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47results about How to "Good elastic support" patented technology

Platform for supporting conveyor belt of treadmill

A platform for supporting a conveyor belt of a treadmill includes a wooden plate, a reinforcement plate above the wooden plate, and a shock-absorbing plate sandwiched between the wooden plate and the reinforcement plate. The shock-absorbing plate has a surface facing the wooden plate base, and a plurality of cushions protruding from the surface and stopping against the wooden plate for providing good elastic support force and cushion effect.
Owner:HEALTHSTREAM TAIWAN INC

Method for manufacturing composite shoe insole

InactiveUS20070126146A1Light weightSoft elastic featureDischarging arrangementSolesLiquid stateEngineering
A method for manufacturing a composite shoe insole includes a) placing EVA material having at least one bonding zone into a die, b) applying a PU film around a peripheral wall of the bonding zone of the EVA material, c) heating the EVA material, d) placing PU material at a liquid state into the bonding zone, e) solidifying the PU material so that the PU material is combined with the bonding zone to form a shoe insole, and f) stripping the shoe insole from the die to remove the shoe insole. Thus, the composite shoe insole closely combine the EVA material with the PU material, so that the composite shoe insole has a lighter weight by the EVA material and has a soft elastic feature by the PU material.
Owner:YANG KUO NAN

Novel belt spring support debris flow protective wall and construction method thereof

The invention discloses a novel belt spring support debris flow protective wall and a construction method thereof. The debris flow protective wall comprises a front gravity retaining wall, a rear gravity retaining wall, a belt spring support and waterproof cover plates. The belt spring support comprises an inner pipe structure. The inner pipe structure is composed of first inner pipes and second inner pipes, and the first inner pipes and the second inner pipes are of different sizes and are connected in a staggered and nested mode. The outer side of the inner pipe structure is sleeved with outer casing pipes and springs which are arranged in a staggered mode. The two ends of each spring are fixed to the two adjacent outer casing pipes correspondingly. The space between the front gravity retaining wall and the rear gravity retaining wall is filled with gravel filler. The upper portion and the two sides of the whole protective wall are covered with the waterproof cover plates. Compared with a traditional support, the novel support composed of the inner pipes, the springs and the outer casing pipes can guarantee stability more easily when bearing impact loads. Compared with a traditional gravity retaining wall, the debris flow protective wall of the design can block debris flow more effectively, less power impact is borne by the protective wall through the flexible structure, andreliable stability is achieved.
Owner:ZHEJIANG UNIV

Bulb structure and steering system of steering pull rod

The invention discloses a bulb structure and steering system of a steering pull rod. The bulb structure comprises a bulb pin (1), a joint part (4), a base (5) and an elastic supporting base (6), wherein the a limit accommodating cavity for accommodating a bulb is arranged in the joint part, and a pin rod stretches out towards one side of the joint part from the bulb; the base is mounted on the bottom wall of the other side opposite to the side from which the pin rod stretches out, of the joint part; the elastic supporting base is positioned in the limit accommodating cavity and mounted on the base so as to support the bulb, the elastic supporting base is an integrated annular elastic piece, and the annular elastic piece comprises an inner ring part (61) and outer ring parts (62), wherein the bottom end of the inner ring part and the bottom ends of the outer ring parts are respectively arranged on the base in a supporting manner, the bottom end of the bulb is inserted in the inner ring part and is elastically propped against the inner wall of the inner ring part. The bulb structure disclosed by the invention has the advantages that the components are few, the assembled structure is simple, the elastic supporting base and the base are unlikely to deform and lose efficacy, and the large-scale manufacturing, maintenance and replacement are convenient to perform.
Owner:BEIQI FOTON MOTOR CO LTD

Buried compression-resistant cable

The invention discloses a buried type compression-resistant cable. The cable comprises a cable outer protective layer, wherein an installation cavity is formed in the cable outer protection layer, anelastic supporting cage is mounted in the mounting cavity, the elastic supporting cage extends along the length direction of the cable outer protection layer, a gap cavity is formed between an outer wall surface of the elastic supporting cage and an inner wall surface of the installation cavity, more than one cable core wire is arranged in the gap cavity, an elastic supporting part elastically extends out of the elastic supporting cage, and the elastic supporting part extends out of one end of the elastic supporting cage to form an arc-shaped wrapping part. The cable is advantaged in that theelastic supporting cage is arranged in the cable, when in use at ordinary times, the elastic buffer capability is very good, the cable core wire can be pressed into a receding protection cavity afterbeing subjected to large shearing pressure, secondary protection is conducted through the elastic supporting cage, moreover, the elastic supporting part can wrap the cable core wire after the cable core wire retracts into the receding protection cavity, the strength is further improved, and overall safety of the cable is improved.
Owner:人民电缆集团有限公司

Adjustable supporting seat for remote monitoring and alarming temperature controller

The invention relates to the technical field of supporting seats, in particular to an adjustable supporting seat for a remote monitoring and alarming temperature controller. The adjustable supportingseat comprises a base, wherein a controller is arranged above the base; side plates are vertically arranged on the two sides of the top surface of the base; limiting mechanisms are arranged on the inner side surfaces of the two side plates; a supporting plate which is horizontally placed is arranged above the base; the supporting plate is located under the controller; the supporting plate is connected with the base through a plurality of vertical springs which are arranged at intervals; the two ends of the supporting plate are each connected with a horizontally-arranged connecting plate; and installing holes are formed in the middle parts of the two side plates. The adjustable supporting seat for the remote monitoring and alarming temperature controller has the advantages of being simple in structure and convenient to use, the position height of the supporting plate can be adjusted conveniently according to the use situation, thus the position of the controller can be adjusted when thecontroller is used, and the controller is convenient to adjust and use in various situations.
Owner:HUANGSHI XIANDA ELECTRIC CO LTD

Cantilever structure elastic foil dynamic pressure air floatation thrust bearing

The invention relates to a cantilever structure elastic foil dynamic pressure air floatation thrust bearing comprising a thrust bearing seat and a plurality of cantilever structure elastic foils installed on the thrust bearing seat. Each cantilever structure elastic foil comprises a top foil part, a bending part and a bottom foil part which are connected in sequence, and each bottom foil part is provided with a plurality of elastic units with the same height. The plurality of cantilever structure elastic foils are sequentially connected end to end, and the top foil part of each previous cantilever structure elastic foil is lapped on the elastic units of the bottom foil part of the corresponding next adjacent cantilever structure elastic foil. The air floatation thrust bearing comprises an elastic supporting unit in a bump foil bearing, has the advantages of a simple structure of a cantilever bearing, can adapt to different loads and use environments, and can meet the use requirements of high operation stability and large-scale engineering application.
Owner:CHINA ELECTRONICS TECH GROUP CORP NO 16 INST

Heat dissipation device of new energy automobile battery and heat dissipation method thereof

The invention discloses a heat dissipation device of a new energy automobile battery and a heat dissipation method thereof. The heat dissipation device comprises a bottom plate, wherein a fixing mechanism is arranged on the upper surface of the bottom plate, a shell mechanism is arranged at the top end of a fixing frame, water cooling mechanisms are arranged on one side and an inner cavity of the shell mechanism, protection mechanisms are arranged on the two sides of a battery cell body, a positioning mechanism is arranged at the bottom part of the battery cell body, a plurality of air cooling mechanisms are arranged in an inner cavity of the fixing frame, fixing plates are arranged on the two sides of each air cooling mechanism, and three fixing bolts are arranged on the two sides of the upper surface of the bottom plate. According to the invention, the arrangement mode that the water cooling mechanism and the air cooling mechanism are matched with each other is utilized, so that cold water in the cooling pipe flows downwards and circulates among the battery cell bodies to facilitate heat dissipation of the automobile battery, and air is blown upwards to the battery cell bodies through fan blades to enable hot air to be dissipated upwards from a heat dissipation net; and the water cooling mechanism and the air cooling mechanism can be conveniently matched for heat dissipation in severe weather, so that the heat dissipation efficiency of the battery is higher.
Owner:刘晓文

Buffer type safe anti-collision street lamp

The invention belongs to the field of street lamps, the invention relates to a buffer-type safe anti-collision street lamp. The street lamp comprises a rod body and a protective shell, an annular damping plate is fixedly mounted at the upper end of the protective shell, the lower end of the rod body penetrates through the annular damping plate and extends into the protective shell, the side wallsof the two sides of the rod body are movably connected with the inner side wall of the protective shell through two pressing plates, the rod body and the protective shell are fixed through a pressurespring, a damping box is slidably connected to the inner bottom face of the protective shell, a lifting plate is slidably connected to the inner side wall of the damping box in a sealed mode, a vent hole is formed in the lifting plate, a flow limiting valve is arranged in the vent hole, the lower end of the rod body is fixedly connected with the lifting plate, and the lifting plate is fixedly connected with the inner bottom face of the damping box through a supporting spring. When a vehicle collides with the rod body, a good damping effect is achieved, the possibility that the rod body is bentdue to vehicle collision is greatly reduced, and further deterioration of traffic accidents is avoided.
Owner:杨李强

Bridge pier VSR (vibration stress relief) method for steel structural bridge

ActiveCN108130414AVibration aging treatment time is smallNo damage to surface qualityStress reliefMultiple resonance
The invention discloses a bridge pier VSR (vibration stress relief) method for a steel structural bridge and relates to the technical field of stress relief treatment of steel structure parts. A bridge pier of the steel structural bridge is a high-rigidity and heavy large structural part, and stress relief treatment is difficult to perform with existing thermal stress relief, natural stress relief, ultrasonic impact stress relief and VSR methods. According to the method, the bridge pier is supported by a support pad, multiple sets of VSR equipment are used, multiple vibration exciters are adjacently fixed on a lower frame beam of the bridge pier, multiple vibration testers are adjacently fixed on an upper frame beam of the bridge pier, then, multiple vibration exciters are controlled by use of multiple controllers, co-frequency sub-resonance vibration is performed on multiple resonance peaks of the bridge pier for several hours, the purpose of effectively relieving the residual stressis achieved, the average relief rate of the residual stress reaches 43%, the problem of difficulty in relieving the residual stress of the bridge pier is solved, and the method can be applied to steelstructural bridges.
Owner:NANNING SHENHUA VSR TECH RES INST +1

Air yarn covering machine

The invention provides an air yarn covering machine, and belongs to the technical field of air yarn covering machines. The machine solves the problem that in the prior art, the discharging efficiencyis poor. The air yarn covering machine comprises a machine frame, a first discharging mechanism is arranged at the left side above the front face of the machine frame, the first discharging mechanismcomprises a first transmission shaft, a first motor, first supporting rods and first sleeve plates, the first motor is installed at the shaft end below the first transmission shaft, the first supporting rods are evenly arranged at the periphery of the first transmission shaft, the first sleeve plates are fixedly arranged at the inner walls of the first supporting rods, frosted cushion layers are evenly arranged at the peripheries of the first sleeve plates, vent holes annularly and evenly run through the first transmission shaft and the first sleeve plates, and an arc groove is formed in the inner side face of the first discharging mechanism. The air yarn covering machine has the advantage of improving the discharging quality.
Owner:浙江宇昌纺织科技有限公司

Elastic ball stabilizer

The invention provides an elastic ball centralizer, which is mainly used to ensure the centering degree of the casing, reduce the running friction resistance of the casing, and improve the running smoothness of the casing. The fixing ribs are spirally arranged on the outer wall of the centralizer body to facilitate the rotation of the casing downhole. The centralizer includes a fixed rib, a centralizer body, leaf springs and balls. A leaf spring with multiple middle holes is arranged inside each fixed rib near the outer wall of the centralizer body to provide support for each ball. Each ball corresponds to a center hole. The hole surface of each middle hole is ground into a concave spherical surface consistent with the ball. The elastic coefficient of the leaf spring is set according to the different inclination angles to give the casing the best elastic support.
Owner:SOUTHWEST PETROLEUM UNIV

Novel music box structure

InactiveCN109346038AChange the shading areaChange spreadAutomatic musical instrumentsEngineeringUltimate tensile strength
The invention discloses a novel music box structure. The novel music box structure comprises an articulating box, supporting plates are installed on the two sides of the lower end face of the articulating box, a rotating hole is formed in the articulating box, a rotating rod is rotationally installed in the rotating hole, a rotating plate is installed on the upper end face of the rotating rod, anda connecting rod is installed on the rotating rod. The rotating plate is rotated, and drives circular cover plates to rotate, the shielding area of the circular cover plates for sound discharging holes is changed accordingly, and the sound of a music box is conveniently changed; bent-angle rods support the middle sides of the front ends and the back ends of articulating plates, and the anti-bending-deformation strength of the middles of the articulating plates can be effectively improved; when the articulating plates are shifted and bent through articulating protrusions, the articulating plates can be rapidly sprung back to the original state, and the articulating plates are not prone to bending and deformation under using for a long time; pulling plates are pulled on the inner sides to drive inserting rods to be separated from inserting grooves, the pulling plates are pulled downwards, a fixing plate is separated from a square hole, new articulating plates and fixing plates are inserted into the lower port of the square hole, and the articulating plates are conveniently replaced.
Owner:QUANNAN LIXIN TECH CO LTD

Wind power generation equipment

The invention provides wind power generation equipment, and belongs to the technical field of wind power generation. The wind power generation equipment comprises a base and an adjusting assembly. The base comprises a box body and a case body, the top of the case body is open, the two sides of the case body are open, the box body is arranged in the case body, a sleeve pipe is arranged at the top of the box body, and the bottom of the sleeve pipe is closed. The adjusting assembly comprises a telescopic part, a first rod body, a rotating part, a swing part and a wind power generation device body. The wind power generation device body is rotationally connected with the swing part, the wind power generation device body is rotationally connected with the rotating part through the swing part, the rotating angle of the wind power generation device body is conveniently adjusted by driving the swing part, the wind power generation device body is convenient to adjust and use according to wind direction changes, the applicability of the device is conveniently improved, and the power generation efficiency of the power generation equipment is improved.
Owner:韦章松

Buried pressure-resistant cable

The invention discloses a buried pressure-resistant cable, which comprises a cable outer protective layer, an installation cavity is formed in the cable outer protective layer, an elastic support cage is installed in the installation cavity, and the elastic support cage extends along the length direction of the cable outer protective layer , a gap cavity is formed between the outer wall of the elastic support cage and the inner wall of the installation cavity, and more than one cable core wire is arranged in the gap cavity, and an elastic support part is elastically stretched out of the elastic support cage, and the elastic support part protrudes from the elastic One end of the support cage forms an arc wrapping portion. The present invention has an elastic support cage inside the cable, which has a very good elastic cushioning capacity in normal use, and can press the cable core wire into the concession protection cavity after receiving a large shear pressure, and use the elastic support cage to carry out A secondary protection, at the same time, the elastic support part can wrap the cable core wire outside the cable core wire after the cable core wire is retracted into the retreat protection cavity, further improving the strength and increasing the overall safety of the cable.
Owner:人民电缆集团有限公司

Fixing protection device for lithium battery

The invention relates to the technical field of lithium batteries, in particular to a fixing protection device for a lithium battery. The device comprises fixing frames and a fixing base, and the fixing frames are fixedly installed on the outer side of the top of the fixing base in the circumferential direction. A transverse telescopic fixing assembly is fixedly installed on each fixing frame, a supporting sleeve is fixedly installed at the end of the transverse telescopic fixing assembly, an L-shaped fixing plate is arranged on the supporting sleeve in a matched and sliding mode, and the lower end of the L-shaped fixing plate is connected with a vertical telescopic fixing assembly installed on the fixing base through an elastic strip. A pressurizer used for controlling the multiple transverse telescopic fixing assemblies to extend at the same time is further installed on the fixing base, and a negative pressure device used for controlling the multiple vertical telescopic fixing assemblies to shorten at the same time is further installed on the fixing base. The lithium battery fixing device is novel in structure, convenient to fix and operate and good in lithium battery fixing andprotecting effect.
Owner:张 长成

Stably-installed laser player shell

The invention discloses a stably-installed laser player shell, and belongs to the field of laser players. The stably-installed laser player shell comprises a mounting plate and a shell main body, wherein the left side and the right side of the shell main body are each fixedly connected with two connecting blocks, the bottom of the shell main body makes contact with the mounting plate, fixing pins are inserted into the four connecting blocks correspondingly, four abutting blocks are fixedly connected to the middles of the four fixing pins correspondingly, the bottoms of the four connecting blocks make contact with the mounting plate correspondingly, the bottom ends of the four fixing pins penetrate through the four connecting blocks and the mounting plate correspondingly and extend into the mounting plate, and eight first springs are fixedly connected into the mounting plate. According to the invention, a laser player shell can be quickly mounted in a time-saving and labor-saving manner, the mounting effect is guaranteed, it is guaranteed that a player is stably placed while a user can quickly disassemble and assemble the player conveniently, and the player can be replaced and overhauled conveniently.
Owner:深圳冠兰达电子科技有限公司

Sanding component

InactiveCN105382715AFlexibleRich in friction resistanceFlexible-parts wheelsEngineeringMechanical engineering
The invention discloses a sanding component. The sanding component comprises a base body, brush-shaped sisal fibers and pieces of abrasive cloth, wherein the brush-shaped sisal fibers are installed on the working surface of the base body. The pieces of abrasive cloth are arranged transversely relative to the rotating direction of the base body and arranged at intervals in the rotating direction of the base body. At least one row of sisal fibers are arranged on the back side of each piece of abrasive cloth. The sisal fibers are lower than the pieces of abrasive cloth. According to the sanding component, the sisal fibers are arranged on the back sides of the pieces of abrasive cloth, and the pieces of abrasive cloth can be well supported elastically through sisal fiber brushes located on the back sides of the pieces of abrasive cloth, so that the pieces of abrasive cloth are prevented from being bent and kept being in elastic contact with a concave-convex curved surface having a height fall all the time, sanding of most transition corner radians can be completed, and only several dead corners need to be sanded manually.
Owner:FOSHAN JINGYUAN MACHINERY CO LTD

Independent lifting spring pad

An independent lifting spring mattress, comprising a bottom plate (3) and a surface cover (18). The bottom plate (3) is provided with a plurality of lifting assemblies (1) and rail assemblies (2). The rail assembly (2) is disposed between every four adjacent lifting assemblies (1). Each lifting assembly (1) comprises an independent spring (5) connected with the bottom plate (3). A lifting barrel (4) is disposed outside the independent spring (5). Four rail keys (17) are disposed at the lower portion of the outer side of the lifting barrels (4). Each rail assembly (2) comprises an upright rail (14) fixed on the bottom plate (3). Four rail slots (16) are disposed at the outer side of the upright rail (14). A rail cover (15) is fixedly mounted at the top end of the upright rail (14). The rail keys (17) on each lifting barrel (4) are mounted in the rail slots (16) on the adjacent upright rail (14), respectively. Without using sponge, the independent lifting spring mattress can be used only applying a layer of braided fabric surface cover on the surface of the mattress, each independent spring can lift up and down freely, collision and friction among the independent springs are prevented, the best elastic supporting function of each spring is achieved, the problem of the limited function of the springs of the spring mattress is resolved, and the independent lifting spring mattress has a simple structure.
Owner:YANTAI LIMIN MAHOGANY FURNITURE

EPS protection plate used for circuit and with strong hydrophobicity and protective properties

The invention relates to the field of circuit protection technology and discloses an EPS protection plate used for a circuit and with strong hydrophobicity and protective properties. The EPS protection plate comprises a plate body, the upper surface of the plate body is fixedly connected with a hydrophobic cushion, baffles are respectively fixedly connected with the two side surfaces of the hydrophobic cushion, the lower surface of the plate body is fixedly connected with a buffer cushion, the two side surfaces of the plate body are respectively overlapped with a fixed block, the upper surfaceof each fixed block is fixedly connected with a stop block, and a fixed slot is formed inside each fixed block. The EPS protection plate used for the circuit and with strong hydrophobicity and protective properties realizes flexible support effect on a movable plate by virtue of a first spring and a second spring, flexible support effect on the plate body is conveniently realized, damage producedwhen the plate body is impacted is reduced, protective effect on the plate body is guaranteed, some degree of supporting effect on the plate body is conveniently realized by utilizing an arc-shaped rod, and pressure received by the plate body can be conveniently shared, so that the plate body can bear a relatively high pressure, and the protective properties of the plate body on the circuit are guaranteed.
Owner:ANHUI YOURFRIEND PULP MOLDING TECH

Shore-based connector lug for submarine cable

The invention relates to a shore-based connector lug for a submarine cable, wherein the shore-based connector lug comprises a connector shell, a cable floating connecting assembly for movable connecting is arranged in the connector shell, a front waterproof sleeve is arranged at the front end of the connector shell, and a rear waterproof sleeve is arranged at the tail end of the connector shell. The cable floating connecting assembly comprises an inlet wire floating connector and a wiring floating connector. The inlet wire floating connector comprises a floating sleeve A, the floating sleeve Ais slidably connected with the interior of the cylindrical connector shell, a wire inlet hole is formed in the middle of a sliding sleeve A, a wire distribution disc A is arranged at the front end ofthe wire inlet hole, wire pressing structures are arranged on the end face of the front end of the floating sleeve in an annular array mode, and a floating sleeve B is slidably connected with the interior of the cylindrical connector shell. A wire pressing structure is also arranged on the end surface of the rear end of the floating sleeve B; a plurality of wire pressing bolts and wire pressing structures are arranged in wire collecting holes; the floating sleeve A and the floating sleeve B are utilized to realize clamping of the cable, and mutual floating between the floating sleeve A and the floating sleeve B is utilized to compensate slippage and stretching of a cable core.
Owner:JIANGSU YAGUANG METAL PROD

Road engineering settlement surveying device

The invention discloses a road engineering settlement survey device which comprises a bottom plate, the top of the bottom plate is fixedly connected with a mounting seat, the top of the mounting seat is provided with a device body, the bottom of the device body is fixedly connected with a shell, clamping grooves are formed in the two sides of the shell, the top of an inner cavity of the shell is fixedly connected with a supporting column, and the supporting column is fixedly connected with the top of the inner cavity of the shell. The top of an inner cavity of the supporting column is fixedly connected with a first spring. Through cooperative use of the bottom plate, the mounting base, the device body, the shell, the clamping groove, the supporting column, a first spring, a limiting plate, a connecting rod, a movable frame, a supporting rod, a movable plate, a push block, a hand wheel, a rotating disc, a pin shaft, a telescopic rod, a second spring, a movable plate and a limiting block, the problem that most of existing road engineering settlement surveying devices are mounted and fixed through bolts; and the installation method is not only troublesome, but also relatively tedious in later-stage disassembly process, and brings inconvenience to later-stage maintenance work.
Owner:CHINA THIRD METALLURGICAL GRP

Precise automatic cutting equipment

The invention discloses precise automatic cutting equipment, and relates to the technical field of cutting equipment. Comprising a laser cutting device and a mosquito repelling device, supporting plates are fixedly arranged on the two sides of the laser cutting device, the mosquito repelling device is fixedly arranged on the tops of the supporting plates, a first suction pipe is fixedly arranged on one side of the mosquito repelling device, and a fan is fixedly arranged at one end of the first suction pipe; a second suction pipe is fixedly arranged at the bottom of the fan, a lampshade is fixedly arranged at one end of the second suction pipe and is in a cover body shape with the narrow upper portion and the wide lower portion, and a light supplementing lamp is fixedly arranged in the lampshade, is in a circular tube shape and is transversely fixed. By arranging the light supplementing lamp, the first suction pipe, the second suction pipe and the draught fan, the draught fan sucks mosquitoes gathered on the light supplementing lamp into the mosquito repelling device, the situation that the mosquitoes are gathered on the light supplementing lamp and consequently light irradiation is affected is avoided, and the good light supplementing effect of the light supplementing lamp is kept.
Owner:苏州宝玛格精密机械有限公司

A car seat with adjustable ventilation system

The invention discloses an automobile seat with an adjustable venting system, and relates to the technical field of automobile accessories. The automobile seat comprises a cushion framework and a backrest framework, a cushion and a backrest are respectively arranged on the surfaces of the cushion and the backrest, and an angel adjustor is arranged between the cushion framework and the backrest framework; a cushion air conveying pipe penetrates through the bottom of the cushion framework, one end of the cushion air conveying pipe is communicated with a corrugated soft pipe, and one end of the corrugated soft pipe is communicated with a backrest air conveying pipe; air exhausting pipes are arranged on the circumferential surfaces of one section, in the cushion, of the cushion air conveying pipe and one section, in the backrest, of the backrest air conveying pipe and are parallelly arranged in cores of the cushion and the backrest at intervals. According to the automobile seat, the venting system is designed in the cushion and connected with an automobile air conditioner, venting holes are formed in a leather sleeve, cool air or warm air of the automobile air conditioner can be utilized for dissipating heat or keeping warmth for a user, the venting performance is good, and the comfort degree of the seat is greatly improved.
Owner:山东博超电力工程有限公司
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