A plastic helical gear demoulding device

Abstract

The present invention discloses a demolding device for a plastic helical gear, belonging to the field of molds. A demolding device for a plastic helical gear includes a moving mold and a fixed mold. A forming cylinder is vertically slidably connected to the upper surface of the moving mold. A support is fixedly connected to the bottom of the forming cylinder. A threaded cylinder is fixedly connected to the middle of the support. A transmission gear is rotatably connected in the moving mold. A mounting rod is elastically rotatably connected to the middle of the threaded rod. A through hole matching with the mounting rod is formed in the middle of the forming table. A cross rod is vertically elastically slidably connected to the middle of the mounting rod. The top of the cross rod intermittently protrudes beyond the upper end surface of the forming table. By setting the forming cylinder, the mounting rod and the cross rod, when the forming cylinder descends, due to the slope of the teeth on the helical gear, the helical gear will also rotate self - rotatably, and the self - rotation direction of the helical gear is the same as that of the threaded rod. Therefore, the torsion force applied by the first torsion spring to the helical gear can assist the helical gear in demolding, avoiding damage to the helical gear due to excessive friction between the helical gear and the forming cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and specifically to a demolding device for plastic helical gears. Background Art

[0002] In production practice, plastic helical gears produced in large quantities are all manufactured by injection molding process. For plastic helical gears, due to the tooth profile of the helical gear having a certain angle of helix, when the plastic part is demolded during injection molding, it is required that while the ejection mechanism ejects in the demolding direction, the cavity of the formed tooth profile or the plastic gear itself rotates in the direction of the tooth profile inclination to achieve the purpose of smooth demolding.

[0003] The existing demolding devices generally only rotate the helical gear itself or the cavity alone to demold the helical gear. This method causes too much frictional force on the tooth part of the helical gear, easily leading to damage to the helical gear. Summary of the Invention

[0004] The purpose of the present invention is to provide a demolding device for plastic helical gears, which has the advantage of rotating the cavity and the helical gear together for demolding, and solves the problem that the helical gear is easily damaged by friction.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A demolding device for plastic helical gears, including a moving mold and a fixed mold. A forming cylinder is vertically slidably connected to the upper surface of the moving mold. A forming table is fixedly connected inside the moving mold. A support is fixedly connected to the bottom of the forming cylinder. A threaded cylinder is fixedly connected to the middle of the support. A transmission gear is rotatably connected inside the moving mold. A threaded rod is fixedly connected to the middle of the transmission gear. The threaded rod is threadedly connected inside the threaded cylinder. An oil cylinder is fixedly connected to the side wall of the moving mold. The output end of the oil cylinder is fixedly connected with a rack meshing with the transmission gear. The middle of the threaded rod is elastically rotatably connected with an installation rod. A through hole matching with the installation rod is opened in the middle of the forming table. A cross rod is vertically elastically slidably connected to the middle of the installation rod. The top of the cross rod intermittently extends beyond the upper end surface of the forming table.

[0006] Preferably, a bearing is fixedly connected to the bottom of the transmission gear and is rotatably connected to the moving mold through the bearing. A rotating rod is fixedly connected to the bottom of the installation rod. The bottom of the rotating rod is rotatably connected to the threaded rod. A first torsion spring is sleeved on the rotating rod. The two ends of the first torsion spring are respectively fixedly connected with the installation rod and the threaded rod.

[0007] Preferably, a connecting rod is fixedly connected to the bottom of the cross rod. A pressing ring is fixedly connected to the end of the connecting rod. A through groove matching with the connecting rod is opened on the side wall of the installation rod. A cylinder is fixedly connected to the middle of the support. A hole matching with the cylinder is opened in the middle of the forming table. The upper part of the cylinder intermittently abuts against the connecting rod.

[0008] Preferably, four piston rods are fixedly connected to the bottom of the bracket, four piston cylinders cooperating with the four piston rods are fixedly connected in the moving mold, a first pipeline is fixedly connected between the four piston cylinders, a pressure box is fixedly connected to the side wall of the moving mold, a second pipeline is fixedly connected between one of the piston cylinders and the pressure box, and a one-way valve is provided on the side wall of the pressure box.

[0009] Preferably, a mounting seat is fixedly connected to the side wall of the moving mold, a mounting cylinder is rotatably connected to the middle of the mounting seat, a nozzle is fixedly connected to the end of the mounting cylinder, a third pipeline is fixedly connected between the nozzle and the pressure box, and a solenoid valve is provided on the third pipeline.

[0010] Preferably, a limiting ring is fixedly connected to the end of the mounting cylinder away from the nozzle, a second torsion spring is sleeved on the mounting cylinder, two ends of the second torsion spring are respectively fixedly connected to the mounting seat and the limiting ring, a mounting ring is rotatably connected to the inner wall of the mounting cylinder, a plug rod is fixedly connected to the side wall of the fixed mold, the plug rod is inserted into the middle of the mounting cylinder and the mounting ring, a sliding block is fixedly connected to the inner wall of the mounting ring, a sliding groove cooperating with the sliding block is formed on the side wall of the plug rod, and the mounting ring is intermittently clamped with the mounting cylinder.

[0011] Preferably, a wedge block is slidably connected to the side wall of the mounting cylinder, the wedge block intermittently abuts against the mounting ring, a conical ring is slidably connected in the mounting seat, the inner wall of the conical ring fits with the wedge block, and the conical ring and the wedge block are magnetically attracted to each other.

[0012] Preferably, a mounting frame is fixedly connected to the side wall of the moving mold, a pull rod is slidably connected to the middle of the mounting frame, the end of the pull rod is fixedly connected to the conical ring, a rectangular plate is fixedly connected to the side wall of the fixed mold, a through hole cooperating with the pull rod is formed on the rectangular plate, a push plate is fixedly connected to the middle of the pull rod, a pull plate is mounted at the end of the pull rod away from the conical ring, and the rectangular plate is located between the push plate and the pull plate.

[0013] Preferably, a plug post is slidably connected to the mounting frame, a jack cooperating with the plug post is formed on the side wall of the pull rod, a tension spring is sleeved on the plug post, two ends of the tension spring are respectively fixedly connected to the mounting frame and the plug post, a first pressure-sensitive switch for controlling the solenoid valve is provided on the side surface of the rectangular plate, and the pull plate intermittently abuts against the first pressure-sensitive switch.

[0014] Preferably, nozzles for spraying mold release agent are fixedly connected to both sides of the moving mold, a dial plate is fixedly connected to the side wall of the limiting ring, a second pressure-sensitive switch for controlling the nozzles is provided on the side wall of the moving mold, and the dial plate intermittently abuts against the second pressure-sensitive switch.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. In the present invention, by providing a forming cylinder, a mounting rod and a cross rod, when the forming cylinder descends, due to the slope of the teeth on the helical gear, the helical gear will also rotate on its own, and the rotation direction of the helical gear is the same as that of the threaded rod. Therefore, the torque applied by the first torsion spring to the helical gear can assist the helical gear in demolding, avoiding damage to the helical gear due to excessive friction between the helical gear and the forming cylinder.

[0017] 2. In the present invention, by making the intermittent clamping connection between the mounting cylinder and the mounting ring, when the mold is opened, first, the second torsion spring stores energy for the swing of the air nozzle, and then the restriction on the mounting cylinder is released, so that the mounting cylinder drives the air nozzle to swing under the action of the second torsion spring to remove plastic chips in a large range. When the mold is not fully closed, relative rotation can occur between the mounting ring and the mounting cylinder. At this time, the second torsion spring will not be twisted, thus avoiding the situation of reverse energy storage for the mounting cylinder.

[0018] 3. After the mounting cylinder drives the air nozzle to swing in the present invention, the limiting ring at the end of the mounting cylinder rotates synchronously. At this time, the dial on the side wall of the limiting ring can contact the second pressure-sensitive switch, so that the second pressure-sensitive switch is squeezed. At this time, the nozzle controlled by the second pressure-sensitive switch sprays a small amount of mold release agent onto the parting surface of the mold, making the demolding of the helical gear easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention Figure 1 ;

[0020] Figure 2 is a schematic diagram of the overall structure of the present invention Figure 2 ;

[0021] Figure 3 is a schematic diagram of the structure at the threaded rod of the present invention;

[0022] Figure 4 is a schematic diagram of the structure at the mounting rod of the present invention;

[0023] Figure 5 is a schematic diagram of the structure at the cross rod of the present invention;

[0024] Figure 6 is a schematic diagram of the structure at the piston cylinder of the present invention;

[0025] Figure 7 is a schematic diagram of the structure at the second torsion spring of the present invention;

[0026] Figure 8 is a schematic diagram of the structure at the mounting ring of the present invention;

[0027] Figure 9 is a schematic diagram of the structure at the plug post of the present invention;

[0028] Figure 10 This is a schematic structural diagram of the rectangular plate of the present invention;

[0029] Figure 11 This is a schematic structural diagram of the nozzle of the present invention.

[0030] In the figure: 1, moving mold; 11, oil cylinder; 12, rack; 13, driving gear; 14, threaded rod; 15, bearing; 16, threaded cylinder; 17, bracket; 18, forming cylinder; 19, forming table; 2, fixed mold; 21, rectangular plate; 22, insertion rod; 23, chute; 24, first pressure-sensitive switch; 3, mounting rod; 31, rotating rod; 32, first torsion spring; 33, cross rod; 34, pressing ring; 35, connecting rod; 36, cylinder; 4, piston cylinder; 41, piston rod; 42, first pipeline; 43, second pipeline; 44, pressure box; 441, one-way valve; 45, third pipeline; 46, solenoid valve; 47, air nozzle; 5, mounting seat; 51, mounting cylinder; 52, limiting ring; 53, second torsion spring; 54, mounting ring; 55, slider; 56, wedge block; 57, conical ring; 6, mounting frame; 61, pull rod; 62, push plate; 63, pull plate; 64, insertion post; 65, tension spring; 7, nozzle; 71, second pressure-sensitive switch; 72, dial plate. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1

[0033] Referring to Figures 1 - 5 , the present invention provides a technical solution: a plastic helical gear demolding device, including a moving mold 1 and a fixed mold 2. The upper surface of the moving mold 1 is vertically slidably connected with a forming cylinder 18. A forming table 19 is fixedly connected inside the moving mold 1. The bottom of the forming cylinder 18 is fixedly connected with a bracket 17. The middle of the bracket 17 is fixedly connected with a threaded cylinder 16. A driving gear 13 is rotatably connected inside the moving mold 1. The middle of the driving gear 13 is fixedly connected with a threaded rod 14. The threaded rod 14 is threadedly connected inside the threaded cylinder 16. An oil cylinder 11 is fixedly connected to the side wall of the moving mold 1. The output end of the oil cylinder 11 is fixedly connected with a rack 12 that meshes with the driving gear 13. The middle of the threaded rod 14 is elastically rotatably connected with a mounting rod 3. A through hole matching the mounting rod 3 is opened in the middle of the forming table 19. The middle of the mounting rod 3 is vertically elastically slidably connected with a cross rod 33. The top of the cross rod 33 intermittently extends beyond the upper end surface of the forming table 19.

[0034] When in use, the fixed mold 2 and the movable mold 1 are installed on the molding machine. After the mold is opened, the oil cylinder 11 is running. At this time, the rack 12 at the output end of the oil cylinder 11 extends out, and then the rack 12 drives the transmission gear 13 to rotate, and then the threaded rod 14 fixedly connected to the transmission gear 13 rotates. At this time, the threaded cylinder 16 threadedly connected to the threaded rod 14 slides axially, and then the axially sliding threaded cylinder 16 drives the molding cylinder 18 to move downward through the bracket 17. At this time, the helical gear in the molding cylinder 18 can rotate and disengage from the molding cylinder 18. Since the bracket 17 slides vertically in the movable mold 1, the molding cylinder 18 will not rotate by itself, and when the threaded rod 14 rotates, it can The mounting rod 3 is driven to rotate synchronously, and the mounting rod 3 in turn drives the cross rod 33 to rotate. The cross rod 33 is inserted into the bottom of the bevel gear, and can drive the bevel gear to rotate, making the bevel gear easier to demould. Since the mounting rod 3 is elastically rotatably connected to the threaded rod 14, the driving force exerted on the mounting rod 3 is non-rigid, thereby ensuring that the bevel gear will not be damaged. The cross rod 33 is elastically slidably connected in the mounting rod 3, and the vertical relative position of the threaded rod 14 and the forming table 19 will not change. Then, when the forming cylinder 18 is completely lowered, the bevel gear is demoulded. At this time, the cross rod 33 is pulled out from the bottom of the bevel gear, and the bevel gear falls off, and the molding is completed.

[0035] The bottom of the transmission tooth 13 is fixedly connected to a bearing 15 and is rotatably connected to the movable mold 1 through the bearing 15. The bottom of the mounting rod 3 is fixedly connected to a rotating rod 31. The bottom of the rotating rod 31 is rotatably connected to the threaded rod 14. A first torsion spring 32 is sleeved on the rotating rod 31. The two ends of the first torsion spring 32 are fixedly connected to the mounting rod 3 and the threaded rod 14 respectively.

[0036] The setting of the rotating rod 31 enables the mounting rod 3 to be connected to the threaded rod 14. The setting of the bearing 15 avoids jamming when the transmission tooth 13 and the movable mold 1 rotate relative to each other. When the transmission tooth 13 rotates, the transmission tooth 13 drives the mounting rod 3 to rotate a certain angle through the first torsion spring 32. Since the rotation angle of the threaded rod 14 is larger than that of the mounting rod 3, the first torsion spring 32 is torsionally twisted and has potential energy. This potential energy is transmitted to the bevel gear through the cross rod 33, so that the bevel gear has a tendency to rotate. When the forming cylinder 18 descends, since the teeth on the bevel gear have an inclination, the bevel gear will also rotate, and the rotation direction of the bevel gear is the same as that of the threaded rod 14. Therefore, the torque applied by the first torsion spring 32 to the bevel gear can assist the bevel gear in demoulding, thereby avoiding excessive friction between the bevel gear and the forming cylinder 18 and damaging the bevel gear.

[0037] A connecting rod 35 is fixedly connected to the bottom of the cross rod 33, a pressure ring 34 is fixedly connected to the end of the connecting rod 35, a through groove cooperating with the connecting rod 35 is provided on the side wall of the mounting rod 3, a cylinder 36 is fixedly connected to the middle of the bracket 17, a hole cooperating with the cylinder 36 is provided in the middle of the forming table 19, and the upper part of the cylinder 36 intermittently abuts against the connecting rod 35.

[0038] The setting of the connecting rod 35 enables the connection between the cross rod 33 and the pressing ring 34. The elastic connection between the cross rod 33 and the mounting rod 3 can be achieved by a spring. The spring is installed at the bottom of the cross rod 33, and both ends of the spring are fixedly connected to the cross rod 33 and the mounting rod 3 respectively. When the bracket 17 is driven to move downward, the cylinder 36 fixedly connected to the bracket 17 moves downward synchronously. After the top of the cylinder 36 contacts the pressing ring 34, the mold opening is still in progress. As the threaded rod 14 continues to rotate, at this time, the cylinder 36 exerts pressure on the pressing ring 34, and then the pressing ring 34 moves downward. At this time, the pressing ring 34 drives the cross rod 33 to move downward, and then the cross rod 33 disengages from the contact with the helical gear. At this time, the helical gear can be disengaged from the mold. Since the cross rod 33 and the mounting rod 3 are elastically connected, when the cylinder 36 moves away from the pressing ring 34, the cross rod 33 can move upward relative to the mounting rod 3, so that the cross rod 33 can catch the helical gear to be formed again.

[0039] Embodiment 2

[0040] Refer to Figure 1 、 Figure 2 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 On the basis of Embodiment 1, further, four piston rods 41 are fixedly connected to the bottom of the bracket 17, and four piston cylinders 4 cooperating with the four piston rods 41 are fixedly connected in the moving mold 1. A first pipe 42 is fixedly connected between the four piston cylinders 4. A pressure box 44 is fixedly connected to the side wall of the moving mold 1. A second pipe 43 is fixedly connected between one of the piston cylinders 4 and the pressure box 44. A one-way valve 441 is provided on the side wall of the pressure box 44.

[0041] When the bracket 17 moves downward, the bracket 17 can drive the piston rod 41 to slide into the piston cylinder 4. At this time, the air in the piston cylinder 4 is transmitted to the pressure box 44 through the first pipe 42 and the second pipe 43, so that the air in the pressure box 44 has high pressure. When the air in the pressure box 44 is discharged, the piston rod 41 slides in the direction away from the piston cylinder 4, and then the external air can enter the pressure box 44 through the one-way valve 441 on the side wall of the pressure box 44 and then enter the piston cylinder 4 through the second pipe 43 and the first pipe 42 to prepare for pressurizing the pressure box 44 next time. By providing four piston cylinders 4, more air can be injected into the pressure box 44, making the pressure in the pressure box 44 greater. The first pipe 42 connects the four piston cylinders 4, so that the air in the four piston cylinders 4 can enter the pressure box 44.

[0042] A mounting seat 5 is fixedly connected to the side wall of the moving mold 1. A mounting cylinder 51 is rotatably connected to the middle of the mounting seat 5. A nozzle 47 is fixedly connected to the end of the mounting cylinder 51. A third pipeline 45 is fixedly connected between the nozzle 47 and the pressure tank 44. An electromagnetic valve 46 is provided on the third pipeline 45.

[0043] After the pressure in the pressure tank 44 increases, by controlling the opening of the electromagnetic valve 46, the air in the pressure tank 44 can be discharged. The air in the pressure tank 44 is ejected successively through the third pipeline 45 and the nozzle 47. Then, when the air is ejected from the nozzle 47, it can blow towards the molding surface of the mold, so as to blow away the plastic particles that may remain on the molding surface, so as not to affect the next molding.

[0044] A limiting ring 52 is fixedly connected to the end of the mounting cylinder 51 away from the nozzle 47. A second torsion spring 53 is sleeved on the mounting cylinder 51. The two ends of the second torsion spring 53 are respectively fixedly connected to the mounting seat 5 and the limiting ring 52. An installation ring 54 is rotatably connected to the inner wall of the mounting cylinder 51. A plug rod 22 is fixedly connected to the side wall of the fixed mold 2. The plug rod 22 is inserted into the middle of the mounting cylinder 51 and the installation ring 54. A slider 55 is fixedly connected to the inner wall of the installation ring 54. A chute 23 matching with the slider 55 is formed on the side wall of the plug rod 22. The installation ring 54 and the mounting cylinder 51 are intermittently clamped.

[0045] When the mold is opened, the plug rod 22 moves away from the mounting cylinder 51. At this time, the installation ring 54 and the mounting cylinder 51 are in a clamped state. Then, the slider 55 on the inner wall of the installation ring 54 can slide in the chute 23 on the side wall of the plug rod 22. The chute 23 is composed of a horizontal section and an arc section. When the slider 55 slides to the arc section of the chute 23, the installation ring 54 can rotate. At this time, the installation ring 54 drives the clamped mounting cylinder 51 to rotate. Then, the limiting ring 52 at the end of the mounting cylinder 51 rotates. At this time, the limiting ring 52 applies a torsion force to the second torsion spring 53, so that the second torsion spring 53 has potential energy. As the mold opening continues, the clamped state between the mounting cylinder 51 and the limiting ring 52 is released. Then, the acting force of the second torsion spring 53 causes the mounting cylinder 51 to swing. At this time, the mounting cylinder 51 drives the nozzle 47 at its end to swing. Then, the swinging nozzle 47 can blow the compressed air to a larger range of the mold parting surface, so that more plastic chips on the parting surface can be blown off.

[0046] A wedge block 56 is slidably connected to the side wall of the mounting cylinder 51. The wedge block 56 intermittently abuts against the installation ring 54. A conical ring 57 is slidably connected in the mounting seat 5. The inner wall of the conical ring 57 fits with the wedge block 56, and the conical ring 57 and the wedge block 56 are magnetically attracted to each other.

[0047] Since the conical ring 57 is in contact with and magnetically attracted to the wedge 56, when the conical ring 57 axially slides on the side wall of the mounting cylinder 51, it can push and pull the wedge 56, causing the wedge 56 to slide towards or away from the mounting ring 54. When the wedge 56 slides towards the mounting ring 54, the mounting ring 54 is locked inside the mounting cylinder 51. When the wedge 56 moves away from the mounting ring 54, the locking between the mounting ring 54 and the mounting cylinder 51 is released. At this time, the mounting ring 54 can rotate relative to the mounting cylinder 51, and the force of the second torsion spring 53 can drive the mounting cylinder 51 to rotate.

[0048] An installation frame 6 is fixedly connected to the side wall of the moving mold 1. A pull rod 61 is slidably connected to the middle of the installation frame 6. The end of the pull rod 61 is fixedly connected to the conical ring 57. A rectangular plate 21 is fixedly connected to the side wall of the fixed mold 2. A through hole matching the pull rod 61 is provided on the rectangular plate 21. A push plate 62 is fixedly connected to the middle of the pull rod 61. A pull plate 63 is installed at one end of the pull rod 61 away from the conical ring 57. The rectangular plate 21 is located between the push plate 62 and the pull plate 63.

[0049] During mold opening, the rectangular plate 21 on the fixed mold 2 moves towards the position of the pull plate 63. When the rectangular plate 21 contacts the pull plate 63, the mold opening is about to reach the end of the stroke. After the rectangular plate 21 contacts the pull plate 63, the pull rod 61 continues to move relative to the rectangular plate 21. At this time, blocked by the rectangular plate 21 against the pull plate 63, the pull rod 61 drives an axial movement between the conical ring 57 and the mounting cylinder 51. Then the conical ring 57 moves away from the wedge 56. And under the magnetic attraction, the wedge 56 slides along the inner wall of the conical ring 57. At this time, the wedge 56 does not contact the mounting ring 54. Then the mounting ring 54 can rotate relative to the mounting cylinder 51. And when the rectangular plate 21 contacts the pull plate 63, the first pressure-sensitive switch 24 on the side wall of the rectangular plate 21 is simultaneously squeezed by the pull plate 63. Then the electromagnetic valve 46 controlled by the first pressure-sensitive switch 24 is opened. At this time, high-pressure air is sprayed through the air nozzle 47 towards the mold parting surface to clean the plastic chips. During mold closing, the rectangular plate 21 pushes the pull rod 61 through the push plate 62. At this time, the pull rod 61 pushes the conical ring 57 towards the wedge 56. At this time, the mounting ring 54 and the mounting cylinder 51 are locked. By making the mounting cylinder 51 and the mounting ring 54 intermittently engage, during mold opening, first, the second torsion spring 53 stores energy for the swing of the air nozzle 47. Then the restriction on the mounting cylinder 51 is released, causing the mounting cylinder 51 to drive the air nozzle 47 to swing under the action of the second torsion spring 53 to remove plastic chips over a large range. And when the mold is not fully closed, the mounting ring 54 and the mounting cylinder 51 can rotate relative to each other. Then the second torsion spring 53 will not be twisted at this time, thus avoiding the situation of reverse energy storage for the mounting cylinder 51.

[0050] A plug post 64 is slidably connected to the mounting bracket 6. A jack cooperating with the plug post 64 is formed on the side wall of the pull rod 61. A tension spring 65 is sleeved on the plug post 64, and the two ends of the tension spring 65 are fixedly connected to the mounting bracket 6 and the plug post 64 respectively. A first pressure-sensitive switch 24 for controlling the solenoid valve 46 is provided on the side surface of the rectangular plate 21, and the pull plate 63 intermittently abuts against the first pressure-sensitive switch 24.

[0051] The plug post 64 is inserted into one end of the pull rod 61 and is provided with a rounded corner. Thus, when the rectangular plate 21 drives the pull rod 61 to slide through the push plate 62 and the pull plate 63, the plug post 64 can easily disengage from the jack on the side wall of the pull rod 61. And when the plug post 64 is inserted into the side wall of the pull rod 61, the relative position between the pull rod 61 and the mounting bracket 6 is not likely to change. In this state, the conical ring 57 presses the wedge block 56 into contact with the mounting ring 54, thereby ensuring the firm clamping between the mounting cylinder 51 and the mounting ring 54.

[0052] Embodiment III

[0053] Referring to Figure 1 、 Figure 2 and Figure 11 On the basis of Embodiment II, further, nozzles 7 for spraying release agent are fixedly connected to both sides of the moving mold 1. A dial plate 72 is fixedly connected to the side wall of the limiting ring 52. A second pressure-sensitive switch 71 for controlling the nozzle 7 is provided on the side wall of the moving mold 1, and the dial plate 72 intermittently abuts against the second pressure-sensitive switch 71.

[0054] After the mounting cylinder 51 drives the air nozzle 47 to swing, the limiting ring 52 at the end of the mounting cylinder 51 rotates synchronously. At this time, the dial plate 72 on the side wall of the limiting ring 52 can contact the second pressure-sensitive switch 71, thereby causing the second pressure-sensitive switch 71 to be squeezed. At this time, the nozzle 7 controlled by the second pressure-sensitive switch 71 sprays a small amount of release agent onto the parting surface of the mold, making the demolding of the helical gear easier.

[0055] Working principle: For this plastic helical gear demolding device, when in use, the fixed mold 2 and the moving mold 1 are installed on the molding machine table. After mold opening, the oil cylinder 11 operates. At this time, the rack 12 at the output end of the oil cylinder 11 extends, and then the rack 12 drives the transmission gear 13 to rotate. Then, the threaded rod 14 fixedly connected to the transmission gear 13 rotates. At this time, the threaded barrel 16 threadedly connected to the threaded rod 14 undergoes axial sliding. Then, the axially sliding threaded barrel 16 drives the molding barrel 18 to move downward through the bracket 17. At this time, the helical gear located in the molding barrel 18 can rotate on its own and separate from the molding barrel 18. Since the bracket 17 slides vertically in the moving mold 1, the molding barrel 18 will not rotate on its own. When the threaded rod 14 rotates, it can drive the mounting rod 3 to rotate synchronously. The mounting rod 3 drives the cross rod 33 to rotate. The cross rod 33 is inserted into the bottom of the helical gear, and then it can drive the helical gear to rotate on its own, making it easier for the helical gear to demold. Since the mounting rod 3 is elastically rotatably connected to the threaded rod 14, the driving force received by the mounting rod 3 is non-rigid, thus ensuring that the helical gear will not be damaged. The cross rod 33 is elastically slidably connected in the mounting rod 3, and the vertical relative position between the threaded rod 14 and the molding table 19 will not change. Then, after the molding barrel 18 completely descends, the helical gear is demolded. At this time, the cross rod 33 is withdrawn from the bottom of the helical gear, and then the helical gear drops, and the molding is completed.

[0056] The setting of the rotating rod 31 enables the connection between the mounting rod 3 and the threaded rod 14. The setting of the bearing 15 prevents jamming when the transmission gear 13 rotates relative to the moving mold 1. When the transmission gear 13 rotates, the transmission gear 13 drives the mounting rod 3 to rotate a certain angle through the first torsion spring 32. Since the rotation angle of the threaded rod 14 is larger than that of the mounting rod 3, the first torsion spring 32 is twisted and has potential energy. This potential energy is transmitted to the helical gear through the cross rod 33, making the helical gear have a tendency to rotate. When the molding barrel 18 descends, due to the slope of the teeth on the helical gear, the helical gear will also rotate on its own, and the rotation direction of the helical gear is the same as that of the threaded rod 14. Then, the torsion force applied by the first torsion spring 32 to the helical gear can assist the helical gear in demolding, preventing the helical gear from being damaged due to excessive friction between the helical gear and the molding barrel 18.

[0057] The setting of the connecting rod 35 enables the connection between the cross rod 33 and the pressing ring 34. The elastic connection between the cross rod 33 and the mounting rod 3 can be achieved through a spring. The spring is installed at the bottom of the cross rod 33, and both ends of the spring are fixedly connected to the cross rod 33 and the mounting rod 3 respectively. When the bracket 17 is driven to move downward, the cylinder 36 fixedly connected to the bracket 17 moves downward synchronously. After the top of the cylinder 36 contacts the pressing ring 34, the mold opening is still in progress. As the threaded rod 14 continues to rotate, at this time, the cylinder 36 exerts pressure on the pressing ring 34, and then the pressing ring 34 moves downward. At this time, the pressing ring 34 drives the cross rod 33 to move downward, and then the cross rod 33 disengages from the contact with the helical gear. At this time, the helical gear can be disengaged from the mold. Due to the elastic connection between the cross rod 33 and the mounting rod 3, when the cylinder 36 moves away from the pressing ring 34, the cross rod 33 can move upward relative to the mounting rod 3, so that the cross rod 33 can catch the helical gear to be formed again.

[0058] When the bracket 17 moves downward, the bracket 17 can drive the piston rod 41 to slide into the piston cylinder 4. At this time, the air in the piston cylinder 4 is transmitted to the pressure box 44 through the first pipeline 42 and the second pipeline 43, so that the air in the pressure box 44 has high pressure. When the air in the pressure box 44 is discharged, the piston rod 41 slides in the direction away from the piston cylinder 4, and then the external air can enter the pressure box 44 through the one-way valve 441 on the side wall of the pressure box 44 and then enter the piston cylinder 4 through the second pipeline 43 and the first pipeline 42 to prepare for the next pressurization of the pressure box 44. By setting four piston cylinders 4, more air can be injected into the pressure box 44, making the pressure in the pressure box 44 greater. The first pipeline 42 connects the four piston cylinders 4, so that the air in the four piston cylinders 4 can enter the pressure box 44.

[0059] After the pressure in the pressure box 44 increases, by controlling the opening of the solenoid valve 46, the air in the pressure box 44 can be discharged. The air in the pressure box 44 is sprayed out through the third pipeline 45 and the air nozzle 47 in sequence. Then, when the air is sprayed out from the air nozzle 47, it can blow towards the molding surface of the mold, so that the plastic particles that may remain on the molding surface can be blown away to avoid affecting the next molding.

[0060] When the mold is opened, the insertion rod 22 moves away from the mounting cylinder 51. At this time, the mounting ring 54 and the mounting cylinder 51 are in a clamped state. Furthermore, the slider 55 on the inner wall of the mounting ring 54 can slide in the chute 23 on the side wall of the insertion rod 22. The chute 23 is composed of a horizontal section and an arc section. When the slider 55 slides to the arc section of the chute 23, the mounting ring 54 can rotate. At this time, the mounting ring 54 drives the clamped mounting cylinder 51 to rotate. Furthermore, the limiting ring 52 at the end of the mounting cylinder 51 rotates. At this time, the limiting ring 52 applies a torsion force to the second torsion spring 53, so that the second torsion spring 53 has potential energy. As the mold opening continues, the clamping state between the mounting cylinder 51 and the limiting ring 52 is released. Furthermore, the acting force of the second torsion spring 53 causes the mounting cylinder 51 to swing. At this time, the mounting cylinder 51 drives the air nozzle 47 at its end to swing. Furthermore, the swinging air nozzle 47 can blow compressed air to a larger range of the mold parting surface, so that more plastic chips on the parting surface can be blown off.

[0061] Since the conical ring 57 and the wedge block 56 are in contact and magnetically attracted to each other, when the conical ring 57 axially slides on the side wall of the mounting cylinder 51, it can push and pull the wedge block 56, so that the wedge block 56 slides towards or away from the mounting ring 54. When the wedge block 56 slides towards the mounting ring 54, the mounting ring 54 is locked in the mounting cylinder 51. When the wedge block 56 moves away from the mounting ring 54, the locking between the mounting ring 54 and the mounting cylinder 51 is released. At this time, the mounting ring 54 can rotate relative to the mounting cylinder 51, so that the acting force of the second torsion spring 53 can drive the mounting cylinder 51 to rotate.

[0062] When the mold is opened, the rectangular plate 21 on the fixed mold 2 moves toward the position of the pulling plate 63. When the rectangular plate 21 contacts the pulling plate 63, the mold opening is about to reach the end of the stroke. After the rectangular plate 21 contacts the pulling plate 63, the pulling rod 61 continues to move relative to the rectangular plate 21. At this time, under the blocking of the pulling plate 63 by the rectangular plate 21, the pulling rod 61 drives the conical ring 57 and the mounting tube 51 to move axially, and then the conical ring 57 moves in the direction away from the wedge block 56, and the wedge block 56 slides along the inner wall of the conical ring 57 under the action of magnetic attraction. At this time, the wedge block 56 does not contact the mounting ring 54, and then the mounting ring 54 can rotate relative to the mounting tube 51, and when the rectangular plate 21 contacts the pulling plate 63, the first pressure-sensitive switch 24 on the side wall of the rectangular plate 21 is squeezed by the pulling plate 63 at the same time, and then controlled by the first pressure-sensitive switch 24. The solenoid valve 46 is opened, and high-pressure air is sprayed toward the mold parting surface through the air nozzle 47 to clean the plastic chips. When the mold is closed, the rectangular plate 21 pushes the pull rod 61 through the push plate 62. At this time, the pull rod 61 pushes the conical ring 57 to move toward the wedge block 56. At this time, the mounting ring 54 and the mounting cylinder 51 are locked. By making the mounting cylinder 51 and the mounting ring 54 intermittently clamped, when the mold is opened, the second torsion spring 53 is used to store energy for the swing of the air nozzle 47, and then the restriction on the mounting cylinder 51 is released, so that the mounting cylinder 51 is driven by the second torsion spring 53 to swing the air nozzle 47 to remove plastic chips on a large scale. When the mold is not fully closed, the mounting ring 54 and the mounting cylinder 51 can rotate relative to each other, and then the second torsion spring 53 will not be twisted at this time, thereby avoiding the reverse accumulation of force on the mounting cylinder 51.

[0063] The plug post 64 is inserted into one end of the pull rod 61 and is provided with a rounded corner. When the rectangular plate 21 drives the pull rod 61 to slide through the push plate 62 and the pull plate 63, the plug post 64 can be easily disengaged from the plug hole on the side wall of the pull rod 61, and when the plug post 64 is inserted into the side wall of the pull rod 61, the relative position of the pull rod 61 and the mounting frame 6 is not easy to change. In this state, the conical ring 57 presses the wedge block 56 into contact with the mounting ring 54, thereby ensuring that the mounting tube 51 and the mounting ring 54 are firmly clamped.

[0064] After the mounting tube 51 drives the air nozzle 47 to swing, the limit ring 52 at the end of the mounting tube 51 rotates synchronously. At this time, the dial plate 72 on the side wall of the limit ring 52 can contact the second pressure-sensitive switch 71, thereby squeezing the second pressure-sensitive switch 71. At this time, the nozzle 7 controlled by the second pressure-sensitive switch 71 sprays a small amount of demoulding agent onto the parting surface of the mold, making it easier to demold the bevel gear.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plastic helical gear demolding device, comprising a moving mold (1) and a fixed mold (2), characterized in that: A forming cylinder (18) is vertically and slidably connected to the upper surface of the moving die (1). A forming table (19) is fixedly connected inside the moving die (1). A bracket (17) is fixedly connected to the bottom of the forming cylinder (18). A threaded cylinder (16) is fixedly connected to the middle of the bracket (17). A transmission gear (13) is rotatably connected inside the moving die (1). A threaded rod (14) is fixedly connected to the middle of the transmission gear (13). The threaded rod (14) is threadedly connected inside the threaded cylinder (16). An oil cylinder (11) is fixedly connected to the side wall of the moving die (1). The output end of the oil cylinder (11) is fixedly connected to a rack (12) that meshes with the transmission gear (13). The middle of the threaded rod (14) is elastically and rotatably connected to an installation rod (3). A through hole matching the installation rod (3) is opened in the middle of the forming table (19). A cross rod (33) is vertically and elastically slidably connected to the middle of the installation rod (3). The top of the cross rod (33) intermittently extends beyond the upper end surface of the forming table (19). A bearing (15) is fixedly connected to the bottom of the transmission gear (13), and the transmission gear (13) is rotatably connected to the moving die (1) through the bearing (15). A rotating rod (31) is fixedly connected to the bottom of the installation rod (3). The bottom of the rotating rod (31) is rotatably connected to the threaded rod (14). A first torsion spring (32) is sleeved on the rotating rod (31). The two ends of the first torsion spring (32) are respectively fixedly connected to the installation rod (3) and the threaded rod (14). A connecting rod (35) is fixedly connected to the bottom of the cross rod (33). A pressing ring (34) is fixedly connected to the end of the connecting rod (35). A through groove matching the connecting rod (35) is opened on the side wall of the installation rod (3). A cylinder (36) is fixedly connected to the middle of the bracket (17). A hole matching the cylinder (36) is opened in the middle of the forming table (19). The upper part of the cylinder (36) intermittently abuts against the connecting rod (35). Four piston rods (41) are fixedly connected to the bottom of the bracket (17). Four piston cylinders (4) matching the four piston rods (41) are fixedly connected inside the moving die (1). A first pipeline (42) is fixedly connected between the four piston cylinders (4). A pressure box (44) is fixedly connected to the side wall of the moving die (1). A second pipeline (43) is fixedly connected between one of the piston cylinders (4) and the pressure box (44). A one-way valve (441) is provided on the side wall of the pressure box (44).

2. The plastic helical gear demolding device according to claim 1, characterized in that: An installation seat (5) is fixedly connected to the side wall of the moving die (1). An installation cylinder (51) is rotatably connected to the middle of the installation seat (5). An air nozzle (47) is fixedly connected to the end of the installation cylinder (51). A third pipeline (45) is fixedly connected between the air nozzle (47) and the pressure box (44). A solenoid valve (46) is provided on the third pipeline (45).

3. The plastic helical gear demolding device according to claim 2, characterized in that: One end of the installation cylinder (51) far from the air nozzle (47) is fixedly connected with a limit ring (52). A second torsion spring (53) is sleeved on the installation cylinder (51). Two ends of the second torsion spring (53) are respectively fixedly connected with the installation seat (5) and the limit ring (52). An installation ring (54) is rotatably connected to the inner wall of the installation cylinder (51). A plug rod (22) is fixedly connected to the side wall of the fixed mold (2). The plug rod (22) is inserted into the middle of the installation cylinder (51) and the installation ring (54). A slider (55) is fixedly connected to the inner wall of the installation ring (54). A chute (23) cooperating with the slider (55) is formed on the side wall of the plug rod (22). The installation ring (54) and the installation cylinder (51) are intermittently clamped.

4. The plastic helical gear demolding device according to claim 3, characterized in that: A wedge block (56) is slidably connected to the side wall of the installation cylinder (51). The wedge block (56) intermittently abuts against the installation ring (54). A conical ring (57) is slidably connected to the installation seat (5). The inner wall of the conical ring (57) fits with the wedge block (56), and the conical ring (57) and the wedge block (56) are magnetically attracted to each other.

5. The plastic helical gear demolding device according to claim 4, characterized in that: An installation frame (6) is fixedly connected to the side wall of the moving mold (1). A pull rod (61) is slidably connected to the middle of the installation frame (6). The end of the pull rod (61) is fixedly connected with the conical ring (57). A rectangular plate (21) is fixedly connected to the side wall of the fixed mold (2). A through hole cooperating with the pull rod (61) is formed on the rectangular plate (21). A push plate (62) is fixedly connected to the middle of the pull rod (61). A pull plate (63) is installed at one end of the pull rod (61) far from the conical ring (57). The rectangular plate (21) is located between the push plate (62) and the pull plate (63).

6. The plastic helical gear demolding device according to claim 5, characterized in that: A plug post (64) is slidably connected to the installation frame (6). A jack cooperating with the plug post (64) is formed on the side wall of the pull rod (61). A tension spring (65) is sleeved on the plug post (64). Two ends of the tension spring (65) are respectively fixedly connected with the installation frame (6) and the plug post (64). A first pressure-sensitive switch (24) for controlling the solenoid valve (46) is arranged on the side surface of the rectangular plate (21). The pull plate (63) intermittently abuts against the first pressure-sensitive switch (24).

7. The plastic helical gear demolding device according to claim 3, characterized in that: Nozzles (7) for spraying mold release agent are fixedly connected to both sides of the moving mold (1). A dial plate (72) is fixedly connected to the side wall of the limit ring (52). A second pressure-sensitive switch (71) for controlling the nozzles (7) is arranged on the side wall of the moving mold (1). The dial plate (72) intermittently abuts against the second pressure-sensitive switch (71).

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