CN112947619A

CN112947619A - Safe and simple all-in-one heating control system convenient to control

Info

Publication number: CN112947619A
Application number: CN202011638417.2A
Authority: CN
Inventors: 马梓文; 杨延君; 李洋
Original assignee: Shandong Holone Environment Technology Co ltd
Current assignee: Shandong Holone Environment Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-06-11
Anticipated expiration: 2040-12-31
Also published as: CN112947619B

Abstract

The application discloses a safe, simple and convenient-to-control all-in-one machine heating control system, which comprises a main control module, a PLC module and an electric heating module; the PLC module comprises a controllable programmer, a digital input/output module, an analog input module and an analog output module; the controllable programmer comprises a chip U1 to a chip U5, the models of the chip U1 to the chip U5 are SR60, the digital input and output module comprises a chip U6, the model of the chip U6 is EM-DR 32-1, the analog input module comprises a chip U7 and a chip U8, the models of the chip U7 and the chip U8 are EM-AE08, the analog output module comprises a chip U9, and the model of the chip U9 is EM-AQ 02. Has the following advantages: the energy is saved, the environment is protected, the energy is not wasted, and the heating effect can be achieved; the cost is low, the expected heating effect can be achieved by adopting the heating control mode, and a gas source and later maintenance treatment required in the heating process of natural gas are replaced; the electric heating has strong controllability, and is easy to realize automatic temperature control and remote temperature regulation.

Description

Safe and simple all-in-one heating control system convenient to control

Technical Field

The invention discloses a safe, simple and convenient-to-control all-in-one machine heating control system, and belongs to the technical field of electrical control systems.

Background

The existing all-in-one machine adopts a natural gas heating furnace, and the natural gas heating furnace has the following defects:

1. the cost of a natural gas furnace depends greatly on the size, complexity of architecture and application, requires plumbing connections into the supply lines, is expensive to install, requires high gas source investment, and is costly.

2. The potential for natural gas emissions and sample cross-contamination can result in the combustion of gases harmful to humans, so the flue gas must be strictly controlled or vented to standards, and potential leakage and safety hazards must be eliminated, greatly increasing labor and cost.

3. When the natural gas heating furnace is installed, related personnel and manufacturers need to be found for carrying out related processing, whether related equipment of natural gas can be installed or not is checked and confirmed, and then the installation, air source use and later maintenance costs of the natural gas heating furnace are very high.

Patent No. CN201520515174.1, the patent name is a gas formula design drying machine's patent has announced a gas formula design drying machine, characterized by: mainly constitute by furnace body, combustor, heating pipe, forced draught fan, spray header and fan, the externally mounted of furnace body has the combustor, the combustion chamber is installed between combustor and furnace body, forced draught fan establishes the outside one side at the furnace body, the inside of beating at the furnace body is established to the heating pipe, the one end and the combustion chamber of heating pipe link to each other, and forced draught fan is connected to the other end, the fan is installed in the inside of furnace body, is located the rear of heating pipe, the rear at the fan is established to the spray header.

Disclosure of Invention

The invention aims to solve the technical problems that the heating control system of the all-in-one machine is safe, simple and convenient to control, adopts a heating mode of electrical heating controlled by a contactor, is easy to install, is simple to operate, greatly reduces the cost, controls the contactor connected with the electrical heating through a programmed PLC program, and finally achieves the effect of heating treatment of each level of electrical heating.

In order to solve the technical problems, the invention adopts the following technical scheme:

a safe, simple and convenient-to-control all-in-one machine heating control system is characterized by comprising a main control module, a PLC module and an electric heating module; the PLC module comprises a controllable programmer, a digital input/output module, an analog input module and an analog output module; the controllable programmer comprises a chip U1 to a chip U5, the models of the chip U1 to the chip U5 are SR60, the digital input and output module comprises a chip U6, the model of the chip U6 is EM-DR 32-1, the analog input module comprises a chip U7 and a chip U8, the models of the chip U7 and the chip U8 are EM-AE08, the analog output module comprises a chip U9, and the model of the chip U9 is EM-AQ 02.

Further, the main control module comprises a three-phase power supply, wherein 1L1 wire, 1L2 wire and 1L3 wire of the three-phase power supply are connected with one end of a breaker QF1, the other end of the breaker QF1, 6 pins of the breaker QF1 and 1N wire of the three-phase power supply are connected with one end of a leakage breaker QF2, one end of a breaker QF3, one end of the breaker QF4 and one end of a breaker QF6, the other end of the leakage breaker QF2 is connected with 1 pin and 2 pins of a socket XS1 and 1 pin and 2 pins of a socket XS2, and a PE pin of the socket XS1 is grounded; the other end of the breaker QF3 is connected with one end of a direct current power supply DC1 and an L pin and an N pin of a PLC power supply, and the other end of the direct current power supply DC1 is connected with 24V and 0V; the other end of the breaker QF4 is connected with an L1 pin and an N1 pin of an electric executive power supply; the other end of the breaker QF6 is connected with an air conditioner EL3 and an EL 4; the 1L3 line of the three-phase power supply is connected with one end of a breaker QF5, the other end of the breaker QF5 is connected with one end of a temperature controller ST3, the other end of the temperature controller ST3 is connected with one end of a fan MF21, and the other end of the fan MF21 is connected with the 1N line of the three-phase power supply.

Further, the 1L1 line, the 1L2 line and the 1L3 line of the three-phase power supply of the main control module are connected with one end of a breaker QF7, the other end of the breaker QF7 is connected with one end of a breaker QF8, one end of a breaker QF9 and one end of a breaker QF10, the other end of the breaker QF8 is connected with one end of a switch of a contactor KM1 and one end of a switch of a relay KA17, the other end of the switch of the contactor KM1 is connected with a heating rod JR1, the other end of the switch of the relay KA17 is connected with one end of a coil of a contactor KM1, the other end of the coil of the contactor KM1 is connected with the 1N line of the three-phase power supply, the other end of the breaker QF9 is connected with one end of a switch of a contactor KM2 and one end of a switch of a relay KA18, the other end of the switch of the contactor KM 18 is connected with, the other end of the switch of the contactor KM3 is connected with a heating rod JR3, the other end of the switch of the relay KA19 is connected with one end of a coil of the contactor KM3, and the other end of the coil of the contactor KM3 is connected with a 1N wire of a three-phase power supply.

Furthermore, lines 1L1, 1L2 and 1L3 of the three-phase power supply of the main control module are connected with one end of a breaker QF11, the other end of the breaker QF11 is connected with one end of a breaker QF12, one end of a breaker QF13 and one end of a breaker QF14, the other end of the breaker QF12 is connected with one end of a switch of a contactor KM6 and one end of a switch of a relay KA20, the other end of the switch of the contactor KM6 is connected with a heating rod JR4, the other end of the switch of the relay KA20 is connected with one end of a coil of a contactor 85KM 25, and the; the other end of the breaker QF13 is connected with one end of a contactor KM7 switch and one end of a relay KA21 switch, the other end of the contactor KM7 switch is connected with a heating rod JR5, the other end of the relay KA21 switch is connected with one end of a contactor KM7 coil, and the other end of the contactor KM7 coil is connected with a 1N wire of a three-phase power supply; the other end of the breaker QF14 is connected with one end of a contactor KM8 switch and one end of a relay KA22 switch, the other end of the contactor KM8 switch is connected with a heating rod JR6, the other end of the relay KA22 switch is connected with one end of a contactor KM8 coil, and the other end of the contactor KM8 coil is connected with a 1N wire of a three-phase power supply.

Furthermore, a foot 0 of the DIa area of the chip U1 is connected with one end of a stop switch SB1, and the other end of the stop switch SB1 is connected with 24V; a foot 1 of a DIa area of the chip U1 is connected with one end of a change-over switch SA1, and the other end of the change-over switch SA1 is connected with 24V; a2 pin of a DIa area of the chip U1 is connected with one end of a switch of a contactor KM1, and the other end of the switch of the contactor KM1 is connected with 24V; the 3 feet of the DIa area of the chip U1 is connected with one end of a reset button SB2, and the other end of the reset button SB2 is connected with 24V; the DIa region 4 pin of the chip U1 is connected with one end of a contactor KM2 switch, and the other end of the contactor KM2 switch is connected with 24V; the foot 5 of the DIa area of the chip U1 is connected with one end of a reset button SB4, and the other end of the reset button SB4 is connected with 24V; the DIa region 6 pin of the chip U1 is connected with one end of a reset button SB5, and the other end of the reset button SB5 is connected with 24V; a foot 7 in a DIa region of the chip U1 is connected with one end of a switch of a contactor KM3, and the other end of the switch of the contactor KM3 is connected with 24V; a pin 0 in the Dib area of the chip U1 is connected with one end of an air source pressure gauge SP1, a pin 1 of the air source pressure gauge SP1 is connected with 24V, and a pin 2 of the air source pressure gauge SP1 is connected with 0V; pin 1 of the DIb area of the chip U1 is used for controlling the operation of the main fan; pin 2 of the DIb region of the chip U1 is used for controlling the fault of the main fan; the 3 feet of the DIb area of the chip U1 are connected with one end of a pressure relay PS001, and the other end of the pressure relay PS001 is connected with 24V; the 4 feet of the DIb area of the chip U1 are connected with one end of a contactor KM4 switch, and the other end of the contactor KM4 switch is connected with 24V; the 5 pins of the DIb area of the chip U1 are used for the operation control of the rotating wheel; the 6 pins of the DIb region of chip U1 are used for reel fault control; the 7-pin DIb region of chip U1 is used for jog wheel origin control.

Further, a pin 0 in a DIc area of the chip U2 is used for controlling the operation of the adsorption fan; the DIc area 1 pin of the chip U2 is used for controlling the fault of the fan by the wife; a pin 2 in a DIc area of the chip U2 is connected with one end of a pressure relay PS002, and the other end of the pressure relay PS002 is connected with 24V; a pin 3 in a DIc region of the chip U2 is connected with one end of a switch of a contactor KM5, the other end of the switch of the contactor KM5 is connected with 24V, a pin 4 in a DIc region of the chip U2 is connected with one end of a switch of a contactor KM6, and the other end of the contactor KM6 is connected with 24V; a pin 5 in a DIc area of the chip U2 is used for controlling the opening position of a spray valve; DIc zone 6 of chip U2 is used for shower valve closing in-place control; the pin 0 in the DId area of the chip U2 is used for controlling the opening position of the fresh air valve; a pin DId area 1 of the chip U2 is used for controlling the closing position of a fresh air valve; a pin 2 in a DId area of the chip U2 is used for controlling the fault of the hot air proportional valve; the pin DId and 3 of the chip U2 is used for desorption outlet valve fault control; the DId area 4 pin of the chip U2 is used for purging valve fault control; the 5 feet of the DId area of the chip U2 are connected with one end of a pressure relay PS3, and the other end of the pressure relay PS3 is connected with 24V; the 6 feet of the DId area of the chip U2 are connected with one end of a pressure relay PS4, and the other end of the pressure relay PS4 is connected with 24V; the 7 feet of the DId area of the chip U2 are connected with one end of a pressure relay PS5, and the other end of the pressure relay PS5 is connected with 24V.

Furthermore, a pin 0 of the DIc area of the chip U3 is connected with one end of a pressure relay PS5, and the other end of the pressure relay PS5 is connected with 24V; a1 pin of a DIc area of the chip U3 is connected with one end of a switch of a contactor KM6, and the other end of the switch of the contactor KM6 is connected with 24V; a pin 2 in a DIc area of the chip U3 is connected with one end of a switch of a contactor KM7, and the other end of the switch of the contactor KM7 is connected with 24V; a pin 3 in a DIc area of the chip U3 is connected with one end of a switch of a contactor KM8, and the other end of the switch of the contactor KM8 is connected with 24V;

the 1L pin and the 2L pin of the chip U6 are connected with 24V, the 0 pin of the chip U6 is connected with one end of a coil of a relay KA33, and the other end of the coil of the relay KA33 is connected with 0V; a pin 1 of the chip U6 is connected with one end of a coil of a relay KA34, and the other end of the coil of the relay KA34 is connected with 0V;

pins

2 and 3 of the chip U6 are connected with 0V;

the L + pin of the chip U7 is connected with 24V, the M pin of the chip U7 is connected with 0V, and the 0+ pin, the 0-pin, the 1+ pin and the 1-pin of the chip U7 are used for controlling the temperature of the hearth; the 2+ leg and the 2-leg of chip U7 are used for exhaust inlet temperature control; the 3+ and 3-pins of chip U7 are used for cooling outlet temperature control; the 4+ pin and the 4-pin of the chip U7 are used for controlling the temperature of the adsorption outlet; the 5+ leg and the 5-leg of the chip U7 are used for desorption inlet temperature control; the 6+ pin and the 6-pin of the chip U7 are used for desorption outlet temperature control; the 7+ leg and the 7-leg of chip U7 are used for furnace exit temperature control.

Furthermore, the 1L pin, the 2L pin and the 3L pin of the chip U4 are connected with 24V, the 1 pin of the chip U4 is connected with one end of a coil of a relay KA1, the other end of the coil of the relay KA1 is connected with 0V, and the part is used for operation control; the 2 pin of the chip U4 is connected with one end of a coil of a relay KA2, the other end of the coil of the relay KA2 is connected with 0V, and the part is used for fault control; the 3 feet of the chip U4 are connected with one end of a coil of a relay KA3, and the other end of the coil of the relay KA3 is connected with 0V; the 4 feet of the chip U4 are connected with one end of a coil of a relay KA4, and the other end of the coil of the relay KA4 is connected with 0V; the 5-pin of the chip U4 is connected with one end of a coil of a relay KA5, the other end of the coil of the relay KA5 is connected with 0V, and the part is used for automatic indication control; the 6 feet of the chip U4 are connected with one end of a coil of a relay KA6, and the other end of the coil of the relay KA6 is connected with 0V; the 7 feet of the chip U4 are connected with one end of a coil of a relay KA7, the other end of the coil of the relay KA7 is connected with 0V, and the part is used for controlling the opening of a fresh air valve; the 8 feet of the chip U4 are connected with one end of a coil of a relay KA8, the other end of the coil of the relay KA8 is connected with 0V, and the part is used for closing control of a fresh air valve; a pin 9 of the chip U4 is connected with one end of a coil of a relay KA9, the other end of the coil of the relay KA9 is connected with 0V, and the part is used for starting control of the main fan; a pin 10 of the chip U4 is connected with one end of a coil of a relay KA10, the other end of the coil of the relay KA10 is connected with 0V, and the part is used for reset control of the main fan;

the 11 pin of the chip U4 is connected with one end of a coil of a relay KA11, the other end of the coil of the relay KA11 is connected with 0V, and the part is used for controlling the starting of a cooling fan of the main fan; the 12 pins of the chip U4 are connected with one end of a coil of a relay KA12, the other end of the coil of the relay KA12 is connected with 0V, and the part is used for turning wheel starting control; the 13 feet of the chip U4 are connected with one end of a coil of a relay KA13, the other end of the coil of the relay KA13 is connected with 0V, and the part is used for resetting the rotating wheel; the 14 feet of the chip U4 are connected with one end of a coil of a relay KA14, the other end of the coil of the relay KA14 is connected with 0V, and the part is used for absorbing the starting control of the fan; the 15 pins of the chip U4 are connected with one end of a coil of a relay KA15, the other end of the coil of the relay KA15 is connected with 0V, and the part is used for adsorbing the reset control of the fan; the 16 feet of the chip U4 are connected with one end of a coil of a relay KA16, the other end of the coil of the relay KA16 is connected with 0V, and the part is used for controlling the cooling start of the adsorption fan.

Furthermore, pins 1L, pins 2L and pins 3L of the chip U5 are connected with 24V, pin 1 of the chip U5 is connected with one end of a coil of a relay KA17, the other end of the coil of the relay KA17 is connected with 0V, and the part is used for primary heating of a desorption area; the 2 pin of the chip U5 is connected with one end of a coil of a relay KA18, the other end of the coil of the relay KA18 is connected with 0V, and the part is used for secondary heating of a desorption area; the 3 feet of the chip U5 are connected with one end of a coil of a relay KA19, the other end of the coil of the relay KA19 is connected with 0V, and the part is used for three-stage heating of a desorption area; the 4 feet of the chip U5 are connected with one end of a coil of a relay KA20, the other end of the coil of the relay KA20 is connected with 0V, and the part is used for primary heating of the CO furnace; the 5 feet of the chip U5 are connected with one end of a coil of a relay KA21, the other end of the coil of the relay KA21 is connected with 0V, and the part is used for secondary heating of the CO furnace; the 6 feet of the chip U5 are connected with one end of a coil of a relay KA22, the other end of the coil of the relay KA22 is connected with 0V, and the part is used for three-stage heating of the CO furnace;

the 7 pins of the chip U5 are connected with one end of a coil of a relay KA23, and the other end of the coil of the relay KA23 is connected with 0V; the 8 pins of the chip U5 are connected with one end of a coil of a relay KA24, and the other end of the coil of the relay KA24 is connected with 0V; the 9 pin of the chip U5 is connected with one end of a coil of a relay KA25, the other end of the coil of the relay KA25 is connected with 0V, and the part is used for controlling the opening of a water fire-fighting valve; the pin 10 of the chip U5 is connected with one end of a coil KA26, the other end of the coil KA26 is connected with 0V, and the part is used for closing and controlling a water fire-fighting valve; the 11 pin of the chip U5 is connected with one end of a coil of a relay KA27, the other end of the coil of the relay KA27 is connected with 0V, and the part is used for controlling the opening of a nitrogen fire valve; the 12 feet of the chip U5 are connected with one end of a coil of a relay KA28, the other end of the coil of the relay KA28 is connected with 0V, and the part is used for controlling the closing of a nitrogen fire valve; the 13 feet of the chip U5 are connected with one end of a coil of a relay KA29, the other end of the coil of the relay KA29 is connected with 0V, and the part is used for controlling the operation of the spray pump; the 14 pins of the chip U5 are connected with one end of a coil of a relay KA30, and the other end of the coil of the relay KA30 is connected with 0V; the 15 pins of the chip U5 are connected with one end of a coil of a relay KA31, and the other end of the coil of the relay KA31 is connected with 0V; one end of a coil of a relay KA32 is connected with a pin 16 of the chip U5, and the other end of the coil of the relay KA32 is connected with 0V.

Furthermore, the L + pin of the chip U8 is connected with 24V, the M pin of the chip U8 is connected with 0V, and the 0+ pin and the 0-pin of the chip U8 are used for controlling the inlet temperature of the heat exchanger; the 1+ pin and the 1-pin of the chip U8 are used for controlling the temperature of the outlet of the heat exchanger; the 2+ pin and the 2-pin of the chip U8 are used for controlling the pressure of the hearth; the 4+ pin and the 4-pin of the chip U8 are used for feedback control of the hot air proportional valve; the 5+ pin and the 5-pin of the chip U8 are used for feedback control of a desorption outlet valve; the 6+ pin and the 6-pin of the chip U8 are used for feedback control of the purge valve;

the pin 0M and the pin 0M of the chip U9 are used for controlling the frequency of the rotary wheel motor;

pins

1M and 1 of chip U9 are used for purge valve given control; the 2M pin and the 2 pin of the chip U9 are used for given control of a hot air proportional valve;

pins

3M and 3 of chip U9 are used for desorption outlet valve given control; the L + pin of the chip U9 is connected with 24V, and the M pin of the chip U9 is connected with 0V;

the point heating module comprises a three-phase power supply, wherein a 1L1 wire, a 1L2 wire and a 1L3 wire of the three-phase power supply are connected with one end of a breaker QF12, one end of a breaker QF13 and one end of a breaker QF14, the other end of the breaker QF12 is connected with one end of a contactor KM26, and the other end of the contactor KM26 is connected with a heating rod JR7 and a heating rod JR 8; the other end of the breaker QF13 is connected with one end of a contactor KM27, and the other end of the contactor KM27 is connected with a heating rod JR9 and a heating rod JR 10; the other end of the breaker QF14 is connected with one end of a contactor KM28, and the other end of the contactor KM28 is connected with a heating rod JR11, a heating rod JR12, a heating rod JR13 and a heating rod JR 14.

By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

1. the energy-saving and environment-friendly heating device has the advantages that energy is saved, compared with natural gas heating, the energy is not wasted, and the heating effect can be achieved;

2. the structure is simple, natural gas heating can be replaced by controlling the electric heating rod by the contactor, and the complex process is simplified without specially contacting related manufacturers for inspection and installation;

3. the electric heating treatment is realized by directly adding a contactor in the electric control cabinet through PLC control, and a separate natural gas heating process is not needed;

4. the cost is low, the expected heating effect can be achieved by adopting the heating control mode, the gas source and the post-maintenance treatment required in the natural gas heating process are replaced, and the cost is greatly reduced;

5. the thermal efficiency is fast, compared with other energy sources, the thermal efficiency of coal is about 12-20%, the thermal efficiency of liquid fuel is about 20-40%, the thermal efficiency of gas fuel is about 50-60%, the thermal efficiency of steam is about 45-60%, and the thermal efficiency of electric energy is about 50-95%;

6. the electric heating has strong controllability, and is easy to realize automatic temperature control and remote temperature regulation.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 to 3 are schematic diagrams of a main control module of the control system according to the present invention;

FIGS. 4-12 are PLC module schematic diagrams of the control system of the present invention;

FIG. 13 is a schematic view of an electrical heating module of the control system of the present invention.

Detailed Description

Embodiment 1, a safe, simple and conveniently controlled all-in-one machine heating control system comprises a main control module, a PLC module and an electric heating module; the PLC module comprises a controllable programmer, a digital input/output module, an analog input module and an analog output module; the controllable programmer comprises a chip U1 to a chip U5, the models of the chip U1 to the chip U5 are SR60, the digital input and output module comprises a chip U6, the model of the chip U6 is EM-DR 32-1, the analog input module comprises a chip U7 and a chip U8, the models of the chip U7 and the chip U8 are EM-AE08, the analog output module comprises a chip U9, and the model of the chip U9 is EM-AQ 02.

As shown in fig. 1, the master control module includes a three-phase power supply, wherein 1L1 line, 1L2 line and 1L3 line of the three-phase power supply are connected with one end of a breaker QF1, the other end of the breaker QF1, 6 pins of the breaker QF1 and 1N line of the three-phase power supply are connected with one end of a leakage breaker QF2, one end of a breaker QF3, one end of a breaker QF4 and one end of a breaker QF6, the other end of the leakage breaker QF2 is connected with 1 pin and 2 pin of a socket XS1 and 1 pin and 2 pin of a socket XS2, and a PE pin of the socket XS1 is grounded; the other end of the breaker QF3 is connected with one end of a direct current power supply DC1 and an L pin and an N pin of a PLC power supply, and the other end of the direct current power supply DC1 is connected with 24V and 0V; the other end of the breaker QF4 is connected with an L1 pin and an N1 pin of an electric executive power supply; the other end of the breaker QF6 is connected with an air conditioner EL3 and an EL 4; the 1L3 line of the three-phase power supply is connected with one end of a breaker QF5, the other end of the breaker QF5 is connected with one end of a temperature controller ST3, the other end of the temperature controller ST3 is connected with one end of a fan MF21, and the other end of the fan MF21 is connected with the 1N line of the three-phase power supply.

As shown in fig. 2, the 1L1 line, the 1L2 line and the 1L3 line of the three-phase power supply of the main control module are connected with one end of a breaker QF7, the other end of the breaker QF7 is connected with one end of a breaker QF8, one end of a breaker QF9 and one end of a breaker QF10, the other end of the breaker QF8 is connected with one end of a contactor KM1 switch and one end of a relay KA17 switch, the other end of the contactor KM1 switch is connected with a heating rod JR1, the other end of the relay KA17 switch is connected with one end of a contactor KM1 coil, the other end of the contactor KM1 coil is connected with the 1N line of the three-phase power supply, the other end of the breaker QF9 is connected with one end of a contactor KM2 switch and one end of the relay KA18 switch, the other end of the contactor KM 18 switch is connected with a heating rod JR 18, the other end of the relay KA18 switch is connected, the other end of the switch of the contactor KM3 is connected with a heating rod JR3, the other end of the switch of the relay KA19 is connected with one end of a coil of the contactor KM3, and the other end of the coil of the contactor KM3 is connected with a 1N wire of a three-phase power supply.

As shown in fig. 3, lines 1L1, 1L2 and 1L3 of the three-phase power supply of the main control module are connected with one end of a breaker QF11, the other end of the breaker QF11 is connected with one end of a breaker QF12, one end of a breaker QF13 and one end of a breaker QF14, the other end of the breaker QF12 is connected with one end of a switch of a contactor KM6 and one end of a switch of a relay KA20, the other end of the switch of the contactor KM6 is connected with a heating rod JR4, the other end of the switch of the relay KA20 is connected with one end of a coil of a contactor KM6, and; the other end of the breaker QF13 is connected with one end of a contactor KM7 switch and one end of a relay KA21 switch, the other end of the contactor KM7 switch is connected with a heating rod JR5, the other end of the relay KA21 switch is connected with one end of a contactor KM7 coil, and the other end of the contactor KM7 coil is connected with a 1N wire of a three-phase power supply; the other end of the breaker QF14 is connected with one end of a contactor KM8 switch and one end of a relay KA22 switch, the other end of the contactor KM8 switch is connected with a heating rod JR6, the other end of the relay KA22 switch is connected with one end of a contactor KM8 coil, and the other end of the contactor KM8 coil is connected with a 1N wire of a three-phase power supply.

As shown in fig. 4, the DIa area 0 pin of the chip U1 is connected with one end of a stop switch SB1, and the other end of the stop switch SB1 is connected with 24V; a foot 1 of a DIa area of the chip U1 is connected with one end of a change-over switch SA1, and the other end of the change-over switch SA1 is connected with 24V; a2 pin of a DIa area of the chip U1 is connected with one end of a switch of a contactor KM1, and the other end of the switch of the contactor KM1 is connected with 24V; the 3 feet of the DIa area of the chip U1 is connected with one end of a reset button SB2, and the other end of the reset button SB2 is connected with 24V; the DIa region 4 pin of the chip U1 is connected with one end of a contactor KM2 switch, and the other end of the contactor KM2 switch is connected with 24V; the foot 5 of the DIa area of the chip U1 is connected with one end of a reset button SB4, and the other end of the reset button SB4 is connected with 24V; the DIa region 6 pin of the chip U1 is connected with one end of a reset button SB5, and the other end of the reset button SB5 is connected with 24V; a foot 7 in a DIa region of the chip U1 is connected with one end of a switch of a contactor KM3, and the other end of the switch of the contactor KM3 is connected with 24V; a pin 0 in the Dib area of the chip U1 is connected with one end of an air source pressure gauge SP1, a pin 1 of the air source pressure gauge SP1 is connected with 24V, and a pin 2 of the air source pressure gauge SP1 is connected with 0V; pin 1 of the DIb area of the chip U1 is used for controlling the operation of the main fan; pin 2 of the DIb region of the chip U1 is used for controlling the fault of the main fan; the 3 feet of the DIb area of the chip U1 are connected with one end of a pressure relay PS001, and the other end of the pressure relay PS001 is connected with 24V; the 4 feet of the DIb area of the chip U1 are connected with one end of a contactor KM4 switch, and the other end of the contactor KM4 switch is connected with 24V; the 5 pins of the DIb area of the chip U1 are used for the operation control of the rotating wheel; the 6 pins of the DIb region of chip U1 are used for reel fault control; the 7-pin DIb region of chip U1 is used for jog wheel origin control.

As shown in fig. 5, a pin 0 in the DIc area of the chip U2 is used for controlling the operation of the adsorption fan; the DIc area 1 pin of the chip U2 is used for controlling the fault of the fan by the wife; a pin 2 in a DIc area of the chip U2 is connected with one end of a pressure relay PS002, and the other end of the pressure relay PS002 is connected with 24V; a pin 3 in a DIc region of the chip U2 is connected with one end of a switch of a contactor KM5, the other end of the switch of the contactor KM5 is connected with 24V, a pin 4 in a DIc region of the chip U2 is connected with one end of a switch of a contactor KM6, and the other end of the contactor KM6 is connected with 24V; a pin 5 in a DIc area of the chip U2 is used for controlling the opening position of a spray valve; DIc zone 6 of chip U2 is used for shower valve closing in-place control; the pin 0 in the DId area of the chip U2 is used for controlling the opening position of the fresh air valve; a pin DId area 1 of the chip U2 is used for controlling the closing position of a fresh air valve; a pin 2 in a DId area of the chip U2 is used for controlling the fault of the hot air proportional valve; the pin DId and 3 of the chip U2 is used for desorption outlet valve fault control; the DId area 4 pin of the chip U2 is used for purging valve fault control; the 5 feet of the DId area of the chip U2 are connected with one end of a pressure relay PS3, and the other end of the pressure relay PS3 is connected with 24V; the 6 feet of the DId area of the chip U2 are connected with one end of a pressure relay PS4, and the other end of the pressure relay PS4 is connected with 24V; the 7 feet of the DId area of the chip U2 are connected with one end of a pressure relay PS5, and the other end of the pressure relay PS5 is connected with 24V.

As shown in fig. 6, the pin 0 of the DIc zone of the chip U3 is connected with one end of a pressure relay PS5, and the other end of the pressure relay PS5 is connected with 24V; a1 pin of a DIc area of the chip U3 is connected with one end of a switch of a contactor KM6, and the other end of the switch of the contactor KM6 is connected with 24V; a pin 2 in a DIc area of the chip U3 is connected with one end of a switch of a contactor KM7, and the other end of the switch of the contactor KM7 is connected with 24V; the 3 feet of the DIc area of the chip U3 are connected with one end of a switch of a contactor KM8, and the other end of the switch of the contactor KM8 is connected with 24V.

As shown in fig. 7, the 1L pin, the 2L pin and the 3L pin of the chip U4 are connected with 24V, the 1 pin of the chip U4 is connected with one end of a coil of a relay KA1, and the other end of the coil of the relay KA1 is connected with 0V, and the part is used for operation control; the 2 pin of the chip U4 is connected with one end of a coil of a relay KA2, the other end of the coil of the relay KA2 is connected with 0V, and the part is used for fault control; the 3 feet of the chip U4 are connected with one end of a coil of a relay KA3, and the other end of the coil of the relay KA3 is connected with 0V; the 4 feet of the chip U4 are connected with one end of a coil of a relay KA4, and the other end of the coil of the relay KA4 is connected with 0V; the 5-pin of the chip U4 is connected with one end of a coil of a relay KA5, and the other end of the coil of the relay KA5 is connected with 0V, and the part is used for automatic indication control.

The 6 pins of the chip U4 are connected with one end of a coil of a relay KA6, and the other end of the coil of the relay KA6 is connected with 0V; the 7 feet of the chip U4 are connected with one end of a coil of a relay KA7, the other end of the coil of the relay KA7 is connected with 0V, and the part is used for controlling the opening of a fresh air valve; the 8 feet of the chip U4 are connected with one end of a coil of a relay KA8, the other end of the coil of the relay KA8 is connected with 0V, and the part is used for closing control of a fresh air valve; a pin 9 of the chip U4 is connected with one end of a coil of a relay KA9, the other end of the coil of the relay KA9 is connected with 0V, and the part is used for starting control of the main fan; the 10 feet of the chip U4 are connected with one end of a coil of a relay KA10, the other end of the coil of the relay KA10 is connected with 0V, and the part is used for main fan reset control.

As shown in fig. 8, the pins 1L, 2L and 3L of the chip U5 are connected with 24V, the pin 1 of the chip U5 is connected with one end of a coil of a relay KA17, the other end of the coil of the relay KA17 is connected with 0V, and the part is used for primary heating in a desorption area; the 2 pin of the chip U5 is connected with one end of a coil of a relay KA18, the other end of the coil of the relay KA18 is connected with 0V, and the part is used for secondary heating of a desorption area; the 3 feet of the chip U5 are connected with one end of a coil of a relay KA19, the other end of the coil of the relay KA19 is connected with 0V, and the part is used for three-stage heating of a desorption area; the 4 feet of the chip U5 are connected with one end of a coil of a relay KA20, the other end of the coil of the relay KA20 is connected with 0V, and the part is used for primary heating of the CO furnace; the 5 feet of the chip U5 are connected with one end of a coil of a relay KA21, the other end of the coil of the relay KA21 is connected with 0V, and the part is used for secondary heating of the CO furnace; the 6 feet of the chip U5 are connected with one end of a coil of a relay KA22, the other end of the coil of the relay KA22 is connected with 0V, and the part is used for three-stage heating of the CO furnace.

As shown in fig. 9, the pins 1L and 2L of the chip U6 are connected with 24V, the pin 0 of the chip U6 is connected with one end of the coil of the relay KA33, and the other end of the coil of the relay KA33 is connected with 0V; a pin 1 of the chip U6 is connected with one end of a coil of a relay KA34, and the other end of the coil of the relay KA34 is connected with 0V; pins 2 and 3 of chip U6 are connected to 0V.

As shown in fig. 10, the L + pin of the chip U7 is connected with 24V, the M pin of the chip U7 is connected with 0V, and the 0+ pin, the 0-pin, the 1+ pin and the 1-pin of the chip U7 are used for controlling the temperature of the furnace chamber; the 2+ leg and the 2-leg of chip U7 are used for exhaust inlet temperature control; the 3+ and 3-pins of chip U7 are used for cooling outlet temperature control; the 4+ pin and the 4-pin of the chip U7 are used for controlling the temperature of the adsorption outlet; the 5+ leg and the 5-leg of the chip U7 are used for desorption inlet temperature control; the 6+ pin and the 6-pin of the chip U7 are used for desorption outlet temperature control; the 7+ leg and the 7-leg of chip U7 are used for furnace exit temperature control.

As shown in fig. 11, the L + pin of the chip U8 is 24V, the M pin of the chip U8 is 0V, and the 0+ pin and the 0-pin of the chip U8 are used for heat exchanger inlet temperature control; the 1+ pin and the 1-pin of the chip U8 are used for controlling the temperature of the outlet of the heat exchanger; the 2+ pin and the 2-pin of the chip U8 are used for controlling the pressure of the hearth; the 4+ pin and the 4-pin of the chip U8 are used for feedback control of the hot air proportional valve; the 5+ pin and the 5-pin of the chip U8 are used for feedback control of a desorption outlet valve; the 6+ pin and 6-pin of chip U8 are used for purge valve feedback control.

As shown in fig. 12, the pin 0M and the pin 0M of the chip U9 are used for the frequency control of the wheel motor; pins 1M and 1 of chip U9 are used for purge valve given control; the 2M pin and the 2 pin of the chip U9 are used for given control of a hot air proportional valve; pins 3M and 3 of chip U9 are used for desorption outlet valve given control; the L + pin of the chip U9 is connected to 24V, and the M pin of the chip U9 is connected to 0V.

As shown in fig. 13, the spot heating module includes a three-phase power supply, wherein a 1L1 line, a 1L2 line and a 1L3 line of the three-phase power supply are connected with one end of a breaker QF12, one end of the breaker QF13 and one end of a breaker QF14, the other end of the breaker QF12 is connected with one end of a contactor KM26, and the other end of the contactor KM26 is connected with a heating rod JR7 and a heating rod JR 8; the other end of the breaker QF13 is connected with one end of a contactor KM27, and the other end of the contactor KM27 is connected with a heating rod JR9 and a heating rod JR 10; the other end of the breaker QF14 is connected with one end of a contactor KM28, and the other end of the contactor KM28 is connected with a heating rod JR11, a heating rod JR12, a heating rod JR13 and a heating rod JR 14.

The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A safe, simple and convenient-to-control all-in-one machine heating control system is characterized by comprising a main control module, a PLC module and an electric heating module; the PLC module comprises a controllable programmer, a digital input/output module, an analog input module and an analog output module; the controllable programmer comprises a chip U1 to a chip U5, the models of the chip U1 to the chip U5 are SR60, the digital input and output module comprises a chip U6, the model of the chip U6 is EM-DR 32-1, the analog input module comprises a chip U7 and a chip U8, the models of the chip U7 and the chip U8 are EM-AE08, the analog output module comprises a chip U9, and the model of the chip U9 is EM-AQ 02.

2. A safe, simple and easy to control all-in-one heating control system as claimed in claim 1, wherein: the main control module comprises a three-phase power supply, wherein 1L1 wires, 1L2 wires and 1L3 wires of the three-phase power supply are connected with one end of a breaker QF1, the other end of the breaker QF1, 6 pins of the breaker QF1 and 1N wires of the three-phase power supply are connected with one end of a leakage breaker QF2, one end of a breaker QF3, one end of a breaker QF4 and one end of a breaker QF6, the other end of the leakage breaker QF2 is connected with 1 pin and 2 pin of a socket XS1 and 1 pin and 2 pin of the socket XS2, and a PE pin of the socket XS1 is grounded; the other end of the breaker QF3 is connected with one end of a direct current power supply DC1 and an L pin and an N pin of a PLC power supply, and the other end of the direct current power supply DC1 is connected with 24V and 0V; the other end of the breaker QF4 is connected with an L1 pin and an N1 pin of an electric executive power supply; the other end of the breaker QF6 is connected with an air conditioner EL3 and an EL 4; the 1L3 line of the three-phase power supply is connected with one end of a breaker QF5, the other end of the breaker QF5 is connected with one end of a temperature controller ST3, the other end of the temperature controller ST3 is connected with one end of a fan MF21, and the other end of the fan MF21 is connected with the 1N line of the three-phase power supply.

3. A safe, simple and easy to control all-in-one heating control system as claimed in claim 1, wherein: the other end of the switch of the contactor KM1 is connected with a heating rod JR1, the other end of the switch of the relay KA17 is connected with one end of a coil of a contactor KM1, the other end of the coil of the contactor KM1 is connected with the 1N line of the three-phase power supply, the other end of the switch of the contactor KM 9 is connected with one end of a switch of the contactor KM2 and one end of a switch of the relay KA18, the other end of the switch of the contactor KM 18 is connected with one end of a heating rod JR 18, the other end of the switch of the relay KA18 is connected with one end of a coil of the contactor KM 18, the other end of the coil of the contactor KM 18 is connected with the 1N line of the three-phase power supply, the other end of the contactor QF 18 is connected with one end of a switch of the contactor KM 18 and one end of the switch of the relay KA18, the other end of the switch of the contactor KM3 is connected with a heating rod JR3, the other end of the switch of the relay KA19 is connected with one end of a coil of the contactor KM3, and the other end of the coil of the contactor KM3 is connected with a 1N wire of a three-phase power supply.

4. A safe, simple and easy to control all-in-one heating control system as claimed in claim 1, wherein: the main control module comprises a main control module, a main control module and a relay, wherein 1L1 lines, 1L2 lines and 1L3 lines of a three-phase power supply of the main control module are connected with one end of a breaker QF11, the other end of the breaker QF11 is connected with one end of a breaker QF12, one end of a breaker QF13 and one end of a breaker QF14, the other end of the breaker QF12 is connected with one end of a switch of a contactor KM6 and one end of a switch of a relay KA20, the other end of the switch of the contactor KM6 is connected with a heating rod JR4, the other end of the switch of; the other end of the breaker QF13 is connected with one end of a contactor KM7 switch and one end of a relay KA21 switch, the other end of the contactor KM7 switch is connected with a heating rod JR5, the other end of the relay KA21 switch is connected with one end of a contactor KM7 coil, and the other end of the contactor KM7 coil is connected with a 1N wire of a three-phase power supply; the other end of the breaker QF14 is connected with one end of a contactor KM8 switch and one end of a relay KA22 switch, the other end of the contactor KM8 switch is connected with a heating rod JR6, the other end of the relay KA22 switch is connected with one end of a contactor KM8 coil, and the other end of the contactor KM8 coil is connected with a 1N wire of a three-phase power supply.

5. A safe, simple and easy to control all-in-one heating control system as claimed in claim 1, wherein: a foot 0 of the DIa area of the chip U1 is connected with one end of a stop switch SB1, and the other end of the stop switch SB1 is connected with 24V; a foot 1 of a DIa area of the chip U1 is connected with one end of a change-over switch SA1, and the other end of the change-over switch SA1 is connected with 24V; a2 pin of a DIa area of the chip U1 is connected with one end of a switch of a contactor KM1, and the other end of the switch of the contactor KM1 is connected with 24V; the 3 feet of the DIa area of the chip U1 is connected with one end of a reset button SB2, and the other end of the reset button SB2 is connected with 24V; the DIa region 4 pin of the chip U1 is connected with one end of a contactor KM2 switch, and the other end of the contactor KM2 switch is connected with 24V; the foot 5 of the DIa area of the chip U1 is connected with one end of a reset button SB4, and the other end of the reset button SB4 is connected with 24V; the DIa region 6 pin of the chip U1 is connected with one end of a reset button SB5, and the other end of the reset button SB5 is connected with 24V; a foot 7 in a DIa region of the chip U1 is connected with one end of a switch of a contactor KM3, and the other end of the switch of the contactor KM3 is connected with 24V; a pin 0 in the Dib area of the chip U1 is connected with one end of an air source pressure gauge SP1, a pin 1 of the air source pressure gauge SP1 is connected with 24V, and a pin 2 of the air source pressure gauge SP1 is connected with 0V; pin 1 of the DIb area of the chip U1 is used for controlling the operation of the main fan; pin 2 of the DIb region of the chip U1 is used for controlling the fault of the main fan; the 3 feet of the DIb area of the chip U1 are connected with one end of a pressure relay PS001, and the other end of the pressure relay PS001 is connected with 24V; the 4 feet of the DIb area of the chip U1 are connected with one end of a contactor KM4 switch, and the other end of the contactor KM4 switch is connected with 24V; the 5 pins of the DIb area of the chip U1 are used for the operation control of the rotating wheel; the 6 pins of the DIb region of chip U1 are used for reel fault control; the 7-pin DIb region of chip U1 is used for jog wheel origin control.

6. A safe, simple and easy to control all-in-one heating control system as claimed in claim 1, wherein: a pin 0 in a DIc area of the chip U2 is used for controlling the operation of the adsorption fan; the DIc area 1 pin of the chip U2 is used for controlling the fault of the fan by the wife; a pin 2 in a DIc area of the chip U2 is connected with one end of a pressure relay PS002, and the other end of the pressure relay PS002 is connected with 24V; a pin 3 in a DIc region of the chip U2 is connected with one end of a switch of a contactor KM5, the other end of the switch of the contactor KM5 is connected with 24V, a pin 4 in a DIc region of the chip U2 is connected with one end of a switch of a contactor KM6, and the other end of the contactor KM6 is connected with 24V; a pin 5 in a DIc area of the chip U2 is used for controlling the opening position of a spray valve; DIc zone 6 of chip U2 is used for shower valve closing in-place control; the pin 0 in the DId area of the chip U2 is used for controlling the opening position of the fresh air valve; a pin DId area 1 of the chip U2 is used for controlling the closing position of a fresh air valve; a pin 2 in a DId area of the chip U2 is used for controlling the fault of the hot air proportional valve; the pin DId and 3 of the chip U2 is used for desorption outlet valve fault control; the DId area 4 pin of the chip U2 is used for purging valve fault control; the 5 feet of the DId area of the chip U2 are connected with one end of a pressure relay PS3, and the other end of the pressure relay PS3 is connected with 24V; the 6 feet of the DId area of the chip U2 are connected with one end of a pressure relay PS4, and the other end of the pressure relay PS4 is connected with 24V; the 7 feet of the DId area of the chip U2 are connected with one end of a pressure relay PS5, and the other end of the pressure relay PS5 is connected with 24V.

7. A safe, simple and easy to control all-in-one heating control system as claimed in claim 1, wherein: the pin 0 of the DIc area of the chip U3 is connected with one end of a pressure relay PS5, and the other end of the pressure relay PS5 is connected with 24V; a1 pin of a DIc area of the chip U3 is connected with one end of a switch of a contactor KM6, and the other end of the switch of the contactor KM6 is connected with 24V; a pin 2 in a DIc area of the chip U3 is connected with one end of a switch of a contactor KM7, and the other end of the switch of the contactor KM7 is connected with 24V; a pin 3 in a DIc area of the chip U3 is connected with one end of a switch of a contactor KM8, and the other end of the switch of the contactor KM8 is connected with 24V;

the 1L pin and the 2L pin of the chip U6 are connected with 24V, the 0 pin of the chip U6 is connected with one end of a coil of a relay KA33, and the other end of the coil of the relay KA33 is connected with 0V; a pin 1 of the chip U6 is connected with one end of a coil of a relay KA34, and the other end of the coil of the relay KA34 is connected with 0V; pins 2 and 3 of the chip U6 are connected with 0V;

8. A safe, simple and easy to control all-in-one heating control system as claimed in claim 1, wherein: the 1L pin, the 2L pin and the 3L pin of the chip U4 are connected with 24V, the 1 pin of the chip U4 is connected with one end of a coil of a relay KA1, the other end of the coil of the relay KA1 is connected with 0V, and the part is used for operation control; the 2 pin of the chip U4 is connected with one end of a coil of a relay KA2, the other end of the coil of the relay KA2 is connected with 0V, and the part is used for fault control; the 3 feet of the chip U4 are connected with one end of a coil of a relay KA3, and the other end of the coil of the relay KA3 is connected with 0V; the 4 feet of the chip U4 are connected with one end of a coil of a relay KA4, and the other end of the coil of the relay KA4 is connected with 0V; the 5-pin of the chip U4 is connected with one end of a coil of a relay KA5, the other end of the coil of the relay KA5 is connected with 0V, and the part is used for automatic indication control; the 6 feet of the chip U4 are connected with one end of a coil of a relay KA6, and the other end of the coil of the relay KA6 is connected with 0V; the 7 feet of the chip U4 are connected with one end of a coil of a relay KA7, the other end of the coil of the relay KA7 is connected with 0V, and the part is used for controlling the opening of a fresh air valve; the 8 feet of the chip U4 are connected with one end of a coil of a relay KA8, the other end of the coil of the relay KA8 is connected with 0V, and the part is used for closing control of a fresh air valve; a pin 9 of the chip U4 is connected with one end of a coil of a relay KA9, the other end of the coil of the relay KA9 is connected with 0V, and the part is used for starting control of the main fan; a pin 10 of the chip U4 is connected with one end of a coil of a relay KA10, the other end of the coil of the relay KA10 is connected with 0V, and the part is used for reset control of the main fan;

9. A safe, simple and easy to control all-in-one heating control system as claimed in claim 1, wherein: the 1L pin, the 2L pin and the 3L pin of the chip U5 are connected with 24V, the 1 pin of the chip U5 is connected with one end of a coil of a relay KA17, the other end of the coil of the relay KA17 is connected with 0V, and the part is used for primary heating of a desorption area; the 2 pin of the chip U5 is connected with one end of a coil of a relay KA18, the other end of the coil of the relay KA18 is connected with 0V, and the part is used for secondary heating of a desorption area; the 3 feet of the chip U5 are connected with one end of a coil of a relay KA19, the other end of the coil of the relay KA19 is connected with 0V, and the part is used for three-stage heating of a desorption area; the 4 feet of the chip U5 are connected with one end of a coil of a relay KA20, the other end of the coil of the relay KA20 is connected with 0V, and the part is used for primary heating of the CO furnace; the 5 feet of the chip U5 are connected with one end of a coil of a relay KA21, the other end of the coil of the relay KA21 is connected with 0V, and the part is used for secondary heating of the CO furnace; the 6 feet of the chip U5 are connected with one end of a coil of a relay KA22, the other end of the coil of the relay KA22 is connected with 0V, and the part is used for three-stage heating of the CO furnace;

10. A safe, simple and easy to control all-in-one heating control system as claimed in claim 1, wherein: the L + pin of the chip U8 is connected with 24V, the M pin of the chip U8 is connected with 0V, and the 0+ pin and the 0-pin of the chip U8 are used for controlling the inlet temperature of the heat exchanger; the 1+ pin and the 1-pin of the chip U8 are used for controlling the temperature of the outlet of the heat exchanger; the 2+ pin and the 2-pin of the chip U8 are used for controlling the pressure of the hearth; the 4+ pin and the 4-pin of the chip U8 are used for feedback control of the hot air proportional valve; the 5+ pin and the 5-pin of the chip U8 are used for feedback control of a desorption outlet valve; the 6+ pin and the 6-pin of the chip U8 are used for feedback control of the purge valve;

the pin 0M and the pin 0M of the chip U9 are used for controlling the frequency of the rotary wheel motor; pins 1M and 1 of chip U9 are used for purge valve given control; the 2M pin and the 2 pin of the chip U9 are used for given control of a hot air proportional valve; pins 3M and 3 of chip U9 are used for desorption outlet valve given control; the L + pin of the chip U9 is connected with 24V, and the M pin of the chip U9 is connected with 0V;