Inflation demolding equipment capable of being used for corrugated pipe production

Abstract

The utility model belongs to the technical field of equipment for rubber product production, and particularly relates to inflatable demolding equipment for corrugated pipe production. The air inflation demolding equipment structurally comprises an inner mold and a connecting pipe, and further comprises a cavity unit provided with the connecting pipe, a groove hole unit arranged on the inner mold and used for conducting air inflation operation between a corrugated pipe and the inner mold, and a round pipe arranged on the cavity unit and used for being connected with the end section of the corrugated pipe in a sleeved mode. The air outlet pipe unit is arranged on the cavity unit, located in the circular pipe and used for being connected with the groove hole unit in an inserted mode.

Description

Technical Field

[0001] This application belongs to the technical field of equipment for rubber product manufacturing, and in particular relates to an inflatable demolding device that can be used in the production of corrugated pipes. Background Technology

[0002] A corrugated pipe is an elastic pipe with foldable corrugated sheets. The most common rubber corrugated pipes have the following advantages compared with ordinary rubber round pipes: 1. They provide a length extension function that the latter does not have; 2. They provide greater radial structural strength than the latter, making the pipe body less likely to be flattened.

[0003] The expansion and contraction direction of the aforementioned foldable corrugated sheet is along the length of the pipe, and the shape of the foldable corrugated sheet is a spiral or annular pattern. The general production method of rubber corrugated pipe is as follows: molten rubber material is first injected between the inner and outer molds, then the outer mold is opened, and finally the pipe and the inner mold are separated to obtain the rubber corrugated pipe.

[0004] However, because the inner mold has raised textures used to form the aforementioned foldable corrugated sheets, the separation of the fitting and the inner mold is difficult to perform directly by hand. Generally, the separation operation can be completed using an air-inflated demolding method. The core step of this method is to inflate the space between the fitting and the inner mold, causing the fitting to expand slightly, thus making the separation operation simpler and more convenient.

[0005] Accordingly, the structure of the aforementioned inflatable demolding equipment mainly includes a special mold and an inflatable component suitable for the aforementioned inflatable demolding method.

[0006] For example, Chinese utility model patent with authorization announcement number CN219883072U and authorization announcement date of October 24, 2023 discloses a demolding device for a rubber corrugated pipe. Its main structural components include: an air hood, a high-pressure air source, a rubber corrugated pipe, a mold core, air holes, an airflow connector, a hose, a control valve, a clamping component, a control switch, a pressure limiting valve, a handle, and a pressure plate.

[0007] The demolding device in this utility model patent has the following advantages: opening the control valve allows airflow to be input from between the air cover and the mold core to between the rubber corrugated tube and the mold core, thereby inflating the corrugated tube and pulling it out from the mold core, which is simple and convenient.

[0008] However, in actual use, this demolding device still has at least the following problems of being impractical and inefficient, specifically manifested as follows:

[0009] First, inserting the air shroud into the gap between the bellows and the mold core is quite difficult. It requires turning the bellows opening outwards beforehand to proceed smoothly, which is rather troublesome.

[0010] Secondly, before and during the inflation process, clamps are needed to hold the bellows opening, which means the entire demolding operation must be done with both hands, which is impractical. Utility Model Content

[0011] This application provides an inflatable demolding device that can be used in the production of corrugated pipes. The technical problem it aims to solve is: how to make the demolding operation of corrugated pipes on the inner mold simpler and more efficient.

[0012] The technical solution adopted by this application to solve the above problems is: an inflatable demolding device that can be used for corrugated pipe production, the structure of which includes an inner mold and a connecting pipe, a cavity unit with the connecting pipe, a slotted unit disposed on the inner mold and used for inflating between the corrugated pipe and the inner mold, a round pipe disposed on the cavity unit and used for sleeved on the end section of the corrugated pipe, and an air outlet pipe unit disposed on the cavity unit and located inside the round pipe and used for inserting the slotted unit.

[0013] A further preferred technical solution is that the cavity unit includes two end plates, an annular sealing plate disposed on the two end plates, an air inlet disposed on one of the end plates for installing the connecting pipe, and an air outlet disposed on the other end plate for installing the air outlet pipe unit.

[0014] A further preferred technical solution is that the slotted unit includes an axial slot disposed on one end face of the inner mold for inserting the air outlet pipe unit, and a radial opening disposed on the axial slot for inflating the bellows.

[0015] A further preferred technical solution is that the air outlet pipe unit includes an air pipe disposed on the cavity unit and used for inserting the axially slotted air pipe.

[0016] A further preferred technical solution is that the circular tube and the air tube are arranged in pairs, with a quantity of 2-4 pairs, and the inner diameter of the circular tube is 4-10cm.

[0017] A further preferred technical solution is that the air outlet pipe unit also includes an internally threaded cover disposed on the air pipe.

[0018] A further preferred technical solution is that: the air outlet pipe unit further includes an elastic rubber sealing piece disposed on the inner annular surface of the air pipe; the slot unit further includes an axial rod disposed in the axial slot and used to connect the air pipe and the radial opening by bending the elastic rubber sealing piece.

[0019] A further preferred technical solution is that the cavity unit further includes a protruding post disposed on the same end plate as the connecting pipe, and an annular grip disposed on the protruding post.

[0020] A further preferred technical solution is that the slot unit further includes a positioning block disposed on the axial slot and used to prevent the circular tube from blocking the insertion depth of the radial opening by blocking the air outlet pipe unit.

[0021] A further preferred technical solution is that: the outer surface of the cavity unit is also provided with a cap anti-loss stud for screwing the internal threaded cap that has been removed from the air tube.

[0022] The beneficial effects of this application include at least the following three points.

[0023] First, the inflation path of the inflatable demolding device is sequentially a connecting pipe, a cavity unit, an air outlet pipe unit, and a slot unit. Moreover, after the corrugated pipe end section bulges up, it fits the inner ring surface of the round pipe. Therefore, a relatively high degree of sealing is not required between the corrugated pipe end section and the round pipe, and no other external clamping equipment is needed. This makes the entire demolding operation simple, efficient, and convenient, and can be completed with one hand.

[0024] Secondly, the air outlet unit and the slot unit do not require a relatively high degree of sealing. At this time, the end section of the corrugated pipe is already attached to the inner ring surface of the round pipe. The air leaking out from the gap between the two can also inflate the corrugated pipe, further reducing the difficulty of demolding and improving the efficiency of demolding.

[0025] Third, the inflatable demolding device includes multiple round tubes with different inner diameters, which are paired with the air outlet unit. The air outlet unit is closed when not in use, which makes the inflatable demolding device have a wide range of applications and practicality. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this application.

[0027] Figure 2 This is a schematic diagram of the cavity unit in this application, in which a circular tube is partially cut to expose the air tube.

[0028] Figure 3 This is a schematic diagram of the location and structure of the slotted unit in this application.

[0029] Figure 4 This is a schematic diagram of one shape of the bellows in this application.

[0030] Figure 5 This is a schematic diagram showing the location of the internal threaded cover in this application.

[0031] Figure 6 This is a schematic diagram of the shape of a positioning block for inserting depth in this application.

[0032] Figure 7 This is a schematic diagram of one shape of the elastic rubber sealing sheet in this application.

[0033] Figure 8 This is a schematic diagram showing the location of one type of stud used to prevent loss of the cover in this application.

[0034] The meanings of the markings in the diagram are as follows.

[0035] Corrugated pipe a, corrugated pipe end section a-1, corrugated section a-2, radial opening protrusion a-3, trimming position b;

[0036] Inner mold 11, connecting pipe 12, air pump hose 13;

[0037] Cavity unit 1, slot unit 2, round tube 3, air outlet unit 4;

[0038] End plate 101, annular sealing plate 102, air inlet 103, air outlet 104, protruding post 105, circular handle 106, and anti-loss stud for cover 107.

[0039] Axial slot 201, radial hole 202, axial rod 203, and positioning block 204 for insertion depth;

[0040] 401. Air tube, 402. Internal threaded cover, 403. Elastic rubber sealing sheet. Detailed Implementation

[0041] The following description is merely a preferred embodiment of this application and is not intended to limit the scope of this application.

[0042] like Figures 1-8 As shown, an inflatable demolding device for corrugated pipe production includes an inner mold 11 and a connecting pipe 12. It also includes a cavity unit 1 with the connecting pipe 12, a slotted unit 2 disposed on the inner mold 11 for inflating the corrugated pipe a and the inner mold 11, a circular pipe 3 disposed on the cavity unit 1 for fitting the end section a-1 of the corrugated pipe, and an air outlet pipe unit 4 disposed on the cavity unit 1 and located inside the circular pipe 3 for inserting the slotted unit 2.

[0043] In this embodiment, the inner mold 11 and the slotted unit 2 are a single unit, while the cavity unit 1, connecting pipe 12, round pipe 3, and air outlet pipe unit 4 are another single unit. The number of the former can be, for example, 2-4, which, together with multiple outer molds, air pump hoses 13, and air pumps, can complete the production of corrugated pipes of various specifications.

[0044] During each inflation operation, one corrugated tube a is removed. The width of the gap between the outer ring surface of the corrugated tube end section a-1 and the inner ring surface of the circular tube 3 during inflation is, for example, ≤1cm. Correspondingly, the outer ring surface of the air outlet unit 4 and the slot unit 2 do not need to be perfectly sealed; the width of the gap between them is, for example, ≤0.5cm.

[0045] The inflation and demolding operation is performed after the outer mold and corrugated tube a are separated. Air passes sequentially through the air pump, pump hose 13, connecting pipe 12, cavity unit 1, air outlet pipe unit 4, and slot unit 2, ultimately inflating and expanding the corrugated tube a, making it easier to separate the corrugated tube a from the inner mold 11. Even if the air pump is turned off during separation and the corrugated tube a is reattached to the inner mold 11, the previous expansion makes the demolding operation relatively more convenient.

[0046] In addition, the inner mold 11, outer mold, cavity unit 1, connecting pipe 12, round pipe 3 and air outlet pipe unit 4 are all made of metal, and the corrugated pipe a can be made of any one of nitrile rubber, fluororubber and silicone rubber.

[0047] Finally, during the entire inflation and demolding process, the circular tube 3 does not need to be inserted between the corrugated pipe end section a-1 and the inner mold 11; the inflation and demolding operation can be performed by holding the cavity unit 1 with one hand. Whether or not a control valve is installed on the air pump hose 13 is optional; the control valve can still be operated with one hand as described above.

[0048] The cavity unit 1 includes two end plates 101, an annular sealing plate 102 disposed on the two end plates 101, an air inlet 103 disposed on one of the end plates 101 for mounting the connecting pipe 12, and an air outlet 104 disposed on the other end plate 101 for mounting the air outlet pipe unit 4.

[0049] In this embodiment, the end plate 101 is circular in shape, and two end plates 101 and one annular sealing plate 102 are integrally formed. There is one air inlet 103 and multiple air outlets 104, which are located corresponding to the air outlet pipe unit 4.

[0050] Furthermore, the vent 104, the vent pipe unit 4, and the circular pipe 3 together form a complete venting structure, which is arranged in a uniform circumferential pattern around the center of the end plate 101. Only one of the vent pipe units 4 is used, while the remaining unused vent pipe units 4 are closed.

[0051] The slotted unit 2 includes an axial slot 201 disposed on one end face of the inner mold 11 for inserting the air outlet pipe unit 4, and a radial opening 202 disposed on the axial slot 201 for inflating the bellows a.

[0052] In this embodiment, the opening of the radial opening 202 makes it easy for a protrusion a-3 to form at the radial opening, which is not allowed to appear on qualified products of bellows.

[0053] On the other hand, the rough product of the corrugated pipe itself requires trimming and shearing operations at both ends to form the qualified product mentioned above. Therefore, combining the removal of the radial opening protrusion a-3 into the above-mentioned end trimming and shearing operation ensures that the appearance of the radial opening protrusion a-3 will not affect the normal production of the corrugated pipe, which is very ingenious and practical.

[0054] Therefore, the radial opening 202 is located relatively close to the end on the inner mold 11, so that the radial opening protrusion a-3 is formed on the straight tube-shaped corrugated pipe end section a-1, and finally the radial opening protrusion a-3 can be removed together with the uneven pipe end.

[0055] Correspondingly, existing common corrugated pipe products all have the same structural composition, including two corrugated pipe end sections a-1 at each end and a central corrugated section a-2, the latter being much longer than the former. The latter can be circular or spiral, while the former is a straight pipe with smooth inner and outer surfaces.

[0056] The air outlet unit 4 includes an air pipe 401 disposed on the cavity unit 1 and used for inserting the axial slot 201.

[0057] In this embodiment, when the device performs the inflation and demolding operation, the outlet end of the air pipe 401 is positioned further outward than the radial opening 202 to prevent the air pipe 401 from blocking the radial opening 202.

[0058] In addition, the cross-sectional shape of the air pipe 401 and the axial slot 201 is circular. The relatively small amount of gas leaking outward between the two can still enter between the bellows a and the inner mold 11. Therefore, at this time, the end section a-1 of the bellows has expanded and has attached to the inner ring surface of the circular pipe 3.

[0059] Therefore, there is no need for a high degree of air tightness between the air pipe 401 and the axial slot 201, and there is no circumferential angle restriction between the round pipe 3 and the inner mold 11, making the inflation and demolding operation simpler and more efficient.

[0060] The circular tube 3 and the air tube 401 are arranged in pairs, with a quantity of 2-4 pairs, and the inner diameter of the circular tube 3 is 4-10cm.

[0061] In this embodiment, since the thickness of the corrugated pipe a is not fixed, the inner mold 11 and the round pipe 3 are not the only pair. When one of the round pipes 3 is used, the selection criterion is the outer diameter at the end section a-1 of the corrugated pipe.

[0062] On the other hand, the multiple inner molds 11 have different diameters, but the diameters of the axial slots 201 on them are all the same, and the diameter of the air pipe 401 does not need to be changed, which can also reduce the production difficulty of the equipment.

[0063] The air outlet pipe unit 4 also includes an internally threaded cover 402 disposed on the air pipe 401.

[0064] In this embodiment, the outer ring surface of the air outlet end of the air pipe 401 is provided with a threaded end for mounting the internal threaded cover 402. When performing the inflation and demolding operation, the device only removes the internal threaded cover 402 from one of the air pipes 401, while the remaining air pipes 401 are sealed, thereby making the inflation operation more effective.

[0065] The air outlet pipe unit 4 also includes an elastic rubber sealing piece 403 disposed on the inner annular surface of the air pipe 401; the slot unit 2 also includes an axial rod 203 disposed in the axial slot 201 and used to connect the air pipe 401 and the radial opening 202 by bending the elastic rubber sealing piece 403.

[0066] In this embodiment, the elastic rubber sealing piece 403 is fan-shaped, and its strength in sealing the air pipe 401 is sufficient before the axial rod 203 bends it.

[0067] In addition, all the trachea 401 use the elastic rubber sealing sheet 403 or the internal threaded cap 402, each with its own advantages and disadvantages.

[0068] The advantage of using the elastic rubber sealing sheet 403 is that a control valve does not need to be installed on the air pump hose 13. The disadvantage is that its strength in sealing the air pipe 401 is relatively low.

[0069] The advantage of using the internal threaded cover 402 is that the air pipe 401 in the standby state has relatively high airtightness. The disadvantage is that a control valve must generally be installed on the air pump hose 13, and there is a risk that one of the internal threaded covers 402 removed may be lost.

[0070] The cavity unit 1 also includes a protruding post 105 disposed on the same end plate 101 as the connecting pipe 12, and an annular grip 106 disposed on the protruding post 105.

[0071] In this embodiment, the main function of the protruding post 105 is that, compared with the annular grip 106, the connecting tube 12 is a relatively more important core structure. The protruding post 105 protrudes appropriately on the end plate 101, so that the connecting tube 12 can be set in the annular grip 106 in an inward state.

[0072] Accordingly, when the device is stored and transported without being connected to the air pump hose 13, the connecting pipe 12 is less likely to be damaged.

[0073] Similarly, the length of the circular tube 3 is also greater than that of the air tube 401, so that the more important latter, which has higher dimensional accuracy requirements, can be protected by being recessed.

[0074] In addition, the main function of the circular grip 106 is that, regardless of which of the air outlet units 4 is triggered, the circular grip 106 can provide the operator with a gripping position located directly behind the air outlet unit 4, making the force application action of the bellows end section a-1 of the circular tube 3 more direct and effortless, and preventing the cavity unit 1 from tilting.

[0075] The slot unit 2 also includes a positioning block 204 disposed on the axial slot 201 and used to prevent the circular tube 3 from blocking the insertion depth of the radial opening 202 by blocking the air outlet unit 4.

[0076] In this embodiment, the circular tube 3 does indeed block the radial opening 202. In this case, the corrugated tube end section a-1 at the radial opening 202 is sleeved and limited by the circular tube 3, making it difficult for the rubber straight tube section at this point to expand, resulting in extremely high resistance during the inflation operation, which needs to be avoided.

[0077] Correspondingly, when the trachea 401 abuts against the insertion depth positioning block 204, the corrugated tube end section a-1 has been partially sleeved and limited by the round tube 3, but the sleeve length is relatively small. For details, please refer to the appendix. Figure 1 .

[0078] The positioning block 204 for the insertion depth can be a complete circular ring, or multiple fan-shaped blocks or cuboid blocks. Its radial dimension is relatively small and does not affect the insertion and bending effect of the axial rod 203 on the elastic rubber sealing piece 403.

[0079] The outer surface of the cavity unit 1 is also provided with a cover anti-loss stud 107 for screwing the internal thread cover 402 that has been removed from the air pipe 401.

[0080] In this embodiment, the anti-loss stud 107 for the cover can be set together with the protruding post 105 on the same end plate 101 to avoid the anti-loss stud 107 for the cover affecting the sleeve operation at the round tube 3.

[0081] The number of the anti-loss studs 107 for the cover is one, corresponding to one of the usage methods at the air outlet unit 4.

[0082] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this application. These are non-inventive modifications and are protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. An inflatable demolding device for corrugated pipe production, comprising an inner mold (11) and a connecting pipe (12), characterized in that: It also includes a cavity unit (1) with the connecting pipe (12), a slotted unit (2) disposed on the inner mold (11) and used for inflation between the corrugated pipe (a) and the inner mold (11), a round pipe (3) disposed on the cavity unit (1) and used for fitting the end section (a-1) of the corrugated pipe, and an air outlet pipe unit (4) disposed on the cavity unit (1), located inside the round pipe (3), and used for inserting the slotted unit (2).

2. The inflatable demolding device for corrugated pipe production according to claim 1, characterized in that: The cavity unit (1) includes two end plates (101), an annular sealing plate (102) disposed on the two end plates (101), an air inlet (103) disposed on one of the end plates (101) for installing the connecting pipe (12), and an air outlet (104) disposed on the other end plate (101) for installing the air outlet pipe unit (4).

3. The inflatable demolding device for corrugated pipe production according to claim 1, characterized in that: The slotted unit (2) includes an axial slot (201) disposed on one end face of the inner mold (11) for inserting the air outlet unit (4), and a radial opening (202) disposed on the axial slot (201) for inflating the bellows (a).

4. The inflatable demolding device for corrugated pipe production according to claim 3, characterized in that: The air outlet unit (4) includes an air pipe (401) disposed on the cavity unit (1) and used for inserting the axial slot (201).

5. The pneumatic demolding device for corrugated pipe production according to claim 4, characterized in that: The circular tube (3) and the air tube (401) are arranged in pairs, with a quantity of 2-4 pairs, and the inner diameter of the circular tube (3) is 4-10cm.

6. The pneumatic demolding device for corrugated pipe production according to claim 5, characterized in that: The air outlet pipe unit (4) also includes an internally threaded cover (402) disposed on the air pipe (401).

7. The pneumatic demolding device for corrugated pipe production according to claim 5, characterized in that: The air outlet unit (4) further includes an elastic rubber sealing piece (403) disposed on the inner annular surface of the air pipe (401); the slot unit (2) further includes an axial rod (203) disposed in the axial slot (201) and used to connect the air pipe (401) and the radial opening (202) by bending the elastic rubber sealing piece (403).

8. The inflatable demolding device for corrugated pipe production according to claim 2, characterized in that: The cavity unit (1) also includes a protruding post (105) disposed on the same end plate (101) as the connecting pipe (12), and an annular grip (106) disposed on the protruding post (105).

9. An inflatable demolding device for corrugated pipe production according to claim 3, characterized in that: The slot unit (2) also includes a positioning block (204) disposed on the axial slot (201) and used to prevent the round tube (3) from blocking the insertion depth of the radial opening (202) by blocking the air outlet unit (4).

10. An inflatable demolding device for corrugated pipe production according to claim 6, characterized in that: The outer surface of the cavity unit (1) is also provided with a cap anti-loss stud (107) for screwing the internal thread cap (402) that has been removed from the air pipe (401).

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