Automatic feeding device for polymer dry powder mixing equipment

Abstract

The invention discloses an automatic feeding device for polymer dry powder mixing equipment, which belongs to the technical field of polymer dry powder mixing and feeding equipment, and comprises a positive pressure conveying component, wherein the positive pressure conveying component comprises a powder collecting box, a positive and negative pressure regulating component is fixedly connected to the side wall of the powder collecting box, a positive pressure conveying pipeline is connected between the lower end of the powder collecting box and the positive and negative pressure regulating component, a star-shaped discharger is rotatably connected inside the lower end of the powder collecting box, and a feeding trough is connected to the side wall of the powder collecting box. Compared with the traditional pneumatic conveying device, the device no longer designs the Roots blower at both ends of the feeding pipe, but installs it in the middle of the feeding pipe. When the polymer dry powder needs to be transported over a long distance, the dry powder can first be sucked into the powder collecting box by the suction negative pressure of the Roots blower, and then the dry powder in the powder collecting box is transported to the silo for a second time by the wind positive pressure of the Roots blower. This method of using positive and negative pressure coordination greatly increases the conveying distance of the Roots blower.

Description

Technical Field

[0001] The invention relates to the technical field of polymer dry powder mixing and feeding equipment, in particular to an automatic feeding device for polymer dry powder mixing equipment. Background Art

[0002] Polymer dry powder mixing equipment is an industrial equipment used to evenly mix a variety of dry powder raw materials (such as polymers, fillers, additives, etc.). This equipment is usually used in industries such as plastics, coatings, food, and pharmaceuticals to ensure that different components can be fully mixed during the production process to improve the performance and quality of the final product. In modern production processes, the automatic feeding device of polymer dry powder mixing equipment plays a vital role. Through efficient automation systems, these devices can accurately and continuously transport dry powder raw materials to the mixing equipment to ensure the stable operation of the production line. At present, most polymer mixing equipment uses positive pressure pneumatic conveying devices to convey dry powder. It uses positive pressure airflow to transport dry powder from the feeding device to the target mixing equipment, which not only reduces material loss, but also effectively prevents dust from flying and maintains the cleanliness of the production environment. This combination not only improves production efficiency, but also ensures product consistency and quality.

[0003] A Chinese patent discloses a positive pressure pneumatic conveying system (authorization announcement number CN118239265B), which includes a machine base and also includes: a feeding mechanism, which is located on the machine base, and includes a first motor and a rotary feeder installed on the top outer wall of the machine base, the top outer wall of the rotary feeder is connected to a hopper, a belt is connected between the rotary feeder and the output end of the first motor, and the bottom outer wall of the rotary feeder is connected to an acceleration tube; a feeding mechanism, which is arranged on the acceleration tube, and includes a first connecting tube and a conveying tube respectively connected to both ends of the acceleration tube, one end of the first connecting tube is connected to a first high-pressure fan, and the end of the conveying tube away from the acceleration tube is connected to a first separation device.

[0004] In the above-mentioned patents and most pneumatic conveying devices, the Roots blower is generally installed at one end of the conveying pipe, and the polymer dry powder is blown by the positive wind pressure generated by the Roots blower, or the Roots blower is installed on the silo and the dry powder is sucked into the silo by negative pressure. However, this design of installation at both ends cannot fully utilize the conveying capacity of the Roots blower, resulting in it being able to push the polymer dry powder only within a limited distance. If the distance that the dry powder needs to be conveyed exceeds the effective conveying range of the blower, the polymer dry powder cannot reach the silo smoothly. In addition, when the polymer dry powder is being conveyed upward to the silo, the dry powder in the upward bend of the conveying pipe may fall due to gravity, causing the dry powder to gradually accumulate there, thereby causing the problem of pipeline blockage. For this reason, we propose an automatic feeding device for polymer dry powder mixing equipment. Summary of the invention

[0005] The object of the present invention is to provide an automatic feeding device for polymer dry powder mixing equipment to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An automatic feeding device for polymer dry powder mixing equipment comprises a positive pressure conveying component, the positive pressure conveying component comprises a powder collecting box, a positive and negative pressure regulating component is fixedly connected to the side wall of the powder collecting box, a positive pressure conveying pipeline is connected between the lower end of the powder collecting box and the positive and negative pressure regulating component, a star-shaped discharger is rotatably connected inside the lower end of the powder collecting box, a feeding trough is connected to the side wall of the powder collecting box, a bag dust collector is fixedly connected inside the powder collecting box, a powder discharge mechanism is fixedly connected inside the powder collecting box, and an end of the positive pressure conveying pipeline away from the powder collecting box is connected to a silo;

[0008] The positive and negative pressure regulating component includes a fixed shell fixedly connected to the powder collecting box, two valve shells are fixedly connected inside the fixed shell, and the two valve shells are distributed on the upper and lower sides, valve cores are rotatably connected inside the two valve shells, T-shaped valve holes are drilled inside the two valve cores, pulleys are fixedly connected to the two valve cores, belts are sleeved between the two pulleys, a motor is fixedly connected to the front side wall of the fixed shell, the output end of the motor is fixedly connected to the pulley, a valve pipe is connected between the two valve shells, a Roots blower is connected to the valve pipe, an air inlet pipe is connected to the upper valve shell, and the air inlet pipe is arranged through the fixed shell, and a negative pressure conveying component is fixedly connected to the fixed shell.

[0009] As a further solution of the present invention, the negative pressure conveying assembly includes a negative pressure pipe, and both ends of the negative pressure pipe are respectively connected to the fixed shell and the powder collecting box, the powder collecting box is connected to a suction pipe, the end of the suction pipe away from the powder collecting box is fixedly connected to a hopper, and the lower side of the lower valve shell is connected to an exhaust pipe.

[0010] As a further solution of the present invention, a weight-type material level meter is fixedly connected inside the powder collecting box, and the weight-type material level meter is electrically connected to the motor, and two pressure relief ventilation assemblies are fixedly connected to the rear side wall of the fixed shell, and the two pressure relief ventilation assemblies are respectively located on the rear side of the valve core.

[0011] As a further solution of the present invention, the pressure relief ventilation assembly includes two valve chambers excavated on the valve core, both valve chambers are slidably connected with valve plugs, and a sealing plug that abuts against the valve core is arranged on the rear side of the valve housing.

[0012] As a further solution of the present invention, a connecting rod is fixedly connected between the valve plug and the sealing plug, and a connecting spring is fixedly connected between the valve plug and the valve core.

[0013] As a further solution of the present invention, a fixed block is fixedly connected to the rear inner wall of the fixed shell, two guide grooves are cut on the fixed block, two slide bars are fixedly connected to the sealing plug, and the slide bars are inserted into the fixed block.

[0014] As a further solution of the present invention, a sliding sheet is slidably connected inside the guide groove, and a sliding rod is arranged to penetrate the sliding sheet, and an air guide component is fixedly connected inside the valve housing on the lower side.

[0015] As a further solution of the present invention, the air guide assembly includes an air guide cylinder inserted into the valve core, and the air guide cylinder is connected to the T-shaped valve hole, an elliptical through hole is drilled on the air guide cylinder, and a fixing rod is fixedly connected between the air guide cylinder and the sealing plug.

[0016] As a further solution of the present invention, the rear side wall of the fixed shell is connected to a driving cylinder, an electric telescopic rod is fixedly connected inside the driving cylinder, and the electric telescopic rod is fixedly connected to the fixed block, and a fixed pipe is fixedly connected between the rear side wall of the valve shell and the rear inner wall of the fixed shell.

[0017] As a further solution of the present invention, a branch conduit is connected to the fixed pipe, and the branch conduit is connected to the positive pressure delivery pipeline. A pressure sensor is fixedly connected to the positive pressure delivery pipeline, and the pressure sensor is electrically connected to the electric telescopic rod.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. When the present invention is used, compared with the traditional pneumatic conveying device, the Roots blower is no longer designed at the two ends of the conveying pipe, but is installed in the middle of the conveying pipe. When it is necessary to convey the polymer dry powder over a long distance, the dry powder can be first sucked into the powder collecting box by the suction negative pressure of the Roots blower, and then the dry powder in the powder collecting box is conveyed to the silo for a second time by the positive wind pressure of the Roots blower. This method of using positive and negative pressure to coordinate greatly increases the conveying distance of the Roots blower.

[0020] 2. When the present invention is used, the pressure relief ventilation component can be set so that the air inlet and outlet of the Roots blower are in a ventilation state during the rotation of the valve core, so that there is no need to shut down the Roots blower when the device switches between positive and negative pressure delivery, and at the same time it will not affect the operation of the Roots blower, thereby effectively improving the service life of the Roots blower.

[0021] 3. When the present invention is used, it can cooperate with the setting of the air guide component. When the dry powder inside the positive pressure conveying pipeline is blocked, the airflow generated by the Roots blower can be guided to the upper bend of the positive pressure conveying pipeline through the branch duct. This can ensure that the airflow will not be disturbed by other dry powders, thereby enabling the dry powder to be smoothly conveyed to the inside of the silo. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional stereogram of an automatic feeding device for polymer dry powder mixing equipment;

[0023] Figure 2 It is a structural schematic diagram of the positive and negative pressure regulating components in an automatic feeding device of a polymer dry powder mixing equipment;

[0024] Figure 3 It is a schematic diagram of the structure inside a fixed shell in an automatic feeding device of a polymer dry powder mixing equipment;

[0025] Figure 4 This is a schematic diagram of the structure inside a powder collecting box in an automatic feeding device of a polymer dry powder mixing equipment;

[0026] Figure 5 This is an appearance diagram of a pressure relief venting component in an automatic feeding device of a polymer dry powder mixing equipment;

[0027] Figure 6 It is a structural schematic diagram of an air guide component in an automatic feeding device of a polymer dry powder mixing equipment;

[0028] Figure 7 This is an exploded view of a pressure relief venting component in an automatic feeding device of a polymer dry powder mixing equipment;

[0029] Figure 8 This is a diagram of the airflow trajectory of an automatic feeding device of a polymer dry powder mixing equipment under negative pressure;

[0030] Fig. 9 This is a state diagram of an automatic feeding device of a polymer dry powder mixing equipment when it is clearing a blockage;

[0031] Fig.10 This is a diagram of the airflow trajectory of an automatic feeding device of a polymer dry powder mixing equipment under negative pressure.

[0032] In the figure:

[0033] 1. Positive pressure conveying assembly; 101. Powder collecting box; 102. Positive pressure conveying pipeline; 103. Star-shaped discharger; 104. Feed chute; 105. Bag dust collector; 106. Powder discharge mechanism; 107. Material silo;

[0034] 2. Positive and negative pressure regulating components; 201. Fixed shell; 202. Valve shell; 203. Valve core; 204. T-type valve hole; 205. Pulley; 206. Belt; 207. Motor; 208. Valve pipe; 209. Roots blower; 210. Air inlet pipe;

[0035] 3. Negative pressure conveying assembly; 301. Negative pressure pipe; 302. Extraction pipe; 303. Hopper; 304. Exhaust pipe;

[0036] 4. Heavy hammer type level meter;

[0037] 5. Pressure relief vent assembly; 501. Valve chamber; 502. Valve plug; 503. Sealing plug; 504. Connecting rod; 505. Connecting spring; 506. Fixing block; 507. Guide groove; 508. Sliding rod; 509. Sliding sheet;

[0038] 6. Gas guide assembly; 601. Gas guide cylinder; 602. Elliptical through hole; 603. Fixed rod; 604. Driving cylinder; 605. Electric telescopic rod; 606. Fixed tube; 607. Branch guide tube; 608. Pressure sensor. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example 1: Please refer to Figures 1 to 5 and Fig.10In an embodiment of the present invention, an automatic feeding device for polymer dry powder mixing equipment includes a positive pressure conveying component 1, the positive pressure conveying component 1 includes a powder collecting box 101, a positive and negative pressure regulating component 2 is fixedly connected to the side wall of the powder collecting box 101, a positive pressure conveying pipeline 102 is connected between the lower end of the powder collecting box 101 and the positive and negative pressure regulating component 2, and a star-shaped discharger 103 is rotatably connected to the lower end of the powder collecting box 101, and the star-shaped discharger 103 is driven by a motor. When the star-shaped discharger 103 rotates, the dry powder inside the powder collecting box 101 can be discharged, and at the same time, the star-shaped discharger 103 can make the positive pressure conveying pipeline 102 and the inside of the powder collecting box 101 not in a connected state, so as to avoid the polymer dry powder inside the powder collecting box 101 being blown away due to gas communication, and the side wall of the powder collecting box 101 is connected with a feeding trough 104, and the feeding trough 1 A sealing cover is hinged on the upper end of 04. When the material is not being unloaded, the sealing cover can prevent the polymer dry powder from escaping. A bag dust collector 105 is fixedly connected to the inside of the powder collecting box 101. The multiple bags of the bag dust collector 105 can effectively filter the polymer dry powder. A powder discharge mechanism 106 for cleaning the bags of the bag dust collector 105 is fixedly connected to the inside of the powder collecting box 101. The high-pressure gas generated by the powder discharge mechanism 106 can be blown to the bags of the bag dust collector 105, which can effectively clean the powder and ensure that the bags of the bag dust collector 105 can continuously filter the polymer dry powder, thereby realizing the separation of the gas and the polymer dry powder. The bag dust collector 105 and the powder discharge mechanism 106 are both existing technologies and are not described here in detail. The end of the positive pressure conveying pipeline 102 away from the powder collecting box 101 is connected to the silo 107.

[0041] See also Figure 6 to Figure 7 The positive and negative pressure regulating assembly 2 includes a fixed shell 201 fixedly connected to the powder collecting box 101, and two valve shells 202 are fixedly connected inside the fixed shell 201, and the two valve shells 202 are distributed on the upper and lower sides. The lower valve shell 202 is connected to the positive pressure delivery pipeline 102, and the insides of the two valve shells 202 are rotatably connected with valve cores 203. T-shaped valve holes 204 are drilled inside the two valve cores 203. The directions of the T-shaped valve holes 204 drilled in the valve cores 203 inside the valve shells 202 on the upper and lower sides are different. The directions of the drilled T-shaped valve holes 204 can be referred to Figure 3 As shown, a vent hole connected to the middle of the T-shaped valve hole 204 is bored on the rear side wall of the valve core 203, and the vent hole is sealed by the abutment of the sealing plug 503 in the initial state. Pulleys 205 are fixedly connected to the two valve cores 203, and a belt 206 is sleeved between the two pulleys 205. A motor 207 is fixedly connected to the front side wall of the fixed shell 201, and the output end of the motor 207 is fixedly connected to the pulley 205. A valve pipe 208 is connected between the two valve shells 202, and a Roots blower 209 is connected to the valve pipe 208. An air inlet pipe 210 is connected to the upper valve shell 202, and the air inlet pipe 210 is arranged to penetrate the fixed shell 201, and a negative pressure delivery component 3 is fixedly connected to the fixed shell 201.

[0042] When carrying out short-distance polymer dry powder transportation, the staff can put the polymer dry powder into the powder collecting box 101 through the feed trough 104, and then start the star-shaped discharger 103 and the Roots blower 209. The star-shaped discharger 103 discharges the polymer dry powder in the powder collecting box 101 into the positive pressure conveying pipeline 102, and the Roots blower 209 draws in the outside air through the air inlet pipe 210, so that the airflow passes through the T-shaped valve hole 204 in the two valve cores 203, and is finally introduced into the positive pressure conveying pipeline 102, and the polymer dry powder is blown into the silo 107 to realize the transportation of the polymer dry powder. This process is as follows: Fig.10 shown.

[0043] See also Figure 8The negative pressure conveying component 3 includes a negative pressure pipe 301, and the two ends of the negative pressure pipe 301 are respectively connected to the fixed shell 201 and the powder collecting box 101, the powder collecting box 101 is connected with a pumping pipe 302, and the end of the pumping pipe 302 away from the powder collecting box 101 is fixedly connected to a hopper 303, and the lower side of the lower valve shell 202 is connected with an exhaust pipe 304, the inside of the powder collecting box 101 is fixedly connected with a weight-type material level meter 4, and the weight-type material level meter 4 is electrically connected to the motor 207, and the rear side wall of the fixed shell 201 is fixedly connected with two pressure relief ventilation components 5, and the two pressure relief ventilation components 5 are respectively The pump 302 is located at the rear side of the valve core 203. When the polymer dry powder needs to be transported over a long distance, the transport distance is extended through the extraction pipe 302. When in use, the polymer dry powder needs to be put into the hopper 303 first, and then the motor 207 is started, so that the motor 207 drives the two valve cores 203 to rotate 90 degrees through the cooperation of the two pulleys 205 and the belt 206, so that the valve core 203 in the upper valve housing 202 is connected to the negative pressure pipe 301 through the T-shaped valve hole 204, and the valve core 203 in the lower valve housing 202 is connected to the exhaust air pipe 301 through the T-shaped valve hole 204. The tube 304 is connected. Thus, when the Roots blower 209 is started, negative pressure can be generated inside the powder collecting box 101 through the negative pressure tube 301, so that the polymer dry powder in the hopper 303 is sucked into the powder collecting box 101 through the extraction tube 302, and the gas and the polymer dry powder are separated by the bag filter 105. Finally, the polymer dry powder will stay in the powder collecting box 101, and the separated gas will pass through the negative pressure tube 301 and the T-shaped valve hole 204 of the valve core 203 in the two valve shells 202, and finally be discharged from the exhaust pipe 304. In this process, the weight hammer type material The level meter 4 can detect the height of the polymer dry powder at regular intervals. When the microprocessor calculates that the detected height reaches the preset height, the motor 207 and the star-shaped discharger 103 are started through the controller, so that the motor 207 drives the valve core 203 to rotate and reset again, and the star-shaped discharger 103 discharges the polymer dry powder inside the powder collecting box 101 into the positive pressure conveying pipe 102. Subsequently, the polymer dry powder is conveyed to the silo 107 in the same manner as the above-mentioned positive pressure conveying principle. This method utilizes the negative pressure of the Roots blower 209 to extend the material conveying distance.

[0044] It is worth noting that although the negative pressure exhaust effect of Roots blower 209 is lower than that of the existing Roots vacuum pump, their structures and principles are not much different. At the same time, Roots blower 209 can also be used to exhaust negative pressure, and there are a large number of cases in actual application.

[0045] See also Figure 6 to Figure 7The pressure relief ventilation component 5 includes two valve chambers 501 drilled on the valve core 203, and valve plugs 502 are slidably connected inside the two valve chambers 501. A sealing plug 503 that abuts against the valve core 203 is arranged on the rear side of the valve housing 202. A connecting rod 504 is fixedly connected between the valve plug 502 and the sealing plug 503, and a connecting spring 505 is fixedly connected between the valve plug 502 and the valve core 203. A fixed block 506 is fixedly connected to the rear inner wall of the fixed housing 201. Two guide grooves 507 are drilled on the fixed block 506. The shape of the guide groove 507 is an arc with the center of the fixed block 506 as the outer arc, and a groove with a depth of an arc is formed inside. Two sliding rods 508 are fixedly connected to the sealing plug 503, and the sliding rods 508 are inserted into the interior of the fixed block 506. A sliding sheet 509 is slidably connected inside the guide groove 507, and the sliding rod 508 penetrates the sliding sheet 509. The lower side of the valve housing 202 is fixedly connected to It is connected to an air guide component 6. When the controller starts the motor 207 and the star-shaped discharger 103, the Roots blower 209 is still in the starting state. When the motor 207 drives the valve core 203 to rotate, the valve core 203 drives the sealing plug 503 to rotate through the connecting rod 504, so that the sliding rod 508 can move along the inner wall of the deep arc-shaped groove inside the guide groove 507. In this process, the sealing plug 503 will gradually separate from the valve core 203. A vent is opened on the side wall of the fixed shell 201, and the vent is not shown in the figure. This vent can allow the outside air to enter the Roots blower 209 through the T-shaped valve hole 204 of the valve core 203 in the upper valve shell 202, and then pass through the valve core 203 in the lower valve shell 202, and finally be discharged to the silo through the fixed pipe 606 and the branch pipe 607, so as to avoid the air outlet and air inlet of the Roots blower 209 being in a closed state, which affects the normal operation of the Roots blower 209.

[0046] Example 2: Please refer to Figure 6 and Fig. 9Based on Example 1, the air guide component 6 includes an air guide cylinder 601 inserted into the valve core 203, and the air guide cylinder 601 is connected to the T-shaped valve hole 204. An elliptical through hole 602 is drilled on the air guide cylinder 601. A through hole connected to the T-shaped valve hole 204 is drilled on the air guide cylinder 601. When positive pressure delivery is performed, the elliptical through hole 602 on the air guide cylinder 601 is connected to the Roots blower 209. When the air guide cylinder 601 moves, the elliptical through hole 602 is still connected to the Roots blower 209, while the other through holes on the air guide cylinder 601 are in a closed state due to the movement of the air guide cylinder 601. The air guide cylinder 601 and the Roots blower 209 are connected. A fixing rod 603 is fixedly connected between the sealing plugs 503, a driving cylinder 604 is connected to the rear side wall of the fixed shell 201, an electric telescopic rod 605 is fixedly connected inside the driving cylinder 604, and the electric telescopic rod 605 is fixedly connected to the fixing block 506, a fixing pipe 606 is fixedly connected between the rear side wall of the valve shell 202 and the rear inner wall of the fixed shell 201, a branch conduit 607 is connected to the fixed pipe 606, and the branch conduit 607 is connected to the upward turning point of the positive pressure delivery pipeline 102, a pressure sensor 608 is fixedly connected to the positive pressure delivery pipeline 102, and the pressure sensor 608 is electrically connected to the electric telescopic rod 605.

[0047] When the polymer dry powder falls and accumulates at the upper bend of the positive pressure conveying pipeline 102 and becomes blocked, the positive pressure inside the positive pressure conveying pipeline 102 will gradually increase. This process will be measured by the pressure sensor 608 and processed by the microprocessor. When the pressure is greater than the preset value, the microprocessor will start the electric telescopic rod 605, and the electric telescopic rod 605 will pull the fixed block 506 to move, so that the fixed block 506 pulls the sliding rod 508 to move through the sliding sheet 509, and then pulls the elliptical through hole 602 to move through the sealing plug 503, so that the elliptical through hole 602 can block the T-type valve hole 204. At this time, the airflow generated by the Roots blower 209 flows to the fixed pipe 606 through the elliptical through hole 602, and then flows from the fixed pipe 606 to the branch pipe 607, and finally blows directly to the upper bend of the positive pressure conveying pipeline 102, helping the polymer dry powder to be transported to the silo 107.

[0048] The working principle of the present invention is:

[0049] When the present invention is used for short-distance transportation, the worker puts the polymer dry powder into the powder collecting box 101, and then starts the star-shaped discharger 103 and the Roots blower 209. The star-shaped discharger 103 discharges the polymer dry powder in the powder collecting box 101 into the positive pressure conveying pipeline 102, and the Roots blower 209 introduces external air, so that the air passes through the air inlet pipe 210, and then passes through the T-shaped valve holes 204 in the two valve cores 203, and finally is introduced into the positive pressure conveying pipeline 102, so that the air blows the polymer dry powder into the positive pressure conveying pipeline 102. The polymer dry powder is discharged from the powder collecting box 101 to realize the transportation of the polymer dry powder, and then the star-shaped discharger 103 and the Roots blower 209 are started. The star-shaped discharger 103 discharges the polymer dry powder in the powder collecting box 101 into the positive pressure conveying pipeline 102, and the Roots blower 209 draws in the outside air through the air inlet pipe 210, so that the airflow passes through the T-shaped valve holes 204 in the two valve cores 203, and is finally introduced into the positive pressure conveying pipeline 102, and the polymer dry powder is blown into the silo 107, so as to realize the transportation of the polymer dry powder;

[0050] When long-distance transportation is required, the polymer dry powder is first put into the hopper 303, and then the motor 207 is started, so that the motor 207 drives the two valve cores 203 to rotate 90 degrees through the cooperation of the two pulleys 205 and the belt 206. When the Roots blower 209 is started, a negative pressure can be generated inside the powder collecting box 101 through the negative pressure pipe 301, and then the polymer dry powder in the hopper 303 is sucked into the powder collecting box 101 through the extraction pipe 302, and then the gas and the polymer dry powder are separated by the bag dust collector 105. Finally, the polymer dry powder will stay in the powder collecting box 101. This process is as follows Figure 8 As shown in this process, the weight-type material level meter 4 can detect the height of the polymer dry powder at regular intervals. When the microprocessor calculates that the detected height reaches the preset height, the motor 207 drives the valve core 203 to rotate and reset again, and the star-shaped discharger 103 discharges the polymer dry powder in the powder collecting box 101 into the positive pressure conveying pipeline 102. The subsequent process is the same as the above-mentioned short-distance positive pressure conveying principle, and the polymer dry powder is conveyed to the silo 107. This method utilizes the negative pressure of the Roots blower 209 to extend the conveying distance of the material.

[0051] In addition, the function of the pressure relief venting assembly 5 is that when the motor 207 drives the valve core 203 to rotate, the valve core 203 drives the sealing plug 503 to rotate through the connecting rod 504, so that the sliding rod 508 can move along the inner wall of the deep arc-shaped groove inside the guide groove 507, so that the sealing plug 503 is gradually separated from the valve core 203, and the outside air enters the Roots blower 209 through the T-shaped valve hole 204 of the valve core 203 in the upper valve shell 202, and then passes through the valve core 203 in the lower valve shell 202, and finally is discharged to the silo through the fixed pipe 606 and the branch conduit 607, so as to avoid the air outlet and air inlet of the Roots blower 209 being in a closed state, which affects the normal operation of the Roots blower 209;

[0052] When the polymer dry powder falls and accumulates at the upper bend of the positive pressure delivery pipeline 102 and becomes blocked, the positive pressure inside the positive pressure delivery pipeline 102 will gradually increase. This process will be detected by the pressure sensor 608, causing the microprocessor to start the electric telescopic rod 605. The electric telescopic rod 605 pulls the fixed block 506 to move, so that the fixed block 506 pulls the sliding rod 508 to move through the sliding sheet 509, and then pulls the elliptical through hole 602 to move through the sealing plug 503, so that the elliptical through hole 602 can block the T-shaped valve hole 204. At this time, the airflow generated by the Roots blower 209 flows to the fixed pipe 606 through the elliptical through hole 602, and then flows from the fixed pipe 606 to the branch pipe 607, and finally blows directly to the upper bend of the positive pressure delivery pipeline 102. This process is as shown in FIG. Fig. 9 As shown, it helps to transport the polymer dry powder into the silo 107.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic feeding device for polymer dry powder mixing equipment, comprising a positive pressure conveying component (1), characterized in that: The positive pressure conveying component (1) comprises a powder collecting box (101), a positive and negative pressure regulating component (2) is fixedly connected to the side wall of the powder collecting box (101), a positive pressure conveying pipeline (102) is connected between the lower end of the powder collecting box (101) and the positive and negative pressure regulating component (2), a star-shaped discharger (103) is rotatably connected inside the lower end of the powder collecting box (101), a feeding trough (104) is connected to the side wall of the powder collecting box (101), a bag dust collector (105) is fixedly connected inside the powder collecting box (101), a powder discharge mechanism (106) is fixedly connected inside the powder collecting box (101), and an end of the positive pressure conveying pipeline (102) away from the powder collecting box (101) is connected to a silo (107); The positive and negative pressure regulating assembly (2) comprises a fixed shell (201) fixedly connected to the powder collecting box (101), two valve shells (202) are fixedly connected inside the fixed shell (201), and the two valve shells (202) are distributed on the upper and lower sides, the two valve shells (202) are rotatably connected to the inside of the two valve shells (202), the two valve shells (203) are drilled inside with T-shaped valve holes (204), the two valve shells (203) are fixedly connected to pulleys (205), and a belt is sleeved between the two pulleys (205). The fixed shell (201) is fixedly connected to a motor (207) on the front side wall, the output end of the motor (207) is fixedly connected to the pulley (205), a valve pipe (208) is connected between the two valve shells (202), a Roots blower (209) is connected to the valve pipe (208), the upper valve shell (202) is connected to an air inlet pipe (210), and the air inlet pipe (210) runs through the fixed shell (201), and the fixed shell (201) is fixedly connected to a negative pressure delivery assembly (3).

2. The automatic feeding device for polymer dry powder mixing equipment according to claim 1, characterized in that: The negative pressure conveying assembly (3) comprises a negative pressure pipe (301), and the two ends of the negative pressure pipe (301) are respectively connected to the fixed shell (201) and the powder collecting box (101); the powder collecting box (101) is connected to a material extraction pipe (302); one end of the material extraction pipe (302) away from the powder collecting box (101) is fixedly connected to a hopper (303); and the lower side of the valve shell (202) is connected to an exhaust pipe (304).

3. The automatic feeding device for polymer dry powder mixing equipment according to claim 1, characterized in that: A weight-type material level meter (4) is fixedly connected inside the powder collecting box (101), and the weight-type material level meter (4) is electrically connected to the motor (207). Two pressure relief venting assemblies (5) are fixedly connected to the rear side wall of the fixed shell (201), and the two pressure relief venting assemblies (5) are respectively located on the rear side of the valve core (203).

4. The automatic feeding device for polymer dry powder mixing equipment according to claim 3, characterized in that: The pressure relief vent assembly (5) comprises two valve chambers (501) bored on the valve core (203), the two valve chambers (501) are both slidably connected with valve plugs (502), and a sealing plug (503) abutting against the valve core (203) is provided on the rear side of the valve housing (202).

5. The automatic feeding device for polymer dry powder mixing equipment according to claim 4, characterized in that: A connecting rod (504) is fixedly connected between the valve plug (502) and the sealing plug (503), and a connecting spring (505) is fixedly connected between the valve plug (502) and the valve core (203).

6. The automatic feeding device for polymer dry powder mixing equipment according to claim 5, characterized in that: A fixing block (506) is fixedly connected to the rear inner wall of the fixing shell (201), two guide grooves (507) are cut on the fixing block (506), and two sliding rods (508) are fixedly connected to the sealing plug (503), and the sliding rods (508) are inserted into the fixing block (506).

7. The automatic feeding device for polymer dry powder mixing equipment according to claim 6, characterized in that: A sliding sheet (509) is slidably connected inside the guide groove (507), and a sliding rod (508) is arranged to penetrate the sliding sheet (509). An air guide component (6) is fixedly connected inside the valve housing (202) at the lower side.

8. The automatic feeding device for polymer dry powder mixing equipment according to claim 7, characterized in that: The air guide assembly (6) comprises an air guide cylinder (601) inserted into the interior of the valve core (203), and the air guide cylinder (601) is in communication with the T-shaped valve hole (204). An elliptical through hole (602) is formed on the air guide cylinder (601), and a fixing rod (603) is fixedly connected between the air guide cylinder (601) and the sealing plug (503).

9. The automatic feeding device for polymer dry powder mixing equipment according to claim 8, characterized in that: The rear side wall of the fixed shell (201) is connected to a driving cylinder (604), an electric telescopic rod (605) is fixedly connected inside the driving cylinder (604), and the electric telescopic rod (605) is fixedly connected to a fixing block (506), and a fixing pipe (606) is fixedly connected between the rear side wall of the valve shell (202) and the rear inner wall of the fixed shell (201).

10. The automatic feeding device for polymer dry powder mixing equipment according to claim 9, characterized in that: The fixed pipe (606) is connected to a branch pipe (607), and the branch pipe (607) is connected to the positive pressure delivery pipe (102). The positive pressure delivery pipe (102) is fixedly connected to a pressure sensor (608), and the pressure sensor (608) is electrically connected to the electric telescopic rod (605).

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