CN218748441U - Internal mold expansion and contraction control structure for hollow prefabricated part production, core mold and mold - Google Patents

Abstract

The utility model provides an interior mould breathing control structure is used in hollow prefabricated component production, encircle the movable support plate of core bar including a core bar and more than two circumference. The core rod may reciprocate in a length direction of the hollow preform. The movable supporting plate is connected to the core rod through a plurality of hinge assemblies arranged at intervals, and the hinge assemblies are respectively in rotating connection with the core rod and the movable supporting plate. At least a part of the hinge assemblies mounted on the same movable support plate are sliding hinge assemblies, and at least one of the movable support plate and the core bar can slide relative to the sliding hinge assemblies along the length direction of the hollow prefabricated component for a preset length. The effect of this scheme is, the drawing of patterns is folded earlier to the movable support plate of the articulated subassembly department that the nonslip set up, and the drawing of patterns behind the movable support plate that slip articulated subassembly connects realizes the effect of local difference drawing of patterns, has effectively reduced the required external force of exerting of the drawing of patterns. The utility model also provides a mandrel and mould including above-mentioned structure.

Description

Internal mold expansion and contraction control structure for hollow prefabricated part production, core mold and mold

Technical Field

The utility model relates to a prefabricated component production facility field, concretely relates to hollow prefabricated component production is with centre form breathing control structure, core mould and a mould.

Background

In the production process, in order to produce a prefabricated part with a hollow structure, a common method is to place a core mould in a mould of the prefabricated part, then pour cement, and finally pull out the core mould, so as to form a cavity in the produced prefabricated part.

The traditional core mold has a simple structure, for example, an iron sheet can be directly rolled into a proper shape, and then a layer of protective pad is coated on the outer surface of the iron sheet. Such a core mold is completely attached to the preform after the preform is molded, and thus a driving force required when the core mold is drawn is considerably large.

In view of this, the prior art provides a deformable core that is characterized by expansion or contraction. Controlling core mold expansion during use; when the core mould needs to be drawn out, the core mould is firstly controlled to deform and shrink, and then the core mould is drawn out after the outer wall of the core mould is separated from the inner wall of the prefabricated part. This prior art has the advantage that excessive friction does not need to be overcome during withdrawal of the core.

However, since the outer wall of the core mold is approximately vacuum with the prefabricated member after the core mold is attached, the air pressure needs to be overcome during demolding, and since the core mold is generally long, the resultant force of the air pressure needed to be overcome during demolding is large, the driving force needed for controlling the deformable core mold to be separated from the prefabricated member is also large, and the problem of difficult demolding still exists.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the driving force required to control the release of the existing deformable core mold is too large, resulting in very difficult release.

In order to solve the technical problem, the utility model provides a technical scheme as follows:

the utility model provides an interior mould breathing control structure is used in hollow prefabricated component production, include: the device comprises a core bar and more than two movable supporting plates which circumferentially surround the core bar;

wherein the core bar can reciprocate along the length direction of the hollow prefabricated part; the movable supporting plate extends along the length direction of the hollow prefabricated part and is connected to the core rod through a plurality of hinge assemblies arranged at intervals, and the hinge assemblies are respectively in rotary connection with the core rod and the movable supporting plate;

at least a part of the hinge assemblies mounted on the same movable support plate are sliding hinge assemblies, and at least one of the movable support plate and the core bar can slide relative to the sliding hinge assemblies along the length direction of the hollow prefabricated part for a preset length.

In a preferred embodiment, the slidable distance of each sliding hinge assembly increases in sequence from one end of the core rod to the other end of the core rod.

In a further preferred scheme, the hinge assembly comprises a hinge rod, and two ends of the hinge rod are respectively rotatably connected with the movable support plate and the core rod; for the sliding hinge assembly, at least one of the movable support plate and the core bar is provided with a waist-shaped hinge hole which extends for a preset length along the length direction of the core bar, and the hinge rod is connected with the waist-shaped hinge hole in a sliding manner; or, for the sliding hinge assembly, at least one of the movable support plate and the core bar is provided with a guide rail extending for a preset length along the length direction of the core bar, and the hinge bar is connected with the guide rail in a sliding way.

In a further preferred scheme, torsion springs are arranged between the hinge rod and the core rod and/or between the hinge rod and the movable support plate.

In a preferred scheme, a plurality of mounting holes are formed in the movable supporting plate at intervals along the length direction, and a detachable cover body is arranged on the mounting holes of the movable supporting plate; and/or a plurality of reinforcing rib plates are arranged on one side of the movable supporting plate facing the core rod at intervals.

In a preferable scheme, the hollow prefabricated member further comprises a driving rotating shaft in threaded connection with one end part of the core rod in the length direction, and the driving rotating shaft is used for being externally connected with a driving device and driving the core rod to reciprocate along the length direction of the hollow prefabricated member.

In a further preferred scheme, the movable supporting plate is provided with a connecting seat, the connecting seat is provided with a through hole for the driving rotating shaft or the core rod to penetrate through, and the through hole is a radial waist-shaped hole.

In a further preferred scheme, the driving rotating shaft is rotatably connected with the connecting seat through a bearing; the outer surface of the driving rotating shaft is provided with a limiting bulge, and the limiting bulge is abutted between the bearing and the connecting seat; and/or one end part of the core rod, which is back to the driving rotating shaft in the length direction, is connected with a supporting rod, and the connecting seat is sleeved outside the supporting rod.

The working principle of the scheme is that when the core bar moves along the length direction, the hinge assembly directly receives the pulling force or the pushing force of the core bar to rotate and pulls the movable supporting plate connected with the hinge assembly to fold; the sliding hinge assembly moves for a preset length relative to the core rod, and then the sliding hinge assembly receives enough pulling force or pushing force provided by the core rod, so that the sliding hinge assembly starts to rotate and pulls the movable supporting plate connected with the sliding hinge assembly. Because the resultant force required to be overcome during local demolding is certainly smaller than the resultant force required to be overcome during integral simultaneous demolding, the core mold can be driven to be demolded by only providing a smaller driving force, and the effect of saving more labor is achieved.

Therefore, the problem that the driving force required by the core mold in the prior art is too large during demolding is solved, demolding is more labor-saving, and the core mold is more convenient to demold.

The utility model also provides a mandrel, including the hollow prefabricated component production inner mold expansion and contraction control structure as above, wherein the movable support plate is an elastic hard mold surrounding the core rod; or, the hollow prefabricated component production internal mold expansion and contraction control structure comprises the hollow prefabricated component production internal mold expansion and contraction control structure and the elastic mold sleeve, wherein the elastic mold sleeve is sleeved outside the movable supporting plate.

The utility model provides a mandrel contains foretell hollow prefabricated component production with centre form breathing control structure, hollow prefabricated component production is with centre form breathing control structure can order about movable support plate synchronous motion, because movable support plate is the elasticity die, perhaps has sleeved the elasticity mantle outside movable support plate, therefore elasticity dura mater and elasticity mantle homoenergetic warp, has the advantage of reinforcing suitability and the drawing of patterns of being convenient for.

The utility model also provides a mould, including the external mold with as above the mandrel, the mandrel install in the die cavity of external mold.

The utility model provides a mould contains aforementioned mandrel, therefore has the function the same with the mandrel, has the advantage of being convenient for produce hollow prefabricated component.

Drawings

FIG. 1 is a schematic structural view of a core rod in a first preferred embodiment of an internal mold expansion and contraction control structure for producing a hollow prefabricated part;

FIG. 2 is a schematic view showing one kidney-shaped hinge hole in a first preferred embodiment of an inner mold expansion and contraction control structure for hollow prefabricated part production;

fig. 3 is a schematic structural view of an expansion and contraction control structure of an inner mold for producing a hollow prefabricated part, in which a core rod is connected with a hinge assembly and a driving rotating shaft according to a preferred embodiment;

fig. 4 is a schematic perspective view of a core bar, a hinge assembly and a driving shaft after being connected with the hinge assembly and the driving shaft in a preferred embodiment of an internal mold expansion and contraction control structure for producing a hollow prefabricated component;

FIG. 5 is a schematic structural diagram of a joint between a hinge assembly and a core rod in a second preferred embodiment of an internal mold expansion and contraction control structure for producing a hollow prefabricated component;

FIG. 6 is a schematic view showing the connection relationship between the hinge assembly and the core rod in the second preferred embodiment of the inner mold expansion and contraction control structure for hollow prefabricated part production;

FIG. 7 is a schematic structural view showing a state where the hinge assembly is connected to the movable support plate and the core bar, respectively;

figure 8 is a schematic view of a preferred embodiment of the mandrel;

figure 9 shows a schematic view of another preferred embodiment of the mandrel;

figure 10 shows a half sectional view of a preferred embodiment of the mandrel;

FIG. 11 is a schematic view showing the shape and structure of the core mold after hiding the elastic mold sleeve;

FIG. 12 is a schematic view of the inside of the movable support plate;

fig. 13 is a schematic structural view of a portion a in fig. 10;

FIG. 14 is a schematic view showing the connection between the bearing, the bearing mounting plate and the driving shaft;

FIG. 15 is a schematic view of a bearing and a bearing mount;

FIG. 16 is a schematic view showing a connection relationship between the connecting base and the driving shaft;

description of reference numerals: 1. a core bar; 101. a connecting plate; 102. a waist-shaped hinge hole; 103. a guide rail; 104. a sliding connection portion; 11. a reinforcing rib plate; 2. a hinge assembly; 21. a hinged lever; 22. a connecting pin; 23. a torsion spring; 31. driving the rotating shaft; 32. a support bar; 311. an external thread; 312. a threaded hole; 313. a limiting bulge; 41. a connecting seat; 410. a radial waist-shaped hole; 411. a bearing mounting plate; 42. a bearing mount; 420. a blocking cavity; 421. a bearing; 422. a bearing avoidance position; 5. a movable support plate; 6. elastic hard mold; 61. an elastic die sleeve; 71. a cover body;

l, a predetermined length.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, integrally connected, or detachably connected; may be communication within two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art can understand the specific meaning of the above terms in the present invention in specific situations.

The structure of the preferred embodiment of the expansion and contraction control structure of the inner mold for producing the hollow prefabricated parts will be described with reference to the accompanying drawings.

The first embodiment is as follows:

as shown in fig. 3, 4 and 11, the present embodiment provides an expansion and contraction control structure of an inner mold for producing a hollow prefabricated part, which includes a core rod 1 and more than two movable support plates 5 circumferentially surrounding the core rod 1. The core bar 1 can reciprocate along the length direction of the hollow prefabricated part under the driving of external power; the movable supporting plate 5 extends along the length direction of the hollow prefabricated part, the movable supporting plate 5 is connected with the core rod 1 through the plurality of hinge assemblies 2, the hinge assemblies 2 are hinged with the movable supporting plate 5 and the core rod 1, and the hinge assemblies 2 can rotate relative to the core rod 1 and the movable supporting plate 5 to achieve the function of driving the movable supporting plate 5 to be folded or stretched. At least part of the hinge assemblies 2 arranged on the same movable support plate 5 are sliding hinge assemblies, the sliding hinge assemblies can slide along the length direction of the hollow prefabricated part relative to at least one of the movable support plate 5 and the core bar 1, so that when the core bar 1 moves along the length direction, the core bar 1 firstly moves for a preset length relative to the sliding hinge assemblies, and the sliding hinge assemblies are driven to be connected with the movable support plate 5 to move until the core bar 1 pushes or pulls the sliding hinge assemblies.

Specifically, as shown in fig. 1 and 2, for the sliding hinge assembly, during the process that the core bar 1 moves along the length direction by the predetermined length L, the core bar 1 moves relative to the sliding hinge assembly by the predetermined length L, and during the process, the core bar 1 does not apply a pulling force or a pushing force to the sliding hinge assembly enough to drive the sliding hinge assembly to rotate, so that the sliding hinge assembly is not rotated and folded temporarily; after the core bar 1 moves for the preset length L, the core bar 1 can contact and push the sliding hinge assembly, so that the sliding hinge assembly is rotated under the action force enough to drive the sliding hinge assembly to rotate, and folding or stretching is realized. Namely, the movable supporting plate 5 at the hinge assembly 2 which can not slide is firstly stressed to demould, and the movable supporting plate 5 at the slide hinge assembly is arranged and then stressed to demould, so that the demoulding of different sections of the core mould is in sequence. The total force required to be overcome by demoulding the partial section is certainly less than the total force required to be overcome by demoulding the whole body at the same time, so that the core mould can be driven to be demoulded by only providing a smaller driving force, and the effect of saving more labor is achieved.

Preferably, a plurality of connecting plates 101 are arranged on the outer surface of the core bar 1, the connecting plates 101 extend outwards along the radial direction of the core bar 1, and the connecting plates 101 are convenient for connecting the hinge assembly 2. Of course, it is also possible to arrange the hinge member 2 directly on the core rod 1.

Preferably, as shown in fig. 7, the hinge assembly 2 includes a hinge rod 21, and both ends of the hinge rod 21 are respectively hinged to the movable support plate 5 and the core bar 1. The hinge rod 21 can be hinged with the movable support plate 5 and the core bar 1 through a connecting pin 22, and other common hinge structures can be adopted for hinging. And torsion springs 23 are further arranged between the two ends of the hinge rod 21 and the core rod 1 and between the two ends of the hinge rod and the movable supporting plate 5, so that the hinge rod 21 is limited in rotation, and the function of preventing the hinge rod 21 from rotating reversely is achieved.

Preferably, for the sliding hinge assembly, a waist-shaped hinge hole 102 is formed on the core bar 1 or the connecting plate 101, the hinge assembly 2 is rotatably movably connected in the waist-shaped hinge hole 102, and the hinge assembly 2 is movable relative to the core bar 1 in the waist-shaped hinge hole 102. The inner walls of the left and right sides of the waist-shaped hinge hole 102 can push or pull the hinge assembly 2.

In detail, the waist-shaped hinge hole 102 extends a predetermined length L along the length direction of the core bar 1, and the lower end of the sliding hinge assembly is movably connected in the waist-shaped hinge hole 102. When the core bar 1 moves to the right, the position of the sliding hinge assembly relative to the waist-shaped hinge hole 102 moves to the left, and the friction force of the inner wall of the waist-shaped hinge hole 102 relative to the sliding hinge assembly is not enough to pull or push the sliding hinge assembly during the movement of the core bar 1, so that the sliding hinge assembly cannot rotate and fold. After the core bar 1 moves for the preset length L, the inner wall of the left side of the waist-shaped hinge hole 102 pushes against the sliding hinge assembly, so that the sliding hinge assembly moves rightwards along with the core bar 1, and the sliding hinge assembly rotates under the action of resultant force to be folded.

Of course, waist-shaped hinge hole 102 may be disposed at an angle inclined with respect to the length direction of core rod 1. In this state, it should be noted that waist-shaped hinge hole 102 has a size and shape such that the inner wall of waist-shaped hinge hole 102 does not exert a strong force on hinge assembly 2 enough to rotate hinge assembly 2 during the predetermined length L of movement of core rod 1.

Preferably, as shown in fig. 12, a plurality of reinforcing ribs 11 are further provided at intervals on the inner surface of the movable supporting plate 5, and the reinforcing ribs 11 extend along the length direction of the movable supporting plate 5 to enhance the strength of the movable supporting plate 5 and prevent the movable supporting plate 5 from bending downward under the pressure of the concrete slurry. The reinforcing rib plate 11 is arranged between two adjacent hinge assemblies 2 in the same row, so that the movable supporting plate 5 can be bent by a small angle around the installation position of the hinge assemblies 2, and the requirement of asynchronous demoulding is met.

Preferably, as shown in fig. 11 and 12, the movable supporting plate 5 is further provided with a plurality of mounting holes, and the mounting holes are provided with detachable covers 71. The mounting holes are preferably correspondingly arranged at positions close to the hinge assemblies 2, so that the movable supporting plates 5 and the hinge assemblies 2 can be conveniently connected through the mounting holes in an installing mode.

Example two:

a second preferred embodiment of the inner mold expansion and contraction control structure for hollow prefabricated part production is shown in fig. 5 and 6, and is different from the first embodiment in that a guide rail 103 is provided on the connecting plate 101, and the guide rail 103 extends along the length direction of the core bar 1 by a predetermined length L. The sliding hinge assembly is rotatably connected with a sliding connection part 104, and the sliding connection part 104 is slidably connected with the guide rail 103. Similar to the embodiment, in the process that the core bar 1 is moved so that the sliding connection part 104 slides relative to the guide rail 103 by the predetermined length L, the guide rail 103 does not apply a pulling force or a pushing force to the sliding connection part 104, which can rotate the sliding hinge assembly; when the two ends of the guide rail 103 push against the sliding connection part 104, the sliding hinge assembly is stressed and rotates under the resultant force. Preferably, in order to ensure smooth sliding of the sliding connection portion 104 on the guide rail 103, a roller may be provided on the sliding connection portion 104.

In the first and second embodiments, the predetermined length L over which the slide hinge assembly is movable relative to the core bar 1 increases in order from one end to the other end along the length direction of the core bar 1. Taking fig. 1 as an example, from right to left, the length of the waist-shaped hinge hole 102 gradually increases, and the corresponding predetermined length L for relative movement of the sliding hinge components also increases in sequence. Similarly, in the second embodiment, the lengths of the guide rails are sequentially increased along the length direction of the core bar 1 as described above. In this case, as the core bar 1 moves rightward, the movable support plates 5 are folded in sequence from right to left, and in this case, the core mold can be released from the boundary, which is clearly more labor-saving than the release from the middle or the simultaneous release.

Example three:

as shown in fig. 3 and 4, in the third embodiment, on the basis of the first embodiment or the second embodiment, the inner mold expansion and contraction control structure for producing a hollow prefabricated part further comprises a driving mechanism, and the driving mechanism is used for driving the core rod 1 to move. The driving mechanism can be any common driving device which can push and pull an object, such as a cylinder or a pull rod.

Preferably, as shown in fig. 10 and 13, the driving mechanism includes a driving rotation shaft 31, and an external thread 311 is provided on an outer surface of the driving rotation shaft 31. Correspondingly, a threaded hole 312 is formed in one end of the core rod 1 in the length direction, and the driving rotating shaft 31 is in threaded connection with the threaded hole 312 in the core rod 1. When the driving rotating shaft 31 is screwed, the core bar 1 can be driven to move along the length direction according to the characteristics of thread transmission. The driving shaft 31 may be externally connected with a driving device, such as an air cylinder, for driving the driving shaft 31 to rotate. In this scheme, the structure of the driving mechanism is very simple and easy to realize. It should be noted that it should be ensured that the driving shaft 31 itself does not move in the axial direction during the driving process.

Example four:

as shown in fig. 3 and 4, in the fourth embodiment, on the basis of the first embodiment, the second embodiment or the third embodiment, a connecting seat 41 is further provided, one end of the connecting seat 41 is connected to the movable supporting plate 5, and the other end of the connecting seat 41 can be movably sleeved on the driving rotating shaft 31 as shown in fig. 3 or 4 or directly movably sleeved on the core rod 1.

Preferably, as shown in fig. 16, the connecting seat 41 is provided with a radial waist-shaped hole 410, the radial waist-shaped hole 410 is a long hole and has a size larger than that of the driving rotating shaft 31, and the radial waist-shaped hole 410 extends by a certain length in the movable direction of the movable supporting plate 5. The connecting base 41 can move outwards or inwards relative to the core bar 1, and the moving direction is the same as that of the corresponding connected movable supporting plate 5. When the connecting seat 41 moves to the upper end or the lower end of the radial waist-shaped hole 410 to abut against the driving rotating shaft 31 along one direction, the connecting seat 41 cannot move along the one direction any more, and at this time, the movable supporting plate 5 cannot move along the same direction under the limitation of the connecting seat 41. Therefore, the function of controlling the movement range of the core mold can be achieved by designing the radial kidney-shaped hole 410 of an appropriate length. Of course, any common structure for moving the connecting base 41 relative to the core rod 1, such as a guide rail, can be disposed on the connecting base 41, and is not illustrated here.

Still more preferably, on the basis of the third embodiment, in order to provide a support for the driving rotation shaft 31 and prevent the driving rotation shaft 31 from shaking, as shown in fig. 13 to 15, the driving rotation shaft 31 is connected to the connection seat 41 via a bearing 421. Preferably, a bearing mounting seat 42 is provided, the bearing 421 is mounted in the bearing mounting seat 42, one of the connecting seats 41 is a bearing mounting plate 411, the bearing mounting seat 42 is connected with the bearing mounting plate 411, and the middle part of the driving rotating shaft 31 is mounted in the bearing 421. In this solution, the bearing 421 plays a role of supporting the driving rotation shaft 31, and helps to keep the driving rotation shaft 31 moving smoothly. In view of bearing mounting plate 411 can be along with the motion of activity backup pad 5, be provided with the bearing in the bearing mount pad 42 and dodge position 422, at the in-process that bearing mount pad 42 moved along with bearing mounting plate 411, the bearing dodges position 422 and can provide the space of moving for bearing 421, prevents that bearing mount pad 42 and bearing 421 mutual interference from leading to the unable normal motion's of activity backup pad 5 problem to appear.

In a further embodiment, as shown in fig. 13, the outer surface of the driving shaft 31 is provided with a limiting protrusion 313, the limiting protrusion 313 is located on one side of the bearing 421 close to the core bar 1, and the bearing 421 abuts against the limiting protrusion 313 from the left side. Bearing mounting plate 411, bearing mount 42 and bearing 421 enclose jointly and enclose to keep off and connect chamber 420, and spacing arch 313 is installed in keeping off and connect chamber 420 for the both sides of spacing arch 313 are respectively by bearing 421 and connecting seat 41 butt, thereby make drive shaft 31 can not follow self axial displacement.

If the connecting base 41 is directly sleeved on the core bar 1, the connecting base 41 can also play a role of supporting the core bar 1.

Preferably, a support rod 32 is further connected to one end of the core rod 1 facing away from the driving rotating shaft 31, and the support rod 32 is also sleeved with the connecting seat 41. The advantage of this design is that the support function that connecting seat 41 provided can keep the hollow prefabricated component production with interior mould breathing control structure both ends balanced.

Example five:

as shown in fig. 10, this embodiment also provides a core mold including the above-described inner mold expansion and contraction control structure for hollow prefabricated member production. As shown in fig. 8, the movable supporting plate 5 is an elastic hard die 6, and the elastic hard die 6 completely surrounds the core rod 1 along the circumferential direction. The elastic hard mold 6 has a certain hardness in a length direction to prevent deformation by pressure of concrete slurry during use, and the elastic hard mold 6 can expand or contract in a circumferential direction by a pushing force or a pulling force of the hinge assembly 2. The elastic die 6 may be made of a material having both hard and elastic properties. When the hinge assembly 2 rotates, the elastic hard die 6 moves along with the hinge assembly 2, and the elastic hard die 6 expands or contracts.

The elastic die 6 serves on the one hand to support the shaping of the hollow hole in the prefabricated part and on the other hand to prevent the penetration of the slurry into the interior of the core. It should be noted in particular that the elastic die 6 is designed to be able to undergo a slight bending deformation after being subjected to the pulling force of the hinge assembly 2, so as to achieve a partial demolding.

Example six:

the sixth embodiment is similar to the fifth embodiment in structure, except that the movable supporting plate 5 has a different specific structure. As shown in fig. 9, the movable support plates 5 surround the core bar 1 at intervals in the circumferential direction. The hinge assembly 2 may urge the movable support plates 5 toward or away from the core rod 1 in different directions. The movable supporting plate 5 is externally sleeved with an elastic die sleeve 61, and when the movable supporting plate 5 moves, the elastic die sleeve 61 is driven to expand or contract.

Example seven:

the core mold provided in the fifth or sixth embodiment may be formed into a mold together with an outer mold, the core mold being installed in a cavity of the outer mold, the outer mold having a structure determined according to the shape of the prefabricated part to be produced, and concrete does not enter the core mold during production, thereby producing a hollow prefabricated part. The specific structure of the outer mold belongs to the prior art, and is not described in detail herein.

Each embodiment provided by the scheme is helpful for reducing the driving force required by the core mould demoulding.

In summary, the present invention is only a preferred embodiment, and should not be limited to the above embodiments, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. Hollow prefabricated component production is with centre form breathing control structure, its characterized in that includes: the device comprises a core rod (1) and more than two movable supporting plates (5) which circumferentially surround the core rod (1);

wherein the core bar (1) can reciprocate along the length direction of the hollow prefabricated component; the movable supporting plate (5) is arranged along the length direction of the hollow prefabricated part in an extending mode and is connected to the core rod (1) through a plurality of hinge assemblies (2) arranged at intervals, and the hinge assemblies (2) are respectively connected with the core rod (1) and the movable supporting plate (5) in a rotating mode;

at least part of the hinge assemblies (2) arranged on the same movable support plate (5) are sliding hinge assemblies, and at least one of the movable support plate (5) and the core rod (1) can slide relative to the sliding hinge assemblies for a preset length along the length direction of the hollow prefabricated part.

2. The inner die swell-shrink control structure for hollow prefabricated parts according to claim 1, wherein the slidable distance of each sliding hinge assembly increases sequentially in the length direction from one end of the core rod (1) to the other end thereof.

3. The inner mold expansion and contraction control structure for hollow prefabricated part production according to claim 2, wherein the hinge assembly (2) comprises a hinge rod (21), and both ends of the hinge rod (21) are rotatably connected with the movable support plate (5) and the core rod (1), respectively;

for the sliding hinge assembly, at least one of the movable support plate (5) and the core bar (1) is provided with a waist-shaped hinge hole (102) which extends for a preset length along the length direction of the core bar (1), and the hinge rod (21) is connected with the waist-shaped hinge hole (102) in a sliding manner; or, for the sliding hinge assembly, at least one of the movable supporting plate (5) and the core bar (1) is provided with a guide rail (103) which extends for a preset length along the length direction of the core bar (1), and the hinge rod (21) is connected with the guide rail (103) in a sliding way.

4. The internal mold expansion and contraction control structure for hollow prefabricated part production according to claim 3, wherein a torsion spring (23) is provided between the hinge rod (21) and the core bar (1) and/or between the hinge rod (21) and the movable support plate (5).

5. The internal mold expansion and contraction control structure for hollow prefabricated parts production according to claim 1, wherein said movable support plate (5) is provided with a plurality of mounting holes at intervals along the length direction, and said movable support plate (5) is provided with a detachable cover (71) on said mounting holes;

and/or a plurality of reinforcing rib plates (11) are arranged on one side, facing the core bar (1), of the movable supporting plate (5) at intervals.

6. The internal mold expansion and contraction control structure for the production of a hollow prefabricated part according to any one of claims 1 to 5, further comprising a driving rotating shaft (31) screwed to one end of the core bar (1) in the length direction, wherein the driving rotating shaft (31) is used for externally connecting a driving device and driving the core bar (1) to reciprocate in the length direction of the hollow prefabricated part.

7. The internal mold expansion and contraction control structure for producing hollow prefabricated parts according to claim 6, wherein the movable support plate (5) is provided with a connecting seat (41), the connecting seat (41) is provided with a through hole for the driving rotating shaft (31) or the core rod (1) to penetrate through, and the through hole is a radial waist-shaped hole (410).

8. The internal mold expansion and contraction control structure for producing hollow prefabricated parts according to claim 7, wherein the driving rotation shaft (31) is rotatably connected to the connecting seat (41) via a bearing (421); the outer surface of the driving rotating shaft (31) is provided with a limiting protrusion (313), and the limiting protrusion (313) is abutted between the bearing (421) and the connecting seat (41);

and/or one end part of the core rod (1) back to the driving rotating shaft (31) in the length direction is connected with a support rod (32), and the connecting seat (41) is sleeved outside the support rod (32).

9. A core mold comprising an inner mold expansion and contraction control structure for hollow prefabricated part production according to any one of claims 1 to 8, wherein said movable support plate (5) is an elastic die (6), and said elastic die (6) surrounds said core rod (1);

or, the hollow prefabricated component production inner die expansion and contraction control structure comprises the hollow prefabricated component production inner die expansion and contraction control structure and the elastic die sleeve (61) according to any one of claims 1 to 8, wherein the elastic die sleeve (61) is sleeved outside the movable supporting plate (5).

10. A mold comprising an outer mold and a core mold according to claim 9, the core mold being mounted within a cavity of the outer mold.

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