Injection mold and injection method for automobile backup battery top cover

Abstract

This invention relates to the field of injection mold technology, and in particular to an injection mold for an automotive spare battery top shell, comprising a lower mold base, an upper mold base, and a side slide; the side slide includes a core-pulling drive block, a front insert, a rear insert, and a bottom insert, with a hydraulic cylinder connected to the right side of the bottom insert; when the hydraulic cylinder drives the bottom insert to move to the right by a first oblique distance, the bottom insert can be demolded from the bottom of the L-shaped assembly groove; after the upper mold base moves upward by a first vertical distance, the core-pulling drive block can link the front insert to move backward and the rear insert to move forward to demold from the L-shaped assembly groove; when the upper mold base moves upward by a second vertical distance and the hydraulic cylinder drives the bottom insert to move to the right by a second oblique distance, it can link the upper mold core to move upward and the bottom insert to move to the right by a second oblique distance, causing the core-pulling drive block, the front insert, and the rear insert to move to the right and exit the L-shaped assembly groove. It also relates to an injection molding method for an automotive spare battery top shell. Compared with the prior art, this method ensures that the surface roughness of the L-shaped assembly groove meets design requirements and improves production efficiency.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to an injection mold and injection method for a top shell of an automotive backup battery. Background Technology

[0002] New energy vehicles are increasingly equipped with backup batteries, realizing a "dual battery system." The backup battery provides emergency power when the main battery fails or is depleted, thereby improving the overall reliability and safety of new energy vehicles. Currently, the backup battery needs to be installed inside a battery casing, which is then secured to the vehicle frame using clips or screws.

[0003] In the relevant technical field, the automotive backup battery casing includes a top shell and a bottom shell assembled together, with a cavity formed between the top and bottom shells to accommodate the backup battery. Currently, the inventor manufactures automotive backup battery top shells according to manufacturer requirements. The top of the top shell needs to have an L-shaped mounting groove, which is used to fit the mounting posts of the vehicle frame for post-slot fitting assembly, thereby completing the detachable assembly of the automotive backup battery.

[0004] The inventors manufacture the top shell of the automotive backup battery housing by injection molding the top shell body using an upper and lower mold, and then using a side slide to mate with the upper and lower molds to injection mold an L-shaped assembly groove for the top shell body. However, in actual production, the inventors found that due to the manufacturer's design precision requirements for the L-shaped assembly groove, it is necessary to ensure that all surfaces of the L-shaped assembly groove are flat without draft angles, and the surface roughness needs to be controlled within Ra0.1μm-Ra0.25μm.

[0005] Based on the above technical requirements, the inventors discovered in actual production operations that during the drafting process of the side slide, scratches occur on the surface of the L-shaped assembly groove, making its roughness difficult to control. This necessitates CNC milling of the L-shaped assembly groove after the top shell is injection molded to achieve the designed surface roughness. However, this machining method involves numerous steps, severely limiting the production efficiency of the top shell. Furthermore, as the wear of the side slide gradually increases, the injection-molded L-shaped assembly groove gradually becomes smaller. During the milling of the L-shaped assembly groove, if the feed rate of the CNC milling is not adjusted in time, excessive milling can cause vibration in the top shell. This vibration affects the overall milling accuracy of the L-shaped assembly groove, resulting in large tolerances and situations where the assembly pillar cannot be inserted into the assembly groove, severely limiting the assembly reliability and production yield of the top shell.

[0006] Therefore, a new technical solution needs to be researched to address the above problems. Summary of the Invention

[0007] In view of this, the present invention addresses the deficiencies of the prior art, and its main objective is to provide an injection mold for the top shell of an automotive spare battery, effectively solving the technical problems of low production efficiency and low production yield in the injection molds used for injection molding automotive spare battery top shells in the prior art.

[0008] This invention provides an injection mold for the top cover of an automotive backup battery, comprising:

[0009] The lower mold base has a lower mold core on top;

[0010] The upper mold base has an upper mold core that can move up and down at its bottom; when the upper mold base moves down and closes with the lower mold base, the upper mold core and the lower mold core can form a molding cavity for injection molding the top shell of the battery; and,

[0011] The side slide is an L-shaped assembly slot that can extend into the molding cavity to injection mold the top shell of the battery. The side slide includes a core-pulling drive block that can move left and right on the upper mold base, a front insert that can move up and down on the front side of the core-pulling drive block, a rear insert that can move up and down on the rear side of the core-pulling drive block, and a bottom insert that can move diagonally left and right at the bottom of the core-pulling drive block. A hydraulic cylinder is connected to the right side of the bottom insert.

[0012] When the hydraulic cylinder drives the bottom insert to move to the right by a first oblique distance, the bottom insert can be demolded from the bottom of the L-shaped assembly groove. When the upper mold base moves up by a first vertical distance, the core-pulling drive block can move the front insert backward and the rear insert forward to demold from the L-shaped assembly groove. When the upper mold base moves up by a second vertical distance and the hydraulic cylinder drives the bottom insert to move to the right by a second oblique distance, the upper mold core can move up and the bottom insert can move to the right by a second oblique distance, causing the core-pulling drive block, the front insert, and the rear insert to move to the right and exit the L-shaped assembly groove.

[0013] The beneficial effect of the injection mold for the top shell of the automotive spare battery provided by the present invention is that, during the demolding operation, the bottom insert is first driven to move to the right by a first oblique distance by a hydraulic cylinder so that the bottom insert can be demolded from the L-shaped assembly groove. Then, the upper mold base moves up by a first vertical distance so that the core-pulling drive block moves the front insert backward and the rear insert moves forward to demold from the L-shaped assembly groove. Finally, the upper mold base moves up by a second vertical distance and the hydraulic cylinder drives the bottom insert to move to the right by a second oblique distance, which can link the upper mold core to move up and the bottom insert to move to the right by a second oblique distance, so that the core-pulling drive block, the front insert and the rear insert move to the right and exit the L-shaped assembly groove.

[0014] Compared with existing technologies, firstly, by controlling the demolding of the bottom insert first, and then controlling the demolding of the front and rear inserts, the demolding operation can be completed before the side slide completely exits the L-shaped assembly groove. This prevents the side slide from scratching the L-shaped assembly groove during the exit process, ensuring that the surface roughness of the L-shaped assembly groove meets the design requirements. Subsequent CNC milling is not required, thereby improving the molding yield and production efficiency of the battery top shell.

[0015] Secondly, by reducing the friction that occurs during the process of the side slide exiting the L-shaped assembly slot, the service life of the side slide is extended. This ensures that the side slide will not undergo significant dimensional changes due to friction during the continuous injection molding of the L-shaped assembly slot, thus ensuring that the injection molding dimensions of the L-shaped assembly slot meet the design requirements. This guarantees that the assembly pillars of the vehicle frame can be used for pillar slot insertion and assembly, thereby improving the production yield of the battery top cover.

[0016] As a preferred embodiment, a mold core clearance notch is provided on the right side of the upper mold core, and the mold core clearance notch penetrates the upper surface and the right side of the upper mold core;

[0017] The hydraulic cylinder is fixed to the upper mold core by a cylinder body fixing seat and located on the right side of the mold core clearance notch. The telescopic rod extends and retracts obliquely toward the side of the mold core clearance notch. The telescopic rod of the hydraulic cylinder is fixedly installed with a heat insulation block. The heat insulation block has two mirrored side positions set in front and behind.

[0018] As a preferred embodiment, the upper mold core is provided with a sliding mounting cavity that can connect the molding chamber and the mold core clearance notch, and the upper mold core is provided with a first abutting part at the bottom of the connection between the sliding mounting cavity and the mold core clearance notch;

[0019] When the hydraulic cylinder drives the bottom insert to move to the left and abuts against the left side of the molding chamber, the first abutting part abuts against the bottom right side of the bottom insert.

[0020] As a preferred embodiment, the mold core clearance notch is provided with two stroke limiting seats, the two stroke limiting seats are spaced apart front to back, and the heat insulation block can slide obliquely left and right between the two stroke limiting seats;

[0021] The bottom of the upper mold base is provided with a first pressure-holding limiting block, and the heat insulation block is provided with a first pressure-holding limiting hole for the first pressure-holding limiting block to be inserted;

[0022] When the hydraulic cylinder drives the bottom insert to move to the left and abuts against the left side of the molding chamber, the upper mold base can move down in conjunction with the upper mold core to close the mold and insert the first pressure holding limiting block into the first pressure holding limiting hole to lock the side movement.

[0023] As a preferred embodiment, the core-pulling drive block includes a first movement limiting part that extends to the left and right and a drive body part that is integrally formed at the bottom of the first movement limiting part and extends downward to the row mounting cavity;

[0024] The top of the slide mounting cavity is provided with a first movement limiting groove for the first movement limiting part to be movably inserted. The first movement limiting groove extends to the right through the right side of the upper mold core and connects to the mold core avoidance notch.

[0025] As a preferred embodiment, the front surface of the drive body is provided with a first inclined surface that slopes backward from top to bottom, and the rear surface is provided with a second inclined surface that slopes forward from top to bottom. Both the first and second inclined surfaces are provided with a second movement limiting groove, which extends through the upper and lower ends of the drive body along the extending direction of the first and second inclined surfaces.

[0026] The front insert has a third inclined surface adapted to the first inclined surface on its rear side, and the rear insert has a fourth inclined surface adapted to the second inclined surface on its front side. Both the third and fourth inclined surfaces have a second movement limiting part that can be movably inserted into the second movement limiting groove.

[0027] As a preferred embodiment, the bottom of the drive body is provided with a first clearance slope, which is inclined upward from left to right; the top of the bottom insert is provided with a second clearance slope, which is inclined upward from left to right and has the same slope as the first clearance slope.

[0028] The bottom left side of the drive body is provided with a first linkage protrusion, and the top left side of the bottom insert is provided with a first linkage groove. The first linkage protrusion can be inserted into the first linkage groove.

[0029] As a preferred option, the width of the left end of the bottom inlay in the front-to-back direction is smaller than the width of the right end of the bottom inlay in the front-to-back direction, so that the bottom inlay as a whole has a structure that is smaller on the left and larger on the right.

[0030] The bottom insert has a first extended inclined surface adapted to the first inclined surface on the front side and a second extended inclined surface adapted to the second inclined surface on the rear side.

[0031] As a preferred embodiment, the upper mold base is provided with an injection port and a runner plate that connects to the injection port; the upper mold core is provided with an injection nozzle, the top of which can connect to the runner plate and the bottom of which can connect to the molding chamber.

[0032] The lower mold base is provided with an ejector plate, and the top of the ejector plate is provided with an ejector insert. The ejector insert extends upward to the upper surface of the lower mold core, and the ejector insert protrudes from the upper surface of the lower mold core through the upward linkage of the ejector plate.

[0033] This invention also provides an injection molding method for an automotive backup battery top cover, applied to an injection mold for the automotive backup battery top cover; the injection molding method includes...

[0034] Step 1: Provide an injection molding machine and install the injection mold for the automotive spare battery top cover onto the injection molding machine. The upper mold base, upper mold core, and ejector plate are moved in conjunction with the ejector mechanism of the injection molding machine.

[0035] Step 2: The extension rod of the hydraulic cylinder extends, driving the bottom insert to move diagonally to the left, and simultaneously moving the core-pulling drive block, the front insert, and the rear insert to the left to reset.

[0036] Step 3: The ejector mechanism drives the upper mold base and the lower mold core to move down, so that the upper mold base and the lower mold core close together, and the upper mold core and the lower mold core can form a cavity.

[0037] Step 4: The hot melt slurry is injected into the molding chamber through the extrusion system of the injection molding machine from the injection port, the manifold plate and the injection nozzle to injection mold the top shell of the battery.

[0038] Step 5: The hydraulic cylinder drives the bottom insert to move to the right by the first oblique distance, so that the bottom insert can be demolded from the L-shaped assembly groove.

[0039] Step 6: The ejector mechanism drives the upper mold base to move up a first vertical distance, so that the core-pulling drive block moves up a first vertical distance synchronously and moves the front insert backward and the rear insert forward in conjunction with the L-shaped assembly groove to demold.

[0040] Step 7: The upper mold base moves up a second vertical distance and moves up synchronously with the upper mold core. At the same time, the hydraulic cylinder drives the bottom insert to move to the right a second oblique distance, so that the bottom insert moves to the right in conjunction with the core pulling drive block, the front insert and the rear insert to exit the L-shaped assembly groove and the upper mold core and the battery top shell are demolded.

[0041] Step 8: The ejector mechanism drives the ejector plate to move upward, causing the ejector insert to protrude from the upper surface of the lower mold core and eject the battery top shell from the lower mold core for unloading.

[0042] Step 9: Repeat steps 2-8 to continue injection molding and unload the battery top shell.

[0043] The beneficial effect of the injection molding method for the top shell of a car spare battery provided by the present invention is that, compared with the prior art, by controlling the demolding of the bottom insert first, and then controlling the demolding of the front insert and the rear insert, the demolding operation can be completed before the side slide completely exits the L-shaped assembly groove. This prevents the side slide from scratching the L-shaped assembly groove during the exit process, ensuring that the surface roughness of the L-shaped assembly groove meets the design requirements. Subsequent CNC milling is not required, thereby improving the molding yield and production efficiency of the battery top shell. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a three-dimensional structural schematic diagram of the injection mold for the top shell of a car backup battery provided in an embodiment of this application;

[0046] Figure 2 yes Figure 1 A schematic diagram of the specific three-dimensional structure of the lower mold base of the injection mold for the top shell of the automotive spare battery.

[0047] Figure 3 yes Figure 1 A schematic diagram of the specific three-dimensional structure of the upper mold base of the injection mold for the top shell of the automotive spare battery.

[0048] Figure 4 yes Figure 1 A cross-sectional view of the linkage mechanism of the injection mold for the top cover of the automotive backup battery shown.

[0049] Figure 5 yes Figure 1 A cross-sectional view at point AA of the injection mold for the top cover of the automotive backup battery.

[0050] Figure 6 yes Figure 1 A cross-sectional view of the injection mold at point BB of the top shell of the automotive spare battery shown.

[0051] Figure 7 yes Figure 6 A magnified view of part A of the injection mold for the top cover of the automotive spare battery shown;

[0052] Figure 8 yes Figure 1 A cross-sectional view at the CC section of the injection mold for the top cover of the automotive spare battery shown.

[0053] Figure 9 yes Figure 8 A magnified view of part B of the injection mold for the top cover of the automotive spare battery shown.

[0054] Figure 10 yes Figure 6 The diagram shows the state of the bottom insert and the core-pulling drive block of the injection mold for the top shell of the automotive spare battery after the mold is closed.

[0055] Figure 11 yes Figure 10 The diagram shows the state of the bottom insert of the injection mold for the top cover of the automotive spare battery moving a first oblique distance.

[0056] Figure 12 yes Figure 11 The diagram shows the state of the core-pulling drive block of the injection mold for the top shell of the automotive spare battery moving a first vertical distance.

[0057] Figure 13 yes Figure 6 The right view of the bottom insert of the injection mold for the top cover of the automotive spare battery shown;

[0058] Figure 14 yes Figure 1 A three-dimensional structural diagram of the side slide of the injection mold for the top cover of a car backup battery is shown.

[0059] Figure 15 yes Figure 1 The diagram shows a three-dimensional structure of the battery top shell produced by injection molding using an injection mold.

[0060] The following are the labeling elements in the figure:

[0061] 100. Injection mold for the top cover of a car spare battery;

[0062] 10. Lower mold base; 11. Lower mold core; 110. Forming punch; 12. Ejector plate; 121. Ejector insert;

[0063] 20. Upper mold base; 21. Upper mold core; 210. Forming die; 211. Mold core clearance notch; 212. Slide mounting cavity; 2121. First movement limiting groove; 213. First abutment part; 214. Stroke limiting seat; 22. First pressure holding limiting block; 23. Injection port; 24. Runner plate; 25. Injection nozzle;

[0064] 30. Molding chamber;

[0065] 40. Side-mounted position; 41. Core-pulling drive block; 411. First movement restriction part; 412. Drive body part; 4121. First inclined surface; 4122. Second inclined surface; 4123. Second movement restriction groove; 4124. First clearance inclined surface; 4125. First linkage protrusion; 42. Front insert; 421. Third inclined surface; 422. Second movement restriction part; 43. Rear insert; 431. Fourth inclined surface; 44. Bottom insert; 441. Second clearance inclined surface; 442. First linkage groove; 443. First extension inclined surface; 444. Second extension inclined surface; 45. Hydraulic cylinder; 451. Cylinder body fixing seat; 452. Telescopic rod; 453. Heat insulation block; 4531. First pressure holding restriction hole;

[0066] 50. Linkage mechanism; 51. Linkage fixing seat; 511. Linkage limiting hole; 512. Linkage limiting shaft; 52. First linkage rod; 521. First protrusion; 53. Second linkage rod; 531. First notch;

[0067] 200. Battery top cover; 2001. L-shaped assembly slot. Detailed Implementation

[0068] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0069] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0070] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0072] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0073] Please refer to the following: Figures 1 to 15 The injection mold 100 for the top cover of a car backup battery provided in this application will now be described. The injection mold 100 for the top cover of the car backup battery includes a lower mold base 10, an upper mold base 20, and a side slide 40.

[0074] The lower mold base 10 has a lower mold core 11 at its top, and the upper mold base 20 has an upper mold core 21 that can move up and down at its bottom. When the upper mold base 20 moves down and closes with the lower mold base 10, the upper mold core 21 and the lower mold core 11 can form a molding chamber 30 for injection molding the battery top shell 200. The side slide 40 can extend into the molding chamber 30 to injection mold the L-shaped assembly groove 2001 of the battery top shell 200. The side slide 40 includes a core-pulling drive block 41 that can move left and right, a front insert 42 that can move up and down in front of the core-pulling drive block 41, a rear insert 43 that can move up and down in front of the core-pulling drive block 41, and a bottom insert 44 that can move obliquely left and right at the bottom of the core-pulling drive block 41. A hydraulic cylinder 45 is connected to the right side of the bottom insert 44. When the hydraulic cylinder 45 drives the bottom insert 44 to move to the right by a first oblique distance, the bottom insert 44 can be demolded from the bottom of the L-shaped assembly groove 2001; when the upper mold base 20 moves up by a first vertical distance, the core-pulling drive block 41 can move the front insert 42 backward and the rear insert 43 forward to demold from the L-shaped assembly groove 2001; when the upper mold base 20 moves up by a second vertical distance and the hydraulic cylinder 45 drives the bottom insert 44 to move to the right by a second oblique distance, the upper mold core 21 can move up and the bottom insert 44 can move to the right by a second oblique distance, so that the core-pulling drive block 41, the front insert 42 and the rear insert 43 move to the right and exit the L-shaped assembly groove 2001.

[0075] Specifically, during the demolding operation, the bottom insert 44 is first moved to the right by a first oblique distance by the hydraulic cylinder 45, allowing the bottom insert 44 to demold from the L-shaped assembly groove. Then, the upper mold base 20 moves up by a first vertical distance, causing the core-pulling drive block 41 to move backward along with the front insert 42 and the rear insert 43 to move forward along with the L-shaped assembly groove. Finally, the upper mold base 20 moves up by a second vertical distance, and the hydraulic cylinder 45 drives the bottom insert 44 to move to the right by a second oblique distance, which can move the upper mold core 21 up and the bottom insert 44 to the right by a second oblique distance, causing the core-pulling drive block 41, the front insert 42, and the rear insert 43 to move to the right and exit the L-shaped assembly groove. Compared with existing technologies, firstly, by controlling the demolding of the bottom insert 44 first, and then controlling the demolding of the front insert 42 and the rear insert 43, the demolding operation can be completed before the side slide 40 completely exits the L-shaped assembly slot. This prevents the side slide 40 from scratching the L-shaped assembly slot during its exit, ensuring that the surface roughness of the L-shaped assembly slot meets the design requirements. Subsequent CNC milling is unnecessary, thus improving the molding yield and production efficiency of the battery top shell. Secondly, by reducing the friction that occurs during the exit of the side slide 40 from the L-shaped assembly slot, the service life of the side slide 40 is extended. This ensures that the side slide 40 will not undergo significant dimensional changes due to friction during continuous injection molding of the L-shaped assembly slot, thus ensuring that the injection molding dimensions of the L-shaped assembly slot meet the design requirements. This guarantees that the mounting pillars of the vehicle frame can be used for subsequent insertion and assembly, improving the production yield of the battery top shell.

[0076] More specifically, the lower mold core 11 is provided with a forming punch 110 at its top, and the upper mold core 21 is provided with a forming die 210 at its top. When the upper mold base 20 and the lower mold base 10 are closed, the forming punch 110 of the lower mold core 11 and the forming die 210 of the upper mold core 21 can form a cavity 30. The side slide 40 extends from the right side of the forming cavity of the upper mold core 21 into the forming cavity 30 to cooperate with the L-shaped assembly groove of the injection molded battery top shell.

[0077] Understandably, since the top of the core-pulling drive block 41 can be moved left and right and installed at the bottom of the upper mold base 20, and extends downward to the molding chamber 30 through the sliding mounting cavity 212, the front insert 42, the rear insert 43 and the bottom insert 44 are located at the bottom of the core-pulling drive block 41, so that the front insert 42, the rear insert 43 and the bottom insert 44 form a structure for injection molding L-shaped assembly groove in the molding chamber 30.

[0078] In some embodiments, a mold core clearance notch 211 is provided on the right side of the upper mold core 21, and the mold core clearance notch 211 penetrates the upper surface and right side of the upper mold core 21; the hydraulic cylinder 45 is fixedly mounted on the upper mold core 21 via a cylinder body fixing seat 451 and located on the right side of the mold core clearance notch 211, and the telescopic rod 452 extends and retracts obliquely toward the mold core clearance notch 211. A heat insulation block 453 is fixedly installed on the telescopic rod 452 of the hydraulic cylinder 45, and the heat insulation block 453 has two mirror-image side slides 40 arranged one in front of the other. By setting the heat insulation block 453 to isolate the side slides 40 from the telescopic rod 452 of the hydraulic cylinder 45, it can be ensured that when the side slides 40 are performing injection molding operations, the heat of the hot melt slurry will not be transferred to the telescopic rod 452 of the hydraulic cylinder 45 through the side slides 40, thereby ensuring the stability of the hot melt slurry during injection molding, and ensuring the reliability and production yield of the injection molding operation.

[0079] Specifically, the upper mold core 21 is provided with a sliding mounting cavity 212 that connects the molding chamber 30 and the mold core clearance notch 211. A first abutment part 213 is provided at the bottom of the upper mold core 21 where the sliding mounting cavity 212 connects to the mold core clearance notch 211. When the hydraulic cylinder 45 drives the bottom insert 44 to move to the left and abut against the left side of the molding chamber 30, the first abutment part 213 abuts against the bottom right side of the bottom insert 44. This structure ensures the reliability of the movement of the bottom insert 44 and the accuracy of its final position after mold closing.

[0080] More specifically, the mold core clearance notch 211 is provided with two stroke limiting seats 214, the two stroke limiting seats 214 are spaced apart front and rear, and the heat insulation block 453 can slide obliquely left and right between the two stroke limiting seats 214; the bottom of the upper mold base 20 is provided with a first pressure holding limiting block 22, and the heat insulation block 453 is provided with a first pressure holding limiting hole 4531 for the first pressure holding limiting block 22 to be inserted; when the hydraulic cylinder 45 drives the bottom insert 44 to move to the left and abut against the left side of the molding chamber 30, the upper mold base 20 can move the upper mold core 21 down to close the mold and insert the first pressure holding limiting block 22 into the first pressure holding limiting hole 4531 to lock the side slide position 40.

[0081] It is understandable that after the upper mold base 20 and the lower mold base 10 are closed, the core-pulling drive block 41 is restricted to its specific position in the vertical direction by the upper mold base 20, and the bottom insert 44 is restricted to its position in the vertical direction by the first abutment part 213. Furthermore, the bottom insert 44 is restricted to its oblique movement position by the first pressure-holding limiting block 22 and the first pressure-holding limiting hole 4531 structure. At the same time, there is a connection between the core-pulling drive block 41, the front insert 42, the rear insert 43, and the bottom insert 44. This ensures that after the upper mold base 20 and the lower mold base 10 are closed, the positions of the core-pulling drive block 41, the front insert 42, the rear insert 43, and the bottom insert 44 meet the design requirements. It also ensures that during the subsequent injection of hot melt slurry and pressure holding process of the injection mold, the positions of the core-pulling drive block 41, the front insert 42, the rear insert 43, and the bottom insert 44 will not be displaced due to pressure, thereby improving the overall reliability of the injection molding operation and the product molding yield.

[0082] Preferably, the core-pulling drive block 41 includes a first movement limiting part 411 extending left and right and a drive body part 412 integrally formed at the bottom of the first movement limiting part 411 and extending downward to the sliding mounting cavity 212; the top of the sliding mounting cavity 212 is provided with a first movement limiting groove 2121 for the first movement limiting part 411 to be movably inserted into, and the first movement limiting groove 2121 extends to the right through the right side of the upper mold core 21 and connects to the mold core clearance notch 211. That is to say, the first movement limiting groove 2121 can extend to the mold core clearance notch 211 so that the drive body part 412 has sufficient displacement stroke when it moves to the right. The front surface of the drive body 412 has a first inclined surface 4121 that slopes backward from top to bottom, and the rear surface has a second inclined surface 4122 that slopes forward from top to bottom. Both the first and second inclined surfaces 4121 and 4122 have second movement limiting grooves 4123, which extend through the upper and lower ends of the drive body 412 along the extending direction of the first and second inclined surfaces 4121 and 4122. The rear side of the front insert 42 has a third inclined surface 421 that adapts to the first inclined surface 4121, and the front side of the rear insert 43 has a fourth inclined surface 431 that adapts to the second inclined surface 4122. Both the third and fourth inclined surfaces 421 and 431 have second movement limiting parts 422 that can be movably inserted into the second movement limiting grooves 4123. With this structure, the front insert 42 can move backward and the rear insert 43 can move forward simultaneously when the drive body 412 moves upward.

[0083] It should be noted that the first movement limiting part 411 and the second movement limiting part 422 can be any of a T-shaped protrusion, a dovetail protrusion or an L-shaped protrusion.

[0084] More specifically, the bottom of the drive body 412 is provided with a first clearance slope 4124, which is inclined upward from left to right; the top of the bottom insert 44 is provided with a second clearance slope 441, which is inclined upward from left to right and has the same slope as the first clearance slope 4124; the bottom left side of the drive body 412 is provided with a first linkage protrusion 4125, and the top left side of the bottom insert 44 is provided with a first linkage groove 442, which can be inserted into the first linkage groove 442. The width of the left end of the bottom insert 44 in the front-to-back direction is smaller than the width of the right end of the bottom insert 44 in the front-to-back direction, making the bottom insert 44 have a structure that is smaller at the left end and larger at the right end; the front side of the bottom insert 44 is provided with a first extended slope 443 that adapts to the first slope 4121, and the rear side is provided with a second extended slope 444 that adapts to the second slope 4122.

[0085] Understandably, the bottom insert 44 is driven by the hydraulic cylinder 45 to move obliquely upward from left to right. In conjunction with the structure of the first avoidance slope 4124 and the second avoidance slope 441, the bottom insert 44 is demolded from left to right and obliquely upward, which can reduce the bottom insert 44 from scratching the plastic surface during the movement. After the bottom insert 44 moves to the right by the first oblique distance, the first linkage protrusion 4125 switches from the right end of the first linkage groove 442 to the left end of the first linkage groove 442. The bottom insert 44 has a first extending inclined surface 443 on its front side and a second extending inclined surface 444 on its rear side, and the bottom insert 44 as a whole has a structure that is smaller on the left and larger on the right. After the bottom insert 44 completes the displacement of the first inclined distance, there are gaps between the bottom insert 44 and the front insert 42 and the rear insert 43, respectively, so that the subsequent core-pulling drive block 41 can move the front insert 42 backward and the rear insert 43 forward to perform demolding operation with the L-shaped assembly groove. After the upper mold base 20 moves up the first vertical distance and the core-pulling drive block 41 moves the front insert 42 and the rear insert 43 to complete the demolding operation with the L-shaped assembly groove, the first linkage protrusion 4125 is still located in the first linkage groove 442, so that during the subsequent process of the bottom insert 44 moving to the right by the second inclined distance, the core-pulling moving block, the front insert 42 and the rear insert 43 can move to the right synchronously and exit the L-shaped assembly groove.

[0086] In other embodiments, the upper mold base 20 is provided with a glue injection port 23 and a runner plate 24 that connects to the glue injection port 23; the upper mold core 21 is provided with a glue injection nozzle 25, the top of the glue injection nozzle 25 can connect to the runner plate 24, and the bottom of the glue injection nozzle 25 can connect to the molding chamber 30; the lower mold base 10 is provided with an ejector plate 12, the top of the ejector plate 12 is provided with an ejector insert 121, the ejector insert 121 extends upward to the upper surface of the lower mold core 11, and the ejector insert 121 protrudes from the upper surface of the lower mold core 11 through the upward movement of the ejector plate 12.

[0087] It should be noted that after the upper mold base and the lower mold base are closed, the top of the injection nozzle is connected to the runner plate, and the bottom is connected to the molding cavity. After the upper mold base moves up a first vertical distance, the top of the injection nozzle is disconnected from the runner plate. After the upper mold base moves up a second vertical distance, the bottom of the injection nozzle is disconnected from the molding cavity.

[0088] Specifically, the upper mold base 20 and the upper mold core 21 are moved together by a linkage mechanism 50. When the upper mold base 20 moves upward by a first vertical distance, only the upper mold base 20 moves upward by itself; when the upper mold base 20 moves upward by a second vertical distance, the upper mold core 21 moves upward synchronously through the linkage mechanism 50. The linkage mechanism 50 includes a linkage fixing seat 51 fixedly mounted on the outer surface of the upper mold core 21, a first linkage rod 52 fixedly mounted on the upper mold base 20 and extending downward, and a second linkage rod 53 fixedly mounted on the outer surface of the upper mold core 21 and extending upward. The linkage fixing seat 51 has a linkage limiting hole 511 penetrating its upper and lower surfaces, and the linkage limiting hole 511 is provided with a linkage limiting shaft 512. The second linkage rod 53 is spaced apart from the first linkage rod 52 on the left side. The first linkage rod 52 has a first protrusion 521 on the left side, and the second linkage rod 53 has a first notch 531 on the right side. The diameter of the linkage limiting groove is larger than the diameter of the first notch 531 and is inserted into the first notch 531. After the upper mold base 20 and the lower mold base 10 are closed, the linkage limiting shaft 512 is set at a vertical distance from the first protrusion 521. Only when the upper mold base 20 moves up a second vertical distance, the first protrusion 521 abuts against the linkage limiting shaft 512 and moves the upper mold core 21 up in linkage.

[0089] It is understandable that the upper mold base moves up a second vertical distance by continuing to move upward based on the first vertical distance, and the bottom insert moves to the right a second diagonal distance by continuing to move diagonally to the right based on the first diagonal distance.

[0090] It should be noted that, in order to ensure the reliability of the vertical displacement of the upper mold base 20 and the lower mold base 10, as well as the reliability of the vertical displacement of the upper mold base 20 and the upper mold core 21, a structure that combines a guide rod and a guide hole between the upper mold base 20 and the lower mold base 10 can be provided to limit their vertical displacement, and a structure that combines a guide rod and a guide hole between the upper mold base 20 and the upper mold core 21 can also be provided to limit their vertical displacement. These are conventional design methods for those skilled in the art, and will not be described in detail here.

[0091] In some embodiments, the injection mold 100 for the automotive backup battery top shell is a double-cavity injection mold with two molding chambers 30 spaced apart, so that the upper mold base 20 and the lower mold base 10 can be molded into two battery top shells in one injection molding process.

[0092] This invention also provides an injection molding method for an automotive backup battery top cover. The injection molding method for the automotive backup battery top cover is applied to an injection mold 100 for the automotive backup battery top cover. The injection molding method includes...

[0093] Step 1: Provide an injection molding machine and install the injection mold 100 of the car spare battery top shell on the injection molding machine. The upper mold base 20, upper mold core 21 and ejector plate 12 are moved by the ejector mechanism of the injection molding machine.

[0094] Step 2: The telescopic rod 452 of the hydraulic cylinder 45 extends, driving the bottom insert 44 to move diagonally to the left, and in conjunction with the core-pulling drive block 41, the front insert 42 and the rear insert 43, they move to the left and reset synchronously.

[0095] Step 3: The ejector mechanism drives the upper mold base 20 and the lower mold core 11 to move down, so that the upper mold base 20 and the lower mold core 11 close together, and the upper mold core 21 and the lower mold core 11 can form a cavity 30.

[0096] Step 4: The hot melt slurry is injected from the injection port 23, the manifold plate 24 and the injection nozzle 25 into the molding chamber 30 through the extrusion system of the injection molding machine to injection mold the top shell 200 of the battery.

[0097] Step 5: The hydraulic cylinder 45 drives the bottom insert 44 to move to the right by the first oblique distance, so that the bottom insert 44 and the L-shaped assembly groove 2001 are demolded.

[0098] Step 6: The ejector mechanism drives the upper mold base 20 to move up a first vertical distance, so that the core pulling drive block 41 moves up a first vertical distance in sync and moves the front insert 42 backward and the rear insert 43 forward to demold from the L-shaped assembly slot 2001.

[0099] Step 7: The upper mold base 20 moves up a second vertical distance and moves up the upper mold core 21 in sync. At the same time, the hydraulic cylinder 45 drives the bottom insert 44 to move to the right a second oblique distance, so that the bottom insert 44 moves to the right in sync with the core pulling drive block 41, the front insert 42 and the rear insert 43 to exit the L-shaped assembly groove 2001 and the upper mold core 21 and the battery top shell 200 are demolded.

[0100] Step 8: The ejector mechanism drives the ejector plate 12 to move upward, so that the ejector insert 121 protrudes from the upper surface of the lower mold core 11 and ejects the battery top shell 200 from the lower mold core 11 for unloading.

[0101] Step 9: Repeat steps 2-8 to continue injection molding and unload the battery top shell 200.

[0102] The above are merely preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present invention.

Claims

1. An injection mold for the top cover of an automotive backup battery, comprising: The lower mold base (10) has a lower mold core (11) on the top. The upper mold base (20) has an upper mold core (21) that can move up and down at its bottom; when the upper mold base (20) moves down and closes with the lower mold base (10), the upper mold core (21) and the lower mold core (11) can enclose the molding cavity (30) for injection molding the battery top shell (200); and, A side mounting position (40) is provided, which extends into the molding chamber (30) to injection mold the L-shaped assembly groove (2001) of the battery top shell (200); characterized in that, The side slide (40) includes a core-pulling drive block (41) that can move left and right on the upper mold base (20), a front insert (42) that can move up and down on the front side of the core-pulling drive block (41), a rear insert (43) that can move up and down on the rear side of the core-pulling drive block (41), and a bottom insert (44) that can move diagonally left and right on the bottom of the core-pulling drive block (41). A hydraulic cylinder (45) is connected to the right side of the bottom insert (44). The upper mold core (21) has a mold core clearance notch (211) on the right side, which penetrates the upper surface and right side of the upper mold core (21). The upper mold core (21) has a sliding mounting cavity (212) that can connect the molding chamber (30) and the mold core clearance notch (211). The core-pulling drive block (41) includes a first movement limiting part (411) extending to the left and right and a drive body part (412) integrally formed at the bottom of the first movement limiting part (411) and extending downward to the slide mounting cavity (212); the top of the slide mounting cavity (212) is provided with a first movement limiting groove (2121) into which the first movement limiting part (411) can be movably inserted; the first movement limiting groove (2121) passes through the right side of the upper mold core (21) and connects to the mold core clearance notch (211); The front surface of the drive body is provided with a first inclined surface (4121) that slopes from top to bottom and backward, and the rear surface is provided with a second inclined surface (4122) that slopes from top to bottom and forward. Both the first inclined surface (4121) and the second inclined surface (4122) are provided with a second movement limiting groove (4123). The second movement limiting groove (4123) extends through the upper and lower ends of the drive body along the extension direction of the first inclined surface (4121) and the second inclined surface (4122). The rear side of the front insert (42) is provided with a third inclined surface (421) that is adapted to the first inclined surface (4121), and the front side of the rear insert (43) is provided with a fourth inclined surface (431) that is adapted to the second inclined surface (4122). Both the third inclined surface (421) and the fourth inclined surface (431) are provided with a second movement limiting part (422) that can be movably inserted into the second movement limiting groove (4123). The bottom of the drive body (412) is provided with a first clearance slope (4124), which is inclined upward from left to right; the top of the bottom insert (44) is provided with a second clearance slope (441), which is inclined upward from left to right and has the same slope as the first clearance slope (4124); the bottom left side of the drive body (412) is provided with a first linkage protrusion (4125), and the top left side of the bottom insert (44) is provided with a first linkage groove (442), which can be inserted into the first linkage groove (442).

2. The injection mold for the top shell of an automotive backup battery according to claim 1, characterized in that, The hydraulic cylinder (45) is fixedly mounted on the upper mold core (21) via the cylinder body fixing seat (451) and located on the right side of the mold core clearance notch (211). The telescopic rod (452) extends and retracts obliquely toward the mold core clearance notch (211). The telescopic rod (452) of the hydraulic cylinder (45) is fixedly mounted with a heat insulation block (453). The heat insulation block (453) has two mirror-shaped side sliding positions (40) arranged in front and behind.

3. The injection mold for the top shell of an automotive backup battery according to claim 2, characterized in that, The upper mold core (21) has a first abutment (213) at the bottom of the connection between the slide mounting cavity (212) and the mold core clearance notch (211). When the hydraulic cylinder (45) drives the bottom insert (44) to move to the left and abuts against the left side of the molding chamber (30), the first abutting part (213) abuts against the bottom right side of the bottom insert (44).

4. The injection mold for the top shell of an automotive backup battery according to claim 2 or 3, characterized in that, The mold core clearance notch (211) is provided with two stroke limit seats (214), and the two stroke limit seats (214) are spaced apart front and back. The heat insulation block (453) can slide diagonally left and right between the two stroke limit seats (214). The bottom of the upper mold base (20) is provided with a first pressure holding limiting block (22), and the heat insulation block (453) is provided with a first pressure holding limiting hole (4531) for the first pressure holding limiting block (22) to be inserted. When the hydraulic cylinder (45) drives the bottom insert (44) to move to the left and abuts against the left side of the molding chamber (30), the upper mold base (20) can move down and close the mold in conjunction with the upper mold core (21) and insert the first pressure holding limit block (22) into the first pressure holding limit hole (4531) to lock the side slide (40).

5. The injection mold for the top cover of an automotive backup battery according to claim 4, characterized in that, The width of the left end of the bottom inlay (44) in the front-to-back direction is smaller than the width of the right end of the bottom inlay (44) in the front-to-back direction, so that the bottom inlay (44) as a whole has a structure that is smaller on the left end and larger on the right end; The bottom insert (44) has a first extended inclined surface (443) adapted to the first inclined surface (4121) on the front side and a second extended inclined surface (444) adapted to the second inclined surface (4122) on the rear side.

6. The injection mold for the top cover of an automotive backup battery according to claim 5, characterized in that, The upper mold base (20) is provided with a glue injection port (23) and a runner plate (24) that connects to the glue injection port (23); the upper mold core (21) is provided with a glue injection nozzle (25), the top of the glue injection nozzle (25) can connect to the runner plate (24), and the bottom of the glue injection nozzle (25) can connect to the molding chamber (30). The lower mold base (10) is provided with an ejector plate, and the top of the ejector plate is provided with an ejector insert. The ejector insert extends upward to the upper surface of the lower mold core (11) and protrudes from the upper surface of the lower mold core (11) through the upward linkage of the ejector plate.

7. A method for injection molding a top shell of an automotive backup battery, applied to the injection mold (100) for the top shell of an automotive backup battery as described in any one of claims 1-6, characterized in that, Injection molding methods include Step 1: Provide an injection molding machine and install the injection mold (100) of the car spare battery top shell on the injection molding machine. The upper mold base (20), upper mold core (21) and ejector plate are moved by the ejector mechanism of the injection molding machine. Step 2: The telescopic rod (452) of the hydraulic cylinder (45) extends, driving the bottom insert (44) to move diagonally to the left, and simultaneously moving the core-pulling drive block (41), the front insert (42) and the rear insert (43) to the left to reset. Step 3: The ejector mechanism drives the upper mold base (20) and the lower mold core (11) to move down, so that the upper mold base (20) and the lower mold core (11) close together, and the upper mold core (21) and the lower mold core (11) can form a cavity (30). Step 4: The hot melt slurry is injected from the injection port (23), the manifold plate (24) and the injection nozzle (25) into the molding chamber (30) to injection mold the top shell (200) of the battery through the extrusion system of the injection molding machine. Step 5: The hydraulic cylinder (45) drives the bottom insert (44) to move to the right by the first oblique distance, so that the bottom insert (44) and the L-shaped assembly groove (2001) are demolded. Step 6: The ejector mechanism drives the upper mold base (20) to move up a first vertical distance, so that the core pulling drive block (41) moves up a first vertical distance in sync and moves the front insert (42) backward and the rear insert (43) forward to demold from the L-shaped assembly slot (2001); Step 7: The upper mold base (20) moves up a second vertical distance and moves up synchronously with the upper mold core (21). At the same time, the hydraulic cylinder (45) drives the bottom insert (44) to move to the right a second oblique distance, so that the bottom insert (44) moves to the right in conjunction with the core pulling drive block (41), the front insert (42) and the rear insert (43) to exit the L-shaped assembly groove (2001) and the upper mold core (21) and the battery top shell (200) are demolded. Step 8: The ejector mechanism drives the ejector plate to move up, so that the ejector insert protrudes from the upper surface of the lower mold core (11) and ejects the battery top shell (200) from the lower mold core (11) for discharge; Step 9: Repeat steps 2-8 to continue injection molding and unload the battery top shell (200).

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