CN110526133B - High-low speed automatic switching system and switching method for rescue boat recycling process - Google Patents
High-low speed automatic switching system and switching method for rescue boat recycling process Download PDFInfo
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- CN110526133B CN110526133B CN201910779749.3A CN201910779749A CN110526133B CN 110526133 B CN110526133 B CN 110526133B CN 201910779749 A CN201910779749 A CN 201910779749A CN 110526133 B CN110526133 B CN 110526133B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004064 recycling Methods 0.000 title description 3
- 238000011084 recovery Methods 0.000 claims abstract description 30
- 239000000725 suspension Substances 0.000 claims abstract description 10
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- B63B23/00—Equipment for handling lifeboats or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C9/00—Life-saving in water
- B63C9/02—Lifeboats, life-rafts or the like, specially adapted for life-saving
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/06—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control And Safety Of Cranes (AREA)
- Motor And Converter Starters (AREA)
Abstract
The invention relates to a high-low speed automatic switching system and a switching method for a rescue boat recovery process, wherein the system comprises a rotary suspension arm (1) and a fixed arm support (2), the fixed arm support (2) comprises an outer upright post (2-1) and an inner upright post (2-2), a rotary shaft (3) is arranged on the inner upright post (2-2) in an extending mode, and one end of the rotary suspension arm (1) rotates around the rotary shaft (3) so as to realize the lowering and recovery of the rescue boat; the method is characterized in that: a first limiting device (4) and a limiting collision block (5) are arranged on the inner side of the outer upright post (2-1), and a second limiting device (6) is arranged on the inner side of the inner upright post (2-2); when the rescue boat is electrically recovered, the rescue boat is lifted at a high speed, and then recovered at a low speed to a preset position, so that the whole process is ensured to be stable and stable, the phenomenon that the boat body is severely swayed due to too high recovery speed is avoided, and meanwhile, the rescue boat and the fixed arm frame are prevented from being severely collided when the rescue boat is recovered and released.
Description
Technical Field
The invention relates to the technical field of rescue boat recovery, in particular to a high-low speed automatic switching system and a switching method thereof for a rescue boat recovery process.
Background
According to the requirements of International maritime life safety convention and China's maritime life equipment Specification, the following conditions must be satisfied for the rescue boat to be lowered: the rescue boat is lowered to the sea within a period of not more than 5 minutes under the condition that the mother ship loses power; and the recovery of the rescue boat is required to meet the following conditions: i.e. not less than 18 m/min, lifting the rescue boat from the sea. Therefore, the rescue boat is generally lowered by self gravity, and the recovery is lifted by a driving device such as a motor. In the lifting process of the motor-driven rescue boat, the problem that the rescue boat is not installed in place due to the fact that the motor-driven rescue boat is too high in rotating speed is solved, the boat body is easy to shake due to the fact that the recovery speed of the rescue boat is too high, and meanwhile the rescue boat is easy to collide with the arm frame severely to cause damage when the rescue boat is rotated in place and recovered in place.
Disclosure of Invention
Aiming at the defects and shortcomings existing in the prior art, the invention provides a high-low speed automatic switching system and a switching method thereof for a rescue boat recycling process.
The technical scheme adopted for solving the technical problems is as follows:
the high-low speed automatic switching system for the recovery process of the rescue boat comprises a rotary suspension arm and a fixed arm support, wherein the fixed arm support comprises an outer upright post and an inner upright post, a rotary shaft is arranged on the inner upright post in an extending mode, and one end of the rotary suspension arm rotates around the rotary shaft so as to realize the lowering and recovery of the rescue boat; the method is characterized in that: a first limiting device and a limiting collision block are arranged on the inner side of the outer upright post, and a second limiting device is arranged on the inner side of the inner upright post;
a motor control circuit of the high-low speed automatic switching system is provided with a high-speed lifting loop, a low-speed lifting loop and a stable positioning loop; and the high-speed lifting loop, the low-speed lifting loop and the stable positioning loop are mutually connected in parallel; the output end of the motor control circuit is connected with a driving motor;
the high-speed lifting loop comprises a high-speed lifting switch, a third limit switch, a first intermediate relay and a second intermediate relay which are connected with each other, wherein the first intermediate relay and the second intermediate relay are connected in parallel, and any one of the high-speed lifting switch, the third limit switch and the first intermediate relay and the second intermediate relay is connected in series with each other;
the low-speed lifting loop comprises a first intermediate relay first contact, a second intermediate relay second contact, a second alternating current contactor first contact, a first thermal relay and a first alternating current contactor which are connected in series;
the stable positioning loop comprises a second intermediate relay first contact, a first intermediate relay second contact, a first alternating current contactor first contact, a second thermal relay and a second alternating current contactor which are connected in series;
the device also comprises a first limit switch and a second limit switch which are connected in series with the high-speed lifting loop, the low-speed lifting loop and the stable positioning loop, wherein the first limit switch and the second limit switch are connected in series;
and wherein the first and second heat exchangers are configured to,
when the first limiting device is pressed down, the third limiting switch is closed, a normally open contact of the third limiting switch is closed, and a normally closed contact of the third limiting switch is opened; when the first limiting device is released and reset, the third limiting switch is opened, a normally open contact of the third limiting switch is opened, and a normally closed contact of the third limiting switch is closed;
when the second limiting device is pressed down, the first limiting switch and the second limiting switch are simultaneously disconnected; when the second limiting device is released and reset, the first limiting switch and the second limiting switch are simultaneously closed;
when the first intermediate relay is closed and electrified, a first contact of the first intermediate relay is closed, and a second contact of the first intermediate relay is opened; when the first intermediate relay is disconnected and loses power, a first contact of the first intermediate relay is disconnected, and a second contact of the first intermediate relay is closed;
when the second intermediate relay is closed and electrified, the first contact of the second intermediate relay is closed, and the second contact of the second intermediate relay is opened; when the second intermediate relay is disconnected and loses power, the first contact of the second intermediate relay is disconnected, and the second contact of the second intermediate relay is closed;
when the first alternating current contactor is electrified, the first contact of the first alternating current contactor is opened, the second contact of the first alternating current contactor is closed, and the third contact of the first alternating current contactor is closed; when the first alternating current contactor is powered off, the first contact of the first alternating current contactor is closed, the second contact of the first alternating current contactor is opened, and the third contact of the first alternating current contactor is opened;
when the second alternating current contactor is electrified, the first contact of the second alternating current contactor is opened, the second contact of the second alternating current contactor is closed, and the third contact of the second alternating current contactor is closed; when the second alternating current contactor is powered off, the first contact of the second alternating current contactor is closed, the second contact of the second alternating current contactor is opened, and the third contact of the second alternating current contactor is opened.
Further, the first contact of the first alternating current contactor is also connected with a low-speed lifting switch in parallel.
Further, the invention also provides a switching method of the high-low speed automatic switching system for the recovery process of the rescue boat, which is characterized in that: the method comprises the following steps:
1) In the initial recovery state, the rotary suspension arm is in a suspension state, and the limiting collision block keeps pressing down the first limiting device, so that the third limiting switch is closed, the normally open contact of the third limiting switch is closed, and the normally closed contact is opened;
2) When the high-speed lifting switch is pressed down, the second intermediate relay is closed and electrified, the first contact of the second intermediate relay is closed, the second contact of the second intermediate relay is opened, the second alternating-current contactor is electrified, the second contact of the second alternating-current contactor is closed, the third contact of the second alternating-current contactor is closed, the driving motor operates at a high speed, and the rescue boat is recovered from the sea at a high speed;
3) When the rescue boat is lifted to a turning position, the rotary boom leaves the fixed boom, a limit collision block arranged on the fixed boom leaves synchronously and loosens the pressing of the first limiting device, at the moment, the third limiting switch is opened, a normally open contact of the third limiting switch is opened, and a normally closed contact of the third limiting switch is closed, so that the second alternating-current contactor is opened at the moment, the second alternating-current contactor is powered off, the driving motor stops high-speed operation, meanwhile, the first intermediate relay is closed and electrified, the first alternating-current contactor is electrified, the second contact of the first alternating-current contactor is closed, the third contact of the first alternating-current contactor is closed, the first contact of the first alternating-current contactor is closed, and the driving motor runs at a low speed;
4) When the rotary boom is slowly recovered to the fixed arm support, the rotary boom collides with the second limiting device to enable the second limiting device to be pressed down, the first limiting switch and the second limiting switch are simultaneously disconnected, a circuit is cut off, and the driving motor stops running.
The beneficial effects of the invention are as follows:
(1) When the rescue boat is electrically recovered, the rescue boat is lifted at a high speed, and then recovered at a low speed to a preset position, so that the whole process is ensured to be stable and stable, the phenomenon that the boat body is severely swayed due to too high recovery speed is avoided, and meanwhile, the rescue boat and the fixed arm frame are prevented from being severely collided when the rescue boat is recovered and released.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of a high and low speed automatic switching system for a rescue boat recovery process, as claimed in the present invention;
fig. 2 is a schematic view of the rescue boat of the present invention in an initial position.
Fig. 3 is a schematic view of the rescue boat of the present invention in a configuration for recovery from an initial position to a recovery position.
Fig. 4 is a schematic view of the rescue boat of the present invention in a recovery position.
Fig. 5 is a circuit block diagram of a high-low speed automatic switching system for a rescue boat recovery process as claimed in the present invention.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
As shown in fig. 1-5, a high-low speed automatic switching system for a rescue boat recovery process comprises a rotary boom 1 and a fixed boom 2, wherein the fixed boom 2 comprises an outer upright post 2-1 and an inner upright post 2-2, a rotary shaft 3 is arranged on the inner upright post 2-2 in an extending manner, and one end of the rotary boom 1 rotates around the rotary shaft 3 so as to realize the lowering and recovery of the rescue boat; the inner side of the outer upright post 2-1 is provided with a first limiting device 4 and a limiting collision block 5, the limiting collision block 5 is used for pressing the first limiting device 4, the first limiting device 4 is used for realizing high-speed recovery of the rescue boat when being pressed, the first limiting device 4 is used for realizing low-speed recovery of the rescue boat when being released for resetting, the inner side of the inner upright post 2-2 is provided with a second limiting device 6, and the second limiting device 6 is used for realizing disconnection of the whole motor control circuit when being pressed;
a motor control circuit of the high-low speed automatic switching system is provided with a high-speed lifting loop, a low-speed lifting loop and a stable positioning loop; and the high-speed lifting loop, the low-speed lifting loop and the stable positioning loop are mutually connected in parallel; the output end of the motor control circuit is connected with a driving motor M;
the high-speed lifting loop comprises a high-speed lifting switch SB-1, a third limit switch 3SQ, a first intermediate relay 1KA and a second intermediate relay 2KA which are connected with each other, wherein the first intermediate relay 1KA and the second intermediate relay 2KA are connected in parallel, and any one of the high-speed lifting switch SB-1, the third limit switch 3SQ and the first intermediate relay 1KA and the second intermediate relay 2KA is connected in series with each other;
the low-speed lifting loop comprises a first intermediate relay first contact 1KA-1, a second intermediate relay second contact 2KA-2, a second alternating current contactor first contact 2KM-1, a first thermal relay 1FR and a first alternating current contactor 1KM which are connected in series;
in the stable positioning loop, the stable positioning loop comprises a second intermediate relay first contact 2KA-1, a first intermediate relay second contact 1KA-2, a first alternating current contactor first contact 1KM-1, a second thermal relay 2FR and a second alternating current contactor 2KM which are connected in series;
the device also comprises a first limit switch 1SQ and a second limit switch 2SQ which are connected in series with the high-speed lifting loop, the low-speed lifting loop and the stable positioning loop, wherein the first limit switch 1SQ and the second limit switch 2SQ are connected in series;
and wherein the first and second heat exchangers are configured to,
when the first limiting device 4 is pressed down, the third limiting switch 3SQ is closed, the normally open contact 3SQ-1 of the third limiting switch 3SQ is closed, and the normally closed contact 3SQ-2 is opened; when the first limiting device 4 is released and reset, the third limiting switch 3SQ is opened, the normally open contact of the third limiting switch 3SQ is opened, and the normally closed contact is closed;
when the second limiting device 6 is pressed, the first limiting switch 1SQ and the second limiting switch 2SQ are simultaneously disconnected; when the second limiting device 6 is released and reset, the first limiting switch 1SQ and the second limiting switch 2SQ are closed at the same time;
when the first intermediate relay 1KA is closed and electrified, the first intermediate relay first contact 1KA-1 is closed, and the first intermediate relay second contact 1KA-2 is opened; when the first intermediate relay 1KA is disconnected and loses power, the first intermediate relay first contact 1KA-1 is disconnected, and the first intermediate relay second contact 1KA-2 is closed;
when the second intermediate relay 2KA is closed and electrified, the first contact 2KA-1 of the second intermediate relay is closed, and the second contact 2KA-2 of the second intermediate relay is opened; when the second intermediate relay 2KA is disconnected and loses power, the first contact 2KA-1 of the second intermediate relay is disconnected, and the second contact 2KA-2 of the second intermediate relay is closed;
when the first alternating current contactor 1KM is electrified, the first contact 1KM-1 of the first alternating current contactor is opened, the second contact 1KM-2 of the first alternating current contactor is closed, and the third contact 1KM-3 of the first alternating current contactor is closed; when the first alternating current contactor 1KM loses power, the first contact 1KM-1 of the first alternating current contactor is closed, the second contact 1KM-2 of the first alternating current contactor is opened, and the third contact 1KM-3 of the first alternating current contactor is opened;
when the second alternating current contactor 2KM is electrified, the first contact 2KM-1 of the second alternating current contactor is opened, the second contact 2KM-2 of the second alternating current contactor is closed, and the third contact 2KM-3 of the second alternating current contactor is closed; when the second alternating current contactor 2KM loses power, the first contact 2KM-1 of the second alternating current contactor is closed, the second contact 2KM-2 of the second alternating current contactor is opened, and the third contact 2KM-3 of the second alternating current contactor is opened.
Specifically, the first contact 1KM-1 of the first alternating current contactor is also connected with a low-speed lifting switch SB-2 in parallel, so that the on-off of a low-speed lifting loop can be controlled manually.
Specifically, the invention also provides a switching method of the high-low speed automatic switching system for the recovery process of the rescue boat, which comprises the following steps:
1) In the initial recovery state, the rotary boom 1 is in a hoisting state, and the limiting collision block 5 keeps pressing the first limiting device 4, so that the third limiting switch 3SQ is closed, the normally open contact 3SQ-1 of the third limiting switch 3SQ is closed, and the normally closed contact 3SQ-2 is opened; at the moment, the first alternating current contactor 1KM and the second alternating current contactor 2KM are not electrified, so that the first alternating current contactor third contact 1KM-3 and the second alternating current contactor third contact 2KM-3 are disconnected, and the driving motor M does not work;
2) When the high-speed lifting switch SB-1 is pressed, the second intermediate relay 2KA is closed and electrified, the first contact 2KA-1 of the second intermediate relay is closed, the second contact 2KA-2 of the second intermediate relay is opened, the second alternating current contactor 2KM is electrified, the second contact 2KM-2 of the second alternating current contactor is closed, the third contact 2KM-3 of the second alternating current contactor is closed, the driving motor M operates at a high speed, and the rescue boat is recovered from the sea at a high speed;
3) When the rescue boat is lifted to a turning position, the rotary boom 1 leaves the fixed boom 2, the limit bump 5 arranged on the fixed boom 2 leaves synchronously and releases the pressing of the first limit device 4, at the moment, the third limit switch 3SQ is opened, the normally open contact 3SQ-1 of the third limit switch 3SQ is opened, and the normally closed contact 3SQ-2 is closed, so that at the moment, the 2KA-1 is opened, the second alternating current contactor 2KM is powered off, the driving motor M stops high-speed operation, meanwhile, the first intermediate relay 1KA is powered on, the first alternating current contactor 1KM is powered on, the first alternating current contactor second contact 1KM-2 is closed, the first alternating current contactor third contact 1KM-3 is closed, the first alternating current contactor first contact 1KM-1 is closed, and the driving motor M runs at a low speed;
4) When the rotary boom 1 is slowly recovered to the fixed boom 2, the rotary boom 1 collides with the second limiting device 6 to enable the second limiting device 6 to be pressed down, the first limiting switch 1SQ and the second limiting switch 2SQ are simultaneously disconnected, a circuit is cut off, and the driving motor M stops running.
Therefore, when the rescue boat is electrically recovered, the rescue boat is lifted at a high speed, then recovered to a preset position at a low speed, the whole process is ensured to be stable, the phenomenon that the boat body is severely swayed due to too high recovery speed is avoided, and meanwhile, the rescue boat and the fixed arm frame are prevented from violent collision when the rescue boat is recovered and released
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (3)
1. The high-low speed automatic switching system for the recovery process of the rescue boat comprises a rotary suspension arm (1) and a fixed arm support (2), wherein the fixed arm support (2) comprises an outer upright post (2-1) and an inner upright post (2-2), a rotary shaft (3) is arranged on the inner upright post (2-2) in an extending mode, and one end of the rotary suspension arm (1) rotates around the rotary shaft (3) so as to realize the lowering and recovery of the rescue boat; the method is characterized in that: a first limiting device (4) and a limiting collision block (5) are arranged on the inner side of the outer upright post (2-1), and a second limiting device (6) is arranged on the inner side of the inner upright post (2-2);
a motor control circuit of the high-low speed automatic switching system is provided with a high-speed lifting loop, a low-speed lifting loop and a stable positioning loop; and the high-speed lifting loop, the low-speed lifting loop and the stable positioning loop are mutually connected in parallel; the output end of the motor control circuit is connected with a driving motor (M);
the high-speed lifting loop comprises a high-speed lifting switch (SB-1), a third limit switch (3 SQ), a first intermediate relay (1 KA) and a second intermediate relay (2 KA) which are connected with each other, wherein the first intermediate relay (1 KA) and the second intermediate relay (2 KA) are connected in parallel, and any one of the high-speed lifting switch (SB-1), the third limit switch (3 SQ) and the first intermediate relay (1 KA) and the second intermediate relay (2 KA) is connected in series with each other;
the low-speed lifting loop comprises a first intermediate relay first contact (1 KA-1), a second intermediate relay second contact (2 KA-2), a second alternating current contactor first contact (2 KM-1), a first thermal relay (1 FR) and a first alternating current contactor (1 KM) which are connected in series;
the stable positioning loop comprises a second intermediate relay first contact (2 KA-1), a first intermediate relay second contact (1 KA-2), a first alternating current contactor first contact (1 KM-1), a second thermal relay (2 FR) and a second alternating current contactor (2 KM) which are connected in series;
the device also comprises a first limit switch (1 SQ) and a second limit switch (2 SQ) which are connected in series with the high-speed lifting loop, the low-speed lifting loop and the stable positioning loop, and the first limit switch (1 SQ) and the second limit switch (2 SQ) are connected in series;
and wherein the first and second heat exchangers are configured to,
when the first limiting device (4) is pressed down, the third limiting switch (3 SQ) is closed, a normally open contact (3 SQ-1) of the third limiting switch (3 SQ) is closed, and a normally closed contact (3 SQ-2) is opened; when the first limiting device (4) is released and reset, the third limiting switch (3 SQ) is opened, a normally open contact of the third limiting switch (3 SQ) is opened, and a normally closed contact is closed;
when the second limiting device (6) is pressed down, the first limiting switch (1 SQ) and the second limiting switch (2 SQ) are simultaneously disconnected; when the second limiting device (6) is released and reset, the first limiting switch (1 SQ) and the second limiting switch (2 SQ) are simultaneously closed;
when the first intermediate relay (1 KA) is closed and electrified, the first contact (1 KA-1) of the first intermediate relay is closed, and the second contact (1 KA-2) of the first intermediate relay is opened; when the first intermediate relay (1 KA) is disconnected and loses power, the first contact (1 KA-1) of the first intermediate relay is disconnected, and the second contact (1 KA-2) of the first intermediate relay is closed;
when the second intermediate relay (2 KA) is closed and electrified, the first contact (2 KA-1) of the second intermediate relay is closed, and the second contact (2 KA-2) of the second intermediate relay is opened; when the second intermediate relay (2 KA) is disconnected and loses power, the first contact (2 KA-1) of the second intermediate relay is disconnected, and the second contact (2 KA-2) of the second intermediate relay is closed;
when the first alternating current contactor (1 KM) is electrified, the first contact (1 KM-1) of the first alternating current contactor is opened, the second contact (1 KM-2) of the first alternating current contactor is closed, and the third contact (1 KM-3) of the first alternating current contactor is closed; when the first alternating current contactor (1 KM) loses power, the first contact (1 KM-1) of the first alternating current contactor is closed, the second contact (1 KM-2) of the first alternating current contactor is opened, and the third contact (1 KM-3) of the first alternating current contactor is opened;
when the second alternating current contactor (2 KM) is electrified, the first contact (2 KM-1) of the second alternating current contactor is opened, the second contact (2 KM-2) of the second alternating current contactor is closed, and the third contact (2 KM-3) of the second alternating current contactor is closed; when the second alternating current contactor (2 KM) loses power, the first contact (2 KM-1) of the second alternating current contactor is closed, the second contact (2 KM-2) of the second alternating current contactor is opened, and the third contact (2 KM-3) of the second alternating current contactor is opened.
2. A high-low speed automatic switching system for a rescue boat recovery process according to claim 1, wherein: the first contact (1 KM-1) of the first alternating current contactor is also connected with a low-speed lifting switch (SB-2) in parallel.
3. A switching method of a high-low speed automatic switching system for a rescue boat recovery process according to any one of claims 1 to 2, wherein: the method comprises the following steps:
1) In the initial recovery state, the rotary suspension arm (1) is in a suspension state, and the limiting collision block (5) keeps pressing the first limiting device (4), so that the third limiting switch (3 SQ) is closed, the normally open contact (3 SQ-1) of the third limiting switch (3 SQ) is closed, and the normally closed contact (3 SQ-2) is opened;
2) When the high-speed lifting switch (SB-1) is pressed down, the second intermediate relay (2 KA) is closed and electrified, the first contact (2 KA-1) of the second intermediate relay is closed, the second contact (2 KA-2) of the second intermediate relay is opened, the second alternating current contactor (2 KM) is electrified, the second contact (2 KM-2) of the second alternating current contactor is closed, the third contact (2 KM-3) of the second alternating current contactor is closed, and the driving motor (M) operates at a high speed to recover the rescue boat from the sea;
3) When the rescue boat is lifted to a turning position, the rotary boom (1) leaves the fixed boom (2), a limit bump (5) arranged on the fixed boom (2) leaves synchronously and releases the pressing of a first limit device (4), at the moment, a third limit switch (3 SQ) is opened, a normally open contact (3 SQ-1) of the third limit switch (3 SQ) is opened, a normally closed contact (3 SQ-2) is closed, so that at the moment (2 KA-1) is opened, a second alternating current contactor (2 KM) is powered off, a driving motor (M) stops high-speed operation, a first intermediate relay (1 KA) is powered on, a first alternating current contactor (1 KM) is powered on, a first alternating current contactor second contact (1 KM-2) is closed, a first alternating current contactor third contact (1 KM-3) is closed, a first alternating current contactor first contact (1 KM-1) is closed, and the driving motor (M) runs at a low speed;
4) When the rotary boom (1) is slowly recovered to the fixed boom (2), the rotary boom (1) bumps into the second limiting device (6) again, so that the second limiting device (6) is pressed down, the first limiting switch (1 SQ) and the second limiting switch (2 SQ) are simultaneously disconnected, a circuit is cut off, and the driving motor (M) stops running.
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