Centering and clamping mechanism

Abstract

This utility model relates to the field of machining and discloses a centering clamping mechanism, including a workpiece base, a support platform, a clamping assembly, a drive assembly, and a reset assembly. It mainly uses a cylinder to provide power, pushing a V-shaped plate downwards. A steel ball then drives a connecting rod to rotate, causing a protrusion on a clamping pin fitted onto the connecting rod to embed into the workpiece's mounting shaft, thus clamping the workpiece. The workpiece itself is placed on the workpiece base, with the workpiece center stabilized by a column on the workpiece base. The workpiece base and the clamping device together achieve centering and clamping of the workpiece. During reset, the spring's reset elastic force sequentially pushes the connecting rod and the steel ball to move the V-shaped plate upwards, restoring the initial state. This utility model has the advantages of good shock resistance and high stability.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a centering clamping mechanism. Background Technology

[0002] As the manufacturing industry moves towards higher precision and efficiency, centering clamping mechanisms have emerged. These mechanisms can automatically position the center of a workpiece at a specific location while clamping it, playing a crucial role in improving the accuracy and quality of machining. Furthermore, with technological advancements, higher demands are being placed on the shock resistance and stability of centering clamping mechanisms.

[0003] Chinese utility model patent application CN 221517402 U discloses a clamp for automotive parts, including a base and an automatic centering clamping assembly. A low-speed cylinder sequentially drives a connecting plate, a wing plate, and a connecting block to move. The movable arm rotates as the wing plate moves, and three second rollers clamp the pipe fitting so that its center point coincides with the center point of the drilling rig spindle. However, the connecting plate of this utility model is only supported at one end by a slider, and the relatively heavy spring is only fixed at both ends, leaving the middle suspended. The movable arm is only supported by a rotating shaft. The support method is that a small object supports a large object, resulting in structural instability. In addition, the movable arm is connected to the connecting plate through rollers, which limits the angle of movement. It has only one degree of freedom in the axial direction, resulting in weak self-adaptive ability. Utility Model Content

[0004] The purpose of this invention is to provide a centering clamping mechanism that has the advantages of good shock resistance and high stability.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a centering clamping mechanism, including a workpiece base and a support platform, the support platform being fixedly mounted on a processing equipment, the workpiece base being snapped into the end of the support platform, and further including a clamping assembly for clamping the workpiece and a driving assembly for driving the clamping assembly to complete the clamping action, a support plate being fixedly mounted on the support platform, the clamping assembly including a connecting rod, a connecting rod shaft and a clamping pin, the connecting rod being slidably mounted inside the support plate, the connecting rod shaft being slidably mounted through the connecting rod, the connecting rod shaft being fixedly mounted above the support platform, the clamping pin being sleeved on the end of the connecting rod, and the clamping pin having a protrusion corresponding to the mounting shaft of the workpiece.

[0006] By adopting the above technical solution, the workpiece is placed on the workpiece base, and the center position of the workpiece is on the same vertical line as the center of the support platform, thus achieving centering of the workpiece. When it is necessary to clamp the workpiece, the drive assembly drives the connecting rod to move to the left and right at the support platform end, thereby driving the connecting rod to rotate around the connecting rod shaft. One end of the clamping pin of the connecting rod is tightened, and the protrusions on the clamping pins at both ends are embedded in the mounting shaft of the workpiece, restricting the workpiece from moving, thus achieving centering and clamping of the workpiece.

[0007] The present invention is further configured such that: the clamping assembly also includes a side positioning seat, the side positioning seat is fixedly disposed above the support platform, the connecting rod shaft is rotatably disposed inside the side positioning seat, and the side positioning seat has a channel corresponding to the shape of the connecting rod end and the clamping pin.

[0008] By adopting the above technical solution, the rotation of the connecting rod is realized in the support plate. The side positioning seat also has a channel corresponding to the shape of the connecting rod end and the clamping pin. The support plate and the side positioning seat together support the connecting rod. At the same time, the connecting rod shaft is located in the side positioning seat, which enhances the stability of the connecting rod shaft and extends its service life.

[0009] The present invention is further configured such that: the driving assembly includes a cylinder, a V-shaped plate, and a steel ball; the cylinder is located above the support platform; the V-shaped plate is located inside the support plate and directly below the cylinder; the support plate has a first sliding channel for the V-shaped plate to move up and down; the steel ball is located on both sides of the V-shaped plate; and the support plate has a second sliding channel for the steel ball to move left and right.

[0010] By adopting the above technical solution, steel balls are placed between the V-shaped plate and the connecting rod, transforming the sliding friction between the V-shaped plate and the connecting rod into rolling friction between the two and the steel balls. This reduces the coefficient of friction and extends the service life of the equipment. At the same time, the steel balls act as a buffer against the vibration caused by the sudden downward movement of the V-shaped plate, preventing the connecting rod from directly causing large-amplitude shaking. Furthermore, the steel balls have three degrees of freedom on the contact surface (rotation along the x, y, and z axes), allowing them to more flexibly adapt to minor unevenness or angular deviations on the contact surface.

[0011] A further feature of this invention is that the drive assembly also includes a floating joint, a hole corresponding to the shape of the floating joint is provided on the V-shaped plate, the floating joint is snapped into the V-shaped plate, a push column is fixedly provided at the lower end of the cylinder, and a through hole corresponding to the push column is provided on the floating joint.

[0012] By adopting the above technical solution, the cylinder pushes the floating joint downward, and the floating joint then transmits the downward movement to the V-shaped plate. Compared with the cylinder directly pushing the V-shaped plate, the contact area between the floating joint and the V-shaped plate is larger, the pressure on the V-shaped plate is reduced during the downward movement, and the service life of the V-shaped plate is extended.

[0013] The present invention is further configured to include a reset assembly, which includes a spring, a spring support rod, and a limiting member. The spring support rod is disposed inside the support plate, and the number of springs is set to two. The two springs are respectively sleeved on both ends of the spring support rod. The two ends of the spring support rod are connected to fixing blocks, and the fixing blocks are detachably connected to both ends of the support plate. One end of the spring is fixedly connected to the fixing block, and the end of the connecting rod is sleeved on the middle part of the spring support rod.

[0014] By adopting the above technical solution, automatic reset can be achieved. After the cylinder rises, the reset component pushes the connecting rod and steel ball inward in sequence, pushing the V-plate to move up and reset to the initial state. At the same time, one end of the clamping pin of the connecting rod is released, no longer clamping the workpiece, preparing for the processing of the next workpiece and facilitating workpiece replacement. The spring support rod restricts the movement direction of the connecting rod near the cylinder end, preventing the connecting rod from being suddenly bounced away from the steel ball when it collides with it, thus avoiding a situation where the movement trajectory becomes uncontrollable. At the same time, it supports and limits the spring, ensuring that the spring's stretching and compression can only occur along the axis of the spring support rod. The steel ball base simultaneously supports the spring support rod, spring, connecting rod, and steel ball, preventing equipment instability or even malfunction due to insufficient support.

[0015] A further feature of this invention is that it includes a mounting base and a sensor. The mounting base is fixedly mounted on a support plate, and the shape of the mounting base corresponds to the mounting axis of the workpiece. The sensor is located below the mounting base.

[0016] By adopting the above technical solution, the mounting base supports the mounting shaft of the workpiece. At the same time, the sensor is located below the mounting base. When the sensor detects that a workpiece is placed above, it determines that the workpiece is placed on the workpiece base and the next clamping operation can be carried out. The cylinder moves downward to clamp the workpiece. The determination of whether the workpiece is placed on the workpiece base is achieved by the sensor.

[0017] The beneficial effects of this utility model are: 1. Placing a steel ball between the V-shaped plate and the connecting rod transforms the sliding friction between the V-shaped plate and the connecting rod into rolling friction between the two and the steel ball, reducing the coefficient of friction and extending the service life of the equipment. At the same time, the steel ball acts as a buffer against the vibration caused by the sudden downward movement of the V-shaped plate, preventing the connecting rod from directly causing large-amplitude shaking. Furthermore, the steel ball has three degrees of freedom on the contact surface (rotation along the x, y, and z axes). When faced with minor unevenness or angular deviations on the contact surface, it can more flexibly adapt to and adjust itself compared to a roller with only one degree of rotational freedom (rotation around the cylindrical axis), which cannot adapt to complex surface shapes or angular changes.

[0018] 2. The structure is stable. The steel ball base supports the spring support rod, spring, connecting rod and steel ball at the same time. It also supports and dampens the floating joint. The connecting rod near the workpiece base is also supported by a side positioning seat. The entire device has no workpiece in a suspended or semi-suspended state. Compared with the support method of small objects supporting large objects, the structure is more stable and avoids the instability or even failure of the equipment due to insufficient support force.

[0019] 3. Automatic centering and automatic reset: When the sensor detects that a workpiece is placed on the workpiece base, the cylinder plunges down to clamp and center the workpiece. After a process is completed, the spring's reset elastic force is used to reset the components in the fixture to their initial state, making it easy to replace the next workpiece. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 2 This is a cross-sectional view of the support platform of this utility model.

[0023] Figure 3 This is a top view of the present invention.

[0024] Figure 4 This is a schematic diagram showing the relationship between the cylinder and the floating joint of this utility model.

[0025] Figure 5 This is a schematic diagram of the side positioning seat of this utility model.

[0026] Figure 6 This is a cross-sectional view of the side positioning seat of this utility model.

[0027] Figure 7 This is a schematic diagram of the workpiece.

[0028] In the diagram, 1. Cylinder; 11. Push column; 2. V-plate; 21. Floating joint; 22. Through hole; 3. Steel ball; 4. Connecting rod; 41. Clamping pin; 42. Protrusion; 5. Spring; 51. Spring support rod; 52. Fixing block; 6. Side positioning seat; 61. Connecting rod shaft; 7. Workpiece base; 8. Sensor; 9. Support platform; 91. Support plate; 911. Slide channel one; 912. Slide channel two; 913. Mounting seat; V-plate. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] The mechanical structure of this utility model: A centering clamping mechanism includes a workpiece base 7 and a support platform 9. The support platform 9 is fixedly mounted on a processing equipment. The workpiece base 7 is snapped into the end of the support platform 9. The mechanism also includes a clamping assembly for clamping the workpiece and a driving assembly for driving the clamping assembly to complete the clamping action. A support plate 91 is fixedly mounted on the support platform 9. The clamping assembly includes a connecting rod 4, a connecting rod shaft 61, a side positioning seat 6, and a clamping pin 41. The connecting rod 4 is slidably mounted inside the support plate 91. The side positioning seat 6 is fixedly mounted above the support platform 9. The connecting rod shaft 61 is rotatably mounted inside the side positioning seat 6. The side positioning seat 6 has a channel corresponding to the shape of the end of the connecting rod 4 and the clamping pin 41. The connecting rod shaft 61 slides through the connecting rod 4 and is fixedly mounted above the support platform 9. The clamping pin 41 is sleeved on the end of the connecting rod 4 and has a protrusion 42 corresponding to the mounting shaft of the workpiece.

[0031] Furthermore, the drive assembly includes a cylinder 1, a V-shaped plate 2, a steel ball 3, and a floating joint 21. The cylinder 1 is located above the support platform 9, and the V-shaped plate 2 is located inside the support plate 91, directly below the cylinder 1. The support plate 91 has a sliding channel 911 for the V-shaped plate 2 to move up and down. The steel ball 3 is located on both sides of the V-shaped plate 2. The V-shaped plate 2 has through holes 22 corresponding to the shape of the floating joint 21. The floating joint 21 is snapped into the V-shaped plate 2. A push column 11 is fixedly installed at the lower end of the cylinder 1. The floating joint 21 has through holes 22 corresponding to the push column 11. The support plate 91 has a sliding channel 912 for the steel ball 3 to move left and right.

[0032] Furthermore, the centering clamping mechanism also includes a reset assembly, which includes a spring 5, a spring support rod 51, and a limiting member. The spring support rod 51 is located inside the support plate 91. There are two springs 5, which are respectively sleeved on both ends of the spring support rod 51. The two ends of the spring support rod 51 are connected to fixing blocks 52. The fixing blocks 52 are detachably connected to both ends of the support plate 91. One end of the spring 5 is fixedly connected to the fixing block 52. The end of the connecting rod 4 is provided with a through hole. The diameter of the through hole is larger than the cross-section of the spring support rod 51. The connecting rod 4 is sleeved on the middle part of the spring support rod 51.

[0033] Furthermore, the centering clamping mechanism mounting base 913 and the sensor 8 are provided. The mounting base 913 is fixedly mounted on the support plate 91, and the shape of the mounting base 913 corresponds to the mounting axis of the workpiece. The sensor 8 is located below the mounting base 913.

[0034] The working process of this utility model: Centering and clamping process: The workpiece is placed on the workpiece base. When the sensor 8 detects that a workpiece is placed on the workpiece base 7, the cylinder 1 performs a downward thrust, which pushes the floating joint 21 and the V-shaped plate 2 downward in sequence. The steel balls 3 on both sides of the V-shaped plate 2 are squeezed and move to both sides along the slide channel. The steel balls 3 push the connecting rod 4 to rotate around the connecting rod shaft 61. That is, the connecting rod 4 and the spring support rod 51 are connected at the end of the spring support rod 51 and move to both ends. The two connecting rods 4 are sleeved at one end of the spring support rod 51 and gradually move away from each other. The spring 5 is compressed. The end of the connecting rod 4 close to the workpiece base 7 moves towards the workpiece. The end of the connecting rod 4 close to the workpiece base 7 gradually moves closer. The protrusions 42 of the clamping pins 41 at both ends gradually embed into the mounting shaft of the workpiece. Under the clamping force of the connecting rod 4 and the clamp 71, the workpiece is clamped and centered.

[0035] Reset process: After the workpiece is processed, the control cylinder 1 rises, and the elastic force of the spring 5 pushes the connecting rod 4 to rotate around the connecting rod shaft 61. The end of the connecting rod 4 that is sleeved with the spring support rod 51 moves towards the center on the spring support rod 51. The end of the connecting rod 4 that is sleeved with the spring support rod 51 gradually approaches, pushing the steel balls 3 on both sides to move inward. The end of the connecting rod 4 that is close to the workpiece base 7 moves away from the workpiece. The end of the connecting rod 4 that is close to the workpiece base 7 gradually moves away, and the clamping pin 41 gradually disengages from the mounting shaft of the workpiece, allowing the workpiece to be removed. At the same time, the steel balls 3 push the V-shaped plate 2 upward under the push of the connecting rod 4. At this point, the fixture returns to its initial state before the workpiece is placed.

[0036] It is understood that this utility model has been described through some embodiments. As those skilled in the art will know, modifications can be made to these features and embodiments to adapt to specific circumstances and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A centering clamping mechanism, comprising a workpiece base (7) and a support platform (9), wherein the support platform (9) is fixedly mounted on a processing equipment, and the workpiece base (7) is snapped into the end of the support platform (9), characterized in that: It also includes a clamping assembly for clamping the workpiece and a driving assembly for driving the clamping assembly to complete the clamping action. A support plate (91) is fixedly provided on the support platform (9). The clamping assembly includes a connecting rod (4), a connecting rod shaft (61) and a clamping pin (41). The connecting rod (4) is slidably disposed in the support plate (91). The connecting rod shaft (61) slides through the connecting rod (4). The connecting rod shaft (61) is fixedly disposed above the support platform (9). The clamping pin (41) is sleeved on the end of the connecting rod (4). The clamping pin (41) is provided with a protrusion (42) corresponding to the mounting shaft of the workpiece.

2. The centering clamping mechanism according to claim 1, characterized in that: The clamping assembly also includes a side positioning seat (6), which is fixedly disposed above the support platform (9). The connecting rod shaft (61) is rotatably disposed inside the side positioning seat (6). The side positioning seat (6) has a channel corresponding to the shape of the end of the connecting rod (4) and the clamping pin (41).

3. The centering clamping mechanism according to claim 2, characterized in that: The drive assembly includes a cylinder (1), a V-shaped plate (2), and a steel ball (3). The cylinder (1) is located above the support platform (9). The V-shaped plate (2) is located inside the support plate (91) and is directly below the cylinder (1). The support plate (91) has a sliding channel (911) for the V-shaped plate (2) to move up and down. The steel ball (3) is located on both sides of the V-shaped plate (2). The support plate (91) has a sliding channel (912) for the steel ball (3) to move left and right.

4. A centering clamping mechanism according to claim 3, characterized in that: The drive assembly also includes a floating joint (21), and the V-shaped plate (2) has a through hole (22) corresponding to the shape of the floating joint (21). The floating joint (21) is snapped into the V-shaped plate (2). A push column (11) is fixedly provided at the lower end of the cylinder (1). The floating joint (21) has a through hole (22) corresponding to the push column (11).

5. A centering clamping mechanism according to claim 4, characterized in that: It also includes a reset assembly, which includes a spring (5), a spring support rod (51) and a limiting member. The spring support rod (51) is located inside the support plate (91). The number of springs (5) is set to 2. The two springs (5) are respectively sleeved on both ends of the spring support rod (51). The two ends of the spring support rod (51) are detachably connected to the two ends of the support plate (91). The end of the connecting rod (4) is sleeved on the middle part of the spring support rod (51).

6. A centering clamping mechanism according to claim 5, characterized in that: It also includes a mounting base (913) and a sensor (8). The mounting base (913) is fixed on the support plate (91). The shape of the mounting base (913) corresponds to the mounting axis of the workpiece. The sensor (8) is located below the mounting base (913).

7. A centering clamping mechanism according to claim 6, characterized in that: The spring support rod (51) has fixed blocks (52) connected to both ends. The fixed blocks (52) are detachably connected to both ends of the support plate (91). One end of the spring (5) is fixedly connected to the fixed blocks (52).

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