Shot blasting device for inner cavity of exhaust pipe casting

Abstract

The invention relates to the technical field of exhaust manifold inner cavity shot blasting, in particular to an exhaust pipe casting inner cavity shot blasting device which comprises a shot blasting box and an exhaust manifold casting, a filter plate is arranged in the middle of the interior of the shot blasting box, and an exhaust flange of the exhaust manifold casting is fixed to the filter plate through a clamping assembly. An inner cavity shot blasting mechanism is arranged on the top face of the interior of the shot blasting box and comprises a shot blasting machine arranged on the top face of the shot blasting box, a spray head assembly arranged at the front end of a shot blasting pipeline of the shot blasting machine and an adjusting assembly used for moving and feeding of the spray head assembly, and the spray head assembly comprises a spray head part and a plurality of supporting parts arranged at intervals. The shot blasting machine has the beneficial effects that shot blasting treatment can be automatically conducted on the complex inner cavity of the exhaust manifold casting, it can be guaranteed that shot blasting of the inner cavity is more comprehensive, the situation that the shot blasting quality is uneven is avoided, and the shot blasting quality is improved.

Description

Technical Field

[0001] This invention relates to the field of shot blasting technology for the inner cavity of exhaust manifolds, and more particularly to a shot blasting device for the inner cavity of exhaust pipe castings. Background Technology

[0002] The exhaust manifold is one of the key components of a car engine. Its function is to collect the high-temperature exhaust gases from each cylinder of the engine and guide them into the main exhaust pipe. To meet the requirements of high temperature resistance, corrosion resistance, and complex structure, the exhaust manifold is usually formed by casting high-strength cast iron (such as ductile iron or high-silicon molybdenum cast iron).

[0003] During the casting process, various defects inevitably arise and remain in the inner cavity of the casting, mainly including: adhering sand, oxide scale, and burrs / flashes. If these inner cavity residues are not thoroughly cleaned, they can lead to serious quality problems, such as the risk of detachment: during engine operation, detached fragments can impact the downstream turbocharger blades with the high-speed airflow, causing blade damage or even turbocharger failure; increased flow resistance: residues can reduce the exhaust gas flow cross-section, increase exhaust back pressure, leading to a decrease in engine power and an increase in fuel consumption; and thermal stress concentration: uneven oxide scale and adhering sand can affect the uniform heat dissipation of the casting, potentially causing localized thermal stress concentration and shortening the life of the parts. Therefore, the inner cavity of the exhaust manifold is shot blasted after casting.

[0004] Shot blasting is a highly efficient and environmentally friendly surface treatment process that uses centrifugal force or high-pressure airflow to propel shot (steel shot, cast steel sand, etc.) at high speed onto the surface of a workpiece to remove impurities such as adhering sand and oxide scale.

[0005] In real-world applications, the internal cavity treatment of exhaust manifold castings typically involves workers inserting the shot blasting nozzle of a shot blasting device into the cavity of the exhaust manifold casting. However, since the various manifolds of an exhaust manifold are usually radially distributed and the internal cavity is winding and tortuous, traditional fixed or simple oscillating shot blasting nozzles cannot effectively advance along the complex internal cavity. The shot blasting nozzles tend to directly contact the curved internal wall, resulting in an unfavorable shot angle and a low shot blasting effect on the internal wall. This makes it difficult to effectively cover all internal cavity surfaces, and dead corners are easily formed during cleaning. Therefore, further improvements to the existing technology are necessary. Summary of the Invention

[0006] The purpose of this invention is to provide a shot blasting device for the inner cavity of an exhaust pipe casting, so as to solve the problems of low shot blasting effect on the inner wall in the prior art, inability to effectively cover all inner cavity surfaces, and easy existence of cleaning dead corners.

[0007] The present invention adopts the following technical solution: an internal shot blasting device for an exhaust pipe casting, comprising a shot blasting box and an exhaust manifold casting, wherein a filter plate is provided in the middle of the shot blasting box, and the exhaust flange of the exhaust manifold casting is fixed to the filter plate by a clamping assembly. An internal shot blasting mechanism is provided on the top surface of the shot blasting box, the internal shot blasting mechanism comprising a shot blasting machine provided on the top surface of the shot blasting box, a nozzle assembly provided at the front end of the shot blasting pipe of the shot blasting machine, and an adjustment assembly for moving and feeding the nozzle assembly. The nozzle assembly comprises a nozzle head and several support parts arranged at intervals. The nozzle assembly is connected to the inner cavity of one branch pipe of the exhaust manifold casting by the adjustment assembly, and the nozzle assembly is fed into the inner cavity of the branch pipe. During the process of the nozzle assembly moving and bending along the inner cavity of the branch pipe, the support parts enable the shot blasting pipe to always be in the middle of various positions in the inner cavity of the branch pipe.

[0008] Optionally, the spray head includes a T-shaped tube. The smaller diameter end of the T-shaped tube is threaded to the end of the shot blasting pipe. The outer and inner diameters of the smaller diameter end of the T-shaped tube are the same as those of the shot blasting pipe. A cylindrical component is rotatably installed at the larger diameter end of the T-shaped tube. A conical groove is opened on the inner side of the cylindrical component. A discharge pipe head that is symmetrically arranged on the outer side of the cylindrical component and inclined outwards and communicates with the conical groove is provided.

[0009] Optionally, the support includes a circular tube mounted on the shot blasting pipe. Several sets of limiting strips are arranged circumferentially on the arc surface of the circular tube. A rotating rod is rotatably mounted between each set of limiting strips. A roller is rotatably mounted at the end of the rotating rod. Several T-shaped columns are arranged circumferentially on the arc surface of the circular tube. The smaller diameter end of the T-shaped column faces upward. A T-shaped column is mounted above the T-shaped column. The smaller diameter end of the T-shaped column faces downward. The T-shaped columns are inserted and slidably fitted together. A spring is sleeved and fixed between the T-shaped columns. An abutment block is mounted in the middle of the rotating rod. The bottom end of the abutment block abuts against the top surface of the larger diameter T-shaped column. When the spring is at its original length, the angle between the rotating rod and the axial plane of the shot blasting pipe is less than 90°.

[0010] Optionally, the foremost round tube is located at the connection between the shot blasting pipe and the T-shaped pipe thread.

[0011] Optionally, the adjustment assembly includes symmetrically arranged limiting blocks on the top surface inside the shot blasting chamber. A lead screw is rotatably arranged between the limiting blocks. A motor is provided on the side of one of the limiting blocks, with its output shaft connected to one end of the lead screw. A moving block is threaded onto the lead screw and slides in contact with the inner wall of the shot blasting chamber. A U-shaped plate with its opening facing downward is provided on the bottom surface of the moving block. A lead screw is rotatably arranged between the inner walls of the U-shaped plate. A motor is provided on one side of the U-shaped plate, with its output shaft connected to one end of the lead screw. A moving block is threaded onto the lead screw and slides in contact with the wall of the U-shaped plate. A telescopic cylinder is provided on the bottom surface of the moving block. A rectangular column is horizontally arranged at the moving end of the telescopic cylinder. A cylindrical groove is opened through the middle of the rectangular column. When the nozzle assembly is not working, the entire nozzle assembly is located within the cylindrical groove.

[0012] Optionally, the adjustment assembly also includes Z-shaped connecting plates symmetrically arranged on the upper and lower sides of the rectangular column. The Z-shaped connecting plates are symmetrically rotatably arranged with grooved guide wheels. The grooves of the two guide wheels are in full contact with the front and rear sides of the shot blasting pipe. Motor 3 is provided on the wall surface of each of the two Z-shaped connecting plates. The output shafts of the two motor 3 are fixedly connected to the two guide wheels respectively.

[0013] Optionally, the nozzle assembly also includes an annular disc fitted onto the smaller diameter end of the T-tube. The annular disc is located between the foremost support and the discharge pipe head. An annular groove is formed inside the annular disc, and a chamfer is formed at the outer end of the annular disc. Several air outlet pipes communicating with the annular groove are provided on the chamfered surface. The air outlet pipes are inclined upwards. Sleeves are provided on the arc surface of the lower end of several round pipes. An arc groove is formed on the top surface of the Z-shaped connector on the lower side. An air pipe is inserted into the sleeve. One end of the air pipe is fixedly connected to the annular disc and communicates with the annular groove. The other end of the air pipe passes through the arc groove and the top surface of the shot blasting box and communicates with the output end of the air pump. The air pump is located on the top surface of the shot blasting box.

[0014] Optionally, the clamping assembly includes two L-shaped clamping plates and several bolts and nuts.

[0015] Optionally, the top surface of the filter plate is provided with a through groove that corresponds to and communicates with the opening position of the exhaust flange. The size of the through groove is larger than the size of the exhaust flange opening but smaller than the size of the exhaust flange.

[0016] Optionally, the shot blasting chamber is equipped with double doors on the front side.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. In this application, an internal shot blasting mechanism is provided inside the shot blasting chamber. The internal shot blasting mechanism includes a shot blasting machine located on the top surface of the shot blasting chamber, a nozzle assembly located at the front end of the shot blasting pipe of the shot blasting machine, and an adjustment component for moving and feeding the nozzle assembly. The nozzle assembly includes a nozzle head and several support parts spaced apart. The adjustment component connects the entire nozzle assembly to the inner cavity of one branch pipe of the exhaust manifold casting and feeds the nozzle assembly into the inner cavity of the branch pipe. During the forward bending process of the nozzle assembly along the inner cavity of the branch pipe, the support parts can ensure that the shot blasting pipe is always in the middle of various positions in the inner cavity of the branch pipe, so that the nozzle head can uniformly and comprehensively cover the complex inner cavity of the exhaust manifold casting with shot blasting treatment, avoiding uneven shot blasting layers and improving shot blasting quality and comprehensiveness.

[0018] 2. In this application, the spray head includes a T-shaped tube. The smaller diameter end of the T-shaped tube is threaded to the end of the shot blasting pipe, and the outer and inner diameters of the smaller diameter end of the T-shaped tube are the same as the outer and inner diameters of the shot blasting pipe. The larger diameter end of the T-shaped tube has a cylindrical groove. A cylindrical component is rotatably arranged in the cylindrical groove. A conical groove is arranged on the inner side of the cylindrical component. An outwardly inclined discharge pipe head is symmetrically fixed on the outer side of the cylindrical component. The discharge pipe head communicates with the conical groove. Through the setting of the conical groove, the high-speed moving shot can be smoothly guided and sprayed out through the two discharge pipe heads. Through the setting of the two outwardly inclined discharge pipe heads, when the high-speed shot is discharged through the two discharge pipe heads, the high-speed flowing shot will drive the cylindrical component and the two discharge pipe heads to achieve automatic rotation, thereby realizing circumferential and comprehensive shot blasting treatment of the inner cavity surface.

[0019] 3. In this application, the shot blasting pipeline is provided with several spaced-apart support parts. When the support parts and the shot blasting pipeline enter the inner cavity of the exhaust manifold casting branch pipe together, the rollers at different positions can always be in full contact with the inner wall of the branch pipe due to the cooperation of springs, rotating rods and abutment blocks. This provides support for the shot blasting pipeline and also ensures that the shot blasting pipeline and the nozzle are always in the middle of the branch pipe inner cavity. This makes the distance between the shot ejected from the discharge nozzle and the inner wall consistent when the discharge nozzle rotates for shot blasting. This ensures that the shot blasting quality is the same at all positions on the inner cavity surface, prevents uneven shot blasting effect, and improves shot blasting quality.

[0020] 4. In this application, the nozzle assembly also includes an annular disc fitted onto the smaller diameter end of the T-tube. The annular disc is located between the foremost support and the discharge pipe head. An annular groove is formed inside the annular disc, and a chamfer is formed at the outer end of the annular disc. Several air outlet pipes communicating with the annular groove are provided on the chamfered surface. The air outlet pipes are inclined upwards. Sleeves are fixedly provided on the lower arc surface of several round pipes. An arc groove is formed on the top surface of the Z-shaped connector on the lower side. An air pipe is inserted into the sleeve. One end of the air pipe is fixedly connected to the annular disc and communicates with the annular groove. The other end of the air pipe passes through the arc groove and the top surface of the shot blasting box and communicates with the output end of the air pump. Through the arrangement of the air pipe, the annular disc, the sleeve and several air outlet pipes, when the nozzle assembly is pulled out, the air pump can be used to blow the impurities or shot remaining in the inner cavity of the exhaust manifold casting toward the exhaust flange of the exhaust manifold casting, thereby improving the shot blasting quality and making it more practical. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the shot blasting chamber of the present invention; Figure 3 This is a schematic diagram of the nozzle assembly structure of the present invention. Figure 1 ; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A; Figure 5 This is a cross-sectional structural diagram of the nozzle assembly of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 7 This is a schematic diagram of the nozzle assembly of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the structure of the adjustment component of the present invention; Figure 9 This is a schematic diagram of some parts of the adjustment component of the present invention; Figure 10 This is a schematic diagram of the structure of the filter plate and L-shaped clamping plate of the present invention.

[0022] In the diagram: 1. Shot blasting chamber; 2. Exhaust manifold casting; 3. Filter plate; 4. Clamping assembly; 5. Internal shot blasting mechanism; 6. Shot blasting pipe; 7. Nozzle assembly; 8. Adjustment assembly; 9. Nozzle head; 10. Support part; 11. T-tube; 12. Columnar groove one; 13. Columnar component; 14. Conical groove; 15. Discharge pipe head; 16. Round tube; 17. Limiting strip; 18. Rotating rod; 19. Roller; 20. T-shaped column one; 21. Columnar groove two; 22. Insertion column; 23. Spring; 24. Abutment block; 25. Limiting block; 26. Lead screw one; 27. Motor one; 28. Moving block one; 29. ​​U-shaped plate; 30. Lead screw two; 31. Motor two; 32. Moving block two; 33. Telescopic cylinder; 34. Rectangular column; 35. Columnar groove three; 36. Z-shaped connecting plate; 37. Guide wheel; 38. Motor three; 39. Annular disc; 40. Annular groove; 41. Air outlet pipe; 42. Sleeve; 43. Arc groove; 44. Air pipe; 45. L-shaped clamping plate; 46. Double door; 47. Through groove; 48. T-shaped column two. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only a part of the embodiments disclosed in this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of this invention.

[0024] Various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0025] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0026] Please see Figure 1-10The present invention will now be described in detail with reference to the accompanying drawings and embodiments: A shot blasting device for the inner cavity of an exhaust pipe casting includes a shot blasting box 1 and an exhaust manifold casting 2. A filter plate 3 is provided in the middle of the shot blasting box 1. The exhaust flange of the exhaust manifold casting 2 is fixed to the filter plate 3 by a clamping assembly 4. An inner cavity shot blasting mechanism 5 is provided on the top surface inside the shot blasting box 1. The inner cavity shot blasting mechanism 5 includes a shot blasting machine (not shown) provided on the top surface of the shot blasting box 1, a nozzle assembly 7 provided at the front end of the shot blasting pipe 6 of the shot blasting machine, and an adjustment assembly 8 for moving and feeding the nozzle assembly 7. The nozzle assembly 7 includes a nozzle head 9 and several support parts 10 arranged at intervals. The nozzle assembly 7 is connected to the inner cavity of one branch pipe of the exhaust manifold casting 2 by the adjustment assembly 8, and the nozzle assembly 7 is fed into the inner cavity of the branch pipe. During the process of the nozzle assembly 7 moving and bending along the inner cavity of the branch pipe, the support parts 10 can ensure that the shot blasting pipe 6 is always in the middle of various positions in the inner cavity of the branch pipe.

[0027] The shot blasting machine has a booster air pump and a shot chamber. The booster air pump carries the shot out of the shot chamber and causes the shot to be ejected at high speed from the nozzle along the shot blasting pipe 6. The shot blasting pipe 6 of the shot blasting machine has a certain degree of flexibility. The shot blasting machine is existing technology and will not be described in detail here.

[0028] Please see Figure 3-6 The nozzle 9 includes a T-shaped tube 11. The smaller diameter end of the T-shaped tube 11 is threaded into the end of the shot blasting pipe 6. The outer and inner diameters of the smaller diameter end of the T-shaped tube 11 are the same as the outer and inner diameters of the shot blasting pipe 6. The larger diameter end of the T-shaped tube 11 has a cylindrical groove 12. A cylindrical component 13 is rotatably arranged in the cylindrical groove 12. A conical groove 14 is provided on the inner side of the cylindrical component 13. An outwardly inclined discharge pipe head 15 is symmetrically fixed on the outer side of the cylindrical component 13. The discharge pipe head 15 communicates with the conical groove 14. Through the setting of the conical groove 14, the high-speed moving shot can be smoothly guided and sprayed out through the two discharge pipe heads 15. Through the setting of the two outwardly inclined discharge pipe heads 15, when the high-speed shot is discharged through the two discharge pipe heads 15, the high-speed flowing shot will drive the cylindrical component 13 and the two discharge pipe heads 15 to achieve automatic rotation, thereby realizing circumferential and comprehensive shot blasting treatment of the inner cavity surface.

[0029] Please see Figure 3-7The support part 10 includes a circular tube 16 fixedly mounted on the shot blasting pipe 6. Several sets of limiting strips 17 are arranged circumferentially on the arc surface of the circular tube 16. A rotating rod 18 is rotatably mounted between each set of limiting strips 17. A roller 19 is rotatably mounted at the end of the rotating rod 18. Several T-shaped columns 20 are arranged circumferentially on the arc surface of the circular tube 16. The smaller diameter end of each T-shaped column 20 faces upwards. A cylindrical groove 21 is formed on the top surface of the smaller diameter end of each T-shaped column 20. A second T-shaped column 4 is positioned above each T-shaped column 20. 8. The smaller diameter end of T-shaped column 2 48 faces downwards. A plug-in column 22 is provided on the bottom surface of the smaller diameter end of T-shaped column 2 48. The plug-in column 22 slides in the cylindrical groove 21. A spring 23 is sleeved and fixed between T-shaped column 1 20 and T-shaped column 2 48. An abutment block 24 is fixedly provided in the middle of the rotating rod 18. The bottom end of the abutment block 24 abuts against the top surface of T-shaped column 2 48 with a larger diameter. When the spring 23 is at its original length, the included angle between the rotating rod 18 and the axial plane of the shot blasting pipe 6 is less than 90°.

[0030] When the support part 10 enters the inner cavity of the branch pipe of the exhaust manifold casting 2, the rollers 19 at different positions, due to the cooperation of the spring 23, the rotating rod 18 and the abutment block 24, can always be in full contact with the inner wall of the branch pipe cavity. This provides support for the shot blasting pipe 6 and also ensures that the shot blasting pipe 6 and the nozzle 9 are always in the middle of the branch pipe cavity. As a result, the distance between the shot ejected from the discharge nozzle and the inner wall is consistent when the discharge pipe head 15 rotates for shot blasting. This ensures that the shot blasting quality is the same at all positions on the inner cavity surface, prevents uneven shot blasting effect, and improves shot blasting quality.

[0031] Among them, the foremost round tube 16 is located at the threaded connection between the shot blasting pipe 6 and the T-shaped pipe 11 to prevent bending at the threaded connection from causing connection instability.

[0032] Please see Figure 8-9The adjustment assembly 8 includes symmetrically fixed limiting blocks 25 on the top surface inside the shot blasting chamber 1. A lead screw 26 is rotatably mounted between the limiting blocks 25. A motor 27 is fixedly mounted on the side of one of the limiting blocks 25. The output shaft of the motor 27 is fixedly connected to the end of the lead screw 26. A moving block 28 is threaded onto the lead screw 26. The top surface of the moving block 28 slides in contact with the inner wall of the shot blasting chamber 1. A U-shaped plate 29 with its opening facing downwards is fixedly mounted on the bottom surface of the moving block 28. A second lead screw 3 is rotatably mounted between the inner walls of the U-shaped plates 29. 0. A motor 21 is fixedly installed on one side of the U-shaped plate 29. The output shaft of the motor 21 is fixedly connected to one end of the lead screw 20. A moving block 22 is threaded on the lead screw 20. The top surface of the moving block 22 slides in contact with the wall of the U-shaped plate 29. A telescopic cylinder 33 is fixedly installed on the bottom surface of the moving block 22. A horizontally arranged rectangular column 34 is fixed at the moving end of the telescopic cylinder 33. A columnar groove 35 is opened through the middle of the rectangular column 34. When the nozzle assembly 7 is not working, the entire nozzle assembly 7 is located in the columnar groove 35.

[0033] When shot blasting is required on the inner cavity of the exhaust manifold casting 2, firstly, the moving end of the telescopic cylinder 33 is extended or retracted, so that the nozzle assembly 7 is at the same height as the air inlet flange opening of the exhaust manifold casting 2. Then, the motor 27 is started, which drives the lead screw 26 to rotate. The rotation of the lead screw 26 drives the moving block 28 to move horizontally in the front-back direction, thereby causing the U-shaped plate 29, the moving block 32, the telescopic cylinder 33, and the nozzle assembly 7 to move horizontally in the front-back direction, so that the nozzle assembly 7 is aligned with the inner cavity opening to be shot blasted. Then, the motor 31 is started, which drives the lead screw 30 to rotate. The rotation of the lead screw 30 drives the moving block to move horizontally in the left-right direction, thereby causing the side of the rectangular column 34 to contact the air inlet flange of the exhaust manifold casting 2, and aligning and communicating with the inner cavity opening of the cylindrical groove 35.

[0034] Please see Figure 8-9 The adjustment assembly 8 also includes Z-shaped connecting plates 36 symmetrically arranged on the upper and lower sides of the rectangular column 34. The Z-shaped connecting plates 36 are symmetrically rotatably arranged with grooved guide wheels 37. The grooves of the two guide wheels 37 are in full contact with the front and rear sides of the shot blasting pipe 6. Motors 38 are fixedly arranged on the walls of the two Z-shaped connecting plates 36. The output shafts of the two motors 38 are fixedly connected to the two guide wheels 37 respectively.

[0035] Simultaneously starting two motors 38 causes the two guide wheels 37 to rotate in opposite directions (i.e., when one guide wheel 37 rotates clockwise, the other guide wheel 37 rotates counterclockwise), thereby enabling the shot blasting pipe 6 to be pulled or fed.

[0036] Please see Figure 3-69. The nozzle assembly 7 also includes an annular disc 39 fitted onto the smaller diameter end of the T-shaped tube 11. The annular disc 39 is located between the foremost support part 10 and the discharge pipe head 15. An annular groove 40 is formed inside the annular disc 39, and a chamfer is formed at the outer end of the annular disc 39. Several air outlet pipes 41 communicating with the annular groove 40 are arranged on the chamfered surface. The air outlet pipes 41 are inclined upward. Sleeves 42 are fixedly arranged on the lower arc surface of several round tubes 16. An arc groove 43 is formed on the top surface of the Z-shaped connector on the lower side. An air pipe 44 is inserted into the sleeve 42. One end of the air pipe 44 is fixedly connected to the annular disc 39 and communicates with the annular groove 40. The other end of the air pipe 44 passes through the arc groove 43 and the top surface of the shot blasting box 1 and communicates with the output end of the air pump (not shown). The air pump is set on the top surface of the shot blasting box 1. The air pump is prior art and will not be described in detail here.

[0037] After the nozzle assembly 7 is shot blasted along the inner cavity of the branch pipe to the lowest point, the shot blasting machine is turned off and the air pump is started. The air pump fills the air pipe 44 with air, and the airflow enters the annular groove 40 of the annular disc 39 through the air pipe 44. Then, it blows air onto the inner wall of the branch pipe through several air outlet pipes 41. At the same time, the motor 38 is started, so that the two guide wheels 37 gradually pull the nozzle assembly 7 upward as a whole. During the pulling process, the gas ejected from the air outlet pipes 41 blows the residual impurities or shot from the shot blasting process toward the exhaust flange of the exhaust manifold casting 2.

[0038] Please see Figure 10 The clamping assembly 4 includes two L-shaped clamping plates 45 and several bolts and nuts. The bottom surface of the horizontal plane of the two L-shaped clamping plates 45 is brought into contact with the top surface of the exhaust flange of the exhaust manifold casting 2. Then, the exhaust manifold casting 2 can be fixed by the bolts and nuts cooperating with the filter plate 3.

[0039] Please see Figure 10 The top surface of the filter plate 3 has a through groove 47 that corresponds to and communicates with the opening of the exhaust flange. The size of the through groove 47 is larger than the size of the exhaust flange opening but smaller than the size of the exhaust flange.

[0040] The shot blasting chamber 1 below the filter plate 3 is equipped with a circulation device (not shown) for screening shot and conveying shot to the shot chamber of the shot blasting machine. The circulation device is existing technology and will not be described in detail here.

[0041] Please see Figure 1 The front side of the shot blasting chamber 1 is provided with a double door 46, which is used to load and unload the exhaust manifold casting 2.

[0042] When the exhaust manifold casting 2 needs to undergo internal shot blasting, the operator first opens the double door 46, then places the exhaust flange of the exhaust manifold casting 2 face down on the filter plate 3, aligning the outlet of the exhaust flange with the through groove 47 (at this time, the air inlet flange of the exhaust manifold casting 2 faces the shot blasting mechanism). Then, the exhaust flange (i.e., the entire exhaust manifold casting 2) is fixed to the filter plate 3 using two L-shaped clamping plates 45 and bolts and nuts. The double door 46 is then closed, and the telescopic cylinder 33 is activated to extend or retract, bringing the nozzle assembly 7 to the same height as the air inlet flange opening of the exhaust manifold casting 2. Finally, the motor is started. Motor 27 drives lead screw 26 to rotate, which in turn drives moving block 28 to move horizontally in the front-back direction. This causes U-shaped plate 29, moving block 22, telescopic cylinder 33, and nozzle assembly 7 to move horizontally in the front-back direction, enabling nozzle assembly 7 to align with the inner cavity opening to be shot blasted. Then, motor 21 is started, which drives lead screw 20 to rotate. This causes moving block 2 to move horizontally in the left-right direction, causing the side of rectangular column 34 to contact the air inlet flange of exhaust manifold casting 2, and aligning cylindrical groove 35 with the inner cavity opening.

[0043] After the cylindrical groove of the rectangular column 34 is aligned and connected with one of the inner cavity openings, the shot blasting machine is started. The shot blasting machine generates high-speed moving shot that moves along the shot blasting pipe 6 towards the nozzle assembly 7. When the high-speed moving shot is dispersed along the conical groove 14 and ejected through the two discharge pipe heads 15, the high-speed moving shot will drive the cylindrical component 13 and the two discharge pipe heads 15 to rotate. Thus, the two shot streams ejected by the two discharge pipe heads 15 can perform comprehensive shot blasting treatment on the axial position of the inner wall. Then, the two motors 38 are started, and the two motors 38 drive the two guide wheels 37 to rotate in opposite directions, thereby making the shot blasting pipe The blasting pipe 6 gradually feeds towards the exhaust manifold casting 2, causing the discharge nozzle and several support parts 10 to gradually enter the inner cavity of the branch pipe. After the support parts 10 enter the inner cavity of the branch pipe, due to the cooperation of the spring 23, the abutment block 24 and the rotating button, the roller 19 always makes full contact with the inside of the branch pipe, which can keep the shot blasting pipe 6 and the nozzle 9 in the middle of each position in the inner cavity of the branch pipe. This ensures that the high-speed shot flow ejected from the discharge pipe head 15 is at the same distance from the inner wall of the branch pipe, ensuring that the shot blasting effect is the same at each place, preventing the phenomenon of uneven shot blasting effect, and improving the shot blasting quality.

[0044] Since the support parts 10 are spaced apart, and the diameter of the shot blasting pipe 6 is smaller than the diameter of the inner cavity of the branch pipe, the nozzle assembly 7 can bend along the curved inner cavity to a suitable degree.

[0045] As the discharge pipe head 15 moves from the inlet of the air inlet flange along the inner cavity of the branch pipe to the outlet of the exhaust flange, the shot blasting treatment of the inner wall of one of the branch pipes is completed. Then, the shot blasting machine is turned off, and the air pump is started to fill the air pipe 44 with air. The airflow enters the annular groove 40 through the air pipe 44, and then blows up towards the inner wall of the inner cavity through the outlet pipe 41. At the same time, the motor 38 is started in the reverse direction, and the nozzle assembly 7 is gradually pulled out along the inner cavity of the branch pipe through the two guide wheels 37. During the pulling process, the gas sprayed out by the outlet pipe 41 can discharge the remaining impurities or shot in the inner cavity through the outlet of the exhaust flange.

[0046] Once the foremost discharge pipe head 15 returns to the cylindrical groove 35 of the rectangular column 34, start motor 1 27 and motor 2 31 to align the nozzle assembly 7 with the opening of the next branch pipe cavity. Repeat the above process to perform shot blasting on all the cavities of the exhaust manifold casting 2.

[0047] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0048] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A shot blasting device for the inner cavity of an exhaust pipe casting, characterized in that: The system includes a shot blasting chamber and an exhaust manifold casting. A filter plate is installed in the middle of the shot blasting chamber. The exhaust flange of the exhaust manifold casting is fixed to the filter plate by a clamping assembly. An internal shot blasting mechanism is installed on the top surface of the shot blasting chamber. The internal shot blasting mechanism includes a shot blasting machine installed on the top surface of the shot blasting chamber, a nozzle assembly installed at the front end of the shot blasting pipe of the shot blasting machine, and an adjustment assembly for moving and feeding the nozzle assembly. The nozzle assembly includes a nozzle head and several support parts arranged at intervals. The adjustment assembly connects the entire nozzle assembly to the inner cavity of one of the branch pipes of the exhaust manifold casting and feeds the nozzle assembly into the inner cavity of the branch pipe. During the process of the nozzle assembly advancing and bending along the inner cavity of the branch pipe, the support parts can ensure that the shot blasting pipe is always in the middle of various positions in the inner cavity of the branch pipe.

2. The shot blasting device for the inner cavity of the exhaust pipe casting according to claim 1, characterized in that: The spray head includes a T-shaped tube. The smaller diameter end of the T-shaped tube is threaded to the end of the shot blasting pipe. The outer and inner diameters of the smaller diameter end of the T-shaped tube are the same as those of the shot blasting pipe. A cylindrical component is rotatably installed inside the larger diameter end of the T-shaped tube. A conical groove is opened on the inner side of the cylindrical component. A discharge pipe head that is symmetrically arranged on the outer side of the cylindrical component and inclined outwards and communicates with the conical groove is provided.

3. The shot blasting device for the inner cavity of the exhaust pipe casting according to claim 1, characterized in that: The support includes a circular tube mounted on the shot blasting pipe. Several sets of limiting strips are arranged circumferentially on the arc surface of the circular tube. A rotating rod is rotatably mounted between each set of limiting strips. A roller is rotatably mounted at the end of the rotating rod. Several T-shaped columns are arranged circumferentially on the arc surface of the circular tube. The smaller diameter end of the T-shaped column faces upward. A T-shaped column is mounted above the T-shaped column. The smaller diameter end of the T-shaped column faces downward. The T-shaped columns are inserted and slidably fitted together. A spring is sleeved and fixed between the T-shaped columns. An abutment block is mounted in the middle of the rotating rod. The bottom end of the abutment block abuts against the top surface of the larger diameter T-shaped column. When the spring is at its original length, the angle between the rotating rod and the axial plane of the shot blasting pipe is less than 90°.

4. The shot blasting device for the inner cavity of the exhaust pipe casting according to claim 3, characterized in that: The foremost round tube is located at the connection between the shot blasting pipe and the T-shaped pipe thread.

5. The shot blasting device for the inner cavity of the exhaust pipe casting according to claim 1, characterized in that: The adjustment assembly includes symmetrically arranged limiting blocks on the top surface inside the shot blasting chamber. A lead screw is rotatably arranged between the limiting blocks. A motor is provided on the side of one of the limiting blocks, with its output shaft connected to one end of the lead screw. A moving block is threaded onto the lead screw and slides in contact with the inner wall of the shot blasting chamber. A U-shaped plate with its opening facing downward is provided on the bottom surface of the moving block. A lead screw is rotatably arranged between the inner walls of the U-shaped plate. A motor is provided on one side of the U-shaped plate, with its output shaft connected to one end of the lead screw. A moving block is threaded onto the lead screw and slides in contact with the wall of the U-shaped plate. A telescopic cylinder is provided on the bottom surface of the moving block. A rectangular column is horizontally arranged at the moving end of the telescopic cylinder. A cylindrical groove is opened through the middle of the rectangular column. When the nozzle assembly is not working, the entire nozzle assembly is located within the cylindrical groove.

6. The shot blasting device for the inner cavity of the exhaust pipe casting according to claim 5, characterized in that: The adjustment assembly also includes Z-shaped connecting plates symmetrically arranged on the upper and lower sides of the rectangular column. Grooved guide wheels are symmetrically rotated between the Z-shaped connecting plates. The grooves of the two guide wheels are in full contact with the front and rear sides of the shot blasting pipe. Motor 3 is provided on the wall surface of each of the two Z-shaped connecting plates. The output shafts of the two motor 3 are fixedly connected to the two guide wheels respectively.

7. The shot blasting device for the inner cavity of the exhaust pipe casting according to claim 1, characterized in that: The nozzle assembly also includes an annular disc fitted onto the smaller diameter end of the T-tube. The annular disc is located between the foremost support and the discharge pipe head. An annular groove is formed inside the annular disc, and a chamfer is formed at the outer end of the annular disc. Several air outlet pipes communicating with the annular groove are set on the chamfered surface. The air outlet pipes are inclined upwards. Sleeves are set on the arc surface of the lower end of several round pipes. An arc groove is formed on the top surface of the Z-shaped connector on the lower side. An air pipe is inserted into the sleeve. One end of the air pipe is fixedly connected to the annular disc and communicates with the annular groove. The other end of the air pipe passes through the arc groove and the top surface of the shot blasting box and communicates with the output end of the air pump. The air pump is set on the top surface of the shot blasting box.

8. The shot blasting device for the inner cavity of the exhaust pipe casting according to claim 1, characterized in that: The clamping assembly includes two L-shaped clamping plates and several bolts and nuts.

9. The shot blasting device for the inner cavity of an exhaust pipe casting according to claim 1, characterized in that: The top surface of the filter plate has a through groove that corresponds to and communicates with the opening of the exhaust flange. The size of the through groove is larger than the size of the exhaust flange opening but smaller than the size of the exhaust flange.

10. The shot blasting device for the inner cavity of an exhaust pipe casting according to claim 1, characterized in that: The shot blasting chamber has double doors on the front.

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