53results about How to "Effective pressure relief" patented technology

The invention discloses a microphone wind noise prevention apparatus and an electronic device. The apparatus comprises a first cavity, a second cavity and a communication channel, the first cavity communicates with a pickup hole of an external device, the communication channel is used for communicating the first cavity with the second cavity, and the second cavity communicates with a sound hole of a microphone; and the microphone wind noise prevention apparatus further comprises a pressure relief hole communicating the first cavity with the external environment. One technical problem to be solved in the invention is that the wind noise of the existing microphone is large. One use of the microphone wind noise prevention apparatus provided by the invention is applied to the electronic device.

The invention discloses a microphone wind noise prevention device and electronic equipment. The device comprises a first sound hole, a second sound hole, a first cavity, a second cavity and a connecting channel. The first sound hole and the second sound hole are communicated through the first cavity. The first cavity is internally provided with a first flow blocking part which is opposite to the first sound hole and a second flow blocking part which is opposite to the second sound hole. The connecting channel is used for connecting the first cavity and the second cavity. The second cavity is communicated with a microphone sound hole. The entrance of the connecting channel is arranged between the first flow blocking part and the second flow blocking part. One technical problem to be solved is high wind noise of the present microphone body. One application of the microphone wind noise prevention device is used for the electronic equipment.

The invention relates to flame-guard filters (F) consisting of a number of layer sequences (S1, S2, S3), wherein each of the layer sequences (S1, S2, S3) consists of filter layers (1, 2) arranged on top of each other. Each layer sequence (S1, S2, S3) consists of a first filter layer (1) and of a second filter layer (2), each made of a material arranged in a lattice formation and having openings (1.1, 2.1), each with an opening width (1.11, 2.11). The first filter layer (1) having a free side face (6.3) is a first end-filter layer (3) with a first end- filter opening width (3.11), and the second filter layer (2) having a free side face (6.4) is a second end-filter layer (4) with a second end-filter opening width (4.11). The second opening width (2.11) of a second filter layer (2) is smaller than the first opening width (1.11) of a first filter layer (1). The second filter layer (2) is opaque. The invention further relates to an arrangement (10) of at least two flame-guard filters (F1, F2), and also to a housing (9) which is encapsulated in a pressure-resistant manner and has at least one flame-guard filter (F, F1, F2).

The invention discloses a reversing valve, a hydraulic actuator reversing control loop and an engineering machine. The reversing valve comprises a valve body which is at least provided with an oil feed port (P), an oil return port (T), a first working oil port (A) and a second working oil port (B), wherein a valve element (102) is arranged in a valve element matching cavity of the valve body, a moving stroke range of the valve element at least comprises a first working position, a second working position and a middle position, the first working position, the second working position and the middle position are used for controlling the reversing of a hydraulic actuator, the moving stroke range of the valve element at least further comprises a first transition position, and at the first transition position, the first working oil port (A) and the second working oil port (B) are both communicated with the oil return port (T). The reversing valve has a special transition function, the valve element of the reversing valve is made to pass through the first transition position in the reversing process of the valve element of the reversing valve from the first working position to the middle position to enable low oil pressure or no oil pressure is remained in the first oil port of the reversing valve, and high pressure is formed and maintained in the first working oil port when the middle position is impacted by pressure.

The invention provides a pressure relief device of a switch cabinet and the switch cabinet, and relates to the technical field of electrical equipment. The pressure relief device of the switch cabinetcomprises a cabinet top plate, a pressure relief plate and a plurality of arcing baffles, wherein bent edges are arranged on two opposite sides of each arcing baffle to form a buffer cavity; a pressure relief chamber is formed in the cabinet top plate and penetrates the cabinet top plate, the plurality of arcing baffles are all arranged in the pressure relief chamber, arc relief gaps are left between adjacent arcing baffles, and the bent edges of the arcing baffles are opposite to the buffer cavities of the adjacent arcing baffles; the pressure relief plate covers the pressure relief chamber,the first side edge of the pressure relief plate is fixedly connected with the cabinet top plate, the second side edge of the pressure relief plate is detachably connected with the cabinet top plate,and the first side edge is opposite to the second side edge. The technical problem of potential safety hazards in pressure relief of switch cabinets in related technologies is solved by the pressurerelief device of the switch cabinet.

The invention discloses a boiler smoke waste heat recovering device which comprises a smoke box and a water tank. The water tank is located above the smoke box. A partition plate is arranged between the smoke box and the water tank. The smoke box and the water tank are arranged integrally with the partition plate. The smoke box is provided with a gas input pipe used for conveying smoke, and an exhausting pipe used for exhausting the smoke. The gas input pipe and the exhausting pipe are fixedly connected with the smoke box. Gravity heat pipes used for transferring heat are arranged in the smokebox and are distributed at equal distances. The ends of the gravity heat pipes are in bolt connection with the smoke box. A soot groove used for piling soot is arranged under the gravity heat pipes.The soot groove is detachably connected with the smoke box. An electric cylinder is arranged on the left side of the soot groove. The electric cylinder is provided with a pushing plate. The pushing plate is in bolt connection with the electric cylinder. A soot opening used for discharging the soot is formed in the right side of the soot groove. The boiler smoke waste heat recovering device can effectively clear the soot.

The invention discloses an integrated intelligent combination box-type substation. The substation comprises a fuse combination cabinet, and a tripping interlock is arranged between a mechanism area and a triangular fuse tube area of the fuse combination cabinet; the triangular fuse tube area is provided with a door plank, and a mechanical interlock is arranged between the mechanism area and the door plank; a grounding system for a fuse tube is arranged inside the triangular fuse tube area; the bottom of a shell of the fuse combination cabinet is a shell bottom layer, and the shell bottom layeris a double-layer plate; the fuse combination cabinet is located inside a substation outer box, a transformer is arranged below the fuse combination cabinet, a cable connection box is arranged at theleft side of the fuse combination cabinet, and a low-voltage cabinet is arranged at the right side of the fuse combination cabinet; and the fuse combination cabinet and the transformer are connectedthrough a plurality of E-shaped connectors. The substation has the advantages of effective waterproofness, high safety, effective grounding, effective relief and effective connection.

The invention discloses an explosion-proof utility tunnel. The utility tunnel comprises a gas pipe trench, a rainwater storage tank, a vent panel, water-proof rubber rings and an integrated pipe tank, wherein the gas pipe trench is arranged between the rainwater storage tank and the integrated pipe tank, and divided into an upper part and a lower part by a baffle, and a gas pipe is located on the upper part of the gas pipe trench; a wall that is shared by the gas pipe trench and the rainwater storage tank downwards extends to the bottom of the utility tunnel body, and the bottom of the wall is longitudinally and evenly provided with a row of openings along the utility tunnel; the baffle of the gas pipe trench is longitudinally and evenly provided with a row of explosion vents along the utility tunnel; and the vent panel is combined with the water-proof rubber rings for sealing the explosion vents. In case of explosion of the gas pipe trench, explosion pressure can be reduced rapidly due to damage of the vent panel and the damping and energy absorption of rainwater in the rainwater storage tank; and after explosion, professionals enter the utility tunnel and repair the part, where accidents occurred, of the gas pipe trench. Gas pipelines can be included in the explosion-proof utility tunnel with high explosion-proof capability, and the safety of the gas pipelines entering the utility tunnel is improved.

The invention relates to the technical field of diesel injection system control, and particularly discloses a control method of an electric control pressure release valve in a diesel engine fuel system. A rail pressure control structure of the diesel engine fuel system comprises an electric control unit, an oil pump, an oil rail, a proportional flow valve, the electric control pressure release valve and a rail pressure sensor, wherein the oil pump is connected to the oil rail, the proportional flow valve is arranged on the oil pump, the electric control pressure release valve and the rail pressure sensor are both arranged on an oil rail, the proportional flow valve, the electric control pressure release valve and the rail pressure sensor are all electrically connected to the electric control unit, the control method of the electric control pressure release valve in the diesel engine fuel system comprises the following steps that a current working condition of an engine is obtained; and the electric control pressure release valve is correspondingly controlled according to different states of the current working condition of the engine. According to the control method of the electric control pressure release valve in the diesel engine fuel system, the defects that a leakage-free fuel injector is poor in rail pressure following performance under the working condition of reversed towing of an engine, and pressure cannot be released during shutdown are overcome.

The invention relates to a multi-coal-seam rock burst prevention and control method for ground drilling pressure relief. Firstly, coal drawing pressure relief of an uppermost coal seam is conducted through construction ground coal drawing directional drilling, elastic energy accumulation is prevented, and effective pressure relief is formed for tunneling of a roadway and stoping of a working face. Furthermore, a thick and hard rock stratum in whole overlying rock is subjected to horizontal layered fracturing through ground hydraulic fracturing, the rock stratum induced rock burst problem is solved, meanwhile, roof rock stratums on the two sides of the haulage roadway can be cut off through roof cutting work, that is, the working face to be stoped is separated from an area which is not stoped, and overlying rock stratum force of the area which is not stoped is prevented from acting on the working face to be stoped. In addition, the crushing and swelling amount is effectively increased through manual construction of a horizontal fracturing and swelling layer, supporting of the overlying rock stratum is increased, and sinking of the overlying stratum is reduced. Pressure relief of a mining protection layer is generated on a next coal seam through mining of the upper coal seam, and a foundation is provided for tunneling and stoping of the next coal seam.

The invention relates to a pipeline filter, which is a filter built into a pipeline and belongs to the field of filters. channel, a filter is set on the filtering channel. This structure can effectively relieve the pressure of the filter, prevent the filter from being damaged due to excessive pressure, and affect the normal filtration of the filter. The design of the pressure relief channel can avoid damage to the filter when the pressure in the pipe is not balanced. , At the same time, this structure can ensure the smooth flow of the passage when the filter is blocked, and prevent the rupture of the pipe body caused by excessive pressure in the pipe body. A valve body is arranged on the pressure relief passage. The design of the valve body can control the flow of the pressure relief channel. The design of the valve body can prevent the filter from being filtered well and ensure the effective filterability of the filter. In addition, the valve body can effectively control and adjust both sides of the filter. pressure difference.

This invention discloses a method for depressuring gas in ground drilled well and mining area. Before extracting coal a ground drilling well is drilled from ground to long distance, low breathing, high gas, projecting and soft covered seams, then extracting down seam. The gas from the up covered seam is exhausted from pipe.

The invention provides a pressure-relief-reinforcement cooperative maintenance method for a roadway under a boundary coal pillar, relates to the technical field of mining engineering, and solves the technical problem of roadway support under the boundary coal pillars. The method includes the steps that firstly, the cracking range of an overlying boundary coal pillar is determined, and then a proper cracking method is selected to damage the overlying boundary coal pillar; then, fracturing coal bodies are constructed at the two sides of the roadway, so that stress at the two sides of the roadwayis transferred to a deep part; and the two sides of the roadway are reinforced and supported by using anchor cables, so that plastic areas of the two sides of the roadway below the overlying boundarycoal pillar form a new bearing anchoring area under the action of the reinforcing anchor cables. The cracking range of the boundary coal pillar is determined according to the width of the roadway, the minimum horizontal distance between the boundary of the roadway and the edge of the overlying boundary coal pillar and the like, and cracking construction parameters, cracking ranges of the two sides and the construction parameters are calculated according to actual geological conditions. According to the pressure-relief-reinforcement cooperative maintenance method for the roadway under the boundary coal pillar, the fracturing range is reasonably determined through calculation, so that the construction technical difficulty is reduced, and the method further has the advantages of high roadwaystability and the like.

The invention discloses a cable joint protection box. The cable joint protection box includes a shell, the shell comprises a protection cavity which is used for protecting a cable joint, and the protection cavity is provided with a penetrating opening which penetrates through the inside and the outside and is used for penetrating a cable; and the shell is provided with a heat dissipation hole penetrating into the protection cavity from the outer side. A heating expansion plug is fixed in the heat dissipation hole; and the heating expansion plug is provided with a ventilation hole penetrating through the interior and the exterior. The heating expansion plug can expand to seal the ventilation hole to seal the heat dissipation hole when the environment temperature reaches a first preset temperature value, and the heating expansion plug can be separated from the heat dissipation hole in the pressure difference direction when the internal pressure is increased until the internal and external pressure difference reaches a preset pressure difference. The heating expansion plug is closed when the internal temperature is too high, fire spreading is effectively prevented, the heating expansion plug can be bounced off under high pressure, and shell explosion is prevented through pressure relief, so the service life is effectively prolonged, and a better fireproof ventilation effect is achieved.

The invention discloses equipment and method for exploiting coalbed methane by kilometer drilling and subsection water explosion fracturing, and belongs to the field of engineering. The equipment comprises a kilometer drilling machine (1), wherein the kilometer drilling machine (1) excavates to form a vertical drill hole (2), a horizontal drill hole (3) intersected with the vertical drill hole (2), and a high drainage roadway (7) not intersected with the vertical drill hole (2), the horizontal drill hole (3) is located in a coal seam, a plurality of hydrothermal cracking cylinders (4) are arranged in the horizontal drill holes (3), and the high-pressure drainage roadway (7) is located in the center line of a blasting fissure zone above the coal seam. According to the equipment, the problems that existing coal mining equipment is not economical, not environmentally friendly, heavy and the like are solved, a novel water explosion fracturing technology is applied to coal mining operation,the fracturing range is effectively widened, pressure is more effectively relieved, coal bed gas desorption and gas production channel formation are more effectively promoted, meanwhile, water resources used by the water explosion fracturing technology are fewer, and the used ionic aqueous solution does not cause pollution and is simple and efficient to implement.

The invention relates to a safe induction valve. A valve core is arranged in a valve body; an annular sealing ring is arranged between the middle part of the valve core and an inner convex ring of the valve body; the annular sealing ring divides the valve body into an upper cavity and a lower cavity; one side of the middle part of the valve body is provided with a locking device; an electromagnetic valve is arranged in the valve body on the upper part of the valve core; and a pressure adjusting mechanism is also arranged in the valve body. The invention also relates to a safe buffer double-purpose valve applying the safe induction valve with the structure, wherein the center of an upper valve cap is provided with a damping hole, the lower end of the valve body is provided with a lower valve cap, and the center of the lower valve cap is provided with a damping hole. The combined application of the induction valve and the safe buffer double-purpose valve can replace an atmospheric valve, a safety valve and an electric unloading valve simultaneously. The induction valve and the safe buffer double-purpose valve have the advantages of simple structure, reliable running, convenient use, wide application and low price.

The invention discloses a fire extinguishment system and a fire extinguishment method in a fabrication bin of an electrochemical energy storage station based on gas extinguishment and mechanical ventilation and heat dissipation. The system comprises automatic gas extinguishment systems, a pressure relief system and a mechanical ventilation and heat dissipation system. The automatic gas extinguishment systems are correspondingly positioned at the two sides of two rows of battery cabinets in order to realize precise automatic fire extinguishment when thermal runaway occurs in a lithium ion battery; the pressure relief system is positioned above the short side of the prefabrication bin and can be automatically started for relieving the pressure when the pressure inside the prefabrication binis too high; the mechanical ventilation and heat dissipation system consists of an air charging fan, an exhausting fan and a water mist sprayer which are positioned at the two short sides of the prefabrication bins and are in diagonal distribution; and the mechanical ventilation and heat dissipation system is controlled by virtue of a smoke sensor and a pressure sensor so as to realize smoke discharging and temperature reduction functions. The fire extinguishment system and the fire extinguishment method disclosed by the invention can be used for quickly extinguishing a fire of a battery and discharging high-temperature smoke in time, thereby reducing the temperature of the battery and guaranteeing high-efficiency safe running of an energy storage system in the prefabrication bin.

A switch cabinet arcing pressure relief device comprises a breaker chamber pressure relief device, a bus chamber pressure relief device and a cable chamber pressure relief device. The pressure relief device comprises a pressure relief cover, a pressure relief frame, an arc-blocking honeycomb plate, a pressure relief screen plate, a hinge and a nylon bolt; one side of the pressure relief cover is connected to the pressure relief frame through a hinge, and the other side of the pressure relief cover is connected to the pressure relief frame through a nylon bolt. The pressure relief frame comprises a pressure relief frame front vertical plate, a pressure relief frame side vertical plate and a pressure relief frame reinforcing beam; the arc blocking honeycomb plate is arranged in the pressure relief frame and below the pressure relief screen plate; and the pressure relief screen plate is arranged in the pressure relief frame and above the arc-blocking honeycomb plate. When an internal fault arc is generated in the switch cabinet, the pressure release device can be reliably opened, the pressure release direction avoids an inspection tour channel and other equipment, the arcing device can be suitable for switch cabinets with different depths and widths, the number of fans can be increased or decreased to enhance ventilation, and the arcing device is safe and reliable and is applied to effective pressure release of the switch cabinet.

The invention relates to an inflaming retarding piece of an explosion-proof valve. The inflaming retarding piece comprises an annular piece body (1), an installation hole (2) is formed in the piece body (1), a plurality of bosses (7) are distributed on the front face of the piece body (1), are of a T structure and are evenly distributed in the circumference direction, and at least two circles of bosses (7) are arranged. Air flow channels with a plurality of bending parts are formed by gaps between the adjacent bosses (7). The bosses (7) on different circles on the piece body (1) are arranged in the radial direction in a parallel mode, and the bosses (7) are arranged in the same radial direction from the outer edge (6) to the inner edge (5) and are symmetrically crossed in the same circle. Compared with the prior art, the inflaming retarding piece is novel and simple in structure, the passing path of the air flow and the flame can be lengthened, the passing time of the air flow and the flame can be prolonged, the air flow can make full contact with all wall faces of the inflaming retarding piece to conduct heat exchanging, the temperature of the air flow is reduced, the flame is extinguished completely, and the problems that an inflaming retarding piece of an existing explosion-proof valve cannot extinguish the flame or release pressure quickly, effectively and reliably are solved.

The invention discloses an early warning device used for fire prevention and extinguishment in a building. The early warning device comprises a valve, a pressure relief port is formed in the left sideof the valve, fixed rods are arranged on the upper side and the lower side of the pressure relief port respectively, the right ends of the fixed rods are fixedly connected with the left side of the valve, a supporting plate is fixedly connected to the ends, away from the valve, of the fixed rods, two symmetrically-distributed telescopic rods are fixedly connected to the left side of the supporting plate, a pressure relief block is fixedly connected to the ends, away from the supporting plate, of the telescopic rods, a seal pad is arranged on the surface of the pressure relief block, the outerwalls of the telescopic rods are sleeved with first springs, the ends, away from the telescopic rods, of the first springs are fixedly connected with the left side of the pressure relief block, and first sliding blocks are fixedly connected to the upper side and the lower side of the pressure relief block respectively. Pressure relief can be performed inside the valve effectively, a pressure relief mechanism can be convenient to install and detach, and meanwhile the connecting position of a water pipe and the valve can be effectively prevented from loosening when water is introduced.

The invention discloses a multifunctional safety valve. The multifunctional safety valve comprises a valve seat and a valve element, wherein the valve seat is of a hollow structure, and the valve element is arranged in the valve seat in an up-down sliding mode; the valve core comprises a valve rod, a pressure spring and a sealing plug; a through hole is vertically formed in the valve rod; the inner wall of the through hole is provided with a mounting groove which is radially formed outwards; the sealing plug is arranged in the mounting groove in a vertical sliding mode and can cover the loweropening of the mounting groove; the maximum outer diameter of the sealing plug is smaller than the inner diameter of the mounting groove; and the upper end of the pressure spring abuts against the extension wall of the upper opening of the mounting groove, and the lower end of the pressure spring is arranged on the sealing plug and pushes the sealing plug to close the lower opening of the mountinggroove. When the body of a pressure cooker reaches high pressure, the safety valve can release pressure, so pressure in the pressure cooker body is prevented from continuously increasing, and the cooker body or food in the cooker body is thus prevented from damage caused by increasing pressure; the safety valve is provided with ultrahigh pressure protection, and when the pressure in the pressurecooker body reaches the ultrahigh pressure of 190 KPa-300 KPa, the safety valve can effectively release the pressure of the pressure cooker body.

A microphone wind noise preventing apparatus (10) and an electronic device. The apparatus (10) comprises a first sound hole (11), a second sound hole (12), a first cavity (13), a second cavity (14), and a communication channel. The first sound hole (11) and the second sound hole (12) are communicated with each other by means of the first cavity (13). A first flow blocking part opposite to the first sound hole (11) and a second flow blocking part opposite to the second sound hole (12) are provided in the first cavity (13). The communication channel is used for communicating the first cavity (13) with the second cavity (14). The second cavity (14) is communicated with a microphone sound hole (17). An inlet (19) of the communication channel is located between the first flow blocking part and the second flow blocking part. A technical problem to be solved is high wind noise of the existing microphone body. One application of the microphone wind noise preventing apparatus is used for the electronic device.

The invention discloses a coal seam horizontal well hydrodynamic jet reaming coal digging and bag supporting roadway-forming pressure relief method. The method comprises the following steps: hydrodynamic high-pressure jet reaming coal digging is conducted on a ground horizontal well to form a large-diameter drill hole, and part of energy in a coal seam is released through deformation and damage ofthe large-diameter drill hole to achieve an effective pressure relief effect, meanwhile the permeability and flow guiding capacity of coal mass around a shaft are also improved, compared with an existing pressure relief and outburst elimination mode that a large number of pressure relief drilled holes are constructed in a coal seam in an underground coal mine, the construction method is more efficient, economical and safer, setting and segmented supporting are achieved through a bag device, reamed pulverized coal is prevented from entering a reamed section at the front end, the pulverized coal can return to the ground advantageously, and therefore the coal-digging, pressure-relief and outburst-elimination effect is improved.

The invention relates to the field of petroleum drilling and production, and discloses a petroleum purification elevation angle type three-phase separator and a petroleum comprehensive treatment system, one end of a steel tank body is indirectly controlled to ascend and descend through a hydraulic cylinder, so that a corresponding tank body elevation angle is determined, and the smaller the tank body elevation angle is, the smaller the tank body elevation angle is. By arranging the oil-water separation coalescer, the separation proportion area of a gas-liquid mixture on the oil-water separation coalescer after the gas-liquid mixture enters the steel tank body is smaller, so that the separation rate is smaller, the separation rate is controllable, and by arranging the impurity removal pipe, the gas-liquid mixture can be filtered and purified by the filter before entering the gas-liquid inlet, so that larger solid impurities are prevented from entering the steel tank body, and the separation efficiency is improved. The advantages of the vertical separator are embodied, the pressure intensity in the steel tank body is detected in real time through the pressure intensity detector, if the internal pressure is too large, the controller controls the first electromagnetic valve to be closed and the second electromagnetic valve to be opened, a gas-liquid mixture is discharged into the pressure relief tank, and continuous pressurization, damage to internal elements of the steel tank body and the overflow phenomenon are avoided.

The invention is suitable for the technical field of coal mine excavation and provides stamping ground pressure relief equipment which comprises a supporting device, a pressure relief device and a conveying device. The supporting device comprises a supporting frame, an opening and closing device and anchor rods, the supporting frame comprises an arc-shaped section and a straight edge section, theopening and closing device comprises a fixing base, a rotating plate and a plurality of blocking pieces, a containing space and a moving groove are formed in the fixing base, a limiting groove is annularly formed in the rotating plate, and a limiting column and a fixing column are arranged on the blocking pieces; the pressure relief device comprises a pressure relief drill hole and a blasting part, and the blasting part is located at the tail end of the pressure relief drill hole; the conveying device comprises a bearing plate, a guide rod, a moving rod and a rotating rod, the plurality of anchor rods are arranged on the bearing plate, the width of a guide groove is smaller than the diameter of the anchor rods, the moving rod is vertically connected with the guide rod in a sleeve mode, andan ejection column is arranged on a sliding block and located under the guide groove. Therefore, effective supporting and pressure relief of a rock burst roadway can be achieved through the stampingground pressure relief equipment, and the safety quality of follow-up work is improved.

The invention discloses an auxiliary tool for ship hoisting. The auxiliary tool comprises a base plate, wherein the lower end of the base plate is fixedly provided with a supporting assembly, the lower end of the supporting assembly is welded with an upper protective plate, the lower end of the upper protective plate is connected with a lower protective plate through a pressure-bearing spring, thelower end of the lower protective plate is provided with a plurality of sets of universal wheels and hydraulic cylinders in sequence, an output end of each hydraulic cylinder is welded with a mounting seat, the lower end of each mounting seat is fixedly provided with a pressure-bearing steel plate, the two side walls of the upper end of the base plate are fixedly provided with guard rails respectively, and the outer walls of the guard rails are provided with LED lamps. The auxiliary tool for ship hoisting has the advantages that through the arrangement of the base plate, the supporting assembly, the upper protective plate, the pressure-bearing spring, the lower protective plate, a limiting pad, the LED lamps, the universal wheels, a baffle, a power box, a warning light, the hydraulic cylinders, a protective cylinder, the mounting seat and the pressure-bearing steel plate, the problems are solved that a current ship hoisting auxiliary tool is not flexible enough in use and low in functionality and an effective pressure-relief device is not provided.