A vegetable greenhouse curtain winding machine control box

Abstract

The utility model relates to the field of agricultural planting greenhouse, disclose a vegetable greenhouse roller shutter machine control box, including main circuit and control circuit, the main circuit includes isolating switch, the input of isolating switch QS connects three -phase power supply, the output of isolating switch QS parallel connection connects the input of first AC contactor KM1 and second AC contactor KM2, the output of first AC contactor KM1 and second AC contactor KM2 are connected to the roller shutter machine motor M after the series connection motor comprehensive protector JD -8, the grounding of roller shutter machine motor M is equipped with protection ground PE. In the utility model, when the motor overload, fuse, cut off secondary circuit, effectively prevent the current too big and cause equipment damage, and rear end protector can realize line break protection, the motor circuit can be immediately cut off power when disconnecting, guarantee equipment and personnel safety, realize the switching between two circuits of manual and automatic through pressing the change -over switch SA.

Description

Technical Field

[0001] This utility model relates to the field of agricultural greenhouses, and in particular to a control box for a vegetable greenhouse curtain rolling machine. Background Technology

[0002] A vegetable greenhouse is a facility used in agricultural production, primarily for growing vegetables, fruits, and other plants. It provides a suitable environment for plant growth by regulating environmental conditions such as temperature, humidity, and light, thereby improving yield and quality. Greenhouses are typically covered with plastic or glass, and their interiors allow for various management functions, including temperature control, ventilation, and irrigation. The control box for the greenhouse curtain rolling machine is the electronic equipment or control system used to control the rolling machine. It usually includes control circuits, sensors, and a display screen, and can receive information such as temperature and light levels, automatically or manually operating the rolling machine to open and close according to a preset program.

[0003] In the process of developing this application, the inventors discovered the following problems with existing technologies: The most primitive method for controlling vegetable greenhouses is using a reversing switch. This method requires constant monitoring and timely shutdown; even slight negligence can cause incalculable losses to growers, ranging from a few hundred to several thousand yuan, or even an unpredictable fire. Remote control via remote control or mobile phone is also available, but this requires a circuit board, which inherently increases the difficulty of use and maintenance costs.

[0004] Therefore, those skilled in the art have provided a control box for a vegetable greenhouse curtain rolling machine to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and propose a control box for a vegetable greenhouse curtain rolling machine. By pressing the switch SA, the manual and automatic circuits can be switched, ensuring that neither state is allowed to work at the same time.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A control box for a vegetable greenhouse curtain rolling machine includes a main circuit and a control circuit. The main circuit includes an isolating switch QS. The input terminal of the isolating switch QS is connected to a three-phase power supply. The output terminal of the isolating switch QS is connected in parallel to the input terminals of a first AC contactor KM1 and a second AC contactor KM2. The output terminals of the first AC contactor KM1 and the second AC contactor KM2 are connected in series to a motor integrated protector JD-8 and then to the curtain rolling machine motor M. The grounding terminal of the curtain rolling machine motor M is equipped with a protective grounding PE. The control circuit includes a manual control module, an automatic control module, and an interlock protection module. The manual control module includes a first intermediate relay KA1, a second intermediate relay KA2, a first time relay KT1, a second time relay KT2, a start button SB2, and a stop button SB1 connected in parallel. The automatic control module includes a first time control switch and a second time control switch. The output terminal of the first time control switch is connected in series with an upper limit switch SQ1, and the output terminal of the second time control switch is connected in series with a lower limit switch SQ2. The interlock protection module includes a normally closed contact KA1 and a normally closed contact KA2. The normally closed contact KA1 is connected in series with the KA2 coil circuit, and the normally closed contact KA2 is connected in series with the KA1 coil circuit.

[0007] Furthermore, a fuse FU is connected in series at the power input terminal of the control circuit.

[0008] Furthermore, the stop button SB1 is connected in series to the common terminal of the KA1 branch and the KA2 branch.

[0009] Furthermore, the timing unit of the first time relay KT1 is in the second range, while the timing unit of the second time relay KT2 is in the grade range.

[0010] Furthermore, the upper limit switch SQ1 is connected in series with the first time relay KT1, and the lower limit switch SQ2 is connected in series with the second time relay KT2.

[0011] This utility model has the following beneficial effects: This utility model discloses a control box for a vegetable greenhouse curtain rolling machine. When the motor is overloaded, the fuse blows, cutting off the secondary circuit and effectively preventing damage to the equipment due to excessive current. Furthermore, the downstream protector provides line break protection, immediately cutting off the power supply when the motor circuit is disconnected, ensuring the safety of the equipment and personnel. Switching between manual and automatic circuits is achieved by pressing the selector switch SA, ensuring that neither state is allowed to operate simultaneously, thus improving operational safety. Limit switches and upper limit switches are installed in series at the lower end; if the equipment's rigid connection bends, it will trigger the upper limit switch, immediately stopping the machine to prevent damage. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main circuit of this utility model; Figure 2 This is a schematic diagram of the manual part of the secondary circuit of this utility model; Figure 3 This is a schematic diagram of the automatic secondary loop of this utility model. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Reference Figure 1 , Figure 2 , Figure 3 One embodiment provided by this utility model: A control box for a vegetable greenhouse curtain rolling machine includes a main circuit and a control circuit. The main circuit includes an isolating switch QS. The input terminal of the isolating switch QS is connected to a three-phase power supply. The output terminal of the isolating switch QS is connected in parallel to the input terminals of a first AC contactor KM1 and a second AC contactor KM2. The output terminals of the first AC contactor KM1 and the second AC contactor KM2 are connected in series to a motor integrated protector JD-8 and then connected to the curtain rolling machine motor M. The grounding terminal of the curtain rolling machine motor M is equipped with a protective ground PE. The control circuit includes a manual control module, an automatic control module, and an interlocking protection module. The manual control module includes a first intermediate relay KA1, a second intermediate relay KA2, a first time relay KT1, a second time relay KT2, a start button SB2, and a stop button SB1 connected in parallel. The automatic control module includes a first time control switch and a second time control switch. The output terminal of the first time control switch is connected in series with an upper limit switch SQ1, and the output terminal of the second time control switch is connected in series with a lower limit switch SQ2. The interlock protection module includes a normally closed contact KA1 and a normally closed contact KA2. The normally closed contact KA1 is connected in series with the KA2 coil circuit, and the normally closed contact KA2 is connected in series with the KA1 coil circuit. A fuse FU is connected in series with the power input terminal of the control circuit. The stop button SB1 is connected in series with the common terminal of the KA1 branch and the KA2 branch. The timing unit of the first time relay KT1 is in the second range, and the timing unit of the second time relay KT2 is in the grade range. The upper limit switch SQ1 is connected in series with the first time relay KT1, and the lower limit switch SQ2 is connected in series with the second time relay KT2.

[0015] Specifically, the km AC contactor is used to power the motor at the back end. L1 and L3 are interchanged to achieve forward and reverse rotation. km1 and km2 are connected in parallel. In the secondary circuit, the start-stop function is achieved by self-locking of normally open contacts and interlocking of normally closed contacts, and the reverse rotation cannot be started when forward rotation is started, to prevent short circuit caused by simultaneous engagement. The QS disconnect switch realizes the on and off function in the circuit. The FU fuse will blow to protect against overload. It is only connected in series in the secondary circuit. The AC contactor is connected in series with the motor integrated protector (JD-8) to realize immediate protection after the line from the rear to the motor is broken. It also has overcurrent protection and stall protection, giving the motor three protections. PE motor grounding protection will protect personal safety when there is leakage. When the secondary circuit changeover switch SA is switched to manual mode, pressing SB2 energizes KA1, causing its normally open contact to close and self-lock, while its normally closed contact opens, preventing KA2 from energizing, thus achieving interlocking. Pressing SB1 stops KA1, which also stops km1. Pressing SB3 energizes KA2, causing its normally open contact to close and self-lock, while its normally closed contact opens, preventing KA1 from energizing, thus achieving interlocking. Pressing SB1 stops KA2, which also stops km2, thus implementing phase loss protection. In other words, when a phase is lost at the front end, neither km1 nor km2 can be energized. When the secondary circuit changeover switch SA is switched to the automatic section, the adjustable time control enables automatic operation. When time control 1 reaches its designated point, the intermediate relay KA3 is energized and self-locked, and the circuit runs in the forward direction. Time KT1 automatically disconnects when it reaches its designated point or when it hits the upper limit SQ1, and the forward rotation stops. When time control 2 reaches its designated point, the intermediate relay KA3 is energized and self-locked, and the circuit runs in the reverse direction. Time KT2 automatically disconnects when it reaches its designated point or when it hits the lower limit SQ2, and the reverse rotation stops. The circuit is connected to KA1 and KA2 to interlock and prevent short circuit caused by simultaneous engagement (forward rotation time control needs to be accurate to the second, and reverse rotation only needs to be accurate to the minute; the time relay is accurate to the second). By using a secondary circuit to connect the mechanical limit switch and the time relay in series, the equipment is given double protection to prevent losses caused by unexpected limit switch failures. A motor integrated protector is connected in series at the rear end of the contactor. If there is a fault at the rear end, it will open the circuit and cannot run. Install an upper limit switch at the lower end. When the equipment's hard connection bends and falls, it will touch the upper limit switch and immediately stop the machine to prevent damage. At this time, the upper limit switch at the lower end is installed at a position slightly lower than the lower limit switch.

[0016] Working principle: The QS disconnect switch realizes the on / off function in the circuit. The FU fuse will blow for overload protection. It is only connected in series in the secondary circuit. The AC contactor is connected in series with the motor integrated protector (JD-8) to realize immediate protection after the line from the rear to the motor is broken. It also has overcurrent protection and locked rotor protection, providing triple protection for the motor. PE motor grounding protection will protect personal safety when there is leakage. When the secondary circuit changeover switch SA is in the manual part, pressing SB2 will energize KA1 and it will close. The normally open contact will close and self-lock, and the normally closed contact will open, preventing KA2 from closing, thus achieving the purpose of interlocking. Pressing SB1 will stop KA1 and also stop km1. Pressing SB3 will energize KA2 and it will close. The open contact closes and self-locks, while the normally closed contact opens, preventing KA1 from engaging, thus achieving interlocking. Pressing SB1 stops KA2, which also stops km2, achieving phase loss protection. That is, when a phase is lost at the front end, neither km1 nor km2 can engage. When the secondary circuit changeover switch SA is switched to the automatic section, the adjustable time control enables automatic operation. When time control 1 reaches its designated point, the intermediate relay KA3 engages and self-locks, and the circuit runs in the forward direction. Time KT1 automatically disconnects when it reaches its designated time or when it hits the upper limit SQ1, stopping the forward rotation. When time control 2 reaches its designated time, the intermediate relay KA3 engages and self-locks, and the circuit runs in the reverse direction. Time KT2 automatically disconnects when it reaches its designated time or when it hits the lower limit SQ2, stopping the reverse rotation.

[0017] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A control box for a vegetable greenhouse curtain rolling machine, comprising a main circuit and a control circuit, characterized in that: The main circuit includes a disconnect switch. The input terminal of the disconnect switch QS is connected to a three-phase power supply. The output terminal of the disconnect switch QS is connected in parallel to the input terminals of the first AC contactor KM1 and the second AC contactor KM2. The output terminals of the first AC contactor KM1 and the second AC contactor KM2 are connected in series to the motor integrated protector JD-8 and then connected to the roller shutter motor M. The grounding terminal of the roller shutter motor M is provided with a protective ground PE. The control circuit includes a manual control module, an automatic control module, and an interlock protection module. The manual control module includes a first intermediate relay KA1, a second intermediate relay KA2, a first time relay KT1, a second time relay KT2, a start button SB2, and a stop button SB1 connected in parallel. The automatic control module includes a first time control switch and a second time control switch. The output terminal of the first time control switch is connected in series with an upper limit switch SQ1, and the output terminal of the second time control switch is connected in series with a lower limit switch SQ2. The interlock protection module includes a normally closed contact KA1 and a normally closed contact KA2. The normally closed contact KA1 is connected in series with the KA2 coil circuit, and the normally closed contact KA2 is connected in series with the KA1 coil circuit.

2. The control box for a vegetable greenhouse curtain rolling machine according to claim 1, characterized in that: A fuse FU is connected in series at the power input terminal of the control circuit.

3. The control box for a vegetable greenhouse curtain rolling machine according to claim 1, characterized in that: The stop button SB1 is connected in series to the common terminal of the KA1 branch and the KA2 branch.

4. The control box for a vegetable greenhouse curtain rolling machine according to claim 1, characterized in that: The timing unit of the first time relay KT1 is in the second range, and the timing unit of the second time relay KT2 is in the grade range.

5. The control box for a vegetable greenhouse curtain rolling machine according to claim 1, characterized in that: The upper limit switch SQ1 is connected in series with the first time relay KT1, and the lower limit switch SQ2 is connected in series with the second time relay KT2.

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