Control circuit of pipeline pump

Abstract

The utility model discloses a control circuit of a pipeline pump. The device comprises a control switch QF2, an emergency stop button SB1, a change-over switch SA, a coil of a main contactor KM, a first intermediate relay KA1, a first switch S1, a second intermediate relay KA2, a second switch S2, a coil of a water spray valve HY, a third intermediate relay KA3, a fourth intermediate relay KA4, a fifth intermediate relay KA5, a high-liquid-level float switch S4 and a low-liquid-level float switch S3. The system has the advantages that a pipeline pump manual starting circuit can be switched to a pipeline pump automatic starting circuit through the change-over switch SA, and operation of the pipeline pump is automatically controlled according to the pressure value, detected by the electric contact pressure gauge, in the drainage pipe of the coal slime pool; meanwhile, a water spray valve manual starting circuit can be switched to a water spray valve automatic starting circuit, actions of the low-liquid-level float switch S3 and the high-liquid-level float switch S4 can be achieved according to the liquid level value of the coal slime pool, and operation of the water spray valve is automatically controlled.

Description

Technical field:

[0001] The utility model relates to the technical field of pipeline pump control, in particular to a control circuit of a pipeline pump. Background technology:

[0002] In the process of using belt conveyors to transport foamy coal in coal washing plants, water spraying devices are usually installed on the belt conveyors to suppress dust. After a long period of water spraying, a large amount of water will accumulate in the coal slime pool at the tail of the belt conveyor, and the accumulated water will be discharged through the drain pipe. Due to the untimely inspection of the post personnel, the pipeline pump on the drain pipe cannot be started and stopped in time, which often causes the accumulation of water to spread over a large area or the pipeline pump to run idle, seriously affecting production. Utility model content:

[0003] The utility model aims to provide a control circuit for a pipeline pump.

[0004] The purpose of the utility model is implemented by the following technical scheme: a control circuit of a pipeline pump, which includes a control switch QF2, an emergency stop button SB1, a conversion switch SA, a main contactor KM coil, a first intermediate relay KA1, a first switch S1, a second intermediate relay KA2, a second switch S2, a water spray valve HY coil, a third intermediate relay KA3, a fourth intermediate relay KA4, a fifth intermediate relay KA5, a high liquid level float switch S4 and a low liquid level float switch S3;

[0005] The main contactor KM coil, the b contact of the transfer switch SA, and the emergency stop button SB1 are connected in series to form a manual start circuit for the pipeline pump;

[0006] The normally open contact of the first intermediate relay KA1 and the main contactor KM coil are connected in series to form a first branch, the first switch S1, the normally closed contact of the second intermediate relay KA2, and the first intermediate relay KA1 coil are connected in series to form a second branch, the second switch S2 and the second intermediate relay KA2 coil are connected in series to form a third branch, the first branch, the second branch and the third branch are connected in parallel, and then connected in series with the c contact of the conversion switch SA and the emergency stop button SB1, and the two ends of the first switch S1 in the second branch are connected in parallel with the normally open contacts of the first intermediate relay KA1, forming an automatic start circuit for the pipeline pump;

[0007] The HY coil of the water spray valve, the b contact of the conversion switch SA, and the emergency stop button SB1 are connected in series to form a manual start circuit of the water spray valve;

[0008] The normally open contact of the water spray valve HY coil and the third intermediate relay KA3 are connected in series to form the fourth branch; the normally open contact of the fifth intermediate relay KA5, the normally closed contact of the fourth intermediate relay KA4, and the coil of the third intermediate relay KA3 are connected in series to form the fifth branch; the normally open contact of the high-level float switch S4 and the coil of the fourth intermediate relay KA4 are connected in series to form the sixth branch; the normally closed contact of the low-level float switch S3 and the coil of the fifth intermediate relay KA5 are connected in series to form the seventh branch; after the fourth branch, the fifth branch, the sixth branch, and the seventh branch are connected in parallel, they are connected in series with the c contact of the changeover switch SA and the emergency stop button SB1. A normally open contact of the third intermediate relay KA3 is connected in parallel at both ends of the normally open contact of the fifth intermediate relay KA5 in the fifth branch to form an automatic start line for the water spray valve.

[0009] Preferably, a normally closed contact of the thermal relay FR is connected between the emergency stop button SB1 and the common terminal of the changeover switch SA.

[0010] Preferably, the a contact of the SA changeover switch is in the neutral position, the b contact of the SA changeover switch is in the manual position, and the c contact of the SA changeover switch is in the automatic position.

[0011] Advantages of the present utility model: The present utility model can be switched from the manual start line of the pipeline pump to the automatic start line of the pipeline pump through the changeover switch SA, and automatically control the operation of the pipeline pump according to the pressure value detected by the electric contact pressure gauge in the drain pipe of the slime sump; at the same time, it can be switched from the manual start line of the water spray valve to the automatic start line of the water spray valve, and the low-level float switch S3 and the high-level float switch S4 can be actuated according to the liquid level value of the slime sump to automatically control the operation of the water spray valve. Description of the drawings:

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative labor, other drawings can be obtained based on these drawings.

[0013] Figure 1 It is a circuit schematic diagram of the present utility model.

[0014] Figure 2 It is a circuit schematic diagram of the main circuit controlled by the present utility model.

[0015] The markings of each component in the attached drawings are as follows: main switch QF1, main contactor KM, thermal relay FR, motor M, control switch QF2, emergency stop button SB1, changeover switch SA, first intermediate relay KA1, first switch S1, second intermediate relay KA2, second switch S2, water spray valve HY, third intermediate relay KA3, fourth intermediate relay KA4, fifth intermediate relay KA5, high-level float switch S4, low-level float switch S3, first branch 1, second branch 2, third branch 3, fourth branch 4, fifth branch 5, sixth branch 6, seventh branch 7. Detailed implementation mode:

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] As Figure 1 - Figure 2 shown, a control circuit of a pipeline pump includes a control switch QF2, an emergency stop button SB1, a normally closed contact of a thermal relay FR, a changeover switch SA, a main contactor KM coil, a first intermediate relay KA1, a first switch S1, a second intermediate relay KA2, a second switch S2, a water spray valve HY coil, a third intermediate relay KA3, a fourth intermediate relay KA4, a fifth intermediate relay KA5, a high-level float switch S4, and a low-level float switch S3; wherein, the a contact of the SA changeover switch is in the neutral position, the b contact of the SA changeover switch is in the manual position, and the c contact of the SA changeover switch is in the automatic position;

[0018] The main circuit controlled by the present invention is of an existing structure, which includes a main switch QF1, a normally open contact of a main contactor KM, a thermal relay FR coil, and a motor M. After sequentially connecting in series a main switch QF1, a normally open contact of a main contactor KM, and a thermal relay FR coil on the three-phase power line, the motor M is then connected to form the main circuit controlled by the present invention;

[0019] An electric contact pressure gauge is installed on the drain pipe of the pipeline pump. The electric contact pressure gauge is used to detect the pressure condition in the drain pipe. When the electric contact pressure gauge detects that the pressure in the drain pipe reaches the lower limit, the first switch S1 instantaneously closes. When the electric contact pressure gauge detects that the pressure in the drain pipe reaches the upper limit, the second switch S2 instantaneously closes;

[0020] Install a low-level float switch S3 and a high-level float switch S4 in the slime pond. When the liquid level in the slime pond is lower than the set minimum liquid level, the normally open contact of the high-level float switch S4 is in the open state, and the normally closed contact of the low-level float switch S3 is closed; when the liquid level in the slime pond is higher than the minimum liquid level and lower than the maximum liquid level, the normally open contact of the high-level float switch S4 is in the open state, and the normally closed contact of the low-level float switch S3 is in the open state; when the liquid level in the slime pond is higher than the set maximum liquid level, the normally closed contact of the low-level float switch S3 is in the open state, and the normally open contact of the high-level float switch S4 is closed;

[0021] The main contactor KM coil, the b contact of the change-over switch SA, the normally closed contact of the thermal relay FR, and the emergency stop button SB1 are connected in series to form a manual start circuit for the pipeline pump;

[0022] The normally open contact of the first intermediate relay KA1 and the main contactor KM coil are connected in series to form the first branch 1. The first switch S1, the normally closed contact of the second intermediate relay KA2, and the first intermediate relay KA1 coil are connected in series to form the second branch 2. The second switch S2 and the second intermediate relay KA2 coil are connected in series to form the third branch 3. After the first branch 1, the second branch 2, and the third branch 3 are connected in parallel, they are connected in series with the c contact of the change-over switch SA, the normally closed contact of the thermal relay FR, and the emergency stop button SB1. The normally open contact of the first intermediate relay KA1 is connected in parallel at both ends of the first switch S1 in the second branch 2. The above constitutes an automatic start circuit for the pipeline pump;

[0023] The water spray valve HY coil, the b contact of the change-over switch SA, the normally closed contact of the thermal relay FR, and the emergency stop button SB1 are connected in series to form a manual start circuit for the water spray valve;

[0024] The water spray valve HY coil and the normally open contact of the third intermediate relay KA3 are connected in series to form the fourth branch 4; the normally open contact of the fifth intermediate relay KA5, the normally closed contact of the fourth intermediate relay KA4, and the third intermediate relay KA3 coil are connected in series to form the fifth branch 5; the normally open contact of the high-level float switch S4 and the fourth intermediate relay KA4 coil are connected in series to form the sixth branch 6; the normally closed contact of the low-level float switch S3 and the fifth intermediate relay KA5 coil are connected in series to form the seventh branch 7; after the fourth branch 4, the fifth branch 5, the sixth branch 6, and the seventh branch 7 are connected in parallel, they are connected in series with the c contact of the change-over switch SA, the normally closed contact of the thermal relay FR, and the emergency stop button SB1. The normally open contact of the third intermediate relay KA3 is connected in parallel at both ends of the normally open contact of the fifth intermediate relay KA5 in the fifth branch 5. The above constitutes an automatic start circuit for the water spray valve.

[0025] Working process: Close the main switch QF1 and the control switch QF2. When the transfer switch SA is rotated to the manual gear position at the b contact, the coil of the main contactor KM is energized, the normally open contact of the main contactor KM in the main circuit closes, the motor M starts, and the pipeline pump runs; at the same time, the manual start circuit of the water spray valve is connected, and the water spray valve is always in the water spray state.

[0026] When the transfer switch SA is rotated to the automatic gear position at the c contact, the pipeline pump stops running. When the electric contact pressure gauge detects that the pressure in the drain pipe of the slime sump reaches the lower limit, the first switch S1 closes instantaneously, the coil of the first intermediate relay KA1 in the second branch 2 is energized instantaneously and the normally open contact of the first intermediate relay KA1 is closed to form self-locking; at the same time, the normally open contact of the first intermediate relay KA1 in the first branch 1 closes, the coil of the main contactor KM is energized, the normally open contact of the main contactor KM in the main circuit closes, the motor M starts, and the pipeline pump runs, so that the water in the slime sump is discharged from the drain pipe.

[0027] When the electric contact pressure gauge detects that the pressure in the drain pipe of the slime sump reaches the upper limit, the second switch S2 closes instantaneously, the coil of the second intermediate relay KA2 in the third branch 3 is energized, the normally closed contact of the second intermediate relay KA2 in the second branch 2 opens, the coil of the first intermediate relay KA1 loses power, the normally open contact of the first intermediate relay KA1 that has been closed in the first branch 1 opens, the coil of the main contactor KM loses power, the normally open contact of the main contactor KM that has been closed in the main circuit opens, the motor M stops, the pipeline pump stops running, and the pressure in the drain pipe of the slime sump continues to drop. When the electric contact pressure gauge detects again that the pressure in the drain pipe reaches the lower limit, the operation of the pipeline pump repeats the above process.

[0028] In addition, when the transfer switch SA is rotated to the automatic gear position at the c contact, the water spray valve stops spraying water. When the liquid level in the slime sump is lower than the set minimum liquid level, the normally open contact of the high liquid level float switch S4 is in the open state, the normally closed contact of the low liquid level float switch S3 closes, the coil of the fifth intermediate relay KA5 in the seventh branch 7 is energized, the normally open contact of the fifth intermediate relay KA5 in the fifth branch 5 closes, the coil of the third intermediate relay KA3 is energized instantaneously and the normally open contact of the third intermediate relay KA3 is closed to form self-locking; at the same time, the normally open contact of the third intermediate relay KA3 in the fourth branch 4 closes, the coil of the water spray valve HY is energized, and the water spray valve is in the water spray state, and the liquid level in the slime sump continues to rise.

[0029] When the liquid level in the slime pool is higher than the lowest liquid level and lower than the highest liquid level, the normally open contact of the high liquid level float switch S4 is in the off state, and the normally closed contact of the low liquid level float switch S3 is disconnected. The coil of the fifth intermediate relay KA5 in the seventh branch 7 loses power, and the normally open contact of the fifth intermediate relay KA5 that has been closed in the fifth branch 5 is disconnected. However, the third intermediate relay KA3 still maintains the self-locking state, and the water spraying valve is still in the water spraying state;

[0030] When the liquid level in the slime pool is higher than the set highest liquid level, the normally closed contact of the low liquid level float switch S3 is in the off state, and the normally open contact of the high liquid level float switch S4 is closed. The coil of the fourth intermediate relay KA4 is energized, the normally closed contact of the fourth intermediate relay KA4 in the fifth branch 5 is disconnected, the coil of the third intermediate relay KA3 loses power, the normally open contact of the third intermediate relay KA3 that has been closed in the fourth branch 4 is disconnected, the coil of the water spraying valve HY loses power, and the water spraying valve stops spraying water;

[0031] When the liquid level in the slime pool drops and is again higher than the lowest liquid level and lower than the highest liquid level, the normally open contact of the high liquid level float switch S4 is in the off state, and the normally closed contact of the low liquid level float switch S3 is in the off state. When the liquid level in the slime pool continues to drop and is again lower than the set lowest liquid level, the operation of the water spraying valve repeats the above process.

[0032] When it is necessary to stop the machine, when the emergency stop button SB1 is pressed once, the entire system stops running; or when the thermal relay FR operates, the entire system stops running.

[0033] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control circuit for a pipeline pump, characterized in that: It includes a control switch QF2, an emergency stop button SB1, a conversion switch SA, a main contactor KM coil, a first intermediate relay KA1, a first switch S1, a second intermediate relay KA2, a second switch S2, a water spray valve HY coil, a third intermediate relay KA3, a fourth intermediate relay KA4, a fifth intermediate relay KA5, a high liquid level float switch S4 and a low liquid level float switch S3; The main contactor KM coil, the b contact of the transfer switch SA, and the emergency stop button SB1 are connected in series to form a manual start circuit for the pipeline pump; The normally open contact of the first intermediate relay KA1 and the main contactor KM coil are connected in series to form a first branch, the first switch S1, the normally closed contact of the second intermediate relay KA2, and the first intermediate relay KA1 coil are connected in series to form a second branch, the second switch S2 and the second intermediate relay KA2 coil are connected in series to form a third branch, the first branch, the second branch and the third branch are connected in parallel, and then connected in series with the c contact of the conversion switch SA and the emergency stop button SB1, and the two ends of the first switch S1 in the second branch are connected in parallel with the normally open contacts of the first intermediate relay KA1, forming an automatic start circuit for the pipeline pump; The HY coil of the water spray valve, the b contact of the conversion switch SA, and the emergency stop button SB1 are connected in series to form a manual start circuit of the water spray valve; The water spray valve HY coil and the normally open contact of the third intermediate relay KA3 are connected in series to form the fourth branch; the normally open contact of the fifth intermediate relay KA5, the normally closed contact of the fourth intermediate relay KA4, and the coil of the third intermediate relay KA3 are connected in series to form the fifth branch; the normally open contact of the high liquid level float switch S4 and the coil of the fourth intermediate relay KA4 are connected in series to form the sixth branch; the normally closed contact of the low liquid level float switch S3 and the coil of the fifth intermediate relay KA5 are connected in series to form the seventh branch; after the fourth branch, the fifth branch, the sixth branch and the seventh branch are connected in parallel, they are connected in series with the c contact of the conversion switch SA and the emergency stop button SB1, and the normally open contacts of the third intermediate relay KA3 are connected in parallel at both ends of the normally open contact of the fifth intermediate relay KA5 in the fifth branch, forming an automatic start circuit for the water spray valve.

2. A control circuit for a pipeline pump according to claim 1, characterized in that: A normally closed contact of a thermal relay FR is connected between the emergency stop button SB1 and the common end of the conversion switch SA.

3. A control circuit for a pipeline pump according to claim 1 or 2, characterized in that: The contact a of the conversion switch SA is in the neutral position, the contact b of the conversion switch SA is in the manual position, and the contact c of the conversion switch SA is in the automatic position.

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