Machine tool spindle core rod driving and feeding device

Abstract

A machine tool spindle core rod driving and feeding device belongs to the field of mechanical transmission and comprises a micro driving unit, a feeding mechanism, a cooling air rotary distributor, a lubricating oil rotary distributor, a transmission core rod assembly and a support mounting unit. The micro driving unit is connected with an external flange of the feeding mechanism, and the micro driving unit is matched with the feeding mechanism; the feeding mechanism is connected with the cooling air rotary distributor; the feeding mechanism is in accurate positioning connection with the bracket mounting unit; the cooling air rotary distributor is hermetically connected with the lubricating oil rotary distributor; the cooling air rotary distributor bracket is matched with the mounting unit; the lubricating oil rotary distributor is connected with the transmission core rod assembly in a sealing manner; the lubricating oil rotary distributor is connected with the transmission core rod assembly in a sealing manner; and the lubricating oil rotary distributor is matched with the bracket mounting unit. According to the device, the strength and rigidity of the supporting part of the transmission lead screw are effectively improved, the problem that cooling air and lubricating oil circulate reliably inside is solved, and cooling and internal lubrication of the composite tool are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical transmission, and relates to a linear feeding device, in particular to a machine tool spindle core rod driven feeding device. Background Art

[0002] As we all know, in mechanical processing, the machine tool spindle is an important component that drives the workpiece or tool to rotate, transmitting motion and torque. Special boring heads, expansion honing heads, etc. are used as spindle connection components for compound cutting and honing, and their functions need to be realized through the spindle. The spindle core rod telescopic drive feed mechanism is based on the functions of tool telescopic feed, honing expansion, mist cooling, internal lubrication, etc. and relies on the spindle inner hole. However, due to the different external dimensions and load requirements of the machine tool spindle, its inner hole size is relatively small, and a small transmission feed drive mechanism constructed with a micro screw is required. This also brings difficulties to the design of the machine tool spindle core rod telescopic feed device.

[0003] As an important transmission component in mechanical transmission, the transmission screw plays an important role in mechanical processing. The transmission screw converts rotational motion into linear motion, or converts torque into axial repetitive force.

[0004] Conventional drive screws in the prior art often utilize a direct connection between the optical axis and bearing assembly at each end of the screw, driven by an external bearing seat and coupling. This achieves high transmission accuracy and rigidity, meeting transmission requirements for fast response, low friction, and high efficiency. Drive feed mechanisms often utilize a direct connection between a ball screw nut and a motion unit nut holder for linear reciprocating motion. However, the small dimensions of the drive screw present certain difficulties in designing the support connection and arranging the drive feed structure. Furthermore, the miniaturization of the support bearing significantly impacts the rigidity and transmission accuracy of the overall structure. Conventional support connections struggle to address the structural rigidity and high precision of the drive screw, significantly impacting its service life and causing issues such as support bearing failure and loss of drive feed motion accuracy. Furthermore, conventional nut and nut holder connections cannot be designed and arranged within small drive feed mechanisms, preventing efficient and reliable transmission of motion and torque. Some drive screws employ a direct integrated support connection and screw drive structure, complicating the drive screw structure and increasing manufacturing, maintenance, and replacement costs.

[0005] The transmission rods of the spindle core drive feed device not only undertake precise reciprocating motion, but also undertake the dual functions of linear movement and rotation. At the same time, it is necessary to introduce cooling air and lubricating oil into the tool cooling and lubrication parts. The design and layout of its structure have a great impact on the stability of the entire drive mechanism.

[0006] For the above reasons, it is completely necessary to provide a machine tool spindle core rod driving feeding device which is compact in structure, reasonable in layout and high in reliability. SUMMARY

[0007] The purpose of the present application is to provide a machine tool spindle core rod driving feeding device which is compact in structure, reasonable in layout and high in reliability. To solve the structure rigidity, transmission strength, lubrication cooling and high precision of the transmission screw connection driving inside the machine tool spindle core rod telescopic feeding mechanism, and to meet the cutting tool feeding function requirements.

[0008] To achieve the above purpose, the technical scheme adopted by the present application is: a machine tool spindle core rod driving feeding device, comprising: a micro driving unit, a feeding mechanism, a cooling air rotary distributor, a lubricating oil rotary distributor, a transmission core rod assembly, a bracket mounting unit; the micro driving unit is flange connected with the outside of the feeding mechanism through four bolts, and the motor transmission shaft inside the micro driving unit is matched with the support connecting shaft in the feeding mechanism through a motor transmission pin; the nut seat in the feeding mechanism is threadedly fastened with the cooling air rotary distributor main body in the cooling air rotary distributor through the matching hole of the feeding mechanism main seat; the feeding mechanism main seat outside the feeding mechanism is precisely positioned with the feeding mechanism mounting seat in the bracket mounting unit through the first positioning key and the second positioning key, and then is fastened and connected through bolts; the cooling air rotary distributor rotating shaft in the cooling air rotary distributor is sealingly connected with the lubricating oil rotary distributor rotating shaft in the lubricating oil rotary distributor through internal and external threads; the air inlet connector in the cooling air rotary distributor is matched with the cooling air rotary distributor limiting rotation bracket in the bracket mounting unit; the rotating shaft in the lubricating oil rotary distributor is sealingly and sealingly connected with the transmission core rod inner rod in the transmission core rod assembly through the lubricating oil rotary distributor rotating shaft sealing insertion, and the rotating shaft in the lubricating oil rotary distributor is sealingly connected with the transmission core rod outer rod in the transmission core rod assembly through the transmission core rod connecting sealing thread; the first lubricating oil connector in the lubricating oil rotary distributor is installed in cooperation with the lubricating oil rotary distributor limiting rotation bracket in the bracket mounting unit.

[0009] The micro driving unit comprises: a motor transmission pin, a motor transmission shaft, a positioning stop, a first connecting flange, and a micro motor main body; the motor transmission pin is installed in cooperation with the mounting hole on the motor transmission shaft, the positioning stop is positioned in cooperation with the motor stop hole on the flange bearing seat, and the first connecting flange is connected with the motor connecting thread hole of the flange bearing seat through a bolt; the micro motor main body, the first connecting flange, the positioning stop, the motor transmission shaft and the motor transmission pin are sequentially installed from outside to inside.

[0010] The feeding mechanism comprises: a flange bearing seat, a support connecting shaft, a feeding mechanism main body seat, a bearing positioning locking nut, a nut positioning locking nut, a transmission key, a transmission screw, a guide key, a nut seat, a detection switch assembly, a limiting sleeve, a screw supporting bearing group, a stop top screw, a pre-tightening nut, a support guide belt, a first positioning key, and a second positioning key; the transmission screw is installed in cooperation with the support connecting shaft hole, and the transmission screw is pressed by the two stop top screws; the screw supporting bearing group is connected with the support connecting shaft bearing in cooperation, and the bearing is pre-tightened and positioned by screwing the pre-tightening nut on the support connecting shaft; the installation assembly of the transmission screw, the support connecting shaft, the screw supporting bearing group, and the pre-tightening nut is installed in cooperation with the inner hole of the flange bearing seat, and the outer ring of the screw supporting bearing group is pressed and limited by screwing the bearing positioning locking nut into the flange bearing seat; the limiting sleeve is a circular ring sleeve, and the limiting sleeve is connected with the limiting sleeve cooperation surface of the support connecting shaft, and is axially positioned by the support connecting shaft; the inner ring of the limiting sleeve safely limits both ends of the motor transmission shaft; the nut of the transmission screw is installed in cooperation with the nut seat through the transmission key, and is axially positioned and locked by the nut positioning locking nut; two groups of support guide belts are installed in the guide groove of the outer circle of the nut seat, and the combination of the flange bearing seat, the support connecting shaft, the transmission screw, the screw supporting bearing group, and the nut seat is installed in cooperation with the inner hole of the feeding mechanism main body seat, and is fastened and connected through the flange connecting hole of the flange bearing seat; the guide key is positioned and installed with the nut seat through the key groove, the protruding part of the guide key cooperates with the guide groove of the feeding mechanism main body seat, and the detection switch assembly is installed in cooperation with the guide groove installation hole of the feeding mechanism main body seat.

[0011] The cooling air rotary distributor comprises: an air inlet joint, a cooling air rotary distributor main body, a rotary shaft bearing group, a rotary shaft positioning nut, a cooling air rotary distributor rotary shaft, a rotary shaft pre-tightening nut, and a rotary shaft connecting sealing ring; the air inlet joint is threadedly connected with the air inlet hole on the cooling air rotary distributor main body; the cooling air rotary distributor rotary shaft is installed in cooperation with the rotary shaft bearing group, and after the bearing is pre-tightened by the rotary shaft pre-tightening nut, the combination of the cooling air rotary distributor rotary shaft, the rotary shaft bearing group, and the rotary shaft pre-tightening nut is installed in cooperation with the installation hole of the cooling air rotary distributor main body, and is positioned and installed by the rotary shaft positioning nut; the rotary shaft connecting sealing ring is installed in cooperation with the sealing groove of the thread connection part of the cooling air rotary distributor rotary shaft.

[0012] The lubricating oil rotary distributor comprises a first lubricating oil joint, a second lubricating oil joint, a lubricating oil rotary distributor rotating shaft, a limiting top screw, a third lubricating oil joint, a lubricating oil rotary distributor shell, and a lubricating oil rotary distributor rotating shaft seal; the first lubricating oil joint, the second lubricating oil joint, and the third lubricating oil joint are respectively connected with three lubricating holes on the circumference of the lubricating oil rotary distributor shell through screw thread cooperation; the lubricating oil rotary distributor rotating shaft is matched with the hole in the lubricating oil rotary distributor shell, and is axially positioned and locked through two limiting top screws; the lubricating oil rotary distributor rotating shaft seal is matched and installed with the sealing groove of the inner hole of the lubricating oil rotary distributor rotating shaft output end.

[0013] The transmission core rod assembly comprises a transmission core rod connecting seal, a transmission core rod inner rod, and a transmission core rod outer rod; the transmission core rod connecting seal is matched and installed with the internal thread sealing groove of the transmission core rod outer rod, and the transmission core rod inner rod is nested with the transmission core rod outer rod.

[0014] The support mounting unit comprises a feeding mechanism mounting seat, a backing plate, a machine tool body, a feeding mechanism mounting seat coarse positioning pin, a feeding mechanism mounting seat adjusting pad, a cooling air rotary distributor rotation limiting seat 6.6, a cooling air rotary distributor rotation limiting support, a lubricating oil rotary distributor rotation limiting seat, and a lubricating oil rotary distributor rotation limiting support; the feeding mechanism mounting seat is positioned with the backing plate and the machine tool body 6.3 through the feeding mechanism mounting seat coarse positioning pin and is connected through a bolt; the feeding mechanism mounting seat adjusting pad is connected with the feeding mechanism mounting seat and the machine tool body through a bolt; the cooling air rotary distributor rotation limiting seat and the cooling air rotary distributor rotation limiting support are connected with the machine tool body through a bolt; the lubricating oil rotary distributor rotation limiting seat and the lubricating oil rotary distributor rotation limiting support are connected with the machine tool body through a bolt.

[0015] The transmission screw rod comprises a screw rod and a nut; a spherical stop positioning groove and a third positioning key are arranged on the front light rod connecting part of the screw rod.

[0016] The nut seat comprises an output shaft, a nut seat body, and a nut seat positioning key groove; the output shaft and the nut seat body are of an integral structure, and two guide grooves are arranged on the outer circle of the nut seat body; a nut mounting hole, a nut positioning key, and a threaded hole are sequentially arranged inside.

[0017] The flange bearing seat comprises a locking nut threaded hole, a bearing mounting positioning hole, an outer mounting surface, a driving connection hole cavity, a second connecting flange, a motor stop hole, a flange connection hole, and a motor connection threaded hole; the inside of the flange bearing seat is sequentially provided with the locking nut threaded hole, the bearing mounting positioning hole, and the driving connection hole cavity; four flange connection holes and four motor connection threaded holes are arranged on the second connecting flange of the flange bearing seat, a motor stop hole is arranged on the back surface of the second connecting flange, and the outer mounting surface and the second connecting flange are integrated.

[0018] The application has the advantages that the application has compact structure, reasonable layout and high reliability, has great advantages compared with the traditional driving connection mode of the direct connection of the transmission screw rod with the bearing and the shaft coupling, effectively improves the strength and rigidity of the transmission screw rod supporting part, solves the internal reliable circulation of the cooling air and the lubricating oil, ensures the cooling and internal lubrication of the boring head composite cutter, the connection mode of the driving motor and the transmission part is convenient and reliable, improves the convenience of installation and disassembly, is suitable for the driving connection and installation of the transmission screw rod device, and plays a very important role in the transmission high precision, high rigidity and high efficiency of the transmission screw rod, greatly improves the service life of the transmission screw rod transmission device. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the machine tool spindle core rod driving feeding device of the application; Figure 2 It is a whole structure sectional view of the machine tool spindle core rod driving feeding device; Figure 3 It is a main body three-dimensional schematic view of the machine tool spindle core rod driving feeding device; Figure 4 It is a local three-dimensional schematic view of the machine tool spindle core rod driving feeding device; Figure 5 It is a driving part three-dimensional schematic view of the machine tool spindle core rod driving feeding device; Figure 6 It is a structure sectional view of the feeding mechanism of the machine tool spindle core rod driving feeding device; Figure 7 It is a structural schematic view of the flange bearing seat of the machine tool spindle core rod driving feeding device; Figure 8 It is a structure schematic view of the screw nut seat of the machine tool spindle core rod driving feeding device.

[0020] In the figure: 1. Miniature drive unit, 2. Feeding mechanism, 3. Cooling air rotary distributor, 4. Lubricating oil rotary distributor, 5. Transfer core rod assembly, 6. Bracket mounting unit; 1.1. Motor drive pin, 1.2. Motor drive shaft, 1.3. Positioning stop, 1.4. First connecting flange, 1.5. Miniature motor main body; 2.1. Flange bearing seat, 2.2. Support connecting shaft, 2.3. Feeding mechanism main body seat, 2.4. Bearing positioning locking nut, 2.5. Screw nut positioning locking nut, 2.6. Transmission key, 2.7. Transmission screw, 2.8. Guide key, 2.9. Screw nut seat, 2.10. Detection switch, 2.11. Limiting sleeve, 2.12. Screw rod support bearing set, 2.13. Stop top screw, 2.14. Pre-tightening nut, 2.15. Support guide belt, 2.16. First positioning key, 2.17. Second positioning key; 3.1. Air inlet connector, 3.2. Cooling air rotary distributor main body, 3.3. Rotary shaft bearing set, 3.4. Rotary shaft positioning nut, 3.5. Cooling air rotary distributor rotary shaft, 3.6. Rotary shaft pre-tightening nut, 3.7. Rotary shaft connecting sealing ring; 4.1. First lubricating oil connector, 4.2. Second lubricating oil connector, 4.3. Rotary shaft, 4.4. Limiting top screw, 4.5. Third lubricating oil connector, 4.6. Lubricating oil rotary distributor housing, 4.7. Lubricating oil rotary distributor rotary shaft sealing; 5.1. Transfer core rod connecting sealing, 5.2. Transfer core rod inner rod, 5.3. Transfer core rod outer rod; 6.1. Feeding mechanism mounting seat, 6.2. Pad, 6.3. Machine tool main body, 6.4. Feeding mechanism mounting seat coarse positioning pin, 6.5. Feeding mechanism mounting seat adjustment pad, 6.6. Cooling air rotary distributor limiting rotation seat, 6.7. Cooling air rotary distributor limiting rotation bracket, 6.8. Lubricating oil rotary distributor limiting rotation seat, 6.9. Lubricating oil rotary distributor limiting rotation bracket; 2.1.1. Locking nut threaded hole, 2.1.2. Bearing installation positioning hole, 2.1.3. Outer mounting surface, 2.1.4. Drive connecting cavity, 2.1.5. Second connecting flange, 2.1.6. Motor stop hole, 2.1.7. Flange connecting hole, 2.1.8. Motor connecting threaded hole; 2.7.1. Screw rod, 2.7.2. Screw nut, 2.7.3. Spherical stop positioning groove, 2.7.4. Third positioning key, 2.7.5. Transmission key groove; 2.9.1. Output shaft, 2.9.2. Screw nut seat main body, 2.9.3. Screw nut seat positioning key groove, 2.9.4. Guide belt groove, 2.9.5. Screw nut mounting hole, 2.9.6. Screw nut positioning key groove, 2.9.7. Threaded hole. DETAILED DESCRIPTION

[0021] The present application will be described in detail below with reference to the drawings and embodiments, but it should be understood that the scope of protection of the present application is not limited by the specific embodiments.

[0022] As Figure 1-8 A machine tool spindle core rod driving feeding device is shown, comprising: a micro drive unit 1, a feeding mechanism 2, a cooling air rotary distributor 3, a lubricating oil rotary distributor 4, a transmission core rod assembly 5, a bracket mounting unit 6.

[0023] In this embodiment, the micro drive unit 1 is positioned outside the feeding mechanism 2 by positioning stop 1.3, and is flange connected by four bolts. The motor drive shaft 1.2 inside the micro drive unit 1 is matched with the support connecting shaft 2.2 of the feeding mechanism 2 through the motor drive pin 1.1, realizing the gapless transmission of the transmission pin and the pin groove. The output shaft 2.9.1 of the nut seat 2.9 of the feeding mechanism 2 is threadedly fastened with the cooling air rotary distributor body 3.2 of the cooling air rotary distributor 3 through the matching hole of the feeding mechanism body seat 2.3, realizing the accurate linear displacement distance. The feeding mechanism body seat 2.3 outside the feeding mechanism 2 is precisely positioned with the feeding mechanism mounting seat 6.1 of the bracket mounting unit 6 through the first positioning key 2.16 and the second positioning key 2.17, and is then fastened by bolts. The cooling air rotary distributor rotating shaft 3.5 of the cooling air rotary distributor 3 is sealingly connected with the lubricating oil rotary distributor rotating shaft 4.3 of the lubricating oil rotary distributor 4 through internal and external threads, realizing the internal safe circulation of cooling air. The air inlet connector 3.1 of the cooling air rotary distributor 3 is matched with the cooling air rotary distributor rotation limiting bracket 6.7 of the bracket mounting unit 6, which can limit the rotation of the cooling air rotary distributor body 3.2. The rotating shaft 4.3 of the lubricating oil rotary distributor 4 is sealingly connected with the transmission core rod inner rod 5.2 of the transmission core rod assembly 5 through the lubricating oil rotary distributor rotating shaft sealing 4.7, and the rotating shaft 4.3 of the lubricating oil rotary distributor 4 is threadedly sealingly connected with the transmission core rod outer rod 5.3 of the transmission core rod assembly 5 through the transmission core rod connecting sealing 5.1, ensuring the reliable circulation of internal lubricating oil channels and cooling air. The first lubricating oil connector 4.1 of the lubricating oil rotary distributor 4 is matched with the lubricating oil rotary distributor rotation limiting bracket 6.9 of the bracket mounting unit 6, which can limit the rotation of the lubricating oil rotary distributor housing 4.6, and meet the reliable supply of cooling air and lubricating oil during spindle rotation.

[0024] The micro drive unit 1 comprises a motor drive pin 1.1, a motor drive shaft 1.2, a positioning stop 1.3, a first connecting flange 1.4, and a micro motor body 1.5. During installation, the motor drive pin 1.1 is installed in cooperation with the installation hole on the motor drive shaft 1.2, in a cross shape, which can improve the connection and transmission reliability through a transition fit form, the combination is inserted into the motor drive shaft drive clamping groove of the supporting connecting shaft 2.2 to form a matched transmission, the positioning stop 1.3 is matched and positioned with the motor stop hole 2.1.6 on the flange bearing seat 2.1, and the first connecting flange 1.4 is connected with the motor connecting thread hole 2.1.8 of the flange bearing seat 2.1 through a bolt. The micro motor body 1.5, the first connecting flange 1.4, the positioning stop 1.3, the motor drive shaft 1.2, and the motor drive pin 1.1 are arranged and installed from outside to inside.

[0025] The feeding mechanism 2 comprises: a flange bearing seat 2.1, a support connecting shaft 2.2, a feeding mechanism main body seat 2.3, a bearing positioning locking nut 2.4, a nut positioning locking nut 2.5, a transmission key 2.6, a transmission screw rod 2.7, a guide key 2.8, a nut seat 2.9, a detection switch assembly 2.10, a limiting sleeve 2.11, a screw rod supporting bearing group 2.12, a stop top screw 2.13, a pre-tightening nut 2.14, a support guide belt 2.15, a first positioning key 2.16, and a second positioning key 2.17. The transmission screw rod 2.7 is installed in cooperation with the hole of the support connecting shaft 2.2, and the transmission screw rod 2.7 is pressed tightly by the two stop top screws 2.13. The screw rod supporting bearing group 2.12 is connected with the support connecting shaft 2.2 in cooperation with the bearing, and the pre-tightening nut 2.14 is screwed with the support connecting shaft 2.2 to pre-tighten and position the bearing. The installation assembly of the transmission screw rod 2.7, the support connecting shaft 2.2, the screw rod supporting bearing group 2.12, and the pre-tightening nut 2.14 is installed in cooperation with the inner hole of the flange bearing seat 2.1, and the bearing positioning locking nut 2.4 is screwed into the flange bearing seat 2.1 to press and limit the outer ring of the screw rod supporting bearing group 2.12. The limiting sleeve 2.11 is a circular ring sleeve, and the limiting sleeve 2.11 is connected with the end limiting sleeve of the support connecting shaft 2.2 in cooperation with the limiting sleeve, and the support connecting shaft 2.2 is axially positioned. The inner ring of the limiting sleeve 2.11 safely limits the two ends of the motor transmission shaft 1.2, ensures that the motor transmission pin 1.1 is safely in the motor transmission shaft driving slot, and rotates and drives safely and stably with the driving unit. The nut of the transmission screw rod 2.7 is installed in cooperation with the nut seat 2.9 through the transmission key 2.6, and the nut is axially positioned and locked by the nut positioning locking nut 2.5. Two groups of support guide belts 2.15 are installed in the guide grooves of the outer circle of the nut seat 2.9. The assembly of the flange bearing seat 2.1, the support connecting shaft 2.2, the transmission screw rod 2.7, the screw rod supporting bearing group 2.12, and the nut seat 2.9 is installed in cooperation with the inner hole of the feeding mechanism main body seat 2.3, and is fastened and connected through the flange connecting hole of the flange bearing seat 2.1. The guide key 2.8 is positioned and installed with the nut seat 2.9 through the key groove, the protruding part of the guide key 2.8 cooperates with the guide groove of the feeding mechanism main body seat 2.3, and the detection switch assembly 2.10 is installed in cooperation with the guide groove installation hole of the feeding mechanism main body seat 2.3.

[0026] The cooling air rotary distributor 3 comprises: an air inlet joint 3.1, a cooling air rotary distributor body 3.2, a rotary shaft bearing set 3.3, a rotary shaft positioning nut 3.4, a cooling air rotary distributor rotary shaft 3.5, a rotary shaft pre-tightening nut 3.6, and a rotary shaft connecting sealing ring 3.7; the air inlet joint 3.1 is threadedly connected with an air inlet hole on the cooling air rotary distributor body 3.2; the cooling air rotary distributor rotary shaft 3.5 is installed in cooperation with the rotary shaft bearing set 3.3, and after bearing pre-tightening by the rotary shaft pre-tightening nut 3.6, the combination of the cooling air rotary distributor rotary shaft 3.5, the rotary shaft bearing set 3.3, and the rotary shaft pre-tightening nut 3.6 is installed in cooperation with a mounting hole of the cooling air rotary distributor body 3.2, and positioning installation is performed by the rotary shaft positioning nut 3.4; the rotary shaft connecting sealing ring 3.7 is installed in cooperation with a sealing groove at a threaded connection part of the cooling air rotary distributor rotary shaft 3.5.

[0027] The lubricating oil rotary distributor 4 comprises: a first lubricating oil joint 4.1, a second lubricating oil joint 4.2, a rotary shaft 4.3, a limiting top screw 4.4, a third lubricating oil joint 4.5, a lubricating oil rotary distributor shell 4.6, and a lubricating oil rotary distributor rotary shaft seal 4.7; the first lubricating oil joint 4.1, the second lubricating oil joint 4.2, and the third lubricating oil joint 4.5 are threadedly connected with three lubricating holes on the circumference of the lubricating oil rotary distributor shell 4.6; the rotary shaft 4.3 is fitted in a hole in the lubricating oil rotary distributor shell 4.6, and is axially positioned and locked by two limiting top screws 4.4; and the lubricating oil rotary distributor rotary shaft seal 4.7 is in a sealing groove in an inner hole of an output end of the rotary shaft 4.3.

[0028] The transmission core rod assembly 5 comprises: a transmission core rod connecting sealing ring 5.1, a transmission core rod inner rod 5.2, and a transmission core rod outer rod 5.3; the transmission core rod connecting sealing ring 5.1 is installed in cooperation with an internal thread sealing groove of the transmission core rod outer rod 5.3, and the transmission core rod inner rod 5.2 is installed in a nested manner with the transmission core rod outer rod 5.3.

[0029] The support mounting unit 6 includes: a feeding mechanism mounting seat 6.1, a backing plate 6.2, a machine tool body 6.3, a feeding mechanism mounting seat coarse positioning pin 6.4, a feeding mechanism mounting seat adjusting pad 6.5, a cooling air rotary distributor limiting seat 6.6, a cooling air rotary distributor limiting support 6.7, a lubricating oil rotary distributor limiting seat 6.8, and a lubricating oil rotary distributor limiting support 6.9. The feeding mechanism mounting seat 6.1 is positioned with the backing plate 6.2 and the machine tool body 6.3 through the feeding mechanism mounting seat coarse positioning pin 6.4 and is connected through bolts. The feeding mechanism mounting seat adjusting pad 6.5 is connected with the feeding mechanism mounting seat 6.1 and the machine tool body 6.3 through bolts. The cooling air rotary distributor limiting seat 6.6 and the cooling air rotary distributor limiting support 6.7 are both connected through bolts. The lubricating oil rotary distributor limiting seat 6.8 and the lubricating oil rotary distributor limiting support 6.9 are both connected through bolts. The air inlet connector 3.1 enables the cooling air rotary distributor body 3.2 to only move up and down and not rotate under the limitation of the cooling air rotary distributor limiting seat 6.6. The third lubricating oil connector 4.5 enables the lubricating oil rotary distributor shell 4.6 to only move up and down and not rotate under the limitation of the lubricating oil rotary distributor limiting support 6.9.

[0030] In the embodiment, the transmission screw rod 2.7 is a standard ordinary transmission screw rod, including a screw rod 2.7.1 and a nut 2.7.2. A ball-type stop positioning groove 2.7.3 and a third positioning key 2.7.4 are arranged on the front light pole connecting part of the screw rod 2.7.1. A transmission key groove 2.7.5 is arranged on the nut 2.7.2. The light pole connecting part of the screw rod 2.7.1 of the transmission screw rod 2.7 is inserted into the transmission screw rod connecting hole of the support connecting shaft 2.2. The third positioning key 2.7.4 at the top end of the light pole connecting part of the screw rod 2.7.1 is in positioning cooperation with the key groove inside the support connecting shaft 2.2. The light pole connecting part of the screw rod 2.7.1 and the transmission screw rod connecting hole of the support connecting shaft 2.2 adopt a transition fit, which improves the reliability of the transmission connection and ensures the coaxial accuracy requirement after the connection. After the connection is completed, the two stop jack screws 2.13 in the transmission screw rod stop screw hole 2.1.2 of the support connecting shaft 2.2 are in positioning cooperation with the ball-type stop positioning groove 2.7.3. The stop jack screws or jack screw thread glue can be used for anti-loosening treatment. The transmission screw rod 2.7 is axially limited with high reliability, so that the transmission screw rod 2.7 and the support connecting shaft 2.2 form a special support form combined body special transmission screw rod component.

[0031] The screw rod support bearing set 2.12 is connected with the outer bearing mounting part of the support connecting shaft 2.2, the inner ring of the screw rod support bearing set 2.12 is positioned by the shaft shoulder of the support connecting shaft 2.2 on one side in the axial direction, and the other side is locked by the end locking nut of the support connecting shaft 2.2 through the pre-tightening of the nut 2.14; the mounting combination transmission member of the transmission screw rod 2.7, the support connecting shaft 2.2 and the screw rod support bearing set 2.12 is connected with the bearing mounting positioning hole 2.1.2 of the flange bearing seat 2.1, and the bearing positioning locking nut 2.4 is screwed into the locking nut threaded hole 2.1.1 of the flange bearing seat 2.1 to press and position the outer ring of the screw rod support bearing set 2.12, so that the mounting combination transmission member of the transmission screw rod 2.7, the support connecting shaft 2.2 and the screw rod support bearing set 2.12 and the flange bearing seat 2.1 form a high-rigidity precision transmission part.

[0032] In the embodiment, the flange bearing seat 2.1 includes a locking nut threaded hole 2.1.1, a bearing mounting positioning hole 2.1.2, an outer mounting surface 2.1.3, a driving connecting hole cavity 2.1.4, a second connecting flange 2.1.5, a motor stop hole 2.1.6, a flange connecting hole 2.1.7 and a motor connecting threaded hole 2.1.8; the second connecting flange 2.1.5 of the flange bearing seat 2.1 is square, and is provided with four flange connecting holes 2.1.7 and four motor connecting threaded holes 2.1.8; the back surface of the second connecting flange 2.1.5 is provided with the motor stop hole 2.1.6, and the outer mounting surface 2.1.3 is integrated with the second connecting flange 2.1.5. The second connecting flange 2.1.5 of the flange bearing seat 2.1 is not limited to be square, and the outer mounting surface 2.1.3 of the flange bearing seat 2.1 is not limited to be a cylindrical surface, and the positions and numbers of the motor connecting threaded holes 2.1.8 and the flange connecting holes 2.1.7 provided thereon are not limited to the above, and are mainly set according to the structures of the used devices; the bearing mounting positioning hole 2.1.2, the locking nut threaded hole 2.1.1, the driving connecting cavity 2.1.4 and the motor stop hole 2.1.6 are provided inside according to the shape and size requirements of the support connecting member.

[0033] In the embodiment, the nut seat 2.9 comprises an output shaft 2.9.1, a nut seat body 2.9.2, a nut seat positioning key groove 2.9.3, the output shaft 2.9.1 and the nut seat body 2.9.2 are in integral structure, the nut seat body 2.9.2 has two guide belt grooves 2.9.4 on the outer circle, and the inside is sequentially provided with a nut mounting hole 2.9.5, a nut positioning key groove 2.9.6 and a threaded hole 2.9.7. After the nut 2.7.2 of the transmission screw rod 2.7 and the transmission key 2.6 are cooperatively installed through the transmission key groove 2.7.5, they are inserted into the nut positioning key groove 2.9.6 of the nut seat 2.9, and the axial positioning locking is performed through the nut positioning locking nut 2.5. Two groups of support guide belts 2.15 are installed in the guide grooves of the outer circle of the nut seat 2.9, the flange bearing seat 2.1, the support connecting shaft 2.2, the transmission screw rod 2.7, the screw rod support bearing group 2.12 and the combination of the nut seat 2.9 are cooperatively installed in the inner hole of the feeding mechanism body seat 2.3, and the fastening connection is performed through the flange connecting hole 2.1.7 of the flange bearing seat 2.1. The guide key 2.8 is positioned and installed with the nut seat positioning key groove 2.9.3 of the nut seat 2.9, the protruding part of the guide key 2.8 cooperates with the guide groove of the feeding mechanism body seat 2.3, the detection switch assembly 2.10 cooperatively installs with the guide groove installation hole of the feeding mechanism body seat 2.3, and the rotation of the nut seat 2.9 is limited. The combination of the nut 2.7.2 of the transmission screw rod 2.7 and the nut seat 2.9 cooperatively slides in the inner hole of the feeding mechanism body seat 2.3 under the cooperation of the two groups of support guide belts 2.15. The detection switch assembly 2.10 detects and confirms the in-situ signal through the boss of the guide key 2.8, and realizes the bidirectional driving of the feeding mechanism.

[0034] When the main shaft core rod driving feeding works, the micro driving unit 1 converts the command pulse into the transmission torque of the support connecting shaft 2.2 in the feeding mechanism 2 through the motor transmission shaft 1.2 and the motor transmission pin 1.1, the support connecting shaft 2.2 transmits the transmission torque to the screw rod 2.7.1 through the reliable connection with the transmission screw rod 2.7, the transmission torque is converted into the linear driving force of the nut seat 2.9 through the nut 2.7.2, under the positioning and guidance of the guide key 2.8, the nut seat 2.9 realizes the linear reciprocating driving in the feeding mechanism body seat 2.3. The output shaft 2.9.1 of the nut seat 2.9 transmits the reciprocating displacement through the rigid connection with the cooling air rotary distributor 3 and the rigid sealing connection of the rotary shaft 4.3 of the lubricating oil rotary distributor 4, the rotary shaft 4.3 finally realizes the output of the reciprocating displacement driving force through the rigid sealing connection with the transmission core rod assembly 5, and realizes the accurate displacement of the composite cutter.

[0035] After the main shaft core rod completes the driving feed, the transmission core rod assembly 5, the rotating shaft 4.3, and the cooling air rotating distributor rotating shaft 3.5 rotate at high speed with the main shaft, the lubricating oil rotating distributor shell 4.6 of the lubricating oil rotating distributor 4 remains stationary under the limitation of the lubricating oil rotating distributor limiting bracket 6.9 and the lubricating oil joint 4.5; the cooling air rotating distributor main body 3.2 of the cooling air rotating distributor 3 remains stationary under the limitation of the cooling air rotating distributor limiting bracket 6.7 and the air inlet joint 3.1.

[0036] During the operation of the main shaft, cooling air enters the central hole of the cooling air rotating distributor rotating shaft 3.5 through the air inlet joint 3.1, enters the central hole of the inner rod 5.2 of the transmission core rod through the central hole of the rotating shaft 4.3, and then flows to the inside of the combined cutter boring head to cool the cutter; one way of lubricating oil enters the inside of the lubricating oil rotating distributor 4 through the lubricating oil joint 4.1 and the lubricating oil joint 4.2 to lubricate; another way of lubricating oil enters the distribution hole of the lubricating oil rotating distributor 4 through the lubricating oil joint 4.5, flows to the annular channel between the inner rod 5.2 and the outer rod 5.3 of the transmission core rod, and flows to the inside of the combined cutter boring head to lubricate the mechanism.

[0037] The main shaft core rod driving feed device has compact structure, reasonable layout, high reliability, and is quick and convenient to install and disassemble, is very suitable for driving connection and installation of the transmission screw rod device, effectively meets the performance requirements of high precision, high rigidity, and high efficiency of the transmission screw rod, realizes the cooling and lubricating function requirements of the main shaft cutter, and plays an important role in improving the service life of the transmission screw rod driving feed device and the cutter.

[0038] In practical applications, all technical solutions and improvements that do not deviate from the essential content of the present application shall fall within the scope of the claims of the present application.

Claims

1. A machine tool spindle core rod drive feeding device, comprising: A micro drive unit (1), a feed mechanism (2), a cooling air rotary distributor (3), a lubricating oil rotary distributor (4), a transmission core rod assembly (5), and a bracket mounting unit (6); characterized in that: the micro drive unit (1) is flange-connected to the outside of the feed mechanism (2) by four bolts, the motor drive shaft (1.2) inside the micro drive unit (1) is matched with the support connecting shaft (2.2) in the feed mechanism (2) by a motor transmission pin (1.1); the nut seat (2.9) in the feed mechanism (2) passes through the matching hole of the feed mechanism main body seat (2.3) and is threadedly fastened to the cooling air rotary distributor main body (3.2) in the cooling air rotary distributor (3); the feed mechanism main body seat (2.3) outside the feed mechanism (2) and the feed mechanism mounting seat (6.1) in the bracket mounting unit (6) are precisely positioned by a first positioning key (2.16) and a second positioning key (2.17), and then fastened by bolts. The cooling air rotary distributor (3) and the lubricating oil rotary distributor (4) are connected by internal and external thread seals; the air inlet joint (3.1) in the cooling air rotary distributor (3) is matched with the cooling air rotary distributor rotation limiting bracket (6.7) in the bracket installation unit (6); the rotating shaft (4.3) in the lubricating oil rotary distributor (4) and the transfer core rod inner rod (5.2) in the transfer core rod assembly (5) are connected by plug-in seals of the lubricating oil rotary distributor rotating shaft seal (4.7); the rotating shaft (4.3) in the lubricating oil rotary distributor (4) and the transfer core rod outer rod (5.3) in the transfer core rod assembly (5) are connected by thread seals of the transfer core rod connection seal (5.1); the first lubricating oil joint (4.1) in the lubricating oil rotary distributor (4) is matched with the lubricating oil rotary distributor rotation limiting bracket (6.9) in the bracket installation unit (6) for installation.

2. The machine tool spindle core rod drive feeding device according to claim 1, characterized in that: The micro drive unit (1) comprises: a motor transmission pin (1.1), a motor transmission shaft (1.2), a positioning stop (1.3), a first connecting flange (1.4), and a micro motor body (1.5); the motor transmission pin (1.1) is mounted in cooperation with a mounting hole on the motor transmission shaft (1.2); the positioning stop (1.3) is positioned in cooperation with a motor stop hole (2.1.6) on a flange bearing seat (2.1); the first connecting flange (1.4) is connected to a motor connection threaded hole (2.1.8) of the flange bearing seat (2.1) by bolts; the micro motor body (1.5), the first connecting flange (1.4), the positioning stop (1.3), the motor transmission shaft (1.2), and the motor transmission pin (1.1) are installed in sequence from the outside to the inside.

3. The machine tool spindle core rod drive feeding device according to claim 1, characterized in that: The feeding mechanism (2) comprises: a flange bearing seat (2.1), a supporting connecting shaft (2.2), a feeding mechanism main body seat (2.3), a bearing positioning locking nut (2.4), a nut positioning locking nut (2.5), a transmission key (2.6), a transmission screw (2.7), a guide key (2.8), a nut seat (2.9), a detection switch assembly (2.10), a limit sleeve (2.11), a screw support bearing group (2.12), a stop screw (2.13), a pre-tightening nut (2.14), a support guide belt (2.15), a first positioning key (2.16), and a second positioning key (2.17); The transmission screw (2.7) is installed in conjunction with the hole of the support connecting shaft (2.2), and the transmission screw (2.7) is pressed by two stop screws (2.13); the screw support bearing group (2.12) is connected to the bearing of the support connecting shaft (2.2), and the bearing is pre-tightened and positioned by screwing the support connecting shaft (2.2) with the pre-tightening nut (2.14); the installation assembly of the transmission screw (2.7), the support connecting shaft (2.2), the screw support bearing group (2.12) and the pre-tightening nut (2.14) is installed in conjunction with the inner hole of the flange bearing seat (2.1), and the flange is screwed in with the bearing positioning lock nut (2.4). In the bearing seat (2.1), the outer ring of the screw support bearing group (2.12) is pressed and limited; the limiting sleeve (2.11) is a circular sleeve, and the limiting sleeve (2.11) is connected to the matching surface of the limiting sleeve of the support connecting shaft (2.2), and axial positioning is performed through the support connecting shaft (2.2); the inner ring of the limiting sleeve (2.11) safely limits the two ends of the motor drive shaft (1.2); the nut of the transmission screw (2.7) and the nut seat (2.9) are installed in conjunction with the transmission key (2.6), and axial positioning and locking are performed through the nut positioning lock nut (2.5); two sets of support guide belts (2.15) are installed on the nut seat In the guide groove of the outer circle of (2.9), the combination of the flange bearing seat (2.1), the supporting connecting shaft (2.2), the transmission screw (2.7), the screw support bearing group (2.12), and the nut seat (2.9) is installed in cooperation with the inner hole of the feed mechanism main seat (2.3) and is fastened through the flange connection hole of the flange bearing seat (2.1); the guide key (2.8) and the nut seat (2.9) are positioned and installed through the keyway, the protruding part of the guide key (2.8) is installed in cooperation with the guide groove of the feed mechanism main seat (2.3), and the detection switch assembly (2.10) is installed in cooperation with the guide groove mounting hole of the feed mechanism main seat (2.3).

4. The machine tool spindle core rod drive feeding device according to claim 1, characterized in that: The cooling air rotary distributor (3) comprises: an air intake joint (3.1), a cooling air rotary distributor body (3.2), a rotary shaft bearing group (3.3), a rotary shaft positioning nut (3.4), a cooling air rotary distributor rotary shaft (3.5), a rotary shaft pre-tightening nut (3.6), and a rotary shaft connecting sealing ring (3.7); the air intake joint (3.1) is threadedly connected to the air intake hole on the cooling air rotary distributor body (3.2); the cooling air rotary distributor rotary shaft (3.5) is matched with the rotary shaft bearing group (3.3) for installation; after the bearing is pre-tightened by the rotary shaft pre-tightening nut (3.6), the assembly of the cooling air rotary distributor rotary shaft (3.5), the rotary shaft bearing group (3.3), and the rotary shaft pre-tightening nut (3.6) is matched with the installation hole of the cooling air rotary distributor body (3.2) and positioned and installed by the rotary shaft positioning nut (3.4); the rotary shaft connecting sealing ring (3.7) is matched with the sealing groove of the threaded connection part of the cooling air rotary distributor rotary shaft (3.5).

5. The machine tool spindle core rod drive feeding device according to claim 1, characterized in that: The lubricating oil rotary distributor (4) comprises: a first lubricating oil joint (4.1), a second lubricating oil joint (4.2), a rotating shaft (4.3), a limiting screw (4.4), a third lubricating oil joint (4.5), a lubricating oil rotary distributor housing (4.6), and a lubricating oil rotary distributor rotating shaft seal (4.7); the first lubricating oil joint (4.1), the second lubricating oil joint (4.2), and the third lubricating oil joint (4.5) are respectively threadedly connected to three lubricating holes on the circumference of the lubricating oil rotary distributor housing (4.6); the rotating shaft (4.3) is matched with the center hole of the lubricating oil rotary distributor housing (4.6) and is axially positioned and locked by two limiting screws (4.4); the lubricating oil rotary distributor rotating shaft seal (4.7) is matched with the sealing groove of the inner hole of the output end of the rotating shaft (4.3) for installation.

6. The machine tool spindle core rod drive feeding device according to claim 1, characterized in that: The transfer core rod assembly (5) comprises: a transfer core rod connection seal (5.1), a transfer core rod inner rod (5.2), and a transfer core rod outer rod (5.3); the transfer core rod connection seal (5.1) is installed in cooperation with the internal thread sealing groove of the transfer core rod outer rod (5.3), and the transfer core rod inner rod (5.2) and the transfer core rod outer rod (5.3) are installed in a nested manner.

7. The machine tool spindle core rod drive feeding device according to claim 1, characterized in that: The bracket mounting unit (6) comprises: a feed mechanism mounting seat (6.1), a pad (6.2), a machine tool body (6.3), a feed mechanism mounting seat coarse positioning pin (6.4), a feed mechanism mounting seat adjustment pad (6.5), a cooling air rotary distributor rotation limiting seat (6.6), a cooling air rotary distributor rotation limiting bracket (6.7), a lubricating oil rotary distributor rotation limiting seat (6.8), and a lubricating oil rotary distributor rotation limiting bracket (6.9); the feed mechanism mounting seat (6.1) is connected to the pad (6.2) and the machine tool body (6.3) by The feed mechanism mounting seat is positioned by a coarse locating pin (6.4) and connected by bolts; the feed mechanism mounting seat adjustment pad (6.5) is connected to the feed mechanism mounting seat (6.1) and the machine tool body (6.3) by bolts; the cooling air rotary distributor rotation limit seat (6.6) is connected to the machine tool body (6.3) and the cooling air rotary distributor rotation limit bracket (6.7) by bolts; the lubricating oil rotary distributor rotation limit seat (6.8) is connected to the machine tool body (6.3) and the lubricating oil rotary distributor rotation limit bracket (6.9) by bolts.

8. The machine tool spindle core rod drive feeding device according to claim 3, characterized in that: The transmission screw rod (2.7) comprises a screw rod (2.7.1) and a nut (2.7.2); a ball-type stop positioning groove (2.7.3) and a third positioning key (2.7.4) are provided at the front polished rod connecting portion of the screw rod (2.7.1).

9. The machine tool spindle core rod drive feeding device according to claim 3, characterized in that: The nut seat (2.9) comprises an output shaft (2.9.1), a nut seat body (2.9.2), and a nut seat positioning keyway (2.9.3); the output shaft (2.9.1) and the nut seat body (2.9.2) are an integral structure, and two guide grooves (2.9.4) are provided on the outer circle of the nut seat body (2.9.2); a nut mounting hole (2.9.5), a nut positioning key (2.9.6), and a threaded hole (2.9.7) are sequentially provided inside.

10. The machine tool spindle core rod driving feeding device according to claim 3, characterized in that: The flange bearing seat (2.1) comprises a locking nut threaded hole (2.1.1), a bearing mounting positioning hole (2.1.2), an outer mounting surface (2.1.3), a drive connection cavity (2.1.4), a second connecting flange (2.1.5), a motor stop hole (2.1.6), a flange connection hole (2.1.7), and a motor connection threaded hole (2.1.8); a locking nut threaded hole (2.1.1), a bearing mounting positioning hole (2.1.2), and a drive connection cavity (2.1.4) are sequentially arranged inside the flange bearing seat (2.1); four flange connection holes (2.1.7) and four motor connection threaded holes (2.1.8) are arranged on the second connecting flange (2.1.5) of the flange bearing seat (2.1); a motor stop hole (2.1.6) is arranged on the back of the second connecting flange (2.1.5); and the outer mounting surface (2.1.3) and the second connecting flange (2.1.5) are integrated.

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