CN102040105B - Flattening machine - Google Patents
Flattening machine Download PDFInfo
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- CN102040105B CN102040105B CN 201010568231 CN201010568231A CN102040105B CN 102040105 B CN102040105 B CN 102040105B CN 201010568231 CN201010568231 CN 201010568231 CN 201010568231 A CN201010568231 A CN 201010568231A CN 102040105 B CN102040105 B CN 102040105B
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Abstract
The invention discloses a flattening machine comprising a rack, a flattening travelling mechanism installed on the rack, a horizontal rotary impeller for flattening goods and a motor for driving the horizontal rotary impeller to rotate, wherein the horizontal rotary impeller is installed on an impeller elevating frame which is driven to elevate by an impeller elevating mechanism installed on the rack. The flattening machine disclosed by the invention is used for flattening bulk goods on a loading vehicle mechanically to replace labor, thereby completely liberating the productivity, improving the flattening efficiency and solving the problem of puzzling bulk goods loading and unloading currently.
Description
Technical field
The present invention relates to a kind of material collating unit, specifically, relate to a kind of for the bulk freight of stacking on the vehicle is carried out smooth flattening machine.
Background technology
When bulk freight being carried out the entrucking transportation, for the consideration of transportation safety, need to highly carry out strict restriction to the stacking of goods.Take cargo train as example, behind railway carriage that bulk freight is packed into, because the requirement of railway security, the goods that fills must be smooth standardized, and namely cargo height must guarantee below safe altitude.At present, the vehicle that only has single user wharf specialty truck-loading facilities to take on could satisfy smooth standardized requirement, and the vehicle that other amateur equipment fill all can't reach the railway requirement, must carry out flatcar and process.And flatcar all is the manpower flatcar basically at present.Because manpower flatcar labour intensity is large, the labour of input is many, and inefficiency, so the flatcar operation has become a present difficult problem that affects bulk handling efficient.
Summary of the invention
The present invention provides a kind of flattening machine in order to solve large, the inefficient problem of manpower flatcar labour intensity, uses machinery to replace manpower to carry out flatcar, to improve flatcar efficient.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of flattening machine comprises frame, is installed on flatcar traveling gear on the frame, is used for shakeouing horizontally rotating impeller and driving the described electrical motor that horizontally rotates vane rotary of goods; The described impeller that horizontally rotates is installed on the impeller crane, and described impeller crane drives its lifting by rack-mounted impeller lifting mechanism.
Wherein, in described flatcar traveling gear, comprise along the flatcar road wheel of the end face of goods carrying vehicle envelope sidewall walking and be used for driving the driver train that described flatcar road wheel rotates.
The anti-bias wheel of flatcar walking of walking along the side wall inner surface of goods carrying vehicle envelope when further, in described flatcar traveling gear, also being included in the flattening machine flatcar.
Further again, in described flattening machine, also be provided with the impeller apparatus for controlling of lifting, described impeller apparatus for controlling of lifting is detecting when horizontally rotating impeller and dropping to setting height, and it is out of service that the output limit signal is controlled described impeller lifting mechanism.
Further, in described impeller apparatus for controlling of lifting, comprise scale, slide block, limit switch and be used for driving the sliding block drive that described slide block moves up and down along scale; Described scale and slide block are arranged on the impeller crane, and limit switch is arranged on the frame, when described limit switch touches slide block in the decline process of impeller crane, produce described limit signal.
Further, the flatcar that is useful on distance between the envelope rear wall that detects frame and goods carrying vehicle in the installed in front of the described frame level sensor of walking; The reversing of distance is to level sensor between the rear side of described frame is equipped with for detection of the envelope antetheca of frame and goods carrying vehicle.
In order to realize flattening machine automatic standdle carrier between the adjacent compartment of two joints, the present invention also is provided with standdle carrier mechanism in described flattening machine, comprise for the supporting leg that lifts described frame when the flattening machine standdle carrier, drive the supporting leg lifting mechanism of described supporting leg lifting and be installed on the standdle carrier road wheel on the described supporting leg and drive the driver train that described standdle carrier road wheel rotates; The length of described supporting leg is greater than the normal separation in goods carrying vehicle two joint compartments.
Further, in described standdle carrier mechanism, also be provided with the standdle carrier deviation correcting device, be installed on the inboard of standdle carrier road wheel, interior survey edge along the standdle carrier road wheel extends outward a circle inclined flange, the medial surface of the outer wall of described inclined flange and standdle carrier road wheel forms 30～60 degree angles, and decision design in angle of 45 degrees.
Further, comprise that in described supporting leg two forward direction supporting legs that stretch to frame the place ahead and two stretch to the rear to supporting leg of frame rear; Be provided with spacing abnormality sensor for detection of two joint compartment spacings at described forward direction supporting leg, be provided with the standdle carrier that whether puts in place for detection of the standdle carrier walking to level sensor to supporting leg afterwards described.
Further, also be provided with diesel powerplant and controller in described flattening machine, each uses the required electric energy of electrical mechanisms described diesel powerplant output; Controller receives telecommand by connected wireless receiving module, and then the generation control command is controlled each actuating unit action.
Compared with prior art, advantage of the present invention and good effect are: flattening machine of the present invention adopts the alternative manpower of machinery to come the bulk freight on the goods carrying vehicle is shakeout processing, thereby thorough liberation productive force, improved flatcar efficient, solved a difficult problem that perplexs present bulk handling.
After reading by reference to the accompanying drawings the detailed description of embodiment of the present invention, other characteristics of the present invention and advantage will become clearer.
Description of drawings
Fig. 1 is the flatcar walking states figure of flattening machine proposed by the invention;
Fig. 2 is the right elevation after Fig. 1 omits standdle carrier mechanism;
Fig. 3 is the standdle carrier walking states figure of flattening machine proposed by the invention;
Fig. 4 is the right elevation of Fig. 3.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
Embodiment one, referring to shown in Figure 1, the flattening machine of the present embodiment mainly by frame 1, flatcar traveling gear, horizontally rotate impeller 10 and be used for to drive the electrical motor that horizontally rotates impeller 10 rotations and form.Wherein, the flatcar traveling gear is installed on the frame 1, can form by the flatcar road wheel 8 that is installed on frame 1 bottom surface and for the driver train that drives described flatcar road wheel 8 rotations.Described flatcar road wheel 8 preferably arranges 4, two front sides that are installed in frame 1 wherein, two other is installed in the rear side of frame 1, with flattening machine direction of travel definition four orientation, front, rear, left and right, mark as shown in Figure 1 and Figure 2 (for the purpose of sake of clarity, having omitted the part assembly in the standdle carrier mechanism among Fig. 2).Distance between the left and right sides flatcar road wheel 8 is carried out choose reasonable, make the envelope width of itself and goods carrying vehicle suitable, thereby when the flattening machine flatcar, make the flatcar road wheel 8 just can be along the end face 36-1 walking of goods carrying vehicle envelope sidewall 36.The width of described flatcar road wheel 8 preferably is wider than the end face 36-1 width of railroad car lateral wall 36, as shown in Figure 2, and to improve the stability of flattening machine flatcar walking.
Horizontally rotate the bulk freight that impeller 10 is used for shakeouing car body top, be installed on the impeller crane 4, as shown in Figure 1, impeller crane 4 drives its lifting by the impeller lifting mechanism 3 that is installed on the frame 1.Described impeller lifting mechanism 3 can be designed to spiral lifting mechanism, by its rotation and lifting of motor-driven.When the flattening machine flatcar, described impeller lifting mechanism 3 drives impeller cranes 4 descend, so make horizontally rotate impeller 10 and arrive suitable height after, begin to rotate flatcar by primer fluid pressure motor 13 control impellers.
In the outside of described impeller crane 4 roller 37 is installed, in the process of impeller crane 4 liftings, roller 37 is in frame 1 walking, can avoid on the one hand impeller crane 4 and frame 1 directly to contact and produce excessive friction force, can improve on the other hand the degree of stability of impeller crane 4 in lifting process.
Around horizontally rotating impeller 10, backgauge strike-off stick 16 can also be installed, as shown in Figure 1, described backgauge strike-off stick 16 can only be installed in left and right both sides and the back that horizontally rotates impeller 10, front (namely towards flattening machine working direction one side) can be installed also and can not installed, in the time of can avoiding thus horizontally rotating impeller 10 rotary flat goods, because the effect of centnifugal force is seriously got rid of to both sides, compartment or rear goods.
In the driver train that drives 8 walkings of flatcar road wheel, can comprise HM Hydraulic Motor 17, drive the rotating shaft 18 of rotation and be sleeved on the power wheel 12 that drives its rotation in the rotating shaft 18, by rotating shaft 18 by HM Hydraulic Motor 17, as shown in Figure 2.Described power wheel 12 drives flatcar road wheel 8 by chain 19 and rotates walking.Certainly, above-mentioned only is wherein a kind of design of described driver train, and the present embodiment is not limited in above giving an example.
The end face 36-1 that can not depart from railroad car lateral wall when guaranteeing that flattening machine is walked in the compartment, the present embodiment are designed with further also in described flatcar traveling gear that the flatcar walking is anti-bias takes turns 9, as shown in Figure 2.Described anti-bias 9 side-lowers that are positioned at flatcar road wheel 8 of taking turns, be fixed on the frame 1 by fixed mount 20, preferably all install one in the inboard of each flatcar road wheel 8 and anti-biasly take turns 9, when flatcar road wheel 8 during in the end face 36-1 of railroad car lateral wall walking, anti-biasly take turns 9 just along the walking of the inner face of railroad car lateral wall, to prevent flatcar road wheel 8 the sideslip faults occur.
In order to locate horizontally rotating transferring highly accurately of impeller 10, the present embodiment has also designed impeller apparatus for controlling of lifting 14 in flattening machine.By impeller apparatus for controlling of lifting 14 can detection level rotary blade 10 transfer height, when dropping to setting height, output limit signal control impeller lifting mechanism 3 is out of service, and then makes and horizontally rotate impeller 10 and just rest on the desired height.As preferred embodiment a kind of, the present embodiment can accepted scale, slide block, limit switch and being used for drives the sliding block drive that described slide block moves up and down along scale and make up described impeller apparatus for controlling of lifting.Described scale and slide block are installed on the impeller crane 4, and limit switch is installed on the frame 1.Before flattening machine begins flatcar, at first according to 14 actions of flatcar height control impeller apparatus for controlling of lifting, and then move to movable slider on the suitable scale of scale; Then start 3 operations of impeller lifting mechanism, drives impeller crane 4 is transferred.In the process of transferring, when slide block touches limit switch, limit switch changes its virgin state, and then the controller on the notice flattening machine is transferred and is put in place, this Time Controller output limit signal, control impeller lifting mechanism 3 is out of service, makes to horizontally rotate impeller 10 and rest on the desired flatcar height.Because design herein, those skilled in the art are easy to associate practical structures by above-mentioned text description, and are therefore not shown in the drawings.
In the present embodiment, described impeller apparatus for controlling of lifting 14 can adopt the motor-driven leading screw flexible, and then the mode of drive slider displacement designs realization.Certainly, the also height of adjusting slider manually, the present embodiment be not limited in above for example.
Be mounted with simultaneously the goods carrying vehicle in more piece compartment for train etc., in order to allow flattening machine behind the complete joint compartment of flatcar, can automatically run to next joint compartment and continue flatcar, the present embodiment has also designed standdle carrier mechanism in described flattening machine, as shown in Figure 1.Described standdle carrier mechanism is by supporting leg 6, supporting leg lifting mechanism 5, standdle carrier road wheel 7 and drive driver train that described standdle carrier road wheel 7 rotates etc. and partly form.Wherein, described supporting leg 6 preferably arranges 4, and two the place aheads of stretching to frame 1 are called forward direction supporting leg 6-1, and two rears of stretching to frame 1 are called backward supporting leg 6-2, and its length all should be greater than the normal separation in goods carrying vehicle two joint compartments.One end of supporting leg 6 is fixed on the frame 1 by rotating shaft 21, and the other end is installed standdle carrier road wheel 7.Supporting leg lifting mechanism 5 can be selected hydraulic actuating cylinder, and piston end is installed on the supporting leg 6 by rotating shaft 22, and the other end is fixed on the frame 1 by rotating shaft 23.When the walk end in compartment, current place of flattening machine, when needing standdle carrier, it is out of service that controller is at first controlled the flatcar traveling gear, packs up to horizontally rotate impeller 10; Then control 5 actions of supporting leg lifting mechanism, supporting leg 6 is put down.At this moment, forward direction supporting leg 6-1 just is cross on next joint compartment, backward supporting leg 6-2 still rests on front compartment, frame 1 is lifted under the supporting role of supporting leg 6, rotate by driving mechanisms control standdle carrier road wheel 7, carry out the standdle carrier walking, referring to shown in Figure 3, and then whole frame 1 transferred to next save on compartment.When flatcar road wheel 8 is all transferred on the rear joint compartment, 7 stalls of controller control standdle carrier road wheel, flattening machine stops; Then supporting leg 6 is packed up in 5 actions of controller control supporting leg lifting mechanism, puts down support 1, and then flatcar road wheel 8 is just transferred on the sidewall end face 36-1 in next joint compartment, finishes the standdle carrier walking process.After this, controller is again controlled impeller lifting mechanism 3 and is put down and horizontally rotate impeller 10, then controls flatcar road wheel 8 and rotates walking, begins the goods in next joint compartment is shakeout operation.
Comprise that at described driver train for driving 7 rotations of standdle carrier road wheel HM Hydraulic Motor 17, HM Hydraulic Motor 17 drive power wheel 26 rotations by chain transmission mode, power wheel 26 is by two the standdle carrier road wheels 7 rotation walkings of rotating shaft 25 drive installations on forward direction supporting leg 6-1.Certainly, the present embodiment is not limited in above design for described driver train.
In order to make the position that flattening machine can compartment, automatic sensing self place, the present embodiment has been installed standdle carrier walk to level sensor 31, reversing to level sensor 32, flatcar level sensor 33 and spacing abnormality sensor 34 at flattening machine, as shown in Figure 1.Wherein, described standdle carrier is preferably mounted on the backward supporting leg 6-2 to level sensor 31; Reversing is preferably mounted at the rear side of frame 1 to level sensor 32; The flatcar level sensor 33 of walking is preferably mounted at the front side of frame 1; Spacing abnormality sensor 34 is preferably mounted on the forward direction supporting leg 6-1.When flattening machine begins that the first segment compartment carried out the flatcar operation, at first by the distance between the envelope antetheca of move backward level sensor 32 detection frames 1 and goods carrying vehicle, to judge whether flattening machine is positioned at the initiating terminal in compartment, if not, then flattening machine reversing, until after controller receives the alarm signal that reversing sends to level sensor 32, stop to move backward.With the Reverse Sensor on the present vehicle, the present embodiment is not done too much explanation at this to the principle of work of level sensor 32 in described reversing.Flatcar is walked level sensor 33 for detection of the distance between the envelope rear wall of frame 1 and goods carrying vehicle, and when flattening machine walking arrived compartment terminal, the flatcar level sensor 33 of walking can send induced signal to controller, and then the control car load stops.In order to prevent that train from taking off row, namely adjacent two joint compartment spacings are unusual, or flattening machine work is to the final section compartment, ad hoc spacing abnormality sensor 34, and flattening machine can quit work automatically when running into above situation.If the spacing in two joint compartments is normal, then controller is controlled the walking of flattening machine standdle carrier automatically.In the process of flattening machine standdle carrier walking, standdle carrier detects walking position in real time to level sensor 31, after arriving the desired location, after being the distance arrival setpoint distance of backward supporting leg 6-2 and compartment rear wall, output signal to controller, stop with the control flattening machine, pack up supporting leg 6, put down flatcar road wheel 8, begin next joint compartment is carried out the flatcar operation.
Certainly, for concrete installation site the present embodiment of each sensor be not limited in above for example, also can select on the flattening machine other suitable positions to install according to self function of each sensor.
In order to prevent that flattening machine from departing from the compartment when standdle carrier is walked, the present embodiment also is provided with standdle carrier deviation correcting device 11 in described standdle carrier mechanism, as shown in Figure 4, be installed in the inboard of standdle carrier road wheel 7, interior survey edge along standdle carrier road wheel 7 extends outward a circle inclined flange, be similar bottomless bowl-shape, the medial surface of the outer wall of described inclined flange and standdle carrier road wheel 7 forms certain angle α.Described angle α can be arranged between 30～60 degree, and decision design in angle of 45 degrees.
On the basis of standdle carrier deviation correcting device 11, bend standdle carrier correct equipment 15 can also be set further, as shown in Figure 4, namely be positioned at the outside of standdle carrier deviation correcting device 11, and the swash plate parallel with the inclined flange of standdle carrier deviation correcting device 11, namely the medial surface angle of the outer wall of described swash plate and standdle carrier road wheel 7 also is α.When flattening machine need to carry out standdle carrier when walking at railroad curve, if standdle carrier road wheel 7 departs from the end face 36-1 of railroad car lateral wall, then bend standdle carrier correct equipment 15 can correct the standdle carrier road wheel 7 that departs from, and makes it normally carry out the standdle carrier operation.
The overall workflow of flattening machine is: at first flattening machine is placed into the starting end that needs the goods carrying vehicle of flatcar envelope with crane or fork truck, remote control starts diesel powerplant 2 and remote circuit closes a floodgate.Then, according to entrucking line size, remote control control impeller apparatus for controlling of lifting 14 moves to suitable position with slide block, then begins the flatcar operation.The job order of intelligence flattening machine is for from left to right.Permutation railway carriage left end is the flatcar starting end, and at this moment flattening machine can begin reversing according to programming control, reaches behind the desired location reversing and sends instruction to level sensor 32, stops reversing, begins to work.At this moment, controller control horizontally rotates impeller 10 and descends, vane rotary after three seconds, reach predetermined altitude after flatcar road wheel 8 begin rotation, flatcar walking to the right.In the flatcar process, when goods mostly occurred stall, flattening machine can horizontally rotate impeller 10 at the following working edge automatic lifting of programming control, makes to horizontally rotate the minimizing of impeller 10 pickings, recovers normal, then transfers to desired location and continues flatcar.When flattening machine arrives the compartment when terminal, the flatcar level sensor 33 of walking is issued to bit instruction, stops walking by controller control flatcar road wheel 8.Horizontally rotate impeller 10 and rise, front and back supporting leg 6 descends synchronously.After supporting leg 6 declines put in place, standdle carrier road wheel 7 was under the effect of driver train, and the beginning standdle carrier is walked.After the standdle carrier walking put in place, standdle carrier sent instruction to level sensor 31, and controller control standdle carrier road wheel 7 stops, and front and back supporting leg 6 rises synchronously.Horizontally rotate impeller 10 and again descend, the flatcar work in beginning second section compartment.Go round and begin again, a compartment connects a compartment, until spacing abnormality sensor 34 is when detecting the place ahead without car, and the flattening machine auto-stop.At this moment, with crane or fork truck flattening machine is taken off, flatcar is finished.
Certainly, the above only is a kind of preferred implementation of the present invention, should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. flattening machine is characterized in that: comprise frame, be installed on flatcar traveling gear on the frame, be used for shakeouing horizontally rotating impeller and driving the described electrical motor that horizontally rotates vane rotary of goods; The described impeller that horizontally rotates is installed on the impeller crane, and described impeller crane drives its lifting by rack-mounted impeller lifting mechanism; In described flattening machine, also be provided with standdle carrier mechanism, comprise supporting leg, be installed on the standdle carrier road wheel on the described supporting leg, the driver train that the described standdle carrier road wheel of driving rotates and the supporting leg lifting mechanism that is used for driving described supporting leg lifting; Described supporting leg lifting mechanism is installed on the frame by rotating shaft; The length of described supporting leg is greater than the normal separation in goods carrying vehicle two joint compartments; Comprise that in described supporting leg two forward direction supporting legs that stretch to frame the place ahead and two stretch to the rear to supporting leg of frame rear; Be provided with spacing abnormality sensor for detection of two joint compartment spacings at described forward direction supporting leg, be provided with the standdle carrier that whether puts in place for detection of the standdle carrier walking to level sensor to supporting leg afterwards described; The flatcar that is useful on distance between the envelope rear wall that detects frame and goods carrying vehicle in the installed in front of the described frame level sensor of walking; The reversing of distance is to level sensor between the rear side of described frame is equipped with for detection of the envelope antetheca of frame and goods carrying vehicle.
2. flattening machine according to claim 1 is characterized in that: comprise along the flatcar road wheel of the end face walking of goods carrying vehicle envelope sidewall in described flatcar traveling gear and be used for driving the driver train that described flatcar road wheel rotates.
3. flattening machine according to claim 2 is characterized in that: the anti-bias wheel of flatcar walking of walking along the side wall inner surface of goods carrying vehicle envelope when also being included in the flattening machine flatcar in described flatcar traveling gear.
4. flattening machine according to claim 1, it is characterized in that: in described flattening machine, also be provided with the impeller apparatus for controlling of lifting, described impeller apparatus for controlling of lifting is detecting when horizontally rotating impeller and dropping to setting height, and it is out of service that the output limit signal is controlled described impeller lifting mechanism.
5. flattening machine according to claim 4 is characterized in that: comprise scale, slide block, limit switch and be used for driving the sliding block drive that described slide block moves up and down along scale in described impeller apparatus for controlling of lifting; Described scale and slide block are arranged on the impeller crane, and limit switch is arranged on the frame, when described limit switch touches slide block in the decline process of impeller crane, produce described limit signal.
6. each described flattening machine in 5 according to claim 1, it is characterized in that: in described standdle carrier mechanism, also be provided with the standdle carrier deviation correcting device, be installed on the inboard of standdle carrier road wheel, inside edge along the standdle carrier road wheel extends outward a circle inclined flange, and the medial surface of the outer wall of described inclined flange and standdle carrier road wheel forms 30～60 degree angles.
7. each described flattening machine in 5 according to claim 1 is characterized in that: in described flattening machine, also be provided with diesel powerplant and controller, described diesel powerplant output each with the required electric energy of electrical mechanisms; Controller receives telecommand by connected wireless receiving module, and then the generation control command is controlled each actuating unit action.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010568231 CN102040105B (en) | 2010-11-19 | 2010-11-19 | Flattening machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010568231 CN102040105B (en) | 2010-11-19 | 2010-11-19 | Flattening machine |
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| CN102040105A CN102040105A (en) | 2011-05-04 |
| CN102040105B true CN102040105B (en) | 2013-02-13 |
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| CN 201010568231 Active CN102040105B (en) | 2010-11-19 | 2010-11-19 | Flattening machine |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102616585A (en) * | 2012-04-20 | 2012-08-01 | 厦门金华厦工程机械有限公司 | Bulk freight leveler |
| CN103738748B (en) * | 2013-12-23 | 2016-01-20 | 武汉开锐海洋起重技术有限公司 | A kind of flow-type high-efficiency helical puts down material machine |
| CN103803313B (en) * | 2014-02-28 | 2016-03-09 | 天地科技股份有限公司 | A kind of active flat materials device of full automaticity and method |
| CN105129459B (en) * | 2015-07-31 | 2017-04-19 | 江苏南大紫金锂电智能装备有限公司 | Profiling flattening device |
| CN106927278A (en) * | 2015-09-17 | 2017-07-07 | 成都明日星辰科技有限公司 | A kind of cargo train bulk material is compacted flattening device |
| CN105600518B (en) * | 2015-10-22 | 2017-09-08 | 中冶焦耐工程技术有限公司 | A kind of coal leveling device and flat coal method |
| CN105546963A (en) * | 2015-12-17 | 2016-05-04 | 李秋芬 | Energy-saving grain dryer |
| CN108861677B (en) * | 2018-05-03 | 2019-11-19 | 江西中烟工业有限责任公司 | A kind of tobacco storage device with flat-top function |
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| CN201864359U (en) * | 2010-11-19 | 2011-06-15 | 青岛港（集团）有限公司 | Flattening machine |
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| JPH04251708A (en) * | 1991-01-28 | 1992-09-08 | Yamaha Corp | Recovery box provided with leveling mechanism |
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| GB2083432A (en) * | 1980-09-12 | 1982-03-24 | Os Bad Rozwojowy Syst Mech | Device for guiding a meter over and levelling a moving layer of loose material |
| CN1095685A (en) * | 1993-01-22 | 1994-11-30 | 汝克拉公司 | Bulk material leveling apparatus |
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