Load rejection device and passive floating equipment

Abstract

The invention provides a load rejection device and passive floating equipment, and belongs to the technical field of underwater equipment. The load rejection device comprises a platform body, an extending frame, a first lever, a metal pull rod, a positive electrode power connection end and a negative electrode power connection end. The extension frame is arranged on the lower side of the platform body; the first lever is installed on the platform body and comprises a first bearing end and a pull rod connecting end. The first end of the metal pull rod is connected with the pull rod connecting end; the anode power connection end is directly and conductively connected with the metal pull rod, and the cathode power connection end is insulated and isolated from the metal pull rod. When load rejection counterweight is needed, the positive electrode power connection end is connected with a power supply positive electrode, the negative electrode power connection end is connected with a power supply negative electrode, and the metal pull rod serves as a sacrificial anode in a water environment to be electrochemically corroded and gradually dissolved and thinned. When the metal pull rod is corroded and cannot bear the pulling force of the first lever, the metal pull rod is broken. The first bearing end of the first lever rotates relative to the platform body under the gravity action of the balance weight, and load rejection and release of the balance weight are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underwater equipment, and in particular to a weight-throwing device and a passive buoyancy device. BACKGROUND

[0002] After completing underwater operation, the underwater equipment needs to float to the water surface for salvage and recovery. For safety, the underwater equipment is configured with not only an active buoyancy device but also an emergency passive buoyancy device. The passive buoyancy device works in an emergency to realize passive buoyancy of the underwater equipment.

[0003] The passive buoyancy device includes a counterweight and a weight-throwing device for throwing the counterweight. In an emergency, the underwater equipment controls the weight-throwing device to throw the counterweight, so as to reduce its own gravity and realize passive buoyancy (that is, rely on redundant buoyancy to float). Whether the weight-throwing device can successfully throw the counterweight in an emergency is very important to ensure the recoverability and safety of the underwater equipment. The weight-throwing device installed on the existing underwater equipment is a complex mechanical device with multiple stages of transmission. In an emergency, the complex mechanical device may fail to correctly act to throw the counterweight. SUMMARY

[0004] The present application provides a weight-throwing device and a passive buoyancy device.

[0005] In a first aspect, the present application provides a weight-throwing device, comprising: a platform body, an extension frame, a first lever, a metal pull rod, a positive electrode connection end and a negative electrode connection end; the extension frame is arranged on the lower side of the platform body;

[0006] The first lever is installed on the platform body and comprises a first supporting end for limiting and fixing the counterweight and a pull rod connecting end;

[0007] The first end of the metal pull rod is connected with the pull rod connecting end, and the second end is connected with the extension frame;

[0008] The positive electrode connection end is directly conductively connected with the metal pull rod, and the negative electrode connection end is insulated from the metal pull rod.

[0009] When the counterweight needs to be thrown, the positive electrode connection end is connected with the positive electrode of the power supply, the negative electrode connection end is connected with the negative electrode of the power supply, and the metal pull rod is electrochemically corroded and gradually dissolved and thinned as a sacrificial anode in a high-conductivity water environment such as seawater. When the metal pull rod is corroded to the extent that it cannot bear the tension of the first lever, the metal pull rod breaks, and then the first supporting end of the first lever rotates relative to the platform body under the action of the gravity of the counterweight, so as to realize release of the thrown counterweight arranged at the first supporting end.

[0010] In some possible implementations, the extension frame and the first lever are metal pieces; the first end and the second end are provided with insulating isolation pieces; the first end is insulated and isolated from the first lever through the insulating isolation piece; and the second end is insulated and isolated from the extension frame through the insulating isolation piece.

[0011] The extension frame and the first lever are isolated from the metal pull rod through the insulating isolation pieces, so that the extension frame and the first lever are prevented from being electrochemically corroded as the sacrificial anode.

[0012] In some possible implementations, the negative electrode connecting end is arranged on the extension frame or the first lever.

[0013] The negative electrode connecting end is arranged on the extension frame or the first lever, so that the extension frame or the first lever is prevented from being corroded by providing electrons through the negative electrode of the power supply.

[0014] In some possible implementations, the first supporting end of the first lever is a wedge-shaped end with an upward-facing wedge surface; the platform body includes a limiting portion arranged opposite to the first supporting end; and the first supporting end is in abutting fit with a wedge-shaped fit portion on the weight mounting disc, so that the limiting fit portion of the mounting disc abuts against the limiting portion to achieve limiting fixation of the mounting disc.

[0015] The first supporting end is arranged as a wedge-shaped end, so that the wedge surface of the wedge-shaped end is fitted with the wedge surface of the weight mounting disc, and the limiting portion of the mounting disc abuts against the limiting fit portion, to achieve correct positioning of the mounting disc.

[0016] In some possible implementations, the limiting portion is a wedge-shaped portion with an upward-facing wedge surface; and the limiting portion is in limiting fit with a limiting fit portion with a downward-facing wedge surface on the mounting disc.

[0017] In some possible implementations, the electromagnetic switch is further arranged on the weight throwing platform; the working end of the electromagnetic switch is provided with a latch; the weight throwing platform further includes a second lever; the second lever is installed on the platform body and rotates relative to the platform body about a second rotation axis; the second lever includes a latch connecting end and a second supporting end; the latch connecting end is provided with a latch hole; and the second supporting end is used for limiting and fixing the weight. In the case that the latch is inserted into the latch hole, the second lever is fixed relative to the platform body. In this way, in the case that the electromagnetic switch is actuated to make the latch disengage from the latch hole, the second supporting end is subjected to the gravity of the weight to make the second lever rotate about the first rotation axis, and the weight throwing release can also be achieved.

[0018] In some possible implementations, the first rotation axis is parallel to the second rotation axis; the first supporting end and the second supporting end are both wedge-shaped ends, and the wedge-shaped surfaces of the first supporting end and the second supporting end both face upward; in the case that the metal pull rod is not broken and the bolt is inserted into the bolt hole, the first supporting end and the second supporting end are oppositely arranged to form a containing space for containing the weight mounting disc. The first supporting end and the second supporting end are arranged as oppositely arranged wedge-shaped ends, so that the cross section of the containing space is trapezoidal. In the case that the metal pull rod is broken by corrosion as a sacrificial anode or the bolt is controlled by the electromagnetic switch to leave the bolt hole, the weight mounting disc can be separated from the containing space by sliding of the wedge-shaped surfaces, and the successful unloading of the weight is realized.

[0019] In some possible implementations, the unloading platform further includes a limiting cover plate arranged at the upper portion of the containing space, and configured to limit the weight mounting disc from moving out of the containing space.

[0020] In some possible implementations, the electromagnetic switch is a normally-off switch that causes the bolt to leave the bolt hole when powered. In this way, the electromagnetic switch only needs to be powered when it is working, without the need for continuous power supply as required by the adsorption type electromagnetic switch in the related art.

[0021] In a second aspect, the embodiments of the present application provide a passive floating device, including the unloading device as above and a weight arranged at the first supporting end. The beneficial effects of the passive floating device can be referred to the related description in the first aspect above, and are not described herein again for brevity. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a first axis side schematic view of an unloading device provided by the embodiments of the present disclosure;

[0023] Figure 2 FIG. 2 is a second axis side schematic view of part of an unloading device provided by the embodiments of the present disclosure;

[0024] Figure 3 FIG. 3 is a third axis side schematic view of part of an unloading device provided by the embodiments of the present disclosure;

[0025] In the drawings: 100-weight, 110-weight body, 120-mounting rod, 130-mounting disc, 200-unloading device, 210-platform body, 220-protruding frame, 230-first lever, 231-first supporting end, 232-pull rod connecting end, 240-metal pull rod, 241-corrosion breaking part, 250-positive electrode connecting end, 260-negative electrode connecting end, 270-electromagnetic switch, 280-second lever, 281-second supporting end, 282-bolt connecting end, 283-bolt hole, 290-limiting cover plate. DETAILED DESCRIPTION

[0026] The term "and / or", mentioned in the present document, is a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. The symbol " / " in the present document represents an or relationship of the associated objects, for example, A / B represents A or B.

[0027] The terms "first" and "second" and the like in the description and claims of the present document are used to distinguish different objects, and are not used to describe a specific order of the objects. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, and this is only a distinguishing way adopted in the description of the objects with the same properties in the embodiments of the present application. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device containing a series of units does not have to be limited to those units, but can include other units not clearly listed or inherent to these processes, methods, systems, products or devices.

[0028] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to mean an example, illustration, or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. On the contrary, the use of "exemplary" or "for example" and the like is intended to present the relevant concept in a specific manner.

[0029] In the description of the embodiments of the present application, unless otherwise specified, "a plurality of" means two or more, for example, a plurality of processing units means two or more processing units, and the like; a plurality of elements means two or more elements, and the like.

[0030] Figure 1 is a first shaft side schematic view of a throw load device provided by an embodiment of the present disclosure, Figure 2 is a second shaft side schematic view of a partial assembly of a throw load device provided by an embodiment of the present disclosure, Figure 3 is a third shaft side schematic view of a partial assembly of a throw load device provided by an embodiment of the present disclosure. Figures 1-3 The throw load device 200 is shown, and at the same time, the counterweight 100 is also shown. The structure of the counterweight 100 will be analyzed first, so as to facilitate the subsequent explanation of the throw load device 200.

[0031] Referring to the various drawings, the counterweight 100 includes a counterweight body 110, a hanging rod 120, and a hanging disc 130. The counterweight body 110 is the main part of the counterweight 100, which has a large volume and weight. The hanging rod 120 connects the counterweight body 110 to the hanging disc 130. The hanging disc 130 is a component for connecting the counterweight 100 to the throw load device 200.

[0032] Before the ejection device 200 does not perform the ejection operation, the ejection device 200 realizes the connection of the counterweight 100 and itself by limiting the hanging plate 130; when the ejection device 200 performs the ejection operation, it realizes the separation of the counterweight 100 and itself by releasing the limitation of the hanging plate 130, that is, realizes the ejection of the counterweight 100.

[0033] It should be noted that the counterweight 100 shown in the figures is only an example. In actual application, the counterweight 100 can be co-designed according to the shape of the underwater equipment to meet the requirement of surface streamline design of the underwater equipment to reduce the resistance.

[0034] As shown in the drawings, Figure 2 The main body of the hanging plate 130 in the embodiment of the disclosure is inverted trapezoidal in cross section, and the surface where the two sloping sides of the trapezoid are located is a wedge surface. After the hanging device releases the limitation of the hanging plate 130, the wedge surface of the hanging plate 130 slides downward to separate from the ejection device 200.

[0035] It should be noted that the structure of the hanging plate 130 here is only a special example, and in other embodiments, the hanging plate 130 can also have other shapes and structures.

[0036] Please refer to Figure 3 In the embodiment of the disclosure, the lower side of the hanging plate 130 is provided with a pin hole, and the upper side of the hanging rod 120 is also provided with a pin hole. The pin passes through the pin holes in the hanging plate 130 and the hanging rod 120 to realize the connection of the hanging plate 130 and the hanging rod 120. The purpose of connecting the hanging plate 130 and the hanging rod 120 by the pin is to facilitate the installation of the counterweight 100 on the ejection device 200 (which will be described later), and to avoid the problem of stress concentration or excessive stress caused by direct rigid connection.

[0037] The hanging device is described below. Please refer to the drawings, the ejection device 200 provided by the embodiment of the disclosure includes a platform body 210, an extension frame 220, a first lever 230, a metal pull rod 240, a positive electrode connecting end 250 and a negative electrode connecting end 260.

[0038] The platform body 210 is a component for bearing other components and realizing the fixed connection of the ejection device 200 and the underwater operation equipment. The platform body 210 can be made of metal plate, and the surface thereof can be provided with a hole area or a hollow area for accommodating other components.

[0039] The extension frame 220 is arranged on the lower side of the platform body 210, and is arranged in a spaced-apart manner relative to the platform body 210 at least in some positions to leave space for installation of the metal pull rod 240. In some embodiments, the extension frame 220 can have a U-shaped structure including two side rod portions and a middle rod portion; the two side rod portions are directly connected to the platform body 210, and the middle rod portion is arranged in a spaced-apart manner relative to the platform body 210.

[0040] The first lever 230 is installed on the platform body 210 through a first rotation shaft. When the first lever 230 is not limited, the first lever 230 can rotate relative to the platform body 210 about the first rotation shaft. The first lever 230 includes a first supporting end 231 and a pull rod connecting end 232. The first supporting end 231 is used to support the weight 100 (specifically, the mounting disc 130 in the weight 100), and the pull rod connecting end 232 is used to connect the metal pull rod 240.

[0041] As the name implies, the metal pull rod 240 is a pull rod made of metal material. The metal pull rod 240 is used as a sacrificial anode in active electrochemical corrosion. In specific applications, the metal pull rod 240 can be made of a metal material that is relatively stable in chemical properties and structural strength under non-energized conditions, but is relatively active in chemical properties as a sacrificial anode under energized conditions. For example, the metal pull rod 240 can be made of stainless steel material.

[0042] The metal pull rod 240 includes a first end connected to the pull rod connecting end 232, a second end connected to the extension frame 220, and a corrosion dissolution portion 241 located between the first end and the second end. The corrosion dissolution portion 241 is a portion that is directly corroded and dissolved and can be dissolved when the metal pull rod 240 is directly used as a sacrificial anode. In specific implementations, the entire metal pull rod 240 can be subjected to surface insulation coating treatment, and only the middle region is exposed to the metal substrate to form the corrosion dissolution portion 241.

[0043] The positive electrode connecting end 250 is a connecting end connected to the positive electrode of the power supply. The positive electrode connecting end 250 is directly electrically connected to the metal pull rod 240, so that the metal pull rod 240 becomes a sacrificial anode in active electrochemical corrosion.

[0044] The negative electrode connecting end 260 is a connecting end connected to the negative electrode of the power supply. The negative electrode connecting end 260 is insulated and isolated from the metal pull rod 240. The insulation and isolation mentioned here means that the negative electrode connecting end 260 cannot be directly electrically connected to the metal pull rod 240 to avoid the metal pull rod 240 from becoming a sacrificial anode. However, the negative electrode connecting end 260 can be electrically connected to the metal pull rod 240 through the surrounding water.

[0045] As shown in the various figures, without triggering the throw-off (that is, without the positive terminal 250 and the negative terminal 260 being connected to the power supply), the metal pull rod 240 connects the pull rod connecting end 232 of the first lever 230 and the extension frame 220 at both ends, achieving the limiting of the first lever 230. At this time, the first bearing end 231 bears the hanging plate 130, so that the counterweight 100 cannot be separated from the throw-off device.

[0046] After triggering the throw-off, the positive terminal 250 is connected to the positive terminal of the power supply, and the negative terminal 260 is connected to the negative terminal of the power supply, so that the metal pull rod 240 is corroded and dissolved as a sacrificial anode in a high-conductivity water environment such as seawater. As the metal pull rod 240 is corroded and dissolved, its cross-sectional size (in particular applications, the cross-sectional size of the corrosion and dissolution part 241) gradually decreases. Since part of the weight of the counterweight 100 acts on the metal pull rod 240 through the first lever 230, the metal pull rod 240 will be plastically deformed until it is pulled off when it is corroded and dissolved to the extent that it cannot bear the aforementioned part of the weight. After the metal pull rod 240 is pulled off, the first lever 230 cannot maintain the moment balance under the action of the aforementioned part of the weight, and the first bearing end 231 rotates downward relative to the first rotation axis under the action of the weight of the counterweight 100, thereby releasing the limiting of the hanging plate 130, so that the counterweight 100 is released by the throw-off.

[0047] The embodiment of the present application enables the metal pull rod 240 to form a sacrificial anode and be corroded and pulled off by energizing the positive terminal 250 and the negative terminal 260, thereby releasing the limiting of the metal pull rod 240 on the first lever 230 and the hanging plate 130, and achieving the release of the counterweight 100 by the throw-off. Because the aforementioned process of triggering the release of the counterweight 100 is achieved by electrochemical corrosion of the metal pull rod 240 and a simple lever structure, the reliability of the throw-off execution can be ensured.

[0048] The embodiment of the present application uses the metal pull rod 240 as a sacrificial anode in the electrochemical corrosion process. In actual applications, since the platform body 210, the extension frame 220 and the first lever 230 are all metal parts, if the platform body 210, the extension frame 220 and the first lever 230 are directly in conductive contact with the metal pull rod 240, the throw-off platform, the extension frame 220 and the first lever 230 will also become sacrificial anodes that are corroded, and the strength of these components will decrease after multiple uses, or even be scrapped. To solve this problem, in some embodiments, the first end and the second end of the metal pull rod are both provided with insulating isolation members, and the aforementioned first end is insulated and isolated from the first lever 230 by the insulating isolation member, and the second end is insulated and isolated from the extension frame 220 by the insulating isolation member, thereby avoiding being used as a sacrificial anode when energized.

[0049] In addition, in some embodiments, the negative electrode contact end 260 can also be arranged on the extension frame 220, the first lever 230 or the platform body 210. In this way, the aforementioned metal parts can be protected by the action of the electrons provided by the negative electrode of the power supply. In a specific implementation, the negative electrode contact end 260 can be made of an inert metal and arranged directly on the extension frame 220, the first lever 230 or the platform body 210. Considering that the extension frame 220 and the platform body 210 do not move in various cases, the negative electrode contact end 260 is preferably arranged on the extension frame 220 or the platform body 210.

[0050] It is mentioned above that the first supporting end 231 of the first lever 230 supports the hanging plate 130 and releases the limitation on the hanging plate 130 after the metal pull rod 240 is broken. The following analysis is about how the first supporting end 231 limits the hanging plate 130 when the metal pull rod 240 is not broken and releases the limitation on the hanging plate 130 after the metal pull rod 240 is broken.

[0051] This section of analysis can refer to the accompanying drawings, but does not directly correspond to the accompanying drawings. In some embodiments, the first supporting end 231 of the first lever 230 is a wedge-shaped end with the wedge surface facing upward. In addition to the first lever 230 and the extension frame 220, the throw plate platform also includes a limiting cooperation part arranged opposite to the first supporting end 231. After the metal pull rod 240 is connected to the pull rod connecting end 232 and the extension frame 220 at both ends, the first supporting end 231 is fixed, and the hanging plate 130 can be arranged on the first supporting end 231, and the wedge-shaped cooperation part on the surface of the hanging plate 130 is attached to the wedge surface of the first supporting end 231 and is pressed against the limiting cooperation part by the first supporting end 231. Due to the cooperation of the limiting cooperation part and the first supporting end 231, the limitation of the hanging plate 130 is achieved.

[0052] Similar to the accompanying drawings, in some embodiments, the limiting part on the throw plate platform can be a wedge-shaped part fixed on the platform body 210 and with the wedge surface facing upward. The limiting cooperation part on the corresponding hanging plate 130 is a wedge-shaped cooperation part with the wedge surface facing downward. In addition, in other embodiments, the limiting part and the limiting cooperation part are not limited to the aforementioned wedge-shaped structure, but can also be a rectangular structure and the like, and the shape structure of the corresponding hanging plate 130 also needs to be adjusted accordingly.

[0053] In other embodiments, the first supporting end 231 of the first lever 230 can also be an end supported by a horizontal plane. Correspondingly, the hanging plate 130 placed directly on the first supporting end 231 can be fixed by limitation.

[0054] Please continue to refer to the various drawings. In some embodiments, the throw-off device 200 can include an electromagnetic switch 270 and a second lever 280 in addition to the aforementioned first lever 230, metal pull rod 240 and positive and negative electrical connection ends. The electromagnetic switch 270 and the second lever 280 form another set of throw-off trigger mechanism that triggers the release of the counterweight 100.

[0055] The electromagnetic switch 270 is fixedly installed on the platform body 210, and the working end is provided with a latch. When the electromagnetic switch 270 is actuated, the internal core moves axially against the action of the internal spring force, driving the latch to move in the axial direction of the latch.

[0056] The second lever 280 is installed on the platform body 210 and can rotate relative to the platform body 210 about a second rotation axis. The second lever 280 includes a latch connection end 282 and a second support end 281 disposed on both sides of the second rotation axis, respectively. The latch connection end 282 is provided with a latch hole 283. The second support end 281 is used to limit the mounting disc 130.

[0057] When the electromagnetic switch 270 is in a non-actuated state, the latch is inserted into the latch hole 283, so that the second lever 280 is fixedly limited relative to the platform body 210, and the second support end 281 can limit the mounting disc 130. When the electromagnetic switch 270 is actuated so that the latch is disengaged from the latch hole 283, the second lever 280 is rotated about the second rotation axis under the action of the gravity of the counterweight 100, and the second support end 281 releases the limitation of the mounting disc 130, achieving the throw-off of the counterweight 100.

[0058] In specific embodiments, the electromagnetic switch 270 preferably uses a normally-off switch. The normally-off switch has the following working characteristics: when not powered, the elastic force of the return spring acts on the movable core, making the movable core protrude longer, making the latch protrude longer, and the latch disposed on the free end of the movable core can be inserted into the latch hole 283; when powered, the electromagnetic force generated by the electromagnetic action on the internal movable core overcomes the elastic force of the return spring, and the movable core retracts, making the latch protrude out of the latch hole 283.

[0059] Of course, in other embodiments, the electromagnetic switch 270 can also use a normally-on switch, and only in the case of power failure, the latch at the free end of the movable core protrudes out of the latch hole 283.

[0060] As shown in the figure, in some embodiments, the first rotation axis is parallel to the second rotation axis, the first supporting end 231 and the second supporting end 281 are both wedge-shaped ends, and the wedge-shaped surfaces of the first supporting end 231 and the second supporting end 281 both face upwards. When the metal pull rod 240 is not broken and the bolt is inserted into the bolt hole 283, the first supporting end 231 and the second supporting end 281 are oppositely arranged to limit the mounting disc 130 and form a mounting space for accommodating the mounting disc 130. Referring to the figure, the cross section of the body of the mounting disc 130 is the same as the cross section of the mounting space. After the mounting disc 130 is placed in the mounting space, the mounting disc 130 is fixed by the first supporting end 231 and the second supporting end 281, and the bottom part extends out of the mounting space to be connected with the mounting rod 120.

[0061] When the metal pull rod 240, the first lever 230, the electromagnetic switch 270 and the second lever 280 are simultaneously arranged, if the metal pull rod 240 is broken by electrochemical corrosion or the bolt is separated from one of the bolt holes 283, the limiting mounting space formed by the first supporting end 231 and the second supporting end 281 is destroyed, and the mounting disc 130 is no longer limited, so that the unloading of the counterweight 100 can be achieved.

[0062] As analyzed and shown in the figure, in some embodiments of the unloading device 200, the first rotation axis is parallel to the second rotation axis, and the first supporting end 231 and the second supporting end 281 are oppositely arranged. In other embodiments, the first rotation axis and the second rotation axis can also be arranged in a cross direction (for example, perpendicular). Correspondingly, the first supporting end 231 and the second supporting end 281 are not oppositely arranged. In this case, the limiting part is arranged on the opposite side of the first supporting end 231 and the second supporting end 281, which can limit and fix the mounting disc 130 of the same counterweight 100, and when the metal pull rod 240 is broken by electrochemical corrosion or the bolt is separated from one of the bolt holes 283, the mounting disc 130 of the counterweight 100 can be released.

[0063] When the counterweight 100 is on the water bottom during underwater operation, the mounting disc 130 of the counterweight 100 can be separated from the mounting space due to the thrust. After the mounting disc 130 is separated from the mounting space, it can not be returned to the mounting space. In this case, even if the mounting disc 130 is released by the method of electrochemically corroding the metal pull rod 240 or releasing the bolt from the bolt hole 283, the mounting disc 130 can be limited by other parts, so that the unloading of the counterweight 100 cannot be achieved.

[0064] Referring to Figure 1The weight throwing platform in some embodiments of the present disclosure further comprises a limiting cover plate 290. The limiting cover plate 290 is arranged at the upper portion of the accommodating space, and limits the mounting disc 130 arranged in the accommodating space from moving out of the accommodating space when subjected to an upward external force, thereby avoiding the problem that the mounting disc 130 cannot be implemented with counterweight 100 throwing due to being limited by other components when disengaging from the accommodating space.

[0065] In actual application, when the weight throwing device 200 is configured with the aforementioned two sets of limiting disengaging devices, the limiting disengaging device formed by the electromagnetic switch 270 and the second lever 280 is the main limiting disengaging device, and the limiting disengaging device formed by the metal pull rod 240 and the first lever 230 is the standby limiting disengaging device. The standby limiting disengaging device is activated when the main limiting disengaging device fails to correctly perform the limiting disengaging operation.

[0066] The following analyzes how the weight throwing device 200 in the embodiments of the present disclosure is used (including how to install the counterweight 100). First, the metal pull rod 240 is respectively connected with the pull rod connecting end 232 of the first lever 230 and the extension frame 220 at both ends, and the latch of the electromagnetic switch 270 is inserted into the latch hole 283 of the second lever 280, so that the supporting ends of the first lever 230 and the second lever 280 are opposite to each other, forming an accommodating space; then the mounting disc 130 is placed into the accommodating space from the upper portion, and the pin shaft hole of the mounting disc 130 is exposed at the lower side of the accommodating space; then the limiting cover plate 290 is installed; finally, the mounting disc 130 and the mounting rod 120 are connected through the pin shaft, achieving the installation of the counterweight 100 (that is, the mounting disc 130 and the mounting rod 120 are connected by the pin shaft, and the step-by-step installation of the counterweight 100 can be achieved).

[0067] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A throw device, characterized in that The device comprises: a platform body, an extension frame, a first lever, a metal pull rod, a positive electrode connection end and a negative electrode connection end; the extension frame is arranged on the lower side of the platform body; the first lever is installed on the platform body and rotates relative to the platform body around a first rotation axis; the first lever comprises a first supporting end and a pull rod connecting end; the first supporting end is used for limiting and fixing the counterweight; the first end of the metal pull rod is connected with the pull rod connecting end, and the second end is connected with the extension frame; the positive electrode connection end is directly conductively connected with the metal pull rod, and the negative electrode connection end is insulated from the metal pull rod; after the positive electrode connection end and the negative electrode connection end are electrified to cause the metal pull rod to be electrochemically corroded to break in a water body environment, the first supporting end is subjected to the gravity of the counterweight to make the first lever rotate around the first rotation axis, thereby realizing the weightless release of the counterweight.

2. The device according to claim 1, wherein: the extension frame and the first lever are metal pieces; the first end and the second end are both provided with insulating isolation pieces; the first end is insulated from the first lever through the insulating isolation piece, and the second end is insulated from the extension frame through the insulating isolation piece.

3. The device according to claim 2, wherein: the negative electrode connection end is arranged on the extension frame or the first lever.

4. The device according to any one of claims 1-3, wherein: the first supporting end of the first lever is a wedge-shaped end with an upward wedge surface; the platform body comprises a limiting part arranged opposite to the first supporting end; the first supporting end is fitted with a wedge-shaped matching part on the counterweight hanging disc, and the limiting matching part of the hanging disc abuts against the limiting part, so as to realize the limiting fixation of the hanging disc and the limiting fixation.

5. The device according to claim 4, wherein: the limiting part is a wedge-shaped part with an upward wedge surface; the limiting part is limited with a limiting matching part with a downward wedge surface on the hanging disc.

6. The device according to any one of claims 1-3, further comprising: an electromagnetic switch arranged on the weightless platform; the working end of the electromagnetic switch is provided with a latch; the weightless platform further comprises a second lever; the second lever is installed on the platform body and rotates relative to the platform body around a second rotation axis; the second lever comprises a latch connecting end and a second supporting end; the latch connecting end is provided with a latch hole; the second supporting end is used for limiting and fixing the counterweight; the electromagnetic switch makes the latch protrude out of the latch hole when it is actuated. in the case that the latch is inserted into the latch hole, the second lever is fixed relative to the platform body; in the case that the electromagnetic switch makes the latch disengage from the latch hole, the second supporting end is subjected to the gravity of the counterweight to make the second lever rotate around the first rotation axis, thereby realizing the weightless release of the counterweight.

7. The device according to claim 6, wherein: the first rotation axis is parallel to the second rotation axis. The first supporting end and the second supporting end are wedge-shaped ends, and wedge-shaped surfaces of the first supporting end and the second supporting end are upwardly directed; In the case that the metal pull rod is not broken and the bolt is inserted into the bolt hole, the first supporting end and the second supporting end are oppositely arranged to form a containing space for containing the counterweight mounting disc.

8. The apparatus of claim 7, wherein: The throw-weight platform further comprises a limiting cover plate arranged at an upper portion of the containing space for limiting the mounting disc from moving out of the containing space.

9. The apparatus of claim 6, wherein, The electromagnetic switch is a normally-off switch that causes the bolt to be separated from the bolt hole when energized.

10. A passive floatation device, characterized in that The apparatus comprises a throw-weight device as claimed in any one of claims 1-9, and a counterweight arranged at the first supporting end.

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