Outer spraying device for circular mold, granulator, adjusting method, control system and control method

Abstract

The invention belongs to the technical field of ring die granulators. The circular mold outer spraying device comprises a confluence body, a first confluence channel, a second confluence channel and an outlet channel are arranged on the confluence body, and the first confluence channel is used for being connected with an oil way; the second confluence channel is connected with a gas circuit; the nozzle is arranged in an outlet channel of the confluence body; and the connecting and adjusting assembly is arranged on the confluence body and used for arranging the outer spraying device for the ring mold on a granulator, and the distance between the nozzle and the ring mold is adjusted through the connecting and adjusting assembly for the ring mold with different outer circle diameters, so that the spraying area of the nozzle covers the discharging area of the ring mold. The invention is used for solving the technical problems of particle material scratching, oil hanging, agglomeration and poor atomization effect in the prior art. The invention further relates to a granulator which comprises the external spraying device for the circular mold. The invention also relates to an adjusting method of the granulator. The invention also relates to a control system and a control method of the external spraying device for the circular mould.

Description

Technical Field

[0001] The present invention belongs to the technical field of ring die pelletizers, and specifically relates to a ring die external spraying device. The present invention also relates to a pelletizer, comprising the above-mentioned ring die external spraying device. The present invention also relates to a method for adjusting the above-mentioned pelletizer. The present invention further relates to a control system of the ring die external spraying device and a control method thereof. Background Art

[0002] Oil is added as a nutritional cost in the formula. However, in the actual pelleting process, if the amount of oil added is too large, although it is conducive to the material being squeezed out of the ring die, it will affect the quality of the pellets, such as substandard hardness, insufficient pellet firmness, and easy generation of dust. Therefore, in order to ensure that the quality of the pellets is not affected by the addition of oil, in the existing feed processing technology, a set of spraying equipment and auxiliary conveying equipment is usually added downstream of the pelletizer to spray the surface of the pellets after molding. The increase in equipment also leads to an increase in investment in plant and fixed assets, and the number of cleaning and maintenance points increases accordingly.

[0003] In response to the above situation, many feed factories in the industry have begun to try to add grease spraying devices outside the pellet mill ring die, exploring the simpler structure of the ring die spraying technology. From the actual effect, due to the extensive structure and simple control, effective, uniform and quantitative addition has not been achieved, the product quality is uneven, and the problems of pellets being lumpy, oily, clumping and poor atomization are prominent.

[0004] The Chinese utility model patent specification with announcement number CN202760129U discloses a pelletizer with a synchronous spraying device. The feed pelletizer is provided with a feed inlet on the body and a discharge outlet under the body. A ring die is installed outside the pressure roller connected to the power equipment. It is characterized in that two mist oil spray nozzles are installed in front of the cutter inside the pelletizer. The mist oil spray nozzles are connected to the oil pump with a heat-resistant high-pressure pipe. The oil pump is connected to the oil storage tank through a filter. A heating device is provided in the oil storage tank. The invention of the pellet feed grease synchronous spraying pelletizer is a breakthrough in the feed industry production, which improves the product quality comprehensively and can be widely used in feed processing enterprises. The main advantages of the above patent are mainly reflected in the spraying outside the ring die of the pelletizer, and the spray oil tank and the oil storage tank are specially treated to realize the spraying function. However, it does not achieve effective, uniform and quantitative addition, and the product quality is uneven. Problems such as granular flower material, oil hanging, agglomeration, and poor atomization effect are prominent.

[0005] Spraying outside the ring die has its irreplaceable advantages: for example, by spraying the surface of the material just out of the die, the spraying equipment in the traditional feed processing technology can be eliminated, effectively reducing the investment in plant and equipment. At the same time, with the reduction of processing links, the labor intensity of workers (daily equipment cleaning, etc.) is reduced. In addition, the device can be directly installed on the door of the pellet mill, so it is also easy to modify the old equipment.

[0006] However, during the application process, this solution also has many shortcomings and problems to be solved, such as: ① Uneven spraying, grainy particles and different colors. ② Poor atomization effect, oil on the particle surface and agglomeration. ③ Low degree of automation, the amount of addition cannot be adjusted in real time according to the operating status of the equipment, resulting in oil waste and equipment pollution. Summary of the invention

[0007] The first object of the present invention is to provide a ring die external spraying device to solve the technical problems of the prior art resulting in particle flowery material, oil hanging, clumping and poor atomization effect.

[0008] In order to solve the above technical problems, the present invention adopts the following technical scheme, the ring die outer spraying device is characterized in that it includes: A confluence body, wherein a first confluence channel, a second confluence channel, and an outlet channel are provided on the confluence body, wherein the first confluence channel is used to connect an oil circuit; and the second confluence channel is used to connect an air circuit; A nozzle, disposed at the outlet channel of the confluence body; A connection adjustment component is arranged on the flow confluence body, and is used to arrange the outer spraying device of the ring die on the pelletizer. The connection adjustment component is used to adjust the distance between the nozzle and the ring die for ring dies with different outer diameters, so that the spraying area of ​​the nozzle covers the discharge area of ​​the ring die.

[0009] The converging body of the present invention is in a "Y" shape, compressed air and oil are mixed in the converging body, and released from the nozzle along with the high-pressure gas. The oil is atomized at the moment of pressure release and sprayed toward the granular feed in the preset area.

[0010] In order to solve the technical problem that the outer diameters of the die holes of different ring dies are different, resulting in the spraying area not completely covering the ring die opening area, the present invention adopts the following technical solution, the connection adjustment component includes: An adjustment plate is sleeved on the converging body; first adjustment holes are arranged on both sides of the adjustment plate; The adjusting screw is correspondingly arranged in the first adjusting hole of the adjusting plate, and the adjusting nuts are respectively arranged on the adjusting screws on both sides of the adjusting plate. The distance from the nozzle orifice to the outer surface of the ring die can be adjusted steplessly by connecting the adjusting assembly to ensure that the spraying area just covers the opening area of ​​the ring die.

[0011] In order to solve the technical problem of confluence fluid sealing, the present invention adopts the following technical solution, the ring die outer spraying device also includes a sealing component for circumferential sealing of the ring die outer spraying device; the sealing component includes: A sealing cover plate, wherein a connecting hole and a second adjusting hole are arranged on the sealing cover plate, wherein the connecting hole is used to connect the sealing cover plate with the door body of the granulator; the outlet channel of the converging body is sleeved on the sealing cover plate; the adjusting screw is correspondingly arranged in the second adjusting hole and fixed by a fastening nut; The sealing member is sleeved on the outlet channel of the fluid collector. The sealing member is limited by the mounting seat and axially compressed by the sealing gland to ensure that the sealing member is correctly pressed and installed to form a circumferential seal for the fluid collector of the spray device.

[0012] In order to solve the technical problem of how to arrange the nozzle and the ring die, the present invention adopts the following technical solution: the fluid channel of the nozzle is arranged along the radial direction of the ring die and faces the outer cylindrical surface of the ring die.

[0013] In order to solve the technical problem of small spraying area of ​​circular nozzle, the present invention adopts the following technical solution: the nozzle of the nozzle is in the shape of a straight line, and the straight line nozzle is arranged parallel to the axis of the ring die to increase the spraying area.

[0014] In order to solve the technical problem of high requirements for the installation of the concentrator, the present invention adopts the following technical solution: the first adjustment holes are symmetrically arranged on both sides of the adjustment plate, the first adjustment holes are long arc holes, and the central angle of the long arc holes is 30-60°, so that the concentrator can be installed at any angle of 360°; The second adjustment holes are symmetrically arranged on the sealing gland, and the second adjustment holes are threaded holes, which are convenient for fixing the adjustment screw on the sealing gland.

[0015] The second object of the present invention is to provide a pelletizer, comprising a door body, wherein the door body is provided with the ring die outer spraying device described in any one of the above items.

[0016] In order to solve the technical problem of how to install the ring die outer spraying device on the pelletizer, the present invention adopts the following technical solution: a mounting hole is provided on the door body, a mounting seat is provided on the mounting hole, and the mounting seat is connected to the sealing cover plate of the ring die outer spraying device; The outlet channel of the fluid concentrator sequentially passes through the central hole of the sealing cover plate and the central hole of the mounting seat and mounts the nozzle.

[0017] In order to solve the technical problems of the installation position and quantity of the ring die outer spraying device in the pelletizer, the present invention adopts the following technical scheme, wherein the pelletizer further includes a pressing roller and a cutting knife mechanism; The installation position of the ring die outer spraying device is located at the feeding side of the cutter mechanism and the discharging side where the pressure roller contacts the ring die; The number of the ring die outer spraying devices is less than or equal to the number of the pressure rollers.

[0018] The third object of the present invention is to provide a method for adjusting a pelletizer, which is used to adjust the distance between a ring die with different outer diameters and the nozzle of a spraying device outside the ring die, and to make the nozzle move away from or close to the ring die by adjusting a screw and an adjusting nut, so that the spraying area of ​​the nozzle covers the discharge area of ​​the ring die with different outer diameters.

[0019] In order to solve the above technical problems, the present invention adopts the following technical solutions, and the adjustment method is specifically as follows: The fan-shaped angle of the nozzle under constant pressure P is set to ɑ, ɑ is fixed; the width of the opening area of ​​the ring die is B, B is fixed; the distance d between the outer cylindrical surface of the ring die and the nozzle opening of the nozzle is fixed; d is fixed; When the outer diameter of the ring die increases, loosen the adjusting nut, move the adjusting screw backward, and drive the nozzle to move backward relative to the door of the granulator, so that the distance between the outer surface of the ring die with an increased outer diameter and the nozzle opening is kept at d, and tighten the adjusting nut; When the outer diameter of the ring die becomes smaller, loosen the adjusting nut, move the adjusting screw forward, and drive the nozzle forward relative to the granulator door body, so that the distance between the outer surface of the ring die with a smaller outer diameter and the nozzle opening remains d, and tighten the adjusting nut.

[0020] A fourth object of the present invention is to provide a control system for a ring die outer spraying device, characterized in that it comprises: An oil circuit is connected to the first confluence channel of the ring die outer spraying device; the oil circuit includes an oil pump, a pressure switch, a proportional valve, a flow meter, and a check valve connected in sequence; the oil pump is connected to the oil storage device; the outlet of the oil pump is connected to the oil storage device via a relief valve; The gas circuit is connected to the second converging channel of the ring die outer spraying device; the gas circuit includes a compressed air bag, a solenoid valve, and a check valve connected in sequence; the solenoid valve is used to control the on-off of the gas source; the check valve is used to prevent oil and gas from flowing back; PLC controls the pressure switch, proportional valve and flow meter solenoid valve respectively.

[0021] The fifth object of the present invention is to provide a control method for a ring die outer spraying device, which is characterized in that the control system is used to achieve the above; The oil pump provides power for the liquid oil; when the pressure in the oil circuit at the oil pump outlet reaches the set pressure of the set pressure switch, the oil circuit opens, and the liquid oil enters the confluence body through the pressure switch, proportional valve, flow meter, and check valve; when the oil pump outlet pressure is higher than the overflow value, the liquid oil will overflow back to the oil storage device; The compressed air is sent to the confluence fluid through the pipeline; the compressed air and liquid oil are mixed in the confluence fluid and released from the nozzle of the nozzle along with the high-pressure gas. The oil is atomized at the moment of pressure release and sprayed toward the granular feed in the preset area.

[0022] In order to solve the technical problems of how to control the addition amount and how to ensure the uniformity of the addition, the present invention adopts the following technical solution, and the control method also includes: According to the pellet mill load current data and upstream equipment feeding frequency data, the PLC obtains the pellet mill real-time capacity data; When the amount of oil added is set to A% of the pellet mill's capacity, the PLC calculates the amount of oil added based on the pellet mill's real-time capacity data, and then converts the opening of the proportional valve; the PLC sends instructions to complete the adjustment of the proportional valve's opening and complete the precise addition of oil and gas; at the same time, the PLC receives the flow meter data in real time, completes the calibration of the proportional valve's opening and the flow meter's flow corresponding value, and dynamically fine-tunes.

[0023] To solve the technical problem of abnormal opening of the bypass door of the granulator, the present invention adopts the following technical solution, and the control method also includes: When the PLC opens the bypass door of the pellet mill, the PLC synchronously adjusts the opening of the proportional valve in the oil circuit to 0 and stops adding grease; at the same time, the PLC controls the solenoid valve in the gas circuit to remain in the open state.

[0024] To solve the technical problem of equipment material shortage, the present invention adopts the following technical solution, and the control method also includes: When the pellet mill is nearing the end of its operation, the feed amount gradually decreases until it runs out of material; the PLC obtains the pellet mill current data I and controls the opening of the proportional valve. Specifically, the amount of grease added will gradually decrease as the pellet mill current decreases until the pellet mill approaches the no-load current, and the opening of the proportional valve is adjusted to 0; When the proportional valve is completely closed, the solenoid valve in the PLC-controlled gas circuit will delay running for a further time T1; The PLC closes the solenoid valve on the gas line. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the ring die outer spraying device of the present invention Figure 1 ; Figure 2 yes Figure 1 Enlarged view of the middle nozzle; Figure 3 Schematic diagram of the ring die outer spraying device of the present invention Figure 2 ; Figure 4 This is an exploded view of the ring die outer spraying device of the present invention; Figure 5 It is a structural schematic diagram of a granulator of the present invention; Figure 6 yes Figure 5 A magnified view of middle; Figure 7 It is a schematic diagram of the spraying area of ​​the nozzle and the ring die of the present invention; Figure 8 is a schematic diagram of a control system of the present invention; In the figure: 10. Granulator; 100 ring die external spraying device; 110 confluence body; 111 first confluence channel; 112 second confluence channel; 113 outlet channel; 114 compressed air quick plug connector; 120 nozzle; 121 nozzle; 130 connection adjustment assembly; 131 adjustment plate; 1311 first adjustment hole; 1312 center hole; 132 adjustment screw; 133 adjustment nut; 134 fastening nut; 140 sealing assembly, 200 ring die; 200' small ring die; 200' large ring die; 300 cutting mechanism; 400 pressure rollers; 500 suppression zone; 600 door body; 610 mounting base; 700 pellets of feed; 800 control system of the external spraying device of the ring die; 810 oil circuit; 811 oil storage device; 812 oil pump; 813 pressure switch; 814 proportional valve; 815 flow meter; 816 check valve; 817 relief valve; 820 air circuit; 821 compressed air bag; 822 solenoid valve; 823 check valve; 830 controller. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Example 1 like Figure 1-4 As shown, the ring mold outer spraying device 100 includes a converging body 110, a nozzle 120, and a connection adjustment component 130: The two confluence channels of the confluence body are connected to the oil circuit and the gas circuit respectively. Specifically, the confluence body 110 is provided with a first confluence channel 111, a second confluence channel 112, and an outlet channel 113. Among them, the first confluence channel 111 is used to connect the oil circuit. The second confluence channel 112 is used to connect the gas circuit. Preferably, a compressed air quick-connect connector 114 is installed on the second confluence channel 112.

[0028] The nozzle 120 is installed on the outlet channel 113 of the confluence body 110. In one embodiment, Figure 5As shown, the fluid channel of the nozzle 120 is arranged along the radial direction of the ring die and faces the outer circumferential surface of the ring die.

[0029] In one embodiment, Figure 2 As shown, the nozzle 121 of the nozzle 120 is in the shape of a straight line, and the straight line nozzle is arranged parallel to the axis of the ring die. The nozzle nozzle is in the shape of a straight line, and is parallel to the axis of the ring die. The nozzle is a precision-machined part, and is connected to the confluence body by a thread. Specifically, the nozzle and the confluence body are tightly screwed and sealed by the thread.

[0030] The connection adjustment component 130 is used to set the ring die outer spraying device on the pelletizer. In addition, the connection adjustment component 130 is used to adjust the distance between the nozzle and the ring die for ring dies with different outer diameters so that the spraying area of ​​the nozzle covers the discharge area of ​​the ring die.

[0031] In one embodiment, in order to ensure that the "I"-shaped nozzle of the nozzle is parallel to the axis of the ring die after the screw connection, the spraying device is provided with a connection adjustment component, which can realize the installation of the confluence body at any angle of 360°. The connection adjustment component 130 is installed on the confluence body 110. Figure 4 As shown, the connection adjustment assembly 130 includes an adjustment plate 131, an adjustment screw 132, and an adjustment nut 133. A center hole 1312 is machined on the adjustment plate 131. First adjustment holes 1311 are arranged on both sides of the adjustment plate 131. The first adjustment holes 1311 are located on both sides of the center hole 1312.

[0032] In one embodiment, the first adjustment holes 1311 are symmetrically arranged on both sides of the adjustment plate 131. The first adjustment holes 1311 are long arc holes, and the center angle of the long arc holes is 30-60°. The long arc holes with an angle of not less than 30° are arranged on the adjustment plate, and when the position of the fixed threaded hole is selected, 30° self-rotation fine adjustment can be satisfied.

[0033] The adjustment plate 131 is sleeved on the confluence body 110 ; the adjustment screws 132 are correspondingly arranged in the first adjustment holes 1311 of the adjustment plate, and the adjustment nuts 133 are respectively arranged on the adjustment screws 132 on both sides of the adjustment plate 131 .

[0034] In one embodiment, the ring die outer spraying device further includes a sealing assembly 140 for circumferential sealing of the ring die outer spraying device. Figure 4 As shown, the sealing assembly includes a sealing cover plate 141 and a sealing member 142 .

[0035] The sealing cover plate 141 is processed with a connecting hole 1411 and a second adjustment hole 1412, wherein the connecting hole 1411 is used to connect the sealing cover plate with the granulator door body. The second adjustment hole 1412 is used to install the adjustment screw 132. In one embodiment, the second adjustment hole 1412 is symmetrically arranged on the sealing gland 141. Preferably, the second adjustment hole 1412 is a threaded hole. The seal 142 is sleeved on the outlet channel 113 of the fluid converging body 110, and the seal 142 is axially compressed by the sealing gland 141. The seal 142 is preferably a sealing gasket.

[0036] Specifically, six threaded holes are evenly distributed on the sealing cover plate 141, and two different sets of threaded holes can be selected for installation to achieve installation at any angle of 360°. In addition, the remaining four threaded holes are used to fasten the sealing cover plate to ensure that the seal 142 is correctly pressed and installed to form a circumferential seal for the spray device confluence body.

[0037] Specifically, the outlet channel 113 of the flow concentrator 110 is sleeved on the sealing cover plate 121 ; the adjusting screw 132 is correspondingly arranged in the second adjusting hole 1412 and fixed by a fastening nut 134 .

[0038] In order to ensure that the "I"-shaped nozzle is parallel to the axis of the ring die and reduce the processing and manufacturing requirements, a connection adjustment component is provided on the manifold, which can realize the installation of the manifold at any angle of 360° to meet functional requirements.

[0039] Usually, feed mills prepare ring dies of different specifications (compression ratios) to produce feeds with different formulas, which means that the outer diameters of the die holes of different ring dies are different. To ensure that the spraying area just covers the ring die opening area, the above-mentioned connection adjustment component can realize stepless adjustment of the distance from the nozzle outlet to the outer surface of the ring die.

[0040] The converging fluid is in a "Y" shape. Compressed air and oil are mixed in the converging fluid and released from the nozzle along with the high-pressure gas. The oil is atomized at the moment of pressure release and sprayed toward the granular feed in the preset area.

[0041] Example 2 like Figure 5 As shown, the pelletizer 10 includes a door body 600, on which the ring die outer spraying device 100 of any one of the embodiments 1 is arranged.

[0042] In one embodiment, a mounting hole is provided on the door body 600. A mounting seat 610 is provided on the mounting hole. The mounting seat 610 is connected to the sealing cover plate 141 of the ring die external spraying device. The outlet channel 113 of the fluid converging body 110 passes through the center hole of the sealing cover plate 141 and the center hole of the mounting seat 601 in sequence and the nozzle 120 is installed. The ring die external spraying device is installed on the granulator door body, and the nozzle fluid channel is arranged along the radial direction of the ring die, facing the outer cylindrical surface of the ring die.

[0043] In one embodiment, the granulator further comprises a pressing roller 400 and a cutting mechanism 300; The installation position of the ring die outer spraying device 100 is located at the feeding side of the cutter mechanism 300 and the discharging side where the pressure roller 400 contacts the ring die 200. During operation, the granulator ring die rotates clockwise, so the spraying area is located behind the contact surface of the pressure roller and the ring die and in front of the cutter (clockwise).

[0044] In one embodiment, the number of the ring die spraying devices 100 is less than or equal to the number of the rollers 400. Specifically, the number of spraying devices is usually no more than the number of rollers of the pelletizer. The mainstream model on the market is a two-roller ring die pelletizer, preferably with two nozzles.

[0045] Example 3 The pelletizer adjustment method is used to adjust the distance between the ring dies with different outer diameters and the nozzle of the nozzle of the ring die outer spraying device, and the nozzle is moved away from or close to the ring die by using an adjusting screw and an adjusting nut, and the spraying area of ​​the nozzle covers the discharge area of ​​the ring dies with different outer diameters.

[0046] Specifically, Figure 7 As shown, the granulator adjustment method is: The central angle of the fan-shaped area blown by the nozzle under constant pressure P is set to ɑ, which is fixed; the opening area of ​​the ring die, that is, the effective width of the ring die is B, which is fixed; the distance d between the outer cylindrical surface of the ring die and the nozzle orifice is fixed; When the outer diameter of the ring die becomes larger, i.e. the large ring die 200', loosen the adjusting nut 133, adjust the screw 132 to move backward, drive the nozzle 120 to move backward relative to the granulator door 600, so that the distance between the outer surface of the large ring die 200' and the nozzle 121 of the nozzle 120 is maintained at d, and tighten the adjusting nut 133; When the outer diameter of the ring die becomes smaller, i.e. the small ring die 200', loosen the adjusting nut 133, move the adjusting screw 132 forward, and drive the nozzle 120 forward relative to the granulator door body, so that the distance between the outer surface of the small ring die 200' and the nozzle 121 of the nozzle 120 remains d, and tighten the adjusting nut.

[0047] The nozzle contained in the spraying device has the characteristic of a fixed fan angle ɑ under constant pressure, while the width of the opening area of ​​the pelletizer ring die is fixed. Therefore, when using it, the distance between the nozzle and the outer circle of the ring die needs to be adjusted to the required value to meet the uniform and effective spraying of the material in the discharge area of ​​the ring die. At the same time, considering the different outer diameters of ring dies of different specifications, in order to ensure that the above spacing can be achieved on different ring dies, the spraying device is fixed on two long screws, and through the paired use of group nuts, the purpose of tightening at the preset position is achieved, thereby realizing the stepless adjustment of the distance from the nozzle to the outer surface of the ring die, meeting the spraying requirements of different outer diameters of ring dies.

[0048] Example 4 like Figure 8 As shown, the control system 800 of the ring die outer spraying device includes an oil circuit 810, an air circuit 820 and a controller 830.

[0049] The oil circuit 810 includes an oil pump 812, a pressure switch 813, a proportional valve 814, a flow meter 815, and a check valve 816 connected in sequence. The oil inlet of the oil pump 812 is connected to the oil storage device 811 via a pipeline. The outlet of the oil pump 812 is divided into two paths, one of which is connected to the oil storage device 811 via a relief valve 817; and the other is connected to the pressure switch 813. The check valve 816 is connected to the first confluence channel 111 of the confluence fluid 110 of the ring die outer spraying device 100.

[0050] The oil pump on the oil pipeline provides power for the liquid oil. When the pressure in the oil circuit at the outlet of the oil pump reaches the set pressure of the set pressure switch, the passage is opened, and the liquid oil enters the spraying device through the pressure switch, proportional valve, flow meter, and check valve. To ensure the stability and safety of the system pressure, an overflow valve is set at the outlet of the oil pump. When the pressure is higher than the overflow value, the liquid oil will overflow back to the oil storage tank.

[0051] The present invention ensures the oil pressure of the liquid entering the confluence fluid by arranging an oil pump, a pressure switch, a check valve and an overflow return oil pipeline on the oil pipeline. Under the condition of stable pressure, the nozzle can realize uniform spraying in a preset area.

[0052] The gas circuit 820 includes a compressed air bag 821, a solenoid valve 822, and a check valve 823 connected in sequence. The solenoid valve 822 is used to control the on-off of the gas source. The check valve 823 is used to prevent the backflow of oil and gas. The check valve 823 is connected to the second confluence channel 112 of the confluence fluid 110 of the ring mold outer spraying device 100. On the gas circuit, the compressed air is sent to the confluence fluid through the pipeline and mixed with the liquid oil. The pipeline is provided with a solenoid valve to control the on-off of the gas source, and a check valve to prevent the backflow of oil and gas. In the gas circuit of the present invention, the on-off of the compressed air can be effectively controlled by the solenoid valve, and finally the uniform addition of oil and gas is achieved.

[0053] The controller 830 is preferably a PLC. The PLC controls the pressure switch 813, the proportional valve 814, the flow meter 815, and the solenoid valve 822 respectively. The proportional valve is set on the oil pipeline to finely adjust the amount of liquid oil added. The flow meter is set at the rear end to cooperate with the proportional valve at the front end to achieve accurate addition of oil. At the same time, the valves set on the line are connected to the PLC, and the PLC performs accurate addition and control.

[0054] Example 5 The control method of the ring die outer spraying device is implemented using the control system of Example 4, specifically as follows: The oil pump provides power for the liquid oil; when the pressure in the oil circuit at the oil pump outlet reaches the set pressure of the set pressure switch, the oil circuit opens, and the liquid oil enters the confluence body through the pressure switch, proportional valve, flow meter, and check valve; when the oil pump outlet pressure is higher than the overflow value, the liquid oil will overflow back to the oil storage device; The compressed air is sent to the confluence fluid through the pipeline; the compressed air and liquid oil are mixed in the confluence fluid and released from the nozzle of the nozzle along with the high-pressure gas. The oil is atomized at the moment of pressure release and sprayed toward the granular feed 700 in the preset area.

[0055] In one embodiment, when the equipment is in normal production, the amount of oil and gas added is adaptive. Specifically, the control method includes: According to the pellet mill load current data and upstream equipment feeding frequency data, the PLC obtains the pellet mill real-time capacity data; When the amount of oil added is manually set to A% of the pellet mill's capacity, for example 5% of the capacity, the PLC reads the pellet mill's real-time capacity data in real time, calculates the amount of oil added, and then converts the opening of the proportional valve; the PLC sends instructions to complete the adjustment of the proportional valve's opening and complete the precise addition of oil and gas; at the same time, the PLC receives the flow meter data in real time, completes the calibration of the proportional valve's opening and the flow meter's flow corresponding value, and dynamically fine-tunes.

[0056] When the pelletizer is working normally, the PLC reads the key operating data of the equipment, such as the equipment load current, the feeding frequency of the upstream equipment, etc., and completes the real-time capacity estimation of the equipment based on the historical test data. The external spraying device of the ring die completes the mathematical relationship between the proportional valve opening and the mass flow rate through the proportional valve and flow meter.

[0057] In one embodiment, when an abnormality occurs in the equipment, the grease is automatically shut down. Specifically, the control method includes: When the PLC opens the pellet mill bypass, the PLC synchronously adjusts the proportional valve opening in the oil circuit to 0 and stops adding grease; at the same time, the PLC controls the solenoid valve in the gas circuit to remain in the open state.

[0058] When the pellet mill is working, it is inevitable that the bypass door will be opened due to material abnormality. At this time, the pellet mill feeding will be interrupted and no particles will be discharged from the die hole. Therefore, when the PLC opens the pellet mill bypass, the opening of the medium proportional valve in the grease adding system will be adjusted to 0 synchronously to stop the grease addition. Generally speaking, the bypass door will not be opened for too long. In order to ensure that the remaining grease in the pipeline is cleaned up and prevent uneven spraying of subsequent materials, the compressed air solenoid valve will be kept open.

[0059] In one embodiment, when the equipment is out of material, the amount of oil and gas added is dynamically shut down. Specifically, the control method includes: When the pellet mill is nearing the end of its operation, the feed amount gradually decreases until it runs out of material; the PLC obtains the pellet mill current data I, matches the amount of grease added based on historical experience data, and controls the opening of the proportional valve. Specifically, the amount of grease added will gradually decrease as the pellet mill current decreases until the pellet mill approaches the no-load current, and the opening of the proportional valve is adjusted to 0; When the proportional valve is completely closed, the solenoid valve in the PLC-controlled gas circuit will delay running for a further time T1; The PLC gives a command to close the solenoid valve on the gas line. At this point, the entire spraying system has completed shutdown and the cleaning of pipeline residues after shutdown.

[0060] The above-mentioned implementation modes are only for illustrating the technical features and concepts of the present invention, and their purpose is to enable technicians familiar with this technology in the field to understand the contents of the present invention and implement them. They cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and implementation modes of the present invention should be included in the protection scope of the present invention.

Claims

1. Ring die external spraying device, characterized in that: include: A confluence body, wherein a first confluence channel, a second confluence channel, and an outlet channel are provided on the confluence body, wherein the first confluence channel is used to connect an oil circuit; and the second confluence channel is used to connect an air circuit; A nozzle, disposed at the outlet channel of the confluence body; A connection adjustment component is arranged on the flow confluence body, and is used to arrange the outer spraying device of the ring die on the pelletizer. The connection adjustment component is used to adjust the distance between the nozzle and the ring die for ring dies with different outer diameters, so that the spraying area of ​​the nozzle covers the discharge area of ​​the ring die.

2. The ring die outer spraying device according to claim 1 is characterized in that: The connection adjustment component comprises: An adjustment plate is sleeved on the converging body; first adjustment holes are arranged on both sides of the adjustment plate; The adjusting screw is correspondingly arranged in the first adjusting hole of the adjusting plate, and the adjusting nuts are respectively arranged on the adjusting screws on both sides of the adjusting plate.

3. The ring die outer spraying device according to claim 2 is characterized in that: The ring die outer spraying device also includes a sealing assembly for circumferential sealing of the ring die outer spraying device; the sealing assembly includes: A sealing cover plate, wherein a connecting hole and a second adjusting hole are arranged on the sealing cover plate, wherein the connecting hole is used to connect the sealing cover plate with the door body of the granulator; the outlet channel of the converging body is sleeved on the sealing cover plate; the adjusting screw is correspondingly arranged in the second adjusting hole and fixed by a fastening nut; A sealing member is sleeved on the outlet channel of the fluid concentrator, and the sealing member is axially compressed by the sealing gland.

4. The ring die outer spraying device according to claim 1, 2 or 3, characterized in that: The fluid channel of the nozzle is arranged along the radial direction of the ring die and faces the outer circumferential surface of the ring die.

5. The ring die outer spraying device according to claim 4 is characterized in that: The nozzle opening is in the shape of a straight line, and the straight line opening is arranged parallel to the axis of the ring die.

6. The ring die outer spraying device according to claim 3 is characterized in that: The first adjustment holes are symmetrically arranged on both sides of the adjustment plate, and the first adjustment holes are long arc holes, and the central angle of the long arc holes is 30-60°; The second adjustment holes are symmetrically arranged on the sealing gland, and the second adjustment holes are threaded holes.

7. A granulator, including a door, characterized in that: The door body is provided with the ring mold outer spraying device described in any one of claims 1-6.

8. The granulator according to claim 7, characterized in that: The door body is provided with a mounting hole, the mounting hole is provided with a mounting seat, and the mounting seat is connected to the sealing cover plate of the ring die outer spraying device; The outlet channel of the fluid concentrator sequentially passes through the central hole of the sealing cover plate and the central hole of the mounting seat and mounts the nozzle.

9. The granulator according to claim 7, characterized in that: The granulator also includes a pressing roller and a cutting knife mechanism; The installation position of the ring die outer spraying device is located at the feeding side of the cutter mechanism and the discharging side where the pressure roller contacts the ring die; The number of the ring die outer spraying devices is less than or equal to the number of the pressure rollers.

10. The method for adjusting the granulator according to any one of claims 7 to 9, characterized in that: The adjustment method is used to adjust the distance between the ring dies with different outer diameters and the nozzle of the nozzle of the ring die outer spraying device, and the nozzle is moved away from or close to the ring die by using an adjusting screw and an adjusting nut, and the spraying area of ​​the nozzle covers the discharge area of ​​the ring dies with different outer diameters.

11. The adjustment method according to claim 10, characterized in that: The adjustment method is specifically as follows: The central angle of the fan-shaped area sprayed by the nozzle under constant pressure P is set to ɑ, ɑ is fixed; the opening area of ​​the ring die, that is, the effective width of the ring die is B, B is fixed; the distance d between the outer cylindrical surface of the ring die and the nozzle opening of the nozzle is fixed; d is fixed; When the outer diameter of the ring die increases, loosen the adjusting nut, move the adjusting screw backward, and drive the nozzle to move backward relative to the door of the granulator, so that the distance between the outer surface of the ring die with an increased outer diameter and the nozzle opening is kept at d, and tighten the adjusting nut; When the outer diameter of the ring die becomes smaller, loosen the adjusting nut, move the adjusting screw forward, and drive the nozzle forward relative to the granulator door body, so that the distance between the outer surface of the ring die with a smaller outer diameter and the nozzle opening remains d, and tighten the adjusting nut.

12. The control system of the ring die outer spraying device according to any one of claims 1 to 6, characterized in that: include: An oil circuit is connected to the first confluence channel of the ring die outer spraying device; the oil circuit includes an oil pump, a pressure switch, a proportional valve, a flow meter, and a check valve connected in sequence; the oil pump is connected to the oil storage device; the outlet of the oil pump is connected to the oil storage device via a relief valve; The gas circuit is connected to the second converging channel of the ring die outer spraying device; the gas circuit includes a compressed air bag, a solenoid valve, and a check valve connected in sequence; the solenoid valve is used to control the on-off of the gas source; the check valve is used to prevent oil and gas from flowing back; PLC controls the pressure switch, proportional valve and flow meter solenoid valve respectively.

13. The control method of the ring die outer spraying device according to claim 12, characterized in that: This is achieved by using the control system described in claim 12; The oil pump provides power for the liquid oil; when the pressure in the oil circuit at the oil pump outlet reaches the set pressure of the set pressure switch, the oil circuit opens, and the liquid oil enters the confluence body through the pressure switch, proportional valve, flow meter, and check valve; when the oil pump outlet pressure is higher than the overflow value, the liquid oil will overflow back to the oil storage device; Compressed air is sent to the sink through the pipeline; The compressed air and liquid oil are mixed in the confluence fluid and released from the nozzle of the nozzle along with the high-pressure gas. The oil is atomized at the moment of pressure release and sprayed toward the granular feed in the preset area.

14. The control method of the ring die outer spraying device according to claim 13, characterized in that: The control method further comprises: According to the pellet mill load current data and upstream equipment feeding frequency data, the PLC obtains the pellet mill real-time capacity data; When the amount of oil added is set to A% of the pellet mill's capacity, the PLC calculates the amount of oil added based on the pellet mill's real-time capacity data, and then converts the opening of the proportional valve; the PLC sends instructions to complete the adjustment of the proportional valve's opening and complete the precise addition of oil and gas; at the same time, the PLC receives the flow meter data in real time, completes the calibration of the proportional valve's opening and the flow meter's flow corresponding value, and dynamically fine-tunes.

15. The control method according to claim 13, characterized in that: The control method further comprises: When the PLC opens the pellet mill bypass, the PLC synchronously adjusts the proportional valve opening in the oil circuit to 0 and stops adding grease; at the same time, the PLC controls the solenoid valve in the gas circuit to remain in the open state.

16. The control method according to claim 13, characterized in that: The control method further comprises: When the pellet mill is nearing the end of its operation, the feed amount gradually decreases until it runs out of material; the PLC obtains the pellet mill current data I and controls the opening of the proportional valve. Specifically, the amount of grease added will gradually decrease as the pellet mill current decreases until the pellet mill approaches the no-load current, and the opening of the proportional valve is adjusted to 0; When the proportional valve is completely closed, the solenoid valve in the PLC-controlled gas circuit will delay running for a further time T1; The PLC closes the solenoid valve on the gas line.

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