Numerical control tailstock drilling device

Abstract

The utility model discloses a numerical control tailstock drilling device which comprises a stepping motor, a cycloidal impeller speed reducer, a counting damping gear shifting system, an output shaft lead screw structure, a data acquisition feedback unit, a PLC man-machine interaction system and a driving power supply distribution system. The left end face of a motor stator of the stepping motor is connected with a transition flange through a penetrating bolt, and the bolt penetrates through the motor stator and then is connected with a motor rear end cover on the right end face of the motor stator. A motor input main shaft of the stepping motor is sleeved in a transition flange, a rear end cover and a motor stator through a first bearing, a second bearing and a motor rotor; the cycloidal impeller speed reducer is composed of a transition flange, a 19-tooth fixed wheel, a 20-tooth cycloidal wheel, a transmission disc, a shifting steel needle sleeve, a shifting steel needle, a third bearing, a fourth bearing and a fifth bearing. The tailstock is reliable, durable, easy to operate and flexible, and can be suitable for a three-axis linkage horizontal numerical control lathe and a tailstock of a common horizontal lathe.

Description

Technical Field

[0001] This utility model belongs to the field of drilling technology, specifically relating to a CNC tailstock drilling device that can be installed on the tailstock of an existing horizontal lathe. Background Technology

[0002] Currently, only mid-to-high-end slant-bed horizontal CNC lathes use hydraulic power for their tailstocks. Three-axis linkage horizontal CNC lathes, ordinary lathes, and even some slant-bed horizontal CNC lathes still rely on manual operation for their tailstocks. Hydraulic systems require complex and bulky pump stations and oil pipelines to support the power, and the tailstock slide distance needs to be measured and controlled by a linear encoder. The high cost and complex control systems prevent the hydraulic power system from being universally applicable to the tailstocks of other horizontal bed lathes. Therefore, this invention provides a CNC tailstock drilling device. Summary of the Invention

[0003] The purpose of this utility model is to provide a CNC tailstock drilling device that can be installed on the tailstock of an existing horizontal lathe to solve the problems of existing lathes relying on manual operation or high cost, thereby saving the physical strength of operators and improving production efficiency.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a CNC tailstock drilling device, comprising: a stepper motor, a cycloidal impeller reducer, a counting and damping shifting system, a data acquisition and feedback unit, a PLC human-machine interface system, and a drive power distribution system; wherein...

[0005] The left end face of the stepper motor stator is connected to the transition flange by a through bolt. After the bolt passes through the stator, it connects to the rear end cover of the motor on the right end face of the stator. The input spindle of the stepper motor is fitted with bearing No. 1, bearing No. 2, and the motor rotor in the transition flange, the rear end cover, and the stator. The input spindle includes an eccentric section with an eccentricity of 3mm and a helical spline section inside the cycloidal impeller reducer. A straight spline section and a smooth shaft section extend outside the rear end cover of the motor.

[0006] A hand crank is fitted on the extension section of the motor input spindle near the rear end cover of the motor. The left section of the inner hole of the hand crank is a straight internal spline, and the right section of the inner hole is fitted with a tight-fitting copper sleeve. The inner hole of the copper sleeve is dynamically fitted on the outer circle of the optical shaft section of the motor input spindle, allowing it to rotate freely and slide left and right. A return spring is fitted on the outer circle of the straight spline section of the motor input spindle that extends out of the rear end cover of the motor. Under the thrust of the return spring, the hand crank and the copper sleeve are normally in the optical shaft section position and do not rotate with the motor input spindle. There is a threaded hole in the center of the right end face of the optical shaft section. The spindle end baffle is fitted on the baffle screw and tightened in the threaded hole in the center of the right end face of the optical shaft section, preventing the hand crank from falling off. When the motor is in standby or off state, the hand crank can be pushed to the left manually, and the left side of the hand crank's internal spline can be fitted onto the straight spline section of the spindle, allowing the motor input spindle to be rotated manually.

[0007] The cycloidal impeller reducer consists of an transition flange, a 19-tooth fixed wheel, a 20-tooth cycloidal wheel, a transmission disc, a chuck sleeve, a chuck needle, a No. 3 bearing, a No. 4 bearing, a small magnetic ring, a No. 5 bearing, and a main housing. The 19-tooth fixed wheel is bolted to the outer circle of the boss on the left end face of the transition flange. The 20-tooth cycloidal wheel is mounted on the eccentric section of the motor input shaft via the No. 3 bearing. The transmission disc is mounted in the main housing via the No. 5 bearing. The inner hole of the transmission disc houses the No. 4 bearing and the small magnetic ring. The No. 4 bearing is mounted on... The motor input spindle is located on the left side of the eccentric section, which supports the eccentric section. The small magnetic ring is also fitted in the inner hole of the transmission disk and blocked by the No. 4 bearing. It attracts the ratchet at the right end of the counter and position damping shifting sleeve. The end face of the transmission disk is provided with a through hole, and a moving steel needle is inserted into each through hole. The moving steel needle has a 9mm extension section on the right end face of the transmission disk. A moving steel needle sleeve is fitted on the outer circle of the moving steel needle on the extension section. The moving steel needle sleeve then extends into the moving hole opened on the end face of the 20-tooth cycloidal wheel.

[0008] The counting and position damping shifting system includes a counting and position damping shifting slide sleeve, a damping spiral guide sleeve connector, a wear ring, a wave spring, a retaining ring for holes, and a spline sleeve connector. The damping spiral guide sleeve connector is fitted inside the right side of the counting and position damping shifting slide sleeve. A wear ring is fitted on the outer circumference of the right side of the damping spiral guide sleeve connector. A circular groove is formed on the outer circumference of the wear ring, corresponding to an anti-rotation fixing steel ball recess inside the counting and position damping shifting slide sleeve. A steel ball is fitted into the anti-rotation fixing steel ball recess to hold the wear ring in place. The circular groove on the bottom of the ring prevents the wear ring from rotating within the counter position damping shifting sleeve. A wave-shaped spring and a retaining ring for holes are fitted on the outer circle of the damping spiral guide sleeve connector on the right end face of the wear ring to press the wear ring and provide frictional damping for the damping spiral guide sleeve connector. The inner spline on the left side of the counter position damping shifting sleeve is fitted onto the outer spline of the spline sleeve connector and can slide a distance of 7mm for shifting. The right-hand spiral inner spline of the damping spiral guide sleeve connector is fitted onto the outer spiral spline section of the motor input spindle.

[0009] The spline sleeve connector is fitted onto the right end of the output shaft spline of the output shaft screw structure; a groove is provided on the outer circle of the output shaft spline near the end, into which a wire retaining ring is inserted to hold the spline sleeve connector in place at the output shaft spline position; a large magnetic ring is fitted onto the outer circle of the left end of the spline sleeve connector; the counter damping shifting sleeve is connected to the transmission disc.

[0010] The data acquisition and feedback unit includes a position proximity switch and a counting proximity switch. The two proximity switches are installed in the position mounting hole and the counting mounting hole in the proximity switch mounting chamber respectively through slotted holes and threads. The position proximity switch is used to determine the position of the counting damping shift sleeve, and the counting proximity switch is used to determine the number of rotations of the counting damping shift sleeve. The position proximity switch and the counting proximity switch are electrically connected to the PLC human-machine interface system. The feedback cables of the two proximity switches pass through a cover plate, a cable conduit connector, a cable conduit, and a cable conduit connector in sequence, and enter from the back of the control box to connect with the PLC human-machine interface integrated machine.

[0011] The PLC human-machine interface system consists of a control box, control button units, and an integrated PLC human-machine interface. Both the control button units and the integrated PLC human-machine interface are equipped with indicator lights. The control button units are encapsulated within the control box, and the integrated human-machine interface is located on one side of the control box. The power supply and control of the drive power distribution system and the PLC human-machine interface system are electrically connected via a main cable conduit. The data acquisition and feedback unit is electrically connected to the PLC human-machine interface system via a feedback cable conduit. The control box is fixedly connected below the stepper motor.

[0012] The drive power distribution system includes a distribution box, a three-wire power input plug, a power switch, a leakage current protection device, a 24V DC switching power supply, a stepper motor driver, and a main cable conduit. The distribution box is connected to the PLC human-machine interface system and the stepper motor via cables.

[0013] Preferably, when the counting and positioning damping shifting system moves 3mm to the left, the ratchet on the right end of the counting and positioning damping shifting slide sleeve disengages from the ratchet on the left end of the transmission disc; then, moving another 4mm to the left, the left end of the damping spiral guide sleeve coupling engages with the right end of the spline sleeve coupling, and the left end face of the counting and positioning damping shifting slide sleeve attracts the right end face of the large magnetic ring. The rotational power of the motor input spindle reaches the output shaft spline from the spiral spline section. At this time, the transmission ratio is 1:1, and direct transmission output occurs.

[0014] Preferably, when the counting and position damping shifting sleeve moves to the left with a transmission ratio of 1:1, and the counting proximity switch senses the right protrusion 8-2 of the counting and position damping shifting sleeve, the counting proximity switch is de-energized and sends a de-energization signal to the PLC human-machine interface system. At this time, the data sensed by the counting proximity switch on the 20 counting grooves on the outer left side of the counting and position damping shifting sleeve is determined to be the no-load travel distance data of the lathe tailstock slide cylinder during rapid retraction or rapid advance, and this data is fed back to the PLC human-machine interface system.

[0015] When the counting and positioning damping shifting sleeve moves to the right with a transmission ratio of 1:20, the position proximity switch senses the concave point 8-3 in the middle of the counting and positioning damping shifting sleeve. The position proximity switch is energized and sends an energization signal to the PLC human-machine interface system. At this time, the data sensed by the counting proximity switch on the 20 counting grooves on the outer left side of the counting and positioning damping shifting sleeve is judged as the drilling depth distance data after the drill bit contacts the workpiece and feeds at a deceleration ratio of 1:20. This data is then fed back to the PLC control system.

[0016] Preferably, when the motor input spindle rotates forward, because the drill bit has not yet contacted the workpiece at the initial stage of each forward start, both the initial forward start and the rapid reverse return are in an unloaded state. The PLC program judges this as the unloaded travel count of the lathe tailstock slide. The unloaded travel count of the rapid forward and rapid return includes the cumulative data of repeated drilling depth advances. Because the left end face of the counting and damping shifting slide sleeve is attracted to the right end face of the large magnetic ring, the right-hand helical spline of the spindle helical spline section cannot temporarily pull the entire counting and damping shifting slide sleeve system back to the right, so the transmission ratio is still 1:1. When the lead screw of the output shaft pushes the slide nut in the lathe tailstock with a 1:1 transmission, causing the slide and drill bit to extend to the left together and contact the workpiece, it encounters resistance. Under the clockwise right rotation of the inner helical spline of the damping helical guide sleeve connector, the left end face of the counting and positioning damping shifting sleeve separates from the right end face of the large magnetic ring, causing the counting and positioning damping shifting system to move 7mm to the right. When it moves 4mm to the right, the damping helical guide sleeve connector separates from the spline sleeve connector. At this time, the spindle helical spline drives the damping helical guide sleeve connector to slide and rotate within the counting and positioning damping shifting sleeve. When it continues to move 3mm to the right, the ratchet at the right end of the counting and positioning damping shifting sleeve meshes with the ratchet at the left end of the transmission disc. At this time, the transmission ratio is 1:20, and the speed reduction transmission output is used. The PLC program judges that the drill bit has contacted the workpiece and counts the drilling depth, which includes the data of repeated drilling depth increments.

[0017] Preferably, there are 6 through holes, evenly spaced on the transmission disc, with a diameter of 6mm; the outer diameter of the actuating steel needle sleeve is 10mm, and the diameter of the actuating hole on the end face of the 20-tooth cycloidal wheel is 13mm.

[0018] Preferably, the cycloidal impeller reducer is driven by the eccentric section of the input shaft of the motor to rotate, which drives the 20-tooth cycloidal wheel to oscillate around the 19-tooth fixed wheel in a tooth-crossing reduction motion. When the eccentric section rotates once, the 20-tooth cycloidal wheel oscillates around the 19-tooth fixed wheel once, crossing one tooth. When the eccentric section rotates twenty times, the 20-tooth cycloidal wheel oscillates around the 19-tooth fixed wheel twenty times and also crosses twenty teeth, the 20-tooth cycloidal wheel has rotated once, achieving a reduction ratio of 1:20. The six actuating holes of the 20-tooth cycloidal wheel transmit power to the six actuating steel needle sleeves and actuating steel needles of the transmission disc, thus completing the work of the cycloidal impeller reducer mechanism.

[0019] Preferably, the main housing is a cycloidal impeller reducer housing, which is fitted onto the outside of the cycloidal impeller reducer. The main housing is provided with a position mounting hole, a counter mounting hole, a slotted hole, a proximity switch mounting chamber, a slotted mounting countersunk hole, an oil inlet, and an oil level observation window. The slotted hole is designed to facilitate the installation of the position proximity switch and the counter proximity switch. After the position proximity switch and the counter proximity switch are installed, the slotted hole is plugged with a plug. The oil inlet is used to inject lubricating oil into the cycloidal impeller reducer, and the oil level observation window is used to observe the amount of lubricating oil inside the cycloidal impeller reducer.

[0020] Preferably, the output shaft lead screw structure includes an output shaft, a No. 6 bearing, a copper washer, and a lock nut. One end of the output shaft, with the No. 6 bearing fitted on its outer diameter, is inserted into a stepped hole on the left end face of the main housing. The section of the output shaft extending to the right of the stepped hole consists of a threaded section and a splined section. A copper washer is fitted on the threaded section close to the right side of the stepped hole. A lock nut is screwed onto the positioning step of the output shaft on the right end face of the copper washer, but it does not press against the copper washer, the stepped hole of the main housing, or the No. 6 bearing. The output shaft, the No. 6 bearing, the copper washer, and the lock nut can rotate within the stepped hole of the main housing but will not move left or right.

[0021] This utility model device has two modes: manual control and automatic control. If manual control mode is selected, the stepper motor speed needs to be set to the same speed as the workpiece, and then the start button is pressed to start drilling. If automatic control mode is selected, the stepper motor speed, drilling depth, and the appropriate sub-mode corresponding to the drill bit diameter based on the drilling depth need to be set. There are three sub-modes: drill bit diameter 10-25mm graded completion, drill bit diameter 26-40mm graded completion, and drill bit diameter ≥41mm completed in one pass. Among them, drill bit diameter 10-25mm graded completion and drill bit diameter 26-40mm graded completion are unequal step retraction modes, and drill bit diameter ≥41mm completed in one pass is a non-retraction mode completed in one pass.

[0022] The cycloidal impeller reducer combines the pin housing and the toothed pin into an internal toothed ring with internal wave-shaped teeth to achieve the purpose of reducing size without sacrificing torque. The counting and position damping shifting system is an automatic shifting mechanism designed according to the working principle of this device under the drive of a stepper motor. The working principle is explained as follows: When the gear ratio is 1:1, the input shaft and the output shaft are at the same speed. The output shaft lead screw pitch is 5mm per revolution. Each revolution of the output shaft is equal to the movement of the lathe tailstock slide cylinder by 5mm. When the gear ratio is 1:20, the input shaft rotates 1 revolution, the output shaft rotates 0.05 revolutions, and the tailstock slide cylinder moves a distance of 0.25mm, that is: 1 / 20*5=0.25mm, thereby achieving the purpose of deceleration drilling.

[0023] This utility model has at least the following beneficial effects:

[0024] 1. This utility model has the characteristics of novel design, compact structure, reliable and durable, easy operation and flexible, and two axes collinear and in the same direction. It can be applied to the tailstock of 3-axis linkage horizontal CNC lathe and ordinary horizontal lathe.

[0025] 2. This utility model adopts an unequal step retraction mode, which greatly improves the efficiency of drilling deep holes compared with other conventional CNC drilling equal step retraction modes. That is, the drilling depth decreases step by step and the chip removal frequency increases. This gives the lathe tailstock an intelligent and flexible automatic drilling capability, greatly saving working time. One person can operate multiple machines, saving manual labor and greatly improving the production efficiency of the machine tool processing industry.

[0026] 3. During the working process, after drilling a workpiece, there is no need for positioning and clamping when changing to the next workpiece. The position of the moved tailstock can be reset and locked each time within the required drilling stroke range, including the limit position range at both ends of the tailstock slide. There is no need to constrain the precise distance between the workpiece and the drill bit. This device can start and count drilling at any point within the limit position stroke range at both ends of the tailstock slide.

[0027] 4. This utility model removes the needle housing and toothed needle of the traditional cycloidal pinwheel reducer and replaces them with inner wavy teeth, which are used as oscillating wheels to oscillate and rotate around the outer wavy fixed wheel, so as to achieve the purpose of the input shaft and output shaft moving in the same direction. At the same time, it is much smaller in size than the traditional cycloidal pinwheel reducer and the structure is much simpler. Attached Figure Description

[0028] Figure 1 The figure shows a cross-sectional view of a stepper motor, a cycloidal impeller reducer, and a counting and positioning damping shifting system (the central components are the motor input spindle 1, eccentric section 1A, spiral spline section 1B, straight spline section 1C, smooth shaft section 1D, output shaft 13, output shaft spline 13A, motor rotor 28, and hand crank return spring 34, which are not shown in cross-section for ease of observation).

[0029] Figure 2 Exploded view of the cycloidal impeller reducer (excluding the motor shaft);

[0030] Figure 3 This is an exploded structural diagram of a counter-position damping shifting system;

[0031] Figure 4 An exploded schematic diagram of a stepper motor, a cycloidal impeller reducer, and a counting and position damping shifting system;

[0032] Figure 5 Diagram showing the installation location of the main unit's data acquisition and feedback unit and the sensing areas of the two proximity switches;

[0033] Figure 6 An exploded diagram showing the installation chamber for the main unit's data acquisition and feedback unit, connected to the aluminum alloy control box e via a proximity switch cable conduit.

[0034] Figure 7 The diagram shows the engagement and disengagement of the damping spiral guide sleeve connector and the spline sleeve connector. In the diagram: A is the state where the two connectors are separated; B is the state where the ratchet meshing transmission ratio is 1:20; C is the state where the sensing point of the position counting proximity switch is energized; D is the state where the counting proximity switch counts the drilling depth; E is the 7mm area where the large magnetic ring slides when it engages and disengages the counting and position damping shifting system.

[0035] Figure 8 The diagram shows the state of the damping spiral guide sleeve connector and the spline sleeve connector. In the diagram: F is the state of the two connectors being connected, G is the state of the ratchet being separated with a transmission ratio of 1:1, H is the state of the position proximity switch sensing protrusion being de-energized, and I is the state of the counting proximity switch counting the fast retreat distance or fast advance distance.

[0036] Figure 9 This is a schematic diagram of the present invention. In the figure: a-slot-shaped mounting countersunk hole, b-oil inlet, c-oil level observation window, d-stepper motor, e-aluminum alloy control box, f-control button, g-display screen, h-screen operation indicator light;

[0037] Figure 10 This is an assembly diagram of the present invention and the lathe tailstock;

[0038] Figure 11 This diagram shows the connection between the stepper motor, the PLC human-machine interface system, and the drive power distribution system of this utility model. Detailed Implementation

[0039] Embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the present invention. Where specific techniques, connections, or conditions are not specified in the embodiments, they are performed in accordance with the techniques, connections, or conditions described in the literature in the art or according to the product instructions. Materials, instruments, or equipment used without specified manufacturers are all conventional products that can be obtained through purchase.

[0040] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] See Figures 1-11 As shown, the present invention provides a CNC tailstock drilling device, comprising: a stepper motor, a cycloidal impeller reducer, a counting and positioning damping shifting system, a data acquisition and feedback unit, a PLC human-machine interaction system, and a drive power distribution system.

[0042] The drilling power of this utility model device is provided by a stepper motor. The left end face of the stepper motor stator 27 is connected to the transition flange 30 by four through bolts. After the bolts pass through the stator 27, they are connected to the rear end cover 31 of the motor on the right end face of the stator. The motor input spindle 1 of the stepper motor is fitted into the transition flange 30, the rear end cover, and the stator 27 by bearings 21 and 22 and the motor rotor 28. The motor input spindle 1 includes an eccentric section 1A with an eccentricity of 3mm and a spiral spline section 1B within the cycloidal impeller reducer. A hand crank section with a straight spline section 1C and a smooth shaft section 1D extends out from outside the rear end cover of the motor.

[0043] A hand crank 35 is fitted on the extension of the input spindle 1 near the rear end cover of the motor. The left section of the inner hole of the hand crank is a straight internal spline, and the right section of the inner hole is fitted with a tight-fitting copper sleeve 36. The inner hole of the copper sleeve is dynamically fitted on the outer circle of the optical shaft section 1A of the motor spindle, allowing it to rotate freely and slide left and right. A return spring 34 is fitted on the outer circle of the straight spline section 1C of the motor spindle extending out of the rear end cover 31 of the motor. Under the thrust of the return spring, the hand crank 35 and the copper sleeve 36 are in the optical shaft section 1D position and do not rotate with the motor input spindle 1. There is a threaded hole at the center of the right end face of the optical shaft section 1D. The spindle end baffle 37 is fitted on the baffle screw 38 and tightened in the threaded hole at the center of the right end face of the optical shaft section 1D, preventing the hand crank 35 from falling off. When the motor is not running, the hand crank can be pushed to the left by hand, and the left side of the hand crank's internal spline can be fitted onto the straight spline section 1C of the spindle, allowing the motor input spindle 1 to be rotated by hand.

[0044] The cycloidal impeller reducer consists of an transition flange 30, a 19-tooth fixed wheel 3, a 20-tooth cycloidal wheel 2, a transmission disc 4, a paving steel needle sleeve 5, a paving steel needle 6, bearing No. 3 23, bearing No. 4 24, and bearing No. 5 25. The 19-tooth fixed wheel 3 is fixed to the outer circle of the boss on the left end face of the transition flange 30 by four 5mm bolts. The 20-tooth cycloidal wheel 2 is mounted on the eccentric section 1A of the motor input shaft with a 3mm eccentricity through bearing No. 3 23. When the stepper motor input shaft rotates one revolution, the eccentric section drives the cycloidal wheel to swing once, and at the same time, the 20-tooth inner teeth of the cycloidal wheel will rotate on the fixed wheel. One tooth crosses over the 19-tooth external tooth, and the cycloidal wheel rotates 1 / 20 of a revolution around the fixed wheel. That is, when the stepper motor input spindle rotates 20 revolutions, the cycloidal wheel rotates one revolution to achieve a reduction ratio of 1:20. The end face of the transmission disk 4 is provided with a through hole, and a paving steel needle is inserted into each through hole. The paving steel needle has a 9mm extension section on the right end face of the transmission disk 4. A paving steel needle sleeve 5 is fitted on the outer circle of the paving steel needle on the extension section. The paving steel needle sleeve then extends into the paving hole opened on the end face of the 20-tooth cycloidal wheel 2. The cycloidal impeller reducer is installed between the main housing 29 and the motor stator 27.

[0045] The counting and position damping shifting system includes a counting and position damping shifting slide sleeve 8, a damping spiral guide sleeve connector 7, a wear-bearing ring 11, a wave spring 9, a retaining ring for holes 10, and a spline sleeve connector 12. The damping spiral guide sleeve 7 is fitted inside the right side of the counting and position damping shifting slide sleeve 8, and the wear-bearing ring 11 is fitted on the outer right side of the damping spiral guide sleeve connector 7. A circular groove 11-1, 2.2 mm wide and 1 mm deep, is formed on the outer circumference of the wear-bearing ring 11. The circular groove 11-1 corresponds to the counting... The counter position damping shift sleeve 8 contains an anti-rotation fixing steel ball recess 8-1, which is equipped with a 2mm diameter steel ball. This allows the wear ring 11 to rotate together with the counter position damping shift sleeve 8 without restricting the axial movement of the wear ring 11. A wave-shaped spring 9 and a retaining ring 10 are fitted onto the damping spiral guide sleeve 7 on the right end face of the wear ring 11 to press against it, creating a frictional damping engagement between the wear ring and the counter position damping shift sleeve 8. This rotation... The frictional damping force is designed relative to the inner helical spline of the damping helical guide sleeve connector 7 and the outer helical spline segment 1B of the motor input spindle. Its function is that when the left end of the damping helical guide sleeve connector 7 separates from the spline sleeve connector 12, and the ratchet of the counter-position damping shift sleeve 8 and the transmission disc are not engaged, the damping helical guide sleeve connector 7 is in a sliding rotation state within the counter-position damping shift sleeve 8. Therefore, the outer helical spline segment 1B of the motor input spindle cannot simply... The forward rotation of the damping spiral guide sleeve connector 7 and the counting and positioning damping shifting sleeve 8 pulls them back to the right. However, the wave spring 9 applies a certain pressure to the wear ring 11 and the damping spiral guide sleeve connector 7, which generates a friction damping force on the inner platform of the counting and positioning damping shifting sleeve 8. Only then can the spiral spline section 1B of the motor input spindle pull the entire counting and positioning damping shifting sleeve back to the right by 3mm, so that the ratchet at the right end of the counting and positioning damping shifting sleeve 8 meshes with the ratchet at the left end of the transmission disc 4.

[0046] The damping force of the counting and positioning damping shift sleeve 8 is of two types: the first is the aforementioned rotational friction damping force, and the second is the attraction of the large magnetic ring 15 to the left end face of the counting and positioning damping shift sleeve 8. This attraction damping force prevents the spiral spline section 1B of the motor input spindle from pulling the entire counting and positioning damping shift sleeve back to the right when it is rotating forward under no-load conditions. The rotational friction damping force is slightly greater than the attraction force of the large magnetic ring. When the drill bit contacts the workpiece, before the counting and positioning damping shift sleeve 8 slips off from the damping spiral guide sleeve connector 7, the two connectors and the left end face of the counting and positioning damping shift sleeve 8 are separated from the large magnetic ring. That is, the spiral spline section 1B of the motor input spindle is obstructed during forward rotation under no-load conditions, pulling the entire counting and positioning damping shift sleeve back to the right by 7mm. When the spiral spline section 1B of the motor input spindle reverses, it easily pushes the entire counting and positioning damping shift sleeve to the left by 7mm.

[0047] The left inner spline of the counter and position damping shifting slide sleeve 8 is fitted onto the outer spline of the spline sleeve connector 12 and can slide 7mm to the left and right for shifting and transmitting power to the output shaft 13; the inner hole of the damping spiral guide sleeve connector 7 is a right-hand spiral inner spline, and the right-hand spiral inner spline of the damping spiral guide sleeve connector 7 is fitted onto the outside of the spiral spline section 1B of the motor input spindle 1;

[0048] The inner hole of the spline sleeve connector 12 is a straight internal spline. The straight internal spline of the spline sleeve connector 12 is fitted outside the output shaft spline 13A on the right end of the output shaft 13. A groove is provided on the outer circle of the output shaft spline 13A near the end. The wire retainer 14 is inserted into the groove to lock the spline sleeve connector 12 in the position of the output shaft spline 13A and prevent it from moving. A large magnetic ring 15 is fitted on the outer circle of the left end of the spline sleeve connector 12. When the motor input spindle 1 reverses, the spiral spline segment 1B is pushed to the left by the frictional damping force generated between the damping spiral guide sleeve connector 7 and the counting and position damping shifting slide sleeve 8. The counting and position damping shifting slide sleeve 8 is connected to the transmission disc 4.

[0049] The data acquisition feedback unit includes a position proximity switch 17 and a counting proximity switch 18. The two proximity switches are cylindrical with external threads. After passing through the slotted hole 29-3, the two proximity switches are respectively installed in the position mounting hole 29-1 and the counting mounting hole 29-2 in the proximity switch mounting chamber 29-4. The position proximity switch 17 is used to determine the position of the counting damping shift sleeve 8, and the counting proximity switch 18 is used to determine the number of rotations of the counting damping shift sleeve 8. The position proximity switch 17 and the counting proximity switch 18 are electrically connected to the PLC human-machine interface system. The feedback cables of the two proximity switches pass sequentially through the cover plate 40, the first cable conduit connector 39A, the main cable conduit, and the second cable conduit connector 39B, and enter from the back of the control box e to connect with the PLC human-machine interface integrated machine g.

[0050] The PLC human-machine interface system consists of a control box, an integrated PLC human-machine interface unit, and control button units. The integrated PLC human-machine interface unit and control button units are encapsulated within the control box, with the human-machine interface located on one side of the control box. The PLC human-machine interface system is an integrated unit combining an existing PLC programmable logic controller and a programmable LCD resistive touchscreen display. A pre-written, fixed 1885-step automatic and manual control program is downloaded into the PLC programmable logic controller, and user-operated option buttons are programmed into the human-machine interface. The control box has mounting slots for the start, stop, and rewind control buttons, as well as mounting holes for the main cable conduit and feedback cable conduit. The main cable conduit establishes the electrical connection between the drive power distribution system and the PLC human-machine interface system for power supply and control. The feedback cable conduit and cable connector 39C establish the electrical connection between the data acquisition feedback unit and the PLC human-machine interface system for data acquisition, feedback, and control. A stepper motor is fixedly connected to the control box with bolts.

[0051] The drive power distribution system includes a distribution box, which is connected to the PLC human-machine interface system and the stepper motor via cables. The distribution box contains a 220V power supply line, a power switch, a leakage current protection switch, a 24V DC-DC switching power converter, and a 220V stepper motor pulse power generator driver. These electrical devices are existing technology. The leakage current protection switch automatically trips when the current reaches 30 mA in the case of leakage current through the grounded metal casing, protecting the operator. The 220V stepper motor pulse power generator driver decomposes the continuous 220V current into 3200 pulse segments required for each revolution of the stepper motor, supplying power for its rotation. The drive power distribution system is connected to the PLC human-machine interface system and the stepper motor by a 12-core cable; the 24V DC switching power converter is the power supply unit of the PLC human-machine interface system, the PLC human-machine interface system is the control unit of the 220V stepper motor pulse power generator driver, and the 220V stepper motor pulse power generator driver is the power supply unit of the stepper motor.

[0052] When the counting and positioning damping shifting system moves 3mm to the left, the ratchet on the right end of the counting and positioning damping shifting slide sleeve 8 disengages from the ratchet on the left end of the transmission disc 4; then, moving another 4mm to the left, the left end of the damping spiral guide sleeve coupling 7 engages with the right end of the spline sleeve coupling 12, and the left end face of the counting and positioning damping shifting slide sleeve 8 attracts the right end face of the large magnetic ring 15. The rotational power of the motor input spindle 1 travels from the spiral spline section 1B through the two couplings to the output shaft spline 13A. At this time, the transmission ratio is 1:1, and the output is directly driven.

[0053] When the counting and position damping shift sleeve 8 moves to the left, the transmission ratio is 1:1. When the counting proximity switch 17 senses the right protrusion 8-2 of the counting and position damping shift sleeve 8, the counting proximity switch 17 is de-energized and sends a de-energization signal to the PLC human-machine interaction system. At this time, the data sensed by the counting proximity switch 18 on the 20 counting grooves on the outer left side of the counting and position damping shift sleeve 8 is judged as the no-load travel distance data of the lathe tailstock slide cylinder during rapid return or rapid advance, and this data is fed back to the PLC human-machine interaction system.

[0054] When the counting and positioning damping shift sleeve 8 moves to the right with a transmission ratio of 1:20, the position proximity switch 17 is energized when it senses the concave point 8-3 in the middle of the counting and positioning damping shift sleeve 8 and sends an energization signal to the PLC human-machine interaction system. At this time, the data sensed by the counting proximity switch 18 on the 20 counting grooves on the outer left side of the counting and positioning damping shift sleeve 8 is judged as the drilling depth distance data after the drill bit contacts the workpiece and feeds at a deceleration ratio of 1:20, and the data is fed back to the PLC control system.

[0055] When the motor input spindle 1 rotates clockwise, the drill bit has not yet contacted the workpiece at the beginning of each clockwise start, so it runs under no-load conditions at the beginning of the clockwise start. Because the left end face of the counter-position damping shift sleeve 8 is attracted to the right end face of the large magnetic ring 15, the right-hand spiral spline of the spindle helical spline section 1A cannot temporarily pull the entire counter-position damping shift sleeve back to the right, so the transmission ratio remains 1:1. When the lead screw of the output shaft 13 pushes the slide nut in the lathe tailstock with a 1:1 transmission, causing the slide and drill bit to extend to the left together and contact the workpiece, it encounters resistance. At this point, the damping screw in the spindle helical spline section 1A... Under the clockwise right rotation of the inner spiral spline of the rotary guide sleeve connector 7, the left end face of the counter position damping shift sleeve 8 separates from the right end face of the large magnetic ring 15, causing the counter position damping shift system to move 7mm to the right. When it moves 4mm to the right, the damping spiral guide sleeve connector 7 separates from the spline sleeve connector 12. At this time, the main shaft spiral spline 1A drives the damping spiral guide sleeve connector 7 to slide and rotate within the counter position damping shift sleeve 8. When it continues to move 3mm to the right, the ratchet at the right end of the counter position damping shift sleeve 8 meshes with the ratchet at the left end of the transmission disc 4. At this time, the transmission ratio is 1:20, and the speed reduction transmission output is achieved.

[0056] There are 6 through holes, evenly spaced on the transmission disc 4, with a diameter of 6mm. The outer diameter of the actuating steel needle sleeve is 10mm, and the diameter of the actuating hole on the end face of the 20-tooth cycloidal wheel 2 is 13mm. The 3mm difference provides the activity area for the cycloidal wheel to swing. When the cycloidal wheel swings and rotates, it transmits power to the transmission disc through the six actuating holes to realize the transmission of power to the next system of damping shifting system.

[0057] The cycloidal impeller reducer is driven by the rotation of the eccentric section 1A of the motor input spindle 1, which rotates to drive the 20-tooth cycloidal wheel 2 to oscillate around the 19-tooth fixed wheel 3, performing a tooth-crossing reduction motion. When the eccentric section 1A rotates once, the 20-tooth cycloidal wheel 2 oscillates around the 19-tooth fixed wheel 3 once, crossing one tooth. When the eccentric section rotates twenty times, the 20-tooth cycloidal wheel 2 oscillates around the 19-tooth fixed wheel 3 twenty times, also crossing twenty teeth, and the 20-tooth cycloidal wheel 2 completes one rotation, achieving a reduction ratio of 1:20. The six actuating holes of the 20-tooth cycloidal wheel 2 transmit power to the six actuating steel needle sleeves 5 and actuating steel needles 6 of the transmission disc 4, completing the work of the cycloidal impeller reducer mechanism. The left end of the motor input spindle 1 has a 10mm diameter and 12mm long protrusion that is inserted into the hole at the right end of the output shaft 13, providing a certain degree of stability to the output shaft 13.

[0058] In the accessories of this utility model, the 20-tooth cycloidal impeller 2, the 19-tooth fixed impeller 3, the damping spiral guide sleeve connector 7, the wear-bearing ring 11, and the counting and position damping shifting slide sleeve 8 are made of GCr15 wear-resistant alloy bearing steel.

[0059] Further optimization of the design: the device has two control modes: manual and automatic. In manual mode, the stepper motor speed must be set to match the workpiece speed before pressing the start button to begin drilling. In automatic mode, the stepper motor speed, drilling depth, and the appropriate sub-mode based on the drill bit diameter must be set. There are three sub-modes: 10-25mm drill bit diameter (graded completion), 26-40mm drill bit diameter (graded completion), and ≥41mm drill bit diameter (one-pass completion). The 10-25mm and 26-40mm drill bit diameter (graded completion) are unequal-step retraction modes, while the ≥41mm drill bit diameter (one-pass completion) is a non-retraction, one-pass completion mode.

[0060] In one embodiment, if manual control mode is selected, simply set the stepper motor speed to be the same as the workpiece speed, and then press the start button to drill. After starting, because the large magnetic ring 15 is attracted to the counter-position damping shifting sleeve 8 and cannot slide to the right, the tailstock slide and drill bit are obstructed when they quickly extend to contact the workpiece at a 1:1 transmission ratio. At this time, the spiral spline section 1B at the left end of the motor input spindle 1 rotates and pulls the wear ring 11 and the damping spiral guide sleeve coupling 7, which are subjected to the pressure of the wave spring 9. This causes the left end face of the counter-position damping shifting sleeve 8 to detach from the right end face of the large magnetic ring 15, moving the entire counter-position damping shifting system to the right to detach from the two couplings. Then, the small magnetic ring... Under the adsorption force of ring 16, it fully engages with the ratchet on the left end face of transmission disc 4. At this time, the 1:1 direct drive is automatically shifted to a 1:20 reduction drive for drilling. When drilling is completed, press the stop button and then press the fast return button. When the motor reverses, the wear ring 11, which is subjected to the pressure of the wave spring 9, causes the counting and position damping shifting sleeve 8 and the damping spiral guide sleeve connector 7 to generate frictional damping. The spiral spline section 1B at the left end of the motor input spindle 1 rotates counterclockwise to push the entire counting and position damping shifting system to the left. After disengaging from the adsorption of the small magnetic ring 16 and disengaging from the two ratchet teeth, the two connectors automatically shift to a 1:1 direct drive output shaft 13, causing the drill bit to quickly retract. Then, the fast return button is released to stop.

[0061] During the above operation, the left end of the counting and positioning damping shifting sleeve 8 is always held in place by the inner spline sleeve on the outer spline of the spline sleeve coupling 12 without disengaging, and can move left and right. The power for its movement is provided by the right-hand spiral spline at the left end of the motor input spindle 1, which pushes and pulls the damping spiral guide sleeve coupling 7. When the damping spiral guide sleeve coupling 7 and the spline sleeve coupling 12 are engaged in a 1:1 forward rotation transmission, causing the drill bit to be obstructed from contacting the workpiece, the right-hand spiral spline at the left end of the motor input spindle 1 pulls the damping spiral guide sleeve coupling 7, disengaging the entire counting and positioning damping shifting system from the attraction of the large magnetic ring 15 and moving it to the right. At the same time, it disengages from both couplings, and under the attraction of the small magnetic ring 16, the ratchet at the right end of the counting and positioning damping shifting sleeve fully engages with the ratchet of the transmission disc. After the damping spiral guide sleeve coupling 7 disengages from the spline sleeve coupling 12, it rotates rapidly within the counting and positioning damping shifting sleeve at the same speed as the motor input spindle 1 without transmission, but the wear ring... The outer circle of 11 is secured to the inner circle of the counting and positioning damping shifting sleeve 8 by a steel ball with a diameter of 2mm. It does not rotate rapidly with the damping spiral guide sleeve connector 7. Under the pressure generated by the wave spring 9 pressing the hole retaining ring 10 against the bearing ring 11, the step of the damping spiral guide sleeve connector 7 and the step of the counting and positioning damping shifting sleeve 8 generate damping friction with each other. This is used to push the entire counting and positioning damping shifting system when the spiral spline section 1B reverses. At this time, the transmission ratio is 1:20. The transmission is transmitted from the transmission disc 4 to the output shaft 13 through the spline between the counting and positioning damping shifting sleeve 8 and the spline sleeve connector 12. When the motor input spindle 1 reverses, the damping spiral guide sleeve coupling 7 is in a no-transmission idling state relative to the counting and positioning damping shifting sleeve 8. At the same time, due to the attraction force of the small magnetic ring 16, the right-hand spiral spline of the spiral spline section 1B cannot push the entire counting and positioning damping shifting system to the left. At this time, the wave spring 9 and the wear ring 11 pressed by the retaining ring in the right end of the counting and positioning damping shifting sleeve 8 generate a certain damping between the counting and positioning damping shifting sleeve 8 and the damping spiral guide sleeve coupling 7. When the right-hand spiral spline of the spiral spline section 1B reverses to the left, the damping will push the entire counting and positioning damping shifting system to the left and engage the two couplings. At this time, it is a 1:1 reverse fast retraction drill bit. In the 1:1 state, the damping spiral guide sleeve coupling 7 and the counting and positioning damping shifting sleeve 8 rotate at the same speed without damping friction.

[0062] In one embodiment, if the automatic control mode is selected, it is necessary to set the stepper motor speed, drilling depth, and select a suitable sub-mode according to the drill bit diameter corresponding to the drilling depth. There are three sub-modes: drill bit diameter 10-25mm graded completion, drill bit diameter 26-40mm graded completion, and drill bit diameter ≥41mm one-time completion. Among them, drill bit diameter 10-25mm graded completion and drill bit diameter 26-40mm graded completion are unequal step retraction modes, and drill bit diameter ≥41mm one-time completion is a one-time completion mode without mid-process retraction.

[0063] If the selected sub-mode is to complete the drill bit diameter 10-25mm in stages, the working sequence is as follows: Press the start button, the program records the starting point, the motor rotates forward, the drill bit advances at a 1:1 ratio, when the drill bit quickly contacts the workpiece and is obstructed, the counting and position damping shifting sleeve 8 slides to the right, so that its ratchet meshes with the ratchet of the transmission disc 4 with a transmission ratio of 1:20. The outer circle of the counting and position damping shifting sleeve 8 has a central concave point 8-3 (counting groove). When the counting proximity switch 17 is aligned with its concave point, it sends an energizing signal to the PLC human-machine interface system, the program records the proximity point, and the drilling of the workpiece begins; the outer circle of the counting and position damping shifting sleeve 8 has 20 counting grooves on the left side for counting the magnetic induction counting of the proximity switch 18. When the drilling depth reaches 50mm, the motor stops for 1 second, then buffers and reverses, and automatically shifts gears. With the gear ratio set to 1:1, the counting and position damping shifting sleeve 8 slides to the left, aligning the right protrusion with the position proximity switch 17. At this time, the position proximity switch 17 sends a power-off signal to the PLC human-machine interface system. The first rapid retraction to remove chips occurs when the drill bit retracts to the near point (workpiece hole opening). After the motor stops, it starts rotating forward from 0 to the set speed value within 100 milliseconds using a buffer start method. At this time, under the attraction of the large magnetic ring 15, the counting and position damping shifting sleeve 8 continues at a 1:1 rapid advance to the bottom of the hole, where it is blocked. The shifting gear is then changed to 1:20 to drill 25mm deep. After the motor stops for 1 second, the buffer start reverses and automatically shifts back to 1:1 for the second rapid retraction to the near point to remove chips. The third drilling depth is 15mm deep, and each subsequent drilling depth is a maximum of 15mm deep until the last remainder is completed. The drill then retracts to the starting point and stops. If it is inconvenient to change the workpiece at this time, the tailstock can be moved away. When the tailstock is pulled back after changing the workpiece, there is no need for precise reset. Just lock the tailstock in the approximate position and you can start drilling the next workpiece.

[0064] Note: The drilling depth set by the user is counted from the moment the drill bit contacts the workpiece. The distance from the starting point recorded when the start button is pressed to the point where the drill bit contacts the workpiece is not included in the user-set drilling depth. That is, it can be long or short, but the depth distance after drilling is transferred and included in the multiple rapid advance and retraction distances. Therefore, the tailstock can be fixed and locked arbitrarily within the allowable range. However, the distance the tailstock slide tube is pre-extended before starting, the distance from the starting point recorded when the start button is pressed to the point where the drill bit contacts the workpiece is recorded, plus the drilling depth distance set by the user, must all be included within the limit positions at both ends of the tailstock slide tube; that is, within the total stroke range of the tailstock slide tube. This can be roughly determined by the user.

[0065] If the selected sub-mode is to complete the drill bit diameter 26-40 in stages, its working principle is the same as above, but the unequal step spacing becomes 80mm for the first time, 30mm for the second time, and a maximum of 20mm for each subsequent step until the last remaining step is completed and the machine quickly retreats to the starting point and stops.

[0066] If the selected sub-mode is "drill bit diameter ≥ 41, complete in one go", then the chip removal will not be performed midway, and the drill will quickly retract to the starting point and stop after drilling to the set depth in one go.

[0067] In standby mode, drilling parameters can be changed via the touchscreen.

[0068] Note: During the drilling process, the workpiece rotates; the rotational power is provided by the lathe, and the drill bit moves left and right; the power is provided by this CNC tailstock drill.

[0069] To further optimize the design and ensure operator safety and equipment protection, the rotational speed of this device is limited to 40-300 rpm. After the tailstock slide inserts the drill bit, the maximum travel distance of the tailstock slide remains 160mm. Therefore, the maximum drilling depth of this drill is set to 140mm to limit the safe travel range. During operation, if the tailstock slide reaches its limit position and causes the motor to stall, the counting proximity switch 18 will automatically determine a fault and immediately stop working if it fails to obtain a count within three seconds to ensure equipment safety. The stepper motor has a maximum torque of 12 Nm, which will not damage the cycloidal impeller reducer.

[0070] Since the stepper motor driver will continuously supply a locking current to the stepper motor in standby mode, causing the motor shaft to lock and prevent rotation, this invention uses a PLC program to replace the locking signal with an enable offline signal, which is continuously supplied to the stepper motor. This allows the stepper motor input spindle 1 and the handwheel 35 to be freely rotated by hand to adjust the position of the tailstock slide. In the power-off state, the handwheel can be rotated even without an enable signal.

[0071] The above description is merely a preferred embodiment of this utility model and is not intended to limit this utility model. Any minor modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of this utility model should be included within the protection scope of this utility model's technical solution.

Claims

1. A CNC tailstock drilling device, characterized in that, include: Stepper motor, cycloidal impeller reducer, counting and positioning damping shifting system, output shaft lead screw structure, data acquisition and feedback unit, PLC human-machine interface system, and drive power distribution system; among which... The left end face of the stepper motor stator (27) is connected to the transition flange (30) by a through bolt. After the bolt passes through the stator (27), it is connected to the rear end cover (31) of the motor on the right end face of the stator. The stepper motor input spindle (1) is fitted with bearing No. 1 (21), bearing No. 2 (22) and motor rotor (28) in the transition flange (30), the rear end cover (31) and the stator (27). The motor input spindle (1) contains an eccentric section (1A) with an eccentricity of 3mm and a spiral spline section (1B) in the cycloidal impeller reducer. A straight spline section (1C) and a smooth shaft section (1D) extend out of the rear end cover (31). A hand crank (35) is fitted on the extension section of the motor input spindle (1) near the rear end cover of the motor. The left section of the inner hole of the hand crank is a straight internal spline, and the right section of the inner hole is fitted with a copper sleeve (36). The inner hole of the copper sleeve is fitted on the outer circle of the optical shaft section (1D) of the motor input spindle. A return spring (34) is fitted on the outer circle of the straight spline section (1C) of the motor input spindle that extends out of the rear end cover (31) of the motor. There is a threaded hole at the center of the right end face of the optical shaft section (1D). The spindle end baffle (37) is fitted on the baffle screw (38) and tightened in the threaded hole at the center of the right end face of the optical shaft section (1D) to block the hand crank (35). The cycloidal impeller reducer consists of an transition flange (30), a 19-tooth fixed wheel (3), a 20-tooth cycloidal wheel (2), a transmission disc (4), a paving steel needle sleeve (5), a paving steel needle (6), bearing No. 3 (23), bearing No. 4 (24), a small magnetic ring (16), bearing No. 5 (25), and a main housing (29); the 19-tooth fixed wheel (3) is bolted to the outer circle of the boss on the left end face of the transition flange (30), and the 20-tooth cycloidal wheel (2) is mounted on the eccentric section (1A) of the motor input shaft through bearing No. 3 (23); the transmission disc ( 4) The No. 5 bearing (25) is installed in the main housing (29). The inner hole of the transmission disk (4) is fitted with the No. 4 bearing (24) and the small magnetic ring (16). The No. 4 bearing (24) is installed on the left side of the eccentric section of the motor input spindle. The end face of the transmission disk (4) is provided with a through hole. A pulsating steel needle (6) is inserted into each through hole. The pulsating steel needle has a 9mm extension section on the right end face of the transmission disk. A pulsating steel needle sleeve (5) is fitted on the outer circle of the pulsating steel needle in the extension section. The pulsating steel needle sleeve then extends into the pulsating hole opened on the end face of the 20-tooth cycloidal wheel (2). The counting and position damping shifting system includes a counting and position damping shifting slide sleeve (8), a damping spiral guide sleeve connector (7), a wear ring (11), a wave spring (9), a hole retaining ring (10), and a spline sleeve connector (12). The damping spiral guide sleeve connector (7) is fitted inside the right side of the counting and position damping shifting slide sleeve (8), and a wear ring (11) is fitted on the outer circle of the right side of the damping spiral guide sleeve connector (7). A circular bottom groove (11-1) is opened on the outer circle of the wear ring (11), and the circular bottom groove (11-1) corresponds to the anti-rotation fixing steel ball indentation (8-1) inside the counting and position damping shifting slide sleeve (8). A steel ball is provided in the fixed steel ball concave point (8-1) to hold the round bottom groove (11-1) on the outer circle of the wear ring (11) so that the wear ring (11) cannot rotate in the counting and position damping shifting slide sleeve (8). The outer circle of the damping spiral guide sleeve connector (7) on the right end face of the wear ring (11) is fitted with a wave spring (9) and a hole retaining ring (10). The inner spline of the left side of the counting and position damping shifting slide sleeve (8) is fitted on the outer spline of the spline sleeve connector (12) and can slide a distance of 7mm. The right-hand spiral inner spline of the damping spiral guide sleeve connector (7) is fitted on the outside of the spiral spline section (1B) of the motor input spindle (1). The spline sleeve connector (12) is fitted inside the spline sleeve on the right side of the output shaft spline (13A) of the output shaft (13) of the output shaft screw structure; a groove is provided on the outer circle of the output shaft spline (13A) near the end, and a wire retainer (14) is inserted into it to hold the spline sleeve connector (12) in the position of the output shaft spline (13A); a large magnetic ring (15) is fitted on the outer circle of the left end of the spline sleeve connector (12); the counter damping shifting slide sleeve (8) and the transmission disc (4) are connected by a ratchet that can be separated and engaged. The data acquisition feedback unit includes a position proximity switch (17) and a counting proximity switch (18). The two proximity switches are installed in the position mounting hole (29-1) and the counting mounting hole (29-2) in the proximity switch mounting chamber (29-4) respectively through the slot hole (29-3) and the thread. The position proximity switch (17) is used to determine the position of the counting damping shift sleeve (8), and the counting proximity switch (18) is used to determine the number of rotations of the counting damping shift sleeve (8). The position proximity switch (17) and the counting proximity switch (18) are electrically connected to the PLC human-machine interaction system. The PLC human-machine interface system consists of a control box (e), a control button unit (f), and a PLC human-machine interface integrated machine (g). The control button unit (f) and the PLC human-machine interface integrated machine are equipped with indicator lights (h). The control button unit is encapsulated within the control box, and the human-machine interface integrated machine is located on one side of the control box. The power supply and control of the drive power distribution system and the PLC human-machine interface system are electrically connected via a main cable conduit (32A). The data acquisition feedback unit and the PLC human-machine interface system are electrically connected via a feedback cable conduit (32B). The control box is fixedly connected below the stepper motor. The drive power distribution system includes a distribution box, a three-wire power input plug, a power switch, a leakage current protection device, a 24V DC switching power supply, a stepper motor driver, and a main cable conduit. The distribution box is connected to the PLC human-machine interface system and the stepper motor via cables.

2. The CNC tailstock drilling device according to claim 1, characterized in that, The main housing (29) is the outer shell of the cycloidal impeller reducer. The main housing (29) is fitted on the outside of the cycloidal impeller reducer. The main housing (29) is provided with a position mounting hole (29-1), a counting mounting hole (29-2), a slotted hole (29-3), a proximity switch mounting chamber (29-4), a slotted assembly countersunk hole (a), an oil inlet (b), and an oil level observation window (c). After the position proximity switch (17) and the counting proximity switch (18) are installed, the slotted hole (29-3) is blocked with a plug (33).

3. The CNC tailstock drilling device according to claim 1, characterized in that, The output shaft screw structure includes an output shaft (13), a No. 6 bearing (26), a copper washer (20), and a lock nut (19). The end of the output shaft (13) with the No. 6 bearing (26) fitted on its outer circle is inserted into the stepped hole on the left end face of the main housing (29). The section of the output shaft extending to the right of the stepped hole consists of a threaded section and a splined section. The threaded section close to the right side of the stepped hole is fitted with a copper washer (20). The right end face of the copper washer has a lock nut (19) that is screwed onto the positioning step of the output shaft (13).

4. The CNC tailstock drilling device according to claim 1, characterized in that, There are 6 through holes, which are evenly spaced on the transmission disc (4). The diameter of the through holes is 6mm. The outer diameter of the actuating steel needle sleeve is 10mm. The diameter of the actuating hole on the end face of the 20-tooth cycloidal wheel (2) is 13mm.

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