Inner mold for pipe fitting forming

Abstract

The utility model relates to the field of forming dies, and discloses an inner die for pipe fitting forming, which comprises a plurality of side plates, every two adjacent side plates are mutually pivoted, all the side plates are encircled to form an annular structure, and the outer side wall surface of the annular structure is used for forming the inner wall of a pipe fitting; the shrinking mechanism is arranged in an annular area defined by the side plates, and the shrinking mechanism is configured to drive at least one side plate to rotate along the pivot joint axis until the included angle between the side plate and the adjacent side plate is reduced, so that other side plates have spaces folded towards the inner side, and the annular structure is shrunk. The retracting mechanism provides driving force for the adjacent side plates to be folded inwards, so that after at least one side plate is driven by the driving mechanism to be folded inwards, the folded side plate provides a certain receding space for other side plates, and the other side plates have spaces folded inwards. After being folded, the whole inner mold shrinks to a certain degree, a gap exists between the contracted inner mold and a formed pipe fitting, and demolding is convenient.

Description

Technical Field

[0001] This utility model relates to the field of molding dies, and in particular to an inner mold for forming pipe fittings. Background Technology

[0002] Cement pipes are prefabricated pipes made of cement and steel bars, utilizing the principle of centrifugal force from utility poles. Also known as cement pressure pipes or reinforced concrete pipes, cement pipes can be used as drainage pipes in urban construction, for sewage discharge, flood control and drainage, as well as for water supply in some special factories and mines, and for farmland wells.

[0003] During the molding process of cement pipes, inner and outer molds are required for the inner and outer walls of the pipe, respectively. The inner mold is cylindrical, and the outer mold has a cylindrical cavity slightly larger than the inner mold. After the inner mold is placed inside the outer mold, a tubular cavity is formed between them. Cement is then filled into the cavity between the inner and outer molds to form the cement pipe. When it is necessary to remove the cement pipe, the outer mold is first opened, and then the cement pipe is taken out. However, the inner wall of the cement pipe is adhered to the mold, making it difficult to separate the cement pipe from the inner mold and thus difficult to demold. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an inner mold for pipe forming, which solves the problem that the existing cement pipe is difficult to separate from the inner mold after forming and is difficult to demold.

[0005] To achieve the above and other related objectives, this utility model provides an inner mold for forming pipe fittings, comprising:

[0006] Multiple side plates are pivotally connected to each other in pairs, and all the side plates together form a ring structure. The outer wall of the ring structure is used for forming the inner wall of the pipe to be formed.

[0007] A retraction mechanism is disposed within the annular area enclosed by the side plates. The retraction mechanism is configured to drive at least one of the side plates to rotate along the pivot axis until the included angle between it and its adjacent side plate decreases, so that the other side plates have space to fold inward, thereby retracting the annular structure formed by the side plates.

[0008] By adopting the above technical solution, the annular structure formed by the side plates forms the main body of the inner mold for forming the pipe fitting. The adjacent side plates are pivotally connected to each other, so that the adjacent side plates have a connection structure that can be folded inward. The shrinkage mechanism provides the driving force for the adjacent side plates to fold inward, so that at least one side plate is driven by the driving mechanism to fold inward. After the folded side plate provides a certain clearance space for other side plates, so that other side plates have space to fold inward. Overall, after the multiple side plates of the inner mold are folded, the whole exhibits a certain shrinkage relative to the original annular structure. There is a gap between the folded inner mold and the formed pipe fitting, which can facilitate the separation of the inner mold and the formed pipe fitting, that is, facilitate demolding.

[0009] In one embodiment of this application, the side plate includes: a fixed plate; a driven plate pivotally disposed on one side of the fixed plate; and a folding plate pivotally disposed on the side of the fixed plate opposite to the driven plate; the driven plate and the folding plate are independent of each other.

[0010] By adopting the above technical solution, the fixed plate serves as a fulcrum, and the driven plate is driven to fold inward by the retraction mechanism. The folded driven plate provides a certain amount of clearance space, allowing the folding plate to be manually folded inward.

[0011] In one embodiment of this application, the retraction mechanism includes: a drive shaft, centrally located inside the annular structure, with the axial direction of the drive shaft coinciding with the central axis of the annular structure; a first connecting rod, horizontally located on the side of the drive shaft, with one end of the first connecting rod fixedly connected to the side of the drive shaft; a second connecting rod, horizontally located inside the driven plate, with one end fixedly connected to the inner wall of the driven plate and the other end pivotally connected to the end of the first connecting rod facing away from the drive shaft; and a connecting member, horizontally located on the side of the drive shaft, with one end pivotally connected to the drive shaft and the other end fixedly connected to the fixed plate.

[0012] By adopting the above technical solution, the connecting component fixes the distance between the drive shaft and the fixed plate. When the drive shaft rotates, it can drive the first link and the second link to fold relative to each other, thereby driving the driven plate to fold inward.

[0013] In one embodiment of this application, there are specifically two connectors, and the two connectors are connected to the fixing plate at the ends of the fixing plate near the driven plate and the fixing plate near the folding plate, respectively.

[0014] By adopting the above technical solution, a triangle is formed between the two connectors and the fixing plate, which improves the stability of the structure and prevents the connectors from deforming.

[0015] In one embodiment of this application, a drive rod is connected to the upper end of the drive shaft, and the drive rod is perpendicular to the drive shaft.

[0016] By adopting the above technical solution, the drive rod drives the drive shaft to rotate, providing a longer lever arm and improving the effort-saving effect during contraction.

[0017] In one embodiment of this application, an annular component is provided at the upper end of the drive shaft, and the drive rod is pluggably disposed within the annular component and has a clearance fit with the annular component.

[0018] By adopting the above technical solution, the drive rod is detachably connected to the drive shaft through a ring-shaped component. In the working state, the drive rod can be removed to prevent the drive rod from interfering with the external mold during molding.

[0019] In one embodiment of this application, a locking member is detachably provided between the adjacent side plates. The locking member has a first locking pin and a second locking pin at both ends. The first connecting rod has a first pin hole that engages with the first locking pin, and the second connecting rod has a second pin hole that engages with the second locking pin.

[0020] By adopting the above technical solution, in the working state, the first locking pin and the second locking pin of the locking component are inserted into the first pin hole and the second pin hole respectively, so that the first connecting rod and the second connecting rod cannot be folded relative to each other, that is, the shrinking mechanism cannot operate, the annular structure formed by the side plate cannot shrink, and prevent the pressure of cement material in the working state from pressing the inner mold, causing the side plate to be pressed to fold, and the cement material to leak into the inner mold.

[0021] In one embodiment of this application, at least two of the first link, the second link, and the connector are provided in the vertical direction.

[0022] By adopting the above technical solution, due to the long length of the pipe fitting, adding multiple sets of first connecting rods, second connecting rods, and connecting parts in the vertical direction can improve the stability of the inner mold structure.

[0023] In one embodiment of this application, each of the side plates is provided with a hinge on the side facing the retraction mechanism, and the hinge is connected to the inner sidewall of the adjacent side plate.

[0024] By adopting the above technical solution, in the working state, the side plate isolates the cement material from the hinge. If the hinge is set on the outside, it will mix with the cement material, causing the hinge to be unable to open and close normally.

[0025] In one embodiment of this application, the inner sidewall of each of the side plates is provided with reinforcing ribs.

[0026] By adopting the above technical solution, the stability of the internal mold structure has been further improved.

[0027] As described above, the inner mold for pipe forming of this utility model has the following beneficial effects:

[0028] 1. The annular structure formed by the side plates together forms the main body of the inner mold for forming the pipe fitting. The adjacent side plates are pivotally connected to each other, so that the adjacent side plates have a connection structure that can be folded inward. The shrinkage mechanism provides the driving force for the adjacent side plates to fold inward, so that at least one side plate is driven by the driving mechanism to fold inward. After the folded side plate provides a certain clearance space for other side plates, so that other side plates have space to fold inward. Overall, after the multiple side plates of the inner mold are folded, the whole exhibits a certain shrinkage relative to the original annular structure. There is a gap between the folded inner mold and the formed pipe fitting, which can facilitate the separation of the inner mold and the formed pipe fitting, that is, facilitate demolding. Attached Figure Description

[0029] Figure 1 The image shown is a perspective view of an inner mold for forming pipe fittings according to an embodiment of this application.

[0030] Figure 2 The diagram shown is an internal structure diagram of an inner mold used for forming pipe fittings according to an embodiment of this application.

[0031] Figure 3 The diagram shown is an internal structural diagram of an inner mold for forming pipe fittings in an embodiment of this application after a locking element has been installed.

[0032] Explanation of reference numerals in the attached figures

[0033] 1. Side plate; 11. Fixed plate; 12. Driven plate; 13. Folding plate; 14. Hinge; 2. Ring structure; 3. Retraction mechanism; 31. Drive shaft; 32. First connecting rod; 321. First pin hole; 33. Second connecting rod; 3321. Second pin hole; 34. Connecting piece; 35. Drive rod; 36. Ring piece; 37. Locking piece; 371. First locking pin; 372. Second locking pin. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] Example

[0039] Please see Figure 1-3 This utility model provides an inner mold for forming pipe fittings, comprising:

[0040] Multiple side plates 1 are pivotally connected to each other in pairs, and all the side plates 1 are enclosed to form a ring structure 2. The outer wall of the ring structure 2 is used for the inner wall forming of the pipe to be formed.

[0041] The shrinking mechanism 3 is disposed in the annular area enclosed by the side plates 1. The shrinking mechanism 3 is configured to drive at least one side plate 1 to rotate along the pivot axis until the included angle between it and its adjacent side plate 1 decreases, so that the other side plates 1 have space to fold inward, thereby shrinking the annular structure 2 formed by the side plates 1.

[0042] In this way, the annular structure 2 formed by the side plates 1 forms the main body of the inner mold for forming the pipe fitting. The adjacent side plates 1 are pivotally connected to each other, so that the adjacent side plates 1 have a connection structure that can be folded inward. The shrinkage mechanism 3 provides the driving force for the adjacent side plates 1 to fold inward, so that at least one side plate 1 is driven by the driving mechanism to fold inward. After the folded side plate 1 provides a certain clearance space for other side plates 1, so that other side plates 1 have space to fold inward. Overall, after the multiple side plates 1 of the inner mold are folded, the whole exhibits a certain shrinkage relative to the original annular structure 2. There is a gap between the folded inner mold and the formed pipe fitting, which can facilitate the separation of the inner mold and the formed pipe fitting, that is, facilitate demolding.

[0043] Specifically, the side plate 1 includes: a fixed plate 11; a driven plate 12, pivotally disposed on one side of the fixed plate 11; and a folding plate 13, pivotally disposed on the side of the fixed plate 11 facing away from the driven plate 12; the driven plate 12 and the folding plate 13 are independent of each other.

[0044] In this way, the fixed plate 11 serves as a fulcrum, and the driven plate 12 is driven by the retraction mechanism 3 to fold inward. The folded driven plate 12 provides a certain amount of clearance space, so that the folding plate 13 can be manually folded inward.

[0045] Specifically, the retraction mechanism 3 includes: a drive shaft 31, centrally located inside the annular structure 2, with the axis of the drive shaft 31 coinciding with the central axis of the annular structure 2; a first connecting rod 32, horizontally located on the side of the drive shaft 31, with its end fixedly connected to the side of the drive shaft 31; a second connecting rod 33, horizontally located inside the driven plate 12, with one end fixedly connected to the inner wall of the driven plate 12 and the other end pivotally connected to the end of the first connecting rod 32 facing away from the drive shaft 31; and a connecting member 34, horizontally located on the side of the drive shaft 31, with one end pivotally connected to the drive shaft 31 and the other end fixedly connected to the fixed plate 11.

[0046] In this way, the connecting piece 34 fixes the distance between the drive shaft 31 and the fixed plate 11. When the drive shaft 31 rotates, it can drive the first connecting rod 32 and the second connecting rod 33 to fold relative to each other, thereby driving the driven plate 12 to fold inward.

[0047] It should be noted that there are two connectors 34. The two connectors 34 are connected to the fixed plate 11 at the end of the fixed plate 11 near the driven plate 12 and the end of the fixed plate 11 near the folding plate 13, respectively.

[0048] In this way, the two connectors 34 and the fixing plate 11 form a triangle, which improves the stability of the structure and prevents the connectors 34 from deforming.

[0049] In addition, a drive rod 35 is connected to the upper end of the drive shaft 31, and the drive rod 35 is perpendicular to the drive shaft 31.

[0050] In this way, the drive rod 35 drives the drive shaft 31 to rotate, providing a longer lever arm and improving the effort-saving effect during contraction.

[0051] Specifically, an annular component 36 is provided at the upper end of the drive shaft 31, and the drive rod 35 is pluggably disposed in the annular component 36 and is clearance-fitted with the annular component 36.

[0052] In this way, the drive rod 35 is detachably connected to the drive shaft 31 via the annular part 36. In the working state, the drive rod 35 can be removed to prevent the drive rod 35 from interfering with the external mold during molding.

[0053] In addition, a locking member 37 is detachably provided between adjacent side plates 1. The locking member 37 has a first locking pin 371 and a second locking pin 372 at both ends. The first connecting rod 32 has a first pin hole 321 that is inserted and engaged with the first locking pin 371. The second connecting rod 33 has a second pin hole 3321 that is inserted and engaged with the second locking pin 372.

[0054] In this way, when the locking member 37 is in working condition, the first locking pin 371 and the second locking pin 372 are respectively inserted into the first pin hole 321 and the second pin hole 3321, so that the first connecting rod 32 and the second connecting rod 33 cannot be folded relative to each other, that is, the shrinking mechanism 3 cannot operate, and the annular structure 2 formed by the side plate 1 cannot shrink, thus preventing the pressure of the cement material in the working condition from pressing the inner mold and causing the side plate 1 to be pressed to fold, and the cement material to leak into the inner mold.

[0055] Among them, at least two of the first link 32, the second link 33, and the connector 34 are provided in the vertical direction.

[0056] Thus, due to the long length of the pipe, adding multiple sets of first connecting rods 32, second connecting rods 33, and connecting parts 34 in the vertical direction can improve the stability of the inner mold structure.

[0057] It should be noted that each side plate 1 is provided with a hinge 14 on the side facing the retraction mechanism 3, and the hinge 14 is connected to the inner side wall of the adjacent side plate 1.

[0058] In this way, during operation, the side plate 1 isolates the cement material from the hinge 14. If the hinge 14 is located on the outside, it will mix with the cement material, causing the hinge 14 to be unable to open and close normally.

[0059] In addition, reinforcing ribs are provided on the inner sidewalls of each side plate 1.

[0060] This further improves the stability of the internal mold structure.

[0061] In summary, in this invention, the annular structure 2 formed by the side plates 1 constitutes the main body of the inner mold for forming the pipe fitting. Adjacent side plates 1 are pivotally connected, allowing them to fold inwards. The shrinking mechanism 3 provides the driving force for the adjacent side plates 1 to fold inwards, ensuring that at least one side plate 1 is folded inwards by the driving mechanism. The folded side plate 1 provides space for other side plates 1 to fold inwards. Overall, after the multiple side plates 1 of the inner mold are folded, the entire structure exhibits a certain degree of shrinkage relative to the original annular structure 2. A gap exists between the folded inner mold and the formed pipe fitting, facilitating separation of the inner mold and the formed pipe fitting, thus enabling easy demolding. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0062] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An inner mold for forming pipe fittings, characterized in that, include: Multiple side plates (1), adjacent side plates (1) are hinged to each other, and all the side plates (1) are enclosed to form an annular structure (2), the outer wall of the annular structure (2) is used for the inner wall forming of the pipe to be formed; A shrinking mechanism (3) is provided in the annular area enclosed by the side plates (1). The shrinking mechanism (3) is configured to drive at least one of the side plates (1) to rotate along the hinge axis until the included angle between it and its adjacent side plate (1) decreases, so that the other side plates (1) have space to fold inward, thereby shrinking the annular structure (2) formed by the side plates (1).

2. The inner mold for forming pipe fittings according to claim 1, characterized in that: The side plate (1) includes: a fixed plate (11); a driven plate (12) hinged to one side of the fixed plate (11); and a folding plate (13) hinged to the side of the fixed plate (11) facing away from the driven plate (12); the driven plate (12) and the folding plate (13) are independent of each other.

3. The inner mold for forming pipe fittings according to claim 2, characterized in that: The retraction mechanism (3) includes: a drive shaft (31), centrally located inside the annular structure (2), with the axial direction of the drive shaft (31) coinciding with the central axis of the annular structure (2); a first connecting rod (32), horizontally located on the side of the drive shaft (31), with the end of the first connecting rod (32) fixedly connected to the side of the drive shaft (31); a second connecting rod (33), horizontally located inside the driven plate (12), with one end of the second connecting rod (33) fixedly connected to the inner wall of the driven plate (12) and the other end pivotally connected to the end of the first connecting rod (32) facing away from the drive shaft (31); and a connecting piece (34), horizontally located on the side of the drive shaft (31), with one end of the connecting piece (34) pivotally connected to the drive shaft (31) and the other end fixedly connected to the fixed plate (11).

4. The inner mold for forming pipe fittings according to claim 3, characterized in that: Specifically, there are two connectors (34), and the two connectors (34) are connected to the fixing plate (11) at the end of the fixing plate (11) near the driven plate (12) and the end of the fixing plate (11) near the folding plate (13), respectively.

5. The inner mold for forming pipe fittings according to claim 3, characterized in that: The upper end of the drive shaft (31) is connected to a drive rod (35), and the drive rod (35) is perpendicular to the drive shaft (31).

6. The inner mold for forming pipe fittings according to claim 5, characterized in that: The upper end of the drive shaft (31) is provided with an annular part (36), and the drive rod (35) is pluggably disposed in the annular part (36) and has a clearance fit with the annular part (36).

7. The inner mold for forming pipe fittings according to claim 3, characterized in that: A locking member (37) is detachably provided between the adjacent side plates (1). The locking member (37) has a first locking pin (371) and a second locking pin (372) at both ends. The first connecting rod (32) has a first pin hole (321) that is inserted into the first locking pin (371). The second connecting rod (33) has a second pin hole (3321) that is inserted into the second locking pin (372).

8. The inner mold for forming pipe fittings according to claim 3, characterized in that: At least two of the first link (32), the second link (33), and the connector (34) are provided in the vertical direction.

9. An inner mold for forming pipe fittings according to any one of claims 2-8, characterized in that: Each of the side plates (1) is provided with a hinge (14) on the side facing the retraction mechanism (3), and the hinge (14) is connected to the inner sidewall of the adjacent side plate (1).

10. An inner mold for forming pipe fittings according to any one of claims 2-8, characterized in that: Each of the side plates (1) has reinforcing ribs on its inner sidewall.

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