A closed automatic conveying system for tin fume dust

Abstract

The utility model discloses a kind of tin fume closed type automatic conveying systems, using PLC control system to carry out automatic control, fume bin receives fume particle;Feeding tank is located below fume bin and is communicated fume bin;Feeding tank is communicated top blowing furnace by air conveying pipe;Sweeping part is parallel connected with air conveying pipe to blow into compressed air to its inner chamber;Pressure relief part is communicated the inner chamber of fume bin and feeding tank by pipeline to balance pressure;Vulcanization part carries out vulcanization to fume particle in feeding tank.The utility model carries out blowing to air conveying pipe using sweeping part before fume conveying, then fume particle in fume bin is conveyed to feeding tank, fume quantity in feeding tank reaches design value, then opening pressure relief part carries out pressure relief to fume bin and feeding tank, then fume in feeding tank is vulcanized by vulcanization part, finally feeding tank is conveyed to top blowing furnace by air conveying pipe to carry out reduction smelting of fume particle.

Description

Technical Field

[0001] This utility model relates to the field of tin smelting fume material reduction and smelting technology, and more specifically to a closed automatic conveying system and method for tin fume. Background Technology

[0002] Tin smelting fumes mainly consist of calcining furnace dust, top-blown furnace dust, and fuming furnace dust. These fumes are collected separately and then transported to the raw material silo via silo pumps for granulation. The granulated fumes are then mixed with other materials and conveyed by belt to the top-blown furnace for reduction smelting. Currently, the fumes are transported over long distances and undergo numerous transfers, consuming significant amounts of gas and electricity. Furthermore, water needs to be added during granulation, but this added moisture is useless and energy-intensive for the smelting process. However, to maintain a good working environment and reduce mechanical dust, process water replenishment is unavoidable.

[0003] Therefore, in the process of reducing and smelting tin fume materials, on the one hand, in order to have a good working environment and reduce mechanical dust, additional water is added, resulting in more fuel consumption during the smelting process; on the other hand, in order to save energy and reduce consumption, it is desirable for the material to have a low moisture content, thus creating a contradiction.

[0004] Based on the above analysis, how to rationally utilize the characteristics of raw materials, reduce energy consumption, and maximize economic benefits has become an urgent problem to be solved in this field. Therefore, this utility model proposes a closed automatic conveying system and method for tin fume, which reduces the number of times fume particles are transported and allows the fume particles to be directly fed into the furnace. On the other hand, it reduces the addition of water, thereby reducing the production cost of fume particle smelting, saving energy, and reducing the recycling consumption of materials. Utility Model Content

[0005] In view of this, the present invention provides a closed-loop automatic conveying system and method for tin fume, which solves the problems of powder pollution and loss caused by the traditional tin fume transfer process.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A closed-loop automatic conveying system for tin fumes, employing a PLC control system for automatic control, includes:

[0008] The dust receiving section includes a dust chamber, with a dust inlet and a dust outlet formed by the top and bottom of the dust chamber respectively. The dust inlet receives dust particles generated by the production equipment.

[0009] The dust conveying unit includes a feeding tank, which is located below the dust silo and its top end is connected to the dust outlet via a rubber hose; the bottom end of the feeding tank is connected to the top-blown furnace via an air conveying pipe.

[0010] A purging section, comprising a purging pipe, both ends of which are connected to the air delivery pipe to blow compressed air into the inner cavity of the end pipe in the delivery direction.

[0011] The pressure relief section is connected to the inner cavity of the dust bin and the feeding tank through a pipeline to relieve pressure on them;

[0012] The vulcanization section includes a vulcanization pipe, the two ends of which are respectively connected to the inner cavity of the feeding tank and external equipment to vulcanize the dust particles in the feeding tank.

[0013] The beneficial effects of the above technical solution are that the automatic conveying system uses a PLC control system to set initial values ​​and execute automatic control operations. Before the dust is conveyed, the air conveying pipe is purged by the purging unit. After the inner wall of the air conveying pipe is free of dust particles, the dust particles in the dust bin are conveyed to the feeding tank. After the amount of dust in the feeding tank reaches the design value, the pressure relief unit is opened to relieve pressure in the dust bin and the feeding tank and maintain the pressure. Then, the dust in the feeding tank is vulcanized by the vulcanization unit to prevent the dust particles from agglomerating into lumps in the feeding tank and being unable to be conveyed. Finally, the feeding tank conveys the dust particles to the top-blown furnace through the air conveying pipe for the reduction and smelting of the dust particles.

[0014] Preferably, the pressure relief section is located outside the dust silo and the feeding tank, and includes an air pipe, a branch pipe, an exhaust isolation valve, an exhaust ball valve for the feeding tank, and an exhaust ball valve for the dust silo.

[0015] The two ends of the air pipe are respectively connected to the inner cavity at the top of the dust bin and the inner cavity at the top of the feeding tank; one end of the branch pipe is connected to the inner cavity at the bottom of the dust bin, and the other end is connected to the inner cavity of the air pipe through the first tee pipe.

[0016] The exhaust isolation valve and the feed tank exhaust ball valve are fixed from top to bottom to the air pipe between the feed tank and the first three-way pipe; the dust chamber exhaust ball valve is fixed to the branch pipe.

[0017] The beneficial effect of the above technical solution is that, through the cooperation of the exhaust isolation valve, the feed tank exhaust ball valve and the dust hopper exhaust ball valve, the pressure balance between the dust hopper and the feed tank can be maintained after the dust particles in the dust hopper enter the feed tank, thus avoiding the generation of pressure difference that would affect the dust conveying effect.

[0018] Preferably, a screw feeder is rotatably connected to the inner wall of the bottom end of the feeding tank; the discharge port of the screw feeder is connected to the inner cavity of the feeding tank through a conveying branch pipe located outside the feeding tank, the conveying branch pipe is connected to one end of the air conveying pipe through a second three-way pipe, and the other end of the air conveying pipe is connected to the top blown furnace; an air conveying control valve is fixed on the air conveying pipe near the second three-way pipe.

[0019] The beneficial effect of the above technical solution is that the screw feeder is used to transport the dust particles in the feeding tank, and the opening and closing of the dust particle material flow passage between the air conveying pipe and the feeding tank is controlled by the air conveying control valve.

[0020] Preferably, the purging unit further includes a first purging valve, an air flow regulating valve, and a second purging valve;

[0021] Both ends of the purge pipe are connected to the air delivery pipe via a third tee pipe;

[0022] The first purge valve is fixed on the purge pipe, and the air flow regulating valve and the second purge valve are sequentially fixed on the air conveying pipe between the two third tee pipes along the dust conveying direction.

[0023] The beneficial effects of the above technical solution are that the purge pipe can introduce compressed air to purge the inner wall of the flue gas conveying pipe, the input amount of compressed air can be adjusted by the first purge valve and the second purge valve, and the compressed air flow can be monitored by the air flow regulating valve.

[0024] Preferably, a pressure detector and a flow detector are fixed sequentially along the conveying direction of the air delivery pipe between the purge pipe and the top blown furnace;

[0025] The air delivery pipe between the flow meter and the top-blown furnace is connected to the bottom of the feeding tank via a fourth tee pipe and a rubber connecting pipe. A feeding outlet control valve is fixed on the rubber connecting pipe.

[0026] The beneficial effects of the above technical solution are that the pressure detector can detect the pipeline pressure in the air conveying pipe, the flow detector can detect the conveying flow rate of dust particles in the air conveying pipe, and the feeding outlet control valve can control the opening and closing of the feeding tank outlet.

[0027] Preferably, the vulcanization section includes a vulcanization ring and a vulcanization control valve; the outer wall of the vulcanization ring is fixed to the inner wall of the feeding tank, and the vulcanization ring is connected to the air supply pipe between the air supply control valve and the purge pipe through a vulcanization pipe and a four-way pipe, and the four-way pipe is connected to an external compressed air input device or a vulcanization device.

[0028] The beneficial effects of the above technical solution are as follows: the three ports of the four-way pipe are connected to the air conveying pipe and the vulcanizing pipe respectively, and one port is connected to external equipment for blowing in compressed air; when the dust particles enter the feeding tank, the sulfur valve and the air conveying control valve are opened, and the compressed air enters the feeding tank through the four-way pipe along the air conveying pipe. At the same time, the vulcanizing medium can enter the vulcanizing ring through the vulcanizing pipe to vulcanize the dust particles in the feeding tank and prevent them from agglomerating; the feeding outlet control valve is opened, and the compressed air can blow the dust particles in the feeding tank into the top-blown furnace.

[0029] Preferably, the bottom of the dust bin is provided with a dust outlet dome valve, and the top of the feeding tank is provided with a feeding inlet dome valve. The dust outlet dome valve and the feeding inlet dome valve are connected by a rubber hose.

[0030] The beneficial effect of the above technical solution is that opening the dust outlet dome valve allows the dust particles in the dust chamber to fall freely into the rubber hose, and opening the feed inlet dome valve allows the dust particles in the rubber hose to fall freely into the feed tank.

[0031] Preferably, both the dust bin and the feeding tank are cone-shaped.

[0032] A baghouse dust collector is fitted around the top of the dust chamber, and an induced draft fan is fixed to the top of the baghouse dust collector; a dust vibrator is fixed to the bottom outer wall of the dust chamber, and a filter screen is fixed to its bottom end face.

[0033] A high-level switch is fixed to the outer wall of the top of the feeding tank, and a feeding vibrator is fixed to the outer wall of its bottom.

[0034] The beneficial effects of the above technical solution are that the bag dust collector can collect the dust generated directly by the production equipment or the dust transported by the production equipment through the flue; the induced draft fan can improve the efficiency of dust entering the dust chamber; the dust vibrator generates a vibration effect to prevent dust particles from adhering to the inner wall of the dust chamber; and the filter screen can filter impurities in the dust to ensure the purity of the dust particles.

[0035] The high-level switch can control the amount of dust particles entering the feed tank to prevent the dust hopper from bursting; the feed vibrator generates vibration to prevent dust particles from adhering to the inner wall of the dust hopper.

[0036] Preferably, a weighing instrument is fixed to the outer wall of the top of the feeding tank.

[0037] The beneficial effect of the above technical solution is that a weighing instrument can be used to replace the high-level switch, and the amount of dust particles in the feed tank can be determined by weighing.

[0038] Preferably, the PLC control system includes a PLC controller, a switch, a host computer, a PLC communication module, a remote control module, a data acquisition module, and a data output module;

[0039] The PLC controller is communicatively connected to the switch; the switch is communicatively connected to the host computer; the PLC communication module is communicatively connected to the PLC controller; the remote control module is communicatively connected to the PLC controller; the data acquisition module and the data output module are respectively connected in series with the remote control module for data interaction; the data acquisition module and the data output module are electrically connected to the automatic conveying system to acquire system data and transmit it to the PLC controller via the remote control module; the PLC controller generates control commands based on the crude tin smelting process and the host computer data and transmits them to the data output module; the data output module controls the system to work according to the control commands.

[0040] The PLC communication module collects data on the various stages of the crude tin smelting process.

[0041] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a closed-loop automatic conveying system for tin fumes. The system opens the air conveying control valve and the vulcanizing valve, simultaneously starting the screw feeder and opening the feeding outlet control valve. Compressed air enters the feeding tank through the air conveying pipe, blowing the fumes particles through the rubber connecting pipe and the conveying end of the air conveying pipe into the top-blown furnace for reduction smelting. The system automatically starts the conveying system according to the crude tin smelting conditions in the top-blown furnace. During the start-up process, each execution system executes according to the set conditions. The entire process achieves one-button automatic control, greatly reducing manual intervention and improving production efficiency, showcasing a highlight of process control in the global crude tin smelting industry. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the dust conveying system layout provided by this utility model;

[0044] Figure 2 A schematic diagram of the layout of the PLC control system provided by this utility model.

[0045] in,

[0046] 1-Dust receiving section; 11-Dust bin; 12-Exhaust fan; 13-Bag collector; 14-Dust vibrator; 15-Filter screen; 16-Dust outlet dome valve;

[0047] 2-Dust conveying unit; 21-Feeding tank; 22-Feeding inlet dome valve; 23-High level switch; 24-Weighing instrument; 25-Feeding vibrator; 26-Screw feeder; 27-Feeding outlet control valve; 28-Second tee pipe; 29-Air conveying pipe;

[0048] 3-Purge section; 31-First purge valve; 32-Second purge valve; 33-Air flow regulating valve; 34-Third tee pipe; 35-Purge pipe;

[0049] 4-Pressure relief section; 41-Exhaust isolation valve; 42-Dust silo exhaust ball valve; 43-Feed tank exhaust ball valve; 44-First tee pipe; 45-Air pipe; 46-Branch pipe;

[0050] 5-Vulcanizing section; 51-Vulcanizing ring; 52-Vulcanizing control valve;

[0051] 6-Air delivery control valve;

[0052] 7-Pressure measuring instrument;

[0053] 8-Flow meter;

[0054] 9-PLC control system; 91-Host computer; 92-Switch; 93-PLC controller; 94-PLC communication module; 95-Remote control module; 96-Data acquisition module; 97-Data output module. Detailed Implementation

[0055] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0056] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0057] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0060] Example 1:

[0061] See appendix Figures 1-2 This utility model discloses a closed-loop automatic conveying system for tin fumes, which is automatically controlled by a PLC control system 9, including:

[0062] Dust receiving section 1 includes a dust chamber 11, with the top and bottom of the dust chamber 11 connected to form a dust inlet and a dust outlet, respectively. The dust inlet receives dust particles generated by the production equipment.

[0063] Dust conveying unit 2 includes a feeding tank 21, which is located below the dust silo 11 and its top is connected to the dust outlet via a rubber hose; the bottom of the feeding tank 21 is connected to the top-blown furnace via an air conveying pipe 29.

[0064] The purging section 3 includes a purging pipe 35, both ends of which are connected to the air delivery pipe 29 to blow compressed air into the inner cavity of the end pipe in the delivery direction.

[0065] Pressure relief section 4 is connected to the inner cavity of dust bin 11 and feed tank 21 through pipeline to relieve pressure on them;

[0066] The vulcanization section 5 includes a vulcanization tube, the two ends of which are respectively connected to the inner cavity of the feeding tank 21 and external equipment to vulcanize the dust particles in the feeding tank 21.

[0067] like Figure 1 As shown, in order to clearly introduce this utility model, this embodiment describes the dust conveying system according to the top, bottom, left and right directions of the drawings.

[0068] To further optimize the above technical solution, the pressure relief part 4 is located outside the dust hopper 11 and the feeding tank 21, and includes an air pipe 45, a branch pipe 46, an exhaust isolation valve 41, a feeding tank exhaust ball valve 43 and a dust hopper exhaust ball valve 42.

[0069] The two ends of the air pipe 45 are respectively connected to the inner cavity at the top of the dust chamber 11 and the inner cavity at the top of the feeding tank 21; one end of the branch pipe 46 is connected to the inner cavity at the bottom of the dust chamber 11, and the other end is connected to the inner cavity of the air pipe 45 through the first three-way pipe 44.

[0070] The exhaust isolation valve 41 and the feed tank exhaust ball valve 43 are fixed from top to bottom on the air pipe 45 between the feed tank 21 and the first three-way pipe 44; the dust chamber exhaust ball valve 42 is fixed on the branch pipe 46.

[0071] The upper end of the first three-way pipe is connected to the inner cavity at the top of the dust chamber via an air pipe, the lower end is connected to the inner cavity at the top of the dust chamber via an air pipe, and the right end is fixed to one end of the branch pipe; the other end of the branch pipe is connected to the dust outlet at the bottom of the dust chamber.

[0072] To further optimize the above technical solution, a screw feeder 26 is rotatably connected to the inner wall of the bottom end of the feeding tank 21; the discharge port of the screw feeder 26 is connected to the inner cavity of the feeding tank 21 through a conveying branch pipe located outside the feeding tank 21, and the conveying branch pipe is connected to one end of the air conveying pipe 29 through the second three-way pipe 28, and the other end of the air conveying pipe 29 is connected to the top blown furnace; an air conveying control valve 6 is fixed on the air conveying pipe 29 near the second three-way pipe 28.

[0073] The upper end of the second three-way pipe is connected to the top of the feeding tank through a conveying branch pipe, and the lower end is connected to the screw feeder. The screw feeder, in conjunction with compressed air, pumps the dust particles in the feeding tank into the top-blown furnace.

[0074] To further optimize the above technical solution, the purging unit 3 also includes a first purging valve 31, an air flow regulating valve 33, and a second purging valve 32;

[0075] Both ends of the purge pipe 35 are connected to the air delivery pipe 29 via the third tee pipe 34;

[0076] The first purge valve 31 is fixed on the purge pipe 35, and the air flow regulating valve 33 and the second purge valve 32 are fixed sequentially on the air conveying pipe 29 between the two third tee pipes 34 along the dust conveying direction.

[0077] To further optimize the above technical solution, a pressure detector 7 and a flow detector 8 are fixed sequentially on the air conveying pipe 29 between the purge pipe 35 and the top blown furnace along its conveying direction.

[0078] The air delivery pipe 29 between the flow meter 8 and the top blown furnace is connected to the bottom of the feeding tank 21 through a fourth tee pipe and a rubber connecting pipe. The feeding outlet control valve 27 is fixed on the rubber connecting pipe.

[0079] To further optimize the above technical solution, the vulcanization section 5 includes a vulcanization ring 51 and a vulcanization control valve 52; the outer wall of the vulcanization ring 51 is fixed to the inner wall of the feeding tank 21, and the vulcanization ring 51 is connected to the air supply pipe 29 between the air supply control valve 6 and the purge pipe 35 through the vulcanization pipe and the four-way pipe, and the four-way pipe is connected to the external compressed air input device or the vulcanization device.

[0080] The right port of the third three-way pipe on the left is connected to the second purge valve, the air flow regulating valve, and the lower port of the third three-way pipe on the right; the upper port of the third three-way pipe on the left is connected to the first purge valve and the left port of the third three-way pipe on the right.

[0081] The upper port of the fourth three-way pipe is connected to the feed outlet control valve, the right port is connected to the flow detector, the pressure detector and the left port of the third three-way pipe on the left, and the left port of the fourth three-way pipe is connected to the top blown furnace.

[0082] The upper port of the four-way pipe is connected to the air delivery control valve and the right port of the second three-way pipe, and the lower port is connected to the upper port of the third three-way pipe on the right side; the left port is connected to the vulcanizing valve and the vulcanizing ring, and the right port is used to input compressed air or vulcanizing medium.

[0083] In this embodiment, compressed air is introduced into the right port of the four-way pipe to purge the inner wall of the air conveying pipe, or a sulfiding medium is introduced into the feeding hopper to sulfidate the dust particles.

[0084] In some other specific embodiments, the sulfidation medium can be sulfur-containing compressed air, which simultaneously purifies the pipeline and sulfidates the dust particles, and the right port of the four-way pipe can be connected to the compressed air equipment.

[0085] To further optimize the above technical solution and facilitate the separate control of dust particles in the dust bin and the feeding tank, a dust outlet dome valve 16 is provided at the bottom of the dust bin 11, and a feeding inlet dome valve 22 is provided at the top of the feeding tank 21. The dust outlet dome valve 16 and the feeding inlet dome valve 22 are connected by a rubber hose.

[0086] To further optimize the above technical solution and ensure that the dust particles in the dust bin and the feeding tank can be completely transported into the top-blown furnace, the dust bin 11 and the feeding tank 21 are both cone-shaped.

[0087] A baghouse dust collector 13 is fitted around the top of the dust collection chamber 11, and an induced draft fan 12 is fixed to the top of the baghouse dust collector 13; a dust vibrator 14 is fixed to the bottom outer wall of the dust collection chamber 11, and a filter screen 15 is fixed to its bottom end face.

[0088] A high level switch 23 is fixed to the outer wall of the top of the feeding tank 21, and a feeding vibrator 25 is fixed to the outer wall of its bottom.

[0089] In some other embodiments, a weighing device 24 is fixed to the outer wall of the top of the feeding tank 21. The weighing device can replace the high-level switch to control the content of dust particles in the feeding tank.

[0090] like Figure 2 As shown, the PLC control system 9 in this embodiment includes a PLC controller 93, a switch 92, a host computer 91, a PLC communication module 94, a remote control module 95, a data acquisition module 96, and a data output module 97.

[0091] PLC controller 93 communicates with switch 92 via industrial Ethernet; switch 92 communicates with host computer 91 via industrial Ethernet; PLC communication module 94 communicates with PLC controller; remote control module 95 communicates with PLC controller 93 via industrial Ethernet; data acquisition module 96 and data output module 97 are connected in series with PLC communication module 94 for data interaction; data acquisition module 96 and data output module 97 are electrically connected to automatic conveying system via industrial cable to acquire system data and transmit it to PLC controller 93 via remote control module 95; PLC controller 93 generates control commands based on crude tin smelting process and host computer 91 data and transmits them to data output module 97; data output module 97 controls the system to work according to the control commands.

[0092] The PLC communication module 94 connects to the top-blown furnace system for crude tin smelting via industrial Ethernet to collect data on the various stages of the crude tin smelting process.

[0093] To further optimize the above technical solution, a tank pressure detector is fixed on the top of the feeding tank to detect the pressure inside the feeding tank.

[0094] Example 2:

[0095] This utility model discloses a closed-loop automatic conveying method for tin fumes, which uses the closed-loop automatic conveying system for tin fumes reduction smelting in Embodiment 1, and includes the following steps:

[0096] S1, PLC control system 9 performs numerical settings and executes automatic control;

[0097] Based on the actual situation and combined with the field data collected by the data acquisition module, the values ​​of pipeline purging time, conveying volume, full tank weight of the feeding tank, empty tank weight of the feeding tank, and upper limit pressure of the air conveying pipeline are first set, and the control mode of the device is put into automatic. The system enters the one-key start state according to the smelting situation.

[0098] S2, the purging section 3 is opened and the inner cavity of the air delivery pipe 29 is purged;

[0099] Compressed air enters the air delivery pipe through the four-way pipe. The system automatically opens the first and second purge valves to purge the inner wall of the air delivery pipe. It determines whether the purging time has reached the set time and the purging ends. The pressure detector detects the pressure in the air delivery pipe and determines whether the purging is successful based on the pipe pressure detection value. If the purging is successful, the tin fume is transported. If the purging is unsuccessful, it is determined that the pipe is blocked and manual cleaning is performed.

[0100] S3, the dust collected in the dust bin 11 enters the feeding tank 21;

[0101] Determine if the pressure in the feeding tank is less than the set value. If so, open the dome valve at the feeding inlet and delay for 5 seconds.

[0102] When the timer expires, the dust outlet dome valve is opened, and the dust particles fall freely into the feeding tank. The loading timer starts, the feeding tank begins loading, and the screw feeder is started.

[0103] When the dust particles in the dust bin are fed out slowly, the dust vibrator is activated to vibrate the inner wall of the dust bin, so that the dust particles in the dust bin will not adhere to the inner wall of the dust bin.

[0104] S4, Pressure relief section 4 is activated to relieve pressure;

[0105] When the high-level switch signal of the feeding tank is triggered, or the packing timer expires, or the data measured by the weighing instrument reaches the maximum weight setting value of the feeding tank, the dust outlet dome valve is closed, the 3-second delay timer starts counting, and the screw feeder is shut down.

[0106] When the timer expires, close the dome valve at the feeding inlet and start the timer again after a 3-second delay; the content of dust particles in the feeding tank reaches the design value.

[0107] When the timer expires, open the exhaust ball valve and exhaust isolation valve of the feeding tank, and the 1-second delay timer will start; this will release excess air pressure from the feeding tank.

[0108] When the delay timer expires, the exhaust isolation valve will close.

[0109] S5, the vulcanization section 5 starts and vulcanizes the dust particles in the feeding tank 21; the dust conveying section 2 conveys the vulcanized dust particles to the top blown furnace for reduction smelting.

[0110] Open the air delivery control valve and the vulcanizing valve, and start the 3-second delay timer; compressed air enters the feeding tank through the four-way pipe and enters the vulcanizing ring through the vulcanizing pipe to vulcanize the dust particles in the feeding tank;

[0111] When the timer expires and the pressure inside the feeding tank is greater than the pressure in the air conveying pipeline, the feeding outlet control valve is opened and the delay timer starts counting down for 5 seconds.

[0112] When the timer expires, the screw feeder is turned on; the dust particles in the feeding tank are fed through the screw feeder into the air conveying pipe under the action of compressed air until they enter the top blown furnace.

[0113] When the pressure in the feeding tank is lower than the set pressure of the empty feeding tank, the screw feeder is stopped; this indicates that the dust particles in the feeding tank have been completely blown in; under this condition, the feeding vibrator can be turned on to vibrate the inner wall of the feeding tank so that the dust particles attached to its inner wall can enter the end of the air conveying pipe and finally enter the top blown furnace.

[0114] Determine if the pressure in the air delivery pipe is less than the set pressure of the empty feed tank. If so, start the 3-second delay timer; this indicates that the dust particles in the air delivery pipe have been blown into the top-blown furnace.

[0115] When the timer expires, close the vulcanizing valve, the second purge valve, and the feed outlet control valve; the outlet end inside the feed tank is now sealed.

[0116] Open the exhaust isolation valve, and the delay timer will start counting after 3 seconds;

[0117] When the timer expires, open the exhaust ball valve of the dust chamber, and the 3-second delay timer will start counting down; this will release the air pressure inside the dust chamber, ensuring that the dust particles can fall freely.

[0118] When the timer expires and the pressure inside the feeding tank is less than the set value, the timer will be reset cyclically for 3 seconds.

[0119] When the cycle reset timer expires, the cycle ends and the next round of dust particle conveying begins.

[0120] To further optimize the above technical solution, a control program written on the host computer is used to control the conveying of tin fume materials, realize the accurate calculation of the amount of fume conveyed, and then perform PID adjustment on the speed of the screw feeder and the opening of the conveying air volume control valve according to the actual blowing value.

[0121] To further optimize the above technical solution, the actual conveying volume of tin fume is obtained by multiplying the weight reduction of the feed can per second by 3600 seconds.

[0122] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0123] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A closed-loop automatic conveying system for tin fumes, characterized in that, Automatic control is performed using a PLC control system (9), including: The dust receiving part (1) includes a dust chamber (11), the top and bottom of the dust chamber (11) are connected to form a dust inlet and a dust outlet respectively, and the dust inlet receives dust particles generated by the production equipment; The dust conveying unit (2) includes a feeding tank (21), which is located below the dust silo (11) and its top end is connected to the dust outlet via a rubber hose; the bottom end of the feeding tank (21) is connected to the top blown furnace via an air conveying pipe (29); The purging section (3) includes a purging pipe (35), both ends of which are connected to the air conveying pipe (29) to blow compressed air into the inner cavity of the end pipe in the conveying direction; a pressure detector (7) and a flow detector (8) are fixed in sequence along the conveying direction of the air conveying pipe (29) between the purging pipe (35) and the top-blown furnace; the pipe of the air conveying pipe (29) between the flow detector (8) and the top-blown furnace is connected to the bottom end of the feeding tank (21) through a fourth three-way pipe and a rubber connecting pipe, and a feeding outlet control valve (27) is fixed on the rubber connecting pipe. Pressure relief section (4), the pressure relief section (4) is connected to the inner cavity of the dust bin (11) and the feeding tank (21) through a pipeline to relieve pressure on them; The vulcanizing section (5) includes a vulcanizing pipe, the two ends of which are respectively connected to the inner cavity of the feeding tank (21) and external equipment to vulcanize the dust particles in the feeding tank (21); the vulcanizing section (5) includes a vulcanizing ring (51) and a vulcanizing control valve (52); the outer wall of the vulcanizing ring (51) is fixed to the inner wall of the feeding tank (21), the vulcanizing ring (51) is connected to the air delivery pipe (29) between the air delivery control valve (6) and the purge pipe (35) through the vulcanizing pipe and the four-way pipe, and the four-way pipe is connected to an external compressed air input device or a vulcanizing device; wherein, the upper port of the four-way pipe is connected to the air delivery control valve (6), the lower port is connected to the upper port of the third three-way pipe, the left port is connected to the vulcanizing valve, and the right port is for inputting compressed air or vulcanizing medium; The purging unit (3) also includes a first purging valve (31), an air flow regulating valve (33), and a second purging valve (32); both ends of the purging pipe (35) are connected to the air delivery pipe (29) through a third three-way pipe (34); the first purging valve (31) is fixed on the purging pipe (35), and the air flow regulating valve (33) and the second purging valve (32) are fixed sequentially on the air delivery pipe (29) between the two third three-way pipes (34) along the dust conveying direction; The PLC control system (9) includes a PLC controller (93), a switch (92), a host computer (91), a PLC communication module (94), a remote control module (95), a data acquisition module (96), and a data output module (97). The PLC controller (93) is communicatively connected to the switch (92); the switch (92) is communicatively connected to the host computer (91); the PLC communication module (94) is communicatively connected to the PLC controller (93); the remote control module (95) is communicatively connected to the PLC controller (93); the data acquisition module (96) and the data output module (97) are connected in series with the remote control module (95) for data interaction; the data acquisition module (96) and the data output module (97) are electrically connected to the automatic conveying system to acquire system data and transmit it to the PLC controller (93) through the remote control module (95); the PLC controller (93) generates control instructions based on the crude tin smelting process and the data from the host computer (91) and transmits them to the data output module (97); the data output module (97) controls the system to work according to the control instructions. The PLC communication module (94) collects data on the stages of the crude tin smelting process.

2. The closed-loop automatic conveying system for tin fumes according to claim 1, characterized in that, The pressure relief section (4) is located outside the dust chamber (11) and the feeding tank (21), and includes an air pipe (45), a branch pipe (46), an exhaust isolation valve (41), a feeding tank exhaust ball valve (43), and a dust chamber exhaust ball valve (42). The two ends of the air pipe (45) are respectively connected to the inner cavity at the top of the dust chamber (11) and the inner cavity at the top of the feeding tank (21); one end of the branch pipe (46) is connected to the inner cavity at the bottom of the dust chamber (11), and the other end is connected to the inner cavity of the air pipe (45) through the first three-way pipe (44); The exhaust isolation valve (41) and the feed tank exhaust ball valve (43) are fixed from top to bottom on the air pipe (45) between the feed tank (21) and the first three-way pipe (44); the dust chamber exhaust ball valve (42) is fixed on the branch pipe (46).

3. The closed-loop automatic conveying system for tin fumes according to claim 1, characterized in that, The bottom inner wall of the feeding tank (21) is rotatably connected to a screw feeder (26); the discharge port of the screw feeder (26) is connected to the inner cavity of the feeding tank (21) through a conveying branch pipe located outside the feeding tank (21); the conveying branch pipe is connected to one end of the air conveying pipe (29) through a second three-way pipe (28); the other end of the air conveying pipe (29) is connected to a top-blown furnace; an air conveying control valve (6) is fixed on the air conveying pipe (29) near the second three-way pipe (28).

4. The closed-loop automatic conveying system for tin fumes according to claim 1, characterized in that, The bottom of the dust chamber (11) is provided with a dust outlet dome valve (16), and the top of the feeding tank (21) is provided with a feeding inlet dome valve (22). The dust outlet dome valve (16) and the feeding inlet dome valve (22) are connected by a rubber hose.

5. The closed-loop automatic conveying system for tin fumes according to claim 4, characterized in that, Both the dust bin (11) and the feeding tank (21) are cone-shaped. The dust collection chamber (11) is fitted with a bag dust collector (13) on the outer periphery of the top, and a blower (12) is fixed to the top of the bag dust collector (13); a dust vibrator (14) is fixed to the outer wall of the bottom of the dust collection chamber (11), and a filter screen (15) is fixed to its bottom end face. The top outer wall of the feeding tank (21) is fixed with a high material level switch (23), and the bottom outer wall is fixed with a feeding vibrator (25).

6. The closed-loop automatic conveying system for tin fumes according to claim 5, characterized in that, Alternatively, a weighing instrument (24) may be fixed to the outer wall of the top of the feeding tank (21).

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