A vulcanizing mold with convenient demolding function
By using a cylinder-driven lifting plate unit and an adjustable ejector block structure, the problem of unstable ejection in existing vulcanizing molds has been solved, resulting in a longer service life and demolding efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HUACE RUBBER & PLASTIC TECH CO LTD
- Filing Date
- 2025-08-07
- Publication Date
- 2026-07-31
AI Technical Summary
The ejection function of existing vulcanizing molds relies on a high-precision fit structure, resulting in a short service life and instability.
It adopts a combination structure of cylinder, lifting plate unit, ejector block, limit rod and collar unit. The lifting and lowering of the ejector block is controlled by cylinder, avoiding the dependence on high precision matching and allowing the initial height of the ejector block to be adjusted.
This achieves stability and practicality in the ejection function, reduces the failure rate, and improves the service life and demolding efficiency of vulcanizing molds.
Smart Images
Figure CN224575991U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of equipment for vulcanized rubber production, and particularly relates to a vulcanizing mold with a convenient demolding function. Background Technology
[0002] Vulcanized rubber refers to a type of rubber material produced through a vulcanization process (also known as a crosslinking process). The general production method involves mixing raw rubber with a vulcanizing agent and then reacting the mixture under heating and pressure. The vulcanization mold is required in the latter step.
[0003] The common vulcanizing molds mainly consist of a lower mold and an upper mold, both of which have molding chambers. The upper mold also has a feed port. Finally, vulcanized rubber products can be formed between the lower and upper molds.
[0004] Furthermore, existing vulcanizing molds with convenient demolding functions generally have structural improvements on the lower mold. The lower mold has an ejection opening, and an ejection assembly is located below the lower mold. Finally, the ejection assembly can slightly lift the vulcanized rubber product, separating it from the lower mold for easy removal.
[0005] For example, Chinese utility model patent with authorization announcement number CN214000378U and authorization announcement date of August 20, 2021, discloses a rubber bushing vulcanizing mold with a structure that facilitates demolding. Its main structural components include: outer shell, sleeve rod, first insert rod, first spring, lower mold, first fixing block, fixing plate, ejector pin, second insert rod, second spring, second fixing block, third fixing block, upper mold, injection port, and guide rod.
[0006] The working principle and advantages of the vulcanizing mold in this utility model patent are as follows: the guide rod is inserted into the interior of the lower mold, so that the second fixing block is inserted into the interior of the guide rod. After injection molding, the guide rod moves upward, driving the second fixing block, so that the fixing plate moves upward, so that the ejector pin moves upward, and so that the ejector pin pushes out the rubber bushing, thereby improving the working efficiency of the device.
[0007] However, in actual use, the ejection function of this vulcanizing mold has at least the following problems of impracticality and instability. Specifically, its ejection function relies on the high-precision cooperation of at least four components: the second spring, the second fixing block, the guide rod, and the slot on the guide rod for engaging the second fixing block. The dimensional accuracy requirements of these four components are also high. After some of the structures wear out, the ejection function is prone to failure, resulting in a high failure rate and a relatively short effective service life. Utility Model Content
[0008] This application provides a vulcanizing mold with a convenient demolding function. The technical problem to be solved is: how to make the ejection and demolding function of the vulcanizing mold more practical and stable.
[0009] The technical solution adopted by this application to solve the above problems is: a vulcanizing mold with convenient demolding function, the structure includes a cylinder, a lower mold support column, a lifting plate unit disposed on the cylinder, an ejector block disposed on the upper surface of the lifting plate unit, a limiting rod inserted and disposed on the lifting plate unit, and a collar unit disposed on the lower surface of the lifting plate unit, screwed to the cylinder, and used to adjust the initial height of the ejector block.
[0010] A further preferred technical solution is that the lifting plate unit includes a plate body with the ejector block and the collar unit respectively provided on the upper and lower surfaces, and a limiting hole provided on the plate body for inserting the limiting rod.
[0011] A further preferred technical solution is that the collar unit includes a limiting ring disposed on the lower surface of the plate, an internal threaded ring screwed onto the cylinder shaft, and a supporting ring disposed on the upper end surface of the internal threaded ring, the annular surface of which engages with the inner annular surface of the limiting ring.
[0012] A further preferred technical solution is that the lifting plate unit further includes an enlarged hole disposed on the plate body and used for the passage of the lower mold support column.
[0013] A further preferred technical solution is that the lifting plate unit further includes a mounting groove disposed on the plate body and used for inserting the top block.
[0014] A further preferred technical solution is that the collar unit further includes an auxiliary limiting ring disposed on the limiting ring, and whose inner ring surface engages with the outer ring surface of the internal threaded ring.
[0015] A further preferred technical solution is that the collar unit further includes a fastening nut disposed on the cylinder shaft and used to clamp the internal threaded ring.
[0016] A further preferred technical solution is that the collar unit further includes an adjustment slit disposed on the limiting ring and exposed by the supporting ring for rotating and adjusting the internal threaded ring on the cylinder shaft.
[0017] A further preferred technical solution is that the collar unit further includes a force-applying slot disposed on the annular surface of the supporting ring and used to rotate the supporting ring.
[0018] A further preferred technical solution is that the height of the upper end face of the limiting rod is lower than the height of the upper end face of the lower mold support column.
[0019] The beneficial effects of this application include at least the following two points.
[0020] First, the overall structure of the cylinder indirectly controlling the lifting and lowering of the ejector block has sufficient structural stability and does not depend on the precise dimensional relationship of the details, which makes the ejection function of the vulcanizing mold relatively practical and stable.
[0021] Secondly, in this vulcanizing mold, the initial height of the ejector block is adjustable, so that it has a sufficient and suitable upper surface height compared with various ejector holes of different lower molds, ensuring effective ejection and preventing the ejector block from damaging the vulcanized rubber product, thus further improving the practicality of the vulcanizing mold. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of this application.
[0023] Figure 2 This is a schematic diagram showing the position and shape of one of the lower mold support columns in this application.
[0024] Figure 3 This is a schematic diagram of the standby state of the ejected block in this application.
[0025] Figure 4 This is a schematic diagram of the shape of the lower mold in this application.
[0026] Figure 5 This is a schematic diagram of the working state of the ejected block in this application.
[0027] Figure 6 This is a schematic diagram of the collar unit in this application.
[0028] Figure 7 This is a structural schematic diagram of the lifting plate unit in this application.
[0029] The meanings of the markings in the diagram are as follows.
[0030] Cylinder 11, cylinder shaft 11-1, lower mold support column 12, box-type outer shell 13, lower mold 14, molding chamber 15, ejection hole 16;
[0031] 1. Lifting plate unit; 2. Ejection block; 3. Limiting rod; 4. Collar unit; 5. Operating port; 6. Screw groove;
[0032] Plate 101, limiting hole 102, enlarged hole 103, mounting groove 104;
[0033] Limiting ring 401, internal threaded ring 402, supporting ring 403, auxiliary limiting ring 404, fastening nut 405, adjusting notch 406, force-applying slot 407. Detailed Implementation
[0034] The following description is merely a preferred embodiment of this application and is not intended to limit the scope of this application.
[0035] like Figures 1-7 As shown, a vulcanizing mold with convenient demolding function includes a cylinder 11 and a lower mold support column 12. It also includes a lifting plate unit 1 disposed on the cylinder 11, an ejector block 2 disposed on the upper surface of the lifting plate unit 1, a limiting rod 3 inserted and disposed on the lifting plate unit 1, and a collar unit 4 disposed on the lower surface of the lifting plate unit 1, screwed to the cylinder 11, and used to adjust the initial height of the ejector block 2.
[0036] In this embodiment, the vulcanizing mold structure further includes a box-type outer shell 13, a lower mold 14, a molding chamber 15, an ejection hole 16, and an upper mold. The general method of using this vulcanizing mold is as follows:
[0037] First, the upper mold is placed downwards onto mold 14;
[0038] Second, high-temperature and high-pressure vulcanized rubber material is injected into the feed port of the upper mold. The material enters the molding chamber 15 and initially forms a vulcanized rubber product.
[0039] Third, the upper mold is moved upwards to expose the vulcanized rubber product;
[0040] Fourth, after the vulcanized rubber product has fully cured, the cylinder 11 is opened, causing the ejector block 2 to lift the vulcanized rubber product upwards, separating it from the molding chamber 15. Finally, the operator removes the product, completing a full vulcanized rubber production operation with ejection and demolding functions.
[0041] The box-shaped outer shell 13, the lower mold support column 12, and the limiting rod 3 are integrally formed. The lower mold 14 is screwed and fixed to the lower mold support column 12. The cylinder 11 is screwed to the inner bottom surface of the box-shaped outer shell 13 through the screw groove 6. The lower mold 14 has its own forming chamber 15 and ejection hole 16. The lifting plate unit 1 is screwed to the cylinder 11 through the collar unit 4.
[0042] Specifically, the ejection assembly of the vulcanizing mold includes, for example, two cylinders 11, one lifting plate unit 1, several ejection blocks 2, several limiting rods 3, and two collar units 4. The practicality and stability advantages of this vulcanizing mold are mainly reflected in the above-mentioned ejection assembly, and at least in the following aspects:
[0043] First, there are no critical structures in the entire ejection assembly that require high-precision dimensional matching. For example, even if there is significant dimensional wear at the collar unit 4, the ejection function will still be effective.
[0044] Secondly, the effective screwing dimension of the collar unit 4 on the cylinder shaft 11-1 is adjustable, which ultimately makes the initial height of the ejector block 2 adjustable. This ensures that within a certain range, even if the lower mold 14 is replaced or the bottom height of the molding chamber 15 changes, the ejector block 2 will not suffer from the two harmful problems of insufficient lifting height and damage to the vulcanized rubber product.
[0045] It should be noted that before and during the production of vulcanized rubber products, the upper surface height of the ejector block 2 is slightly lower than the inner bottom surface height of the molding chamber 15. Therefore, at the position corresponding to the ejector hole 16 on the vulcanized rubber product, appropriate cutting operations need to be performed during the post-processing stage. Generally, the cutting waste can be recycled and reused.
[0046] The lifting plate unit 1 includes a plate body 101 with the ejector block 2 and the collar unit 4 respectively on its upper and lower surfaces, and a limiting hole 102 disposed on the plate body 101 for inserting the limiting rod 3.
[0047] In this embodiment, the main material of the vulcanizing mold is aluminum alloy, and the plate 101 is a rectangular aluminum alloy straight plate. The number, size, and position of the ejector blocks 2 on the plate 101 are determined by the specific structure of the lower mold 14.
[0048] Correspondingly, the gap size between the ejector block 2 and the ejector hole 16, and the gap size between the limiting rod 3 and the limiting hole 102 are relatively small, for example, controlled within 2mm, to ensure that the entire ejection action has further advantages of stability and high efficiency.
[0049] Furthermore, the endpoints of the upward and downward strokes of the cylinder 11 are determined by existing simple control systems, ensuring that as many of the ejector blocks 2 as possible reciprocate within a range of, for example, 1 cm above and below the upper edge of the ejector hole 16.
[0050] The collar unit 4 includes a limiting ring 401 disposed on the lower surface of the plate 101, an internal threaded ring 402 screwed onto the cylinder shaft 11-1, and a supporting ring 403 disposed on the upper end surface of the internal threaded ring 402 and whose annular surface engages with the inner annular surface of the limiting ring 401.
[0051] In this embodiment, the plate 101 and the limiting ring 401 are integrally formed, and the supporting ring 403 and the internal threaded ring 402 are integrally formed. Before and after the vulcanizing mold is used, the plate 101 is always pressed on the supporting ring 403.
[0052] In addition, the existing common cylinder 11 has a threaded section on its cylinder shaft 11-1. The internal threaded ring 402 and the above-mentioned threaded section have the function of effectively adjusting the threaded size while ensuring sufficient screw strength. This makes the initial height of the ejector block 2 adjustable, which is very practical and flexible.
[0053] Specifically, when the internal threaded ring 402 is adjusted to the effective threaded size on the cylinder shaft 11-1, the lifting plate unit 1 can be temporarily lifted away from the supporting ring 403, so that the overall structure of the supporting ring 403 and the internal threaded ring 402 is relatively easier to rotate and adjust.
[0054] The lifting plate unit 1 also includes an enlarged hole 103 disposed on the plate body 101 and used for the passage of the lower mold support column 12.
[0055] In this embodiment, the gap between the enlarged hole 103 and the lower mold support column 12 is set to be relatively large, for example, ≥8mm, to avoid harmful lateral displacement at the lower mold 14 directly acting on the lifting plate unit 1. Otherwise, the above-mentioned vibration displacement will occur intermittently over a long period of time, which will eventually reduce the accuracy of the ejection action, manifested as: significant friction will occur between the ejection block 2 and the ejection hole 16.
[0056] However, it should be noted that in order to avoid significant material leakage, the ejector block 2 and the ejector hole 16 must be connected with high precision. At this time, any lateral displacement that may occur at the lower mold 14 can be indirectly transmitted to the lifting plate unit 1 through the ejector block 2, which is unavoidable.
[0057] On the other hand, the enlarged hole 103 must also be provided, otherwise the length and width of the plate 101 will have to be relatively small, which is insufficient to install all the ejector blocks 2.
[0058] The lifting plate unit 1 also includes a mounting groove 104 disposed on the plate body 101 and used to insert the ejector block 2.
[0059] In this embodiment, the reason why the mounting slot 104 can be opened is mainly because:
[0060] First, when the ejector block 2 touches and ejects the vulcanized rubber product, the latter has been fully cured and its viscosity is generally relatively low, which is insufficient to stick the ejector block 2 and cause it to fall out of the mounting groove 104.
[0061] Secondly, the ejector block 2 is made of aluminum alloy, which is relatively heavy. Even though the vulcanized rubber product has a certain stickiness to it, it is still not enough to make it fall out of the mounting groove 104.
[0062] In addition, the main function of the mounting groove 104 is to allow the ejector block 2 to be replaced individually, which is very practical for the lower mold 14 where the height of different parts of the inner bottom surface is inconsistent. (See attached image) Figure 5 As shown, there are a total of 3 ejection holes 16. The central ejection hole 16 is suitable for pairing with a relatively long ejection block 2, while the other 2 ejection holes 16 are suitable for pairing with relatively short ejection blocks 2. This ensures that the vulcanized rubber product has sufficient and appropriate ejection strength at all 3 ejection points, avoiding harmful phenomena such as insufficient ejection effect or excessive ejection strength.
[0063] When the ejector block 2 of the same height is integrally formed on the plate 101, the above-mentioned beneficial effects cannot be achieved, which is why the mounting groove 104 is provided.
[0064] The collar unit 4 also includes an auxiliary limiting ring 404 disposed on the limiting ring 401, and whose inner ring surface engages with the outer ring surface of the internal threaded ring 402.
[0065] In this embodiment, the plate 101 needs to avoid lateral displacement, which is achieved through the following engagement points:
[0066] First, the limiting hole 102 and the limiting rod 3 are inserted together and fully fit together;
[0067] Second, the limiting ring 401 and the supporting ring 403 are inserted together and fully fit together.
[0068] The auxiliary limiting ring 404 serves to add another engagement point, making the plate 101 more laterally stable compared to the limiting rod 3 and the cylinder 11, which are two fixed structures.
[0069] The collar unit 4 also includes a fastening nut 405 disposed on the cylinder shaft 11-1 and used to clamp the internal threaded ring 402.
[0070] In this embodiment, when the height of the internal threaded ring 402 is adjusted on the cylinder shaft 11-1, it separates from the fastening nut 405. After the height of the internal threaded ring 402 is adjusted, it is first fixed, and then the fastening nut 405 is rotated to clamp it, thus completing the entire lifting and lowering adjustment operation of the collar unit 4.
[0071] When the collar unit 4 includes an auxiliary limiting ring 404, the fastening nut 405 is located below and exposed under the auxiliary limiting ring 404.
[0072] The collar unit 4 also includes an adjustment notch 406 disposed on the limiting ring 401 and exposed by the support ring 403, for rotating and adjusting the internal threaded ring 402 on the cylinder shaft 11-1.
[0073] In this embodiment, the main function of the adjustment notch 406 is to allow the operator to touch and rotate the internal threaded ring 402, making the lifting and lowering adjustment of the internal threaded ring 402 more effective and convenient than that of the cylinder shaft 11-1.
[0074] When the collar unit 4 also includes the auxiliary limiting ring 404, the adjusting slit 406 can also be simultaneously formed on the auxiliary limiting ring 404. However, the opening size of the adjusting slit 406 should not be too large, so as not to significantly reduce the structural strength of the collar unit 4.
[0075] The collar unit 4 further includes a force-applying slot 407 disposed on the annular surface of the support ring 403 and used to rotate the support ring 403.
[0076] In this embodiment, the number of force-applying slots 407 is ≥10, and they are evenly distributed in the circumferential direction of the support ring 403. Tools such as screwdrivers can be inserted into the force-applying slots 407, or the friction between the slots and the operator's fingers can be increased, which makes the rotation of the support ring 403 more convenient and efficient.
[0077] On the other hand, the force-applying slot 407 is recessed in the radial direction of the support ring 403, so it does not affect the full fit between the support ring 403 and the limiting ring 401.
[0078] The height of the upper end face of the limiting rod 3 is lower than the height of the upper end face of the lower mold support column 12.
[0079] In this embodiment, the upper end of the limiting rod 3 is separated from the lower mold 14. When the upper mold is fastened to the lower mold 14, the small vibration of the latter is not easily transmitted to the lifting plate unit 1, which at least ensures the structural stability of the cylinder 11, the lifting plate unit 1 and the limiting rod 3. The original gap between the ejector block 2 and the ejector hole 16 can appropriately block the above vibration.
[0080] In addition, the box-type outer shell 13 is also provided with the operation port 5, which, together with the adjustment slit 406, makes the rotation adjustment operation of the support ring 403 simpler and more convenient.
[0081] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this application. These are non-inventive modifications and are protected by patent law as long as they are within the scope of the claims of this application.
Claims
1. A vulcanizing mold with convenient demolding function, comprising a cylinder (11) and a lower mold support column (12), characterized in that: It also includes a lifting plate unit (1) disposed on the cylinder (11), an ejector block (2) disposed on the upper surface of the lifting plate unit (1), a limiting rod (3) inserted on the lifting plate unit (1), and a collar unit (4) disposed on the lower surface of the lifting plate unit (1), screwed to the cylinder (11), and used to adjust the initial height of the ejector block (2).
2. The vulcanization mold having a convenient demolding function according to claim 1, characterized by: The lifting plate unit (1) includes a plate body (101) with the ejector block (2) and the collar unit (4) respectively on the upper and lower surfaces, and a limiting hole (102) provided on the plate body (101) for inserting the limiting rod (3).
3. The vulcanization mold having a convenient demolding function according to claim 2, characterized in that: The collar unit (4) includes a limiting ring (401) disposed on the lower surface of the plate (101), an internal thread ring (402) screwed onto the cylinder shaft (11-1), and a supporting ring (403) disposed on the upper end surface of the internal thread ring (402) and whose annular surface engages with the inner annular surface of the limiting ring (401).
4. The vulcanization mold having a convenient demolding function according to claim 2, characterized in that: The lifting plate unit (1) also includes an enlarged hole (103) disposed on the plate body (101) and used for the passage of the lower mold support column (12).
5. The vulcanization mold having a convenient demolding function according to claim 2, characterized in that: The lifting plate unit (1) also includes a mounting groove (104) disposed on the plate body (101) and used to insert the ejector block (2).
6. The vulcanization mold having a convenient demolding function according to claim 3, characterized in that: The collar unit (4) further includes an auxiliary limiting ring (404) disposed on the limiting ring (401) and whose inner ring surface engages with the outer ring surface of the internal threaded ring (402).
7. The vulcanization mold having a convenient demolding function according to claim 3, characterized in that: The collar unit (4) also includes a fastening nut (405) disposed on the cylinder shaft (11-1) and used to clamp the internal threaded ring (402).
8. The vulcanization mold having a convenient demolding function according to claim 3, characterized by: The collar unit (4) also includes an adjustment cutout (406) disposed on the limiting ring (401) and exposed by the support ring (403) for rotating and adjusting the internal threaded ring (402) on the cylinder shaft (11-1).
9. The vulcanization mold having a convenient demolding function according to claim 8, characterized by: The collar unit (4) further includes a force-applying slot (407) disposed on the annular surface of the support ring (403) and used to rotate the support ring (403).
10. The vulcanization mold having a convenient demolding function according to claim 1, characterized by: The height of the upper end face of the limiting rod (3) is lower than the height of the upper end face of the lower mold support column (12).