Double-tool-rest structure for numerical control machine tool

Abstract

The double-tool-rest structure for the numerical control machine tool comprises a main base, a sliding groove is formed in the outer surface of the top end of the main base, a first screw and a second screw are arranged at the two ends of the inner wall of the sliding groove, the first screw and the second screw are symmetrically arranged, and a rotating shaft is fixedly installed at one end of the second screw; a connecting assembly is arranged between the first screw rod and the second screw rod, and the first screw rod and the second screw rod are connected through the connecting assembly. By arranging a double-screw structure of the first screw and the second screw, the tool rests on the two sides are controlled and adjusted, the tool rests on the two sides can be synchronously adjusted at the same time, the first screw and the second screw are connected through the connecting assembly, connection of the first screw and the second screw is disconnected according to the situation, single operation is conducted, and the operation efficiency is improved. And the operation modes of the tool rest are increased.

Description

Technical Field

[0001] The present invention relates to the field of numerically controlled machine tools, and more particularly to a double tool rest structure for numerically controlled machine tools. Background Art

[0002] CNC machine tool is the abbreviation of digital control machine tool. It is an automated machine tool equipped with a program control system. The control system can logically process programs specified by control codes or other symbolic instructions, decode them, and express them in coded numbers. The information carrier is input into the CNC device, and the CNC device sends various control signals after calculation and processing to control the movement of the machine tool. It automatically processes parts according to the shape and size required by the drawing. The tool holder is an important component for placing the tool, and many tool holders are also directly involved in the cutting work.

[0003] Most of the existing CNC machine tools are operated with a single tool post, which increases the number of tool posts and thus increases the difficulty of controlling the tool posts. In addition, when the double tool posts are controlled and moved, the control method is relatively simple and cannot be adjusted according to the operating conditions.

[0004] In addition, the existing double tool holder needs to perform linear feeding before using the tool head for processing, which is usually completed by screw drive, but the double tool heads need to be fed twice separately, and require high-precision rotary encoders and synchronizers for coordinated control. Other existing solutions usually use rotary electromagnetic clutches for synchronous docking, which can perform high-precision synchronous coordinated feeding, but rotary electromagnetic clutches are usually expensive and the transmission torque cannot be greatly increased, and traditional mechanical docking cannot perform differentiated stroke control of the double tool heads, and several tool head feed amounts are generally pre-fabricated for different processing scenarios, so that pre-adjustments can be made for different workpiece shapes, saving subsequent adjustment time, but the existing pre-adjustments are all collected and subsequently adjusted using precise encoders, which are not reliable enough and have high costs. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a double tool holder structure for a CNC machine tool. By setting a double screw structure of a first screw and a second screw, the tool holders on both sides are controlled and adjusted, and the tool holders on both sides can be adjusted synchronously at the same time. In addition, the first screw and the second screw are connected by a connecting assembly. The connection between the first screw and the second screw is disconnected according to the situation to perform a single operation, thereby increasing the operation methods of the tool holder.

[0006] To achieve the above object, the present invention provides the following technical solution: a double tool holder structure for a CNC machine tool, comprising:

[0007] A main seat, wherein a slide groove is provided on the outer surface of the top end of the main seat, a first screw and a second screw are provided at both ends of the inner wall of the slide groove, and the first screw and the second screw are symmetrically arranged, and a rotating shaft is fixedly installed at one end of the second screw, and a connecting component is provided between the first screw and the second screw, and the first screw and the second screw are connected through the connecting component;

[0008] The mounting seat has two groups of mounting seats, and the two groups are arranged on both sides of the top of the main seat. A slider is fixedly installed on the bottom end of the mounting seat, and the slider is respectively sleeved on the outer surfaces of the first screw and the second screw. The slider is threadedly connected to the first screw and the second screw respectively. A tool holder is fixedly installed on the top of the mounting seat, and a tool holder for fixing the tool is fixedly installed on the top of the tool holder.

[0009] A motor is fixedly mounted on one end of the main seat, and one end of the output shaft of the motor is fixedly connected to one end of the first screw rod.

[0010] The connecting assembly includes a first connecting disk fixedly mounted on one end of a first screw rod and a second connecting disk fixedly mounted on one end of a second screw rod, a rotating disk fixedly mounted on one end of the first connecting disk, and the first connecting disk is rotatably connected to the second connecting disk via the rotating disk, a limiting assembly is arranged inside the second connecting disk, and the first connecting disk and the second connecting disk are fixedly connected via the limiting assembly.

[0011] The limiting assembly comprises a mounting groove formed on the outer surface of the top end of the second connecting disk, a limiting rod is arranged inside the mounting groove, and a plurality of limiting grooves matching one end of the limiting rod are formed on the outer surface around the rotating disk.

[0012] The inner wall of the second connecting disk is located above the limit rod and an electromagnet is fixedly installed thereon. According to the number of segments in the preset feed amount segmentation configuration file of the tool head, the same number of slots are selected in the limit slot as preset slots, and the distribution axial circumferential spacing of the multiple preset slots is determined according to the feed amount difference between the preset feed amount segments. A magnetic ring is embedded in the slot body of each preset slot, and the depths of the magnetic rings in different preset slot bodies are different. A wireless Hall sensor component is embedded in the end of the limit rod body close to the limit slot. The ejection timing of the electromagnet is controlled based on the output of the wireless Hall sensor component and the preset feed amount segmentation configuration file. The wireless Hall sensor component and the preset feed amount segmentation configuration file are integrated in an external controller, which is connected to the motor. Each feed amount segment corresponds to a unique Hall sensor output value, and the external controller is connected to the electromagnet.

[0013] The inner wall of the second connecting disk is located above the limit rod and an electromagnet is fixedly installed thereon. The outer surface of the limit rod is sleeved with a retaining ring. The outer surface of the limit rod is located below the retaining ring and a retaining sheet is fixedly installed thereon. The outer surface of the limit rod is located between the retaining sheet and the retaining ring and a reset spring is sleeved thereon.

[0014] Furthermore, the bottom end of the tool holder is slidably connected to the tool seat, a third screw is rotatably installed inside the tool seat, and the third screw is threadedly connected to the bottom end of the tool holder.

[0015] Furthermore, the bottom end of the third screw is fixedly connected to the second gear, the interior of the knife seat is rotatably mounted on one side of the second gear with a first gear, and the first gear is meshingly connected with the second gear, and the top of the first gear is fixedly mounted with a knob, and the top of the knob is provided with a groove.

[0016] Furthermore, a slot is provided at the top of the inner wall of the tool holder, and a pressing sheet is inserted into the slot.

[0017] Furthermore, latches are inserted into the four corners of the top of the tool holder, mounting holes matching the bottom ends of the latches are formed at the four corners of the outer surface of the pressing plate, and the bottom ends of the latches are inserted into the mounting holes.

[0018] Technical effects and advantages of the present invention:

[0019] 1. The present invention does not need to set up a rotary clutch. By setting magnetic rings of different axial spacings and built-in depths according to preset configuration files, the double cutter heads can reach the preset target positions respectively without the need for precise matching of dual rotary encoders and participation of synchronous controllers, and can perform homing and initial adjustment of the preset feed amount with high reliability.

[0020] 2. The present invention controls and adjusts the tool holders on both sides by setting a double screw structure of a first screw and a second screw, and can simultaneously adjust the tool holders on both sides. The first screw and the second screw are connected by a connecting assembly, and the connection between the first screw and the second screw is disconnected according to the situation to perform a single operation, thereby increasing the operation mode of the tool holder;

[0021] 3. The present invention drives the tool holder to be raised and lowered by screw transmission, so as to install and fix the tool, and a gear transmission structure is added to the bottom end of the screw. The accuracy of screw adjustment is increased by gear transmission, and the tool is more stable when being fixed. In addition, the pressure plate used to fix the tool can be replaced regularly as needed to avoid deformation of the pressure plate affecting the fixing effect of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the knife holder installation structure of the present invention.

[0024] Figure 3 It is an exploded view of the installation structure of the first connection plate and the second connection plate of the present invention.

[0025] Figure 4 It is a cross-sectional view of the first connection plate and the second connection plate of the present invention.

[0026] Figure 5 It is a schematic diagram of the installation structure of the knife holder of the present invention.

[0027] Figure 6 It is a cross-sectional view of the mounting seat of the present invention.

[0028] Figure 7 An exploded view of the knife holder of the present invention;

[0029] Figure 8 for Figure 8 It is a cross-sectional view of the turntable of the present invention.

[0030] The accompanying drawings are marked as follows: 1. main seat; 11. motor; 12. slide groove; 13. first screw; 14. second screw; 15. rotating shaft; 2. first connecting plate; 21. rotating plate; 22. limiting groove; 221. magnetic ring; 23. second connecting plate; 24. mounting groove; 25. electromagnet; 26. limiting rod; 27. retaining ring; 28. retaining plate; 29. ​​reset spring; 3. mounting seat; 31. slider; 32. knife seat; 33. knife holder; 34. slot; 35. pressing plate; 351. mounting hole; 36. first gear; 361. knob; 37. second gear; 371. third screw; 38. latch. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] according to Figure 1-4 A double tool rest structure for a numerically controlled machine tool is shown, comprising a main seat 1, a top outer surface of the main seat 1 is provided with a slide groove 12, two ends of the inner wall of the slide groove 12 are provided with a first screw rod 13 and a second screw rod 14, and the first screw rod 13 and the second screw rod 14 are symmetrically arranged, and a rotating shaft 15 is fixedly installed at one end of the second screw rod 14, a connecting component is provided between the first screw rod 13 and the second screw rod 14, and the first screw rod 13 and the second screw rod 14 are connected by the connecting component;

[0033] A motor 11 is fixedly installed at one end of the main seat 1, and one end of the output shaft of the motor 11 is fixedly connected to one end of the first screw 13. The motor 11 at one end of the main seat 1 is started, and the first screw 13 and the second screw 14 are driven to rotate by the motor 11. The first screw 13 and the second screw 14 are symmetrically arranged and threadedly connected to the slider 31, thereby driving the tool holder 33 to move in a symmetrical direction along the slide groove 12.

[0034] The connecting assembly includes a first connecting disk 2 fixedly mounted on one end of the first screw rod 13 and a second connecting disk 23 fixedly mounted on one end of the second screw rod 14, a rotating disk 21 is fixedly mounted on one end of the first connecting disk 2, and the first connecting disk 2 is rotatably connected to the second connecting disk 23 through the rotating disk 21, a limiting assembly is arranged inside the second connecting disk 23, and the first connecting disk 2 and the second connecting disk 23 are fixedly connected through the limiting assembly, the limiting assembly includes a mounting groove 24 provided on the outer surface of the top end of the second connecting disk 23, a limiting rod 26 is arranged inside the mounting groove 24, a plurality of limiting grooves 22 matching one end of the limiting rod 26 are arranged on the outer surface around the rotating disk 21, the electromagnet 25 in the mounting groove 24 is started, and the limiting rod 26 is driven to move upward through the magnetic attraction of the electromagnet 25, so that the bottom end of the limiting rod 26 is disengaged from the limiting groove 22 on the surface of the rotating disk 21, and the limiting connection between the first connecting disk 2 and the second connecting disk 23 is released.

[0035] The inner wall of the second connecting disk 23 is located above the limiting rod 26 and is fixedly installed with an electromagnet 25. The outer surface of the limiting rod 26 is sleeved with a retaining ring 27. The outer surface of the limiting rod 26 is located below the retaining ring 27 and is fixedly installed with a retaining plate 28. The outer surface of the limiting rod 26 is located between the retaining plate 28 and the retaining ring 27 and is sleeved with a reset spring 29. When the electromagnet 25 is closed, the reset spring 29 will push the limiting rod 26 downward, so that the limiting rod 26 is inserted into the corresponding limiting groove 22, thereby completing the connection between the first connecting disk 2 and the second connecting disk 23.

[0036] The inner wall of the second connecting disk 23 is located above the limit rod 26 and an electromagnet 25 is fixedly installed thereon. According to the number of segments in the preset feed amount segmentation configuration file of the tool head, the same number of slots are selected in the limit slot 22 as preset slots, and the axial circumferential spacing of the multiple preset slots is determined according to the feed amount difference between the preset feed amount segments. A magnetic ring 221 is embedded in the groove body of each preset groove, and the depth of the magnetic rings in different preset groove bodies is different. A wireless Hall sensor component is embedded in the end of the rod body of the limit rod 26 close to the limit slot 22. The ejection timing of the electromagnet 25 is controlled based on the output of the wireless Hall sensor component and the preset feed amount segmentation configuration file. The wireless Hall sensor component and the preset feed amount segmentation configuration file are integrated in an external controller, which is connected to the motor 11, wherein each feed amount segment corresponds to a unique Hall sensor output value, and the external controller is connected to the electromagnet 25.

[0037] This design makes it unnecessary to set up a rotary clutch in the present invention. By using magnetic rings with different axial spacings and built-in depths corresponding to preset configuration files, the dual cutter heads can each reach the preset target position without the precise coordination of dual rotary encoders and the involvement of a synchronous controller, and can perform homing and initial adjustment of the preset feed amount with high reliability.

[0038] The specific implementation method is as follows: when it is necessary to adjust the tool holders 33 on both sides synchronously, the motor 11 at one end of the main seat 1 can be started, and the first screw rod 13 and the second screw rod 14 can be driven to rotate by the motor 11. The first screw rod 13 and the second screw rod 14 are symmetrically arranged and threadedly connected to the slider 31, thereby driving the tool holder 33 to move symmetrically along the slide groove 12. When it is necessary to adjust the tool holder 33 on one side separately, the electromagnet 25 in the installation groove 24 can be started, and the magnetic force of the electromagnet 25 can be used to attract and drive the limit rod 26 to move upward, so that the bottom end of the limit rod 26 is disengaged from the limit groove 22 on the surface of the turntable 21, and the tool holder 33 is released. In addition to the limiting connection between the first connecting disk 2 and the second connecting disk 23, the connection between the first screw 13 and the second screw 13 is disconnected, and then the motor 11 is started to drive the first screw 13 to rotate, so that the tool holder 33 on the first screw 13 slides and adjusts along the slide groove 12 on the main seat 1. When the limiting rod 26 moves upward, the baffle 28 will squeeze the reset spring 29. When reconnection is required, the electromagnet 25 can be closed, and the reset spring 29 will push the limiting rod 26 downward, so that the limiting rod 26 is inserted into the corresponding limiting groove 22, completing the connection between the first connecting disk 2 and the second connecting disk 23.

[0039] according to Figure 5-7The double tool holder structure for a CNC machine tool shown in the figure includes a mounting seat 3, wherein the mounting seat 3 is in two groups and the two groups are arranged on both sides of the top of the main seat 1, a slider 31 is fixedly installed at the bottom end of the mounting seat 3, and the slider 31 is respectively sleeved on the outer surfaces of the first screw rod 13 and the second screw rod 14, and the slider 31 is threadedly connected to the first screw rod 13 and the second screw rod 14 respectively, a tool holder 32 is fixedly installed at the top end of the mounting seat 3, and a tool holder 33 for fixing the tool is fixedly installed at the top end of the tool holder 32.

[0040] Furthermore, the bottom end of the tool holder 33 is slidably connected to the tool base 32, and a third screw 371 is rotatably installed inside the tool base 32, and the third screw 371 is threadedly connected to the bottom end of the tool holder 33, driving the third screw 371 to rotate, and the third screw 371 is connected to the third screw 371 at the bottom end of the tool holder 33, thereby driving the tool holder 33 to move downward until the pressing plate 35 presses and fixes the surface of the tool.

[0041] Furthermore, the bottom end of the third screw rod 371 is fixedly connected with the second gear 37, and the inside of the knife seat 32 is rotatably installed with the first gear 36 on one side of the second gear 37, and the first gear 36 is meshingly connected with the second gear 37, and the top of the first gear 36 is fixedly installed with a knob 361, and the top of the knob 361 is provided with a groove, and a tool is inserted into the groove at the top of the knob 361, and then the knob 361 is rotated to drive the first gear 36 at the bottom to rotate, and the second gear 37 is rotated through the first gear 36.

[0042] Furthermore, a slot 34 is provided at the top of the inner wall of the tool holder 33, a pressing piece 35 is inserted into the slot 34, and latches 38 are inserted into the four corners of the top of the tool holder 33. The four corners of the outer surface of the pressing piece 35 are provided with mounting holes 351 that match the bottom end of the latch 38, and the bottom end of the latch 38 is inserted into the mounting hole 351. The latch 38 at the top of the tool holder 33 is pulled upward to drive the bottom end of the latch 38 to disengage from the mounting hole 351 on the surface of the pressing piece 35. After the limit on the pressing piece 35 is released, the pressing piece 35 is taken out of the slot 34 and replaced. After the replacement is completed, the latch 38 is reset downward to fix the pressing piece 35.

[0043] The specific implementation method is as follows: when installing the tool, the tool can be placed on the tool seat 32 and below the tool holder 32, and then a tool is inserted into the groove at the top of the knob 361, and then the knob 361 is rotated to drive the first gear 36 at the bottom to rotate, and the first gear 36 drives the second gear 37 to rotate, thereby driving the third screw rod 371 to rotate, and the third screw rod 371 is connected to the third screw rod 371 at the bottom of the tool holder 33, thereby driving the tool holder 33 to move downward until the pressing sheet 35 presses and fixes the surface of the tool. Because the specification of the first gear 36 is smaller than that of the second gear 37, the downward range of the knife holder 33 will be greatly reduced during the rotation of the knob 361, and the accuracy of controlling the descent of the knife holder 33 will be greatly increased. When the pressing plate 35 is replaced regularly, the pin 38 at the top of the knife holder 33 is first pulled upward to drive the bottom end of the pin 38 to disengage from the mounting hole 351 on the surface of the pressing plate 35. After the limit on the pressing plate 35 is released, the pressing plate 35 is taken out of the slot 34 and replaced. After the replacement is completed, the pin 38 is reset downward to fix the pressing plate 35.

[0044] Refer to the instruction manual Figure 1-4 If the two cutter heads work in the synchronous mode, that is, the two cutter heads corresponding to the preset configuration file move synchronously, and the workpieces to be processed are the same, when it is necessary to adjust the tool holders 33 on both sides synchronously, the motor 11 at one end of the main seat 1 can be started, and the first screw 13 and the second screw 14 are driven to rotate by the motor 11. The first screw 13 and the second screw 14 are symmetrically arranged and threadedly connected to the slider 31, thereby driving the tool holder 33 to move symmetrically along the slide groove 12. When it is necessary to adjust the tool holder 33 on one side separately, for example, when the target feed amounts on both sides are different, the electromagnet 25 in the installation groove 24 can be started, and the magnetic attraction of the electromagnet 25 drives the limit rod 26 to move upward, so that the bottom end of the limit rod 26 is removed from the surface of the turntable 21. The limiting groove 22 is disengaged, releasing the limiting connection between the first connecting disk 2 and the second connecting disk 23, thereby disconnecting the connection between the first screw 13 and the second screw 13, and then starting the motor 11 to drive the first screw 13 to rotate, so that the tool holder 33 on the first screw 13 slides and adjusts along the slide groove 12 on the main seat 1. If the two tool heads need to return to their positions after completing the operation, the electromagnet is first turned off to control the motor to rotate in the opposite direction, and the tool holder close to the motor side is controlled to reach the maximum feed amount, that is, to the side closest to the motor 11. At this time, the electromagnet 25 is started, and then the motor is started and reversed until the tool holder away from the motor side reaches the original zero position, and then the electromagnet 25 is disconnected, and then the motor continues to rotate until the tool holder close to the motor 11 side also returns to the original zero position;

[0045] Specifically, when performing differentiated double-cutter head feed adjustment, for example, the cutter head on the motor side needs to be fed ahead, it is especially suitable for control scenarios where the two cutter heads have a fixed difference in feed amount, such as the inside of a workpiece needs to be processed by two cutter heads at the same time or the feed amount of the two cutter heads needs to maintain a difference of 5mm. First, when the two cutter heads are placed at the original zero position, the electromagnet is kept closed, and then the motor 11 is controlled to rotate. During the rotation process, the output of the Hall sensor is monitored at all times. The output value of the Hall sensor changes all the time. When the output value of the Hall sensor reaches the feed amount segment in the preset configuration file, the motor stops rotating. At this time, the bottom end of the limit rod 26 is just at the target position. The limit slot is marked, that is, above the target preset slot. At this time, the electromagnet module 25 is started and then the motor 11 is turned on. Then the two cutter heads reach the target position under the rotation drive of the motor. At this time, the target feed difference of the two cutter heads at any position is fixed, and there is no need to synchronize and compare the two rotary encoders. If each operation requires a positive feed difference, then in the subsequent homing operation, only the cutter head away from the motor 11 side needs to return to the original zero position. The original zero position is the position where the tool holder 33 is closest to the first connecting disk 2 and the second connecting disk 23; the above operation is suitable for the feed amount of the near side of the motor 11 is greater than the feed amount of the cutter head on the farther side, that is, the positive feed amount operation. If it is necessary to operate the feed amount of the near side of the motor 11 to be smaller than the feed amount of the tool head on the farther side, perform the following operations: first, after both tool heads return to their original zero positions, start the electromagnet 25, and after the motor 11 rotates to drive the two tool holders 33 to move away from each other at a suitable distance, disconnect the electromagnet 25, and rotate the motor 11 in the opposite direction. During this process, the output signal of the Hall sensor assembly is monitored at all times. When the output signal reaches the segmented amount in the preset configuration file, turn off the motor 11, start the electromagnet 25, and then start the motor and reverse until both reach the target position. After that, the tool heads on the two tool holders 33 have a fixed negative feed amount.

[0046] Refer to the instruction manual Figure 5-7 When installing the tool, the tool can be placed on the tool seat 32, and below the tool holder 32, and then a tool can be inserted into the groove at the top of the knob 361, and then the first gear 36 at the bottom is driven to rotate by turning the knob 361, and the second gear 37 is driven to rotate by the first gear 36, thereby driving the third screw 371 to rotate, and the third screw 371 is connected to the third screw 371 at the bottom of the tool holder 33, thereby driving the tool holder 33 to move downward until the pressing piece 35 presses and fixes the surface of the tool. Because the specification of the first gear 36 is smaller than that of the second gear 37, the downward amplitude of the tool holder 33 will be greatly reduced during the rotation of the knob 361, thereby greatly increasing the accuracy of controlling the descent of the tool holder 33.

[0047] Therefore, there is no need to set up a rotary clutch in the present invention. By using magnetic rings with different axial spacings and built-in depths corresponding to the preset configuration files, the double cutter heads can each reach the preset target position without the precise coordination of the dual rotary encoders and the involvement of the synchronous controller, and the homing and initial adjustment of the preset feed amount can be performed with high reliability.

Claims

1. A double tool rest structure for a CNC machine tool, characterized in that: include: A main seat (1), wherein a slide groove (12) is provided on the outer surface of the top end of the main seat (1), a first screw rod (13) and a second screw rod (14) are provided at both ends of the inner wall of the slide groove (12), and the first screw rod (13) and the second screw rod (14) are arranged symmetrically, and a rotating shaft (15) is fixedly installed at one end of the second screw rod (14), a connecting component is provided between the first screw rod (13) and the second screw rod (14), and the first screw rod (13) and the second screw rod (14) are connected through the connecting component, and a motor (11) is fixedly installed at one end of the main seat (1); A mounting seat (3), wherein the mounting seat (3) is provided in two groups, and the two groups are arranged on both sides of the top of the main seat (1); a slider (31) is fixedly installed at the bottom end of the mounting seat (3), and the slider (31) is respectively sleeved on the outer surface of the first screw rod (13) and the second screw rod (14); the slider (31) is respectively threadedly connected to the first screw rod (13) and the second screw rod (14); a knife seat (32) is fixedly installed at the top end of the mounting seat (3); and a knife holder (33) for fixing a knife is fixedly installed at the top end of the knife seat (32); The connection assembly comprises a first connection disk (2) fixedly mounted on one end of a first screw rod (13) and a second connection disk (23) fixedly mounted on one end of a second screw rod (14); a rotating disk (21) is fixedly mounted on one end of the first connection disk (2), and the first connection disk (2) is rotatably connected to the second connection disk (23) via the rotating disk (21); a limiting assembly is arranged inside the second connection disk (23); the limiting assembly comprises a mounting groove (24) provided on the outer surface of the top end of the second connection disk (23); a limiting rod (26) is arranged inside the mounting groove (24); and a plurality of limiting grooves (22) matching one end of the limiting rod (26) are arranged on the outer surface around the rotating disk (21); The inner wall of the second connecting disk (23) is located above the limit rod (26) and is fixedly mounted with an electromagnet (25). According to the number of segments in the preset feed amount segmentation configuration file of the tool head, the same number of slots are selected in the limit slot (22) as preset slots, and the axial circumferential spacing of the plurality of preset slots is determined according to the feed amount difference between the preset feed amount segments. A magnetic ring (221) is embedded in the slot body of each preset slot, and the depth of the magnetic rings in different preset slots is different. A wireless Hall sensor component is embedded in the end of the limit rod (26) near the limit slot (22), wherein each feed amount segment corresponds to a unique Hall sensor output value, and the ejection timing of the electromagnet (25) is controlled based on the output of the wireless Hall sensor component and the preset feed amount segmentation configuration file. The wireless Hall sensor component and the preset feed amount segmentation configuration file are integrated in an external controller, which is connected to the motor (11), and the external controller is connected to the electromagnet (25).

2. The double tool rest structure for a CNC machine tool according to claim 1, characterized in that: One end of the output shaft of the motor (11) is fixedly connected to one end of the first screw rod (13).

3. The double tool rest structure for a CNC machine tool according to claim 1, characterized in that: The first connection disk (2) and the second connection disk (23) are fixedly connected via a limiting assembly.

4. The double tool rest structure for a CNC machine tool according to claim 3, characterized in that: The number of the limiting grooves (22) is 12-16.

5. The double tool rest structure for a CNC machine tool according to claim 4, characterized in that: The outer surface of the limiting rod (26) is sleeved with a retaining ring (27); a retaining plate (28) is fixedly mounted on the outer surface of the limiting rod (26) below the retaining ring (27); and a return spring (29) is sleeved on the outer surface of the limiting rod (26) between the retaining plate (28) and the retaining ring (27).

6. The double tool rest structure for a CNC machine tool according to claim 1, characterized in that: The bottom end of the tool holder (33) is slidably connected to the tool base (32); a third screw rod (371) is rotatably mounted inside the tool base (32), and the third screw rod (371) is threadedly connected to the bottom end of the tool holder (33).

7. The double tool rest structure for a CNC machine tool according to claim 6, characterized in that: The bottom end of the third screw rod (371) is fixedly connected to the second gear (37), and a first gear (36) is rotatably mounted on one side of the second gear (37) inside the knife seat (32), and the first gear (36) is meshingly connected with the second gear (37), and a rotating knob (361) is fixedly mounted on the top end of the first gear (36), and a groove is formed at the top end of the rotating knob (361).

8. The double tool rest structure for a CNC machine tool according to claim 1, characterized in that: A slot (34) is provided at the top end of the inner wall of the tool holder (33), and a pressing sheet (35) is inserted into the slot (34).

9. The double tool rest structure for a CNC machine tool according to claim 8, characterized in that: Pins (38) are inserted into the four corners of the top end of the tool holder (33), and mounting holes (351) matching the bottom end of the pins (38) are opened at the four corners of the outer surface of the pressing plate (35), and the bottom end of the pins (38) is inserted into the mounting holes (351).

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