阅读说明：本技术 坦克座圈定位销孔用钻机及加工坦克座圈定位销孔的方法 (Drilling machine for tank seat ring positioning pin hole and method for machining tank seat ring positioning pin hole ) 是由 刘喜平 杨育林 黄世军 于 2019-10-29 设计创作，主要内容包括：本发明提供一种坦克座圈定位销孔用钻机,其包括转向装置、升降装置、伸缩装置、钻孔装置、扇形连接板和电控系统,转向装置包括大梁、第一伺服电机和摆动轴,大梁上固连有电控系统和扇形连接板,摆动轴与升降装置中的摆臂固连；升降装置还包括第三伺服电机、第二减速器、第二丝杠和第二螺母,第二螺母与伸缩装置中的滑座固连；伸缩装置还包括第四伺服电机、第三减速器、第一丝杠和第一螺母,第一螺母与钻孔装置中的主轴箱固连；钻孔装置包括主轴箱、第二伺服电机、第一减速器和钻削主轴。该发明包括四个自由度,能实现坦克座圈定位销孔的自动加工,提高了定位销孔的加工质量,减轻了工人的劳动强度,并能保证产品质量的一致性。(The invention provides a drilling machine for a positioning pin hole of a tank seat ring, which comprises a steering device, a lifting device, a telescopic device, a drilling device, a fan-shaped connecting plate and an electric control system, wherein the steering device comprises a girder, a first servo motor and a swinging shaft; the lifting device also comprises a third servo motor, a second speed reducer, a second lead screw and a second nut, and the second nut is fixedly connected with a sliding seat in the telescopic device; the telescopic device also comprises a fourth servo motor, a third speed reducer, a first lead screw and a first nut, wherein the first nut is fixedly connected with a spindle box in the drilling device; the drilling device comprises a spindle box, a second servo motor, a first speed reducer and a drilling spindle. The tank seat ring positioning pin hole machining device comprises four degrees of freedom, can realize automatic machining of the tank seat ring positioning pin hole, improves machining quality of the positioning pin hole, reduces labor intensity of workers, and can guarantee consistency of product quality.)

1. The utility model provides a tank seat circle rig for locating pin hole, its is including turning to device, elevating gear, telescoping device, drilling equipment, fan-shaped connecting plate and electrical system, its characterized in that:

the steering device comprises a girder, a first servo motor and a swing shaft, the girder is fixedly connected with the electric control system, the fan-shaped connecting plates are fixedly connected at two ends of the girder respectively, the swing shaft is supported by a rolling bearing in the girder, the first servo motor is fixedly connected with a first end of the swing shaft, and a second end of the swing shaft is fixedly connected with a swing arm in the lifting device;

the lifting device comprises a third servo motor, a second speed reducer, a first speed reducer connecting plate, a second lead screw, a second nut, a third rolling guide rail sliding seat, a fourth rolling guide rail and a fourth rolling guide rail sliding seat, the end surface of the swing arm is fixedly connected with the first speed reducer connecting plate, the third servo motor is connected with the second speed reducer fixedly connected with the first speed reducer connecting plate, the second speed reducer is connected with the second lead screw, the second lead screw is meshed with the second nut to form a thread pair, and the second nut is fixedly connected with the sliding seat in the telescopic device so as to realize the lifting of the telescopic device;

the third rolling guide rail and the fourth rolling guide rail are arranged on the swing arm, a third rolling guide rail sliding seat and a fourth rolling guide rail sliding seat respectively form a sliding pair with the third rolling guide rail and the fourth rolling guide rail, and the third rolling guide rail sliding seat and the fourth rolling guide rail sliding seat are respectively and fixedly connected with the sliding seats so as to play a role in guiding the movement of the telescopic device;

the telescopic device comprises a fourth servo motor, a third speed reducer, a second speed reducer connecting plate, a first lead screw, a first nut, a first rolling guide rail sliding seat, a first rolling guide rail, a second rolling guide rail and a second rolling guide rail sliding seat, wherein the end surface of the sliding seat is fixedly connected with the second speed reducer connecting plate, the fourth servo motor is connected with the third speed reducer fixedly connected with the second speed reducer connecting plate, the third speed reducer is connected with the first lead screw, the first lead screw is meshed with the first nut to form a thread pair, and the first nut is fixedly connected with a spindle box in the drilling device so as to realize the telescopic of the drilling device;

the first rolling guide rail and the second rolling guide rail are arranged on the sliding base, the first rolling guide rail sliding base and the second rolling guide rail sliding base respectively form a sliding pair with the first rolling guide rail and the second rolling guide rail, and the first rolling guide rail sliding base and the second rolling guide rail sliding base are respectively fixedly connected with the spindle box so as to play a role in guiding the movement of the drilling device;

the drilling device further comprises a second servo motor, a first speed reducer and a drilling main shaft, the second servo motor is connected with the first speed reducer, the first speed reducer is connected with the drilling main shaft, the drilling main shaft is supported through a rolling bearing in the main shaft box, a central conical blind hole is formed in the end face of the drilling main shaft, a rectangular blind hole matched with the central conical blind hole is formed in the bottom of the central conical blind hole, and the rectangular blind hole is matched with the flat tail of the drill bit to transmit torque.

2. The drilling machine for the positioning pin hole of the tank seat ring according to claim 1, wherein: the outer contour of the fan-shaped connecting plate and the spigot of the mounting seat ring of the gun tower of the tank form clearance fit, two penetrating cylindrical holes are formed in the fan-shaped connecting plate, and the crossbeam is fixed on the mounting surface of the mounting seat ring of the gun tower of the tank through bolts;

the beam is a diamond square tube, a vertical cylindrical hole is formed in the beam, the axis of the hole is coincident with the vertical central line of the beam, and a rolling bearing is installed in the vertical hole of the beam.

3. The drilling machine for the positioning pin hole of the tank seat ring according to claim 1, wherein: the swing arm is a rectangular square tube, the third rolling guide rail and the fourth rolling guide rail are both parallel to the central line of the swing arm, and the axis of the second lead screw is positioned in the symmetrical plane of the third rolling guide rail and the fourth rolling guide rail;

the first rolling guide rail and the second rolling guide rail are parallel to each other and are both vertical to the third rolling guide rail, and the axis of the first lead screw is positioned in the symmetrical plane of the first rolling guide rail and the second rolling guide rail;

the axis of the drilling spindle is parallel to the first rolling guide rail and the second rolling guide rail, the spindle box is provided with a vertical cylindrical hole, rolling bearings are arranged at two ends of the cylindrical hole, and a shell of the first speed reducer is fixed on the end face of the spindle box.

4. The drilling machine for the positioning pin hole of the tank seat ring according to claim 2, wherein: the first servo motor, the second servo motor, the third servo motor and the fourth servo motor are all electrically connected with the electric control system, each servo motor is internally provided with a coder and is provided with a band-type brake, and the fourth servo motor is provided with a drilling feeding speed mode and a fast-forwarding and fast-rewinding mode.

5. A drilling machine for a positioning pin hole of a tank seat ring according to claim 3, characterized in that: the coordinate system origin setting process is as follows: and adjusting the central line of the swing arm to be perpendicular to the central line of the crossbeam, so that the slide base moves to the limit position closest to the central line of the crossbeam, the spindle box is positioned at the upper limit position, the intersection point position of the axis of the drilling spindle and the lower end surface of the drilling spindle is set as the origin of coordinates, and the indication values of the built-in encoders of the first servo motor, the third servo motor and the fourth servo motor are set as 0.

6. A method of machining a tank seat ring dowel hole with a drill using the tank seat ring dowel hole of any one of claims 1-5, characterized by: which comprises the following steps:

s1, hoisting the positioning pin holes of the tank seat ring to the mounting surface of the gun tower mounting seat ring of the tank by using a drilling machine through a crown block, adjusting the position to enable the through cylindrical holes in the fan-shaped connecting plate to be coaxial with the corresponding cylindrical holes in the gun tower mounting seat ring, and fixing the positioning pin holes of the tank seat ring and the gun tower mounting seat ring of the tank together by using the drilling machine;

s2, mounting the drill on the drilling main shaft, and starting the electric control system to enable the intersection point of the axis of the drilling main shaft and the lower end surface to be located at the origin position of a coordinate system;

s3, starting the first servo motor, driving the swing arm to rotate to a set angle through the swing shaft, and braking and locking the first servo motor;

s4, starting the third servo motor, driving the sliding seat to move to a set position through the second speed reducer, the second lead screw and the second nut, and braking and locking the third servo motor;

s5, starting the fourth servo motor according to fast forward and fast backward, driving the spindle box to move to a set position through the third speed reducer, the first lead screw and the first nut, and changing the fourth servo motor into a drilling feed speed mode;

and S6, simultaneously, starting the second servo motor, driving the drill bit to rotate through the first speed reducer and the drilling spindle, starting the fourth servo motor according to a fast forward and fast backward mode after the processed hole reaches the processing depth, enabling the spindle box to return to the original position fast, braking the fourth servo motor and the second servo motor, and finishing processing the positioning pin hole.

Technical Field

The invention belongs to the technical field of machinery, and particularly relates to a drilling machine for machining a positioning pin hole of a tank seat ring and a method for machining the positioning pin hole of the tank seat ring.

Background

The seat ring of the tank is positioned at the lower part of the turret and is about 900mm away from the turret installation seat ring, and two positioning pin holes are arranged on the seat ring and must be processed together with related connecting pieces on the installation site. When the seat ring is installed, various covering parts are installed around the seat ring, so that the machining difficulty of the seat ring positioning pin hole is high.

The prior method for processing the seat ring positioning pin hole mainly adopts a method of adding an extension rod drill bit by an electric hand drill, and has the defects that: 1) the processing precision is low; 2) the working condition is poor; 3) the operator's experience has a large impact on the results.

Disclosure of Invention

The invention provides a drilling machine for machining a positioning pin hole of a tank seat ring, which can realize automatic machining of the positioning pin hole of the seat ring. Meanwhile, the invention also provides a method for machining the positioning pin hole of the tank seat ring.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a drilling machine for machining a positioning pin hole of a tank seat ring comprises a steering device, a lifting device, a telescopic device, a drilling device, a fan-shaped connecting plate and an electric control system, wherein the steering device comprises a girder, a first servo motor and a swing shaft, the girder is fixedly connected with the electric control system, the fan-shaped connecting plate is fixedly connected to two ends of the girder respectively, the swing shaft is supported through a rolling bearing in the girder, the first servo motor is fixedly connected with a first end of the swing shaft, and a second end of the swing shaft is fixedly connected with a swing arm in the lifting device; the lifting device further comprises a third servo motor, a second speed reducer, a first speed reducer connecting plate, a second lead screw, a second nut, a third rolling guide rail sliding seat, a fourth rolling guide rail and a fourth rolling guide rail sliding seat, the end face of the swing arm is fixedly connected with the first speed reducer connecting plate, the third servo motor is connected with the second speed reducer fixedly connected onto the first speed reducer connecting plate, the second speed reducer is connected with the second lead screw, the second lead screw is meshed with the second nut to form a thread pair, and the second nut is fixedly connected with the sliding seat in the telescopic device so as to realize the lifting of the telescopic device; the third rolling guide rail and the fourth rolling guide rail are arranged on the swing arm, a third rolling guide rail sliding seat and a fourth rolling guide rail sliding seat respectively form a sliding pair with the third rolling guide rail and the fourth rolling guide rail, and the third rolling guide rail sliding seat and the fourth rolling guide rail sliding seat are respectively and fixedly connected with the sliding seats so as to play a role in guiding the movement of the telescopic device; the telescopic device further comprises a fourth servo motor, a third speed reducer, a second speed reducer connecting plate, a first lead screw, a first nut, a first rolling guide rail sliding seat, a first rolling guide rail, a second rolling guide rail and a second rolling guide rail sliding seat, wherein the end surface of the sliding seat is fixedly connected with the second speed reducer connecting plate, the fourth servo motor is connected with the third speed reducer fixedly connected onto the second speed reducer connecting plate, the third speed reducer is connected with the first lead screw, the first lead screw is meshed with the first nut to form a thread pair, and the first nut is fixedly connected with a main spindle box in the drilling device so as to realize the telescopic of the drilling device; the first rolling guide rail and the second rolling guide rail are arranged on the sliding base, the first rolling guide rail sliding base and the second rolling guide rail sliding base respectively form a sliding pair with the first rolling guide rail and the second rolling guide rail, and the first rolling guide rail sliding base and the second rolling guide rail sliding base are respectively fixedly connected with the spindle box so as to play a role in guiding the movement of the drilling device; the drilling device further comprises a second servo motor, a first speed reducer and a drilling main shaft, the second servo motor is connected with the first speed reducer, the first speed reducer is connected with the drilling main shaft, the drilling main shaft is supported through a rolling bearing in the main shaft box, a central conical blind hole is formed in the end face of the drilling main shaft, a rectangular blind hole matched with the central conical blind hole is formed in the bottom of the central conical blind hole, and the rectangular blind hole is matched with the flat tail of the drill bit to transmit torque.

Preferably, the outer contour of the fan-shaped connecting plate and the spigot of the tank turret mounting seat ring form clearance fit, two through cylindrical holes are formed in the fan-shaped connecting plate, and the crossbeam is fixed on the mounting surface of the tank turret mounting seat ring through bolts; the beam is a diamond square tube, a vertical cylindrical hole is formed in the beam, the axis of the hole is coincident with the vertical central line of the beam, and a rolling bearing is installed in the vertical hole of the beam.

Preferably, the swing arm is a rectangular square tube, the third rolling guide rail and the fourth rolling guide rail are both parallel to the center line of the swing arm, and the axis of the second lead screw is located in the symmetrical plane of the third rolling guide rail and the fourth rolling guide rail; the first rolling guide rail and the second rolling guide rail are parallel to each other and are both vertical to the third rolling guide rail, and the axis of the first lead screw is positioned in the symmetrical plane of the first rolling guide rail and the second rolling guide rail; the axis of the drilling spindle is parallel to the first rolling guide rail and the second rolling guide rail, the spindle box is provided with a vertical cylindrical hole, rolling bearings are arranged at two ends of the cylindrical hole, and a shell of the first speed reducer is fixed on the end face of the spindle box.

Preferably, the first servo motor, the second servo motor, the third servo motor and the fourth servo motor are all electrically connected with the electric control system, each servo motor is internally provided with an encoder and is provided with a band-type brake, and the fourth servo motor is provided with a drilling feed speed mode and a fast forward and fast backward mode.

Preferably, the coordinate system origin setting process is as follows: and adjusting the central line of the swing arm to be perpendicular to the central line of the crossbeam, so that the slide base moves to the limit position closest to the central line of the crossbeam, the spindle box is positioned at the upper limit position, the intersection point position of the axis of the drilling spindle and the lower end surface of the drilling spindle is set as the origin of coordinates, and the indication values of the built-in encoders of the first servo motor, the third servo motor and the fourth servo motor are set as 0.

On the other hand, the invention also provides a method for machining the positioning pin hole of the tank seat ring by using the drilling machine for the positioning pin hole of the tank seat ring, which comprises the following steps:

s1, hoisting the positioning pin holes of the tank seat ring to the mounting surface of the gun tower mounting seat ring of the tank by using a drilling machine through a crown block, adjusting the positions to enable four penetrating cylindrical holes on the fan-shaped connecting plate to be coaxial with corresponding cylindrical holes on the gun tower mounting seat ring, and fixing the positioning pin holes of the tank seat ring and the gun tower mounting seat ring of the tank together by using the drilling machine; s2, mounting the drill on the drilling main shaft, and starting the electric control system to enable the intersection point of the axis of the drilling main shaft and the lower end surface to be located at the origin position of a coordinate system; s3, starting the first servo motor, driving the swing arm to rotate to a set angle through the swing shaft, and braking and locking the first servo motor; s4, starting the third servo motor, driving the sliding seat to move to a set position through the second speed reducer, the second lead screw and the second nut, and braking and locking the third servo motor; s5, starting the fourth servo motor according to fast forward and fast backward, driving the spindle box to move to a set position through the third speed reducer, the first lead screw and the first nut, and changing the fourth servo motor into a drilling feed speed mode; and S6, starting the second servo motor, driving the drill bit to rotate through the first speed reducer and the drilling spindle, starting the fourth servo motor according to a fast forward and fast backward mode after the processed hole reaches the processing depth, enabling the spindle box to return to the original position quickly, braking the fourth servo motor and the second servo motor, and finishing processing the positioning pin hole.

Compared with the prior art, the invention has the following advantages:

the automatic machining device can realize the automatic machining of the positioning pin holes of the tank seat ring, improve the machining quality of the positioning pin holes, reduce the labor intensity of workers and ensure the consistency of the product quality.

Drawings

FIG. 1 is a top view of a drilling machine for machining a positioning pin hole of a tank race according to the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1 of the present invention;

FIG. 3 is a cross-sectional view B-B of FIG. 2 of the present invention; and

fig. 4 is a cross-sectional view C-C of fig. 1 of the present invention.

In the figure:

1. 4-a sector connection plate; 2-a girder; 3-a first servo motor; 5-a main spindle box; 6-a first reducer; 7-a second servo motor; 8-a first rolling-rail slide; 9-a first rolling guide; 10-a slide base; 11-a third servo motor; 12-a second reducer; 13-a first reducer connecting plate; 14-a swing arm; 15-a second rolling guide; 16-a second rolling-track carriage; 17-a fourth servo motor; 18-a third reducer; 19-a second reducer connecting plate; 20. 22-rolling bearings; 21-drilling the main shaft; 23-a first lead screw; 24-a third rolling-track carriage; 25-a third rolling guide; 26-a second lead screw; 27-a fourth rolling-track carriage; 28-a fourth rolling guide; 29-a first nut; 30-a second nut; 31-an electronic control system; 32. 33-rolling bearings; 34-oscillating axis.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains. For the reader's understanding, the device is described in terms of its orientation in fig. 1.

In the schematic diagrams of the drilling machine for machining the positioning pin hole of the tank seat ring shown in the attached drawings 1-4, the drilling machine comprises a steering device, a lifting device, a telescopic device, a drilling device, a fan-shaped connecting plate and an electric control system, the drilling machine comprises the rotational freedom degree of the steering device, the moving freedom degree of the lifting device, the moving freedom degree of the telescopic device and the rotational freedom degree of the drilling device, and the electric control system 31 is positioned on the upper surface of a crossbeam 2. Turning to the device and including girder 2, first servo motor 3 and oscillating axle 34, girder 2 is a rhombus side pipe, fan-shaped connecting plate 1 links firmly in 2 upper surface one sides of girder and the outstanding girder 2 outside, fan-shaped connecting plate 4 links firmly outside 2 opposite side of girder upper surface and the outstanding girder 2, fan-shaped connecting plate 1, 4 outer edge profile and tank gun turret mount pad circle's tang constitute clearance fit, fan-shaped connecting plate 1, respectively have two on 4 to run through the cylinder hole, this hole is used for fixing girder 2 on tank gun turret mount pad circle installation face through the bolt. The girder 2 is provided with a vertical cylindrical hole, the axis of the hole is coincident with the vertical central line of the girder 2, rolling bearings 32 and 33 are installed in the vertical hole of the girder 2, an oscillating shaft 34 is inserted into inner ring holes of the rolling bearings 32 and 33, the upper end of the oscillating shaft 34 is fixedly connected with an output shaft of the first servo motor 3, and the lower end surface of the oscillating shaft 34 is fixedly connected with the upper end surface of an oscillating arm 14 in the lifting device. The first servo motor 3 drives the swing arm 14 to rotate, and the rotation of the lifting device can be realized.

Besides the swing arm 14, the lifting device further comprises a third servo motor 11, a second speed reducer 12, a first speed reducer connecting plate 13, a second lead screw 26, a second nut 30, a third rolling guide rail 25, a third rolling guide rail sliding seat 24, a fourth rolling guide rail 28 and a fourth rolling guide rail sliding seat 27, wherein the swing arm 14 is a rectangular square tube, the third rolling guide rail 25 and the fourth rolling guide rail 28 are fixedly connected to one side surface of the swing arm 14 respectively, the third rolling guide rail sliding seat 24 is slidably mounted on the third rolling guide rail 25, the fourth rolling guide rail sliding seat 27 is slidably mounted on the fourth rolling guide rail 28, and the third rolling guide rail 25 and the fourth rolling guide rail 28 are parallel to each other and are parallel to the central line of the swing arm 14. The first speed reducer connecting plate 13 is fixedly connected to the end face of the swing arm 14 and extends out of the swing arm 14 from one side, a cylindrical hole with the diameter slightly larger than the excircle of the second lead screw 26 is formed in the extending position of the first speed reducer connecting plate 13, the second lead screw 26 penetrates through the cylindrical hole, one end of the cylindrical hole is fixedly connected with the output shaft of the second speed reducer 12, the shell of the second speed reducer 12 is fixed to one end face of the first speed reducer connecting plate 13, the output shaft of the third servo motor 11 is fixedly connected with the input shaft of the second speed reducer 12, and the shell of the third servo motor 11 is fixed to the shell of the second speed reducer 12. The axis of the second lead screw 26 is located in the symmetry plane of the third rolling guide 25 and the fourth rolling guide 28, the second lead screw 26 is engaged with a second nut 30 to form a thread pair, and the second nut 30 is fixed on the side surface of the sliding seat 10 in the telescopic device. When the third servo motor 11 is driven, the movement of the telescopic device can be realized through the transmission of the second speed reducer 12, the second lead screw 26, the second nut 30 and the sliding seat 10.

One side surface of the sliding base 10 is fixedly connected with a third rolling guide rail sliding base 24 and a fourth rolling guide rail sliding base 27 respectively and extends out of the third rolling guide rail sliding base 24 and the fourth rolling guide rail sliding base 27 upwards and downwards, the other side surface of the sliding base 10 is fixedly connected with a first rolling guide rail 9 and a second rolling guide rail 15 respectively, and the first rolling guide rail 9 and the second rolling guide rail 15 are parallel to each other and are perpendicular to a third rolling guide rail 25 and a fourth rolling guide rail 28.

The telescopic device further comprises a fourth servo motor 17, a third speed reducer 18, a second speed reducer connecting plate 19, a first lead screw 23, a first nut 29, a first rolling guide rail sliding seat 8, a first rolling guide rail 9, a second rolling guide rail 15 and a second rolling guide rail sliding seat 16, the second speed reducer connecting plate 19 is fixedly connected to the upper end face of the sliding seat 10 and extends out of the sliding seat 10 from one side in a hanging mode, a cylindrical hole with the vertical lead diameter slightly larger than the excircle of the first lead screw 23 is formed in the hanging position of the second speed reducer connecting plate 19, the first lead screw 23 penetrates through the hole, one end of the first lead screw is fixedly connected with the output shaft of the third speed reducer 18, a shell of the third speed reducer 18 is fixed to one end face of the second speed reducer connecting plate 19, the output shaft of the fourth servo motor 17 is fixedly connected with the input shaft of the third speed reducer 18, and the shell of the fourth. A first rolling guide carriage 8 is slidably mounted on the first rolling guide 9 and a second rolling guide carriage 16 is slidably mounted on the second rolling guide 15. The first lead screw 23 is engaged with a first nut 29 to form a screw pair, and the first nut 29 is fixed to one side surface of the headstock 5. The axis of the first threaded spindle 23 lies in the plane of symmetry of the first rolling guide 9 and the second rolling guide 15. When the fourth servo motor 17 is driven, the drilling device can move through the transmission of the third speed reducer 18, the first lead screw 23, the first nut 29 and the spindle box 5.

One side face of a main spindle box 5 in the drilling device is fixedly connected with a first rolling guide rail sliding seat 8 and a second rolling guide rail sliding seat 16 respectively, the drilling device further comprises a second servo motor 7, a first speed reducer 6 and a drilling spindle 21, a vertical cylindrical hole of lead is formed in the main spindle box 5, rolling bearings 20 and 22 are installed in the hole respectively, the drilling spindle 21 is inserted into inner ring inner holes of the rolling bearings 20 and 22, and the lower end of the drilling spindle 21 extends out of the main spindle box 5 in a hanging mode. The axis of the drilling main shaft 21 is parallel to the first rolling guide rail 9 and the second rolling guide rail 15, a central conical blind hole is arranged at the lower part of the drilling main shaft 21, a rectangular blind hole is arranged at the bottom of the conical blind hole, the large end of the central conical blind hole on the drilling main shaft 21 is positioned at the lower end face of the drilling main shaft 21, and the central conical blind hole of the drilling main shaft 21 is communicated with the rectangular blind hole. The central conical blind hole of the drilling main shaft 21 is matched with the outer conical surface of the drill bit, and the rectangular blind hole is matched with the flat tail of the drill bit to transmit torque. The upper end surface of the drilling spindle 21 is fixedly connected with an output shaft of the first speed reducer 6, a shell of the first speed reducer 6 is fixed on the end surface of the spindle box 5, an output shaft of the second servo motor 7 is fixedly connected with an input shaft of the first speed reducer 6, and a shell of the second servo motor 7 is fixed on the shell of the first speed reducer 6.

The first servo motor 3, the second servo motor 7, the third servo motor 11 and the fourth servo motor 17 are electrically connected with an electric control system 31.

The first servo motor 3, the second servo motor 7, the third servo motor 11 and the fourth servo motor 17 are all internally provided with encoders and are provided with band-type brakes.

The fourth servo motor 17 has two speed output modes: 1) a drilling feed speed mode; 2) fast forward and fast reverse mode.

Setting the origin of a coordinate system: the center line of the swing arm 14 is vertical to the center line of the girder 2, the sliding seat 10 is located at the limit position closest to the center line of the girder 2, the spindle box 5 is located at the upper limit position, and the intersection point position of the axis of the drilling spindle 21 and the lower end surface of the drilling spindle 21 is set as the origin of coordinates; at this time, the indication values of the built-in encoders of the first servomotor 3, the third servomotor 11, and the fourth servomotor 17 are 0.

On the other hand, the invention also provides a method for machining the positioning pin hole of the tank seat ring, which specifically comprises the following steps:

as shown in attached figures 1-4, firstly, a drilling machine for a positioning pin hole of the tank seat ring is hung on a mounting surface of a gun tower mounting seat ring of the tank by a crown block, four penetrating cylindrical holes on the fan-shaped connecting plates 1 and 4 are coaxial with corresponding cylindrical holes on the gun tower mounting seat ring by adjusting the position, the drilling machine for the positioning pin hole of the tank seat ring and the gun tower mounting seat ring of the tank are fixed together by four bolts, and a drill bit is mounted on a drilling main shaft 21. And starting an electric control system to enable the intersection point of the axis of the drilling main shaft 21 of the drilling machine for the tank seat ring positioning pin hole and the lower end surface to be located at the original point position of the coordinate system.

Starting the first servo motor 3, driving the swing arm 14 and all components connected with the swing arm to rotate to a first pin hole position according to the set parameters in the control system through the swing shaft 34, and braking and locking the first servo motor 3;

starting a third servo motor 11, driving the sliding seat 10 and all components connected with the sliding seat to move to a first pin hole position according to the set parameters in the control system through a second speed reducer 12, a second lead screw 26 and a second nut 30, guiding a third rolling guide rail 25 and a fourth rolling guide rail 28, and braking and locking the third servo motor 11;

starting a fourth servo motor 17 in a fast forward mode, driving the spindle box 5 and all components connected with the spindle box to move to a position where a drill bit is close to the surface of a machined part according to the set parameters in the control system by a third speed reducer 18, a first lead screw 23 and a first nut 29, guiding by a first rolling guide rail 9 and a second rolling guide rail 15, and changing the fourth servo motor 17 into a drilling feed speed mode;

and simultaneously, the second servo motor 7 is started, and the drill bit is driven to rotate through the first speed reducer 6 and the drilling spindle 21. When the machined hole reaches the machining depth, the fourth servo motor 17 is started in a fast-moving mode, the spindle box 5 and all components connected with the spindle box are driven to quickly return to the original position through the third speed reducer 18, the first lead screw 23 and the first nut 29, the fourth servo motor 17 and the second servo motor 7 brake, and the machining of the first pin hole is completed. The process of machining and adjusting the second pin hole is similar to the first pin hole, and is not described in detail.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.