A bush press equipment with self-centering function

Abstract

The application discloses a bushing press-fitting equipment with a self-centering function, which comprises a horizontal workbench, a volute assembly positioning device vertically arranged on one side of the upper end face of the workbench, the volute assembly positioning device being used for horizontally fixing the volute assembly on the upper end of the workbench, and a horizontal bushing extrusion device arranged on the other side of the upper end of the workbench, the bushing extrusion device comprising a pressing block driving part, the fixed end of the pressing block driving part being fixedly connected with the workbench, the movable end of the pressing block driving part being provided with a mounting hole corresponding to the valve cover shaft, and the movable end of the pressing block driving part being connected with a pressing block through a floating extrusion structure, the floating extrusion structure being used for coaxially arranging the pressing block and the bushing; the pressing block driving part is used for driving the pressing block to move leftward and rightward; and the bushing can be positioned with the pressing block in advance during the extrusion of the bushing, and the bushing can be assembled under the premise of accurate positioning.

Description

Technical Field

[0001] This invention relates to the field of bushing pressing, and more particularly to a bushing pressing device with a self-centering function. Background Technology

[0002] A bushing is a ring-shaped structural component with sealing and wear protection functions, mainly used in mechanical fields such as valves and bearings. In existing technologies, materials with low hardness and good wear resistance are typically selected for bushings or shrouds. This reduces wear on the shaft and housing, allowing for replacement when the bushing or shroud wears to a certain extent, thus saving on the cost of replacing the shaft or housing. Bushings can be made of corrosion-resistant materials such as polytetrafluoroethylene (PTFE) and graphite to reduce equipment maintenance costs. During machining, the accuracy of the taper angle difference and wall thickness difference of the setter sleeve must be controlled.

[0003] During the press-fitting of the valve cover shaft bushing in the volute assembly, the bushing to be installed and the valve cover shaft need to be coaxially set on both sides of the valve cover assembly. A pressure block is used to press the bushing to be installed towards the valve cover shaft side until the end face of the valve cover shaft protrudes from the end face of the corresponding bushing by a set length (e.g., an exposed height of 2.27 cm). However, the existing pressure block cannot accurately position itself to the end face of the bushing in the circumference when pressing the bushing. The pressure block will interfere with the valve cover shaft, causing damage to the surface of the valve cover shaft 4, or the pressure block cannot apply pressure evenly to the end face of the bushing, resulting in the bushing tilting, which will affect the service life of the bushing. Summary of the Invention

[0004] The purpose of this invention is to provide a bushing pressing device with a self-centering function, which can first position the bushing and the pressing block during the bushing pressing process, and then assemble the bushing under the premise of precise positioning.

[0005] The present invention adopts the following technical solution: A bushing pressing device with self-centering function includes a horizontal worktable. A volute assembly positioning device is vertically arranged on one side of the upper surface of the worktable to fix the volute assembly horizontally on the upper surface of the worktable. The mounting hole of the volute assembly, which is provided with a valve cover shaft, is correspondingly arranged with the bushing pressing device. A horizontal bushing pressing device is arranged on the other side of the upper surface of the worktable. The bushing pressing device includes a pressing block driving part. The fixed end of the pressing block driving part is fixedly connected to the worktable, and the movable end of the pressing block driving part is correspondingly arranged with the mounting hole of the valve cover shaft. The movable end of the pressing block driving part is connected to the pressing block through a floating pressing structure. The floating pressing structure is used to make the pressing block and the bushing coaxial. The pressing block driving part is used to drive the pressing block to move left and right.

[0006] Furthermore, the pressing block driving unit includes a horizontally arranged extrusion cylinder. The fixed end of the extrusion cylinder is fixedly set to the right side of the upper surface of the workbench through a vertical positioning plate. Guide rods are horizontally fixed at both ends of the positioning plate. A moving plate is slidably arranged in the middle of the guide rods. The moving end of the extrusion cylinder is fixedly connected to the right end face of the moving plate. A floating extrusion structure is set at the position of the mounting hole through which the valve cover shaft passes on the left end face of the moving plate.

[0007] Furthermore, the floating extrusion structure includes a floating part connected to the middle of the left end face of the moving plate and a coaxial positioning part disposed on the left side of the floating part. The floating part includes a cylindrical fixed seat fixedly connected to the left end face of the moving plate. A first slider is slidably disposed on the left side of the fixed seat, and a second slider is slidably disposed on the left side of the first slider. A coaxial positioning part is coaxially disposed on the left side of the second slider.

[0008] Furthermore, the left end face of the fixed seat is provided with a first sliding groove, and the right end face of the first slider is fixedly provided with a first slide rail at the corresponding position of the first sliding groove. A first return spring is provided on the right side of the front end of the first slide rail. The front end of the first return spring is fixed to the circumference of the fixed seat, and the rear end of the first return spring is fixed to the rear end of the first slide rail through a first spring seat. The left end face of the first slider is provided with a second sliding groove, and the right end face of the second slider is fixedly provided with a second slide rail at the corresponding position of the second sliding groove. A second return spring is provided on the right side of the upper end of the first slide rail. The lower end of the second return spring is fixed to the circumference of the first slider, and the upper end of the first return spring is fixed to the upper end of the second slide rail through a second spring seat. A coaxial positioning part is provided on the left end of the second slider. The coaxial positioning part is used to move the drive to be coaxial with the bushing. The first return spring and the second return spring are in their natural state.

[0009] Furthermore, the coaxial positioning part includes a positioning cylinder coaxially fixed to the left end of the second slider. Three sets of reversing parts are evenly arranged circumferentially on the left end of the positioning cylinder. Each set of reversing parts has a supporting pressure head and a pressure block at its inner and outer ends, respectively. When the pressure block at the outer end moves to the right relative to the positioning cylinder, the bushing applies a rightward reaction force to the pressure block. When the supporting pressure head at the inner end moves to the right relative to the positioning cylinder, the reaction force between the valve cover shaft and the supporting pressure head drives the supporting pressure head to move to the right.

[0010] Furthermore, the positioning cylinder is circumferentially provided with three sets of receiving slots, and each set of receiving slots is provided with a reversing part; each set of reversing parts includes a reversing gear arranged radially along the positioning cylinder and arranged in the corresponding receiving slot. Each set of reversing gears is rotatably connected to the side wall of the corresponding positioning cylinder through a gear shaft. A first rack meshes with the outer side of each set of reversing gears, and a pressure block is connected to the lower end of each set of first racks. A second rack meshes with the inner side of each set of reversing gears, and a support pressure head is connected to the lower end of each set of second racks. A guide cylinder is coaxially fixedly sleeved on the outside of the positioning cylinder. The guide cylinder is circumferentially provided with three sets of guide slots corresponding to the receiving slots. An outer positioning block is slidably arranged left and right in each set of guide slots. The inner end of the outer positioning block is fixedly connected to the first rack. The inner sides of the three sets of second racks are fixedly connected to each other through the inner positioning blocks.

[0011] Furthermore, the outer surface of each set of support pressure heads is a conical surface, and the maximum circumferential diameter formed by the three sets of support pressure heads is greater than the corresponding bushing diameter. The inner end face of each set of pressure blocks is provided with an arc surface, and the arc surface is provided in correspondence with the arc inner wall of the bushing.

[0012] Furthermore, each set of pressure blocks has a T-slot on its right end face, and a T-block corresponding to the T-slot is fixedly installed at the lower end of the first rack. The T-block slides along the inside and outside of the T-slot. A first positioning spring is installed at the outer end of the T-block. The inner end of the first positioning spring is connected to the T-block, and the outer end of the first positioning spring is fixed to the outer end of the pressure block through a baffle. The first positioning spring is in a compressed state. The left end face of each set of pressure blocks is an inclined surface at a set angle. A second positioning spring is installed at the upper end of each set of outer positioning blocks. The upper, lower, left, and right ends of the second positioning spring are respectively fixed to the right end of the outer positioning block and the right side face of the guide groove. The second positioning spring is in a natural state.

[0013] Furthermore, the volute assembly positioning device includes a limiting part coaxially disposed in the circular inner cavity of the volute, and a cylindrical machining platform coaxially disposed below the limiting part; the limiting part is used to limit the inner cavity of the volute and the machining platform coaxially; a limiting block is provided on the side of the volute assembly near the mounting hole through which the valve cover shaft passes, and the limiting block is in close contact with the flange end face on the lower side of the volute assembly.

[0014] Furthermore, an auxiliary limiting part is provided on the lower right side of the planar boss. The auxiliary limiting part includes a limiting block fixedly disposed on the left end face of the moving plate. The limiting block is covered with a limiting sleeve with an opening at the right end. A compression spring is disposed in the inner cavity of the limiting block. The compression spring is in a natural state. The left and right ends of the compression spring are respectively fixed to the bottom surface of the inner cavity of the limiting sleeve and the end face of the limiting block. The left end face of the limiting sleeve extends to contact the planar boss.

[0015] I. By setting a floating part, the pressure block is moved up and down and left and right by the floating part during the coaxial positioning of the bushing by the coaxial positioning part, so that the coaxial positioning part and the bushing are set concentrically. This ensures that the coaxial positioning part can apply a stable extrusion force to the bushing (the bushing wall is in uniform contact with the coaxial positioning part), and also promotes the subsequent coaxial positioning action of the coaxial positioning part.

[0016] Second, by setting a coaxial positioning part, during the process of the pressure block extruding the bushing, the reaction force applied by the bushing to the pressure block causes the supporting pressure head to be positioned at three points in the inner cavity of the bushing. After the supporting pressure head is limited, the bushing is extruded again. At the same time, the reaction force of the valve cover shaft on the supporting pressure head extrudes the pressure block a second time (making the valve cover shaft protrude from the end face of the bushing by a set distance). This reduces the probability of interference between the pressure block and the valve cover shaft, and enables a single linear extrusion action to achieve multiple mutually reinforcing effects.

[0017] Third, by setting up a limiting part, a limiting block and an auxiliary limiting part in cooperation, the operator only needs to place the volute assembly on the upper part of the processing platform. The limiting part can restrict the degree of freedom of movement of the volute assembly. Furthermore, the combination of the limiting block and the auxiliary limiting part restricts the degree of freedom of rotation of the volute assembly during the movement of the moving plate (during the extrusion process), which reduces the workload of the operator and improves the work efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the bushing extrusion device in this invention; Figure 2 This is a schematic diagram of the extrusion cylinder in this invention; Figure 3 for Figure 2 An enlarged diagram of A in the diagram; Figure 4 This is a schematic diagram of the bushing structure in this invention; Figure 5 This is a schematic diagram of the structure of the first slide rail in this invention; Figure 6 This is a schematic diagram of the structure of the second reset spring in this invention; Figure 7 This is a schematic diagram of the pressure block in the present invention; Figure 8 This is a schematic diagram of the structure of the inner positioning block in this invention; Figure 9 This is a schematic diagram of the structure of the outer positioning block in this invention; Figure 10 This is a schematic diagram of the T-slot structure in this invention; Figure 11 This is a schematic diagram of the T-shaped block in this invention; Figure 12This is a schematic diagram of the processing platform in this invention; Figure 13 This is a schematic diagram of the flange structure in this invention; Figure 14 This is a schematic diagram of the slide bar in this invention; Figure 15 for Figure 14 Enlarged diagram of B in the diagram.

[0019] In the diagram, 1. Workbench; 2. Positioning device; 3. Bushing extrusion device; 4. Valve cover shaft; 5. Pressure block; 6. Bushing; 7. Extrusion cylinder; 8. Positioning plate; 9. Guide rod; 10. Moving plate; 11. Fixed seat; 12. First slider; 13. Second slider; 14. First slide groove; 15. First slide rail; 16. First return spring; 17. First spring seat; 18. Second slide rail; 19. Second return spring; 20. Positioning cylinder; 21. Supporting pressure head; 22. Receiving through groove; 23. Reversing gear; 24. First rack. 25. Second rack; 26. Guide groove; 27. Outer positioning block; 28. Inner positioning block; 29. ​​T-slot; 30. T-block; 31. First positioning spring; 32. Baffle; 33. Second positioning spring; 34. Machining platform; 35. Flange; 36. Limiting block; 37. Limiting sleeve; 38. Flat boss; 39. Moving cylinder; 40. Rotating cylinder; 41. Compression spring; 42. Slide rod; 43. Upper support rod; 44. Lower support rod; 45. Drive cylinder; 46. Yielding sleeve; 47. Limiting stop; 48. Guide cylinder. Detailed Implementation

[0020] Please see Figure 1-15 The present invention will now be described in detail with reference to the accompanying drawings and embodiments: The bushing pressing equipment with self-centering function of the present invention includes a horizontal worktable 1. A volute assembly positioning device 2 is vertically arranged on one side of the upper end of the worktable 1. The volute assembly positioning device 2 is used to fix the volute assembly horizontally on the upper end of the worktable 1. At this time, the mounting hole of the valve cover shaft 4 passing through the volute assembly is correspondingly arranged with the bushing pressing device 3. A horizontal bushing pressing device 3 is arranged on the other side of the upper end of the worktable 1. The bushing pressing device 3 includes a pressing block driving part. The fixed end of the pressing block driving part is fixedly connected to the worktable 1. The movable end of the pressing block driving part is correspondingly arranged with the mounting hole of the valve cover shaft 4 passing through it. The movable end of the pressing block driving part is connected to the pressing block 5 through a floating pressing structure. The floating pressing structure is used to make the pressing block 5 and the bushing 6 coaxially arranged. The pressing block driving part is used to drive the pressing block 5 to move left and right.

[0021] In this invention, the pressing block driving unit includes a horizontally arranged extrusion cylinder 7. The fixed end of the extrusion cylinder 7 is fixedly arranged to the right side of the upper surface of the worktable 1 through a vertical positioning plate 8. The front and rear ends of the positioning plate 8 are horizontally fixed with guide rods 9. A moving plate 10 is slidably arranged in the middle of the guide rods 9. The moving end of the extrusion cylinder 7 is fixedly connected to the right end of the moving plate 10. A floating extrusion structure is provided at the position of the mounting hole through which the valve cover shaft 4 passes on the left end of the moving plate 10.

[0022] In use, the operator places the bushing 6 horizontally between the mounting hole through which the valve cover shaft 4 passes and the pressure block 5, and starts the pressure block drive unit, causing the moving end of the extrusion cylinder 7 to drive the floating extrusion structure to move towards the bushing 6. While the floating extrusion structure extrudes the bushing 6, it is subjected to the reaction force of the bushing 6 on the floating extrusion structure. Through the reaction force of the bushing 6 on the floating extrusion structure, the pressure block 5, which is set around the circumference of the floating extrusion structure, is evenly set on the right side of the circumference of the bushing 6 wall. The moving end of the extrusion cylinder 7 continues to move towards the bushing 6 and drives the bushing 6 to press into the mounting hole through which the valve cover shaft 4 passes, until the end face of the valve cover shaft 4 protrudes by a set length corresponding to the end face of the bushing 6.

[0023] In this invention, the floating extrusion structure includes a floating part connected to the middle of the left end face of the moving plate 10 and a coaxial positioning part disposed on the left side of the floating part. The floating part includes a cylindrical fixed seat 11 fixedly connected to the left end face of the moving plate 10. A first slider 12 is slidably disposed on the left side of the fixed seat 11, and a second slider 13 is slidably disposed on the left side of the first slider 12, and a coaxial positioning part is coaxially disposed on the left side of the second slider 13. By sliding the first slider 12 back and forth, and coordinating with the sliding of the second slider 13 up and down, the coaxial positioning part disposed on the left end of the second slider 13 is moved to be concentric with the bushing 6.

[0024] In this embodiment, the left end face of the fixed base 11 is provided with a first slide groove 14. The right end face of the first slider 12 is fixedly provided with a first slide rail 15 corresponding to the first slide groove 14. The right side of the front end of the first slide rail 15 is provided with a first return spring 16. The front end of the first return spring 16 is fixed to the circumference of the fixed base 11, and the rear end of the first return spring 16 is fixed to the rear end of the first slide rail 15 through a first spring seat 17. The left end face of the first slider 12 is provided with a second slide groove. The right end face of the second slider 13 is fixedly provided with a second slide rail 18 corresponding to the second slide groove. The right side of the upper end of the first slide rail 15 is provided with a second return spring 19. The lower end of the second return spring 19 is fixed to the circumference of the first slider 12, and the upper end of the first return spring 16 is fixed to the upper end of the second slide rail 18 through a second spring seat. The left end of the second slider 13 is coaxially provided with a coaxial positioning part. The coaxial positioning part is used to move the drive to be coaxial with the bushing 6. The first return spring 16 and the second return spring 19 are in a natural state.

[0025] In this invention, the coaxial positioning part includes a positioning cylinder 20 coaxially fixed to the left end of the second slider 13. Three sets of reversing parts are evenly arranged circumferentially on the left end of the positioning cylinder 20. Each reversing part has a supporting pressure head 21 and a pressure block 5 at its inner and outer ends, respectively. The reversing part is used so that when the pressure block 5 at the outer end moves to the right relative to the positioning cylinder 20, that is, while the pressure block 5 is pressing the bushing 6, the bushing 6 applies a rightward reaction force to the pressure block 5. The reaction force drives the pressure block 5 to move a set distance to the right. The supporting pressure head 21 corresponding to the pressure block 5... 1. The support head 21 moves to the left relative to the positioning cylinder 20, thereby moving to the inner hole of the bushing 6 to press and position the bushing 6; and when the inner end of the support head 21 moves to the right relative to the positioning cylinder 20, that is, when the support head 21 moves to contact the right end face of the valve cover shaft 4 and continues to move, the reaction force between the valve cover shaft 4 and the support head 21 drives the support head 21 to move to the right, and the corresponding support head 21 moves to the left relative to the positioning cylinder 20; thereby moving the bushing 6 to the right to the set position on the left side of the right end face of the valve cover shaft 4.

[0026] In use, the operator places the bushing 6 horizontally between the mounting hole through which the valve cover shaft 4 passes and the pressure block 5, and starts the pressure block drive unit. This causes the moving end of the extrusion cylinder 7 to drive the three sets of pressure blocks 5 and their corresponding support pressure heads 21 in the coaxial positioning unit to move towards the bushing 6. When the right end face of the bushing 6, located between the mounting hole through which the valve cover shaft 4 passes and the pressure block 5, contacts the left end face of each set of pressure blocks 5, the bushing 6 applies a reaction force to the right on the corresponding pressure block 5. This reaction force prevents each set of pressure blocks 5 from moving further to the left (each set of pressure blocks 5 moves to the right relative to the positioning cylinder 20). Under the action of the corresponding reversing part, the support pressure head 21 corresponding to each set of pressure blocks 5 moves to the left relative to the positioning cylinder 20, thereby moving the three sets of support pressure heads 21 into the inner hole of the bushing 6 to extrude and position the inner wall of the bushing 6. When the three sets of support pressure heads 21 move to the left, the support pressure head 21 moves to the left relative to the positioning cylinder 20. After the head 21 positions the bushing 6 by pressing the inner hole of the bushing 6, the three sets of pressure blocks 5 can no longer move to the right relative to the positioning cylinder 20. That is, the three sets of pressure blocks 5 are relatively stationary with the positioning cylinder 20. The three sets of pressure blocks 5 continue to move to the left until the bushing 6 is driven to the left and enters the mounting hole through which the valve cover shaft 4 passes. When the right end face of the valve cover shaft 4 is in contact with the left end face of the three sets of support pressure heads 21, the valve cover shaft 4 restricts the three sets of support pressure heads 21 from moving to the left. At the same time, the reaction force of the valve cover shaft 4 on the support pressure head 21 to the right causes the support pressure head 21 to drive the pressure block 5 to continue to move to the left through the reversing part until the right end of the valve cover shaft 4 protrudes from the bushing 6 by a set distance. This achieves three-point concentric positioning of the inner wall of the bushing 6 while the coaxial positioning part moves to the left. Then the bushing 6 is assembled so that the bushing 6 and the cylinder formed by the three sets of pressure heads are coaxial.

[0027] In this embodiment, the positioning cylinder 20 is circumferentially provided with three sets of receiving slots 22, and each set of receiving slots 22 is provided with a reversing part; each set of reversing parts includes a reversing gear 23 arranged radially along the positioning cylinder 20 and disposed in the corresponding receiving slot 22. Each set of reversing gears 23 is rotatably connected to the side wall of the corresponding positioning cylinder 20 through a gear shaft. A first rack 24 meshes with the outer side of each set of reversing gears 23, and a pressure block 5 is connected to the lower end of each set of first racks 24; a second rack 25 meshes with the inner side of each set of reversing gears 23, and a pressure block 5 is connected to the lower end of each set of second racks 25. The end is connected to the support head 21; in order to make each set of first racks 24 move horizontally left and right during the rotation of the reversing gear 23, the positioning cylinder 20 is coaxially fixedly sleeved with a guide cylinder 48. The guide cylinder 48 is evenly provided with three sets of guide grooves 26 corresponding to the receiving through groove 22. Each set of guide grooves 26 is slidably arranged with an outer positioning block 27 in the left and right. The inner end of the outer positioning block 27 is fixedly connected to the first rack 24. In order to make the three sets of support heads 21 on the inner side move synchronously, the inner sides of the three sets of second racks 25 are fixedly connected to each other through the inner positioning block 28.

[0028] In this embodiment, the outer surface of each set of support pressure heads 21 is a conical surface and the maximum circumferential diameter formed by the three sets of support pressure heads 21 is greater than the diameter of the corresponding bushing 6. The inner end face of each set of pressure blocks 5 is provided with an arc surface, and the arc surface is corresponding to the arc inner wall of the bushing 6.

[0029] To ensure that the inner end face of the pressure block 5 corresponds precisely to the arc-shaped inner wall of the bushing 6, in this embodiment, a T-slot 29 is provided on the right end face of each pressure block 5, and a T-block 30 corresponding to the T-slot 29 is fixedly provided at the lower end of the first rack 24. The T-block 30 slides along the inside and outside of the T-slot 29, and a first positioning spring 31 is provided at the outer end of the T-block 30. The inner end of the first positioning spring 31 is connected to the T-block 30, and the outer end of the first positioning spring 31 is fixed to the outer end of the pressure block 5 through the baffle 32. The first positioning spring 31 is in a compressed state; so that each As the support head 21 moves to the right, it can drive the corresponding pressure block 5 to move outward until the inner end face of the pressure block 5 corresponds to the inner arc of the bushing 6. The left end face of each pressure block 5 is a slope at a set angle, so that after the left end face of the pressure block 5 contacts the bushing 6, it cannot be driven to move inward by the first positioning spring 31. A second positioning spring 33 is provided on the upper end of each outer positioning block 27. The upper, lower, left and right ends of the second positioning spring 33 fix the right end of the outer positioning block 27 and the right side face of the guide groove 26, respectively. The second positioning spring 33 is in a natural state.

[0030] In use, when the right end face of the valve cover shaft 4 is at the left end of the bushing 6 (the operator places the bushing 6 horizontally between the mounting hole through which the valve cover shaft 4 passes and the pressure block 5), under the elastic force of the first positioning spring 31, the inner end of the pressure block 5 presses against the outer side of the support pressure head 21; the moving end of the extrusion cylinder 7 drives the three sets of pressure blocks 5 and the corresponding support pressure heads 21 in the coaxial positioning part to move towards the bushing 6. When the right end face of the bushing 6, which is between the mounting hole through which the valve cover shaft 4 passes and the pressure block 5, contacts the left end face of each set of pressure blocks 5, the bushing 6 applies a reaction force to the right on the corresponding pressure block 5. The reaction force prevents each set of pressure blocks 5 from moving further to the left (each set of pressure blocks 5 moves to the right relative to the positioning cylinder 20). Under the action of the corresponding reversing part, the support pressure head 21 corresponding to each set of pressure blocks 5 moves to the left relative to the positioning cylinder 20. The outer conical surface of each set of support pressure heads 21 drives the corresponding pressure block 5 to slide outward until the three The support pressure head 21 moves to the inner hole of the bushing 6 to press and position the inner wall of the bushing 6; at this time, the inner end face of each pressure block 5 moves to a position corresponding to the inner wall of the bushing 6; when the right end face of the valve cover shaft 4 is in contact with the left end face of the three support pressure heads 21, the valve cover shaft 4 restricts the three support pressure heads 21 from moving to the left. At the same time, the reaction force of the valve cover shaft 4 on the support pressure head 21 to the right causes the support pressure head 21 to drive the pressure block 5 to continue to move to the left through the reversing part. At this time, the inner side of each pressure block 5 disengages from the outer conical surface of the corresponding support pressure head 21. Since the left end face of each pressure block 5 is a slope at a set angle, the left end face of the pressure block 5 cannot be driven to move inward by the first positioning spring 31 after contacting the bushing 6; thus, each pressure block 5 maintains the set position and continues to move to the left until the right end of the valve cover shaft 4 protrudes from the bushing 6 by a set distance, realizing that while the coaxial positioning part moves to the left, it performs three-point concentric positioning relative to the inner wall of the bushing 6.

[0031] In this embodiment, the volute assembly positioning device 2 includes a limiting part coaxially disposed in the circular inner cavity of the volute, and a cylindrical processing platform 34 coaxially disposed below the limiting part; the limiting part is used to limit the inner cavity of the volute and the processing platform 34 to be coaxially positioned; when the pressure block 5 is pressing the bushing 6, it is equivalent to applying a torque to the volute assembly. In order to limit the rotation of the volute assembly, a limiting block 47 is provided on the side of the volute assembly near the mounting hole through which the valve cover shaft 4 passes, and the limiting block 47 is in close contact with the end face of the flange 35 on the lower side of the volute assembly.

[0032] The existing mounting hole through which the valve cover shaft 4 passes is set on the planar boss 38 (curved surfaces are generally not easy to drill holes or machine holes); in order to further restrict the rotation of the volute assembly; in this embodiment, an auxiliary limiting part is provided on the lower right side of the planar boss 38. The auxiliary limiting part includes a limiting block 36 fixedly set on the left end face of the moving plate 10. The limiting block 36 is fitted with a limiting sleeve 37 with an opening at the right end. A compression spring 41 is provided in the inner cavity of the limiting block 36. The compression spring 41 is in a natural state. The left and right ends of the compression spring 41 are respectively fixed to the bottom surface of the inner cavity of the limiting sleeve 37 and the end face of the limiting block 36. The left end face of the limiting sleeve 37 extends to contact the planar boss 38.

[0033] To facilitate batch processing and allow operators to easily manipulate the positioning volute assembly, in this embodiment, the limiting part includes a movable cylinder 39 and a rotating cylinder 40 coaxially arranged at their upper and lower ends. The rotating cylinder 40 is rotatably connected to the processing platform 34 at its lower end. A sliding rod 42 is coaxially fixed at the upper end of the rotating cylinder 40. The sliding rod 42 passes through the movable cylinder 39 and is slidably connected to the movable cylinder 39. The movable cylinder 39 and the rotating cylinder 40 are evenly provided with three sets of upper positioning grooves and three sets of lower positioning grooves in their circumferences. An upper support rod 43 and a lower support rod 44 are hinged in each set of upper positioning grooves and each set of lower positioning grooves, respectively. The outer ends of each set of upper support rods 43 and the corresponding lower support rods 44 are hinged through a connecting shaft. A driving cylinder 45 is provided at the upper end of the movable cylinder 39. The fixed end of the driving cylinder 45 is fixed to the worktable 1. The movable end of the driving cylinder 45 is fixed with a relief sleeve 46 corresponding to the movable cylinder 39. The lower end and opening of the relief sleeve 46 are corresponding to the upper end of the sliding rod 42.

[0034] In this embodiment, guide wheels are provided at both ends of the connecting shaft, and an ejector spring is provided between the moving cylinder 39 and the rotating cylinder 40. The ejector spring is always in a compressed state.

[0035] In use, when the movable end of the drive cylinder 45 is at the top dead center, the operator places the volute assembly with the limiting part on the processing platform 34, while aligning the left end face of the limiting sleeve 37 with the planar boss 38, and the limiting block 47 with the end face of the flange 35 on the lower side of the volute assembly. The drive cylinder 45 is then activated, causing the movable end of the drive cylinder 45 to drive the moving cylinder 39 downward. The angles of the three sets of upper support rods 43 and three sets of lower support rods 44, which are respectively hinged to the moving cylinder 39 and the rotating cylinder 40, change until the outer ends of the three sets of upper support rods 43 and three sets of lower support rods 44 press against the circumference of the inner cavity of the volute assembly, thus positioning the volute assembly coaxially with the processing platform 34. When the pressure block 5 presses the bushing 6 to the left, the limiting block 36 in the auxiliary limiting part moves downward and drives the limiting sleeve 37 through the compression spring 41, so that the limiting block 47 is tightly attached to the end face of the flange 35 on the lower side of the volute assembly, completing the rapid positioning of the volute assembly.

Claims

1. A bushing pressing device with self-centering function, characterized in that: The device includes a horizontal worktable. A volute assembly positioning device is vertically installed on one side of the upper surface of the worktable. The volute assembly positioning device is used to horizontally fix the volute assembly on the upper surface of the worktable. The mounting hole of the valve cover shaft in the volute assembly is correspondingly set with the bushing extrusion device. A horizontal bushing extrusion device is installed on the other side of the upper surface of the worktable. The bushing extrusion device includes a pressure block drive unit. The fixed end of the pressure block drive unit is fixedly connected to the worktable. The movable end of the pressure block drive unit is set with the mounting hole of the valve cover shaft corresponding to the fixed end of the valve cover shaft. The movable end of the pressure block drive unit is connected to the pressure block through a floating extrusion structure. The floating extrusion structure is used to make the pressure block and the bushing coaxial. The pressure block drive unit is used to drive the pressure block to move left and right.

2. The bushing pressing equipment with self-centering function according to claim 1, characterized in that: The press block drive unit includes a horizontally arranged extrusion cylinder. The fixed end of the extrusion cylinder is fixedly set to the right side of the upper surface of the workbench through a vertical positioning plate. Guide rods are horizontally fixed at both ends of the positioning plate. A moving plate is slidably set in the middle of the guide rods. The moving end of the extrusion cylinder is fixedly connected to the right end of the moving plate. A floating extrusion structure is set at the position of the mounting hole through which the valve cover shaft passes on the left end of the moving plate.

3. The bushing pressing equipment with self-centering function according to claim 2, characterized in that: The floating extrusion structure includes a floating part connected to the middle of the left end face of the moving plate and a coaxial positioning part disposed on the left side of the floating part. The floating part includes a cylindrical fixed seat fixedly connected to the left end face of the moving plate. A first slider is slidably disposed on the left side of the fixed seat, and a second slider is slidably disposed on the left side of the first slider. A coaxial positioning part is coaxially disposed on the left side of the second slider.

4. The bushing pressing equipment with self-centering function according to claim 3, characterized in that: The fixed base has first sliding grooves on the front and back of its left end face. A first slide rail is fixedly installed on the right end face of the first slider at a position corresponding to the first sliding groove. A first return spring is installed on the right side of the front end of the first slide rail. The front end of the first return spring is fixed to the circumference of the fixed base, and the rear end of the first return spring is fixed to the rear end of the first slide rail through a first spring seat. The left end face of the first slider has second sliding grooves on the front and back. A second slide rail is fixedly installed on the right end face of the second slider at a position corresponding to the second sliding groove. A second return spring is installed on the right side of the upper end of the first slide rail. The lower end of the second return spring is fixed to the circumference of the first slider, and the upper end of the first return spring is fixed to the upper end of the second slide rail through a second spring seat. A coaxial positioning part is coaxially installed on the left end of the second slider. The coaxial positioning part is used to move the drive to be coaxial with the bushing. The first return spring and the second return spring are in their natural state.

5. The bushing pressing equipment with self-centering function according to claim 4, characterized in that: The coaxial positioning part includes a positioning cylinder coaxially fixed to the left end of the second slider. Three sets of reversing parts are evenly arranged circumferentially on the left end of the positioning cylinder. Each set of reversing parts has a supporting pressure head and a pressure block at its inner and outer ends, respectively. When the pressure block at the outer end moves to the right relative to the positioning cylinder, the bushing applies a rightward reaction force to the pressure block. When the supporting pressure head at the inner end moves to the right relative to the positioning cylinder, the reaction force between the valve cover shaft and the supporting pressure head drives the supporting pressure head to move to the right.

6. The bushing pressing equipment with self-centering function according to claim 5, characterized in that: The positioning cylinder is provided with three sets of accommodating slots evenly distributed around its circumference. Each set of accommodating slots is provided with a reversing part. Each set of reversing parts includes a reversing gear arranged radially along the positioning cylinder and located in the corresponding accommodating slot. Each set of reversing gears is rotatably connected to the side wall of the corresponding positioning cylinder through a gear shaft. A first rack meshes with the outer side of each set of reversing gears, and a pressure block is connected to the lower end of each set of first racks. A second rack meshes with the inner side of each set of reversing gears, and a support pressure head is connected to the lower end of each set of second racks. A guide cylinder is coaxially fixedly sleeved on the outside of the positioning cylinder. The guide cylinder is provided with three sets of guide slots evenly distributed around its circumference, corresponding to the accommodating slots. An outer positioning block is slidably arranged left and right in each set of guide slots. The inner end of the outer positioning block is fixedly connected to the first rack. The inner sides of the three sets of second racks are fixedly connected to each other through the inner positioning blocks.

7. The bushing pressing equipment with self-centering function according to claim 6, characterized in that: Each set of support pressure heads has a conical outer surface, and the maximum circumferential diameter formed by the three sets of support pressure heads is greater than the corresponding bushing diameter. The inner end face of each set of pressure blocks is provided with an arc surface, and the arc surface is provided in correspondence with the arc inner wall of the bushing.

8. The bushing pressing equipment with self-centering function according to claim 1, characterized in that: Each set of pressure blocks has a T-slot on its right end face, and a T-block corresponding to the T-slot is fixedly installed at the lower end of the first rack. The T-block slides along the inside and outside of the T-slot. A first positioning spring is installed at the outer end of the T-block. The inner end of the first positioning spring is connected to the T-block, and the outer end of the first positioning spring is fixed to the outer end of the pressure block through a baffle. The first positioning spring is in a compressed state. The left end face of each set of pressure blocks is an inclined surface at a set angle. A second positioning spring is installed at the upper end of each set of outer positioning blocks. The upper, lower, left, and right ends of the second positioning spring are fixed to the right end of the outer positioning block and the right side face of the guide groove, respectively. The second positioning spring is in a natural state.

9. The bushing pressing equipment with self-centering function according to claim 1, characterized in that: The aforementioned volute assembly positioning device includes a limiting part coaxially disposed in the circular inner cavity of the volute, and a cylindrical machining platform coaxially disposed below the limiting part; the limiting part is used to limit the inner cavity of the volute and the machining platform coaxially; a limiting block is provided on the side of the volute assembly near the mounting hole through which the valve cover shaft passes, and the limiting block is in close contact with the flange end face on the lower side of the volute assembly.

10. The bushing pressing equipment with self-centering function according to claim 1, characterized in that: An auxiliary limiting part is provided on the lower right side of the planar boss. The auxiliary limiting part includes a limiting block fixedly installed on the left end face of the moving plate. The limiting block is covered with a limiting sleeve with an opening at the right end. A compression spring is provided in the inner cavity of the limiting block. The compression spring is in a natural state. The left and right ends of the compression spring are respectively fixed to the bottom surface of the inner cavity of the limiting sleeve and the end face of the limiting block. The left end face of the limiting sleeve extends to contact the planar boss.

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