Machine head of numerical control tool sharpener

Abstract

The utility model provides a numerical control tool sharpener machine head, including polishing mechanism and machine head base, polishing mechanism includes the polishing base that is provided on the machine head base, the bottom of polishing base is provided with the waterproof frame, the space that the waterproof frame encloses is provided with two unthreaded shaft guide rails in parallel at interval, the bottom of polishing base is connected with the screw nut, and the screw nut is connected with the machine head base. A sliding hole is formed in the top of the machine head base, the top of the machine head base is arranged in the space defined by the waterproof frame and is in sliding connection with the optical axis guide rail through the sliding hole, an avoiding hole is formed in the rear portion of the machine head base, and the output end of the second motor penetrates through the avoiding hole; one end of the lead screw is connected with the output end of the second motor through a transmission mechanism, the waterproof frame is provided with an avoiding opening, and the avoiding opening is arranged to allow the second motor to pass through. The utility model has the advantages that the polished shaft guide rail, the screw rod and the sliding hole are positioned in the space enclosed by the waterproof frame and cannot be sprayed by cooling water, the lubricating effect of parts is not influenced by the cooling water, frequent maintenance is not needed, and the maintenance cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerical control grinding, and more specifically, particularly relates to a head of a numerical control knife grinder. Background Art

[0002] When processing workpieces, CNC tool grinders need to use a water spraying system to cool the grinding position of the workpiece to reduce the temperature of the workpiece. If the transmission mechanism of the CNC tool grinder head is sprayed with cooling water for a long time, it will affect the lubrication effect of the transmission parts and increase maintenance costs.

[0003] For example, the patent number applied for by this enterprise is 202111115692.0, and the invention name is a Chinese invention patent for an adaptive multi-axis multifunctional CNC double-sided grinder, which includes a grinding base, a grinding mechanism, a feeding mechanism, a servo lifting mechanism and a fixing mechanism. The two grinding bases are symmetrically distributed, and a grinding mechanism is arranged on the grinding base. A feeding mechanism is arranged between the two grinding bases, and a servo lifting mechanism is fixed above the feeding mechanism. A fixing mechanism is arranged on the servo lifting mechanism. The grinding base includes a base, a turntable is arranged on the upper surface of the base, an adjustment base is arranged on the turntable, and a number of screws are symmetrically distributed on both sides of the adjustment base. Two symmetrically distributed fixing plates are fixed on the upper surface of the adjustment base, and a first motor is arranged on the outer side of the fixing plate. Two symmetrically distributed light rods are arranged between the two fixing plates, and a first lead screw is arranged between the two light rods. The first lead screw is rotatably connected to the fixing plate, and the output end of the first motor is fixedly connected to the first lead screw.

[0004] The grinding mechanism includes a grinder base arranged above the grinding base, two groups of symmetrically distributed first sliding sleeves are arranged on both sides of the bottom surface of the grinder base, the first sliding sleeves cooperate with the polished rod, two first nuts are arranged in the middle of the bottom surface of the grinder base, the first nut and the first lead screw form a lead screw pair, a motor support platform is arranged on the upper surface of the grinder base, two rotating seats are arranged on the side of the motor support platform close to the first motor, the rotating seat is rotatably connected to a motor mounting plate, a motor is fixed on the motor mounting plate, a driving pulley is fixed to the output end of the motor, a belt is arranged on the driving pulley, a driven pulley is arranged at the end of the belt away from the driving pulley, the driven pulley is connected to the power output end of the grinder base, an output end is arranged on the side of the grinder base away from the driven pulley, and a grinding wheel is connected to the end of the output end.

[0005] The shortcoming of the above technical solution is that when the grinding mechanism slides relative to the adjusting base through the two polished rods and the first screw rod, the two polished rods and the first screw rod are exposed to the outside and will be sprayed with cooling water. The two polished rods and the first screw rod are sprayed with cooling water for a long time, and the lubricating oil attached to the two polished rods and the first screw rod is consumed quickly, requiring frequent maintenance and having high maintenance costs. Summary of the invention

[0006] The invention of the utility model aims to solve the above-mentioned technical problems and to provide a CNC knife sharpening machine head with good waterproof effect and low maintenance cost.

[0007] The utility model is achieved through the following technical solutions.

[0008] The utility model provides a head of a numerically controlled knife sharpening machine, comprising a grinding mechanism and a head base, the grinding mechanism comprising a grinding base arranged on the head base, a first motor being arranged on the top of the grinding base, a driving pulley being connected to the output end of the first motor, a belt being arranged on the driving pulley, a driven pulley being arranged at one end of the belt away from the driving pulley, the driven pulley being connected to one end of a transmission shaft, a grinding wheel being connected to the other end of the transmission shaft, a waterproof frame being arranged at the bottom of the grinding base, the waterproof frame comprising a front frame plate, a rear frame plate, a left frame plate and a right frame plate, two optical axis guide rails being arranged in parallel at intervals in the space enclosed by the waterproof frame, the front end and the rear end of the optical axis guide rail being arranged at the same time. They are respectively connected and fixed with the front frame plate and the rear frame plate, the bottom of the grinding base is connected with a lead screw nut at a position between the two optical axis guide rails, the top of the head base is provided with a sliding hole at a position corresponding to the optical axis guide rail, the top of the head base is placed in the space surrounded by the waterproof frame and is slidably connected with the optical axis guide rail through the sliding hole, the rear part of the head base is provided with a avoidance hole, the output end of the second motor arranged on the outer side of the rear part of the head base is arranged through the avoidance hole, the lead screw nut is threadedly connected with a lead screw, one end of the lead screw is connected to the output end of the second motor through a transmission mechanism, and the rear frame plate is provided with a avoidance opening at a position between the two optical axis guide rails, and the avoidance opening is arranged to allow the second motor to pass through.

[0009] In the above technical scheme, the optical axis guide rail and the screw rod are located in the space surrounded by the waterproof frame, and the top of the machine head base that slides with the optical axis guide rail is also located in the space surrounded by the waterproof frame. When the grinding base slides back and forth relative to the machine head base, the cooling water is blocked by the waterproof frame when spraying on the grinding base and will not be sprayed on the optical axis guide rail, the screw rod and the sliding hole. The cooling water will not affect the lubrication effect of the screw rod and the screw rod nut, nor will it affect the lubrication effect of the optical axis guide rail and the machine head base sliding together. It does not require frequent maintenance and has low maintenance costs.

[0010] Preferably, the sliding hole is a stepped hole, including an outer hole and an inner hole that are interconnected, the aperture of the inner hole matches the outer diameter of the optical axis guide rail, the aperture of the outer hole is larger than the aperture of the inner hole, two guide rail copper sleeves are arranged in the outer hole, an oil-absorbing sponge ring is arranged between the two guide rail copper sleeves, the inner diameter of the guide rail copper sleeve and the inner diameter of the oil-absorbing sponge ring both match the outer diameter of the optical axis guide rail and are mounted on the optical axis guide rail, a pressure ring is arranged on the outside of the outer hole, the aperture of the pressure ring matches the outer diameter of the optical axis guide rail and is connected and fixed to the head base in a detachable manner. In this technical solution, by arranging the guide rail copper sleeve and the oil-absorbing sponge ring in the sliding hole, the oil-absorbing sponge ring has good oil absorption performance, which can extend the lubrication time of the sliding hole and the optical axis guide rail, reduce the maintenance frequency, and reduce the maintenance cost.

[0011] Preferably, the screw nut includes an integrally formed nut portion and a connecting portion, the nut portion is threadedly connected to the screw, a connecting block is integrally formed at the bottom of the grinding base, the connecting block is provided with a mounting hole, the nut portion is arranged through the mounting hole, and the connecting portion is connected and fixed to the connecting block by a detachable connection. In this technical solution, the screw nut adopts an independent split design, and is connected to the grinding base by a detachable connection. It can be made of high-strength materials, which can increase the service life while reducing the manufacturing cost, and is also convenient to replace after damage.

[0012] Preferably, the transmission mechanism includes a bearing seat and a coupling, the bearing seat is fixed at a position corresponding to the avoidance hole on the inner side of the rear portion of the machine head base, a screw hole is provided on the side of the bearing seat facing the screw, one end of the screw passes through the screw hole and is connected to the output end of the coupling provided in the bearing seat, and the input end of the coupling is connected to the output end of the second motor. In this technical solution, by providing a bearing seat and a coupling, the connection between the screw and the output end of the second motor is facilitated.

[0013] Preferably, one end of the screw rod passing through the screw rod hole is sequentially provided with a bearing cover, a bearing, a bearing washer and a tightening nut from the side away from the bearing seat to the side close to the bearing seat, and the bearing, bearing washer and tightening nut are all located in the bearing seat, and the bearing cover is arranged on the outside of the bearing seat and is connected and fixed to the bearing seat in a detachable manner. In this technical solution, the bearing reduces the friction between the screw rod and the bearing seat, reduces friction loss and increases service life, and the position of the bearing can be limited to always be located in the screw rod hole and cooperate with the bearing seat through the cooperation of the bearing cover and the tightening nut.

[0014] Preferably, the coupling is a plum blossom coupling. In this technical solution, the plum blossom coupling has a simple structure, does not require lubrication, is easy to repair, easy to check, maintenance-free, and can operate continuously for a long time.

[0015] Preferably, a motor cover is provided outside the second motor, and the avoidance opening is configured to allow the motor cover to pass through. In this technical solution, the motor cover can achieve waterproof and dustproof effects.

[0016] Preferably, the second motor is a servo motor. In the present technical solution, the servo motor can control the speed, the position accuracy is very accurate, and the voltage signal can be converted into torque and speed to drive the control object. The rotor speed of the servo motor is controlled by the input signal and can respond quickly. In the automatic control system, it is used as an actuator and has the characteristics of small electromechanical time constant and high linearity. It can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft.

[0017] Preferably, the first motor is connected to the grinding base through a motor support platform, the motor support platform includes a fixing plate and a motor mounting plate, the rear side of the fixing plate and the rear side of the motor mounting plate are hinged, the first motor is fixed to the top surface of the motor mounting plate, and the front bottom surface of the motor mounting plate is connected with a height adjustment mechanism. In this technical solution, the belt will become loose after long-term use, and the height of the first motor can be adjusted through the height adjustment mechanism, thereby adjusting the tightness of the belt to make the equipment operate normally.

[0018] Preferably, the height adjustment mechanism includes an articulated seat, a telescopic rod and an adjusting hydraulic cylinder, the articulated seat is fixed to the bottom surface of the motor mounting plate near the front side, the top end of the telescopic rod is hinged to the articulated seat, the bottom end of the telescopic rod is connected to the output end of the adjusting hydraulic cylinder, and the adjusting hydraulic cylinder is connected and fixed to the grinding base. In this technical solution, the structure is simple, and the height of the motor mounting plate can be raised and lowered by adjusting the hydraulic cylinder to control the telescopic rod to move upward and downward, thereby realizing the height adjustment of the first motor.

[0019] The utility model has the advantages of good waterproof effect, the optical axis guide rail and the screw rod are located in the space surrounded by the waterproof frame, and the top of the machine head base that slides with the optical axis guide rail is also located in the space surrounded by the waterproof frame. When the cooling water is sprayed onto the grinding base, it is blocked by the waterproof frame and will not be sprayed onto the optical axis guide rail, the screw rod and the sliding hole. The cooling water will not affect the lubrication effect of the screw rod and the screw rod nut, nor will it affect the lubrication effect of the optical axis guide rail and the machine head base sliding together. It does not require frequent maintenance and has low maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the exploded structure of the utility model;

[0022] Figure 3 It is a schematic diagram of the structure of the bottom direction of the grinding base of the utility model;

[0023] Figure 4 It is a structural schematic diagram of the head base of the utility model;

[0024] Figure 5 The schematic diagram of the structure of the head base and the optical axis guide rail of the utility model Figure 1 ;

[0025] Figure 6 The schematic diagram of the structure of the head base and the optical axis guide rail of the utility model Figure 2 ;

[0026] Figure 7 for Figure 6 A partial enlarged schematic diagram of part A;

[0027] Figure 8 This is a schematic diagram of the exploded structure of the connection between the screw rod and the second motor of the utility model;

[0028] Fig. 9 This is a structural schematic diagram of the motor support platform of the utility model;

[0029] Fig.10 It is a schematic diagram of the utility model being applied to a CNC knife sharpening machine. DETAILED DESCRIPTION

[0030] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0033] Example 1

[0034] The utility model provides a CNC knife sharpening machine head, such as Figures 1 to 4 As shown, it includes a grinding mechanism 2 and a head base 1, the grinding mechanism 2 includes a grinding base 21 arranged on the head base 1, a first motor 23 is arranged on the top of the grinding base 21, the output end of the first motor 23 is connected to a driving pulley 24, the driving pulley 24 is provided with a belt 25, the end of the belt 25 away from the driving pulley 24 is provided with a driven pulley 26, the driven pulley 26 is connected to one end of a transmission shaft 27, the other end of the transmission shaft 27 is connected with a grinding wheel 28, the bottom of the grinding base 21 is provided with a waterproof frame 3, the waterproof frame 3 includes a front frame plate, a rear frame plate, a left frame plate and a right frame plate, two optical axis guide rails 4 are arranged in parallel at intervals in the space surrounded by the waterproof frame 3, the front end and the rear end of the optical axis guide rail 4 are respectively connected and fixed to the front frame plate and the rear frame plate, in order to better fix the optical axis guide rail 4, the bottom of the grinding base 21 is also provided with an intermediate plate 212 between the front frame plate and the rear frame plate, and the optical axis guide rail 4 is arranged through the intermediate plate 212. The bottom of the grinding base 21 is connected with a screw nut 5 at a position between the two optical axis guide rails 4, and the top of the head base 1 is provided with a sliding hole 11 at a position corresponding to the optical axis guide rail 4. The top of the head base 1 is placed in the space surrounded by the waterproof frame 3 and is slidably connected with the optical axis guide rail 4 through the sliding hole 11. Specifically, the length of the top of the head base 1 is less than the distance between the inner wall of the front frame plate and the inner wall of the rear frame plate. The length of the top of the head base 1 is approximately one-half of the distance between the inner wall of the front frame plate and the inner wall of the rear frame plate. This can be set according to the specific stroke that the grinding base 21 needs to move. In this way, when the head base 1 is fixed, the grinding base 21 has space to move relative to the head base 1 in the direction of the optical axis guide rail 4, and the width of the top of the head base 1 is slightly smaller than the distance between the inner wall of the left frame plate and the inner wall of the right frame plate, so that the top of the head base 1 can be placed in the space surrounded by the waterproof frame 3. An avoidance hole 12 is provided at the rear of the machine head base 1, and the output end of the second motor 8 arranged on the outer side of the rear of the machine head base 1 is arranged through the avoidance hole 12, and a screw 6 is threadedly connected to the screw nut 5, and one end of the screw 6 is connected to the output end of the second motor 8 through a transmission mechanism, wherein the second motor 8 is a servo motor, and a motor cover 81 is provided outside the second motor 8, and the rear frame plate is provided with an avoidance opening 31 at a position between the two optical axis guide rails 4, and the avoidance opening 31 is configured to allow the second motor 8 and the motor cover 81 to pass through, so that when the grinding base 21 slides relative to the machine head base 1, the waterproof frame 3.

[0035] like Figure 4 As shown, there are four sliding holes 11, one symmetrically provided at the front and rear of the left side of the machine head base 1, and one symmetrically provided at the front and rear of the right side. In this way, the two sliding holes 11 on the same side slide in cooperation with an optical axis guide rail 4 on the corresponding side, and the grinding base 21 is more stable relative to the machine head base 1.

[0036] like Figures 5 to 7 As shown, as a further improvement, the sliding hole 11 is a stepped hole, including an outer hole and an inner hole that are connected to each other, the aperture of the inner hole matches the outer diameter of the optical axis guide rail 4, the aperture of the outer hole is larger than the aperture of the inner hole, two guide rail copper sleeves 41 are arranged in the outer hole, and an oil-absorbing sponge ring 42 is arranged between the two guide rail copper sleeves 41. The oil-absorbing sponge ring 42 has good oil absorption performance and can extend the lubrication time of the sliding hole 11 and the optical axis guide rail 4. The inner diameter of the guide rail copper sleeve 41 and the inner diameter of the oil-absorbing sponge ring 42 are matched with the outer diameter of the optical axis guide rail 4 and are mounted on the optical axis guide rail 4. A pressing ring 43 is provided on the outside of the outer hole, and the aperture of the pressing ring 43 matches the outer diameter of the optical axis guide rail 4 and is connected and fixed to the head base 1 in a detachable manner. In this embodiment, the pressing ring 43 is connected and fixed to the head base 1 by screws.

[0037] like Figure 5 As shown, in this embodiment, the transmission mechanism includes a bearing seat 7 and a coupling 9, the bearing seat 7 is fixed on the inner side of the rear part of the head base 1 at a position corresponding to the avoidance hole 12, the bearing seat 7 is provided with a screw hole on the side facing the screw 6, one end of the screw 6 passes through the screw hole and is connected to the output end of the coupling 9 arranged in the bearing seat 7, the input end of the coupling 9 is connected to the output end of the second motor 8, wherein the coupling 9 adopts a plum blossom coupling, so that the structure is simple, no lubrication is required, maintenance is convenient, inspection is convenient, maintenance-free, and continuous long-term operation can be achieved.

[0038] like Figure 8 As shown, as a further improvement, one end of the screw rod 6 passing through the screw rod hole is sequentially provided with a bearing cover 71, a bearing 72, a bearing washer 73 and a tightening nut 74 from the side away from the bearing seat 7 to the side close to the bearing seat 7. The bearing 72, the bearing washer 73 and the tightening nut 74 are all located in the bearing seat 7. The bearing cover 71 is arranged on the outer side of the bearing seat 7 and is connected and fixed to the bearing seat 7 in a detachable manner. In this embodiment, the bearing cover 71 is connected and fixed to the bearing seat 7 by screws.

[0039] like Fig.10 As shown, the CNC knife sharpener shown in the figure includes two sets of CNC knife sharpener heads of the utility model, and the two sets of CNC knife sharpener heads are symmetrically installed on the frame of the CNC knife sharpener. When the screw rod 6 rotates, the screw nut 5 will move forward or backward along the screw rod 6, so that the grinding base 21 moves forward or backward relative to the head base 1, so as to achieve grinding of the workpiece close to the workpiece, or end grinding away from the workpiece.

[0040] Example 2

[0041] The structure of this embodiment is similar to that of embodiment 1, except that Figure 3 and Figure 6As shown, the screw nut 5 includes an integrally formed nut portion 51 and a connecting portion 52, the nut portion 51 is threadedly connected to the screw 6, the bottom of the polishing base 21 is integrally formed with a connecting block 211, the connecting block 211 is provided with a mounting hole, the nut portion 51 is arranged through the mounting hole, and the connecting portion 52 is connected and fixed to the connecting block 211 in a detachable manner. In this embodiment, the connecting portion 52 is connected and fixed to the connecting block 211 by screws. The screw nut 5 adopts an independent split design relative to the polishing base 21, and is connected to the polishing base 21 in a detachable manner. It can be made of high-strength materials, which can increase the service life while reducing the overall manufacturing cost, and is also convenient to replace after damage.

[0042] Example 3

[0043] The structure of this embodiment is similar to that of embodiment 2, except that: Figure 1 and Fig. 9 As shown, the first motor 23 is connected to the grinding base 21 through a motor support platform 22, and the motor support platform 22 includes a fixed plate 221 and a motor mounting plate 222, and the rear side of the fixed plate 221 and the rear side of the motor mounting plate 222 are hinged, so that when the fixed plate 221 and the grinding base 21 are fixed, the motor mounting plate 222 can be flipped up and down and rotated relative to the fixed plate 221. The first motor 23 is fixed on the top surface of the motor mounting plate 222, and the front bottom surface of the motor mounting plate 222 is connected to a height adjustment mechanism. In the present embodiment, the height adjustment mechanism includes an articulated seat 2221, a telescopic rod 223 and an adjusting hydraulic cylinder (not shown in the figure). The articulated seat 2221 is fixed on the bottom surface of the motor mounting plate 222 near the front side, the top end of the telescopic rod 223 is hinged to the articulated seat 2221, and the bottom end of the telescopic rod 223 is connected to the output end of the adjusting hydraulic cylinder. The adjusting hydraulic cylinder is connected and fixed to the grinding base 21. By controlling the telescopic rod 223 to move upward and downward by adjusting the hydraulic cylinder, the height of the motor mounting plate 222 can be lifted and lowered, thereby realizing the height adjustment of the first motor 23.

[0044] The above are only specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using the concept of the present invention fall within the protection scope of the present invention.

Claims

1. A CNC knife sharpening machine head, comprising a grinding mechanism and a head base, wherein the grinding mechanism comprises a grinding base (21) arranged on the head base (1), a first motor (23) is arranged on the top of the grinding base (21), an output end of the first motor (23) is connected to a driving pulley (24), a belt (25) is arranged on the driving pulley (24), a driven pulley (26) is arranged at one end of the belt (25) away from the driving pulley (24), the driven pulley (26) is connected to one end of a transmission shaft, and a grinding wheel (27) is connected to the other end of the transmission shaft, characterized in that: The bottom of the polishing base (21) is provided with a waterproof frame (3), and the waterproof frame (3) includes a front frame plate, a rear frame plate, a left frame plate and a right frame plate. Two optical axis guide rails (4) are arranged in parallel and at intervals in the space surrounded by the waterproof frame (3). The front end and the rear end of the optical axis guide rail (4) are respectively connected and fixed to the front frame plate and the rear frame plate. The bottom of the polishing base (21) is connected with a lead screw nut (5) at a position between the two optical axis guide rails (4). The top of the machine head base (1) is provided with a sliding hole (11) at a position corresponding to the optical axis guide rail (4). The top of the machine head base (1) is placed in the space surrounded by the waterproof frame (3). The machine head base (1) is provided with a relief hole (12) at the rear of the machine head base (1), and the output end of the second motor (8) arranged on the outer side of the rear of the machine head base (1) passes through the relief hole (12). The lead screw nut (5) is threadedly connected with a lead screw (6) arranged in the same direction as the optical axis guide rail (4), and one end of the lead screw (6) is connected to the output end of the second motor (8) through a transmission mechanism. The rear frame plate is provided with a relief opening (31) at a position between the two optical axis guide rails (4), and the relief opening (31) is arranged to allow the second motor to pass through.

2. The CNC knife sharpening machine head according to claim 1, characterized in that: The sliding hole (11) is a stepped hole, comprising an outer hole and an inner hole that are interconnected, the aperture of the inner hole matches the outer diameter of the optical axis guide rail (4), the aperture of the outer hole is larger than the aperture of the inner hole, two guide rail copper sleeves (41) are arranged in the outer hole, an oil-absorbing sponge ring (42) is arranged between the two guide rail copper sleeves (41), the inner diameters of the guide rail copper sleeves (41) and the inner diameters of the oil-absorbing sponge ring (42) both match the outer diameter of the optical axis guide rail (4) and are sleeved on the optical axis guide rail (4), a pressure ring (43) is arranged on the outer side of the outer hole, the aperture of the pressure ring (43) matches the outer diameter of the optical axis guide rail (4) and is connected and fixed to the machine head base (1) in a detachable manner.

3. The CNC knife sharpening machine head according to claim 1, characterized in that: The screw nut (5) comprises an integrally formed nut portion (51) and a connecting portion (52); the nut portion (51) is threadedly connected to the screw (6); a connecting block (211) is integrally formed at the bottom of the grinding base (21); the connecting block (211) is provided with a mounting hole; the nut portion (51) is arranged through the mounting hole; and the connecting portion (52) is connected and fixed to the connecting block (211) in a detachable manner.

4. The CNC knife sharpening machine head according to claim 1, characterized in that: The transmission mechanism comprises a bearing seat (7) and a coupling (9); the bearing seat (7) is fixed on the inner side of the rear portion of the machine head base (1) at a position corresponding to the avoidance hole (12); a screw hole is provided on the side of the bearing seat (7) facing the screw (6); one end of the screw (6) passes through the screw hole and is connected to the output end of the coupling (9) arranged in the bearing seat (7); and the input end of the coupling (9) is connected to the output end of the second motor (8).

5. The CNC knife sharpening machine head according to claim 4, characterized in that: One end of the screw rod (6) passing through the screw rod hole is provided with a bearing cover (71), a bearing (72), a bearing washer (73) and a tightening nut (74) in sequence from the side away from the bearing seat (7) to the side close to the bearing seat (7); the bearing (72), the bearing washer (73) and the tightening nut (74) are all located in the bearing seat (7); the bearing cover (71) is arranged on the outer side of the bearing seat (7) and is connected and fixed to the bearing seat (7) in a detachable manner.

6. The CNC knife sharpening machine head according to claim 4, characterized in that: The coupling (9) is a plum blossom coupling.

7. The CNC knife sharpening machine head according to claim 1, characterized in that: The second motor (8) is provided with a motor cover (81) outside, and the avoidance opening (31) is configured to allow the motor cover (81) to pass through.

8. The CNC knife sharpening machine head according to claim 1, characterized in that: The second motor (8) is a servo motor.

9. The CNC knife sharpening machine head according to any one of claims 1 to 8, characterized in that: The first motor (23) is connected to the grinding base (21) via a motor support platform (22); the motor support platform (22) comprises a fixing plate (221) and a motor mounting plate (222); the rear side of the fixing plate (221) and the rear side of the motor mounting plate (222) are hinged; the first motor (23) is fixed to the top surface of the motor mounting plate (222); and the front bottom surface of the motor mounting plate (222) is connected to a height adjustment mechanism.

10. The CNC knife sharpening machine head according to claim 9, characterized in that: The height adjustment mechanism comprises an articulated seat (2221), a telescopic rod (223) and an adjusting hydraulic cylinder; the articulated seat (2221) is fixed to the bottom surface of the motor mounting plate (222) near the front side; the top end of the telescopic rod (223) is hinged to the articulated seat (2221); the bottom end of the telescopic rod (223) is connected to the output end of the adjusting hydraulic cylinder; and the adjusting hydraulic cylinder is connected and fixed to the grinding base (21).

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