CN104440440A - Pneumatic straight line reciprocation-type grinding machine and using method thereof - Google Patents
Pneumatic straight line reciprocation-type grinding machine and using method thereof Download PDFInfo
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- CN104440440A CN104440440A CN201410790996.0A CN201410790996A CN104440440A CN 104440440 A CN104440440 A CN 104440440A CN 201410790996 A CN201410790996 A CN 201410790996A CN 104440440 A CN104440440 A CN 104440440A
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- spool
- hole
- valve pocket
- piston
- sand paper
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
- B24B7/10—Single-purpose machines or devices
- B24B7/18—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention relates to a pneumatic straight line reciprocation-type grinding machine and a using method of the pneumatic straight line reciprocation-type grinding machine. The grinding machine is characterized by comprising an abrasive paper clamping plate and a body arranged on the abrasive paper clamping plate, two piston rods extend out of the body and move in the same direction in a telescopic reciprocation mode, and the free ends of the two piston rods are fixed to two supporting bases of the abrasive paper clamping plate respectively. The pneumatic straight line reciprocation type grinding machine can achieve the trace effect of manual grinding, and avoids threads with circles caused by grinding of a rotary grinding machine.
Description
technical field:
The present invention relates to a kind of pneumatic linear reciprocating sander and using method thereof.
background technology:
The object of polishing makes body surface more smooth, at present in the grinding process of most of irregular surface or metope substantially by manually polishing, although it is effective to polish, but grinding efficiency is low, and sand paper use amount is larger; And some the mechanical grinding machines occurred at present are rotary sander, be not suitable for the polishing of many irregular surfaces, and due to its polishing track be circular, easily form uneven circle shape polishing vestige on polishing surface, effect is undesirable, and the sand paper that rotary sander adopts is necessary for the sand paper of back flocking, use cost is high.
summary of the invention:
The object of the present invention is to provide a kind of pneumatic linear reciprocating sander and using method thereof, this sander structure is simple, reasonable in design, is conducive to realizing the polishing of high efficiency linear reciprocation.
The pneumatic linear reciprocating sander of the present invention, it is characterized in that: comprise sand paper clamping plate and be located at the main body on sand paper clamping plate, described main body is stretched out the piston rod of two reciprocal stretching motions in the same way, the free end of two-piston bar is separately fixed on two supporting seats of sand paper clamping plate.
Further, the bottom surface of aforementioned body is provided with several rollers and is resisted against on the upper surface of sand paper clamping plate.
Further, above-mentioned sand paper clamping plate both side ends is provided with V-type groove, and V-type groove has been installed with V-type compressing tablet, described V-type compressing tablet is locked on sand paper clamping plate by wing nut.
Further, aforementioned body sidepiece is fixedly connected with curved rod, and curved rod is connected with extensible gripping handle, and described gripping handle central part is equipped with sweep-up pipe, and described sweep-up pipe stretches into the cover cap be located in main body.
Further, aforementioned body comprises the housing anyhow passed through mutually, vertically fixedly be located at the valve pocket in housing and the horizontal chamber cover being fixedly located at valve pocket both sides, the spool that can slide in its body is provided with in described valve sleeve body, described two-piston bar is provided with in the cover of described chamber, the medial extremity of described two-piston bar is equipped with piston, described spool is cylinder, be provided with that three sections of outer surfaces and valve pocket inner surface match on the cylinder first, second, 3rd annular piston, be provided with in spool two be parallel to each other first, second counterbore, first counterbore extends to described second from spool first end toward the second end, between 3rd annular piston, and with second, arrange the first perforation between 3rd annular piston to communicate, second counterbore extends to described first from spool second end toward first end, between second annular piston, and with first, arrange the second perforation between second annular piston to communicate, described valve pocket is cylindrical shroud, its center section part is provided with the first through hole, be positioned at valve pocket both ends circumference and be all evenly equipped with four left and right second through holes, valve pocket is provided with two third through-holes between the first through hole and the second through hole, the third through-hole axial line conllinear on each two of both sides, the first plane that this two axial line is formed and the first through hole axial line perpendicular, have the axial line of four through holes to be positioned in the first plane in the second through hole.
Further, spring is provided with between above-mentioned two-piston and valve pocket outer surface.
Further, above-mentioned valve pocket surface is positioned at the second through hole, third through-hole position is provided with undergauge, the third through-hole of side and the chamber on the left side are overlapped outer surface and are connected, the chamber cover outer surface on this left side is through with left side piston outboard end cavity again, the third through-hole of opposite side and the chamber on the right are overlapped outer surface and are connected, and the chamber cover outer surface on the right of this is through with the right piston outboard end cavity again.
Further, above-mentioned left side piston outboard end cavity and the right piston outboard end cavity all have damping ring and end cap shutoff, and all there are airtight axle and the shutoff of O type circle in valve pocket two ends.
The using method of the pneumatic linear reciprocating sander of the present invention, it is characterized in that: described pneumatic linear reciprocating sander comprises sand paper clamping plate and is located at the main body on sand paper clamping plate, described main body is stretched out the piston rod of two reciprocal stretching motions in the same way, the free end of two-piston bar is separately fixed on two supporting seats of sand paper clamping plate, during use, user is hand-held fixing or by rod member stationary body outer surface, piston rod is reciprocal stretching motion in the same way under external force, drive the sand paper linear reciprocating motion of sand paper clamping plate and upper clamping thereof, realize sand paper straight line polishing body surface.
The present invention's pneumatic linear reciprocating sander advantage:
1) linear reciprocating polishing, multiple irregular surface of polishing, can reach the vestige effect of people's manual grinding, avoids the lines that rotary sander grinds the zone circle circle come,
2) product weight is light, and portion of the handle weight only has 1/3 of rotary sander, reduces labor strength, avoids rotary sander translator, is difficult to the drawback reducing complete machine weight,
3) portion of the handle does not make electricity consumption, the security worked under improving the environment such as outdoor and humidity,
4) sand paper of circle, the various shape such as square can be used, and convenient mounting and clamping, to the pre-tensioner effect of sandpaper strip.It is convenient to buy, and cost is low, changes the sand paper that rotary sander can only use the flocking of circular strip back, the drawback that cost is high,
5) can realize without side seam polishing, multiple negative and positive angle of can polishing, avoid the drawback that rotary sander is difficult to the positions such as polishing negative and positive angle.
accompanying drawing illustrates:
Fig. 1 is the stereogram of the pneumatic linear reciprocating sander of the present invention;
Fig. 2 is the explosive view of Fig. 1;
Fig. 3 is the stereogram of main body and sand paper clamping plate assembled state;
Fig. 4 is the local structure schematic diagram in sand paper clamping portion;
Fig. 5 is the drawing in side sectional elevation of main body;
Fig. 6 is the cross section axis side view of main body;
Fig. 7 is the profile of spool;
Fig. 8 is the stereogram of spool;
Fig. 9 is the profile of valve pocket;
Figure 10 is the stereogram of valve pocket;
Figure 11-15 is the motion key diagram (casting mesh line local represent into high pressure strength and the pressure gas of going to pistons work chamber, circular section line local represent the pressure release gas in exhaust and pistons work chamber) of spool at valve pocket;
Figure 16 is the center that the initial position of limiting case bottom spool is in valve pocket.
detailed description of the invention:
The pneumatic linear reciprocating sander of the present invention, the main body 2 comprising sand paper clamping plate 1 and be located on sand paper clamping plate 1, described main body 2 is stretched out the piston rod 3 of two reciprocal stretching motions in the same way, the free end of two-piston bar 3 is separately fixed on two supporting seats 4 of sand paper clamping plate; During use, user is hand-held fixing or by rod member stationary body outer surface, and piston rod reciprocal stretching motion in the same way under external force, because main body is relatively fixing, therefore just drive the sand paper linear reciprocating motion of sand paper clamping plate and upper clamping thereof, realize sand paper straight line polishing body surface.
Further, in order to exert a force to sand paper clamping plate preferably, the bottom surface of aforementioned body is provided with several rollers 5 and is resisted against on the upper surface of sand paper clamping plate, and sand paper clamping plate is provided with stopper slot and moves with limited roller 5.
Further, in order to clamp sand paper 13 preferably, above-mentioned sand paper clamping plate both side ends is provided with V-type groove 6, and V-type groove 6 has been installed with V-type compressing tablet 7, described V-type compressing tablet is locked on sand paper clamping plate by wing nut 8.
Further, conveniently use, aforementioned body sidepiece is fixedly connected with curved rod 9, curved rod is connected with extensible gripping handle 10, described gripping handle 10 central part is equipped with sweep-up pipe 11, described sweep-up pipe stretches into the cover cap 12 be located in main body, in use has a large amount of dust to produce, and utilizes sweep-up pipe 11 to be connected with extraneous dust catcher and gets final product dust adsorption.
Further, in order to reasonable in design, aforementioned body comprises the housing K1 anyhow passed through mutually, vertically fixedly be located at the valve pocket K2 in housing and the horizontal chamber cover K3 being fixedly located at valve pocket both sides, the spool K4 that can slide in its body is provided with in described valve pocket K2 body, described two-piston bar 3 is provided with in the cover of described chamber, the medial extremity of described two-piston bar 3 is equipped with piston K5, described spool is cylinder, be provided with that three sections of outer surfaces and valve pocket inner surface match on the cylinder first, second, 3rd annular piston K6, K7, K8, be provided with in spool two be parallel to each other first, second counterbore K9, K10, the first counterbore K9 extends to described second from spool first end K25 toward the second end K11, between 3rd annular piston, and with second, arrange the first perforation K12 between 3rd annular piston to communicate, the second counterbore K10 extends to described first from spool second end K11 toward first end K25, between second annular piston, and with first, arrange the second perforation K13 between second annular piston to communicate, described valve pocket is cylindrical shroud, its center section part is provided with the first through hole K14, be positioned at valve pocket both ends circumference and be all evenly equipped with four left and right second through hole K15, valve pocket is provided with two third through-hole K16 between the first through hole and the second through hole, the third through-hole axial line conllinear on each two of both sides, the first plane that this two axial line is formed and the first through hole axial line perpendicular, have the axial line of four through holes to be positioned in the first plane in the second through hole.
Further, replying to be conducive to piston rod, between above-mentioned two-piston and valve pocket outer surface, being provided with spring K17.
Further, above-mentioned valve pocket surface is positioned at the second through hole, third through-hole position is provided with undergauge K18, the third through-hole of side and the chamber on the left side are overlapped outer surface K19 and are connected, the chamber cover outer surface on this left side is through with left side piston outboard end cavity K20 again, the third through-hole of opposite side and the chamber on the right are overlapped outer surface K21 and are connected, and the chamber cover outer surface on the right of this is through with the right piston outboard end cavity K22 again.
The operation principle of spool and valve pocket:
When Figure 11 represents that supposition is initial, spool is in (right positions and left side principle symmetry) on the left of valve pocket.Air inlet P air inlet, pressure gas passes through the annulus area of spool to working hole B output pressure.The pressure release gas in pistons work chamber is vented to exhaust outlet S1 and S2 by the annulus area of spool by gas port A.Now spool accelerates mobile to the right by left side cavity volume internal gas pressure effect, and right side holds intracavity gas and is vented by exhaust outlet S1 and S2.
Figure 12 represents that spool is subject to left side cavity volume internal gas pressure effect to continue to accelerate to move to the right, will close air inlet P and exhaust outlet S1 and S2.
Figure 13 represents that spool is in valve pocket centre position.Air inlet P, exhaust outlet S1 and S2 are in nearly closed state.Now spool continues to move right by left side cavity volume internal gas pressure and effect of inertia own.
Figure 14 represents that spool moves to valve pocket center deviation right positions.In air inlet P, pressure gas leads to pressure gas by spool annulus area to working hole A.In working hole B, gas connects exhaust outlet S1 and S2 by spool annulus area, and now spool continues to move right by effect of inertia own, but slows down by right side cavity volume inner air pressure.
Figure 15 represents that spool moves to valve pocket right positions.In air inlet P, pressure gas leads to pressure gas by spool annulus area to working hole A.In working hole B, gas connects exhaust outlet S1 and S2 by spool annulus area, and now spool stops by the deceleration of right side cavity volume inner air pressure and starts to move to the left, starts back and forth.
Wherein P is the air inlet of pressure-air air inlet, and corresponding mouth is the first through hole K14.The third through-hole K16 on the corresponding both sides of working hole A, working hole B difference, the second through hole K15 on the corresponding both sides of S1, S2.
Figure 16 represents that the initial position of limiting case bottom spool is in the center of valve pocket.But because of the gravity deflection etc. that mismachining tolerance, Form and position error or total placed angle cause, the capacity of air inlet P air inlet back valve core left and right sides cavity volume all can be made uneven, namely pressure at both sides is uneven, and the direction low to pressure is moved by spool, also can start the circulation of B figure.
On spool of the present invention and valve pocket and market, the difference of other air operated reversing valve is
1) do not make electricity consumption and other external control strength, signal etc., realize the automatic reciprocating commutation motion of air valve.
Existing reversal valve or electromagnetic switch on the market, or pneumatic external control commutation, outside is all needed to provide commutation signal, essence provides electromagnetism or pneumatic commutation thrust, could realize the commutation of valve, and this reversal valve produces commutation thrust by pneumatic in valve inside, eliminate external control link, as long as input air pressure, namely spool is in ceaselessly in commutation process automatically, is applicable to the mechanism needing to automatically move back and forth.
2) commutating frequency is high, can stepless frequency modulation.
Existing reversal valve on the market, the frequency of commutation limits by the frequency of the external control such as electromagnetism, gas control signal, and be difficult to realize high frequency direction changing ratio, the commutating frequency of this reversal valve is higher, and can stepless frequency modulation.
(commutating frequency is controlled within the scope of 20-80Hz, and frequency is high.
Existing reversal valve on the market, the frequency of commutation limits by the frequency of the external control such as electromagnetism, gas control signal, and be difficult to realize high frequency direction changing ratio (the highest be generally 8Hz), the commutating frequency of this reversal valve is relatively high.(controlled within the scope of 20-80Hz))
3) starting pressure of commutation needs is little, and output services decline of pressure is little.
Existing reversal valve will realize spool commutation on the market, generally all needs larger input air pressure (being generally all greater than 1.5Kg air pressure) could realize stable commutation action, and the starting pressure that the action of this reversal valve needs is lower.(when air pressure is 1Kg still can steady operation)
Secondly, this reversal valve commutation gas channel is separated with working air flow path, and working air current is little by commutation airflow influence, and output services decline of pressure is little.
Further, in order to reasonable in design, above-mentioned left side piston outboard end cavity and the right piston outboard end cavity all have damping ring and end cap K23 shutoff, and all there are airtight axle K24 and the shutoff of O type circle in valve pocket two ends.
The using method of the pneumatic linear reciprocating sander of the present invention, described pneumatic linear reciprocating sander comprises sand paper clamping plate and is located at the main body on sand paper clamping plate, described main body is stretched out the piston rod of two reciprocal stretching motions in the same way, the free end of two-piston bar is separately fixed on two supporting seats of sand paper clamping plate, during use, user is hand-held fixing or by rod member stationary body outer surface, piston rod is reciprocal stretching motion in the same way under external force, drive the sand paper linear reciprocating motion of sand paper clamping plate and upper clamping thereof, realize sand paper straight line polishing body surface.
The present invention's pneumatic linear reciprocating sander advantage:
1) linear reciprocating polishing, multiple irregular surface of polishing, can reach the vestige effect of people's manual grinding, and avoids the lines that rotary sander grinds the zone circle circle come.
2) product weight is light, and portion of the handle weight only has 1/3 of rotary sander, reduces labor strength, avoids rotary sander translator, is difficult to the drawback reducing complete machine weight,
3) portion of the handle does not make electricity consumption, the security worked under improving the environment such as outdoor and humidity,
4) sand paper of circle, the various shape such as square can be used, and convenient mounting and clamping, to the pre-tensioner effect of sandpaper strip.It is convenient to buy, and cost is low, changes the sand paper that rotary sander can only use the flocking of circular strip back, the drawback that cost is high,
5) can realize without side seam polishing, multiple negative and positive angle of can polishing, avoid the drawback that rotary sander is difficult to the positions such as polishing negative and positive angle.
Claims (10)
1. a pneumatic linear reciprocating sander, it is characterized in that: comprise sand paper clamping plate and be located at the main body on sand paper clamping plate, described main body is stretched out the piston rod of two reciprocal stretching motions in the same way, the free end of two-piston bar is separately fixed on two supporting seats of sand paper clamping plate.
2. pneumatic linear reciprocating sander according to claim 1, is characterized in that: the bottom surface of described main body is provided with several rollers and is resisted against on the upper surface of sand paper clamping plate.
3. pneumatic linear reciprocating sander according to claim 1, is characterized in that: described sand paper clamping plate both side ends is provided with V-type groove, and V-type groove has been installed with V-type compressing tablet, described V-type compressing tablet is locked on sand paper clamping plate by wing nut.
4. pneumatic linear reciprocating sander according to claim 1, it is characterized in that: described body side is fixedly connected with curved rod, curved rod is connected with extensible gripping handle, and described gripping handle central part is equipped with sweep-up pipe, and described sweep-up pipe stretches into the cover cap be located in main body.
5. pneumatic linear reciprocating sander according to claim 1, it is characterized in that: described main body comprises the housing anyhow passed through mutually, vertically fixedly be located at the valve pocket in housing and the horizontal chamber cover being fixedly located at valve pocket both sides, the spool that can slide in its body is provided with in described valve sleeve body, described two-piston bar is provided with in the cover of described chamber, the medial extremity of described two-piston bar is equipped with piston, described spool is cylinder, be provided with that three sections of outer surfaces and valve pocket inner surface match on the cylinder first, second, 3rd annular piston, be provided with in spool two be parallel to each other first, second counterbore, first counterbore extends to described second from spool first end toward the second end, between 3rd annular piston, and with second, arrange the first perforation between 3rd annular piston to communicate, second counterbore extends to described first from spool second end toward first end, between second annular piston, and with first, arrange the second perforation between second annular piston to communicate, described valve pocket is cylindrical shroud, its center section part is provided with the first through hole, be positioned at valve pocket both ends circumference and be all evenly equipped with four left and right second through holes, valve pocket is provided with two third through-holes between the first through hole and the second through hole, the third through-hole axial line conllinear on each two of both sides, the first plane that this two axial line is formed and the first through hole axial line perpendicular, have the axial line of four through holes to be positioned in the first plane in the second through hole.
6. pneumatic linear reciprocating sander according to claim 5, is characterized in that: be provided with spring between two-piston and valve pocket outer surface.
7. pneumatic linear reciprocating sander according to claim 5, it is characterized in that: described valve pocket surface is positioned at the second through hole, third through-hole position is provided with undergauge, the third through-hole of side and the chamber on the left side are overlapped outer surface and are connected, the chamber cover outer surface on this left side is through with left side piston outboard end cavity again, the third through-hole of opposite side and the chamber on the right are overlapped outer surface and are connected, and the chamber cover outer surface on the right of this is through with the right piston outboard end cavity again.
8. pneumatic linear reciprocating sander according to claim 5, is characterized in that: described left side piston outboard end cavity and the right piston outboard end cavity all have damping ring and end cap shutoff, and all there are airtight axle and the shutoff of O type circle in valve pocket two ends.
9. the using method of a pneumatic linear reciprocating sander, it is characterized in that: described pneumatic linear reciprocating sander comprises sand paper clamping plate and is located at the main body on sand paper clamping plate, described main body is stretched out the piston rod of two reciprocal stretching motions in the same way, the free end of two-piston bar is separately fixed on two supporting seats of sand paper clamping plate, during use, user is hand-held fixing or by rod member stationary body outer surface, piston rod is reciprocal stretching motion in the same way under external force, drive the sand paper linear reciprocating motion of sand paper clamping plate and upper clamping thereof, realize sand paper straight line polishing body surface.
10. the using method of pneumatic linear reciprocating sander according to claim 9, it is characterized in that: described main body comprises the housing anyhow passed through mutually, vertically fixedly be located at the valve pocket in housing and the horizontal chamber cover being fixedly located at valve pocket both sides, the spool that can slide in its body is provided with in described valve sleeve body, described two-piston bar is provided with in the cover of described chamber, the medial extremity of described two-piston bar is equipped with piston, described spool is cylinder, be provided with that three sections of outer surfaces and valve pocket inner surface match on the cylinder first, second, 3rd annular piston, be provided with in spool two be parallel to each other first, second counterbore, first counterbore extends to described second from spool first end toward the second end, between 3rd annular piston, and with second, arrange the first perforation between 3rd annular piston to communicate, second counterbore extends to described first from spool second end toward first end, between second annular piston, and with first, arrange the second perforation between second annular piston to communicate, described valve pocket is cylindrical shroud, its center section part is provided with the first through hole, be positioned at valve pocket both ends circumference and be all evenly equipped with four left and right second through holes, valve pocket is provided with two third through-holes between the first through hole and the second through hole, the third through-hole axial line conllinear on each two of both sides, the first plane that this two axial line is formed and the first through hole axial line perpendicular, have the axial line of four through holes to be positioned in the first plane in the second through hole, air inlet P is corresponding with the first through hole K14, the third through-hole K16 on the corresponding both sides of working hole A, working hole B difference, the second through hole K15 on the corresponding both sides of S1, S2, first stage, air inlet P air inlet, pressure gas passes through the annulus area of spool to working hole B output pressure, the pressure release gas in pistons work chamber is vented to exhaust outlet S1 and S2 by the annulus area of spool by gas port A, now spool accelerates mobile to the right by left side cavity volume internal gas pressure effect, and right side holds intracavity gas and is vented by exhaust outlet S1 and S2,
Second stage, spool continues to accelerate to the right to move by left side cavity volume internal gas pressure effect, will close air inlet P and exhaust outlet S1 and S2.
Phase III, spool is in valve pocket centre position.Air inlet P, exhaust outlet S1 and S2 are in nearly closed state.Now spool continues to move right by left side cavity volume internal gas pressure and effect of inertia own.
Fourth stage, spool moves to valve pocket center deviation right positions.In air inlet P, pressure gas leads to pressure gas by spool annulus area to working hole A.In working hole B, gas connects exhaust outlet S1 and S2 by spool annulus area, and now spool continues to move right by effect of inertia own, but slows down by right side cavity volume inner air pressure.
Five-stage, spool moves to valve pocket right positions.In air inlet P, pressure gas leads to pressure gas by spool annulus area to working hole A.In working hole B, gas connects exhaust outlet S1 and S2 by spool annulus area, and now spool stops by the deceleration of right side cavity volume inner air pressure and starts to move to the left, starts back and forth.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410790996.0A CN104440440B (en) | 2014-12-19 | 2014-12-19 | Pneumatic linear reciprocating polisher and using method thereof |
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| CN201410790996.0A CN104440440B (en) | 2014-12-19 | 2014-12-19 | Pneumatic linear reciprocating polisher and using method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108000360A (en) * | 2017-12-29 | 2018-05-08 | 宁波浙达技术服务有限公司 | A kind of pneumatic type sander |
| CN110962000A (en) * | 2019-11-13 | 2020-04-07 | 广东博智林机器人有限公司 | Variable-pitch crank slider driving mechanism, polishing manipulator and polishing robot |
| CN112917277A (en) * | 2021-01-27 | 2021-06-08 | 贵州捷路安科技发展有限公司 | Polishing device for floor construction of parking lot |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104440440B (en) | 2017-01-04 |
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