A run-off switch

Abstract

The application belongs to the technical field of conveyors, and particularly relates to a deviation switch, which comprises a bottom beam frame and a fixing box. The fixing box is fixed on the bottom beam frame, and multiple sub-grooves are arranged in the fixing box. A camera is fixedly connected in each sub-groove. A judgment circuit is fixedly connected in the fixing box. The multiple cameras are electrically connected with the judgment circuit. A glass plate is fixedly connected to the upper part of each sub-groove. The beam frame is arranged below a conveying belt. A mark line is drawn on the bottom of the conveying belt. The application has the advantages that the camera is arranged on the bottom of the conveying belt, and image contrast is used for detection, so that the camera does not directly contact the equipment, good detection effect is achieved, the stable operation of the equipment is maintained, and misjudgment is reduced.

Description

Technical Field

[0001] This invention belongs to the field of conveyor belt technology, and in particular relates to a belt misalignment switch. Background Technology

[0002] A belt misalignment switch is a device that uses a microcontroller to time the signal output. It is widely used on conveyor belts and is installed on the side of the conveyor belt to detect belt misalignment. This method not only wears down the device itself, but also affects its performance due to friction and slippage. In addition, because it is located on the side, some goods on the conveyor belt can also affect the device and cause false alarms.

[0003] Therefore, we propose a deviation switch to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a deviation switch that can maintain stable operation of equipment and reduce misjudgments.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a deviation switch, comprising a bottom beam frame and a fixing box, wherein the fixing box is fixed on the bottom beam frame, the fixing box is divided into multiple slots arranged in a longitudinal row, a camera is fixedly connected in the slot, a judgment circuit is fixedly connected in the fixing box, the multiple cameras are electrically connected to the judgment circuit, a glass plate is fixedly connected to the upper part of the slot, the beam frame is set below the conveyor belt, and a marking line is drawn on the bottom of the conveyor belt.

[0006] In the aforementioned deviation switch, multiple fixing boxes are arranged in a row on the bottom beam frame, and the fixing boxes are aligned with the marking line.

[0007] In the aforementioned misalignment switch, the distance between the fixed boxes is not less than one meter.

[0008] In the aforementioned deviation switch, a bracket is fixedly connected to the side wall of the fixed box, a roller is rotatably connected to the bracket, a generator set is fixedly connected to the side of the bracket, the generator set is electrically connected to multiple cameras and a judgment circuit, and the roller is in contact with the lower end of the conveyor belt.

[0009] In the aforementioned misalignment switch, a rubber layer is fixedly connected to the surface of the roller.

[0010] In the aforementioned misalignment switch, the rubber layer is serrated.

[0011] In the aforementioned misalignment switch, a stop block is fixedly connected to the bracket, and the upper end of the stop block abuts against the rubber skin layer.

[0012] In the aforementioned deviation switch, the stop block is located on the side where the roller rotates downwards.

[0013] In the aforementioned deviation switch, the marking line is in the form of a dashed line.

[0014] In the aforementioned deviation switch, cross marks are added at intervals on the dashed lines.

[0015] Compared with existing technologies, the advantages of this misalignment switch are:

[0016] 1. This invention uses a fixed box, slots, and cameras in conjunction with a judgment circuit to achieve multiple pattern analysis and comparison at the same location using multiple cameras within the fixed box. Furthermore, by uniformly setting up multiple fixed boxes for multiple analysis sessions without direct contact with the equipment, it achieves better detection results while maintaining stable equipment operation and reducing misjudgments.

[0017] 2. This invention, through the cooperation of a bracket, rollers, generator set, and stop blocks, achieves the goal of cleaning various debris adhering to the bottom of the conveyor belt by having the rollers contact the bottom of the belt, thus keeping the markings clean and tidy. In addition, the generator set generates its own electricity to supply power to the market, thereby achieving the purpose of energy conservation and emission reduction. Attached Figure Description

[0018] Figure 1 This is a side view of a deviation switch provided by the present invention;

[0019] Figure 2 yes Figure 1 A top-view structural diagram;

[0020] Figure 3 yes Figure 1 A schematic diagram of the structure on the other side;

[0021] Figure 4 yes Figure 1 A diagram showing the location of the award line;

[0022] Figure 5 yes Figure 1 Installation diagram of the central camera;

[0023] Figure 6 yes Figure 1 Schematic diagram of the roller installation structure.

[0024] In the diagram, 1 is the bottom beam frame, 2 is the fixing box, 3 is the slot, 4 is the camera, 5 is the glass plate, 6 is the marking line, 7 is the bracket, 8 is the roller, 9 is the generator set, 10 is the stop block, 11 is the cross mark, and 12 is the rubber skin layer. Detailed Implementation

[0025] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0026] Example

[0027] A belt misalignment switch uses a microcontroller's timing principle to control signal output. It's widely used on conveyor belts, detecting belt misalignment by being installed on the side of the belt in direct contact. This method not only wears down the equipment itself but also affects performance due to slippage caused by friction. Furthermore, because it's located on the side, goods on the conveyor belt can also affect the equipment, causing false alarms. Therefore, if... Figure 1-6 As shown, this solution designs a belt misalignment switch, including a bottom beam frame 1 and a fixing box 2. The fixing box 2 is fixed on the bottom beam frame 1, which is long and narrow and is fixed on the frame of the conveyor belt.

[0028] Multiple fixed boxes 2 are arranged longitudinally on the bottom beam frame 1. The fixed boxes 2 are used to acquire images and assess the posture of the conveyor belt. The beam frame 1 is located below the conveyor belt, and a marking 6 is drawn on the bottom of the conveyor belt. The fixed boxes 2 are aligned with the marking 6, with a minimum distance of 3 meters between them. Each fixed box 2 contains multiple slots 3 arranged longitudinally. Cameras 4 are fixedly connected to each slot 3, and glass plates 5 are fixedly connected to the upper part of each slot 3 for protection and shielding. An assessment circuit is fixedly connected inside each fixed box 2. All cameras 4 are connected to the assessment circuit. The circuit is electrically connected. Camera 4 captures the running path of the marking line 6 and compares it with the standard path in the judgment circuit. The offset range is set, such as ±1-3cm. At the same time, in order to prevent misjudgment and fluctuation offset judgment, multiple cameras 4 perform judgment at the same time, and multiple fixed boxes 2 also perform comparison at the same time. If multiple cameras 4 judge that the offset is too large at the same position, an alarm can be issued. When there is offset of the whole line or the point, the specific location can be used to judge and find the problem point or the type of problem.

[0029] Since the fixed box 2 requires a certain amount of electrical energy, and the movement of the conveyor belt does not fully utilize the electrical energy, a bracket 7 is fixedly connected to the side wall of the fixed box 2. A roller 8 is rotatably connected to the bracket 7, and a rubber layer 12 is fixedly connected to the surface of the roller 8. A generator set 9 is fixedly connected to the side of the bracket 7. The rubber layer 12 is serrated. The generator set 9 is electrically connected to multiple cameras 4 and the analysis circuit. The generator set 9 generates electrical energy through the rotation of the roller 8, and the electrical energy can replenish the fixed box 2 and other components for operation. Therefore, it can achieve better energy utilization and energy saving and emission reduction effects.

[0030] Due to long-term use, some debris will accumulate on the back of the conveyor belt, which will cause the markings 6 to be obscured. A stop block 10 is fixedly connected to the bracket 7. The upper end of the stop block 10 abuts against the rubber layer 12. The upper end face of the stop block 10 is arc-shaped. The stop block 10 is located on the side where the roller 8 rotates downward. The roller 8 abuts against the lower end of the conveyor belt. Since the rubber layer 12 is serrated, it can remove some debris. At the same time, the stop block 10 cleans the rubber layer 12, achieving the effect of long-term use.

[0031] Marker 6 is a dashed line, with cross markers 11 added at intervals to facilitate analysis. The switch uses a microcontroller to control the timing of signal generation. Specifically, the deviation switch circuit diagram of the analysis circuit is divided into three parts: power supply circuit, main control circuit, and output circuit. The power supply circuit uses 24V DC power and internally connects a 3.3V step-down chip to support the microcontroller's operation. The microcontroller is connected to the switch, LED, and output circuit signal connection port. When the switch is pressed, there is a 5-second delay (this delay time is obtained by adjusting the microcontroller's internal timer, and the time is arbitrarily adjustable) before the LED lights up. The microcontroller outputs a signal to the output circuit. After receiving the signal, the output circuit generates a 23V signal and sends it to the outside. The output stage circuit has an internal fuse. When a short circuit occurs in the external connection, the excessive current will burn the fuse, cutting off the circuit flow and protecting the external equipment.

[0032] The input voltage is DC 24V, and the power supply first passes through a varistor. When the voltage across the varistor is less than its threshold voltage, the current flowing through the varistor is extremely small, and the impedance appears infinitely large, equivalent to an open circuit. When the voltage across the varistor exceeds its threshold voltage, the current flowing through the varistor increases sharply, and the impedance appears infinitely small, equivalent to a short circuit, thus protecting downstream components from damage.

[0033] A TVS diode is connected after the varistor. Its function is similar to the varistor, but its response time is much faster. The varistor's response time is ≤25ns, while the TVS diode's response time is typically around 10ns. These two devices are used together because the varistor's ability to suppress surge voltages is limited, requiring the TVS diode to work in tandem. Furthermore, the device with the slower response time should be placed before the main stage, and the device with the faster response time should be placed after. This ensures that any surges that the main stage doesn't have time to absorb are absorbed by the secondary stage. If the device with the faster response time is placed before the main stage and the device with the slower response time after, then when a surge occurs, the surge voltage that the main stage doesn't have time to absorb will accumulate, putting considerable stress on the secondary stage. If this stress exceeds the secondary circuit's capacity, it will damage the secondary circuit and ultimately the entire circuit.

[0034] Following the TVS diode is a switching diode, which utilizes the unidirectional conductivity of a diode. When a forward current is present, the current flows and conducts positive charge. When a negative current is present, the diode does not conduct. In a circuit, it acts as a switch and provides isolation against reverse polarity. This characteristic of the switching diode is used to control the flow or interruption of current in the circuit. Switching diodes have very low forward resistance, very high reverse resistance, and extremely fast reverse recovery. Next is a capacitor filter circuit. The capacitor smooths the voltage; because the voltage across a capacitor cannot change abruptly, it filters out voltage spikes in the circuit, making the entire circuit more stable. At the same time, the capacitor is an energy storage element, filling short-term voltage gaps and maintaining voltage stability. U3 is an LDO chip that converts 24V to 3.3V to power the circuit. A capacitor is needed at the output voltage to absorb voltage spikes.

[0035] Although this document frequently uses terms such as bottom beam frame 1, fixing box 2, slot 3, camera 4, glass plate 5, marking line 6, bracket 7, roller 8, generator set 9, stop block 10, and cross mark 11, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A belt misalignment switch, characterized in that, Includes a base beam frame (1) and a fixing box (2). The fixing box (2) is fixed on the base beam frame (1). The fixing box (2) is divided into multiple slots (3) arranged in a longitudinal row. A camera (4) is fixedly connected in each slot (3). Multiple fixing boxes (2) are arranged in a longitudinal row on the base beam frame (1). The fixing boxes (2) are aligned with the marking line (6). A bracket (7) is fixedly connected to the side wall of the fixing box (2). A roller (8) is rotatably connected to the bracket (7). A generator set (9) is fixedly connected to the side of the bracket (7). The generator set (9) is electrically connected to multiple cameras (4) and the analysis circuit. The roller (8) is in contact with the lower end of the conveyor belt. A rubber layer (12) is fixedly connected to the surface. A stop block (10) is fixedly connected to the bracket (7). The upper end of the stop block (10) is in contact with the rubber layer (12). A judgment circuit is fixedly connected inside the fixed box (2). Multiple cameras (4) are electrically connected to the judgment circuit. A glass plate (5) is fixedly connected to the upper part of the slot (3). The bottom beam frame (1) is set below the conveyor belt. A marking line (6) is drawn on the bottom of the conveyor belt. The marking line (6) is in the shape of a dashed line. Cross marks (11) are added at intervals on the dashed marking line (6). The rubber layer (12) is serrated and can remove debris, so that the marking line is kept clean. At the same time, the stop block (10) cleans the rubber layer (12) to achieve the effect of long-term use.

2. The belt misalignment switch according to claim 1, characterized in that, The distance between the fixed boxes (2) shall not be less than 3 meters.

3. The belt misalignment switch according to claim 1, characterized in that, The upper end face of the stop (10) is arc-shaped, and the stop (10) is located on the side where the roller (8) rotates downward.

Images