Spring machine push core and push pitch combination device

Abstract

The application discloses a spring machine push core and push pitch combined device, which comprises a core rod seat, a core rod, a push pitch mechanism and a push core mechanism. The push pitch mechanism drives a screw rod through a first servo motor, drives a threaded sleeve and an execution element to move along the core rod in the axial direction accurately, realizes electric control pitch adjustment, and improves the adjustment convenience and control precision. The push core mechanism is composed of upper and lower symmetrical swing seats and a cam driving assembly, drives two top rods surrounding the core rod to swing synchronously, and ensures the height consistency and stability of the supporting action. The device effectively solves the problems of inconvenient adjustment and poor synchronism of the traditional spring machine.

Description

Technical Field

[0001] This application relates to the technical field of spring machines, and more specifically, to a combination device for a pusher core and push pitch of a spring machine. Background Technology

[0002] In the field of spring manufacturing, the push-pitch and push-core mechanisms of spring coiling machines are core components ensuring spring precision, but related technologies have significant shortcomings in both aspects. Traditional push-pitch mechanisms, whether driven by mechanical cams with fixed motion laws or by pneumatic drives that are susceptible to external interference, struggle to balance ease of adjustment with control precision. Mechanical cams require replacement or regrinding when changing spring pitch parameters, a cumbersome process, while pneumatic drives are difficult to achieve high-precision, especially stable, control of small pitches due to pressure fluctuations. Meanwhile, current push-core mechanisms typically employ two sets of push rods controlled by independent drive sources. This dual-drive design not only increases structural complexity and manufacturing costs but also, due to persistent synchronization errors during high-speed operation, affects the stability of the push rods' support for the wire, thus hindering further improvements in spring forming quality and equipment efficiency. Utility Model Content

[0003] In order to address the problem that the push-pitch mechanism of the spring coiling machine is difficult to balance between ease of adjustment and control precision, and that the synchronization error of the push-core mechanism is difficult to eliminate, which affects the stability of the push rod supporting the wire, this application provides a push-core and push-pitch combination mechanism for a spring coiling machine.

[0004] A spring pressing and pitch pushing combination device includes a mandrel seat, a mandrel disposed on the mandrel seat, a pitch pushing mechanism disposed on one side of the mandrel seat, and a pressing mechanism disposed on the other side of the mandrel seat. The pitch pushing mechanism includes a mounting base, a first servo motor, a lead screw, a threaded sleeve, and an actuator. The lead screw is rotatably connected to the mounting base, and its length direction is parallel to the axial direction of the mandrel. The threaded sleeve is threaded onto the lead screw. The actuator is fixedly connected to the threaded sleeve, and its actuating end is located on one side of the mandrel. The first servo motor is fixed to the mounting base and connected to the lead screw to drive the lead screw to rotate in both directions, causing the actuating end of the actuator to move along the mandrel. The mandrel reciprocates axially. The core-pushing mechanism includes an upper swing seat, a lower swing seat, and a cam drive assembly. The upper and lower swing seats are arranged symmetrically, and the ends of the upper and lower swing seats that are far apart are connected to a rotating shaft. The rotating shaft is parallel to the mandrel. The upper and lower swing seats swing around the rotating shaft. The ends of the upper and lower swing seats that are close to each other are provided with push rods. The end faces of the two push rods are arranged around the axis of the mandrel. The upper and lower swing seats are both connected to the cam drive assembly. The cam drive assembly drives the upper and lower swing seats to swing synchronously, causing the two push rods to move away from or return to the mandrel.

[0005] Preferably, the actuating element includes a connecting frame and a push rod disposed at the end of the connecting frame, the end of the push rod being the actuating end and the actuating end being close to the side wall of the mandrel, and the connecting frame being connected and fixed to the threaded sleeve.

[0006] Preferably, the connecting frame includes a connecting shaft, a connecting block, a guide shaft, and a guide seat. There are two connecting shafts, one end of each connecting shaft is fixedly connected to the threaded sleeve and parallel to the lead screw, and the two connecting shafts are distributed on opposite sides of the lead screw. The two connecting shafts are connected to the connecting block. The side of the connecting block away from the connecting shaft is fixedly connected to one end of the guide shaft. The guide shaft is parallel to the lead screw. The guide seat is provided with a guide hole that matches the guide shaft. The guide shaft slides through the guide hole. The push rod is fixed to the end of the guide shaft away from the connecting block.

[0007] Preferably, there are two guide shafts, two guide holes are provided on the guide seat, the number of push rods corresponds to the number of guide shafts, and each guide shaft is fixed with a push rod by bolts.

[0008] Preferably, both the upper swing seat and the lower swing seat have arc-shaped slots at their ends away from the upper pivot. The arc-shaped slots extend with the pivot as the center, and bolts are inserted into both arc-shaped slots, so that the upper swing seat and the lower swing seat are supported by the bolts.

[0009] Preferably, the cam drive mechanism includes a second servo motor, a camshaft, an upper swing arm, and a lower swing arm. A first hinge shaft is hinged to the middle of the upper swing arm, allowing the upper swing arm to swing around the first hinge shaft. A second hinge shaft is hinged to one end of the lower swing arm, allowing the lower swing arm to swing around the second hinge shaft. An actuating block is provided in the middle of the upper swing arm. One end of the upper swing arm abuts against the top of the actuating block, and the end of the lower swing arm away from the second hinge shaft abuts against the bottom of the actuating block. A hinge joint is provided in the middle of the lower swing arm. The lower swing arm is hinged to the end of the lower swing arm away from the pivot. The camshaft is parallel to the axial direction of the mandrel, and a cam is provided on the camshaft. The end of the upper swing arm away from the actuating block abuts against the peripheral wall of the cam. The second servo motor is connected to the camshaft to drive the camshaft to rotate. The camshaft drives the cam to rotate, causing the upper swing arm to swing and act on the actuating block, thereby causing the upper swing arm to swing. The swing of the upper swing arm causes the actuating block to act on the lower swing arm, causing the lower swing arm to swing and drive the lower swing arm to swing.

[0010] This application includes at least one of the following beneficial technical effects:

[0011] 1. The push-pitch mechanism drives the lead screw to rotate via a first servo motor, which in turn drives the threaded sleeve and the actuator fixed thereto to perform precise linear reciprocating motion along the mandrel axis. This motion converts the servo motor's rotational motion into precise linear displacement through the lead screw and nut pair, making the push-pitch action entirely controlled by an electrical signal program. Compared to traditional mechanical cams, changing the spring pitch parameters requires no hardware replacement, only modification of the program instructions, greatly improving the convenience and flexibility of adjustment. Compared to pneumatic drives, the closed-loop control of the servo motor completely eliminates positional uncertainty caused by pressure fluctuations, enabling stable and high-precision control of minute pitches, fundamentally solving the problem of balancing adjustment convenience and control precision. The push-pitch mechanism uses an upper and lower symmetrically arranged swing seat, synchronously driven by a single cam drive assembly. This allows the two push rods, which are respectively installed at the ends of the upper and lower swing seats, to act as a whole and be driven by the same power source to achieve synchronous opening and resetting. This eliminates the synchronization error that is difficult to avoid with traditional dual independent drive sources, and ensures that the two push rods move in a highly consistent manner when supporting or releasing the wire. This significantly improves the stability and reliability of the support and lays a solid foundation for high-speed and high-precision spring forming.

[0012] 2. A connecting frame is used as an intermediate component. The connecting frame includes a connecting shaft, a connecting block, a guide shaft, and a guide seat. The threaded sleeve is connected to the connecting block through two connecting shafts, forming a stable two-point support, which effectively prevents the connecting frame from twisting or swaying during movement. The guide shaft and the guide hole on the guide seat form a precision sliding pair, which provides strong auxiliary support and precise guidance for the movement of the entire actuator.

[0013] 3. By creating arc-shaped slots at the ends of the upper and lower swing seats furthest from the pivot, and using bolts passing through these slots for support, the upper and lower swing seats achieve stable swinging. The cam drive assembly drives the camshaft and cam to rotate via a second servo motor. The cam's peripheral wall pushes one end of the upper swing arm, forcing it to swing around its first hinge axis. The other end of the upper swing arm presses down on the actuating block, thereby driving the upper swing seat and its push rod to perform a core-pushing action. During this process, the downward pressure of the actuating block simultaneously acts on one end of the lower swing arm, forcing it to swing around its second hinge axis, while the hinge joint in the middle of the lower swing arm pulls the lower swing seat to move synchronously. The cam profile determines the motion curve of the push rod, and the entire transmission chain is rigid and deterministic, avoiding asynchrony. Compared to using two servo motors to drive separately, this reduces costs and control system complexity, ensures absolute synchronization and timing accuracy of the upper and lower push rod movements, and greatly improves the consistency and quality of spring forming. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a spring machine pusher core and push pitch combination device according to this embodiment.

[0015] Reference numerals: 1. Mandrel holder; 2. Mandrel; 3. Pitch pushing mechanism; 31. Mounting base; 32. First servo motor; 33. Lead screw; 34. Threaded sleeve; 35. Actuating element; 351. Connecting frame; 3511. Connecting shaft; 3512. Connecting block; 3513. Guide shaft; 3514. Guide seat; 352. Push rod; 4. Core pushing mechanism; 41. Upper swing seat; 411. Actuating block; 4111. First roller; 4 2. Lower swing arm; 43. Cam drive assembly; 431. Second servo motor; 432. Camshaft; 4321. Cam; 433. Upper swing arm; 4331. First hinge shaft; 4332. Pressing block; 43333. Third roller; 434. Lower swing arm; 4341. Second hinge shaft; 4342. Second roller; 4343. Hinge joint; 44. Rotating shaft; 45. Push rod; 451. Groove; 46. Arc slot; Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] Reference Figure 1 A spring machine's core-pushing and pitch-pushing combination device includes a core holder 1, a core 2, a pitch-pushing mechanism 3, and a core-pushing mechanism 4. The core 2 is mounted on the core holder 1 for central support during spring winding. The pitch-pushing mechanism 3 is located on one side of the core holder 1, and the core-pushing mechanism 4 is located on the other side of the core holder 1. The two work together to ensure the spring's pitch accuracy and the stability of the wire support.

[0018] Reference Figure 1 The pitch-pushing mechanism 3 includes a mounting base 31, a first servo motor 32, a lead screw 33, a threaded sleeve 34, and an actuator 35. The mounting base 31 is fixed to the frame of the spring machine. The lead screw 33 is rotatably connected to the mounting base 31 via bearings, and its length direction is parallel to the axial direction of the mandrel 2. The threaded sleeve 34 is connected to the lead screw 33. The first servo motor 32 is fixed to the mounting base 31 and connected to the lead screw 33 via a coupling, used to drive the lead screw 33 to rotate in both directions. The actuator 35 includes a connecting frame 351 and a push rod 352. The connecting frame 351 includes two connecting shafts 3511, a connecting block 3512, two guide shafts 3513, and a guide seat 3514. One end of each of the two connecting shafts 3511 is fixed to the threaded sleeve 34 and is distributed on opposite sides of the lead screw 33, parallel to the lead screw 33. The other ends of the two connecting shafts 3511 are connected to the connecting block 3512. Two guide shafts 3513 are fixed to one side of the connecting block 3512. The guide shafts 3513 are parallel to the lead screw 33. Two guide holes are opened on the guide seat 3514, and the guide shafts 3513 slide through the guide holes to form a precision sliding pair, providing auxiliary support and precise guidance for the movement of the actuator 35. The push rod 352 is fixed to the end of the guide shaft 3513 by bolts. The actuator end of the push rod 352 is close to the side wall of the mandrel 2 and is used to push the wire to control the spring pitch. When the first servo motor 32 drives the lead screw 33 to rotate, the threaded sleeve 34 moves along the axial direction of the lead screw 33, driving the connecting frame 351 and the push rod 352 to make precise linear reciprocating motion along the axial direction of the mandrel 2. This design converts the rotational motion of the servo motor into linear displacement. The pitch parameter can be adjusted by program control without replacing hardware, achieving high precision and convenient adjustment, and is especially suitable for stable control of small pitches.

[0019] Reference Figure 1The core-pushing mechanism 4 includes an upper swing seat 41, a lower swing seat 42, and a cam drive assembly 43, all supported by a spring and a frame. The upper swing seat 41 and the lower swing seat 42 are arranged symmetrically, with a rotating shaft 44 connected to one end of each swing seat. The rotating shaft 44 is parallel to the core rod 2 and connected to the frame of the spring mechanism via bearings, allowing the upper swing seat 41 and the lower swing seat 42 to swing around the rotating shaft 44. A push rod 45 is provided at the other end of both the upper swing seat 41 and the lower swing seat 42. The end faces of the two push rods 45 are arranged around the axis of the core rod 2 to support the wire, and the ends of the push rods 45 are provided with grooves 451 to accommodate the wire, making the contact between the wire and the push rod 45 more stable. To enhance swing stability, both the upper swing seat 41 and the lower swing seat 42 have arc-shaped slots 46 at their ends furthest from the pivot 44. These slots extend around the pivot 44, and bolts are threaded through each slot, connecting to the frame of the spring machine to provide auxiliary support for the swing seats. The cam drive assembly 43 includes a second servo motor 431, a camshaft 432, an upper swing arm 433, and a lower swing arm 434. The camshaft 432 is axially parallel to the mandrel 2 and connected to the mounting plate via bearings. The second servo motor 431 is connected to the camshaft 432 to drive its rotation. The upper swing arm 433 has a first hinge shaft 4331 rotatably mounted in the middle and is hinged to the frame of the spring machine through the first hinge shaft 4331, so that the upper swing arm 433 can swing around the first hinge shaft 4331; one end of the upper swing arm 433 is provided with a pressing block 4332, and the upper swing seat 41 has an action block 411 fixed in the middle. The top of the action block 411 is rotatably mounted with a first roller 4111 through a bearing, and the pressing block 4332 presses against the first roller 4111. A second hinge shaft 4341 is rotatably mounted at one end of the lower swing arm 434, and is hinged to the frame of the spring machine via the second hinge shaft 4341, allowing the lower swing arm 434 to swing around the second hinge shaft 4341. A second roller 4342 is rotatably mounted at this end of the lower swing arm 434 via a bearing, and the second roller 4342 abuts against the bottom of the actuating block 411. Both the first hinge shaft 4331 and the second hinge shaft 4341 are fixed to the frame of the spring machine and are supported. A hinge joint 4343 is provided in the middle of the lower swing arm 434, and the hinge joint 4343 is hinged to the end of the lower swing seat 42 away from the rotating shaft 44.A cam 4321 is provided on the camshaft 432. A third roller 4333 is rotatably provided at the end of the upper swing arm 433 away from the actuating block 411. The peripheral wall of the cam 432 abuts against the third roller 4333. When the second servo motor 431 drives the camshaft 432 to rotate, the cam 4321 on the camshaft 432 pushes the end of the pressing block 4332 of the upper swing arm 433, causing the upper swing arm 433 to swing around the first hinge axis 4331. Then, through the pressing block 4332 and the first roller 4111, the actuating block 411 is pressed down, driving the upper swing seat 41 to swing around the rotating axis 44, and driving the upper push rod 45 to move. At the same time, the actuating block 411 presses down on the second roller 4342 of the lower swing arm 434, causing the lower swing arm 434 to swing around the second hinge axis 4341. Through the hinge joint 4343, the lower swing seat 42 swings synchronously, driving the lower push rod 45 to move. In this way, the cam drive assembly 43 ensures that the upper and lower swing seats 42 move synchronously through the rigid transmission chain, so that the two push rods 45 move away from or return to the mandrel 2 at the same time, eliminating synchronization error and improving the stability of wire support and spring forming quality.

[0020] The implementation principle of the push-core and push-pitch combination mechanism of the spring machine disclosed in this application is as follows: The movement of the entire mechanism begins with the programmed instructions from the control system to two servo motors. When a spring pitch needs to be formed, the push-pitch mechanism 3 responds immediately: the first servo motor 32 on the mounting base 31 precisely drives the lead screw 33 to rotate according to the preset pulse signal. This rotational motion is converted into linear displacement of the threaded sleeve 34 along the axial direction of the mandrel 2 through the precision lead screw 33 nut pair. The connecting frame 351, which is firmly connected to the threaded sleeve 34, moves accordingly. The connecting frame 351 slides smoothly under the guidance of the guide seat 3514 through two parallel guide shafts 3513, and finally transmits the power to the push rod 352 at the end. The actuator of the push rod 352 then accurately pushes the wire wound on the mandrel 2 forward a predetermined distance, thereby forming a precise spring pitch. The pitch is entirely determined by the rotation angle and speed of the servo motor. Changing the pitch parameters can be accomplished simply by modifying the electronic control program in the software, avoiding the cumbersome process of stopping the machine to replace the traditional mechanical cam. At the same time, the high stability of the closed-loop control of the servo motor completely avoids the inaccuracy caused by pressure fluctuations in pneumatic drives, and is particularly good at achieving stable control of small pitches.

[0021] Simultaneously with the completion of the pitch-pushing action, the core-pushing mechanism 4 unfolds its precise linkage on the other side. Its power core is the camshaft 432 driven by the second servo motor 431. The rotation of the cam is converted into the swing of the upper swing arm 433: the periphery of the cam pushes one end of the upper swing arm 433, forcing the upper swing arm 433 to rotate around the hinge axis in its middle, and the pressure block 4332 at the other end presses down. This pressure is effectively transmitted through the first roller 4111 at the top of the action block 411, and is converted into the swing of the upper swing seat 41 around its rotation axis 44, driving the upper push rod 45 to perform the action of supporting or releasing the wire. The downward pressure of the action block 411 of the upper swing seat 41 acts on the second roller 4342 at the end of the lower swing arm 434, forcing the lower swing arm 434 to swing in the opposite direction, and precisely pulls the lower swing seat 42 through the hinge joint 4343 in its middle, so that the lower push rod 45 and the upper push rod 45 complete a synchronous mirror motion. The entire transmission chain is rigidly driven by a single cam, acting like a unified mechanical brain to ensure that the upper and lower push rods 45 move in a highly consistent and seamless manner when supporting the wire. This eliminates the asynchronous errors that are difficult to avoid with dual independent drive sources, providing unparalleled stability for spring forming, especially at high speeds.

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

Claims

1. A spring mechanism with a pusher core and pusher pitch combination device, characterized in that: The device includes a mandrel holder, a mandrel mounted on the mandrel holder, a pitch-pushing mechanism on one side of the mandrel holder, and a core-pushing mechanism on the other side of the mandrel holder. The pitch-pushing mechanism includes a mounting base, a first servo motor, a lead screw, a threaded sleeve, and an actuator. The lead screw is rotatably connected to the mounting base, and its length direction is parallel to the axial direction of the mandrel. The threaded sleeve is threaded onto the lead screw. The actuator is fixedly connected to the threaded sleeve, and its actuating end is located on one side of the mandrel. The first servo motor is fixed to the mounting base and connected to the lead screw to drive the lead screw to rotate in both directions, causing the actuating end of the actuator to reciprocate along the axial direction of the mandrel. The core-pushing mechanism includes an upper swing seat, a lower swing seat, and a cam drive assembly. The upper and lower swing seats are arranged symmetrically, and each of the two swing seats has a rotating shaft connected to its far end. The rotating shaft is parallel to the core rod, and the upper and lower swing seats can swing around the rotating shaft. Each of the two swing seats has a push rod at its near end, and the end faces of the two push rods are arranged around the axis of the core rod. Both the upper and lower swing seats are connected to the cam drive assembly, which drives the upper and lower swing seats to swing synchronously, causing the two push rods to move away from or return to the core rod.

2. The spring machine pusher and push pitch combination device according to claim 1, characterized in that: The actuator includes a connecting frame and a push rod disposed at the end of the connecting frame. The end of the push rod is the actuating end and is close to the side wall of the mandrel. The connecting frame is connected and fixed to the threaded sleeve.

3. The spring-operated pusher and pusher pitch combination device of a spring machine according to claim 2, characterized in that: The connecting frame includes a connecting shaft, a connecting block, a guide shaft, and a guide seat. There are two connecting shafts, one end of each of the two connecting shafts is connected and fixed to the threaded sleeve and is parallel to the lead screw. The two connecting shafts are distributed on opposite sides of the lead screw. The two connecting shafts are connected to the connecting block. The side of the connecting block away from the connecting shaft is connected and fixed to one end of the guide shaft. The guide shaft is parallel to the lead screw. The guide seat is provided with a guide hole that matches the guide shaft. The guide shaft slides through the guide hole. The push rod is fixed to the end of the guide shaft away from the connecting block.

4. The spring-operated pusher and pusher pitch combination device for a spring machine according to claim 3, characterized in that: There are two guide shafts, two guide holes are provided on the guide seat, and the number of push rods corresponds to the number of guide shafts. Each guide shaft is fixed with a push rod by bolts.

5. The spring machine pusher and push pitch combination device according to claim 1, characterized in that: Both the upper swing seat and the lower swing seat have arc-shaped slots at their ends away from the upper pivot. The arc-shaped slots extend with the pivot as the center. Bolts are inserted into both arc-shaped slots, and the upper swing seat and the lower swing seat are supported by the bolts.

6. The spring-making machine pusher and push pitch combination device according to claim 5, characterized in that: The cam drive mechanism includes a second servo motor, a camshaft, an upper swing arm, and a lower swing arm. A first hinge shaft is hinged to the middle of the upper swing arm, allowing the upper swing arm to swing around the first hinge shaft. A second hinge shaft is hinged to one end of the lower swing arm, allowing the lower swing arm to swing around the second hinge shaft. An actuating block is provided in the middle of the upper swing arm. One end of the upper swing arm abuts against the top of the actuating block, and the end of the lower swing arm away from the second hinge shaft abuts against the bottom of the actuating block. A hinge joint is provided in the middle of the lower swing arm, and the hinge joint connects to the... The lower swing seat is hinged at one end away from the pivot. The camshaft is parallel to the axial direction of the mandrel, and a cam is provided on the camshaft. The upper swing arm abuts against the peripheral wall of the cam at one end away from the actuating block. The second servo motor is connected to the camshaft to drive the camshaft to rotate. The camshaft drives the cam to rotate, causing the upper swing arm to swing and act on the actuating block, thereby causing the upper swing seat to swing. The swing of the upper swing seat causes the actuating block to act on the lower swing arm, causing the lower swing arm to swing and drive the lower swing seat to swing.

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