A double-drive single-swing head for vertical machining center

Abstract

The present invention discloses a dual-drive single swing head for a vertical machining center, including a swing head box, a spindle box, a spindle, an A-axis left drive assembly, an A-axis right drive assembly, an A-axis oil distributor assembly, an A-axis encoder assembly, and a spindle pipeline outlet unit. The A-axis left drive assembly includes a left torque motor assembly and a left hydraulic clamping mechanism, and the A-axis right drive assembly includes a right torque motor assembly and a right hydraulic clamping mechanism. The spindle pipeline outlet unit is spirally surrounded by a spindle pipeline, and a left protective cover and a right protective cover are respectively fixed on the left and right sides of the swing head box. The dual-drive single swing head of the present invention adopts a symmetrically designed dual-torque motor drive spindle box, which can provide a larger rotational torque, ensure the high dynamic characteristics and stability required for processing, and avoid the problem of shaft distortion and deformation in the traditional single-side drive method. At the same time, the use of a dual hydraulic clamping mechanism can provide a larger locking torque, which can ensure the braking effect and ensure the rigidity in the single swing head processing.

Description

Technical Field

[0001] The invention relates to a machining center accessory, in particular to a double-drive single-swing head for a vertical machining center. Background Art

[0002] The single swing head provides the machine tool with an additional degree of freedom of rotation axis, providing an excellent one-stop solution for multi-angle processing parts, and is an important component of high-end CNC machine tools. At present, the single swing head on the market is mainly driven by mechanical means, generally using a worm gear or rack and pinion drive. Although it has good economic efficiency, it is bulky in structure, the speed is generally not high, and the dynamic characteristics are poor. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a double-drive single-swing head for a vertical machining center which can ensure the high dynamic characteristics and stability required for machining, in view of the deficiencies of the prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a dual-drive single swing head for a vertical machining center, comprising a swing head box, a spindle box, a spindle, and an A-axis left drive component, an A-axis right drive component, an A-axis oil distributor component, an A-axis encoder component and a spindle pipeline outlet unit installed in the swing head box, the spindle box is upright installed in the middle of the swing head box, the spindle is upright installed in the spindle box, the lower end of the spindle extends from the spindle box, the A-axis left drive component and the A-axis right drive component are symmetrically arranged on the spindle box. On both sides of the box, the A-axis left drive assembly includes a left torque motor assembly and a left hydraulic clamping mechanism, the A-axis right drive assembly includes a right torque motor assembly and a right hydraulic clamping mechanism, the left torque motor assembly and the right torque motor assembly are used to provide driving force for the rotation of the spindle box, the left hydraulic clamping mechanism and the right hydraulic clamping mechanism are used to provide clamping torque for fixed-angle processing of the single swing head, the spindle pipeline outlet unit is spirally surrounded by a spindle pipeline, and the left and right sides of the swing head box are respectively fixed with a left protective cover and a right protective cover.

[0005] The dual-drive single swing head of the present invention adopts a symmetrically designed dual-torque motor to drive the spindle box, which can provide greater rotational torque, ensure the high dynamic characteristics and stability required for processing, and avoid the problem of shaft distortion and deformation in the traditional single-side drive method. At the same time, the use of a dual hydraulic clamping mechanism can provide a greater locking torque, which can ensure the braking effect and ensure the rigidity of the single swing head during processing.

[0006] Preferably, the left torque motor assembly and the right torque motor assembly have the same structure and are symmetrically arranged on both sides of the spindle box; the left torque motor assembly includes a motor stator, a motor rotor, a rotor connecting plate, a pressure cover, a cross-roller bearing, a rotating shaft, a flange and a bearing seat, the outer circle of the motor stator is centered with the swing head box and is fixedly connected by screws, the right end face of the motor stator is affixed to the bearing seat and is fixedly connected by screws, the outer circle of the bearing seat is centered with the swing head box, the right side of the bearing seat is fixed to the swing head box by screws, the cross-roller bearing is arranged in the bearing seat, the outer ring of the cross-roller bearing is centered with the bearing seat, and the right end face of the outer ring of the cross-roller bearing bears on the shaft On the bearing seat, the outer ring of the cross roller bearing is axially limited by the pressure cover, the pressure cover is fixed on the bearing seat by screws, the inner ring of the cross roller bearing is centered with the rotating shaft, the inner ring of the cross roller bearing is axially limited by the rotor connecting plate, the rotor connecting plate is fixedly connected with the motor rotor by screws, the inner hole of the rotor connecting plate is centered with the rotating shaft, the right side of the rotor connecting plate is fixedly connected with the rotating shaft by screws, the flange is sleeved on the right end of the rotating shaft, the inner hole of the flange is centered with the rotating shaft and is fixedly connected by screws, the flange is fixed to the left side of the spindle box by screws, and a stopper is integrally provided on the rotating shaft, and the stopper is centered with the countersunk hole on the spindle box. The above-mentioned motor stator and motor rotor work under power-on, driving the motor rotor to rotate around the A axis.

[0007] Furthermore, the left hydraulic clamping mechanism and the right hydraulic clamping mechanism have the same structure and are symmetrically arranged on both sides of the spindle box; the left hydraulic clamping mechanism includes a spring seat, a piston, a piston seal, a tie rod seal, an outer brake pad and an inner brake pad, the spring seat is arranged on the right side of the bearing seat, the outer circle of the spring seat is centeringly matched with the bearing seat, the left side of the spring seat is fixedly connected to the bearing seat by screws, the spring seat is located on the outside of the flange, a spring in a compressed state is installed in the spring seat, the spring is opposite to the right side of the outer brake pad, and the piston is annularly embedded in the In the bearing seat, the piston is located on the left side of the spring seat, the axial outer side of the outer brake pad is fixed on the bearing seat by screws and is arranged between the left end face of the bearing seat and the spring seat, the axial inner side of the outer brake pad is opposite to the piston, the left side of the piston and the bearing seat form an oil chamber, and the oil chamber is connected to the external oil supply system, the axial outer side of the inner brake pad is fixed on the rotating shaft by screws, the axial inner side of the inner brake pad is opposite to the axial inner side of the outer brake pad, the piston sleeve is arranged on the outer ring of the piston, and the pull rod seal is lined on the inner ring of the piston. The above-mentioned left hydraulic clamping mechanism and the left and right hydraulic clamping mechanisms are used as brake mechanisms to ensure the fixed angle processing accuracy and realize power-off protection. When the spindle box rotates forward and reversely around the A axis, the outer brake pad does not rotate relative to the A axis, and the inner brake pad can rotate around the A axis. When braking, the hydraulic oil enters the swing head box through the pipeline and finally enters the oil chamber, acts on the left end face of the piston, and pushes the piston to move to the right. During the movement, the piston squeezes the outer brake pad, forcing it to bend elastically and squeeze the inner brake pad, until the inner brake pad is finally fitted with the spring seat. At this time, the friction force acts on the left and right end faces of the inner brake pad, so that the spindle box cannot continue to rotate around the A axis, thus achieving braking. The double friction surface structure of the left and right end faces of the inner brake pad has sufficient clamping force. When the brake needs to be canceled, the hydraulic oil in the oil chamber flows back, and the spring automatically resets, pushing the outer brake pad to reset. The above-mentioned spring automatic reset method is convenient for simplifying the internal structure of the swing head while ensuring reliability. The piston seal and the tie rod seal work together to ensure smooth piston movement without oil leakage.

[0008] Furthermore, an oil leakage structure is provided between the bearing seat and the swing head housing, and the oil leakage structure includes a first oil circuit and a second oil circuit that are in communication, the first oil circuit is provided on the side wall of the bearing seat, the second oil circuit is provided on the side wall of the swing head housing, the first oil circuit is in communication with the gap between the bearing seat and the outer brake pad, and the second oil circuit is in communication with the outside. Due to long-term operation, the piston seal and the tie rod seal on the piston will be worn, causing oil leakage, and eventually the leaked lubricating oil accumulates between the bearing seat and the outer brake pad. After designing the above-mentioned oil leakage structure, the lubricating oil accumulated between the bearing seat and the outer brake pad is finally discharged from the swing head housing through the first oil circuit and the second oil circuit, thereby ensuring the braking effect and reliability of the hydraulic clamping mechanism.

[0009] Preferably, the single swing head further comprises an A-axis hard limit joint, wherein the A-axis hard limit structure comprises a rotor connection plate limit block, an anti-collision block and two buffer blocks, wherein the rotor connection plate is fixed to the left side of the rotor connection plate by screws, a valve plate is fixed to the left side of the swing head housing, the anti-collision block and the two buffer blocks are respectively fixed to the valve plate by screws, the two buffer blocks are respectively arranged on both sides of the anti-collision block, and the rotation angle of the spindle box is limited between the two buffer blocks. Driven by the left torque motor assembly and the right torque motor assembly, the spindle box can rotate forward and reversely around the A-axis, and the anti-collision block is stationary relative to the A-axis. When the spindle box rotates clockwise, the limit block moves clockwise at the same time until one end face of the limit block contacts a buffer block, and the clockwise rotation limit is completed; when the spindle box rotates counterclockwise, the limit block moves counterclockwise at the same time until the other end face of the limit block contacts another buffer block, and the counterclockwise rotation limit is completed. The main function of the A-axis hard limit structure is to prevent the rotation angle of the swing head spindle from exceeding the design range, thereby avoiding damage to spindle parts or breakage of wires and pipes. Traditional swing head spindles usually use electrical soft limiters, but the disadvantage is that when the power is off or the soft limit fails, the swing axis angle of the swing head exceeds the permitted range, causing damage to spindle parts or breakage of wires and pipes. Compared with the traditional electrical soft limit structure, the A-axis hard limit structure adopted by the present invention is simple, safe and reliable.

[0010] Furthermore, the A-axis encoder assembly includes an A-axis encoder and an encoder seat, the A-axis encoder is installed in the encoder seat, the encoder seat is fixed to the right side of the valve plate, the A-axis oil separator assembly includes an inner oil separator and an outer oil separator, the left side of the inner oil separator is fixed to the encoder seat by screws, the rotating shaft is sleeved on the outer side of the inner oil separator, the outer circle of the inner oil separator is matched with the rotating shaft with a small gap, a plurality of first rotating sealing rings are arranged at equal intervals on the outer circumference of the inner oil separator, and two adjacent first rotating sealing rings and the outer circle of the inner oil separator form a first cavity , several of the first cavities transmit the functional oil circuit from the inner oil separator to the rotating shaft; the outer circle of the outer oil separator is centered with the encoder seat, the left side of the outer oil separator is fixed to the encoder seat by screws, the outer oil separator is sleeved on the outer side of the rotating shaft, the inner hole of the outer oil separator is matched with the small clearance of the rotating shaft, several second rotating sealing rings are arranged at equal intervals on the inner circumference of the outer oil separator, two adjacent second rotating sealing rings and the inner circle of the outer oil separator form a second cavity, and several of the second cavities transmit the functional oil circuit from the outer oil separator to the rotating shaft. The A-axis oil separator assembly adopts the structural design of the inner oil separator and the outer oil separator, which is conducive to saving the limited axial space inside the swing head, reducing the overall size of the single swing head, improving the versatility of the single swing head in parts processing, and increasing the market competitiveness of the machine tool. The function of the A-axis oil distributor assembly is to conduct the functional oil circuit of the medium (oil, gas, water) with a certain pressure into the spindle box and the rotating shaft to realize the functions of loosening the clamping tool, gas sealing, motor cooling, ring spraying, etc. The main function of the A-axis encoder assembly is to measure the angle change of the rotating shaft of the single swing head to ensure the accuracy of the processing angle.

[0011] Preferably, the spindle pipeline is a collection of several cables, oil pipes and air pipes, the spindle pipeline outlet unit is arranged on the right side of the swing head box, the spindle pipeline outlet unit includes an outlet shaft and a hoop drum, the hoop drum is arranged in a stepped manner on the inner side of the motor stator of the right torque motor assembly and is fixed to the motor stator by screws, the left end of the outlet shaft is fixed to the right side of the rotating shaft of the right torque motor assembly by screws and crosses the hoop drum, a round tube is fixed to the right end of the outlet shaft, a first outlet is opened on the outlet shaft, which is communicated with the inner hole of the rotating shaft of the right torque motor assembly, a second outlet is opened on the right protective cover, and a third outlet is opened on the top of the swing head box, after the spindle pipeline passes through the inner hole of the rotating shaft of the right torque motor assembly and the first outlet, it spirally surrounds the outlet shaft and the round tube, enters the internal cavity of the swing head box through the second outlet, and finally enters the inside of the machine tool through the third outlet to achieve docking. The function of the spindle pipeline is to provide the required power supply, data monitoring, hydraulic, pneumatic, lubrication and other functions for the swing head spindle. Traditional ordinary swing head outlets are generally external or use ultra-flexible cables. The former will reduce the passability of the swing head during parts processing and easily damage the pipeline; the latter is expensive and difficult to purchase. The swing head adopts a spiral winding method to convert the rotational movement of the spindle pipeline in space into the axial telescopic movement of the spiral line, which not only ensures the sealing and safety of the spindle pipeline, but also reduces the cost. The design of the spindle pipeline outlet unit of the present invention effectively utilizes the flexibility of the spindle pipeline, ensuring that when the spindle pipeline rotates forward and reversely with the spindle box within a limited stroke range, the spirally wrapped spindle pipeline only changes the size of the pitch, and the main body of the spindle pipeline does not twist, thereby ensuring the safety and service life of the spindle pipeline. The hoop drum can limit and ensure the outer diameter of the spindle pipeline. The hoop drum can be welded from multiple thin plates. When the spindle box rotates forward and reversely around the A-axis, the swing head box, the motor stator and the hoop reel are stationary relative to the A-axis, and the spindle pipeline, flange, rotating shaft, outlet shaft and round tube rotate relative to the A-axis.

[0012] Compared with the prior art, the present invention has the following advantages: the dual-drive single swing head of the present invention adopts a symmetrically designed dual-torque motor to drive the spindle box, which can provide greater rotational torque, ensure the high dynamic characteristics and stability required for processing, and avoid the problem of shaft distortion and deformation in the traditional single-side drive method. At the same time, the use of a dual hydraulic clamping mechanism can provide a greater locking torque, which can ensure the braking effect and ensure the rigidity of the single swing head during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural exploded view of the dual-drive single swing head in the embodiment;

[0014] Figure 2The left half of the dual-drive single swing head in the embodiment is shown in a partial cross-section. Figure 1 ;

[0015] Figure 3 The left half of the dual-drive single swing head in the embodiment is shown in a partial cross-section. Figure 2 ;

[0016] Figure 4 The left half of the dual-drive single swing head in the embodiment is shown in a partial cross-section. Figure 3 ;

[0017] Figure 5 It is a cross-sectional view of the right half of the dual-drive single swing head in the embodiment;

[0018] Figure 6 This is a structural exploded view of the A-axis oil separator assembly in the embodiment;

[0019] Figure 7 This is a schematic diagram of the assembly of the A-axis hard limit structure in the embodiment;

[0020] Figure 8 It is a right view of the dual-drive single-oscillating head in the embodiment after removing the right protective cover. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings.

[0022] The double-drive single swing head for vertical machining center of Example 1, as shown in the figure, includes a swing head box 1, a spindle box 2, a spindle 21, and an A-axis left drive assembly 31, an A-axis right drive assembly 32, an A-axis oil distributor assembly 5, an A-axis encoder assembly 6, an A-axis hard limit joint and a spindle pipeline outlet unit installed in the swing head box 1. The spindle box 2 is upright installed in the middle of the swing head box 1, and the spindle 21 is upright installed on the spindle box 2. The lower end of the spindle 21 extends out from the spindle box 2. The A-axis left drive assembly 31 and the A-axis right drive assembly 32 are arranged symmetrically on the left and right. On both sides of the spindle box 2, the A-axis left drive assembly 31 includes a left torque motor assembly and a left hydraulic clamping mechanism, and the A-axis right drive assembly 32 includes a right torque motor assembly and a right hydraulic clamping mechanism. The left torque motor assembly and the right torque motor assembly are used to provide driving force for the rotation of the spindle box 2, and the left hydraulic clamping mechanism and the right hydraulic clamping mechanism are used to provide clamping torque for the single swing head fixed angle processing. The spindle pipeline 7 is spirally wrapped around the spindle pipeline outlet unit, and the left protective cover 11 and the right protective cover 12 are respectively fixed to the left and right sides of the swing head box 1.

[0023] In Example 1, the left torque motor assembly and the right torque motor assembly have the same structure and are symmetrically arranged on both sides of the spindle box 2; the left torque motor assembly includes a motor stator 33, a motor rotor 34, a rotor connecting plate 35, a pressure cover 36, a cross roller bearing 37, a rotating shaft 38, a flange 39 and a bearing seat 30, the outer circle of the motor stator 33 is centered with the swing head box 1 and is fixedly connected by screws, the right end face of the motor stator 33 is affixed to the bearing seat 30 and is fixedly connected by screws, the outer circle of the bearing seat 30 is centered with the swing head box 1, the right side of the bearing seat 30 is fixed to the swing head box 1 by screws, the cross roller bearing 37 is arranged in the bearing seat 30, the outer ring of the cross roller bearing 37 is centered with the bearing seat 30, and the right end of the outer ring of the cross roller bearing 37 The surface is supported on the bearing seat 30, and the outer ring of the cross roller bearing 37 is axially limited by the pressure cover 36. The pressure cover 36 is fixed to the bearing seat 30 by screws. The inner ring of the cross roller bearing 37 is centered with the rotating shaft 38. The inner ring of the cross roller bearing 37 is axially limited by the rotor connecting plate 35. The rotor connecting plate 35 is fixedly connected to the motor rotor 34 by screws. The inner hole of the rotor connecting plate 35 is centered with the rotating shaft 38. The right side of the rotor connecting plate 35 is fixedly connected to the rotating shaft 38 by screws. The flange 39 is sleeved on the right end of the rotating shaft 38. The inner hole of the flange 39 is centered with the rotating shaft 38 and fixedly connected by screws. The flange 39 is fixed to the left side of the spindle box 2 by screws. A stopper is integrally provided on the rotating shaft 38, and the stopper is centered with the countersunk hole 22 on the spindle box 2.

[0024] In Example 1, the left hydraulic clamping mechanism and the right hydraulic clamping mechanism have the same structure and are symmetrically arranged on both sides of the spindle box 2; the left hydraulic clamping mechanism includes a spring seat 41, a piston 42, a piston seal 43, a tie rod seal 44, an outer brake pad 45 and an inner brake pad 46, the spring seat 41 is arranged on the right side of the bearing seat 30, the outer circle of the spring seat 41 is centered with the bearing seat 30, the left side of the spring seat 41 is fixedly connected to the bearing seat 30 by screws, the spring seat 41 is located on the outside of the flange 39, a spring in a compressed state (not shown in the figure) is installed in the spring seat 41, the spring is directly on the right side of the outer brake pad 45, and the piston 42 is annular Embedded in the bearing seat 30, the piston 42 is located on the left side of the spring seat 41, the axial outer side of the outer brake pad 45 is fixed to the bearing seat 30 by screws and is arranged between the left end surface of the bearing seat 30 and the spring seat 41, the axial inner side of the outer brake pad 45 is opposite to the piston 42, the left side of the piston 42 and the bearing seat 30 form an oil chamber 47, the oil chamber 47 is communicated with the external oil supply system, the axial outer side of the inner brake pad 46 is fixed to the rotating shaft 38 by screws, the axial inner side of the inner brake pad 46 is opposite to the axial inner side of the outer brake pad 45, the piston seal 43 is sleeved on the outer ring of the piston 42, and the tie rod seal 44 is lined with the inner ring of the piston 42.

[0025] In Example 1, the hard limit structure of the A-axis includes a rotor connecting plate limit block 48, an anti-collision block 49 and two buffer blocks 40. The rotor connecting plate 35 is fixed to the left side of the rotor connecting plate 35 by screws. The valve plate 13 is fixed to the left side of the swing head box 1. The anti-collision block 49 and the two buffer blocks 40 are respectively fixed to the valve plate 13 by screws. The two buffer blocks 40 are respectively arranged on both sides of the anti-collision block 49, and the rotation angle of the spindle box 2 is limited between the two buffer blocks 40.

[0026] In Embodiment 1, the A-axis encoder assembly 6 includes an A-axis encoder (not shown in the figure) and an encoder seat 61. The A-axis encoder is installed in the encoder seat 61. The encoder seat 61 is fixed to the right side of the valve plate 13. The A-axis oil separator assembly 5 includes an inner oil separator 51 and an outer oil separator 52. The left side of the inner oil separator 51 is fixed to the encoder seat 61 by screws. The rotating shaft 38 is sleeved on the outer side of the inner oil separator 51. The outer circle of the inner oil separator 51 is matched with the rotating shaft 38 with a small gap. A plurality of first rotating sealing rings 53 are arranged at equal intervals on the outer circumference of the inner oil separator 51. The outer circumference of the two adjacent first rotating sealing rings and the inner oil separator 51 is surrounded by a plurality of first rotating sealing rings 53. A first cavity is formed, and several first cavities transmit the functional oil circuit from the inner oil separator 51 to the rotating shaft 38; the outer circle of the outer oil separator 52 is centered with the encoder seat 61, and the left side of the outer oil separator 52 is fixed to the encoder seat 61 by screws. The outer oil separator 52 is sleeved on the outside of the rotating shaft 38, and the inner hole of the outer oil separator 52 is matched with the rotating shaft 38 with a small gap. Several second rotating sealing rings 54 are arranged at equal intervals on the inner circumference of the outer oil separator 52. Two adjacent second rotating sealing rings 54 and the inner circle of the outer oil separator 52 form a second cavity, and several second cavities transmit the functional oil circuit from the outer oil separator 52 to the rotating shaft 38.

[0027] In Example 1, the spindle pipeline 7 is a collection of several cables, oil pipes and air pipes. The spindle pipeline outlet unit is arranged on the right side of the swing head box 1. The spindle pipeline outlet unit includes an outlet shaft 71 and a hoop drum 72. The hoop drum 72 is arranged in a stepped manner on the inner side of the motor stator 33' of the right torque motor assembly and is fixed to the motor stator 33' by screws. The left end of the outlet shaft 71 is fixed to the right side of the rotating shaft 38' of the right torque motor assembly by screws and crosses the hoop drum 72. The right end of the outlet shaft 71 is fixed with The round tube 73 and the wire outlet shaft 71 are provided with a first outlet 74 which is communicated with the inner hole of the rotating shaft 38' of the right torque motor assembly, the right protective cover 12 is provided with a second outlet 14, and the top of the swing head box 1 is provided with a third outlet 15. After the spindle pipeline 7 passes through the inner hole of the rotating shaft 38' of the right torque motor assembly and the first outlet 74, it spirally wraps around the wire outlet shaft 71 and the round tube 73, enters the internal cavity of the swing head box 1 through the second outlet 14, and finally enters the interior of the machine tool through the third outlet 15 to achieve docking.

[0028] The dual-drive single swing head for the vertical machining center of Example 2 differs from Example 1 in that, in Example 2, an oil leakage structure is arranged between the bearing seat 30 and the swing head housing 1, and the oil leakage structure includes a first oil circuit 81 and a second oil circuit 82 that are connected to each other. The first oil circuit 81 is opened on the side wall of the bearing seat 30, and the second oil circuit 82 is opened on the side wall of the swing head housing 1. The first oil circuit 81 is connected to the gap between the bearing seat 30 and the outer brake pad 45, and the second oil circuit 82 is connected to the outside.

Claims

1. A double-drive single-swing head for a vertical machining center, characterized in that: It includes a swing head box, a spindle box, a spindle, and an A-axis left drive assembly, an A-axis right drive assembly, an A-axis oil distributor assembly, an A-axis encoder assembly and a spindle pipeline outlet unit installed in the swing head box, the spindle box is upright installed in the middle of the swing head box, the spindle is upright installed on the spindle box, the lower end of the spindle extends from the spindle box, the A-axis left drive assembly and the A-axis right drive assembly are symmetrically arranged on both sides of the spindle box, the A-axis left drive assembly includes a left torque motor assembly and a left hydraulic clamping mechanism, the A-axis right drive assembly includes a right torque motor assembly and a right hydraulic clamping mechanism, the left torque motor assembly and the right torque motor assembly are used to provide driving force for the rotation of the spindle box, the left hydraulic clamping mechanism and the right hydraulic clamping mechanism are used to provide clamping torque for single swing head fixed angle processing, the spindle pipeline outlet unit is spirally surrounded by a spindle pipeline, and a left protective cover and a right protective cover are respectively fixed on the left and right sides of the swing head box; The left torque motor assembly and the right torque motor assembly have the same structure and are symmetrically arranged on both sides of the spindle box; the left torque motor assembly includes a motor stator, a motor rotor, a rotor connecting plate, a pressure cover, a cross-roller bearing, a rotating shaft, a flange and a bearing seat, the outer circle of the motor stator is centered with the swing head box and fixedly connected by screws, the right end face of the motor stator is affixed to the bearing seat and fixedly connected by screws, the outer circle of the bearing seat is centered with the swing head box, the right side of the bearing seat is fixed to the swing head box by screws, the cross-roller bearing is arranged in the bearing seat, the outer ring of the cross-roller bearing is centered with the bearing seat, and the right end face of the outer ring of the cross-roller bearing rests on the bearing seat , the outer ring of the cross roller bearing is axially limited by the pressure cover, the pressure cover is fixed to the bearing seat by screws, the inner ring of the cross roller bearing is matched with the rotating shaft, the inner ring of the cross roller bearing is axially limited by the rotor connecting plate, the rotor connecting plate is fixedly connected to the motor rotor by screws, the inner hole of the rotor connecting plate is matched with the rotating shaft, the right side of the rotor connecting plate is fixedly connected to the rotating shaft by screws, the flange is sleeved on the right end of the rotating shaft, the inner hole of the flange is matched with the rotating shaft and fixedly connected by screws, the flange is fixed to the left side of the main shaft box by screws, and a stopper is integrally provided on the rotating shaft, and the stopper is matched with the countersunk hole on the main shaft box for centering; The left hydraulic clamping mechanism and the right hydraulic clamping mechanism have the same structure and are symmetrically arranged on both sides of the spindle box; the left hydraulic clamping mechanism includes a spring seat, a piston, a piston seal, a tie rod seal, an outer brake pad and an inner brake pad, the spring seat is arranged on the right side of the bearing seat, the outer circle of the spring seat is centeringly matched with the bearing seat, the left side of the spring seat is fixedly connected to the bearing seat by screws, the spring seat is located on the outside of the flange, a spring in a compressed state is installed in the spring seat, the spring is opposite to the right side of the outer brake pad, and the piston is annularly embedded in the bearing seat The piston is located on the left side of the spring seat, the axial outer side of the outer brake pad is fixed to the bearing seat by screws and is arranged between the bearing seat and the left end surface of the spring seat, the axial inner side of the outer brake pad is opposite to the piston, the left side of the piston and the bearing seat form an oil chamber, the oil chamber is communicated with the external oil supply system, the axial outer side of the inner brake pad is fixed to the rotating shaft by screws, the axial inner side of the inner brake pad is opposite to the axial inner side of the outer brake pad, the piston sleeve is arranged on the outer ring of the piston, and the pull rod seal is lined with the inner ring of the piston.

2. The double-drive single-swing head for a vertical machining center according to claim 1, characterized in that: An oil leakage structure is arranged between the bearing seat and the swing head box body, and the oil leakage structure includes a first oil circuit and a second oil circuit which are in communication with each other. The first oil circuit is opened on the side wall of the bearing seat, and the second oil circuit is opened on the side wall of the swing head box body. The first oil circuit is in communication with the gap between the bearing seat and the outer brake pad, and the second oil circuit is in communication with the outside world.

3. The double-drive single-swing head for a vertical machining center according to claim 1, characterized in that: It also includes an A-axis hard limit joint, and the A-axis hard limit structure includes a rotor connecting plate limit block, an anti-collision block and two buffer blocks. The rotor connecting plate is fixed to the left side of the rotor connecting plate by screws, and a valve plate is fixed to the left side of the swing head box body. The anti-collision block and the two buffer blocks are respectively fixed to the valve plate by screws, and the two buffer blocks are respectively arranged on both sides of the anti-collision block. The rotation angle limit of the spindle box is located between the two buffer blocks.

4. The double-drive single-swing head for a vertical machining center according to claim 3, characterized in that: The A-axis encoder assembly includes an A-axis encoder and an encoder seat, wherein the A-axis encoder is installed in the encoder seat, and the encoder seat is fixed on the right side of the valve plate. The A-axis oil separator assembly includes an inner oil separator and an outer oil separator, wherein the left side of the inner oil separator is fixed to the encoder seat by screws, and the rotating shaft sleeve is arranged on the outer side of the inner oil separator, and the outer circle of the inner oil separator is matched with the rotating shaft with a small gap. A plurality of first rotating sealing rings are arranged at equal intervals on the outer circumference of the inner oil separator, and two adjacent first rotating sealing rings and the outer circle of the inner oil separator form a first cavity. If The first cavity described in the dry conducts the functional oil circuit from the inner oil separator to the rotating shaft; the outer circle of the outer oil separator is centered with the encoder seat, the left side of the outer oil separator is fixed to the encoder seat by screws, the outer oil separator is sleeved on the outside of the rotating shaft, the inner hole of the outer oil separator is matched with a small gap of the rotating shaft, and a plurality of second rotating sealing rings are arranged at equal intervals on the inner circumference of the outer oil separator, two adjacent second rotating sealing rings and the inner circle of the outer oil separator form a second cavity, and the plurality of second cavities conduct the functional oil circuit from the outer oil separator to the rotating shaft.

5. The double-drive single-swing head for a vertical machining center according to claim 1, characterized in that: The spindle pipeline is a collection of several cables, oil pipes and air pipes. The spindle pipeline outlet unit is arranged on the right side of the swing head box. The spindle pipeline outlet unit includes an outlet shaft and a hoop drum. The hoop drum is arranged in a stepped manner on the inner side of the motor stator of the right torque motor assembly and is fixed to the motor stator by screws. The left end of the outlet shaft is fixed to the right side of the rotating shaft of the right torque motor assembly by screws and crosses the hoop drum. A round tube is fixed to the right end of the outlet shaft. A first outlet communicating with the inner hole of the rotating shaft of the right torque motor assembly is opened on the outlet shaft, a second outlet is opened on the right protective cover, and a third outlet is opened on the top of the swing head box. After the spindle pipeline passes through the inner hole of the rotating shaft of the right torque motor assembly and the first outlet, it spirally surrounds the outlet shaft and the round tube, enters the internal cavity of the swing head box through the second outlet, and finally enters the inside of the machine tool through the third outlet to achieve docking.

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