35results about How to "Reduce radial force" patented technology

A machining drill bit comprises a handle body, a cutting body and a blade body which are sequentially connected, the end, away from the cutting body, of the blade body is provided with two conical faces and two chip containing grooves, the two conical faces and the two chip containing grooves are sequentially and alternately arranged in the circumferential direction of the blade body, and cutting edge parts are formed between the groove walls of the chip containing grooves and the corresponding conical faces. The cutting body is provided with two chip grooves and two liquid inlet grooves, the two chip grooves and the two liquid inlet grooves are sequentially and alternately formed in the circumferential direction of the cutting body, each chip groove and each liquid inlet groove are spirally formed in the direction from the blade body to the handle body, and a cutting blade is formed in the position, between each liquid inlet groove and the corresponding chip groove, of the cutting body. The end, away from the handle body, of each chip discharging groove extends to the corresponding chip containing groove, and the end, away from the handle body, of each liquid inlet groove extends to the conical face. The machining device comprises the machining drill bit. The machining drill bit and the machining device can effectively reduce the cutting heat, improve the cutting efficiency and prolong the service life.

The present invention proposes a multi-branch stent for aortic dissection distal aneurysm zoning, belonging to the field of medical device technology. It includes a main covered stent, which is composed of a covering and a main stent. The main covered stent is sequentially arranged from one end to the other end as an upper half, a waist transition section and a lower half; the upper and lower parts of the upper half in the vertical direction are respectively a soft zone and a hard zone; the upper and lower parts of the lower half in the vertical direction are respectively a hard zone and a soft zone; the upper and lower parts are respectively provided with two embedded branch stents; the embedded branch stent in the upper half is used to reconstruct the celiac trunk and the superior mesenteric artery, and the embedded branch stent in the lower half is used to reconstruct the bilateral renal arteries. The present invention increases the adaptability of the anchoring areas at both ends of the main covered stent to the blood vessels, prevents the rupture of the inner membrane sheet of the distal rupture, improves the adhesion of the main covered stent to the tube wall, reduces the incidence of type I internal leakage, reduces the incidence of new stent-induced ruptures after surgery, and can reconstruct visceral arteries at the same time.

The utility model belongs to the technical field of rotors, and particularly relates to a rotor punching sheet, a rotor, a motor, a power assembly and a vehicle. The rotor punching sheet comprises a plurality of magnetic poles arranged along the circumferential direction of the rotor punching sheet, each magnetic pole is provided with a magnetic steel groove group, a first groove and a slotted hole, each magnetic pole is provided with a d axis and a q axis, the magnetic poles are symmetrical about the d axis, and the adjacent magnetic poles are symmetrical about the q axis; the first groove is arranged at the intersection of the outer edge of the magnetic pole and the d shaft, the first groove is arranged at the outer side of the magnetic steel groove group in the radial direction of the rotor punching sheet, and the q shaft passes through the groove hole. According to the utility model, through the combination of the first grooves on the d-axis and the slotted holes on the q-axis, magnetic field forces in the tangential direction and the radial direction brought by a harmonic magnetic field can be reduced, lower air gap flux density and harmonic content are obtained, the torque pulsation and the radial force of the rotor punching sheet are reduced, and the purpose of reducing motor noise is achieved.

The utility model provides a driving system. The driving system comprises a speed reducer, a plurality of motors and a support. The speed reducer comprises a front cover and a shell, an output gear and a plurality of input gears meshed with the output gear are arranged in the shell, and the input gears are evenly distributed in the circumferential direction of the output gear. An output through hole is formed in the front cover, and an output shaft of the output gear extends to the outer side of the front cover through the output through hole; an input through hole is formed in the shell, and an input shaft of the input gear extends to the outer side of the shell through the input through hole; axes of the output shaft and the input shaft are parallel; the plurality of input gears are in one-to-one correspondence with the plurality of motors; a driving shaft of the motor is coupled with the input shaft and is used for driving the input gear to rotate and driving the output gear to rotate; the support is arranged on the sides, away from the speed reducer, of the motors and used for fixedly connecting the ends, away from the speed reducer, of the motors. Large torque output of the driving system is achieved, and the reliability of the driving system is further improved.

The utility model provides a lens and a vehicle, and the lens comprises a lens barrel and a lens group which is disposed in the lens barrel. The lens group comprises a first lens and a second lens, the object side surface and / or the image side surface of the first lens are / is a concave surface near an optical axis, and the object side surface and the image side surface of the second lens are convex surfaces near the optical axis; the lens barrel comprises a first mounting part and a second mounting part, the outer side wall of the first lens abuts against the first mounting part, and the outer side wall of the second lens abuts against the second mounting part; the first installation part has a first thickness in the direction perpendicular to the optical axis, the second installation part has a second thickness in the direction perpendicular to the optical axis, and the first thickness is smaller than the second thickness. According to the utility model, through setting the wall thickness of the lens barrel, the radial force of the lens can be effectively reduced, the deformation of the optical effective part of the lens is reduced, the temperature drift is reduced, the stability of the lens is improved, and the product performance is improved.

The utility model relates to a hydraulic forklift pump noise testing device which comprises a sound insulation wall, a driving assembly and a hydraulic assembly are installed in the sound insulation wall, a pump body positioning seat is installed on the sound insulation wall, an oil outlet pipe and an oil inlet pipe are installed on the hydraulic assembly, and the oil outlet pipe and the oil inlet pipe extend out of the sound insulation wall. The driving assembly comprises a driving motor; an output shaft of the driving motor is connected with a transmission shaft through an elastic coupling; the input end and the output end of the oil tank are connected with one end of an oil inlet pipe and one end of an oil outlet pipe respectively. And the other ends of the oil outlet pipe and the oil inlet pipe are connected with a hydraulic forklift pump. The bearing seat is additionally arranged between the motor and the pump body positioning seat, so that the distance between the motor and the oil pump is lengthened, and the influence of environmental noise and the like generated by a transmission shaft, a coupler, especially the motor, on noise test data results is effectively reduced.

The utility model relates to an engine cylinder cover grabbing device, and belongs to the technical field of cylinder cover grabbing and transferring. The positioning pressure head is arranged on the rack, the clamping mechanism is used for holding a workpiece to be grabbed, the clamping mechanism comprises a left lifting rod, a right lifting rod and a driving mechanism, and the driving mechanism is used for driving the left lifting rod and the right lifting rod to be matched with each other to clamp or loosen the workpiece; the positioning pressing head is matched with a positioning hole in a workpiece to be grabbed, the positioning pressing head is arranged on the machine frame in a lifting mode, and the device further comprises a pressing head self-locking mechanism used for locking the positioning pressing head. The pressing head self-locking mechanism comprises a clamping groove, a pressing block and a pressing driving cylinder which drives the pressing block to be matched with the clamping groove in an inserted mode to lock the positioning pressing head. The engine cylinder cover assembling device is simple in structure, convenient to operate, stable in workpiece grabbing and safe in the transferring process, manual participation is not needed, stable and safe transferring of workpieces is achieved, and therefore the engine cylinder cover assembling efficiency is improved.

The utility model discloses a knob testing machine in the technical field of knob detection, and aims to solve the problem of test accuracy of the conventional knob testing device. The device comprises a linear mechanism of a first mounting rack, a second mounting rack, a rotating mechanism on the second mounting rack and a measuring table, a driving assembly in the linear mechanism drives the sliding plate to linearly reciprocate on the first mounting frame; a rotating shaft in the rotating mechanism is rotationally connected with the second mounting frame, a gear at the lower shaft end is meshed with a rack on the sliding plate, a positioning column of a circular truncated cone at the upper shaft end limits a limiting groove of the follow-up rotating disc, and the width of the limiting groove is larger than the diameter of the positioning column; a limiting column on the clamping sleeve is arranged in a limiting hole of the follow-up turntable; a knob to be measured is fixed on the measuring table; the knob part is arranged on the clamping sleeve through the measuring table; a plurality of clamping screws penetrate through the clamping sleeve in the radial direction to be jointly matched with a clamping knob. The method is suitable for detecting the service life of the knob, and can improve the accuracy of service life detection and judgment.

The invention relates to a highway tunnel draught fan and a vibration isolation device thereof, and belongs to the technical field of tunnel draught fan installing.A transverse damping unit and a vertical spring set are arranged, and the draught fan is connected with a vertical rod through a cross beam, so that transverse acting force and vertical acting force generated when the draught fan works are absorbed by the transverse damping unit and the vertical spring set correspondingly; therefore, it is guaranteed that the vibration isolation shell does not shake along with vibration generated by working of the fan, fixing bolts connected to the vibration isolation shell do not loosen, and the problem that due to the fact that vibration generated during working of the fan has radial acting force and transverse acting force, an existing fan vibration isolation device is not prone to shaking due to vibration generated during working of the fan is solved. The problems that only radial acting force between the draught fan and the vibration isolation device can be weakened by arranging the springs, but transverse acting force cannot be solved, so that the vibration isolation device shakes left and right along with work of the draught fan, and the risk that bolts installed on the vibration isolation device loosen is increased are solved.

The invention provides an anti-seismic diesel engine fire pump set, which relates to the technical field of fire fighting equipment and comprises an anti-seismic diesel engine fire pump set base, a diesel engine and a fire pump, the anti-seismic diesel engine fire pump set base comprises a base frame and at least one reinforcing steel channel main beam arranged on the base frame. The diesel engine main engine is fixedly mounted on the anti-seismic diesel engine fire pump set base through the integrated base; the fire pump is fixedly installed on the anti-seismic diesel engine fire pump set base through pump feet and comprises a double-volute pump body fixedly installed on the pump feet, a pump cover connected with the double-volute pump body and located above the double-volute pump body, a pump shaft penetrating through the double-volute pump body and the pump cover and a double-suction impeller installed on the pump shaft. The anti-seismic performance of the diesel engine fire pump set is improved, and normal operation of the whole pump set under the earthquake working condition is guaranteed. According to the double-volute pump body and the double-suction impeller, the axial force generated when the impeller operates can be self-balanced, meanwhile, the radial force of the impeller is reduced, and the pump shaft operates more stably.

The utility model relates to the technical field of lifting or traction type winch equipment, and provides a mechanical stroke limiting trigger adjusting device which comprises a winding drum, the winding drum is connected with a supporting shaft, the supporting shaft is connected with a bearing cover through an installation bearing, and the bearing cover is connected with a first supporting plate and a second supporting plate. The first supporting plate and the second supporting plate are installed on traction winch equipment, a limiting rotary disc is rotationally arranged on the bearing cover, and an upper limiting part and a lower limiting part are arranged on the limiting rotary disc. The limiting rotary disc rotates along with the supporting shaft, the stroke is limited through an upper limiting part and a lower limiting part, the position of an upper limiting trigger rod is adjusted by rotating a first sliding ring, so that the upper stroke is adjusted, the limiting rotary disc is fixed through a first positioning bolt, and a plurality of first limiting holes are formed in the limiting rotary disc to achieve the effect of adjusting multiple strokes; the upper limiting trigger rod triggers the upper limiting signal contact in the rotating process, the position of the lower limiting trigger rod is adjusted by rotating the second sliding ring, and therefore the down stroke is adjusted.

The utility model discloses a multi-fulcrum displacement direction adjusting transmission mechanism and circuit breaker, comprising an input device and a displacement conversion mechanism, the displacement conversion mechanism comprises: a driving rod, the first end of which is in transmission connection with the input device; the first end of the driven connecting rod is hinged to the second end of the driving rod; the first end of the sliding block connecting rod is hinged to the sliding block device, and the second end of the sliding block connecting rod is hinged to the second end of the driven connecting rod; the first end of the driving connecting rod is hinged to the rack, and the second end of the driving connecting rod is hinged to the first end of the driven connecting rod; the first end of the conversion connecting rod is hinged to the rack, the second end of the conversion connecting rod is hinged between the first end and the second end of the driven connecting rod, and the driving connecting rod and the conversion connecting rod are distributed on the two sides of the driven connecting rod. According to the utility model, the radial force generated in the movement process is reduced, and the stability in the movement process is improved. And the sliding block device moves approximately linearly, so that the radial displacement is reduced, and the running speed of the sliding block device can be increased.

The utility model relates to the technical field of tunnel construction, in particular to a trestle body supporting structure which comprises a trestle body, a front lifting supporting device is arranged at the front end of the trestle body, and a trestle walking device is arranged at the rear end of the trestle body. A middle lifting supporting device is arranged at the position, corresponding to the position between the front lifting supporting device and the trestle walking device, of the trestle body. The front lifting supporting device comprises front fixing supporting legs symmetrically arranged on the two sides of the trestle body. Compared with the prior art, the structure of the front lifting supporting device is additionally provided with the second front movable supporting leg and the hydraulic oil cylinder for driving the second front movable supporting leg to ascend and descend, and the horizontal component force of the second front movable supporting leg to the trestle body support is opposite to the horizontal component force of the construction vehicle to the trestle when the construction vehicle walks in a full-load mode. Therefore, due to the arrangement of the second front movable supporting leg, the radial force borne by the first front movable supporting leg can be reduced, and then the first front movable supporting leg can be prevented from being damaged due to the fact that the radial force is too large.

The utility model discloses a center frame top head, which relates to the technical field of machine tool equipment and is characterized in that a mounting groove is arranged on the end surface of one end of a mounting seat, a support roller and a tapered roller bearing which rotate in the same direction are sequentially and detachably mounted between two inner side walls of the mounting groove from inside to outside, and a shaft sleeve is sleeved on the outer ring surface of the tapered roller bearing; one side of the shaft sleeve abuts against and is matched with the supporting roller, the other side of the shaft sleeve extends out of the mounting groove, limiting pieces used for horizontally limiting the tapered roller bearing are arranged between the two end faces of the tapered roller bearing and the inner side wall of the adjacent mounting groove, and a connecting base connected with a machine tool is arranged on the end face of the other end of the mounting base. According to the utility model, the high stability of the center frame ejector head is realized, and great convenience is provided for subsequent overhaul and maintenance.

The utility model provides a machining tool for high-strength steel, and aims to solve the technical problems that a D25 tool is easy to deform or break, and the lifting effect of a D50 tool is not obvious. The machining tool comprises a tool handle, eight installation parts are arranged at the end of the tool handle, and the installation parts are evenly distributed around the end of the tool handle by a circle; the eight blades are correspondingly arranged in the eight mounting parts respectively, the blades are detachably connected with the mounting parts, the ends of the blades protrude out of the end of the cutter handle, and an included angle ranging from 6 degrees to 8 degrees is formed between the length direction of each blade and the axis of the cutter handle. The cutting output in unit time is increased by increasing the number of the blades, and the cutting edge angle of the blades is set to be an included angle of 6-8 degrees, so that radial force borne by the blades is reduced, the feeding speed of the cutter is increased, axial force can be increased, and the cutting rigidity and stability of the cutter are improved. According to the technical scheme, the stability of the blade can be effectively improved, and the machining efficiency is greatly improved.

The utility model discloses elevator speed governor action speed detection platform, including quick locking assembly, quick locking assembly includes concave strip and convex strip, the outer ring of main shaft rod four -around fixed installation concave strip, the outer ring of external connection axle four -around fixed connection convex strip, convex strip protruding end activity joint concave strip groove end, quick locking assembly still includes rectangular groove, dismounting spring, clamping block and clamping groove, the middle part of convex strip is seted up rectangular groove, and dismounting spring and clamping block are connected in rectangular groove, and clamping block is located above dismounting spring, and the middle part of concave strip is seted up clamping groove, and clamping block is connected in clamping groove. The utility model can guarantee the concentricity of main shaft rod and external connection axle through the accurate matching of geometric shape, reduce the eccentric problem of shafting caused by bolt hole error or uneven assembly, reduce additional radial force and vibration, make motor output speed more stable, thereby improve the precision of speed governor action speed detection.

The application relates to the technical field of centrifugal pumps, in particular to an energy-saving centrifugal pump with low radial force, which comprises a pump body, a pump shell is fixedly arranged on the pump body, a pump shaft is installed in the pump shell, an impeller is installed on the pump shaft, an auxiliary shaft support mechanism is also installed in the pump shell, the pump shaft is assisted and supported through the auxiliary shaft support mechanism, the auxiliary shaft support mechanism is connected with a self-locking assembly, the auxiliary shaft support mechanism drives the self-locking assembly to move, thereby realizing the locking of the auxiliary shaft support mechanism, the auxiliary shaft support mechanism is also connected with a wheel body fixing mechanism, an auxiliary shaft support frame is arranged in the pump shell, when the impeller is installed on the pump shaft, the impeller can drive the auxiliary shaft support frame to move, thereby making the auxiliary shaft support frame contact with the pump shaft from the periphery of the pump shaft, so that the pump shaft can be well assisted and supported, even if the bearing is worn, the pump shaft will not appear the phenomenon of deviation, and the support stiffness of the pump shaft is fully ensured.

The utility model discloses an efficient muddy water sealing type middle reduction input end sealing structure assembly which is characterized in that the efficient muddy water sealing type middle reduction input end sealing structure assembly is composed of an oil seal, a flange, a dust blocking disc, an adjusting ring, an O-shaped ring, a cylindrical gear shell, an input shaft, a bearing and a flange nut, and the oil seal is provided with an outer diameter fixing face, a main lip opening, a first auxiliary lip opening, a second auxiliary lip opening and a long auxiliary lip opening. A long auxiliary lip matching surface and an outer circular surface are arranged on the dust blocking disc; the main lip of the oil seal is provided with an oil return line, the oil sealing capacity is greatly improved, the dust sealing capacity is improved through the design that three ribs of the second auxiliary lip are spaced by two grooves, and the problem of vacuum pumping is solved. The dust blocking disc is additionally arranged, and a small gap structure is designed between the dust blocking disc and the adjusting ring, so that invasion of large dust and mud can be obviously blocked; the long auxiliary lip of the oil seal is in lap joint with the dust blocking disc, the dust sealing capacity and the muddy water sealing capacity can be directly improved, and a new thought and an effective solution scheme are provided for arrangement of a mine truck bridge middle subtraction input end sealing structure.

The invention relates to a sealing assembly and a rolling bearing. The sealing assembly is annular as a whole and comprises a framework with a radial inner end; the sealing body is attached to the framework, a dynamic sealing lip inclining towards the first axial side is arranged at the position, at the radial inner end of the framework, of the sealing body and used for abutting against a bearing inner ring in a dynamic sealing mode, and a plurality of grooves spaced in the circumferential direction are formed in the position, at the second axial side, of the lip edge of the dynamic sealing lip. The groove divides the lip edge of the dynamic sealing lip into a thin lip edge and a thick lip edge in the circumferential direction. The groove is formed in the lip edge of the dynamic sealing lip, so that when the lip edge of the dynamic sealing lip abuts against the bearing inner ring in a dynamic sealing mode, the lip edge of the dynamic sealing lip is easier to stretch in the circumferential direction, the banding force on the bearing inner ring is reduced, the radial force on the bearing inner ring is reduced, abrasion between the dynamic sealing lip and the bearing inner ring is reduced, and the service life of the dynamic sealing lip is prolonged. The dynamic sealing lip is prevented from being separated from the bearing inner ring due to abrasion, the service life of the sealing assembly is prolonged, and the sealing assembly can conduct electricity for a long time.

The present invention provides a rivet gun, characterized in that it comprises a first handle, a second handle, a transmission mechanism and a clamping and pulling mechanism, the first handle is fixedly connected to or integrated with a shell body that defines the clamping and pulling mechanism, and the second handle can rotate relative to the first handle around a first fixed axis; the clamping and pulling mechanism comprises a pull rod with a tooth groove; the transmission mechanism comprises a gear member with a gear end that can rotate around the second fixed axis, and the gear end of the gear member is configured to cooperate with the tooth groove of the pull rod; the second handle is connected to the transmission mechanism, and is configured to drive the gear member of the transmission mechanism to rotate when the second handle is rotated and opened relative to the first handle, and the gear member pushes the pull rod forward through the cooperation between the gear end and the tooth groove; when the second handle is rotated and closed relative to the first handle, it drives the gear member of the transmission mechanism to rotate, and the gear end of the gear member pulls the pull rod backward through the cooperation with the tooth groove.

The utility model relates to the technical field of injection molding machines, and provides a double-screw electric ejection device of an injection molding machine, which comprises a controller, a center plate and an ejector pin push plate, a power mechanism is arranged on one side of the center plate, a center ejector rod is arranged in the middle of one side of the ejector pin push plate, and four auxiliary ejector pins are arranged around the center ejector rod. The four auxiliary ejector pins are distributed in a circumferential array mode, a distance measuring sensor is arranged on the other side of the ejector pin push plate, and two ejector pin guide rods and two ejector pin lead screws are arranged on one side of the ejector pin push plate. According to the arrangement of the structure, when the motor in the power mechanism drives the ejector pin lead screw to rotate, the ejector pin lead screw drives the ejector pin push plate to linearly move back and forth on the ejector pin guide rod, the radial force generated by the ejector pin push plate is borne by the ejector pin guide rod, the radial force borne by the ejector pin lead screw is reduced, the phenomenon that the ejector pin lead screw is broken is avoided, and the service life of the ejector pin is prolonged. Therefore, the purpose that the product is stably ejected out when the device works is achieved.

The present invention relates to the technical field of power generation, and in particular to a permanent magnet direct-drive generator and system, wherein the permanent magnet direct-drive generator comprises a main shaft, a rotor, a rotor sleeve, a shell, a stator, a stator sleeve, an end cover, a first support member and a second support member. The rotor is mounted on the main shaft, and a rotor sleeve is sleeved on the outer side of the rotor to seal the rotor in the rotor sleeve. The stator is then mounted in the shell, and a stator sleeve is sleeved on the outer side of the stator to seal the stator in the stator sleeve. The rotor and the stator can be sealed. When the permanent magnet direct-drive generator works underwater, the rotor and the stator can be prevented from being exposed to water. The sealed cavity between the end cover, the second support member, the main shaft, the rotor sleeve, the first support member, and the stator sleeve allows water to circulate inside and outside the generator. The sealing requirement for the generator is low, and there is no need to use a multi-layer lip seal seal. The structure of the permanent magnet direct-drive generator is simplified and the manufacturing cost is reduced.

The utility model relates to the technical field of uranium concentration processes, and provides an electric actuator and a vacuum regulating valve. The electric actuator comprises a supporting sleeve, a motor, a stroke rod and a transmission assembly. The supporting sleeve is provided with a first supporting end and a second supporting end. The motor is arranged at the first supporting end. The stroke rod is arranged at the second supporting end. The transmission assembly comprises a transmission nut and a sliding part, the transmission nut is rotationally arranged in the supporting sleeve and connected with the motor, the sliding part is slidably arranged along the stroke rod, one end of the sliding part is in threaded fit with the transmission nut, and the other end of the sliding part is used for being connected with the valve rod. By arranging the supporting sleeve, the transmission nut in the transmission assembly is rotationally arranged in the supporting sleeve, the stroke rods are arranged at the end, away from the motor, of the supporting sleeve, in the horizontal direction, the situation that the size of the electric actuator is increased due to the fact that the distance between the two stroke rods is affected by the transmission assembly can be avoided, and the electric actuator is compact in overall structure; and the occupied space is small.

The present invention discloses a Fibonacci spiral impeller, comprising an impeller body, the impeller body comprising a base, blades are arranged on one side of the base, a through hole connected to the output shaft of a motor is opened in the center of the base; the blades are enveloped to form a spatial flow channel, the starting point of the spatial flow channel is arranged on the outside of the through hole, the end point of the spatial flow channel is arranged on the outer edge of the base, the cross section of the spatial flow channel is a groove shape, and the bottom of the spatial flow channel protrudes to the other side away from the blade; the shape of the base is the same as the shape of the outermost 360° frame of the blade; the blade wrap angle is 720° to 1440°, and the trajectory curve of the spatial flow channel is {f(θ, r(θ), H(θ))}. The Fibonacci series impeller of the present invention can reduce the radial force borne by the impeller, improve the head pulsation, and reduce the dynamic load of the shaft system, thereby playing a role in suppressing the vibration of the pump, improving the operating stability of the whole machine, and extending the service life.

A balloon catheter system includes a catheter, a buffer tube, and a balloon assembly with enhanced cutting effect, wherein the balloon assembly includes a balloon and a metal mesh wrapped around the outside of the balloon, wherein the metal mesh includes a connecting proximal end, a connecting distal end, and an action segment connected therebetween, wherein the connecting distal end is connected to the distal end of the balloon, wherein a plurality of auxiliary cutting elements are dispersedly arranged on the action segment, wherein the catheter passes through the buffer tube and is connected to the proximal end of the balloon, wherein the proximal end of the buffer tube is connected to the outside of the catheter, and the distal end of the buffer tube is connected to the connecting proximal end. The present invention can accurately locate in a blood vessel, can provide an expansion force far greater than that of a traditional structure, can effectively expand even a highly calcified lesion, improves drug utilization, reduces vascular damage, and reduces restenosis rate, and is worthy of promotion and use in this field.

The dust removal device comprises a shell, a dust removal brush and a connecting part, a dust removal cavity is formed in the shell, the dust removal brush is arranged in the dust removal cavity, the dust removal brush is provided with a first end and a second end which are oppositely arranged, the first end is used for being connected with a driving assembly, and the dust removal brush is used for cleaning scraps of tabs. One end of the connecting part is connected with the second end, and the other end of the connecting part is rotationally connected with the cavity wall of the dust removal cavity. According to the technical scheme, the end, away from the driving assembly, of the dust removal brush is connected through the connecting component, so that the end, away from the driving assembly, of the dust removal brush is supported, the rotation gravity center of the dust removal brush is stabilized, the shaking amplitude of the dust removal brush during rotation is reduced, and radial stress at the joint of the dust removal brush and the driving assembly is reduced; and the possibility of fracture of the joint of the dedusting brush and the driving assembly is reduced.

The utility model relates to a workpiece marking positioning device, which comprises a support, a working table, a bearing support block, an adjustable stop block, a movable stop block and a driving mechanism, the bearing support block is arranged between the adjustable stop block and the movable stop block, the adjustable stop block is arranged on the working table in a manner of being adjustable in the horizontal direction, and the movable stop block is arranged on the working table in a manner of being adjustable in the horizontal direction. The bearing supporting block is arranged on the workbench in the height direction in an adjustable mode, the driving mechanism is arranged on the workbench, a driving rod of the driving mechanism is connected with the movable check block, and the movable check block acts under the action of the driving mechanism and is matched with the bearing supporting block and the adjustable check block to clamp and position a workpiece. The positioning device is simple and compact in structure, can be adjusted according to workpieces to be marked of different specifications, is convenient and fast to adjust, does not need to replace parts, improves the workpiece positioning efficiency and the workpiece marking efficiency, reduces the number of the parts, is convenient to manage, and can be suitable for marking and positioning of more workpieces of different specifications.

The invention discloses a split type child-mother type percutaneous puncture dilator which comprises a puncture needle sleeve and a puncture needle. An outer sheath and a sheath core are arranged on the puncture needle sleeve, the outer sheath is designed to be tearable, the sheath core is designed to be hollow, the inner diameter of the hollow part is equal to the outer diameter of the puncture needle body, the lower end of the sheath core is conical and large in taper, and a fixing bayonet is formed in the upper end of the sheath core and can be fixedly connected with the puncture needle entering the sheath core; the puncture needle comprises a needle sheath and a needle core, a lower needle tip is designed into a bevel opening, and the upper end is provided with a connecting part which can be fixedly connected with a fixing bayonet at the upper end of the sheath core of the cannula, so that the bevel opening surface of the needle tip at the lower end of the puncture needle is exposed out of the lower end of the sheath core. Compared with the prior art, the puncture dilator has the advantages that the whole puncture dilator serves as a mother sword, the puncture needle serves as a son sword, during operation, the puncture needle is independently used for positioning a puncture guiding guide wire, then the whole puncture dilation guide wire is conducted, the channel loss rate is reduced, the dilation success rate is increased, and therefore the puncture dilator is more practical.

The utility model discloses an improved box girder support embedded part which comprises a support, an embedded assembly is arranged on the lower side of the support, and a truss is arranged on the upper side of the support. The embedded assembly comprises a bolt, the bolt is in threaded connection with the embedded plate, the lower end of the bolt is movably connected with an embedded assembly, and the upper end of the bolt is in threaded connection with the support. By means of the embedded assemblies, the multiple embedded assemblies can be selectively installed according to the actual embedded depth and the site condition in the using process, so that the friction force between the embedded assemblies and cement is increased, and the strength of the support is improved.

The mechanical arm comprises a mechanical wrist, a palm assembly, a first mechanical finger and at least one second mechanical finger, and the mechanical wrist comprises a driving motor, a rotating shaft, a rotating shaft base and a first flange connecting plate; the palm assembly comprises a flange connecting piece, a second flange connecting plate and a palm body; the first mechanical finger comprises a first linear motor, a first near knuckle, a first middle knuckle and a first connecting rod, a first connecting point of the first near knuckle is rotatably connected with the palm body, and the end part of a driving shaft of the first linear motor is rotatably connected with a second connecting point of the first near knuckle; the second mechanical finger comprises a second linear motor, a second near knuckle, a second middle knuckle, a second far knuckle, a second connecting rod and a third connecting rod, the second linear motor is fixedly connected with the palm body, a first connecting point of the second near knuckle is rotatably connected with the palm body, and the end of a driving shaft of the second linear motor is rotatably connected with the second connecting point.