Ejection and reset mechanism of the injection mold for vehicle backrest

Abstract

The invention belongs to the field of injection molds, and specifically discloses an ejection and reset mechanism of an injection mold for a vehicle backrest; the ejection and reset mechanism comprises a water cooling pipe arranged in a fixed mold, a supercharger is arranged at one end of the water cooling pipe, and a stop valve is arranged at the other end of the water cooling pipe; a plurality of holes vertically downward are arranged on the fixed mold, bellows are arranged in the holes, the bottom of the bellows is sealed and fixed to the water cooling pipe, and the bottom end of the bellows extends into the water cooling pipe; the top end of the bellows is in a sealed state, and a sealing plate is fixedly connected to the top end of the bellows; the purpose of the invention is to solve the problem of space occupation by the ejection and reset mechanism.

Description

Technical Field

[0001] The invention belongs to the field of injection molds, and specifically discloses an ejection and resetting mechanism of a vehicle backrest injection mold. 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] At present, the commonly used mold cooling methods in the injection molding industry are water cooling and oil cooling. Generally, water cooling is used in the injection molding industry, that is, water channels are set up in or around the mold cavity, and the heat is taken away by water cooling circulation, which increases the cooling time, controls the mold temperature, and shortens the molding cycle. However, the fixed mold and the movable mold of the existing injection mold are cooled separately. This cooling method has the problem of uneven cooling, which causes quality problems in the product.

[0004] To solve the above problems, the invention with patent number CN106042310A discloses a high-precision and high-efficiency injection mold, including a fixed mold mounting plate and a fixed mold, the fixed mold is installed above the fixed mold mounting plate, guide columns are arranged around the fixed mold mounting plate, the upper end of the guide column is sleeved with a movable mold mounting plate, a movable mold is installed below the movable mold mounting plate, a casting cavity is formed between the movable mold and the fixed mold, a casting channel connected to the casting cavity is arranged on the movable mold, the movable mold includes a movable mold cavity, the fixed mold includes a fixed mold cavity, the movable mold cavity and the fixed mold cavity together form a casting cavity for casting a calculator housing; a first cooling cavity is arranged on the periphery of the movable mold cavity, a second cooling cavity is arranged outside the fixed mold cavity, and the first cooling cavity and the second cooling cavity are connected to each other.

[0005] However, in the mold of the above invention, it is still necessary to reserve space for the ejection and reset mechanism, which directly leads to an increase in the overall volume of the mold and an increase in the cost of mold processing. Summary of the invention

[0006] The invention discloses an ejection and reset mechanism of an injection mould for a vehicle backrest, aiming to solve the problem that the ejection and reset mechanism occupies space.

[0007] To solve the above problems, the basic scheme of the present invention is: the ejection and reset mechanism of the vehicle backrest injection mold includes a water-cooling pipe arranged in the fixed mold, a supercharger is arranged at one end of the water-cooling pipe, and a stop valve is arranged at the other end of the water-cooling pipe; the fixed mold is provided with a plurality of vertical downward holes, each of which is provided with a bellows, the bottom of the bellows is sealed and fixed to the water-cooling pipe, and the bottom end of the bellows extends into the water-cooling pipe; the top end of the bellows is in a sealed state, and the top end of the bellows is fixedly connected to a sealing plate.

[0008] The basic principle of this scheme is: after the product is cooled and formed in the chamber, the movable mold is separated from the close fitting state with the fixed mold, the stop valve is opened to throttle, the supercharger is started, and the pressure in the water cooling pipe is increased.

[0009] The pressure in the water-cooling pipe increases, and the other end of the water-cooling pipe is closed with a stop valve. Under the action of pressure, the water in the water-cooling pipe flows into the bellows, and the amount of water in the bellows increases, causing the bellows to deform and elongate. The elongation of the bellows drives the tension spring to stretch, and the tension spring accumulates elastic potential energy; the elongation of the bellows pushes the product out of the chamber.

[0010] After the worker removes the product, he closes the booster and the shut-off valve; at this time, the water-cooling pipe is connected to the outside world, the pressure in the water-cooling pipe decreases, and the water in the bellows flows back into the water-cooling pipe under the action of gravity, and the bellows stops stretching; the bellows begins to recover its deformation and shrink until the bellows returns to its initial state.

[0011] When the bellows returns to its initial state, the sealing plate fits the hole and seals the hole.

[0012] After the next product is cooled and formed, repeat the above operation.

[0013] Compared with the prior art, the present invention adopts the extension and contraction of the bellows to realize the ejection and reset functions of the ejection mechanism. There is no need to reserve space for the ejection and reset mechanism between the fixed mold and the base. At the same time, the space occupied by the power mechanism driving the ejector rod on the injection molding machine is reduced, the overall volume of the mold can be reduced, and the processing cost of the mold is also reduced accordingly.

[0014] The water-cooling pipe in the prior art will bypass the ejector rod of the ejection mechanism during the laying process, resulting in the inability to cool the contact part between the product and the ejector rod, uneven cooling of the product, and affecting the quality of the product; while the bellows in the present solution can also play the role of cooling the water-cooling pipe, so that the cooling of the product is more uniform, and the distance between the chamber and the water-cooling pipe is shorter, thereby enhancing the cooling effect.

[0015] A sealing plate is used to seal the holes in the chamber, which provides a stronger seal and avoids the appearance of sharp edges and corners on the surface of the processed product at the sealing plate.

[0016] Furthermore, a tension spring is fixedly arranged between the top end of the inner wall of the bellows and the inner wall of the water cooling pipe.

[0017] By utilizing the tension spring to restore the deformation to speed up the resetting speed of the bellows, the interval time between two product processing can be shortened and the processing efficiency of the product can be improved.

[0018] Furthermore, the bellows is made of alkali-free glass fiber, which is resistant to high temperatures and soft, and prevents the bellows from melting due to high temperatures during injection molding, thereby causing the bellows to be damaged and unable to perform the ejection and reset functions.

[0019] Furthermore, in the initial state, the upper surface of the sealing plate is parallel to the upper surface of the bottom of the fixed mold cavity. The sealing plate is parallel to the bottom of the cavity, ensuring that the surface of the processed product is smoother and avoiding corners on the product surface.

[0020] Furthermore, a waterproof tape is provided at the connection between the bellows and the water cooling pipe to prevent water in the water cooling pipe from entering the hole and flowing into the chamber to affect the processing of the next product. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 for Figure 1 Top view of the . DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods:

[0024] The reference numerals in the drawings of the specification include a fixed mold 1, a water-cooling pipe 2, a bellows 3, a tension spring 4, a sealing plate 5, a stop valve 6, and a supercharger 7.

[0025] The embodiment is basically as shown in the attached Figure 1 and Figure 2 As shown: the ejection and reset mechanism of the vehicle backrest injection mold includes a water cooling pipe 2 arranged in the fixed mold 1, a supercharger 7 with a model number of zxb-01 is arranged at one end of the water cooling pipe 2, and a stop valve 6 with a model number of J41H-16C is arranged at the other end of the water cooling pipe 2.

[0026] Four vertically downward holes are arranged on the fixed mold 1, and bellows 3 are arranged in each of the holes. The bellows 3 adopts a 400℃ resistant (WH00396) hose. The bottom end of the bellows 3 is sealed and fixed to the water-cooling pipe 2, and the bottom end of the bellows 3 extends into the water-cooling pipe 2. A waterproof tape is arranged at the connection between the bellows 3 and the water-cooling pipe 2; a tension spring 4 is fixed between the top of the inner wall of the bellows 3 and the inner wall of the water-cooling pipe 2, one end of the tension spring 4 is fixed to the top of the inner wall of the bellows 3, and the other end of the tension spring is fixed to the inner pipe wall of the water-cooling pipe.

[0027] The top end of the bellows 3 is in a sealed state, and a sealing plate 5 is fixedly connected to the top end of the bellows 3 ; in the initial state, the upper surface of the sealing plate 5 is parallel to the upper surface of the bottom of the cavity of the fixed mold 1 .

[0028] The specific implementation process is as follows: after the movable mold is fitted and fixed to the fixed mold 1, the cavity is injection molded, and water enters the water-cooling pipe of the movable mold through the water-cooling pipe of the movable mold and enters the water-cooling pipe of the fixed mold 1; after the product is cooled and formed in the cavity, the movable mold is separated from the tight fitting state with the fixed mold 1, the stop valve 6 is opened to throttle, and the supercharger 7 is started, and the supercharger 7 increases the pressure in the water-cooling pipe 2.

[0029] The pressure in the water-cooling pipe 2 increases, and the other end of the water-cooling pipe 2 is closed by a stop valve 6. Under the action of pressure, the water in the water-cooling pipe 2 flows into the bellows 3, and the amount of water in the bellows 3 increases, causing the bellows 3 to expand and elongate. The elongation of the bellows 3 drives the tension spring 4 to stretch, and the tension spring 4 accumulates elastic potential energy; the elongation of the bellows 3 pushes the product out of the chamber.

[0030] After the worker takes down the product, he closes the supercharger 7 and the stop valve 6; at this time, the water-cooling pipe 2 is connected to the outside, the pressure in the water-cooling pipe 2 decreases, and the water in the bellows 3 flows back to the water-cooling pipe 2 under the action of gravity, and the bellows 3 stops stretching; the bellows 3 stops applying tension to the tension spring 4, and the tension spring 4 begins to release elastic potential energy to restore deformation. The tension spring 4 pulls the upper end of the bellows 3 to move downward, and the bellows 3 contracts until the bellows 3 returns to its initial state.

[0031] When the bellows 3 returns to its initial state, the sealing plate 5 fits against the hole and seals the hole; during the cooling and forming process, the thrust generated by the water pressure on the bellows 3 is balanced with the tension applied by the tension spring 4 to prevent the sealing plate from floating.

[0032] After the next product is cooled and formed, repeat the above operation.

[0033] 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 ejection and resetting mechanism of the injection mold for the vehicle backrest includes a water cooling pipe arranged in the fixed mold, and is characterized in that: A supercharger is provided at one end of the water-cooling pipe, and a stop valve is provided at the other end of the water-cooling pipe; a plurality of holes are provided on the fixed mold, and bellows are provided in the holes, the bottom of the bellows is fixedly connected to the water-cooling pipe, and the bellows is communicated with the water-cooling pipe; the top of the bellows is in a sealed state, and a sealing plate is fixedly connected to the top of the bellows; a tension spring is fixedly provided between the top of the inner wall of the bellows and the inner wall of the water-cooling pipe, and in the initial state, the upper surface of the sealing plate is parallel to the upper surface of the bottom of the fixed mold chamber; a waterproof tape is provided at the connection between the bellows and the water-cooling pipe.

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