Automatic feeding control system of hydrochloric acid conveying device

Abstract

The utility model relates to an automatic feeding control system of a hydrochloric acid conveying device, and relates to the field of automatic feeding control, the automatic feeding control system comprises a storage tank, a hydrochloric acid barrel and a switch control module, the storage tank and the hydrochloric acid barrel are communicated through a conveying pipe, a first electromagnetic valve is installed at the position, close to the storage tank, of the conveying pipe, and a second electromagnetic valve is installed at the position, close to the hydrochloric acid barrel, of the conveying pipe. A first detection module is mounted in the hydrochloric acid barrel, an upper limit and a lower limit are preset in the first detection module, and when the liquid level in the hydrochloric acid barrel is lower than the lower limit, the first detection module outputs a control signal to the switch control module; and when the liquid level rises to the upper limit, the first detection module stops outputting. The switch control module is electrically connected with the first electromagnetic valve and the second electromagnetic valve, when the switch control module receives the control signal, the first electromagnetic valve and the second electromagnetic valve are controlled to be switched on, and when the liquid level detection module stops outputting, the first electromagnetic valve and the second electromagnetic valve are controlled to be switched off. The hydrochloric acid barrel feeding device has the effect that hydrochloric acid barrel feeding is more convenient.

Description

Technical Field

[0001] The present application relates to the field of automatic feeding, and in particular to an automatic feeding control system of a hydrochloric acid conveying device. Background Art

[0002] Industrial hydrochloric acid is an important chemical raw material and is widely used in various industries. Hydrochloric acid is an aqueous solution of hydrogen chloride. It is a monobasic inorganic strong acid with a wide range of industrial uses. In the chemical industry, hydrochloric acid has many important applications and plays a decisive role in the quality of products. Hydrochloric acid is a chemical reagent required for the large-scale preparation of many inorganic and organic compounds, such as polystyrene, the precursor of PVC plastics.

[0003] In the process of preparing polystyrene, hydrochloric acid needs to be added. At present, a hydrochloric acid barrel for placing hydrochloric acid is provided on one side of the reactor. The hydrochloric acid barrel is connected to the reactor to add hydrochloric acid to the materials in the reactor to keep the pH value of the materials within the set range. The hydrochloric acid delivery device also includes a storage tank, which is used to store the purchased hydrochloric acid. A delivery pipe is connected between the storage tank and the hydrochloric acid barrel. A first valve is installed near the storage tank, and a second valve is installed near the hydrochloric acid barrel. When the amount of hydrochloric acid in the hydrochloric acid barrel is small, the first valve and the second valve are closed, and the delivery pump is turned on at the same time, and the storage tank delivers hydrochloric acid to the hydrochloric acid barrel through the delivery pipe.

[0004] With regard to the above-mentioned related technologies, the storage tank is generally far away from the hydrochloric acid barrel, and two people are required to cooperate in closing the first valve and the second valve. When person A closes the second valve near the hydrochloric acid barrel, person A is not clear about the information of person B at the position of the first valve, so that person A cannot accurately contact person B, making the loading process of the hydrochloric acid barrel cumbersome, which may delay the loading of the hydrochloric acid barrel and affect the preparation of polystyrene. Utility Model Content

[0005] In order to make loading of hydrochloric acid barrels more convenient, the present application provides an automatic loading control system for a hydrochloric acid conveying device.

[0006] The automatic feeding control system of a hydrochloric acid conveying device provided in the present application adopts the following technical solution:

[0007] An automatic feeding control system for a hydrochloric acid conveying device, comprising a storage tank, a hydrochloric acid barrel and a switch control module, wherein the storage tank and the hydrochloric acid barrel are connected through a conveying pipe, a first solenoid valve is installed near the storage tank, and a second solenoid valve is installed near the hydrochloric acid barrel;

[0008] A first detection module is installed in the hydrochloric acid barrel. The first detection module is preset with an upper limit and a lower limit. When the liquid level in the hydrochloric acid barrel is lower than the lower limit, the first detection module outputs a control signal to the switch control module; when the liquid level rises to between the upper limit and the lower limit, the first detection module continuously outputs a control signal to the switch control module; the first solenoid valve and the second solenoid valve are continuously connected; when the liquid level rises to the upper limit, the liquid level detection module stops outputting;

[0009] The switch control module is electrically connected to the first solenoid valve and the second solenoid valve; when the switch control module receives a control signal, it controls the first solenoid valve and the second solenoid valve to be connected, and the liquid in the storage tank flows into the hydrochloric acid barrel through the delivery pipe; when the liquid level rises to between the upper limit and the lower limit, the first solenoid valve and the second solenoid valve are continuously connected; when the liquid level rises to the upper limit, the switch control module controls the first solenoid valve and the second solenoid valve to be turned off.

[0010] By adopting the above technical solution, when the liquid level in the hydrochloric acid barrel is lower than the lower limit, the second solenoid valve and the first solenoid valve are connected, and the hydrochloric acid in the storage tank is transported to the hydrochloric acid barrel through the delivery pipe. When the liquid level rises to between the upper limit and the lower limit, the hydrochloric acid is continuously transported. When the liquid level rises to the upper limit, the second solenoid valve and the first solenoid valve are turned off, and the transportation is stopped. The automatic feeding system realizes automatic control of the hydrochloric acid barrel feeding, saves labor costs, and makes the hydrochloric acid barrel feeding process simpler and more convenient.

[0011] Optionally, the first detection module includes a lower float switch T1, one end of the lower float switch T1 is electrically connected to the power supply VCC, and the other end is electrically connected to the relay coil KA1, and the lower float switch T1 is connected in parallel with the relay contact KA1-1; one end of the relay coil KA1 is electrically connected to the lower float switch T1, and the other end is electrically connected to the upper float switch T2; one end of the upper float switch T2 is electrically connected to the relay coil KA1, and the other end is connected to the switch control module, and outputs a control signal to the switch control module.

[0012] By adopting the above technical solution, the lower float switch T1, the relay coil KA1 and the relay contact KA1-1 form a self-locking circuit, ensuring that when the liquid level in the hydrochloric acid barrel rises to between the upper limit and the lower limit, the first solenoid valve and the second solenoid valve are in a continuously conductive state, and the hydrochloric acid in the storage tank can continue to enter the hydrochloric acid barrel until the liquid level in the hydrochloric acid barrel rises to the upper limit.

[0013] Optionally, it also includes a reserved joint for connecting to a feeding vehicle, the storage tank, the hydrochloric acid barrel and the reserved joint are connected through a delivery pipe, a third solenoid valve is installed at a position of the delivery pipe near the reserved joint, and the switch control module includes a logic control circuit, the logic control circuit includes a manual switch S1, and the manual switch S1 is electrically connected to the third solenoid valve; when the manual switch S1 is closed, the third solenoid valve is turned on, and when the manual switch S1 is disconnected, the third solenoid valve is turned off.

[0014] By adopting the above technical solution, the feeding cart is connected to the reserved joint, and the first solenoid valve and the third solenoid valve are turned on at the same time, so that the hydrochloric acid in the feeding cart can be transported to the storage tank for storage, thereby realizing the function of loading the storage tank.

[0015] Optionally, one end of the manual switch S1 is electrically connected to the power supply VCC, and the other end is electrically connected to the third solenoid valve, and the end of the manual switch S1 away from the power supply VCC is electrically connected to the NOT gate E1 and the AND gate E2, one input end of the NOT gate E1 is electrically connected to the manual switch S1, and the other input end is electrically connected to the power supply VCC, and the output end of the NOT gate E1 outputs a shutdown signal; one input end of the AND gate E2 is electrically connected to the manual switch S1, and the other input end is electrically connected to the power supply VCC, and the output end of the AND gate E2 outputs a conduction signal.

[0016] By adopting the above technical solution, the feeding system is controlled by the state of the manual switch S1 to select whether to feed the hydrochloric acid barrel or the storage tank. When the manual switch S1 is closed, the first solenoid valve and the third solenoid valve are automatically connected. When the manual switch S1 is disconnected, the third solenoid valve is automatically closed to prepare for the connection of the first solenoid valve and the second solenoid valve.

[0017] Optionally, the switch control module also includes a logic circuit, which is connected to the detection module to receive a control signal and is also connected to the logic control circuit to receive a shutdown signal and a conduction signal. When the logic circuit receives the control signal and the shutdown signal at the same time, it controls the first solenoid valve to be connected to the second solenoid valve; when the logic circuit receives the conduction signal, it controls the first solenoid valve to be connected to the third solenoid valve.

[0018] By adopting the above technical solution, the first solenoid valve and the second solenoid valve can be connected only when the liquid level of the hydrochloric acid barrel is low and the third solenoid valve is in the off state. If the first solenoid valve and the second solenoid valve are connected, and the third solenoid valve is also in the on state, the liquid in the storage tank will flow out from the reserved joint, and the automatic loading of the hydrochloric acid barrel cannot be realized.

[0019] Optionally, the logic circuit includes an AND gate E3, one input end of the AND gate E3 is connected to the first detection module to receive a control signal, and the other input end is connected to the output end of the NOT gate E1 to receive a shutdown signal; the output end of the AND gate E3 is electrically connected to the second solenoid valve, and the output end of the AND gate E3 and the other input end are electrically connected to an AND gate E4, one input end of the AND gate E4 is connected to the output end of the AND gate E3, and the other input end is connected to the input end of the AND gate E3 connected to the first detection module, and the output end of the AND gate E4 is electrically connected to an OR gate E5, one input end of the OR gate E5 is electrically connected to the output end of the AND gate E2, and the other input end is electrically connected to the output end of the AND gate E4, and the output end of the OR gate E5 is electrically connected to the first solenoid valve.

[0020] By adopting the above technical solution, when the third solenoid valve is in the off state and the liquid level in the hydrochloric acid barrel is lower than the lower limit, the first solenoid valve and the second solenoid valve are turned on in sequence through the logic circuit, and the first solenoid valve and the second solenoid valve are automatically controlled through the logic circuit composed of an AND gate and an OR gate.

[0021] Optionally, the delivery pipe is provided with a delivery pump, which is used to transport the hydrochloric acid in the delivery pipe; the switch control module also includes a motor commutation circuit, and the motor of the delivery pump is electrically connected to the motor commutation circuit; when the first solenoid valve and the second solenoid valve are turned on at the same time, the motor commutation circuit controls the motor of the delivery pump to rotate forward, and when the first solenoid valve and the third solenoid valve are turned on at the same time, the motor commutation circuit controls the motor of the delivery pump to rotate reversely.

[0022] By adopting the above technical solution, the delivery pump provides power for the delivery of hydrochloric acid in the delivery pipe, making the delivery process smoother. Since the system can realize both the loading and unloading of the storage tank, there is only one delivery pump in these two delivery states. At this time, it is necessary to cooperate through the forward and reverse rotation of the motor to ensure that the hydrochloric acid is delivered normally.

[0023] Optionally, the output end of the AND gate E4 is electrically connected to a relay coil KA2, and the two ends of the relay coil KA2 are electrically connected to the AND gate E4 and the OR gate E5 respectively; the output end of the AND gate E2 is electrically connected to a relay coil KA3, and the two ends of the relay coil KA3 are electrically connected to the AND gate E2 and the OR gate E5 respectively; the motor commutation circuit includes a relay contact KA2-1 and a relay contact KA3-1, the relay contact KA2-1 is forwardly connected to the three-phase electricity of the motor, and the relay contact KA3-1 is reversely connected to the three-phase electricity of the motor.

[0024] By adopting the above technical solution, the system uses two relays to realize the forward and reverse rotation of the motor. When the third solenoid valve is turned off and the first solenoid valve is connected to the second solenoid valve, the relay coil KA2 is energized and the relay contact KA2-1 is closed to realize the forward rotation of the motor; when the third solenoid valve is turned on and the first solenoid valve is also turned on, the relay coil KA3 is energized and the relay contact KA3-1 is closed to realize the reverse rotation of the motor. The system realizes the control of the motor while controlling the three solenoid valves, so that the system will not have the phenomenon of the conveying pipe being shut down during the operation of the motor, and reduces the possibility of the hydraulic pressure in the conveying pipe rising due to the motor not being shut down in time.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The system can automatically perform feeding operations according to the changes in the liquid level in the hydrochloric acid barrel. When the liquid level is lower than the lower limit, the system will automatically start the delivery of hydrochloric acid. When the liquid level reaches the upper limit, the system will automatically stop the delivery, realizing automatic control of the hydrochloric acid barrel feeding process. Through the automated control system, manual intervention can be reduced, labor costs can be reduced, and the workload of operators can be reduced while ensuring production efficiency;

[0027] 2. The system can also select the loading object of the hydrochloric acid barrel or storage tank by the state of the manual switch S1, so as to meet the loading needs in different situations and improve the flexibility and applicability of the operation;

[0028] 3. The system is equipped with a motor reversing circuit and a delivery pump, which can realize automatic control of the forward and reverse rotation of the delivery pump, ensure the smooth delivery of hydrochloric acid, and avoid the increase of hydraulic pressure in the delivery pipe, thereby improving the safety and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a system block diagram of an automatic feeding control system of a hydrochloric acid conveying device in an embodiment of the present application.

[0030] Figure 2 It is a circuit diagram of the first detection module of an embodiment of the present application.

[0031] Figure 3 It is a module block diagram of the switch control module of an embodiment of the present application.

[0032] Figure 4 It is a circuit diagram of the logic circuit and the logic control circuit of the embodiment of the present application.

[0033] Figure 5 Schematic diagram of a motor steering circuit according to an embodiment of the present application.

[0034] Figure 6 It is a module block diagram of the second detection module of an embodiment of the present application.

[0035] Figure 7 It is a module block diagram highlighting the comparison unit and the detection control module in the embodiment of the present application.

[0036] Explanation of the accompanying drawings: 1. Storage tank; 11. First solenoid valve; 2. Hydrochloric acid barrel; 21. Second solenoid valve; 22. First detection module; 3. Switch control module; 31. Logic circuit; 32. Logic control circuit; 33. Motor commutation circuit; 4. Reserved connector; 41. Third solenoid valve; 5. Delivery pump; 51. Motor; 6. Second detection module; 61. Detection unit; 62. Comparison unit; 621. First comparator; 622. Second comparator; 7. Detection control module. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-7 It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] The present application embodiment discloses an automatic feeding control system for a hydrochloric acid conveying device. Figure 1 An automatic feeding control system for a hydrochloric acid delivery device includes a storage tank 1, a hydrochloric acid barrel 2, a reserved joint 4 and a switch control module 3. The storage tank 1, the hydrochloric acid barrel 2 and the reserved joint 4 are connected through a delivery pipe. The reserved joint 4 is used to be connected to a feeding vehicle. A first solenoid valve 11 is installed near the storage tank 1 of the delivery pipe, a second solenoid valve 21 is installed near the hydrochloric acid barrel 2, and a third solenoid valve 41 is installed near the reserved joint 4. The delivery pipe is provided with a delivery pump 5, which is used to deliver the hydrochloric acid in the delivery pipe. The switch control module 3 is electrically connected to the first solenoid valve 11, the second solenoid valve 21, the third solenoid valve 41 and the motor 51 of the delivery pump 5. The first detection module 22 is installed in the hydrochloric acid barrel 2. When the first detection module 22 detects that the liquid level in the hydrochloric acid barrel 2 is low, the switch control module 3 controls the first solenoid valve 11 and the second solenoid valve 21 to be turned on, and at the same time controls the motor 51 of the delivery pump 5 to rotate forward, and the hydrochloric acid in the storage tank 1 is delivered to the hydrochloric acid barrel 2, so as to realize the loading of the hydrochloric acid barrel 2. When the first detection module 22 detects that the liquid level in the hydrochloric acid barrel 2 is high, the switch control module 3 controls the first solenoid valve 11 and the second solenoid valve 21 to be turned off, and stops the delivery. When the hydrochloric acid of the feeding vehicle needs to be stored in the storage tank 1, the switch control module 3 controls the first solenoid valve 11 and the second solenoid valve 21 to be turned on, and at the same time controls the motor 51 of the delivery pump 5 to reverse, so as to realize the storage of hydrochloric acid.

[0039] Reference Figure 2 The first detection module 22 includes a lower float switch T1, one end of which is electrically connected to the power supply VCC, and the other end is electrically connected to the relay coil KA1, and the lower float switch T1 is connected in parallel with the relay contact KA1-1. One end of the relay coil KA1 is electrically connected to the lower float switch T1, and the other end is electrically connected to the upper float switch T2. One end of the upper float switch T2 is electrically connected to the relay coil KA1, and the other end is electrically connected to the switch control module 3, and outputs a control signal to the switch control module 3.

[0040] The lower float switch T1 is preset with a lower limit, and the upper float switch T2 is preset with an upper limit. When the liquid level in the hydrochloric acid barrel 2 is lower than the lower limit, the lower float switch T1 and the upper float switch T2 are both in a closed state, the relay coil KA1 is energized, the relay contact KA1-1 is closed, and the first detection module 22 outputs a control signal to the switch control module 3. When the liquid level rises to between the upper limit and the lower limit, the lower float switch T1 is disconnected, and the upper float switch T2 is still in a closed state. At this time, the relay coil KA1 is self-locked and energized, and the first detection module 22 continues to output a control signal to the switch control module 3. When the liquid level rises to the upper limit, the lower float switch T1 and the upper float switch T2 are both in an open state, the relay coil KA1 loses power, the relay contact KA1-1 is disconnected, and the liquid level detection module stops outputting.

[0041] Reference Figure 3 and Figure 4 , the switch control module 3 includes a logic control circuit 32, a logic circuit 31 and a motor commutation circuit 33, the logic control circuit 32 includes a manual switch S1, one end of the manual switch S1 is electrically connected to the power supply VCC, and the other end is electrically connected to the third electromagnetic valve 41, the end of the manual switch S1 away from the power supply VCC is electrically connected to the NOT gate E1 and the AND gate E2, one input end of the NOT gate E1 is electrically connected to the manual switch S1, the other input end is electrically connected to the resistor R2, the other end of the resistor R2 is electrically connected to the power supply VCC, and the output end of the NOT gate E1 outputs a shutdown signal; one input end of the AND gate E2 is electrically connected to the manual switch S1, the other end is electrically connected to the resistor R1, the other end of the resistor R1 is electrically connected to the power supply VCC, and the output end of the AND gate E2 outputs a conduction signal. When the manual switch S1 is closed, the third electromagnetic valve 41 receives a high level to conduct, and the AND gate E2 outputs a conduction signal; when the manual switch S1 is disconnected, the third electromagnetic valve 41 receives a low level to shut down, and the NOT gate E1 outputs a shutdown signal.

[0042] Reference Figure 4 The logic circuit 31 includes an AND gate E3, one input end of the AND gate E3 is electrically connected to the manual switch S2, one end of the manual switch S2 is electrically connected to the AND gate E3, and the other end is connected to the first detection module 22, the control signal is transmitted to the AND gate E3 through the manual switch S2, and the other input end of the AND gate E3 is connected to the output end of the NOT gate E1 to receive the shutdown signal; the output end of the AND gate E3 is electrically connected to the second solenoid valve 21, and the output end of the AND gate E3 and the other input end are electrically connected to the AND gate E4, one input end of the AND gate E4 is connected to the output end of the AND gate E3, and the other input end is connected to the end of the manual switch S2 close to the AND gate E3, and the output end of the AND gate E4 is electrically connected to the OR gate E5, one input end of the OR gate E5 is electrically connected to the output end of the AND gate E2, and the other input end is electrically connected to the output end of the AND gate E4, and the output end of the OR gate E5 is electrically connected to the first solenoid valve 11.

[0043] When the manual switch S1 is disconnected, the third solenoid valve 41 is turned off, and the NOT gate E1 outputs a shutdown signal. When the AND gate E3 receives the control signal and the shutdown signal at the same time, the AND gate E3 outputs a high level, the second solenoid valve 21 receives the high level and turns on, and at the same time, the AND gate E4 outputs a high level, and one input end of the OR gate E5 receives a high level and outputs a high level, and the first solenoid valve 11 receives a high level and turns on. When the manual switch S1 is closed, the third solenoid valve 41 is turned on, the AND gate E2 outputs a high level, and one input end of the OR gate E5 receives a high level and outputs a high level, and the first solenoid valve 11 receives a high level and turns on.

[0044] When neither feeding nor storage is needed, the manual switch S1 is in the off state, and when the liquid level in the hydrochloric acid barrel 2 is low, feeding is automatically performed. When an emergency occurs in the feeding device, the staff manually disconnects the manual switch S2 to stop feeding.

[0045] Reference Figure 4 The output end of the AND gate E4 is electrically connected to a relay coil KA2, and the two ends of the relay coil KA2 are electrically connected to the AND gate E4 and the OR gate E5 respectively. The output end of the AND gate E2 is electrically connected to a relay coil KA3, and the two ends of the relay coil KA3 are electrically connected to the AND gate E2 and the OR gate E5 respectively.

[0046] Reference Figure 5 The motor commutation circuit 33 includes three relay contacts KA2-1 and three relay contacts KA3-1, and the three-phase electricity of the motor 51 is defined as L1, L2 and L3 respectively. L1, L2 and L3 are respectively connected to a relay contact KA2-1, and the other end of the relay contact KA2-1 is connected to the motor 51. The relay contact KA2-1 connected to L1 is connected to L3 through a relay contact KA3-1 at one end close to the motor 51; the relay contact KA2-1 connected to L2 is connected to L2 through a relay contact KA3-1 at one end close to the motor 51; the relay contact KA2-1 connected to L3 is connected to L1 through a relay contact KA3-1 at one end close to the motor 51.

[0047] When the AND gate E4 outputs a high level, the relay coil KA2 is energized, the relay contact KA2-1 is closed, and the motor 51 rotates forward; when the AND gate E2 outputs a high level, the relay coil KA3 is energized, the relay contact KA3-1 is closed, and the motor 51 rotates reversely.

[0048] Further, see Figure 1 and Figure 6, a second detection module 6 is installed in the storage tank 1, and two second detection modules 6 are provided to prevent one of the second detection modules 6 from failing and causing safety problems, thereby improving the reliability of the system. Each second detection module 6 includes a detection unit 61 and a comparison unit 62. The detection unit 61 includes a liquid level gauge, and the liquid level gauge is preferably a submersible static pressure liquid level gauge. The submersible static pressure liquid level gauge has a display screen that can display the current liquid level in real time. The liquid level gauge detects the liquid level in the storage tank 1 and outputs the liquid level to the comparison unit 62. The comparison unit 62 includes a first comparator 621 and a second comparator 622. The first comparator 621 and the second comparator 622 both receive the liquid level. The first comparator 621 is preset with an upper limit level, and the second comparator 622 is preset with a lower limit level. When the liquid level is greater than the upper limit level, the first comparator 621 outputs a high liquid level signal, and when the liquid level is less than the lower limit level, the second comparator 622 outputs a low liquid level signal.

[0049] Reference Figure 1 and Figure 7 The two second detection modules 6 are both electrically connected to the detection control module 7, which includes an AND gate E6 and an AND gate E7. The output ends of the two first comparators 621 are electrically connected to the two input ends of the AND gate E6, and the output end of the AND gate E6 is electrically connected to the relay coil KA4, one end of the relay coil KA4 is connected to the AND gate E6, and the other end is electrically connected to the resistor R3, and the other end of the resistor R3 is grounded. The output ends of the two second comparators 622 are electrically connected to the two input ends of the AND gate E7, and the output end of the AND gate E7 is electrically connected to the relay coil KA5, one end of the relay coil KA5 is connected to the AND gate E7, and the other end is electrically connected to the resistor R4, and the other end of the resistor R4 is grounded.

[0050] Reference Figure 4 The end of the manual switch S1 away from the power supply VCC is electrically connected to the relay normally closed contact KA4-1, one end of the relay normally closed contact KA4-1 is electrically connected to the manual switch S1, and the other end is electrically connected to the NOT gate E1 and the AND gate E2. The end of the manual switch S2 away from the first detection module is electrically connected to the relay normally closed contact KA5-1, one end of the relay normally closed contact KA5-1 is electrically connected to the manual switch S2, and the other end is electrically connected to the AND gate E3 and the AND gate E4.

[0051] When feeding the storage tank 1, the two liquid level gauges in the storage tank 1 continuously monitor the liquid level. When the liquid level is greater than the upper limit, the first comparator outputs a high liquid level signal. When the detection control module 7 receives a high liquid level signal output by any of the first comparators, the relay coil KA4 is energized, the relay normally closed contact KA4-1 is disconnected, the third solenoid valve is turned off, and the hydrochloric acid is stopped from being input from the reserved joint 4 to the storage tank 1. When feeding the hydrochloric acid barrel 2 from the storage tank 1, the two liquid level gauges in the storage tank 1 continuously monitor the liquid level. When the liquid level is less than the lower limit, the second comparator outputs a low liquid level signal. When the detection control module 7 receives a low liquid level signal output by any of the second comparators, the relay coil KA5 is energized, the relay normally closed contact KA5-1 is disconnected, the second solenoid valve is turned off, and the hydrochloric acid is stopped from being input from the storage tank 1 to the hydrochloric acid barrel 2.

[0052] The implementation principle of the automatic feeding control system of a hydrochloric acid conveying device of the present application embodiment is as follows: when neither feeding nor storage is needed at ordinary times, the manual switch S1 is in the disconnected state. When the hydrochloric acid in the feeding vehicle needs to be transported to the storage tank 1 through the reserved joint 4, when the manual switch S1 is closed, the third solenoid valve 41 is turned on, and at the same time, the first solenoid valve 11 is turned on, and the motor 51 is reversed, and the hydrochloric acid in the feeding vehicle is transported to the storage tank 1 through the reserved joint 4. When S1 is in the disconnected state, when the liquid level in the hydrochloric acid barrel 2 is lower than the lower limit, the third solenoid valve 41 is turned off, the second solenoid valve 21 and the first solenoid valve 11 are turned on, and the motor 51 rotates forward to transport the hydrochloric acid in the storage tank 1 to the hydrochloric acid barrel 2. When the liquid level rises to between the upper limit and the lower limit, the hydrochloric acid is continuously transported. When the liquid level rises to the upper limit, the second solenoid valve 21 and the first solenoid valve 11 are turned off, the motor 51 loses power, stops running, and the hydrochloric acid stops being transported, realizing the automatic feeding of the hydrochloric acid barrel 2.

[0053] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any feature disclosed in this specification (including the abstract and drawings), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

Claims

1. An automatic feeding control system for a hydrochloric acid conveying device, characterized in that: The invention comprises a material storage tank (1), a hydrochloric acid barrel (2) and a switch control module (3); the material storage tank (1) and the hydrochloric acid barrel (2) are connected via a delivery pipe; a first solenoid valve (11) is installed at a position of the delivery pipe close to the material storage tank (1), and a second solenoid valve (21) is installed at a position of the delivery pipe close to the hydrochloric acid barrel (2); A first detection module (22) is installed in the hydrochloric acid barrel (2), and the first detection module (22) is preset with an upper limit and a lower limit. When the liquid level in the hydrochloric acid barrel (2) is lower than the lower limit, the first detection module (22) outputs a control signal to the switch control module (3); when the liquid level rises to between the upper limit and the lower limit, the first detection module (22) continuously outputs a control signal to the switch control module (3); when the liquid level rises to the upper limit, the first detection module (22) stops outputting; The switch control module (3) is electrically connected to the first solenoid valve (11) and the second solenoid valve (21); when the switch control module (3) receives a control signal, it controls the first solenoid valve (11) and the second solenoid valve (21) to be connected, and the liquid in the storage tank (1) flows into the hydrochloric acid barrel (2) through the delivery pipe; when the liquid level rises to between the upper limit and the lower limit, the first solenoid valve (11) and the second solenoid valve (21) are continuously connected; when the liquid level rises to the upper limit, the switch control module (3) controls the first solenoid valve (11) and the second solenoid valve (21) to be closed.

2. The automatic feeding control system of a hydrochloric acid conveying device according to claim 1 is characterized in that: The first detection module (22) comprises a lower float switch T1, one end of the lower float switch T1 is electrically connected to a power supply VCC, and the other end is electrically connected to a relay coil KA1, and the lower float switch T1 is connected in parallel with a relay contact KA1-1; one end of the relay coil KA1 is electrically connected to the lower float switch T1, and the other end is electrically connected to an upper float switch T2; one end of the upper float switch T2 is electrically connected to the relay coil KA1, and the other end is connected to a switch control module (3), and outputs a control signal to the switch control module (3).

3. The automatic feeding control system of a hydrochloric acid conveying device according to claim 1 is characterized in that: The invention also comprises a reserved joint (4) for connecting to a feeding vehicle, the material storage tank (1), the hydrochloric acid barrel (2) and the reserved joint (4) are connected via a delivery pipe, a third solenoid valve (41) is installed at a position of the delivery pipe close to the reserved joint (4), the switch control module (3) comprises a logic control circuit (32), the logic control circuit (32) comprises a manual switch S1, and the manual switch S1 is electrically connected to the third solenoid valve (41); when the manual switch S1 is closed, the third solenoid valve (41) is turned on, and when the manual switch S1 is opened, the third solenoid valve (41) is turned off.

4. The automatic feeding control system of a hydrochloric acid conveying device according to claim 3 is characterized in that: One end of the manual switch S1 is electrically connected to a power supply VCC, and the other end is electrically connected to a third solenoid valve (41). The end of the manual switch S1 away from the power supply VCC is electrically connected to a NOT gate E1 and an AND gate E2. One input end of the NOT gate E1 is electrically connected to the manual switch S1, and the other input end is electrically connected to the power supply VCC. The output end of the NOT gate E1 outputs a shutdown signal; one input end of the AND gate E2 is electrically connected to the manual switch S1, and the other input end is electrically connected to the power supply VCC. The output end of the AND gate E2 outputs a conduction signal.

5. The automatic feeding control system of a hydrochloric acid conveying device according to claim 4 is characterized in that: The switch control module (3) further comprises a logic circuit (31), wherein the logic circuit (31) is connected to the detection module to receive a control signal, and is also connected to the logic control circuit (32) to receive a shutoff signal and a conduction signal. When the logic circuit (31) receives the control signal and the shutoff signal at the same time, the first solenoid valve (11) is controlled to be conducted with the second solenoid valve (21); and when the logic circuit (31) receives the conduction signal, the first solenoid valve (11) is controlled to be conducted with the third solenoid valve (41).

6. The automatic feeding control system of a hydrochloric acid conveying device according to claim 5, characterized in that: The logic circuit (31) comprises an AND gate E3, one input end of the AND gate E3 is connected to the first detection module (22) to receive a control signal, and the other input end is connected to the output end of the NOT gate E1 to receive a shutdown signal; the output end of the AND gate E3 is electrically connected to the second solenoid valve (21), the output end of the AND gate E3 and the other input end are electrically connected to an AND gate E4, one input end of the AND gate E4 is connected to the output end of the AND gate E3, and the other input end is connected to the input end of the AND gate E3 connected to the first detection module (22), the output end of the AND gate E4 is electrically connected to an OR gate E5, one input end of the OR gate E5 is electrically connected to the output end of the AND gate E2, and the other input end is electrically connected to the output end of the AND gate E4, and the output end of the OR gate E5 is electrically connected to the first solenoid valve (11).

7. The automatic feeding control system of a hydrochloric acid conveying device according to claim 6, characterized in that: The delivery pipe is provided with a delivery pump (5), and the delivery pump (5) is used to deliver the hydrochloric acid in the delivery pipe; the switch control module (3) also includes a motor reversing circuit (33), and the motor (51) of the delivery pump (5) is electrically connected to the motor reversing circuit (33); when the first solenoid valve (11) and the second solenoid valve (21) are simultaneously turned on, the motor reversing circuit (33) controls the motor (51) of the delivery pump (5) to rotate forward, and when the first solenoid valve (11) and the third solenoid valve (41) are simultaneously turned on, the motor reversing circuit (33) controls the motor (51) of the delivery pump (5) to rotate reversely.

8. The automatic feeding control system of a hydrochloric acid conveying device according to claim 7, characterized in that: The output end of the AND gate E4 is electrically connected to a relay coil KA2, and the two ends of the relay coil KA2 are electrically connected to the AND gate E4 and the OR gate E5 respectively; the output end of the AND gate E2 is electrically connected to a relay coil KA3, and the two ends of the relay coil KA3 are electrically connected to the AND gate E2 and the OR gate E5 respectively; the motor commutation circuit (33) includes a relay contact KA2-1 and a relay contact KA3-1, the relay contact KA2-1 is forwardly connected to the three-phase electricity of the motor (51), and the relay contact KA3-1 is reversely connected to the three-phase electricity of the motor (51).

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