Molds and production methods for producing circular or arc-shaped rubber sealing strips

Abstract

This invention relates to the technical field of mechanical molds. By modifying the production mold and its production process, rubber strips of any cross-sectional shape can be extruded and spatially bent into circular or arc-shaped rubber sealing strips. The production mold for spatially bent circular or arc-shaped rubber sealing strips includes a composite extrusion mold head. The composite extrusion mold includes a first mold, a second mold, a third mold, and a fourth mold fixed in sequence; the first mold, second mold, third mold, and fourth mold are provided with composite flow channels for creating a flow rate difference in the fluid rubber, thereby shaping the rubber sealing strip into a spatial circular or arc-shaped form. This invention, through the design of the composite flow channels in the extrusion mold head, creates a flow rate difference between the left and right cross-sections of the extruded rubber sealing strip, enabling rubber sealing strips of any cross-sectional shape to be extruded into a predetermined spatial circular or arc-shaped form. This significantly improves the production efficiency of spatially bent circular or arc-shaped rubber sealing strips while reducing mold investment costs.

Description

Technical Field

[0001] This invention relates to the technical field of mechanical molds, and more specifically, to a mold and production method for producing rubber sealing strips that are bent into circular or arc shapes. Background Technology

[0002] The performance of rubber sealing strips is an important indicator for large machinery, wind turbines, and other applications. As an integral part of the overall sealing structure, rubber sealing strips are a crucial component. In the installation space of large wind turbines and construction machinery, the curved circular sealing strips serve to prevent oil, water, dust, and provide sound insulation and noise reduction.

[0003] Currently, domestic and foreign rubber sealing strip production lines can only produce spatial linear rubber strips.

[0004] In existing technologies, large, curved, spatially circular sealing strips are mostly produced by molding multiple segments of rubber material. Then, depending on the required bending diameter, each segment is joined together using cold bonding or molding to form a single spatially circular sealing strip. This manufacturing process is inefficient, costly, and requires large molds; even larger molds are needed for extra-large spatially curved circular strips, thus hindering the normal production of large sealing strips. During installation, starting from one point on the mold track, the circular sealing strip is wrapped around the track. Different track sizes require the development of sealing strip forming molds of different shapes, resulting in low production efficiency and high costs. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a mold and method for producing rubber sealing strips that are bent into a circular or arc shape in space. The composite flow channel of the extrusion die head creates a flow rate difference across the cross section of the extruded rubber sealing strip, thereby forming a predetermined spatial circular or arc shape for the rubber sealing strip. This improves the production efficiency of the rubber sealing strip and reduces production costs.

[0006] The technical solution of the present invention is: a mold for producing a circular or arc-shaped rubber sealing strip, wherein the mold includes a composite extrusion mold head, and the composite extrusion mold head includes a first mold, a second mold, a third mold, and a fourth mold fixed in sequence;

[0007] The first mold, second mold, third mold, and fourth mold are provided with composite flow channels for creating a flow rate difference in the fluid rubber to shape the rubber sealing strip into a spatial circular or arc shape.

[0008] Currently, the main domestic and international processes for molding circular or arc-shaped rubber sealing strips involve large-scale molding, segmented vulcanization, and then joining the segments together to form a sealing ring. This process suffers from low production efficiency, high mold costs, and the requirement for large and specialized equipment. (Especially for circular sealing strips with large bending diameters, which require multiple segments to be spliced ​​together, resulting in high production costs.)

[0009] In this invention, the design of the composite flow channel in the extrusion die head creates a flow velocity difference between the left and right cross sections of the extruded rubber sealing strip, and the rubber sealing strip forms a predetermined spatial circle or arc shape, which greatly improves the production efficiency of the spatially bent circular or arc rubber sealing strip, while also reducing the cost of mold investment.

[0010] Specifically, the first mold includes a first injection port, a second injection port, and a third injection port, wherein the first injection port is located in the middle of the first mold;

[0011] The second and third injection ports of the first mold are respectively located at the edge of the first mold.

[0012] Specifically, the second mold includes a first inlet, a second inlet, and a third inlet, wherein the first inlet is located in the middle of the second mold.

[0013] The second mold's second inlet and third inlet are respectively located at the edge of the second mold;

[0014] The first inlet of the second mold is connected to the first injection port of the first mold, the second inlet of the second mold is connected to the second injection port of the first mold, and the third inlet of the second mold is connected to the third injection port of the first mold.

[0015] Specifically, the third mold includes a third mold first channel, a third mold second channel, and a third mold third channel; the third mold first channel is located in the middle of the third mold;

[0016] The second channel of the third mold and the third channel of the third mold are respectively located at the edge of the third mold;

[0017] The first channel of the third mold is connected to the first inlet of the second mold, the second channel of the third mold is connected to the second inlet of the second mold, and the third channel of the third mold is connected to the third inlet of the second mold.

[0018] Specifically, the fourth mold includes a fourth mold outlet located in the middle of the fourth mold; the fourth mold outlet is connected to the first channel of the third mold;

[0019] The fourth mold outlet includes a high-flow-rate outlet section and a low-flow-rate outlet section; the high-flow-rate outlet section and the low-flow-rate outlet section are located on opposite sides of the fourth mold outlet.

[0020] More preferably, the composite flow channel is composed of a first injection port of the first mold, a second injection port of the first mold, a third injection port of the first mold, a first inlet of the second mold, a second inlet of the second mold, a third inlet of the second mold, a first channel of the third mold, a second channel of the third mold, a third channel of the third mold, and an outlet of the fourth mold.

[0021] In this invention, the composite flow channel creates a flow rate difference between the left and right cross sections of the extruded sealing strip, and the rubber sealing strip forms a predetermined spatial circle or arc shape.

[0022] More preferably, the edges of the first mold, second mold, third mold, and fourth mold are respectively provided with a plurality of positioning holes and mounting holes. The composite extrusion die head also includes a plurality of pins and screws, which are used to fix the first mold, second mold, third mold, and fourth mold together. In this invention, the first mold, second mold, third mold, and fourth mold can be assembled together simply and quickly using pins and screws.

[0023] More preferably, the composite extrusion die head is further provided with mounting grooves on both sides. These mounting grooves can be used with other components to fix the composite extrusion die head in the desired position.

[0024] More preferably, the outer contours of the first mold, the second mold, the third mold, and the fourth mold are all circular.

[0025] The production method of the aforementioned mold for producing spatially bent circular or arc-shaped rubber sealing strips includes the following steps:

[0026] S1. Input the rubber raw material into the extruder;

[0027] S2. The rubber in a hot viscous fluid state enters the composite extrusion die head and passes through the composite flow channel formed by the first die, the second die, the third die, and the fourth die in sequence. The rubber sealing strip, shaped into a spatial circle or arc, is output from the composite extrusion die head.

[0028] S3. The rubber sealing strip, which is bent into a circle or arc shape, enters the vulcanization equipment for vulcanization, and finally forms the finished rubber sealing strip.

[0029] Compared with the prior art, the beneficial effects are: the present invention, through the design of the composite flow channel of the extrusion die head, creates a flow velocity difference between the left and right cross sections of the extruded rubber sealing strip, and the rubber sealing strip forms a predetermined spatial circle or arc shape, which greatly improves the production efficiency of the spatially bent circular or arc rubber sealing strip, while also reducing the cost of mold investment.

[0030] The production mold for spatially bending rubber sealing strips into circles or arcs according to the present invention improves production efficiency, reduces costs, and speeds up production. It also ensures that large spatially bent circular sealing strips require only one interface, which reduces the number of failure points in the sealing system and improves the overall stability of the product.

[0031] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall extrusion state of the present invention.

[0033] Figure 2 This is a schematic diagram of the overall composite extrusion die head of the present invention.

[0034] Figure 3 This is a first exploded schematic diagram of the composite extrusion die head of the present invention.

[0035] Figure 4 This is a second exploded schematic diagram of the composite extrusion die head of the present invention.

[0036] Figure 5 This is a schematic diagram of the dispensing direction of the third mold of the present invention.

[0037] Figure 6 This is a first overall schematic diagram of the rubber sealing strip of the present invention during extrusion.

[0038] Figure 7 This is a second schematic diagram of the rubber sealing strip of the present invention during extrusion.

[0039] Figure 8 This is a schematic diagram of the production process of the present invention. Detailed Implementation

[0040] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to their structure and are relative concepts. Therefore, they may vary depending on their location and usage. Consequently, these or other directional terms should not be interpreted as restrictive.

[0041] The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of embodiments consistent with some aspects of this disclosure.

[0042] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used herein are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0043] like Figure 1-4 As shown, a mold for producing a rubber sealing strip that is bent into a circle or arc shape includes a composite extrusion mold head 100, which includes a first mold 1, a second mold 2, a third mold 3, and a fourth mold 4 fixed in sequence.

[0044] The first mold 1, the second mold 2, the third mold 3, and the fourth mold 4 are equipped with composite flow channels for creating a flow rate difference in the fluid rubber, thereby shaping the rubber sealing strip into a circular or arc shape in space.

[0045] In this embodiment, the design of the composite flow channel in the extrusion die head creates a flow velocity difference between the left and right cross sections of the extruded rubber sealing strip, and the rubber sealing strip forms a predetermined spatial circle or arc shape, which greatly improves the production efficiency of the circle or arc rubber sealing strip, while also reducing the cost of investing in the mold.

[0046] Specifically, in this embodiment, the rubber sealing strip is formed sequentially through the first mold 1, the second mold 2, the third mold 3, and the fourth mold 4. Among these processes... Figure 3 and Figure 4 The arrows all indicate the extrusion direction of the rubber sealing strip.

[0047] Specifically, such as Figure 1-4 middle:

[0048] The first mold 1 includes a first injection port 11, a second injection port 12, and a third injection port 13. The first injection port 11 is located in the middle of the first mold 1.

[0049] The second injection port 12 and the third injection port 13 of the first mold are respectively located at the edge of the first mold 1.

[0050] In this embodiment, the first injection port 11 of the first mold is the main injection port, which is relatively large and heart-shaped. The second injection port 12 and the third injection port 13 of the first mold are distributed at the edge of the first mold 1. Both the second injection port 12 and the third injection port 13 of the first mold are straight lines, and the length of the second injection port 12 is greater than the length of the third injection port 13.

[0051] Specifically, the second mold 2 includes a first injection port 21, a second injection port 22, and a third injection port 23. The first injection port 21 is located in the middle of the second mold 2.

[0052] The second mold's second inlet 22 and the second mold's third inlet 23 are respectively located at the edge of the second mold 2;

[0053] The first inlet 21 of the second mold is connected to the first injection port 11 of the first mold, the second inlet 22 of the second mold is connected to the second injection port 12 of the first mold, and the third inlet 23 of the second mold is connected to the third injection port 13 of the first mold.

[0054] In this embodiment, the first injection port 21 of the second mold is also similar to a heart-shaped structure, but its size is smaller than the first injection port 11 of the first mold. The second injection port 22 and the third injection port 23 of the second mold are both similar to arc-shaped structures, and the second injection port 22 of the second mold is longer and the third injection port 23 of the second mold is shorter.

[0055] Specifically, the third mold 3 includes a first channel 31, a second channel 32, and a third channel 33; the first channel 31 is located in the middle of the third mold 3.

[0056] The second channel 32 and the third channel 33 of the third mold are respectively located at the edge of the third mold 3;

[0057] The first channel 31 of the third mold is connected to the first inlet 21 of the second mold, the second channel 32 of the third mold is connected to the second inlet 22 of the second mold, and the third channel 33 of the third mold is connected to the third inlet 23 of the second mold.

[0058] In this embodiment, as Figure 4 In the middle, the first channel 31 of the third mold is somewhat similar to a "V" shape. The overall outer contour dimension of the first channel 31 of the third mold is smaller than that of the first gate 21 of the second mold. The second channel 32 of the third mold is an arc-shaped structure shorter than the second gate 22 of the second mold, and the third channel 33 of the third mold is also an arc-shaped structure shorter than the third gate 23 of the second mold. In addition, Figure 4 In the middle, the injection port direction of the third mold 3 has the third mold first channel 31, the third mold second channel 32, and the third mold third channel 33. However, as Figure 5 In the middle, from the direction of the glue discharge of the third mold 3, because of the internal arrangement of the third mold 3, the third mold stepped layer structure 34 is provided in the second channel 32 and the third channel 33 of the third mold. The fluid rubber that passes through the second channel 32 and the third channel 33 of the third mold gathers towards the middle.

[0059] Specifically, such as Figure 1-5 In the middle, the fourth mold 4 includes a fourth mold outlet 41 located in the middle of the fourth mold; the fourth mold outlet 41 is connected to the first channel 31 of the third mold;

[0060] The fourth mold outlet 41 includes a high-flow-rate outlet section 41a and a low-flow-rate outlet section 41b; the high-flow-rate outlet section 41a and the low-flow-rate outlet section 41b are located on opposite sides of the fourth mold outlet.

[0061] In this embodiment, the fluid rubber passing through the second channel 32 and the third channel 33 of the third mold gathers towards the center and accumulates in the high-flow-rate dispensing section 41a, while the fluid rubber passing through the first channel 31 of the third mold enters the low-flow-rate dispensing section 41b, thereby extruding a circular or arc-shaped rubber sealing strip from the fourth mold 4.

[0062] Specifically, the composite flow channel consists of a first injection port 11 of the first mold, a second injection port 12 of the first mold, a third injection port 13 of the first mold, a first inlet port 21 of the second mold, a second inlet port 22 of the second mold, a third inlet port 23 of the second mold, a first channel 31 of the third mold, a second channel 32 of the third mold, a third channel 33 of the third mold, and an outlet port 41 of the fourth mold. This composite flow channel creates a flow velocity difference between the left and right cross sections of the extruded sealing strip, causing the rubber sealing strip to form a predetermined spatial circular or arc shape.

[0063] Specifically, the edges of the first mold 1, the second mold 2, the third mold 3, and the fourth mold 4 are respectively provided with a number of positioning holes and mounting holes. The composite extrusion die head 100 also includes a number of pins 5 and screws 6, which are used to fix the first mold 1, the second mold 2, the third mold 3, and the fourth mold 4 together. In this embodiment, the first mold 1, the second mold 2, the third mold 3, and the fourth mold 4 can be assembled together simply and quickly using pins 5 and screws 6.

[0064] The composite extrusion die head 100 is also provided with mounting grooves 7 on both sides. The outer contours of the first die 1, the second die 2, the third die 3, and the fourth die 4 are all circular. The mounting grooves 7 can be used with other components to fix the composite extrusion die head in the required position.

[0065] like Figure 6-7 As shown, this illustrates the shape of the rubber sealing strip within the composite flow channel, as well as the shape of the formed rubber sealing strip. Figure 6-7 In the middle, the left side is the composite flow body A, and the right side is the molded rubber sealing strip 200.

[0066] The composite flow body A includes a low-flow-rate inlet section 203, a first high-flow-rate inlet section 204, and a second high-flow-rate inlet section 205; while the molded rubber sealing strip 200 includes a high-flow-rate end 201 and a low-flow-rate end 202.

[0067] like Figure 8 The method for producing molds for making rubber sealing strips by bending them into circles or arcs includes the following steps:

[0068] S1. Input the rubber raw material into the extruder;

[0069] S2. The rubber in a hot viscous fluid state enters the composite extrusion die head and passes through the composite flow channel formed by the first die, the second die, the third die, and the fourth die in sequence. The rubber sealing strip, shaped into a spatial circle or arc, is output from the composite extrusion die head.

[0070] S3. The rubber sealing strip, which is bent into a circle or arc shape, enters the vulcanization equipment for vulcanization, and finally forms the finished rubber sealing strip.

[0071] Specifically, the working principle of this invention is as follows: Figure 1-7 As shown, the rubber in a hot viscous fluid state simultaneously enters the composite extrusion die head 100, that is, simultaneously enters the first injection port 11, the second injection port 12, and the third injection port 13 of the first die, and then passes through the first inlet port 21, the second inlet port 22, and the third inlet port 23 of the second die respectively; and then passes through the first channel 31, the second channel 32, and the third channel 33 of the third die respectively.

[0072] In the third mold 3, stepped layer structures 34 are provided in both the second channel 32 and the third channel 33 of the third mold. The fluid rubber passing through the second channel 32 and the third channel 33 of the third mold gathers towards the center, which is equivalent to a change in the size of the second channel 32 and the third channel 33 of the third mold. This accelerates the compression of the fluid rubber, causing it to accumulate in the high-flow-rate outlet section 41a. Meanwhile, the fluid rubber passing through the first injection port 11 of the first mold, the first inlet port 21 of the second mold, and the first channel 31 of the third mold is at a normal compression speed and enters the low-flow-rate outlet section 41b. Therefore, the low-flow-rate inlet port section 203 is formed by the fluid rubber passing through the first injection port 11 of the first mold, the first inlet port 21 of the second mold, and the first channel 31 of the third mold.

[0073] The first high-flow-rate inlet section 204 is formed by the fluid rubber passing through the second injection port 12 of the first mold, the second inlet port 22 of the second mold, and the second channel 32 of the third mold; the second high-flow-rate inlet section 205 is formed by the fluid rubber passing through the third injection port 13 of the first mold, the third inlet port 23 of the second mold, and the third channel 33 of the third mold.

[0074] Finally, the high-flow-rate end 201 of the rubber sealing strip is extruded in the high-flow-rate dispensing section 41a, and the low-flow-rate end 202 of the rubber sealing strip is extruded in the low-flow-rate dispensing section 41b.

[0075] This invention creates a flow rate difference between the two cross sections of the extruded rubber sealing strip by designing a composite flow channel in the extrusion die head. This allows rubber sealing strips of any cross section to be extruded into a predetermined spatial circle or arc shape, greatly improving the production efficiency of rubber sealing strips that are bent into circles or arcs, while also reducing the cost of molds.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A mold for producing rubber sealing strips that are bent into circles or arcs, characterized in that, It includes a composite extrusion die head (100), which includes a first die (1), a second die (2), a third die (3), and a fourth die (4) fixed in sequence; The first mold (1) includes a first mold first injection port (11), a first mold second injection port (12), and a first mold third injection port (13). The first mold first injection port (11) is located in the middle of the first mold (1), and the first mold second injection port (12) and the first mold third injection port (13) are respectively located at the edges of the first mold (1). The second mold (2) includes a first injection port (21), a second injection port (22), and a third injection port (23). The first injection port (21) is located in the middle of the second mold (2), and the size of the first injection port (21) is smaller than the size of the first injection port (11) of the first mold. The second injection port (22) and the third injection port (23) are respectively located at the edges of the second mold (2). The third mold (3) includes a third mold first channel (31), a third mold second channel (32), and a third mold third channel (33); the third mold first channel (31) is located in the middle of the third mold (3), and the third mold second channel (32) and the third mold third channel (33) are respectively located at the edges of the third mold (3); The fourth mold (4) includes a fourth mold outlet (41) located in the middle of the fourth mold; the fourth mold outlet (41) is connected to the first channel (31) of the third mold; The composite flow channel is composed of the first injection port (11) of the first mold, the second injection port (12) of the first mold, the third injection port (13) of the first mold, the first inlet port (21) of the second mold, the second inlet port (22) of the second mold, the third inlet port (23) of the second mold, the first channel (31) of the third mold, the second channel (32) of the third mold, the third channel (33) of the third mold, and the outlet port (41) of the fourth mold.

2. The mold for producing a spatially bent circular or arc-shaped rubber sealing strip according to claim 1, characterized in that: The first inlet (21) of the second mold is connected to the first injection port (11) of the first mold, the second inlet (22) of the second mold is connected to the second injection port (12) of the first mold, and the third inlet (23) of the second mold is connected to the third injection port (13) of the first mold.

3. The mold for producing a spatially bent circular or arc-shaped rubber sealing strip according to claim 2, characterized in that: The first channel (31) of the third mold is connected to the first inlet (21) of the second mold, the second channel (32) of the third mold is connected to the second inlet (22) of the second mold, and the third channel (33) of the third mold is connected to the third inlet (23) of the second mold.

4. The mold for producing a spatially bent circular or arc-shaped rubber sealing strip according to claim 3, characterized in that: The fourth mold outlet (41) includes a high flow rate outlet section (41a) and a low flow rate outlet section (41b); the high flow rate outlet section (41a) and the low flow rate outlet section (41b) are located on opposite sides of the fourth mold outlet.

5. The mold for producing spatially bent circular or arc-shaped rubber sealing strips according to any one of claims 1 to 4, characterized in that: The first mold (1), the second mold (2), the third mold (3), and the fourth mold (4) are provided with a number of positioning holes and mounting holes at their edges. The composite extrusion die head (100) also includes a number of pins (5) and screws (6). The pins (5) and screws (6) are combined and fixed by the first mold (1), the second mold (2), the third mold (3), and the fourth mold (4).

6. The mold for producing spatially bent circular or arc-shaped rubber sealing strips according to any one of claims 1 to 4, characterized in that: The composite extrusion die head (100) is also provided with mounting grooves (7) on both sides.

7. The mold for producing spatially bent circular or arc-shaped rubber sealing strips according to any one of claims 1 to 4, characterized in that: The outer contours of the first mold (1), the second mold (2), the third mold (3), and the fourth mold (4) are all circular.

8. A production method using the mold for producing a spatially bent circular or arc-shaped rubber sealing strip as described in claim 4, characterized in that: Includes the following steps, S1. Input the rubber raw material into the extruder; S2. The rubber in a hot viscous fluid state enters the composite extrusion die head (100) and passes through the composite flow channel formed by the first die (1), the second die (2), the third die (3), and the fourth die (4) in sequence, and outputs a rubber sealing strip shaped into a spatial circle or arc from the composite extrusion die head (100); S3. The rubber sealing strip, which is bent into a circle or arc shape, enters the vulcanization equipment for vulcanization, and finally forms the finished rubber sealing strip.

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