Elevator unbalance loading prevention device

Abstract

The utility model provides an elevator anti-unbalance-loading device, which belongs to the technical field of elevators, and comprises an elevator cabin, an anti-unbalance-loading assembly and an unbalance-loading adjusting assembly, the anti-unbalance-loading assembly comprises a protection box arranged at the top of the elevator cabin, the inner wall of the protection box is provided with two guide plates, the outer walls of the two guide plates are connected with moving blocks in a sliding manner, and the moving blocks are connected with the elevator cabin. Synchronous motors are arranged at the tops of the two moving blocks, gears are arranged at the ends of output shafts of the two synchronous motors, racks are meshed with the bottoms of the two gears, the bottoms of the two racks are fixedly connected with the bottom of the inner wall of the protection box, a limiting strip is arranged between the two synchronous motors, and a fixing frame is arranged at the top of the limiting strip; two fixing plates are arranged at the top of the fixing frame, a torque motor is arranged on one side of one fixing plate, an output shaft of the torque motor penetrates through one fixing plate and is provided with a lead screw, and one side of the lead screw is rotationally connected with the other fixing plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of elevators, and in particular relates to an elevator anti-eccentric loading device. Background Art

[0002] Elevators can be roughly divided into the following categories according to their uses: passenger elevators, hospital bed elevators, sightseeing elevators, freight elevators, car elevators, etc. Regardless of whether the elevator transports people or goods, overloading will occur during the operation and loading and unloading of the elevator. After searching, the application number "CN202220557921.8" discloses "an elevator anti-overloading device", which records that "a limit guide assembly and a guide bar are provided, and the guide bar always passes through the limit guide assembly when the elevator is running; when the elevator is loading and unloading, the limit guide assembly can limit the horizontal movement of the guide bar, reduce or even avoid overloading of the elevator car, and improve the ride comfort of the elevator". By setting the limit guide assembly and the guide bar, the guide bar always passes through the limit guide assembly when the elevator is running. Indeed, when the elevator is loading and unloading, the limit guide assembly can limit the horizontal movement of the guide bar, reduce or even avoid overloading of the elevator car, and improve the ride comfort of the elevator. However, the above comparative documents still have the following problems in actual use:

[0003] In actual use, more guide bars do not easily cause overloading, but it is very difficult to correct it after overloading occurs, and there is no function to adjust and correct it after overloading during use.

[0004] Based on this, it is extremely practical to provide a device that can more stably and conveniently prevent overloading and return to the correct position after overloading. Utility Model Content

[0005] The purpose of the utility model is to provide an elevator anti-eccentric loading device, aiming to solve the above technical problems.

[0006] An embodiment of the utility model provides an elevator anti-eccentric load device, comprising an elevator car, an anti-eccentric load component and an eccentric load adjustment component.

[0007] Wherein, a base is provided at the bottom of the elevator compartment, and slide grooves are provided on both sides of the base;

[0008] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion.

[0009] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion.

[0010] In one embodiment of the present invention, a plurality of connecting seats are provided on the top and the bottom of the base of the elevator car, and a connecting frame is provided on the outer walls of the plurality of connecting seats.

[0011] In an embodiment of the present invention, a plurality of guide rails are provided in the middle of the plurality of connecting frames, and screws are threadedly connected at the connection points between the plurality of connecting seats and the connecting frames.

[0012] In one implementation of the present invention, a plurality of fixing seats are provided in the middle of both sides of the elevator car, and auxiliary wheels are rotatably connected to the interior of the plurality of fixing seats.

[0013] In one embodiment of the present invention, a reinforcement frame is provided in the middle of a plurality of the guide rails, and a reinforcement plate is provided on the outer walls of a plurality of the electric telescopic rods.

[0014] In one embodiment of the present invention, an angle sensor is provided at the middle of the bottom of the base, and levels are provided at both sides of the bottom of the base.

[0015] In one embodiment of the present invention, a plurality of connecting pieces are provided at the bottom of the base.

[0016] In one embodiment of the present invention, the reinforcement frame is cast from titanium alloy, and a PLC controller is provided at the bottom corner of the base.

[0017] In one embodiment of the present invention, the synchronous motor, torque motor, electric cylinder, electric telescopic rod, angle sensor and level are all electrically connected to a PLC controller, and the PLC controller is electrically connected to an external power supply.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1) The synchronous motor is provided to facilitate the elevator car being dragged. If the external sensor detects uneven force in the elevator car, the external sensor will feed back the information to the PLC controller, and the PLC controller will turn on the synchronous motor, which will drive the gear to rotate. The rotation of the gear will rotate on the rack. The movement of the gear on the rack will cause the synchronous motor to move itself. The movement of the synchronous motor itself will cause the moving block to move on the guide plate, and then limit the synchronous motor to make it more stable when moving. The synchronous motor drives the parts in the middle and top to move. When it moves to the specified position, the PLC controller will turn on the torque motor, and the torque motor output shaft will drive the screw to rotate. The rotation of the screw will be assisted by the external thread and the fixed bar, so that the auxiliary block drives the adjustment counterweight to move, and then the adjustment counterweight is adjusted to a place where the gravity is more dispersed, so that it matches the gravity of the people in the elevator car, and then the elevator car is more stable when being dragged and not prone to overload, thereby achieving the purpose of anti-overload.

[0020] 2) The electric telescopic rod is provided to facilitate the situation where the elevator car is overloaded during use. The PLC controller will first turn on the angle sensor, and the angle sensor will detect the angle of the elevator car in real time. When the angle changes, it is overloaded. When overload occurs, the angle sensor will feed back information to the PLC controller, and the PLC controller will turn on multiple electric telescopic rods and electric cylinders on one side, so that the electric telescopic rod will extend and then the electric telescopic rod will drive the support frame to move. At this time, the output shaft of the electric cylinder will cooperate with the electric telescopic rod to move, and then the support frame will be connected to the articulated seat to drive the connecting rod, and then the roller will be pushed out. At this time, the PLC controller turns on the electric cylinder alone, so that the output shaft of the electric cylinder drives the connecting block and then the connecting block pushes the moving plate, so that the moving plate and the articulated seat can be fine-tuned downward or upward, and then the angle of the roller is adjusted, so that the roller uses the electric cylinder and the electric telescopic rod, and cooperates with the anti-overload component to straighten the elevator car, so that the elevator car slowly returns to the center when it goes down or up. After returning to the center, it is reset by the electric cylinder and the electric telescopic rod, thereby achieving the purpose of overload adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the bottom structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the internal dissected structure of the base of the utility model;

[0025] Figure 4 This is a schematic diagram of the internal structure of the base of the utility model;

[0026] Figure 5 This is a perspective enlarged structural diagram of one end of the base of the utility model;

[0027] Figure 6 This is a schematic diagram of the internal structure of the protection box of the utility model.

[0028] Figure: 100, elevator car; 110, base; 200, anti-eccentric load assembly; 210, protection box; 220, guide plate; 230, synchronous motor; 240, gear; 250, rack; 260, limit bar; 270, fixing frame; 280, fixing plate; 290, torque motor; 2910, screw rod; 2920, fixing bar; 2930, auxiliary block; 2940, adjusting counterweight; 300, eccentric load adjustment assembly; 310, isolation plate; 320, partition Plate; 330, electric cylinder; 340, connecting block; 350, mobile plate; 360, articulated seat; 370, connecting rod; 380, roller; 390, support frame; 3910, electric telescopic rod; 3920, mobile frame; 3930, sliding guide rail; 400, connecting seat; 500, connecting frame; 600, guide rail; 700, auxiliary wheel; 800, reinforcement frame; 900, reinforcement plate; 1000, angle sensor; 1100, level; 1200, connector. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example

[0031] See also Figure 1-4 , an elevator anti-eccentric load device includes an elevator car 100, an anti-eccentric load component 200 and an eccentric load adjustment component.

[0032] For details, please refer to Figure 1 A base 110 is provided at the bottom of the elevator car 100, and sliding grooves are provided on both sides of the base 110.

[0033] See also Figure 1-6The anti-eccentric load component 200 includes a protection box 210 arranged on the top of the elevator car 100. The inner wall of the protection box 210 is provided with two guide plates 220. The outer walls of the two guide plates 220 are slidably connected with moving blocks. The tops of the two moving blocks are provided with synchronous motors 230. The output shaft ends of the two synchronous motors 230 are provided with gears 240. The bottoms of the two gears 240 are meshed with racks 250. The bottoms of the two racks 250 are fixedly connected to the bottom of the inner wall of the protection box 210. A limit bar 260 is provided in the middle of the two synchronous motors 230, and a fixed limit bar 260 is provided on the top of the limit bar 260. The frame 270 has two fixed plates 280 on its top, one side of which is provided with a torque motor 290, and the output shaft of the torque motor 290 passes through one of the fixed plates 280 and is provided with a screw rod 2910, one side of which is rotatably connected to the other fixed plate 280, and a fixing bar 2920 is provided in the middle of the two fixed plates 280, and the outer wall of the screw rod 2910 is threadedly connected to an auxiliary block 2930, and both ends of the inner part of the auxiliary block 2930 are slidably connected to the fixing bar 2920, and an adjustment counterweight block 2940 is provided on the top of the auxiliary block 2930.

[0034] In a specific embodiment, a synchronous motor 230 is provided to facilitate the elevator compartment 100 to be dragged. If an external sensor detects that the force in the elevator compartment 100 is uneven, the external sensor will feed back the information to the PLC controller, and the PLC controller will turn on the synchronous motor 230. The synchronous motor 230 drives the gear 240 to rotate, and the gear 240 rotates on the rack 250. The movement of the gear 240 on the rack 250 will cause the synchronous motor 230 to move itself. The movement of the synchronous motor 230 itself will cause the moving block to move on the guide plate 220, and then limit the synchronous motor 230 to make it move more smoothly. Stable, the synchronous motor 230 drives the parts in the middle and at the top to move. When it moves to the specified position, the PLC controller will turn on the torque motor 290. The output shaft of the torque motor 290 drives the screw rod 2910 to rotate. The rotation of the screw rod 2910 will be assisted by the external thread and the fixing bar 2920, so that the auxiliary block 2930 drives the adjustment counterweight block 2940 to move, and then the adjustment counterweight block 2940 is adjusted to a place where the gravity is more dispersed, so that it matches the gravity of the people in the elevator car 100, and then the elevator car 100 is more stable when being dragged and not prone to overloading, thereby achieving the purpose of preventing overloading.

[0035] See also Figure 3-5The eccentric load adjustment assembly 300 includes an isolation plate 310 arranged in the middle of the base 110, and connection grooves are opened on both sides of the isolation plate 310. A partition plate 320 is provided on the top of the isolation plate 310, and two electric cylinders 330 are provided on one side of the partition plate 320. The output shaft ends of the two electric cylinders 330 are provided with connection blocks 340. The ends of the two connection blocks 340 are hingedly hinged with a movable plate 350. The bottom of the movable plate 350 is provided with an articulated seat 360. One side of the articulated seat 360 is internally rotatably connected to a connecting rod 370, and the outer wall of the connecting rod 370 is provided with two rollers 380, the other side of the articulated seat 360 is hinged with a support frame 390, and two electric telescopic rods 3910 are provided on one side of the support frame 390. The outer walls of the two electric telescopic rods 3910 are fixedly connected to the isolation plate 310, and two movable frames 3920 are provided on the top of the support frame 390. The bottom of the movable frame 3920 is slidably connected with a sliding guide rail 3930, and the bottom of the two sliding guide rails 3930 are fixedly connected to the isolation plate 310. The other side of the partition plate 320 is provided with the same structure, and the bottom of the isolation plate 310 is provided with the same structure as its top.

[0036] In a specific embodiment, an electric telescopic rod 3910 is provided to facilitate the situation in which the elevator compartment 100 is overloaded during use. The PLC controller first turns on the angle sensor 1000, and the angle sensor 1000 detects the angle of the elevator compartment 100 in real time. When the angle changes, it is overloaded. When overloaded, the angle sensor 1000 feeds back information to the PLC controller, and the PLC controller turns on multiple electric telescopic rods 3910 and electric cylinders 330 on one side, so that the electric telescopic rod 3910 extends and then drives the support frame 390 to move. At this time, the output shaft of the electric cylinder 330 will cooperate with the electric telescopic rod 3910 to move, and then the support frame 390 is connected to the articulated seat 360 to drive the connecting rod 370, and then the roller 380 is pushed out. At this time, the PLC controller opens the electric cylinder 330 alone, so that the output shaft of the electric cylinder 330 drives the connecting block 340 and then the connecting block 340 pushes the movable plate 350, so that the movable plate 350 and the articulated seat 360 are fine-tuned downward or upward, and then the angle of the roller 380 is adjusted, so that the roller 380 uses the electric cylinder 330 and the electric telescopic rod 3910, and cooperates with the anti-eccentric load component 200 to align the elevator car 100, so that the elevator car 100 slowly returns to the center when it goes down or up, and after returning to the center, it is reset by using the electric cylinder 330 and the electric telescopic rod 3910, thereby achieving the purpose of eccentric load adjustment.

[0037] See also Figure 1 Several connecting seats 400 are provided on the top of the elevator car 100 and the bottom of the base 110, and connecting frames 500 are provided on the outer walls of the several connecting seats 400.

[0038] In a specific embodiment, the connecting base 400 is provided to facilitate the support and fixation of the connecting frame 500, so that the connecting frame 500 can be more stable during use, avoiding shaking during use and improving stability.

[0039] See also Figure 1 Several guide rails 600 are provided in the middle of the several connecting frames 500 , and screws are threadedly connected at the connection points between the several connecting seats 400 and the connecting frames 500 .

[0040] In a specific embodiment, screws are provided to facilitate fixing the guide rail 600 to the connecting base 400 through the connecting frame 500, so that the connecting base 400 can be more stable during use and avoid shaking during use.

[0041] See also Figure 1 Several fixed seats are provided in the middle of both sides of the elevator car 100, and auxiliary wheels 700 are rotatably connected inside the several fixed seats.

[0042] In a specific embodiment, the auxiliary wheels 700 are provided to facilitate connection with the slide rails near the elevator shaft, so that the auxiliary wheels 700 can slide in the slide rails of the elevator shaft, thereby assisting movement and preventing unbalanced loading.

[0043] See also Figure 1 A reinforcement frame 800 is provided in the middle of several guide rails 600, and a reinforcement plate 900 is provided on the outer wall of several electric telescopic rods 3910.

[0044] In a specific embodiment, a reinforcement plate 900 is provided to facilitate the use of the reinforcement plate 900 to support and fix the electric telescopic rod 3910 during use, so that the electric telescopic rod 3910 can be more stable during use.

[0045] See also Figure 2 An angle sensor 1000 is provided in the middle of the bottom of the base 110 , and a level 1100 is provided on both sides of the bottom of the base 110 .

[0046] In a specific embodiment, a level 1100 is provided, which makes it convenient for the user to turn on the level 1100 through the PLC controller during use, so that the level 1100 can cooperate with the angle sensor 1000 during use, and then detect whether the elevator car 100 is overloaded.

[0047] See also Figure 2 , a plurality of connecting members 1200 are provided at the bottom of the base 110 .

[0048] In a specific embodiment, the connecting piece 1200 is provided, so that the connecting piece 1200 can be used to connect with other parts during use, thereby improving work efficiency.

[0049] See also Figure 1 The reinforcement frame 800 is made of titanium alloy, and a PLC controller is provided at the bottom corner of the base 110.

[0050] In a specific embodiment, by providing titanium alloy, it is convenient to utilize the characteristics of titanium alloy when using the reinforcement frame 800, so that the reinforcement frame 800 can be more stable when in use, avoiding shaking during use and improving stability.

[0051] See also Figure 1-6 The synchronous motor 230, the torque motor 290, the electric cylinder 330, the electric telescopic rod 3910, the angle sensor 1000 and the level 1100 are all electrically connected to the PLC controller, and the PLC controller is electrically connected to the external power supply.

[0052] In a specific embodiment, a PLC controller is provided to facilitate power-on control of electrical equipment, so that the electrical equipment can be powered on when it needs electricity, avoiding the situation where it cannot be powered on when it needs electricity.

[0053] When in use, first, the synchronous motor 230 is provided to facilitate the elevator compartment 100 to be dragged. If the external sensor detects that the force in the elevator compartment 100 is uneven, the external sensor will feed back the information to the PLC controller, and the PLC controller will turn on the synchronous motor 230. The synchronous motor 230 drives the gear 240 to rotate. The rotation of the gear 240 will rotate on the rack 250. The movement of the gear 240 on the rack 250 will cause the synchronous motor 230 to move itself. The movement of the synchronous motor 230 itself will cause the moving block to move on the guide plate 220. Then the synchronous motor 230 is limited to make it more stable when moving. The synchronous motor 230 drives its The parts in the middle and at the top move, and when they move to the specified position, the PLC controller will turn on the torque motor 290, and the output shaft of the torque motor 290 will drive the screw 2910 to rotate. The rotation of the screw 2910 will be assisted by the external thread and the fixing bar 2920, so that the auxiliary block 2930 drives the adjustment counterweight block 2940 to move, and then the adjustment counterweight block 2940 is adjusted to a place where the gravity is more dispersed, so that it matches the gravity of the people in the elevator car 100, and then the elevator car 100 is more stable when being dragged and not prone to overload, thereby achieving the purpose of anti-overload, and then through the provided electric telescopic rod 3910, it is convenient to use When the elevator compartment 100 is overloaded, the PLC controller first turns on the angle sensor 1000, and the angle sensor 1000 detects the angle of the elevator compartment 100 in real time. When the angle changes, it is overloaded. When overloaded, the angle sensor 1000 feeds back the information to the PLC controller, and the PLC controller turns on multiple electric telescopic rods 3910 and electric cylinders 330 on one side, so that the electric telescopic rods 3910 extend and then the electric telescopic rods 3910 drive the support frame 390 to move. At this time, the output shaft of the electric cylinder 330 will cooperate with the electric telescopic rod 3910 to move, and then the support frame 390 connects to the articulated seat 360 to drive the connecting rod 37 0, and then the roller 380 is pushed out. At this time, the PLC controller opens the electric cylinder 330 alone, and finally the output shaft of the electric cylinder 330 drives the connecting block 340, and then the connecting block 340 pushes the movable plate 350, so that the movable plate 350 and the hinge seat 360 are fine-tuned downward or upward, and then the angle of the roller 380 is adjusted, so that the roller 380 uses the electric cylinder 330 and the electric telescopic rod 3910, and cooperates with the anti-eccentric load component 200 to align the elevator car 100, so that the elevator car 100 slowly returns to the center when it goes down or up, and after returning to the center, it is reset by using the electric cylinder 330 and the electric telescopic rod 3910, thereby achieving the purpose of eccentric load adjustment.

[0054] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An elevator anti-eccentric load device, characterized in that: include: An elevator compartment (100), wherein a base (110) is provided at the bottom of the elevator compartment (100), and slide grooves are provided on both sides of the base (110); An anti-eccentric load component (200) includes a protection box (210) arranged on the top of an elevator compartment (100), the inner wall of the protection box (210) is provided with two guide plates (220), the outer walls of the two guide plates (220) are slidably connected with moving blocks, the tops of the two moving blocks are provided with synchronous motors (230), the output shaft ends of the two synchronous motors (230) are provided with gears (240), the bottoms of the two gears (240) are meshed with racks (250), the bottoms of the two racks (250) are fixedly connected to the bottom of the inner wall of the protection box (210), a limit bar (260) is provided in the middle of the two synchronous motors (230), and the tops of the limit bars (260) are provided with A fixing frame (270) is provided, and two fixing plates (280) are provided on the top of the fixing frame (270), a torque motor (290) is provided on one side of one of the fixing plates (280), an output shaft of the torque motor (290) passes through one of the fixing plates (280) and is provided with a screw rod (2910), one side of the screw rod (2910) is rotatably connected to the other fixing plate (280), a fixing bar (2920) is provided between the two fixing plates (280), an outer wall of the screw rod (2910) is threadedly connected to an auxiliary block (2930), both inner ends of the auxiliary block (2930) are slidably connected to the fixing bar (2920), and an adjustment counterweight (2940) is provided on the top of the auxiliary block (2930); An eccentric load adjustment assembly (300) includes an isolation plate (310) disposed in the middle of a base (110), connection grooves are provided on both sides of the isolation plate (310), a partition plate (320) is provided on the top of the isolation plate (310), two electric cylinders (330) are provided on one side of the partition plate (320), the output shaft ends of the two electric cylinders (330) are provided with connection blocks (340), the ends of the two connection blocks (340) are hingedly connected to a movable plate (350), a hinge seat (360) is provided at the bottom of the movable plate (350), one side of the hinge seat (360) is internally rotatably connected to a connecting rod (370), and the connecting rod (370) is Two rollers (380) are provided on the outer wall, and a support frame (390) is hinged on the other side of the hinge seat (360), and two electric telescopic rods (3910) are provided on one side of the support frame (390). The outer walls of the two electric telescopic rods (3910) are fixedly connected to the isolation plate (310). Two movable frames (3920) are provided on the top of the support frame (390), and the bottom of the movable frame (3920) is slidably connected to a sliding guide rail (3930). The bottoms of the two sliding guide rails (3930) are fixedly connected to the isolation plate (310). The other side of the partition plate (320) is provided with the same structure, and the bottom of the isolation plate (310) is provided with the same structure as its top.

2. An elevator anti-eccentric load device according to claim 1, characterized in that: A plurality of connection seats (400) are provided on the top of the elevator cabin (100) and the bottom of the base (110), and a connection frame (500) is provided on the outer walls of the plurality of connection seats (400).

3. The elevator anti-eccentric load device according to claim 2, characterized in that: A plurality of guide rails (600) are provided in the middle of the plurality of connecting frames (500), and screws are threadedly connected at the connection points between the plurality of connecting seats (400) and the connecting frames (500).

4. The elevator anti-eccentric load device according to claim 1, characterized in that: A plurality of fixing seats are provided in the middle of both sides of the elevator cabin (100), and auxiliary wheels (700) are rotatably connected inside the plurality of fixing seats.

5. The elevator anti-eccentric load device according to claim 3, characterized in that: A reinforcement frame (800) is provided in the middle of each of the guide rails (600), and a reinforcement plate (900) is provided on the outer wall of each of the electric telescopic rods (3910).

6. The elevator anti-eccentric load device according to claim 5, characterized in that: An angle sensor (1000) is provided in the middle of the bottom of the base (110), and levels (1100) are provided on both sides of the bottom of the base (110).

7. The elevator anti-eccentric load device according to claim 6, characterized in that: A plurality of connecting members (1200) are provided at the bottom of the base (110).

8. The elevator anti-eccentric load device according to claim 6, characterized in that: The reinforcement frame (800) is cast from a titanium alloy, and a PLC controller is provided at the bottom corner of the base (110).

9. The elevator anti-eccentric load device according to claim 8, characterized in that: The synchronous motor (230), the torque motor (290), the electric cylinder (330), the electric telescopic rod (3910), the angle sensor (1000) and the level (1100) are all electrically connected to a PLC controller, and the PLC controller is electrically connected to an external power supply.

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