Production mold and demolding method for rubber cylinder with end cover

Abstract

The application discloses a production mold and a demolding method for a rubber cylinder body with an end cover, and comprises a cylinder body mold and an end cover mold. The cylinder body mold comprises an outer mold, an inner mold, a cylinder body top mold and a cylinder body bottom mold. The inner mold comprises at least two sliding inner mold cores arranged opposite to each other and at least two fixed inner mold cores arranged opposite to each other. The fixed inner mold cores and the sliding inner mold cores are distributed at intervals. The inner mold is provided with a core-pulling cavity and an intermediate mold core matched with the core-pulling cavity. The intermediate mold core is in a taper type with a large upper part and a small lower part, and has a sliding fit structure with the sliding inner mold core. The end cover mold comprises an end cover upper mold and an end cover lower mold. The end cover mold is provided with an adjustable support. The end cover mold can be supported on the adjustable support, and the inclination angle of the end cover mold can be adjusted through the adjustable support. The production of large-size products can be realized. The mold is convenient to disassemble and assemble, time and labor are saved, the production efficiency is improved, the operation is simple, and the application is convenient to implement.

Description

Technical Field

[0001] This invention belongs to the field of mold structure, specifically relating to a production mold for a rubber cylinder with end caps and a demolding method. Background Technology

[0002] In the existing technology, the production of gel or plastic products mainly adopts extrusion molding or injection molding. However, the molding of cylindrical bodies usually requires the combination of blow molding. Extrusion blow molding is a method for manufacturing hollow thermoplastic parts, such as the patent with patent number "201510561981.1" entitled "A Blow Molding Mold for Oil Drums".

[0003] However, during the research process, the applicant discovered that the current blow molding process is difficult to meet the production requirements of large-sized cylindrical bodies (usually referring to lengths exceeding 1000mm, outer diameters exceeding 300mm, and wall thicknesses exceeding 15mm), and is prone to cracking problems. If a direct extrusion process combined with internal and external molds is used, the existing molds often have difficulties in demolding due to their large contact area, or the demolding process can easily damage the product. In addition, due to the thin end caps, flow difficulties often occur, leading to cavity areas, etc. Therefore, there is an urgent need to improve the production process and equipment for large-sized rubber cylinders. Summary of the Invention

[0004] In view of this, the present invention provides a mold for producing rubber cylinders with end caps and a demolding method to solve the problems in the prior art where demolding is difficult in the production process of large-size rubber cylinders, and production quality and efficiency are hard to guarantee.

[0005] The technical solution is as follows:

[0006] A mold for producing a rubber cylinder with end caps, the key features of which are: a cylinder mold and an end cap mold, wherein the cylinder mold includes an outer mold, an inner mold, a top mold and a bottom mold, the inner mold includes at least two opposing sliding inner mold cores and at least two opposing fixed inner mold cores, and the fixed inner mold cores and sliding inner mold cores are spaced apart, the inner mold has a core-pulling cavity and an intermediate mold core adapted to the core-pulling cavity, the intermediate mold core is a cone shape with a larger upper part and a smaller lower part, and has a sliding fit structure with the sliding inner mold cores;

[0007] The end cap mold includes an upper end cap mold and a lower end cap mold. The end cap mold is equipped with an adjustable bracket, which can support the end cap mold and adjust and fix its tilt angle.

[0008] The above solution mainly optimizes the mold structure by setting a fixed inner mold core and a sliding inner mold core, which are used in conjunction with an intermediate mold core. This allows for quick demolding of the inner mold through core pulling, greatly reducing the difficulty of demolding and improving demolding efficiency. It also avoids the impact of improper demolding operation on product quality. In addition, the end cap mold is equipped with an adjustable bracket, which can adjust the tilt angle of the end cap mold according to the amount and speed of glue injection, as well as the heating and cooling process, to achieve better molding quality.

[0009] Preferably, the adjustable bracket has a movable base and a lifting seat supported on the movable base. The top of the lifting seat has a fixed seat, and the fixed seat and the end cap mold have a mutually cooperating rotational support structure and a locking structure. Using this solution, the mold position and height can be better adjusted to adapt to the production environment and the height of the extruder, etc.

[0010] Preferably, the end cap mold has an openable end mold channel, which is V-shaped. This design improves the flowability of the rubber compound within the mold cavity, further enhancing production efficiency and ensuring better product quality.

[0011] Preferably, the outer mold has a tiered structure, comprising at least two outer mold bodies. Flange connections are used between adjacent outer mold bodies, and between the outer mold bodies and the top and bottom molds of the cylinder. Ejection structures are provided between adjacent outer mold bodies and between the outer mold bodies and the bottom mold. This tiered outer mold structure facilitates mold assembly and disassembly, makes it easier to ensure overall strength and quality, and reduces the cost associated with large-size machining.

[0012] Preferably, the inner mold includes two sliding inner mold cores and two fixed inner mold cores. The middle mold core is shaped like a frustum of a square pyramid. T-shaped guide rails are provided on the surfaces of the middle mold core opposite to the sliding and fixed inner mold cores. The sliding and fixed inner mold cores have guide rail grooves that mate with the T-shaped guide rails. This design helps ensure that the sliding inner mold cores on both sides synchronously and stably retract during the lifting of the middle mold core, preventing deformation caused by uneven stress.

[0013] Preferably, the intermediate mold core and the sliding inner mold core have a linkage structure. Using this solution, the sliding inner mold core can be lifted out simultaneously with the intermediate mold core, shortening the demolding time.

[0014] Preferably, the intermediate mold core has a hollow structure with an insertion hole facing the sliding inner mold core. The insertion hole is fitted with a corresponding stop block, and the top of the sliding inner mold core has a stop block fixing screw hole for securing the stop block. This solution is simple to implement, low in cost, and easy to promote.

[0015] Preferably, the top mold of the cylinder has a mutually cooperating connection structure with the outer mold, as well as with each sliding inner mold core and the fixed inner mold core.

[0016] Preferably, the bottom of the intermediate mold core has evenly distributed tapered pins, and the bottom mold of the cylinder has positioning holes that transition with the tapered pins. This design helps ensure the stability of the intermediate mold core. Once the intermediate mold core is stable, the inner mold can be slidably engaged with it and lowered to the bottom as a whole, thus ensuring the shape of the mold cavity and shortening the molding time.

[0017] Based on the aforementioned mold for producing a rubber cylinder with end caps, this application also proposes a corresponding demolding method, the technical solution of which is as follows:

[0018] A demolding method for a mold used in the production of a rubber cylinder with end caps, the key of which includes the following steps:

[0019] S1. Hoist the cylindrical mold into the foundation pit and keep it vertically stable;

[0020] S2. Remove the bolts connecting the top mold and the outer mold of the cylinder, and use the set screws to separate the top mold and the outer mold of the cylinder.

[0021] S3. The top mold and intermediate mold core of the cylinder are hoisted as a whole. The intermediate mold core drives the sliding inner mold core to retract inward. After the top mold of the cylinder is hoisted a distance L, the sliding inner mold core and the intermediate mold core are connected by the stop block. The top mold of the cylinder is then hoisted out together with the sliding inner mold core.

[0022] S4. Remove the fixed inner mold core and the outer mold body located above, and then lift out the rubber cylinder body;

[0023] S5. Finally, remove the bottom outer mold body.

[0024] Using the above solution, the demolding process is simple, convenient, and reliable.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] The mold and demolding method for producing rubber cylinders with end caps provided by this invention can meet the production needs of large-size products. At the same time, the mold is easy to assemble and disassemble, saving time and effort, which helps to improve production efficiency. It is also simple to operate and easy to implement. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 for Figure 1 Sectional view;

[0029] Figure 3 This is a schematic diagram of the demolding of the sliding inner mold core;

[0030] Figure 4 This is a schematic diagram of the main structure of the outer mold;

[0031] Figure 5 for Figure 3 A schematic diagram showing the relative positions of the intermediate mold core and the inner mold;

[0032] Figure 6 This is a schematic diagram of the intermediate mold core structure;

[0033] Figure 7 for Figure 6 Sectional view;

[0034] Figure 8 This is a schematic diagram of the internal mold structure;

[0035] Figure 9 This is a schematic diagram of the bottom mold structure of the cylinder;

[0036] Figure 10 A schematic diagram showing the installation and usage status of the end cap mold and adjustable bracket;

[0037] Figure 11 This is a schematic diagram of the end cap mold structure;

[0038] Figure 12 for Figure 11 Bottom structure diagram

[0039] Figure 13 This is a schematic diagram of the assembly structure of the inner mold and mold core;

[0040] Figure 14 This is a schematic diagram of the end cap upper mold structure;

[0041] Figure 15 This is a schematic diagram of the end cap lower mold structure;

[0042] Figure 16 This is a schematic diagram of the finished product, including the rubber tube with end caps. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings.

[0044] refer to Figures 1 to 16 The mold and demolding method for producing the rubber cylinder with end caps shown are as follows: First, as... Figure 16 As shown, the rubber cylinder 400 with end cap of this application mainly includes a rubber cylinder 410 and an end cap 420. One end of the rubber cylinder 410 is open, and the end cap 420 can cover the open end of the rubber cylinder 410. Both the closed end of the rubber cylinder 410 and the end cap 420 have through holes 430. Therefore, the mold of this application mainly includes a cylinder mold 100 and an end cap mold 200.

[0045] The cylindrical mold 100 includes an outer mold 110, an inner mold 120, a top mold 130, and a bottom mold 140. The inner mold 120 includes at least two opposing sliding inner mold cores 121 and at least two opposing fixed inner mold cores 122, with the fixed inner mold cores 122 and the sliding inner mold cores 121 spaced apart. The inner mold 120 has a core-pulling cavity 123 and an intermediate mold core 150 adapted to the core-pulling cavity 123. The intermediate mold core 150 is tapered, wider at the top and narrower at the bottom, and has a sliding fit structure with the sliding inner mold cores 121. The top mold 130 has a mutually fitting connection structure with the outer mold 110, as well as with each sliding inner mold core 121 and the fixed inner mold core 122. The outer mold 110, inner mold 120, top mold 130, and bottom mold 140 together form a cylindrical cavity 160.

[0046] The end cap mold 200 includes an upper end cap mold 210 and a lower end cap mold 220. The end cap mold 200 is equipped with an adjustable bracket 300, which can support the end cap mold 200 on the adjustable bracket 300 and adjust and fix its tilt angle through the adjustable bracket 300.

[0047] Key reference Figures 10 to 15 In this application, the adjustable bracket 300 has a movable base 310 and a lifting seat 320 supported on the movable base 310. The top of the lifting seat 320 has a fixed seat 330. The fixed seat 330 and the end cover mold 200 have a rotating support structure and a locking structure that cooperate with each other. As shown in the figure, the movable base 310 has universal casters, the lifting seat 320 adopts a conventional hydraulic fork structure, the fixed seat 330 has symmetrically arranged bearings 331 on both sides of the top, and the end cap mold 200 has rotating shafts 250 on both sides that are adapted to the bearings 331. It should be noted that in order to ensure the stability of the end cap mold 200 during rotation, both the upper end cap mold 210 and the lower end cap mold 220 have connecting holes 230 corresponding to the rotating shafts 250. That is, the rotating shafts 250 are connected to both the upper end cap mold 210 and the lower end cap mold 220 and then supported on the bearings 331. At the same time, the fixed seat 330 has a clamping screw 332 facing the rotating shaft 250. When the clamping screw 332 is clamped to the rotating shaft 250, the end cap mold 200 is in a relatively fixed state. When the clamping screw 332 is loosened, the angle of the end cap mold 200 can be adjusted as needed.

[0048] As shown in the figure, the upper mold 210 and the lower mold 220 of the end cap together form the end cap cavity 260. The end cap cavity 260 has an end mold channel 211, which is openable. It should be noted that the end mold channel 211 is mainly formed on the upper mold 210 of the end cap and is roughly "V" shaped. At the same time, three exhaust valves 214 are provided on the upper mold 210 of the end cap. The exhaust valves 214 and the end mold channel 211 are located on opposite sides of the radial direction of the end cap cavity 260. That is, when the end cap mold 200 is set vertically, the exhaust valves 214 are at the highest position of the end cap cavity 260. This makes it easier for air to be discharged and for the glue to be injected for molding. Furthermore, the exhaust valves 214 are located on the upper mold 210 of the end cap, which is also beneficial for the molding of the end cap.

[0049] To ensure the stability of the end cap mold 200, multiple main connecting bolts are provided on the outside of the end cap cavity 260 to connect and fix the upper end cap mold 210 and the lower end cap mold 220, as shown in the figure. The multiple main connecting bolts pass through the bottom of the lower end cap mold 220 and connect and fix it to the upper end cap mold 210. Furthermore, within the end cap cavity 260, secondary connecting bolts 213 are provided. The upper end cap mold 210 has corresponding through holes 212, which are stepped, with a larger inner diameter and a smaller outer diameter. The lower end cap mold 220 has corresponding through holes 212. The column 221 is adapted to have a connecting screw hole 222 that is threaded to the auxiliary connecting bolt 213. When the upper mold 210 and the lower mold 220 of the end cap are fitted together, the column 221 can be inserted into the through hole 212. The connection stability between the upper mold 210 and the lower mold 220 of the end cap can be further improved by the threaded engagement of the auxiliary connecting bolt 213 with the connecting screw hole 222. In this embodiment, the position of the column 221 corresponds to the position of the through hole 430 on the end cap 420, thus forming the forming structure of the through hole 430.

[0050] Key reference Figures 1 to 9 In this application, the outer mold 110 has a graded structure, including at least two outer mold bodies 111. The outer mold bodies 111 are connected by flanges to each other, and the outer mold bodies 111 are connected to the top mold 130 and the bottom mold 140 of the cylinder. The outer mold bodies 111 are connected to each other, and the outer mold bodies 111 are connected to the bottom mold 140 of the cylinder by ejection structures.

[0051] As shown in the figure, the outer mold body 111 is generally a hollow columnar structure with flanges at both ends of its axial direction. The upper flange of the outer mold body 111 has blind holes 113 symmetrically arranged along its radial direction, and the lower flange of the outer mold body 111 has ejector screw holes 112 that are directly opposite to the blind holes 113. Correspondingly, the top mold 130 of the cylinder also has ejector screw holes that are corresponding to the blind holes 113. In this way, when it is necessary to remove it, the ejector screw can be screwed into the corresponding ejector screw hole 112 and continuously screwed in until it abuts against the blind hole 113 directly below, so that the upper part can be separated from the lower part quickly, thereby achieving the purpose of rapid demolding.

[0052] In this embodiment, the inner mold 120 has a multi-lobed structure, including two sliding inner mold cores 121 and two fixed inner mold cores 122. The middle mold core 150 is in the shape of a truncated pyramid. T-shaped guide rails 124 are provided on the opposite surfaces of the middle mold core 150 and the sliding inner mold cores 121 and the fixed inner mold cores 122. The sliding inner mold cores 121 and the fixed inner mold cores 122 have guide rail grooves 125 that cooperate with the T-shaped guide rails 124. The top of the guide rail grooves 125 is open, which makes it easy for the middle mold core 150 to be directly inserted into the core-pulling cavity 123 from above.

[0053] It should be noted that, in order to ensure that the sliding inner mold core 122 can retract under the action of the intermediate mold core 150, the chord length of the sliding inner mold core 121 is less than the chord length of the fixed inner mold core 122. That is, the inner side of the sliding inner mold core 121 is located between the two fixed inner mold cores 122. To further improve the reliability of the retraction, the sliding inner mold core 121 has a tapered structure with a larger upper part and a smaller lower part in the length direction. That is, the chord length of the sliding inner mold core 121 gradually decreases from top to bottom. When the sliding inner mold core 121 retracts, it is separated from the rubber tube body 410, which is convenient for removal.

[0054] Based on this, the intermediate mold core 150 and the sliding inner mold core 121 have a linkage structure. Specifically, the intermediate mold core 150 is a hollow structure with insertion holes 151 facing the sliding inner mold core 121. The insertion holes 151 are distributed along its length. At the same time, the insertion holes 151 are equipped with corresponding stop blocks 152. The top of the sliding inner mold core 121 has stop block fixing screw holes 1210 for fixing the stop blocks 152. Thus, when the intermediate mold core 150 is lifted to a certain height, the sliding inner mold core 121 separates from the rubber cylinder body 410. At this time, the fixing stop block 152 is inserted into the insertion hole 151 and fixedly connected to the sliding inner mold core 121. When the intermediate mold core 150 is lifted further, the sliding inner mold core 121 can be lifted out together.

[0055] The intermediate mold core 150 has a cavity 154 arranged along its axis in the middle. The cavity 154 can be used to install and fix the air pipe 170. During the extrusion process, hot air is introduced into the air pipe 170 to achieve rapid heating and heat preservation of the mold. During the cooling process, cold air can be introduced into the air pipe 170 to meet more cooling needs. In addition, the hollow structure of the intermediate mold core 150 is also conducive to the rapid adjustment and control of the inner mold temperature.

[0056] like Figure 2 and Figure 9 As shown, the injection port of the cylindrical cavity 160 is located at the bottom, and the bottom mold 140 of the cylindrical body has an injection hole 142 in the middle, which is used to install and connect the extrusion tube 180.

[0057] To ensure the structural quality of the cylindrical cavity 160 and prevent the inner mold 120 from skewing, the bottom of the intermediate mold core 150 has evenly distributed tapered pins 153, and the bottom mold 140 of the cylindrical body has positioning holes 141 that transition with the tapered pins 153.

[0058] When installing the cylindrical mold 100, first fix the bottom mold 140 of the cylindrical body on the mounting base 500, connect and fix the bottom outer mold body 111 of the cylindrical body to the bottom mold 140, put the assembled inner mold 120 into the outer mold body 111, then install the upper outer mold body 111, and finally install the top mold 130 of the cylindrical body. Connect the top mold 130 of the cylindrical body to the inner mold 120 and the top outer mold body 111 respectively.

[0059] Based on the aforementioned mold for producing a cylindrical body with end caps, this application also proposes a corresponding demolding method, mainly for demolding the cylindrical body mold 100, which specifically includes the following steps:

[0060] The first step is to hoist the cylindrical mold 100 into the foundation pit and keep it vertically stable to prevent it from tilting.

[0061] The second step is to remove the connecting bolts between the top mold 130 and the outer mold 110 (i.e., the uppermost outer mold body 111) and use the set screws to separate the top mold 130 and the outer mold 110 to prevent them from sticking together.

[0062] The third step is to hoist the top mold 130 and the intermediate mold core 150 of the cylinder as a whole. The intermediate mold core 150 drives the sliding inner mold core 121 to retract inward. When the top mold 130 of the cylinder is hoisted a distance L (this distance is usually 400-600mm), the sliding inner mold core 121 retracts inward by about 5-10mm, realizing the separation of the sliding inner mold core 121 from the rubber cylinder 410. One of the insertion holes 151 is just flush with the upper end face of the sliding inner mold core 121. Then, the sliding inner mold core 121 and the intermediate mold core 150 are connected by the stop block 152. Continue to lift the top mold 130 of the cylinder, and the sliding inner mold core 121 can be hoisted out together.

[0063] The third step is to remove the fixed inner mold core 122 and the outer mold body 111 located above, and then lift out the rubber cylinder body 410.

[0064] Fifth step: Finally, remove the bottom outer mold body 111 and the bottom cylinder mold 140.

[0065] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. Those skilled in the art, under the guidance of the present invention, can make various similar representations without departing from the spirit and claims of the present invention, and such modifications all fall within the protection scope of the present invention.

Claims

1. A mold for producing a rubber cylinder with end caps, characterized in that: The system includes a cylindrical mold (100) and an end cap mold (200). The cylindrical mold (100) includes an outer mold (110), an inner mold (120), a top mold (130), and a bottom mold (140). The inner mold (120) includes two opposing sliding inner mold cores (121) and two opposing fixed inner mold cores (122), with the fixed inner mold cores (122) and the sliding inner mold cores (121) spaced apart. The inner mold (120) has a core-pulling cavity (123) and an intermediate mold core (150) adapted to the core-pulling cavity (123). The intermediate mold core (150) is tapered with a larger upper part and a smaller lower part, and has a sliding fit structure with the sliding inner mold cores (121). The end cap mold (200) includes an upper end cap mold (210) and a lower end cap mold (220). The end cap mold (200) is equipped with an adjustable bracket (300). The end cap mold (200) can be supported on the adjustable bracket (300) and its tilt angle can be adjusted and fixed by the adjustable bracket (300). The intermediate mold core (150) is in the shape of a truncated pyramid. T-shaped guide rails (124) are provided on the surfaces of the intermediate mold core (150) opposite to the sliding inner mold core (121) and the fixed inner mold core (122). The sliding inner mold core (121) and the fixed inner mold core (122) have guide rail grooves (125) that cooperate with the T-shaped guide rails (124). The intermediate mold core (150) and the sliding inner mold core (121) have a linkage structure; The intermediate mold core (150) has a hollow structure and has an insertion hole (151) facing the sliding inner mold core (121). The insertion hole (151) is equipped with a stop block (152) that is adapted to it. The top of the sliding inner mold core (121) has a stop block fixing screw hole (1210) for fixing the stop block (152).

2. The mold for producing a rubber cylinder with end caps according to claim 1, characterized in that: The adjustable bracket (300) has a movable base (310) and a lifting seat (320) supported on the movable base (310). The lifting seat (320) has a fixed seat (330) on top. The fixed seat (330) and the end cap mold (200) have a rotating support structure and a locking structure that cooperate with each other.

3. The mold for producing a rubber cylinder with end caps according to claim 1 or 2, characterized in that: The end cap upper mold (210) has an openable end mold channel (211), which is V-shaped.

4. The mold for producing a rubber cylinder with end caps according to claim 1, characterized in that: The outer mold (110) has a graded structure, including at least two outer mold bodies (111). The outer mold bodies (111) are connected by flanges, and the outer mold bodies (111) are connected to the top mold (130) and the bottom mold (140) of the cylinder. The outer mold bodies (111) are connected by ejection structures, and the outer mold bodies (111) are connected to the bottom mold (140) of the cylinder.

5. The mold for producing a rubber cylinder with end caps according to claim 1 or 4, characterized in that: The top mold (130) of the cylinder and the outer mold (110) have mutually cooperating connection structures, as well as with each sliding inner mold core (121) and the fixed inner mold core (122).

6. The mold for producing a rubber cylinder with end caps according to claim 1 or 4, characterized in that: The bottom of the intermediate mold core (150) has evenly distributed tapered pins (153), and the bottom mold of the cylinder (140) has positioning holes (141) that transition with the tapered pins (153).

7. The demolding method for the production mold of the rubber cylinder with end caps according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Hoist the cylindrical mold (100) into the foundation pit and keep it vertically stable; S2. Remove the connecting bolts between the top mold (130) and the outer mold (110) of the cylinder, and use the set screws to separate the top mold (130) and the outer mold (110) of the cylinder; S3. The top mold (130) and the middle mold core (150) of the cylinder are hoisted together. The middle mold core (150) drives the sliding inner mold core (121) to retract inward. After the top mold (130) of the cylinder is hoisted a distance L, the sliding inner mold core (121) and the middle mold core (150) are connected by the stop block (152). The top mold (130) of the cylinder is continued to be lifted, and the sliding inner mold core (121) is hoisted out together. S4. Remove the fixed inner mold core (122) and the outer mold body (111) located above, and then lift out the rubber cylinder body; S5. Finally, remove the bottom outer mold body (111).

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