Plastic gear mold of automobile windscreen wiper and quick replacement method of plastic gear mold

Abstract

The invention discloses a plastic gear mold of an automobile windscreen wiper and a rapid replacement method of the plastic gear mold, and the plastic gear mold comprises an upper mold frame and an upper mold plate which form an upper mold assembly; the lower die plate, the gear shaft ejector pin, the stripper plate and the bottom plate form a lower die assembly; the upper die assembly and the lower die assembly are positioned by a plurality of guide columns and guide sleeves; preferably, the upper mold plate and the lower mold plate are provided with cavities for forming an inner ring and a middle ring of the plastic gear, an outer ring mold for forming an outer ring of the gear is fixed on the upper mold plate or the lower mold plate, the upper mold plate, the lower mold plate and the outer ring mold are provided with cavities for forming an outer ring of the plastic gear, and the tooth profile of the plastic gear is generated by the outer ring mold. And the outer ring die is fixed with the lower die plate through a screw. The lower mold plate is provided with a cavity for containing the outer ring mold, the outer ring mold is embedded into the cavity of the lower mold plate, and the mold has the beneficial effects of being simple in structure, low in cost, convenient to use and high in working efficiency.

Description

Technical Field

[0001] The invention relates to a plastic gear mould of an automobile windshield wiper and a quick replacement method thereof. Background Art

[0002] China's automobile sales have ranked first in the world for many years. Automobiles are durable goods with a service life of more than ten years. Some parts, such as automobile wipers, are inevitable for repair and replacement. After a certain number of years, due to various reasons such as high production costs, thin profits, and low sales, many original manufacturers no longer provide wiper accessories, and instead turn to other professional parts manufacturers to provide alternative products. Due to the wide variety of automobile brands and models, there are also many types of wipers on the market. Wipers are mainly composed of wiper rods, motors, reduction swing structures, gears, return plates, etc. There are many differences between various gears and return plates, which are mainly reflected in the diameter, module, number of teeth, pressure angle and helix angle of the gears and the shape of their return plates. Taking the gear and return plate assembly as an example, Figure 2 , Figure 3 and Figure 5 For the same gear and return plate assembly, Figure 4 For different return plate components, Figure 3 The return plate 94 with Figure 4 The return plate has different shapes. Figure 4 In the embodiment, the motor is powered off after the contact piece 982 is disconnected from the contact piece 983, and the motor is braked after the contact piece 982 is connected to the contact piece 981; Figure 5 In the process, the motor is powered off after the contact piece 992 is disconnected from the contact piece 991, and the motor is braked after the contact piece 992 is connected to the contact piece 993. Figure 4 On the contrary, as can be seen from the figure, different products have different structures and cannot be directly replaced; but for different products, if the parts are further disassembled, some parts of the parts may be the same. In order to standardize the production of gears, reduce the development of numerous molds, save development and production costs, and compress development and production time, gear standardization and quick gear mold change are very necessary. Summary of the invention

[0003] In accordance with the above requirements, the present invention provides a plastic gear mold for an automobile wiper.

[0004] The technical solution of the present invention is:

[0005] A plastic gear mold for a car wiper, comprising:

[0006] An upper mold frame and an upper mold plate, which constitute an upper mold assembly;

[0007] The lower mold plate, the gear shaft ejector pin, the stripper plate and the bottom plate constitute the lower mold assembly;

[0008] The upper die assembly and the lower die assembly are positioned by multiple guide pins and guide sleeves;

[0009] Preferably, the upper template and the lower template are provided with cavities for forming the inner ring and the middle ring of the plastic gear, the upper template or the lower template is fixed with an outer ring mold for forming the outer ring of the gear, the upper template, the lower template and the outer ring mold are provided with a cavity for forming the outer ring of the plastic gear, and the tooth shape of the plastic gear is generated by the outer ring mold.

[0010] Preferably, the outer ring mold is fixed to the lower mold plate by screws.

[0011] Preferably, the lower template is provided with a cavity for placing the outer ring mold, and the outer ring mold is embedded in the cavity of the lower template, and further comprises:

[0012] The outer ring pressure plate is pressed on the lower template and the outer ring mold, and is fixed by the pressure ring screws that penetrate the outer ring pressure plate and the lower template.

[0013] Preferably, the middle ring of the plastic gear is provided with a plurality of through holes capable of connecting to a wiper return plate, and the latch pins of the wiper return plate can be inserted into the through holes for fixation.

[0014] Preferably, a hot runner fixing plate is fixed between the upper mold frame and the upper mold plate, and the hot runner fixing plate is fixed with a hot runner structure. The plastic entering from the feed port of the upper mold frame is heated to a constant temperature by the hot runner structure and then enters the pouring port of the upper mold plate from the injection port of the hot runner fixing plate.

[0015] Preferably, the upper mold frame, the hot runner fixing plate and the upper mold plate are fixed as a whole.

[0016] A method for quickly replacing a plastic gear mold of a car wiper comprises the following steps:

[0017] S1. A positioning plate is fixed on the mounting base of the injection molding machine, wherein the positioning plate is close to the bottom plate of the plastic gear mold installed on the injection molding machine in at least one direction of the X-axis and at least one direction of the Y-axis;

[0018] S2. The upper mold assembly is fixed to the movable plate of the injection molding machine, the lower mold assembly is fixed to the mounting base of the injection molding machine, and the upper mold assembly and the lower mold assembly are separated;

[0019] S3. Move the lower die assembly away from the positioning plate, replace the outer ring die or the gear shaft ejector, and then move it back in until it is close to the positioning plate.

[0020] Preferably, the positioning plate is U-shaped and can limit the two directions of the X-axis.

[0021] Preferably, the upper mold frame, hot runner fixing plate and upper template have equal outer dimensions in length and width, and the outer dimensions of the upper mold frame, hot runner fixing plate and upper template between different plastic gear molds are equal in length and width, the height dimension remains unchanged, and the plates are positioned with pins; the bottom plate, stripping plate 1, stripping plate 2 and lower template have equal outer dimensions in length and width, and the outer dimensions of the bottom plate, stripping plate 1, stripping plate 2 and lower template between different plastic gear molds are equal in length and width, the height dimension remains unchanged, and the plates are positioned with pins.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] Each component is standardized and has strong versatility. Plastic gears of different model parameters can be produced by simply replacing the outer ring mold, and gears of different shaft extension lengths can be produced by simply replacing the gear shaft ejector.

[0024] The cost is greatly reduced and the development efficiency is significantly improved;

[0025] The mold can be changed quickly and installed on the injection molding machine quickly.

[0026] The invention has the beneficial effects of simple structure, low cost, convenient use and high working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a cross-sectional view of the overall structure of the present invention, in which one mold is used to make two products.

[0028] Figure 2 This is a three-dimensional diagram of the overall structure of a plastic gear of the present invention.

[0029] Figure 3 for Figure 2 Parts drawing.

[0030] Figure 4 The present invention is a schematic diagram of a plastic gear structure in the prior art.

[0031] Figure 5 The figure is another schematic diagram of the structure of plastic gear in the prior art.

[0032] Figure 6 It is a structural schematic diagram of the rapid replacement method of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described with reference to the accompanying drawings:

[0034] like Figure 1 As shown, a plastic gear mold for a car wiper includes:

[0035] The upper mold frame 2 and the upper mold plate 6 constitute an upper mold assembly;

[0036] The lower mold plate 11, the gear shaft ejector pin 12, the stripper plate and the bottom plate constitute the lower mold assembly;

[0037] The upper die assembly and the lower die assembly are positioned by multiple guide pins and guide sleeves, which is a prior art and is not reflected in the drawings;

[0038] The upper template 6 and the lower template 11 are provided with cavities for forming the inner ring 91 and the middle ring 92 of the plastic gear 9. The upper template 6 or the lower template 11 is fixed with the outer ring mold 8 for forming the outer ring 93 of the gear. The upper template 6, the lower template 11 and the outer ring mold 8 are provided with a cavity for forming the outer ring 93 of the plastic gear 9. The tooth shape of the plastic gear 9 is generated by the outer ring mold 8.

[0039] The embodiment in the drawings of the present invention preferably has the outer ring mold 8 for forming the outer ring 93 of the gear fixed to the lower mold plate 11, because the outer ring mold 8 fixed by the lower mold plate 11 is easier to install.

[0040] The present invention divides the plastic gear 9 into three parts: an inner ring 91, a middle ring 92 and an outer ring 93. The inner ring 91 is mainly a part connected to the gear shaft 10, the middle ring 92 is mainly a supporting part, and the outer ring 93 is mainly a part with teeth on the outer edge. It should be noted that there is no strict limitation on the size as long as it does not reduce the product quality.

[0041] Compared with the prior art, the different plastic gears of the present invention only require the replacement of the outer ring 93, which greatly reduces the mold opening cost and shortens the mold opening time.

[0042] As one of the embodiments, the outer ring mold 8 is fixed to the lower mold plate 11 by screws.

[0043] As a second embodiment, the lower template 11 is provided with a cavity for placing the outer ring mold 8, and the outer ring mold 8 is embedded in the cavity of the lower template 11, and further includes:

[0044] The outer ring pressing plate 7 is pressed on the lower mold plate 11 and the outer ring mold 8, and is fixed by the pressing ring screws 71 that penetrate into the outer ring pressing plate 7 and the lower mold plate 11.

[0045] In this embodiment, the outer ring mold 8 is fixed by the outer ring pressing plate 7, which can further reduce the material used for the outer ring mold 8 and further reduce the cost.

[0046] Furthermore, the middle ring 92 of the plastic gear 9 is provided with a plurality of through holes that can be connected to the wiper return plate, and the pins of the wiper return plate can be inserted into the through holes for fixing; the low-cost PA66 plastic part of the return plate 94 occupies the space originally occupied by the middle ring 92, saving the high-cost POM material of the gear 9, and reducing the material cost without affecting the plastic strength of the tooth part of the gear.

[0047] In the prior art, the wiper return plate and the plastic gear are designed separately, and different wiper return plates and plastic gears do not need to be interchanged, which leads to a high cost problem. The present invention is designed into a universal structure to reduce the cost.

[0048] A hot runner fixing plate 3 is fixed between the upper mold frame 2 and the upper mold plate 6, and a hot runner structure 4 is fixed to the hot runner fixing plate 3. The plastic entering from the feed port 1 of the upper mold frame 2 is heated to a constant temperature by the hot runner structure 4 and then enters the pouring port of the upper mold plate 6 from the injection port of the hot runner fixing plate 3. The present invention adds the hot runner structure 4, eliminates the injection molding head, and reduces the weight.

[0050] Preferably, the upper mold frame 2, the hot runner fixing plate 3 and the upper mold plate 6 are fixed as one body and can be used as a module.

[0051] A method for quickly replacing a plastic gear mold of a car wiper comprises the following steps:

[0052] S1. The positioning plate 17 is fixed on the mounting base of the injection molding machine, and the positioning plate 17 is close to the bottom plate of the plastic gear mold installed on the injection molding machine in at least one direction of the X-axis and at least one direction of the Y-axis;

[0053] S2. The upper mold assembly is fixed to the movable plate of the injection molding machine, the lower mold assembly is fixed to the mounting base of the injection molding machine, and the upper mold assembly and the lower mold assembly are separated;

[0054] S3. Move the lower die assembly away from the positioning plate 17, replace the outer ring die 8 or the gear shaft ejector pin 12, and then move it back in until it is close to the positioning plate 17. The gear shaft ejector pin 12 can also be replaced as needed.

[0055] It should be noted that in the prior art, when changing the mold, it takes a lot of time to align the plastic injection port of the injection molding machine and the mold. The present invention only needs to replace the outer ring mold 8, and the other dimensions and positions of the plastic gear mold remain unchanged. The purpose of rapid positioning can be achieved through a simple positioning plate 17, which greatly shortens the time for changing the mold.

[0056] Furthermore, the positioning support plate 17 is in a U shape, which can limit the two directions of the X axis. This method is more efficient and more accurate in positioning.

[0057] The upper mold frame 2, the hot runner fixing plate 3 and the upper mold plate 6 have the same outer dimensions in length and width. The upper mold frame 2, the hot runner fixing plate 3 and the upper mold plate 6 have the same outer dimensions in length and width between different plastic gear molds, and the height dimension remains unchanged. The plates are positioned with pins; the bottom plate 15, the stripping plate 113, the stripping plate 214 and the lower mold plate 11 have the same outer dimensions in length and width. The bottom plate 15, the stripping plate 113, the stripping plate 214 and the lower mold plate 11 have the same outer dimensions in length and width between different plastic gear molds, and the height dimension remains unchanged. The plates are positioned with pins.

[0058] The technical solution is to standardize each component in the whole to facilitate replacement, and the raw materials are also standardized to facilitate preparation.

[0059] The gear shaft ejector pin 12 can also be replaced as needed, so that gears with different shaft extension lengths can be produced.

Claims

1. A plastic gear mold for a car wiper, comprising: An upper mold frame (2) and an upper mold plate (6), which constitute an upper mold assembly; The lower mold plate (11), the gear shaft ejector pin (12), the stripper plate and the bottom plate constitute the lower mold assembly; The upper die assembly and the lower die assembly are positioned by multiple guide pins and guide sleeves; The invention is characterized in that the upper template (6) and the lower template (11) are provided with cavities for forming the inner ring (91) and the middle ring (92) of the plastic gear (9); the upper template (6) or the lower template (11) is fixed with an outer ring mold (8) for forming the outer ring (93) of the gear; the upper template (6), the lower template (11) and the outer ring mold (8) are provided with a cavity for forming the outer ring (93) of the plastic gear (9); and the tooth shape of the plastic gear (9) is generated by the outer ring mold (8).

2. A plastic gear mold for automobile wipers as claimed in claim 1, characterized in that: The outer ring mold (8) is fixed to the lower mold plate (11) by screws.

3. The plastic gear mold for automobile wiper as claimed in claim 1, characterized in that: The lower template (11) is provided with a cavity for placing the outer ring mold (8), and the outer ring mold (8) is embedded in the cavity of the lower template (11), and further comprises: The outer ring pressure plate (7) is pressed on the lower mold plate (11) and the outer ring mold (8), and is fixed by a pressure ring screw (71) that penetrates the outer ring pressure plate (7) and the lower mold plate (11).

4. A plastic gear mold for automobile wiper as claimed in claim 3, characterized in that: The middle ring (92) of the plastic gear (9) is provided with a plurality of through holes capable of connecting to a wiper return plate, and the latch pins of the wiper return plate can be inserted into the through holes for fixation.

5. A plastic gear mold for a car wiper according to any one of claims 1 to 4, characterized in that: A hot runner fixing plate (3) is fixed between the upper mold frame (2) and the upper mold plate (6), and a hot runner structure (4) is fixed to the hot runner fixing plate (3). Plastic entering from the feed port (1) of the upper mold frame (2) is heated to a constant temperature by the hot runner structure (4) and then enters the pouring port of the upper mold plate (6) from the injection port of the hot runner fixing plate (3).

6. A plastic gear mold for automobile wipers as claimed in claim 5, characterized in that: The upper mold frame (2), the hot runner fixing plate (3) and the upper mold plate (6) are fixed as a whole.

7. A method for quickly replacing a plastic gear mold for a car wiper, characterized in that: The steps include: S1. A positioning plate (17) is fixed on the mounting base of the injection molding machine, wherein the positioning plate (17) is close to the bottom plate of the plastic gear mold installed on the injection molding machine in at least one direction of the X-axis and at least one direction of the Y-axis; S2. The upper mold assembly is fixed to the movable plate of the injection molding machine, the lower mold assembly is fixed to the mounting base of the injection molding machine, and the upper mold assembly and the lower mold assembly are separated; S3. Move the lower die assembly away from the positioning plate (17), replace the outer ring die (8) or the gear shaft ejector pin (12), and then move it back in until it is close to the positioning plate (17).

8. A method for quickly replacing a plastic gear mold for a car wiper as claimed in claim 7, characterized in that: The positioning plate (17) is U-shaped and can limit the two directions of the X-axis.

9. A method for quickly replacing a plastic gear mold for a car wiper as claimed in claim 7, characterized in that: The upper mold frame (2), the hot runner fixing plate (3) and the upper mold plate (6) have the same outer dimensions in length and width. The upper mold frame (2), the hot runner fixing plate (3) and the upper mold plate (6) have the same outer dimensions in length and width between different plastic gear molds, and the height dimension remains unchanged. The plates are positioned by pins. The bottom plate (15), the stripping plate 1 (13), the stripping plate 2 (14) and the lower mold plate (11) have the same outer dimensions in length and width. The bottom plate (15), the stripping plate 1 (13), the stripping plate 2 (14) and the lower mold plate (11) have the same outer dimensions in length and width between different plastic gear molds, and the height dimension remains unchanged. The plates are positioned by pins.

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