X-axis driving structure and three-coordinate measuring machine

Abstract

The utility model relates to the field of driving structures for measuring equipment, in particular to an X-axis driving structure and a three-coordinate measuring machine, the X-axis driving structure comprises an X-axis cross beam, the length of the X-axis cross beam extends along the horizontal direction, a sliding seat is arranged on the X-axis cross beam and can do linear motion under the guidance of the X-axis cross beam, and the driving mechanism is provided with an output part used for driving the sliding seat to move. The device further comprises a force transmission piece connected with the output component, the force transmission piece comprises a force transmission piece body and a rolling body, and the force transmission piece is supported on the X-axis cross beam through the rolling body so that the force transmission piece can be driven by the output component to move along the X-axis cross beam to drive the sliding seat to move through the force transmission piece. The rolling body is arranged on the force transmission piece body in a position-adjustable mode, so that it can be guaranteed that the rolling body makes contact with the X-axis cross beam by adjusting the position of the rolling body, good movement straightness of the force transmission piece is guaranteed through the X-axis cross beam, the straightness of the force transmission piece does not need to be guaranteed by arranging a special structure, and cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to drive structure field for measuring equipment, specifically related to a kind of X-axis drive structure and three coordinate measuring machines. BACKGROUND

[0002] Measuring machine generally includes measuring head, motion system and marble platform, measuring head is installed on motion system, and measuring head is driven by motion system to adjust position relative to marble platform. With three coordinate measuring machine as example, the motion system of three coordinate measuring machine includes mutually perpendicular X-axis drive structure, Y-axis drive structure and Z-axis drive structure, and is respectively used to control the position adjustment of measuring head relative to marble platform in X, Y, Z three directions.

[0003] When measuring, the measured workpiece is placed on marble platform, and the position of measuring head is moved to contact with measured workpiece by motion system, the position of contact point when measuring head contacts with workpiece is recorded, and the measurement of measured workpiece is realized. Measuring machine is relatively high in requirement for measuring precision, which also requires that the motion precision of drive structure is relatively high, otherwise it will affect the motion precision of measuring head, and further affect the measuring precision of measuring machine. CONTENT OF UTILITY MODEL

[0004] The utility model solves the technical problem of how to avoid the influence of the motion precision of X-axis drive structure on the measuring precision of three coordinate measuring machine.

[0005] In the first aspect, the X-axis drive structure provided by the utility model comprises:

[0006] X-axis beam, length extends along horizontal direction;

[0007] Slide, installed on the X-axis beam, and can do linear motion under the guidance of the X-axis beam;

[0008] Driving mechanism, with output component for driving the motion of the slide;

[0009] And the force transmission piece connected with the output component, the force transmission piece includes force transmission piece main body and rolling body, the force transmission piece is supported on the X-axis beam through the rolling body, so that the force transmission piece can move along the X-axis beam under the drive of the output component, to drive the motion of the slide through the force transmission piece, the rolling body is adjustably arranged on the force transmission piece main body, so as to be able to ensure that the rolling body contacts with the X-axis beam by adjusting the position of the rolling body.

[0010] In one technical solution, the output component is a lead screw, which is circumferentially rotatable but axially fixed relative to the X-axis beam. The force transmission component has a threaded structure that mates with the lead screw. The force transmission component is supported on the X-axis beam and constrained by the X-axis beam, thereby preventing the force transmission component from rotating with the lead screw.

[0011] In one technical solution, the rolling element is mounted on the force transmission component body via a wheel axle. The wheel axle has a rotating shaft section and a mounting section. The rolling element is rotatably mounted on the rotating shaft section, and the mounting section is rotatably disposed on the force transmission component body. The axes of the rotating shaft section and the mounting section are parallel and do not coincide, so that the position of the rolling element can be adjusted by rotating the mounting section.

[0012] In one technical solution, the axle has a force-applying structure for cooperating with a tool, so that the tool can drive the mounting section to rotate and adjust the position of the rolling element.

[0013] In one technical solution, the force transmission component body includes two spaced-apart vertical walls, at least two rolling elements are arranged between the two vertical walls, and each rolling element is alternately arranged on the two vertical walls along the length of the X-axis beam. The force-applying structure is located at the end of the shaft section away from the mounting section. Each vertical wall is provided with an adjustment hole, which is aligned with the force-applying structure on the wheel axle on the opposite vertical wall. The adjustment hole is used for the tool to pass through.

[0014] In one technical solution, the force transmission component includes two vertical walls arranged at intervals, the rolling element is located between the two vertical walls, and the lead screw passes through the two vertical walls and is located on the side of the rolling element facing away from the X-axis beam.

[0015] In one technical solution, the force transmission component is flexibly coupled with the slide block to reduce the force exerted by the force transmission component on the slide block in the non-moving direction, where the non-moving direction is a direction other than the moving direction of the slide block.

[0016] In one technical solution, one of the force transmission component and the slide includes a mating protrusion and the other includes a mating cavity. The component with the mating cavity is defined as the mating cavity component. The mating protrusion is inserted into the mating cavity. When the force transmission component moves, the mating protrusion only contacts the mating cavity component in the moving direction of the slide to transmit force, so as to realize the flexible transmission cooperation between the force transmission component and the slide.

[0017] In one technical solution, one of the mating protrusion and the mating cavity has a protruding structure protruding towards the other, and the other has a flat surface that abuts against the protruding structure to form a point contact between the mating protrusion and the mating cavity.

[0018] Secondly, this utility model provides a coordinate measuring machine, which includes a measuring platform, a probe, and a motion system. The measuring platform is used to carry the workpiece to be measured. The probe is mounted on the motion system so that the motion system drives the probe to move relative to the measuring platform. The motion system includes an X-axis drive structure, which adopts the X-axis drive structure mentioned in the first aspect above, so that the probe is moved by the slide.

[0019] The beneficial effects of this utility model are as follows:

[0020] In the X-axis drive structure of the coordinate measuring machine of this invention, the force transmission component is supported on the X-axis crossbeam, allowing the force transmission component to move along the X-axis crossbeam. The X-axis crossbeam itself has high machining precision and very high straightness, thus ensuring that the movement path of the force transmission component has very high straightness, ensuring the motion accuracy of the X-axis drive structure, and preventing the X-axis drive structure from affecting the measurement accuracy of the coordinate measuring machine. By using the X-axis crossbeam to ensure the straightness of the force transmission component's movement, there is no need to set up a special guide structure for the force transmission component, which can reduce the manufacturing cost of the X-axis drive structure. The force transmission component is supported on the X-axis crossbeam by rolling elements, so that the friction between the force transmission component and the X-axis crossbeam is rolling friction, ensuring smooth and stable movement of the force transmission component. Furthermore, the reliable contact between the rolling elements and the X-axis crossbeam can be ensured by adjusting the position of the rolling elements. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of one embodiment of the coordinate measuring machine of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the X-axis slide and the X-axis crossbeam in one embodiment of the coordinate measuring machine of this utility model;

[0023] Figure 3 This is a schematic diagram of the drive mechanism between the X-axis slide and the X-axis crossbeam in one embodiment of the coordinate measuring machine of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the force transmission component and the moving block cooperating in one embodiment of the coordinate measuring machine of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the rolling element and the wheel axle in one embodiment of the coordinate measuring machine of this utility model;

[0026] Figure 6 This is a cross-sectional view of the mating protrusion and the mating cavity in one embodiment of the coordinate measuring machine of this utility model.

[0027] List of feature names corresponding to the labels in the figure:

[0028] 1. Measurement platform;

[0029] 2. Motion System; 21. X-axis Crossbeam; 22. X-axis Slide; 221. Moving Frame; 222. Moving Block; 2221. Insertion Cavity; 2222. First Ball; 2223. Elastic Component; 2224. Second Ball; 2225. Plug; 23. Air Float; 24. Lead Screw; 25. Force Transmission Component; 251. Force Transmission Component Body; 2511. Vertical Wall; 2512. Adjustment Hole; 252. Rolling Element; 253. Rotating Shaft Section; 2531. Internal Hexagonal Hole; 254. Mounting Section; 255. Locking Nut; 256. Insert Plate; 2561. Insertion Protrusion; 26. Drive Wheel;

[0030] 3. Probe. Detailed Implementation

[0031] The present application will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0032] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0033] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0034] In the embodiments of this utility model, the force transmission component of the coordinate measuring machine is flexibly coupled with the slide, so that when the motion accuracy of the force transmission component changes, it will not have or will have a minimal impact on the motion accuracy of the slide. At the same time, the force transmission component is supported on the X-axis beam, which itself has a very high degree of straightness. Thus, when the output component of the drive mechanism drives the force transmission component to move, the force transmission component can move linearly along the X-axis beam. From the perspective of the motion accuracy of the force transmission component itself, the slide of the X-axis drive structure is guaranteed to have a very high motion accuracy, thereby ensuring that the coordinate measuring machine has reliable measurement accuracy.

[0035] An embodiment of the coordinate measuring machine in this utility model:

[0036] In one embodiment, please refer to Figure 1 A coordinate measuring machine (CMM) includes a measuring platform 1, a motion system 2, and a probe 3. The probe 3 is mounted on the motion system 2, which drives the probe 3 to move relative to the measuring platform 1, thereby measuring a workpiece placed on the measuring platform 1. Specific forms of CMMs include, but are not limited to, moving bridge CMMs, gantry CMMs, fixed bridge CMMs, and cantilever CMMs.

[0037] As described above, the measuring platform 1 is used to support the workpiece being measured. The measurement accuracy of a coordinate measuring machine is often at the micrometer level; therefore, the table surface of the measuring platform 1 needs to have a very high flatness. Those skilled in the art will understand and know the material requirements for the measuring platform 1. It is necessary to ensure that the measuring platform 1 can provide a highly flat and non-deformable supporting surface for the workpiece being measured. Therefore, marble can be used to manufacture the measuring platform 1. In other embodiments, granite, cast iron, etc., can also be used to make the measuring platform 1.

[0038] The motion system 2 is used to realize the three-dimensional movement of the probe 3, including an X-axis drive structure, a Y-axis drive structure and a Z-axis drive structure. In the three-dimensional coordinate system, the X-axis, Y-axis and Z-axis are mutually perpendicular. The X-axis direction and the Y-axis direction are two mutually perpendicular horizontal directions, and the Z-axis direction is a vertical direction. Therefore, the X-axis drive structure and the Y-axis drive structure are both horizontal drive structures, which are used to drive the probe 3 to move in the X-axis direction and the Y-axis direction, respectively. The Z-axis drive structure is a vertical drive structure, which is used to adjust the height of the probe 3 relative to the measuring platform 1.

[0039] Please refer to Figure 2 The X-axis drive structure includes an X-axis crossbeam 21, which is a straight beam extending along the X-axis direction. The X-axis drive structure also includes a slide mounted on the X-axis crossbeam 21, specifically an X-axis slide 22. The X-axis slide 22 is mounted on the X-axis crossbeam 21 through a guide structure, so that the X-axis slide 22 can move linearly under the guidance of the X-axis crossbeam 21.

[0040] Please refer to Figure 2 In one embodiment, the X-axis beam 21 has a rectangular cross-section and a flat upper beam surface. To ensure the measurement accuracy of the coordinate measuring machine, the X-axis beam 21 needs to have a stable shape, that is, it still has a very high flatness after long-term use. Therefore, the X-axis beam 21 is made of marble. Similarly, referring to the similar technical requirements of the measurement platform 1, those skilled in the art can understand that the X-axis beam 21 can also be made of granite, cast iron, etc.

[0041] The X-axis slide 22 is a rectangular frame structure slide, which is fitted onto the X-axis beam 21. Since both the slide and the X-axis beam 21 are rectangular, rotation of the slide around the X-axis beam 21 is prevented. For the insert-fit X-axis slide and X-axis beam, in other embodiments, the cross-sections of the X-axis slide and X-axis beam can also be other shapes, such as triangles or pentagons, as long as the X-axis slide is non-rotatably mounted on the X-axis beam. In one embodiment, the guide structure for mounting the X-axis slide on the X-axis beam is a plurality of air floats 23 disposed inside the slide.

[0042] The X-axis slide 22 is designed to provide a mounting base for the Z-axis drive structure and drive the Z-axis drive structure to move along the X-axis. Based on this, those skilled in the art will know that the structure of the X-axis slide 22 can be other structures, as long as they can meet the requirements for the Z-axis drive structure to be mounted on the X-axis slide. For example, the X-axis slide can also be a block structure. For the guide structure, a dovetail-shaped guide rail extending along the length of the X-axis beam 21 can be provided on the X-axis beam 21. A dovetail groove can be provided on the block structure X-axis slide. The X-axis slide can be mounted on the X-axis beam by the cooperation of the dovetail groove and the dovetail-shaped guide rail, and the X-axis slide can move linearly under the guidance of the X-axis beam.

[0043] In one embodiment, the driving mechanism for moving the X-axis slide 22 along the X-axis beam 21 is a lead screw and nut driving mechanism. Please refer to [reference needed]. Figure 3 and Figure 4 The lead screw and nut drive mechanism includes a lead screw 24 and a force transmission component 25 with a threaded structure. The lead screw 24 serves as the output component of the drive mechanism.

[0044] The two ends of the lead screw 24 are mounted on the upper beam surface of the X-axis beam 21 via bearings and bearing housings, allowing the lead screw 24 to rotate circumferentially relative to the X-axis beam 21, but fixed axially relative to the X-axis beam 21. A drive wheel 26 is provided at one end of the lead screw 24. The drive wheel 26 can be a pulley, sprocket, or gear, etc., and is driven to rotate by a power device such as a motor, thus realizing the rotation of the lead screw 24. The specific form of the lead screw nut drive mechanism can be, but is not limited to, a ball screw mechanism, a sliding screw mechanism, a synchronous belt screw mechanism, or a gear screw mechanism.

[0045] The force transmission component 25 has a threaded structure that mates with the lead screw 24. The force transmission component 25 is also supported on the upper beam surface of the X-axis beam 21 and is anti-rotationally engaged with the X-axis beam 21. In this way, the force transmission component 25 can be constrained by the X-axis beam 21 to prevent the force transmission component 25 from rotating with the lead screw 24. When the nut and lead screw mechanism is working, it converts the rotational motion of the lead screw 24 into the linear motion of the force transmission component 25.

[0046] For the connection method between the force transmission component 25 and the X-axis beam 21, please refer to [reference needed]. Figure 3 and Figure 4 The force transmission component 25 includes a force transmission component body 251 and a rolling element 252. The threaded structure of the force transmission component 25 for cooperating with the lead screw 24 is provided on the force transmission component body 251, and the rolling element 252 is rotatably provided on the force transmission component body 251. The force transmission component 25 is supported by the X-axis beam 21 through the rolling element 252, which avoids the sliding friction contact between the force transmission component 25 and the X-axis beam 21, thus avoiding the smoothness of the movement of the force transmission component 25. It also avoids the sliding wear between the force transmission component 25 and the X-axis beam 21, which would affect the measurement accuracy of the coordinate measuring machine.

[0047] Because the upper surface of the X-axis beam 21 has high flatness, the force transmission component 25 ensures a very high degree of straightness in its movement path when it moves along the upper surface of the X-axis beam 21, thereby ensuring the measurement accuracy of the coordinate measuring machine. Simultaneously, by directly utilizing the upper surface of the X-axis beam 21 to constrain the force transmission component 25 and prevent its rotation, there is no need to specifically design a guide rail to prevent the force transmission component 25 from rotating. This effectively reduces the manufacturing cost of the X-axis drive structure, thereby reducing the production cost of the coordinate measuring machine. Regarding the structural form of the rolling element 252, in one embodiment, the rolling element 252 is specifically a roller with a defined axis of rotation; in other embodiments, the rolling element 252 can also be a omnidirectional ball, also known as a bullseye wheel.

[0048] To ensure that the rolling element remains in close contact with the X-axis beam 21, in one embodiment, the rolling element 252 is adjustablely positioned on the force transmission body 251, allowing the rolling element 252 to be adjusted to move closer to or further away from the X-axis beam 21. For details, please refer to... Figure 4and Figure 5 A rolling element 252 in the form of a roller is mounted on the force transmission component body 251 via an axle. The axle includes a rotating shaft section 253 and a mounting section 254. The rolling element 252 is rotatably mounted on the rotating shaft section 253. The mounting section 254 is used to rotatably mount itself within a mounting hole opened in the force transmission component body 251. A locking nut 255 is threaded onto the mounting section 254. By tightening the locking nut 255, the force transmission component body 251 is pressed together, thus achieving a fixed installation of the mounting section 254 on the force transmission component body 251. The axes of the rotating shaft section 253 and the mounting section 254 are parallel but not coincident. Therefore, by rotating the mounting section 254, the axial position of the rotating shaft section 253 can be adjusted, thereby adjusting the position of the rolling element 252.

[0049] During assembly, the main body 251 of the force transmission component and the lead screw 24 can be installed on the surface of the X-axis beam 21 first. Then, the mounting section 254 is inserted into the mounting hole on the main body 251 of the force transmission component, but the locking nut 255 is not tightened. After the rolling element 252 is adjusted to contact the upper beam surface of the X-axis beam 21, the locking nut 255 is tightened.

[0050] Regarding the adjustable mounting method of the rolling element 252 on the force transmission component body 251, in other embodiments, an adjustment elongated hole can be provided on the force transmission component body 251 as a mounting hole for the wheel axle. The length direction of the adjustment elongated hole extends away from the X-axis beam 21. In this case, the shaft section 253 and the mounting section 254 can be coaxial. The position of the roller can be adjusted by changing the position of the mounting section 254 within the adjustment elongated hole. However, it should be emphasized that in order to ensure that the rolling element 252 can reliably maintain its position after the position adjustment is completed, the locking nut 255 needs to have a larger and more stable locking force. Specifically, two nuts can be provided on the mounting section 254, one as the locking nut 255 and the other as a backup nut, to prevent the locking nut 255 from loosening. For omnidirectional ball-type rolling elements, their wheel seats are generally fixed to the force transmission component body 251 with screws. The position of the rolling element can be adjusted by placing shims of different thicknesses between the wheel seat and the force transmission component body 251.

[0051] To facilitate the rotation of the mounting section 254 to adjust the position of the rolling elements, a force-applying structure that cooperates with a tool is provided on the axle. This force-applying structure can be an internal hexagonal hole on the end face of the axle, in which case a hexagonal wrench is used. Alternatively, the force-applying structure can be a square or hexagonal head on the end of the axle, in which case an open-end wrench, adjustable wrench, or socket wrench can be used. Alternatively, a radially penetrating force-applying hole can be provided on the mounting section of the axle as the force-applying structure, in which case a rigid rod can be used. During operation, the rigid rod is inserted into the force-applying hole, and the mounting section 254 is driven to rotate by turning the rigid rod. The rotation center of the force-applying structure coincides with the axis of the mounting section 254. Those skilled in the art will understand that the force-applying structure is not limited to the above-mentioned types and can be any structure suitable for this application in the prior art.

[0052] In one embodiment, please refer to Figure 4 The force transmission component body 251 includes two vertical walls 2511 arranged at left and right intervals. Multiple rolling elements are arranged between the two vertical walls 2511. The end face of the rotating shaft section 253 of each wheel axle is provided with an internal hexagonal hole 2531 as a force application structure. To facilitate the cooperation between the tool and the force application structure, multiple rolling elements 252 are alternately arranged on the two vertical walls 2511 along the length of the X-axis beam 21. That is, the first rolling element 252 is arranged on the left vertical wall 2511, the second rolling element 252 is arranged on the right vertical wall 2511, and so on. At the same time, an adjustment hole 2512 is opened on any vertical wall 2511 to align with the internal hexagonal hole 2531 on the wheel axle of the opposite vertical wall 2511. This allows the tool to pass through the adjustment hole 2512 on the vertical wall 2511 to reach the position where it mates with the internal hexagonal hole 2531.

[0053] Regarding the number of rolling elements, one embodiment uses two, while in other embodiments, the minimum is one, and there can be more than two, such as three or four. The more rolling elements there are, the smoother the movement of the force transmission component 25, but this also leads to more complex assembly work and increased manufacturing costs for the X-axis drive structure. As for the installation method of the rolling elements, they can also be rotatably installed in the middle position of the wheel axle, i.e., the middle section of the wheel axle is the rotating section, and the two sections on either side of the rotating section are the mounting sections. The two mounting sections of each wheel axle are fitted with the two vertical walls.

[0054] To ensure a compact structure and balanced force distribution on the force transmission element 25, the lead screw 24 passes between the two vertical walls 2511 and is located on the side of the rolling element facing away from the X-axis beam 21. In other embodiments, the threaded structure of the force transmission element 25 and the lead screw 24 can be provided on the side of the two vertical walls 2511 away from the X-axis beam 21, so that the lead screw 24 passes through the force transmission element 25 from the side of the two vertical walls away from the X-axis beam 21.

[0055] In other embodiments, the drive mechanism can be a belt drive, synchronous belt drive, chain drive, or other transmission structures. Taking belt drive as an example, the belt constitutes the output component of the drive mechanism, and the force transmission component is connected to the belt and moves under the belt.

[0056] The force transmission component 25 and the X-axis slide 22 are connected by a flexible transmission mechanism. This "flexible transmission mechanism" refers to a non-rigid connection between the force transmission component 25 and the X-axis slide 22, and does not specifically refer to a connection via a flexible component. This flexible transmission mechanism allows the force transmission component 25 to stably apply force to the X-axis slide 22 along the length extension direction of the X-axis beam 21, reducing the force applied by the force transmission component 25 to the X-axis slide 22 in directions other than the length extension direction of the X-axis beam 21. The length extension direction of the X-axis beam 21 is the direction of movement of the X-axis slide 22. In other words, it reduces the force applied by the force transmission component 25 to the X-axis slide 22 in non-moving directions, which are directions other than the moving direction of the X-axis slide 22. The reduction mentioned here refers to the reduction in force applied by the force transmission component 25 in these non-moving directions. Compared to the rigid transmission connection between the force transmission component 25 and the X-axis slide 22, this method allows the force transmission component 25 to exert less or even no force on the X-axis slide 22 in the non-moving direction. Therefore, even if the straightness of the movement trajectory of the force transmission component 25 changes or the force transmission component 25 vibrates (e.g., the lead screw 24 deforms and develops curvature after long-term use), the impact on the straightness of the X-axis slide 22's movement can be reduced or avoided. Thus, compared to existing transmission methods, this method effectively improves the straightness of the X-axis slide 22's movement. Of course, in some other embodiments, the force transmission component 25 and the X-axis slide 22 can also be rigidly connected.

[0057] In one form of flexible transmission, specifically, one of the force transmission component 25 and the X-axis slide 22 includes a mating protrusion and the other includes a mating cavity. The component with the mating cavity is defined as the mating cavity component. The mating protrusion is mated in the mating cavity. In the length extension direction of the X-axis beam 21, the mating protrusion and the mating cavity component are in contact and mated. They are not in contact in other directions, so that the mating protrusion only applies force to the mating cavity component in the length extension direction of the X-axis beam 21.

[0058] Please refer to Figure 4 and Figure 6 In one embodiment, the force transmission component 25 includes an insert plate 256 detachably connected to the force transmission component body 251. The insert plate 256 is an L-shaped plate, with one flange connected to the force transmission component body 251 by screws, and the other flange having a notch in the middle to form two spaced-apart insertion protrusions 2561. In other embodiments, the force transmission component body and the insert plate can also be integrally formed.

[0059] The X-axis slide block 22 includes a movable frame 221 and a movable block 222 connected to the movable frame 221. The movable block 222 is a mating cavity component with two mating cavities 2221 spaced apart on its left and right sides. The left mating cavity 2221 has open sides on its left, top, and bottom, while the right mating cavity 2221 has open sides on its right, top, and bottom. Two mating protrusions 2561 are mated to the two mating cavities 2221 in a one-to-one correspondence. In other embodiments, the movable frame and the movable block can be integrally formed.

[0060] Please refer to Figure 6 Taking one of the fitting cavities 2221 as an example, a through hole is provided on one side of the movable block 222 located in the fitting cavity 2221. A first ball 2222 is fixed in the through hole. A portion of the first ball 2222 protrudes from the cavity wall on this side of the fitting cavity 2221 to form a protrusion structure protruding towards the fitting protrusion 2561. A through hole is also provided on the other side of the movable block 2221 located in the fitting cavity 2221. An elastic element 2223 is provided in the through hole. A second ball 2224 is provided at the opening of the through hole towards the fitting protrusion 2561, i.e., at one end of the elastic element 2223. The position of the second ball 2224 can float elastically. A portion of the second ball 2224 protrudes towards the fitting protrusion 2561 to form a protrusion structure.

[0061] A plug 2225 is provided at the other end of the through hole. Thus, by pushing the elastic element 2223, the first ball 2222 and the second ball 2224 can elastically clamp the mating protrusion 2561. By changing the amount of screwing in the plug 2225, the elastic force of the elastic element 2223 can be changed. The elastic element 2223 can be a compression spring, a disc spring, a rubber block, etc.

[0062] The mating protrusion 2561 has a flat surface that abuts against the protruding structure, thus forming a point contact between the mating protrusion 2561 and the moving block 222. The flat surface on the mating protrusion 2561 ensures stable and reliable force transmission between the force transmission member 25 and the moving block 222 in the moving direction of the X-axis slide 22. At the same time, the point contact results in a small contact area, making it easy for the force transmission member 25 and the moving block 222 to slide relative to each other. When the movement path of the force transmission member 25 changes, the influence on the straightness of the movement of the moving block 222 is reduced or eliminated. In other embodiments, the protruding structure can also be a pyramidal protrusion provided on either the mating protrusion or the moving block.

[0063] The above structural forms describe some forms in which a protruding structure is provided on one of the mating protrusion and the moving block, and a plane that abuts and engages with the protruding structure is provided on the other. For the form in which a protruding structure is provided on one of the mating protrusion and the moving block, and a plane that abuts and engages with the protruding structure is provided on the other, it can also be that a protruding structure is provided on the mating protrusion, and a plane that abuts and engages with the protruding structure on the mating protrusion is provided on the moving block; simultaneously, a protruding structure is provided on the moving block, and a plane that abuts and engages with the protruding structure on the mating protrusion is provided on the moving block.

[0064] In other embodiments, the force transmission component and the X-axis slide can be connected by only one set of mating protrusions and mating cavities. Of course, they can also be connected by three or more sets of mating protrusions and mating cavities.

[0065] In other embodiments, the flexible fit between the force transmission component and the slide can also be a different structure, such as connecting a connecting component between the force transmission component and the slide. The connecting component is a rod, the length of which extends along the movement direction of the slide. Notches are provided on the outer periphery of the rod at intervals and alternately on the left and right sides along the length of the rod, so that the rod can rigidly transmit force in the movement direction of the slide and deform in the movement direction perpendicular to the slide. This allows the force transmission component and the slide to transmit force only in the extension direction of the slide.

[0066] This utility model also provides an X-axis drive structure, which is the same as the X-axis drive structure in the various embodiments of the coordinate measuring machine described above, and will not be described again here.

[0067] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. An X-axis drive structure characterized by comprising: The application relates to a linear motion mechanism, comprising: an X-axis beam extending along a horizontal direction; a slide mounted on the X-axis beam and capable of moving linearly under the guidance of the X-axis beam; a driving mechanism having an output component for driving the slide to move; a force transmission member connected with the output component, the force transmission member comprising a force transmission member body and a rolling body, the force transmission member is supported on the X-axis beam through the rolling body, so that the force transmission member can move along the X-axis beam under the driving of the output component to drive the slide to move, the position of the rolling body is adjustably arranged on the force transmission member body, so that the contact between the rolling body and the X-axis beam can be ensured by adjusting the position of the rolling body.

2. The X-axis drive structure of claim 1, wherein, The output component is a screw rod, the screw rod is arranged in a circumferential rotating manner but in an axial fixed manner relative to the X-axis beam, the force transmission member has a thread structure matched with the screw rod, the force transmission member is supported on the X-axis beam and is constrained by the X-axis beam, so that the force transmission member is prevented from rotating with the screw rod.

3. The X-axis drive structure according to claim 1 or 2, wherein The rolling body is mounted on the force transmission member body through an axle, the axle has a rotating shaft section and a mounting section, the rolling body is rotatably mounted on the rotating shaft section, the mounting section is rotatably arranged on the force transmission member body, the axes of the rotating shaft section and the mounting section are parallel and do not coincide, so that the position of the rolling body can be adjusted by rotating the mounting section.

4. The X-axis drive structure of claim 3, wherein The axle has a force applying structure matched with a tool, so that the mounting section can be driven to rotate by the tool to adjust the position of the rolling body.

5. The X-axis drive structure of claim 4, wherein The force transmission member body comprises two stand walls arranged at intervals, at least two rolling bodies are arranged between the two stand walls, each rolling body is alternately arranged on the two stand walls along the direction in which the X-axis beam extends, the force applying structure is arranged at the end of the rotating shaft section away from the mounting section, each stand wall is provided with an adjusting hole, the adjusting hole is aligned with the force applying structure on the axle of the opposite stand wall, and the adjusting hole is used for the tool to pass through.

6. The X-axis drive structure of claim 2, wherein The force transmission member comprises two stand walls arranged at intervals, the rolling body is located between the two stand walls, and the screw rod passes through the two stand walls and is located on the side of the rolling body away from the X-axis beam.

7. The X-axis drive structure according to claim 1 or 2, wherein The force transmission member is flexibly connected with the slide to reduce the force applied by the force transmission member to the slide in a non-moving direction, the non-moving direction is a direction other than the moving direction of the slide.

8. The X-axis drive structure of claim 7, wherein One of the force transmission member and the slide comprises a plug-in convex part, the other comprises a plug-in cavity, one defining a plug-in cavity member is provided with the plug-in cavity, the plug-in convex part is plugged into the plug-in cavity, and when the force transmission member moves, the plug-in convex part only contacts the plug-in cavity member in the moving direction of the slide to realize the flexible connection between the force transmission member and the slide.

9. The X-axis drive structure of claim 8, wherein, One of the plug-in convex part and the plug-in cavity member has a convex structure protruding towards the other, and the other has a plane matched with the convex structure to form a point contact between the plug-in convex part and the plug-in cavity member.

10. A coordinate measuring machine comprising a measuring stage for carrying a workpiece under test, a probe head mounted on a motion system for driving the probe head in relation to the measuring stage, characterised in that, The motion system comprises an X-axis drive structure, which is the X-axis drive structure as claimed in any one of claims 1-9, to move the probe with the slide.

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