179results about How to "Prevent cascading" patented technology

The invention discloses an electromagnetic door lock of electrical equipment. The electromagnetic door lock comprises a slider block device, a starter, a mechanical sensor and a mechanical linkage device, wherein the slider block devices is moved to a closing position along with shutoff of a door of the electrical equipment, the starter is used for providing power for switching on and switching off a switch device, the mechanical sensor is used for determining the closing position of the slider block device (20), when the slider block device is not located at the closing position, the starter is locked by the mechanical linkage device, and when the slider block device is located at the closing position, the starter is released by the mechanical linkage device, so that the switch device is located at a switch-on position. The mechanical sensor and the mechanical linkage device not only control the electromagnetic door gate in use of the electrical equipment, but lock movable components in the electromagnetic door gate in a transportation process so as to prevent the movable components from playing in the transportation process, and avoid from causing the components of the electromagnetic door lock in an abnormal state.

The invention discloses an absorption compression type automatic-overlapping refrigerating system and a use method. The absorption compression type automatic-overlapping refrigerating system comprises a generator and the like; the generator is communicated with a solution heat exchanger which is communicated with an absorber; the absorber is further communicated with the solution heat exchanger which is communicated with the generator; the generator is communicated with a condenser which is communicated with a gas-liquid separator; the gas-liquid separator is further communicated with an evaporative condenser which is communicated with a first gas-liquid heat exchanger, the first gas-liquid heat exchanger is communicated with an evaporator which is communicated with the first gas-liquid heat exchanger, and the first gas-liquid heat exchanger is communicated with the evaporator which is communicated with the first gas-liquid heat exchanger communicated with a compressor; the gas-liquid separator is communicated with the evaporative condenser; the compressor and the evaporative condenser are communicated with the absorber.

The invention is applicable to the field of new materials and provides a graphene / nickel composite material, a preparation method thereof, an electrode plate and a capacitor. The preparation method comprises the steps of preparing graphite oxide, preparing a graphene oxide / nickel composite material, preparing the graphene / nickel composite material, and the like. In the preparation method of the graphene / nickel composite material, the graphene oxide and the foamed nickel are combined through an ultrasound mode to obtain the graphene / nickel composite material, so that the problems of lamination and agglomeration of the graphene oxide are effectively alleviated, and the energy storage property of the graphene / nickel composite material is also greatly improved. According to the preparation method of the graphene / nickel composite material, the graphene is uniformly adhered in a gap of the foamed nickel, so that the problems of lamination and agglomeration of the graphene are effectively prevented, and the energy storage property of the graphene is greatly improved.

The invention discloses a method for measuring the dimensions of specially-shaped conductor parts, which comprises the following steps: firstly, preparing a mandrel with the corresponding diameter according to the inclination aperture of the part to be measured, wherein one end of the mandrel is provided with an inclined plane intersecting with the mandrel end face, the intersecting line of the two planes passes through the diameter of the mandrel, and the angle of the inclined plane is in accordance with the inclination angle of the central line of an inclination hole of the part to be measured; secondly, connecting a limiting plate to the mandrel end face intersecting with the inclined plane of the mandrel; thirdly, placing the part to be measured on a detecting platform, inserting the mandrel along the inclination hole of the part, using the limiting plate to cause the end face having the inclined plane of the mandrel to superpose with the end face of the inclination hole of the part to change the inclined plane of the mandrel into a plane, and leading out the intersection point, namely an imaginary point D, of the end face of the inclination hole of the part and the central line thereof; and finally, using a measuring head of a height gauge to approach the intersecting line of the mandrel end face and the inclined plane so as to measure the height dimension H of the part. The method transforms the measurement imaginary point D of the part into a measurable point so as to satisfy the space and angle dimensions of the specially-shaped conductor of an isolating switch which cannot be measured by the prior method.

The invention relates to a transporting tool, in particular to a trolley, belonging to the technical field of trolleys. The trolley comprises a handgrip, a handspike, a bottom frame and caster wheels, wherein the handgrip is arranged at the top end of the handspike, and the caster wheels are distributed at the low end of the bottom frame. The invention is characterized in that the tail end of the handspike is connected with a handspike connecting piece through a rotating shaft, and the handspike connecting piece is fixed on the bottom frame. The trolley of the invention can be folded easily and can be stacked easily after being folded by matching the structure of corrugated boards; meanwhile, by matching universal wheels and directional wheels, the trolley can be effectively prevented from sliding in the processes of loading and unloading cargoes; and carriers can be sorted and managed conveniently by arranging tag boards. Thus, the trolley of the invention has good application prospects in production departments, warehouses, stations, large supermarkets and other occasions.

The invention discloses a vibration-adsorption structure of a carving knife of a digital wide-width electronic carving machine. Magneto-rheological fluid and magnet exciting coils are arranged on the two sides of a cantilever which is connected with the carving knife through flanges respectively and are connected with a controller through leads; the magneto-rheological fluid is filled into a cavity through a through hole and is sealed by a magnet-shielding sleeve and a seal ring; the magnet-shielding sleeve is connected with a supporting sleeve through an anti-vibration pad; the supporting sleeve for supporting the cantilever is fixedly connected with a machine tool through a flange structure; the cantilever is connected with the supporting sleeve by a sliding pair; and the rotating degree of freedom of the cantilever is limited by a set screw. The vibration-adsorption structure has the advantages of simpleness and easy processing production and reduces the vibration through the damping change of the magneto-rheological fluid and is particularly suitable for a system which needs axial vibration adsorption so as to control the magnitude of the vibration and improve processing precision.

The invention belongs to the field of electrochemical materials, and discloses a graphene / polythiophene derivative composite material as well as a preparation method and application thereof. The preparation method of the composite material comprises the following steps of: preparing graphite oxide; preparing a mixed solution of graphene oxide and thiophene derivative monomer; preparing the graphene / polythiophene derivative composite material; and purifying the graphene / polythiophene derivative composite material. The prepared graphene / polythiophene derivative composite material has the advantages of good discharge performance, long cycle life, high thermal stability and the like.

The invention discloses an internal-model-based sliding mode control method capable of inhibiting mismatching disturbance of a permanent magnet linear motor. The internal-model-based sliding mode control method includes the steps that a five-phase fault-tolerant permanent magnet cylindrical linear motor model with mismatching disturbance is set up; an internal model controller of an ideal system is designed by adopting an internal model control strategy; based on the motor second-order mathematic model, mismatching disturbance observers are designed to observe mismatching disturbance of a motor system; two kinds of mismatching-disturbance-based observers are designed, the sliding mode control rules (the symbol is shown in the description) of the system under the two methods are solved; the expression (the symbol is shown in the description) is equivalently transformed to contain system mismatching disturbance errors, the Lyapunov function is selected, and the obtained sliding mode control rules (the symbol is shown in the description), a d-axis voltage set value (the symbol is shown in the description), an x-axis voltage set value (the symbol is shown in the description) and a y-axis voltage set value (the symbol is shown in the description) are used for achieving high-performance operation of the internal-model-based sliding mode control system capable of inhibiting mismatching disturbance of the fault-tolerant permanent magnet cylindrical linear motor by means of a voltage source inverter through a CPWM modulation method, wherein the d-axis voltage set value, the x-axis voltage set value and the y-axis voltage set value are output by a PI current regulator.

The invention discloses a multi-port TBWSS based on LCOSs, and relates to the field of optical communication. The multi-port TBWSS comprises a 1*N TBWSS device and an optical fiber collimator array set composed of N optical fiber collimation arrays. Each optical fiber collimation array is provided with an input port and M output ports. The TBWSS device outputs optical signals to the input ports of the optical fiber collimation arrays, and the optical signals output through the optical fiber collimation array set are converted by polarization converting units into light in the same polarization state. Light spots projected to a raster in the X direction are large enough through a first cylindrical lens in the X direction and a second cylindrical lens in the X direction, the light with different wavelengths is diffracted through the raster, and diffracted light beams at different angles in the X direction are collimated by a third cylindrical lens in the X direction to be projected to the LCOSs; light beams in the Y direction pass through a cylindrical lens array in the Y direction and then are collimated through the third cylindrical lens in the X direction to be projected to the LCOSs. According to the multi-port TBWSS, the number of the output ports of the single TBWSS is increased, and the system power consumption and the cost are reduced.

The invention provides a motor-pump-integrated micro high-speed magnetic pump which comprises a pump shell, an impeller, a motor shell, a stator winding, a spacer bushing, a motor cover plate, a driving circuit board, a magnetic rotor and a permanent magnet. An annular groove is formed in the outer surface of a rear cover plate of the impeller, the permanent magnet is fixed in the annular groove, axis position of the rear cover plate of the impeller is fixedly connected with the spacer bushing, the space bushing, the motor shell and the motor cover plate form a closed space, the stator winding and the driving circuit board are positioned in the closed space, the stator winding surrounds the permanent magnet by one circle, the back of the pump shell is provided with a connecting portion connected with the motor shell, and the motor shell is fixed on the connecting portion. The pump shell integrates a pump cover plate and a connecting device connected with a motor, and a static component of the motor is connected with the pump shell; the permanent magnet of the impeller forms the magnetic rotor of the motor, so that transmission parts are reduced, size and weight of the micro magnetic pump are reduced, and motor-pump integration is realized.

The invention relates to a three-dimensional graphene and nanometer titania composite photocatalyst and a preparation method thereof. The method comprises the following steps that 1, a 1.0 mg / mL-10.0 mg / mL aqueous graphene oxide solution is prepared; 2, nickel foam is taken and soaked in the aqueous graphene oxide solution, ultrasonic treatment is conducted, a nickel foam material loaded with graphene oxide is prepared, the material is dried, and a three-dimensional graphene oxide material is obtained; 3, haloid acid and titanium tetrachloride are sequentially dissolved in absolute ethyl alcohol, the three-dimensional graphene oxide material obtained in the second step is soaked in the solution, a reaction is conducted under the condition of 100 DEG C to 200 DEG C, heat preservation is conducted for 1 h to 6 h, cooling, separating, cleaning and drying are conducted, and the three-dimensional graphene and nanometer titania composite photocatalyst is obtained. The method inhibits lamination and irreversible agglomeration of graphene in the preparation process and greatly increases the specific surface area of graphene and the electron transmission rate, the size and morphology of obtained nanometer titania are controllable, and the photocatalytic effect of the photocatalyst is improved.

An adjusting device of a microwave antenna comprises a supporting member hinged via a first hinge shaft and a mounting member for connecting the microwave antenna, wherein, the supporting member is equipped with a first worm. The adjusting device also comprises a first worm wheel cooperated with the first worm and fixed with the mounting member, the rotary axis of the first worm wheel is overlapped with the axis of the first hinge shaft, and the adjusting device also comprises a first driving device for driving the first worm. The adjusting device drives the mounting member to rotate relative to the supporting member via a worm and worm wheel mechanism so as to drive the microwave antenna to rotate connected with the mounting member, being simple in operation. And the worm and worm wheel mechanism is in linear transmission, the position adjustment of the microwave antenna is a linear adjustment, and the change of the microwave signal is continuous, has no jumping and is high in adjustment precision. In addition, the adjustment of the worm and worm wheel mechanism is stable, relative to a threaded rod driving in the prior art, the scheme does not employ a threaded rod, and does not need to process an excessive through hole, thereby avoiding a signal compulsion generated by fastening bolts at the two sides of the excessive through hole.

The invention provides a drum type cullet cleaning system and relates to an industrial cleaning system. Through designing a drum, an internal spiral lifting and propelling device and a spraying device, the cullet cleaning system provided by the invention is green and environment-friendly and is thorough in cleaning. The drum type cullet cleaning system comprises the drum, an internal spiral propelling device, a material lifting board, a high-pressure circulating water spraying pipe I, a high-pressure circulating water spraying pipe II, a plurality of spraying nozzles, a water pump, a material inlet, a material outlet, an annular toothed ring, a circular track I, a circular track II, a drum bracket, a carrier roller, a water collecting sump, a flow guiding groove, a precipitating overflow tank impurity zone and a precipitating overflow tank clean water zone, wherein the internal spiral lifting and propelling device comprises the internal spiral propelling device and the material lifting board and is used for providing axial and circumferential tumbling motion for a material to be cleaned; and the spraying device comprises the high-pressure circulating water spraying pipe I, a plurality of spraying nozzles of the high-pressure circulating water spraying pipe I and the high-pressure circulating water spraying pipe II and is used for providing circulating spraying water with certain pressure for the material to be cleaned, and the circulating spraying water forms a specific spray cleaning area through the spraying nozzles of the spraying pipe I.

The invention relates to a substrate integrated multi-mode filter which is based on a square high-order mode cavity, the upper surface and the lower surface of a medium substrate (1) are respectively coated with an upper surface metal (7) and a lower surface metal (8), a metalizing through hole array (2) penetrates the medium substrate (1), the upper surface metal (7) and the lower surface metal (8); a first inductive column (3) and a second inductive column (4) which can play the roles of regulating the eigenfrequency of different modes and coupling between the modes are positioned in a square cavity which is surrounded by the metalizing through hole array (2); a first metal column inductive window (7) and a second metal column inductive window (8) are respectively arranged on the adjacent two sides of the square cavity, the cavity can realize the coupling of the input and the output of energy by metal column inductive windows; a first metalizing through hole array (5) and a second metalizing through hole array (6) are respectively positioned at the first metal column inductive window (7) and the second metal column inductive window (8) to be corresponding to the input and the output of the cavity of the filter, which are connected with an external circuit.

The invention relates to a bus skeleton. The bus skeleton comprises a front wall, a back wall, a left wall, a right wall and a top wall, wherein the front wall, the back wall, the left wall, the right ball and the top wall are combined to form a cuboid bus skeleton. The bus skeleton has the following advantages: the bus skeleton adopts an all-aluminum structure to largely reduce the body weight. A stand column 1 and a stand column 2 of the bus skeleton both extend to the outer sides to take arc shapes, so that the outline is more smooth, and the product beauty is enhanced; a strengthened structure of the bus skeleton can improve the stability of the front wall; a triangular structure enables the structural strength of the front wall to be further enhanced; a protection structure of the bus skeleton can improve the safety; three edges of a rectangular frame B of the bus skeleton are all arched, so that the outline is more smooth, and the product beauty is promoted; and the strengthened structure of the bus skeleton can improve the stability of the front wall.

The invention relates to a generator rotor protective ring blocked type insulating cylinder structure, comprising a generator rotor insulating ring, a high strenghth epoxy glass cloth plate, a DDS plate compound four fluorine muslin delaine and an ebonite pin, which is characterized in that, when assembling the blocked type insulating cylinder, only the blocked type insulating cylinder is packaged on the rotor winding, the power plant is on-site exchanged without dismounting the coupling. The invention has advantages of high mechanical strength, good electric insulating performance, reliable operation while manufacturing, assembling or dismounting conveniently, can allow the coil freely telescopic and reduce the cost and the production cycle.

The invention relates to a pre-twisted anti-slip damping spacer bar. It includes a bracket and a wire clip, the wire clip is arranged at the end corner of the bracket for connecting the split wire, and the wire clip also includes a pre-twisted wire; the head end of the wire clip used to connect the split wire is hook-shaped, The back of the hook is provided with a positioning structure for positioning the pre-twisted wire; the tail end of the clamp is connected to the corner of the bracket through a damping and limiting device. The invention can be installed by bare hands, has the advantages of convenient installation, good reliability and easy control of installation quality.

The invention discloses a positioning device for wall hanging pieces of flat-panel televisions, comprising a wall hanging fixed mount capable of being fixed on wall, a wall hanging connecting mount capable of being fixed with the flat-panel television and a limit button, wherein the limit button is movably locked between the wall hanging fixed mount and the wall hanging connecting mount and is produced by elastic materials. The wall hanging connecting mount is embedded on the wall hanging fixed mount, the bottom of the wall hanging fixed mount is equipped with a supporting plate which is used to support the wall hanging connecting mount, the bottom of the wall hanging connecting mount is equipped with a bottom plate which is used to match the supporting plate laid on the wall hanging fixed mount, the limit button is movably blocked on the bottom plate of the wall hanging connecting mount, the limit button is equipped with a draw-in gear which can rotate transposition between locking position and unlocking position under external force, and the draw-in gear in the locking position is pushed against the bottom surface of the supporting plate of the wall hanging fixed mount. After employing the structure, the flat-panel television after being installed is moved in chain, which can be prevented effectively, simultaneously, the invention has the advantages of fine positioning effect, fine operating performance and being unlimited by small wall hanging installation space.

The invention discloses an internal-expanding type beveling machine. The internal-expanding type beveling machine comprises a long inner central spindle, a short inner central spindle, an outer central spindle sleeve, a main shaft sleeve and a shell. The long inner central spindle and the short inner central spindle are embedded into the outer central spindle sleeve, the outer central spindle sleeve is sleeved with the main shaft sleeve located inside the shell, and trapezoid threads are arranged on the external surface of the rear of the outer central spindle sleeve, wherein a guiding groove is formed in the middle and the rear of the outer central spindle sleeve. At least three inclined guiding grooves are formed in the end, backing on to the long inner central spindle, of the short inner central spindle, and an expanding wedged block is inserted into the inclined guiding grooves. A cutter head base is arranged on the front end face of the main shaft sleeve, a tool disc is fixed to the front end face of the cutter head base, a pushing nut is connected with the external surface of the long central spindle sleeve through threads and makes contact with the rear end face of a rear end cover, the rear of the rear end cover is sleeved with the front of the pushing nut, the pushing nut is connected with the rear end cover movably through a groove and balls, and a curved surface handle is fixedly installed at the rear of the pushing nut. Automation of a steel tube punching beveling machine is achieved, and the internal-expanding type beveling machine is simple in structure and convenient to operate, and cuts steel tube inner and outer beveled edges at a time.

The invention relates to the technical field of pipe machining, and discloses a plastic pipe port flanging process. The plastic pipe port flanging process comprises the technological flows of: (S1) clamping of a plastic pipe; (S2) arrangement of the heating device; (S3) arrangement of the flanging device; (S4) heating of a pipe port; (S5) flanging molding; and (S6) cooling and surface treatment. Compared with the prior art, the plastic pipe port flanging process changes a heating mode to heating from internal of plastic, so that the heating becomes more uniform, the uniform heating of the inner wall and the outer wall of the pipe port is realized, the softening effect is better, and the breakage of the pipe port in reflanging is prevented.

The invention belongs to the technical field of pump station intelligent operation management, and particularly discloses a wide-area and large-scale urban drainage pump station unattended system and a construction method. The system comprises an information collection part, an information transmission part, an automatic control part, an alarm processing part and a middle and high-grade manual intervention part. According to the invention, unattended management of drainage management of wide-area and large-quantity cities can be realized, and manpower resource deployment of pump station management can be greatly saved; management functions of a pump station layer, a branch monitoring center management layer and a total monitoring center management layer are classified and clarified, so that management stacking can be avoided, and the management efficiency is improved; information collection is comprehensive, information of an equipment system, an instrument system and a video monitoring system is completely collected through an automatic control system, and the system is a basic support for unattended operation of a pump station; and video images are transmitted to a video cloud platform through a public network, branch monitoring centers and a main monitoring center can conveniently call and watch the video images, the video cloud platform adopts a renting mode, investment is saved, and maintenance is convenient.

The invention discloses a rigidity-adjustable water lubricating stem bearing. The stem bearing comprises a bearing sleeve, bearing supports and rigidity-adjustable bearing bushes. Each rigidity-adjustable bearing bush is of a flexible structure with an airtight cavity. The rigidity-adjustable bearing bushes are fixedly connected in the bearing sleeve through the bearing supports. The rigidity-adjustable bearing bushes are distributed in the circumferential direction of the bearing sleeve. The surfaces of the rigidity-adjustable bearing bushes are higher than the inner diameter surface of the bearing sleeve. A flow partition water groove is formed between every two adjacent rigidity-adjustable bearing bushes. The rigidity-adjustable bearing bushes can be used for adjusting the rigidity of the bearing in the manner that high-pressure gas is changed in and discharged from the airtight cavities of the rigidity-adjustable bearing bushes. By means of the rigidity-adjustable water lubricating stem bearing, the problems that the maintenance period is long and the maintenance workloads are large when an existing water lubricating stem bearing is replaced or maintained, and the rigidity of the water lubricating bearing cannot be adjusted to adapt to vibration of a stem shaft system can be solved.

The invention relates to a novel aluminum alloy transmission shaft. The transmission shaft comprises an aluminum alloy shaft pipe, one end of the aluminum alloy shaft pipe is provided with an aluminumalloy universal joint fork, the other end of the aluminum alloy shaft pipe is provided with an aluminum alloy spline sleeve, and an integral structure is formed; the aluminum alloy universal joint isconnected with a second flange fork through a second cross shaft, and the aluminum alloy spline sleeve is matched with a spline shaft fork and connected with a first flange fork through a first crossshaft; the aluminum alloy spline sleeve and the spline shaft fork are matched with each other to form a spline pair, a sheath is arranged outside the spline shaft fork, the junction between the aluminum alloy spline sleeve and the spline shaft fork is covered by the sheath, and a maintenance-free sheath oil seal is arranged between the sheath and the aluminum alloy spline sleeve to make the spline pair to form a maintenance-free structure; splines and the outer circle of the aluminum alloy spline sleeve are provided with nylon coating layers, and the thickness of each nylon coating layer is 0.2-0.4 mm. By using the maintenance-free structure, the service life is prolonged, maintenance is not needed, and the cost is saved. Through the arrangement of the nylon coating layers, the transmission shaft has a self-lubricating system, and a better scheme is made for maintenance-free.

The invention discloses a graphene-loaded nickel magnetic composite material preparation method which comprises the following steps: selecting a single-layer or few-layer oxidized graphene water solution to pre-freeze the oxidized graphene water solution until the oxidized graphene is completely frozen; performing vacuum freeze drying on the frozen oxidized graphene water solution to make moisturein the solution sublimate into air from ice; evenly dispersing the vacuum-freeze-dried oxidized graphene into ethylene glycol, sequentially adding nickel acetate and hydrazine hydrate, simultaneouslyadding a sodium hydroxide solution to adjust a PH to 13, then pouring an ultrasonically-treated mixed solution into a microwave high pressure reaction kettle, utilizing the hydrazine hydrate as a reducing agent and performing thermal insulation under the microwave condition; utilizing a suction filtration method for wash the reacted solution to obtain precipitate and washing and drying to preparea graphene-loaded nickel magnetic composite material. The graphene-loaded nickel magnetic composite material prepared by the method disclosed by the invention has the characteristics of small density, large coercive force, high saturation magnetization and large magnetic area.

The invention discloses an integrally mounted mechanical seal device. The integrally mounted mechanical seal device comprises a shaft sleeve, wherein a first seal component and a second seal component sleeve the shaft sleeve, the first seal component comprises a first moving ring and a seal sleeve, the seal sleeve sleeves the first moving ring, the second seal component comprises a second moving ring and a mechanical seal sleeve, the mechanical seal sleeve is arranged outside the second moving ring, a first fixed ring and a second fixed ring are respectively arranged at the two ends of the mechanical seal sleeve, the end portion of the first moving ring is fit with the end portion of the first fixed ring, the end portion of the second moving ring is fit with the end portion of the second fixed ring, and a cooling chamber is arranged in the second seal component. During use, an operator only needs to tightly screw screws into the mechanical seal sleeve and equipment and the installation is facilitated; the first seal component is located inside the equipment, the second seal component is located outside the equipment, friction heat in the first seal component is dissipated through materials, friction heat in the second seal component is dissipated through cooling liquid, the heat dissipating effect is better and the service life of the mechanical seal device is prolonged.

The invention provides a wake flow bubble detection optical system which comprises a piece light source, a front set lens and rear set lenses. The rear set lenses are connected with a switching mechanism. The piece light source and the front set lens are placed in a same light path, the number of the rear set lens is multiple, and the rear set lenses are switched through the switching mechanism to enable one set of rear set lens and the front set lens to be correspondingly placed in the same light path. The wake flow bubble detection optical system can achieve subsection shooting of 10-500 micrometers, and small bubbles in wake flow larger than or equal to 10 micrometers can be shot clearly.

The invention provides a cooking appliance. The cooking appliance comprises a body and a stove door assembly. A cavity with an opening is formed by the body. The stove door assembly covers the opening of the body so as to close or open the body. The stove door assembly comprises a door body, the door body comprises a rotation door body and a folding door body which are rotationally connected, the first side edge of the rotation door body makes contact with the second side edge of the folding door body, the rotation door body is rotationally connected to the body, and the rotation axis, relative to the body, of the rotation door body is parallel to the first side edge of the rotation door body or the second side edge of the folding door body. According to the provided cooking appliance, the door body of the stove door assembly is dismounted into the rotation door body and the folding door body which are rotationally connected, the rotation door body is arranged on the body and can be rotationally opened and closed around the body, the folding door body can rotate around the folding door body, and the rotation axes at the two positions are parallel; and accordingly when the stove door assembly is opened, the door body can be folded, and space occupied for door body rotation is reduced.

The invention discloses a metal liner clamping hoop. The metal liner clamping hoop comprises a right clamping piece, a left clamping piece, a liner, a round hole and a square hole, wherein the upper end of the left clamping piece and the upper end of the right clamping piece are bent and fixedly connected in a spot welding mode, the round hole is formed in the tail end of the right clamping piece, the square hole is formed in the tail end of the left clamping piece, and the tail end of the right clamping piece and the tail end of the left clamping piece are connected and fixed in the mode that a nut penetrates through the round hole and the square hole. According to the metal liner clamping hoop, a body is composed of the right clamping piece and the left clamping piece so that a complete arc can be formed conveniently when the metal liner clamping hoop is closed, and an opening of the metal liner clamping hoop can be annularly closed. According to the structure, the metal liner clamping hoop is large is clamping force, the frequency of relative displacement between the clamping hoop, a cable and a pipe is reduced, movement is prevented, a metal liner is arranged on the inner side of the arc and has very good high-temperature resistance performance; the metal liner clamping hoop has the advantages of being light in weight, good in shock absorbing performance and good and reliable in property.

The invention relates to a mute barbell roller bearing which has a structure support technology that is characterized in that the external dimension standard of the mute barbell roller bearing is in line with the technical standard of an international general roller bearing of international standardization organization (ISO). The mute barbell roller bearing is formed by correspondingly matching an inner sleeve ring formed by two separated rings 1, a row of barbell rollers 3, an outer sleeve ring 2 and an invisible retainer 4. The invention aims at solving the technical problem that the traditional N-type series cylindrical roller bearing is not capable of thrusting. The mute barbell roller bearing has the most remarkable selling points that (1) the dynamic flexibility is improved by 20%; (2) the jump noise is reduced by 5-14 decibels (dB); (3) the rotating speed is accelerated by 12-30%; (4) the loading capacity is increased by 30-50%; (5) the safety factor is increased by 2%; (6) a sealing cover can be arranged on the mute barbell roller bearing; (7) axial thrust capability is improved by 70%; and (8) the servo life is prolonged by 14-30%, therefore, the mute barbell roller bearing is a three generation leading edge innovative technology product which is economical and environment-friendly.