Polylactic acid injection molding mold for vehicle

Abstract

The utility model discloses a polylactic acid injection molding mould for vehicles, which belongs to the technical field of moulds and comprises a base, a lower mould fixed at the top of the base and an upper mould positioned above the lower mould and mutually clamped with the lower mould, a limit rod is vertically fixed on the outer side of the top of the base, and a limit hole matched with the limit rod is arranged on the upper mould. The limiting rod is vertically arranged at the top of the base, the limiting rod is matched with the limiting hole in the upper mold, the mold clamping effect can be guaranteed, in addition, a trapezoidal sliding block, a first inclined face, a sliding rod and a second inclined face in the limiting rod and a transmission mechanism composed of a transverse plate, a mounting groove and a reset spring in the base are used in cooperation, and the mold clamping effect is improved. And the ejector pin is fixed to the top of the transverse plate, so that when the upper mold descends, the ejector pin can be automatically hidden, after mold opening is thorough, the transmission mechanism automatically controls jacking of the ejector pin, interference of the mold on product pushing is effectively avoided, and practicability is higher.

Description

Technical Field

[0001] The utility model relates to an injection molding die, in particular to a polylactic acid injection molding die for vehicles, belonging to the technical field of molds. Background Art

[0002] In the prior art, for example, the utility model with application number 202021947972.9 discloses an injection molding mold for a polylactic acid material packaging can. In order to solve the problem that it is inconvenient to quickly demold the molded packaging can, which makes it difficult to demold the molded packaging can and affects the production efficiency, a sliding connection between the lower mold and the ejector pin and a threaded connection between the lower mold and the adjusting rod are used to enable the lower mold to shield the ejector pin during injection molding to prevent the ejector pin from affecting the molding. After molding, the molded packaging can can be ejected and quickly demolded, thereby increasing the demolding efficiency of the molded packaging can and thus improving the production efficiency.

[0003] Similar to the above application, there are still some shortcomings:

[0004] The screw is used to control the lifting and lowering of the mold. After injection molding, the ejector pin will slide inside the lower mold when the mold is not fully opened, exerting thrust on the product. Since the mold is not fully opened, the upper mold is likely to interfere with the ejection of the product, and even impact the upper mold to cause damage to the product, reducing the product yield rate and making it inconvenient to use. In addition, the thrust of the ejector pin cannot be dispersed when the product is ejected, and the ejection part is subjected to a large thrust, which is easy to cause damage to the product;

[0005] Therefore, a polylactic acid injection molding mold for automobile is designed to optimize the above problems. Utility Model Content

[0006] The main purpose of the utility model is to provide a polylactic acid injection molding mold for a vehicle. A limit rod is vertically provided on the top of the base, and the limit rod cooperates with the limit hole on the upper mold to ensure the clamping effect of the mold. In addition, a transmission mechanism composed of a trapezoidal slider inside the limit rod, a first inclined surface, a slide rod, a second inclined surface, and a horizontal plate inside the base, a mounting groove and a return spring is used in cooperation with each other. The ejector pin is fixed on the top of the horizontal plate, so that when the upper mold descends, the ejector pin can be automatically hidden, and after the mold is completely opened, the transmission mechanism automatically controls the ejection of the ejector pin, effectively avoiding the mold from interfering with the ejection of the product, and the utility model is more practical. A plurality of groups of slide grooves are evenly provided on the top of the lower mold, and a piston and an ejector rod are slidingly provided inside the slide groove, and then used in cooperation with the air cavity, the first piston on the ejector pin and the ventilation groove, so that when the product is ejected, the local impact force of the ejector pin on the product can be dispersed, and the product can be ejected at multiple points to ensure the integrity of the product.

[0007] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0008] The cam is secured to the bottom of the mould and is adapted to engage with the mould by sliding it downwards, the cam being secured to the top of the mould and being adapted to engage with the mould by sliding it downwards.

[0009] Preferably, a first inclined surface is provided at the bottom of the trapezoidal sliding block close to one end of the sliding rod, and the first inclined surface is fitted with a side edge of the second inclined surface.

[0010] Preferably: a ball is rotatably mounted on the bottom of the trapezoidal sliding block away from one end of the sliding rod, and the inner side of the limiting hole is coated with a wear-resistant coating.

[0011] Preferably, a positioning block is fixed on the top of each limiting rod, and the bottom of the positioning block is parallel to the top of the upper mold.

[0012] Preferably: the top of the lower mold is evenly provided with slide grooves, the inside of the slide grooves are vertically slidably provided with second pistons, the tops of the second pistons are fixed with ejector rods, and the bottom of the slide grooves is provided with an inflation mechanism.

[0013] Preferably, the inflation mechanism comprises an air cavity, a first piston and a ventilation groove, the air cavity is opened inside the lower mold, the ejector pin passes through the air cavity, a first piston is vertically slidably arranged inside the air cavity, the first piston is fixed on the ejector pin, and a ventilation groove is arranged between the air cavity and the slide groove.

[0014] Preferably, the ejector pin and the ejector rod are both cylindrical, and the ejector pin and the ejector rod have the same diameter.

[0015] The beneficial effects of the utility model are:

[0016] The utility model provides a polylactic acid injection molding mold for automobiles. A limit rod is vertically provided on the top of the base, and the limit rod cooperates with the limit hole on the upper mold to ensure the clamping effect of the mold. In addition, a transmission mechanism composed of a trapezoidal slider inside the limit rod, a first inclined surface, a slide rod, a second inclined surface, a horizontal plate inside the base, a mounting groove and a reset spring is used in cooperation. The ejector pin is fixed on the top of the horizontal plate, so that when the upper mold descends, the ejector pin can be automatically hidden. After the mold is completely opened, the transmission mechanism automatically controls the ejector pin to be lifted, effectively avoiding interference of the mold on the launch of the product, and the practicability is higher.

[0017] By evenly opening a plurality of slide grooves on the top of the lower mold, and slidingly setting a piston and a push rod inside the slide groove, and then using it in conjunction with the air cavity, the first piston on the ejector pin and the venting groove, when the product is ejected, the local impact force of the ejector pin on the product can be dispersed, the product can be ejected at multiple points, and the product appearance is guaranteed to be complete. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front cross-sectional view of the initial state of the utility model;

[0019] Figure 2 This is a front cross-sectional view of the utility model in the injection molding state;

[0020] Figure 3 For the utility model Figure 1 Enlarged view of point A in the middle;

[0021] Figure 4 It is a partial structural diagram of the utility model.

[0022] In the figure: 1. base; 2. limit rod; 3. positioning block; 4. upper mold; 5. limit hole; 6. lower mold; 7. ejector pin; 8. sliding hole; 9. trapezoidal slider; 10. first inclined plane; 11. slide rod; 12. second inclined plane; 13. cross plate; 14. mounting groove; 15. return spring; 16. air cavity; 17. first piston; 18. slide groove; 19. second piston; 20. ejector pin; 21. ventilation groove. DETAILED DESCRIPTION

[0023] In order to make the technical solution of the utility model more clear and specific to those skilled in the art, the utility model is further described in detail below in conjunction with embodiments and drawings, but the implementation methods of the utility model are not limited thereto.

[0024] like Figure 1-Figure 4As shown, this embodiment provides a polylactic acid injection molding mold for a vehicle, including a base 1, a lower mold 6 fixed on the top of the base 1, and an upper mold 4 located above the lower mold 6 and engaged with the lower mold 6. A limit rod 2 is vertically fixed to the outer side of the top of the base 1, and a limit hole 5 matching the limit rod 2 is opened on the upper mold 4. The limit rod 2 passes through the limit hole 5 and extends to the top of the upper mold 4. A sliding hole 8 is vertically opened inside the limit rod 2. A trapezoidal slider 9 is horizontally slidably arranged on the outer side of the limit rod 2 below the upper mold 4, and the trapezoidal The beveled edge of the top of the slider 9 is located below the upper mold 4, a slide rod 11 is vertically slidably installed inside the slide hole 8, a second bevel 12 is provided on the top of the slide rod 11 close to the trapezoidal slider 9, a mounting groove 14 is provided inside the base 1, a cross plate 13 is vertically slidably provided inside the mounting groove 14, the bottom end of the slide rod 11 is fixedly connected to the cross plate 13, a return spring 15 is provided at the bottom of the cross plate 13 and the inner bottom of the mounting groove 14, an ejector pin 7 is fixed at the middle position of the top of the cross plate 13, and the ejector pin 7 passes through the lower mold 6 and is slidably connected to the lower mold 6.

[0025] The overall working principle is as follows: during installation, the base 1 is fixed on the workbench, and the top of the upper mold 4 is connected to the output end of the hydraulic cylinder. When the mold is opened and closed, the hydraulic cylinder controls the lifting of the upper mold 4. When the upper mold 4 moves downward, the trapezoidal slider 9 is squeezed first, and the trapezoidal slider 9 is squeezed into the inside of the slide hole 8. At the same time, the trapezoidal slider 9 contacts the second inclined surface 12 at the top of the slide rod 11, and exerts downward pressure on the slide rod 11. At this time, the slide rod 11 controls the horizontal plate 13 and the ejector pin 7 to move downward, squeezes the reset spring 15, and hides the ejector pin 7 inside the lower mold 6. During the downward movement of the upper mold 4, the end of the trapezoidal slider 9 will always fit with the inner wall of the limiting hole 5, and the ejector pin 7 is in a hidden state. After the mold is closed, the hot-melt polylactic acid is injected from the pouring port. After the injection of the polylactic acid is completed, it is cooled. When the product is injection-molded and the mold is opened, the ejector pin 7 will not apply an upward thrust to the product before the upper mold 4 moves to the initial state. After the upper mold 4 moves to the top of the trapezoidal slider 9, the reset spring 15 automatically resets, and the ejector pin 7 automatically resets, applying an upward thrust to the product, and the product is separated from the lower mold 6.

[0026] In this embodiment, a first inclined surface 10 is formed at the bottom of the trapezoidal sliding block 9 near one end of the sliding rod 11 , and the first inclined surface 10 is in contact with the side of the second inclined surface 12 .

[0027] Partial working principle: The setting of the first inclined surface 10 on the trapezoidal slider 9 increases the contact area with the second inclined surface 12 and reduces the wear between the trapezoidal slider 9 and the slide rod 11.

[0028] In this embodiment, a ball is rotatably mounted on the bottom of one end of the trapezoidal sliding block 9 away from the sliding rod 11, and the inner side of the limiting hole 5 is coated with a wear-resistant coating.

[0029] Partial working principle: After the trapezoidal slider 9 is located inside the limiting hole 5, the rolling friction between the ball and the limiting hole 5 reduces the wear between the trapezoidal slider 9 and the limiting hole 5.

[0030] In this embodiment, a positioning block 3 is fixed to the top of each limiting rod 2 , and the bottom of the positioning block 3 is parallel to the top of the upper mold 4 .

[0031] Partial working principle: By using the positioning block 3, the rising height of the upper mold 4 can be limited to ensure that the upper mold 4 and the lower mold 6 are integrated.

[0032] In this embodiment, the top of the lower mold 6 is evenly provided with a slide groove 18, the interior of the slide groove 18 is vertically slidably provided with a second piston 19, the top of the second piston 19 is fixed with a push rod 20, and the bottom of the slide groove 18 is provided with an inflation mechanism.

[0033] Partial working principle: When the product is ejected, following the movement of the ejector pin 7, the inflation mechanism injects gas into the interior of the slide groove 18, controls the upward movement of the second piston 19 and the ejector rod 20, and applies thrust to the product simultaneously with the ejector pin 7.

[0034] In this embodiment, the inflation mechanism includes an air cavity 16, a first piston 17 and a ventilation groove 21. The air cavity 16 is opened inside the lower mold 6. The ejector pin 7 passes through the inside of the air cavity 16. The first piston 17 is vertically slidably provided inside the air cavity 16. The first piston 17 is fixed on the ejector pin 7. A ventilation groove 21 is provided between the air cavity 16 and the slide groove 18.

[0035] Partial working principle: when the ejector pin 7 is hidden inside the lower mold 6, the ejector pin 7 drives the first piston 17 to move downward, and the gas inside the slide groove 18 is pumped into the knife air cavity 16, and the ejector rod 20 is hidden inside the knife slide groove 18. When the ejector pin 7 moves upward, the first piston 17 fills the gas inside the air cavity 16 into the slide groove 18, and at the same time pushes the ejector rod 20 upward, applying thrust at multiple points on the bottom of the product to ensure horizontal demoulding of the product.

[0036] In this embodiment, both the ejector pin 7 and the ejector rod 20 are cylindrical, and the ejector pin 7 and the ejector rod 20 have the same diameter.

[0037] Local working principle: ensures that the force at each position of the product is balanced during the demoulding process, and the product can be pushed out horizontally.

[0038] The above is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present invention according to the technical solution and concept of the present invention, which fall within the protection scope of the present invention.

Claims

1. A polylactic acid injection molding mold for a vehicle, comprising a base (1), a lower mold (6) fixed to the top of the base (1), and an upper mold (4) located above the lower mold (6) and engaged with the lower mold (6), characterized in that: A limiting rod (2) is vertically fixed on the outer side of the top of the base (1); a limiting hole (5) cooperating with the limiting rod (2) is provided on the upper mold (4); the limiting rod (2) passes through the limiting hole (5) and extends to the upper side of the upper mold (4); a sliding hole (8) is vertically provided inside the limiting rod (2); a trapezoidal sliding block (9) is horizontally slidably provided on the outer side of the limiting rod (2) below the upper mold (4); the top bevel of the trapezoidal sliding block (9) is located below the upper mold (4); a sliding rod (11) is vertically slidably installed inside the sliding hole (8); A second inclined surface (12) is provided on one side of the top of the slide rod (11) close to the trapezoidal slide block (9), a mounting groove (14) is provided inside the base (1), a horizontal plate (13) is vertically slidably provided inside the mounting groove (14), the bottom end of the slide rod (11) is fixedly connected to the horizontal plate (13), a return spring (15) is provided at the bottom of the horizontal plate (13) and the inner bottom of the mounting groove (14), an ejector pin (7) is fixed at the middle position of the top of the horizontal plate (13), and the ejector pin (7) passes through the lower mold (6) and is slidably connected to the lower mold (6).

2. The polylactic acid injection molding mold for automobile according to claim 1, characterized in that: A first inclined surface (10) is provided at the bottom of the trapezoidal sliding block (9) close to one end of the sliding rod (11), and the first inclined surface (10) is in contact with the side edge of the second inclined surface (12).

3. The polylactic acid injection molding mold for automobile according to claim 1, characterized in that: A ball is rotatably mounted on the bottom of one end of the trapezoidal slider (9) away from the slide rod (11), and the inner side of the limiting hole (5) is coated with a wear-resistant coating.

4. The polylactic acid injection molding mold for automobile according to claim 1, characterized in that: A positioning block (3) is fixed on the top of each limiting rod (2), and the bottom of the positioning block (3) is parallel to the top of the upper mold (4).

5. The polylactic acid injection molding mold for automobile according to claim 1, characterized in that: The top of the lower mold (6) is evenly provided with a slide groove (18), the interior of the slide groove (18) is vertically slidably provided with a second piston (19), the top of the second piston (19) is fixed with a push rod (20), and the bottom of the slide groove (18) is provided with an inflation mechanism.

6. The polylactic acid injection molding die for automobiles according to claim 5, characterized in that: The inflation mechanism comprises an air cavity (16), a first piston (17) and a ventilation groove (21); the air cavity (16) is opened inside the lower mold (6); the ejector pin (7) passes through the air cavity (16); the first piston (17) is vertically slidably arranged inside the air cavity (16); the first piston (17) is fixed on the ejector pin (7); and the ventilation groove (21) is arranged between the air cavity (16) and the slide groove (18).

7. The polylactic acid injection molding die for automobiles according to claim 6, characterized in that: The ejector pin (7) and the ejector rod (20) are both cylindrical, and the ejector pin (7) and the ejector rod (20) have the same diameter.

Images