CN114589543B - Sensor protection system for positioning cutter compensation - Google Patents
Sensor protection system for positioning cutter compensation Download PDFInfo
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- CN114589543B CN114589543B CN202210299286.2A CN202210299286A CN114589543B CN 114589543 B CN114589543 B CN 114589543B CN 202210299286 A CN202210299286 A CN 202210299286A CN 114589543 B CN114589543 B CN 114589543B
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- sensor
- fixedly connected
- cavity
- driving source
- storage cavity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
- B23Q15/007—Automatic control or regulation of feed movement, cutting velocity or position of tool or work while the tool acts upon the workpiece
- B23Q15/16—Compensation for wear of the tool
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a sensor protection system for positioning cutter compensation, which relates to the technical field of sensor protection and comprises an extension frame, wherein a storage cavity is formed in the extension frame, the sensor protection system also comprises a driving mechanism used for driving the sensor to reciprocate and shake after being retracted into the storage cavity, the driving mechanism comprises a rotary driving source, a driving shaft of the rotary driving source is fixedly connected with a straight-tooth gear, a cavity is formed in the extension frame, the side surface of the sensor is fixedly connected with a connecting rod, the side surface of the extension frame is provided with a sliding opening used for the sensor to penetrate through and be in sliding connection with the sensor, the side surface of the connecting rod is fixedly connected with a tooth block, and the side surface of the tooth block is fixedly connected with a fixed rod. The sensor can be retracted into the storage cavity for protection, and the sensor can shake back and forth after the sensor is retracted, so that broken slag remained on the surface of the sensor can be shaken off, and the pollution or damage to the sensor is further avoided.
Description
Technical Field
The invention relates to the technical field of sensor protection, in particular to a sensor protection system for positioning cutter compensation.
Background
The abrasion of the tool changes the position of the tool relative to the workpiece, which affects the quality of the processed workpiece, so that the abrasion amount of the tool needs to be monitored in time and the position of the tool needs to be adjusted and compensated in time.
An external active compensation method and device for axial runout of a rotary spindle tool, as disclosed in chinese patent CN01134648.5, japanese 20020508, wherein the external active compensation device is independent of the spindle, and comprises: the device comprises a sensor, an extension frame, a plurality of actuators and a control module. The extending frame extends between a base and a position close to the cutter, and the sensor is combined at the tail end of the extending frame and corresponds to the cutter. The actuator is arranged between the outer part of the main shaft and the base and can drive the whole main shaft to carry out micro axial displacement motion relative to the base. The control module receives the axial deflection displacement of the tool transmitted by the sensor and controls the micro-feeding amount of the actuator according to the axial deflection displacement, so that the whole spindle device and the tool are driven to perform micro axial compensation displacement.
However, the cited document does not provide a protective member for the sensor, which is exposed to the harsh processing environment, so that the sensor is contaminated or even damaged by processing debris, resulting in a decrease in its accuracy.
Disclosure of Invention
The invention aims to provide a sensor protection system for positioning cutter compensation, which is provided with a sensor which can be retracted into a storage cavity for protection, and can shake back and forth after the sensor is retracted, so that broken slag remained on the surface of the sensor can be shaken off, the sensor is further prevented from being polluted or damaged, and the problem that the precision of the sensor is reduced because the sensor is exposed to a severe processing environment due to the fact that a protection part is not arranged on the sensor in the prior art is solved.
In order to achieve the purpose, the invention provides the following technical scheme: a sensor protection device for positioning cutter compensation comprises an extension frame, wherein a storage cavity is formed in the extension frame;
the device also comprises a driving mechanism which is used for driving the sensor to reciprocate and shake after the sensor is retracted into the storage cavity.
Preferably, actuating mechanism is including rotating the driving source, the drive shaft fixedly connected with straight-tooth gear of driving source rotates, the cavity has been seted up to the inside of extension frame, it is in to rotate driving source fixed connection the chamber wall of cavity, the side fixedly connected with connecting rod of sensor, the side of extension frame is offered and is used for the sensor penetrates and sliding connection's smooth mouth with it, the side fixedly connected with tooth piece of connecting rod, the side fixedly connected with dead lever of tooth piece, the rack board has been cup jointed on the surface of dead lever, the surface cover of dead lever is equipped with spring one, the both ends of spring one respectively with the side of rack board with the side fixed connection of tooth piece.
Preferably, the sensor storage device further comprises a shielding plate for shielding the storage cavity, an opening is formed in the side face of the shielding plate, the sensor storage device further comprises a transmission mechanism, and after the sensor is retracted into the storage cavity, the driving shaft of the rotary driving source continues to operate, and the shielding plate is driven to rotate under the action of the transmission mechanism.
Preferably, drive mechanism includes the integral key shaft, the left side of integral key shaft with the side fixed connection of shielding plate, the side of extending the frame is offered and is used for the integral key shaft penetrates and rotates the through-hole of being connected with it one, the external splines portion splined connection of integral key shaft has the spline housing, the right side fixedly connected with conical gear one of spline housing, the drive shaft fixedly connected with conical gear two of rotation driving source, the spacing arm of chamber wall fixedly connected with of cavity, the cover block has been cup jointed on the surface of spacing arm, the left end of cover block with the right-hand member of conical gear one rotates the connection, the lower fixed surface of cover block is connected with suppresses the piece one, the last fixed surface of connecting rod is connected with suppresses piece two, still including being used for the spline housing is to keeping away from the canceling release mechanical system that conical gear two reset.
Preferably, the reset mechanism comprises a second spring, and two end parts of the second spring are fixedly connected with the cavity wall of the cavity and the left side of the spline housing respectively.
Preferably, the cavity wall of the storage cavity is fixedly connected with a filter screen.
Preferably, a second through hole communicated with each other is formed between the storage cavity and the cavity, a knocking rod is connected to the hole wall of the second through hole in a sliding mode, a third pressing block is fixedly connected to the upper surface of the knocking rod, and a third spring is fixedly connected between the side face of the third pressing block and the cavity wall of the cavity.
Preferably, the rotation driving source is a servo motor.
The invention provides the following protection methods: a method of protecting a sensor protection device for positioning tool compensation, comprising the steps of:
s1: when in protection, the sensor is driven to be retracted into the storage cavity through the driving mechanism;
s2: with the continuous operation of the driving mechanism, the sensor is driven to shake back and forth so as to shake off the broken slag remained on the surface of the sensor.
Compared with the prior art, the invention has the following beneficial effects:
1. the sensor can be driven to be retracted into the storage cavity and to be in the state shown in figure 2 by the operation of the rotary driving source, so that slag generated by processing is prevented from polluting or damaging the sensor, and the sensor is protected.
2. The invention can drive the sensor to shake back and forth after being retracted into the storage cavity through the continuous operation of the rotary driving source, thereby shaking off the broken slag remained on the surface of the sensor and further avoiding the pollution or the damage to the sensor.
3. The invention can make the opening misplace at the cavity opening of the storage cavity by the continuous operation of the rotary driving source, thereby further avoiding the crushed slag from entering the storage cavity to pollute or damage the sensor.
4. According to the invention, through the continuous operation of the rotary driving source, the beating rod can continuously beat the filter screen, so that the filter screen generates vibration, and the phenomenon that the broken slag shaken off from the surface of the sensor blocks the meshes of the filter screen is avoided.
Drawings
FIG. 1 is a first state diagram of the structure of the present invention and is taken as a front view;
FIG. 2 is a second state diagram of the structure of the present invention;
FIG. 3 is a third state diagram of the structure of the present invention;
figure 4 is a side view of the spacing arm and nest block configuration of the present invention.
In the figure: 1-extension frame, 2-storage cavity, 3-sensor, 4-rotation driving source, 5-straight-tooth gear, 6-cavity, 7-connecting rod, 8-tooth block, 9-fixing rod, 10-rack plate, 11-spring I, 12-baffle plate, 13-opening, 14-spline shaft, 15-spline housing, 16-conical gear I, 17-conical gear II, 18-limiting arm, 19-sleeve block, 20-pressing block I, 21-pressing block II, 22-spring II, 23-filter screen, 24-knocking rod, 25-pressing block III and 26-spring III.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, the present invention provides a technical solution: the utility model provides a sensor protective equipment for location cutter compensation, is including extending frame 1, the inside of extending frame 1 has been seted up and has been deposited chamber 2, still including being used for driving sensor 3 retrieve extremely deposit 2 interior backs, the actuating mechanism of reciprocal shake, when the protection, through actuating mechanism, drive sensor 3 retrieve to depositing 2 interior and to the state shown in figure 2 of chamber, the disintegrating slag that has then prevented processing production pollutes or damages sensor 3, has played the effect of protection to sensor 3 to retrieve to depositing 2 interior backs at sensor 3, can reciprocate the shake, thereby can shake the disintegrating slag that remains on sensor 3 surface and fall, further avoided polluting or damaging sensor 3.
Further, the driving mechanism comprises a rotating driving source 4, a driving shaft of the rotating driving source 4 is fixedly connected with a straight-tooth gear 5, a cavity 6 is formed in the extending frame 1, the rotating driving source 4 is fixedly connected to the cavity wall of the cavity 6, a connecting rod 7 is fixedly connected to the side surface of the sensor 3, a sliding opening used for the sensor 3 to penetrate and to be in sliding connection with the extending frame 1 is formed in the side surface of the extending frame 1, a tooth block 8 is fixedly connected to the side surface of the connecting rod 7, a fixing rod 9 is fixedly connected to the side surface of the tooth block 8, a rack plate 10 is sleeved on the surface of the fixing rod 9, a first spring 11 is sleeved on the surface of the fixing rod 9, two end portions of the first spring 11 are respectively fixedly connected to the side surface of the rack plate 10 and the side surface of the tooth block 8, starting from the state shown in fig. 1, the straight-tooth gear 5 is driven to rotate by rotating the driving source 4, the straight-tooth gear 5 rotates counterclockwise, the rack plate 10 is driven to move rightwards by moving the rack plate 10 rightwards, the connecting rod 7 is driven to move rightwards, and the sensor 3 is retracted into the storage cavity 2 and reaches the state shown in fig. 2; after the state shown in the motion figure 2, the straight-tooth gear 5 is driven to continue to rotate anticlockwise through the rotation driving source 4, the straight-tooth gear 5 rotates anticlockwise and is driven to drive the tooth block 8 to reciprocate through the elastic force provided by the first spring 11 when the straight-tooth gear 5 is intermittently abutted against the tooth block 8, the connecting rod 7 is driven to reciprocate through the tooth block 8, and the sensor 3 can be driven to retract to the storage cavity 2 and then shake in a reciprocating mode through the connecting rod 7 to reciprocate through the connecting rod 7.
Further, still include and be used for sheltering from deposit the chamber 2 shielding plate 12, opening 13 has been seted up to the side of shielding plate 12, still include drive mechanism, after sensor 3 withdrawed to deposit in the chamber 2, through the continuation operation of rotation driving source 4 drive shaft, and under drive mechanism's effect, drive shielding plate 12 is rotatory.
Further, the transmission mechanism comprises a spline shaft 14, the left side of the spline shaft 14 is fixedly connected with the side face of the baffle plate 12, a first through hole used for the spline shaft 14 to penetrate and be rotatably connected with the side face of the extension frame 1 is formed in the side face of the extension frame 1, a spline sleeve 15 is connected with an external spline part of the spline shaft 14 through a spline, a first conical gear 16 is fixedly connected to the right side of the spline sleeve 15, a second conical gear 17 is fixedly connected with a driving shaft of the rotating driving source 4, a limiting arm 18 is fixedly connected with the cavity wall of the cavity 6, a sleeve block 19 is sleeved on the surface of the limiting arm 18, the left end of the sleeve block 19 is rotatably connected with the right end of the first conical gear 16 through a bearing, the sleeve block 19 and the first conical gear 16 are rotatably connected through a bearing, the sleeve block 19 and the first conical gear 16 can rotate relatively without interference, and the sleeve block 19 can drive the first conical gear 16 to reciprocate, the lower surface of the sleeve block 19 is fixedly connected with a first pressing block 20, the upper surface of the connecting rod 7 is fixedly connected with a second pressing block 21, the resetting mechanism is used for resetting the spline sleeve 15 to a position far away from the second conical gear 17, the second pressing block 21 is driven to reciprocate through the reciprocating movement of the connecting rod 7, the first intermittent pressing block 20 is pressed through the reciprocating movement of the second pressing block 21, in the process, the sleeve block 19 can be driven to reciprocate along the surface of the limiting arm 18 through the resetting force provided by the resetting mechanism, the first conical gear 16 is driven to reciprocate through the reciprocating movement of the sleeve block 19, the first conical gear 16 is driven to be meshed with the second conical gear 17 intermittently through the reciprocating movement of the first conical gear 16, the spline sleeve 15 is driven to rotate, and the shielding plate 12 is driven to rotate through the rotation of the spline sleeve 15 and the spline fit between the spline shaft 14, so that opening 13 misplaces in the accent of depositing chamber 2, and then has further avoided the disintegrating slag to enter into depositing in the chamber 2, pollute or damage sensor 3, when reusing sensor 3, also can rotate through shielding plate 12, so that opening 13 aligns in the accent of depositing chamber 2, so that when spur gear 5 clockwise rotates, can take sensor 3 out and deposit chamber 2 and pass opening 13, use.
Further, the resetting mechanism comprises a second spring 22, and two end parts of the second spring 22 are fixedly connected with the cavity wall of the cavity 6 and the left side of the spline housing 15 respectively.
Further, deposit the chamber wall fixedly connected with filter screen 23 of chamber 2, through the filter screen 23 that sets up, can avoid the impurity in the air to enter into to the intracavity of depositing chamber 2 by the lower chamber mouth of depositing chamber 2, and then pollute sensor 3.
Furthermore, a through hole II which is communicated with each other is formed between the storage cavity 2 and the cavity 6, a knocking rod 24 is connected to the hole wall of the through hole II in a sliding mode, a pressing block III 25 is fixedly connected to the upper surface of the knocking rod 24, a spring III 26 is fixedly connected between the side face of the pressing block III 25 and the cavity wall of the cavity 6, the pressing block III 25 is pressed intermittently through reciprocating movement of the tooth block 8, the filter screen 23 can be continuously knocked by the knocking rod 24 through elastic force provided by the spring III 26 in the process, vibration is generated in the filter screen 23, and the situation that the meshes of the filter screen 23 are blocked by the detritus shaken off from the surface of the sensor 3 is avoided.
Further, the rotation drive source 4 is a servo motor.
Referring to fig. 1 to 4, the present invention provides a protection method: a method of protecting a sensor protection device for positional tool compensation, comprising the steps of:
s1: when in protection, the sensor 3 is driven to be retracted into the storage cavity 2 through the driving mechanism;
s2: with the continuous operation of the driving mechanism, the sensor 3 is driven to shake back and forth, so that the broken slag remained on the surface of the sensor 3 is shaken off.
The working principle is as follows: when the sensor protection device for positioning tool compensation is used for protection, starting from the state shown in fig. 1, the straight-tooth gear 5 is driven to rotate anticlockwise by rotating the driving source 4, the rack plate 10 is driven to move rightwards by the anticlockwise rotation of the straight-tooth gear 5, the connecting rod 7 is driven to move rightwards by the right movement of the rack plate 10, the sensor 3 is driven to be retracted into the storage cavity 2 and to reach the state shown in fig. 2 by the right movement of the connecting rod 7, and therefore, slag generated by processing is prevented from polluting or damaging the sensor 3, and the sensor 3 is protected;
after the state shown in the motion figure 2, the straight-tooth gear 5 is driven to continue to rotate anticlockwise by rotating the driving source 4, the straight-tooth gear 5 drives the tooth block 8 to reciprocate when being intermittently pressed against the tooth block 8 by the anticlockwise rotation of the straight-tooth gear 5 and the elastic force provided by the spring I11, the tooth block 8 drives the connecting rod 7 to reciprocate by the reciprocating motion of the tooth block 8, and the sensor 3 is driven to retract into the storage cavity 2 by the reciprocating motion of the connecting rod 7 and then reciprocates and shakes, so that broken slag remained on the surface of the sensor 3 can be shaken off, and the sensor 3 is further prevented from being polluted or damaged;
the connecting rod 7 reciprocates to drive the two pressing blocks 21 to reciprocate, the two pressing blocks 21 reciprocate to drive the sleeve block 19 to reciprocate along the surface of the limiting arm 18, the sleeve block 19 reciprocates to drive the first conical gear 16 to reciprocate, the first conical gear 16 reciprocates to enable the first conical gear 16 to intermittently mesh with the second conical gear 17 for transmission, then the spline sleeve 15 is driven to rotate, the spline sleeve 15 rotates and is matched with a spline between the spline shafts 14 to drive the baffle plate 12 to rotate, so that the opening 13 is staggered at the cavity opening of the storage cavity 2, further, crushed slag is prevented from entering the storage cavity 2 to pollute or damage the sensor 3, when the sensor 3 is reused, the baffle plate 12 can also rotate to enable the opening 13 to be aligned at the cavity opening of the storage cavity 2, and when the straight-tooth gear 5 rotates clockwise, the sensor 3 can be taken out of the storage cavity 2 and pass through the opening 13 to be used;
through the reciprocating movement of the tooth block 8, the discontinuous abutting block III 25 is pressed, in the process, the knocking rod 24 can knock the filter screen 23 continuously through the elastic force provided by the spring III 26, so that the filter screen 23 vibrates, and the phenomenon that the crushed slag shaken off from the surface of the sensor 3 blocks meshes of the filter screen 23 is avoided.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. Sensor protection device for positioning tool compensation, comprising an extension frame (1), characterized in that: a storage cavity (2) is formed in the extension frame (1);
the device also comprises a driving mechanism which is used for driving the sensor (3) to shake back and forth after being retracted into the storage cavity (2); the driving mechanism comprises a rotary driving source (4), and a straight-tooth gear (5) is fixedly connected with a driving shaft of the rotary driving source (4);
a cavity (6) is formed in the extension frame (1), and the rotary driving source (4) is fixedly connected to the cavity wall of the cavity (6);
a connecting rod (7) is fixedly connected to the side surface of the sensor (3), and a sliding opening for the sensor (3) to penetrate through and be in sliding connection with is formed in the side surface of the extension frame (1);
the side surface of the connecting rod (7) is fixedly connected with a tooth block (8), the side surface of the tooth block (8) is fixedly connected with a fixing rod (9), a rack plate (10) is sleeved on the surface of the fixing rod (9), a first spring (11) is sleeved on the surface of the fixing rod (9), two end parts of the first spring (11) are respectively and fixedly connected with the side surface of the rack plate (10) and the side surface of the tooth block (8), the storage device further comprises a shielding plate (12) used for shielding the storage cavity (2), and an opening (13) is formed in the side surface of the shielding plate (12);
still include drive mechanism sensor (3) withdraw extremely deposit back in the chamber (2), through the continuation function of rotation driving source (4) drive shaft, and under drive mechanism's effect, drive shielding plate (12) are rotatory, drive mechanism includes integral key shaft (14), the left side of integral key shaft (14) with the side fixed connection of shielding plate (12), the side of extending frame (1) is offered and is used for integral key shaft (14) penetrate and rotate the through-hole of being connected with it one, the external splines portion splined connection of integral key shaft (14) has spline housing (15), the right side fixedly connected with conical gear one (16) of spline housing (15), the drive shaft fixedly connected with conical gear two (17) of rotation driving source (4), the chamber wall fixedly connected with spacing arm (18) of cavity (6), the surface of spacing arm (18) has cup jointed cover piece (19), the left end of cover piece (19) with the right-hand member rotation of conical gear one (16) is connected, the lower surface fixedly connected with of cover piece (19) supports briquetting (20), connecting rod (7) fixed pressing block (7) still include two briquetting (17) that reset mechanism reset to last briquetting (17) are used for.
2. The sensor protection apparatus for positional tool compensation of claim 1, wherein: the resetting mechanism comprises a second spring (22), and two end parts of the second spring (22) are fixedly connected with the cavity wall of the cavity (6) and the left side of the spline sleeve (15) respectively.
3. Sensor protection device for positioning tool compensation according to claim 1 or 2, characterized in that: and a filter screen (23) is fixedly connected to the cavity wall of the storage cavity (2).
4. The sensor protection apparatus for positional tool compensation of claim 3, wherein: a second through hole communicated with each other is formed between the storage cavity (2) and the cavity (6), the hole wall of the second through hole is connected with a knocking rod (24) in a sliding mode, the upper surface of the knocking rod (24) is fixedly connected with a third pressing block (25), and a third spring (26) is fixedly connected between the side face of the third pressing block (25) and the cavity wall of the cavity (6) together.
5. The sensor protection apparatus for positional tool compensation of claim 4, wherein: the rotary driving source (4) is a servo motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210299286.2A CN114589543B (en) | 2022-03-25 | 2022-03-25 | Sensor protection system for positioning cutter compensation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210299286.2A CN114589543B (en) | 2022-03-25 | 2022-03-25 | Sensor protection system for positioning cutter compensation |
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| CN114589543A CN114589543A (en) | 2022-06-07 |
| CN114589543B true CN114589543B (en) | 2022-12-27 |
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| US20210402539A1 (en) * | 2014-08-15 | 2021-12-30 | Baron Investments, Llc | Data collection, transfer and feedback in working tools |
| CN108673318B (en) * | 2018-05-22 | 2020-06-05 | 日照胜达机械股份有限公司 | Efficient rust removing device for surface of steel plate for machining |
| CN212133895U (en) * | 2020-06-24 | 2020-12-11 | 大连东热科技有限公司 | Temperature detection device |
| CN212677289U (en) * | 2020-09-18 | 2021-03-09 | 张家港保税区华瑞管道检测有限公司 | Image display device for sewage pipeline detection |
| CN112934730B (en) * | 2021-04-01 | 2022-11-29 | 重庆联科印务有限公司 | Formed product quantitative racking machine for handbag processing and use method thereof |
| CN215032686U (en) * | 2021-06-10 | 2021-12-07 | 咸阳本一冲压技术有限公司 | Automatic collect punching machine of punching press clout |
| CN215393892U (en) * | 2021-07-13 | 2022-01-04 | 江苏建筑职业技术学院 | Direction-adjustable mechanical clamp for machining |
| CN113604842A (en) * | 2021-08-04 | 2021-11-05 | 广西国宸稀土金属材料有限公司 | Rare earth metal electrolysis intelligent feeding system and use method thereof |
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