CN210161230U

CN210161230U - Novel flexible material cutter head mechanism

Info

Publication number: CN210161230U
Application number: CN201920999249.6U
Authority: CN
Inventors: 陈华蕴; 田野; 岳鑫; 李西兵; 汤舒生
Original assignee: Fujian Agriculture and Forestry University
Current assignee: Fujian Agriculture and Forestry University
Priority date: 2019-06-30
Filing date: 2019-06-30
Publication date: 2020-03-20
Anticipated expiration: 2029-06-30

Abstract

The utility model provides a novel flexible material cutter head mechanism, which comprises a frame and a servo motor fixed on the frame, wherein the rotating shaft of the servo motor is fixedly connected with an output shaft through a shaft coupling, the end part of the output shaft is fixedly connected with an eccentric wheel, the eccentric wheel is eccentrically connected with a driving connecting rod, the lower part of the driving connecting rod is connected with a guide shaft which is longitudinally arranged through a lower bearing, the lower end of the guide shaft is fixedly connected with a cutter clamp, a cutter is fixed in the cutter clamp, the motor comprises an outer shell and a stator core in the outer shell, a rotor which is positioned in the middle of the stator core is fixed on the rotating shaft, a quincuncial groove is arranged on the periphery of the rotor, a fan which is positioned at the rear side of the rotor is also fixed on the rotating shaft, and the rear side of the outer shell of the motor is provided with a ventilation, the cutter head mechanism can be buffered and damped, and cutting marking precision is improved.

Description

Novel flexible material cutter head mechanism

Technical Field

The utility model relates to a novel flexible material cutter head mechanism.

Background

With the development of the modern machining industry, the requirements on the cutting quality and precision are continuously improved, and the requirements on improving the production efficiency, reducing the production cost and having a high-intelligent automatic cutting function are also improved. For flexible material cutting, the widely applied cutting technologies of enterprise factories are laser cutting, plasma cutting and cutter cutting. The laser cutting machine has the fastest efficiency, the highest cutting precision and generally smaller cutting thickness. The plasma cutting machine has the advantages that the cutting speed is high, the cutting surface has a certain inclination, the existing cutter has the functions of cutting and marking, but dynamic pressure can be generated between a motor shaft and a bearing due to the fact that the mass distribution of a motor rotor is asymmetric; the centrifugal force of the eccentric wheel is too large; the motor shaft is directly matched with the eccentric wheel and is easy to wear; in the course of the work, the motor receives the influence in aspects such as hot phenomenon, leads to the cutting tool bit to produce vibration easily and resonance even to the precision that has led to cutting and mark receives very big influence, often takes place often because the vibration leads to the phenomenon that the tool bit damages unable normal work when cutting moreover, seriously influences the work efficiency of machine. The invention aims to provide a flexible material cutting tool bit mechanism capable of reducing vibration and a novel motor with a heat dissipation function through the improvement of a tool bit structure and the invention design of the motor, so that the cutting and marking accuracy can be improved, the occurrence rate of the damage phenomenon of the cutting tool bit can be reduced, and the working and production efficiency of the tool bit can be improved.

Disclosure of Invention

The utility model discloses improve above-mentioned problem, promptly the utility model discloses the technical problem that solves in the course of the work, the motor receives the aspect influence such as hot phenomenon, leads to the cutting tool bit to produce vibration resonance even easily to the precision that has leaded to cutting and mark receives very big influence.

The utility model discloses a concrete implementation scheme is: a novel flexible material cutter head mechanism comprises a frame and a servo motor fixed on the frame, wherein a rotating shaft of the servo motor is fixedly connected with an output shaft through a coupler, the end part of the output shaft is fixedly connected with an eccentric wheel, the eccentric wheel is eccentrically connected with a driving connecting rod through a penetrating optical axis, the lower part of the driving connecting rod is connected with a guide shaft which is longitudinally arranged through a lower bearing, the lower end of the guide shaft is fixedly connected with a cutter clamp, a cutter is fixed in the cutter clamp, the motor comprises an outer shell and a stator core arranged in the outer shell, the rotating shaft is fixed in the middle of the outer shell through motor bearings at two ends of the outer shell, a rotor positioned in the middle of the stator core is fixed on the rotating shaft, a quincuncial groove is formed in the periphery of the rotor, a fan positioned at the rear side of the rotor is, the fan can discharge the temperature in the outer shell to the ventilation opening.

Further, eccentric wheel upper portion has the arc recess, the arc recess is embedded to have the arc balancing weight, servo motor has the shock pad with the fixed connection face of frame.

Further, the tool holder is fixedly connected with the guide shaft through a longitudinal connecting rod.

Furthermore, the rack is in a crutch shape, the servo motor is fixed on a vertical surface of the crutch-shaped rack, and the guide shaft longitudinally penetrates through a horizontal surface of the rack.

Furthermore, an upper rolling bearing is fixed on the upper portion of the driving connecting rod, a lower portion of the driving connecting rod is fixed on the bearing, the optical axis penetrates through the middle portion of the upper rolling bearing, and the upper end of the guide shaft is fixedly connected with a connecting rod shaft penetrating through the middle portion of the lower bearing.

Further, the output end of the output shaft is matched with the cam key groove.

Further, the coupler is a cross stop screw type coupler.

Furthermore, the middle part of the cutter clamp is provided with an opening for placing a cutter, and the cutter is provided with a through locking bolt.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses a fan to the motor axis of rotation can also reach the effect that reduces the thermal production of motor when moving under the condition of exporting same power, through shock pad and counter weight in the embodiment in addition, can play the effect of buffering damping to tool bit mechanism, and then improve the cutting mark precision.

Drawings

Fig. 1 is a schematic view of the overall connection structure of the present invention.

Fig. 2 is a schematic view of the connection structure of the eccentric wheel and the driving connecting rod of the present invention.

Fig. 3 is a schematic view of the counterweight structure of the present invention.

Fig. 4 is a schematic view of the eccentric wheel structure of the present invention.

Fig. 5 is the utility model discloses servo motor and shaft coupling decomposition structure sketch map.

Fig. 6 is the internal structure section of the servo motor of the present invention.

Fig. 7 is a schematic view of the cross-sectional structure of the rotor of the servo motor of the present invention.

In the figure, 1, a variable speed servo motor, 2, a frame, 3, a cylindrical head screw, 4, a motor shaft, 5, a cross stop screw type coupling, an output shaft, 7, an eccentric wheel, 8, a driving connecting rod, 9, a driving connecting rod shaft, 10, a guide shaft, 11, a connecting rod, 12, a tool holder, 13, a blade, 14, an optical shaft, 15, an upper rolling bearing, 18, a cylindrical head screw, 19, a balancing weight, 20, a key groove matching part of the eccentric wheel, 21, a balancing weight groove, 22, a shock pad, 23, a motor bearing, 24, a heat flow conduction groove, 25, a fan, 26, a stator iron core and 27 rotor shafts are arranged.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 7, a novel flexible material cutting head mechanism comprises a frame 2, in this embodiment, the frame 2 is in a crank shape, a variable speed servo motor 1 is fixed at a vertical part of the frame 2, the variable speed servo motor 1 is fastened on the frame 2 through four cylindrical head screws 3, a shock pad 22 is installed at a front section of the variable speed servo motor 1, a motor shaft 4 is fastened and connected with an output shaft 6 through a cross stop screw type coupling 5, an output end of the output shaft 6 is fixed with an eccentric wheel 7, the output shaft 6 is connected with the eccentric wheel 7 through a 20-key slot fit, so as to ensure that the eccentric wheel 7 rotates when the output shaft rotates, the eccentric wheel 7 is in lubrication eccentric connection with a driving connecting rod 8 through a 14 optical axis, an upper rolling bearing 15 is arranged on an upper portion of the driving connecting rod 8, the upper rolling bearing 15 plays a role of supporting a limit optical axis 14, and, the driving connecting rod shaft 9 is supported by a lower rolling bearing, the lower end of the guide shaft 10 is fixedly connected with a connecting rod 11, and the cutter holder 12 is fixedly connected with the connecting rod 11 and the blade 13 through four cylindrical head screws 16.

In this embodiment, the upper portion of the eccentric wheel 7 has a counterweight groove 21, which is arc-shaped in this embodiment, and the counterweight 19 is embedded in the counterweight groove 21.

When the cutting tool works, the variable-speed servo motor 1 drives the output shaft 6 to rotate through the motor shaft 4 and the cross stop screw type coupler 5, the output shaft 6 drives the eccentric wheel to do 7 rotary motion, the eccentric wheel 7 is eccentrically connected with the driving connecting rod 8, the driving connecting rod 8 is hinged with the guide shaft 10, the eccentric wheel 7, the driving connecting rod 8 and the guide shaft 10 form a crank block mechanism, the rotary motion of the eccentric wheel 7 forms the up-and-down reciprocating motion of the guide shaft 10, the guide shaft 10 is connected with the connecting rod 11 in a fastening mode through the locking nut 16 and the elastic washer 17 to do the up-and-down reciprocating motion, and the connecting rod 11 drives the tool holder 12 and the blade 13 to do the up-and-down reciprocating motion through the fastening effect.

The servo motor of this embodiment is three-phase asynchronous motor, the motor includes the stator core 26 of laying in shell body and the shell body, the inside motor bearing 23 that has rotor shaft 27 through the shell body both ends of motor is fixed in the shell body middle part, rotor shaft 27 includes the pivot at middle part and is fixed with the rotor that is located stator core middle part, the plum blossom groove has been seted up to the rotor periphery, still be fixed with the fan 25 that is located the rotor rear side in the axis of rotation, motor housing body rear side has the vent, the fan enables the inside temperature of shell body and discharges to the vent, and the output of rotor shaft 27 is motor shaft 4 in this embodiment promptly.

In this embodiment, the fan 25 is fastened to the rotor shaft 27 by screws, and rotates with the rotor shaft 27, the two ends of the motor housing support and radially and axially fix and constrain the motor by the motor bearings 23, and the stator cores 26 are uniformly distributed around the circumference in the motor.

The alternating current is utilized to provide a rotating magnetic field for the stator core 26 of the motor, the rotor shaft 27 generates induction torque through magnetic induction to rotate, and in the operation process of the motor, because stator copper loss, rotor copper loss, iron loss and additional loss exist, the loss can cause the motor to generate heat additionally, and the service life of the motor is greatly damaged, so that the fan 25 is added in the design of the motor, the rotor shaft 27 drives the fan 25 to rotate, so that airflow changes, hot air generated at the magnetic field positions of the stator core 26 and the rotor shaft 27 is output to the outside air through the ventilation opening through the heat flow conduction groove 24, and the heat dissipation effect of the motor is achieved. In the design, the groove type of the rotor is optimally designed, the groove type of the rotor in the motor in the current market is generally divided into a round bottom groove, a flat bottom groove and a pear-shaped groove, the rotor of the motor is designed into a plum blossom groove, the weight reduction design of the rotor is realized, and the influence of dynamic pressure between a motor shaft and a bearing caused by insufficient machining precision and uneven rotor mass distribution is reduced through the weight reduction design; the stator iron cores of the motor are uniformly distributed around the circumference to replace the groove-shaped distribution of the stator in the conventional motor, and the effect of reducing the heat generation during the operation of the motor can be achieved under the condition of outputting the same power. When the motor works, oil lubrication is needed to be added to the bearings at the two ends of the motor, so that the abrasion of the joint of the motor shaft and the bearings and the absorption of heat generated by the friction of the motor shaft and the bearings can be reduced. The motor shell is made of the regenerated aluminum material, the regenerated aluminum material has the advantages of good sound insulation effect, low cost, high strength, light weight, capability of absorbing impact force and the like, and the regenerated aluminum material is used for reducing noise and vibration generated by high-speed operation of the motor shell.

Because the output rotating speed of a motor applied to the existing cutting knife head is 18000r/min, in the process of continuously outputting cutting operation and frequently starting and closing, the energy consumption of the motor is larger, the vibration and noise of the knife head are larger and larger as the swing amplitude of a motor shaft is larger and larger as the working time is longer, the motor can regulate and control the operation process of the cutting knife through a frequency converter and a servo motor in a frequency conversion manner, the energy loss of the motor in the working process is reduced, and the purpose of vibration reduction is achieved, a shock pad is arranged at the front section of the motor, the temperature resistance range is-20 ℃ to 90 ℃, the damping ratio is more than or equal to 0.08, and the shock insulation and sound insulation; in the embodiment, a cross stop screw type coupling 5 is used for transitionally connecting the motor shaft and an output shaft, belongs to an elastic coupling and has the functions of torque transmission, fastening connection, support and the like, and the motor shaft also has the functions of buffering and vibration reduction due to the action of an elastic element in the coupling, and can also compensate possible deviation of two axes to different degrees by utilizing elastic deformation; in addition, the proper mass is added into the counterweight groove, so that the effect of buffering and damping can be achieved on the cutter head mechanism (the mass of the added counterweight is 51g, the material is 45 steel), the mass center of the eccentric wheel is close to the rotation center due to the added mass, the centrifugal effect is reduced during the rotation motion of the eccentric wheel, the centrifugal swing amplitude of the eccentric wheel is reduced, and the damping effect is achieved.

Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.

If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.

Also, above-mentioned the utility model discloses if disclose or related to mutually fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.

The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims

1. The novel flexible material cutter head mechanism is characterized by comprising a rack and a servo motor fixed on the rack, wherein a rotating shaft of the servo motor is fixedly connected with an output shaft through a coupler, the end part of the output shaft is fixedly connected with an eccentric wheel, the eccentric wheel is eccentrically connected with a driving connecting rod through a penetrating optical axis, the lower part of the driving connecting rod is connected with a guide shaft which is longitudinally arranged through a lower bearing, the lower end of the guide shaft is fixedly connected with a cutter clamp, a cutter is fixed in the cutter clamp, the motor comprises an outer shell and a stator core arranged in the outer shell, the rotating shaft is fixed in the middle of the outer shell through motor bearings at two ends of the outer shell, a rotor positioned in the middle of the stator core is fixed on the rotating shaft, a quincuncial groove is formed in the periphery of the rotor, a fan positioned on the rear side of the rotor is also, the fan can discharge the temperature in the outer shell to the ventilation opening.

2. The novel flexible material cutter head mechanism of claim 1, wherein the upper portion of the eccentric wheel is provided with an arc-shaped groove, an arc-shaped balancing weight is embedded in the arc-shaped groove, and a damping pad is arranged on the fixed connection surface of the servo motor and the frame.

3. The novel flexible material cutting bit mechanism of claim 2, wherein the knife holder is fixedly connected to the guide shaft via a longitudinal link.

4. The novel flexible material cutting bit mechanism of claim 3, wherein the frame is in the shape of a crutch, the servo motor is fixed to a vertical surface of the crutch frame, and the guide shaft longitudinally passes through a horizontal surface of the frame.

5. The novel flexible material cutter head mechanism according to claim 3, wherein the upper portion of the driving connecting rod is fixed with an upper rolling bearing, the lower portion of the driving connecting rod is fixed with a lower bearing, the optical axis passes through the middle portion of the upper rolling bearing, and the upper end of the guide shaft is fixedly connected with a connecting rod shaft passing through the middle portion of the lower bearing.

6. The novel flexible material cutting bit mechanism of claim 1, wherein the output end of the output shaft is mated with a cam keyway.

7. The novel flexible material cutting bit mechanism of claim 2, wherein the coupling is a cross stop screw type coupling.

8. The novel flexible material cutting bit mechanism of claim 1, wherein the middle of the tool holder has an opening for receiving a tool, and the tool has a locking bolt extending therethrough.