A feeding device for CNC machine tool machining

Abstract

The application relates to the technical field of numerical control machine tools, and discloses a feeding device for CNC machine tool machining, which comprises a bed body, a feeding mechanism is arranged in the interior of the bed body, the feeding mechanism comprises a servo motor fixedly connected to one end of the interior of the bed body, a shaft coupling coaxially fixedly connected with an output shaft of the servo motor, a lead screw fixedly connected with one end of the shaft coupling, a guide rod arranged on the same horizontal side of the lead screw, a feeding base movably connected with the top ends of the lead screw and the guide rod, the feeding base comprises a slide saddle for bearing a moving part and a base support assembly arranged at both ends of the slide saddle, through the base support assembly, during the movement of the slide saddle, oil continuously leaks from an oil outlet to the interiors of a sliding sleeve one and a sliding sleeve two to lubricate and cool the contact surfaces of the two sliding sleeves, the lead screw and the guide rod, targeted lubrication and cooling are carried out on the intensified friction and heating after the pre-tightening of the lead screw nut, and the equipment operation efficiency is improved and the equipment service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tool technology, and more specifically to a feed device for CNC machine tool machining. Background Technology

[0002] CNC machine tools, short for Computer Numerical Control Machine Tools, are automated machine tools equipped with a program control system. This control system logically processes programs with control codes or other symbolic instructions, decodes them, represents them with coded numbers, and inputs them into the CNC device via an information carrier. After processing, the CNC device sends various control signals to control the machine tool's movements, automatically machining parts according to the shape and dimensions required by the drawings.

[0003] In CNC machine tool machining, the feed device is one of the core driving components of the entire system. It accurately converts instructions into linear or rotary motion of the tool (or workpiece) in a specified direction, and is a key factor that determines machining accuracy, surface quality, efficiency and dynamic performance.

[0004] Backlash is a common phenomenon in mechanical transmission systems. It refers to the failure of the active component (such as a motor or gear) to immediately transmit its motion to the driven component when the transmission direction changes, resulting in a brief period of "idling" or "lag". This phenomenon is usually caused by gaps or looseness between mechanical components.

[0005] Current technology has shortcomings: While preloading the lead screw nut aims to eliminate backlash and improve axial stiffness, this also exacerbates friction and heat generation. Therefore, targeted lubrication and heat dissipation are necessary. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a feed device for CNC machine tool processing to solve the problems existing in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a feed device for CNC machine tool processing, comprising a bed, wherein a feed mechanism is mounted inside the bed, the feed mechanism comprising a servo motor fixedly connected to one end inside the bed, a coupling fixedly connected coaxially to the output shaft of the servo motor, and a lead screw fixedly connected to one end of the coupling, the lead screw being horizontally arranged inside the bed and rotatably connected to the inner wall of the bed through a first bearing seat adapted to one end thereon, a guide rod being provided on the same horizontal side of the lead screw, the guide rod being fixedly connected to the inner wall of the bed through mounting seats adapted to both ends thereon, and a feed base being movably connected to the top ends of the lead screw and the guide rod;

[0008] The feeding base comprises a saddle for carrying a moving part, a base support assembly provided at both ends of the saddle and matched with a lead screw and a guide rod, a nut seat and a sliding sleeve three provided inside the saddle and fixedly connected with the saddle, and a lead screw nut provided inside the nut seat and matched with the lead screw.

[0009] Further, the base support assembly is symmetrically provided at both ends of the saddle, and the sliding sleeve one and the sliding sleeve two are cylindrical, with their end faces near the outside of the saddle flush with the outer wall surface of the saddle, and are fixedly connected through a square storage box provided close to the inner wall of the saddle.

[0010] Further, the inside of the sliding sleeve one is threadedly connected with the outside of the lead screw, and the inside of the sliding sleeve one is provided with an oil leakage hole between the oil distribution port end and the thread recess on the surface of the lead screw.

[0011] Further, the lead screw nut is threadedly connected with the lead screw, and comprises a front nut and a rear nut, with a pre-tightening gasket provided between the front nut and the rear nut and adjacent surfaces of the three abutting, and the lead screw nut is inserted into the inside of the nut seat and fixedly connected therewith.

[0012] Further, one side of the feeding base is fixedly connected with a position feedback mechanism, and the position feedback mechanism and the servo motor are electrically connected with a control mechanism.

[0013] Further, the position feedback mechanism comprises a grating scale head fixedly connected to one side of the saddle, a scale grating fixedly connected to the inside of the bed body in a transverse manner, and a wire one fixedly connected to one side of the grating scale head, the scale grating is arranged below the grating scale head and parallel to the lead screw, and the wire one is used to connect the grating scale head and the CNC controller to transmit the obtained reading to the CNC controller for analysis.

[0014] Further, one side of the scale grating close to the feeding mechanism is provided with a dirt baffle, the dirt baffle is fixedly connected to the inside bottom end of the bed body and used to isolate the splashing dirt to avoid pollution of the scale grating, and the grating stripes of the scale grating are arranged on the side away from the feeding mechanism to further prevent oil pollution, and the vertical section of the dirt baffle is in the shape of "L", with the "L" shaped table top below the position feedback mechanism and used to lay the wire one.

[0015] Further, the space formed by the dirt blocking plate and the inner wall of the bed body is provided with a flow guide groove at the bottom, the flow guide groove is located below the lead screw and the guide rod, and the bottom end is inclined downward from the side end of the servo motor as a starting point.

[0016] Further, the control mechanism comprises a CNC controller for storing, calculating and issuing instructions, the CNC controller is electrically connected with a driver, the driver is used for receiving a low-power instruction signal from the CNC controller, amplifying and converting it into high-power current / voltage, and accurately driving the servo motor, and the electrical connection between the CNC controller and the driver and the driver and the second wire is realized through the second wire.

[0017] The technical effects and advantages of the present application are as follows:

[0018] The base support assembly is provided, which is symmetrically arranged at both ends of the slide saddle, and during the movement of the slide saddle, oil continuously leaks from the oil outlet to the inside of the slide sleeve one and the slide sleeve two to lubricate and cool the contact surfaces of the two and the lead screw and the guide rod, and timely lubricate and cool the intensified friction and heating of the lead screw nut after pre-tightening, which is beneficial to improve the equipment operation efficiency and prolong the service life of the equipment.

[0019] The base support assembly is provided, which provides a high-precision installation reference for the slide saddle, ensures the centering accuracy of the lead screw, the lead screw nut and the nut seat, and ensures the centering effect of the guide rod and the slide sleeve three, and on the other hand, the pair of support assemblies can bear bidirectional axial force, which is beneficial to improve the carrying capacity and stability of the slide saddle. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0021] Figure 2 It is a schematic diagram of the structure of the feeding mechanism of the present application;

[0022] Figure 3 It is a schematic diagram of the internal structure of the feeding base of the present application;

[0023] Figure 4 It is a schematic diagram of the internal structure of the feeding base of the present application;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the base support assembly of the present application;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the base support assembly of the present application;

[0026] Figure 7 It is a schematic diagram of the cross-sectional structure of the base support assembly of the present application.

[0027] The reference signs are: 1, bed body; 11, flow guide groove; 12, dirt blocking plate; 2, feeding mechanism; 21, servo motor; 22, shaft coupling; 23, lead screw; 231, first bearing seat; 24, guide rod; 241, mounting seat; 25, feeding base; 251, slide saddle; 252, base support assembly; 2521, sliding sleeve one; 2522, sliding sleeve two; 2523, storage cavity; 2524, oil distribution port; 2525, oil injection nozzle; 2526, oil leakage port; 253, nut seat; 254, sliding sleeve three; 255, screw nut; 2551, front nut; 2552, rear nut; 256, pre-tightening gasket; 3, position feedback mechanism; 31, grating degree head; 32, scale grating; 33, wire one; 4, control mechanism; 41, CNC controller; 42, driver; 43, wire two. DETAILED DESCRIPTION

[0028] The technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. In addition, the forms of each structure described in the following embodiments are only examples. The feeding device for CNC machine tool machining involved in the present application is not limited to each structure described in the following embodiments. All other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0029] With reference to Figures 1 to 2 The present application provides a feeding device for CNC machine tool machining, comprising a bed body 1, a feeding mechanism 2 is arranged inside the bed body 1, the feeding mechanism 2 comprises a servo motor 21 fixedly connected to one end inside the bed body 1, a shaft coupling 22 coaxially fixedly connected with the output shaft of the servo motor 21, a lead screw 23 fixedly connected with one end of the shaft coupling 22, the lead screw 23 is horizontally arranged inside the bed body 1 and rotatably connected with the inner wall of the bed body 1 through the first bearing seat 231 matched with one end of the lead screw 23, a guide rod 24 is arranged on the same horizontal side of the lead screw 23, the guide rod 24 is fixedly connected with the inner wall of the bed body 1 through the mounting seat 241 matched with both ends of the guide rod 24, and a feeding base 25 is movably connected with the top ends of the lead screw 23 and the guide rod 24.

[0030] One end of the servo motor 21 is fixedly connected with the inner wall of the bed body 1, and the output end is fixedly connected with one end of the shaft coupling 22. After starting, the power of the servo motor 21 is transmitted to the lead screw 23 at the other end of the shaft coupling 22 through the shaft coupling 22, and the rotation connection with the inner wall of the bed body 1 is realized through the first bearing seat 231. The guide rod 24 is horizontally arranged on one side of the lead screw 23, the feeding base 25 is arranged on the lead screw 23 and the guide rod 24, and is threadedly connected with the lead screw 23 and slidably connected with the guide rod 24. The feeding base 25 drives the lead screw 23 to rotate through the servo motor 21 to realize the linear motion inside the bed body 1 along the guide rod 24.

[0031] With reference to Figure 3 and Figure 4 , the feeding base 25 comprises a slide saddle 251 for carrying the moving part, a base support assembly 252 provided at both ends of the slide saddle 251 and matched with the lead screw 23 and the guide rod 24, a nut seat 253 and a sliding sleeve three 254 provided inside the slide saddle 251 and fixedly connected with the same, and a screw nut 255 provided inside the nut seat 253 and matched with the lead screw 23.

[0032] A preferred embodiment of the present application is that the nut seat 253 and the sliding sleeve three 254 are fixedly connected on the same mounting plate, which is fixedly connected with the inner wall of the slide saddle 251 through screws, the screw nut 255 is axially fixed inside the nut seat 253, and the guide rod 24 is axially provided inside the sliding sleeve three 254.

[0033] During the linear motion of the slide saddle 251 along the guide rod 24, the travel power of the slide saddle 251 comes from the rotation of the lead screw 23, the lead screw 23 is processed with a precision spiral raceway, the screw nut 255 is internally provided with circulating balls, and when the lead screw 23 rotates, the balls roll between the raceways of the lead screw 23 and the screw nut 255, at this time, the rotational motion of the lead screw 23 is converted into the linear motion of the screw nut 255, the guide rod 24 assists to bear the weight of the slide saddle 251 and ensures the high-precision and smooth linear reciprocating motion of the slide saddle 251 along a straight line.

[0034] With reference to Figure 3 and Figure 5 , the base support assembly 252 comprises a sliding sleeve one 2521 and a sliding sleeve two 2522 which are respectively penetrated by the lead screw 23 and the guide rod 24 and movably connected with the same, a storage cavity 2523 which is opened inside the base support assembly 252 and communicated with the interiors of the sliding sleeve one 2521 and the sliding sleeve two 2522, and an oil injection nozzle 2525 which is fixedly connected on the side of the base support assembly 252 close to the inner wall of the slide saddle 251, and the base support assembly 252 is symmetrically provided at both ends of the slide saddle 251.

[0035] The base support assembly 252 provides a high-precision installation reference for the slide saddle 251, so that the lead screw 23, the screw nut 255 and the nut seat 253 are well centered, and the guide rod 24 and the sliding sleeve three 254 are well centered, and on the other hand, the base support assembly 252 is provided in pairs to bear bidirectional axial force, which further improves the carrying capacity and stability of the slide saddle 251.

[0036] With reference to Figure 3 and Figure 7, the sleeve one 2521 and the sleeve two 2522 are cylindrical, the end face of the sleeve one 2521 and the sleeve two 2522 close to the outer part of the slide saddle 251 is flush with the outer wall surface of the slide saddle 251, the sleeve one 2521 and the sleeve two 2522 are fixedly connected through the square storage box arranged close to the inner wall of the slide saddle 251, the storage cavity 2523 is arranged in the inside of the storage box, the connecting position of the storage cavity 2523 with the sleeve one 2521 and the sleeve two 2522 is provided with a tapered oil distribution port 2524, the storage cavity 2523 is communicated with the inside of the sleeve one 2521 and the sleeve two 2522 through the oil distribution port 2524, the inside of the storage cavity 2523 is communicated with the inside of the oil injection nozzle 2525, and the oil injection nozzle 2525 is arranged on one side of the square storage box and penetrates the slide saddle 251.

[0037] The storage cavity 2523 in the base support assembly 252 can be conveniently injected with lubricating oil through the oil injection nozzle 2525, and the oil can lubricate the contact surfaces of the lead screw 23 and the guide rod 24 and the sleeve one 2521 and the sleeve two 2522 through the oil distribution port 2524 during the linear motion of the slide saddle 251 along the lead screw 23 and the guide rod 24, effectively reducing the friction of the sleeve one 2521 and the sleeve two 2522 on the lead screw 23 and the guide rod 24, prolonging the service life, and ensuring the high precision and stability of the slide saddle 251 during linear motion. In addition, the base support assembly 252 is arranged in pairs, so that it can effectively bear the axial force from both directions.

[0038] Referring to Figure 5 and Figure 7 In the preferred embodiment of the present application, lubricating oil is stored in the storage cavity 2523, and the lubricating oil is dispersed into the inside of the sleeve one 2521 and the sleeve two 2522 along the oil distribution port 2524 during the linear motion of the base support assembly 252 along the lead screw 23 and the guide rod 24, forming an oil film between the lead screw 23 and the sleeve one 2521 and between the guide rod 24 and the sleeve two 2522, reducing friction and wear. The inside of the sleeve one 2521 is threadedly connected with the outside of the lead screw 23, and the inside of the sleeve one 2521 is provided with an oil leakage port 2526 between the end of the oil distribution port 2524 and the thread recess on the surface of the lead screw 23, so that the oil can quickly infiltrate the surface threads of the lead screw 23 from the oil leakage port 2526 to lubricate the lead screw 23.

[0039] It is worth noting that the present application is Figure 5 The base support assembly 252 is inverted, and in the normal state, the storage cavity 2523 is located above the sleeve one 2521 and the sleeve two 2522, and the oil will continuously leak out from the oil distribution port 2524 to the inside of the sleeve one 2521 and the sleeve two 2522 to lubricate the contact surfaces of the two with the lead screw 23 and the guide rod 24, and timely lubricate and cool the intensified friction and heat after the lead screw nut is pre-tightened.

[0040] The screw nut 255 is in threaded connection with the screw rod 23, and the screw nut 255 comprises a front nut 2551 and a rear nut 2552, and a pre-tightening gasket 256 is arranged between the front nut 2551 and the rear nut 2552, and the adjacent surfaces of the three are attached, the screw nut 255 is inserted into the interior of the nut seat 253, and the two are fixedly connected.

[0041] In the threaded transmission between the screw rod 23 and the screw nut 255, there is a play between the threads of the screw nut 255 and the screw rod 23, and the play will cause unnecessary shaking or errors of the feeding mechanism 2 during operation. In order to solve this problem, the double-nut gasket pre-tightening mode is adopted, the front nut 2551 and the rear nut 2552 are arranged, and the pre-tightening gasket 256 is arranged between the two, and by adjusting the thickness of the pre-tightening gasket 256, the front nut 2551 and the rear nut 2552 can generate appropriate pre-tightening force on the screw rod 23, thereby effectively reducing or even eliminating the play between the threads, improving the stability of the feeding mechanism 2, and also improving the machining precision and efficiency.

[0042] Referring to Figure 1 , one side of the feeding base 25 is fixedly connected with a position feedback mechanism 3, and the position feedback mechanism 3 and the servo motor 21 are electrically connected with a control mechanism 4.

[0043] Referring to Figure 2 , the control mechanism 4 comprises a CNC controller 41 for storing, calculating and issuing instructions, and the CNC controller 41 is electrically connected with a driver 42, and the driver 42 is used for receiving a low-power instruction signal from the CNC controller 41, and amplifying and converting it into a high-power current to accurately drive the servo motor 21, and the electrical connection between the CNC controller 41 and the driver 42 and the electrical connection between the driver 42 and the second wire 43 are realized through the second wire 43.

[0044] The operator inputs the machining program into the CNC controller 41 through the operation panel externally assembled with the CNC controller 41, the CNC controller 41 analyzes the program to generate instructions and sends them to the driver 42, the driver 42 outputs a high-power current to the servo motor 21 after receiving the instruction signal, and drives the servo motor 21 to rotate.

[0045] Referring to Figure 2 , the position feedback mechanism 3 comprises a grating scale head 31 fixedly connected to one side of the slide saddle 251, a scale grating 32 fixedly connected transversely in the interior of the bed body 1, and a first wire 33 fixedly connected to one side of the grating scale head 31, the scale grating 32 is arranged below the grating scale head 31 and is parallel to the screw rod 23, and the first wire 33 is used for connecting the grating scale head 31 and the CNC controller 41 to transmit the obtained reading to the CNC controller 41 for analysis.

[0046] The traditional method sprays lubricating oil liquid to the lead screw 23 and the machining tool and the workpiece cutting surface through the nozzle, and the splashed oil droplets may contaminate the scale grating 32, causing the reading of the grating scale 31 to be disturbed, thereby affecting the feedback accuracy. To solve this problem, a dirt blocking plate 12 (see Figure 6 ) is arranged on the side close to the feeding mechanism 2, the dirt blocking plate 12 is fixedly connected to the inner bottom end of the bed body 1, and is used for isolating the splashed oil dirt to avoid contaminating the scale grating 32, and the grating stripes of the scale grating 32 are arranged on the side away from the feeding mechanism 2, further preventing oil dirt contamination, and the vertical section of the dirt blocking plate 12 is in the shape of “L”, the “L” shaped table top is located below the position feedback mechanism 3, and can be used for laying the wire one 33, while preventing the wire one 33 from being contaminated by oil dirt.

[0047] In addition, a flow guide groove 11 is formed at the bottom of the space between the dirt blocking plate 12 and the inner wall of the bed body 1, the flow guide groove 11 is located below the lead screw 23 and the guide rod 24, and the bottom end thereof is inclined downward from the side end of the servo motor 21 as a starting point, so that the oil liquid for lubrication and cooling collected at the bottom of the bed body 1 is guided to one side of the bed body 1 along the flow guide groove 11 after dropping from the lead screw 23 and the guide rod 24, which avoids the accumulation of oil liquid at the bottom of the machine tool, and maintains the cleanliness and dryness of the inside of the machine tool. A flow guide opening is formed at the flow guide groove 11 of the inner wall of the bed body 1, and is connected to a recovery pipeline to recover and process the oil liquid.

[0048] Working principle of the present application:

[0049] Working principle of the control device: The control mechanism 4 includes a CNC controller 41 and a driver 42, the driver 42 is a key bridge between the control mechanism 4 and the servo motor 21, and is responsible for amplifying the control signal and effectively driving the motor to operate. The feeding mechanism 2 is an important execution unit receiving instructions from the control mechanism 4. When the driver 42 receives the accurate control signal sent by the CNC controller 41, the servo motor 21 is started to drive the lead screw 23 to rotate, and the rotary motion is converted into linear motion through the screw nut 255, so as to drive the slide block 251 to move linearly. The grating scale 31 installed on one side of the slide block 251 and the scale grating 32 installed below the grating scale 31 directly measure the actual displacement of the linear motion of the slide block 251, and feed the measurement data to the CNC controller 41 through the wire one 33, the CNC controller 41 calculates the error between the actual position and the instruction position, generates a compensation instruction according to the error, and drives the feeding mechanism 2 to move through the driver 42 to eliminate the error, so as to realize full closed loop control, thereby ensuring that the entire control device can continuously, stably and accurately operate.

[0050] It should be noted that in the description of the present application, the terms "front", "back", "left", "right", "up", "down", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and not requiring the present application to be necessarily constructed and operated in a particular orientation, and therefore should not be understood as a limitation on the present application. The terms "front", "back", "left", "right", "up", "down" used in the description of the present application refer to the directions in the drawings, and the terms "inner", "outer" refer to the directions towards or away from the geometric center of a particular component.

[0051] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A feeding device for CNC machine tool machining, comprising a bed body (1), characterized in that, The inside of the bed body (1) is provided with a feeding mechanism (2), the feeding mechanism (2) includes a servo motor (21) fixedly connected to one end of the inside of the bed body (1), a shaft coupling (22) fixedly connected coaxially with the output shaft of the servo motor (21), and a lead screw (23) fixedly connected to one end of the shaft coupling (22), wherein the lead screw (23) is horizontally arranged in the inside of the bed body (1) and rotatably connected to the inner wall of the bed body (1) through a first bearing seat (231) adapted to one end of the lead screw (23), and a guide rod (24) is arranged on the same horizontal side of the lead screw (23) and fixedly connected to the inner wall of the bed body (1) through mounting seats (241) adapted to both ends of the guide rod (24), and a feeding base (25) is movably connected to the top ends of the lead screw (23) and the guide rod (24). The feeding base (25) includes a slide saddle (251) for bearing moving parts, base support assemblies (252) arranged at both ends of the slide saddle (251) and adapted to the lead screw (23) and the guide rod (24), a nut seat (253) and a sliding sleeve three (254) arranged in the inside of the slide saddle (251) and fixedly connected thereto, and a lead screw nut (255) arranged in the inside of the nut seat (253) and adapted to the lead screw (23), wherein the base support assemblies (252) include sliding sleeves one (2521) and two (2522) penetrated by the lead screw (23) and the guide rod (24) and movably connected thereto, a storage cavity (2523) opened in the inside of the base support assemblies (252) and communicated with the interiors of the sliding sleeves one (2521) and two (2522), and an oil injection nozzle (2525) fixedly connected to one side of the base support assemblies (252) close to the inner wall of the slide saddle (251). The base support assemblies (252) are symmetrically arranged at both ends of the slide saddle (251), and the sliding sleeves one (2521) and two (2522) are cylindrical, the end faces of which close to the outside of the slide saddle (251) are flush with the outer wall surface of the slide saddle (251), the sliding sleeves one (2521) and two (2522) are fixedly connected through a square storage box arranged close to the inner wall of the slide saddle (251), the storage cavity (2523) is opened in the inside of the storage box, a tapered oil distribution port (2524) is opened at the connection position of the storage cavity (2523) and the sliding sleeves one (2521) and two (2522), the storage cavity (2523) is communicated with the interiors of the sliding sleeves one (2521) and two (2522) through the oil distribution port (2524), the interior of the storage cavity (2523) is communicated with the interior of the oil injection nozzle (2525), and the oil injection nozzle (2525) is penetrated through the slide saddle (251) and arranged on one side of the square storage box.

2. The feeding device for CNC machine tool machining according to claim 1, characterized in that: The interior of the sliding sleeve one (2521) is threadedly connected with the outside of the lead screw (23), and an oil leakage port (2526) is opened between the end of the oil distribution port (2524) in the interior of the sliding sleeve one (2521) and the thread recess on the surface of the lead screw (23).

3. The feeding device for CNC machine tool machining according to claim 1, characterized in that: The screw nut (255) is in threaded connection with the screw rod (23), the screw nut (255) comprises a front nut (2551) and a rear nut (2552), a pre-tightening washer (256) is arranged between the front nut (2551) and the rear nut (2552), and the adjacent surfaces of the three are attached, the screw nut (255) is inserted into the inside of the nut seat (253), and the two are fixedly connected.

4. The feeding device for CNC machine tool machining according to claim 1, characterized in that: One side of the feeding base (25) is fixedly connected with a position feedback mechanism (3), and the position feedback mechanism (3) and the servo motor (21) are electrically connected with a control mechanism (4).

5. A feed device for CNC machine tool machining according to claim 4, characterized in that: The position feedback mechanism (3) comprises a grating scale head (31) fixedly connected to one side of the slide saddle (251), a scale grating (32) fixedly connected transversely in the inside of the bed body (1), and a wire one (33) fixedly connected to one side of the grating scale head (31), the scale grating (32) is arranged below the grating scale head (31) and is parallel to the screw rod (23), and the wire one (33) is used for connecting the grating scale head (31) and the CNC controller (41) and transmitting the obtained reading to the CNC controller (41) for analysis.

6. A feed device for CNC machine tool machining according to claim 5, characterized in that: The scale grating (32) is provided with a dirt baffle (12) on the side close to the feeding mechanism (2), the dirt baffle (12) is fixedly connected to the inside bottom end of the bed body (1) and is used for isolating splashed oil stains, and the grating stripes of the scale grating (32) are arranged on the side away from the feeding mechanism (2), the vertical section of the dirt baffle (12) is in the shape of "L", the "L" shaped table top is below the position feedback mechanism (3) and can be used for laying the wire one (33).

7. A feed device for CNC machine tool machining according to claim 6, characterized in that: The space formed by the dirt baffle (12) and the inner wall of the bed body (1) is provided with a flow guide groove (11) at the bottom, the flow guide groove (11) is below the screw rod (23) and the guide rod (24), and the bottom end is taken as the starting point of the side end of the servo motor (21) and is inclined downward to the opposite side.

8. The feed device for CNC machine tool machining according to claim 4, characterized in that: The control mechanism (4) comprises a CNC controller (41) used for storing, calculating and issuing instructions, the CNC controller (41) is electrically connected with a driver (42), the driver (42) is used for receiving a low-power instruction signal from the CNC controller (41), amplifying and converting the low-power instruction signal into high-power current / voltage, and accurately driving the servo motor (21), and the electrical connection between the CNC controller (41) and the driver (42) and between the driver (42) and a wire two (43) is realized through the wire two (43).

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