Injection Mold for Motorcycle Front Fender

Abstract

The present invention belongs to the field of injection molds, and specifically discloses an injection mold for a motorcycle front fender. An upper cooling pipeline is provided in the upper mold, and a lower cooling pipeline is provided in the lower mold. One end of the upper cooling pipeline is communicated with the lower cooling pipeline, and the other end of the upper cooling pipeline is communicated with the discharge end of the feeding mechanism. One end of the lower cooling pipeline is communicated with a discharge pipe, and one end of the discharge pipe is communicated with a liquid suction pump. Ball bearings are placed in both the upper cooling pipeline and the lower cooling pipeline. The ball bearings are made of hard plastic, the ball bearings are hollow, liquid inlet holes are provided on the ball bearings, and plugs are hermetically clamped on the liquid inlet holes. The plugs are made of magnets, positioning blocks are provided on the ball bearings, and the positioning blocks are made of magnets. A first electromagnet for adsorbing the positioning blocks and a second electromagnet for adsorbing the plugs are provided on the lower mold, and the first electromagnet and the second electromagnet are respectively located on the upper and lower sides of the lower cooling pipeline. This device solves the problem in the prior art that the lower mold and the upper mold are cooled separately, resulting in uneven cooling.

Description

Technical Field

[0001] The present invention belongs to the field of injection molds, and particularly relates to an injection mold for a motorcycle front fender. Background Art

[0002] The injection mold for a motorcycle front fender mainly consists of an upper mold and a lower mold. Cooling systems are provided on both the upper mold and the lower mold. During the injection process, plastic pellets are heated and melted and then injected into the mold. After condensation, the mold is opened and the formed product is ejected. During continuous production, the mold needs to be cooled to shorten the plastic condensation time, improve the product dimensional accuracy, forming quality and surface quality. The cooling rate affects the molecular distribution orientation and crystallinity inside. Uniform cooling can produce uniform shrinkage. However, due to geometric asymmetry, different heat concentration areas are easily formed inside and outside the product. The inside of the product is the slowest to cool, resulting in uneven shrinkage, a large shrinkage rate, and bending of the finished product. Therefore, the mold must be cooled evenly and effectively to ensure the temperature balance of the mold. The size and forming of plastic products often determine the quality of injection molded products, so the cooling method is particularly important.

[0003] Currently, the common mold cooling methods in the injection industry are mainly water cooling and oil cooling. Generally, water cooling is usually adopted in the injection industry, that is, water channels are arranged in or around the mold cavity, and the heat is taken away by the water cooling cycle to increase the cooling time, control the mold temperature, and shorten the forming cycle.

[0004] However, the lower mold and the upper mold of the existing injection molds are cooled separately, and this cooling method has the problem of uneven cooling, which causes quality problems in the products. Summary of the Invention

[0005] The purpose of the present invention is to provide an injection mold for a motorcycle front fender to solve the problem of uneven cooling caused by the separate cooling of the lower mold and the upper mold in the prior art.

[0006] To achieve the above object, the basic solution of the present invention provides an injection mold for a motorcycle front fender, including a feeding mechanism, an upper mold and a lower mold. The feeding mechanism has a discharge end. An upper cooling pipe is provided in the upper mold, and a lower cooling pipe is provided in the lower mold. One end of the upper cooling pipe is communicated with the lower cooling pipe, and the other end of the upper cooling pipe is communicated with the discharge end of the feeding mechanism. One end of the lower cooling pipe far from the connection with the upper cooling pipe is communicated with a discharge pipe, and the end of the discharge pipe far from the upper cooling pipe is communicated with a liquid suction pump. A number of balls that can roll in the upper cooling pipe and the lower cooling pipe are placed in both the upper cooling pipe and the lower cooling pipe. The balls are made of hard plastic, the balls are hollow, liquid inlet holes are provided on the balls, and plugs are hermetically clamped into the liquid inlet holes. The plugs are made of magnets. Positioning blocks are provided on the balls. The positioning blocks are made of magnets. The positioning blocks and the plugs are symmetrically arranged with respect to the diameter of the balls. The opposite sides of the positioning blocks and the plugs have opposite polarities. A first electromagnet for adsorbing the positioning blocks and a second electromagnet for adsorbing the plugs are provided on the lower mold. The first electromagnet and the second electromagnet are respectively located on the upper and lower sides of the lower cooling pipe.

[0007] The principle of this basic solution is as follows: After injection, a coolant with balls is added to the feeding mechanism. The coolant with balls enters the upper cooling pipe under the action of the feeding mechanism, and the coolant flows into the lower cooling pipe. At this time, the liquid suction pump is started to discharge the coolant from the lower cooling pipe, and at the same time, the coolant with balls is added to the feeding mechanism. The coolant continuously flows in the upper cooling pipe and the lower cooling pipe to cool the product in the cavity. The balls roll in the upper cooling pipe and the lower cooling pipe under the drive of the coolant. When the product is cooled and formed, before removing the upper mold, stop adding the coolant to the screw conveyor of the feeding mechanism and stop the liquid suction pump. Make the first electromagnet and the second electromagnet magnetically conductive, so that the first electromagnet adsorbs the positioning block, and then the ball rotates and is fixed on the inner wall of the lower cooling pipe with the plug facing downward. At the same time, make the second electromagnet generate a suction force on the plug, so that the plug is separated from the ball and the liquid inlet hole leaks. At this time, the coolant enters the ball, so that a gap is generated in the lower cooling pipe, and then the coolant in the upper cooling pipe flows into the lower pipe chamber, that is, the coolant in the upper cooling pipe all flows into the lower cooling pipe. At this time, make the third electromagnet magnetically conductive, adsorb and fix the positioning block on the ball in the upper cooling pipe. At this time, open the mold. Since there is no coolant in the upper cooling pipe, the mold will not be contaminated. At the same time, due to the presence of balls in the upper cooling pipe and the lower cooling pipe, the gap for accommodating the coolant is small. Therefore, less coolant needs to be added when closing the mold again, but it can quickly fill the upper cooling pipe and the lower cooling pipe, and at the same time ensure that the coolant can keep full contact with the pipe walls of the upper cooling pipe and the lower cooling pipe, that is, maintain a sufficiently large heat dissipation area, thus ensuring the heat dissipation effect.

[0008] The beneficial effects of this basic solution are as follows: 1. In this device, the mold is cooled through the circulation of the balls and the coolant. When it is necessary to separate the upper mold and the lower mold, the positioning block on the ball is adsorbed by the first electromagnet, causing the ball to rotate and align the plug block with the second electromagnet. At this time, the second electromagnet is magnetized to suck out the plug block. The coolant enters the cavity in the ball, causing the liquid level in the cooling channel of the lower mold to drop, and the coolant of the upper mold enters the lower mold. As a result, there is no coolant in the coolant channel of the upper mold, and thus the coolant will not flow from the upper mold to the lower mold when separating the upper mold and the lower mold, avoiding the pollution of the mold by the coolant.

[0009] 2. The cooling channels in the upper mold of this device are connected to the cooling channels in the lower mold, enabling uniform cooling of the upper mold and the lower mold during the cooling process.

[0010] Optimization solution one: A bead collecting box is connected to the upper part of the discharge pipe, and a filter screen is installed on the discharge pipe. The filter screen is located between the bead collecting box and the liquid suction pump. The bead collecting box is provided to facilitate the collection of the balls discharged along with the coolant for reuse.

[0011] Optimization solution two: An iron-made magnetic isolation plate is fixedly connected inside the ball. The magnetic isolation plate is located between the positioning block and the plug. The magnetic isolation plate is provided to prevent the magnetic induction lines of the first electromagnet and the second electromagnet from intersecting when the first electromagnet and the second electromagnet are magnetized, affecting the separation of the plug block from the ball.

[0012] Optimization solution three: A fourth electromagnet is fixedly connected to the bottom of the bead collecting box. The fourth electromagnet is provided to make the magnet on the ball receive a suction force, so that the ball can sink into the bead collecting box, preventing the ball from being sucked by the liquid suction pump and accumulating on the filter screen.

[0013] Optimization solution four: The feeding mechanism is a spiral conveying mechanism. The spiral conveying mechanism is provided to enable the balls to enter the upper cooling pipeline in an orderly manner, preventing the balls from being blocked when entering the upper cooling pipeline. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the injection mold for the front fender of a motorcycle in an embodiment of the present invention;

[0015] Figure 2 It is a schematic structural diagram of the ball in this embodiment. Detailed Description of the Invention

[0016] The present invention will be further described in detail below through specific embodiments:

[0017] The reference numerals in the attached drawings of the specification include: lower die 1, upper die 2, third electromagnet 3, upper cooling pipeline 4, first electromagnet 5, lower cooling pipeline 6, second electromagnet 7, bead collecting box 8, spiral conveying mechanism 9, liquid suction pump 10, ball 11, positioning block 12, magnetic isolation plate 13, plug 14.

[0018] Embodiment: The injection mold for the front fender of a motorcycle in this solution, as Figure 1 and Figure 2 shown, includes a spiral conveying mechanism 9, an upper die 2 and a lower die 1. The spiral conveying mechanism 9 has a discharge end. The spiral conveying mechanism 9 includes a driving motor and a cylindrical outer shell. A shaft spiral blade is rotatably connected inside the outer shell, and the right end of the shaft spiral blade is fixedly connected to the output end of the driving motor. The shaft spiral blade conveys the balls 11 from the feeding end at the right end of the spiral conveying mechanism 9 to the discharge end at the left end of the spiral conveying mechanism 9. An upper cooling pipeline 4 is provided inside the upper die 2, and a lower cooling pipeline 6 is provided inside the lower die 1. One end of the upper cooling pipeline 4 is communicated with the lower cooling pipeline 6, and the other end of the upper cooling pipeline 4 is communicated with the discharge end of the spiral conveying mechanism 9.

[0019] One end of the lower cooling pipeline 6 far from the connection with the upper cooling pipeline 4 is communicated with a discharge pipe, and one end of the discharge pipe far from the upper cooling pipeline 4 is communicated with a liquid suction pump 10. A number of balls 11 that can roll in the upper cooling pipeline 4 and the lower cooling pipeline 6 are placed in both the upper cooling pipeline 4 and the lower cooling pipeline 6. The balls 11 are made of hard plastic. The diameter of the balls 11 is smaller than the diameters of the upper cooling pipeline 4 and the lower cooling pipeline 6. The balls 11 are hollow, and liquid inlet holes are provided on the balls 11, and plugs 14 are hermetically clamped into the liquid inlet holes. The liquid inlet holes are conical holes, the plugs 14 are in a conical shape matching the liquid inlet holes, and an elastic sealing sleeve is sleeved on the circumferential side of the plugs 14. By using the conical hole and conical wedging ability, and matching with the deformation ability of the sealing sleeve, the plugs 14 are clamped into the liquid inlet holes.

[0020] The plugs 14 are made of magnets, positioning blocks 12 are provided on the balls 11, and the positioning blocks 12 are made of magnets. The positioning blocks 12 and the plugs 14 are symmetrically arranged with respect to the diameter of the balls 11, and the opposite sides of the positioning blocks 12 and the plugs 14 have opposite polarities. A first electromagnet 5 for adsorbing the positioning blocks 12 and a second electromagnet 7 for adsorbing the plugs 14 are provided on the lower die 1. The first electromagnet 5 and the second electromagnet 7 are respectively located on the upper and lower sides of the lower cooling pipeline 6. A third electromagnet 3 for adsorbing the positioning blocks 12 is fixedly connected to the upper die 2, and the third electromagnet 3 is located on the side of the upper cooling pipeline 4. The upper part of the discharge pipe is communicated with a bead collecting box 8, and a filter screen is installed on the discharge pipe, and the filter screen is located between the bead collecting box 8 and the liquid suction pump 10. A fourth electromagnet is fixedly connected to the bottom of the bead collecting box 8. An iron magnetic isolation plate 13 is fixedly connected inside the balls 11, and the magnetic isolation plate 13 is located between the positioning blocks 12 and the plugs 14.

[0021] After injection, start the drive motor to operate the screw conveyor mechanism 9. Add the coolant with balls 11 into the screw conveyor mechanism 9. The coolant with balls 11 enters the upper cooling pipe 4 under the action of the screw conveyor mechanism 9, and the coolant flows into the lower cooling pipe 6. Fill the upper cooling pipe 4 and the lower cooling pipe 6 with the coolant at a position higher than the upper cooling pipe 4. At this time, start the liquid suction pump 10 to discharge the coolant from the lower cooling pipe, and at the same time add the coolant with balls 11 to the feeding end of the screw conveyor mechanism 9. Make the coolant continuously flow in the upper cooling pipe 4 and the lower cooling pipe 6 to cool the product in the cavity. Driven by the coolant, the balls 11 roll in the upper cooling pipe 4 and the lower cooling pipe 6.

[0022] When the product is cooled and formed, before removing the upper mold 2, stop adding the coolant into the screw conveyor mechanism 9 and stop the liquid suction pump 10. Make the first electromagnet 5 and the second electromagnet 7 magnetically conductive, so that the positioning block 12 of the first electromagnet 5 is adsorbed, and then the balls 11 rotate and are fixed on the inner wall of the lower cooling pipe 6 with the plug 14 facing downward. At the same time, make the second electromagnet 7 generate a suction force on the plug 14, so that the plug 14 is separated from the balls 11 and the liquid inlet hole is leaked. At this time, the coolant enters the balls 11, so that a gap is generated in the lower cooling pipe 6, and then the coolant in the upper cooling pipe 4 flows into the lower pipe chamber, that is, the coolant in the upper cooling pipe 4 all flows into the lower cooling pipe 6. At this time, make the third electromagnet 3 magnetically conductive, adsorb and fix the positioning block 12 on the balls 11 in the upper cooling pipe 4. At this time, open the mold. Because there is no coolant in the upper cooling pipe 4, the mold will not be contaminated.

[0023] At the same time, due to the presence of the balls 11, the gaps for accommodating the coolant in the upper cooling pipe 4 and the lower cooling pipe 6 are relatively small. Therefore, less coolant needs to be added when closing the mold again, but it can quickly fill the upper cooling pipe 4 and the lower cooling pipe 6, and at the same time ensure that the coolant can be in full contact with the pipe walls of the upper cooling pipe 4 and the lower cooling pipe 6, that is, maintain a sufficiently large heat dissipation area, so as to ensure the heat dissipation effect.

[0024] The above are only embodiments of the present invention, and well-known common knowledge 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 deformations 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 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 and the like described in the specification can be used to interpret the content of the claims.

Claims

1. Injection mold for motorcycle front fender, characterized in that: It includes a feeding mechanism, an upper die and a lower die. The feeding mechanism has a discharging end. An upper cooling pipeline is arranged in the upper die, and a lower cooling pipeline is arranged in the lower die. One end of the upper cooling pipeline is communicated with the lower cooling pipeline, and the other end of the upper cooling pipeline is communicated with the discharging end of the feeding mechanism. One end of the lower cooling pipeline far away from the connection with the upper cooling pipeline is communicated with a discharging pipe, and the end of the discharging pipe far away from the upper cooling pipeline is communicated with a liquid suction pump. A number of balls that can roll in the upper cooling pipeline and the lower cooling pipeline are placed in both the upper cooling pipeline and the lower cooling pipeline. The balls are made of hard plastic, the balls are hollow, liquid inlet holes are arranged on the balls, the liquid inlet holes are conical holes, and conical plugs are hermetically clamped into the liquid inlet holes. The plugs are made of magnets. Positioning blocks are arranged on the balls. The positioning blocks are made of magnets. The positioning blocks and the plugs are symmetrically arranged with respect to the diameter of the balls. The opposite sides of the positioning blocks and the plugs have opposite polarities. A first electromagnet for adsorbing the positioning blocks and a second electromagnet for adsorbing the plugs are arranged on the lower die. The first electromagnet and the second electromagnet are respectively located on the upper and lower sides of the lower cooling pipeline; A magnetic isolation plate made of iron is fixedly connected inside the ball, and the magnetic isolation plate is located between the positioning block and the plug; The feeding mechanism is a spiral conveyor mechanism.

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