CN111837644B - Anti-blocking discharging device and method for agricultural machinery elevator - Google Patents
Anti-blocking discharging device and method for agricultural machinery elevator Download PDFInfo
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- CN111837644B CN111837644B CN202010688707.1A CN202010688707A CN111837644B CN 111837644 B CN111837644 B CN 111837644B CN 202010688707 A CN202010688707 A CN 202010688707A CN 111837644 B CN111837644 B CN 111837644B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D61/00—Elevators or conveyors for binders or combines
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D45/00—Harvesting of standing crops
- A01D45/02—Harvesting of standing crops of maize, i.e. kernel harvesting
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Abstract
The invention discloses an anti-blocking discharging device and method for an agricultural machinery elevator in the technical field of agricultural machinery elevators, and the device comprises a shell, wherein the shell is positioned at the outlet end of the elevator, a rotating motor is arranged in the shell, the power output end of the rotating motor is coaxially connected with a driving shaft, the bottom end of the driving shaft is provided with a disturbing device, the driving shaft is sleeved with a driving wheel, the driving wheel is connected with a driven wheel through a belt, the driven wheel is sleeved on a driven shaft, the driven shaft is sleeved with a cam, the outer wall of the cam is contacted with a round wheel, the round wheel is sleeved on the outer wall of a sliding rod, one end, far away from the cam, of the round wheel is connected with a push plate through a connecting rod, the outer wall of the driven shaft is sleeved with two groups of limiting bearings, the outer walls of the limiting bearings are connected with the sliding rod through a reset spring, the bottom end of the sliding rod is provided with an actuating device, and a metal plate is arranged below the actuating device.
Description
Technical Field
The invention relates to the technical field of agricultural machinery elevators, in particular to an anti-blocking discharging device and method for an agricultural machinery elevator.
Background
In the harvesting process of corn, the elevator is usually combined with a harvester for use, harvested corn cobs can be transferred to a truck, agricultural automatic production is achieved, and in the harvesting process, corn silks, straws, weed vines and the like on the corn cobs can often enable the corn cobs to be wound together, so that a discharge hole of the elevator is blocked, an outlet of the elevator is blocked, batch harvesting is inconvenient, and therefore the anti-blocking discharging device and the method for the agricultural mechanical elevator are provided.
Disclosure of Invention
The invention aims to provide an anti-blocking discharging device and an anti-blocking discharging method for an agricultural machinery elevator, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an anti-blocking discharging device for an agricultural machinery elevator comprises a shell, wherein the shell is positioned at the outlet end of the elevator, a rotating motor is arranged in the shell, the power output end of the rotating motor is coaxially connected with a driving shaft, the bottom end of the driving shaft is provided with a disturbing device, the driving shaft is sleeved with a driving wheel, the driving wheel is connected with a driven wheel through a belt, the driven wheel is sleeved on a driven shaft, the driven shaft is rotatably connected with the top end of an inner cavity of the shell, the driven shaft is sleeved with a cam, the outer wall of the cam is in contact with a round wheel, the round wheel is sleeved on the outer wall of a vertical sliding rod, one end, far away from the cam, of the round wheel is connected with a push plate through a connecting rod, the sliding rod is fixedly connected with a sliding block at the top end of the push plate, the top end of the inner cavity of the shell is provided with a limiting sliding chute mutually matched with the sliding block, and the outer wall of the driven shaft is sleeved with two groups of limiting bearings, the outer wall of the limiting bearing is connected with a sliding rod through a return spring, an actuating device is arranged at the bottom end of the sliding rod, and a metal plate is arranged below the actuating device.
Further, the disturbance device includes the rotation axis, the outer wall of rotation axis sets up spacing round, the outer wall of rotation axis evenly sets up the rotor plate, the top and the spacing round sliding connection of rotor plate, half of the bottom of spacing round is the metal sheet, and half is unsettled.
Further, actuating device includes the sleeve pipe, the sleeve pipe passes through connecting device and is connected with the slide bar bottom rotation, cup joint in the sleeve pipe and set up two sets of telescopic links, the outer wall of telescopic link sets up spacing piece, set up extrusion spring between spacing piece and the sleeve pipe, all set up horizontal fixed lever on the lateral wall about the sheathed tube, set up the elasticity rope between fixed lever and the telescopic link.
Further, the connecting device comprises a cross rod, the cross rod is fixedly connected with the bottom end of the sliding rod, two groups of cross rod sliding blocks are sleeved on the cross rod, the cross rod sliding blocks are rotatably connected with the supporting rods, the supporting rods are rotatably connected with the outer wall of the sleeve, threaded openings are formed in the top ends of the cross rod sliding blocks, and butterfly bolts are arranged in the threaded openings.
Furthermore, the outer wall of the limiting bearing is fixedly connected with a limiting rod, the limiting rod penetrates through the sliding rod, and a reset spring is sleeved on the limiting rod.
Furthermore, one end, far away from the sleeve, of the telescopic rod is provided with an anti-slip pad, and the outer wall of the fixed rod is evenly sleeved with an anti-slip sleeve.
A method for preventing blockage of a discharging device of an agricultural machinery elevator,
s1: when the elevator transports materials to the outlet end of the elevator, a rotating motor is started, the rotating motor drives a rotating shaft on a disturbance device to rotate, the rotating shaft drives a rotating plate to rotate, the rotating plate can transport the corns in batches, so that the corn cobs fall off from a metal plate, the corn cobs are prevented from being excessively gathered, plant stems and leaves on the corn cobs are prevented from being wound mutually, the corn cobs are caused to block a shell, and the disturbance device arranged at the outlet end is favorable for accelerating the flow of the materials;
s2: the driving shaft rotates to drive the driving wheel to rotate, the driving wheel drives the driven wheel to rotate through the belt, the driven wheel drives the driven shaft to rotate, the cam on the driven shaft continuously rotates, the cam and the round wheel are mutually extruded, the push plate continuously slides left and right under the combined action of the reset spring, the push plate continuously extrudes and collides materials at the outlet of the elevator, vibration is generated, and corn cobs can be prevented from being clamped at corners during conveying;
s3: the utility model discloses a corn cob, including the conveyer belt, the actuating device is used for the corn cob, the stalk and the stalk of corn on the corn cob are often intertwine, make the corn cob tie together, produce the card condition of dying easily, telescopic link and corn cob on the actuating device extrude each other, the extrusion spring provides the extrusion force, the corn cob constantly removes under the transport of conveyer belt, can drive the sleeve pipe and rotate, when the sleeve pipe rotates, the dead lever changes into the vertical state from the horizontal state, at this in-process, the dead lever can push the discharge gate of cavity with the corn cob, make two sets of corn cobs separately around, avoid the bonding that winding such as root hair branch and leaf produced, especially corn silk on the corn cob, can reach the purpose of quick separation.
Compared with the prior art, the invention has the beneficial effects that: the technical scheme provides an anti-blocking discharging device and method for agricultural machine elevator, can pass through the disturbance device, rotating electrical machines and driving shaft combined use, can incessantly carry out the disturbance to the maize of exit and cut apart, make the maize drop, prevent that the maize from blockking up the export, through telescopic link and the dead lever combined use on the actuator, can prevent that the corn-on-cob from being twined, the problem that leads to unable transmission, can also increase the frictional force to the corn-on-cob, reduce the slip, make the corn-on-cob divide batch, the equidistant transportation, reduce export jam pressure, through rotating electrical machines, the cam is used with the push pedal combination, can make the push pedal constantly shake the maize of exit, prevent that excessive jam from causing the export smooth not logical.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of the structure A of the present invention;
FIG. 3 is a schematic view of a perturbation apparatus according to the present invention;
fig. 4 is a schematic diagram of the structure of the actuating device of the invention.
In the figure: 1. a housing; 2. an elevator outlet end; 3. a rotating electric machine; 4. a drive shaft; 5. a perturbation device; 6. a driving wheel; 7. a belt; 8. a driven wheel; 9. a driven shaft; 10. a cam; 11. a round wheel; 12. a slide bar; 13. pushing the plate; 14. a slider; 15. a limiting chute; 16. a limit bearing; 17. a return spring; 18. an actuation device; 19. a metal plate; 501. a rotating shaft; 502. a limiting wheel; 503. a rotating plate; 181. a connecting device; 182. a sleeve; 183. a telescopic rod; 184. a limiting sheet; 185. a compression spring; 186. fixing the rod; 187. an elastic cord; 1811. a cross bar; 1812. a cross bar slider; 1813. a strut; 1814. butterfly bolts.
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
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. 1-4, an anti-blocking discharging device for an agricultural machinery elevator comprises a shell 1, wherein the shell 1 is positioned at an outlet end 2 of the elevator, a rotating motor 3 is arranged in the shell 1, a power output end of the rotating motor 3 is vertically and downwards coaxially connected with a driving shaft 4, a disturbing device 5 is arranged at the bottom end of the driving shaft 4, and the driving shaft 4 drives the disturbing device 5 to operate;
as shown in fig. 2, a driving wheel 6 is sleeved on a driving shaft 4, the driving wheel 6 is connected with a driven wheel 8 through a belt 7, the driven wheel 8 is sleeved on a driven shaft 9, the driven shaft 9 is rotatably connected with the top end of an inner cavity of a shell 1, a cam 10 is sleeved on the driven shaft 9, the outer wall of the cam 10 is contacted with a round wheel 11, the round wheel 11 is sleeved on the outer wall of a vertical sliding rod 12, one end, far away from the cam 10, of the round wheel 11 is connected with a push plate 13 through a connecting rod, the top ends of the sliding rod 12 and the push plate 13 are both fixedly connected with a sliding block 14, a limiting sliding groove 15 mutually matched with the sliding block 14 is formed in the top end of the inner cavity of the shell 1, the limiting sliding groove 15 facilitates the sliding of the sliding block 14 to slide, and when the cam 10 rotates, the round wheel 11 can be extruded, and the round wheel 11 can generate thrust to the push plate 13, so that the push plate can vibrate corn cobs;
as shown in fig. 2, two sets of limit bearings 16 are sleeved on the outer wall of the driven shaft 9, the outer wall of the limit bearing 16 is connected with the sliding rod 12 through a return spring 17, an actuating device 18 is arranged at the bottom end of the sliding rod 12, a metal plate 19 is arranged below the actuating device 18, and the return spring 17 facilitates the sliding rod 12 to be timely reset, so that the circular wheel 11 can be matched with the cam 10 to move left and right.
As shown in fig. 3, the disturbing device 5 includes a rotating shaft 501, a limiting wheel 502 is disposed on the outer wall of the rotating shaft 501, a rotating plate 503 is uniformly disposed on the outer wall of the rotating shaft 501, the top end of the rotating plate 503 is slidably connected with the limiting wheel 502, one half of the bottom end of the limiting wheel 502 is a metal plate 19, the other half is suspended, the rotating motor 3 drives the rotating shaft 501 to rotate, and the rotating plate 503 continuously rotates, so that the corn cobs at the outlet are continuously swept down;
as shown in fig. 4, the actuating device 18 includes a sleeve 182, the sleeve 182 is rotatably connected to the bottom end of the sliding rod 12 through a connecting device 181, two sets of telescopic rods 183 are sleeved in the sleeve 182, a limiting piece 184 is disposed on the outer wall of the telescopic rod 183, an extrusion spring 185 is disposed between the limiting piece 184 and the sleeve 182, horizontal fixing rods 186 are disposed on the left and right side walls of the sleeve 182, an elastic rope 187 is disposed between the fixing rod 186 and the telescopic rod 183, when a corn cob passes through the bottom of the telescopic rod 183 at the bottom end, the extrusion spring 185 extrudes the corn cob, the corn cob continuously moves forward under the continuous pushing of the conveyor belt, and the sleeve 182 is driven to rotate, so that the front and rear corn cobs are divided, and the winding phenomena of vines, corn silks and the like are reduced;
as shown in fig. 4, the connecting device 181 includes a cross bar 1811, the cross bar 1811 is fixedly connected to the bottom end of the sliding rod 12, two sets of cross bar sliding blocks 1812 are sleeved on the cross bar 1811, the cross bar sliding blocks 1812 are both rotatably connected to the supporting rods 1813, the supporting rods 1813 are both rotatably connected to the outer wall of the sleeve 182, a threaded opening is formed at the top end of the cross bar sliding block 1812, a butterfly bolt 1814 is arranged therein, and the cross bar sliding blocks 1812 are slid to change the included angle of the two sets of supporting rods 1813, thereby changing the height of the sleeve 182 and facilitating height adjustment;
as shown in fig. 2, the outer wall of the limiting bearing 16 is fixedly connected with a limiting rod, the limiting rod passes through the sliding rod 12, the limiting rod is sleeved with a return spring 17, and the limiting rod can limit the return spring 17 to prevent the return spring 17 from deviating;
as shown in fig. 4, one end of the telescopic rod 183, which is far away from the casing 182, is provided with a non-slip mat, the outer wall of the fixing rod 186 is uniformly sleeved with a non-slip sleeve, the non-slip mat and the non-slip sleeve are made of rubber, friction between the non-slip mat and the corn can be increased, and invasion of moisture to the telescopic rod 183 and the casing 182 is prevented.
A method for preventing blockage of a discharging device of an agricultural machinery elevator,
s1: when the elevator transports materials to the elevator outlet end 2, the rotating motor 3 is started, the rotating motor 3 drives the rotating shaft 501 on the disturbing device 5 to rotate, the rotating shaft 501 drives the rotating plate 503 to rotate, the rotating plate 503 can transport the corns in batches, so that the corn cobs fall off the metal plate 19, the phenomenon that the corn cobs are excessively gathered and plant stems and leaves on the corn cobs are mutually wound to cause the corn cobs to block the shell 1 is avoided, and the disturbing device 5 arranged at the outlet end is favorable for accelerating the flow of the materials;
s2: the driving shaft 4 rotates to drive the driving wheel 6 to rotate, the driving wheel 6 drives the driven wheel 8 to rotate through the belt 7, the driven wheel 8 drives the driven shaft 9 to rotate, the cam 10 on the driven shaft 9 continuously rotates, the cam 10 and the round wheel 11 are mutually extruded, under the combined action of the reset spring 17, the push plate 13 continuously slides left and right, the push plate 13 continuously extrudes and collides materials at the outlet of the elevator, vibration is generated, and corn cobs can be prevented from being clamped at corners during conveying;
s3: when the cob passes through actuating device 18 bottom, stem leaf on the cob often can intertwine, make the cob knot together, produce the card condition of dying easily, telescopic link 183 on the actuating device 18 extrudees with the cob each other, extrusion spring 185 provides the extrusion force, the cob constantly removes under the transport of conveyer belt, can drive sleeve pipe 182 and rotate, when sleeve pipe 182 rotates, dead lever 186 changes into the vertical state from the horizontal state, in this process, dead lever 186 can push the discharge gate of cavity with the cob, make two sets of cobs in front and back separately, avoid the bonding of winding production such as root hair branch and leaf, especially the corn silk on the cob, can reach the purpose of quickly separating.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.
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 (4)
1. A prevent blockking up discharge device for agricultural machine elevator, includes casing (1), its characterized in that: the lifting device is characterized in that the shell (1) is positioned at an outlet end (2) of the lifting device, a rotating motor (3) is arranged in the shell (1), a power output end of the rotating motor (3) is coaxially connected with a driving shaft (4), a disturbing device (5) is arranged at the bottom end of the driving shaft (4), a driving wheel (6) is sleeved on the driving shaft (4), the driving wheel (6) is connected with a driven wheel (8) through a belt (7), the driven wheel (8) is sleeved on a driven shaft (9), the driven shaft (9) is rotatably connected with the top end of an inner cavity of the shell (1), a cam (10) is sleeved on the driven shaft (9), the outer wall of the cam (10) is in contact with a round wheel (11), the round wheel (11) is sleeved on the outer wall of a vertical sliding rod (12), one end, far away from the cam (10), of the round wheel (11) is connected with a connecting rod push plate (13) through a connecting rod, the top ends of the sliding rod (12) and the push plate (13) are fixedly connected with a sliding block (14), the top end of the inner cavity of the shell (1) is provided with a limiting sliding groove (15) matched with the sliding block (14), the outer wall of the driven shaft (9) is sleeved with two groups of limiting bearings (16), the outer wall of each limiting bearing (16) is connected with the sliding rod (12) through a return spring (17), the bottom end of the sliding rod (12) is provided with an actuating device (18), and a metal plate (19) is arranged below the actuating device (18);
the disturbance device (5) comprises a rotating shaft (501), a limiting wheel (502) is arranged on the outer wall of the rotating shaft (501), rotating plates (503) are uniformly arranged on the outer wall of the rotating shaft (501), the top ends of the rotating plates (503) are connected with the limiting wheel (502) in a sliding mode, one half of the bottom end of the limiting wheel (502) is a metal plate (19), and the other half of the bottom end of the limiting wheel (502) is suspended;
the actuating device (18) comprises a sleeve (182), the sleeve (182) is rotatably connected with the bottom end of the sliding rod (12) through a connecting device (181), two groups of telescopic rods (183) are sleeved in the sleeve (182), the outer walls of the telescopic rods (183) are provided with limiting sheets (184), an extrusion spring (185) is arranged between each limiting sheet (184) and the sleeve (182), horizontal fixing rods (186) are arranged on the left side wall and the right side wall of the sleeve (182), and an elastic rope (187) is arranged between each fixing rod (186) and each telescopic rod (183);
the connecting device (181) comprises a cross bar (1811), the cross bar (1811) is fixedly connected with the bottom end of the sliding rod (12), two sets of cross bar sliding blocks (1812) are sleeved on the cross bar (1811), the cross bar sliding blocks (1812) are rotatably connected with supporting rods (1813), the supporting rods (1813) are rotatably connected with the outer wall of the sleeve (182), threaded openings are formed in the top ends of the cross bar sliding blocks (1812), and butterfly bolts (1814) are arranged in the threaded openings.
2. The anti-jamming discharge device for an agricultural machine elevator according to claim 1, wherein: the outer wall of the limiting bearing (16) is fixedly connected with a limiting rod, the limiting rod penetrates through the sliding rod (12), and a reset spring (17) is sleeved on the limiting rod.
3. The anti-jamming discharge device for an agricultural machine elevator according to claim 1, wherein: the anti-skidding sleeve is evenly sleeved on the outer wall of the fixing rod (186).
4. The method of claim 1 for a jam resistant discharge device for an agricultural machine elevator, wherein:
s1: when the elevator transports materials to the elevator outlet end (2), the rotating motor (3) is started, the rotating motor (3) drives the rotating shaft (501) on the disturbance device (5) to rotate, the rotating shaft (501) drives the rotating plate (503) to rotate, the rotating plate (503) can transport corns in batches, so that corn cobs fall off the metal plate (19), the phenomenon that the corn cobs are excessively gathered and plant stems and leaves on the corn cobs are mutually wound to cause the corn cobs to block the shell (1) is avoided, and the disturbance device (5) is arranged at the outlet end to facilitate acceleration of the flow of the materials;
s2: the driving shaft (4) rotates to drive the driving wheel (6) to rotate, the driving wheel (6) drives the driven wheel (8) to rotate through the belt (7), the driven wheel (8) drives the driven shaft (9) to rotate, the cam (10) on the driven shaft (9) continuously rotates, the cam (10) and the round wheel (11) are mutually extruded, under the combined action of the reset spring (17), the push plate (13) continuously slides left and right, the push plate (13) continuously extrudes and collides materials at the outlet of the elevator to generate vibration, and corn cobs can be prevented from being clamped at corners during conveying;
s3: when the cob passes through actuator (18) bottom, stem leaf on the cob often can the intertwine, make the cob knot together, the easy dead circumstances of card that produces, telescopic link (183) on actuator (18) extrude each other with the cob, extrusion spring (185) provide the extrusion force, the cob constantly removes under the transport of conveyer belt, can drive sleeve pipe (182) and rotate, when sleeve pipe (182) rotate, dead lever (186) change into the vertical state from the horizontality, at this in-process, dead lever (186) can push the discharge gate of cavity with the cob, make two sets of cobs separately around making, avoid the bonding of root hair branch and leaf winding production, reach quick separation's purpose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010688707.1A CN111837644B (en) | 2020-07-16 | 2020-07-16 | Anti-blocking discharging device and method for agricultural machinery elevator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010688707.1A CN111837644B (en) | 2020-07-16 | 2020-07-16 | Anti-blocking discharging device and method for agricultural machinery elevator |
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| CN111837644A CN111837644A (en) | 2020-10-30 |
| CN111837644B true CN111837644B (en) | 2021-11-23 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9084394B2 (en) * | 2013-02-22 | 2015-07-21 | CNH Industrial Canada, LTD | Continuous crop accumulator for agricultural harvesters |
| CN107896623A (en) * | 2017-11-29 | 2018-04-13 | 江苏大学 | A kind of floating type anti-blocking plug energy-saving low-noise intermediate conveying device |
| JP2019050759A (en) * | 2017-09-14 | 2019-04-04 | ヤンマー株式会社 | Combine harvester |
| CN110562673A (en) * | 2019-09-11 | 2019-12-13 | 海南逸盛石化有限公司 | Drying tower convenient to material loading |
| CN210621016U (en) * | 2019-07-18 | 2020-05-26 | 河北欣望精制棉业有限公司 | Raw cotton slag remover convenient to collect raw cotton |
-
2020
- 2020-07-16 CN CN202010688707.1A patent/CN111837644B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9084394B2 (en) * | 2013-02-22 | 2015-07-21 | CNH Industrial Canada, LTD | Continuous crop accumulator for agricultural harvesters |
| JP2019050759A (en) * | 2017-09-14 | 2019-04-04 | ヤンマー株式会社 | Combine harvester |
| CN107896623A (en) * | 2017-11-29 | 2018-04-13 | 江苏大学 | A kind of floating type anti-blocking plug energy-saving low-noise intermediate conveying device |
| CN210621016U (en) * | 2019-07-18 | 2020-05-26 | 河北欣望精制棉业有限公司 | Raw cotton slag remover convenient to collect raw cotton |
| CN110562673A (en) * | 2019-09-11 | 2019-12-13 | 海南逸盛石化有限公司 | Drying tower convenient to material loading |
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