A kind of mixer maintenance safety protection device and method

Abstract

The present invention discloses a maintenance safety protection device and method for a mixer, which is an improvement made on the basis of a traditional safety protection method. The device combines the identity recognition of maintenance personnel with active and passive protection, and adopts a special design and control to achieve: only specific maintenance personnel can start and release the safety protection, thereby ensuring the absolute safety of the maintenance personnel; it can effectively prevent accidents caused by accidental closure of the safety door due to external force during maintenance, thereby improving the reliability of the maintenance safety protection system through safety door status detection; combined with traditional safety protection devices, accidents caused by failure of a single method are avoided, and multiple protections are provided to improve the safety of the protection system; in addition, the safety door closing detection sensor can be designed to be manually reset only by the maintenance personnel themselves, thereby avoiding the risk of safety system failure that may occur when the safety door is accidentally closed due to external force or when the face recognition system makes a wrong recognition, thereby greatly improving the reliability of the protection system.

Description

Technical Field

[0001] The invention belongs to the field of concrete machinery and relates to a mixer maintenance safety protection device and method. Background Art

[0002] As an important equipment in concrete mixing plants, the mixer mixes concrete evenly through the mechanical forces of its mixing blades, including flipping, squeezing, and dispersion. In daily life, we often hear about mechanical accidents involving concrete mixers that injure people. The main causes of the accidents are illegal operations by workers and failure of safety protection devices.

[0003] The current operating procedure for mixer maintenance is usually: before entering the mixer for maintenance, cut off the main power supply of the mixer, hang up the maintenance safety warning sign, press the emergency stop switch of the mixer, open the safety door of the mixer, and install a safety door closure detection sensor next to the safety door of the mixer. When the safety door is opened, the power supply of the mixer control circuit is disconnected, the mixer cannot start normally, and personnel enter the mixer for maintenance; after the maintenance is completed, the maintenance personnel come out of the mixer, close the safety door, and after detecting that the safety door is closed, the power supply of the mixer control circuit is connected, the emergency stop switch of the mixer is reset, and the main power supply of the mixer is closed. The mixer maintenance work is completed, and the mixer is allowed to restart.

[0004] At present, the operation and control of mixers generally adopts remote control, that is, centralized control in the operation room of the mixing station. When the mixer is repaired, various methods are adopted for safety protection, such as hanging safety warning signs, pressing emergency stop switches and opening maintenance doors. However, in actual situations, due to inadequate maintenance of equipment, safety protection switches may malfunction, safety doors may be accidentally closed, maintenance personnel have a weak sense of safety, and human errors caused by inadequate implementation of the work supervision system may lead to safety accidents involving personal injury.

[0005] The root cause is that all current mixer maintenance safety protection devices are based on the equipment itself, and control the power supply of the mixer control circuit by detecting the status of the maintenance door or emergency stop switch. This is a passive protection method, and its reliability depends on the quality of the equipment and the quality of the personnel. All safety protections can be lifted by personnel other than the maintenance personnel themselves, so there are certain blind spots and loopholes in safety protection. Summary of the invention

[0006] The purpose of the present invention is to address the deficiencies in the prior art and to provide a mixer maintenance safety protection device and method based on the combination of maintenance personnel identity recognition and active and passive protection.

[0007] The present invention is implemented by the following technical solutions:

[0008] A mixer maintenance safety protection device, the device comprising an identity recognition unit, a control unit, a power control unit, and a safety door detection control unit;

[0009] The identity recognition unit is a collection device for maintenance personnel using biometric technology;

[0010] The control unit is used to receive feedback information from the identity recognition unit and drive the power control unit and the safety door detection control unit to operate;

[0011] The power control unit receives the instruction from the control unit to control the on and off of the secondary circuit of the mixer;

[0012] The safety door detection control unit includes a driving device, an actuator, and a safety door closing detection sensor. The safety door closing detection sensor is installed at the end of the actuator and is initially located within the effective detection range of the safety door for detecting whether the safety door is closed. The safety door closing detection sensor can be driven forward or backward by the actuator. When the driving device controls the actuator to retreat, the actuator drives the safety door closing detection sensor to leave its original position and retreat outside the effective detection range of the safety door; when the driving device controls the actuator to reset, the actuator drives the safety door closing detection sensor to reset and continue to perform closing detection on the safety door.

[0013] In the above technical solution, further, the device also includes a traditional safety protection unit, and the traditional safety protection unit includes an emergency stop button to ensure that the mixer equipment will not operate when the emergency stop button is operated.

[0014] Furthermore, the device also includes an audible and visual alarm unit, which includes a flashing alarm light, a buzzer and an LED maintenance reminder sign, and is placed in the mixing station operation room to provide a warning during the maintenance process.

[0015] A mixer maintenance safety protection method is implemented based on the above device, and the method is as follows:

[0016] Pre-storing the identity information of the maintenance personnel in the identity recognition unit;

[0017] After the mixer stops, when the equipment needs maintenance, the maintenance personnel will be detected by the identity recognition unit and compared with the stored maintenance personnel information. If the identity is confirmed to be the maintenance personnel, the identity recognition unit will send an identity confirmation signal to the control unit, and the control unit will immediately start the maintenance safety protection, specifically: the power control unit will be activated to disconnect the power supply of the secondary control circuit for starting the mixer, making the start button of the mixer control device invalid; the drive device in the safety door detection control unit will control the actuator to retreat, driving the safety door closing detection sensor to retreat outside the effective detection range of the safety door, and it cannot be reset, ensuring that no signal is detected when the safety door is accidentally closed; if the identity recognition unit does not confirm the maintenance personnel, the control unit will not respond;

[0018] After the maintenance safety protection is activated, the equipment is prompted to enter the maintenance state. The maintenance personnel can press the emergency stop button in the traditional safety protection unit at the same time and enter the mixer for maintenance work;

[0019] During the maintenance process, if there are other personnel, including maintenance personnel other than those entering the mixer for maintenance, their face recognition will not be recognized and confirmed by the identity recognition unit; because the safety door detection control unit pushes the safety door closing detection sensor out of the effective detection range, when the safety door is accidentally closed due to external force or the face recognition system misidentifies, it will still not cause the safety door status detection sensor to misjudge;

[0020] After the inspection is completed, the maintenance personnel comes out of the mixer and comes to the identity recognition unit again for face recognition. After successful recognition, the system confirms that it is the same person who started the safety protection before. The control unit issues a safety protection release operation, and the power control unit connects the mixer control circuit power supply. The drive device in the safety door detection control unit controls the actuator to advance, and the actuator drives the safety door closing detection sensor to reset and restore the detection function. After closing the safety door, the safety door closing detection sensor detects that the safety door is in place, indicating that the equipment is normal. At the same time, after manually releasing the emergency stop button switch, the mixer can work normally.

[0021] Furthermore, the driving device may be implemented by a two-position five-way solenoid valve, and the actuator may be implemented by a cylinder.

[0022] Furthermore, the specific method of the two-position five-way solenoid valve controlling the cylinder propulsion is: the two-position five-way solenoid valve adopts dual electric control, one end is controlled by the control unit to be energized, so that the cylinder retracts, and the other end is manually controlled to be energized, so that the cylinder propels and realizes the resetting of the safety door closing detection sensor.

[0023] The beneficial effects of the present invention are:

[0024] 1. This method ensures that only professionals can perform equipment maintenance through maintenance personnel identification, avoiding the occurrence of unlicensed maintenance;

[0025] 2. In this method, only the maintenance personnel can remove the safety protection device, that is, the safety protection is activated before entering the mixer, and can only be removed after the maintenance personnel leave the mixer, which ensures the absolute safety of the maintenance personnel;

[0026] 3. The active support safety door protection device can effectively prevent accidents caused by accidental closing of the safety door by external force during maintenance by maintenance personnel. Compared with traditional safety protection methods, the present invention greatly improves the reliability of the maintenance safety protection system through safety door status detection.

[0027] 4. The combination of traditional safety protection devices and maintenance personnel identity recognition safety protection can avoid accidents caused by failure of a single method and improve the reliability of the protection system.

[0028] 5. In particular, in the preferred embodiment of the present invention, the design of the safety door closing detection sensor can only be manually reset by the maintenance personnel themselves, thereby avoiding the risk of safety system failure when the safety door is accidentally closed due to external force or the face recognition system misidentifies, and further improves the reliability of the protection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0030] Figure 1 It is a schematic diagram of a control principle of the device of the present invention;

[0031] Figure 2 It is a specific structural diagram of a safety door detection control unit;

[0032] Figure 3 It is a specific flow chart of the method of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] In order to solve the problems existing in the current mixer maintenance safety protection system, the present invention has developed a mixer maintenance safety protection device and method based on the combination of maintenance personnel identification and active and passive protection. It is an improvement on the traditional safety protection method. The special design and control can ensure that only specific maintenance personnel can start and release the safety protection.

[0035] The device includes an identity recognition unit, a control unit, a power control unit, a safety door detection control unit, a traditional safety protection unit, an audible and visual alarm unit, etc.

[0036] The identity recognition unit 1 is a maintenance personnel collection device using biometric technology. The device can be a face recognition system or a fingerprint reader. Through automatic recognition and comparison technology, only maintenance personnel can start the safety protection device. The identity recognition unit has an offline information storage function and can save the specific biological characteristics of maintenance personnel;

[0037] The control unit 2 may be composed of a control CPU and a relay circuit, and is used to receive feedback information from the identity recognition unit 1, and drive the power control unit 3, the safety door detection control unit 4 and the sound and light alarm unit 6 to operate;

[0038] The power control unit 3 may be composed of a switching power supply and a relay circuit, and is used to control the on and off of the secondary circuit of the mixer;

[0039] The safety door detection control unit 4 includes a driving device (a two-position five-way solenoid valve is used in this example) 41, an actuator (a cylinder is used in this example) 42, a safety door closing detection sensor 43, and a track 44. The safety door closing detection sensor 43 is installed at the end of the cylinder 42 and can be pushed or retracted by the cylinder. The two-position five-way solenoid valve 41 adopts double electric control. When one end is energized, the cylinder is retracted, and the other end is energized to control reset. When personnel enter the mixer for maintenance, the solenoid valve retraction end is controlled to act, and the cylinder 42 retracts to drive the safety door closing detection sensor 43 to leave its original position to outside the effective detection range when the safety door is closed;

[0040] The conventional safety protection unit 5 includes an emergency stop button to ensure that the mixer device will not operate when the emergency stop button is actuated;

[0041] The sound and light alarm unit 6 includes a flashing alarm light, a buzzer and an LED maintenance reminder sign, which is placed in the mixing station operation room to provide a warning during the maintenance process.

[0042] The following describes the workflow using face recognition technology for identity recognition:

[0043] Preparation work: Pre-store the identity information of the maintenance personnel in the identity recognition unit 1 through various forms such as standard TCP / IP, Wifi, USB flash drive, etc.

[0044] After the mixer stops and the equipment needs maintenance, the maintenance personnel scan their faces through the identity recognition unit 1. The identity recognition unit obtains the facial image feature data of the maintenance personnel through a dedicated dual camera and compares it with the maintenance personnel information stored in the identity recognition unit. If the identity is confirmed to be the maintenance personnel, the identity recognition unit 1 sends an identity confirmation signal to the control unit 2, and the control unit 2 immediately starts the maintenance protection system, specifically: the power control unit 3 is activated to disconnect the power supply of the secondary control circuit for starting the mixer, so that the start buttons of multiple centralized control rooms and on-site control box equipment in the control system are invalid; the safety door detection control unit 4 is activated, and one end of the two-position five-way solenoid valve 41 is energized and returned to the control end, driving the cylinder 42 to retract, driving the safety door closing detection sensor 43 to retract, ensuring that when the safety door is accidentally closed, the detection signal will not be activated, and at the same time, the control power supply of the reset end of the two-position five-way solenoid valve 41 is cut off, and the detection sensor cannot be reset; turn on the maintenance warning light in the control room, the buzzer continues to alarm, and the LED maintenance prompt sign displays the prompt "Maintenance is underway, production is prohibited". If other persons are performing the identification, the identity recognition unit 1 will not be successful and will give a voice prompt indicating that the operation has failed.

[0045] After all the safety start devices are started, the maintenance personnel can press the emergency stop button in the traditional safety protection unit 5 at the same time, and enter the mixer from the safety door to perform maintenance work. At this time, the traditional safety protection unit 5 also works and the mixer cannot be started normally.

[0046] During the maintenance process, if there are other personnel, including maintenance personnel other than the person entering the mixer for maintenance, their facial recognition will not be recognized and confirmed by the identity recognition unit 1, and the control unit 2 will not stop the safety protection measures; because the safety door detection control unit 4 pushes the safety door closing detection sensor out of the effective detection range, when the safety door is accidentally closed due to external force or the facial recognition system misidentifies, it will still not cause the safety door status detection sensor to misjudge.

[0047] After the inspection and maintenance is completed, only the maintenance personnel himself, after coming out of the mixer, comes to the identity recognition unit 1 again for face recognition. After successful recognition, the system confirms that it is the same person who started the safety protection before, and the control unit 2 issues a safety protection release operation. The power control unit 3 connects the mixer control circuit power supply, connects the two-position five-way solenoid valve 41 in the safety door detection control unit 4 to manually reset the control circuit power supply, manually resets the position of the safety door closing detection sensor 43, restores its detection function, closes the safety door, and the safety door closing detection sensor 43 detects that the safety door is in place, then the sound and light warning signal in the control room is released, and the LED inspection prompt sign displays "Equipment Normal". At the same time, after the emergency stop button switch is manually released, the mixer can work normally.

[0048] The technical solution provided by the present invention is described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A mixer maintenance safety protection device, characterized in that: The device comprises an identity recognition unit (1), a control unit (2), a power supply control unit (3), and a safety door detection control unit (4); The identity recognition unit (1) is a maintenance personnel collection and recognition device using biometric recognition technology; The control unit (2) is used to receive feedback information from the identity recognition unit (1) and drive the power control unit (3) and the safety door detection control unit (4) to operate; The power control unit (3) receives instructions from the control unit (2) to control the on and off of the secondary power supply of the mixer; The safety door detection control unit (4) comprises a driving device (41), an actuator (42), and a safety door closing detection sensor (43); the safety door closing detection sensor (43) is installed at the end of the actuator (42), and its initial position is within the effective detection range of the safety door, and is used to detect whether the safety door is closed; the safety door closing detection sensor (43) can be driven to advance or retreat by the actuator, and when the driving device (41) controls the actuator to retreat, the actuator (42) drives the safety door closing detection sensor (43) to leave its original position and retreat outside the effective detection range of the safety door; when the driving device (41) controls the actuator to reset, the actuator drives the safety door closing detection sensor to reset, and continues to perform closing detection on the safety door; The safety protection device further comprises a conventional safety protection unit, wherein the conventional safety protection unit (5) comprises an emergency stop button, so as to ensure that the mixer device will not operate when the emergency stop button is operated; The safety protection device also includes an audible and visual alarm unit. The audible and visual alarm unit (6) includes a flashing alarm light, a buzzer and an LED maintenance reminder sign. The unit is placed in the mixing station operation room to provide a warning during the maintenance process.

2. A mixer maintenance safety protection method, characterized in that: The method is implemented based on the device as claimed in claim 1, and the method is as follows: Pre-storing the identity information of the maintenance personnel in the identity recognition unit (1); After the mixer is shut down, when the equipment needs to be repaired, the maintenance personnel are detected by the identity recognition unit (1) and compared with the stored maintenance personnel information. If the identity is confirmed to be the maintenance personnel, the identity recognition unit (1) sends an identity confirmation signal to the control unit (2), and the control unit (2) immediately starts the maintenance safety protection, specifically: the power control unit (3) is activated to disconnect the power supply of the secondary circuit controlled by the mixer, so that the mixer start control circuit is invalid; the driving device (41) in the safety door detection control unit (4) is activated to control the actuator (42) to retreat, driving the safety door closing detection sensor (43) to retreat outside the effective detection range of the safety door, and it cannot be reset, ensuring that no signal is detected when the safety door is accidentally closed; if the identity recognition unit (1) does not confirm the maintenance personnel, the control unit does not respond; After the maintenance safety protection is activated, the equipment is prompted to enter the maintenance state. The maintenance personnel can simultaneously press the emergency stop button in the traditional safety protection unit (5), disconnect the mixer circuit breaker, hang a maintenance sign on the power cabinet door, and then enter the mixer to carry out maintenance work; During the maintenance process, if there are other personnel, including maintenance personnel other than the maintenance personnel entering the mixer, their face recognition will not be recognized and confirmed by the identity recognition unit (1); because the safety door detection control unit (4) pushes the safety door closing detection sensor out of the effective detection range, when the safety door is accidentally closed due to external force or the face recognition system misidentifies, it will still not cause the safety door status detection sensor to misjudge; After the inspection is completed, the inspector comes out of the mixer and comes to the identification unit (1) again to perform face recognition. After the recognition is successful, the system confirms that it is the same person who started the safety protection before. The control unit (2) issues a safety protection release operation, the power control unit (3) connects the mixer control circuit power supply, and the driving device (41) in the safety door detection control unit (4) controls the actuator to advance. The actuator drives the safety door closing detection sensor to reset and resume the detection function. After the safety door is closed, the safety door closing detection sensor (43) detects that the safety door is in place, indicating that the equipment is normal. At the same time, after the emergency stop button switch is manually released, the mixer can work normally.

3. The mixer maintenance safety protection method according to claim 2, characterized in that: The driving device (41) adopts a two-position five-way solenoid valve, and the actuator (42) adopts a cylinder.

4. The mixer maintenance safety protection method according to claim 3, characterized in that: The specific method of the two-position five-way solenoid valve controlling the cylinder advancement is as follows: the two-position five-way solenoid valve adopts dual electric control, one end of which is controlled by the control unit to be energized so as to retract the cylinder, and the other end is manually controlled to be energized so as to advance the cylinder to achieve the reset of the safety door closing detection sensor (43).

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