Marine medical waste disinfection system based on steam self-generation and PLC automatic control

Abstract

The invention relates to a marine medical waste disinfection system based on steam self-generation and PLC automatic control. A sterilization chamber is arranged on the upper portion of a sterilization cavity body, a water containing area is arranged on the lower portion of the sterilization cavity body, an air inlet electromagnetic valve is arranged at an air inlet of the sterilization chamber, an air outlet is connected with an ultraviolet sterilizer, a vacuum pump and an activated carbon filter through an exhaust electromagnetic valve, and the activated carbon filter is connected with an air vent; an electric heater is arranged at the bottom of the water containing area to form a steam generation module, a water supplementing electromagnetic valve is additionally arranged to supplement water needed by electric heating for the steam generation module, and the automatic water supplementing amount is controlled by arranging a liquid level sensor on the steam generation module; a medical waste disinfection device controller in the medical waste disinfection device control system adopts a PLC (Programmable Logic Controller), the PLC is connected with a temperature sensor and a pressure sensor which are arranged on a sterilization cavity body, and a control box is connected with the temperature sensor, the pressure sensor, an ultraviolet sterilizer, an activated carbon filter, a vacuum pump, electromagnetic valves and a medical waste disinfection device display.

Description

Technical Field

[0001] The invention relates to an automated high-temperature steam disinfection treatment system for medical waste on board ships, in particular to a medical waste disinfection system for ships based on steam self-generation and PLC automatic control. Background Art

[0002] The existing similar ship medical waste disinfection devices use an external steam source for high-temperature steam sterilization, and the sterilization process is controlled by a board card program, such as Figure 1 The external steam source needs to use a long-distance steam pipeline to supply gas, and the system steam pipeline must be drained before each use, which makes it difficult to use and maintain.

[0003] At the same time, the existing technology controls the sterilization process through the board card program, and there is no limited authority for operating parameter settings, which cannot avoid arbitrary modification or accidental touch, and does not have the function of restoring factory settings. After the parameters are adjusted, they cannot be restored to the default values, which poses certain safety hazards. Summary of the invention

[0004] Based on the above problems, the present invention proposes a medical waste disinfection system for ships based on steam self-generation and PLC automatic control, the purposes of which are as follows:

[0005] 1) Through the steam self-generation technology, the convenience of using and maintaining the medical waste disinfection device is improved, and the user experience is enhanced.

[0006] 2) Based on the existing board control program, PLC program design is used to eliminate potential safety hazards and enhance equipment safety.

[0007] To achieve the above-mentioned purpose, the technical scheme of the present invention is: a medical waste disinfection system for ships based on steam self-generation and PLC automatic control, comprising: a medical waste disinfection device, a medical waste disinfection device control system, the medical waste disinfection device comprising a sterilization chamber body containing a steam generation module, a solenoid valve, a temperature sensor, a pressure sensor, an ultraviolet sterilizer, an activated carbon filter, and a vacuum pump, the sterilization chamber body having an upper and lower structure, the upper part being a sterilization chamber, the lower part being a water storage area, an air inlet solenoid valve being arranged at an air inlet of the sterilization chamber, an air outlet being connected to the ultraviolet sterilizer, the vacuum pump, and the activated carbon filter through an exhaust solenoid valve, and the activated carbon filter being connected to the vent; the medical waste disinfection device control system comprising a medical waste disinfection device controller and a medical waste disinfection device display, the medical waste disinfection device controller adopts a PLC controller, the PLC controller is connected to a temperature sensor and a pressure sensor arranged on the sterilization chamber body, and a control box is connected to the temperature sensor, the pressure sensor, the ultraviolet sterilizer, the activated carbon filter, the vacuum pump, each solenoid valve, and the medical waste disinfection device display.

[0008] Furthermore, an electric heater is arranged at the bottom of the water storage area to form a steam generating module.

[0009] Furthermore, a water replenishment solenoid valve is provided at the bottom of the water storage area to replenish the water required for electric heating for the steam generating module. The amount of automatic water replenishment is controlled by arranging a liquid level sensor on the steam generating module.

[0010] Furthermore, the control system of the medical waste disinfection device comprehensively monitors the operating status of the medical waste disinfection device through a PLC control program, and implements the control of the vacuum pump, ultraviolet sterilizer and various solenoid valves.

[0011] Furthermore, the control system of the medical waste disinfection device collects the temperature signal of the device's temperature sensor and the pressure signal of the pressure sensor through a PLC control program, and outputs a control signal to the medical waste disinfection device after processing, so as to control the medical waste disinfection device to implement a high-temperature steam sterilization process, while realizing fault alarm and data communication with the auxiliary machine monitoring system.

[0012] A high-temperature steam sterilization treatment method for medical waste adopts a ship-based medical waste disinfection system based on steam self-generation and PLC automatic control, including four continuous process steps: a. pre-vacuum stage, b. steam generation stage, c. high-temperature sterilization stage, and d. cooling stage.

[0013] Furthermore, during the steam generation stage, the PLC controller controls the water replenishment solenoid valve to replenish water according to the liquid level signal to ensure the liquid level in the water storage area.

[0014] Furthermore, during the steam generation stage, after the water storage area is replenished with water, the PLC controller controls the electric heater to continuously operate at high speed based on the temperature sensor signal, heating the water into steam so that the temperature of the upper sterilization chamber quickly rises to 134°C.

[0015] Furthermore, during the steam generation stage, after the temperature of the sterilization chamber rises to 134°C, the PLC controller controls the electric heater to operate intermittently at a low speed, start at low temperature, and stop at high temperature based on the temperature sensor signal, to ensure that the sterilization temperature of the upper sterilization chamber is not lower than 134°C and lasts for not less than 45 minutes, so as to kill the bacteria contained in the medical solid waste.

[0016] Furthermore, in the four continuous process steps of the method under the "automatic" working condition, the PLC controller automatically adjusts the working state of the medical waste disinfection device and each solenoid valve according to the readings of the temperature sensor and the pressure sensor, and performs stage switching until the disinfection and sterilization of the medical solid waste is completed.

[0017] The beneficial effects of the present invention are:

[0018] 1) A steam generation module is arranged in the sterilization chamber, and a temperature sensor is used to control an electric heater to heat water and generate steam, thereby achieving high-temperature steam sterilization in the sterilization chamber;

[0019] 2) A water replenishment solenoid valve is provided to replenish the water required for electric heating for the steam generation module, and a liquid level sensor is provided on the steam generation module to automatically control the amount of water replenishment;

[0020] 3) Use PLC program to control the high-temperature steam sterilization process, increase parameter setting limit permissions, and avoid arbitrary modification;

[0021] 4) It has the function of restoring factory settings to ensure that the parameters can be restored to the default values ​​after being adjusted;

[0022] 5) Each digital input channel has separate electrical isolation to ensure that the signal will not affect the normal operation of the entire module in the case of strong electrical interference. Each group of digital outputs has fuse protection, which can automatically protect the module when overloaded. This is achieved through PLC hardware.

[0023] In summary, the present invention has the following advantages and features compared with the prior art:

[0024] 1) Through the self-generating steam design, there is no need for system steam source and steam pipeline coordination. It can be started with one button, ready to use and run automatically, which greatly improves the convenience of equipment use and maintenance.

[0025] 2) Ensure that the device is in a safe state and does not malfunction during the power-on process.

[0026] 3) Misoperation can be ignored and the device can be switched back to factory settings with one click if necessary.

[0027] 4) When the analog input exceeds the range or the analog signal is disconnected, a prompt will be given, and it has the function of equipment overload protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the existing technical roadmap of ship-based medical waste disinfection devices;

[0029] Figure 2 It is the technical roadmap of the medical waste disinfection system for ships based on steam self-generation and PLC automatic control of the present invention;

[0030] Figure 3 It is a working principle diagram of the steam self-generating medical waste disinfection device of the present invention;

[0031] Figure 4 It is a schematic structural diagram of the medical waste disinfection device of the present invention with self-generated steam;

[0032] Figure 5 It is a schematic diagram of the hardware structure of the control system of the steam self-generating medical waste disinfection device of the present invention;

[0033] Figure 6It is a schematic diagram of the software composition of the control system of the steam self-generating medical waste disinfection device of the present invention;

[0034] Figure 7 It is the human-machine interface operation display;

[0035] In the figure: 1-vent, 2-waste liquid discharge port, 3-cooling water inlet, 4-cooling water outlet, 5-air inlet, 6-sterilization chamber body, 7-water storage area, 8-sterilization chamber, 9-ultraviolet sterilizer, 10-vacuum pump, 11-activated carbon filter, 12-pressure sensor, 13-temperature sensor. DETAILED DESCRIPTION

[0036] In order to make the advantages and technical solutions of the present invention more clear and explicit, the present invention is described in detail below with reference to the accompanying drawings and specific implementation examples.

[0037] like Figures 2 to 6 As shown, an embodiment of the present invention proposes a medical waste disinfection system for ships based on steam self-generation and PLC automatic control, comprising:

[0038] 1) Medical waste disinfection device

[0039] It is mainly composed of a sterilization chamber body 6 (including a steam generation module), a solenoid valve, a temperature sensor 13, a pressure sensor 12, an ultraviolet sterilizer 9, an activated carbon filter 10, a vacuum pump 9 and a control box.

[0040] The sterilization chamber body 1 is designed as an upper and lower structure, with the upper part being the sterilization chamber 8 and the lower part being the water storage area 7. The sterilization chamber air inlet 5 is provided with an air inlet solenoid valve, and the air outlet is connected to a vacuum valve or connected to an ultraviolet sterilizer 9, a vacuum pump 10, and an activated carbon filter 11 through an exhaust solenoid valve, and the activated carbon filter 11 is connected to the vent 1; an electric heater is provided at the bottom of the water storage area 7 to form a steam generation module, which has two electric heating modes, high and low. High-grade heating is used in the heating stage to quickly electrically heat water to generate steam, and low-grade intermittent heating is used in the insulation stage to maintain the sterilization chamber temperature above 134°C for 45 minutes, which is used for high-temperature steam sterilization in the upper sterilization chamber 8, and a water replenishment solenoid valve is added to replenish the water required for electric heating for the steam generation module. By providing a liquid level sensor on the steam generation module, the automatic water replenishment amount is controlled; a condensation wastewater discharge solenoid valve is also provided at the bottom of the water storage area. A cooling water outlet 4 is provided on the outer jacket layer of the sterilization chamber body 1. The sterilization chamber body 6 is provided with a temperature sensor 13 and a pressure sensor 12, and the control box is connected to the liquid level sensor, the temperature sensor 13, the pressure sensor 12, the ultraviolet sterilizer 9, the activated carbon filter 11, the vacuum pump 10 and the electromagnetic valves.

[0041] like Figure 2, 3, 4 show the process route, working principle diagram and examples. The high-temperature steam sterilization process of medical waste mainly includes four continuous process steps: pre-vacuum stage, steam generation stage, high-temperature sterilization stage, and cooling stage. Under the "automatic" working condition, the internal program of the device control box automatically adjusts the working state of the equipment and valve according to the readings of the temperature sensor and pressure sensor, and switches the stages until the disinfection and sterilization of medical solid waste is completed.

[0042] 2) Medical waste disinfection device control system

[0043] The hardware components include: medical waste disinfection device controller and medical waste disinfection device display. Figure 5 shown.

[0044] The main function of the medical waste disinfection device control system software is to comprehensively monitor the operating status of the medical waste disinfection device and implement the control of the vacuum pump, ultraviolet sterilizer and electric valve. Through the medical waste disinfection device control system software, the relevant signal input (such as temperature signal, pressure signal, etc.) on the device is collected, and the control strategy is implemented after the signal is analyzed. At the same time, it has the functions of fault alarm and data communication with the auxiliary machine monitoring system.

[0045] The medical waste disinfection device control system software includes two software, namely the disinfection device control software and the disinfection device display software. The software composition is as follows Figure 6 shown.

[0046] The medical waste disinfection device control software and medical waste disinfection device display software set administrator and operator user names and passwords to limit login personnel and meet confidentiality requirements. When a user logs in to the interface as an operator, he can only perform page flipping and monitoring inspection operations, but cannot enter the system parameter interface, let alone modify the corresponding software parameter information; when the operator enters the password to log in to the interface as an administrator, the permission to enter the system parameter interface is opened, and the relevant software parameters can be modified and saved.

[0047] like Figure 7 As shown, the states that can be displayed on the human-machine interface include:

[0048] a. Installation process;

[0049] b. Equipment operating status;

[0050] c. Device operating parameters;

[0051] d. Through the screen, you can complete the temperature, pressure setting and stage running time setting.

Claims

1. A medical waste disinfection system for ships based on steam self-generation and PLC automatic control. It is characterized in that include: A medical waste disinfection device and a control system for a medical waste disinfection device. The medical waste disinfection device comprises a sterilization chamber body including a steam generating module, a solenoid valve, a temperature sensor, a pressure sensor, an ultraviolet sterilizer, an activated carbon filter and a vacuum pump. The sterilization chamber body has an upper and lower structure, the upper part is a sterilization chamber, and the lower part is a water storage area. An air inlet solenoid valve is arranged at the air inlet of the sterilization chamber, and the air outlet is connected to the ultraviolet sterilizer, the vacuum pump and the activated carbon filter through an exhaust solenoid valve, and the activated carbon filter is further connected to the air vent. The control system for the medical waste disinfection device comprises a medical waste disinfection device controller and a medical waste disinfection device display. The controller of the medical waste disinfection device adopts a PLC controller. The PLC controller is connected to a temperature sensor and a pressure sensor arranged on the sterilization chamber body, and a control box is connected to the temperature sensor, the pressure sensor, the ultraviolet sterilizer, the activated carbon filter, the vacuum pump, each solenoid valve and the medical waste disinfection device display.

2. According to claim 1, the medical waste disinfection system for ships based on steam self-generation and PLC automatic control, Features: An electric heater is arranged at the bottom of the water storage area to form a steam generating module.

3. According to claim 1, the medical waste disinfection system for ships based on steam self-generation and PLC automatic control, Features: A water replenishment solenoid valve is also provided at the bottom of the water storage area to replenish the water required for electric heating for the steam generating module. The amount of automatic water replenishment is controlled by setting a liquid level sensor on the steam generating module.

4. The medical waste disinfection system for ships based on steam self-generation and PLC automatic control according to claim 1, Features: The control system of the medical waste disinfection device comprehensively monitors the operating status of the medical waste disinfection device through the PLC control program, and implements the control of the vacuum pump, ultraviolet sterilizer and various solenoid valves.

5. According to claim 1, the medical waste disinfection system for ships based on steam self-generation and PLC automatic control, Features: The control system of the medical waste disinfection device collects the temperature signal of the device's temperature sensor and the pressure signal of the pressure sensor through the PLC control program, and outputs the control signal to the medical waste disinfection device after processing. It is used to control the medical waste disinfection device to implement the high-temperature steam sterilization process, and at the same time realize fault alarm and data communication with the auxiliary machine monitoring system.

6. A method for high-temperature steam sterilization of medical waste, using the medical waste disinfection system for ships based on steam self-generation and PLC automatic control as described in any one of claims 1 to 5, Features: It includes four continuous process steps: a. pre-vacuum stage, b. steam generation stage, c. high temperature sterilization stage, and d. cooling stage.

7. The high-temperature steam sterilization method for medical waste according to claim 6, Features: During the steam generation stage, the PLC controller controls the water replenishment solenoid valve to replenish water based on the liquid level signal to ensure the liquid level in the water storage area.

8. The high-temperature steam sterilization method for medical waste according to claim 6, Features: During the steam generation stage, after the water storage area is replenished with water, the PLC controller controls the electric heater to run continuously at high speed according to the temperature sensor signal, heating the water into steam so that the temperature of the upper sterilization chamber rises quickly to 134°C. The liquid level signal controls the water replenishment valve to replenish water to ensure the liquid level in the water storage area.

9. The high-temperature steam sterilization method for medical waste according to claim 6, Features: During the steam generation stage, the PLC controller controls the electric heater to run intermittently at low speed, start at low temperature and stop at high temperature based on the temperature sensor signal, ensuring that the sterilization temperature in the upper sterilization chamber is not lower than 134°C and lasts for not less than 45 minutes to kill the bacteria contained in the medical solid waste.

10. The high-temperature steam sterilization method for medical waste according to claim 6, Features: In the four continuous process of the method, under the "automatic" working condition, the PLC controller automatically adjusts the working state of the medical waste disinfection device and each solenoid valve according to the readings of the temperature sensor and the pressure sensor, and performs stage switching until the disinfection and sterilization of the medical solid waste is completed.

Images