A bicycle hub forming die facilitating replacement of a plunger and a method of replacing the plunger

Abstract

The present application relates to the field of bicycle hub production, especially to a bicycle hub forming die convenient for replacing ejector pins and a replacement method thereof, which comprises an upper die and a lower die, a forming cavity is formed between the upper die and the lower die, an ejector mechanism is movably arranged on one side of the lower die and penetrates into the forming cavity, a limiting mechanism for limiting the ejector mechanism is arranged on one side of the lower die, and the application further comprises the following replacement steps: firstly, separating the fixed assembly from the side blocking assembly and the ejector mechanism; then, rotating the fixed assembly and taking out the entire ejector mechanism from the side wall of the lower die; then, reinstalling a new ejector mechanism to the side wall of the lower die; finally, rotating the fixed assembly and connecting it with the side blocking assembly, and the replacement is completed. The present application can facilitate the replacement and repair of the ejector pins, so as to improve the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of bicycle wheel hub manufacturing, and in particular to a bicycle wheel hub forming mold and a method for replacing the ejector pin, which facilitates the replacement of the ejector pin. Background Technology

[0002] Bicycles are widely used as a means of transportation in people's daily lives, and have many advantages such as environmental protection and emission reduction, ease of use and green environmental protection.

[0003] Current one-piece bicycle wheels are mainly cast from a single mold. The hub axle and hub are connected by multiple spokes, resulting in a simple structure, low cost, and good forming effect. When using a mold to form the hub, molten material is first injected into the hub cavity along the sprue of the upper mold. Under the action of the upper and lower molds, the hub is formed within the cavity. Then, the upper and lower molds separate, and an ejector mechanism located at the lower mold ejects the exposed hub, achieving rapid unloading of the formed hub.

[0004] Because the existing integrated bicycle wheel hub has a heavy structure, using ejector pins in the ejection mechanism to eject the molded integrated bicycle wheel hub is prone to pin breakage and wear, or ejection imbalance. Therefore, it is necessary to frequently replace ejector pins to repair and ensure the material output efficiency of the molded hub, resulting in low production efficiency. Summary of the Invention

[0005] In order to facilitate the replacement and repair of ejector pins and improve production efficiency, this application provides a bicycle wheel hub forming mold and a replacement method thereof that facilitates ejector pin replacement.

[0006] The bicycle wheel hub forming mold provided in this application, which facilitates ejector pin replacement, adopts the following technical solution: A bicycle wheel hub forming mold that facilitates ejector pin replacement includes an upper mold and a lower mold, with a cavity formed between the upper mold and the lower mold. An ejector mechanism that penetrates into the cavity is movably disposed on one side of the lower mold, and a limiting mechanism for restricting the ejector mechanism is disposed on one side of the lower mold.

[0007] By adopting the above technical solution, during installation, the ejector mechanism can be stably installed on the side wall of the lower mold away from the upper mold under the action of the limiting mechanism. This allows the ejector mechanism to stably eject the bicycle wheel hub formed inside the cavity, thereby increasing the service life of the ejector mechanism per cycle. When the ejector mechanism needs to be replaced, the limiting mechanism can be directly separated from the ejector mechanism, allowing the ejector mechanism to break free from the limiting mechanism's limiting effect. This facilitates the subsequent quick removal and replacement of the ejector mechanism from the lower mold, thereby improving the replacement efficiency of the ejector mechanism and effectively increasing the efficiency of the enterprise in producing wheel hubs.

[0008] Preferably, the limiting mechanism includes a side stop assembly and a quick-release assembly. The side stop assembly is disposed on the lower mold and located on the side wall of the ejection mechanism. The quick-release assembly is movably disposed on the side wall of the side stop assembly and abuts against one side of the ejection mechanism.

[0009] By adopting the above technical solution, the ejector mechanism is installed between the side guard components, and the ejector mechanism is limited and fixed by the quick-release component, so that the ejector mechanism can stably eject the formed wheel hub in the cavity. In addition, when the ejector mechanism needs to be replaced, it can be quickly removed by directly removing the quick-release component from the side guard component, thereby effectively improving the production efficiency of bicycle wheel hubs.

[0010] Preferably, the side block assembly includes a pad and a mounting block. The pad is disposed on the outside of the lower mold and abuts against the side wall of the ejection mechanism. The mounting block is disposed on the side wall of the pad and connected to the quick-release assembly.

[0011] Preferably, the quick-release assembly includes a positioning block and a positioning strip. The positioning block is movably disposed on the side wall of the side guard assembly via the positioning strip, and the positioning block is connected to the side wall of the ejection mechanism.

[0012] By adopting the above technical solution, during installation, the ejector mechanism is installed between the pads, and the positioning strip is connected to the mounting block. This allows the ejector mechanism to be stably installed on the side wall of the lower mold under the interaction of the positioning block, the positioning strip, and the pad, thereby enhancing the stability of the ejector mechanism. At the same time, the ejector mechanism can be quickly disassembled and replaced by removing the positioning block and the positioning strip, thus effectively improving the company's production efficiency for bicycle wheel hub molding.

[0013] Preferably, the limiting mechanism includes a side stop assembly and a fixing assembly. The side stop assembly is movably disposed on the lower mold and connected to the side wall of the ejection mechanism, and the fixing assembly is movably disposed on the side wall of the side stop assembly and connected to the side wall of the ejection mechanism.

[0014] By adopting the above technical solution, the side blocking assembly can block and limit the two sides of the ejection mechanism, while the fixing assembly can limit and fix the outer side of the ejection mechanism, so that the ejection mechanism can stably perform ejection work under the combined action of the side blocking assembly and the fixing assembly, thereby improving the single service life of the ejection mechanism.

[0015] Preferably, the side block assembly includes a pad and a connector. The pad is disposed on the outside of the lower mold and abuts against the side wall of the ejection mechanism. The connector is movably disposed on the side wall of the pad and is inserted into the ejection mechanism.

[0016] Preferably, the fixing component includes a rotating component and a stabilizing component, wherein the stabilizing component is movably disposed on the side wall of the pad block via the rotating component.

[0017] By adopting the above technical solution, the pad block can abut and limit the two side walls of the ejection mechanism, and the connecting part can further improve the working stability of the ejection mechanism by sliding and inserting with the ejection mechanism. The stabilizing part can be connected with the ejection mechanism to better limit the installation position of the ejection mechanism, effectively increasing the service life of the ejection mechanism. The rotating part facilitates the overall rotation of the stabilizing part, thereby facilitating the faster disassembly and replacement of the ejection mechanism.

[0018] Preferably, the stabilizing member extends through the inside of the ejection mechanism and is connected to the connecting member.

[0019] By adopting the above technical solution, the connection between the fixed component and the side block component can be made more stable, thereby improving the working stability of the ejection mechanism.

[0020] Preferably, the side wall of the upper mold is provided with an auxiliary feeding mechanism, the output end of which extends into the upper mold and is used to separate the formed hub from the waste material.

[0021] By adopting the above technical solution, the auxiliary feeding mechanism can cut and separate the material cake in the flow channel of the formed bicycle wheel hub in the cavity, thereby reducing the weight of the formed bicycle wheel hub and making it easier for the ejector pin to eject the formed bicycle wheel hub from the lower mold more quickly, thereby further and effectively improving the service life of the ejector pin.

[0022] On the other hand, the ejector pin replacement method for the bicycle wheel hub forming mold provided in this application includes the following steps: Step 1: Separate the fixing component from the side guard component and the ejection mechanism; Step 2: After rotating the fixed component, remove the entire ejection mechanism from the side wall of the lower mold; Step 3: Reinstall the new ejection mechanism onto the side wall of the lower mold, then rotate the fixing component and connect it to the side stop component to complete the replacement.

[0023] By adopting the above technical solution, the ejector mechanism can be replaced more conveniently, thereby saving the time cost of replacing the ejector pin each time, and thus effectively improving the efficiency of bicycle wheel hub forming production. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the bicycle wheel hub forming mold according to Embodiment 1 of this application; Figure 2 This is a cross-sectional view of the bicycle wheel hub forming mold according to Embodiment 1 of this application; Figure 3 This is a schematic diagram of the auxiliary feeding mechanism in Embodiment 1 of this application. Figure 4 This is a schematic diagram of the overall structure of the bicycle wheel hub forming mold according to Embodiment 2 of this application; Figure 5 This is a partial structural schematic diagram of the bicycle wheel hub forming mold according to Embodiment 2 of this application; Figure 6 yes Figure 5 Enlarged view of section A; Figure 7 This is a structural schematic diagram of the ejector base plate, side baffle assembly, and fixing assembly in Embodiment 2 of this application; Figure 8 yes Figure 7 Enlarged view of section B.

[0025] Explanation of reference numerals in the attached figures: 1. Upper mold; 2. Lower mold; 3. Cavity; 4. Ejection mechanism; 41. Ejector pin; 42. Ejector sleeve; 43. Ejector fixing plate; 44. Ejector base plate; 441. Mating groove; 442. Connecting groove; 5. Limiting mechanism; 51. Side guard assembly; 511. Pad block; 512. Mounting block; 513. Connecting piece; 514. Groove; 515. Linkage spring; 516. Linkage block; 517. Extension spring; 518. Extension protrusion; 519. Clearance hole; 52. Quick release assembly; 521. Positioning block; 522. Positioning strip; 53. Fixing assembly; 531. Rotating part; 532. Stabilizing part; 533. Clamping block; 534. Screw block; 535. Connecting strip; 536. Connecting spring; 6. Auxiliary feeding mechanism; 61. Slitting cylinder; 62. Cutting blade. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0027] Example 1: Embodiment 1 of this application discloses a bicycle wheel hub forming mold that facilitates ejector pin replacement, referring to... Figure 1 and 2 The system includes an upper mold 1 and a lower mold 2 that cooperates with the upper mold 1. The upper mold 1 has a gate and a runner inside, and a cavity 3 that communicates with the runner is formed between the upper mold 1 and the lower mold 2. At the same time, in order to facilitate the removal of the molded wheel hub from the cavity 3, an ejection mechanism 4 is detachably installed on the side of the lower mold 2 away from the upper mold 1.

[0028] In this embodiment, the ejection mechanism 4 includes ejector pins 41, ejector sleeves 42, ejection fixing plates 43, and ejection base plates 44. Multiple ejector pins 41 are provided, all penetrating the interior of the lower mold 2. The ejection fixing plates 43 and ejection base plates 44 are sequentially installed on the side of the lower mold 2 away from the upper mold 1. The ejector sleeves 42 are disposed on the ejection fixing plates 43 and penetrate the cavity 3.

[0029] During operation, the upper mold 1 and the lower mold 2 are closed, and the raw material is introduced from the gate and enters the cavity 3 through the runner to form. Then, the upper mold 1 and the lower mold 2 are opened and separated, and the formed bicycle wheel hub is ejected and demolded by the cooperation of the ejector sleeve 42 and multiple ejector pins 41 in the ejection mechanism 4.

[0030] Reference Figure 1 and 2 To improve the overall operational stability of the ejection mechanism 4, a limiting mechanism 5 is provided on the side of the lower mold 2 away from the upper mold 1. In this embodiment, the limiting mechanism 5 includes a side baffle assembly 51 and a quick-release assembly 52. ​​The side baffle assembly 51 is installed on one side of the lower mold 2 and abuts against the ejection fixing plate 43 and the ejection base plate 44, while the quick-release assembly 52 is detachably installed on one side of the side baffle assembly 51 and abuts against the side of the ejection base plate 44 away from the ejection fixing plate 43.

[0031] In this embodiment, the side baffle assembly 51 includes pad blocks 511 and mounting blocks 512. Two pad blocks 511 are provided, and are bolted to the side wall of the lower mold 2. Each pad block 511 abuts against the opposite sides of the ejector fixing plate 43 and the ejector base plate 44. Multiple mounting blocks 512 are provided, symmetrically positioned on the outer wall of the side where two pad blocks 511 are close to each other. An embedding groove is formed on the side of each mounting block 512 away from the pad blocks 511, and this embedding groove is through-holes on the side of the ejector fixing plate 43 and the ejector base plate 44.

[0032] Reference Figure 1 and 2In this embodiment, the quick-release assembly 52 includes a positioning block 521 and a positioning strip 522. The positioning block 521 is installed in the embedded groove, and one side of the positioning block 521 penetrates the embedded groove and abuts against the outer wall of the ejector base plate 44. The positioning strip 522 is installed through the positioning block 521 and is threadedly connected to the mounting block 512.

[0033] During installation, the ejector mechanism 4 is first installed on the lower mold 2, and the ejector fixing plate 43 and the ejector base plate 44 are installed from the inside to the outside on the side of the lower mold 2 away from the upper mold 1. Then, the pads 511 are symmetrically installed on both sides of the ejector fixing plate 43 and the ejector base plate 44. Next, the positioning strips 522 are used to install multiple positioning blocks 521 in the corresponding embedded grooves, and the positioning blocks 521 penetrate the inner wall of one side of the embedded groove and abut against the outer wall of the ejector base plate 44, thereby completing the quick installation of the ejector mechanism 4 and achieving the effect of stable use of the ejector mechanism 4. In addition, by reversing the above steps, the ejector mechanism 4 can be quickly disassembled, thereby effectively improving the disassembly and assembly efficiency of the ejector mechanism 4 in the existing bicycle wheel hub forming mold.

[0034] Reference Figure 1 and 2 To improve the stability of the ejection mechanism 4, an auxiliary feeding mechanism 6 is installed on one side wall of the upper mold 1. In this embodiment, the auxiliary feeding mechanism 6 includes a slitting cylinder 61 and a cutter 62. The slitting cylinder 61 is fixedly installed on one side outer wall of the upper mold 1, and the output end of the slitting cylinder 61 extends into the interior of the upper mold 1, while the cutter 62 is fixedly installed at the output end of the slitting cylinder 61.

[0035] After the mold is opened, the cutting cylinder 61 is started. The cutting blade 62 separates the formed hub in the cavity 3 from the waste material formed at the sprue in the upper mold 1. Then, the ejector pin 41 of the ejector mechanism 4 ejects the formed hub, thereby achieving the purpose of fast and stable material feeding.

[0036] Example 2: Reference Figure 1 , 4 The difference between Embodiment 2 and Embodiment 1 is that, in this embodiment, the limiting mechanism 5 includes a side stop assembly 51 and a fixing assembly 53. The side stop assembly 51 is detachably installed on one side of the lower mold 2 and connected to the side wall of the ejection fixing plate 43 and the ejection bottom plate 44, while the fixing assembly 53 is rotatably installed on the side wall of the side stop assembly 51.

[0037] Reference Figure 5 and 6In this embodiment, the side baffle assembly 51 includes pads 511 and connectors 513. Two pads 511 are provided, and are bolted to the side wall of the lower mold 2, with each pad abutting against the opposite sides of the ejector fixing plate 43 and the ejector base plate 44. The connectors 513 are slidably mounted on the side of the pads 511 closest to the ejector fixing plate 43 and the ejector base plate 44, and the connectors 513 correspond to the positions of the mounting blocks 512 on each pad 511.

[0038] At the same time, refer to Figure 7 and 8 A groove 514 is provided on the side of the two pads 511 that are close to each other and at a position corresponding to the mounting block 512. In this embodiment, the connecting member 513 includes a linkage spring 515 and a linkage block 516. The spring is fixedly installed in the groove 514, and the linkage block 516 is fixedly installed on the other end of the linkage spring 515 and slides into the groove 514. At the same time, the end of the linkage block 516 near the lower mold 2 is set with a slope. In addition, a mating groove 441 is provided on the side wall of the ejector base plate 44 near the pads 511 to slide into the linkage block 516.

[0039] Reference Figure 5 and 6 In this embodiment, the fixing component 53 includes a rotating member 531 and a stabilizing member 532. The rotating member 531 is mounted on the outer wall of the pad 511 and corresponds to the position of the mounting block 512 on each pad 511. In this embodiment, the rotating member 531 can be a hinge. Meanwhile, the stabilizing member 532 is rotatably mounted on the outer wall of the pad 511 via the rotating member 531.

[0040] Additionally, refer to Figure 7 and 8 In this embodiment, the stabilizing component 532 includes a clamping block 533 and a screw-in block 534. The clamping block 533 is fixedly mounted on the rotating component 531 and engages with the embedded groove. Simultaneously, a linkage hole and a threaded hole are sequentially formed from the outside to the inside within the linkage block 516, and an inclined surface is provided on the inner wall of the linkage hole near the ejector base plate 44. The screw-in block 534 passes through the clamping block 533 and the linkage hole sequentially, and slides with the inclined surface within the linkage hole. One end of the screw-in block 534, passing through the linkage hole, is threadedly connected to the threaded hole and simultaneously abuts against the pad block 511 and the ejector base plate 44.

[0041] Furthermore, a connecting strip 535 is rotatably connected to one side of the screw block 534. Simultaneously, a connecting groove 442 is formed on the side wall of the ejector base plate 44, which slides with the connecting strip 535. The end of the connecting groove 442 away from the mating groove 441 penetrates the side wall of the ejector base plate 44 away from the ejector fixing plate 43. A connecting spring 536 is fixedly installed on one side of the connecting strip 535. The end of the connecting spring 536 away from the connecting strip 535 abuts against the inner wall of the connecting groove 442 near the ejector fixing plate 43.

[0042] Reference Figure 7 and 8 In order to further improve the stability of the ejection mechanism 4 during use, multiple clearance holes 519 are provided on the side of the two pads 511 that are close to each other, and an extension is provided in the clearance hole 519. At the same time, a mating groove 441 corresponding to the position of the extension is provided on the side wall of the ejection base plate 44.

[0043] Additionally, refer to Figure 5 and 6 In this embodiment, the extension member includes an extension spring 517 and an extension protrusion 518. The extension spring 517 is fixedly installed in the relief hole 519, while the protrusion is fixedly installed at the other end of the extension spring 517 and engages with the relief hole 519 and the sliding joint.

[0044] Furthermore, Embodiment 2 of this application also discloses a method for replacing ejector pins in a bicycle wheel hub forming mold, comprising the following steps: Step 1: Unscrew the screw block 534 out of the linkage block 516 and flip the clamping block 533 to separate the clamping block 533 from the pad block 511 and the ejector base plate 44. Step 2: After flipping the clamping block 533, the linkage block 516 retracts into the groove 514 under the action of the linkage spring 515. Then, the entire ejection mechanism 4 is removed from the side wall of the lower mold 2. Step 3: Reinstall the new ejection mechanism 4 onto the side wall of the lower mold 2, then flip the clamping block 533 and drive the linkage block 516 to slide into the corresponding mating groove 441 of the ejection base plate 44 through the screw block 534, so that the fixing component 53 and the side block component 51 are connected, and the ejector pin 41 is quickly replaced.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bicycle wheel hub forming mold that facilitates ejector pin replacement, characterized in that: It includes an upper mold (1) and a lower mold (2), which together form a cavity (3). An ejection mechanism (4) that penetrates into the cavity (3) is movably provided on one side of the lower mold (2), and a limiting mechanism (5) for limiting the ejection mechanism (4) is provided on one side of the lower mold (2). The limiting mechanism (5) includes a side blocking assembly (51) and a fixing assembly (53). The side blocking assembly (51) is movably disposed on the lower mold (2) and connected to the side wall of the ejection mechanism (4). The fixing assembly (53) is movably disposed on the side wall of the side blocking assembly (51) and connected to the side wall of the ejection mechanism (4). The side block assembly (51) includes a pad (511) and a connector (513). The pad (511) is located on the outside of the lower mold (2) and abuts against the side wall of the ejection mechanism (4). The connector (513) is movably located on the side wall of the pad (511) and is inserted into the ejection mechanism (4). The fixing component (53) includes a rotating component (531) and a stabilizing component (532), wherein the stabilizing component (532) is movably disposed on the side wall of the pad (511) via the rotating component (531); The stabilizer (532) extends through the inside of the ejection mechanism (4) and is connected to the connector (513).

2. The bicycle wheel hub forming mold with easy ejector pin replacement according to claim 1, characterized in that: The upper mold (1) is provided with an auxiliary feeding mechanism (6) on its side wall. The output end of the auxiliary feeding mechanism (6) extends into the upper mold (1) and is used to separate the formed wheel hub from the waste material.

3. A method for replacing the ejector pin in a bicycle wheel hub forming mold as described in claim 1, characterized in that: Includes the following steps: Step 1: Separate the fixing component (53) from the side guard component (51) and the ejection mechanism (4); Step 2: After rotating the fixed component (53), remove the entire ejection mechanism (4) from the side wall of the lower mold (2); Step 3: Reinstall the new ejection mechanism (4) onto the side wall of the lower mold (2), then rotate the fixing component (53) and connect it to the side baffle component (51) to complete the replacement.

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