Floating clamp for brake drum machining

Abstract

The utility model relates to the technical field of clamps for brake drum machining, and discloses a floating clamp for brake drum machining, which comprises a machining table, sliding rods are fixedly connected to the front side and the rear side of the top end of the machining table, clamping tables are slidably connected to the outer walls of the sliding rods, and transmission lead screws are rotatably connected to the outer walls of the opposite ends of the clamping tables. A second supporting plate is connected to the outer wall of the transmission lead screw through a moving set, connecting pipes are fixedly connected to the opposite ends of the clamping tables, outer supporting plates are connected to the outer walls of the connecting pipes through supporting sets, a loading plate is fixedly connected to the bottom end of the machining table, and a driving motor is fixedly connected to the top end of the loading plate. The driving end of the driving motor is connected with a traction plate through a butt joint set. According to the device, the brake drums with different diameters can be conveniently clamped and machined, self-adaptive adjustment of the length of a workpiece is achieved, it is ensured that the positioning precision is improved, and full-stroke switching can be completed within a short time.

Description

Technical Field

[0001] This utility model relates to the field of fixtures for brake drum processing, and in particular to a floating fixture for brake drum processing. Background Technology

[0002] In the field of machining, brake drums are a key component of automotive braking systems. Their machining accuracy directly affects braking performance, safety, and service life. Brake drums are usually cylindrical parts made of cast iron or alloy materials. The machining process involves precision turning or grinding of key parts such as inner holes, outer circles, and end faces. Due to the complex structure of brake drums and the strict requirements for geometric tolerances, traditional clamping methods are prone to workpiece deformation or machining errors due to uneven clamping force or positioning errors. Therefore, floating fixtures have emerged as a key process equipment for solving such problems.

[0003] In brake drum machining, traditional fixtures have the following problems: brake drums are mostly thin-walled parts, and excessive clamping force or local stress concentration can cause elastic deformation of the workpiece. After machining, stress release can cause dimensional deviations. Furthermore, when there are casting errors or deviations in the previous process in the workpiece blank, traditional fixtures are difficult to make fine compensations and require frequent addition of shims for auxiliary fixation, which is inefficient. In addition, different specifications of brake drums require changing fixtures or readjusting, which makes it difficult to meet the needs of multi-variety, small-batch production.

[0004] In response to this technical problem, this application proposes a floating fixture for machining brake drums. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a floating fixture for brake drum processing. This fixture facilitates the clamping and processing of brake drums of different diameters, enables adaptive adjustment of workpiece length, ensures improved positioning accuracy, and allows for full stroke switching in a short time.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A floating clamp for processing brake drums includes a processing table. Slide rods are fixedly connected to both the front and rear sides of the top of the processing table. A clamping platform is slidably connected to the outer wall of each slide rod. A transmission screw is rotatably connected to the outer wall of each opposite end of the clamping platform. A support plate is connected to the outer wall of each transmission screw via a moving assembly. A connecting pipe is fixedly connected to the opposite end of each clamping platform. An outer support plate is connected to the outer wall of each connecting pipe via a support assembly. A loading plate is fixedly connected to the bottom of the processing table. A drive motor is fixedly connected to the top of the loading plate. A traction plate is connected to the driving end of the drive motor via a docking assembly.

[0008] Furthermore, a support frame is fixedly connected to the outer wall of the top of the processing table, an electric hydraulic cylinder is fixedly connected to the top of the support frame, and a support plate is fixedly connected to the drive end of the electric hydraulic cylinder.

[0009] Furthermore, the moving assembly includes a transition block that is threadedly connected to the outer wall of the transmission screw. The two support plates are rotatably connected to the four sides of the outer wall of the transition block at opposite ends, and the two support plates are rotatably connected to the inner wall of the opposite end of the outer support plate at opposite ends.

[0010] Furthermore, the support assembly includes a support plate located on all four sides of the outer wall at both ends of the connecting pipe, and one end of the support plate is rotatably connected to the inner wall of the opposite end of the outer support plate.

[0011] Furthermore, each of the outer support plates has a first adhesive plate fixedly connected to the outer wall of the opposite end, and each of the outer support plates has a second adhesive plate fixedly connected to the outer wall of the opposite end.

[0012] Furthermore, the docking assembly includes a rotating wheel fixedly connected to the drive end of the drive motor, and the outer wall of the bottom end of the traction plate is rotatably connected to the front and rear ends of the rotating wheel.

[0013] Furthermore, each of the traction plates has a fixed plate rotatably connected to one of its opposite ends, and the fixed plate has one of its opposite ends fixedly connected to the bottom end of the clamping table. The outer wall of the fixed plate is slidably connected to the inner wall of the top of the processing table.

[0014] This utility model has the following beneficial effects:

[0015] 1. In this utility model, the rotating transmission screw drives the transition block to move linearly, pushing the second support plate to move outward. The first support plate and the outer support plate together form a crank-slider mechanism, so that the outer support plate expands or contracts radially synchronously. When expanding, the outer bonding plate 1 flexibly supports the inner cavity of the workpiece. When contracting, the inner hard alloy bonding plate 2 clamps the outer diameter of the brake drum at four points, which facilitates the device to clamp and process brake drums of different diameters.

[0016] 2. In this utility model, after the brake drum workpiece is placed on the pallet, the electric hydraulic cylinder is activated to drive the pallet to rise and fall, so that the workpiece axis is coaxial with the transmission screw. The drive motor drives the rotating wheel to rotate via the synchronous belt. The traction plate converts the rotation into linear traction force, pulling the fixed plate to move along the linear guide rail of the slide rod, driving the clamping table to move axially, realizing adaptive adjustment of the workpiece length, ensuring improved positioning accuracy, and enabling full stroke switching to be completed in a short time. Attached Figure Description

[0017] Figure 1 This is a perspective view of a floating fixture for processing brake drums according to the present invention.

[0018] Figure 2This is a half-sectional view of the support frame of a floating fixture for processing brake drums according to the present invention;

[0019] Figure 3 This is a half-sectional view of the clamping table of a floating fixture for processing brake drums proposed in this utility model;

[0020] Figure 4 This is a half-sectional view of the machining table for a floating fixture used in machining brake drums according to this utility model.

[0021] Legend:

[0022] 1. Processing table; 2. Slide bar; 3. Clamping table; 4. Support frame; 5. Electric hydraulic cylinder; 6. Pallet; 7. Transmission screw; 8. Connecting pipe; 9. Support plate one; 10. Outer support plate; 11. Adapter block; 12. Drive motor; 13. Rotating wheel; 14. Traction plate; 15. Support plate two; 16. Adhesive plate one; 17. Adhesive plate two; 18. Fixing plate; 19. Loading plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Reference Figure 1 and Figure 3 This utility model provides an embodiment of a floating fixture for processing brake drums, comprising a processing table 1. Slide rods 2 are fixedly connected to both the front and rear sides of the top of the processing table 1. A clamping platform 3 is slidably connected to the outer wall of the slide rods 2. A transmission screw 7 is rotatably connected to the outer wall of the opposite end of the clamping platform 3. A support plate 15 is connected to the outer wall of the transmission screw 7 via a moving assembly. A connecting pipe 8 is fixedly connected to the opposite end of the clamping platform 3. An outer support plate 10 is connected to the outer wall of the connecting pipe 8 via a support assembly. The moving assembly includes components threaded to the outer wall of the transmission screw 7. The adapter block 11 is connected to the support plate 15. The support plate 15 is rotatably connected to the four sides of the outer wall of the adapter block 11 at one end. The opposite ends of the support plate 15 are rotatably connected to the inner wall of the opposite end of the outer support plate 10. The support group includes a support plate 9 located on the four sides of the outer wall of the left and right ends of the connecting pipe 8. The opposite ends of the support plate 9 are rotatably connected to the inner wall of the opposite end of the outer support plate 10. The opposite ends of the outer support plate 10 are fixedly connected to the outer wall of the outer support plate 10. The opposite ends of the outer support plate 10 are fixedly connected to the adhesive plate 16. The opposite ends of the outer support plate 10 are fixedly connected to the adhesive plate 17.

[0025] Specifically: When the operator drives the transmission screw 7 to rotate via CNC system commands, the transmission screw 7 adopts a pre-tightened backlash-free ball screw pair with a lead of 5mm and a repeatability of ±0.005mm. Its precision threaded pair converts the rotational motion into the axial linear displacement of the adapter block 11. The adapter block 11 pushes the support plate 2 15 to swing outward around the rotation center of the support plate 1 9 (the arc-shaped guide rail with self-locking function on the fixed base) through a hinged linkage mechanism. The support plate 2 15 is designed as a double-fulcrum lever structure. The support plate 1 9 and the arc-shaped guide rail with self-locking function on the fixed base form a mechanical force amplification ratio of 1:3.5. This drives the outer support plate 10 to expand or contract synchronously in the radial direction. When expanding, the bonding plate 16 installed on the outer side of the outer support plate 10 presses against the inner wall of the workpiece in a flexible contact manner. The bonding plate 16 is made of polyurethane-carbon fiber composite material with a Shore hardness of 80A. The contact surface is profiled and ground to control the deformation of the thin-walled brake drum. When contracting, the bonding plate 17 on the inner side of the outer support plate 10 forms a four-point positioning clamp. The bonding plate 17 adopts a hard alloy inlaid tungsten steel toothed claw with a biting angle of 15°. Combined with the dynamic clamping force controlled by the hydraulic proportional valve, it can adapt to the clamping requirements of brake drum outer diameter of Φ200-Φ450mm.

[0026] Reference Figure 2 and Figure 4 A loading plate 19 is fixedly connected to the bottom of the processing table 1, and a drive motor 12 is fixedly connected to the top of the loading plate 19. The drive end of the drive motor 12 is connected to a traction plate 14 through a docking assembly. A support frame 4 is fixedly connected to the outer wall of the top of the processing table 1, and an electric hydraulic cylinder 5 is fixedly connected to the top of the support frame 4. A support plate 6 is fixedly connected to the drive end of the electric hydraulic cylinder 5. The docking assembly includes a rotating wheel 13 fixedly connected to the drive end of the drive motor 12. The outer wall of the bottom of the traction plate 14 is rotatably connected to the front and rear ends of the rotating wheel 13. A fixed plate 18 is rotatably connected to the opposite end of the traction plate 14. The opposite end of the fixed plate 18 is fixedly connected to the bottom of the clamping table 3. The outer wall of the fixed plate 18 is slidably connected to the inner wall of the top of the processing table 1.

[0027] Specifically: After the brake drum workpiece to be processed is placed in the V-shaped positioning groove of the pallet 6, the electric hydraulic cylinder 5 is started to drive the pallet 6 to rise and fall vertically. The workpiece height is fed back in real time by the laser range sensor and closed-loop calibration is performed with the axis coordinate of the transmission screw 7 to ensure that the coaxiality error between the workpiece center line and the rotation axis of the transmission screw 7 is low. Then the drive motor 12 is started, and the rotating wheel 13 is driven to rotate through the synchronous belt drive. The rotational motion of the rotating wheel 13 is converted into linear traction force by the traction plate 14, which pulls the fixed plate 18 to move horizontally along the linear ball guide rail of the slide bar 2. The fixed plate 18 drives the clamping table 3 to move synchronously through the wedge-shaped dovetail structure. Its movement is monitored in real time by the grating ruler and fed back to the control system to realize the adaptive adjustment of the axial length of the brake drum. In the coarse adjustment stage, the drive motor 12 runs at a high speed of 800 rpm, and in the fine adjustment stage, it switches to a low speed mode of 50 rpm. With the help of the slide bar 2, the clamping table 3 forms a rigid support at the target position.

[0028] Working principle: When the brake drum workpiece to be processed is placed on the pallet 6, the electric hydraulic cylinder 5 is activated to lift the pallet 6, aligning the workpiece on the pallet 6 with the axis of the transmission screw 7. Then, the drive motor 12 rotates, causing the rotating wheel 13 to rotate. This, in turn, pulls the fixed plate 18 relative to the traction plate 14, causing the fixed plate 18 to move the clamping table 3 at the slide rod 2. The device is adjusted according to the workpiece length, and the transmission screw 7 is rotated to connect the... Under the action of the threaded transmission, the adapter block 11 causes the support plate 2 15 to move outward, so that the outer support plate 10, with the cooperation of the support plate 2 15 and the support plate 1 9, can open outward or retract inward. This allows the outer support plate 10 to support the inner cavity of the workpiece through the outer side of the bonding plate 16, or to clamp the workpiece through the bonding plate 2 17 at the outer support plate 10. This allows the device to be adjusted according to the outer or inner diameter of the brake drum, so that the outer support plate 10 can stably clamp the brake drum.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A floating fixture for machining brake drums, comprising a machining table (1), characterized in that: The processing table (1) has sliding rods (2) fixedly connected to both the front and rear sides of the top. The outer wall of the sliding rods (2) is slidably connected to a clamping table (3). The outer wall of the opposite end of the clamping table (3) is rotatably connected to a transmission screw (7). The outer wall of the transmission screw (7) is connected to a support plate (15) via a moving assembly. The opposite end of the clamping table (3) is fixedly connected to a connecting pipe (8). The outer wall of the connecting pipe (8) is connected to an outer support plate (10) via a support assembly. The bottom end of the processing table (1) is fixedly connected to a loading plate (19). The top end of the loading plate (19) is fixedly connected to a drive motor (12). The driving end of the drive motor (12) is connected to a traction plate (14) via a docking assembly.

2. The floating fixture for processing brake drums according to claim 1, characterized in that: The processing table (1) has a support frame (4) fixedly connected to the outer wall of the top end, and an electric hydraulic cylinder (5) is fixedly connected to the top end of the support frame (4). The drive end of the electric hydraulic cylinder (5) is fixedly connected to a support plate (6).

3. The floating fixture for processing brake drums according to claim 1, characterized in that: The moving assembly includes a transition block (11) that is threadedly connected to the outer wall of the transmission screw (7). The two support plates (15) are rotatably connected to the four sides of the outer wall of the transition block (11) at opposite ends, and the opposite ends of the two support plates (15) are rotatably connected to the inner wall of the opposite end of the outer support plate (10).

4. A floating fixture for processing brake drums according to claim 1, characterized in that: The support assembly includes a support plate (9) located on the outer walls of the left and right ends of the connecting pipe (8) and rotatably connected to all four sides. The opposite ends of the support plate (9) are rotatably connected to the inner walls of the opposite ends of the outer support plate (10).

5. A floating fixture for processing brake drums according to claim 1, characterized in that: Each of the outer support plates (10) has a bonding plate (16) fixedly connected to the outer wall of the opposite end, and a bonding plate (17) fixedly connected to the outer wall of the opposite end.

6. A floating fixture for processing brake drums according to claim 1, characterized in that: The docking assembly includes a rotating wheel (13) fixedly connected to the drive end of the drive motor (12), and the bottom outer wall of the traction plate (14) is rotatably connected to the front and rear ends of the rotating wheel (13).

7. A floating fixture for processing brake drums according to claim 1, characterized in that: Each of the traction plates (14) is rotatably connected to a fixed plate (18) at one of its opposite ends. The fixed plates (18) are respectively fixedly connected to the bottom end of the clamping table (3) at one of its opposite ends. The outer wall of the fixed plate (18) is slidably connected to the inner wall of the top of the processing table (1).

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