Half-stroke die front material blocking mechanism

Abstract

The invention relates to the field of cold headers, in particular to a half-stroke die-front material blocking mechanism which comprises a die blocking mechanism body and further comprises a die blocking part arranged between adjacent die bases in the initial state. The first power input part receives power to drive the mold blocking part to do linear motion in the power input direction; the power conversion part is movably connected with the mold blocking part, and the power conversion part converts linear motion of the mold blocking part into rotary motion around the axis of the power conversion part; the reset assembly is movably connected to the connecting position of the die blocking part and the power conversion part, when the first power input part does not receive power, the reset assembly drives the die blocking part to reset, rotation deviation of the reset assembly does not occur in the movement process, the minimum displacement in the clamping state of the mechanical arm is not interfered, the material blocking action time is shortened, and the work efficiency is improved. And the normal whole course of the working face of the mold blocking mechanism is constant, mechanical structure redundancy is greatly reduced, and the matching synchronization error is lower.

Description

Technical Field

[0001] This invention relates to the field of cold heading machines, and more particularly to a half-stroke die front stop mechanism. Background Technology

[0002] Cold heading machines are high-speed pressure equipment widely used for the mass production of metal products such as fasteners and shaft parts. Their working cycle includes feeding, clamping, upsetting, and unloading, requiring each actuator to have high cycle time, high synchronization, and high positioning accuracy. In the cold heading process, the pre-die stop mechanism, as a key auxiliary unit, is located in front of the die. It axially limits the ejection position of short parts after upsetting, ensuring the product does not fall before the robot arm picks it up; simultaneously, it must retract promptly after the robot arm picks up the material to avoid motion interference. Therefore, the timing, displacement accuracy, and structural reliability of this mechanism directly affect the overall production efficiency and yield of the machine.

[0003] Existing die-gutter mechanisms mostly adopt pneumatic / motor-driven linear reciprocating structures; however, this approach still has significant technical problems in practical high-speed cold heading applications. Existing die-mounted stop mechanisms generally employ single-degree-of-freedom guiding structures, such as sliders and guide rail pairs. While these achieve displacement, they cannot fully constrain the overturning moment of the stop plate about the feed axis. Especially under conditions of high-pressure oil mist and vibration in front of the die, the guide rail clearance can easily cause the stop plate to rotate slightly, resulting in dynamic drift of its working surface normal orientation. In addition, to avoid the gripper of the robotic arm, a full-stroke retraction is often required, far exceeding the actual clearance requirement. This not only prolongs the single stop cycle but also exacerbates guide rail wear due to repeated large displacement movements, creating a vicious cycle of large displacement, long time, rapid wear, increased clearance, orientation deviation, and poor positioning. Ultimately, this leads to the problem of scraping and impacting the die in the forging product. Moreover, existing technologies use separately configured dedicated cylinders or servo motors to form a point-to-point control mode of "one mechanism and one drive". This not only increases equipment cost and space occupation and creates mechanical redundancy, but also requires the upper controller to perform timing compensation calculations for the material blocking action and the robot's gripping cycle due to pneumatic response delay or servo communication cycle limitations. Once the parameters drift or the signal is interfered with, there is a high risk that the material blocking will not be fully retracted before the material picking movement is triggered and interferes with each other. In addition, a large number of electronic control components are exposed to harsh environments such as oil mist, which significantly reduces the system's MTBF and results in a high frequency of on-site maintenance. Summary of the Invention

[0004] This application provides a half-stroke die front stop mechanism to solve at least one of the above-mentioned problems in the prior art, and adopts the following technical solution: A half-stroke die front stop mechanism includes a die stop mechanism, and further includes: a die stop portion, which is initially disposed between adjacent die holders; a first power input portion, which receives power to drive the die stop portion to perform linear motion along the power input direction; a power conversion portion, which is movably connected to the die stop portion, and which converts the linear motion of the die stop portion into rotational motion about the axis of the power conversion portion; and a reset assembly, which is movably connected at the connection between the die stop portion and the power conversion portion, and when the first power input portion does not receive power, the reset assembly drives the die stop portion to reset.

[0005] Preferably, the power conversion unit and the mold stop unit cooperate to form a parallelogram mechanism, and the power conversion unit makes the mold stop unit maintain its own translational characteristics when converting the movement path of the mold stop unit.

[0006] Preferably, the power conversion unit includes a first fixed seat, a first crank, and a second crank. The first fixed seat and the mold stop are provided with movable holes, and a rotating shaft is provided on the movable holes. The first crank and the second crank are movably connected to the first fixed seat and the mold stop respectively through the rotating shaft and the movable holes.

[0007] Preferably, the reset assembly includes a second fixed seat and a spring core rod. One end of the spring core rod is movably connected to the connection between the mold stop and the power conversion part via a rotating shaft. A spring is provided between the spring core rod and the second fixed seat, and one end of the spring is fixedly connected to the second fixed seat.

[0008] Preferably, the second fixing seat has a through hole, the spring core is movably disposed in the through hole, and the diameter of the spring is larger than that of the through hole.

[0009] Preferably, the mold stop includes a mounting base, which is fixedly connected to the first power input part, and a baffle plate is mounted on the mounting base.

[0010] Preferably, the baffle plate is provided with a bending structure, which enables the baffle plate to undergo slight deformation under external force.

[0011] Preferably, it further includes: a robotic arm support, on which a second power input part is provided; and a power transmission part, which is fixedly connected to the robotic arm support, wherein the power transmission part has a half-stroke gap with the first power input part in the initial state, and the power transmission part abuts against the first power input part and transmits power to the first power input part during movement.

[0012] Preferably, the robotic arm support includes a robotic arm mounting base and a mounting frame, wherein the mounting frame is movably connected to the robotic arm mounting base via a connector and forms a parallelogram mechanism.

[0013] Preferably, the connecting component includes a rocker arm and a rotating shaft. The rocker arm is respectively disposed at both ends of the robotic arm fixing seat, and the two ends of the rocker arm are movably connected to the robotic arm fixing seat and the mounting frame respectively through the rotating shaft.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The front stop mechanism of the mold forms a parallelogram mechanism through the power conversion unit and the mold stop unit. The preset half-stroke distance between the power transmission unit and the first power input unit, the parallelogram mechanism makes the mold stop unit maintain translational characteristics, so that the stop plate itself will not rotate or deviate during the movement. Combined with the half-stroke distance limit, the stop plate achieves minimal displacement during the movement without interfering with the gripper of the robot, avoiding the time spent on the full stroke movement, reducing the stopping action time, and the normal of the working surface of the stop plate remains constant throughout the entire movement, without changing the posture due to the movement, resulting in secondary positioning errors, and the positioning is more accurate.

[0015] 2. The die-cutting mechanism forms a disengaging contact with the first power input unit through the power transmission unit. The reset and component provide directional reset, eliminating the need for a separate cylinder or motor and matching solenoid valve or encoder used in the die-cutting mechanism in the prior art. This effectively reduces the redundancy of the mechanical structure, reduces the number of failure points during equipment operation, and provides pure mechanical rigid transmission. The synchronization error between the die-cutting mechanism and the robot is lower. There is no need for an additional controller to calculate the running time of the die-cutting mechanism, and it effectively reduces maintenance costs. Since no electrical components are exposed to the stamping oil mist environment, the MTBF (Mean Time Between Failures) is effectively improved.

[0016] 3. The front stop mechanism integrates a preset bending structure through the stop plate body, and the material itself has a certain elasticity, so it can achieve recoverable micro deformation, avoiding the workpiece edge curling or stop plate breakage caused by traditional rigid stop, providing clearance space for the robot, solving the industry pain point of material picking failure caused by excessively tight stop, and eliminating the need for additional adjustment mechanisms. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of the present invention. For those skilled in the art, other embodiments and their accompanying drawings can be obtained based on the embodiments shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the mold block mechanism of the present invention; Figure 2 This is a schematic diagram of the structure of the mold stop part of the present invention; Figure 3 This is a schematic diagram of the power conversion unit of the present invention; Figure 4 This is a schematic diagram of the structure of the reset component of the present invention; Figure 5 This is an exploded view of the robotic arm support portion of the present invention; Figure 6 This is a schematic diagram of the state of the robotic arm support part of the present invention in its initial position; Figure 7 This is a schematic diagram of the state of the robotic arm support part of the present invention when it is in the half-stroke position; Figure 8 This is a schematic diagram of the state of the drive block mechanism of the robotic arm support part of the present invention completing half stroke operation; Figure 9 This is a schematic diagram of the structure of the present invention assembled on a cold heading machine.

[0019] Reference numerals: 1. Mold stop mechanism; 101. Mold stop part; 111. Mounting base; 112. Material stop plate; 102. First power input part; 103. Power conversion part; 131. First fixed base; 132. First crank; 133. Second crank; 104. Reset assembly; 141. Second fixed base; 142. Spring core rod; 143. Spring; 2. Robot arm support part; 201. Power transmission part; 202. Robot arm fixed base; 203. Mounting bracket; 204. Rocker arm; 205. Second power input part. Detailed Implementation

[0020] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] An embodiment of the present invention provides a half-stroke die front stop mechanism. Example

[0024] like Figure 1 As shown: A half-stroke die front stop mechanism includes a die stop mechanism 1, and further includes: a die stop part 101, which is initially disposed between adjacent die bases, and forms a half-stroke motion relative to the die during the movement; a first power input part 102, which receives power to drive the die stop part 101 to perform linear motion along the power input direction; a power conversion part 103, which is movably connected to the die stop part 101, and converts the linear motion of the die stop part 101 into rotational motion around the axis of the power conversion part 103; and a reset assembly 104, which is movably connected at the connection between the die stop part 101 and the power conversion part 103, and drives the die stop part 101 to reset when the first power input part 102 does not receive power. This solution addresses the interference between the die pre-stopping motion and the robot's material handling stroke in automated stamping production lines. Traditional full-stroke pre-stopping mechanisms require complete retraction from the die area, leading to extended cycle times; while fixed pre-stopping mechanisms are prone to collisions with the workpiece / robot. This solution, through a "half-stroke + translational reset" design, maintains the pre-stopping positioning reference while only retracting from the critical interference zone, balancing safety and efficiency.

[0025] The mold stop part 101 includes a mounting base 111, which is fixedly connected to the first power input part 102, and a baffle plate 112 is mounted on the mounting base 111.

[0026] The baffle plate 112 is equipped with a bending structure, which allows the baffle plate 112 to undergo slight deformation under external force. During processing, when the material in the mold is pushed out, the material abuts against the baffle plate 112. When the bending structure is subjected to the force of the material pushing out, it undergoes slight deformation to effectively relieve the force and leave space for the robot to hold the material, preventing the material from being blocked too tightly and the robot from being unable to work. After the material leaves, it automatically returns to its original position by its own bending structure and the springback of the material, without the need for manual intervention.

[0027] like Figure 2As shown, the power conversion unit 103 and the die stop unit 101 cooperate to form a parallelogram mechanism. When converting the movement path of the die stop unit 101, the power conversion unit 103 ensures that the die stop unit 101 maintains its translational characteristics. This translational characteristic ensures that the normal direction of the working surface of the stop plate 112 remains constant throughout the entire movement, avoiding scratches with the side wall of the die holder or jamming with the edge of the workpiece due to posture deflection. This is especially suitable for the stringent requirements of high-precision thin plate stamping scenarios where there are no scratches on the surface.

[0028] like Figure 3 As shown: The power conversion unit 103 includes a first fixed base 131, a first crank 132, and a second crank 133. Movable holes are provided on the first fixed base 131 and the mold stop 101, and rotating shafts are provided on the movable holes. The first crank 132 and the second crank 133 are movably connected to the first fixed base 131 and the mold stop 101 respectively through the rotating shafts and the movable holes. The first crank 132 and the second crank 133 are of equal length and arranged parallel to each other. Each rotating shaft adopts a clearance fit to ensure smooth movement of the mechanism without over-positioning. The first fixed base 131 is fixed to the mold base by bolts, providing a reliable fulcrum for the parallelogram mechanism.

[0029] like Figure 4 As shown: The reset assembly 104 includes a second fixed base 141 and a spring core 142. One end of the spring core 142 is movably connected to the connection between the mold stop 101 and the power conversion part 103 via a rotating shaft. A spring 143 is provided between the spring core 142 and the second fixed base 141, with one end of the spring 143 fixedly connected to the second fixed base 141. A through hole is provided on the second fixed base 141, and the spring core 142 is movably disposed in the through hole. The diameter of the spring 143 is larger than that of the through hole. The spring 143 is a compression spring, and its free height is greater than the depth of the through hole. During assembly, one end of the spring 143 is fixedly connected to the second fixed base 141, and the other end abuts against the limiting step of the spring core 142. When the mold stop 101 moves, the spring 143 is compressed and stores energy. After the power is removed, the elastic potential energy is released to drive the mold stop 101 to move and reset along the original path.

[0030] like Figure 5-9 As shown: It also includes: a robotic arm support 2, on which a second power input 205 is provided; and a power transmission 201, which is fixedly connected to the robotic arm support 2. In its initial state, the power transmission 201 has a half-stroke gap with the first power input 102, the half-stroke gap being half the distance between adjacent molds. The full stroke is from one mold to another. When the robotic arm support 2 moves, it is a full-stroke movement. When the robotic arm support 2 reaches the half-stroke position, it drives the mold stop mechanism 1 to operate synchronously for the second half of the stroke. During movement, the power transmission 201 comes into contact with the first power input 102 and transmits power to it. Power is transmitted to the first power input unit 102 through the power transmission unit 201, so that the robot arm support unit 2 and the mold blocking mechanism 1 can use a common power source, effectively reducing the redundancy of equipment components. The half-stroke distance set between the power transmission unit 201 and the first power input unit 102 in the initial state allows the mold blocking mechanism 1 to only retract to the minimum safe position (i.e., "half stroke") that does not interfere with the robot arm's material picking and placing, rather than retracting from the mold area for the entire stroke. When the robot arm completes the material picking and placing and retracts, the power transmission unit 201 simultaneously disengages from the first power input unit 102, and the mold blocking mechanism 1 automatically resets to the initial blocking position under the action of the reset component 104. No independent drive source and position sensor are required throughout the process, which significantly simplifies the complexity of the control system and improves cycle efficiency.

[0031] The robotic arm support 2 includes a robotic arm mounting base 202 and a mounting frame 203. The mounting frame 203 is movably connected to the robotic arm mounting base 202 via a connector, forming a parallelogram mechanism. The connector includes rocker arms 204 and rotating shafts. The rocker arms 204 are respectively located at both ends of the robotic arm mounting base 202, and both ends of the rocker arms 204 are movably connected to the robotic arm mounting base 202 and the mounting frame 203 respectively via rotating shafts. This parallelogram mechanism ensures that the mounting frame 203 maintains a horizontal posture and keeps consistent with the movement trajectory of the mold stop mechanism 1 during movement, ensuring that the contact surfaces of the second power input unit 205 and the first power input unit 102 are always parallel, avoiding transmission vibration or wear caused by lateral forces; the power transmission process is a pure rigid contact with no hydraulic / pneumatic delay, resulting in higher synchronization accuracy.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims, not by the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A half-stroke die front stop mechanism, comprising a die stop mechanism (1), characterized in that, Also includes: A mold stop (101) is provided between adjacent mold bases in the initial state; The first power input unit (102) receives power to drive the module stop unit (101) to move linearly along the power input direction; The power conversion unit (103) is movably connected to the mold stop (101), and the power conversion unit (103) converts the linear motion of the mold stop (101) into rotational motion around the axis of the power conversion unit (103). A reset component (104) is movably connected at the connection between the mold stop (101) and the power conversion unit (103). When the first power input unit (102) does not receive power, the reset component (104) drives the mold stop (101) to reset.

2. The half-stroke die front stop mechanism according to claim 1, characterized in that: The power conversion unit (103) and the mold block (101) cooperate to form a parallelogram mechanism. When the power conversion unit (103) converts the movement path of the mold block (101), the mold block (101) maintains its own translational characteristics.

3. The half-stroke die front stop mechanism according to claim 2, characterized in that: The power conversion unit (103) includes a first fixed seat (131), a first crank (132), and a second crank (133). The first fixed seat (131) and the mold stop (101) are provided with movable holes, and the movable holes are provided with rotating shafts. The first crank (132) and the second crank (133) are movably connected to the first fixed seat (131) and the mold stop (101) respectively through the rotating shafts and the movable holes.

4. The half-stroke die front stop mechanism according to claim 1, characterized in that: The reset assembly (104) includes a second fixed seat (141) and a spring core (142). One end of the spring core (142) is movably connected to the connection between the mold stop (101) and the power conversion part (103) via a rotating shaft. A spring (143) is provided between the spring core (142) and the second fixed seat (141). One end of the spring (143) is fixedly connected to the second fixed seat (141).

5. A half-stroke die front stop mechanism according to claim 4, characterized in that: The second fixing seat (141) has a through hole, the spring core rod (142) is movably disposed in the through hole, and the diameter of the spring (143) is larger than that of the through hole.

6. The half-stroke die front stop mechanism according to claim 1, characterized in that: The mold stop (101) includes a mounting base (111), which is fixedly connected to the first power input part (102), and a baffle plate (112) is mounted on the mounting base (111).

7. A half-stroke die front stop mechanism according to claim 6, characterized in that: The baffle plate (112) is provided with a bending structure, which enables the baffle plate (112) to undergo slight deformation under external force.

8. A half-stroke die front stop mechanism according to any one of claims 1-7, characterized in that, Also includes: The robotic arm support (2) is provided with a second power input unit (205). The power transmission unit (201) is fixedly connected to the robot arm support unit (2). In the initial state, the power transmission unit (201) has a half-stroke gap with the first power input unit (102). During the movement, the power transmission unit (201) abuts against the first power input unit (102) and transmits power to the first power input unit (102).

9. A half-stroke die front stop mechanism according to claim 8, characterized in that: The robotic arm support (2) includes a robotic arm mounting base (202) and a mounting frame (203). The mounting frame (203) is movably connected to the robotic arm mounting base (202) via a connector and forms a parallelogram mechanism.

10. A half-stroke die front stop mechanism according to claim 9, characterized in that: The connector includes a rocker arm (204) and a rotating shaft. The rocker arm (204) is respectively located at both ends of the robotic arm fixing seat (202). The two ends of the rocker arm (204) are movably connected to the robotic arm fixing seat (202) and the mounting bracket (203) respectively through the rotating shaft.

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