CN112600353A - Perforating device of stepless speed regulation - Google Patents
Perforating device of stepless speed regulation Download PDFInfo
- Publication number
- CN112600353A CN112600353A CN202011551666.8A CN202011551666A CN112600353A CN 112600353 A CN112600353 A CN 112600353A CN 202011551666 A CN202011551666 A CN 202011551666A CN 112600353 A CN112600353 A CN 112600353A
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- Prior art keywords
- rotor
- stator
- plate
- push
- sliding
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- 238000004080 punching Methods 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims description 10
- 230000005662 electromechanics Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
- H02K7/145—Hand-held machine tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
- B23B45/02—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor driven by electric power
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/12—Structural association with clutches, brakes, gears, pulleys or mechanical starters with auxiliary limited movement of stators, rotors or core parts, e.g. rotors axially movable for the purpose of clutching or braking
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/12—Structural association with clutches, brakes, gears, pulleys or mechanical starters with auxiliary limited movement of stators, rotors or core parts, e.g. rotors axially movable for the purpose of clutching or braking
- H02K7/125—Structural association with clutches, brakes, gears, pulleys or mechanical starters with auxiliary limited movement of stators, rotors or core parts, e.g. rotors axially movable for the purpose of clutching or braking magnetically influenced
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention provides a punching device with stepless speed regulation, and belongs to the technical field of electromechanics. The motor comprises a shell, a rotor, a cylindrical stator, a rotating shaft and a push rod, wherein a sliding cavity is formed in the shell, a push plate is connected in the sliding cavity in a sliding mode, the push rod is fixedly connected to the rear end face of the push plate, a brake plate is connected to the front end face of the push plate in a rotating mode, the rotor is fixed on the brake plate, the stator is fixed in the sliding cavity, a compression spring is connected between the push plate and the inner wall of the sliding cavity, the rear end of the rotating shaft is fixedly connected with the rotor, and a tool fixture is arranged at; the rotor comprises a framework and a plurality of permanent magnets fixed on the framework, and the stator comprises a winding which can be matched with the rotor; the rotor can be inserted into the stator. The invention has the advantages of universality, high safety and the like.
Description
Technical Field
The invention belongs to the technical field of electromechanics, and relates to a punching device with stepless speed regulation.
Background
The punching device generally comprises a motor and a cutter tool arranged at the end part of an output shaft of the motor, and is not suitable for automatic feeding for punching of an object with higher hardness, but needs to act on a machine body through a manual shaft to drive a cutter head to feed, so that the following defects exist in the operation process of the punching device:
1. after the starter motor, the cutter begins rotatoryly promptly, rotates with higher speed moreover, is unfavorable for the fixed point of the position of punching, causes the cutter easily moreover and causes the tool bit "the side to float" when treating the contact of processing position, has the potential safety hazard.
2. The rotating speed of the cutter can not be adjusted in a stepless mode, so that the hole opening precision is low, and the adaptability and the universality are poor when objects made of different materials are machined.
3. After the machining is finished, the cutter still continues to rotate due to inertia, potential safety hazards exist, and the hole opening efficiency is influenced.
4. When the situation such as cutter card is dead appears, the cutter can not be controlled to be pulled out through the change of torque, and then the situation of cutter clamping exists, and the processing quality is influenced.
Disclosure of Invention
The invention aims to provide a punching device with stepless speed regulation aiming at the problems in the prior art, and the technical problem to be solved by the invention is how to improve the universality and the safety.
The purpose of the invention can be realized by the following technical scheme: a punching device with stepless speed regulation is characterized by comprising a shell, a rotor, a cylindrical stator, a rotating shaft and a push rod, wherein a sliding hole is formed in the shell, a push plate is connected in the sliding hole in a sliding mode, the push rod is fixedly connected to the rear end face of the push plate, a brake plate is connected to the front end face of the push plate in a rotating mode, the rotor is fixed on the brake plate, the stator is fixed in the sliding hole, a compression spring is connected between the push plate and the inner wall of the sliding hole, the rear end of the rotating shaft is fixedly connected with the rotor, and a cutter tool is arranged at the outer end of the rotating shaft;
the rotor comprises a framework and a plurality of permanent magnets fixed on the framework, and the stator comprises a winding which can be matched with the rotor; the rotor can be inserted into the stator.
The push rod is provided with a sliding hole, a pull rod is connected in the sliding hole in a sliding mode, a pressing plate is fixedly arranged at the rear end of the pull rod, a conical driving block is fixedly arranged at the inner end of the pull rod, the front end of the driving block is provided with a braking piece, and a first reset spring is connected between the pull rod and the inner wall of the sliding hole;
the push pedal is last evenly to be provided with a plurality of locating component of circumference, locating component includes radially sets up the guiding hole in the push pedal, sliding connection has a guide bar in the guiding hole, the fixed locating plate that is provided with in outer end of guide bar, be provided with a second reset spring between guide bar and the guiding hole inner wall, the guide bar inner supports and leans on global of drive block.
Furthermore, an avoiding hole is formed in the rear end of the push rod, the pressing plate is located in the avoiding hole, and a handle is fixedly arranged on the shell.
Further, when the push block is located at the rearmost end of the sliding hole, the rotor is located outside the stator.
In the initial state, even if the winding on the stator is electrified, the rotor cannot rotate because the rotor is positioned outside the stator, so the punching device can keep a constant electrified state in the construction process.
Determination and alignment of the punch position: the handle is held by one hand, fingers of the other hand are inserted into the avoiding hole, the palm abuts against the rear end of the push rod, the pressing plate is lightly pressed by the fingers, the pull rod moves a small distance to the rear end, and at the moment, the driving block at the front end of the pull rod can not enable the positioning plate to abut against the inner wall of the sliding hole, and the braking piece can also be enabled to be separated from the braking plate;
stepless regulation of the rotating speed: the push rod can be pushed to move in the slide hole to control the depth of the rotor entering the stator, and the permanent magnet group on the rotor can be ensured to rotate under the action of the electrified winding on the stator. In the process, on one hand, the rotating shaft can be ensured to be in a static state before the cutter is positioned, and on the other hand, the rotating speed of the rotating shaft can be controlled to be steplessly increased so as to ensure accurate positioning and high hole opening precision.
Maintaining the rotating speed: in the punching and feeding process after positioning is finished, the pressing plate can be pressed, the pull rod is pulled backwards for a large distance, so that the driving block can drive the positioning plate to abut against the inner wall of the slide hole, and the position of the rotor in the stator is determined to maintain a specific rotating speed.
Braking and stopping: after the punching is finished, the pressing plate can be loosened, and the brake disc is close to the brake plate under the action of the first return spring, so that the rotor is stopped quickly.
When the cutter is jammed, the torque of the rotor can be controlled to be increased, so that the cutter can be smoothly taken out.
Aiming at the requirements of different materials, different hardness and different processing precision, the rotating speed and the torque of the rotor can be controlled to be in the best processing state, so that the equipment has better universality and applicability, more stable holding and control in the processing process and high safety factor.
The push plate is connected with the sliding hole through a spline, and a winding on the stator can be directly connected with electricity without structures such as an electric brush and the like, so that the structure is simple and reliable.
Drawings
FIG. 1 is a schematic view of the punching apparatus.
FIG. 2 is a sectional view of the punching apparatus.
Fig. 3 is an enlarged view of a portion a in fig. 2.
In the figure, 1, a housing; 2. a rotor; 3. a stator; 4. a rotating shaft; 5. a push rod; 61. a slide hole; 62. pushing the plate; 63. a brake plate; 64. a compression spring; 65. tool tooling; 66. a pull rod; 67. pressing a plate; 68. a drive block; 69. a brake pad; 71. a first return spring; 72. a guide bar; 73. positioning a plate; 74. a second return spring; 8. a handle.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, fig. 2 and fig. 3, the device includes a casing 1, a rotor 2, a cylindrical stator 3, a rotating shaft 4 and a push rod 5, wherein the casing 1 has a slide hole 61 therein, the slide hole 61 is slidably connected with a push plate 62, the push rod 5 is fixedly connected to a rear end surface of the push plate 62, a brake plate 63 is rotatably connected to a front end surface of the push plate 62, the rotor 2 is fixed to the brake plate 63, the stator 3 is fixed in the slide hole 61, a compression spring 64 is connected between the push plate 62 and an inner wall of the slide hole 61, a rear end of the rotating shaft 4 is fixedly connected to the rotor 2, and an outer end of the rotating shaft 4 is provided with a;
the rotor 2 comprises a framework and a plurality of permanent magnets fixed on the framework, and the stator 3 comprises a winding which can be matched with the rotor 2; the rotor 2 can be inserted into the stator 3.
A sliding hole is formed in the push rod 5, a pull rod 66 is connected in the sliding hole in a sliding mode, a pressing plate 67 is fixedly arranged at the rear end of the pull rod 66, a conical driving block 68 is fixedly arranged at the inner end of the pull rod 66, a brake pad 69 is arranged at the front end of the driving block 68, and a first return spring 71 is connected between the pull rod 66 and the inner wall of the sliding hole;
the push plate 62 is circumferentially and uniformly provided with a plurality of positioning assemblies, each positioning assembly comprises a guide hole radially formed in the push plate 62, a guide rod 72 is slidably connected in each guide hole, the outer end of each guide rod 72 is fixedly provided with a positioning plate 73, a second reset spring 74 is arranged between each guide rod 72 and the inner wall of each guide hole, and the inner end of each guide rod 72 abuts against the peripheral surface of the driving block 68.
The rear end of the push rod 5 is provided with an avoiding hole, the press plate 67 is positioned in the avoiding hole, and the casing 1 is fixedly provided with a handle 8. When the push block is positioned at the rearmost end of the slide hole 61, the rotor 2 is positioned outside the stator 3.
In the initial state, even if the winding on the stator 3 is electrified, the rotor 2 can not rotate because the rotor 2 is positioned outside the stator 3, so the perforating device can keep a normal electrified state in the construction process.
Determination and alignment of the punch position: the handle 8 is held by one hand, the fingers of the other hand are inserted into the avoidance hole, the palm abuts against the rear end of the push rod 5, the pressing plate 67 is slightly pressed by the fingers, the pull rod 66 moves a short distance towards the rear end, and at the moment, the driving block 68 at the front end of the pull rod 66 can not enable the positioning plate 73 to abut against the inner wall of the sliding hole, and the braking piece 69 can be separated from the braking plate 63;
stepless regulation of the rotating speed: the depth of the rotor 2 entering the stator 3 can be controlled by pushing the push rod 5 to move in the slide hole 61, and the permanent magnet group on the rotor 2 can also be ensured to rotate under the action of the electrified winding on the stator 3. In the process, on one hand, the rotating shaft 4 can be ensured to be in a static state before the cutter is positioned, and on the other hand, the rotating speed of the rotating shaft 4 can be controllably and steplessly increased, so that the positioning accuracy and the hole opening accuracy are ensured to be high.
Maintaining the rotating speed: in the punching and feeding process after positioning, the pressing plate 67 can be pressed, so that the pull rod 66 is pulled backwards for a larger distance, and the driving block 68 can drive the positioning plate 73 to abut against the inner wall of the slide hole 61, thereby determining the position of the rotor 2 in the stator 3 to maintain a specific rotating speed.
Braking and stopping: after the punching is completed, the pressure plate 67 is released, and the brake pad 69 is brought close to the brake plate 63 by the first return spring 71, so that the rotor 2 is stopped quickly.
When the cutter is jammed, the torque of the rotor 2 can be controlled to be increased so that the cutter can be smoothly taken out.
Aiming at the requirements of different materials, different hardness and different processing precision, the rotating speed and the torque of the rotor 2 can be controlled to be in the best processing state, so that the equipment has better universality and applicability, more stable holding and control in the processing process and high safety factor.
The push plate 62 is connected with the slide hole 61 through a spline, and a winding on the stator 3 can be directly connected with electricity without structures such as an electric brush and the like, so that the structure is simple and reliable.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (3)
1. The punching device with the stepless speed regulation function is characterized by comprising a machine shell (1), a rotor (2), a cylindrical stator (3), a rotating shaft (4) and a push rod (5), wherein a sliding cavity (61) is formed in the machine shell (1), a push plate (62) is connected in the sliding cavity (61) in a sliding mode, the push rod (5) is fixedly connected to the rear end face of the push plate (62), a brake plate (63) is connected to the front end face of the push plate (62) in a rotating mode, the rotor (2) is fixed to the brake plate (63), the stator (3) is fixed in the sliding cavity (61), a compression spring (64) is connected between the push plate (62) and the inner wall of the sliding cavity (61), the rear end of the rotating shaft (4) is fixedly connected with the rotor (2), and a cutter tool (65) is arranged at the outer end of the rotating shaft (4);
the rotor (2) comprises a framework and a plurality of permanent magnets fixed on the framework, and the stator (3) comprises a winding which can be matched with the rotor (2); the rotor (2) can be inserted into the stator (3);
a sliding hole is formed in the push rod (5), a pull rod (66) is connected in the sliding hole in a sliding mode, a pressing plate (67) is fixedly arranged at the rear end of the pull rod (66), a conical driving block (68) is fixedly arranged at the inner end of the pull rod (66), a braking block (69) is arranged at the front end of the driving block (68), and a first return spring (71) is connected between the pull rod (66) and the inner wall of the sliding hole;
circumference evenly is provided with a plurality of locating component on push pedal (62), locating component is including radially seting up the guiding hole on push pedal (62), sliding connection has a guide bar (72) in the guiding hole, the outer end of guide bar (72) is fixed and is provided with a locating plate (73), be provided with a second reset spring (74) between guide bar (72) and the guiding hole inner wall, guide bar (72) inner supports and leans on global of drive block (68).
2. The perforating device of stepless speed regulation according to claim 1, characterized in that the rear end of the push rod (5) is provided with an avoiding hole, the press plate (67) is positioned in the avoiding hole, and a handle (8) is fixedly arranged on the casing (1).
3. A stepless speed-regulating perforating device as claimed in claim 1 or 2, characterized in that, when the push block is located at the rearmost end of the slide chamber (61), the rotor (2) is located outside the stator (3).
Priority Applications (1)
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CN202011551666.8A CN112600353B (en) | 2020-12-24 | 2020-12-24 | Stepless speed regulating punching device |
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CN202011551666.8A CN112600353B (en) | 2020-12-24 | 2020-12-24 | Stepless speed regulating punching device |
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CN112600353A true CN112600353A (en) | 2021-04-02 |
CN112600353B CN112600353B (en) | 2024-05-24 |
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Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1375742A (en) * | 1971-01-13 | 1974-11-27 | ||
WO2003077403A1 (en) * | 2002-03-08 | 2003-09-18 | Zepp Lawrence P | Brushless permanent magnet motor or alternator with variable axial rotor/stator alignment to increase speed capability |
RU2655378C1 (en) * | 2017-03-27 | 2018-05-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") | Self-braking double axial asynchronous electric motor for flow line drive |
CN208675035U (en) * | 2018-09-05 | 2019-03-29 | 武汉船舶职业技术学院 | A kind of motor with automatic control rotating speed functions |
CN110273930A (en) * | 2019-07-15 | 2019-09-24 | 上海倪儿饰品有限公司 | A kind of ball-type ceramic shaft bearing ball equipment |
CN110677001A (en) * | 2019-10-23 | 2020-01-10 | 陈思宇 | Three-winding motor with lifting force buffering function |
CN211249148U (en) * | 2019-09-30 | 2020-08-14 | 江苏汤臣汽车零部件有限公司 | Automobile locking clutch pressure plate drilling tool |
CN112658329A (en) * | 2020-12-24 | 2021-04-16 | 湖北科技学院 | Punching processing method |
CN213937657U (en) * | 2020-12-24 | 2021-08-10 | 湖北科技学院 | Perforating device of stepless speed regulation |
-
2020
- 2020-12-24 CN CN202011551666.8A patent/CN112600353B/en active Active
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1375742A (en) * | 1971-01-13 | 1974-11-27 | ||
WO2003077403A1 (en) * | 2002-03-08 | 2003-09-18 | Zepp Lawrence P | Brushless permanent magnet motor or alternator with variable axial rotor/stator alignment to increase speed capability |
CN1639947A (en) * | 2002-03-08 | 2005-07-13 | 劳伦斯·P·策普 | Brushless permanent magnet motor or alternator with variable axial rotor/stator alignment to increase speed capability |
RU2655378C1 (en) * | 2017-03-27 | 2018-05-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") | Self-braking double axial asynchronous electric motor for flow line drive |
CN208675035U (en) * | 2018-09-05 | 2019-03-29 | 武汉船舶职业技术学院 | A kind of motor with automatic control rotating speed functions |
CN110273930A (en) * | 2019-07-15 | 2019-09-24 | 上海倪儿饰品有限公司 | A kind of ball-type ceramic shaft bearing ball equipment |
JP6748834B1 (en) * | 2019-07-15 | 2020-09-02 | 广州欧享科技有限公司 | Ball mounting equipment for ball type ceramic bearings |
CN211249148U (en) * | 2019-09-30 | 2020-08-14 | 江苏汤臣汽车零部件有限公司 | Automobile locking clutch pressure plate drilling tool |
CN110677001A (en) * | 2019-10-23 | 2020-01-10 | 陈思宇 | Three-winding motor with lifting force buffering function |
CN112658329A (en) * | 2020-12-24 | 2021-04-16 | 湖北科技学院 | Punching processing method |
CN213937657U (en) * | 2020-12-24 | 2021-08-10 | 湖北科技学院 | Perforating device of stepless speed regulation |
Non-Patent Citations (2)
Title |
---|
施汉基, 张世亮, 王筱珍: "电液式交流电动机工频无级调速系统的研究", 电工电能新技术, no. 02, 23 April 1999 (1999-04-23) * |
董韬;谢荣;王培森;: "无级调矩三相异步电动机结构设计与分析", 微电机, no. 11, 28 November 2017 (2017-11-28) * |
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