Quantitative feeding mechanism

Abstract

The utility model belongs to the related technical field of heat treatment accessory equipment, and particularly relates to a quantitative feeding mechanism. The quantitative feeding mechanism comprises a spiral conveying pipeline (10) and a feeding bin (20), a bin opening adjusting valve (30) is arranged on the lower portion of the feeding bin (20), and the bin opening adjusting valve (30) comprises a guide plate body (31), a plate body shell (32) and a first driving piece (33) driving the guide plate body (31) to move in the plate body shell (32); and the guide plate body (31) can be driven by the first driving piece (33) to change the shielding area of the feeding bin (20). The device has high adaptability to the moisture content of materials, and through the arrangement of the conveying pipe opening degree adjusting valve and the stock bin opening degree adjusting valve, not only can arching of dry materials at the bottom of the stock bin be damaged or prevented, falling of the dry materials is promoted, the discharging speed of wet materials is controlled, but also external air can be prevented from being directly communicated with a follow-up pipeline.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the related technical field of heat treatment accessory equipment, and particularly relates to a quantitative feeding mechanism. BACKGROUND

[0002] In the field of heat treatment, due to different sources of materials, the water content fluctuates greatly. Generally, the water content of the material is required to be below 30% so that the material can enter the feeding screw through the quantitative bin to realize quantitative conveying of the material. However, in engineering practice, the water content of part of the material may increase to a flow state. At this time, the quantitative feeding cannot be realized by controlling the rotating speed of the feeding screw. On the other hand, when the water content of the material is low, the quantitative bin is easy to form an arch at the bottom, which leads to the adverse consequence of preventing the material from falling smoothly to the feeding screw.

[0003] Chinese patent document CN110884915A discloses an air inlet prevention bin. The bin body of the air inlet prevention bin has a bin body feeding port and a bin body discharging port. The bin body discharging port is connected in communication with a material conveying pipeline in which a spiral conveying shaft is arranged. There is a material falling space between the outer cylindrical surface of the spiral conveying shaft and the bin body discharging port. A guide baffle is arranged in the material falling space. The gap between the lower edge of the guide baffle and the outer cylindrical surface of the spiral conveying shaft is adjustable. When the guide baffle moves downward relative to the spiral conveying shaft, the blocking cross section of the material conveying pipeline can be increased, and the conveying speed of the material can be reduced. When the water content of the material is high, this scheme can help to control the flow rate of the material in the material conveying pipeline to a certain extent. However, when the water content of the material further increases to make the material in a flow state, the control effect of the guide baffle will be invalid.

[0004] Chinese patent document CN116395287A discloses an anti-bridging feeding device. The anti-bridging feeding device includes a feeding pipeline. An active interception part is arranged on the feeding pipeline. The active interception part moves back and forth at intervals under the action of external power, so that the feeding pipeline realizes intermittent opening or closing. This scheme changes the feeding mode of the quantitative bin from continuous feeding to intermittent feeding. The active interception part intercepts the material. After a certain amount of material is accumulated on the active interception part, the material is discharged at one time. This material falling method increases the weight of the material discharged at one time, which can reduce the probability of the occurrence of the bridging phenomenon. In addition, a drooping part is additionally arranged on the active interception part. The drooping part moves horizontally every certain period of time along with the active interception part, which prevents the bridging phenomenon from occurring in the reduced diameter part, and can also accelerate the falling of the material.

[0005] In the prior art, although the water content range of the material is considered at the beginning of the design of the quantitative bin, the actual material often has unpredictability. When the water content of the material exceeds the designed range, how to continue to effectively control the feeding speed of the material is a problem that must be faced by practical workers. SUMMARY

[0006] The utility model discloses a purpose at overcoming prior art's insufficient, provide a kind of quantitative feeding mechanism suitable for dry and wet material feeding, not only can prevent dry material to be accumulated into arch at the bottom of bunker, when material is in flow state, material supply speed can also be effectively controlled.

[0007] The utility model discloses a scheme for solving the technical problem:

[0008] Quantitative feeding mechanism, including

[0009] Spiral conveying pipeline, be equipped with the spiral shaft for pushing material in it;

[0010] Feeding bunker, it is set to one end of spiral conveying pipeline and is communicated with spiral conveying pipeline, so that material can enter spiral conveying pipeline via feeding bunker;

[0011] Further comprising

[0012] Bunker opening degree regulating valve, it is set to the lower part of feeding bunker, including guide plate body, plate body shell, the first driving piece of driving guide plate body moves in plate body shell;Guide plate body can change the area of feeding bunker under the drive of first driving piece.

[0013] The application concept is that: bunker opening degree regulating valve is arranged at the lower part of feeding bunker, the position of guide plate body in feeding bunker is different, and the opening degree of feeding bunker is different. When the bottom of the feeding bunker forms an arched accumulation of the material, the movement of the guide plate body can destroy the arched structure and prevent the material from arching. Secondly, when the moisture content of the material is low, the movement of the guide plate body can also apply a pushing action to the material at the bottom of the bunker, promoting the falling of the bottom material. When the moisture content of the material is high, the area of the feeding bunker blocked by the guide plate body can be increased, the cross-sectional area of the material passage can be reduced, and the flow of the liquid material can be prevented, facilitating the control of the feeding speed of the liquid material. This scheme improves the adaptability of the quantitative feeding mechanism to the moisture content of the material.

[0014] As an improvement, the guide plate body is inclined, and when the bottom of the guide plate body is located at the bottom of the feeding bunker, the passage cross section of the feeding bunker is in a flow-off state.

[0015] The guide plate body is inclined, and when the moisture content of the material is low, the downward pressure exerted by the movement of the guide plate body on the material at the bottom of the bunker increases, which helps the falling of the material. Secondly, the inclined guide plate body can be inserted into the bottom of the bunker, which can more effectively destroy the arched structure formed by the dry material at the bottom of the bunker.

[0016] As another improvement, the guide plate body is horizontally arranged, and the distance between the guide plate body and the bottom of the feeding bunker is not greater than 20 cm. When the guide plate body is horizontally arranged, the distance between the guide plate body and the bottom of the bunker should be limited. If the value is too large, the arched structure formed by the material cannot be destroyed.

[0017] As a further improvement, the conveying pipe opening adjusting valve is arranged on the spiral conveying pipeline and comprises a blocking plate body and a second driving member for driving the blocking plate body to move in the spiral conveying pipeline; when the blocking plate body moves in the spiral conveying pipeline, the gap between the lower edge of the blocking plate body and the outer surface of the spiral shaft is adjustable.

[0018] When the moisture content of the material is high, the conveying pipe opening adjusting valve can cooperate with the bunker opening adjusting valve to form two-stage control on the feeding speed of the liquid material, at this time, the opening of the bunker can be appropriately increased, which is beneficial to the formation of material accumulation between the conveying pipe opening adjusting valve and the bunker opening adjusting valve, and prevents the direct communication of external gas with the subsequent pipeline.

[0019] As an improvement, the feeding bunker has two parallel arranged discharge ports, and each discharge port is connected with a set of spiral conveying pipeline. The two discharge ports are beneficial to increase the discharge speed of the feeding bunker and reduce the probability of material accumulation at the bottom of the bunker.

[0020] As a further improvement, the feeding bunker is provided with a raking plate body in the middle of the top, and the raking plate body can reciprocate under the action of a raking driving member. The raking plate body is beneficial to the relatively uniform output of the material in the same feeding bunker from the two discharge ports.

[0021] The utility model discloses the beneficial effects of having simple structure, processing and control are convenient, and have higher adaptability to the moisture content of material. Through the setting of the conveying pipe opening adjusting valve and the bunker opening adjusting valve, not only can the arching of dry material at the bottom of the bunker be destroyed or prevented and the falling of dry material be promoted, but also the discharge speed of wet material can be controlled, and direct communication of external gas with the subsequent pipeline can be prevented. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structural schematic view of the utility model embodiment 1;

[0023] Figure 2 It is the front view and plan view of the bunker opening adjusting valve of the utility model;

[0024] Figure 3 It is Figure 1 the sectional view of A-A direction;

[0025] Figure 4 It is Figure 3 the enlarged view of B part;

[0026] Figure 5 It is the structural schematic view of the utility model embodiment 2.

[0027] In the diagram: 10. Screw conveyor pipeline; 11. Screw shaft; 20. Feed hopper; 21. Discharge port; 30. Hopper opening regulating valve; 31. Guide plate; 32. Plate shell; 33. First drive component; 34. Filling block; 40. Conveying pipe opening regulating valve; 41. Intercepting plate; 42. Second drive component; 50. Feeding plate; 51. Feeding drive component. Detailed Implementation Example 1

[0028] like Figure 1 As shown, the quantitative feeding mechanism described in this application includes a screw conveyor pipe 10 and a feeding hopper 20. The bottom of the feeding hopper 20 is fixed to the inlet end of the screw conveyor pipe 10 and communicates with the screw conveyor pipe 10. The other end of the screw conveyor pipe 10 is the outlet end. The screw conveyor pipe 10 is provided with a screw shaft 11 for pushing the material, which is used to transport the material from the inlet end to the outlet end. When the material has a high moisture content and is in a liquid state, it does not need to be pushed by the screw shaft 11 and flows directly from the inlet end to the outlet end of the screw conveyor pipe 10.

[0029] A hopper opening regulating valve 30 is fixed on the feed hopper 20. For example... Figure 2 As shown, the hopper opening regulating valve 30 includes a guide plate 31, a plate housing 32, and a first driving element 33. Both the guide plate 31 and the plate housing 32 are inclined, with an inclination angle of 30° to the horizontal plane. The plate housing 32 is fixed to the outer wall of the feed hopper 20 and extends towards the discharge end of the screw conveyor pipe 10. The first driving element 33 is an adjustable electric actuator. Under the drive of the first driving element 33, the guide plate 31 can extend from or retract into the plate housing 32. When the guide plate 31 extends from the plate housing 32, it can block the discharge area of ​​the feed hopper 20. When the bottom of the guide plate 31 is located at the bottom of the feed hopper 20, the channel section of the feed hopper 20 is in a flow interruption state.

[0030] like Figure 1 As shown, the principle of the conveying pipe opening regulating valve 40 in preventing direct connection between external gas and subsequent pipelines can be found in Chinese Patent Document CN110884915A. Unlike Chinese Patent Document CN110884915A, the conveying pipe opening regulating valve 40 in this application is located on the spiral conveying pipeline 10. The conveying pipe opening regulating valve 40 includes a retaining plate 41 and a second driving member 42 that drives the retaining plate 41 to move within the spiral conveying pipeline 10. The second driving member 42 is a manual gate valve. When the retaining plate 41 moves within the spiral conveying pipeline 10, the gap between the lower edge of the retaining plate 41 and the outer circular surface of the spiral shaft 11 is adjustable.

[0031] like Figure 3As shown, the feed hopper 20 has two parallel discharge ports 21, each connected to a spiral conveyor pipe 10, which can promptly transport the material in the feed hopper 20 through the two outlets. There is an inverted V-shaped gap between the two discharge ports 21. Since the guide plate 31 is rectangular, to prevent excessive leakage of material from the gap between the inverted V-shaped gap and the guide plate 31, a filling block 34 is provided on each side of the inverted V-shaped gap. The filling block 34 is a right-angled trapezoid, and a channel for the guide plate 31 to pass through is provided on one side of the filling block 34 and one side of the discharge port 21.

[0032] like Figure 3 , Figure 4 As shown, the feeding hopper 20 is also provided with a feeding plate 50 in the middle of its top. The feeding plate 50 can reciprocate under the action of the feeding drive 51, thereby guiding the material relatively evenly to the two discharge ports 21. Example 2

[0033] The difference between Example 2 and Example 1 is that both the guide plate 31 and the outer shell 32 are horizontally arranged, the outer shell 32 extends in the vertical direction of the spiral conveying pipeline 10, and the distance between the guide plate 31 and the bottom of the feed hopper 20 is 10-15cm. Since the guide plate 31 is horizontally arranged, there is no need to provide a right-angled trapezoidal filling block 34.

Claims

1. A quantitative feeding mechanism, comprising a screw conveying pipeline (10) with a screw shaft (11) for pushing materials; a feeding bin (20) arranged at one end of the screw conveying pipeline (10) and communicating with the screw conveying pipeline (10) so that materials can enter the screw conveying pipeline (10) through the feeding bin (20); characterized in that further comprising a bin opening adjusting valve (30) arranged at the lower part of the feeding bin (20), comprising a guide plate body (31), a plate body shell (32), and a first driving member (33) for driving the guide plate body (31) to move in the plate body shell (32); the guide plate body (31) can change the area of the feeding bin (20) that is blocked under the driving of the first driving member (33).

2. The dosing mechanism of claim 1, wherein: The guide plate body (31) is arranged obliquely, and when the bottom of the guide plate body (31) is located at the bottom of the feeding bin (20), the passage cross section of the feeding bin (20) is in a flow interruption state.

3. The dosing mechanism of claim 1, wherein: The guide plate body (31) is arranged horizontally, and the distance between the guide plate body (31) and the bottom of the feeding bin (20) is not greater than 20 cm.

4. The dosing mechanism of claim 1, wherein: Further comprising a conveying pipe opening adjusting valve (40) arranged on the screw conveying pipeline (10), comprising a blocking plate body (41) and a second driving member (42) for driving the blocking plate body (41) to move in the screw conveying pipeline (10); when the blocking plate body (41) moves in the screw conveying pipeline (10), the gap between the lower edge of the blocking plate body (41) and the outer surface of the screw shaft (11) is adjustable.

5. The dosing mechanism of claim 1, wherein: The feeding bin (20) has two parallel arranged discharge ports (21), and each discharge port (21) is connected with a set of screw conveying pipeline (10).

6. A dosing mechanism according to claim 5, wherein: The feeding bin (20) is provided with a raking plate body (50) in the middle of the top thereof, and the raking plate body (50) can make reciprocating motion under the action of a raking driving member (51).

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