Rotary force transmission device and machine tool

Abstract

The invention provides a rotary force transmission device and a machine tool, the rotary force transmission device comprises a power connecting 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 translate front and back when the screw rod rotates, and the pull rod connecting shaft is mounted at one end of the screw rod nut; the driving connecting 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, part of the first clutch mechanism is connected with the power connecting part, and part of the first clutch mechanism is connected with the lead screw, so that the power connecting part is in transmission connection with the lead screw or is separated from the transmission connection with the lead screw. The rotary force transmission device provided by the invention can be directly sleeved in the machine tool main shaft as a related part, and the structure has better reliability.

Description

Technical Field

[0001] The invention relates to the technical field of chuck driving, and in particular to a rotary force transmitter and a machine tool. Background Art

[0002] A chuck is a mechanical device used to clamp workpieces on machine tools. It is a machine tool accessory that uses the radial movement of the movable jaws evenly distributed on the chuck body to clamp and position the workpiece. A chuck generally consists of three parts: a chuck body, movable jaws, and a jaw drive motor assembly. The chuck body has a minimum diameter of 65 mm and a maximum of 1500 mm. There is a through hole in the center to allow the workpiece or bar to pass through; the back has a cylindrical or short conical structure, which is connected to the end of the machine tool spindle directly or through a flange. Chucks are usually installed on lathes, external cylindrical grinders, and internal cylindrical grinders. They can also be used in conjunction with various indexing devices for 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 drive chuck opening and closing mechanism has a structure that uses a hydraulic station and a high-pressure oil cylinder. Although it has been used for a long time and the technology is relatively mature, during production and use, the motor needs to compress the hydraulic oil to form high pressure and then push the chuck to clamp the workpiece. In this energy conversion process, the energy consumption is large, the cost is high, and if the hydraulic oil leaks, the impact on the environment is also large. Summary of the invention

[0004] Based on this, it is necessary to provide a green, environmentally friendly and more stable rotary force transmitter.

[0005] The present invention provides a rotary force transmitter, comprising a power connection part, a machine tool spindle fixing part, a first clutch mechanism, a screw and a screw nut, wherein the screw nut is matched with the screw, and the screw nut can translate forward and backward when the screw rotates, the drive connection part is located at the input end of the screw, the machine tool spindle fixing part is close to the output end of the screw, and the first clutch mechanism enables the power connection part to be transmission-connected or disengaged from the screw.

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

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

[0008] The rotary force transmitter comprises a self-locking connector, through which the machine tool spindle fixing part and the screw rod are transmission-connected or disengaged.

[0009] Preferably, the rotary force transmitter also includes a reducer, which is arranged between the first clutch mechanism and the screw rod, the input end of the reducer and the power connection part are transmission-connected or transmission-disconnected through the first clutch mechanism, and the output end of the reducer is connected to the screw rod.

[0010] Preferably, the rotary force transmitter also includes a second clutch mechanism, which is arranged between the input end of the reducer and the power connection part, and the input end of the reducer is transmission-connected or transmission-disconnected with the machine tool spindle fixing part through the second clutch mechanism.

[0011] Preferably, the rotary force transmitter also includes a main housing, one end of the main housing is used to fix the machine tool spindle, and the other end 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 a disengaged state, and when in the engaged state, 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 in the disengaged state, the housing of the reducer and the input end of the reducer are disconnected from the synchronous rotation connection.

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

[0013] Preferably, a positioning mechanism is also provided on the protective shell, and the screw rod, the reducer, the first clutch mechanism and the second clutch mechanism are arranged coaxially with the main shell, and the positioning mechanism is used to adjust the position of the main shell and the protective shell and make the axes of the two fit together;

[0014] The rotary force transmitter also includes a magnetic induction device, a part of which is fixedly arranged on the protective shell, and the other part moves axially synchronously with the lead screw nut, and the magnetic induction device is used to limit the axial stroke of the lead screw nut.

[0015] Preferably, a reduction input shaft is provided at the input end of the reducer, the first clutch mechanism includes a first clutch plate, a first rotating seat and a first magnetic seat, and the second clutch mechanism includes a second clutch plate, a second rotating seat and a second magnetic seat; the first clutch plate is fixed on the power connection part, the second clutch plate is fixed on the housing of the reducer, the first rotating seat and the second rotating seat are mounted on and fixed on the reduction input shaft, and the first magnetic seat can make the first clutch plate and the first rotating seat engaged or disconnected; the second magnetic seat can make the second clutch plate and the second rotating seat engaged or disconnected.

[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 above-mentioned rotary force transmitter, wherein the machine tool body includes a pull rod and a spindle, the rotary force transmitter is connected to the pull rod of the machine tool body, the pull rod is used to drive the opening and closing of the clamping jaws of the chuck, the drive motor assembly and the rotary force transmitter can be transmission-connected or disengaged, and the rotary force transmitter and the spindle of the machine tool body can be transmission-connected or disengaged;

[0017] When it is necessary to clamp or loosen the workpiece, the drive motor assembly is connected to the rotary force transmitter, and the rotary force transmitter is disconnected from the main shaft of the machine tool body. At this time, the drive motor assembly can drive the pull rod to move forward and backward along the axial direction through the rotary force transmitter, so that the clamping jaws of the chuck open and close;

[0018] When it is necessary to process the workpiece, the driving motor assembly and the rotary force transmitter are disconnected from the transmission connection, and the rotary force transmitter is connected to the main shaft of the machine tool body. When the main shaft of the machine tool body rotates, the clamping jaws of the chuck are driven to rotate.

[0019] The rotary force transmitter provided by the present invention can be directly installed inside the main shaft of a machine tool as a related component, and the structure has better reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other purposes, features and advantages of the present invention will become more clear by more specific description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts in all the accompanying drawings, and the accompanying drawings are not deliberately scaled to the actual size, and the focus is on illustrating the main purpose of the present invention.

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

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

[0023] Figure 3 It is a schematic diagram of the enlarged structure of part A in 2;

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

[0025] Figure 5 for Figure 4 A schematic diagram of the structure of part B in the middle is enlarged;

[0026] Figure 6 for Figure 4 The enlarged schematic diagram of the structure of part C in the middle;

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

[0028] Figure 8 for Figure 7 The middle part of the structure is enlarged schematic diagram;

[0029] Fig. 9 for Figure 7 The middle part of the structure is enlarged schematic diagram;

[0030] Fig.10 This is a schematic diagram of the transition plate structure provided by the present invention.

[0031] Fig.11 Output torque and tension diagram.

[0032] Driving motor assembly 1, rotary force transmitter 2, machine tool body 4, motor 11, reducer 12, screw 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, limit block 222, bearing 311, first magnetic seat 341, second magnetic seat 342, first clutch plate 351, second clutch plate 352, first rotating seat 361, second rotating seat 362;

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

[0034] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given 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 may be directly connected to another element and integrated therewith, or there may be an intermediate element at the same time. The terms "installed", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art. The terms used in the specification herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] refer to Figure 1-6 The present invention provides a rotary force transmitter, which includes a first clutch mechanism, a second clutch mechanism, a screw 21, a screw nut 22, a pull rod connecting shaft 23, a power connecting part, and a machine tool spindle fixing part. The power connecting part is used to install the driving mechanism, the pull rod connecting shaft 23 is used to connect the pull rod 42, and the machine tool spindle fixing part is used to connect the machine tool spindle 41.

[0038] The screw rod 21 is installed at the center of the rotary force transmitter 2 through the bearing 311, and as the power input shaft, it can rotate synchronously with the reducer to provide push / pull force.

[0039] The screw nut 22 is matched with the screw 21. When the screw 21 rotates, the screw nut 22 can translate forward and backward. The two cooperate to convert the rotation into linear motion. One end of the screw nut 22 is provided with an external thread for installing the pull rod connecting shaft 23. The screw nut mounting sleeve 221 is fixedly mounted on the bearing mounting seat 31, which is used to radially position the screw nut to prevent the screw nut from rotating with the screw, but can slide axially. The end face of the screw is installed with a limit block 222, which is used to limit the screw nut and prevent it from sliding out due to over-travel.

[0040] The pull rod connecting shaft 23 is connected to the lead screw nut at one end and the pull rod 42 in the machine tool spindle 41 at the other end by means of a thread, so as to transmit the push / pull force.

[0041] The power connection part includes a first mounting plate 24, and the first mounting plate 24 is used to mount the reducer of the driving mechanism.

[0042] The fixed part of the machine tool spindle includes a bearing mounting seat 31, a bearing 311, and a bearing surface flange 32. The bearing mounting seat 31 is sleeved on the side of the screw input end and fixed to the pulley flange by bolts, and the interior thereof is used to install the positioning bearing 311. The bearing 311 is installed in the bearing mounting seat 31 and sleeved on the screw input end to ensure smooth rotation of the screw and to withstand the axial tension when the tooling is clamped or loosened. The end face thrust ball bearing 311 used in this embodiment can also be used with other bearings 311 such as spherical roller bearings 311. The bearing surface flange 32 is fixed to the bearing mounting seat 31 by bolts, and can press and position the bearing 311.

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

[0044] The second mounting plate 25 is fixedly connected to the mounting seat of the machine tool spindle 41 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 set to multiple or single. The first flange 28 is fixed to the output shaft of the reducer and can rotate with the reducer. The mounting rod and the nut fix the second mounting plate 25 to 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 a preferred embodiment, the first clutch mechanism and the second clutch mechanism may adopt electromagnetic clutch or mechanical clutch.

[0046] In a further preferred embodiment, the first clutch mechanism and the second clutch mechanism both include a magnetic seat and a clutch member that can be connected or separated from each other. The magnetic seat of the first clutch mechanism is called a first magnetic seat 341, and the magnetic seat of the second clutch mechanism is called a second magnetic seat 342. The connection or separation of the clutch member is controlled by energizing or de-energizing the magnetic seat. There is an energized electromagnetic coil in the magnetic seat, which can control whether there is magnetic attraction when it is energized or not.

[0047] In a preferred embodiment, the first clutch mechanism and the second clutch mechanism may adopt a normally open structure or a normally closed structure. In the normally open structure, the magnetic base is energized to connect the clutch components, and the clutch components are separated when the power is not supplied; in the normally closed structure, the magnetic base is energized to separate the clutch components, and the clutch components are connected when the power is not supplied.

[0048] If a normally closed structure is used, the consumption of electric energy can be reduced, the stability of clamping during processing can be improved, and it can ensure that the workpiece is still effectively clamped and does not loosen or fall off in the event of a sudden power outage during the workpiece clamping and rotation process.

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

[0050] refer to Figure 4-5In a preferred embodiment, the clutch member of the first clutch mechanism specifically includes a first clutch plate 351 and a first rotating seat 361. The first clutch plate 351 is fixed on the drive motor assembly 1. The first rotating seat 361 is mounted on the screw 21 of the rotary force transmitter 2 and can rotate with the screw 21. The first magnetic seat 341 can control the first clutch plate 351 to engage with the first rotating seat 361, so that the drive motor assembly 1 and the screw 21 are connected in transmission. Specifically, the first clutch plate 351 is fixedly mounted on the first flange 28 and is made of a material with good magnetic conductivity. After the first clutch plate 351 is disconnected from the first rotating seat 361, there is a spacing of 0.1-1mm between the first clutch plate 351 and the first rotating seat 361, further a spacing of 0.2-0.4mm, and further a spacing of 0.3mm, and they are not connected to each other.

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

[0052] The specific working principle of the first clutch mechanism (taking the normally open structure as an example) is as follows:

[0053] refer to Figure 4-6 , the first clutch mechanism is installed at the power (torque) input end of the rotary force transmitter 2, and the first flange 28 is fixedly connected to the first clutch plate 351 as a whole and fixedly installed on the output shaft of the reducer. The first rotating seat 361 is fixedly mounted on the input end of the screw to ensure that the two can rotate synchronously, and a 0.3mm gap is set between the end face of the first rotating seat 361 and the end face of the first clutch plate 351. The first electromagnetic magnetic seat is fixedly mounted on the second mounting plate 25 and cannot rotate, so it will not rotate with the screw of the rotary force transmitter 2. When the first electromagnetic magnetic seat is energized to generate 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 gap is 0 at this time) as an integral part. At this time, the power (torque) transmitted by the deceleration can directly act on the screw, drive the screw to rotate, and further drive the screw nut to slide back and forth. When the first electromagnetic magnetic seat is powered off, the magnetic force disappears and the end surface of the first rotating seat 361 and the end surface of the first clutch plate 351 are restored to a distance of 0.3 mm. At this time, the two are independent of each other and their actions do not affect each other.

[0054] In reference Figure 4-6In a preferred embodiment, the rotary force transmitter 2 and the main shaft 41 of the machine tool body 4 are connected or disconnected through a second clutch mechanism. The second clutch mechanism includes a second clutch plate, a second rotating seat 362 and a second magnetic seat 342. The second clutch plate 352 is connected to the main shaft 41 of the machine tool body 4. The second rotating seat 362 is mounted on the screw 21 of the rotary force transmitter 2 and can rotate with the screw 21. When the second magnetic seat 342 is powered on or off, the second clutch plate and the second rotating seat 362 are attracted to make the rotary force transmitter 2 and the main shaft 41 of the machine tool body 4 connected. After the second clutch plate is disconnected from the second rotating seat 362, there is a spacing of 0.1-1mm between the second clutch plate and the second rotating seat 362, and further a spacing of 0.2-0.4mm.

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

[0056] The second clutch piece 352 is fixedly mounted 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, it maintains a distance of 0.3mm from the second rotating seat and is not connected to each other. When the second magnetic seat 342 is energized to generate magnetic attraction, the second clutch piece 352 can be slightly deformed and fit with the end face of the second rotating seat 362. Through the combined action of magnetic attraction and friction, the screw rod and the rotary actuator are relatively fixed to the machine tool spindle 41 and temporarily combined into a whole. When the screw rod provides and transmits pulling force to the pull rod 42 to clamp the workpiece and process it, the rotary actuator can rotate together with the machine tool spindle 41 until the processing is completed. When the processing is completed, the second rotating seat and the second clutch piece 352, at this time, the rotary actuator and the machine tool spindle 41 become two relatively movable individuals.

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

[0058] 1. Normally open structure

[0059] The bearing end face flange 32 installed at the middle part of the power (torque) input end of the rotary force transmitter is fixedly connected to the second clutch plate 352 as a whole and fixed on the bearing mounting seat 31. The second rotating seat 362 is fixed to the middle part of the screw input end to ensure that the two can rotate synchronously, and a 0.3mm gap is also set between the end face of the second rotating seat 362 and the end face of the second clutch plate 352. The second magnetic seat 342 is fixedly installed on the second mounting plate 25 and cannot rotate, so it will not rotate with the screw of the rotary force transmitter 2. When the second magnetic seat 342 is energized to generate electromagnetic attraction, the end face of the second rotating seat 362 and the end face of the second clutch plate 352 are attracted to each other (the gap is 0 at this time) to form an integral part. At this time, the rotary transmitter and the machine tool spindle 41 are temporarily connected as a whole, and can rotate synchronously with the rotation of the machine tool spindle 41. When the second magnetic seat 342 is powered off, the magnetic force disappears, and the end face of the second rotating seat 362 and the end face of the second clutch plate 352 return to a spacing of 0.3 mm. At this time, the two are independent of each other and their actions do not affect each other, and the independent operation of the screw rod in the rotating force transmission part can be achieved when the machine tool spindle 41 is stationary.

[0060] 2. Normally closed structure

[0061] When the workpiece is being processed, the first rotating seat 361 and the first clutch plate 351 in the first clutch mechanism are powered off and separated, and the second rotating seat 362 and the second clutch plate 352 in the second clutch mechanism are powered off and attracted to ensure that the rotating force transmission part and the machine tool spindle 41 are connected as a whole. When the workpiece processing is completed, the first rotating seat 361 and the first clutch plate 351 in the first clutch mechanism are powered on and attracted to, and the second rotating seat 362 and the second clutch plate 352 in the second clutch mechanism are powered on and separated by a distance of 0.3 mm to ensure that the rotating force transmitter 2 and the machine tool spindle 41 are temporarily disconnected and can operate independently.

[0062] The present invention designs the rotary force transmission part to be an associated rotary force transmission device which is mounted inside the machine tool spindle. The main parts can rotate with the spindle. The axial force generated when the push / pull action occurs will act directly on the machine tool spindle instead of being carried by the bearing. Therefore, the structure has higher reliability.

[0063] refer to Figure 1-3This embodiment also provides a machine tool, including the rotary force transmitter, drive mechanism and machine tool body mentioned in the above embodiment, the drive mechanism includes a motor 11 and a reducer 12. The machine tool body includes a pull rod 42 and a spindle 41. When it is necessary to clamp or loosen the workpiece, the first clutch mechanism causes the drive motor assembly 1 and the rotary force transmitter 2 to be transmission-connected, and the rotary force transmitter 2 and the spindle 41 of the machine tool body 4 are disengaged from the transmission connection. At this time, the drive motor assembly 1 can drive the pull rod 42 to move axially forward and backward through the rotary force transmitter 2, so that the clamping claws of the chuck open and close; at this time, the rotation of the machine tool spindle 41 will not affect the rotary force transmitter 2, thereby avoiding the problem of cable winding when the machine tool spindle 41 rotates at high speed.

[0064] When the workpiece is clamped and needs to be processed in the next step, the driving motor assembly 1 and the rotary force transmitter 2 are disconnected from the transmission connection, and the driving force of the driving motor assembly 1 will not be transmitted to the rotary force transmitter 2, so as to avoid the pull rod 42 being pulled to cause the jaws to open. At this time, the rotary force transmitter 2 and the main shaft 41 of the machine tool body 4 are connected in transmission, so that the rotary force transmitter 2 and the machine tool body 4 are combined into one, and the rotary force transmitter 2 rotates at a high speed closely with the main shaft 41 of the machine tool to ensure that the rotary force transmitter 2 will not loosen, so as to avoid the rotary force transmitter 2 loosening to cause the pull rod 42 to pull and cause the jaws to open.

[0065] Please refer to Figure 7-Figure 11 On the other hand, the present invention provides a rotational force transmitter of another embodiment.

[0066] The rotary force transmitter 2 includes a power connection part, a fixed part of the machine tool spindle 41, a first clutch mechanism 350, a screw 21 and a screw nut 30. The screw nut 30 is matched with the screw 21. When the screw 21 rotates, the screw nut 30 can translate forward and backward. The drive connection part is located at the input end of the screw 21, and the fixed part of the machine tool spindle 41 is close to the output end of the screw 21. The first clutch mechanism 350 makes the power connection part and the screw 21 transmission connection or disengagement connection; it also includes a reducer 12, which is arranged between the first clutch mechanism 350 and the screw 21. The input end of the reducer 12 and the power connection part are transmission connected or disengaged through the first clutch mechanism 350, and the output end of the reducer 12 is connected to the screw 21. The above arrangement increases the service life of the first clutch and avoids the first clutch mechanism 350 being arranged at the output end of the reducer 12 and being subjected to a higher torque. For example, if the reduction ratio of the reducer 12 is 50:1, the torque is amplified by about 50 times. If the first clutch mechanism 350 is disposed at the output end of the reducer 12, the torque it bears is amplified by about 50 times.

[0067] In a preferred embodiment, the rotary force transmitter 2 further includes a second clutch mechanism 360, which is disposed between the input end of the reducer 12 and the power connection portion, and the input end of the reducer 12 is transmission-connected or disengaged from the fixed portion of the machine tool spindle 41 through the second clutch mechanism 360. The first clutch mechanism 350 and the second clutch mechanism 360 ensure that the clamping process and the rotation process of the machine tool spindle 41 can be separated, and the axial force generated when the push / pull action occurs will directly act on the machine tool spindle 41, rather than being carried by the bearing 311, so that the structure of this embodiment has higher reliability. At the same time, the second clutch mechanism 360 also has a higher service life.

[0068] Of course, in order to achieve transmission connection or disengagement between the machine tool spindle 41 and the screw 21, a self-locking connector may be used in other embodiments. For example, the rotary force transmitter 2 includes a self-locking connector, and the fixed portion of the machine tool spindle 41 and the screw 21 are transmission connected or disengaged through the self-locking connector. The self-locking connector may be a self-locking structural member in the reducer 12, or the self-locking connector may be a self-locking screw assembly (which includes a screw nut 30 and a screw 21 assembly, and includes a self-locking connector). The self-locking reducer 12 and the self-locking screw assembly are prior art and are not further limited here.

[0069] In a preferred embodiment, the rotary force transmitter 2 also includes a main housing 36, one end of the main housing 36 is used to fix the machine tool spindle 41, and the other end is fixed to the housing of the 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 processing; a part of the second clutch mechanism 360 is fixed to the housing of the reducer 12, and the other part of the second clutch mechanism 360 is fixed to the input end of the reducer 12, and the input end of the reducer 12 is the reduction input shaft 121; the second clutch mechanism 360 has an engaged state or a disengaged state. When in the engaged state, the machine tool spindle 41 rotates synchronously with the main housing 36, the housing of the reducer 12 and the input end of the reducer 12 (i.e., the reduction input shaft 121) in sequence. When in the disconnected state, the housing of the reducer 12 and the input end of the reducer 12 are disconnected from the synchronous rotation connection, that is, the reduction input shaft 121 and the housing of the reducer 12, the main housing 36 and the machine tool spindle 41 are disconnected from the transmission connection, thereby ensuring that the screw rod 21 is disconnected from the transmission connection with the above three. At this time, if the first clutch mechanism 350 is attracted, the motor 11 and the reduction input shaft 121 are connected to each other through the first clutch mechanism 350, and the forward and reverse rotation of the motor 11 can realize the clamping and release of the chuck.

[0070] In a preferred embodiment, a protective shell 60 is further provided outside the rotary force transmitter, and the screw 21, the screw nut 30, the reducer 12, the first clutch mechanism 350 and the second clutch mechanism 360 are arranged in the protective shell 60. Protection refers to preventing dust, dust, water mist and other debris from entering to protect the components in the rotary force transmitter. The provision of the protective shell 60 prevents dust from entering the screw 21, the screw nut 30, the reducer 12, the first clutch mechanism 350 and the second clutch mechanism 360. The protective shell 60 increases the service life of these components and makes the rotary force transmitter 2 suitable for mining or other dusty scenes. Furthermore, the protective shell 60 does not rotate relative to the machine tool, nor does it rotate with the machine tool spindle 41, and is used to connect and install the positioning motor 11 and install the non-rotating first magnetic seat 341 and second magnetic seat 342 in the fixed electromagnetic clutch.

[0071] In a preferred embodiment, a positioning mechanism 61 is further provided on the protective housing 60, and the screw 21, the reducer 12, the first clutch mechanism 350 and the second clutch mechanism 360 are all arranged coaxially with the main housing 36, and the positioning mechanism is used to adjust the coaxiality of the axis of the above four and the axis of the protective housing 60. The positioning mechanism 61 is used to adjust the position of the main housing 36 and the protective housing 60 and make the axes of the two fit together, generally making the axes of the two be in a straight line.

[0072] The positioning mechanism 61 includes a positioning bolt and a positioning threaded hole. The positioning bolt and the positioning threaded hole cooperate with each other. The positioning threaded hole passes through the protective shell 60. The positioning threaded hole is arranged circumferentially along the protective shell 60. The positioning bolt passes through the positioning threaded hole and extends into the protective shell. The positioning bolt supports the rotary force transmitter.

[0073] The positioning threaded holes are evenly distributed on the circumference of the protective shell 60, and can be divided into 3 or 4 groups (circles). 1 to 3 groups can be configured axially to ensure that the center of the pull rod 42, the rotating part of the rotary force transmitter and the protective shell 60 can rotate along the same axis during the assembly process. 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 toward the protective shell 60 and fixed in position to ensure that the pull rod 42 rotates normally.

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

[0075] The magnetic induction device 37 includes an induction magnetic ring 371 and a magnetic sensor 372. The induction magnetic ring 371 is fixed on the lead screw nut 30 that only moves forward and backward axially. The magnetic sensor 372 is installed on the protective shell 60. The induction magnetic ring 371 and the magnetic sensor 372 are used to limit the axial travel of the electric pull rod 42. Further, the main housing 36 is sleeved outside the lead screw nut 30. The main housing 36 is provided with an avoidance hole (not shown in the figure). The induction magnetic ring 371 is connected to the lead screw nut 30 through a connecting rod (not shown in the figure), and the connecting rod can move in the avoidance hole.

[0076] In a preferred embodiment, the input end of the reducer 12 is provided with a reduction input shaft 121, the first clutch mechanism 350 includes a first clutch plate 351, a first rotating seat 361 and a first magnetic seat 341, and the second clutch mechanism 360 includes a second clutch plate 352, a second rotating seat 362 and a second magnetic seat 342; the first clutch plate 351 is fixed on the power connection part, the second clutch plate 352 is fixed on the housing of the reducer 12, the first rotating seat 361 and the second rotating seat 362 are sleeved and fixed on the reduction input shaft 121, and the first magnetic seat 341 can make the first clutch plate 351 and the first rotating seat 361 engaged or disconnected; the second magnetic seat 342 can make the second clutch plate 352 and the second rotating seat 362 engaged or disconnected. Further, the first magnetic seat 341 and the second magnetic seat 342 are fixed on the protective housing 60. The reduction input shaft 121 is installed in the two electromagnetic clutches and the reducer 12 for transmitting torque. The first electromagnetic clutch preferably adopts a normally open structure. The first electromagnetic clutch controls the torque input of the motor 11. When the workpiece needs to be clamped, it is powered on to attract and transmit the output torque of the motor 11. After the workpiece is clamped and during the processing, it is powered off and separated to ensure that the main part of the electric pull rod 42 can rotate at high speed with the electric 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 materials with high friction, and the first magnetic seat 341 is an electromagnet.

[0077] The preferred structure of the second electromagnetic clutch (brake) is a normally closed structure, which acts as a brake during the machining process to keep the clamping force of the pull rod 42 from decreasing. During the clamping process of the workpiece, the power is turned on to separate the magnets to ensure that the pull rod 42 and the machine tool spindle 41 can rotate relatively independently to clamp the workpiece. After the workpiece is clamped, the power is turned off to demagnetize and the friction plate is reset and attracted under the action of the spring so that the electric pull rod 42 and the machine tool spindle are reconnected to form a synchronously rotating integrated structure. The second electromagnetic clutch preferably uses a normally closed structure to form parts, and the second magnetic seat 342 is an electromagnet.

[0078] The second clutch plate 352 is an electromagnetic suction plate, the second rotating seat 362, and the second magnetic seat 342 are generally electromagnets. The second electromagnetic clutch also includes an elastic mechanism 363, a friction plate A364, and a friction plate B365. The elastic 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 includes a clutch plate A and a clutch plate B. Figure 8 The two arrows of the second clutch plate 352 point to the clutch plate A and the clutch plate B respectively, and the clutch plate A is located on the left side of the clutch plate B. The components of the second electromagnetic clutch also have the following structures and effects:

[0079] The electromagnetic attraction plate (second rotating seat 362) is installed on the reduction input shaft 121 through a key connection and can rotate with it; a friction position is set on the end face of the electromagnetic attraction plate close to the clutch plate A. When the electromagnetic attraction plate and the clutch plate A are attracted, the friction force with the clutch plate A is increased through the friction position. When the power is cut off and separated, it interacts with the friction plate A364 to bear the torque of the reduction input shaft 121.

[0080] Clutch plate A: It is connected to the friction plate A364 as a whole through bolts, guide pillars and elastic mechanism 363, and can be axially slidably mounted on the clutch plate B.

[0081] Clutch plate B: fixedly mounted on the reduction input shaft 121, used to install the clutch plate A, elastic mechanism 363 and friction plate A364, providing support for the axial movement of the clutch.

[0082] Elastic mechanism 363: It is installed in the clutch plate B. When no power is supplied, the elastic force ensures that the friction plate A364 and the friction plate B365 are in close contact with each other, and the friction force ensures that the rotary force transmitter 2 rotates synchronously with the machine tool spindle 41.

[0083] Friction plate A: connected to clutch plate A. When processing the workpiece, the electromagnet is not energized. At this time, under the action of the elastic mechanism 363, the friction plate A364 is axially pressed against the friction plate B365, and the torque of the rotation of the machine tool spindle 41 is received. When the processing is completed and the workpiece is clamped, the electromagnet is energized, and the clutch plate A slides axially toward the electromagnet side under the action of the magnetic attraction force, driving the friction plate A364 to separate from the friction plate B365, thereby separating the machine tool spindle 41 and the rotation force transmitter 2.

[0084] Friction plate B: fixedly mounted on the housing of the reducer 12, it can be set as a whole with the housing of the reducer 12, and combined with the friction plate A364 to transmit the torque of the machine tool spindle 41.

[0085] The motor mounting frame 13 is used to install the motor 11 and connect the motor 11 to the main body of the pull rod 42. The lead screw assembly is used to convert the rotational motion input by the motor 11 into axial motion. After the outer shell mounting plate 51 is fixedly installed on the non-rotating structure at the tail end of the machine tool spindle 41 by bolts, the outer shell of the electric pull rod 42 is fixedly installed on the mounting plate by bolts, so that the outer shell of the electric pull rod 42 is fixedly connected to the machine tool. The spindle housing 43 is fixed on the machine tool for installing an electric spindle or a common spindle. The output shaft key connection position 14 is used to connect to the output end of the motor 11. The shaft end nut 122 is used to be installed on the input end of the connecting shaft to assist the limiting electromagnetic clutch. In a further preferred embodiment, the pull rod connecting shaft 23: the lead screw nut 30 is connected to the pull rod 42, and this connecting sleeve can also be designed as an integral structure with the lead screw nut 30 or the pull rod 42.

[0086] The present invention also provides a transition plate 50, which is provided with two mounting end faces and a movable through hole 54 penetrating the two mounting end faces. The movable through hole 54 is used to movably penetrate the pull rod 42. The pull rod 42 can move in the axial direction by passing through the movable through hole 54. The pull rod 42 is connected to the nut 30 through the pull rod 42 connecting shaft 23 or the pull rod 42 and the nut 30 are integrally arranged. At this time, the pull rod 42 connecting shaft 23 and the nut 30 are regarded as the pull rod 42, that is, this method belongs to the protection scope of the present invention. The transition plate 50 is also provided with a mounting mechanism, and the machine tool spindle 41 and the rotary force transmitter 2 are mounted on the mounting end face of the transition plate 50 through the mounting mechanism. Because the tail mounting position structure of the machine tool spindle 41 of each manufacturer is different, this transition plate 50 is set as a non-uniform part designed on demand, and the pull rod 42 can be adaptively installed and fixed on different machine tool spindles 41, and it is ensured that the rotary force transmitter 2, the pull rod 42 and the center of the machine tool spindle 41 are coaxial.

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

[0088] In a preferred embodiment, a protective housing 60 is further provided outside the rotary force transmitter 2, and a housing flange 52 is fixedly installed at one end of the protective housing 60 near the output end of the screw 21, and the protective housing 60 is sleeved outside the transition plate 50. Further, the housing flange 52 and the protective housing can be designed as a whole, and the protective housing can be sleeved outside the transition plate 50 at the tail end of the machine tool spindle 41 by bolt connection, so as to facilitate the installation of the rotary force transmitter 2.

[0089] In a preferred embodiment, the housing mounting plate is fixedly connected to the spindle housing 43, the housing mounting plate is fixedly connected to the housing 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 housing mounting plate and the protective housing are fixed relative to the machine tool, and the three do not rotate with the machine tool spindle 41. The housing flange 52 and the housing mounting plate are set to improve the installation efficiency; the positioning mechanism 61 can be used to install the screw rod 21 and the pull rod 42 coaxially, and the machine tool spindle 41 and the protective housing are coaxially installed.

[0090] The present invention also provides an electric clamping system, which includes a rotary force transmitter 2, which includes a power connection part, a screw rod 21, a screw rod 21 nut 30 and a transition plate 50. The screw rod 21 nut 30 is matched with the screw rod 21. When the screw rod 21 rotates, the screw rod 21 nut 30 can translate back and forth. The drive connection part is located at the input end of the screw rod 21, and the drive connection part is used to connect to the motor 11; a protective shell is also provided outside the rotary force transmitter 2, and the screw rod 21 and the screw rod 21 nut 30 are arranged outside the cavity of the protective shell, and the protective shell protects the screw rod 21 and the screw rod 21 nut 30.

[0091] The electric clamping system also includes the above-mentioned rotary force transmitter 2, drive motor 11 assembly 1 and chuck. The electric clamping system and the machine tool body 4 cooperate to form the following machine tool for processing workpieces.

[0092] On the other hand, the present invention provides a machine tool, which includes a drive motor 11 component 1, a machine tool body 4, a chuck and the above-mentioned rotary force transmitter 2, the machine tool body 4 includes a pull rod 42 and a spindle, the rotary force transmitter 2 is connected to the pull rod 42 of the machine tool body 4, the pull rod 42 is used to drive the jaws of the chuck to open and close, the drive motor 11 component 1 and the rotary force transmitter 2 can be transmission-connected or disengaged, and the rotary force transmitter 2 and the spindle of the machine tool body 4 can be transmission-connected or disengaged. When it is necessary to clamp or loosen the workpiece, the drive motor 11 component 1 and the rotary force transmitter 2 are transmission-connected, and the rotary force transmitter 2 and the spindle of the machine tool body 4 are disengaged from the transmission connection. At this time, the drive motor 11 component 1 can drive the pull rod 42 to move forward and backward along the axial direction through the rotary force transmitter 2 to open and close the jaws of the chuck. When it is necessary to process the workpiece, the drive motor 11 component 1 and the rotary force transmitter 2 are disengaged from the transmission connection, and the rotary force transmitter 2 and the spindle of the machine tool body 4 are transmission-connected. When the spindle of the machine tool body 4 rotates, the jaws of the chuck are driven to rotate. An example of the machine tool of the present invention can be found in Chinese patent document CN117620240A.

[0093] The present invention has the following advantages:

[0094] 1. The servo motor provides the required small torque, which is energy-saving and environmentally friendly. The motor only works in forward rotation clamping (within 1 second) and reverse rotation loosening (within 1 second). The motor works within 2 seconds in a processing cycle, which is about 3.3% of the working time of the traditional motor (for example, 60 seconds). The motor power is 200 watts, which is about 26% to 13% of the traditional 750w / 1500w, saving 75% to 85%, and the total energy saving is: 100%-3.3%*20%=99.34%. Almost no electricity is required; no hydraulic oil is required, 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 ratio 30, screw lead 5mm, clamping stroke 10mm.

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

[0098] 4. Tension (thrust) adjustment method: Set the clamping time and select the appropriate clamping motor speed, such as 200W Inovance servo motor, 6000RPM. Adjust the motor torque output %. The following is the measured data: The clamping force is steplessly adjustable (programmable), with a wide adjustment range, covering film chucks to 4 tons of tension.

[0099] 5. Lightweight: The radial clamping force can be adjusted from 0.1N to 8000N (clamping eggs: the egg shell can withstand 3.4kgf).

[0100] 6. According to the measured data: the minimum pulling force is 0.42KN (42.8kgf), the maximum pulling force is 42.18KN (4.3 tons), which is converted into the radial clamping force of the chuck jaws (the angle between the chuck slider and the horizontal is 12°): 73.69N to 7400N, which is converted into kgf as 7.5 to 754.3kgf. The minimum radial clamping force can completely replace the film chuck.

[0101] The comprehensive performance advantages of the present invention are:

[0102] 1. High-speed performance: There are no components that restrict the speed of the machine tool. Unlike the rotary cylinder (pneumatic cylinder) with a maximum speed of only 4500RPM, which restricts the machining workpiece spindle (traditionally called the spindle) to less than 5000RPM, this system can achieve a higher workpiece spindle speed of 8000 to 9000 rpm (can use collets, CBN, PCD tools), which makes a huge contribution to improving machine tool efficiency.

[0103] 2. Ultra-high energy saving: save more than 99% of electricity, no need to use compressed gas or hydraulic oil.

[0104] 3. The tensioning force is steplessly adjustable: Dual-mode servo control is adopted, and the clamping force can be adjusted by programming in the machine tool program. The tensioning force of a set of equipment is steplessly adjustable from 3 kg to 5 tons.

[0105] 4. Environmental protection: Since there is no need to use hydraulic oil, the problem of hydraulic oil leakage and the environment being polluted is avoided.

[0106] 5. Strong adaptability: No need to consider the need to repeatedly replace hydraulic oils of different viscosities (winter, summer) due to climate change.

[0107] 6. Low maintenance rate: At present, more than 30% of the equipment maintenance work is the workload of the hydraulic station and the rotary cylinder, such as water ingress into the hydraulic station, motor maintenance (because it needs to run all the time), solenoid valve failure, high-pressure pipe damage, short life of the rotary cylinder, etc. However, this device does not require the above functional components, has a large design margin, and can achieve less or no maintenance.

[0108] 7. Low cost of use: Compared with the 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 bills and 1,000 yuan in hydraulic oil, saving a total of 5,500 yuan; compared with the hydraulic station + rotary cylinder system equipped with a 1.5KW motor, it saves nearly 1,000 yuan per year.

[0109] 8. Good environmental performance: The saved electric energy avoids the surrounding temperature rise and noise caused by the heating of traditional hydraulic oil, and improves the comfort of the workers' working environment.

[0110] 9. Low carbon: Save electricity and hydraulic oil, maintenance and other carbon emissions, belonging to green electromechanical products

[0111] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0112] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" etc. 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 this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[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 limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify 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 screw and a screw nut. The screw nut is matched with the screw. When the screw rotates, the screw nut can translate back and forth. The drive connection part is located at the input end of the screw, and the machine tool spindle fixing part is close to the output end of the screw. The first clutch mechanism enables the power connection part to be transmission-connected or disengaged from the screw.

2. The rotary force transmitter according to claim 1, characterized in that: It also includes a pull rod connecting shaft, one end of the screw nut is mounted with the pull rod connecting shaft, and the first clutch mechanism is partially connected to the power connecting part and partially connected to the screw.

3. The rotary force transmitter according to claim 1, characterized in that: It also includes a second clutch mechanism, a part of which is connected to the fixed part of the machine tool spindle, and a part of which is connected to the screw rod, so that when the fixed part of the machine tool spindle rotates, the screw rod is driven to rotate.

4. The rotary force transmitter according to claim 3, characterized in that: The first clutch mechanism and the second clutch mechanism both include a magnetic seat and a clutch member that can be connected or separated from each other. The magnetic seat has an energized electromagnetic coil, and the clutch member is connected or separated by energizing or de-energizing the magnetic seat.

5. The rotary force transmitter according to claim 3, characterized in that: The rotary force transmitter also includes a second mounting plate, and 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 screw rod of the rotary force transmitter.

6. The rotary force transmitter according to claim 3, characterized in that: The rotary force transmitter also includes a main housing, one end of which is used to fix the machine tool spindle, the main housing is sleeved outside the lead screw nut, and the main housing can rotate synchronously with the machine tool spindle; 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 a disconnected state. When in the engaged state, 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 in the disconnected state, the housing of the reducer and the input end of the reducer are disconnected from the synchronous rotation connection.

7. The rotary force transmitter according to claim 1, characterized in that: It also includes a reducer, which is arranged between the first clutch mechanism and the screw rod. The input end of the reducer and the power connection part are transmission-connected or transmission-disconnected through the first clutch mechanism, and the output end of the reducer is connected to the screw rod.

8. The rotary force transmitter according to claim 7, characterized in that: It also includes a second clutch mechanism, which is arranged between the input end of the reducer and the power connection part, and the input end of the reducer is transmission-connected or disengaged from the machine tool spindle fixing part through the second clutch mechanism; A protective shell is also arranged outside the rotary force transmitter, and the screw rod, screw rod nut, reducer, first clutch mechanism and second clutch mechanism are arranged inside the protective shell.

9. The rotary force transmitter according to claim 7, characterized in that: The rotary force transmitter also includes a main housing, and a positioning mechanism is also provided on the protective housing. The screw, the reducer, the first clutch mechanism and the second clutch mechanism are coaxially arranged with the main housing, and the positioning mechanism is used to adjust the position of the main housing and the protective housing and make the axes of the two fit together; The rotary force transmitter also includes a magnetic induction device, a part of which is fixedly arranged on the protective housing, and the other part of which moves axially synchronously with the screw nut, and the magnetic induction device is used to limit the axial stroke of the screw 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, and the second clutch mechanism includes a second clutch plate, a second rotating seat and a second magnetic seat; the first clutch plate is fixed on the power connection part, the second clutch plate is fixed on the housing of the reducer, the first rotating seat and the second rotating seat are mounted on and fixed on the reduction input shaft, the first magnetic seat can make the first clutch plate and the first rotating seat engage or disconnect; the second magnetic seat can make the second clutch plate and the second rotating seat engage or disconnect.

10. A machine tool, characterized in that: It comprises a driving motor assembly, a machine tool body, a chuck and a rotary force transmitter as claimed in claim 1, wherein the machine tool body comprises a pull rod and a spindle, the rotary force transmitter is connected to the pull rod of the machine tool body, the pull rod is used to drive the jaws of the chuck to open and close, the driving motor assembly and the rotary force transmitter can be connected or disconnected in transmission, and the rotary force transmitter and the spindle of the machine tool body can be connected or disconnected in transmission; When it is necessary to clamp or loosen the workpiece, the drive motor assembly is connected to the rotary force transmitter, and the rotary force transmitter is disconnected from the main shaft of the machine tool body. At this time, the drive motor assembly can drive the pull rod to move forward and backward along the axial direction through the rotary force transmitter, so that the clamping jaws of the chuck open and close; When it is necessary to process the workpiece, the driving motor assembly and the rotary force transmitter are disconnected from the transmission connection, and the rotary force transmitter is connected to the main shaft of the machine tool body. When the main shaft of the machine tool body rotates, the clamping jaws of the chuck are driven to rotate.

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