Ejector mechanism for the injection mold of the engine hood

Abstract

The present invention belongs to the field of injection molds, and specifically discloses an ejection mechanism for an injection mold of an engine flip cover; it includes a plurality of horizontally arranged rotating shafts disposed between a fixed mold and a base. The rotating shafts are parallel to each other, and a set of first cams are distributed on the rotating shafts; a second cam is provided between adjacent first cams; air cylinders are provided above the first cams and above the second cams; the cylinder bodies of the air cylinders are all fixed on the lower surface of the fixed mold; the piston rods of the air cylinders all pass downward through the piston plate and the cylinder body, and the piston rods are respectively abutted against the corresponding cams; return springs are provided between the cylinder bodies of the air cylinders and the piston plates, air inlet holes are opened on the piston rods, two obliquely upward air outlet holes are oppositely provided on the piston rods, and a pipe is provided inside the piston rod for communicating the air inlet hole and the air outlet hole; mutually meshing gears are provided at the left ends of the rotating shafts; the present invention discloses an ejection mechanism for an injection mold of an engine flip cover, and its purpose is to solve the adhesion problem between the ejector rod and the product.

Description

Technical Field

[0001] The present invention belongs to the field of injection molds, and specifically discloses an ejection mechanism for an injection mold of an engine flip cover. Background Art

[0002] An injection mold is a type of molding mold widely used in the production of plastic parts products, and is also a tool for endowing plastic products with a complete structure and precise dimensions. Injection molding is a processing method used when mass-producing some parts with complex shapes. An injection mold consists of a moving mold and a fixed mold. The moving mold is installed on the moving template of an injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the moving mold and the fixed mold are closed to form a gating system and a cavity. The molten plastic is injected into the cavity through the gating system, and the required product is formed after cooling. When the mold is opened, the moving mold and the fixed mold are separated to take out the plastic product.

[0003] The ejector rod of the ejection mechanism is located in the cavity. When the product is cooled and formed, adhesion may occur between the ejector rod and the product, and uneven force may occur when manually removing it, resulting in scratches on the surface of the product. Summary of the Invention

[0004] The present invention discloses an ejection mechanism for an injection mold of an engine flip cover, aiming to solve the adhesion problem between the ejector rod and the product.

[0005] To solve the above problems, the basic solution of the present invention is: an ejection mechanism for an injection mold of an engine flip cover, including a plurality of horizontally placed rotating shafts arranged between the fixed mold and the base. The rotating shafts are parallel to each other, and a group of first cams are distributed on the rotating shafts; a second cam is arranged between adjacent first cams, and an included angle is formed between the outer contours of the distal ends of the first cam and the second cam; cylinders are provided above the first cam and the second cam. The cylinders include a first cylinder and a second cylinder. The first cylinder is located directly above the first cam, and the second cylinder is located directly above the second cam; the cylinder bodies of the cylinders are fixed on the lower surface of the fixed mold; the piston rods of the cylinders all pass downward through the piston plate and the cylinder body, and the piston rods are respectively abutted against the corresponding cams; a return spring is fixedly arranged between the upper end of the inner wall of the cylinder body of the cylinder and the piston plate. An air inlet hole is opened in the middle of the piston rod. The air inlet hole is located above the piston plate. Two obliquely upward air outlet holes are arranged directly opposite to the upper ends of the piston rods. A pipeline is arranged inside the piston rod, and the air inlet hole and the air outlet hole are communicated through the pipeline; gears that mesh with each other are arranged at the left ends of the rotating shafts, and the left end of the first rotating shaft is connected to the output shaft of the motor.

[0006] The basic principle of this solution is: after the product in the mold is cooled and formed, the moving mold is separated, and the motor is started.

[0007] The motor drives the first rotating shaft to rotate clockwise through the output shaft. The first rotating shaft drives the rotating shafts to rotate synchronously through meshing gears, and the rotation of the rotating shafts drives the first cam and the second cam to rotate clockwise. Since there is an angle between the outer contour of the distal end of the first cam and the outer contour of the distal end of the second cam, when the first cam and the second cam rotate clockwise simultaneously, the outer contour of the distal end of the first cam first contacts the first piston rod of the first air cylinder.

[0008] When the first piston rod contacts the farthest outer contour of the first cam, the first piston rod is forced to move upward, and the first piston rod ejects the product out of the chamber. The first piston rod drives the first piston plate to move upward, and the first piston plate squeezes the upper half chamber of the air cylinder, increasing the pressure in the upper half chamber. Affected by the pressure, the gas flows in through the intake hole and flows out through the pipeline from the outlet hole. At the same time, the first piston plate squeezes the return spring, and the return spring deforms and compresses.

[0009] When the first piston rod disengages from the outer contour of the distal end of the first cam, the return spring loses the extrusion of the first piston plate, and the return spring begins to recover its deformation and pushes the first piston plate downward. The first piston plate drives the first piston rod to move downward.

[0010] While the first piston rod moves downward, the second piston rod moves upward under the push of the second cam. At this time, the second piston plate squeezes the upper half chamber of the air cylinder, increasing the pressure in the upper half chamber. Affected by the pressure, the gas flows in through the intake hole and flows out through the pipeline from the outlet hole, and the gas flows to the lower surface of the product. At the same time, the second piston plate squeezes the return spring, and the return spring deforms and compresses. When the upper surfaces of the first piston rod and the second piston rod are parallel, the second piston rod pushes the product to continue moving upward. When the second push rod contacts the product, a collision occurs, and the gas flowing out of the outlet hole exerts an obliquely upward pressure on the product to achieve the effect of buffering the impact.

[0011] After the worker removes the product, the second piston rod disengages from the outer contour of the distal end of the second cam, the return spring loses the extrusion of the first piston plate, and the return spring begins to recover its deformation and pushes the second piston plate downward. The second piston plate drives the second piston rod to move downward.

[0012] When the first piston rod and the second piston rod both return to the initial state, the motor is turned off to continue the next injection molding process.

[0013] Compared with the prior art, in this solution, the piston rod is ejected upward in two times, and by using the alternating movement of the two, the ejector rod and the product can be separated with uniform force. And according to the number and position of the piston rods set, a relatively balanced force can be applied to prevent damage to the product.

[0014] When the piston rod in this solution contacts the product, it first contacts with the air flow to form an air flow buffer layer, avoiding the large impact force generated by the too fast movement speed of the piston rod, so as to prevent damage to the product. At the same time, when the air flow contacts the product, it can cool the product again, avoiding scalding when the worker picks up the product due to the too high temperature of the product.

[0015] Furthermore, a plurality of air outlet holes are evenly distributed circumferentially at the upper end of the piston rod.

[0016] The evenly distributed air outlet holes produce a more uniform and wider air flow distribution, with better buffering effect. At the same time, the wider the range of the air flow, the wider the range of cooling the product.

[0017] Furthermore, a buffer pad is evenly arranged at the bottom end of the piston rod.

[0018] The buffer pad is used to reduce the impact when the piston rod moves downward and contacts the cam, reducing the wear between the piston rod and the cam, thereby increasing the service life of the piston rod and the cam.

[0019] Furthermore, the transmission ratios of the gears are all 1:1, realizing synchronous rotation between the rotating shafts, thereby ensuring that the time for the cam to lift the piston rod is consistent, avoiding uneven height of the piston rod and easy tilting and falling of the product.

[0020] Furthermore, the cam is a disk cam. When the disk cam lifts the piston rod, the vibration generated during the process is small, avoiding the product falling due to vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0022] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0023] Figure 3 is Figure 1 a top view of

[0024] Figure 4 is a schematic structural diagram of the rotating shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following is a further detailed description through specific embodiments:

[0026] The reference numerals in the accompanying drawings of the specification include: fixed mold 1, first piston rod 2, second piston rod 3, first piston plate 4, second piston plate 5, rotating shaft 6, first cam 7, second cam 8, gear 9, motor 10, return spring 11, first cylinder 12, second cylinder 13, air inlet hole 14, air outlet hole 15, pipeline 16.

[0027] The embodiment is basically as shown in the attachedFigure 1 , Figure 2 and Figure 3 As shown in Figure 1 , Figure 2 and Figure 3 : The ejection mechanism for the engine hood injection mold includes four horizontally placed rotating shafts 6 arranged between the fixed mold 1 and the base, and the rotating shafts 6 are parallel to each other.

[0028] As Figure 4 shown in Figure 4 : A set of first cams 7 are distributed on the rotating shaft 6; a second cam 8 is arranged between adjacent first cams 7, and the included angle between the connecting lines from the rotation centers of the first cam 7 and the second cam 8 to the farthest ends is sixty degrees.

[0029] As Figure 2 shown in Figure 2 : Cylinders are provided above the first cam 7 and the second cam 8. The cylinders include a first cylinder 12 and a second cylinder 13. The first cylinder 12 is located directly above the first cam 7, and the second cylinder 13 is located directly above the second cam 8; the cylinder bodies of the cylinders are fixed on the lower surface of the fixed mold 1; the piston rods of the cylinders sequentially pass through the piston plate and the cylinder body and extend downward. The piston rods are fixedly connected to the piston plate, and buffer pads are arranged at the bottom ends of the piston rods. The piston rods are respectively abutted against the corresponding cams.

[0030] Reset springs 11 are fixedly arranged between the upper ends of the inner walls of the cylinder bodies of the cylinders and the piston plates. One end of the reset spring 11 is fixed to the upper end of the inner wall of the cylinder body, and the other end of the reset spring 11 is fixed to the upper surface of the piston plate. Air inlet holes 14 are opened in the middle of the piston rods. The air inlet holes 14 are located above the piston plate. Obliquely upward air outlet holes 15 are arranged on the piston rods. The air outlet holes 15 are evenly distributed circumferentially at the upper ends of the piston rods; pipes 16 are arranged in the piston rods, and the air inlet holes 14 and the air outlet holes 15 are communicated through the pipes 16; mutually meshing gears 9 are arranged at the left ends of the rotating shafts 6, and the left end of the first rotating shaft 6 is connected to the output shaft of the motor 10.

[0031] In the initial state, the piston rods are respectively abutted against the proximal outer contours of the cams. At this time, the upper surfaces of the piston rods are parallel to the upper surface of the bottom of the cavity of the fixed mold 1.

[0032] The specific implementation process is as follows: After the product in the mold is cooled and formed, the moving mold is separated, and the motor 10 is started.

[0033] The motor 10 drives the first rotating shaft 6 to rotate clockwise through the output shaft. The first rotating shaft 6 drives the rotating shafts 6 to rotate synchronously through the meshing gears 9. The rotation of the rotating shafts 6 drives the first cam 7 and the second cam 8 to rotate clockwise; since the included angle between the distal outer contours of the first cam 7 and the second cam 8 is sixty degrees, when the first cam 7 and the second cam 8 rotate clockwise simultaneously, the distal outer contour of the first cam 7 first contacts the first piston rod 2 of the first cylinder 12.

[0034] When the first piston rod 2 contacts the outermost contour of the first cam 7, the first piston rod 2 is forced to move upward, and the first piston rod 2 ejects the product out of the chamber; the first piston rod 2 drives the first piston plate 4 to move upward, the first piston plate 4 squeezes the upper half chamber of the cylinder, the pressure in the upper half chamber increases, and the gas flows in from the air inlet hole 14 under the influence of the pressure and flows out from the air outlet hole 15 through the pipeline 16; at the same time, the first piston plate 4 squeezes the return spring 11, and the return spring 11 deforms and compresses.

[0035] When the first piston rod 2 disengages from the contact with the distal outer contour of the first cam 7, the return spring 11 loses the extrusion of the first piston plate 4, the return spring 11 begins to recover its deformation and pushes the first piston plate 4 to move downward, and the first piston plate 4 drives the first piston rod 2 to move downward.

[0036] While the first piston rod 2 moves downward, the second piston rod 3 moves upward under the push of the second cam 8; at this time, the second piston plate 5 squeezes the upper half chamber of the cylinder, the pressure in the upper half chamber increases, the gas flows in from the air inlet hole 14 under the influence of the pressure and flows out from the air outlet hole 15 through the pipeline 16, and the gas flows to the lower surface of the product; at the same time, the second piston plate 5 squeezes the return spring 11, and the return spring 11 deforms and compresses; when the upper surfaces of the first piston rod 2 and the second piston rod 3 are parallel, the second piston rod 3 pushes the product to continue moving upward, and a collision occurs when the second push rod contacts the product; the gas flowing out from the air outlet hole 15 exerts an obliquely upward pressure on the product to buffer the impact, and at the same time, the gas flow cools the product.

[0037] After the worker removes the product, the second piston rod 3 disengages from the contact with the distal outer contour of the second cam 8, the return spring 11 loses the extrusion of the first piston plate 4, the return spring 11 begins to recover its deformation and pushes the second piston plate 5 to move downward, and the second piston plate 5 drives the second piston rod 3 to move downward.

[0038] Until the first piston rod 2 and the second piston rod 3 both return to the initial state, the motor 10 is turned off and the next injection molding process is continued.

[0039] The above are only the embodiments of the present invention, and common general knowledge in the solution is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can still be made, and these 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 practicability of the patent. The protection scope required by this application should 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. Ejector mechanism for the injection mold of the engine flip cover, characterized in that: It includes a number of horizontally placed rotating shafts arranged between the fixed mold and the base. The rotating shafts are parallel to each other, and a set of first cams are distributed on the rotating shafts. A second cam is arranged between adjacent first cams. An included angle is formed between the outer contours of the distal ends of the first cam and the second cam. Cylinders are provided above the first cam and the second cam. The cylinders include a first cylinder and a second cylinder. The first cylinder is directly above the first cam, and the second cylinder is directly above the second cam. The cylinder bodies of the cylinders are fixed on the lower surface of the fixed mold. The piston rods of the cylinders all pass downward through the piston plate and the cylinder body. The piston rods are fixedly connected to the piston plate and are respectively abutted against the corresponding cams. A return spring is fixedly arranged between the upper end of the inner wall of the cylinder body of the cylinder and the piston plate. An air inlet hole is opened in the middle of each piston rod. The air inlet hole is located above the piston plate. Two obliquely upward air outlet holes are oppositely arranged at the upper ends of the piston rods. A pipeline is arranged inside the piston rod. The air inlet hole and the air outlet hole are communicated through the pipeline. A gear that meshes with each other is provided at the left end of each rotating shaft. The left end of the first rotating shaft is connected to the output shaft of the motor. A buffer pad is arranged at the bottom end of each piston rod.

2. The ejection mechanism for the injection mold of the engine flip cover according to claim 1, wherein: The transmission ratio of the gears is all one to one.

3. The ejection mechanism for the injection mold of the engine flip cover according to claim 2, characterized in that: The cam is a disk cam.

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