Coordinate measuring machine

Abstract

The utility model discloses a three -coordinate measuring machine, including: first guide rail, second guide rail, crossbeam is connected with first connecting component and second connecting component respectively at both ends, first air -float subassembly is assembled on first connecting component, at the top and both sides position of first guide rail, first grating ruler is set up on first guide rail, first reading head is assembled on first connecting component, second air -float subassembly is set up on second connecting component, is arranged at the top of second guide rail, second grating ruler is assembled on second guide rail, floating reading unit is assembled on second connecting component, including: air -float block, air -float mounting and air -float assembly spare, and its screwing is connected with air -float block in air -float mounting, elastic component is connected with air -float mounting, second reading head is installed on air -float mounting, the three -coordinate measuring machine proposed by the utility model, it can effectively guarantee the reading head and grating ruler between second guide rail place keep stable interval.

Description

Technical Field

[0001] This utility model belongs to the field of measurement technology, specifically, it relates to an improvement in the structure of a coordinate measuring machine. Background Technology

[0002] In a coordinate measuring machine (CMM), the grating ruler and the reading head are the core components for achieving high-precision position feedback. When a certain axis of the CMM moves, the reading head moves with the axis, scanning the grating ruler fixed on the machine bed and reading the position change in real time. Based on the signal fed back from the reading head, the control system precisely controls the servo motor to achieve positioning accuracy at the micron or even sub-micron level.

[0003] The accuracy of the reading head installation is particularly important. To ensure the stability of the gap between the reading head and the grating ruler (the gap is usually between 0.15mm and 0.3mm), the conventional reading head installation usually adopts a fixed installation method, relying on the axial guide system itself to ensure the stability of the gap between the reading head and the grating ruler.

[0004] In coordinate measuring machines (CMMs), the direction of the crossbeam is typically defined as the X-axis, the direction of the two parallel guide rails as the Y-axis, and the direction perpendicular to the ground as the Z-axis. If a dual-grating scheme is used in the Y-axis, both the main and auxiliary guide rails need to be equipped with grating rulers and reading heads.

[0005] To ensure the accuracy of the reading head at the main guide rail, a guide positioning structure is usually installed at the main guide rail. If the main and auxiliary guide rails are not parallel in the horizontal plane, the fixed installation of the reading head at the auxiliary guide rail will cause the gap between the auxiliary reading head and its corresponding auxiliary grating ruler to not be maintained at the set spacing value. In severe cases, it may cause the auxiliary reading head to collide with the auxiliary grating ruler.

[0006] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0007] This invention addresses the aforementioned technical problems of existing coordinate measuring machines (CMMs) by proposing a CMM that effectively ensures a stable distance between the reading head at the secondary guide rail and its corresponding grating ruler.

[0008] To achieve the above-mentioned utility model / design objectives, the present utility model adopts the following technical solution: A coordinate measuring machine includes: First guide rail; Second guide rail; The crossbeam is connected at both ends to the first connecting member and the second connecting member, respectively. The first air flotation component is assembled on the first connecting member and is arranged at the top and both sides of the first guide rail. The first drive mechanism is assembled on the first connecting member and is used to drive the first connecting member to move the crossbeam. The first grating ruler is mounted on the first guide rail; The first reading head is mounted on the first connecting member and is used to read the first grating ruler. The second air flotation component is disposed on the second connecting member and arranged on the top of the second guide rail; The second grating ruler is mounted on the second guide rail; A floating reading unit, assembled on the second connecting member, includes: Air flotation blocks; Air flotation installation components; The air flotation assembly is screwed into the air flotation mounting component and connected to the air flotation block; An elastic member is connected to the air flotation mounting component; The second reading head is installed on the air flotation mounting component.

[0009] Compared with the prior art, the advantages and positive effects of this utility model are: The coordinate measuring machine proposed in this invention is equipped with a floating reading head unit, including an air float block, an air float mounting component, and an air float assembly. The second reading head is fixed to the air float mounting component, which is connected to an elastic component that is connected to a second connecting component. When the air float block is ventilated and adjusted to the working air pressure, an air film is formed between the air float block and the second guide rail, acting on the air float block. By twisting the air float assembly, the air float block is squeezed, and the air float block transmits a reverse force to the air float assembly and the elastic component connected to it, causing the elastic component to deform. At the same time, the elastic component provides an elastic preload to the air float block, ensuring that the gap between the air float block and the second guide rail can be maintained within a stable range of 7-10μm. Since the second grating ruler is attached to the second guide rail and the second reading head is fixed to the air float mounting component, the second reading head supported by the air float mounting component will also maintain a stable distance from the second grating ruler. This prevents the second reading head assembly from colliding with the second grating ruler due to poor parallelism between the first and second guide rails on the horizontal plane.

[0010] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a three-dimensional structural diagram of one embodiment of the coordinate measuring machine proposed in this utility model; Figure 2 This invention relates to a three-dimensional structure of a floating reading unit in an embodiment of a coordinate measuring machine. Figure 1 ; Figure 3 This invention relates to a three-dimensional structure of a floating reading unit in an embodiment of a coordinate measuring machine. Figure 2 ; Figure 4 This is a front view of the floating reading unit of an embodiment of the coordinate measuring machine proposed in this utility model; Figure 5 for Figure 4 Sectional view along axis AA; Figure 6 for Figure 4 BB-direction sectional view; Figure 7 This is a front view of the floating reading unit of an embodiment of the coordinate measuring machine proposed in this utility model; Figure 8 for Figure 7 CC-direction sectional view. In the diagram, 100 is the first guide rail; 110 is the first grating ruler; 120 is the first reading head; 200 is the second guide rail; 210 is the second grating ruler; 220 is the second reading head; 230 is the reading head mounting base; 231 is the mounting hole; 300 is the crossbeam; 400 is the first connecting member; 500 is the second connecting member; 600 is the first air flotation assembly; 700 is the first drive mechanism; 800 is the second air flotation assembly; and 910 is the air... Float; 911, Ball head; 912, Limiting device; 920, Air flotation mounting component; 921, Threaded hole; 930, Air flotation assembly; 931, Ball socket; 940, Elastic component; 941, First component; 942, Second component; 943, Elastic element; 951, Spherical sleeve; 952, Spherical mating part; 953, Locking component; 960, Fastening nut; 970, Second drive mechanism; 980, Limiting component. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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, they should not be construed as limitations on this utility model.

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0016] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0017] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] In some embodiments of this application, a coordinate measuring machine is proposed, comprising: A first guide rail 100, a second guide rail 200, and a crossbeam 300 that can move along the first guide rail 100 and the second guide rail 200.

[0019] In the specific arrangement, a first connecting member 400 and a second connecting member 500 are respectively connected to both ends of the crossbeam 300.

[0020] A first air flotation assembly 600 is arranged on the first connecting member 400, and the first air flotation assembly 600 is arranged at the top and both sides of the first guide rail 100.

[0021] The first drive mechanism 700 is assembled on the first connecting member 400 and is used to drive the first connecting member 400 to move the crossbeam 300.

[0022] The first grating ruler 110 is mounted on the first guide rail 100; The first reading head 120 is mounted on the first connecting member 400 and is used to read the first grating ruler 110.

[0023] When the first driving mechanism 700 drives the first connecting member 400 to move, the first connecting member 400 is connected to the crossbeam 300, which in turn drives the crossbeam 300 to move along the first guide rail 100. When the first connecting member 400 moves, it can drive the first reading head 120 above it to move and thus read the first grating ruler 110 fixedly mounted on the first guide rail 100.

[0024] As the crossbeam 300 moves along the first guide rail 100, its movement can be guided by the first air flotation assembly 600 arranged on the first connecting member 400.

[0025] In some embodiments of this application, the first connecting member 400 includes: The first connecting plate is connected to the end of the crossbeam 300; The second connecting plate assembly is connected to the first connecting plate and spans across the first guide rail 100. The first drive mechanism 700 is assembled onto the second connecting plate assembly. The first drive mechanism 700 may be a motor gear drive mechanism of the prior art, and a first rack that cooperates with the output gear of the motor gear drive mechanism is provided on the first guide rail 100.

[0026] The motor gear drive mechanism drives the first connecting member 400 and the crossbeam 300 to move along the first rack.

[0027] The first air flotation assembly 600 includes a top air flotation assembly, which is arranged at the top side of the second connecting plate assembly. The top air flotation assembly includes a plurality of top air flotation blocks 910, which are fixedly connected to the top wall of the second connecting plate assembly.

[0028] The side air flotation assembly is provided in two sets, which are respectively arranged on both sides of the second connecting plate assembly. The side air flotation assembly includes a side air flotation block 910.

[0029] Side air flotation components arranged on both sides of the second connecting plate assembly can be used to guide the movement of the crossbeam 300.

[0030] Meanwhile, the first reading head 120 is fixedly connected to the side of the second connecting plate assembly. The positioning and guiding effect of the side air flotation component set at the side position can ensure the stability of the distance between the first reading head 120 and the first grid ruler.

[0031] The second air flotation component 800 is disposed on the second connecting member 500 and arranged on the top of the second guide rail 200.

[0032] The second air flotation assembly 800 includes a plurality of second air flotation blocks 910, which are mainly disposed at the top position of the second guide rail 200.

[0033] The second grating ruler 210 is mounted on the second guide rail 200.

[0034] The second drive mechanism 970 is mounted on the second connecting member 500 and is used to drive the crossbeam 300 to move along the second guide rail 200. Its structure is the same as that of the first drive mechanism 700, and a second rack that cooperates with it is provided on the second guide rail 200.

[0035] Since no positioning guide air flotation structure is set at both sides of the second guide rail 200, if the second guide rail 200 and the first guide rail 100 are not parallel in the horizontal plane, the reading head installed at the side of the second connecting member 500 may collide with the second grid ruler because the first guide rail 100 and the second guide rail 200 are not parallel.

[0036] To address the aforementioned issues, this embodiment proposes a floating reading unit that can ensure the second reading head 220 and the second grid ruler remain within a set spacing range even when the first guide rail 100 and the second guide rail 200 are not parallel, thereby guaranteeing measurement accuracy.

[0037] In some embodiments of this application, the floating reading unit includes: The air flotation block 910, the air flotation mounting component 920, and the air flotation fitting 930 for connecting the air flotation mounting component 920 and the air flotation block 910. The air flotation fitting 930 is screwed into the air flotation mounting component 920 and connected to the air flotation block 910.

[0038] In some embodiments of this application, the air flotation mounting component 920 is an air flotation mounting plate, and the air flotation mounting accessory 930 is an air flotation assembly rod. A threaded hole 921 is provided in the air flotation mounting plate, and the air flotation assembly rod is screwed through the threaded hole 921, with its end connected and fixed to the air flotation block 910.

[0039] In some embodiments of this application, a fastening nut 960 is included, which is used to tighten the fastening nut 960 when the air flotation assembly 930 is screwed into place, so as to lock and fix the air flotation assembly 930 by pressing the fastening nut 960 on the air flotation mounting component 920.

[0040] In some embodiments of this application, the floating reading unit includes: The elastic member 940 is connected to the air flotation mounting component 920; The second reading head 220 assembly is mounted on the air flotation mounting component 920.

[0041] After assembling the entire floating reading unit, fix it to the second connecting member 500. Then, ventilate the air flotation block 910 and adjust it to the working air pressure. At this time, an air film is formed between the air flotation block 910 and the second guide rail 200, acting on the air flotation block 910. Then, screw on the air flotation fitting 930 to compress the air flotation block 910. The air flotation block 910 will transmit a reverse force to the air flotation fitting 930 and the elastic member 940 connected to it, causing the elastic member 940 to deform. At the same time, the elastic member 940 provides a reverse elastic preload to the air flotation block 910. This ensures that the air flotation block 910 and the second guide rail 200 can maintain a stable gap range of 7-10μm. At the same time, since the second grating ruler 210 is attached to the second guide rail 200 and the second reading head 220 is fixed to the air flotation mounting component 920, the second reading head 220 assembly supported by the air flotation mounting component 920 will also maintain a stable distance from the second grating ruler 210. The problem of collision between the second reading head 220 and the second grating ruler 210 will not occur due to the poor parallelism of the first guide rail 100 and the second guide rail 200 on the horizontal plane.

[0042] Furthermore, since the air flotation block 910 and the second guide rail 200 are in a non-contact fit, there is no friction between them. This avoids the reading lag caused by friction between the second reading head 220 assembly and the second guide rail 200, thus ensuring the reading accuracy of the second reading head 220.

[0043] In some embodiments of this application, a reading head mounting base 230 is provided with a mounting hole 231, and a second reading head 220 is fixedly connected to the reading head mounting base 230. After the second reading head 220 and the reading head mounting base 230 are fixed, the connection and fixation between the second reading head 220 and the reading head mounting base 230 are achieved.

[0044] The reading head mounting base 230 and the air flotation mounting component 920 are connected by a connecting structure, which includes: A spherical sleeve 951 is used for fitting into the mounting hole 231, and has a notch on its side; The spherical fitting 952 has a spherical part that mates with the spherical sleeve 951; The locking member 953 passes through the spherical fitting 952 and is screwed into the air flotation mounting member 920, having a first position and a second position screwed into the air flotation mounting member 920.

[0045] The locking element 953 is a locking screw that is screwed into the air flotation mounting element 920.

[0046] When the locking member 953 is in the first position, the spherical part of the spherical mating member 952 is located outside the spherical sleeve 951. The spherical sleeve 951 is rotatably disposed in the mounting hole 231. At this time, the reading head mounting base 230 and the second reading head 220 mounted on it can adjust the position such as the rotation angle and the pitch angle through the relative rotation between the mounting hole 231 and the spherical sleeve 951.

[0047] When the locking member 953 is in the second position, the locking member 953 presses the spherical mating member 952 into the spherical sleeve 951, and the spherical part exerts force on the spherical sleeve 951 to tighten it into the mounting hole 231.

[0048] After the reading head mounting base 230 and the second reading head 220 are adjusted into place, the locking member 953 can be continuously screwed in to increase its depth into the air flotation mounting member 920. During the screwing process, the locking member 953 will apply a clamping force to the spherical fitting member 952, pressing the spherical fitting member 952 into the spherical sleeve 951. After being subjected to force, the spherical sleeve 951 is stretched open and tightened and fixed in the mounting hole 231, so as to realize the connection and fixation of the reading head mounting base 230 and the air flotation mounting member 920.

[0049] In some embodiments of this application, the air flotation assembly 930 has a ball socket 931 formed thereon, and the air flotation block 910 has a ball head 911 that cooperates with it. The ball socket 931 and the ball head 911 are inserted into each other. The air flotation block 910 is also provided with a limiting clip 912 to prevent the ball head 911 and the ball socket 931 from separating.

[0050] The limiting locking device 912 is connected to the air flotation block 910. The limiting locking device 912 is hollow inside, and its side has a side opening that extends along the axial direction of the limiting locking device 912. The air flotation device 930 is provided with a locking groove. The ball head 911 is located inside the limiting locking device 912, and a locking protrusion is formed on the inner periphery of the locking opening.

[0051] During assembly, the air flotation assembly is inserted from the side opening and engages with the slot and the protrusion.

[0052] In some embodiments of this application, a limiting member 980 is included to prevent the air flotation block 910 from flipping over. The limiting member is fixed to the air flotation mounting member 920 and includes a bent portion. The bent portion is located above the air flotation block 910 and has a gap with the air flotation block 910.

[0053] The limiting component 980 is a limiting flip plate, which is partially attached to the air flotation mounting component 920 and fixed to the air flotation mounting component 920 by screws. The bent part is a bent wall formed by bending.

[0054] The bent part is located above the air flotation block 910 to prevent the air flotation block 910 from flipping during operation. When the air flotation block 910 flips, the bent part can be locked above it to limit its movement.

[0055] In some embodiments of this application, the elastic member 940 includes: a first member 941 connected to the second connecting member 500; The second component 942 is connected to the air flotation mounting component 920; An elastic element 943 is connected between the first component 941 and the second component 942.

[0056] The first component 941 is the first corner plate, which is connected and fixed to the second connecting component 500.

[0057] The second component 942 is a second connecting plate, and the elastic element 943 is vertically connected between the first component 941 and the second component 942.

[0058] In some embodiments of this application, the elastic element 943 is a hollow spring sheet, and two spring sheets are provided, each of which is connected to the first component 941 and the second component 942 respectively.

[0059] The spring is a hollow rectangular spring, which is fitted to the side of the first component 941 and the second component 942 and is locked and fixed to the first component 941 and the second component 942 by locking screws.

[0060] The spring-loaded structure allows a reverse elastic force to be applied to the air float block 910 when the air float mounting component 920 is screwed on, thus providing the air float block 910 with an elastic clamping force.

[0061] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A coordinate measuring machine, characterized in that, Including: First guide rail; Second guide rail; The crossbeam is connected at both ends to the first connecting member and the second connecting member, respectively. The first air flotation component is assembled on the first connecting member and is arranged at the top and both sides of the first guide rail. The first drive mechanism is assembled on the first connecting member and is used to drive the first connecting member to move the crossbeam. The first grating ruler is mounted on the first guide rail; The first reading head is mounted on the first connecting member and is used to read the first grating ruler. The second air flotation component is disposed on the second connecting member and arranged on the top of the second guide rail; The second grating ruler is mounted on the second guide rail; A floating reading unit, assembled on the second connecting member, includes: Air flotation blocks; Air flotation installation components; The air flotation assembly is screwed into the air flotation mounting component and connected to the air flotation block; An elastic member is connected to the air flotation mounting component; The second reading head is installed on the air flotation mounting component.

2. The coordinate measuring machine according to claim 1, characterized in that, It includes: a reading head mounting base, in which a mounting hole is provided, and the second reading head is fixedly connected to the reading head mounting base.

3. The coordinate measuring machine according to claim 2, characterized in that, The reading head mounting base and the air flotation mounting component are connected by a connecting structure, which includes: A spherical sleeve is used for fitting into the mounting hole; A spherical fitting component having a spherical portion that mates with a spherical sleeve; A locking member, which passes through the spherical fitting and is screwed into the air flotation mounting member, has a first position and a second position screwed into the air flotation mounting member; When the locking member is in the first position, the spherical part of the spherical mating member is located outside the spherical sleeve, and the spherical sleeve is rotatably disposed in the mounting hole; When the locking member is in the second position, the locking member presses the spherical fitting into the spherical sleeve, and the spherical part exerts force on the spherical sleeve to tighten it into the mounting hole.

4. The coordinate measuring machine according to claim 2, characterized in that, The air flotation mounting component is an air flotation mounting plate with a threaded hole on its top, and the air flotation mounting component is screwed into the threaded hole.

5. The coordinate measuring machine according to claim 2, characterized in that, The air flotation assembly has a ball socket, and the air flotation block has a ball head that cooperates with it. The ball socket and the ball head are inserted into each other. The air flotation block is also provided with a limiting clip to prevent the ball head and the ball socket from separating.

6. The coordinate measuring machine according to claim 4, characterized in that, Includes: a fastening nut, used to lock and press onto the air flotation mounting component when it is screwed into place.

7. The coordinate measuring machine according to claim 1, characterized in that, Including: A limiting component for preventing the air flotation block from flipping over is fixed to the air flotation mounting component and includes a bent portion located above the air flotation block and having a gap between the bent portion and the air flotation block.

8. The coordinate measuring machine according to claim 2, characterized in that, The elastic member includes: a first member connected to the second connecting member; The second component is connected to the air flotation mounting component; An elastic element is connected between the first component and the second component.

9. The coordinate measuring machine according to claim 8, characterized in that, The elastic element is a hollow spring sheet, and there are two spring sheets, each of which is connected to the first component and the second component respectively.

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