30results about How to "Axial movement is smooth" patented technology

The invention discloses a differential type pilot overflow valve to overcome the defects that impact between a pilot valve core and a pilot valve seat in the conventional pilot overflow valve is large, and the conventional pilot overflow valve is easy to damage, short in service life and large in noise. According to the pilot overflow valve, a differential pilot valve is arranged in a pilot valve cavity; the inner side of the pilot valve is provided with a first accommodation cavity which is communicated with an oil inlet, and the outer side of the pilot valve is provided with a second accommodation cavity communicated with the first accommodation cavity through a throttling hole; the pilot valve core is arranged in the pilot valve seat, and a sealing cone of the pilot valve core is positioned in the first accommodation cavity and is connected with a first buffer spring; the side of the second accommodation cavity is provided with a pressure regulating spring connected with the pilot valve seat; and a pilot valve gap, a radial through hole and an oil outlet between the pilot valve seat and the pilot valve core form a pilot valve opening leakage oil channel. By the damping effect of the differential pilot valve, the inverse pilot valve core, the buffer spring, the axial movable pilot valve, the pilot valve core and the pilot valve gap, the impact force generated when the pilot valve is opened can be reduced, and the pilot valve core is always in the stable state, so that the overflow valve has the advantages of small impact, long service life, stability and low noise.

The invention provides a retracting and releasing mechanism of a binding device and belongs to the technical field of logistics binding equipment. The retracting and releasing mechanism of the bindingdevice solves the problem that a binding device in the prior art is not high in switching efficiency and smoothness degree in the switching process for retracting and releasing a binding belt. The retracting and releasing mechanism of the binding device comprises a worm gear connected to a binding device reel and synchronously rotating with the reel; a shell of the binding device is provided witha worm; a clamping claw located on the side portion of the worm is hinged to the shell, and is provided with lifting clamping teeth capable of being embedded into a tooth groove of spiral teeth so asto guide the worm to move in the axial direction when the worm rotates; when the worm moves in the axial direction from the state that the worm is engaged with the worm gear to the state that the worm disengages from the worm gear, the lifting clamping teeth can be ejected and pushed by the spiral teeth so that the clamping claw can swing in the direction away from the worm; and the amplitude ofswinging of the clamping claw in the direction away from the worm can make the lifting clamping teeth higher than a tooth crest of the spiral teeth. The retracting and releasing mechanism of the binding device has the beneficial effect that the swinging process for retracting and releasing the binding piece is fast and smooth.

The invention discloses an arrow-shaped check valve comprising an upper valve body and a lower valve body. The upper valve body and the lower valve body are both provided with through holes. A fixingseat is arranged in the lower valve body. A valve element is arranged on the fixing seat. The arrow-shaped check valve is characterized in that the lower end of the valve element and the fixing seat are axially and slidably connected through an axial sliding mechanism, a circulating hole structure is arranged at the upper end of the valve element, a sealing mechanism is arranged on the lower portion of the circulating hole structure, the upper end of the valve element is matched with a sealing hole formed in the upper valve body, the sealing mechanism and the sealing hole are matched in a sealed mode, and a liquid flow channel structure is arranged on the fixing seat. The arrow-shaped check valve has the advantages of compact structure, convenient mounting and demounting, long service lifeand the like, the circulating hole structure is arranged at the upper end of the valve element, the circulating area of well drilling fluid in an inner cavity of the check valve is increased under the premise that the external dimension of the arrow-shaped check valve is not increased, the energy loss is reduced, and the work efficiency is improved.

The invention discloses a brake hub honing head with an improved structure. The brake hub honing head comprises a jacket, a regulating mandrel, at least one grinding stick holder, an ejector pin and a grinding stick, wherein the regulating mandrel can rotate in the circumferential direction, and can flexibly move and be located in the jacket in the axial direction; the grinding stick holder is arranged at the outer side of the jacket; a radial through hole is formed in the side wall of the jacket; the ejector pin is movably inserted in the through hole, the outer side wall of the regulating mandrel is pressed against by one end of the ejector pin, and the inner side wall of one end of the grinding stick holder is tightly pressed by the other end of the ejector pin; the grinding stick is fixedly arranged on the outer side wall of the grinding stick holder; the outer side wall of the regulating mandrel takes the shape of a conical surface, and the outer diameter of one end of the conical surface is gradually decreased; and the other end of the grinding stick holder is connected with the outer side wall of the jacket in a hinging way. According to the invention, the grinding stick holder is driven by the outer side wall of the regulating mandrel to make radial deflection motion through the ejector pin, and the honing head takes the shape of a conic structure during grinding, so that the sufficient grinding of the bottom end edge of a blind hole of a brake hub can be guaranteed, the cylindricity of the bottom end of the blind hole of the brake hub can be guaranteed, and the brake hub is enabled to be more stable and durable in the work process.

The invention relates to a prefabricated part gantry hoisting device and a using method. The prefabricated part gantry hoisting device comprises two tracks, supporting stand columns, a connecting cross beam, a hoisting rod, a top derailing prevention device and a bottom derailing prevention device. The two tracks are arranged in parallel; the supporting stand columns comprise the left supporting stand column and the right supporting stand column; the left supporting stand column and the right supporting stand column are identical in structure; the bottom of the left supporting stand column and the bottom of the right supporting stand column are movably arranged on the tracks through the bottom derailing prevention device correspondingly; the top of the left supporting stand column and the top of the right supporting stand column are connected through the connecting beam; the left supporting stand column, the connecting beam and the right supporting stand column jointly form a portal frame; the portal frame slides in the axial direction of the tracks; and the hoisting rod is arranged on the connecting cross beam through the top derailing prevention device and moves in the axial direction of the connecting cross beam. According to the prefabricated part gantry hoisting device and the using method, the height of the portal frame can be adjusted, and using is safe and reliable.

The present invention discloses a method for controlling temperature of a water path and a temperature control device using the method. The temperature control device comprises a housing provided with a water inlet passage, a water return passage and a water outlet passage; a switching valve provided with a sealing part and a sliding part disposed at two sides of the water inlet passage, a cross sectional area of the sliding part being larger than that of the sealing part; a temperature sensing rod of which two ends are provided with a heated part and a stretching part; and a valve assembly connected with the stretching part. When cold water enters into the water inlet passage, the switching valve, under the action of water pressure, moves in an axial direction towards a first direction to close the water outlet passage, and the cold water is drained from the water return passage; when warm water enters into the water inlet passage, the valve assembly closes the water return passage, the switching valve opens the water outlet passage, and the warm water is drained from the water outlet passage; and when hot water enters into the water inlet passage, the vavle assembly reopens the water return passage, and the hot water is drained from the water return passage. The temperature control device provided by the present invention can automatically return water whose temperature is lower or higher than a temperature set value, and is thus convenient to use.

The invention provides a switching valve for charging and discharing food, which can conveniently realize CIP cleaning without adding a sealing element between the valve body and the valve core. The switching valve comprises a valve body and a valve core, wherein the valve body is provided with a discharge port and a feed port; the valve core is provided with a switching connecting port aiming at the discharge port and the feed port; the valve body is around the discharge port and the feed port, and the valve core adopts seal fit with ceramic materials, so that the material is cut off in the valve body; and the valve core can rotate and axially slide. Due to the adoption of the technical scheme, the seal between the valve core and the valve body can be ensured only by dimensional precision, and the material can be cut off and sealed without adding the sealing element. Owing to the stability and small thermal deformation coefficient, the heated ceramic material can not result in the failure of the valve body and the valve core to rotate and axially slide due to excessive thermal expansion, so that the valve body and the valve core can steadily, easily and axially move to the cleaning place for cleaning the CIP.

The telescope for the level gauge for power construction comprises a main lens cone extending longitudinally front and back, an objective lens is arranged at the front end of the main lens cone, and an ocular lens is arranged at the rear end of the main lens cone; the distance adjusting barrel is coaxially and axially arranged in the middle of the inner cavity of the main lens barrel in a sliding manner, and an inverted image lens group is arranged in the distance adjusting barrel; a dragging plate which is horizontally arranged front and back is fixed at the front end of the distance adjusting cylinder; the reticle is arranged in the main lens barrel and is close to the eyepiece from the front side; the long bubble type level is fixed on the main lens cone; the shaft is horizontally arranged on the side wall of the main lens cone left and right, one end of the shaft extends into the inner cavity of the main lens cone and is in friction connection with the dragging plate, and the shaft is rotatably arranged on the main lens cone. According to the telescope for the level gauge for power construction, the shaft is in friction connection with the dragging plate fixed at the front end of the distance adjusting cylinder, so that the distance adjusting cylinder is driven to move axially, and the distance adjusting cylinder can move stably in the axial direction through friction transmission.

The invention discloses a valve needle assembly, a valve rod, an electronic expansion valve and refrigeration equipment. The valve needle assembly comprises a valve needle, a valve needle sleeve and the valve rod, the valve needle sleeve is provided with a first opening end and a second opening end which are opposite, and the valve needle is installed at the second opening end; the valve rod comprises a threaded rod section in threaded fit with a nut and a driving rod section connected with the threaded rod section, and the driving rod section is movably matched with the valve needle sleeve through the first opening end to drive the valve needle to act; a flange part is arranged on the peripheral wall of the driving rod section, and the flange part is in limiting fit with the valve needlesleeve to limit the driving rod section from being disengaged from the first opening end; the ratio of the outer diameter of the flange part to the length of the threaded rod section is larger than orequal to 0.4 and smaller than or equal to 0.6. According to the valve needle assembly, the valve rod can be prevented from being stuck in the moving process, it can be guaranteed that the valve rod smoothly moves in the axial direction of the valve rod, and therefore the use performance of the electronic expansion valve is improved.