CN206925153U - A kind of speed-measuring roll device - Google Patents
A kind of speed-measuring roll device Download PDFInfo
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- CN206925153U CN206925153U CN201720920879.0U CN201720920879U CN206925153U CN 206925153 U CN206925153 U CN 206925153U CN 201720920879 U CN201720920879 U CN 201720920879U CN 206925153 U CN206925153 U CN 206925153U
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Abstract
The utility model discloses a kind of speed-measuring roll device, including the roller that tests the speed (1), encoder (2), rotating shaft (3), swing arm (4) and elastomeric element (7), the roller (1) that tests the speed is located at one end of swing arm (4), elastomeric element (7) is located at the other end of swing arm (4), rotating shaft (3) is located between the both ends of swing arm (4), swing arm (4) can be rotated with rotating shaft (3) for axle, test the speed roller (1) and encoder (2) it is coaxially connected, encoder (2) can measure the rotational angle of the roller that tests the speed (1), test the speed the center line of roller (1) and the centerline parallel of rotating shaft (3), elastomeric element (7) can give swing arm (4) to provide restoring force.The speed-measuring roll device is compact-sized, and adjustment is flexible, and maintenance is easy, and manufacturing cost is low.The present apparatus is applied to the object speed of detection level motion, realizes the accurate control of moving object speed and position.
Description
Technical field
Rolling production apparatus field is the utility model is related to, particularly a kind of speed-measuring roll device.
Background technology
At present, the mode that tests the speed common in steel rolling production-line, detected more using contactless sensor, pass through setting
A pair of proximity switches or grating sensor, it is first determined the distance of two sensors, then by detect by 2 points when
Between, calculate the average speed of rolled piece.It is larger that sensor alignment error and response time hysteresis result in measuring speed error；Separately
Outside, it is also necessary to according to the length of rolled piece, adjust the distance of sensor, speed and the position of rolled piece can not be controlled in real time.Not only survey
Adjustment time length is measured, after testing the speed, it is impossible to which the speed of detection testee in real time, control accuracy is low, cost is high.
Utility model content
In order to solve the problems, such as that existing speed measuring device measurement accuracy is low, the one kind that the utility model provides test the speed roller dress
Put, the speed-measuring roll device tests the speed, and scope is big and accuracy of detection is high, is easy to detect, and can Real-time Feedback to control system, it is real
The now control of the speed to the object that tested the speed and position.
Technical scheme is used by the utility model solves its technical problem：A kind of speed-measuring roll device, including the roller that tests the speed,
Encoder, rotating shaft, swing arm and elastomeric element, the roller that tests the speed are located at one end of swing arm, and elastomeric element is located at the other end of swing arm, rotating shaft
Between the both ends of swing arm, swing arm can rotate by axle of rotating shaft, and the roller that tests the speed is coaxially connected with encoder, and encoder can be surveyed
The rotational angle of fast roller is measured, the center line for the roller that tests the speed and the centerline parallel of rotating shaft, elastomeric element can provide back to swing arm
Multiple power.
The speed-measuring roll device also includes riser and connecting plate, and riser is parallel with swing arm, and the both ends of connecting plate are respectively with standing
Plate and swing arm are connected, and test the speed roller between riser and swing arm.
The roller that tests the speed is hollow-core construction, and the roller that tests the speed contains columnar barrel, one end of barrel be provided with first end plate and
First roll shaft, the other end of barrel are provided with the second end plate and the second roll shaft, one end of the first roll shaft and swing arm plugged and fixed, the
The other end of one roll shaft is plugged in first end plate, one end of the second roll shaft and the second end plate plugged and fixed, the second roll shaft it is another
One end is plugged in riser, and the axis of the axis of the first roll shaft and the second roll shaft overlaps.
Riser is connected with bearing block, and one end of bearing block is cylindrical shape, and the other end of bearing block is annular shape, bearing block
One end matching is plugged in riser, and the other end of the second roll shaft is plugged in one end of bearing block, the other end of the second roll shaft
It is connected between one end of bearing block by bearing, the other end and the riser of bearing block are connected.
The speed-measuring roll device also includes encoder installing plate, and bearing seat is stood between riser and encoder installing plate
Plate is parallel with encoder installing plate, and encoder installing plate contains inner via hole, contains annular protrusion outside the inner via hole, the annular protrusion
Matching is plugged in the other end of bearing block, and the mandrel of encoder is connected solid with the other end of the second roll shaft by shaft coupling
Fixed, the shaft coupling is located in the inner via hole.
The speed-measuring roll device also includes encoder protective case, and encoder protective case is that the cylinder that the other end opens is closed in one end
Shape structure, open end and the riser of encoder protective case are connected, and encoder is located in encoder protective case, encoder installation
Plate is located in the open end of encoder protective case, and the center line of encoder protective case is vertical with encoder installing plate.
The speed-measuring roll device also includes the bearing of tabular, and swing arm is in angular, and rotating shaft is located at the angular summit position, pendulum
Arm is parallel with bearing, and one end of rotating shaft is plugged in bearing, and the other end of rotating shaft is plugged in swing arm.
Nut and pad are fixed with outside one end of rotating shaft, friction sleeve, rotating shaft are arranged between the other end of rotating shaft and swing arm
Center line be horizontal, the center line of rotating shaft is vertical with swing arm, and annular bolt, one end of elastomeric element are connected with bearing
It is connected with the other end of swing arm, the circular head of the other end of elastomeric element and annular bolt is connected, annular bolt
Center line and rotating shaft central axis, when screwing annular bolt, the circular head of annular bolt and the other end of swing arm
The distance between can increase or reduce.
Screw rod is connected with bearing, one end of screw rod is located between the other end and bearing of swing arm, the center line of screw rod with
The centerline parallel of annular bolt, when screwing screw rod, the distance between other end of screw rod and swing arm can increase or reduce；
When swing arm rotates, screw rod can be with another end in contact of swing arm.
The speed-measuring roll device also includes base, and base contains top straight panel and base platform, the lower end of top straight panel with
The upper surface of base platform is connected, and top straight panel is parallel with bearing, and top straight panel is connected with bearing.
The beneficial effects of the utility model are：The speed-measuring roll device is according to the linear velocity for roller rotation of testing the speed and by the object that tests the speed
The design of horizontal movement velocity identical principle, the rotating speed for the roller that tested the speed by encoder measurement, and then detection is tested the speed object
Horizontal velocity.In addition, the speed-measuring roll device installation and adjustment can realize the adjustment of height and angle, Adjustment precision height.Testing the speed
During be pressed against by the spring tension roller that makes to test the speed with testee, the horizontal linear velocity for the roller that makes to test the speed with by the thing that tests the speed
Body speed is identical.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding to of the present utility model, this practicality
New schematic description and description is used to explain the utility model, does not form to improper restriction of the present utility model.
Fig. 1 is the front view of speed-measuring roll device described in the utility model.
Fig. 2 is the left view of speed-measuring roll device described in the utility model.
Fig. 3 is along the sectional view in A-A directions in Fig. 1.
Fig. 4 is the schematic diagram of roller and encoder position of being tested the speed in Fig. 3.
Fig. 5 is the schematic diagram at encoder installing plate position in Fig. 3.
Fig. 6 is the schematic diagram of shaft position in Fig. 3.
1st, test the speed roller；2nd, encoder；3rd, rotating shaft；4th, swing arm；5th, bearing；6th, base；7th, elastomeric element；8th, annular bolt；
9th, riser；10th, connecting plate；11st, barrel；12nd, first end plate；13rd, the first roll shaft；14th, the second end plate；15th, the second roll shaft；
16th, bearing block；17th, encoder installing plate；18th, annular protrusion；19th, encoder protective case；20th, friction sleeve；21st, top straight panel；
22nd, base platform；23rd, screw rod；24th, by the object that tests the speed.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the utility model in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
A kind of speed-measuring roll device, including the roller 1 that tests the speed, encoder 2, rotating shaft 3, swing arm 4 and elastomeric element 7, the roller 1 that tests the speed are located at
One end of swing arm 4, elastomeric element 7 are located at the other end of swing arm 4, and rotating shaft 3 is located between the both ends of swing arm 4, swing arm 4 can with turn
Axle 3 be axle rotate, test the speed roller 1 and encoder 2 it is coaxially connected, encoder 2 can measure the rotational angle for the roller 1 that tests the speed, and test the speed roller 1
Center line and rotating shaft 3 centerline parallel, elastomeric element 7 can give swing arm 4 to provide restoring force, as shown in Figure 1 to Figure 3.
The implication coaxially connected with encoder 2 of roller 1 that test the speed is that the roller 1 that tests the speed is connected and encoder 2 can be surveyed with encoder 2
Measure the rotational angle of fast roller 1.In use, the object 24 that tested the speed is pressed in and tested the speed on roller 1, the roller 1 that tests the speed follows the object 24 that tested the speed
Rotation, encoder 2 calculates the rotating speed for the roller 1 that tests the speed according to the rotational angle for the roller 1 that in a period of time, tests the speed, further according to the roller 1 that tests the speed
Rotating speed and diameter can calculate the horizontal velocity for the object 24 that tested the speed, and the speed and position for realizing the object that tested the speed accurately control.
In the present embodiment, the speed-measuring roll device also includes riser 9 and connecting plate 10, and riser 9 is parallel with swing arm 4, even
The both ends of fishplate bar 10 are connected with riser 9 and swing arm 4 respectively, and the section of connecting plate 10 is curved, and the internal diameter of connecting plate 10 is big
In the external diameter for the roller 1 that tests the speed, roller 1 is tested the speed between riser 9 and swing arm 4, and riser 9 and swing arm 4 roller 1 that will test the speed are fixed and carried to it
For support force.
In the present embodiment, the roller 1 that tests the speed is hollow-core construction, and the roller 1 that tests the speed contains columnar barrel 11, barrel 11
One end is provided with the roll shaft 13 of first end plate 12 and first, and the other end of barrel 11 is provided with the second end plate 14 and the second roll shaft 15, the
End plate 12 is fixed in one end of barrel 11, and the second end plate 14 is fixed in the other end of barrel 11.
Specifically, one end of the first roll shaft 13 and the plugged and fixed of swing arm 4, the other end of the first roll shaft 13 are plugged in first end
In plate 12, connected between the other end and first end plate 12 of the first roll shaft 13 by bearing, one end and second of the second roll shaft 15
The plugged and fixed of end plate 14, the other end of the second roll shaft 15 are plugged in riser 9, the axis of the first roll shaft 13 and the second roll shaft 15
Axis overlaps, as shown in Figure 4.Outer roll sleeve is also arranged with outside barrel 11.
In the present embodiment, riser 9 is connected with bearing block 16, and one end of bearing block 16 is cylindrical shape, bearing block 16 it is another
One end is annular shape, and one end matching of bearing block 16 is plugged in the installation through-hole of riser 9, and the other end of the second roll shaft 15 is inserted
It is connected in one end of bearing block 16, is connected between the other end of the second roll shaft 15 and one end of bearing block 16 by bearing, bearing
The other end of seat 16 is connected with riser 9.
In the present embodiment, the speed-measuring roll device also includes encoder installing plate 17, and bearing block 16 is located at riser 9 and compiled
Between code device installing plate 17, riser 9 is parallel with encoder installing plate 17, and riser 9, bearing block 16 and encoder installing plate 17 are successively
It is stacked, encoder installing plate 17 contains inner via hole, and annular protrusion 18 is contained outside the inner via hole, the annular protrusion 18 matching
It is plugged in the other end of bearing block 16, i.e., the external diameter of the annular protrusion 18 is equal to the internal diameter of the other end of bearing block 16.
Encoder 2 can use the encoder for having mandrel, and encoder 2 can use the encoder for having spindle-less.It is preferred that compile
Code device 2 is the encoder for having mandrel, and the other end of the mandrel of encoder 2 and the second roll shaft 15 is connected by shaft coupling, should
Shaft coupling is located in the inner via hole, as shown in Figure 5.
In the present embodiment, the speed-measuring roll device also includes encoder protective case 19, and encoder protective case 19 is one end
The tubular structure that the other end opens is closed, open end and the riser 9 of encoder protective case 19 are connected, and encoder 2 is positioned at volume
In code device protective case 19, encoder installing plate 17 is located in the open end of encoder protective case 19, in encoder protective case 19
Heart line is vertical with encoder installing plate 17, as shown in Figure 4.
In the present embodiment, the speed-measuring roll device also includes the bearing 5 of tabular, and lateral bending to the left is contained in the upper end of bearing 5
Bent protuberance, as shown in figure 1, swing arm 4 is in angular, it is obtuse angle that this is angular, and rotating shaft 3 is located at the angular summit position, swing arm 4
Parallel with bearing 5, one end of rotating shaft 3 is plugged in the protuberance of bearing 5, and the other end of rotating shaft 3 is plugged in the top of swing arm 4
In point position.
In the present embodiment, nut and pad are fixed with outside one end of rotating shaft 3, swing arm 4 and bearing 5 are connected by rotating shaft 3
Fixed, swing arm 4 can be rotated with rotating shaft 3 for axle, and bearing 5 is immovable and rotates, between the other end of rotating shaft 3 and swing arm 4
Friction sleeve 20 is arranged with, the center line of rotating shaft 3 is horizontal, and the center line of rotating shaft 3 is vertical with the plane where swing arm 4, branch
Annular bolt 8 is connected with seat 5, one end of elastomeric element 7 and the other end of swing arm 4 are connected, the other end of elastomeric element 7
It is connected with the circular head of annular bolt 8, the center line of annular bolt 8 and the central axis of rotating shaft 3, when screwing annular
During bolt 8, the distance between the circular head of annular bolt 8 and other end of swing arm 4 can increase or reduce.
Swing arm 4, elastomeric element 7 and annular bolt 8 are respectively positioned on the same side surface of bearing 5, as shown in figure 1, swing arm 4, bullet
Property part 7 and annular bolt 8 are respectively positioned on bearing 5 towards the surface on the outside of Fig. 1 papers.By screwing annular bolt 8, make annular spiral shell
The distance between the circular head of bolt 8 and the other end of swing arm 4 increase or reduced, so as to which regulation elasticity part 7 applies to swing arm 4
Restoring force size.In addition, elastomeric element 7 can be cylindrical spring, rotating shaft 3 is located at the top of elastomeric element 7, and test the speed roller 1
Positioned at the top of rotating shaft 3.
In the present embodiment, screw rod 23, screw rod fixed block and nut are connected with bearing 5, as shown in fig. 6, screw rod 23
One end is located between the other end and bearing 5 of swing arm 4, the centerline parallel of the center line of screw rod 23 and annular bolt 8, screw rod 23
Center line be also horizontal, when screwing screw rod 23, the distance between other end of screw rod 23 and swing arm 4 can increase or
Reduce；When swing arm 4 rotates, screw rod 23 can be with another end in contact of swing arm 4.
Screw rod 23, screw rod fixed block and nut are also respectively positioned on bearing 5 towards the surface on the outside of Fig. 1 papers, i.e. screw rod 23, spiral shell
Bar fixed block, nut, swing arm 4, elastomeric element 7 and annular bolt 8 are respectively positioned on the same side surface of bearing 5.The screw rod fixed block
It is fixedly connected with bearing 5, screw rod 23 and the screw rod fixed block grafting, the afterbody of screw rod 23 point to the other end of swing arm 4, the nut
It is sheathed on outside the afterbody of screw rod 23, the nut is located between the other end of swing arm 4 and the screw rod fixed block, passes through adjusting bolt 23
Afterbody position, the swing angle scope of swing arm 4 can be adjusted.
In the present embodiment, the speed-measuring roll device also includes base 6, and base 6 contains top straight panel 21 and base platform
22, the lower end and the upper surface of base platform 22 of top straight panel 21 are connected, and top straight panel 21 is parallel with bearing 5, and top
Straight panel 21 is connected with the stacking of bearing 5, as shown in Figure 1.
The service condition of the speed-measuring roll device is described below：
When tested the speed object 24 by when, the object 24 that tested the speed tests the speed pressure roller 1, drives swing arm 4 to swing certain angle
Degree, elastomeric element 7 (spring) is stretched, and spring tension changes into pressure, and the roller 1 that makes to test the speed is pressed against the surface of object 24 of being tested the speed,
The roller 1 that tests the speed follows the object synchronous axial system that tested the speed, as shown in Figure 1.
As shown in Fig. 2 the roller 1 that tests the speed is co-axially mounted encoder 2, encoder 2 tests the speed the rotating speed of roller 1, according to the roller 1 that tests the speed
Diameter can calculate the speed of the object that tested the speed, realize to by the speed and position detection control of the object 24 that tests the speed.Test the speed roller 1
In swing arm 4, the lower end of swing arm 4 is connected with spring, swing arm 4 can around the shaft 3 rotation, rotating shaft 3, spring, annular bolt 8 are pacified
On bearing 5, bearing 5 is fixed on base 6.
Annular bolt 8 is arranged on bearing 5, and the position of adjustment spring can be driven by rotary annular bolt 8, and regulation is surveyed
The height of fast roller 1, and then adjust the pulling force of spring when testing the speed.
By changing base 6 and the contact surface shape of bearing 5, the setting angle for the roller 1 that tests the speed can be adjusted.As shown in Fig. 2 branch
The contact surface of seat 5 and base 6 is vertical plane, and the roller 1 that now tests the speed is horizontal positioned.
It is described above, only specific embodiment of the utility model, it is impossible to which the scope that utility model implemented, institute are limited with it
With the displacement of its equivalent assemblies, or the equivalent variations made according to the utility model patent protection domain and modification, it should all still fall within
The category that this patent is covered.In addition, between technical characteristic and technical characteristic in the utility model, technical characteristic and technical scheme
Between, can be used with independent assortment between technical scheme and technical scheme.
Claims (10)
1. a kind of speed-measuring roll device, it is characterised in that the speed-measuring roll device includes test the speed roller (1), encoder (2), rotating shaft
(3), swing arm (4) and elastomeric element (7), the roller that tests the speed (1) are located at one end of swing arm (4), and elastomeric element (7) is located at swing arm (4)
The other end, rotating shaft (3) are located between the both ends of swing arm (4), swing arm (4) can with rotating shaft (3) be axle rotate, the roller that tests the speed (1) with
Encoder (2) is coaxially connected, and encoder (2) can measure the rotational angle of the roller that tests the speed (1), and the center line of the roller that tests the speed (1) is with turning
The centerline parallel of axle (3), elastomeric element (7) can give swing arm (4) to provide restoring force.
2. speed-measuring roll device according to claim 1, it is characterised in that the speed-measuring roll device also include riser (9) and
Connecting plate (10), riser (9) is parallel with swing arm (4), and the both ends of connecting plate (10) are connected admittedly with riser (9) and swing arm (4) respectively
Fixed, the roller that tests the speed (1) is located between riser (9) and swing arm (4).
3. speed-measuring roll device according to claim 2, it is characterised in that the roller that tests the speed (1) is hollow-core construction, the roller that tests the speed (1)
Containing columnar barrel (11), one end of barrel (11) is provided with first end plate (12) and the first roll shaft (13), barrel
(11) the other end is provided with the second end plate (14) and the second roll shaft (15), and one end of the first roll shaft (13) and swing arm (4) grafting are solid
Fixed, the other end of the first roll shaft (13) is plugged in first end plate (12), one end and the second end plate (14) of the second roll shaft (15)
Plugged and fixed, the other end of the second roll shaft (15) are plugged in riser (9), the axis and the second roll shaft (15) of the first roll shaft (13)
Axis overlap.
4. speed-measuring roll device according to claim 3, it is characterised in that riser (9) is connected with bearing block (16), bearing block
(16) one end is cylindrical shape, and the other end of bearing block (16) is annular shape, and being plugged in for one end matching of bearing block (16) is vertical
In plate (9), the other end of the second roll shaft (15) is plugged in one end of bearing block (16), the other end and axle of the second roll shaft (15)
Connected between one end of bearing (16) by bearing, the other end and the riser (9) of bearing block (16) are connected.
5. speed-measuring roll device according to claim 4, it is characterised in that the speed-measuring roll device also includes encoder and installed
Plate (17), bearing block (16) are located between riser (9) and encoder installing plate (17), riser (9) and encoder installing plate (17)
Parallel, encoder installing plate (17) contains inner via hole, and annular protrusion (18), the annular protrusion (18) matching are contained outside the inner via hole
Be plugged in the other end of bearing block (16), the mandrel of encoder (2) and the other end of the second roll shaft (15) pass through shaft coupling
It is connected, the shaft coupling is located in the inner via hole.
6. speed-measuring roll device according to claim 5, it is characterised in that the speed-measuring roll device also includes encoder and protected
Cover (19), encoder protective case (19) is that the tubular structure that the other end opens, the opening of encoder protective case (19) are closed in one end
End is connected with riser (9), and encoder (2) is located in encoder protective case (19), and encoder installing plate (17) is positioned at coding
In the open end of device protective case (19), the center line of encoder protective case (19) is vertical with encoder installing plate (17).
7. speed-measuring roll device according to claim 1, it is characterised in that the speed-measuring roll device also includes the bearing of tabular
(5), swing arm (4) is in angular that rotating shaft (3) is located at the angular summit position, and swing arm (4) is parallel with bearing (5), rotating shaft (3)
One end is plugged in bearing (5), and the other end of rotating shaft (3) is plugged in swing arm (4).
8. speed-measuring roll device according to claim 7, it is characterised in that be fixed with nut and pad outside one end of rotating shaft (3)
Piece, friction sleeve (20) is arranged between the other end of rotating shaft (3) and swing arm (4), the center line of rotating shaft (3) is horizontal, and turns
The center line of axle (3) is vertical with swing arm (4), and annular bolt (8), one end of elastomeric element (7) and swing arm are connected with bearing (5)
(4) the other end is connected, and the circular head of the other end and annular bolt (8) of elastomeric element (7) is connected, annular spiral shell
The center line of bolt (8) and the central axis of rotating shaft (3), when screwing annular bolt (8), the circular head of annular bolt (8)
The distance between other end of swing arm (4) can increase or reduce.
9. speed-measuring roll device according to claim 8, it is characterised in that screw rod (23), screw rod are connected with bearing (5)
(23) one end is located between the other end of swing arm (4) and bearing (5), in the center line and annular bolt (8) of screw rod (23)
Heart line is parallel, and when screwing screw rod (23), the distance between screw rod (23) and other end of swing arm (4) can increase or reduce；
When swing arm (4) rotates, screw rod (23) can be with another end in contact of swing arm (4).
10. speed-measuring roll device according to claim 7, it is characterised in that the speed-measuring roll device also includes base (6),
Base (6) contains top straight panel (21) and base platform (22), the lower end of top straight panel (21) and the upper table of base platform (22)
Face is connected, and top straight panel (21) is parallel with bearing (5), and top straight panel (21) is connected with bearing (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720920879.0U CN206925153U (en) | 2017-07-27 | 2017-07-27 | A kind of speed-measuring roll device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720920879.0U CN206925153U (en) | 2017-07-27 | 2017-07-27 | A kind of speed-measuring roll device |
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| Publication Number | Publication Date |
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| CN206925153U true CN206925153U (en) | 2018-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720920879.0U Active CN206925153U (en) | 2017-07-27 | 2017-07-27 | A kind of speed-measuring roll device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107297392A (en) * | 2017-07-27 | 2017-10-27 | 北京京诚瑞信长材工程技术有限公司 | A kind of speed-measuring roll device |
| CN108722534A (en) * | 2018-04-17 | 2018-11-02 | 武汉轻工大学 | Measurement sensor and self feed back automation compensation hulling machine |
-
2017
- 2017-07-27 CN CN201720920879.0U patent/CN206925153U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107297392A (en) * | 2017-07-27 | 2017-10-27 | 北京京诚瑞信长材工程技术有限公司 | A kind of speed-measuring roll device |
| CN108722534A (en) * | 2018-04-17 | 2018-11-02 | 武汉轻工大学 | Measurement sensor and self feed back automation compensation hulling machine |
| CN108722534B (en) * | 2018-04-17 | 2023-09-26 | 武汉轻工大学 | Measurement sensor and self-feedback automatic compensation rice huller |
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