A shot blasting device for strengthening the journal surface of a roots blower rotor

Abstract

The application belongs to the technical field of shot blasting, and particularly relates to a shot blasting treatment equipment for surface strengthening of a Roots blower rotor shaft neck, which aims at the problems that in the existing shot blasting equipment, the rotor shaft is subjected to axial thermal expansion caused by the impact of pellets, the rigid center constraint causes the thermal expansion displacement to result in the radial bending of the shaft, the shot blasting impact force causes the elastic bending of the slender shaft, the incidence angle of the pellets is changed, and the uniformity of the strengthening is affected, and the shot blasting treatment equipment comprises a machine base plate and a clamping mechanism, the clamping mechanism comprises a driving center and a driven center, the driven center and a disc spring I are installed on one side of a moving seat, a guide rod is sleeved with a mounting seat, a shot cylinder and a shot blasting mechanism are arranged on the mounting seat, an arc-shaped supporting beam is fixed at the bottom of the mounting seat, and a supporting mechanism is connected to the end of the arc-shaped supporting beam, the supporting mechanism comprises supporting bushes which are arranged on the two sides of the rotor shaft opposite to the shot cylinder, the equipment can absorb the thermal expansion elongation of the shaft through the disc spring I when the shot blasting is performed, and the elastic supporting bushes can balance the shot blasting impact force, so that the shaft axis form and the incidence angle of the pellets are stable.

Description

Technical Field

[0001] This invention relates to the field of shot peening technology, and in particular to a shot peening treatment device for surface strengthening of the journal of a Roots blower rotor. Background Technology

[0002] Shot peening is a commonly used process for surface strengthening of Roots blower rotor journals. During shot peening, high-speed shot impacts the rotor journal surface, causing plastic deformation of the surface material and forming a residual compressive stress layer, thereby improving the fatigue strength and wear resistance of the journal. Rotor shafts are typically slender structures and need to rotate around their own axis during shot peening to ensure that the shot covers the entire circumferential surface.

[0003] In existing shot peening equipment, rotor shafts are generally clamped and positioned by a center mechanism. The center applies an axial clamping force to the shaft end to maintain the axial position. During continuous shot peening, high-energy shot repeatedly impacts the journal surface. Part of the impact energy is converted into heat energy, causing the shaft temperature to rise. The rotor shaft undergoes thermal expansion and elongation along the axial direction. Since the center is mostly a rigid locking structure, the elongation displacement of the shaft end is constrained, and the thermal expansion stress cannot be released along the axial direction. It can only force the shaft to bend and deform in the radial direction. After multiple shot peening treatments, the straightness of the shaft gradually deteriorates, eventually exceeding the tolerance range and leading to scrap. The impact force of shot peening acts continuously on the journal surface, causing the shaft to bear a large radial load in the peening direction. For slender shafts, this radial force can cause elastic bending of the shaft, changing the incident angle of the shot relative to the journal surface. The deviation of the incident angle reduces the uniformity of shot peening coverage, and local areas may experience insufficient strengthening or over-peening, affecting the consistency of surface strengthening effect. Some equipment has a fixed bracket under the shaft to provide radial support. However, the bracket is fixed in position and cannot move synchronously with the shot peening position. There is a distance between the support point and the shot peening point, which has a limited effect on suppressing the bending deformation of the shaft at the shot peening point. At the same time, the surface of the rotor shaft usually has a stepped structure. The fixed bracket is difficult to avoid the steps when the shaft rotates, which can easily cause interference and limit its application range. Summary of the Invention

[0004] The purpose of this invention is to solve the shortcomings of existing shot peening equipment, such as the axial thermal expansion of rotor shafts caused by shot impact, the rigid tip constraining the thermal expansion displacement leading to radial bending of the shaft, and the shot impact force causing elastic bending of slender shafts, changing the shot incident angle and affecting the uniformity of strengthening. Therefore, this invention proposes a shot peening treatment device for surface strengthening of Roots blower rotor journals.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A shot peening treatment device for surface strengthening of the rotor journal of a Roots blower includes a frame base. A base plate and a protective cover are fixed to the top of the frame base by bolts. The base plate is set inside the protective cover. A rotor shaft is provided on the top of the base plate. A clamping mechanism is provided on the top of the base plate for clamping the rotor shaft. The clamping mechanism includes an active center and a driven center. Two guide rods are fixed inside the protective cover. The outer walls of the two guide rods are slidably fitted with the same mounting base. The top of the mounting base is provided with a spray nozzle. The mounting base is provided with a shot peening mechanism for spraying shot onto the rotor shaft through the spray nozzle. The shot peening mechanism includes an air inlet hose and a material guide hose. The air inlet hose and the material guide hose are respectively used to inject compressed air and shot into the spray nozzle. An arc-shaped support beam is fixed to the bottom of the mounting base, and the arc-shaped support beam is located below the rotor shaft. A vertical plate is fixed to the top of the end of the arc-shaped support beam away from the mounting base. A support mechanism is provided on the vertical plate. The support mechanism includes a support tile, which is arranged opposite to the spray nozzle and is respectively arranged on both sides of the rotor shaft.

[0006] In one possible design, the clamping mechanism further includes two three-jaw chucks, which are respectively fixed to the fixed seat and the movable seat on opposite sides. The fixed seat is bolted to the top of the base plate, and the movable seat slides on the top of the base plate via a slide rail. A hydraulic cylinder is fixed to the top of the base plate, and one end of the piston rod of the hydraulic cylinder is fixedly connected to the side of the movable seat away from the fixed seat to drive the movable seat to move. A motor I is fixed to the side of the fixed seat away from the movable seat via a frame, and the output shaft of the motor I rotates through the fixed seat and is fixed thereto. The active center has one end that rotates through an adjacent three-jaw chuck. The three-jaw chuck, located on one side of the movable seat, has a mounting groove on the side near the fixed seat. A sliding column is provided in the mounting groove, and the sliding column slides in the mounting groove via a linear bearing. Multiple disc springs I are fixed on the side of the sliding column near the movable seat. The ends of the multiple disc springs I away from the sliding column are fixedly connected to the inner wall of one side of the mounting groove. The end of the sliding column away from the disc springs I is rotatably connected to a driven center, and the driven center cooperates with the active center to abut and clamp the two ends of the rotor shaft.

[0007] In one possible design, the clamping mechanism further includes multiple sets of ball bearings, which are respectively rolled on the side of the chuck near the rotor shaft. The ball bearings are arranged in an equidistant array of multiple balls.

[0008] In one possible design, the shot peening mechanism further includes a threaded rod, one end of which passes through a mounting base. A nut block with a threaded engagement with the threaded rod is fixed inside the mounting base. One end of the threaded rod is rotatably connected to the side of the fixed base near the movable base, and the other end is rotatably connected to the inner wall of one side of the protective cover. A motor III is fixed to the side of the fixed base away from the movable base via a frame. The output shaft of motor III is fixedly connected to one end of the threaded rod, used to drive the threaded rod to rotate, causing the mounting base to move along the guide rod axis. The shot peening cylinder is fixed to the top of the mounting base by a bracket. A conveying cylinder is fixed to one side of the frame base. A spiral conveying roller is rotatably connected inside the conveying cylinder. A motor II for driving the spiral conveying roller is fixed at the bottom end of the conveying cylinder. A discharge pipe is fixedly connected to one side of the conveying cylinder near the top. The bottom end of the discharge pipe extends into the protective cover and is fixedly connected to a discharge cylinder. The discharge cylinder is fixedly installed inside the protective cover and is used to inject the projectiles in the conveying cylinder into the discharge cylinder. A guide hose is fixedly connected to the bottom of the discharge cylinder. The bottom end of the guide hose is fixedly connected to the spray cylinder. An air inlet hose is fixedly connected to the end of the spray cylinder away from the opening. The air inlet hose extends to one side of the protective cover and is connected to an external compressed air pump.

[0009] In one possible design, the bottom end of the feed hose is tangentially fitted to the top inner wall of the spray nozzle and tangentially fitted along the axis of the spray nozzle.

[0010] In one possible design, the base plate has a trapezoidal groove located between the fixed seat and the movable seat. The top of the frame base has a collection groove connected to the trapezoidal groove. The bottom of the collection groove has an inclined surface for guiding the projectile to one side. A feed pipe is fixedly connected to one side of the conveying cylinder near the bottom. The feed pipe is inclined and its bottom end is fixedly connected to the conveying cylinder. The top end of the feed pipe extends fixedly into the collection groove, reaching the position where the inclined surface in the collection groove is at its lowest point. A crossbeam is fixedly installed in the trapezoidal groove. A guide rail is fixedly installed on the top of the crossbeam, and the movable seat slides with the guide rail via a slider. Multiple longitudinal rods are fixedly passed through the crossbeam, and the two ends of the longitudinal rods are fixedly connected to the inner walls of both sides of the trapezoidal groove.

[0011] In one possible design, the support mechanism further includes a fixed cylinder that slides through the vertical plate, a sliding rod that is slidably connected inside the fixed cylinder, one end of the sliding rod being fixedly connected to the side of the support plate away from the rotor shaft, a disc spring II being fixed between the end of the sliding rod away from the support plate and the inner wall of the fixed cylinder, a plurality of ball bearings II being rolled on the side of the support plate near the rotor shaft, and a limit ring being fixed inside the fixed cylinder, which is used to limit the movement of the sliding rod.

[0012] In one possible design, a protective door panel is slidably provided on one side of the protective cover, and a control center is fixed on one side of the protective cover. The control center is electrically connected to motor III, motor II, motor I, and hydraulic cylinder.

[0013] In one possible design, an electric push rod is fixedly inserted through the vertical plate. An L-shaped connecting plate is fixed to the end of the piston rod of the electric push rod away from the rotor shaft. The L-shaped connecting plate is fixedly connected to the fixed cylinder and is used to drive the fixed cylinder and the support tile to move as a whole. A protective shell II for protecting the electric push rod is fixed to the side of the vertical plate near the rotor shaft. Two laser rangefinders are fixed to the side of the vertical plate near the rotor shaft, and the two laser rangefinders are respectively set on both sides of the support tile.

[0014] In one possible design, the laser rangefinder and the electric push rod are both electrically connected to the control center. Two protective shells I are fixed on the side of the vertical plate near the rotor shaft to protect the laser rangefinder. The protective shell I has a transparent window on the side near the rotor shaft to facilitate the laser rangefinder's distance measurement.

[0015] Beneficial effects: In this invention, by setting up a cooperative structure between disc spring I, sliding column, and driven tip, when the rotor shaft undergoes axial thermal expansion due to shot peening heating, the driven tip pushes the sliding column to compress disc spring I. The elastic deformation of disc spring I absorbs the thermal expansion displacement of the rotor shaft, avoiding rigid restriction at both ends of the rotor shaft. At the same time, the elastic force of disc spring I continuously acts on the driven tip, ensuring that the driven tip always maintains contact with the end face of the rotor shaft. When the rotor shaft cools and shrinks after shot peening, the elastic restoring force of disc spring I pushes the driven tip to compensate for the shrinkage, maintaining the axial positioning accuracy of the rotor shaft. Through the elastic deformation and recovery of disc spring I, the accumulation of axial stress during the thermal expansion and contraction of the rotor shaft is eliminated, preventing the rotor shaft from bending and deforming due to thermal stress, and ensuring the straightness and form and position tolerances of the rotor shaft. In this invention, by setting up a cooperative structure of jaws and ball I, the rotor shaft is axially clamped by the active and driven centers, while the ball I on the jaws provides radial restraint to the outer wall of the rotor shaft. The ball I and the surface of the rotor shaft are in rolling contact, resulting in low friction when the rotor shaft rotates, which will not cause scratches to the surface of the rotor shaft. When the rotor shaft is subjected to shot impact and tends to bend, the jaws provide radial restraint force to the rotor shaft through the ball I, preventing the rotor shaft from detaching from the active and driven centers, thus improving the safety and stability of the shot peening process. In this invention, by setting up a cooperative structure of support tile, sliding rod, fixed cylinder and disc spring II, when the spray gun sprays shot onto the surface of the rotor shaft, the support tile provides radial support force from the back of the rotor shaft under the push of disc spring II. The support force is opposite in direction to the impact force of the shot, and after they cancel each other out, the amount of deflection deformation of the rotor shaft in the radial direction is reduced, so that the axis of the rotor shaft remains stable during the shot peening process. The stable axis position ensures the constant incident angle of the shot, so that the shot peening intensity and coverage of all parts of the rotor shaft surface tend to be consistent, and the uniformity of shot peening is improved. In this invention, by setting ball bearings II, when the support tile contacts the rotor shaft surface, the ball bearings II roll on the rotor shaft surface, changing sliding friction into rolling friction, reducing the friction between the support tile and the rotor shaft, and reducing the wear of the support tile on the rotor shaft surface. At the same time, the ball bearings II and the rotor shaft surface are in point contact, with low contact stress, and will not produce indentations on the rotor shaft surface. When the support tile encounters a step on the rotor shaft surface, the ball bearings II can roll along the contour of the step, avoiding rigid collision between the support tile and the edge of the step, and protecting the support tile and the rotor shaft from damage. In this invention, by setting up a cooperative structure of laser rangefinder, electric push rod and L-shaped connecting plate, the laser rangefinder detects the distance change between the support tile and the rotor shaft surface in real time. When the support tile moves to shaft segments of different diameters on the rotor shaft, the control center controls the electric push rod to drive the fixed cylinder and the support tile to move as a whole according to the detection signal of the laser rangefinder, so that the support tile always keeps in contact with the surface of the rotor shaft. This structure enables the support tile to adaptively track the diameter change of the rotor shaft surface and continuously provide support throughout the entire length of the rotor shaft, adapting to the shot peening requirements of rotor shafts with stepped structures. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a shot peening treatment device for surface strengthening of a Roots blower rotor journal provided by the present invention. Figure 2 A three-dimensional cross-sectional view of a shot peening treatment device for surface strengthening of a Roots blower rotor journal provided by the present invention; Figure 3 A three-dimensional structural schematic diagram of the base plate, fixed seat, movable seat and arc-shaped support beam of a shot peening treatment equipment for surface strengthening of Roots blower rotor journal provided by the present invention; Figure 4 A three-dimensional exploded view of the active center and three-jaw chuck of a shot peening treatment device for surface strengthening of the rotor journal of a Roots blower provided by the present invention; Figure 5A three-dimensional exploded view of the sliding column, disc spring I, and driven tip of a shot peening treatment device for surface strengthening of the rotor journal of a Roots blower provided by the present invention; Figure 6 A three-dimensional exploded view of the discharge cylinder, conveying cylinder, and spiral conveying roller of a shot peening treatment device for surface strengthening of the rotor journal of a Roots blower provided by the present invention; Figure 7 A three-dimensional structural schematic diagram of the mounting base, spray nozzle, and arc-shaped support beam of a shot peening treatment equipment for surface strengthening of the rotor journal of a Roots blower provided by the present invention; Figure 8 A three-dimensional structural schematic diagram of the arc-shaped support beam and support tile of a shot peening treatment device for surface strengthening of the rotor journal of a Roots blower provided by the present invention; Figure 9 A three-dimensional exploded structural diagram of the fixed cylinder, support tile, and laser rangefinder sensor of a shot peening treatment device for surface strengthening of the journal of a Roots blower rotor provided by the present invention; Figure 10 This is a three-dimensional exploded structural diagram of the fixed cylinder, disc spring II, and sliding rod of a shot peening treatment device for surface strengthening of the journal of a Roots blower rotor provided by the present invention.

[0017] In the diagram: 1. Frame base; 2. Base plate; 3. Protective cover; 4. Fixed base; 5. Moving base; 6. Three-jaw chuck; 7. Jaw; 8. Ball bearing I; 9. Motor I; 10. Driving center; 11. Rotor shaft; 12. Mounting slot; 13. Linear bearing; 14. Sliding column; 15. Disc spring I; 16. Driven center; 17. Conveying cylinder; 18. Screw conveying roller; 19. Motor II; 20. Discharge cylinder; 21. Discharge pipe; 22. Guide rod; 23. Threaded rod; 24. Motor III; 25. Mounting base; 26. 27. Spray nozzle; 28. Material guide hose; 29. ​​Air inlet hose; 30. Trapezoidal groove; 31. Collection trough; 32. Feed pipe; 33. Crossbeam; 34. Longitudinal rod; 35. Arc-shaped support beam; 36. Fixed cylinder; 37. Sliding rod; 38. Disc spring II; 39. Support tile; 40. Ball bearing II; 41. Limiting ring; 42. Laser rangefinder sensor; 43. Protective shell I; 44. Electric push rod; 45. L-shaped connecting plate; 46. Protective shell II; 47. Control center; 48. Hydraulic cylinder; 49. Protective door panel; 40. Vertical plate. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] In one embodiment: Refer to Figure 1 and Figure 2A shot peening treatment device for surface strengthening of rotor journals of Roots blowers is disclosed, relating to the field of shot peening technology. It mainly includes a frame base 1, with a base plate 2 and a protective cover 3 bolted to the top of the frame base 1. The base plate 2 is horizontally positioned inside the protective cover 3, which is a closed box structure. An opening is provided on one side of the protective cover 3, and a protective door 48 is slidably installed at the opening. Operators can observe the shot peening operation inside the protective cover 3 through the protective door 48. A rotor shaft 11 is provided on the top of the base plate 2. The rotor shaft 11 is the rotor shaft of the Roots blower, with journals at both ends. The journals require surface strengthening treatment.

[0020] Reference Figures 2-5 The top of the base plate 2 is provided with a clamping mechanism for clamping and fixing the rotor shaft 11. The clamping mechanism includes an active center 10 and a driven center 16, which are respectively located at both ends of the rotor shaft 11. The axes of the active center 10 and the driven center 16 are on the same straight line. The clamping mechanism also includes two three-jaw chucks 6, which are respectively fixed on the side of the fixed seat 4 and the movable seat 5 that are close to each other. The fixed seat 4 is fixedly installed on the top of the base plate 2 by bolts and is located at one end of the base plate 2. The movable seat 5 is slidably installed on the top of the base plate 2 by a slide rail and is located at the other end of the base plate 2. A hydraulic cylinder 47 is fixedly installed on the top of the base plate 2. The cylinder body of the hydraulic cylinder 47 is fixedly installed on the top of the base plate 2 by bolts. One end of the piston rod of the hydraulic cylinder 47 is fixedly connected to the side of the movable seat 5 away from the fixed seat 4. The hydraulic cylinder 47 is used to drive the movable seat 5 to move along the direction of the slide rail on the top of the base plate 2, thereby adjusting the distance between the movable seat 5 and the fixed seat 4.

[0021] Reference Figures 2-5A motor I9 is ​​fixed to the side of the fixed base 4 away from the movable base 5 via a frame. The output shaft of the motor I9 rotates through the fixed base 4. An active center 10 is fixedly installed at the end of the output shaft of the motor I9. One end of the active center 10 rotates through an adjacent three-jaw chuck 6. The tip of the active center 10 faces one end of the rotor shaft 11. The active center 10 is used to abut against one end of the rotor shaft 11. A mounting groove 12 is provided on the side of the three-jaw chuck 6 located on the movable base 5 near the fixed base 4. The mounting groove 12 is a circular groove, and the axis of the mounting groove 12 coincides with the axis of the three-jaw chuck 6. A sliding column 14 is provided in the mounting groove 12. The sliding column 14 is slidably mounted in the mounting groove via a linear bearing 13. Inside the mounting groove 12, the linear bearing 13 is fixed on the inner wall of the mounting groove 12. The outer wall of the sliding column 14 is in sliding fit with the inner ring of the linear bearing 13. Multiple disc springs I 15 are fixedly connected to the side of the sliding column 14 near the moving seat 5. The multiple disc springs I 15 are evenly distributed along the circumference of the sliding column 14. The ends of the multiple disc springs I 15 away from the sliding column 14 are fixedly connected to the inner wall of the mounting groove 12. The driven tip 16 is rotatably connected to the end of the sliding column 14 away from the disc springs I 15. The driven tip 16 is mounted on the end of the sliding column 14 through a bearing. The tip of the driven tip 16 faces the other end of the rotor shaft 11. The driven tip 16 and the driving tip 10 cooperate to abut and clamp the two ends of the rotor shaft 11.

[0022] Specifically, the moving seat 5 is moved by the hydraulic cylinder 47, which in turn controls the active tip 10 and the driven tip 16 to approach each other and clamp the rotor shaft 11. During shot peening, the motor I9 drives the active tip 10 to rotate, which in turn drives the rotor shaft 11 and the driven tip 16 to rotate, thereby performing shot peening on the surface of the rotor shaft 11. When the high-energy shot continuously impacts the surface of the rotor shaft 11 under heavy load, the mechanical work generates transient heat, causing the rotor shaft 11 to undergo axial linear thermal expansion and elongation displacement. The displacement pushes the driven tip 16 and the sliding column 14 and squeezes the disc spring I15 to cause a slight elastic folding and displacement. When the shot peening is completed and the disc spring I15 is cooled and contracted, the disc spring I15 returns to its original shape and continues to press tightly. By utilizing the elasticity of the disc spring I15, the axial axis of the rotor shaft 11 is kept absolutely constant throughout its entire life cycle, physically preventing bending and tensile damage caused by axial thermal distortion.

[0023] Reference Figure 3 and Figure 4The clamping mechanism also includes multiple sets of ball bearing components, which are respectively rolled and arranged on the side of the jaw 7 near the rotor shaft 11. The three-jaw chuck 6 has three jaws 7, and each jaw 7 is provided with a set of ball bearing components on the side near the rotor shaft 11. The ball bearing components are composed of multiple balls I8 arranged in an equidistant array. After the active tip 10 and the driven tip 16 complete the abutment and clamping of the rotor shaft 11, the multiple jaws 7 are driven to move towards the rotor shaft 11 through the cooperation of the jaws 7 and the three-jaw chuck 6, so that the balls I8 abut against the outer wall of the rotor shaft 11. When the active tip 10 drives the rotor shaft 11 to rotate, the rotor shaft 11 can rotate relative to the jaws 7 through the balls I8. When the rotor shaft 11 is hit by a projectile, the multiple jaws 7 can limit the jaws 7 to prevent the rotor shaft 11 from bending under the impact of the projectile and disengaging from the active tip 10 and the driven tip 16.

[0024] Reference Figure 2 , Figure 3 and Figure 7 Two guide rods 22 are fixed inside the protective cover 3. The two guide rods 22 are arranged in parallel. The two ends of the guide rods 22 are fixedly connected to the inner walls of the two sides of the protective cover 3. The outer walls of the two guide rods 22 are slidably fitted with the same mounting base 25. The mounting base 25 has two guide holes. The two guide rods 22 pass through the two guide holes respectively. The mounting base 25 can slide back and forth along the axis of the guide rods 22. A spray nozzle 26 is provided on the top of the mounting base 25. The spray nozzle 26 has a cylindrical structure. One end of the spray nozzle 26 is an open end. The open end of the spray nozzle 26 faces the surface of the rotor shaft 11. The spray nozzle 26 is fixedly installed on the top of the mounting base 25 by a bracket. The axis of the spray nozzle 26 intersects the axis of the rotor shaft 11 perpendicularly in the horizontal direction.

[0025] Reference Figure 2 , Figure 6 and Figure 7The mounting base 25 is equipped with a shot peening mechanism for spraying shot onto the rotor shaft 11 through the spray nozzle 26. The shot peening mechanism includes an air inlet hose 28 and a material guide hose 27, which are used to inject compressed air and shot into the spray nozzle 26, respectively. The shot peening mechanism also includes a threaded rod 23, one end of which passes through the mounting base 25. A nut block that is threadedly engaged with the threaded rod 23 is fixed inside the mounting base 25. The nut block is fixed inside the mounting base 25 by bolts, and the nut block has an internal threaded hole at its center. The threaded rod 23 passes through the internal threaded hole and is threaded into it. One end of the threaded rod 23 is rotatably connected to the side of the fixed seat 4 near the movable seat 5, and the other end of the threaded rod 23 is rotatably connected to the inner wall of one side of the protective cover 3. The fixed seat 4 away from the movable seat 5 is fixed with a motor III 24 via a frame. The output shaft of the motor III 24 is fixedly connected to one end of the threaded rod 23. The motor III 24 is used to drive the threaded rod 23 to rotate. When the threaded rod 23 rotates, it drives the mounting seat 25 to move along the axis of the guide rod 22 through the nut block. An accordion-style dust cover or a telescopic sleeve is also fixed inside the protective cover 3. The accordion-style dust cover is fitted over the threaded rod 23 and the guide rod 22. One end of it is fixedly connected to the mounting seat 25, and the other end is fixedly connected to the inner wall of the protective cover 3. It is used to isolate shot blasting and dust during the movement of the mounting seat 25 and protect the transmission components.

[0026] Reference Figure 2 , Figure 6 and Figure 7 A conveyor cylinder 17 is fixed to one side of the frame base 1. The conveyor cylinder 17 is vertically arranged, and a spiral conveyor roller 18 is rotatably connected inside the conveyor cylinder 17. A motor II 19 is fixed to the bottom end of the conveyor cylinder 17. The output shaft of the motor II 19 extends into the interior of the conveyor cylinder 17 and is fixedly connected to the bottom end of the spiral conveyor roller 18. The motor II 19 is used to drive the spiral conveyor roller 18 to rotate. A discharge pipe 21 is fixedly connected to one side of the conveyor cylinder 17 near the top. The discharge pipe 21 is inclined downward. The bottom end of the discharge pipe 21 extends into the interior of the protective cover 3 and is fixedly connected to a discharge cylinder 20. The discharge cylinder 20 is fixedly installed. Inside the protective cover 3, the upper end of the discharge cylinder 20 is connected to the discharge pipe 21. The discharge cylinder 20 is used to inject the projectiles in the conveying cylinder 17 into the discharge cylinder 20. The bottom of the discharge cylinder 20 is fixedly connected to the guide hose 27. The bottom end of the guide hose 27 is fixedly connected to the spray cylinder 26. The bottom end of the guide hose 27 is tangentially fitted to the top inner wall of the spray cylinder 26 and tangentially fitted along the axis of the spray cylinder 26. The end of the spray cylinder 26 away from the opening is fixedly connected to the air inlet hose 28. The air inlet hose 28 extends to one side of the protective cover 3 and is connected to an external compressed air pump. The air inlet hose 28 is a high-pressure rubber hose.

[0027] Specifically, motor II19 drives the spiral conveyor roller 18 to rotate, conveying the shot in the conveyor cylinder 17 upward and injecting it into the discharge cylinder 20 through the discharge pipe 21. Then, an external compressed air pump injects compressed gas into the spray cylinder 26 through the air inlet hose 28. When the gas is discharged through the open end of the spray cylinder 26, a negative pressure is generated in the guide hose 27 under the action of the air pressure in the spray cylinder 26, which draws the shot in the discharge cylinder 20 into the spray cylinder 26. At this time, the shot is sprayed towards the rotating rotor shaft 11 under the action of the compressed gas, thus completing the shot peening operation. Since the bottom end of the guide hose 27 is tangentially fitted to the top inner wall of the spray cylinder 26 and tangentially fitted along the axis of the spray cylinder 26, when the compressed gas is sprayed out, a negative pressure is generated in the guide hose 27 to adsorb the shot in the discharge cylinder 20 into the spray cylinder 26, preventing the compressed gas from entering the discharge cylinder 20 through the guide hose 27.

[0028] Reference Figure 2 and Figure 3 The base plate 2 has a trapezoidal groove 29 located between the fixed seat 4 and the movable seat 5. The trapezoidal groove 29 extends along the length of the base plate 2, and its cross-section is a trapezoidal shape that is wider at the top and narrower at the bottom. The top of the frame base 1 has a collection trough 30 connected to the trapezoidal groove 29. The collection trough 30 is located inside the frame base 1, and the bottom of the collection trough 30 has an inclined surface with an inclination angle of 15°-30°. The inclined surface is used to guide the projectile to one side. A feed pipe 31 is fixedly connected to one side of the conveying cylinder 17 near the bottom. The feed pipe 31 is inclined, and its bottom end is fixedly connected to the conveying cylinder 17. The top end of the feed pipe 31 extends fixedly into the collection trough 30, reaching the position where the inclined surface is at its lowest point within the collection trough 30. The projectiles accumulated in the collection trough 30 are conveyed to the conveying cylinder 17 through the feed pipe 31, so that the spiral conveying roller 18 can convey the projectiles to the discharge cylinder 20 later. A crossbeam 32 is fixed in the trapezoidal groove 29. The crossbeam 32 is set along the length of the base plate 2. The two ends of the crossbeam 32 are fixedly connected to the inner walls of the two sides of the trapezoidal groove 29. A guide rail is fixed at the top of the crossbeam 32. The guide rail extends along the length of the base plate 2. The movable seat 5 slides with the guide rail through a slider. The slider is fixed at the bottom of the movable seat 5. The slider is sleeved on the guide rail and can slide along the guide rail. Multiple longitudinal rods 33 are fixedly passed through the crossbeam 32. The longitudinal rods 33 are set along the width of the base plate 2. The two ends of the longitudinal rods 33 are fixedly connected to the inner walls of the two sides of the trapezoidal groove 29. The longitudinal rods 33 are used to enhance the structural strength of the crossbeam 32. A screen is installed at the top inlet of the feed pipe 31 to filter out broken bullets and impurities larger than the bullet diameter; a magnetic separator is installed at the bottom of the inclined surface of the collection tank 30 to adsorb metal powder generated by bullet impact. After screening and magnetic separation, the bullets can enter the conveying cylinder 17 through the feed pipe 31 to reduce wear on the screw conveyor roller 18.

[0029] Reference Figure 3 , Figure 6 and Figure 7 An arc-shaped support beam 34 is fixed to the bottom of the mounting base 25. The arc-shaped support beam 34 is an arc-shaped plate structure and is located below the rotor shaft 11. The arc-shaped concave surface of the arc-shaped support beam 34 faces upward. One end of the arc-shaped support beam 34 is fixedly connected to the bottom of the mounting base 25, and the other end of the arc-shaped support beam 34 extends towards the rotor shaft 11. A vertical plate 49 is fixed to the top of the end of the arc-shaped support beam 34 away from the mounting base 25. The vertical plate 49 is vertically set, and the bottom of the vertical plate 49 is fixedly connected to the top of the arc-shaped support beam 34. A support mechanism is provided on the vertical plate 49. The support mechanism is used to support the rotor shaft 11 when the spray nozzle 26 sprays projectiles onto the rotor shaft 11, so as to prevent the rotor shaft 11 from undergoing elastic deformation under the impact of the projectiles and affecting the incident angle of the projectiles.

[0030] Reference Figure 3 and Figures 6-10 The support mechanism includes a support tile 38, which is an arc-shaped tile structure. The arc-shaped concave surface of the support tile 38 faces the surface of the rotor shaft 11. The support tile 38 and the spray nozzle 26 are respectively arranged on both sides of the rotor shaft 11. The support mechanism also includes a fixed cylinder 35 that slides through the vertical plate 49. The fixed cylinder 35 is a cylindrical structure. One end of the fixed cylinder 35 passes through the vertical plate 49 and extends to the side of the vertical plate 49 near the rotor shaft 11. A sliding rod 36 is slidably connected inside the fixed cylinder 35. One end of the sliding rod 36 extends to the outside of the fixed cylinder 35 and is fixedly connected to the side of the support tile 38 away from the rotor shaft 11. The other end of the sliding rod 36 extends into the fixed cylinder 35. Inside 5, a disc spring II 37 is fixed between the end of the sliding rod 36 away from the support plate 38 and the inner wall of the fixed cylinder 35. Multiple balls II 39 are rolled on the side of the support plate 38 near the rotor shaft 11. The balls II 39 are rolled and embedded in the arc-shaped concave surface of the support plate 38, and a part of the balls II 39 protrudes from the surface of the support plate 38. A limiting ring 40 is fixed inside the fixed cylinder 35. The limiting ring 40 is a circular ring structure and is fixed on the inner wall of the fixed cylinder 35 near the support plate 38. The inner diameter of the limiting ring 40 is smaller than the outer diameter of the sliding rod 36. The limiting ring 40 is used to limit the movement of the sliding rod 36 and prevent the sliding rod 36 from coming out of the fixed cylinder 35.

[0031] Specifically, when the mounting base 25 moves the spray nozzle 26 to perform shot peening on the surface of the rotor shaft 11, the mounting base 25 simultaneously moves the vertical plate 49 and the support plate 38. The ball bearing II 39 abuts against the surface of the rotor shaft 11 under the action of the disc spring II 37 and the sliding rod 36. When the impact force of the shot pushes the rotor shaft 11 toward the support plate 38, the displacement of the rotor shaft 11 will in turn push the sliding rod 36 and compress the disc spring II 37. After the disc spring II 37 is compressed, the pressure naturally increases. This increased pressure will push back until it reaches a dynamic balance with the impact force of the shot peening. The setting of the ball bearing II 39 can reduce the friction between the rotor shaft 11 and the support plate 38. In addition, when the support plate 38 encounters a step on the rotor shaft 11, the ball bearing II 39 can prevent the support plate 38 from colliding with the step on the rotor shaft 11.

[0032] Reference Figure 1 , Figure 4 , Figure 6 and Figure 9 A protective door panel 48 is slidably installed on one side of the protective cover 3. The top and bottom of the protective door panel 48 are respectively slidably engaged with the slide rails on the protective cover 3. The protective door panel 48 can slide in the horizontal direction to realize the opening and closing of the protective cover 3. A control center 46 is fixed on one side of the protective cover 3. The control center 46 is a programmable logic controller. The control center 46 is electrically connected to motor III 24, motor II 19, motor I 9 and hydraulic cylinder 47. The laser range sensor 41 and electric push rod 43 are both electrically connected to the control center 46. The control center 46 is used to receive the detection signal of the laser range sensor 41 and control the action of the electric push rod 43 according to the detection signal. The control center 46 is also used to control the speed and direction of motor III 24, the speed of motor II 19, the speed of motor I 9 and the extension and retraction of hydraulic cylinder 47.

[0033] The control center 46 is a programmable logic controller with a pre-installed control program. The control program is configured as follows: first, the hydraulic cylinder 47 is activated to push the moving seat 5 to clamp the rotor shaft 11; then, motor I 9 is activated sequentially or simultaneously to drive the rotor shaft 11 to rotate, the external compressed air pump is activated to supply air, and motor II 19 is activated to drive the screw conveyor roller 18 to supply material; finally, motor III 24 is activated to drive the threaded rod 23 to rotate, so that the mounting seat 25 moves at a constant speed from one end of the rotor shaft 11 to the other end to complete the scanning shot peening treatment of the entire journal surface; after reaching the preset travel distance, the control center 46 stops each component in reverse order and issues an alarm.

[0034] In another embodiment: Refer to Figure 9 and Figure 10An electric push rod 43 is fixedly inserted inside the vertical plate 49. The cylinder of the electric push rod 43 is fixedly installed inside the vertical plate 49. The axis of the electric push rod 43 is parallel to the axis of the fixed cylinder 35. An L-shaped connecting plate 44 is fixed to the end of the piston rod of the electric push rod 43 away from the rotor shaft 11. The L-shaped connecting plate 44 is fixedly connected to the outer wall of the fixed cylinder 35. The L-shaped connecting plate 44 is used to drive the fixed cylinder 35 and the support plate 38 to move as a whole. A protective shell II 45 is fixed to the side of the vertical plate 49 near the rotor shaft 11 to protect the electric push rod 43. The protective shell II 45 is a cylindrical structure and is sleeved on the outside of the electric push rod 43. One end is fixedly connected to the vertical plate 49. Two laser rangefinders 41 are fixed on the side of the vertical plate 49 near the rotor shaft 11. The two laser rangefinders 41 are respectively set on both sides of the support tile 38. The laser rangefinders 41 are reflective laser rangefinders. When encountering a step, the laser rangefinders 41 can detect the height of the step. When the support tile 38 moves to a position with a larger step height, the laser rangefinders 41 detect the height difference of the step. The output shaft of the electric push rod 43 drives the fixed cylinder 35 and the support tile 38 to move the whole body a corresponding distance, so that the support tile 38 and the ball bearings II 39 continuously support the rotor shaft 11.

[0035] Reference Figure 9 Two protective shells I 42 are fixed on the side of the vertical plate 49 near the rotor shaft 11. The protective shells I 42 cover the outside of the laser rangefinder 41 and are used to protect the laser rangefinder 41. A transparent window is provided on the side of the protective shell I 42 near the rotor shaft 11. A transparent glass plate is installed in the transparent window to facilitate the laser beam emitted by the laser rangefinder 41 to pass through the transparent window for distance measurement.

[0036] A method for using shot peening equipment for surface strengthening of Roots blower rotor journals: S1. During operation, the operator first opens the protective door 48 and places the rotor shaft 11 to be processed between the active center 10 and the driven center 16. Then, the operator starts the hydraulic cylinder 47 through the control center 46. The piston rod of the hydraulic cylinder 47 extends and pushes the moving seat 5 to move towards the fixed seat 4. The moving seat 5 drives the driven center 16 to move towards the rotor shaft 11 until the active center 10 and the driven center 16 respectively abut against the two end faces of the rotor shaft 11. Then, the operator uses the matching chuck wrench to insert into the wrench hole of the three-jaw chuck 6 and rotates to drive the three jaws 7 to move radially in sync, so that the ball I 8 abuts against the outer wall of the rotor shaft 11. At this time, the rotor shaft 11 is fixed by the clamping mechanism. S2. Next, the operator closes the protective door 48 and starts motor I9, motor II19, motor III24 and external compressed air pump through the control center 46. Motor I9 drives the active tip 10 to rotate, and the active tip 10 drives the rotor shaft 11 and the driven tip 16 to rotate together. Motor II19 drives the spiral conveying roller 18 to rotate, and the spiral conveying roller 18 conveys the shot at the bottom of the conveying cylinder 17 upward. The shot enters the discharge cylinder 20 through the discharge pipe 21. The external compressed air pump injects compressed air into the spray cylinder 26 through the air inlet hose 28. The compressed air is sprayed out at high speed from the opening end of the spray cylinder 26. When the compressed air flows through the inside of the spray cylinder 26, a negative pressure is generated in the guide hose 27, which draws the shot in the discharge cylinder 20 into the spray cylinder 26. The shot is sprayed at high speed onto the surface of the rotating rotor shaft 11 under the drive of the compressed air, and the journal of the rotor shaft 11 is shot-peened and strengthened. S3. Motor Ⅲ24 drives threaded rod 23 to rotate. Threaded rod 23 drives mounting base 25 to move at a constant speed along the axis of guide rod 22 through nut block. Mounting base 25 drives spray nozzle 26 and arc-shaped support beam 34 to move synchronously. Arc-shaped support beam 34 drives vertical plate 49 and support tile 38 to move synchronously. The ball Ⅱ39 on support tile 38 is always in contact with the surface of rotor shaft 11 under the push of disc spring Ⅱ37. When the impact force of the shot causes rotor shaft 11 to displace towards support tile 38, rotor shaft 11 pushes ball Ⅱ39 and support tile 38. Support tile 38 pushes sliding rod 36 to compress disc spring Ⅱ37. The reaction force generated by disc spring Ⅱ37 is transmitted to rotor shaft 11 through sliding rod 36 and support tile 38, forming support for rotor shaft 11 and offsetting the impact force of shot. S4. When the support tile 38 moves to the step position on the rotor shaft 11, the laser ranging sensors 41 located on both sides of the support tile 38 detect the change in distance between themselves and the surface of the rotor shaft 11. The laser ranging sensors 41 send the detection signal to the control center 46. The control center 46 calculates the height difference of the step based on the detection signal. The control center 46 controls the electric push rod 43 to move. The piston rod of the electric push rod 43 drives the fixed cylinder 35 to move as a whole through the L-shaped connecting plate 44. The fixed cylinder 35 drives the sliding rod 36 and the support tile 38 to move as a whole a corresponding distance, so that the support tile 38 and the ball bearing II 39 always keep in contact with the surface of the rotor shaft 11 and continuously support the rotor shaft 11. S5. During the shot peening process, the shot hits the surface of the rotor shaft 11 and falls downwards. It enters the collection tank 30 through the trapezoidal groove 29. The inclined surface at the bottom of the collection tank 30 guides the shot to the top inlet of the feed pipe 31. The shot flows back to the conveying cylinder 17 through the feed pipe 31, realizing the recycling of the shot. S6. After shot peening is completed, the control center 46 shuts down motor I9, motor II19, motor III24 and compressed air pump in sequence. After the rotor shaft 11 stops rotating, the operator opens the protective door 48, turns the wrench on the three-jaw chuck 6 to release the jaws 7, and then controls the piston rod of the hydraulic cylinder 47 to retract through the control center 46. The moving seat 5 drives the driven center 16 to move away from the fixed seat 4, releasing the clamp on the rotor shaft 11. The operator takes out the processed rotor shaft 11, completing the entire shot peening process. S7. During the entire shot peening process, when the rotor shaft 11 undergoes axial thermal expansion due to the heat generated by the shot impact, the length of the rotor shaft 11 increases. One end of the rotor shaft 11 pushes the driven tip 16 to move towards the moving seat 5. The driven tip 16 pushes the sliding column 14 to slide along the linear bearing 13 into the mounting groove 12. The sliding column 14 compresses the disc spring I 15. The elastic deformation of the disc spring I 15 absorbs the thermal expansion displacement of the rotor shaft 11. At the same time, the elastic force of the disc spring I 15 always maintains the thrust on the driven tip 16, so that the driven tip 16 continuously abuts against the end face of the rotor shaft 11. When the shot peening process is completed and the rotor shaft 11 cools and shrinks, the elastic restoring force of the disc spring I 15 pushes the sliding column 14 and the driven tip 16 to move towards the rotor shaft 11, always maintaining reliable clamping of the rotor shaft 11. S8. During the process of the mounting base 25 driving the spray nozzle 26 to move along the guide rod 22, the mounting base 25 drives the vertical plate 49 and the support tile 38 to move synchronously through the arc-shaped support beam 34. Since the spray nozzle 26 and the support tile 38 are respectively set on both sides of the rotor shaft 11, the spray direction of the spray nozzle 26 is opposite to the support direction of the support tile 38. The support tile 38 always provides support for the rotor shaft 11 at the opposite position of the spray nozzle 26. The support position of the support tile 38 and the spray position of the spray nozzle 26 are consistent in the axial direction of the rotor shaft 11, ensuring that at every axial position of the shot impact, the back of the rotor shaft 11 is supported by the support tile 38, effectively preventing the rotor shaft 11 from bending and deforming under the shot impact. S9. When the ball bearing II 39 on the support bearing 38 contacts the surface of the rotor shaft 11, the ball bearing II 39 rolls on the surface of the rotor shaft 11, changing the sliding friction into rolling friction, reducing the friction between the support bearing 38 and the rotor shaft 11. At the same time, the ball bearing II 39 and the surface of the rotor shaft 11 are in point contact, with a small contact area, so it will not scratch the surface of the rotor shaft 11. When the support bearing 38 encounters a step on the rotor shaft 11, the ball bearing II 39 can roll along the contour of the step, avoiding a rigid collision between the edge of the support bearing 38 and the step. During the process of conveying the shot, the spiral conveying roller 18 in the conveying cylinder 17 lifts the shot from the bottom to the top of the conveying cylinder 17. The dust and broken shot fragments carried by the shot during the lifting process settle in the conveying cylinder 17, reducing the amount of dust entering the discharge cylinder 20. The inclined surface at the bottom of the collection trough 30 can automatically guide the collected shot to the inlet of the feed pipe 31 without the need for an additional conveying device, thus reducing the energy consumption of the equipment.

[0037] However, as is well known to those skilled in the art, the working principles and wiring methods of the laser rangefinder 41, electric push rod 43, motor III 24, motor II 19, motor I 9, hydraulic cylinder 47 and control center 46 are all conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0038] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A shot peening treatment device for surface strengthening of the journal of a Roots blower rotor, characterized in that, The system includes a frame base (1), on which a base plate (2) and a protective cover (3) are bolted together. The base plate (2) is located inside the protective cover (3). A rotor shaft (11) is provided on the top of the base plate (2). A clamping mechanism is provided on the top of the base plate (2) for clamping the rotor shaft (11). The clamping mechanism includes an active center (10) and a driven center (16). The clamping mechanism also includes two three-jaw chucks (6). The jaw chuck (6) is fixed on the side of the fixed seat (4) and the movable seat (5) respectively. The fixed seat (4) is fixed to the top of the base plate (2) by bolts. The movable seat (5) slides on the top of the base plate (2) by a slide rail. A hydraulic cylinder (47) is fixed on the top of the base plate (2). One end of the piston rod of the hydraulic cylinder (47) is fixedly connected to the side of the movable seat (5) away from the fixed seat (4) for driving the movable seat (5) to move. A motor I (9) is fixed on the side of the fixed seat (4) away from the movable seat (5) by a frame. The output shaft of the motor I (9) rotates through the fixed seat (4) and is fixed with an active center (10). One end of the active center (10) rotates through the adjacent three-jaw chuck (6). The three-jaw chuck (6) located on the side of the movable seat (5) is provided with a mounting groove (12) on the side of the fixed seat (4). A sliding column (14) is provided in the mounting groove (12). The sliding column (14) is connected by a linear bearing (1) 3) Sliding in the mounting groove (12), the sliding column (14) is fixed with multiple disc springs I (15) on the side near the moving seat (5), and the ends of the multiple disc springs I (15) away from the sliding column (14) are fixedly connected to the inner wall of one side of the mounting groove (12). The end of the sliding column (14) away from the disc springs I (15) is rotatably connected to the driven tip (16), and the driven tip (16) and the driving tip (10) cooperate to abut and clamp the two ends of the rotor shaft (11); The clamping mechanism also includes multiple sets of ball bearing components, which are respectively rolled on the side of the chuck (7) near the rotor shaft (11). The ball bearing components are arranged in an equidistant array of multiple balls I (8). The protective cover (3) has two guide rods (22) fixed inside. The outer walls of the two guide rods (22) are slidably fitted with the same mounting base (25). The top of the mounting base (25) is provided with a spray nozzle (26). The mounting base (25) is provided with a shot blasting mechanism for spraying shot onto the rotor shaft (11) through the spray nozzle (26). The shot blasting mechanism includes an air inlet hose (28) and a material guide hose (27). The air inlet hose (28) and the material guide hose (27) are respectively used to inject compressed air and shot into the spray nozzle (26). The bottom of the mounting base (25) is fixed with an arc-shaped support beam (34), and the arc-shaped support beam (34) is located below the rotor shaft (11). The top of the arc-shaped support beam (34) away from the mounting base (25) is fixed with a vertical plate (49). The vertical plate (49) is provided with a support mechanism, which includes a support tile (38). The support tile (38) is arranged opposite to the spray nozzle (26) and is respectively arranged on both sides of the rotor shaft (11).

2. The shot peening equipment for surface strengthening of the rotor journal of a Roots blower according to claim 1, characterized in that, The shot peening mechanism also includes a threaded rod (23), one end of which passes through a mounting base (25). A nut block that is threadedly engaged with the threaded rod (23) is fixed inside the mounting base (25). One end of the threaded rod (23) is rotatably connected to the side of the fixed base (4) near the moving base (5). The other end of the threaded rod (23) is rotatably connected to the inner wall of one side of the protective cover (3). A motor III (24) is fixed to the side of the fixed base (4) away from the moving base (5) via a frame. The output shaft of the motor III (24) is fixedly connected to one end of the threaded rod (23) for driving the threaded rod (23) to rotate, thereby moving the mounting base (25) along the axis of the guide rod (22). The shot peening cylinder (26) is fixed to the top of the mounting base (25) via a bracket. A conveying cylinder (17) is fixed to one side of the frame base (1). 17) A spiral conveying roller (18) is rotatably connected inside. A motor II (19) for driving the spiral conveying roller (18) to rotate is fixed at the bottom end of the conveying cylinder (17). A discharge pipe (21) is fixedly connected to one side of the conveying cylinder (17) near the top. The bottom end of the discharge pipe (21) extends into the protective cover (3) and is fixedly connected to the discharge cylinder (20). The discharge cylinder (20) is fixedly installed inside the protective cover (3) for injecting the projectiles in the conveying cylinder (17) into the discharge cylinder (20). A guide hose (27) is fixedly connected to the bottom of the discharge cylinder (20). The bottom end of the guide hose (27) is fixedly connected to the spray cylinder (26). An air inlet hose (28) is fixedly connected to the end of the spray cylinder (26) away from the opening. The air inlet hose (28) extends to one side of the protective cover (3) and is connected to an external compressed air pump.

3. The shot peening equipment for surface strengthening of the rotor journal of a Roots blower according to claim 2, characterized in that, The bottom end of the material guide hose (27) is tangentially fitted to the top inner wall of the spray nozzle (26) and tangentially fitted along the axis of the spray nozzle (26).

4. The shot peening equipment for surface strengthening of the rotor journal of a Roots blower according to claim 3, characterized in that, The base plate (2) is provided with a trapezoidal groove (29) between the fixed seat (4) and the movable seat (5). The top of the frame base (1) is provided with a collection groove (30) that communicates with the trapezoidal groove (29). The bottom of the collection groove (30) is provided with an inclined surface for guiding the projectile to one side. A feed pipe (31) is fixedly connected to one side of the conveying cylinder (17) near the bottom. The feed pipe (31) is inclined and the bottom end of the feed pipe (31) is fixedly connected to the conveying cylinder (17). The top end of the feed pipe (31) is fixedly extended into the collection trough (30), and the top end of the feed pipe (31) extends to the position where the inclined surface of the collection trough (30) is low. A crossbeam (32) is fixed in the trapezoidal groove (29), and a guide rail is fixed at the top of the crossbeam (32). The moving seat (5) slides with the guide rail through a slider. Multiple longitudinal rods (33) are fixedly passed through the crossbeam (32), and the two ends of the longitudinal rods (33) are fixedly connected to the inner walls of both sides of the trapezoidal groove (29).

5. The shot peening equipment for surface strengthening of the rotor journal of a Roots blower according to claim 4, characterized in that, The support mechanism also includes a fixed cylinder (35) that slides through the vertical plate (49). A sliding rod (36) is slidably connected inside the fixed cylinder (35). One end of the sliding rod (36) is fixedly connected to the side of the support tile (38) away from the rotor shaft (11). A disc spring II (37) is fixed between the end of the sliding rod (36) away from the support tile (38) and the inner wall of the fixed cylinder (35). Multiple balls II (39) are rolled on the side of the support tile (38) near the rotor shaft (11). A limit ring (40) is fixed inside the fixed cylinder (35), and the limit ring (40) is used to limit the movement of the sliding rod (36).

6. The shot peening equipment for surface strengthening of the rotor journal of a Roots blower according to claim 5, characterized in that, A protective door panel (48) is slidably provided on one side of the protective cover (3), and a control center (46) is fixed on one side of the protective cover (3). The control center (46) is electrically connected to motor III (24), motor II (19), motor I (9) and hydraulic cylinder (47).

7. The shot peening equipment for surface strengthening of the rotor journal of a Roots blower according to claim 6, characterized in that, An electric push rod (43) is fixedly inserted inside the vertical plate (49). An L-shaped connecting plate (44) is fixed at the end of the piston rod of the electric push rod (43) away from the rotor shaft (11). The L-shaped connecting plate (44) is fixedly connected to the fixed cylinder (35) and is used to drive the fixed cylinder (35) and the support tile (38) to move as a whole. A protective shell II (45) for protecting the electric push rod (43) is fixed on the side of the vertical plate (49) near the rotor shaft (11). Two laser rangefinders (41) are fixed on the side of the vertical plate (49) near the rotor shaft (11), and the two laser rangefinders (41) are respectively set on both sides of the support tile (38).

8. The shot peening equipment for surface strengthening of the rotor journal of a Roots blower according to claim 7, characterized in that, The laser rangefinder (41) and the electric push rod (43) are both electrically connected to the control center (46). Two protective shells I (42) are fixed on the side of the vertical plate (49) near the rotor shaft (11) to protect the laser rangefinder (41). The protective shell I (42) has a transparent window on the side near the rotor shaft (11) to facilitate the laser rangefinder (41) to measure distance.

Images