383 results about "Spherical joint" patented technology

The invention relates to an end executive device for picking mushrooms. The end executive device solves the technical problem of how to more effectively and reliably pick agaricus bisporus growing obliquely. The device comprises an upper supporting plate, a lower supporting plate, a fixing column, a rotation driving mechanism, a flexible pipe, a lower rigid air pipe, a spherical joint bearing, a suction cup, an upper hollow shaft, a first bearing and a spring, the upper hollow shaft is rotationally connected with the upper supporting plate through the first bearing, and the upper end of the flexible pipe is connected with the lower end of the upper hollow shaft; the lower end of the flexible pipe is connected with the upper end of the lower rigid air pipe, the upper end of the spring is connected with the lower end of the upper hollow shaft, the lower end of the spring is connected with the upper end of the lower rigid air pipe, the flexible pipe is sleeved with the spring, the spherical joint bearing is connected with the lower supporting plate, and the lower rigid air pipe is connected with an inner ring of the spherical joint bearing. The lower rigid air pipe penetrates through the spherical joint bearing, and the sucker is connected with the lower end of the lower rigid air pipe. The mushroom picking machine is widely used for picking mushrooms such as agaricus bisporus.

The invention relates to the field of aero-engines, in particular to a fan stationary blade retaining structure of an open rotor engine. The fan stationary blade retaining structure is positioned between the fan blade handle and the stationary blade hub and comprises a magnetic suspension spherical joint; the magnetic suspension spherical joint comprises a spherical joint inner shell, a spherical joint outer shell, a limiting structure and an electromagnetic force adjusting device. The tail end of a blade handle of the fan stationary blade is fixedly connected with a spherical joint inner shell of the magnetic suspension spherical joint, and a spherical joint outer shell is installed in a corresponding installation cavity in the stationary blade hub and then fixed to the intermediate case. The limiting structure is arranged between the spherical joint inner shell and the spherical joint outer shell along the axis of the blade handle, and a local mechanical weak part is arranged on the limiting structure. The limiting structure between the spherical joint inner shell and the spherical joint outer shell can decouple the fan stationary blade and the intermediate case, impact and vibration loads transmitted to the intermediate case are reduced, and it is guaranteed that the intermediate case still has enough structural safety after being subjected to large impact loads.

The invention provides a steel net rack platform integral installation type offshore photovoltaic supporting structure, a net rack platform is arranged on a pile foundation structure, the net rack platform is provided with an upper plane frame and a lower plane frame in a layered manner, and the surface of the upper plane frame is connected with a photovoltaic module; the upper plane frame comprises upper chord members which are connected with each other, the lower plane frame comprises lower chord members which are connected with each other, the upper chord members are connected through ball joints, the lower chord members are connected through ball joints, and inclined rods are connected between the ball joints of the upper plane frame and the ball joints of the lower plane frame. Connecting sections are arranged at the end parts of the chord members, the lower chord members and the inclined rods; and connecting parts matched with the connecting sections are arranged in the spherical joints. The rod pieces in the net rack platform are connected through the ball joints and are in threaded connection together to form the net rack platform, the net rack platform does not need to be welded, the length of the bolts can be adjusted, and therefore the net rack platform is convenient and rapid to assemble.

The invention discloses a composite type four-foot wall climbing robot integrating a fish suction cup adsorption mechanism and lizard crawling characteristics. The problems that a traditional wall climbing robot is poor in adsorption stability and insufficient in moving flexibility on uneven and wet wall surfaces are solved. The core structure of the robot comprises an adsorption sole assembly, a multi-degree-of-freedom leg joint, a bionic spine, a micro air pump and a sole pressure sensor, and the adsorption sole assembly controls an air bag through the air pump to generate negative pressure to adapt to various wall surfaces; multiple joints of the legs are matched with the spherical joints to achieve multi-angle attachment of the foot sole, the bionic spine can be bent and buffered, lizard diagonal gaits are adopted, the rotation angle of the joints is adjusted in combination with a sensor, self-adaptive movement on the wall with the inclination angle ranging from 0 degree to 90 degrees is achieved, and the efficiency is improved by 30% or above compared with a traditional robot. The robot breaks through the limitation of a single bionic mechanism, can be applied to complex high-altitude scenes such as building outer wall detection, and reduces the manual operation risk.

The angle-adjustable underwater well mouth comprises a high-pressure well mouth, a low-pressure well mouth and a low-pressure well mouth extension sleeve, the high-pressure well mouth and the low-pressure well mouth are positioned and adjusted in direction through a first well mouth spherical pair, and the high-pressure well mouth and the low-pressure well mouth are locked through a locking ring; in the tie-back operation mode, a high-pressure well mouth is connected with a flexible insertion sealing pipe through a high-pressure well mouth thin-wall extension sleeve, a tie-back tail pipe hanger is arranged in a low-pressure well mouth extension sleeve, a guide cylinder is arranged at the upper end of the tie-back tail pipe hanger, and a guide head is arranged at the lower end of the flexible insertion sealing pipe. The flexible insertion sealing pipe can enter the tie-back tail pipe hanger under the guiding action of the guiding head and the guiding cylinder; in the non-tie-back operation mode, the common extension sleeve is connected below the high-pressure wellhead, and the sleeve string is connected below the common extension sleeve. The inclined high-pressure wellhead is adjusted to be approximately vertical as required, so that a service tool, a blowout preventer and a Christmas tree are convenient to mount, the stability of the wellhead is enhanced, and the operation risk is reduced.

A spherical joint couples an accessory to a support. The spherical joint enables the accessory to be leveled about one or more axes and panned about an axis, such that the accessory may be leveled and panned with respect to a viewing sphere. The spherical joint comprises a collar, a cup, and a ball head, wherein the collar is configured to house the ball head and the ball head is configured to couple to one of an accessory or a support via a mount interface. The ball head further comprises a ball configured to enable rotation of the ball head relative to the collar with respect to one or more axes. The cup is configured to resist rotation of the ball head relative to the collar, such that the spherical joint may be fixed at a suitable orientation.

The invention provides a thyroid postoperative rehabilitation training neck support which comprises a fixator, a neck support body connected through an elastic band is arranged on the fixator, a sliding rail is arranged on the neck support body, connecting blocks are arranged at the two ends of the sliding rail in a sliding mode, a sliding block is arranged in the middle area of the sliding rail in a sliding mode, and two resistance assemblies are arranged on the neck support body. The fixing device is provided with an adjusting mechanism, the fixing device further comprises a connecting cylinder connected with the fixing device through a spherical joint assembly, the connecting cylinder is sleeved with the sliding block in a sliding mode, and the connecting cylinder is provided with a locking mechanism. By means of the rehabilitation training neck support, movement of the neck in multiple directions can be adjusted, after training is completed, the relative positions of the neck support body, the sliding block and the fixator can be rapidly fixed through the locking mechanism so that the neck of a patient can be supported, and compared with a traditional rehabilitation training neck support, the rehabilitation training neck support is wider in application range, more comprehensive in training and higher in practicability. The postoperative rehabilitation efficiency is effectively improved.

An adjustable ball joint which is infinitesimally adjustable using a jam nut wherein no set screws are used. A kit for constructing an adjustable ball joint which is infinitesimally adjustable using a jam nut wherein no set screws are used. A method of assembling an adjustable ball joint which is infinitesimally adjustable using a jam nut wherein no set screws are used.

The utility model relates to the technical field of construction of a steel grid structure, in particular to a spherical connecting joint of the steel grid structure, and particularly relates to a bolt connection type hollow spherical joint for the steel grid structure. Comprising a hollow foundation ball body, holes are formed in the surface of the foundation ball body, and the holes are used for being connected with chord members (3) or web members (4) through bolt and nut assemblies. The net rack is connected with the rod piece through bolts, the defects of an existing welding ball joint and an existing bolt ball joint net rack are overcome, operation is easy, and on-site assembly type connection of the net rack can be achieved.

A faucet extender has a universal joint and a water outlet device. The universal joint has a connecting base and a water outlet base. The connecting base has a lower connecting hole. The water outlet base has an installing part and a spherical joint. The installing part has an installing space, an installing hole and a through-hole. The installing hole and the through-hole connect two ends of the installing space. A flow channel is through the spherical joint and connects the through-hole. An end of the spherical joint is rotatably mounted in the connecting base and protrudes from the lower connecting hole. Another end of the spherical joint is mounted on the installing part. The water outlet device is mounted in the installing hole. In addition to the original downward water outlet direction of the faucet, the water outlet direction can be adjusted via rotating the water outlet base.

The invention discloses welding equipment for furnace end production based on plasma, and relates to the technical field of plasma welding, the welding equipment comprises a machine body, a workbench and a welding mechanism, the machine body is provided with a horizontal module, the horizontal module is provided with a lifting module, and the lifting module is connected with the workbench; compared with existing welding equipment for furnace end production, the sealing mechanism is arranged, the sealing mechanism is composed of the sealing cover, the movable plate and other components, on one hand, waste gas is prevented from flowing into the external environment, and on the other hand, interference of external factors to the welding process is reduced; the distance between the spherical joint and the axis of the sealing cover can be adjusted at any time, so that the sealing mechanism can be normally used when the plasma welding head is used for welding furnace end main bodies and furnace end lining covers with different sizes; through cooperation of the clamping assembly and the supporting assembly, furnace end bodies of different sizes can be horizontally fixed.

The invention relates to the field of net rack welding, in particular to a net rack structure lower chord ball joint welding device which comprises a welding table, an arc-shaped positioning groove used for containing a ball joint is formed in the upper end of the welding table in a penetrating mode, and the ball joint can transversely and longitudinally rotate in the arc-shaped positioning groove to adjust the welding point position. A receding opening is formed in the side plate in a penetrating mode, an angle adjusting clamping mechanism is arranged on the side plate, the angle adjusting clamping mechanism comprises a bearing plate, clamping arc plates are rotationally installed on the two sides of the bearing plate and used for clamping and fixing the rod piece, and one end of the bottom of the bearing plate is rotationally matched with the movable plate. The deflection motor is used for driving the welding gun to swing so that the welding gun can be accurately aligned with the joint position of the rod piece and the ball joint, the mounting plate is matched to drive the welding gun to crawl along the welding support, the continuous annular automatic welding process can be conducted around the rod piece, and the welding quality and the welding efficiency can be improved.

The invention discloses a multi-cabin type pipeline interior detection robot with spherical joints and a detection method, and solves the technical problems that a traditional pipeline detection robot is difficult to pass in a complex structure and low in detection precision and maintenance efficiency. Comprising a control cabin, a power supply cabin and a detection cabin which are connected through spherical joints; the control cabin comprises a main control module, a communication module and a visual module, the power supply cabin comprises a battery and a power supply module, and the detection cabin comprises a sensor module; the spherical joint comprises a double-servo driving system, the double-servo driving system comprises a pitching motor and a heading motor which are orthogonally arranged, and the pitching motor and the heading motor respectively drive the spherical joint to rotate in the vertical direction and the horizontal direction through a reduction gear set so as to realize multi-degree-of-freedom posture adjustment among the cabins. The multi-degree-of-freedom posture adjustment of the detection robot is achieved, and the robot can flexibly adapt to complex structures such as three-way pipelines, Y-shaped branches and sharp turns.

The invention provides a three-degree-of-freedom spherical joint motor module applied to a humanoid robot, and belongs to the field of humanoid robots. The three-degree-of-freedom spherical joint motor module comprises a sphere, a first permanent magnet direct current brushless motor, a second permanent magnet direct current brushless motor and a third permanent magnet direct current brushless motor; wherein the first permanent magnet direct current brushless motor and the second permanent magnet direct current brushless motor are located on the outer surface of the ball body and are arranged at an angle of 90 degrees in space, and the first permanent magnet direct current brushless motor is used for achieving rotation of the ball body around the X axis; the second permanent magnet direct current brushless motor is used for realizing rotation of the sphere around the Y axis; the third permanent magnet brushless direct current motor drives the first permanent magnet brushless direct current motor, the second permanent magnet brushless direct current motor and the sphere to rotate around the Z axis as a whole. The spherical joint motor module realizes 360-degree rotation of each motor around the respective rotating shaft, remarkably expands the movement range of the sphere, and has the advantages of compact structure, high space utilization rate and the like.

The utility model relates to the technical field of expansion bolts, in particular to an expansion bolt with an auxiliary installation structure, which comprises a countersunk bolt, an expansion tube, a flat gasket, an elastic gasket and a nut, an expansion groove is arranged at the bottom of the side end face of the expansion tube, the countersunk bolt consists of an expansion rod and a screw rod, and an expansion ball head is arranged at the bottom of the expansion rod. A spherical groove is formed in the top of the expansion rod, a spherical joint is arranged at the bottom of the lead screw, and the lead screw and the expansion rod are rotationally connected through matching of the spherical joint and the spherical groove. According to the expansion bolt, the screw rod and the expansion rod are rotationally connected, so that the screw rod and the expansion rod can be stretched at a certain included angle, the expansion pipe is attached to the preset hole, the screw rod is perpendicular to the vertical face of equipment, the nut is attached to the vertical face in parallel, and the stability of the expansion bolt is greatly improved; through cooperation of the spherical joint and the spherical groove which are rotationally connected in a damping mode, the lead screw is prevented from sliding excessively, and convenience of lead screw installation is guaranteed.

The invention discloses a ring rib sleeve and elastic device collaborative assembly type hollow sphere joint and a reinforcing method, and belongs to the technical field of steel structure reinforcing. The invention innovatively provides a reinforcing system composed of a node area ring sleeve assembly, a rod piece rib ring sleeve assembly, an elastic connecting device and a high-strength bolt. The joint area rib ring sleeve is designed in a split mode, a closed ring rib-shaped sleeve is formed through opposite penetrating connection of high-strength bolts, and the joint of a joint and a rod piece is accurately wrapped with the closed ring rib-shaped sleeve. The rod piece rib ring sleeve also adopts a split type design, forms a ring rib-shaped sleeve through high-strength bolt connection, and forms a continuous force transmission path with the node area sleeve through flange connection; the elastic connecting device adopts a prestress loading mechanism, continuous pressing of a node contact face is achieved through a belleville spring set, an adjustable elastic constraint interface is formed, the node stress distribution state is effectively improved, and dynamic displacement is absorbed. The method is particularly suitable for performance improvement and reconstruction engineering of spherical nodes in a large-span space structure.

The utility model relates to an end executive device capable of being used for picking mushrooms. The end executive device solves the technical problem of how to more effectively and reliably pick agaricus bisporus growing in an inclined mode. The device comprises an upper supporting plate, a lower supporting plate, a flexible pipe, an upper hollow shaft, a lower rigid air pipe, a spherical joint bearing and a self-adaptive suction cup, the upper supporting plate is connected with the lower supporting plate through a fixing column, the upper hollow shaft is fixedly connected with the upper supporting plate and penetrates through the upper supporting plate, the upper end of the flexible pipe is connected with the lower end of the upper hollow shaft, and the lower end of the flexible pipe is connected with the lower rigid air pipe. The lower end of the flexible pipe is connected with the upper end of the lower rigid air pipe; the spherical joint bearing is connected with the lower supporting plate, the spherical joint bearing is provided with an inner ring, the lower rigid air pipe is connected with the inner ring of the spherical joint bearing, and the lower rigid air pipe penetrates through the spherical joint bearing; the self-adaptive suction cup is connected with the lower end of the lower rigid air pipe. The mushroom picking machine is widely used for picking mushrooms such as agaricus bisporus.

The present invention discloses an intelligent surgical exoscopic system, comprising a work trolley, a pneumatic robotic arm, an intelligent multi-optical imaging system located at the end of the pneumatic robotic arm, a 3D display device, and auxiliary control equipment; the work trolley comprises a housing, a display rotating bracket, a four-star base, and universal casters; the pneumatic robotic arm comprises a pneumatic mechanical arm, a pneumatic mechanical arm, a pneumatic camera arm, and a spherical joint; the intelligent multi-optical imaging system comprises multiple integrated zoom imaging optical paths, an intelligent focus controller, and a ring integrated chip; the 3D display device comprises a polarized 3D main screen, a polarized 3D secondary screen, and a head-mounted display device; the head-mounted display device comprises VR glasses and AR glasses; and the auxiliary control device comprises a pressure-sensitive foot pedal. The present invention meets the needs of modern surgical operations, providing more intelligent services, more efficient signal transmission, and a more comfortable user experience.

Provided is a method and apparatus for refining a ball joint stud. The method includes receiving and releasably securing the ball joint stud in a holder between a first die and a second die. The method further includes translating one or more of the first die and the second die towards the remaining die to apply a compression pressure to the ball joint stud. The compression pressure causes a plastic radial compression of the ball joint stud to a stroke length. The stroke length may be to induce a residual stress in the ball joint stud or increase a surface hardness of the ball joint stud. The first die and second die each include a contact surface configured to interface with the ball joint stud. The method may further include rotating one or more of the first die and the second die during the application of the compression pressure.

The utility model belongs to the technical field of automotive suspensions, in particular to a suspension connecting mechanism for an endurance test of an automotive suspension, which comprises a sensor mounting seat and a spherical joint, a tension and pressure sensor is fixedly arranged at the top of the sensor mounting seat, and a fixing structure is fixedly arranged at the bottom of the sensor mounting seat. A joint bearing is arranged in the fixing structure, a wheel support adapter is arranged at the top of the spherical joint, an adjusting structure is arranged between the spherical joint and the tension and pressure sensor, the fixing structure comprises an upper mounting frame and a lower mounting frame, the upper mounting frame is fixedly connected with the bottom of the sensor mounting seat, and the lower mounting frame is fixedly connected with the bottom of the sensor mounting seat. By arranging the upper mounting frame, the limiting frame, the through hole, the inserting rods and the first spring, when the knuckle bearing is damaged and needs to be replaced, the two inserting rods are pulled outwards at the same time, after one end of each inserting rod is separated from the inserting hole in the inserting plate, the upper mounting frame and the lower mounting frame can be separated, the knuckle bearing is taken out and replaced independently, and the use cost of equipment can be reduced.

The invention discloses an AI intelligent movable type surgical affected limb lifting auxiliary device and a control method, and relates to the field of technical intelligent medical equipment.The AI intelligent movable type surgical affected limb lifting auxiliary device comprises a movable base, a rotating base is installed in the middle of the movable base, and the lower portion of the rotating base is fixedly installed on a top shell of the movable base; the four-degree-of-freedom mechanical arm is installed on the upper portion of the rotating base, the four-degree-of-freedom mechanical arm is connected with the movable base through the rotating base, and the four-degree-of-freedom mechanical arm is composed of a large mechanical arm, a small mechanical arm, a spherical joint, a telescopic sliding rail, a servo motor and a hydraulic cylinder. By installing the four-degree-of-freedom mechanical arm, the function of accurately lifting an affected limb is achieved, the four-degree-of-freedom mechanical arm has extremely high movement precision and bearing capacity, the affected limb can be rapidly and accurately positioned and maintained in the optimal posture needed by an operation, and fatigue errors caused by manual lifting are avoided.

The utility model discloses a gripper for a gantry type three-point floating clamp, which comprises a push-pull rod connected with a telescopic rod of a hydraulic cylinder, the lower end of the push-pull rod is rotatably connected with a three-point floating pressing plate, and a clamping nail is mounted at the bottom of the three-point floating pressing plate. The push-pull rod comprises a push-pull rod body, a connecting rod and a hemispherical connector which are coaxially arranged, a hemispherical inner cavity is formed in the upper surface of the three-point floating pressing plate, the hemispherical connector is installed in the hemispherical inner cavity, the push-pull rod is sleeved with a cylindrical silica gel sleeve, the bottom of the silica gel sleeve makes contact with the upper surface of the three-point floating pressing plate, and the bottom of the silica gel sleeve makes contact with the upper surface of the three-point floating pressing plate. A plurality of big-end-up liquid drainage through holes are formed in the three-point floating pressing plate, the top ends of the liquid drainage through holes penetrate through the bottom face of the hemispherical inner cavity, and the bottom ends of the liquid drainage through holes penetrate through the side wall of the three-point floating pressing plate. And the clamping quality is guaranteed, and the part machining yield is improved.

The present invention discloses a multi-platform composite series-parallel closed-loop motion mechanism, which includes 3 motion platforms, 9 telescopic motion chains, 12 Hooke joints and 6 spherical joints. The mechanism has multiple levels of motion platforms, which can carry multiple levels of optical devices or other devices, reduce space in a series optical system that requires it, and achieve control for each level; this composite series-parallel motion mechanism is formed by closing and connecting in series a 6-UPS and a 3-UPU type (this part is located inside the mechanism as a whole), and is an inner full-rank or redundant inner closed-loop series-parallel platform, where any one of the 3 platforms is a static platform, and the other two are a 6-degree-of-freedom moving platform and a 3-degree-of-freedom moving platform. This multi-platform composite series-parallel closed-loop motion mechanism adopts a structural form of two levels of motion platforms, realizes the integration of series and parallel in the overall structure, combines the advantages of both series mechanisms and parallel mechanisms, has a larger motion stroke range, higher precision, is structurally compact, and has a small volume, etc.

To provide a polishing machine which can perform polishing to a needed portion of a workpiece to attain highly accurate flatness regardless of the worker's skill level.SOLUTION: A polishing machine includes: a motor provided within a main part 10; a polishing part 40 which is rotated by a motor to polish a surface of a workpiece; and a universal joint 24 and a ball joint 30 which transmit rotation of the motor to the polishing part 40. The universal joint 24 and the ball joint 30 transmit rotation of the motor to the polishing part 40, regardless of an inclination of a rotation axis of the motor relative to a rotation axis of the polishing part 40.SELECTED DRAWING: Figure 3

The application discloses a kind of tobacco box transport devices, comprising: transport car body, two pairs of universal wheels are arranged below the transport car body, to realize the steering and movement of transport car body;Rocker arm, one is arranged in the both sides of transport car body, one end of rocker arm is movably connected with a electric cylinder by spherical joint, the up-and-down swing of rocker arm is driven by the extension and contraction of electric cylinder, and electric cylinder is fixed on transport car body by spherical joint;The other end of rocker arm is linked with clamping arm, and the clamping parts of clamping arm on both sides are oppositely arranged to form the clamping space of clamping tobacco box;Pneumatic link mechanism, when cylinder extends, the distance between clamping arms is reduced to tightly hold tobacco box, and vice versa to release.The whole structure of the application is compact, can complete the taking and placing of tobacco box at different heights, freely move in the narrow environment carrying tobacco box, and also can realize material shoveling and dumping by vehicle movement and clamping cradle overturning.

The invention relates to an assembly comprising a blade holder cartridge (15); a shaving head (1), equipped with a magnetic suspension consisting of pairs of magnets (2, 4) and (5, 3) in an attractive position; and a handle (16) assembled to said head by means of a joint composed of a cup (20) and a ball joint (25) having pairs of connecting magnets (21, 22) and (23, 24) in a repulsive position. Shaving is performed using shaving blades (13, 14), positioned in the blade holder cartridge (15), which bear against the magnets (4, 5) that exert pressure on them to ensure a comfortable shave. This pressure can be adjusted using the dials (8, 9) associated with the screw rods (6, 7).

The invention discloses a normal-temperature and high-temperature wall surface static pressure measurement integrated assembly which comprises a static pressure measurement integrated assembly body capable of introducing normal-temperature or high-temperature airflow without causing blockage of a pressure guide pipe. The pressure guide pipe and the spherical joint are hermetically welded through the metal welding layer, and the spherical joint and the conical horn mouth of the pressure guide hole in the static pressure measuring seat form linear sealing, so that the problem that colloid melts and flows into the pressure guide pipe to cause blockage is solved when high temperature of introduced high-temperature airflow occurs.

A spherical joint couples an accessory to a support. The spherical joint enables the accessory to be leveled about one or more axes and panned about an axis, such that the accessory may be leveled and panned with respect to a viewing sphere. The spherical joint comprises a collar, a cup, and a ball head, wherein the collar is configured to house the ball head and the ball head is configured to couple to one of an accessory or a support via a mount interface. The ball head further comprises a ball configured to enable rotation of the ball head relative to the collar with respect to one or more axes. The cup is configured to resist rotation of the ball head relative to the collar, such that the spherical joint may be fixed at a suitable orientation.

A round sand crushing and shaping machine comprises a box body, a rotating shaft is rotationally arranged in the box body, a grinding assembly for grinding sand is arranged between the rotating shaft and the box body, the periphery of the rotating shaft is sleeved with a screen drum for screening the sand, the diameters of the two ends of the screen drum are different, and the opening end with the smaller diameter of the screen drum is arranged at a discharging port of the grinding assembly in a sleeving mode. A plurality of elastic telescopic rods are installed between the two sides in the screen drum and the rotating shaft, one ends of the elastic telescopic rods are in ball joint with the rotating shaft, the other ends of the elastic telescopic rods are in ball joint with the screen drum, and the elastic coefficient of the elastic telescopic rods close to the small-diameter opening end of the screen drum is smaller than that of the elastic telescopic rods close to the large-diameter opening end of the screen drum. When the flow of materials entering the screen drum is increased, the screen drum drives the elastic telescopic rod close to the opening end with the smaller diameter of the screen drum to deform more greatly under the action of the gravity of the materials, so that the inclination angle of the screen drum is adjusted. Fine powder in the sand is prevented from being discharged from the screen drum without being fully screened when the flow is suddenly increased, and the stability of the screening effect is kept.

The utility model discloses a multi-ball-joint joint, a supporting arm and a fixing device. The multi-ball-joint joint comprises a joint frame capable of adjusting clamping force, a first ball and a second ball, the first ball and the second ball are rotationally arranged in the joint frame, and the first ball and the second ball are fixedly connected with a connecting shaft and a connecting sleeve respectively. The single multi-ball-joint joint provided by the utility model has adjustable static supporting force and six degrees of freedom including axial rotation and radial deflection, and can meet the requirements of multi-angle and multi-direction adjustment. Meanwhile, the double-ball-joint structure is adopted, various deflection schemes can be allowed to be achieved at the same deflection angle, and the diversity of angle-adjustable implementation schemes is further improved.