CN108516450B - Method for quickly replacing large skip bucket of coal mine - Google Patents
Method for quickly replacing large skip bucket of coal mine Download PDFInfo
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- CN108516450B CN108516450B CN201810353507.3A CN201810353507A CN108516450B CN 108516450 B CN108516450 B CN 108516450B CN 201810353507 A CN201810353507 A CN 201810353507A CN 108516450 B CN108516450 B CN 108516450B
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- skip
- movable sleeve
- sleeve frame
- flat car
- upper body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B19/00—Mining-hoist operation
- B66B19/04—Installing or removing mining-hoist cars, cages, or skips
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- Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
Abstract
The invention relates to the field of skip devices, in particular to a method for quickly replacing a large skip of a coal mine, which comprises the steps of respectively transporting an upper body and a lower body of the skip in and out by disassembling a middle flange of the skip, reducing the height of a first layer of wellhead room and the height of a jacket frame in and out of the skip, arranging an open-close type movable jacket frame, integrally opening and closing the jacket frame and a cage guide, reducing the difficulty and workload of dismounting and mounting recovery of the jacket frame, storing a spare skip in a warehouse, canceling storage in the wellhead room or a derrick, reducing the occupied area and load of the wellhead room or the derrick and hoisting equipment, reserving a temporary rail mounting beam during design of the jacket frame, connecting the temporary rail with a fixed rail outside the jacket frame, and quickly mounting a temporary rail during replacement of the skip; the track is laid out of the well tower, so that the skip bucket in the well tower is prevented from being transported, the action is smooth, and the links are few; the technical defects of high cost, large occupied area and overlong consumed time in the prior art are overcome. The invention provides a quick and simple, low-cost and practical method for quickly replacing a large-scale skip bucket in a coal mine.
Description
Technical Field
The invention relates to the field of skip bucket devices, in particular to a method for quickly replacing a large skip bucket of a coal mine.
Background
With the successive emergence of super-huge mines with production capacity over ten million tons and adopting a vertical shaft development mode, the load-carrying volume exceeds 40m3The use of the oversize skip is increasing. According to practical use experience, the service life of the oversize skip is about 2 years, and the skip is relatively frequently replaced. Because the oversize skip buckets (the upper and lower split structures are connected through the flange bolts) have much larger self weight and appearance size compared with the middle and small skip buckets. The traditional standby skip is stored and hung in a wellhead room, the space and load of the wellhead room (a well tower) have to be increased for realizing the purpose, partial metal supporting structures such as a wellhead sleeve frame and the like need to be removed before the skip is replaced, and hoisting machinery arranged for storing the skip in the wellhead room is added. Taking a main vertical shaft lifting system of a certain mine as an example, the adopted lifting system has a 50-ton skip bucket with the self weight of about 57 tons and a 2-section split structure, and the overall height exceeds 21 meters. According to the traditional design scheme, a standby skip is suspended on a main shaft tower or a wellhead house in a segmented manner, and the load of a local floor of the main shaft tower or the wellhead house is increased by over 57 tons; the wellhead sleeve needs to be disassembled to a certain height in the direction of replacing one side of the skipSteel structural members and cage guides within a range exceeding 15 meters; a set of hoisting transportation means is required in the derrick to move the skip from a stand-by position to the vicinity of the wellhead cradle. The method increases the fixed load of the derrick or the wellhead room, and has high civil engineering cost; a large number of steel frame structures of the jacket frame need to be disassembled, the disassembling operation time is long, the installation recovery time is also long, the operation is complicated, and the labor is consumed; the well tower has narrow space, inconvenient reloading and transportation in the well tower and poor operation effect.
Disclosure of Invention
Aiming at the technical defects of high cost, large occupied area and overlong time consumption in the prior art. The invention provides a novel method for quickly replacing a large coal mine skip, which has the advantages of quickness, simplicity, low cost and practicability.
The purpose of the invention is realized by the following technical scheme:
a method for quickly replacing a large skip of a coal mine comprises the following steps:
s1: before the skip is replaced, a temporary track is arranged in a movable sleeve frame arranged at a wellhead, a track is arranged outside the movable sleeve frame, and the temporary track is connected with the track;
s2: lifting an old skip to be replaced to a proper position of a well head by using a lifting device, unfastening a head rope and a tail rope of the skip and fixing the head rope and the tail rope, opening a movable sleeve frame, pushing the flat car into the movable sleeve frame, and placing the old skip on the flat car and fixing the old skip;
s3: detaching a connecting bolt on a middle flange connecting the skip upper body and the skip lower body to separate the skip upper body and the skip lower body, lifting the skip upper body by a lifting device to separate the skip upper body from the flat car, leaving the skip lower body on the flat car, transporting the flat car loaded with the skip lower body out of a wellhead house along a track, and unloading the skip lower body; pushing the flat car back into the sleeve frame, lowering the temporary hoisting device, placing the skip upper body on the flat car, unfastening the suspension rope, transporting the flat car carrying the skip upper body out of the wellhead room, and completing the moving-out of the old skip;
s4: the skip upper part of a new skip is placed on the flat car, the skip upper part is transported into the movable jacket frame through the track outside the movable jacket frame and the temporary track in the movable jacket frame, the skip upper part is lifted and separated from the flat car by the aid of the lifting device 1, the skip lower part is transported into the movable jacket frame through the flat car, then the skip upper part is placed, the skip upper part and the skip lower part are butted through an intermediate flange and fastened through bolts, then the new skip is lifted by the lifting device, the flat car is moved out, the opening-closing type movable jacket frame is closed, a first rope and a tail rope of the fixed skip are fixed, and skip replacement is completed.
As a further improvement, the hoisting device is hung on a temporary hoisting beam, and the temporary hoisting beam is detachably arranged at the top end of the movable sleeve frame.
As a further improvement, the skip comprises a skip upper body and a skip lower body, and the skip upper body and the skip lower body are connected through an intermediate flange.
As a further improvement, the movable sleeve frame is arranged at a well mouth and comprises a left part of the movable sleeve frame, a right part of the movable sleeve frame, a stand column and a hinge, wherein the stand column is connected with the right part of the movable sleeve frame through a bolt, the left part and the right part of the movable sleeve frame are in bilateral symmetry, the hinge is arranged on two sides of the movable sleeve frame, the bolt between the stand column and the movable sleeve frame is detached, and the left part and the right part of the movable sleeve frame are opened in a rotating mode so that the whole door type movable sleeve frame can be opened in a rotating mode.
As a further improvement, the movable sleeve frame is 0-90 degrees along the rotation direction of the hinge.
As a further improvement, the hinge comprises an upper hinge and a lower hinge, the upper hinge is arranged on the upper portion of the side face of the movable sleeve frame, the lower hinge is arranged on the lower portion of the side face of the movable sleeve frame, and a thrust cylindrical roller bearing is arranged on a pin shaft of the lower hinge.
As a further improvement, the temporary track is detachably connected with the track through a fishplate.
Compared with the prior art, the invention has the beneficial effects that:
the integral type replacement is adopted in the traditional skip installation method, so that in order to realize the skip in and out, the height of a first layer of well head room or a well tower and the disassembly height of a jacket frame are high, the upper body and the lower body of the skip are respectively transported in and out by disassembling a middle flange of the skip, the height of the first layer of well head room and the height of the jacket frame in and out of the skip are reduced, and the civil engineering cost is saved;
the novel movable sleeve frame has the advantages that the sleeve frame beam and the cage guide are designed in a split mode in the traditional installation method, the sleeve frame beam and the cage guide are independently disassembled and assembled, the disassembling and assembling workload is large, the sleeve frame and the cage guide are integrally opened and closed by the aid of the openable movable sleeve frame, the difficulty and the workload of disassembling and assembling recovery of the sleeve frame are reduced, independent disassembling and assembling of the sleeve frame beam and the cage guide are avoided, the disassembling and assembling workload is reduced, the assembling precision is improved, the operation is simple, and the use is convenient;
the method has the advantages that the skip bucket is hung in a wellhead house or a derrick through a lifting beam, the skip bucket needs to be transported or changed when entering a casing frame, the indoor space is small, the operability is poor, the links are multiple, the stress of the wellhead house is large, and the occupied area is large;
the standby skip is stored in the storehouse, the normally-arranged hoisting equipment for replacing the skip in the wellhead house (or a derrick) is eliminated, and the equipment investment is reduced; the standby skip is replaced outside the well tower, so that the load and the occupied area of a wellhead room or the well tower are reduced; the spare skip is transported to enter the shaft by adopting a rail, so that the spare skip is simple in transportation mode, reliable in guiding and high in position precision after entering the shaft.
Drawings
FIG. 1 is a schematic view of the overall structure of the present embodiment;
FIG. 2 is a schematic diagram of the inner and outer rail structures of the jacket;
FIG. 3 is a schematic view of a movable frame;
in the figure, 1-a hoisting device, 2-a movable sleeve frame, 3-a skip upper body, 4-a skip lower body, 5-a flat car, 6-a temporary rail, 7-a rail, 8-a movable sleeve frame left part, 9-a movable sleeve frame right part, 10-a stand column, 11-an upper hinge, 12-a lower hinge and 13-a temporary hoisting beam.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Examples
Taking a main vertical shaft lifting system of a certain mine as an example, the adopted lifting system has a 50-ton skip bucket with the self weight of about 57 tons and a 2-section split structure, and the overall height exceeds 21 meters. The traditional design scheme is that a standby skip bucket is suspended on one floor of a main shaft derrick in a segmented mode, and the local floor load of the main shaft derrick is increased by over 57 tons; the well head sleeve frame needs to disassemble the steel structural part and the cage guide with the height exceeding 15 meters in the direction of one side of the skip to be replaced; a set of hoisting transportation means is required in the derrick to move the skip from a stand-by position to the vicinity of the wellhead cradle. The method increases the fixed load of the well tower, and has high civil engineering cost; a large number of steel frame structures of the jacket frame need to be disassembled, the disassembling operation time is long, the installation recovery time is also long, the operation is complicated, and the labor is consumed; the well tower has narrow space, inconvenient reloading and transportation in the well tower and poor operation effect.
The embodiment provides a method for quickly replacing a large-scale skip in a coal mine, as shown in fig. 1 and fig. 3, the movable sleeve frame 2 is arranged at a well mouth, the movable sleeve frame comprises a movable sleeve frame left part 11, a movable sleeve frame right part 12, a stand column 13 and a hinge, the stand column 13 is detachably connected with the movable sleeve frame left part 11 and the movable sleeve frame right part 12 through bolts, the movable sleeve frame left part 11 and the movable sleeve frame right part 12 are bilaterally symmetrical, the hinge is arranged on two sides of the movable sleeve frame 2, when the skip does not need to be replaced, the stand column 5 is vertically arranged between the movable sleeve frame left part 11 and the movable sleeve frame right part 12, and the movable cage guide sleeve frames on the two sides are connected together through the bolts; when the skip bucket needs to be replaced, the connecting bolt is taken down, and the movable sleeve frame can be opened; when in replacement, the two sides of the movable sleeve frame are opened to be opened in opposite directions, and the door type movable sleeve frame is 0-90 degrees along the rotation direction of the hinge; the hinge includes hinge 14 and lower hinge 15, goes up hinge 14 and sets up on the side upper portion of activity cover frame, and lower hinge 15 sets up the side lower part at the activity cover frame, is provided with thrust cylindrical roller bearing on the round pin axle of lower hinge 15, goes up the hinge and only receives the circumference power and makes the activity cover frame keep upright state when rotating under the round pin axle restraint, and the heavy load and the vibration load that bear that the hinge can be relaxed down have satisfied the use of large-scale colliery cover frame. A temporary hoisting beam 16 is arranged at a proper position on the movable sleeve frame 2, a temporary hoisting device 1 is suspended on the temporary hoisting beam 16, and the skip is hoisted through the temporary hoisting device to replace the skip; the movable sleeve frame 2 can integrally open or close the sleeve frame beam and the cage guide; the skip comprises a skip upper body 3 and a skip lower body 4, and the skip upper body 3 and the skip lower body 4 are connected through an intermediate flange.
Before the skip is changed, set up interim track 6 in the activity set frame that the well head set up, activity set frame is provided with track 7 outward, interim track 6 and track 7 interconnect, interim track 6 and set frame outer rail 7 in well head plane department installation set frame can make heavy transport flat car along the track business turn over set frame in, set frame outer rail 7 lay when the skip is changed temporarily also can be fixed lay outside set frame, do not do here and describe repeatedly. Then, the movable sleeve frame 2 is opened, the flat car 5 is pushed into the movable sleeve frame 2, an old skip to be replaced is lifted to a proper position of a well head by the hoisting device 1, a head rope and a tail rope of the skip are untied and fixed, and then the old skip is placed on the flat car 5; disconnecting a connecting bolt on a middle flange for connecting the skip upper body 3 and the skip lower body 4 to separate the skip upper body 3 from the skip lower body 4, lifting the skip upper body 3 by a lifting device to separate the skip upper body from the flat car 5, leaving the skip lower body 4 on the flat car 5, transporting the flat car 5 loaded with the skip lower body 4 out of a wellhead along a track, and unloading the skip lower body 4; pushing the flat car 5 back into the jacket frame, lowering the temporary hoisting device 1, placing the skip upper body 3 on the flat car 5, unfastening the suspension rope, transporting the flat car 5 loaded with the skip upper body 3 out of the wellhead room, and completing the moving-out of the old skip; the new skip upper body stored on the hanging beam of the warehouse is hoisted to the position near a wellhead house by a truck, the skip upper body of the new skip is placed on the flat car 5, the skip bucket is transported into the movable jacket frame through a track 7 outside the movable jacket frame 2 and a temporary track 6 inside the movable jacket frame 2, the skip bucket upper body is lifted by the hoisting device 1 to be separated from the flat car 5 to a proper position, and then the skip bucket lower body is transported into the movable jacket frame 2 through the flat car 5, then the upper skip body is lowered down, the upper skip body and the lower skip body are butted through the middle flange and then are connected and fastened through bolts, then the hoisting device 1 hoists the new skip, moves out of the flat car 5, closes the movable sleeve frame 2, fixes the head rope and the tail rope of the skip to finish the skip replacement, the upper body and the lower body of the skip are respectively transported in and out by disassembling the intermediate flange of the skip, so that the height of the first layer of wellhead room and the height of the jacket frame in and out of the skip are reduced. The invention can reduce the first layer height of a well head room and the height required by the skip when the skip enters and exits the casing frame, thereby saving the civil engineering cost; the movable sleeve frame and the cage guide are integrally opened and closed, the sleeve frame beam and the cage guide are prevented from being independently disassembled and assembled, the disassembling and assembling workload is reduced, the assembling precision is improved, the operation is simple, and the use is convenient; the standby skip is stored in the storehouse, so that the normally-arranged hoisting equipment for replacing the skip in the wellhead house is omitted, and the equipment investment is reduced; the spare skip is replaced outside the well tower, so that the load and the floor area of a well head room are reduced; the transportation mode of reserve skip adopts the track to carry and gets into the pit shaft, and the transportation mode is simple, and the direction is reliable, and the position precision is high after getting into the pit shaft, the skip equipment of being convenient for.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A method for quickly replacing a large skip of a coal mine is characterized by comprising the following steps:
s1: before the skip is replaced, a temporary track (6) is arranged in a movable sleeve frame arranged at a wellhead, a track (7) is arranged outside the movable sleeve frame, the temporary track (6) is connected with the track (7), and the upper track surface of the track (7) is flush with the ground;
s2: lifting an old skip to be replaced to a proper position of a well head by using a lifting device (1), unfastening a head rope and a tail rope of the skip and fixing, opening a movable sleeve frame (2), pushing a flat car (5) into the movable sleeve frame (2), and placing the old skip on the flat car (5) and fixing;
s3: disconnecting a connecting bolt on a middle flange for connecting the skip upper body (3) and the skip lower body (4) to separate the skip upper body (3) from the skip lower body (4), lifting the skip upper body (3) by a lifting device to separate the skip upper body from the flat car (5), leaving the skip lower body (4) on the flat car (5), transporting the flat car (5) loaded with the skip lower body (4) out of a well head room along a track, and unloading the skip lower body (4); pushing the flat car (5) back into the sleeve frame, lowering the temporary hoisting device (1), placing the skip upper body (3) on the flat car (5), unfastening the suspension rope, transporting the flat car (5) loaded with the skip upper body (3) out of the wellhead room, and completing the moving out of the old skip;
s4: the skip upper body of a new skip is placed on a flat car (5), the skip upper body is transported into a movable sleeve frame through a track (7) and a temporary track (6), the skip upper body is lifted and separated from the flat car (5) by using a lifting device (1), the skip lower body is transported into the movable sleeve frame (2) through the flat car (5), then the skip upper body is lowered, the skip upper body and the skip lower body are butted through an intermediate flange and then fastened through bolt connection, then the new skip is lifted by the lifting device (1), the flat car (5) is moved out, the movable sleeve frame (2) is closed, a skip head rope and a tail rope are installed, and skip replacement is completed.
2. The method for rapidly replacing a large coal mine skip according to claim 1, wherein the lifting device (1) is suspended on a temporary lifting beam (13), and the temporary lifting beam (13) is detachably arranged at a proper position at the upper end of the movable sleeve frame.
3. The method for rapidly replacing the large skip for coal mine according to claim 1, wherein the skip comprises a skip upper body (3) and a skip lower body (4), and the skip upper body (3) and the skip lower body (4) are connected through an intermediate flange.
4. The method for rapidly replacing the large skip for the coal mine according to claim 1, wherein the movable sleeve frame (2) is arranged at a wellhead and comprises a left movable sleeve frame part (8), a right movable sleeve frame part (9), a stand column (10) and hinges, the stand column (10) is connected with the left movable sleeve frame part (11) and the right movable sleeve frame part (12) through the bolts, the left movable sleeve frame part (8) and the right movable sleeve frame part (9) are bilaterally symmetrical, the hinges are arranged on two sides of the movable sleeve frame (2), the bolts connected between the stand column (10) and the left movable sleeve frame part (8) and the right movable sleeve frame part (9) are respectively dismounted, and the whole door type movable sleeve frame can be opened through rotating the left movable sleeve frame part (8) and the right movable sleeve frame part (9) to open.
5. The method for rapidly replacing a large coal mine skip according to claim 4, characterized in that the movable sleeve frame (2) is 0-90 ° in the rotation direction of the hinge.
6. The method for rapidly replacing the large coal mine skip bucket according to claim 5, wherein the hinge comprises an upper hinge (11) and a lower hinge (12), the upper hinge (11) is arranged at the upper side of the movable sleeve frame, the lower hinge (12) is arranged at the lower side of the movable sleeve frame, and a thrust cylindrical roller bearing is arranged on a pin shaft of the lower hinge (12).
7. The method for rapidly replacing a large coal mine skip according to claim 1, characterized in that the temporary rail (6) is detachably connected with the rail (7) through a fishplate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810353507.3A CN108516450B (en) | 2018-04-19 | 2018-04-19 | Method for quickly replacing large skip bucket of coal mine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810353507.3A CN108516450B (en) | 2018-04-19 | 2018-04-19 | Method for quickly replacing large skip bucket of coal mine |
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| CN108516450A CN108516450A (en) | 2018-09-11 |
| CN108516450B true CN108516450B (en) | 2020-02-14 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111017690B (en) * | 2020-01-19 | 2022-06-21 | 山东黄金矿业（玲珑）有限公司 | Method for replacing steel cage guide of shaft of multi-rope friction type elevator |
| CN111392453B (en) * | 2020-04-21 | 2021-09-28 | 神华黄骅港务有限责任公司 | Method for replacing chute of ship loader and ship loader |
| CN116119499A (en) * | 2023-02-16 | 2023-05-16 | 山东黄金矿业（玲珑）有限公司 | Winding type elevator cage replacing method |
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| GB110966A (en) * | 1916-11-27 | 1917-11-15 | George William Lester | Improvements in and relating to Safety Appliances for Pit-cages, Lifts and the like. |
| DE1064703B (en) * | 1956-09-29 | 1959-09-03 | Skip Cie G M B H | Device for exchanging shaft conveying means |
| SU602464A1 (en) * | 1975-09-15 | 1978-04-15 | Донецкий Госудапственный Проектно-Конструкторский И Экспериментальный Институт Комплексной Механизации Шахт | Bottom-action pusher for changing cars in cage |
| CN87103416A (en) * | 1987-03-22 | 1988-10-12 | 扎布热采煤联合公司扎布热-别尔舒维采煤煤矿 | Skip hoisting system |
| CN2145780Y (en) * | 1992-12-02 | 1993-11-10 | 苏粮 | Displacing and mounting apparatus for hopper of bucket elevator |
| CN103588074A (en) * | 2013-11-25 | 2014-02-19 | 徐州煤矿安全设备制造有限公司 | Large-tonnage narrow and long external force type bend unloading skip bucket |
| CN104528563A (en) * | 2014-12-16 | 2015-04-22 | 枣庄矿业(集团)付村煤业有限公司 | Novel roller and novel process for replacing roller friction liners on line |
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2018
- 2018-04-19 CN CN201810353507.3A patent/CN108516450B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB189714735A (en) * | 1897-06-17 | 1897-07-17 | Anselme Moriame | Improvements in or relating to Lifts or Hoists for Use in Mines or the like. |
| GB110966A (en) * | 1916-11-27 | 1917-11-15 | George William Lester | Improvements in and relating to Safety Appliances for Pit-cages, Lifts and the like. |
| DE1064703B (en) * | 1956-09-29 | 1959-09-03 | Skip Cie G M B H | Device for exchanging shaft conveying means |
| SU602464A1 (en) * | 1975-09-15 | 1978-04-15 | Донецкий Госудапственный Проектно-Конструкторский И Экспериментальный Институт Комплексной Механизации Шахт | Bottom-action pusher for changing cars in cage |
| CN87103416A (en) * | 1987-03-22 | 1988-10-12 | 扎布热采煤联合公司扎布热-别尔舒维采煤煤矿 | Skip hoisting system |
| CN2145780Y (en) * | 1992-12-02 | 1993-11-10 | 苏粮 | Displacing and mounting apparatus for hopper of bucket elevator |
| CN103588074A (en) * | 2013-11-25 | 2014-02-19 | 徐州煤矿安全设备制造有限公司 | Large-tonnage narrow and long external force type bend unloading skip bucket |
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| CN108516450A (en) | 2018-09-11 |
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