Car backrest injection mold

Abstract

The invention belongs to the field of injection molds, and specifically discloses an injection mold for a vehicle backrest; it comprises a movable mold and a fixed mold, the movable mold comprises an upper movable mold and a lower movable mold; a cylinder body of a first cylinder is fixed on the lower movable mold; a first piston rod is fixed on the upper movable mold, and a push rod is provided on the upper movable mold; a second cylinder is arranged above the upper movable mold, a second piston rod is fixed on the upper movable mold, the second piston rod is provided with a first rack, the first rack meshes with a gear, and the gear meshes with a second rack; the upper movable mold is provided with a first through hole and a second through hole connected to each other, the first through hole is provided with a third rack, and a telescopic rod and a spring are provided between the third rack and the second rack; a support rod meshed with the third rack is provided in the second through hole, and a screw is slidably connected to the support rod; the lower movable mold is provided with a threaded hole and a third through hole, and the third through hole is connected with the rodless cavity of the first cylinder through a pipeline; the purpose of the invention is to solve the problem that the product may be stuck on the movable mold, which is not conducive to workers taking out the parts.

Description

Technical Field

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

[0002] Injection molds are widely used in the production of plastic products. They are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. The injection mold consists of two parts: a movable mold and a fixed mold. The movable mold is installed on the movable template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a pouring system and a cavity. The hot-melt plastic is injected into the cavity through the pouring system and cooled to form the desired product. When opening the mold, the movable mold and the fixed mold are separated to remove the plastic product.

[0003] When the product is being formed, due to the high temperature, the overall volume is larger than that at normal temperature. During the cooling process, the temperature changes and the volume of the product shrinks, but the shrinkage is not large. The product may still be stuck on the moving mold. When the moving mold separates from the fixed mold and moves upward, the product may move upward with the moving mold, which is not conducive to workers taking the parts. Summary of the invention

[0004] The invention discloses a vehicle backrest injection mold, which is used to solve the problem that a product may be stuck on a moving mold, making it difficult for workers to take out the product.

[0005] In order to solve the above problems, the basic scheme of the present invention is: a vehicle backrest injection mold, including a movable mold and a fixed mold, the movable mold including an upper movable mold and a lower movable mold; a first cylinder is arranged between the upper movable mold and the lower movable mold, and the cylinder body of the first cylinder is fixed on the lower movable mold; the first piston rod of the first cylinder is fixed on the lower surface of the upper movable mold, and a push rod is fixed on the lower surface of the upper movable mold; a second cylinder fixed on the bracket is arranged above the upper movable mold, and the second piston rod of the second cylinder is fixed on the upper surface of the upper movable mold, and a first rack pointing vertically downward is fixed on the second piston rod, the first rack is meshed with a gear, the gear is rotatably connected to the bracket through a one-way bearing, and the gear is meshed with a horizontally placed second rack; the upper movable mold is opened with axial directions respectively A first through hole in the horizontal direction and a second through hole in the vertical direction, the first through hole is connected with the second through hole, a horizontally placed third rack is provided in the first through hole, the third rack and the second rack are connected by a telescopic rod, and a spring is provided between the third rack and the second rack; a support rod is provided in the second through hole, the upper end of the support rod is provided with teeth meshing with the third rack, sliders are fixed on both sides of the lower end of the support rod, a screw is provided at the lower end of the support rod, a slide groove is opened inside the upper end of the screw, and the slider is slidably connected to the slide groove; the lower moving mold is provided with a third through hole vertically downward and a threaded hole matching the screw; the third through hole is opposite to the chamber on the fixed mold, the push rod is slidably connected in the third through hole, the third through hole is connected with the rodless chamber of the first cylinder through a pipeline, and the push rod is located in the third through hole.

[0006] The basic principle of this solution is as follows: in the initial state, the upper movable mold, the lower movable mold and the fixed mold are tightly fitted to process the product. After the product is cooled and formed, the second cylinder is started, the second cylinder drives the second piston rod to move upward, and the second piston rod drives the upper movable mold to move upward.

[0007] During the upward movement of the upper movable mold, the upper movable mold drives the first piston rod and the push rod to move upward, and the first piston rod drives the first piston plate to move upward; due to the friction between the first piston plate and the cylinder body of the first cylinder, the first piston plate drives the cylinder body of the first cylinder to move upward, so the lower movable mold also moves upward under the drive of the first cylinder.

[0008] When the second piston rod moves upward, the second piston rod drives the gear to rotate counterclockwise, and the counterclockwise rotation of the gear drives the second rack to move rightward, and the second rack drives the third rack to move leftward through the telescopic rod. At this time, the telescopic rod and the spring are stretched at the same time, and the spring is deformed.

[0009] The third rack drives the meshing support rod to rotate. Since the slider fixed on the support rod slides up and down in the slide groove, and the slider and the slide groove are relatively fixed in the circumferential direction, the rotation of the support rod drives the screw rod to rotate; during the rotation of the screw rod, the lower end of the screw rod gradually extends downward to form a threaded hole.

[0010] During the rotation of the screw, the slider slides upward relative to the screw in the slide groove, that is, the support rod and the threaded tube move in the opposite direction, resulting in a gap between the upper movable mold and the lower movable mold. At this time, the ejector rod moves upward for a distance relative to the third through hole, and the ejector rod no longer closes the pipeline.

[0011] The second piston rod of the second cylinder starts to move in the opposite direction, and the second piston rod drives the upper movable mold and the first rack to move downward. Since the gear is rotatably connected to the bracket through a one-way bearing, the limiting force gear can only rotate counterclockwise, and the gear stops rotating at this time.

[0012] The gear stops rotating, and the second rack and the third rack stop moving to the right. At this time, the second rack stops stretching the telescopic rod and the spring, and the spring begins to recover its deformation; the spring applies a downward pulling force to the second rack, so that the second rack remains in meshing with the gear. At the same time, the spring also pulls the telescopic rod to shrink the telescopic rod.

[0013] While the upper movable mold moves downward, the lower movable mold moves downward together with the drive of the first piston rod until the bottom end of the screw contacts the fixed mold. Since the bottom of the screw extends a threaded hole downward, the screw hinders the downward movement of the lower movable mold; while the first piston rod continues to move downward, the first piston rod begins to squeeze the first piston plate downward, and the first piston plate is forced to squeeze the rodless cavity, causing the pressure in the rodless cavity to increase.

[0014] The pressure in the rodless cavity increases, and the gas in the rodless cavity flows from the pipeline to the third through hole under the action of pressure, and finally the gas is blown downward from the third through hole. The gas blows the product downward, separates the product from the lower moving mold, and the product falls onto the fixed mold under the action of gravity.

[0015] The second cylinder drives the second piston rod to move upward again. Based on the same principle, the second piston rod drives the upper movable mold and the lower movable mold to move upward together until the worker takes the product away and closes the second cylinder.

[0016] Compared with the prior art, the present solution utilizes the movement of the upper movable mold and the lower movable mold to generate airflow, which blows the stuck product downward, thereby separating the product from the movable mold in turn; at the same time, the airflow cools the product again in the process of blowing the product, preventing the product from being overheated and scalding the workers who are picking up the product.

[0017] Furthermore, a heat-insulating sealing plate for closing the third through hole is provided at the bottom end of the top rod.

[0018] The heat-insulating sealing plate closes the third through hole to prevent the third through hole from forming edges and corners during product molding, causing an uneven surface of the product; at the same time, the heat-insulating sealing plate isolates the product from the ejector rod to prevent the heat during product molding from being transferred to the ejector rod, causing the ejector rod to be damaged due to excessive heat.

[0019] Furthermore, a buffer pad is provided at the lower end of the screw.

[0020] The buffer pad is used to buffer the impact generated when the lower screw contacts the fixed mold, so as to prevent the screw from hitting the fixed mold with excessive force, thereby causing damage to the fixed mold.

[0021] Further, the upper surface of the cylinder body of the first cylinder is lower in level than the upper surface of the lower movable mold.

[0022] The cylinder body of the first cylinder is prevented from hindering the fitting between the upper movable mold and the lower movable mold, and the cylinder body of the first cylinder is prevented from causing the volume of the mold to increase.

[0023] Furthermore, a limit block is provided in the slide groove at the upper end of the screw rod to prevent the slider from sliding out of the slide groove during the sliding process. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 for Figure 1 Sectional view in the AA direction;

[0026] Figure 3 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0027] Figure 4 for Figure 1 Enlarged schematic diagram of point C in the middle. DETAILED DESCRIPTION

[0028] The following is further described in detail through specific implementation methods:

[0029] The figure marks in the drawings of the specification include: upper movable mold 1, lower movable mold 2, fixed mold 3, first cylinder 4, first piston rod 5, push rod 6, heat insulation sealing plate 7, second cylinder 8, bracket 9, second piston rod 10, first rack 11, gear 12, one-way bearing 13, second rack 14, third rack 15, telescopic rod 16, spring 17, first through hole 18, second through hole 19, support rod 20, threaded hole 21, screw 22, third through hole 23, pipe 24, rodless cavity 25, slider 26, limit block 27.

[0030] The embodiment is basically as shown in the attached Figure 1 and Figure 2 As shown: a vehicle backrest injection mold, including a movable mold and a fixed mold 3, the movable mold includes an upper movable mold 1 and a lower movable mold 2.

[0031] A first cylinder 4 is provided between the upper movable mold 1 and the lower movable mold 2. The cylinder body of the first cylinder 4 is fixed on the lower movable mold 2. The upper surface of the cylinder body of the first cylinder 4 is lower than the upper surface of the lower movable mold 2 in terms of horizontal height. The first piston rod 5 of the first cylinder 4 is welded to the lower surface of the upper movable mold 1. A vertically downward push rod 6 is welded to the lower surface of the upper movable mold 1. A heat insulating sealing plate 7 is welded to the lower surface of the push rod 6.

[0032] A second cylinder 8 is arranged above the upper movable mold 1, and the cylinder body of the second cylinder 8 is welded to the bracket 9. The second piston rod 10 of the second cylinder 8 is welded to the upper surface of the upper movable mold 1. A first rack 11 pointing vertically downward is bonded to the second piston rod 10. The first rack 11 is meshed with a gear 12, and the gear 12 is rotatably connected to the bracket 9. A one-way bearing 13 is arranged between the gear 12 and the bracket 9. The gear 12 can only rotate counterclockwise, and the gear 12 is meshed with a horizontally placed second rack 14.

[0033] The upper movable mold 1 is provided with a first through hole 18 having axial directions in the horizontal direction and a second through hole 19 in the vertical direction. The first through hole 18 is connected to the second through hole 19. A third rack 15 placed horizontally is slidably connected in the first through hole 18. The third rack 15 is connected to the second rack 14 through a telescopic rod 16. A spring 17 is provided between the third rack 15 and the second rack 14. One end of the spring 17 is welded to the second rack 14, and the other end of the spring 17 is welded to the third rack 15.

[0034] A support rod 20 is disposed in the second through hole 19 . The upper end of the support rod 20 is provided with teeth meshing with the third rack 15 . Slide blocks 26 are welded on both sides of the lower end of the support rod 20 . A screw rod 22 is disposed at the lower end of the support rod 20 .

[0035] like Figure 4 As shown: a slide groove is opened inside the upper end of the screw rod 22, a buffer pad is bonded to the lower end of the screw rod 22, a slider 26 is slidably connected to the slide groove, and a limit block 27 is provided in the slide groove to limit the slider 26 from sliding out of the slide groove.

[0036] like Figure 3 As shown: the lower movable mold 2 is provided with a vertically downward threaded hole 21 and a third through hole 23, the screw 22 is threadedly connected to the threaded hole 21; the third through hole 23 is opposite to the chamber on the fixed mold, the push rod 6 is slidably connected in the third through hole 23, the third through hole 23 is connected to the rodless cavity 25 of the first cylinder 4 through a pipe 24, and in the initial state, the lower surface of the sealing plate is parallel to the lower surface of the third through hole 23, and the push rod 6 closes the pipe mouth of the pipe 24.

[0037] The specific implementation process is as follows: in the initial state, the upper movable mold 1 and the lower movable mold 2 are closely fitted with a fixed mold 3 to carry out product processing. After the product is cooled and formed, the second cylinder 8 is started, and the second cylinder 8 drives the second piston rod 10 to move upward, and the second piston rod 10 drives the upper movable mold 1 to move upward.

[0038] During the upward movement of the upper movable mold 1, the upper movable mold 1 drives the first piston rod 5 and the push rod 6 to move upward, and the first piston rod 5 drives the first piston plate to move upward; due to the friction between the first piston plate and the cylinder body of the first cylinder 4, the first piston plate drives the cylinder body of the first cylinder 4 to move upward, so the lower movable mold 2 also moves upward under the drive of the first cylinder 4.

[0039] When the second piston rod 10 moves upward, the second piston rod 10 drives the gear 12 to rotate counterclockwise, and the gear 12 rotates counterclockwise to drive the second rack 14 to move rightward, and the second rack 14 drives the third rack 15 to move leftward through the telescopic rod 16. At this time, the telescopic rod 16 and the spring 17 are stretched at the same time, and the spring 17 is deformed.

[0040] The third rack 15 drives the meshing support rod 20 to rotate. Since the slider 26 fixed on the support rod 20 slides up and down in the slide groove, and the slider 26 and the slide groove are relatively fixed in the circumferential direction, the rotation of the support rod 20 drives the screw rod 22 to rotate; during the rotation of the screw rod 22, the lower end of the screw rod 22 gradually extends downward to form a threaded hole 21.

[0041] During the rotation of the screw 22, the slider 26 slides upward in the slide groove relative to the screw 22, that is, the support rod 20 and the threaded tube move in the opposite direction, resulting in a gap between the upper movable mold 1 and the lower movable mold 2. At this time, the push rod 6 moves upward for a distance relative to the third through hole 23, and the push rod 6 no longer closes the pipe 24.

[0042] The second piston rod 10 of the second cylinder 8 starts to move in the reverse direction, and the second piston rod 10 drives the upper movable mold 1 and the first rack 11 to move downward. Since the gear 12 is rotatably connected to the bracket 9 through the one-way bearing 13, the gear 12 stops rotating at this time.

[0043] The gear 12 stops rotating, and the second rack 14 and the third rack 15 stop moving to the right. At this time, the second rack 14 stops stretching the telescopic rod 16 and the spring 17, and the spring 17 starts to recover its deformation. The spring 17 applies a downward pulling force to the second rack 14, so that the second rack 14 remains in meshing state with the gear 12. At the same time, the spring 17 also pulls the telescopic rod 16 to shrink the telescopic rod 16.

[0044] While the upper movable mold 1 moves downward, the lower movable mold 2 moves downward together with the first piston rod 5 until the bottom end of the screw 22 contacts the fixed mold 3. Since the threaded hole 21 extends downward from the bottom of the screw 22, the screw 22 hinders the downward movement of the lower movable mold 2. The first piston rod 5 continues to move downward, and the first piston rod 5 begins to squeeze the first piston plate downward. The first piston plate is forced to squeeze the rodless cavity 25, causing the pressure in the rodless cavity 25 to increase.

[0045] The pressure in the rodless chamber 25 increases, and the gas in the rodless chamber 25 flows from the pipe 24 to the third through hole 23 under the action of pressure, and finally the gas is blown downward from the third through hole 23. The gas blows the product downward, separates the product from the lower movable mold 2, and the product falls onto the fixed mold 3 under the action of gravity.

[0046] The second cylinder 8 drives the second piston rod 10 to move upward again. Based on the same principle, the second piston rod 10 drives the upper movable mold 1 and the lower movable mold 2 to move upward together until the worker takes away the product and closes the second cylinder 8.

[0047] The above is only an embodiment of the present invention, and the common knowledge in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. The vehicle backrest injection mold includes a movable mold and a fixed mold, characterized in that: The movable mold comprises an upper movable mold and a lower movable mold; a first cylinder is arranged between the upper movable mold and the lower movable mold, and the cylinder body of the first cylinder is fixed on the lower movable mold; a first piston rod of the first cylinder is fixed on the lower surface of the upper movable mold, and a push rod is fixed on the lower surface of the upper movable mold; a second cylinder fixed on a bracket is arranged above the upper movable mold, and a second piston rod of the second cylinder is fixed on the upper surface of the upper movable mold, and a first rack vertically downward is fixed on the second piston rod, and the first rack is meshed with a gear, and the gear is rotatably connected to the bracket through a one-way bearing, and the gear is meshed with a horizontally placed second rack; the upper movable mold is provided with a first through hole with axial directions in the horizontal direction and a second through hole in the vertical direction, and the first through hole is connected with the second through hole, A horizontally placed third rack is provided in the first through hole, the third rack is connected to the second rack by a telescopic rod, and a spring is provided between the third rack and the second rack; a support rod is provided in the second through hole, the upper end of the support rod is provided with teeth meshing with the third rack, sliders are fixed on both sides of the lower end of the support rod, a screw is provided at the lower end of the support rod, a slide groove is provided inside the upper end of the screw, and the slider is slidably connected to the slide groove; the lower movable mold is provided with a third through hole vertically downward and a threaded hole matching the screw; the third through hole is opposite to the chamber on the fixed mold, the push rod is slidably connected in the third through hole, the third through hole is connected to the rodless chamber of the first cylinder through a pipe, and the push rod is located in the third through hole; the upper surface of the cylinder body of the first cylinder is lower than the upper surface of the lower movable mold in terms of horizontal height.

2. The vehicle backrest injection mold according to claim 1, characterized in that: The bottom end of the top rod is provided with a heat-insulating sealing plate for closing the third through hole.

3. The vehicle backrest injection mold according to claim 2, characterized in that: A limiting block is arranged in the slide groove at the upper end of the screw rod.

Images