A spring forming device

Abstract

The present invention relates to the field of spring production, and specifically to a spring forming device, which includes a frame. A press arc unit is arranged at the middle position of the frame, and two pressing wheels driven by servo motors are arranged at the upper and lower positions on one side of the frame. A winding unit is arranged on one side of the pressing wheel, and an annealing unit is arranged on one side of the winding unit; in the present invention, for this spring forming device, a press arc unit is provided. The tungsten steel rod in the press arc unit has high self-hardness and can continuously and for a long time extrude the flat steel strip, ensuring the stability of the press arc process of the flat steel strip. At the same time, an annealing unit is provided, which can continuously heat and anneal the spring tongues of each reverse-wound spring, improving the production and manufacturing efficiency of the reverse-wound spring. In addition, the centralized design of the press arc unit, punching unit and annealing unit makes the spring forming device highly integrated, with a small layout floor area, and can be applied to factories with limited area.

Description

Technical Field

[0001] The present invention relates to the technical field of spring production, and in particular to a spring forming device. Background Art

[0002] A spring is a mechanical part that uses elasticity to work. There are various types of springs. Classified by shape, there are mainly helical springs, scroll springs, leaf springs, special-shaped springs, etc. Among them, scroll springs can be further divided into reverse-wound springs and regular-wound springs.

[0003] A reverse-wound spring generally refers to a spring whose winding direction is opposite to that of a regular-wound spring during the manufacturing process. In a regular-wound spring, the winding order is the same as the order in the free state, that is, after winding, the curvature radius of its free state decreases from the outside to the inside in sequence. While in a reverse-wound spring, the winding order is exactly the opposite, that is, after winding, the curvature radius of its free state increases from the inside to the outside in sequence.

[0004] When manufacturing a reverse-wound spring, generally, the flat steel strip is bent to a certain arc. The certain arc can control the resilience of the reverse-wound spring to ensure that after the flat steel strip is wound, the curvature radius of its free state increases from the inside to the outside in sequence, forming a regular reverse-wound spring. However, when the existing equipment or device produces a reverse-wound spring, it is difficult to bend the flat steel strip to a stable arc, resulting in unstable spring production quality during winding, and the curvature radius of its free state is not uniform from the inside to the outside after winding.

[0005] And for each wound reverse-wound spring after cutting, its spring tongue needs to be annealed after stamping and cutting to eliminate stress so that the spring tongue is not easily broken. However, the existing production equipment or device does not have a link for annealing synchronously during processing, and it still needs to be transported to a dedicated annealing device for annealing twice. The transportation and subsequent placement both take a lot of time, making the entire manufacturing process of the reverse-wound spring inefficient.

[0006] Therefore, a spring forming device is proposed for the above problems. Summary of the Invention

[0007] For this reason, the technical problem to be solved by the present invention is to overcome the problem in the prior art that when producing a reverse-wound spring, it is difficult to bend the flat steel strip to a stable arc, resulting in unstable spring production quality during winding, and the curvature radius of its free state is not uniform from the inside to the outside after winding.

[0008] To solve the above technical problem, the present invention provides a spring forming device, including a frame. A press arc unit is arranged at the middle position of the frame. Two pressing wheels driven by servo motors are arranged at the upper and lower positions on one side of the frame. A winding unit is arranged on one side of the pressing wheel, and an annealing unit is arranged on one side of the winding unit;

[0009] The arc pressing unit includes a first cylinder fixedly connected to the frame. A pressing block is fixedly connected to the output end of the first cylinder. Arc-shaped openings are symmetrically formed at the two edges of the lower end of the pressing block. A tungsten steel rod is fixedly connected between the two arc-shaped openings. Guide wheels are arranged on the outer sides of the two arc-shaped openings respectively. The two guide wheels and the tungsten steel rod form a processing channel.

[0010] The winding unit includes a punching component and a winding component.

[0011] The punching component includes a hydraulic cylinder. A punching block is fixedly connected to the output end of the hydraulic cylinder. A base is arranged below the punching block. A groove adapted to the punching block is provided on the base. A winding component is arranged on one side of the base. The winding component includes an inverted U-shaped cover. A winding wheel is arranged inside the U-shaped cover. A slot is radially formed in the winding wheel. One end of the slot penetrates through the winding wheel. A winding motor is fixedly connected to the other end of the winding wheel.

[0012] The annealing unit includes an L-shaped material guiding plate. A guiding plate is arranged between one end of the material guiding plate and the U-shaped cover. A furnace body is arranged below the material guiding plate. A row of burners is provided on the furnace body. The burners are arranged along the length direction of the material guiding plate.

[0013] In an embodiment of the present invention, a plurality of adjusting wheels are arranged on the other side of the frame at the same horizontal height. An annular groove is radially formed in the outer ring of each adjusting wheel, guide wheel and pressing wheel. An adjusting plate is arranged between the pressing wheel and the adjacent guide wheel. A horizontal groove is formed on the upper surface of the adjusting plate. A guiding cover is arranged between the pressing wheel and the base.

[0014] In an embodiment of the present invention, a jack is formed at the middle position of the lower end of the pressing block. A tungsten steel rod is inserted into the jack. A fixing plate is arranged on the outer side of the lower end of the pressing block. The upper end of the fixing plate is fixedly connected to the pressing block by bolts. The lower end of the fixing plate presses against the end face of the tungsten steel rod.

[0015] In an embodiment of the present invention, an oil guiding pipe is arranged on the side wall of the pressing block close to the adjusting wheel. The end of the oil guiding pipe is vertically bent and extends vertically upward. A sleeve is arranged at the end of the oil guiding pipe. The upper end of the sleeve is closed. An oil inlet pipe is communicated with the outer side of the lower end of the sleeve. The end of the oil guiding pipe can slide up and down in the sleeve. The bent point of the oil guiding pipe is communicated with an oil outlet pipe. The oil outlet end of the oil outlet pipe is arranged above the space between the guide wheel and the adjusting wheel.

[0016] In an embodiment of the present invention, a scraping plate is arranged on the adjusting plate close to the guide wheel. The scraping plate is fixedly connected in the horizontal groove by bolts. An oil guiding plate is arranged below the position of the adjusting plate close to the guide wheel.

[0017] In an embodiment of the present invention, the punching block includes an upper punching block and a lower punching block. The upper punching block and the lower punching block are fixedly connected by a plurality of columns. A bearing is arranged on the outer ring of each column.

[0018] In an embodiment of the present invention, the winding unit further includes a lead screw rotatably connected to the upper end surface of the U-shaped cover. Through holes are formed on both sides of the U-shaped cover. Execution blocks are symmetrically fixed to the ends of the lead screw. One of the execution blocks is fixed with a U-shaped insertion plate, and the insertion plate can reciprocate along the axis of the through hole;

[0019] The other execution block is fixed with a winding motor, and a winding wheel is fixed to the output end of the winding motor. A U-shaped relief groove is also formed on the winding wheel. The part between the horizontal part of the relief groove and the insertion slot forms two upper and lower pressing plates. The upper and lower pressing plates are respectively connected to the top surface and the bottom surface of the relief groove through springs, and wedge-shaped blocks are provided on the upper surface of the upper pressing plate and the lower surface of the lower pressing plate. The insertion plate can be inserted between the pressing plate and the relief groove and press on the wedge-shaped block.

[0020] In an embodiment of the present invention, a second cylinder is provided at one end of the material guiding plate, and a pushing block is fixed to the output end of the second cylinder. The pushing block can push the reverse winding spring that slides from the guiding plate onto the material guiding plate to the other end position of the material guiding plate;

[0021] A third cylinder is provided on the side wall at the end of the guiding plate, and a baffle is fixed to the output end of the third cylinder. The baffle can restrain the reverse winding spring that slides from the guiding plate onto the material guiding plate at one side position of the pushing block.

[0022] In an embodiment of the present invention, a restraining plate is provided above the material guiding plate. The cross-section of the restraining plate is L-shaped. A gap is left between the vertical side plate of the restraining plate and the horizontal side plate of the material guiding plate. An inclined side is provided at the end of the restraining plate close to the pushing block, and the inclined side is provided on the vertical side plate of the restraining plate.

[0023] In an embodiment of the present invention, anti-slip patterns are provided on the surface of each pressing wheel.

[0024] The above technical solutions of the present invention have the following advantages compared with the prior art:

[0025] 1. In the present invention, for this spring forming device, an arc pressing unit is provided. The tungsten steel rod in the arc pressing unit has high self-hardness and can continuously and for a long time extrude the flat steel strip, ensuring the stability of the arc pressing process of the flat steel strip. At the same time, an annealing unit is provided, which can continuously heat and anneal the tongue of each reverse winding spring, improving the production and manufacturing efficiency of the reverse winding spring. In addition, the centralized design of the arc pressing unit, punching unit and annealing unit makes the spring forming device highly integrated and has a small layout floor area, and can be applied to factories with limited area.

[0026] 2. In the present invention, an insertion plate is provided in cooperation with the winding wheel. When the insertion plate is inserted into the relief groove, the insertion plate will press the wedge-shaped block, and the two pressing plates will move closer synchronously and press on the surface of the flat steel strip, that is, press on the U-shaped part. Then, the winding motor is driven, and the winding wheel can stably wind the flat steel strip. Brief Description of the Drawings

[0027] In order to make the content of the present invention easier to be clearly understood, the following further describes the present invention in detail according to specific embodiments of the present invention and in conjunction with the drawings.

[0028] Figure 1 Is the first perspective three-dimensional view of the spring forming device in the present invention;

[0029] Figure 2 Is the second perspective three-dimensional view of the spring forming device in the present invention;

[0030] Figure 3 Is the third perspective three-dimensional view of the spring forming device in the present invention;

[0031] Figure 4 Is the front view of the spring forming device in the present invention;

[0032] Figure 5 Is the schematic diagram of the punching of section B in the present invention;

[0033] Figure 6 Is the three-dimensional view of the reverse-wound spring in the present invention;

[0034] Figure 7 Is the three-dimensional view of the arc pressing unit in the present invention;

[0035] Figure 8 Is the front view of the arc pressing unit in the present invention;

[0036] Figure 9 Is the schematic diagram of the tungsten steel rod pressing the flat steel strip in the present invention;

[0037] Figure 10 Is the three-dimensional view of the winding unit in the present invention;

[0038] Figure 11 Is the top view of the base in the present invention;

[0039] Figure 12 Is the three-dimensional view of the winding assembly in the present invention;

[0040] Figure 13 Is the three-dimensional view of the base in the present invention;

[0041] Figure 14 Is the three-dimensional view of the punching block in the present invention;

[0042] Figure 15 Is the side view of the punching block in the present invention;

[0043] Figure 16 Is the schematic diagram of the cooperation between the insertion plate and the winding wheel in the present invention;

[0044] Figure 17It is a three-dimensional diagram of the winding wheel in the present invention;

[0045] Figure 18 A first perspective stereoscopic view of the annealing unit in the present invention;

[0046] Figure 19 A second perspective stereoscopic view of the annealing unit in the present invention;

[0047] Figure 20 A three-dimensional diagram of the adjustment plate of the present invention;

[0048] Figure 21 It is a three-dimensional diagram of the cooperation between the oil guide pipe and the pressing block in the present invention;

[0049] Figure 22 It is a schematic diagram of the cooperation between the oil guide pipe and the casing in the present invention.

[0050] In the figure: 101, rewinding spring; 1, frame; 2, pressure wheel; 3, No. 1 cylinder; 4, pressure block; 5, arc-shaped mouth; 6, tungsten steel rod; 7, guide wheel; 8, hydraulic cylinder; 9, punching block; 10, base; 11, groove; 12, U-shaped cover; 13, winding wheel; 14, slot; 15, guide plate; 16, guide plate; 17, furnace body; 18, stove head; 19, adjustment switch; 20, adjustment wheel; 21, annular groove; 22, adjustment plate; 23, horizontal groove; 24, guide cover; 25, jack; 26 , fixing plate; 27, oil guide pipe; 28, casing; 29, oil inlet pipe; 30, oil outlet pipe; 31, scraper; 32, oil guide plate; 33, upper punch block; 34, lower punch block; 35, bearing; 36, screw rod; 37, through hole; 38, actuator block; 39, plug plate; 40, give way groove; 41, extrusion plate; 42, spring; 43, wedge block; 44, No. 2 cylinder; 45, push block; 46, No. 3 cylinder; 47, restraint plate; 48, bevel edge; 49, anti-slip pattern; 50, limit plate; 51, baffle. DETAILED DESCRIPTION

[0051] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0052] Reference Figure 1 - Figure 20 A spring forming device comprises a frame 1, an arc pressing unit is arranged in the middle of the frame 1, two pressing wheels 2 driven by a servo motor are arranged at upper and lower positions on one side of the frame 1, a winding unit is arranged on one side of the pressing wheel 2, and an annealing unit is arranged on one side of the winding unit;

[0053] The arc pressing unit includes a first cylinder 3 fixedly connected to the frame 1. The output end of the first cylinder 3 is fixedly connected with a pressing block 4. Arc-shaped openings 5 are symmetrically formed at the two edges of the lower end of the pressing block 4. A tungsten steel rod 6 is fixedly connected between the two arc-shaped openings 5. Guide wheels 7 are arranged on the outer sides of the two arc-shaped openings 5. The two guide wheels 7 and the tungsten steel rod 6 form a processing channel.

[0054] The winding unit includes a punching and cutting assembly and a winding assembly.

[0055] The punching and cutting assembly includes a hydraulic cylinder 8. The output end of the hydraulic cylinder 8 is fixedly connected with a punching block 9. A base 10 is arranged below the punching block 9. A groove 11 adapted to the punching block 9 is arranged on the base 10. A winding assembly is arranged on one side of the base 10. The winding assembly includes an inverted U-shaped cover 12. A winding wheel 13 is arranged inside the U-shaped cover 12. Slots 14 are radially formed in the winding wheel 13. One end of the slots 14 penetrates through the winding wheel 13. A winding motor is fixedly connected to the other end of the winding wheel 13.

[0056] The annealing unit includes an L-shaped material guiding plate 15. A guiding plate 16 is arranged between one end of the material guiding plate 15 and the U-shaped cover 12. A furnace body 17 is arranged below the material guiding plate 15. A row of burners 18 are arranged on the furnace body 17. The burners 18 are arranged along the length direction of the material guiding plate 15.

[0057] Loading: As shown in Figure 4 During the feeding process of the flat steel strip, first, one end of the flat steel strip enters from one side of the right guide wheel 7 and enters the processing channel above the right guide wheel 7. The flat steel strip penetrates below the tungsten steel rod 6 and extends obliquely upward to above the left guide wheel 7, and then extends between the upper and lower pressing wheels 2. The two pressing wheels 2 are driven by a servo motor, and the rotation directions of the two pressing wheels 2 are opposite. As shown in Figure 4 As shown, the upper pressing wheel 2 rotates clockwise, and the lower pressing wheel 2 rotates counterclockwise. By relying on the extrusion of the two pressing wheels 2 on the flat steel strip, the flat steel strip can be rubbed and moved. During the movement, the tungsten steel rod 6 presses the arc of the flat steel strip, the punching block 9 punches and cuts off the flat steel strip of a specified length, and the winding wheel 13 winds the punched and cut flat steel strip.

[0058] Arc pressing: When the flat steel strip moves between the two guide wheels 7, the first cylinder 3 is driven. The first cylinder 3 drives the pressing block 4 to move downward. At the same time, the tungsten steel rod 6 on the pressing block 4 presses down the flat steel strip between the two guide wheels 7. That is, as the flat steel strip moves, the tungsten steel rod 6 continuously presses down the flat steel strip, pressing a curvature on the flat steel strip, and then moving to below the punching block 9; the arc pressing travel of the flat steel strip by the tungsten steel rod 6 is the winding length of the finished reverse-wound spring 101. The winding length section is the A section, while the tongue length of the reverse-wound spring 101 is not within the arc pressing travel range, and the tongue length section is the B section. And the length of the A section can be determined by the number of rotation turns of the two pressing wheels 2. When the length of the A section reaches the specified length, the first cylinder 3 drives the pressing block 4 to move upward, and the tungsten steel rod 6 no longer presses down the flat steel strip. Then the pressing wheels 2 rub the flat steel strip to move a length again, and this length is the tongue length B section of the reverse-wound spring 101. Next, punching is performed;

[0059] Punching: The B section moves above the base 10 and is placed at the notch position of the groove 11. And the groove 11 is U-shaped. The punching block 9 is also designed to fit the shape of the groove 11. Driven by the hydraulic cylinder 8, the punching block 9 punches downward on the B section, and the B section is punched into the state as shown in Figure 5 shown, the U-shaped part and the tongue part. During the punching process, the winding wheel 13 winds the A section;

[0060] Winding: After punching is completed, the U-shaped part becomes the tail of the A section, and the tongue part becomes the head of the A section. The tail is placed in the slot 14. The winding motor drives the winding wheel 13 to rotate and winds the A section, and the tongue is not wound. This process completes the blank of the reverse-wound spring 101. Then the blank is separated from the winding wheel 13, and the blank slides obliquely downward along the guide plate 16 onto the guide plate 15, and then annealing treatment is carried out;

[0061] Annealing and blanking: Natural gas can be injected into the furnace body 17, and the flame discharged from the burner 18 heats and anneals the tongue of the blank. This process completes the finished product of the reverse-wound spring 101; finally, blanking and collection are carried out;

[0062] Each burner 18 is independently equipped with a flame size adjustment switch 19. The principle of the adjustment switch 19 controlling the flame size of the burner 18 is the same as the principle of adjusting the fire power of a household gas stove, so that the flame of the burner 18 gradually decreases from one end of the guide plate 15 to the other end, which can further improve the annealing quality of the tongue;

[0063] The spring forming device is provided with an arc pressing unit. The tungsten steel rod 6 in the arc pressing unit has high hardness itself, and can continuously and for a long time extrude the flat steel strip, ensuring the stability of the arc pressing process of the flat steel strip. At the same time, an annealing unit is provided, which can continuously heat and anneal the tongue of each reverse winding spring 101, improving the production and manufacturing efficiency of the reverse winding spring 101. In addition, the centralized design of the arc pressing unit, punching unit and annealing unit makes the spring forming device highly integrated and has a small layout area, and can be applied to factories with limited area.

[0064] Refer to Figure 1 - Figure 4 On the other side of the frame 1 at the same horizontal height, a plurality of adjusting wheels 20 are arranged. An annular groove 21 is radially formed in the outer circumference of each adjusting wheel 20, guiding wheel 7 and pressing wheel 2; An adjusting plate 22 is arranged between the pressing wheel 2 and the adjacent guiding wheel 7, and a horizontal groove 23 is formed on the upper surface of the adjusting plate 22; A guiding cover 24 is arranged between the pressing wheel 2 and the base 10;

[0065] A plurality of adjusting wheels 20 are arranged on the frame 1, and the flat steel strip is driven around the adjusting wheels 20. The adjusting wheels 20 can eliminate the internal stress of the flat steel strip, enabling the flat steel strip to smoothly pass through the processing channel, which helps the tungsten steel rod 6 to press and shape the flat steel strip; An annular groove 21 is radially formed in the outer circumference of each adjusting wheel 20, guiding wheel 7 and pressing wheel 2, so that the flat steel strip can move along the specified route without detachment;

[0066] The arranged guiding cover 24 is used to guide the flat steel strip to smoothly enter the gap between the punching block 4 and the base 10. At the same time, it also restrains the flat steel strip, making the flat steel strip enter the gap between the punching block 4 and the base 10 in a horizontal state. If the guiding cover 24 is removed, the flat steel strip will enter the gap between the punching block 4 and the base 10 in a state of upward warping and bending. After the punching block 9 punches the B end, the U-shaped part of the B section may warp and detach from the gap between the punching block 4 and the base 10, and be placed in a warped state between the punching unit and the pressing wheel 2, resulting in the suspension of the production and manufacturing of the reverse winding spring.

[0067] Refer to Figure 7 and Figure 8 and 21 and Figure 22 In the middle position at the lower end of the pressing block 4, a jack 25 is formed, and a tungsten steel rod 6 is inserted into the jack 25. An fixing plate 26 is arranged on the outer side of the lower end of the pressing block 4. The upper end of the fixing plate 26 is bolted to the pressing block 4, and the lower end of the fixing plate 26 presses against the end face of the tungsten steel rod 6;

[0068] The function of the tungsten steel rod 6 is mainly to press down the flat steel strip, generating a downward pressure on the flat steel strip to shape the flat steel strip. During the pressing process, the flat steel strip rubs against the tungsten steel rod 6. Even though the tungsten steel rod 6 has high hardness, it will still have wear and needs to be replaced to prevent the tungsten steel rod 6 from breaking and causing the device to be damaged and stop production. Considering the replacement of the tungsten steel rod 6, a convenient detachable method is set. A jack 25 is provided on the pressing block 4, the tungsten steel rod 6 is inserted into the jack 25, and then it can be fixed by squeezing with the fixing plate 26. It is easy to operate and convenient to replace. And with the replaceable design of the tungsten steel rod 6, reverse winding springs 101 with different arcs can be processed, so that the automatic production of the reverse winding spring 101 can have adjustable and controllable arcs.

[0069] Refer to Figure 1 - Figure 4 and Figure 21 - Figure 22 On the side wall of the pressing block 4 close to the adjusting wheel 20, an oil guide pipe 27 is provided. The end of the oil guide pipe 27 is vertically bent and extends vertically upward, and a sleeve 28 is provided at the end of the oil guide pipe 27. The upper end of the sleeve 28 is closed, and an oil inlet pipe 29 is connected to the outside of the lower end of the sleeve 28. And the end of the oil guide pipe 27 can slide up and down along the inside of the sleeve 28. The bending point of the oil guide pipe 27 is connected to an oil outlet pipe 30, and the oil outlet end of the oil outlet pipe 30 is arranged above between the guide wheel 7 and the adjusting wheel 20;

[0070] In order to reduce the wear of the flat steel strip on the tungsten steel rod 6, extend the service life of the tungsten steel rod 6, and also considering the surface quality of the finished product of the reverse winding spring 101, a structure that can automatically supply oil for lubrication is set. When the pressing block 4 moves down, the upper end of the oil guide pipe 27 moves down to below the oil outlet port of the oil inlet pipe 29. At this time, the outer side wall of the oil guide pipe 27 no longer blocks the oil outlet port of the oil inlet pipe 29, and the lubricating oil in the oil inlet pipe 29 flows into the oil guide pipe 27 and then is discharged along the oil outlet pipe 30. The lubricating oil drips on the upper surface of the flat steel strip, and the lubricating oil covers the upper surface of the flat steel strip, which helps to reduce the wear of the tungsten steel rod 6 and improve the surface quality of the finished product of the reverse winding spring 101 at the same time;

[0071] When the pressing block 4 moves up, the end of the oil guide pipe 27 moves up, and the outer side wall of the oil guide pipe 27 blocks the oil outlet port of the oil inlet pipe 29 again. At this time, no lubricating oil flows out, realizing the intermittent supply of lubricating oil to prevent the continuous outflow of lubricating oil and causing waste.

[0072] Refer to Figure 1 - Figure 4 and Figure 20 On the adjusting plate 22, a scraping plate 31 is provided at a position close to the guide wheel 7. The scraping plate 31 is fixedly connected in the horizontal groove 23 by bolts; below the position on the adjusting plate 22 close to the guide wheel 7, an oil guide plate 32 is provided;

[0073] The adjustment plate 22 and the horizontal groove 23 on its upper surface are used to guide and constrain the flat steel belt so that the flat steel belt can extend in a straight line between the two pressure wheels 2, reducing the possibility of the flat steel belt deviating sideways during movement. A scraper 31 is provided on the adjustment plate 22. The scraper 31 can first exert a downward pressure on the flat steel belt so that the flat steel belt moves in a horizontal state. At the same time, the scraper 31 can scrape the lubricating oil on the surface of the flat steel belt. The scraper 31 can be made of plastic material to prevent the scraper 31 from scratching the surface of the flat steel belt. The scraped lubricating oil drips onto the oil guide plate 32 and is finally collected and recycled.

[0074] Reference Figure 10 - Figure 15 , the punching block 9 includes an upper punch block 33 and a lower punch block 34, the upper punch block 33 and the lower punch block 34 are fixedly connected by a plurality of columns, and the outer ring of each column is provided with a bearing 35; when the plane steel strip is placed in the position of the punching block 9, the plane steel strip is placed between the upper punch block 33 and the lower punch block 34, when punching, the upper punch block 33 and the lower punch block 34 move downward synchronously, and the upper punch block 33 punches the plane steel strip, that is, punches the B segment, after the punching is completed, the upper punch block 33 and the lower punch block 34 move upward synchronously, and the lower punch block 34 pushes up the B segment, so that the U-shaped portion and the spring tongue portion are separated from the groove 11, so as to prevent the edge tip of the U-shaped portion from staying in the groove 11 after the punching is completed, so that the plane steel strip cannot move forward;

[0075] At the same time, the punch block and the lower punch block 34 are fixedly connected by multiple columns, and the outer ring of each column is provided with a bearing 35. The two sides of the flat steel belt can move along the surface of the bearing 35 to prevent the flat steel belt from squeezing the column, causing wear of the column, increase in the clearance on both sides of the flat steel belt, and unstable movement of the flat steel belt.

[0076] Reference Figure 1 - Figure 17 The winding unit further comprises a screw rod 36 rotatably connected to the upper end surface of the U-shaped cover 12, through holes 37 are respectively provided on both sides of the U-shaped cover 12, and execution blocks 38 are symmetrically fixed to the ends of the screw rod 36, one of the execution blocks 38 is fixed to a U-shaped plug plate 39, and the plug plate 39 can reciprocate along the axis of the through hole 37;

[0077] Another execution block 38 is fixed to the receiving winding motor, and the output end of the winding motor is fixed to the receiving winding wheel 13. The winding wheel 13 is also provided with a U-shaped clearance groove 40, and the portion between the horizontal portion of the clearance groove 40 and the slot 14 forms two upper and lower extrusion plates 41, and the upper and lower extrusion plates 41 are respectively connected to the top and bottom surfaces of the clearance groove 40 through springs 42, and the upper surface of the upper extrusion plate 41 and the lower surface of the lower extrusion plate 41 are both provided with wedge blocks 43, and the inserting plate 39 can be inserted between the extrusion plate 41 and the clearance groove 40, and squeezed on the wedge blocks 43;

[0078] Considering the hardness and internal stress of the flat steel strip, if only relying on the slots 14 on the winding wheel 13 to restrain the U-shaped part of the flat steel strip and then winding the flat steel strip, the U-shaped part may fall off the slots 14. Therefore, the insertion plate 39 is provided. The insertion plate 39 can squeeze the U-shaped part against the winding wheel 13. The specific operation is as follows: The U-shaped part extends into the U-shaped cover 12, and then the lead screw 36 is driven to rotate. The lead screw 36 is driven by a forward and reverse motor. When the lead screw 36 rotates forward, the lead screw 36 synchronously drives the two actuator blocks 38 to move relatively closer. One of the actuator blocks 38 drives the insertion plate 39 to extend into the U-shaped cover 12 along the through hole 37. At the same time, the other actuator block 38 drives the winding motor to move, and the winding motor drives the winding wheel 13 to extend into the U-shaped cover 12 along the through hole 37. At this time, the U-shaped part of the flat steel strip is placed between the upper and lower pressing plates 41. At the same time, the insertion plate 39 is inserted into the relief groove 40. The insertion plate 39 squeezes the wedge block 43, and the two pressing plates 41 move closer synchronously and squeeze on the surface of the flat steel strip, that is, squeeze the U-shaped part. After that, the winding motor is driven, and the winding wheel 13 stably winds the flat steel strip.

[0079] Referring to Figure 1 - Figure 19 One end of the material guiding plate 15 is provided with a second cylinder 44. The output end of the second cylinder 44 is fixedly connected with a pushing block 45. The pushing block 45 can push the anti-roll spring 101 that slides from the guiding plate 16 onto the material guiding plate 15 to the other end position of the material guiding plate 15;

[0080] A third cylinder 46 is provided on the side wall at the end of the guiding plate 16. The output end of the third cylinder 46 is fixedly connected with a baffle 51. The baffle 51 can restrain the anti-roll spring 101 that slides from the guiding plate 16 onto the material guiding plate 15 at one side position of the pushing block 45; When the winding of the flat steel strip is completed and the punching is completed, the lead screw 36 rotates reversely, and the two actuator blocks 38 move relatively away. At this time, the blank of the anti-roll spring 101 abuts against the inner side wall of the U-shaped cover 12, is forced to separate from the winding wheel 13, and falls on the guiding plate 16, and then slides along the guiding plate 16 to the position on the material guiding plate 15. When the blank of the anti-roll spring 101 separates from the winding wheel 13, the third cylinder 46 pushes the baffle 51, and the baffle 51 extends onto the material guiding plate 15. At this time, the blank of the anti-roll spring 101 that slides onto the material guiding plate 15 is restrained at one end position of the material guiding plate 15, so that the blank of the anti-roll spring 101 can be kept stable and not toppled. Then the third cylinder 46 drives the baffle 51 to retract and reset. Then the second cylinder 44 pushes the pushing block 45, and the pushing block 45 pushes the anti-roll spring 101 to move to the flame position, so that the spring tongue contacts the flame;

[0081] The cooperation of the second cylinder 44 and the third cylinder 46 enables the blanks of the anti-roll spring 101 to be arranged orderly on the material guiding plate 15, so that the spring tongues of the blanks of the anti-roll spring 101 can be effectively annealed.

[0082] Referring toFigure 1 - Figure 3 , a restraint plate 47 is provided above the material guiding plate 15. The cross-section of the restraint plate 47 is L-shaped. There is a gap between the vertical side plate of the restraint plate 47 and the horizontal side plate of the material guiding plate 15. An inclined edge 48 is provided at the end of the restraint plate 47 close to the push block 45, and the inclined edge 48 is arranged on the vertical side plate of the restraint plate 47;

[0083] A limit plate 50 is further provided above the guiding plate 16. The limit plate 50 is arranged parallel to the guiding plate 16, and the limit plate 50 is used to restrain the tumbling of the reverse winding spring 101, so that when the reverse winding spring 101 slides along the guiding plate 16 to the material guiding plate 15, the tongues of the blank of the reverse winding spring 101 can point to the base 10 uniformly. Thus, when the blank of the reverse winding spring 101 is pushed to the position of the burner 18, the flame can effectively anneal the tongue part. At the same time, an inclined edge 48 is arranged on the restraint plate 47 to guide the tongues of the blank of the reverse winding spring 101, so that the tongues can move along the gap between the vertical side plate of the restraint plate 47 and the horizontal side plate of the material guiding plate 15, further ensuring that the flame can effectively contact the tongue part, and the restraint plate 47 covers the winding part of the reverse winding spring 101, reducing the heating of the flame on the winding part so as not to affect the internal stress of the winding part.

[0084] Refer to Figure 1 - Figure 2 , anti-slip patterns 49 are provided on the surface of each pressing wheel 2; by arranging the anti-slip patterns 49 on the surface of the pressing wheel 2, the extrusion and rubbing effect between the pressing wheel 2 and the flat steel strip is increased, and the possibility of slipping between the flat steel strip and the pressing wheel 2 is reduced.

[0085] Working principle:

[0086] Loading: As shown in Figure 4 , during the loading process of the flat steel strip, first, one end of the flat steel strip is alternately attached to the outer circles of a plurality of adjusting wheels 20 on the right side of the frame body 1 up and down in sequence. Then, one end of the flat steel strip enters from one side of the guiding wheel 7 on the right side and enters the processing channel along the upper side of the guiding wheel 7 on the right side. The flat steel strip penetrates below the tungsten steel rod 6 and extends obliquely upward to the upper side of the guiding wheel 7 on the left side. Then, it extends between the upper and lower pressing wheels 2. The two pressing wheels 2 are driven by a servo motor, and the two pressing wheels 2 are arranged to rotate in opposite directions. As shown in Figure 4 , the upper pressing wheel 2 rotates clockwise, and the lower pressing wheel 2 rotates counterclockwise. By relying on the extrusion of the two pressing wheels 2 on the flat steel strip, the flat steel strip can be rubbed and moved. During the movement, the tungsten steel rod 6 presses an arc on the flat steel strip, the punching block 9 punches and cuts off the flat steel strip of a specified length, and the winding wheel 13 winds the punched and cut flat steel strip;

[0087] Arc pressing: When the flat steel strip moves between the two guide wheels 7, drive the first cylinder 3. The first cylinder 3 drives the pressing block 4 to move downward. At the same time, the tungsten steel rod 6 on the pressing block 4 presses down the flat steel strip between the two guide wheels 7. That is, as the flat steel strip moves, the tungsten steel rod 6 continuously presses down the flat steel strip to press an arc on the flat steel strip, and then it moves to below the punching block 9; the arc pressing travel of the flat steel strip by the tungsten steel rod 6 is the winding length of the finished reverse-wound spring 101. The winding length section is the A section, while the tongue length of the reverse-wound spring 101 is not within the arc pressing travel range, and the tongue length section is the B section. Moreover, the length of the A section can be determined by the number of rotation turns of the two pressure wheels 2. When the length of the A section reaches the specified length, the first cylinder 3 drives the pressing block 4 to move upward, and the tungsten steel rod 6 no longer presses down the flat steel strip. Then the pressure wheels 2 rub the flat steel strip to move a length again, and this length is the tongue length B section of the reverse-wound spring 101. Next, punching is performed;

[0088] Punching: The B section moves above the base 10 and is placed at the notch position of the groove 11. The groove 11 is U-shaped, and the punching block 9 is also designed to fit the shape of the groove 11. Driven by the hydraulic cylinder 8, the punching block 9 punches down the B section, and the B section is punched into the state as shown in Figure 5 shown, the U-shaped part and the tongue part. During the punching process, the winding wheel 13 winds the A section;

[0089] Winding: After punching is completed, the U-shaped part becomes the tail of the A section, and the tongue part becomes the head of the A section. The tail is placed in the slot 14. The winding motor drives the winding wheel 13 to rotate and winds the A section, and the tongue is not wound. This process completes the blank of the reverse-wound spring 101. After that, the blank detaches from the winding wheel 13, and the blank slides obliquely downward along the guide plate 16 onto the guide plate 15, and then annealing treatment is carried out;

[0090] Annealing and blanking: Natural gas can be injected into the furnace body 17, and the flame discharged from the burner 18 heats and anneals the tongue of the blank. This process completes the finished product of the reverse-wound spring 101; finally, blanking and collection are carried out.

[0091] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A spring forming device, characterized in that: It comprises a frame (1), an arc pressing unit is arranged in the middle of the frame (1), two pressing wheels (2) driven by a servo motor are arranged at upper and lower positions on one side of the frame (1), a winding unit is arranged on one side of the winding unit, and an annealing unit is arranged on one side of the winding unit; The arc pressing unit comprises a No. 1 cylinder (3) fixedly connected to the frame (1), a pressing block (4) fixedly connected to the output end of the No. 1 cylinder (3), arc-shaped openings (5) symmetrically provided at two edges of the lower end of the pressing block (4), a tungsten steel rod (6) fixedly provided between the two arc-shaped openings (5), guide wheels (7) provided on the outer sides of the two arc-shaped openings (5), and the two guide wheels (7) and the tungsten steel rod (6) forming a processing channel; The winding unit includes a punching assembly and a winding assembly; The punching assembly comprises a hydraulic cylinder (8), the output end of the hydraulic cylinder (8) is fixedly connected to a punching block (9), a base (10) is provided below the punching block (9), and a groove (11) adapted to the punching block (9) is provided on the base (10); a winding assembly is provided on one side of the base (10), the winding assembly comprises an inverted U-shaped cover (12), a winding wheel (13) is provided inside the U-shaped cover (12), a slot (14) is radially provided on the winding wheel (13), the slot (14) passes through one end of the winding wheel (13), and a winding motor is fixedly connected to the other end of the winding wheel (13); The annealing unit comprises an L-shaped material guide plate (15), a guide plate (16) is provided between one end of the material guide plate (15) and the U-shaped cover (12), a furnace body (17) is provided below the material guide plate (15), a row of burners (18) is provided on the furnace body (17), and the burners (18) are arranged along the length direction of the material guide plate (15).

2. A spring forming device according to claim 1, characterized in that: A plurality of adjusting wheels (20) are arranged at the same level on the other side of the frame (1), and each adjusting wheel (20), guide wheel (7) and pressure wheel (2) has an annular groove (21) radially formed on its outer ring; an adjusting plate (22) is arranged between the pressure wheel (2) and the guide wheel (7) adjacent thereto, and a horizontal groove (23) is arranged on the upper surface of the adjusting plate (22); and a guide cover (24) is arranged between the pressure wheel (2) and the base (10).

3. A spring forming device according to claim 1, characterized in that: The middle position of the lower end of the pressing block (4) is provided with an insertion hole (25), a tungsten steel rod (6) is inserted into the insertion hole (25), a fixing plate (26) is provided on the outer side of the lower end of the pressing block (4), the upper end of the fixing plate (26) is bolted to the pressing block (4), and the lower end of the fixing plate (26) is pressed against the end surface of the tungsten steel rod (6).

4. A spring forming device according to claim 3, characterized in that: An oil guide pipe (27) is provided on a side wall of the pressure block (4) near the regulating wheel (20), the end of the oil guide pipe (27) is vertically bent and vertically extended upward, and a sleeve (28) is provided at the end of the oil guide pipe (27), the upper end of the sleeve (28) is closed, the lower end of the sleeve (28) is connected to an oil inlet pipe (29) outside, and the end of the oil guide pipe (27) can slide up and down along the sleeve (28), the bending point of the oil guide pipe (27) is connected to an oil outlet pipe (30), and the oil outlet end of the oil outlet pipe (30) is arranged above between the guide wheel (7) and the regulating wheel (20).

5. A spring forming device according to claim 2, characterized in that: A scraper (31) is provided on the adjustment plate (22) at a position close to the guide wheel (7), and the scraper (31) is fixed in the horizontal groove (23) by bolts; an oil guide plate (32) is provided below the position close to the guide wheel (7) on the adjustment plate (22).

6. A spring forming device according to claim 1, characterized in that: The punching block (9) comprises an upper punch block (33) and a lower punch block (34); the upper punch block (33) and the lower punch block (34) are fixedly connected via a plurality of columns, and a bearing (35) is provided on the outer ring of each column.

7. A spring forming device according to claim 1, characterized in that: The winding unit further comprises a screw rod (36) rotatably connected to the upper end surface of the U-shaped cover (12), through holes (37) are respectively provided on both sides of the U-shaped cover (12), and execution blocks (38) are symmetrically fixedly connected to the ends of the screw rod (36), wherein one of the execution blocks (38) is fixedly connected to a U-shaped plug plate (39), and the plug plate (39) can reciprocate along the axis of the through hole (37); The other execution block (38) is fixed to the receiving winding motor, and the output end of the winding motor is fixed to the receiving winding wheel (13). The winding wheel (13) is also provided with a U-shaped clearance groove (40). The portion between the horizontal portion of the clearance groove (40) and the slot (14) forms two upper and lower extrusion plates (41). The upper and lower extrusion plates (41) are respectively connected to the top and bottom surfaces of the clearance groove (40) through springs (42), and the upper surface of the upper extrusion plate (41) and the lower surface of the lower extrusion plate (41) are both provided with wedge blocks (43). The insert plate (39) can be inserted between the extrusion plate (41) and the clearance groove (40) and squeezed on the wedge blocks (43).

8. A spring forming device according to claim 1, characterized in that: A No. 2 air cylinder (44) is provided at one end of the guide plate (15), and a push block (45) is fixedly connected to the output end of the No. 2 air cylinder (44). The push block (45) can slide from the guide plate (16) to the rewinding spring (101) on the guide plate (15) and push the guide plate (15) to the other end position; A third cylinder (46) is provided on the end side wall of the guide plate (16), and a baffle (51) is fixedly connected to the output end of the third cylinder (46). The baffle (51) can slide from the guide plate (16) to the rewinding spring (101) on the guide plate (15) to constrain the push block (45) at one side.

9. A spring forming device according to claim 8, characterized in that: A restraining plate (47) is provided above the material guide plate (15). The restraining plate (47) has an L-shaped cross section. A gap is left between the vertical side plate of the restraining plate (47) and the horizontal side plate of the material guide plate (15). An inclined edge (48) is provided at the end of the restraining plate (47) close to the push block (45). The inclined edge (48) is arranged on the vertical side plate of the restraining plate (47).

10. A spring forming device according to claim 2, characterized in that: The surface of each pressing wheel (2) is provided with anti-slip patterns (49).

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