Precise workbench with double rotating shafts

Abstract

The precision workbench comprises a rotary workbench capable of rotating along the B axis and a cradle body, the cradle body is arranged below the rotary workbench, and the two ends, away from the rotary workbench, of the cradle body are connected with A-axis main shafts capable of rotating along the A axis respectively; the outer edge of the A-axis main shaft is connected with a first torque motor, and the first torque motor can drive the cradle body to rotate along the A axis; a second torque motor is connected to the outer side of a rotating shaft of the rotating table and can drive the rotating table to rotate along the B axis. The double rotating shafts are arranged and are directly driven by the torque motors, so that the double rotating shafts have high positioning precision, the torque motors are built-in torque motors, other internal spaces can provide installation spaces for other parts, the internal spaces can be fully utilized, the height of the rotating table is reduced, and the rotating table is convenient to use. And the whole rotary table is more compact in structure.

Description

Technical Field

[0001] The invention relates to the technical field of five-axis machine tools, in particular to a precision workbench with double rotary axes. Background Art

[0002] Five-axis machine tools can be used to process many key parts with complex surfaces, and have become key basic equipment for the rapid development and realization of equipment manufacturing and advanced defense weapons and equipment products. The worktable with dual rotary axes is an important structural form for realizing five-axis processing. With the development of science and technology, the requirements for processing accuracy and effect are getting higher and higher, especially the requirements for processing position accuracy and dynamic accuracy are further improved.

[0003] As an important functional component for realizing multi-axis linkage, the CNC turntable can assist the A-axis spindle to complete high-precision five-sided processing. The existing CNC turntable includes a sliding base, which is slidably set on the CNC machine tool; two supports are set on the sliding base, and a swing seat is set between the two supports; the swing seat can swing back and forth on the two supports; a rotary axis is vertically set on the swing seat, and the top of the rotary axis is used as a workbench for processing parts; when the workpiece is to be processed, the workpiece is placed on the workbench, and then the sliding base is moved to the rotary axis of the machine tool. According to the processing requirements, the swing angle of the swing seat and the rotation angle of the rotary axis are adjusted to perform processing.

[0004] However, for the traditional domestic CNC turntable, the swing seat is driven by the swing shaft drive device in the support, and the rotary shaft is driven by the rotary shaft drive device; its rotary shaft drive device and swing shaft drive device generally use a servo motor to drive the worm gear to rotate through a coupling or eliminate the clearance of the gear pair, and the worm gear is generally a double-lead worm. However, this type of CNC turntable has a complex mechanical structure and the reverse clearance cannot be overcome, which makes the entire equipment structure not compact and requires extremely high manufacturing process level. After a period of use, the reverse clearance will gradually increase due to mechanical wear, and mechanical adjustment is required at any time. In addition, the relatively large transmission ratio of the worm gear also limits the speed of the CNC turntable, resulting in the speed of the CNC turntable generally being below 20 rpm. Therefore, the turntable of the worm gear is difficult to meet the high-speed and efficient processing requirements of CNC machine tools. Summary of the invention

[0005] The object of the present invention is to provide a precision workbench with dual rotary axes to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a precision workbench with two rotating axes, comprising a rotary workbench (10) capable of rotating along a B axis and a cradle body (8), wherein the rotary workbench (10) comprises a workbench bracket (11); the cradle body (8) is arranged below the rotary workbench (10) and connected to the rotary workbench (10) via the workbench bracket (11); and the two ends of the cradle body (8) away from the rotary workbench (10) are respectively connected to an A-axis spindle (7) capable of rotating along an A axis;

[0007] A first torque motor is connected to the outer edge of the A-axis main shaft (7), and the first torque motor is capable of driving the A-axis main shaft (7) to rotate so as to drive the cradle body (8) to perform a rotary motion along the A-axis;

[0008] A second torque motor is connected to the outer side of the rotating shaft (27) of the rotary table (10), and the second torque motor can drive the rotating shaft (27) to rotate so as to drive the rotary table (10) to perform a rotary motion along the B axis.

[0009] Preferably, the rotary worktable (10) comprises a worktable surface (25) and a rotating shaft (27) located below the surface (25), and the rotating shaft (27) can drive the surface (25) located above it to rotate along the B axis; a first bearing (9) is fixed at the connection between the surface (25) and the rotating shaft (27), and the rotating shaft (27) rotates in the first bearing (9).

[0010] Preferably, the rotating shaft (27) of the rotary table (10) is provided with a first step and a second step in sequence from the table top (25) downward along the central axis direction of the rotary table (10), and the first bearing (9) is installed below the first step and connected to the shell of the cradle body (8); a first clamping mechanism (12) is fixedly installed between the second step and the shell of the cradle body (8), the first clamping mechanism (12) is annular and sleeved on the rotating shaft (27), the bottom of the first clamping mechanism (12) is fixed on the first boss formed on the cradle body (8) at the bottom of the first clamping mechanism (12), and an air caliper brake block (19) is also provided on the inner side of the first clamping mechanism (12).

[0011] Preferably, a second torque motor is fixedly connected between the rotating shaft (27) below the first boss and the cradle body (8), wherein the top of the second torque motor rotor (15) is fixedly connected to the bottom of the rotor mounting seat (20), and the second torque motor stator (16) is fixed to the shell of the cradle body (8).

[0012] Preferably, the interior of the rotary table (10) is a hollow structure, the interior of the rotary table (10) includes an air pipeline, and an air path system (13) is installed inside the hollow structure of the rotary table (10), the air path system (13) includes an airtight system shaft whose top is clamped on the worktable bracket (11) and a sleeve (23) arranged between the air pipeline and the inner wall of the rotary table bracket (11), the bottom of the sleeve (23) is a circular ring structure, and the outermost side of the bottom of the circular ring-shaped sleeve (23) is connected to the shell of the cradle body (8) through a circular grating bracket (21).

[0013] Preferably, a first measuring system (14) is connected below the air pipeline via a transmission sleeve.

[0014] Preferably, a second boss is provided on the outer side of the A-axis main shaft (7), a third step is provided on the side of the second boss close to the cradle body (8), a second bearing (4) is fixed on the side of the second boss away from the cradle body (8), a first torque motor rotor (3) is provided on the side of the second shoulder away from the cradle body (8) and close to the edge of the second boss, and a first torque motor stator (2) is connected to the outer side of the first torque motor rotor (3).

[0015] Preferably, a turntable support seat (1) is installed at the bottom of the A-axis spindle (7), and the turntable support seat (1) includes an outer shell and an inner shell, and the first torque motor is installed in a cavity formed by the outer shell and the inner shell, wherein the stator (2) of the first torque motor is fixedly connected to the inner wall of the outer shell.

[0016] Preferably, a second clamping mechanism (5) is provided between the inner wall of the outer shell and the third step, and an end face sealing block (6) is provided between the bottom of the outer shell and the A-axis spindle (7).

[0017] Preferably, a second measuring system (17) is fixedly installed inside the inner shell, and the second measuring system (17) is connected to the A-axis spindle (7) via a pipeline bracket (24).

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The precision workbench of the present invention is provided with dual rotary axes, and both of the dual rotary axes are directly driven by torque motors, so that it has higher positioning accuracy, and the torque motor is a built-in torque motor. Other internal space can provide installation space for other components, which can fully utilize the internal space, reduce the height of the turntable, and make the entire turntable structure more compact.

[0020] (2) The precision workbench of the present invention can be provided with a workbench clamping assembly at the upper end of the rotary shaft, so that different types of workbenches can be replaced at the top of the rotary shaft according to processing requirements, making it convenient to swing the turntable to process different types of workpieces.

[0021] (3) The present invention installs measurement systems on the dual rotating axes respectively, which can accurately measure and position the angles of the two rotating axes, and can realize closed-loop control of the two axes, thereby completing high-precision positioning and indexing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front structural schematic diagram of the double rotary axis precision worktable of the present invention;

[0023] Figure 2 It is a schematic diagram of the rotary table structure of the double rotary axis precision table of the present invention;

[0024] Figure 3 It is a schematic diagram of the A-axis spindle structure of the A-axis of the double-rotating-axis precision worktable of the present invention.

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the double rotary precision worktable of the present invention.

[0026] In the figure: 1 / 29-turntable support seat; 2-first torque motor stator; 3-first torque motor rotor; 4-second bearing; 5-second clamping mechanism; 6-end face sealing block; 7-A-axis spindle; 8-cradle body; 9-first bearing; 10-rotary worktable; 11-worktable bracket; 12-first clamping mechanism; 13-air system; 14-first measuring system; 15-second torque motor rotor; 16-second torque motor stator; 17-second measuring system; 18-bearing pressure plate; 19-air clamp brake block; 20-rotor mounting seat; 21-circular grating bracket; 22-cradle body cover; 23-sleeve; 24-pipe bracket; 25-worktable table; 26-swing axis; 27-rotation axis / rotation axis; 28-cradle body swing seat. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figures 1 to 4As shown, this embodiment discloses a precision workbench with dual rotary axes, including a rotary table (10) capable of rotating along the B axis, the rotary table (10) cooperates with a table bracket (11) and is installed in a cradle body (8) at the bottom, and the two ends of the cradle body (8) away from the rotary table (10) are respectively connected to the A axis spindle (7) capable of rotating along the A axis; a first torque motor is connected to the outer edge of the A axis spindle (7), and the first torque motor can drive the A axis spindle (7) to rotate to drive the cradle body (8) to perform a rotary motion along the A axis; a second torque motor is connected to the outer side of the rotating shaft (27) of the rotary table (10), and the second torque motor can drive the rotating shaft (27) to rotate to drive the rotary table (10) to perform a rotary motion along the B axis. In this embodiment, the swing shaft (26) is parallel to the A axis, and the rotating shaft (27) is parallel to the B axis. The A axis and the B axis are driven by dual torque motors, which can increase the torque, thereby ensuring accuracy and rigidity.

[0029] The rotary table (10) of the present embodiment comprises a table top (25) and a rotating shaft (27) located below the table top (25), wherein the rotating shaft (27) can drive the table top (25) located above it to rotate along the B axis; a first bearing (9) is fixed at the connection between the table top (25) and the rotating shaft (27), and the rotating shaft (27) rotates in the first bearing (9); a bearing pressure plate (18) is provided between the table bracket (11) and the first clamping mechanism (12) for supporting the first bearing (9), thereby ensuring that the weight and force of the mechanical equipment can be more firmly borne at the corresponding position, thereby reducing the load on the bearing and extending the service life of the bearing.

[0030] A first step and a second step are sequentially arranged along the central axis direction of the rotary worktable (10) from the table top (25) downwards, and a first bearing (9) is installed below the first step and connected to the shell of the cradle body (8); a first clamping mechanism (12) is fixedly installed between the second step and the shell of the cradle body (8); the first clamping mechanism (12) is annular and sleeved to the rotary shaft (27); the bottom of the first clamping mechanism (12) is fixed to a first boss formed on the cradle body (8) at the bottom of the first clamping mechanism (12).

[0031] A second torque motor is fixedly connected between the rotating shaft (27) below the first boss and the cradle body (8), wherein the top of the second torque motor rotor (15) is fixedly connected to the bottom of the rotor mounting seat (20), and the second torque motor stator (16) is fixed to the shell of the cradle body (8).

[0032] The interior of the rotary table (10) is a hollow structure, and the interior of the rotary table (10) includes an air pipeline. An air path system (13) is installed inside the hollow structure of the rotary table (10). The air path system (13) includes an airtight system shaft whose top is clamped on the table bracket (11) and a sleeve (23) arranged between the air pipeline and the inner wall of the rotary table bracket (11). The bottom of the sleeve (23) is a circular ring structure, and the outermost side of the bottom of the circular ring sleeve (23) is connected to the shell of the cradle body (8) through a circular grating bracket (21).

[0033] The cradle body (8) further comprises a cradle body cover plate (22) and a cradle body swing seat (28), wherein the cradle body cover plate (22) is arranged on the lower surface of the cradle body swing seat (28). An air clamp brake block (19) is installed on the inner side of the first clamping mechanism (12), and the air clamp brake block (19) is located at the connection of the first torque motor and is used for clamping or loosening, so as to further prevent the internal structure of the cradle body (8) from being contaminated, thereby ensuring cleanliness and improving precision; the joint part of the cradle body (8) and the workbench bracket (11) adopts a double-layer seal to further improve cleanliness.

[0034] A first measuring system (14) is connected below the air pipeline via a transmission sleeve, a second measuring system (17) is fixedly installed inside the inner shell, and the second measuring system (17) is connected to the A-axis spindle (7) via a pipeline bracket (24).

[0035] A second boss is provided on the outer side of the A-axis main shaft (7); a third step is provided on the side of the second boss close to the cradle body (8); a second bearing (4) is fixed on the side of the second boss away from the cradle body (8); a first torque motor rotor (3) is provided on the side of the second boss away from the cradle body (8) and close to the edge of the second boss; and a first torque motor stator (2) is connected to the outer side of the first torque motor rotor (3).

[0036] A turntable support seat (1) is installed at the bottom of the A-axis spindle (7), and the turntable support seat (1) includes an outer shell and an inner shell. The first torque motor is installed in a cavity formed by the outer shell and the inner shell, wherein the stator (2) of the first torque motor is fixedly connected to the inner wall of the outer shell.

[0037] A second clamping mechanism (5) is provided between the inner wall of the outer shell and the third step, and an end face sealing block (6) is provided between the bottom of the outer shell and the A-axis spindle (7). Figure 4 As shown, the turntable support seat (29) and the cradle body (8) are sealed by an end face sealing block and a rotating sealing ring to ensure cleanliness.

[0038] In this embodiment, turntable support seats (29) are arranged at both ends of the cradle body (8), and a swing shaft (26) and a swing shaft motor (i.e., a first torque motor) are arranged on the turntable support seats (29); the swing shaft (26) is arranged horizontally, one end of the swing shaft (26) is connected to one end of the cradle body (8), and the swing shaft motor is connected to the swing shaft (26), and the swing shaft motor is used to drive the swing shaft (26) to rotate, so that the cradle body (8) swings around the swing shaft (26); a rotating shaft (27) is vertically arranged on the top of the cradle body (8), and the lower end of the rotating shaft (27) extends into the cradle body (8) and is connected to the rotating shaft motor (i.e., the second torque motor) in the cradle body (8); the rotating shaft motor is used to drive the rotating shaft to rotate on the cradle body (8).

[0039] The swing shaft motor of the present embodiment is a built-in torque motor, that is, the swing shaft (26) can be inserted into the swing shaft motor, so that the structure inside the entire turntable support seat (29) can be made more compact and space-saving. The swing shaft motor rotor is connected to the swing shaft (26) through the swing shaft motor connecting sleeve, which facilitates the connection between the motor and the shaft; in the prior art, the swing shaft motor rotor is generally connected to other components by bolt connection at the end, but it is not convenient to directly connect the right end of the swing shaft motor rotor to the swing shaft (26) by bolt connection, because it is not convenient to open a threaded hole on the swing shaft (26). If a threaded hole is opened, the threaded hole will pass through the right end of the entire swing shaft (26), and the threaded hole opened will be relatively long; when the swing shaft motor rotor is connected to the swing shaft through the swing shaft motor connecting sleeve, it is only necessary to open a threaded hole on the swing shaft motor connecting sleeve and connect it to the end of the swing shaft motor rotor by bolts.

[0040] The entire installation of this embodiment is based on the installation surface of the left and right turntable support seats (29) as the assembly reference. During installation, the left and right turntable support seats (29) are first fixed to the five-axis machining system by bolts, and then the torque motor stator and torque motor rotor of the A-axis installed on the turntable support seat (29) are fixedly connected to the A-axis main shaft, and then the left and right cradle arms of the cradle body (8) are fixed to the A-axis main shaft by bolts. The entire installation process is simple and easy, and this embodiment can make full use of the advantage of the large internal space of the inner rotor motor, and the inner shell and outer shell of the A-axis are arranged and installed as one body, and the A-axis turntable bearing and the A-axis measurement system are arranged inside the shell, so that the structure is compact and fully functional. The inner cavity of the B-axis rotary table (i.e., the cradle body) is arranged with an air path system to reasonably utilize the space. The B-axis torque motor rotor is fixed to the rotating shaft of the table by bolts to drive the rotary table to rotate around the center. The use of the torque motor direct drive form can reduce the intermediate transmission structure, and there is no backlash, and the torque motor can provide a large torque.

[0041] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed by the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A precision workbench with two rotating axes, characterized in that: The invention comprises a rotary table (10) and a cradle body (8) which can rotate along the B axis, wherein the rotary table (10) comprises a table bracket (11); the cradle body (8) is arranged below the rotary table (10) and is connected to the rotary table (10) via the table bracket (11); and the two ends of the cradle body (8) which are away from the rotary table (10) are respectively connected to an A axis spindle (7) which can rotate along the A axis; A first torque motor is connected to the outer edge of the A-axis main shaft (7), and the first torque motor is capable of driving the A-axis main shaft (7) to rotate so as to drive the cradle body (8) to perform a rotary motion along the A-axis; A second torque motor is connected to the outer side of the rotating shaft (27) of the rotary table (10), and the second torque motor can drive the rotating shaft (27) to rotate so as to drive the rotary table (10) to perform a rotary motion along the B axis.

2. The precision workbench according to claim 1, characterized in that: The rotary worktable (10) comprises a worktable surface (25) and a rotating shaft (27) located below the surface (25), wherein the rotating shaft (27) can drive the surface (25) located above it to rotate along axis B; a first bearing (9) is fixed at the connection between the surface (25) and the rotating shaft (27), and the rotating shaft (27) rotates in the first bearing (9).

3. The precision workbench according to claim 1, characterized in that: The rotating shaft (27) of the rotary table (10) is provided with a first step and a second step in sequence from the table top (25) downward along the central axis direction of the rotary table (10); the first bearing (9) is installed below the first step and is connected to the shell of the cradle body (8); a first clamping mechanism (12) is fixedly installed between the second step and the shell of the cradle body (8); the first clamping mechanism (12) is annular and sleeved to the rotating shaft (27); the bottom of the first clamping mechanism (12) is fixed to a first boss formed on the cradle body (8) at the bottom of the first clamping mechanism (12); and an air clamp brake block (19) is also provided on the inner side of the first clamping mechanism (12).

4. The precision workbench according to claim 3, characterized in that: A second torque motor is fixedly connected between the rotating shaft (27) below the first boss and the cradle body (8), wherein the top of the second torque motor rotor (15) is fixedly connected to the bottom of the rotor mounting seat (20), and the second torque motor stator (16) is fixed to the shell of the cradle body (8).

5. The precision workbench according to claim 1, characterized in that: The interior of the rotary table (10) is a hollow structure, the interior of the rotary table (10) includes an air pipeline, and an air path system (13) is installed inside the hollow structure of the rotary table (10), the air path system (13) includes an airtight system shaft whose top is clamped on the table bracket (11) and a sleeve (23) arranged between the air pipeline and the inner wall of the rotary table bracket (11), the bottom of the sleeve (23) is a circular ring structure, and the outermost side of the bottom of the circular ring-shaped sleeve (23) is connected to the shell of the cradle body (8) through a circular grating bracket (21).

6. The precision workbench according to claim 5, characterized in that: A first measuring system (14) is connected below the air pipeline via a transmission sleeve.

7. The precision workbench according to claim 1, characterized in that: A second boss is provided on the outer side of the A-axis main shaft (7); a third step is provided on the side of the second boss close to the cradle body (8); a second bearing (4) is fixed on the side of the second boss away from the cradle body (8); a first torque motor rotor (3) is provided on the side of the second shoulder away from the cradle body (8) and close to the edge of the second boss; and a first torque motor stator (2) is connected to the outer side of the first torque motor rotor (3).

8. The precision workbench according to claim 7, characterized in that: A turntable support seat (1) is installed at the bottom of the A-axis spindle (7), and the turntable support seat (1) includes an outer shell and an inner shell. The first torque motor is installed in a cavity formed by the outer shell and the inner shell, wherein the stator (2) of the first torque motor is fixedly connected to the inner wall of the outer shell.

9. The precision workbench according to claim 7, characterized in that: A second clamping mechanism (5) is provided between the inner wall of the outer shell and the third step, and an end face sealing block (6) is provided between the bottom of the outer shell and the A-axis main shaft (7).

10. The precision workbench according to claim 1, characterized in that: A second measuring system (17) is fixedly installed inside the inner housing, and the second measuring system (17) is connected to the A-axis spindle (7) via a pipeline bracket (24).

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