A safety guard for small scale belt weigher

Abstract

The utility model discloses a safety device for small -size measurement belt scale, include: protective fence is set up in the outside of measurement belt scale, safety door is set up on the import of protective fence, proximity switch is set up on the import of protective fence with safety door corresponding, wherein, the signal output of proximity switch is connected with the control box of measurement belt scale, the utility model discloses a protective fence and safety door are set up, realizes the effective protection to operator, and through proximity switch interlocking control belt machine's operation, ensures the safe and stable operation of belt machine.

Description

Technical Field

[0001] This utility model relates to the technical field of safety protection equipment for belt scales, and in particular to a safety protection device for small measuring belt scales. Background Technology

[0002] Small-scale metering belt scales are widely used in industrial production for material conveying and metering. However, in actual operation, belt scales pose numerous safety hazards. If operators accidentally come into contact with moving parts such as belts and rollers while the equipment is running, personal injury is highly likely. Currently, the safety protection measures for small-scale metering belt scales on the market are relatively simple and cannot effectively meet the needs of safe production. There is an urgent need for a comprehensive and reliable safety protection device to ensure personnel safety and stable equipment operation. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a safety protection device for small-scale metering belt scales.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A safety protection device for a small measuring belt scale includes:

[0006] A protective fence is installed outside the weighing belt scale;

[0007] Safety gates are installed at the entrances of the protective fence;

[0008] A proximity switch is installed at the entrance of the protective fence and corresponds to the safety door;

[0009] The signal output terminal of the proximity switch is connected to the control box of the metering belt scale.

[0010] The control box contains a PLC controller, which is connected to the start-up and stop-down control sections of the metering belt scale.

[0011] The belt scale is equipped with a speed sensor at the belt drive motor. The signal output terminal of the speed sensor is connected to the PLC controller. When the speed sensor detects an abnormal belt speed, the PLC controller issues a warning to the on-site personnel.

[0012] The beneficial effects of this utility model are as follows: The protective fence effectively prevents personnel from contacting the moving parts of the belt scale, avoiding personal injury accidents caused by accidental contact. The safety gate and belt operation interlock limit device ensure that the belt conveyor can only operate when the safety gate is closed, further ensuring the safety of operators. This utility model monitors the belt conveyor's operating speed in real time through a speed sensor. When the belt experiences abnormal speed due to malfunctions such as belt misalignment or breakage, the control system can promptly stop the belt conveyor through the interlock limit device, preventing further damage to the equipment and improving its reliability and service life. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structural principle of this utility model;

[0014] Figure 2 This is a schematic diagram showing the connection principle between the control box, proximity switch, and speed sensor of this utility model. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0016] like Figure 1 and Figure 2 As shown, a safety protection device for a small metering belt scale includes: a protective fence 3, installed outside the metering belt scale 1; a safety door 4, installed at the entrance of the protective fence 3; and a proximity switch 5, installed at the entrance of the protective fence 3 and corresponding to the safety door 4. The signal output terminal of the proximity switch 5 is connected to the control box 2 of the metering belt scale 1. The control box 2 contains a PLC controller, which is connected to the start-up control section 7 and the stop-down control section 6 of the metering belt scale 1. A speed sensor 8 is installed at the belt drive motor of the metering belt scale 1, and the signal output terminal of the speed sensor 8 is connected to the PLC controller. When the speed sensor 8 detects an abnormal belt speed, the PLC controller issues a warning to the on-site personnel.

[0017] The protective fence 3 of this utility model is made of high-strength metal material, such as stainless steel, which has good corrosion resistance and impact resistance. The mesh size of the protective net is carefully designed to effectively prevent personnel's hands or other parts from accidentally entering the belt scale's operating area, without affecting the normal conveying and observation of materials. The protective fence 3 has an overall frame structure and is firmly installed around the belt scale's frame by bolts or welding, forming a closed protective space. An openable safety door 4 is provided on the front of the protective fence 3. The safety door 4 is connected to the frame of the protective fence 3 by hinges to ensure smooth opening and closing of the door.

[0018] A proximity switch 5 is installed on safety door 4, and is electrically connected to the PLC controller of the belt conveyor. When safety door 4 is closed, proximity switch 5 is in the closed state, and the belt conveyor PLC controller receives a signal, allowing the belt conveyor to start running. When safety door 4 is opened, proximity switch 5 is open, and the belt conveyor PLC controller immediately triggers the stop control section 6 of belt scale 1, stopping the belt conveyor and preventing personnel from entering the danger zone while the belt conveyor is running. Simultaneously, a speed sensor 8 is installed at the drive motor of the belt conveyor to monitor the belt conveyor's operating speed in real time. When speed sensor 8 detects abnormal belt conveyor speed, such as overspeed, stalling, or speed changes caused by belt misalignment, it transmits a signal to the PLC controller. The PLC controller triggers the stop control section 6 of belt scale 1 and issues an alarm signal to remind operators to handle the fault promptly. The PLC controller uses a programmable logic controller (PLC) as its core control unit, possessing powerful logic operation and data processing capabilities. The PLC receives signals from proximity switch 5 and speed sensor 8 and judges and controls the operating status of the belt conveyor according to a preset logic program.

[0019] The PLC controller is also equipped with a Human-Machine Interface (HMI), allowing operators to monitor the conveyor belt's operating parameters in real time, such as speed and material weight. They can also set and adjust parameters for safety devices, such as the sensitivity of proximity switch 5 and the alarm threshold for the speed sensor. Furthermore, the HMI can display fault information, facilitating quick troubleshooting and resolution for operators.

[0020] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A safety protection device for a small measuring belt scale, characterized in that, include: A protective fence (3) is installed outside the weighing belt scale (1); Safety gate (4) is installed at the entrance of the protective fence (3); A proximity switch (5) is installed at the entrance of the protective fence (3) and corresponds to the safety door (4); The signal output terminal of the proximity switch (5) is connected to the control box (2) of the metering belt scale (1).

2. The safety protection device for a small measuring belt scale according to claim 1, characterized in that, The control box (2) is equipped with a PLC controller, which is connected to the start-up control part (7) and the stop-down control part (6) of the metering belt scale (1).

3. A safety protection device for a small measuring belt scale according to claim 2, characterized in that, The belt conveyor drive motor of the metering belt scale (1) is equipped with a speed sensor (8). The signal output terminal of the speed sensor (8) is connected to the PLC controller. When the speed sensor (8) detects an abnormal belt conveyor speed, the PLC controller issues a warning to the on-site personnel.

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