59 results about "Friction effect" patented technology

The invention relates to the technical field of grinding equipment, in particular to a wind power flange edge hole grinding device which comprises a base, a plurality of stand columns are fixed to the top of the base, a supporting disc is fixed to the tops of the stand columns, a positioning mechanism is arranged at the top of the supporting disc and used for positioning a flange, and a plurality of spherical grooves are formed in the supporting disc. Balls are slidably connected to the interiors of the spherical groove bodies, the balls protrude out of the upper surface of the supporting disc, the balls are connected with locking mechanisms, and after the flange is positioned, the locking mechanisms are used for fixing the balls; the innovative design of the balls and the locking mechanism is adopted, the spherical grooves formed in the supporting disc are matched with the balls, low-friction flexible supporting is achieved in the positioning stage, the positioning efficiency is greatly improved, meanwhile, direct contact between the wind power flange and the supporting disc can be avoided, damage to the wind power flange due to the friction effect can be avoided, and the service life of the wind power flange is prolonged. And the flange reference surface precision is protected.

The invention relates to the technical field of rock mechanics true triaxial tests, in particular to a rock cylinder sample true triaxial test analysis method which comprises the following steps: applying a point load to the cylindrical surface of a cylinder sample, performing integration by using a linear superposition principle, and calculating an analytical solution of an internal stress field in the circular surface of the rock cylinder sample; applying a symmetry plane load to the cylindrical surface of the cylinder sample, and calculating an internal stress field of the circular surface of the cylinder sample under the symmetry plane load by using an analytical solution; setting a constraint condition of a stress state similar region, calculating a relation function between symmetrical surface loads in a corresponding loading mode, and determining the relation function as a linear gradient loading mode; and performing finite element analysis on the cylindrical sample of the rock, and verifying the feasibility of the linear gradient loading mode determined by the analytical solution. According to the invention, true triaxial test analysis of the cylinder sample is realized, the internal stress state of a larger area of the sample is ensured to be similar, and the problems of boundary effect, friction effect, fluid channeling and the like of a cubic sample are avoided.

The cold rolling device comprises a conveying table, a plurality of conveying rollers are movably connected into the conveying table, the upper side and the lower side of the middle of the conveying table are each movably connected with a cold rolling roller, a workpiece is movably placed on the conveying rollers, a support is fixedly installed on the right side of the upper end of the conveying table, and a plurality of cold rolling rollers are fixedly installed on the support. And the lower end of the adjusting mechanism is movably connected with a frosted plate. The problem that the cold rolling quality is affected due to the fact that impurities are attached to the cold rolling roller is solved. According to the technical scheme, the cold rolling device for the clothes hanger supporting piece is provided. When the frosted plate is in contact with the cold roll, a strong friction effect is generated between the frosted plate and the cold roll due to the rotation of the cold roll. Dirt and metal impurities on the surface of the cold roll can be removed through friction, the surface quality of rolled products can be remarkably improved by cleaning the metal impurities on the cold roll, the defects such as scratches and indentations caused by impurity attachment are reduced, and the appearance and performance of the products are improved.

The invention discloses an electromechanical multi-professional module integral lifting device and a construction method, and belongs to the field of lifting devices. The electromechanical multi-professional module integral lifting device comprises a moving seat, positioning frames are fixedly connected to the two sides of the top of the moving seat, the electromechanical multi-professional module integral lifting device further comprises a bearing bracket vertically sliding along the positioning frames, a lifting assembly is arranged on the moving seat, and the lifting assembly is used for pulling the bearing bracket to vertically slide along the positioning frames; the positioning block is fixed at the bottom of the movable seat, and the two sides of the positioning block are rotationally connected with movable wheels; through the repulsion effect of a magnetic plate and a piston plate and the arrangement of a first spring, circulating spraying of a lubricating agent is achieved, the friction effect borne by the lifting cable is reduced, the durability of the lifting cable is improved, the lifting safety is ensured, meanwhile, the situation that pollution is caused by dripping of excessive lubricating agent is avoided, recycling of the excessive lubricating agent is achieved, and the cost is reduced. The loss of the lubricant is effectively reduced, and the energy-saving effect is improved.

The utility model relates to a paint coating mould technical field proposes a kind of paint coating mould automatic aligning device, including frame body: the inside sliding connection of frame body has adjusting slider one, the side fixedly connected with pneumatic telescopic link of adjusting slider one, the extension end fixedly connected with fixed block of pneumatic telescopic link, the inside fixedly connected with motor two of fixed block, the output fixedly connected with rotating round plate of motor two, the rotation of rotating round plate can be realized by the motor two of being set, to be able to realize the rotation of positioning sleeve and threading block under the friction effect of antiskid ring one and antiskid ring two, further realize the rotation of threading body, the rotation of threading body can be limited in fixed position by the L-shaped limit rod and limit turntable of being set, the extension of threading body distance can be realized by telescopic pneumatic telescopic link.

Torsional vibration damper (10) for reducing torsional vibrations, comprising a first damper element (16) rotatable about a rotation axis (14) with a cover element (20), at least one spring element (24), a second damper element (28) which is rotatable about the axis of rotation (14) and which can be rotated to a limited extent relative to the first damper element (16) against the action of the spring element (24), an output component (44) which is coupled to the second damper element (28) in a rotationally fixed manner and which outputs a torque transmitted via the spring element (24) and the second damper element (28), a friction element (50) acting as a friction between the first damper element (16) and the second damper element (28), an axial spring element (48) fastened to the second damper element (28) and designed as a disc spring membrane, wherein the friction element (50) is subjected to an axial force (52) of the axial spring element (48) acting in the direction of the cover element (20), and wherein the friction element (50) is frictionally rotatable relative to the first damper element (16) to form a friction region (56) and is directly connected to the output component (44) in a rotationally fixed manner such that a first form-locking element (68) of the friction element (50) is connected to a second form-locking element (70) on the output component (44) in a form-locking manner, characterized in that the first form-locking element (68) extends radially inside the cover element (20), and in that the second form-locking element (70) is designed as a circumferential recess (72) on an outer circumference of the output component (44), wherein the circumferential recess (72) is arranged radially inside the cover element (20) and axially overlapping the cover element (20), and in that the friction element (50) has a radial section (62) from which the first form-locking element (68) extends axially away, wherein the first form-locking element (68) extends from the radial section (62) radially inside the cover element (20) in the axial direction and is designed as a circumferentially delimited projection (76).

The utility model discloses a deviation correction device of a conveying belt, which relates to the field of glass bottle production and is technically characterized by comprising a conveying frame, two conveying rollers are arranged in the conveying frame, the conveying rollers are sleeved with the conveying belt, and limiting rings are arranged on two sides of each conveying roller. And a plurality of correction bottom plates are arranged at the top of the conveying frame, so that the problems that under the condition of heavy load, the friction force between the conveying belt and the limiting rings is increased, the surfaces of the limiting rings are abraded and even possibly damaged due to the long-term friction effect, and the conveying belt is damaged due to the friction force between the conveying belt and the limiting rings are solved. The technical problems that due to the fact that the limiting ring loses the limiting effect, a conveying belt deviates from a preset track in the operation process, glass bottles incline or turn over in the conveying process due to deviation of the conveying belt, and the risk of bottle breaking is increased are solved.

According to the method for testing the effective prestress of the existing concrete structure considering the reverse friction influence, a plurality of prestressed tendons are pre-buried in concrete to form an in-service prestressed concrete member, and one prestressed tendon at the end part of the concrete is stretched by using a supplementary tensioning tool; in the stretching process, the obtained stretching stress of the prestressed tendon, the corresponding stretching length measured from the failure of friction constraint between an anchorage device and a wedge-shaped clamping piece of the prestressed tendon and the effective stress of the in-service prestressed concrete member are recorded for at least five times, and the obtained stretching stress and the corresponding stretching length are the secondary reverse friction force influence stress; selecting the friction coefficient of local deviation of the length per meter in the pore channel and the friction coefficient between the prestressed tendon and the wall of the pore channel from the anti-friction influence length corresponding to the anti-friction influence stress; finding out an optimal one; and calculating the effective stress of the out-service prestressed concrete member by using any recorded tensile length.

The utility model discloses a kind of pipe material segmented lifting equipment, belong to hoist technical field, its technical scheme main point is: including bunker, hoist and slide, bunker is used to accommodate pipe material, hoist is set in bunker, hoist is used to lift pipe material, slide is obliquely set in bunker, slide is used to guide pipe material in bunker to hoist, further include segmented device, segmented device is located in bunker, segmented device is used to limit the pipe material of bunker bottom to make it away from hoist, when the pipe material in bunker is below certain height, segmented device removes the restriction of pipe material at the bottom of bunker to make pipe material along slide close hoist, this lifting equipment is by segmented lifting pipe material, can effectively reduce mutual collision interference between pipe material, make pipe material keep relatively orderly distribution state, reduce the possibility of cross inclination, and extrusion friction effect between pipe material is weakened, reduce the risk of jamming and damage when feeding.

The present application relates to a kind of powder processing device and method for improving powder sphericity and surface finish, including processing cylinder and multiple rotating mechanism, lower rotating mechanism includes stirring blade, can be rotated in positive direction, upper rotating mechanism includes shaping blade, can be rotated in positive direction or reverse direction.The stirring blade of lower rotating mechanism is a certain obtuse angle with the direction of rotation, can better lift up powder, the shaping blade of upper rotating mechanism includes two inclined planes of positive and negative direction.The rotating direction of upper and lower rotating mechanism is opposite first, the inclined plane of shaping blade towards the direction of rotation is opposite with the direction of movement of the powder lifted up, angle is close to vertical, impact and break up agglomerated powder and satellite ball, then the rotating direction of upper and lower rotating mechanism is same, the inclined plane of shaping blade towards the direction of rotation is close to the direction of movement of the powder lifted up, mainly with friction effect, improve powder surface finish.The stirring blade of lower rotating mechanism makes the friction effect between powder particles in cylinder, can also quickly improve the surface finish of powder.

The application discloses a steel formwork with partially detachable end part of prefabricated long and large box girder, belongs to the technical field of prefabricated concrete beam production, and has a downward detaching mechanism for the bottom die strip in the range of width D close to the end part along the direction of the bridge, and has an outward detaching mechanism for the side die block in the range of height H close to the bottom along the vertical direction, and the surface of the bottom die strip and the side die block after being detached can form a height difference with the surface of the outer formwork, the height difference being h. The use method is as follows: after the concrete is poured and completed, the end part of the outer formwork is subjected to a preset detaching behavior before the prestressed steel strand is tensioned, so that the contact surface provided by the outer formwork can effectively adapt to the upward deflection of the beam body after the prestressed steel strand is tensioned, and thus the phenomenon that the stress is concentrated at the end part of the beam body and the friction effect is remarkable is effectively improved, and the problem that cracks are generated at the edge of the end part of the bottom plate during the prefabrication of the long and large box girder is fundamentally solved.

The invention belongs to the field of iron tower climbing, and particularly relates to an electric iron tower climbing anti-falling device which comprises a sliding rail, the sliding rail is arranged to be in a T shape, a mounting plate is arranged on one side of the sliding rail, a clamping assembly is arranged in the mounting plate, two sliding rods are symmetrically and slidably connected to the inner wall of the mounting plate, and one end of each sliding rod is fixedly connected with a first limiting block; the other ends of the two sliding rods are fixedly connected with second limiting blocks, and adjusting assemblies are arranged at the tops of the sliding rods. According to the climbing anti-falling device for the electric power iron tower, the position of a sliding rod is adjusted through cooperation of a clamping block and a clamping groove, a mooring rope is made to be away from the position of a mounting plate, when a constructor accidentally falls, the constructor can easily pry a second limiting block to move downwards through the weight, a rubber pad is made to tilt upwards and abut against the back face of a sliding rail, and the safety of the constructor is improved. The situation that the friction effect of the rubber pad is affected due to the fact that a linear falling line of constructors is close to a moving line of the falling protector is avoided.

The utility model discloses an electric power construction insulation operating rod which comprises a square tube and a screw rod, a connecting ring is fixedly installed at the bottom end of the outer side wall of the square tube, a bearing is fixedly installed on the inner side wall of the connecting ring, a rotating tube is fixedly installed at the top of the inner ring of the bearing, a nut is fixedly installed at the top end of the rotating tube, and the rotating tube and the nut are both located in the square tube. The bottom end of the square tube is connected with the bearing through the connecting ring, the inner ring of the bearing is connected with the nut through the rotating tube, the inner side wall of the nut is connected with the screw, the screw is connected with the inner side wall of the nut through the rotating tube, and the bottom end of the screw extends to the lower side of the interior of the square tube. During use, the bottom end of the square pipe can be located near the eyes of a worker, then operation is conducted, the height position of the hook can be calibrated conveniently, the limiting sliding block is composed of a square block and limiting wheels on the two sides, traditional sliding limiting is changed into rolling limiting, the friction effect is greatly reduced, and operation of the worker is facilitated.

The utility model provides a lifting device for testing a reversed loader, which relates to the technical field of lifting devices and comprises a movable seat, a supporting platform and a movable platform, the supporting platform is arranged in the middle of the top of the movable seat, a guide groove is arranged on one side of the supporting platform, the movable platform is movably mounted in the guide groove, and the movable platform is arranged in the guide groove. A hydraulic jack is arranged at the top of the moving seat at the middle position below the guide groove; the movable base can move to the position needing to be lifted, the movable platform is jacked up through the hydraulic jack, after the movable platform reaches the preset height along the supporting platform, the hydraulic jack is locked, the fastening bolt on the side face of the supporting platform is rotated, and the supporting platform and the movable platform are locked in an auxiliary mode based on the friction effect of the protrusions. The double-supporting effect is achieved, the requirement of temporary machine testing is met, the machine testing efficiency of transportation type products can be improved, double lifting supporting locking is achieved, safety is guaranteed, and operation is convenient.

The invention provides a numerical method and system for high-precision prediction of gas-driven piston motion in a powder dense-phase conveying process, and the method comprises the following steps: 1, taking a powder fuel supply system as a research object, setting an initial field of the research object, obtaining the physical properties and transportation conditions of a powder layer under the initial field of the research object, and calculating the physical properties of the powder layer; the initial static state of the piston is set as a starting point; 2, on the basis of a pre-constructed mesoscale solid phase corresponding force model, the total gas-solid resistance borne by the piston in the static state of the piston is obtained through calculation; 3, based on the gas-solid total resistance borne by the piston, the piston starting critical condition is set; 4, performing numerical simulation on piston motion based on a piston starting critical condition; according to the method, the actual stress environment of the piston is combined, solid phase corresponding force sudden change and the friction effect after powder deformation are comprehensively considered, the whole-process motion characteristic prediction of the piston from static state to dynamic stability has high credibility, and the problem of simulation distortion caused by inaccurate motion characteristics of a traditional model is solved.

The present application relates to the technical field of oil exploitation, and particularly relates to a method for testing cement-casing cementing strength based on friction effect, which comprises the following steps: performing cement-casing interface cementing strength experiment, collecting displacement, pressure and strain data of strain gauge of cement extrusion, and drawing load-displacement curve; performing rock mechanics experiment to obtain cement stone elastic parameters; establishing cement-casing interface cementing strength model of friction effect; constructing cohesive unit of friction effect by using Fortran; establishing cement-casing geometric model in ABAQUS software, inputting elastic parameters of cement-casing into unit body of the geometric model; and obtaining calculation results of cement-casing cementing surface according to finite element simulation results. In the present application, the cement-casing interface cementing strength is characterized by pressure when the interface is damaged, but in the damage process, there is friction effect in addition to cementing effect, and it is inaccurate to use shear strength to characterize cementing strength.

The utility model discloses a thermal spraying coating wear resistance testing device, which relates to the technical field of coating detection and comprises a fixing frame, a mounting frame is arranged in the fixing frame, mounting plates are arranged on two sides in the mounting frame, two electric telescopic rods are mounted on one side, close to the mounting frame, of each mounting plate, and the electric telescopic rods are connected with the mounting frame. And one end of the electric telescopic rod is connected with one side of the interior of the mounting frame through a bolt, and a driving motor is mounted at the end, close to one side of the mounting frame, of the mounting plate. The cam is driven by the driving motor to rotate along with the connecting rod, and in the rotating process of the cam, the friction block can stably reciprocate by combining the elastic effect of the connecting rod and the guiding effect of the sliding block, so that the friction effect of the friction block is improved. Therefore, friction treatment can be carried out on equipment parts with thermal spraying coatings through reciprocating motion of the friction blocks, the efficient wear resistance detection process of the device is achieved, and the device is convenient to use.

The invention discloses a two-degree-of-freedom pointing mechanism driven by piezoelectricity. The two-degree-of-freedom pointing mechanism comprises an L-shaped support, first piezoelectric ceramics, second piezoelectric ceramics, a first rotor, a second rotor, a first pressing plate, a second pressing plate, a first flange, a second flange, a first bearing, a second bearing, a first sensor and a second sensor. The piezoelectric stator is directly driven by single-phase sinusoidal voltage, the driving foot is in direct contact with the rotor, elliptical motion of the driving foot is converted into rotation motion of the rotor through a friction effect, and blades are driven to move to change pitching and longitudinal angles of the camera. The piezoelectric-driven two-degree-of-freedom pointing mechanism designed by the invention adopts a structural function integrated design method, and is more compact and larger in dynamic range.

A segmented and adjustable mast slide (5) that will eliminate the problem of the mast slides (5) connected to the pile driving unit (4) getting stuck in the U profile bearing element (6) for various reasons in pile driving machines (1), characterized by comprising of; a middle slide part (52) with a screw slot (14) thereon, a right slide part (51), a left slide part (53), a screw (9) enters the screw slot (14) in the middle slide part (52) to ensure the back-and-forth movement of the middle slide part (52), a screw bearing (10) that supports the said screw (9) and allows the screw (9) to move back and forth since it is fixed, upper support plate (15) to prevent the right slide part (51) and the left slide part (53) from moving upward due to the friction effect formed by the inner wall of the U profile bearing element (6) during the downward movement of the mast (8), lower support plate (16) to prevent downward movement of the right slide part (51) and the left slide part (53) during upward movement of the mast (8), both by gravity and by friction with the inner wall of the U profile bearing element (6).

The light wear-resistant floating caliper disc brake comprises a brake disc and a brake caliper, an axle is installed on the left side of the brake disc, a left vertical plate and a right vertical plate are fixedly installed at the left end and the right end of the top of the axle respectively, a cross rod is installed between the left vertical plate and the right vertical plate, and a sliding ring is fixedly installed on the left side of the bottom of the brake caliper and arranged on the cross rod in a sleeving mode. The wheel grooves are formed in the upper end and the lower end of the side wall of the transverse rod, the rolling wheels connected through the rotating shafts are arranged in the sliding rings, the rolling wheels are installed in the wheel grooves in a rolling mode, when the brake caliper moves left and right, the rolling wheels can roll left and right in the wheel grooves, and compared with traditional sliding contact, the friction effect can be greatly reduced, abrasion is reduced, and the service life is prolonged; and a containing groove is formed in the right side face of the friction lining plate, a positioning rod is arranged in the containing groove, the positioning rod can position the two bolts, random rotation is avoided, and the reliability of the friction block is improved.

The invention relates to a contact device for bringing slip bars into contact, comprising: a screw element and a threaded sleeve for creating a screw connection between a first slip bar and a second slip bar, and a contact element that can be positioned between the first and second slip bars, is lockable at the screw element, rotates with the screw element relative to the slip bars, and is pressable against the first and second slip bars by means of two opposing contact surfaces of the contact element, achieved by screwing the screw element into the threaded sleeve, thus creating a friction effect between the contact surfaces of the contact element and the surfaces of the slip bars. Figure 1

The utility model provides a damping rotation structure of a miniature camera, which comprises a rotating shaft, a camera assembly and a rotating shaft support, the rotating shaft is of a hollow structure, the camera assembly is arranged in the hollow structure, the rotating shaft support is rotatably connected with the rotating shaft, the rotating shaft is provided with at least one wave gear buckle, and a plurality of wave teeth are arranged in the rotating shaft support. And the wave gear buckles are clamped among the wave teeth. According to the damping rotation structure, the rotation damping effect of the structure is achieved through collision and friction between the wave gear buckle on the rotation shaft and the wave teeth on the rotation shaft support. During rotation, the wave gear buckle and the wave teeth are in continuous contact and collision, and the wave gear buckle generates elastic deformation and has a friction effect with the tops of the wave teeth during each collision. Therefore, according to the structure, the use of rubber parts is reduced, the product cost is reduced, the environment is protected, the assembly steps and the assembly difficulty of the micro camera are reduced, the assembly efficiency is improved, the consistency of the rotation damping hand feeling is improved, and the use experience of a user is improved.

The utility model relates to the technical field of ground cleaning machines, and discloses a ground cleaning machine adjusting mechanism which comprises a cleaning machine body, the cleaning machine body comprises a machine frame, moving wheels are arranged at the bottom end of the machine frame, an installation cover is embedded in the center of the machine frame, a through hole is formed in the surface of the installation cover, and a dust suction pipe is inserted into the through hole. A dust suction opening is formed in the bottom end of the dust suction pipe, and a movable plate and a fixed plate are arranged on the surface of the dust suction pipe from top to bottom. According to the adjusting mechanism of the ground cleaning machine, in the using process, the buffering adjusting assembly is arranged, a movable plate is slidably installed on the surface of a limiting sliding rod, and the movable plate is driven to move downwards through an abutting spring, so that a sweeping roller can abut against the ground, and the friction effect between the sweeping roller and the ground is ensured; and when rigid collision occurs between the sweeping roller and an external object, the sweeping roller can move upwards to avoid through upward movement of the movable plate, and the effect of avoiding and buffering in the vertical direction is achieved.

The present invention relates to the assembly of panel furniture (bookshelves, cabinets, kitchen units, office furniture, etc.), and in particular to an apparatus used to secure panels produced on CNC router machines for assembling them perpendicularly to one another, characterized in that it comprises the main body type 1 (3) comprising the elements of the lower base (3.4) which is placed by being slid horizontally along the x- axis into the said rabbet (F) and formed as a result of body channels (3.9) drilled on both edges using the milling method, the saw tooth part (3.5) which prevents the apparatus from moving forwards by increasing the frictional effect on the walls of the said rabbet (F), the screw hole (3.3) which allows the seating of the said minifix screw (2), female part (3.7) with three legs formed in the y-direction at the bottom of the fitting surface (3.6), the alignment protrusions (3.2) formed above and below the said screw hole (3.3), the main body cap (3.1) which fits over the edges of the chamfer (P) and ensures centering, and center hole (3.10) which allows chip dust to accumulate under the body; the auxiliary body type 1 (4) comprising the elements of flanks (4.2) which are assembled by moving in the y-axis direction towards the said fitting surface (3.6) such that the said alignment protrusions (3.2) are seated via the opening (4.1) and which exert pressure on the side walls of the said alignment protrusions (3.2), lock hole (4.3) which allows the insertion of the said locking apparatus (5), serrated surface (4.4) which increases the attachment strength of the body to the pressing panel (A), the male part (4.5) which provides clamping in the x-axis by passing over the said female part (3.7), and auxiliary body cap (4.6) fitted on the edges of the chamfer (P); and cover type 1 (6) concealing the body by being placed on the said auxiliary body type 1 (4).

The invention discloses self-adaptive beveling and welding integrated equipment for a small-caliber pipeline, and relates to the field of pipeline welding, the self-adaptive beveling and welding integrated equipment comprises a base, and a fixing mechanism is arranged on the upper portion of the base. The self-adaptive beveling and welding integrated equipment for the small-caliber pipeline has the functions of clamping, transporting and rotating the pipeline and beveling and welding, and the pipeline can be accurately conveyed to the positions of a beveling machine and a welding machine, so that the welding efficiency is improved, and the production cost is reduced. Meanwhile, the angle of the beveling machine is fixed through the friction effect between the positioning nut and the beveling seat and between the bracket and the beveling seat, so that the beveling machine is more convenient to debug, the beveled positions of the pipelines are cleaned by the iron brush after beveling of the pipelines is completed, and pipeline welding is completed under the condition that the two pipelines rotate at the same speed.

Laboratory grinding media mill (1), in particular planetary ball mill, centrifugal ball mill or vibrating mill, comprising: a grinding vessel (8) with a grinding bowl (10) and a grinding bowl lid (12) for closing the grinding bowl (10), wherein the grinding vessel (8) defines a grinding vessel interior (18) which can be filled with grinding material and grinding bodies in order to grind the grinding material in the grinding vessel interior (18) between the grinding bodies and walls of the grinding vessel (8) by means of impact and friction effects by means of rotational and / or oscillating movements of the grinding vessel (8), a grinding vessel receiving device (216) in which the grinding vessel (8) can be clamped, a motor drive (226) for driving the rotation and / or oscillating movement of the grinding vessel receiving device (216) with the grinding vessel (8) clamped therein, a mill control device (224) which controls the grinding process in the laboratory grinding media mill (1), wherein the grinding vessel (8) comprises: at least one sensor (62, 80, 110) which measures a state parameter of the grinding vessel (8) and / or the grinding vessel interior (18), an electronic display device (46) which is arranged on an outer side (9) of the grinding vessel (8) and which displays the state parameter measured by the sensor (62, 80, 110) visibly for the user directly on the outer side of the grinding vessel.

The utility model discloses a piezoelectric actuator comprising an elastic tube, two ends of which are respectively provided with a first port and a second port; the first sealing piece is arranged at one end of the elastic pipe and seals the first port; the second sealing piece is arranged at the other end of the elastic pipe and seals the second port, and a sealed cavity is defined by the elastic pipe, the first sealing piece and the second sealing piece; the stack piezoelectric ceramic is arranged in the closed cavity, the two ends of the stack piezoelectric ceramic are connected with the first closed part and the second closed part respectively, and the elastic pipe is always in a stretched state; one of the first sealing piece and the second sealing piece is provided with a wire for electrically connecting the stacked piezoelectric ceramic with an external power supply, and the other one is provided with an actuating end for applying pressure to the outside. According to the application, the elastic tube can be driven to deform along with the deformation of the stacked piezoelectric ceramic by utilizing the characteristic that the elastic tube can be telescopically deformed. Therefore, an existing shaft hole matching structure can be omitted, and the negative influence of the friction effect on the output linearity of the stacked piezoelectric ceramic is avoided.

The utility model discloses an impeller assembly for an impact crusher, which is positioned in an impact cavity and comprises an impeller body and a flexible cleaning structure which is arranged on the impeller body and synchronously rotates along with the impeller body, and a crushing discharge port is formed between the impeller body and a bottom plate of the impact cavity. And the flexible cleaning structure is positioned above the crushing discharge port to clean the crushing discharge port so as to prevent the crushing discharge port from being blocked by crushed materials. The flexible cleaning structure is arranged on the impeller body and rotates along with the impeller body attached to the discharging port, materials are prevented from being stacked at the discharging port, the flexible rope chain rotates along with the impeller, bonding materials on the path are continuously whipped, the material nesting area is reduced, and the effective use size of the impact cavity is increased; and the impact friction effect between the materials is improved, and the shaping and crushing effect of the materials is improved.

The invention relates to the technical field of geological disaster prevention and control, and discloses a dangerous rock mass reinforcing hollow anchor rod with a cutting disc and a using method of the dangerous rock mass reinforcing hollow anchor rod. The anchoring section of the rod body is provided with a cutting disc; the cutting disc comprises a main base, and a plurality of blade bases are evenly distributed in the circumferential direction of the main base. A sawtooth blade is rotatably mounted on the blade base through an anchor bolt; a buckle is mounted on the blade base; sawteeth are arranged in the circumferential direction of the main base when all the sawtooth blades are in the contraction positions; a torsion piece is mounted at the anchor bolt; the rod body is hollow, a plurality of grouting holes are formed in the anchoring section, and a hollow connecting assembly is arranged at the end, away from the anchoring section, of the rod body. According to the scheme, the anchor rod keeps the original friction effect between slurry and a hole wall, meanwhile, the mechanical meshing effect between the cutting disc and a rock-soil body is increased, meanwhile, based on the optimized anchor rod structure, the two effects are mutually promoted and improved, the pulling resistance of the anchor rod is remarkably improved, the long-term performance of the anchor rod in a complex environment is effectively enhanced, and the service life of the anchor rod is prolonged. The method is especially suitable for engineering reinforcement of dangerous rocks, side slopes, foundation pits and the like.