32results about How to "No turning phenomenon" patented technology

A multifunctional orthodontic appliance comprises a plurality of sets of fixing assemblies and arch wires connected with the fixing assemblies, two ends of each arch wire are connected with the corresponding fixing assembly, the fixing assemblies and the arch wires are arranged at intervals, and the two ends of each arch wire are fixedly connected with clamping blocks; each fixing assembly comprises a top cover, a bottom plate, a connecting pad, a limiting plate, a limiting piece, a connecting base, a connecting block, a first fastener, a second fastener, a clamping plate, a connecting rod anda first bolt. For each fixing assembly, the bottom end of the top cover is connected with the upper end face of the bottom plate, a limiting groove used for installing the limiting plate is formed inthe lower end face of the bottom plate, the connecting pad is fixedly installed on the lower end face of the limiting plate and fixedly connected with the bottom plate through a third bolt, the top cover is fixedly connected with the bottom plate through a second bolt, and a cavity is formed in the top cover. The multifunctional orthodontic appliance has the advantages of being reasonable in design and convenient to adjust.

The invention discloses a method for measuring an air specific heat ratio by vibration of a piston in a single-end sealed vertical cylinder. A horizontal bubble is arranged at the upper end face of the outer side of a cylinder with internal diameter r, an air hole and a millimeter dividing ruler are arranged at the vertical side surface of the cylinder, the cylinder is vertically fixed on a bracket; a sealing piston is arranged inside the cylinder, a metal half-sphere is fixed at the lower end of the piston, the symcenter of the outer surface of the half-sphere is fixed with one end of a pull rod, the other end of the pull rod is fixed with a pull ring; an air hole is opened, the piston is pushed into any position inside the cylinder by virtue of the pull rod, then a sealing cap of the air hole is sealed, the pull ring at the tail end of the pull rod is pulled, and then immediately released, the piston can vibrate under an elastic function of sealed air; the air specific heat ratio gamma is equal to 4 pi mh/(r<2>T<2>P). The method has the beneficial effects that the air is in a sealed state, the sealed air has good elasticity; an experiment principle is relatively precise; the vibration is strict simple harmonic vibration; the phenomenon of rotation of the prior art can not be caused; no inflating device is needed, the structure is relatively simple and the cost is relatively low.

The invention relates to a method for measuring an air ratio and a heat capacity ratio by vibration of a piston in a single-end sealed cylinder. The transparent cylinder with an internal radius of r comprises two sections; the bottom end of one section is sealed and a pressure sensor is arranged on the one section; a signal wire of the pressure sensor is connected to a digital oscilloscope to measure a vibration period of T; a millimeter graduation ruler and a spirit bubble are arranged on the outer surface of the cylinder in the length direction of the cylinder; the two-position sealed piston with a mass of m and a piston connecting rod are arranged inside the cylinder; the piston connecting rod can be attracted by a magnetic field; one magnet extends into the hollow round tube end of the cylinder and is in contact with the piston, the magnetic field attracts stainless steel of the piston connecting rod, then the piston connecting rod is pulled towards the open end of the cylinder, and when the magnetic field force is smaller than a force generated by air pressure difference, the two-position sealed piston is separated from the magnet and vibrates and a meter measures an atmospheric pressure value P of the air; the air ratio and the heat capacity ratio are calculated according to the formula gamma=4pimh/(r<2>T<2>P). The method has the benefits that the sealed air has excellent elasticity; the experiment principle is more rigorous; vibration in the method is strict simple harmonic vibration; the rotating phenomenon cannot be generated; a vibration starting method is simple and easy to operate; a structure is simpler and cost is lower.

The invention discloses a method for measuring an air specific heat ratio via vibration of a drumhead object. The method comprises the following steps: covering a layer of elastic rubber at the opened end of a cylinder to form a drumhead, one end of which is opened, and fixedly adhering a sphere or a semisphere or an axially symmetric solid at the center of the drumhead, wherein the inner diameter of the cylinder is R, the inner height of the cylinder is h, the mass of the sphere or the semisphere is m and air is sealed in the cylinder; pressing the axially symmetric solid and then releasing, wherein the axially symmetric solid vibrates by suffering the elastic force of the elastic rubber of the drumhead and the elastic function of the air; obtaining the air specific heat ratio gamma which is equal to [(2pi/T)2-k/m]*3m*h/(piR2P), wherein k is the elastic coefficient of the rubber drumhead, the circumference to diameter ratio pi is equal to 3.14159, T is the period of vibration and P is the pressure of the external air. The method disclosed by the invention has the benefits that favorable elasticity is provided as the air is sealed, the experiment principle is more rigorous, a strict simple harmonic vibration is carried out, no rotation occurs, an inflation device is not required, the structure is simpler and the cost is lower.

The invention relates to a novel extruding granulation machine unit. In a device for regulating melt mixing degree of a mixing granulation machine unit, a material runner is arranged in a valve body; a rotatable valve core or a rotatable valve plate are arranged in the material runner and with the difference of a rotation angle, flow area of the valve core or the valve plate is different; the valve core or the valve plate are connected with a driving mechanism through a rotation shaft and the driving mechanism is connected with a reducer by a motor output shaft; the reducer is connected with the rotation shaft of the device for regulating the melt mixing degree. In the novel extruding granulation machine unit, the motor drives the reducer to drive the regulation device and the novel extruding granulation machine unit has a simple and compact structure, less parts; a diction function is brought into play by an angular displacement sensor fixed on the end of the shafts. As the motor can realize positive and reverse rotation, the angle can be changed at any time, which means the melt mixing degree can be changed with the advantages of timely and simple control. The reducer directly connected with the motor adopts a worm gear form to effectively realize self-locking and accurate location as well as avoid the rotation of the valve core caused by the material.

The invention relates to the field of bearing production, in particular to a special fixture for a cylindrical bearing retainer, which comprises a clamping seat, a pushing part is mounted in the middle of the upper end of the clamping seat, a clamping part is connected to the end part of the pushing part, an ejection part is mounted at the edge of the upper end of the clamping seat, and the axis of the ejection part and the axis of the clamping part are collinear. Mounting holes are formed in the corners of the upper end face of the clamping base in a penetrating mode, and the ejecting piece is connected with the pushing piece. According to the holder clamping device, the convenience degree of holder clamping can be improved, it can be guaranteed that more labor is saved during clamping, and the protection force on the holder during clamping and the clamping stability can be improved.

The invention provides a method for measuring air specific heat ratio through the adoption of the vibration method, relates to measurement of physical constant and overcomes problems existing in the conventional technology. The technical scheme adopted by the method is as follows: a cylinder with a sealed upper end and an opened lower end is provided, wherein a spirit bubble is arranged in the plane surface on the outer side of the upper end surface; one or more air holes are formed in the upper part on the side surface of the cylinder and can be sealed through sealing nuts; the cylinder is vertically fixed on a support; a spring is connected between the plane surface at the upper end on the inner side of the cylinder and a piston; the upper end of a suspension line is fixed to the center of the lower end face of the piston; a heavy object is tied to the lower end of the suspension line; when the air holes are open, the vibration period T1 of the heavy object equals to 2Pi(m/k)<0.5>; when all the air holes are sealed, the vibration period of the heavy object is T and the air specific heat ratio gamma equals to 4Pimh(T1<2> minus T<2>)/(r<2>PT<2>T1<2>), wherein Pi is the ratio of the circumference of a circle to its diameter, m is the quality sum of the piston and the heavy object, k is the elastic coefficient of the spring, P is the pressure of the sealed air and r is the inner diameter of the cylinder. The method has the benefits that the sealed air is elastic, the experiment principle is stricter, strict simple harmonic vibration is realized, rotation is avoided and the device is simpler in structure and lower in cost.

The invention provides an oil pipe. The oil pipe comprises a first oil pipe, a second oil pipe, a connector, a first groove, a projection and an anti-rotation body, wherein the first oil pipe and the second oil pipe longitudinally extend, the connector is provided with a first end and a second end which are opposite, the first end is used for being connected with the first oil pipe, the first groove recessed from the end face of the second end to the first end is formed on the side wall of the connector, the projection protrudes out of the side wall of the second oil pipe and is provided with a first operating surface and a second operating surface which are opposite in the circumference of the second oil pipe, a notch is formed by the first operating surface, the second operating surface and the side wall of the second oil pipe adjacent to the first operating surface and the second operating surface; the anti-rotation body can be received in the first groove and the notch. By the oil pipe, the purpose for preventing rotation of the oil pipe at the joint is achieved.

The invention discloses a steel pipe clamp of a drainage discharge pipe. A pipe clamp main body is formed by an upper half-annular pipe clamp body and a lower half-annular pipe clamp body, the upper half-annular pipe clamp body and the lower half-annular pipe clamp body having left and right turning-out connecting plates and connecting bolt holes. Two sides of a pipe clamp are connected by bolts and are in a closed annular shape. The connecting plate is a round ring without a landing edge. Positioning holes are uniformly distributed on the pipe clamp main body. One end of the pipe clamp main body is provided with a pinch plate. The size of the pinch plate is consistent with the size of the positioning hole. A flexible rubber plate of the pipe clamp main body is adhered on the upper part ofan arc surface of the connected round ring. A clamping limiting plate is arranged on the flexible rubber plate. The clamping limiting plate is arranged on a single-board pull rod with synchronous teeth. The steel pipe clamp can synchronously contract with a drainage pipe, and has relatively high tensile strength (tear resistance), and connection is reliable. The flexible rubber plate can make thenovel steel pipe clamp would not rotate in a whole loading and unloading working process. The steel pipe clamp can improve working efficiency, and is convenient in operation, low in investment cost,and tightness degree of the pipe clamp can freely adjusted, and fixation effect is good.

The invention discloses a stainless steel plate spring clamp. The stainless steel plate spring clamp comprises a U-shaped clamp body and a fixing device, wherein the fixing device comprises a rear sealing base, a stress rod and attaching plates, one end of the stress rod is fixedly installed on the front side of the rear sealing base, and reinforcing flat plates are fixedly installed at the positions, located on the two sides of the stress rod, of the front side of the rear sealing base; the reinforcing flat plates are fixedly connected with the stress rod, strip-shaped rotating grooves are formed in the bottoms of the attaching plates, supporting strips are fixedly installed at the tops of the reinforcing flat plates, rotating rods are fixedly installed at the tops of the supporting strips, the rotating rods are installed in the strip-shaped rotating grooves, arc-shaped circular grooves are formed in the tops of the reinforcing flat plates, springs are fixedly connected to the inner side walls, away from the opening ends, of the arc-shaped circular grooves, and arc-shaped rods are fixedly connected to the bottoms of the attaching plates. The stainless steel plate spring clamp is reasonable in design, long in service life and capable of effectively reducing the possibility of loosening.

The vacuum type cinerary casket comprises a shell with a bottom and an air exhaust nozzle with a one-way valve, the shell and the air exhaust nozzle are integrally formed in a stamping mode, two outwards-sunken device tables are arranged at the symmetrical positions of the side wall of the shell, and an annular folded plate is fixedly arranged on the inner wall of the upper end of the shell; a soft airtight ring is arranged at the bottom of the annular folded plate between the annular folded plate and the shell in a contact mode, an air pressure cover is arranged on the inner wall of the upper end of the shell, and downward bent rings are fixedly arranged on the edges of the inner wall and the outer wall of the air pressure cover and connected between the annular folded plate and the shell through threads in a threaded mode. Threads used for keeping internal and external balance when the bending ring moves downwards are arranged on the contact faces of the annular folding plate, the shell and the bending ring. According to the vacuum cinerary casket, the problems that an upper end sealing device is directly pressed on a sealing ring under the maximum pressure before an existing vacuum cinerary casket is vacuumized, so that the sealing ring is overloaded, the sealing effect is poor, even the sealing ring is directly broken, and sealing fails are solved.

The invention relates to automatic household fan assembling equipment which comprises a bottom plate, a moving device, a clamping device, a positioning device and a jacking device. The moving device is installed at the left end of the bottom plate, the clamping device and the positioning device are installed on the moving device, and the jacking device is installed at the right end of the bottom plate. According to the automatic household fan assembling equipment, the following problems existing when an existing electric fan base plate and an electric fan base supporting rod are assembled can be solved, firstly, when the traditional electric fan base plate and the electric fan base supporting rod are assembled, an electric fan base needs to be manually clamped and positioned through tools, then a tool is used for rotating an electric fan threaded rod into the electric fan base supporting rod, and the manual assembly efficiency is low; and secondly, when an existing electric fan is assembled, the electric fan base plate and the electric fan base supporting rod cannot be stably clamped, consequently the electric fan base supporting rod and the electric fan base plate rotate when being assembled, and the assembling efficiency of the electric fan is influenced.

The invention relates to the technical field of ore screen machining, in particular to a numerical control precise four-stage rolling mill for ore screen machining, which comprises a track, a wire releasing frame and an electric control cabinet, the wire releasing frame, a first-stage rolling mill, a second-stage rolling mill, a third-stage rolling mill and a fourth-stage rolling mill are sequentially mounted at the upper end of the track from left to right, and a rotating shaft is mounted at the upper end of the wire releasing frame through a bearing seat. A plurality of round rods are fixed to the outer wall of the rotating shaft, overspeed prevention assemblies are installed at the outer ends of the round rods correspondingly, a rotating disc is fixed to the top end of the rotating shaft, a ratchet ring is fixed to the outer wall of the rotating disc, a fixed shaft is fixed to the upper end of the rotating disc, a circular ring block is further fixed to the upper surface of the wire releasing frame, and a plurality of pawls are hinged to the inner wall of the periphery of the circular ring block. The back faces of the pawls abut against leaf springs. The raw material metal wire can stably enter the rolling mill, and normal wire discharging is ensured; and the rotating disc can only rotate in one direction, and the rotation phenomenon is avoided.

A method for measuring air specific heat ratio by piston vibration in a single-ended sealed horizontal cylinder is disclosed. One end of a transparent cylinder is sealed, and the other end of the transparent cylinder is sleeved with a mesh cap. The mesh cap has a central circular hole. a millimeter calibrated scale and a horizontal bubble are arranged on the outer surface of the cylinder. A piston is arranged inside the cylinder, and two sides of the piston are respectively fixed with a hemisphere. The center of the outer surface of each hemisphere outside the piston is connected with one end of a pull rod, and the other end of the pull rod is inserted into the central circular hole of the mesh cap. A sealing cap of the cylinder is opened, and the pull rod is pushed to push the piston into some position inside the cylinder. Then, the sealing cap is tightly screwed to seal one end of the cylinder, the cylinder is horizontally fixed on a horizontal support frame, and the pull rod is pulled outwards. When the pull rod is released, the piston is vibrated under elastic action of sealed air. Air specific heat ratio gamma is 4 Pi mh/(r<2>T<2>P). The invention has beneficial effects as follows: sealed air has good elasticity; experiment principle is more rigorous; the method is a strict simple harmonic vibration; present technical rotary movement will not happen; an inflation unit is not required; the structure is simpler; and costs are lower.