A fast constant force clamping rotary fixture system

Abstract

The present invention discloses a fast constant-force clamping rotary fixture system, comprising a numerical control drive control unit, a motor, a flange, a rotary spindle, an eccentric structure disk, a housing, a clamping module unit, a pressure spring, and a one-way stop module; the motor is mounted on the flange, the rotary spindle is fixedly connected to the output shaft of the motor, the eccentric structure disk is sleeved and rotated outside the rotary spindle and is coaxially arranged with the rotary spindle, and the housing is coaxially fixedly connected to the rotary spindle; the inner ring of the eccentric structure disk is evenly provided with at least three eccentric arc surfaces, the outer ring of the eccentric structure disk is provided with a constant-force spring, and the ends of the constant-force spring are respectively fixed to the eccentric structure disk and the housing; the housing is evenly provided with the same number of clamping module units as the eccentric arc surfaces along the circumference; the clamping module unit comprises a slider group, a follower, and a clamping claw; and the one-way stop module can unidirectionally stop the rotation of the eccentric structure disk. The present invention is convenient and fast to operate, has low manufacturing cost, and has an adjustable and controllable clamping force, and is applicable to a wide range of parts clamping.

Description

Technical Field

[0001] The present invention relates to the technical field of automated mechanical equipment, and in particular to a fast constant-force clamping rotary fixture system. Background Art

[0002] The field of modern mechanical processing involves a wide range of categories, among which the traditional solutions for rotary shaft and disc parts are mostly clamped by mechanical means such as chucks, collets, cylinders, hydraulic cylinders, electric cylinders, electromagnetic chucks, or vacuum chucks. Figure 1 and Figure 2 As shown, whether it's a pneumatic chuck, hydraulic chuck, collet, air cylinder, or hydraulic cylinder, all are powered by a hydraulic workstation or air pump workstation to meet the thrust and pull forces required for clamping. The output pressure of the air pump workstation and hydraulic workstation can reach 0.6 to 1.2 MPa, and the control valve can be manually controlled or numerically controlled electrically. The machine tool's rotary axis system is equipped with clamping actuators such as pneumatic chucks, hydraulic chucks, hydraulic collets, pneumatic collets, or air and oil cylinders. These clamping actuators can clamp or release the clamped parts. The rotary motion of the machine tool's rotary axis system is driven by a high-power motor connected to the transmission system, driving the axis system, clamping actuator, and clamped parts to rotate forward and backward, and stop.

[0003] Traditional mechanical chucks clamp parts using hydraulic or pneumatic sources as the power source for the clamping action. However, they have the disadvantage of being difficult to control the clamping force of the clamped parts. Especially when clamping thin-walled parts, excessive clamping force can easily cause deformation of the clamped parts or quality defects such as clamping marks remaining on the surface of the parts after clamping.

[0004] Traditional hydraulic or pneumatic chuck clamping solutions use a hydraulic workstation or air pump workstation as the clamping power source to implement the clamping action of the actuator. The rotation of the clamped parts is driven by a motor-driven transmission system, rotary shaft system, and clamping actuator to start and stop the rotation. This clamping and rotation system and control system have a complex structure and high cost.

[0005] like Figure 3 As shown in the figure, the traditional electric chuck clamps parts by connecting the clamping motor and the reduction mechanism to the electric chuck, and the controller controls the clamping motor to realize the clamping and releasing action of the electric chuck. The rotary motion is that the machine tool power motor is connected to the machine tool rotary shaft system through the transmission system to drive the electric chuck and the clamped part to rotate together.

[0006] The principle of traditional electric chucks for clamping parts is usually to reduce the speed of the clamping motor through a reduction mechanism to increase the transmission torque, thereby increasing the clamping force to meet the requirements of heavy cutting. However, the clamping of thin-walled parts requires an electric chuck with a clamping force measurement function to adjust the output torque of the clamping motor to prevent the defect of clamping deformation. However, the cost of this type of electric chuck is generally high.

[0007] Traditional electromagnetic clamping methods have difficulty clamping non-magnetic parts, while pneumatic vacuum suction cups have high requirements for the flatness of the part adsorption surface. Some irregular shapes are difficult to adsorb and pick up. These two methods have great limitations. Summary of the Invention

[0008] The purpose of the present invention is to provide a fast constant force clamping rotary clamp system to solve the problems existing in the above-mentioned prior art. It has a simple structure, convenient and quick operation, low production cost, adjustable and controllable clamping force, wide applicability for part clamping, and low limitations.

[0009] To achieve the above object, the present invention provides the following solutions:

[0010] The present invention provides a fast constant force clamping rotary fixture system, comprising a numerical control drive control unit, a motor, a flange, a rotary spindle, an eccentric structure disk, a housing, a clamping module unit, a pressure spring and a one-way stop module;

[0011] The motor is mounted on the flange, the rotary spindle is rotatably connected within the flange and fixedly connected to the output shaft of the motor, the CNC drive control unit is used to control the operation of the motor, the eccentric structure disk is sleeved and rotated outside the rotary spindle and the rotary spindle is coaxially arranged, the outer shell is covered on the eccentric structure disk and fixedly connected coaxially with the rotary spindle;

[0012] The inner ring of the eccentric structure disk is evenly provided with at least three eccentric arc surfaces, the axes of the eccentric arc surfaces deviate from the axis of the eccentric structure disk, and the outer ring of the eccentric structure disk is provided with a constant force spring, one end of the constant force spring is fixed to the eccentric structure disk, and the other end is fixed to the outer shell;

[0013] The outer shell is evenly provided with a plurality of clamping module units which respectively cooperate with each of the eccentric arc surfaces along the circumference; the clamping module unit includes a slider group, a follower and a clamping claw, the slider group is radially slidably arranged on the outer shell, the central axis of the follower is fixedly connected to the slider group, the rolling ring of the follower is rollingly matched with the eccentric arc surface, the clamping claw is fixedly connected to the slider group, and the middle position of the three clamping claws is used to place the clamped parts; a spring fixing core is fixedly provided in the middle of the outer shell, and a pressure spring is provided between one end of the slider group close to the axis and the spring fixing core, and the pressure spring provides elastic force to drive the slider group to slide radially outward so that the rolling ring of the follower is always in close contact with the eccentric arc surface;

[0014] The one-way stop module is mounted on the flange and located outside the eccentric structure disk, and the one-way stop module can perform one-way stop on the rotation of the eccentric structure disk;

[0015] When the motor rotates clockwise, the follower retracts along the eccentric arc surface, the clamping claw clamps the clamped part, the constant force spring is in a first tension state, providing a constant torque to clamp the clamped part, and the eccentric structural disk rotates with the motor; when the motor rotates counterclockwise to a stop, the eccentric structural disk stops under the action of the one-way stop module, the follower expands along the eccentric arc surface, the clamping claw relaxes the clamped part, and the constant force spring is stretched from the first tension state to the second tension state.

[0016] Preferably, the slider group includes a fixedly connected slider and a sealed slider, the slider is arranged in the shell, and the two sides of the slider are slidably connected to the shell through cross roller guides, and the center axis of the follower is fixedly connected to the slider; the sealed slider is arranged outside the shell, and a sliding boss is provided at one end of the sealed slider close to the shell, and a sliding hole is provided on the shell for the sliding boss to pass through to connect with the slider, the sliding boss slides radially in the sliding hole, and the clamp is fixedly connected to the sealing slider.

[0017] Preferably, an annular limiting step is provided on the outer periphery of the sliding hole, an annular limiting retaining ring is provided on the annular limiting step, an annular limiting retaining ring is provided on the sealing slider outside the sliding boss, an annular limiting groove corresponding to the annular limiting retaining ring is provided, the annular limiting retaining ring is inserted into the annular limiting groove and the two slide relative to each other in the radial direction, and the sliding stroke of the sealing slider is limited by the matching structure of the annular limiting retaining ring and the annular limiting groove.

[0018] Preferably, the clamping jaw and the sealing slider are fixedly connected by a first bolt and are positioned and connected therebetween by a positioning pin.

[0019] Preferably, the sealing slider is fixedly connected to the slider via a second bolt.

[0020] The cam is fixedly mounted on the flange of the cam and is located at the outer side of the eccentric structure disk, and the cam is provided with a wedge-shaped cavity on one side of the eccentric structure disk, and the cam is movably arranged in the wedge-shaped cavity, and the axis of the cam is parallel to the axis of the eccentric structure disk, and the cam cover is connected to the cam and limits the cam to the inside of the wedge-shaped cavity; when the motor rotates clockwise to drive the eccentric structure disk to rotate clockwise, the eccentric structure disk drives the cam to roll in the expanding direction of the wedge-shaped cavity, and the one-way stop module will not stop the rotation of the eccentric structure disk; when the motor rotates counterclockwise to drive the eccentric structure disk to rotate counterclockwise, the eccentric structure disk drives the cam to roll in the shrinking direction of the wedge-shaped cavity, and the friction resistance between the cam and the inner wall of the wedge-shaped cavity and the outer wall of the eccentric structure disk stops the rotation of the eccentric structure disk.

[0021] Preferably, an elastic jackscrew mechanism is connected to the wedge-shaped cavity, and the elastic jackscrew mechanism provides elastic force to drive the stop column to move toward the shrinking direction of the wedge-shaped cavity.

[0022] Preferably, both ends of the constant force spring are provided with a hanging hole, a tightening ring is passed through the hanging hole, a screw is passed through the tightening ring, and the two ends of the constant force spring are fixedly connected to the eccentric structural disk and the outer shell respectively through the screws.

[0023] Preferably, the two guide rails of the cross roller guide rail are V-shaped guide rails, one of the V-shaped guide rails is fixedly connected to the housing by bolts, and the other of the V-shaped guide rails is fixedly connected to the slider by bolts.

[0024] Preferably, a clearance adjustment component is connected to the shell on one side of the slider, and the slider and the cross roller guides on both sides thereof are tightened to the shell on the other side of the slider through the clearance adjustment component; the clearance adjustment component includes a movable ejector pin and a tightening screw, and the shell is provided with a ejector pin sliding hole and a tightening threaded hole which are coaxial and interconnected, the movable ejector pin is slidably arranged in the ejector pin sliding hole, and the tightening screw is threadedly connected to the tightening threaded hole, and the two ends of the movable ejector pin are respectively in contact with the cross roller guide on one side of the slider and the tightening screw, and the movable ejector pin is tightened by the tightening screw to tighten the slider and the cross roller guides on both sides thereof to the shell, so that the cross roller guides have zero clearance rolling fit.

[0025] Compared with the prior art, the present invention has achieved the following technical effects:

[0026] The present invention provides a fast constant-force clamping rotary clamp system, which adopts an eccentric arc surface to control the stroke range of the clamping jaws, and the rotation action, clamping and releasing the parts are driven by the same motor, and a constant-force spring is used to control the clamping force, which has obvious effects on some parts that are easy to deform when clamped. The system has a simple structure, is easy and quick to operate, and has a low production cost. When the outer diameter of the clamped part changes, the constant-force spring tension can be adjusted according to the process requirements or constant-force springs with different tensions can be replaced to achieve the clamping force required by the process, meeting the needs of different holding forces. The clamping force is adjustable and controllable. Compared with the electromagnetic clamping part method and the pneumatic vacuum suction cup part adsorption method, it is not limited by the magnetic conductivity and surface flatness of the parts. The clamping of parts has a wide range of applications and few limitations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a block diagram of the principle of using an air pump workstation to provide power for the clamping of rotating parts in the prior art;

[0029] Figure 2 This is a block diagram of the principle of using a hydraulic workstation to provide power for the clamping of rotating parts in the prior art;

[0030] Figure 3 This is a block diagram of the principle of using a clamping motor to provide power for clamping rotating parts in the prior art;

[0031] Figure 4 This is a principle block diagram of the fast constant force clamping rotary fixture system provided by the present invention;

[0032] Figure 5 A schematic diagram of the three-dimensional structure of the fast constant force clamping rotary fixture system provided by the present invention;

[0033] Figure 6 A half-section schematic diagram of the flange and structural components on the flange in the present invention;

[0034] Figure 7 It is a three-dimensional schematic diagram of the connection structure between the clamping module unit and the pressure spring in the present invention;

[0035] Figure 8 A top view of the connection structure between the clamping module unit and the pressure spring in the present invention;

[0036] Figure 9 for Figure 8Schematic diagram of the middle AA section;

[0037] Figure 10 Schematic diagram of the three-dimensional structure of the sealing slider in the present invention;

[0038] Figure 11 Schematic diagram of the three-dimensional structure of the housing in the present invention;

[0039] Figure 12 It is a three-dimensional schematic diagram of the connection structure between the housing and the annular limit retaining ring in the present invention;

[0040] Figure 13 A top view of the connection structure of the rotary spindle, eccentric structure disk, constant force spring, one-way stop module and flange in the present invention;

[0041] Figure 14 It is a bottom view of the connection structure between the clamping module unit and the housing in the present invention.

[0042] In the figure: 1-CNC drive control unit, 2-motor, 3-flange, 4-rotating spindle, 5-eccentric structure disk, 6-housing, 7-clamping module unit, 8-pressure spring, 9-eccentric arc surface, 10-constant force spring, 11-slider group, 12-follower, 13-clamping claw, 14-center axis, 15-rolling ring, 16-clamped part, 17-spring fixing core, 18-limiting pin, 19-slider, 20-sealed slider, 21-cross roller guide, 22-sliding boss, 23-sliding hole, 24-annular limiting step, 25-annular Limiting ring, 26-annular limiting groove, 27-first bolt, 28-locating pin, 29-second bolt, 30-one-way stop module, 31-stop block, 32-stop block cover, 33-stop column, 34-wedge-shaped cavity, 35-elastic top screw mechanism, 36-tensioning ring, 37-screw, 38-V-shaped guide rail, 39-clearance adjustment assembly, 40-movable top pin, 41-tightening screw, 42-support positioning piece, 43-pressure plate, 44-fixing screw, 45-first precision slewing bearing, 46-second precision slewing bearing, 47-bearing pressure cover. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] The purpose of the present invention is to provide a fast constant force clamping rotary clamp system to solve the problems existing in the prior art. It has a simple structure, is easy and quick to operate, has a low production cost, and has adjustable and controllable clamping force. It has a wide range of applicability for parts clamping and few limitations.

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] like Figure 4-Figure 14 As shown, this embodiment provides a fast constant force clamping rotary fixture system, including a CNC drive control unit 1, a motor 2, a flange 3, a rotary spindle 4, an eccentric structure disk 5, a housing 6, a clamping module unit 7, a pressure spring 8 and a one-way stop module 30;

[0047] The motor 2 is mounted on the flange 3, the rotary spindle 4 is rotatably connected within the flange 3 and fixedly connected to the output shaft of the motor 2, the CNC drive control unit 1 is used to control the operation of the motor 2, the eccentric structure disk 5 is sleeved and rotated outside the rotary spindle 4 and is coaxially arranged with the rotary spindle 4, and the housing 6 is covered on the eccentric structure disk 5 and fixedly connected coaxially with the rotary spindle 4;

[0048] The inner ring of the eccentric structure disk 5 is evenly provided with at least three eccentric arc surfaces 9, the axis of the eccentric arc surface 9 deviates from the axis of the eccentric structure disk 5, and the outer ring of the eccentric structure disk 5 is provided with a constant force spring 10, one end of the constant force spring 10 is fixed on the eccentric structure disk 5, and the other end is fixed on the housing 6;

[0049] The outer shell 6 is evenly provided with a plurality of clamping module units 7 along the circumference, which are respectively matched with each eccentric arc surface 9; the number of eccentric arc surfaces 9 and clamping module units 7 is equal and they are matched one by one. In this embodiment, the eccentric arc surfaces 9 and the clamping module units 7 are both set to three, and the clamping module unit 7 includes a slider group 11, a follower 12 and a clamping claw 13. The slider group 11 is radially slidably arranged on the outer shell 6, and the central axis 14 of the follower 12 is fixedly connected to the slider group 11. The rolling ring 15 of the follower 12 is rolling matched with the eccentric arc surface 9, and the clamping claw 13 is fixedly connected. Connected to the slider assembly 11, the middle position of the three clamping jaws 13 is used to place the clamped part 16; the middle position of the three clamping jaws 13 corresponds to the housing 6 connected to a support positioning member 42, which is used to position the axial clamping length of the clamped part 16; a spring fixing core 17 is fixed to the middle of the housing 6, and a pressure spring 8 is installed between the end of the slider assembly 11 closest to the axis and the spring fixing core 17. The pressure spring 8 provides the elastic force that drives the slider assembly 11 to slide radially outward so that the roller ring 15 of the follower 12 always closely contacts the eccentric arc surface 9.

[0050] The one-way stop module 30 is installed on the flange 3 and is located outside the eccentric structure disk 5. The one-way stop module 30 can stop the rotation of the eccentric structure disk 5 in one direction;

[0051] When the motor 2 rotates clockwise, the follower 12 retracts along the eccentric arc surface 9, the clamping jaws 13 clamp the clamped part 16, and the constant force spring 10 is in the first tension state, providing a constant torque to clamp the clamped part 16, and the eccentric structural disk 5 rotates with the motor 2. When the motor 2 rotates counterclockwise to a stop, the eccentric structural disk 5 is stopped by the one-way stop module 30, the follower 12 extends along the eccentric arc surface 9, the clamping jaws 13 release the clamped part 16, and the constant force spring 10 is stretched from the first tension state to the second tension state. When the motor 2 rotates clockwise to a stop, the housing 6 and the eccentric structural disk 5 stop rotating, the relative position of the follower 12 and the eccentric arc surface 9 remains unchanged, the constant force spring 10 remains in the first tension state, the constant torque to clamp the clamped part 16 remains unchanged, and the clamping force on the clamped part 16 remains constant.

[0052] The output shaft of the motor 2 is connected to the rotating spindle 4 via a key, and a pressure plate 43 is provided on the end face of the rotating spindle 4. The pressure plate 43 is fastened to the output shaft of the motor 2 via a set screw 44. A first precision slewing bearing 45 is provided between the rotating spindle 4 and the flange 3, and a second precision slewing bearing 46 is provided between the rotating spindle 4 and the eccentric structure disk 5 to ensure the rotational stability of the rotating spindle 4. The first precision slewing bearing 45 is pressed against the flange 3 via the shaft shoulder of the rotating spindle 4, and the second precision slewing bearing 46 is pressed against the eccentric structure disk 5 via a bearing cover 47.

[0053] In this embodiment, the slider assembly 11 includes a fixedly connected slider 19 and a sealed slider 20. The slider 19 is disposed within the housing 6, with both sides of the slider 19 slidingly connected to the housing 6 via cross-roller guides 21. The central axis 14 of the follower 12 is fixedly connected to the slider 19. The sealed slider 20 is disposed outside the housing 6. A sliding boss 22 is provided on the end of the sealed slider 20 closest to the housing 6. The housing 6 is provided with a sliding hole 23 through which the sliding boss 22 passes to connect with the slider 19. The sliding boss 22 slides radially within the sliding hole 23. The clamping jaw 13 is fixedly connected to the sealed slider 20. The sliding connection of the slider 19 to the housing 6 via the cross-roller guides 21 ensures the stability of the slider 19 connection.

[0054] In this embodiment, an annular limiting step 24 is provided on the outer periphery of the sliding hole 23, and an annular limiting retaining ring 25 is provided on the annular limiting step 24. An annular limiting groove 26 corresponding to the annular limiting retaining ring 25 is provided on the sealing slider 20 outside the sliding boss 22. The annular limiting retaining ring 25 is inserted into the annular limiting groove 26 and the two slide relative to each other in the radial direction. The sliding stroke of the sealing slider 20 is limited by the matching structure of the annular limiting retaining ring 25 and the annular limiting groove 26. At the same time, the matching relationship between the annular limiting retaining ring 25 and the annular limiting groove 26 also plays a dust-proof role, which can prevent external dust from entering the outer shell 6 from the sliding hole 23.

[0055] In this embodiment, the clamping jaw 13 and the sealing slider 20 are fixedly connected by a first bolt 27 and are positioned and connected therebetween by a positioning pin 28 to ensure the connection stability between the clamping jaw 13 and the sealing slider 20 .

[0056] In this embodiment, the sealing slider 20 is fixedly connected to the slider 19 by a second bolt 29 , and the connection is convenient and firm.

[0057] In this embodiment, the one-way stop module 30 includes a stop block 31, a stop block cover 32 and a stop column 33. The stop block 31 is fixedly connected to the flange 3 and is located on the outside of the eccentric structural disk 5. The stop block 31 is provided with a wedge-shaped cavity 34 on the side facing the eccentric structural disk 5. The stop column 33 is movably arranged in the wedge-shaped cavity 34. The axis of the stop column 33 is parallel to the axis of the eccentric structural disk 5. The stop block cover 32 is connected to the stop block 31 and limits the stop column 33 to the wedge-shaped cavity 34; the motor 2 rotates clockwise to drive the eccentric structural disk 5 to rotate clockwise. When the motor 2 rotates counterclockwise to drive the eccentric structural disk 5 to rotate counterclockwise, the eccentric structural disk 5 drives the stop post 33 to roll in the direction of the wedge-shaped cavity 34 shrinking, and the friction between the stop post 33 and the inner wall of the wedge-shaped cavity 34 and the outer wall of the eccentric structural disk 5 increases rapidly, thereby stopping the rotation of the eccentric structural disk 5.

[0058] In this embodiment, an elastic jackscrew mechanism 35 is connected to the wedge-shaped cavity 34. The elastic jackscrew mechanism 35 provides the elastic force that drives the stop post 33 toward the narrowing direction of the wedge-shaped cavity 34. The elastic jackscrew mechanism 35 contacts the stop post 33 via a steel ball at its top, which is movably connected to the slot of the jackscrew via a spring.

[0059] In this embodiment, a hanging hole is provided at both ends of the constant force spring 10, a tensioning ring 36 is passed through the hanging hole, and a screw 37 is passed through the tensioning ring 36. The two ends of the constant force spring 10 are fixedly connected to the eccentric structural disk 5 and the outer shell 6 respectively through the screw 37.

[0060] In this embodiment, the two guide rails of the cross roller guide rail 21 are V-shaped guide rails 38, one V-shaped guide rail 38 is fixedly connected to the outer shell 6 by bolts, and the other V-shaped guide rail 38 is fixedly connected to the slider 19 by bolts. The V-shaped guide rail 38 refers to the contact surface of the guide rail with the cross roller being V-shaped. Its structure belongs to conventional technology and will not be repeated here.

[0061] In this embodiment, a clearance adjustment component 39 is connected to the outer shell on one side of the slider 19, and the clearance adjustment component 39 is used to tighten the slider 19 and the cross roller guides 21 on both sides thereof to the outer shell 6 on the other side of the slider 19; the clearance adjustment component 39 includes a movable ejector pin 40 and a tightening screw 41, and the outer shell 6 is provided with a ejector pin sliding hole and a tightening threaded hole which are coaxial and interconnected, the movable ejector pin 40 is slidably set in the ejector pin sliding hole, and the tightening screw 41 is threadedly connected to the tightening threaded hole, and the two ends of the movable ejector pin 40 are respectively in contact with the cross roller guide 21 on one side of the slider 19 and the tightening screw 41, and the movable ejector pin 40 is tightened by the tightening screw 41 to tighten the slider 19 and the cross roller guides 21 on both sides thereof to the outer shell 6, so that the cross roller guides 21 roll with zero clearance, so that the running clearance of the cross roller guides 21 is uniform, and the operation process is smoother.

[0062] When the CNC drive control unit 1 issues a forward rotation command, the motor 2 rotates clockwise (forward rotation), and the follower 12 retracts along the eccentric arc surface 9, causing the clamping claw 13 on the clamping module unit 7 to clamp the clamped part 16 and rotate. The constant force spring 10 is in the first tension state, providing a constant torque for clamping the clamped part 16, ensuring that the force for clamping the clamped part 16 is constant; when the CNC drive control unit 1 issues a stop command, the motor 2 stops rotating, and the one-way stop module 30 stops quickly. The rapid stop refers to overcoming the rotational inertia of the motor 2 through the friction between the stop column 33 and the inner wall of the wedge-shaped cavity 34 and the outer wall of the eccentric structure disk 5, thereby shortening the stopping time. At this time, the relative position of the follower 12 and the eccentric arc surface 9 remains unchanged, the constant force spring 10 is still in the first tension state, the constant torque for clamping the clamped part 16 remains unchanged, and the clamping force on the clamped part 16 remains constant.

[0063] When the CNC drive control unit 1 issues a reversal command, the motor 2 rotates counterclockwise (reverses), the one-way stop module 30 is activated, the eccentric structural disk 5 is stopped, and the follower 12 is stretched outward along the eccentric arc surface 9, so that the clamping jaws 13 on the clamping module unit 7 are opened. When the follower 12 is stretched outward along the eccentric arc surface 9 until the slider 19 contacts the limit pin 18 on the eccentric structural disk 5, the limit pin 18 prevents the follower 12 from continuing to stretch outward, so that the torque of the motor 2 increases. When the torque of the motor 2 reaches the set value, the motor 2 stops rotating. At this time, the constant force spring 10 will be stretched to the second stretching state, the clamping jaw 13 relaxes the clamped part 16, and the clamped part 16 can be freely taken out.

[0064] In this invention, the outer diameter of the clamped part is fixed, and the travel of the constant-force spring to tighten the slider and release the slider is fixed. Regardless of the possibility of permanent failure of the constant-force spring, the torque required to clamp the part is constant. If the outer diameter of the clamped part changes, the constant-force spring tension can be adjusted or replaced with a different constant-force spring to achieve the required clamping force, thus meeting the needs of the production process.

[0065] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A fast constant force clamping rotary fixture system, characterized by: It includes a CNC drive control unit, a motor, a flange, a rotary spindle, an eccentric structure disk, a housing, a clamping module unit, a pressure spring and a one-way stop module; The motor is mounted on the flange, the rotary spindle is rotatably connected within the flange and fixedly connected to the output shaft of the motor, the CNC drive control unit is used to control the operation of the motor, the eccentric structure disk rotates outside the rotary spindle and is coaxially arranged with the rotary spindle, and the outer shell is provided on the eccentric structure disk and fixedly connected coaxially with the rotary spindle; The inner ring of the eccentric structure disk is evenly provided with at least three eccentric arc surfaces, the axes of the eccentric arc surfaces deviate from the axis of the eccentric structure disk, and the outer ring of the eccentric structure disk is provided with a constant force spring, one end of the constant force spring is fixed to the eccentric structure disk, and the other end is fixed to the outer shell; The outer shell is evenly provided with a plurality of clamping module units which respectively cooperate with each of the eccentric arc surfaces along the circumference; the clamping module unit includes a slider group, a follower and a clamping claw, the slider group is radially slidably arranged on the outer shell, the central axis of the follower is fixedly connected to the slider group, the rolling ring of the follower is rollingly matched with the eccentric arc surface, the clamping claw is fixedly connected to the slider group, and the middle position of the three clamping claws is used to place the clamped parts; a spring fixing core is fixedly provided in the middle of the outer shell, and a pressure spring is provided between one end of the slider group close to the axis and the spring fixing core, and the pressure spring provides elastic force to drive the slider group to slide radially outward so that the rolling ring of the follower is always in close contact with the eccentric arc surface; The one-way stop module is mounted on the flange and located outside the eccentric structure disk, and the one-way stop module can perform one-way stop on the rotation of the eccentric structure disk; When the motor rotates clockwise, the follower retracts along the eccentric arc surface, the clamping claw clamps the clamped part, the constant force spring is in a first tension state, providing a constant torque to clamp the clamped part, and the eccentric structural disk rotates with the motor; when the motor rotates counterclockwise to a stop, the eccentric structural disk stops under the action of the one-way stop module, the follower expands along the eccentric arc surface, the clamping claw relaxes the clamped part, and the constant force spring is stretched from the first tension state to the second tension state.

2. The rapid constant force clamping rotary fixture system according to claim 1, characterized in that: The slider group includes a fixedly connected slider and a sealed slider, the slider is arranged in the shell, and the two sides of the slider are slidably connected to the shell through cross roller guides, and the central axis of the follower is fixedly connected to the slider; the sealed slider is arranged outside the shell, and a sliding boss is provided at one end of the sealed slider close to the shell, and a sliding hole is provided on the shell for the sliding boss to pass through so as to be connected to the slider, the sliding boss slides radially in the sliding hole, and the clamp is fixedly connected to the sealing slider.

3. The rapid constant force clamping rotary fixture system according to claim 2, characterized in that: An annular limiting step is provided on the outer periphery of the sliding hole, an annular limiting retaining ring is provided on the annular limiting step, an annular limiting retaining ring is provided on the sealing slider outside the sliding boss, an annular limiting groove corresponding to the annular limiting retaining ring is provided, the annular limiting retaining ring is inserted into the annular limiting groove and the two slide relative to each other in the radial direction, and the sliding stroke of the sealing slider is limited by the matching structure of the annular limiting retaining ring and the annular limiting groove.

4. The rapid constant force clamping rotary fixture system according to claim 2, characterized in that: The clamping jaw and the sealing slider are fixedly connected by a first bolt and are positioned and connected therebetween by a positioning pin.

5. The rapid constant force clamping rotary fixture system according to claim 2, characterized in that: The sealing slider is fixedly connected to the slider via a second bolt.

6. The rapid constant force clamping rotary fixture system according to claim 1, characterized in that: The one-way stop module comprises a stop block, a stop block cover and a stop post, the stop block is fixedly connected to the flange plate and is located at the outer side of the eccentric structure disk, and the stop block is provided with a wedge-shaped cavity on one side of the eccentric structure disk, and the stop post is movably arranged in the wedge cavity, the axis of the stop post is parallel to the axis of the eccentric structure disk, and the stop block cover is connected to the stop block and limits the stop post in the wedge cavity; when the motor rotates clockwise to drive the eccentric structure disk clockwise, the eccentric structure disk drives the stop post to roll in the expanding direction of the wedge cavity, and the one-way stop module will not stop the rotation of the eccentric structure disk; when the motor rotates counterclockwise to drive the eccentric structure disk to rotate counterclockwise, the eccentric structure disk drives the stop post to roll in the shrinking direction of the wedge cavity, and the friction resistance between the stop post and the inner wall of the wedge cavity and the outer wall of the eccentric structure disk stops the rotation of the eccentric structure disk.

7. The rapid constant force clamping rotary fixture system according to claim 6, characterized in that: An elastic jackscrew mechanism is connected in the wedge-shaped cavity, and the elastic jackscrew mechanism provides elastic force to drive the stop column to move in the shrinking direction of the wedge-shaped cavity.

8. The rapid constant force clamping rotary fixture system according to claim 1, characterized in that: Both ends of the constant force spring are provided with a hanging hole, a tensioning ring is passed through the hanging hole, and a screw is passed through the tensioning ring. The two ends of the constant force spring are fixedly connected to the eccentric structure disk and the outer shell respectively through the screws.

9. The rapid constant force clamping rotary fixture system according to claim 2, characterized in that: The two guide rails of the cross roller guide rail are V-shaped guide rails, one of the V-shaped guide rails is fixedly connected to the housing by bolts, and the other V-shaped guide rail is fixedly connected to the slider by bolts.

10. The rapid constant force clamping rotary fixture system according to claim 2, characterized in that: A clearance adjustment component is connected to the shell on one side of the slider, and the slider and the cross roller guides on both sides thereof are tightened to the shell on the other side of the slider through the clearance adjustment component; the clearance adjustment component includes a movable ejector pin and a tightening screw, and the shell is provided with a ejector pin sliding hole and a tightening threaded hole which are coaxial and interconnected, the movable ejector pin is slidably arranged in the ejector pin sliding hole, and the tightening screw is threadedly connected to the tightening threaded hole, and the two ends of the movable ejector pin are respectively in contact with the cross roller guide on one side of the slider and the tightening screw, and the movable ejector pin is tightened by the tightening screw to tighten the slider and the cross roller guides on both sides thereof to the shell, so that the cross roller guides have zero clearance rolling fit.

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