Inner mold assembly and prefabricated cavity component forming mold

Abstract

The utility model relates to an inner mold assembly and a prefabricated cavity component forming mold, and belongs to the technical field of assembly type building engineering. The inner die assembly comprises a main shaft; the plurality of adjusting assemblies are arranged on the main shaft; the mold shell comprises a telescopic structure and at least three shell plates, the adjacent shell plates are connected through the telescopic structure, and the shell plates are hinged to the adjusting assembly; when the adjusting assembly moves in the axial direction of the main shaft, the shell plate is close to or away from the main shaft. According to the scheme provided by the utility model, the size of the mold shell can be dynamically adjusted through the adjusting assembly, so that the mold shell can be adaptive to fabricated concrete prefabricated structural members of different specifications, rapid demolding can be realized, and the production speed of prefabricated members can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated building engineering, in particular to an internal mold assembly and a forming mold for prefabricated cavity components. Background Technique

[0002] A prefabricated building refers to transferring a large amount of on-site operation work in the traditional construction method to the factory. Prefabricated building components such as precast columns, precast column floors, precast column beams, precast flues, and precast cement pipes are processed and manufactured in the factory. After the components are manufactured, they are transported to the construction site, and assembled and installed on-site through reliable connection methods. Prefabricated buildings mainly include precast concrete structures, steel structures, modern wood structure buildings, etc. Because of adopting standardized design, factory production, assembly construction, information management, and intelligent application, they are representatives of modern industrial production methods.

[0003] In the prior art, the forming molds used for prefabricated components are generally made of ultra-high performance concrete (UHPC, Ultra-High Performance Concrete) materials, which have the technical advantages of light hoisting and transportation weight, high structural integrity, fast and convenient construction, and no formwork required for installation. However, the current method of manufacturing prefabricated components is to make the four sides of concrete in four times in sequence, with low construction efficiency, and it is difficult to achieve effective sealing between different sides, resulting in leakage problems during concrete pouring. Summary of the Utility Model

[0004] To overcome the problems existing in the related art, the utility model provides an internal mold assembly, which can dynamically adjust the size of the mold shell through the adjusting assembly, so that the mold shell can be adapted to prefabricated concrete structural components of different specifications, and can achieve rapid demoulding, which can greatly improve the production speed of prefabricated components.

[0005] The first aspect of the utility model provides an internal mold assembly, including:

[0006] A main shaft;

[0007] A plurality of adjusting assemblies arranged on the main shaft;

[0008] A mold shell, including a telescopic structure and at least three shell plates, adjacent shell plates are connected by the telescopic structure, and the shell plates are hinged to the adjusting assemblies;

[0009] Wherein, when the adjusting assembly moves along the axial direction of the main shaft, the shell plate approaches or moves away from the main shaft.

[0010] In a possible implementation of the above first aspect, the main shaft includes a lead screw;

[0011] The adjusting assembly includes a ball nut and at least three adjusting rods. The ball nut is sleeved on the lead screw, the first end of the adjusting rod is hinged to the ball nut, and the second end is hinged to the shell plate.

[0012] In a possible implementation of the first aspect above, the ball nuts are equidistantly distributed on the lead screw.

[0013] In a possible implementation of the first aspect above, the lead screw is further connected with a rotating handle.

[0014] In a possible implementation of the first aspect above, the shell plate includes a first plate body, a second plate body and a third plate body connected in sequence. A chamfer structure is formed between the first plate body, the second plate body and the third plate body, and the adjusting rod is hinged to the second plate body.

[0015] In a possible implementation of the first aspect above, the included angle between the second plate body and the first plate body is equal to the included angle between the second plate body and the third plate body, and the angle of the included angle is 120°-180°.

[0016] In a possible implementation of the first aspect above, the telescopic structure includes an elastic layer, a fixed seat, a sliding seat and a connecting rod;

[0017] Adjacent shell plates are connected by the elastic layer, and the elastic layer is located on the outer side wall of the shell plate;

[0018] The first end of the connecting rod is connected to the fixed seat, the second end passes through the shaft hole of the sliding seat. The fixed seat is arranged on the first side of the inner side wall of the shell plate, the sliding seat is arranged on the second side of the inner side wall of the shell plate, the axial direction of the connecting rod is parallel to the radial direction of the main shaft, and adjacent shell plates can move relative to the axial direction of the connecting rod.

[0019] In a possible implementation of the first aspect above, a stepped groove is formed on the outer side wall of the shell plate, the elastic layer is accommodated in the stepped groove, and the end face of the elastic layer is flush with the outer end face of the shell plate.

[0020] In a possible implementation of the first aspect above, the connecting rod is made of steel, and the elastic layer is made of rubber.

[0021] The second aspect of the present utility model provides a prefabricated cavity member forming mold, including the inner mold assembly of any one of the above.

[0022] The technical solutions provided by the present utility model may include the following beneficial effects:

[0023] The inner mold assembly provided by the present utility model includes a main shaft, a plurality of adjusting components, and a membrane shell. Among them, the shell plates in the mold shell are connected through a telescopic structure. When the adjusting components move on the main shaft, the shell plates move relative to the adjusting components, causing adjacent shell plates to approach or move away from each other, thereby changing the size of the mold shell. During use, the user can, according to the requirements of the design drawing, move the adjusting components along the axial direction of the main shaft to change the distance between the shell plates and the main shaft, so as to obtain a mold shell with a suitable specification size. And after the UHPC precast cavity component is poured, rapid demolding can be achieved through the adjusting components, which has the characteristics of simple structure, convenience and speed. Description of the Drawings

[0024] By describing the exemplary embodiments of the present utility model in more detail in conjunction with the drawings, the above-mentioned and other objects, features, and advantages of the present utility model will become more obvious. Among them, in the exemplary embodiments of the present utility model, the same reference numerals generally represent the same components.

[0025] Figure 1 is a schematic structural diagram of the inner mold assembly shown in the embodiment of the present utility model;

[0026] Figure 2 is another schematic structural diagram of the inner mold assembly shown in the embodiment of the present utility model;

[0027] Figure 3 is Figure 2 an enlarged schematic view of part A in

[0028] Figure 4 is Figure 2 an enlarged schematic view of part B in

[0029] Figure 5 is a schematic diagram of the cooperation between the inner mold assembly and the mold table shown in the embodiment of the present utility model;

[0030] Figure 6 is a schematic structural diagram of the precast cavity component forming mold shown in the embodiment of the present utility model;

[0031] Figure 7 is a state diagram of pouring UHPC shown in the embodiment of the present utility model;

[0032] Figure 8 is a schematic diagram of the cooperation between the precast component and the inner mold assembly shown in the embodiment of the present utility model;

[0033] Figure 9 is a cross-sectional view of the inner mold assembly shown in the embodiment of the present utility model;

[0034] Figure 10 is a change state diagram of the inner mold assembly shown in the embodiment of the present utility model.

[0035] Reference numerals:

[0036] 1. Main shaft; 11. Rotating handle;

[0037] 2. Adjusting assembly; 21. Ball nut; 22. Adjusting rod;

[0038] 3. Mould shell; 31. Telescopic structure; 311. Elastic layer; 312. Fixed seat; 313. Sliding seat; 314. Connecting rod; 32. Shell plate; 321. First plate body; 322. Second plate body; 323. Third plate body;

[0039] 4. Outer mould assembly; 41. Mould table; 42. Side template; 43. Calibration pull rod; 44. Magnet suction cup; 45. Rectangular rubber sleeve;

[0040] 5. Prefabricated component. Detailed implementation manners

[0041] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Existing prefabricated cavity component forming molds need to meet performance requirements such as lightness, sealing and high strength. The traditional method is to use four-sided concrete to make it in four steps. The construction efficiency is low, and it is difficult to achieve effective sealing between different surfaces, resulting in leakage problems during concrete pouring.

[0046] In view of the above problems, the utility model provides an inner mold assembly and a prefabricated cavity component forming mold, which can dynamically adjust the size of the mold shell 3 by adjusting the assembly 2, so that the mold shell 3 can be adapted to prefabricated concrete structural parts of different specifications, and can achieve rapid demoulding, which can greatly improve the production speed of the prefabricated component 5.

[0047] The technical solution of the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0048] See also Figures 1 to 2 , an inner mold assembly provided by an embodiment of the utility model includes a main shaft 1;

[0049] A plurality of adjustment components 2 are arranged on the main shaft 1;

[0050] The formwork 3 comprises a telescopic structure 31 and at least three shell plates 32, wherein adjacent shell plates 32 are connected via the telescopic structure 31, and the shell plates 32 are hinged to the adjustment assembly 2;

[0051] When the adjusting assembly 2 moves along the axial direction of the main shaft 1 , the shell plate 32 moves closer to or farther away from the main shaft 1 .

[0052] The inner mold assembly provided by the utility model can be used to manufacture assembled concrete prefabricated components, such as prefabricated columns, beams, flues or cement pipes and other building structures. The utility model embodiment takes the prefabricated column as an example to explain the utility model embodiment in detail.

[0053] Specifically, the formwork 3 is composed of at least three shell plates 32. Therefore, the formwork 3 has at least three sides and an open cavity, and the main shaft 1 and the adjustment component 2 are located in the open cavity. When the inner mold assembly is applied to the prefabricated concrete column of the assembled building, the formwork 3 can be composed of four shell plates 32 grooves. At this time, the inner mold assembly is as follows Figures 1 to 8 When the inner mold assembly is used, UHPC material is poured on each side, and the cement therein solidifies into a shell membrane of the shell structure after hydration heat.

[0054] Adjust the size of the mold cavity through the main shaft 1 and the adjusting component 2, so that users can produce various precast components 5 according to different construction drawings. Specifically, when the adjusting component 2 moves along the axial direction of the main shaft 1, the spatial structure among the main shaft 1, multiple adjusting components 2, and the shell plate 32 is similar to a regular quadrilateral being converted into a parallelogram, and the adjusting component 2 acts as the hypotenuse of the parallelogram. For details, refer to Figure 9 and Figure 10 . Therefore, the distance between the shell plate 32 and the main shaft 1 can be dynamically adjusted according to the adjusting component 2. The mold shell 3 is composed of at least three shell plates 32 and a telescopic structure 31. When the adjusting component 2 moves along the axial direction of the main shaft 1, the relative positions of the respective shell plates 32 and the main shaft 1 change. For example, when the shell plate 32 moves closer to the main shaft 1, the volume of the mold shell 3 decreases at this time, and the telescopic structure 31 can eliminate this change amount, that is, the telescopic structure 31 expands or contracts according to the position of the shell plate 32. At this time, the relationship between adjacent shell plates 32 is to approach or move away from each other.

[0055] In this embodiment, the adjusting component 2 can be slidably connected to the main shaft 1. When the main shaft 1 rotates, it drives the adjusting component 2 to rotate to realize the movement of the adjusting component 2. The adjusting component 2 can be connected to the main shaft 1. When the main shaft 1 moves along its own axis, it drives the adjusting component 2 to move, thereby driving the shell plate 32 to approach or move away from the main shaft 1.

[0056] In this embodiment, precast components 5 of various specifications can be manufactured by the distance between the shell plate 32 and the main shaft 1. After pouring the precast component 5 with UHPC material, the precast component 5 can be quickly demolded through the main shaft 1 and the adjusting component 2, realizing cyclic green production, and the labor and material costs can be reduced.

[0057] In practical applications, the shape of the precast component 5 is commonly a prism, which can be divided into a triangular prism, a quadrangular prism, a prism with five edges, an ellipsoid, and a cylinder. In order to adapt to the widely used columnar structures, the main shaft 1 of the above-mentioned internal mold component includes a lead screw;

[0058] The adjusting component 2 includes a ball nut 21 and at least three adjusting rods 22. The ball nut 21 is sleeved on the lead screw, and the first end of the adjusting rod 22 is hinged to the ball nut 21, and the second end is hinged to the shell plate 32.

[0059] It should be noted that the ball nut 21 is threadedly connected to the lead screw, and the movement directions of each ball nut 21 and the lead screw can be the same or different. As Figure 10 shown, the moving modes of adjacent ball nuts 21 are opposite, which is only a relatively preferred implementation manner. Therefore, the ball nut 21 of the internal mold component provided by the present invention should not be limited to this situation.

[0060] During specific implementation, the number of adjusting rods 22 is equal to the number of shell plates 32, so that each adjusting rod 22 on a ball nut 21 can be connected to one shell plate 32 to ensure the stability of the shell plate 32. On the one hand, the adjusting rods 22 hinged on the ball nut 21 need to correspond to the shell plates 32, and on the other hand, the adjusting rods 22 are evenly and equidistantly distributed on the ball nut 21, so as to ensure that the shell plate 32 and the adjusting rods 22 can achieve the purpose of moving towards the axis of the main shaft 1, improving the overall structural stability and flatness of the inner mold assembly.

[0061] On the basis of the above specific implementation manner, those skilled in the art can drive the lead screw manually or mechanically according to different occasions. When using the manual method, a rotating handle 11 or a rotating disk can be provided at the end of the lead screw. When using the mechanical method, a hand-held stirrer can be used, and a corresponding connection structure can be provided at the end of the lead screw to quickly adjust the size of the inner mold assembly or perform the demolding work.

[0062] On the basis of the above specific implementation manner, the ball nuts 21 of the inner mold assembly are equidistantly distributed on the lead screw. The equidistant distribution of the ball nuts 21 on the lead screw can ensure that each ball nut 21 has a certain amount of movement and avoid interference between each other. In this embodiment, the distance between each ball nut 21 can be freely set according to the actual situation, and there is no unique limitation here.

[0063] On the basis of the above specific implementation manner, please refer to Figure 4 The shell plate 32 of the inner mold assembly includes a first plate body 321, a second plate body 322 and a third plate body 323 connected in sequence. A chamfer structure is formed between the first plate body 321, the second plate body 322 and the third plate body 323, and the adjusting rod 22 is hinged to the second plate body 322.

[0064] Specifically, the shell plate 32 composed of the first plate body 321, the second plate body 322 and the third plate body 323 can be formed by stamping a metal plate or by welding the first plate body 321, the second plate body 322 and the third plate body 323. In some cases, the shell plate 32 can also be made of plastic material and can be integrally formed by plastic injection molding. The shell plate 32 in the present invention is composed of the first plate body 321, the second plate body 322 and the third plate body 323 and forms a chamfer structure. On the one hand, it can ensure that the second plate body 322 and the adjusting rod 22 have sufficient contact area and ensure the mechanical strength of the hinge point between the adjusting plate and the second plate body 322. On the other hand, it is convenient to increase the contact surface between the corners of the shell plate 32 and the precast member 5 after pouring the UHPC material, so that the force received at the corners of the shell plate 32 is more balanced during the demolding construction.

[0065] Based on the above specific implementation manner, the included angle between the second plate body 322 and the first plate body 321 of the inner mold assembly is equal to the included angle between the second plate body 322 and the third plate body 323, and the angle of the included angle is 120° to 180°.

[0066] The included angle between the first plate body 321 and the second plate body 322 is equal to the included angle between the second plate body 322 and the third plate body 323, which can ensure the mechanical strength of the corners of the shell plate 32. In specific implementation, when the inner mold assembly is a triangular prism, the included angle is 120° at this time. When the inner mold assembly is a regular quadrangular prism, the included angle is 135° at this time; when the inner mold assembly is a regular pentagonal prism, the included angle is 144° at this time; when the inner mold assembly is a regular hexagonal prism, the included angle is 150° at this time. It can be seen that the more sides the prism has, the closer the included angle is to 180°. After the included angle reaches 180°, the inner mold assembly is a cylinder. At this time, the first plate body 321, the second plate body 322, and the third plate body 323 can be regarded as an arc plate body.

[0067] In a specific implementation manner, please refer to Figure 2 and Figure 3 , the telescopic structure 31 of the inner mold assembly includes an elastic layer 311, a fixed seat 312, a sliding seat 313, and a connecting rod 314;

[0068] Adjacent shell plates 32 are connected by the elastic layer 311, and the elastic layer 311 is located on the outer side wall of the shell plate 32;

[0069] The first end of the connecting rod 314 is connected to the fixed seat 312, the second end passes through the shaft hole of the sliding seat 313. The fixed seat 312 is arranged on the first side of the inner side wall of the shell plate 32, the sliding seat 313 is arranged on the second side of the inner side wall of the shell plate 32, the axial direction of the connecting rod 314 is parallel to the radial direction of the main shaft 1, and adjacent shell plates 32 can move relative to the axial direction of the connecting rod 314.

[0070] Adjacent shell plates 32 are connected by the telescopic structure 31. The elastic layer 311 of the telescopic structure 31 is laid as a surface layer on the outer side of the formwork 3, and the fixed seat 312, the sliding seat 313, and the connecting rod 314 are arranged as an inner layer inside the formwork 3. The function of the elastic layer 311 is to keep the outer side of the formwork 3 in a smooth state when the shell plate 32 approaches or moves away from the main shaft 1. When the shell plate 32 moves, the connecting rod 314 slides in the sliding seat 313, so as to ensure the overall structural positioning of the formwork 3 in the telescopic state or the diastolic state and maintain a certain bending strength, and prevent the shell plate 32 from collapsing.

[0071] On the basis of the above specific implementation manner, a stepped groove is formed on the outer side wall of the shell plate 32 of the inner mold assembly, the elastic layer 311 is accommodated in the stepped groove, and the end face of the elastic layer 311 is flush with the outer end face of the shell plate 32. With this setting, the flatness of the outer side of the mold shell 3 can be ensured, thereby improving the quality level of the precast member 5. The elastic layer 311 and the shell plate 32 can be connected by equidistant bolt anchoring.

[0072] On the basis of the above specific implementation manner, the connecting rod 314 of the inner mold assembly is made of steel, and the elastic layer 311 is made of rubber.

[0073] Specifically, the connecting rod 314 is made of steel. During use, grease can be coated on the surface of the connecting rod 314 to reduce the friction between the connecting rod 314 and the sliding seat 313. One end of it is fixed on the fixed seat 312, and the other end is inserted into the shaft hole of the sliding seat 313 to achieve free sliding. During installation, the connecting rods 314 are arranged at equal intervals longitudinally on the inner side wall of the mold shell 3, and fixed seats 312 and sliding seats 313 are provided on both sides of each shell plate 32 to facilitate the connection of adjacent shell plates 32. The cross-sectional shape of the connecting rod 314 can be circular or rectangular.

[0074] Based on the inner mold assembly provided in the above embodiments, the present invention also provides a precast cavity member forming mold. Please refer to Figures 5 to 10 The precast cavity member forming mold includes an outer mold assembly 4 and the inner mold assembly of any one of the above embodiments. Among them, the outer mold assembly 4 includes a mold table 41, side templates 42, calibration tie rods 43, magnet chucks 44, and rectangular rubber sleeves 45;

[0075] The above inner mold assembly is placed on the mold table 41, and there is a certain gap between the mold table 41 and the inner mold assembly, and this gap is the shell layer thickness of the precast member 5;

[0076] The side templates 42 are respectively arranged on both sides of the inner mold assembly and are parallel to the plane of the mold shell 3. The calibration tie rods 43 connect the two side templates 42 and are used to adjust the distance between the two side templates 42;

[0077] The magnet chucks 44 are placed on the mold table 41 and are in contact with the side templates 42;

[0078] The rectangular rubber sleeves 45 are located on the inner side wall of the mold shell 3 and are in contact with the mold table 41.

[0079] To facilitate those skilled in the art to implement the design concept involved in the present invention, the present invention also provides a specific operation process of the precast cavity member forming mold:

[0080] Step 1: As Figure 5As shown, install the inner mold assembly, check whether the inner mold assembly is loose, place the inner mold assembly horizontally on the mold table 41, and reserve a certain prefabricated height. Then, adjust the size of the formwork 3 according to the construction design drawings.

[0081] Step 2: As Figure 6 shown, paste a rectangular rubber sleeve 45 on one side edge of the side formwork 42. Place the ends of the two side formworks 42 with the rectangular rubber sleeves 45 pasted thereon on the mold table 41. During the installation process, ensure that the end face of the side formwork 42 facing the inner mold assembly is parallel to the plane of the formwork 3. Then, install and adjust the tension rod 43, adjust the distance between the side formwork 42 and the formwork 3. After the adjustment is completed, install the magnet suction cup 44 on the mold table 41 to ensure that the magnet suction cup 44 is closely attached to the side formwork 42.

[0082] Step 3: As Figures 7 to 10 shown, pour the UHPC material, use a measuring scale to measure the thickness of the shell layer on the upward side of the formwork 3. After the thickness reaches the preset requirement and the UHPC coagulates, disassemble the outer mold assembly 4, and then hold the rotating handle 11 and rotate the lead screw to drive the shell plate 32 towards the main shaft 1 to complete the demolding work of the inner mold assembly.

[0083] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0084] The above has described the embodiments of the present invention. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application or the improvement of the technology in the market, or to enable other ordinary technical personnel in the technical field to understand the disclosed embodiments.

Claims

1. An inner mold assembly, characterized in that: include: Spindle; A plurality of adjustment components are arranged on the main shaft; The formwork shell comprises a telescopic structure and at least three shell plates, wherein adjacent shell plates are connected via the telescopic structure, and the shell plates are hinged to the adjustment assembly; Wherein, when the adjusting assembly moves along the axial direction of the main shaft, the shell plate approaches or moves away from the main shaft.

2. The inner mold assembly according to claim 1, characterized in that: The main shaft includes a screw rod; The adjusting assembly comprises a ball nut and at least three adjusting rods. The ball nut is sleeved on the screw rod. The first end of the adjusting rod is hinged to the ball nut, and the second end is hinged to the shell plate.

3. The inner mold assembly according to claim 2, characterized in that: The ball nuts are evenly distributed on the screw rod.

4. The inner mold assembly according to claim 3, characterized in that: The screw rod is also connected with a rotating handle.

5. The inner mold assembly according to claim 2, characterized in that: The shell plate includes a first plate body, a second plate body and a third plate body which are connected in sequence, a chamfered structure is formed between the first plate body, the second plate body and the third plate body, and the adjusting rod is hinged to the second plate body.

6. The inner mold assembly according to claim 5, characterized in that The included angle between the second plate body and the first plate body is equal to the included angle between the second plate body and the third plate body, and the angle is 120° to 180°.

7. The inner mold assembly according to claim 1, characterized in that The telescopic structure comprises an elastic layer, a fixed seat, a sliding seat and a connecting rod; The adjacent shell plates are connected by the elastic layer, and the elastic layer is located on the outer side wall of the shell plate; The first end of the connecting rod is connected to the fixed seat, and the second end is penetrated by the axial hole of the sliding seat. The fixed seat is arranged on the first side of the inner wall of the shell plate, and the sliding seat is arranged on the second side of the inner wall of the shell plate. The axial direction of the connecting rod is parallel to the radial direction of the main shaft, and the adjacent shell plates can move axially relative to the connecting rod.

8. The inner mold assembly according to claim 7, characterized in that: A stepped groove is provided on the outer side wall of the shell plate, the elastic layer is accommodated in the stepped groove, and the end surface of the elastic layer is flush with the outer side end surface of the shell plate.

9. The inner mold assembly according to claim 8, characterized in that The connecting rod is made of steel, and the elastic layer is made of rubber.

10. A prefabricated cavity component forming mold, characterized in that: The invention comprises an inner mold assembly as claimed in any one of claims 1 to 9.

Images