Portable cylindrical rubber cushion chamfering clamp

Abstract

The utility model relates to a portable cylindrical rubber buffer pad chamfer processing clamp belongs to the field of rubber processing clamp, include: bottom plate, its surface is equipped with two parallel dovetail slide rails, adjustable platen, bottom surface is equipped with dovetail groove with dovetail slide rail cooperation, top surface fixed mounting hole seat and positioning vertical board, shaft connecting plate, lower end passes through the interference fit and is connected the hole seat, upper end installs handle, and the end face is equipped with the pin hole, U type connecting piece, both side plates are hinged with the pin hole of shaft connecting plate through butterfly positioning locking pin between, and the center line of top end shaft is 1.5 downward inclined angle with side plate shows, micro three -jaw chuck, through bearing installation in U type connecting piece's top end shaft, angle scale dial, fixed in the side of shaft connecting plate, be used for measuring the rotation angle of U type connecting piece, numerical scale dial, be equipped with the edge of bottom plate's upper end surface, be used for measuring adjustable platen's movement displacement. The utility model realizes the unity of " high universality + high precision " while simplifying the structure.

Description

Technical Field

[0001] This utility model belongs to the field of rubber processing fixtures, specifically relating to a convenient chamfering fixture for cylindrical rubber buffer pads. Background Technology

[0002] There are many types of cylindrical rubber cushioning pads, and these types are updated and replaced frequently, requiring frequent trial production. Under the traditional model, chamfering processing has long faced three major contradictions:

[0003] 1. The contradiction between diversified specifications and specialized fixtures

[0004] The products are updated quickly and come in many models (cylinders / frustums, etc.), with significant differences in chamfer angles (such as 30°, 45°, 60°) and dimensions (such as 2×45°, 5×60°).

[0005] Traditional solutions require custom-made fixtures for each product, with a cost of 1,000 to 3,000 yuan per set, accumulating to over 80,000 yuan annually. Moreover, the customization cycle can take as long as 20 to 30 days, severely hindering the delivery of new products.

[0006] 2. The contradiction between precision requirements and technological limitations

[0007] Existing general-purpose fixtures rely on manual clamping, and uneven clamping force causes parts to shift, resulting in chamfer roundness error of ±1.5mm, surface finish of only Ra3.2 (lower than the industry standard of Ra1.6), and a rework rate as high as 25%.

[0008] Angle / size adjustments require disassembling and reassembling pads or components, and a single adjustment takes more than 30 minutes. Furthermore, there are no scale markings, and the accuracy depends entirely on the worker's experience.

[0009] 3. The contradiction between security needs and lack of protection

[0010] Manually handling parts close to the sanding belt results in 1-2 scratch accidents per year; the fixtures lack automatic limit devices, and parts may not be firmly clamped, potentially causing them to fly and damage the equipment.

[0011] In summary, the root cause of the defects in the existing technology is:

[0012] Structural rigidity: Fixed clamps are not compatible with multiple specifications, and size / angle adjustments require physical replacement of parts.

[0013] Outdated transmission: Manual operation lacks quantitative feedback, making it impossible to guarantee batch consistency.

[0014] Power dependence: Since sand is not used to drive energy, an additional rotary drive mechanism is required, which increases complexity.

[0015] Protection deficiency: The mechanical movement trajectory is not subject to hard limits, and the risk of overload is uncontrollable. Summary of the Invention

[0016] The technical problem to be solved:

[0017] To avoid the shortcomings of existing technologies, this utility model provides a convenient chamfering fixture for cylindrical rubber buffer pads. It solves the problem of multi-specification adaptation through a two-way precision adjustment mechanism (angle / size linkage), and combines self-driven centering grinding (using sand to drive energy) to replace the external power source, achieving a unity of "high versatility + high precision" while simplifying the structure.

[0018] The technical solution of this utility model is: a convenient chamfering fixture for cylindrical rubber buffer pads, comprising:

[0019] The base plate 14 has two parallel dovetail slide rails 17 on its surface and adjustable fixing holes 15 with threads at the four corners.

[0020] The adjustable support plate 1 has a dovetail groove on the bottom surface that mates with the dovetail slide rail 17, and a fixed mounting hole seat 2 and a positioning upright plate 16 on the top surface.

[0021] The shaft connecting plate 3 has a lower end connected to the hole seat 2 via an interference fit, and a handle 5 is installed on the upper end. A pin hole is opened on the end face.

[0022] The U-shaped connector 9 is hinged to the pin hole of the shaft connecting plate 3 by the butterfly positioning locking pin 6 between the two side plates. A top shaft is provided on the outer side of the top end face. The center line of the top shaft is inclined downward at a 1.5° angle to the side plate.

[0023] A miniature three-jaw chuck 12 is mounted on the top shaft of the U-shaped connector 9 via a bearing 10, and three adjustment holes 11 are evenly distributed around the chuck.

[0024] Angle scale 7 is fixed to the side of the shaft connecting plate 3 and is used to measure the rotation angle of the U-shaped connector 9;

[0025] A numerical scale 18 is located at the edge of the upper end face of the base plate 14 and is used to measure the moving displacement of the adjustable support plate 1.

[0026] A further technical solution of this utility model is: the fit gap between the dovetail slide rail 17 and the dovetail groove is ≤0.05mm, the slide rail accuracy grade is H7, the length is 200mm and the spacing is 320mm.

[0027] A further technical solution of this utility model is: the U-shaped connector 9 and the shaft connecting plate 3 form a rotary pair, which, together with the angle scale 7, realizes continuous angle adjustment from 0° to 90°, with an adjustment error of ≤ ±0.5°; and a pointer window 8 is opened on the upper side plate of the U-shaped connector 9.

[0028] A further technical solution of this utility model is: the top shaft of the U-shaped connector 9 is tilted downward at a 1.5° angle, so that the axis of the clamped part forms a constant negative angle with the sanding belt plane.

[0029] A further technical solution of this utility model is: the adjustable support plate 1 moves along the dovetail slide rail 17, and cooperates with the numerical scale 18 to realize the chamfer size adjustment from 0 to 20 mm, with a repeatability positioning accuracy of ≤ ±0.2 mm.

[0030] A further technical solution of this utility model is: the positioning plate 16 is a vertical structure, and its inner side is tangent to the rotation trajectory of the shaft connecting plate 3, forming a mechanical hard limit.

[0031] A further technical solution of this utility model is: the jaw stroke of the miniature three-jaw chuck 12 is 5-30mm, which is compatible with cylindrical rubber parts of φ10-φ50mm.

[0032] A further technical solution of this utility model is: the center distance of the adjustment hole 11 is 25mm from the center of the chuck, which is compatible with an M6 hex wrench to achieve quick clamping.

[0033] A further technical solution of this utility model is: a locking bolt 4 is provided between the base plate 14 and the adjustable support plate 1 to fix the position after size adjustment.

[0034] A further technical solution of this utility model is: an elastic limiting post is added next to the positioning plate 16, which together with the positioning plate constitutes a double overload protection mechanism.

[0035] Beneficial effects

[0036] The beneficial effects of this utility model are as follows: This utility model, through a bidirectional linkage adjustment mechanism (angle continuously adjustable from 0° to 90° + precision control of dimensions from 0 to 20mm), is compatible with cylindrical rubber parts of all sizes from φ10 to 50mm, reducing the need for customized special fixtures by 90%; the specific effects are analyzed as follows:

[0037] 1. Self-driving chamfering principle: The U-shaped connector is designed with a 1.5° tilt angle, which uses the friction of the sanding belt to make the part rotate on its own. No additional power source is required, which simplifies the structure and improves the consistency of processing.

[0038] 2. Dual-scale precise adjustment: The angle scale and the numerical scale work together to achieve "angle to size" linkage control, meeting the needs of precision machining.

[0039] 3. Quick-change universal design: The combination of a three-jaw chuck and an adjustable tray covers parts from φ10 to φ50mm, reducing the clamp change frequency by 90%.

[0040] 4. Enhanced safety protection: Dual protection with positioning plate and elastic limit post to prevent overload and overtravel, in compliance with ISO12100 mechanical safety standards. Attached Figure Description

[0041] Figure 1 This is a three-dimensional structural diagram of the clamp structure of this utility model;

[0042] Figure 2 This is a schematic diagram of the internal structure of the main body of the device of this utility model;

[0043] Figure 3 This is a schematic diagram showing the installation of the miniature three-jaw chuck, bearing, butterfly positioning locking pin, and U-shaped connector of this utility model.

[0044] Figure 4 This is a schematic diagram showing the installation of the operating handle, shaft connecting plate, and angle scale of this utility model;

[0045] Figure 5 This utility model fixes the fixture body to the worktable of the belt grinder. When the belt rotates at high speed, the friction of the belt drives the part to rotate, realizing self-centering grinding without a power source, and realizing chamfering grinding of the part. This is a schematic diagram of the processing state.

[0046] Explanation of reference numerals in the attached drawings: 1. Adjustable support plate; 2. Hole seat; 3. Shaft connecting plate; 4. Locking bolt; 5. Handle; 6. Butterfly positioning locking pin; 7. Angle scale; 8. Pointer window; 9. U-shaped connector; 10. Bearing; 11. Three-jaw chuck adjustment hole; 12. Miniature three-jaw chuck; 13. Parts / products; 14. Base plate; 15. Adjustable fixing hole; 16. Positioning upright plate; 17. Dovetail slide rail; 18. Numerical scale. Detailed Implementation

[0047] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] Based on the existing technology's shortcomings, such as fixed fixtures being incompatible with multiple specifications, requiring physical replacement of parts for size / angle adjustments, lack of quantitative feedback in manual operation leading to inconsistent batch sizes, failure to utilize sand-driven energy necessitating additional rotary drive mechanisms, increasing complexity, and the absence of hard limits on mechanical motion trajectories resulting in uncontrollable overload risks, this utility model provides a convenient chamfering fixture for cylindrical rubber buffer pads, comprising:

[0050] The base plate 14 has two parallel dovetail slide rails 17 on its surface and adjustable fixing holes 15 with threads at the four corners.

[0051] The adjustable support plate 1 has a dovetail groove on the bottom surface that mates with the dovetail slide rail 17, and a fixed mounting hole seat 2 and a positioning upright plate 16 on the top surface.

[0052] The shaft connecting plate 3 has a lower end connected to the hole seat 2 via an interference fit, and a handle 5 is installed on the upper end. A pin hole is opened on the end face.

[0053] The U-shaped connector 9 is hinged to the pin hole of the shaft connecting plate 3 by the butterfly positioning locking pin 6 between the two side plates. A top shaft is provided on the outer side of the top end face. The center line of the top shaft is inclined downward at a 1.5° angle to the side plate.

[0054] A miniature three-jaw chuck 12 is mounted on the top shaft of the U-shaped connector 9 via a bearing 10, and three adjustment holes 11 are evenly distributed around the chuck.

[0055] Angle scale 7 is fixed to the side of the shaft connecting plate 3 and is used for the rotation of the U-shaped connector 9;

[0056] A numerical scale 18 is located at the edge of the upper end face of the base plate 14 and is used to measure the moving displacement of the adjustable support plate 1.

[0057] Specifically, the fit clearance between the dovetail slide rail 17 and the dovetail groove is ≤0.05mm, the slide rail accuracy grade is H7, the length is 200mm and the spacing is 320mm.

[0058] Specifically, the U-shaped connector 9 and the shaft connecting plate 3 form a rotary pair, which, together with the angle dial 7, enables continuous angle adjustment from 0° to 90° with an adjustment error of ≤ ±0.5°; and a pointer window 8 is provided on the upper side plate of the U-shaped connector 9.

[0059] Specifically, the 1.5° downward tilt angle of the top shaft of the U-shaped connector 9 makes the axis of the clamped part form a constant negative angle with the sanding belt plane.

[0060] Specifically, the adjustable support plate 1 moves along the dovetail slide rail 17 and, in conjunction with the numerical scale 18, achieves chamfer size adjustment from 0 to 20 mm, with a repeatability accuracy of ≤ ±0.2 mm.

[0061] Specifically, the positioning plate 16 is a vertical structure, and its inner side is tangent to the rotation trajectory of the shaft connecting plate 3, forming a mechanical hard limit.

[0062] Specifically, the miniature three-jaw chuck 12 has a jaw stroke of 5-30mm and is compatible with cylindrical rubber parts of φ10-φ50mm.

[0063] Specifically, the center of the adjustment hole 11 is 25mm from the center of the chuck, and it is compatible with an M6 hex wrench to achieve quick clamping.

[0064] Specifically, a locking bolt 4 is provided between the base plate 14 and the adjustable support plate 1 to fix the position after size adjustment.

[0065] Specifically, an elastic limiting post is added next to the positioning plate 16, which together with the positioning plate forms a dual overload protection mechanism.

[0066] The above technical solution will be further explained below with reference to examples and accompanying drawings:

[0067] In one embodiment, refer to Figures 1-5 As shown in the figure, the components of a convenient chamfering fixture for cylindrical rubber buffer pads in this embodiment are as follows:

[0068] Base plate 14: Made of 45# steel, serving as the basic support and mounting carrier. It has M8 threaded adjustable fixing holes at the four corners, and two dovetail slide rails (200mm in length and 320mm apart) with an accuracy grade of H7 are milled on its surface. A numerical scale 18 (minimum scale 0.2mm) is installed on the right side of its upper end face, with the reference zero position aligned with the left end face of the dovetail slide rail 17.

[0069] Adjustable support plate 1: Made of 45# steel, serving as the adjustment carrier for displacement. Two dovetail grooves are machined on the bottom surface, with a clearance ≤0.05mm between the plate and the dovetail slide rail. The top surface is equipped with a seat 2 and a positioning plate 16 (vertical structure, 80mm high). The inner diameter of the seat 2 is φ25mm. The inner side of the positioning plate 16 is tangent to the rotation trajectory of the shaft connecting plate 3 (tangency point 50mm from the rotation center). An elastic limiting post (spring steel, 5mm preload stroke) is added to the side of the adjustable support plate 1, spaced 10mm from the positioning plate 16.

[0070] Shaft connecting plate 3: Aluminum alloy 6061 is selected as the angle adjustment transmission component. The lower end is machined with a φ25mm shaft head (interference fit with hole seat 2), and the upper end is provided with an M10 threaded hole (for mounting handle 5). The end face is provided with a φ8mm pin hole (for connecting butterfly positioning locking pin).

[0071] U-shaped connector 9: Made of 40Cr, used as the angle adjustment actuator, with a 50mm gap between the two side plates, a top shaft diameter of φ12mm, and a 1.5° downward tilt angle; its top side plate has a pointer window 8.

[0072] Angle dial 6 is fixed to the side of shaft connecting plate 3, with the scale area aligned with the hollow pointer window 8 of U-shaped connector 9.

[0073] Miniature three-jaw chuck 12: Made of 304 stainless steel, serving as the core for part clamping. The chuck diameter is 80mm, the three-jaw stroke is 5-30mm, and three adjustment holes 11 are evenly distributed around the chuck's circumference. The center of each adjustment hole 11 is 25mm from the center of the chuck, and it is compatible with an M6 Allen wrench. It is mounted on the top shaft of the U-shaped connector 9 via a bearing 10.

[0074] The key mating relationships of the fixture components include:

[0075] Motion chain transmission: handle rotation → shaft connecting plate rotation → U-shaped connector angle adjustment (locked by butterfly positioning locking pin) → bearing drives miniature three-jaw chuck rotation → part completes chamfering with sanding belt rotation.

[0076] Limit protection mechanism: The positioning plate adopts a vertical structure and is tangent to the rotation trajectory of the shaft connecting plate. When the handle is rotated to the position of the vertical plate, the feed is forcibly stopped to avoid overload.

[0077] Performance parameters comparison between this embodiment and traditional fixtures

[0078]

[0079] In one embodiment, a typical processing flow for a convenient cylindrical rubber buffer pad chamfering fixture (taking a φ30mm rubber column with a 5×60° chamfer as an example) is described.

[0080] 1. Angle setting

[0081] Loosen the butterfly positioning locking pin 6, rotate the U-shaped connector 9 to align the pointer window 8 with the 60° mark on the angle scale 7, and lock the butterfly positioning locking pin 6 (torque 8~10N·m).

[0082] 2. Size adjustment

[0083] After the first part, product 13, is clamped, adjust the adjustable support plate 1 so that the chamfered edge of part 13 just touches the abrasive belt surface of the belt grinder, achieving the effect of 'zeroing'. With the angle already adjusted and fixed, turn handle 5 to remove the workpiece from the abrasive belt. Move the adjustable support plate 1 again based on the 'zeroing' value. Here, the adjustment value after 'zeroing' refers to, for example, for a 5×60° chamfer, the adjustment value here is to move forward L=5×sin60°≈4.33mm. After the first part's dimensions are adjusted, use locking bolts to fix the adjustable support plate and the base plate.

[0084] 3. Automated processing

[0085] For subsequent processing of the same model of parts, there is no need to readjust the angle and values ​​again. Start the belt grinder (speed 1500r / min), slowly turn the handle to make the part contact the sanding belt, the sanding belt drives the part to rotate, and after about 30 seconds the handle touches the positioning plate, and the processing is completed.

[0086] In one embodiment, maintenance operations for a convenient cylindrical rubber buffer pad chamfering fixture are as follows:

[0087] Daily cleaning: Use compressed air to blow away rubber debris from the surface of the clamps to prevent it from entering the gaps of the dovetail slide rails.

[0088] Weekly lubrication: Apply lithium-based grease to the mating area between the shaft connecting plate and the hole seat, as well as the contact surface of the dovetail slide rail, to reduce wear.

[0089] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A convenient chamfering fixture for cylindrical rubber buffer pads, characterized in that, include: The base plate (14) has two parallel dovetail slide rails (17) on its surface and adjustable fixing holes (15) with threads at the four corners. The adjustable support plate (1) has a dovetail groove on the bottom surface that mates with the dovetail slide rail (17), and a fixed mounting hole seat (2) and positioning plate (16) on the top surface. The shaft connecting plate (3) is connected to the hole seat (2) at the lower end by an interference fit, and a handle (5) is installed at the upper end. A pin hole is opened on the end face. The U-shaped connector (9) is hinged to the pin hole of the shaft connecting plate (3) by the butterfly positioning locking pin (6) between the two side plates. A top shaft is provided on the outer side of the top end face. The center line of the top shaft is inclined downward at a 1.5° angle to the side plate. A miniature three-jaw chuck (12) is mounted on the top shaft of the U-shaped connector (9) via a bearing (10), and three adjustment holes (11) are evenly distributed around the chuck. An angle scale (7) is fixed to the side of the shaft connecting plate (3) and is used to measure the rotation angle of the U-shaped connector (9); A numerical scale (18) is located at the edge of the upper surface of the base plate (14) and is used to measure the moving displacement of the adjustable tray (1).

2. The convenient chamfering fixture for cylindrical rubber buffer pads according to claim 1, characterized in that: The clearance between the dovetail slide rail (17) and the dovetail groove is ≤0.05mm. The slide rail accuracy grade is H7, the length is 200mm and the spacing is 320mm.

3. The convenient chamfering fixture for cylindrical rubber buffer pads according to claim 1, characterized in that: The U-shaped connector (9) and the shaft connecting plate (3) form a rotary pair, which, together with the angle scale (7), realizes continuous angle adjustment from 0° to 90° with an adjustment error of ≤ ±0.5°; and a pointer window (8) is opened on the upper side plate of the U-shaped connector (9).

4. The convenient chamfering fixture for cylindrical rubber buffer pads according to claim 3, characterized in that: The 1.5° downward tilt angle of the top shaft of the U-shaped connector (9) makes the axis of the clamped part form a constant negative angle with the sand belt plane.

5. The convenient chamfering fixture for cylindrical rubber buffer pads according to claim 1, characterized in that: The adjustable tray (1) moves along the dovetail slide rail (17) and, in conjunction with the numerical scale (18), achieves chamfer size adjustment from 0 to 20 mm, with repeatability accuracy ≤ ±0.2 mm.

6. The convenient chamfering fixture for cylindrical rubber buffer pads according to claim 1, characterized in that: The positioning plate (16) is a vertical structure, and its inner side is tangent to the rotation trajectory of the shaft connecting plate (3), forming a mechanical hard limit.

7. The convenient chamfering fixture for cylindrical rubber buffer pads according to claim 1, characterized in that: The miniature three-jaw chuck (12) has a jaw stroke of 5-30mm and is compatible with cylindrical rubber parts of φ10-φ50mm.

8. The convenient chamfering fixture for cylindrical rubber buffer pads according to claim 1, characterized in that: The center of the adjustment hole (11) is 25mm from the center of the chuck, and it is compatible with an M6 hex wrench to achieve quick clamping.

9. A convenient chamfering fixture for cylindrical rubber buffer pads according to claim 1, characterized in that: A locking bolt (4) is provided between the base plate (14) and the adjustable support plate (1) to fix the position after size adjustment.

10. A convenient chamfering fixture for cylindrical rubber buffer pads according to claim 1, characterized in that: An elastic limiting post is added next to the positioning plate (16), which together with the positioning plate constitutes a double overload protection mechanism.

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