34results about How to "Troubleshoot transfer issues" patented technology

The invention discloses a balance point Halo orbit phasing orbit transfer method taking the time constraint into consideration, relates to a Halo orbit phasing orbit transfer method based on an earth-moon three-body dynamic model and belongs to the technical field of aerospace. According to the method, a dynamic equation is established under a restrictive three-body model formed by the earth, the moon and the star, and a Halo orbit near the point L2 is generated under an earth-moon rotation system; the Halo orbit initial phase position of a detector and the phase position difference needing to be changed are determined, and the optimal fuel phasing orbit meeting the phase position constraint condition and the transfer time constraint condition is obtained through an optimization algorithm with the initial anchoring time and transfer time as optimization variables; and the time difference delta t, the task Halo orbit or the upper limit tmax of the transfer time are adjusted according to the task which the detector needs to fulfill, and the orbit shadow detection avoiding task or the spatial intersection detection task of the detector on the Halo orbit is fulfilled. The method can obtain the optimal fuel phasing orbit meeting the phase position constraint condition and the transfer time constraint condition, and has the advantages of good convergence, high flexibility and the like.

The invention relates to a workshop production plan and scheduling integrated method under a cross-workshop cooperation mode, which comprises the following steps of: firstly determining a narrowing workshop and a narrowing procedure; secondly, iterating, in each iteration process, pre-scheduling by adopting a dispatching rule-based scheduling method; and finally, regulating a production quantity according to a pre-scheduling result until outputting a scheduling result a corresponding production plan when the iteration is ended. According to the invention, the problem of unbalance of capability of production workshops can be effectively solved, the problem of transfer of a production task crossing the workshops is effectively solved, the production plan and the scheduling are integrated, and a production plane is given while a scheduling result is obtained.

The invention discloses rescue transport equipment used for cardiology department. The rescue transport equipment used for cardiology department includes: a bed board, a bed body, a lifting device, rollers and a transfusion rack, the lifting device is disposed in the bed body, the bed board is connected to the lifting device, the rollers are connected to the a lower end of the bed body, the transfusion rack is connected to the bed board, and handles are connected to the bed body; and the bed board comprises a bottom plate and a movable plate disposed on the bottom plate, two ends of the bottomplate are provided with slide rails, and the side of the bottom plate is provided with railings which are detachably connected. The rescue transport equipment used for cardiology department in the invention is simple in structure and low in cost, and solves the difficulty that a cardiology patient needs to be quickly and conveniently transferred without moving, and avoids the secondary injury tothe patient in the process of hospital bed changing. The splicing conversion of the transport equipment is extremely convenient, only two identical rescue transport equipment can realize the changing,and the equipment is suitable for large-scale use.

The invention provides a vacuum chuck and bracket type vacuum adsorption equipment provided with the vacuum chuck. The vacuum chuck is used for adsorbing at least one workpiece and comprises a chuck body with a gas inlet channel, a suction nozzle arranged on one side of the chuck body, and at least one friction gasket arranged on the bottom side of the suction nozzle, wherein the suction nozzle comprises an outer ring part and an inner ring part which are arranged on the bottom side of the suction nozzle; an annular gas gap which is gradually reduced in a direction from the bottom side of the suction nozzle to the gas inlet channel and is communicated with the gas inlet channel is arranged between the outer ring part and the inner ring part; when gas is blown out from the gas inlet channel to the annular gas gap to form an annular vacuum region for adsorbing the workpiece. When the workpiece is adsorbed by the annular vacuum region, the workpiece leans against the friction gaskets so that the disadvantages that the position of the suction nozzle needs to be adjusted additionally and a transportation and loading procedure can be carried out only when a framework fixes a side edge when the vacuum chuck is used for adsorbing the workpiece can be improved.

The invention belongs to the technical field of spectrum detection, and relates to a model transferring method between different kinds of spectrographs. A model transferring method between a hyperspectral camera and an ordinary spectrograph comprises the following steps of (1) collecting spectrum data and a sample concentration value of a sample under the ordinary spectrograph; (2) collecting image data of the sample under the hyperspectral camera; (3) obtaining spectrum data of common use wavelength parts of the spectrum data of the ordinary spectrograph and the average spectrum data of the hyperspectral camera; (4) building an ordinary spectrograph correcting model; (5) dividing a standard set and an unknown set of the two spectrographs; and (6) performing model transferring on the ordinary spectrograph and the hyperspectral camera by using a repeated sample method through being combined with a segmented direct correction and slope / intercept correction method; and substituting the result after the unknown set transferring of the hyperspectral camera into the original ordinary spectrograph correction model to obtain a prediction result after the hyperspectral camera transferring.The method provided by the invention solves the problem of model transferring between the ordinary spectrograph and the hyperspectral camera; a great amount of image information data collected by thehyperspectral camera can be fast predicted; the workload is greatly reduced; and the powerful foundation is provided for the wide application of the hyperspectral camera to quantitative analysis and fast measurement technologies.

The dust removal device comprises a dust suction hood, a pneumatic conveying pipeline, an adhesive tape press-sealing type synchronous transfer system and dust removal equipment, the adhesive tape press-sealing type synchronous transfer system comprises an air conveying opening, a movable air bellow, a ventilation groove, a ventilation groove open hole, a rubber belt and a roller, the movable air bellow is in an inverted-U shape and movably installed on the upper surface of the ventilation groove, and the movable air bellow is in an inverted-U shape and movably installed on the lower surface of the ventilation groove. The ventilation groove openings are located in the upper surfaces of the ventilation grooves and are connected with the movable air bellow and the ventilation grooves, and the distance between the ventilation groove openings is smaller than the length of the movable air bellow so that it can be guaranteed that the movable air bellow at least covers one ventilation groove opening at any time; more than one ventilation slot opening is always communicated with the movable air bellow and the ventilation slot, and the movement direction of the rubber belt is changed by utilizing the roller, so that the rubber belt at the place where the movable air bellow passes is lifted, the rest part of the rubber belt presses and seals the ventilation slot opening, and the smoothness of dust removal and ventilation is ensured under the condition of continuous discharging; meanwhile, the ventilation groove opening is adopted to replace a belt gland sealing mode adopted at the upper part of the ventilation groove, so that the sealing effect is better, the dust removal effect can be obviously improved, and the dust removal energy consumption is reduced.

The invention discloses a method for promoting natural growth of submerged plants by increasing the transparency of a black and odorous water body. According to the method, particulate matters depositing at a mud-water interface are dispersed to overlying water through mechanical or jetting flushing in a relatively closed water body formed by a mud surface and a solid border, and meanwhile overlying water turbulent flow limited by the solid border is formed; turbulent flow contents are adequately washed away by virtue of the overlying water turbulent flow, and therefore, the particulate matters with different particle sizes are further dispersed into the overlying water; particle size gradient distribution is generated under the action of gravity and a fluid force along the direction of gravity; rough particles deposit to cover bottom mud to form a stable deposition layer, and fine particles, namely suspended particles are transferred out of water through flocculent precipitation; and after a certain period of time, the water body can be crystal clear and can meet light conditions of the submerged plants. The submerged plants need to be timely planted in a water area in which submerged plants do not naturally grow in spring or a relatively deep water area so as to gradually restore self-cleaning capacity of the water body, and the conversion of water ecology is promoted.

The invention relates to a method for non-epitaxially growing a semiconductor, which belongs to the field of preparation of nanometer materials. The method is a low-temperature liquid phase method, and comprises the following steps of: dropwise adding silver sol onto a substrate, and vaporizing a solvent in the silver sol to obtain a silver film; keeping a substrate silver film surface upward, adding ethanol and a 1-sulfo-decane acetone solution, standing, adding a chalcogen precursor solution, mixing, reacting at the temperature of 30-80 DEG C for 4-12 hours, washing with absolute ethanol, and naturally airing to obtain an amorphous film; and keeping an amorphous film surface upward, adding toluene, oleic acid and oleylamine, standing, adding a methanol solution of a cadmium salt and a phosphine ligand, reacting at the temperature of 50-80 DEG C for 2-6 hours, washing with absolute ethanol, and naturally airing to obtain a semiconductor which grows non-epitaxially. The method is low in cost, and is easy for large-scale production; and the method is not easily limited by lattice mismatch, a deposit critical thickness and a substrate, a single crystal semiconductor with a one-dimensional micro / nano structure or a two-dimensional film structure can be grown in situ on different substrates under large lattice mismatch, and the method has a wide application field.

In order to realize a calling inquiry transferring method used for VPN based on a broadband SIP protocol, the invention provides a calling inquiry transferring method used for a broadband simulated special network VPN. The method comprises the following steps that: a first user initiates transferring Refer request to an application server of a first network; the application server of the first network processes the Refer and response thereof, Notify and response thereof; an application server of a second network where a second user is positioned transmits media information of a third user to the second user; the media information of the second user is transmitted to the third user; and communication is established between the second user and the third user. In addition, the invention alsoprovides a calling inquiry transferring system used for the broadband VPN. Through the method and the system, the communication transfer of the third party is realized in a mode that the user can initiate the Refer request on the broadband VPN based on the SIP protocol.

The invention provides a method and a device for transferring electronic coupons, which relate to the technical field of computers. One embodiment of the method for transferring electronic coupons ofthe present invention includes: receiving a transfer request of an electronic coupon from a user, wherein the electronic coupon has a transferable attribute, and the transfer request includes a request type and ownership information of the electronic coupon; performing a corresponding transfer operation on the electronic coupon according to the request type; and when the transfer operation is completed, changing the ownership information of the electronic coupon. The embodiment can realize the electronic coupon transfer based on a user system in a system without relying on the current social software, and meanwhile ensures the transfer security of virtual assets.

The invention relates to a household aerosol commodity quantity variable inspection method and a device. A volume conversion method is adopted so that firstly aerosol contents are transferred to a density bottle, and negative pressure of the density bottle is controlled by a vacuum pump and an extraction valve in the process of transferring, the negative pressure is -90KPa-95KPa, and the aerosol contents are controlled to release by an introduction valve. Then a relative density method formula is used to calculate quality of detected aerosol contents. The device comprises a port valve, a pipeline, the vacuum pump, the extraction pump, the introduction valve and the density bottle, the density bottle is connected with the extraction pump and the introduction valve by the port valve, the extraction valve is connected with the vacuum pump, and a material inlet of the introduction valve is connected with the port valve which is connected with a material outlet of a detected aerosol bottle. A sliding guide rail and a stepping motor are arranged below the detected aerosol bottle. A principle of differential pressure is adopted to solve the problem of transferring of the aerosol contents, solve the problem of control and transfer of the aerosol contents, and confirm the rules suitable for legal system measurement supervision.

The invention relates to a simple anti-scalding clamp. The simple anti-scalding clamp comprises an upper part and a lower part, wherein the upper part and the lower part are connected into a whole through a flexible side plate, the upper part is provided with a hollow cavity, and the upper part and the lower part are arranged at an interval. The simple anti-scalding clamp has the advantages of being simple in structure, light in weight, convenient to operate and good in safety performance, the problems existing in the transferring of very hot tableware are effectively solved, and scalding accidents are avoided.

The invention discloses an optimization method for governing geomagnetic storm power grid disasters by adopting small resistance, which belongs to the field of power grid safety and disaster prevention and control. The method mainly comprises four aspects of power grid GIC theoretical calculation, construction of a GIC governance optimization model, a target function and constraint conditions, optimization calculation by adopting an improved NSGA-II algorithm, and obtaining of an optimization scheme through fuzzy membership evaluation. The four technologies coordinate with one another, effective regulation and control over the power grid GIC and voltage fluctuation are achieved, the reliability of power grid operation and the economical efficiency of governance can be improved, and great significance is achieved for GIC governance in China.

The invention discloses an adapter device for a special-shaped connector of a special aerospace valve. The adapter device for the special-shaped connector of the special aerospace valve comprises a pipe joint nozzle, a screw sleeve, an outer sleeve, a seal ring, a taper sleeve and a seal rod, wherein the pipe joint nozzle is a hollow rotary body; a limiting step is arranged on the outer wall of the right end; external screw threads are arranged at two ends of the outer wall of the pipe joint nozzle; the screw sleeve is screwed onto the outer wall of the right end of the pipe joint nozzle; theright end of the screw sleeve and the right end of the pipe joint nozzle are on the same plane; an embedded cavity is formed between the pipe joint nozzle and the screw sleeve; the small end head of the special-shaped connector is embedded into the embedded cavity; the inner wall of the special-shaped connector at the embedded part fits to the outer wall of the pipe joint nozzle; the limiting stepis in butt joint with a smooth step, and the butt-joint part is sealed by the seal ring; the taper sleeve is of a tapered rotary body structure and is arranged on the right side of the smooth step ofthe small end head of the special-shaped connector; the outer sleeve is screwed onto the outer wall of the screw sleeve; and the taper sleeve is extruded into the embedded cavity. The fixed connection and the cavity communication between the pipe joint nozzle and the special-shaped connector are realized, so that the connection problem of the test of the special aerospace valve with the special-shaped connector is solved.

The invention discloses an intelligent transfer bed which comprises a bottom plate, hydraulic lifting columns, a supporting plate and a bed passing cushion; the hydraulic lifting columns are fixed atthe four corners of the bottom plate respectively; the supporting plate is fixed on the hydraulic lifting columns; the bed passing cushion is placed on the supporting plate; the bottom plate is further fixedly provided with a storage battery; a controller is fixed on the outer side of the supporting plate; a hydraulic push rod is fixed on the inner side of the supporting plate and is abutted to one side of the bed passing cushion; the hydraulic lifting columns and the hydraulic push rod are connected with the controller; the controller is connected with the storage battery; two roller fixing strips are fixed on the two sides of the supporting plate respectively; a plurality of rollers are hinged to the roller fixing strips respectively; two chutes are formed in the bottom of the bed passing cushion; and when the bed passing cushion is placed on the supporting plate, the rollers are embedded into the chutes respectively, and the bed passing cushion can move left and right on the rollers. The transfer bed solves the transfer problem of patients with inconvenient limbs and paralysis of lower limbs and is convenient in treating and curing patients with spinal injuries and transferringthe patients for various examinations; and meanwhile, the transfer bed is simple in structure, convenient to produce and manufacture and capable of reducing the cost of medical institutions.

The invention discloses a block chain data storage method and device, and relates to the technical field of block chains. The method comprises: generating an account for a current user in a block chain, and creating assets under the account, wherein the assets correspond to any type of data; randomly generating a pair of secret keys for encryption and decryption for the data, wherein the secret keys comprise a first public key and a first private key; encrypting the data by using the first public key, generating a corresponding hash value for the encrypted data through a hash algorithm, and encrypting the first private key by using the personal public key of the current user; and storing the encrypted data in a distributed file system, and storing the hash value and the encrypted first private key as transaction information in a block chain. The device comprises a creation module, a generation module, an encryption module and a storage module. The problems of low-efficiency and high-cost storage of the block chain and transfer of complex assets are solved, and the application is wider.

The invention belongs to the technical field of medical care and health care instruments, and particularly relates to a full-automatic bed-chair robot with a standing function. The full-automatic bed-chair robot comprises a bed body part and a wheelchair part, wherein the wheelchair part has a bed form and a wheelchair form; when the wheelchair part is in a bed state, the wheelchair part can be automatically butted with or separated from the bed body part; when the wheelchair part is separated from the bed body part, the wheelchair part can be switched into a wheelchair state, and running, parking and posture changing can be achieved in the wheelchair state. According to the robot, full-automatic butt joint and separation of a nursing bed and an electric wheelchair can be achieved, the robot has the functions of two kinds of nursing equipment at the same time, compared with an existing full-automatic bed-chair robot, when the robot is separated into a wheelchair form, a user can be helped to stand up and keep a standing posture, a larger contact range is provided for the user, and the user can feel more comfortable. Meanwhile, the patient can be helped to exercise the lower limb strength by exercising standing.

The invention discloses an industrial internet identifier analysis method based on an NFT domain name. The method comprises the following steps: constructing a block chain; compiling a smart contract; performing domain name registration; generating an NFT domain name; performing an NFT transaction; carrying out NFT (Non-Fourier Transform) destruction; and carrying out domain name resolution by the resolver, and the like. The method has the advantages that (1) industrial internet identification sharing and identification analysis are carried out in a domain name mode, and compared with identification, the method has better readability and memorability; (2) in the form of block chain whole network sharing records, the member nodes share each other, and the data is real and reliable at the same time; (3) a novel domain name registration system greatly improves the identification searching efficiency based on enterprises and products; (4) a cross-domain identification sharing problem is realized, and a data island problem in a traditional industrial internet identification analysis system is broken; and (5) based on the uniqueness of the domain name NFT, the operations of domain name transaction, destruction and the like are realized, and the transfer problem of domain name ownership is solved.

The patent relates to equipment used in hospitals, in particular to an apparatus capable of moving a patient. The invention aims to provide a safe, low-cost, time-saving and labor-saving apparatus forsolving the problem that a special patient is difficult to move in the prior art. The apparatus comprises a lever, a fulcrum, a balance fixing rope, a fixing rope shackle, a hook A, a hook B, a hookC, an external thread, an internal thread, a locking nut, a bed plate frame, a flat car, a lifting rope and a lifting rope ring. The fulcrum deviates to the direction of the hook C; the distance fromthe hook A to the fulcrum is greater than that from the hook C to the fulcrum; one end of the lifting rope ring is hung on a bedstead hook; the other end is hung on the hook C; the patient and the bedplate frame are lifted together by utilizing a lever principle; and then one end of a fixing rope shackle is sleeved on the hook A, the other end of the fixing rope shackle is sleeved on the hook B,the purpose of moving the patient is achieved by moving the flat car, one end of the lever naturally descends when not used at ordinary times, the hook A and the hook B are bound by the balance fixingrope, and the top hook C can be used for hanging infusion.

The invention relates to a method for non-epitaxially growing a semiconductor, which belongs to the field of preparation of nanometer materials. The method is a low-temperature liquid phase method, and comprises the following steps of: dropwise adding silver sol onto a substrate, and vaporizing a solvent in the silver sol to obtain a silver film; keeping a substrate silver film surface upward, adding ethanol and a 1-sulfo-decane acetone solution, standing, adding a chalcogen precursor solution, mixing, reacting at the temperature of 30-80 DEG C for 4-12 hours, washing with absolute ethanol, and naturally airing to obtain an amorphous film; and keeping an amorphous film surface upward, adding toluene, oleic acid and oleylamine, standing, adding a methanol solution of a cadmium salt and a phosphine ligand, reacting at the temperature of 50-80 DEG C for 2-6 hours, washing with absolute ethanol, and naturally airing to obtain a semiconductor which grows non-epitaxially. The method is low in cost, and is easy for large-scale production; and the method is not easily limited by lattice mismatch, a deposit critical thickness and a substrate, a single crystal semiconductor with a one-dimensional micro / nano structure or a two-dimensional film structure can be grown in situ on different substrates under large lattice mismatch, and the method has a wide application field.

The invention provides an astronavigation cable assembly protection device and a preparation method thereof. The astronavigation cable assembly protection device comprises a printed board, a protective shell and a protective sleeve, wherein the printed board is a surface-mounted bonding pad printed board and comprises N pairs of interconnected surface-mounted bonding pads, and lead wires in a first cable and a second cable which need to be interconnected are pasted and welded on the corresponding surface-mounted bonding pads of the printed board, so that electrical performance connection between the lead wires is realized; n is greater than or equal to the maximum number of the lead wires in the interconnected first cable and second cable; the printed board welded with the lead wires is packaged in the protective shell, the first cable and the second cable extend out of a wire outlet of the protective shell, and the protective shell fixes and protects the printed board and the connecting lead wires; and the protective sleeve coats the protective shell and is used for coating and protecting the printed board and the protective shell.

The invention discloses a clustering analysis-based spectral model transferring method. The method comprises the following steps of: (1) sample classification: a density clustering algorithm is adopted to perform clustering analysis on samples according to density distances between the spectra of the samples so as to classify the samples; (2) spectral modeling: spectral models are respectively established for samples of the same category according to a clustering analysis result; and (3) automatic model transfer: the spectrum of a to-be-detected sample is collected, and clustering analysis is carried out on the to-be-detected sample according to the method in the step (1), the category of the sample to be detected is determined, so that a spectral model to which the to-be-detected sample belongs can be determined, sample rapid measurement is carried out according to the spectral model to which the sample belongs, so that model transfer can be automatically completed. With the method disclosed by the invention adopted, spectral model transfer can be rapidly and efficiently completed. The clustering analysis-based spectral model transferring method can be used for the automatic calibration of an instrument, really realizes the rapid measurement of samples, and ensures measurement accuracy.

The invention relates to an extra-high voltage multi-terminal direct current transmission system current transfer suppression method based on a current-voltage deviation value. The method has the advantages that the direct current at the receiving end is used as the closed-loop control quantity, the direct current is considered to be directly used as the feedback quantity of the closed-loop control of the direct-current voltage reference value, and the voltage reference value in the switching process of the valve group is dynamically adjusted according to the actual current. The method directly acts on the voltage reference value, the problem of overcurrent possibly existing in the current transfer process of the converter station is simply and effectively solved, and the method has good engineering application prospects. The method provided by the invention has relatively strong reference significance for current transfer suppression of the converter station of the extra-high-voltage multi-terminal hybrid direct-current power transmission system.

The invention discloses an automatic koji making device for producing a movable contact spring on a relay, which sequentially comprises a loading platform, a first koji making platform, a second koji making platform and an overturning platform, and is characterized in that the loading platform, the first koji making platform and the second koji making platform are respectively provided with a clamping component for clamping the movable contact spring; a front-surface koji-making device for performing koji-making on the front surface of the movable contact spring is arranged above the first koji-making platform, and a side-surface koji-making device for performing koji-making on the side surface of the movable contact spring is arranged above the second koji-making platform; after the movable contact spring is subjected to koji making through the front face koji making device on the first koji making platform and the side face koji making device on the second koji making platform, the movable contact spring is transferred to the overturning platform to be overturned, and the flat area of the koji-made movable contact spring faces the upper portion so that the movable contact spring can be grabbed by a mechanical arm in the next procedure. According to the movable contact spring bending machine, automatic movable contact spring bending can be achieved, front bending and side bending of the movable contact spring are sequentially and synchronously achieved, the operation mode of the movable contact spring bending machine is fewer in man-made interference factors, efficiency is higher, and product stability is higher.

The invention relates to a household aerosol commodity quantity variable inspection method and a device. A volume conversion method is adopted so that firstly aerosol contents are transferred to a density bottle, and negative pressure of the density bottle is controlled by a vacuum pump and an extraction valve in the process of transferring, the negative pressure is -90KPa-95KPa, and the aerosol contents are controlled to release by an introduction valve. Then a relative density method formula is used to calculate quality of detected aerosol contents. The device comprises a port valve, a pipeline, the vacuum pump, the extraction pump, the introduction valve and the density bottle, the density bottle is connected with the extraction pump and the introduction valve by the port valve, the extraction valve is connected with the vacuum pump, and a material inlet of the introduction valve is connected with the port valve which is connected with a material outlet of a detected aerosol bottle. A sliding guide rail and a stepping motor are arranged below the detected aerosol bottle. A principle of differential pressure is adopted to solve the problem of transferring of the aerosol contents, solve the problem of control and transfer of the aerosol contents, and confirm the rules suitable for legal system measurement supervision.

The invention discloses an adapter device for a special-shaped connector of a special aerospace valve. The adapter device for the special-shaped connector of the special aerospace valve comprises a pipe joint nozzle, a screw sleeve, an outer sleeve, a seal ring, a taper sleeve and a seal rod, wherein the pipe joint nozzle is a hollow rotary body; a limiting step is arranged on the outer wall of the right end; external screw threads are arranged at two ends of the outer wall of the pipe joint nozzle; the screw sleeve is screwed onto the outer wall of the right end of the pipe joint nozzle; theright end of the screw sleeve and the right end of the pipe joint nozzle are on the same plane; an embedded cavity is formed between the pipe joint nozzle and the screw sleeve; the small end head of the special-shaped connector is embedded into the embedded cavity; the inner wall of the special-shaped connector at the embedded part fits to the outer wall of the pipe joint nozzle; the limiting stepis in butt joint with a smooth step, and the butt-joint part is sealed by the seal ring; the taper sleeve is of a tapered rotary body structure and is arranged on the right side of the smooth step ofthe small end head of the special-shaped connector; the outer sleeve is screwed onto the outer wall of the screw sleeve; and the taper sleeve is extruded into the embedded cavity. The fixed connection and the cavity communication between the pipe joint nozzle and the special-shaped connector are realized, so that the connection problem of the test of the special aerospace valve with the special-shaped connector is solved.

The present invention provides a call query refer method and a call query refer system for the virtual private network (VPN). The method comprises the following steps: initiating, by a first user, a refer request (Refer) to an application server of a first network where the first user is located (S102); transmitting media information of a third user to a second user through an application server of a second network where the second user is located in response to the refer request (S104); transmitting media information of the second user to the third user (S106); and establishing a call between the second user and the third user (S108). By the virtue of the present invention, a user can realize referring a call to a third party in the mode of initiating a refer request (Refer) in the broadband VPN based on SIP protocol. The present invention enriches the functions of the VPN service, and improves user experience.