Workpiece clamping positioning mechanism for counterweight milling

Abstract

The utility model relates to counterweight block processing equipment technical field, concretely for a kind of workpiece clamping positioning mechanism for counterweight block milling flat processing, it includes: support platform, its lower surface four corners fixedly connected mounting rod, upper surface is fixedly connected with processing table by support column. The inner positioning mechanism is arranged in the center of processing table, and the outer positioning mechanism is arranged around. The inner positioning mechanism is composed of connecting plate, sliding block, inner support soft head block, slide rail and fixed plate, and the first drive assembly drives the inner support soft head block to move along the radial direction;The outer positioning mechanism includes four arc-shaped plates, one side of which is fixed with a non-slip soft pad, and the bottom is connected with the second drive assembly for driving the arc-shaped plates to move reversely along the radial direction. The inner and outer positioning mechanisms cooperate to apply balanced clamping force to the inner hole and the outer contour of the workpiece simultaneously, solving the problem of workpiece sliding and deformation, ensuring stable clamping, improving processing accuracy and safety, and avoiding flat quality defects.

Description

Technical Field

[0001] This utility model relates to the technical field of counterweight processing equipment, specifically a workpiece clamping and positioning mechanism for milling counterweights. Background Technology

[0002] Counterweights are key components in engineering machinery, automobiles, and heavy equipment used to adjust weight distribution and ensure stable and safe operation. These parts are typically cast from materials such as cast iron. The mounting surface after casting is relatively rough and requires milling to achieve a smooth, highly flat surface, thereby ensuring the installation accuracy and connection reliability on the host machine.

[0003] In existing technologies, when counterweights are machined on milling machines, various clamping and positioning mechanisms are generally used to fix the workpiece in order to ensure machining accuracy. Common clamping and positioning methods include using a three-jaw chuck, a flat-jaw vise, or directly pressing the workpiece onto the milling machine table using a pressure plate. These traditional clamping methods typically rely on applying force to the outer wall, outer contour, or end face of the counterweight to achieve workpiece positioning and clamping.

[0004] The aforementioned clamping and positioning mechanism has the following drawbacks, which are particularly pronounced when machining counterweights that are similar to discs with a central through-hole: relying solely on the frictional force generated by external clamping to resist the enormous cutting forces and vibrations during milling poses a stability risk for heavy counterweights. This can lead to slight slippage or loosening of the workpiece during machining, affecting machining quality, or even damaging the tool and causing safety accidents. To overcome this slippage problem, a larger external clamping force is often required, which can easily cause elastic deformation in castings with uneven rigidity. After milling, the workpiece returns to its original shape, causing distortion of the machined surface and further reducing machining quality. Therefore, this invention proposes a workpiece clamping and positioning mechanism for milling counterweights to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a workpiece clamping and positioning mechanism for milling counterweights, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a workpiece clamping and positioning mechanism for milling counterweight blocks, comprising: a support platform, mounting rods fixedly connected to the four corners of the lower surface of the support platform, the upper surface of the support platform being fixedly connected to the processing table via support columns, an inner positioning mechanism being provided at the center of the processing table, and an outer positioning mechanism being provided around the processing table. The internal positioning mechanism includes a connecting plate, a slider rotatably connected to one end of the connecting plate, an internal support soft head block fixedly connected to one end of the slider, a slide rail slidably connected to the bottom of the slider, a fixed plate fixedly connected to the bottom of the slide rail, the fixed plate being fixedly installed at the center of the processing table, and a first drive assembly connected to the other end of the connecting plate. The first drive assembly drives the internal support soft head block to move along the radial direction of the disc workpiece. The external positioning mechanism includes an arc-shaped plate, and four arc-shaped plates are arranged in a circle about the upper surface of the processing table. An anti-slip pad is fixedly connected to one side of the arc-shaped plate, and a second driving component is connected to the bottom of the arc-shaped plate. The second driving component is used to drive the arc-shaped plate to move in the opposite direction along the radial direction of the disc workpiece.

[0007] Preferably, the first drive assembly includes a rotary cylinder and a turntable. The rotary cylinder is fixedly installed between the support table and the processing table, and the output shaft of the rotary cylinder passes through the fixed plate and is fixedly connected to the center of the turntable.

[0008] Preferably, the edge of the turntable is rotatably connected to one end of the connecting plate via a connecting pin, and the other end of the connecting plate is rotatably connected to the slider via a limiting pin.

[0009] Preferably, both the support platform and the processing table have four guide holes on their surfaces, which are arranged in a rectangular shape. The center of the lower surface of the support platform is fixedly connected to the support plate via a fixing column.

[0010] Preferably, the second drive assembly includes a motor, a rotating shaft fixedly connected to the motor output shaft, a drive gear fixedly sleeved with the rotating shaft, a driven gear meshing with the drive gear, a threaded rod fixedly connected to the driven gear, and a connecting block threadedly sleeved with the threaded rod.

[0011] Preferably, the motor is fixedly installed on the lower surface of the support plate, the output end of the motor passes through the support plate and is fixedly connected to the bottom end of the rotating shaft, the top end of the rotating shaft is rotatably sleeved on the lower side of the support platform, driven gears are meshed around the upper side of the drive gear, the threaded rod is rotatably sleeved in the limiting seat fixedly connected to the lower surface of the support platform, the upper surface of the connecting block and the lower surface of the arc plate are fixedly connected by a connecting rod, and the connecting rod is slidably sleeved in the guide hole.

[0012] Compared with the prior art, the beneficial effects of this utility model are: By combining a radially expandable inner positioning mechanism with a radially retractable outer positioning mechanism, a balanced clamping force can be applied simultaneously from the internal hole and the external contour of the workpiece. This effectively overcomes the problems of easy slippage of the workpiece and deformation caused by excessive clamping force when clamped only from the outside. Thus, the workpiece is securely clamped during the machining process, improving the accuracy and safety of milling and avoiding planar quality defects caused by the elastic recovery of the workpiece. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a bottom view of the overall structure of this utility model; Figure 3 This is a top view of the overall structure of this utility model; Figure 4 This is a side view of the overall structure of this utility model.

[0014] In the diagram: 1. Support platform; 2. Mounting rod; 3. Machining table; 4. Connecting plate; 5. Slider; 6. Inner support soft head block; 7. Slide rail; 8. Fixing plate; 9. Arc plate; 10. Anti-slip soft pad; 11. Rotary cylinder; 12. Turntable; 13. Guide hole; 14. Fixing column; 15. Support plate; 16. Motor; 17. Rotating shaft; 18. Drive gear; 19. Driven gear; 20. Threaded rod; 21. Connecting block; 22. Connecting rod; 23. Support column. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] Please see Figures 1 to 4This utility model provides a technical solution: a workpiece clamping and positioning mechanism for milling counterweights, comprising: a support platform 1, with mounting rods 2 fixedly connected to the four corners of the lower surface of the support platform 1. The mounting rods 2 facilitate support and fixation of the support platform 1, and can also be fixed to the milling machine's machining panel, thus facilitating the machining of the workpiece after positioning and clamping. The upper surface of the support platform 1 is fixedly connected to a machining table 3 via support columns 23, supporting the machining table 3 and thus supporting the workpiece. An inner positioning mechanism is provided at the center of the machining table 3 to position the workpiece from the inside. Outer positioning mechanisms are provided around the machining table 3 to position the workpiece from the outside. The inner positioning mechanism includes a connecting plate 4, a slider 5 rotatably connected to one end of the connecting plate 4, and... The slider 5 is fixedly connected to an inner support soft head block 6 at one end, a slide rail 7 is slidably connected to the bottom of the slider 5, a fixed plate 8 is fixedly connected to the bottom of the slide rail 7, the fixed plate 8 is fixedly installed at the center of the processing table 3, and a first drive assembly is connected to the other end of the connecting plate 4. The first drive assembly drives the inner support soft head block 6 to move in the radial direction of the disc workpiece. The head of the inner support soft head block 6 is made of rubber, thereby increasing the friction with the inner hole of the workpiece. The outer positioning mechanism includes an arc plate 9, four arc plates 9 are provided, and the four arc plates 9 are arranged in a circle about the upper surface of the processing table 3. An anti-slip soft pad 10 is fixedly connected to one side of the arc plate 9, which protects the workpiece and increases the friction with the outer ring surface of the workpiece. A second drive assembly is connected to the bottom of the arc plate 9, and the second drive assembly is used to drive the arc plate 9 to move in the opposite direction in the radial direction of the disc workpiece.

[0017] In use, the entire device is fixed to the machining panel of the milling machine via the mounting rod 2. When machining a counterweight block that is similar to a disc and has a through hole in the center, the counterweight block is placed on the upper surface of the machining table 3, so that the inner support soft head block 6 is in the inner hole of the workpiece. At this time, driven by the first drive assembly, the connecting plate 4 drives the slider 5 to move. Under the limiting guidance of the slide rail 7, the slider 5 drives the inner support soft head block 6 to move outward along the radial direction of the workpiece until it is tightly abutting against the inner hole of the workpiece, thereby completing the internal positioning of the workpiece. Then, driven by the second drive assembly, the four arc-shaped plates 9 are driven along the radial direction of the workpiece. Move inward until the anti-slip pad 10 fixedly connected to one side of the arc plate 9 is in close contact with the outer ring surface of the workpiece, thereby completing the external positioning of the workpiece. By simultaneously positioning and clamping the workpiece from the inside and outside, it is possible to avoid the workpiece from slipping or loosening slightly during the processing. This could affect the processing quality, or even damage the tool or cause a safety accident. At the same time, by positioning from the inside and outside, it is possible to avoid the need to apply a larger external clamping force, which could easily cause elastic deformation of the casting with uneven rigidity. After milling, the workpiece returns to its original shape, causing the machined surface to twist, thus reducing the processing quality.

[0018] The first drive assembly includes a rotary cylinder 11 and a turntable 12. The rotary cylinder 11 is electrically connected to an external control device. The rotary cylinder 11 is fixedly installed between the support platform 1 and the processing table 3. The output shaft of the rotary cylinder 11 passes through the fixed plate 8 and is fixedly connected to the center of the turntable 12. The edge of the turntable 12 is rotatably connected to one end of the connecting plate 4 through a connecting pin. The other end of the connecting plate 4 is rotatably connected to the slider 5 through a limit pin.

[0019] When it is necessary to position the workpiece from the inside, the output end of the rotary cylinder 11 is controlled to rotate, thereby driving the turntable 12 to rotate. The turntable 12 is connected to the connecting plate 4 by rotation, which in turn drives the connecting plate 4 to move. The connecting plate 4 then drives the slider 5 to move. Under the limiting guidance of the slide rail 7, the slider 5 drives the inner support soft head block 6 to move outward along the radial direction of the workpiece until it is tightly abutted against the inner hole of the workpiece, thereby completing the internal positioning of the workpiece.

[0020] Both the support table 1 and the processing table 3 have four guide holes 13 on their surfaces, arranged in a rectangular shape. The center of the lower surface of the support table 1 is fixedly connected to the support plate 15 via a fixing post 14. The second drive assembly includes a motor 16, which is electrically connected to an external control device, a rotating shaft 17 fixedly connected to the output shaft of the motor 16, a drive gear 18 fixedly sleeved with the rotating shaft 17, a driven gear 19 meshing with the drive gear 18, a threaded rod 20 fixedly connected to the driven gear 19, and a connecting block 21 threadedly sleeved with the threaded rod 20. The motor 16 is fixedly mounted on the lower surface of the support plate 15, and the output end of the motor 16 passes through the support plate 15 and is connected to the rotating shaft 17. The bottom end is fixedly connected, and the top end of the rotating shaft 17 is rotatably sleeved on the lower side of the support platform 1. The rotating shaft 17 is limited by the support plate 15 and the support platform 1. The drive gear 18 has driven gears 19 meshing around its upper side. The drive gear 18 and driven gears 19 mesh and transmit power. The threaded rod 20 is rotatably sleeved in the limiting seat fixedly connected to the lower surface of the support platform 1. The limiting seat limits the threaded rod 20, thereby improving the rotational stability of the threaded rod 20. The upper surface of the connecting block 21 is fixedly connected to the lower surface of the arc plate 9 by the connecting rod 22. The connecting rod 22 is slidably sleeved in the guide hole 13. The guide hole 13 limits the connecting rod 22, thereby improving the stability of the connecting rod 22 driving the arc plate 9 to move.

[0021] When it is necessary to limit the external position of the workpiece, the motor 16 is started, which drives the rotating shaft 17 to rotate. The rotating shaft 17 then drives the drive gear 18 to rotate. The drive gear 18 meshes with the four driven gears 19 on its upper side, thereby driving the driven gears 19 to rotate. The driven gears 19 then drive the threaded rod 20 to rotate. Under the action of the rotation of the threaded rod 20, the threaded rod 20 drives the threaded connecting block 21 on it to move. The connecting block 21 drives the arc plate 9 to move through the connection of the connecting rod 22. The connecting rod 22 moves radially towards the workpiece under the limiting guidance of the guide hole 13 until the anti-slip soft pad 10 is in close contact with the outer ring surface of the workpiece, thereby completing the clamping and positioning of the external position of the workpiece.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A workpiece clamping and positioning mechanism for milling counterweights, comprising a support table (1), characterized in that: The support platform (1) has four fixedly connected mounting rods (2) at the four corners of its lower surface. The upper surface of the support platform (1) is fixedly connected to the processing table (3) through a support column (23). An inner positioning mechanism is provided at the center of the processing table (3), and an outer positioning mechanism is provided around the processing table (3). The internal positioning mechanism includes a connecting plate (4), a slider (5) rotatably connected to one end of the connecting plate (4), an inner support soft head block (6) fixedly connected to one end of the slider (5), a slide rail (7) slidably connected to the bottom of the slider (5), a fixed plate (8) fixedly connected to the bottom of the slide rail (7), the fixed plate (8) being fixedly installed at the center of the processing table (3), and a first drive assembly connected to the other end of the connecting plate (4). The first drive assembly drives the inner support soft head block (6) to move along the radial direction of the disc workpiece. The external positioning mechanism includes an arc plate (9), and four arc plates (9) are provided. The four arc plates (9) are arranged in a circle about the upper surface of the processing table (3). An anti-slip pad (10) is fixedly connected to one side of the arc plate (9). A second drive assembly is connected to the bottom of the arc plate (9). The second drive assembly is used to drive the arc plate (9) to move in the opposite direction along the radial direction of the disc workpiece.

2. The workpiece clamping and positioning mechanism for milling counterweights according to claim 1, characterized in that: The first drive assembly includes a rotary cylinder (11) and a turntable (12). The rotary cylinder (11) is fixedly installed between the support table (1) and the processing table (3). The output shaft of the rotary cylinder (11) passes through the fixed plate (8) and is fixedly connected to the center of the turntable (12).

3. The workpiece clamping and positioning mechanism for milling counterweights according to claim 2, characterized in that: The edge of the turntable (12) is rotatably connected to one end of the connecting plate (4) by a connecting pin, and the other end of the connecting plate (4) is rotatably connected to the slider (5) by a limiting pin.

4. The workpiece clamping and positioning mechanism for milling counterweights according to claim 1, characterized in that: The support platform (1) and the processing table (3) are provided with four guide holes (13) on their surfaces. The four guide holes (13) are arranged in a rectangular shape. The center of the lower surface of the support platform (1) is fixedly connected to the support plate (15) through a fixed column (14).

5. A workpiece clamping and positioning mechanism for milling counterweights according to claim 1, characterized in that: The second drive assembly includes a motor (16), a rotating shaft (17) fixedly connected to the output shaft of the motor (16), a drive gear (18) fixedly sleeved with the rotating shaft (17), a driven gear (19) meshing with the drive gear (18), a threaded rod (20) fixedly connected to the driven gear (19), and a connecting block (21) threadedly sleeved with the threaded rod (20).

6. A workpiece clamping and positioning mechanism for milling counterweights according to claim 5, characterized in that: The motor (16) is fixedly installed on the lower surface of the support plate (15). The output end of the motor (16) passes through the support plate (15) and is fixedly connected to the bottom end of the rotating shaft (17). The top end of the rotating shaft (17) is rotatably sleeved on the lower side of the support platform (1). The drive gear (18) is meshed with driven gears (19) on all four sides of its upper side. The threaded rod (20) is rotatably sleeved in the limiting seat fixedly connected to the lower surface of the support platform (1). The upper surface of the connecting block (21) is fixedly connected to the lower surface of the arc plate (9) through the connecting rod (22). The connecting rod (22) is slidably sleeved in the guide hole (13).

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