Spherical rotor anti-adhesion air-locking unloader and unloading method

Abstract

The invention relates to the technical field of material conveying, and discloses a spherical rotor anti-adhesion air locking discharger and a discharging method.The discharger comprises a shell, a feeding pipe and a discharging pipe which are used for feeding and discharging are arranged at the upper end and the lower end of the shell respectively, a spherical rotor is rotationally connected into the shell, and the spherical rotor is a hollow sphere with a storage inner cavity; an opening is formed in one side of the spherical rotor, the spherical rotor is connected with a power device, and the opening of the spherical rotor can be sequentially communicated with the feeding pipe and the discharging pipe to achieve material conveying. The unloading device is simple in structure and reliable in operation, the problem of material adhesion is solved, efficient conveying of materials is facilitated, and the unloading device can be better suitable for unloading operation of viscous materials; meanwhile, the spherical rotor relieves the blade loss of a traditional star-shaped unloader, the maintenance period and the service life of the unloader are prolonged, and the power consumption is reduced; the cleaning structure achieves automatic scraping and cleaning of the inner wall of the spherical rotor, the problem that materials are prone to being attached is solved, and the material conveying efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material conveying, and in particular to a spherical rotor anti-adhesion air-locking discharger and a discharge method. Background Art

[0002] At present, the most common unloaders for material transportation on the market are star-shaped unloaders, which are usually divided into ordinary type, pressure-resistant type, and high-temperature resistant type. They are often used in pressure output systems or negative pressure output systems. When in use, the feed pipe at the top of the unloader receives the material and stores it in the interval of the star-shaped blades on the impeller. The impeller rotates to bring the material to the lower discharge port, and the material falls from the discharge port by its own weight. The rotation speed of the star-shaped blades can be adjusted by the drive device to control the conveying speed of the material. While unloading evenly, the upper and lower air pressures are cut off to play a role in locking the air.

[0003] Traditional star-shaped dischargers are suitable for powdery, granular, and blocky materials. At the same time, the conveying capacity of the equipment is greatly affected by factors such as the fluidity and viscosity of the materials. When discharging sticky materials, the materials are easy to adhere to the rotating impeller and it is difficult to fall from the discharge port by relying on their own weight, which makes the discharger easy to get blocked, seriously reducing the discharge efficiency; at the same time, the traditional structure discharger has poor air tightness during the discharge process, which affects the air locking effect; there is a shearing effect between the star-shaped blades and the casing, which will cause the material to break and increase the power consumption of the drive device. For materials with higher hardness, the star-shaped blades of the discharger need to be wear-resistant or made of wear-resistant materials, which is expensive and has a short service life.

[0004] In view of this, developing a spherical rotor anti-adhesion air-locking unloader and unloading method for application in material conveying operations is an issue that needs to be urgently addressed. Summary of the invention

[0005] The purpose of the present invention is to provide a spherical rotor anti-adhesion air lock unloader to address the above problems, so as to solve the problems of easy blockage, low efficiency and poor air tightness of traditional star-shaped unloaders during use, and at the same time solve the problems of easy material breakage, high power consumption and short service life of star-shaped unloaders.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A spherical rotor anti-adhesion air-locking unloader comprises a shell, wherein a feed pipe and a discharge pipe for feeding and discharging are respectively arranged at the upper and lower ends of the shell, a spherical rotor is rotatably connected inside the shell, the spherical rotor is a hollow sphere with a material storage cavity, one side of the spherical rotor is provided with openings for feeding and discharging corresponding to the feed pipe and the discharge pipe, the spherical rotor is connected to a power device to obtain rotational power, and during the rotation of the spherical rotor, the opening can be connected to the feed pipe and the discharge pipe in sequence to realize the feeding and discharging actions.

[0007] Preferably, a sealing structure is provided in the shell, and the sealing structure includes sealing rings arranged at the feed pipe end and the discharge pipe end, the sealing rings are sealingly connected to the spherical rotor, and the diameter of the sealing rings is set corresponding to the opening size of the spherical rotor.

[0008] Preferably, the sealing structure comprises a sealing body arranged in the housing, the sealing body is an annular structure having an arcuate sealing surface, the curvature of the arcuate sealing surface corresponds to the spherical surface of the spherical rotor, and the spherical rotor is sealed and connected to the housing via the arcuate sealing surface.

[0009] Preferably, an elastic member is provided between the sealing structure and the housing so that the sealing structure is elastically connected to the spherical rotor, so that the sealing structure has adaptive adjustment capability.

[0010] Preferably, a cleaning structure for cleaning materials is provided in the spherical rotor, and the cleaning structure includes a cleaning arm arranged corresponding to the spherical surface of the inner wall of the spherical rotor, and the cleaning arm is an arc-shaped rod-shaped structure arranged close to the inner wall of the spherical rotor, and the cleaning arm does not rotate synchronously with the spherical rotor.

[0011] Preferably, the cleaning arm is fixedly connected to the shell, a fixing seat is provided on the shell, a fixing shaft is fixedly provided on the cleaning arm, the fixing shaft penetrates the spherical rotor from the side and is fixedly connected to the fixing seat, and the spherical rotor is rotatably connected to the fixing shaft.

[0012] Preferably, the cleaning arm is rotatably connected to the shell, the output shaft of the power device is fixedly connected to the spherical rotor, the extended end of the output shaft passes through the spherical rotor, and is connected to the cleaning arm through a planetary gear assembly, the planetary gear assembly includes a driving gear fixedly connected to the output shaft, the driving gear is circumferentially meshed with a plurality of planetary gears, the plurality of planetary gears are fixedly connected to the planetary carrier, the planetary carrier is fixedly connected to the shell, the outer side of the planetary gear is meshed with a driven gear ring, and the cleaning arm is fixedly connected to the driven gear ring.

[0013] Preferably, the inner side of the driven gear ring is covered with a sealing plate, the sealing plate is slidingly and sealingly connected to the side of the spherical rotor, and the sealing plate is rotationally and sealingly connected to the output shaft of the power device.

[0014] Preferably, an anti-jamming plate is provided in the feed pipe. The anti-jamming plate is an arc-shaped plate structure for guiding the material flowing through the feed pipe. There are two anti-jamming plates, which are respectively arranged on the front and rear sides corresponding to the rotation direction of the spherical rotor.

[0015] At the same time, the present invention also provides a discharging method, which is implemented based on the above-mentioned spherical rotor anti-adhesion air lock discharging device, and comprises the following steps: The material enters the feed pipe from the external conveying equipment, and the power device drives the spherical rotor to rotate in the shell. When the opening of the spherical rotor is upward, the opening is connected with the feed pipe, and the material enters the storage cavity of the spherical rotor through the opening. The spherical rotor continues to rotate with the material. When the opening is downward and connected to the discharge pipe, the material in the storage cavity will fall due to gravity and be discharged through the discharge pipe to complete the unloading.

[0016] The beneficial effects of the present invention are: The present invention adopts a rotating spherical rotor to realize unloading. Compared with the traditional star-shaped unloader, it has the advantages of simple structure and reliable operation. The material rolls in the storage cavity as the spherical rotor rotates, which improves the problem of material adhesion; the larger opening design is conducive to the efficient transportation of materials, and eliminates the situation where materials adhere to the star-shaped impeller and cause blockage, which can be better suitable for the unloading operation of viscous materials and improves the unloading efficiency; at the same time, the use of the spherical rotor avoids the shear effect between the blades and the casing of the traditional star-shaped unloader, which causes material breakage and aggravates the blade loss, extends the maintenance period and service life of the unloader, and reduces power consumption.

[0017] In the present invention, the sealing structure is connected to the spherical rotor in a floating manner through an elastic member, so that the sealing structure has a certain degree of adaptive adjustment ability and can meet the sealing requirements of different working conditions. After the equipment has been used for a long time and has a certain degree of wear, the elastic member will push the sealing structure to adaptively stick to the spherical rotor to maintain a good seal; at the same time, when the material is a high-temperature material or the temperature of the spherical rotor rises due to the operating environment and its own operation, the spherical rotor will be affected by the high temperature and produce a certain degree of deformation. The elastic member will absorb the deformation of the spherical rotor through its own elastic deformation, always maintaining the sealing performance of the sealing structure, and ensuring the sealing reliability of the unloader under temperature changes.

[0018] In the present invention, the setting of the cleaning structure realizes automatic scraping and cleaning of the inner wall of the spherical rotor, so that the materials attached to the inner wall of the spherical rotor are loosened and fall off, and output through the opening, which effectively solves the problem of easy attachment during material transportation and ensures the unloading efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 for Figure 1 Schematic diagram of the local cross-sectional structure.

[0022] Figure 3 It is an exploded view of the sealing structure, spherical rotor and housing in the present invention.

[0023] Figure 4 , Figure 5 It is a partial cross-sectional schematic diagram of a second embodiment of the present invention.

[0024] Figure 6 It is a partial cross-sectional schematic diagram of the shell in the present invention.

[0025] In the figure: 10--housing; 11--feeding pipe; 12--discharging pipe; 13--anti-jamming plate; 20--spherical rotor; 21--opening; 30--power device; 31--output shaft; 40--sealing structure; 41--sealing ring; 42--sealing body; 43--arc-shaped sealing surface; 44--elastic member; 51--cleaning arm; 52--fixed seat; 53--fixed shaft; 54--planetary gear assembly; 541--driving gear; 542--planetary gear; 543--planetary carrier; 544--driven ring gear; 55--sealing plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] like Figure 1-6 As shown, a spherical rotor anti-adhesion air lock unloader includes a shell 10, wherein a feed pipe 11 and a discharge pipe 12 for feeding and discharging are respectively arranged at the upper and lower ends of the shell 10, and a spherical rotor 20 is rotatably connected in the shell 10, wherein the spherical rotor 20 is a hollow sphere having an inner cavity for storing materials, and an opening 21 for feeding and discharging materials is opened on one side of the spherical rotor 20 corresponding to the feed pipe 11 and the discharge pipe 12, and the spherical rotor 20 is connected to a power device 30 to obtain rotational power, and during the rotation of the spherical rotor 20, the opening 21 can be sequentially connected to the feed pipe 11 and the discharge pipe 12 to realize the feeding and discharging actions, thereby completing the unloading. When in use, the power device 30 drives the spherical rotor 20 to rotate in the shell 10. When the opening 21 of the spherical rotor 20 is upward, the opening 21 will be connected with the feed pipe 11, and the material enters the storage cavity of the spherical rotor 20 through the feed pipe 11. The spherical rotor 20 continues to rotate carrying the material. When the opening 21 is downwardly connected to the discharge pipe 12, the material in the storage cavity will fall due to gravity and be discharged through the discharge pipe 12 to complete the unloading.

[0028] This embodiment uses a rotating spherical rotor 20 to achieve unloading. Compared with the traditional star-shaped unloader, it has the advantages of simple structure and reliable operation. The material rolls in the storage cavity as the spherical rotor 20 rotates, which improves the problem of material adhesion. The larger opening design facilitates the efficient transportation of materials and effectively prevents the situation where materials adhere to the star-shaped impeller and cause blockage. It can be better applied to the unloading operation of viscous materials to ensure the unloading efficiency. At the same time, the use of the spherical rotor 20 avoids the shear effect between the blades and the casing of the traditional star-shaped unloader, which causes material breakage and aggravates the blade loss, extends the maintenance period and service life of the unloader, and reduces power consumption.

[0029] As a preferred embodiment, Figure 2-3 As shown, a sealing structure 40 is provided in the housing 10, and the sealing structure 40 includes a sealing ring 41 provided at the end of the feed pipe 11 and the end of the discharge pipe 12, and the sealing ring 41 is sealed and connected to the spherical rotor 20, and the diameter of the sealing ring 41 is set corresponding to the size of the opening 21 of the spherical rotor 20. When the spherical rotor 20 rotates to discharge, the spherical rotor 20 always maintains a sealed connection with the sealing ring 41 on at least one side, thereby ensuring the sealing of the discharger, so that the present invention has an air locking function, ensuring the gas sealing of the material during the discharge process, and improving the scope of application.

[0030] Preferably, the sealing structure 40 includes a sealing body 42 disposed in the housing 10, the sealing body 42 is an annular structure having an arcuate sealing surface 43, the arcuate sealing surface 43 corresponds to the spherical surface of the spherical rotor 20, and the spherical rotor 20 is sealed and connected to the housing 10 via the arcuate sealing surface 43. The setting of the sealing body 42 effectively fills the gap in the housing 10 and avoids the accumulation of materials in the housing 10.

[0031] Preferably, the sealing structure 40 is elastically connected to the spherical rotor 20, so that the sealing structure 40 has adaptive adjustment capabilities to meet the sealing requirements of different working conditions. Specifically, an elastic member 44 is provided between the sealing structure 40 and the housing 10, so that the sealing ring 41 and the sealing body 42 are elastically connected to the spherical rotor 20. When the sealing structure 40 is worn to a certain extent after long-term use, the elastic member 44 will push the sealing structure 40 to adaptively adhere to the spherical rotor 20 to maintain a good seal. At the same time, when the material is a high-temperature material or the temperature of the spherical rotor 20 rises due to the operating environment and its own operation, the spherical rotor 20 will be affected by the high temperature and produce a certain degree of deformation. The elastic member 44 will absorb the deformation of the spherical rotor 20 through its own elastic deformation, always maintain the sealing performance of the sealing structure 40, and ensure the sealing reliability of the discharger under temperature changes. The elastic member 44 is preferably a wave spring or a disc spring.

[0032] As a preferred embodiment, Figure 2 , 4 As shown in Figures 5 and 6, a cleaning structure for cleaning materials is provided in the spherical rotor 20, and the cleaning structure includes a cleaning arm 51 provided corresponding to the spherical surface of the inner wall of the spherical rotor 20, and the cleaning arm 51 is an arc-shaped rod-shaped structure provided close to the inner wall of the spherical rotor 20. During the unloading process, the cleaning arm 51 does not rotate synchronously with the spherical rotor 20, forming a stirring and scraping effect on the inner wall of the spherical rotor 20, so that the materials attached to the inner wall of the spherical rotor 20 are loosened and fall off, and are output through the opening 21 to complete the unloading. This embodiment effectively solves the problem of easy attachment and clogging during material transportation, and ensures the unloading efficiency.

[0033] As a first implementation method, Figure 2 As shown, the cleaning arm 51 is fixedly connected to the housing 10. Specifically, a fixing seat 52 is provided on the housing 10. A fixing shaft 53 is fixedly provided on the cleaning arm 51. The fixing shaft 53 penetrates the spherical rotor 20 from the side and is fixedly connected to the fixing seat 52. The spherical rotor 20 is rotatably connected to the fixing shaft 53. During unloading, the cleaning arm 51 is stationary in the spherical rotor 20. The rotation of the spherical rotor 20 forms a relative movement between the cleaning arm 51 and the inner wall of the spherical rotor 20, thereby completing the cleaning and scraping action of the inner wall of the spherical rotor 20.

[0034] As a second implementation method, Figure 4-5 As shown, the cleaning arm 51 is rotatably connected to the housing 10 and rotates in the opposite direction relative to the spherical rotor 20 to improve the cleaning effect. Specifically, the output shaft 31 of the power device 30 is fixedly connected to the spherical rotor 20 to drive the spherical rotor 20 to rotate, and the extended end of the output shaft 31 passes through the spherical rotor 20 and is connected to the cleaning arm 51 through the planetary gear assembly 54 to achieve the reverse rotation of the cleaning arm 51 relative to the spherical rotor 20. The planetary gear set 54 includes a driving gear 541 fixedly connected to the output shaft 31, the driving gear 541 is circumferentially meshed with a plurality of planetary gears 542, the plurality of planetary gears 542 are all fixedly connected to a planetary carrier 543, the planetary carrier 543 is fixedly connected to the housing 10, the outer side of the planetary gear 542 is meshed with a driven ring gear 544, the cleaning arm 51 is fixedly connected to the driven ring gear 544, the inner side of the driven ring gear 544 is covered with a sealing plate 55, the sealing plate 55 is slidingly sealedly connected to the side of the spherical rotor 20, and the sealing plate 55 is rotationally sealedly connected to the output shaft 31 of the power device 30.

[0035] During operation, the output end of the power device 30 drives the spherical rotor 20 to rotate, the extended end of the output shaft 31 drives the driving gear 541 to rotate, the driving gear 541 meshes with the planetary gear 542 to rotate synchronously, and the planetary gear 542 drives the driven gear ring 544 to rotate in the opposite direction, so that the cleaning arm 51 fixedly connected to the driven gear ring 544 rotates in the opposite direction in the spherical rotor 20, and realizes the reverse cleaning and scraping action of the inner wall of the spherical rotor 20. In this process, the sealing plate 55 is slidably sealed with the side of the spherical rotor 20, and is rotationally sealed with the output shaft 31 of the power device 30 to maintain the sealing performance. Compared with the above-mentioned embodiment in which the cleaning arm 51 is fixedly arranged, this embodiment strengthens the inner wall cleaning function of the spherical rotor 20, and further improves the application effect of anti-material adhesion and anti-blocking. At the same time, this embodiment realizes the action of the cleaning arm 51 actively rotating to clean the spherical rotor 20 without the need for additional power configuration, saves power configuration, improves the cleaning effect, and further ensures the unloading efficiency.

[0036] Preferably, if Figure 2 , 6 As shown, an anti-jamming plate 13 is provided in the feed pipe 11. The anti-jamming plate 13 is an arc-shaped plate structure with a certain taper, which is used to guide the material flowing through the feed pipe 11 to control the range and position of the material entering the opening 21 of the spherical rotor 20, and prevent the spherical rotor 20 from being scratched and jammed by large pieces of material. The anti-jamming plate 13 is provided in two pieces, which are respectively provided on the front and rear sides corresponding to the rotation direction of the spherical rotor 20.

[0037] At the same time, the present invention also provides a unloading method based on the aforementioned unloader, the method comprising the following steps: the material enters the feed pipe 11 from the external conveying equipment, the power device 30 drives the spherical rotor 20 to rotate in the shell 10, when the opening 21 of the spherical rotor 20 is upward, the opening 21 is connected with the feed pipe 11, the material enters the storage cavity of the spherical rotor 20 through the opening 21, the spherical rotor 20 continues to rotate carrying the material, when the opening 21 is downwardly connected to the discharge pipe 12, the material in the storage cavity will fall due to gravity and be output through the discharge pipe 12, completing the unloading.

[0038] Preferably, the method further comprises the step of using a cleaning structure to clean the inner wall of the spherical rotor 20. Specifically, during the unloading process, the cleaning arm 51 disposed in the spherical rotor 20 does not rotate synchronously with the spherical rotor 20, so as to form a stirring and scraping effect on the inner wall of the spherical rotor 20, so that the material attached to the inner wall of the spherical rotor 20 is loosened and falls off, and is discharged through the opening 21. This effectively solves the problem of easy attachment and clogging during material transportation, and ensures the unloading efficiency.

[0039] Preferably, the method further comprises the step of guiding the material through the anti-jamming plate 13 in the feed pipe 11. Specifically, when the material flows through the feed pipe 11, the anti-jamming plate 13 guides the material through its own structure, controls the range and position of the material entering the opening 21 of the spherical rotor 20, and prevents the spherical rotor 20 from being scratched and jammed by large pieces of material.

[0040] The above disclosure is only a specific embodiment of the present invention, but the present invention is not limited thereto. For ordinary technicians in this field, without departing from the principle of the present invention, any modifications made should be deemed to belong to the protection of the present invention.

Claims

1. A spherical rotor anti-adhesion air lock discharger, characterized in that: The invention comprises a shell (10), wherein a feed pipe (11) and a discharge pipe (12) are respectively arranged at the upper and lower ends of the shell (10), and a spherical rotor (20) is rotatably connected inside the shell (10), wherein the spherical rotor (20) is a hollow sphere having a material storage cavity, and an opening (21) is provided on one side of the spherical rotor (20) corresponding to the feed pipe (11) and the discharge pipe (12). The spherical rotor (20) is connected to a power device (30) to obtain rotational power, so that the opening (21) of the spherical rotor (20) can be connected to the feed pipe (11) and the discharge pipe (12) in sequence to complete the feeding and discharging actions.

2. The spherical rotor anti-adhesion air lock discharger according to claim 1, characterized in that: A sealing structure (40) is provided in the housing (10), the sealing structure (40) comprising sealing rings (41) provided at the ends of the feed pipe (11) and the discharge pipe (12), the sealing rings (41) being sealingly connected to the spherical rotor (20), the diameter of the sealing ring (41) being set corresponding to the size of the opening (21) of the spherical rotor (20).

3. The spherical rotor anti-adhesion air lock discharger according to claim 2, characterized in that: The sealing structure (40) comprises a sealing body (42) arranged in a housing (10); the sealing body (42) is an annular structure having an arc-shaped sealing surface (43); the arc of the arc-shaped sealing surface (43) is arranged to correspond to the spherical surface of the spherical rotor (20); the spherical rotor (20) is sealedly connected to the housing (10) via the arc-shaped sealing surface (43).

4. The spherical rotor anti-adhesion air lock discharger according to claim 2, characterized in that: An elastic member (44) is provided between the sealing structure (40) and the housing (10), so that the sealing structure (40) is elastically connected to the spherical rotor (20), so that the sealing structure (40) has a self-adaptive adjustment capability.

5. The spherical rotor anti-adhesion air lock discharger according to claim 1, characterized in that: A cleaning structure for cleaning materials is arranged inside the spherical rotor (20), the cleaning structure comprising a cleaning arm (51) arranged corresponding to the spherical surface of the inner wall of the spherical rotor (20), the cleaning arm (51) being an arc-shaped rod-shaped structure arranged close to the inner wall of the spherical rotor (20), and the cleaning arm (51) does not rotate synchronously with the spherical rotor (20).

6. The spherical rotor anti-adhesion air lock discharger according to claim 5, characterized in that: The cleaning arm (51) is fixedly connected to the housing (10), a fixing seat (52) is provided on the housing (10), a fixing shaft (53) is fixedly provided on the cleaning arm (51), the fixing shaft (53) penetrates the spherical rotor (20) from the side and is fixedly connected to the fixing seat (52), and the spherical rotor (20) is rotatably connected to the fixing shaft (53).

7. The spherical rotor anti-adhesion air lock discharger according to claim 5, characterized in that: The cleaning arm (51) is rotatably connected to the housing (10); the output shaft (31) of the power device (30) is fixedly connected to the spherical rotor (20); an extended end of the output shaft (31) passes through the spherical rotor (20) and is transmission-connected to the cleaning arm (51) via a planetary gear assembly (54); the planetary gear assembly (54) comprises a driving gear (541) fixedly connected to the output shaft (31); the driving gear (541) is circumferentially meshed with a plurality of planetary gears (542); the plurality of planetary gears (542) are all fixedly connected to a planet carrier (543); the planet carrier (543) is fixedly connected to the housing (10); the outer sides of the planetary gears (542) are meshed with a driven ring gear (544); the cleaning arm (51) is fixedly connected to the driven ring gear (544).

8. The spherical rotor anti-adhesion air lock discharger according to claim 7, characterized in that: The inner side of the driven gear ring (544) is covered with a sealing plate (55), the sealing plate (55) is connected to the side of the spherical rotor (20) in a sliding sealing manner, and the sealing plate (55) is connected to the output shaft (31) of the power device (30) in a rotating sealing manner.

9. The spherical rotor anti-adhesion air lock discharger according to claim 1, characterized in that: An anti-jamming plate (13) is arranged in the feed pipe (11). The anti-jamming plate (13) is an arc-shaped plate structure with a certain taper, and is used to guide the material flowing through the feed pipe (11). Two anti-jamming plates (13) are arranged, respectively on the front and rear sides corresponding to the rotation direction of the spherical rotor (20).

10. A discharging method, characterized in that: The method is implemented based on the spherical rotor anti-adhesion air lock discharger according to claim 1, and comprises the following steps: The material enters the feed pipe (11) from the external conveying equipment, and the power device (30) drives the spherical rotor (20) to rotate in the housing (10). When the opening (21) of the spherical rotor (20) is upward, the opening (21) is connected with the feed pipe (11), and the material enters the storage cavity of the spherical rotor (20) through the opening (21). The spherical rotor (20) continues to rotate while carrying the material. When the opening (21) is downwardly connected with the discharge pipe (12), the material in the storage cavity falls due to gravity and is discharged through the discharge pipe (12), completing the unloading.

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