A casting apparatus for a turbocharger volute

Abstract

The application relates to the field of turbocharger casting technology, in particular to a casting device for a turbocharger volute; the device comprises a machine body, an installation frame is arranged at the upper end of the machine body, and electric guide rails are fixedly arranged on the two sides of the machine body; the device is provided with an annular air bag; after the support plate drives the annular air bag to be inserted into the forming groove of the sand core of the volute, the gas in the corrugated air bag under extrusion is transported to the annular air bag, so that the annular air bag is stretched; at this time, the stretched annular air bag can be tightly filled into the forming groove of the sand core of the volute and tightly abut against the forming groove; therefore, the support plate can be steadily pulled to make the sand core of the volute rise by the static friction force generated between the annular air bag and the inner wall of the volute; compared with the traditional similar gripper grabbing device, the contact area of the annular air bag and the inner wall of the forming groove is larger; the problem that cracks appear in the sand core due to the fact that the local forming groove of the sand core bears too large pressure is avoided; and the safety of the sand core is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of turbocharger casting technology, in particular to a kind of casting device of turbocharger volute. BACKGROUND

[0002] Turbocharger is a kind of equipment for improving engine intake pressure by using exhaust energy to improve the power of engine;In the whole turbocharger construction system, volute occupies a pivotal position, is a very key component;The main function of volute is to collect high-temperature, high-pressure exhaust gas discharged from engine, and guide these exhaust gas to turbine in a specific way, to ensure that exhaust gas can efficiently drive turbine operation, therefore, it is subjected to high temperature, high pressure and high-speed airflow scouring test, in addition, the forming method of turbine shell is crucial to the performance and reliability of turbocharger, if there are defects in the forming process of volute, such as internal micro cracks, blowhole, etc., in the long-term working environment of high temperature, high pressure and high-speed airflow scouring, these defects may gradually expand and deteriorate, eventually leading to volute damage, affecting the reliability and service life of turbocharger;

[0003] Sand mold casting is the most common forming method of existing turbocharger volute;Specific method is to manufacture the required sand core by hot core production and cold core production method, then use molding machine to make upper sand mold and lower sand mold, before the upper sand mold and lower sand mold are combined, the user needs to put sand core;That is, put sand core into sand mold, after the upper sand mold and lower sand mold are combined, melt the metal into the pre-made sand mold, then wait for the metal to solidify, take out the cast volute for post-processing, and then the final volute product is obtained;Sand mold casting method has low cost and is suitable for mass production of volute;

[0004] In the process of existing turbocharger volute sand core casting, similar gripper grabbing device is often used to grab and transport sand core;Since similar gripper grabbing device only clamps part of sand core, the part of sand core clamped bears larger local pressure, forming stress concentration area;Especially during the transportation process, the inertia force and other external force generated by acceleration, deceleration and turning actions can further increase the stress of these stress concentration areas;As a kind of relatively brittle material, sand core is prone to crack at these parts when the stress concentration exceeds the tensile strength of its material;

[0005] Therefore, in order to overcome the above technical problems, the present application provides a kind of casting device of turbocharger volute, which solves the above technical problems. SUMMARY

[0006] In order to make up for the deficiency of the prior art, the application provides a casting device for a turbocharger volute, wherein an annular air bag is arranged, after the support plate drives the annular air bag to be inserted into the forming groove of the sand core of the volute, the gas in the squeezed corrugated air bag is transported to the annular air bag, so that the annular air bag is stretched, at this time, the stretched annular air bag can be tightly filled into the forming groove of the sand core of the volute and tightly abut against the forming groove, so that the support plate is steadily pulled up along with the static friction force generated between the annular air bag and the inner wall of the volute, compared with the traditional similar gripper grabbing device, the contact area of the annular air bag and the inner wall of the forming groove is larger, the problem that the sand core is cracked due to the local excessive pressure of the sand core forming groove is avoided, and the safety of the sand core is improved.

[0007] The application solves the technical problems by the technical scheme that the casting device for the turbocharger volute comprises:

[0008] A machine body is provided with a mounting frame at the upper end, and electric guide rails are fixedly installed on both sides of the machine body and connected with the mounting frame;

[0009] A mounting plate is slidably connected with the mounting frame, and the mounting plate and the mounting frame are connected through a hydraulic push rod; a lower core plate is arranged below the mounting plate, and the lower core plate is located at the end of the mounting plate away from the hydraulic push rod; the lower core plate is connected with the mounting plate through an electric push rod;

[0010] A support plate is slidably connected in a strip-shaped groove at the lower end of the lower core plate; an annular air bag is installed on the surface of the support plate; a screw rod is rotatably connected in the strip-shaped groove; a driving motor is installed at the upper end of the lower core plate; a bevel gear shaft is fixedly connected to the end of the screw rod close to the driving motor; and a bevel gear ring engaged with the bevel gear shaft is fixedly connected to the output end of the driving motor;

[0011] A gas supply unit is installed at the upper end of the mounting plate and used for inflating and deflating the annular air bag.

[0012] Preferably, the gas supply unit comprises a corrugated air bag, the corrugated air bag is sleeved on the surface of the hydraulic push rod, a gas hole is formed in the mounting plate, one end of the gas hole is in communication with the corrugated air bag, and the other end is in communication with the annular air bag through a spring hose.

[0013] Preferably, an air exchange groove in communication with the outside is formed in the mounting plate, the air exchange groove is in communication with the gas hole, a sealing plate is slidably and sealingly connected in the air exchange groove, the sealing plate and the groove wall of the air exchange groove are connected through a sealing spring, an electromagnetic plate is inlaid in the groove wall of the air exchange groove, and a through groove is formed in the surface of the sealing plate.

[0014] Preferably, the outer surface of the annular air bag is fixed with protrusions; the protrusions are made of silica gel material; the protrusions are arranged in triangular shape.

[0015] Preferably, the support plate is rotatably connected with a connecting block at one end away from the strip-shaped groove through a torsion spring; the annular air bag is connected with the connecting block; a cavity is formed in the support plate; a driving gear is rotatably connected in the cavity; the driving gear is screw transmission connected with the lead screw; a spur gear shaft meshing with the driving gear is rotatably connected in the cavity; the spur gear shaft and the connecting block are connected through a steel wire rope; a clamping unit is installed in the support plate; the clamping unit is used for clamping the driving gear.

[0016] Preferably, the clamping unit comprises a clamping rod; a slot is formed in the side wall of the cavity; the clamping rod is slidingly connected in the slot; the clamping rod and the slot bottom are fixed through a supporting spring; a clamping groove is formed in one side of the driving gear close to the slot; the slot bottom is inlaid with an electromagnetic sheet.

[0017] Preferably, a groove is formed in one end of the connecting block away from the support plate; a blocking block is rotatably connected in the groove mouth through a torsion spring; a clasp is fixed on the inner ring wall of the annular air bag.

[0018] Preferably, a pressure sensor is inlaid in the side wall of the connecting block; the pressure sensor is located between the connecting block and the annular air bag.

[0019] The beneficial effects of the present application are as follows:

[0020] 1. By arranging the annular air bag, after the support plate drives the annular air bag to insert into the forming groove of the sand core of the volute, the gas in the corrugated air bag under extrusion is transported to the annular air bag, so that the annular air bag is stretched; at this time, the stretched annular air bag can be tightly filled into the forming groove of the sand core of the volute and tightly abut against the forming groove; so that the support plate is smoothly pulled up by the static friction force generated between the annular air bag and the inner wall of the volute; compared with the traditional similar gripper grabbing device; the contact area of the annular air bag and the inner wall of the forming groove is larger; the problem that the sand core forming groove locally bears excessive pressure and causes cracks in the sand core is avoided; and the safety of the sand core is improved.

[0021] 2. By arranging the connecting block, the annular air bag is fixed on the inner wall of the connecting block; when not in use, the annular air bag is surrounded by three connecting blocks; so that the connecting block can protect the annular air bag, prevent the annular air bag from colliding with external workpieces and other equipment, and avoid scratches on the surface of the annular air bag, thereby prolonging the service life of the annular air bag. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in conjunction with the drawings and embodiments.

[0023] Figure 1 is a perspective view of the present application;

[0024] Figure 2 is a partial sectional view of the mounting plate used in the present application;

[0025] Figure 3 is Figure 2 is an enlarged view of A in FIG. 1;

[0026] Figure 4 is Figure 2 is an enlarged view of B in FIG. 1;

[0027] Figure 5 is a partial sectional view of the lower core plate used in the present application;

[0028] Figure 6 is Figure 5 is an enlarged view of C in FIG. 1;

[0029] Figure 7 is Figure 5 is an enlarged view of D in FIG. 1;

[0030] Figure 8 is Figure 5 is an enlarged view of E in FIG. 1;

[0031] In the figure: 1, body; 11, mounting frame; 111, electric guide rail; 12, mounting plate; 121, hydraulic push rod; 122, air hole; 123, spring hose; 13, electric push rod; 14, corrugated air bag; 15, air exchange groove; 16, sealing plate; 161, sealing spring; 162, electromagnetic plate; 163, through groove; 2, lower core plate; 21, support plate; 22, strip-shaped groove; 221, screw rod; 222, bevel gear shaft; 23, ring-shaped air bag; 231, protrusion; 24, driving motor; 241, bevel gear ring; 242, clamping ring; 25, connecting block; 26, cavity; 261, driving gear; 262, spur gear shaft; 263, steel wire rope; 264, clamping groove; 265, clamping rod; 27, insertion groove; 271, support spring; 272, electromagnetic sheet; 28, recess; 281, blocking block; 282, pressure sensor. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0033] As Figures 1 to 8As shown in the turbine supercharger volute casting device, the body 1 is provided with a mounting frame 11 at the upper end; the body 1 is fixedly provided with an electric guide rail 111 on both sides; the electric guide rail 111 is connected with the mounting frame 11; the mounting plate 12 is slidably connected with the mounting frame 11; the mounting plate 12 is connected with the mounting frame 11 through a hydraulic push rod 121; a lower core plate 2 is arranged below the mounting plate 12; the lower core plate 2 is located at the end of the mounting plate 12 away from the hydraulic push rod 121; the lower core plate 2 is connected with the mounting plate 12 through an electric push rod 13; a strip-shaped groove 22 is formed in the lower end of the lower core plate 2; the support plate 21 is slidably connected in the strip-shaped groove 22; the surface of the support plate 21 is provided with an annular air bag 23; a lead screw 221 is rotatably connected in the strip-shaped groove 22; a drive motor 24 is arranged at the upper end of the lower core plate 2; a bevel gear shaft 222 is fixedly connected at the end of the lead screw 221 close to the drive motor 24; a bevel gear ring 241 engaged with the bevel gear shaft 222 is fixedly connected to the output end of the drive motor 24; the upper end of the mounting plate 12 is provided with a gas supply unit; the gas supply unit is used for inflating and deflating the annular air bag 23.

[0034] As an embodiment of the application, the gas supply unit comprises a corrugated air bag 14; the corrugated air bag 14 is sleeved on the surface of the hydraulic push rod 121; a gas hole 122 is formed in the mounting plate 12; one end of the gas hole 122 is communicated with the corrugated air bag 14, and the other end is communicated with the annular air bag 23 through a spring hose 123.

[0035] As an embodiment of the application, a gas exchange groove 15 communicating with the outside is formed in the mounting plate 12; the gas exchange groove 15 is communicated with the gas hole 122; a sealing plate 16 is slidably and sealingly connected in the gas exchange groove 15; the sealing plate 16 is connected with the groove wall of the gas exchange groove 15 through a sealing spring 161; the groove wall of the gas exchange groove 15 is inlaid with an electromagnetic plate 162; a through groove 163 is formed in the surface of the sealing plate 16.

[0036] As an embodiment of the application, the outer surface of the annular air bag 23 is fixedly connected with a protrusion 231; the protrusion 231 is made of silica gel material; the protrusion 231 is triangular.

[0037] In operation, the volute often bears a large pressure and complex mechanical action in operation, so a boss is arranged on one side of the volute, so that the local boss can enhance the overall structural strength and rigidity of the volute, in addition, the boss can be used as a connection point of the internal or external support structure, cooperates with other support components to prevent the volute from deforming under the action of its own weight, medium pressure and external environment, and ensures the shape accuracy and working performance of the volute, so a forming groove for forming the boss is arranged on one side of the sand core of the cast volute.

[0038] In the existing turbine supercharger volute sand mold casting core dropping process, a similar claw grabbing device is usually used to grab and carry the sand core. Since the similar claw grabbing device only clamps the sand core locally, the part of the sand core clamped bears a larger local pressure, forming a stress concentration area. Especially during the carrying process, the inertia force and other external forces generated by acceleration, deceleration and turning actions further increase the stress of the stress concentration area. As a relatively brittle material, the sand core is prone to cracks at these parts when the stress concentration exceeds the tensile strength of the material.

[0039] To solve the above problems, the present application sets an annular air bag 23. After the support plate 21 drives the annular air bag 23 to insert into the forming groove of the sand core of the volute, the gas in the squeezed corrugated air bag 14 is transported to the annular air bag 23, so that the annular air bag 23 expands. At this time, the expanded annular air bag 23 can tightly fill into the forming groove of the sand core of the volute and tightly abut against the forming groove, so that the support plate 21 smoothly pulls the sand core of the volute upward by the static friction force generated between the annular air bag 23 and the inner wall of the volute. Compared with the traditional similar claw grabbing device, the contact area of the annular air bag 23 and the inner wall of the forming groove is larger, avoiding the problem of cracks in the sand core forming groove caused by excessive local pressure on the sand core, thereby improving the safety of the sand core placement.

[0040] In the initial state, the hydraulic push rod 121 is in the elongated state, the side of the machine body 1 away from the molding machine is connected with the conveying belt outside for conveying the volute sand core, and the inner wall of the machine body 1 is coated with a PTFE coating. After the conveying belt outside conveys the volute sand core to the machine body 1, at this time the forming groove of the volute sand core faces upward, the user controls the electric guide rail 111 to drive the mounting frame 11 to move toward the volute sand core, so that the mounting frame 11 drives the support plate 21 to the upper side of the volute sand core through the mounting plate 12. Then the electric push rod 13 is controlled to elongate, so that the electric push rod 13 drives the lower core plate 2 to descend, the lower core plate 2 drives the support plate 21 to descend, and the support plate 21 drives the annular air bag 23 connected thereto to descend synchronously under the pushing of the support plate 21, until the annular air bag 23 enters the forming groove of the volute sand core under the pushing of the support plate 21. Then the driving motor 24 is controlled to operate, so that the driving motor 24 can drive the bevel gear ring 241 fixed to the output shaft to rotate, the bevel gear ring 241 drives the bevel gear shaft 222 engaged therewith to rotate, the bevel gear shaft 222 drives the lead screw 221 fixed thereto to rotate synchronously, the lead screw 221 drives the support plate 21 to slide along the strip-shaped groove 22 in a spiral manner, and the support plate 21 pushes the annular air bag 23 to approach the inner wall of the forming groove of the volute sand core.

[0041] Since the annular air bag 23 is in an uninflated state at this time, when the support plate 21 pushes the annular air bag 23 into contact with the inner wall of the forming groove of the volute sand core, the annular air bag 23 cannot effectively support the inner wall of the forming groove, at which time the user needs to control the hydraulic push rod 121 to retract, so that the hydraulic push rod 121 pulls the mounting plate 12 to move away from the conveying belt, so that the mounting plate 12 pushes the volute sand core to slide in the machine body 1 through the lower core plate 2 and the support plate 21. Since the inner wall of the machine body 1 is sprayed with a PTFE coating, the friction between the smooth volute sand core and the inner wall of the machine body 1 is small, so as to avoid the volute sand core being abraded by the inner wall of the machine body 1.

[0042] When the hydraulic push rod 121 pulls the mounting plate 12 away from one end of the lower core plate 2 to continuously approach the mounting frame 11, the mounting plate 12 continuously extrudes the corrugated air bag 14 under the action of the hydraulic push rod 121, so that the gas in the corrugated air bag 14 is extruded into the air hole 122 connected thereto, so that the gas entering the air hole 122 can enter the air exchange groove 15. Since in the initial state, the sealing plate 16 in the air exchange groove 15 is located below the air exchange groove 15 under the action of the sealing spring 161, at this time the sealing plate 16 in the air exchange groove 15 blocks the air hole 122 connected by the spring hose 123, and the air exchange groove 15 is still in an open state. The air exchange groove 15 communicates with the outside, that is, during the process of the gas in the corrugated air bag 14 entering the air exchange groove 15, the gas entering the air exchange groove 15 will flow out through the air exchange groove 15 and the outside communication port.

[0043] Therefore, by arranging the electromagnetic plate 162, the user continuously increases the power of the electromagnetic plate 162, so that the electromagnetic plate 162 generates a magnetic force, and the magnetic force continuously increases, so that the magnetic adsorption force generated by the electromagnetic plate 162 on the sealing plate 16 continuously increases, until the magnetic adsorption force of the sealing plate 16 absorbed by the electromagnetic plate 162 is greater than its weight and the pushing force of the sealing spring 161. The sealing plate 16 absorbed by the electromagnetic plate 162 extrudes the sealing spring 161 to rise, so that the rising sealing plate 16 blocks the communication port of the air exchange groove 15 with the outside, at which time the air hole 122 connected by the spring hose 123 of the air exchange groove 15 is opened, at which time the gas in the corrugated tube enters the air exchange groove 15, and flows into the air hole 122 connected with the spring hose 123 through the through groove 163 on the surface of the sealing plate 16, and finally flows into the annular air bag 23 from the spring hose 123.

[0044] When the inflation of the annular air bag 23 is completed, the control electromagnetic plate 162 is powered off, at this time, the sealing plate 16 is pushed down by the restoring force of the sealing spring 161 and blocks the air hole 122 communicating with the spring hose 123 again, so that the gas in the annular air bag 23 no longer flows out from the spring hose 123. In the process that the gas in the air exchange groove 15 is transported to the annular air bag 23 through the spring hose 123, the annular air bag 23 is constantly stretched, so that the stretched annular air bag 23 is constantly filled into the forming groove of the sand core of the volute, and the annular air bag 23 tightly abuts against the forming groove. The close abutment can form a stable contact state, so that the contact area of the annular air bag 23 and the inner wall of the volute is increased, thereby a sufficient static friction force can be generated, so as to ensure that the support plate 21 can stably pull up the sand core of the volute through the annular air bag 23 and accurately place it to the predetermined position, and the core lowering operation is completed.

[0045] In addition, in order to increase the static friction force between the annular air bag 23 and the inner wall of the volute, the protrusion 231 is fixed to the outer wall of the annular air bag 23, so that the protrusion 231 can increase the roughness of the surface of the annular air bag 23, thereby further increasing the static friction force between the annular air bag 23 and the inner wall of the volute. The protrusion 231 is triangular, because in actual use, the design of the triangular protrusion 231 can provide better anti-skid effect. Since the triangle has sharp corners and inclined sides, when the annular air bag 23 contacts the forming groove wall through the triangular protrusion 231, the corners and sides of the triangular protrusion 231 can form multiple contact points, which can generate larger pressure on smaller area, thereby generating greater friction force. Moreover, the stability principle of the triangle makes the protrusion 231 not easy to deform under stress, and can continuously maintain good friction performance. The structure of the triangle makes the stress dispersed to each corner and side when the protrusion 231 is stressed, thereby reducing the possibility of local wear and tear, and further improving the service life of the protrusion 231.

[0046] As an embodiment of the present application, one end of the support plate 21 away from the strip-shaped groove 22 is rotatably connected with a connecting block 25 through a torsion spring; the annular air bag 23 is connected with the connecting block 25; a cavity 26 is formed in the support plate 21; a drive gear 261 is rotatably connected in the cavity 26; the drive gear 261 is screw transmission connected with the lead screw 221; a spur gear shaft 262 engaged with the drive gear 261 is rotatably connected in the cavity 26; the connecting block 25 and the spur gear shaft 262 are connected through a steel wire rope 263; a clamping unit is installed in the support plate 21; the clamping unit is used for clamping the drive gear 261.

[0047] As one of the embodiments of the present application, the clamping unit comprises a clamping rod 265; the side wall of the cavity 26 is provided with a slot 27; the clamping rod 265 is slidingly connected in the slot 27; the clamping rod 265 and the bottom of the slot 27 are fixedly connected through a supporting spring 271; the side of the driving gear 261 close to the slot 27 is provided with a clamping groove 264; the bottom of the slot 27 is inlaid with an electromagnetic sheet 272.

[0048] As one of the embodiments of the present application, the connecting block 25 is provided with a groove 28 at the end away from the supporting plate 21; the groove 28 is rotatably connected with a blocking block 281 through a torsion spring; the inner ring wall of the annular air bag 23 is fixedly connected with a clasp 242.

[0049] As one of the embodiments of the present application, the side wall of the connecting block 25 is inlaid with a pressure sensor 282; the pressure sensor 282 is located between the connecting block 25 and the annular air bag 23.

[0050] In operation, in the industrial production environment, there are various objects and tools around the equipment during operation; if the annular air bag 23 is located on the outer wall of the supporting plate 21, the annular air bag 23 is easy to collide with the surrounding equipment and workpieces during the movement of the supporting plate 21 driving the annular air bag 23; which results in the surface of the annular air bag 23 being scratched and worn, reducing its service life, and even possibly making the air bag unable to work normally after a serious collision.

[0051] To this end, the present application sets the connecting block 25, so that the annular air bag 23 is fixedly connected to the inner wall of the connecting block 25; when not in use, the annular air bag 23 is surrounded by three connecting blocks 25; so that the connecting block 25 can protect the annular air bag 23, prevent the annular air bag 23 from colliding with the external workpieces and equipment, and further avoid the problem of scratches on the surface of the annular air bag 23, thereby improving the service life of the annular air bag 23.

[0052] In the initial state, the supporting plate 21 is in screw transmission connection with the lead screw 221 through the driving gear 261, and the clamping rod 265 is located in the clamping groove 264 of the side wall of the driving gear 261. When it is needed to support the inner wall of the volute core forming groove by the annular air bag 23, the electromagnetic sheet 272 is controlled to be electrified, so that the electromagnetic sheet 272 generates a magnetic attraction force on the clamping rod 265, so that the clamping rod 265 can extrude the supporting spring 271, so that the clamping rod 265 extruding the supporting spring 271 extends out of the clamping groove 264 and enters the insertion slot 27, so that the clamping rod 265 entering the insertion slot 27 no longer blocks the driving gear 261 through the groove wall of the clamping groove 264. At this time, the driving motor 24 is controlled to operate, so that the driving motor 24 can drive the driving gear 261 to rotate through the lead screw 221, so that the driving gear 261 can rotate in the cavity 26, so that the driving gear 261 in the cavity 26 can drive the spur gear shaft 262 meshing therewith to rotate. Since one end of the steel wire rope 263 away from the connecting block 25 is fixedly connected with the wheel shaft of the spur gear shaft 262, the spur gear shaft 262 can drive one end of the steel wire rope 263 to wind around the wheel shaft during rotation, so that the end of the steel wire rope 263 connected with the connecting block 25 can pull the connecting block 25 to rotate upwardly against the torsional force of the torsional spring.

[0053] Since the connecting block 25 is provided with three, the side of the three connecting blocks 25 close to each other will rotate away from the supporting plate 21 with the overturning of the connecting block 25. Since the connecting block 25 drives the annular air bag 23 to overturn synchronously, until the overturned connecting block 25 contacts the supporting plate 21, the annular air bag 23 located on the side of the connecting block 25 close to each other can be overturned to the outer circle of the supporting plate 21 under the driving of the connecting block 25, so as to ensure that the subsequent annular air bag 23 can effectively contact the inner wall of the forming groove. Then, after the connecting block 25 contacts the supporting plate 21, the electromagnetic sheet 272 is controlled to be de-energized, so that the clamping rod 265 moves to the direction close to the clamping groove 264 under the pushing of the restoring force of the supporting spring 271, so that the clamping rod 265 extends out of the insertion slot 27 and enters the clamping groove 264 under the pushing of the supporting spring 271, so that the clamping rod 265 fixes the driving gear 261 in the cavity 26 through the clamping groove 264 of the driving gear 261, so that the driving gear 261 is fixedly connected with the supporting plate 21 through the clamping rod 265. Then, the driving motor 24 is continuously controlled to operate, so that the driving motor 24 can drive the supporting plate 21 to slide along the strip-shaped groove 22 through the driving gear 261, so that the supporting plate 21 can drive the annular air bag 23 to contact the inner wall of the forming groove through the connecting block 25. In the subsequent inflation process, the annular air bag 23 can be tightly attached to the groove wall of the forming groove.

[0054] Due to different models of turbochargers, the size of the volute of the turbocharger used is also different, so the size of the sand core required for casting is also different for different models of the volute, and for a large sand core, the diameter of the forming groove is also large, so in order to ensure that the annular air bag 23 can be closely fitted with the inner wall of the sand core forming groove, the diameter of the annular air bag 23 needs to be replaced, and for this purpose, the present application is provided with a recess 28 at one end of the connecting block 25 away from the support plate 21, so that the annular air bag 23 can be clamped in the recess 28 of the connecting block 25 through the inner ring wall of the buckle 242, thereby facilitating the user to quickly replace the annular air bag 23 of different sizes, not only saving the replacement efficiency of the annular air bag 23, but also improving the efficiency of the sand core, and also enabling the present application to effectively lower the sand core of different sizes, thereby effectively improving the practicality of the present application.

[0055] In the initial state, the buckle 242 of the annular air bag 23 is woven from nylon fiber, so that the buckle 242 has good elasticity, heat resistance, wear resistance and corrosion resistance. During replacement of the annular air bag 23, the user needs to first push the buckle 242 up. Since the buckle 242 is made of nylon fiber material, the pushed buckle 242 is deformed by wrinkling, so that the buckle 242 enters the recess 28, so that the buckle 242 entering the recess 28 does not block the blocking block 281. Then press the blocking block 281 so that the blocking block 281 overcomes the torsional force of the torsional spring and rotates upward, so that the slot of the recess 28 is no longer blocked by the blocking block 281. At this time, the user can pull the annular air bag 23 to expose the buckle 242 from the slot of the recess 28, and then insert the buckle 242 of the new annular air bag 23 into the slot of the recess 28, and then release the blocking block 281. The blocking block 281 is reset under the action of the torsional force of the torsional spring, so that the blocking block 281 blocks the slot of the recess 28 again, so that the annular air bag 23 can be fixed in the recess 28 of the connecting block 25 through the buckle 242, and the annular air bag 23 is movably connected with the connecting block 25.

[0056] The pressure sensor 282 is provided when the connecting block 25 extrudes the annular air bag 23 to contact the forming groove wall. As known from the force interaction, the extrusion force of the annular air bag 23 on the forming groove wall of the sand core is the same as the extrusion force of the annular air bag 23 on the side wall of the connecting block 25. Therefore, by embedding the pressure sensor 282 in the side wall of the connecting block 25, the extrusion force of the annular air bag 23 on the pressure sensor 282 is the same as the extrusion force of the annular air bag 23 on the forming groove wall of the sand core. Therefore, the user can detect the extrusion force of the annular air bag 23 on the forming groove wall of the sand core through the pressure signal transmitted by the pressure sensor 282, so as to avoid the problem that the extrusion force of the annular air bag 23 on the forming groove wall of the sand core is too large, which causes the sand core to be damaged by cracks. Thus, the practicality of the present application is effectively improved.

[0057] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations and modifications are intended to be included within the scope of the application as defined in the following claims and the equivalents thereof.

Claims

1. A turbocharger volute casting device, comprising: a body (1), the upper end of the body (1) is provided with a mounting frame (11); the body (1) is fixedly installed with electric guide rails (111) on both sides; the electric guide rails (111) are connected with the mounting frame (11), characterized in that: a mounting plate (12) is slidably connected with the mounting frame (11); the mounting plate (12) and the mounting frame (11) are connected through a hydraulic push rod (121); a lower core plate (2) is arranged below the mounting plate (12); the lower core plate (2) is located at the end of the mounting plate (12) away from the hydraulic push rod (121); the lower core plate (2) is connected with the mounting plate (12) through an electric push rod (13); a support plate (21), a strip-shaped groove (22) is formed in the lower end of the lower core plate (2); the support plate (21) is slidably connected in the strip-shaped groove (22); an annular air bag (23) is mounted on the surface of the support plate (21); a lead screw (221) is rotatably connected in the strip-shaped groove (22); a drive motor (24) is mounted on the upper end of the lower core plate (2); a bevel gear shaft (222) is fixedly connected to one end of the lead screw (221) close to the drive motor (24); a bevel gear ring (241) meshing with the bevel gear shaft (222) is fixedly connected to the output end of the drive motor (24); a gas supply unit; the gas supply unit is mounted on the upper end of the mounting plate (12); the gas supply unit is used for inflating and deflating the annular air bag (23).

2. A casting apparatus for a turbocharger volute according to claim 1, wherein: The gas supply unit comprises a corrugated air bag (14); the corrugated air bag (14) is sleeved on the surface of the hydraulic push rod (121); a gas hole (122) is formed in the mounting plate (12); one end of the gas hole (122) is in communication with the corrugated air bag (14), and the other end is in communication with the annular air bag (23) through a spring hose (123).

3. A casting apparatus for a turbocharger volute according to claim 2, wherein: A gas exchange groove (15) in communication with the outside is formed in the mounting plate (12); the gas exchange groove (15) is in communication with the gas hole (122); a sealing plate (16) is slidably and sealingly connected in the gas exchange groove (15); the sealing plate (16) and the groove wall of the gas exchange groove (15) are connected through a sealing spring (161); the groove wall of the gas exchange groove (15) is inlaid with an electromagnetic plate (162); a through groove (163) is formed on the surface of the sealing plate (16).

4. A casting apparatus for a turbocharger volute according to claim 3, wherein: A protrusion (231) is fixedly connected to the outer surface of the annular air bag (23); the protrusion (231) is made of silica gel material; the protrusion (231) is triangular.

5. A casting apparatus for a turbocharger volute according to claim 4, wherein: The support plate (21) is connected with the connecting block (25) through the torsion spring at one end away from the strip-shaped groove (22); the annular air bag (23) is connected with the connecting block (25); the support plate (21) is internally provided with the cavity (26); the cavity (26) is rotatably connected with the driving gear (261); the driving gear (261) is screw transmission connected with the lead screw (221); the cavity (26) is rotatably connected with the spur gear shaft (262) engaged with the driving gear (261); the spur gear shaft (262) and the connecting block (25) are connected through the steel wire rope (263); the support plate (21) is internally provided with the clamping unit; the clamping unit is used for clamping the driving gear (261).

6. A casting apparatus for a turbocharger volute according to claim 5, wherein: The clamping unit comprises the clamping rod (265); the cavity (26) is provided with the insertion slot (27) on the side wall; the clamping rod (265) is slidably connected in the insertion slot (27); the clamping rod (265) and the bottom of the insertion slot (27) are fixedly connected through the supporting spring (271); one side of the driving gear (261) is provided with the clamping slot (264) close to the insertion slot (27); the bottom of the insertion slot (27) is inlaid with the electromagnetic sheet (272).

7. A casting apparatus for a turbocharger volute according to claim 6, wherein: The connecting block (25) is provided with the recess (28) at one end away from the support plate (21); the notch of the recess (28) is rotatably connected with the blocking block (281) through the torsion spring; the inner ring wall of the annular air bag (23) is fixedly connected with the buckle ring (242).

8. A casting apparatus for a turbocharger volute according to claim 7, wherein: The side wall of the connecting block (25) is inlaid with the pressure sensor (282); the pressure sensor (282) is located between the connecting block (25) and the annular air bag (23).

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