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

Abstract

The invention provides an anti-backlash transmission mechanism for a three-coordinate measuring machine and the three-coordinate measuring machine. The transmission mechanism comprises a synchronous belt wheel, a synchronous belt, a driving piece, a first rotating shaft, a speed reduction assembly, a gap eliminating assembly and an adjusting assembly. The gap eliminating assembly is used for driving the first rotating shaft to move towards the synchronous belt so as to drive the synchronous belt wheel to move towards the synchronous belt and eliminate the meshing gap between the synchronous belt wheel and the synchronous belt. The first rotating shaft moves towards the synchronous belt to drive the first auxiliary belt wheel to move relative to the first main belt wheel, and the adjusting assembly is used for adjusting the tightness of the first transmission belt in a self-adaptive mode so that the first transmission belt can be arranged between the first main belt wheel and the first auxiliary belt wheel in a tensioning and sleeving mode. According to the transmission mechanism, the adjusting assembly is added, so that the first transmission belt can be constantly in a proper stress state, the transmission stability between the synchronous belt wheel and the driving part is improved, and the stability of the transmission mechanism for driving the measuring head to move is improved.

Description

Technical Field

[0001] The 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] The three-dimensional coordinate measuring machine, also known as a three-dimensional coordinate measuring instrument or a three-dimensional coordinate measuring bed, includes an anti-backlash transmission mechanism and a probe. The anti-backlash transmission mechanism can move the probe along three mutually perpendicular directions (X axis, Y axis, and Z axis). During the measurement process, the workpiece is placed on a marble platform, and the anti-backlash transmission mechanism controls the contact between the probe and the workpiece, records the position of the contact point when the probe contacts the workpiece, and then realizes the measurement of the workpiece.

[0003] The anti-backlash transmission mechanism usually includes a synchronous belt and a synchronous pulley that mesh with each other. The drive motor drives the synchronous pulley to rotate to change the position of the synchronous pulley on the synchronous belt, thereby controlling the movement of the probe. However, backlash is prone to occur between the synchronous pulley and the synchronous belt, causing the synchronous pulley to cause position error after reversing. After the anti-backlash component is used to eliminate the backlash, the addition of the anti-backlash component will change the position of the synchronous pulley, causing the transmission of the final stage of the reduction mechanism to be affected, such as the final stage of the reduction The transmission belt becomes loose or disconnected. Although the use of an elastic transmission belt can alleviate some of the effects, there is still a risk that the transmission between the synchronous pulley and the drive motor is 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 adding a backlash-eliminating component to the backlash-eliminating transmission mechanism causes the transmission between the synchronous pulley and the driving motor to be unstable.

[0005] In order to solve the above technical problems, the present application provides an anti-backlash transmission mechanism for a three-dimensional coordinate measuring machine. The anti-backlash transmission mechanism for a three-dimensional 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 by the first transmission belt transmission, and the first secondary pulley and the synchronous pulley are connected by the first rotating shaft; the clearance eliminating assembly is used to drive the first rotating shaft to move toward the synchronous belt, so as to drive the synchronous pulley to move toward the synchronous belt, so as to eliminate 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 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 has 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 the adjustment component applies force to the first transmission belt under the action of the elastic restoring force to adaptively adjust the surrounding shape of the first transmission belt.

[0008] In one embodiment, the adjustment component includes a first main body, a sliding component and a first elastic component. 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 component is slidably connected to the first sliding track. The other end of the sliding component abuts against the inner side surface of the first transmission belt. The first elastic component connects the first main body and the sliding component.

[0009] In one embodiment, the sliding assembly includes a sliding member and a roller, one end of the sliding member is slidably 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 against the fixing member. The elastic member is used to push the fixing member to rotate so as to drive the first rotating shaft to move toward the synchronous belt.

[0012] In one embodiment, 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, and the abutment 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 a 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 the second transmission belt.

[0015] In order to solve the above technical problems, the present application provides a three-dimensional coordinate measuring machine, which includes a probe and an anti-backlash transmission mechanism. The probe is used to measure the workpiece; the anti-backlash transmission mechanism is the anti-backlash transmission mechanism for the three-dimensional coordinate measuring machine involved in any of the above embodiments, and the anti-backlash transmission mechanism is used to drive the probe to move.

[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 component eliminates the backlash, the first secondary pulley will move relative to the first main pulley, causing the first transmission belt to be tensioned or loosened. The adjustment component can adjust the tightness of the first transmission belt. When the first transmission belt is relatively loose, it may cause loosening, and the adjustment component can make the first transmission belt appropriately tensioned, so that the first transmission belt is in a suitable stress state. When the first transmission belt is relatively tight, it may cause disconnection, and the adjustment component can make the first transmission belt appropriately loose, so that the first transmission belt is in a suitable stress state. Therefore, the anti-backlash transmission mechanism of the present application adds an adjustment component, which can make the first transmission belt always and continuously in a suitable stress state, prevent the first transmission belt from loosening or disconnecting, improve the transmission stability between the synchronous pulley and the driving member, and thus improve the motion stability of the probe. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 A schematic diagram of the structure of a synchronous pulley, a driving member, a speed 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 A 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 diagram of the structure of a synchronous pulley, a first secondary pulley, a fixing member, and an eccentric bearing provided in an embodiment of the present application;

[0025] Fig. 9 A schematic diagram of the structure of an eccentric bearing provided in one embodiment of the present application;

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

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

[0028] Reference numerals: workbench 10, guide rail 11, column 20, installation 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 member 352, fixing buckle 3521, baffle 3522, elastic component 353, second main body 3531, abutment member 3532, second elastic member 3533, bearing 354, adjustment component 36, first main body 361, sliding component 362, sliding member 3621, roller 3622, first elastic member 363, fixing plate 40, first side 41, second side 42, first rotating shaft 50, second rotating shaft 60. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, 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 part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to 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 can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0031] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0032] The terms "parallel", "vertical", etc. are defined for the current state of the art, rather than being absolutely strict definitions in a mathematical sense. A small amount of deviation is allowed, and approximately parallel, approximately vertical, etc. are all 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 reference to the directions of 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 a limitation on the embodiments of the present application.

[0033] Please refer to Figure 1 The present application provides a three-coordinate measuring machine. The three-coordinate measuring machine can be called a three-coordinate measuring instrument. The three-coordinate measuring machine can convert the coordinate information of each measured point on the product parts in the production process, that is, the workpiece, into geometric information based on the measurement of points according to the preset evaluation standard. Therefore, the three-coordinate measuring machine can be used to evaluate the manufacturing quality of the workpiece or realize reverse engineering, and provide necessary data for the quality inspection and manufacturing of the workpiece.

[0034] Specifically, the present application defines an X-axis, a Y-axis, and a Z-axis, and a three-dimensional coordinate system based on the X-axis, the Y-axis, and the Z-axis. Figure 1 The X-axis, Y-axis and Z-axis can be mutually perpendicular, and the direction of the Z-axis is usually along the vertical direction. The three-dimensional coordinate measuring machine includes a workbench 10, a column 20, a backlash-eliminating 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. Among them, the guide rail 11 extends along the direction of the Y-axis, and the sliding direction of the column 20 is parallel to the Y-axis direction. Specifically, the column 20 is provided with an installation channel 21 near the bottom of the workbench 10, and the installation channel 21 extends along the direction of the Y-axis. The guide rail 11 is penetrated in the installation 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 arranged 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 the crossbeam. The crossbeam extends along the X-axis direction, and an X-axis transmission mechanism is arranged on the crossbeam, and the X-axis transmission mechanism can reciprocate along the X-axis direction on the crossbeam. The Z-axis transmission mechanism is arranged on the X-axis transmission mechanism and can be slidably connected with the X-axis transmission mechanism, and the Z-axis transmission mechanism can reciprocate along the Z-axis direction relative to the X-axis transmission mechanism. The probe is arranged at the bottom of the Z-axis transmission mechanism to measure the workpiece placed on the workbench 10.

[0037] Therefore, the X-axis transmission mechanism can drive the probe to move in the X-axis direction, the Y-axis transmission mechanism can drive the probe to move in the Y-axis direction, and the Z-axis transmission mechanism can drive the probe to move in the Z-axis direction. Moving along the X-axis direction means that it can reciprocate in both directions of the X-axis. Similarly, moving along the Y-axis direction means that it can reciprocate in both directions of the Y-axis, and moving along the Z-axis direction means that it can reciprocate in both directions of the Z-axis. Therefore, the three-dimensional coordinate measuring machine can obtain the three-dimensional coordinates (X, Y, Z) of the workpiece in the three-dimensional coordinate system.

[0038] The present application further describes the anti-backlash transmission mechanism 30 on a three-dimensional coordinate measuring machine. The present 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 speed reduction assembly 34 , a backlash-eliminating assembly 35 and an adjusting assembly 36 .

[0039] Specifically, when the backlash-eliminating transmission mechanism 30 is a Y-axis transmission mechanism, the synchronous belt 32 is fixed to the workbench 10, the synchronous belt 32 is fixed to the lower side of the column 20 and the guide rail 11, and the synchronous belt 32 extends along the Y-axis direction. The synchronous pulley 31 is arranged on the column 20, and the synchronous pulley 31 can be arranged on the column 20 in an indirect manner. For example, in one embodiment, the backlash-eliminating transmission mechanism 30 for a three-dimensional coordinate measuring machine further includes a fixed plate 40, and the fixed plate 40 is fixed on 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 sleeved on the first rotating shaft 50, and the synchronous pulley 31 is rotatably arranged on the first side 41 of the fixed plate 40 through the first rotating shaft 50, and at least part of the backlash-eliminating assembly 35, the speed reduction assembly 34, and the adjustment assembly 36 are arranged on the second side 42 of the fixed plate 40. By arranging 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 speed reduction and anti-backlash components 35 and adjustment components 36.

[0040] The synchronous belt 32 is meshed 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, and the driving member 33 can be, for example, a driving motor, and the driving member 33 has an output shaft 331. The driving member 33 is disposed on the 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 high speed motion output by the driving member 33 into the low speed motion of the first rotating shaft 50, so as to reduce the rotation speed of the synchronous pulley 31, so as to meet the operation requirements of the three-dimensional coordinate measuring machine and improve the 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. In at least one reduction transmission pair, one of the reduction transmission pairs is a final reduction transmission pair 341. When the reduction mechanism includes only one reduction transmission pair, the final reduction transmission pair 341 is the reduction transmission pair. When the reduction mechanism includes at least two reduction transmission pairs, the final 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 and the synchronous pulley 31 are connected through the first rotating shaft 50, that is, the first secondary pulley 3412 and the synchronous pulley 31 rotate synchronously.

[0044] When the reduction mechanism includes at least two reduction transmission pairs, the other reduction transmission pairs except the final reduction transmission pair 341 may also be pulley transmission pairs, thereby unifying the overall transmission mode of the anti-backlash transmission mechanism 30, so that the overall transmission mode is belt drive, so as to improve 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 main 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, on which the first main pulley 3411 and the second secondary pulley 3422 are arranged, and the second rotating shaft 60 is rotatably connected to the fixed plate 40, that is, the first main pulley 3411 and the second secondary pulley 3422 can be rotatably connected to the fixed plate 40 through the second rotating shaft 60. The second main pulley 3421 is arranged on the output shaft 331, and the second main pulley 3421 and the second secondary pulley 3422 are transmission-connected through the second transmission belt 3423. In other embodiments, when the reduction assembly 34 only includes the final reduction transmission pair 341, the first main pulley 3411 can be directly arranged 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, a primary reduction transmission pair 342, a secondary reduction transmission pair, a tertiary reduction transmission pair, a fourth reduction transmission pair... and a 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 as to keep the synchronous pulley 31 and the synchronous belt 32 meshing, 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] In the process of eliminating the backlash of the backlash eliminating component 35, the movement of the first rotating shaft 50 toward the synchronous belt 32 can drive the first secondary pulley 3412 to move closer to or away from the first main pulley 3411, which will cause the first transmission belt 3413 to be tightened or loosened. The adjustment component 36 is used to adaptively adjust the tightness of the first transmission belt 3413 so that the first transmission belt 3413 is tensionedly sleeved between the first main pulley 3411 and the first secondary pulley 3412. It should be noted that the first transmission belt 3413 is tensionedly sleeved between the first main pulley 3411 and the first secondary pulley 3412 means that the first transmission belt 3413 is sleeved on the first main pulley 3411 and the first secondary pulley 3412 with appropriate force. In this state, the first transmission belt 3413 is not easy to break or loosen.

[0048] When the backlash elimination component 35 eliminates the backlash, the first transmission belt 3413 may be loosened relative to the normal state, which may cause the first transmission belt to loosen, and the adjustment component 36 can appropriately tighten the first transmission belt 3413, so that the first transmission belt 3413 is in a suitable stress state. When the backlash elimination component 35 eliminates the backlash, the first transmission belt 3413 may be tightened relative to the normal state, which may cause the first transmission belt 3413 to break, and the adjustment component 36 can appropriately loosen the first transmission belt 3413, so that the first transmission belt 3413 is in a suitable stress state. Therefore, the backlash elimination transmission mechanism 30 of the present application adds the adjustment component 36, which can make the first transmission belt 3413 always and continuously in a suitable stress state, prevent the first transmission belt 3413 from loosening or breaking, improve the transmission stability between the synchronous pulley 31 and the driving member 33, and thus improve the motion stability of the probe. At the same time, even if the first transmission belt 3413 uses a harder transmission belt such as a synchronous belt, the synchronous belt can be kept appropriately tensioned by the adjustment component 36.

[0049] In addition, by setting the adjustment component 36, the difficulty of assembly and processing can be reduced. During the processing, the length of the first transmission belt 3413 does not need to be too precise, for example, it can be appropriately longer, or the position of the synchronous pulley 31 and the position of other components can also have a certain deviation. During the assembly process, since the length of the first transmission belt 3413 can be made longer, it can be easily set on the pulley of the final stage reduction transmission pair 341, and then by pulling the adjustment component 36, the first transmission belt 3413 is installed with appropriate force.

[0050] In addition, if the components installed on the first rotating shaft 50 (such as the first secondary pulley 3412 and the synchronous pulley 31) are eccentric bodies, then except for the eccentric body and the sliding member 3621, the positions of most components (such as the components of the driving member 33 installed on the second rotating shaft 60, etc.) can be fixed relative to the fixed plate, which can reduce the weight of the movable components during the clearance elimination process, thereby making the movement of the first rotating shaft 50 more sensitive. Specifically, the driving member 33 and the reduction assembly 34 are arranged on the eccentric body, which will cause the volume of the eccentric body to be too large. When the volume of the eccentric body is too large, it will cause greater inertia, which will cause the clearance elimination effect of the synchronous pulley 31 to be insensitive. In order to prevent the inertial force, the present application arranges the driving member 33, the reduction assembly 34, etc. on the fixed plate 40, and the first secondary pulley 3412 of the final reduction transmission pair 341 will move relative to the first main pulley 3411, causing the first transmission belt 3413 to be loosened or tightened, so the adjustment assembly 36 is required to adjust the tightness of the first transmission belt 3413.

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

[0052] Specifically, the adjustment component 36 includes a first main body 361, a sliding component 362 and a first elastic member 363. The first main body 361 is fixed to the fixed plate 40, and a first sliding track is provided in the first main body 361, wherein the first sliding track may be formed by the first main body 361, or the first sliding track may be formed by the first main body 361 and the fixed plate 40. For example, a slot may be provided on one side of the first main body 361 facing the fixed plate 40, and the slot cooperates with the fixed plate 40 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 is in contact with 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 main pulley 3411 and the first secondary pulley 3412, the projection of the first transmission belt 3413 on the fixed plate 40 is a closed figure, and 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 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 move the first abutment of the first transmission belt 3413 toward the outside of the first transmission belt 3413. Specifically, the elastic restoring force of the first elastic member 363 acts on the sliding assembly 362 to make the sliding assembly 362 slide relative to the first main member 361. Since the sliding assembly 362 abuts against the inner side of the first transmission belt 3413, the movement of the sliding assembly 362 can adjust the first transmission belt 3413 to be properly tightened or relaxed. After the first secondary pulley 3412 moves relative to the first primary pulley 3411, the first transmission belt 3413 will be tightened or relaxed, and the movement of the sliding assembly 362 can restore the first transmission belt 3413 to a suitable stress state.

[0055] When the first secondary pulley 3412 is away from the first main pulley 3411, the first transmission belt 3413 is tightened, and the sliding assembly 362 can slide away from the first transmission belt 3413 under the push of the first transmission belt 3413, thereby causing the first transmission belt 3413 to relax appropriately, so as to restore the tension of the first transmission belt 3413 caused by the movement of the first secondary pulley 3412, so as to restore the appropriate force on the first transmission belt 3413. When the first secondary pulley 3412 is close to the first main pulley 3411, the first transmission belt 3413 is loosened, and the sliding assembly 362 slides toward the first transmission belt 3413 under the action of the elastic restoring force of the first elastic member 363, thereby causing the first transmission belt 3413 to be properly tensioned, so as to restore the slack of the first transmission belt 3413 caused by the movement of the first secondary pulley 3412, so as to restore 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 cause the sliding component 362 to retract into the first main body 361. Therefore, when the first transmission belt 3413 is relaxed, the sliding component 362 retracts into 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 to the outside, 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 loose.

[0058] In other embodiments, the first main body 361 may also be disposed on the inner side of the first transmission belt 3413, and the spring has an elastic restoring force capable of pushing the sliding assembly 362 to move to the outside of the first main body 361. When the first transmission belt 3413 is relaxed, the sliding assembly 362 moves to the outside of the first main body 361, and pushes the first transmission belt 3413 at the abutting position between the sliding assembly 362 and the first transmission belt 3413, so that the first transmission belt 3413 is offset to the outside, thereby tensioning the first transmission belt 3413. Similarly, the spring may be a tension spring or a compression spring according to the setting position of the spring in the first main body 361, which will not be described in detail here. Of course, preferably, the first main body 361 is located on the outside of the first transmission belt 3413, and there is more space on the fixing plate 40 on the outside of the first transmission belt 3413 to set 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 sleeved 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 clearance eliminating assembly 35 is arranged near the first secondary pulley 3412, and the clearance eliminating assembly 35 is used to eliminate the backlash between the synchronous pulley 31 and the synchronous belt 32. The clearance eliminating 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 the eccentric bearing 351 is installed on the fixing plate 40. Specifically, the eccentric bearing 351 can be installed on the fixing plate 40 through a bearing 354. The fixing member 352 is fixed on the eccentric bearing 351. Specifically, the fixing member 352 can be sleeved on the eccentric bearing 351.

[0061] The elastic component 353 abuts against the fixing part 352. The elastic component 353 is used to push the fixing part 352 to rotate when a backlash occurs 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. As a result, the synchronous pulley 31 can move toward the synchronous belt 32 to keep the synchronous pulley 31 and the synchronous belt 32 meshing, thereby reducing the backlash between the synchronous pulley 31 and the synchronous belt 32.

[0062] In one embodiment, if Fig.10 and Fig.11The elastic component 353 includes a second main body 3531, a contact member 3532 and a second elastic member 3533. The second main body 3531 is fixed on the fixed plate 40. A second sliding track is provided in the second main body 3531. The contact member 3532 is slidably connected to the second sliding track. The second elastic member 3533 connects the second main body 3531 and the contact member 3532. The contact member 3532 abuts against the fixed member 352 under the action of the second elastic member 3533. In one embodiment, the contact member 3532 includes a push rod and a push ball. The push rod is connected to the second elastic member 3533, and the push rod is slidably arranged on the second sliding track. The push ball is connected to one end of the push rod away from the second elastic member 3533. When a backlash occurs between the synchronous pulley 31 and the synchronous belt 32, the push ball can push the fixed member 352 to rotate under the action of the second elastic member 3533 to change 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 Fig.10 and Fig.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 gap to abut against the elastic component 353. In other embodiments, the fixing buckle 3521 and the baffle 3522 can also be integrally formed. During installation, the fixing buckle 3521 is arranged around the outer periphery of the eccentric bearing 351. The gap of the fixing buckle 3521 can be reduced by tightening the threaded member on the fixing buckle 3521, and the fixing buckle 3521 is tightly buckled on the outer periphery of the eccentric bearing 351.

[0064] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A backlash-eliminating transmission mechanism for a three-dimensional coordinate measuring machine, characterized in that: include: a drive member having an output shaft; a first rotation axis; Timing pulley; A synchronous belt, the synchronous belt is meshed with the synchronous belt pulley, and the synchronous belt pulley can reciprocate on the synchronous belt; A reduction assembly, 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 is connected to the first secondary pulley through a first transmission belt, and the first secondary pulley is connected to the synchronous pulley through the first rotating shaft; A backlash elimination component, the backlash elimination component is used to drive the first rotating shaft to move toward the synchronous belt, so as to drive the synchronous belt pulley to move toward the synchronous belt, so as to eliminate the meshing gap between the synchronous belt 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 main 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 main 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, which has 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 surrounding 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 component includes a first main body, a sliding component and a first elastic component. 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 component is slidably connected to the first sliding track. The other end of the sliding component abuts against the inner side surface of the first transmission belt. The first elastic component connects the first main body and the sliding component.

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 slidably 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 toward the inside 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 fixing plate, a second sliding track is arranged 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, and the abutment member abuts against the fixing 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 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 reduction assembly includes two reduction transmission pairs, and one of the reduction transmission pairs is a primary reduction transmission pair, and 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 a 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-dimensional 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 an 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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