High-precision heavy-load AC shaft

Abstract

The utility model discloses a high-precision heavy-load AC shaft, and the shaft comprises an A shaft assembly which comprises two A shaft torque motors which are horizontally, coaxially and oppositely arranged; the fixing assembly is connected with a stator of each A-axis torque motor; the C-axis assembly comprises a C-axis torque motor and a C-axis shell, the C-axis torque motor is vertically arranged between the two A-axis torque motors, the C-axis shell is arranged on the outer side of the C-axis torque motor in a sleeving mode, a stator of the C-axis torque motor is connected with the C-axis shell, and a rotor of each A-axis torque motor is connected with the outer side wall of the C-axis shell. And a transmission structure driven by a servo motor is not adopted, so that the driving precision is improved, the size of the structure is greatly reduced, and installation and application in a limited space can be fully met.

Description

Technical Field

[0001] The utility model relates to the technical field related to precision machining, precision testing and measurement, and more specifically, to a high-precision, high-load AC shaft. Background Art

[0002] Due to the characteristics of short duration, extremely high peak power, and strong focusing ability of femtosecond laser pulses, femtosecond lasers have unique advantages in laser processing, which can achieve non-thermal cold treatment of almost all materials, and obtain ultra-fine, low-damage, and spatial 3D processing and processing structures. These unique advantages of femtosecond lasers have led to their wide application in material micro-processing, micro-nano structure production, photonic devices, high-density storage, medical and bioengineering, etc.

[0003] In order to give full play to the ultra-fine processing characteristics of femtosecond laser processing, a high-precision, high-stability motion platform is required to provide movement and rotation in all directions. For ultra-fine processing of some curved surface structures, a high-precision AC axis structure is required.

[0004] However, the existing AC axis structures are mostly cradle structures, which are large in size, heavy in weight, and occupy a large installation space. The orthogonality of the A-axis and the C-axis is difficult to ensure, so the accuracy is not high and the applicability is poor, which is difficult to meet the needs of industry applications. For example, the utility model patent with application number 2018106092556 and patent name is "A dual rotary axis precision workbench". Utility Model Content

[0005] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described below.

[0006] Another object of the utility model is to provide a high-precision and large-load AC shaft, which reduces the weight of the AC shaft, reduces the volume of the AC shaft, and improves the movement accuracy of the AC shaft.

[0007] In order to achieve these purposes and other advantages according to the utility model, a high-precision large-load AC axis is provided, the AC axis includes an A axis rotating around the X axis and a C axis rotating around the Z axis, including:

[0008] A-axis assembly, which includes:

[0009] Two A-axis torque motors are horizontally coaxial and arranged opposite to each other;

[0010] A fixed assembly connected to the stator of each A-axis torque motor;

[0011] The C-axis assembly comprises:

[0012] The C-axis torque motor is vertically arranged between the two A-axis torque motors.

[0013] The C-axis housing is sleeved on the outside of the C-axis torque motor, the stator of the C-axis torque motor is connected to the C-axis housing, and the mover of each A-axis torque motor is connected to the outer side wall of the C-axis housing.

[0014] Preferably, the fixing assembly includes two A-axis housings, the two A-axis housings are arranged in one-to-one correspondence with the two A-axis torque motors, each A-axis housing is sleeved on the outside of the corresponding A-axis torque motor, and the stator of the A-axis torque motor is connected to the A-axis housing;

[0015] The outer bottom of the A-axis housing is provided with a base.

[0016] Preferably, the A-axis housing is cylindrical, with an A-axis core shaft provided inside it. The A-axis core shaft is coaxially fixedly sleeved inside the A-axis torque motor mover. The end of the A-axis core shaft close to the C-axis housing is fixedly connected to the C-axis housing, and the A-axis core shaft is hollow inside.

[0017] Preferably, an A-axis shaft is sleeved with an A-axis ring, the A-axis ring is located between the A-axis torque motor and the C-axis housing, and the A-axis ring is embedded in the A-axis housing; the A-axis shaft is also sleeved with a first A-axis ring retaining ring and a second A-axis ring retaining ring, the first A-axis ring retaining ring is threadedly connected to the A-axis shaft and presses the inner ring of the A-axis ring, and the second A-axis ring retaining ring is threadedly connected to the A-axis housing and presses the outer ring of the A-axis ring.

[0018] Preferably, an A-axis circular grating is provided at the end of the A-axis core shaft away from the A-axis collar, and the A-axis circular grating is coaxially fixed to the A-axis core shaft by screws;

[0019] An A-axis joint fixing frame is fixedly connected to the A-axis housing, an A-axis reading head mounting plate is fixedly connected to the A-axis joint fixing frame, the A-axis reading head mounting plate is connected to the A-axis reading head, and the A-axis reading head corresponds to the A-axis circular grating.

[0020] Preferably, the C-axis housing includes a vertical cylinder and two horizontal cylinders, the two horizontal cylinders are symmetrically connected on both sides of the vertical cylinder, the axis of the vertical cylinder is perpendicular to the axes of the two horizontal cylinders, the vertical cylinder is hollow inside, and the C-axis torque motor is coaxially arranged inside, the C-axis core shaft is coaxially fixed inside the C-axis torque motor rotor, the two horizontal cylinder end faces are coaxially connected to the two A-axis core shafts respectively, and the C-axis core shaft is hollow inside.

[0021] Preferably, a C-axis ring, a first C-axis ring retaining ring and a second C-axis ring retaining ring are sleeved on the C-axis core shaft, the first C-axis ring retaining ring is threadedly connected to the C-axis core shaft and presses the inner ring of the C-axis ring, the C-axis ring is also embedded in the C-axis housing, and the second C-axis ring retaining ring is threadedly connected to the C-axis housing and presses the outer ring of the C-axis ring.

[0022] Preferably, a C-axis grating mounting plate is provided at one end of the C-axis core shaft, a C-axis circular grating is provided on the side of the C-axis grating mounting plate away from the C-axis core shaft, and the other side is connected to the C-axis core shaft, a C-axis reading head is provided at a position corresponding to the C-axis circular grating, the C-axis reading head is connected to the C-axis reading head mounting plate by screws, and the C-axis reading head mounting plate is fixedly connected to the C-axis housing by screws.

[0023] Preferably, the top of the C-axis housing is open, and a C-axis load plate is horizontally provided thereon, and the C-axis load plate is fixedly connected to the C-axis core shaft.

[0024] The utility model at least has the following beneficial effects:

[0025] Each rotating shaft of the utility model is driven by a direct-drive torque motor, which has zero cogging effect and no transmission structure when driven by a servo motor, thereby improving the driving accuracy and greatly reducing the size of the structure, and can fully meet the installation application in a limited space.

[0026] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of a high-precision, high-load AC shaft according to one of the technical solutions of the utility model;

[0028] Figure 2 This is a cross-sectional view of a high-precision, high-load AC shaft according to one of the technical solutions of the present utility model;

[0029] Figure 3 This is a schematic structural diagram of a C-axis housing according to one of the technical solutions of the utility model.

[0030] Figure markings: A-axis housing 1, A-axis torque motor 2, A-axis core shaft 3, A-axis cover plate 14, electrical connector 5, A-axis connector mounting plate 6, A-axis circular grating 7, A-axis reading head 8, A-axis reading head mounting plate 9, A-axis connector fixing frame 10, A-axis shaft ring 11, first A-axis ring retaining ring 12, second A-axis ring retaining ring 13, A-axis dust cover 14, C-axis housing 15, C-axis core shaft 16, C-axis reading head mounting plate 17, C-axis circular grating 18, C-axis grating mounting plate 19, C-axis bottom cover 20, C-axis torque motor 21, C-axis shaft ring 22, C-axis load plate 23, first C-axis ring retaining ring 24, second C-axis ring retaining ring 25, A-axis cover plate 226. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0032] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0033] like Figure 1-2 As shown, the utility model provides a high-precision and large-load AC axis, the AC axis includes an A axis rotating around an X axis and a C axis rotating around a Z axis, including:

[0034] A-axis assembly, which includes:

[0035] Two A-axis torque motors 2, which are horizontally coaxial and oppositely arranged;

[0036] A fixed component connected to the stator of each A-axis torque motor 2;

[0037] The C-axis assembly comprises:

[0038] The C-axis torque motor 21 is vertically arranged between the two A-axis torque motors 2.

[0039] The C-axis housing 15 is sleeved on the outside of the C-axis torque motor 21 , the stator of the C-axis torque motor 21 is connected to the C-axis housing 15 , and the mover of each A-axis torque motor 2 is connected to the outer side wall of the C-axis housing 15 through the A-axis core shaft.

[0040] In the above technical scheme, the present application does not limit the specific placement of the fixed component structure, and its main function is to fix the A-axis torque motor 2. The C-axis torque motor 21 can drive the AC axis to rotate around the Z axis, and the A-axis torque motor 2 can drive the AC axis to rotate around the X axis. This embodiment does not include the branch-like cradle structure in the prior art 2018106092556, which is small in size, lighter in weight, compact in structure, and occupies a small installation space. There is no interference from the cradle structure, and the orthogonality of the A-axis and the C-axis is easier to achieve and correct, so the accuracy is high and the scope of application is wider, such as a five-axis machining center, which is easy to meet the needs of various applications in the industry. After testing, the repeatability of the AC axis is within 1 arc sec, and the orthogonality of the AC axis motion axis is within 5 arc sec. Within sec; in the embodiment of the utility model, each rotating axis is driven by a direct-drive torque motor, with zero tooth slot effect and no transmission structure when driven by a servo motor, which improves the driving accuracy and greatly reduces the size of the structure, and can fully meet the installation application in a limited space; the A-axis is driven and controlled by two sets of identical structures using a gantry dual-drive method to achieve the requirements of ultra-large load and high-precision and large torque.

[0041] In another technical solution, the fixing assembly includes two A-axis housings 1, and the two A-axis housings 1 are arranged one-to-one with the two A-axis torque motors 2. Each A-axis housing 1 is sleeved on the outer side of the corresponding A-axis torque motor 2, and the stator of the A-axis torque motor 2 is connected to the A-axis housing 1; a base is provided at the outer bottom of the A-axis housing 1, and the present application does not limit the specific structure of the housing. At the same time, the stator of the A-axis torque motor 2 is bonded and fixed to the A-axis housing 1.

[0042] In another technical solution, the A-axis housing 1 is cylindrical, and an A-axis core shaft 3 is provided inside the housing. The A-axis core shaft 3 is coaxially fixedly sleeved inside the mover of the A-axis torque motor 2. The end of the A-axis core shaft 3 close to the C-axis housing 15 is fixedly connected to the C-axis housing 15, and the interior of the A-axis core shaft 3 is hollow. The A-axis housing 1 is cylindrical with open sides, and the ends of the A-axis housing 1 away from the C-axis assembly are covered with A-axis cover plates. Figure 2 There are A-axis cover plates 1 4 and A-axis cover plates 2 26, which are both connected and fixed to the A-axis joint mounting plate 6 by screws, and an A-axis dust cover 14 is provided at the other end of the A-axis housing 1; the interior of the A-axis core shaft is hollow to further reduce the weight.

[0043] In another technical solution, an A-axis shaft ring 11 is sleeved on the A-axis core shaft 3, and the A-axis shaft ring 11 is located between the A-axis torque motor 2 and the C-axis housing 15, and the A-axis shaft ring is embedded in the A-axis housing; the A-axis core shaft 3 is also sleeved with a first A-axis shaft ring retaining ring 12 and a second A-axis shaft ring retaining ring 13, the first A-axis shaft ring retaining ring 12 is threadedly connected to the A-axis core shaft 3 and presses the inner ring of the A-axis shaft ring 11, and the second A-axis shaft ring retaining ring 13 is threadedly connected to the A-axis housing 1 and presses the outer ring of the A-axis shaft ring 11. The specific arrangement method of the first A-axis shaft ring retaining ring 12 and the second A-axis shaft ring retaining ring 13 is as follows: Figure 2 As shown, the A-axis collar 11 is squeezed by the first A-axis collar retaining ring 12 and the second A-axis collar retaining ring 13, and the A-axis collar 11 is fixed to a certain extent. The A-axis collar 11 is installed as a cross roller bearing, which has greater rigidity and higher rotation accuracy than the cross roller bearing; optionally, see Figure 2 A recess is provided in the A-axis housing 1 so that the A-axis shaft ring is embedded in the A-axis housing, and a second A-axis shaft ring retaining ring 13 is provided to squeeze the A-axis shaft ring 11 .

[0044] In another technical solution, an A-axis circular grating 7 is provided at the end of the A-axis core shaft 3 away from the A-axis shaft ring 11, and the A-axis circular grating 7 is coaxially fixed to the A-axis core shaft 3 by screws, and an A-axis joint fixing frame 10 is fixed to the A-axis joint fixing frame 10, and an A-axis reading head mounting plate 9 is fixed to the A-axis reading head mounting plate 9, and the A-axis reading head mounting plate 9 is connected to the A-axis reading head 8, and the A-axis reading head 8 corresponds to the A-axis circular grating 7, and the power supply and signal lines of the two A-axis torque motors 2 and the A-axis reading head 8 are respectively connected to the electrical connectors 5 installed on their respective A-axis joint fixing frames 10; the A-axis circular grating 7 is mainly used to measure the angular displacement of rotation, and the A-axis core shaft 3 adopts the A-axis circular grating 7 and the A-axis reading head 8 as position feedback to realize closed-loop control of the structure and meet higher precision requirements; optionally, a gantry control algorithm, an A-axis circular grating 7 and an A-axis reading head 8 are used to cooperate to achieve ultra-precision positioning accuracy of the A-axis.

[0045] In another technical solution, see Figure 3The C-axis housing 15 includes a vertical column 1501 and two horizontal columns 1502. The two horizontal columns 1502 are symmetrically connected to the two sides of the vertical column 1501. The axis of the vertical column 1501 is perpendicular to the axes of the two horizontal columns 1502. The vertical column 1501 is hollow inside, and the C-axis torque motor is coaxially arranged inside. The C-axis core shaft is coaxially fixed inside the C-axis torque motor mover. The end faces of the two horizontal columns 1502 are coaxially connected to the two A-axis core shafts respectively, and the C-axis core shaft is hollow inside; that is, the C-axis housing has a special shape, and the axes of the vertical column 1501 and the horizontal column 1502 are perpendicular. , with good orthogonality; a C-axis torque motor 21 and a C-axis spindle 16 are arranged in the vertical column 1501, and the horizontal column 1502 is connected to the A-axis spindle and the A-axis torque motor, and the C-axis torque motor 21 mover is fixed to the C-axis spindle 16 by means of glue, thereby ensuring the high orthogonality of the C-axis spindle and the A-axis spindle, and can achieve significantly higher precision compared to the cradle structure; optionally, the middle part of the end face of the horizontal column 1502 is recessed inward to further reduce the weight, and a fixing hole is arranged around the edge for connection with the A-axis spindle; the C-axis spindle is hollow inside to further reduce the weight, and is convenient for slip ring integration, internal layout of optical or other structures, and the passage of cables, air pipes, optical paths, etc.; optionally, as Figure 2 As shown, the C-axis housing 15 is open at the top and the bottom, and the bottom is sealed by a C-axis bottom cover 20 .

[0046] In another technical solution, a C-axis shaft 16 is sleeved with a C-axis collar 22, a first C-axis collar retaining ring 24 and a second C-axis collar retaining ring 25, the first C-axis collar retaining ring 24 is threadedly connected to the C-axis shaft 16 and presses the inner ring of the C-axis collar 22, the C-axis collar is also embedded in the C-axis housing, the second C-axis collar retaining ring 25 is threadedly connected to the C-axis housing 15 and presses the outer ring of the C-axis collar 22, the first C-axis collar retaining ring 24 and the second C-axis collar retaining ring 25 squeeze the C-axis collar 22, and fix the C-axis collar 22 to a certain extent, and the C-axis collar 22 is installed, that is, a cross roller bearing, which has greater rigidity and higher rotation accuracy than a cross roller bearing; optionally, see Figure 2 A recess is provided in the C-axis housing 15 so that the C-axis collar is embedded in the C-axis housing, and a second C-axis collar retaining ring 25 is provided to squeeze the C-axis collar 22 .

[0047] In another technical solution, a C-axis grating mounting plate 19 is provided at one end of the C-axis core shaft 16, a C-axis circular grating 18 is provided on the side of the C-axis grating mounting plate 19 away from the C-axis core shaft 16, and the other side is connected to the C-axis core shaft 16, a C-axis reading head is provided at a position corresponding to the C-axis circular grating, the C-axis reading head is connected to the C-axis reading head mounting plate by screws, and the C-axis reading head mounting plate is fixedly connected to the C-axis housing 15 by screws; the C-axis core shaft 16 adopts the C-axis circular grating 18 and the corresponding C-axis reading head as position feedback to realize closed-loop control of the structure and meet higher precision requirements; optionally, a gantry control algorithm, an A-axis circular grating 7 and an A-axis reading head 8 are collaboratively adopted to realize ultra-precision positioning accuracy of the C-axis.

[0048] In another technical solution, the top of the C-axis housing 15 is open, and a C-axis load plate 23 is horizontally provided. The C-axis load plate 23 is fixedly connected to the C-axis core shaft 16. The present application does not limit the specific structure of the C-axis load plate 23. The power supply and signal lines of the C-axis torque motor 21 and the C-axis reading head are connected to the electrical connector 5 installed on the C-axis connector fixing frame on the C-axis housing 15. The C-axis housing 15 is also provided with a C-axis reading head mounting plate 17.

[0049] The number of devices and processing scales described here are used to simplify the description of the utility model. The application, modification and variation of the high-precision and high-load AC axis of the utility model will be obvious to those skilled in the art.

[0050] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. High-precision and high-load AC axis, the AC axis includes the A axis rotating around the X axis and the C axis rotating around the Z axis. It is characterized in that include: A-axis assembly, comprising: Two A-axis torque motors are horizontally coaxial and arranged opposite to each other; A fixed assembly connected to the stator of each A-axis torque motor; The C-axis assembly comprises: The C-axis torque motor is vertically arranged between the two A-axis torque motors. The C-axis housing is sleeved on the outside of the C-axis torque motor, the stator of the C-axis torque motor is connected to the C-axis housing, and the mover of each A-axis torque motor is connected to the outer side wall of the C-axis housing.

2. The high-precision, high-load AC shaft according to claim 1, It is characterized in that The fixing assembly includes two A-axis housings, the two A-axis housings are arranged in one-to-one correspondence with the two A-axis torque motors, each A-axis housing is sleeved on the outside of the corresponding A-axis torque motor, and the stator of the A-axis torque motor is connected to the A-axis housing; The outer bottom of the A-axis housing is provided with a base.

3. The high-precision, high-load AC shaft according to claim 2, It is characterized in that The A-axis housing is columnar, and an A-axis core shaft is provided inside it. The A-axis core shaft is coaxially fixedly sleeved inside the A-axis torque motor mover. The end of the A-axis core shaft close to the C-axis housing is fixedly connected to the C-axis housing, and the A-axis core shaft is hollow inside.

4. The high-precision, high-load AC shaft according to claim 3, It is characterized in that An A-axis collar is sleeved on the A-axis spindle, the A-axis collar is located between the A-axis torque motor and the C-axis housing, and the A-axis collar is embedded in the A-axis housing; The A-axis core shaft is also sleeved with a first A-axis ring retaining ring, which is threadedly connected to the A-axis core shaft and presses the inner ring of the A-axis ring, and the second A-axis ring retaining ring is threadedly connected to the A-axis housing and presses the outer ring of the A-axis ring.

5. The high-precision, high-load AC shaft according to claim 4, It is characterized in that An A-axis circular grating is provided at the end of the A-axis core shaft away from the A-axis collar, and the A-axis circular grating is coaxially fixed to the A-axis core shaft by screws; An A-axis joint fixing frame is fixedly connected to the A-axis housing, an A-axis reading head mounting plate is fixedly connected to the A-axis joint fixing frame, the A-axis reading head mounting plate is connected to the A-axis reading head, and the A-axis reading head corresponds to the A-axis circular grating.

6. The high-precision, high-load AC shaft according to claim 1, It is characterized in that The C-axis housing includes a vertical column and two horizontal columns, the two horizontal columns are symmetrically connected on both sides of the vertical column, the axis of the vertical column is perpendicular to the axes of the two horizontal columns, the vertical column is hollow inside, and the C-axis torque motor is coaxially arranged inside, the C-axis core shaft is coaxially fixed inside the C-axis torque motor mover, the end faces of the two horizontal columns are coaxially connected to the two A-axis core shafts respectively, and the C-axis core shaft is hollow inside.

7. The high-precision, high-load AC shaft according to claim 6, It is characterized in that The C-axis core shaft is sleeved with a C-axis ring and a first C-axis ring retaining ring, and the C-axis ring is also embedded in the C-axis housing. The first C-axis ring retaining ring is threadedly connected to the C-axis core shaft and presses the inner ring of the C-axis ring, and the second C-axis ring retaining ring is threadedly connected to the C-axis housing and presses the outer ring of the C-axis ring.

8. The high-precision, high-load AC shaft according to claim 7, It is characterized in that A C-axis grating mounting plate is provided at one end of the C-axis core shaft, a C-axis circular grating is provided on the side of the C-axis grating mounting plate away from the C-axis core shaft, and the other side is connected to the C-axis core shaft, a C-axis reading head is provided at a position corresponding to the C-axis circular grating, the C-axis reading head is connected to the C-axis reading head mounting plate by screws, and the C-axis reading head mounting plate is fixedly connected to the C-axis housing by screws.

9. The high-precision, high-load AC shaft according to claim 8, It is characterized in that The top of the C-axis housing is open, and a C-axis load plate is horizontally arranged thereon, and the C-axis load plate is fixedly connected to the C-axis core shaft.

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