Ejector mechanism of vehicle seat back injection mold

Abstract

The present invention belongs to the field of injection molds, and specifically discloses an ejection mechanism for a vehicle backrest injection mold; the ejection mechanism of the vehicle backrest injection mold includes a bearing plate disposed between a base and a fixed mold, and the bearing plate is fixed on the piston rod of a cylinder; the fixed mold is provided with a plurality of rectangular through holes, which are divided into upper and lower sections. The aperture of the upper-section through hole is larger than that of the lower-section through hole, and a first pulley is rotatably connected to the side wall of the lower-section through hole; a slide rail is laid on the bearing plate corresponding to the through holes; an inclined ejector rod is provided in each through hole, and a sealing plate is hinged to the top end of the ejector rod, and the sealing plate coincides with the upper-section through hole; a slider is hinged to the bottom of the ejector rod, and the slider is slidably connected to the slide rail; a tension spring is fixed between the slider and the bearing plate, and a fixed pulley is fixed to one end of the slider; a first pull wire is fixed to the slider, and the other end of the first pull wire bypasses the fixed pulley and is wound around the first pulley; the purpose of the present invention is to solve the problem that the ejection mechanism occupies space and increases the volume of the mold.

Description

Technical Field

[0001] The invention belongs to the field of injection molds, and specifically discloses an ejection mechanism of a vehicle backrest injection mold. Background Art

[0002] With the rapid development of the plastics industry and the continuous improvement of the strength of general-purpose and engineering plastics, the application scope of plastic products is also expanding, and the consumption of plastic products is also increasing.

[0003] A plastic mold is a tool for producing plastic products. It is composed of several groups of parts and has a molding cavity inside. During injection molding, the mold is clamped on the injection molding machine, and the molten plastic is injected into the molding cavity and cooled and shaped in the cavity. Then the movable mold is separated from the fixed mold, and the product is ejected from the cavity and leaves the fixed mold through the ejection mechanism. Finally, the mold is closed for the next secondary injection molding. The entire injection molding process is carried out in a cycle.

[0004] The design of the mold needs to take into account the accommodation of the ejection mechanism, which invisibly increases the overall volume of the mold and the resources required to process the mold. Summary of the invention

[0005] The invention discloses an ejection mechanism of a vehicle backrest injection mould, aiming to solve the problem that the ejection mechanism occupies space and increases the volume of the mould.

[0006] To solve the above problems, the basic scheme of the present invention is as follows: the ejection mechanism of the vehicle backrest injection mold includes a receiving plate arranged between the base and the fixed mold, and the receiving plate is fixed on the piston rod of the cylinder; a plurality of rectangular through holes are opened on the fixed mold, and the through holes are divided into an upper and a lower section, the aperture of the upper section through hole is larger than the aperture of the lower section through hole, and a first pulley is rotatably connected to the side wall of the lower section through hole; a slide rail is laid on the corresponding through hole on the receiving plate; an inclined ejector rod is arranged in each of the through holes, and a sealing plate for sealing the upper section through hole is hinged to the top end of the ejector rod; the ejector rod is abutted against the first pulley, and a slider is hinged to the bottom of the ejector rod, and the slider is slidably connected to the slide rail; a tension spring is fixed between the slider and the receiving plate, and a fixed pulley is fixed to one end of the slider, and the fixed pulley is located at the inclined end of the ejector rod; a first pull wire is fixed to the slider, and the other end of the first pull wire bypasses the fixed pulley and is wound around the first pulley.

[0007] The basic principle of this scheme is: after the vehicle backrest is cooled and formed, the movable mold is separated from the fixed mold, and the cylinder is started; the piston rod of the cylinder pushes the receiving plate to move upward, and the receiving plate pushes the slider and the ejector rod to move upward.

[0008] During the upward movement of the push rod, the push rod always maintains contact with the first fixed pulley in the inclined state and the vertical state; at this time, the push rod applies a force to the first fixed pulley, the first fixed pulley rotates, and pulls the first pull wire wrapped around the first fixed pulley.

[0009] The first pull wire pulls the slider through the fixed pulley, causing the slider to move right on the slide rail. The movement of the slider drives the bottom end of the push rod to move right, causing the push rod to swing counterclockwise around the first pulley, and the push rod gradually swings to a vertical state. At the same time, the sliding of the slider pulls the tension spring, causing the tension spring to deform.

[0010] As the push rod moves upward, it pushes the sealing plate upward, and the product exerts downward pressure on the sealing plate. Since the sealing plate and the push rod are hingedly connected, the sealing plate swings around the connection point, and the sealing plate always maintains contact with the product and pushes the product to remove it from the chamber.

[0011] After the worker takes out the product, the piston rod of the cylinder drives the receiving plate to move downward; the slider loses the supporting force of the receiving plate, and the slider and the push rod move downward under the action of their own gravity.

[0012] During the downward movement of the push rod, the friction between the push rod and the first pulley causes the first pulley to rotate in the opposite direction, and the first pull line is wound around the first pulley.

[0013] The first pull wire stops applying tension to the slider, the slider stops applying tension to the tension spring, the tension spring begins to restore its deformation, the tension spring pulls the slider to move to the initial position, the slider drives the bottom end of the push rod to move to the left, causing the push rod to swing clockwise around the first pulley until the push rod returns to its initial state.

[0014] After the ejector pin returns to its initial state, the sealing plate overlaps with the top of the through hole again, and the upper surface of the fixed mold is used to press against one end of the sealing plate to force the sealing plate to return to a parallel state. The sealing plate and the through hole fit tightly to seal the through hole.

[0015] Compared with the prior art, the ejector pin in the present invention is tilted, so the space required for the ejection mechanism is reduced, but the effective ejection distance of the ejection mechanism remains unchanged; the space required for the ejection mechanism is reduced, the overall volume of the mold can be reduced, and fewer resources are required for processing; at the same time, the sliding friction between the ejector pin and the through hole is converted into rotational friction, the damage to the ejector pin due to friction is reduced, and the service life of the ejector pin is extended.

[0016] Furthermore, a return spring is fixed between the push rod and the sealing plate.

[0017] By utilizing the reset characteristics of the reset spring, the sealing plate can be quickly swung back to its initial state after being separated from the bonding state with the product; at the same time, the sealing plate is prevented from contacting the through hole when in a vertical state, and the sealing plate is prevented from getting stuck with the through hole, so that the sealing plate cannot close the through hole.

[0018] Further, a second pulley is disposed opposite to the first pulley on the side wall of the lower through hole; guiding sliders are slidably connected to the ejector rods, a second pulling wire is fixed to the guiding sliders, and the other end of the second pulling wire bypasses the first pulley and is wound around the second pulley.

[0019] The guiding sliders are provided to prevent the ejector rods from swinging in the wrong direction; meanwhile, the ejector rods are pulled by the pulling wires to accelerate the swinging speed of the ejector rods.

[0020] Further, rollers are rotatably connected to the lower surface of the slider, the slider is rollingly connected to the slide rail through the rollers, and a tension spring is fixed between the slider and the slide rail.

[0021] The sliding friction between the slider and the receiving plate is changed into rolling friction, the resistance received when the slider moves is reduced, and the slider is prevented from being stuck during the sliding process.

[0022] Further, a buckle end is provided at the lower section of the slider, and the buckle end is snapped onto the slide rail.

[0023] The slider is snapped onto the slide rail. When the receiving plate moves downward, the connection between the slider and the slide rail is maintained, and the slide rail is used to accelerate the downward movement speed of the slider and the ejector rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0025] Figure 2 is Figure 1 a top view of

[0026] Figure 3 is Figure 1 an enlarged schematic diagram of part A in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following is further detailed through specific embodiments:

[0028] The reference numerals in the accompanying drawings of the specification include: fixed mold 1, receiving plate 2, air cylinder 3, slide rail 4, slider 5, ejector rod 6, first pulley 7, second pulley 8, fixed pulley 9, first pulling wire 10, sealing plate 11, return spring 12, guiding slider 13, tension spring 14, through hole 15, second pulling wire 16.

[0029] The embodiment is basically as shown in the attached Figure 1 and Figure 2As shown: The ejection mechanism of the vehicle seat back injection mold includes a receiving plate 2 disposed between the base and the fixed mold 1, and the receiving plate 2 is fixed on the piston rod of the cylinder 3; Four rectangular through holes 15 are provided on the fixed mold 1. The through holes 15 are divided into upper through holes and lower through holes. The aperture of the upper through holes is larger than that of the lower through holes. A first pulley 7 and a second pulley 8 are rotatably connected to the side wall of the lower through hole. The first pulley 7 and the second pulley 8 are arranged opposite to each other; A slide rail 4 is laid on the receiving plate 2 corresponding to the through hole 15.

[0030] As Figure 3 As shown: An ejector rod 6 is obliquely placed in each through hole 15. The top end of the ejector rod 6 is hinged with a sealing plate 11, and the sealing plate 11 seals the upper through hole; A return spring 12 is fixed between the ejector rod 6 and the sealing plate 11. One end of the return spring 12 is fixedly connected to the upper end of the ejector rod 6, and the other end of the return spring is fixed on the lower surface of the sealing plate 11. The ejector rod 6 abuts against the first pulley 7.

[0031] The bottom of the ejector rod 6 is hinged with a slider 5. A roller is rotatably connected to the lower surface of the slider 5. The slider 5 is connected to the slide rail 4 by rolling through the roller. A buckle end is provided at the lower section of the slider 5, and the buckle end is engaged with the slide rail 4. A tension spring 14 is fixed between the slider 5 and the slide rail 4. One end of the tension spring 14 is fixed on the slide rail 4, and the other end of the tension spring 14 is fixed on the slider 5; A fixed pulley 9 is fixed to the right end of the slider 5, and the fixed pulley 9 is located at the right end of the ejector rod 6.

[0032] A first wire 10 is provided between the slider 5 and the first pulley 7. One end of the first wire 10 is fixed on the slider 5, and the other end of the first wire 10 is wound around the first pulley 7 after passing around the fixed pulley 9.

[0033] A guide slider 13 is slidably connected to the ejector rod 6. A second wire 16 is provided between the guide slider 13 and the first pulley 7. One end of the second wire 16 is fixed on the guide slider 13, and the other end of the second wire 16 is wound around the second pulley 8 after passing around the first pulley 7.

[0034] The specific implementation process is as follows: After the vehicle seat back is cooled and formed, the moving mold and the fixed mold 1 are separated, and the cylinder 3 is started; The piston rod of the cylinder 3 pushes the receiving plate 2 upward, and the receiving plate 2 pushes the slide rail 4, the slider 5 and the ejector rod 6 upward.

[0035] During the upward movement of the ejector rod 6, the ejector rod 6 always remains in contact with the first pulley 7 in both the inclined state and the vertical state; At this time, the ejector rod 6 exerts a frictional force on the first pulley 7, and the first pulley 7 rotates and pulls the first wire 10 and the second wire 16 wound around the first pulley 7.

[0036] The first pull wire 10 pulls the slider 5 through the fixed pulley 9, causing the slider 5 to move rightward on the slide rail 4. The slider 5 pulls the tension spring 14, causing the tension spring 14 to deform. At the same time, the movement of the slider 5 drives the bottom end of the push rod 6 to move rightward, causing the push rod 6 to swing counterclockwise around the first pulley 7, causing the push rod 6 to gradually turn into a vertical state.

[0037] The second pull wire 16 drives the guide slider 13 through the second pulley 8, so that the guide slider 13 moves upward relative to the push rod 6, and exerts a leftward pulling force on the upper end of the push rod 6 to prevent the push rod from getting stuck.

[0038] During the upward movement of the push rod 6 , the push rod 6 pushes the sealing plate 11 to move upward, and at this time, the product applies downward pressure to the sealing plate 11 .

[0039] Since the sealing plate 11 and the push rod 6 are hingedly connected, the sealing plate 11 swings around the connection point, and the return spring 12 is deformed at this time. The sealing plate 11 always keeps in contact with the product and pushes the product to make the product leave the chamber.

[0040] After the worker takes out the product, the piston rod of the cylinder 3 drives the receiving plate 2 to move downward, and the receiving plate 2 drives the slide rail 4. Since the slider 5 is buckled on the slide rail 4, the slider 5 and the push rod 6 move downward along with the slide rail 4.

[0041] During the downward movement of the push rod 6, the friction between the push rod 6 and the first pulley 7 causes the first pulley 7 to rotate in the opposite direction, and the first pull wire 10 and the second pull wire 16 wound on the first pulley 7 are loosened.

[0042] The first pull wire 10 stops applying tension to the slider 5, the slider 5 stops applying tension to the tension spring 14, the tension spring 14 starts to restore its deformation, the tension spring 14 pulls the slider 5, causing the slider 5 to move to the left on the slide rail 4, the slider 5 drives the bottom end of the push rod 6 to move to the left, causing the push rod 6 to swing clockwise around the first pulley 7 and tilt until the push rod 6 returns to its initial state.

[0043] The second pull wire 16 stops pulling the guide slider 13 , and the guide slider 13 slides downward relative to the push rod 6 under the action of its own gravity until the guide slider 13 slides to the initial position.

[0044] After the push rod 6 returns to its initial state, and the sealing plate 11 is out of contact with the product, the sealing plate 11 loses the pressure applied by the product, the sealing plate 11 stops applying force to the return spring 12, the return spring 12 begins to restore its deformation, and the sealing plate 11 returns to its initial state under the action of the return spring 12. At this time, the sealing plate 11 coincides with the top end of the through hole 15, and the through hole 15 is sealed.

[0045] The above are only embodiments of the present invention, and well-known general knowledge in the solution is not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope claimed in this application shall be subject to the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. The ejection mechanism of an injection mold for a vehicle backrest, including a receiving plate disposed between the base and the fixed mold, the receiving plate is fixed on the piston rod of the cylinder, and is characterized in that: A plurality of rectangular through holes are formed in the fixed mold. The through holes are divided into upper and lower sections. The aperture of the upper-section through hole is larger than that of the lower-section through hole. A first pulley is rotatably connected to the side wall of the lower-section through hole; slide rails are laid on the receiving plate corresponding to the through holes; inclined ejector rods are arranged in the through holes, and a sealing plate for sealing the upper-section through hole is hinged to the top end of the ejector rod; the ejector rod abuts against the first pulley, and sliders are hinged to the bottom of the ejector rod. The sliders are slidably connected to the slide rails; a tension spring is fixed between the slider and the receiving plate, and a fixed pulley is fixed to one end of the slider. The fixed pulley is located at the inclined end of the ejector rod; a first wire rope is fixed to the slider, and the other end of the first wire rope bypasses the fixed pulley and is wound around the first pulley. A roller is rotatably connected to the lower surface of the slider, and the slider is connected to the slide rail through the roller in a rolling manner. A tension spring is fixed between the slider and the slide rail.

2. The ejection mechanism of the vehicle seat back injection mold according to claim 1, wherein: A second pulley is disposed on the side wall of the lower-section through hole opposite to the first pulley; guiding sliders are slidably connected to the ejector rods, and a second wire rope is fixed to the guiding sliders. The other end of the second wire rope bypasses the first pulley and is wound around the second pulley.

3. The ejection mechanism of the vehicle seat back injection mold according to claim 2, characterized in that: A buckle end is provided at the lower section of the slider, and the buckle end is clamped on the slide rail.

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