Automatic cleaning structure of lime grinder screen

Abstract

The utility model discloses a kind of automatic cleaning structure of lime machine screen, including raw material bin, plate type pusher, feed inlet, water inlet, bucket body, primary rotary screen, secondary rotary screen, fan-shaped spray head a, fan-shaped spray head b, pipeline pump, pressure transmitter and first pneumatic valve, second pneumatic valve and the like component;Bucket body is supported by support rolling ring A and support rolling ring B, driving gear ring drives its rotation, primary rotary screen and secondary rotary screen outside are equipped with airtight cover and observation hole, observation hole area is equipped with fan-shaped spray head a, fan-shaped spray head b;Pipeline pump, pressure transmitter and first pneumatic valve, second pneumatic valve constitute cleaning waterway and control system, can automatically control flushing water pressure, first pneumatic valve and second pneumatic valve can regularly switch flushing pipeline and set flushing time.The structure can flush screen adherend in time, prevent blockage, improve filtration efficiency and continuity, guarantee production safety, satisfy lime milk production demand.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to an automatic cleaning structure for a screen of a ash smelting machine. Background Technology

[0002] In the lime-ammonia combined process for producing magnesium hydroxide from magnesium chloride in salt lake water, the decomposition of ammonium chloride and lime slurry to produce ammonia is the core step. The lime slurry machine is a key piece of equipment used for material digestion and filtration during lime slurry preparation. Solid-liquid separation efficiency directly affects the precision of production process control and the quality of lime slurry. Existing lime slurry machine screen designs have significant flaws, making it difficult to meet the demands of high-efficiency production. Furthermore, the lime slurry screen inside the lime slurry machine is mainly used to separate fine sand from the lime slurry. As the concentration of the lime slurry increases, its viscosity also increases accordingly. The screen surface and sieve holes easily adhere to the slurry, leading to incomplete lime slurry separation, screen clogging, waste of raw quicklime, and a reduction in the amount of lime slurry produced. The existing screen structure lacks a cleaning function, failing to effectively solve these problems and thus failing to meet actual production needs. Utility Model Content

[0003] The present invention aims to solve the problems mentioned in the background art above, and provides an automatic cleaning structure for the screen of a quicklime slurry machine, so as to solve the problems caused by the lack of a cleaning function for the screen of the quicklime slurry machine, such as screen blockage, poor ash slurry separation effect, waste of quicklime and low ash slurry production.

[0004] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: an automatic cleaning structure for a screen of a slag smelting machine, comprising a raw material silo and a barrel body, wherein the discharge end of the raw material silo is correspondingly arranged with the inlet end of a plate pusher; a feed inlet and a water inlet are provided below the discharge end of the plate pusher; the discharge end of the feed inlet is movably connected to the inlet end of the barrel body of the slag smelting machine; the feed inlet is fixedly arranged and does not rotate with the barrel body; a support roller ring A and a support roller ring B are sleeved on the outer circumferential surface of the barrel body, and a drive gear ring is sleeved on the outer circumferential surface of the barrel body between the support roller ring A and the support roller ring B, and the drive gear ring is connected to the output end of a motor for transmission. The discharge end of the barrel is connected to a primary rotating screen and a secondary rotating screen in sequence along the material flow direction; both the primary and secondary rotating screens are covered with independent sealed covers; a rectangular observation hole is opened on the side of the sealed cover; a set of multi-point flushing pipes is fixedly installed inside the sealed cover corresponding to the observation hole, and the flushing ends of the multi-point flushing pipes are respectively equipped with fan-shaped nozzles a and b; a slurry chute is set below the discharge end of the secondary rotating screen, and the discharge end of the slurry chute is connected to the inlet of the storage tank. It also includes a pipeline pump, a pressure transmitter, a first pneumatic valve, and a second pneumatic valve; the pipeline pump is connected to the pressure transmitter via a pipeline; the outlet of the pressure transmitter is connected to the inlet of the first and second pneumatic valves via pipelines respectively; the outlet of the first pneumatic valve is connected to the multi-point flushing pipe of the corresponding primary rotating screen via a pipeline, and the outlet of the second pneumatic valve is connected to the multi-point flushing pipe of the corresponding secondary rotating screen via a pipeline.

[0005] Furthermore, the primary rotating screen rotates simultaneously with the barrel; the outer side of the secondary rotating screen is equipped with an independent drive device; the output end of the independent drive device is connected to the secondary rotating screen via transmission.

[0006] Furthermore, the top of the sealed cover of the primary rotating screen is provided with a primary rotating screen exhaust chimney; the lower end of the primary rotating screen exhaust chimney is connected to the inside of the sealed cover; the top of the sealed cover of the secondary rotating screen is provided with a secondary rotating screen exhaust chimney; the lower end of the secondary rotating screen exhaust chimney is connected to the inside of the sealed cover.

[0007] Furthermore, the cross-section of the molten lime chute is square; an opening is provided at the top of the molten lime chute; a cover plate is movably closed at the opening; and the cover plate is detachably connected to the top edge of the molten lime chute.

[0008] Furthermore, the first pneumatic valve and the second pneumatic valve are electrically connected to the controller.

[0009] Compared with the prior art, this utility model has the following advantages: This invention addresses the lack of cleaning functionality in existing lime slurry machines by coordinating the operation of a raw material silo, a plate feeder, a feed inlet, a drum, a rotary screen, a rinsing assembly, and a liquid storage assembly. A rinsing control structure comprised of a pipeline pump, a pressure transmitter, and a pneumatic valve, along with nozzles covering the screen, effectively rinses away lime slurry adhering to the screen, preventing screen blockage and ensuring filtration efficiency. This solves the problems of incomplete lime slurry separation and raw material waste. The fixed feed inlet and drum are connected movably, with stable support from a supporting roller, ensuring smooth material transport and drum digestion, reducing production interruptions, and improving equipment stability. The connection design between the secondary rotary screen, the lime slurry chute, and the liquid storage tank ensures orderly collection of qualified lime slurry, preventing loss and increasing production yield. The linkage between the pressure transmitter and the pipeline pump stabilizes the rinsing pressure, and the pneumatic valve switches the rinsing pipeline, ensuring continuous rinsing. This effectively improves upon the shortcomings of existing structures, enhancing production efficiency and safety. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure within the observation hole area of ​​this utility model; Figure 3This is a schematic diagram of the start / stop circuit of the controller of this utility model.

[0011] Legend: 1-Raw material bin, 2-Plate pusher, 3-Feed inlet, 4-Water inlet, 5-Support roller A, 6-Drive gear ring, 7-Barrel body, 8-Support roller B, 9-Primary rotary screen exhaust chimney, 10-Secondary rotary screen exhaust chimney, 11-Primary rotary screen, 12-Secondary rotary screen, 13-Lime slurry chute, 14-Storage tank, 15-Fan-shaped nozzle a, 16-First pneumatic valve, 17-Secondary pneumatic valve, 18-Fan-shaped nozzle b, 19-Pressure transmitter, 20-Pipeline pump. Detailed Implementation

[0012] The following will refer to the appendix in the embodiments of this utility model. Figure 1-2 The technical solutions in the embodiments of this utility model are clearly and completely described as follows: An automatic cleaning structure for a screen of a slag smelting machine includes a vertically placed raw material silo 1. The discharge end of the raw material silo 1 is correspondingly set with the feed end of the plate pusher 2. The plate pusher 2 is provided with a feed inlet 3 and a water inlet 4 below it. The discharge end of the feed inlet 3 is movably connected to the feed end of the barrel 7 of the slag smelting machine. The feed inlet 3 is fixed and does not rotate with the barrel 7. The outer circumference of the barrel 7 of the ash-making machine is fitted with a support roller ring A5 and a support roller ring B8. A drive gear ring 6 is fitted between the support roller ring A5 and the support roller ring B8 on the outer circumference of the barrel 7. The drive gear ring 6 is driven by an explosion-proof variable frequency motor. The rotation speed of the drive gear ring 6 can be adjusted by the variable frequency motor, thereby changing the rotation speed of the barrel 7 to adapt to the digestion requirements of different materials. The discharge end of the barrel 7 is connected to a primary rotating screen 11 and a secondary rotating screen 12 in sequence along the material flow direction. The primary rotating screen 11 rotates simultaneously with the barrel 7. The secondary rotating screen 12 is equipped with an independent drive device, and the rotation speed of the secondary rotating screen 12 can be adjusted separately.

[0013] Both the primary rotary screen 11 and the secondary rotary screen 12 are equipped with independent sealed covers. The upper part of the sealed cover is equipped with a fixed exhaust chimney 9 for the primary rotary screen and an exhaust chimney 10 for the secondary rotary screen, respectively, for discharging the gas generated during the production process. Rectangular observation holes are left on the sides of the sealed covers. A set of multi-point flushing pipes is fixedly installed on the inner side of the sealed cover corresponding to the observation hole area. The flushing point of the flushing pipe corresponding to the primary rotary screen 11 is equipped with a fan-shaped nozzle a15, and the flushing point of the flushing pipe corresponding to the secondary rotary screen 12 is equipped with a fan-shaped nozzle b18. The fan-shaped nozzles a15 and b18 are connected to the first pneumatic valve 16 and the second pneumatic valve 17 through pipes, respectively. The first pneumatic valve 16, the second pneumatic valve 17, the pressure transmitter 19, and the pipeline pump 20 are connected in sequence through pipes to form a complete cleaning water circuit. When the pressure of the main flushing water pipe is lower than the set pressure, the pipeline pump 20 starts and when it is higher than the set pressure, the pipeline pump 20 stops.

[0014] A slurry chute 13 is provided below the discharge end of the secondary rotary screen 12. The slurry chute 13 has a square cross-section and an opening and cover plate at the top. The end of the slurry chute 13 away from the secondary rotary screen 12 is connected to the storage tank 14. The slurry separated by the secondary rotary screen 12 flows into the storage tank 14 through the slurry chute 13 for storage.

[0015] The drive motor of the ash-making machine barrel 7 is equipped with dustproof and high-temperature resistant features, enabling it to operate stably in working environments containing dust and with high temperatures.

[0016] When in use, first turn on the drive motor of the bucket 7 of the ash smelting machine and adjust the speed of the bucket 7 through the frequency conversion motor; then turn on the ash smelting water inlet valve at the water inlet 4 and the plate pusher 2 in sequence. The plate pusher 2 sends the material in the raw material silo 1 into the feed inlet 3. The material and the ash smelting water entering through the water inlet 4 are mixed in the bucket 7 and fully digested as the bucket 7 rotates.

[0017] After digestion, the material flows to the primary rotating screen 11 at the tail of the barrel 7. The primary rotating screen 11 rotates with the barrel 7 to complete the initial filtration and separation. Some of the ash milk and fine sand continue to flow to the secondary rotating screen 12. The secondary rotating screen 12 rotates under the drive of an independent drive device to carry out further filtration and separation. The staff observes the separation effect of the screen through the rectangular observation hole on the side of the sealed cover. If it is found that the ash milk and sand are seriously mixed at the sand outlet under the screen, it is determined that rinsing is required.

[0018] At this time, the control system controls the first pneumatic valve 16 and the second pneumatic valve 17 to open in a set sequence according to the set program or manual instruction; the pressure transmitter 19 monitors the pressure of the flushing water pipeline in real time and transmits the signal to the control system. When the pressure of the main flushing water pipeline is lower than the set value, the control system starts the pipeline pump 20 to provide power for the flushing water, so that the flushing water is delivered to the fan-shaped nozzles a15 and b18; when the pressure is higher than the set value, the control system stops the pipeline pump 20 to avoid pipeline overpressure damage.

[0019] Among them, reference Figure 3 It can be seen that the controller in the control system indirectly controls the operation of the three-phase AC motor through pressure changes. In the initial state and start-up preparation stage, the power isolation switch QS is closed, and the three-phase AC power (L1, L2, L3) and the neutral wire (N) are introduced into the circuit. The current flows through the main circuit fuse FU1, preparing the motor's main circuit. At the same time, the control circuit ( Figure 3The thinner section (usually the right or lower part of the circuit) also receives power from the power source (such as phase L1), which flows through the control circuit fuse FU2 to the normally open contact (terminals 1-3) of the pressure relay KP. During automatic start-stop, when the pressure of the tested system does not reach the preset value of the pressure relay KP, its normally open contact (1-3) remains closed. At this time, the control circuit is activated, and current flows through the closed KP (1-3) contact, energizing the coil of the AC contactor KM. After the KM coil is energized, its three pairs of main contacts connected in parallel in the main circuit close immediately, forming a complete energizing path. The three-phase power supply (L1, L2, L3) flows through QS->FU1->KM main contacts->thermal element of thermal relay FR->driving the three-phase motor M to start running. During automatic stop, when the pressure of the tested system reaches or exceeds the preset value of the pressure relay KP, the internal mechanism of KP operates, and its normally open contact (1-3) opens. The control circuit is cut off, and the KM coil is de-energized. After the KM coil loses power, all its main contacts reset and open under the action of the spring, cutting off the power supply to the main circuit of the motor. The three-phase motor M loses power and stops running. This circuit has protection functions, including short-circuit protection and overload protection. During short-circuit protection, fuses FU1 and FU2 quickly blow when a short circuit occurs in the main circuit and control circuit, respectively, cutting off the power supply and protecting the lines and equipment. During overload protection, the thermal relay FR is connected in series in the main circuit. If the motor is overloaded due to faults or other reasons, the current flowing through its thermal element will be too large. After a certain delay, the normally closed contact inside FR (usually connected in series in the KM coil circuit) will open. Figure 3 (The circuit, though not explicitly shown, but certainly present, will trip, disconnecting the power supply to the KM coil and stopping the motor to prevent it from burning out due to prolonged overload.) Therefore, this circuit achieves an automatic cycle: low pressure → motor starts → pressure increases → pressure reaches the set value → motor automatically stops. The entire process requires no manual intervention; the pressure relay detects the pressure and automatically sends a control signal, which drives the motor via a contactor, achieving automatic pressure control.

[0020] The high-pressure water jets from fan-shaped nozzles a15 and b18 fully cover the screen surfaces of the primary rotating screen 11 and the secondary rotating screen 12, achieving reverse rinsing, removing adhering materials from the screens, and preventing blockages. The rinsing time can be set during the rinsing process, and the first pneumatic valve 16 and the second pneumatic valve 17 automatically switch at timed intervals to ensure the continuity and effectiveness of rinsing. Qualified ash milk flows into the storage tank 14 through the ash milk chute 13 for storage. The dustproof and high-temperature resistant motor ensures the safe and stable operation of the equipment and avoids production interruptions due to motor failure.

[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. An automatic cleaning structure for a screen of a slag smelting machine, comprising a raw material silo (1) and a barrel (7), characterized in that: The discharge end of the raw material silo (1) is correspondingly set to the feed end of the plate pusher (2); the discharge end of the plate pusher (2) is provided with a feed inlet (3) and a water inlet (4); the discharge end of the feed inlet (3) is movably connected to the feed end of the barrel (7) of the ash smelting machine; the feed inlet (3) is fixed and does not rotate with the barrel (7); the outer circumferential surface of the barrel (7) is fitted with a support roller ring A (5) and a support roller ring B (8), and a drive gear ring (6) is fitted on the outer circumferential surface of the barrel (7) between the support roller ring A (5) and the support roller ring B (8), and the drive gear ring (6) is connected to the output end of the motor. The discharge end of the barrel (7) is connected to a primary rotating screen (11) and a secondary rotating screen (12) in sequence along the material flow direction; the outer sides of the primary rotating screen (11) and the secondary rotating screen (12) are covered with independent sealed covers; a rectangular observation hole is opened on the side of the sealed cover; a set of multi-point flushing pipes is fixedly installed on the inner side of the sealed cover corresponding to the observation hole, and the flushing ends of the multi-point flushing pipes are respectively equipped with fan-shaped nozzles a (15) and b (18); a ash slurry chute (13) is set below the discharge end of the secondary rotating screen (12), and the discharge end of the ash slurry chute (13) is connected to the inlet of the storage tank (14). It also includes a pipeline pump (20), a pressure transmitter (19), a first pneumatic valve (16), and a second pneumatic valve (17); the pipeline pump (20) is connected to the pressure transmitter (19) through a pipeline; the outlet of the pressure transmitter (19) is connected to the inlet of the first pneumatic valve (16) and the second pneumatic valve (17) through a pipeline respectively; the outlet of the first pneumatic valve (16) is connected to the multi-point flushing pipe of the corresponding primary rotating screen (11) through a pipeline, and the outlet of the second pneumatic valve (17) is connected to the multi-point flushing pipe of the corresponding secondary rotating screen (12) through a pipeline.

2. The automatic cleaning structure for a screen of a slag smelting machine according to claim 1, characterized in that: The primary rotating screen (11) rotates simultaneously with the barrel (7); the outer side of the secondary rotating screen (12) is provided with an independent driving device; the output end of the independent driving device is connected to the secondary rotating screen (12) in a transmission connection.

3. The automatic cleaning structure for a screen of a slag-making machine according to claim 1, characterized in that: The top of the sealed cover of the primary rotating screen (11) is provided with a primary rotating screen exhaust chimney (9); the lower end of the primary rotating screen exhaust chimney (9) is connected to the inside of the sealed cover; the top of the sealed cover of the secondary rotating screen (12) is provided with a secondary rotating screen exhaust chimney (10); the lower end of the secondary rotating screen exhaust chimney (10) is connected to the inside of the sealed cover.

4. The automatic cleaning structure for a slag removal machine screen according to claim 1, characterized in that: The cross-section of the molten lime chute (13) is square; the top of the molten lime chute (13) has an opening; a cover plate is movably closed at the opening; the cover plate is detachably connected to the top edge of the molten lime chute (13).

5. The automatic cleaning structure for a screen of a slag smelting machine according to claim 1, characterized in that: The first pneumatic valve (16) and the second pneumatic valve (17) are electrically connected to the controller.

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