Electric safety net

Abstract

In order to guarantee the quality and the service life of the electric safety net, the electric safety net is made of novel carbon fiber composite materials, and the electric safety net is good in shockproof performance, capable of effectively absorbing shock, better protecting personnel safety and capable of obtaining higher safety. Compared with a traditional metal safety net, carbon fibers have the advantages of being light in weight, resistant to corrosion, high in strength and the like, and stability and reliability of the safety net device in the using process are improved. The electric actuator of the device drives the safety net matched with the electric actuator to be put down or erected, when the driven safety net runs to the position required by control, the driving device stops output of driving torque, and the safety net is locked in the position state required by a control system through the built-in self-locking device of the driving device. Compared with a common safety net, the safety net has the advantages of being more convenient to use and safer, and manual folding and unfolding can be achieved through a wrench.

Description

Technical Field

[0001] The utility model relates to an electric safety net. Background Art

[0002] Most of the existing marine safety net devices use mechanical manual safety nets or centralized pump hydraulic safety nets.

[0003] The mechanical manual safety net requires the crew to lower or raise the safety net piece by piece during use, which takes a long time and is inconvenient to operate.

[0004] In actual use of centralized pump hydraulic safety nets, once the hydraulic pipeline or hydraulic pump station fails, the entire safety net will be unable to work and require manual operation; when the safety net fails and the operator needs to manually pull it up and put it down, due to the properties of the material of the net frame itself and its heavy weight, the operator is extremely inconvenient, time-consuming and labor-intensive to operate.

[0005] In addition, the traditional safety net power unit grid uses #20 seamless steel pipe. Although the surface of the grid is treated with anti-corrosion, it will still rust under the erosion of seawater, which seriously affects the service life and appearance of the safety net. Utility Model Content

[0006] The utility model aims to provide an electric safety net.

[0007] In order to solve the above problems, the utility model provides an electric safety net, comprising:

[0008] A first base fixed to the ground, wherein a positioning hole is provided on the first base;

[0009] The transmission short shaft of the electric actuator is sleeved in the positioning hole;

[0010] A safety net frame, wherein the safety net frame is made of carbon fiber, the bottom of the safety net frame is fixedly connected to a transmission short shaft, and the transmission short shaft of the electric actuator drives the safety net frame to be laid down or erected;

[0011] A flange is arranged on the safety net frame, and a frame mounting hole is arranged on the flange. Metal mesh wires are passed through the frame mounting holes to form a safety net.

[0012] Furthermore, in the above electric safety net, the electric actuator comprises: a motor, a gear box and a transmission short shaft, wherein:

[0013] The second rotating shaft of the motor is connected to the actuator limiting hole on the gear box;

[0014] A first rotating shaft and an intersecting shaft gear are arranged in the gear box, and the actuator limiting hole is arranged on the gear box, wherein one end of the first rotating shaft is connected to the actuator limiting hole, and the other end of the first rotating shaft is connected to one end of the intersecting shaft gear;

[0015] A transmission short shaft, the other end of the intersecting shaft gear is connected to the transmission short shaft, and the transmission short shaft is penetrated into the positioning hole of the first base.

[0016] Furthermore, in the above electric safety net, each set of safety net grid frame includes:

[0017] Six transverse carbon fiber tubes with flanges and four longitudinal carbon fiber tubes with flanges are assembled by gluing eight metal joints to form three connected rectangular frames. A grid mounting hole is provided on the flange of each carbon fiber tube. A metal bushing is provided on the grid mounting hole to protect the grid mounting hole. A metal wire is passed through the metal bushing to form a safety net.

[0018] The bottoms of the three connected rectangular frames form four intersection angles of transverse and longitudinal carbon fiber tubes, and a connecting plate is connected to the lower part of each intersection angle, wherein the connecting plate of one of the middle intersection angles is connected to the first base; and the connecting plates of the remaining three intersection angles are respectively connected to a second base.

[0019] Furthermore, in the above electric safety net, the first base comprises:

[0020] Two first ear plates are arranged at intervals, and the parts of the two first ear plates near the upper left corners are connected into one piece through the first connecting part. The bottom of each first ear plate can be connected and fixed to the ground by a third bolt, for example. Positioning holes are respectively arranged at the upper right corners of the two first ear plates arranged at intervals, and the transmission short shaft of the electric actuator is sleeved in the positioning holes.

[0021] A second ear plate, which is arranged between the gaps of the two first ear plates and sleeved on the transmission short shaft. The second ear plate is fixedly connected to the transmission short shaft by a first bolt to realize the laying down or erecting of the second ear plate; the top of the second ear plate is connected to a connecting plate at one of the middle intersection angles by a second bolt. When the second ear plate is laid down or erected, the safety net frame is driven to be laid down or erected.

[0022] Furthermore, in the above-mentioned electric safety net, a first fine-tuning hole is provided on the first connecting part, a first fine-tuning bolt is provided in the first fine-tuning hole, the first fine-tuning bolt is abutted against the bottom of the second ear plate, and the tilting angle of the second ear plate is fine-tuned by tightening or loosening the first fine-tuning bolt.

[0023] Furthermore, in the above electric safety net, each second base includes:

[0024] Two third ear plates are arranged relatively spaced apart, and the tops of the two third ear plates are connected into one piece through a third connecting portion; the third connecting portion is connected to one of the connecting plates of the remaining three intersection angles through a fourth bolt;

[0025] A fourth ear plate, the bottom of which is connected to the ground by a fifth bolt; the fourth ear plate is arranged between the gaps of the two third ear plates, and the fourth ear plate is connected to the two third ear plates by a rotating shaft, so as to realize the linkage operation of laying down or erecting the two third ear plates together with the first base; an arc-shaped limiting groove is also arranged on the fourth ear plate, and a roller is also connected between the two third ear plates, and the roller slides in the arc-shaped limiting groove to limit the laying down or erecting position of the safety net frame.

[0026] Furthermore, in the above electric safety net, a second fine-tuning hole is provided on the fourth ear plate at a position aligned with the top end of the arc-shaped limit groove, a second fine-tuning bolt is provided in the second fine-tuning hole, the second fine-tuning bolt abuts against the side wall of the roller in the arc-shaped limit groove, and the tilting angle of the fourth ear plate is fine-tuned by tightening or loosening the fine-tuning bolt;

[0027] A third fine-tuning hole is provided on the fourth ear plate at a position aligned with the bottom end of the arc-shaped limiting groove, and a third fine-tuning bolt is provided in the third fine-tuning hole. The third fine-tuning bolt is pressed against the side wall of the roller in the arc-shaped limiting groove, and the vertical angle of the fourth ear plate is fine-tuned by tightening or loosening the fine-tuning bolt.

[0028] Furthermore, in the above-mentioned electric safety net, a base limit block is also provided on the fourth ear plate, and the side wall of the fallen safety net frame abuts against the base limit block to prevent the safety net frame from falling excessively.

[0029] Furthermore, in the above-mentioned electric safety net, the motor is also connected to a manual mechanism, which is connected to a hand-cranked latch, so that the manual mechanism and the transmission short shaft are driven in sequence by the hand-cranked latch, thereby driving the safety net frame to be laid down or erected;

[0030] It also includes a locking pin, and the third ear plate and the fourth ear plate are respectively provided with locking holes, and the locking pin passes through the first third ear plate, the fourth ear plate and the second third ear plate in sequence to lock the fourth ear plate in an upright or laid down state.

[0031] Furthermore, in the above electric safety net, the control circuit connected to the electric actuator includes:

[0032] The live wire and neutral wire of the external power supply AC220 are connected to the terminal block TB1 in the electric control box, the live wire L and neutral wire N of the terminal block TB1 are connected to the filter FC, the neutral wire and live wire of the filter FC are connected to the eighth neutral wire switch and the ninth live wire switch of the power switch SW, the ninth live wire switch and the eighth neutral wire switch of the power switch SW are respectively connected to the eleventh live wire switch and the tenth neutral wire switch of the circuit breaker in the electric control box; the power indicator light is respectively connected to the two contacts of the circuit breaker;

[0033] One end of the two contacts of the first contactor and the second contactor is connected to the motor of the electric actuator, and the other end is connected to the eleventh live wire switch; the third end of the motor is connected to the neutral wire;

[0034] The first fuse is connected in series with the tenth neutral line switch; the second fuse is connected in series with the eleventh neutral line switch;

[0035] A first fuse and a second fuse are connected in series on one side of the step-down rectifier circuit, and a third fuse and a third fuse capacitor are connected in series on the other side of the step-down rectifier circuit;

[0036] The third fuse and the third fusing capacitor are connected to the touch screen respectively;

[0037] The touch screen is connected to the communication interface of the PLC via a communication line;

[0038] The power supplies L and N of the PLC are connected to the first fuse and the second fuse respectively;

[0039] PLC First The output terminal Q0.1 is connected to the first contactor;

[0040] PLC second The output terminal Q0.2 is connected to the second contactor;

[0041] PLC third Output terminal Q0.3 is connected to a buzzer;

[0042] The common terminal of the PLC is connected to the first fuse;

[0043] PLC First The input terminal I0.1 is connected to the seventh terminal of the terminal block;

[0044] PLC second The input terminal I0.2 is connected to the eighth terminal of the terminal block;

[0045] The signal feedback device of the motor is connected to the seventh terminal and the eighth terminal of the terminal row through a cable;

[0046] LC Third and Fourth Input terminals I0.3 and I0.4 are connected to the raising and lowering knobs on the door panel of the control box;

[0047] The common end of the vertical and horizontal knobs is connected to the 24V port of the PLC.

[0048] Compared with the prior art, in order to ensure the quality and service life of the safety net, the utility model designs a new composite material electric safety net device. The safety net material adopts a new carbon fiber composite material, which has good shockproof performance, can effectively absorb vibration, better protect personnel safety, and can obtain higher safety; compared with the traditional metal safety net, the carbon fiber itself has the characteristics of light weight, corrosion resistance, and high strength, which improves the stability and reliability of the safety net device during use; the device itself is equipped with a display light, which can alert platform personnel to avoid being hit or other accidents when the staff are active at night.

[0049] Specifically:

[0050] 1. Composite materials are light and corrosion-resistant. Compared with traditional safety grids, this grid uses new carbon fiber composite materials, and the weight of the safety net device can be reduced by 56%. Under the same structural design conditions, metal grids are severely corroded by seawater, and carbon fiber grids have better corrosion resistance.

[0051] 2. High strength and easy maintenance. On the basis of meeting the strength requirements, the strength of structures of different materials with the same thickness varies greatly. If the same size of safety net frame is set, the bearing weight of carbon fiber parts is about 1.5 times that of metal parts. The carbon fiber frame is superior to traditional metal materials in terms of strength.

[0052] 3. Strong applicability. Compared with traditional safety nets, this device uses a grid made of fabric + unidirectional fiber + epoxy resin cured into carbon fiber material. It has strong corrosion resistance and can adapt to various marine environments. Carbon fiber has good shockproof performance and can effectively absorb vibrations. The service life of the grid is increased, and higher safety can be achieved.

[0053] 4. Emergency operation is fast, flexible and convenient. The electric actuator of this device drives the safety net installed with it to "fall down" or "erect up". When the driven safety net runs to the position required by the control, the drive device stops the output of the driving torque, and its built-in self-locking device locks the safety net in the position state required by the control system. The electric actuator can mainly convert electrical energy into the rotational motion of the output shaft, thereby realizing the system control of the falling and erecting action of the safety net. The one-button operation is free to retract and accurately position. Compared with general safety nets, it is more convenient and safer, and can be manually retracted and released with a wrench. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of an electric safety net according to an embodiment of the utility model;

[0055] Figure 2This is a structural diagram of a carbon fiber grid of a composite electric safety net according to an embodiment of the utility model;

[0056] Figure 3 This is a schematic diagram of a composite electric safety net being laid down in accordance with an embodiment of the utility model;

[0057] Figure 4 It is a schematic diagram of a composite electric safety net erected with one key according to an embodiment of the utility model;

[0058] Figure 5 This is an electrical schematic diagram of a composite electric safety net according to an embodiment of the utility model;

[0059] Figure 6 It is a side view of a composite electric safety net according to an embodiment of the utility model;

[0060] Figure 7 It is a schematic diagram of a first base of an embodiment of the utility model;

[0061] Figure 8 It is a schematic diagram of a second base according to an embodiment of the utility model. DETAILED DESCRIPTION

[0062] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0063] like Figures 1 to 8 As shown, the utility model provides an electric safety net, comprising:

[0064] A first base 119 fixed to the ground, such as Figure 7 As shown, a positioning hole 120 is provided on the first base 119;

[0065] The transmission short shaft 121 of the electric actuator 113 is sleeved in the positioning hole 120;

[0066] The safety net frame 101 is made of carbon fiber. The bottom of the safety net frame 101 is fixedly connected to the transmission short shaft 121. The transmission short shaft of the electric actuator 113 drives the safety net frame 101 to be laid down or erected.

[0067] like Figure 2 As shown, a flange 122 is provided on the safety net frame 101, and a frame mounting hole is provided on the flange 122, and a metal mesh wire 111 is passed through the frame mounting hole to form a safety net.

[0068] Here, the ground may be, for example, a deck of a ship.

[0069] like Figure 1As shown, the utility model also includes: an electric control box door lock 103, a touch screen 104, an electric control box mounting hole 105, an electric control box warning light 106, an electric control box control button 107, an electric control box power line 108, an electric control box switch 109, and an electric control box signal line 110 connected to the motor.

[0070] The electrical control box is composed of a controller, a touch screen 104, an emergency stop button, a contactor, a relay, an electrical control button 107, an electrical control box warning light 106, a buzzer with sound and light alarm, etc.

[0071] The electric actuator 13 is composed of a motor, a housing, a manual mechanism, an indicator, a limit switch, etc. Figure 1 As shown: the electric control box touch screen 104, the electric control box door lock 103, the electric control box warning light 106, the electric control box control button 107, and the electric control box switch 109 are all installed on the surface of the electric control box. The electric control box control button 107 issues an operation command by controlling the electric actuator 113. The transmission short shaft 121 of the electric actuator 113 rotates and transmits the force to the safety net frame 1 through the first base 119 to realize the falling and erecting of a single group of safety nets. The signal feedback device of the electric actuator 113 completes the collection of the position status of the safety net to realize the falling and erecting of the safety net. The electric control box signal line 110 is used to connect the electric control box with the safety net junction box, and is used to control the signal feedback function of the safety net to ensure the stability of the safety net operation. The safety net frame 101 is connected to the base 119 by riveting. The advantage of riveting is that it is convenient for product installation and debugging. The safety net frame 101 is made of carbon fiber, which makes the overall frame device lighter and has better anti-corrosion effect. Display lights are installed at the frame sections to ensure the safety and reliability of personnel passing or platform work at night.

[0072] In an embodiment of the electric safety net of the utility model, the electric actuator 113 includes: a motor, a gear box and a transmission short shaft, wherein:

[0073] The second rotating shaft of the motor is connected to the actuator limiting hole on the gear box;

[0074] A first rotating shaft and an intersecting shaft gear are arranged in the gear box, and the actuator limiting hole is arranged on the gear box, wherein one end of the first rotating shaft is connected to the actuator limiting hole, and the other end of the first rotating shaft is connected to one end of the intersecting shaft gear;

[0075] The other end of the intersecting shaft gear is connected to the transmission short shaft, and the transmission short shaft 121 is inserted into the positioning hole of the first base 119.

[0076] Here, the intersecting axis gears may include spur gears and bevel gears.

[0077] The second rotating shaft of the motor sequentially drives the first rotating shaft of the gear box and the intersecting shaft gear, and further drives the rotation of the transmission short shaft.

[0078] In one embodiment of the electric safety net of the utility model, Figure 2 As shown, each set of safety net frame 101 includes:

[0079] Six transverse carbon fiber tubes 124 with flanges and four longitudinal carbon fiber tubes 125 with flanges are glued and assembled through eight metal joints 126 to form three connected rectangular frames. A grid mounting hole is provided on the flange 122 of each carbon fiber tube. A metal bushing 127 for protecting the grid mounting hole is provided on the grid mounting hole. A metal mesh wire 111 is passed through the metal bushing to form a safety net.

[0080] The bottoms of the three connected rectangular frames form four intersection angles of transverse and longitudinal carbon fiber tubes, and a connecting plate is connected to the lower part of each intersection angle, wherein the connecting plate 131 of one of the middle intersection angles is connected to the first base; and the connecting plates 135 of the remaining three intersection angles are respectively connected to a second base.

[0081] Specifically, the metal mesh wire 111 is passed through the rope threading hole. Considering that the carbon fiber material is not resistant to friction, the rope threading hole is equipped with a metal bushing to increase the service life of the safety net rope and ensure the stability and reliability of the force acting on the net rope.

[0082] like Figure 2 As shown in the figure, the safety net carbon fiber grid structure is assembled by gluing 10 carbon fiber tubes with flanges and 8 metal joints, and its material properties are shown in Table 1. The opening at the flange 122 is used to connect the metal mesh wire 111; the total weight of the structure is reduced by 46.7% compared with the original metal structure. A gravity load is applied to the carbon fiber grid within a certain range, and the position of the constraint point simulates the translational freedom of the support fixed constraint in the three directions of X, Y, and Z. The same force is applied to the node position within a certain area range. Through analysis, under the design load condition, the maximum deformation of the safety net is 28.87mm, and the maximum strain of the carbon fiber tube at the middle transverse carbon tube position is 3514με, the maximum compressive strain is -3290με, and the maximum shear strain is 1978με, which are all less than the material design allowable value and meet the design requirements. The maximum stress of the metal joint 126 without considering the stress concentration position is 74MPa, which is less than the yield strength of the material and meets the design requirements; the maximum stress of the metal bushing 117 without considering the stress concentration position is 107MPa, which is less than the yield strength of the material, and the carbon fiber grid meets the strength requirements.

[0083]

[0084]

[0085] Table 1 Carbon fiber grid strength verification results

[0086] like Figure 7 As shown, in one embodiment of the electric safety net of the utility model, the first base 119 includes:

[0087] Two first ear plates 128 are arranged at intervals, and the parts of the two first ear plates near the upper left corners are connected into one piece through the first connecting part 130. The bottom of each first ear plate 128 can be connected and fixed to the ground by a third bolt, for example. Positioning holes 120 are respectively arranged at the upper right corners of the two first ear plates 128 arranged at intervals, and the transmission short shaft 121 of the electric actuator 113 is sleeved in the positioning hole 120.

[0088] A second ear plate 129 is arranged between the gaps of the two first ear plates 128 and is sleeved on the transmission short shaft 121. The second ear plate 129 is fixedly connected to the transmission short shaft 121 by a first bolt to realize the laying down or erecting of the second ear plate 129; the top of the second ear plate 129 is connected to a connecting plate 131 at one of the intersection angles in the middle by a second bolt. When the second ear plate is laid down or erected, the safety net frame 101 is driven to be laid down or erected.

[0089] like Figure 7 As shown, in one embodiment of the electric safety net of the utility model, a first fine-tuning hole 130 is provided on the first connecting part, and a first fine-tuning bolt 132 is provided in the first fine-tuning hole, and the first fine-tuning bolt is abutted against the bottom of the second ear plate 129, and the tilting angle of the second ear plate is fine-tuned by tightening or loosening the first fine-tuning bolt 132.

[0090] like Figure 8 As shown, in one embodiment of the electric safety net of the utility model, each second base 123 includes:

[0091] Two third ear plates 132 are arranged relatively spaced apart, and the tops of the two third ear plates are connected into one piece through a third connecting portion 134; the third connecting portion 134 is connected to one of the connecting plates 135 of the remaining three intersection angles through a fourth bolt;

[0092] A fourth ear plate 133, the bottom of which is connected to the ground via a fifth bolt; the fourth ear plate 133 is disposed between the gaps of the two third ear plates 132, and the fourth ear plate 133 is connected to the two third ear plates 132 via a rotating shaft 136, so as to realize the linkage operation of laying down or erecting the two third ear plates 133 together with the first base 119; an arc-shaped limiting groove 137 is also disposed on the fourth ear plate 133, and a roller 138 is also connected between the two third ear plates 132, and the roller 138 slides in the arc-shaped limiting groove 137 to limit the laying down or erecting position of the safety net frame 101.

[0093] like Figure 8 As shown, in one embodiment of the electric safety net of the utility model, a second fine-tuning hole is provided on the fourth ear plate 133 at a position aligned with the top end of the arc-shaped limiting groove 137, and a second fine-tuning bolt 139 is provided in the second fine-tuning hole. The second fine-tuning bolt abuts against the side wall of the roller 138 in the arc-shaped limiting groove 137, and the tilting angle of the third ear plate 132 is fine-tuned by tightening or loosening the fine-tuning bolt.

[0094] A third fine-tuning hole is provided on the fourth ear plate 133 so as to be aligned with the bottom end of the arc-shaped limiting groove 137. A third fine-tuning bolt 140 is provided in the third fine-tuning hole. The third fine-tuning bolt 140 abuts against the side wall of the roller 138 in the arc-shaped limiting groove 137. The vertical angle of the third ear plate 132 can be fine-tuned by tightening or loosening the fine-tuning bolt.

[0095] like Figure 4 As shown, in one embodiment of the electric safety net of the utility model, a base limit block 117 is also provided on the fourth ear plate 133, and the side wall of the fallen safety net frame 101 abuts against the base limit block 117 to prevent the safety net frame from falling excessively.

[0096] Here, by setting the base limit block 117 on the fourth ear plate, the safety grid can be directly and accurately laid down, ultimately ensuring the safety distance of the safety grid.

[0097] Preferably, a safety net display light 2 is also provided on the top of the safety net frame 1.

[0098] like Figure 3 As shown, in one embodiment of the electric safety net of the utility model, a manual mechanism is also connected to the motor, and the manual mechanism is connected to the hand-cranked latch 114, so as to drive the manual mechanism, the internal components of the gear box, and the transmission short shaft in sequence through the hand-cranked latch 114, and then drive the safety net frame 101 to be laid down or erected.

[0099] Here, when the safety net is in a power-off state, the hand-cranked latch can be manually rotated to drive the intersecting shaft gears in the gear box inside the electric actuator, so that the transmission short shaft can rotate forward or reverse, thereby achieving the purpose of flipping the transmission short shaft, and then the purpose of driving the safety net frame can be achieved, realizing the action of lowering and erecting the safety net.

[0100] like Figure 8 As shown, in one embodiment of the electric safety net of the utility model, it also includes a locking pin 141, and the third ear plate 132 and the fourth ear plate 133 are respectively provided with locking holes, and the locking pin 141 passes through the first third ear plate, the fourth ear plate and the second third ear plate in sequence to lock the fourth ear plate in an upright or laid down state.

[0101] like Figure 5 As shown, in one embodiment of the electric safety net of the utility model, it also includes: a control circuit connected to the electric actuator 113, including:

[0102] The live wire (L) 1 and the neutral wire (N) 2 of the external point power supply AC220 are connected to the terminal block TB1 in the electric control box, the live wire L and the neutral wire N of the terminal block TB1 are connected to the filter FC, the neutral wire N1 and the live wire L1 of the filter FC are connected to the eighth neutral wire switch 8 and the ninth live wire switch 9 of the power switch SW, and the two switches of the power switch SW are respectively connected to the eleventh live wire switch 11 and the tenth neutral wire switch 10 of the circuit breaker Q in the electric control box; the power indicator light H0 is respectively connected to the two contacts of the circuit breaker Q (in series);

[0103] One end of the two contacts (KM1, KM2) of the first contactor and the second contactor are connected to the lines 4, 5 of the motor (M) of the electric actuator through the lines 15, 17, and the other end is connected to the eleventh live wire switch 11; the third end 3 of the motor is connected to the neutral line;

[0104] The first fuse (F1) is connected in series with the tenth neutral line switch 10; the second fuse (F2) is connected in series with the eleventh neutral line switch 11;

[0105] One side of the step-down rectifier circuit TZ is connected in series with the first fuse and the second fuse through lines 12 and 13, and the other side of the step-down rectifier circuit TZ is connected in series with the third fuse F3 and the third fuse capacitor F4 through lines 200 and 201;

[0106] The third fuse (F3) is connected to the touch screen 104 through the line 202 and the third fuse capacitor (F4) is connected to the touch screen 104 through the line 203;

[0107] The touch screen is connected to the communication interface of the PLC via a communication line;

[0108] The power sources L and N of the PLC are connected to the first fuse (F1) and the second fuse (F2) respectively;

[0109] PLC First The output terminal Q0.1 is connected to the first contactor KM1 via line 101;

[0110] PLC second The output terminal Q0.2 is connected to the second contactor KM2 via line 102;

[0111] PLC third The output terminal Q0.3 is connected to the buzzer BZ via line 107;

[0112] The common terminals 1M, 2M, 3M, and 4M of the PLC are connected to the first fuse (F1);

[0113] PLC First The input terminal I0.1 is connected to the seventh terminal TB1-7 of the terminal block TB1 through the line 207 for signal feedback;

[0114] PLC second The input terminal I0.2 is connected to the eighth terminal TB1-8 of the terminal block TB1 through the line 209 for signal feedback;

[0115] The signal feedback device of the motor (the signal that the travel switch is closed indicates that the erection or laying is in place and the disconnection is not in place) is connected to the seventh terminal TB1-7 and the eighth terminal TB1-8 of the terminal block TB1 through a cable;

[0116] PLC Third and Fourth Input terminals I0.3 and I0.4 are connected to the erection and laying down knobs SB1 on the door panel of the control box;

[0117] The common end of the upright and reclining knob SB1 is connected to the 24V port of the PLC through line 303.

[0118] Here, the electrical schematic diagram of the safety net device, such as Figure 5As shown, the electrical control box sends an erection operation instruction (knob SB1) to the electric actuator, so that the KM1 contactor is energized, the normally open contact of KM1 is closed, and the motor M is energized. The motor rotates to make the safety net perform an erection action, and the transmission short shaft 121 of the electric actuator 113 rotates, and the force is transmitted to the safety net through the first base to realize the erection action of the single-piece safety net. After the safety net is erected in place, the signal feedback device of the electric actuator completes the collection of the position status of the safety net, and feeds back the status to the electrical control box, and the electrical control box displays the downed status of the safety net. The electrical control box sends a down-running instruction to the electric actuator, so that the KM2 contactor is energized, the KM2 normally open contact is closed, and the motor M is energized. The motor rotates to make the safety net down, and the transmission short shaft 121 of the electric actuator rotates, and the force is transferred to the safety net through the base to realize the down-running action of the single-piece safety net. After the safety net is down, the signal feedback device of the electric actuator completes the acquisition of the position status of the safety net, and feeds back the status to the electrical control box, and the electrical control box displays the down-running status of the safety net. When the down-running or erecting time of the safety net exceeds the pre-set time, the safety net will send an alarm signal. From the beginning of down-running or erecting, the electrical control box software program sets the timing. If the electric actuator does not feed back the in-place signal to the electrical control box after the time is reached, the electrical control box will send a timeout alarm. The touch screen display on the electrical control box and the buzzer sound and light alarm.

[0119] The core technology of the new composite electric safety net device of the utility model is that it is made of carbon fiber material and is electrically controlled, that is, one-to-one control. Under this control mode, the safety net responds quickly. At the same time, the composite net frame is light in weight, and a single crew member can also put down and put up the safety net when the electric device fails. Remote control operation plan: When the helicopter needs to take off and land for a mission, turn the switch to the "automatic" position, operate the control knob, and the safety net can be put up / put down. The touch screen of the control box panel displays the status of the safety net (put up / put down / failure).

[0120] To sum up, in order to ensure the quality and service life of the safety net, the utility model designs a new composite material electric safety net device. The safety net material adopts a new carbon fiber composite material, which has good shockproof performance, can effectively absorb vibration, better protect personnel safety, and can obtain higher safety; compared with traditional metal safety nets, carbon fiber itself has the characteristics of light weight, corrosion resistance, and high strength, which improves the stability and reliability of the safety net device during use; the device itself is equipped with a display light, which can alert platform personnel to avoid being hit or other accidents when staff are active at night.

[0121] Specifically:

[0122] 1. Composite materials are light and corrosion-resistant. Compared with traditional safety grids, this grid uses new carbon fiber composite materials, and the weight of the safety net device can be reduced by 56%. Under the same structural design conditions, metal grids are severely corroded by seawater, and carbon fiber grids have better corrosion resistance.

[0123] 2. High strength and easy maintenance. On the basis of meeting the strength requirements, the strength of structures of different materials with the same thickness varies greatly. If the same size of safety net frame is set, the bearing weight of carbon fiber parts is about 1.5 times that of metal parts. The carbon fiber frame is superior to traditional metal materials in terms of strength.

[0124] 3. Strong applicability. Compared with traditional safety nets, this device uses a grid made of fabric + unidirectional fiber + epoxy resin cured into carbon fiber material. It has strong corrosion resistance and can adapt to various marine environments. Carbon fiber has good shockproof performance and can effectively absorb vibrations. The service life of the grid is increased, and higher safety can be achieved.

[0125] 4. Emergency operation is fast, flexible and convenient. The electric actuator of this device drives the safety net installed with it to "fall down" or "erect up". When the driven safety net runs to the position required by the control, the drive device stops the output of the driving torque, and its built-in self-locking device locks the safety net in the position state required by the control system. The electric actuator can mainly convert electrical energy into the rotational motion of the output shaft, thereby realizing the system control of the falling and erecting action of the safety net. The one-button operation is free to retract and accurately position. Compared with general safety nets, it is more convenient and safer, and can be manually retracted and released with a wrench.

[0126] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0127] Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model is also intended to include these modifications and variations.

Claims

1. An electric safety net, characterized in that: include: A first base fixed to the ground, wherein a positioning hole is provided on the first base; The transmission short shaft of the electric actuator is sleeved in the positioning hole; A safety net frame, wherein the safety net frame is made of carbon fiber, the bottom of the safety net frame is fixedly connected to a transmission short shaft, and the transmission short shaft of the electric actuator drives the safety net frame to be laid down or erected; A flange is arranged on the safety net frame, and a frame mounting hole is arranged on the flange. Metal mesh wires are passed through the frame mounting holes to form a safety net.

2. The electric safety net according to claim 1, characterized in that: The electric actuator comprises: a motor, a gear box and a transmission stub shaft, wherein: The second rotating shaft of the motor is connected to the actuator limiting hole on the gear box; A first rotating shaft and an intersecting shaft gear are arranged in the gear box, and the actuator limiting hole is arranged on the gear box, wherein one end of the first rotating shaft is connected to the actuator limiting hole, and the other end of the first rotating shaft is connected to one end of the intersecting shaft gear; A transmission short shaft, the other end of the intersecting shaft gear is connected to the transmission short shaft, and the transmission short shaft is penetrated into the positioning hole of the first base.

3. The electric safety net according to claim 2, characterized in that: Each set of safety net frame includes: Six transverse carbon fiber tubes with flanges and four longitudinal carbon fiber tubes with flanges are assembled by gluing eight metal joints to form three connected rectangular frames. A grid mounting hole is provided on the flange of each carbon fiber tube. A metal bushing is provided on the grid mounting hole to protect the grid mounting hole. A metal wire is passed through the metal bushing to form a safety net. The bottoms of the three connected rectangular frames form four intersection angles of transverse and longitudinal carbon fiber tubes, and a connecting plate is connected to the lower part of each intersection angle, wherein the connecting plate of one of the middle intersection angles is connected to the first base; and the connecting plates of the remaining three intersection angles are respectively connected to a second base.

4. The electric safety net according to claim 3, characterized in that: The first base comprises: Two first ear plates are arranged at intervals, and the parts of the two first ear plates near the upper left corners are connected into one piece through the first connecting part, and the bottom of each first ear plate is connected and fixed to the ground; positioning holes are respectively arranged at the upper right corners of the two first ear plates arranged at intervals, and the transmission short shaft of the electric actuator is sleeved in the positioning holes; A second ear plate, which is arranged between the gaps of the two first ear plates and sleeved on the transmission short shaft. The second ear plate is fixedly connected to the transmission short shaft by a first bolt to realize the laying down or erecting of the second ear plate; the top of the second ear plate is connected to a connecting plate at one of the middle intersection angles by a second bolt. When the second ear plate is laid down or erected, the safety net frame is driven to be laid down or erected.

5. The electric safety net according to claim 4, characterized in that: A first fine-tuning hole is provided on the first connecting portion, a first fine-tuning bolt is provided in the first fine-tuning hole, the first fine-tuning bolt abuts against the bottom of the second ear plate, and the tilting angle of the second ear plate is fine-tuned by tightening or loosening the first fine-tuning bolt.

6. The electric safety net according to claim 3, characterized in that: Each second base, comprising: Two third ear plates are arranged relatively spaced apart, and the tops of the two third ear plates are connected into one piece through a third connecting portion; the third connecting portion is connected to one of the connecting plates of the remaining three intersection angles through a fourth bolt; A fourth ear plate, the bottom of which is connected to the ground by a fifth bolt; the fourth ear plate is arranged between the gaps of the two third ear plates, and the fourth ear plate is connected to the two third ear plates by a rotating shaft, so as to realize the linkage operation of laying down or erecting the two third ear plates together with the first base; an arc-shaped limiting groove is also arranged on the fourth ear plate, and a roller is also connected between the two third ear plates, and the roller slides in the arc-shaped limiting groove to limit the laying down or erecting position of the safety net frame.

7. The electric safety net according to claim 6, characterized in that: A second fine-tuning hole is provided on the fourth ear plate at a position aligned with the top end of the arc-shaped limiting groove, a second fine-tuning bolt is provided in the second fine-tuning hole, the second fine-tuning bolt abuts against the side wall of the roller in the arc-shaped limiting groove, and the tilting angle of the fourth ear plate is fine-tuned by tightening or loosening the fine-tuning bolt; A third fine-tuning hole is provided on the fourth ear plate at a position aligned with the bottom end of the arc-shaped limiting groove, and a third fine-tuning bolt is provided in the third fine-tuning hole. The third fine-tuning bolt is pressed against the side wall of the roller in the arc-shaped limiting groove, and the vertical angle of the fourth ear plate is fine-tuned by tightening or loosening the fine-tuning bolt.

8. The electric safety net according to claim 6, characterized in that: The fourth ear plate is also provided with a base limiting block, and the side wall of the fallen safety net frame abuts against the base limiting block to prevent the safety net frame from falling excessively.

9. The electric safety net according to claim 6, characterized in that: The motor is also connected to a manual mechanism, which is connected to a hand-cranked latch, so that the manual mechanism and the transmission short shaft are driven in sequence through the hand-cranked latch, thereby driving the safety net frame to be laid down or erected; It also includes a locking pin, and the third ear plate and the fourth ear plate are respectively provided with locking holes, and the locking pin passes through the first third ear plate, the fourth ear plate and the second third ear plate in sequence to lock the fourth ear plate in an upright or laid down state.

10. The electric safety net according to claim 1, characterized in that: Also includes: The control circuit connected to the electric actuator includes: The live wire and neutral wire of the external power supply AC220 are connected to the terminal block in the electric control box, the live wire and neutral wire of the terminal block are connected to the filter, the neutral wire and live wire of the filter are connected to the ninth live wire switch and the eighth neutral wire switch of the power switch SW, the eighth neutral wire switch and the ninth live wire switch of the power switch SW are respectively connected to the eleventh live wire switch and the tenth neutral wire switch of the circuit breaker in the electric control box; the power indicator light is respectively connected to the two contacts of the circuit breaker; One end of the two contacts of the first contactor and the second contactor is connected to the motor of the electric actuator, and the other end is connected to the eleventh live wire switch; the third end of the motor is connected to the neutral wire; The first fuse is connected in series with the tenth neutral line switch; the second fuse is connected in series with the eleventh neutral line switch; A first fuse and a second fuse are connected in series on one side of the step-down rectifier circuit, and a third fuse and a third fuse capacitor are connected in series on the other side of the step-down rectifier circuit; The third fuse and the third fusing capacitor are connected to the touch screen respectively; The touch screen is connected to the communication interface of the PLC via a communication line; The power supplies L and N of the PLC are connected to the first fuse and the second fuse respectively; The first output terminal of the PLC is connected to the first contactor; The second output terminal of the PLC is connected to the second contactor; The third output terminal of the PLC is connected to a buzzer; The common terminal of the PLC is connected to the first fuse; The first input terminal of the PLC is connected to the seventh terminal of the terminal row; The second input terminal of the PLC is connected to the eighth terminal of the terminal row; The signal feedback device of the motor is connected to the seventh terminal and the eighth terminal of the terminal row through a cable; The third input terminal and the fourth input terminal of the PLC are connected to the erection and reclining knobs on the door panel of the control box; the common end of the erection and reclining knobs is connected to the 24V port of the PLC.

Images