuring part is a rod or plate with different thicknesses on both sides. During measurement, first insert the side of the go / no-go gauge with the larger thickness between the two planes. If it cannot be inserted normally, it means that the gap is smaller than the size of that side. Then insert the other side with the smaller thickness. If it can be inserted normally, it means that the gap between the two planes is within the thickness range of the measuring parts on both sides of the go / no-go gauge. By judging whether both sides can be inserted normally, it can be determined that the gap between the two planes falls within the allowable error range, thus achieving a rough detection of the position between the two planes.

[0015] Furthermore, it also includes a first connecting block and a second connecting block. One end of the first connecting block is fixedly connected to the guide block, and the other end is rotatably connected to the fixed reference platform. One end of the second connecting block is slidably connected to the guide block, and the other end is rotatably connected to the mobile measuring platform. The rotation effect of the fixed reference platform and the mobile measuring platform is achieved through the first connecting block and the second connecting block. When the entire fixture is stored, rotating the fixed reference platform and the mobile measuring platform causes the plane centers of the two platforms to rotate closer to the center of the guide block, reducing the space occupied by the entire fixture and improving the utilization rate of the storage space.

[0016] Furthermore, locking components are installed on both the first and second connecting blocks. These locking components are used to lock the rotational degrees of freedom of the fixed reference platform relative to the first connecting block and the rotational degrees of freedom of the moving measuring platform relative to the second connecting block. During measurement, neither the moving measuring platform nor the fixed reference platform can rotate. Therefore, locking components are used to lock their rotational degrees of freedom. The locking components can be in the form of bolt threaded connections. Threaded through holes are drilled on the first and second connecting blocks, and threaded blind holes are drilled on the moving measuring platform and the fixed reference platform. During measurement, the moving measuring platform and the fixed reference platform are rotated until both are perpendicular to the guide block. At this time, the axes of the threaded blind holes and the threaded through holes coincide. Then, a bolt is driven into one end of the threaded through hole, so that the bolt passes through the threaded through hole and enters the threaded blind hole, thus completing the locking of the rotational degrees of freedom.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The inspection platform includes a guide block, a fixed reference platform, and a moving measurement platform. The guide block is connected to the fixed reference platform, and the moving measurement platform is slidably connected to the guide block. The fixed reference platform and the moving measurement platform are completely parallel to each other along the length of the guide block and are both perpendicular to the guide block. The measurement components are placed on the inspection platform. The core working principle is to construct a stable and accurate measurement reference platform and use the movable measurement platform to achieve direct multi-point measurement, thereby quickly and intuitively evaluating the relative position of two key planes on the workpiece. At the same time, for subframes of different sizes or two inspection planes of the same subframe with different spacing, the moving measurement platform can be slid to match and adapt to them for accuracy inspection, which has high versatility.

[0019] 2. The testing platform is also equipped with a storage device. When in use, the measuring component can be directly taken out from the storage device. After the test is completed, the measuring component is put back into the storage device, which makes it convenient for workers to store and retrieve the workpiece. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of a measuring component of a relative planar position gauge kit during measurement;

[0021] Figure 2 This is a schematic diagram of a relative planar position gauge kit;

[0022] Figure 3 A schematic diagram of the structure of a relative planar position gauge kit with a first connecting block and a second connecting block installed.

[0023] In the attached diagram: 100, detection platform; 110, guide block; 120, fixed reference platform; 130, mobile measuring platform; 140, storage device; 141, first storage slot; 142, second storage slot; 200, measuring component; 210, measuring ruler; 220, go / no-go gauge; 300, locking mechanism; 310, first bolt; 400, limiting mechanism; 410, second bolt; 500, first connecting block; 600, second connecting block; 700, first plane to be measured; 800, second plane to be measured. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0025] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] Example 1

[0027] This embodiment is a first embodiment of a relative planar position gauge kit, such as Figure 1 and 2 As shown, the system includes a detection platform 100 and a measurement component 200. The detection platform 100 includes a guide block 110, a fixed reference platform 120, and a movable measurement platform 130. The guide block 110 is connected to the fixed reference platform 120, and the movable measurement platform 130 is slidably connected to the guide block 110. The fixed reference platform 120 and the movable measurement platform 130 are completely parallel in the length direction of the guide block 110 and are both perpendicular to the guide block 110. The measurement component 200 is placed on the detection platform 100.

[0028] Specifically, it also includes a locking mechanism 300, which connects the guide block 110 and the moving measuring platform 130. The guide block 110 is equipped with a scale. The moving measuring platform 130 needs to be slidably adjusted before measurement and needs to be stably fixed during measurement for accurate measurement. The function of the locking mechanism 300 is to fix the moving measuring platform 130 for subsequent measurement work. The guide block 110 is equipped with a scale. During testing, the second plane 800 to be measured on the subframe workpiece is aligned with the scale of the guide block 110, and the first reading can be directly read. When the measuring tool is used for measurement, the reading on the measuring tool is read. The second reading is obtained by adding the reading on the measuring tool to the distance that the moving measuring platform 130 slides on the guide block 110. By comparing the two readings, the relative position of the two planes can be directly determined.

[0029] Specifically, the locking mechanism 300 includes a first bolt 310. A threaded through hole is provided on the movable measuring platform 130. When the locking mechanism 300 is in the locked state, the first bolt 310 passes through the threaded through hole and abuts against the guide block 110. The locking mechanism 300 is in the form of a bolt. When locked, the first bolt 310 is screwed into the threaded hole and presses against the guide block 110, thereby fixing the movable measuring platform 130 by friction.

[0030] Specifically, it also includes a limiting mechanism 400, which is installed at one end of the guide block 110 near the moving measurement platform 130. To prevent the moving measurement platform 130 from sliding out of the guide block 110, the limiting mechanism 400 is set to restrict the moving measurement platform 130.

[0031] Specifically, the limiting mechanism 400 includes a second bolt 410, which is threadedly connected to the guide block 110. The limiting mechanism 400 also adopts the form of a bolt, using the nut at the protruding head of the bolt to block the moving measuring platform 130. When maintenance is required, the second bolt 410 can be removed for inspection, which is convenient and quick.

[0032] The working principle of a relative planar position gauge kit in this embodiment is as follows:

[0033] Fix the fixed reference platform 120 on the first test plane 700 of the workpiece. Slide and adjust the moving measuring platform 130 to a distance of about 3mm to 5mm from the second test plane 800. Then, operate the first bolt 310 of the locking mechanism 300 to fix the moving measuring platform 130. Finally, place the measuring component 200 into the gap between the moving measuring platform 130 and the second test plane 800. Measure the size of the gap or estimate the range of the gap size. Repeatedly insert the measuring component 200 at different edge positions of the gap. If all readings are the same or consistent within the allowable error range specified by the process, it indicates that the relative position of the two planes meets the requirements and the workpiece is qualified. Conversely, if the readings have differences exceeding the allowable range, the workpiece is deemed unqualified.

[0034] The beneficial effects of this embodiment are: the fixed reference platform 120, in conjunction with the movable measuring platform, enables direct multi-point measurement of two planes, which can quickly and intuitively evaluate the relative position of two key planes on the workpiece. For subframes of different sizes or two detection planes of the same subframe with different spacing, the measuring platform 130 can be slidably moved to match and adapt to them, thereby performing accuracy detection, which has high versatility.

[0035] Example 2

[0036] This embodiment is a second embodiment of a relative planar position gauge kit, such as... Figure 1 As shown, the difference from Embodiment 1 is as follows:

[0037] Furthermore, the fixed reference platform 120 is a permanent magnet; the fixed reference platform 120 uses magnetic attraction to fix the first test plane 700 of the subframe workpiece.

[0038] Specifically, such as Figure 2 As shown, the testing platform 100 is also equipped with a storage device 140, on which the measuring component 200 is placed. The storage device 140 on the testing platform 100 stores the testing components. When in use, the measuring component 200 is directly taken out from the storage device 140. After the test is completed, the measuring component 200 is put back into the storage device 140, which avoids workers from randomly placing the measuring component 200 and making it difficult to find it for the next measurement.

[0039] Specifically, the measuring component 200 includes a measuring ruler 210 and a go / no-go gauge 220. The storage device 140 includes a first storage slot 141 and a second storage slot 142 disposed on the fixed reference platform 120. The measuring ruler 210 and the go / no-go gauge 220 are respectively placed in the first storage slot 141 and the second storage slot 142. The storage device 140 is a slot disposed on the fixed reference platform 120. The measuring ruler 210 and the go / no-go gauge 220 are attracted by the fixed reference platform 120 with a permanent magnet, ensuring the stable storage of the measuring component 200. The measuring ruler 210 is a feeler gauge. Its measuring part is triangular and has a scale. During measurement, the measuring part with the tip of the triangle is inserted into the gap between the second plane to be measured 800 and the plane of the moving measuring platform 130. When the value on the scale equals the gap value between the two planes, the measuring ruler 210 cannot be inserted further, thus directly and accurately displaying the size of the gap at the edges of the two planes. The go / no-go gauge 220 is a coarse measuring tool. Its measuring part is a rod or plate with different thicknesses on both sides. During measurement, first insert the side of the go / no-go gauge 220 with the larger thickness between the two planes. If it cannot be inserted normally, it means that the gap is smaller than the size of that side. Then insert the other side with the smaller thickness. If it can be inserted normally, it means that the gap between the two planes is within the thickness range of the measuring parts on both sides of the go / no-go gauge 220. By judging whether both sides can be inserted normally, it is determined that the gap between the two planes falls within the allowable error range, thus achieving a coarse detection of the position between the two planes.

[0040] The working principle of a relative planar position gauge kit in this embodiment is as follows:

[0041] For precise measurements, a measuring ruler 210 is used. The measuring part of the triangular tip of the measuring ruler 210 is inserted between the second plane to be measured 800 and the plane of the moving measuring platform 130 to directly and accurately display the size of the gap at the edges of the two planes. For range estimation, a go / no-go gauge 220 is used. The measuring parts on both sides of the go / no-go gauge 220 are inserted one after the other. If the larger side cannot be inserted but the smaller side can be inserted normally, the gap size is within the range of the two measuring parts. If neither side can be inserted, the gap size is less than the minimum value. If both sides can be inserted, the gap size exceeds the maximum value. After the measurement is completed, the measuring component 200 is placed in the first storage slot 141 and the second storage slot 142 of the storage device 140, and the measuring component 200 is held in place by magnetism to prevent it from falling.

[0042] The beneficial effects of this embodiment are: the storage device 140 makes it convenient to directly take out the measuring component 200 from the storage device 140 when using it, and put the measuring component 200 back into the storage device 140 after the test is completed, thereby improving the efficiency of the kit.

[0043] Example 3

[0044] This embodiment is a third embodiment of a relative planar position gauge kit, such as... Figure 3 As shown, the difference from Embodiment 1 is as follows:

[0045] Furthermore, it also includes a first connecting block 500 and a second connecting block 600. One end of the first connecting block 500 is fixedly connected to the guide block 110, and the other end is rotatably connected to the fixed reference platform 120. One end of the second connecting block 600 is slidably connected to the guide block 110, and the other end is rotatably connected to the movable measuring platform 130. The rotation effect of the fixed reference platform 120 and the movable measuring platform 130 is achieved through the first connecting block 500 and the second connecting block 600. When the entire fixture is stored, rotating the fixed reference platform 120 and the movable measuring platform 130 causes the plane center of the two platforms to rotate closer to the center of the guide block 110, reducing the space occupied by the entire fixture and improving the utilization rate of the storage space.

[0046] Furthermore, locking components are installed on both the first connecting block 500 and the second connecting block 600. The locking components are used to lock the rotational degree of freedom of the fixed reference platform 120 relative to the first connecting block 500 and the rotational degree of freedom of the moving measuring platform 130 relative to the second connecting block 600. During measurement, neither the moving measuring platform 130 nor the fixed reference platform 120 can rotate. Therefore, locking components are set to lock their rotational degree of freedom. The locking components can be in the form of bolt threaded connection. Threaded through holes are drilled on the first connecting block 500 and the second connecting block 600, and threaded blind holes are drilled on the moving measuring platform 130 and the fixed reference platform 120. During measurement, the moving measuring platform 130 and the fixed reference platform 120 are rotated until both are perpendicular to the guide block 110. At this time, the axes of the threaded blind hole and the threaded through hole coincide. Then, a bolt is driven into one end of the threaded through hole so that the bolt passes through the threaded through hole and enters the threaded blind hole, thus completing the locking of the rotational degree of freedom.

[0047] The working principle of a relative planar position gauge kit in this embodiment is as follows:

[0048] When storing the kit, rotate the fixed reference platform 120 and the movable measuring platform 130 so that the center of the plane of the two platforms moves closer to the center of the guide block 110, and the kit can be stored in the small cuboid storage box. When measurement is required, rotate the fixed reference platform 120 and the movable measuring platform 130 in the opposite direction so that the two platforms are fully open. After fixing with locking parts, measurement work can be carried out.

[0049] The beneficial effects of this embodiment are: the rotational arrangement of the first connecting block 500 and the second connecting block 600 can reduce the space occupied by the entire fixture when it is stored, thereby improving the utilization rate of the storage space.

[0050] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A relative flatness position gage kit comprising a detection platform (100) and a measurement assembly (200), characterized in that, The detection platform (100) includes a guide block (110), a fixed reference platform (120), and a moving measurement platform (130). The guide block (110) is connected to the fixed reference platform (120), and the moving measurement platform (130) is slidably connected to the guide block (110). The fixed reference platform (120) and the moving measurement platform (130) are parallel to each other and both perpendicular to the guide block (110). The measurement component (200) is placed on the detection platform (100).

2. A kit for the determination of relative flatness according to claim 1, wherein, It also includes a locking mechanism (300) for connecting the guide block (110) and the moving measuring platform (130), and the guide block (110) is provided with a scale.

3. A kit for the determination of relative flatness according to claim 2, wherein, The locking mechanism (300) includes a first bolt (310). The moving measuring platform (130) is provided with a threaded through hole. When the locking mechanism (300) is in the locked state, the first bolt (310) passes through the threaded through hole and abuts against the guide block (110).

4. A kit for the inspection of relative flatness according to claim 1, wherein, It also includes a limiting mechanism (400), which is installed at one end of the guide block (110) near the mobile measuring platform (130).

5. A kit for the determination of relative flatness according to claim 4, wherein, The limiting mechanism (400) includes a second bolt (410), which is threadedly connected to the guide block (110).

6. A kit for the inspection of relative flatness according to claim 1, wherein, The fixed reference platform (120) is a permanent magnet.

7. A kit for the relative flatness of a workpiece according to claim 6, wherein, The detection platform (100) is also provided with a storage device (140), and the measuring component (200) is placed on the storage device (140).

8. A kit for the determination of relative flatness according to claim 7, wherein, The measuring component (200) includes a measuring ruler (210) and a go / no-go gauge (220). The storage device (140) includes a first storage slot (141) and a second storage slot (142) disposed on the fixed reference platform (120). The measuring ruler (210) and the go / no-go gauge (220) are respectively placed on the first storage slot (141) and the second storage slot (142).

9. A relative planar position measurement fixture kit according to claim 1, characterized in that, It also includes a first connecting block (500) and a second connecting block (600). One end of the first connecting block (500) is fixedly connected to the guide block (110), and the other end is rotatably connected to the fixed reference platform (120). One end of the second connecting block (600) is slidably connected to the guide block (110), and the other end is rotatably connected to the mobile measuring platform (130).

10. A kit for the determination of relative flatness according to claim 9, wherein, Both the first connecting block (500) and the second connecting block (600) are equipped with locking components, which are used to lock the rotational degree of freedom of the fixed reference platform (120) relative to the first connecting block (500) and the rotational degree of freedom of the moving measuring platform (130) relative to the second connecting block (600).

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