218results about How to "Smooth motion" patented technology

The application discloses a powder bonding forming device and method for a complex geological model, which comprises a 3D printing control system, a material conveying tank, a powder falling and paving assembly, a forming box, an inkjet printing assembly, a rack, a forming box moving assembly, a longitudinal beam module and a powder cleaning assembly; the material conveying tank is fixed above the powder falling and paving assembly; the powder falling and paving assembly and the inkjet printing assembly are respectively fixed on longitudinal beam sliding rails of the longitudinal beam module through sliding blocks, and the two are separately moved without interfering with each other during printing and forming; the forming box is located directly below a rectangular space surrounded by the longitudinal beam module, and a forming platform is located in the forming box; the forming box moving assembly is arranged at the bottom of the forming box, and the forming box can be moved along a tow chain to realize moving in for printing and moving out for powder cleaning. The powder paving and bonding functions of the equipment are realized through different modules, the printing efficiency is improved, in addition, the forming platform is lifted from the side, the overall height of the equipment is greatly reduced, and stable vertical movement of the equipment is ensured.

The application provides a focusing motor and a camera module. The focusing motor comprises a fixed part, a moving part, a focusing assembly, a magnetic attraction sensing part, a guide part and a position sensor. The fixed part comprises a first support arm and a second support arm connected with each other, and a light passage hole formed between the first support arm and the second support arm. The moving part is arranged in the light passage hole and can move in a preset direction. The magnetic attraction sensing part is arranged in the moving part. The angle between the magnetization direction of the magnetic attraction sensing part and the first direction and the second direction perpendicular to the preset direction is an acute angle. The guide part is arranged on the first support arm and corresponds to the magnetic attraction sensing part. The position sensor is arranged on the second support arm and corresponds to the magnetic attraction sensing part. The position sensor can generate an induction force with the magnetic attraction sensing part, so that the position sensor can sense the moving position of the moving part. The focusing motor can significantly reduce the size of the focusing motor, and can guarantee the guiding stability and the position detection precision required by the automatic focusing function while realizing the miniaturization of the camera module.

This utility model belongs to the technical field of oil drilling and production equipment, specifically relating to a tubing scraping device. The device includes an upper connector and a scraping head, as well as a rotating mechanism connecting the upper connector and the scraping head. The rotating mechanism includes a support sleeve connected to the upper connector and a rotating body with one end anti-detached from the support sleeve and the other end connected to the scraping head. Track grooves are evenly distributed on the outer wall of the rotating body. A guide pin is provided at the end of the support sleeve away from the upper connector. The track grooves and guide pin are slidably engaged to allow the rotating body to rotate and axially displace relative to the support sleeve when the tubing scraping device is lifted or lowered. In use, by lifting or lowering the device, the track grooves of the rotating body slidably engage with the guide pin of the support sleeve. The guide pin slides along the track grooves, forcing the rotating body to rotate and generate axial displacement, thereby driving the scraping head to actively rotate and move axially. Compared with the prior art, which passively drives the scraping head through scraper friction, this effectively improves scraping quality and efficiency.

The application belongs to the field of coating detection, and specifically discloses a detection equipment for coating production, which comprises a sampling mechanism, wherein the sampling mechanism is connected with a base, a stirring tank is installed at the upper end of the base, the stirring tank is communicated with the sampling mechanism, the sampling mechanism comprises a stepping motor, the stepping motor is connected with a glass frame, a spectrometer is installed at one end of the glass frame, the output end of the stepping motor is in transmission connection with a lead screw, the lead screw is in threaded connection with a sliding rod, the sliding rod is in sliding connection with the glass frame at both ends, the sliding rod is connected with three sample cups which are arranged at equal intervals at the top of the sliding rod, and the sliding rod is in contact with a quantitative control mechanism. The stepping motor is used for driving the sliding rod to translate and trigger the quantitative control mechanism, the multi-angle test pieces arranged in an interlaced mode are combined with the spectrometer, the full-process automatic detection from layered sampling, sedimentation observation to coating optical performance analysis is realized, and the problems of sample cross contamination and low detection efficiency in the prior art are solved.

This invention discloses a Z-axis downward pressing guide mechanism for an SMT placement machine, including a mounting base. Placement heads are located on both sides of the front of the mounting base, a drive mechanism is located on the top of the mounting base, a sliding mechanism is provided between the placement heads and the mounting base, and a return mechanism is provided between the two placement heads. This invention uses an extrusion block to press one of the placement heads downwards. The placement head drives a movable rod downwards, and a limiting block and a stop block move with the movable rod. The stop block deforms under the pressure of a compression spring, and the elasticity of the compression spring pushes the stop block and the movable rod upwards. As one end of the extrusion block rotates upwards, its upper surface presses against the limiting block, causing the movable rod to drive the placement head upwards. This ensures stable vertical movement of the placement head, reduces the space occupied by the placement head, and facilitates the placement of SMT electronic components.

The utility model discloses a numerical control hydraulic control module, which relates to the numerical control hydraulic technical field, and comprises a base plate and a first U-shaped plate, the first U-shaped plate is fixedly arranged on the upper surface of the base plate, the top of the first U-shaped plate is fixedly provided with a first hydraulic cylinder, and the tail end of a piston rod of the first hydraulic cylinder extends to the lower part of the first U-shaped plate; a hexagonal hole is formed in the tail end of a piston rod of the first hydraulic cylinder, a hexagonal prism is slidably inserted into the hexagonal hole in a matched mode, a pressing rod is fixedly arranged at the lower end of the hexagonal prism, and the outer wall of the tail end of the piston rod of the hydraulic cylinder is fixedly sleeved with a second U-shaped plate; transmission mechanisms for driving the pressing rods to move relative to piston rods of the first hydraulic cylinders are arranged on the two sides of the second U-shaped plate. The hydraulic mechanism is provided with the auxiliary hydraulic mechanism, the pressing rod of the main hydraulic mechanism can be rapidly displaced, the stroke of the main hydraulic mechanism can be reduced, and the working efficiency is improved.

This utility model discloses a range-adjustable flattening machine in the field of flattening machine technology, including a base plate and a support platform. The support platform is fixedly installed on the upper part of the base plate. Two uprights are installed on both sides of the rear end of the base plate. An adjustable flattening structure is installed on the upper end of the two uprights. The adjustable flattening structure includes a top plate, a hydraulic cylinder, an operating frame, a mounting frame, two guide sleeves, and a flattening assembly. Through four independently set flattening plates and matching adjusting screws and threaded sleeve structures, the lifting height of each flattening plate can be precisely controlled, realizing a custom combination of flattening areas to adapt to workpieces of different sizes, shapes, or unevenness, significantly improving the versatility of the equipment. The flattening assembly adopts a transmission chain of adjusting screws, connecting plates, and flattening plates, combined with the precision guidance of guide rods and guide blocks, to ensure that each flattening plate moves smoothly and without deviation during adjustment and pressing.

The utility model provides special fixed anchor of light buoy relates to fixed anchor field, including fixed establishment, the inner wall sliding joint of fixed establishment has connecting structure, the fixed establishment includes buoy body, the inner wall all is fixedly connected with fixed plate in buoy body, the inner wall all is connected with movable plate in fixed plate, the outer wall all is fixedly connected with the insert block in movable plate, the inner wall all is fixedly connected with the slide rod in fixed plate, the outer wall all is equipped with the compression spring of slide rod, in the utility model, through movable plate, insert block, compression spring, sliding block, first limit rod etc.

The invention relates to plate placing equipment, in particular to automatic plate placing equipment based on part machining. According to the automatic plate placing equipment based on part machining, scratches of the parts in the plate placing process are reduced. Automatic plate placing equipment based on part machining comprises a base, a support, a rotating block, a placing plate, limiting frames, trays, protruding strips and the like, the support is fixedly connected to the upper side of the right portion of the base, the rotating block is rotationally connected to the support, the right side of the placing plate is fixedly connected with the left side of the rotating block, and the limiting frames are fixedly connected to the lower side of the placing plate in a bilateral symmetry mode; the tray is slidably connected into the limiting frame through the protruding strips. According to the device, the partition plates are arranged in the placing disc, so that parts poured into the placing disc can be conveniently and regularly combed, the parts can smoothly slide into the corresponding discharging holes, the number of times of reciprocating screening of the parts is reduced, the abrasion rate of the parts in the disc placing process is reduced, and the practicability of the device is improved. And the machining quality of the parts is indirectly improved.

The invention discloses an integrated transformer with a dynamic magnetic flux adjusting function, and belongs to the technical field of transformers. The packaging shell is fixedly arranged on the substrate, and a sealed mounting cavity is defined by the packaging shell and the substrate; the magnetic core assembly is arranged in the sealed mounting cavity and comprises two magnetic core bodies which are oppositely arranged in the axial direction and an elastic supporting piece, the central areas of the two magnetic core bodies are oppositely combined to form a central magnetic column, a variable air gap is formed between the edge areas, and the elastic supporting piece is connected with the magnetic core bodies and the substrate or the packaging shell; the elastic reset device is used for enabling the magnetic core body to float in the axial direction and achieve elastic reset. The planar spiral coil is fixedly arranged on the substrate, is arranged between the internal gaps of the two magnetic core bodies, and is coaxially arranged around the central magnetic column; the magnetic flux adjusting mechanism is arranged on the peripheral side of the magnetic core assembly in a surrounding mode. According to the transformer, continuous dynamic adjustment of working magnetic flux can be achieved, the multiple sets of piezoelectric ceramic pieces which are evenly arranged in the circumferential direction enable the magnetic core body to be stressed in a balanced mode, movement is stable, and deflection and clamping stagnation of the magnetic core body are effectively avoided.

The utility model discloses a surgical crane tower with anti -shaking structure, including crane tower transmission subassembly and crane tower main part, the fixed end of crane tower transmission subassembly is fixedly arranged on the ceiling of room, and the movable end of crane tower transmission subassembly is connected with crane tower main part, and drives crane tower main part to be active through crane tower transmission subassembly, the fixed end of crane tower transmission subassembly is provided with extruded silica gel pad, when crane tower transmission subassembly is fixed on the ceiling, extruded silica gel pad is contacted with the ceiling, and then plays the role of shock attenuation and anti -shaking. The utility model discloses crane tower transmission subassembly has adopted extruded silica gel pad, effectively reduced the vibration and noise of fixed on the ceiling, thereby reduced the interference of external environment to crane tower main part, and through the combination of guide seat and guide rod, make the movement of movable plate more stable, greatly prevented the dither of crane tower main part in the use process, improved the overall stability of equipment.

The utility model relates to the technical field of bridge construction, and discloses a crossing movable platform attached to a high-altitude bridge, which comprises a space structure body, the top end of the space structure body is fixedly connected with the bottom surface of the bridge, and the space structure body comprises a plurality of polygonal annular frames; each polygonal annular frame comprises a polygonal bottom frame and vertical supporting frames distributed in the circumferential direction of the bottom frame. The multiple polygonal annular frames are sequentially arranged in the length direction of the bridge. The anti-falling net is arranged on the bottom surface and the circumferential direction of the space structure body in a tensioning manner; the climbing entertainment device is located in the space structure body and attached to the space structure body; the corners of the bottom frames of every two adjacent polygonal annular frames are aligned at the top points and connected through circumferential dampers used for consuming horizontal vibration, and metal dampers used for consuming vertical vibration are arranged between the top of the space structure body and the bridge. The technical problems that an ultra-long movable platform attached to a high-altitude bridge is greatly influenced by wind shock, and the sense of safety of tourists is low are solved.

The present application provides a sintering machine trolley, comprising a trolley body, end bars mounted on the trolley body and rollers, the end bars are detachably connected with the trolley body through spring pin mechanisms, and the rollers are bearing embedded rollers in a modular assembly form. The present application improves the fixing and mounting mode of the end bars and the structure form and mounting mode of the rollers, overcomes the defects of the complex mounting structure of the end bars and the rollers in the traditional trolley, and the difficulty in mounting and detaching, makes the mounting and detaching of the end bars and the rollers more convenient and fast, and the structure is compact and reasonable, and easy to maintain.

The utility model provides a tractor is with reinforcing type valley union front drive axle relates to mechanical manufacturing field, the utility model discloses valley union front drive axle main body, the utility model discloses in the hydraulic pressure rod working process on valley union front drive axle main body can first fill up the oil tank with lubricating oil, when needing lubrication, start the electric telescopic handle fixed in the oil tank inner wall one side, the output end of electric telescopic handle drives piston plate to slide to one end, extrude the lubricating oil in the oil tank and enter the oil pipe, then convey to the ring frame, when the output rod of hydraulic pressure rod moves to and fro in the fixed rod inner wall, will drive the rolling of several ball bearings in the inner wall of ring frame, take out the lubricating oil in the ring frame inside evenly and smear on the outer surface of hydraulic pressure rod output rod, reduce the friction between output rod and fixed rod, reduce the motion resistance of output rod, can reduce the wear and tear between hydraulic pressure rod output rod and fixed rod in this way, improve the service life, avoid the influence tractor's steering accuracy and operation stability, reduce maintenance cost.

This invention provides an air guiding device, an air conditioner, and a control method. The ventilation equipment has an air outlet. The air guiding device includes a rotating shaft and air guiding components. The rotating shaft is rotatably mounted at the air outlet. Multiple air guiding components are arranged alternately along the circumference of the rotating shaft. When the rotating shaft rotates, the multiple air guiding components can rotate synchronously. By controlling the rotating shaft to rotate to different angles, the air outlet can achieve simultaneous upward and downward airflow, upward airflow alone, and downward airflow alone. The airflow volume of the air outlet can be adjusted by adjusting the rotation angle of the rotating shaft. The structure and control method are simple, occupy little space, and have stable movement. The two sides of the first air guiding component in the thickness direction are both airfoil-like structures, and the connection between the air guiding component and the rotating shaft is smoothly transitioned to reduce air resistance. The target rotation angle of the rotating shaft is determined according to the current position and target position of the air guiding component. By controlling the rotating shaft to rotate to the target rotation angle, the air outlet can be in the target state.

This invention discloses a traction winding and unloading device, belonging to the field of roll material production technology. The device includes a traction device, a floating fly knife device, a dual-shaft alternating winding device, and an unloading device. The traction device has edge trimming and tension adjustment functions. The floating fly knife device is equipped with a floating roller assembly and an L-shaped flipping guide groove to achieve clamping traction during cutting and automatic knife lifting after cutting. The dual-shaft alternating winding device realizes alternating winding of the two air-expanding shafts at two workstations through a flipping disc and a clamping assembly, and is equipped with a moving pressure roller that adjusts with the roll diameter. The unloading device consists of a moving trolley, a shaft pulling device, and an unloading trolley, which can automatically complete full roll grabbing, shaft pulling, air release unloading, and transfer. This invention realizes full-process automation from traction, edge trimming, fixed-length cutting, continuous winding to automatic unloading, and has the advantages of high production efficiency, good cutting and winding accuracy, stable operation, and wide applicability. It is suitable for the continuous production of roll materials such as film, non-woven fabric, paper, and aluminum foil.

The utility model belongs to the field of laser cutting technology, concretely relates to a kind of high -efficient mobile laser cutting device.It includes bottom plate, first support frame, second support frame, fixed base, clamping assembly, propulsion assembly, cutting assembly and workstation: first support frame and second support frame are vertically installed on bottom plate;Workstation is horizontally erected between first support frame and second support frame;The upper portion and lower portion of first support frame are respectively fixed with first lead screw sliding rail and second lead screw sliding rail, and the other end of first lead screw sliding rail and second lead screw sliding rail is respectively fixed in the upper portion and lower portion of second support frame;Clamping assembly is slidably connected with first lead screw sliding rail and second lead screw sliding rail by sliding block;Cutting assembly is installed on the lower surface of first lead screw sliding rail;Propulsion assembly is installed on one side of workstation.The utility model can effectively suppress the vibration in cutting process, ensure high-precision cutting quality, and avoid the eccentric load problem easily produced by single-track structure.

The invention provides a stator outer diameter roundness detection mechanism and method based on internal expansion type positioning, and relates to the technical field of precision measurement, the stator outer diameter roundness detection mechanism comprises a base station, a rotation driving module, a product positioning module, a lifting driving module and a detection module, the product positioning module adopts an internal expansion type mechanism composed of a top column, a positioning block and a wedge block group, the wedge block group is driven to radially tighten the inner hole of the stator through the axial movement of the top column, so that different inner diameter tolerances are adapted, high-precision and non-eccentric positioning is realized, during detection, the lifting driving module drives the plurality of contact displacement sensors to move along the axial direction of the stator and scan the outer diameter contour of the stator iron core unit, and meanwhile, the rotating driving module is used for indexing, so that the detection precision is improved. According to the invention, automatic and high-efficiency detection of the outer diameter roundness of all stator core units is realized, the problems of inaccurate positioning and poor universality of a traditional jig are effectively solved, and the detection precision and efficiency are remarkably improved.

The utility model relates to a self-rotating pig for oil and natural gas pipeline, belong to pipeline cleaning technical field, the pig includes box, support walking mechanism and install the leather bowl of box outer wall, the box is hollow body, is equipped with the battery in the box and is installed with the drive motor for providing power through the support frame, the output shaft of drive motor and the central axis of box coincide, the first output shaft of drive motor can detachable connection support walking mechanism, support walking mechanism includes with the first output shaft connection first pivot and installs the spiral plate on the first pivot, and the spiral plate outer edge evenly is equipped with the gyro wheel that agrees with the pipeline inner wall. The utility model adopts one motor to match the spiral plate with gyro wheel to can complete the self-rotation advance of pig, greatly alleviates the counterweight, simple structure, convenient to use.

The invention discloses a flexible display screen folding and unfolding device and an electronic device, and relates to the technical field of electronic equipment.The flexible display screen folding and unfolding device comprises a first support, a second support and a driving mechanism, and the first support is slidably connected with the second support; the driving mechanism is arranged on the first support and the second support and used for driving the first support and the second support to slide relatively, the driving mechanism comprises a first driving assembly and a second driving assembly, and the first driving assembly is fixedly arranged on the first support and connected with the second support; the second driving assembly is fixedly arranged on the second support and connected with the first support, so that the second driving assembly and the first support have a more stable contact state and are not prone to deviation or separation under the dynamic load, continuous transmission of force is kept, vibration and noise generated by unstable interaction force can be reduced, and the service life of the device is prolonged. And the relative movement of the first bracket and the second bracket can be ensured to be more stable and smoother.

The application relates to the technical field of medical devices, and provides a visual laryngoscope, which comprises a handle main body, a front end support connected to the distal end of the handle main body, a first expansion member and a second expansion member which are respectively hinged to the front end support and each comprise a support base body and a flexible buffer layer, a driving assembly arranged on the handle main body, and a transmission mechanism connecting the driving assembly and the two expansion members, wherein the transmission mechanism converts power into synchronous reverse deflection movements of the two expansion members around respective hinged shafts in response to the driving of the driving assembly to realize bidirectional expansion of a target cavity. The application realizes bidirectional flexible expansion of a pharyngeal cavity and noninvasive clear exposure of a glottis, and improves the success rate and safety of difficult airway intubation.

The utility model discloses a cleaning mechanism of a forming machine, which belongs to the technical field of forming machine cleaning and comprises a forming machine body and a cleaning mechanism main body arranged on the forming machine body. The cleaning mechanism body comprises a cleaning piece used for cleaning the forming machine body, a driving piece used for driving the cleaning piece to move and a mounting frame used for mounting the driving piece. A mounting plate is arranged on the forming machine body, and the mounting frame is detachably connected with the mounting plate; the output end of the driving part is in transmission connection with the cleaning part so as to drive the cleaning part to reciprocate in the direction parallel to the to-be-cleaned surface of the forming machine body. Compared with a manual cleaning mode and a traditional mechanical cleaning mode, the cleaning mechanism of the forming machine with the structure has the advantages that the cleaning efficiency is greatly improved, the cleaning time is shortened, and continuous and stable operation of the forming machine is guaranteed.

The utility model provides a kind of anti-leakage type automatic water fountain fixing base, it is related to drinking water equipment technical field, including fixed part, fixed part bottom is equipped with water storage part, fixed part peripheral surface is fixed with extension piece, extension piece inner wall is fixed with mounting part, extension piece one end is slidably connected with drinking water part, extension piece inner wall both sides are all equipped with L type groove, drinking water part one side is fixed with multiple L type pieces, L type piece side surface is slidably connected with L type groove inner wall.The utility model has realized by the elastic potential energy of lifting spring to make drinking water part when water is less gradually be lifted up, make L type piece ascend to make water baffle leave water channel, make water storage part water pass through water channel and hose and finally by shielding plate flow to drinking water part, when water is more, its dead weight makes drinking water part descend water baffle and block mounting part water channel, to form automatic water inlet and water blocking without floating ball, prevent water from being wrongly injected to cause water frequent overflow and leak, reach the purpose of improving anti-leakage.

The utility model discloses a printing and dyeing wastewater biodegradation treatment device with scrape slag structure, concretely relates to water treatment technical field, and includes the treatment pond, and the inside fixed setting of treatment pond has the filter plate, and the top of treatment pond is provided with fixed frame, and the inside of fixed frame is provided with scrape slag mechanism, and scrape slag mechanism includes the sliding block of sliding setting in the inside of fixed frame, and the top fixed setting of sliding block has first U -shaped frame, and the bottom fixed setting of first U -shaped frame has first scraper, and the both sides fixed setting of first scraper has the guide block, and the surface of treatment pond is provided with the guide groove, and the guide block is slidably connected with guide groove. The utility model discloses double scraper cooperation scrape slag, can remove water surface scum, can also push the filter residue on filter plate, realizes all -round dregs cleaning, and timely discharge dregs, creates good condition for aeration efficient oxygen supply and microorganism degradation, improves overall processing efficiency, and has practicality and economy.

The utility model relates to the technical field of inspection well cleaning, and discloses a cleaning mechanism and a cleaning device, the cleaning mechanism comprises a base, a moving assembly, a cleaning assembly and an auxiliary wheel assembly, the moving assembly comprises two moving wheel groups, the two moving wheel groups are slidably arranged on the bottom surface of the base along the moving direction of the cleaning mechanism and drive the cleaning mechanism to move, the cleaning assembly comprises a first cleaning assembly and a second cleaning assembly, the first cleaning assembly and the second cleaning assembly are arranged on the base at intervals, one end of the auxiliary wheel assembly is installed on the bottom surface of the base, and the other end is used for abutting against the outer side wall of the inspection well, the two moving wheel groups can slide along the direction perpendicular to the moving direction of the cleaning mechanism to adjust the horizontal distance between the moving wheel groups and the auxiliary wheel assembly, so that the moving wheel groups and the auxiliary wheel assembly can more evenly disperse the gravity of the cleaning mechanism to themselves, and the moving stability of the cleaning mechanism is improved.

The application relates to the technical field of automobile part molds, and discloses an automobile part mold guide column, which comprises a lower mold and an upper mold, wherein the upper mold is located above the lower mold. The automobile part mold guide column is provided with a soft sleeve outside the ball guide column, can play a buffering and isolating role when the mold and the ball guide column relatively move, and the soft sleeve made of polytetrafluoroethylene has very low friction coefficient and good self-lubricating property. When the guide hole of the mold is in contact with the ball guide column and relatively slides, the soft sleeve first contacts the inner wall of the guide hole, the soft and smooth surface of the soft sleeve can effectively reduce the direct friction force between the two, the surface material of the ball guide column or the guide hole of the mold is prevented from being scraped and worn due to high-intensity friction, meanwhile, the soft sleeve can also fill the possible tiny gap between the ball guide column and the guide hole, the movement is more stable, the additional friction and wear caused by shaking and impact are reduced, and the pulling phenomenon of the ball guide column and the mold is avoided.

The utility model discloses a kind of multi-station quick switching type mould structure, it is related to the technical field of multi-station mould, the multi-station quick switching type mould structure, including support frame and the rotating shaft of being movably arranged on support frame, the rotating shaft is provided with multiple upper dies by first connecting piece, rotating shaft is also provided with the lower die of corresponding one-to-one with upper die by second connecting piece;The support frame is also provided with the driving component for enabling upper die to move downwards, the support frame is provided with the support component for supporting lower die, by setting support frame, rotating shaft, first connecting piece, upper die, second connecting piece and lower die, multiple upper dies and lower dies are installed on rotating shaft by connecting piece, cooperate the driving component and support component on support frame, the quick switching of different mould station is realized, can efficiently adapt to a variety of stamping needs, solve the problem that traditional mould is difficult to quickly change station and carry out different stamping operation.

The utility model discloses a mechanical arm structure for a tightening assembly test, which comprises a base, a stand column fixed at the center of the top end of the base, a top seat mounted at one end of the stand column far away from the base, a transmission case arranged above the top seat, and a gear motor mounted at the bottom of the transmission case, the bottom end of the gear motor extends out of the transmission box and is connected with the top end of the top seat, a first driving arm is rotationally installed on the inner wall of the transmission box, one end of the first driving arm extends out of the transmission box and is rotationally provided with a second driving arm, and a limiting arm is rotationally installed on the outer wall of the end, close to the first driving arm, of the second driving arm; two linkage arms are installed at the end, away from the second driving arm, of the limiting arm, a base is installed at the end, away from the limiting arm, of each linkage arm, and a plurality of reinforcing ribs are arranged on the outer wall of the stand column. The tightening device is simple in structure, the tightening shaft is easy to move and operate, the tightening device can quickly and effectively move to all positions in the stroke range, and space limiting is avoided.

The utility model discloses a transmission assembly, a power transmission device and a vehicle, the transmission assembly comprises a power shaft, a driven gear, a transmission part and a buffer part, a driving gear is arranged on the power shaft, the driving gear is suitable for being meshed with a power output device, a matching section is formed on the power shaft, and the driven gear is arranged on the matching section in a sleeving mode; the driven gear can rotate relative to the matching section, a first circumferential matching part is arranged on the driven gear, the transmission part is arranged on the matching section and rotates synchronously with the power shaft, a second circumferential matching part is arranged on the transmission part, and the second circumferential matching part and the first circumferential matching part are arranged correspondingly. When the driven gear moves in the circumferential direction relative to the matching section, the first circumferential matching part and the second circumferential matching part get close to each other or get away from each other, the buffering piece is connected between the first circumferential matching part and the second circumferential matching part, and the buffering capacity of the transmission assembly can be improved.