Injection mold for an oil pan

Abstract

The application relates to an injection mold for an oil filter base and belongs to the technical field of injection molds. The injection mold comprises a top plate, a fixed mold plate, a movable mold plate and a foot plate arranged in sequence, a forming cavity is arranged at the joint of the fixed mold plate and the movable mold plate, a first sliding seat, a mounting seat and a motor are arranged at the top of the movable mold plate, a sliding block and a connecting block in sliding connection are arranged in the mounting seat, a forming block fixedly arranged on the first sliding seat is arranged on the outer side wall of the forming block, a rotatable sleeve is arranged on the outer side wall of the forming block, and an external thread is arranged on the outer side wall of the sleeve at one end of the forming cavity. In the scheme, the spring pushes the sliding block and the connecting block to move outward, thereby providing a space for the sleeve to move outward, the motor drives the sleeve to rotate through a connecting mechanism, the sleeve can rotate and move outward, the external thread on the outer wall of the sleeve is separated from the product in the forming cavity, an internal thread for mounting a filter element can be directly formed on the formed oil filter base, and the oil filter base does not need to be secondarily processed, thereby improving the production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of injection mold technology and relates to an injection mold for an oil filter base. Background Technology

[0002] An oil filter holder, also known as an oil filter housing, is a common automotive accessory. Its main functions are: securing the filter element, sealing the oil passages, regulating oil pressure, and integrating heat dissipation to ensure clean, stable, and appropriately sized engine oil. Because oil filter holders can be made of high-temperature resistant engineering plastics, injection molding can be used to produce the outer shell. The plastic raw material is heated to a molten state and then injected into a pre-designed molding cavity. Once the cavity is full, the mold is rapidly cooled, causing the molten plastic to solidify and form the desired plastic part. Using injection molding to produce oil filter holders offers advantages such as high precision and high efficiency.

[0003] However, existing injection molds used for producing oil filter bases still have some shortcomings. Since an oil filter element needs to be installed inside the oil filter base to filter engine oil, a filter element mounting tube needs to be provided on the base, and this tube also needs to have threads to facilitate the installation of the filter element. However, directly creating threads inside the molding cavity makes demolding this complex product difficult. Therefore, existing technologies typically employ a two-stage processing method: first producing the oil filter base and filter element mounting tube, then demolding and machining the threaded structure. This method reduces production efficiency and increases production costs. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by proposing an injection mold for an oil filter base. The technical problem to be solved by this invention is: how to directly form a structure for installing the filter element on the oil filter base during the injection molding process.

[0005] The objective of this invention can be achieved through the following technical solution: An injection mold for an oil filter base includes a top plate, a fixed template, a moving template, and a foot plate arranged sequentially. A molding cavity is provided at the connection between the fixed template and the moving template. A first slide block is slidably connected to the top of the fixed template. A motor is fixedly connected to the first slide block on one side away from the molding cavity, and a mounting base is fixedly connected to the other side. A rotating shaft connected to the motor is located inside the mounting base. A first gear is fixedly connected to the rotating shaft. A molding block is fixedly connected to the first slide block. A rotatable sleeve is provided on the outer wall of the molding block. One end of the molding block and the sleeve extends into the molding cavity. An external thread is provided on the outer wall of the sleeve at the end inserted into the molding cavity. A slidably connected and keyed second gear is provided on the outer wall of the other end of the sleeve. The second gear meshes with the first gear. A sliding slider and a connecting block are slidably connected inside the mounting base. A connecting block is located near the molding cavity and is fixedly connected to the slider. The slider and the connecting block are respectively abutted on both sides of the second gear. A spring is provided inside the slider and the connecting block. One end of the spring abuts against the inner wall of the slider, and the other end abuts against the inner wall of the mounting base. A reset block is provided at the bottom of the fixed template to push the slider to move closer to the molding cavity. An opening is provided at the top of the mounting base to accommodate the insertion of the reset block. A guide slope is provided on the side of the reset block near the slider. The guide slope abuts against the side wall of the slider. The reset block has a structure that is narrow at the bottom and wide at the top. A hydraulic cylinder is fixedly connected inside the moving template. A retractable piston rod is provided at the end of the hydraulic cylinder away from the molding cavity. The piston rod is fixedly connected to the bottom of the first slide. A molding rod is fixedly connected at the end of the molding block near the molding cavity. A recessed molding groove is provided at the connection between the molding block and the molding rod. The molding groove is connected to the molding cavity.

[0006] In this design, molten plastic heated to a molten state is injected into the molding cavity. The molten plastic cools and solidifies within the cavity. Since one end of the molding block and sleeve extends into the cavity, the molten plastic coats the outer walls of the molding block and sleeve, forming a structure corresponding to their outer walls. During demolding, the moving mold plate moves and separates from the fixed mold plate. The reset block no longer presses against the slider. Driven by a spring, the slider and connecting block move away from the molding cavity. The slider and connecting block drive the inner second gear outward, providing space for the sleeve to move outward. Then, the motor drives the rotating shaft to rotate, which in turn drives the first gear on the outer wall to rotate synchronously. The first gear drives the meshing second gear to rotate, and the second gear drives the inner keyway... The sleeve rotates, causing the external thread on the sleeve to be pulled out laterally from the molding cavity, facilitating the subsequent longitudinal ejection of the molded product. During the mold closing process of the fixed and moving mold plates, the reset block is inserted from the opening at the top of the mounting base. Through the guide ramp, it pushes the slider, causing the slider and connecting block to move towards the side closer to the molding cavity. The connecting block also pushes the sleeve into the molding cavity, allowing the sleeve to reset as well. After the molten plastic is injected back into the molding cavity, the external thread on the sleeve is pulled out from the molding cavity. The hydraulic cylinder drives the piston rod to push out, and the piston rod pushes the fixed first slide block away from the molding cavity, completely removing the sleeve and molding block from the molding cavity. This allows the molding rod to insert deeper into the molding cavity, forming a flow channel structure inside the molded oil filter base. Through this method… The spring pushes the slider and connecting block to move outward, providing space for the sleeve to move outward. The motor drives the sleeve to rotate through the connecting mechanism, and the sleeve can rotate and move outward, so that the external thread on the outer wall separates from the product in the forming cavity. The formed oil filter base can directly form the internal thread for installing the filter element, eliminating the need for secondary processing of the oil filter base and improving production efficiency.

[0007] In the injection mold of the oil filter base described above, the sleeve is cylindrical in shape. A sliding plane is provided on the outer wall of the end of the sleeve where the second gear is mounted. The interior of the second gear fits against the outer wall and sliding plane of the sleeve. The width of the first gear is greater than the width of the second gear. After the moving mold plate separates from the fixed mold plate, the second gear moves away from the molding cavity under the push of the slider and connecting block. The second gear can move on the sliding plane, and during its rotation, it can transmit torque to the sleeve, causing the sleeve to rotate and pull the core.

[0008] In the injection mold of the oil filter base described above, the molding cavity contains a cooled and formed shell. One end of the shell has a filter element mounting tube, which is formed around the outer wall of the sleeve. The inner wall of the filter element mounting tube has internal threads. The shell of the oil filter base is cooled and formed in the molding cavity. The end of the shell that wraps around the outside of the sleeve forms a filter element mounting tube for mounting the filter element, and the filter element mounting tube can be formed with internal threads, allowing the oil filter element to be rotatably installed inside the filter element mounting tube.

[0009] In the injection mold of the oil filter base described above, the top of the fixed mold plate is provided with a second slide and a third slide that are slidably connected. The second slide and the third slide are respectively located on both sides of the molding cavity. The side of the second slide and the third slide closest to the molding cavity is provided with a molding part, which can be slidably inserted into the molding cavity. The molding part on the second slide and the third slide can be inserted into the molding cavity, so that holes can be formed on both sides of the housing, allowing engine oil to flow in.

[0010] In the injection mold for the oil filter base described above, the tops of the second and third slides are provided with inclined guide holes, the tops of which are tilted towards the side closer to the molding cavity. The bottom of the fixed mold plate is provided with an inclined guide post, which can slide into the inclined guide hole. When the moving mold plate separates from the fixed mold plate, the inclined guide post can push the second and third slides to move away from the molding cavity, causing the molding part to be pulled out of the molding cavity.

[0011] In the injection mold of the aforementioned oil filter base, the top plate is provided with a feed port, and a hot runner plate connected to the feed port is provided inside the top plate. A nozzle is connected to the bottom of the hot runner plate, and the bottom of the nozzle passes through the fixed mold plate and connects to the molding cavity. After the plastic raw material is heated to a molten state, it is injected through the feed port, and after being diverted by the hot runner plate, it is injected into the molding cavity through the nozzle.

[0012] In the injection mold of the oil filter base described above, the foot plate is provided with a slidingly connected push plate, and the push plate is provided with a fixed ejector pin. The top of the ejector pin passes through the moving mold plate and extends to the bottom of the molding cavity. After the hydraulic cylinder pushes the first slide block outward, it pushes the push plate towards the side closer to the moving mold plate, causing the ejector pin to be ejected from the bottom of the molding cavity, thus pushing the product to demold.

[0013] Compared with the prior art, the present invention has the following advantages: In this solution, the spring pushes the slider and connecting block to move outward, providing space for the sleeve to move outward. The motor drives the sleeve to rotate through the connecting mechanism, and the sleeve can rotate outward, so that the external thread on the outer wall of the sleeve separates from the product in the forming cavity. The formed oil filter base can directly form the internal thread for installing the filter element, eliminating the need for secondary processing of the oil filter base and improving production efficiency. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the oblique section structure at the motor of the present invention; Figure 3 yes Figure 2 A magnified schematic diagram of the local structure; Figure 4 This is a schematic diagram of the connection structure between the first gear and the second gear of the present invention; Figure 5 This is a schematic diagram of the internal open state structure of the moving template of the present invention; Figure 6 This is a schematic diagram of the invention from a bottom view (half-section). Figure 7 This is a schematic diagram of the three-dimensional structure of the shell of the present invention.

[0015] In the diagram, 1. Top plate; 1a. Feed inlet; 1b. Hot runner plate; 1c. Nozzle; 2. Fixed template; 2a. Reset block; 2a1. Guide slope; 2b. Inclined guide post; 3. Moving template; 3a. Second slide; 3b. Third slide; 3c. Forming part; 3d. Inclined guide hole; 4. Foot plate; 4a. Push plate; 4b. Ejector pin; 5. Forming cavity; 6. First slide; 6a. Motor; 6b. Mounting base; 6b1. Rotating shaft; 6b2. First gear; 6b3. Slider; 6b4. Connecting block; 6b5. Spring; 6b6. Opening; 6c. Cylinder; 6c1. Piston rod; 7. Forming block; 7a. Sleeve; 7a1. External thread; 7a2. Sliding plane; 7b. Second gear; 7c. Forming rod; 7d. Forming groove; 8. Housing; 8a. Filter element mounting tube; 8a1. Internal thread. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments. Example

[0017] like Figure 1 As shown, the injection mold for the oil filter base includes a top plate 1, a fixed template 2 fixedly connected to the bottom of the top plate 1, a movable template 3 fixedly connected to the bottom of the fixed template 2, a foot plate 4 fixedly connected to the bottom of the movable template 3, a feed port 1a on the top plate 1, and a slidingly connected push plate 4a inside the foot plate 4.

[0018] like Figure 2As shown, a forming cavity 5 is provided at the connection between the fixed template 2 and the moving template 3. A first slide block 6 is provided on the top of the fixed template 2. A motor 6a is fixedly connected on the side of the first slide block 6 away from the forming cavity 5, and a mounting seat 6b is fixedly connected on the other side. A rotating shaft 6b1 connected to the motor 6a is provided inside the mounting seat 6b. A hydraulic cylinder 6c is fixedly connected inside the moving template 3. A telescopic piston rod 6c1 is provided at the end of the hydraulic cylinder 6c away from the forming cavity 5. The piston rod 6c1 is fixedly connected to the bottom of the first slide block 6. A ejector pin 4b is fixedly connected on the push plate 4a. The top of the ejector pin 4b passes through the moving template 3 and extends to the bottom of the forming cavity 5.

[0019] like Figure 3 As shown, a first gear 6b2 is fixedly connected to the rotating shaft 6b1, and a forming block 7 is fixedly connected to the first slide block 6. A rotatable sleeve 7a is provided on the outer wall of the forming block 7. One end of the forming block 7 and the sleeve 7a extends into the forming cavity 5. The outer wall of the sleeve 7a at the end inserted into the forming cavity 5 is provided with an external thread 7a1. The outer wall of the other end of the sleeve 7a is provided with a sliding plane 7a2. A second gear 7b is slidably and keyedly connected to the sliding plane 7a2. The second gear 7b meshes with the first gear 6b2. The width of 6b2 is greater than the width of the second gear 7b. The mounting base 6b is provided with a sliding block 6b3 and a connecting block 6b4 inside. The connecting block 6b4 is located on the side near the forming cavity 5 and is fixedly connected to the sliding block 6b3. The sliding block 6b3 and the connecting block 6b4 are respectively abutted on both sides of the second gear 7b. The bottom of the fixed template 2 is provided with a reset block 2a. The side of the reset block 2a near the sliding block 6b3 is provided with a guide slope 2a1. The guide slope 2a1 abuts against the side wall of the sliding block 6b3. The reset block 2a has a structure that is narrow at the bottom and wide at the top.

[0020] like Figure 4 As shown, a spring 6b5 is provided inside the slider 6b3 and the connecting block 6b4. One end of the spring 6b5 abuts against the inner wall of the slider 6b3, and the other end abuts against the inner wall of the mounting base 6b. A forming rod 7c is fixedly connected to one end of the forming block 7 near the forming cavity 5. A recessed forming groove 7d is provided at the connection between the forming block 7 and the forming rod 7c. The forming groove 7d is connected to the forming cavity 5.

[0021] like Figure 5As shown, the top of the fixed template 2 is provided with a second slide block 3a and a third slide block 3b that are slidably connected. The second slide block 3a and the third slide block 3b are respectively provided on both sides of the molding cavity 5. The side of the second slide block 3a and the third slide block 3b near the molding cavity 5 is provided with a molding part 3c. The molding part 3c can be slidably inserted into the molding cavity 5. The top of the second slide block 3a and the third slide block 3b is provided with an inclined guide hole 3d. The top of the inclined guide hole 3d is inclined towards the side near the molding cavity 5. The top of the mounting base 6b is provided with an opening 6b6 that can accommodate the insertion of the reset block 2a.

[0022] like Figure 6 As shown, the bottom of the fixed template 2 is provided with a fixed inclined guide post 2b, which can be slidably inserted into the inclined guide hole 3d. The top plate 1 is provided with a hot runner plate 1b connected to the feed port 1a. The bottom of the hot runner plate 1b is provided with a connected nozzle 1c, and the bottom of the nozzle 1c passes through the fixed template 2 and is connected to the molding cavity 5.

[0023] like Figure 7 As shown, the molding cavity 5 is provided with a cooled and formed shell 8. One end of the shell 8 is provided with a filter element installation tube 8a. The filter element installation tube 8a is formed on the outer wall of the sleeve 7a. The inner wall of the filter element installation tube 8a is provided with an internal thread 8a1.

[0024] The working principle of this solution is as follows: Figure 1-7 As shown, after the plastic raw material is heated to a molten state, it is injected into the feed port 1a. After being diverted by the hot runner plate 1b, it is injected into the molding cavity 5 through the nozzle 1c. The molten plastic cools in the molding cavity 5 to form the housing 8 of the oil filter base. Since one end of the molding block 7 and the sleeve 7a extends into the molding cavity 5, the molten plastic can wrap around the outer wall of the molding block 7 and the sleeve 7a, so that the filter element installation tube 8a can be integrally connected on the housing 8. Furthermore, the inner wall of the filter element installation tube 8a can be formed with an internal thread 8a1 corresponding to the external thread 7a1. No further secondary processing of the housing 8 is required, which improves production efficiency.

[0025] During the demolding process, the moving template 3 moves and separates from the fixed template 2. The reset block 2a no longer presses against the slider 6b3. Under the push of the spring 6b5, the slider 6b3 and the connecting block 6b4 move away from the molding cavity 5. The slider 6b3 and the connecting block 6b4 drive the inner second gear 7b to move outward, providing space for the sleeve 7a to move outward. Then, the motor 6a drives the rotating shaft 6b1 to rotate. The rotating shaft 6b1 drives the first gear 6b2 on the outer wall to rotate synchronously. b2 drives the meshing second gear 7b to rotate, and the second gear 7b drives the inner key-connected sleeve 7a to rotate, so that the external thread 7a1 on the sleeve 7a is pulled out laterally from the molding cavity 5. Then, the piston rod 6c1 is pushed out by the oil cylinder 6c. The piston rod 6c1 pushes the fixed first slide 6 to move away from the molding cavity 5, so that the sleeve 7a, molding block 7 and molding rod 7c are completely pulled out from the molding cavity 5, so that the ejector pin 4b can be ejected vertically from the housing 8, avoiding interference during the demolding process.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0027] Although this article uses the following terms extensively: 1. Top plate; 1a. Feed inlet; 1b. Hot runner plate; 1c. Nozzle; 2. Fixed template; 2a. Reset block; 2a1. Guide slope; 2b. Angled guide post; 3. Moving template; 3a. Second slide; 3b. Third slide; 3c. Molding part; 3d. Angled guide hole; 4. Foot plate; 4a. Push plate; 4b. Ejector pin; 5. Molding cavity; 6. First slide; 6a. Motor; 6b. Mounting base; 6b1 The terms used include: 6b1, pivot; 6b2, first gear; 6b3, slider; 6b4, connecting block; 6b5, spring; 6b6, opening; 6c, cylinder; 6c1, piston rod; 7, forming block; 7a, sleeve; 7a1, external thread; 7a2, sliding plane; 7b, second gear; 7c, forming rod; 7d, forming groove; 8, housing; 8a, filter element mounting tube; 8a1, internal thread, etc., but the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would be contrary to the spirit of the invention.

Claims

1. An injection mold for an oil filter base, comprising a top plate (1), a fixed template (2), a movable template (3), and a foot plate (4) arranged sequentially, wherein a molding cavity (5) is provided at the connection between the fixed template (2) and the movable template (3), characterized in that, The top of the fixed template (2) is provided with a first slide block (6) that is slidably connected. The first slide block (6) has a motor (6a) fixedly connected on one side away from the molding cavity (5), and a mounting seat (6b) fixedly connected on the other side. The mounting seat (6b) has a rotating shaft (6b1) connected to the motor (6a) inside. The rotating shaft (6b1) has a first gear (6b2) fixedly connected on it. The first slide block (6) has a molding block (7) fixedly connected on it. The outer wall of the molding block (7) has a rotatable sleeve (7a). One end of the molding block (7) and the sleeve (7a) extends into the molding cavity. Inside the cavity (5), the sleeve (7a) is provided with an external thread (7a1) on the outer wall of one end into the molding cavity (5), and a second gear (7b) is provided on the outer wall of the other end of the sleeve (7a) that is slidable and keyed. The second gear (7b) meshes with the first gear (6b2). The mounting base (6b) is provided with a slider (6b3) and a connecting block (6b4) that are slidably connected inside. The connecting block (6b4) is located on the side close to the molding cavity (5) and is fixedly connected to the slider (6b3). The slider (6b3) and the connecting block (6b4) are respectively abutted against the second gear. On both sides of (7b), the slider (6b3) and the connecting block (6b4) are provided with springs (6b5). One end of the spring (6b5) abuts against the inner wall of the slider (6b3), and the other end abuts against the inner wall of the mounting base (6b). The bottom of the fixed template (2) is provided with a reset block (2a) to push the slider (6b3) to move closer to the molding cavity (5). The top of the mounting base (6b) is provided with an opening (6b6) that can accommodate the insertion of the reset block (2a). The reset block (2a) is provided with a guide slope (2a1) on the side near the slider (6b3). 1) The reset block (2a) abuts against the side wall of the slider (6b3). The reset block (2a) has a structure that is narrow at the bottom and wide at the top. The moving template (3) is equipped with a fixed oil cylinder (6c). The oil cylinder (6c) is equipped with a retractable piston rod (6c1) at the end away from the molding cavity (5). The piston rod (6c1) is fixedly connected to the bottom of the first slide (6). The molding block (7) is equipped with a fixed molding rod (7c) at the end near the molding cavity (5). The molding block (7) is equipped with an inwardly recessed molding groove (7d) at the connection between the molding block (7) and the molding rod (7c). The molding groove (7d) is connected to the molding cavity (5).

2. The injection mold for an oil filter base according to claim 1, characterized in that, The sleeve (7a) is cylindrical in shape. A sliding plane (7a2) is provided on the outer wall of the end of the sleeve (7a) where the second gear (7b) is installed. The interior of the second gear (7b) fits into the outer wall of the sleeve (7a) and the sliding plane (7a2). The width of the first gear (6b2) is greater than the width of the second gear (7b).

3. The injection mold for an oil filter base according to claim 1, characterized in that, The molding cavity (5) is provided with a cooled and formed shell (8). One end of the shell (8) is provided with a filter element installation tube (8a). The filter element installation tube (8a) is formed on the outer wall of the sleeve (7a). The inner wall of the filter element installation tube (8a) is provided with an internal thread (8a1).

4. The injection mold for an oil filter base according to claim 1, characterized in that, The top of the fixed template (2) is provided with a second slide (3a) and a third slide (3b) that are slidably connected. The second slide (3a) and the third slide (3b) are respectively located on both sides of the molding cavity (5). The second slide (3a) and the third slide (3b) are provided with a molding part (3c) on the side of the molding cavity (5) that is close to the molding cavity (5). The molding part (3c) can be slidably inserted into the molding cavity (5).

5. The injection mold for an oil filter base according to claim 4, characterized in that, The second slide (3a) and the third slide (3b) are provided with inclined guide holes (3d) at their tops. The top of the inclined guide holes (3d) is inclined toward the side close to the forming cavity (5). The bottom of the fixed template (2) is provided with an inclined guide post (2b) that is fixedly connected. The inclined guide post (2b) can be slidably inserted into the inclined guide hole (3d).

6. The injection mold for an oil filter base according to claim 1, characterized in that, The top plate (1) is provided with a feed inlet (1a), and the top plate (1) is provided with a hot runner plate (1b) connected to the feed inlet (1a). The bottom of the hot runner plate (1b) is provided with a nozzle (1c) connected to it. The bottom of the nozzle (1c) passes through the fixed template (2) and is connected to the molding cavity (5).

7. The injection mold for an oil filter base according to claim 1, characterized in that, The foot plate (4) is provided with a sliding push plate (4a) inside, and a fixed ejector pin (4b) is provided on the push plate (4a). The top of the ejector pin (4b) passes through the moving template (3) and extends to the bottom of the molding cavity (5).

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