Safety protection device of rubber mixing mill

Abstract

The invention discloses a safety protection device of a rubber mixing mill. The safety protection device comprises a rubber mixing mill body, a driving device and a control system, according to the device, three protection units are integrated: an infrared induction braking unit, an infrared induction device is arranged at the upper part of an operation station to form a light curtain, and emergency braking is triggered when the light curtain is blocked; the kicking trigger type brake unit is used for triggering emergency stop in a kicking mode by arranging a kicking brake switch at the lower part of an operation station; and the ion static electricity eliminating unit is used for generating and blowing ion wind to neutralize static electricity of the sizing material through an ion static electricity releaser, a high-voltage static electricity generator and an air blower which are positioned above the station. The problems that in the prior art, mechanical damage protection is slow in response, operation is inconvenient, and electrostatic protection is not direct and not thorough are solved, and multiple safety protection which is rapid in response, comprehensive in coverage and high in integration degree is provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber mixing equipment, in particular to a safety protection device of a rubber mixing machine. BACKGROUND

[0002] The rubber mixing machine is a key equipment in the production of rubber products, which extrudes and shears the rubber material through two relatively rotating rollers. This process has significant safety risks: first, the hands, arms and other parts of the operator are in danger of being caught in the rollers, which can cause serious mechanical injuries; second, a large amount of static electricity is generated by the high-speed friction between the rubber material and the rollers, which accumulates on the surface of the rubber material, not only affecting the subsequent process, but also possibly causing static discharge sparks, which can easily cause fire or explosion accidents in an environment with flammable and explosive gases.

[0003] Currently, the safety protection measures of the traditional rubber mixing machine mainly include a mechanical safety lever or a single emergency stop button. The mechanical safety lever needs to be actively hit by the operator, which is not quick enough in response; the emergency stop button requires the operator to accurately find and press the button in an emergency, which is often difficult to achieve in panic. In addition, the existing technology usually uses an independent static electricity eliminator or indirectly handles it through workshop humidification to deal with the static electricity hazards generated during the rubber mixing process, but these measures are separate from the operation and safety interlocking system of the rubber mixing machine, and the protection is not direct and complete, leaving a safety blind area.

[0004] Therefore, there is a need for a safety protection device for a rubber mixing machine that is highly integrated, quick in response, comprehensive in coverage, and can fundamentally solve the mechanical injury and static electricity hazards. SUMMARY

[0005] In view of the above shortcomings of the prior art, the purpose of the present application is to provide a safety protection device for a rubber mixing machine to solve the problem of indirect and incomplete protection and the existence of a safety blind area.

[0006] A safety protection device for a rubber mixing machine, comprising a rubber mixing machine body, a driving device and a control system, the safety protection device comprising: an infrared induction braking unit, comprising an infrared induction device arranged on the upper part of the operating position and signal connected with the driving device, the infrared induction device being used to form a light curtain between the operator and the roller of the rubber mixing machine, and when the light curtain is blocked, a signal is triggered and the driving device is braked; a kick-triggered braking unit, comprising a kick brake switch arranged on the lower part of the operating position and signal connected with the driving device, when the kick brake switch is triggered, an emergency stop signal is sent to the control system, and the driving device is braked; An ion static electricity eliminating unit comprises an ion static electricity discharger, a high-voltage static electricity generator for powering the ion static electricity discharger, and a blower for delivering airflow to the ion static electricity discharger, the ion static electricity discharger being arranged above a mixing station for generating and blowing ions to neutralize static electricity on a surface of rubber material.

[0007] Advantages of the present application: The safety protection device of the mixing mill in the present application realizes non-contact and multi-directional active protection against mechanical injury by integrating infrared induction and kick-triggered double rapid braking mechanism, significantly improving response speed and operation convenience; meanwhile, the built-in ion static electricity eliminating unit can directly and actively neutralize static electricity generated in the production process from the source, effectively eliminating the fire and explosion hazards caused by static electricity discharge; the three protection units are managed by the same control system, solving the problems of slow reaction, existing safety blind area and incomplete static electricity protection of traditional protection measures, and providing comprehensive, efficient and integrated safety protection for mixing operation. BRIEF DESCRIPTION OF DRAWINGS

[0008] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which: Figure 1 It is an installation schematic diagram of the safety protection device on the mixing mill in the present embodiment; Figure 2 It is Figure 1 It is an enlarged view of area A in the present embodiment; Figure 3 It is a cross-sectional structure schematic diagram of the ion static electricity discharger in the present embodiment; Figure 4 It is a logic block diagram of the control system in the present embodiment; Figure 5 It is a program block diagram of the control system in the present embodiment; The reference signs are: 100-mixing mill body, 200-driving device, 300-control system, 400-infrared induction braking unit, 110-mixing mill roller, 410-infrared induction device, 412-transmitter, 413-receiver, 414-mounting bracket, 500-kick-triggered braking unit, 600-ion static electricity eliminating unit, 610-ion static electricity discharger, 620-high-voltage static electricity generator, 611-bus, 612-discharge needle, 631-silica gel air pipe, 613-voltage equalization air cavity, 310-input detection unit, 320-PLC control processing unit, 330-output execution unit. DETAILED DESCRIPTION

[0009] The application provides a safety protection device of a rubber mixing machine. The purpose, technical solutions and effects of the application are clearer and more explicit. The application is further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application and not to limit the application.

[0010] In the description of the application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0011] Please refer to Figures 1 to 5 : The embodiment discloses a safety protection device of a rubber mixing machine, which comprises a rubber mixing machine body 100, a driving device 200 and a control system 300. The safety protection device comprises three independent and complementary protection units, namely an infrared induction braking unit 400, a kick-triggered braking unit 500 and an ion static elimination unit 600.

[0012] In the embodiment, as shown in Figure 1 , the infrared induction braking unit 400 comprises an infrared induction device 410 connected with the driving device 200. The infrared induction device 410 is arranged on the upper part of the operating station in front of the rubber mixing machine body 100. The infrared induction device 410 is a transmitting or reflecting infrared grating. The infrared induction device 410 forms an invisible infrared light curtain above the area between the operating personnel and the rubber mixing machine roller 110. In an emergency, the operating personnel does not need to press the button. They only need to wave their hands to block the infrared light curtain to trigger an induction signal. The signal is transmitted to the control system 300. The control system 300 immediately instructs the driving device 200 to brake in an emergency to stop the rubber mixing machine.

[0013] Further, as shown in Figure 2 , the infrared induction device 410 is composed of a transmitter 412 and a receiver 413. The transmitter 412 and the receiver 413 are respectively fixed on the two sides of the operating platform of the rubber mixing machine body 100 through adjustable height mounting brackets 414. The mounting bracket is a bracket. In addition, the infrared grating has not less than 8 light beams. The vertical spacing between the light beams is not more than 70 mm, which ensures that even the smaller arm parts can effectively block the light beams. The total height of the infrared light curtain covers a range from 800 mm to 1600 mm above the operating platform to adapt to operators of different heights.

[0014] Further, the infrared light emitted by the emitter 412 is pulse-modulated at a specific frequency, and the receiver 413 is internally provided with a corresponding demodulation circuit. This design can effectively filter out the interference of ambient light, thereby reducing the false alarm rate.

[0015] In this embodiment, as shown in Figure 1 The kick trigger type brake unit 500 is arranged at the lower part of the operating position in front of the rubber mixing machine body 100, and includes a kick brake switch connected with the driving device 200. When the hands of the operator are occupied or the upper body loses balance, the switch can be triggered by kicking, and an emergency stop signal is sent to the control system 300, so that rapid braking is realized, and a second protection is provided for the safety of the operator. The trigger force of the kick brake switch is set to be greater than 80N, which is much greater than accidental leg contact, but is sufficient to reliably trigger the operator without aiming in an emergency.

[0016] In this embodiment, as shown in Figure 1 The ion static elimination unit 600 is arranged directly above the rubber mixing position, and includes an ion static discharger 610, a high-voltage static generator 620, and a blower. The high-voltage static generator 620 is electrically connected with the ion static discharger 610 to provide a high-voltage electric field for the ion static discharger 610. The air outlet of the blower is connected with the ion static discharger 610. In the rubber mixing process, the unit is started synchronously, the high-voltage static generator 620 continuously ionizes the air of the ion static discharger 610 to generate a large number of positive and negative ions, and the blower continuously blows air downward to blow the ion-containing air directly to the surface of the rubber on the rubber mixing machine roller 110. These positive and negative ions can effectively neutralize the static charge generated on the surface of the rubber due to friction, fundamentally prevent the accumulation of electric charge, and eliminate the fire or explosion hazard caused by static discharge (in the above, the blower is a conventional component and is not embodied in the drawings).

[0017] Further, the high-voltage static generator 620 adopts a high-frequency voltage doubling rectifier circuit, which can generate a balanced alternating high voltage of 5kV to 15kV, and the output frequency is between 50Hz and 60Hz. An electric current feedback module is integrated inside, which can automatically reduce the output voltage to avoid excessive loss when the discharge needle is found to have abnormal current due to pollution, and an alarm signal is sent through the control system 300.

[0018] Further, as shown in Figure 3 The ion static discharger 610 is a long strip-shaped copper alloy voltage-sharing bus 611, and a plurality of groups of tungsten steel discharge needles 612 are vertically fixed on the bus 611 at equal intervals to form a discharge needle array. The length of the array matches the working length of the rubber mixing machine roller 110 to ensure that the ion wind covers no dead angle. The shell of the ion static discharger 610 is made of arc-resistant polycarbonate insulating material to ensure that the high-voltage part is isolated from the outside.

[0019] Further, the air blower is a vortex air blower, and a high-temperature-resistant silica gel air pipe 631 is used to deliver clean and dry compressed air to the pressure-equalizing air cavity 613 at the rear of the ion electrostatic discharger 610. After the air flow passes through the guide vanes of the air cavity 613, it is uniformly blown through each discharge needle 612, and the positive and negative ions generated by ionization are efficiently blown to the rubber surface on the roller below.

[0020] In this embodiment, as shown in Figure 4 and Figure 5 The control system 300 includes an input detection unit 310, a PLC control processing unit 320, and an output execution unit 330. The input detection unit 310 is used to receive signals of three protection units in the safety protection device: first, the infrared sensing device 410 located at the upper part of the operating position continuously emits an infrared light curtain that is pulse-modulated, and once the light beam is blocked by the hand of the operator, a high-priority emergency stop signal is generated; second, when the kick brake switch located at the lower part of the operating position is subjected to a kick action of a specific force, a high-priority emergency stop signal is triggered.

[0021] Further, the signals received by the input detection unit 310 are sent to the PLC control processing unit 320 in real time, and the PLC control processing unit 320 cyclically scans the signal states received by the input detection unit 310 and performs high-speed logical operations and safety decision judgments. The core control logic follows the following principles: once any emergency stop signal from the infrared sensing device 410 or the kick brake switch is received, regardless of the state of the system, the PLC control processing unit 320 will immediately interrupt the normal program and send the highest-priority emergency brake command to the output execution unit 330; the output execution unit 330 outputs the emergency brake command and directly drives the brake of the driving device 200 of the rubber mixing machine, so that the emergency brake is realized within milliseconds, forcing the machine to stop running, thereby realizing the first and second safety guarantees against mechanical injury.

[0022] At the same time, the control system 300 also manages the static electricity elimination function in parallel. When the PLC control processing unit 320 receives a system normal operation signal, it will simultaneously start two output circuits: one triggers the high-voltage static electricity generator 620 to generate a balanced alternating high voltage of 5kV to 15kV, which is delivered to the array of tungsten discharge needles 612 of the ion electrostatic discharger 610 to ionize the air; the other starts the vortex air blower to deliver clean and stable air flow to the ion electrostatic discharger 610. High-voltage ionization and air flow delivery work together to generate and blow a large number of positive and negative ions directly onto the rubber surface of the roller 110 of the rubber mixing machine, thereby continuously neutralizing the static electricity generated during production, realizing the third safety guarantee against static electricity accumulation.

[0023] The preferred embodiments of the present application have been disclosed with specific reference to a preferred embodiment, and variations thereof, but it will be apparent to those skilled in the art that changes in form and detail can be made without departing from the spirit and scope of the application as set forth in the following claims.

Claims

1. A safety guard for a rubber mixing mill comprising a mill body, a drive means and a control system, characterised in that, The safety protection device comprises: an infrared induction braking unit, which comprises an infrared induction device arranged on the upper part of the operation station and connected with the driving device, and is used to form a light curtain between the operator and the roller of the rubber mixing machine, and when the light curtain is blocked, a signal is triggered and the driving device is braked; a kick-triggered braking unit, which comprises a kick braking switch arranged on the lower part of the operation station and connected with the driving device, and when the kick braking switch is triggered, an emergency stop signal is sent to the control system, and the driving device is braked; an ion static elimination unit, which comprises an ion static eliminator, a high-voltage static generator for supplying power to the ion static eliminator, and a blower for conveying airflow to the ion static eliminator, and the ion static eliminator is arranged above the rubber mixing station and is used to generate and blow ions to neutralize the static charge on the surface of the rubber material.

2. Safety guard for a masticating machine according to claim 1, characterized in that, The infrared induction device is a transmitting or reflecting infrared grating.

3. Safety guard for a masticating machine according to claim 2, characterized in that, The infrared grating has not less than 8 light beams, and the vertical spacing between the light beams is not more than 70 mm.

4. A safety guard for a rubber mixing machine according to claim 2, characterised in that The infrared light emitted by the emitter of the infrared grating is pulse-modulated at a specific frequency, and the receiver is internally provided with a corresponding demodulation circuit.

5. The safety shield for a rubber mixing machine according to claim 1, wherein The trigger force of the kick braking switch is set to be above 80 N.

6. The safety shield for a rubber mixing machine according to claim 1, wherein The high-voltage static generator can generate balanced alternating high voltage of 5 kV to 15 kV.

7. Safety guard for a masticating machine according to claim 6, characterized in that The high-voltage static generator is internally integrated with a current feedback module for automatically reducing the output voltage and sending an alarm signal when an abnormal current is monitored.

8. The safety shield for a rubber mixing machine according to claim 1, wherein The ion static eliminator comprises a long strip-shaped voltage equalization bus and a plurality of groups of tungsten steel discharge needles vertically fixed thereon to form a discharge needle array, and the length of the discharge needle array matches the working length of the roller of the rubber mixing machine.

9. The safety shield for a rubber mixing machine according to claim 1, wherein The core of the control system is a PLC control processing unit, which is configured to interrupt the normal program and send an emergency braking command with the highest priority to the driving device as soon as it receives an emergency stop signal from the infrared induction braking unit or the kick-triggered braking unit.

10. Safety guard for a masticating machine according to claim 9, characterized in that, The PLC control processing unit synchronously controls the high-voltage static generator and the blower to start when the system is running, so as to cooperatively perform the static elimination function.

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