Belt conveyor head part

Abstract

The embodiment of the utility model provides a belt conveyor head part. The belt conveyor head part comprises a first stand column, a second stand column and a third stand column which are arranged at intervals. The first bottom plate and the second bottom plate are respectively used for connecting the adjacent stand columns; the first electric roller is vertically installed on the side face of the second stand column, a brake disc is installed on the first electric roller, and a brake is installed on the portion, located on one side of the first electric roller, of the first bottom plate; the second electric roller is horizontally mounted on the second bottom plate through a roller frame with an arch-shaped opening; the bottom of the unloading upper frame is connected with the tops of the three stand columns, and one end, extending out of the outer side of the first stand column, of the unloading upper frame is provided with an unloading roller; the machine head carrier roller sets are arranged on the unloading upper frame at intervals. A horizontal and vertical roller mounting mode is adopted, mounting space is provided for the brake disc and the brake, dropped coal accumulation below the rollers is cleaned through the arch-shaped openings, the overall structure is compact, strength is high, stability and transmission efficiency are both considered, and the device is suitable for the field of belt conveying equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of belt conveying equipment, in particular to a belt conveyor head. BACKGROUND

[0002] The belt conveyor has strong conveying capacity, long conveying distance, simple structure, easy maintenance, and can be easily programmed and automated operation, and is widely used in mines. In the belt conveyor, the belt conveyor head is one of the important components of the conveyor, and its two drums are important components.

[0003] In the conventional belt conveyor head, the installation mode of the two head drums has the following modes: horizontally installed on the cross beams on both sides of the middle stand, the head drum of this installation mode is difficult to adjust in the vertical direction, and the space below the head drum is compact, and the coal pile below the head drum is difficult to clean; vertically installed on both sides of the middle stand, in this installation mode, due to the weight of the head drum, the two head drums need to be lifted during vertical installation, which has high operation cost, high difficulty, and safety hazards; by setting a herringbone frame at the middle stand, the two head drums are installed on the two hypotenuses, respectively. Due to the existence of the hypotenuse, the peripheral space of the two head drums in this installation mode is further compressed, and the brake cannot be installed. SUMMARY

[0004] In order to solve one of the above technical defects, the present application provides a belt conveyor head, comprising:

[0005] The left side frame and the right side frame are symmetrical to each other, and each comprises:

[0006] The first stand, the second stand and the third stand are arranged at intervals;

[0007] The first bottom plate and the second bottom plate, the two ends of the first bottom plate are connected with the bottom end of the first stand and the bottom end of the second stand, respectively, and the two ends of the second bottom plate are connected with the bottom end of the second stand and the bottom end of the third stand, respectively;

[0008] The plurality of cross beams, the two ends of the cross beam are connected with the left side frame and the right side frame, respectively;

[0009] The first electric drum is installed between the first stand and the second stand, and the drum bases at both ends of the first electric drum are vertically installed on the side surfaces of the two second stands, respectively. The end of the first electric drum is provided with a brake disc, and the brake disc is matched with a brake installed on one side of the first bottom plate;

[0010] A second motorized roller is installed between the second column and the third column, and a roller bracket is arranged on the second bottom plate. Roller bases at both ends of the second motorized roller are horizontally installed on the roller brackets on both sides, respectively.

[0011] An unloading upper frame is connected to the top of the first column, the second column, and the third column, respectively. One end of the unloading upper frame extends out of the outside of the first column.

[0012] An unloading roller is rotatably installed at one end of the unloading upper frame extending out of the outside of the first column.

[0013] A plurality of head carrier roller groups are arranged on the unloading upper frame.

[0014] A conveying belt is arranged to pass through the first motorized roller, the second motorized roller, the unloading roller, and the plurality of head carrier roller groups in sequence to the tail of the belt conveyor.

[0015] Further, the first motorized roller and the second motorized roller are permanent magnet rollers. The first motorized roller and the second motorized roller each include:

[0016] A stator shaft is a hollow shaft, and both ends of the stator shaft are connected to the left bracket and the right bracket through the roller bases, respectively.

[0017] A junction box is arranged at one end of the stator shaft.

[0018] A water inlet and outlet is arranged at the other end of the stator shaft, and a circulating water cooling unit is connected to the water inlet and outlet.

[0019] Further, an arc-shaped opening is arranged on the roller bracket.

[0020] Further, a jackscrew is installed at one end of the unloading upper frame extending out of the outside of the first column. The jackscrew is installed on the unloading upper frame behind the roller shaft of the unloading roller, and the working end of the jackscrew is in contact with the roller shaft of the unloading roller.

[0021] Further, a one-way sweeper is installed at one end of the unloading upper frame extending out of the outside of the first column. The one-way sweeper is installed on the unloading upper frame below the unloading roller.

[0022] Further, a mud scraping plate is installed on the upper surface of the unloading upper frame. The mud scraping plate is located behind the unloading roller, and the mud scraping plate is in close contact with the roller surface of the unloading roller.

[0023] Further, a tow belt roller is installed on the top of the side of the first column away from the first motorized roller. The tow belt roller is located below the conveying belt, and the conveying belt passes through the first motorized roller, the second motorized roller, the tow belt roller, the unloading roller, and the plurality of head carrier roller groups in sequence to the tail of the belt conveyor.

[0024] Further, the end of the unloading upper frame extending outside the first stand is connected with the first stand through a diagonal brace, one end of the diagonal brace is connected to the lower surface of the unloading upper frame behind the first sweeper, and the other end of the diagonal brace is connected to the bottom of the first stand away from the side of the first motorized roller.

[0025] Further, the lower surface of the end of the unloading upper frame extending outside the first stand is provided with the second sweeper.

[0026] Further, each group of head roller groups comprises:

[0027] A bottom roller is horizontally installed on the unloading upper frame through a bottom roller seat.

[0028] Two side rollers are symmetrically arranged on both sides of the bottom roller, and the side rollers are obliquely installed on the unloading upper frame through side roller seats, and the horizontal height of the end of the two side rollers away from the bottom roller is higher than the horizontal height of the end close to the bottom roller.

[0029] The head part of the belt conveyor provided in the embodiment of the application adopts a horizontal and vertical roller installation mode, the head frame has reasonable overall layout, compact structure and high strength, and meanwhile, sufficient space is reserved between the first stand and the second stand for installing the brake disc and the brake; the brake disc is integrated with the roller body, and the brake is directly installed on the head frame, so that the stability and braking effect are considered; the roller frame and the arc-shaped opening are arranged below the second motorized roller, so that the coal accumulation below the roller can be conveniently cleaned.

[0030] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by means of the instrumentalities particularly pointed out in the written description and claims hereof, as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application. In the drawings:

[0032] Fig. 1 A front view of the head part of the belt conveyor provided in the embodiment of the application;

[0033] Fig. 2 A side view of the head part of the belt conveyor provided in the embodiment of the application;

[0034] Fig. 3 A top view of the head part of the belt conveyor provided in the embodiment of the application;

[0035] Wherein, 10 is a left side frame, 101 is a first vertical column, 102 is a second vertical column, 103 is a third vertical column, 104 is a first bottom plate, 105 is a second bottom plate, 106 is a transition plate, 11 is a right side frame, 12 is a cross beam, 13 is an inclined strut, 20 is a first electric roller, 201 is a brake disc, 202 is a brake, 203 is a stator shaft, 204 is a junction box, 205 is a water inlet and outlet, 21 is a second electric roller, 211 is a roller frame, 212 is an arc-shaped port, 30 is an unloading upper frame, 40 is an unloading roller, 401 is a top wire, 402 is a first sweeper, 403 is a mud scraping plate, 50 is a machine head carrier roller set, 501 is a bottom roller, 502 is a side roller, 60 is a conveyor belt, 70 is a drag belt roller, and 80 is a second sweeper. DETAILED DESCRIPTION

[0036] In order to make the technical solutions and advantages in the embodiments of the present application more clear and apparent, the following will combine the accompanying drawings to further describe the embodiments of the present application. Figs. 1-3 Further detailed description will be given to the exemplary embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0037] In the process of implementing the present application, the inventors found that there are several installation methods for two machine head rollers in the conventional machine head part of the belt conveyor, including: horizontally installing the two machine head rollers on the cross beams on both sides of the middle vertical column, which makes it difficult to adjust the machine head rollers in the vertical direction, and the space below the machine head rollers is compact, and the coal pile below the machine head rollers is difficult to clean; vertically installing the two machine head rollers on both sides of the middle vertical column, which needs to hoist the two machine head rollers during the vertical installation due to the self-weight of the machine head rollers, and the operation cost is high, the difficulty is great, and there is a safety hazard; and installing the two machine head rollers on two inclined edges through the installation of the herringbone frame on the middle vertical column, which further compresses the space around the two machine head rollers in this installation method, and the brake cannot be installed.

[0038] In view of the above problems, the present application provides a machine head part of a belt conveyor, which comprises:

[0039] The left side frame 10 and the right side frame 11 are mutually symmetrical, and each of the left side frame 10 and the right side frame 11 comprises:

[0040] The first vertical column 101, the second vertical column 102, and the third vertical column 103 are arranged at intervals, and the third vertical column 103 is installed with the transition plate 106 on the side away from the second vertical column 102, for connecting with the middle part of the belt conveyor;

[0041] The first base plate 104 and the second base plate 105 are respectively connected to the bottom of the first column 101 and the bottom of the second column 102 at both ends, and the second base plate 105 is respectively connected to the bottom of the second column 102 and the bottom of the third column 103 at both ends.

[0042] Multiple crossbeams 12, with their ends connected to the left side frame 10 and the right side frame 11 respectively;

[0043] The first electric roller 20 is installed between the first column 101 and the second column 102. The roller bases at both ends of the first electric roller 20 are vertically installed on the sides of the second column 102 on both sides. A brake disc 201 is installed at the end of the first electric roller 20. A brake 202 is installed on the first base plate 104 on one side of the first electric roller 20. The brake 202 cooperates with the brake disc 201. The braking end of the brake 202 is inclined toward the center of the brake disc 201 and forms an angle of 20° with the horizontal plane.

[0044] The second electric roller 21 is installed between the second column 102 and the third column 103. A roller frame 211 is provided on the second base plate 105. The roller bases at both ends of the second electric roller 21 are horizontally installed on the roller frames 211 on both sides.

[0045] The unloading rack 30 is connected at its bottom to the top of the first column 101, the second column 102 and the third column 103 respectively, and one end of the unloading rack 30 extends out of the outside of the first column 101.

[0046] The unloading roller 40 is rotatably mounted on one end of the unloading frame 30 extending outward from the first column 101.

[0047] Multiple head roller groups 50 are spaced apart on the unloading frame 30;

[0048] The conveyor belt 60 passes sequentially around the first electric roller 20, the second electric roller 21, the unloading roller 40, and multiple head idler groups 50 to the tail of the belt conveyor.

[0049] In practice, the first electric roller 20 and the second electric roller 21 are connected to an external power source. When the first electric roller 20 and the second electric roller 21 are started simultaneously, the conveyor belt 60 enters from below the first electric roller 20, enters from above the first electric roller 20 and enters from below the second electric roller 21, then enters from below the unloading roller 40 and exits from above the unloading roller 40. It passes through the head idler group 50 to the tail of the belt conveyor and finally returns to below the first electric roller 20, completing the closed loop of the conveyor belt 60. When the use ends or an emergency occurs, the power supply to the first electric roller 20 and the second electric roller 21 is cut off, and the brake 202 is activated to brake the brake disc 201.

[0050] The belt conveyor head provided by the application creatively installs two electric rollers in horizontal and vertical manners respectively. Compared with the traditional belt conveyor head, the application can consider the adjustment of the roller in the vertical direction and the lower installation difficulty of the roller. Meanwhile, the horizontal and vertical installation manner can reserve sufficient space between the first vertical column and the second vertical column, and provide an installation basis for the installation of the brake and the brake disc of the first electric roller. The brake disc is integrated with the roller body, and the brake is directly installed on the head frame, so that better stability and braking effect can be achieved. The application is especially suitable for occasions with relatively compact space, such as coal mines and slopes. Through the setting of the roller frame, a cleaning space is reserved below the roller, so that the coal accumulation below the roller can be cleaned.

[0051] In the implementation of the application, the inventor finds that the roller of the traditional belt conveyor is driven by a speed reducer motor, including a motor, a coupler, a brake, a reducer and other transmission components, which has the disadvantages of low transmission efficiency, high failure rate, high maintenance cost and the like.

[0052] In view of the above problems, a preferred scheme is provided in the embodiments of the application. The first electric roller 20 and the second electric roller 21 are permanent magnet rollers, and the first electric roller 20 and the second electric roller 21 each include:

[0053] The stator shaft 203 is a hollow shaft, and its two ends are connected to the left frame and the right frame through the roller base respectively;

[0054] The junction box part 204 is arranged at one end of the stator shaft 203 for wiring, and the first electric roller 20 and the second electric roller 21 are electrically connected to an external power supply through the junction box part 204;

[0055] The water inlet and outlet 205 is arranged at the other end of the stator shaft 203, and a circulating water cooling unit is connected to the water inlet and outlet 205.

[0056] In the implementation, the permanent magnet outer roller mainly comprises a terminal box part, a stator assembly, a rotor assembly, a self-aligning bearing and a backstop. The terminal box part leads an external power source to the permanent magnet outer rotor electric roller. The coil on the stator generates a magnetic field, which interacts with the permanent magnet on the rotor. The rotor does a uniform circular motion on the stator through the self-aligning bearing, thereby driving the belt to transport the materials from one place to another. The water inlet and outlet 205 ensures the reasonable circulation of cooling water and fully removes the heat inside the motor. Compared with the traditional belt conveyor which realizes constant speed and torque operation through an asynchronous motor and a speed reducer, the permanent magnet electric roller has more transmission links and low transmission efficiency. The permanent magnet electric roller of the application has the following characteristics: high magnetic field strength, large depth, simple structure, convenient use, no maintenance, no power consumption, no demagnetization in all seasons, cancellation of auxiliary transmission equipment such as speed reducer, and reduction of maintenance amount and use cost.

[0057] As a preferred scheme, the drum frame 211 is provided with an arc-shaped opening 212. The shovel and other tools are inserted into the lower part of the drum through the arc-shaped opening 212 to shovel and clean the accumulated coal.

[0058] As a preferred scheme, the top wire 401 is installed at the end of the first stand 101 extending out of the upper frame 30. The top wire 401 is installed on the upper frame 30 behind the roller shaft of the unloading roller 40, and the working end of the top wire 401 is in contact with the roller shaft of the unloading roller 40. By adjusting the top wire 401, the position of the unloading roller 40 is adjusted, thereby adjusting the tension of the conveying belt 60.

[0059] As a preferred scheme, the unloading upper frame 30 is provided with a cleaning device 402 at the end extending out of the first stand 101. The cleaning device 402 is installed on the unloading upper frame 30 below the unloading roller 40.

[0060] As a preferred scheme, the unloading upper frame 30 is provided with a mud scraping plate 403 on the upper surface. The mud scraping plate 403 is located behind the unloading roller 40, and the mud scraping plate 403 is in close contact with the roller surface of the unloading roller 40.

[0061] As a preferred scheme, the unloading upper frame 30 is provided with a second cleaning device 80 at the end extending out of the first stand 101.

[0062] In the embodiment, the first sweeper 402 is preferably a gravity sweeper, which can keep the blade of the sweeper close to the surface of the conveyor belt 60 before and after the adjustment of the unloading roller 40, so as to scrape off the materials adhered to the conveyor belt 60. The second sweeper 80 is used to clean the sticky coal on the lower surface of the conveyor belt 60. The mud scraping plate 403 is used to clean the sticky coal on the surface of the unloading roller 40. The cooperation of the first sweeper 402, the second sweeper 80 and the mud scraping plate 403 can clean the sticky coal on the front and back surfaces of the conveyor belt, prevent the materials from being clamped between the rollers, and thus protect the rollers and the conveyor belt.

[0063] As a preferred solution, the first upright column 101 is provided with a tow belt roller 70 at the top of the side surface away from the first motorized roller 20. The tow belt roller 70 is located below the conveyor belt 60. The conveyor belt 60 sequentially passes through the first motorized roller 20, the second motorized roller 21, the tow belt roller 70, the unloading roller 40 and the plurality of head roller sets 50 to the tail of the belt conveyor. The tow belt roller 70 is used to support the conveyor belt 60.

[0064] As a preferred solution, the unloading upper frame 30 is connected with the first upright column 101 through the inclined support 13 at the end extending out of the first upright column 101. One end of the inclined support 13 is connected to the lower surface of the unloading upper frame 30 behind the first sweeper 402, and the other end of the inclined support 13 is connected to the bottom of the first upright column 101 away from the side surface of the first motorized roller 20. The inclined support 13 is used to support the end of the unloading upper frame 30 extending out, and increase the overall strength of the head frame.

[0065] As a preferred solution, each head roller set 50 comprises:

[0066] a bottom roller 501, which is horizontally installed on the unloading upper frame 30 through a bottom roller seat;

[0067] two side rollers 502, which are symmetrically arranged on both sides of the bottom roller 501. The side rollers 502 are obliquely installed on the unloading upper frame 30 through side roller seats. The horizontal height of the end of the two side rollers 502 away from the bottom roller 501 is higher than that of the end close to the bottom roller 501. The arrangement of the head roller set 50 ensures the smooth entry and exit of the conveyor belt 60.

[0068] The belt conveyor machine head provided by the application creatively installs two electric rollers in horizontal and vertical manners, and takes into account the adjustment of the roller in the vertical direction and the lower installation difficulty of the roller. The first electric roller is vertically installed, so that sufficient space is reserved between the first vertical column and the second vertical column, thereby providing a mounting basis for the installation of the brake and the brake disc of the first electric roller. The brake disc is integrated with the roller body, and the brake is directly installed on the machine head frame, so that the stability and braking effect of the brake meet the requirements of the roller. The roller frame and the arc-shaped opening are arranged below the second electric roller, so as to facilitate the cleaning of the coal accumulation below the roller. The roller is a permanent magnet roller, which effectively solves the problems of low driving efficiency, unstable start, difficulty in starting under heavy load, high failure rate of the belt conveyor and the like. Through the cooperation of the first sweeper, the second sweeper and the mud scraping plate, the coal adhering to the front and back surfaces of the conveyor belt is cleaned, and the material is prevented from being clamped between the rollers, thereby protecting the roller and the conveyor belt. The belt conveyor machine head provided by the application has reasonable overall layout of the machine head frame, compact structure, high strength, stable and reliable operation, high transmission efficiency and strong practicability.

[0069] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0070] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0071] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0072] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they have the benefit of the present disclosure without departing from the spirit and scope of the application. Accordingly, it is intended that such additions and modifications be included within the scope of the application. It is the following claims, including any amendments thereto, which define the scope of the application.

[0073] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A head section of a belt conveyor, characterized in that The utility model relates to a kind of belt conveyor, including: Mutual symmetry left frame (10) and right frame (11), the left frame (10) and right frame (11) each include: First column (101), second column (102) and third column (103) are arranged at intervals; First bottom plate (104) and second bottom plate (105), two ends of the first bottom plate (104) are connected with the bottom end of the first column (101), the bottom end of second column (102) respectively, two ends of the second bottom plate (105) are connected with the bottom end of the second column (102), the bottom end of third column (103) respectively; Multiple crossbeams (12), two ends of the crossbeam (12) are connected with the left frame (10) and right frame (11) respectively; First motorized roller (20) is installed between the first column (101) and second column (102), the roller base of two ends of the first motorized roller (20) is vertically installed on the side of two sides second column (102) respectively, brake disc (201) is installed at the end of the first motorized roller (20), brake (202) is installed on the first bottom plate (104) on the side of the first motorized roller (20), and the brake (202) is matched with the brake disc (201); Second motorized roller (21) is installed between the second column (102) and third column (103), and roller frame (211) is arranged on the second bottom plate (105), and the roller base of two ends of the second motorized roller (21) is horizontally installed on the roller frame (211) of two sides respectively; Unloading upper frame (30) is connected with the top of the first column (101), the second column (102) and the third column (103) respectively, and one end of the unloading upper frame (30) extends outside the first column (101); Unloading roller (40) is rotatably installed on the end of the unloading upper frame (30) extending outside the first column (101); Multiple head carrier roller groups (50) are arranged at intervals on the unloading upper frame (30); Conveying belt (60) is sequentially wound around the first motorized roller (20), the second motorized roller (21), the unloading roller (40) and the multiple head carrier roller groups (50) to the tail of the belt conveyor.

2. The head section of a belt conveyor according to claim 1, characterized in that The first motorized roller (20) and the second motorized roller (21) are permanent magnet rollers, and the first motorized roller (20) and the second motorized roller (21) each include: Stator shaft (203) is a hollow shaft, and two ends thereof are connected with the left frame and the right frame through the roller base respectively; Terminal box part (204) is arranged at the wiring end of the stator shaft (203); Water inlet and outlet (205) is opened at the other end of the stator shaft (203), and the water inlet and outlet (205) is connected with a circulating water cooling unit.

3. The head section of a belt conveyor according to claim 1, characterized in that The arcuate opening (212) is opened in the roller frame (211).

4. The head assembly of claim 1, wherein, The top wire (401) is installed on the unloading shelf (30) behind the roller shaft of the unloading roller (40).

5. The head assembly of claim 1, wherein, The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101).

6. The head assembly of claim 1, wherein, The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101).

7. The head assembly of claim 1, wherein The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101).

8. The head section of a belt conveyor according to claim 5, characterized in that The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101).

9. The head assembly of claim 1, wherein, The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101).

10. The head assembly of claim 1, wherein, The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). 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The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf (30) is provided with a cleaning device (402) at one end extending out of the first column (101). The unloading shelf

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