A local precipitation hardening treatment device for nickel-based alloy forging

Abstract

The present invention belongs to the technical field of heat treatment of forgings, and specifically is a local precipitation hardening treatment device for nickel-based alloy forging, comprising a local heat treatment body, the local heat treatment body comprising a PLC control center and a treatment tank, a quenching liquid circulation system being provided at the bottom of the treatment tank, an L-shaped mounting platform being provided inside the treatment tank, and a vertical portion of the mounting platform being connected to the inner wall of the treatment tank via a vertical transmission mechanism; the present invention provides a protective cover on a limit seat on the upper side of the forging, and an absorption hole being provided on the inner wall of the protective cover, the absorption hole being able to inhale air from the lower area of ​​the protective cover, recovering the flue gas generated by the high temperature of the forging and introducing it into external purification equipment, thereby achieving absorption and purification of the polluted gas generated during forging processing, thereby reducing the adverse effects of the emission of quenching flue gas on the surrounding environment and improving the working environment of the operator.

Description

Technical Field

[0001] The invention belongs to the technical field of heat treatment of forgings, in particular to a local precipitation hardening treatment device for nickel-based alloy forging. Background Art

[0002] Nickel-based alloys are based on nickel and contain elements such as chromium, molybdenum, and titanium. They have excellent high-temperature strength (700-950°C), creep resistance, and corrosion resistance, and are widely used in key components such as aircraft engine turbine discs and petrochemical reactors.

[0003] Traditional overall precipitation hardening requires high-temperature solution and aging treatment, which has the following problems:

[0004] (1) High energy consumption: Overall heating results in high energy consumption and is prone to oxidation and deformation.

[0005] (2) Performance homogeneity: Unable to meet the local high performance requirements of complex components (such as high fatigue strength in the turbine disc hole area and creep resistance at the edge).

[0006] (3) Processing limitations: The material hardness is high after overall processing, and subsequent machining is difficult.

[0007] Therefore, as material performance requirements increase, gradient performance needs to be achieved within the same component. Local precipitation hardening technology has emerged to achieve on-demand strengthening through selective heat treatment. The local precipitation hardening process for nickel-based alloy forging is a key technology for optimizing performance in specific areas under complex working conditions. Its core lies in regulating the microstructure through selective heat treatment to achieve a precise balance of strength, corrosion resistance, and toughness.

[0008] The smoke generated during the heat treatment process of the local heat treatment parts of the forgings contains pollutants such as metal dust formed by the high-temperature vaporization of the oxide layer on the surface of the forgings and smoke generated by the high temperature of oil. These fumes spread in the processing area and may adhere to the surface of the forgings or the internal processing parts of the heat treatment equipment, increasing the subsequent cleaning workload. They may also be emitted into the processing workshop, resulting in an increase in harmful substances in the processing environment in the workshop, affecting the health and safety of the operators. Summary of the Invention

[0009] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes a local precipitation hardening treatment device for nickel-based alloy forging.

[0010] The technical solution adopted by the present invention to solve the technical problem is as follows: the present invention provides a local precipitation hardening treatment device for nickel-based alloy forging, comprising a local heat treatment body, the local heat treatment body including a PLC control center and a treatment tank, a quenching liquid circulation system is provided at the bottom of the treatment tank, an L-shaped mounting platform is provided inside the treatment tank, and the vertical portion of the mounting platform is connected to the inner wall of the treatment tank via a vertical transmission mechanism;

[0011] A positioning seat is provided at the bottom of the mounting table, a positioning block is provided at the top of the positioning seat, a slot is provided at the top of the positioning block, and a limit seat is provided on the mounting table at the upper side of the slot. The limit seat limits the forging by cooperating with the slot through the block at the bottom;

[0012] An induction coil is provided on the side wall of the processing tank around the positioning seat, a water cooling channel is provided inside the induction coil, and a quenching nozzle is provided on the induction coil;

[0013] A protective cover is provided on the limiting seat, an absorption hole is provided on the inner wall of the protective cover, and the absorption hole is communicated with external purification equipment.

[0014] Preferably, the induction coil forms a multi-circle structure around the positioning seat, the quenching nozzle is located on the inner ring surface of the innermost induction coil, and the opening points to the central positioning seat;

[0015] The upper surface of the induction coil of the outermost circle is provided with purification spray holes, which are distributed in a ring shape around the positioning seat and point to the protective cover.

[0016] Preferably, protective air holes are provided on the top of the positioning seat, the protective air holes are communicated with the protective gas supply system, and the protective air holes are distributed in a ring around the card slot, and the top openings of the protective air holes point to the absorption hole.

[0017] Preferably, an absorption layer is evenly laid on the inner wall surface of the protective cover, the absorption layer is made of a loose porous material, and the edge of the absorption layer extends to the edge of the lower surface of the protective cover.

[0018] Preferably, an interception ring is provided at the edge of the protective cover, and the outer edge of the interception ring protrudes vertically downward;

[0019] A guide groove is provided on the lower surface of the interception ring, and the end of the guide groove extends through the gap area between the protective cover and the absorption layer and is close to the lower side of the absorption hole.

[0020] Preferably, a guide pipe is provided inside the guide groove, the diameter of the guide pipe is smaller than the cross-sectional area of ​​the guide groove, and the opening of the end of the guide pipe extends to the lower side of the absorption hole and is inclined downward to the surface of the block;

[0021] The outer surface of the guide tube is evenly provided with collecting holes, and the surface of the absorption layer is evenly provided with ventilation holes, and the positions of the ventilation holes and the positions of the collecting holes are staggered with each other.

[0022] Preferably, the lower surface of the protective cover is a sloped structure, and the portion of the lower surface of the protective cover close to the absorption hole is lower than the portion away from the absorption hole.

[0023] Preferably, expansion parts are evenly arranged on the guide tube, the cross-section of the expansion parts is larger than the cross-section area of ​​other parts of the guide tube, and the side walls of the expansion parts are made of elastic material.

[0024] Preferably, the middle portion of the card slot bulges upward to form an arc-shaped bulge structure, and debris removal holes are evenly arranged on the inner wall of the card slot, and the debris removal holes are located at the bottom of the inner edge area of ​​the card slot.

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

[0026] The present invention relates to a local precipitation hardening treatment device for nickel-based alloy forging, in which a protective cover is provided on a limit seat on the upper side of the forging, and an absorption hole is provided on the inner wall of the protective cover. When the induction coil is started, the external purification equipment is started at the same time, and the air in the lower area of ​​the protective cover is sucked in through the connected recovery pipe and the absorption hole. After forming a negative pressure, the smoke generated by the high temperature of the forging is prompted to flow upward close to the protective cover, and is sucked in by the absorption hole, and flows into the external purification equipment along the recovery pipe, thereby realizing the absorption and purification of the polluted gas generated during the forging processing, thereby reducing the adverse effects of the quenching smoke on the surrounding environment and improving the working environment of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 It is a perspective view of the present invention;

[0029] Figure 2 It is a partial cross-sectional view of the present invention in the front view direction;

[0030] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0031] Figure 4 yes Figure 2 A partial enlarged view of point B in the middle;

[0032] Figure 5 yes Figure 3 A partial enlarged view of point C in the middle;

[0033] Figure 6 is a perspective view of the mounting platform of the present invention;

[0034] Figure 7 It is a three-dimensional diagram of the positioning block in the present invention;

[0035] Figure 8 It is a schematic diagram of the partial structure of the induction coil in the present invention;

[0036] Figure 9 It is a partial cross-sectional view of the flow guide tube in the present invention.

[0037] In the figure: local heat treatment body 1, treatment tank 11, mounting platform 12, positioning seat 13, positioning block 131, card slot 132, protective air hole 133, impurity removal hole 134, limit seat 14, card block 141, induction coil 15, water cooling channel 151, quenching nozzle 152, purification nozzle 153, protective cover 16, absorption hole 161, absorption layer 162, intercepting ring 163, guide groove 164, guide pipe 165, collecting hole 166, air vent 167, expansion part 168. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings shown in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0039] Example 1:

[0040] As shown in the accompanying drawings Figures 1-9 As shown, the present application proposes a local precipitation hardening treatment device for nickel-based alloy forging, including a local heat treatment body 1, which includes a PLC control center and a treatment tank 11. The PLC control center can specifically use a control system configured with existing intelligent quenching equipment to input the temperature, time and other requirements of the local precipitation hardening treatment to achieve automated processing;

[0041] A quenching liquid circulation system is provided at the bottom of the processing tank 11. The quenching liquid circulation purification treatment system of the intelligent quenching equipment in the prior art can be selected to achieve filtration and purification of the quenching liquid. An L-shaped mounting platform 12 is provided inside the processing tank 11. The vertical portion of the mounting platform 12 is connected to the inner wall of the processing tank 11 through a vertical transmission mechanism. The vertical transmission mechanism can adopt the existing electric slider and electric slide rail matching technology to achieve automatic vertical movement of the mounting platform 12 under the control of the PLC control center.

[0042] A positioning seat 13 is provided on the horizontal portion of the mounting platform 12. A positioning block 131 is provided on the positioning seat 13. A slot 132 is provided on the positioning block 131. The positioning block 131 and the positioning seat 13 are detachable. Based on the size of the bottom of the forging to be processed, the positioning block 131 corresponding to the appropriate slot 132 is selected to participate in the positioning of the forging, so that it can adapt to the processing of forgings of different sizes. A limiting seat 14 is provided on the upper side of the slot 132 of the mounting platform 12. The limiting seat 14 is connected to the vertical portion of the mounting platform 12 through a support plate, and the limiting seat 14 is rotatably connected to the output end of the telescopic device on the support plate. The telescopic device is controlled by a PLC control center.

[0043] An induction coil 15 is provided on the side wall of the treatment tank 11 around the positioning seat 13. A water cooling channel 151 is provided inside the induction coil 15. The water cooling channel 151 is connected to the external water supply system through a supply pipe. A quenching nozzle 152 is provided on the induction coil 15.

[0044] A clamping block 141 is rotatably provided at the bottom of the limit seat 14, and a protective cover 16 is provided in the area above the clamping block 141 on the side wall of the limit seat 14. An absorption hole 161 is provided on the inner wall of the protective cover 16. The absorption hole 161 is communicated with the external quenching waste gas purification equipment through a recovery pipe connected to the outside of the protective cover 16.

[0045] Specific work flow: For nickel-based alloy forgings, in order to avoid failures such as wear, fatigue and corrosion at local locations during use, which may damage the entire nickel-based alloy forging and lead to safety accidents, it is necessary to perform heat treatment on important local locations to achieve precipitation hardening at local locations and improve the performance of the entire nickel-based alloy forging;

[0046] The present application is suitable for the automated processing of small-volume rod-shaped nickel-based alloy forgings. Specifically, the protective door of the processing tank 11 is automatically opened, and the forgings evenly arranged on the outside are placed on the upper side of the positioning seat 13 by an automatic robotic arm. The diameter of the slot 132 on the positioning block 131 at the top of the positioning seat 13 is adapted to the diameter of the forging, so that the bottom of the forging slides and fits into the slot 132. The telescopic device on the upper side is activated to drive the limit seat 14 downward, so that the tapered end of the block 141 at the bottom of the limit seat 14 abuts against the middle position of the top of the forging, and the forging is clamped and fixed in the vertical direction.

[0047] After the limit fixation is completed, the automatic robot arm withdraws and the protective door of the processing tank 11 is closed. The mounting platform 12 drives the fixed forging to move vertically under the adjustment of the vertical transmission mechanism, so that the induction coil 15 originally surrounding the positioning seat 13 moves vertically relative to the forging until the induction coil 15 moves to the local position to be processed on the forging; after power is turned on, according to the principle of electromagnetic quenching, the local position of the forging surrounded by the induction coil 15 is heated to a predetermined temperature and kept warm for a period of time, during which the alloy elements therein are fully dissolved; then the external water supply system is started to pressurize the water-based quenching liquid and send it into the water cooling channel 15 1, while the induction coil 15 is being cooled, the quenching nozzles 152 evenly distributed on the inner wall of the induction coil 15 are discharged to impact the local heat treatment area on the forging, causing it to cool rapidly and completing the local quenching treatment; and the positioning block 131 can be connected to the driving device inside the positioning seat 13, and the clamping block 141 is connected to the output end of the driving device inside the limiting seat 14, and the driving devices on the upper and lower sides are driven to rotate synchronously, so that during the quenching treatment process, the positioning block 131 and the clamping block 141 are controlled to drive the middle forging to rotate, so that the heating of the local position of the forging and the subsequent quenching cooling are more uniform;

[0048] After the treatment is completed, the cleaned forging is grabbed by the robotic arm and sent to the outside to be moved to the next process for aging treatment. At the same time, the new forging to be processed is taken out and placed between the clamping groove 132 and the clamping block 141 to receive local quenching treatment. The above process is repeated to realize automated linked processing. In this process, the smoke generated during the heat treatment of the local heat treatment part of the forging during the quenching process contains metal dust formed by the high-temperature vaporization of the oxide layer on the surface of the forging and smoke generated by the high temperature of oil. Such pollutants spread in the processing area and may adhere to the surface of the forging or the processed parts inside the processing tank 11, increasing the workload of subsequent cleaning. It may also be dispersed into the processing workshop, resulting in an increase in harmful substances in the processing environment in the workshop, affecting the health and safety of the operators.

[0049] Therefore, a protective cover 16 is provided on the limit seat 14 on the upper side of the forging, and an absorption hole 161 is provided on the inner wall of the protective cover 16. When the induction coil 15 is started, the external purification equipment is started at the same time, and the air in the lower area of ​​the protective cover 16 is sucked in through the connected recovery pipe and the absorption hole 161. After forming a negative pressure, the flue gas generated by the high temperature of the forging is prompted to flow upward and close to the protective cover 16, and is sucked in by the absorption hole 161, and flows into the external purification equipment along the recovery pipe, thereby realizing the absorption and purification of the polluted gas generated during the forging processing, thereby reducing the adverse effects of the quenching flue gas on the surrounding environment and improving the working environment of the operator.

[0050] Furthermore, the middle part of the slot 132 is provided with an upward protrusion to form an arc-shaped protrusion structure, and impurity removal holes 134 are evenly provided on the inner wall of the slot 132. The impurity removal holes 134 are located at the bottom position of the inner edge area of ​​the slot 132. In this way, when the bottom of the forging slides into the slot 132, the bottom of the forging is lifted up by the arc-shaped protrusion, so that a gap is maintained between the inner surface of the bottom of the slot 132 and the bottom of the forging, which facilitates the infiltration and inflow of water flowing downward along the forging, and takes away the particulate impurities enriched on the inner wall of the slot 132, and flows out from the impurity removal holes 134, thereby preventing the residual particulate impurities from affecting the relative fixation of the bottom of the forging and the slot 132.

[0051] Example 2:

[0052] On the basis of the first embodiment, the induction coil 15 forms a multi-circle structure around the positioning seat 13, and the quenching nozzle 152 is located on the inner surface of the innermost circle of the induction coil 15, pointing to the central positioning seat 13;

[0053] The upper surface of the outermost circle of the induction coil 15 is provided with purification spray holes 153 . The purification spray holes 153 are distributed in a ring shape around the positioning seat 13 and point to the edge end of the protective cover 16 .

[0054] Specific workflow: Based on the specific workflow in Example 1, in order to better intercept the flue gas that tends to diverge outward during the processing, the external water supply system is activated at the same time as the absorption hole 161 is activated to send pressurized water to the water cooling channel 151 corresponding to the purification nozzle 153, so that the pressurized water flows out of the purification nozzle 153 to form an impact water flow directed upward toward the edge of the protective cover 16, and the impact water flow can impact the edge end of the protective cover 16 that it contacts;

[0055] Because the purification nozzles 153 are annularly distributed, the annularly distributed impact water flow cooperates with the upper protective cover 16 to surround the flue gas that diverges upwards; when the flue gas contacts the impact water flow, it is intercepted, and the particulate impurities and soluble gas pollutants in the flue gas will contact and mix into the water flow, and then fall to the bottom of the treatment tank 11 and participate in the quenching liquid circulation system. In this way, while purifying the quenching flue gas, it is prevented from diverging outward, so that it is confined to the surrounding area and fully collected by the absorption holes 161 of the protective cover 16, further reducing the overflow of the quenching flue gas and improving the purification efficiency of the quenching flue gas; and because the impact water flow contacts the quenching flue gas, the moisture content of the recovered quenching flue gas is increased, prompting the particulate impurities therein to combine with the moisture and accelerate sedimentation, while also reducing the temperature of the quenching flue gas, reducing the burning erosion of the contact parts of the recovery pipe and the recovery equipment during the recovery process;

[0056] Furthermore, the protective cover 16 cooperates with the annularly distributed impact water flow to purify and limit the flue gas, so that there is no need to set a closed gas interception structure at the processing position as in the prior art, avoiding the adverse effect of the closed gas interception structure causing inconvenience in loading and unloading, and can also achieve sufficient collection of quenching flue gas;

[0057] Furthermore, regarding the water-cooling channels 151 corresponding to the purification nozzle 153 and the quenching nozzle 152, since there may be a situation where the purification nozzle 153 and the quenching nozzle 152 do not need to spray water synchronously, the water-cooling channels 151 corresponding to the purification nozzle 153 and the quenching nozzle 152 can be set to be relatively independent and belong to different relatively independent pipelines, which can be controlled separately. During specific operations, selection can be made based on actual needs.

[0058] Example 3:

[0059] On the basis of Example 2, a protective air hole 133 is set at the top of the positioning seat 13 near the positioning block 131. The protective air hole 133 is distributed in a ring around the central axis of the slot 132, and the protective air hole 133 is connected to the protective gas supply system. The protective air hole 133 is distributed in a ring around the slot 132, and the top opening of the protective air hole 133 points to the absorption hole 161.

[0060] Specific workflow: Based on the specific workflow in Example 2, in order to detect high-temperature oxidation during the local quenching process, which causes an oxide layer to appear at the local heat treatment position of the forging after high temperature exposure, the shielding gas supply system is started, and the shielding gas in the shielding gas tank is introduced into the shielding gas hole 133 through the air pump device, and is released from the top opening of the shielding gas hole 133 so that it points to the middle forging and flows upward. The type of shielding gas can be an inert gas or a high-concentration nitrogen gas.

[0061] Because the protective gas holes 133 are distributed in an annular manner around the card slot 132, and the absorption holes 161 on the inner wall of the protective cover 16 are distributed in an annular manner around the card block 141, while the protective gas holes 133 release the protective gas, the absorption holes 161 begin to absorb the waste gas generated during the heat treatment process and form a negative pressure in the area around the card block 141, so that the released protective gas maintains an upward flow path close to the top card block 141, so that the protective gas flows upward while surrounding the middle forging in an annular manner and effectively covers the high-temperature heat treatment position on the forging, preventing external oxygen from contacting the high-temperature heat treatment position to form an oxide layer;

[0062] At this time, the upward-flowing protective gas layer around the forging accelerates the air flow rate around the forging, causing the air on the outside to tend to move closer to the middle due to the flow rate difference, thereby preventing the exhaust gas formed in the local quenching treatment from diverging to the surroundings and concentrating toward the middle area under the action of the pressure difference. As the protective gas flows upward, it is fully absorbed by the absorption hole 161 at the top, further reducing the overflow of the exhaust gas and improving the recovery efficiency of the protective gas and exhaust gas.

[0063] Example 4:

[0064] On the basis of the third embodiment, an absorption layer 162 is evenly laid on the inner wall surface of the protective cover 16. The absorption layer 162 is made of a porous elastic material, which can be a chemical fiber cloth material, a fire-resistant asbestos cloth material, or a filter cloth, a filter screen, etc., and the edge of the absorption layer 162 extends to the bottom edge of the protective cover 16;

[0065] An interception ring 163 is provided at the edge of the protective cover 16. The outer edge of the interception ring 163 protrudes vertically up and down, and a guide groove 164 is provided on the lower surface of the interception ring 163. The end of the guide groove 164 extends through the gap between the inner wall of the protective cover 16 and the absorption layer 162 and is close to the lower side of the absorption hole 161.

[0066] Specific work flow: Based on the specific work flow in Example 3, as the purification nozzle 153 sprays the intercepted water flow upward, the flow path of the intercepted water flow is set to coincide with the interception ring 163, so that the intercepted water flow contacts the lower surface of the interception ring 163 and is restricted by the raised portion of the lower surface of the interception ring 163, prompting the water flow to flow along the lower surface of the interception ring 163; because the guide groove 164 is provided and the lower surface of the protective cover 16 is made of a hydrophilic material, the water flow restricted in the area of ​​the interception ring 163 contacts the guide groove 164, flows downward along the guide groove 164 into the gap area between the absorption layer 162 and the protective cover 16, and wets the absorption layer 162 from the inside. The water flow contacts the absorption layer 162 and penetrates into the interior of the absorption layer 162, so that the absorption layer 162 is fully combined with the water flow;

[0067] In this way, when the high-temperature flue gas generated during the high-temperature quenching process contacts the absorption layer 162, the absorption layer 162 fully absorbs water, thereby reducing the possibility of the surface of the absorption layer 162 being burned and damaged by the high-temperature flue gas. At the same time, the presence of the absorption layer 162 also prevents the high-temperature flue gas from directly contacting the protective cover 16, thereby preventing the high-temperature burning damage to the surface of the protective cover and extending the service life of the protective cover 16. During the contact between the flue gas and the absorption layer 162, the water absorbed by the absorption layer 162 absorbs heat and evaporates, thereby cooling the flue gas. In addition, particulate impurities in the flue gas are captured and absorbed by the water in the absorption layer 162 when they contact the absorption layer 162.

[0068] Furthermore, because the guide groove 164 is in communication with the lower area of ​​the absorption hole 161, the suction effect of the absorption hole 161 causes a negative pressure to be formed inside the guide groove 164, causing part of the flue gas that contacts the absorption layer 162 to penetrate through the absorption layer 162 and enter the guide groove 164, and mix with the water flowing in the guide groove 164. The flue gas that penetrates the absorption layer 162 is fully in contact with the water in the absorption layer 162, separating particulate impurities in the flue gas and increasing the water content of the flue gas, which is beneficial for pre-treatment of the flue gas and reduces the workload of subsequent flue gas purification.

[0069] As the water flows into the guide groove 164, it penetrates from top to bottom, so that the pollutants such as particulate impurities captured in the absorption layer 162 fall to the bottom of the treatment tank 11 along with the squeezed water flow, enter the quenching liquid circulation system, and are separated and recovered in the filtration and purification module therein, so that the absorption layer 162 has a self-purification function and can continue to work.

[0070] Embodiment 5:

[0071] Based on the fourth embodiment, a guide pipe 165 is provided inside the guide groove 164. The diameter of the guide pipe 165 is smaller than the cross-sectional area of ​​the guide groove 164. One end of the guide pipe 165 extends to the lower side of the absorption hole 161 and is inclined downward to the surface of the block 141.

[0072] The outer surface of the guide tube 165 is evenly provided with collecting holes 166, which are communicated with the interior of the guide groove 164. The surface of the absorption layer 162 is evenly provided with air holes 167, and the positions of the air holes 167 and the positions of the collecting holes 166 are staggered.

[0073] Specific workflow: Based on the specific workflow of Example 4, one end of the guide tube 165 is close to the lower side of the absorption hole 161. Due to the negative pressure generated by the exhaust, the air flow inside the guide tube 165 tends to flow toward the end near the absorption hole 161. Under the action of the pressure difference, the water flow and flue gas in the internal area of ​​the guide groove 164 enter the interior of the guide tube 165 through the collection hole 166 and flow along the stable path formed in the internal area of ​​the guide tube toward the absorption hole 161. The flue gas and water flow mix in the narrow area inside the guide tube 165 to form a gas-liquid mixture, which is fully mixed and contacted, thereby performing cooling and dust removal pretreatment on the flue gas.

[0074] When the end of the guide pipe 165 tilts downward and flows out, the water flow inside flows downward under the action of gravity, and the flue gas mixed in it is separated from the water flow and sucked into the absorption hole 161, thereby fully recovering the flue gas; the water flow flowing downward along the surface of the block 141 then flows into the surface of the forging on the lower side, flows vertically downward, and collides with the upward-flowing protective gas to form a gas-liquid mixture, which acts on the surface of the forging, thereby better stripping off the oxide scale, particulate impurities, etc. adhering to the forging surface;

[0075] The vents 167 provided on the absorption layer 162 draw upward-flowing flue gas into the gap area under the action of pressure difference. The collection holes 166 are staggered from the vents 167, which encourages the incoming flue gas to flow along the gap area and fully contact with the moisture in the gap area, thereby achieving cooling and dust removal of the flue gas.

[0076] The uniform distribution of the collecting holes 166 on the guide pipe 165 makes the negative pressure impact more evenly distributed to various areas of the guide groove 164, so that the flue gas on the lower side of the protective cover 16 is attracted more evenly, and penetrates upward into the absorption layer 162, so that the flue gas is in full contact with the absorption layer 162. The flue gas combines with the moisture in the absorption layer 162, and absorbs and separates the particulate impurities in the flue gas for pre-treatment, thereby improving the purification efficiency of the flue gas and reducing the burning erosion of the flue gas on the inner wall of the recovery pipe and other related equipment pipelines.

[0077] Example 6:

[0078] On the basis of the fifth embodiment, the lower surface of the protective cover 16 has an inclined structure, and the portion of the lower surface of the protective cover 16 close to the absorption hole 161 is lower than the portion away from the absorption hole 161. The expansion portion 168 is evenly provided on the guide tube 165. The cross-section of the expansion portion 168 is larger than the cross-sectional area of ​​other portions. The sidewall of the expansion portion 168 is made of an elastic airbag material, and the other portions are made of a rigid hard plastic material with greater rigidity. In this way, the evenly distributed expansion portions 168 divide the guide tube 165 into multiple sections, which are elastically connected to each other.

[0079] Specific workflow: Based on the specific workflow in Example 5, when the intercepted water flow contacts the lower surface of the protective cover 16, the inclined surface structure enables the water flow to flow out along the inclined surface in a direction close to the absorption hole 161, thereby promoting more water flow to enter the absorption layer 162 and participate in the pretreatment of the flue gas, thereby improving the utilization rate of the water flow;

[0080] Furthermore, the surface of the expansion portion 168 provided on the guide tube 165 presses against the inner wall of the guide groove 164 and the inner wall of the absorption layer 162, thereby supporting the gap between the guide groove 164 and the absorption layer 162. As the absorption hole 161 starts to pump air, a negative pressure is formed inside the guide tube 165, causing the elastic expansion portion 168 to deform and shrink due to the negative pressure, thereby reducing its volume. At this time, the support effect on the absorption layer 162 is reduced, and the absorption layer 162 is moved closer to the lower surface of the protective cover 16 under the action of the negative pressure. At this time, the gap area between the absorption layer 162 and the protective cover 16 is also reduced. When the absorption hole 161 stops pumping air, the expansion portion 168 elastically recovers and again expands the gap between the absorption layer 162 and the protective cover 16, thereby increasing the gap area. The changes in space and pressure difference brought about by the increase and decrease of the gap area enhance the airflow exchange between the inside of the gap area and the outside, thereby promoting the smoke to enter the gap area and fully contact with the moisture therein.

[0081] The change in air pressure causes the expansion portion 168 to deform, thereby causing the different sections of the guide tube 165 on both sides of the expansion portion 168 to vibrate, prompting the absorption layer 162 to accelerate the expulsion of water mixed with particulate impurities due to the vibration. To this end, the exhaust gas recovery equipment corresponding to the absorption hole 161 can be set to start the air extraction function intermittently, or a micro vibration motor can be directly installed outside the expansion portion 168 to cause the expansion portion 168 to deform and vibrate through vibration.

[0082] This vibration deformation of the absorption layer 162 causes the spatial change of the gap area, while also putting pressure on the loose and porous absorption layer 162, which repeatedly discharges water and particulate impurities downward and then absorbs water flowing in from the guide groove 164, thereby achieving self-purification inside the absorption layer 162 and improving the utilization efficiency of the absorption layer 162.

[0083] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A local precipitation hardening treatment device for nickel-based alloy forging, comprising a local heat treatment body (1), the local heat treatment body (1) comprising a PLC control center and a treatment tank (11), a quenching liquid circulation system being provided at the bottom of the treatment tank (11), and characterized in that: An L-shaped mounting platform (12) is provided inside the processing tank (11), and a vertical portion of the mounting platform (12) is connected to the inner wall of the processing tank (11) via a vertical transmission mechanism; A positioning seat (13) is provided at the bottom of the mounting platform (12), a positioning block (131) is provided at the top of the positioning seat (13), a clamping slot (132) is provided at the top of the positioning block (131), a limiting seat (14) is provided on the mounting platform (12) at a position above the clamping slot (132), and the limiting seat (14) limits the forging by cooperating with the clamping slot (132) through the clamping block (141) at the bottom; An induction coil (15) is provided on the side wall of the processing tank (11) around the positioning seat (13), a water cooling channel (151) is provided inside the induction coil (15), and a quenching spray hole (152) is provided on the induction coil (15); A protective cover (16) is provided on the limiting seat (14), and an absorption hole (161) is provided on the inner wall of the protective cover (16), and the absorption hole (161) is communicated with the external purification equipment; The induction coil (15) forms a multi-circle structure around the positioning seat (13), and the quenching nozzle (152) is located on the inner circle surface of the innermost circle of the induction coil (15), and the opening is directed toward the central positioning seat (13); The upper surface of the outermost ring induction coil (15) is provided with a purification spray hole (153), the purification spray hole (153) is distributed in an annular shape around the positioning seat (13), and the purification spray hole (153) points to the protective cover (16); An absorption layer (162) is evenly laid on the inner wall surface of the protective cover (16), the absorption layer (162) is made of a loose porous material, and the edge of the absorption layer (162) extends to the edge of the lower surface of the protective cover (16); An interception ring (163) is provided at the edge of the protective cover (16), and the outer edge of the interception ring (163) is vertically protruded downward; A guide groove (164) is provided on the lower surface of the interception ring (163), and an end of the guide groove (164) extends through the gap area between the protective cover (16) and the absorption layer (162) and is close to the lower side of the absorption hole (161).

2. The local precipitation hardening treatment device for nickel-based alloy forging according to claim 1, characterized in that: A protective air hole (133) is provided on the top of the positioning seat (13), the protective air hole (133) is communicated with the protective gas supply system, and the protective air holes (133) are distributed in an annular shape around the card slot (132), and the top opening of the protective air hole (133) points to the absorption hole (161).

3. The local precipitation hardening treatment device for nickel-based alloy forging according to claim 1, characterized in that: A guide pipe (165) is provided inside the guide groove (164); the diameter of the guide pipe (165) is smaller than the cross-sectional area of ​​the guide groove (164); and the end opening of the guide pipe (165) extends to the lower side of the absorption hole (161) and is inclined downwardly toward the surface of the block (141); The outer surface of the flow guide tube (165) is evenly provided with collecting holes (166), and the surface of the absorption layer (162) is evenly provided with ventilation holes (167), and the positions of the ventilation holes (167) and the positions of the collecting holes (166) are staggered.

4. The local precipitation hardening treatment device for nickel-based alloy forging according to claim 3, characterized in that: The lower surface of the protective cover (16) is a sloped structure, and a portion of the lower surface of the protective cover (16) close to the absorption hole (161) is lower than a portion away from the absorption hole (161).

5. The local precipitation hardening treatment device for nickel-based alloy forging according to claim 4, characterized in that: The expansion portion (168) is evenly arranged on the guide tube (165), the cross section of the expansion portion (168) is larger than the cross section area of ​​other parts of the guide tube (165), and the side wall of the expansion portion (168) is made of elastic material.

6. The local precipitation hardening treatment device for nickel-based alloy forging according to claim 1, characterized in that: The middle portion of the card slot (132) bulges upward to form an arc-shaped bulge structure, and debris removal holes (134) are evenly arranged on the inner wall of the card slot (132). The debris removal holes (134) are located at the bottom of the inner edge area of ​​the card slot (132).

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