62results about How to "Improve vibration damping effect" patented technology

The present application relates to the technical field of milling cutter, in particular to a variable helix angle vibration reduction type milling cutter assembly, which comprises a connecting disc, a vibration reduction assembly, a milling cutter, a sliding frame, a sleeve rod, a second spring and a damping block, the variable helix angle arranged on the milling cutter can effectively reduce the vibration when the milling cutter is subjected to high-frequency vibration, so as to avoid affecting the normal work of the milling cutter, when the milling cutter is subjected to low-frequency vibration, the damping block will slide upward under the force brought by the vibration, so as to extrude the second spring, and also push the sliding shaft of the sleeve rod to start to contract, the second spring will generate elastic force after being compressed, so as to drive the damping block and the sliding shaft of the sleeve rod to reset, when the damping block is bounced back, the force brought by the vibration will be offset, and when the sliding shaft of the sleeve rod slides in the sleeve rod, there is friction, so the force brought by the vibration can also be consumed, so that the effect of effectively reducing the vibration is achieved, and the low-frequency vibration and the high-frequency vibration can be effectively reduced.

The application provides a bearing assembly for chemical mechanical polishing, comprising a damping module, a driving module and a bearing head; wherein the damping module comprises a spindle with a cavity inside and a first damping unit in the cavity, the first damping unit comprises a core and a plurality of damping blocks arranged on the outer wall of the core, the damping blocks extrude the inner wall of the cavity to absorb the transverse vibration of the spindle. The core is placed in the spindle, which enhances the damping and anti-vibration effect, in addition, the plurality of damping blocks arranged on the outer wall of the core can absorb the transverse excitation generated from the polishing head grinding, the compression resistance of the damping blocks is fully utilized, the original shearing and tensile working state is changed to a compression working state, the transverse damping capacity is increased, and the reset and limiting effects are also exerted.

The invention discloses a drum washing machine. The drum washing machine of the present invention comprises: a housing in which an outer drum is arranged; the front shock absorber is arranged between the shell and the outer cylinder and is close to the front end of the outer cylinder; the rear shock absorber is arranged between the shell and the outer cylinder and is close to the rear end of the outer cylinder; the ratio of the distance between the front shock absorber and the front end of the outer cylinder to the total length of the outer cylinder is 0.12-0.17; and / or the ratio of the distance between the rear shock absorber and the rear end of the outer cylinder to the total length of the outer cylinder is 0.15-0.22. According to the drum washing machine, the mounting positions between the front shock absorber and / or the rear shock absorber and the outer drum of the washing machine are reasonably designed, so that the front shock absorber and the rear shock absorber play the best effect, and the overall shock absorption effect of the washing machine is improved.

The application provides a bearing seat, an electric spindle assembly and a numerical control machine tool. The bearing seat comprises an outer seat body, an inner seat body, a damping structure and a cooling channel. The outer seat body forms an outer chamber, and the inner seat body is arranged in the outer chamber. A damping cavity is formed between the inner seat body and the outer seat body, and the damping structure is arranged in the damping cavity. The cooling channel is formed in the outer seat body, the inner seat body or the damping structure. The cooling effect and the damping effect are considered, the damping structure improves the support damping between the inner seat body and the outer seat body, and the vibration between the inner seat body and the outer seat body can be absorbed. The cooling liquid is introduced into the cooling channel, the heat generated by the high-speed rotation of the bearing can be taken away, the thermal deformation of the bearing and the bearing seat is prevented, the rotation accuracy of the electric spindle and the stability of the electric spindle operation are improved. The damping structure is formed by injecting a hot-melt glue type material into the damping cavity and solidifying, and the pressure of the damping cavity is not adjustable. The damping structure is formed by injecting metal powder, silicon oil or hydraulic oil into the damping cavity, and the pressure of the damping cavity is adjustable.

The utility model relates to the technical field of automobile vibration reduction, in particular to a vibration reduction support special for an automobile steering wheel, which comprises a main support frame, a first damping assembly, an elastic connecting plate, a hydraulic buffer unit, an adjusting arm and a dynamic balance module. The main supporting frame is connected with a steering column through bolts, and a flexible sleeve is arranged on the inner side to absorb vibration. A ball bearing is embedded in the elastic connecting plate to reduce friction; the hydraulic buffer unit adjusts the damping force by utilizing the flow characteristic of silicone oil; the position of the adjusting arm is adjusted through a gear rack mechanism; the dynamic balance module disperses high-frequency vibration through cooperation of a spring piece and a rubber cushion layer. Omnibearing vibration under complex road conditions can be effectively restrained, the installation process is simplified, adaptability and durability are improved, and the requirements of modern automobiles for high comfort and intelligent monitoring are met.

The utility model relates to a damping device for a fan outlet pipeline. The damping device for the fan outlet pipeline comprises an objective table internally provided with a through groove and further comprises a first mounting block arranged in the through groove, a first clamping plate is hinged to the upper end of the first mounting block, and a first spring damper is arranged between the first clamping plate and the first mounting block; the second mounting block is arranged in the through groove and located on one side of the first mounting block, a second clamping plate is hinged to the upper end of the second mounting block, and a second spring shock absorber is arranged between the second clamping plate and the second mounting block. The objective table, the first clamping plate and the second clamping plate are arranged to support, clamp and fix the outlet pipeline, so that the vibration amplitude of the outlet pipeline is reduced, and the situation that other devices are interlocked and shut down due to excessive vibration of the outlet pipeline is avoided; the first spring shock absorbers and the second spring shock absorbers can absorb vibration when the fan outlet pipeline vibrates, and the vibration reduction effect is further improved.

This invention discloses a variable damping tuned mass damper and its construction method, comprising a top plate, a bottom plate, a mass block, several elastic elements, a guide assembly, an eddy current damper assembly, and a position adjustment assembly. The top plate and bottom plate are arranged opposite to each other, and the mass block is fixedly mounted on the bottom plate. Connecting parts are provided around the mass block. The several elastic elements are arranged between the bottom plate and the connecting parts. The guide assembly passes through the elastic elements, with one end fixedly connected to the bottom plate and the other end movably passing through the connecting parts and fixedly connected to the top plate. The eddy current damper assembly includes a permanent magnet, a conductor plate, and a support. The permanent magnet is fixedly mounted in the middle of the side wall of the mass block. The conductor plate is arranged opposite to the permanent magnet and connected to the position adjustment assembly through the support. The position adjustment assembly allows the conductor plate to move relative to the permanent magnet to adjust the damping magnitude. Through field testing and reasonable damping design, the vibration reduction effect of the damper is greatly improved.

This invention discloses a vibration damping device and its parameter optimization method for suppressing the vibration of ultra-long cable-stayed bridges. The vibration damping device includes a first damper and a second damper disposed between the cable-stayed bridge and the bridge deck. The intersection of the cable-stayed bridge and the bridge deck is the anchorage end. The distance between the installation point of the first damper and the anchorage end of the cable-stayed bridge is a1, and the distance between the installation point of the second damper and the anchorage end of the cable-stayed bridge is a2, where a1 < a2. The dimensionless damping coefficient of the first damper is η1, where η1 = c1 / (Tm). 0.5 The dimensionless damping coefficient of the second damper is η2, where η2 = c2 / (Tm). 0.5 The value of η1 ranges from η1,opt3 to η1,opt1, and η2 ≈ 1. In the damping device of this invention, the first damper is mainly for low-order modal vibration, and the second damper is mainly for high-order modal vibration, so that each damper can play its best role. This allows the damping device to effectively suppress different modal vibrations of the cable-stayed bridge, avoid excessive or insufficient control of the cable vibration, and improve the structural safety and comfort of the bridge.

This utility model discloses a differential mounting structure, belonging to the field of automotive technology. It solves the problem of poor vibration damping performance of existing differentials. It mainly includes a subframe and a differential. The subframe includes a front crossbeam and a rear crossbeam. Front mounts are installed on the left and right sides of the bottom of the front crossbeam. The front mount includes a front inner liner tube and a front bolt. The top of the front inner liner tube is connected to an upper cover plate, and a lower cover plate is provided on the lower side of the front inner liner tube. A rubber pad is installed on the upper side of the lower cover plate. The front inner liner tube is also fitted with a front rubber sleeve. The front bolt is threaded to the front crossbeam. Lugs are connected to the left and right sides of the front end of the differential. A fixing cylinder is provided at the front end of the lugs, and the rubber sleeves on both sides are respectively installed into the corresponding fixing cylinders on both sides. Rear mounting holes are opened on the left and right sides of the front end face of the rear crossbeam. A rear mount is installed in the rear mounting holes. The rear mount includes a rear inner liner tube, and a rear rubber sleeve is fitted into the rear inner liner tube. The rear inner liner tube is fixedly installed at the rear end of the differential.

The application discloses a parallel hole damping-spiral tube inerter underwater damping device and belongs to the technical field of underwater vibration control. The device comprises an upper shell, a lower shell, a damping spring, an open small hole damping and an open fluid inerter. The upper shell and the lower shell are two parts in relative sliding. The damping spring and the open small hole damping are assembled in parallel to form an integral body, which together constitutes an open spring damping. The open spring damping and the open fluid inerter are connected in parallel, and the upper and lower ends of the two are respectively fixed to the upper shell and the lower shell. The open small hole damping and the open fluid inerter are both installed in the upper shell and the lower shell. The application adopts a parallel topology structure of inerter, damping and spring. The double spiral pipes and the symmetrical piston rods realize the fluid inerter effect in two directions. The small holes on the damping piston realize the speed-dependent throttling damping. The device has the characteristics of wide frequency vibration isolation, strong static load capacity, symmetrical positive and negative characteristics and deep water environment.

The utility model relates to rubber support technical field, concretely is a three -dimensional anisotropic shock attenuation rubber support, the utility model discloses a main body function layer and external protection layer, the external protection layer is covered in the outside of main body function layer, the main body function layer includes at least two corrugated stiffened sheets, and the rubber layer is arranged between two adjacent corrugated stiffened sheets, and the rubber layer and corrugated stiffened sheet staggered overlap, and the rubber layer is bonded together vulcanization between stiffened sheets, the external protection layer includes upper rubber protection layer, side rubber protection layer and lower rubber protection layer, and the periphery of rubber layer and corrugated stiffened sheet all and side rubber protection layer bond or vulcanization into a whole, the corrugated configuration form of support corrugated stiffened sheet that the utility model puts forward can make when support shearing deformation, and the effective shearing layer thickness of different directions can carry out different design, and the vertical deformation mode of support has changed, realizes longitudinal, lateral differentiating rigidity, yield force design, and realizes the vertical shock attenuation design.

The utility model discloses a grooving cutter with a vibration reduction cutter bar, and relates to the technical field of grooving cutters. The tool bar comprises a tool bar sleeve, one side of the tool bar sleeve is fixedly connected with an end head, and one side of the end head is provided with a tool; a vibration reduction assembly is arranged in an inner cavity of the cutter bar sleeve and comprises a damper fixedly connected to the inner cavity of the cutter bar sleeve. Through the design of the vibration reduction assembly, the vibration resistance of the grooving cutter is effectively improved, the service life of the grooving cutter is effectively prolonged, cutting vibration energy can be efficiently absorbed through the combination of the damper and the vibration reduction plate, vibration is converted into multi-directional movement through the sliding rod, the sliding sleeve and the connecting rod mechanism, and intelligent rigidity adjustment of the memory alloy tension spring is matched. Compared with a traditional vibration reduction material, the mechanical vibration reduction structure has the advantages that the problem of consumable abrasion is solved, excellent vibration reduction performance can still be maintained after long-term use, the roughness of a machined surface can be effectively reduced, and the service life of a cutter can be prolonged.

The utility model provides a kind of damping mechanism for ball mill, comprising: base, below the barrel of corresponding ball mill;Several damping components are located on the base, each the damping component includes upper and lower sequentially connected roller, upper and lower telescopic damping spring, upper and lower telescopic air bag, several air bags are respectively connected exhaust device and inflator, the roller is arranged on the barrel outer wall, several damping springs and several air bags are equipped with follow-up plate, the follow-up plate side is equipped with trigger, the base is equipped with several pressure boost trigger devices below the follow-up plate and corresponding several triggers, the pressure boost trigger device is used to trigger the inflator and corresponding air bag inflation;The damping strength of several damping components can be adjusted to increase with the increase of vibration intensity of different parts of barrel, to improve the overall damping effect of damping mechanism.

The utility model relates to a damping device technical field discloses a damping suspension base, including base body, be provided with the cavity in the base body, the cavity is equipped with first rubber damping layer and sound absorption cotton layer from top to bottom in succession in it. The utility model discloses a cavity is set up in the base body, and the sound absorption cotton is filled in the cavity to form the sound absorption cotton layer, compared to the sound absorption cotton is set up around the base body, when the sound absorption cotton is filled in the cavity of the base body, the sound absorption cotton can not be influenced by the dust of outside, humid air, makes sound absorption cotton can keep excellent sound absorption performance for a long time. And through the first rubber damping layer that sets up the sound absorption cotton layer in the cavity top, through the first rubber layer can absorb the vibration that produces when air conditioning compressor works, again cooperates sound absorption cotton layer to absorb the noise that penetrates into the base body downwards and blocks the noise and penetrates out suspension base, to make the damping effect of damping suspension base get greater promotion.

The utility model relates to a glass lifter bracket belongs to the steam picture glass lifter part. The slider and the base body are integrally injection molded once, the buffer pad and the base body are integrally injection molded twice, and the base body has directional limit in the horizontal direction of bearing glass. The advantages are novel structure, integral injection molding of the bracket base body and the slider, cancellation of the slider assembly process, cost reduction and benefit increase, secondary injection molding of the bracket base body and the buffer pad, no gap between the bracket base body and the buffer pad after long-term use, no abnormal sound, B-shaped hollow structure of the buffer pad, improved damping effect, long service life, the novel bracket limits the glass displacement in the horizontal direction, the glass does not deflect when rising, the glass has good sealing property after rising into the groove, and the phenomenon of rain leakage due to the non-strict sealing line of the glass rising top is eliminated.

The application provides an underground tunnel crack repairing intelligent drilling device, a mechanical arm and a method, relates to the field of underground intelligent repairing equipment, and aims to solve the problems of low intelligence degree and easy damage of a detection assembly caused by drilling impact during drilling of a crack in an underground project. A matched detection assembly is arranged on a drilling assembly, crack state parameters can be collected during drilling, and auxiliary positioning can be performed. The detection assembly is installed on a support plate through a sliding pair with a resilient piece. When vibration occurs during construction, part of the vibration can be absorbed by the resilient piece. The direction of action of the resilient piece is consistent with the drilling direction, so that the impact effect generated during drilling is improved, and the detection equipment is protected.

The utility model relates to the technical field of machining equipment, in particular to a numerical control machining center stand column and base installation structure which comprises a stand column body and a base body. The top face of the base body protrudes to form two installation parts distributed at intervals, the top faces of the installation parts are sunken to form limiting grooves and vibration reduction grooves, the bottom face of the stand column body is provided with butt joint parts corresponding to the installation parts, the butt joint parts make contact with the installation parts, the bottom faces of the butt joint parts protrude to form limiting blocks matched with the limiting grooves, and the limiting blocks are embedded in the limiting grooves. A locking screw rod is arranged on the butt joint part, penetrates through the butt joint part and the limiting part and is in threaded connection with the mounting part, a vibration reduction spring is arranged in the vibration reduction groove, one end of the vibration reduction spring abuts against the bottom of the vibration reduction groove, the other end of the vibration reduction spring abuts against the butt joint part, and through embedded matching of the limiting block and the limiting groove, accurate alignment is achieved; limiting and fixing of the front side and the rear side of the stand column can be added, and firmness of the stand column after installation is ensured.

The utility model provides a baffle asymmetric particle damper which comprises a vibration reduction box and a plurality of baffles, and the vibration reduction box is provided with a vibration reduction cavity used for containing particles. The baffles are rotationally connected into the vibration reduction cavity through the rotating shaft, a main shaft of the rotating shaft extends horizontally, the baffles are arranged in a matrix mode, the surfaces of the baffles extend in the radial direction of the rotating shaft, and each baffle comprises an upper swing part located above the rotating shaft and a lower swing part located below the rotating shaft. The radial extension width of the lower swing part along the rotating shaft is greater than that of the upper swing part along the rotating shaft; when the vibration reduction box is in a vibration state, the baffle can swing and collide with particles to dissipate energy. According to the particle damper with the asymmetric baffles, the baffles and particles can repeatedly act under the low excitation amplitude, the energy dissipation capacity is enhanced, and the vibration reduction performance is improved.

The utility model relates to a high pressure resistant type deep sea hydrophone, and relates to the field of hydrophones, the high pressure resistant type deep sea hydrophone comprises a housing used for accommodating a hydrophone body, the top of the housing is provided with a top cover, a vibration damping assembly is arranged between the housing and the hydrophone body, and the top cover is provided with a through hole for a cable of the hydrophone body to pass through. The hydrophone has the advantages that the stability and reliability of the hydrophone body during deep sea operation are improved, and the service life is prolonged.

The utility model relates to the technical field of noise reduction devices, in particular to a noise reduction device for bearing machining, which comprises a noise reduction pad and anti-skid particles, the anti-skid particles are fixedly connected to the lower side of the noise reduction pad, a vibration and noise reduction mechanism is arranged on the inner side of the noise reduction pad, the vibration and noise reduction mechanism comprises a fixed cylinder, and the inner side of the fixed cylinder is tightly attached to a rubber ring sleeve. A movable bearing table is slidably connected to the inner side of the rubber ring sleeve, a piston sleeve sleeves the outer side of the movable bearing table, the lower side of the piston sleeve is tightly attached to the upper end of the noise reduction spring, a connecting through hole is formed in the inner side of the side edge of the lower end of the fixing cylinder, and a damping vibration attenuation assembly is fixedly connected to the outer side of the fixing cylinder and comprises a communicating pipe; according to the multi-layer structure design and the hydraulic damping principle, effective buffering of mechanical vibration and remarkable reduction of noise are achieved, and the vibration reduction and noise reduction performance and stability of the device are further enhanced through structural optimization and detailed design of each further-implemented scheme.

The utility model discloses a variable damping force shock absorber, and belongs to the technical field of shock absorbers. According to the variable damping force shock absorber, the piston body is provided with the inner cavity, the first damping valve, the second damping valve and the electromagnetic valve are all arranged in the inner cavity, the structure is simple, assembly is facilitated, and the size of the shock absorber is reduced. The flow and the flow speed of fluid entering the electromagnetic valve can be controlled by adjusting the opening degree of the electromagnetic valve, so that the flow and the flow speed of the fluid introduced into the first branch cavity are adjustable, and then the damping force provided by the first damping valve is controlled. Meanwhile, the damping force provided by the first damping valve can be adjusted by replacing the first damping valve elements of different models. The damping force provided by the second damping valve can be adjusted by replacing the second damping valve elements of different models, and then the damping effect of the variable damping force shock absorber is improved.

This invention discloses a force-guided vibration damping structure, which solves the problems of poor force-guiding performance, low assembly precision, and insufficient vibration damping efficiency in existing vibration damping structures. The force-guided vibration damping structure includes an upper plate, a lower plate, and a force-guiding elastic unit connecting the upper and lower plates. The two ends of the force-guiding elastic unit are fixedly connected to the upper and lower plates, respectively. Both the upper and lower plates are flat plates arranged parallel to each other. The axis of the force-guiding elastic unit has an angle of inclination with respect to the z-direction. The force-guided vibration damping structure proposed in this invention can accurately guide and efficiently dampen z-direction loads, while reducing assembly errors, and is suitable for z-direction vibration damping requirements in various scenarios such as precision equipment and aerospace.

The utility model provides a kind of energy accumulator damping structure, it is related to energy storage equipment technical field, including: tank, the one side of tank is provided with base, the one side of base is provided with fixed mechanism.The utility model, by setting fixed mechanism, fixed block inserts inside fixed seat, and it is fixed to fixed block by pushing fixed plate to insert inside fixed seat, and rotating bottom block drives threaded rod to rotate, and sleeve frame gradually moves and drives clamping block to move, and clamping block inserts inside fixed plate and limits its position, and fixed plate is stably fixed to fixed block, i.e., tank and base are fixed between, and tank and base have good stable fixing measure between, avoid unexpected separation phenomenon between tank and base, reduce the probability that tank appears unexpected damage, improve the stability of tank and base between fixed, improve the damping effect of tank on base.

This invention relates to a leaf spring elastic support for a balance suspension, comprising an upper mounting base and a lower mounting base, which are longitudinally fitted together. A spring mounting position is provided circumferentially on the upper mounting base, with the spring portion mounted vertically within the mounting position. The upper mounting base is fixed to a pre-tightened frame via an intermediate connecting part to provide vertical vibration damping. The vertical mounting of the spring portion, combined with the special structures of the upper and lower mounting bases, such as conical mounting surfaces and cylindrical support structures, effectively resists horizontal forces and tensile forces, preventing performance degradation or failure of the support under complex stress environments. Simultaneously, this design enhances the structural strength of the support and extends its service life.

This utility model relates to the field of air compressor technology, specifically to a multi-stage vibration damping structure, an air compressor, and a rail vehicle. The multi-stage vibration damping structure includes: a first vibration damping pad located below the system hanger, the first vibration damping pad comprising a first vibration damping pad body, the inner and outer walls of which are integrally formed with metal inserts and connecting sleeves, respectively; a second vibration damping pad, at least a portion of which is located above the system hanger; and a mounting bolt, which passes sequentially from top to bottom through the second vibration damping pad, the system hanger, the metal insert, and the washer before being threadedly connected to a mounting nut located below the washer. This utility model, by setting the first vibration damping pad, allows the vibration of the air compressor to be damped by the first vibration damping pad before being transmitted to the system hanger; by setting the second vibration damping pad, a portion of the vibration of the system hanger is absorbed by the second vibration damping pad, thereby achieving two-stage vibration damping and improving the vibration damping effect.

This invention discloses a double-layer clamp for aircraft piping with nonlinear vibration reduction function. The device includes an inner clamp, an outer clamp, clamp gaskets, fastening bolts, and fastening nuts. A certain constraint gap exists between the inner and outer clamps. Both the inner and outer clamps are assembled to the aircraft body using fastening bolts and nuts. The inner clamp consists of an inner clamp metal band and an inner clamp bushing; the outer clamp also consists of an outer clamp metal band and an outer clamp bushing. Both the inner and outer clamp bushings are made of nitrile rubber-organic small molecule hybrid composite material, exhibiting excellent damping performance. This invention utilizes the outer clamp to provide nonlinear constraint stiffness and nonlinear constraint damping to achieve nonlinear vibration reduction, enabling wide-frequency vibration reduction and effectively improving the vibration reduction performance of traditional single-layer clamps. This device is easy to manufacture and install, employs a nonlinear passive vibration control strategy, and achieves high efficiency at low cost.

The utility model proposes a kind of marine equipment vibration reduction noise damper, it is related to ship vibration reduction noise technical field, including upper connecting plate, the lower side of upper connecting plate is equipped with lower connecting plate, the upper surface of lower connecting plate is equipped with two groups first installation hole.The utility model is through high damping rubber material upper damping layer, metal rubber composite material middle damping layer and viscoelastic damping material lower damping layer, and with the cooperation of vibration reduction spring, can constitute multistage damping vibration reduction system, can be optimized respectively to different frequency vibration, increase overall damping effect, and through the cooperation of porous sound-absorbing board and soundproof board, can effectively absorb medium-high frequency noise, and break the noise outward radiation, increase the overall noise reduction effect of this damper, to reduce the vibration and noise generated by surface mechanical equipment of ship, and through anticorrosive coating can increase the weather resistance of this damper, facilitate the effective vibration reduction noise use of marine equipment.

This invention provides a fully submersible vibration-damping system that uses vibration energy to drive seawater reaction force, comprising: a support frame, a flow guide, and a seawater reaction force turbine and an electromagnetic damper placed within the flow guide. The electromagnetic damper is connected to the seawater reaction force turbine, and the support frame and the flow guide are connected to the seawater reaction force turbine. The flow guide and the seawater reaction force turbine are mounted on the outside of the columns of the floating platform to be vibration-damped via the support frame. The flow guide restricts the direction of seawater flow, and the seawater reaction force turbine provides a counterforce based on the inflowing seawater to prevent the flow guide from sinking or floating. The electromagnetic damper provides rotational damping for the seawater reaction force turbine. This invention solves the problems of poor vibration reduction effect and high cost of existing floating wind turbines.

The application discloses a landing shock-absorbing frame, which comprises a landing shock-absorbing frame assembly, shock-absorbing containing boxes, a driving mechanism and a central control system. The landing shock-absorbing frame assembly is used for providing supporting force for shock-absorbing and buffering during landing and comprises symmetrically arranged supporting cross bars and supporting inclined vertical rods respectively installed on top surfaces of the supporting cross bars. The bottom of each shock-absorbing containing box is in the shape of an open port and is fixed to the bottom surface of each supporting cross bar. One of the shock-absorbing containing boxes is provided with a shock-absorbing air bag wound up, and the free end of the shock-absorbing air bag is connected with a pull rope which extends into the other shock-absorbing containing box. The driving mechanism is arranged in the two shock-absorbing containing boxes and is used for expanding and unfolding and winding up the shock-absorbing air bag. The central control system comprises a PLC module, a landing environment monitoring module and a landing communication module. The application can adapt to various complex landing scenes and improve the shock-absorbing effect.

This utility model relates to a roof-spanning, compression-free Z-shaped purlin device, comprising a main purlin, a support assembly, and connecting nodes. The support assembly, with its segmented design, distributes the roof load and is positioned below the main purlin. The main purlin's web has an elongated hole. The support assembly is fixed to the main purlin via connecting nodes, which include a positioning pin and an anti-torsion groove. The positioning pin is inserted into the elongated hole on the main purlin's web and engages with the anti-torsion groove to limit and prevent torsion of the main purlin. This device achieves compression-free, high-precision purlin installation, improving construction efficiency and structural safety.