Steel injection mold with self-lubricating mechanism

Abstract

The utility model provides a steel injection mold with a self-lubricating mechanism, which relates to the technical field of injection molds and comprises a fixed mold, a movable mold arranged right above the fixed mold, an ejector rod chute arranged in an inner cavity of the movable mold, a first chute arranged on the side wall of the ejector rod chute, a sliding column slidably connected in the first chute, a connecting piece arranged on one side of the sliding column, and a second chute arranged on the other side of the sliding column. A first spring is fixed between one side of the connecting piece and the side wall of the first sliding groove, the upper end face of the first sliding groove is communicated with a second sliding groove, an upper sliding piece is connected into the second sliding groove in a sliding mode, the side wall of the second sliding groove is communicated with a third sliding groove, and a side sliding piece is connected into the third sliding groove in a sliding mode. When one-time injection molding process is completed, the ejector rod extrudes the sliding column, the sliding column extrudes the upper sliding piece upwards, and the upper sliding piece extrudes the side sliding piece towards the inner side of the third sliding groove, so that lubricating oil in the third sliding groove is extruded out through the cross intersection, the moving smoothness of the ejector rod is kept, and the lubricating effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a steel injection mold with a self-lubricating mechanism. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of injection molding are fast production speed, high efficiency, and automated operation. After injection molding, the product needs to be demolded. Ejection mechanism is a common automatic demolding method, suitable for small and simple plastic parts. The ejection mechanism uses pneumatic or hydraulic devices to push the plastic part out of the mold. During the ejection process, the ejector pin needs to make a long-term reciprocating motion relative to the mold, so the gap between the ejector pin and the supporting structure needs to be lubricated.

[0003] Existing lubrication technologies primarily rely on injecting or spraying lubricating oil into the tiny gaps between the ejector pins and their supporting structures before the injection mold leaves the factory or during a comprehensive overhaul. This lubrication method initially provides relatively smooth movement for the ejector pins, ensuring smooth ejection and resetting during mold opening and closing, thus guaranteeing successful demolding of the injection molded product and normal mold operation. However, over time, as the injection mold operates continuously under high-intensity, high-frequency production conditions, the lubricating oil gradually loses its original lubricating properties due to factors such as high temperature and mechanical friction. This significantly affects the smoothness of the ejector pins' movement, potentially leading to mold failure and impacting production efficiency and product quality. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a steel injection mold with a self-lubricating mechanism.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a steel injection mold with a self-lubricating mechanism, including a fixed mold, a movable mold located directly above the fixed mold, and an ejector pin groove formed in the inner cavity of the movable mold. An ejector pin is slidably connected inside the ejector pin groove, and the ejector pin is driven by a cylinder assembly. A first groove is formed on the side wall of the ejector pin groove, and a sliding column is slidably connected inside the first groove. A connecting piece is provided on one side of the sliding column, and a first spring is fixed between one side of the connecting piece and the side wall of the first groove. A second groove is connected to the upper end face of the first groove. The second slide groove is slidably connected to an upper slide member, both ends of which are inclined planes. The side wall of the second slide groove is connected to a third slide groove, and the third slide groove is slidably connected to a side slide member. One side of the side slide member is fixed to the side wall of the top rod slide groove, and the other side of the side slide member is in contact with the top of the upper slide member. The middle part of the third slide groove is connected to the side wall of the top rod slide groove. A silicone plug is provided at the connection between the middle part of the third slide groove and the side wall of the top rod slide groove, and a cross-shaped opening is provided in the middle of the silicone plug. The upper end face of the third slide groove is connected to a lubricating oil storage cavity.

[0006] Preferably, a locking plate is fixed to the side of the slide column near the connector, and a slot is provided on the side of the connector near the slide column. The slot consists of a square groove and a cylindrical groove, and a sliding plate is slidably connected inside the cylindrical groove. A third spring is fixed between the side of the sliding plate and the side wall of the cylindrical groove. Long-term friction between the slide column and the top rod will reduce the service life of the slide column. Therefore, the slide column needs to be replaced regularly to improve the continuity of the lubrication mechanism. To address this problem, this utility model adopts a detachable connection structure. During installation, the locking plate on one side of the slide column is inserted into the slot, the locking plate presses against the sliding plate, and then the slide column is rotated 180 degrees to prevent the locking plate from disengaging from the slot. During disassembly and maintenance, the slide column can be rotated in the opposite direction. The operation is simple and maintenance is convenient.

[0007] Preferably, the square groove is the same size as the locking plate, and the inner diameter of the cylindrical groove is not less than the diagonal length of the square groove, which improves the tightness between the locking plate and the slot, thereby improving the stability and anti-detachment performance of the sliding column.

[0008] Preferably, a slot is provided on the side of the square groove away from the locking plate, and the slot and the square groove are arranged in a cross shape. After rotating the slide column 180 degrees, the locking plate and the slot are engaged. With the help of the third spring, the stability and anti-disengagement performance of the slide column are further improved.

[0009] Preferably, the other side of the sliding column is hemispherical to reduce the contact area between the sliding column and the push rod, thereby reducing the wear of the push rod and the sliding column.

[0010] Preferably, the surface of the skateboard has anti-slip texture, which increases the friction between the skateboard and the locking plate, and further improves the stability of the locking plate.

[0011] Beneficial effects

[0012] Existing lubrication technologies primarily rely on injecting or spraying lubricating oil into the tiny gaps between the ejector pins and their support structures before the injection mold leaves the factory or during comprehensive maintenance. This lubrication method initially provides relatively smooth movement for the ejector pins, ensuring smooth ejection and resetting during mold opening and closing, thus guaranteeing successful demolding of the injection molded product and normal mold operation. However, over time, as the injection mold operates continuously under high-intensity, high-frequency production conditions, the lubricating oil gradually loses its original lubricating properties due to high temperatures and mechanical friction. This significantly affects the smoothness of the ejector pin movement, potentially leading to mold failure and impacting production efficiency and product quality. To address this issue, this invention employs an automatic lubrication mechanism. Each time an injection molding process is completed, the cylinder assembly... The push rod pushes the molded part out. As the push rod slides in the push rod groove, it squeezes the slide column, forcing it into the first groove. At this time, the slide column pushes the upper slide upward, and the upper slide pushes the side slide towards the inside of the third groove, thereby squeezing out the lubricating oil in the third groove through the cross-shaped opening. When the push rod retracts, under the action of the second and first springs, the side slide, upper slide, and slide column return to their original positions, and the lubricating oil in the lubricating oil storage cavity automatically drips down until it fills the third groove. Because the cross-shaped opening is made of silicone and has a small diameter, the lubricating oil in the third groove is difficult to seep out without external force. The little lubricating oil that seeps out will slowly lubricate the inner wall of the push rod groove, playing a dual lubrication role and not wasting too much lubricating oil. This maintains the smoothness of the push rod's movement and improves the lubrication effect. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a cross-sectional view of the light outlet of this utility model;

[0015] Figure 3 This is a three-dimensional structural diagram of the lubrication mechanism of this utility model;

[0016] Figure 4 This is a three-dimensional structural diagram of the detachable structure in this utility model;

[0017] Figure 5 This is a cross-sectional view of the detachable structure in this utility model.

[0018] Legend:

[0019] 1. Fixed mold; 2. Moving mold; 201. Ejector rod groove; 4. Ejector rod; 5. Cylinder assembly; 6. Slide column; 601. Clamping plate; 7. First spring; 8. Upper slide; 9. Side slide; 10. Second spring; 11. Lubricating oil storage cavity; 12. Connector; 1201. Slot; 1202. Slot; 13. Slide plate; 14. Third spring. Detailed Implementation

[0020] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0021] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific implementation examples:

[0023] Reference Figure 1-5 A steel injection mold with a self-lubricating mechanism includes a fixed mold 1, a movable mold 2 located directly above the fixed mold 1, and an ejector pin groove 201 formed in the inner cavity of the movable mold 2. An ejector pin 4 is slidably connected inside the ejector pin groove 201 and driven by a cylinder assembly 5. A first groove is formed on the side wall of the ejector pin groove 201, and a sliding column 6 is slidably connected inside the first groove. A connector 12 is provided on one side of the sliding column 6, and a first spring 7 is fixed between one side of the connector 12 and the side wall of the first groove. A second groove is connected to the upper end face of the first groove, and a sliding connection is formed inside the second groove. The upper slide 8 is connected to the upper slide 8. Both ends of the upper slide 8 are set as inclined planes. The side wall of the second slide groove is connected to the third slide groove, and the side slide 9 is slidably connected inside the third slide groove. A second spring 10 is fixed between one side of the side slide 9 and the side wall of the top rod slide groove 201. The other side of the side slide 9 is in contact with the top of the upper slide 8. The middle part of the third slide groove is connected to the side wall of the top rod slide groove 201. A silicone plug is provided at the connection between the middle part of the third slide groove and the side wall of the top rod slide groove 201. A cross-shaped opening is opened in the middle of the silicone plug. The upper end face of the third slide groove is connected to the lubricating oil storage cavity 11.

[0024] A locking plate 601 is fixed to one side of the sliding column 6 near the connector 12, and the other side of the sliding column 6 is hemispherical to reduce the contact area between the sliding column 6 and the push rod 4, thereby reducing wear between the push rod 4 and the sliding column 6. A slot 1201 is provided on the side of the connector 12 near the sliding column 6. The slot 1201 consists of a square groove and a cylindrical groove, and a sliding plate 13 is slidably connected inside the cylindrical groove. The surface of the sliding plate 13 is provided with anti-slip texture, which increases the friction between the sliding plate 13 and the locking plate 601 and further improves the stability of the locking plate 601. Furthermore, a third spring 14 is fixed between the side of the slide plate 13 and the side wall of the cylindrical groove. Long-term friction between the slide column 6 and the top rod 4 will reduce the service life of the slide column 6. Therefore, the slide column 6 needs to be replaced regularly to improve the continuity of the lubrication mechanism. To address this issue, this utility model adopts a detachable connection structure. During installation, the locking plate 601 on one side of the slide column 6 is inserted into the slot 1201. The locking plate 601 presses against the slide plate 13. Then, the slide column 6 is rotated 180 degrees to prevent the locking plate 601 from disengaging from the slot 1201. During disassembly and maintenance, the slide column 6 can be rotated in the opposite direction. The operation is simple and maintenance is convenient.

[0025] The square groove and the locking plate 601 are the same size, and the inner diameter of the cylindrical groove is not less than the diagonal length of the square groove, which improves the tightness between the locking plate 601 and the slot 1201, thereby improving the stability and anti-disengagement performance of the slide column 6. A slot 1202 is provided on the side of the square groove away from the locking plate 601, and the slot 1202 and the square groove are arranged in a cross shape. After rotating the slide column 6180 degrees, the locking plate 601 and the slot 1202 are engaged, which, together with the third spring 14, further improves the stability and anti-disengagement performance of the slide column 6.

[0026] The working principle of this utility model is as follows: Each time an injection molding process is completed, the cylinder assembly 5 drives the ejector rod 4 to eject the molded part. As the ejector rod 4 slides in the ejector rod groove 201, it squeezes the sliding column 6, forcing it into the first groove. At this time, the sliding column 6 squeezes the upper sliding member 8 upwards, and the upper sliding member 8 squeezes the side sliding member 9 towards the inside of the third groove, thereby squeezing the lubricating oil in the third groove through the cross-shaped opening. When the ejector rod 4 retracts, under the action of the second spring 10 and the first spring 7, the side sliding member 9, the upper sliding member 8, and the sliding column 6 return to their original positions, and the lubricating oil in the lubricating oil storage cavity 11 automatically drips until it fills the third groove. Because the cross-shaped opening is made of silicone and its diameter is set to a small diameter, it can effectively prevent the lubricating oil from leaking out of the third groove without external contact. When the force is applied, the lubricating oil in the third slide groove is difficult to seep out. A solenoid valve is installed at the connection between the upper end of the third slide groove and the lubricating oil storage chamber 11. When the injection molding mechanism is performing injection work, the solenoid valve is opened. After the injection work is completed, the solenoid valve is closed to prevent the lubricating oil from continuously seeping out when the machine is stopped. After the solenoid valve is closed, the little lubricating oil that seeps out will slowly lubricate the inner wall of the push rod slide groove 201. During installation, the locking plate 601 on one side of the slide column 6 is inserted into the slot 1201. The locking plate 601 presses the slide plate 13. Then the slide column 6 is rotated 180 degrees so that the locking plate 601 is engaged with the slot 1202 to prevent the locking plate 601 from disengaging from the slot 1201. During disassembly and maintenance, the slide column 6 can be rotated in the opposite direction.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A steel injection mold with a self-lubricating mechanism, comprising a fixed mold (1), a movable mold (2) located directly above the fixed mold (1), and an ejector rod groove (201) provided in the inner cavity of the movable mold (2), wherein an ejector rod (4) is slidably connected inside the ejector rod groove (201), and the ejector rod (4) is driven by a cylinder assembly (5), characterized in that: The top rod slide groove (201) has a first slide groove on its side wall. A slide column (6) is slidably connected inside the first slide groove. A connector (12) is provided on one side of the slide column (6), and a first spring (7) is fixed between one side of the connector (12) and the side wall of the first slide groove. The upper end face of the first slide groove is connected to a second slide groove, and an upper slide member (8) is slidably connected inside the second slide groove. Both ends of the upper slide member (8) are set as inclined planes. The side wall of the second slide groove is connected to a third slide groove, and the third slide groove... An internal sliding connection is provided with a side slide member (9). A second spring (10) is fixed between one side of the side slide member (9) and the side wall of the top rod slide groove (201). The other side of the side slide member (9) is in contact with the top of the upper slide member (8). The middle part of the third slide groove is connected to the side wall of the top rod slide groove (201). A silicone plug is provided at the connection between the middle part of the third slide groove and the side wall of the top rod slide groove (201). A cross-shaped opening is provided in the middle of the silicone plug. A lubricating oil storage cavity (11) is connected to the upper end face of the third slide groove.

2. The steel injection mold with a self-lubricating mechanism according to claim 1, characterized in that: A locking plate (601) is fixed on the side of the sliding column (6) near the connector (12). A slot (1201) is provided on the side of the connector (12) near the sliding column (6). The slot (1201) is composed of a square slot and a cylindrical slot. A sliding plate (13) is slidably connected inside the cylindrical slot. A third spring (14) is fixed between the side of the sliding plate (13) and the side wall of the cylindrical slot.

3. The steel injection mold with a self-lubricating mechanism according to claim 2, characterized in that: The square groove has the same dimensions as the snap-fit ​​plate (601), and the inner diameter of the cylindrical groove is not less than the diagonal length of the square groove.

4. The steel injection mold with a self-lubricating mechanism according to claim 2, characterized in that: A slot (1202) is provided on the side of the square groove away from the locking plate (601), and the slot (1202) and the square groove are arranged in a cross shape.

5. The steel injection mold with a self-lubricating mechanism according to claim 1, characterized in that: The other side of the sliding column (6) is set as a hemisphere.

6. The steel injection mold with a self-lubricating mechanism according to claim 2, characterized in that: The surface of the skateboard (13) is provided with anti-slip texture.

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