Direct-driven rotating table

Abstract

The utility model discloses a direct-driven rotary table, which comprises an upper platform, a central shaft arranged on the upper platform, a guide assembly and a power assembly arranged on an outer shell, a shell wiring cover fixed on the side surface of the outer shell, and a wiring cover detaching body connected with the shell wiring cover through a screw; the bottom cover plate is installed at the bottom of the outer shell. The utility model relates to a direct-drive rotary table, the rotation precision of the direct-drive rotary table is mainly realized by a reading head and a grating ruler, and meanwhile, a torque motor can be matched with corresponding microstep capability, so that the precision of the drive and control environment is higher than that of the traditional drive relying on a stepping motor encoder, a worm gear and a worm by one grade; therefore, the direct-driven rotary table can meet the requirement of a high-precision use environment. A transmission structure relying on a worm gear and a worm exists, a return clearance and a repeated positioning error exist, and compared with a direct-drive rotating table in which the driving force of a torque motor is directly transmitted to a center shaft, the response speed of the product is higher; meanwhile, the rotating speed of the direct-drive rotating table is higher than that of a conventional rotating table.

Description

Technical Field

[0001] The utility model relates to the technical field of motor production, in particular to a direct-drive rotary table. Background Art

[0002] With the continuous advancement of direct drive technology, direct drive rotary tables will gradually replace the "motor + worm gear" rotary tables widely used in scientific research and industry due to their high speed, high precision, and high load-bearing characteristics. The direct drive rotary tables currently launched include iron core motors, ironless motors, incremental grating rulers and other technologies. With their one order of magnitude higher precision, speed and more beautiful appearance design, they are likely to replace the traditional worm gear structure rotary tables. How to achieve a small size, high precision, and fast response direct drive rotary table is a problem that needs to be solved in the current precision motion field. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a direct-drive rotary table.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] The utility model discloses a direct-drive rotary table, comprising an upper platform, an outer shell, a central axis, a shell wiring cover, a wiring cover split body, a bottom cover plate, a power assembly, a guide assembly, and a reading head grating ruler assembly, wherein the central axis is arranged on the upper platform, the guide assembly and the power assembly are both arranged on the outer shell, the reading head grating ruler assembly comprises a reading head mounting plate, a reading head, a grating ruler, a zero-position baffle, and a photoelectric limit switch, wherein the reading head mounting plate is fixed on the outer shell, the reading head is mounted on the reading head mounting plate, the grating ruler is mounted on the bottom of the central axis, the zero-position baffle is fixed on the central axis, the photoelectric limit switch is fixed on the inside of the outer shell, the shell wiring cover is fixed on the side of the outer shell, and the wiring cover split body is connected to the shell wiring cover by screws; and the bottom cover plate is mounted on the bottom of the outer shell.

[0006] As a preferred technical solution of the utility model, the power assembly includes: a motor pressure ring and a direct-drive motor, and the direct-drive motor is fixed to the outer shell through the motor pressure ring.

[0007] As a preferred technical solution of the utility model, the direct drive motor includes: a motor stator and a motor rotor. The motor stator is fixed to the outer shell through the motor pressure ring, and the motor rotor is fixedly connected to the central shaft through screws.

[0008] As a preferred technical solution of the utility model, the guide assembly includes an upper bearing cover, an upper bearing, an upper bearing lower pressure ring, a lower bearing cover, a lower bearing, and a lower cover. The upper bearing is fixed to the outer shell by the upper bearing cover. The center shaft is fixedly connected to the upper bearing lower pressure ring by screws to clamp the upper bearing. The lower bearing is arranged in the outer shell. The lower bearing cover and the lower cover are at the upper and lower ends of the lower bearing and are fixed in the outer shell by screws to limit the lower bearing.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0010] The utility model is a direct-drive rotary table. The volume of the direct-drive rotary table is smaller because its motor is installed inside, while the motor of the traditional rotary table is installed outside. Therefore, the external dimensions of the direct-drive rotary table are smaller than the length and width of the traditional rotary table, and the space occupied in the laboratory or in industrial products is smaller. Secondly, the rotation accuracy of the direct-drive rotary table is mainly achieved by the reading head and the grating ruler, and the torque motor can also match the corresponding micro-stepping capability. Such a driving control environment is one level higher than the traditional precision relying on the stepper motor encoder and the worm gear plus worm gear transmission, so the direct-drive rotary table can meet the high-precision use environment. In addition, the transmission structure relying on the worm gear plus worm gear has a return gap and repeated positioning error. Compared with the direct-drive rotary table in which the driving force of the torque motor is directly transmitted to the center axis, the response speed of this product is faster; at the same time, the rotation speed of the direct-drive rotary table is faster than that of the conventional rotary table. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0014] Figure 3 It is one of the overall cross-sectional views of the utility model;

[0015] Figure 4 This is the second overall cross-sectional view of the utility model;

[0016] In the figure: 1, upper platform; 2, outer shell; 3, central axis; 4, shell wiring cover; 5, wiring cover split body; 6, bottom cover; 701, motor pressure ring; 702, motor stator; 703, motor rotor; 801, upper bearing pressure cover; 802, upper bearing; 803, upper bearing lower pressure ring; 804, lower bearing pressure cover; 805, lower bearing; 806, lower pressure cover; 901, reading head mounting plate; 902, reading head; 903, grating ruler; 904, zero position baffle; 905, photoelectric limit switch. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0018] In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model; the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] Figure 1-4The utility model provides a direct-drive rotary table, including an upper platform 1, an outer shell 2, a central axis 3, a shell wiring cover 4, a wiring cover split body 5, a bottom cover plate 6, a power assembly 7, a guide assembly 8, and a reading head grating ruler assembly 9. The central axis 3 is arranged at the lower part of the upper platform 1, the guide assembly 8 and the power assembly 7 are both arranged on the outer shell 2, and the reading head grating ruler assembly 9 includes a reading head mounting plate 901, a reading head 902, a grating ruler 903, a zero position baffle 904, and a photoelectric limit switch 905, wherein the reading head mounting plate 901 is fixed on the outer shell 2, the reading head 902 is mounted on the reading head mounting plate 901, the grating ruler 903 is mounted on the bottom of the central axis 3, the zero position baffle 904 is fixed on the central axis 3, and the photoelectric limit switch 905 is fixed inside the outer shell 2. The shell wiring cover 4 is fixed on the side of the outer shell 2, and the wiring cover split body 5 is connected to the shell wiring cover 4 by screws; the bottom cover plate 6 is mounted on the bottom of the outer shell 2.

[0020] In this embodiment, firstly, the device obtains angle data by reading the change data of the grating ruler 903 through the reading head 902. Secondly, the central axis 3 of the device is directly connected to the motor rotor 703. When the motor rotor 703 rotates, the torque of rotation is directly transmitted to the central axis 3 and the upper platform 1. At the same time, the positioning of the central axis 3 of this product is carried out by using two bearings, the upper bearing 802 and the lower bearing 805, so as to provide stable rotation ability; in order to facilitate the installation of the aviation socket, the shell wiring cover 4 and the wiring cover split body 5 are added to the side of the outer shell 2; in order to facilitate the installation and observation of the grating ruler 903, the bottom cover plate 6 is split out at the bottom of the outer shell 2.

[0021] Specifically, the reading head 902 in the reading head grating ruler assembly 9 has a single-field scanning technology, and there are incremental lines on the cylindrical surface of the grating ruler 903. After the device is powered on, the reading head 902 can read the position information on the grating ruler 903. When the direct drive motor rotates the motor rotor 703, as the central shaft 3 rotates, the reading head 902 can read and feedback the corresponding angle change value on the grating ruler 903, so that a certain angle can be rotated as required. If it is necessary to return to the zero position of the device, start the device, the central shaft 3 rotates, and the zero position baffle 904 also rotates. When the zero position baffle 904 blocks the light beam of the photoelectric limit switch 905, the motor stops and reaches the pre-set zero position.

[0022] Specifically, the power assembly 7 includes: a motor pressure ring 701, a direct drive motor, and the direct drive motor is fixed to the outer shell 2 through the motor pressure ring 701. More specifically, the direct drive motor includes: a motor stator 702 and a motor rotor 703, and the motor stator 702 is fixed to the outer shell 2 through the motor pressure ring 701, and the motor rotor 703 is fixedly connected to the central shaft 3 through screws. After the device is started, the controller energizes the motor stator 702, and under the driving force of the magnetic field, the motor rotor 703 starts to rotate, and then the central shaft 3 and the upper platform 1 start to rotate.

[0023] Specifically, the guide assembly 8 includes an upper bearing cover 801, an upper bearing 802, an upper bearing lower pressure ring 803, a lower bearing cover 804, a lower bearing 805, and a lower pressure cover 806. The upper bearing 802 is fixed to the outer shell 2 by the upper bearing cover 801. The central shaft 3 is fixedly connected with the upper bearing lower pressure ring 803 by screws to clamp the upper bearing 802. The lower bearing 805 is arranged in the outer shell 2. The lower bearing cover 804 and the lower pressure cover 806 are at the upper and lower ends of the lower bearing 805 and are fixed in the outer shell 2 by screws to limit the lower bearing 805. The central shaft 3 passes through the upper bearing 802 and the lower bearing 805. At the same time, the central shaft 3 is constrained from moving in the XYZ direction and can only rotate along the central axis, so the guiding and positioning functions can be met.

[0024] Specifically, the housing wiring cover 4 and the wiring cover split body 5 are used to fix three GX16 aviation sockets and can be used to connect to a dedicated control cabinet.

[0025] The working principle of this utility model:

[0026] The working principle of a direct-drive rotary table is to transmit the motor drive torque directly to the rotating parts, while accurately controlling the rotary table movement through feedback information provided by sensors.

[0027] The load or optical instrument is installed on the upper platform 1, the power supply and the corresponding data signal are turned on, and then the control cabinet and the host computer software are started. At this time, the direct-drive rotary table starts to be powered on. After the angle to be rotated is input in the host computer software, the direct-drive rotary table starts to execute the corresponding command. First, the reading head 902 in the reading head grating ruler assembly 9 starts to read the position information of the grating ruler 903 at that time, and transmits the electrical signal to the board card in the control cabinet. After the board card is processed, the electrical signal is transmitted to the driver. The driver starts to control the motor stator 702 in the power assembly 7. After the electromagnetic effect, the motor rotor 703 starts to rotate the angle, and the driving force is transmitted to the top optical instrument through the central axis 3 and the upper platform 1. During the operation, the reading head 902 repeatedly obtains the information of the angle position change, and quickly feeds back to the board card in the control cabinet. When the value of the angle change meets the angle value set in the host computer software, the board card sends a signal to the driver, and the driver executes the stop instruction, and finally the upper platform 2 reaches the pre-set rotation angle value. The positioning accuracy of the rotation angle of this device is determined by the precise position reading capability of the reading head grating scale assembly and the high controllability of the torque motor.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A direct-drive rotary table, characterized in that: The invention comprises an upper platform (1), an outer shell (2), a central axis (3), a shell wiring cover (4), a wiring cover split body (5), a bottom cover plate (6), a power assembly (7), a guide assembly (8), and a reading head grating ruler assembly (9), wherein the central axis (3) is arranged at the lower part of the upper platform (1), the guide assembly (8) and the power assembly (7) are both arranged on the outer shell (2), and the reading head grating ruler assembly (9) comprises a reading head mounting plate (901), a reading head (902), a grating ruler (903), a zero position baffle (904), a light guide assembly (905), a light guide assembly (906), a light guide assembly (907), a light guide assembly (908), a light guide assembly (909), a light guide assembly (910), a light guide assembly (911), a light guide assembly (912), a light guide assembly (913), a light guide assembly (914), a light guide assembly (915), a light guide assembly (916), a light guide assembly (917), a light guide assembly (918), a light guide assembly (919), a light guide assembly (919), a light guide assembly (919), a light guide assembly (911), a light guide assembly (912), a light guide assembly (913), a light guide assembly (914), a light guide assembly (915), a light guide assembly (916 ...9), a light guide assembly (919 An electric limit switch (905), wherein a reading head mounting plate (901) is fixed on an outer shell (2), a reading head (902) is mounted on the reading head mounting plate (901), a grating ruler (903) is mounted on the bottom of a central shaft (3), a zero position baffle (904) is fixed on the central shaft (3), a photoelectric limit switch (905) is fixed inside the outer shell (2), a shell wiring cover (4) is fixed on the side of the outer shell (2), and a wiring cover split body (5) is connected to the shell wiring cover (4) by screws; and a bottom cover plate (6) is mounted on the bottom of the outer shell (2).

2. The direct-drive rotary table according to claim 1, characterized in that: The power assembly (7) comprises: a motor pressing ring (701) and a direct-drive motor, and the direct-drive motor is fixed to the outer shell (2) via the motor pressing ring (701).

3. The direct-drive rotary table according to claim 2, characterized in that: The direct drive motor comprises: a motor stator (702) and a motor rotor (703); the motor stator (702) is fixed to the outer shell (2) via the motor pressure ring (701); and the motor rotor (703) is fixedly connected to the central shaft (3) via screws.

4. The direct-drive rotary table according to claim 1, characterized in that: The guide assembly (8) comprises an upper bearing cover (801), an upper bearing (802), an upper bearing lower pressure ring (803), a lower bearing cover (804), a lower bearing (805), and a lower pressure cover (806); the upper bearing (802) is fixed to the outer shell (2) by the upper bearing cover (801); the central shaft (3) and the upper bearing lower pressure ring (803) are fixedly connected by screws to clamp the upper bearing (802); the lower bearing (805) is arranged in the outer shell (2); the lower bearing cover (804) and the lower pressure cover (806) are located at the upper and lower ends of the lower bearing (805) and are fixed in the outer shell (2) by screws to limit the position of the lower bearing (805).

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