Double-layer turbine blade air film cooling groove electrical machining equipment and method

Abstract

The present invention belongs to the technical field of workpiece laser processing, and specifically is an electrical processing device and method for a double-layer turbine blade air film cooling groove, wherein the processing device comprises a processing center, the processing center comprises a processing body, a processing chamber is arranged on the processing body, a limiting tool is arranged at the bottom of the processing chamber, a laser processing head is arranged on the upper side of the processing chamber, and the laser processing head processes the double-layer turbine blade workpiece on the limiting tool under the control of a numerical control system; the present invention arranges collecting holes evenly distributed on the working body and presents a ring distribution around the working body, so that the smoke generated during the laser processing will be promptly sucked into the nearby collecting holes, so that it passes through the purification filler gap, absorbs the pollutants therein, performs preliminary purification treatment on the smoke, reduces the diffusion of smoke pollutants inside the studio, improves the processing environment, and thus reduces the situation where the smoke adheres to the surfaces of various components inside the studio.

Description

Technical Field

[0001] The invention belongs to the technical field of workpiece laser processing, and in particular relates to an electrical processing device and method for a double-layer turbine blade air film cooling groove. Background Art

[0002] Electrical machining is a special type of machining tool that applies electrical energy to the workpiece to be processed so that the material is removed, deformed, changed in performance or plated. There are many forms of electrical machining, and laser machining is also a type of electrical machining. Laser machining uses a laser beam to process materials. Although its processing principle is different from traditional electrical machining (such as electric spark machining, electrolytic machining, etc.), the generation of the laser beam in laser machining requires electrical energy to drive it, so it can be regarded as a type of electrical machining.

[0003] During the laser processing of the workpiece, the high-energy laser beam burns the workpiece surface material during the processing, generating metal smoke, including various gaseous pollutants and fixed particle pollutants. These pollutants spread in the workshop, polluting the processing environment and affecting the health and safety of the workers in the workshop. Therefore, ventilation and purification equipment is installed in the workshop to purify the workshop air and prevent the accumulation of harmful pollutants. However, the ventilation equipment is usually installed on the wall of the workshop, and the pollutants have spread in the workshop before being sucked into the ventilation and purification equipment, resulting in a decline in the quality of the workshop working environment. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes an electrical machining device and method for a double-layer turbine blade air film cooling groove.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: the present invention proposes an electrical processing device for a double-layer turbine blade air film cooling groove, the processing device comprises a processing center, the processing center comprises a processing body, a processing room is arranged on the processing body, a limit fixture is arranged at the bottom of the processing room, a laser processing head is arranged on the upper side of the processing room, and the laser processing head processes the double-layer turbine blade workpiece on the limit fixture under the control of a numerical control system;

[0006] The processing chamber is in communication with the smoke purification device, and the smoke exhaust gas generated in the inner area of ​​the processing chamber is guided to the smoke purification device for treatment through the exhaust pipe;

[0007] The laser processing head comprises a working body and a working head, wherein the working head is located at the end of the processing body, and the working body and the processing body are controlled by a position control system; an energy supply component is arranged in the middle of the working body, and an annular purification chamber and a collection chamber are arranged outside the energy supply component, wherein the purification chamber is located outside the collection chamber, and the collection chamber is connected to the exhaust pipe through a connecting pipe;

[0008] The purification chamber and the collection chamber are separated by an annular limiting net, a purification filler is arranged inside the purification chamber, and a collection hole is arranged around the working head at the end of the working body, and the collection hole is communicated with the inside of the purification chamber.

[0009] Preferably, a purification filter cloth is arranged inside the purification chamber, and the area between the purification filter cloth and the limiting net is a buffer zone;

[0010] The hollow area between the purification filter cloth and the purification chamber near the outer inner wall is an absorption zone, the absorption zone is communicated with the collecting hole, and the absorption zone is filled with purification filler.

[0011] Preferably, there are multiple purification filter cloths, which are evenly distributed inside the purification chamber; both ends of the purification filter cloths are connected to the inner wall of the purification chamber close to the outside, and the middle position of the purification filter cloths is connected to the cleaning ring on the outer surface of the limiting net;

[0012] The internal area of ​​the purification chamber is divided into multiple absorption areas and buffer zones, and the cross-section of the absorption zone is triangular; a guide tube is arranged inside the collection hole, the end of the guide tube extends through the interior of the purification chamber, and a connecting hole is arranged on the side wall of the guide tube, and the connecting hole realizes the connection between the absorption zone and the collection hole.

[0013] Preferably, one end of the purification filter cloth is connected to a fixed ring on the inner wall of the purification chamber, and the other end is connected to a sliding ring on the inner wall of the purification chamber, the fixed ring is fixedly connected to the inner wall of the purification chamber, and the sliding ring is slidably connected to the inner wall of the purification chamber;

[0014] The guide pipe is slidably connected to the inner wall of the collection hole, and the guide pipe extends through each fixed ring and the sliding ring, and is slidably connected to the fixed ring; and the end of the guide pipe away from the collection hole is connected to the telescopic end of the telescopic device arranged on the inner wall of the purification chamber.

[0015] Preferably, air suction holes are evenly arranged on the outer surface of the end portion of the flow guide tube corresponding to the collecting hole, and the air suction holes are communicated with the interior of the flow guide tube.

[0016] Preferably, a collecting ring is arranged around the working head at the end of the working body, and the collecting ring is connected to the guide tube; the interior of the collecting ring is hollow, and interception holes are evenly arranged on the inner wall of the collecting ring, the interception holes point to the working head, and the interception holes are conical holes, and the guide tube is connected to the hollow part inside the collecting ring.

[0017] Preferably, the outer surface of the limiting net is slidably connected to the cleaning ring, and bristles are evenly arranged on the inner wall of the cleaning ring, and the ends of the bristles are in contact with the outer surface of the limiting net.

[0018] Preferably, an air collecting groove is provided on the outer surface of the cleaning ring facing the gap between the purification filter cloths, and a flushing hole is provided on the inner wall of the cleaning ring located at the gap between the bristles, and the flushing hole is communicated with the inside of the air collecting groove.

[0019] Preferably, the fixed ring and the cleaning ring are connected via a limiting rod, and the sliding ring and the cleaning ring are also connected via a limiting rod;

[0020] The limiting rods are made of elastic material, and are connected to the outer surface of the adjacent purification filter cloths; guide rods are vertically arranged inside the purification chamber, the guide rods are distributed in an annular shape around the limiting net, and the guide rods are slidably connected to the cleaning ring.

[0021] A method for electrically machining a double-layer turbine blade film cooling groove, the machining method uses the above-mentioned machining equipment, and the specific steps of the machining method are:

[0022] S1: First, mark the position of the film cooling groove on the double-layer turbine blade to be processed, use non-destructive testing technology to measure the thickness value of the position of the double-layer turbine blade to be processed, and combine the size information of the double-layer turbine blade to input it into the CNC system of the machining center to generate a machining program;

[0023] S2: Check the processing program. After confirming that it is correct, fix the double-layer turbine blade to be processed to the limit fixture inside the processing room through the corresponding fixture. Then the processing personnel drive the laser processing head to move to the processing position on the double-layer turbine blade by operating the CNC system, and process the double-layer turbine blade;

[0024] S3: During the processing, the closed door is started to close the opening of the processing room, and the fan equipment connected to the exhaust pipe is started at the same time to absorb and purify the smoke generated by the processing; and after the processing is completed, the air film cooling groove on the double-layer turbine blade is measured to check whether it meets the processing accuracy.

[0025] The beneficial effects of the present invention are as follows:

[0026] The double-layer turbine blade air film cooling groove electrical processing equipment and method described in the present invention, by setting the collecting holes evenly distributed on the working body, and presenting an annular distribution around the working body, so that when the working head approaches the workpiece to be processed and starts laser processing, the smoke generated by the high-energy laser beam processing the workpiece will be promptly sucked into the approaching collecting holes, so that it passes through the clearance of the purification filler and absorbs the pollutants therein, and performs preliminary purification treatment on the smoke, thereby reducing the diffusion of smoke pollutants inside the studio, improving the processing environment, and thus reducing the situation where the smoke adheres to the surfaces of various components inside the studio;

[0027] And because the flow path of smoke through the collection hole is short, the high-temperature particles in the smoke are adsorbed and limited by the purification filler before they cool down, which reduces the workload of the subsequent smoke purification treatment device and also reduces the high-temperature particles in the smoke from adhering to various pipes or filter screens and other structural surfaces during the flow process, affecting their normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 is a three-dimensional diagram of the processing equipment in the present invention;

[0030] Figure 2 is a front view of the processing equipment in the present invention;

[0031] Figure 3 is a cross-sectional view of the laser processing head of the present invention;

[0032] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0033] Figure 5 yes Figure 3 A partial enlarged view of point B in the middle;

[0034] Figure 6 It is a schematic diagram of the cooperation between the purification filter cloth and the cleaning ring in the present invention;

[0035] Figure 7 is a stereogram of a collecting ring in the present invention;

[0036] Figure 8 It is a flow chart of the processing method in the present invention.

[0037] In the figure: processing body 1, processing chamber 11, laser processing head 12, working body 121, working head 122, collecting hole 123, exhaust pipe 2, purification chamber 3, purification filter cloth 31, buffer zone 32, absorption zone 33, cleaning ring 34, gas collecting groove 341, flushing hole 342, limiting rod 343, guide pipe 35, connecting hole 351, telescopic device 352, suction hole 353, fixing ring 36, sliding ring 37, collecting ring 38, intercepting hole 381, guide rod 39, collecting chamber 4, limiting net 41, connecting pipe 42. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1:

[0040] In order to effectively solve the above problems, as shown in the accompanying drawings of the specification Figure 1-Figure 7 As shown, a double-layer turbine blade air film cooling groove electrical processing equipment, the processing equipment includes a processing center, the processing center includes a processing body 1, a processing chamber 11 is arranged on the processing body 1, a closed door is slidably arranged at the opening of the processing chamber 11, and can slide automatically to realize the control of the opening of the processing chamber 11; a limit fixture is arranged at the bottom of the processing chamber 11, and a laser processing head 12 is arranged on the upper side of the processing chamber 11. The laser processing head 12 processes the double-layer turbine blade workpiece on the limit fixture under the control of the numerical control system;

[0041] The processing chamber 11 is in communication with the smoke purification device, and the smoke exhaust gas generated in the internal area of ​​the processing chamber 11 is guided to the smoke purification device for treatment through the exhaust pipe 2;

[0042] The laser processing head 12 includes a working body 121 and a working head 122, the working head 122 is located at the end of the processing body 1, and the working body 121 and the processing body 1 are controlled by a position control system; an energy supply component is arranged in the middle of the working body 121, including structures such as a laser generator and a power supply pipeline, and an annular purification chamber 3 and a collection chamber 4 are arranged on the outside of the energy supply component, the purification chamber 3 is located on the outside of the collection chamber 4, and the collection chamber 4 is connected to the exhaust pipe 2 through a connecting pipe 42, and the connecting pipe 42 is a telescopic hose structure; the laser processing head 12 of the present application processes the workpiece by laser processing, and special processing methods such as electric spark processing can be used according to actual needs, and those that can be applied to the processing of double-layer turbine blade film cooling grooves can be applied to the present application;

[0043] The purification chamber 3 and the collection chamber 4 are separated by an annular limiting net 41. A purification filler is arranged inside the purification chamber 3. The purification filler here is selected from the type that can be used to adsorb workshop processing smoke in the prior art, such as activated carbon particles or limestone; a collection hole 123 is arranged around the working head 122 at the end of the working body 121, and the collection hole 123 is communicated with the interior of the purification chamber 3.

[0044] Specific work flow: During the processing of the double-layer turbine blade film cooling groove, the workpiece to be processed is placed on the limit fixture at the bottom of the processing chamber 11, and the workpiece is fixed and limited by the corresponding fixture. Then the processing personnel drive the laser processing head 12 to move to the processing position on the workpiece by operating the CNC system; start the laser processing head 12, and release a high-energy laser beam from the working head 122 after the energy supply component is powered on, so that the workpiece is precisely processed through a special processing method to achieve a higher processing accuracy;

[0045] In this process, because the laser beam burns the workpiece surface material during high-energy processing, metal smoke is generated, including various gaseous pollutants and fixed particle pollutants. These pollutants spread in the workshop, polluting the processing environment and affecting the health and safety of the workers in the workshop. Therefore, ventilation and purification equipment is installed in the workshop to purify the workshop air and prevent the accumulation of harmful pollutants. However, ventilation equipment is usually installed on the wall of the workshop. Before the pollutants are sucked into the ventilation and purification equipment, they have already spread in the workshop, resulting in a decline in the quality of the workshop working environment.

[0046] Therefore, the present application sets an exhaust pipe 2 on the side wall of the processing chamber 11, and controls the closed door to slide horizontally during the processing to close the processing chamber 11, so that the interior of the processing chamber 11 is in a closed environment, and the processing personnel can observe the internal processing through the transparent closed door; the smoke and dust pollutants generated during the processing can be sucked by the exhaust pipe 2, and then introduced into the corresponding existing smoke and dust purification treatment device for treatment; and the closed door can also play a protective role for the fragments of the workpiece that may be caused by the high temperature during the processing, so that the fragments are blocked and the processing personnel outside are protected;

[0047] Furthermore, the purification chamber 3 and the collection chamber 4 provided on the processing body 1 can absorb pollutants nearby because they are close to the processing position, thereby reducing the diffusion of pollutants in the processing chamber 11 and their adhesion to the surface of the processing chamber 11, and reducing the workload of later cleaning; specifically, because the collection chamber 4 is connected to the exhaust pipe 2 through the connecting pipe 42, the air pump equipment connected to the exhaust pipe 2 starts to exhaust air after it is started, and the connected collection chamber 4 is also in a negative pressure state under the action of exhaust, thereby prompting the outside air to flow into the purification chamber 3 through the collection hole 123, and after passing through the clearance of the purification filler, it flows into the collection chamber 4 through the limiting net 41, and flows along the connected exhaust pipe 2 to the smoke purification treatment device;

[0048] And because the purification chamber 3 and the collection chamber 4 both surround the functional component at the center of the processing body 1, when the airflow flows through the collection chamber 4, it surrounds and contacts the outer shell of the functional component, thereby playing a heat dissipation role for the functional component, avoiding the situation in which the heat accumulation of the functional component leads to an increase in the failure rate during continuous operation;

[0049] During this process, because the collecting holes 123 are evenly distributed on the working body 121 and are distributed in a ring shape around the working body 121, when the working head 122 approaches the processing position of the workpiece and starts processing, the generated smoke will be promptly drawn into the nearby collecting holes 123, so that it passes through the gap of the purification filler, absorbs the pollutants therein, and performs preliminary purification treatment on the smoke, thereby reducing the diffusion of smoke pollutants inside the studio, improving the processing environment, and reducing the adhesion of smoke to the surfaces of various components inside the studio; and because the flow path of the smoke through the collecting holes 123 is short, the high-temperature particles in the smoke are adsorbed and limited by the purification filler before they are cooled, which reduces the workload of the subsequent smoke purification treatment device while also reducing the high-temperature particles in the smoke adhering to various pipes or filter screens and other structural surfaces during the flow process, affecting their normal operation.

[0050] Embodiment 2:

[0051] On the basis of the first embodiment, a purification filter cloth 31 is arranged inside the purification chamber 3, and the area between the purification filter cloth 31 and the limiting net 41 is a buffer zone 32; the hollow area between the purification filter cloth 31 and the purification chamber 3 near the outer inner wall is an absorption zone 33, the absorption zone 33 is connected with the collection hole 123, and the absorption zone 33 is filled with purification filler;

[0052] There are multiple purification filter cloths 31, which are evenly distributed inside the purification chamber 3; the ends of the purification filter cloths 31 are connected to the inner wall of the purification chamber 3 close to the outside, and the middle position of the purification filter cloths 31 is connected to the cleaning ring 34 on the outer surface of the limiting net 41;

[0053] The internal area of ​​the purification chamber 3 is divided into a plurality of relatively independent absorption zones 33 and buffer zones 32, and the cross section of the absorption zone 33 is triangular; because the purification fillers in the purification chamber 3 are evenly distributed in the plurality of relatively independent absorption zones 33, it is avoided that the purification fillers in the purification chamber 3 are locally aggregated and unevenly distributed due to the moving processing of the working body 121, thereby affecting the purification efficiency of the flue gas;

[0054] A guide tube 35 is disposed inside the collection hole 123 , the end of the guide tube 35 extends through the purification chamber 3 , and a connecting hole 351 is disposed on the side wall of the guide tube 35 , which enables the absorption area 33 and the collection hole 123 to communicate with each other.

[0055] Specific workflow: Based on the specific workflow in the first embodiment, during the workpiece processing, under the action of negative pressure, the smoke pollutants generated are sucked into the collection hole 123, flow inward along the corresponding connected guide pipe 35, and then flow into the absorption area 33 from the evenly distributed connecting holes 351, and contact with the purification filler in the absorption area 33, so that the pollutants in the smoke are filtered and adsorbed by the purification filler, and then are filtered and purified again when passing through the purification filter cloth 31, and then flow into the buffer zone 32, and flow from the buffer zone 32 to the collection chamber 4 for recycling;

[0056] Through the guiding and diverting effect of the guide pipe 35, the air mixed with smoke and dust flowing in is dispersed into each absorption zone 33, and fully contacts with the purification filler therein, thereby improving the contact degree between the smoke and the purification filler and the purification efficiency of the smoke and dust; this can also effectively avoid the problem of uneven distribution of smoke and dust in the purification filler, resulting in local enrichment and affecting air flow, and effectively improve the utilization efficiency of the purification filler;

[0057] Under the impact of the incoming flue gas, the absorption area 33 surrounded by the elastic purification filter cloth 31 can be inflated and deformed, and reset after the exhaust is completed. The buffer zone 32 provides space for the absorption area 33 to expand, and the purification filler inside the absorption area 33 is impacted and fully flows during the expansion and recovery process of the absorption area 33, thereby avoiding the tendency of some purification fillers to aggregate and clump due to the adhered particulate impurities, and ensuring that the purification fillers can function normally;

[0058] In addition, the buffer zone 32 is located in the gap area between the purification filter cloth 31 and the limiting net 41, providing a flow space for the smoke passing through the purification filter cloth 31, so that it can flow smoothly in the buffer zone 32, and increase the impact of the air flow inside the buffer zone 32, so that the smoke dust adhering to the limiting net 41 is difficult to accumulate. While ensuring the passability of the limiting net 41, the high-temperature particles in the smoke flowing into the buffer zone 32 can be fully cooled, reducing their adhesion to the limiting net 41 and making it difficult to clean.

[0059] Embodiment three:

[0060] On the basis of the second embodiment, one end of the purification filter cloth 31 is connected to the fixed ring 36 on the inner wall of the purification chamber 3, and the other end is connected to the sliding ring 37 on the inner wall of the purification chamber 3. The fixed ring 36 is fixedly connected to the inner wall of the purification chamber 3, and the sliding ring 37 is slidably connected to the inner wall of the purification chamber 3.

[0061] The guide tube 35 is slidably connected to the inner wall of the collecting hole 123, and the guide tube 35 extends through each fixed ring 36 and the sliding ring 37, and the guide tube 35 is slidably connected to the fixed ring 36; the end of the guide tube 35 away from the collecting hole 123 is connected to the telescopic device 352 set on the inner wall of the purification chamber 3, and the telescopic device 352 here can use an existing micro-electric telescopic rod device; the outer surface of the end of the guide tube 35 corresponding to the collecting hole 123 is evenly provided with suction holes 353, and the suction holes 353 are communicated with the inside of the guide tube 35.

[0062] Specific workflow: Based on the specific workflow in the second embodiment, since the working head 122 of the present application and the workpiece are non-contact processing, there is a certain processing gap; therefore, during the processing, the telescopic device 352 can be controlled to start and drive the end of the guide tube 35 to move and extend, fill the processing gap, and the end of the guide tube 35 is close to or even contacts the surface of the workpiece; a pressure sensor is set at the end of the guide tube 35, so that when the pressure between the end of the guide tube 35 and the surface of the workpiece increases, it is automatically fed back to the numerical control system, and the telescopic device 352 is stopped, so as to avoid the end of the guide tube 35 pushing the workpiece to move and affect the accuracy of the processing position;

[0063] The extended guide pipe 35 further surrounds the processing position between the working head 122 and the workpiece surface in the processing gap area, and the generated smoke is surrounded by the guide pipe 35 and is fully sucked into the guide pipe 35, reducing the outward diffusion range of the smoke and improving the recovery efficiency of the smoke; and during the movement of the guide pipe 35, the corresponding connecting hole 351 on the guide pipe 35 is always maintained in the corresponding absorption area 33, and the guide pipe 35 slides relative to the fixed ring 36, and pulls the sliding ring 37 to move synchronously, so that when the guide pipe 35 is extended, the sliding ring 37 corresponding to the same absorption area 33 moves toward the direction close to the fixed ring 36. The cleaning filter cloth 31 on both sides of the cleaning ring 34 is folded toward the middle, the space of the absorption zone 33 is reduced, the internal purification filler is squeezed, and the inflowing exhaust gas is accelerated to pass through the gap of the purification filler during the squeezing process and penetrate outward through the purification filter cloth 31; the exhaust gas is accelerated to pass through the purification filler under pressure and impact the surface of the purification filler, and the purification filler is impacted during the folding and squeezing process of the purification filter cloth 31, and the vibration is strengthened, which intensifies the flow of the purification filler, and the purification fillers inside the absorption zone 33 are mixed with each other, reducing the situation where the adsorbed smoke impurities are locally enriched and affect the flow;

[0064] And when the telescopic device 352 controls the guide tube 35 to reset, the space size of the absorption zone 33 is restored. During this process, the vibration inside the absorption zone 33 promotes the enhancement of the flow friction between the purification filler and the purification filter cloth 31, so that the particulate impurities adsorbed on the inner wall of the purification filter cloth 31 fall off under the action of vibration friction, thereby ensuring the passability of the purification filter cloth 31.

[0065] Embodiment 4:

[0066] On the basis of the third embodiment, a collecting ring 38 is arranged around the working head 122 at the end of the working body 121, and the collecting ring 38 is connected to the guide tube 35; the collecting ring 38 is hollow inside, and intercepting holes 381 are evenly arranged on the inner wall of the collecting ring 38, the intercepting holes 381 point to the working head 122, and the intercepting holes 381 are conical holes, and the guide tube 35 is connected to the hollow area inside the collecting ring 38.

[0067] Specific work flow: On the basis of the specific work flow in Example 3, the collecting ring 38 is driven by the end of the guide pipe 35 to surround the processing position, thereby increasing the absorption area of ​​the smoke generated by the processing, so that the smoke generated by the processing is fully intercepted by the collecting ring 38 after flowing out and is sucked into the hollow area inside the collecting ring 38, and then flows into the absorption area 33 along the connected guide pipe 35, thereby effectively improving the purification efficiency of the electrical processing smoke and improving the processing environment.

[0068] Embodiment five:

[0069] On the basis of the fourth embodiment, the outer surface of the limiting net 41 is slidably connected to the cleaning ring 34, and bristles are evenly arranged on the inner wall of the cleaning ring 34, and the ends of the bristles are in contact with the outer surface of the limiting net 41;

[0070] An air collecting groove 341 is provided on the outer surface of the cleaning ring 34 facing the gap between the purification filter cloths 31, and a flushing hole 342 is provided on the inner wall of the cleaning ring 34 located at the gap between the bristles. The flushing hole 342 is communicated with the inside of the air collecting groove 341, and the thickness of the purification filter cloth 31 corresponding to the air collecting groove 341 is lower than the thickness of other parts.

[0071] Specific work flow: Based on the specific work flow in the fourth embodiment, during the movement of the sliding ring 37 toward the fixed ring 36, the two sides of the purification filter cloth 31 are brought close to each other. During this process, the cleaning ring 34 slides downward along the outer surface of the limiting net 41 due to the pushing action of the sliding ring 37. At the same time, the bristles on the inner wall of the cleaning ring 34 scrape the outer surface of the limiting net 41. The scraping action of the bristles causes the adsorbed particulate impurities on the outer surface of the limiting net 41 to fall off downward, thereby ensuring the passability of the limiting net 41.

[0072] Furthermore, because the thickness of the purification filter cloth 31 corresponding to the gas collecting groove 341 is relatively small, the exhaust gas flowing into the absorption zone 33 passes through the purification filter cloth 31 and the corresponding part of the gas collecting groove 341 after passing through the purification filler, and flows into the gas collecting groove 341 with relatively little obstruction; therefore, in the process of the sliding ring 37 moving downward to squeeze the absorption zone 33, the air inside the absorption zone 33 can be concentrated to pass through the middle part of the purification filter cloth 31 and flow into the gas collecting groove 341, forming a concentrated impact airflow, which then passes through the scouring hole 342 to impact the surface of the limiting net 41, causing the particulate impurities adhered to the surface of the limiting net 41 to fall off under the impact and vibration of the airflow;

[0073] The airflow out of the flushing hole 342 passes through the gaps between the bristles and takes away the particulate impurities adhered to the gaps between the bristles. Then the airflow penetrates along the gap between the inner wall of the cleaning ring 34 and the limiting net 41, and forms a vertical impact airflow, so that the outer surface of the limiting net 41 is subjected to the tangential impact of the vertical airflow, thereby increasing the range of action of the flushing airflow and ensuring the passability of the limiting net 41.

[0074] Embodiment six:

[0075] On the basis of Example 5, the fixed ring 36 is connected to the cleaning ring 34 through a limiting rod 343, and the sliding ring 37 is also connected to the cleaning ring 34 through a limiting rod 343. The limiting rod 343 is made of elastic material, and the limiting rods 343 are all connected to the outer surface of the adjacent purification filter cloth 31; a guide rod 39 is vertically arranged inside the purification wall, and the guide rod 39 is distributed in a ring shape around the limiting net 41, and the guide rod 39 is slidably connected to the cleaning ring 34.

[0076] Specific working process: Based on the specific working process in the fifth embodiment, the setting of the guide rod 39 makes the vertical sliding of the cleaning ring 34 follow a stable motion trajectory, so that the vertical sliding of the cleaning ring 34 is smoother; and in the process of vertical movement of the sliding ring 37, the sliding ring 37 moves downward to drive the cleaning ring 34 to move, and in this process, the limiting rod 343 squeezes the connected purification filter cloth 31 so that it is close to each other and folded; and because the purification filter cloth 31 is made of elastic and easily deformable material, during the folding process, the difference in deformation degree between the part of the purification filter cloth 31 connected to the limiting rod 343 and the part between the limiting rod 343 causes the purification filter cloth 31 to be pulled and deformed, so that the particulate impurities adhering to the inner wall of the purification filter cloth 31 fall off;

[0077] As the limiting rod 343 rotates from an inclined state toward a horizontal state, the spacing between the sliding ring 37, the fixing ring 36 and the cleaning ring 34 decreases, causing the limiting rod 343 to be squeezed and deformed into an arc shape. When the sliding ring 37 is reset, it drives the limiting rod 343 to be reset, so that the limiting rod 343 is deformed and restored. In this way, the switching between the tight deformation and the relaxation recovery state of the limiting rod 343 drives the connected purification filter cloth 31 to tighten and relax. The shaking action causes the particulate impurities adhering to the inner wall of the purification filter cloth 31 to fall off, thereby ensuring the passability of the purification filter cloth 31.

[0078] Embodiment seven:

[0079] Based on the sixth embodiment, as shown in the attached Figure 8 As shown, a method for electromachining a double-layer turbine blade air film cooling groove is provided. The machining method uses the above-mentioned machining equipment. The specific steps of the machining method are as follows:

[0080] S1: First, mark the position of the film cooling groove on the double-layer turbine blade to be processed, use non-destructive testing technology to measure the thickness value of the position of the double-layer turbine blade to be processed, and combine the size information of the double-layer turbine blade to input it into the CNC system of the machining center to generate a machining program;

[0081] S2: Check the processing program. After judging that it is correct, fix the double-layer turbine blade to be processed to the limit fixture inside the processing room 11 through the corresponding fixture. Then the processing personnel drive the laser processing head 12 to the processing position on the double-layer turbine blade by operating the CNC system. The laser processing head 12 generates a high-energy laser beam to process the double-layer turbine blade.

[0082] S3: During the processing, the closed door is started to close the opening of the processing chamber 11, and the fan equipment connected to the exhaust pipe 2 is started to absorb and purify the smoke generated by the processing; and after the processing is completed, the air film cooling groove on the double-layer turbine blade is measured to detect whether it meets the processing accuracy.

[0083] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A double-layer turbine blade air film cooling groove electrical processing equipment, the processing equipment comprising a processing center, the processing center comprising a processing body (1), a processing chamber (11) is arranged on the processing body (1), a limit fixture is arranged at the bottom of the processing chamber (11), a laser processing head (12) is arranged on the upper side of the processing chamber (11), and the laser processing head (12) performs laser processing on the double-layer turbine blade workpiece on the limit fixture under the control of a numerical control system; Features: The processing chamber (11) is in communication with a smoke purification device, and smoke exhaust gas generated in the inner area of ​​the processing chamber (11) is guided to the smoke purification device for treatment through an exhaust pipe (2); The laser processing head (12) comprises a working body (121) and a working head (122), wherein the working head (122) is located at the end of the processing body (1), and the working body (121) and the processing body (1) are controlled by a position control system; an energy supply component is arranged in the middle of the working body (121), and an annular purification chamber (3) and a collection chamber (4) are arranged outside the energy supply component, the purification chamber (3) is located outside the collection chamber (4), and the collection chamber (4) is connected to the exhaust pipe (2) through a connecting pipe (42); The purification chamber (3) and the collection chamber (4) are separated by an annular limiting net (41); a purification filler is arranged inside the purification chamber (3); a collection hole (123) is arranged at the end of the working body (121) around the working head (122); and the collection hole (123) is communicated with the interior of the purification chamber (3).

2. The double-layer turbine blade film cooling groove electromachining equipment according to claim 1, characterized in that: A purification filter cloth (31) is arranged inside the purification chamber (3), and the area between the purification filter cloth (31) and the limiting net (41) is a buffer zone (32); The hollow area between the purification filter cloth (31) and the purification chamber (3) close to the outer inner wall is an absorption zone (33); the absorption zone (33) is in communication with the collection hole (123), and the absorption zone (33) is filled with purification filler.

3. The double-layer turbine blade film cooling groove electrical machining equipment according to claim 2, characterized in that: There are a plurality of purification filter cloths (31) which are evenly distributed inside the purification chamber (3); both ends of the purification filter cloths (31) are connected to the inner wall of the purification chamber (3) close to the outer side, and the middle position of the purification filter cloth (31) is connected to the cleaning ring (34) on the outer surface of the limiting net (41); The internal area of ​​the purification chamber (3) is divided into a plurality of absorption zones (33) and buffer zones (32), and the cross-section of the absorption zone (33) is triangular; a guide tube (35) is provided inside the collection hole (123), the end of the guide tube (35) extends through the interior of the purification chamber (3), and a connecting hole (351) is provided on the side wall of the guide tube (35), and the connecting hole (351) enables the absorption zone (33) and the collection hole (123) to communicate with each other.

4. The double-layer turbine blade film cooling groove electromachining equipment according to claim 3, characterized in that: One end of the purification filter cloth (31) is connected to a fixed ring (36) on the inner wall of the purification chamber (3), and the other end is connected to a sliding ring (37) on the inner wall of the purification chamber (3); the fixed ring (36) is fixedly connected to the inner wall of the purification chamber (3), and the sliding ring (37) is slidably connected to the inner wall of the purification chamber (3); The guide tube (35) is slidably connected to the inner wall of the collecting hole (123), and the guide tube (35) extends through each fixed ring (36) and the sliding ring (37), and the guide tube (35) is slidably connected to the fixed ring (36); and the end of the guide tube (35) away from the collecting hole (123) is connected to the telescopic end of the telescopic device (352) arranged on the inner wall of the purification chamber (3).

5. The double-layer turbine blade film cooling groove electrical machining equipment according to claim 4, characterized in that: Air suction holes (353) are evenly arranged on the outer surface of the end portion of the flow guide tube (35) corresponding to the collecting hole (123), and the air suction holes (353) are communicated with the interior of the flow guide tube (35).

6. The double-layer turbine blade film cooling groove electrical machining equipment according to claim 5, characterized in that: A collecting ring (38) is arranged at the end of the working body (121) around the working head (122), and the collecting ring (38) is connected to the guide tube (35); the interior of the collecting ring (38) is hollow, and interception holes (381) are evenly arranged on the inner wall of the collecting ring (38), the interception holes (381) point to the working head (122), and the interception holes (381) are conical holes, and the guide tube (35) is in communication with the hollow interior of the collecting ring (38).

7. The double-layer turbine blade film cooling groove electrical machining equipment according to claim 6, characterized in that: The outer surface of the limiting net (41) is slidably connected to the cleaning ring (34), and bristles are evenly arranged on the inner wall of the cleaning ring (34), and the ends of the bristles are in contact with the outer surface of the limiting net (41).

8. The double-layer turbine blade film cooling groove electrical machining equipment according to claim 7, characterized in that: An air collecting groove (341) is arranged on the outer surface of the cleaning ring (34) facing the gap between the purification filter cloths (31), and a flushing hole (342) is arranged on the inner wall of the cleaning ring (34) at the gap between the bristles, and the flushing hole (342) is communicated with the inside of the air collecting groove (341).

9. The double-layer turbine blade film cooling groove electromachining equipment according to claim 8, characterized in that: The fixed ring (36) and the cleaning ring (34) are connected via a limiting rod (343), and the sliding ring (37) and the cleaning ring (34) are also connected via a limiting rod (343); The limiting rods (343) are made of elastic material, and the limiting rods (343) are connected to the outer surface of the adjacent purification filter cloth (31); a guide rod (39) is vertically arranged inside the purification chamber (3), and the guide rod (39) is distributed in a ring shape around the limiting net (41), and the guide rod (39) is slidably connected to the cleaning ring (34).

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