Precise driving device and three-coordinate measuring machine

Abstract

The embodiment of the utility model provides a precise driving device which comprises a support, a driving device, a transmission assembly and a driving roller. The support comprises a pair of supporting plates and a transverse plate. The driving roller is arranged between the pair of supporting plates; the transmission assembly comprises a first-stage transmission device, a second-stage transmission device and a connecting shaft, and the first-stage transmission device and the second-stage transmission device are arranged on the two sides of the connecting shaft respectively; the support further comprises a connecting part, the connecting part comprises a connecting plate located between the connecting shaft and the driving roller and an elastic piece arranged on the connecting plate, and the connecting plate is located between the connecting shaft and the driving roller, so that the rotational inertia on the two sides of the support can be further balanced through the arrangement mode, and therefore the movement is more stable; meanwhile, the impact on the main shaft is reduced, the precision is improved, in addition, by adopting the structural arrangement, the structure is further optimized, and the structure can be suitable for a smaller installation space.

Description

Technical Field

[0001] The utility model relates to a precision driving device and a three-coordinate measuring machine using the precision driving device. Background Art

[0002] A three-dimensional coordinate measuring machine is a high-precision measuring device widely used in machining, mold, aviation, automobile, electronics and other industries. The three-dimensional coordinate measuring machine usually includes a base and a frame. The base can support the product to be inspected. The frame is mounted on the base to hold a spindle, and the spindle is suitable for holding, for example, a product inspection device for inspecting the product. The base, frame and / or spindle are usually configured so that the inspection device such as a measuring probe and the product can move relative to each other along at least one axis, or more typically along three mutually orthogonal axes X, Y and Z. At the same time, a drive device is provided to drive the inspection device held by the spindle along those axes. More specifically, at least one Z-axis drive device is included to drive the probe or probe to move along the axis Z direction to obtain the coordinate value of the measured object placed in the three-dimensional coordinate measurement space on the Z axis, so as to calculate the geometric size, shape and position of the measured object.

[0003] In the existing three-dimensional coordinate measuring machine, the mounting seat of the Z-axis drive device is usually directly set as a rectangular block, an elastic element is used to apply elastic force to a pair of rectangular blocks between a pair of rectangular blocks, and a pair of driving shafts are respectively set on the pair of rectangular blocks, and an actuator is connected to one of the driving shafts. In this structural form, on the one hand, it is difficult to adjust the pressure between the driving shaft and the Z-axis spindle, especially it is difficult to achieve fine adjustment to achieve higher precision driving. On the other hand, in this structure, the entire driving device is actually fixed on the air floating support or is directly integrated with the air floating support. When the air floating support is affected by external forces, such as slight vibration, inertia of movement, temperature or air pressure changes, it will also affect the Z-axis drive device, thereby affecting the driving accuracy.

[0004] In order to solve the above problems, document CN219996132U proposes to filter through elastic connecting pieces and springs to ensure driving stability. At the same time, slight vibrations of the driving component during movement are also filtered by the elastic connecting pieces and springs to prevent affecting other positions, thereby ensuring measurement accuracy. However, it is found in practice that when the above mechanism is used in a small-sized three-dimensional coordinate measuring machine, its structure is still relatively large, so that the motion inertia of the entire motion mechanism is still relatively large. It is necessary to provide a precision drive device with a more streamlined structural form, which can ensure driving stability and filter slight vibrations during movement. Summary of the invention

[0005] To this end, the present invention provides a precision driving device to solve the above technical problems.

[0006] A precision driving device comprises a support, a driving device, a transmission assembly and a driving roller arranged on the support;

[0007] The support comprises a pair of support plates and a transverse plate disposed between the support plates and connecting the pair of support plates;

[0008] The driving roller is arranged between a pair of supporting plates;

[0009] The transmission assembly comprises a primary transmission device, a secondary transmission device and a connecting shaft between the primary transmission device and the secondary transmission device, wherein the primary transmission device and the secondary transmission device are respectively arranged on both sides of the connecting shaft;

[0010] The support also includes a connecting portion for connecting the precision drive device to the three-dimensional coordinate measuring machine, the connecting portion includes a connecting plate located between the connecting shaft and the driving roller and an elastic sheet arranged on the connecting plate, and the connecting plate is located between the connecting shaft and the driving roller.

[0011] Wherein, the pair of support plates and the transverse plate are arranged to form a containing space, and the driving roller includes a contact section and end portions located on both sides of the contact section, and at least a portion of the contact section protrudes from the containing space.

[0012] Wherein, the connecting shaft is located directly above the connecting plate, and the driving roller is located directly below the connecting plate.

[0013] Wherein, the connecting shaft includes a first axis, the driving roller includes a second axis, the distances between the connecting plate and the first axis and the second axis are equal, and the first axis is parallel to the second axis.

[0014] The connecting plate includes a first surface and a second surface opposite to the first surface, and a first virtual plane is defined passing through the first axis and the second axis, and the first virtual plane is perpendicular to the second surface.

[0015] Wherein, the primary transmission device includes a driving wheel connected to the driving device, the driving wheel includes a third axis, and a second virtual plane is defined to pass through the first axis and the third axis. The angle between the second virtual plane and the first virtual plane is α, then α=75°~88°.

[0016] Wherein, the elastic sheet is connected to the second surface.

[0017] Wherein, the primary transmission device includes a first driven wheel arranged at one end of the connecting shaft, and the secondary transmission device includes a second driven wheel arranged at one end of the driving roller, and the diameters of the first driven wheel and the second driven wheel are the same.

[0018] A connecting seat is also provided at the end of the elastic sheet, and the connecting seat includes a transverse connecting end and a vertical connecting end perpendicular to the transverse connecting end, wherein the transverse connecting end includes a fitting surface fitted with the surface of the elastic sheet, and the vertical connecting end includes a vertical connecting surface, and the vertical connecting surface is perpendicular to the fitting surface.

[0019] The utility model also provides a three-coordinate measuring machine, which comprises the above-mentioned precision driving device.

[0020] Beneficial effects: The embodiment of the utility model provides a precision driving device, including a support and a driving device, a transmission assembly and a driving roller arranged on the support; the support includes a pair of support plates and a transverse plate arranged between the support plates and connecting the pair of support plates; the driving roller is arranged between the pair of support plates; the transmission assembly includes a primary transmission device, a secondary transmission device and a connecting shaft between the primary transmission device and the secondary transmission device, and the primary transmission device and the secondary transmission device are respectively arranged on both sides of the connecting shaft; the support also includes a connecting part for connecting the precision driving device to a three-coordinate measuring machine, the connecting part includes a connecting plate located between the connecting shaft and the driving roller and an elastic sheet arranged on the connecting plate, and the connecting plate is located between the connecting shaft and the driving roller. Through the above-mentioned arrangement, the rotational inertia on both sides of the support can be further balanced, so that the movement is smoother, while reducing the impact on the main shaft and improving the accuracy. In addition, with this structural arrangement, the structure is further optimized and can be suitable for a smaller installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the precision drive device of the embodiment of the utility model;

[0022] Figure 2 for Figure 1 Schematic diagram from the bottom right looking up;

[0023] Figure 3 for Figure 1 Schematic diagram of top view;

[0024] Figure 4 for Figure 1 A rear view schematic diagram of

[0025] Figure 5 for Figure 1 Schematic diagram of the left side;

[0026] Support 10; left support plate 11; base portion 111; extension portion 112; transverse plate 12; right support plate 13; connecting plate 14; first surface 141; second surface 142; protrusion 143; through hole 144; elastic sheet 15; connecting seat 16; bracket 17; installation space 170; transverse plate 171; vertical plate 172; driving device 21; transmission assembly 30; driving wheel 31; third axis 310; first driven wheel 32; first belt 33; connecting shaft 34; first axis 340; end wheel 35; second driven wheel 36; second belt 37; first virtual plane 380; second virtual plane 390; driving roller 41; second axis 410. DETAILED DESCRIPTION

[0027] Please refer to Figure 1-Figure 5 The embodiment of the utility model provides a precision driving device 21, which is usually arranged on an air-floating support 10, and is used to drive the spindle of a three-dimensional coordinate measuring machine, and is particularly used in the Z-axis driving device 21 of the three-dimensional coordinate measuring machine to drive its Z-axis spindle so that the position of a probe or a probe arranged at the end of the Z-axis spindle changes.

[0028] The precision driving device 21 comprises a support 10 and a driving device 21 , a transmission assembly 30 and a driving roller 41 arranged on the support 10 .

[0029] The support 10 includes a pair of support plates and a transverse plate 12 arranged between the support plates and connecting the pair of support plates. The pair of support plates and the transverse plate 12 are arranged to form a accommodating space. For the convenience of description, the pair of support plates are respectively referred to as a left support plate 11 and a right support plate 13. The left support plate 11 and the right support plate 13 are arranged in parallel and spaced apart from each other. The transverse plate 12 is arranged between the left support plate 11 and the right support plate 13, and its two ends are respectively fixedly connected with the left support plate 11 and the right support plate 13, so that the entire support 10 is in an inverted U shape. At the same time, the left support plate 11, the right support plate 13 and the transverse plate 12 are arranged to form an open accommodating space.

[0030] The driving roller 41 is arranged between the left supporting plate 11 and the right supporting plate 13. In the present embodiment, the driving roller 41 and the transverse plate 12 are arranged back to back, so that the transverse plate 12 and the driving roller 41 are arranged on the upper and lower sides of the support 10 respectively. The driving roller 41 is used to contact the main shaft and drive the main shaft to move when the driving roller 41 rotates. The driving roller 41 includes a contact section and ends located on both sides of the contact section, wherein the ends are rotatably arranged on the left supporting plate 11 and the right supporting plate 13. The contact section includes a contact surface that contacts the main shaft. It can be understood that at least a part of the contact section protrudes from the accommodating space, that is, a part of the contact surface is located outside the accommodating space, so that the contact surface can more easily contact the main shaft and drive the main shaft to move.

[0031] Furthermore, the abutment section is also coated with a cushion layer, which can be made of elastic material, which can increase the friction with the main shaft on the one hand and reduce damage to the main shaft surface on the other hand. Preferably, the cushion layer can be a rubber layer.

[0032] The transmission assembly 30 is arranged between the driving device 21 and the driving roller 41, and is used to reduce the rotation speed and drive the driving roller 41 to rotate when the driving device 21 rotates. In this embodiment, the transmission assembly 30 includes a primary transmission device, a secondary transmission device and a connecting shaft 34 between the primary transmission device and the secondary transmission device. The primary transmission device and the secondary transmission device are respectively arranged on both sides of the connecting shaft 34.

[0033] Specifically, the primary transmission device includes a driving wheel arranged on the driving device 21, a first driven wheel 32 arranged at one end of the connecting shaft 34, and a first belt 33 wound around the driving wheel and the first driven wheel 32, and the secondary transmission device includes an end wheel 35 arranged at the other end of the connecting shaft 34, a second driven wheel 36 arranged at one end of the driving roller 41, and a second belt 37 wound around the end wheel 35 and the second driven wheel 36. It can be understood that the diameter of the first driven wheel 32 is larger than that of the driving wheel, and the diameter of the second driven wheel 36 is larger than that of the end wheel 35, so that the transmission assembly 30 forms a secondary reduction mechanism.

[0034] The support 10 also includes a connecting portion for connecting the precision drive device 21 to the three-dimensional coordinate measuring machine, and the connecting portion includes a connecting plate 14 located between the connecting shaft 34 and the driving roller 41 and an elastic sheet 15 arranged on the connecting plate 14, and the connecting plate 14 is located between the connecting shaft 34 and the driving roller 41.

[0035] In this embodiment, the connecting plate 14 includes two opposite side ends and a front end and a rear end located between the two side ends, and the two side ends are respectively connected to the left support plate 11 and the right support plate 13. At the same time, the front end includes a protrusion 143, and the protrusion 143 is provided with a through hole 144. The through hole 144 is used to pass an adjusting bolt (not shown). One end of the adjusting bolt is connected to a suspension base, and the rear end is provided with an elastic sheet 15. One end of the elastic sheet 15 is fixed to the connecting plate 14, and the other end extends outward and is used to be fixed to the suspension base. That is, the entire precision drive device 21 is flexibly connected to the suspension base through the adjusting bolt and the elastic sheet 15 to reduce vibration and better drive the main shaft.

[0036] It can be understood that the elastic sheet 15 can be a steel sheet. In a specific embodiment, the elastic sheet 15 is a steel sheet with a thickness of 1-5 mm.

[0037] Furthermore, the connecting plate 14 includes a first surface 141 and a second surface 142 facing away from the first surface 141. The first surface 141 is a surface facing the side of the transverse plate 12, and the second surface 142 is a surface facing the side of the driving roller 41. In the present embodiment, the first surface 141 and the second surface 142 are arranged in parallel. Of course, in other embodiments, the first surface 141 may not be arranged to be parallel to the second surface 142, but the second surface 142 should be arranged to be a straight surface.

[0038] Furthermore, the connecting shaft 34 is located directly above the connecting plate 14, and the driving roller 41 is located directly below the connecting plate 14. The meaning of "directly above" is that the projection of the connecting shaft 34 on the first surface 141 is located within the area defined by the first surface 141. Similarly, the meaning of "directly below" is that the projection of the driving roller 41 on the second surface 142 is located within the area defined by the second surface 142.

[0039] Furthermore, the connecting plate 14 and the transverse plate 12 are arranged in parallel and at intervals.

[0040] Furthermore, the connecting shaft 34 includes a first axis 340 , the driving roller 41 includes a second axis 410 , and the distances between the connecting plate 14 and the first axis 340 and the second axis 410 are equal. It can be understood that the first axis 340 is parallel to the second axis 410 .

[0041] Furthermore, a first virtual plane 380 is defined passing through the first axis 340 and the second axis 410. The first virtual plane 380 should be perpendicular to the second surface 142 so that the connecting shaft 34, the first driven wheel 32 and the end wheel 35 arranged at both ends of the connecting shaft 34, the driving roller 41 and the second driven wheel 36 arranged on one side of the driving roller 41 can be in balance when rotating, and the impact on the main shaft during movement is minimized.

[0042] Furthermore, the driving wheel 31 includes a third axis 310, and a second virtual plane 390 is defined to pass through the first axis 340 and the third axis 310. The angle between the second virtual plane 390 and the first virtual plane 380 is α, then α=75°~88°. In this case, the projection of the third axis 310 on the first virtual plane 380 is located in the area between the first axis 340 and the second axis 410, and the projection of the third axis 310 on the first virtual plane 380 is adjacent to the first axis 340. In this case, the impact on the main shaft during movement is further reduced.

[0043] It is found in practice that by arranging the first transmission device and the second transmission device on both sides of the support 10, the rotational inertia on both sides of the support 10 can be further balanced, so that the movement is more stable. Arranging the connecting shaft 34 and the driving roller 41 just above and just below the connecting plate 14 respectively can make the movement process more stable and reduce the impact on the main shaft, thereby improving the accuracy. At the same time, adopting this structural arrangement,

[0044] Compared with the prior art, its structure is further optimized and can be suitable for smaller installation space and volume.

[0045] Furthermore, the diameters of the first driven wheel 32 and the second driven wheel 36 are the same.

[0046] Furthermore, the elastic sheet 15 is connected to the second surface 142 .

[0047] Furthermore, a connecting seat 16 for connecting to a suspended base is also provided at the end of the elastic sheet 15, and the connecting seat 16 includes a transverse connecting end and a vertical connecting end perpendicular to the transverse connecting end, wherein the transverse connecting end includes a fitting surface that fits with the surface of the elastic sheet 15, and the vertical connecting end includes a vertical connecting surface, and the vertical connecting surface is perpendicular to the fitting surface.

[0048] Furthermore, the horizontal connecting end and the vertical connecting end form an inverted "L" shape.

[0049] Furthermore, the left support plate 11 includes a base portion 111 and an extension portion 112 , wherein the base portion 111 is arranged corresponding to the right support plate 13 , and the driving device 21 is arranged on the extension portion 112 .

[0050] Furthermore, a bracket 17 is also provided on the extension portion 112, and the driving device 21 is provided on the bracket 17. The bracket 17 includes an installation space 170 for arranging a coupling and other devices in the installation space 170. The bracket 17 includes a transverse plate 171 and a vertical plate 172, wherein the transverse plate 171 is arranged in parallel and spaced relation with the extension portion 112 to form the installation space 170, and one end of the vertical plate 172 is fixedly connected to the transverse plate 171, and the other end is arranged on the extension portion 112. Preferably, the bracket 17 is L-shaped.

[0051] It can be understood that the driving device 21 can be a motor.

[0052] The utility model also provides a three-coordinate measuring machine using the above-mentioned precision driving device 21 .

[0053] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A precision driving device, comprising a support and a driving device, a transmission assembly and a driving roller arranged on the support, characterized in that: The support comprises a pair of support plates and a transverse plate disposed between the support plates and connecting the pair of support plates; The driving roller is arranged between a pair of supporting plates; The transmission assembly comprises a primary transmission device, a secondary transmission device and a connecting shaft between the primary transmission device and the secondary transmission device, wherein the primary transmission device and the secondary transmission device are respectively arranged on both sides of the connecting shaft; The support also includes a connecting portion for connecting the precision drive device to the three-dimensional coordinate measuring machine, the connecting portion includes a connecting plate located between the connecting shaft and the driving roller and an elastic sheet arranged on the connecting plate, and the connecting plate is located between the connecting shaft and the driving roller.

2. The precision drive device according to claim 1, characterized in that: The pair of support plates and the transverse plate are arranged to form a containing space, and the driving roller includes a contact section and end portions located on both sides of the contact section, and at least a portion of the contact section protrudes from the containing space.

3. The precision drive device according to claim 1, characterized in that: The connecting shaft is located directly above the connecting plate, and the driving roller is located directly below the connecting plate.

4. The precision drive device according to claim 3, characterized in that: The connecting shaft includes a first axis, the driving roller includes a second axis, the distances between the connecting plate and the first axis and the second axis are equal, and the first axis is parallel to the second axis.

5. The precision drive device according to claim 4, characterized in that: The connecting plate comprises a first surface and a second surface opposite to the first surface, and defines a first virtual plane passing through the first axis and the second axis, wherein the first virtual plane is perpendicular to the second surface.

6. The precision drive device according to claim 5, characterized in that: The primary transmission device includes a driving wheel connected to the driving device, and the driving wheel includes a third axis. The second virtual plane is defined to pass through the first axis and the third axis. The angle between the second virtual plane and the first virtual plane is α, then α=75°~88°.

7. The precision drive device according to claim 5, characterized in that: The elastic sheet is connected to the second surface.

8. The precision drive device according to claim 5, characterized in that: The primary transmission device comprises a first driven wheel arranged at one end of the connecting shaft, and the secondary transmission device comprises a second driven wheel arranged at one end of the driving roller, and the diameters of the first driven wheel and the second driven wheel are the same.

9. The precision drive device according to claim 5, characterized in that: A connecting seat is also provided at the end of the elastic sheet, and the connecting seat includes a transverse connecting end and a vertical connecting end perpendicular to the transverse connecting end, wherein the transverse connecting end includes a fitting surface that fits with the surface of the elastic sheet, and the vertical connecting end includes a vertical connecting surface, and the vertical connecting surface is perpendicular to the fitting surface.

10. A three-dimensional coordinate measuring machine, characterized in that: The invention comprises a precision drive device as claimed in any one of claims 1 to 9.

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