Rotary force transmitter and machine tool

Abstract

The application provides a rotary force transmitter and a machine tool, which comprises a power connection part, a machine tool spindle fixing part, a first clutch mechanism, a screw rod, a screw rod nut and a pull rod connecting shaft, the screw rod nut is matched with the screw rod, the screw rod nut can move forward and backward when the screw rod rotates, one end of the screw rod nut is installed with the pull rod connecting shaft, the driving connection part is located at the input end of the screw rod, the machine tool spindle fixing part is close to the output end of the screw rod, the first clutch mechanism is connected with the power connection part and the screw rod, so that the power connection part and the screw rod are in driving connection or disconnection. The rotary force transmitter provided by the application can be directly sleeved in the machine tool spindle as an associated part, and the structure has better reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chuck driving, in particular to a rotary force transmitter and a machine tool. BACKGROUND

[0002] A chuck is a mechanical device used to clamp workpieces on a machine tool. It uses the radial movement of movable clamping jaws evenly distributed on the chuck body to clamp and position workpieces. A chuck generally consists of a chuck body, movable clamping jaws, and a clamping jaw drive motor assembly. The minimum diameter of the chuck body is 65 mm, and the maximum diameter can reach 1500 mm. There is a through hole in the center for passing through workpieces or bars. The back has a cylindrical or short conical structure, which is directly or through a flange connected to the end of the main shaft of the machine tool. Chucks are usually installed on lathes, cylindrical grinding machines, and internal grinding machines for use. They can also be used with various indexing devices on milling machines and drilling machines. The existing mainstream chucks can be divided into manual chucks, pneumatic chucks, and hydraulic chucks based on the power used.

[0003] The existing driving chuck opening and closing mechanism uses a hydraulic station and a high-pressure oil cylinder structure. Although it has been used for a long time and the technology is relatively mature, it requires a motor to compress hydraulic oil to form high pressure to push the chuck to clamp the workpiece during production and use. In this energy conversion process, the energy consumption is high, the cost is high, and the environmental impact is large if the hydraulic oil leaks. SUMMARY

[0004] Therefore, it is necessary to provide a green and environmentally friendly rotary force transmitter with better stability.

[0005] The present application provides a rotary force transmitter, comprising a power connection part, a machine tool spindle fixing part, a first clutch mechanism, a lead screw, and a lead screw nut. The lead screw nut is matched with the lead screw, and can move forward and backward when the lead screw rotates. The drive connection part is located at the input end of the lead screw, and the machine tool spindle fixing part is close to the output end of the lead screw. The first clutch mechanism connects or disconnects the power connection part and the lead screw.

[0006] Preferably, the rotary force transmitter further comprises a pull rod connecting shaft, one end of the lead screw nut is installed with the pull rod connecting shaft, and part of the first clutch mechanism is connected with the power connection part and part is connected with the lead screw.

[0007] Preferably, the rotary force transmitter further comprises a second clutch mechanism, part of the second clutch mechanism is connected with the machine tool spindle fixing part and part is connected with the lead screw, so that the machine tool spindle fixing part drives the lead screw to rotate when the machine tool spindle fixing part rotates; or

[0008] The rotary force transmitter comprises a self-locking connecting piece, and the machine tool spindle fixing part and the lead screw are connected or disconnected by the self-locking connecting piece.

[0009] Preferably, the rotary force transmitter further comprises a speed reducer, the speed reducer is arranged between the first clutch mechanism and the screw rod, the input end of the speed reducer is in driving connection or disconnection with the power connection part through the first clutch mechanism, and the output end of the speed reducer is connected with the screw rod.

[0010] Preferably, the rotary force transmitter further comprises a second clutch mechanism, the second clutch mechanism is arranged between the input end of the speed reducer and the power connection part, and the input end of the speed reducer is in driving connection or disconnection with the machine tool spindle fixed part through the second clutch mechanism.

[0011] Preferably, the rotary force transmitter further comprises a main shell, one end of the main shell is used for fixedly mounting the machine tool spindle, the other end is fixed with the shell of the speed reducer, a part of the second clutch mechanism is fixed with the shell of the speed reducer, another part of the second clutch mechanism is fixed with the input end of the speed reducer, the second clutch mechanism has an attraction state or a disconnection state, when in the attraction state, the machine tool spindle rotates synchronously with the main shell, the shell of the speed reducer and the input end of the speed reducer in sequence, and when in the disconnection state, the shell of the speed reducer and the input end of the speed reducer are disconnected from the synchronous rotation connection.

[0012] Preferably, the rotary force transmitter further comprises a protective shell, and the screw rod, the screw rod nut, the speed reducer, the first clutch mechanism and the second clutch mechanism are arranged on the protective shell.

[0013] Preferably, the protective shell is further provided with a positioning mechanism, the screw rod, the speed reducer, the first clutch mechanism and the second clutch mechanism are arranged coaxially with the main shell, and the positioning mechanism is used for adjusting the position of the main shell and the protective shell and adapting the coaxial centers of the main shell and the protective shell.

[0014] The rotary force transmitter further comprises a magnetic induction device, one part of the magnetic induction device is fixedly arranged on the protective shell, and another part moves synchronously with the screw rod nut in the axial direction, and the magnetic induction device is used for limiting the axial stroke of the screw rod nut.

[0015] Preferably, the input end of the speed reducer is provided with a speed reduction input shaft, the first clutch mechanism comprises a first clutch piece, a first rotating seat and a first magnetic force seat, the second clutch mechanism comprises a second clutch piece, a second rotating seat and a second magnetic force seat, the first clutch piece is fixed on the power connection part, the second clutch piece is fixed on the shell of the speed reducer, the first rotating seat and the second rotating seat are sleeved and fixed on the speed reduction input shaft, the first magnetic force seat can attract or disconnect the first clutch piece and the first rotating seat, and the second magnetic force seat can attract or disconnect the second clutch piece and the second rotating seat.

[0016] Another aspect of the present invention provides a machine tool, which includes a drive motor assembly, a machine tool body, a chuck, and the aforementioned rotary transmission device. The machine tool body includes a tie rod and a spindle. The rotary transmission device is connected to the tie rod of the machine tool body. The tie rod is used to drive the opening and closing of the chuck's jaws. The drive motor assembly and the rotary transmission device are tractably connected or distractably connected. The rotary transmission device and the spindle of the machine tool body are tractably connected or distractably connected.

[0017] When it is necessary to clamp or release the workpiece, the drive motor assembly and the rotary power transmitter are connected in transmission, and the rotary power transmitter and the spindle of the machine tool body are disconnected in transmission. At this time, the drive motor assembly can drive the pull rod to move back and forth along the axis through the rotary power transmitter, so that the jaws of the chuck open and close.

[0018] When a workpiece needs to be processed, the drive motor assembly and the rotary power transmitter are disengaged from the transmission connection. The rotary power transmitter is connected to the spindle of the machine tool body. When the spindle of the machine tool body rotates, it drives the jaws of the chuck to rotate.

[0019] The rotary power transmitter provided by this invention can be directly installed inside the machine tool spindle as an associated component, and its structure has better reliability. Attached Figure Description

[0020] The above and other objects, features, and advantages of the invention will become clearer through a more detailed description of the preferred embodiments illustrated in the accompanying drawings. The same reference numerals denote the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of the invention.

[0021] Figure 1 This is a schematic diagram of the machine tool mechanism provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the machine tool provided by the present invention;

[0023] Figure 3 This is an enlarged schematic diagram of part A in Figure 2;

[0024] Figure 4 This is a schematic diagram of the rotary force transmitter structure provided by the present invention;

[0025] Figure 5 for Figure 4 Enlarged schematic diagram of section B;

[0026] Figure 6 for Figure 4 Enlarged schematic diagram of section C in the middle;

[0027] Figure 7 This is another embodiment of the present invention;

[0028] Figure 8 For Figure 7 Partial structure amplification schematic diagram;

[0029] Figure 9 For Figure 7 Partial structure amplification schematic diagram;

[0030] Figure 10 The transition disc structure provided by the application is shown in the schematic diagram.

[0031] Figure 11 The output torque and tension diagram is shown in the schematic diagram.

[0032] Drive motor assembly 1, rotating force transmitter 2, machine tool body 4, motor 11, speed reducer 12, screw rod 21, screw nut 22, pull rod connecting shaft 23, first mounting plate 24, second mounting plate 25, support plate 26, first flange fixing bolt 27, first flange 28, mounting rod 29, nut 30, bearing mounting seat 31, bearing surface flange 32, protective plate 33, machine tool spindle 41, pull rod 42, screw nut mounting sleeve 221, limiting block 222, bearing 311, first magnetic force seat 341, second magnetic force seat 342, first clutch piece 351, second clutch piece 352, first rotating seat 361, second rotating seat 362;

[0033] First clutch mechanism 350, second clutch mechanism 360, elastic force mechanism 363, friction plate 364, friction plate 365, motor mounting bracket 13, output shaft key connection position 14, speed reduction input shaft 121, shaft end nut 122, screw rod tail end bearing 34, bearing compression nut 35, main housing 36, magnetic induction device 37, induction magnetic ring 371, magnetic inductor 372, main shaft housing 43, transition disc 50, housing mounting disc 51, housing flange 52, main housing fastener 53, movable through hole 54, first threaded hole 55, second threaded hole 56, protective housing 60, positioning mechanism 61, second threaded hole 56. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings.

[0035] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element and integrated as a whole, or there can be a middle element. The terms "mounting", "one end", "the other end" and similar expressions used herein are only for illustrative purposes.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this technology belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the present technology. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] Reference Figures 1-6 The present application provides a rotary force transmitter, the rotary force transmitter 2 comprising a first clutch mechanism, a second clutch mechanism, a lead screw 21, a lead screw nut 22, a pull rod connecting shaft 23, a power connecting part, a machine tool spindle fixing part, the power connecting part being used for installing a driving mechanism, the pull rod connecting shaft 23 being used for connecting a pull rod 42, and the machine tool spindle fixing part being used for connecting a spindle 41 of a machine tool.

[0038] The lead screw 21 is installed at the center of the rotary force transmitter 2 through a bearing 311 and serves as a power input shaft, and can provide a pushing / pulling force in synchronization with a speed reducer.

[0039] The lead screw nut 22 is matched with the lead screw 21, and can move forward and backward when the lead screw 21 rotates, and the two are matched to convert rotary motion into linear motion, and one end of the lead screw nut 22 is provided with external threads for installing the pull rod connecting shaft 23. A lead screw nut mounting sleeve 221 is fixedly installed on the bearing mounting seat 31 and is used for radially positioning the lead screw nut and preventing the lead screw nut from rotating with the lead screw, but can slide axially. A limit block 222 is installed on the end face of the lead screw and is used for limiting and preventing the lead screw nut from over-traveling and sliding out and falling off.

[0040] The pull rod connecting shaft 23 is connected to the lead screw nut at one end and is connected to the pull rod 42 in the machine tool spindle 41 at the other end in a threaded manner, and is used for transmitting a pushing / pulling force.

[0041] The power connecting part comprises a first mounting plate 24, which is used for installing a speed reducer of a driving mechanism.

[0042] The machine tool spindle fixing part comprises a bearing mounting seat 31, a bearing 311, and a bearing face flange 32. The bearing mounting seat 31 is sleeved on the input end side of the lead screw and is fixedly installed on the pulley flange by bolts, and the inside thereof is used for installing and positioning the bearing 311. The bearing 311 is installed in the bearing mounting seat 31 and is sleeved on the input end of the lead screw, and is used for ensuring smooth rotation of the lead screw and simultaneously bearing axial tension when the tool is clamped or loosened. In this embodiment, a face thrust ball bearing 311 is adopted, and other bearings 311 such as a self-aligning roller bearing 311 can also be adopted. The bearing face flange 32 is fixedly installed on the bearing mounting seat 31 by bolts and can press and position the bearing 311.

[0043] The rotary force transmitter of the present application further comprises a second mounting plate 25, a support plate 26, a first flange fixing bolt 27, a first flange 28, and a protective plate 33.

[0044] The second mounting plate 25 is fixedly connected to the machine tool spindle 41 mounting seat through the mounting rod 29 and the nut 30. The support plate 26 is used to fix the first mounting plate 24 and the second mounting plate 25. The first flange fixing bolt 27 is installed on the first flange 28, which can be multiple or single, and the first flange 28 is fixed on the reducer output shaft and can rotate with the reducer. The mounting rod and the nut fix the second mounting plate 25 with the machine tool body 4. The protective plate 33 cooperates with the support plate 26 to form a protective cover to prevent foreign objects from falling into the interior.

[0045] In the preferred embodiment, the first clutch mechanism and the second clutch mechanism can adopt electromagnetic clutch or mechanical clutch.

[0046] In the further preferred embodiment, the first clutch mechanism and the second clutch mechanism each include a magnetic base and a clutch element that can be connected or separated from each other. The magnetic base of the first clutch mechanism is referred to as the first magnetic base 341, and the magnetic base of the second clutch mechanism is referred to as the second magnetic base 342. The connection or separation of the clutch element is controlled by energizing or de-energizing the magnetic base. The magnetic base has an electromagnetic coil that can be energized, and the clutch element can be controlled to be attracted or not attracted by energizing or de-energizing the electromagnetic coil.

[0047] In the preferred embodiment, the first clutch mechanism and the second clutch mechanism can adopt a normally open structure or a normally closed structure. In the normally open structure, the magnetic base is energized to connect the clutch element, and the clutch element is separated when the magnetic base is not energized. In the normally closed structure, the magnetic base is energized to separate the clutch element, and the clutch element is connected when the magnetic base is not energized.

[0048] In the normally closed structure, the consumption of electrical energy can be reduced, the stability of clamping during processing can be improved, and the workpiece can be effectively clamped and not loose and fall off in the case of sudden power failure during workpiece clamping and rotation.

[0049] Reference Figure 4 In the preferred embodiment, the magnetic bases of the first clutch mechanism and the second clutch mechanism are fixed on both sides of the second mounting plate 25 and do not move with the lead screw 21 of the rotary force transmitter 2.

[0050] Reference Figures 4-5In the preferred embodiment, the clutch member of the first clutch mechanism specifically comprises a first clutch plate 351 fixed to the driving motor assembly 1 and a first rotating seat 361 sleeved on the lead screw 21 of the rotary force transmitter 2 and rotatable with the lead screw 21. The first magnetic seat 341 can control the attraction between the first clutch plate 351 and the first rotating seat 361, so that the driving motor assembly 1 and the lead screw 21 are drivingly connected. Specifically, the first clutch plate 351 is fixedly installed on the first flange 28 and made of a material with good magnetic conductivity. When the first clutch plate 351 is disconnected from the first rotating seat 361, the first clutch plate 351 and the first rotating seat 361 have a spacing of 0.1-1 mm, further 0.2-0.4 mm, and more further 0.3 mm, and are independent of each other.

[0051] The first rotating seat 361 is fixedly sleeved on one end of the input shaft of the lead screw 21 by a key, so that the kinetic energy (torque) transmitted through the first clutch plate 351 can be applied to the lead screw 21 to drive the lead screw to rotate. Under the action of the magnetic seat, the first clutch plate 351 can be slightly deformed to be in contact with the end face of the first rotating seat, and the kinetic energy (torque) output by the speed reducer can be transmitted to the first rotating seat 361 through the combined action of magnetic attraction and friction.

[0052] The first clutch mechanism (taking the normally open structure as an example) specifically works as follows:

[0053] Reference Figures 4-6 The first clutch mechanism is installed on the power (torque) input end of the rotary force transmitter 2, the first flange 28 is fixedly coupled with the first clutch plate 351 as a whole and is fixedly installed on the output shaft of the speed reducer. The first rotating seat 361 is fixedly sleeved on the input end of the lead screw to ensure that the two can rotate synchronously, and the end face of the first rotating seat 361 and the end face of the first clutch plate 351 are spaced apart by 0.3 mm. The first electromagnetic magnetic seat is fixedly installed on the second mounting plate 25 and cannot rotate, so it will not rotate with the lead screw of the rotary force transmitter 2. When the first electromagnetic magnetic seat is powered on to generate an electromagnetic attraction, the end face of the first rotating seat 361 and the end face of the first clutch plate 351 are attracted to each other (the distance is 0) as a whole component. At this time, the power (torque) transmitted through the speed reduction can directly act on the lead screw to drive the lead screw to rotate, thereby further driving the lead screw nut to slide forward and backward. When the first electromagnetic magnetic seat is powered off, the magnetic force disappears, the end face of the first rotating seat 361 and the end face of the first clutch plate 351 restore to a spacing of 0.3 mm, at which time the two are independent of each other and act independently of each other.

[0054] Reference Figures 4-6, preferably, the rotary force transmitter 2 and the spindle 41 of the machine tool body 4 are connected or disconnected by a second clutch mechanism, which comprises a second clutch plate 352, a second rotary seat 362 and a second magnetic seat 342. The second clutch plate 352 is connected to the spindle 41 of the machine tool body 4. The second rotary seat 362 is sleeved on the lead screw 21 of the rotary force transmitter 2 and can rotate with the lead screw 21. When the second magnetic seat 342 is powered on or off, the second clutch plate and the second rotary seat 362 are attracted, so that the rotary force transmitter 2 and the spindle 41 of the machine tool body 4 are connected. After the second clutch plate and the second rotary seat 362 are disconnected, the second clutch plate and the second rotary seat 362 have a spacing of 0.1-1mm, further 0.2-0.4mm.

[0055] The second rotary seat 362 is fixedly sleeved on the one end of the lead screw input shaft and the middle side by a key, and can transmit the kinetic energy (torque) from the lead screw to the second clutch plate.

[0056] The second clutch plate 352 is fixedly installed on the end face flange of the bearing 311, and is made of a material with good magnetic conductivity. When there is no magnetic attraction, the second clutch plate 352 maintains a distance of 0.3mm from the second rotary seat and is not connected to each other. When the second magnetic seat 342 is powered on to generate a magnetic attraction force, the second clutch plate 352 can slightly deform and be attached to the end face of the second rotary seat 362. Through the combined action of the magnetic attraction force and the friction force, the lead screw and the rotary force transmitter are relatively fixed on the machine tool spindle 41, and temporarily integrated as a whole. When the lead screw provides and transmits a pulling force to the pull rod 42 to clamp the workpiece and process, the rotary force transmitter can rotate with the machine tool spindle 41 until the processing is completed. When the processing is completed, the second rotary seat and the second clutch plate 352, and the rotary force transmitter and the machine tool spindle 41 become two relatively movable individuals, respectively.

[0057] The specific working principle of the second clutch mechanism is as follows:

[0058] 1. Normally open structure

[0059] The second magnetic force base 342 is fixedly installed on the second installation plate 25 and cannot rotate, so it will not rotate with the screw rod of the rotary force transmitter 2. When the second magnetic force base 342 is electrified to generate electromagnetic attraction, the end surface of the second rotary base 362 and the end surface of the second clutch piece 352 are attracted to each other (the interval is 0) to form an integral part. At this time, the rotary force transmitter and the machine tool spindle 41 are temporarily coupled as an integral part, and can rotate synchronously with the machine tool spindle 41. When the second magnetic force base 342 is de-energized, the magnetic force disappears, and the end surface of the second rotary base 362 and the end surface of the second clutch piece 352 return to an interval of 0.3 mm. At this time, they are independent of each other and can operate independently without affecting each other, and can realize independent operation of the screw rod in the rotary force transmission part under different conditions of the machine tool spindle 41 being stationary.

[0060] 2. Normally closed structure

[0061] When the workpiece is being processed, the first rotary base 361 and the first clutch piece 351 in the first clutch mechanism are de-energized and separated, and the second rotary base 362 and the second clutch piece 352 in the second clutch mechanism are electrified and attracted to ensure that the rotary force transmission part is coupled with the machine tool spindle 41 as an integral part. When the workpiece processing is completed, the first rotary base 361 and the first clutch piece 351 in the first clutch mechanism are electrified and attracted, and the second rotary base 362 and the second clutch piece 352 in the second clutch mechanism are de-energized and separated by an interval of 0.3 mm to ensure that the rotary force transmitter 2 and the machine tool spindle 41 are temporarily disconnected and can operate independently.

[0062] The rotary force transmission part is designed as an associated rotary force transmitter that is installed inside the machine tool spindle. The main parts can rotate with the spindle, and the axial force generated during the push / pull action will directly act on the machine tool spindle, rather than being borne by the bearing. Therefore, the structure has higher reliability.

[0063] Reference Figures 1-3The embodiment also provides a machine tool, which comprises the rotary force transmitter, the driving mechanism and the machine tool body mentioned in the above embodiment. The driving mechanism comprises the motor 11 and the speed reducer 12. The machine tool body comprises the pull rod 42 and the main shaft 41. When it is needed to clamp or loosen the workpiece, the first clutch mechanism makes the driving motor assembly 1 and the rotary force transmitter 2 in driving connection, and the rotary force transmitter 2 and the main shaft 41 of the machine tool body 4 are in driving disconnection. At this time, the driving motor assembly 1 can drive the pull rod 42 to move forward and backward along the axial direction through the rotary force transmitter 2, so as to open and close the clamping jaw of the chuck. At this time, the rotation of the machine tool main shaft 41 will not affect the rotary force transmitter 2, avoiding the problem of cable winding when the machine tool main shaft 41 rotates at high speed.

[0064] When the workpiece is clamped and the next step of processing the workpiece is needed, the driving motor assembly 1 and the rotary force transmitter 2 are in driving disconnection, so that the driving force of the driving motor assembly 1 will not be transmitted to the rotary force transmitter 2, avoiding the pull rod 42 from being pulled to cause the clamping jaw to open. At this time, the rotary force transmitter 2 and the main shaft 41 of the machine tool body 4 are in driving connection, so that the rotary force transmitter 2 and the machine tool body 4 are combined as a whole. The rotary force transmitter 2 rotates at high speed along with the machine tool main shaft 41, ensuring that the rotary force transmitter 2 will not be loose, avoiding the rotary force transmitter 2 from being loose to cause the pull rod 42 to be pulled to open the clamping jaw.

[0065] Please refer to Figures 7-11 The embodiment also provides another rotary force transmitter.

[0066] The rotary force transmitter 2 comprises the power connection part, the machine tool main shaft 41 fixing part, the first clutch mechanism 350, the lead screw 21 and the lead screw nut 30. The lead screw nut 30 is matched with the lead screw 21. When the lead screw 21 rotates, the lead screw nut 30 can move forward and backward. The driving connection part is located at the input end of the lead screw 21. The machine tool main shaft 41 fixing part is close to the output end of the lead screw 21. The first clutch mechanism 350 makes the power connection part and the lead screw 21 in driving connection or driving disconnection. The speed reducer 12 is arranged between the first clutch mechanism 350 and the lead screw 21. The input end of the speed reducer 12 and the power connection part are in driving connection or driving disconnection through the first clutch mechanism 350. The output end of the speed reducer 12 is connected with the lead screw 21. Through the above arrangement, the service life of the first clutch mechanism is improved, avoiding the first clutch mechanism 350 arranged at the output end of the speed reducer 12 and bearing a higher torsion. For example, if the speed reduction ratio of the speed reducer 12 is 50:1, the torsion is about 50 times larger. If the first clutch mechanism 350 is arranged at the output end of the speed reducer 12 and bears the torsion about 50 times larger.

[0067] In the preferred embodiment, the rotary force transmitter 2 further comprises a second clutch mechanism 360, which is arranged between the input end of the speed reducer 12 and the power connection part, and the input end of the speed reducer 12 is in driving connection or disconnection with the machine tool spindle 41 fixed part through the second clutch mechanism 360. Through the first clutch mechanism 350 and the second clutch mechanism 360, it is ensured that the clamping process and the machine tool spindle 41 rotating process can be disconnected, and the axial force generated when the push / pull action occurs will directly act on the machine tool spindle 41, rather than being borne by the bearing 311, so that the structure of the embodiment has higher reliability. At the same time, it also makes the second clutch mechanism 360 have higher service life.

[0068] Of course, in order to drive connect or disconnect the machine tool spindle 41 and the screw rod 21, other embodiments can use a self-locking connector. For example, the rotary force transmitter 2 comprises a self-locking connector, and the machine tool spindle 41 fixed part and the screw rod 21 are in driving connection or disconnection through the self-locking connector. The self-locking connector can be a self-locking structural part in the speed reducer 12 with self-locking, or the self-locking connector can be a self-locking screw assembly (which comprises a screw rod nut 30 and a screw rod 21 assembly, and comprises a self-locking connector), and the self-locking speed reducer 12 and the self-locking screw assembly are prior art, which will not be further limited here.

[0069] In the preferred embodiment, the rotary force transmitter 2 further comprises a main housing 36, one end of which is used to fixedly install the machine tool spindle 41, and the other end is fixed with the shell of the speed reducer 12. The main housing 36 is installed and fixed on the machine tool spindle 41, and can rotate synchronously with the machine tool spindle 41 at high speed during the machining process; a part of the second clutch mechanism 360 is fixed with the shell of the speed reducer 12, and the other part of the second clutch mechanism 360 is fixed with the input end of the speed reducer 12, which is the speed reduction input shaft 121; the second clutch mechanism 360 has an attraction state or a disconnection state. When in the attraction state, the machine tool spindle 41 rotates synchronously with the main housing 36, the shell of the speed reducer 12 and the input end of the speed reducer 12 (i.e. the speed reduction input shaft 121) in turn. When in the disconnection state, the shell of the speed reducer 12 and the input end of the speed reducer 12 are disconnected from the synchronous rotation connection, i.e. the speed reduction input shaft 121 and the shell of the speed reducer 12, the main housing 36 and the machine tool spindle 41 are disconnected from the driving connection, so as to ensure that the screw rod 21 is disconnected from the driving connection with the above three, and at this time, if the first clutch mechanism 350 is attracted, the motor 11 and the speed reduction input shaft 121 are drivingly connected through the first clutch mechanism 350, and the forward and reverse rotation of the motor 11 can realize the clamping and loosening of the chuck.

[0070] In the preferred embodiment, the rotary force transmitter is further provided with a protective shell 60, the lead screw 21, the lead screw nut 30, the speed reducer 12, the first clutch mechanism 350 and the second clutch mechanism 360 are arranged in the protective shell 60. The protective shell is to prevent dust, water mist and other sundries from entering to protect the components in the rotary force transmitter. The arrangement of the protective shell 60 prevents the lead screw 21, the lead screw nut 30, the speed reducer 12, the first clutch mechanism 350 and the second clutch mechanism 360 from entering dust, and the protective shell 60 improves the service life of these components, and makes the rotary force transmitter 2 suitable for mining or other scenes with more dust. Further, the protective shell 60 does not rotate relative to the machine tool, and does not rotate with the machine tool spindle 41, and is used to connect and install the positioning motor 11 and the non-rotating first magnetic seat 341 and second magnetic seat 342 in the fixed electromagnetic clutch.

[0071] In the preferred embodiment, the protective shell 60 is further provided with a positioning mechanism 61, the lead screw 21, the speed reducer 12, the first clutch mechanism 350 and the second clutch mechanism 360 are arranged coaxially with the main shell 36, and the positioning mechanism is used to adjust the coaxiality of the shaft centers of the above four components with the shaft center of the protective shell 60. The positioning mechanism 61 is used to adjust the positions of the main shell 36 and the protective shell 60 and adapt the shaft centers of the two, generally making the shaft centers of the two on the same straight line.

[0072] The positioning mechanism 61 includes positioning bolts and positioning threaded holes, the positioning bolts and the positioning threaded holes cooperate with each other, the positioning threaded holes pass through the protective shell 60, the positioning threaded holes are arranged circumferentially along the protective shell 60, the positioning bolts pass through the positioning threaded holes and extend into the protective shell, and the positioning bolts support the rotary force transmitter.

[0073] The positioning threaded holes are uniformly distributed on the circumference of the protective shell 60, and the number can be divided into 3 or 4 per group (circle), and 1-3 groups can be configured axially, which is used to ensure that the center of the pull rod 42, the rotating part of the rotary force transmitter and the protective shell 60 can be coaxial during assembly. After the rotary force transmitter and the pull rod 42 are installed on the machine tool body, the positioning bolts of the positioning mechanism can be loosened and fixed in position in the direction of the protective shell 60 to ensure normal rotation of the pull rod 42.

[0074] In the preferred embodiment, the rotary force transmitter 2 further includes a magnetic induction device 37, one part of the magnetic induction device 37 is fixedly arranged in the protective shell 60, and the other part moves axially synchronously with the lead screw nut 30. The magnetic induction device 37 is used to limit the axial stroke of the lead screw nut 30. It ensures convenient installation and debugging, and ensures that the equipment works within the normal stroke.

[0075] The magnetic induction device 37 comprises an induction magnetic ring 371 and a magnetic inductor 372. The induction magnetic ring 371 is fixed on the screw nut 30 which only moves in the axial direction, and the magnetic inductor 372 is installed on the protective shell 60. The induction magnetic ring 371 and the magnetic inductor 372 are used to limit the axial stroke of the electric pull rod 42. Further, the main shell 36 is sleeved on the screw nut 30, and the main shell 36 is provided with a relief hole (not shown in the figure). The induction magnetic ring 371 is connected to the screw nut 30 through a connecting rod (not shown in the figure), and the connecting rod can move in the relief hole.

[0076] In the preferred embodiment, the input end of the speed reducer 12 is provided with a speed reduction input shaft 121. The first clutch mechanism 350 comprises a first clutch plate 351, a first rotating seat 361 and a first magnetic force seat 341. The second clutch mechanism 360 comprises a second clutch plate 352, a second rotating seat 362 and a second magnetic force seat 342. The first clutch plate 351 is fixed on the power connection part, and the second clutch plate 352 is fixed on the shell of the speed reducer 12. The first rotating seat 361 and the second rotating seat 362 are sleeved and fixed on the speed reduction input shaft 121. The first magnetic force seat 341 can attract or separate the first clutch plate 351 and the first rotating seat 361. The second magnetic force seat 342 can attract or separate the second clutch plate 352 and the second rotating seat 362. Further, the first magnetic force seat 341 and the second magnetic force seat 342 are fixed on the protective shell 60. The speed reduction input shaft 121 is sleeved in the two electromagnetic clutches and the speed reducer 12, and is used to transmit torque. The first electromagnetic clutch preferably adopts a normally open structure, and controls the torque input of the motor 11. When the workpiece needs to be clamped, the first electromagnetic clutch is powered to attract and transmit the output torque of the motor 11. After the workpiece is clamped and during the machining process, the first electromagnetic clutch is powered off to separate, so that the main body of the electric pull rod 42 can rotate at a high speed with the main spindle of the machine tool. The first clutch plate 351 is an electromagnetic attraction plate, the first rotating seat 361 and the first clutch plate 351 are made of a material with high friction, and the first magnetic force seat 341 is an electromagnet.

[0077] The second electromagnetic clutch (brake) preferably adopts a normally closed structure, which acts as a brake during the machining process to maintain the clamping force of the pull rod 42. During the clamping process of the workpiece, the second electromagnetic clutch is powered to separate, so that the pull rod 42 and the main spindle of the machine tool can rotate relatively independently to clamp the workpiece. After the workpiece is clamped, the second electromagnetic clutch is powered off to separate, and under the action of the spring, the friction plate is reset to attract, so that the electric pull rod 42 and the main spindle of the machine tool are reconnected to be a synchronous rotating structure. The second electromagnetic clutch preferably adopts a normally closed structure, and the second magnetic force seat 342 is an electromagnet.

[0078] The second clutch plate 352 is an electromagnetic attraction plate, the second rotating seat 362, and the second magnetic force seat 342 are generally electromagnets. The second electromagnetic clutch further comprises a resilient mechanism 363, a friction plate A 364, and a friction plate B 365. The resilient mechanism 363 can be a spring. The friction plate A is located on the left side of the friction plate B. The second clutch plate 352 comprises a clutch plate A and a clutch plate B. Figure 8 The two arrows of the second clutch plate 352 respectively point to the clutch plate A and the clutch plate B, and the clutch plate A is located on the left side of the clutch plate B. Each component of the second electromagnetic clutch has the following structure and effects:

[0079] The electromagnetic attraction plate (the second rotating seat 362) is installed on the reduction input shaft 121 through key connection and can rotate with the shaft. The end face of the electromagnetic attraction plate close to the clutch plate A is provided with a friction position. When the electromagnetic attraction plate is attracted to the clutch plate A, the friction position increases the friction force with the clutch plate A. When the power is off, the friction plate A 364 interacts with the friction plate A 364 to bear the torque of the reduction input shaft 121.

[0080] The clutch plate A is connected with the friction plate A 364 as a whole through bolts, guide columns, and the resilient mechanism 363, and is axially slidably sleeved on the clutch plate B.

[0081] The clutch plate B is fixedly sleeved on the reduction input shaft 121 for installing the clutch plate A, the resilient mechanism 363, and the friction plate A 364, and provides support for the axial movement of the clutch.

[0082] The resilient mechanism 363 is sleeved in the clutch plate B. When the power is off, the resilient mechanism 363 ensures that the friction plate A 364 and the friction plate B 365 are forced to fit under the action of the friction force, and ensures that the rotary force transmitter 2 rotates synchronously with the machine tool spindle 41.

[0083] The friction plate A is connected with the clutch plate A. When the workpiece is machined, the electromagnet is not powered. At this time, the friction plate A 364 is axially pressed against the friction plate B 365 under the action of the resilient mechanism 363, and bears the torque of the machine tool spindle 41. When the machining is completed and the workpiece is clamped, the electromagnet is powered, the clutch plate A slides along the axis to the electromagnet side under the action of the magnetic force, and drives the friction plate A 364 and the friction plate B 365 to separate, so as to separate the machine tool spindle 41 and the rotary force transmitter 2.

[0084] The friction plate B is fixedly installed on the housing of the reduction machine 12, and can be integrated with the housing of the reduction machine 12. The friction plate B is combined with the friction plate A 364 to transmit the torque of the machine tool spindle 41.

[0085] The motor mounting frame 13 is used to mount the motor 11 and connect the motor 11 to the pull rod 42 body. The screw assembly is used to convert the rotary motion input by the motor 11 into axial motion. The housing mounting disc 51 is fixedly mounted on the non-rotating structure at the tail end of the machine tool spindle 41 by bolts, and then the housing of the electric pull rod 42 is fixedly mounted on the mounting disc by bolts, so that the housing of the electric pull rod 42 is fixedly connected to the machine tool. The spindle shell 43 is fixed to the machine tool for mounting the electric spindle or the ordinary spindle. The output shaft key connection position 14 is used to connect with the output end of the motor 11. The shaft end nut 122 is used to be mounted on the input end of the connecting shaft, and the auxiliary limiting electromagnetic clutch is used. In the further preferred embodiment, the pull rod connecting shaft 23 connects the screw nut 30 and the pull rod 42, and the connecting sleeve can also be designed as an integral structure with the screw nut 30 or the pull rod 42.

[0086] The application also provides a transition disc 50, which is provided with two mounting end faces and a movable through hole 54 penetrating through the two mounting end faces, the movable through hole 54 being used for movably penetrating the pull rod 42, the pull rod 42 being movable in the axial direction after penetrating through the movable through hole 54, the pull rod 42 being connected with the pull rod connecting shaft 23 and the screw nut 30 or being integrally provided with the pull rod 42 and the screw nut 30, at this time, the pull rod connecting shaft 23 and the screw nut 30 are regarded as the pull rod 42, and this mode also belongs to the protection scope of the application. The transition disc 50 is also provided with a mounting mechanism, the machine tool spindle 41 and the rotary force transmitter 2 being mounted on the mounting end faces of the transition disc 50 through the mounting mechanism. Because the tail end mounting position structures of the machine tool spindles 41 of various manufacturers are different, the transition disc 50 is designed as a non-uniform part according to the needs, and the pull rod 42 can be adaptively mounted and fixed on different machine tool spindles 41, and the rotary force transmitter 2, the pull rod 42 and the machine tool spindle 41 are coaxial.

[0087] In the preferred embodiment, the mounting mechanism includes a first threaded hole 55 and a second threaded hole 56, the first threaded hole 55 and the second threaded hole 56 penetrating through the two mounting end faces of the transition disc 50, the main shell 36 of the rotary force transmitter 2 being fixedly mounted on the mounting end face of the transition disc 50 through the first threaded hole 55 and the main shell fastener 53, and the machine tool spindle 41 being mounted on the other mounting end face of the transition disc 50 through the second threaded hole 56 and the spindle fastener. The main shell fastener 53 and the spindle fastener are fastening screws. When the machine tool spindle 41 rotates, the transition disc 50 and the main shell 36 rotate synchronously with the machine tool spindle 41. When the pull rod 42 moves in the axial direction, the transition disc 50 does not move with the pull rod 42. On the other hand, when the second clutch mechanism 360 is in the attraction state, the machine tool spindle 41 rotates synchronously with the main shell 36, the transition disc 50, the housing of the speed reducer 12 and the input end of the speed reducer 12 in sequence; when the disconnection state, the housing of the speed reducer 12 and the input end of the speed reducer 12 are disconnected from the synchronous rotation connection. It is more convenient to mount the rotary force transmitter 2, the pull rod 42 and the machine tool spindle 41 and ensure that the centers of the three are coaxial, and the assembly precision of the three is improved.

[0088] In the preferred embodiment, the rotary force transmitter 2 is further provided with a protective shell 60, one end of the protective shell 60 is fixedly installed with a shell flange 52 close to the output end of the lead screw 21, and the protective shell 60 is sleeved outside the transition disc 50. Further, the shell flange 52 and the protective shell can be designed as one whole, and the protective shell can be sleeved outside the transition disc 50 at the tail end of the machine tool spindle 41 through bolt connection, facilitating the installation of the rotary force transmitter 2.

[0089] In the preferred embodiment, the shell mounting disc and the spindle housing 43 are fixedly connected, the shell mounting disc is fixedly connected with the shell flange 52, the machine tool spindle 41 is installed in the spindle housing 43, and the spindle housing 43 is used to install the machine tool spindle 41 on the machine tool body 4. The spindle housing 43, the shell mounting disc and the protective shell are fixed relative to the machine tool, and the three do not rotate with the machine tool spindle 41. The shell flange 52 and the shell mounting disc are provided to improve the installation efficiency; cooperating with the positioning mechanism 61 can coaxially install the lead screw 21 and the pull rod 42, and coaxially install the machine tool spindle 41 and the protective shell.

[0090] The application also provides an electric clamping system, which comprises the rotary force transmitter 2, the rotary force transmitter 2 comprises a power connection part, a lead screw 21, a lead screw nut 30 matched with the lead screw 21, and a transition disc 50, the lead screw nut 30 can move forward and backward when the lead screw 21 rotates, a driving connection part is located at the input end of the lead screw 21, and the driving connection part is used to be connected with a motor 11; the rotary force transmitter 2 is further provided with a protective shell, the lead screw 21 and the lead screw nut 30 are arranged outside the cavity of the protective shell, and the protective shell protects the lead screw 21 and the lead screw nut 30.

[0091] The electric clamping system further comprises the rotary force transmitter 2, the driving motor 11 assembly 1 and a chuck, and the electric clamping system and the machine tool body 4 cooperate to form the following machine tool for machining workpieces.

[0092] Another aspect of the present application provides a machine tool, which comprises a driving motor 11 assembly 1, a machine tool body 4, a chuck and the above-mentioned rotary force transmitter 2, the machine tool body 4 comprises a pull rod 42 and a main shaft, the rotary force transmitter 2 is connected with the pull rod 42 of the machine tool body 4, the pull rod 42 is used to drive the opening and closing of the clamping jaw of the chuck, the driving motor 11 assembly 1 and the rotary force transmitter 2 can be in driving connection or disconnection, and the rotary force transmitter 2 and the main shaft of the machine tool body 4 can be in driving connection or disconnection. When it is needed to clamp or loosen the workpiece, the driving motor 11 assembly 1 and the rotary force transmitter 2 are in driving connection, and the rotary force transmitter 2 and the main shaft of the machine tool body 4 are in disconnection, at this time, the driving motor 11 assembly 1 can drive the pull rod 42 to move forward and backward along the axial direction through the rotary force transmitter 2, so that the clamping jaw of the chuck is opened and closed. When it is needed to process the workpiece, the driving motor 11 assembly 1 and the rotary force transmitter 2 are in disconnection, and the rotary force transmitter 2 and the main shaft of the machine tool body 4 are in driving connection, when the main shaft of the machine tool body 4 rotates, the clamping jaw of the chuck is driven to rotate. The example of the machine tool of the present application can refer to Chinese patent document CN117620240A.

[0093] The present application has the following advantages:

[0094] 1. The servo motor provides the required small torque, energy saving and environmental protection. The motor only works in positive rotation clamping (within 1 second) and reverse rotation loosening (within 1 second). The motor works for 2 seconds in one processing cycle, which is about 3.3% of the working operation time (for example, 60 seconds) of the traditional motor. The motor power is 200 watts, which is about 26% to 13% of the traditional 750w / 1500w. The energy saving is 75% to 85%. Total energy saving: 100%-3.3%*20%=99.34%. Almost no electricity is needed; no hydraulic oil is needed, and it is directly driven by electricity.

[0095] 2. Motor size comparison: traditional 1.5KW motor, traditional 0.75KW motor, new structure 200W servo motor.

[0096] Speed: 200W servo motor, 6000RPM, reducer speed ratio 30, screw lead 5mm, clamping jaw stroke 10mm.

[0097] 3. Clamping time T: 10 / (6000 / 30 / 60*5)=0.597 seconds, + clamping system delay 0.4 seconds, total <1.0 seconds. Loosening time t is the same as clamping time.

[0098] 4. Tension (thrust) adjustment method: set the clamping time, select the appropriate clamping motor speed, such as 200W HuiChuan servo motor, 6000RPM. Adjust the motor torque output%, the following is the measured data: clamping force stepless adjustment (programmed), wide adjustment range, covering film chuck to 4 tons of tension force working condition.

[0099] 5. Lightweight: Achieves stepless adjustment of radial clamping force from 0.1N to 8000N (for clamping an egg: the eggshell can withstand 3.4kgf).

[0100] 6. Based on the measured data: the minimum tensile force is 0.42KN (42.8kgf) and the maximum tensile force is 42.18KN (4.3 tons). Converted to the radial clamping force of the chuck jaws (the angle between the chuck slider and the horizontal is 12°), the values ​​are 73.69N to 7400N, which translates to 7.5 to 754.3kgf. The minimum radial clamping force can completely replace the membrane chuck.

[0101] The overall performance advantages of this invention are:

[0102] 1. High-speed performance: There are no components that limit the speed of the machine tool, unlike rotary cylinders (pneumatic cylinders) which have a maximum speed limit of only 4500 RPM, restricting the machining spindle (the traditional spindle) to a speed of less than 5000 RPM. This system can achieve higher spindle speeds, such as 8000 to 9000 RPM (using collets, CBN, and PCD tools), which makes a significant contribution to improving machine tool efficiency.

[0103] 2. Ultra-high energy efficiency: Saves over 99% of electrical energy, eliminating the need for compressed gas or hydraulic oil.

[0104] 3. Infinitely adjustable tension force: Adopting dual-mode servo control, the clamping force can be programmed and adjusted in the machine tool program. The tension force of a set of devices is infinitely adjustable from 3 kg to 5 tons.

[0105] 4. Environmental friendliness: Since no hydraulic oil is needed, the problem of hydraulic oil leakage into the natural environment is avoided.

[0106] 5. High adaptability: No longer needs to be considered due to climate change requiring repeated replacement of hydraulic oil with different viscosities (winter, summer).

[0107] 6. Low maintenance rate: Currently, over 30% of equipment maintenance involves the hydraulic station and rotary cylinder, such as water ingress into the hydraulic station, motor repair (because it needs to run continuously), solenoid valve malfunction, high-pressure pipe damage, and short lifespan of the rotary cylinder, etc. This device eliminates the need for these functional components, has a large design margin, and achieves minimal or no maintenance.

[0108] 7. Low operating cost: Compared with a hydraulic station + rotary cylinder system equipped with a 0.75KW motor, it can save nearly 6,000 kWh of electricity per year (24H*330D), equivalent to 4,800 yuan in electricity costs and 1,000 yuan in hydraulic oil costs, for a total saving of 5,500 yuan; compared with a hydraulic station + rotary cylinder system equipped with a 1.5KW motor, it saves nearly 1,000 yuan per year.

[0109] 8. Environmental: The saved electric energy is to avoid the ambient temperature rise caused by the traditional hydraulic oil heating, noise. Improve the comfort of the working environment of workers.

[0110] 9. Low carbon: saving electricity and hydraulic oil, maintenance, etc. Carbon emissions, green mechanical and electrical products

[0111] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be the first and second features directly contact, or the first and second features indirectly contact through intermediate media. Moreover, the first feature "above", "above" and "on" the second feature can be the first feature directly above or obliquely above the second feature, or just means that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "under" the second feature can be the first feature directly below or obliquely below the second feature, or just means that the first feature is lower than the second feature in horizontal height.

[0112] In the description of the present application, the description of the terms "preferred embodiment", "further embodiment", "other embodiment" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0113] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A rotary force transmitter, characterized in that, It includes a power connection part, a machine tool spindle fixing part, a first clutch mechanism, a lead screw and a lead screw nut. The lead screw nut is matched with the lead screw. When the lead screw rotates, the lead screw nut can move back and forth. The power connection part is located at the input end of the lead screw. The machine tool spindle fixing part is close to the output end of the lead screw. The first clutch mechanism enables the power connection part to be connected to or disconnected from the lead screw transmission connection. The rotary power transmitter also includes a second clutch mechanism, a part of which is connected to the machine tool spindle fixing part and a part of which is connected to the lead screw, so that when the machine tool spindle fixing part rotates, it drives the lead screw to rotate; Both the first clutch mechanism and the second clutch mechanism include a magnetic base and a clutch component that can be connected or separated from each other. The magnetic base contains an electromagnetic coil that can be energized. The clutch component is connected or separated by energizing or de-energizing the magnetic base. The rotary power transmitter also includes a second mounting plate. The magnetic seats of the first clutch mechanism and the second clutch mechanism are respectively fixed on both sides of the second mounting plate and do not move with the lead screw of the rotary power transmitter. The rotary power transmitter also includes a main housing, one end of which is used to fix and install the machine tool spindle, and the main housing can rotate synchronously with the machine tool spindle; The second mounting plate is fixedly connected to the machine tool spindle mounting base.

2. The rotary force transmitter as described in claim 1, characterized in that, It also includes a pull rod connecting shaft, one end of which is installed with the pull rod connecting shaft. The first clutch mechanism is partially connected to the power connection part and partially connected to the lead screw.

3. The rotary force transmitter as described in claim 1, characterized in that, It also includes a speed reducer, with the main housing fitted over the lead screw nut; The other end of the main housing is fixed to the housing of the reducer; a part of the second clutch mechanism is fixed to the housing of the reducer, and the other part of the second clutch mechanism is fixed to the input end of the reducer; the second clutch mechanism has an engaged state or an unengaged state. When engaged, the machine tool spindle rotates synchronously with the main housing, the housing of the reducer, and the input end of the reducer in sequence; when unengaged, the housing of the reducer and the input end of the reducer are disengaged from synchronous rotation.

4. The rotary force transmitter as described in claim 1, characterized in that, It also includes a speed reducer, which is disposed between the first clutch mechanism and the lead screw. The input end of the speed reducer and the power connection part are connected or disconnected through the first clutch mechanism, and the output end of the speed reducer is connected to the lead screw.

5. The rotary force transmitter as described in claim 4, characterized in that, The second clutch mechanism is disposed between the input end of the reducer and the power connection part. The input end of the reducer is connected to or disconnected from the machine tool spindle fixing part through the second clutch mechanism. The rotary power transmitter is also provided with a protective shell, and the lead screw, lead screw nut, reducer, first clutch mechanism and second clutch mechanism are arranged inside the protective shell.

6. The rotary force transmitter as described in claim 5, characterized in that, The protective housing is also provided with a positioning mechanism. The lead screw, reducer, first clutch mechanism and second clutch mechanism are coaxially arranged with the main housing. The positioning mechanism is used to adjust the position of the main housing and the protective housing and adapt their axes. The rotary force transmitter also includes a magnetic induction device. One part of the magnetic induction device is fixedly mounted on the protective housing, and the other part moves axially synchronously with the lead screw and nut. The magnetic induction device is used to limit the axial travel of the lead screw and nut. The input end of the reducer is provided with a reduction input shaft. The first clutch mechanism includes a first clutch plate, a first rotating seat, and a first magnetic seat. The second clutch mechanism includes a second clutch plate, a second rotating seat, and a second magnetic seat. The first clutch plate is fixed to the power connection part, and the second clutch plate is fixed to the housing of the reducer. The first rotating seat and the second rotating seat are fitted and fixed to the reduction input shaft. The first magnetic seat can make the first clutch plate engage or disengage with the first rotating seat. The second magnetic seat can make the second clutch plate engage or disengage with the second rotating seat.

7. A machine tool, characterized in that, The device includes a drive motor assembly, a machine tool body, a chuck, and a rotary transmission device as described in claim 1. The machine tool body includes a tie rod and a spindle. The rotary transmission device is connected to the tie rod of the machine tool body. The tie rod is used to drive the opening and closing of the chuck's jaws. The drive motor assembly and the rotary transmission device can be connected or disconnected from the transmission connection. The rotary transmission device and the spindle of the machine tool body can be connected or disconnected from the transmission connection. When it is necessary to clamp or release the workpiece, the drive motor assembly and the rotary power transmitter are connected in transmission, and the rotary power transmitter and the spindle of the machine tool body are disconnected in transmission. At this time, the drive motor assembly can drive the pull rod to move back and forth along the axis through the rotary power transmitter, so that the jaws of the chuck open and close. When a workpiece needs to be processed, the drive motor assembly and the rotary power transmitter are disengaged from the transmission connection. The rotary power transmitter is connected to the spindle of the machine tool body. When the spindle of the machine tool body rotates, it drives the jaws of the chuck to rotate.

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