A biosafety laboratory material automatic transmission equipment and operation control method

Abstract

The present invention proposes a biosafety laboratory material automatic transmission equipment and operation control method, the biosafety laboratory material automatic transmission equipment, including adjacent laboratories sharing a wall that completely isolates the adjacent laboratories, and also including: a partition wall transmission hole (10) is provided on the shared wall, a conveyor belt located at the bottom of the partition wall transmission hole (10) and extending left and right, and an airtight door (1) arranged in the partition wall transmission hole (10) and dividing the conveyor belt into two to form a two-stage conveyor belt (5); a photoelectric sensor 1 (8) and a photoelectric sensor 2 (11) fixed by a bracket (9) are provided beside the conveyor belt, and the photoelectric sensor 1 (8) and the photoelectric sensor 2 (11) are respectively arranged on both sides of the wall. The present invention maximizes the indoor air safety of the laboratory during the material transmission process, and no one participates in the work of each process in the laboratory, which can avoid the risk of cross infection of personnel.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic transmission, and in particular to an automatic transmission equipment for materials in a biosafety laboratory and an operation control method. Background Art

[0002] Biosafety laboratories are biological laboratories and animal laboratories that can avoid or control the hazards of harmful biological factors being operated and meet biosafety requirements through protective barriers and management measures. Conventional biosafety laboratories in society have problems such as strict site requirements, large demand for professional testing personnel, uneven skill levels of personnel, cumbersome single repetitive operation processes, inconsistent internal monitoring quality control standards, and high risk of cross-infection among personnel. Summary of the invention

[0003] The present invention aims to at least solve the technical problems existing in the prior art, and in particular innovatively proposes an automatic material transmission equipment and an operation control method for a biosafety laboratory.

[0004] In order to achieve the above-mentioned object of the present invention, the present invention provides a biosafety laboratory material automatic transmission equipment, including adjacent laboratories sharing a wall that completely isolates the adjacent laboratories, and also includes:

[0005] A partition wall transmission hole (10) is provided on the common wall, a transmission belt is located at the bottom of the partition wall transmission hole (10) and extends to the left and right, and an airtight door (1) is provided in the partition wall transmission hole (10) and divides the transmission belt into two sections to form a two-section transmission belt (5).

[0006] A photoelectric sensor 1 (8) and a photoelectric sensor 2 (11) fixed by a bracket (9) are arranged beside the conveyor belt. The photoelectric sensor 1 (8) and the photoelectric sensor 2 (11) are arranged on both sides of the wall respectively, and are used to automatically identify whether there is material at the material starting position (6) and the material end position (12) of the two-stage conveyor belt (5), and are linked with the two-stage conveyor belt action mechanism (7); when the photoelectric sensor 1 (8) identifies that there is material at the material starting position (6), the normally open contact 1k changes from an open state to a closed state; the two-stage conveyor belt (5) transports the material from the material starting position (6) to the material end position (12); when the photoelectric sensor 2 (11) identifies that there is material at the material end position (12), the normally closed contact 1k1 changes from a closed state to an open state, and the two-stage conveyor belt (5) stops transporting the material;

[0007] Once the material is placed on the conveyor belt, it can be detected by photoelectric sensor 1 (8).

[0008] The airtight door (1) is driven to operate by an airtight door motor (1) through an airtight door control circuit controlling the airtight door.

[0009] Furthermore, ultraviolet sterilization lamps (4) are arranged on the upper side, left side and right side of both ends of the aperture of the partition wall transmission hole (10), and an air curtain machine (3) is arranged above the aperture end of the partition wall transmission hole (10) where the air pressure is high, i.e., above the side of the material starting position; the air curtain machine (3) is used for air isolation, and plays a role of double isolation on the basis of isolating the high-pressure room to the low-pressure room.

[0010] Furthermore, the conveyor belt is a two-stage conveyor belt (5), which is respectively arranged on both sides of the wall;

[0011] The conveyor belt comprises: a two-stage conveyor belt actuating mechanism (7) arranged below the two-stage conveyor belt (5) and a two-stage conveyor belt bracket (13).

[0012] Furthermore, the airtight door (1) is equipped with a limit switch to protect the safety of the motor of the airtight door (1); the airtight door (1) and the two-stage conveyor belt (5) are both equipped with control buttons that can forcibly change the working state.

[0013] Furthermore, the connection between the airtight door (1) and the partition wall transmission hole (10) is made of polyurethane rubber material to ensure the airtightness of the airtight door (1) when it is closed.

[0014] The present invention also provides a biosafety laboratory material automatic transmission equipment and operation control method, comprising the following steps:

[0015] S1, after the material automatic transmission equipment is completely installed at the designated position, the ultraviolet sterilization lamp 4 is always turned on after the laboratory starts to operate;

[0016] S2, when the photoelectric sensor 1 (8) detects that there is material at the material starting position (6), the two-stage conveyor belt action mechanism (7) is turned on, and the two-stage conveyor belt (5) starts to move and start to convey the material;

[0017] S3, after the airtight door controller (2) and the relay in the air curtain machine (3) receive the opening signal from the two-stage transmission belt actuating mechanism (7), the airtight door (1) and the air curtain machine (3) are controlled to open;

[0018] S4, when the photoelectric sensor 2 (10) detects that there is material at the material end position (11), the two-stage conveyor belt action mechanism (7) is closed, the two-stage conveyor belt (5) stops moving, and the airtight door (1) and the air curtain machine (3) are closed in conjunction.

[0019] Furthermore, the two-stage transmission belt (5) comprises a transmission belt portion control circuit:

[0020] The first end of the switch ZK is connected to the live wire L, the second end of the switch ZK is connected to the first end of the normally open push button switch SB1, the first end of the normally open contact 1k, and the first end of the first normally open contact KM1, and the second end of the push button switch SB1, the second end of the normally open contact 1k, and the second end of the first normally open contact KM1 are connected to the first end of the normally closed contact 1k1;

[0021] The second end of the normally closed contact 1k1 is connected to the first end of the normally closed push button switch SBS1, the second end of the normally closed push button switch SBS1 is connected to the first end of the contactor KM1, the first end of the second normally open contact KM1, and the first end of the third normally open contact KM1, the second end of the second normally open contact KM1 is connected to the first end of the contactor KM2, and the second end of the third normally open contact KM1 is connected to the first end of the contactor KM3; the second end of the contactor KM1, the second end of the contactor KM2, and the second end of the contactor KM3 are connected to the neutral line N.

[0022] Furthermore, the airtight door (1) comprises an airtight door control circuit:

[0023] A first end of the live wire master switch LK is connected to the live wire L, a second end of the live wire master switch LK is connected to a first end of the normally closed switch SBS2, a second end of the normally closed switch SBS2 is connected to a first end of the first normally open contact KM4, a first end of the first normally open contact KM3, a first end of the first normally closed contact KM3, and a first end of the first normally open contact KM5, and a second end of the first normally open contact KM3 is connected to a first end of the second normally open contact KM5;

[0024] The second end of the first normally open contact KM4 and the second end of the second normally open contact KM5 are connected to the first end of the normally closed limit switch contact SQ1, and the second end of the normally closed limit switch contact SQ1 is connected to the first end of the contactor KM4;

[0025] The second end of the first normally closed contact KM3 and the second end of the first normally open contact KM5 are connected to the first end of the normally closed limit switch contact SQ2, the second end of the normally closed limit switch contact SQ2 is connected to the first end of the first normally closed contact KM4, and the second end of the first normally closed contact KM4 is connected to the first end of the contactor KM5;

[0026] The second end of the contactor KM4 and the second end of the contactor KM5 are connected to the second end of the neutral line main switch NK, and the first end of the neutral line main switch NK is connected to the neutral line N;

[0027] The first end of the L pole of the normally open bipolar switch KM4 is connected to the second end of the live wire main switch LK, the first end of the N pole of the normally open bipolar switch KM4 is connected to the second end of the neutral wire main switch NK, and the second end of the L pole of the normally open bipolar switch KM4 is connected to the first end of the capacitor and the first end of the airtight door (1) motor.

[0028] The second end of the capacitor is connected to the second end of the airtight door (1) motor and the first end of the L pole of the normally closed bipolar switch KM5. The third end of the airtight door (1) motor is connected to the second end of the N pole of the normally open bipolar switch KM4 and the first end of the N pole of the normally closed bipolar switch KM5. The second end of the N pole of the normally closed bipolar switch KM5 is connected to the live wire L, and the second end of the N pole of the normally closed bipolar switch KM5 is connected to the second end of the neutral line main switch NK.

[0029] Furthermore, a normally closed switch SBS3 is connected between the second end of the first normally open contact KM4, the second end of the first normally open contact KM5 and the first end of the normally closed limit switch contact SQ1; and a linkage normally open switch SBS31 of the normally closed switch SBS3 is connected in parallel to the first normally open contact KM5;

[0030] A normally closed switch SBS4 is connected between the second end of the first normally closed contact KM3, the second end of the second normally open contact KM5 and the first end of the normally closed limit switch contact SQ2, and a linked normally open switch SBS41 connected in parallel with the normally closed switch SBS4 is connected to the first normally open contact KM4.

[0031] The normally closed switch SBS3 and the normally closed switch SBS4 are used as control buttons for forcibly controlling the opening and closing of the airtight door (1).

[0032] In summary, due to the adoption of the above technical solutions, the present invention realizes the automatic transmission of materials in different spaces by designing a set of cross-regional automatic material transmission equipment. In terms of energy saving, the automatic start and stop of the material conveyor belt can be realized on demand through automated control means. In terms of safety, by setting automatic airtight doors, air curtain machines, and ultraviolet sterilization lamps, the indoor air safety of the laboratory during the material transmission process is guaranteed to the maximum extent under the premise of realizing automatic material transmission, and no one is involved in the work of each process in the laboratory, which can avoid the risk of cross-infection of personnel. Thereby, a mobile, high-throughput, automated, intelligent, and unmanned biosafety laboratory that can be quickly deployed with a rapid deployment function is realized.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0036] Figure 2 It is a schematic diagram of the main structure of the present invention.

[0037] Figure 3 It is the work flow chart of the present invention.

[0038] Figure 4 This is a partial control schematic diagram of the two-stage transmission belt of the present invention.

[0039] Figure 5 This is a schematic diagram of the airtight door control principle of the present invention.

[0040] Figure 6 This is the control principle diagram of the air curtain machine of the present invention.

[0041] In the figure: 1-airtight door; 2-airtight door controller; 3-air curtain machine; 4-ultraviolet sterilization lamp; 5-two-stage conveyor belt; 6-material starting position; 7-two-stage conveyor belt action mechanism; 8-photoelectric sensor 1; 9-bracket; 10-partition wall transmission hole; 11-photoelectric sensor 2; 12-material end position; 13-two-stage conveyor belt bracket. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] like Figure 1-2 As shown, a biosafety laboratory material automatic transmission equipment includes: a partition wall transmission hole 10, a two-stage conveyor belt 5, an airtight door 1, an airtight door controller 2, an air curtain machine 3, an ultraviolet sterilization lamp 4, a material starting position 6, a two-stage conveyor belt action mechanism 7, a photoelectric sensor 1 8, a bracket 9, a photoelectric sensor 2 11, and a material end position 12. The partition wall transmission hole 10 determines the opening size and the opening position on the laboratory partition wall according to needs, the two-stage conveyor belt 5 is installed through the partition wall transmission hole 10, the two-stage conveyor belt 5 is located at the bottom of the partition wall transmission hole 10, and the airtight door 1 is embedded in the installation It is installed in the partition wall transmission hole 10 and is linked to the two-stage conveyor belt action mechanism 7 through the airtight door controller 2. The air curtain machine 3 is installed above the partition wall transmission hole 10 (on the side of the material starting position) and is linked to the two-stage conveyor belt action mechanism 7. The ultraviolet sterilization lamp 4 is installed on the upper side, left side and right side of both ends of the partition wall transmission hole 10. The top of the bracket 9 is installed with a photoelectric sensor 1 8 and a photoelectric sensor 2 11. The photoelectric sensor 1 8 and the photoelectric sensor 2 11 automatically identify the material information of the material starting position 6 and the material end position 12 of the two-stage conveyor belt 5, and are linked to the two-stage conveyor belt action mechanism 7.

[0044] The airtight door 1 is equipped with a limit switch to protect the safety of the motor of the airtight door 1; in order to facilitate maintenance and human intervention, the airtight door 1 and the two-stage conveyor belt 5 are both equipped with control buttons that can forcibly change the working state.

[0045] When the airtight door 1 is closed, the connection between the airtight door 1 and the transmission hole 10 of the partition wall is made of polyurethane rubber material to ensure the airtightness of the airtight door 1 when it is closed.

[0046] like Figure 3 As shown, a method for controlling the operation of automatic material transmission equipment in a biosafety laboratory comprises the following steps:

[0047] S1, system operation;

[0048] S2, the ultraviolet sterilization lamp 4 is normally on, the air curtain machine 3 is closed, the airtight door 1 is closed, the two-stage conveyor belt 5 is closed;

[0049] S3, determine whether there is material at the material starting position 6, if there is material, execute the next step; if there is no material, execute step S3 again;

[0050] S4, the two-stage conveyor belt 5 is turned on;

[0051] S5, air curtain machine 3 is turned on;

[0052] S6, airtight door 1 is opened;

[0053] S7, determine whether there is material at the material end position 12, if there is material, execute the next step; if there is no material, execute step S7 again;

[0054] S8, two-stage conveyor belt 5 closed

[0055] S9, airtight door 1 closed

[0056] S10, air curtain machine 3 is closed

[0057] S11, a single material transfer is completed, and the process jumps to step S3.

[0058] like Figures 4 to 6 As shown, the operation control principle of an automatic material transmission equipment for a biosafety laboratory is as follows:

[0059] Figure 4 This is a partial control principle diagram of the two-stage conveyor belt of the present invention: When the photoelectric sensor 8 detects the material information, the normally open contact 1k automatically closes, the contactor KM1 is energized, and the normally open contact of KM1 automatically closes. When the photoelectric sensor 8 detects the material information, the two-stage conveyor belt action mechanism 7 works, and the two-stage conveyor belt 5 starts to transport the material; at the same time, the contactors KM2 and KM3 are energized, the normally open contact of KM2 automatically closes, the normally open contact of KM3 automatically closes, and the normally closed contact automatically opens;

[0060] When the photoelectric sensor 11 detects the material information, the normally closed contact 1k1 is automatically disconnected, the contactor KM1 loses power, and the KM1 contact returns to its original state. When the photoelectric sensor 11 detects the material information, the two-stage conveyor belt action mechanism 7 stops moving, and the two-stage conveyor belt 5 stops; at the same time, the contactors KM2 and KM3 lose power, and the KM2 and KM3 contacts return to their original states.

[0061] Among them, ZK is the main switch and SB1 is the start switch of the two-stage transmission with manual mode.

[0062] Figure 5 This is the control principle diagram of the airtight door of the present invention: when there is no external signal, that is, when the photoelectric sensor does not detect the material, the contactor KM5 is energized, the normally closed bipolar switch KM5 is in a closed state, the motor of the airtight door 1 works in reverse, and the airtight door 1 starts to move downward and close. When the airtight door 1 moves to the position of the limit switch contact SQ2, the limit switch contact SQ2 is disconnected, the contactor KM5 loses power, the normally open contact of KM5 automatically closes, and the normally closed contact automatically disconnects; the normally closed bipolar switch KM5 becomes disconnected, and the motor of the airtight door 1 stops moving.

[0063] When the photoelectric sensor 8 detects the material information, Figure 4 When the middle contactor KM3 is energized, the normally open contact of KM3 automatically closes and the normally closed contact automatically disconnects; when the contactor KM4 is energized, the normally open bipolar switch KM4 closes, the motor of the airtight door 1 rotates forward, and the airtight door 1 starts to move upward and open. When the airtight door 1 moves to the position of the limit switch contact SQ1, the limit switch contact SQ1 disconnects, the contactor KM4 loses power, the normally open contact of KM4 automatically closes, the normally closed contact automatically disconnects, and the motor of the airtight door 1 stops moving.

[0064] In addition, control buttons SBS3 and SBS4 are provided to forcibly control the opening and closing of the airtight door 1. When the control button SBS3 is pressed, the airtight door 1 changes from forward to reverse rotation; when the control button SBS4 is pressed, the airtight door 1 changes from reverse rotation to forward rotation. SBS2 is an emergency stop switch.

[0065] When the photoelectric sensor 11 detects the material information, Figure 3 The middle contactor KM3 loses power, the normally open contact of KM3 is in the disconnected state, and the normally closed contact is in the closed state; the contactor KM5 is energized, the normally closed bipolar switch KM5 is closed, the airtight door 1 motor reverses, and the airtight door 1 is closed. When the airtight door 1 runs to the position of the limit switch contact SQ2, the limit switch contact SQ2 is disconnected, the contactor KM5 loses power, the normally open contact of KM5 automatically closes, and the normally closed contact automatically disconnects; the normally closed bipolar switch KM5 becomes disconnected, and the airtight door 1 motor stops moving.

[0066] Figure 6This is the control principle diagram of the air curtain machine of the present invention: Figure 3 When the contactor KM2 is powered on, the normally open contact of KM2 is automatically closed, the power supply circuit of air curtain machine 3 is powered on, and air curtain machine 3 is started; when the contactor KM2 loses power, the contact of KM2 returns to its original state, the power supply circuit of air curtain machine 3 loses power, and air curtain machine 3 is turned off. The circuit breakers are all connected first.

[0067] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A biosafety laboratory material automatic transmission equipment, comprising adjacent laboratories sharing a wall that completely isolates the adjacent laboratories, characterized in that: Also includes: A partition wall transmission hole (10) is provided on the common wall, a transmission belt is located at the bottom of the partition wall transmission hole (10) and extends to the left and right, and an airtight door (1) is provided in the partition wall transmission hole (10) and divides the transmission belt into two sections to form a two-section transmission belt (5); ultraviolet sterilization lamps (4) are provided on the upper side, left side, and right side of both ends of the opening of the partition wall transmission hole (10); and an air curtain machine (3) is provided above the opening end of the partition wall transmission hole (10) where the air pressure is high; A photoelectric sensor 1 (8) and a photoelectric sensor 2 (11) fixed by a bracket (9) are arranged beside the conveyor belt. The photoelectric sensor 1 (8) and the photoelectric sensor 2 (11) are arranged on both sides of the wall, respectively, and are used to automatically identify whether there is material at the material starting position (6) and the material end position (12) of the two-stage conveyor belt (5), and are linked with the two-stage conveyor belt action mechanism (7).

2. The automatic material transfer equipment for a biosafety laboratory according to claim 1, characterized in that: The conveyor belt is a two-section conveyor belt (5) which is respectively arranged on two sides of the wall; The conveyor belt comprises: a two-stage conveyor belt actuating mechanism (7) arranged below the two-stage conveyor belt (5) and a two-stage conveyor belt bracket (13).

3. The automatic material transfer equipment for a biosafety laboratory according to claim 1, characterized in that: The airtight door (1) is equipped with a limit switch to protect the safety of the motor of the airtight door (1).

4. The automatic material transfer equipment for a biosafety laboratory according to claim 1, characterized in that: The connection between the airtight door (1) and the partition wall transmission hole (10) is made of polyurethane rubber material.

5. A method for controlling the operation of automatic material transmission equipment in a biosafety laboratory, characterized in that: The following steps are involved: S1, after the material automatic transmission equipment is completely installed at the designated position, the ultraviolet sterilization lamp 4 is always turned on after the laboratory starts to operate; S2, when the photoelectric sensor 1 (8) detects that there is material at the material starting position (6), the two-stage conveyor belt action mechanism (7) is turned on, and the two-stage conveyor belt (5) starts to move and start to transport the material; S3, after the airtight door controller (2) and the air curtain machine (3) receive the opening signal from the two-stage conveyor belt actuating mechanism (7), they control the airtight door (1) and the air curtain machine (3) to open; S4, when the photoelectric sensor 2 (10) detects that there is material at the material end position (11), the two-stage conveyor belt action mechanism (7) is closed, the two-stage conveyor belt (5) stops moving, and the airtight door (1) and the air curtain machine (3) are closed in conjunction.

6. The operation control method of a biosafety laboratory material automatic transmission equipment according to claim 5, characterized in that: The two-stage transmission belt (5) comprises a transmission belt portion control circuit: The first end of the switch ZK is connected to the live wire L, the second end of the switch ZK is connected to the first end of the normally open push button switch SB1, the first end of the normally open contact 1k, and the first end of the first normally open contact KM1, and the second end of the push button switch SB1, the second end of the normally open contact 1k, and the second end of the first normally open contact KM1 are connected to the first end of the normally closed contact 1k1; The second end of the normally closed contact 1k1 is connected to the first end of the normally closed push button switch SBS1, the second end of the normally closed push button switch SBS1 is connected to the first end of the contactor KM1, the first end of the second normally open contact KM1, and the first end of the third normally open contact KM1, the second end of the second normally open contact KM1 is connected to the first end of the contactor KM2, and the second end of the third normally open contact KM1 is connected to the first end of the contactor KM3; the second end of the contactor KM1, the second end of the contactor KM2, and the second end of the contactor KM3 are connected to the neutral line N.

7. The operation control method of the automatic material transmission equipment of a biosafety laboratory according to claim 5 is characterized in that: The airtight door (1) comprises an airtight door control circuit: A first end of the live wire master switch LK is connected to the live wire L, a second end of the live wire master switch LK is connected to a first end of the normally closed switch SBS2, a second end of the normally closed switch SBS2 is connected to a first end of the first normally open contact KM4, a first end of the first normally open contact KM3, a first end of the first normally closed contact KM3, and a first end of the first normally open contact KM5, and a second end of the first normally open contact KM3 is connected to a first end of the second normally open contact KM5; The second end of the first normally open contact KM4 and the second end of the second normally open contact KM5 are connected to the first end of the normally closed limit switch contact SQ1, and the second end of the normally closed limit switch contact SQ1 is connected to the first end of the contactor KM4; The second end of the first normally closed contact KM3 and the second end of the first normally open contact KM5 are connected to the first end of the normally closed limit switch contact SQ2, the second end of the normally closed limit switch contact SQ2 is connected to the first end of the first normally closed contact KM4, and the second end of the first normally closed contact KM4 is connected to the first end of the contactor KM5; The second end of the contactor KM4 and the second end of the contactor KM5 are connected to the second end of the neutral line main switch NK, and the first end of the neutral line main switch NK is connected to the neutral line N; The first end of the L pole of the normally open bipolar switch KM4 is connected to the second end of the live wire main switch LK, the first end of the N pole of the normally open bipolar switch KM4 is connected to the second end of the neutral wire main switch NK, and the second end of the L pole of the normally open bipolar switch KM4 is connected to the first end of the capacitor and the first end of the motor of the airtight door (1). The second end of the capacitor is connected to the second end of the airtight door (1) motor and the first end of the L pole of the normally closed bipolar switch KM5. The third end of the airtight door (1) motor is connected to the second end of the N pole of the normally open bipolar switch KM4 and the first end of the N pole of the normally closed bipolar switch KM5. The second end of the N pole of the normally closed bipolar switch KM5 is connected to the live wire L, and the second end of the N pole of the normally closed bipolar switch KM5 is connected to the second end of the neutral line main switch NK.

8. The operation control method of the automatic material transmission equipment of a biosafety laboratory according to claim 7 is characterized in that: A normally closed switch SBS3 is connected between the second end of the first normally open contact KM4, the second end of the first normally open contact KM5 and the first end of the normally closed limit switch contact SQ1; and a linkage normally open switch SBS31 connected in parallel with the normally closed switch SBS3 is connected to the first normally open contact KM5; A normally closed switch SBS4 is connected between the second end of the first normally closed contact KM3, the second end of the second normally open contact KM5 and the first end of the normally closed limit switch contact SQ2, and a linked normally open switch SBS41 connected in parallel with the normally closed switch SBS4 is connected to the first normally open contact KM4.

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