Rotary force transmission device and machine tool

Abstract

The utility model provides a rotation force transmission device and a machine tool, the rotation force transmission device comprises a power connecting part, a machine tool main shaft fixing part, a second 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, when the screw rod rotates, the screw rod nut can translate back and forth, the driving connecting part is located at the input end of the screw rod, and the pull rod connecting shaft is located at the output end of the screw rod. And the second clutch mechanism drives the screw rod to rotate when the machine tool main shaft fixing part rotates. According to the rotary force transmission device, when the machine tool spindle fixing part rotates, the screw rod can be driven to rotate, and the service life and stability of a machine tool during high-rotating-speed work can be guaranteed.

Description

Technical Field

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

[0002] A chuck or collet is a mechanical device used to clamp a workpiece on a machine tool. 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, a movable jaw, and a jaw drive motor assembly. The chuck body has a minimum diameter of 65 mm and a maximum diameter 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 that 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 utility model provides a rotary force transmitter, comprising a power connection part, a machine tool spindle fixing part, a second clutch mechanism, a screw rod, a screw rod nut and a pull rod connecting shaft, wherein the screw rod nut is matched with the screw rod, and the screw rod nut can translate back and forth when the screw rod rotates, the drive connection part is located at the input end of the screw rod, and the second clutch mechanism drives the screw rod to rotate when the machine tool spindle fixing part rotates.

[0006] Preferably, a part of the second clutch mechanism is connected to the fixed part of the machine tool spindle, and a part of the second clutch mechanism is connected to the screw rod;

[0007] The second clutch mechanism includes a second rotating seat and a second clutch plate which can be connected or separated from each other, the second clutch plate is connected to the fixed part of the machine tool spindle, and the second rotating seat is connected to the screw rod and can rotate with the screw rod.

[0008] Preferably, the second clutch mechanism comprises a magnetic seat and a clutch member that can be connected or separated from each other, and the connection or separation of the clutch member is controlled by energizing or de-energizing the magnetic seat.

[0009] The rotary force transmitter comprises a second mounting plate, and the magnetic seat is fixed to one side of the second mounting plate and does not move with the screw rod.

[0010] Preferably, the second clutch mechanism can adopt electromagnetic clutch or mechanical clutch;

[0011] The rotary force transmitter and the main shaft of the machine tool are transmission-connected or transmission-disconnected via a second clutch mechanism.

[0012] Preferably, the second clutch mechanism includes a second magnetic seat, a second rotating seat and a second clutch plate, the second clutch plate is connected to the fixed part of the machine tool spindle, the second rotating seat is connected to the screw rod, and the second magnetic seat is powered on or off to control the connection or separation of the second rotating seat and the second clutch plate.

[0013] Preferably, the rotary force transmitter further comprises a first clutch mechanism, which enables the power connection part to be transmission-connected or disengaged from the screw rod.

[0014] Preferably, the pull rod connecting shaft is installed at one end of the screw nut, the machine tool spindle fixing part is close to the screw output end, and the first clutch mechanism is partially connected to the power connecting part and partially connected to the screw, so that the power connecting part is transmission-connected or disengaged from the screw.

[0015] Preferably, the first clutch mechanism includes a first rotating seat and a first clutch plate which can be connected or separated from each other, the first clutch plate is connected to the power connection part, the first rotating seat is connected to the screw rod and can rotate with the screw rod, when the first rotating seat and the first clutch plate are connected, the power connection part can drive the screw rod to rotate; when the first rotating seat and the first clutch plate are separated, the power connection part and the screw rod are disengaged from the transmission connection.

[0016] Preferably, the power connection part can be transmission-connected to or disengaged from the screw rod, and when the machine tool spindle fixing part rotates to drive the screw rod to rotate, the power connection part is transmission-disconnected from the screw rod.

[0017] The utility model also provides a machine tool, including the rotary force transmitter, a driving mechanism and a machine tool body, the power connection part is used to install the driving mechanism, the driving mechanism is connected to the screw rod, the machine tool body includes a pull rod and a spindle, the pull rod is connected to the pull rod connecting shaft, the spindle is connected to the machine tool spindle fixing part, the rotary force transmitter can be disconnected from the transmission connection with the spindle of the machine tool body, the driving mechanism can drive the pull rod to move axially forward and backward through the rotary force transmitter, the rotary force transmitter can be connected to the spindle of the machine tool body, so that the rotary force transmitter and the spindle of the machine tool are combined, and the rotary force transmitter can rotate synchronously with the rotation of the spindle of the machine tool.

[0018] The rotary force transmitter provided by the utility model can drive the screw rod to rotate when the fixed part of the main shaft of the machine tool rotates, thereby ensuring the service life and stability of the machine tool when working at a high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other purposes, features and advantages of the present invention will become clearer through a 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, but the focus is on illustrating the main purpose of the present invention.

[0020] Figure 1 A schematic diagram of a machine tool mechanism provided by the utility model;

[0021] Figure 2 A schematic diagram of the cross-sectional structure of a machine tool provided by the utility model;

[0022] Figure 3 It is a schematic diagram of the enlarged structure of part A in 2;

[0023] Figure 4 A schematic diagram of the structure of the rotary force transmitter provided by the utility model;

[0024] Figure 5 for Figure 4 A schematic diagram of the structure of part B in the middle is enlarged;

[0025] Figure 6 for Figure 4 Schematic diagram of the enlarged structure of part C in the middle. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the relevant drawings.

[0027] 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.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly 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.

[0029] refer to Figure 1-6The utility model provides a rotary force transmitter, which includes 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 a driving mechanism such as a motor, the pull rod connecting shaft 23 is used to connect the pull rod 42, and the machine tool spindle fixing part is used to directly or indirectly connect to the machine tool spindle 41, so that when the machine tool spindle 41 rotates, it will drive the machine tool spindle fixing part to rotate.

[0030] The rotary force transmitter provided by the utility model has a power connection part, which can be used to connect with the drive motor assembly 1, and provides a way to drive the chuck to open and close by providing power through the motor. Compared with the hydraulic drive, the motor drive is more environmentally friendly, does not need to use hydraulic oil, avoids the problem of hydraulic oil dripping and the environment, and no longer needs to consider the need to repeatedly replace (winter, summer) hydraulic oil of different viscosities due to climate change, and avoids the surrounding environment temperature rise and noise caused by the heating of traditional hydraulic oil. Improves the comfort of the workers' working environment.

[0031] The traditional cylinder drive has a low limit speed, and the speed is difficult to exceed 4500RPM, which restricts the rotation of the machine tool's spindle and makes it impossible to improve the machine tool's work efficiency. Compared with the cylinder drive, the motor drive can achieve a higher speed of the machine tool, providing the possibility of improving the machine tool's work efficiency.

[0032] The rotary force transmitter of the utility model has a second clutch mechanism, which can drive the screw 21 to rotate when the fixed part of the machine tool spindle rotates, so that the rotary force transmitter is designed as an associated component connected to the spindle of the machine tool, and the main parts can rotate with the spindle of the machine tool. The axial force generated when the push / pull action occurs will be directly applied to the spindle of the machine tool, rather than being carried by the bearing, so the structure has higher reliability. The second clutch mechanism can connect or disconnect the rotary force transmitter with the spindle 41 of the machine tool. When the second clutch mechanism connects the rotary force transmitter with the spindle 41 of the machine tool, the spindle 41 of the machine tool will rotate when the spindle 41 of the machine tool rotates, and the spindle fixed part of the machine tool drives the screw 21 to rotate together, so that when the spindle 41 of the machine tool rotates, the rotary force transmitter will rotate accordingly. The second clutch mechanism can combine the spindle fixed part of the machine tool with the screw 21, so that the screw 21 rotates with the spindle fixed part of the machine tool. When the machine tool processes a workpiece, the screw 21 will not move independently relative to the main shaft 41 of the machine tool, and the rotary force transmitter will rotate with the main shaft 41 of the machine tool as a whole, which can avoid the concentration of the force on a certain component connected to the screw (such as a bearing) when the main shaft of the machine tool is running at high speed, and can ensure the life and stability of the machine tool when working at a high speed, and can ensure that the rotary force transmitter can be used for high-speed machine tool processing. Further, a machine tool with a speed of 8000-9000RPM can be realized.

[0033] The screw nut 22 provided by the utility model is connected with the pull rod 42. When the driving motor drives the screw 21 to rotate, the screw nut 22 is driven to translate forward and backward, and the screw nut 22 drives the pull rod 42 to move, so as to realize the opening and closing of the clamping jaws, clamping or loosening the workpiece. After the workpiece is clamped, when the main shaft 41 of the machine tool rotates, the fixed part of the main shaft of the machine tool is driven to rotate. Through the action of the second clutch mechanism, when the fixed part of the main shaft of the machine tool rotates, the screw 21 is driven to rotate accordingly, so as to ensure the synchronization of the movement of the screw 21 and the main shaft 41 of the machine tool, and ensure that the screw 21 will not move independently during the processing of the workpiece, thereby avoiding the opening of the clamping jaws during the processing, making the stability of the machine tool processing better, and further improving the stability of the machine tool when it rotates at high speed.

[0034] In a preferred embodiment, a part of the second clutch mechanism is directly or indirectly connected to the machine tool spindle fixing part, and a part of the second clutch mechanism is directly or indirectly connected to the screw rod 21. The second clutch mechanism can connect the machine tool spindle fixing part and the screw rod 21, ensuring that the screw rod 21 will follow the rotation of the machine tool spindle fixing part, and the screw rod 21 will not rotate independently relative to the machine tool spindle fixing part.

[0035] In a preferred embodiment, the second clutch mechanism can adopt electromagnetic clutch or mechanical clutch, so that the rotary force transmitter and the main shaft 41 of the machine tool are connected or disconnected through the second clutch mechanism, and the screw rod 21 can be driven to rotate when the fixed part of the main shaft of the machine tool rotates, and most of the rotary force transmitter follows the rotation of the main shaft of the machine tool. When the rotary force transmitter and the main shaft 41 of the machine tool are disconnected from the transmission connection, when the main shaft of the machine tool rotates, the fixed part of the main shaft of the machine tool is driven to rotate, but the rotary force transmitter of the screw rod 21 part will not be driven to rotate, and the screw rod can rotate independently relative to the fixed part of the main shaft of the machine tool.

[0036] In a preferred embodiment, the second clutch mechanism includes a magnetic base and a clutch member that can be connected or separated from each other.

[0037] One of the clutch components is directly or indirectly connected to the fixed part of the machine tool spindle, and the other clutch component is directly or indirectly connected to the screw rod 21. The connection or separation of the clutch component is controlled by energizing or de-energizing the magnetic seat, thereby controlling the rotation of the fixed part of the machine tool spindle to drive the screw rod 21 to rotate. The clutch component of the second clutch mechanism may include a second rotating seat 362 and a second clutch plate 352.

[0038] In a preferred embodiment, the second clutch mechanism includes a second rotating seat 362 and a second clutch plate 352 which can be connected or separated from each other, the second clutch plate 352 is connected to the fixed part of the machine tool spindle, and the second rotating seat 362 is connected to the screw rod 21 and can rotate with the screw rod 21. When the machine tool spindle rotates, the fixed part of the machine tool spindle is driven to rotate, and then the second clutch plate 352 is driven to rotate. The second rotating seat 362 is directly or indirectly connected to the screw rod 21. When the second clutch plate 352 and the second rotating seat 362 are connected, the machine tool spindle can drive the screw rod 21 to rotate, so that the screw rod 21 and the machine tool spindle rotate synchronously.

[0039] In a preferred embodiment, the second clutch mechanism includes a second magnetic seat, a second rotating seat 362 and a second clutch plate 352. The second clutch plate 352 is connected to the fixed part of the machine tool spindle. The second rotating seat 362 is directly or indirectly connected to the screw rod 21. The second magnetic seat is powered on or off to control the connection or separation of the second rotating seat 362 and the second clutch plate 352.

[0040] In a preferred embodiment, when the second rotating seat 362 and the second clutch plate 352 are disconnected, there is a gap between the second rotating seat 362 and the second clutch plate 352, and the gap is 0.1-1 mm.

[0041] In a preferred embodiment, the power connection part can be transmission-connected or disengaged with the screw 21. When the fixed part of the machine tool spindle rotates to drive the screw 21, the power connection part is disengaged from the screw 21. The machine tool spindle drives the rotary force transmitter to transmit when it rotates at high speed, but the power connection part does not rotate and therefore does not rotate with the externally connected drive motor assembly. The winding problem when the machine tool rotates at high speed can be avoided, and the operation of the high-speed machine tool can be further guaranteed, so that the rotary force transmitter provided by the utility model is more suitable for high-speed motors than the existing electric force transmitter. When the power connection part can be transmission-connected with the screw 21, the drive motor assembly and the screw 21 are transmission-connected, driving the pull rod 42 to move, thereby realizing the opening and closing of the clamping jaws.

[0042] In a preferred embodiment, the rotary force transmitter further includes a first clutch mechanism, and the first clutch mechanism is used to make the power connection part and the screw rod 21 transmission-connected or disengaged from the transmission connection.

[0043] In a preferred embodiment, the first clutch mechanism is partially connected to the power connection part, and partially connected to the screw 21 directly or indirectly, so that the power connection part is in transmission connection or out of transmission connection with the screw 21. The power connection part can drive the screw 21 to rotate, at which time the rotary force transmitter and the main shaft 41 of the machine tool are out of transmission connection, and the screw 21 moves independently relative to the fixed part of the main shaft of the machine tool. The rotation of the screw 21 drives the pull rod of the machine tool to move, so that the clamping claw opens and closes to clamp the workpiece. After clamping the workpiece, when processing is required, the power connection part and the screw 21 are out of transmission connection, the main shaft 41 of the machine tool drives the rotary force transmitter to rotate, and the rotary force transmitter drives the screw to rotate synchronously through the second clutch mechanism, and the screw does not rotate independently.

[0044] In a preferred embodiment, the first clutch mechanism includes a first rotating seat and a first clutch plate that can be connected or separated from each other, the first clutch plate is connected to the power connection part, the first rotating seat is connected to the screw rod 21, and can rotate with the screw rod 21. When the first rotating seat and the first clutch plate are connected, the power connection part can drive the screw rod 21 to rotate, at this time, the rotary force transmitter and the main shaft 41 of the machine tool are disconnected from the transmission connection, and the screw rod 21 rotates to open and close the clamping jaws and move independently relative to the main shaft 41 of the machine tool. When the workpiece is clamped and needs to be processed, the first rotating seat and the first clutch plate are separated, the power connection part and the screw rod 21 are disconnected from the transmission connection, and the main shaft 41 of the machine tool drives the rotary force transmitter to rotate.

[0045] In a preferred embodiment, a pull rod connecting shaft is installed at one end of the screw nut 22, or the pull rod connecting shaft can be integrated with the screw nut 22.

[0046] In a preferred embodiment, the machine tool spindle fixing part is closer to the output end of the screw rod 21 relative to the power connection part, and the power connection part is closer to the input end of the screw rod 21. The input end of the screw rod 21 referred to in this embodiment refers to the end close to the drive motor, and the output end refers to the end close to the machine tool.

[0047] In a preferred embodiment, the screw rod 21 and the machine tool spindle fixing part are connected by a bearing. When the power connection part is connected to the screw rod 21 in transmission, the drive motor assembly drives the screw rod 21 to rotate. Because of the bearing, it is not affected by the machine tool spindle fixing part, and the screw rod 21 rotates more smoothly.

[0048] In a preferred embodiment, the screw rod 21 is installed at the center of the rotary force transmitter 2 through a bearing 311, and serves as a power input shaft, which can rotate synchronously with the reducer to provide push / pull force.

[0049] 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 and prevent the screw nut from sliding out and falling off due to over-travel. The pull rod connecting shaft 23 is connected to the screw nut at one end by a thread, and is connected to the pull rod 42 in the machine tool spindle 41 at the other end, which is used to transmit push / pull force, so that the clamping jaws open or close, and clamp or loosen the workpiece. The pull rod connecting shaft 23 can also be a part of the screw nut 22, and it is not necessary to set up the pull rod connecting shaft 23 additionally, as long as it can be connected to the pull rod of the machine tool.

[0050] 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.

[0051] 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.

[0052] The rotary force transmitter of the utility model further includes a second mounting plate 25 , a support plate 26 , a first flange fixing bolt 27 , a first flange 28 , and a protective plate 33 .

[0053] 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.

[0054] In a preferred embodiment, the first clutch mechanism and the second clutch mechanism may adopt electromagnetic clutch or mechanical clutch.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] refer to Figure 4-5 In 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.

[0060] 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.

[0061] The specific working principle of the first clutch mechanism (taking the normally open structure as an example) is as follows:

[0062] 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.

[0063] In reference Figure 4-6 In 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.

[0064] The second rotating seat 362 is fixedly mounted on the middle side of one end of the screw input shaft by a key, and can transfer the kinetic energy (torque) from the screw to the second clutch plate.

[0065] 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 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.

[0066] The specific working principle of the second clutch mechanism is as follows:

[0067] 1. Normally open structure

[0068] 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.

[0069] 2. Normally closed structure

[0070] 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.

[0071] The utility model designs the rotary force transmission part as an associated rotary force transmission device which is mounted inside the main shaft of the machine tool. The main parts can rotate with the main shaft. The axial force generated when the push / pull action occurs will be directly applied to the main shaft of the machine tool instead of being carried by the bearing. Therefore, the structure has higher reliability.

[0072] refer to Figure 1-3 This 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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 second 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. When the screw rod rotates, the screw rod nut can translate back and forth. The power connection part is located at the input end of the screw rod. The second clutch mechanism drives the screw rod to rotate when the machine tool spindle fixing part rotates.

2. The rotary force transmitter according to claim 1, characterized in that: A portion of the second clutch mechanism is connected to the fixed portion of the machine tool spindle, and a portion of the second clutch mechanism is connected to the screw rod; The second clutch mechanism includes a second rotating seat and a second clutch plate which can be connected or separated from each other, the second clutch plate is connected to the fixed part of the machine tool spindle, and the second rotating seat is connected to the screw rod and can rotate with the screw rod.

3. The rotary force transmitter according to claim 1, characterized in that: The second clutch mechanism includes a magnetic base and a clutch member that can be connected or separated from each other, and the clutch member is controlled to be connected or separated by energizing or de-energizing the magnetic base. The rotary force transmitter comprises a second mounting plate, and the magnetic seat is fixed to one side of the second mounting plate and does not move with the screw rod.

4. The rotary force transmitter according to claim 1, characterized in that: The second clutch mechanism may adopt electromagnetic clutch or mechanical clutch; The rotary force transmitter and the main shaft of the machine tool are transmission-connected or transmission-disconnected via a second clutch mechanism.

5. The rotary force transmitter according to claim 1, characterized in that: The second clutch mechanism includes a second magnetic seat, a second rotating seat and a second clutch plate, the second clutch plate is connected to the fixed part of the machine tool spindle, the second rotating seat is connected to the screw rod, and the second magnetic seat is powered on or off to control the connection or separation of the second rotating seat and the second clutch plate.

6. The rotary force transmitter according to claim 1, characterized in that: The rotary force transmitter also includes a first clutch mechanism, which enables the power connection part to be transmission-connected or disengaged from the screw rod.

7. The rotary force transmitter according to claim 6, characterized in that: The pull rod connecting shaft is installed at one end of the screw nut, the machine tool spindle fixing part is close to the screw output end, and the first clutch mechanism is partially connected to the power connecting part and partially connected to the screw, so that the power connecting part is transmission-connected or disengaged from the screw.

8. The rotary force transmitter according to claim 6, characterized in that: The first clutch mechanism includes a first rotating seat and a first clutch plate which can be connected or separated from each other, the first clutch plate is connected to a power connection part, the first rotating seat is connected to a screw rod and can rotate with the screw rod, when the first rotating seat and the first clutch plate are connected, the power connection part can drive the screw rod to rotate; when the first rotating seat and the first clutch plate are separated, the power connection part and the screw rod are disengaged from the transmission connection.

9. The rotary force transmitter according to claim 1, characterized in that: The power connection part can be transmission-connected with or disengaged from the screw rod. When the machine tool spindle fixing part rotates to drive the screw rod to rotate, the power connection part is disengaged from the screw rod.

10. A machine tool, characterized in that: It includes a rotary force transmitter, a driving mechanism and a machine tool body as described in any one of claims 1 to 9, the power connection part is used to install the driving mechanism, the driving mechanism is connected to the screw, the machine tool body includes a pull rod and a spindle, the pull rod is connected to the pull rod connecting shaft, and the spindle is connected to the machine tool spindle fixing part, the rotary force transmitter can be disconnected from the transmission connection with the spindle of the machine tool body, the driving mechanism can drive the pull rod to move axially forward and backward through the rotary force transmitter, the rotary force transmitter can be connected to the spindle of the machine tool body, so that the rotary force transmitter and the spindle of the machine tool are combined, and the rotary force transmitter can rotate synchronously with the rotation of the spindle of the machine tool.

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