Electric cutter locking device for preventing CNC cutter handle nut from being excessively locked

Abstract

The invention relates to the technical field of milling cutter installation, in particular to an electric cutter locking device for preventing a CNC cutter handle nut from being excessively locked. The electric cutter locking device comprises a rotating ring, a shifting block and an installation base used for containing a locking nut and a spring chuck, a rotating groove is formed in the installation base, and the rotating ring is rotationally arranged in the rotating groove; the shifting block is fixedly arranged on the ring wall of the inner side of the rotating ring, the spring chuck is placed in the rotating groove, the locking nut is fixedly arranged on the spring chuck, a shifting groove is formed in the locking nut, the shifting block abuts against the interior of the shifting groove, a driving seat is arranged on the side, close to the mounting seat, of the shifting block, and the driving seat is arranged on the side, close to the mounting seat, of the spring chuck. A first gear is coaxially and fixedly arranged on the ring wall of the outer side of the rotating ring, and a second gear matched with the first gear is rotationally arranged in the driving seat. Manual installation is not needed, the process is simple, convenient and rapid, a tool bit is conveniently locked, meanwhile, the tool bit is prevented from being excessively locked through a quantitative tool locking assembly, and the effect of reducing damage to the tool bit is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of milling cutter installation, in particular to an electric locking device for preventing over-tightening of a CNC cutter handle nut. BACKGROUND

[0002] A milling cutter clamp is a device used to install and fix a milling cutter on a milling machine, which ensures that the milling cutter maintains the correct position and stability during the machining process, thereby achieving precise cutting operation. There are various types of milling cutter clamps, and different clamps are suitable for different types of milling cutters and machining tasks. In the prior art, the milling cutter is usually first installed on a tool holder, and then the tool holder is installed on the milling machine.

[0003] The commonly used tool holder includes a tool holder body, a spring chuck and a locking nut. The spring chuck is conical, and the locking nut is fixedly arranged on the spring chuck. The tool holder is provided with a mounting hole, and the locking nut is threadedly connected to the tool holder. When installing the tool bit, the tool bit is placed in the spring chuck, and then the locking nut is rotated to move towards the side of the tool holder. At this time, the smaller side of the spring chuck enters the mounting hole. With the continuous movement of the locking nut, the larger side of the spring chuck contacts the wall of the mounting hole, so that the spring chuck gradually tightens inward until it tightly holds the tool bit, thereby installing the milling cutter on the tool holder.

[0004] For the above technical conditions, the current method for installing the tool bit is to manually hold a tool to rotate the locking nut, so that the spring chuck clamps the tool bit. This method is complex and inconvenient for the staff to lock the tool bit.

[0005] Therefore, the present application designs an electric locking device for preventing over-tightening of a CNC cutter handle nut to solve the above problems. SUMMARY

[0006] To achieve the above purpose, the present application provides the following technical scheme: an electric locking device for preventing over-tightening of a CNC cutter handle nut, comprising a rotating ring, a poking block, a mounting seat for placing a locking nut and a spring chuck, a rotating groove is formed in the mounting seat, the rotating ring is rotatably arranged in the rotating groove, the poking block is fixedly arranged on the inner side wall of the rotating ring, the spring chuck is placed in the rotating groove, the locking nut is fixedly arranged on the spring chuck, a poking groove is formed in the locking nut, the poking block abuts in the poking groove, a driving seat is arranged near the mounting seat, a first gear is coaxially fixedly arranged on the outer side wall of the rotating ring, a second gear adapted to the first gear is rotatably arranged in the driving seat, and a motor for driving the second gear to rotate is arranged on the driving seat.

[0007] By adopting the above technical scheme, when the tool head is installed, the locking nut is first threadedly connected on the tool holder, the spring collet is located in the mounting hole of the tool holder, the mounting seat is moved, the rotating ring is sleeved on the locking nut, the push block is abutted in the push groove, the motor is driven, the second gear is rotated, the first gear is rotated, the push block rotates with the rotating ring, the locking nut is rotated, the locking nut is rotated towards the tool holder side, the spring collet is contracted and clamped to the tool head, manual installation is not required, the process is simple and fast, and the effect of locking the tool head is achieved.

[0008] Preferably, the driving seat is provided with a quantitative lock tool assembly, the quantitative lock tool assembly comprises a lifting ring, a quantitative ring, a connecting shaft, a rotating shaft sleeve, an installation cavity is formed in the driving seat, the motor is vertically fixed in the installation cavity, the rotating shaft of the motor is coaxially fixed with a connecting rod, the connecting rod is coaxially fixed with a third gear, a support shaft sleeve is fixed in the installation cavity, the connecting shaft is vertically inserted in the support shaft sleeve, a first support plate is fixed on the upper end of the connecting shaft, a placing ring is fixed on the support shaft sleeve, the lower side of the first support plate is placed on the upper surface of the placing ring, a first mounting shaft is vertically fixed on the first support plate, and a fourth gear is coaxially and rotatably arranged on the first mounting shaft; a connecting shaft sleeve is vertically placed on the first support plate, the connecting rod is inserted in the shaft sleeve, a second support plate is fixed on the connecting shaft sleeve, a second mounting shaft is fixed on the second support plate, a fifth gear is coaxially and rotatably arranged on the second mounting shaft, and the fifth gear is engaged with the third gear; the lower side of the rotating shaft sleeve is placed on the placing ring, a sixth gear is coaxially fixed on the connecting shaft sleeve, and the fourth gear is engaged with the sixth gear; the inner side wall of the rotating shaft sleeve is coaxially fixed with a gear ring, the fourth gear is engaged with the gear ring, and the fifth gear is also engaged with the gear ring; the outer side wall of the support shaft sleeve is provided with a thread line, the support shaft sleeve is threadedly connected with a rotating ring, the outer ring wall of the rotating ring is fixed on the inner ring wall of the quantitative ring, a placing cavity is formed in the quantitative ring, a lifting ring is placed in the placing cavity, a placing groove is vertically formed in the lifting ring, an extension spring is placed in the placing groove, the lifting ring is sleeved on the support shaft sleeve, and the upper end of the extension spring abuts against the lifting ring; a ball placing groove is vertically formed in the placing ring, an abutting ball is placed in the ball placing groove, the lower side of the abutting ball is placed on the lifting ring, a abutting groove is formed in the lower side of the rotating shaft sleeve, the abutting groove is arched, and the abutting ball abuts against the abutting groove; a seventh gear is coaxially fixed on the lower end of the connecting shaft, the seventh gear is engaged with the second gear, when the lifting ring moves upward, the pressure of the abutting ball against the abutting groove increases, and when the torsion of the rotating shaft sleeve exceeds the pressure of the abutting ball against the abutting groove, the rotating shaft sleeve rotates.

[0009] By adopting the technical scheme, before the installation of the tool bit, the quantitative ring is rotated according to the specifications of different tool bits, the extension degree of the extension spring is adjusted, the pressure of the extension spring on the lifting plate is adjusted, and then the pressure of the abutting ball on the abutting groove is adjusted; after the driving motor is driven, the connecting rod drives the third gear to rotate, and then drives the fifth gear to rotate; when the fifth gear rotates, the second support plate is driven to rotate, and then the connecting shaft sleeve is driven to rotate, the sixth gear is driven to rotate, and then the fourth gear is driven to rotate, so that the second support plate is driven to rotate, and then the connecting shaft is driven to rotate, and then the seventh gear arranged on the connecting shaft drives the second gear to rotate, so that the first gear is driven to rotate, and the rotation of the rotating ring is realized; when the second gear rotates, the torsion continuously increases, and the abutting ball is abutted in the abutting groove to block the rotating shaft sleeve; at this time, the rotating shaft sleeve does not rotate, and the second gear rotates along the gear ring; when the torsion of the rotating ring exceeds the set value, the connecting shaft no longer rotates, the sixth gear still rotates under the continuous rotation of the fifth gear, the fourth gear rotates in place, drives the clamping ring to rotate, and then drives the rotating shaft sleeve to rotate; at this time, the abutting ball is pressed down the lifting plate under the abutment of the abutting groove, the lifting plate is lifted and moved down, the abutting ball enters the ball groove, the abutting ball no longer blocks the rotating shaft sleeve, the rotating shaft sleeve rotates, the motor enters the idle running, the locking torsion is avoided after reaching the locking, the excessive locking of the tool bit is avoided, and the effect of reducing the damage of the tool bit is achieved.

[0010] Preferably, the fourth gear is provided with a plurality of gears on the first support plate.

[0011] By adopting the above technical scheme, a plurality of fourth gears are arranged, and the stability of the gear ring and the first support plate during rotation is improved.

[0012] Preferably, the fifth gear is provided with a plurality of gears on the second support plate.

[0013] By adopting the above technical scheme, a plurality of fifth gears are arranged, and the stability of the gear ring during rotation is further improved, and the stability of the second support plate is improved.

[0014] Preferably, a plurality of abutting balls are arranged on the placing ring.

[0015] By adopting the above technical scheme, a plurality of abutting balls are arranged on the placing ring.

[0016] Preferably, the quantitative ring is coaxially fixedly provided with an indicating ring, the indicating ring is provided with a quantitative indication, the quantitative indication is provided with a plurality of quantitative indications, the plurality of quantitative indications are circumferentially arranged, the driving seat is provided with an indicating arrow, and the indicating arrow faces the quantitative indication.

[0017] By adopting the technical scheme, different installation torques are required for different tool bits, the indicating ring is rotated, the quantitative indication on the indicating ring is aligned with the indicating arrow, the height of the quantitative ring is reasonably adjusted, and the pressure of the abutting ball on the abutting ball is reasonably adjusted.

[0018] To sum up, the application has the following beneficial technical effects: when the tool bit is installed, the locking nut is first threadedly connected to the tool holder, the spring collet is located in the mounting hole of the tool holder, the mounting seat is moved, the rotating ring is sleeved outside the locking nut, the shifting block is abutted in the shifting groove, the motor is driven, the second gear is rotated, the first gear is rotated, the shifting block rotates with the rotating ring, the locking nut is rotated, the locking nut is rotated towards the tool holder side, the spring collet is contracted to clamp the tool bit, manual installation is not required, the process is simple and fast, and the effect of locking the tool bit is achieved; when the tool bit is locked, the quantitative tool locking assembly is used to avoid excessive locking of the tool bit, and the effect of reducing damage to the tool bit is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0020] Figure 1 It is the overall structure schematic view of the mounting seat in the embodiment; Figure 2 It is the structure schematic view when the shifting block is abutted on the shifting groove in the embodiment; Figure 3 It is the structure schematic view of the rotating ring in the embodiment; Figure 4 It is the installation structure schematic view of the first gear in the embodiment; Figure 5 It is the structure schematic view of the driving seat in the embodiment; Figure 6 It is the structure schematic view of the second support plate in the embodiment; Figure 7 It is the installation structure schematic view of the abutting ball in the embodiment; Figure 8 It is the installation structure schematic view of the connecting shaft in the embodiment; Figure 9 It is the structure schematic view of the rotating shaft sleeve in the embodiment; Figure 10 It is the installation structure schematic view of the lifting ring in the embodiment.

[0021] In the drawings, the components represented by each reference numeral are listed as follows: 1, rotating ring; 2, dial block; 3, locking nut; 4, spring chuck; 5, mounting seat; 6, rotating groove; 7, dial groove; 8, drive seat; 9, first gear; 10, second gear; 11, motor; 12, lifting ring; 13, metering ring; 14, connecting shaft; 15, rotating shaft sleeve; 16, mounting cavity; 17, connecting rod; 18, third gear; 19, support shaft sleeve; 20, placement ring; 21, first support plate; 22, first mounting shaft; 23, fourth gear; 24, connecting shaft sleeve; 25, second support plate; 26, second mounting shaft; 27, fifth gear; 28, rotating ring; 29, placement cavity; 30, lifting ring; 31, placement groove; 32, extension spring; 33, ball placement groove; 34, abutting ball; 35, abutting groove; 36, seventh gear; 37, indicating ring; 38, metering mark; 39, indicating arrow; 40, sixth gear; 41, gear ring. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. Figures 1-10 The present application will be further described in detail.

[0024] A motorized lock tool device for preventing CNC tool handle nut from being locked too tightly, comprising a rotating ring 1, a dial block 2, a mounting seat 5 for placing a locking nut 3 and a spring chuck 4, a rotating groove 6 is formed on the mounting seat 5, the rotating ring 1 is rotationally arranged in the rotating groove 6, the dial block 2 is fixedly arranged on the inner side wall of the rotating ring 1, the spring chuck 4 is placed in the rotating groove 6, the locking nut 3 is fixed on the spring chuck 4, and a dial groove 7 is formed on the locking nut 3; a drive seat 8 is fixedly arranged near one side of the mounting seat 5, a first gear 9 is coaxially fixedly arranged on the outer side wall of the rotating ring 1, a second gear 10 matched with the first gear 9 is rotationally arranged in the drive seat 8, and a motor 11 for driving the second gear 10 to rotate is arranged on the drive seat 8; The driving seat 8 is provided with a quantitative lock knife assembly, the quantitative lock knife assembly includes a lifting ring 12, a quantitative ring 13, a connecting shaft 14, a rotating shaft sleeve 15, the driving seat 8 is provided with an installation cavity 16, the motor 11 is vertically fixed in the installation cavity 16, the rotating shaft of the motor 11 is coaxially fixed with a connecting rod 17, the connecting rod 17 is coaxially fixed with a third gear 18, the installation cavity 16 is fixed with a support shaft sleeve 19, the connecting shaft 14 is vertically inserted in the support shaft sleeve 19, the upper end of the connecting shaft 14 is fixed with a first support plate 21, the support shaft sleeve 19 is fixed with a placing ring 20, the placing ring 20 is sleeved on the connecting shaft sleeve 24, the first support plate 21 is placed on the upper surface of the placing ring 20, the first support plate 21 is vertically fixed with a first mounting shaft 22, the first mounting shaft 22 is coaxially rotatably provided with a fourth gear 23; The first support plate 21 is vertically placed with a connecting shaft sleeve 24, the connecting rod 17 is inserted in the connecting shaft sleeve 24, the connecting shaft sleeve is coaxially arranged with the first support plate, the connecting shaft sleeve 24 is fixed with a second support plate 25, the second support plate 25 is fixed with a second mounting shaft 26, the second mounting shaft 26 is coaxially rotatably provided with a fifth gear 27, the fifth gear 27 is engaged with the third gear 18; the lower side of the rotating shaft sleeve 15 is placed on the placing ring 20, the connecting shaft sleeve 24 is coaxially fixed with a sixth gear 40, the second support plate 25 is located between the fourth gear 23 and the fifth gear 27, the fourth gear 23 is engaged with the sixth gear 40; the inner side wall of the rotating shaft sleeve 15 is coaxially fixed with a sixth gear 41, the fourth gear 23 is engaged with the sixth gear 41, and the fifth gear 27 is also engaged with the sixth gear 41, the fourth gear 23 and the fifth gear 27 are located in the sixth gear 41, the fourth gear 23 is provided with a plurality of on the first support plate 21, the sixth sixth gear 41 rotates to drive a plurality of fourth gears 23 to rotate, the fifth gear 27 is provided with a plurality of on the second support plate 25, the third gear 18 rotates to drive a plurality of fifth gears 27 to rotate; The outer side wall of the support shaft sleeve 19 is provided with a thread, the support shaft sleeve 19 is threadedly connected with a rotating ring 28, the outer ring wall of the rotating ring 28 is fixed on the inner ring wall of the quantitative ring 13, the quantitative ring 13 is provided with a placing cavity 29, the placing cavity 29 is placed with a lifting ring 30, the lifting ring 30 is vertically provided with a placing groove 31, the placing groove 31 is placed with a telescopic spring 32, the lifting ring 12 is sleeved on the support shaft sleeve 19, the upper end of the telescopic spring 32 abuts against the lifting ring 12; the placing ring 20 is vertically provided with a ball placing groove 33, the ball placing groove 33 is placed with an abutting ball 34, the lower side of the abutting ball 34 is placed on the lifting ring 12, the lower side of the rotating shaft sleeve 15 is provided with an abutting groove 35, the abutting groove 35 is arc-shaped, the abutting ball 34 abuts against the abutting groove 35, and the abutting ball 34 is placed with a plurality of on the placing ring 20; the lower end of the connecting shaft 14 is coaxially fixed with a seventh gear 36, and the seventh gear 36 is engaged with the second gear 10; Before the cutter head is installed, the locking nut 3 is threaded on the cutter seat in advance, then the mounting seat 5 is moved, the rotating ring 1 is sleeved on the locking nut 3, the push block 2 is abutted in the push groove 7, and the quantitative ring 13 is rotated according to different specifications of the cutter head, so that the extension degree of the extension spring 32 is adjusted, the pressure of the extension spring 32 on the lifting plate is adjusted, and the pressure of the abutting ball 34 on the abutting groove 35 is adjusted. The driving motor 11 drives the connecting rod 17 to rotate, the connecting rod 17 drives the third gear 18 to rotate, and then drives the fifth gear 27 to rotate. When the fifth gear 27 rotates, the abutting ball 34 abuts against the abutting groove 35, at this time, the rotating shaft sleeve 15 cannot rotate, the fifth gear 27 rotates along the snap ring while rotating by itself, drives the second support plate 25 to rotate, and then drives the connecting shaft sleeve 24 to rotate, drives the sixth gear 40 to rotate, and then drives the fourth gear 23 to rotate. The fourth gear 23 rotates along the snap ring while rotating by itself, so as to drive the second support plate 25 to rotate, then drive the connecting shaft 14 to rotate, and then the seventh gear 36 arranged on the connecting shaft 14 drives the second gear 10 to rotate, so as to drive the first gear 9 to rotate, and realize the rotation of the rotating ring 1. When the rotating ring 1 rotates, the push block 2 abuts against the push groove 7, drives the locking nut 3 to rotate, and moves the locking nut 3 to the side of the cutter seat. With the continuous movement, the spring collet 4 is gradually tightened under the abutment of the mounting hole of the cutter seat, clamps the cutter head to lock the cutter. With the locking, the required torque of the locking nut 3 is greater, the required torque of the second gear 10 is continuously increased, when the torque of the rotating ring 1 exceeds the set value, that is, when the pressure of the abutting ball 34 clamping the abutting groove 35 exceeds, at this time, the connecting shaft 14 no longer continues to rotate, under the continuous rotation of the fifth gear 27, the sixth gear 40 still rotates by itself, the fourth gear 23 also rotates by itself, drives the snap ring to rotate, at this time, the pressure of the abutting ball 34 on the abutting groove 35 is less than the torque of the rotating shaft sleeve 15, the arched abutting groove 35 presses the abutting ball 34 into the ball placing groove 33, the abutting ball 34 presses the lifting plate downward, the lifting plate moves downward, the rotating shaft sleeve 15 rotates, the rotating shaft sleeve 15 rotates, the motor 11 enters the idle state, and manual installation is not required. The process is simple and fast, the cutter head is locked, the quantitative cutter locking assembly is used to avoid continuous locking after the locking torque is reached when the cutter is locked, the excessive locking of the cutter head is avoided, and the damage of the cutter head is reduced.

[0025] A plurality of quantitative indications 38 are arranged on the indicating ring 37, and the plurality of quantitative indications 38 are arranged circumferentially. An indicating arrow 39 is arranged on the driving seat 8, and the indicating arrow 39 is directed to the quantitative indications 38; here, the locking milling cutter needs a torque of 20N (N is the unit of force, Newton), before locking, the quantitative ring 13 is rotated, and the indicating arrow 39 is directed to 20 corresponding to the quantitative indications 38, at this time, the resistance of the plurality of abutting balls 34 to the rotating shaft sleeve 15 is 20N, when the torque exceeds 20N during locking, the abutting balls 34 will no longer block the rotating shaft sleeve 15; When the torque of the locking milling cutter changes from 15N to 20N, the quantitative ring 13 is rotated in advance from 15 to 20, and the indicating arrow 39 is directed to 20, during the rotation of the quantitative ring 13, the rotating ring 28 moves upward along the support shaft sleeve 19, when the quantitative ring 13 moves upward, the lifting ring 30 is driven to move upward, the distance between the lifting ring 30 and the lifting plate is shortened, the telescopic spring 32 is compressed, the pressure on the lifting plate is increased, and thus the pressure of the abutting ball 34 on the abutting groove 35 is adjusted to meet the torque adjustment during locking.

[0026] A plurality of fourth gears 23 are arranged to improve the stability of the sixth gear 41 and the first support plate 21 during rotation; a plurality of fifth gears 27 are arranged to further improve the stability of the sixth gear 41 during rotation, and to improve the stability of the second support plate 25; according to actual use needs, the tool holder is usually placed on a tool holder frame for fixation, and the mounting seat 5 can be arranged on a lifting seat with lifting function, and during use, the lifting seat is lowered, and the rotating ring 1 on the mounting seat 5 is sleeved on the locking nut 3.

[0027] The implementation principle of the embodiment is as follows: before locking the tool, the locking nut 3 is pre-screwed on the tool holder, the spring collet 4 is located in the mounting hole of the tool holder, the mounting seat 5 is moved, the rotating ring 1 is sleeved on the locking nut 3, and the push block 2 is abutted in the pushing groove 7; the quantitative ring 13 is rotated to the corresponding position according to the required torque for locking the tool, after adjusting the resistance of the abutting ball 34 to the rotating shaft sleeve 15, the motor 11 is driven to rotate the second gear 10, and then the first gear 9 is rotated, the push block 2 rotates with the rotating ring 1, the locking nut 3 is rotated, the locking nut 3 is rotated towards the tool holder side, the spring collet 4 is contracted to clamp the tool bit, manual installation is not required, the process is simple and fast, and the effect of locking the tool bit is achieved; when the torque of the rotating ring 1 to the locking nut 3 exceeds the set value during locking of the tool bit, the rotating shaft sleeve 15 rotates, and the motor 11 enters idle running, thereby effectively avoiding overlocking of the tool bit, and achieving the effect of reducing damage to the tool bit.

[0028] In the description of the application, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0029] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screwed" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited, the above-mentioned terms in the present application can be understood according to the specific meaning in the specific circumstances by those skilled in the art.

[0030] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An electric tool locking device for preventing over-tightening of CNC tool holder nuts, characterized in that: The device includes a rotating ring (1), a lever (2), and a mounting base (5) for placing a locking nut (3) and a spring collet (4). The mounting base (5) has a rotating groove (6). The rotating ring (1) is rotatably disposed in the rotating groove (6). The lever (2) is fixedly disposed on the inner ring wall of the rotating ring (1). The spring collet (4) is placed in the rotating groove (6). The locking nut (3) is fixedly disposed on the spring collet (4). The locking nut (3) has a lever groove (7). The lever (2) abuts against the lever groove (7). A drive seat (8) is disposed near the mounting base (5). A first gear (9) is coaxially fixedly disposed on the outer ring wall of the rotating ring (1). A second gear (10) adapted to the first gear (9) is rotatably disposed in the drive seat (8). A motor (11) for driving the second gear (10) to rotate is disposed on the drive seat (8).

2. The electric tool locking device for preventing over-tightening of CNC tool holder nuts according to claim 1, characterized in that: A metering lock knife assembly is provided on the drive base (8). The metering lock knife assembly includes a lifting ring (12), a metering ring (13), a connecting shaft (14), and a rotating bushing (15). An installation cavity (16) is provided in the drive base (8). The motor (11) is vertically fixed in the installation cavity (16). A connecting rod (17) is coaxially fixed on the rotating shaft of the motor (11). A third gear (18) is coaxially fixed on the connecting rod (17). A support bushing (19) is fixed in the installation cavity (16). The connecting shaft (14) is vertically inserted into the support bushing (19). A first support plate (21) is fixed on the upper end of the connecting shaft (14). The support bushing (19) has a first support plate (21) fixed on its upper end. A placement ring (20) is fixedly provided. The lower side of the first support plate (21) is placed on the upper surface of the placement ring (20). A first mounting shaft (22) is fixedly provided on the first support plate (21). A fourth gear (23) is coaxially rotatably provided on the first mounting shaft (22). A connecting bushing (24) is vertically placed on the first support plate (21). The connecting rod (17) is inserted into the connecting bushing (24). A second support plate (25) is fixedly provided on the connecting bushing (24). A second mounting shaft (26) is fixedly provided on the second support plate (25). A fifth gear (27) is coaxially rotatably provided on the second mounting shaft (26). The fifth gear (27) and the third gear (17) are connected to each other. 8) Meshing; the lower side of the rotating bushing (15) is placed on the placement ring (20), and the sixth gear (40) is coaxially fixed on the connecting bushing (24), and the fourth gear (23) meshes with the sixth gear (40); the inner side wall of the rotating bushing (15) is coaxially fixed with a toothed ring (41), and the fourth gear (23) meshes with the toothed ring (41), while the fifth gear (27) also meshes with the toothed ring (41); the outer side wall of the supporting bushing (19) is provided with a thread, and the supporting bushing (19) is threadedly connected to a rotating ring (28), and the outer ring wall of the rotating ring (28) is fixedly set on the inner ring wall of the metering ring (13), and the metering ring (13) has a placement ring. The cavity (29) contains a lifting ring (30), a vertically opening placement groove (31) on the lifting ring (30), a telescopic spring (32) in the placement groove (31), a lifting ring (12) sleeved on a support bushing (19), and the upper end of the telescopic spring (32) abutting against the lifting ring (12); the placement ring (20) contains a vertically opening ball groove (33), abutting ball (34) in the ball groove (33), the lower side of the abutting ball (34) is placed on the lifting ring (12), the lower side of the rotating bushing (15) contains an abutting groove (35), the abutting groove (35) is arched, and the abutting ball (34) abuts against the abutting groove (35);A seventh gear (36) is coaxially fixed at the lower end of the connecting shaft (14). The seventh gear (36) meshes with the second gear (10). When the lifting ring (12) moves upward, the pressure of the abutting ball (34) on the abutting groove (35) increases. When the torque of the rotating bushing (15) exceeds the pressure of the abutting ball (34) against the abutting groove (35), the rotating bushing (15) rotates.

3. The electric tool locking device for preventing over-tightening of the CNC tool holder nut according to claim 2, characterized in that: The fourth gear (23) is provided in multiples on the first support plate (21).

4. The electric tool locking device for preventing over-tightening of the CNC tool holder nut according to claim 1, characterized in that: The fifth gear (27) is provided in multiples on the second support plate (25).

5. The electric tool locking device for preventing over-tightening of CNC tool holder nuts according to claim 1, characterized in that: Multiple of the contact balls (34) are placed on the placement ring (20).

6. The electric tool locking device for preventing over-tightening of the CNC tool holder nut according to claim 2, characterized in that: An indicator ring (37) is coaxially fixed on the quantitative ring (13). A quantitative mark (38) is provided on the indicator ring (37). Multiple quantitative marks (38) are provided and arranged circumferentially. An indicator arrow (39) is provided on the drive seat (8) and the indicator arrow (39) faces the quantitative mark (38).

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