Large-length-diameter-ratio piston rod grinding anti-vibration tool

Abstract

The large-length-diameter-ratio piston rod grinding anti-vibration tool comprises a base plate, a mounting frame is arranged in the base plate, and a guide rail is arranged on the mounting frame in the length direction of the mounting frame; the clamping unit comprises a fixed clamping piece and a movable clamping piece; the fixed clamping piece is arranged at one end of the mounting frame, and the movable clamping piece is assembled on the guide rail in a sliding mode and can be close to or away from the fixed clamping piece along the guide rail. A driving piece for driving the rod body to rotate is arranged on the fixed clamping piece; the supporting unit comprises a mounting piece adjustably arranged between the fixed clamping piece and the movable clamping piece and two sets of supporting rollers adjustably arranged on the mounting piece, and the two supporting rollers are both arranged on the lower side of the rod body and both abut against the rod body in a rolling mode; the position of the supporting unit can be flexibly adjusted along the stroke frame, the easily-vibrating section of the piston rod can be emphatically lifted and supported, the supporting roller is of an elastic floating structure, vibration in the grinding process can be effectively absorbed, and vibration marks and deformation of a workpiece are avoided.

Description

Technical Field

[0001] This invention relates to the field of machining tooling technology, specifically to a vibration damping tooling for grinding piston rods with a large length-to-diameter ratio. Background Technology

[0002] As a key transmission component in hydraulic cylinders, engineering machinery, and heavy equipment, the grinding accuracy of the outer diameter of the piston rod with a large length-to-diameter ratio directly determines the assembly accuracy, sealing performance, and service life of the product.

[0003] Because these workpieces have a large length-to-diameter ratio and relatively weak rigidity, they are prone to significant flexural deformation and high-frequency vibration during high-speed rotation and external cylindrical grinding under the influence of grinding force, centrifugal force, and transmission disturbances. This leads to problems such as vibration marks, out-of-tolerance roundness, poor cylindricity, and accelerated grinding wheel wear on the workpiece surface. Traditional grinding support methods often use clamping at both ends with simple brackets, which have drawbacks such as difficulty in dynamically adjusting the support height and force, inability to adapt to the gradually decreasing piston rod diameter during grinding, poor vibration damping, low clamping and support positioning accuracy, and non-adjustable intermediate support position and spacing. These shortcomings make it difficult to meet the machining requirements of high-precision long-shaft piston rods. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a vibration-damping fixture for grinding piston rods with large length-to-diameter ratios. This fixture solves the problems of conventional fixtures in the prior art, such as the difficulty in dynamically adjusting the support height and support force, and the inability to adjust the position and spacing of intermediate supports, which makes it difficult to meet the processing requirements of high-precision long-shaft piston rods.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a vibration damping fixture for grinding piston rods with a large length-to-diameter ratio, comprising a chassis, a mounting frame disposed inside the chassis, and a guide rail disposed on the mounting frame along its length direction;

[0006] The clamping unit includes a fixed clamping component and a movable clamping component; the fixed clamping component is located at one end of the mounting frame, and the movable clamping component is slidably mounted on the guide rail and can move closer to or away from the fixed clamping component along the guide rail; the fixed clamping component is provided with a driving component for driving the rod to rotate; the fixed clamping component and the movable clamping component are used to clamp the two ends of the rod respectively.

[0007] The support unit includes an installation component that is adjustable between the fixed clamping component and the movable clamping component, and two sets of support rollers that are adjustable on the installation component. Both support rollers are located on the lower side of the rod body and roll against the rod body.

[0008] Preferably, the fixing clamp includes a fixing frame disposed at one end of the guide rail, and a first support disposed on the fixing frame, wherein a first chuck is rotatably disposed on the first support.

[0009] Preferably, the driving component includes a driving source mounted on a fixed frame, and the output end of the driving source is engaged with one end of the first chuck via a transmission belt.

[0010] Preferably, the movable clamping component includes a movable frame and a second support mounted on the movable frame; a second chuck is rotatably mounted on the side of the second support facing the first chuck; rollers are rotatably mounted at the four corners of the bottom side of the movable frame, and each roller is supported on a guide rail.

[0011] Preferably, the mounting frame is provided with a travel frame along its length, and the travel frame passes through the movable frame; the movable frame is threadedly connected with a limit bolt, and the limit bolt abuts against the travel frame.

[0012] Preferably, the mounting component includes at least one set of limiting shafts, two sets of retaining seats passing through the limiting shafts, a bidirectional screw threaded to the two retaining seats, and a base; both retaining seats have retaining grooves on their bottom sides and are engaged with the travel frame through the retaining grooves; the tops of the two retaining seats are respectively hinged with adjusting arms, and the ends of the two adjusting arms away from the corresponding retaining seats are respectively hinged to the base; at least one retaining seat is threaded with a fastening bolt, and the fastening bolt abuts against the travel frame.

[0013] Preferably, the base is provided with a column, and a Y-shaped seat is fitted on the top of the column. Both support rollers are rotatably mounted on the Y-shaped seat. A compression spring is provided inside the column, and one end of the compression spring abuts against the Y-shaped seat. Under the elastic force of the compression spring, the two support rollers roll against the rod.

[0014] Preferably, two limiting grooves are mirror-imagely formed on the periphery of the column along its length; a limiting block is mirror-imagely formed at one end of the Y-shaped seat located inside the column, and each limiting block is respectively set in the limiting groove.

[0015] Preferably, an adjusting column is slidably provided inside the column, the adjusting column is located on the bottom side of the compression spring and abuts against the compression spring; a lead screw is rotatably provided inside the base, one end of the lead screw is threadedly connected to the adjusting column, and a worm wheel is provided at the end of the lead screw away from the adjusting column; a worm is also rotatably provided inside the base, and the worm meshes with the worm wheel.

[0016] Preferably, the travel frame is provided with a rack; the movable frame is provided with a rocker arm that rotates, and one end of the rocker arm is fixed with a gear that meshes with the rack.

[0017] Compared with existing technologies, this invention has the following advantages: The piston rod is centered, clamped, and rotated via the two-end clamping units, and reliably locked with limit bolts, effectively ensuring clamping stability. The support unit can be flexibly adjusted along the stroke frame, providing focused support for the easily vibrating sections of the piston rod. The spacing between the two sets of clamping seats can be adjusted synchronously via a bidirectional screw, thus adapting to the support requirements of piston rods with different diameters. The support roller adopts an elastic floating structure, maintaining stable rolling contact with the rod body under the action of a compression spring, effectively absorbing vibrations during grinding and preventing workpiece vibration marks and deformation. Simultaneously, the combination of the worm gear, lead screw, and adjusting column allows for stepless adjustment of the support height and spring preload, dynamically adapting to changes in the piston rod's outer diameter during grinding, ensuring continuous and stable support and vibration reduction. The overall device has a reasonable structure, is easy to adjust, highly versatile, and has a significant vibration reduction effect, greatly improving the grinding accuracy and processing efficiency of piston rods with large length-to-diameter ratios. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the chassis structure in an embodiment of the present invention.

[0020] Figure 3 This is a side view of an embodiment of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the movable clamping component in an embodiment of the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the support unit in an embodiment of the present invention.

[0023] Figure 6 This is a cross-sectional view of the support unit in an embodiment of the present invention.

[0024] The reference numerals in the accompanying drawings include:

[0025] 10. Chassis; 11. Rod;

[0026] 20. Mounting bracket; 21. Travel bracket; 22. Guide rail; 24. Rack and pinion;

[0027] 30. First support; 31. First chuck; 32. Drive belt; 33. Drive source; 34. Fixture;

[0028] 40. Second support; 41. Movable frame; 42. Roller; 43. Gear; 44. Rocker arm; 45. Limit bolt; 46. Second chuck;

[0029] 60. Card holder; 61. Card slot; 62. Limiting shaft; 63. Double-acting screw; 64. Fastening bolt;

[0030] 70. Column; 71. Limiting groove; 72. Adjusting column; 73. Base; 74. Adjusting arm;

[0031] 80. Y-shaped seat; 81. Support roller; 83. Limiting block; 84. Compression spring;

[0032] 90. Lead screw; 91. Worm gear; 92. Worm. Detailed Implementation

[0033] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] like Figures 1 to 6 As shown in the figure, this embodiment of the invention proposes a vibration-damping fixture for grinding piston rods with a large length-to-diameter ratio. It includes a chassis 10, a mounting frame 20 is provided inside the chassis 10, and a guide rail 22 is provided on the mounting frame 20 along its length direction. The chassis 10 serves as the basic load-bearing component of the fixture and is mainly used to receive the coolant flowing down from the processing area during the grinding process. It can centrally collect and guide the coolant, effectively preventing the coolant from splashing and flowing onto the workbench and surrounding ground, preventing problems such as a slippery working environment and pollution caused by coolant spillage. At the same time, it facilitates the subsequent recycling and cleaning of the coolant, keeping the processing site clean and safe, and improving the standardization and practicality of the overall working environment.

[0035] The clamping unit includes a fixed clamping component and a movable clamping component. The fixed clamping component is located at one end of the mounting bracket 20, and the movable clamping component is slidably mounted on the guide rail 22, moving closer to or further away from the fixed clamping component along the guide rail 22. The fixed clamping component is equipped with a driving component for rotating the rod 11. The fixed clamping component and the movable clamping component are used to clamp the two ends of the rod 11 respectively. Through the structure combining clamping at both ends and support in the middle, the overall rigidity of the piston rod with a large length-to-diameter ratio can be effectively enhanced during the grinding process, significantly suppressing vibration and deflection deformation generated during machining, thereby improving the grinding accuracy and surface quality of the piston rod's outer diameter. The movable clamping component can slide and adjust along the guide rail 22, adapting to the clamping of piston rods of different lengths, thus improving the applicability and versatility of the tooling.

[0036] The support unit includes an adjustable mounting component positioned between the fixed clamping component and the movable clamping component, and two sets of adjustable support rollers 81 mounted on the mounting component. Both support rollers 81 are located on the underside of the rod 11 and roll against the rod 11. The position and structure of the support unit are adjustable, allowing for precise support of easily vibrating parts of the piston rod, resulting in more stable and reliable vibration reduction. The rolling contact between the support rollers 81 and the rod 11 ensures stable support while reducing frictional resistance, without affecting the normal rotation and processing of the rod 11. The overall structure is simple and easy to adjust, effectively improving processing efficiency and finished product yield.

[0037] In the embodiments, rod 11 generally refers to piston rods with a large length-to-diameter ratio and slender shaft-like workpieces to be processed.

[0038] like Figures 1 to 4 As shown, the fixed clamping component includes a fixed frame 34 located at one end of the guide rail 22, and a first support 30 located on the fixed frame 34. A first chuck 31 is rotatably mounted on the first support 30. The fixed clamping component adopts a combination structure of the fixed frame 34, the first support 30, and the first chuck 31. The first chuck 31 is rotatably mounted on the first support 30, which can achieve stable centering and reliable clamping of the piston rod end, while providing stable support for the rotation of the piston rod, ensuring smooth rotation and high coaxiality of the piston rod during grinding, thereby improving machining accuracy.

[0039] like Figure 1 As shown, the driving component includes a driving source 33 mounted on a fixed frame 34. The output end of the driving source 33 is connected to one end of the first chuck 31 via a transmission belt 32. The driving source 33, in conjunction with the transmission belt 32, drives the first chuck 31 to rotate, which in turn drives the clamped rod 11 to rotate. The transmission belt 32 has a simple structure, is easy to install and maintain, and provides stable and reliable power transmission, ensuring uniform rotation of the piston rod and providing stable rotational power support for high-precision grinding.

[0040] In this embodiment, the drive source 33 preferably uses a motor as the power output component. In other embodiments, other equivalent drive devices can be flexibly selected according to the actual working conditions and usage requirements.

[0041] like Figure 3As shown, the movable clamping component includes a movable frame 41 and a second support 40 mounted on the movable frame 41; a second chuck 46 is rotatably mounted on the side of the second support 40 facing the first chuck 31; rollers 42 are rotatably mounted at the four corners of the bottom side of the movable frame 41, and each roller 42 is supported on the guide rail 22. By setting up the movable frame 41, the second support 40, and the second chuck 46, and cooperating with the rollers 42 on the guide rail 22 for support, the movable clamping component can slide flexibly and smoothly. The design of the four corner rollers 42 makes the movable clamping component run stably on the guide rail 22 and maintain a balanced center of gravity, effectively avoiding deviation and jamming, and ensuring that the piston rod remains accurately aligned during clamping and adjustment.

[0042] like Figure 3 As shown, a travel bracket 21 is provided on the mounting frame 20 along its length, and the travel bracket 21 passes through the movable frame 41; a limit bolt 45 is threadedly connected to the movable frame 41, and the limit bolt 45 abuts against the travel bracket 21. By setting the travel bracket 21 on the mounting frame 20 and passing the travel bracket 21 through the movable frame 41, and locking it with the limit bolt 45, the movement of the movable frame 41 can be guided and limited, ensuring that the movable frame 41 moves smoothly in the set direction, improving the motion accuracy and coaxiality of the moving clamping parts, and also achieving fast and reliable position locking after clamping, preventing the movable frame 41 from moving during processing, further improving the stability of piston rod clamping and the reliability of the grinding process.

[0043] like Figure 5 As shown, the mounting components include at least one set of limiting shafts 62, two sets of retaining seats 60 passing through the limiting shafts 62, a bidirectional screw 63 threadedly connected to the two retaining seats 60, and a base 73; both retaining seats 60 have retaining grooves 61 on their bottom sides, and are engaged with the travel frame 21 through the retaining grooves 61; the tops of the two retaining seats 60 are respectively hinged with adjusting arms 74, and the ends of the two adjusting arms 74 away from the corresponding retaining seats 60 are respectively hinged to the base 73; at least one retaining seat 60 is threadedly connected with a fastening bolt 64, and the fastening bolt 64 abuts against the travel frame 21.

[0044] The structure, consisting of a limiting shaft 62, a bidirectional screw 63, a retaining seat 60, and an adjusting arm 74, enables rapid positioning and spacing adjustment of the support unit on the stroke frame 21. This allows for adaptation to the support requirements of piston rods of different diameters, with convenient adjustment and good synchronization. The retaining seat 60 engages with the stroke frame 21 via a slot 61 and is reliably locked in place with a fastening bolt 64, ensuring accurate positioning and preventing loosening. The adjusting arm 74 is hinged to the retaining seat 60 and the base 73, allowing for adaptive adjustment of the support angle and height, further improving the stability and adaptability of the support, thereby ensuring effective lifting and vibration damping of the piston rod.

[0045] During adjustment, rotating the bidirectional screw 63 can drive the two sets of card holders 60 to move closer or further apart synchronously along the limiting shaft 62; when the two sets of card holders 60 move closer together, the base 73 is raised by the adjusting arm 74; when the two sets of card holders 60 move further apart, the base 73 is lowered by the adjusting arm 74, thereby adjusting the distance between the base 73 and the rod 11 by changing the distance between the two sets of card holders 60.

[0046] like Figure 5 As shown, a column 70 is provided on the base 73, and a Y-shaped seat 80 is fitted on the top of the column 70. Both support rollers 81 are rotatably mounted on the Y-shaped seat 80. A compression spring 84 is provided inside the column 70, with one end of the compression spring 84 abutting against the Y-shaped seat 80. Under the elastic force of the compression spring 84, the two support rollers 81 roll against the rod 11. The elastic support structure of the column 70, Y-shaped seat 80 and compression spring 84 can ensure that the support rollers 81 maintain stable rolling contact with the rod 11 under the elastic force of the compression spring 84. This can effectively absorb the vibration generated during grinding, suppress piston rod vibration and deformation, and adaptively match the changes in the outer diameter of the piston rod, ensuring a continuous and reliable support effect.

[0047] like Figure 5 As shown, two limiting grooves 71 are mirror-imagely formed on the periphery of the column 70 along its length; a limiting block 83 is mirror-imagely formed on one end of the Y-shaped seat 80 located inside the column 70, with each limiting block 83 corresponding to a limiting groove 71. By forming limiting grooves 71 on the column 70 and setting limiting blocks 83 on the Y-shaped seat 80 that cooperate with the limiting grooves 71, the lifting and lowering movement of the Y-shaped seat 80 can be precisely guided and circumferentially limited, preventing the Y-shaped seat 80 from rotating or tilting during lifting, or even being pushed out of the column 70 by the compression spring 84, ensuring that the support roller 81 is always stably aligned with the piston rod.

[0048] like Figure 6 As shown, an adjusting column 72 is slidably installed inside the column 70, located on the bottom side of the compression spring 84 and abutting against it. A lead screw 90 is rotatably installed inside the base 73, one end of which is threadedly connected to the adjusting column 72, and a worm gear 91 is installed at the end of the lead screw 90 away from the adjusting column 72. A worm 92 is also rotatably installed inside the base 73, meshing with the worm gear 91. This adjusting structure, using the adjusting column 72, lead screw 90, worm gear 91, and worm 92, allows for stepless and precise adjustment of the preload of the compression spring 84, thereby flexibly controlling the support force and height of the support roller 81 on the piston rod. This adapts to the processing requirements of piston rods of different specifications, ensuring effective support between the support roller 81 and the piston rod. The transmission between the worm gear 91 and the worm 92 has a self-locking characteristic, ensuring stable and secure positioning after adjustment and preventing deviation of support parameters during processing.

[0049] like Figure 3As shown, the travel frame 21 is equipped with a rack 24; the movable frame 41 is rotatably equipped with a rocker arm 44, one end of which is fixed with a gear 43, which meshes with the rack 24. This transmission structure, with the gear 43 meshing with the rack 24, combined with the rocker arm 44, enables manual adjustment of the movable frame 41. The transmission is smooth, precise, and easy to operate, allowing for accurate displacement and fine-tuning of the moving clamping components, ensuring coaxiality and alignment of the piston rod during clamping. This transmission structure is highly reliable, less prone to slippage, and effectively improves clamping efficiency and positioning accuracy, providing a stable and reliable clamping foundation for grinding processes.

[0050] The implementation principle of this application embodiment is as follows: In use, firstly, according to the length of the piston rod, the rocker arm 44 is shaken to drive the movable frame 41 to move through the gear 43 and rack 24, respectively clamping the two ends of the piston rod between the first chuck 31 and the second chuck 46. After completion, the limiting bolt 45 is tightened to position and lock the movable frame 41. Then, according to the processing position of the piston rod, the support unit is adjusted to a suitable area along the stroke frame 21, and the fastening bolt 64 is tightened to fix the chuck 60. Subsequently, the bidirectional screw 63 is rotated, and the base 73 is raised and lowered through the adjusting arm 74 to complete the coarse adjustment of the support height; then, the worm 92 is rotated, and the adjusting column 72 is driven to move through the worm wheel 91 and the lead screw 90, changing the preload of the compression spring 84 to achieve fine adjustment of the support force and support height, so that the support roller 81 rolls stably against the piston rod under the action of elasticity. Finally, the drive source 33 is started to drive the piston rod to rotate, and grinding can be performed.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A vibration damping fixture for grinding piston rods with a large length-to-diameter ratio, characterized in that, include: A chassis (10) is provided with a mounting frame (20) inside the chassis (10), and a guide rail (22) is provided on the mounting frame (20) along its length direction. The clamping unit includes a fixed clamping member and a movable clamping member; the fixed clamping member is disposed at one end of the mounting bracket (20), and the movable clamping member is slidably mounted on the guide rail (22) and can move closer to or away from the fixed clamping member along the guide rail (22); the fixed clamping member is provided with a driving member for driving the rod (11) to rotate; the fixed clamping member and the movable clamping member are used to clamp the two ends of the rod (11) respectively; The support unit includes an installation component that is adjustable between the fixed clamping component and the movable clamping component, and two sets of support rollers (81) that are adjustable on the installation component. Both support rollers (81) are located on the lower side of the rod (11), and both support rollers (81) roll against the rod (11).

2. The anti-vibration fixture for grinding piston rods with a large length-to-diameter ratio according to claim 1, characterized in that, The fixed clamping member includes a fixed frame (34) disposed at one end of the guide rail (22) and a first support (30) disposed on the fixed frame (34), and a first chuck (31) is rotatably disposed on the first support (30).

3. The anti-vibration fixture for grinding piston rods with a large length-to-diameter ratio according to claim 2, characterized in that, The driving component includes a driving source (33) mounted on the fixed frame (34), and the output end of the driving source (33) is connected to one end of the first chuck (31) via a transmission belt (32).

4. The anti-vibration fixture for grinding piston rods with a large length-to-diameter ratio according to claim 2, characterized in that, The movable clamping component includes a movable frame (41) and a second support (40) disposed on the movable frame (41); a second chuck (46) is rotatably disposed on the side of the second support (40) facing the first chuck (31); rollers (42) are rotatably disposed at the four corners of the bottom side of the movable frame (41), and each roller (42) is respectively supported on the guide rail (22).

5. The anti-vibration fixture for grinding piston rods with a large length-to-diameter ratio according to claim 4, characterized in that, The mounting bracket (20) is provided with a travel bracket (21) along its length direction, and the travel bracket (21) passes through the movable bracket (41); the movable bracket (41) is threaded with a limit bolt (45), and the limit bolt (45) abuts against the travel bracket (21).

6. The anti-vibration fixture for grinding piston rods with a large length-to-diameter ratio according to claim 5, characterized in that, The mounting component includes at least one set of limiting shafts (62), two sets of retainers (60) passing through the limiting shafts (62), a bidirectional screw (63) threadedly connected to the two retainers (60), and a base (73); both retainers (60) have slots (61) on their bottom sides and are engaged with the travel frame (21) through the slots (61); the tops of the two retainers (60) are respectively hinged with adjusting arms (74), and the ends of the two adjusting arms (74) away from the corresponding retainers (60) are respectively hinged to the base (73); at least one retainer (60) is threadedly connected with a fastening bolt (64), and the fastening bolt (64) abuts against the travel frame (21).

7. The anti-vibration fixture for grinding piston rods with a large length-to-diameter ratio according to claim 6, characterized in that, The base (73) is provided with a column (70), and a Y-shaped seat (80) is fitted on the top of the column (70). Two support rollers (81) are rotatably mounted on the Y-shaped seat (80). A compression spring (84) is provided inside the column (70). One end of the compression spring (84) abuts against the Y-shaped seat (80), and the two support rollers (81) roll against the rod (11) under the elastic force of the compression spring (84).

8. The anti-vibration fixture for grinding piston rods with a large length-to-diameter ratio according to claim 7, characterized in that, The column (70) has two limiting grooves (71) mirrored along its length on its periphery; the Y-shaped seat (80) is mirrored with a limiting block (83) at one end inside the column (70), and each limiting block (83) is respectively located in the limiting groove (71).

9. The anti-vibration fixture for grinding piston rods with a large length-to-diameter ratio according to claim 8, characterized in that, An adjusting column (72) is slidably provided inside the column (70). The adjusting column (72) is located on the bottom side of the compression spring (84) and abuts against the compression spring (84). A lead screw (90) is rotatably provided inside the base (73). One end of the lead screw (90) is threadedly connected to the adjusting column (72). A worm wheel (91) is provided at the end of the lead screw (90) away from the adjusting column (72). A worm (92) is also rotatably provided inside the base (73). The worm (92) meshes with the worm wheel (91).

10. The anti-vibration fixture for grinding piston rods with a large length-to-diameter ratio according to claim 5, characterized in that, The travel frame (21) is provided with a rack (24); the movable frame (41) is provided with a rocker arm (44) that rotates on it, and a gear (43) is fixed at one end of the rocker arm (44), and the gear (43) meshes with the rack (24).

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