Automatic start-stop switching control system for multiple filter pressing groups

Abstract

The utility model discloses an automatic start-stop switching control system for a plurality of filter pressing groups, which comprises a to-be-pressed filtrate storage tank, the plurality of filter pressing groups and a control cabinet, the to-be-pressed filtrate storage tank is connected with the plurality of filter pressing groups in parallel, and each filter pressing group comprises a filter pressing pump, a filter press, a filter pressing residue size mixing tank and a filter pressing residue size pump which are sequentially connected. A frequency converter is arranged at the front end of each filter pressing pump, the filter pressing pumps and the filter pressing residue slurry pump of the filter press are respectively connected into the control cabinet, and under the control of the control cabinet, each filter pressing group is automatically started and stopped, switched and circularly operated. According to the utility model, full-automatic start-stop switching control of a plurality of filter pressing groups in hydrometallurgy can be realized.

Description

Technical Field

[0001] The utility model relates to the control of a filter press system in hydrometallurgy, in particular to a system for automatically starting and stopping switching control of multiple filter press groups in hydrometallurgy. Background Art

[0002] In wet smelting production, one workstation is equipped with multiple filter press groups (one filter press group includes one filter press pump, one or more filter presses, one filter press residue slurry mixing tank and one filter press residue slurry pump). Multiple filter press groups need to rotate to perform filter press operations to achieve shift operation production.

[0003] At present, the filter press operation is generally carried out manually. When the operator sees that the amount of filtrate discharged from a filter press is small, he will manually stop the filter press pump and then manually start the filter press to pull the plate to unload the slag. Then, he will manually start another set of filter press pumps and filter presses to filter to meet production needs.

[0004] In actual operation, there is no quantitative indicator for stopping the filter press pump, which depends entirely on human observation, which can easily lead to insufficient filtration or "over-filtration", which can easily lead to misjudgment. At the same time, the filter press pump runs at a fixed frequency, resulting in unstable liquid level in the filtrate storage tank and large changes in the filtrate flow rate, which is not conducive to subsequent production.

[0005] In addition, manual filter pressing operations require a large number of on-site operators, have a low degree of automation, low production efficiency, high labor costs, and are prone to errors. Utility Model Content

[0006] The technical problem to be solved by the utility model is that, in view of the deficiency of manual operation of filter pressing in the hydrometallurgical industry, the utility model provides a system for automatic start-stop switching control of multiple filter pressing groups capable of realizing full-automatic operation of filter pressing.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A system for automatic start-stop switching control of multiple filter press groups, comprising a storage tank for filtrate to be pressed, multiple filter press groups and a control cabinet, wherein the storage tank for filtrate to be pressed is connected to multiple filter press groups in parallel, each filter press group comprises a filter press pump, a filter press, a filter press residue slurry mixing tank, and a filter press residue slurry pump connected in sequence, a frequency converter is installed at the front end of each filter press pump, and the filter press pump and the filter press residue slurry pump are respectively connected to the control cabinet, and under the control of the control cabinet, each filter press group automatically starts and stops and switches to cyclic operation.

[0009] Preferably, a liquid inlet pipe and a liquid level detection device are respectively arranged in each of the filtrate storage tanks and the filter press residue slurry mixing tank, a control valve is respectively installed on each of the liquid inlet pipes, a current detection device is installed on the control circuit of each of the filter press pumps, and each of the liquid level detection device, control valve and current detection device is respectively connected to the control cabinet.

[0010] Preferably, the storage tank for the filtrate to be pressed is provided with a pump cut-off level for indicating the switching of the filter press group and a target level for indicating that the filter press group is in a normal working state, a pressure transmitter is provided on the output pipeline of the filter press pump, the filter press residue slurry adjustment tank is provided with a slurry adjustment level, a pump stop level and a stirring start-stop level, and the slurry adjustment level>a stirring start-stop level>a pump stop level, the level detection device of the storage tank for the filtrate to be pressed detects the actual level of the storage tank for the filtrate to be pressed and transmits it to the control cabinet, and the level detection device of the filter press residue slurry adjustment tank detects the actual level of the filter press residue slurry adjustment tank. The control cabinet detects the actual liquid level of the filter press liquid storage tank, the actual liquid level of the filter press residue slurry mixing tank, the operating current of the filter press pump and the outlet pressure transmitted by the pressure transmitter, and controls the start, stop and switch of the filter press pump, the filter press, the filter press residue slurry mixing tank and the filter press residue slurry pump in real time according to the actual liquid level of the filter press liquid storage tank, the actual liquid level of the filter press residue slurry mixing tank, the operating current of the filter press pump and the outlet pressure transmitted by the pressure transmitter.

[0011] Preferably, agitators are installed in the filtrate storage tank and the filter residue slurry mixing tank respectively, and the control circuit of the agitator is connected to the control cabinet.

[0012] Preferably, the filtrate output end of each filter press is connected to a filtrate storage tank, respectively.

[0013] Preferably, the filtrate storage tank is connected to a filtrate delivery pump, and a control circuit of the filtrate delivery pump is connected to the control cabinet.

[0014] When the utility model is in operation, the control cabinet is provided with the pump cutting current, pump stopping current, pump cutting frequency, pump stopping frequency and pump stopping pressure of the filter press pump, the pump cutting current is greater than the pump stopping current, as well as the slurry mixing level, pump stopping level and stirring start-stop level of the filter press residue slurry mixing tank, the slurry mixing level> stirring start-stop level> pump stopping level;

[0015] When the system starts, the 1# filter press group starts working, the 1# filter press pump automatically runs, the 1# filter press starts filtering, the 1# filter press pump runs at a variable frequency and automatically tracks the target liquid level of the filtrate storage tank. As more and more filter residue accumulates in the 1# filter press, the liquid level of the filtrate storage tank rises accordingly, until the operating liquid level L of the filtrate storage tank ≥ the pump cut-off level, and the actual operating current i1 of the 1# filter press pump ≤ the pump cut-off current, and the actual operating frequency F1 ≥ the pump cut-off frequency, then the 1# filter press pump runs at the pump stop frequency. At the same time, the 2# filter press group is automatically started, the 2# filter press pump automatically runs, the 2# filter press starts filtering, the 2# filter press pump runs at a variable frequency and automatically tracks the target liquid level of the filtrate storage tank, thus completing the automatic start of the 2# filter press group and the system's filter pressure switching control;

[0016] When the actual operating current i1 of the 1# filter press pump running at the pump stop frequency is ≤ the pump stop current, and / or the actual outlet pressure P1 of the 1# filter press pump is ≥ the pump stop pressure, the 1# filter press pump stops running, and the 1# filter press stops filtering. At the same time, the system automatically starts the 1# filter press to unload the slag to the 1# filter press slag slurry mixing tank, the 1# filter press is finished unloading and compacted, the 1# filter press group is finished filtering, and the 1# filter press group stops working, waiting for the next filter press group working cycle;

[0017] As the accumulation of filter residue in the 2# filter press gradually increases, the liquid level of the filtrate storage tank to be pressed rises. When the actual operating liquid level L of the filtrate storage tank ≥ the pump cut-off level, and the actual operating current i2 of the 2# filter press pump ≤ the pump cut-off current, and / or the actual operating frequency F2 ≥ the pump cut-off frequency, the 2# filter press pump operates at the pump stop frequency, and the 3# filter press group is automatically started at the same time, the 3# filter press pump automatically runs, the 3# filter press starts filtering, the 3# filter press pump operates with variable frequency and automatically tracks the target liquid level of the filtrate storage tank to be pressed, that is, the automatic start of the 3# filter press group and the filter pressure switching control of the system are completed;

[0018] When the running current i2 of the 2# filter press pump running at the pump stop frequency is ≤ the pump stop current, and / or the outlet pressure P2 of the 2# filter press pump is ≥ the pump stop pressure, the 2# filter press pump stops running, and the 2# filter press stops filtering at the same time, and the 2# filter press is automatically started to unload the slag to the 2# filter press slag slurry mixing tank, the 2# filter press is finished unloading the slag and compacting, the 2# filter press group is finished filtering, and the 2# filter press group stops working, waiting for the next filter press group working cycle;

[0019] And so on, until the n# filter press pump and n# filter press are started to operate, and then the 1# filter press pump and 1# filter press are started again to start the next working cycle.

[0020] In this way, the utility model can automatically control multiple filter press groups by setting the target liquid level and pump cut-off level of the filter press liquid storage tank, the pump cut-off current, pump cut-off frequency, pump stop frequency, pump stop current of the filter press pump and the pump stop pressure on the filter press pipeline, the slurry mixing level, pump stop level and stirring start and stop level of the filter press residue slurry mixing tank, detecting the relevant parameters and introducing them into the control cabinet of the system, and each filter press group can be started, switched and stopped in a continuous cycle to realize the automatic operation of the filter press system.

[0021] To facilitate the slurry adjustment of the filter press residue, before each filter press unloads the residue, the corresponding filter press residue slurry adjustment tank is automatically replenished with liquid through a pneumatic or electric liquid inlet valve. When the liquid level of the corresponding filter press residue slurry adjustment tank is ≥ the stirring start and stop liquid level, the stirring of the filter press residue slurry adjustment tank is started; when the liquid level of the corresponding filter press residue slurry adjustment tank is ≥ the pump stop liquid level, the pneumatic or electric liquid inlet valve is automatically closed to stop the liquid replenishment.

[0022] Furthermore, after the slag unloading of each filter press is completed and the stirring and slurrying of the filter press slag in the corresponding filter press slag slurry mixing tank is completed, the corresponding filter press slag slurry pump is started, and when the liquid level of the corresponding filter press slurry mixing tank is ≤ the stirring start and stop liquid level, the stirring of the filter press slurry mixing tank is stopped; when the liquid level of the corresponding filter press slurry mixing tank is ≤ the pump stop liquid level, the operation of the corresponding filter press slurry pump is automatically stopped.

[0023] Furthermore, when a group of filter press pumps and filter presses fails, the control system automatically skips the failed filter press group according to the fault feedback signal and automatically starts the subsequent filter press groups to ensure continuous production.

[0024] Furthermore, the pump stop frequency is the maximum operating frequency of the filter press pump.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] 1. The utility model realizes the automatic start of the next group of filter press pumps and the corresponding filter presses by quantitatively controlling the filter press operation parameters of the filter liquid storage tank and the filter press pump to meet the conditions of the pump cutting level, pump cutting current and pump cutting frequency;

[0027] 2. The utility model realizes quantitative control of stopping the filter press pump and starting the corresponding filter press to unload the slag by pulling the plate according to whether the filter press operation parameters of the filter press pump meet the conditions of pump stop frequency, pump stop current and pump stop pressure;

[0028] 3. The filter presses of each filter press group automatically start to run, and after completing the plate pulling, slag unloading and compacting work, they are ready to enter the next cycle;

[0029] 4. According to the feedback of liquid level, current and pressure parameters during the filtration process, the entire filtration system can be fully automatically controlled and operated without manual intervention;

[0030] 5. The control system of the utility model has a high degree of intelligence and the system runs fully automatically, which greatly reduces labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a system process schematic diagram of automatic start-stop switching control of multiple filter press groups in wet smelting of the utility model.

[0033] Figure 2 The utility model is a flow chart of the automatic start-stop switching control method of multiple filter press groups in wet smelting. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] See also Figure 1 The utility model discloses a system for automatically starting and stopping multiple filter press groups in hydrometallurgy, which includes a filter press storage tank, multiple filter press groups, and a control cabinet. The outlet of the filter press storage tank is connected to multiple filter press groups in parallel, and each filter press group is numbered in the order of 1, 2, ... n (n is a natural number).

[0038] The control cabinet pre-stores the pump cut-off level and target level of the filter storage tank. The pump cut-off level is used to indicate the level of switching the filter press group. The target level indicates the normal working level of the filter press system. The filter storage tank is provided with a liquid inlet pipe for inputting the filter and a liquid level detection device for detecting the operating liquid level L of the filter storage tank. A control valve is provided on the liquid inlet pipe. In this embodiment, the liquid level detection device adopts a liquid level meter.

[0039] Each filter press group includes a filter press pump, a filter press, a filter press residue slurry mixing tank and a filter press residue slurry pump connected in sequence. The front-end control system of the filter press pump is equipped with a frequency converter so that the filter press pump works in a variable frequency state. A current detection device for detecting the operating current i of the filter press pump is installed on the control circuit of the filter press pump, and a pressure transmitter for detecting the output pressure is installed on the output pipeline of the filter press pump. The control cabinet is provided with the pump cut-off current, pump stop current, pump cut-off frequency, pump stop frequency, and pump stop pressure of the filter press pump, and the pump cut-off current> pump stop current. The filter press residue slurry mixing tank is provided with a liquid inlet pipe for liquid replenishment and a liquid level detection device (liquid level gauge) for detecting the liquid level of the filter press residue slurry mixing tank. The control cabinet is also provided with a slurry mixing liquid level for indicating the stop of liquid replenishment, a pump stop liquid level for indicating the stop of the filter press residue slurry pump, and a stirring start-stop liquid level for starting and stopping stirring, and the slurry mixing liquid level> stirring start-stop liquid level> pump stop liquid level.

[0040] Agitators are respectively installed in the filtrate storage tank and the filter residue slurry mixing tank to facilitate stirring of the filtrate or the filter residue.

[0041] The filtrate output ends of the filter presses of each filter press group are respectively connected to the filtrate storage tank to achieve centralized treatment of the filtrate.

[0042] The filtrate storage tank is connected to a filtrate delivery pump to facilitate output of the filtrate in the filtrate storage tank through the filtrate delivery pump.

[0043] The stirring motors, liquid level detection devices, current detection devices, pressure transmitters and control valves of each of the filter press pumps, filter presses, filter press slurry pumps and filter press slurry mixing tanks are respectively connected to the control cabinet, and the control cabinet controls the start, stop and switching of the stirring motors and control valves of each of the filter press pumps, filter presses, filter press slurry pumps and filter press slurry mixing tanks.

[0044] like Figure 2As shown, when the system of automatic start-stop switching control of multiple filter press groups in the wet smelting of the utility model is started, the 1# filter press group is started, the 1# filter press pump automatically runs, the 1# filter press starts filtering, the 1# filter press pump operates with variable frequency and automatically tracks (PID) the target liquid level of the filter press liquid storage tank, as more and more filter residue accumulates in the 1# filter press, the liquid level of the filter press liquid storage tank rises, until the operating liquid level L of the filter press liquid storage tank ≥ the pump cut-off level, and the operating current i1 of the 1# filter press pump ≤ the pump cut-off current, and the operating frequency F1 ≥ the pump cut-off frequency, then the 1# filter press pump operates at the pump stop frequency (generally the maximum frequency, which can be set);

[0045] At the same time, the control system automatically starts the 2# filter press group, the 2# filter press pump automatically runs, the 2# filter press starts filtering, the 2# filter press pump operates with variable frequency and automatically tracks (PID) the target liquid level of the filtrate storage tank to be filtered, thus completing the automatic start-up of the 2# filter press group and the automatic switching control of the filter press group;

[0046] When the control system detects that the operating current i1 of the 1# filter press pump running at the pump stop frequency is ≤ the pump stop current, and (or) the outlet pressure P1 of the 1# filter press pump is ≥ the pump stop pressure, the 1# filter press pump stops running, the 1# filter press stops filtering, and the control system automatically starts the 1# filter press to unload the slag to the 1# filter press slag slurry mixing tank. After the 1# filter press has finished unloading the slag and compacted it, the 1# filter press group's filtering work is completed, and the 1# filter press group stops working, waiting for the next filter press group working cycle;

[0047] As the accumulation of filter residue in the 2# filter press gradually increases, the liquid level of the filtrate storage tank rises, and the liquid level L of the filtrate storage tank ≥ the pump cut-off level, and the operating current i2 of the 2# filter press pump ≤ the pump cut-off current, and the operating frequency F2 ≥ the pump cut-off frequency, then the 2# filter press pump runs at the pump stop frequency (generally the maximum frequency, which can be set); at the same time, the 3# filter press group is started, and so on, until the n# filter press group is started, the n# filter press pump and the n# filter press are running, and then the 1# filter press group is started again to start the next working cycle;

[0048] When the running current i2 of the 2# filter press pump running at the pump stop frequency is less than or equal to the pump stop current, and (or) the outlet pressure P2 of the 2# filter press pump is greater than or equal to the pump stop pressure, the 2# filter press pump stops running, and the 2# filter press stops filtering, the control system automatically starts the 2# filter press to unload the slag to the 2# filter press slag mixing tank, and after the 2# filter press has completed unloading and compacted the slag, it waits for the next filter pressing cycle, and so on;

[0049] In this way, each filter press pump and the corresponding filter press are started and stopped in a continuous cycle to achieve automatic operation and continuous production.

[0050] In addition, before the filter press pulls the plate to unload the slag, the filter press slag slurry mixing tank can be automatically replenished with liquid through a pneumatic or electric liquid inlet valve. When the actual liquid level of the corresponding filter press slag slurry mixing tank is ≥ the stirring start-stop liquid level, the stirring of the filter press slag slurry mixing tank is started; when the actual liquid level of the corresponding filter press slag slurry mixing tank is ≥ the slurry mixing liquid level, the pneumatic or electric liquid inlet valve is automatically closed to stop replenishing the liquid; after waiting for the stirring and slurrying of the filter press slag in the filter press slurry mixing tank to be completed, the control system starts the filter press slag slurry pump to output the filter press slurry mixing slag. When the actual liquid level of the corresponding filter press slag slurry mixing tank is ≤ the stirring start-stop liquid level, the stirring of the filter press slag slurry mixing tank is stopped; when the liquid level of the corresponding filter press slag slurry mixing tank is ≤ the pump stop liquid level, the operation of the corresponding filter press slag slurry pump is automatically stopped, and the next liquid replenishment is started.

[0051] When a group of filter press pumps and filter presses fails, the control system can automatically skip the faulty filter press group and automatically start the subsequent filter press groups according to the set fault feedback signal.

[0052] The target liquid level, pump cutting level, pump cutting current, pump cutting frequency, pump stopping frequency, pump stopping current and pump stopping pressure, slurry adjustment level and pump stopping level involved in the automatic start and stop switching control method of multiple filter press groups in wet smelting of the utility model are all settable parameters in the control system and can be flexibly adjusted according to actual operating conditions.

[0053] The above is only a specific implementation scheme of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the field can make many possible changes and modifications to the technical scheme of the utility model by using the technical content disclosed above without departing from the scope of the technical scheme of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical scheme of the utility model shall fall within the protection scope of the technical scheme of the utility model.

Claims

1. A system for automatically starting and stopping multiple filter press groups, comprising a filter press storage tank and multiple filter press groups, wherein the filter press storage tank is connected in parallel to multiple filter press groups, and each filter press group comprises a filter press pump, a filter press, a filter press residue slurry tank, and a filter press residue slurry pump connected in sequence, characterized in that: The system also includes a control cabinet, a frequency converter is installed at the front end of each filter press pump, the filter press pump and the filter press slurry pump are respectively connected to the control cabinet, and under the control of the control cabinet, each filter press group automatically starts and stops and switches to cyclic operation.

2. The system for automatic start-stop switching control of multiple filter press groups according to claim 1 is characterized in that: A liquid inlet pipe and a liquid level detection device are respectively arranged in each of the filtrate storage tanks and the filter press residue slurry mixing tank, a control valve is respectively installed on each of the liquid inlet pipes, a current detection device is installed on the control circuit of each of the filter press pumps, and each of the liquid level detection device, control valve and current detection device is respectively connected to the control cabinet.

3. The system for automatic start-stop switching control of multiple filter press groups according to claim 2, characterized in that: The filter press liquid storage tank is provided with a pump cut-off level for indicating the switching of the filter press group and a target level for indicating that the filter press group is in a normal working state. A pressure transmitter is provided on the output pipeline of the filter press pump. The filter press residue slurry adjustment tank is provided with a slurry adjustment level, a pump stop level and a stirring start-stop level, and the slurry adjustment level is higher than the stirring start-stop level and higher than the pump stop level. The liquid level detection device of the filter press liquid storage tank detects the actual liquid level of the filter press liquid storage tank and transmits it to the control cabinet. The liquid level detection device of the filter press residue slurry adjustment tank detects the actual liquid level of the filter press residue slurry adjustment tank. The control cabinet detects the operating current of the filter press pump and transmits it to the control cabinet, and the control cabinet controls the start, stop and switch of the filter press pump, the filter press, the filter press residue mixing tank and the filter press residue slurry pump in real time according to the actual liquid level of the filtrate storage tank to be pressed, the actual liquid level of the filter press residue slurry mixing tank, the operating current of the filter press pump and the outlet pressure transmitted by the pressure transmitter.

4. The system for automatic start-stop switching control of multiple filter press groups according to claim 1, characterized in that: Agitators are respectively installed in the filtrate storage tank and the filter residue slurry mixing tank, and the control circuit of the agitator is connected to the control cabinet.

5. The system for automatic start-stop switching control of multiple filter press groups according to claim 1, characterized in that: The filtrate output ends of the filter presses are respectively connected to filtrate storage tanks.

6. The system for automatic start-stop switching control of multiple filter press groups according to claim 5, characterized in that: The filtrate storage tank is connected to a filtrate delivery pump, and a control circuit of the filtrate delivery pump is connected to the control cabinet.

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