CN113928474A - Cab structure of bow-stern bidirectional navigation ship - Google Patents
Cab structure of bow-stern bidirectional navigation ship Download PDFInfo
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- CN113928474A CN113928474A CN202111431640.4A CN202111431640A CN113928474A CN 113928474 A CN113928474 A CN 113928474A CN 202111431640 A CN202111431640 A CN 202111431640A CN 113928474 A CN113928474 A CN 113928474A
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- 230000002457 bidirectional effect Effects 0.000 title claims description 6
- 238000004891 communication Methods 0.000 claims abstract description 19
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B15/00—Superstructures, deckhouses, wheelhouses or the like; Arrangements or adaptations of masts or spars, e.g. bowsprits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B19/00—Arrangements or adaptations of ports, doors, windows, port-holes, or other openings or covers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Traffic Control Systems (AREA)
Abstract
The invention discloses a cab structure of a fore-aft bi-directional navigation ship, which comprises a fore-steering cab body and a stern-steering cab body, wherein the fore-steering cab body and the stern-steering cab body are arranged at the topmost layer of an upper building of the ship, one side of the fore-steering cab body is provided with a communicating passageway, one end of the communicating passageway is connected with the stern-steering cab body, the fore-steering cab body, the stern-steering cab body and the communicating passageway are provided with electric suction doors at the communicating positions, and ship control consoles are arranged inside the fore-steering cab body and the stern-steering cab body. The invention forms the cab structure of the fore-and-aft bi-directional navigation ship by the fore cab body and the aft cab body, meets the operation requirement of fore-and-aft bi-directional navigation of the ship, is provided with two control consoles which are mutually independent, simplifies the fore-and-aft bi-directional navigation operation control process of the ship, and is provided with a communication passageway which can facilitate communication and walking of a shipman when the ship alternately navigates between the fore and the aft.
Description
Technical Field
The invention relates to the field of ships, in particular to a cab structure of a bow-stern bidirectional sailing ship.
Background
The conventional ship's cab is usually provided with a control console and window structure only in the direction of the bow or at most to both sides, so that the crew can visually observe the conditions of the bow and both sides of the side. Due to the fact that the width of a part of ships is large, open-air bridge wing platforms are arranged on two sides of a cab, and therefore crews can walk outdoors conveniently to directly observe the ship side condition.
However, some ships are consciously required to make bidirectional fore-and-aft sails during sailing, such as icebreakers sailing in polar regions, cargo ships of autonomous icebreaking type, and some ships requiring high maneuverability. For this type of ship, the existing conventional cab structure is adopted, so that only the situation of the bow can be observed, and when the ship stern sails, a crew cannot directly observe the stern in the cab, which is extremely unfavorable for sailing safety. Therefore, the structure of the cab of the ship capable of sailing fore and aft in both directions needs to be different from the cab of the existing traditional ship.
Disclosure of Invention
The invention aims to provide a cab structure of a ship sailing in two directions from bow to stern, which aims to overcome the defects in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
a cab structure of a bow-stern bidirectional navigation ship comprises a bow-oriented cab body and a stern-oriented cab body, wherein the bow-oriented cab body and the stern-oriented cab body are arranged at the topmost layer of an upper building of the ship, one side of the bow-oriented cab body is provided with a communicating passageway, one end of the communicating passageway is connected with the stern-oriented cab body, the bow-oriented cab body, the stern-oriented cab body and the communicating passageway are provided with electric suction doors at communicating positions, a ship control console ship main control console is arranged inside the bow-oriented cab body, a ship auxiliary control console is arranged inside the bow-oriented cab body, control instrument consoles are arranged on one sides of the tops of the ship main control console and the ship auxiliary control console, a main control computer is arranged on one side of the top of the ship main control console, an auxiliary computer control intervention module and a main computer control intervention module are respectively arranged on one side of the top of the ship main control console, an auxiliary control computer is arranged on one side of the top of the ship auxiliary control console, and a main computer control intervention module and a request control intervention module are respectively arranged on one side of the top of the ship auxiliary control console.
Preferably, the heading cab body and the bridge wings are of a one-piece structure and are of a closed structure, so that the situation that a shipman cannot observe conveniently in the open air in rainy and snowy days is avoided. And safety doors are arranged on the outer walls of one sides of the fore cab body and the stern cab body.
Preferably, the fore cab body and the stern cab body comprise cab outer walls, mounting ports are formed in the outer walls of the cab outer walls and are distributed equidistantly, double-layer observation windows are fixedly arranged on the inner walls of the mounting ports, and anti-corrosion sealing rubber strips are fixedly arranged on the outer walls of the two sides of the double-layer observation windows.
Preferably, the electric suction door comprises a magnetic suction door and an electromagnetic block, the magnetic suction door is of a one-way opening and closing type, an iron-nickel alloy plate is fixedly arranged on one side of the top of the magnetic suction door, the electromagnetic block is fixedly arranged on one side of the bottom of the electric suction door, electromagnetic switches are fixedly arranged on the front side and the rear side of a door frame of the electric suction door, the electromagnetic blocks are electrically connected with the electromagnetic switches through wires, and the electromagnetic switches are connected with power lines.
Preferably, sound insulation materials are coated on the electric suction door, the safety door and the wall surface of the communication passageway, so that the requirement of noise of the ship cabin is met.
Preferably, the length of the communication passageway can be adjusted according to the arrangement positions of the fore and aft cabs, and box-shaped beam structures are arranged on the top and the side of the communication passageway at intervals of the ribs of the ship so as to ensure the strength and the stability of the communication passageway as a ship steel structure.
Preferably, the ship main console and the ship auxiliary console mutually know the operation conditions through monitoring equipment, and radio communication systems are arranged in the ship main console and the ship auxiliary console so as to mutually know the sailing state under the normal condition of an interference-free instrument.
Preferably, the actual operating system of the ship body can be handed over to the auxiliary control computer through the auxiliary computer control intervention module arranged at the top of the ship main control console, the actual operating system of the ship body can be actively switched through the main computer control intervention module arranged at the top of the ship main control console, the actual operation right of the ship body is handed over to the main control computer, the control system of the ship body can be requested to operate by the main control computer through the request control intervention module arranged at the top of the ship auxiliary console, the control system of the ship body is automatically switched to the main control computer after 3min under the condition that the ship main control console does not respond, and the control system of the ship body can be requested to be handed over by the main control computer through the request quit control intervention module arranged at the top of the ship auxiliary console.
Preferably, the two ship control platforms can independently operate and control the navigation state of the ship, including speed, course and the like, the operating systems of the two ship control platforms are not interfered with each other, and only one of the two ship control platforms is allowed to operate and control the navigation of the ship under the normal working state.
In the technical scheme, the invention provides the following technical effects and advantages:
1. the cab structure of the invention forms the cab structure of the fore-and-aft bi-directional navigation ship by the fore-and-aft cab body, meets the operation requirement of fore-and-aft bi-directional navigation of the ship, is provided with two control consoles which are mutually independent, simplifies the fore-and-aft bi-directional navigation operation control process of the ship, and is provided with the communication passage which can facilitate communication and walking of a crew during alternate navigation of the ship between the fore and the aft.
2. The cab structure of the invention can prevent the ship body from being operated by the ship auxiliary control platform when the ship main control platform controls the ship body to move, thus avoiding the conflict of two operation systems. The auxiliary computer control intervention module arranged at the top of the ship main control console can transfer the actual operation system of the ship body to the auxiliary control computer, and the control right of the ship main control console and the control right of the ship auxiliary console can be switched quickly and conveniently, so that the ship body can be operated more simply.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic structural view of a main body of a cab structure of a ship which is sailed between a bow and a stern in two directions.
Fig. 2 is a schematic view of the structure of the outer wall of the cab of the fore-aft bi-directional vessel of the present invention.
FIG. 3 is a schematic view of an electric suction door structure in a cab structure of a ship for bi-directional navigation between bow and stern according to the present invention.
FIG. 4 is a schematic structural view of a main console in a cab structure of a bow-stern bi-directional navigation vessel according to the present invention;
fig. 5 is a schematic structural view of a ship auxiliary control console in a cab structure of a fore-aft bi-directional navigation ship of the present invention.
Description of reference numerals:
the system comprises a heading cab body 1, a stern cab body 2, a communication passageway 3, a ship main control console 4-1, a ship auxiliary control console 4-2, an electric suction door 5, a safety door 6, a cab outer wall 7, a double-layer observation window 8, an anti-corrosion sealing rubber strip 9, a magnetic suction door 10, an iron-nickel alloy plate 11, an electromagnetic block 12, an electromagnetic switch 13, a control instrument console 14, a main control computer 15, an auxiliary control computer 16, a computer control intervention module 17, a computer control intervention module 18, a control intervention module 19 and a control intervention module 20.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
Referring to the attached figures 1-5 of the specification, the invention relates to a cab structure of a fore-aft bi-directional navigation ship, which comprises a heading cab body 1 and a stern-oriented cab body 2, wherein the heading cab body 1 and the stern-oriented cab body 2 are arranged at the topmost layer of an upper layer building of the ship, ship control consoles 4 are respectively designed in the heading cab body 1 and the stern-oriented cab body 2, for the purpose of distinguishing, a ship main control console 4-1 is arranged inside the heading cab body 1, and a ship auxiliary control console 4-2 is arranged inside the stern-oriented cab body.
One side of the fore cab body 1 is provided with a communicating passageway 3, and one end of the communicating passageway 3 is connected with the stern cab body 2. The electric suction door 5 is arranged at the communication position of the heading cab body 1, the stern cab body 2 and the communication passageway 3, the heading cab body 1 and the bridge wing are of a one-piece structure and are of a closed structure, so that the condition that a crew cannot observe conveniently in the open air in rainy and snowy days is avoided. The safety doors 6 are arranged on the outer walls of one sides of the fore cab body 1 and the stern cab body 2. The fore cab body 1 and the stern cab body 2 comprise cab outer walls 7, mounting holes are formed in the outer walls of the cab outer walls 7 and are distributed equidistantly, double-layer observation windows 8 are fixedly arranged on the inner walls of the mounting holes, and anti-corrosion sealing rubber strips 9 are fixedly arranged on the outer walls of the two sides of the double-layer observation windows 8.
Foretell electricity is inhaled door 5 including magnetism door 10 and electromagnetism piece 12, magnetism door 10 is the one-way switching type, its top one side is fixed and is equipped with iron-nickel alloy board 11, the electricity is inhaled fixed electromagnetism piece 12 that is equipped with in bottom one side of door 5, both sides are all fixed and are equipped with electromagnetic switch 13 around the door frame of door 5 is inhaled to the electricity, electromagnetism piece 12 passes through wire and electromagnetic switch 13 electric connection, electromagnetic switch 13 is connected with the power cord, door 5 is inhaled to the electricity, the sound insulation material has all been laid with the wall in intercommunication passageway 3 to emergency exit 6, in order to satisfy the requirement of boats and ships cabin noise.
The length of the communication passageway 3 can be adjusted according to the arrangement position of the fore and aft cabs, and box-shaped beam structures are arranged on the top and the side of the communication passageway at intervals of the ribs of the ship so as to ensure the strength and the stability of the communication passageway as a ship steel structure.
The ship control consoles 4 can independently operate and control the navigation states of the ship, including the speed, the course and the like, the operating systems of the two ship control consoles 4 are not interfered with each other, and only one of the ship control consoles 4 is allowed to operate and control the navigation of the ship under the normal working state.
A control instrument table 14 is arranged on one side of the tops of the ship main control table 4-1 and the ship auxiliary control table 4-2, a main control computer 15 is arranged on one side of the top of the ship main control table 4-1, and an auxiliary computer control intervention module 17 and a main computer control intervention module 18 are respectively arranged on one side of the top of the ship main control table 4-1. An auxiliary control computer 16 is arranged on one side of the top of the ship auxiliary control platform 4-2, and a main computer control intervention module 18 and a request control intervention module 19 are respectively arranged on one side of the top of the ship auxiliary control platform 4-2. The ship main control station 4-1 and the ship auxiliary control station 4-2 mutually know the operation conditions through monitoring equipment, and radio communication systems are arranged in the ship main control station 4-1 and the ship auxiliary control station 4-2 so as to mutually know the sailing state under the normal condition of an interference-free instrument.
The actual operation system of the ship body can be handed over to the auxiliary control computer 16 through the auxiliary computer control intervention module 17 arranged at the top of the ship main control platform 4-1, the actual operation system of the ship body can be actively switched over through the main computer control intervention module 18 arranged at the top of the ship main control platform 4-1, the actual operation right of the ship body is handed over to the main control computer 15, the control system of the ship body can be requested to operate by the main control computer 15 through the request control intervention module 19 arranged at the top of the ship auxiliary control platform 4-2, the control system of the ship body is automatically switched to the main control computer 15 after 3min under the condition that the ship main control platform 4-1 does not respond, and the control system which can request the main control computer 15 to hand over the ship body can be automatically switched over through the request quit control intervention module 20 arranged at the top of the ship auxiliary control platform 4-2.
Besides convenient observation, the cab structure of the fore-and-aft bi-directional navigation ship meets the operation requirements of fore-and-aft bi-directional navigation of the ship, and simplifies the fore-and-aft bi-directional navigation operation control process of the ship by arranging two control consoles which are mutually independent. Meanwhile, the arranged communicating passageway can also facilitate communication and walking of crew members when the ship alternately navigates between the bow and the stern.
In the actual course process, the ship control consoles 4 can be independently operated in the fore cab body 1 and the aft cab body 2 to control the navigation states of the ship, including the speed, the course and the like, and the operating systems of the two ship control consoles 4 are not interfered with each other, but only one of the ship control consoles 4 is allowed to operate and control the navigation of the ship under the normal working state.
Therefore, when navigating in the fore direction, a crew only needs to operate in the fore cab body 1, and when navigating in the stern direction, the crew only needs to operate in the stern cab body 2, mutual interference of operation signals under the condition that the crew is arranged in the fore cab body 1 and the stern cab body 2 is avoided, and the actual operation system of the ship body can be handed over to the auxiliary control computer 16 through the auxiliary computer control intervention module 17 arranged at the top of the ship main control console 4-1. The actual operation system of the ship body can be actively switched by the intervention module 18 controlled by the main computer arranged at the top of the ship main control platform 4-1, the actual operation right of the ship body is handed over to the main control computer 15, the control system of the ship body can be requested to operate by the main control computer 15 by the intervention module 19 controlled by the request arranged at the top of the ship auxiliary control platform 4-2, the control system of the ship body is automatically switched to the main control computer 15 to operate the ship body after 3min under the condition that the ship main control platform 4-1 does not respond, the control system of the ship body can be requested to be handed over by the main control computer 15 by the intervention module 20 controlled by the request quit control arranged at the top of the ship auxiliary control platform 4-2, and the control right of the ship main control platform 4-1 and the ship auxiliary control platform can be rapidly and conveniently switched, so that the ship body can be operated more simply.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (7)
1. The cab structure of the ship for the bow-stern bidirectional navigation comprises a bow cab body (1) and a stern cab body (2), wherein the bow cab body (1) and the stern cab body (2) are arranged at the topmost layer of an upper layer of the ship, and is characterized in that one side of the bow cab body (1) is provided with a communicating passageway (3), one end of the communicating passageway (3) is connected with the stern cab body (2), the bow cab body (1), the stern cab body (2) and the communicating passageway (3) are provided with an electric suction door (5) at a communicating position, a ship control console ship main control console (4-1) is arranged inside the bow cab body (1), a ship auxiliary control console (4-2) is arranged inside the stern cab body (2), and controllers are arranged on one sides of the tops of the ship control console (4-1) and the auxiliary console (4-2) Table (14), top one side of boats and ships master control platform (4-1) is equipped with main control computer (15), the top opposite side of boats and ships master control platform (4-1) is equipped with vice computer control respectively and intervenes module (17) and main computer control and intervenes module (18), top one side of boats and ships auxiliary control platform (4-2) is equipped with vice control computer (16), the top opposite side of boats and ships auxiliary control platform (4-2) is equipped with main computer control respectively and intervenes module (18) and request control and intervenes module (19).
2. The cab structure of a fore-aft bi-directional sailing vessel according to claim 1, characterized in that: the heading cab body (1) and the bridge wing are of a one-piece structure, and a safety door (6) is arranged on the outer wall of one side of the heading cab body (1) and the outer wall of one side of the stern cab body (2).
3. The cab structure of a fore-aft bi-directional sailing vessel according to claim 1, characterized in that: the fore cab body (1) and the stern cab body (2) comprise cab outer walls (7), mounting holes distributed at equal intervals are formed in the outer walls of the cab outer walls (7), double-layer observation windows (8) are fixedly arranged on the inner walls of the mounting holes, and anti-corrosion sealing rubber strips (9) are fixedly arranged on the outer walls of the two sides of the double-layer observation windows (8).
4. The cab structure of a fore-aft bi-directional sailing vessel according to claim 1, characterized in that: the electric suction door (5) comprises a magnetic suction door (10) and an electromagnetic block (12), the magnetic suction door (10) is of a one-way opening and closing type, an iron-nickel alloy plate (11) is fixedly arranged on one side of the top of the magnetic suction door, the electromagnetic block (12) is fixedly arranged on one side of the bottom of the electric suction door (5), electromagnetic switches (13) are fixedly arranged on the front side and the rear side of a door frame of the electric suction door (5), the electromagnetic block (12) is electrically connected with the electromagnetic switches (13) through wires, and the electromagnetic switches (13) are connected with power lines.
5. The cab structure of a fore-aft bi-directional sailing vessel according to claim 1, characterized in that: and sound insulation materials are coated on the walls of the electric suction door (5), the safety door (6) and the communication passageway (3).
6. The cab structure of a fore-aft bi-directional sailing vessel according to claim 1, characterized in that: the ship main control console (4-1) and the ship auxiliary control console (4-2) mutually know the operation conditions through monitoring equipment, and radio communication systems are arranged in the ship main control console (4-1) and the ship auxiliary control console (4-2).
7. The cab structure of a fore-aft bi-directional sailing vessel according to claim 6, characterized in that: a secondary computer control intervention module (17) arranged at the top of the ship main control console (4-1) to transfer the actual operating system of the ship body to the secondary control computer (16), a main computer arranged on the top of the ship main control platform (4-1) controls an intervention module (18) to actively switch the actual operating system of the ship body to be handed over to the main control computer (15), a control system which is arranged on the top of the ship secondary control platform (4-2) and requests to control an intervention module (19) so as to request a main control computer (15) to operate a ship body, automatically switching to a control system of a main control computer (15) for operating the ship body after 3min under the condition that the ship main control console (4-1) does not respond, and a control system which is arranged at the top of the ship auxiliary control platform (4-2) and requests the main control computer (15) to transfer the ship body by a request exit control intervention module (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111431640.4A CN113928474A (en) | 2021-11-29 | 2021-11-29 | Cab structure of bow-stern bidirectional navigation ship |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111431640.4A CN113928474A (en) | 2021-11-29 | 2021-11-29 | Cab structure of bow-stern bidirectional navigation ship |
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| Publication Number | Publication Date |
|---|---|
| CN113928474A true CN113928474A (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111431640.4A Pending CN113928474A (en) | 2021-11-29 | 2021-11-29 | Cab structure of bow-stern bidirectional navigation ship |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100000773U (en) * | 2008-07-15 | 2010-01-25 | 대우조선해양 주식회사 | A Bridge Wing Console for a Ship capable of Direction Regulation |
| TWM459274U (en) * | 2012-12-27 | 2013-08-11 | Zhang zhi qi | Energy-saving magnetic lock |
| KR20160080754A (en) * | 2014-12-30 | 2016-07-08 | 대우조선해양 주식회사 | Double wheelhouse multi air condtioning system and artic vessel having the double wheelhouse multi air condtioning system |
| WO2017071596A1 (en) * | 2015-10-28 | 2017-05-04 | 中国国际海运集装箱(集团)股份有限公司 | Hydraulic system of two-way driving shuttle vehicle |
| CN110053709A (en) * | 2019-04-30 | 2019-07-26 | 广船国际有限公司 | Two-way one people's bridge cab structure of navigating ship |
| CN211844305U (en) * | 2019-12-03 | 2020-11-03 | 江越（武汉）控制技术有限公司 | Double-cab control circuit interlocking device |
| CN112124087A (en) * | 2019-06-24 | 2020-12-25 | 中车时代电动汽车股份有限公司 | Distributed control device and method for bidirectional running vehicle |
-
2021
- 2021-11-29 CN CN202111431640.4A patent/CN113928474A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100000773U (en) * | 2008-07-15 | 2010-01-25 | 대우조선해양 주식회사 | A Bridge Wing Console for a Ship capable of Direction Regulation |
| TWM459274U (en) * | 2012-12-27 | 2013-08-11 | Zhang zhi qi | Energy-saving magnetic lock |
| KR20160080754A (en) * | 2014-12-30 | 2016-07-08 | 대우조선해양 주식회사 | Double wheelhouse multi air condtioning system and artic vessel having the double wheelhouse multi air condtioning system |
| WO2017071596A1 (en) * | 2015-10-28 | 2017-05-04 | 中国国际海运集装箱(集团)股份有限公司 | Hydraulic system of two-way driving shuttle vehicle |
| CN110053709A (en) * | 2019-04-30 | 2019-07-26 | 广船国际有限公司 | Two-way one people's bridge cab structure of navigating ship |
| CN112124087A (en) * | 2019-06-24 | 2020-12-25 | 中车时代电动汽车股份有限公司 | Distributed control device and method for bidirectional running vehicle |
| CN211844305U (en) * | 2019-12-03 | 2020-11-03 | 江越（武汉）控制技术有限公司 | Double-cab control circuit interlocking device |
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