A high-precision height adjustment mechanism

Abstract

The present invention discloses a high-precision height adjustment mechanism, comprising a frame, a drive motor, a bidirectional lead screw, a left lead screw nut, a right lead screw nut, a lower left wedge, a lower right wedge, an upper left wedge, an upper right wedge and a top connecting block, wherein the drive motor is mounted on the frame and driven to connect the bidirectional lead screw via a transmission assembly, the left lead screw nut and the right lead screw nut are respectively threadedly connected to the bidirectional lead screw, the lower left wedge is connected to the left lead screw nut, the lower right wedge is connected to the right lead screw nut, the lower left wedge and the lower right wedge are respectively movably mounted on the frame via a first sliding assembly, the upper left wedge is movably connected to the lower left wedge via a second sliding assembly, the upper right wedge is movably connected to the lower right wedge via another second sliding assembly, and the upper left wedge and the upper right wedge are respectively movably connected to the frame via a lifting sliding assembly. The high-precision height adjustment mechanism can achieve micron-level adjustment accuracy of height adjustment, and can ensure the position and posture of the mechanism when the enable is disconnected.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical engineering, and in particular to a high-precision height adjustment mechanism. Background Art

[0002] At present, in the vertical height adjustment of mechanical equipment, linear motor direct drive or servo motor directly combined with screw drive is commonly used, which can drive the mechanical device to perform vertical linear motion to adjust the height of the device and realize the height adjustment function of the mechanical device. However, when the linear motor direct drive method is disconnected, the linear motor will no longer work and cannot maintain the height of the mechanical device. The mechanical device will slide under the influence of gravity when it is disconnected; while the servo motor directly combined with the screw drive method can adjust the height over a large range, but the accuracy is general and cannot meet some high-precision, high-resolution adjustment usage scenarios. In addition, the above two methods are only suitable for scenarios with a large movement range, with a movement range of tens of millimeters to hundreds of millimeters, and it is difficult to achieve high-precision adjustment within the millimeter range.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a high-precision height adjustment mechanism, which aims to solve the technical problems in the prior art that the adjustment accuracy is not high and it is difficult to maintain the required height position when the enable is disconnected, so as to ensure the position and posture of the mechanism when the enable is disconnected, and use a higher transmission ratio to make the resolution of the height adjustment reach sub-micron or even nanometer level.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-precision height adjustment mechanism, which includes: a frame, a drive motor, a bidirectional lead screw, a left lead screw nut, a right lead screw nut, a lower left wedge, a lower right wedge, an upper left wedge, an upper right wedge and a top connecting block, the drive motor is installed on the frame and is driven and connected to the bidirectional lead screw via a transmission assembly, the left lead screw nut and the right lead screw nut are respectively threadedly connected to the two sections of the bidirectional lead screw, the lower left wedge is driven and connected to the left lead screw nut, the lower right wedge is driven and connected to the right lead screw nut, and the lower left wedge and the lower right wedge are respectively movably installed on the frame via a first sliding assembly. The upper left wedge block and the upper right wedge block are respectively movably connected to the lower left wedge block and the lower right wedge block via the second sliding assembly, the upper left wedge block and the upper right wedge block are respectively movably connected to the frame via the lifting sliding assembly, the bottom of the top connecting block is respectively connected to the top of the upper left wedge block and the upper right wedge block, and the top connecting block is used to connect an external mechanical structure; the wedge surface of the upper left wedge block is parallel to the wedge surface of the lower left wedge block, the wedge surface of the upper right wedge block is parallel to the wedge surface of the lower right wedge block, the wedge surface of the upper left wedge block gradually tilts upward from left to right, and the wedge surface of the upper right wedge block gradually tilts downward from left to right.

[0007] The high-precision height adjustment mechanism, wherein the frame includes a base, a screw fixing seat and a screw support seat, the screw fixing seat and the screw support seat are respectively installed on the base, and the two ends of the bidirectional screw are respectively rotatably installed on the screw fixing seat and the screw support seat.

[0008] The high-precision height adjustment mechanism, wherein the transmission assembly includes a harmonic reducer, a reducer connector and a coupling, the drive motor is fixedly connected to the harmonic reducer via the reducer connector, and the harmonic reducer is connected to the bidirectional screw via the coupling.

[0009] The high-precision height adjustment mechanism, wherein the frame also includes a reducer support seat, the reducer support seat is fixedly installed on one end of the base, and the reducer connecting member is fixedly installed on the reducer support seat.

[0010] The high-precision height adjustment mechanism, wherein the lifting sliding assembly includes a left cross roller slide, a right cross roller slide, a left slide connecting plate and a right slide connecting plate, one side of the left cross roller slide is fixedly connected to one side of the left slide connecting plate, and the other side of the left slide connecting plate is fixedly connected to the left end of the upper left wedge; one side of the right cross roller slide is fixedly connected to one side of the other right slide connecting plate, and the other side of the right slide connecting plate is fixedly connected to the right end of the upper right wedge.

[0011] The high-precision height adjustment mechanism, wherein the frame also includes a left slide support plate and a right slide support plate respectively installed at both ends of the base, the other side of the left cross roller slide is fixedly installed on the right side of the left slide support plate, and the other side of the right cross roller slide is fixedly installed on the left side of the right slide support plate.

[0012] The high-precision height adjustment mechanism, wherein the first sliding assembly includes a first left guide rail, a first left slider, a first right guide rail and a first right slider, the first left guide rail and the first right guide rail are located in the same straight line and are installed on the base, the first left slider is slidably installed on the first left guide rail, and the lower left wedge is fixedly connected to the top of the first left slider, the first right slider is slidably installed on the first right guide rail, and the lower right wedge is fixedly connected to the top of the first right slider.

[0013] The high-precision height adjustment mechanism, wherein the second sliding assembly includes a second left guide rail, a second left slider, a second right guide rail and a second right slider, the second left guide rail is fixedly mounted on the top of the lower left wedge block, the second left slider is slidably connected to the second left guide rail and fixedly connected to the bottom of the upper left wedge block, the second right guide rail is fixedly mounted on the top of the lower right wedge block, and the second right slider is slidably connected to the second right guide rail and fixedly connected to the bottom of the upper right wedge block.

[0014] The high-precision height adjustment mechanism, wherein the first sliding assembly also includes four slider limit blocks, which are respectively arranged at the two ends of the first left guide rail and the first right guide rail, and the slider limit blocks are used to slide and limit the first left slider and the first right slider.

[0015] The high-precision height adjustment mechanism further includes two nut connecting blocks, the left lead screw nut is fixedly connected to the left lower wedge block via one nut connecting block, and the right lead screw nut is fixedly connected to the right lower wedge block via the other nut connecting block.

[0016] Beneficial effects:

[0017] The present invention provides a high-precision height adjustment mechanism, which includes a frame, a drive motor, a transmission assembly, a bidirectional lead screw, a left lead screw nut, a right lead screw nut, a first sliding assembly, a lower left wedge block, a lower right wedge block, a second sliding assembly, an upper left wedge block, an upper right wedge block, a lifting sliding assembly and a top connecting block. When the mechanism needs to rise, the driving motor rotates forward to drive the transmission assembly to drive the two-way lead screw to rotate forward, the left lead screw nut drives the lower left wedge block to move left along the first sliding assembly, the right lead screw nut drives the lower right wedge block to move right along the first sliding assembly, the upper left wedge block moves right and upward relative to the lower left wedge block via the second sliding assembly, the upper right wedge block moves left and upward relative to the lower right wedge block via the second sliding assembly, and the top connecting block is lifted up by the upper left wedge block and the upper right wedge block, thereby driving the external mechanical device connected to it to rise accordingly; when the mechanism needs to fall, the driving motor reverses to drive the transmission assembly to drive the two-way lead screw to rotate in the opposite direction, the left lead screw nut drives the lower left wedge block to move right along the first sliding assembly, the right lead screw nut drives the lower right wedge block to move left along the first sliding assembly, the upper left wedge block moves left and downward relative to the lower left wedge block via the second sliding assembly, the upper right wedge block moves right and downward relative to the lower right wedge block via the second sliding assembly, and the top connecting block is driven down by the upper left wedge block and the upper right wedge, thereby driving the external mechanical device connected to it to fall accordingly. This high-precision height adjustment mechanism achieves height adjustment with micron-level adjustment accuracy within the millimeter-level motion range through the drive cooperation of a bidirectional screw mechanism and upper and lower wedges, and can ensure the position and posture of the mechanism when the enable is off. The use of a higher transmission ratio can make the resolution of the height adjustment reach sub-micron or even nanometer level. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of the high-precision height adjustment mechanism provided by the present invention;

[0019] Figure 2 This is a schematic diagram of the main structure of the high-precision height adjustment mechanism provided by the present invention;

[0020] Figure 3 This is a schematic top view of the high-precision height adjustment mechanism provided by the present invention.

[0021] Reference numerals:

[0022] 1—Drive motor 2—Bidirectional screw 3—Left screw nut

[0023] 4—right screw nut 5—lower left wedge 6—lower right wedge

[0024] 7—Upper left wedge 8—Upper right wedge 9—Top connecting block

[0025] 10—base 11—screw fixing seat 12—screw support seat

[0026] 13—Harmonic reducer 14—Reducer connector 15—Coupling

[0027] 16—Reducer support seat 17—Left cross roller slide 18—Right cross roller slide

[0028] 19—Left slide connecting plate 20—Right slide connecting plate 21—Left slide supporting seat

[0029] 22—right slide support 23—first left guide rail 24—first left slide

[0030] 25 - first right guide rail 26 - first right slider 27 - second left guide rail

[0031] 28 - second left slider 29 - second right guide rail 30 - second right slider

[0032] 31—Slider limit block 32—Nut connection block. DETAILED DESCRIPTION

[0033] The present invention provides a high-precision height adjustment mechanism. To make the objectives, technical solutions, and effects of the present invention more clear and explicit, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as limiting the present invention. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] See also Figures 1 to 3As shown, the present invention provides a high-precision height adjustment mechanism, which includes: a frame, a driving motor 1, a bidirectional lead screw 2, a left lead screw nut 3, a right lead screw nut 4, a lower left wedge 5, a lower right wedge 6, an upper left wedge 7, an upper right wedge 8 and a top connecting block 9. The driving motor 1 is installed on the frame and is driven to connect to the bidirectional lead screw 2 via a transmission assembly. The left lead screw nut 3 and the right lead screw nut 4 are respectively threadedly connected to the two sections of the bidirectional lead screw 2. The lower left wedge 5 is driven to connect to the left lead screw nut 3, and the lower right wedge 6 is driven to connect to the right lead screw nut 4. The lower left wedge 5 and the lower right wedge 6 are respectively movable via a first sliding assembly It is movably installed on the frame, and the upper left wedge block 7 and the upper right wedge block 8 are movably connected to the lower left wedge block 5 and the lower right wedge block 6 via the second sliding assembly respectively. The upper left wedge block 7 and the upper right wedge block 8 are movably connected to the frame via the lifting sliding assembly respectively. The bottom of the top connecting block 9 is connected to the top of the upper left wedge block 7 and the upper right wedge block 8 respectively. The top connecting block 9 is used to connect an external mechanical structure; the wedge surface of the upper left wedge block 7 is parallel to the wedge surface of the lower left wedge block 5, and the wedge surface of the upper right wedge block 8 is parallel to the wedge surface of the lower right wedge block 6. The wedge surface of the upper left wedge block 7 gradually tilts upward from left to right, and the wedge surface of the upper right wedge block 8 gradually tilts downward from left to right.

[0036] In this embodiment, the drive motor 1 is preferably a servo motor, and the upper left wedge 7 and the upper right wedge 8 are respectively located at the two ends of the top connecting block 9. There is a certain distance between the upper left wedge 7 and the upper right wedge 8 so that there is enough space for the lower left wedge 5 and the lower right wedge 6 to move closer to each other, thereby increasing the travel distance of the top connecting block 9. The tilted coordination of the upper left wedge 7 and the lower left wedge 5, and the upper right wedge 8 and the lower right wedge 6 allows the horizontal drive of the bidirectional screw 2 to achieve the vertical lifting movement of the top connecting block 9. The left and right wedge surfaces are not parallel, which can play a role in mutual limitation. Even if the drive motor 1 stops rotating, the top connecting block 9 will not slide down due to gravity, so that the external mechanical structure connected to the top connecting block 9 can maintain the required height position.

[0037] When the adjustment mechanism needs to be raised, the driving motor 1 drives the bidirectional screw 2 to rotate forward through the transmission assembly, and the left screw nut 3 drives the lower left wedge 5 to move to the left along the first sliding assembly, and the right screw nut 4 drives the lower right wedge 6 to move to the right along the first sliding assembly. When the lower left wedge 5 moves to the left, the upper left wedge 7 is moved upward along the lifting sliding assembly through the second sliding assembly. When the lower right wedge 6 moves to the right, the upper right wedge 8 is moved upward along the lifting sliding assembly through the second sliding assembly, thereby moving the top connecting block 9 and the external mechanical structure connected to it upward; when the external mechanical structure reaches the required height, the driving motor 1 stops rotating, the bidirectional screw 2 stops rotating, the left screw nut 3 and the right screw nut 4 stop moving, and the upper left wedge 7 and the upper right wedge 8 are supported and limited by the lower left wedge 5 and the lower right wedge 6 respectively, so that they will not slide downward, so that the top connecting block 9 and the external mechanical structure connected to it can remain at this height position unchanged.

[0038] When the adjustment mechanism needs to be lowered, the drive motor 1 drives the bidirectional screw 2 to reverse through the transmission assembly, the left screw nut 3 drives the lower left wedge 5 to move to the right along the first sliding assembly, and the right screw nut 4 drives the lower right wedge 6 to move to the left along the first sliding assembly. When the lower left wedge 5 moves to the right, the upper left wedge 7 is moved downward along the lifting sliding assembly through the second sliding assembly. When the lower right wedge 6 moves to the left, the upper right wedge 8 is moved downward along the lifting sliding assembly through the second sliding assembly, thereby moving the top connecting block 9 and the external mechanical structure connected to it downward.

[0039] See also Figures 1 to 3 As shown, the frame includes a base 10, a screw fixing base 11 and a screw support base 12. The screw fixing base 11 and the screw support base 12 are respectively mounted on the base 10, and the two ends of the bidirectional screw 2 are rotatably mounted on the screw fixing base 11 and the screw support base 12. In this embodiment, the screw fixing base 11 and the screw support base 12 are arranged at the two ends of the front side of the base 10, and the two ends of the bidirectional screw 2 are supported by the screw fixing base 11 and the screw support base 12. The left screw nut 3 and the right screw nut 4 are located between the screw fixing base 11 and the screw support base 12.

[0040] See also Figures 1 to 3 As shown, the transmission assembly includes a harmonic reducer 13, a reducer connector 14 and a coupling 15. The drive motor 1 is fixedly connected to the harmonic reducer 13 via the reducer connector 14, and the harmonic reducer 13 is connected to the bidirectional screw 2 via the coupling 15. In this embodiment, the reducer connector 14 is used to be fixedly connected to the frame to install the harmonic reducer 13 and the drive motor 1.

[0041] In some other embodiments, the harmonic reducer 13 can be replaced by other types of reducers, such as a gear reducer, a planetary gear reducer, a worm gear reducer, etc., according to the required height adjustment resolution.

[0042] See also Figures 1 to 3 As shown, in this embodiment, the frame also includes a reducer support seat 16, which is fixedly installed on one end of the base 10 close to the drive motor 1, and the reducer connector 14 is fixedly installed on the reducer support seat 16, so that the harmonic reducer 13 maintains the same axis as the bidirectional screw 2 and the drive motor 1.

[0043] See also Figures 1 to 2 As shown, the lifting and sliding assembly includes a left cross roller slide 17, a right cross roller slide 18, a left slide connecting plate 19 and a right slide connecting plate 20. One side of the left cross roller slide 17 is fixedly connected to one side of the left slide connecting plate 19, and the other side of the left slide connecting plate 19 is fixedly connected to the left end of the upper left wedge 7; one side of the right cross roller slide 18 is fixedly connected to one side of the right slide connecting plate 20, and the other side of the right slide connecting plate 20 is fixedly connected to the right end of the upper right wedge 8. When the driving motor 1 drives the bidirectional screw 2 to rotate, the left and right screw nuts 4 respectively drive the left and right lower wedge blocks 6 to move, and the left and right lower wedge blocks 6 move horizontally relative to the left and right upper wedge blocks 8 respectively. Due to the cooperation of the wedge surfaces between the upper and lower wedge blocks, during the horizontal movement of the left and right lower wedge blocks 6, the left and right upper wedge blocks 8 will move in the vertical direction along the left and right cross roller slides 18. The left and right cross roller slides 18 are used as sliding components connected to the frame, which realizes the active connection relationship between the top connecting block 9 and the frame, and improves the lifting and lowering stability of the top connecting block 9. In this embodiment, the left cross roller slide 17 and the right cross roller slide 18 are used to achieve stable movement of the upper left wedge 7 and the upper right wedge 8 in the vertical direction, thereby improving the height adjustment accuracy of the top connecting block 9 and the external mechanical structure connected thereto; the left and right cross roller slides 18 are connected to the left and right upper wedges 8 respectively through the left and right slide connecting plates 20, thereby increasing the distance between the left and right upper wedges 8 and the left and right cross roller slides 18 respectively, thereby avoiding interference with the movement of the left and right lower wedges 6.

[0044] In some other embodiments, the left and right cross roller slides 18 may be replaced by a combination of vertical guide rails and sliders.

[0045] See also Figures 1 to 3As shown, the frame also includes a left slide support plate 21 and a right slide support plate 22 respectively mounted on both ends of the base 10. The other side of the left cross roller slide 17 is fixedly mounted on the right side of the left slide support plate 21, and the other side of the right cross roller slide 18 is fixedly mounted on the left side of the right slide support plate 22. In this embodiment, the left slide support plate 21 and the right slide support plate 22 are both arranged on the rear side of the base 10 and located outside the two ends of the first sliding assembly to support the installation of the left and right cross roller slides 18, so that there is a certain height distance between the left and right upper wedge blocks 8 and the top connecting block 9 and the base 10, so that they can be raised and lowered in the vertical direction.

[0046] See also Figures 1 to 2 As shown, in this embodiment, the first sliding assembly includes a first left guide rail 23, a first left slider 24, a first right guide rail 25, and a first right slider 26. The first left guide rail 23 and the second left guide rail 27 are located in a straight line and are mounted on the base 10. The first left slider 24 is slidably mounted on the first left guide rail 23. The lower left wedge 5 is fixedly connected to the top of the first left slider 24. The first right slider 26 is slidably mounted on the first right guide rail 25. The lower right wedge 6 is fixedly connected to the top of the first right slider 26. The first sliding assembly is a horizontal sliding assembly. There is a certain distance between the first left guide rail 23 and the first right guide rail 25. The lengths of the first left slider 24 and the first right slider 26 are respectively smaller than the lengths of the lower left wedge 5 and the lower right wedge 6. The lengths of the lower left wedge 5 and the lower right wedge 6 are respectively smaller than the lengths of the first left guide rail 23 and the first right guide rail 25. This prevents the lower left wedge 5 and the lower right wedge 6 from colliding and interfering with each other when they approach each other. When the bidirectional screw 2 rotates, the left and right screw nuts 4 are driven by the bidirectional screw 2 to move in opposite directions, thereby driving the first left slider 24 and the first right slider 26 to slide in opposite directions, so as to drive the lower left wedge block 5 and the lower right wedge block 6 to move in opposite directions at the same time, and finally realize that the upper left wedge block 7, the upper right wedge block 8 and the top connecting block 9 can be raised and lowered in the vertical direction.

[0047] See also Figures 1 to 2As shown, in this embodiment, the second sliding assembly includes a second left guide rail 27, a second left slider 28, a second right guide rail 29 and a second right slider 30. The second left guide rail 27 is fixedly mounted on the top of the lower left wedge block 5, the second left slider 28 is slidably connected to the second left guide rail 27 and fixedly connected to the bottom of the upper left wedge block 7, the second right guide rail 29 is fixedly mounted on the top of the lower right wedge block 6, and the second right slider 30 is slidably connected to the second right guide rail 29 and fixedly connected to the bottom of the upper right wedge block 8. The second sliding assembly is an inclined sliding assembly. The inclination angle of the second left guide rail 27 is the same as the wedge surface angle of the lower left wedge block 5, and the inclination angle of the second right guide rail 29 is the same as the wedge surface angle of the lower right wedge block 6. Since the inclination directions of the second left guide rail 27 and the second right guide rail 29 are different, the moving directions of the left screw nut 3 and the right screw nut 4 are opposite, and they limit each other. When the drive motor 1 no longer rotates, that is, when the enable is disconnected, the left and right upper wedge blocks 8 and the top connecting block 9 will not slide down due to gravity, and will remain at the adjusted height position.

[0048] In some other embodiments, the first sliding assembly and the second sliding assembly can be replaced with cross roller guides to improve the accuracy of the mechanism according to the accuracy requirements.

[0049] See also Figure 2 As shown, in this embodiment, the first sliding assembly also includes four slider limit blocks 31, and the four slider limit blocks 31 are respectively arranged at the two ends of the first left guide rail 23 and the first right guide rail 25. The slider limit blocks 31 are used to slide and limit the first left slider 24 and the first right slider 26 to prevent the first left slider 24 from separating from the first left guide rail 23 and the first right slider 26 from separating from the first right guide rail 25, thereby ensuring the stability and reliability of the high-precision height adjustment mechanism.

[0050] See also Figures 1 to 3 As shown, in this embodiment, two nut connecting blocks 32 are further included. The left lead screw nut 3 is fixedly connected to the lower left wedge block 5 via one nut connecting block 32, and the right lead screw nut 4 is fixedly connected to the lower right wedge block 6 via the other nut connecting block 32. The left lead screw nut 3 is fixedly connected to the lower left wedge block 5, and the right lead screw nut 4 is fixedly connected to the lower right wedge block 6 via the nut connecting blocks 32, so that the lower left wedge block 5 and the lower right wedge block 6 can move stably with the left lead screw nut 3 and the right lead screw nut 4, and will not interfere with the rotation of the bidirectional lead screw 2.

[0051] The high-precision height adjustment mechanism can be used for height adjustment when installed horizontally. In some other embodiments, it can also be used for horizontal position adjustment in vertical installation scenarios.

[0052] This high-precision height adjustment mechanism can be applied to external mechanism devices that are long or have a relatively large length-to-width ratio, and has the advantages of taking up little space. For example, if it is matched with an external mechanism device that is square or has a length-to-width ratio close to 1, or two synchronously moving long or relatively large length-to-width external mechanism devices, it can be considered to simultaneously add a set of height adjustment modules on the other side of the bidirectional screw 2 to ensure that the two sets of height adjustment modules are symmetrical relative to the bidirectional screw 2, and adjust the structure of the two nut connection blocks 32 connected to the height adjustment modules.

[0053] In some other embodiments, feedback devices such as grating scales and position sensors can be added to the lower left wedge block 5, the lower right wedge block 6, the top connecting block 9, etc., and a suitable control system can be used to control the motor input to further improve the overall accuracy of the mechanism.

[0054] In summary, the present invention drives the bidirectional screw 2 through a servo motor, the bidirectional screw 2 drives the left screw nut 3 and the right screw nut 4 to move in opposite directions, the left screw nut 3 drives the lower left wedge 5, and the right screw nut 4 drives the lower right wedge 6 to move in opposite directions, the lower left wedge 5 and the lower right wedge 6 respectively lift the upper left wedge 7 and the upper right wedge 8, thereby driving the top connecting block 9 to move upward or downward, thereby realizing high-precision height adjustment of the external mechanical structure connected to the top connecting block 9:

[0055] Advantage 1: This high-precision height adjustment mechanism makes up for the disadvantage that the mechanism cannot maintain its posture when the linear motor is disconnected. In addition, compared with the solution of linear motor and servo motor combined with screw direct drive, the design of the present invention provides a larger transmission ratio, so that the entire mechanism has a smaller resolution in height adjustment. The selection of a suitable harmonic reducer 13 reduction ratio, screw pitch and wedge block size can enable the mechanism to achieve nanometer-level resolution;

[0056] Advantage 2: This high-precision height adjustment mechanism is suitable for the field of high-precision height adjustment within the millimeter adjustment range and can be widely used in the field of precision mechanical engineering;

[0057] Advantage 3: The high-precision height adjustment mechanism has a simple structure, high positioning accuracy and repeat positioning accuracy, and the size and structural parameters of the mechanism can be flexibly adjusted according to the mechanical device it is used with.

[0058] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A high-precision height adjustment mechanism, characterized in that: include: A frame, a driving motor (1), a bidirectional lead screw (2), a left lead screw nut (3), a right lead screw nut (4), a left lower wedge (5), a right lower wedge (6), a left upper wedge (7), a right upper wedge (8) and a top connecting block (9), wherein the driving motor (1) is mounted on the frame and driven to connect to the bidirectional lead screw (2) via a transmission assembly, the left lead screw nut (3) and the right lead screw nut (4) are respectively threadedly connected to the two sections of the bidirectional lead screw (2), the left lower wedge (5) is driven to connect to the left lead screw nut (3), the right lower wedge (6) is driven to connect to the right lead screw nut (4), the left lower wedge (5) and the right lower wedge (6) are respectively movably mounted on the frame via a first sliding assembly, The upper wedge block (7) and the upper right wedge block (8) are respectively movably connected to the lower left wedge block (5) and the lower right wedge block (6) via a second sliding assembly, the upper left wedge block (7) and the upper right wedge block (8) are respectively movably connected to the frame via a lifting sliding assembly, the bottom of the top connecting block (9) is respectively connected to the top of the upper left wedge block (7) and the upper right wedge block (8), and the top connecting block (9) is used to connect to an external mechanical structure; the wedge surface of the upper left wedge block (7) and the wedge surface of the lower left wedge block (5) are parallel to each other, the wedge surface of the upper right wedge block (8) and the wedge surface of the lower right wedge block (6) are parallel to each other, the wedge surface of the upper left wedge block (7) gradually tilts upward from left to right, and the wedge surface of the upper right wedge block (8) gradually tilts downward from left to right; The frame includes a base (10), a screw fixing seat (11) and a screw support seat (12), the screw fixing seat (11) and the screw support seat (12) are respectively mounted on the base (10), and both ends of the bidirectional screw (2) are rotatably mounted on the screw fixing seat (11) and the screw support seat (12); The lifting sliding assembly comprises a left cross roller slide (17), a right cross roller slide (18), a left slide connecting plate (19) and a right slide connecting plate (20), one side of the left cross roller slide (17) is fixedly connected to one side of the left slide connecting plate (19), and the other side of the left slide connecting plate (19) is fixedly connected to the left end of the left upper wedge (7); one side of the right cross roller slide (18) is fixedly connected to one side of the right slide connecting plate (20), and the other side of the right slide connecting plate (20) is fixedly connected to the right end of the right upper wedge (8).

2. The high-precision height adjustment mechanism according to claim 1, characterized in that: The transmission assembly includes a harmonic reducer (13), a reducer connector (14) and a coupling (15); the drive motor (1) is fixedly connected to the harmonic reducer (13) via the reducer connector (14); and the harmonic reducer (13) is connected to the bidirectional screw (2) via the coupling (15).

3. The high-precision height adjustment mechanism according to claim 2, characterized in that: The frame further includes a reducer support seat (16), the reducer support seat (16) is fixedly mounted on one end of the base (10), and the reducer connecting member (14) is fixedly mounted on the reducer support seat (16).

4. The high-precision height adjustment mechanism according to claim 1, characterized in that: The frame further includes a left slide support plate (21) and a right slide support plate (22) respectively mounted on both ends of the base (10); the other side of the left cross roller slide (17) is fixedly mounted on the right side of the left slide support plate (21); and the other side of the right cross roller slide (18) is fixedly mounted on the left side of the right slide support plate (22).

5. The high-precision height adjustment mechanism according to claim 1, characterized in that: The first sliding assembly includes a first left guide rail (23), a first left slider (24), a first right guide rail (25) and a first right slider (26). The first left guide rail (23) and the first right guide rail (25) are located in the same straight line and are installed on the base (10). The first left slider (24) is slidably installed on the first left guide rail (23). The lower left wedge block (5) is fixedly connected to the top of the first left slider (24). The first right slider (26) is slidably installed on the first right guide rail (25). The lower right wedge block (6) is fixedly connected to the top of the first right slider (26).

6. The high-precision height adjustment mechanism according to claim 1, characterized in that: The second sliding assembly includes a second left guide rail (27), a second left slider (28), a second right guide rail (29) and a second right slider (30), wherein the second left guide rail (27) is fixedly mounted on the top of the lower left wedge block (5), the second left slider (28) is slidably connected to the second left guide rail (27) and fixedly connected to the bottom of the upper left wedge block (7), the second right guide rail (29) is fixedly mounted on the top of the lower right wedge block (6), and the second right slider (30) is slidably connected to the second right guide rail (29) and fixedly connected to the bottom of the upper right wedge block (8).

7. The high-precision height adjustment mechanism according to claim 5, characterized in that: The first sliding assembly further comprises four slider limit blocks (31), which are respectively arranged at both ends of the first left guide rail (23) and the first right guide rail (25), and the slider limit blocks (31) are used to slide and limit the first left slider (24) and the first right slider (26).

8. The high-precision height adjustment mechanism according to claim 1, characterized in that: It also includes two nut connection blocks (32), the left screw nut (3) is fixedly connected to the left lower wedge block (5) via one nut connection block (32), and the right screw nut (4) is fixedly connected to the right lower wedge block (6) via the other nut connection block (32).

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