Dust suppression type unpowered grain conveying device

Abstract

The invention relates to the technical field of grain conveying, and discloses a dust suppression type unpowered grain conveying device which comprises a charging barrel and a discharging hopper, a discharging channel is formed in the center of the lower end of the discharging hopper, a cover plate is arranged at the upper end of the charging barrel, a feeding hopper is arranged on the upper side of the cover plate, and a plurality of flow guide pipes distributed in the circumferential direction are arranged on the feeding hopper; a shaft body assembly is arranged in the center of the charging barrel, a hopper core assembly is arranged at the lower end of the shaft body assembly, a conical surface is arranged at the lower end of the hopper core assembly, and an annular discharging gap is formed between the conical surface and the inner wall of the discharging hopper; a connecting sleeve is arranged in the center of the bottom face of the cover plate, the shaft body assembly penetrates through the connecting sleeve to form rotary connection, a plurality of blades obliquely distributed in the circumferential direction are arranged on the side face of the upper end of the bucket core assembly, the lower end of the flow guide pipe faces the blades, and a rotary lifting mechanism is arranged between the connecting sleeve and the shaft body assembly. The device has the beneficial effects that the opening degree of the annular discharging gap can be adjusted in a self-adaptive mode according to grain flow, and dust is prevented from escaping along with the grain flow.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grain conveying, in particular to a dust-suppression type unpowered grain conveying device. BACKGROUND

[0002] In the field of grain storage, the amount of grain entering and leaving the warehouse is very large every year, and it is usually necessary to use a grain conveying hopper to cooperate with a conveying line to realize the operation of grain entering and leaving the warehouse and loading onto a vehicle (ship). Since the grain contains a certain proportion of impurities, when the grain is loaded onto a vehicle through the conveying line and the hopper, the impurities (dust) in the grain will spread to the surrounding environment with the airflow as the grain falls, resulting in a dusty operation environment; the escape of impurities in the grain will also cause the grain to lose weight, thereby causing grain loss.

[0003] The dust-suppression hopper in the prior art uses a spring to control the opening degree of the discharge port according to the weight of the material to keep the material in the discharge port sufficient, thereby reducing the escape of dust. For example, Chinese Patent No. 2024211744141, published on February 7, 2025, discloses a unpowered dust-suppression environmental protection hopper, which connects the conical hopper body through a tension spring. When the material flow is large, the conical hopper body is pressed, causing the spring to be stretched, thereby adjusting the gap between the hopper body and the core, keeping the material flow stable at the annular gap, and reducing the escape of dust. When the incoming material flow is relatively stable, it can indeed play a dust-suppression role, but when the material flow fluctuates greatly, the conical hopper body will frequently vibrate elastically under the action of the spring, and this elastic vibration will cause airflow fluctuations, thereby causing more dust to escape around the discharge port. SUMMARY

[0004] The present application provides a dust-suppression type unpowered grain conveying device that can adaptively adjust the opening degree of the annular discharge gap according to the size of the grain flow, keep the grain full in the annular discharge gap, and reduce the escape of dust with the airflow, in order to solve the above-mentioned problems in the prior art.

[0005] In order to achieve the above-mentioned purposes, the present application adopts the following technical solutions: A dust suppression type non-powered grain feeding device comprises a barrel, a conical discharge hopper arranged at the lower end of the barrel, a discharge channel is provided at the center of the lower end of the discharge hopper, a cover is provided at the upper end of the barrel, a feed hopper is provided on the upper side of the cover, a plurality of guide pipes distributed along the circumference are provided on the feed hopper, the lower ends of the guide pipes extend into the barrel; a shaft assembly is provided at the center of the barrel, a bucket core assembly is provided at the lower end of the shaft assembly, a conical surface is provided at the lower end of the bucket core assembly, and an annular discharge gap is formed with the conical surface and the inner wall of the discharge hopper; a connecting sleeve is provided at the center of the bottom surface of the cover, The shaft assembly passes through the connecting sleeve to form a rotating connection, and a plurality of blades distributed along the circumferential direction are provided on the upper end side of the bucket core assembly. The lower end of the guide tube faces the blades, and a rotating lifting mechanism is provided between the connecting sleeve and the shaft assembly; when the impact force of the grain flow at the lower end of the guide tube acts on the blades to drive the bucket core assembly and the shaft assembly to rotate, the shaft assembly is lifted upward by the rotating lifting mechanism, so that the annular discharge gap increases; when the grain flow at the lower end of the guide tube decreases, the bucket core assembly descends under the action of its own gravity, so that the annular discharge gap decreases.

[0006] By adopting the above technical solution: the greater the grain flow at the lower end of the guide tube, the greater the impact force, the grain flow acts on the blades to drive the bucket core assembly and the shaft assembly to rotate, and the bucket core assembly is driven to rise through the rotating lifting mechanism during rotation, thereby increasing the annular discharge gap, that is, the greater the grain flow, the larger the annular discharge gap; when the grain flow decreases and cannot drive the bucket core assembly to rotate, the bucket core assembly descends to reduce the annular discharge gap; on the one hand, this type of grain conveying device can adaptively adjust the size of the annular discharge gap according to the size of the grain flow, so that the grain flow is kept tight at the discharge gap, preventing a large amount of dust-laden airflow from being discharged together with the grain flow; on the other hand, when the grain flow drives the bucket core to rotate, the power of the grain flow is lost, thereby reducing the flow rate of the grain flow at the discharge channel, further achieving a dust suppression effect.

[0007] Preferably, the feed hopper has a bell mouth at its upper end and an inverted cone at its lower end. The guide tube is configured as a spiral tube, with its upper end communicating with the inverted cone and its lower end extending tangentially along the inner wall of the barrel. The bell mouth interfaces with the grain conveyor line to better receive grain flow from the conveyor line's discharge end. The spiral tube better directs flow onto the blades, driving the hopper core to rotate in one direction.

[0008] As preferred, the bottom center of the cover plate is provided with a lower bearing seat fixed with the connecting sleeve, the lower bearing seat is provided with a linear bearing, the top center of the cover plate is provided with an upper bearing seat, the upper bearing seat is provided with a thrust bearing, the upper end of the shaft body assembly passes through the thrust bearing, the shaft body assembly passes through the linear bearing and the thrust bearing in sequence, and the upper end of the shaft body assembly is fixed with a check ring above the thrust bearing. The linear bearing and the thrust bearing cooperate, so as to ensure the stable rotation of the shaft body assembly and the circumferential displacement of the shaft body assembly.

[0009] As preferred, the upper end of the shaft body assembly slides through the feeding hopper, and the upper end of the shaft body assembly is provided with a plurality of raking rods at the position in the feeding hopper. The feeding hopper is connected with a plurality of guide pipes, and the raking rods rotate when the core assembly and the shaft body assembly rotate, so as to assist the grain flow to be distributed into the guide pipes and prevent the material from being blocked.

[0010] As preferred, the rotating and lifting mechanism comprises a spiral groove arranged on the circumferential surface of the connecting sleeve and a pin shaft arranged on the shaft body assembly and capable of moving along the spiral groove. When the impact force of the material on the blade cannot drive the core assembly to rotate, the pin shaft is located at the lowermost end of the spiral groove. When the impact force of the material on the blade drives the core assembly to rotate, the pin shaft rises along the spiral groove to drive the core assembly to lift, so that the annular discharging gap is increased. When the core assembly rotates, the pin shaft rotates along the spiral groove to drive the core assembly to lift and increase the annular discharging gap. When the grain flow decreases and cannot drive the core assembly to rotate, the pin shaft descends along the spiral groove under the action of gravity, so that the annular discharging gap is reduced.

[0011] As preferred, the spiral groove is arranged in two groups, the two groups of spiral grooves are symmetrically distributed about the axis center of the connecting sleeve, and the two ends of the pin shaft extend into the two groups of spiral grooves, respectively. The two ends of the pin shaft are both provided with a needle bearing capable of moving along the spiral groove. The two ends of the pin shaft cooperate with the needle bearings to move in the two groups of spiral grooves, so that the overall stress is more uniform and the movement is more smooth.

[0012] Preferably, the shaft assembly includes an outer shaft body and an inner shaft body, the center of the outer shaft body is provided with a center hole, the inner shaft body is slidably inserted into the center hole, the pin shaft is arranged on the inner shaft body, and a vertical slot hole is provided on the outer shaft body corresponding to the pin shaft, the end of the pin shaft passes through the vertical slot hole and extends into the spiral groove, and the lower end of the spiral groove is provided with a vertically distributed limiting groove connected to the spiral groove; the bucket core assembly includes an upper bucket core and a lower bucket core slidably provided at the lower end of the upper bucket core, the lower end of the inner shaft body is connected to the lower bucket core, and the conical surface is provided at the lower end of the lower bucket core; when the conical surface is not subjected to material pressure, the pin shaft is in the limiting groove, and the bucket core assembly cannot rotate; when the annular discharging gap is filled with material and the conical surface is pressurized, the lower bucket core drives the inner shaft body to rise so that the pin shaft moves upward into the spiral groove. At this time, when the bucket core assembly rotates, the pin shaft can move upward along the spiral groove and lift the bucket core assembly. When the grain flow is too small to push the bucket core assembly to rotate, the pin shaft is in the limit groove. When the grain flow increases instantaneously, the pin shaft is limited by the limit groove and the bucket core assembly cannot rotate. Only when the annular discharge gap is filled with grain and pressure is generated on the conical surface of the lower bucket core, the lower bucket core is pressurized and drives the inner shaft (pin shaft) to rise a certain displacement, so that the pin shaft moves upward from the limit groove and enters the spiral groove. Only then can the bucket core assembly be lifted, thereby preventing the grain flow from increasing instantaneously and the annular discharge gap from increasing instantaneously, causing dust to escape.

[0013] Preferably, a concave cavity is provided at the lower end of the upper bucket core, the lower bucket core is slidably arranged in the concave cavity, a compression spring is provided in the concave cavity, and the lower bucket core is rotationally connected to the inner shaft body.

[0014] Preferably, a protective sleeve is provided on the outer side of the connecting sleeve to protect the spiral groove and prevent grain from entering the spiral groove and causing it to get stuck.

[0015] Therefore, the present invention has the following beneficial effects: (1) The entire device has no power source, which is more convenient and energy-saving to use; (2) The grain flow in the feed hopper is diverted through the guide pipe and acts on the blades. When the grain flow is large, it can drive the bucket core assembly to rotate, converting the kinetic energy of the grain flow into the kinetic energy of the bucket core assembly, thereby reducing the flow rate of the grain flow and reducing dust leakage; (2) The opening of the annular discharge gap is adaptively adjusted according to the size of the grain flow to ensure that the annular discharge gap is filled with grain, thereby preventing the dust in the barrel from escaping with the grain flow; (3) After the annular discharge gap is filled with grain, the grain flow discharged from the discharge channel is distributed in an annular curtain shape, thereby enclosing the dust inside the annular grain flow, thereby reducing dust leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 for Figure 1 front view of the

[0018] Figure 3 is Figure 2 sectional view at A-A in

[0019] Figure 4 is Figure 1 exploded view of the

[0020] Figure 5 is a schematic view of the internal structure of the barrel.

[0021] Figure 6 is a schematic view of the pin shaft in the limiting groove and the core assembly in the stationary state.

[0022] Figure 7 is Figure 6 sectional view at B-B in

[0023] Figure 8 is a schematic view of the lower core being driven to rise to make the pin shaft enter the lower end of the helical groove.

[0024] Figure 9 is a schematic view of the pin shaft rising along the helical groove when the grain flow drives the core assembly to rotate.

[0025] Figure 10 exploded view of the core assembly.

[0026] Figure 11 is an exploded view of the shaft body assembly.

[0027] Figure 12 is a schematic view of the increased opening of the annular discharge gap when the core assembly is lifted. DETAILED DESCRIPTION

[0028] In order to make the technical problems to be solved by the present application, the technical solutions and the beneficial technical effects more clear and explicit, the present application will be further described in detail below in combination with the drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the protection scope of the present application.

[0029] It should be understood that, in this document, the expressions "first", "second", etc. are only used for descriptive purposes, and should not be understood as indicating or implying relative importance, nor should it be understood as implicitly indicating the number of the technical features indicated. The features with "first", "second" can explicitly or implicitly indicate that at least one such feature is included.

[0030] As Figure 1-Figure 7The dust suppression type non-powered grain feeding device shown in the figure comprises a barrel 1, a conical discharge hopper 2 provided at the lower end of the barrel 1, a discharge channel 21 is provided at the center of the lower end of the discharge hopper 2, a cover plate 3 is provided at the upper end of the barrel 1, a feed hopper 4 is provided on the upper side of the cover plate 3, a plurality of guide pipes 5 distributed along the circumferential direction are provided on the feed hopper 4, and the lower end of the guide pipe 5 extends into the barrel 1; a shaft assembly 6 is provided at the center of the barrel 1, a bucket core assembly 7 is provided at the lower end of the bucket core assembly 7, a conical surface 701 is provided at the lower end of the bucket core assembly 7, and the conical surface 701 forms an annular discharge gap 22 with the inner wall of the discharge hopper 2; the bottom surface of the cover plate 3 is provided at the center The connecting sleeve 8, the shaft assembly 6 passes through the connecting sleeve 8 to form a rotational connection, the upper end side of the bucket core assembly 7 is provided with a plurality of blades 70 distributed along the circumferential direction, the lower end of the guide pipe 5 faces the blades 70, and a rotating lifting mechanism 9 is provided between the connecting sleeve 8 and the shaft assembly 6; when the impact force of the grain flow at the lower end of the guide pipe 5 acts on the blades 70 to drive the bucket core assembly 7 and the shaft assembly 6 to rotate, the shaft assembly 6 is lifted upward by the action of the rotating lifting mechanism 9, so that the annular discharge gap 22 increases; when the grain flow at the lower end of the guide pipe 5 decreases, the bucket core assembly 7 descends under the action of its own gravity, so that the annular discharge gap 22 decreases.

[0031] The feed hopper 4 has a bell mouth 41 at its upper end and an inverted cone 42 at its lower end. The flow guide tube 5 is configured as a spiral tube, with its upper end communicating with the inverted cone 42 and its lower end extending tangentially along the inner wall of the barrel 1. In this embodiment, four flow guide tubes are provided, and the bucket core assembly has four blades, with the lower ends of the four flow guide tubes corresponding to the four blades.

[0032] like Figure 7 As shown, a lower bearing seat 31 fixed to the connecting sleeve 8 is provided at the center of the bottom surface of the cover plate 3. A linear bearing 32 is provided in the lower bearing seat 31. An upper bearing seat 33 is provided at the center of the top surface of the cover plate 3. A thrust bearing 34 is provided in the upper bearing seat 33. The upper end of the shaft assembly 6 passes through the thrust bearing 34. The shaft assembly 6 passes through the linear bearing 32 and the thrust bearing 34 in sequence. A retaining ring 35 is fixed on the shaft assembly 6 on the upper side of the thrust bearing 34. The upper end of the shaft assembly 6 slides through the feed hopper 4. A plurality of material-moving rods 43 are provided at the position of the upper end of the shaft assembly 6 located inside the feed hopper 4.

[0033] like Figure 6The rotary lifting mechanism 9 shown includes a spiral groove 91 formed on the circumferential surface of the connecting sleeve 8 and a pin 92 mounted on the shaft assembly 6 and movable along the spiral groove 91. When the impact force of the material on the blades 70 is unable to drive the bucket core assembly 7 to rotate, the pin 92 is at the lowest end of the spiral groove 91. When the impact force of the material on the blades 70 drives the bucket core assembly 7 to rotate, the pin 92 rises along the spiral groove 91, driving the bucket core assembly 7 upward, thereby increasing the annular discharge gap 22. A protective cover 81 is provided on the outer side of the connecting sleeve 8.

[0034] In some embodiments, the spiral grooves 91 are configured into two groups, and the two groups of spiral grooves 91 are symmetrically distributed about the axis center of the connecting sleeve 8, and the two ends of the pin shaft 92 respectively extend into the two groups of spiral grooves 91; both ends of the pin shaft 92 are provided with needle bearings 93 that can move along the spiral grooves 91.

[0035] like Figure 7 、 Figure 10 and Figure 11 As shown, the shaft assembly 6 includes an outer shaft 61 and an inner shaft 62. The center of the outer shaft 61 is provided with a center hole 610. The inner shaft 62 is slidably inserted into the center hole 610. The pin 92 is provided on the inner shaft 62. A vertical slot hole 611 is provided on the outer shaft 61 at a position corresponding to the pin 92. The end of the pin 92 passes through the vertical slot hole 611 and extends into the spiral groove 91. The lower end of the spiral groove 91 is provided with a vertically distributed limit groove 910 connected to the spiral groove 91; the bucket core assembly 7 includes an upper bucket core 71, a sliding member provided at the lower end of the upper bucket core 71 The lower bucket core 72, the lower end of the inner shaft 62 is connected to the lower bucket core 72, and the conical surface 701 is set at the lower end of the lower bucket core 72; when the conical surface 701 is not subjected to material pressure, the pin shaft 92 is in the limit groove, and the bucket core assembly 7 cannot rotate; when the annular discharge gap 22 is filled with material so that the conical surface 701 is pressurized, the lower bucket core 72 drives the inner shaft 62 to rise so that the pin shaft 92 moves upward and enters the spiral groove 91. At this time, when the bucket core assembly 7 rotates, the pin shaft 92 can move upward along the spiral groove 91 and lift the bucket core assembly 7.

[0036] A concave cavity 710 is provided at the lower end of the upper bucket core 71 , and the lower bucket core 72 is slidably disposed in the concave cavity 710 . A compression spring 73 is provided in the concave cavity 710 , and the lower bucket core 72 is rotationally connected to the inner shaft body 62 .

[0037] In conjunction with the accompanying drawings, the principle of the present invention is as follows: the initial state of the bucket core assembly 7 is as follows: Figure 5As shown, after the grain flow on the grain conveying line enters the feed hopper 4, the grain flow is guided into the barrel 1 through multiple guide tubes 5 and acts on the blades. In the initial state, since the grain in the annular discharge gap 22 is not full, the lower bucket core is not under pressure and the pin shaft 92 is in the limit groove 910. At this time, no matter how much impact force the blade is subjected to, it will not drive the bucket core assembly 7 to rotate; as the grain in the annular discharge gap 22 is gradually filled, the conical surface 701 at the lower end of the lower bucket core 72 is under pressure, causing the lower bucket core to drive the inner shaft body to rise a certain displacement, thereby driving the pin shaft 92 to move upward to Figure 8 In the state shown, when the blade is subjected to the impact force of the grain flow (reaching the preset value), the bucket core assembly rotates, causing the pin to move along the spiral groove 91. The moving state is as shown in FIG. Figure 9 As shown, at this time, the bucket core assembly is lifted, and after the bucket core assembly is lifted, the opening of the annular discharge gap 22 increases to Figure 12 As shown; when the grain flow in the guide tube decreases, that is, the impact force of the grain flow on the blade is less than the preset value, the bucket core assembly moves downward along the spiral groove under the action of gravity to the position shown in FIG. Figure 8 The state shown causes the opening of the annular discharge gap 22 to decrease; by rotating and lifting the bucket core assembly, the opening of the annular discharge gap 22 is adaptively adjusted to keep the grain filling the annular discharge gap 22 and prevent the dust in the barrel from escaping with the grain flow at the discharge channel.

[0038] In the description of the present invention, it should be understood that the directions or positional relationships indicated by up, down, left, right, inner end, outer end, one end, the other end, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of more clearly describing the technical solution of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific orientation, and cannot be understood as a limitation of the present invention.

[0039] Although specific embodiments of the present invention are described in detail herein, they are provided for illustrative purposes only and should not be considered to limit the scope of the present invention. Various substitutions, changes, and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. A dust suppression type unpowered grain conveying device, characterized in that: The invention comprises a barrel (1), a conical discharge hopper (2) provided at the lower end of the barrel (1), a discharge channel (21) provided at the center of the lower end of the discharge hopper (2), a cover plate (3) provided at the upper end of the barrel (1), a feed hopper (4) provided on the upper side of the cover plate (3), a plurality of guide tubes (5) distributed along the circumferential direction provided on the feed hopper (4), and the lower ends of the guide tubes (5) extending into the barrel (1); The center of the barrel (1) is provided with a shaft assembly (6), the lower end of the shaft assembly (6) is provided with a bucket core assembly (7), the lower end of the bucket core assembly (7) is provided with a cone surface (701), and the cone surface (701) and the inner wall of the discharge hopper (2) form an annular discharge gap (22); A connecting sleeve (8) is provided at the center of the bottom surface of the cover plate (3), the shaft assembly (6) passes through the connecting sleeve (8) to form a rotational connection, a plurality of blades (70) distributed along a circumferential tilt are provided on the upper end side surface of the bucket core assembly (7), the lower end of the guide tube (5) faces the blades (70), and a rotating lifting mechanism (9) is provided between the connecting sleeve (8) and the shaft assembly (6); When the impact force of the grain flow at the lower end of the guide tube (5) on the blades (70) drives the bucket core assembly (7) and the shaft assembly (6) to rotate, the shaft assembly (6) is lifted upward under the action of the rotating lifting mechanism (9), thereby increasing the annular discharge gap (22); when the grain flow at the lower end of the guide tube (5) decreases, the bucket core assembly (7) descends under the action of its own gravity, thereby reducing the annular discharge gap (22).

2. A dust suppression type unpowered grain conveying device according to claim 1, characterized in that: The upper end of the feed hopper (4) is provided with a bell mouth (41), the lower end of the feed hopper (4) is provided with an inverted cone portion (42), the guide tube (5) is configured as a spiral tube, the upper end of the guide tube (5) is connected to the inverted cone portion (42), and the lower end of the guide tube (5) is distributed along the tangential direction of the inner wall of the barrel (1).

3. A dust suppression type unpowered grain conveying device according to claim 1 or 2, characterized in that: A lower bearing seat (31) fixed to the connecting sleeve (8) is provided at the center of the bottom surface of the cover plate (3), and a linear bearing (32) is provided in the lower bearing seat (31). An upper bearing seat (33) is provided at the center of the top surface of the cover plate (3), and a thrust bearing (34) is provided in the upper bearing seat (33). The upper end of the shaft assembly (6) passes through the thrust bearing (34), and the shaft assembly (6) passes through the linear bearing (32) and the thrust bearing (34) in sequence. A retaining ring (35) is fixed on the shaft assembly (6) on the upper side of the thrust bearing (34).

4. A dust suppression type unpowered grain conveying device according to claim 3, characterized in that: The upper end of the shaft assembly (6) slides through the feed hopper (4), and a plurality of material shifting rods (43) are provided at the portion of the upper end of the shaft assembly (6) located inside the feed hopper (4).

5. The dust suppression type unpowered grain conveying device according to claim 1, characterized in that: The rotary lifting mechanism (9) comprises a spiral groove (91) provided on the circumferential surface of the connecting sleeve (8), and a pin (92) provided on the shaft assembly (6) and movable along the spiral groove (91); When the material impact force applied to the blade (70) is unable to drive the bucket core assembly (7) to rotate, the pin shaft (92) is at the lowest end of the spiral groove (91); when the material impact force applied to the blade (70) drives the bucket core assembly (7) to rotate, the pin shaft (92) rises along the spiral groove (91) to drive the bucket core assembly (7) to rise, thereby increasing the annular discharge gap (22).

6. A dust suppression type unpowered grain conveying device according to claim 5, characterized in that: The spiral grooves (91) are configured into two groups, and the two groups of spiral grooves (91) are symmetrically distributed about the axis center of the connecting sleeve (8). The two ends of the pin shaft (92) respectively extend into the two groups of spiral grooves (91); and the two ends of the pin shaft (92) are provided with needle bearings (93) that can move along the spiral grooves (91).

7. A dust suppression type unpowered grain conveying device according to claim 5 or 6, characterized in that: The shaft assembly (6) includes an outer shaft (61) and an inner shaft (62), wherein a center hole (610) is provided at the center of the outer shaft (61), and the inner shaft (62) is slidably inserted into the center hole (610), and the pin shaft (92) is provided on the inner shaft (62), and a vertical slot hole (611) is provided on the outer shaft (61) at a position corresponding to the pin shaft (92), and the end of the pin shaft (92) passes through the vertical slot hole (611) and extends into the spiral groove (91), and a vertically distributed limiting groove (910) is provided at the lower end of the spiral groove (91); The bucket core assembly (7) includes an upper bucket core (71) and a lower bucket core (72) slidably arranged at the lower end of the upper bucket core (71); the lower end of the inner shaft (62) is connected to the lower bucket core (72); and the conical surface (701) is arranged at the lower end of the lower bucket core (72); When the conical surface (701) is not subjected to material pressure, the pin shaft (92) is in the limiting groove and the bucket core assembly (7) cannot rotate; when the annular discharge gap (22) is filled with material and the conical surface (701) is pressurized, the lower bucket core (72) drives the inner shaft (62) to rise so that the pin shaft (92) moves upward and enters the spiral groove (91). At this time, when the bucket core assembly (7) rotates, the pin shaft (92) can move upward along the spiral groove (91) and lift the bucket core assembly (7).

8. A dust suppression type unpowered grain conveying device according to claim 7, characterized in that: A concave cavity (710) is provided at the lower end of the upper bucket core (71), and the lower bucket core (72) is slidably arranged in the concave cavity (710). A compression spring (73) is provided in the concave cavity (710), and the lower bucket core (72) is rotatably connected to the inner shaft (62).

9. A dust suppression type unpowered grain conveying device according to claim 5 or 6, characterized in that: A protective sleeve (81) is provided on the outside of the connecting sleeve (8).

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