Grid is optimized and is used workstation with prevent that equipment from connecting to fall off
Technical Field
The invention relates to the technical field of network optimization equipment, in particular to a workbench for grid optimization, which can prevent equipment connection from being disconnected.
Background
The network optimization means that the network performance reaches the optimal balance point required by people through various hardware or software technologies, so that a user can more smoothly talk and surf the internet by using equipment such as a mobile phone, a tablet and the like, and the problems of talk and surf the internet are avoided.
The most important in network optimization is grid optimization, so that internet surfing and communication can be normally performed on all roads in an urban area, and user perception of a user is improved, when grid optimization is performed, an optimizer usually sits on a vehicle, places a computer on legs, then connects a test device with the computer through a connecting line, finally the vehicle starts, the network optimizer sits on the vehicle and tests around the roads in the urban area, but because a workbench suitable for fixing the computer and the test device is not available, the computer is placed on the legs during testing, the test device is placed on the computer, the vehicle can shake in the running process, so that the computer and the device shake, a connected line is easy to drop, if the connection between the device and the computer is disconnected, the vehicle needs to be driven to return to an original point for retesting once again, a great deal of time and energy are wasted, and the work efficiency of network optimization personnel is affected.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the grid optimization workbench capable of preventing equipment connection from being disconnected, and solves the problems that the connection line between equipment and a computer is easy to be disconnected and the working efficiency of network optimization personnel is influenced.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a workbench for grid optimization and capable of preventing equipment connection from being disconnected comprises an oval protection box, wherein two first fixing plates are fixedly connected to the bottom of the inner wall of the oval protection box, first fixing sleeves are movably sleeved on the outer portions of the two first fixing plates, the outer portions of the two first fixing sleeves are fixedly connected through an oval plate, an air bag is arranged on the oval protection sleeve and is located at the bottom of the oval plate, two limiting devices are fixedly connected to the top of the oval plate, the positions of the two limiting devices correspond to the positions of the two first fixing plates, a clamping groove is formed in one side, close to the limiting devices, of the two first fixing plates, a fixing groove is formed in the top of the oval plate, two fixing devices are fixedly connected to the top of the oval plate and are symmetrically distributed on two sides of the fixing groove, one side of the oval protection box is fixedly connected with a telescopic device.
Preferably, two stop device includes the fixed cover of two seconds, two first fly leaf has been cup jointed in the equal activity in inside of the fixed cover of second, the one end fixedly connected with compression spring of first fixed plate is kept away from to first fly leaf, compression spring keeps away from the one end fixedly connected with second fixed plate of first fly leaf, the one end of first fixed plate is kept away from at the fixed cover of second to second fixed plate fixed connection, first fly leaf is close to compression spring's one end fixedly connected with movable rod, the one end that first fly leaf was kept away from to the movable rod runs through the inner chamber of second fixed plate and extends to the outside of second fixed plate, the one end fixedly connected with ring handle of first fly leaf is kept away from to the movable rod, the ring handle is located the outside of second fixed plate.
Preferably, the two fixing devices comprise two first supporting rods, the two first supporting rods are fixedly connected to the top of the elliptical plate, the top of the two first supporting rods is fixedly connected with a third fixing sleeve, a second movable plate is movably sleeved inside the two third fixing sleeves, one ends of the two second movable plates, which correspond to the first movable plates, are fixedly connected with a first air pipe, a first piston is movably sleeved inside the first air pipe, the top of the first air pipe is fixedly connected with a first sealing plate, the bottom of the first sealing plate is fixedly connected with an elastic pull rope, the bottom of the elastic pull rope is fixedly connected to the top of the first piston, a first air pipe is fixedly connected to a vent of the first sealing plate, one end of the first air pipe, which is far away from the first sealing plate, penetrates through the inner cavity of the elliptical plate and extends to the bottom of the elliptical plate, one end, far away from the first sealing plate, of the first gas conveying pipe is fixedly connected to the gas outlet of the air bag, and the bottom of the first piston is fixedly connected with a buffering device.
Preferably, buffer includes the second trachea, second trachea fixed connection is in the bottom of first piston, the second piston has been cup jointed in the tracheal inside activity of second, the bottom fixedly connected with head rod of second piston, the bottom fixedly connected with first connecting plate of head rod, the bottom fixedly connected with thickening rubber pad of first connecting plate, the vent department fixed connection elasticity rubber sheet of second trachea one side.
Preferably, the telescopic device comprises a third air pipe fixedly connected to one side of the elliptical protective sleeve, the bottom of the third air pipe is fixedly connected with a second sealing plate, a third piston is movably sleeved in the third air pipe, the top of the third piston is fixedly connected with a second connecting rod, the outer part of the second connecting rod is fixedly sleeved with a circular plate, the bottom of the circular plate is fixedly connected with two elastic ropes, the bottoms of the two elastic ropes are both fixedly connected with the top of the third air pipe, a second gas pipe is fixedly connected at the gas inlet of the second sealing plate, one end of the second gas pipe, which is far away from the second sealing plate, penetrates through and extends to the inner cavity of the oval protective box, one end, far away from the second sealing plate, of the second gas pipe is fixedly connected to the gas outlet of the air bag, and the top of the second connecting rod is fixedly connected with a clamping device.
Preferably, the clamping device comprises a third fixing plate, the third fixing plate is fixedly connected to the top of the second connecting rod, the top of the third fixing plate is fixedly connected with a second connecting plate, the top of the second connecting plate is fixedly connected with a supporting plate, the inner cavity of the supporting plate is fixedly connected with a nut, a threaded rod is sleeved on the inner thread of the nut, the top of the threaded rod is fixedly connected with a rotating rod, the bottom of the threaded rod is fixedly connected with a bearing seat, and the bottom of the bearing seat is fixedly connected with a clamping plate.
Preferably, the size of the fixing groove in the top of the elliptical plate is equal to that of the inch computer, and the depth of the fixing groove is centimeter.
Preferably, the size of the elliptic plate is matched with that of the elliptic protection box.
(III) advantageous effects
The invention provides a grid optimization workbench capable of preventing equipment connection from being disconnected, which has the following beneficial effects:
(1) this have and prevent that equipment connection from falling off line's for net optimization workstation, place back in the fixed slot at oval shaped plate top when the computer, push down oval shaped plate, the compression gasbag to make fixing device can fix the computer.
(2) The grid optimization workbench with the function of preventing the equipment connection from being disconnected has the advantages that the buffer device can reduce the pressure of the fixing device on the computer, the phenomenon that the fixing device applies too much pressure to the thickened computer is avoided, and the computer is prevented from being damaged.
(3) This grid with prevent that equipment connection from falling off line optimizes and uses workstation utilizes the position to oval plate that stop device can be very convenient to fix, sets up the ring handle among the stop device and makes people more comfortable convenient when exerting force.
(4) This have and prevent that equipment connection from falling off line grid optimizes and uses workstation is injectd the removal of elliptical plate through first fixed plate and first fixed cover, guarantees that elliptical plate can not rock and slope at the in-process that removes.
(5) This have and prevent that equipment connection from falling off line's workstation for grid optimization, the telescoping device that sets up can highly adjust clamping device, when inapplicable, can reduce its space that occupies, makes its space utilization reach the maximize, and can improve the distance between test equipment and the notebook computer when using, reduces the influence that the notebook computer produced test equipment, improves the test equipment and looks sideways at the accuracy of in-process.
(6) The workbench for grid optimization with the function of preventing the equipment connection from being disconnected has the advantages that the clamping device can be used for conveniently fixing the test equipment, so that the test equipment and a computer are fixed on the consent platform, and the connected circuit is prevented from falling off.
(7) This have and prevent that equipment connection from falling off line's workstation for grid optimization through elasticity stay cord and stretch cord, can accomplish the reseing to first piston and third piston to when not using, gaseous inside that can get back to the gasbag again, and elasticity stay cord and stretch cord can also carry on spacingly to first piston and third piston, guarantee that first piston and second piston move about all the time and are located first trachea and the tracheal inside of third.
(8) This have and prevent that equipment connection from falling off the line grid optimizes and uses workstation, utilize fixed cover of third and second fly leaf can be very convenient completion computer get put, make people get when putting the computer quicker.
(9) The grid optimization workbench capable of preventing the equipment connection from being disconnected utilizes the fixing groove and the positioning device to fix the computer more firmly, and ensures that the computer cannot move.
(10) This have and prevent that equipment connection from falling off line's workstation for grid optimization, after oval shaped plate moves down, the baffle has been added in the outside at oval shaped plate in other words to oval guard box, consequently optimizes the personnel and can place article such as cell-phone at the top of oval shaped plate at the in-process of test, guarantees that article such as cell-phone can not lose.
(11) This have and prevent that equipment connection from falling off line's workstation for grid optimization sets up oval guard box and oval shaped plate and can protect optimization personnel not to be hurt, and oval more makes things convenient for optimization personnel to place it on the leg.
(12) This have and prevent that equipment connection from falling off line's workstation for grid optimization through bearing frame fixed connection clamp plate, can make the clamp plate need not pivoted downstream to when avoiding pressing from both sides tightly, the clamp plate causes wearing and tearing to test equipment, improves test equipment's life.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a side cross-sectional structural schematic view of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 2B according to the present invention;
FIG. 5 is a schematic front view of the buffering device shown in FIG. 4 according to the present invention;
FIG. 6 is a schematic front view of the telescopic device shown in FIG. 2 according to the present invention;
fig. 7 is a front view of the clamping device of fig. 6 according to the present invention.
In the figure: 1 oval protective box, 2 first fixing plate, 3 first fixing sleeve, 4 oval plate, 5 air bag, 6 limiting device, 601 second fixing sleeve, 602 first movable plate, 603 compression spring, 604 second fixing plate, 605 movable rod, 606 circular handle, 7 clamping groove, 8 fixing groove, 9 fixing device, 901 first supporting rod, 902 third fixing sleeve, 903 second movable plate, 904 first air pipe, 905 first piston, 906 first sealing plate, 907 first air pipe, 908 elastic pull rope, 10 expansion device, 1001 third air pipe, 1002 second sealing plate, 1003 third piston, 1004 second connecting rod, 1005 circular plate, 1006 elastic rope 1104, 1007 second air pipe, 11 buffer device, 1101 second air pipe, 1102 second piston, 1103 first connecting rod, 1105 first connecting plate, 1105 thickening rubber pad, 1106 elastic rubber sheet, 12 clamping device, 1201 third fixing plate, 1202 second connecting plate, 201 elastic rubber sheet, 601 second fixing sleeve, 602 first movable plate, 603 compression spring, 604 second fixing plate, 605 movable rod, 606 circular handle, 606 circular ring handle, 7 clamping device, 8 fixing, 1203 support plate, 1204 nut, 1205 threaded rod, 1206 turn bar, 1207 bearing block, 1208 clamp plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a technical solution: a grid optimization workbench capable of preventing equipment connection from being disconnected comprises an oval protection box 1, two first fixing plates 2 are fixedly connected to the bottom of the inner wall of the oval protection box 1, first fixing sleeves 3 are movably sleeved on the outer portions of the two first fixing plates 2, movement of an oval plate 4 is limited through the first fixing plates 2 and the first fixing sleeves 3, the oval plate 4 is guaranteed not to shake or tilt in the moving process, the outer portions of the two first fixing sleeves 3 are fixedly connected through the oval plate 4, due to the fact that the oval shape does not have sharp corners, optimization personnel are not prone to being injured, the oval protection box 1 and the oval plate 4 can protect the optimization personnel from being injured, the oval shape is more convenient for the optimization personnel to place on legs, the size of the oval plate 4 is matched with the size of the oval protection box 1, and therefore when the oval plate 4 moves downwards, the air bag 5 can be comprehensively compressed, after the elliptical plate 4 moves downwards, the elliptical protection box 1 is equivalent to adding a baffle plate on the outer side of the elliptical plate 4, so that an optimizer can place articles such as a mobile phone on the top of the elliptical plate 4 in the testing process to ensure that the articles such as the mobile phone cannot be lost, the elliptical protection sleeve 1 is provided with the air bag 5, the air bag 5 is positioned at the bottom of the elliptical plate 4, the top of the elliptical plate 4 is fixedly connected with two limiting devices 6, the positions of the two limiting devices 6 correspond to the positions of the two first fixing plates 2, the two limiting devices 6 comprise two second fixing sleeves 601, the first movable plates 602 are movably sleeved in the two second fixing sleeves 601, the positions of the first movable plates 602 can be limited by the second fixing sleeves 601, the first movable plates 602 and the clamping grooves 7 are used for fixing the positions of the elliptical plate 4, a compression spring 603 is fixedly connected to an end of the first movable plate 602 away from the first fixed plate 2, a second fixed plate 604 is fixedly connected to an end of the compression spring 603 away from the first movable plate 602, such that the first movable plate 602 is conveniently reset, and the position of the elliptical plate 4 is conveniently limited, the second fixed plate 604 is fixedly connected to an end of the second fixing sleeve 601 away from the first fixed plate 2, a movable rod 605 is fixedly connected to an end of the first movable plate 602 close to the compression spring 603, an end of the movable rod 605 away from the first movable plate 602 penetrates through an inner cavity of the second fixed plate 604 and extends to the outer side of the second fixed plate 604, an annular handle 606 is fixedly connected to an end of the movable rod 605 away from the first movable plate 602, the annular handle 606 is located at the outer side of the second fixed plate 604, such that the position of the elliptical plate 4 can be conveniently fixed, and the position of the elliptical plate 4 can be conveniently fixed by using the, the ring handle 606 is arranged in the limiting device 6, so that people feel more comfortable and convenient when applying force, one side of the two first fixing plates 2, which is close to the limiting device 6, is provided with a clamping groove 7, the top of the elliptical plate 4 is provided with a fixing groove 8, the size of the fixing groove 8 at the top of the elliptical plate 4 is equal to that of a 14-inch computer, the depth of the fixing groove 8 is 2 cm, the 14-inch computer is most commonly used in network optimization, because the weight and the area of the 14-inch computer are more suitable for optimizing long-time testing of personnel, and the distance between the bottom of the computer and the heat dissipation hole is approximately 2-3 cm, so that the heat dissipation hole cannot be blocked, the heat dissipation hole can be guaranteed to normally dissipate heat, the fixing groove 8 can reach the premise of fixing the computer, the heat dissipation efficiency of the notebook computer is guaranteed not to be influenced, and the, two fixing devices 9 are symmetrically distributed on two sides of the fixing groove 8, each fixing device 9 comprises two first supporting rods 901, each first supporting rod 901 is fixedly connected to the top of the elliptical plate 4, each top of each first supporting rod 901 is fixedly connected with a third fixing sleeve 902, each inside of each third fixing sleeve 902 is movably sleeved with a second movable plate 903, and one corresponding end of each second movable plate 903 is fixedly connected with a first air pipe 904, so that the two second movable plates 903 can be pulled towards the direction far away from the fixing groove 8, a notebook computer is placed inside the fixing groove 8, the two second movable plates 903 are moved towards the direction close to the fixing groove 8, the two first air pipes 904 are respectively positioned on two sides of the top of the notebook computer, and the two sides of the top of the normal 14-inch notebook computer are provided with vacant positions to facilitate people to take, therefore, the keyboard of the notebook computer cannot be pressed in the fixing process, the taking and placing of the computer can be conveniently completed by utilizing the third fixed sleeve 902 and the second movable plate 903, so that people can take and place the computer more quickly, the first piston 905 is movably sleeved in the first air pipe 904, the top of the first air pipe 904 is fixedly connected with the first sealing plate 906, the bottom of the first sealing plate 906 is fixedly connected with the elastic pull rope 908, the bottom of the elastic pull rope 908 is fixedly connected with the top of the first piston 905, the elastic pull rope 908 can reset the first piston 905, the vent of the first sealing plate 906 is fixedly connected with the first air pipe 907, one end of the first air pipe 907 far away from the first sealing plate 906 penetrates through the inner cavity of the elliptical plate 4 and extends to the bottom of the elliptical plate 4, one end of the first air pipe 907 far away from the first sealing plate 906 is fixedly connected at the air outlet of the air bag 5, through the air pressure principle, after the air flow enters the inside of the first air pipe 904, the first piston 905 is pushed to move, or when the first piston 905 moves, the air inside the first air pipe 904 flows, therefore, when the elliptical plate 4 moves downwards, the air bag 5 is squeezed, the air inside the air bag 5 flows into the inside of the first air pipe 904, the first piston 905 is pushed to move downwards, the buffer device 11 is pushed downwards to fix the notebook computer, when no force is applied to the elliptical plate 4, the elastic force of the elastic pull rope 908 is utilized to make the first piston 905 move upwards, so that the air inside the first air pipe 904 is squeezed into the inside of the air bag 5, the air bag 5 is filled with air, the elliptical plate 4 moves upwards, the computer is more firmly fixed by the fixing groove 8 and the positioning device 9, and the computer is ensured not to move, when a computer is placed in a fixing groove 8 at the top of an elliptical plate 4, the elliptical plate 4 is pressed downwards, an air bag 5 is compressed, so that a fixing device 9 can fix the computer, a buffer device 11 is fixedly connected to the bottom of a first piston 905, the buffer device 11 comprises a second air pipe 1101, the second air pipe 1101 is fixedly connected to the bottom of the first piston 905, a second piston 1102 is movably sleeved in the second air pipe 1101, a first connecting rod 1103 is fixedly connected to the bottom of the second piston 1102, a first connecting plate 1104 is fixedly connected to the bottom of the first connecting rod 1103, a thickened rubber pad 1105 is fixedly connected to the bottom of the first connecting plate 1104, an elastic rubber sheet 1106 is fixedly connected to a vent on one side of the second air pipe 1101, when the thickened rubber pad 1105 in the buffer device 11 is in contact with the notebook computer, due to the action of force, the thickened rubber pad 1105 applies the same force to the notebook computer as the force applied by the thickened rubber pad 1105, the thickened rubber pad 1105 is stressed to push the second piston 1102 upwards, the second piston 1102 can extrude the gas in the second air pipe 1101, so that the elastic rubber sheet 1106 is deformed, after the second piston 1106 is deformed, the air pressure in the second air pipe 1101 is reduced, the force applied to the second piston 1102 is reduced, the force applied to the thickened rubber pad 1105 is reduced, so that the extrusion force applied to the notebook computer is reduced, the service life of the notebook computer is prolonged, the buffer device 11 can reduce the pressure applied to the computer by the fixing device 9, the excessive pressure applied to the thickened computer by the fixing device 9 is avoided, the computer is prevented from being damaged, the expansion device 10 is fixedly connected to one side of the oval protection case 1, the expansion device 10 comprises a third air pipe 1001, the third air pipe 1001 is fixedly connected to one side of the oval protection case 1, the bottom of the third air pipe 1001 is fixedly connected with a second sealing plate 1002, a third piston 1003 is movably sleeved inside the third air pipe 1001, a second connecting rod 1004 is fixedly connected to the top of the third piston 1003, a circular plate 1005 is fixedly sleeved outside the second connecting rod 1004, two elastic ropes 1006 are fixedly connected to the bottom of the circular plate 1005, the bottoms of the two elastic ropes 1006 are fixedly connected to the top of the third air pipe 1001, and the first piston 905 and the third piston 1003 can be reset through an elastic pull rope 908 and the elastic ropes 1006, so that when the air bag is not used, the air can return to the inside of the air bag 5 again, the elastic pull rope 908 and the elastic ropes 1006 can limit the first piston 905 and the third piston 1003 to ensure that the first piston 905 and the third piston are always movably positioned inside the first air pipe 1003 and the third air pipe 1001, a second air delivery pipe 1007 is fixedly connected to an air inlet of the second sealing plate 1002, one end of the second air delivery pipe 1007 far away from the second sealing plate 1002 penetrates through and extends to an inner cavity of the elliptic protection box 1, one end of the second air pipe 1007 far away from the second sealing plate 1002 is fixedly connected to the air outlet of the air bag 5, and by the air pressure principle, when the air flow enters the third air pipe 1001, the third piston 1003 is pushed to move, or the third piston 1003 moves, the air in the third air pipe 1001 flows, therefore, when the elliptical plate 4 moves downwards, the air bag 5 is squeezed, the air in the air bag 5 flows into the third air pipe 1001, the third piston 1003 is pushed to move upwards, when no force is applied to the elliptical plate 4, the third piston 1003 moves downwards by using the elasticity of the elastic cord 1006, so that the air in the third air pipe 1001 is squeezed into the air bag 5, the air bag 5 is filled with air, the elliptical plate 4 moves upwards, and the height of the clamping device 12 can be adjusted by the provided telescopic device 10, when the testing device is not used, the occupied space can be reduced, the space utilization rate of the testing device is maximized, the distance between the testing device and a notebook computer can be increased when the testing device is used, the influence of the notebook computer on the testing device is reduced, the accuracy of the testing device in the side view process is improved, the top of the second connecting rod 1004 is fixedly connected with a clamping device 12, the clamping device 12 comprises a third fixing plate 1201, the third fixing plate 1201 is fixedly connected with the top of the second connecting rod 1004, the top of the third fixing plate 1201 is fixedly connected with a second connecting plate 1202, the top of the second connecting plate 1202 is fixedly connected with a supporting plate 1203, the inner cavity of the supporting plate 1203 is fixedly connected with a nut 1204, the inner thread of the nut 1204 is sleeved with a threaded rod 1205, the top of the threaded rod 1205 is fixedly connected with a rotating rod 1206, the bottom of the threaded rod 1205 is fixedly connected with a bearing seat, the testing equipment is placed on a third fixing plate 1201 in a clamping device 12, then a threaded rod 1205 is rotated, the threaded rod 1205 drives a clamping plate 1208 to move downwards to clamp the testing equipment, the clamping plate 1208 is fixedly connected through a bearing seat 1207, the threaded rod 1205 needs to rotate in the process of moving downwards, but the bearing seat 1207 is utilized, the clamping plate 1208 does not need to rotate in the process of descending, the clamping plate 1208 does not need to move downwards in a rotating manner, so that the clamping plate 1208 is prevented from wearing the testing equipment, the service life of the testing equipment is prolonged, the clamping device 12 can conveniently fix the testing equipment, the testing equipment and a computer are fixed on the same platform, the testing equipment and the notebook computer cannot move relative to each other, the notebook computer and the testing equipment are guaranteed to shake simultaneously, and therefore, a circuit cannot shake relative to the notebook computer and the testing equipment, the connection line can be ensured not to fall off from the test equipment or the notebook computer, and the connection line can be ensured not to fall off, so that the connection of the equipment can be ensured not to fall off.
The working principle is as follows: the computer is placed in the fixing groove 8 at the top of the elliptical plate 4, the second movable plate 903 in the fixing device 9 is moved to enable the first air pipe 904 in the fixing device 9 to be located at the side of the top of the notebook computer, then the circular handle 606 arranged on the limiting device 6 is pulled to enable the circular handle 606 to drive the movable rod 605 and the first movable plate 602 to move towards the middle part, so that the first movable plate 602 is separated from the clamping groove 7, the elliptical plate 4 can move downwards, the first fixing plate 2 and the first fixing sleeve 3 can limit the direction of the elliptical plate 4 moving downwards, the elliptical plate 4 cannot incline in the process of moving downwards, then the elliptical plate 4 can squeeze the air bag 5 when moving downwards to enable the air bag 5 to contract, when the air bag 5 contracts, air in the air bag 5 can enter the first air pipe 904 and the third air pipe 1001 through the first air pipe 907 and the second air pipe 1007 respectively, so that the first piston 905 moves downwards and the third piston 1003 moves upwards, the first piston 905 drives the buffer device 11 to move downwards, thereby fixing the notebook computer, the buffer device 11 can reduce the pressure on the notebook computer through the air in the second air pipe 1101 and the elastic rubber sheet 1106, and avoid the computer damage, the upward movement of the third piston 1003 can drive the clamping device 12 to move upwards, so that an optimizer can conveniently fix the testing equipment on the clamping device 12, the testing personnel places the equipment on the top of the third fixing plate 1201, then screws the threaded rod 1205, and drives the clamping plate 1208 to move downwards to complete the fixing of the testing equipment, after the elliptical plate 4 moves downwards for a certain distance, the position of the first movable plate 602 in the limiting device 6 corresponds to the position of the clamping groove 7 at the bottom of the first fixing plate 2, and the elliptical plate 4 is fixed through the limiting device 6, at this time, the gas flowing out of the airbag 5 moves the first piston 905 to the bottom and the third piston 1003 to the top, and the elastic cord 908 and the elastic cord 1006 are in the maximum state of elongation.