Rotary force transmission device

Abstract

The utility model provides a rotary force transmission device, which comprises a power connecting part, a machine tool spindle fixing part, a screw rod, a screw rod nut, a speed reducer and a pull rod connecting shaft, the screw rod nut is matched with the screw rod, the screw rod nut can translate back and forth when the screw rod rotates, the power connecting part is positioned at the input end of the screw rod, and the speed reducer is positioned at the output end of the screw rod. The machine tool spindle fixing part is close to the output end of the lead screw, the power connecting part can be in transmission connection with the lead screw or be separated from the transmission connection with the lead screw, and the machine tool spindle fixing part can drive the lead screw to rotate when rotating. The rotary force transmission device provided by the utility model 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 utility model relates to the technical field of chuck driving, in particular to a rotary force transmitter. 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 screw rod, a screw rod nut, a reducer 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 power connection part is located at the input end of the screw rod, and the machine tool spindle fixing part is close to the screw rod output end, the power connection part can be connected to or disconnected from the screw rod transmission connection, and the screw rod can be driven to rotate when the machine tool spindle fixing part rotates.

[0006] Preferably, when the machine tool spindle fixing part drives the screw rod to rotate, the power connection part is disconnected from the screw rod.

[0007] Preferably, the rotary force transmitter also includes a clutch mechanism and a connecting shaft, the clutch mechanism is used to connect or disconnect the power connection part from the screw rod transmission connection, or the clutch mechanism is used to drive the screw rod to rotate when the machine tool spindle fixing part rotates; the power connection part, connecting shaft, reducer, screw rod and screw rod nut can be transmission connected in sequence, and the clutch mechanism is closer to the power connection part than the reducer.

[0008] Preferably, the connecting shaft, the reducer and the screw rod constitute a transmission shaft, and the clutch mechanism includes a first clutch mechanism and a second clutch mechanism, the first clutch mechanism is used to make the power connection part and the screw rod transmission connection or disengage the transmission connection, the second clutch mechanism is used to drive the screw rod to rotate when the machine tool spindle fixing part rotates, one part of the first clutch mechanism is connected to the transmission shaft, and one part is connected to the power connection part, and one part of the second clutch mechanism is connected to the machine tool spindle fixing part, and the other part is connected to the transmission shaft.

[0009] Preferably, the reducer is located between the connecting shaft and the screw rod, and the clutch mechanism includes a magnetic seat and a clutch member that can be connected or separated from each other, and a part of the clutch member is connected to the connecting shaft and can rotate with the connecting shaft.

[0010] Preferably, the rotary force transmitter further comprises a first clutch mechanism, which enables the power connection part to be transmission-connected with or disengaged from the screw rod; the first clutch mechanism is partially connected to the power connection part and partially connected to the screw rod.

[0011] Preferably, the pull rod connecting shaft is mounted on one end of the screw nut.

[0012] Preferably, the rotary force transmitter also includes a first clutch mechanism and a second clutch mechanism, wherein the first clutch mechanism enables the power connection part to be connected to or disconnected from the screw transmission connection, and the second clutch mechanism drives the screw to rotate when the machine tool spindle fixing part rotates, and 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, and the connection or separation of the clutch member is controlled by powering on or off the magnetic seat.

[0013] Preferably, the clutch member of 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.

[0014] Preferably, the rotary force transmitter further comprises a mounting plate, the first clutch mechanism and the second clutch mechanism both comprise a magnetic seat and a clutch member that can be connected or separated from each other, the connection or separation of the clutch member is controlled by energizing or de-energizing the magnetic seat, and the magnetic seats of the first clutch mechanism and the second clutch mechanism are respectively fixed on both sides of the mounting plate and do not move with the screw rod;

[0015] When the clutch plate of the first clutch mechanism is separated, the clutch plate of the second clutch mechanism is connected; when the clutch of the first clutch mechanism is connected, the clutch plate of the second clutch mechanism is separated.

[0016] The rotary force transmitter provided by the utility model can be directly mounted inside the main shaft of a machine tool as a related component, and the structure has better reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 A schematic diagram of a machine tool mechanism provided by the utility model;

[0019] Figure 2 A schematic diagram of the cross-sectional structure of a machine tool provided by the utility model;

[0020] Figure 3 It is a schematic diagram of the enlarged structure of part A in 2;

[0021] Figure 4 A schematic diagram of the structure of the rotary force transmitter provided by the utility model;

[0022] Figure 5 for Figure 4 A schematic diagram of the structure of part B in the middle is enlarged;

[0023] Figure 6 for Figure 4 Schematic diagram of the enlarged structure of part C in the middle.

[0024] Figure 7 A schematic diagram of the internal structure of a rotary force transmitter provided in another embodiment of the utility model.

[0025] Figure 8 for Figure 7 Enlarged schematic diagram of part "f" in the figure. 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 1-8 The utility model provides a rotary force transmitter, which includes a first clutch mechanism, a screw 21, a screw nut 22, a reducer, a tie rod connecting shaft 23, a power connection part, and a machine tool spindle fixing part. The power connection part is located at the input end of the screw, and the power connection part is used to install a driving mechanism such as a motor, and the driving mechanism provides power for the rotation of the screw. The tie rod connecting shaft 23 is used to connect the tie rod 42 of the machine tool to transmit the force of the screw to the tie rod 42. The machine tool spindle fixing part is close to the output end of the screw, and the machine tool spindle fixing part is used to directly or indirectly connect the spindle 41 of the machine tool. The screw nut 22 is matched with the screw 21. When the screw 21 rotates, it drives the screw nut 22 to translate forward and backward. The screw nut 22 drives the pull rod 42 of the machine tool to move through the tie rod connecting shaft 23, thereby realizing the opening and closing of the driving chuck, and realizing the clamping of the workpiece to be processed by the machine tool.

[0030] The rotary force transmitter provided by the utility model has a power connection portion, which can be used to connect with the drive motor assembly 1, and provides a method of driving the chuck to open and close by providing power through the motor.

[0031] Compared with hydraulic drive, motor drive is more environmentally friendly, does not require the use of hydraulic oil, avoids the problem of hydraulic oil dripping and the environment, no longer needs to consider the repeated replacement of hydraulic oil with different viscosities (winter and summer) due to climate change, and avoids the surrounding environment temperature rise and noise caused by the heating of traditional hydraulic oil. It improves the comfort of workers' working environment.

[0032] 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.

[0033] The rotary force transmitter provided in this embodiment can be connected to or disconnected from the transmission connection with the screw rod. When the power connection part is connected to the screw rod, the motor drives the power connection part to rotate, thereby driving the screw rod to rotate and drive the pull rod to realize the opening and closing of the chuck. When the workpiece is clamped and needs to be processed, the power connection part is disconnected from the screw rod, the motor will not transmit force to the screw rod, and the screw rod will not drive the pull rod to move, so that the chuck will not loosen, ensuring that the workpiece can be stably clamped for processing.

[0034] The rotary force transmitter provided in this embodiment is designed as an associated component, which is connected to the machine tool through the machine tool spindle fixing part. When connected to the machine tool, it is connected to the machine tool's pull rod 42 through the pull rod connecting shaft 23. When the power connection part is connected to the screw drive, the motor drives the power connection part to drive the screw to rotate, and the screw rotation drives the screw nut to move, and further drives the pull rod movement through the pull rod connecting shaft to realize the opening and closing of the chuck. In this embodiment, when the machine tool spindle fixing part rotates, it can drive the screw to rotate. The machine tool spindle fixing part is used to connect with the machine tool spindle. When the machine tool spindle rotates, it will drive the machine tool spindle fixing part to rotate, so that the screw follows the movement, that is, most parts of the rotary force transmitter rotate with the rotation of the machine tool spindle. The axial force generated when the push / pull action occurs will be directly applied to the machine tool spindle, rather than simply carried by the bearing. Therefore, the structure has higher reliability, and the force is not simply applied to the bearing, which can make the equipment more stable and have a higher lifespan, and the machine tool can achieve a higher speed. It can be used on workpiece spindles with a speed of 8000-9000 rpm (can use collets, CBN, PCD tools), which makes a huge contribution to improving machine tool efficiency.

[0035] refer to Figure 1-8 In a preferred embodiment, when the workpiece needs to be clamped, the power connection part is connected to the screw rod 21, and the motor drives the screw rod 21 to rotate, further driving the pull rod 42 to move, so as to realize the opening and closing of the chuck. When the workpiece needs to be processed after being clamped, the fixed part of the machine tool spindle drives the screw rod 24 to rotate, and the power connection part is disconnected from the screw rod 24, so that the spindle of the machine tool drives the rotary force transmitter to rotate synchronously when the spindle rotates at a high speed, but does not drive the motor to rotate, which can better solve the problem of motor winding when the machine tool rotates at a high speed, greatly improve the rotation speed of the machine tool, and ensure the stability and life of the motor.

[0036] In a preferred embodiment, a tie rod connecting shaft is installed at one end of the screw nut. Or the tie rod connecting shaft is a part of the screw nut, and the tie rod connecting shaft mainly serves as a tie rod connecting the motor, which can be installed at one end of the tie rod nut, or can be a part of the tie rod nut itself.

[0037] refer to Figure 1 —6. In one preferred embodiment, the reducer is located outside the power connection part, so that the entire conveying shaft length is shorter and the structure is simpler.

[0038] refer to Figure 7-8In another preferred embodiment, the rotary force transmitter further includes a clutch mechanism and a connecting shaft 201. The clutch mechanism referred to herein may be a first clutch mechanism for connecting or disconnecting the power connection portion from the screw 21, or may be a second clutch mechanism for driving the screw 21 to rotate when the fixed portion of the machine tool spindle rotates. In this embodiment, the power connection portion, the connecting shaft 201, the reducer 202, the screw 21 and the screw nut 22 may be sequentially connected in transmission, and the clutch mechanism is closer to the power connection portion than the reducer 202, that is, the first clutch mechanism and / or the second clutch mechanism is closer to the power connection portion than the reducer 202. By arranging the reducer 202 at the rear end of the clutch mechanism, the clutch mechanism is subjected to a smaller torque and has a better structural stability.

[0039] refer to Figure 7-8 In a further preferred embodiment, the connecting shaft 201, the reducer 202 and the screw 21 form a transmission shaft, and the clutch mechanism includes a first clutch mechanism and a second clutch mechanism, a part of the first clutch mechanism is connected to the transmission shaft, and a part is connected to the power connection part, and the first clutch mechanism is used to make the power connection part and the screw 21 transmission connection or disengagement connection, and a part of the second clutch mechanism is connected to the machine tool spindle fixing part, and another part is connected to the transmission shaft. The second clutch mechanism is used to drive the screw 21 to rotate when the machine tool spindle fixing part rotates.

[0040] refer to Figure 7-8 In a further preferred embodiment, the reducer 202 is located between the connecting shaft 201 and the screw rod 21, and the clutch mechanism includes a magnetic seat and a clutch member that can be connected or separated from each other. Part of the clutch member is connected to the connecting shaft and can rotate with the connecting shaft.

[0041] In this embodiment, the power connection part can be connected to or disconnected from the screw rod 21 by electromagnetic means or mechanical means.

[0042] In this embodiment, when the machine tool spindle fixing part rotates, the screw rod 21 can be driven to rotate. The machine tool spindle fixing part and the screw rod 21 can be connected by electromagnetic attraction, or other methods can be used to lock the machine tool spindle fixing part and the screw rod 21. This ensures that when the workpiece is processed, the screw rod 21 rotates synchronously with the machine tool spindle and does not move independently.

[0043] refer to Figure 1-6 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.

[0044] refer to Figure 1-6The 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.

[0045] refer to Figure 1-8 The pull rod connecting shaft 23 is connected to the screw nut at one end and the pull rod 42 in the machine tool spindle 41 at the other end through a threaded manner, which is used to transmit push / pull force.

[0046] The power connection part referred to in this embodiment is mainly used to connect with the motor. Figure 1-6 In the embodiment, 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. Figure 7 The part that connects the motor 11 and the connecting shaft 201 is the power connection part.

[0047] The machine tool spindle fixing part referred to in this embodiment is mainly used to connect the spindle of the machine tool, such as Figure 7 The main housing 5 included in the embodiment can be connected to the main shaft 41 of the machine tool and is also a part of the main shaft fixing part of the machine tool. Figure 1-6 , the fixed part of the main shaft of the machine tool 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 on 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 on the bearing mounting seat 31 by bolts, and can press and position the bearing 311.

[0048] refer to Figure 1-6 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 .

[0049] refer to Figure 1-6The 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 bolts 27 are 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.

[0050] In a preferred embodiment, the first clutch mechanism and the second clutch mechanism may adopt electromagnetic clutch or mechanical clutch.

[0051] refer to Figure 1-8 In a 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.

[0052] In a preferred embodiment, when the clutch plate of the first clutch mechanism is separated, the clutch plate of the second clutch mechanism is connected; when the clutch of the first clutch mechanism is connected, the clutch plate of the second clutch mechanism is separated. When the clutch plate of the first clutch mechanism is connected, the motor drives the lead screw to move independently to realize the opening and closing of the clamping jaws. At this time, the clutch plate of the second clutch mechanism is separated, so that the main shaft of the motor will not drive the lead screw to rotate, and will not interfere with the independent movement of the lead screw. When processing the workpiece, the clutch plate of the first clutch mechanism is separated, and the connection between the motor and the lead screw is disconnected. When the clutch plate of the second clutch mechanism is connected to the main shaft of the machine tool, it drives the lead screw to rotate synchronously, so that the force is applied on the machine tool, the stability is better, and the lead screw is driven by the main shaft of the machine tool to rotate synchronously, ensuring that the lead screw will not move independently, which can better avoid the pull rod activity causing the clamping jaw to loosen.

[0053] 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 seat is energized to connect the clutch, and the clutch is separated when the power is not supplied; in the normally closed structure, the magnetic seat is energized to separate the clutch, and the clutch is connected when the power is not supplied.

[0054] 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.

[0055] refer to Figure 4 and Figure 7In 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.

[0056] refer to Figure 4-5 In a preferred embodiment, the first clutch mechanism is partially connected to the power connection part and partially connected to the screw rod 2, so that the first clutch mechanism can realize the power connection part to be transmission connected or disconnected from the screw rod.

[0057] refer to Figure 1-8 In a further 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 a material with good magnetic conductivity is used. 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.

[0058] 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.

[0059] The specific working principle of the first clutch mechanism (taking the normally open structure as an example) is as follows:

[0060] 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.

[0061] 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 rod 21 of the rotary force transmitter 2 and can rotate with the screw rod 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.

[0062] 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.

[0063] 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.

[0064] The specific working principle of the second clutch mechanism is as follows:

[0065] 1. Normally open structure

[0066] 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.

[0067] 2. Normally closed structure

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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 screw, a screw nut, a reducer and a pull rod connecting shaft. The screw nut is matched with the screw. When the screw rotates, the screw nut can translate back and forth. The power connection part is located at the input end of the screw, and the machine tool spindle fixing part is close to the screw output end. The power connection part can be connected to or disconnected from the screw transmission connection. When the machine tool spindle fixing part rotates, the screw can be driven to rotate.

2. The rotary force transmitter according to claim 1, characterized in that: When the machine tool spindle fixing part drives the screw rod to rotate, the power connection part is disconnected from the screw rod.

3. The rotary force transmitter according to claim 1, characterized in that: The rotary force transmitter also includes a clutch mechanism and a connecting shaft. The clutch mechanism is used to connect or disconnect the power connection part from the screw rod transmission connection, or the clutch mechanism is used to drive the screw rod to rotate when the machine tool spindle fixing part rotates; the power connection part, connecting shaft, reducer, screw rod and screw rod nut can be connected in sequence, and the clutch mechanism is closer to the power connection part than the reducer.

4. The rotary force transmitter according to claim 3, characterized in that: The connecting shaft, reducer and screw rod constitute a transmission shaft, and the clutch mechanism includes a first clutch mechanism and a second clutch mechanism. The first clutch mechanism is used to make the power connection part and the screw rod transmission connection or disengage the transmission connection, and the second clutch mechanism is used to drive the screw rod to rotate when the machine tool spindle fixing part rotates. One part of the first clutch mechanism is connected to the transmission shaft, and another part is connected to the power connection part. One part of the second clutch mechanism is connected to the machine tool spindle fixing part, and the other part is connected to the transmission shaft.

5. The rotary force transmitter according to claim 3, characterized in that: The reducer is located between the connecting shaft and the lead screw, and the clutch mechanism comprises a magnetic seat and a clutch member that can be connected or separated from each other. A part of the clutch member is connected to the connecting shaft and can rotate with the connecting shaft.

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 with or disengaged from the screw rod; the first clutch mechanism is partially connected to the power connection part and partially connected to 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.

8. The rotary force transmitter according to claim 1, characterized in that: The rotary force transmitter also includes a first clutch mechanism and a second clutch mechanism. The first clutch mechanism enables the power connection part to be connected to or disconnected from the screw transmission connection. The second clutch mechanism drives the screw to rotate when the machine tool spindle fixing part rotates. 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 connection or separation of the clutch member is controlled by powering on or off the magnetic seat.

9. The rotary force transmitter according to claim 8, characterized in that: The clutch member of 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.

10. The rotary force transmitter according to claim 8, characterized in that: The rotary force transmitter further includes a mounting plate, 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 connection or separation of the clutch member is controlled by energizing or de-energizing the magnetic seat, and the magnetic seats of the first clutch mechanism and the second clutch mechanism are respectively fixed on both sides of the mounting plate and do not move with the screw rod; When the clutch plate of the first clutch mechanism is separated, the clutch plate of the second clutch mechanism is connected; when the clutch of the first clutch mechanism is connected, the clutch plate of the second clutch mechanism is separated.

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