Cam forced shearing mechanism

Abstract

The cam forced shearing mechanism designed in the present invention is designed to use a conjugate cam group to push the humanoid pendulum and cooperate with the tool hole on the shear plate to perform shearing. The structure of the conjugate cam group and the humanoid pendulum makes the swing trajectory of the humanoid pendulum more stable. The mechanism is also designed with a grasping mechanism to grasp the metal wire. The grasping mechanism also drives the grasping action through the conjugate cam group. The design structure is ingenious and streamlined. The grasping mechanism is provided with a middle clamping plate that is close to the shear plate, and a clamping groove is provided on the middle clamping plate. Both sides of the middle clamping plate are provided with manipulators that cooperate with the clamping groove. The clamping groove and the manipulator constitute a three-point stable clamping structure. The clamping mechanism swings back and forth inside and outside the tool hole through the humanoid pendulum to force shearing of the metal wire.

Description

Technical Field

[0001] The invention relates to an actuator, in particular to a cam forced shearing mechanism. Background Art

[0002] Cold heading machine is a special mechanical equipment mainly used for batch production of nuts, bolts and other fasteners.

[0003] The overall structure of the existing cold heading machine can be divided into five parts according to its function: the main transmission mechanism, the feeding mechanism, the shearing mechanism, the cold heading forming mechanism, and the ejection and blanking mechanism. During the wire processing of the cold heading machine, the metal wire is fed into the shearing mechanism under the action of the feeding mechanism. After the shear plate of the shearing mechanism shears the metal blank of a preset length, the metal blank is then fed into the cold heading forming mechanism for plastic forming by a clamping manipulator. During this entire process, since some cold heading machines produce thinner wires and their production cycles are also faster, the feeding rhythm of their feeding mechanisms is also faster. Therefore, the shearing mechanism of the traditional structure may not be able to adapt to its shearing speed, which will seriously affect the processing efficiency and processing progress of the cold heading machine. It is necessary to provide a new shearing mechanism. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a cam forced shearing mechanism which is suitable for thin metal wires, has a fast shearing rhythm and an adjustable processing speed.

[0005] To achieve the above-mentioned objectives, the present invention provides a cam-forced shearing mechanism comprising a conjugate cam assembly, an anthropomorphic rocker, and a shearing device. The conjugate cam assembly comprises a conjugate main cam, a conjugate secondary cam, and a conjugate shearing cam; the shearing device comprises a shear plate and a gripping mechanism, wherein the shear plate is provided with a tool hole; a rotating shaft is connected to the middle intersection of the anthropomorphic rocker, which is connected to the shear plate; one of the rockers of the anthropomorphic rocker is a shearing rocker; the conjugate main cam and the conjugate secondary cam cooperate with the anthropomorphic rocker, so that the shearing rocker is closely attached to the shear plate and swings back and forth in and out of the tool hole; the gripping mechanism cooperates with the conjugate shearing cam, and the gripping mechanism is fixedly connected to one side of the shearing rocker that is closely attached to the shear plate. When the shearing rocker is closely attached to the shear plate and swings back and forth in and out of the tool hole under the cooperation between the conjugate cam assembly and the anthropomorphic rocker, the gripping mechanism connected to the shearing rocker also swings back and forth with the shearing rocker. When the wire is fed to the gripping mechanism, it is gripped by the gripping mechanism and then sheared into segments under the relative shearing force of the gripping mechanism and the tool hole.

[0006] A further solution is that the gripping mechanism includes a center clamping plate, the bottom end of which is provided with a gripping groove parallel to the axis of the tool hole. The center clamping plate is provided with a manipulator seat on each axial side of the gripping groove, and a manipulator is hingedly connected to the manipulator seat. The two symmetrically distributed manipulators cooperate with the gripping groove to perform the gripping action. The two manipulators and the gripping groove form three stable points to grasp and secure the wire.

[0007] A further solution is that the width of the gripping portion of the manipulator is consistent with the length of the gripping groove. The gripping groove and the manipulator must be close to the shear plate to facilitate wire shearing, and the relative alignment of the gripping groove and the manipulator is conducive to balanced force during the shearing process.

[0008] A further solution is that the manipulator is provided with a push surface at one end away from the gripping portion, the push surface being arranged beside the manipulator seat, the manipulator being arranged on the downward swinging side of the shearing rocker, the shearing rocker being provided with a push rod fixed base plate on the other side opposite to the manipulator, two push rods working in cooperation with the push surface being connected to the push rod fixed base plate, the shearing rocker being provided with push rod holes at positions corresponding to the push rods, the push rod holes being provided with an outward expansion hole on one side of the push rod fixed base plate, and a return spring being arranged in the outward expansion hole. In the working state, downward pressure is applied to the push rod fixed plate, the push rod fixed plate pushes the push rod against the push surface of the manipulator, and the gripping end of the hinged manipulator is closed towards the clamping groove under the action of the thrust, at which time the wire transported to the clamping groove is gripped by the gripping mechanism, and after the thrust on the push rod fixed plate is withdrawn, the return spring pushes the push rod fixed plate back to its original position.

[0009] A further solution is that the gripping mechanism is provided with a corner rocker on a side near the conjugate cam group, with the inner side of the corner of the corner rocker facing the gripping mechanism. An adjustment screw is connected to one end of the corner rocker, and the adjustment screw is arranged above the middle portion of the push rod fixed base plate. The opposite end of the corner rocker with the adjustment screw is hingedly connected to the shear rocker, and the shear rocker is provided with a first avoidance zone at the corner rocker position to avoid the movement of the corner rocker. The end of the corner rocker with the adjustment screw can swing up and down above the push rod fixed plate. Under the action of thrust, the corner rocker applies downward pressure to the push rod fixed plate through the adjustment screw, thereby pushing the push rod fixed plate downward to realize the gripping action of the gripping mechanism. The adjustment screw can adjust the length of its downward protrusion from the corner rocker to limit the push rod fixed plate from being pushed up by the return spring, so that the adjustment screw is always in contact with the push rod fixed plate.

[0010] A further solution is that the conjugate shear cam is provided with a pulling arm on the side close to the grabbing mechanism, and one end of the pulling arm is provided with a shear roller cooperating with the conjugate shear cam, and the other end of the pulling arm is connected to the humanoid rocker arm through a pin shaft, and the pin shaft is fixedly connected to the pulling arm and is rotatably connected to the humanoid rocker arm. The pin shaft is fixedly connected to a fixing clamp at the position of the humanoid rocker arm, and the humanoid rocker arm is provided with a second avoidance area for avoiding the rotation of the fixing clamp. A telescopic pull rod is hinged on one end of the fixing clamp, and the end of the telescopic pull rod opposite to the fixing clamp is hinged to the corner rocker arm, and the connection point between the telescopic pull rod and the corner rocker arm is on the corner of the corner rocker arm. A shear compression spring is sleeved on the telescopic pull rod, and the shear compression spring is connected with a washer on the side close to the humanoid rocker arm, and the washer is pressed on the conjugate secondary cam by the shear compression spring. The conjugate shear cam drives the pulling arm to swing back and forth, and the fixed clamp is driven by the pin shaft driven by the pulling arm to rotate back and forth. The fixed clamp pulls the corner rocker arm to swing back and forth through the telescopic pull rod. The shear spring abuts against the humanoid rocker arm through a gasket. The shear spring enables the telescopic pull rod to automatically adjust its length to adapt to the distance change of the corner rocker arm in the pulling direction. The cam-forced shearing mechanism designed in the present invention utilizes a conjugate cam group to propel a humanoid pendulum, which cooperates with a tool hole on a shear plate to perform shearing. The combination of the conjugate cam group and the humanoid pendulum stabilizes the pendulum's swing trajectory. The mechanism also incorporates a gripping mechanism to grasp the metal wire, which is also driven by the conjugate cam group. This cleverly designed, streamlined structure features a central clamping plate that abuts the shear plate, with a clamping groove formed on each side. Manipulators that cooperate with the clamping grooves are located on both sides of the central clamping plate. The clamping grooves and manipulators form a three-point, stable gripping structure. The gripping mechanism uses the humanoid pendulum to swing back and forth within and outside the tool hole, thereby forcibly shearing the metal wire. The cam-forced shearing mechanism can control the shearing speed by controlling the rotational speed of the conjugate cam group's rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of Example 1;

[0012] Figure 2 is a cross-sectional view of the grabbing mechanism in Example 1;

[0013] Figure 3 yes Figure 2 A partial enlarged view of middle A;

[0014] Figure 4 It is a structural diagram of the manipulator part in Example 1;

[0015] Figure 5 is a schematic structural diagram of the shearing device in Example 1;

[0016] Figure 6This is a cross-sectional view of the shearing device in Example 1. DETAILED DESCRIPTION

[0017] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0018] Example 1.

[0019] like Figure 1 As shown, the cam forced shearing mechanism described in this embodiment includes a conjugate cam group 1, a humanoid rocker 2 and a shearing device 3, wherein the conjugate cam group 1 includes a conjugate main cam 11, a conjugate auxiliary cam 12 and a conjugate shearing cam 13; the shearing device 3 includes a shearing plate 31 and a gripping mechanism 4, and the shearing plate 31 is provided with a tool hole 311; the middle intersection of the humanoid rocker 2 is connected with a rotating shaft 21, and the rotating shaft 21 is connected to the shearing plate 31, and one of the rockers of the humanoid rocker 2 is a shearing rocker 22; the conjugate main cam 11 and the conjugate auxiliary cam 12 cooperate with the humanoid rocker 2, so that the shearing rocker 22 is close to the shearing plate 31 and swings back and forth in and out of the tool hole 311; the gripping mechanism 4 cooperates with the conjugate shearing cam 13, and the gripping mechanism 4 is fixedly connected to the shearing rocker 22 and is close to one side of the shearing plate 31.

[0020] like Figure 4 As shown, the gripping mechanism 4 includes a center plate 41. The bottom end of the center plate 41 is provided with a gripping groove 411 parallel to the axis of the tool hole 311. The center plate 41 is provided with a manipulator seat 42 on each axial side of the gripping groove 411. A manipulator 43 is hingedly connected to the manipulator seat 42. The two symmetrically distributed manipulators 43 cooperate with the gripping groove 411 to complete the gripping action. The width of the manipulator 43 at its gripping portion is consistent with the length of the gripping groove 411.

[0021] like Figure 3 As shown, the manipulator 43 is provided with a push surface 431 at the end away from the grasping part, and the push surface 431 is arranged on the side of the manipulator seat 42. The manipulator 43 is arranged on the downward swinging side of the shear rocker 22. The shear rocker 22 is provided with a push rod fixed bottom plate 44 on the other side opposite to the side of the manipulator 43. Two push rods 45 that cooperate with the push surface 431 are connected to the push rod fixed bottom plate 44. The shear rocker 22 is provided with a push rod hole 46 at a position corresponding to the push rod 45. The push rod hole 46 is provided with an outward expansion hole 461 on one side of the push rod fixed bottom plate 44, and a return spring 47 is provided in the outward expansion hole 461.

[0022] like Figure 3 、 Figure 6As shown, the gripping mechanism 4 is provided with a corner rocker 48 on the side close to the conjugate cam group 1, and the inner side of the corner of the corner rocker 48 faces the gripping mechanism 4. An adjusting screw 49 is connected to one end of the corner rocker 48, and the adjusting screw 49 is arranged above the middle of the push rod fixed base plate 44. The opposite end of the corner rocker 48 with the adjusting screw 49 is hingedly connected to the shear rocker 22, and the shear rocker 22 is provided with a first avoidance area 221 at the position of the corner rocker 48 for avoiding the movement of the corner rocker 48.

[0023] like Figure 2 、 Figure 6 As shown, the conjugate shear cam 13 is provided with a pulling arm 51 on the side close to the grabbing mechanism 4, and a shear roller 52 cooperating with the conjugate shear cam 13 is provided at one end of the pulling arm 51, and the other end of the pulling arm 51 is connected to the humanoid rocker 2 through a pin shaft 53, and the pin shaft 53 is fixedly connected to the pulling arm 51 and is rotatably connected to the humanoid rocker 2. The pin shaft 53 is fixedly connected to a fixing clamp 54 at the position of the humanoid rocker 2, and a second avoidance area is provided on the humanoid rocker 2 to avoid the rotation of the fixing clamp 54. A telescopic pull rod 55 is hinged on one end of the fixing clamp 54, and the end of the telescopic pull rod 55 opposite to the fixing clamp 54 is hinged to the corner rocker 48. The connection point between the telescopic pull rod 55 and the corner rocker 48 is on the corner of the corner rocker 48, and a shear compression spring 56 is sleeved on the telescopic pull rod 55. A washer 57 is connected to the side close to the humanoid rocker 2 , and the washer 57 is pressed onto the conjugate auxiliary cam 12 by the shear compression spring 56 .

[0024] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A cam forced shearing mechanism, comprising a conjugate cam group (1), a humanoid rocker (2) and a shearing device (3), characterized in that: The conjugate cam group (1) includes a conjugate main cam (11), a conjugate auxiliary cam (12) and a conjugate shearing cam (13); the shearing device (3) includes a shearing plate (31) and a grabbing mechanism (4), and the shearing plate (31) is provided with a tool hole (311); the middle intersection of the humanoid pendulum (2) is connected to a rotating shaft (21), and the rotating shaft (21) is connected to the shearing plate (31), and one of the pendulums of the humanoid pendulum (2) is a shearing pendulum (22); the conjugate main cam (11) and the conjugate auxiliary cam (12) cooperate with the humanoid pendulum (2), so that the shearing pendulum (22) is closely attached to the shearing plate (31) and swings back and forth in and out of the tool hole (311); the grabbing mechanism (4) cooperates with the conjugate shearing cam (13), and the grabbing mechanism (4) is fixedly connected to the shearing pendulum (22) on one side close to the shearing plate (31); The gripping mechanism (4) includes a middle clamping plate (41), the bottom end of the middle clamping plate (41) is provided with a gripping groove (411) parallel to the axis of the tool hole (311), the middle clamping plate (41) is provided with a manipulator seat (42) on both sides of the axial direction of the gripping groove (411), a manipulator (43) is hingedly connected to the manipulator seat (42), and the two symmetrically distributed manipulators (43) cooperate with the gripping groove (411) to complete the gripping action; The width of the manipulator (43) at its gripping portion is consistent with the length of the gripping groove (411); The manipulator (43) is provided with a push surface (431) at one end thereof away from the grasping portion, and the push surface (431) is provided on the side of the manipulator seat (42). The manipulator (43) is provided on the side of the shearing rocker (22) that swings downward. The shearing rocker (22) is provided with a push rod fixed bottom plate (44) on the other side opposite to the manipulator (43). Two push rods (45) that cooperate with the push surface (431) are connected to the push rod fixed bottom plate (44). The shearing rocker (22) is provided with a push rod hole (46) at a position corresponding to the push rod (45). The push rod hole (46) is provided with an outer expansion hole (461) on one side of the push rod fixed bottom plate (44), and a return spring (47) is provided in the outer expansion hole (461). The gripping mechanism (4) is provided with a corner rocker (48) on a side close to the conjugate cam group (1), the inner side of the corner of the corner rocker (48) faces the gripping mechanism (4), an adjusting screw (49) is connected to one end of the corner rocker (48), the adjusting screw (49) is arranged above the middle of the push rod fixed base plate (44), the opposite end of the corner rocker (48) with the adjusting screw (49) is hingedly connected to the shear rocker (22), and the shear rocker (22) is provided with a first avoidance area (221) at the position of the corner rocker (48) for avoiding the movement of the corner rocker (48).

2. The cam forced shearing mechanism according to claim 1, characterized in that: The conjugate shearing cam (13) is provided with a pulling arm (51) on a side close to the grabbing mechanism (4), and one end of the pulling arm (51) is provided with a shearing roller (52) that matches the conjugate shearing cam (13). The other end of the pulling arm (51) is connected to the humanoid pendulum (2) through a pin (53). The pin (53) is fixedly connected to the pulling arm (51) and is rotatably connected to the humanoid pendulum (2). The pin (53) is fixed at the position of the humanoid pendulum (2). A fixing clamp (54) is connected, and a second avoidance area for avoiding the rotation of the fixing clamp (54) is provided on the humanoid swing rod (2). A telescopic pull rod (55) is hingedly connected to one end of the fixing clamp (54). The end of the telescopic pull rod (55) opposite to the fixing clamp (54) is hingedly connected to the corner swing rod (48). The connection point between the telescopic pull rod (55) and the corner swing rod (48) is at the corner of the corner swing rod (48). A shear compression spring (56) is sleeved on the telescopic pull rod (55). The shear compression spring (56) is connected to a washer (57) on the side close to the humanoid swing rod (2). The washer (57) is pressed on the conjugate secondary cam (12) by the shear compression spring (56).

Images