An electrically powered clamping device

Abstract

The application provides an electric clamping device, which comprises a motor assembly and a rotary force transmitter, the rotary force transmitter comprises a shell, a main shell and a screw rod transmission mechanism, the motor assembly drives the screw rod transmission mechanism to control the loosening or clamping of a workpiece by a clamp of a machine tool body, the shell is connected with the main shell through a bearing structure, one end of the main shell away from the motor assembly is used for being connected with a machine tool spindle, an anti-rotation mechanism is arranged on the periphery of the rotary force transmitter and is in contact with the shell to limit the rotation of the shell, and the flange of the main shell is aligned with the machine tool spindle, so that the electric clamping device can be connected with the machine tool, the structure is simple and convenient to install; meanwhile, the main shell and the shell are matched through the bearing structure, so that the coaxiality between the shell and the main shell is ensured.

Description

Technical Field

[0001] This invention relates to the field of machine tool clamping technology, and in particular to an electric clamping device. Background Technology

[0002] A clamp is a mechanical device used on a machine tool to clamp workpieces. The clamp has a through hole in the center to allow the workpiece or bar stock to pass through; the back has a cylindrical or short conical structure, which is directly or through a flange connected to the end of the machine tool spindle. Traditional clamping devices use a hydraulic station and a high-pressure cylinder to open and close. During production, the electric motor is used to compress the hydraulic oil to form high pressure, which then pushes the clamp to clamp the workpiece. This energy conversion process consumes a lot of energy, has high cost, and has a significant environmental impact if the hydraulic oil leaks. At the same time, the disassembly and assembly of traditional clamping devices from the machine tool body is complicated. Therefore, an electric clamping device that is directly mounted on the machine tool spindle has emerged.

[0003] The main housing of the electric clamping device is connected to the machine tool spindle, the lead screw transmission mechanism is connected to the machine tool drawbar, and the brake assembly controls the linkage between the motor and the lead screw transmission mechanism. Through the control of the brake assembly, the lead screw mechanism drives the machine tool drawbar to move, thereby controlling the opening and closing of the clamps, or the machine tool spindle drives the main housing to rotate.

[0004] Traditional electric clamping devices have their outer shell and main housing suspended in the air. The installation of the rotary power transmitter requires the main housing to be fixedly connected to the machine tool spindle via a flange, and the outer shell to be fixedly connected to the machine tool spindle box via a flange. The main housing is rotatable relative to the outer shell. This separate fixing of the main housing and outer shell results in a complex structure. When retrofitting old machine tools, additional mounting holes need to be drilled on the old machine tool body, and additional flange assemblies need to be installed, leading to high costs. It is necessary to consider the alignment of the mounting holes of the machine tool spindle box with the outer shell, and the mounting holes of the machine tool spindle with the main housing, while also considering the coaxiality of the outer and main housing after installation.

[0005] Meanwhile, when traditional electric clamping devices are used in machine tool bodies with belt drives, the motor and the machine tool spindle are connected by a belt, which is located at the end of the machine tool body closest to the electric clamping device. The outer shell and main housing of the traditional electric clamping device are both connected to the machine tool spindle, resulting in a large number of connection points between the electric clamping device and the machine tool. This can cause interference when assembling and disassembling the electric clamping device and the belt. When disassembling the belt, the electric clamping device must be disassembled first. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an electric clamping device that aligns the flange of the main housing with the machine tool spindle, thereby realizing the connection between the electric clamping device and the machine tool. The structure is simple and easy to install. At the same time, the main housing and the outer housing are matched through a bearing structure to ensure the coaxiality between the outer housing and the main housing.

[0007] To solve the above-mentioned technical problems, the technical solution used in this invention is as follows:

[0008] The electric clamping device of the present invention includes a motor assembly and a rotary power transmitter. The rotary power transmitter includes a housing, a main housing, and a lead screw transmission mechanism. The motor assembly drives the lead screw transmission mechanism to control the machine tool's clamps to loosen or clamp the workpiece. The housing and the main housing are connected by a bearing structure. The main housing is connected to the machine tool spindle for the installation of the entire rotary power transmitter.

[0009] Preferably, the bearing structure includes multiple bearings arranged axially along the main housing, with the bearings located at both ends of the main housing, and the bearings are used to achieve coaxial rotation between the main housing and the outer housing.

[0010] Preferably, the bearings are located at both ends of the lead screw drive mechanism.

[0011] Preferably, an anti-rotation mechanism is provided around the rotary power transmitter, and the anti-rotation mechanism contacts the outer casing to limit the rotation of the outer casing. The anti-rotation mechanism includes an anti-rotation rod, an anti-rotation caliper, and an anti-rotation mounting base; the anti-rotation mounting base is used to install the anti-rotation caliper, and the anti-rotation rod is connected to the outer casing and engaged in the anti-rotation caliper.

[0012] Preferably, the anti-rotation caliper is movably mounted on the anti-rotation mounting base, and the movable anti-rotation caliper is used to adjust the axial distance between the anti-rotation mounting base and the rotary transmission device.

[0013] Preferably, an adjustable-size fitting is provided at the end where the main housing connects to the machine tool spindle. The fitting is a mounting flange, which is detachably mounted on the main housing. Alternatively, a mounting flange is provided on the main housing, and the fitting is a detachable adapter flange mounted on the mounting flange.

[0014] Preferably, a sealing structure is provided at the connection between the outer shell and the main shell; the sealing structure includes a first sealing part provided on the outer shell and a second sealing part provided on the main shell, the first sealing part and the second sealing part being inserted into each other.

[0015] Preferably, it includes a connector, in which a buffer and a movable limiting plate are provided. The limiting plate abuts against the buffer and is linked with the movable end of the lead screw transmission mechanism to buffer the impact force acting on the workpiece.

[0016] Preferably, the rotary power transmitter further includes a brake assembly and a speed reducer component; the motor assembly and the brake assembly, the brake assembly and the speed reducer component, and the speed reducer component and the lead screw transmission mechanism are connected by a key connection structure.

[0017] Preferably, it is applied to the main body of a machine tool with a transmission belt drive, wherein the motor of the machine tool main body is connected to the machine tool spindle via a transmission belt.

[0018] Compared to existing technologies, the advantages of the electric clamping device described in this invention are mainly reflected in the following aspects: A bearing structure is provided to achieve a rotational connection between the main housing and the outer housing, while simultaneously supporting the outer housing; the main housing is connected to the machine tool spindle for the installation of the entire rotary transmission; when installing the rotary transmission, only the flange of the main housing needs to be aligned with the machine tool spindle to achieve the connection between the electric clamping device and the machine tool, resulting in a simple structure and easy installation; alignment only between the main housing and the machine tool spindle avoids the cumulative interference of errors from multiple reference installations, ensuring high precision and significantly reducing the difficulty of aligning the rotary transmission with the machine tool spindle; the main housing and the outer housing are fitted together through the bearing structure, ensuring the coaxiality between them. By setting bearings at both ends of the main housing to connect with the outer housing, stable support for the outer housing is achieved, further ensuring the coaxiality of the outer housing and the main housing, as well as the stability of the main housing when rotating relative to the outer housing.

[0019] Since the main housing rotates under the action of the machine tool spindle, an anti-rotation mechanism is set to limit the rotation of the housing, preventing the friction of the bearing structure from driving the housing to rotate, thus ensuring the stability of the housing.

[0020] In the anti-rotation mechanism, the anti-rotation rod is connected to the outer shell, and the anti-rotation caliper clamps the anti-rotation rod, restricting its movement and thus limiting the rotation of the outer shell. The structure is simple and has good stability. By adjusting the position of the anti-rotation caliper, the axial distance between the anti-rotation mounting base and the rotary actuator can be changed, making it easier to fix the anti-rotation mounting base to objects at different distances.

[0021] By setting a detachable mounting flange, the main housing can be matched with flanges of different sizes on the machine tool spindle by replacing the mounting flange, which has strong adaptability and versatility; by setting a detachable adapter flange on the mounting flange, different sizes of adapter flanges can be matched with flanges of different sizes on the machine tool spindle, which has a simple structure.

[0022] By setting up a sealing structure, dust and foreign objects are prevented from entering the inner wall of the rotary power transmitter, thus avoiding the influence of dust and foreign objects on the rotation of the main housing and ensuring the reliability of the rotation of the main housing. In the sealing structure, the first sealing part and the second sealing part are inserted and matched to form sealing interfaces in the axial and radial directions respectively, thereby improving the sealing effect and ensuring the tightness of the connection between the first sealing part and the second sealing part.

[0023] The lead screw drive mechanism drives the machine tool drawbar to move, and the movement of the machine tool drawbar controls the opening and closing of the fixture. When the fixture is pulled to move, a large impact force is generated instantaneously. By setting a connector, the impact force is buffered to prevent the workpiece from deforming under the large impact force.

[0024] In the connector, when the impact force is greater than the preload of the buffer, the buffer is compressed by the impact force and undergoes elastic deformation to buffer the impact force. While effectively ensuring the buffering of the impact force, it also ensures that the stroke of the tie rod remains unchanged, ensuring the clamping accuracy of the fixture and ensuring that the workpiece is subjected to stable and balanced force during the clamping process.

[0025] The motor assembly and brake assembly, the brake assembly and reducer components, and the reducer components and lead screw transmission mechanism are connected by a key connection structure; the structure is simple, reliable, and enables rapid assembly between components. Attached Figure Description

[0026] The above and other objects, features, and advantages of the invention will become clearer through a more detailed description of the preferred embodiments illustrated in the accompanying drawings. The same reference numerals denote the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of the invention.

[0027] Figure 1 This is a three-dimensional schematic diagram of Embodiment 1 of the present invention.

[0028] Figure 2 This is a cross-sectional view of Embodiment 1 of the present invention.

[0029] Figure 3 for Figure 2 A magnified view of A in the middle.

[0030] Figure 4 for Figure 3 A magnified view of B in the middle.

[0031] Figure 5 This is a cross-sectional view of the connection between the present invention and a machine tool in Embodiment 1.

[0032] Figure 6 This is an exploded view of the connector in this invention.

[0033] Figure 7 This is a schematic diagram of one installation of the connector in this invention.

[0034] Figure 8 This is another installation diagram of the connector in this invention.

[0035] Figure 9 This is a cross-sectional view of Embodiment 2 of the present invention.

[0036] Figure 10 This is a cross-sectional view of Embodiment 2 of the present invention with the hollow tube removed.

[0037] Figure 11 This is a schematic diagram showing the coordination of the motor assembly rotating shaft, brake assembly input shaft, reducer component transmission shaft, and lead screw transmission mechanism in Embodiment 2 of the present invention.

[0038] Explanation of icon numbers:

[0039] Motor assembly 1, motor assembly rotating shaft 10.

[0040] Rotary power transmitter 2, assembly 20, housing 21, mounting boss 210, main housing 22, brake assembly 23, brake assembly input shaft 230, reducer assembly 24, reducer assembly drive shaft 240, lead screw drive mechanism 25, lead screw 251, lead screw nut 252, tie rod connecting shaft 253, bearing 26, first sealing part 27, first sealing protrusion 271, first sealing groove 272, second sealing part 28, second sealing groove 281, second sealing protrusion 282, anti-collision structure 29.

[0041] Machine tool body 3, machine tool tie rod 31, machine tool spindle 32

[0042] Anti-rotation mechanism 4, anti-rotation rod 41, anti-rotation caliper 42, caliper groove 420, second anti-rotation mounting hole 421, anti-rotation mounting base 43, first anti-rotation mounting hole 431, nut 44, anti-rotation buffer block 45.

[0043] Connector 5, first connector 51, first connecting end 510, second connector 52, second connecting end 520, cavity 53, buffer 54, limiting plate 55.

[0044] Hollow tube 6. Detailed Implementation

[0045] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention. In this embodiment, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0046] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to and integrated with the other element, or there may be an intervening element present. The terms "mounted," "one end," "the other end," and similar expressions used in this invention are for illustrative purposes only.

[0047] Example 1.

[0048] like Figure 1-8As shown, an electric clamping device includes a motor assembly 1 and a rotary transmission device 2. The rotary transmission device 2 includes a housing 21, a main housing 22, a brake assembly 23, a reducer assembly 24, and a lead screw transmission mechanism 25. The housing 21 covers the outside of the main housing 22. The brake assembly 23, the reducer assembly 24, and the main housing 22 are distributed sequentially along the axial direction of the rotary transmission device 2. The lead screw transmission mechanism 25 passes through the main housing 22. The motor assembly 1 and the brake assembly 23 are fixed on the housing 21. The motor assembly 1 is connected to the brake assembly 23, the brake assembly 23 is connected to the reducer assembly 24, and the reducer assembly 24 is connected to the lead screw transmission mechanism 25. The brake assembly 23 is used to control the linkage between the motor assembly 1 and the reducer assembly 24. The reducer assembly 24 is used to amplify the output torque of the motor assembly 1 to provide the electric clamping device with greater kinetic energy output. The motor assembly 1 drives the lead screw transmission mechanism 25 to control the clamping of the machine tool body 3 to loosen or clamp the workpiece.

[0049] The lead screw transmission mechanism 25 includes a lead screw 251 and a lead screw nut 252. Specifically, the rotating shaft of the motor assembly 1 is connected to the input end of the input shaft of the brake assembly 23, the output end of the input shaft of the brake assembly 23 is connected to the transmission shaft of the reducer assembly 24, the reducer assembly 24 is connected to the lead screw 251, and the lead screw nut 252 is inserted in the lead screw 251. The rotating lead screw 251 drives the lead screw nut 252 to move in the axial direction. The lead screw nut 252 is connected to the pull rod connecting shaft 253, which is used to connect to the machine tool pull rod 31. The pull rod connecting shaft 253 moves with the lead screw nut 252. The end of the machine tool pull rod 31 away from the pull rod connecting shaft 253 is connected to a fixture. The brake assembly 23 is an electromagnetic brake assembly. The motor assembly 1, the brake assembly 23, and the reducer assembly 24 are existing technologies and will not be described in detail here.

[0050] The outer shell 21 is connected to the main shell 22 via a bearing structure. The main shell 22 is connected to the machine tool spindle 32 for the installation of the entire rotary power transmitter 2. The outer shell 21 is not directly connected to the machine tool 3. The end of the main shell 22 away from the motor assembly 1 is connected to the machine tool spindle 32. An anti-rotation mechanism 4 is provided on the periphery of the rotary power transmitter 2. The anti-rotation mechanism 4 contacts the outer shell 21 to limit the rotation of the outer shell 21.

[0051] A bearing structure is provided to achieve a rotatable connection between the main housing 22 and the outer housing 21, while also supporting the outer housing 21. When installing the rotary power transmitter 2, simply aligning the flange of the main housing 22 with the machine tool spindle 32 is sufficient to connect the electric clamping device to the machine tool body 3. The structure is simple and easy to install. Simultaneously, the bearing structure ensures the coaxiality between the main housing 22 and the outer housing 21. Since the main housing 22 rotates under the action of the machine tool spindle 32, an anti-rotation mechanism 4 is provided to restrict the rotation of the outer housing 21, preventing the frictional force of the bearing structure from driving the outer housing 21 to rotate, thus ensuring the stability of the outer housing 21.

[0052] The bearing structure includes a plurality of bearings 26 arranged axially along the main housing 22, with the bearings 26 located at both ends of the main housing 22. By connecting the bearings 26 to the outer shell 21 at both ends of the main housing 22, stable support for the outer shell 21 is achieved, further ensuring the coaxiality of the outer shell 21 and the main housing 22, as well as the stability of the main housing 22 when rotating relative to the outer shell 21.

[0053] The anti-rotation mechanism 4 includes an anti-rotation rod 41, an anti-rotation clamp 42, and an anti-rotation mounting base 43. The anti-rotation mounting base 43 is used to install the anti-rotation clamp 42, and the anti-rotation rod 41 is connected to the outer shell 21 and locked in the anti-rotation clamp 42. The anti-rotation rod 41 is connected to the outer shell 21, and the anti-rotation clamp 42 locks the anti-rotation rod 41, restricting the movement of the anti-rotation rod 41 and thus restricting the rotation of the outer shell 21. The structure is simple and has good stability.

[0054] In one embodiment, a mounting boss 210 is provided in the outer casing 21, and a threaded hole is provided in the mounting boss 210. The anti-rotation rod 41 is a threaded anti-rotation screw, which is threadedly engaged with the threaded hole of the mounting boss 210. A nut 44 is also provided on the anti-rotation rod 41, which engages with the threaded hole of the mounting boss 210 to tighten and prevent loosening. This method is simple to install and has good stability.

[0055] In one embodiment, the anti-rotation caliper 42 is provided with a slot 420, and the anti-rotation rod 41 is engaged in the slot 420. An anti-rotation buffer block 45 is provided at the connection between the anti-rotation rod 41 and the slot 420. The anti-rotation buffer block 45 is sleeved on the anti-rotation rod 41 and is angularly coupled to the slot 420. The anti-rotation buffer block 45 is made of a flexible material, such as rubber. When the outer shell 21 has rotational potential energy, the anti-rotation rod 41 and the anti-rotation caliper 42 cooperate to prevent the outer shell 21 from rotating. At the same time, the anti-rotation buffer block 45 can buffer and offset the impact force released by the rotational kinetic energy of the outer shell 21.

[0056] The anti-rotation caliper 42 is movably mounted on the anti-rotation mounting base 43. Moving the anti-rotation caliper 42 is used to adjust the axial distance between the anti-rotation mounting base 43 and the rotary force transmitter 2. By adjusting the position of the anti-rotation caliper 42, the axial distance between the anti-rotation mounting base 43 and the rotary force transmitter 2 is changed, making it easier to fix the anti-rotation mounting base 43 to objects at different distances.

[0057] In one embodiment, the anti-rotation mounting base 43 is provided with a plurality of first anti-rotation mounting holes 431, and the anti-rotation caliper 42 is provided with a plurality of second anti-rotation mounting holes 421; the first anti-rotation mounting holes 431 and the second anti-rotation mounting holes 421 are both distributed along the axial direction of the rotary transmission device 2; the anti-rotation caliper 42 is mounted on the anti-rotation mounting base 43 by means of bolts passing through the first anti-rotation mounting holes 431 and the second anti-rotation mounting holes 421 engaging with nuts; the position of the anti-rotation caliper 42 on the anti-rotation mounting base 43 is adjusted by means of the second anti-rotation mounting holes 421 engaging with the first anti-rotation mounting holes 431 at different positions.

[0058] An adjustable fitting 20 is provided at one end of the main housing 22 that connects to the machine tool spindle 32. The fitting 20 is used to mate with flanges of different sizes on the machine tool spindle 32.

[0059] In one embodiment, the assembly 20 is a mounting flange, which is detachably mounted on the main housing 22. By providing a detachable mounting flange, the main housing 22 can be matched with flanges of different sizes on the machine tool spindle 32 by replacing the mounting flange, thus achieving strong adaptability and versatility.

[0060] In another embodiment, a mounting flange is provided on the main housing 22, and the assembly 20 is a detachable adapter flange (not shown in the figure) provided on the mounting flange; by providing a detachable adapter flange on the mounting flange, different sizes of adapter flanges can be used to cooperate with flanges of different sizes on the machine tool spindle 32, resulting in a simple structure.

[0061] A sealing structure is provided at the connection between the outer shell 21 and the main shell 22. This sealing structure prevents dust and foreign objects from entering the inner wall of the rotary power transmitter 2, thus avoiding interference with the rotation of the main shell 22 and ensuring the reliability of its rotation. The sealing structure includes a first sealing part 27 on the outer shell 21 and a second sealing part 28 on the main shell 22, which are interlocked. This interlocking of the first sealing part 27 and the second sealing part 28 forms sealing interfaces along both the axial and radial directions, improving the sealing effect and ensuring a tight connection between them.

[0062] In one embodiment, the first sealing part 27 and the second sealing part 28 are interlocked, forming a hierarchical sealing interface between the first sealing part 27 and the second sealing part 28; by forming a hierarchical sealing interface, the blocking effect on dust and foreign objects is improved.

[0063] The first sealing part 27 includes two first sealing protrusions 271 protruding from the outer shell 21, and a first sealing groove 272 is formed between the two first sealing protrusions 271; the second sealing part 28 includes two second sealing grooves 281 recessed from the main shell 22, and a second sealing protrusion 282 is provided between the two second sealing grooves 281; the first sealing protrusions 271 are inserted into the second sealing grooves 281, and the second sealing protrusions 282 are inserted into the first sealing grooves 272.

[0064] The rotary force transmitter 2 also includes a connector 5, which is linked with the lead screw transmission mechanism 25 to buffer the impact force acting on the workpiece. Specifically, the connector 5 is used to buffer the impact force acting on the workpiece by the lead screw transmission mechanism 25. Since the lead screw transmission mechanism 25 drives the machine tool drawbar 31 to move, and the movement of the machine tool drawbar 31 controls the opening and closing of the fixture, a large impact force will be generated instantaneously when the fixture is pulled to move. By setting the connector 5 to buffer the impact force, the workpiece is prevented from deforming under the large impact force.

[0065] The connector 5 includes a buffer 54 and a movable limiting plate 55. The limiting plate 55 abuts against the buffer 54 and is linked to the movable end of the lead screw transmission mechanism 25. When the impact force is greater than the preload of the buffer 54, the buffer 54 is compressed by the impact force and undergoes elastic deformation to buffer the impact force. This effectively ensures the buffering of the impact force while also keeping the stroke of the pull rod constant, ensuring the clamping accuracy of the fixture and ensuring that the workpiece is subjected to stable and balanced force during the clamping process.

[0066] The connector 5 includes an axially distributed first connector 51 and a second connector 52. A cavity 53 is provided in the second connector 52, and a buffer 54 and a limiting plate 55 are disposed in the cavity 53. The buffer 54 is a spring. The end of the first connector 51 away from the second connecting end 520 is provided with a first connecting end 510, and the end of the second connector 52 away from the first connector 51 is provided with a second connecting end 520.

[0067] The first connecting piece 51 is connected to the movable end of the lead screw transmission mechanism 25, and the limiting plate 55 is linked with the first connecting piece 51. The first connecting piece 51 and the second connecting piece 52 are configured to be directly connected or indirectly connected, which can be adjusted according to different usage scenarios, and has a wide range of applications.

[0068] In one embodiment, the first connecting member 51 and the second connecting member 52 are located between the movable end of the lead screw transmission mechanism 25 and the machine tool tie rod 31. A connecting member is provided in the second connecting member 52. The connecting member extends out of the second connecting member 52 and abuts against the side of the limiting plate 55 away from the buffer member 54. The tie rod connecting shaft 253 of the lead screw transmission mechanism 25, the first connecting member 51 and the connecting member are connected in sequence. The second connecting end 520 of the second connecting member 52 is connected to the machine tool tie rod 31.

[0069] The first connecting end 510 can be inserted into the pull rod connecting shaft 253, and the first connecting end 510 is interference-fitted with the pull rod connecting shaft 253 or is engaged with it by a pin; the first connecting end 510 can also be threaded into the pull rod connecting shaft 253; the machine tool pull rod 31 can be inserted into the second connecting end 520, and the second connecting end 520 is interference-fitted with the machine tool pull rod 31 or is engaged with it by a pin; the second connecting end 520 can also be threaded into the machine tool pull rod 31.

[0070] Preferably, the first connecting end 510 is threadedly engaged with the pull rod connecting shaft 253, and the second connecting end 520 is threadedly engaged with the machine tool pull rod 31.

[0071] In another embodiment, the first connecting member 51 and the second connecting member 52 are separately arranged. The first connecting member 51 is located between the movable end of the lead screw transmission mechanism 25 and the machine tool tie rod 31, and the second connecting member 52 is located at the end of the machine tool tie rod 31 away from the lead screw transmission mechanism 25. The first connecting member 51 connects the movable end of the lead screw transmission mechanism 25 and the machine tool tie rod 31, and the first connecting end 510 cooperates with the tie rod connecting shaft 253. The second connecting member 52 is provided with a connecting member, which extends out of the second connecting member 52 and abuts against the side of the limiting plate 55 away from the buffer member 54. The connecting member is connected to the end of the machine tool tie rod 31 away from the lead screw transmission mechanism 25, and the second connecting end 520 of the second connecting member 52 is used to connect with the workpiece.

[0072] Reference Figure 4 As shown, an anti-collision structure 29 is provided on the inner side of the main housing 22 near the machine tool spindle 32. The anti-collision structure 29 is used to abut against the lead screw nut 252 to limit the stroke of the lead screw nut 252, prevent the lead screw nut 252 from overtraveling and dislodging, and protect the stroke of the tie rod connecting shaft 253 and the machine tool tie rod 31. In one embodiment, the anti-collision structure 29 is a flexible anti-collision block, which buffers the impact force on the lead screw nut 252 and prevents the lead screw nut 252 from being damaged under the impact force. The flexible anti-collision block is preferred.

[0073] Preferably, the electric clamping device is applied to the machine tool body with a drive belt, and the motor of the machine tool body is connected to the machine tool spindle via a drive belt. The drive belt is located at the end of the machine tool body near the electric clamping device. This electric clamping device is only connected to the machine tool spindle through the main housing to complete the assembly of the electric clamping device and the machine tool. This reduces the number of connection points between the electric clamping device and the machine tool, avoids interference when assembling and disassembling the electric clamping device and the drive belt, and facilitates the disassembly and assembly of the drive belt.

[0074] Example 2.

[0075] like Figure 9-11 As shown, an electric clamping device is provided, wherein the motor assembly 1 and the brake assembly 23, the brake assembly 23 and the reducer assembly 24, and the reducer assembly 24 and the lead screw transmission mechanism 25 are connected by key connection structures; the key connection structure can be a spline, a flat key, or other key connection structure.

[0076] In this embodiment, the motor assembly rotating shaft 10 is connected to the input end of the brake assembly input shaft 230 via a spline; the output end of the brake assembly input shaft 230 is connected to the reducer component transmission shaft 240 via a spline; the reducer component transmission shaft 240 is connected to the lead screw 251 via a flat key; the structure is simple and reliable; and it can realize rapid assembly between components.

[0077] Preferably, the motor assembly rotating shaft 10, the brake assembly input shaft 230, the reducer component transmission shaft, and the lead screw 251 are hollow; a hollow tube 6 passes through the hollow motor assembly rotating shaft 10, brake assembly input shaft 230, reducer component transmission shaft 240, and lead screw 251, and the hollow tube 6 is connected to the pull rod connecting shaft 253. Other structures are the same as in Embodiment 1.

[0078] The hollow motor assembly 1, brake assembly 23, reducer component 24 and screw transmission mechanism 25 work together to form a hollow channel inside the electric clamping device, and a hollow pipe can be installed in the hollow channel; water, air, material flow and material ejection can be realized through the hollow pipe.

[0079] Example 3

[0080] A machine tool includes a machine tool body 3 and an electric clamping device. The machine tool body 3 includes a machine tool tie rod 31 and a machine tool spindle 32. The main housing of the electric clamping device is connected to the machine tool spindle for the installation of the entire rotary power transmission device. The electric clamping device can be one of the embodiments one or two.

[0081] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0082] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An electric clamping device, comprising a motor assembly and a rotary transmission device, the rotary transmission device comprising a housing, a main housing, a lead screw transmission mechanism, and a connector, wherein the housing is disposed outside the main housing, the motor assembly is fixed to the housing, the lead screw transmission mechanism is disposed within the main housing, the motor assembly drives the lead screw transmission mechanism to control the clamping of the machine tool body to loosen or clamp the workpiece, characterized in that: The outer shell is connected to the main shell via a bearing structure. The main shell is connected to the machine tool spindle, while the outer shell is not directly connected to the machine tool. The bearing structure includes multiple bearings arranged axially along the main housing, with the bearings located at both ends of the main housing. The bearings are used to achieve coaxial rotation between the main housing and the outer housing; the bearings are located at both ends of the lead screw drive mechanism. An anti-rotation mechanism is provided around the rotary power transmitter. The anti-rotation mechanism contacts the outer shell to limit the rotation of the outer shell. The anti-rotation mechanism includes an anti-rotation rod, an anti-rotation caliper, and an anti-rotation mounting base. The anti-rotation mounting base is used to install the anti-rotation caliper. The anti-rotation rod is connected to the outer shell and is locked in the anti-rotation caliper. The anti-rotation caliper is movably set on the anti-rotation mounting base. Moving the anti-rotation caliper is used to adjust the axial distance between the anti-rotation mounting base and the rotary power transmitter. The connector is equipped with a buffer and a movable limiting plate. The limiting plate abuts against the buffer and is linked with the movable end of the lead screw transmission mechanism to buffer the impact force acting on the workpiece.

2. The electric clamping device according to claim 1, characterized in that: An adjustable-size fitting is provided at one end of the main housing connected to the machine tool spindle. The fitting is a mounting flange, which is detachably mounted on the main housing; or, a mounting flange is provided on the main housing, and the fitting is a detachable adapter flange mounted on the mounting flange.

3. The electric clamping device according to claim 1, characterized in that: A sealing structure is provided at the connection between the outer shell and the main shell; the sealing structure includes a first sealing part provided on the outer shell and a second sealing part provided on the main shell, the first sealing part and the second sealing part being inserted into each other.

4. The electric clamping device according to claim 1, characterized in that: The rotary power transmission device also includes a brake assembly and a speed reducer component; the motor assembly and the brake assembly, the brake assembly and the speed reducer component, and the speed reducer component and the lead screw transmission mechanism are connected by a key connection structure.

5. The electric clamping device according to claim 1, characterized in that: It is used in machine tool bodies with belt drives, where the motor of the machine tool body is connected to the machine tool spindle via a belt.

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