Anti-backlash transmission mechanism for three-coordinate measuring machine and three-coordinate measuring machine

Abstract

The present application provides an anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine and a three-dimensional coordinate measuring machine. The transmission mechanism includes a synchronous pulley, a synchronous belt, a driving member, a first rotating shaft, a reduction assembly, an anti-backlash assembly, and an adjustment assembly. The anti-backlash assembly is used to drive the first rotating shaft to move toward the synchronous belt, thereby driving the synchronous pulley to move toward the synchronous belt, thereby eliminating the meshing gap between the synchronous pulley and the synchronous belt; the movement of the first rotating shaft toward the synchronous belt drives the first secondary pulley to move relative to the first main pulley, and the adjustment assembly is used to adaptively adjust the tightness of the first transmission belt so that the first transmission belt is tensioned between the first main pulley and the first secondary pulley. The addition of the adjustment assembly to the transmission mechanism of the present application can make the first transmission belt always in a suitable stress state, improve the transmission stability between the synchronous pulley and the driving member, and thus improve the stability of the transmission mechanism driving the probe movement.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring instruments, and in particular to an anti-backlash transmission mechanism for a three-coordinate measuring machine and the three-coordinate measuring machine. Background Art

[0002] A three-dimensional coordinate measuring machine (CMM), also known as a three-dimensional coordinate measuring instrument or three-dimensional coordinate measuring bed, consists of a backlash-eliminating mechanism and a stylus. The backlash-eliminating mechanism moves the stylus along three perpendicular axes (X, Y, and Z). During measurement, a workpiece is placed on a marble platform. The backlash-eliminating mechanism controls the stylus' contact with the workpiece, recording the contact point between the stylus and the workpiece to measure the workpiece.

[0003] The anti-backlash transmission mechanism typically includes a meshing synchronous belt and synchronous pulley. The drive motor drives the synchronous pulley to rotate, changing its position on the belt and thus controlling the movement of the probe. However, backlash is prone to occur between the synchronous pulley and the belt, causing position errors after the synchronous pulley changes direction. After the anti-backlash component is used to eliminate the backlash, the addition of the anti-backlash component will cause the position of the synchronous pulley to change, resulting in an impact on the final reduction of the reduction mechanism. For example, the final reduction belt may become loose or disconnected. Although the use of an elastic transmission belt can alleviate some of the impact, there is still a risk that the transmission between the synchronous pulley and the drive motor will be unstable, resulting in unstable movement of the probe. Summary of the Invention

[0004] The main technical problem solved by the present invention is the problem that the transmission between the synchronous pulley and the drive motor is unstable due to the addition of an anti-backlash component to the anti-backlash transmission mechanism.

[0005] In order to solve the above technical problems, the present application provides an anti-backlash transmission mechanism for a three-coordinate measuring machine. The anti-backlash transmission mechanism for a three-coordinate measuring machine includes a driving member, a first rotating shaft, a synchronous pulley, a synchronous belt, a deceleration assembly, an anti-backlash assembly and an adjustment assembly. The driving member has an output shaft; the synchronous belt is meshed with the synchronous pulley, and the synchronous pulley can reciprocate on the synchronous belt; the reduction assembly is arranged between the output shaft and the first rotating shaft, the reduction assembly includes at least one reduction transmission pair, and one of the reduction transmission pairs is a final reduction transmission pair. The final reduction transmission pair includes a first main pulley, a first secondary pulley and a first transmission belt, the first main pulley and the first secondary pulley are connected to the first secondary pulley through the first transmission belt, and the first secondary pulley is connected to the synchronous pulley through the first rotating shaft; the gap eliminating assembly is used to drive the first rotating shaft toward the synchronous belt to drive the synchronous belt to move toward the synchronous belt to eliminate the meshing gap between the synchronous belt pulley and the synchronous belt; the movement of the first rotating shaft toward the synchronous belt drives the first secondary pulley to move relative to the first main pulley, and the adjustment assembly is used to adaptively adjust the tightness of the first transmission belt so that the first transmission belt is tensionedly sleeved between the first main pulley and the first secondary pulley.

[0006] In one embodiment, the anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine also includes a fixed plate, the fixed plate having a first side and a second side relative to each other, the output shaft and the first rotating shaft are both rotatably connected to the fixed plate, the synchronous pulley is arranged on the first side of the fixed plate, and at least part of the anti-backlash assembly, the deceleration assembly and the adjustment assembly are arranged on the second side of the fixed plate.

[0007] In one embodiment, the adjustment component has an elastic restoring force, and under the action of the elastic restoring force, the adjustment component applies force to the first transmission belt to adaptively adjust the loop shape of the first transmission belt.

[0008] In one embodiment, the adjustment assembly includes a first main body, a sliding assembly and a first elastic member. The first main body is fixed on a fixed plate. A first sliding track is provided in the first main body. One end of the sliding assembly is slidably connected to the first sliding track. The other end of the sliding assembly abuts against the inner side surface of the first transmission belt. The first elastic member connects the first main body and the sliding assembly.

[0009] In one embodiment, the sliding assembly includes a sliding member and a roller, one end of the sliding member is slidingly connected to the first sliding track, and the other end is rotationally connected to the roller; the roller abuts against the inner side surface of the first transmission belt.

[0010] In one embodiment, the first main body is located outside the first transmission belt, and the first elastic member is a spring. The spring has an elastic restoring force capable of causing the sliding assembly to retract toward the inside of the first main body.

[0011] In one embodiment, the anti-backlash assembly includes an eccentric bearing, a fixing member and an elastic member. The eccentric bearing is rotatably mounted on the first rotating shaft, and the eccentric bearing is mounted on a fixed plate. The fixing member is fixedly connected to the eccentric bearing, and the elastic member abuts the fixing member. The elastic member is used to push the fixing member to rotate to drive the first rotating shaft to move toward the synchronous belt.

[0012] In one embodiment, the elastic assembly includes a second main body, an abutting member, and a second elastic member. The second main body is fixed to the fixed plate. A second sliding track is provided in the second main body. The abutting member is slidably connected to the second sliding track. The second elastic member connects the second main body and the abutting member. The abutting member abuts against the fixed member under the action of the second elastic member.

[0013] In one embodiment, the fixing member includes a fixing buckle and a baffle. The fixing buckle is an arc-shaped structure. The fixing buckle is sleeved on the eccentric bearing. A part of the baffle structure is fixedly connected to the fixing buckle, and another part of the baffle structure extends out of the notch to abut against the elastic component.

[0014] In one embodiment, the reduction assembly includes two reduction transmission pairs, and one of the reduction transmission pairs is a primary reduction transmission pair, the primary reduction transmission pair includes a second main pulley, a second secondary pulley and a second transmission belt; the anti-backlash transmission mechanism for the three-coordinate measuring machine also includes a second rotating shaft, the second rotating shaft is rotatably connected to the fixed plate, the first main pulley and the second secondary pulley are arranged on the second rotating shaft, the second main pulley is arranged on the output shaft, and the second main pulley and the second secondary pulley are connected through the second transmission belt.

[0015] To address the aforementioned technical issues, the present application provides a three-dimensional coordinate measuring machine (CMM), comprising a stylus for measuring a workpiece and an anti-backlash transmission mechanism. The stylus is used to measure a workpiece; the anti-backlash transmission mechanism is any of the aforementioned embodiments for use in a CMM, and is used to drive the stylus.

[0016] In the anti-backlash transmission mechanism of the present application, when the tension of the first transmission belt is appropriate, the first transmission belt will be tensioned between the first main pulley and the first secondary pulley. When the anti-backlash assembly eliminates backlash, the first secondary pulley will move relative to the first main pulley, causing the first transmission belt to be tightened or loosened. The adjustment assembly can adjust the tightness of the first transmission belt. When the first transmission belt is relatively loose, it may become loose, but the adjustment assembly can appropriately tighten the first transmission belt, placing the first transmission belt in a suitable stress state. When the first transmission belt is relatively tight, it may become disconnected, but the adjustment assembly can appropriately loosen the first transmission belt, placing the first transmission belt in a suitable stress state. Therefore, the addition of the adjustment assembly to the anti-backlash transmission mechanism of the present application can keep the first transmission belt in a constantly appropriate stress state, prevent the first transmission belt from becoming loose or disconnected, improve the transmission stability between the synchronous pulley and the drive member, and thus improve the motion stability of the probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a workbench, a column, and a backlash-eliminating transmission mechanism provided in one embodiment of the present application;

[0018] Figure 2 A schematic structural diagram of a synchronous pulley, a driving member, a reduction assembly, an anti-backlash assembly, an adjustment assembly, and a fixing plate provided in one embodiment of the present application;

[0019] Figure 3 for Figure 2 A structural diagram from another perspective;

[0020] Figure 4 for Figure 3 Schematic diagram of the structure without the second pulley and the second transmission belt;

[0021] Figure 5 for Figure 2 A structural diagram from another perspective;

[0022] Figure 6 A cross-sectional view of an adjustment assembly provided in one embodiment of the present application;

[0023] Figure 7 A cross-sectional view of an adjustment assembly provided in another embodiment of the present application;

[0024] Figure 8 A schematic structural diagram of a synchronous pulley, a first secondary pulley, a fixing member, and an eccentric bearing provided in one embodiment of the present application;

[0025] Figure 9 A schematic structural diagram of an eccentric bearing provided in one embodiment of the present application;

[0026] Figure 10 for Figure 3 A partial enlarged view of

[0027] Figure 11 for Figure 10 A partial cross-sectional view of .

[0028] Reference numerals: workbench 10, guide rail 11, column 20, mounting channel 21, backlash-eliminating transmission mechanism 30, synchronous pulley 31, synchronous belt 32, driving member 33, output shaft 331, reduction assembly 34, final reduction transmission pair 341, first main pulley 3411, first secondary pulley 3412, first transmission belt 3413, primary reduction transmission pair 342, second main pulley 3421, second secondary pulley 3422, second transmission belt 3423, backlash-eliminating assembly 35, eccentric bearing 351, fixing part 352, fixing buckle 3521, baffle 3522, elastic component 353, second main part 3531, abutting part 3532, second elastic part 3533, bearing 354, adjustment component 36, first main part 361, sliding component 362, sliding part 3621, roller 3622, first elastic part 363, fixing plate 40, first side 41, second side 42, first rotating shaft 50, second rotating shaft 60. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below by means of specific embodiments in conjunction with the accompanying drawings. Similar elements in different embodiments are numbered with associated similar elements. In the following embodiments, many detailed descriptions are provided to enable the present application to be better understood. However, those skilled in the art will readily appreciate that some of the features may be omitted in different circumstances, or may be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification. This is to avoid the core portion of the present application being overwhelmed by excessive descriptions, and for those skilled in the art, it is not necessary to describe these related operations in detail. They will fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0030] In addition, the features, operations, or characteristics described in the specification may be combined in any appropriate manner to form various embodiments. Furthermore, the steps or actions in the method description may be reordered or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are provided solely for the purpose of clearly describing a particular embodiment and are not intended to be mandatory, unless otherwise specified.

[0031] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0032] The terms "parallel" and "perpendicular" are defined in terms of the current state of the art, rather than being absolutely strict definitions in a mathematical sense. A small amount of deviation is allowed, and being approximately parallel or approximately perpendicular is acceptable. For example, A and B are parallel, which means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0° and 10°. For example, A and B are perpendicular, which means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80° and 100°. The directional terms mentioned in the embodiments of the present application, such as "upper", "inner", "outer", "side", etc., are only directions with reference to the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present application.

[0033] Please refer to Figure 1 The present application provides a three-dimensional coordinate measuring machine (CMM). A CMM, which can be referred to as a three-dimensional coordinate measuring instrument (CMM), can measure points and convert the coordinate information of each measured point on a product component (i.e., a workpiece) during the manufacturing process into geometric information according to preset evaluation criteria. Therefore, a CMM can be used to assess the manufacturing quality of a workpiece or perform reverse engineering, providing the necessary data for workpiece quality inspection and manufacturing.

[0034] Specifically, this application defines the X-axis, Y-axis, and Z-axis, and a three-dimensional coordinate system based on the X-axis, Y-axis, and Z-axis. Figure 1 The X-axis, Y-axis, and Z-axis may be perpendicular to each other, and the Z-axis is generally oriented in the vertical direction. The coordinate measuring machine includes a workbench 10, a column 20, an anti-backlash transmission mechanism 30, a crossbeam (not shown), and a probe (not shown).

[0035] The workbench 10 is used to place the workpiece to be measured. A guide rail 11 is provided on the workbench 10, and the column 20 is slidably connected to the guide rail 11 so that the column 20 can slide back and forth on the guide rail 11. The guide rail 11 extends in the direction of the Y-axis, and the sliding direction of the column 20 is parallel to the Y-axis. Specifically, the column 20 is provided with a mounting channel 21 near the bottom of the workbench 10, and the mounting channel 21 extends in the direction of the Y-axis. The guide rail 11 is passed through the mounting channel 21 through an air-floating slider so that the column 20 can be slidably connected to the guide rail 11. The anti-backlash transmission mechanism 30 may refer to an X-axis transmission mechanism, a Y-axis transmission mechanism or a Z-axis transmission mechanism. The Y-axis transmission mechanism is provided on the column 20 and is used to drive the column 20 to move in the direction of the Y-axis.

[0036] The column 20 is fixedly connected to the crossbeam to support it. The crossbeam extends along the X-axis and is equipped with an X-axis transmission mechanism that can reciprocate along the crossbeam along the X-axis. The Z-axis transmission mechanism is mounted on the X-axis transmission mechanism and is slidably connected to the X-axis transmission mechanism. The Z-axis transmission mechanism can reciprocate along the Z-axis relative to the X-axis transmission mechanism. A probe is mounted at the bottom of the Z-axis transmission mechanism to measure workpieces placed on the worktable 10.

[0037] Thus, the X-axis drive mechanism can drive the probe in the X-axis direction, the Y-axis drive mechanism can drive the probe in the Y-axis direction, and the Z-axis drive mechanism can drive the probe in the Z-axis direction. Movement along the X-axis refers to reciprocating motion in both directions of the X-axis. Similarly, movement along the Y-axis refers to reciprocating motion in both directions of the Y-axis, and movement along the Z-axis refers to reciprocating motion in both directions of the Z-axis. Therefore, a three-dimensional coordinate measuring machine can obtain the three-dimensional coordinates (X, Y, Z) of a workpiece in a three-dimensional coordinate system.

[0038] This application further describes the anti-backlash transmission mechanism 30 on a three-dimensional coordinate measuring machine. This application provides an anti-backlash transmission mechanism 30 for a three-dimensional coordinate measuring machine, and the anti-backlash transmission mechanism 30 can refer to an X-axis transmission mechanism, a Y-axis transmission mechanism, or a Z-axis transmission mechanism. Figure 1 As shown, Figure 1 The anti-backlash transmission mechanism 30 shown is a Y-axis transmission mechanism. Figure 1-3 As shown, the backlash-eliminating transmission mechanism 30 includes a first rotating shaft 50 , a synchronous pulley 31 , a synchronous belt 32 , a driving member 33 , a deceleration assembly 34 , a backlash-eliminating assembly 35 and an adjustment assembly 36 .

[0039] Specifically, when the backlash elimination transmission mechanism 30 is a Y-axis transmission mechanism, the synchronous belt 32 is fixed to the workbench 10, fixed to the lower side of the column 20 and the guide rail 11, and extends along the Y-axis. The synchronous pulley 31 is disposed on the column 20. The synchronous pulley 31 can be indirectly disposed on the column 20. For example, in one embodiment, the backlash elimination transmission mechanism 30 for a three-dimensional coordinate measuring machine further includes a fixed plate 40, which is fixed to the column 20. The fixed plate 40 has a first side 41 and a second side 42 opposite to each other. The synchronous pulley 31 is mounted on a first rotating shaft 50 and is rotatably disposed on the first side 41 of the fixed plate 40 via the first rotating shaft 50. At least a portion of the backlash elimination assembly 35, the speed reduction assembly 34, and the adjustment assembly 36 are disposed on the second side 42 of the fixed plate 40. By setting each component on the fixed plate 40, the size of the fixed plate 40 can be easily determined according to the setting of the components, the arrangement of each component is more free, and it is easier to set up multi-stage deceleration and anti-backlash components 35 and adjustment components 36.

[0040] The synchronous belt 32 is engaged with the synchronous pulley 31, and the synchronous pulley 31 is driven to rotate by the driving member 33. The synchronous pulley 31 can reciprocate on the synchronous belt 32 to change the position of the synchronous pulley 31 on the synchronous belt 32. When the anti-backlash transmission mechanism 30 is a Y-axis transmission mechanism, the movement of the synchronous pulley 31 can control the movement of the column 20 in the Y-axis direction and change the position of the column 20 in the Y-axis direction. Therefore, the Y-axis transmission mechanism can be used to drive the column 20 to slide back and forth on the guide rail 11. The anti-backlash transmission mechanism 30 is driven by a belt drive, which has the advantages of smooth transmission and buffering and vibration absorption. Therefore, it is beneficial to improve the measurement accuracy of the three-dimensional coordinate measuring machine when measuring workpieces and the consistency of measurement accuracy during long-term operation.

[0041] like Figure 2 As shown, the driving member 33 is a power source. The driving member 33 can be, for example, a drive motor. The driving member 33 has an output shaft 331. The driving member 33 is mounted on a fixed plate 40, and the output shaft 331 is rotatably connected to the fixed plate 40. The reduction assembly 34 is disposed between the output shaft 331 and the first rotating shaft 50 to convert the higher speed motion output by the driving member 33 into lower speed motion of the first rotating shaft 50, thereby reducing the rotational speed of the synchronous pulley 31 to meet the operating requirements of the three-dimensional coordinate measuring machine and improve control accuracy.

[0042] like Figure 3-5 As shown, the reduction assembly 34 includes at least one reduction transmission pair. When the reduction assembly 34 includes two or more reduction transmission pairs, multi-stage reduction can be achieved. Among the at least one reduction transmission pair, one reduction transmission pair is a final-stage reduction transmission pair 341. When the reduction mechanism includes only one reduction transmission pair, the final-stage reduction transmission pair 341 is the reduction transmission pair. When the reduction mechanism includes at least two reduction transmission pairs, the final-stage reduction transmission pair 341 is the transmission pair farthest from the driving member 33 and the transmission pair closest to the synchronous pulley 31.

[0043] Among them, Figure 4 As shown, the final reduction transmission pair 341 is a pulley transmission pair. Specifically, the final reduction transmission pair 341 includes a first main pulley 3411, a first secondary pulley 3412 and a first transmission belt 3413. The first main pulley 3411 and the first secondary pulley 3412 are connected to each other through the first transmission belt 3413. The first secondary pulley 3412 is connected to the synchronous pulley 31 through the first rotating shaft 50, that is, the first secondary pulley 3412 rotates synchronously with the synchronous pulley 31.

[0044] When the reduction mechanism includes at least two reduction transmission pairs, the other reduction transmission pairs except the final reduction transmission pair 341 can also be pulley transmission pairs, thereby unifying the transmission mode of the entire backlash elimination transmission mechanism 30 so that the entire transmission mode is belt drive, thereby improving the transmission accuracy and smoothness. For example, in one embodiment, Figure 3 and Figure 4 As shown, Figure 4 The primary reduction transmission pair 342 is not shown. The reduction assembly 34 includes two reduction transmission pairs, one of which is the primary reduction transmission pair 342 and the other is the final reduction transmission pair 341 .

[0045] The primary reduction transmission pair 342 includes a second primary pulley 3421, a second secondary pulley 3422, and a second transmission belt 3423. The anti-backlash transmission mechanism 30 also includes a second rotating shaft 60. The first primary pulley 3411 and the second secondary pulley 3422 are disposed on the second rotating shaft 60. The second rotating shaft 60 is rotatably connected to the fixed plate 40. That is, the first primary pulley 3411 and the second secondary pulley 3422 can be rotatably connected to the fixed plate 40 via the second rotating shaft 60. The second primary pulley 3421 is disposed on the output shaft 331. The second primary pulley 3421 and the second secondary pulley 3422 are transmission-connected via the second transmission belt 3423. In other embodiments, when the reduction assembly 34 only includes the final reduction transmission pair 341, the first primary pulley 3411 can be directly disposed on the output shaft 331 of the driving member 33. When the reduction assembly 34 includes more than two reduction transmission pairs, more reduction transmission pairs can be arranged between the primary reduction transmission pair 342 and the final reduction transmission pair 341. For example, in one embodiment, the primary reduction transmission pair 342, the secondary reduction transmission pair, the tertiary reduction transmission pair, the fourth reduction transmission pair...the final reduction transmission pair 341 can be arranged in sequence from the drive motor to the synchronous pulley 31.

[0046] The anti-backlash assembly 35 is used to drive the first rotating shaft 50 to move toward the synchronous belt 32, so as to drive the synchronous pulley 31 to move toward the synchronous belt 32, so as to eliminate the meshing gap between the synchronous pulley 31 and the synchronous belt 32, so that the synchronous pulley 31 and the synchronous belt 32 remain meshed, and prevent the synchronous pulley 31 and the synchronous belt 32 from generating a meshing gap, thereby ensuring the operating stability and accuracy of the anti-backlash transmission mechanism 30.

[0047] During the backlash elimination process of the backlash elimination assembly 35, the movement of the first rotating shaft 50 toward the synchronous belt 32 can drive the first secondary pulley 3412 toward or away from the first primary pulley 3411, causing the first transmission belt 3413 to tighten or loosen. The adjustment assembly 36 is used to adaptively adjust the tension of the first transmission belt 3413 so that the first transmission belt 3413 is tensioned between the first primary pulley 3411 and the first secondary pulley 3412. It should be noted that the first transmission belt 3413 being tensioned between the first primary pulley 3411 and the first secondary pulley 3412 means that the first transmission belt 3413 is tensioned on the first primary pulley 3411 and the first secondary pulley 3412 with appropriate force. In this state, the first transmission belt 3413 is not easily disconnected or loosened.

[0048] When the anti-backlash assembly 35 eliminates backlash, the first transmission belt 3413 may become loose relative to its normal state, potentially causing it to become unstuck. The adjustment assembly 36 appropriately tightens the first transmission belt 3413, maintaining a suitable stress state. When the anti-backlash assembly 35 eliminates backlash, the first transmission belt 3413 may become taut relative to its normal state, potentially causing it to become disconnected. The adjustment assembly 36 appropriately loosens the first transmission belt 3413, maintaining a suitable stress state. Therefore, the addition of the adjustment assembly 36 to the anti-backlash transmission mechanism 30 of the present application allows the first transmission belt 3413 to be consistently and appropriately stressed, preventing it from becoming loose or disconnected. This improves the transmission stability between the synchronous pulley 31 and the drive member 33, thereby enhancing the motion stability of the stylus. Furthermore, even if a harder belt, such as a synchronous belt, is used for the first transmission belt 3413, the adjustment assembly 36 can maintain proper tension.

[0049] Furthermore, the provision of the adjustment assembly 36 reduces assembly and processing difficulties. During processing, the length of the first transmission belt 3413 does not need to be precisely specified; for example, it can be appropriately lengthened, or the position of the synchronous pulley 31 can be adjusted to a certain degree relative to the positions of other components. During assembly, since the first transmission belt 3413 can be lengthened, it can be easily positioned on the pulley of the final reduction transmission pair 341. The adjustment assembly 36 can then be pulled to ensure that the first transmission belt 3413 is properly installed with the appropriate force.

[0050] Furthermore, if the components mounted on the first rotating shaft 50 (e.g., the first secondary pulley 3412 and the synchronous pulley 31) are eccentric bodies, then, with the exception of the eccentric body and the sliding member 3621, the positions of most components (e.g., the components of the drive member 33 mounted on the second rotating shaft 60) can be fixed relative to the fixed plate. This can reduce the weight of the movable components during the backlash elimination process, thereby enabling more sensitive movement of the first rotating shaft 50. Specifically, arranging the drive member 33 and the reduction assembly 34 on the eccentric body will result in an excessively large eccentric body. When the eccentric body is too large, it will result in greater inertia, resulting in an insensitive backlash elimination effect of the synchronous pulley 31. To prevent inertial force, the present application arranges the drive member 33, the reduction assembly 34, etc. on the fixed plate 40. This allows the first secondary pulley 3412 of the final reduction transmission pair 341 to move relative to the first primary pulley 3411, causing the first transmission belt 3413 to loosen or tighten. Therefore, the adjustment assembly 36 is required to adjust the tension of the first transmission belt 3413.

[0051] In one embodiment, if Figure 4 、 Figure 6 and Figure 7 The adjustment assembly 36 has an elastic restoring force. Under the action of the elastic restoring force, the adjustment assembly 36 applies force to the first transmission belt 3413 to adaptively adjust the loop shape of the first transmission belt 3413. Specifically, the adjustment assembly 36 abuts against the first transmission belt 3413, and the location where the first transmission belt and the adjustment assembly 36 abut is a first abutment. The movement of the first rotating shaft 50 can cause the first secondary pulley 3412 to approach or move away from the first primary pulley 3411. When the first secondary pulley 3412 approaches the first primary pulley 3411, the elastic restoring force of the adjustment assembly 36 drives the first abutment to move toward the outside of the first transmission belt 3413. When the first secondary pulley 3412 moves away from the first primary pulley 3411, the first abutment drives the adjustment assembly 36 to move toward the inside of the first transmission belt 3413.

[0052] Specifically, the adjustment assembly 36 includes a first main member 361, a sliding assembly 362, and a first elastic member 363. The first main member 361 is fixed to the fixed plate 40. A first sliding track is provided within the first main member 361. The first sliding track can be formed by the first main member 361 alone, or the first sliding track can be formed by the first main member 361 and the fixed plate 40 in cooperation. For example, the first main member 361 can be provided with a slot on the side facing the fixed plate 40, and the slot and the fixed plate 40 can cooperate to form the first sliding track.

[0053] One end of the sliding assembly 362 is slidably connected to the first sliding track, and the first sliding track is used to limit the sliding assembly 362 so that the sliding direction of the sliding assembly 362 is consistent with the extension direction of the first sliding track. The other end of the sliding assembly 362 abuts the inner side of the first transmission belt 3413. It should be noted that after the first transmission belt 3413 is installed on the first primary pulley 3411 and the first secondary pulley 3412, the projection of the first transmission belt 3413 on the fixed plate 40 forms a closed figure. The side of the first transmission belt 3413 facing the center point of the closed figure is the inner side of the first transmission belt 3413, and the side of the first transmission belt 3413 facing away from the center point of the closed figure is the outer side of the first transmission belt 3413.

[0054] The first elastic member 363 connects the first main member 361 and the sliding assembly 362. The first elastic member 363 has an elastic restoring force that can cause the first abutment point of the first transmission belt 3413 to move outward from the first transmission belt 3413. Specifically, the elastic restoring force of the first elastic member 363 acts on the sliding assembly 362, causing the sliding assembly 362 to slide relative to the first main member 361. Because the sliding assembly 362 abuts the inner side of the first transmission belt 3413, the movement of the sliding assembly 362 adjusts the tension or relaxation of the first transmission belt 3413. After the first secondary pulley 3412 moves relative to the first primary pulley 3411, the first transmission belt 3413 becomes tightened or relaxed. The movement of the sliding assembly 362 restores the first transmission belt 3413 to an appropriate tension state.

[0055] When the first secondary pulley 3412 moves away from the first primary pulley 3411, the first transmission belt 3413 becomes taut, and the sliding assembly 362 can slide away from the first transmission belt 3413 under the push of the first transmission belt 3413, thereby appropriately relaxing the first transmission belt 3413 and restoring the tension of the first transmission belt 3413 caused by the movement of the first secondary pulley 3412, thereby restoring the appropriate force on the first transmission belt 3413. When the first secondary pulley 3412 moves closer to the first primary pulley 3411, the first transmission belt 3413 becomes slack, and the sliding assembly 362 slides toward the first transmission belt 3413 under the elastic restoring force of the first elastic member 363, thereby appropriately tensioning the first transmission belt 3413 and restoring the slack of the first transmission belt 3413 caused by the movement of the first secondary pulley 3412, thereby restoring the appropriate force on the first transmission belt 3413.

[0056] In one embodiment, if Figure 4As shown, the first main body 361 is located on the outside of the first transmission belt 3413, and the first elastic member 363 is a spring. The spring has an elastic restoring force that can make the sliding component 362 retract into the interior of the first main body 361. Therefore, when the first transmission belt 3413 is relaxed, the sliding component 362 retracts into the interior of the first main body 361 and pulls the first transmission belt 3413 at the abutment position between the sliding component 362 and the first transmission belt 3413, so that the first transmission belt 3413 is offset outward, thereby tensioning the first transmission belt 3413.

[0057] The spring can be selected as a tension spring or a compression spring according to the setting position of the spring in the first main body 361, for example, Figure 6 As shown, one end of the spring is connected to the first inner wall of the first sliding track away from the first transmission belt 3413, and the other end of the spring is connected to the end of the sliding component 362 opposite to the first inner wall. In this structure, the spring is a tension spring, so that the sliding component 362 has a tendency to move toward the inside of the first sliding track, so that the sliding component 362 can pull the first transmission belt 3413 to tighten when the first transmission belt 3413 is loose. Figure 7 As shown, one end of the spring is connected to the second inner wall of the first sliding track close to the first transmission belt 3413, and the other end of the spring is connected to the end of the sliding component 362 opposite to the second inner wall. In this structure, the spring is a compression spring, so that the sliding component 362 tends to move toward the inside of the first sliding track, so that the sliding component 362 can pull the first transmission belt 3413 to tighten when the first transmission belt 3413 is relaxed.

[0058] In other embodiments, the first main member 361 may be disposed inside the first transmission belt 3413, and the spring may have an elastic restoring force capable of pushing the sliding assembly 362 toward the outside of the first main member 361. When the first transmission belt 3413 is relaxed, the sliding assembly 362 moves toward the outside of the first main member 361 and pushes the first transmission belt 3413 at the point where the sliding assembly 362 and the first transmission belt 3413 abut against each other, causing the first transmission belt 3413 to shift outward, thereby tightening the first transmission belt 3413. Similarly, the spring may be a tension spring or a compression spring, depending on its location within the first main member 361. This will not be further described here. Of course, preferably, the first main member 361 is located outside the first transmission belt 3413, so that there is more space on the fixed plate 40 outside the first transmission belt 3413 for the adjustment assembly 36.

[0059] In one embodiment, if Figure 4As shown, the sliding assembly 362 includes a sliding member 3621 and a roller 3622. One end of the sliding member 3621 is slidably connected to the first sliding track and connected to the first elastic member 363. The other end of the sliding member 3621 is rotatably connected to the roller 3622, that is, the roller 3622 is rotatably mounted on the other end of the sliding member 3621. The roller 3622 abuts against the inner side surface of the first transmission belt 3413. By providing the roller 3622, the roller 3622 can reduce the friction between the sliding assembly 362 and the first transmission belt 3413, so that the first transmission belt 3413 can maintain normal transmission.

[0060] In one embodiment, if Figure 8-11 As shown, the anti-backlash assembly 35 is disposed near the first secondary pulley 3412 and is used to eliminate backlash between the synchronous pulley 31 and the synchronous belt 32. The anti-backlash assembly 35 includes an eccentric bearing 351, a fixing member 352, and an elastic member 353. The eccentric bearing 351 is sleeved on the first rotating shaft 50 and mounted on the fixing plate 40. Specifically, the eccentric bearing 351 can be mounted on the fixing plate 40 via a bearing 354. The fixing member 352 is fixed to the eccentric bearing 351. Specifically, the fixing member 352 can be sleeved on the eccentric bearing 351.

[0061] The elastic component 353 abuts the fixing part 352. The elastic component 353 is used to push the fixing part 352 to rotate when a back gap is generated between the synchronous pulley 31 and the synchronous belt 32. The rotation of the fixing part 352 can drive the eccentric bearing 351 to rotate, thereby driving the synchronous pulley 31 to rotate. Since the eccentric bearing 351 has an eccentric bearing hole, the synchronous pulley 31 can make a circular motion with the center line of the eccentric bearing 351 as the axis. Thus, the synchronous pulley 31 can move toward the synchronous belt 32 to keep the synchronous pulley 31 and the synchronous belt 32 engaged, thereby reducing the back gap between the synchronous pulley 31 and the synchronous belt 32.

[0062] In one embodiment, if Figure 10 and Figure 11The elastic assembly 353 includes a second main member 3531, an abutting member 3532, and a second elastic member 3533. The second main member 3531 is fixed to the fixed plate 40. A second sliding track is provided within the second main member 3531. The abutting member 3532 is slidably connected to the second sliding track. The second elastic member 3533 connects the second main member 3531 and the abutting member 3532. The abutting member 3532 abuts the fixed member 352 under the action of the second elastic member 3533. In one embodiment, the abutting member 3532 includes a push rod and a push ball. The push rod is connected to the second elastic member 3533 and slidably disposed on the second sliding track. The push ball is connected to the end of the push rod away from the second elastic member 3533. When backlash occurs between the synchronous pulley 31 and the synchronous belt 32, the push ball can be driven by the second elastic member 3533 to push the fixed member 352 to rotate, thereby changing the position of the synchronous pulley 31. The second elastic member 3533 can be, for example, a disc spring or a spring. In other embodiments, the push rod and the push ball may also be integrally formed, that is, the side of the push rod facing the fixing member 352 is a hemispherical structure.

[0063] In one embodiment, if Figure 10 and Figure 11 The fixing member 352 includes a fixing buckle 3521 and a baffle 3522. The fixing buckle 3521 is an arc-shaped structure. The fixing buckle 3521 is sleeved on the eccentric bearing 351. A part of the structure of the baffle 3522 is fixedly connected to the fixing buckle 3521. For example, the baffle 3522 can be fixed to the fixing buckle 3521 by bonding. Another part of the structure of the baffle 3522 extends out of the notch to abut against the elastic component 353. In other embodiments, the fixing buckle 3521 and the baffle 3522 can also be formed as one piece. During installation, the fixing buckle 3521 is arranged around the outer periphery of the eccentric bearing 351. The notch of the fixing buckle 3521 can be narrowed by tightening the threaded member on the fixing buckle 3521, and the fixing buckle 3521 can be tightly fastened to the outer periphery of the eccentric bearing 351.

[0064] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art can make several simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. A backlash-eliminating transmission mechanism for a three-coordinate measuring machine, characterized in that: include: a driving member having an output shaft; a first rotation axis; Synchronous pulley; a synchronous belt, the synchronous belt being engaged with the synchronous pulley, the synchronous pulley being capable of reciprocating on the synchronous belt; a reduction assembly, the reduction assembly being arranged between the output shaft and the first rotating shaft, the reduction assembly comprising at least one reduction transmission pair, and one of the reduction transmission pairs being a final reduction transmission pair, the final reduction transmission pair comprising a first primary pulley, a first secondary pulley and a first transmission belt, the first primary pulley being connected to the first secondary pulley via a first transmission belt, and the first secondary pulley being connected to the synchronous pulley via the first rotating shaft; an anti-backlash assembly, the anti-backlash assembly being used to drive the first rotating shaft to move toward the synchronous belt, thereby driving the synchronous pulley to move toward the synchronous belt, so as to eliminate the meshing gap between the synchronous pulley and the synchronous belt; and an adjustment component, wherein the movement of the first rotating shaft toward the synchronous belt drives the first secondary pulley to move relative to the first primary pulley, and the adjustment component is used to adaptively adjust the tightness of the first transmission belt so that the first transmission belt is tensioned between the first primary pulley and the first secondary pulley.

2. The anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine according to claim 1, characterized in that: It also includes a fixed plate having a first side and a second side opposite to each other, the output shaft and the first rotating shaft are both rotatably connected to the fixed plate, the synchronous pulley is arranged on the first side of the fixed plate, and at least part of the anti-backlash assembly, the deceleration assembly and the adjustment assembly are arranged on the second side of the fixed plate.

3. The anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine according to claim 2, characterized in that: The adjusting component has an elastic restoring force, and under the action of the elastic restoring force, the adjusting component applies force to the first transmission belt to adaptively adjust the loop shape of the first transmission belt.

4. The anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine according to claim 3, characterized in that: The adjustment assembly includes a first main body, a sliding assembly and a first elastic member. The first main body is fixed to the fixed plate. A first sliding track is provided in the first main body. One end of the sliding assembly is slidably connected to the first sliding track. The other end of the sliding assembly abuts against the inner side surface of the first transmission belt. The first elastic member connects the first main body and the sliding assembly.

5. The anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine according to claim 4, characterized in that: The sliding assembly includes a sliding member and a roller. One end of the sliding member is slidingly connected to the first sliding track, and the other end is rotationally connected to the roller. The roller abuts against the inner side surface of the first transmission belt.

6. The anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine according to claim 4, characterized in that: The first main body is located outside the first transmission belt, and the first elastic member is a spring. The spring has an elastic restoring force capable of causing the sliding assembly to retract into the interior of the first main body.

7. The anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine according to any one of claims 2 to 6, characterized in that: The anti-backlash assembly includes an eccentric bearing, a fixing part and an elastic component. The eccentric bearing is rotatably mounted on the first rotating shaft, and the eccentric bearing is installed on the fixing plate. The fixing part is fixedly connected to the eccentric bearing, and the elastic component abuts against the fixing part. The elastic component is used to push the fixing part to rotate, so as to drive the first rotating shaft to move toward the synchronous belt.

8. The anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine according to claim 7, characterized in that: The elastic component includes a second main body, an abutment member, and a second elastic member. The second main body is fixed to the fixed plate. A second sliding track is provided in the second main body. The abutment member is slidably connected to the second sliding track. The second elastic member connects the second main body and the abutment member. The abutment member abuts against the fixed member under the action of the second elastic member. And / or, the fixing part includes a fixing buckle and a baffle, the fixing buckle is an arc-shaped structure, the fixing buckle is sleeved on the eccentric bearing, a part of the baffle structure is fixedly connected to the fixing buckle, and another part of the baffle structure extends out of the notch of the fixing buckle to abut against the elastic component.

9. The anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine according to any one of claims 2 to 6, characterized in that: The deceleration assembly includes two deceleration transmission pairs, and one of the deceleration transmission pairs is a primary deceleration transmission pair, and the primary deceleration transmission pair includes a second main pulley, a second secondary pulley and a second transmission belt; the anti-backlash transmission mechanism for the three-dimensional coordinate measuring machine also includes a second rotating shaft, the second rotating shaft is rotatably connected to the fixed plate, the first main pulley and the second secondary pulley are arranged on the second rotating shaft, the second main pulley is arranged on the output shaft, and the second main pulley and the second secondary pulley are connected through a second transmission belt.

10. A three-coordinate measuring machine, characterized in that: include: A probe, the probe being used to measure a workpiece; and an anti-backlash transmission mechanism, wherein the anti-backlash transmission mechanism is the anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine as described in any one of claims 1 to 9, and the anti-backlash transmission mechanism is used to drive the probe to move.

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