Hot press rubber connecting mold

Abstract

The utility model relates to the technical field of mould, especially a hot-pressing rubber connecting mould, the lower mould plate is equipped with the concave arc surface that is concave downward, the lower mould plate is equipped with the material placing groove that is consistent with the arc of concave arc surface along concave arc surface, the upper mould plate is equipped with the convex arc surface that is matched with concave arc surface, and is equipped with the compression part that corresponds with material placing groove, material placing groove includes first clamping groove, connecting groove and second clamping groove, and connecting groove and compression part form connecting cavity between them. The hot-pressing rubber connecting mould is connected to the rubber blank in the connecting cavity, the pressure is maximum, the rubber blank melts under the stress and the heat state and then flows upwards, avoids the situation that rubber ring product appears local rubber lack, the density of the connecting place of rubber ring product after connecting is high, the rubber ring product is not easy to break when using, can solve the problem that the pressure in the connecting cavity is low after the mould of existing connecting mould closes, easily leads to the situation that sealing ring product appears local rubber lack, the density of the connecting place of product is poor, and is easy to break when using.

Description

Technical Field

[0001] This utility model relates to the technical field of molds, and in particular to a hot-press rubber splice mold. Background Technology

[0002] Rubber splicing molds are special molds used in the production of rubber products. They are used to splice the two ends of rubber strips to obtain rubber ring products (such as sealing ring products).

[0003] Existing rubber splicing molds are used for injection vulcanization splicing processes. For example, Chinese utility model patent CN218227577U discloses a sealing ring splicing mold that uses an injection assembly to inject glue at the connection points of the two ends of the rubber strip. That is, the splicing mold needs to be equipped with an injection channel. During the splicing process, when the glue flows into the injection channel and is shaped, some of the injection pressure is lost as it is transferred from the injection channel to the mold, which can easily lead to local glue shortages in the sealing ring product. At the same time, because the parting surfaces of the upper and lower molds in the existing splicing molds are both horizontal planes, and the material groove in the lower mold is opened along the plane, the pressure in the splicing cavity (the splicing cavity formed between the upper mold and the material groove after the upper and lower molds are closed) is still low, which can easily lead to local glue shortages, poor joint tightness, and easy breakage of the product during use. Utility Model Content

[0004] The main purpose of this utility model is to provide a hot-press rubber splicing mold that eliminates the need for an injection channel. During hot-press splicing, the pressure at the rubber blank in the splicing cavity is the highest. The rubber blank melts under stress and heat and then flows upward, avoiding localized glue shortages in the rubber ring product. The spliced ​​rubber ring product has high density and is less prone to breakage during use. This solves the problems of low pressure in the splicing cavity after mold closing in existing splicing molds, which easily leads to localized glue shortages, poor density at the splice, and easy breakage during use in sealing ring products.

[0005] To achieve the above objectives, this utility model proposes a hot-press rubber splicing mold, comprising an upper mold plate and a lower mold plate arranged from top to bottom; the upper end face of the lower mold plate is provided with a concave arc surface that is recessed downwards, the arc height of the concave arc surface gradually decreases and then gradually increases along the length direction of the lower mold plate, and the lower mold plate is provided with a material placement groove along the concave arc surface that matches the arc of the concave arc surface; the upper mold plate is provided with a convex arc surface at one end facing the lower mold plate that matches the concave arc surface, and the upper mold plate is provided with a pressing part along the convex arc surface that corresponds to the material placement groove, the arc of the pressing part being consistent with the arc of the convex arc surface; the material placement groove includes a first clamping groove, a splicing groove and a second clamping groove arranged sequentially, when the upper mold plate and the lower mold plate are closed, a first clamping cavity is formed between the first clamping groove and the pressing part, a second clamping cavity is formed between the second clamping groove and the pressing part, and a splicing cavity is formed between the splicing groove and the pressing part.

[0006] Optionally, the lower template includes a lower mold body, a first lower clamping block, and a second lower clamping block; the lower mold body has a first installation space and a second installation space at one end facing the upper template, the first installation space and the second installation space are spaced apart at both ends of the lower mold body along its length, the first lower clamping block is detachably connected to the first installation space, and the second lower clamping block is detachably connected to the second installation space; the upper end faces of the first lower clamping block, the lower mold body, and the second lower clamping block are interconnected to form an arc surface that matches the concave arc surface; the first clamping groove is formed on the upper end face of the first lower clamping block, the connecting groove is formed on the upper end face of the lower mold body, and the second clamping groove is formed on the upper end face of the second lower clamping block.

[0007] Optionally, the upper template further includes an upper mold body, a first upper clamping block, and a second upper clamping block; the upper mold body has a third mounting space and a fourth mounting space at one end facing the lower mold body, the third mounting space and the fourth mounting space are spaced apart at both ends of the upper mold body along its length, the first upper clamping block is detachably connected to the third mounting space, and the second upper clamping block is detachably connected to the fourth mounting space; the lower end faces of the first upper clamping block, the upper mold body, and the second upper clamping block are interconnected to form an arc surface that matches the convex arc surface; the pressing part includes a first pressing part, a second pressing part, and a third pressing part connected in sequence, and the first pressing part is fixedly connected to the lower end face of the first upper clamping block, the second pressing part is fixedly connected to the lower end face of the upper mold body, and the third pressing part is fixedly connected to the lower end face of the second upper clamping block.

[0008] Optionally, the lower template further includes two lower connecting parts fixedly connected to the lower mold body, the two lower connecting parts being disposed at both ends of the length direction of the lower mold body; the upper template further includes two upper connecting parts fixedly connected to the upper mold body, the two upper connecting parts being disposed at both ends of the length direction of the upper mold body; and the upper connecting parts and the lower connecting parts are disposed in a one-to-one correspondence; the facing end faces of the lower connecting parts and the upper connecting parts are both horizontally disposed planes; the two lower connecting parts are also respectively provided with lower clearance grooves corresponding to the positions of the first lower clamping block or the second lower clamping block, the two lower clearance grooves, the first clamping groove, the connecting groove and the second clamping groove are interconnected; the horizontal plane of the bottom of the first clamping groove at the end away from the connecting groove is higher than the horizontal plane of the bottom of the corresponding lower clearance groove, and the horizontal plane of the bottom of the second clamping groove at the end away from the connecting groove is higher than the horizontal plane of the bottom of the other corresponding lower clearance groove.

[0009] Optionally, the upper template further includes four guide pillars, which are fixedly connected to two upper connecting parts respectively. Each upper connecting part has one guide pillar fixedly connected to its left and right ends. One end of each guide pillar is fixedly connected to the corresponding upper connecting part, and the other end of each guide pillar protrudes from the upper connecting part toward the corresponding lower connecting part. The two lower connecting parts are respectively provided with guide holes that correspond one-to-one with the four guide pillars, and the guide holes are located on the left and right sides of the corresponding lower clearance groove.

[0010] Optionally, the lower mold body is further provided with a lower tear edge groove, which is provided on both sides of the width direction of the connecting groove, and the lower tear edge groove is spaced apart from the connecting groove; the upper mold body is further provided with an upper tear edge groove, which is provided on both sides of the width direction of the second pressing part, and the upper tear edge groove is spaced apart from the second pressing part; the position of the upper tear edge groove corresponds to the position of the lower tear edge groove.

[0011] Optionally, the distance L1 between the lower tear edge groove and the connecting groove is 0.1mm to 0.15mm, and the distance L2 between the upper tear edge groove and the second pressing part is 0.1mm to 0.15mm.

[0012] Optionally, the longitudinal section of the lower tearing groove is V-shaped, and the longitudinal section of the upper tearing groove is inverted V-shaped.

[0013] Optionally, the lower mold body is further provided with an excess glue groove, which is provided along the width direction of the lower mold body; one end of the excess glue groove is connected to one of the lower tear edge grooves, and the other end of the excess glue groove extends away from the lower tear edge groove.

[0014] Optionally, the lower template is provided with two material placement grooves along the concave arc surface, and the two material placement grooves are spaced apart along the width direction of the lower template; the upper template is provided with two pressing parts along the convex arc surface, and the pressing parts are provided in one-to-one correspondence with the material placement grooves.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By setting the upper end face of the lower template to be a concave arc surface that is recessed downwards, the material placement groove (including the first clamping groove, the connecting groove and the second clamping groove connected in sequence) is opened along the concave arc surface and is consistent with the curvature of the concave arc surface. During connection, the rubber blank can be placed at the bottom of the arc of the connecting groove. The two ends of the rubber strip to be connected are clamped in the first clamping groove and the second clamping groove respectively. The upper template is moved down by the flat vulcanizing machine and the lower template is pressed, thereby pressing the rubber strip and the rubber blank in the material placement groove. The rubber blank melts under stress and heat and is bonded to the ends of the rubber strip to be connected at both ends. After connection and forming, a rubber ring product is obtained. This can solve the problem that the injection pressure of the existing connection mold is partially lost during the process of the injection channel being transferred to the mold, resulting in local missing rubber in the rubber ring product.

[0017] 2. Because the thickness of the rubber blank is greater than the thickness of the splicing groove, when the upper mold presses down on the lower mold, the clamping part will first press the rubber blank, resulting in the maximum pressure at the rubber blank in the splicing cavity (i.e., the splicing point of the rubber ring product). The rubber blank melts under stress and heat and then flows upward, thus ensuring that the gap between the rubber blank and the ends of the rubber strips to be spliced ​​is evenly filled, avoiding localized glue shortages in the rubber ring product. This effectively improves the tightness of the splicing point of the rubber ring product after splicing, making the rubber ring product less prone to breakage during use. Because the splicing groove is an arc-shaped groove, the molten rubber blank still tends to flow towards the bottom of the arc of the splicing groove, further preventing localized glue shortages in the rubber ring product. This solves the problem of low pressure in the splicing cavity after the existing splicing mold is closed, which easily leads to localized glue shortages in the sealing ring product, poor tightness of the splicing point, and easy breakage during use.

[0018] 3. By setting the arc height of the first clamping groove and the second clamping groove to gradually increase in the direction away from the connecting groove, the first clamping cavity and the second clamping cavity can provide a greater gripping force for clamping the rubber strip when the mold is closed, so as to prevent the two ends of the rubber strip from sliding and shifting away from the connecting cavity, and to avoid deviation in the ring size of the rubber ring product. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the structure of a hot-press rubber splice mold according to an embodiment of the present invention; (the upper and lower templates are in the open state).

[0020] Figure 2 This is an exploded view of a hot-press rubber splicing mold, a portion of a rubber strip, and a rubber blank, representing one embodiment of the present invention (only the two ends of the rubber strip are shown; the entire rubber strip is not fully displayed).

[0021] Figure 3 This is a schematic diagram of the lower template of a hot-press rubber splice mold according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the upper template of a hot-press rubber splice mold according to an embodiment of the present invention;

[0023] Figure 5 This is a top view of the lower template, rubber strip, and rubber blank of a hot-press rubber splicing mold according to an embodiment of the present invention;

[0024] Figure 6 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 7 This is a partial cross-sectional view (front view, with the upper and lower templates in a closed state) of a hot-press rubber splice mold according to an embodiment of the present invention.

[0026] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0027] Figure 9 This is a schematic diagram (top view) of the connection port of the rubber strip according to an embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram (top view) of the connection port of the rubber strip according to another embodiment of the present invention;

[0029] Figure 11 This is a schematic diagram of the structure of the rubber strip and rubber blank according to one embodiment of the present invention.

[0030] In the attached diagram: 1. Upper template; 10. Convex arc surface; 11. Clamping part; 111. First clamping part; 112. Second clamping part; 113. Third clamping part; 12. Upper mold body; 121. Upper tearing edge groove; 13. First upper clamping block; 14. Second upper clamping block; 15. Upper connecting part; 151. Upper clearance groove; 16. Guide post; 2. Lower template; 20. Concave arc surface; 21. Material placement groove; 211. First... 212. Clamping groove; 213. Connecting groove; 22. Second clamping groove; 22. Lower mold body; 221. First installation space; 222. Second installation space; 223. Lower tear edge groove; 224. Excess glue groove; 23. First lower clamping block; 24. Second lower clamping block; 25. Lower connecting part; 251. Lower clearance groove; 252. Guide hole; 253. Guide sleeve; 3. Rubber strip; 31. Connecting port; 4. Rubber blank. Detailed Implementation

[0031] 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.

[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a fixed connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] To resolve the above technical issues, please refer to [link / reference]. Figures 1 to 5 This utility model proposes a hot-press rubber splicing mold, including an upper template 1 and a lower template 2 arranged from top to bottom;

[0036] The upper end face of the lower template 2 is provided with a concave arc surface 20 that is recessed downwards. The arc height of the concave arc surface 20 gradually decreases and then gradually increases along the length direction of the lower template 2. The lower template 2 is provided with a material placement groove 21 along the concave arc surface 20 with the same arc as the concave arc surface 20.

[0037] The upper template 1 is provided with a convex arc surface 10 that is adapted to the concave arc surface 20 at one end facing the lower template 2, and the upper template 1 is provided with a pressing part 11 corresponding to the material placement groove 21 along the convex arc surface 10, and the curvature of the pressing part 11 is consistent with the curvature of the convex arc surface 10.

[0038] The material placement groove 21 includes a first clamping groove 211, a connecting groove 212, and a second clamping groove 213 arranged in sequence. When the upper template 1 and the lower template 2 are closed, a first clamping cavity is formed between the first clamping groove 211 and the pressing part 11, a second clamping cavity is formed between the second clamping groove 213 and the pressing part 11, and a connecting cavity is formed between the connecting groove 212 and the pressing part 11.

[0039] It should be noted that the hot-pressing rubber joint mold of this utility model is installed on a flat vulcanizing machine. It can be understood that the hot-pressing rubber joint mold of this utility model is applied to the hot-pressing joint process of flat plates.

[0040] Please see Figure 5 For the preparation of rubber ring products (such as sealing ring products), please refer to [reference needed]. Figure 11When preparing the rubber ring, it is necessary to prepare a rubber strip 3 of a determined length (the rubber strip 3 can be prepared by extrusion molding and has been vulcanized) and a rubber blank 4 of a fixed size for splicing (commonly known as raw rubber, which refers to the unvulcanized rubber compound formed after mixing, i.e., the semi-finished product used to prepare the rubber ring). The length and width of the rubber blank 4 are set according to the size of the rubber ring, and the thickness of the rubber blank 4 is set to be greater than the maximum thickness of the splicing cavity, so that the volume of the rubber blank 4 is greater than the volume of the area to be spliced ​​of the rubber ring, so as to avoid the size deviation or local rubber shortage of the spliced ​​rubber ring due to insufficient volume of the rubber blank 4.

[0041] Please see Figure 5 In the open state, the hot-press rubber splicing mold of this utility model requires the rubber blank 4 to be placed at the bottom of the splicing groove 212 (since the material placement groove 21 is opened along the concave arc surface 20, it can be understood that the first clamping groove 211, the splicing groove 212 and the second clamping groove 213 are all arc-shaped grooves). The two ends of the rubber strip 3 are respectively clamped in the first clamping groove 211 and the second clamping groove 213, and the two ends of the rubber strip 3 to be spliced ​​are placed in the splicing groove 212 and abut against the two end faces of the rubber blank 4. Since the hardness of the rubber strip 3 is low (the hardness is about Shore 55 to 60 degrees), the middle section of the rubber strip 3 can be coiled on one side of the lower template 2 (e.g. Figure 5 (as shown);

[0042] When the mold is closed for splicing, the upper mold plate 1 moves downward and presses down on the lower mold plate 2. At this time, the pressing part 11 presses down on the rubber strip 3 and the rubber blank 4 located in the material groove 21. The two ends of the rubber strip 3 are respectively placed in the first clamping cavity and the second clamping cavity and pressed down, while the two ends of the rubber strip 3 to be spliced ​​and the rubber blank 4 are pressed down in the splicing cavity. The flat vulcanizing machine is started to perform hot pressing and vulcanization operations (i.e. splicing operations). The rubber blank 4 melts under hot pressing and is bonded to the two ends of the rubber strip 3 to be spliced. After full vulcanization and curing, the rubber ring product is obtained.

[0043] The hot-press rubber splicing mold of this utility model has a concave arc surface 20 on the upper end face of the lower template 2. The material placement groove 21 (including the first clamping groove 211, the splicing groove 212 and the second clamping groove 213 arranged in sequence) is opened along the concave arc surface 20 and is consistent with the curvature of the concave arc surface 20. During splicing, the rubber blank 4 can be placed at the bottom of the arc of the splicing groove 212, and the two ends of the rubber strip 3 to be spliced ​​are respectively clamped in the first clamping groove 211 and the second clamping groove 213. Within the clamping groove 213, the upper template 1 is moved downwards and pressed against the lower template 2 by the flat vulcanizing machine, thereby pressing the rubber strip 3 and the rubber blank 4 in the material placement groove 21 together. This causes the rubber blank 4 to melt under stress and heat and bond with the ends of the rubber strip 3 to be joined, forming the rubber ring product. This solves the problem of partial loss of glue in the rubber ring product caused by the glue injection pressure being transferred from the glue injection channel to the mold in the existing joining mold.

[0044] Furthermore, since the thickness of the rubber blank 4 is greater than the thickness of the connecting groove 212, when the upper template 1 presses down on the lower template 2, the pressing part 11 will first press the rubber blank 4 (equivalent to only a small part of the bottom material groove 21 contacting the rubber blank 4, and the rubber blank 4 being the stress point; according to the principle that pressure is greatest when a point is stressed), the pressure at the rubber blank 4 in the connecting cavity (i.e., the connecting point of the rubber ring product) will be maximized. The rubber blank 4 melts under stress and heat and then flows upwards, thereby ensuring that the gap between the rubber blank 4 and the ends of the rubber strips 3 to be connected is evenly filled. This design effectively improves the tightness of the joint of the rubber ring after splicing, preventing localized glue shortages and reducing the likelihood of breakage during use. Furthermore, because the splicing groove 212 is arc-shaped and the rubber blank 4 is located at the bottom of the arc, the molten rubber blank 4 still tends to flow towards the bottom of the arc after splicing, further preventing localized glue shortages in the rubber ring. This addresses the problem of low pressure within the splicing cavity after mold closing, which easily leads to localized glue shortages, poor joint tightness, and easy breakage during use in existing splicing molds.

[0045] Furthermore, since the lower template 2 is provided with a downwardly recessed concave arc surface 20, the arc heights of the first clamping groove 211 and the second clamping groove 213 gradually increase in the direction away from the connecting groove 212, so that when the hot-pressed rubber connecting mold is closed, the first clamping cavity and the second clamping cavity can provide a greater gripping force for clamping the rubber strip 3. When clamping the two ends of the rubber strip 3, it can prevent the two ends of the rubber strip 3 from sliding and shifting away from the connecting cavity, thus avoiding deviations in the ring size of the rubber ring product.

[0046] Please see Figure 2 and Figure 3 Furthermore, the lower template 2 includes a lower template body 22, a first lower clamping block 23, and a second lower clamping block 24;

[0047] The lower mold body 22 has a first installation space 221 and a second installation space 222 at one end facing the upper mold plate 1. The first installation space 221 and the second installation space 222 are spaced apart at both ends of the lower mold body 22 in the length direction. The first lower clamping block 23 is detachably connected to the first installation space 221, and the second lower clamping block 24 is detachably connected to the second installation space 222.

[0048] The upper surfaces of the first lower clamping block 23, the lower mold body 22, and the second lower clamping block 24 are interconnected to form an arc surface that matches the concave arc surface 20;

[0049] The first clamping groove 211 is formed on the upper end face of the first lower clamping block 23, the connecting groove 212 is formed on the upper end face of the lower mold body 22, and the second clamping groove 213 is formed on the upper end face of the second lower clamping block 24.

[0050] To further explain, the shapes of the first clamping cavity, the second clamping cavity, and the connecting cavity are adapted to each other, that is, the shapes of the first clamping cavity, the second clamping cavity, and the connecting cavity are the same as the shape of the rubber strip 3 to be connected.

[0051] However, because the joint area of ​​the rubber strip 3 will partially shrink after cooling during splicing, the cavity size of the splicing groove 212 needs to be enlarged according to the size of the rubber strip 3. This results in a larger volume of the joint area of ​​the rubber strip 3 immediately after splicing, and the joint area will partially shrink after cooling, thus ensuring that the size of the joint area is consistent with the size of the rubber strip 3. More specifically, the cavity size of the splicing groove 212 can be set according to the shrinkage rate of different rubber materials. For example, when the material of the rubber strip 3 is natural rubber, the cavity size of the splicing groove 212 can be enlarged by 1.018 to 1.02 times the size of the rubber strip 3, that is, the gap between the splicing groove 212 and the rubber strip 3 within the splicing groove 212 is a positive number.

[0052] The cavity dimensions of the first clamping groove 211 and the second clamping groove 213 need to be reduced according to the size of the rubber strip 3 so that the first clamping groove 211 and the second clamping groove 213 can better clamp the rubber strip 3 and avoid the rubber strip 3 from shifting position. For example, when the rubber strip 3 is clamped in the first clamping groove 211 and the second clamping groove 213 respectively, the gap value between the first clamping groove 211 and the rubber strip 3 and the gap value between the second clamping groove 213 and the rubber strip 3 are both negative. The range of the negative gap value can be set to 0.01mm to 0.05mm.

[0053] Since the cavity size of the connecting groove 212 is not exactly equal to the cavity size of the first clamping groove 211 or the second clamping groove 213, by setting the first lower clamping block 23 and the second lower clamping block 24 to be detachably connected to the lower mold body 22, it is helpful to open the first clamping groove 211, the connecting groove 212 and the second clamping groove 213 with different sizes.

[0054] To further explain, the height difference between the horizontal plane where the highest point of the concave arc surface 20 is located and the horizontal plane where the lowest point of the concave arc surface 20 is located ranges from 25mm to 35mm.

[0055] To further explain, the first lower clamping block 23 and the second lower clamping block 24 have the same structure, and the first lower clamping block 23 and the second lower clamping block 24 are symmetrically arranged with respect to the lower mold body 22. To further explain, the first clamping groove 211 and the second clamping groove 213 also have the same structure and are symmetrically arranged with respect to the lower mold body 22.

[0056] Specifically, the first lower clamping block 23 can be installed in the first mounting space 221 by bolts, and the second lower clamping block 24 can be installed in the second mounting space 222 by bolts.

[0057] Please see Figure 2 and Figure 4 Furthermore, the upper template 1 also includes an upper mold body 12, a first upper clamping block 13, and a second upper clamping block 14;

[0058] The upper mold body 12 has a third installation space and a fourth installation space at one end facing the lower mold body 22. The third installation space and the fourth installation space are spaced apart at both ends of the upper mold body 12 in the length direction. The first upper clamping block 13 is detachably connected to the third installation space, and the second upper clamping block 14 is detachably connected to the fourth installation space.

[0059] The lower end faces of the first upper clamping block 13, the upper mold body 12, and the second upper clamping block 14 are interconnected to form an arc surface that matches the convex arc surface 10;

[0060] The clamping part 11 includes a first clamping part 111, a second clamping part 112, and a third clamping part 113 connected in sequence. The first clamping part 111 is fixedly connected to the lower end face of the first upper clamping block 13, the second clamping part 112 is fixedly connected to the lower end face of the upper mold body 12, and the third clamping part 113 is fixedly connected to the lower end face of the second upper clamping block 14.

[0061] When the upper template 1 presses down on the lower template 2, the first upper clamping block 13 correspondingly clamps the first lower clamping block 23, and the second upper clamping block 14 correspondingly clamps the second lower clamping block 24. By setting the first upper clamping block 13 and the second upper clamping block 14 to be detachably connected to the upper mold body 12, when the first upper clamping block 13 or the second upper clamping block 14 is worn and the clamping effect is poor, it is not necessary to replace the entire upper template 1. The first upper clamping block 13 or the second upper clamping block 14 can be flexibly adjusted or directly replaced to better clamp the rubber strip 3.

[0062] Furthermore, the first upper clamping block 13 and the second upper clamping block 14 have the same structure, and the first upper clamping block 13 and the second upper clamping block 14 are symmetrically arranged with respect to the upper mold body 12; further, the first pressing part 111 and the third pressing part 113 also have the same structure and are symmetrically arranged with respect to the upper mold body 12.

[0063] Specifically, the first upper clamping block 13 can be bolted into the third mounting space, and the second upper clamping block 14 can be bolted into the fourth mounting space.

[0064] To further explain, the first pressing part 111 and the first upper clamping block 13 are integrally formed, the second pressing part 112 and the upper mold body 12 are integrally formed, and the third pressing part 113 and the second upper clamping block 14 are integrally formed.

[0065] Please see Figures 2 to 5 Furthermore, the lower template 2 also includes two lower connecting parts 25 that are fixedly connected to the lower mold body 22, and the two lower connecting parts 25 are disposed at both ends of the lower mold body 22 in the length direction;

[0066] The upper template 1 also includes two upper connecting parts 15 that are fixedly connected to the upper mold body 12. The two upper connecting parts 15 are disposed at both ends of the upper mold body 12 in the length direction; and the upper connecting parts 15 and the lower connecting parts 25 are disposed in a one-to-one correspondence.

[0067] The opposing end faces of the lower connecting part 25 and the upper connecting part 15 are both horizontally arranged planes;

[0068] The two lower connecting parts 25 are also provided with lower clearance grooves 251 corresponding to the positions of the first lower clamping block 23 or the second lower clamping block 24, and the two lower clearance grooves 251, the first clamping groove 211, the connecting groove 212 and the second clamping groove 213 are interconnected.

[0069] The bottom of the first clamping groove 211 at the end away from the connecting groove 212 is at a higher horizontal position than the bottom of the corresponding lower clearance groove 251. The bottom of the second clamping groove 213 at the end away from the connecting groove 212 is at a higher horizontal position than the bottom of the other corresponding lower clearance groove 251.

[0070] It should be noted that when the hot-pressed rubber joint mold is closed, the upper template 1 moves downward and presses down on the lower template 2. At this time, the lower end face of the upper connecting part 15 will press against the upper end face of the corresponding lower connecting part 25. By setting two upper connecting parts 15 and two lower connecting parts 25, and the facing end faces of the upper connecting parts 15 and the lower connecting parts 25 are both horizontal planes, the stability of the upper template 1 pressing down on the lower template 2 is improved.

[0071] The lower clearance groove 251 is used to avoid the rubber strip 3, so as to prevent the rubber strip 3 from being crushed when the upper template 1 presses down on the lower template 2. Furthermore, the two upper connecting portions 15 are also respectively provided with upper clearance grooves 151 corresponding to the corresponding lower clearance grooves 251.

[0072] To further explain, the two upper connecting parts 15 are symmetrically arranged with respect to the upper mold body 12, and the two lower connecting parts 25 are symmetrically arranged with respect to the lower mold body 22.

[0073] Please see Figures 3 to 5 Furthermore, the upper template 1 also includes four guide pillars 16, which are fixedly connected to the two upper connecting parts 15 respectively. Each upper connecting part 15 has a guide pillar 16 fixedly connected to its left and right ends respectively.

[0074] One end of the guide post 16 is fixedly connected to the corresponding upper connecting part 15, and the other end of the guide post 16 protrudes from the upper connecting part 15 in the direction of the corresponding lower connecting part 25.

[0075] The two lower connecting parts 25 are respectively provided with guide holes 252 that correspond one-to-one with the four guide posts 16, and the guide holes 252 are respectively located on the left and right sides of the corresponding lower clearance grooves 251.

[0076] When the upper template 1 is descending, the guide post 16 is inserted into the corresponding guide hole 252 for positioning, which helps to improve the stability of the upper template 1 when pressing down on the lower template 2 and avoids deviation in the relative position between the upper template 1 and the lower template 2, which would affect the effect of connecting the rubber strip 3.

[0077] To further explain, a hollow guide sleeve 253 is provided in the guide hole 252, and the guide post 16 is inserted into the guide sleeve 253, so that the guide post 16 and the guide hole 252 can fit tightly together, thereby improving the stability when the upper template 1 presses down on the lower template 2.

[0078] Please see Figures 6 to 8 Furthermore, the lower mold body 22 is also provided with a lower tear edge groove 223, which is provided on both sides of the width direction of the connecting groove 212, and the lower tear edge groove 223 and the connecting groove 212 are spaced apart.

[0079] The upper mold body 12 is also provided with an upper tearing groove 121, which is provided on both sides of the second pressing part 112 in the width direction, and the upper tearing groove 121 is spaced apart from the second pressing part 112.

[0080] The position of the upper tear groove 121 corresponds to the position of the lower tear groove 223.

[0081] Specifically, when the upper template 1 and the lower template 2 are closed, the upper tearing groove 121 and the lower tearing groove 223 form a tearing cavity.

[0082] Please see Figure 7 and Figure 8 Because the excessively melted rubber blank 4 will overflow after being heated and expanded, the upper mold 1 and the lower mold 2 cannot be fully fitted together. When the hot-press rubber joint mold of this utility model is closed, the excessively melted rubber blank 4 will form a flash structure at the position where the upper mold 1 and the lower mold 2 are fitted together.

[0083] By setting the upper tearing groove 121 and the lower tearing groove 223, with the lower tearing groove 223 spaced apart from the connecting groove 212, and the upper tearing groove 121 spaced apart from the second pressing part 112, excess molten rubber blank 4 can be guided to flow into the tearing cavity. This results in the formation of flash structures between the tearing cavity and the connecting cavity, and on the side of the tearing cavity away from the connecting cavity. The flash structures can be removed in the subsequent tearing process. After the rubber ring product is demolded, the operator can easily tear off the excess portion along the flash structure between the tearing cavity and the connecting cavity.

[0084] Please see Figure 8 Furthermore, the distance L1 between the lower tear edge groove 223 and the connecting groove 212 is 0.1mm to 0.15mm, and the distance L2 between the upper tear edge groove 121 and the second pressing part 112 is 0.1mm to 0.15mm.

[0085] By setting the distance L1 between the lower tear groove 223 and the connecting groove 212, and the distance L2 between the upper tear groove 121 and the pressing part 11 to be 0.1mm to 0.15mm, that is, the distance between the tear cavity and the connecting cavity is 0.1mm to 0.15mm, a thin and uniform burr structure can be formed between the tear cavity and the connecting cavity.

[0086] Because rubber materials shrink after cooling and molding, if the distance between the tearing cavity and the connecting cavity is too small, the connecting area of ​​the rubber ring product cannot form a thin flash structure after cooling and shrinking (that is, the connection between the rubber material in the tearing cavity and the rubber material in the connecting cavity is too strong), which increases the difficulty of the subsequent tearing process and makes it easy to tear the rubber ring product itself, resulting in an increased scrap rate. On the other hand, if the distance between the tearing cavity and the connecting cavity is too large, the width of the flash structure between the tearing cavity and the connecting cavity will be larger. When the operator performs the tearing process, some flash structure is easy to remain, thus affecting the effect of flash removal.

[0087] Please see Figure 8 Furthermore, the longitudinal section of the lower tearing groove 223 is V-shaped, and the longitudinal section of the upper tearing groove 121 is inverted V-shaped.

[0088] More specifically, both the lower tear groove 223 and the upper tear groove 121 are V-shaped grooves. The inclined surface inside the lower tear groove 223 can better guide the excess melted rubber blank 4 to gather towards the center of the lower tear groove 223. Furthermore, the inclined surfaces of the lower tear groove 223 and the upper tear groove 121 can cause the rubber material in the tear cavity to naturally shrink along the slope, making the flash structure formed between the tear cavity and the connecting cavity a relatively weak area. During the tearing process, the flash structure between the tear cavity and the connecting cavity can be broken preferentially, which helps the operator to quickly remove the flash structure.

[0089] Please see Figure 2 and Figure 6 Furthermore, the lower mold body 22 is also provided with an excess glue groove 224, which is provided along the width direction of the lower mold body 22.

[0090] One end of the excess glue groove 224 is connected to one of the lower tear edge grooves 223, and the other end of the excess glue groove 224 extends away from the lower tear edge groove 223.

[0091] When the upper mold 1 and the lower mold 2 are closed, excess melted rubber blank 4 will overflow at the seam, forming the flash structure. By simultaneously setting the lower tear groove 223 and the excess glue groove 224, the excess melted rubber blank 4 can be guided into the lower tear groove 223 and the excess glue groove 224, avoiding the flash structure formed at the joint of the upper mold 1 and the lower mold 2 being too thick. When performing the tearing process on the rubber ring product, no complicated trimming tools are needed. The operator can directly tear the flash structure by hand, which helps to improve production efficiency.

[0092] To further explain, the number of excess glue grooves 224 is set to two, and the two excess glue grooves 224 are spaced apart along the length direction of the lower mold body 22.

[0093] Please see Figures 1 to 5 Furthermore, the lower template 2 is provided with two material placement grooves 21 along the concave arc surface 20, and the two material placement grooves 21 are spaced apart along the width direction of the lower template 2.

[0094] The upper template 1 is provided with two pressing parts 11 along the convex arc surface 10, and the pressing parts 11 are provided in a one-to-one correspondence with the material placement groove 21.

[0095] By setting two material placement grooves 21, the hot-press rubber splicing mold of this utility model can simultaneously splice two rubber strips 3 to produce two rubber ring products, which helps to improve production efficiency.

[0096] More specifically, in one embodiment of this utility model, the two material placement grooves 21 each include a first clamping groove 211, a connecting groove 212, and a second clamping groove 213 arranged in sequence. The two first clamping grooves 211 are respectively opened on the upper end surface of the first lower clamping block 23, the two connecting grooves 212 are respectively opened on the upper end surface of the lower mold body 22, and the two second clamping grooves 213 are respectively opened on the upper end surface of the second lower clamping block 24. The two clamping parts 11 each include a first clamping part 111, a second clamping part 112, and a third clamping part 113 connected in sequence. The two first clamping parts 111 are fixedly connected to the lower end face of the first upper clamping block 13, the two second clamping parts 112 are fixedly connected to the lower end face of the upper mold body 12, and the two third clamping parts 113 are fixedly connected to the lower end face of the second upper clamping block 14. The two connecting grooves 212 are provided with lower tear edge grooves 223 at both ends in the width direction, and the two second clamping parts 112 are provided with upper tear edge grooves 121 at both ends in the width direction. The two connecting grooves 212 are connected to the residual glue grooves 224 at their opposite ends.

[0097] For further explanation, please refer to Figures 9 to 10 The two ends of the rubber strip 3 to be joined can be symmetrically provided with connection ports 31, and the connection ports 31 are vulcanized and spliced ​​with the rubber blank 4; in one embodiment, such as Figure 9 As shown, the cross-sectional shape of the connecting port 31 is dovetail-shaped, and the width L3 of the bottom of the connecting port 31 is greater than the width L4 of the end of the connecting port 31. This results in a larger contact area between the bottom of the connecting port 31 of the rubber strip 3 and the molten rubber blank 4, which helps to improve the adhesion between the rubber strip 3 and the rubber blank 4, and increases the tension when the rubber strip 3 and the rubber blank 4 are joined. The resulting rubber ring product has high tensile strength in the joint area after vulcanization and setting, ensuring that it will not easily break during use; in another embodiment, as... Figure 10 As shown, the cross-sectional shape of the connecting port 31 is arc-shaped. After cutting the rubber strip 3 to a certain length, the arc-shaped connecting port 31 can be obtained using a simple insert cutter, which helps to improve production efficiency. In another embodiment, this utility model can also be used to splice two rubber strips.

[0098] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A hot-press rubber splice mold, characterized in that, This includes top and bottom templates set from top to bottom; The upper end face of the lower template is provided with a concave arc surface that is recessed downwards. The height of the arc surface gradually decreases and then gradually increases along the length direction of the lower template. The lower template has a material placement groove along the concave arc surface that has the same curvature as the concave arc surface. The upper template has a convex arc surface at one end facing the lower template that is adapted to the concave arc surface, and the upper template has a pressing part along the convex arc surface that corresponds to the material placement groove. The curvature of the pressing part is consistent with the curvature of the convex arc surface. The material placement groove includes a first clamping groove, a connecting groove, and a second clamping groove arranged in sequence. When the upper template and the lower template are closed, a first clamping cavity is formed between the first clamping groove and the pressing part, a second clamping cavity is formed between the second clamping groove and the pressing part, and a connecting cavity is formed between the connecting groove and the pressing part.

2. The hot-press rubber splice mold according to claim 1, characterized in that, The lower template includes a lower mold body, a first lower clamping block, and a second lower clamping block; The lower mold body has a first installation space and a second installation space at one end facing the upper mold plate. The first installation space and the second installation space are spaced apart at both ends of the length direction of the lower mold body. The first lower clamping block is detachably connected to the first installation space, and the second lower clamping block is detachably connected to the second installation space. The upper surfaces of the first lower clamping block, the lower mold body, and the second lower clamping block are interconnected to form an arc surface that matches the concave arc surface; The first clamping groove is formed on the upper end face of the first lower clamping block, the connecting groove is formed on the upper end face of the lower mold body, and the second clamping groove is formed on the upper end face of the second lower clamping block.

3. The hot-press rubber splice mold according to claim 2, characterized in that, The upper template also includes an upper mold body, a first upper clamping block, and a second upper clamping block; The upper mold body has a third installation space and a fourth installation space at one end facing the lower mold body. The third installation space and the fourth installation space are spaced apart at both ends of the upper mold body along its length. The first upper clamping block is detachably connected to the third installation space, and the second upper clamping block is detachably connected to the fourth installation space. The lower end faces of the first upper clamping block, the upper mold body, and the second upper clamping block are interconnected to form an arc surface that matches the convex arc surface; The clamping part includes a first clamping part, a second clamping part, and a third clamping part connected in sequence. The first clamping part is fixedly connected to the lower end face of the first upper clamping block, the second clamping part is fixedly connected to the lower end face of the upper mold body, and the third clamping part is fixedly connected to the lower end face of the second upper clamping block.

4. The hot-press rubber splice mold according to claim 3, characterized in that, The lower template also includes two lower connecting parts that are fixedly connected to the lower mold body, and the two lower connecting parts are disposed at both ends of the lower mold body in the length direction; The upper template also includes two upper connecting parts that are fixedly connected to the upper mold body. The two upper connecting parts are disposed at both ends of the upper mold body in the length direction; and the upper connecting parts and the lower connecting parts are disposed in a one-to-one correspondence. The opposing end faces of the lower connecting part and the upper connecting part are both horizontally arranged planes; The two lower connecting parts are also respectively provided with lower clearance grooves corresponding to the positions of the first lower clamping block or the second lower clamping block. The two lower clearance grooves, the first clamping groove, the connecting groove and the second clamping groove are interconnected. The bottom of the first clamping groove at the end furthest from the connecting groove is at a higher horizontal level than the bottom of the corresponding lower clearance groove. The bottom of the second clamping groove at the end furthest from the connecting groove is at a higher horizontal level than the bottom of the other corresponding lower clearance groove.

5. The hot-press rubber splice mold according to claim 4, characterized in that, The upper template also includes four guide pillars, which are fixedly connected to the two upper connecting parts respectively. Each upper connecting part has one guide pillar fixedly connected to its left and right ends. One end of the guide post is fixedly connected to the corresponding upper connecting part, and the other end of the guide post protrudes from the upper connecting part in the direction of the corresponding lower connecting part; The two lower connecting parts are respectively provided with guide holes that correspond one-to-one with the four guide posts, and the guide holes are respectively located on the left and right sides of the corresponding lower clearance groove.

6. The hot-press rubber splice mold according to claim 3, characterized in that, The lower mold body is also provided with a lower tear edge groove, which is provided on both sides of the width direction of the connecting groove, and the lower tear edge groove and the connecting groove are spaced apart. The upper mold body is also provided with an upper tearing edge groove, which is provided on both sides of the width direction of the second pressing part, and the upper tearing edge groove is spaced apart from the second pressing part; The position of the upper tearing groove is set to correspond to the position of the lower tearing groove.

7. The hot-press rubber splice mold according to claim 6, characterized in that, The distance L1 between the lower tear edge groove and the connecting groove is 0.1mm to 0.15mm, and the distance L2 between the upper tear edge groove and the second pressing part is 0.1mm to 0.15mm.

8. The hot-press rubber splice mold according to claim 7, characterized in that, The lower tearing groove has a V-shaped longitudinal section, and the upper tearing groove has an inverted V-shaped longitudinal section.

9. The hot-press rubber splice mold according to claim 6, characterized in that, The lower mold body is also provided with an excess glue groove, which is provided along the width direction of the lower mold body; One end of the excess glue groove is connected to one of the lower tear edge grooves, and the other end of the excess glue groove extends away from the lower tear edge groove.

10. The hot-press rubber splice mold according to claim 1, characterized in that, The lower template is provided with two material placement grooves along the concave arc surface, and the two material placement grooves are spaced apart along the width direction of the lower template; The upper template is provided with two pressing parts along the convex arc surface, and the pressing parts are provided in a one-to-one correspondence with the material placement groove.

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