Wear-resistant injection mold ejector pin

Abstract

The utility model discloses a wear-resistant injection mold ejector pin which comprises an ejector pin base, an ejector pin shaft, a first bearing ring, a second bearing ring, a third bearing ring and a gland, the ejector pin shaft is sequentially provided with a first shaft neck part, a second shaft neck part, a third shaft neck part and a fourth shaft neck part from bottom to top, the first shaft neck part is sleeved with the first bearing ring, the second shaft neck part is sleeved with the second bearing ring, the third shaft neck part is sleeved with the third bearing ring, and a spherical ejector block is arranged at the top end of the fourth shaft neck part. According to the utility model, the plurality of shaft necks are arranged on the ejector pin shaft, so that the loading force borne by the ejector pin shaft in the working process can be transferred and dispersed in a grading manner, and abrasion and deformation caused by overlarge local stress are avoided; by arranging the first bearing ring, the second bearing ring and the third bearing ring, the ejector pin shaft can stably rotate in the ejection process, so that friction and ejection resistance are reduced, the situation that the ejector pin shaft is stuck to a product and consequently the ejector pin shaft is stuck is prevented, and therefore the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of mold ejector pins, in particular to a wear-resistant injection mold ejector pin. Background Art

[0002] The injection molding process occupies an important position in the production of plastic products and is widely used in various fields such as automobiles, home appliances, electronic products, medical devices, etc. The mold ejector, as a key component in the injection mold, has the main function of ejecting the molded plastic part from the mold cavity to ensure the integrity and appearance quality of the product.

[0003] In the prior art, the ejector pin of the mold frequently contacts and rubs against the plastic part in the mold cavity. After working for a long time, the surface of the ejector pin is prone to wear, resulting in a decrease in its dimensional accuracy, affecting the ejection effect and further affecting the product quality. In addition, if the weight of the product is large, the ejector pin will be subjected to greater pressure during the ejection process, resulting in increased friction between the ejector pin and the mold cavity, which is likely to cause adhesion during the ejection process, thereby affecting the production quality of the product.

[0004] Therefore, the prior art has defects and needs to be improved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a wear-resistant injection mold ejector with stable structure, long service life and small friction coefficient.

[0006] To achieve this purpose, the utility model adopts the following technical scheme: a wear-resistant injection mold ejector, comprising an ejector base, an ejector shaft, a first bearing ring, a second bearing ring, a third bearing ring and a pressure cover;

[0007] The ejector shaft is provided with a first neck portion, a second neck portion, a third neck portion and a fourth neck portion in sequence from bottom to top, the first bearing ring is sleeved on the first neck portion, the second bearing ring is sleeved on the second neck portion, and the third bearing ring is sleeved on the third neck portion;

[0008] The ejector base has an accommodating chamber, and the accommodating chamber is provided with a first step groove, a second step groove and a third step groove in sequence from bottom to top, the first bearing ring is located in the first step groove, the second bearing ring is located in the second step groove, and the third bearing ring is located in the third step groove;

[0009] The pressure cover is sleeved on the third shaft neck, and is used to press the third bearing ring into the third step groove. A spherical top block is provided at the top of the fourth shaft neck, and a surface of the spherical top block is coated with a TiCN coating.

[0010] By adopting the above technical solution, in the wear-resistant injection mold ejector, the first bearing ring is a roller bearing, and the second bearing ring and the third bearing ring are ball bearings.

[0011] By adopting the above-mentioned technical solutions, in the wear-resistant injection mold ejector, a first transition slope is provided between the first shaft neck and the second shaft neck;

[0012] A second transition slope is provided between the second journal neck and the third journal neck;

[0013] A third transition slope is provided between the third journal neck and the fourth journal neck.

[0014] By adopting the above-mentioned technical solutions, in the wear-resistant injection mold ejector, the diameter of the first shaft neck portion is smaller than the diameter of the second shaft neck portion;

[0015] A diameter of the second journal portion is smaller than a diameter of the third journal portion.

[0016] By adopting the above-mentioned technical solutions, in the wear-resistant injection mold ejector, the pressure cover and the top of the ejector base are locked and connected by bolts.

[0017] By adopting the above-mentioned technical solutions, in the wear-resistant injection mold ejector, the ejector shaft is made of high-speed steel or mold steel.

[0018] By adopting the above-mentioned technical solutions, in the wear-resistant injection mold ejector, a circular step is provided at the bottom of the ejector base, and the circular step is used for clamping with the mold ejector plate.

[0019] By adopting the above-mentioned technical solutions, in the wear-resistant injection mold ejector pin, the thickness of the TiCN coating is 1-5 μm.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model arranges a plurality of shaft necks on the ejector shaft, so that the load force borne by the ejector shaft during the working process can be transmitted and dispersed in stages, thereby avoiding wear and deformation caused by excessive local force, thereby extending the service life of the ejector; the arrangement of the first bearing ring, the second bearing ring and the third bearing ring can enable the ejector shaft to rotate smoothly during the ejection process, so as to reduce friction and ejection resistance, prevent the ejector shaft and the product from sticking and causing jamming, thereby improving product quality; the TiCN coating can improve the wear resistance of the spherical ejector block, reduce wear caused by frequent contact friction, thereby extending the service life of the ejector. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 It is a schematic diagram of the explosion structure of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the ejector base of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the first bearing ring of the utility model. DETAILED DESCRIPTION

[0028] In order to make the utility model's purpose, features, and advantages more obvious and easy to understand, the following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the embodiments described below are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0030] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0031] like Figures 1 to 4 As shown, the embodiment of the utility model provides a wear-resistant injection mold ejector, including an ejector base 10, an ejector shaft 20, a first bearing ring 31, a second bearing ring 32, a third bearing ring 33 and a pressure cover 40;

[0032] The ejector shaft 20 is provided with a first neck portion 201, a second neck portion 202, a third neck portion 203 and a fourth neck portion 204 from bottom to top, the first bearing ring 31 is sleeved on the first neck portion 201, the second bearing ring 32 is sleeved on the second neck portion 202, and the third bearing ring 33 is sleeved on the third neck portion 203; by arranging a plurality of neck portions on the ejector shaft 20, the load force borne by the ejector during operation can be transmitted and dispersed in stages, thereby avoiding wear and deformation caused by excessive local force, thereby extending the service life of the ejector; the arrangement of the first bearing ring 31, the second bearing ring 32 and the third bearing ring 33 enables the ejector shaft 20 to achieve smooth rotation during the ejection process, so as to reduce friction and ejection resistance, prevent the ejector shaft 20 from sticking to the product and causing jamming, thereby improving product quality.

[0033] The ejector base 10 has a accommodating chamber, and the accommodating chamber is provided with a first step groove 101, a second step groove 102 and a third step groove 103 from bottom to top. The first bearing ring 31 is located in the first step groove 101, the second bearing ring 32 is located in the second step groove 102, and the third bearing ring 33 is located in the third step groove 103. Such an arrangement can improve the stability of the installation structure of each bearing ring, ensure that the ejector shaft 20 maintains good coaxiality during the ejection and retraction process, avoid the ejector shaft 20 from deflecting or shaking during the movement, and improve the accuracy of the ejection process.

[0034] The pressure cap 40 is sleeved on the third shaft neck 203, and the pressure cap 40 is used to press the third bearing ring 33 into the third step groove 103, ensuring that each bearing ring will not be displaced or loosened due to vibration or force during the ejection process; the top of the fourth shaft neck 204 is provided with a spherical top block 205, and the surface of the spherical top block 205 is coated with a TiCN coating. The structure of the spherical top block 205 can make the ejection force evenly distributed on the contact surface of the plastic product, avoiding deformation or damage of the product due to uneven force. Compared with the plane top block, the spherical top block 205 can better adapt to the surface shape of the plastic product, thereby realizing a smooth ejection process; the TiCN coating can improve the wear resistance of the spherical top block 205, reduce the wear caused by frequent contact friction, and thus extend the service life of the ejector pin.

[0035] like Figure 2 and Figure 4 As shown, further, the first bearing ring 31 is a roller bearing, and the second bearing ring 32 and the third bearing ring 33 are ball bearings. The first bearing ring 31 located at the bottom of the ejector shaft 20 is a roller bearing, which has a cylindrical roller 310 inside, has a large contact area, and can withstand a large radial load, thereby effectively sharing the radial force on the ejector shaft 20 during the ejection process; the second bearing ring 32 and the third bearing ring 33 located at the middle of the top of the ejector shaft 20 are ball bearings, which have spherical rollers inside, and can withstand radial loads and certain axial loads, thereby providing good support.

[0036] like Figure 2 As shown, further, a first transition bevel 206 is provided between the first journal 201 and the second journal 202, a second transition bevel 207 is provided between the second journal 202 and the third journal 203, and a third transition bevel 208 is provided between the third journal 203 and the fourth journal 204. The provision of the transition bevels makes the transition between the journals smoother, avoids the sharp corner stress concentration caused by the right-angle transition, and has better fatigue resistance under high load conditions.

[0037] like Figure 2 As shown, further, the diameter of the first journal 201 is smaller than the diameter of the second journal 202, and the diameter of the second journal 202 is smaller than the diameter of the third journal 203. The diameter of the lower section of the ejector shaft 20 is set in increments, which can effectively grade the load and improve the stability of the overall structure; and the journals with different diameters are equipped with corresponding bearing rings, thereby effectively improving the assembly efficiency.

[0038] like Figure 1 and Figure 2As shown, further, the gland 40 is connected to the top of the ejector base 10 by bolt locking. By adjusting the locking torque of the bolt, the degree of compression of the gland 40 can be controlled to ensure that the third bearing ring 33 is evenly stressed and avoid bearing damage caused by excessive compression.

[0039] Furthermore, the ejector shaft 20 is made of high-speed steel or die steel. In this embodiment, the ejector shaft 20 is made of high-speed steel, which is not only hard but also has good toughness, can withstand the impact and vibration generated during the ejection process, and is not prone to breakage or damage.

[0040] like Figure 1 As shown, further, a circular step 100 is provided at the bottom of the ejector base 10, and the circular step 100 is used to clamp with the ejector plate of the mold. The provision of the circular step 100 enables the ejector base 10 to be accurately aligned during installation, avoiding ejection misalignment caused by position offset.

[0041] Furthermore, the thickness of the TiCN coating is 1-5 μm. In this embodiment, the thickness of the TiCN coating is 3 μm.

[0042] The utility model arranges a plurality of shaft necks on the ejector shaft, so that the load force borne by the ejector shaft during the working process can be transmitted and dispersed in stages, thereby avoiding wear and deformation caused by excessive local force, thereby extending the service life of the ejector; the arrangement of the first bearing ring, the second bearing ring and the third bearing ring can enable the ejector shaft to rotate smoothly during the ejection process, so as to reduce friction and ejection resistance, prevent the ejector shaft and the product from sticking and causing jamming, thereby improving product quality; the TiCN coating can improve the wear resistance of the spherical ejector block, reduce wear caused by frequent contact friction, thereby extending the service life of the ejector.

[0043] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A wear-resistant injection mold ejector pin, characterized in that: It includes an ejector base, an ejector shaft, a first bearing ring, a second bearing ring, a third bearing ring and a pressure cover; The ejector shaft is provided with a first neck portion, a second neck portion, a third neck portion and a fourth neck portion in sequence from bottom to top, the first bearing ring is sleeved on the first neck portion, the second bearing ring is sleeved on the second neck portion, and the third bearing ring is sleeved on the third neck portion; The ejector base has an accommodating chamber, and the accommodating chamber is provided with a first step groove, a second step groove and a third step groove in sequence from bottom to top, the first bearing ring is located in the first step groove, the second bearing ring is located in the second step groove, and the third bearing ring is located in the third step groove; The pressure cover is sleeved on the third shaft neck, and is used to press the third bearing ring into the third step groove. A spherical top block is provided at the top of the fourth shaft neck, and a surface of the spherical top block is coated with a TiCN coating.

2. The wear-resistant injection mold ejector pin according to claim 1, characterized in that: The first bearing ring is a roller bearing, and the second bearing ring and the third bearing ring are ball bearings.

3. The wear-resistant injection mold ejector pin according to claim 1, characterized in that: A first transition slope is provided between the first journal neck and the second journal neck; A second transition slope is provided between the second journal neck and the third journal neck; A third transition slope is provided between the third journal neck and the fourth journal neck.

4. The wear-resistant injection mold ejector pin according to claim 1, characterized in that: The diameter of the first shaft neck portion is smaller than the diameter of the second shaft neck portion; A diameter of the second journal portion is smaller than a diameter of the third journal portion.

5. The wear-resistant injection mold ejector pin according to claim 1, characterized in that: The gland is locked and connected to the top of the ejector base by bolts.

6. The wear-resistant injection mold ejector pin according to claim 1, characterized in that: The ejector shaft is made of high-speed steel or die steel.

7. The wear-resistant injection mold ejector pin according to claim 1, characterized in that: A circular step is provided at the bottom of the ejector base, and the circular step is used for clamping with the ejector plate of the mold.

8. The wear-resistant injection mold ejector according to any one of claims 1 to 7, characterized in that: The thickness of the TiCN coating is 1-5 μm.

Images