Single drive compression spring machining apparatus

Abstract

The application relates to the technical field of spring processing equipment, in particular to a single-drive compression spring processing device which comprises a rack, a wire feeding mechanism, a forming mechanism, a cutting mechanism and a driving assembly; the forming mechanism comprises a forming die, a bending assembly provided with a forming wheel and a jacking assembly provided with a jacking pin; the driving assembly comprises a driving motor and a time sequence shaft driven by the driving motor; the time sequence shaft is coaxially provided with a driving gear disc with a circumferential meshing tooth portion and a non-meshing portion, a driving cam with a convex portion and a driving block with a transition inclined surface; the three are circumferentially staggered along the time sequence shaft and have a preset phase relationship. The single power source is used to realize the mechanical time sequence linkage of wire feeding, pitch jacking and cutting; the time sequence is rigidly determined by the mechanical phase; the compression spring with two flat sections at the two ends and a spiral section in the middle can be continuously formed at one time; the device has low cost, good consistency and adjustable specifications.

Description

Technical Field

[0001] This application relates to the field of spring processing equipment technology, and in particular to a single-drive compression spring processing device. Background Technology

[0002] like Figure 14 The compression spring shown has straight sections at both ends and a helical structure in the middle. The straight sections refer to closed or nearly closed loops located in the same plane. These straight sections can form surface contact with adjacent parts, providing a flat and stable support surface for the compression spring and facilitating assembly and positioning. The helical structure in the middle provides compressive elasticity. This type of compression spring is commonly used in various fields such as outdoor camping equipment, household appliances, and automotive parts.

[0003] The difficulty in manufacturing this type of compression spring lies in the fact that it requires forming three interconnected segments—in-plane bending, spiral lift, and in-plane bending—from a single continuous wire in one operation. This necessitates that the wire feeding action, the pitch lifting action, and the cutting action be strictly connected in sequence. Specifically, the lifting action must begin during the wire feeding process and end before the wire feeding ends to ensure that a straight section is left at each end of the spring. The cutting action must be performed after the wire feeding stops to ensure that the wire is cut while stationary.

[0004] Existing CNC spring cutting machines typically use multiple servo motors to independently drive the wire feeding wheel, pitch mechanism, and cutting tool, relying on an electrical control system to achieve synchronization between the axes. This approach has the following problems: First, it involves a large number of power sources, resulting in high costs for motors, drivers, and encoders, and a large and complex overall machine size. Second, the timing of the three actions depends entirely on electrical synchronization; any lag or missed step on any axis will cause abrupt pitch changes, inconsistent lengths of the straight sections at both ends, and drift in the cutting position, leading to poor product consistency. Third, the debugging, calibration, and maintenance of the equipment require highly skilled operators, making it uneconomical for compression springs with a single specification and large production volume.

[0005] Existing technologies also include mechanical spring machines that use cam mechanisms, but usually only the cam is used to drive either the cutting tool or the pitch mechanism. The wire feeding action is still driven by an independent motor, so more than two power sources are still required. Furthermore, the phase relationship between each action is fixed after assembly, making it difficult to adjust the number of spring coils, pitch, and outer diameter. A single piece of equipment can often only process springs of one specification, resulting in poor flexibility.

[0006] Based on this, those skilled in the art have proposed a single-drive compression spring processing device, which provides a new solution to the above-mentioned technical problems. Summary of the Invention

[0007] To address the problems mentioned in the background art, this application provides a single-drive compression spring processing device and a compression spring processing method. The device uses a single drive motor and a single timing shaft to achieve the mechanical timing linkage of three actions: wire feeding, pitch lifting, and cutting, thereby continuously forming a compression spring with straight sections at both ends and a spiral section in the middle in one operation.

[0008] The single-drive compression spring processing device provided in this application adopts the following technical solution: A single-drive compression spring processing device includes: frame; A wire feeding mechanism, mounted on the frame, is used to intermittently feed the wire; A forming mechanism includes a forming mold, a plurality of forming wheels arranged circumferentially around the forming mold, and an ejector pin that can be raised and lowered axially along the forming mold. A forming channel is formed between the forming wheels and the forming mold to bend the wire into a loop. The ejector pin is used to lift the wire axially along the forming mold while bending it. The cutting mechanism includes a cutting tool for cutting off the tail of the spring; The drive assembly includes a drive motor and a timing shaft driven by the drive motor to rotate. A drive gear, a drive cam, and a drive block are coaxially mounted on the timing shaft. The drive gear has meshing and non-meshing teeth in sequence along its circumference and is connected to the wire feeding mechanism via a gear transmission chain. The input gear of the gear transmission chain meshes with the meshing teeth and disengages from the non-meshing teeth. The drive cam has a protrusion and is connected to the ejector pin via a first transmission mechanism. The drive block is connected to the cutting tool via a second transmission mechanism. The meshing teeth, the protrusion, and the drive block are staggered circumferentially along the timing axis. Each rotation of the timing axis constitutes a processing cycle. Within the same processing cycle, the time period during which the protrusion drives the ejector pin is within the time period during which the meshing teeth drive the wire feeding mechanism to feed the wire, and the time period during which the drive block drives the cutting tool is within the wire feeding stop time period corresponding to the non-meshing part.

[0009] By adopting the above technical solution, the power for the three actions of wire feeding, pitch lifting, and cutting all comes from the same drive motor. Furthermore, the actuators for these three actions—the drive gear, drive cam, and drive block—are coaxially arranged on the same timing axis. Therefore, the timing sequence of the three actions is rigidly determined by their mechanical phase in the circumferential direction of the timing axis, independent of motor speed, load fluctuations, and the response characteristics of the electrical control system. Compared to a solution where multiple motors drive the system separately and rely on electrical synchronization, the timing sequence of this solution will not be disrupted by a lag in the response of any one axis. The consistency of the straight section lengths at both ends of the finished product, the pitch distribution, and the cutting position is significantly improved. Simultaneously, only one drive motor is needed to complete all three processes, eliminating the need for two separate sets of motors. The machine features a motor, driver, and synchronous control unit, resulting in low overall cost and a compact structure. More importantly, by limiting the action period of the protrusion to the engagement period of the meshing teeth—that is, lifting begins after wire feeding starts and ends before wire feeding ends—the same wire undergoes in-plane bending, bending while lifting, and in-plane bending processes sequentially at the same station. This allows for the continuous forming of a compression spring with straight ends and a spiral middle section in one operation, eliminating the need for secondary clamping or multi-station transfer. By limiting the action period of the drive block to the wire feeding stop period corresponding to the non-engaging part, the cutting action is performed when the wire is stationary, avoiding wire damage and uneven cuts caused by cutting while feeding.

[0010] Optionally, along the rotation direction of the timing axis, the starting end of the protrusion lags behind the starting end of the meshing teeth by a first phase angle, and the ending end of the protrusion leads the ending end of the meshing teeth by a second phase angle. The wire lengths corresponding to the first phase angle and the second phase angle respectively form the straight sections at both ends of the compression spring. The outer contour of the protrusion is a transition surface whose radial protrusion gradually increases from zero to a apex along the rotation direction of the timing axis, and then gradually decreases from the apex to zero. By adopting the above technical solution, the lengths of the straight sections at both ends of the compression spring are converted into two phase angles that can be precisely given during the design and assembly stages, namely the first phase angle and the second phase angle. The corresponding wire feed length is the unfolded length of the straight section. In this way, the lengths of the straight sections at both ends no longer depend on the timing parameters of the control program, but are guaranteed by the mechanical structure itself, resulting in high repeatability. Furthermore, by setting the values ​​of the first and second phase angles respectively, compression springs with equal or unequal lengths of the straight sections at both ends can be easily manufactured to meet different assembly requirements. Since the pitch depends on the lifting speed of the ejector pin... The pitch is determined by the ratio of the feed rate to the wire speed, which remains relatively constant during the meshing of the teeth. The lifting speed of the ejector pin determines the pitch size. The protrusion adopts the aforementioned transitional curved surface profile that gradually increases and then decreases, so that the pitch is minimum at both ends of the helical section and maximum in the middle, thus forming a smooth transition between the straight section and the helical section. This avoids the formation of bends and stress concentration points at the transition point due to abrupt pitch changes, thereby improving the fatigue life of the compression spring. At the same time, the pitch gradually increases from zero when transitioning from the straight section to the helical section, which also makes the force exerted by the ejector pin on the wire increase gradually, reducing the risk of the wire being scratched by the ejector pin or coming out of the forming channel.

[0011] Optionally, the drive block is radially disposed on the side of the drive gear disk opposite to the drive cam, one end of the drive block is fixed on the timing shaft, the drive gear disk has an arc-shaped mounting groove concentric with the timing shaft, and the other end of the drive block is adjustablely fixed in the mounting groove along the position of the mounting groove; the end of the drive block is provided with a transition slope for adapting and abutting with the second transmission mechanism, and the transition slope is disposed on the side of the drive block facing the non-meshing part; By adopting the above technical solution, firstly, one end of the drive block is fixed to the timing shaft, and the other end is fixed in an arc-shaped mounting groove concentric with the timing shaft. Therefore, the drive block can reliably rotate synchronously with the timing shaft, and its phase relative to the meshing teeth can be adjusted by changing its fixed position in the mounting groove, that is, adjusting the timing of the cutting action, thereby adapting to different spring lengths and cutting allowances. Secondly, the transition slope is set on the side of the drive block facing the non-meshing part, that is, the side facing the wire feeding stop period, so that the drive block gradually wedges into and pushes the second transmission mechanism with the slope after entering the wire feeding stop period. The cutting action has a smooth push stroke, small impact, and can reliably ensure that the cutting occurs after the wire feeding stops.

[0012] Optionally, two drive gear disks are stacked along the axial direction of the timing axis. Both drive gear disks are positioned opposite to the input gear of the gear transmission chain. The meshing teeth of the two drive gear disks are aligned or staggered with each other circumferentially to change the effective arc length of the meshing teeth meshing with the input gear. By adopting the above technical solution, when the meshing teeth of the two drive gears are aligned with each other circumferentially, the input gear is driven within the arc segment covered by the two meshing teeth, resulting in the shortest effective meshing arc length. When the two meshing teeth are staggered circumferentially, the input gear is driven as long as either meshing tooth engages with the input gear. Therefore, the effective meshing arc length increases with the increase of the staggered angle. Since the effective meshing arc length directly determines the wire feed length within a processing cycle, and thus determines the number of coils and the total length of the compression spring, compression springs with different numbers of coils can be processed on the same machine simply by adjusting the relative angle between the two drive gears, without replacing the gears or modifying the transmission chain, greatly improving the flexibility of the equipment.

[0013] Optionally, the drive motor is fixedly mounted on the frame, and the output end of the drive motor is connected to a transmission shaft. An eleventh gear is fixed to the outside of the transmission shaft. A sixth rotating shaft is rotatably mounted on the frame and located on one side of the eleventh gear. A twelfth gear and a thirteenth gear are sequentially fixed to the outside of the sixth rotating shaft along the axial direction. The eleventh gear and the thirteenth gear are meshed together. A timing shaft is rotatably mounted on the frame and located on one side of the transmission shaft. A fourteenth gear and the drive gear are sequentially fixed to the outside of the timing shaft along the axial direction. The top of the timing shaft extends out of the frame and is fixed to the drive cam. The fourteenth gear and the twelfth gear are meshed together. The gear transmission chain includes an eighth rotating shaft rotatably mounted on the frame and located on one side of the timing shaft, and a sixteenth gear and a fifteenth gear sequentially fixed to the outside of the eighth rotating shaft along the axial direction. The fifteenth gear is the input gear of the gear transmission chain and is used to mesh with the meshing gear. The sixteenth gear is connected to the wire feeding mechanism. By adopting the above technical solution, the power of the drive motor is transmitted to the timing shaft after two stages of reduction via the transmission shaft, the eleventh gear, the thirteenth gear, the sixth rotating shaft, the twelfth gear, and the fourteenth gear. This reduces the high speed of the motor to a timing shaft speed suitable for spring forming, and obtains a large torque through gear transmission to overcome the force required for wire bending, lifting, and cutting. At the same time, the drive gear plate is coaxially fixed with the fourteenth gear, and the drive cam is fixed to the top of the timing shaft extending from the frame, so that the three timing components are arranged in layers in the axial direction without interfering with each other, which facilitates assembly and maintenance. The fifteenth gear and the sixteenth gear are coaxially set on the eighth rotating shaft, forming an intermediate link in the intermittent transmission from the drive gear plate to the wire feeding mechanism, so that the reversing and deceleration of the intermittent transmission are concentrated on a single rotating shaft, resulting in a short transmission chain and small transmission error.

[0014] Optionally, the wire feeding mechanism includes a wire inlet head fixed to the top of the frame, a wire guide strip fixedly installed on the top of the frame and facing the wire inlet head, and a first rotating shaft, a second rotating shaft, a third rotating shaft, and a fourth rotating shaft rotatably mounted on the frame. The wire outlet end of the wire guide strip faces the forming mold. The tops of the first rotating shaft, the second rotating shaft, the third rotating shaft, and the fourth rotating shaft extend out of the frame and are respectively fixed with a first wire feeding reel, a second wire feeding reel, a third wire feeding reel, and a fourth wire feeding reel. The third rotating shaft is connected to the first... A rotating shaft is sequentially arranged on one side of the conductor bar along the wire feeding direction, and a second rotating shaft and a fourth rotating shaft are sequentially arranged on the other side of the conductor bar along the wire feeding direction. The second rotating shaft is directly opposite the first rotating shaft, and the fourth rotating shaft is directly opposite the third rotating shaft, so that the first wire feeding reel and the second wire feeding reel, and the third wire feeding reel and the fourth wire feeding reel respectively constitute two pairs of wire feeding reels for clamping the wire. The wire inlet, the conductor bar, and the clamping positions of the two pairs of wire feeding reels together define the wire feeding channel of the wire. A first gear and a second gear are fixed sequentially along the axial direction on the outer side of the first rotating shaft; a third gear is fixed on the outer side of the second rotating shaft; a fourth gear, a fifth gear, and a sixth gear are fixed sequentially along the axial direction on the outer side of the third rotating shaft; and a seventh gear is fixed on the outer side of the fourth rotating shaft. A fifth rotating shaft is rotatably mounted on the frame; a tenth gear, a ninth gear, and an eighth gear are fixed sequentially along the axial direction on the outer side of the fifth rotating shaft. The first gear is located between the third gear and the tenth gear and meshes with both of them; the fourth gear is located between the seventh gear and the tenth gear and meshes with both of them; the fifth gear meshes with the ninth gear; the eighth gear meshes with the second gear; and the sixth gear meshes with the sixteenth gear. By adopting the above technical solution, the four wire feeding reels are arranged in pairs to form two pairs of clamping wheels. The wire is clamped by the two pairs of wire feeding reels and moves forward under the four-point friction drive. Compared with a single pair of wire feeding reels, the clamping length is longer, the slippage is smaller, and the wire feeding length is more accurate. Moreover, the wire has been straightened by the two pairs of wire feeding reels before entering the forming channel. At the same time, the eighth, ninth, and tenth gears on the fifth rotating shaft serve as a common intermediate gear set, distributing the power on the third rotating shaft to the first, second, and fourth rotating shafts simultaneously. This also causes the two wire feeding reels in each pair to rotate in opposite directions and rotate at the same speed. The four wire feeding reels are rigidly linked by the same gear chain, eliminating the speed difference between the wire feeding reels. This fundamentally eliminates wire scratches and wire feeding length errors caused by inconsistent speeds when multiple motors drive the wire feeding wheels.

[0015] Optionally, the forming mechanism includes a bending assembly, which includes a mounting block fixed to the top of the frame and a first mounting plate fixed to the top of the frame and located on the side of the forming mold opposite to the wire feeding mechanism. The forming mold is detachably disposed inside the mounting block. A pressure block is slidably disposed on the frame and located on one side of the mounting block. A second adjusting screw is threadedly connected to the frame. The pressure block is rotatably connected to the end of the second adjusting screw and is used to press the forming mold under the drive of the second adjusting screw to position it. A plurality of support rods are slidably disposed on the inner side of the first mounting plate along the circumference of the forming mold. The forming wheel is rotatably disposed on the support rods toward the end of the forming mold. A first adjusting screw is threadedly connected to the end of the support rod opposite to the corresponding forming wheel on the first mounting plate. The support rod is rotatably connected to the end of the corresponding first adjusting screw to adjust the radial distance between the corresponding forming wheel and the forming mold by rotating the first adjusting screw. By adopting the above technical solution, several forming wheels are arranged sequentially along the circumference of the forming mold. After the wire is fed in, it contacts each forming wheel in turn and changes direction multiple times, thus being gradually bent into a ring between the forming wheels and the forming mold. Compared with single-point bending, multi-wheel progressive bending makes the plastic deformation of the wire more uniform, the springback smaller, and the roundness better. At the same time, each support rod is driven by an independent first adjusting screw through a thread to slide radially. Therefore, the radial distance between each forming wheel and the forming mold can be adjusted independently and precisely. The bending radius of the wire can be changed by adjusting the distance as a whole, thereby changing the outer diameter of the compression spring. Alternatively, the diameter tolerance of the wire and the difference in material springback can be compensated by fine-tuning individual forming wheels, so that compression springs with different outer diameters can be processed on the same machine.

[0016] Optionally, the molding mechanism includes a lifting assembly, which includes a lifting rod that is vertically slidably mounted on the frame. The ejector pin is fixed to the top of the lifting rod and to the side near the molding die. A top block is fixed to the middle of the outer side of the lifting rod. A first spring is sleeved on the outer side of the lifting rod and above the top block. The two ends of the first spring abut against the frame and the top block, respectively. The first transmission mechanism includes a first transmission plate rotatably disposed on the top of the frame and located on the side of the drive cam away from the forming mold. A first transmission wheel for adapting and abutting against the protrusion is rotatably connected to one end of the first transmission plate near the drive cam. A push rod is fixed to one end of the first transmission plate away from the first transmission wheel. An L-shaped transmission angle plate is rotatably disposed on the frame and located on the side of the push rod. A second transmission wheel is rotatably disposed on one end of the transmission angle plate away from the push rod. A lifting drive plate is rotatably disposed on the frame and located between the top block and the second transmission wheel. One end of the lifting drive plate is located below and abuts against the second transmission wheel, and the other end of the lifting drive plate is located below and abuts against the top block. By adopting the above technical solution, the radial motion of the drive cam is transmitted sequentially through the first transmission wheel, the first transmission plate, the push rod, the L-shaped transmission angle plate, the second transmission wheel, and the lifting drive plate, and is finally converted into the vertical motion of the top block and the lifting rod. This transmission chain consists of three-stage swinging components connected in series. On the one hand, the L-shaped transmission angle plate realizes the conversion of the motion direction from horizontal to vertical, allowing the drive cam to be arranged on the top of the frame and the lifting rod to be arranged on the inside of the frame, resulting in a compact structure. On the other hand, the selection of the lever arm ratio of each swinging component realizes the stroke amplification, that is, the smaller radial protrusion of the drive cam can obtain the larger lifting stroke required by the ejector pin, thereby reducing the diameter and inertia of the drive cam. In addition, the first transmission wheel and the second transmission wheel are in rolling contact, and the contact point is a rolling friction, resulting in low wear and smooth operation. The first spring drives the lifting rod to automatically reset and the swinging components to return to their positions after the protrusion disengages from the first transmission wheel, without the need for an additional reset power source.

[0017] Optionally, the forming mold has a cutting surface on the side opposite to the forming wheel, and the cutting tool is slidably mounted on the frame and located on the side of the cutting surface opposite to the forming wheel; The second transmission mechanism includes a first transmission rod, a push rod, a second transmission rod, and a connecting rod. The first transmission rod is rotatably mounted on the frame, and a third transmission wheel for adapting and abutting against the drive block is rotatably connected to the end of the first transmission rod near the drive gear. The push rod is slidably mounted on the frame, and one end of the push rod abuts against one side of the first transmission rod. A support column is fixed to one side of the frame, and the support column is located between the push rod and the connecting rod. The middle part of the second transmission rod is rotatably connected to the end of the support column, and one end of the second transmission rod is rotatably connected to the other end of the push rod. The other end of the second transmission rod is rotatably connected to the cutting tool through the connecting rod. The push rod is located below the connecting rod. A second spring is connected between the end of the second transmission rod near the push rod and the frame. In its natural state, the push rod abuts against one side of the first transmission rod under the action of the second spring. By adopting the above technical solution, the cutting surface is directly set on the forming mold. The cutting tool and the cutting surface move in close contact to form a shearing pair. When cutting, the wire is clamped between the blade and the cutting surface and sheared. The cut is flat and has small burrs, and there is no need to set up a separate support anvil. The rotation of the drive block is transmitted to the cutting tool through the third transmission wheel, the first transmission rod, the push rod, the second transmission rod with the support column as the fulcrum, and the connecting rod. The second transmission rod with the support column as the fulcrum forms a lever. The ratio of the lever arms at both ends can be selected according to the shearing force required for cutting to amplify the thrust. Therefore, a smaller cam thrust can complete the cutting. The second spring, on the one hand, ensures that the push rod always abuts against the first transmission rod in the natural state to eliminate the gap in the transmission chain and ensure that the stroke of each cutting is consistent. On the other hand, after the drive block disengages from the third transmission wheel, it drives the entire transmission chain and the cutting tool to automatically reset, so that the tool can be withdrawn from the forming area in time and does not hinder the wire feeding and bending of the next processing cycle.

[0018] Secondly, the compression spring processing method provided in this application adopts the following technical solution: A method for processing compression springs, using the aforementioned single-drive compression spring processing device, comprises five steps sequentially within one processing cycle consisting of one revolution of the timing axis: forming a straight section at the beginning, forming a spiral section, forming a straight section at the end, cutting, and resetting. In the forming step, the meshing teeth engage while the wire feeding mechanism feeds the wire; the protrusion has not yet contacted the first transmission mechanism, and the ejector pin remains at its initial height. In the forming step, the meshing teeth remain engaged while the wire feeding mechanism continues to feed the wire; the protrusion simultaneously drives the lifting assembly, causing the ejector pin to gradually rise. In the forming step, the protrusion disengages from the first transmission mechanism, the ejector pin resets, and the meshing teeth remain engaged while wire feeding continues. In the cutting step, the non-meshing part aligns with the input gear of the gear transmission chain, stopping wire feeding; the drive block drives the cutting tool to cut off the spring tail. In the resetting step, the drive block disengages from the second transmission mechanism, and the cutting tool resets.

[0019] By adopting the above technical solution, the sequence of the five steps and the start and end times of each step are uniquely determined by the phase relationship of the three timing components on the timing axis. The operator only needs to start the drive motor, and the device can complete the processing of the compression spring in a cyclic, continuous and automatic manner without the need to write and debug the synchronization program for each action. Furthermore, since the wire feeding is carried out continuously throughout the entire S to S stage, with only the lifting action intervening in the middle period, the wire is always in a clamped and constrained state during the forming process, avoiding the joint marks and positioning errors caused by segmented wire feeding.

[0020] In summary, this application includes at least one of the following beneficial technical effects: In this invention, the three actions of wire feeding, pitch lifting and cutting are driven by the same drive motor, and output by the drive gear, drive cam and drive block arranged coaxially on the same timing shaft. The timing sequence of the actions is determined by mechanical phase rigidity, without the need for electrical synchronization. The timing accuracy is high and the consistency is good. Moreover, the number of power sources is small, the cost is low and the structure is compact. The active period of the protrusion in this invention is within the meshing period of the meshing teeth, so that the same wire can be continuously formed into a compression spring with straight sections at both ends and a spiral section in the middle at the same station, without the need for secondary clamping and multi-station transfer. The driving block of the present invention operates within the wire feeding stop time corresponding to the non-engaging part, and the cutting is performed when the wire is stationary. The cutting tool is in contact with the cutting surface set on the forming mold to form a shearing pair, and the cut is flat and has small burrs. The protrusion of this invention adopts a transitional curved surface profile with a radial protrusion that gradually increases and then decreases, so that the pitch of the helical segment first increases and then decreases, and the transition between the straight segment and the helical segment is smooth, avoiding stress concentration caused by abrupt pitch changes; This invention allows for the adjustment of the wire feeding length, thereby adjusting the number of spring coils and the total length, by adjusting the offset angle of the meshing teeth between two stacked drive gear discs; the radial distance between the forming wheel and the forming mold can be adjusted by the first adjusting screw, thereby adjusting the outer diameter of the spring; the phase of the drive block can be adjusted by the arc-shaped mounting groove, thereby adjusting the cutting time; and the inner diameter of the spring can be adjusted by quickly changing the forming mold by the second adjusting screw, thus achieving multiple specifications in one machine. The lifting transmission chain of this invention consists of three-stage swing components connected in series: a first transmission plate, an L-shaped transmission angle plate, and a lifting drive plate. It has the functions of changing the direction of motion and amplifying the stroke. The small stroke of the cam can obtain the large lifting stroke of the ejector pin, and it is automatically reset by the first spring. The cutting transmission chain uses the support column as a fulcrum to form a lever to amplify the thrust, and the second spring eliminates the gap and automatically resets the chain. Neither of the two transmission chains requires an additional power source. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of the main structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the overall structure of the wire feeding mechanism, forming mechanism and cutting mechanism of the present invention.

[0024] Figure 4 This is a schematic diagram of the overall structure of the wire feeding mechanism, cutting mechanism, bending assembly, and lifting assembly of the present invention.

[0025] Figure 5 This is a top view of the structure of the present invention.

[0026] Figure 6 This is a schematic diagram of the wire feeding mechanism of the present invention.

[0027] Figure 7 This is a schematic diagram of the bending component of the present invention.

[0028] Figure 8 This is a schematic diagram of the lifting component of the present invention.

[0029] Figure 9 This is a schematic diagram of the structure of the driving component of the present invention.

[0030] Figure 10 This is a schematic diagram of the cutting mechanism of the present invention.

[0031] Figure 11 This is a schematic diagram of the structure of the third transmission wheel, drive gear disk and drive block of the present invention.

[0032] Figure 12 This is a schematic diagram of the transmission relationship between the gears in this invention.

[0033] Figure 13 This is a schematic diagram of the molding die and pressing block of the present invention.

[0034] Figure 14 This is a schematic diagram of the structure of the compression spring processed by the present invention. Explanation of reference numerals in the attached figures: 1. Wire feeding mechanism; 11. First rotating shaft; 111. First wire feeding reel; 112. First gear; 113. Second gear; 12. Second rotating shaft; 121. Second wire feeding reel; 122. Third gear; 13. Third rotating shaft; 131. Third wire feeding reel; 132. Fourth gear; 133. Fifth gear; 134. Sixth gear; 14. Fourth rotating shaft; 141. Fourth wire feeding reel; 142. Seventh gear; 15. Wire inlet; 16. Wire strip; 17. Fifth rotating shaft; 171. Eighth gear; 172. Ninth gear; 173. Tenth gear; 2. Forming mechanism; 21. Bending assembly; 211. First mounting plate; 212. Support rod; 213. Forming wheel; 214. First adjusting screw; 215. Forming mold; 216. Cutting surface; 217. Mounting block; 218. Pressure block; 219. Second adjusting screw; 22. Lifting assembly; 2201. Lifting rod; 2202. Ejector pin; 2203. Ejector block; 2204. First spring; 2205. First transmission plate; 2206. First transmission wheel; 2207. Transmission angle plate; 2208. Second transmission wheel; 2209. Lifting drive plate; 2210. Push rod; 3. Cutting mechanism; 301. First transmission rod; 302. Third transmission wheel; 303. Top rod; 304. Second transmission rod; 305. Support column; 306. Connecting rod; 307. Cutting tool; 308. Second spring; 4. Drive assembly; 401. Drive motor; 402. Transmission shaft; 403. Eleventh gear; 404. Sixth shaft; 405. Twelfth gear; 406. Thirteenth gear; 407. Timing shaft; 408. Fourteenth gear; 409. Drive cam; 4091. Protrusion; 410. Drive gear plate; 4101. Meshing teeth; 4102. Non-meshing teeth; 4103. Mounting groove; 411. Drive block; 4111. Transition slope; 412. Eighth shaft; 413. Fifteenth gear; 414. Sixteenth gear; 5. Frame. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the following will be described in conjunction with the appendix. Figure 1-10 The present invention will now be described in further detail.

[0036] like Figure 14 As shown, the compression spring processed in this embodiment includes straight sections at both ends of its axial direction and a helical section between the two straight sections. The two straight sections are each located in a plane that is substantially perpendicular to the spring axis, while the helical section extends along the spring axis.

[0037] Reference Figures 1 to 5 This application provides a single-drive compression spring processing device, which includes a frame 5, a wire feeding mechanism 1, a forming mechanism 2, a cutting mechanism 3, and a drive assembly 4.

[0038] The frame 5 includes a base plate at the bottom, columns fixed to the base plate, and a housing fixed to the top of the columns. The housing has a top plate and an installation space below the top plate. The actuators of the wire feeding mechanism 1 and the forming mechanism 2 are located above the top plate of the housing. Gears, shafts, and transmission components are located within the installation space of the housing and above the top plate. The lower surface of the base plate is provided with several adjustable feet to adjust the level of the entire machine (see reference). Figure 1 The drive assembly 4 is fixedly mounted on the frame 5 and is used to provide power and drive the wire feeding mechanism 1, the forming mechanism 2 and the cutting mechanism 3 to operate in sequence according to the timing.

[0039] The wire feeding mechanism 1 is mounted on the frame 5 and is used to intermittently feed wire, which serves as the raw material for the spring, to the forming mechanism 2 along the wire feeding channel. In this embodiment, the wire is spring steel wire. The forming mechanism 2 includes a forming mold 215, a bending assembly 21, and a lifting assembly 22. The bending assembly 21 is used to bend the wire fed by the wire feeding mechanism 1, and the lifting assembly 22 is used to lift the wire while bending it to form a spiral segment. The cutting mechanism 3 is used to cut off the tail end of the spring after processing.

[0040] Reference Figure 5 , Figure 6 and Figure 12 The wire feeding mechanism 1 includes a wire inlet head 15 fixed to the rear end of the top of the frame 5 and a wire guide strip 16 fixedly installed on the top of the frame 5 and facing the wire inlet head 15. The wire passes through the wire inlet head 15 and the wire guide strip 16 in sequence. The wire inlet head 15 is used to guide the wire from the wire feed reel and perform initial positioning. The wire guide strip 16 is located between the wire feed reel and the forming mold 215 and is used to constrain and guide the wire. The wire outlet end of the wire guide strip 16 is set towards the forming mold 215. After the wire extends out from the wire outlet end of the wire guide strip 16, it enters the forming mechanism 2.

[0041] A first rotating shaft 11, a second rotating shaft 12, a third rotating shaft 13, and a fourth rotating shaft 14 are rotatably mounted on the frame 5. The third rotating shaft 13 and the first rotating shaft 11 are arranged sequentially on the right side of the conductor strip 16 in the front-back direction, while the second rotating shaft 12 and the fourth rotating shaft 14 are arranged sequentially on the left side of the conductor strip 16 in the front-back direction. The second rotating shaft 12 and the first rotating shaft 11 are arranged facing each other left and right, and the fourth rotating shaft 14 and the third rotating shaft 13 are arranged facing each other left and right. The tops of the first rotating shaft 11, the second rotating shaft 12, the third rotating shaft 13, and the fourth rotating shaft 14 extend out of the frame 5 and are fixed with a first wire feeding reel 111, a second wire feeding reel 121, a third wire feeding reel 131, and a fourth wire feeding reel 141, respectively. Thus, the first wire feeding reel 111 and the second wire feeding reel 121 form the first pair of wire feeding reels, and the third wire feeding reel 131 and the fourth wire feeding reel 141 form the second pair of wire feeding reels. The two pairs of wire feeding reels are arranged sequentially along the wire feeding direction and clamp the wire from the left and right sides respectively. Each wire feed reel has an annular feeding groove on its outer circumference that matches the wire diameter to increase friction with the wire and prevent lateral deviation of the wire. The wire inlet 15, the conductor strip 16, and the clamping positions of the two pairs of wire feed reels together define the wire feeding channel.

[0042] Reference Figure 6 and Figure 12A first gear 112 and a second gear 113 are fixed sequentially on the outer side of the first rotating shaft 11. A third gear 122 is fixed on the outer side of the second rotating shaft 12. A fourth gear 132, a fifth gear 133, and a sixth gear 134 are fixed sequentially on the outer side of the third rotating shaft 13. A seventh gear 142 is fixed on the outer side of the fourth rotating shaft 14. A fifth rotating shaft 17 is rotatably mounted on the frame 5. A tenth gear 173, a ninth gear 172, and an eighth gear 171 are fixed sequentially on the outer side of the fifth rotating shaft 17. The first gear 112 is located between the third gear 122 and the tenth gear 173 and is meshed with both of them respectively; the fourth gear 132 is located between the seventh gear 142 and the tenth gear 173 and is meshed with both of them respectively; the fifth gear 133 is meshed with the ninth gear 172; the eighth gear 171 is meshed with the second gear 113; and the sixth gear 134 is meshed with the sixteenth gear 414 in the drive assembly 4, thereby forming a wire feeding gear set from the sixteenth gear 414 to the four wire feeding reels.

[0043] The aforementioned wire feeding gear set enables the four wire feeding discs to be rigidly linked: the sixth gear 134, after receiving power from the self-drive assembly 4, drives the third rotating shaft 13 and its fourth gear 132 and fifth gear 133 to rotate synchronously; the fourth gear 132 drives the seventh gear 142 to rotate in the opposite direction, thereby causing the fourth wire feeding disc 141 and the third wire feeding disc 131 to rotate synchronously in the opposite direction; at the same time, the fourth gear 132 and the fifth gear 133 drive the tenth gear 173 and the ninth gear 172 to rotate respectively, the tenth gear 173 drives the first gear 112 to rotate, and the first gear 112 drives the third gear 122 to rotate in the opposite direction, thereby causing the first wire feeding disc 111 and the second wire feeding disc 121 to rotate synchronously in the opposite direction; the meshing of the eighth gear 171 and the second gear 113 forms a second meshing branch between the fifth rotating shaft 17 and the first rotating shaft 11, which is used to eliminate transmission backlash and make the direction of rotation and speed of the two pairs of wire feeding discs strictly consistent. By reasonably selecting the number of teeth of each of the above gears, the rotation direction of the first gear 112 and the fourth gear 132 can be made to be the same, that is, the two pairs of wire feeding discs apply the same feeding friction force to the wire.

[0044] Reference Figure 7 and Figure 13 The bending assembly 21 includes a mounting block 217 fixed to the top of the frame 5 and located at the end of the wire 16. A forming mold 215 is provided on the inner side of the mounting block 217. The forming mold 215 is a detachable cylindrical mold, whose outer circumferential surface is used to fit against the inner side of the wire, and its outer diameter determines the inner diameter of the compression spring. A pressure block 218 is slidably disposed on the inner side of the frame 5 and on one side of the mounting block 217. A second adjusting screw 219 is threadedly connected to the inner side of the frame 5. The pressure block 218 is rotatably connected to the end of the second adjusting screw 219. When the second adjusting screw 219 is rotated, the pressure block 218 moves forward or backward along its sliding direction, thereby pressing or releasing the forming mold 215 for positioning and replacement.

[0045] The bending assembly 21 also includes a first mounting plate 211 fixed to the top of the frame 5 and located on the side of the forming mold 215 away from the wire 16. A plurality of support rods 212 are slidably arranged on the inner side of the first mounting plate 211 along the circumference of the forming mold 215. In this embodiment, three support rods 212 are arranged at intervals along the circumference of the forming mold 215. Each support rod 212 has a forming wheel 213 rotatably mounted on its end facing the forming mold 215. A forming channel for bending the wire into a loop is formed between the forming wheel 213 and the outer circumferential surface of the forming mold 215. A first adjusting screw 214 is threadedly connected to the inner side of the first mounting plate 211 and to the end of the support rod 212 away from the corresponding forming wheel 213. The support rod 212 is rotatably connected to the end of the corresponding first adjusting screw 214. Rotating any of the first adjusting screws 214 drives the corresponding support rod 212 to slide radially, thereby independently adjusting the radial distance between the forming wheel 213 and the forming mold 215. The radial distance between the three forming wheels 213 and the forming mold 215 together determines the bending radius of the wire, which in turn determines the outer diameter of the compression spring.

[0046] Reference Figure 4 , Figure 8 and Figure 9 The lifting assembly 22 includes a lifting rod 2201 that is vertically slidably disposed inside the frame 5. A ejector pin 2202 is fixed to the top of the lifting rod 2201 near the forming mold 215. The ejector pin 2202 is located below the forming channel and faces the outer periphery of the forming mold 215, and is used to lift the wire upwards along the axial direction (i.e., vertical direction) of the forming mold 215 while the wire is bent. A top block 2203 is fixed to the middle of the outer side of the lifting rod 2201. A first spring 2204 is sleeved on the outer side of the lifting rod 2201 and on top of the top block 2203. The two ends of the first spring 2204 abut against the frame 5 and the top block 2203 respectively, thereby applying a downward restoring force to the lifting rod 2201.

[0047] The first transmission mechanism between the drive cam 409 and the lifting assembly 22 is as follows: A first transmission plate 2205 is rotatably mounted on the top of the frame 5, on the side of the drive cam 409 away from the forming mold 215. A first transmission wheel 2206 is rotatably connected to one end of the first transmission plate 2205 near the protrusion 4091. A push rod 2210 is fixed to the inner side of the end of the first transmission plate 2205 away from the first transmission wheel 2206. A transmission angle plate 2207 is rotatably mounted on the frame 5, on the side of the push rod 2210. 7 is L-shaped, with its corner rotatably supported on the frame 5. A second transmission wheel 2208 is rotatably mounted on the end of the transmission angle plate 2207 away from the push rod 2210. The second transmission wheel 2208 is located on one side of the top block 2203. A lifting drive plate 2209 is rotatably mounted on the frame 5 between the top block 2203 and the second transmission wheel 2208. One end of the lifting drive plate 2209 is located below and abuts against the second transmission wheel 2208, and the other end of the lifting drive plate 2209 is located below and abuts against the top block 2203.

[0048] When the protrusion 4091 of the drive cam 409 pushes the first transmission wheel 2206, the first transmission plate 2205 rotates around its fulcrum and moves the push rod 2210 toward the end of the transmission angle plate 2207, pushing one end of the transmission angle plate 2207 toward the lifting drive plate 2209, thereby causing the second transmission wheel 2208 to swing downward, pressing one end of the lifting drive plate 2209 downward, causing the other end of the lifting drive plate 2209 near the top block 2203 to tilt upward, thereby gradually lifting the top block 2203 upward. The lifting rod 2201 and the ejector pin 2202 rise accordingly and compress the first spring 2204. The aforementioned first transmission plate 2205, transmission angle plate 2207 and lifting drive plate 2209 constitute a three-stage series swinging component, wherein the transmission angle plate 2207 realizes the conversion of the direction of motion from horizontal to vertical, and the lever arm ratio of each swinging component realizes the amplification of the stroke. After the protrusion 4091 disengages from the first transmission wheel 2206, the first spring 2204 pushes the top block 2203 and the lifting rod 2201 to return to their original position. The first transmission plate 2205 is then returned to its original position via the lifting drive plate 2209, the second transmission wheel 2208, the transmission angle plate 2207, and the push rod 2210, ready for the next processing cycle.

[0049] Reference Figures 9 to 13 The forming mold 215 has a cutting surface 216 on the side away from the forming wheel 213, and a cutting tool 307 is slidably disposed on the frame 5 on the side of the cutting surface 216 away from the forming wheel 213. The cutting edge of the cutting tool 307 slides in contact with the cutting surface 216 to form a shearing pair, thereby cutting the wire located therein.

[0050] The second transmission mechanism between the drive block 411 and the cutting mechanism 3 is as follows: A first transmission rod 301 is rotatably mounted on the frame 5 at the end of the push rod 303 away from the second transmission rod 304. A third transmission wheel 302 is rotatably connected to the end of the first transmission rod 301 near the drive gear plate 410. The push rod 303 is slidably mounted on the frame 5. A support column 305 is fixed on one side of the frame 5. The support column 305 is located between the push rod 303 and the connecting rod 306. The middle part of the second transmission rod 304 is rotatably connected to the end of the support column 305. The end of the second transmission rod 304 away from the connecting rod 306 is rotatably connected to the push rod 303. The end of the second transmission rod 304 away from the push rod 303 is rotatably connected to the connecting rod 306. The end of the connecting rod 306 away from the second transmission rod 304 is rotatably connected to the end of the cutting tool 307 away from the forming mold 215. The push rod 303 is located below the connecting rod 306. The second transmission rod 304 has two sides connected to the second spring 308 near the top rod 303, and the other end of the second spring 308 is connected to the frame 5. In its natural state, the top rod 303 abuts against one side of the first transmission rod 301 under the action of the second spring 308.

[0051] When the transition slope 4111 at the end of the drive block 411 gradually contacts and pushes the third transmission wheel 302, the first transmission rod 301 rotates around its fulcrum and pushes the push rod 303 to slide. The push rod 303 drives the second transmission rod 304 to rotate around the support column 305. The other end of the second transmission rod 304 pushes the cutting tool 307 towards the forming mold 215 via the connecting rod 306. The cutting tool 307 fits against the cutting surface 216 and cuts off the tail of the spring. The second transmission rod 304 forms a lever with the support column 305 as the fulcrum. The thrust can be amplified by selecting the ratio of the lever arms at its two ends. When the transition slope 4111 disengages from the third transmission wheel 302, the push rod 303 and the first transmission rod 301 reset under the action of the second spring 308, and the cutting tool 307 retracts, waiting for the next processing cycle.

[0052] Reference Figures 9 to 12The drive assembly 4 includes a drive motor 401 fixedly mounted on the frame 5. The output end of the drive motor 401 is connected to a transmission shaft 402, and an eleventh gear 403 is fixed to the outer side of the transmission shaft 402. A sixth rotating shaft 404 is rotatably mounted on the frame 5 and located on one side of the eleventh gear 403. A twelfth gear 405 and a thirteenth gear 406 are fixed sequentially on the outer side of the sixth rotating shaft 404, and the eleventh gear 403 and the thirteenth gear 406 are meshed together. A timing shaft 407 is rotatably mounted on the frame 5 and located on one side of the transmission shaft 402. The timing shaft 407 is the timing shaft described in this application. A fourteenth gear 408 and a drive gear disk 410 are fixed sequentially on its outer side. The top of the timing shaft 407 extends out of the top of the frame 5 and is fixed with a drive cam 409. The fourteenth gear 408 and the twelfth gear 405 are meshed together. An eighth rotating shaft 412 is rotatably mounted on the frame 5 and located on one side of the timing shaft 407. The sixteenth gear 414 and the fifteenth gear 413 are fixed on the outer side of the eighth rotating shaft 412 in sequence. The fifteenth gear 413 is positioned opposite to the drive gear disk 410 and is used for meshing with it. The sixteenth gear 414 is meshed with the sixth gear 134 in the wire feeding mechanism 1.

[0053] The gear transmission chain referred to in this application consists of the fifteenth gear 413, the eighth shaft 412, and the sixteenth gear 414. The fifteenth gear 413 is the input gear of the gear transmission chain, which is used to mesh with the meshing tooth part 4101 and disengage from the drive gear disk 410 when the non-meshing part 4102 is facing each other. The sixteenth gear 414 outputs power to the wire feeding gear set through the sixth gear 134 in the wire feeding mechanism 1.

[0054] Thus, the power of the drive motor 401 is transmitted to the timing shaft 407 after two stages of reduction via the transmission shaft 402, the eleventh gear 403, the thirteenth gear 406, the sixth rotating shaft 404, the twelfth gear 405, and the fourteenth gear 408. The timing shaft 407 is the only power output and timing reference shaft of the whole machine.

[0055] Three timing components are coaxially mounted on timing axis 407, namely: The first timing component, namely the drive gear disk 410, is an incomplete gear with teeth only partially present in the circumferential direction. It includes a meshing toothed portion 4101 with teeth and a non-meshing portion 4102 without teeth. The meshing toothed portion 4101 is used to mesh with the fifteenth gear 413, which serves as the input gear of the gear transmission chain. When the non-meshing portion 4102 is opposite to the fifteenth gear 413, the two disengage. The drive gear disk 410 is connected to the wire feeding mechanism 1 via the fifteenth gear 413, the eighth rotating shaft 412, the sixteenth gear 414, and the sixth gear 134, thereby converting the continuous rotation of the timing shaft 407 into the intermittent wire feeding of the wire feeding mechanism 1.

[0056] The second timing component, namely the drive cam 409, is fixed to the shaft end of the timing shaft 407 extending from the top of the frame 5. The drive cam 409 has a radially protruding protrusion 4091, which is connected to the lifting assembly 22 via the first transmission mechanism. The outer contour of the protrusion 4091 is a transition surface in which the radial protrusion gradually increases from zero to a apex along the rotation direction of the timing shaft 407, and then gradually decreases from the apex to zero.

[0057] The third timing component, namely the drive block 411, is radially fixed to the bottom of the drive gear disk 410, i.e., the side opposite to the drive cam 409. One end of the drive block 411 is fixed to the bottom of the timing shaft 407. An arc-shaped mounting groove 4103 concentrically arranged on the drive gear disk 410 is provided thereon. The other end of the drive block 411 is fixedly mounted on the inner side of the mounting groove 4103. After loosening the fastener between the drive block 411 and the mounting groove 4103, the other end of the drive block 411 can be adjusted in position along the mounting groove 4103 and then re-locked, thereby adjusting the circumferential phase of the drive block 411 relative to the meshing teeth 4101. The end of the drive block 411 is provided with a transition slope 4111 for adapting and abutting with the third transmission wheel 302. The transition slope 4111 is provided on the side of the drive block 411 facing the non-meshing part 4102.

[0058] The three timing components mentioned above are staggered circumferentially along timing axis 407 and have the following preset phase relationship (refer to...). Figure 10 , Figure 11 ): First, the orientation of the protrusion 4091 is the same as the orientation of the end segment of the meshing tooth 4101, and along the rotation direction of the timing axis 407, the starting end of the protrusion 4091 lags behind the starting end of the meshing tooth 4101 by a first phase angle α, and the ending end of the protrusion 4091 leads the ending end of the meshing tooth 4101 by a second phase angle β. That is, the time period during which the protrusion 4091 acts on the first transmission wheel 2206 is entirely within the time period during which the meshing tooth 4101 meshes with the fifteenth gear 413, with a "feeding only, not lifting" period corresponding to α and β at its beginning and end. In this embodiment, α and β can be taken as 10° to 60° respectively, and they can be equal or unequal. The feeding length corresponding to α forms the unfolded length of the straight section at one end of the compression spring, and the feeding length corresponding to β forms the unfolded length of the straight section at the other end of the compression spring.

[0059] Second, the circumferential position of the drive block 411 and its transition slope 4111 is within the angle range corresponding to the non-meshing part 4102. That is, the time period during which the drive block 411 pushes the third transmission wheel 302 is within the wire feeding stop period when the non-meshing part 4102 is opposite to the fifteenth gear 413, and the transition slope 4111 is located on the side of the drive block 411 facing the non-meshing part 4102, so that the drive block 411 gradually wedges into the third transmission wheel 302 with the slope after the wire feeding stops and smoothly pushes the cutting mechanism 3 to operate.

[0060] Since the three timing components are coaxially fixed on the same timing shaft 407, the aforementioned phase relationship is mechanically fixed once assembled, and is independent of the speed, load fluctuations, and start / stop of the drive motor 401. Therefore, the timing sequence of the three actions—wire feeding, lifting, and cutting—will not be disordered. Each rotation of the timing shaft 407 completes one processing cycle of a compression spring.

[0061] The working principle of the single-drive compression spring processing device provided in this application embodiment is as follows: Threading and feeding. The steel wire material of the spring is threaded through the inlet 15, passes through the conductor bar 16, and extends out from one side of the forming mold 215. After the drive motor 401 starts, it drives the transmission shaft 402 to rotate, which in turn drives the thirteenth gear 406 and the sixth rotating shaft 404 to rotate through the eleventh gear 403. The twelfth gear 405 on the sixth rotating shaft 404 drives the fourteenth gear 408 to rotate, thereby driving the timing shaft 407 and its drive gear 410, drive cam 409 and drive block 411 to rotate synchronously. When the drive gear 410 rotates to the point where the meshing teeth 4101 mesh with the fifteenth gear 413, it drives the fifteenth gear 413 to rotate, which in turn drives the eighth rotating shaft 412 and the sixteenth gear 414 to rotate, thereby driving the sixth gear 134 to rotate. When the sixth gear 134 rotates, the fourth gear 132 rotates synchronously, and the fourth gear 132 drives the seventh gear 142 to rotate synchronously in reverse. Simultaneously, the fifth gear 133 and the fourth gear 132 drive the ninth gear 172 and the tenth gear 173 to rotate, which in turn drives the first gear 112 and the third gear 122 to rotate synchronously in reverse, with the first gear 112 and the fourth gear 132 rotating in the same direction. Therefore, the second wire feeding disc 121 and the first wire feeding disc 111 rotate synchronously in opposite directions in the left-right direction, and the third wire feeding disc 131 and the fourth wire feeding disc 141 rotate synchronously in opposite directions, thereby clamping and feeding the steel wire forward. When the drive gear disc 410 rotates until the meshing teeth 4101 disengage from the fifteenth gear 413, the wire feeding mechanism 1 stops feeding the steel wire.

[0062] The wire is bent in the plane to form a straight section at the first end. When the wire fed by the wire feeding mechanism 1 comes into contact with the first forming wheel 213, it changes direction, and then contacts the second and third forming wheels 213 in sequence. Finally, it enters the space between the forming wheel 213 and the forming mold 215 from one side of the forming mold 215, and comes out from the other side of the forming mold 215, completing the bending of the wire. At the same time, the timing shaft 407 drives the cam 409 to rotate synchronously when it rotates. Since the starting end of the protrusion 4091 lags behind the starting end of the meshing tooth 4101 by a first phase angle α, when the meshing tooth 4101 just begins to mesh with the fifteenth gear 413, the protrusion 4091 has not yet moved to the position of abutting against the first transmission wheel 2206; during the period from the start of meshing of the meshing tooth 4101 to the start of the protrusion 4091 abutting against the first transmission wheel 2206 and pushing it to move, the ejector pin 2202 remains at the initial height, and the steel wire only bends in a plane perpendicular to the axis of the forming mold 215, thereby forming a straight section at the first end of the compression spring.

[0063] While bending and lifting, the middle spiral section is formed. As the meshing gear 4101 continues to rotate, while maintaining engagement with the fifteenth gear 413, it rotates until the protrusion 4091 begins to abut against the first transmission wheel 2206 and pushes it to move. The protrusion 4091 pushes one end of the first transmission plate 2205 to move through the first transmission wheel 2206, thereby driving the first transmission plate 2205 to rotate. This causes the push rod 2210 to move toward the end of the transmission angle plate 2207 and pushes one end of the transmission angle plate 2207 toward the lifting drive plate 2209 to rotate. This, in turn, drives the second transmission wheel 2208 to rotate downward, thereby pressing one end of the lifting drive plate 2209 downward and causing the end of the lifting drive plate 2209 near the top block 2203 to tilt upward. This gradually pushes the top block 2203 upward, causing the lifting rod 2201 to gradually rise and simultaneously compress the first spring 2204. As a result, the ejector pin 2202 gradually pushes the wire upward during the bending process, causing it to move upward while bending, thus forming a spiral structure. As the contact point between the protrusion 4091 and the first transmission wheel 2206 moves from the starting end of the protrusion 4091 to its apex and then from the apex to the ending end, the lifting speed of the ejector pin 2202 gradually increases and then gradually decreases. Therefore, the pitch of the spiral segment changes synchronously, first from small to large and then from large to small, thus forming a smooth transition between the straight sections at both ends and the spiral section in the middle.

[0064] The wire is bent in the plane to form the straight section at the second end. When the drive cam 409 continues to rotate until the protrusion 4091 moves away from the first drive wheel 2206, and until the meshing tooth 4101 disengages from the fifteenth gear 413 (i.e., the period corresponding to the second phase angle β), the protrusion 4091 cannot push the first drive wheel 2206, and the ejector pin 2202 returns to its original position under the action of the first spring 2204. During this process, the wire is still bent in the plane, thus forming the straight section at the second end of the compression spring.

[0065] Stop feeding and cut the wire. When the drive gear 410 moves to the point where the meshing teeth 4101 disengage from the fifteenth gear 413, i.e., the non-meshing part 4102 faces the fifteenth gear 413, the drive gear 410 can no longer drive the fifteenth gear 413 to rotate, and the wire stops feeding. As the drive gear 410 continues to rotate, the transition slope 4111 of the drive block 411 gradually contacts the third transmission wheel 302 and pushes it to move, thereby pushing the push rod 303 to slide through the first transmission rod 301, which in turn drives the second transmission rod 304 to rotate around the support column 305 as the fulcrum, thereby pushing the cutting tool 307 to slide through the connecting rod 306. The cutting tool 307 then contacts the cutting surface 216 to cut off the end of the processed spring, thus completing the spring processing. Since the wire is stationary at this time, the cut is flat and the wire will not be damaged due to simultaneous feeding and cutting.

[0066] Reset and Cycle. When the transition slope 4111 disengages from the third transmission wheel 302, the push rod 303 and the first transmission rod 301 reset under the action of the second spring 308, and the cutting tool 307 retracts, awaiting the next processing cycle. When the protrusion 4091 disengages from the first transmission wheel 2206, the lifting rod 2201 and the first transmission wheel 2206 reset under the action of the first spring 2204, awaiting the next processing cycle. The timing shaft 407 continues to rotate, thus entering the next processing cycle. This cycle continues continuously and automatically to complete the batch processing of compression springs.

[0067] The device in this application embodiment can adjust the specifications of the processed compression spring in a purely mechanical manner without replacing the drive train or modifying the control program: First, adjust the number of turns and the total length of the spring. (Refer to...) Figure 10 and Figure 11The drive gear disks 410 are configured as two stacked disks, one above the other. Both drive gear disks 410 are positioned opposite the fifteenth gear 413, meaning the tooth width of the fifteenth gear 413 spans the height range of both drive gear disks 410. The meshing teeth 4101 of the two drive gear disks 410 can be aligned or staggered. When the two meshing teeth 4101 are aligned, the fifteenth gear 413 is driven only within the arc segment covered by the two meshing teeth 4101. This results in the shortest effective meshing arc length of the meshing teeth 4101, the shortest wire feed length in one processing cycle, and the fewest number of spring coils. When the two meshing teeth 4101 are staggered circumferentially, the fifteenth gear 413 is driven as long as either meshing tooth 4101 meshes with it. Therefore, the effective meshing arc length increases with the increase of the staggered angle, the wire feed length in one processing cycle increases accordingly, and the number of spring coils and the total length of the springs also increase. Therefore, by stacking two drive gear discs 410 and aligning or staggering the meshing teeth 4101, the circumferential length of the meshing teeth 4101 and the non-meshing teeth 4102 can be adjusted, thereby adjusting the wire feed length and the number of spring coils.

[0068] Secondly, adjust the outer diameter of the spring. (Refer to...) Figure 7 Rotate the three first adjusting screws 214 respectively to move the corresponding support rods 212 radially inward or outward, thereby changing the radial distance between the three forming wheels 213 and the forming mold 215, that is, changing the bending radius of the steel wire, thereby adjusting the outer diameter of the compression spring; or only a few of the first adjusting screws 214 can be finely adjusted to compensate for the difference between the steel wire diameter tolerance and the material springback, and improve the roundness of the spring.

[0069] Third, adjust the inner diameter of the spring. (Refer to...) Figure 13 By rotating the second adjusting screw 219 in the reverse direction to retract the pressure block 218 and loosen the forming mold 215, and then removing and replacing it with a forming mold 215 with a different outer diameter, the second adjusting screw 219 is rotated in the forward direction to advance the pressure block 218 to press and position it, thereby changing the inner diameter of the compression spring.

[0070] Fourth, adjust the cutting-off time. (Refer to...) Figure 11 Loosen the fasteners between the drive block 411 and the mounting groove 4103, and then re-lock the free end of the drive block 411 after changing its circumferential position along the arc-shaped mounting groove 4103. This will change the phase of the drive block 411 relative to the meshing teeth 4101, thereby changing the timing of the cutting action during the wire feeding stop period to accommodate different spring lengths and cutting allowances.

[0071] Fifth, adjust the length of the straight sections at both ends. During the assembly stage, by changing the mounting angle of the drive cam 409 relative to the drive gear 410, that is, by changing the first phase angle α and the second phase angle β, the unfolded length of the straight sections at both ends of the compression spring can be adjusted, and the lengths of the straight sections at both ends can be made equal or unequal.

[0072] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A single-drive compression spring processing device, characterized in that, include: Rack (5); A wire feeding mechanism (1) is mounted on the frame (5) and is used to intermittently feed the wire. The forming mechanism (2) includes a forming mold (215), a plurality of forming wheels (213) arranged circumferentially around the forming mold, and an ejector pin (2202) that can be raised and lowered along the axial direction of the forming mold. The forming wheels (213) and the forming mold form a forming channel for bending the wire into a ring. The ejector pin (2202) is used to lift the wire along the axial direction of the forming mold while bending it. The cutting mechanism (3) includes a cutting tool (307) for cutting off the tail of the spring. The drive assembly (4) includes a drive motor (401) and a timing shaft (407) driven by the drive motor to rotate. The timing shaft is coaxially provided with a drive gear disk (410), a drive cam (409), and a drive block (411). The drive gear disk (410) has a meshing tooth portion (4101) and a non-meshing portion (4102) in sequence in the circumferential direction and is connected to the wire feeding mechanism (1) via a gear transmission chain. The input gear of the gear transmission chain meshes with the meshing tooth portion (4101) and disengages from the non-meshing portion (4102). The drive cam (409) has a protrusion portion (4091) and is connected to the ejector pin (2202) via a first transmission mechanism. The drive block (411) is connected to the cutting tool (307) via a second transmission mechanism. The meshing teeth (4101), the protrusion (4091), and the drive block (411) are staggered circumferentially along the timing axis. Each rotation of the timing axis constitutes a processing cycle. Within the same processing cycle, the time period during which the protrusion (4091) drives the ejector pin (2202) is within the time period during which the meshing teeth (4101) drives the wire feeding mechanism (1) to feed the wire. The time period during which the drive block (411) drives the cutting tool (307) is within the time period during which the non-meshing part (4102) stops feeding the wire.

2. The single-drive compression spring processing device according to claim 1, characterized in that, Along the rotation direction of the timing axis (407), the starting end of the protrusion (4091) lags behind the starting end of the meshing tooth (4101) by a first phase angle, and the ending end of the protrusion (4091) leads the ending end of the meshing tooth (4101) by a second phase angle. The wire lengths corresponding to the first phase angle and the second phase angle respectively form the straight sections at both ends of the compression spring. The outer contour of the protrusion (4091) is a transition surface in which its radial protrusion gradually increases from zero to the apex along the rotation direction of the timing axis (407), and then gradually decreases from the apex to zero.

3. The single-drive compression spring processing device according to claim 1, characterized in that, The drive block (411) is radially disposed on the side of the drive gear disk (410) away from the drive cam (409). One end of the drive block (411) is fixed on the timing shaft (407). The drive gear disk (410) has an arc-shaped mounting groove (4103) concentric with the timing shaft (407). The other end of the drive block (411) is adjustablely fixed in the mounting groove (4103). The end of the drive block (411) is provided with a transition slope (4111) for adapting and abutting with the second transmission mechanism. The transition slope (4111) is disposed on the side of the drive block (411) facing the non-engaging part (4102).

4. The single-drive compression spring processing device according to claim 3, characterized in that, Two drive gear disks (410) are stacked along the axial direction of the timing axis (407). Both drive gear disks (410) are positioned opposite to the input gear of the gear transmission chain. The meshing teeth (4101) of the two drive gear disks (410) are aligned or staggered with each other in the circumferential direction to change the effective arc length of the meshing teeth (4101) meshing with the input gear.

5. The single-drive compression spring processing device according to claim 1, characterized in that, The drive motor (401) is fixedly mounted on the frame (5). The output end of the drive motor (401) is connected to a transmission shaft (402). An eleventh gear (403) is fixed on the outside of the transmission shaft (402). A sixth rotating shaft (404) is rotatably mounted on the frame (5) and located on one side of the eleventh gear (403). A twelfth gear (405) and a thirteenth gear (406) are sequentially fixed on the outside of the sixth rotating shaft (404) along the axial direction. The eleventh gear (403) and the thirteenth gear (406) are meshed together. A timing shaft (407) is rotatably mounted on the frame (5) and located on one side of the transmission shaft (402). A fourteenth gear is sequentially fixed on the outside of the timing shaft (407) along the axial direction. The gear (408) and the drive gear (410) are connected. The top of the timing shaft (407) extends out of the frame (5) and is fixed with the drive cam (409). The fourteenth gear (408) meshes with the twelfth gear (405). The gear transmission chain includes an eighth shaft (412) rotatably mounted on the frame (5) and located on one side of the timing shaft (407), and a sixteenth gear (414) and a fifteenth gear (413) fixed axially to the outside of the eighth shaft (412). The fifteenth gear (413) is the input gear of the gear transmission chain and is used to mesh with the meshing tooth (4101). The sixteenth gear (414) is connected to the wire feeding mechanism (1).

6. The single-drive compression spring processing device according to claim 5, characterized in that, The wire feeding mechanism (1) includes a wire inlet head (15) fixed to the top of the frame (5), a wire guide strip (16) fixedly installed on the top of the frame (5) and facing the wire inlet head (15), and a first rotating shaft (11), a second rotating shaft (12), a third rotating shaft (13), and a fourth rotating shaft (14) rotatably installed on the frame (5). The wire outlet end of the wire guide strip (16) faces the forming mold (215). The tops of the first rotating shaft (11), the second rotating shaft (12), the third rotating shaft (13), and the fourth rotating shaft (14) extend out of the frame (5) and are fixed with a first wire feeding reel (111), a second wire feeding reel (121), a third wire feeding reel (131), and a fourth wire feeding reel (141). The third rotating shaft (13) and the first rotating shaft (11) are sequentially arranged on one side of the conductor bar (16) along the wire feeding direction, and the second rotating shaft (12) and the fourth rotating shaft (14) are sequentially arranged on the other side of the conductor bar (16) along the wire feeding direction. The second rotating shaft (12) and the first rotating shaft (11) are directly opposite each other, and the fourth rotating shaft (14) and the third rotating shaft (13) are directly opposite each other, so that the first wire feeding reel (111) and the second wire feeding reel (121), the third wire feeding reel (131) and the fourth wire feeding reel (141) respectively constitute two pairs of wire feeding reels for clamping the wire. The wire inlet head (15), the conductor bar (16) and the clamping positions of the two pairs of wire feeding reels together define the wire feeding channel of the wire. A first gear (112) and a second gear (113) are fixed axially on the outer side of the first rotating shaft (11). A third gear (122) is fixed axially on the outer side of the second rotating shaft (12). A fourth gear (132), a fifth gear (133), and a sixth gear (134) are fixed axially on the outer side of the third rotating shaft (13). A seventh gear (142) is fixed axially on the outer side of the fourth rotating shaft (14). A fifth rotating shaft (17) is rotatably mounted on the frame (5). A tenth gear (173), a ninth gear (174), and a twentieth gear (175) are fixed axially on the outer side of the fifth rotating shaft (17). 172) and the eighth gear (171); the first gear (112) is located between the third gear (122) and the tenth gear (173) and meshes with them respectively; the fourth gear (132) is located between the seventh gear (142) and the tenth gear (173) and meshes with them respectively; the fifth gear (133) meshes with the ninth gear (172); the eighth gear (171) meshes with the second gear (113); and the sixth gear (134) meshes with the sixteenth gear (414).

7. The single-drive compression spring processing device according to claim 1, characterized in that, The forming mechanism (2) includes a bending assembly (21), which includes a mounting block (217) fixed to the top of the frame (5) and a first mounting plate (211) fixed to the top of the frame (5) and located on the side of the forming mold (215) away from the wire feeding mechanism (1). The forming mold (215) is detachably disposed inside the mounting block (217). A pressure block (218) is slidably disposed on the frame (5) and located on the side of the mounting block (217). A second adjusting screw (219) is threadedly connected to the frame (5). The pressure block (218) is rotatably connected to the end of the second adjusting screw (219) and is used to press the forming mold (215) under the drive of the second adjusting screw (219). A molding die (215) is used to position it; a plurality of support rods (212) are slidably provided on the inner side of the first mounting plate (211) along the circumference of the molding die (215), and the molding wheel (213) is rotatably provided on the end of the support rod (212) facing the molding die (215). A first adjusting screw (214) is threadedly connected to the end of the first mounting plate (211) opposite to the corresponding molding wheel (213). The support rod (212) is rotatably connected to the end of the corresponding first adjusting screw (214) so ​​as to adjust the radial distance between the corresponding molding wheel (213) and the molding die (215) by rotating the first adjusting screw (214).

8. The single-drive compression spring processing device according to claim 1, characterized in that, The molding mechanism (2) includes a lifting assembly (22), which includes a lifting rod (2201) that is vertically slidably mounted on the frame (5). The ejector pin (2202) is fixed to the top of the lifting rod (2201) and to the side near the molding die (215). A top block (2203) is fixed to the middle of the outer side of the lifting rod (2201). A first spring (2204) is sleeved on the outer side of the lifting rod (2201) and above the top block (2203). The two ends of the first spring (2204) abut against the frame (5) and the top block (2203) respectively. The first transmission mechanism includes a first transmission plate (2205) rotatably disposed on the top of the frame (5) and located on the side of the drive cam (409) away from the molding die (215). A first transmission wheel (2206) for adapting and abutting against the protrusion (4091) is rotatably connected to one end of the first transmission plate (2205) near the drive cam (409). A push rod (2210) is fixed to one end of the first transmission plate (2205) away from the first transmission wheel (2206). A push rod (2210) is fixed on the frame (5) and located on the side of the push rod (2210). An L-shaped transmission angle plate (2207) is rotatably provided on the side. A second transmission wheel (2208) is rotatably provided on one end of the transmission angle plate (2207) away from the push rod (2210). A lifting drive plate (2209) is rotatably provided on the frame (5) between the top block (2203) and the second transmission wheel (2208). One end of the lifting drive plate (2209) is located below and abuts against the second transmission wheel (2208), and the other end of the lifting drive plate (2209) is located below and abuts against the top block (2203).

9. The single-drive compression spring processing device according to claim 1, characterized in that, The forming mold (215) has a cutting surface (216) on the side away from the forming wheel (213), and the cutting tool (307) is slidably disposed on the frame (5) and located on the side of the cutting surface (216) away from the forming wheel (213). The second transmission mechanism includes a first transmission rod (301), a push rod (303), a second transmission rod (304), and a connecting rod (306); the first transmission rod (301) is rotatably mounted on the frame (5), and the end of the first transmission rod (301) near the drive gear (410) is rotatably connected to a third transmission wheel (302) for fitting and abutting against the drive block (411); the push rod (303) is slidably mounted on the frame (5), and one end of the push rod (303) abuts against one side of the first transmission rod (301); a support column (305) is fixed on one side of the frame (5), and the support column (305) is located between the push rod (303) and the connecting rod (306). Between 06), the middle part of the second transmission rod (304) is rotatably connected to the end of the support column (305), one end of the second transmission rod (304) is rotatably connected to the other end of the top rod (303), and the other end of the second transmission rod (304) is rotatably connected to the cutting tool (307) through the connecting rod (306). The top rod (303) is located below the connecting rod (306). A second spring (308) is connected between the end of the second transmission rod (304) near the top rod (303) and the frame (5). In its natural state, the top rod (303) abuts against one side of the first transmission rod (301) under the action of the second spring (308).

10. A method for processing compression springs, employing the single-drive compression spring processing device according to any one of claims 1 to 9, characterized in that, The following steps are included in one processing cycle, which is formed by one revolution of the timing axis (407): S1. Forming of the straight section at the beginning: The drive motor (401) drives the timing shaft (407) to rotate, the meshing tooth (4101) engages and drives the wire feeding mechanism (1) to transport the wire through the gear transmission chain, and the wire is bent into a ring between the forming wheel (213) and the forming mold (215); in this step, the protrusion (4091) has not yet abutted against the first transmission mechanism, the ejector pin (2202) is held at the initial height, and the wire is bent in a plane perpendicular to the axial direction of the forming mold (215) to form a straight section at one end of the compression spring; S2, Spiral Segment Forming: The timing shaft (407) continues to rotate, the meshing teeth (4101) remain engaged, and the wire feeding mechanism (1) continues to feed the wire. At the same time, the protrusion (4091) abuts against the first transmission mechanism and drives the ejector pin (2202) through the first transmission mechanism, so that the ejector pin (2202) gradually lifts the wire along the axial direction of the forming mold (215) while the wire is bent, forming the spiral segment; S3, Straight section forming at the tail end: The timing shaft (407) continues to rotate until the protrusion (4091) disengages from the first transmission mechanism, the ejector pin (2202) resets, while the meshing teeth (4101) remain engaged and continue to feed the wire. The wire is bent again in a plane perpendicular to the axial direction of the forming mold (215) to form a straight section at the other end of the compression spring. S4, Cutting: The timing shaft (407) continues to rotate until the non-meshing part (4102) is opposite to the input gear of the gear transmission chain, the wire feeding mechanism (1) stops feeding the wire, and at the same time the drive block (411) abuts against the second transmission mechanism and drives the cutting tool (307) to move toward the forming mold (215) through the second transmission mechanism, cutting off the spring tail when the wire is stationary; S5. Reset: The timing axis (407) continues to rotate until the drive block (411) disengages from the second transmission mechanism, and the cutting tool (307) resets and enters the next processing cycle.

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