A numerical control milling machine feeding system

Abstract

This invention discloses a CNC milling machine feed system, relating to the field of CNC milling machine technology. It includes a frame with a feeding rack on top. Through a series of structural features, this invention mechanically releases the additional thrust on the bearings caused by the thermal expansion of the lead screw without relying on any external cooling pipes or sensors. This significantly improves the thermal stability and long-term positioning accuracy of the feed system, absorbs installation angle deviations, avoids off-center wear, extends the service life of the lead screw pair, achieves integrated lubrication and dust prevention through pure mechanical self-maintenance, reduces the frequency of manual maintenance, improves equipment reliability and service life, replaces frequent manual handling and material placement, shortens machine tool waiting time, and allows the finished product area to rotate intermittently around a support shaft driven by a stepper motor, enabling operators to retrieve machined parts from different directions without moving, optimizing the logistics path and realizing continuous production management in an assembly line manner.

Description

Technical Field

[0001] This invention relates to the field of CNC milling machine technology, specifically to a CNC milling machine feed system. Background Technology

[0002] The feed system of a CNC milling machine is a core component of the CNC milling machine. Its function is to convert the motion commands issued by the CNC system into precise linear motion of the worktable or spindle, thereby realizing the relative position control between the workpiece and the tool. A typical feed system usually consists of components such as a drive motor, coupling, ball screw pair, nut seat, bearing support seat and worktable. Among them, the ball screw pair is the key transmission element that converts rotary motion into linear motion, and its accuracy and stability directly affect the machining quality of the machine tool.

[0003] In existing technologies, the feed systems of CNC milling machines generally suffer from the following problems: First, the ball screw undergoes axial thermal elongation due to frictional heat during high-speed operation, causing changes in bearing preload and affecting positioning accuracy and repeatability. Second, the nut seat and the worktable are usually connected by a rigid flange, which cannot effectively absorb installation errors and vibrations generated during cutting, easily leading to uneven wear of the ball screw pair and shortening its service life. Third, lubrication of the ball nuts mostly relies on manual periodic oiling, which can easily result in untimely lubrication or excessive contamination. Furthermore, the dustproof structure at the nut end is relatively simple. Chips and coolant can easily penetrate the raceway, accelerating the wear of the raceway and balls; fourth, in traditional feeding systems, the handling of materials to be processed and the collection of finished materials rely heavily on manual operation, lacking automatic feeding and centralized management functions for finished products, resulting in low material flow efficiency. Operators need to frequently travel between the material rack and the machine tool, increasing labor intensity and production auxiliary time; fifth, the finished product storage boxes are mostly fixed structures, requiring operators to detour or move them when retrieving materials from different workstations, which is not conducive to continuous production management in an assembly line. Furthermore, disassembling and replacing finished product boxes when they are full is inconvenient, affecting overall production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a CNC milling machine feed system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a CNC milling machine feed system, including a frame, a feeding rack on the top of the frame, four lead screw seats mounted on the top of the feeding rack, two lead screw seats forming a group, and a lead screw component connected to the interior of each group of two lead screw seats via bearings, with positioning areas at both ends of the lead screw component, and a compensation sleeve on the outer surface of the positioning area, the compensation sleeve being conical, with the large end face of the compensation sleeve facing the bearing, and several inlaid rings arranged on the outer surface of the compensation sleeve, an end cover detachably mounted on the front end of the lead screw seat, a support cylinder installed inside the end cover, and several uprights slidably connected inside the support cylinder, with one end of each upright extending out of the support cylinder; Two nuts are threaded onto the outer surfaces of the two lead screw components. A bearing platform is connected to the top of all four nuts. An oil filling chamber is located on one side of each of the four nuts on the outer surface of the lead screw component. The inner wall of each oil filling chamber has a reverse thread opposite to the lead screw thread. A dustproof chamber is located on one side of each oil filling chamber. A flip cover is hinged to one side of the dustproof chamber. A groove is located on one side of the dustproof chamber. A first side magnetic block is installed inside the groove. A second side magnetic block is hinged to one side of the first side magnetic block. A support module is located on one side of the working area. The support module contains a finished product box rack. A processing box rack is located above the finished product box rack. A finished product area is placed on top of the finished product box rack. A processing placement area is placed on top of the processing box rack. A side frame is located on one side of the finished product area. A slot is located on the top of the side frame. A stepper motor is located at the front end of the working area. A transmission assembly is located on top of the stepper motor. A drive shaft is located at the bottom of the transmission assembly. The drive shaft matches the slot.

[0006] Preferably, the top of the feeding rack is provided with a working area, and a control body is provided on one side of the working area. One end of the two lead screws is connected to a drive module, and the bottom of the drive module is installed on the top of the feeding rack.

[0007] Preferably, three ball-head columns are provided on both sides of the bottom end of the lead screw seat, and a countersunk hole is provided on the top of the feeding frame at the position corresponding to the ball-head columns, and a corrugated pad is provided inside the countersunk hole.

[0008] Preferably, four cross spring assemblies are provided at the bottom end of the lead screw seat near the ball head column, the bottom of the four cross spring assemblies are installed on the top of the feeding frame, and torsion springs are provided at the four corners of each cross spring assembly.

[0009] Preferably, a turntable is provided inside the support cylinder near the upright position. One side of the turntable is provided with several arc-shaped protrusions corresponding to the upright. The support cylinder extends from the other side of the turntable. A fine-tuning knob is provided at the extended end of the turntable. Several ratchet teeth are arranged on the circumferential surface of the fine-tuning knob. A pawl structure is provided at the top of the ratchet teeth. One side of the pawl structure is installed inside the support cylinder through a spring telescopic rod.

[0010] Preferably, a return spring is provided on the outer surface of the upright, one end of the return spring is installed inside the support cylinder, and the extended end of the upright is provided with an end cap.

[0011] Preferably, a lubricating oil tank is provided on the top of the oil filling tank, and an oil nozzle is provided between the lubricating oil tank and the oil filling tank.

[0012] Preferably, a raised area is provided on one side of the flip cover, and a threaded port is provided at one end of the groove, with a fixed cover threadedly connected to the outer surface of the threaded port.

[0013] Preferably, a supporting corner frame is provided on one side of the finished product material box frame, the top of the supporting corner frame is connected to the box frame to be processed, and spring telescopic support frames are provided on both sides of the bottom end of the finished product material box frame. The bottom ends of the two spring telescopic support frames are connected to a base, and a support shaft is provided on one side of the top end of the spring telescopic support frame.

[0014] Preferably, the bottom of the processing placement area is provided with a bottom frame, and telescopic rods are provided at the top two sides of the bottom frame, and both telescopic rods extend into the interior of the processing placement area. A drive gear is provided on one side of each telescopic rod inside the processing placement area, and a micro motor is provided at the middle position of each of the two drive gears. A feeding module is provided inside the bottom frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This CNC milling machine feed system incorporates tapered compensation sleeves at the positioning areas of both ends of the lead screw. Several inlaid rings made of a low-expansion-coefficient alloy are arranged on the outer surface of these sleeves. Utilizing a combination of materials with different expansion coefficients, the compensation sleeves undergo a slight displacement opposite to the thermal elongation of the lead screw as temperature changes. The large end of the compensation sleeve faces the bearing, and the small end faces the outside of the lead screw seat. When the lead screw heats up during operation, the outer steel layer tends to elongate axially, but the low expansion characteristics of the inner inlaid rings restrain this elongation. This results in a much smaller increase in the overall effective axial positioning length of the compensation sleeve compared to a solid steel sleeve of the same size, and even a slight retraction trend. Consequently, the positioning shoulder of the bearing outer ring experiences a slight clearance opposite to the thermal elongation of the lead screw as temperature rises. This structure, without relying on any external cooling pipes or sensors, mechanically releases the additional thrust of the lead screw's thermal expansion on the bearing, significantly improving the thermal stability and long-term positioning accuracy of the feed system.

[0016] This CNC milling machine's feed system features three ball-end columns positioned on both sides of the bottom edge of the lead screw seat, with corresponding countersunk holes on the top of the feed rack. Corrugated pads are installed within these countersunk holes, forming a three-point supported floating connection structure. The ball heads of the ball-end columns make point contact with the hemispherical contact surfaces of the countersunk holes. The corrugated pads apply continuous axial preload to the ball-end columns, eliminating gaps between the ball heads and the countersunk holes and preventing reversing impacts. Simultaneously, four cross-spring assemblies are positioned near the ball-end columns at the bottom of the lead screw seat. Torsion springs are placed at the four corners of these cross-spring assemblies to circumferentially constrain the lead screw seat in the horizontal direction, preventing torsion or lateral swaying while allowing for minor angular adjustments. This structure effectively absorbs installation angle deviations, avoids eccentric wear, and extends the service life of the lead screw assembly.

[0017] This CNC milling machine's feed system utilizes an oil filling chamber on one side of the nut. The inner wall of the oil filling chamber has a reverse thread, opposite to the lead screw thread. The rotation of the lead screw generates a pumping effect, continuously pushing lubricating oil from the oil filling chamber to the nut raceway inlet, achieving continuous self-lubrication. A lubricating oil tank is located at the top of the oil filling chamber, with an oil nozzle between the two. The oil nozzle contains a one-way valve to prevent backflow of lubricating oil and reverse intrusion of external contaminants. Simultaneously, a dustproof chamber is located on one side of the oil filling chamber, containing a first-side magnetic block and a second-side magnetic block, forming an openable magnetic attraction channel to attract... Ferromagnetic cutting powder; a hinged flap is installed on one side of the dustproof chamber, with a raised area on the flap to press the oil-impregnated felt strip when the flap is closed, causing the felt strip to partially bulge and contact the outer surface of the lead screw, wiping the lead screw during rotation and removing attached chips and coolant; a threaded port is provided at one end of the groove, and a fixed cover is threaded to the outer surface of the threaded port to press and fix the flap, preventing it from opening accidentally when the machine tool vibrates. This structure achieves integrated lubrication and dust prevention, purely mechanical self-maintenance, reducing the frequency of manual maintenance and improving the reliability and service life of the equipment.

[0018] This CNC milling machine's feed system integrates a support module, finished product area, workpiece placement area, stepper motor, transmission components, and drive shaft. A spring-loaded telescopic support frame is installed at the bottom of the finished product bin. This achieves automatic feeding of workpieces, rotational unloading of finished products, and convenient assembly / disassembly of the finished product bin. The feeding module, in conjunction with the telescopic rod and drive gear, pushes the workpieces to the machining station one by one, replacing frequent manual handling and placement of materials, thus shortening machine waiting time. The finished product area, driven by the stepper motor, rotates intermittently around the support shaft, allowing operators to retrieve machined parts from different directions without moving, optimizing the logistics path and realizing continuous production management in an assembly line manner. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structural connection state of the present invention; Figure 2 This is a schematic diagram of the lead screw structure of the present invention; Figure 3 This is a schematic diagram of the lead screw seat structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the compensation sleeve structure of the present invention; Figure 6 This is a schematic cross-sectional view of the support cylinder structure of the present invention; Figure 7 This is a schematic diagram of the support platform structure of the present invention; Figure 8 This is a schematic diagram of the oil injection tank structure of the present invention; Figure 9 This is a partial cross-sectional schematic diagram of the oil injection tank structure of the present invention; Figure 10 This is a schematic diagram of the support module structure of the present invention; Figure 11 This is a schematic cross-sectional view of the structure of the processing placement area of ​​the present invention; Figure 12 This is a schematic cross-sectional view of the finished product area structure of the present invention.

[0020] In the diagram: 1. Frame; 2. Working area; 3. Control unit; 4. Lead screw assembly; 5. Support platform; 6. Feed rack; 7. Lead screw seat; 701. Ball head column; 8. Drive module; 9. Support cylinder; 10. End cap; 11. Countersunk hole; 12. Corrugated pad; 13. Cross spring assembly; 1301. Torsion spring assembly; 14. Positioning area; 15. Compensation sleeve; 16. Fine adjustment knob; 17. Inlaid ring; 18. Arc-shaped protrusion; 19. Pawl structure; 20. Racket tooth; 21. End; 22. Column; 23. Turntable; 24. Return spring assembly; 25. Nut; 26. Lubricating oil tank; 27. Oil filling tank; 28. Dustproof tank; 29. ​​Groove; 30. First side magnetic block 31. Second side magnetic block; 32. Threaded port; 33. Protrusion area; 34. Flip cover; 35. Fixed cover; 36. Oil nozzle; 37. Reverse thread; 38. Support module; 3801. Base; 3802. Finished product box rack; 3803. Spring telescopic support frame; 3804. Support shaft; 3805. Support corner frame; 3806. Box rack to be processed; 39. Transmission assembly; 40. Stepper motor; 41. Drive shaft; 42. Finished product area; 4201. Side frame; 4202. Slot; 43. Placement area to be processed; 4301. Telescopic rod; 4302. Micro motor; 4303. Drive gear; 4304. Bottom frame; 4305. Feeding module. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] like Figures 1 to 9As shown, the CNC milling machine feed system of this embodiment includes a frame 1. A feed rack 6 is mounted on the top of the frame 1 to support and guide the moving parts in the feed direction. Four lead screw seats 7 are mounted on the top of the feed rack 6 to support and position the lead screw 4, ensuring its rotation axis is aligned with the feed direction. Two lead screw seats 7 form a group, and the lead screw 4 is connected internally to two lead screw seats 7 via bearings, converting rotational motion into linear motion to drive the support platform 5. Positioning areas 14 are provided at both ends of the lead screw 4 for mounting bearings and compensation sleeves 15, providing axial and radial support for the lead screw. Compensation sleeves 15 are provided on the outer surface of the positioning areas 14 to compensate for axial displacement caused by thermal expansion of the lead screw, preventing bearing overload. The compensation sleeves 15 are tapered, facilitating differentiated thermal expansion deformation in the axial direction for directional compensation. The large end face of the compensation sleeve 15 faces the bearing and is used to generate a slight displacement towards the bearing when heated to counteract the thermal expansion of the lead screw. Several inlaid rings 17 are arranged on the outer surface of the compensation sleeve 15 to adjust the overall thermal expansion coefficient of the compensation sleeve 15 by combining materials with different expansion coefficients, so that it generates the expected axial deformation with temperature changes. The front end of the lead screw seat 7 is detachably installed with an end cover 10 to close the internal space of the lead screw seat 7, protect the bearing and the compensation sleeve 15, and facilitate maintenance. A support cylinder 9 is installed inside the end cover 10 to accommodate and guide the uprights 22, providing a stable mounting base for the fine-tuning mechanism. Several uprights 22 are slidably connected inside the support cylinder 9, and one end of the uprights 22 extends out of the support cylinder 9 to generate axial displacement under the drive of the fine-tuning mechanism, thereby pushing the compensation sleeve 15 or the bearing to achieve precise adjustment of the initial position in the cold state. Two nuts 25 are threaded onto the outer surfaces of the two lead screw components 4, respectively, to convert the rotational motion of the lead screw into the linear motion of the nuts 25, thereby moving the bearing platform 5. The tops of the four nuts 25 are connected to the bearing platform 5, which carries the workpiece and moves it along the lead screw axis to achieve feed motion. Each of the four nuts 25 on the surface of the lead screw component 4 has an oil filling chamber 27 on one side, used to store and supply lubricating oil to the raceway of the nuts 25 for continuous lubrication. The inner wall of the oil filling chamber 27 has a reverse thread 37 opposite to the thread of the lead screw component 4, which generates a pumping effect when the lead screw rotates, pushing the lubricating oil from the oil filling chamber 27 to the inlet of the nut 25 raceway, achieving... Self-lubricating; a dustproof chamber 28 is provided on one side of the oil filling chamber 27 to prevent external chips and coolant from entering the oil filling chamber 27 and the raceway of the nut 25; a hinged cover 34 is installed on one side of the dustproof chamber 28 to open or close the dustproof chamber 28 for easy cleaning of accumulated chips and replacement of dustproof material; a groove 29 is provided on one side of the dustproof chamber 28 to accommodate the first side magnetic block 30 and the second side magnetic block 31, forming a magnetic sealing structure; the first side magnetic block 30 is installed inside the groove 29 to provide magnetic attraction, adsorb ferromagnetic chip powder, and prevent it from entering the interior of the dustproof chamber 28; the second side magnetic block 31 is hinged on one side of the first side magnetic block 30. A support module 38 is provided on one side of the work area 2 to form an openable magnetic channel in conjunction with the first side magnetic block 30, facilitating the cleaning of adsorbed chips. The support module 38 provides a basic support for centralized storage and automatic transfer of materials to be processed and finished materials. The support module 38 contains a finished product storage box 3802 to support the finished material storage box. Above the finished product storage box 3802 is a processing box 3806 for layered arrangement of materials to be processed and finished products, achieving upper and lower zone management. The top of the finished product storage box 3802 houses the finished product area 42 for collecting and temporarily storing finished workpieces. The processing box 3806... The top of the work area 42 has a processing placement area 43 for pre-stacking the blanks to be processed; a side frame 4201 is provided on one side of the finished product area 42 for connecting the drive mechanism and transmitting rotational power; a slot 4202 is provided on the top of the side frame 4201 for inserting and engaging with the drive shaft 41 to achieve power coupling; a stepper motor 40 is provided at the front end of the work area 2 for providing intermittent rotational driving force; a transmission assembly 39 is provided on the top of the stepper motor 40 for transmitting the power of the stepper motor 40 to the drive shaft 41; a drive shaft 41 is provided at the bottom of the transmission assembly 39 for inserting into the slot 4202 to drive the finished product area 42 and the processing placement area 43 to rotate synchronously.

[0024] Specifically, the top of the feed rack 6 is provided with a working area 2 for placing workpieces or fixtures to be processed, providing a working area for processing operations; a control unit 3 is provided on one side of the working area 2 for installing the control system and human-machine interface to realize the programming control and status monitoring of the feed system; one end of the two lead screws 4 is connected to a drive module 8, which provides rotational power to drive the two lead screws 4 to rotate synchronously, ensuring the smooth movement of the support platform 5; the bottom of the drive module 8 is installed on the top of the feed rack 6 to fix the drive module 8 to the feed rack 6, ensuring the stability of power transmission.

[0025] Furthermore, three ball-head columns 701 are provided on both sides of the bottom edge of the lead screw seat 7, which are used to cooperate with the countersunk holes 11 on the top of the feeding frame 6 to form a floating connection with three-point support, automatically absorbing installation angle deviation; the top of the feeding frame 6 is provided with countersunk holes 11 at the corresponding positions of the ball-head columns 701, which are used to accommodate the ball head part of the ball-head column 701 and provide a hemispherical contact surface to achieve point contact self-alignment; a corrugated pad 12 is provided inside the countersunk hole 11 to apply a continuous axial preload to the ball-head column 701, eliminate the gap between the ball head and the countersunk hole 11, and prevent reversing impact.

[0026] Furthermore, four cross spring assemblies 13 are provided at the bottom end of the lead screw seat 7 near the ball head column 701 to circumferentially constrain the lead screw seat 7 in the horizontal direction, preventing it from twisting or laterally swinging, while allowing for slight angular adjustments. The bottom of the four cross spring assemblies 13 is mounted on the top of the feed frame 6 to fix the spring assembly to the feed frame 6, forming a stable elastic constraint boundary. Torsion springs 1301 are provided at the four corners of the cross spring assembly 13 to provide elastic restoring force when the spring is subjected to torsional force, enhancing the torsional resistance and reset performance of the cross spring.

[0027] Furthermore, a turntable 23 is provided inside the support cylinder 9 near the upright 22 to convert the rotational motion into the axial linear motion of the upright 22, thereby achieving fine-tuning drive. One side of the turntable 23 has several arc-shaped protrusions 18 corresponding to the upright 22, which push the upright 22 sequentially as the turntable 23 rotates, causing axial displacement and enabling multi-position synchronous or step-by-step adjustment. The other side of the turntable 23 extends from the support cylinder 9 to connect to external operating components, facilitating manual or tool-driven rotation of the turntable 23. A fine-tuning knob 16 is provided at the extended end of the turntable 23 for handheld or tool-operated operation. The interface allows the operator to easily rotate the turntable 23 for precise fine-tuning. The circumferential surface of the fine-tuning knob 16 is provided with several ratchet teeth 20, which are used to cooperate with the pawl structure 19 to realize the unidirectional stepping rotation and position locking of the turntable 23. The top of the ratchet teeth 20 is provided with a pawl structure 19, which is used to engage in the groove of the ratchet teeth 20 to prevent the fine-tuning knob 16 from rotating back due to vibration after adjustment, thus ensuring the stability of the adjustment position. One side of the pawl structure 19 is installed inside the support cylinder 9 through a spring telescopic rod to provide the elastic force for the pawl to press against the ratchet teeth 20, so that it automatically skips teeth when the turntable 23 rotates and automatically locks when it stops.

[0028] Furthermore, a return spring 24 is provided on the outer surface of the upright 22, which is used to push the upright 22 back to the initial position after the arc-shaped protrusion 18 of the turntable 23 leaves the upright 22, so as to realize reciprocating adjustment; one end of the return spring 24 is installed inside the support cylinder 9, which is used to fix the spring to the inner wall of the support cylinder 9 and provide a stable return force for the upright 22; the extended end of the upright 22 is provided with an end head 21, which is used to increase the contact area between the upright 22 and the compensation sleeve 15 or the bearing, so as to avoid point contact causing local indentation or stress concentration.

[0029] Furthermore, a lubricating oil tank 26 is provided on the top of the oil filling tank 27 to store a large capacity of lubricating oil and provide a continuous oil supply to the oil filling tank 27; an oil nozzle 36 is provided between the lubricating oil tank 26 and the oil filling tank 27 to control the amount of lubricating oil supplied from the oil tank to the oil filling tank 27; a one-way valve is provided in the oil nozzle 36 to prevent backflow of lubricating oil and reverse intrusion of external contaminants.

[0030] Furthermore, a raised area 33 is provided on one side of the flip cover 34, which is used to press the oil-impregnated felt strip when the flip cover 34 is closed, so that the felt strip partially protrudes and contacts the outer surface of the lead screw, thereby wiping the lead screw during the rotation of the lead screw and removing the attached chips and coolant; a threaded port 32 is provided at one end of the groove 29, which is used to connect the fixing cover 35 to form a detachable sealing structure; the outer surface of the threaded port 32 is threaded with the fixing cover 35, which is used to press the first side magnetic block 30 to prevent it from falling off accidentally when the machine tool vibrates.

[0031] Furthermore, a side frame 4201 is provided on one side of the finished product area 42 for mounting a slot 4202 and cooperating with the drive shaft 41 to achieve rotation; a slot 4202 is provided on the top of the side frame 4201 for insertion into the drive shaft 41, so that the finished product area 42 rotates intermittently around the vertical axis under the drive of the stepper motor 40, which facilitates the operator to pick up materials nearby between the front and rear processes of the production line; a stepper motor 40 is provided at the front end of the work area 2 for driving the finished product area 42 to rotate according to a set rhythm; a transmission assembly 39 is provided on the top of the stepper motor 40 for transmitting the rotational motion of the stepper motor 40 to the drive shaft 41; a drive shaft 41 is provided at the bottom of the transmission assembly 39 for matching with the slot 4202 to drive the finished product area 42 to rotate, realizing continuous material flow management in a production line.

[0032] Furthermore, spring telescopic support frames 3803 are provided on both sides of the bottom edge of the finished product box frame 3802. These frames are used to adjust the vertical height of the finished product box frame 3802 through elastic telescopic adjustment. This allows the finished product area 42 to be raised and disassembled from the drive shaft 41 when fully loaded, and to be lowered after the empty box is in place so that the slot 4202 can re-engage with the drive shaft 41 for installation. The bottom ends of the two spring telescopic support frames 3803 are connected to a base 3801, which provides stable bottom support for the spring telescopic support frames 3803. A support shaft 3804 is provided on one side edge of the top of the spring telescopic support frame 3803. The support shaft 3804 is rotatably connected to the bottom of the side frame 4201, ensuring that the finished product box frame 3802 can be driven to rotate.

[0033] The usage method of this embodiment is as follows: First, the two lead screw components 4 are driven to rotate synchronously by the drive module 8. The lead screw components 4 drive the threaded nut 25 to move axially, thereby driving the bearing platform 5 and the workpiece on it to perform feed motion. During the movement, the inlaid rings 17 arranged on the outer surface of the compensation sleeve 15 undergo differential expansion due to temperature changes, causing the tapered compensation sleeve 15 to produce a slight displacement opposite to the thermal elongation direction of the lead screw, automatically compensating for thermal deformation and preventing bearing overload. At the same time, the ball head column 701 at the bottom of the lead screw seat 7 cooperates with the corrugated pad 12 in the countersunk hole 11 at the top of the feed rack 6 to form a three-point support floating connection, which cooperates with the cross spring assembly 13 and its four The torsion spring 1301 automatically absorbs installation angle deviations to ensure smooth transmission. Furthermore, when the lead screw rotates, the reverse thread 37 on the inner wall of the oil filling chamber 27, opposite to the lead screw thread, generates a pumping effect, continuously pushing lubricating oil from the oil filling chamber 27 to the raceway inlet of the nut 25, achieving self-lubrication. The lubricating oil chamber 26 at the top of the oil filling chamber 27 replenishes lubricating oil to the oil filling chamber 27 through the oil nozzle 36. The one-way valve inside the oil nozzle 36 prevents backflow of lubricating oil. The first side magnetic block 30 and the second side magnetic block 31 in the dustproof chamber 28 adsorb ferromagnetic cutting powder. When the flip cover 34 is closed, the protrusion area 33 on it presses against the oil-impregnated felt strip, causing the felt strip to partially bulge and press against the outer surface of the lead screw. During the rotation of the lead screw, the surface of the lead screw is wiped to remove adhering chips and coolant. The fixed cover 35 presses the flip cover 34 through the threaded port 32 to prevent it from opening accidentally during vibration. When fine adjustment of the initial cold position is required, the turntable 23 is rotated by the fine adjustment knob 16. The arc-shaped protrusions 18 on the turntable 23 push the upright 22 in sequence. The upright 22 slides along the axis of the support cylinder 9 and pushes the compensation sleeve 15 or the bearing to achieve precise adjustment of axial displacement. The circumferential ratchet 20 of the fine adjustment knob 16 cooperates with the pawl structure 19 to achieve unidirectional stepping rotation and position locking. After the adjustment is completed, the reset spring 24 pushes the upright 22 back to the initial position. At the same time, the workpiece is placed... The pre-stacked blanks to be processed in zone 43 are pushed one by one to the processing station on the support platform 5 by the feeding module 4305 inside the bottom frame 4304 in conjunction with the telescopic rod 4301 and the drive gear 4303, driven by the micro motor 4302, so as to realize the automated continuous feeding of the blanks to be processed. After processing, the finished products fall into the finished product zone 42. The stepper motor 40 drives the drive shaft 41 to rotate through the transmission component 39. The drive shaft 41 is inserted into the slot 4202 at the top of the side frame 4201, which drives the finished product zone 42 to rotate intermittently around the vertical axis, so that the processed parts in different positions are turned to the picking port in sequence, which makes it convenient for operators to pick up materials nearby between the front and back processes of the production line.When the finished product area 42 needs to be replaced, the spring telescopic support frame 3803 rises, disengaging the finished product area 42 from the drive shaft 41 for easy disassembly. After the empty box is in place, the spring telescopic support frame 3803 rises, re-engaging the slot 4202 with the drive shaft 41. The support shaft 3804 is rotatably connected to the bottom of the side frame 4201, ensuring that the finished product box frame 3802 can be driven to rotate.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A CNC milling machine feed system, comprising a frame (1), characterized in that: The top of the frame (1) is provided with a feeding rack (6), and the top of the feeding rack (6) is provided with four lead screw seats (7). Two lead screw seats (7) are a group. The two lead screw seats (7) in each group are connected to a lead screw component (4) through a bearing. Both ends of the lead screw component (4) are provided with positioning areas (14). The outer surface of the positioning area (14) is provided with a compensation sleeve (15). The compensation sleeve (15) is conical. The large end face of the compensation sleeve (15) faces the bearing. The outer surface of the compensation sleeve (15) is provided with several inlaid rings (17). The front end of the lead screw seat (7) is detachably installed with an end cover (10). The end cover (10) is installed with a support cylinder (9). The support cylinder (9) is slidably connected with several uprights (22), and one end of the uprights (22) extends out of the support cylinder (9). Two nuts (25) are threaded to the outer surfaces of the two lead screw components (4), and a bearing platform (5) is connected to the top of the four nuts (25). An oil filling chamber (27) is provided on one side of each of the four nuts (25) on the outer surface of the lead screw component (4). The inner wall of the oil filling chamber (27) is provided with a reverse thread (37) opposite to the thread of the lead screw component (4). A dustproof chamber (28) is provided on one side of the oil filling chamber (27). A flip cover (34) is hinged to one side of the dustproof chamber (28). A groove (29) is provided on one side of the dustproof chamber (28). A first side magnetic block (30) is installed inside the groove (29). A second side magnetic block (31) is hinged to one side of the first side magnetic block (30). A support is provided on one side of the working area (2). The support module (38) contains a finished product box rack (3802) inside. A processing box rack (3806) is provided above the finished product box rack (3802). A finished product area (42) is placed on the top of the finished product box rack (3802). A processing placement area (43) is placed on the top of the processing box rack (3806). A side frame (4201) is provided on one side of the finished product area (42). A slot (4202) is opened on the top of the side frame (4201). A stepper motor (40) is provided at the front end of the working area (2). A transmission assembly (39) is provided on the top of the stepper motor (40). A drive shaft (41) is provided at the bottom of the transmission assembly (39). The drive shaft (41) matches the slot (4202).

2. The CNC milling machine feed system according to claim 1, characterized in that: The top of the feeding rack (6) is provided with a working area (2), and a control body (3) is provided on one side of the working area (2). One end of the two lead screws (4) is connected to a drive module (8), and the bottom of the drive module (8) is installed on the top of the feeding rack (6).

3. The CNC milling machine feed system according to claim 1, characterized in that: Three ball head columns (701) are provided on both sides of the bottom end of the lead screw seat (7). A countersunk hole (11) is provided at the top of the feeding rack (6) corresponding to the ball head columns (701). A corrugated pad (12) is provided inside the countersunk hole (11).

4. The CNC milling machine feed system according to claim 2, characterized in that: Four cross spring assemblies (13) are provided at the bottom end of the lead screw seat (7) near the ball head column (701). The bottom of the four cross spring assemblies (13) is installed at the top of the feed rack (6). Torque springs (1301) are provided at the four corners of the cross spring assemblies (13).

5. The CNC milling machine feed system according to claim 1, characterized in that: A turntable (23) is provided inside the support cylinder (9) near the upright (22). A number of arc-shaped protrusions (18) corresponding to the upright (22) are provided on one side of the turntable (23). The support cylinder (9) extends out from the other side of the turntable (23). A fine adjustment knob (16) is provided at the extended end of the turntable (23). A number of ratchet teeth (20) are arranged on the circumferential surface of the fine adjustment knob (16). A pawl structure (19) is provided at the top of the ratchet teeth (20). One side of the pawl structure (19) is installed inside the support cylinder (9) by a spring telescopic rod.

6. The CNC milling machine feed system according to claim 1, characterized in that: The outer surface of the upright (22) is provided with a reset spring (24), one end of the reset spring (24) is installed inside the support cylinder (9), and the extended end of the upright (22) is provided with an end (21).

7. The CNC milling machine feed system according to claim 1, characterized in that: The top of the oil filling tank (27) is provided with a lubricating oil tank (26), and an oil nozzle (36) is provided between the lubricating oil tank (26) and the oil filling tank (27).

8. The CNC milling machine feed system according to claim 1, characterized in that: The flip cover (34) has a raised area (33) on one side, and a threaded port (32) is provided at one end of the groove (29). A fixed cover (35) is threadedly connected to the outer surface of the threaded port (32).

9. The CNC milling machine feed system according to claim 1, characterized in that: A support bracket (3805) is provided on one side of the finished product material box rack (3802). The top of the support bracket (3805) is connected to the box rack (3806) to be processed. Spring telescopic support brackets (3803) are provided on both sides of the bottom end of the finished product material box rack (3802). The bottom ends of the two spring telescopic support brackets (3803) are connected to a base (3801). A support shaft (3804) is provided on one side of the top end of the spring telescopic support bracket (3803).

10. The CNC milling machine feed system according to claim 1, characterized in that: The bottom of the processing placement area (43) is provided with a bottom frame (4304). Telescopic rods (4301) are provided on both sides of the top of the bottom frame (4304), and both telescopic rods (4301) extend into the interior of the processing placement area (43). A drive gear (4303) is provided on one side of the telescopic rod (4301) inside the processing placement area (43). A micro motor (4302) is provided at the middle position of the two drive gears (4303). A feeding module (4305) is provided inside the bottom frame (4304).

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