50results about How to "Reduce homework workload" patented technology

The invention discloses a construction method of a wall putty of a plaster-free concrete structure. The construction method comprises the following steps: construction preparation, base course treatment, concave-convex line construction, a first full application of wall putty, flattening, a second full application of wall putty and flattening. The construction method has the advantages of less workload, short construction time, little resource consumption, no hollow drum and crack of the floated coat, no crack at the joint of the primary structure and the secondary structure.

The invention relates to a sprayed concrete which contains cement, sand-stone mixture, steel fiber, accelerating agent and special additive. The special additive is inorganic neutral nano-sized zeolite containing SiO2 and Al2O3 as major chemical components, wherein the weight ratio of water to cement to sand-stone mixture to steel fiber is (8.5-8.6):(16.1-20.0):(69.6-73.5):(1.7-1.8), the special additive accounts for 5-10% the weight of cement, and the accelerating agent accounts for 6-8% the weight of cement. When used in water-rich areas, the sprayed concrete can cure within 1minute and exhibits strength after 10 minutes, the rebound rate of the sprayed concrete is reduced to 7.8% from 15% in the common wet-jetting concrete, the binding strength reaches 3.5 MPa, and the spray thickness is more than 0.3 m at each time. The invention reduces the workload of lining concrete construction and avoids water leakage, and also has the advantages of rapid construction, good flexibility and improvement in working environment inside tunnel.

The invention relates to an offshore self-elevating drilling platform pile pitching and pile pulling automatic control device and method. The offshore self-elevating drilling platform pile pitching and pile pulling automatic control device comprises a displacement sensor, a force sensor, a computer detection control system, a ballast pump switch and a pile washing valve, wherein the displacement sensor and the force sensor are arranged on a chord member of a pile leg, the ballast pump switch is arranged at a ballast pump control system of a ballast tank, the pile washing valve is arranged on a pile shoe and is connected with a pile washing pipeline. The displacement sensor and the force sensor are respectively used for measuring the driving depth of a pile body, the bearing capacity of the pile leg and a pile pulling force and transmitting the measured data in pile pitching and pile pulling processes into a computer detection control system to be processed, whether the bearing capacity of the pile in the pile pitching process is maximum or not, whether pile washing is required in the pile pulling process and whether the pile is completely pulled out are automatically judged, and the ballast pump switch, the pile washing valve and a pile pulling operation control switch are controlled according to the judging result, thus realizing the offshore self-elevating drilling platform pile pitching and pile pulling automatic control.

The invention discloses a device and a method for monitoring the penetration of a marine petroleum pipe and pile hammering-in method. The pipe or pile comprises a pile body and a pile follower arranged at the top of the pile body. The monitoring device comprises a penetration sensor and a computer control system, wherein the penetration sensor is arranged on the pile follower and used for recording the penetration depth of the pile body; piling process data recorded by the penetration sensor is transmitted to the computer control system and processed through a penetration control software program; and the program can automatically judge whether a reasonable penetration depth of the drilling pipe or pile is reached or not according to a processing result, and a hammering power switch is controlled according to a judging result. The invention can be used for scientifically monitoring the penetration depth in real time, guiding a marine piling construction process and reducing marine accidents caused by improper piling of a drilling riser.

The invention belongs to the technical field of oil production technology in petroleum and natural gas industries, and particularly relates to a bilayer separate injection process pipe column device for a nonmetal continuous oil pipe. The bilayer separate injection process pipe column device comprises the nonmetal continuous oil pipe and injection quantity adjusting devices, a first water injection passage and a second water injection passage which are symmetric according to the center of the nonmetal continuous oil pipe are arranged in the nonmetal continuous oil pipe, the injection quantity adjusting devices are arranged at the starting ends of the first water injection passage and the second water injection passage respectively, and the first water injection passage and the second water injection passage are both connected with the injection quantity adjusting devices through adapters. By the bilayer separate injection process pipe column device, an original process of using a water distributor for layered water injection is replaced, so that anticorrosion and antiscaling effects are realized. Flow adjusting is performed on the ground, so that sundry downhole testing and adjusting work is omitted, downhole accidents occurring in the testing and adjusting work are eliminated, and effective injection quantity is guaranteed for each layer.

An outdoor unit (1) for an air conditioner is equipped with: a cabinet (10) which forms an outer covering; angle bars (20) which are disposed inside the cabinet (10); a fan (3) driven by a drive motor (5) which is supported by the angle bars (20); and a heat exchanger (2) which exchanges heat with outdoor air supplied by the fan (3). The drive motor (5) has a first support section (5c) and a second support section (5d) projecting from the peripheral surface of a cylindrical housing (5b). The angle bars (20) are provided with L-shaped engaging sections (22d), each of which has a projecting section (22e) projecting from a vertically arranged surface (22a) and a front surface section (22f) which curves away from the projecting section (22e) and which is integrated with the vertically arranged surface (22a) at the periphery of a through-hole (22b) which is formed in the vertically arranged surface (22a) to pass through the cylindrical housing (5b). The first support section (5c) is engaged by the engaging sections (22d) so as to be positioned between the front surface section (22f) and the vertical surface (22a), and the second support section (5d) is fixed to the vertical surface (22a) with screws.

The invention discloses a detection method and system for on-board equipment of a locomotive. The detection period and the maintenance period of the on-board equipment of the locomotive are prolonged,the workload of workers is reduced, and the production operation efficiency is improved. The technical scheme comprises: an on-board equipment analysis process, a locomotive warehousing detection process and a detection and alarm process, wherein the on-board equipment analysis process carries out fault diagnosis of the on-board equipment based on the collected data of the on-board equipment, andgenerates a fault alarm signal of the on-board equipment; the locomotive warehousing detection process judges whether the locomotive is warehoused or not based on the warehousing judging mode and / orthe locomotive positioning mode; and the detection and alarm process carries out detection and alarm on the fault alarm signal generated by the on-board equipment based on the result of the on-board equipment analysis process and the result of the locomotive warehousing detection process under the condition of locomotive warehousing.

The invention relates to the technical field of oil and gas exploitation, and discloses a casing pipe device capable of reducing casing pipe shear deformation and a using method thereof. The casing pipe device is arranged at a shaft at the position where a crack zone is located and comprises a casing pipe, an upper centralizer and a lower centralizer, and the upper centralizer and the lower centralizer are arranged on the outer walls of the two ends of the casing pipe; a metal layer is arranged on the outer wall of the casing pipe, and a water swelling rubber layer is arranged on the outer wall of the metal layer. The using method of the casing pipe device comprises the following steps that 1) the shaft at the position, where the crack zone is located, in a stratum is determined through amicroseism method; (2) the casing pipe device is tripped in, the casing pipe device reaches the position where the crack zone is located, water circulation is conducted on the shaft, and the water swelling rubber layer is made to swell; and 3) cement is injected into the casing pipe and a borehole annulus, and well cementation operation is completed; In the process of reducing the shear deformation of the casing pipe, the thickness of a cement sheath is increased, and the metal layer with radial compressibility and the water swelling rubber layer are additionally arranged, so that the casuingpipe shear deformation caused by stratum slippage can be effectively prevented or reduced.

The invention relates to a safety trip device for a fracturing string. The upper portion of an inner suspending pipe is milled into strip bodies, the strip bodies are suspended on a suspending circular bead in an outer suspending pipe, an upper seal ring, a middle seal ring and a lower seal ring are installed on a lock sleeve, the lock sleeve is sleeved with a spring, the lock sleeve is installed into the outer suspending pipe, and the outer wall of the lock sleeve stops that milled strip bodies on the upper portion of the inner suspending pipe; the lower portion of an upper connector is connected with the upper portion of the outer suspending pipe, a kerf is formed in the upper portion of the lock sleeve, a part of the kerf is installed into the upper connector, and the outer suspending pipe is connected through a lock pin; the upper seal ring is located above the spring, the middle seal ring is located between the spring and the lock pin, the lower portion of the lock sleeve is inserted into the inner suspending pipe, the gap between the lock sleeve and the inner suspending pipe is sealed by the lower seal ring, and the lower seal ring is located below the milled strip bodies on the upper portion of the inner suspending pipe; a communicating groove is formed in the inner suspending pipe, a sliding sleeve upper seal ring and a sliding sleeve lower seal ring are installed on a sliding sleeve, and the sliding sleeve covers the communicating groove in the inner suspending pipe and is fixed by a sliding sleeve shear pin.

The invention relates to a protector for oil pipe working under pressure used for oil well and a method for tubing oil string under pressure. The invention provides the protector for oil pipe working under pressure used for oil well at first, which includes a body, an upper joint, a lower joint, a seal ball, a seal ball tube, a ball holding room and an inhibiting device. The protector for oil pipe working under pressure used for oil well provided by the invention has a simple and rational structure, can work under pressure when tubing the oil string in the oil well, can avoid adopting killfluid to pollute a hydrocarbon reservoir, thereby protecting the hydrocarbon reservoir, but also can guarantee the safety during the operating process of tubing the oil string, and can not cause blowout.Moreover, the protector for oil pipe working under pressure used for oil well provided by the invention can open an operating channel by only needing to implement pressing operation so as to transferinto the oil well production state after finishing the operation of tubing the oil string and mounting a Christmas tree, and has the characteristics of less operating procedures and simple operations, etc, which greatly reduces the work load, saves the operating cost and reduces the production cost.

A method for replacing a tower foot of a transmission tower is characterized in that the method comprises the following specific steps that 1, a supporting device is connected to the position betweenthe tower foot where a to-be-replaced tower foot is located and main iron; 2, a steel wire protective rope is connected to the position between the main iron where the to-be-replaced tower foot is located and the bottom of the supporting device in a fastened mode, and the main iron where the to-be-replaced tower foot is located is supported through the supporting device; 3, a main iron bolt and atower footing bolt which are connected to the to-be-replaced tower foot are disassembled, and the to-be-replaced tower foot is removed; 4, dust on the upper surface of a tower footing where the to-be-replaced tower foot is located is cleaned up, the main iron where the to-be-replaced tower foot is located is subjected to rust removing, and the main iron is coated with anti-rust paint; 5, the new tower foot is installed on the upper surface of the tower footing through the tower footing bolt, and the upper end of the new tower foot is connected to the main iron through the main iron bolt; and 6, the supporting device and the steel wire protective rope which are connected to the position between the tower footing and the main iron are disassembled. According to the method for replacing the tower foot of the transmission tower, the operating strength can be reduced, the construction occupied area is decreased, the labor cost is reduced, electrified replacement is achieved, and normal electricity utilization of enterprises and residents is ensured.

The invention discloses a bidirectional bias cutting device of a triple-side book cutting machine, which can use one cutter to cut three sides of books, wherein a cylinder fixed front base is respectively connected at the upper parts of a left and a right front vertical plates, a cylinder rotating base is arranged between the cylinder fixed front base and a gantry rack, and a paper cutting cylinder is inversely arranged at the cylinder rotating base; pin roll sleeve holes are respectively arranged at the positions close to the two ends of the upper parts of the left and the right front vertical plates, a first left cutting positioning cylinder, a first right cutting positioning cylinder, a second left cutting positioning cylinder and a second right cutting positioning cylinder are linked at the upper part of the back of the gantry rack in the way of corresponding to the four pin roll sleeve holes, the piston rod end parts of the four positioning cylinders are respectively sleeved with a swing pin roll, the four swing pin rolls are sleeved in the pin roll sleeve holes in a one-to-one correspondence way, left paper cutting swing arms are respectively sleeved on the two swing pin rolls at the left part, right paper cutting swing arms are respectively sleeved on the two swing pin rolls at the right part, and the lower parts of the left and the right paper cutting swing arms are connected with a cutter body; and the piston rod head of the paper cutting cylinder is connected with a drive pin roll, and the drive pin roll is pivoted with the middle part of a tool rest body. The device is applicable to cutting the stapled books.

The invention relates to a spring self-switched Y-shaped joint which is characterized in that: the joint comprises a joint body, wherein, one side of the joint body is provided with a production channel and a test channel in a communication way and the other side thereof is provided with an electric pump oil-pumping channel; the upper part of the electric pump oil-pumping channel is provided with an oblique oil-pumping channel communicated with the production channel, a slideway hole is transversally arranged between the test channel and the electric pump oil-pumping channel, one end of the slideway hole, which is close to the electric pump oil-pumping channel, is fixed to be connected with an end cover and a pressure-transmitting hole is arranged at the center of the end cover; a sealing sliding block, the head of which faces the test channel is arranged in the slideway hole; an extension spring which is corresponding to the head shape of the cylindrical sealing sliding block is arranged between the end cover and the sealing sliding block; a sealing slot is arranged on the pipe wall of the test channel, and screw threads which connect pipelines are respectively arranged at the upper end part of the production channel, the test channel and the lower end part of the electric pump oil-pumping channel. The joint has simple structure and convenient operation, and can be widely used in an oil drilling system.

The invention relates to a spring self-switched Y-shaped joint which is characterized in that: the joint comprises a joint body, wherein, one side of the joint body is provided with a production channel and a test channel in a communication way and the other side thereof is provided with an electric pump oil-pumping channel; the upper part of the electric pump oil-pumping channel is provided withan oblique oil-pumping channel communicated with the production channel, a slideway hole is transversally arranged between the test channel and the electric pump oil-pumping channel, one end of the slideway hole, which is close to the electric pump oil-pumping channel, is fixed to be connected with an end cover and a pressure-transmitting hole is arranged at the center of the end cover; a sealingsliding block, the head of which faces the test channel is arranged in the slideway hole; an extension spring which is corresponding to the head shape of the cylindrical sealing sliding block is arranged between the end cover and the sealing sliding block; a sealing slot is arranged on the pipe wall of the test channel, and screw threads which connect pipelines are respectively arranged at the upper end part of the production channel, the test channel and the lower end part of the electric pump oil-pumping channel. The joint has simple structure and convenient operation, and can be widely used in an oil drilling system.

The invention discloses a single-trip flushing and two-way filling sand control pipe column. The single-trip flushing and two-way filling sand control pipe column comprises a top hanging packer, a top filling server, a two-stage closing bottom filling device, a flushable bottom flushing server and an inner filling pipe column which are connected in sequence. The sand control pipe column has the advantages that the sand control pipe column is flushed in a single-trip and two-way filling manner, the sand control pipe column can be put down while being flushed, a tool is directly set after the sand control pipe column is in place, and a filling hole is opened to implement bottom gravel filling operation; after the first stage is completed, the well is back flushed, a steel ball is put into a wellhead, a top filling hole is opened, and second-stage gravel filling is performed to ensure annulus gravel filling saturation; and hands are released to pull out the filling pipe column. The whole process is completed at a time, the operation workload is greatly reduced, the well occupying time is shortened, and the measure effect is guaranteed.

The invention discloses a complex site large rectangle pile stirrup pre-splicing construction method, and relates to the field of stirrup construction. In order to achieve the aim, the method comprises the following steps of firstly, measuring setting out and pile position fixing; secondly, lock opening constructing; thirdly, pile hole excavating and supporting; fourthly, rock-socketed segment pile hole excavating; fifthly, supporting course detecting and pile hole acceptance check; sixthly, making auxiliary ribs for pre-splicing stirrups; seventhly, stirrup pre-splicing and lowering while splicing; eighthly, main rib lifting, positioning and binding; ninthly, ultrasonic acoustic detection tube mounting; and tenthly, pile core concrete pouring. Main ribs and stirrups of a steel reinforcement cage can achieve factory machining stirrup pre-splicing distribution, the stirrups can be in whole welding hooping splicing, on site, a stirrup cage is bound on a hole opening, influences of the main ribs are avoided, and the splicing speed is high.

The invention discloses a supporting frame of a sliding mold. The support frame comprises two frame bomolds, an adjusting assembly and a plurality of middle supporting rods are connected between the two frame bomolds, wherein the adjusting assembly comprises a first threaded rod, a rotating rod and a second threaded rod, one end, away from the rotating rod, of the first threaded rod is connected with one frame body, one end, away from the rotating rod, of the second threaded rod is connected with the other frame body, and the two ends of the middle supporting rods are connected with the two frame bomolds correspondingly; and the bottom end of each frame body is provided with a plurality of foundation jacks, four hydraulic jacks and at least three pulleys, the hydraulic jacks are distributed at the four corners of the bottoms of the frame bomolds, and driving devices used for driving the pulleys are arranged on the frame bomolds. According to the supporting frame of the sliding mold, the construction efficiency of constructing a comprehensive pipe gallery through cast-in-place concrete is effectively improved, the operation workload is reduced, and meanwhile the working intensity ofconstruction workers is reduced.

The invention discloses an arc-shaped cross frame and round pipe connection quality control method. An arc-shaped cross frame and round pipe connection structure comprises four arc-shaped chord members and one web member, wherein a tubular joint is arranged at the joint of each arc-shaped chord member and the web member; each tubular joint comprises a welded toe part, a welded edge part and a welded root part; a straight probe with the frequency of 2.5MHz is selected and used for performing flaw detection on the outer surface of the joint of the arc-shaped chord member and the web member to detect the welded toe part and the welded edge part; when a detection result of the welded toe part and the welded edge part is that the welded toe part and the welded edge part are free of longitudinal and transverse defects, the welded toe part and the welded edge part are qualified; an angle probe with a nominal refraction angle of 70 degrees is selected and used for detecting the welded root part; and when the welded root part is free of transverse defects, the welded root part is qualified. According to the method, the degree of operation of performing welding reinforcement on the web member and the chord members can be controlled in a proper time, so that the welding deformation caused by excessive welding reinforcement is avoided.

The invention provides a surrounding type field watermelon harvester. The surrounding type field watermelon harvester comprises a surrounding header device, a conveying and discharging system, a cab, a stock bin machine body, a buffering and collecting device, an impurity discharging fan, a stock bin, a main machine frame, a vine removing fan and a walking system. The conveying blanking system, the cab, the stock bin machine body and the melon vine stock bin are installed on the main machine frame, and the walking system is installed below the main machine frame. The surrounding header device is connected with one end of the conveying and blanking system, and the other end of the conveying and blanking system is connected with one side of the stock bin machine body. The buffer collecting device is located in a stock bin of the stock bin machine body, and an inlet of the buffer collecting device communicates with the other end of the conveying and discharging system. The impurity discharging fan is installed on the other side of the stock bin machine body, and the vine removing fan is installed on one side of the stock bin machine body. The watermelon harvester reduces the labor intensity of workers, has certain stability and reliability, is low in failure rate, realizes efficient harvesting of watermelons, and improves the harvesting efficiency.

The invention belongs to the technical field of mechanical oil extraction, and particularly provides a nonmetallic flexible composite continuous pipe oil extraction device which comprises a wellhead hanger, a conversion joint, an oil pump, a screen pipe and a screwed plug. The conversion joint, the oil pump, the screen pipe and the screwed plug are connected sequentially from top to bottom. The oil pump is connected with the wellhead hanger through an oil pumping rod, a nonmetallic composite pipe is connected between the wellhead hanger and the conversion joint, and the oil pumping rod penetrates the inside of the nonmetallic composite pipe. A metal oil pipe is replaced by the nonmetallic composite pipe, so that construction workload is lowered substantially, labor intensity of construction personnel is lowered, anticorrosion capability of a pipe column is improved, normal production time is increased, and production pipe column structure is simplified.

The invention relates to the field of grain storage, and discloses an automatic film embedding machine. The automatic film embedding machine comprises a machine case (7), wherein a guide wheel (6), afirst squeezing wheel (4), a second squeezing wheel (3) and a pressing wheel (1) are arranged on the machine case (7) from right to left; the distance between the first squeezing wheel (4) and the second squeezing wheel (3) is 2-20mm; a convex ring (601) used for pressing a groove mark on a film sleeve (27) is arranged on the guide wheel (6); the first squeezing wheel (4) and the second squeezingwheel (3) are used for squeezing a rubber tube (26) to be flat; and a groove (1011) used for pressing the rubber tube (26) into a groove tube (28) is arranged on the pressing wheel (1). The automaticfilm embedding machine further comprises a motor (23) and an axle (8), wherein a first transmission belt wheel (10) is arranged on the axle, and the motor (23) is connected with the first transmissionbelt wheel (10) through a first conveying belt (9). The automatic film embedding machine has the effects that the fingers of workers are protected, the working efficiency is improved, and the workload is reduced.

An outdoor unit (1) for an air conditioner is equipped with: a cabinet (10) which forms an outer covering; angle bars (20) which are disposed inside the cabinet (10); a fan (3) driven by a drive motor (5) which is supported by the angle bars (20); and a heat exchanger (2) which exchanges heat with outdoor air supplied by the fan (3). The drive motor (5) has a first support section (5c) and a second support section (5d) projecting from the peripheral surface of a cylindrical housing (5b). The angle bars (20) are provided with L-shaped engaging sections (22d), each of which has a projecting section (22e) projecting from a vertically arranged surface (22a) and a front surface section (22f) which curves away from the projecting section (22e) and which is integrated with the vertically arranged surface (22a) at the periphery of a through-hole (22b) which is formed in the vertically arranged surface (22a) to pass through the cylindrical housing (5b). The first support section (5c) is engaged by the engaging sections (22d) so as to be positioned between the front surface section (22f) and the vertical surface (22a), and the second support section (5d) is fixed to the vertical surface (22a) with screws.

The invention discloses a cofferdam type pipe rod conveying and discharging device. The conveying and discharging device is composed of five cofferdams and comprises a near-end auxiliary material frame, a main material frame, an auxiliary material frame and a far-end auxiliary material frame, the five cofferdams are each arranged to be a rectangular block, are sequentially arranged from left to right and are mutually fixed through rapid buckles, four stand columns with lifting adjusters are arranged at the bottoms of the four corners of the outer sides of the main material frame and the auxiliary material frame, the upper top ends of the front stand column and the rear stand column are each provided with a rectangular guide rail, the middle of the top face of each rectangular guide rail is provided with a rack, the front rectangular guide rail and the rear rectangular guide rail are each provided with a rectangular traveling mechanism matched with the guide rails to move, two output shafts of a speed reducer are respectively connected with couplings of two rolling mechanisms arranged on the two guide rails, and the rolling mechanisms are provided with drag chains which are mutually hinged with drag chain rods; grabbing manipulators consisting of manipulator support frames, hydraulic cylinders, shear fork frames and electric permanent magnets are respectively arranged below the front middle part and the rear middle part of the traveling mechanism; and a lifting machine for receiving and sending a pipe rod to a wellhead is longitudinally arranged on the right side of the near-end auxiliary material frame.

The invention relates to a protector for oil pipe working under pressure used for oil well and a method for tubing oil string under pressure. The invention provides the protector for oil pipe working under pressure used for oil well at first, which includes a body, an upper joint, a lower joint, a seal ball, a seal ball tube, a ball holding room and an inhibiting device. The protector for oil pipe working under pressure used for oil well provided by the invention has a simple and rational structure, can work under pressure when tubing the oil string in the oil well, can avoid adopting killfluid to pollute a hydrocarbon reservoir, thereby protecting the hydrocarbon reservoir, but also can guarantee the safety during the operating process of tubing the oil string, and can not cause blowout.Moreover, the protector for oil pipe working under pressure used for oil well provided by the invention can open an operating channel by only needing to implement pressing operation so as to transferinto the oil well production state after finishing the operation of tubing the oil string and mounting a Christmas tree, and has the characteristics of less operating procedures and simple operations, etc, which greatly reduces the work load, saves the operating cost and reduces the production cost.

The invention discloses a method for elimination and inhibition of hydrogen sulfide in oil well production. The method comprises a measure for processing a water well tube pillar and a water injection near-well zone, as well as a measure for processing an oil well tube pillar and a near-well zone of oil well tube pillar. The method disclosed by the invention has the advantages that generation of the hydrogen sulfide during the oil well production can be eliminated and inhibited efficiently and safely; the method has good effects and a long-term measure validity period especially for the inhibition of hydrogen sulfide which is generated from bacteria breeding; the maximum decrease rate of the hydrogen sulfide concentration reaches 99.68%; the method disclosed by the invention can obviously reduce the hydrogen sulfide concentration at different well temperatures; and a green and environment-friendly bactericide can be selected during biologic inhibitor selection of the method disclosed by the invention, so that fewer influences are brought to environments. The method is an economic, practical and environment-friendly technological measure for controlling the hydrogen sulfide generation.

The invention provides an externally-hung connecting device for prefabricated wallboard installation and a prefabricated wallboard installation method. The externally-hung connecting device comprisesan upper connecting assembly and a lower connecting assembly. The upper connecting assembly comprises a first anchor plate, a first threaded connecting rod, a first L-shaped connecting plate fixedly connected with a lower flange of an upper steel frame beam, a first heat insulation base plate and a first fixing nut. The first threaded connecting rod penetrates through the first L-shaped connectingplate and the first heat insulation base plate to be connected with a first fixing nut. The lower connecting assembly comprises a second anchor plate, a second threaded connecting rod, a second L-shaped connecting plate fixedly connected with a floor slab steel bar, a second heat insulation base plate and a second fixing nut. The second threaded connecting rod penetrates through the second L-shaped connecting plate and the second heat insulation base plate to be connected with the second fixing nut. The externally-hung connecting device can safely and reliably achieve fixed installation of aprefabricated wallboard, can achieve rapid installation on the premise that production standardization of the prefabricated wallboard is achieved, reduces the workload of construction site operation,and improves the construction efficiency and the installation quality.