Rubber part mold with automatic demolding function
By designing an oil storage cavity, ball bearings, and liquid level monitoring components for an automatic demolding rubber part mold, the problem of uneven ejector pin lubrication was solved, enabling automatic ejector pin lubrication and real-time monitoring of lubricating oil, thereby improving the stability of the mold and the molding quality of the rubber parts.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIUZHOU HENGJUN PARTS MFG CO LTD
- Filing Date
- 2025-02-24
- Publication Date
- 2026-05-05
AI Technical Summary
In existing rubber part molds, there is a lack of lubrication between the ejector pins and the ejector pin grooves, resulting in uneven lubrication. This leads to severe wear of the ejector pins, affecting the smoothness of demolding and the molding quality of the rubber parts, and increasing production costs.
An automatic demolding rubber part mold was designed, which adopts a cooperative structure of oil storage cavity, ball bearing, spring and ejector pin to realize automatic lubrication function, and the lubricating oil level is monitored in real time by liquid level monitoring component to ensure uniform application and timely replenishment of lubricating oil.
It achieves automatic lubrication between the ejector pin and the ejector pin groove, reduces friction and wear, extends the service life of the ejector pin, reduces mold maintenance costs, and ensures long-term stable operation of the mold and the molding quality of rubber parts.
Smart Images
Figure CN224197127U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold technology, and in particular to an automatic demolding rubber part mold. Background Technology
[0002] In the mold manufacturing industry, rubber part molds are a type of mold specifically designed for producing rubber products. They integrate various ingenious designs to achieve an efficient production process. Early rubber part molds suffered from numerous problems with ejector pin lubrication. Taking traditional, simple rubber molds as an example, they typically only had a basic ejector pin structure.
[0003] During the actual use of the mold, the operator needs to manually apply lubricating oil to the ejector pins periodically. First, the mold operation must be stopped, the relevant protective devices of the mold must be opened, the ejector pin area must be located, and after applying lubricating oil with a special tool, it must be carefully applied to the contact surface between the ejector pin and the ejector pin groove.
[0004] Existing lubrication methods are not only labor-intensive and time-consuming, but also prone to problems due to the difficulty in ensuring uniform application with manual operation. This results in some ejector pin areas having excessive lubricant, causing oil droplets to drip and contaminate the mold and surrounding working environment, while other areas have insufficient lubrication. This leads to high friction between the ejector pins and their grooves, causing severe wear and frequent replacements over time, increasing production costs. Furthermore, the poor demolding caused by ejector pin wear affects the molding quality of the rubber parts and reduces production efficiency. Therefore, an automatic demolding rubber part mold is proposed to solve these problems. Utility Model Content
[0005] To overcome the above deficiencies, this utility model provides an automatic demolding rubber part mold, which aims to improve the problems of lack of lubrication and uneven lubrication between the ejector pin and the ejector pin groove in the prior art.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: an automatic demolding rubber part mold, comprising a lower mold and an upper mold, wherein a forming groove is provided on the top of the lower mold, a punch is fixedly connected to the bottom of the upper mold, a retractable guide rod is fixedly connected through the top of the lower mold, the telescopic end of the retractable guide rod is fixedly connected to the bottom of the upper mold, an ejector pin groove is provided on the bottom of the forming groove, an ejector pin is slidably connected to the groove wall of the ejector pin groove, the top end of the ejector pin extends into the forming groove, a first spring is fixedly connected to the bottom of the ejector pin groove, the top end of the first spring is fixedly connected to the bottom of the ejector pin, an oil storage cavity is provided inside the lower mold, a second spring is provided in the groove of the oil storage cavity, a ball is fixedly connected to one end of the second spring, and the other end of the second spring is fixedly connected to the groove wall of the oil storage cavity.
[0007] As a further description of the above technical solution: a liquid level monitoring component is provided on the lower mold, the liquid level monitoring component includes a limiting sleeve, the surface of the limiting sleeve is provided with a sliding hole, a movable rod is movably connected through the top of the lower mold, the surface of the movable rod contacts the inner side of the limiting sleeve, the bottom end of the movable rod extends into the oil storage cavity, and a float is fixedly connected to the bottom end of the movable rod.
[0008] As a further description of the above technical solution: there are four ejector pins and four ejector pin slots, and the four ejector pins and four ejector pins are symmetrically distributed at equal intervals at the bottom of the molding groove.
[0009] As a further description of the above technical solution: the oil storage cavity is annular, and an oil seepage hole is provided between the oil storage cavity and the ejector pin groove, and the surface of the ball is in contact with the hole wall of the oil seepage hole.
[0010] As a further description of the above technical solution: the interior of the oil storage cavity is filled with lubricating oil, and the float is located on the surface of the lubricating oil.
[0011] As a further description of the above technical solution: the limiting sleeve is fixedly connected to the edge of the sliding hole with a scale line, and the outer surface of the top end of the movable rod is fixedly connected to a pointer, the outer wall of the pointer being in contact with and slidably connected to the wall of the sliding hole.
[0012] As a further description of the above technical solution: the bottom of the upper mold is provided with a storage groove, the size of which is adapted to the limiting sleeve.
[0013] As a further description of the above technical solution: the surface of the ejector pin is provided with an arc-shaped groove, and the surface of the ball abuts against the groove wall of the arc-shaped groove.
[0014] This utility model has the following beneficial effects:
[0015] 1. In this utility model, the automatic lubrication function is realized through the cooperation between the oil storage cavity, ball bearing, spring and ejector pin. During the rubber molding process, the movement of the ejector pin can automatically trigger the lubricating oil to flow from the oil storage cavity into the ejector pin groove. This not only reduces the friction and wear between the ejector pin and the ejector pin groove, but also evenly applies the lubricating oil when the ejector pin returns to its original position, continuously maintaining a good lubrication state, effectively extending the service life of the ejector pin, reducing the mold maintenance cost, and ensuring the long-term stable operation of the mold.
[0016] 2. In this utility model, the liquid level monitoring component, through the coordinated operation of the float, movable rod, pointer, limit sleeve and scale line, can accurately monitor the lubricating oil level in the oil storage cavity in real time. Based on this, the operator can promptly grasp the remaining lubricating oil and replenish it as needed, ensuring the continuous effectiveness of the mold lubrication system and avoiding accelerated wear of components due to lack of oil. Attached Figure Description
[0017] Figure 1 This is a front view of an automatic demolding rubber part mold proposed in this utility model;
[0018] Figure 2 This is a schematic diagram of the upper mold of an automatic demolding rubber part mold proposed in this utility model;
[0019] Figure 3 This is a schematic diagram of the lower mold of an automatic demolding rubber part mold proposed in this utility model;
[0020] Figure 4 This is a top sectional view of the lower mold of an automatic demolding rubber part mold proposed in this utility model;
[0021] Figure 5 This is a front sectional view of the lower mold of an automatic demolding rubber part mold proposed in this utility model;
[0022] Figure 6 This is a schematic diagram of the ejector pin of the lower mold of an automatic demolding rubber part mold proposed in this utility model.
[0023] Figure 7 This is a schematic diagram of the liquid level monitoring component of the lower mold of an automatic demolding rubber part mold proposed in this utility model.
[0024] Legend:
[0025] 1. Lower mold; 2. Upper mold; 3. Telescopic guide rod; 4. Punch; 5. Storage groove; 6. Forming groove; 7. Ejector pin; 8. Arc groove; 9. Spring No. 1; 10. Oil storage cavity; 11. Spring No. 2; 12. Ball bearing; 13. Limit sleeve; 14. Movable rod; 15. Pointer; 16. Float ball. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] Reference Figure 1 - Figure 3This utility model provides an embodiment of an automatic demolding rubber part mold, comprising a lower mold 1 and an upper mold 2. The lower mold 1, as the lower half of the mold, provides a stable foundation support for the entire rubber molding process. A molding groove 6 on its top precisely defines the final outline of the rubber part. A punch 4 is fixedly connected to the bottom of the upper mold 2. The punch 4 at the bottom of the upper mold 2 cooperates with the molding groove 6 of the lower mold 1, compressing the rubber material placed in the molding groove 6 during mold closing, filling all corners of the molding groove 6, and completing the shaping of the rubber part. A retractable guide rod 3 is fixedly connected through the top of the lower mold 1. The retractable end of the retractable guide rod 3 is fixedly connected to the bottom of the upper mold 2. The retractable guide rod 3 not only connects the upper and lower molds, but more importantly, guides the upper mold 2 to move precisely along a predetermined direction during mold opening and closing, ensuring the accuracy of each mold closing. Simultaneously, its retractable function can adapt to some minor positional changes of the mold during opening and closing. To prevent damage to the mold due to rigid collisions, the bottom of the molding groove 6 is provided with ejector pin grooves. There are four ejector pins and four ejector pin grooves, which are symmetrically distributed at equal intervals on the bottom of the molding groove 6. The four equally spaced and symmetrically distributed ejector pin grooves and ejector pins 7 can apply an upward thrust to the rubber part from multiple directions after the rubber part is molded, ensuring that the rubber part is demolded smoothly and steadily, and avoiding deformation or damage to the rubber part due to uneven demolding force. The ejector pins 7 are slidably connected to the groove walls of the ejector pin grooves. The top of the ejector pin 7 extends into the molding groove 6. A first spring 9 is fixedly connected to the bottom of the ejector pin groove. The top of the first spring 9 is fixedly connected to the bottom of the ejector pin 7. During the rubber molding process, when the punch 4 is pressed down, the ejector pin 7 is forced to compress the first spring 9 downward, so that the top surface of the ejector pin 7 is flush with the bottom of the molding groove 6, preventing the ejector pin 7 from affecting the normal molding of the rubber. After the rubber is molded and cooled, the first spring 9 releases its elastic potential energy, pushes the ejector pin 7 upward, and ejects the rubber part out of the molding groove 6, realizing the automatic demolding function.
[0028] Reference Figure 4 , Figure 5 , Figure 6The lower mold 1 has an oil storage cavity 10 inside, which stores lubricating oil to provide lubrication for the moving parts of the mold, reduce frictional resistance between parts, and extend the service life of the mold. A second spring 11 is installed in the groove of the oil storage cavity 10. One end of the second spring 11 is fixedly connected to a ball 12. The structure formed by the second spring 11 and the ball 12 cleverly controls the flow path of the lubricating oil. The other end of the second spring 11 is fixedly connected to the groove wall of the oil storage cavity 10. The oil storage cavity 10 is annular. An oil seepage hole is opened between the oil storage cavity 10 and the ejector pin groove. The surface of the ball 12 contacts the wall of the oil seepage hole. An arc-shaped groove 8 is opened on the surface of the ejector pin 7. The surface of the ball 12 contacts the groove of the arc-shaped groove 8. In normal mold conditions, the ball bearing 12, under the elastic force of the second spring 11, tightly blocks the oil leakage hole to prevent lubricating oil leakage and ensure that the lubricating oil in the oil storage cavity 10 is always in a stored state. When the ejector pin 7 moves up and down, the relative position of the arc groove 8 on the surface of the ejector pin 7 and the ball bearing 12 changes. During the downward movement of the ejector pin 7, the ball bearing 12 moves towards the inside of the oil storage cavity 10 under the pressure of the arc groove 8, and the oil leakage hole is opened. The lubricating oil in the oil storage cavity 10 flows into the ejector groove along the oil leakage hole, providing lubrication for the sliding friction between the ejector pin 7 and the ejector groove and reducing wear. When the ejector pin 7 moves upward and returns to its original position, the ball bearing 12, under the action of the second spring 11, blocks the oil leakage hole again to maintain the stored state of the lubricating oil.
[0029] Reference Figure 7A liquid level monitoring assembly is installed on the lower mold 1. The liquid level monitoring assembly includes a limiting sleeve 13, on the surface of which a sliding hole is formed. A scale line is fixedly connected to the edge of the sliding hole on the limiting sleeve 13. A pointer 15 is fixedly connected to the outer surface of the top of the movable rod 14. The outer wall of the pointer 15 contacts and slides against the wall of the sliding hole. The sliding hole limits the movement trajectory of the pointer 15. The scale line provides an intuitive reference standard for judging the liquid level. A movable rod 14 is movably connected through the top of the lower mold 1. The surface of the movable rod 14 contacts the inner side of the limiting sleeve 13. The limiting sleeve 13 serves as the outer shell of the entire monitoring assembly, providing a mounting base for the movable rod 14. The bottom end of the movable rod 14 extends into the oil storage cavity 10. A float ball 16 is fixedly connected to the bottom end of the movable rod 14. The interior is filled with lubricating oil, and the float 16 is located on the surface of the lubricating oil. The movable rod 14 connects the float 16 and the pointer 15. As the level of the lubricating oil in the oil storage chamber 10 rises and falls, the float 16 moves up and down accordingly, driving the movable rod 14 to move synchronously, which in turn causes the pointer 15 to slide in the sliding hole. By observing the position of the scale line indicated by the pointer 15, the operator can quickly know the remaining amount of lubricating oil in the oil storage chamber 10, so as to replenish the lubricating oil in time and ensure the normal operation of the mold lubrication system. The bottom of the upper mold 2 is provided with a storage groove 5. The size of the storage groove 5 is adapted to the limiting sleeve 13. When the mold is closed, the storage groove 5 at the bottom of the upper mold 2 can accommodate the limiting sleeve 13, so as to avoid the liquid level monitoring component being damaged by collision during the mold closing process, while ensuring the compactness of the overall mold structure.
[0030] Working principle: Heated rubber is placed in the molding groove 6 of the lower mold 1. Then, the telescopic guide rod 3 is activated, causing the telescopic end of the telescopic guide rod 3 to move the upper mold 2 downward. The punch 4 at the bottom of the upper mold 2 enters the molding groove 6, and the punch 4 squeezes the ejector pin 7 to move downward in the ejector pin groove. The downward-moving ejector pin 7 squeezes the first spring 9, keeping the top surface of the ejector pin 7 parallel to the bottom of the molding groove 6. The ejector pin 4 squeezes and shapes the rubber. As the ejector pin 7 moves downward in the ejector pin groove, it separates from the ball bearing 12 under the action of the arc groove 8. The ball bearing 12 then moves towards the inside of the oil storage cavity 10. At this time, the oil seepage hole between the ejector pin groove and the oil storage cavity 10 is opened, and the lubricating oil in the oil storage cavity 10 flows into the ejector pin groove after passing through the oil seepage hole. After the rubber in the molding groove 6 is shaped, it is released through the first spring 9. The longitudinal elastic potential energy of spring 9 drives ejector pin 7 to move upward. With the upward movement of ejector pin 7, lubricating oil is evenly applied to the gap between ejector pin 7 and ejector pin groove, improving the service life of ejector pin 7. As the level of lubricating oil in oil storage cavity 10 rises and falls, float ball 16 moves up and down accordingly, driving movable rod 14 to move synchronously, thereby causing pointer 15 to slide in sliding hole. By observing the position of the scale line pointed to by pointer 15, the operator can quickly know the remaining amount of lubricating oil in oil storage cavity 10, so as to replenish lubricating oil in time and ensure the normal operation of mold lubrication system. After the rubber part cools down, the retractable guide rod 3 is activated in reverse, causing the retractable guide rod 3 to drive the upper mold 2 to move upward. With the longitudinal elastic potential energy of spring 9, ejector pin 7 is driven upward to push out the molded rubber model, and the molded rubber model can be taken out.
[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An automatic demolding rubber part mold, comprising a lower mold (1) and an upper mold (2), characterized in that: The lower mold (1) has a forming groove (6) at its top. The upper mold (2) has a punch (4) fixedly connected to its bottom. The lower mold (1) has a telescopic guide rod (3) fixedly connected through it. The telescopic end of the telescopic guide rod (3) is fixedly connected to the bottom of the upper mold (2). The bottom of the forming groove (6) has an ejector pin groove. The wall of the ejector pin groove is in contact with and slidably connected to an ejector pin (7). The top of the ejector pin (7) extends into the forming groove (6). The bottom of the ejector pin groove is fixedly connected to a first spring (9). The top of the first spring (9) is fixedly connected to the bottom of the ejector pin (7). The lower mold (1) has an oil storage cavity (10) inside. A second spring (11) is provided in the groove of the oil storage cavity (10). One end of the second spring (11) is fixedly connected to a ball (12). The other end of the second spring (11) is fixedly connected to the groove wall of the oil storage cavity (10).
2. The automatic demolding rubber part mold according to claim 1, characterized in that: The lower mold (1) is provided with a liquid level monitoring component, which includes a limiting sleeve (13). The surface of the limiting sleeve (13) is provided with a sliding hole. The top of the lower mold (1) is movably connected to a movable rod (14). The surface of the movable rod (14) contacts the inner side of the limiting sleeve (13). The bottom end of the movable rod (14) extends into the oil storage cavity (10). The bottom end of the movable rod (14) is fixedly connected to a float ball (16).
3. The automatic demolding rubber part mold according to claim 1, characterized in that: The number of ejector pins and ejector pin slots are four, and the four ejector pins and ejector pins are symmetrically distributed at equal intervals at the bottom of the molding groove (6).
4. The automatic demolding rubber part mold according to claim 1, characterized in that: The oil storage cavity (10) is annular, and an oil seepage hole is provided between the oil storage cavity (10) and the ejector pin groove. The surface of the ball (12) is in contact with the hole wall of the oil seepage hole.
5. The automatic demolding rubber part mold according to claim 2, characterized in that: The oil storage chamber (10) is filled with lubricating oil, and the float (16) is located on the surface of the lubricating oil.
6. The automatic demolding rubber part mold according to claim 2, characterized in that: The limiting sleeve (13) is fixedly connected to the edge of the sliding hole with a scale line, and the top outer surface of the movable rod (14) is fixedly connected to a pointer (15). The outer wall of the pointer (15) is in contact with the wall of the sliding hole and is slidably connected.
7. The automatic demolding rubber part mold according to claim 1, characterized in that: The bottom of the upper mold (2) is provided with a storage groove (5), the size of which is adapted to the limiting sleeve (13).
8. The automatic demolding rubber part mold according to claim 1, characterized in that: The surface of the ejector pin (7) is provided with an arc-shaped groove (8), and the surface of the ball (12) abuts against the groove wall of the arc-shaped groove (8).