95 results about "Spark discharge" patented technology

The invention relates to the technical field of lasers, and discloses a corona-based creeping spark discharge strong pre-ionization pulse gas laser which comprises a main frame chamber, a pre-ionization device is fixedly mounted at the top of an inner cavity of the main frame chamber, a cathode electrode is arranged at the top of the inner cavity of the main frame chamber, and a connecting copper sheet is fixedly mounted on the lateral upper portion of the inner wall of the main frame chamber. A flow guide plate is fixedly installed on the connecting copper sheet, and an anode electrode is fixedly installed at the top end of the flow guide plate. A corona-based creeping spark discharge strong pre-ionization pulse gas laser is characterized in that a pre-ionization area can be formed on a pre-ionization device and structures on the pre-ionization device, electrons in the pre-ionization area move in an accelerated manner under the action of electric field force, and in the movement process, the electrons in the pre-ionization area are separated from the pre-ionization device. And the electrons and other gas particles are subjected to inelastic collision and ionization or excitation, so that high-concentration and uniform initial electrons are generated, a micro-discharge channel is formed, and continuous seed electrons are provided for a core discharge region of the micro-discharge channel.

The invention provides a spark discharge device and a spark discharge accurate control method, and relates to the technical field of spark discharge. The device comprises a pair of spark electrodes, a rotary switch, a capacitor and a power supply, wherein a gap exists between working ends of the spark electrodes; the spark electrode, the rotary switch and the capacitor are connected in series to form a discharging loop, and the capacitor and the power supply are connected in series to form a charging loop; the rotary switch comprises a rotatable rotor and a toothed bar connected with the rotor; a contact is arranged in the discharge loop, and when the contact is in contact with the toothed bar, the discharge loop is conducted. According to the invention, the discharge loop is rapidly switched on and switched off through the rotary switch, various parameters of spark discharge can be accurately and stably controlled, so that the spark discharge is not influenced by the environment, such as spark breakdown voltage, discharge frequency and the like, and the spark discharge can be prevented from being converted into corona, glow or arc discharge, for example, the spark discharge can be normally generated under low air pressure.

The invention belongs to the technical field of special maintenance in a high-radiation environment of a nuclear power plant, and particularly relates to a digital control system and method for high-radiation boron-containing underwater electrical discharge machining. Comprising a control module, the control module is respectively connected with a human-computer interaction interface, an input / output module, an analog-to-digital conversion module and field layer equipment, the input / output module is connected with a limit switch, and an external alarm and a control instruction are input into the input / output module. And the temperature signal, the gap voltage current and the conductivity are converted by the analog-to-digital conversion module and then are input to the control module. The method has the beneficial effects that in the electric spark discharge machining operation process under the high-radiation boron-containing water environment of a nuclear power plant and the like, centralized and effective control over all field layer equipment is achieved, and the problem that conventional discharge machining equipment cannot be used under the high-radiation boron-containing water environment is solved.

The present application is applicable to the technical field of pulsed electric field ablation catheters, and provides a pulsed electric field ablation catheter. The pulsed electric field ablation catheter comprises: a tube body part and an expansion part. The tube body part comprises a main body tube and a push-pull tube, and the push-pull tube movably penetrates through the main body tube and at least partially extends out from a distal end of the main body tube. The expansion part comprises an expansion tube, and a plurality of branch tubes are formed between a proximal end and a distal end of the expansion tube. At least one treatment electrode is provided on the branch tube, and a cooling gap in communication with the external environment is provided between the branch tube and the treatment electrode. A first perfusion channel is provided on the main body tube, and a second perfusion channel is provided on the branch tube. The first perfusion channel is in communication with the second perfusion channel, and the second perfusion channel is in communication with the cooling gap. The pulsed electric field ablation catheter provided by the present application does not require a perfusion hole to be formed on the surface of the treatment electrode, which can effectively avoid the phenomenon of spark discharge on the treatment electrode, offering high reliability.

A rotating target high yield compact D-D neutron generator disclosed by the present invention comprises an ion source unit, a vacuum main body unit and a target unit, the ion source unit generates a deuterium ion beam, the deuterium ion beam is introduced into a vacuum chamber and passes through a leading-out accelerating electrode for acceleration, and the accelerated deuterium ion beam bombards the circumferential target surface of a molybdenum target to generate a deuterium ion beam. And deuterium-deuterium fusion reaction with deuterium nuclei injected into the molybdenum target in advance is carried out, fast neutrons are released, and the neutron yield is improved. The rotating driver of the target unit drives the molybdenum target of the cylindrical structure to rotate through the insulating rotating shaft, the molybdenum target rotates to distribute beam power to the circumferential target surface of the molybdenum target, a cooling medium is conveyed to one side of the inner side wall of the molybdenum target in combination with the cooling channel, the molybdenum target is cooled, and the service life of the target unit can be effectively prolonged. The leading-out accelerating electrode is located in the vacuum cavity, operation of the vacuum main body unit is not affected by external humidity and temperature environment conditions, high-voltage ignition discharge can be effectively restrained, and the safety performance of a high-voltage electric field is improved.

The invention relates to the technical field of electric precipitation, in particular to overload monitoring equipment and a monitoring method for electric precipitation equipment, and the method comprises the following steps: acquiring target production data; determining a target dust discharge amount according to the target production data; and determining the target current magnitude according to the target dust discharge amount. The method has the advantages that the neural network is used for conducting deep learning on online collected production data, a corresponding relation model between the dust amount and the power plant production data is established, the smoke dust emission amount is predicted based on the model, the average secondary current amount of the electric field is adjusted in real time on the basis, and the purposes of reducing consumption and reducing power consumption are achieved. According to the invention, the control aims of improving the reliability of the IGBT and prolonging the service life of the IGBT are fulfilled, the spark discharge phenomenon can be reduced or avoided as much as possible, equipment such as the IGBT and a trigger circuit board can be better protected, and unnecessary electric energy consumption can be effectively reduced at the same time.

The present disclosure relates to a battery pack that includes: a plurality of battery cells; and a pack case configured to accommodate the plurality of battery cells, and having a venting unit configured to discharge gases generated from the battery cell to the outside, and a blocking portion protruding inward from an inner surface thereof so as to prevent sparks discharged from the battery cell from moving toward the venting unit.

This invention provides a high-voltage suppression and voltage regulation protection circuit, relating to the field of circuit protection technology. The circuit includes a high-voltage discharge elimination circuit, a π-type composite EMI filter network circuit, and a voltage regulator circuit connected in sequence, with terminals at both the input and output ends. The high-voltage discharge elimination circuit consists of four DC spark discharge tubes and two varistors. The π-type composite EMI filter network circuit includes two high-voltage ceramic capacitors, two inductors, and one common-mode inductor. The voltage regulator circuit consists of an electrolytic capacitor and a Zener diode. Through the synergistic effect of the front-stage high-voltage elimination, intermediate-stage filtering, and rear-stage voltage regulation, the circuit achieves suppression and voltage regulation protection against high-voltage interference ranging from kilovolts to tens of kilovolts, ensuring continuous normal operation of the circuit system under harsh high-voltage environments.

The utility model discloses a numerical control electric spark discharge processing machine, include: electric spark processing machine tool is provided with the bottom plate in, the bottom plate bottom is provided with the second electric push rod, and the lifting end of second electric push rod is provided with the connecting plate, and the connecting plate surface is provided with the vertical board, and the vertical board side is provided with the first electric push rod, and the processing plate side is provided with the removal groove, and the removal groove is provided with the moving plate in, and the moving plate is provided with the lifting plate in, and the lifting plate surface is provided with the base, and the base side is provided with the clamping plate, beneficial effect is: first can through the first electric push rod to the clamping plate and push, thereby just can use two sets of clamping plate clamping effect to the workpiece positioning clamping, thereby the subsequent electric spark processing machine tool is convenient to the workpiece and processes, when processing ends, can start second electric push rod and make the connecting plate and go up, thereby just can make the processing plate and go up, thereby convenient subsequent to the workpiece after processing and take down.

The invention belongs to the technical field of special maintenance in a high-radiation environment of a nuclear power plant, and particularly relates to a digital power supply system and method for high-radiation boron-containing underwater electrical discharge machining. The AC external power supply is connected with an external power supply; the AC external power supply is connected with a rectification module; a synchronous trigger signal is input into the rectification module; the rectification module is connected with a filtering module; the protection module and the monitoring module respectively output signals to the rectification module, the storage module and the filtering module. The device has the beneficial effects that controllable and stable discharge machining operation power supply output is provided in the electric spark discharge machining operation process in a high-radiation boron-containing water environment such as a nuclear power plant, and the problem that a conventional discharge machining power supply cannot be used in the high-radiation boron-containing water environment is solved.

The invention discloses a bearing and a vehicle with the same, and relates to the technical field of mechanical parts, the bearing comprises an inner ring, an outer ring, a plurality of balls, a first sealing piece and a conductive piece, the outer wall of the inner ring is provided with a first convex part, and the inner wall of the outer ring is provided with a second convex part; the plurality of balls are rotatably arranged between the inner ring and the outer ring; the first sealing piece is arranged between the first convex part and the second convex part to form a sealing cavity; and the conductive piece is arranged in the sealing cavity. According to the bearing disclosed by the embodiment of the invention, the sealing cavity is formed in the bearing, and the conductive piece is arranged in the sealing cavity, so that a conductive effect can be achieved, common-mode shaft voltage generated by the inner ring and the outer ring is conducted, electric spark discharge is not formed, and the electric corrosion of the bearing is prevented.

The invention provides an electric spark discharge machining machine control method and system based on industrial data processing, and relates to the technical field of industrial data processing.The method comprises the steps that in the movement process of an electric spark machining machine, working conditions are captured, and high-frequency real-time sensing data flow is output; receiving a high-frequency real-time sensing data stream through a redundant dual-channel RS485 bus, and synchronously calling a processing position time sequence slice; isomorphic processing scene matching is carried out to obtain a historical control parameter sequence; outputting a multi-modal real-time working condition feature tensor; carrying out discharge parameter increment prediction, and outputting an updated pulse parameter adjustment vector; sending the parameters to a PLC (Programmable Logic Controller) to drive a discharge module of the processing machine to execute smooth parameter adjustment transition; and iteratively executing closed-loop prediction parameter adjustment. The technical problems that in the prior art, an electric spark machining machine often depends on manual adjustment and experience to select discharge parameters, so that the precision and consistency of the machining process are difficult to guarantee, the debugging period is long, and the production efficiency is low are solved.

The utility model provides a radio frequency feed-in device for a PECVD (plasma enhanced chemical vapor deposition) reaction cavity and PECVD equipment. The radio frequency feed-in device for the PECVD reaction cavity penetrates through a vacuum cavity wall from an atmosphere side to enter a vacuum side, sequentially comprises a conductive core shaft, an insulating layer and a shielding layer which are coaxially arranged from inside to outside, and further comprises a corrugated pipe arranged on the outer side of the shielding layer, the first end of the corrugated pipe is fixed on the lower side of the top end of the shielding layer, and the second end is fixed on the wall of the vacuum cavity from the atmosphere side. According to the utility model, the structure dislocation of the radio frequency feed-in device and the vacuum damage of the PECVD reaction cavity caused by high-temperature thermal expansion can be avoided, and the sparking discharge caused by the pressure change of the outer cavity can be avoided.

One variation of a system includes a set of electrode modules configured to install a battery storage container storing a set of battery cells, each electrode module configured to generate spark discharge at a pair of gapped electrodes to locally combust flammable gas accumulating proximal the electrode module during a fault event at a battery cell. This variation of the system also includes a discharge control module electrically coupled to the set of electrode modules via a set of ports and configured to: detect an ignition event within the battery storage container responsive to spark discharge at an electrode module in the set of electrode modules; set a frequency for spark discharge at the set of electrode modules in response to detection of the ignition event; and via the set of ports, trigger each electrode module to generate spark discharge at the frequency.

To prevent the occurrence of backfire and preignition of an internal combustion engine due to unintended spark discharge of an ignition plug without generating positive voltage when charging an ignition coil.SOLUTION: The ignition device includes the ignition coil that generates a high voltage in the secondary coil 53 by interrupting the current of the primary coil 52, the igniter that conducts and interrupts the current flowing through the primary coil 52, the spark plug that is connected to the secondary coil 53 and generates the spark discharge in the combustion chamber, and the control unit 2 that sends the ignition signal of the main discharge for igniting the air-fuel mixture in the combustion chamber and the ignition signal of the sub-discharge to the igniter 54 when the residual energy amount in the ignition system from the ignition coil to the spark plug after the main discharge is larger than the predetermined threshold value.SELECTED DRAWING: Figure 3

This system provides highly accurate monitoring of spark discharges based on the time-dependent changes in spark size. [Solution] The spark discharge monitoring system comprises a receiving unit, a control unit, and a display unit. The receiving unit receives spark information. The control unit acquires the time change of the spark number based on the spark information, corrects the spark number based on operating data including at least the field current, and displays the time change of the corrected spark number on the display unit.

The invention discloses a tool electrode and a machining method, and relates to the technical field of electric spark machining, a conductive bonding layer is bonded to the tool electrode, so that the conductive bonding layer which is bonded to the tool electrode and is located on the current working face and the tool electrode are subjected to loss corrosion removal at the same time when a workpiece material is subjected to corrosion removal through spark discharge; under the flowing action of the insulating liquid medium, the etched conductive bonding layer is mixed and bonded with metal chips of the tool electrode and the workpiece which are etched together to form carbon slurry, the carbon slurry is attached to the working surface of the tool electrode, and a layer of protective film is formed on the working surface of the tool electrode; therefore, in the workpiece machining process, the protective film attached to the working face is continuously damaged, a new protective film is generated through continuous spark discharge, the working face of the tool electrode is always covered with the protective film, the actual loss of the tool electrode in the workpiece machining process is greatly reduced, and the machining efficiency of the workpiece is improved. And the service life of the tool electrode can be prolonged.

The application discloses a multi-electrode continuous discharge spark discharge generating device, and relates to the field of aero-engine ignition. The spark discharge generating device comprises an ignition circuit and a multi-electrode spark plug. The multi-electrode spark plug comprises a metal shell and a plurality of central high-voltage electrodes arranged in the metal shell. The application matches the design parameters of the multi-electrode spark plug with the non-uniformity coefficient of the electric field in the ignition end face, and designs the ignition circuit, so that the maximum value of the delay difference between the breakdown time of two adjacent discharges is less than the arc duration time, the continuous discharge of the multiple electrodes is realized, the arc flame energy is higher, the contact area of the ignition arc and the mixed fuel is larger, the combustion in the combustion chamber is more uniform, the misfire rate of the spark plug is effectively reduced, and the operation reliability of the engine is improved.

An electrode wire for electrical discharge machining and a preparing method thereof. The electrode wire comprises: a core material (1); an intermediate layer (2) located externally to the core material (1); and a surface layer (3) located externally to the intermediate layer (2). Wherein, the material of the core material (1) is a metal or an alloy, and the material of the intermediate layer (2) is a copper-zinc alloy. The intermediate layer (2) has pits (20) on its surface, and the pit (20) has micro-pits (200) on its surface. The size of the micro-pit (200) is smaller than that of that of the pit (20) on which the micro-pit located. The surface layer (3) discontinuously covers the exterior of the intermediate layer (2) and fills the pits (20) and micro-pits (200). During the preparing process, the copper-zinc alloy is formed inside the electrode wire through electroplating, heat treatment, and drawing processes, while pits (20) and micro-pits (200) are formed on the surface of the intermediate layer (2) via extrusion.

The application relates to the technical field of spinning forming, in particular to an electric auxiliary spinning forming device and method, which comprises a clamping assembly arranged on a machine tool and used for clamping a metal blank, a workpiece forming assembly arranged on the machine tool and used for spinning plastic processing of the metal blank, and a current applying mechanism arranged on the workpiece forming assembly and in close contact with the metal blank, the workpiece forming assembly can drive the current applying mechanism to move synchronously so as to perform electric heating treatment on the metal blank. The application can introduce pulse current into a spinning plastic deformation area, can effectively inhibit electric spark discharge in the contact area of the current applying mechanism and the blank, can significantly reduce the temperature gradient existing in each part of the blank, and can realize spinning forming of difficult deformation metal.

The application discloses a rotary tillage mechanism with soil remediation function, and relates to the technical field of tillage equipment. The rotary tillage mechanism comprises a power system, a vehicle frame, a rotary tillage device and a high-voltage module. The rotary tillage device is arranged on the vehicle frame, and the power system drives the rotary tillage device to work. The high-voltage module and a plurality of dielectric barrier discharge devices are arranged below the vehicle frame. The dielectric barrier discharge devices intermittently ionize air to generate active substances and energy higher than corona discharge and spark discharge, so as to kill organisms in the soil. The high-voltage module provides a voltage of 5-8kV for the dielectric barrier discharge devices. The application can not only kill soil bacteria, but also effectively degrade residual pesticides in the soil, repair the soil structure and improve the growth environment of crop root systems, so as to ensure high yield of crops. The application is convenient for manual operation, saves time and effort, greatly improves production efficiency, reduces the labor intensity of farmers, and has the advantages of safety in use, no pollution to the environment and energy saving.

The invention discloses a method for detecting elements in molten iron. The method comprises the following steps: S1, sampling and preparing a sample; and S2, detecting by using spark discharge atomic emission spectrometry, wherein the parameter setting comprises argon flushing time of 2-7 seconds, pre-combustion time of 8-12 seconds and exposure time of 9-13 seconds. By means of the method, rapid analysis of ultralow sulfur with the mass fraction smaller than 0.0050% in the molten iron and simultaneous analysis of elements such as carbon, silicon, manganese, phosphorus, nickel, chromium, copper, arsenic, tin, vanadium and titanium can be achieved, and the method has wide application prospects in the iron smelting industry.

The invention discloses a metal ceramic gradient composite electric spark machining electrode and a preparation method and application thereof.The electrode comprises a metal matrix and a gradient transition layer and a surface function layer.The metal matrix is covered with the gradient transition layer and the surface function layer.The high-hardness ceramic is arranged on the electrode, so that insulativity and electric corrosion resistance are provided; and reduction of machining precision and abnormal loss of the electrode caused by the secondary discharge phenomenon between the side wall of the tool electrode and the workpiece are effectively avoided. Meanwhile, a metal-ceramic gradient transition layer is arranged, the gradient layer has continuously changing components and performance, slow release of thermal stress is achieved, and the problem of interface stripping caused by mismatching of thermal expansion coefficients of an electrode side wall insulating layer is solved. The electrode prepared by the invention can resist the impact of electric spark discharge high temperature (greater than or equal to 2500 DEG C), the uniformity of the side wall gap and the processing efficiency can be improved, and the electrode loss rate is reduced.

This application relates to the field of laser technology and discloses a corona-based surface spark discharge high-intensity pre-ionization pulsed gas laser, including a main frame chamber. A pre-ionization device is fixedly installed on the top of the main frame chamber, and a cathode electrode is provided on the top of the main frame chamber. A connecting copper plate is fixedly installed on the upper side of the inner wall of the main frame chamber, and a guide plate is fixedly installed on the connecting copper plate. An anode electrode is fixedly installed on the top of the guide plate. In this corona-based surface spark discharge high-intensity pre-ionization pulsed gas laser, the pre-ionization device and its structure can form a pre-ionization region on the pre-ionization device. Under the action of an electric field, electrons in the pre-ionization region accelerate. During this motion, electrons collide with other gas particles inelastically and undergo ionization or excitation, thereby generating a high-concentration and uniform initial electron and forming a micro-discharge channel, providing a continuous supply of seed electrons to its core discharge region.

The invention relates to a seal assembly and a bearing assembly. The sealing assembly is used for sealing an annular space between the first element and the second element, the sealing assembly is integrally annular and comprises at least one conductive section and at least one non-conductive section which are distributed in the circumferential direction and connected with each other, and the at least one conductive section is used for establishing conductive connection between the first element and the second element. The bearing assembly includes a first element, a second element, and a seal assembly. The conductive section is used for establishing conductive connection between the first element and the second element, so that charge can be released in time. Therefore, damage to the first element and the second element caused by spark discharge can be effectively avoided, and electric corrosion is avoided. Further, a portion of the sealing assembly is provided as a conductive segment, rather than the entire sealing assembly is configured to be made of an expensive conductive material, and thus cost can be reduced. In conclusion, the sealing assembly and the bearing assembly can avoid electric corrosion and are low in cost.

The invention discloses a device and method for preventing secondary discharge of a side wall in electric spark deep hole machining, and relates to the technical field of electric spark machining.The device comprises an electric spark discharge machining structure and a resistance increasing particle release system.The electric spark discharge machining structure comprises an inner spraying type tool electrode, a hollow connecting section and a chuck; the resistance-increasing particle releasing system comprises a connecting seat, a switching system, an oil feeding valve and a resistance-increasing particle adding structure; the spark oil circulating system is used for realizing circulation of spark oil in the working box; the working box is internally provided with a back pressure system, the back pressure system comprises a back pressure plate, the back pressure plate is provided with an electrode via hole, and the two sides of the back pressure plate are provided with pre-tightening bolts. Tiny plastic particles are guided to be enriched in a processed hole wall area through the back pressure system, so that a high-resistance barrier is formed; discharge energy is concentrated at the bottom end of the electrode for normal corrosion removal, the machined precise side wall is prevented from being corroded again, and therefore the deep hole with the steep side wall and the extremely-small taper is machined.

The embodiment of the invention discloses a detection system, a household appliance and a detection method of the household appliance. The system comprises a power supply circuit, a first thermal circuit breaker, a first resistor, a first voltage detection circuit, a power conversion circuit and a control circuit. The power supply circuit comprises a zero line and a live line. The first thermal circuit breaker is connected in series with a zero line or a live line; the first resistor is connected in parallel with the first thermal circuit breaker; the first voltage detection circuit is connected with the output end of a zero line or a live line connected in series with the first thermal circuit breaker; the power conversion circuit is connected with the live wire and the zero line; the control circuit controls the electric load to run for a preset time after being powered on, the first voltage detection circuit obtains a corresponding first voltage detection signal, and the control circuit judges whether the plug has a spark discharge phenomenon or not based on the first voltage detection signal. The system is simple in structure, relatively small in size and relatively high in integration level, and not only can detect the spark discharge phenomenon of the plug, but also can protect the circuit under the spark discharge phenomenon.

The application discloses a spark spectrum analysis method for the inclusion content distribution on the surface of large-size metal materials, which continuously excites and scans the surface of the large-size metal materials through spark discharge to obtain the mixed distribution data of the solid solution and inclusions of the inclusion elements on the surface of the large-size metal materials, and further obtains the relative frequency distribution graph of the spectral intensity; the relative frequency distribution graph of the spectral intensity is subjected to normal distribution and Gumbel extreme value distribution peak fitting processing to obtain the Gumbel extreme value distribution data of the spectral intensity of the inclusions; the number and size information of the inclusions of the small sample are acquired to obtain the maximum inclusion size information; the inclusion size information of the small sample and the maximum inclusion size information are associated with the spectral intensity distribution data of the inclusions to determine the corresponding relationship between the size and the spectral intensity of the inclusions, and the content distribution result of the inclusions on the surface of the large-size metal materials is obtained. The application can quickly obtain the accurate distribution information of each element inclusion on the surface of the metal materials.

The invention belongs to the fields of plasma chemical industry, microelectronic precursor preparation and green nitrogen conversion, and discloses a series combined discharge-based electronic-grade nitric acid preparation device, which comprises a pretreatment module, a dielectric barrier discharge and spark discharge series connection module, a gas-liquid mixed absorption module and a liquid phase refining module. After air is subjected to drying and flow and pressure regulation, O3 is generated in dielectric barrier discharge, and N2O5 is efficiently generated in spark discharge; n2O5 gas rapidly reacts with a circulating absorption liquid through a vortex-Venturi tube to generate primary dilute nitric acid, and then the primary dilute nitric acid is deeply purified through a liquid phase refining module to obtain electronic-grade nitric acid with the mass concentration of HNO3 being greater than or equal to 70% and the content of impurities such as metal ions and TOC being controlled at ppb grade. The system provided by the invention has the advantages of normal temperature and normal pressure, modular operation, low energy consumption and high yield, realizes green, efficient and distributed preparation of high-purity nitric acid, and overcomes the defects of high energy consumption, insufficient purity and the like of the traditional Ostwald process.

The utility model relates to a structure for manufacturing a high-precision joint line, which comprises a mold core and an electric spark discharge electrode, the middle part of the mold core is provided with a central cavity, the mold core is provided with a plurality of sliding chutes penetrating into the central cavity from the outer side, and the sliding chutes are internally provided with sliding blocks in a sliding manner; the end, located in the center cavity, of each sliding block is used for forming a circle of mold closing cavity in a surrounding mode, the mold core is provided with a positioning piece used for positioning the sliding blocks when the sliding blocks are located at the positions where the mold closing cavities can be formed, and a plurality of protruding strips are distributed at the ends, located in the center cavity, of the sliding blocks. The electric spark discharge electrode is located in the mold closing cavity and comprises a product overall contour section used for being attached to the sliding block, it can be guaranteed that a mold closing line is smooth enough, and the sliding block can achieve very high dimensional accuracy and surface smoothness.