Closed inner mold

Abstract

The utility model discloses a closed inner mold which comprises a first side lower mold and a second side lower mold, the first side lower mold can be folded or unfolded on the second side lower mold along a set track, and the closed inner mold further comprises a locking mechanism capable of fixing the first side lower mold and the second side lower mold. The locking mechanism comprises a fixing part and a clamping part, the fixing part is rigidly connected to the first side lower die, the first end of the clamping part is rotationally connected with the second side lower die, and the second end of the clamping part is detachably clamped to the fixing part. The box girder inner mold is applied to the field of box girder inner molds, the first side lower mold and the second side lower mold can be conveniently fixed and separated, the construction efficiency can be greatly improved, and the labor intensity of constructors can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of box beam inner molds, in particular to a closed inner mold. Background Art

[0002] Box beam is a type of beam in bridge engineering, used to shape concrete bridges. Because it needs to withstand the pressure brought by concrete during pouring, the formwork needs to ensure overall stability. Therefore, the formwork needs to be adjusted in place and supported and fixed before pouring the beam body. After the beam body solidifies, the formwork needs to be demoulded and moved. The inner cavity of a small box beam is generally very small, with a height and width of less than 1m in most cases. Various support components need to be installed inside, which makes installation and disassembly very inconvenient.

[0003] Patent CN218621829U specifically describes the mechanical support method of the inner mold, which is equipped with a screw mechanism including an upper screw, a lower screw and a threaded sleeve to provide support, and cross beams are set at the top and bottom and fixed with bolts to stabilize the templates on the left and right sides. Although this structure is reliable, in actual application, personnel still have to enter the template to complete the installation of the screw mechanism and the installation of the upper and lower cross beam bolts. After the beam is made, the personnel enter the inner mold to remove all mechanical supports. This operation method requires a lot of adjustment and bolt installation work in the inner mold. Utility Model Content

[0004] In view of the deficiencies in the above-mentioned prior art, the utility model provides a closed inner mold, which can conveniently realize the fixation and separation between the first side lower mold and the second side lower mold while ensuring the stability of the inner mold, thereby reducing the workload during the installation and disassembly of the inner mold cavity, which can not only greatly improve the construction efficiency, but also effectively reduce the labor intensity of construction personnel.

[0005] To achieve the above-mentioned purpose, the utility model provides a closed inner mold, comprising a first side lower mold and a second side lower mold, wherein the first side lower mold can be closed or unfolded along a set track on the second side lower mold, and further comprising a locking mechanism capable of fixing the first side lower mold and the second side lower mold;

[0006] The locking mechanism includes a fixing portion and a clamping portion, wherein the fixing portion is rigidly connected to the first side lower mold, the first end of the clamping portion is rotationally connected to the second side lower mold, and the second end of the clamping portion is detachably clamped to the fixing portion.

[0007] In one embodiment, the first end of the fixing portion is fixedly connected to the first side lower mold, and the second end of the fixing portion has an opening;

[0008] The clamping part includes a pivot bolt and a locking nut, the nut end of the pivot bolt is rotatably connected to the second side lower mold, the screw rod of the pivot bolt is clamped into the opening, the locking nut is threadedly connected to the screw rod of the pivot bolt, and the locking nut abuts the top of the fixing part.

[0009] In one embodiment, an inner wall of the bottom of the second side lower mold is provided with an ear plate, the ear plate has a first pin hole, and the nut end of the movable bolt has a second pin hole;

[0010] The first pin shaft hole is coaxial with the second pin shaft hole, and the nut end of the swing bolt is rotatably connected to the ear plate through the pin shaft.

[0011] In one embodiment, the number of the ear plates is two, and the two ear plates are parallel, and the nut end of the hinge bolt is located between the two ear plates.

[0012] In one embodiment, the closed inner mold further comprises a first side upper mold and a second side upper mold, wherein a first end of the first side upper mold is hinged to the first side lower mold, and a first end of the second side upper mold is hinged to the second side lower mold;

[0013] An automatic limiting mechanism is provided between the second end of the first side upper mold and the second end of the second side upper mold to achieve lateral mechanical limiting between the first side upper mold and the second side upper mold.

[0014] In one embodiment, the automatic limiting mechanism includes a clamping member fixed to the inner side of the end of the first upper mold and a clamping groove on the inner side of the end of the second upper mold;

[0015] When the first side upper mold and the second side upper mold are rotated to open, the clamping member is automatically clamped into the clamping slot.

[0016] In one embodiment, a protrusion is provided on the clamping member, and the width of the slot of the clamping slot is greater than the width of the protrusion;

[0017] When the first side upper mold and the second side upper mold are rotated to open, the protrusion is gradually embedded in the slot until the side of the protrusion facing the first side upper mold is in contact with the slot wall of the slot, and there is a gap between the side of the protrusion facing the first side lower mold and the slot wall of the slot.

[0018] In one embodiment, the automatic limiting mechanism includes a first connecting seat fixed to the inner side of the end of the first upper mold and a second connecting seat fixed to the inner side of the end of the second upper mold;

[0019] When the first side upper mold and the second side upper mold are rotated to open, the first connecting seat and the second connecting seat are detachably connected through the connecting structure.

[0020] In one embodiment, the closed inner mold further includes a diagonal support member, one end of the diagonal support member is connected to the inner wall of the first upper mold, and the other end of the diagonal support member is connected to the inner wall of the second lower mold.

[0021] In one embodiment, the closed inner mold further includes an anti-floating mechanism, and the anti-floating mechanism includes a pull rod and a fixing block;

[0022] The fixing block is rigidly connected to the first side lower mold, the first end of the pull rod is connected to the fixing block, and the second end of the pull rod passes through the bottom of the second side lower mold and is connected to the external outer mold.

[0023] In one embodiment, the fixing block is connected to the fixing portion; or

[0024] The fixing block is integrally formed with the fixing portion; or

[0025] The fixing block is arranged separately from the fixing part.

[0026] Compared with the prior art, the utility model has the following beneficial technical effects:

[0027] 1. The utility model forms a locking mechanism between the first side lower mold and the second side lower mold through the fixing part and the clamping part. In the actual construction process, after entering the inner mold, the construction personnel only need to rotate the clamping part to connect and fix it with the fixing part to realize the connection and fixation of the first side lower mold and the second side lower mold. Before demoulding, they only need to rotate the clamping part to separate it from the fixing part. The operation is simple, which can greatly improve the construction efficiency and reduce the labor intensity of the construction personnel.

[0028] 2. In the preferred embodiment of the utility model, by arranging a diagonal support member between the first side upper mold and the second side lower mold, the vertical support limit and the lateral support limit of the inner mold can be realized at the same time, thereby improving the structural stability after the inner mold is opened;

[0029] 3. In the preferred embodiment of the utility model, the clamping part is formed by the movable bolt and the locking nut, which can not only ensure the clamping strength of the clamping part on the fixed part, but also the clamping part can be separated from the fixed part by only slightly rotating the locking nut during removal, which is convenient to operate. At the same time, the threaded connection between the movable bolt and the locking nut can also realize the downward movement of the bottom end of the first side lower mold, thereby eliminating the misalignment between the first side lower mold and the second side lower mold, improving the structural strength of the inner mold after expansion, and ensuring the forming quality of the box beam;

[0030] 4. In the preferred embodiment of the utility model, a clamping member and a clamping groove are arranged on the inner side of the first side upper mold end and the inner side of the second side upper mold end to form an automatic limiting mechanism, so that the automatic limiting mechanism can automatically achieve lateral mechanical limitation of the inner mold as the first side upper mold and the second side upper mold are rotated and opened, thereby ultimately achieving mechanical fixation of the inner mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0032] Figure 1 It is a cross-sectional schematic diagram of a closed inner mold in an embodiment of the utility model;

[0033] Figure 2 It is a partial structural axonometric diagram of the locking mechanism in the embodiment of the utility model;

[0034] Figure 3 It is a partial structural schematic diagram of the automatic limit mechanism in the embodiment of the utility model;

[0035] Figure 4 This is a schematic diagram of the motion trajectory of the automatic limiting mechanism in the embodiment of the utility model;

[0036] Figure 5 This is a schematic diagram of another implementation of the automatic limit mechanism in the embodiment of the utility model;

[0037] Figure 6 This is a schematic diagram of the installation structure of the anti-floating mechanism in the embodiment of the utility model;

[0038] Figure 7 It is a schematic cross-sectional view of the installation structure of the telescopic component and the trajectory control mechanism in the embodiment of the utility model.

[0039] Figure numbers: 1-first side lower mold, 2-second side lower mold, 3-first side upper mold, 4-second side upper mold, 401-slot, 5-fixing part, 501-opening, 6-clamping part, 601-swing bolt, 602-locking nut, 7-ear plate, 8-pin shaft, 9-clamp, 901-protrusion, 10-fixing block, 11-pull rod, 12-brace, 13-first oil cylinder, 14-second oil cylinder, 15-driving oil cylinder, 16-connecting rod, 17-first articulated seat, 18-second articulated seat, 19-first connecting seat, 20-second connecting seat, 21-connecting structure.

[0040] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] like Figures 1 to 7The figure shows a closed inner mold (hereinafter referred to as "inner mold") disclosed in the original embodiment, which mainly includes a first inner mold and a second inner mold, and the two ends of the first inner mold are respectively abutted with the two ends of the second inner mold through inclined surfaces to form a closed box beam inner cavity structure, and the two ends of the first inner mold are both located on the inner side of the second inner mold. Among them, the first inner mold includes a first side upper mold 3 and a first side lower mold 1 whose ends are hinged to each other, and the second inner mold includes a second side upper mold 4 and a second side lower mold 2 whose ends are hinged to each other, and the first side lower mold 1 and the second side lower mold 2 are connected as a whole through a trajectory control mechanism, and the first side lower mold 1 and the second side lower mold 2 can be rotated along a set trajectory to close or open under the drive of the trajectory control mechanism.

[0047] refer to Figure 1 , Figure 2 The inner mold also includes a locking mechanism capable of fixing the first side lower mold 1 and the second side lower mold 2. Specifically, the locking mechanism includes a fixing portion 5 and a clamping portion 6. The fixing portion 5 is rigidly connected to the inner wall of the bottom of the first side lower mold 1 by welding, bolt connection, etc. The first end of the clamping portion 6 is rotatably connected to the second side lower mold 2, and the second end of the clamping portion 6 is detachably clamped on the fixing portion 5. Among them, the fixing portion 5 and the clamping portion 6 form a locking mechanism between the first side lower mold 1 and the second side lower mold 2. In the actual construction process, after entering the inner mold, the construction personnel only need to rotate the clamping portion 6 to connect and fix it with the fixing portion 5 to achieve the connection and fixation of the first side lower mold 1 and the second side lower mold 2. Before demoulding, they only need to rotate the clamping portion 6 to separate it from the fixing portion 5. The operation is simple, reducing the workload during the installation and disassembly of the inner mold cavity, which can greatly improve the construction efficiency and reduce the labor intensity of the construction personnel.

[0048] As a preferred embodiment, the fixing portion 5 is a block-shaped structure or a plate-shaped structure as a whole, and its first end is fixedly connected to the inner wall of the first side lower mold 1, and the second end has an opening 501. The clamping portion 6 includes a swing bolt 601 and a locking nut 602, the hinged end of the swing bolt 601 is rotatably connected to the second side lower mold 2, the middle position of the screw rod of the swing bolt 601 is clamped into the opening 501, and the locking nut 602 is threadedly connected to the screw rod of the swing bolt 601, and the locking nut 602 abuts against the top of the fixing portion 5, so that the swing bolt 601 and the fixing portion 5 are locked. The clamping part is formed by the movable bolt 601 and the locking nut 602, which can not only ensure the clamping strength of the clamping part 6 on the fixed part 5, but also can separate the clamping part 6 from the fixed part 5 by slightly rotating the locking nut 602 during dismantling, which is easy to operate. At the same time, the threaded connection between the movable bolt 601 and the locking nut 602 can also realize the downward movement of the bottom end of the first side lower mold 1, thereby eliminating the misalignment between the first side lower mold 1 and the second side lower mold 2, thereby improving the structural strength after the inner mold is unfolded, and ensuring the forming quality of the box girder.

[0049] In the specific implementation process, a lug plate 7 is provided on the inner wall of the bottom of the second side lower mold 2, and the lug plate 7 has a first pin hole, and the hinged end of the swing bolt 601 has a second pin hole, and the first pin hole is coaxial with the second pin hole, and the hinged end of the swing bolt 601 is rotatably connected to the lug plate 7 through the pin 8. Preferably, there are two lug plates 7, and the two lug plates 7 are parallel, and the nut end of the swing bolt 601 is located between the two lug plates 7, so as to improve the stability of the rotational connection between the swing bolt 601 and the second side lower mold 2.

[0050] As a preferred embodiment, the inner mold is also provided with an automatic limiting mechanism to achieve lateral mechanical limiting of the inner mold. Specifically, the automatic limiting mechanism includes a clamping member 9 fixed to the inner side of the end of the first side upper mold 3 and a clamping groove 401 fixed to the inner side of the end of the second side upper mold 4. When the first side upper mold 3 and the second side upper mold 4 are rotated to open, the clamping member 9 is automatically clamped into the clamping groove 401, thereby preventing the upper molds on both sides from opening lateral, and achieving lateral mechanical limiting of the inner mold.

[0051] refer to Figure 3 A protrusion 901 is provided on the clamping member 9, and the protrusion 901 is a trapezoidal structure with a small upper part and a large lower part. The slot width of the clamping slot 401 is greater than the width of the protrusion 901 to avoid movement interference during the rotation and opening of the first side upper mold 3 and the second side upper mold 4, wherein the width direction of the clamping slot 401 and the protrusion 901 is the same as the width direction of the inner mold. When the first side upper mold 3 rotates around the hinge point between the first side upper mold 3 and the first side lower mold 1, the clamping member 9 also rotates with the first side upper mold 3, so that the protrusion 901 is gradually embedded in the slot 401. When the protrusion 901 begins to enter the slot 401, the top of the protrusion 901 is located in the middle area of ​​the slot 401. As the protrusion 901 is gradually embedded in the slot 401, the protrusion 901 gradually moves toward one end of the slot 401, until finally the side of the protrusion 901 facing the first side upper mold 3 is in contact with the slot wall of the slot 401, and there is a gap between the side of the protrusion 901 facing the first side lower mold 1 and the slot wall of the slot 401, that is, Figure 4 As shown. The side of the protrusion 901 facing the first side upper mold 3 is in contact with the groove wall of the clamping groove 401, which can effectively prevent the first side upper mold 3 and the second side upper mold 4 from deviating outward during the concrete pouring process. The side of the protrusion 901 facing the first side lower mold 1 and the groove wall of the clamping groove 401 have a gap, which can effectively prevent the protrusion 901 from interfering with the groove wall of the groove when moving. Preferably, there are multiple automatic limit mechanisms, and each automatic limit mechanism is distributed at intervals along the longitudinal direction of the inner mold.

[0052] It is worth noting that in a specific application process, the automatic limit mechanism is not limited to the above-mentioned clamping member 9 and the clamping slot 401, and other implementations may also be adopted. Figure 5As shown, the automatic limit mechanism can be configured to include a first connection seat 19 fixed to the inner side of the end of the first side upper mold 3 and a second connection seat 20 fixed to the inner side of the end of the second side upper mold 4. When the first side upper mold 3 and the second side upper mold 4 are rotated to open, the first connection seat 19 and the second connection seat 20 are detachably connected through a connection structure 21. The connection structure can be a pin, a bolt or a buckle.

[0053] refer to Figure 6 The inner mold also includes an anti-floating mechanism, which includes a fixed block 10 and a tie rod 11; the fixed block 10 is rigidly connected to the inner wall of the first side lower mold 1 by welding or bolting, the first end of the tie rod 11 is fixedly connected to the fixed block 10 by bolts, and the second end of the tie rod 11 passes through the bottom of the second side lower mold 2 and is connected to the bottom mold of the small box beam. In the specific implementation process, the fixed block 10 and the fixing part 5 can be set to be connected, or the fixed block 10 and the fixing part 5 can be integrally formed, or the fixed block 10 and the fixing part 5 can be separated and spaced.

[0054] refer to Figure 1 The inner mold also includes a diagonal brace 12, one end of which is connected to the inner wall of the first side upper mold 3, and the other end is connected to the inner wall of the second side lower mold 4. By providing the diagonal brace 12, the vertical support limit and the lateral support limit of the inner mold can be achieved at the same time, thereby improving the structural stability of the inner mold after opening. In the specific implementation process, the diagonal brace 12 can be an oil cylinder, a screw rod or a conventional strut, etc. When the diagonal brace 12 is an oil cylinder, its two ends are hinged to the inner walls of the first side upper mold 3 and the second side lower mold 4; when the diagonal brace 12 is a screw rod or a strut, its two ends are connected to the inner walls of the first side upper mold 3 and the second side lower mold 4 by bolts.

[0055] In this embodiment, the first upper mold 3 and the second upper mold 4 can also rotate along the set trajectory on the first lower mold 1 and the second lower mold 2 to close or open under the drive of the telescopic assembly. Figure 7 The telescopic component includes a first oil cylinder 13 and a second oil cylinder 14. One end of the first oil cylinder 13 is hinged to the inner wall of the top of the first side upper mold 3, and the other end is hinged to the inner wall of the first side lower mold 1; one end of the second oil cylinder 14 is hinged to the inner wall of the top of the second side upper mold 4, and the other end is hinged to the inner wall of the second side lower mold 2. Through the telescopic movement of the first oil cylinder 13 and the second oil cylinder 14, the first side upper mold 3 and the second side upper mold 4 can also be expanded or closed.

[0056] It is worth noting that in the specific implementation process, the telescopic assembly is not limited to the first oil cylinder 13 and the second oil cylinder 14 shown in the figure. Considering the long longitudinal length of the inner mold, in order to ensure the synchronization of the opening and closing of the inner mold, a plurality of connecting rod groups can be arranged along the longitudinal direction of the inner mold between the first side upper mold 3 and the first side lower mold 1. Each connecting rod group includes a first connecting rod and a second connecting rod whose ends are hinged to each other, and the other end of the first connecting rod is hinged to the inner wall of the top of the first side upper mold 3, and the other end of the second connecting rod is hinged to the inner wall of the first side lower mold 1. Then, the same position of each connecting rod group is hinged through the pull-out beam, and the first side upper mold 3 is contracted and opened by pushing the pull-out beam longitudinally through the oil cylinder. The same structural design can be used between the first side upper mold 4 and the first side lower mold 2, and it will not be repeated in this embodiment.

[0057] refer to Figure 7 The trajectory control mechanism includes a driving cylinder 15, a connecting rod 16, a first hinge seat 17 installed on the first side lower mold 1, and a second hinge seat 18 installed on the second side lower mold 2. The first hinge seat 17 and the second hinge seat 18 are both double-hole hinge seats. The first hinge seat 17, the second hinge seat 18 and the two connecting rods 16 are hinged to each other to form a four-bar mechanism, so as to realize the first side lower mold 1 and the second side lower mold 2 to close or open according to the trajectory set by the four-bar mechanism. The two ends of the driving cylinder 15 are respectively hinged to the inner wall of the first side lower mold 1 and the inner wall of the second side lower mold 2, so as to drive the first side lower mold 1 and the second side lower mold 2 to close or open according to the trajectory set by the four-bar mechanism. Among them, the first hinge seat 17, the second hinge seat 18 and the two connecting rods 16 can also be connected by a sliding groove to form a four-bar mechanism.

[0058] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A closed inner mold, comprising a first side lower mold (1) and a second side lower mold (2), wherein the first side lower mold (1) can be closed or unfolded along a set trajectory on the second side lower mold (2), characterized in that: It also includes a locking mechanism capable of fixing the first side lower mold (1) and the second side lower mold (2); The locking mechanism comprises a fixing portion (5) and a clamping portion (6); the fixing portion (5) is rigidly connected to the first side lower mold (1), and the fixing portion (5) has an opening (501); The clamping portion (6) includes a pivot bolt (601) and a locking nut (602), the hinged end of the pivot bolt (601) is rotatably connected to the second side lower mold (2), the screw rod of the pivot bolt (601) is clamped into the opening (501), the locking nut (602) is threadedly connected to the screw rod of the pivot bolt (601), and the locking nut (602) abuts against the top of the fixing portion (5).

2. The closed inner mold according to claim 1, characterized in that: It also comprises a first side upper mold (3), a second side upper mold (4) and a diagonal support member (12), wherein the first end of the first side upper mold (3) is hinged to the first side lower mold (1), and the first end of the second side upper mold (4) is hinged to the second side lower mold (2); One end of the diagonal support member (12) is connected to the inner wall of the first upper mold (3), and the other end is connected to the inner wall of the second lower mold (2).

3. The closed inner mold according to claim 2, characterized in that: An automatic limiting mechanism is provided between the second end of the first side upper mold (3) and the second end of the second side upper mold (4) to achieve lateral limiting between the first side upper mold (3) and the second side upper mold (4).

4. The closed inner mold according to claim 3, characterized in that: The automatic limiting mechanism comprises a clamping member (9) fixed to the inner side of the end of the first upper mold (3) and a clamping groove (401) at the end of the second upper mold (4); When the first side upper mold (3) and the second side upper mold (4) are rotated to open, the clamping member (9) is automatically clamped into the clamping slot (401).

5. The closed inner mold according to claim 4, characterized in that: The clamping member (9) is provided with a protrusion (901), and the slot width of the clamping slot (401) is greater than the width of the protrusion (901); When the first side upper mold (3) and the second side upper mold (4) are rotated to open, the protrusion (901) gradually embeds into the slot (401) until the side of the protrusion (901) facing the first side upper mold (3) is in contact with the slot wall of the slot (401), and a gap exists between the side of the protrusion (901) facing the first side lower mold (1) and the slot wall of the slot (401).

6. The closed inner mold according to claim 3, characterized in that: The automatic limiting mechanism comprises a first connecting seat (19) fixed to the inner side of the end of the first upper mold (3) and a second connecting seat (20) fixed to the inner side of the end of the second upper mold (4); When the first side upper mold (3) and the second side upper mold (4) are rotated to open, the first connecting seat (19) and the second connecting seat (20) are detachably connected via a connecting structure.

7. The closed inner mold according to any one of claims 1 to 6, characterized in that: It also includes an anti-floating mechanism, which includes a fixed block (10) and a pull rod (11); The fixing block (10) is rigidly connected to the first side lower mold (1), the first end of the pull rod (11) is connected to the fixing block (10), and the second end of the pull rod (11) passes through the bottom of the second side lower mold (2) and is connected to the external outer mold.

8. The closed inner mold according to claim 7, characterized in that: The fixing block (10) is connected to the fixing portion (5); or The fixing block (10) and the fixing portion (5) are integrally formed; or The fixing block (10) is arranged separately from the fixing portion (5).

9. The closed inner mold according to any one of claims 1 to 6, characterized in that: An ear plate (7) is provided on the inner wall of the bottom of the second side lower mold (2), the ear plate (7) has a first pin shaft hole, and the hinged end of the movable bolt (601) has a second pin shaft hole; The first pin shaft hole is coaxial with the second pin shaft hole, and the nut end of the movable bolt (601) is rotatably connected to the ear plate (7) via a pin shaft (8).

10. The closed inner mold according to claim 9, characterized in that: The number of the ear plates (7) is two, and the hinged end of the articulated bolt (601) is located between the two ear plates (7).

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