An injection mold for an automobile bumper

Abstract

The application belongs to the technical field of bumper molds, and particularly relates to an automobile bumper injection mold, which comprises an air extraction mechanism; the air extraction mechanism comprises a telescopic part; a piston is slidably and sealingly connected in the exhaust hole; a connecting rod is fixedly connected between the output end of the telescopic part and the piston; a first air hole is formed in the piston; an isolation seat is fixedly connected in the bottom of the exhaust hole; a second air hole is formed in the isolation seat; the piston reciprocates in the exhaust hole under the drive of the telescopic part; when the piston moves upwards, negative pressure is generated between the piston and the isolation seat, air in the plastic melt in the cavity can be sucked to the space between the piston and the isolation seat through the second air hole, and then when the piston moves downwards, the air between the piston and the isolation seat is compressed, the air can be extruded upwards through the first air hole, and the air in the cavity can be gradually sucked to the outside of the mold, so that the compactness of the plastic is improved, and the air bubble content is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bumper molds, in particular to an automobile bumper injection mold. BACKGROUND

[0002] The automobile bumper, as one of the most important protective components of the automobile exterior, is widely used in the front and rear ends of the automobile, mainly for absorbing the impact force in the collision to protect the vehicle structure and the safety of the owner. The injection mold is usually provided with exhaust grooves, exhaust holes and other structures, which reduce the air content in the raw materials by natural exhaust. However, the mold cavity structure of the bumper is quite complex, the exhaust structure is difficult to design, the exhaust effect is poor, and the natural exhaust method is difficult to meet the production quality requirements.

[0003] A patent of Chinese patent application CN113386310B discloses a stable injection mold for automobile bumpers, which technical solution points are: including a rack, a lifting assembly, a rotating assembly, a mold pressing assembly and a buffer assembly; the lifting assembly, the rotating assembly and the buffer assembly are arranged on the rack; the mold pressing assembly is arranged on the rotating assembly; the buffer assembly is located below the mold pressing assembly; the upper mold and the lower mold are provided with air valves. The technology sets the lifting assembly and the rotating assembly, uses the lifting seat to drive the mold plate to lift on the rack, uses the moving seat to drive the mold plate to rotate on the turntable, thereby increasing the movement form of the mold in the injection process, driving the mold to rotate, which is conducive to improving the uniformity of the material in the mold and thus improving the production quality of the material; by setting the mold pressing assembly, the mold pressing stability of the upper mold and the lower mold on the mold plate is improved, and the upper mold and the lower mold are facilitated to synchronously rotate with the turntable in the pressed state.

[0004] However, the above-mentioned technology often has the following defects: it adopts the mode of rotating and moving the whole mold to improve the uniformity of the material in the mold, discharge the air in the material and improve the injection quality, but the automobile bumper injection mold is extremely large in weight and size, with a weight of several tons or even dozens of tons and a length of several meters. Such a huge device needs to consume a lot of resources when moving, and is prone to deformation and damage of the mold itself during the movement process, reducing the machining precision and service life of the mold.

[0005] Therefore, the application provides an automobile bumper injection mold. SUMMARY

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.

[0007] The technical solution adopted by the application to solve the technical problems is: the automobile bumper injection mold comprises a mold body, a cavity and a gate.

[0008] Also include a set of uniformly arranged exhaust holes; the exhaust hole is opened between the upper side of the mold body and the cavity; the exhaust hole is internally provided with a suction mechanism; the suction mechanism is used to suck the air inside the plastic melt in the cavity;

[0009] The suction mechanism includes a telescopic member fixedly connected to the upper side of the mold body; the piston is slidingly and sealingly connected inside the exhaust hole; the hollow connecting rod is fixedly connected between the output end of the telescopic member and the piston; the piston is internally provided with a gas hole one, and the gas hole one is aligned with the connecting rod; the connecting rod is internally provided with a gas groove; the exhaust hole is internally fixedly connected with an isolation seat; the isolation seat is internally provided with a gas hole two; the gas hole one and the gas hole two are internally provided with a one-way valve.

[0010] Preferably, the exhaust hole below the isolation seat is internally fixedly connected with a breathable steel insert, and the breathable steel insert is flush with the inner surface of the cavity.

[0011] Preferably, the upper side of the piston is provided with an annular storage groove.

[0012] Preferably, the lower side of the piston is provided with an annular sewage collection groove; the sewage collection groove is slidingly and sealingly connected with a movable ring; a set of springs are uniformly distributed between the movable ring and the sewage collection groove; a set of convex columns are uniformly distributed on the lower side of the movable ring; the convex columns and the movable ring are internally provided with adsorption holes; a set of release holes are uniformly distributed between the sewage collection groove and the storage groove; the adsorption holes and the release holes are internally provided with one-way valves.

[0013] Preferably, the convex column is fixedly connected with a press ring on the lower side; the press ring is designed as a hollow grid.

[0014] Preferably, the bottom of the storage groove is fixedly connected with a cap at the corresponding position of the release hole; a set of guide holes are uniformly distributed on the bottom of the cap.

[0015] Preferably, the top of the storage groove is provided with an annular plugging cover; the plugging cover is connected with the storage groove through threads; a set of through holes are uniformly distributed on the surface of the plugging cover.

[0016] Preferably, the through hole is internally fixedly connected with a mounting plate; a through groove is formed on one side of the mounting plate; a spring piece is fixedly connected inside the through groove; the spring piece extends to the lower side of the mounting plate and has a gap with the mounting plate.

[0017] Preferably, the isolation seat is provided with an annular groove at the upper side edge.

[0018] Preferably, the isolation seat is fixedly connected with a drainage piece at the corresponding position of the gas hole two on the upper side; the drainage piece has a gap with the upper side of the isolation seat.

[0019] The beneficial effects of the present application are as follows:

[0020] 1. The automobile bumper injection mold of the present application, through the telescopic piece drives the piston reciprocating motion inside the exhaust hole, when the piston moves upward, the negative pressure is generated between the piston and the isolation seat, the air inside the plastic melt in the cavity can be sucked to the space between the piston and the isolation seat through the air hole two, and then when the piston moves downward, the air between the piston and the isolation seat is compressed, the air between the piston and the isolation seat can be extruded upward through the air hole one, connecting rod and air groove, through the piston multiple up and down movement, the air in the cavity can be gradually sucked to the outside of the mold, the compactness of the plastic is improved, and the bubble content is reduced.

[0021] 2. The automobile bumper injection mold of the present application, through the control system programs multiple telescopic pieces, so that the movement stroke of the piston increases with the distance between the piston and the gate, that is, the farther from the gate, the greater the movement stroke of the piston of the air extraction mechanism, and the greater the air extraction force, so that the plastic melt in the cavity has the tendency to diffuse and flow from the gate to the periphery, thereby improving the uniformity of the melt distribution, the melt fills the complex, narrow corner gap and extrudes the bubbles therein during the flow process, which can facilitate the air extraction mechanism to extract the air outward, and improve the exhaust efficiency during the bumper injection.

[0022] 3. The automobile bumper injection mold of the present application, through the control system programs multiple telescopic pieces, so that the telescopic periods of the telescopic pieces are opposite when the adjacent air extraction mechanisms work, the opposite movement of the pistons inside the adjacent exhaust holes is controlled, and then the melt between the adjacent exhaust holes inside the cavity is continuously changed in flow direction by using negative pressure, so that the melt carrying bubbles extrude and rub each other, promoting the bubbles between the melt gaps to be released outward, which further facilitates the air extraction mechanism to suck the air. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in conjunction with the drawings.

[0024] Figure 1 is a perspective view of the present application;

[0025] Figure 2 is a structural schematic view of the air extraction mechanism in the present application;

[0026] Figure 3 is a structural schematic view of the piston, isolation seat and air-permeable steel insert in the present application;

[0027] Figure 4 is a disassembled schematic view of the piston in the present application;

[0028] Figure 5 is Figure 4 is a local enlarged view of A in the present application;

[0029] Figure 6is a partial cross-sectional view of the present application;

[0030] Figure 7 is Figure 6 is a partial enlarged view at B in the middle;

[0031] Figure 8 is Figure 7 is a partial enlarged view at C in the middle;

[0032] Figure 9 is Figure 6 is a partial enlarged view at D in the middle.

[0033] In the figure: mold body 1, cavity 2, gate 3, exhaust hole 4, telescopic part 5, piston 6, connecting rod 7, air hole one 8, air groove 9, isolation seat 10, air hole two 11, air permeable steel insert 12, storage tank 13, sewage tank 14, movable ring 15, spring 16, adsorption hole 17, release hole 18, compression ring 19, blocking cap 20, guide hole 21, blocking cover 22, through hole 23, mounting plate 24, through groove 25, spring piece 26, sink groove 27, drainage piece 28. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0035] As Figures 1 to 9 shown, the automobile bumper injection mold of the present application comprises a mold body 1, a cavity 2 and a gate 3;

[0036] It also comprises a set of uniformly arranged exhaust holes 4; the exhaust holes 4 are arranged between the upper side of the mold body 1 and the cavity 2; the exhaust holes 4 are internally provided with a suction mechanism; the suction mechanism is used to suck the air inside the plastic melt in the cavity 2;

[0037] The suction mechanism comprises a telescopic part 5 fixedly connected to the upper side of the mold body 1, which can be a common telescopic cylinder, an electric push rod, etc.; the exhaust hole 4 is internally connected with a piston 6 in sliding sealing manner; the output end of the telescopic part 5 is fixedly connected with a hollow connecting rod 7 with the piston 6; the piston 6 is internally provided with an air hole one 8, which is aligned with the connecting rod 7; the connecting rod 7 is internally provided with an air groove 9; the exhaust hole 4 is internally fixedly connected with an isolation seat 10; the isolation seat 10 is internally provided with an air hole two 11; the air hole one 8 and the air hole two 11 are internally provided with a one-way valve.

[0038] The prior art adopts the mode of rotating and moving the whole mold to improve the uniformity of the material in the mold, and to exhaust the air in the material, thereby improving the injection quality.

[0039] The air exhaust mechanism of the present application is characterized in that: the piston 6 is driven by the telescopic member 5 to reciprocate in the exhaust hole 4, and the piston 6 is in sealing cooperation with the exhaust hole 4, when the piston 6 moves upward, a negative pressure is generated between the piston 6 and the isolation seat 10, at this time, the one-way valve of the air hole one 8 is closed, and the one-way valve of the air hole two 11 is open, so that the air in the plastic melt in the cavity 2 can be sucked to the space between the piston 6 and the isolation seat 10 through the air hole two 11, and then when the piston 6 moves downward, the air between the piston 6 and the isolation seat 10 is compressed, at this time, the one-way valve of the air hole one 8 is open, and the one-way valve of the air hole two 11 is closed, so that the air between the piston 6 and the isolation seat 10 can be extruded upward through the air hole one 8, the connecting rod 7 and the air groove 9, and through the multiple upward and downward movements of the piston 6, the air in the cavity 2 can be gradually sucked to the outside of the mold, thereby improving the compactness of the plastic and reducing the bubble content.

[0040] It is worth noting that another embodiment of the air exhaust mechanism of the present application is that: due to the influence of multiple factors such as melt viscosity, flow path, cavity 2 structure, especially for complex injection parts such as automobile bumpers, the pressure distribution in the cavity 2 is usually uneven, the pressure is higher and the bubbles are less near the gate 3, and the pressure is lower and the bubbles are more away from the gate 3, therefore, the control system is programmed to multiple telescopic members 5, so that the movement stroke of the piston 6 increases with the distance between the piston 6 and the gate 3, that is, the farther away from the gate 3, the greater the movement stroke of the piston 6 of the air exhaust mechanism, and the greater the air exhaust force, so that the plastic melt in the cavity 2 has the tendency to diffuse and flow from the gate 3 to the periphery, thereby improving the uniformity of the melt distribution, and the melt fills the complex and narrow corner gaps in the cavity 2 during the flow process and extrudes the bubbles therein, which can facilitate the air exhaust mechanism to exhaust the air outward, thereby improving the exhaust efficiency during bumper injection.

[0041] It is worth noting that another embodiment of the air exhaust mechanism of the present application is that: through the control system, multiple telescopic members 5 are programmed, so that the telescopic periods of the telescopic members 5 are opposite when the adjacent air exhaust mechanisms work, the pistons 6 in the adjacent exhaust holes 4 are controlled to move in opposite directions, and then the melt between the adjacent exhaust holes 4 in the cavity 2 is continuously changed in flow direction by using negative pressure, so that the melt carrying bubbles extrude and rub each other, promoting the bubbles between the melt gaps to be released outward, thereby facilitating the air exhaust mechanism to suck the air.

[0042] In addition, the piston 6 can scrape and rub the inner wall surface of the exhaust hole 4 during movement, thereby scraping off residual substances in the hole, such as mold lubricants, release agents, plastic additives, carbides, etc., improving the permeability of the exhaust hole 4, and preventing blockage.

[0043] The exhaust hole 4 below the isolation seat 10 is fixedly connected with a gas-permeable steel insert 12 (such as PM-35), and the gas-permeable steel insert 12 is flush with the inner surface of the cavity 2. The microporous structure of the gas-permeable steel allows gas to pass through, but the melt cannot pass through due to surface tension and viscosity, preventing the melt from being drawn upward by the air extraction mechanism when it is working.

[0044] The piston 6 is provided with an annular storage groove 13 on the upper side, and the impurities scraped off from the inner wall surface of the exhaust hole 4 by the upper side of the piston 6 can fall into the storage groove 13 for collection.

[0045] The piston 6 is provided with an annular collection groove 14 on the lower side; the collection groove 14 is slidably and sealingly connected with a movable ring 15; a group of springs 16 are evenly distributed between the movable ring 15 and the collection groove 14; a group of protruding columns are evenly distributed on the lower side of the movable ring 15; adsorption holes 17 are formed in the protruding columns and the movable ring 15; a group of release holes 18 are evenly distributed between the collection groove 14 and the storage groove 13; one-way valves are arranged in the adsorption holes 17 and the release holes 18.

[0046] The impurities scraped off from the inner wall surface of the exhaust hole 4 by the lower side of the piston 6 will fall on the surface of the isolation seat 10. With the up-and-down movement of the piston 6 in the exhaust hole 4, the protruding columns can intermittently contact the upper side of the isolation seat 10 and push the movable ring 15 into the collection groove 14. When the piston 6 moves away from the isolation seat 10, the springs 16 push the movable ring 15 to move downward in the collection groove 14, thereby generating negative pressure in the collection groove 14. At this time, the one-way valve of the adsorption hole 17 is open, and the one-way valve of the release hole 18 is closed. The impurities on the surface of the isolation seat 10 are wrapped in air and sucked into the collection groove 14 through the adsorption hole 17. When the piston 6 moves close to the isolation seat 10, the movable ring 15 moves upward again. At this time, the one-way valve of the adsorption hole 17 is closed, and the one-way valve of the release hole 18 is open. The air and impurities in the collection groove 14 are pushed into the storage groove 13 through the release hole 18, so as to continuously collect the impurities on the surface of the isolation seat 10. Therefore, the impurities scraped off from the upper and lower sides of the piston 6 can be automatically recycled into the storage groove 13, which is convenient for subsequent centralized treatment.

[0047] The convex column lower side is fixedly connected with a pressing ring 19; the pressing ring 19 is designed as a hollow grid. By setting the grid-shaped pressing ring 19, the pressing ring 19 can contact the isolation seat 10 when the piston 6 moves downward, ensuring that the adsorption holes 17 can adsorb the impurities on the surface of the isolation seat 10 through the grid structure of the pressing ring 19, avoiding the problem that the adsorption holes 17 are directly contacted and blocked by the isolation seat 10.

[0048] The bottom of the storage tank 13 is fixedly connected with a cap 20 at the corresponding position of the release hole 18; the bottom of the cap 20 is uniformly distributed with a group of guide holes 21. By setting the cap 20, when the airflow carrying impurities enters the storage tank 13 through the release hole 18, it can be blocked by the cap 20, change the direction of movement after impacting the inner wall of the cap 20, and be discharged through the guide hole 21 towards the side wall of the storage tank 13, thereby preventing the airflow from directly impacting upward and blowing the impurities already collected in the storage tank 13 outward.

[0049] An annular blocking cover 22 is arranged in the top of the storage tank 13; the blocking cover 22 is connected with the storage tank 13 through threads; a group of through holes 23 are uniformly distributed on the surface of the blocking cover 22.

[0050] The inside of the through hole 23 is fixedly connected with a mounting plate 24; one side of the mounting plate 24 is provided with a through slot 25; the through slot 25 is fixedly connected with an elastic sheet 26; the end of the elastic sheet 26 extends to the lower side of the mounting plate 24 and there is a gap between the elastic sheet 26 and the mounting plate 24, and the elastic sheet 26 is in an inclined state.

[0051] The impurities scraped off by the upper side of the piston 6 from the inner wall surface of the exhaust hole 4 can enter the inside of the storage tank 13 downward through the through hole 23 and the gap between the elastic sheet 26 and the mounting plate 24, and with the upward and downward movement of the piston 6, the elastic sheet 26 continuously swings and deforms upward and downward under the action of inertia, which can promote the impurities to pass downward from the gap, while the impurities already collected in the storage tank 13 are difficult to escape outward through the through hole 23 due to the overlapping and shielding between the inclined elastic sheet 26 and the mounting plate 24 when impacted by the airflow.

[0052] In order to clean the impurities, the piston 6 can be removed from the exhaust hole 4 at regular intervals, and then the blocking cover 22 is unscrewed, and the impurities in the storage tank 13 can be poured out.

[0053] The upper side edge of the isolation seat 10 is provided with an annular groove 27. The impurities scraped off by the lower side of the piston 6 from the inner wall surface of the exhaust hole 4 can fall into the inside of the groove 27 along the hole wall, improving the concentration of the impurities, and the adsorption holes 17 are aligned with the groove 27 after the piston 6 is lowered, facilitating the capture of the impurities by the adsorption holes 17.

[0054] The drainage sheet 28 is fixedly connected to the upper side of the isolation seat 10 at a position corresponding to the air hole two 11, and a gap exists between the drainage sheet 28 and the upper side of the isolation seat 10. When the air sucked from the cavity 2 flows upward through the air hole two 11, the air can impact the surface of the drainage sheet 28, and the airflow is guided by the drainage sheet 28, so that the airflow can spread around along the narrow gap between the drainage sheet 28 and the isolation seat 10, thereby blowing the impurities scattered on the upper side surface of the isolation seat 10 into the sink 27, and further improving the collection efficiency of the impurities in the subsequent process.

[0055] The above-mentioned front, rear, left, right, top, bottom are based on the drawings in the specification Figure 1 The front of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and the like is defined in the same manner.

[0056] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0057] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An injection mold for an automobile bumper, comprising a mold body (1), a cavity (2), and a gate (3); Its features are: It also includes a set of evenly arranged vent holes (4); the vent holes (4) are opened between the upper side of the mold body (1) and the cavity (2); each of the vent holes (4) is provided with an air extraction mechanism; the air extraction mechanism is used to extract air from the plastic melt in the cavity (2); The air extraction mechanism includes a telescopic component (5) fixedly connected to the upper side of the mold body (1); a piston (6) is slidably and sealed inside the exhaust hole (4); a hollow connecting rod (7) is fixedly connected between the output end of the telescopic component (5) and the piston (6); an air hole (8) is opened inside the piston (6); an air groove (9) is opened at the bottom of the connecting rod (7); an isolation seat (10) is fixedly connected inside the bottom of the exhaust hole (4); an air hole (11) is opened inside the isolation seat (10); a one-way valve is provided inside both the air hole (8) and the air hole (11); The piston (6) has an annular storage groove (13) on its upper side. The piston (6) has an annular sludge collection groove (14) on its lower side; a movable ring (15) is slidably and sealed inside the sludge collection groove (14); a set of springs (16) are evenly distributed between the movable ring (15) and the sludge collection groove (14); a set of protruding posts are evenly distributed on the lower side of the movable ring (15); an adsorption hole (17) is opened inside the protruding post and the movable ring (15); a set of release holes (18) are evenly distributed between the sludge collection groove (14) and the storage tank (13); a one-way valve is provided inside the adsorption hole (17) and the release hole (18).

2. The automotive bumper injection mold according to claim 1, characterized in that: A breathable steel insert (12) is fixedly connected inside the vent hole (4) below the isolation seat (10), and the breathable steel insert (12) is flush with the inner surface of the cavity (2).

3. The automotive bumper injection mold according to claim 1, characterized in that: A pressure ring (19) is fixedly connected to the lower side of the protruding post; the pressure ring (19) is designed as a hollow mesh.

4. The automotive bumper injection mold according to claim 1, characterized in that: The bottom of the storage tank (13) is fixedly connected with a stop cap (20) at the position corresponding to the release hole (18); a set of guide holes (21) are evenly distributed at the bottom of the stop cap (20).

5. The automotive bumper injection mold according to claim 1, characterized in that: The storage tank (13) is provided with an annular sealing cover (22) at the top; the sealing cover (22) and the storage tank (13) are connected by threads; a set of through holes (23) are evenly distributed on the surface of the sealing cover (22).

6. The automotive bumper injection mold according to claim 5, characterized in that: Each through hole (23) is fixedly connected to a mounting plate (24); a through groove (25) is provided on one side of the mounting plate (24); a spring piece (26) is fixedly connected inside the through groove (25); the end of the spring piece (26) extends to the lower side of the mounting plate (24) and there is a gap between it and the mounting plate (24).

7. The automotive bumper injection mold according to claim 1, characterized in that: An annular groove (27) is provided at the upper edge of the isolation seat (10).

8. The automotive bumper injection mold according to claim 7, characterized in that: A drainage plate (28) is fixedly connected to the upper side of the isolation seat (10) at the position corresponding to the second air hole (11); there is a gap between the drainage plate (28) and the upper side of the isolation seat (10).

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