81results about How to "No direction" patented technology

The invention discloses a manual control and remote control integrated electric fork lift truck, which belongs to the field of electric fork lift truck and comprises an electrically-driven fork lift truck on a working face. The fork lift truck is provided with an operating room; the operating room is provided with a manipulation button which is connected with a control system; and a power supply end of the control system is connected with a power supply cable arranged on the rear part of the fork lift truck. The fork lift truck is characterized in that: the fork lift truck on the working face is provided with a wireless monitoring system and a wireless control system; a terminal operating floor of the wireless monitoring system and the wireless control system are arranged in a work station; and the wireless control system is connected in parallel and mutually locked with the manipulation button in the operating room and then connected with the control system. An operator can monitor the conditions of the working face and control the work of the electric fork lift truck on the terminal operating floor of the work station. When the wireless control system controls the fork lift truck, the manual operation system stops so that the fork lift truck receives only one command; and the fork lift truck operates in a large range and is convenient to control.

The invention provides a reconfigurable optical add-drop multiplexer and a reconfigurable optical add-drop multiplexing method. The reconfigurable optical add-drop multiplexer comprises an optical processing unit and a first output port, wherein the optical processing unit is used for receiving a first optical signal including multiple optical channels and processing the first optical signal to generate a second optical signal; the second optical signal at least comprises a part of one optical channel in the multiple optical channels of the first optical signal; and the second optical signal generated by the optical processing unit is externally output by the first output port. According to the reconfigurable optical add-drop multiplexer and the reconfigurable optical add-drop multiplexing method, any number of dimensionalities can be supported, the adding / dropping and the going to / coming from an optical channel of any broadband and any wavelength in any direction can be realized, and any part of wavelength and any part of the broadband of the optical channel can be output to other external reconfigurable optical add-drop multiplexer nodes so as to meet the demands on colorless, directionless, contentionless and gridless.

The invention relates to a method for manufacturing a light reflecting material mold with a microprism array structure. When the light reflecting material mold with the microprism array structure is manufactured through an existing method, copying and splicing are directly conducted on a metal mold plate, so that the microprism array structure of the light reflecting material mold embodies different reflected light intensities in different directions, and recognition performance of light reflecting material is influenced. The method includes the main steps of engraving a metal substrate to form the microprism array structure so as to form the metal mold plate, using the metal mold plate as a mother board to form a daughter board through copy, cutting the daughter board into a plurality of small boards, rotating the small boards, splicing the small boards into a large board, copying the large board multiple times to form a plurality of large board bodies, splicing the large board bodies one time or multiple times to form a mold plate in a larger size, and completing manufacturing of the light reflecting material mold with the microprism array structure. The light reflecting material mold manufactured through the method and provided with the microprism array structure has the same reflected light intensity distribution characteristic in different directions and has a better light reflecting effect.

The invention relates to a manufacturing method of a flat plate heat pipe. The manufacturing method comprises the following steps of: providing a first metal sheet body; providing a plurality of spherical supporting bodies and a second metal sheet body, wherein the second metal sheet body comprises a base plate and a side plate extending from the base plate; arranging the spherical supporting bodies on the base plate of the second metal sheet; and folding the first metal sheet body and the second metal sheet body, and performing diffusion welding on the first metal sheet body and the second metal sheet body so that the first metal sheet body and the second metal sheet body are in sealing connection with each other, and the spherical supporting bodies are clamped between the first metal sheet body and the base plate of the second metal sheet body and directly pressed against the first metal sheet body and the base plate of the second metal sheet body. The flat plate heat pipe comprises a flat plate shell which comprises a base plate and a top plate opposite to the base plate; and at least one spherical supporting body is clamped between the base plate and the top plate. The supporting bodies in the invention are spherical, easy to manufacture and free of direction, can be conveniently arranged in the shell and easily combined with the shell without falling, so the flat plate heat pipe has stable performance.

The invention discloses a bolt-type connecting piece and a connecting pile. The bolt-type connecting piece comprises a large nut sleeve, a small nut sleeve, an inserted rod and two bolts, one side of the inserted rod is connected with the small nut sleeve, the other side of the inserted rod is sleeved with the large nut sleeve, and an annular groove is formed in the peripheral surface of the portion, sleeved with the large nut sleeve, of the inserted rod; two sets of through holes which are used for being matched with the annular groove formed in the inserted rod are symmetrically formed in the side wall of the large nut sleeve; the two bolts penetrate through the through holes which are formed in the large nut sleeve and the annular groove formed in the inserted rod respectively, and the bolts are used for fixing the inserting rod and the large nut sleeve in a spacing mode. By means of the structural arrangement of the bolt-type connecting piece, the connection and fixation of an upper connecting pile and a lower connecting pile are achieved, and the technical problem that waggling exists between the upper connecting pile and the lower connecting pile which are fixedly connected is solved.

The present invention relates to an intelligent door lock. It includes the following several portions: power supply, display, control circuit, keyboard, actuating mechanism and sensor circuit. The described control circuit includes handset module capable of transmitting and receiving handset short message, microprocessor, flash memory and several interface circuits, in the handset module interior a SIM card interface circuit is set, the described handset module and sensor circuit are connected with microprocessor. Said microprocessor is respectively connected with keyboard, flash memory, display and actuating mechanism by means of interface circuits.

The invention relates to a tablet line flower fabric technology for vitrified tiles. The technology comprises the steps of fabric conveying, line fabric conveying, tablet pelletizing and fabric combining and stacking in areas. The fabric conveying includes that micro powder fabric is placed into a fabric hopper, and subjected to blanking in a rotary mode into a fabric storage hopper through a fabric roller, free falling and stack on a plane plate; the line fabric conveying includes that the line fabric is blanked onto a baffle and a shaking screen by the rotation of a line blanking roller and evenly scattered below the baffle and the shaking screen, and covers the fabric; the tablet pelletizing includes that powder fabric is ground into micro powders and pressed into tablet pellets, the pellets are added into the fabric storage hopper and fall on the fabric and the line fabric in a suspension mode; and the tablet pelletizing and fabric combining and stacking in areas includes that the fabric, the line fabric and the sheet pellets are stacked successively in a circulation running board mode, fillers are filled to perform flattening, and the mixtures are conveyed to a press machine cavity through a fidelity grille to complete the pressing. The tablet line flower fabric technology for vitrified tiles has the advantages of showing polycrystalline elements in natural stones, being natural and smooth in grains and lines, few in human traces, high in controllability and the like.

The invention discloses a device and a method for online detection of atmospheric salt fog content. The device comprises a sampling module and an analysis module, wherein the sampling module comprisesan absorption liquid storage box, a reagent liquid storage box, an air pump, a transfer pump, a sampling bottle, a reaction bottle, a sampling needle and a cuvette, the air pump is used for pumping the atmosphere to the sampling bottle, the transfer pump is used for pumping the absorption liquid in the absorption liquid storage box to the sampling bottle, the solution in the sampling bottle to the reaction bottle and the reagent liquid in the reagent liquid storage box to the reaction bottle, the cuvette is arranged on a conveyor belt, and the sampling needle can pump all the solution in thereaction bottle and inject the solution into the cuvette arranged on the conveyor belt; and the analysis module comprises a spectrophotometer. The device and the method for online detection of atmospheric salt fog content can reduce the measuring period of the content of the atmospheric salt fog and improve the testing accuracy.

The invention discloses an intelligent home controlling method, which solves the technical problem of reducing the cost of home control. The method comprises the following steps: when a user presses a key of a wireless control center, the transmitting module transmits a wireless signal out, after a wireless control signal receiving center receives the signal, the control signal converts the analog signal into a digital signal through a power line communication control module, the digital signal is transmitted on a power line after modulation, low-pass filtering and amplification, a power line communication receiving module receives and demodulates the digital signal to obtain the control signal, and the control signal is communicated with an electric appliance through a serial port or an IIS to control the work of the electric appliance. Compared with the prior art, since the wireless control signal transmission is adopted, the communication signal is transmitted by using the power line, the invention has the advantages of long transmission distance, no directivity and no interference, the rewiring is not required, the intellectualized modification of the current home conditions is convenient, the structure is simple, and the cost is low.

The invention discloses a corrosion-resistant high-strength support / hanger assembly. The support / hanger assembly comprises a tube clamp and a connecting part arranged at the lower end part of the tube clamp, wherein the tube clamp comprises two clamp pliers which are in the same shape and are symmetrically arranged; each clamp plier comprises a connecting end, a circular arc section and a clamping section; the connecting ends of the two clamping pliers are connected together in a rotating manner; the arc mouth ends of the circular arc sections of the two clap pliers are oppositely arranged; fastening holes are respectively formed in the clamping sections of the two clamp pliers, and the two fastening holes correspond to each other. The invention further discloses a manufacturing technology of the corrosion-resistant high-strength support / hanger assembly. The support / hanger assembly disclosed by the invention is simple and reasonable in tube clamp structure, scientific in design, high in strength, hardness and toughness, resistant to acid and alkaline corrosion, not liable to deform under high temperature and high pressure, and long in service life.

The invention discloses a paralyzed limb movement control method based on acupuncture point functional electrical stimulation. Body surface myoelectrical signals when healthy limbs move are collected by using a body surface exploring electrode array, signal processing such as amplification and filtering is carried out on the collected myoelectrical signals through a signal processing circuit, then the myoelectrical signals are transmitted to a stimulating signal generating circuit through a communication channel to generate stimulation signals, and lastly, the stimulation signals are applied to a needle-shaped or concentric circle stimulating electrode array of an assigned acupuncture point of the paralyzed limb to achieve the movement of the paralyzed limb. According to the paralyzed limb movement control method based on the acupuncture point functional electrical stimulation, the mode of electric needle stimulation is adopted, body surface stimulation is changed into body internal stimulation on meridian points, an acupuncture therapy is inherited and developed, the advantages of being good in selectivity and high in sensitivity are achieved, and the paralyzed limb movement control method based on the acupuncture point functional electrical stimulation can be applied to sites such as control over movements of the paralyzed patient limbs caused by various injuries and diseases.

The invention relates to a pressing-pushing type box body and a manufacturing process. A plurality of lateral grooves formed by two L-shaped walls with the top wall and the lateral wall combined are formed in two lateral walls on the long side arranged opposite to the opening end of the pressing-pushing type box body in a recessed mode. A plurality of L-shaped insertion bones are arranged on the plane in a box cover at the portion corresponding to the lateral grooves in a protruding mode. Through grooves are formed in two lateral walls on the short side arranged opposite to the opening end of the box body, a frame groove is formed in the bottom end of each through groove, the top walls that the through grooves correspond to are vertically bended and contained in tongue pieces in the frame grooves, and frame insertion tongues are arranged in the plane of the box cover at the corresponding portion in a protruding mode. When the box cover covers the box body, the L-shaped insertion bones are inserted into the lateral grooves of the box body and move relative to the box body to enable the L-shaped insertion bones of the box cover to be clamped in the lateral grooves of the box body. The frame insertion tongue pieces of the box cover are properly embedded in the location frame grooves of the tongues of the box body in the forward-pushing and back-pulling process of the frame insertion bones.

The invention relates to a bidirectional idling clutch mechanism. The bidirectional idling clutch mechanism is arranged in a lock body, is mutually connected with a handle, and mainly comprises a main hub, a key open button, an auxiliary hub, a roller and an expansion motor assembly, wherein the main hub is engaged with the handle; one side of the main hub is provided with the key open button, a square rod key and the auxiliary hub in sequence; the roller and the expansion motor assembly are arranged under the four parts; and the main hub, the square rod key and the auxiliary hub are provided with a circular groove to be matched with the roller. The bidirectional idling clutch mechanism has the advantages that the handle idles in normal times, whether a door opens leftwards or rightwards, the mechanism is arranged inside or outside the door, the clutch mechanism can be used; and the side of the door provided with a lock can become a door opening position, and the bidirectional idling clutch mechanism belongs to omnibearing type without directionality, and further reduces complicated work in purchasing and installing.

The invention discloses a pan support for reusing of waste heat from gas kitchen range, aiming to solve the existing pan support problems of function singleness and a great deal of heat energy dissipation through pan support when using gas kitchen range. It comprises couple supporting claws and basined inner wall; there is outerwall corresponded to the form of basined inner wall and made up of basined interlayer water jacket at outside of basined inner wall, opening through port underside of basined interlayer water jacket, admitting pipe and rising pipe have their location on the outerwall top of basined interlayer water jacket. On one side of basined interlayer water jacket, setting radial water jacket cavum isolating plate, admitting pipe and rising pipe are placed separated on outerwall of basined interlayer water jacket of two sides of jacket cavum isolating plate. In basined interlayer water jacket, radial setting symmetrically two water jacket cavum isolating plate; under the water jacket cavum, setting separated connecting pipes connected to water jacket cavum of connected body underside. The invention fastens heat generated from burning to suffice of cooker, absorbs wasted heat by interlayer water jacket, and meantime is also a quick water heater.

The invention relates to a rotating seal which belongs to the field of sealing technology, in particular to a non-contact seal that is especially suitable for being used as the seal of two phase of gas-liquid or a revolving spindle with higher linear velocity. A whole ring-shaped seal is formed by connecting an upper semi-ring seal and a lower semi-ring seal; the semi-ring seals are respectively provided with a semi-ring base body which is provided with a cooling jacket, an end cover connecting plate and a semi-ring seal connecting plate used for connecting the two semi-ring seals; and the semi-ring base body is also provided with a cooling loop and a lipid supplementing hole. The invention has the advantages of greatly reducing the friction and abrasion of the sealing contact surface and avoiding the damage of shaft diameter; due to the distinctive valving structure of the rotating seal, the installation and maintenance are convenient, and the application scope and field can be enlarged; the rotating seal has good sealing performance, no leakage, strong pressure-proof capability and long service life, and can be used for sealing gas and liquid at the same time.

A Bluetooth remote controller comprises a microprocessor, an input keyboard, a Bluetooth transceiver module and a display module, wherein the input keyboard, the Bluetooth transceiver module and the display module are all connected with the microprocessor. The Bluetooth remote controller is electrically connected with remotely-controlled electric appliances through Bluetooth communication, has long remote control distance and is non-directional; the control of all the electric appliances is not influenced; one-to-one control of the electric appliances is realized; and the display module can simultaneously receive the working states of the electric appliances so as to achieve remote monitoring of household appliances.

The invention provides a heat conduction and heat dissipation integrated flat heat pipe. A condenser is designed in the cavity position of a traditional flat heat pipe to replace a condensation surface, steam generated at an evaporation end can be directly condensed on the surface of the condenser, heat released by condensation is directly taken away by a cooling working medium inside the condenser, and integration of heat conduction and heat sink heat dissipation of the flat heat pipe is achieved. Compared with the traditional flat heat pipe, the heat conduction and heat dissipation integrated flat heat pipe has the following advantages that 1) the steam generated at the evaporation end does not need to penetrate through a liquid layer and is directly condensed on the surface of the condenser, and gas-liquid separation in the true sense is achieved; 2) the heat released in the condensation process is directly taken away by the cooling working medium flowing inside the condenser, and contact heat resistance between the flat heat pipe and a heat sink is avoided; and 3) the condenser is arranged in the cavity position of the traditional flat heat pipe, the steam is condensed, and meanwhile, the supporting effect on the interior of the flat heat pipe is achieved, so that the structure is more compact, and the total volume of heat conduction and heat dissipation of the flat heat pipe is reduced.

The present invention relates to a display device, which is generally easy to see through the back side, and illuminates a predetermined display pattern to display it as needed. For this purpose, the display pattern (20) is formed by the micro-recesses (29) provided on at least one side of the light-transmitting substrate (10), and at least one light source is arranged on the side end surface of the light-transmitting substrate (10) (30). In addition, the area density of the tiny recesses (29) forming the display pattern (20) is below 20%, and the opening area of ​​one recess (29) is below 0.03mm2.

The invention discloses a composite coating piston ring inlaid with wear-resistant particles. The composite coating piston ring comprises a cast iron body and a composite coating layer plated on the outer circle of the main body, wherein the composite coating layer is a mesh-patterned electroplating coating inlaid with the wear-resistant particles; and the wear-resistant particles are one or more selected from silicon carbide, silicon dioxide, aluminium trioxide and diamond. A processing method of the composite coating piston ring inlaid with the wear-resistant particles comprises the steps of preparing a composite plating solution with a concentration of chromic anhydride being 200-400 g / L, a concentration of sulfuric acid being 2-6 g / L, a concentration of benzoic acid being 4-10 g / L and 100-130 g / L of the wear-resistant particles; forming a hard chrome layer on the surface of the piston main body by applying a forward current; carrying out reverse etching by applying a backward current, the wear-resistant particles being adsorbed to cracks during the reverse etching process; and repeating the reverse etching process, so that the wear-resistant particles are inlaid in the composite plating layer. The composite coating piston ring inlaid with the wear-resistant particles has good wear-resistant performance, high oil storage property and long service life. The production method provided by the invention is simple in operations and is stable.

The invention relates to a double-rotor wind power generation unit and belongs to the technical field of wind power generation. According to the technical scheme, a power generator (8), an upper wind wheel and a lower wind wheel are arranged in a cross-shaped frame in the mode of being perpendicular to the ground, and the upper wind wheel and the lower wind wheel rotate in opposite directions; each wind wheel (A) is composed of a vertical shaft (1) and blades (2); the vertical shaft (1) of each wind wheel is connected with a shaft of the power generator (8) and is perpendicular to the ground; the corresponding three blades (2) are installed on each vertical shaft (1); the blades are in wing shapes; turbulence promoting components (7) are arranged on the front edges (a) of the blades, cutting is conducted to the rear edges with the 32% positions of the front edges of wing chords (c) of the blades as starting points, and winglets (6) are installed at the upper end and the lower end of each blade of each wind wheel respectively. According to the double-rotor wind power generation unit, when the double-rotor power generator is driven through the upper wind wheel and the lower wind wheel to rotate, the lift force and resistance of wind energy can be used at the same time, reverse rotation is achieved, the rotating speed is increased, and power generation efficiency is improved; the double-rotor wind power generation unit can be started by means of the breeze at the speed of 1m / s, noise is avoided, and the double-rotor wind power generation unit is not directional and is high in wind resistance.

The invention relates to a flame-retardant fiber non-woven fabric. The flame-retardant fiber non-woven fabric comprises a middle layer, and an upper surface layer and a lower surface layer which are located at two sides of the middle layer, wherein the middle layer is prepared from the following raw materials in parts by weight: 35 to 55 parts of modified cocoanut husk fiber, 5 to 8 parts of chrysotile, 10 to 15 parts of flame-retardant fiber, 3 to 5 parts of modified nano-sized pyrophyllite, 15 to 25 parts of an algae extract and 3 to 5 parts of zinc borate. The composite material non-woven fabric provided by the invention has the following advantages: normal production can be totally realized according to an original production process; and the non-woven fabric has good filtering performance and spinnability, no pulp dripping, good coloring performance, uniform lapping, normal gram weight, high tensile strength, good softening property, bacterium resistance, flame retardancy, good waterproof effect, no toxicity, no stimulation, non-directional strength, and similar vertical and horizontal strength.

The invention relates to a mid-range magnetic resonance wireless energy transfer system, which comprises an emission portion and a reception portion. The emission portion comprises a magnetic resonance energy transfer transmitting coil. The magnetic resonance energy transfer transmitting coil is connected with an alternating current source. The alternating current source is used for generating a high-frequency alternating current. The magnetic resonance energy transfer transmitting coil generates an alternating magnetic field under excitation of the high-frequency alternating current. The reception portion comprises a magnetic resonance energy transfer receiving coil and a rectifying circuit, which are connected mutually. The magnetic resonance energy transfer receiving coil is used for receiving the alternating magnetic field generated by the magnetic resonance energy transfer transmitting coil and generating magnetic resonance accumulated energy; and the rectifying circuit is used for rectifying the accumulated energy and then, supplying the energy to a load. The magnetic resonance energy transfer transmitting coil and the magnetic resonance energy transfer receiving coil have the same resonant frequency. The system can improve transmission distance and transmission efficiency.

The invention provides a method for cleaning a first mirror for a tokamak device by a direct-current cascade arc plasma torch. The method for cleaning the first mirror for the tokamak device by the direct-current cascade arc plasma torch comprises the following steps of presetting a working gas and measuring the emission spectrum of a standard lamp; turning on a vacuum apparatus, a water cooling apparatus and a gas inlet apparatus in succession, and completing the preparatory work of the discharging of the direct-current cascade arc plasma torch; discharging to generate the direct-current cascade arc plasma torch, and cleaning a sample of the first mirror; changing a relevant cleaning parameter to carry out personalized cleaning on the sample of the first mirror; detecting the recovery condition of the reflectivity of the sample of the first mirror in situ after the cleaning is carried out for a certain time, and determining whether to clean continuously or not according to a detection result; if the continuous cleaning is needed, repeatedly cleaning until cleaning requirements are met. The direct-current cascade arc plasma torch adopted for the method for cleaning the first mirror for the tokamak device by the direct-current cascade arc plasma torch is many in adjustable discharging parameter, good in directionality and free from impurity; the large-area, long-distance, uniform and quick removal of an impurity sedimentary formation on the surface of the first mirror can be realized; the on-line detection of the reflectivity is completed.

The invention discloses a control device based on a ZIGBEE wireless network, comprising a wireless remote controller and a receiving controller, wherein the wireless remote controller comprises a transmitting memory, a liquid crystal display module, a wireless transmitting module, a battery voltage detection circuit and a thin film button set, and the receiving controller comprises a wireless receiving module, a receiving memory, an output controller, a button indicating circuit and a receiving antenna. The control device has far control distance, small product size and enjoys convenient installation, use and carry, safety and reliability, and non-directional property.

The invention discloses a scaffolding method based on long readings and contig classification. According to the method, firstly, long readings are compared to a contig set, and a local scaffold set isgenerated according to comparison results; a local scaffold is composed of contig compared to the same long reading; based on position information of each contig emerging in the local scaffolds, allcontig are divided into two categories, namely repeating contig and non-repeating contig; a scaffold diagram only consisting of non-repeating contig is constructed, in which each node represents a non-repeating contig; then, a linear programming method is utilized to eliminate the orientation and sequence conflict in the scaffold diagram, so that the scaffold diagram only includes simple paths, each simple path corresponds to one scaffold; then, the repeating contig are inserted into the scaffold to form final scaffolding results. The method is simple and easy to use, shows good scaffolding results through different real data, and has high accuracy and continuity compared than other scaffolding methods.

A voice remote control household appliance system comprises a remote terminal, a remote controller, an infrared emitter, and controlled household appliances; the remote terminal is equipped with a microprocessor, a bluetooth communication module connected with the microprocessor, and a voice receiving device; the remote controller is equipped with a central processor, and a bluetooth communication module connected with the central processor; the central processor is connected with the infrared emitter through a communication line; the controlled household appliances are provided with a controller, and an infrared receiver connected with the controller; the remote terminal is communicated with the remote controller through the bluetooth communication module; the infrared emitter is communicated with the controlled household appliances through infrared signals. The voice remote control household appliance system is wide in network coverage, long in remote control distance, free of directivity, and not liable to interference, needs no key pressing, has strong universality, is convenient for user operation, and suitable for special people with, such as, hand disability, has wide application scope, can realize remote control of multiple household appliances, and has strong compatibility.

The invention provides a biological theft-proof sensor for a transmission line. The sensor comprises an inductive lead wire, a controllable oscillation signal generation circuit and a singlechip detection, signal processing and sensitivity arrangement circuit which are connected in turn, wherein the controllable oscillation signal generation circuit and the singlechip detection, signal processing and sensitivity arrangement circuit are connected with a power supply source respectively. The theft-proof sensor is used for a theft-proof monitoring system of an overhead transmission line, can be induced in time when a stayed tower of the transmission line is stolen, and improves the accuracy and reliability of the theft-proof monitoring system.

The invention relates to an integrated safety device of a high-pressure air bottle, in particular to an integrated safety valve for a high-pressure gas long-tube semi-trailer. A valve body is provided with an inner hole, one end of the valve body is provided with an inlet and drain interface, external tube threads are arranged on the inlet and drain interface, the inlet and drain interface is connected with an air inlet and a drain hole of the high-pressure air bottle in a sealing mode, the other end of the valve body is provided with a drain interface, internal tube threads are arranged on the drain interface, the drain interface is connected with the drain hole of the high-pressure air bottle in a sealing mode, an emptying interface which is communicated with the inner hole of the valve body is arranged on the cylindrical surface of the valve body, external threads are arranged on the emptying interface, a pressing nut is screwed on the external threads, a gasket, an inner clamping ring, a bursting piece and an outer clamping ring are in sequence pressed between the interior of the pressing nut and the end surface of the emptying interface from inside to outside, and an air inlet and outlet interface is arranged on the cylindrical surface of the valve body and is communicated with the inner hole of the valve body. The invention has high processing efficiency and high complete trailer assembling efficiency, and moreover, end plugs have no directional property, can be arbitrarily exchanged and are convenient to use.

The invention discloses a symmetric hole-shaped curve cycle roll which comprises a roll (1); a hole shape (2) is arranged on the peripheral surface of the roll (1); the hole shape (2) is intercepted by a plane which is vertical to the axis of the roll (1) and is in a shape of a hole-shaped curve; the hole-shaped curve is sequentially divided into a forge rolled section, a finish rolled section, afinal rolled section and an air rolled section along a circumferential direction; the curve is symmetric with the plane which passes through the axis of the roll (1) and the middle point of the air rolled section; the radius of the hole shape is continuously reduced in the forge rolled section, remains unchanged in the finish rolled section, is continuously increased in the final rolled section and remains unchanged in the air rolled section, and an angular aperture (11) is continuously reduced in the forge rolled section, remains unchanged in the finish rolled section, is continuously increased in the final rolled section and remains unchanged in the air rolled section. The symmetric hole-shaped curve cycle roll has the advantages that: the hole-shaped curve is in a symmetric structure; when the forge rolled section is seriously worn and needs to be replaced, the roll only needs to change to another direction and the final rolled section is used for forge rolling; and the service life of the symmetric hole-shaped curve cycle roll is 1.3 to 1.5 times of that of an ordinary roll, and the installation is convenient.