A servo transmission device for a numerical control machine tool and its usage method

Abstract

The present invention relates to the technical field of machining, and specifically to a servo transmission device for a numerical control machine tool, including a transmission frame. A placement frame is arranged on the top of the transmission frame, and a driving mechanism is arranged inside the transmission frame. By arranging the driving mechanism inside the transmission frame, and using the cooperation of the driving lead screw and the driving chain in the driving mechanism, the movable block has a large torque when the transmission starts, thus effectively solving the problem of jamming when the platform starts. The surface of the driving lead screw is threadedly connected to the inside of the movable block. When controlling the rotation of the driving lead screw, the driving force on the movable block is shared by the driving lead screw and the driving chain, significantly improving the smoothness when the platform starts. At the same time, it also reduces the wear amount of the driving gear and the teeth on the surface of the driving lead screw, ensuring the stability of the servo transmission device during the workpiece transmission process and extending the service life of the servo transmission device.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and particularly to a servo transmission device for a numerical control machine tool and a using method thereof. Background Art

[0002] The transfer platforms used in existing servo transmission devices are of two types: lead screws and racks. They are fixed outside the platform brackets by fixing parts and the platform moves forward by the rotation of the lead screws and racks under the platform. Since the lead screws and racks are fixed at the top of the platform brackets, when transporting objects or products with relatively large weights, the platform often gets stuck during startup or the racks get worn, making it difficult to accurately control the movement of the transfer platform.

[0003] Therefore, we have proposed a servo transmission device for a numerical control machine tool. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a servo transmission device for a numerical control machine tool and a using method thereof, which are used to solve the problem of platform jamming during startup, reduce the wear of driving parts at the same time, and ensure the stability of the displacement of the transfer platform.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A servo transmission device for a numerical control machine tool includes a transfer frame. A placement frame is arranged at the top of the transfer frame. A plurality of balls are arranged on both sides of the bottom of the placement frame, and rolling grooves matched with the balls are arranged on both sides of the top of the transfer frame. A driving mechanism is arranged inside the transfer frame. The driving mechanism includes a movable block, a driving lead screw and a driving chain. The movable block is slidably arranged inside the transfer frame. A driving lead screw is rotatably arranged inside the transfer frame, and one end of the driving lead screw penetrates through the inside of the movable block. A threaded hole matched with the driving lead screw is formed inside the movable block, and the surface of the driving lead screw is threadedly connected with the inside of the threaded hole. A through groove is further formed on one side inside the movable block, and a plurality of driving gears are arranged inside the through groove. A driving chain is rotatably arranged inside the transfer frame, and the surface of the driving chain is meshed with the surfaces of the plurality of driving gears respectively;

[0006] Calibration components are arranged on both sides of the placement frame. The calibration components include a calibration frame and positioning plates. Two positioning plates are arranged on one side of the calibration frame. Two servo electric cylinders are arranged inside the calibration frame, and the driving ends of the two servo electric cylinders are respectively connected with one side of the two positioning plates. One sides of the two positioning plates are respectively slidably arranged on both sides inside the calibration frame.

[0007] Preferably, blanking grooves are arranged on both sides of the inner wall of the rolling groove, and pushing plates are arranged on both sides of the bottom of the placement frame.

[0008] Preferably, sliding wheels are arranged on both sides of the bottom of the movable block, and support frames matched with the sliding wheels are arranged on both sides of the bottom of the inner wall of the conveying rack, and the two sliding wheels are respectively arranged to roll inside the two support frames.

[0009] Preferably, calibration lead screws are arranged on both sides inside the placement rack, and one ends of the two calibration lead screws penetrate through the inside of the calibration frame, and the surfaces of the two calibration lead screws are threadedly connected with the inside of the calibration frame.

[0010] Preferably, a first oil tank is arranged on one side of the front surface of the conveying rack, and an automatic control valve is arranged at the oil outlet end of the first oil tank. An oil application roller is rotatably arranged on one side inside the conveying rack, and the surface of the oil application roller is in contact with the inside of the driving chain. One end of the first oil tank extends into the inside of the oil application roller.

[0011] Preferably, a second oil tank is arranged inside the movable block, and a connecting block is arranged on one side of the second oil tank. An oil application brush is arranged at the bottom of the connecting block, and a connecting cover is arranged at the top of the oil application brush.

[0012] Preferably, a spring is arranged at the top of the connecting cover, and the top end of the spring is connected to the top of the inner wall of the connecting block.

[0013] Preferably, connecting frames are arranged on both sides of the bottom of the placement rack, and the bottoms of the two connecting frames are respectively connected to both sides of the top of the movable block. Sliding grooves matched with the connecting frames are respectively arranged on both sides inside the conveying rack, and sealing strips are arranged inside the two sliding grooves.

[0014] Preferably, a ball bearing rack is further arranged inside the placement rack, and both sides of the ball bearing rack are driven by electric push rods.

[0015] Preferably, a usage method of a servo transmission device of a numerical control machine tool specifically includes the following steps:

[0016] Step 1: Place the workpiece on the placement rack through the robotic arm. At this time, control the ball bearing rack to move upward inside the placement rack, so that the bottom of the workpiece contacts the upper end surface of the ball bearing rack. Then control the calibration lead screw to rotate clockwise, so that the calibration frames on both sides of the placement rack approach each other. Then, driven by the driving end of the servo electric cylinder, make the two positioning plates approach each other, and adjust the position of the workpiece above the placement rack to the middle of the placement rack through the calibration frame and the positioning plate. Then control the ball bearing rack to descend, so that the lower end surface of the workpiece directly contacts the upper end surface of the placement rack;

[0017] Step 2: When performing servo transmission drive, control the driving lead screw to rotate. The movable block displaces along the driving lead screw inside the transmission rack. At the same time, the driving chain drives. By using the meshing drive between the surface of the driving chain and the driving gear, a driving force is provided for the displacement of the movable block inside the transmission rack. At this time, the movable block drives the placement rack to displace on the top of the transmission rack through the connecting frame;

[0018] Step 3: During the displacement of the movable block, the two sliding wheels provide a supporting force for the displacement of the movable block inside the transmission rack. At the same time, the balls provide rolling support for the placement rack on the upper end surface of the transmission rack;

[0019] Step 4: Regularly send lubricating oil into the upper oil roller from the first oil tank and the automatic control valve to regularly lubricate the teeth inside the driving chain. Indirectly lubricate the tooth surface of the driving gear by using the driving chain. Directly lubricate the surface of the driving lead screw by using the upper oil brush.

[0020] The present invention provides a servo transmission device for a numerical control machine tool and its usage method. Compared with the prior art, it has the following beneficial effects:

[0021] By arranging a driving mechanism inside the transmission rack and using the driving lead screw and the driving chain in the driving mechanism to cooperate with each other, the movable block has a large torque when the transmission starts, thus effectively solving the problem of jamming when the platform starts; The surface of the driving lead screw is threadedly connected to the inside of the movable block. When controlling the driving lead screw to rotate, the movable block displaces along the driving lead screw inside the transmission rack. At the same time, the driving chain drives. By using the meshing drive between the surface of the driving chain and the driving gear, a driving force is provided for the displacement of the movable block inside the transmission rack. By sharing the driving force on the movable block by the driving lead screw and the driving chain, the smoothness when the platform starts is significantly improved. At the same time, the wear amount of the tooth surface of the driving gear and the driving lead screw is also reduced, ensuring the stability of the servo transmission device during the workpiece transmission process and extending the service life of the servo transmission device.

[0022] By arranging a first oil tank on the transmission rack and cooperating with the upper oil roller inside the transmission rack to regularly lubricate the teeth inside the driving chain, and indirectly lubricating the tooth surface of the driving gear by using the driving chain, the wear amount on the surface of the driving gear is further reduced, the service life of the driving gear is extended, and the stability during the platform driving process is ensured; By arranging a second oil tank inside the movable block and cooperating with the upper oil brush to continuously lubricate the surface of the driving lead screw, the surface of the driving lead screw is prevented from being too dry, the wear amount of the driving lead screw during the displacement of the movable block is significantly reduced, and the smoothness when the platform starts is ensured.

[0023] By setting a calibration component at the top of the placement rack, the position of the workpiece above the placement rack is adjusted to the middle of the placement rack by using the calibration component, so that the force on the placement rack is uniform, the wear of the driving lead screw and the driving gear in the driving mechanism is reduced, and it is avoided that the workpiece is on one side of the upper end face of the placement rack, applying a large pressure to one side of the placement rack, thereby affecting the torque transmission in the driving mechanism, and further ensuring the smoothness when the platform starts. Brief Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the structure of a servo transmission device of a numerical control machine tool according to an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the transfer rack according to an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the movable block and the sliding wheel according to an embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the movable block and the second oil tank according to an embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of the internal structure of the second oil tank and the connecting block according to an embodiment of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the placement rack and the ball rack according to an embodiment of the present invention;

[0030] Figure 7 It is a schematic diagram of the structure of the placement rack and the calibration rack according to an embodiment of the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the transfer rack and the connecting rack according to an embodiment of the present invention.

[0032] In the figure, 10, transfer rack; 20, placement rack; 30, ball; 40, rolling groove; 50, blanking groove; 60, pushing plate; 11, movable block; 12, driving lead screw; 13, driving chain; 14, threaded hole; 15, through groove; 16, driving gear; 17, sliding wheel; 18, support frame; 21, first oil tank; 22, automatic control valve; 23, upper oil roller; 24, second oil tank; 25, connecting block; 26, upper oil brush; 27, connecting cover; 28, spring; 31, calibration rack; 32, positioning plate; 33, servo electric cylinder; 34, calibration lead screw; 35, ball rack; 36, connecting rack; 37, sliding groove; 38, sealing strip. Detailed Embodiments

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] Please refer to Figures 1 to 8 As shown in the figure, a servo transmission device for a numerically controlled machine tool includes a transmission rack 10. A placement rack 20 is provided at the top of the transmission rack 10. A plurality of balls 30 are provided on both sides of the bottom of the placement rack 20. And rolling grooves 40 that cooperate with the balls 30 are provided on both sides of the top of the transmission rack 10. Among them, eight balls 30 are provided at the bottom of the placement rack 20, and four balls 30 are in a group. The two groups of balls 30 are symmetrically arranged on both sides of the bottom of the placement rack 20. The balls 30 are rotatably provided at the bottom of the placement rack 20, and the two groups of balls 30 are respectively arranged to roll inside the two rolling grooves 40. The balls 30 are used to improve the stability and smoothness of the displacement of the placement rack 20 on the transmission rack 10; both sides of the inner wall of the rolling groove 40 are provided with material dropping grooves 50, and both sides of the bottom of the placement rack 20 are provided with pushing plates 60. When controlling the displacement of the placement rack 20 on the top of the transmission rack 10, the balls 30 at the bottom of the placement rack 20 rotate inside the rolling groove 40. At the same time, the pushing plates 60 are used to clean the ash and impurities inside the rolling groove 40, and the ash and impurities are sent out through the material dropping grooves 50 to ensure the smoothness during the platform displacement.

[0036] A driving mechanism is provided inside the transmission rack 10. The driving mechanism includes a movable block 11, a driving lead screw 12 and a driving chain 13. And the movable block 11 is slidably provided inside the transmission rack 10. A driving lead screw 12 is rotatably provided inside the transmission rack 10, and one end of the driving lead screw 12 penetrates through the inside of the movable block 11. A threaded hole 14 that cooperates with the driving lead screw 12 is provided inside the movable block 11, and the surface of the driving lead screw 12 is threadedly connected to the inside of the threaded hole 14. A through groove 15 is also provided on one side inside the movable block 11, and a plurality of driving gears 16 are provided inside the through groove 15. A driving chain 13 is rotatably provided inside the transmission rack 10, and the surface of the driving chain 13 is respectively meshed with the surfaces of the plurality of driving gears 16. Among them, one end of the driving lead screw 12 is driven by a servo motor, and one end inside the driving chain 13 is also driven by a servo motor;

[0037] It should be noted that when performing servo transmission drive, the driving screw 12 and the driving chain 13 in the driving mechanism cooperate with each other to make the movable block 11 have a large torque when the transmission is started, thereby effectively solving the problem of jamming when the platform is started; the surface of the driving screw 12 is connected to the internal thread of the movable block 11, and when the driving screw 12 is controlled to rotate, the movable block 11 is displaced along the driving screw 12 inside the transmission frame 10, and the driving chain 13 is driven at the same time, and the meshing transmission between the surface of the driving chain 13 and the driving gear 16 is used to provide driving force for the displacement of the movable block 11 inside the transmission frame 10, and the driving force of the movable block 11 is shared by the driving screw 12 and the driving chain 13, which significantly improves the smoothness of the platform startup, and also reduces the wear of the teeth on the surface of the driving gear 16 and the driving screw 12, thereby ensuring the stability of the servo transmission device during the workpiece transmission process and extending the service life of the servo transmission device.

[0038] Furthermore, sliding wheels 17 are provided on both sides of the bottom of the movable block 11, and support frames 18 matching the sliding wheels 17 are provided on both sides of the bottom of the inner wall of the conveying frame 10, and the two sliding wheels 17 are respectively located inside the two support frames 18 and are rolled. The two sliding wheels 17 are used to provide support force for the displacement of the movable block 11 inside the conveying frame 10, and the two sliding wheels 17 are respectively rolled inside the two support frames 18, which significantly reduces the friction force of the displacement of the movable block 11 inside the conveying frame 10, thereby further improving the smoothness of the platform startup.

[0039] Example 2

[0040] A first oil tank 21 is provided on one side of the front of the conveying frame 10, and an automatic control valve 22 is provided at the oil outlet end of the first oil tank 21. An oiling roller 23 is rotatably provided on one side inside the conveying frame 10, and the surface of the oiling roller 23 contacts the inside of the driving chain 13. One end of the first oil tank 21 extends to the inside of the oiling roller 23. The first oil tank 21 and the automatic control valve 22 are used to regularly deliver lubricating oil to the inside of the oiling roller 23, and the teeth inside the driving chain 13 are regularly lubricated. The driving chain 13 is used to indirectly lubricate the tooth surface of the driving gear 16, thereby further reducing the amount of wear on the surface of the driving gear 16, extending the service life of the driving gear 16, and ensuring the stability of the platform during driving.

[0041] Inside the movable block 11, a second oil tank 24 is provided. On one side of the second oil tank 24, a connecting block 25 is provided. At the bottom of the connecting block 25, an upper oil brush 26 is provided. On the top of the upper oil brush 26, a connecting cover 27 is provided. On the top of the connecting cover 27, a spring 28 is provided, and the top end of the spring 28 is connected to the top of the inner wall of the connecting block 25. After assembling the inside of the second oil tank 24 and the movable block 11, the upper oil brush 26 at the bottom of the connecting cover 27 contacts the surface of the driving lead screw 12. The lubricating oil inside the second oil tank 24 is connected through the oil-absorbing sponge strip and the inside of the upper oil brush 26, ensuring that the lubricating oil inside the upper oil brush 26 will not dry out. Thus, the upper oil brush 26 can continuously lubricate the surface of the driving lead screw 12 effectively, preventing the surface of the driving lead screw 12 from being too dry, significantly reducing the wear amount of the driving lead screw 12 during the displacement of the movable block 11, and ensuring the smoothness when the platform starts.

[0042] Embodiment 3

[0043] Calibration components are provided on both sides of the placement rack 20. The calibration components include a calibration frame 31 and positioning plates 32. Two positioning plates 32 are provided on one side of the calibration frame 31. Inside the calibration frame 31, two servo electric cylinders 33 are provided, and the driving ends of the two servo electric cylinders 33 are respectively connected to one side of the two positioning plates 32. One side of the two positioning plates 32 is slidably arranged on both sides inside the calibration frame 31. On both sides inside the placement rack 20, calibration lead screws 34 are provided, and one end of each of the two calibration lead screws 34 penetrates inside the calibration frame 31. The surfaces of the two calibration lead screws 34 are threadedly connected to the inside of the calibration frame 31, and one end of each of the two calibration lead screws 34 is provided with rotational driving force by a motor;

[0044] It should be noted that the external thread helix directions on both sides of the surface of the calibration lead screw 34 are opposite. Therefore, during the clockwise rotation of the calibration lead screw 34, the calibration frames 31 on both sides of the placement rack 20 approach each other. Then, driven by the driving ends of the servo electric cylinders 33, the two positioning plates 32 approach each other, adjusting the position of the workpiece above the placement rack 20 to the middle of the placement rack 20, preventing the workpiece from being on one side of the upper end surface of the placement rack 20 and applying a large pressure on one side of the placement rack 20, thereby affecting the torque transmission in the driving mechanism and further ensuring the smoothness when the platform starts.

[0045] The interior of the placement rack 20 is also provided with a ball rack 35, and both sides of the ball rack 35 are driven by electric push rods. A through port matching the ball rack 35 is opened at the top of the placement rack 20. When adjusting the position of the workpiece on the placement rack 20, the electric push rod drives the ball rack 35 to move upward inside the placement rack 20, making the bottom of the workpiece contact the upper end surface of the ball rack 35. Then, the position of the workpiece is adjusted in cooperation with the calibration assembly, so that the whole workpiece is located in the middle of the placement rack 20, making the force on the placement rack 20 uniform and reducing the wear of the driving lead screw 12 and the driving gear 16 in the driving mechanism.

[0046] Both sides of the bottom of the placement rack 20 are provided with connecting frames 36, and the bottoms of the two connecting frames 36 are respectively connected to both sides of the top of the movable block 11. Sliding grooves 37 matching the connecting frames 36 are opened on both sides inside the transfer rack 10, and sealing strips 38 are arranged inside the two sliding grooves 37. The inside of the transfer rack 10 is isolated from the outside through the sealing strips 38, reducing the entry of dust into the inside of the transfer rack 10 and causing adverse transfer effects on the driving mechanism, and improving the transfer stability of the driving mechanism.

[0047] Embodiment 4

[0048] Please refer to Figures 1 to 8 As shown in the figure, a usage method of a servo transfer device of a numerical control machine tool specifically includes the following steps:

[0049] Step 1: Place the workpiece on the placement rack 20 through the robotic arm. At this time, control the ball rack 35 to move upward inside the placement rack 20, making the bottom of the workpiece contact the upper end surface of the ball rack 35. Then, control the calibration lead screw 34 to rotate clockwise, making the calibration frames 31 on both sides of the placement rack 20 approach each other. Then, driven by the driving end of the servo cylinder 33, make the two positioning plates 32 approach each other. Adjust the position of the workpiece above the placement rack 20 to the middle of the placement rack 20 through the calibration frames 31 and the positioning plates 32. Then, control the ball rack 35 to descend, making the lower end surface of the workpiece directly contact the upper end surface of the placement rack 20;

[0050] Step 2: When performing servo transfer drive, control the driving lead screw 12 to rotate. The movable block 11 displaces inside the transfer rack 10 along the driving lead screw 12. At the same time, the driving chain 13 is driven. Using the meshing drive between the surface of the driving chain 13 and the driving gear 16, provide driving force for the displacement of the movable block 11 inside the transfer rack 10. At this time, the movable block 11 drives the placement rack 20 to displace on the top of the transfer rack 10 through the connecting frame 36;

[0051] Step 3: During the displacement of the movable block 11, the two sliding wheels 17 provide a supporting force for the displacement of the movable block 11 inside the transfer rack 10. At the same time, the balls 30 provide rolling support for the placement rack 20 on the upper end surface of the transfer rack 10;

[0052] Step 4: Regularly send lubricating oil into the interior of the upper oil roller 23 by using the first oil tank 21 and the automatic control valve 22 to regularly lubricate the teeth inside the drive chain 13, indirectly lubricate the tooth surfaces of the drive gear 16 by using the drive chain 13, and directly lubricate the surface of the drive lead screw 12 by using the upper oil brush 26.

[0053] Meanwhile, the content not detailedly described in this specification belongs to the prior art well known to those skilled in the art.

[0054] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0055] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A servo transmission device for a numerical control machine tool, comprising a transmission frame (10), a placement frame (20) is arranged at the top of the transmission frame (10), a plurality of balls (30) are arranged on both sides of the bottom of the placement frame (20), and rolling grooves (40) matched with the balls (30) are arranged on both sides of the top of the transmission frame (10), blanking grooves (50) are arranged on both sides of the inner wall of the rolling groove (40), and pushing plates (60) are arranged on both sides of the bottom of the placement frame (20), characterized in that: A driving mechanism is arranged inside the conveying frame (10). The driving mechanism includes a movable block (11), a driving lead screw (12) and a driving chain (13). The movable block (11) is slidably arranged inside the conveying frame (10). The driving lead screw (12) is rotatably arranged inside the conveying frame (10), and one end of the driving lead screw (12) penetrates through the inside of the movable block (11). A threaded hole (14) matching the driving lead screw (12) is formed inside the movable block (11), and the surface of the driving lead screw (12) is threadedly connected with the inside of the threaded hole (14). A through groove (15) is further formed on one side inside the movable block (11), and a plurality of driving gears (16) are arranged inside the through groove (15). The driving chain (13) is rotatably arranged inside the conveying frame (10), and the surface of the driving chain (13) is meshed with the surfaces of the plurality of driving gears (16) respectively. Sliding wheels (17) are arranged on both sides of the bottom of the movable block (11). Support frames (18) matching the sliding wheels (17) are arranged on both sides of the bottom of the inner wall of the conveying frame (10), and the two sliding wheels (17) are respectively arranged to roll inside the two support frames (18); A first oil tank (21) is arranged on one side of the front surface of the conveying frame (10), and an automatic control valve (22) is arranged at the oil outlet end of the first oil tank (21). An oiling roller (23) is rotatably arranged on one side inside the conveying frame (10), and the surface of the oiling roller (23) is in contact with the inside of the driving chain (13). One end of the first oil tank (21) extends into the inside of the oiling roller (23). A second oil tank (24) is arranged inside the movable block (11), and a connecting block (25) is arranged on one side of the second oil tank (24). An oiling brush (26) is arranged at the bottom of the connecting block (25), and a connecting cover (27) is arranged at the top of the oiling brush (26); Calibration components are provided on both sides of the placement rack (20). The calibration components include a calibration rack (31) and a positioning plate (32). Two positioning plates (32) are provided on one side of the calibration rack (31). Two servo electric cylinders (33) are provided inside the calibration rack (31). The driving ends of the two servo electric cylinders (33) are respectively connected to one side of the two positioning plates (32). One sides of the two positioning plates (32) are respectively slidably arranged on both sides inside the calibration rack (31). Calibration lead screws (34) are provided on both sides inside the placement rack (20). One ends of the two calibration lead screws (34) penetrate inside the calibration rack (31). The surfaces of the two calibration lead screws (34) are threadedly connected to the inside of the calibration rack (31). Connecting frames (36) are provided on both sides of the bottom of the placement rack (20). The bottoms of the two connecting frames (36) are respectively connected to both sides of the top of the movable block (11). Sliding grooves (37) matching the connecting frames (36) are provided on both sides inside the conveying rack (10). Sealing strips (38) are provided inside the two sliding grooves (37). A ball rack (35) is further provided inside the placement rack (20). Both sides of the ball rack (35) are driven by electric push rods.

2. The servo transmission device of a numerical control machine tool according to claim 1, characterized in that: A spring (28) is provided on the top of the connection cover (27). The top end of the spring (28) is connected to the top of the inner wall of the connection block (25).

3. A method for using a servo transmission device of a numerical control machine tool, which refers to the servo transmission device of a numerical control machine tool described in any one of claims 1-2, characterized in that: Specifically, it includes the following steps: Step 1: Place the workpiece on the placement rack (20) through a robotic arm. At this time, control the ball rack (35) to move upward inside the placement rack (20) so that the bottom of the workpiece contacts the upper end surface of the ball rack (35). Then control the calibration lead screw (34) to rotate clockwise to make the calibration racks (31) on both sides of the placement rack (20) approach each other. Then, driven by the driving ends of the servo electric cylinders (33), make the two positioning plates (32) approach each other. Adjust the position of the workpiece above the placement rack (20) to the middle of the placement rack (20) through the calibration rack (31) and the positioning plate (32). Then control the ball rack (35) to descend so that the lower end surface of the workpiece directly contacts the upper end surface of the placement rack (20). Step 2: During servo transmission drive, control the drive lead screw (12) to rotate. The movable block (11) displaces along the drive lead screw (12) inside the conveying rack (10). At the same time, the drive chain (13) is driven. Utilize the meshing drive between the surface of the drive chain (13) and the drive gear (16) to provide a driving force for the displacement of the movable block (11) inside the conveying rack (10). At this time, the movable block (11) drives the placement rack (20) to displace on the top of the conveying rack (10) through the connecting frame (36). Step 3: During the displacement of the movable block (11), the two sliding wheels (17) provide a supporting force for the displacement of the movable block (11) inside the conveying rack (10). At the same time, the balls (30) provide rolling support for the placement rack (20) on the upper end surface of the conveying rack (10). Step 4: Regularly feed lubricating oil into the interior of the upper oil roller (23) using the first oil tank (21) and the automatic control valve (22) to regularly lubricate the teeth inside the drive chain (13), indirectly lubricate the tooth surfaces of the drive gear (16) using the drive chain (13), and directly lubricate the surface of the drive lead screw (12) using the oiling brush (26).

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