126 results about "Long arm" patented technology

This invention relates to the field of medical devices, and more particularly to a valve clip with a locking mechanism, comprising a first clamping arm, a second clamping arm, a connecting member, a push-pull device, and a locking device. The locking device partially cooperates with the connecting member, and includes a locking head and a self-locking rod. The connecting member is hinged to the first clamping arm and the second clamping arm respectively. The clamping arm includes a long arm and a short arm. One end of the long arm is hinged to the push-pull device, and one end of the short arm is provided with a locking part. When the push-pull device is operated to increase the angle between the long arms of the first and second clamping arms, the locking part on the first clamping arm and the locking part on the second clamping arm are partially misaligned. When the push-pull device is operated to decrease the angle between the long arms of the first and second clamping arms, the locking device is moved to allow the locking head to engage with the locking part and lock.

The invention discloses water bloom algae salvage equipment, and particularly relates to the technical field of algae salvage, the water bloom algae salvage equipment comprises an assembly frame, two long arm assemblies are symmetrically mounted on two sides of the front end of the assembly frame, the two long arm assemblies are used for actively separating and intercepting a salvage area, a mounting seat is mounted at the top of the assembly frame, and a gathering mechanism is additionally arranged on one side of the mounting seat; the gathering mechanism is composed of a reciprocating assembly and two releasing assemblies. According to the salvaging equipment, the two releasing assemblies are released in a salvaging area in a reciprocating mode, full nanobubble covering can be completed on a working area, algae in the salvaging area can be rapidly gathered, the salvaging efficiency is improved, the treatment effect is improved, the releasing assemblies are synchronously linked with the pushing mechanism to complete actions, and the salvaging efficiency is improved. The pushing mechanism is used for stirring and disturbing the water body in the areas on the two sides of the release assembly, so that surrounding algae rapidly flow to be in contact with the nanobubbles to complete gathering, the gathering effect of the algae is further improved, and the treatment precision is enhanced.

The utility model provides an elastic sheet which comprises a long arm and an elastic arm connected to the long arm, the long arm is provided with symmetrical strip-shaped through holes, the elastic arm comprises a plurality of elastic arms connected to the two ends of the strip-shaped through holes respectively, the elastic arms and the long arm are integrally formed, and the elastic arms at the two ends of the strip-shaped through holes are arranged in a mirror image mode. According to the elastic sheet, after the strip-shaped through hole is punched in the long arm, the material of the strip-shaped through hole is not separated from the long arm, the material of the strip-shaped through hole is bent to form the elastic arm, and the elastic arm and the long arm are integrally formed, so that on one hand, the strength of the elastic arm and the long arm can be effectively guaranteed, and the elastic arm is not easy to separate from the long arm; multiple installation steps are omitted, the elastic arm does not need to be fixed to the long arm after being machined again, and the machining efficiency is effectively improved.

Textile carrying handle on the back of a children’s dungarees, 1. characterized in that the textile carrying handle is sewn onto the back of the trousers, 2. characterized in that the carrying handle is sewn on in such a way that the child can be held, carried or guided in a statically safe position, 3. characterized in that the carrying handle makes it possible to pick up the child by the carrying handle of the children's dungarees, to pick him up in the arm or to lead him by the long arm.

The utility model discloses an automatic grabbing mechanism which comprises an assembling plate, and a sinking groove with a rack is formed in the top end of the assembling plate. The distance adjusting mechanism is installed above the assembling plate in a sliding mode, and the distance adjusting mechanism is matched with the sinking groove; the side arms are vertically and symmetrically arranged on one side of the long arm, the side arms are installed on the distance adjusting mechanism, and when the distance adjusting mechanism is adjusted in the left-right direction, only the transverse block needs to be lifted upwards, so that the tooth block is separated from the rack in the sinking groove to be matched, and the position of the distance adjusting mechanism can be easily adjusted; when the distance adjusting mechanism is adjusted to a proper position, the transverse block only needs to be put down, so that the tooth block is matched with the rack in the sinking groove again, and the position stabilization of the distance adjusting mechanism can be completed; the process does not need a complicated tool or an additional fixing piece, so that the mounting and adjusting steps are greatly simplified.

The utility model provides a kind of movement device of cylinder sewing machine feed dog, belong to sewing machine technical field.It solves the problem that existing feed dog movement device is not applicable to cylinder sewing machine.This sewing machine includes the cabinet with long arm, the first end of swing arm is fixed with feed dog, the middle part of swing arm is hinged with long arm, the first end of lifting tooth bar is hinged with long arm, the first end of lifting tooth bar is located directly below the first end of swing arm, lower shaft can drive swing arm swing back and forth around its hinged point by feeding assembly, lower shaft can drive lifting tooth bar swing up and down around its hinged point by lifting tooth assembly, the first end of lifting tooth bar swing upwards can make the first end of swing arm move upwards, swing arm can make the first end of swing arm move downwards under the action of its elasticity.This movement device of cylinder sewing machine feed dog has the advantages of reasonable use of space, smooth movement of cylinder sewing machine feed dog.

The utility model discloses an insertion type long arm draw hook and a multi-hook buccal tube, the insertion type long arm draw hook comprises a tenon tongue part, a draw arm and at least one draw hook, the tenon tongue part is used for being installed on the buccal tube, the draw arm is connected to the side, away from the buccal tube, of the tenon tongue part, and a certain included angle is formed between the draw arm and the tenon tongue part; the traction hook is arranged at one end of the traction arm away from the tenon tongue part. A certain included angle is formed between the tenon tongue part and the traction arm, so that the traction arm can avoid gingiva, compression on the gingiva is effectively avoided, and the comfort level of a patient during wearing is further improved while the functionality of the traction arm in clinical application is ensured.

Provided is a long arm supported in a cantilever manner with light weight and high rigidity. The rod 30 is formed from rods 31-33 so as to be a multi-stage telescopic configuration. The rods 32, 33 respectively have upright columns 42, 43 on the tips. The wire 11 is suspended between the tip of the rod 31 and the lead end of the arm via the top of the column 42. The wire 12 is suspended between the base of the column 42 and the lead end of the arm via the top of the column 42. The wire 22 is suspended between the top of the column 42 and the lead end of the arm via the top of the column 43. The tension generation means 50 pulls the wires 10, 20. The air pressure generation means 60 applies pressure to the inside of the rod 30.

The utility model belongs to the technical field of cleaning devices, and particularly relates to a movable long arm type cleaning device which comprises a base and a supporting bottom, a water pump is arranged at the upper end of the base, a cleaning rod is arranged at the upper end of the water pump, a water tank is arranged at the upper end of the base, and a water outlet pipe is fixedly connected to the front face of the water tank. A water inlet pipe is inserted into the outer side of the water outlet pipe, the water inlet pipe is fixedly connected with the water pump, a power box is arranged on the base, a fixing block is fixedly connected to the front face of the water tank, and a limiting sleeve is rotationally connected to the outer side of the fixing block. According to the gas station awning cleaning device, the base, the cleaning rod, the universal wheels and other components are arranged, the base can drive the cleaning rod to clean the gas station awning, the air cylinder, the movable base and other components are arranged, the height of the base can be adjusted, and therefore the cleaning rod can better clean the gas station awning.

The utility model provides a balance forklift vertical holding clamp which is characterized in that an accessory connecting mechanism is arranged on one side of a base plate; the two mechanical arms are hinged to the side, away from the forklift, of the base plate correspondingly and arranged in the horizontal direction. The two mechanical arms are different in length and are respectively a long arm and a short arm; the long arm and the short arm are arc-shaped respectively, and the concave surfaces are positioned on the sides, close to each other, of the long arm and the short arm respectively; the driving mechanism is installed on the base plate, connected with the mechanical arm and used for driving the mechanical arm to rotate relatively. The butt joint mechanism is hinged to the end, away from the base plate, of the mechanical arm. By means of the long arm and the short arm which are different in length and are in an arc shape, when coiled floor heating pipes with different diameters are grabbed, more flexible grabbing action can be achieved through the rotating speed difference; the long arm expands the overall grabbing radius and can adapt to various package specifications, the short arm is relatively flexible, the clamping capacity is improved through three-point contact, and therefore the carrying applicability of the packaged floor heating pipe is greatly improved.

The utility model relates to the field of data centers, and discloses an independent insertion assisting device and a data center, which are used for realizing manual insertion interconnection of a server and a cabinet on the basis of not occupying the space of the server. The independent insertion assisting device comprises a fixed plate, a movable plate, an insertion assisting handle and a fixing structure. The fixing structure is arranged on the fixed plate and used for fixing the fixed plate; the fixed plate and the movable plate are arranged in the first direction, and the movable plate can be driven by the insertion assisting handle to be away from or close to the fixed plate in the first direction. The insertion assisting handle comprises a long arm and a short arm, the first end of the short arm is slidably connected with the movable plate in the second direction, and the second end of the short arm is rotationally connected with the fixed plate through a rotating shaft. The second direction is perpendicular to the first direction; the first end of the long arm is connected with the second end of the short arm, and the second end of the long arm penetrates through the fixed plate and extends out of the side, away from the movable plate, of the fixed plate. The distance between the second end of the long arm and the rotating shaft is larger than that between the first end of the long arm and the rotating shaft.

This invention discloses a welding process equipment with an internal cavity long-arm fixed support mechanism, including a support base, a bottom positioning mechanism on the support base, and an internal cavity fixed support mechanism, a bottom clamping mechanism, and a side clamping mechanism. The bottom positioning mechanism and the internal cavity fixed support mechanism cooperate to form a welding part placement area. This invention enables rapid, accurate, and stable clamping of welding parts, as well as balanced support for the welding parts, preventing deformation and stress during the welding process, improving welding quality and efficiency, reducing labor costs and errors, and is applicable to welding parts of more shapes and sizes.

A long arm type compact wheel bucket excavator relates to mechanical equipment for open pit mining, comprising a supporting mechanism, a bucket wheel driving mechanism, a discharging arm rotating mechanism, a crawler walking mechanism and a tensioning mechanism, the discharging arm rotating mechanism comprising a main machine walking mechanism, a supporting base assembly, a rotating platform assembly and an adjusting plate assembly; the supporting base assembly comprising a central pipe vertically fixed on the main machine walking mechanism and a mounting seat fixed on the central pipe; the rotating platform assembly comprising a rotating platform rotatably supported on an L-shaped beam; the adjusting plate assembly comprising an adjusting plate body, a lower connecting shaft slide way symmetrically arranged on both sides of the adjusting plate body and an upper connecting shaft slide groove symmetrically arranged on the other two sides of the adjusting plate body, the guide directions of the lower connecting shaft slide way and the upper connecting shaft slide groove being perpendicular to each other. The wheel bucket excavator does not need to additionally set a reclaimer and will not generate triangular coal, and has the advantages of good stress characteristics, good safety and the like.

The utility model provides a novel draw hook which comprises a draw hook body, the draw hook body comprises a long-arm draw hook, a short-arm draw hook and a shoulder connecting body, and the long-arm draw hook and the short-arm draw hook are connected in an L shape through the shoulder connecting body; the shoulder connecting body is provided with at least one group of kirschner wire positioning holes, and the extending direction of the kirschner wire positioning holes is parallel to the length direction of the short-arm drag hook. Or / and the extending direction of the kirschner wire positioning holes is parallel to the length direction of the short-arm drag hook, and the extending direction of all the kirschner wire positioning holes is located on the outer side of the body; through the double-end design of the retractor body, the long-arm retractor or the short-arm retractor can be selected according to the quantity of soft tissues; the Kirschner wire positioning hole is formed in the shoulder connecting body of the drag hook body, and during an orthopedic operation, after the drag hook is dragged to a preset position, a Kirschner wire is driven into the Kirschner wire positioning hole to fix the drag hook body on a bone substance, so that an operation assistant can be liberated, meanwhile, the number of operation instruments is reduced, and the operation is conveniently carried out.

To realize a module type replaceable transport unit, height adjustment of the transport unit, removal of the transport unit, and automatic reduction of a chassis into the smallest folding size without disassembly.SOLUTION: A folding device for transporting goods includes: a first platform; a second platform; and a lift having a plurality of folding crossing portions rotatably coupled to the first platform and the second platform. Each of the plurality of folding crossing portions includes a first long arm, a second long arm and a short arm. The first long arm is fixedly connected to the second long arm.SELECTED DRAWING: Figure 6

The utility model relates to the technical field of spray guns, in particular to a spray gun mechanism for spraying, which comprises a gun body, the gun body comprises a handle, a gun barrel, a coating joint and a trigger, the bottom of the handle of the gun body is rotatably connected with a connecting rod, and one end of the connecting rod is fixedly connected with a bending rod. The end, away from the connecting rod, of the bent rod is fixedly connected with a lengthening rod, and the end, away from the bent rod, of the lengthening rod is fixedly connected with a bandage. The gun has the advantages that when the gun body is held, the binding band at the tail end of the lengthening rod is located below the arm of a user, the arm of the user presses the lengthening rod downwards through the binding band, supporting force is provided for the gun body according to the rod tilting principle, and therefore the force applied to the wrist can be reduced, and the problem of wrist ache can be solved; the length of the lengthening rod can be adjusted, so that the length of the lengthening rod can be properly adjusted according to the length of the arm of a user, the device is suitable for different users, and more labor is saved when the user with the longer arm operates the device.

The utility model provides a carton line pressing wheel structure which effectively solves the problems that in the prior art, a line pressing device cannot meet the line pressing requirements of cartons with different thicknesses and sizes, and the application range is limited. According to the technical scheme for solving the problems, the device comprises a U-shaped rack, two horizontal square shafts are arranged in the rack, a plurality of positioning cylinders are buckled on the square shafts, the positioning cylinders on the two square shafts are in one-to-one correspondence in the vertical direction, long arms are fixed to the front ends and the rear ends of the positioning cylinders correspondingly, pressing wheels are fixed to the ends of the long arms, and the two long arms located on the same positioning cylinder form a V-shaped structure. The openings of the two V-shaped structures which correspond up and down are opposite; the square shafts can rotate, and the distance between the two square shafts can be increased or decreased; the carton line pressing device is ingenious in structure, capable of meeting the line pressing requirements of cartons of various thicknesses, simple in structure and capable of meeting the line pressing requirements of the cartons at the present stage.

The utility model discloses an automatic propulsion auxiliary device based on lengthened cutter machining, which relates to the field of lengthened cutter machining and comprises a base, a movable block is fixedly mounted at the top of the base, a rotating shaft is fixedly mounted above the movable block, a long arm is rotatably mounted on the outer side of the rotating shaft, and a polishing wheel is rotatably mounted on one side of the long arm. The grinding wheel is electrically connected with an external power source, a folding assembly is movably installed between the long arm and the base and electrically connected with the external power source, a cushion block is fixedly installed above the base, a positioning seat is fixedly installed above the cushion block, a tool bit workpiece is arranged in the positioning seat and corresponds to the grinding wheel, and the grinding wheel is electrically connected with the tool bit workpiece. According to the tool bit machining device, the machining process can be monitored in real time, machining safety is improved, manual observation is not needed due to the two-way propelling mode, and working efficiency is improved.

The utility model relates to a novel bonding type orthodontic anterior molar auxiliary device. The novel bonding type orthodontic advanced molar auxiliary device comprises cast belt rings, a lingual arch, a long-arm traction hook and an arch wire, the cast belt rings are installed on a first premolar and a second premolar on the two sides and connected through the lingual arch, and the cast belt rings are installed on the second molar on one side of a gap; a bracket and a buccal tube are respectively arranged on the cast belt rings on the buccal sides of the second premolar and the second molar on one side of the gap, an arch wire is fixed between the bracket and the buccal tube, and long-arm traction hooks are mounted on the bracket and the buccal tube and are connected through an elastic chain ring. According to the scheme provided by the invention, through buccal tongue side double-track stress application, the lingual inclination and torsion of the molars when the molars move forwards are greatly avoided, and the overall movement of the molars is realized; the applied force can be adjusted, the correction effect is improved, the anchorage strength is high, and the forward molar effect is stable.

The utility model discloses a kind of suspension long component tail end reinforcing structures, including suspension long arm, the one end of the suspension long arm is throughly provided with mounting seat, to install connection to entire suspension long component, the end surface of the suspension long arm is tightly provided with fixed block, to provide the stable strength of entire suspension long component in use, the one end of the suspension long arm is provided with suspension end, when being used to entire suspension long component, it can be injected with suspension end and be inserted in the inside of mould to carry out injection molding processing, improve the convenience in processing process. The utility model increases fixed block in the one end of suspension long component, under the holding of fixed block, so that suspension long component can keep stable for a long time in use, and improve the service life of suspension long component.

The utility model relates to the technical field of livestock breeding, and discloses a long-arm convenient shovel for cleaning feed trough manure, which comprises a shovel body and a handle, the shovel body comprises a lower shovel and a top cover, the top cover is rotatably connected with the lower shovel, the handle comprises a first operating rod and a second operating rod, the first operating rod is fixedly connected with the end part of the lower shovel, and the second operating rod is fixedly connected with the end part of the lower shovel. The second operating rod is fixedly connected with the end face of the top cover, the first operating rod comprises two extension rods, the bottom ends of the two extension rods are fixedly connected with the end face of the lower shovel, and connecting blocks are fixedly installed at the top ends of the two extension rods. According to the long-arm convenient shovel for cleaning the excrement in the feed trough, the first operating rod and the second operating rod are arranged to control the lower shovel body and the top cover respectively, the lower shovel body is used for shoveling sundries such as the excrement in the feed trough, the top cover covers the lower shovel body, the sundries can be well prevented from sliding off, and the design of the long handle solves the problems that manual bowing picking is inconvenient and low in efficiency; and a breeder can conveniently complete the feeding trough cleaning work without getting off the feeding car.

The utility model discloses a heavy-duty dustproof hinge, which relates to the technical field of hinges, and comprises a bottom plate and a support arm for installing a window, the middle section of the bottom of the support arm is hinged with a long arm through a pin shaft, the top of the bottom plate is clamped with a connecting gasket, the top of the connecting gasket is provided with a short arm and a middle arm, and the short arm is connected with the middle arm. The short arm and the middle arm are hinged to the bottom plate through pin shafts, and the short arm is hinged to the supporting arm through a pin shaft; according to the sliding support hinge, the square rivet is riveted at the bottom of the supporting arm in a pressing mode, when the sliding support hinge is opened to the maximum degree, the angle limiting inclined face on the short arm and the angle limiting inclined face on the middle arm make contact with each other and are clamped with each other, the square rivet makes contact with the long arm and blocks the long arm, and a secondary wind resistance structure is achieved. And continuous acting force acts on the square rivet, the angle limiting inclined plane on the short arm and the angle limiting inclined plane on the middle arm, so that the wind resistance is improved, and the deformation and damage of the sliding support hinge are avoided.

The utility model relates to an adjustable rotating structure of a display screen on a marine display and control console, which comprises a display and control console frame body and the display screen, one end of the display screen is connected with the outside of the upper part of the display and control console frame body through a hinge, and a rocker arm structure is arranged between the back surface of the display screen and the inside of the upper part of the display and control console frame body; the rocker arm structure comprises a fixed arm, a movable short arm, a movable long arm, a supporting seat and an adapter plate, the fixed arm is connected into the upper portion of the display and control table frame, one end of the movable short arm is rotationally connected with the fixed arm, the other end of the movable short arm is rotationally connected with one end of the movable long arm, the other end of the movable long arm is rotationally connected with the supporting seat, and the supporting seat is connected to the adapter plate. The adapter plate is fixedly arranged in the middle of the back of the display screen. According to the utility model, through the combination of the hinge and the rocker arm structure, turning and supporting moment at any angle of 0-90 degrees can be provided for the display screen, so that the display screen has the function of hovering at any angle, and an operator can adjust the use visual angle at multiple angles and carry out maintenance work.

The utility model provides a charging pile swing arm device and a charging pile. The charging pile swing arm device comprises a base; the main shaft comprises a first part and a second part, the first part is located in the base, the second part extends out of the base, and the main shaft is configured to rotate in the base; the swing arm is connected with the second part of the main shaft, the swing arm drives the main shaft to rotate when swinging, the swing arm comprises a main body part and a connecting part located at at least one end of the main body part, and the connecting part and the main body part are connected in a non-integrated mode. According to the charging pile swing arm device provided by the embodiment of the invention, the swing arm is high in flexibility, and long arms with different lengths can be directly machined according to different machine types.

The utility model discloses an excavator lengthened working arm which comprises an excavator small arm, a lengthened arm is connected to the front end of the excavator small arm, the front portion and the rear portion of the upper portion of the lengthened arm are fixedly hinged to a connecting rod through supporting rods, one end of the connecting rod is fixedly hinged to a hydraulic cylinder arranged on the excavator small arm, and the other end of the connecting rod is fixedly hinged to an excavator bucket connecting rod. The extension jib is connected to the small arm of the standard excavator, the guide stabilizing assembly is arranged on the lower portion of the extension jib, the extension jib is connected to the small arm of the standard excavator, the extension jib is connected to the small arm of the standard excavator, and the standard excavator can achieve the use function of a long-arm excavator by modifying the extension jib connected to the small arm of the excavator. The use range of the standard excavator is widened, the equipment utilization rate of the standard excavator is increased, the problem that the special excavator for the extension jib is difficult to lease is solved, and the construction cost of an enterprise is greatly reduced.

The utility model discloses a novel long-arm positive-axis spring for adjusting canine axis inclination, and relates to the technical field of orthodontics, the novel long-arm positive-axis spring comprises a connecting arm, a force application arm, a sliding arm and an elastic force storage part, the two ends of the connecting arm are connected with the force application arm and the sliding arm through the elastic force storage part respectively, and the elastic force storage part is connected with the connecting arm. And a hook is arranged at one end, far away from the elastic force storage part, of the sliding arm. According to the orthodontic appliance, canine teeth can be controlled to incline in the required direction, the force application size and direction of the orthodontic appliance are controllable, the teeth can be efficiently aligned while comfort is considered, the orthodontic materials are easy to obtain, manufacturing is easy and convenient, and the orthodontic appliance can be widely applied and popularized.

The invention discloses a micro-vibration conversion and transmission structure and a micro-vibration generation device.The micro-vibration conversion and transmission structure comprises a cross beam, a bearing, a blocking piece, a support and a mass block, the bearing comprises a knife edge and a knife bearing, the cross beam and the knife edge are fixedly installed, and vibration transmission is achieved through left-right swinging of the knife edge on the knife bearing; the cross beam is an unequal-proportion lever and comprises a long arm and a short arm, and equal-proportion reduction conversion of vibration signals can be achieved through the arm length proportion of the long arm and the short arm; the separation blade is used for vertically supporting and constraining the transverse movement of the cross beam; a cutter bearing of the support is fixedly mounted on the support, and a mass block is fixedly mounted on the cross beam and used for adjusting the height of the gravity center of the micro-vibration conversion and transmission structure; a threaded hole in the end of the long arm is connected with a vibration excitation source, and a threaded hole in the end of the short arm is provided with a micro-vibration sensor. The vibration magnitude of an existing excitation system can be reduced according to a certain proportion and then converted into a micro-vibration signal, and the calibration requirement of a micro-vibration sensor under the low-frequency micro-vibration magnitude is met.

The application relates to an automatic guiding deviation rectifying device, and relates to the field of modern automobile industrial production and manufacturing. The device comprises a deviation rectifying mechanism and a return mechanism. The deviation rectifying mechanism comprises a rotating arm, the rotating arm comprises a long arm and a short arm used for driving the long arm to be lifted after the long arm is driven to descend when the plate contacts the front end of the long arm, the front ends of the long arm and the short arm are upwardly arranged and are mutually angled, a rotating pin is arranged in the middle of the rotating arm so as to divide the rotating arm into the long arm and the short arm, and the return mechanism comprises an elastic component used for descending the short arm to return when the plate leaves the long arm. The rotating pin and the deviation rectifying mechanism are adopted to rectify the plate through the tilting and rotating mode. The deviation rectifying device has the advantages of strong deviation rectifying capacity, high efficiency, large deviation rectifying range, larger deviation rectifying moving distance compared with the existing deviation rectifying mechanism, small friction force generated during deviation rectification, and difficulty in being stuck during the deviation rectification of the plate.

The application discloses a variable wheel suitable for complex driving road surfaces, the spoke of the variable wheel comprises three spoke plates of adult letter-shaped structure; the wheel leg is in circular arc structure and corresponds to the spoke plate one by one; the duct is provided with a web; the rotor is coaxially installed in the duct; the Z-shaped component comprises a long arm, a fixed shaft and a short arm; one end of the fixed shaft is rotationally connected with the long arm, and the other end is rotationally connected with the short arm; the roller at the outer end of the long arm is rollingly matched in the groove, and the rollers at both ends of the roller are slidingly matched with the guide rail groove; the traction rod is rotationally connected with the short arm; the driving disc is connected with the traction rod; the first driving shaft is fixedly connected with the rotor in concentricity; the second driving shaft is fixedly connected with the driving disc in concentricity; and the third driving shaft is fixedly connected with the spoke in concentricity. The variable wheel has simple structure, good stability and can realize wheel type, leg type and duct rotor type.

The utility model discloses a stable folding boom easy to operate, which relates to the technical field of mining equipment and comprises a connecting unit, a first adjusting unit and a second adjusting unit, the first adjusting unit and the second adjusting unit are arranged above the connecting unit, and the second adjusting unit is positioned on the side of the first adjusting unit. The first adjusting unit comprises a U-shaped base installed on the top of the connecting unit, a first-stage arm movably installed on the top of the U-shaped base, and a first adjusting piece arranged between the U-shaped base and the first-stage arm. According to the stable folding arm support easy to operate, due to the arrangement of the first adjusting unit and the second adjusting unit, the long arm support can keep high stability in the working state, and the shaking phenomenon caused by a long arm is reduced.