Hot runner valve needle driving mechanism

Abstract

The utility model discloses a hot runner valve needle driving mechanism, which relates to the technical field of hot runner valve needles and comprises an air cylinder, a mounting bottom plate is fixedly mounted at the bottom of the air cylinder, a protective cover is arranged at the bottom end of the mounting bottom plate, and a valve needle body is fixedly mounted at the output end of the air cylinder. And the other end of the valve needle body extends to the outer surface of the bottom end of the protective cover, a limiting unit is arranged in the protective cover, and buffering units are arranged on the two sides of the interior of the protective cover. The limiting sliding plate is arranged to drive the sliding blocks to slide on the outer surfaces of the limiting vertical rods on the periphery, so that movement of the valve needle body can be limited, position deviation of the valve needle body caused by pushing of the air cylinder is prevented, stable movement of the valve needle body is promoted, and working efficiency is improved; and the resistance of movement of the valve needle is reduced, and the downward movement smoothness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runner valve needles, in particular to a hot runner valve needle driving mechanism. Background Art

[0002] Hot runners are widely used in injection molds. They are mainly used as heating systems to inject melted plastic into the mold cavity. With the rapid development of technology in the hot runner industry, hot runner systems not only have the characteristics of shortening injection cycle, improving product quality and reducing material costs, but also have the advantages of high efficiency, high precision and rapid production, and are favored by mold manufacturers.

[0003] Existing hot runner valve needles mostly use air drive and oil drive when using the driving mechanism, but these two driving methods cannot ensure that the valve needle body can be lifted and lowered smoothly. The impact force during the driving and lifting can easily cause the valve needle to be out of position, thus affecting normal use. Utility Model Content

[0004] The purpose of the present invention is to provide a hot runner valve needle driving mechanism to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The hot runner valve needle drive mechanism includes a cylinder, a mounting base is fixedly installed on the bottom of the cylinder, a protective cover is provided on the bottom end of the mounting base, a valve needle body is fixedly installed on the output end of the cylinder, and the other end of the valve needle body extends on the outer surface of the bottom end of the protective cover.

[0007] A limiting unit is provided inside the protective cover, and buffer units are provided on both sides of the interior of the protective cover.

[0008] A further improvement of the technical solution of the present utility model is that the limiting unit includes limiting vertical rods fixedly installed on the upper and lower ends of the interior of the protective cover and fixedly installed on the four sides of the valve needle body, a limiting slide is fixedly sleeved on the outer surface of the valve needle body, and sliders are fixedly installed on the four sides of the limiting slide, and the sliders are slidably installed on the outer surface of the limiting vertical rods. The limiting vertical rods can limit the valve needle when it moves to prevent displacement.

[0009] A further improvement of the technical solution of the present utility model is that an annular frame is fixedly installed at the bottom notch of the protective cover, clamps are fixedly installed on all four sides of the inner wall of the annular frame, rollers are rotatably installed inside the clamps, and the rollers are fitly connected to the outer surface of the valve needle body. The rollers can promote smooth movement and reduce resistance.

[0010] A further improvement of the technical solution of the present utility model is that the buffer unit includes a bracket fixedly mounted on the top of the protective cover and located on both sides of the cylinder, a piston rod is fixedly mounted on the bottom of the other end of the bracket, the other end of the piston rod passes through the top outer shell of the protective cover and extends inside the protective cover, and the piston rod can limit the brake tooth plate when moving.

[0011] A further improvement of the technical solution of the present invention is that the buffer unit includes a return spring located on the outer surfaces of the left and right limiting vertical rods inside the protective cover, and an extension plate is fixedly installed on the outer surfaces of the left and right sliders of the limiting slide inside the protective cover.

[0012] A further improvement of the technical solution of the present invention is that a rotating gear is rotatably installed inside the extension plate, a braking tooth plate is meshedly connected on the outer side of the rotating gear, and the top of the braking tooth plate is movably sleeved on the outer surface of the bottom end of the piston rod.

[0013] A further improvement of the technical solution of the present utility model is that a fixed vertical rod is movably inserted into the outer side of the bottom of the brake tooth plate, and the fixed vertical rod is fixedly installed at the upper and lower ends on both sides of the interior of the protective cover. A buffer spring is movably sleeved on the outer surface of the fixed vertical rod, and the buffer spring can reduce the impact force of the valve needle moving downward.

[0014] Due to the adoption of the above technical solution, the present invention has achieved the following technical advancements compared to the prior art:

[0015] The utility model provides a hot runner valve needle driving mechanism, which can limit the movement of the valve needle body by arranging a limiting slide to drive the slider to slide on the outer surface of the limiting vertical rods around it, preventing the cylinder from pushing it to cause its position to shift, thereby promoting its movement stability and improving work efficiency.

[0016] The utility model provides a hot runner valve needle driving mechanism. By arranging a roller, the outer surface of the valve needle body will contact the roller when the valve needle moves downward, prompting the roller to rotate, thereby reducing the resistance of the valve needle movement and improving the downward movement smoothness.

[0017] The utility model provides a hot runner valve needle driving mechanism, which drives the sliders on both sides to squeeze the return spring on the outer surface of the limit vertical rod when moving downward by setting a limit slide, thereby preventing the limit slide from colliding with the bottom end of the protective cover, and at the same time can buffer the downward impact force of the valve needle. When the slider moves downward, it will drive the rotating gear to move downward, and the rotating gear will mesh with the brake tooth plate in an interlaced manner. When moving downward, the brake tooth plate will move on the outer surface of the piston rod, and its other end will slide on the outer surface of the fixed vertical rod, and the elastic force of the buffer spring will be used to further improve the buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the protective cover structure of the present utility model;

[0020] Figure 3 This is a schematic cross-sectional view of the protective cover structure of the present utility model;

[0021] Figure 4 For the utility model Figure 3 A is an enlarged structural diagram;

[0022] Figure 5 For the utility model Figure 3 Enlarged structural diagram at point B.

[0023] In the figure: 1. Cylinder; 2. Mounting base plate; 3. Protective cover; 31. Bracket; 32. Piston rod; 33. Limiting vertical rod; 34. Limiting slide plate; 35. Slider; 36. Ring frame; 37. Clamp; 38. Roller; 39. Return spring; 310. Extension plate; 311. Rotating gear; 312. Braking tooth plate; 313. Fixed vertical rod; 314. Buffer spring; 4. Valve needle body. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0025] like Figure 1-5As shown, the utility model provides a hot runner valve needle driving mechanism, including a cylinder 1, a mounting base plate 2 is fixedly installed at the bottom of the cylinder 1, a protective cover 3 is provided on the bottom end of the mounting base plate 2, a valve needle body 4 is fixedly installed on the output end of the cylinder 1, and the other end of the valve needle body 4 extends on the outer surface of the bottom end of the protective cover 3. A limiting unit is provided inside the protective cover 3, and buffer units are provided on both sides of the interior of the protective cover 3. The limiting unit includes a limiting vertical rod 33 fixedly installed on the upper and lower ends of the interior of the protective cover 3 and fixedly installed on the four sides of the valve needle body 4. A limiting slide 34 is fixedly sleeved on the outer surface of the valve needle body 4, and a slider 35 is fixedly installed on the four sides of the limiting slide 34. The slider 35 is slidably installed on the outer surface of the limiting vertical rod 33. An annular frame 36 is fixedly installed at the bottom notch of the protective cover 3, and a clamp 37 is fixedly installed on the four sides of the inner wall of the annular frame 36. A roller 38 is rotatably installed inside the clamp 37, and the roller 38 is fitly connected to the outer surface of the valve needle body 4.

[0026] Furthermore, when the valve needle body 4 moves downward, the limiting slide 34 drives the slider 35 to slide on the outer surface of the limiting vertical rods 33 on all sides, so that the movement of the valve needle body 4 can be limited, the position deviation is prevented, and its movement is promoted to be stable. At the same time, when moving downward, the outer surface of the valve needle body will contact the roller 38 at the bottom. The downward movement of the valve needle prompts the roller 38 to rotate, thereby reducing the resistance of the valve needle movement and improving the smoothness of the downward movement. Example

[0027] like Figure 1-5 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the buffer unit includes a bracket 31 fixedly mounted on the top of the protective cover 3 on both sides of the cylinder 1, and a piston rod 32 is fixedly mounted on the bottom of the other end of the bracket 31, and the other end of the piston rod 32 passes through the top shell of the protective cover 3 and extends inside the protective cover 3. The buffer unit includes a return spring 39 on the outer surfaces of the left and right limiting vertical rods 33 inside the protective cover 3, and the outer surfaces of the left and right sliders 35 on the limiting slide plate 34 inside the protective cover 3 are fixedly mounted, and a rotating gear 311 is rotatably mounted inside the extension plate 310, and a braking tooth plate 312 is meshed and connected on the outer side of the rotating gear 311, and the top of the braking tooth plate 312 is movably sleeved on the outer surface of the bottom end of the piston rod 32, and a fixed vertical rod 313 is movably inserted on the outer side of the bottom of the braking tooth plate 312. The fixed vertical rod 313 is fixedly mounted at the upper and lower ends on both sides of the interior of the protective cover 3, and a buffer spring 314 is movably sleeved on the outer surface of the fixed vertical rod 313.

[0028] Furthermore, the downward movement of the valve needle body 4 will drive the limiting slide 34 to move downward with it. The two sides of the limiting slide 34 drive the sliders 35 to squeeze the return spring 39 on the outer surface of the limiting vertical rod 33 to prevent the limiting slide 34 from colliding with the bottom end of the protective cover. At the same time, it can buffer the downward impact force of the valve needle. When the slider 35 moves downward, it will drive the rotating gear 311 to move downward with it. The rotating gear 311 is meshed with the brake tooth plate 312 and staggered. When moving downward, the brake tooth plate 312 will move on the outer surface of the piston rod 32, and its other end will slide on the outer surface of the fixed vertical rod 313. The elastic force of the buffer spring 314 is used to further improve the buffering effect.

[0029] The following is a detailed description of the working principle of the hot runner valve needle drive mechanism.

[0030] like Figure 1-5 As shown, when in use, the cylinder 1 drives the valve needle body 4 to move downward, and when moving, the limiting slide 34 drives the slider 35 to slide on the outer surface of the limiting vertical rod 33 around it, so that the movement of the valve needle body 4 can be limited to prevent position deviation and promote its stable movement. At the same time, when moving downward, the outer surface of the valve needle body will contact the roller 38 at the bottom, and the downward movement of the valve needle will cause the roller 38 to rotate, thereby reducing the resistance of the valve needle movement and improving the downward smoothness. The downward movement of the valve needle body 4 will drive the limiting slide 34 to move downward, and the two sides of the limiting slide 34 drive The slider 35 squeezes the return spring 39 on the outer surface of the limiting vertical rod 33 to prevent the limiting slide plate 34 from colliding with the bottom end of the protective cover, and at the same time can buffer the downward impact force of the valve needle. When the slider 35 moves downward, it will drive the rotating gear 311 to move downward. The rotating gear 311 is meshed with the brake tooth plate 312, and when moving downward, the brake tooth plate 312 will move on the outer surface of the piston rod 32, and its other end will slide on the outer surface of the fixed vertical rod 313, and the elastic force of the buffer spring 314 will be used to further improve the buffering effect.

[0031] The above generally describes the present invention in detail. However, it is obvious to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A hot runner valve needle drive mechanism, comprising a cylinder (1), characterized in that: A mounting base plate (2) is fixedly mounted on the bottom of the cylinder (1), a protective cover (3) is provided on the bottom end of the mounting base plate (2), a valve needle body (4) is fixedly mounted on the output end of the cylinder (1), and the other end of the valve needle body (4) extends on the outer surface of the bottom end of the protective cover (3); A limiting unit is provided inside the protective cover (3), and buffer units are provided on both sides of the interior of the protective cover (3); The limiting unit comprises a limiting vertical rod (33) fixedly mounted on the upper and lower ends of the interior of the protective cover (3) and fixedly mounted on the four sides of the valve needle body (4); a limiting slide plate (34) is fixedly sleeved on the outer surface of the valve needle body (4); a slider (35) is fixedly mounted on the four sides of the limiting slide plate (34); and the slider (35) is slidably mounted on the outer surface of the limiting vertical rod (33); The buffer unit includes a return spring (39) located on the outer surfaces of the left and right limiting vertical rods (33) inside the protective cover (3), and an extension plate (310) is fixedly installed on the outer surfaces of the left and right sliding blocks (35) of the limiting slide plate (34) inside the protective cover (3).

2. The hot runner valve needle drive mechanism according to claim 1, characterized in that: An annular frame (36) is fixedly mounted at the bottom notch of the protective cover (3), and clamps (37) are fixedly mounted on all four sides of the inner wall of the annular frame (36). A roller (38) is rotatably mounted inside the clamp (37), and the roller (38) is fitted and connected to the outer surface of the valve needle body (4).

3. The hot runner valve needle drive mechanism according to claim 1, characterized in that: The buffer unit comprises a bracket (31) fixedly mounted on the top of the protective cover (3) and located on both sides of the cylinder (1); a piston rod (32) is fixedly mounted on the bottom of the other end of the bracket (31); the other end of the piston rod (32) passes through the top shell of the protective cover (3) and extends inside the protective cover (3).

4. The hot runner valve needle drive mechanism according to claim 1, characterized in that: A rotating gear (311) is rotatably mounted inside the extension plate (310), and a brake tooth plate (312) is meshedly connected on the outer side of the rotating gear (311). The top of the brake tooth plate (312) is movably sleeved on the outer surface of the bottom end of the piston rod (32).

5. The hot runner valve needle drive mechanism according to claim 4, characterized in that: A fixed vertical rod (313) is movably inserted into the outer side of the bottom of the brake tooth plate (312), and the fixed vertical rod (313) is fixedly installed at the upper and lower ends of both sides of the interior of the protective cover (3). A buffer spring (314) is movably sleeved on the outer surface of the fixed vertical rod (313).

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