CN118306729A - Screw conveying equipment for producing barite powder - Google Patents

Abstract

The invention relates to the technical field of conveying of barite powder, and in particular provides screw conveying equipment for producing barite powder, which comprises the following components: main spiral pipeline, middle spiral pipeline, afterbody spiral pipeline and ejection of compact shutoff mechanism. According to the invention, the continuous discharge holes at the end parts of the main spiral pipeline and the middle spiral pipeline are opened, so that the main spiral pipeline, the middle spiral pipeline and the tail spiral pipeline realize integrated conveying and feeding of the counterweight powder, the internal volume of the conveying equipment is enlarged, the discharge amount of the conveying equipment is increased, the conveying efficiency of the counterweight powder is greatly improved, and meanwhile, the internal volume and the discharge amount of the whole spiral conveying equipment are controlled through the cooperation of the two discharge plugging mechanisms and the main spiral pipeline, the middle spiral pipeline and the tail spiral pipeline, so that the use efficiency and the use convenience of the conveying equipment are greatly improved.

Description

Screw conveying equipment for producing barite powder

Technical Field

The invention relates to the technical field of conveying of barite powder, and particularly provides screw conveying equipment for producing barite powder.

Background

The barite powder is colorless or white powder crystal, transparent or semitransparent, high in hardness and glass luster, and is widely applied to the fields of chemical industry, paper industry, coating paint, plastic industry, rubber industry, medicine industry, oilfield development and the like; barite powder is commonly used in the production process in a screw conveyor, which is a common conveying device used for conveying powdery materials in industrial production.

The screw conveyor can control the conveying speed of the powdery material by adjusting the rotating speed of the screw so as to meet the requirement in the production process, but when the conveying speed of the screw conveyor can be adjusted during screw conveying of the barite powder, the discharging amount of the discharging hole and the internal volume of the screw conveyor are fixed, and when the total amount of the barite powder is large, the rapid conveying, discharging and subpackaging of the barite powder are difficult to realize; if a screw conveyer with a larger volume is adopted, the waste of conveying resources is easily caused when the total amount of the barite powder is small. Therefore, there is a need for a screw conveyor for producing barite powder, which can adjust the discharge amount and volume according to the production requirements of the barite powder.

Disclosure of Invention

In view of the above problems, embodiments of the present application provide a screw conveying apparatus for producing barite powder, so as to solve the technical problems in the related art.

In order to achieve the above object, the embodiment of the present application provides the following technical solutions: screw conveying equipment for producing barite powder comprises: the diameters of the three concentric spiral pipelines are sequentially reduced, and the three spiral pipelines are respectively a main spiral pipeline, a middle spiral pipeline and a tail spiral pipeline according to the order from the large diameter to the small diameter.

The feed inlet has been seted up to the one end that middle part helical duct was kept away from at main helical duct lateral wall top, and main helical duct is close to middle part helical duct's one end, and middle part helical duct is close to afterbody helical duct's one end all installs the connecting cylinder that the diameter reduces gradually and be the funnel form, and main helical duct and middle part helical duct tip set up the continuous discharge gate with the connecting cylinder intercommunication, main helical duct, middle part helical duct and afterbody helical duct pass through the connecting cylinder intercommunication in proper order.

The conveying shaft is rotationally connected between the inner walls of the main spiral pipeline and the tail spiral pipeline, three spiral blades which are axially arranged and sequentially positioned in the main spiral pipeline, the middle spiral pipeline and the tail spiral pipeline are fixedly sleeved on the conveying shaft, discharge ports which are respectively communicated with one end bottoms of the main spiral pipeline, the middle spiral pipeline and the tail spiral pipeline, which are far away from the feed inlet, are respectively formed in the bottom of one end of the main spiral pipeline, the bottom of one end of the middle spiral pipeline and the bottom of one end of the tail spiral pipeline, and discharge plugging mechanisms for plugging continuous discharge ports of the main spiral pipeline and the middle spiral pipeline are respectively arranged on the two connecting cylinders.

In one possible implementation, the conveying shaft is composed of three rotating shafts with diameters gradually decreasing along the arrangement direction of the main spiral pipeline, the middle spiral pipeline and the tail spiral pipeline.

In one possible implementation mode, the discharging and plugging mechanism for plugging the continuous discharging hole of the main spiral pipeline comprises a plurality of plugging blades uniformly distributed along the circumferential direction of the main spiral pipeline, the plugging blades are fan-shaped, the middle parts of the arc-shaped side walls of the plugging blades are hinged to the outer wall of the end part of the main spiral pipeline, a plugging driving group is arranged on the inclined surface of the connecting cylinder and used for driving the plugging blades to rotate along the hinging point to the conveying shaft.

The discharging and plugging mechanism for plugging the continuous discharging port of the middle spiral pipeline has the same structure as that of the discharging and plugging mechanism for plugging the continuous discharging port of the main spiral pipeline.

Two plugging supplementary seats which are distributed along the axial direction of the conveying shaft are rotatably arranged on the conveying shaft, the two plugging supplementary seats are respectively positioned at two continuous discharge holes, the end faces of the plugging blades are clung to the corresponding plugging supplementary seats after the plugging blades rotate, the plugging blades form a complete plugging ring face, the plugging ring face and the plugging supplementary seats are matched to plug the continuous discharge holes, and the end faces of the plugging blades, which are far away from the hinge points, face the conveying shaft.

In one possible embodiment, the diameter of the outer annular surface of a complete plugging annular surface formed by a plurality of plugging blades is larger than the diameter of the continuous outlet.

In one possible implementation mode, the plugging driving group comprises a plurality of pushing rods which are connected to the side wall of the connecting cylinder in a sliding manner and are uniformly distributed along the circumferential direction of the pushing rods, a sealing assembly is arranged between the pushing rods and the connecting cylinder, pushing rollers are rotationally connected after the pushing rods penetrate into the connecting cylinder in a sliding manner, the pushing rollers are in one-to-one correspondence with the plugging blades, and one ends, far away from the pushing rollers, of the pushing rods are jointly connected with a sliding pushing ring.

In one possible implementation mode, the sealing assembly comprises a supplementing cylinder which is arranged on the pushing rod in a sliding mode and is fixedly connected to the side wall of the connecting cylinder, a sealing ring is fixedly sleeved on the side wall of the pushing rod, the sealing ring is positioned in the supplementing cylinder, a connecting ring is jointly sleeved between the supplementing cylinders, and the connecting ring is fixedly sleeved on the outer walls of the corresponding middle spiral pipeline and the tail spiral pipeline respectively.

In one possible implementation manner, sealing ring sleeves are fixedly sleeved between the main spiral pipeline and the middle spiral pipeline and between the middle spiral pipeline and the tail spiral pipeline.

In one possible implementation mode, a plugging base plate is sleeved on one end side wall of the pushing rod, which is close to the pushing roller, through rotation of the torsion spring rod, and the plugging base plate is arc-shaped.

In one possible implementation manner, the plugging supplementary seat is in a cone shape with the diameter gradually increasing towards the continuous discharging hole, and the plugging supplementary seat is rotatably sleeved at the end part of the rotating shaft close to the continuous discharging hole.

In one possible implementation manner, the end face of the vertical section of the plugging supplementary seat is fixedly connected with a reinforcing ring sleeve, the reinforcing ring sleeve is rotationally sleeved on the other rotating shaft adjacent to the rotating shaft connected with the plugging supplementary seat, the diameter of the end part of the reinforcing ring sleeve, which is close to the plugging supplementary seat, is larger than that of the other end part, and the arc-shaped end surface of the plugging blade, which is far away from the hinge joint of the plugging blade, is an inclined surface matched with the outer ring surface of the reinforcing ring sleeve.

The above technical solutions in the embodiments of the present invention have at least one of the following beneficial effects:

1. According to the spiral conveying equipment for producing the barite powder, the continuous discharge holes at the end parts of the main spiral pipeline and the middle spiral pipeline are opened, and the main spiral pipeline, the middle spiral pipeline and the tail spiral pipeline realize integrated conveying and feeding of the barite powder, so that the internal volume of the conveying equipment is enlarged, the discharge quantity of the conveying equipment is increased, the conveying efficiency of the barite powder is greatly improved, and meanwhile, the internal volume and the discharge quantity of the whole spiral conveying equipment are controlled through the matching of the two discharge blocking mechanisms with the main spiral pipeline, the middle spiral pipeline and the tail spiral pipeline, so that the discharge quantity and the volume can be adjusted according to production requirements, and the use efficiency and the use convenience of the conveying equipment are greatly improved.

2. When the continuous discharge port is required to be opened, the pushing roller does not push the blocking blade any more, the conveying equipment can be started simultaneously in the process, and the barite powder automatically pushes the blocking blade to rotate to open the continuous discharge port through the pushing force of the spiral blade, so that the continuous discharge port is opened in a time-saving and labor-saving manner, and the conveying efficiency of the barite powder is further improved.

3. The conveying shaft comprises three rotating shafts with diameters gradually reduced along the arrangement direction of the main spiral pipeline, the middle spiral pipeline and the tail spiral pipeline, so that the diameter of the conveying shaft can be matched with the diameter of the corresponding spiral pipeline, the internal volume of the spiral pipeline is reasonably utilized, the conveying efficiency is not influenced due to the fact that the internal volume is too small, and waste is not caused due to the fact that the internal volume is too large.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic overall perspective view of the present invention.

Fig. 2 is a schematic perspective view of the seal ring sleeve of fig. 1 with the seal ring sleeve removed in accordance with the present invention.

Fig. 3 is a schematic view of a partial perspective structure of the present invention.

Fig. 4 is a front cross-sectional view of the present invention.

Fig. 5 is an enlarged view of the invention at a in fig. 4.

Fig. 6 is an enlarged view of the invention at B in fig. 4.

Reference numerals:

1. a main helical pipe; 101. a seal ring sleeve; 2. a middle spiral pipe; 3. a tail helical pipe; 4. a feed inlet; 5. a connecting cylinder; 6. a continuous discharge port; 7. a conveying shaft; 8. a helical blade; 9. a discharging blocking mechanism; 90. plugging the blade; 91. plugging the driving group; 910. pushing the push rod; 911. a pushing roller; 912. sliding the push ring; 92. plugging the supplementing seat; 920. a reinforcing ring sleeve; 930. a replenishing barrel; 931. a seal ring; 932. a connecting ring; 940. plugging backing plates; 10. and a discharge port.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In order that those skilled in the art will better understand the present invention, the following description will be given in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, a screw conveyor for producing barite powder includes: the diameters of the three concentric spiral pipelines are sequentially reduced, and the three spiral pipelines are respectively a main spiral pipeline 1, a middle spiral pipeline 2 and a tail spiral pipeline 3 according to the order from the diameter to the diameter.

Referring to fig. 2, 3 and 5, a feed inlet 4 is formed in one end, far away from the middle spiral pipe 2, of the top of the side wall of the main spiral pipe 1, one end, close to the middle spiral pipe 2, of the main spiral pipe 1 and one end, close to the tail spiral pipe 3, of the middle spiral pipe 2 are provided with connecting cylinders 5, the diameters of the connecting cylinders 5 are gradually reduced, continuous discharge ports 6 communicated with the connecting cylinders 5 are formed in the end portions of the main spiral pipe 1 and the middle spiral pipe 2, and the main spiral pipe 1, the middle spiral pipe 2 and the tail spiral pipe 3 are sequentially communicated through the connecting cylinders 5.

Referring to fig. 3 and 4, a conveying shaft 7 is rotatably connected between the inner walls of the main spiral pipeline 1 and the tail spiral pipeline 3, three spiral blades 8 which are axially arranged and sequentially positioned in the main spiral pipeline 1, the middle spiral pipeline 2 and the tail spiral pipeline 3 are fixedly sleeved on the conveying shaft 7, and the conveying shaft 7 consists of three rotating shafts with diameters gradually reduced along the arrangement directions of the main spiral pipeline 1, the middle spiral pipeline 2 and the tail spiral pipeline 3, so that the diameter of the conveying shaft 7 can be matched with the diameter of the corresponding spiral pipeline.

Referring to fig. 3, the bottoms of one ends of the main spiral pipeline 1, the middle spiral pipeline 2 and the tail spiral pipeline 3, which are far away from the feed inlet 4, are respectively provided with a discharge port 10 communicated with each other, and two connecting cylinders 5 are respectively provided with a discharge plugging mechanism 9 for plugging the continuous discharge ports 6 of the main spiral pipeline 1 and the middle spiral pipeline 2.

When the conveying equipment is used, the number of spiral pipelines can be selected according to the total amount of the barite powder, when the total amount of the barite powder is large, the main spiral pipeline 1 and the continuous discharge port 6 of the middle spiral pipeline 2 are opened, the main spiral pipeline 1, the middle spiral pipeline 2 and the tail spiral pipeline 3 are integrally conveyed and fed, so that after the barite powder enters the main spiral pipeline 1 from the feed port 4, the barite powder rapidly moves to the discharge port 10 and the continuous discharge port 6 through the spiral blades 8, one part of barite powder is discharged from the discharge port 10, the other part of barite powder enters the middle spiral pipeline 2 from the continuous discharge port 6, thereby splitting the barite powder in the main spiral pipeline 1, avoiding the problem that the screw blades 8 are too fast in rotation and conveying, the discharge of the barite powder is not timely, and the blockage is caused, and similarly, after the barite powder enters the middle spiral pipeline 2, the barite powder rapidly moves to the discharge port 10 of the middle spiral pipeline 2 through the spiral blades 8, one part of the barite powder is discharged from the discharge port 10, the other part of the barite powder enters the continuous discharge port 6, and finally enters the spiral pipeline 3, and the efficiency of the barite powder is greatly improved.

When the total amount of the barite powder is less, only the main spiral pipeline 1 or the main spiral pipeline 1 and the middle spiral pipeline 2 are required to be conveyed, the corresponding discharging blocking mechanism 9 is started to block the continuous discharging port 6 of the main spiral pipeline 1 or the continuous discharging port 6 of the middle spiral pipeline 2, so that the use flexibility and convenience of the conveying equipment are improved.

Referring to fig. 2 and 3, the discharging plugging mechanism 9 for plugging the continuous discharging port 6 of the main spiral pipeline 1 comprises a plurality of plugging blades 90 uniformly distributed along the circumferential direction of the main spiral pipeline 1, the plugging blades 90 are fan-shaped, the middle part of the arc-shaped side wall of the plugging blade 90 is hinged on the outer wall of the end part of the main spiral pipeline 1, the inclined surface of the connecting cylinder 5 is provided with a plugging driving group 91, and the plugging driving group 91 is used for driving the plugging blade 90 to rotate along the hinging point towards the conveying shaft 7.

The discharging and plugging mechanism 9 for plugging the continuous discharging port 6 of the middle spiral pipeline 2 has the same structure as the discharging and plugging mechanism 9 for plugging the continuous discharging port 6 of the main spiral pipeline 1.

Referring to fig. 5, the conveying shaft 7 is rotatably provided with two plugging replenishment seats 92 distributed along the axial direction thereof, the two plugging replenishment seats 92 are respectively located at two continuous discharge ports 6, when the end faces of the plugging blades 90 are tightly attached to the corresponding plugging replenishment seats 92, the plugging blades 90 form a complete plugging annulus, the plugging annulus and the plugging replenishment seats 92 cooperate to plug the continuous discharge ports 6, and the end faces of the plugging blades 90 away from the hinge points face the conveying shaft 7.

The diameter of the outer annular surface of a complete plugging annular surface formed by a plurality of plugging blades 90 is larger than the diameter of the continuous discharging port 6, so that the situation that the barite powder is discharged from the hinge joint of the plugging blades 90 after the continuous discharging port 6 is plugged by rotating the plugging blades 90 is avoided.

Referring to fig. 3 and 5, the plugging driving set 91 includes a plurality of pushing rods 910 slidably connected to the side wall of the connecting cylinder 5 and uniformly distributed along the circumferential direction thereof, a sealing assembly is disposed between the pushing rods 910 and the connecting cylinder 5, the pushing rods 910 are rotatably connected with pushing rollers 911 after slidably penetrating into the connecting cylinder 5, the pushing rollers 911 are in one-to-one correspondence with the plugging blades 90, and one ends of the pushing rods 910 away from the pushing rollers 911 are commonly connected with a sliding pushing ring 912.

Referring to fig. 2, two sliding pushing rings 912 are respectively sleeved on the outer walls of the corresponding middle spiral pipeline 2 and the tail spiral pipeline 3, the two sliding pushing rings 912 are connected with external driving sources (such as electric sliders), when the continuous discharge port 6 is required to be plugged, the conveying device is in a stop state, then the corresponding external driving sources are started, the external driving sources drive the sliding pushing rings 912, the pushing rods 910 and the pushing rollers 911 to move, the pushing rollers 911 push the plugging blades 90 to rotate along the hinge points until the plugging blades 90 are tightly attached to the corresponding plugging supplementing seats 92, at this time, a complete plugging ring surface is formed by the plugging blades 90, and the end faces of the plugging blades 90 away from the hinge points face the conveying shaft 7, so that the continuous discharge port 6 is plugged.

When the continuous discharge port 6 needs to be opened, the external driving source drives the sliding pushing ring 912 to move reversely, the pushing roller 911 does not push the plugging blade 90 any more, the conveying equipment can be started simultaneously in the process, after the pushing roller 911 moves away, the barite powder automatically pushes the plugging blade 90 to rotate to open the continuous discharge port 6 through the pushing force of the spiral blade 8, the continuous discharge port 6 is opened, time and labor are saved, and the conveying efficiency of the barite powder is further improved.

Referring to fig. 6, the sealing assembly includes a supplementary cylinder 930 slidably sleeved on the push rod 910 and fixedly connected to the side wall of the connection cylinder 5, a sealing ring 931 fixedly sleeved on the side wall of the push rod 910, the sealing ring 931 located in the supplementary cylinder 930, a plurality of supplementary cylinders 930 sleeved with connection rings 932, the connection rings 932 respectively fixedly sleeved on the corresponding outer walls of the middle spiral pipe 2 and the tail spiral pipe 3, the connection rings 932 providing supporting force for the supplementary cylinder 930, and the sealing ring 931 being matched with the push rod 910 to seal between the push rod 910 and the supplementary cylinder 930 during the movement of the push rod 910, and the supplementary cylinder 930 providing supporting force and movement guiding for the push rod 910.

Referring to fig. 1, sealing rings 101 are fixedly sleeved between the main spiral pipeline 1 and the middle spiral pipeline 2 and between the middle spiral pipeline 2 and the tail spiral pipeline 3, so that the sealing performance of the joint of the three spiral pipelines is further improved.

Referring to fig. 6, a sealing pad 940 is rotatably sleeved on a side wall of one end of the push rod 910, which is close to the push roller 911, through a torsion spring rod, the sealing pad 940 is arc-shaped, when the continuous discharge port 6 is opened, the push rod 910 drives the push roller 911 to move towards the side wall of the connecting cylinder 5, the sealing pad 940 automatically rotates under the resistance action of the inner wall of the connecting cylinder 5 when being close to the inner wall of the connecting cylinder 5 until the push roller 911 is not moved any more, and at this time, the sealing pad 940 is attached to the side wall of the connecting cylinder 5, and further seals the joint of the push rod 910 and the connecting cylinder 5.

Referring to fig. 5, the plugging replenishment seat 92 is in a cone shape with a diameter gradually increasing toward the continuous discharge port 6, and is rotatably sleeved at one end of the rotating shaft near the continuous discharge port 6, so that the resistance of the plugging replenishment seat 92 to the barite powder is reduced.

Referring to fig. 5, the end face of the vertical section of the plugging supplementary seat 92 is fixedly connected with a reinforcing ring sleeve 920, the reinforcing ring sleeve 920 is rotatably sleeved on another rotating shaft adjacent to the rotating shaft connected with the plugging supplementary seat 92, the diameter of the end part of the reinforcing ring sleeve 920, which is close to the plugging supplementary seat 92, is larger than that of the other end part, the arc-shaped end surface of the plugging blade 90, which is far away from the hinge joint of the plugging blade, is an inclined surface matched with the outer annular surface of the reinforcing ring sleeve 920, the reinforcing ring sleeve 920 is used for improving the stability of the connection between two adjacent rotating shafts, and meanwhile, the plugging blade 90 is attached to the outer annular surface of the reinforcing ring sleeve 920 after rotating, so that the plugging effect on the continuous discharge port 6 is further improved, and meanwhile, the rotation of the conveying shaft 7 is not influenced.

During operation, the number of the spiral pipelines can be selected according to the total amount of the barite powder, when the total amount of the barite powder is large, the continuous discharge ports 6 at the end parts of the main spiral pipeline 1 and the middle spiral pipeline 2 are opened, and the main spiral pipeline 1, the middle spiral pipeline 2 and the tail spiral pipeline 3 are integrally conveyed and fed, so that the barite powder in the main spiral pipeline 1 is shunted, the barite powder is quickly conveyed to the discharge ports 10 of the middle spiral pipeline 2 through the spiral blades 8 in the shunt after entering the middle spiral pipeline 2, one part of the barite powder is discharged from the discharge ports 10, the other part of the barite powder enters the tail spiral pipeline 3 from the continuous discharge ports 6, and finally is discharged through the discharge ports 10 of the tail spiral pipeline 3, and the conveying efficiency of the barite powder is greatly improved.

When the total amount of the barite powder is smaller, only the main spiral pipeline 1 or the main spiral pipeline 1 and the middle spiral pipeline 2 are required to be conveyed, the corresponding discharging blocking mechanism 9 is started to block the continuous discharging port 6 of the main spiral pipeline 1 or the continuous discharging port 6 of the middle spiral pipeline 2, so that the flexibility and convenience of using the spiral conveying equipment for producing the barite powder are improved.

In the description of the present invention, it should be understood that the terms "long", "width", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The embodiments of the present invention are all preferred embodiments of the present invention, and are not limited in scope by the present invention, so that all equivalent changes according to the structure, shape and principle of the present invention are covered in the scope of the present invention.

Claims (10)

1. Screw conveyor for production of barite powder, characterized by comprising: the diameters of the three concentric spiral pipelines are sequentially reduced, and the three spiral pipelines are respectively a main spiral pipeline (1), a middle spiral pipeline (2) and a tail spiral pipeline (3) according to the order from the large diameter to the small diameter;

A feed inlet (4) is formed in one end, far away from the middle spiral pipeline (2), of the top of the side wall of the main spiral pipeline (1), one end, close to the middle spiral pipeline (2), of the main spiral pipeline (1) and one end, close to the tail spiral pipeline (3), of the middle spiral pipeline (2) are respectively provided with a connecting cylinder (5) with gradually reduced diameter and in a funnel shape, continuous discharge holes (6) communicated with the connecting cylinders (5) are formed in the ends of the main spiral pipeline (1) and the middle spiral pipeline (2), and the main spiral pipeline (1), the middle spiral pipeline (2) and the tail spiral pipeline (3) are sequentially communicated through the connecting cylinders (5);

The novel spiral feeding device is characterized in that a conveying shaft (7) is rotationally connected between the inner walls of the main spiral pipeline (1) and the tail spiral pipeline (3), three spiral blades (8) which are axially arranged and sequentially located in the main spiral pipeline (1), the middle spiral pipeline (2) and the tail spiral pipeline (3) are fixedly sleeved on the conveying shaft (7), a discharge port (10) which is respectively communicated with one end bottom of the main spiral pipeline (1), one end bottom of the middle spiral pipeline (2) and one end bottom of the tail spiral pipeline (3) which are far away from the feed port (4) are respectively arranged, and discharge plugging mechanisms (9) which are used for plugging continuous discharge ports (6) of the main spiral pipeline (1) and the middle spiral pipeline (2) are respectively arranged on the two connecting cylinders (5).

2. The screw conveyor for producing barite powder according to claim 1, wherein: the discharging blocking mechanism (9) for blocking the continuous discharging hole (6) of the main spiral pipeline (1) comprises a plurality of blocking blades (90) which are uniformly distributed along the circumferential direction of the main spiral pipeline (1), the blocking blades (90) are fan-shaped, the middle part of the arc-shaped side wall of each blocking blade (90) is hinged to the outer wall of the end part of the main spiral pipeline (1), the inclined surface of the connecting cylinder (5) is provided with a blocking driving group (91), and the blocking driving group (91) is used for driving the blocking blades (90) to rotate towards the conveying shaft (7) along a hinging point;

The discharging and plugging mechanism (9) for plugging the continuous discharging port (6) of the middle spiral pipeline (2) has the same structure as the discharging and plugging mechanism (9) for plugging the continuous discharging port (6) of the main spiral pipeline (1);

Two plugging supplementing seats (92) which are distributed along the axial direction of the conveying shaft (7) are rotatably arranged on the conveying shaft, the two plugging supplementing seats (92) are respectively positioned at two continuous discharge holes (6), the end faces of the plugging blades (90) are clung to the corresponding plugging supplementing seats (92) after rotating, the plugging blades (90) form a complete plugging ring face, the continuous discharge holes (6) are plugged by matching the plugging ring face with the plugging supplementing seats (92), and the end faces of the plugging blades (90) far away from the hinge points of the plugging blades face the conveying shaft (7).

3. The screw conveyor for producing barite powder according to claim 2, wherein: the plugging driving group (91) comprises a plurality of pushing rods (910) which are connected to the side wall of the connecting cylinder (5) in a sliding manner and uniformly distributed along the circumferential direction of the pushing rods, a sealing assembly is arranged between each pushing rod (910) and the connecting cylinder (5), pushing rollers (911) are rotationally connected after the pushing rods (910) slide into the connecting cylinder (5), the pushing rollers (911) are in one-to-one correspondence with plugging blades (90), and one ends, far away from the pushing rollers (911), of the pushing rods (910) are jointly connected with a sliding pushing ring (912).

4. A screw conveyor for producing barite powder according to claim 3, wherein: the sealing assembly comprises a supplement cylinder (930) which is sleeved on the push rod (910) in a sliding mode and is fixedly connected to the side wall of the connecting cylinder (5), a sealing ring (931) is fixedly sleeved on the side wall of the push rod (910), the sealing ring (931) is located in the supplement cylinder (930), connecting rings (932) are sleeved among the plurality of supplement cylinders (930) in a sleeved mode, and the connecting rings (932) are fixedly sleeved on the outer walls of the corresponding middle spiral pipeline (2) and the tail spiral pipeline (3) respectively.

5. The screw conveyor for producing barite powder according to claim 1, wherein: the conveying shaft (7) is composed of three rotating shafts with diameters gradually reduced along the arrangement direction of the main spiral pipeline (1), the middle spiral pipeline (2) and the tail spiral pipeline (3).

6. The screw conveyor for producing barite powder according to claim 2, wherein: the plugging supplementing seat (92) is in a cone shape with the diameter gradually increasing towards the continuous discharging hole (6), and the plugging supplementing seat is rotatably sleeved at the end part of the rotating shaft, which is close to the continuous discharging hole (6).

7. The screw conveyor for producing barite powder according to claim 6, wherein: the end face of the vertical section of the plugging supplementing seat (92) is fixedly connected with a reinforcing ring sleeve (920), the reinforcing ring sleeve (920) is rotationally sleeved on the other rotating shaft adjacent to the rotating shaft connected with the plugging supplementing seat (92), the diameter of the end part of the reinforcing ring sleeve (920) close to the plugging supplementing seat (92) is larger than that of the other end part, and the arc-shaped end face of the plugging blade (90) far away from the hinged part is an inclined face matched with the outer annular face of the reinforcing ring sleeve (920).

8. The screw conveyor for producing barite powder according to claim 1, wherein: sealing ring sleeves (101) are fixedly sleeved between the main spiral pipeline (1) and the middle spiral pipeline (2) and between the middle spiral pipeline (2) and the tail spiral pipeline (3).

9. A screw conveyor for producing barite powder according to claim 3, wherein: the side wall of one end of the pushing rod (910) close to the pushing roller (911) is rotatably sleeved with a plugging base plate (940) through a torsion spring rod, and the plugging base plate (940) is arc-shaped.

10. The screw conveyor for producing barite powder according to claim 2, wherein: the diameter of the outer annular surface of a complete plugging annular surface formed by a plurality of plugging blades (90) is larger than the diameter of a continuous discharging hole (6).