CN110994856A - Direct drive mechanism of radial plastic forming die - Google Patents
Direct drive mechanism of radial plastic forming die Download PDFInfo
- Publication number
- CN110994856A CN110994856A CN201911292955.8A CN201911292955A CN110994856A CN 110994856 A CN110994856 A CN 110994856A CN 201911292955 A CN201911292955 A CN 201911292955A CN 110994856 A CN110994856 A CN 110994856A
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- stator
- die
- motor
- permanent magnet
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/18—Drives for forging presses operated by making use of gearing mechanisms, e.g. levers, spindles, crankshafts, eccentrics, toggle-levers, rack bars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Linear Motors (AREA)
Abstract
The invention discloses a direct-drive mechanism of a radial plastic forming die, which is characterized in that 4 switching flux permanent magnet linear motors coaxially and symmetrically arranged on a die driving disc respectively drive 4 dies to do radial reciprocating motion, and the switching flux permanent magnet motors directly drive the die driving disc to rotate. The whole structure of the equipment is simplified and simple by a direct driving mode, and the running precision is improved; the structure robustness of the rotary driving shaft and the die feeding shaft is strong by adopting the switching flux motor, and the dynamic response speed and the impact load resistance capability are favorably improved. In addition, the number of the radially fed dies and the driving motors thereof can be configured according to the process requirements, so that the multifunctional plastic forming process is realized.
Description
Technical Field
The invention belongs to the technical field of forging and pressing plastic forming equipment, and particularly relates to a direct-drive mechanism of a radial plastic forming die.
Background
An electromechanical spindle driving system of the existing radial forging plastic forming equipment generally comprises a traditional three-phase asynchronous motor, a multistage gear pair mechanism and other boosting transmission mechanisms, and a die feeding mechanism comprises a ball screw, a worm gear, a gear rack and other rotating linear conversion mechanisms. The system has a complex structure and a long transmission chain, is difficult to realize an energy-saving emission-reducing, efficient and precise forming process, and particularly meets the forming precision and quality requirements of miniature workpieces.
The direct-drive large-torque permanent magnet synchronous motor directly drives the main shaft of the die to rotate, and the permanent magnet synchronous linear motor realizes the feeding motion of the die, so that the system structure can be greatly simplified, and the precision of drive control is improved. However, the existing permanent magnet synchronous motor and permanent magnet linear motor have higher requirements on structural reliability, are difficult to adapt to the impact load action of forging and pressing forming, are easy to damage, and have high cost, so that the die direct-drive transmission system is rarely applied and realized.
In view of the above technical problems, it is actually necessary to provide a novel radial plastic forming die direct-drive mechanism capable of overcoming the above defects, and a topological structure of a novel switching flux stator permanent magnet motor is adopted, so that the robust impact resistance and dynamic response precision of a driving shaft are improved, and various precision forming process requirements are met.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a direct drive mechanism of a radial plastic forming die, aiming at the defects in the prior art, the rotary drive of the die is realized by a switching flux permanent magnet motor, and the radial feed of the die is realized by a switching flux permanent magnet linear motor, so that the structure of the device is greatly simplified, and the forming speed, the forming precision and the dynamic response performance are improved.
The invention adopts the following technical scheme:
a direct-drive mechanism of a radial plastic forming die comprises a die driving disc, wherein the die driving disc is arranged at the front end of a driving shaft of a switching flux permanent magnet motor, 4 switching flux permanent magnet linear motors are arranged on the die driving disc along the radial direction, and the 4 switching flux permanent magnet linear motors are symmetrically arranged along the circumferential direction of the die driving disc at intervals and are used for driving the die to do reciprocating motion along the radial direction; the switch flux permanent magnet motor is arranged in the motor base.
Specifically, the switching flux permanent magnet linear motor is of a double-primary-stator single-secondary-rotor structure, a secondary rotor core is arranged between the two primary stators, and the secondary rotor core is of a double-sided salient pole type structure.
Furthermore, the primary stator is arranged on a primary stator bottom plate and fixed on the die driving disc through the primary stator bottom plate, the primary stator comprises a plurality of primary iron cores, the primary iron cores are in a U-shaped tooth-shaped arrangement structure, permanent magnets are arranged between the U-shaped teeth at intervals, and armature windings are wound in two adjacent U-shaped tooth grooves at intervals in an interval winding mode.
Furthermore, each pair of primary cores is fixed on the primary stator bottom plate at intervals through a core pressing plate.
Furthermore, two guide rail sliding block pairs are respectively arranged on two transverse sides of the secondary rotor core, the guide rail sliding block pairs are respectively connected with the die driving disc and the stator connecting plate, and two sides of the stator connecting plate are respectively connected with the two primary stator base plates.
Furthermore, a grating position sensor is arranged between one transverse side of the secondary rotor core and the stator connecting plate.
Specifically, switch magnetic flux permanent-magnet machine is including rotor core, and rotor core suit is on the excircle of drive shaft, and both ends all are provided with location snap ring, ball bearing and bearing end cover around rotor core, and ball bearing is connected with the motor end cover that sets up both ends around the motor frame.
Furthermore, the rotor core is of a salient pole type structure, and a reluctance rotary transformer is arranged between a motor cover and a bearing end cover at the rear end of the motor base.
Furthermore, the outer circle of the rotor core is circumferentially provided with a U-shaped stator core, the stator cores are circumferentially arranged on the inner circle of the motor base, magnetic steel is arranged between every two adjacent stator cores, and stator windings are wound in tooth grooves of the two adjacent stator cores in a concentrated winding mode in a crossing mode.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the direct-drive mechanism for the radial plastic forming die, the die driving disc is arranged at the front end of the driving shaft of the switching flux permanent magnet motor, the overall structure of the device is simplified in a direct driving mode, and the operation precision is improved; the topological structure of the switching flux motor enables the structure of the rotary driving shaft and the die feeding shaft to have strong robustness, and is beneficial to improving the dynamic response speed and the impact load resistance. In addition, the number of the radially-fed dies and the number of the driving motors thereof can be configured along the circumferential direction according to the process requirements, so that the multifunctional radial plastic forming process is realized.
Furthermore, the switching flux permanent magnet linear motor is of a double-primary-stator single-stage rotor structure, and each primary stator is composed of a primary iron core, an armature winding and a permanent magnet. The secondary rotor iron core is of a double-sided salient pole type structure, and is arranged on the inner side between the two primary stators. The double-primary single-secondary structure is compact, the output thrust density of the linear motor can be greatly improved, and the robustness of the secondary iron core rotor is strong.
Furthermore, the primary stator is arranged on a base plate of the primary stator, the primary iron core is in a U-shaped tooth arrangement structure, the permanent magnets are arranged between the U-shaped teeth at intervals, and the armature windings are wound in the two adjacent U-shaped tooth grooves at intervals in an interval winding mode. A pair of primary cores are fixed to a primary stator base plate through core pressing plates at a certain interval. The primary stator bottom plate is fixed on the die driving disc.
Furthermore, two guide rail sliding block pairs are respectively arranged on two transverse sides of the secondary rotor iron core and are respectively connected with the die driving disc and the stator connecting plate and used for guiding the movement of the secondary rotor iron core. Two sides of the stator connecting plate are respectively connected with the two primary stator bottom plates. And a grating position sensor is arranged between one transverse side of the secondary rotor core and the stator connecting plate and is used for measuring the feeding position and speed of the secondary rotor core driving die.
Furthermore, the switching flux permanent magnet motor is arranged in the motor base and comprises a driving shaft, a rotor core, a stator core, magnetic steel, a motor winding and the like, and the die driving disc is arranged at the front end of the driving shaft of the switching flux permanent magnet motor.
Furthermore, the rotor core is of a salient pole type structure, the rotor core is sleeved on the outer circle of the driving shaft, and the front end and the rear end of the rotor core are provided with a positioning snap ring, a ball bearing and a bearing end cover. The ball bearing is connected with the motor end cover, and the motor end cover is arranged at the front end and the rear end of the motor base. And a reluctance resolver is arranged between a motor cover and a bearing end cover at the rear end of the motor base and is used for measuring the rotating angle and the speed of the rotor and the driving shaft.
Furthermore, the outer circle of the rotor core is circumferentially provided with a U-shaped stator core, the stator cores are circumferentially arranged on the inner circle of the motor base, the magnetic steel is embedded between two adjacent stator cores, and the stator windings are wound in the tooth grooves of the two adjacent stator cores in a concentrated winding mode in a crossing mode. The winding and the magnetic steel of the switch magnetic flux motor are both arranged on the motor stator, so that the structure robustness of the driving shaft for driving the disc by the driving die is strong.
In conclusion, the invention has simple and compact integral structure and high flexible degree of freedom, and is particularly suitable for the precise radial forming process of various precise shaft cylinder parts.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic three-dimensional overall view of the present invention;
FIG. 2 is a schematic structural view of a mold drive disk;
FIG. 3 is a central axial cross-sectional view of a switched flux permanent magnet linear motor;
FIG. 4 is an axial side view of a switched flux permanent magnet linear motor;
FIG. 5 is an overall central axial cross-sectional view of a switched flux permanent magnet machine;
fig. 6 is an overall radial cross-sectional view of a switched flux permanent magnet machine.
Wherein: 1. a mold driving disk; 2. a switching flux permanent magnet linear motor; 3. a primary core; 4. an armature winding; 5. a permanent magnet; 6. a secondary mover core; 7. a primary stator bottom plate; 8. a guide rail slider pair; 9. an iron core pressing plate; 10. a stator connecting plate; 11. a grating position sensor; 12. a switched flux permanent magnet machine; 13. a drive shaft; 14. a rotor core; 15. a stator core; 16. magnetic steel; 17. a motor winding; 18. a motor base; 19. a motor cover; 20. a ball bearing; 21. positioning the snap ring; 22. a bearing end cap; 23. a reluctance resolver.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a direct-drive mechanism of a radial plastic forming die, which is characterized in that four switching flux permanent magnet linear motors which are coaxially and symmetrically arranged on a die driving disc respectively drive four dies to do radial reciprocating motion, and the switching flux permanent magnet motors directly drive the die driving disc to rotate. The whole structure of the equipment is simplified and simple by a direct driving mode, and the running precision is improved; the structure robustness of the rotary driving shaft and the die feeding shaft is strong by adopting the switching flux motor, and the dynamic response speed and the impact load resistance capability are favorably improved. In addition, the number of the radially fed dies and the driving motors thereof can be configured according to the process requirements, so that the multifunctional plastic forming process is realized.
Referring to fig. 1, the direct drive mechanism for the radial plastic forming die of the present invention includes a die driving disc 1, a switching flux permanent magnet linear motor 2, a switching flux permanent magnet motor 12, and a motor base 18.
The mold driving disc 1 is used for installing the switch magnetic flux permanent magnet linear motor 2, the mold is directly installed at the front end of the mold driving disc close to the secondary rotor of the switch magnetic flux permanent magnet linear motor 2, the switch magnetic flux permanent magnet linear motor 2 directly drives the mold to feed in the radial direction, and a plurality of switch magnetic flux permanent magnet linear motors 2 can respectively drive a plurality of molds to feed in the radial direction simultaneously to achieve different radial plastic forming processes.
The switching flux permanent magnet motor 12 is arranged on the rear side of the mold driving disc 1 and used for directly driving the mold driving disc 1 to rotate so as to realize the rotation of the mold.
Referring to fig. 2, a plurality of switching flux permanent magnet linear motors 2 are radially arranged on a mold driving disc 1, and the number of the switching flux permanent magnet linear motors 2 is 4, and the switching flux permanent magnet linear motors are symmetrically arranged on the mold driving disc 1 at intervals along the circumferential direction.
Referring to fig. 3, the switching flux permanent magnet linear motor 2 has a double-primary stator single-stage mover structure, and each primary stator includes a primary iron core 3, an armature winding 4, and a permanent magnet 5; the secondary rotor iron core 6 is of a double-sided salient pole type structure, and the secondary rotor iron core 6 is arranged on the inner side between the two primary stators.
Referring to fig. 3, the primary stator is disposed on a primary stator bottom plate 7, the primary iron core 3 is in a U-shaped tooth arrangement structure, the permanent magnets 5 are disposed between the U-shaped teeth at intervals, and the armature windings 4 are wound in the form of spaced windings in two adjacent U-shaped tooth slots at intervals. A pair of primary cores 3 are fixed to a primary stator base plate 7 at a certain interval by a core presser 9. The primary stator base plate 7 is fixed to the mold drive disk 1.
Referring to fig. 4, two lateral sides of the secondary rotor core 6 are respectively provided with a guide rail slider pair 8, and the two guide rail slider pairs 8 are respectively connected with the mold driving disk 1 and the stator connecting plate 10. Two sides of the stator connecting plate 10 are respectively connected with the two primary stator bottom plates 7. A grating position sensor 11 is arranged between one transverse side of the secondary rotor core 6 and the stator connecting plate 10.
Referring to fig. 5 and 6, the switching flux permanent magnet motor 12 is disposed in the motor base 18, the switching flux permanent magnet motor 12 includes a driving shaft 13, a rotor core 14, a stator core 15, magnetic steel 16 and a motor winding 17, and the mold driving disk 1 is disposed at the front end of the driving shaft 13.
Referring to fig. 5, the rotor core 14 is fitted around the outer circle of the driving shaft 13, and the front and rear ends of the rotor core 14 are provided with a positioning snap ring 21, a ball bearing 20, and a bearing end cap 22. The ball bearing 20 is connected with the motor end cover 19, and the motor end cover 19 is arranged at the front end and the rear end of the motor base 18. A reluctance resolver 23 is provided between the motor cover 19 and the bearing end cover 22 at the rear end of the motor base 18.
Referring to fig. 6, the rotor core 14 is a salient pole type structure, the outer circle of the rotor core 14 is circumferentially provided with U-shaped stator cores 15, the stator cores 15 are circumferentially arranged on the inner circle of the motor base 18, the magnetic steel 16 is embedded between two adjacent stator cores 15, and the stator winding 17 is wound across the tooth grooves of two adjacent stator cores 15 in a concentrated winding manner.
In summary, the plurality of dies are directly driven by the plurality of switching flux linear motors to independently perform radial reciprocating motion, and the die mounting disc is directly driven by the switching flux permanent magnet motor to realize the rotary driving of the dies. The direct driving mode ensures that the whole structure of the equipment is simple and compact and the control precision is high. And the two motors both adopt a switching magnetic flux topological structure, so that the dynamic response of the driving moving part is fast, the robustness is strong, and the motor is particularly suitable for resisting impact load during plastic forming. In addition, the rotary and linear driving structure is flexible, and the device is suitable for multi-degree-of-freedom expansion, so that the device can be applied to radial plastic forming processes with different functional requirements.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. A direct-drive mechanism of a radial plastic forming die is characterized by comprising a die driving disc (1), wherein the die driving disc (1) is arranged at the front end of a driving shaft (13) of a switching flux permanent magnet motor (12), 4 switching flux permanent magnet linear motors (2) are arranged on the die driving disc (1) in the radial direction, and the 4 switching flux permanent magnet linear motors (2) are symmetrically arranged along the circumferential direction of the die driving disc (1) at intervals and are used for driving the die to do radial reciprocating motion; the switched flux permanent magnet motor (12) is disposed within a motor housing (18).
2. The direct-drive mechanism of the radial plastic forming die as claimed in claim 1, wherein the switching flux permanent magnet linear motor (2) is in a double-primary-stator single-secondary-rotor structure, a secondary rotor core (6) is arranged between the two primary stators, and the secondary rotor core (6) is in a double-sided salient pole type structure.
3. The direct-drive mechanism of the radial plastic forming die as claimed in claim 2, wherein the primary stator is arranged on a primary stator bottom plate (7) and fixed on the die driving disc (1) through the primary stator bottom plate (7), the mechanism comprises a plurality of primary iron cores (3), the primary iron cores (3) are in a U-shaped tooth arrangement structure, permanent magnets (5) are arranged between U-shaped teeth at intervals, and armature windings (4) are wound in two adjacent U-shaped tooth grooves at intervals in a spaced winding mode.
4. The direct drive mechanism of the radial plastic forming die as claimed in claim 3, characterized in that each pair of primary cores (3) is fixed on the primary stator bottom plate (7) at intervals by a core pressing plate (9).
5. The direct drive mechanism of the radial plastic forming die according to claim 2, wherein two guide rail slider pairs (8) are respectively arranged on two transverse sides of the secondary rotor core (6), the guide rail slider pairs (8) are respectively connected with the die driving disc (1) and the stator connecting plate (10), and two sides of the stator connecting plate (10) are respectively connected with the two primary stator bottom plates (7).
6. The direct drive mechanism of the radial plastic forming die as claimed in claim 5, wherein a grating position sensor (11) is arranged between one lateral side of the secondary rotor core (6) and the stator connecting plate (10).
7. The direct-drive mechanism of the radial plastic forming die as claimed in claim 1, wherein the switching flux permanent magnet motor (12) comprises a rotor core (14), the rotor core (14) is sleeved on the outer circle of the driving shaft (13), the front end and the rear end of the rotor core (14) are respectively provided with a positioning snap ring (21), a ball bearing (20) and a bearing end cover (22), and the ball bearing (20) is connected with motor end covers (19) arranged at the front end and the rear end of the motor base (18).
8. The direct drive mechanism of the radial plastic forming die of claim 7, characterized in that the rotor core (14) is in a salient pole type structure, and a reluctance resolver (23) is arranged between a motor cover (19) and a bearing end cover (22) at the rear end of a motor base (18).
9. The direct-drive mechanism of the radial plastic forming die as claimed in claim 7, wherein the outer circle of the rotor core (14) is circumferentially provided with a U-shaped stator core (15), the stator cores (15) are circumferentially arranged on the inner circle of the motor base (18), magnetic steel (16) is arranged between two adjacent stator cores (15), and a stator winding (17) is spanned in the tooth slot of two adjacent stator cores (15) in a concentrated winding manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911292955.8A CN110994856A (en) | 2019-12-16 | 2019-12-16 | Direct drive mechanism of radial plastic forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911292955.8A CN110994856A (en) | 2019-12-16 | 2019-12-16 | Direct drive mechanism of radial plastic forming die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110994856A true CN110994856A (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911292955.8A Pending CN110994856A (en) | 2019-12-16 | 2019-12-16 | Direct drive mechanism of radial plastic forming die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110994856A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115246203A (en) * | 2022-07-21 | 2022-10-28 | 博创智能装备股份有限公司 | Novel electronic platform device that penetrates |
| CN115922365A (en) * | 2022-11-28 | 2023-04-07 | 西安电子科技大学 | Salient pole magnetic flux combined type electromagnetic module X-Y-R working platform |
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| AT504045A1 (en) * | 2006-05-31 | 2008-02-15 | Gfm Beteiligungs & Man Gmbh | DEVICE FOR RADIAL FORGING A WORKPIECE |
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| CN105915016A (en) * | 2016-06-03 | 2016-08-31 | 西安电子科技大学 | Multi-surface cylinder type hybrid excitation switch magnetic flux linear motor |
| CN105932853A (en) * | 2016-06-14 | 2016-09-07 | 西安电子科技大学 | Permanent magnet linear oscillation motor with stator |
| CN207884431U (en) * | 2018-03-09 | 2018-09-18 | 西安工业大学 | A kind of air supporting straight-line electric rail module assembly apparatus |
| CN109787448A (en) * | 2019-03-05 | 2019-05-21 | 西安电子科技大学 | A kind of primary permanent magnet linear motor actuator |
| CN109861412A (en) * | 2019-02-14 | 2019-06-07 | 江苏大学 | Permanent magnetism top rake formula bearing-free flux switch permanent magnet motor |
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2019
- 2019-12-16 CN CN201911292955.8A patent/CN110994856A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT504045A1 (en) * | 2006-05-31 | 2008-02-15 | Gfm Beteiligungs & Man Gmbh | DEVICE FOR RADIAL FORGING A WORKPIECE |
| CN101860158A (en) * | 2010-05-18 | 2010-10-13 | 哈尔滨工业大学 | Switch magnetic flow permanent magnet synchronous motor |
| CN105915016A (en) * | 2016-06-03 | 2016-08-31 | 西安电子科技大学 | Multi-surface cylinder type hybrid excitation switch magnetic flux linear motor |
| CN105932853A (en) * | 2016-06-14 | 2016-09-07 | 西安电子科技大学 | Permanent magnet linear oscillation motor with stator |
| CN207884431U (en) * | 2018-03-09 | 2018-09-18 | 西安工业大学 | A kind of air supporting straight-line electric rail module assembly apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115246203A (en) * | 2022-07-21 | 2022-10-28 | 博创智能装备股份有限公司 | Novel electronic platform device that penetrates |
| CN115922365A (en) * | 2022-11-28 | 2023-04-07 | 西安电子科技大学 | Salient pole magnetic flux combined type electromagnetic module X-Y-R working platform |
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Application publication date: 20200410 |
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